1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
4 2010, 2011 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* This file handles generation of all the assembler code
24 *except* the instructions of a function.
25 This includes declarations of variables and their initial values.
27 We also output the assembler code for constants stored in memory
28 and are responsible for combining constants with the same value. */
32 #include "coretypes.h"
39 #include "hard-reg-set.h"
42 #include "diagnostic-core.h"
45 #include "langhooks.h"
49 #include "common/common-target.h"
50 #include "targhooks.h"
51 #include "tree-mudflap.h"
53 #include "cfglayout.h"
54 #include "basic-block.h"
55 #include "tree-iterator.h"
56 #include "pointer-set.h"
58 #ifdef XCOFF_DEBUGGING_INFO
59 #include "xcoffout.h" /* Needed for external data
60 declarations for e.g. AIX 4.x. */
63 /* The (assembler) name of the first globally-visible object output. */
64 extern GTY(()) const char *first_global_object_name;
65 extern GTY(()) const char *weak_global_object_name;
67 const char *first_global_object_name;
68 const char *weak_global_object_name;
71 struct constant_descriptor_rtx;
72 struct rtx_constant_pool;
74 #define n_deferred_constants (crtl->varasm.deferred_constants)
76 /* Number for making the label on the next
77 constant that is stored in memory. */
79 static GTY(()) int const_labelno;
81 /* Carry information from ASM_DECLARE_OBJECT_NAME
82 to ASM_FINISH_DECLARE_OBJECT. */
84 int size_directive_output;
86 /* The last decl for which assemble_variable was called,
87 if it did ASM_DECLARE_OBJECT_NAME.
88 If the last call to assemble_variable didn't do that,
91 tree last_assemble_variable_decl;
93 /* The following global variable indicates if the first basic block
94 in a function belongs to the cold partition or not. */
96 bool first_function_block_is_cold;
98 /* We give all constants their own alias set. Perhaps redundant with
99 MEM_READONLY_P, but pre-dates it. */
101 static alias_set_type const_alias_set;
103 /* Whether we saw any functions with no_split_stack. */
105 static bool saw_no_split_stack;
107 static const char *strip_reg_name (const char *);
108 static int contains_pointers_p (tree);
109 #ifdef ASM_OUTPUT_EXTERNAL
110 static bool incorporeal_function_p (tree);
112 static void decode_addr_const (tree, struct addr_const *);
113 static hashval_t const_desc_hash (const void *);
114 static int const_desc_eq (const void *, const void *);
115 static hashval_t const_hash_1 (const tree);
116 static int compare_constant (const tree, const tree);
117 static tree copy_constant (tree);
118 static void output_constant_def_contents (rtx);
119 static void output_addressed_constants (tree);
120 static unsigned HOST_WIDE_INT array_size_for_constructor (tree);
121 static unsigned min_align (unsigned, unsigned);
122 static void globalize_decl (tree);
123 static bool decl_readonly_section_1 (enum section_category);
124 #ifdef BSS_SECTION_ASM_OP
125 #ifdef ASM_OUTPUT_ALIGNED_BSS
126 static void asm_output_aligned_bss (FILE *, tree, const char *,
127 unsigned HOST_WIDE_INT, int)
130 #endif /* BSS_SECTION_ASM_OP */
131 static void mark_weak (tree);
132 static void output_constant_pool (const char *, tree);
134 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
135 section *text_section;
136 section *data_section;
137 section *readonly_data_section;
138 section *sdata_section;
139 section *ctors_section;
140 section *dtors_section;
141 section *bss_section;
142 section *sbss_section;
144 /* Various forms of common section. All are guaranteed to be nonnull. */
145 section *tls_comm_section;
146 section *comm_section;
147 section *lcomm_section;
149 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
151 section *bss_noswitch_section;
153 /* The section that holds the main exception table, when known. The section
154 is set either by the target's init_sections hook or by the first call to
155 switch_to_exception_section. */
156 section *exception_section;
158 /* The section that holds the DWARF2 frame unwind information, when known.
159 The section is set either by the target's init_sections hook or by the
160 first call to switch_to_eh_frame_section. */
161 section *eh_frame_section;
163 /* asm_out_file's current section. This is NULL if no section has yet
164 been selected or if we lose track of what the current section is. */
167 /* True if code for the current function is currently being directed
168 at the cold section. */
169 bool in_cold_section_p;
171 /* A linked list of all the unnamed sections. */
172 static GTY(()) section *unnamed_sections;
174 /* Return a nonzero value if DECL has a section attribute. */
175 #define IN_NAMED_SECTION(DECL) \
176 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
177 && DECL_SECTION_NAME (DECL) != NULL_TREE)
179 /* Hash table of named sections. */
180 static GTY((param_is (section))) htab_t section_htab;
182 /* A table of object_blocks, indexed by section. */
183 static GTY((param_is (struct object_block))) htab_t object_block_htab;
185 /* The next number to use for internal anchor labels. */
186 static GTY(()) int anchor_labelno;
188 /* A pool of constants that can be shared between functions. */
189 static GTY(()) struct rtx_constant_pool *shared_constant_pool;
191 /* Helper routines for maintaining section_htab. */
194 section_entry_eq (const void *p1, const void *p2)
196 const section *old = (const section *) p1;
197 const char *new_name = (const char *) p2;
199 return strcmp (old->named.name, new_name) == 0;
203 section_entry_hash (const void *p)
205 const section *old = (const section *) p;
206 return htab_hash_string (old->named.name);
209 /* Return a hash value for section SECT. */
212 hash_section (section *sect)
214 if (sect->common.flags & SECTION_NAMED)
215 return htab_hash_string (sect->named.name);
216 return sect->common.flags;
219 /* Helper routines for maintaining object_block_htab. */
222 object_block_entry_eq (const void *p1, const void *p2)
224 const struct object_block *old = (const struct object_block *) p1;
225 const section *new_section = (const section *) p2;
227 return old->sect == new_section;
231 object_block_entry_hash (const void *p)
233 const struct object_block *old = (const struct object_block *) p;
234 return hash_section (old->sect);
237 /* Return a new unnamed section with the given fields. */
240 get_unnamed_section (unsigned int flags, void (*callback) (const void *),
245 sect = ggc_alloc_section ();
246 sect->unnamed.common.flags = flags | SECTION_UNNAMED;
247 sect->unnamed.callback = callback;
248 sect->unnamed.data = data;
249 sect->unnamed.next = unnamed_sections;
251 unnamed_sections = sect;
255 /* Return a SECTION_NOSWITCH section with the given fields. */
258 get_noswitch_section (unsigned int flags, noswitch_section_callback callback)
262 sect = ggc_alloc_section ();
263 sect->noswitch.common.flags = flags | SECTION_NOSWITCH;
264 sect->noswitch.callback = callback;
269 /* Return the named section structure associated with NAME. Create
270 a new section with the given fields if no such structure exists. */
273 get_section (const char *name, unsigned int flags, tree decl)
275 section *sect, **slot;
278 htab_find_slot_with_hash (section_htab, name,
279 htab_hash_string (name), INSERT);
280 flags |= SECTION_NAMED;
283 sect = ggc_alloc_section ();
284 sect->named.common.flags = flags;
285 sect->named.name = ggc_strdup (name);
286 sect->named.decl = decl;
292 if ((sect->common.flags & ~SECTION_DECLARED) != flags
293 && ((sect->common.flags | flags) & SECTION_OVERRIDE) == 0)
295 /* It is fine if one of the section flags is
296 SECTION_WRITE | SECTION_RELRO and the other has none of these
297 flags (i.e. read-only) in named sections and either the
298 section hasn't been declared yet or has been declared as writable.
299 In that case just make sure the resulting flags are
300 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
302 if (((sect->common.flags ^ flags) & (SECTION_WRITE | SECTION_RELRO))
303 == (SECTION_WRITE | SECTION_RELRO)
304 && (sect->common.flags
305 & ~(SECTION_DECLARED | SECTION_WRITE | SECTION_RELRO))
306 == (flags & ~(SECTION_WRITE | SECTION_RELRO))
307 && ((sect->common.flags & SECTION_DECLARED) == 0
308 || (sect->common.flags & SECTION_WRITE)))
310 sect->common.flags |= (SECTION_WRITE | SECTION_RELRO);
313 /* Sanity check user variables for flag changes. */
315 decl = sect->named.decl;
317 error ("%+D causes a section type conflict with %D",
318 decl, sect->named.decl);
319 if (decl != sect->named.decl)
320 inform (DECL_SOURCE_LOCATION (sect->named.decl),
321 "%qD was declared here", sect->named.decl);
322 /* Make sure we don't error about one section multiple times. */
323 sect->common.flags |= SECTION_OVERRIDE;
329 /* Return true if the current compilation mode benefits from having
330 objects grouped into blocks. */
333 use_object_blocks_p (void)
335 return flag_section_anchors;
338 /* Return the object_block structure for section SECT. Create a new
339 structure if we haven't created one already. Return null if SECT
342 static struct object_block *
343 get_block_for_section (section *sect)
345 struct object_block *block;
351 slot = htab_find_slot_with_hash (object_block_htab, sect,
352 hash_section (sect), INSERT);
353 block = (struct object_block *) *slot;
356 block = ggc_alloc_cleared_object_block ();
363 /* Create a symbol with label LABEL and place it at byte offset
364 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
365 is not yet known. LABEL must be a garbage-collected string. */
368 create_block_symbol (const char *label, struct object_block *block,
369 HOST_WIDE_INT offset)
374 /* Create the extended SYMBOL_REF. */
375 size = RTX_HDR_SIZE + sizeof (struct block_symbol);
376 symbol = ggc_alloc_zone_rtx_def (size, &rtl_zone);
378 /* Initialize the normal SYMBOL_REF fields. */
379 memset (symbol, 0, size);
380 PUT_CODE (symbol, SYMBOL_REF);
381 PUT_MODE (symbol, Pmode);
382 XSTR (symbol, 0) = label;
383 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_HAS_BLOCK_INFO;
385 /* Initialize the block_symbol stuff. */
386 SYMBOL_REF_BLOCK (symbol) = block;
387 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
392 /* Return a section with a particular name and with whatever SECTION_*
393 flags section_type_flags deems appropriate. The name of the section
394 is taken from NAME if nonnull, otherwise it is taken from DECL's
395 DECL_SECTION_NAME. DECL is the decl associated with the section
396 (see the section comment for details) and RELOC is as for
397 section_type_flags. */
400 get_named_section (tree decl, const char *name, int reloc)
404 gcc_assert (!decl || DECL_P (decl));
406 name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
408 flags = targetm.section_type_flags (decl, name, reloc);
410 return get_section (name, flags, decl);
413 /* If required, set DECL_SECTION_NAME to a unique name. */
416 resolve_unique_section (tree decl, int reloc ATTRIBUTE_UNUSED,
417 int flag_function_or_data_sections)
419 if (DECL_SECTION_NAME (decl) == NULL_TREE
420 && targetm_common.have_named_sections
421 && (flag_function_or_data_sections
422 || DECL_ONE_ONLY (decl)))
424 targetm.asm_out.unique_section (decl, reloc);
425 DECL_HAS_IMPLICIT_SECTION_NAME_P (decl) = true;
429 #ifdef BSS_SECTION_ASM_OP
431 #ifdef ASM_OUTPUT_ALIGNED_BSS
433 /* Utility function for targets to use in implementing
434 ASM_OUTPUT_ALIGNED_BSS.
435 ??? It is believed that this function will work in most cases so such
436 support is localized here. */
439 asm_output_aligned_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
440 const char *name, unsigned HOST_WIDE_INT size,
443 switch_to_section (bss_section);
444 ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
445 #ifdef ASM_DECLARE_OBJECT_NAME
446 last_assemble_variable_decl = decl;
447 ASM_DECLARE_OBJECT_NAME (file, name, decl);
449 /* Standard thing is just output label for the object. */
450 ASM_OUTPUT_LABEL (file, name);
451 #endif /* ASM_DECLARE_OBJECT_NAME */
452 ASM_OUTPUT_SKIP (file, size ? size : 1);
457 #endif /* BSS_SECTION_ASM_OP */
459 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
460 /* Return the hot section for function DECL. Return text_section for
464 hot_function_section (tree decl)
466 if (decl != NULL_TREE
467 && DECL_SECTION_NAME (decl) != NULL_TREE
468 && targetm_common.have_named_sections)
469 return get_named_section (decl, NULL, 0);
475 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
478 When DECL_SECTION_NAME is non-NULL and it is implicit section and
479 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
480 concatenate the name with NAMED_SECTION_SUFFIX.
481 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
484 get_named_text_section (tree decl,
485 const char *text_section_name,
486 const char *named_section_suffix)
488 if (decl && DECL_SECTION_NAME (decl))
490 if (named_section_suffix)
492 tree dsn = DECL_SECTION_NAME (decl);
493 const char *stripped_name;
496 name = (char *) alloca (TREE_STRING_LENGTH (dsn) + 1);
497 memcpy (name, TREE_STRING_POINTER (dsn),
498 TREE_STRING_LENGTH (dsn) + 1);
500 stripped_name = targetm.strip_name_encoding (name);
502 buffer = ACONCAT ((stripped_name, named_section_suffix, NULL));
503 return get_named_section (decl, buffer, 0);
505 else if (DECL_HAS_IMPLICIT_SECTION_NAME_P (decl))
509 /* Do not try to split gnu_linkonce functions. This gets somewhat
511 if (DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP)
513 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
514 name = targetm.strip_name_encoding (name);
515 return get_named_section (decl, ACONCAT ((text_section_name, ".",
521 return get_named_section (decl, text_section_name, 0);
524 /* Choose named function section based on its frequency. */
527 default_function_section (tree decl, enum node_frequency freq,
528 bool startup, bool exit)
530 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
531 /* Old GNU linkers have buggy --gc-section support, which sometimes
532 results in .gcc_except_table* sections being garbage collected. */
534 && DECL_SECTION_NAME (decl)
535 && DECL_HAS_IMPLICIT_SECTION_NAME_P (decl))
539 if (!flag_reorder_functions
540 || !targetm_common.have_named_sections)
542 /* Startup code should go to startup subsection unless it is
543 unlikely executed (this happens especially with function splitting
544 where we can split away unnecesary parts of static constructors. */
545 if (startup && freq != NODE_FREQUENCY_UNLIKELY_EXECUTED)
546 return get_named_text_section (decl, ".text.startup", NULL);
548 /* Similarly for exit. */
549 if (exit && freq != NODE_FREQUENCY_UNLIKELY_EXECUTED)
550 return get_named_text_section (decl, ".text.exit", NULL);
552 /* Group cold functions together, similarly for hot code. */
555 case NODE_FREQUENCY_UNLIKELY_EXECUTED:
556 return get_named_text_section (decl, ".text.unlikely", NULL);
557 case NODE_FREQUENCY_HOT:
558 return get_named_text_section (decl, ".text.hot", NULL);
564 /* Return the section for function DECL.
566 If DECL is NULL_TREE, return the text section. We can be passed
567 NULL_TREE under some circumstances by dbxout.c at least.
569 If FORCE_COLD is true, return cold function section ignoring
570 the frequency info of cgraph_node. */
573 function_section_1 (tree decl, bool force_cold)
575 section *section = NULL;
576 enum node_frequency freq = NODE_FREQUENCY_NORMAL;
577 bool startup = false, exit = false;
581 struct cgraph_node *node = cgraph_get_node (decl);
585 freq = node->frequency;
586 startup = node->only_called_at_startup;
587 exit = node->only_called_at_exit;
591 freq = NODE_FREQUENCY_UNLIKELY_EXECUTED;
593 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
594 if (decl != NULL_TREE
595 && DECL_SECTION_NAME (decl) != NULL_TREE)
597 if (targetm.asm_out.function_section)
598 section = targetm.asm_out.function_section (decl, freq,
602 return get_named_section (decl, NULL, 0);
605 return targetm.asm_out.select_section
606 (decl, freq == NODE_FREQUENCY_UNLIKELY_EXECUTED,
609 if (targetm.asm_out.function_section)
610 section = targetm.asm_out.function_section (decl, freq, startup, exit);
613 return hot_function_section (decl);
617 /* Return the section for function DECL.
619 If DECL is NULL_TREE, return the text section. We can be passed
620 NULL_TREE under some circumstances by dbxout.c at least. */
623 function_section (tree decl)
625 /* Handle cases where function splitting code decides
626 to put function entry point into unlikely executed section
627 despite the fact that the function itself is not cold
628 (i.e. it is called rarely but contains a hot loop that is
629 better to live in hot subsection for the code locality). */
630 return function_section_1 (decl,
631 first_function_block_is_cold);
634 /* Return the section for the current function, take IN_COLD_SECTION_P
638 current_function_section (void)
640 return function_section_1 (current_function_decl, in_cold_section_p);
643 /* Tell assembler to switch to unlikely-to-be-executed text section. */
646 unlikely_text_section (void)
648 return function_section_1 (current_function_decl, true);
651 /* When called within a function context, return true if the function
652 has been assigned a cold text section and if SECT is that section.
653 When called outside a function context, return true if SECT is the
654 default cold section. */
657 unlikely_text_section_p (section *sect)
659 return sect == function_section_1 (current_function_decl, true);
662 /* Return the read-only data section associated with function DECL. */
665 default_function_rodata_section (tree decl)
667 if (decl != NULL_TREE && DECL_SECTION_NAME (decl))
669 const char *name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
671 if (DECL_ONE_ONLY (decl) && HAVE_COMDAT_GROUP)
677 dot = strchr (name + 1, '.');
680 len = strlen (dot) + 8;
681 rname = (char *) alloca (len);
683 strcpy (rname, ".rodata");
685 return get_section (rname, SECTION_LINKONCE, decl);
687 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
688 else if (DECL_ONE_ONLY (decl)
689 && strncmp (name, ".gnu.linkonce.t.", 16) == 0)
691 size_t len = strlen (name) + 1;
692 char *rname = (char *) alloca (len);
694 memcpy (rname, name, len);
696 return get_section (rname, SECTION_LINKONCE, decl);
698 /* For .text.foo we want to use .rodata.foo. */
699 else if (flag_function_sections && flag_data_sections
700 && strncmp (name, ".text.", 6) == 0)
702 size_t len = strlen (name) + 1;
703 char *rname = (char *) alloca (len + 2);
705 memcpy (rname, ".rodata", 7);
706 memcpy (rname + 7, name + 5, len - 5);
707 return get_section (rname, 0, decl);
711 return readonly_data_section;
714 /* Return the read-only data section associated with function DECL
715 for targets where that section should be always the single
716 readonly data section. */
719 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED)
721 return readonly_data_section;
724 /* Return the section to use for string merging. */
727 mergeable_string_section (tree decl ATTRIBUTE_UNUSED,
728 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
729 unsigned int flags ATTRIBUTE_UNUSED)
733 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
734 && TREE_CODE (decl) == STRING_CST
735 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
737 && (len = int_size_in_bytes (TREE_TYPE (decl))) > 0
738 && TREE_STRING_LENGTH (decl) >= len)
740 enum machine_mode mode;
741 unsigned int modesize;
745 const char *prefix = targetm.asm_out.mergeable_rodata_prefix;
746 char *name = (char *) alloca (strlen (prefix) + 30);
748 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (decl)));
749 modesize = GET_MODE_BITSIZE (mode);
750 if (modesize >= 8 && modesize <= 256
751 && (modesize & (modesize - 1)) == 0)
753 if (align < modesize)
756 str = TREE_STRING_POINTER (decl);
757 unit = GET_MODE_SIZE (mode);
759 /* Check for embedded NUL characters. */
760 for (i = 0; i < len; i += unit)
762 for (j = 0; j < unit; j++)
763 if (str[i + j] != '\0')
770 sprintf (name, "%s.str%d.%d", prefix,
771 modesize / 8, (int) (align / 8));
772 flags |= (modesize / 8) | SECTION_MERGE | SECTION_STRINGS;
773 return get_section (name, flags, NULL);
778 return readonly_data_section;
781 /* Return the section to use for constant merging. */
784 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED,
785 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
786 unsigned int flags ATTRIBUTE_UNUSED)
788 unsigned int modesize = GET_MODE_BITSIZE (mode);
790 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
796 && (align & (align - 1)) == 0)
798 const char *prefix = targetm.asm_out.mergeable_rodata_prefix;
799 char *name = (char *) alloca (strlen (prefix) + 30);
801 sprintf (name, "%s.cst%d", prefix, (int) (align / 8));
802 flags |= (align / 8) | SECTION_MERGE;
803 return get_section (name, flags, NULL);
805 return readonly_data_section;
808 /* Given NAME, a putative register name, discard any customary prefixes. */
811 strip_reg_name (const char *name)
813 #ifdef REGISTER_PREFIX
814 if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
815 name += strlen (REGISTER_PREFIX);
817 if (name[0] == '%' || name[0] == '#')
822 /* The user has asked for a DECL to have a particular name. Set (or
823 change) it in such a way that we don't prefix an underscore to
826 set_user_assembler_name (tree decl, const char *name)
828 char *starred = (char *) alloca (strlen (name) + 2);
830 strcpy (starred + 1, name);
831 change_decl_assembler_name (decl, get_identifier (starred));
832 SET_DECL_RTL (decl, NULL_RTX);
835 /* Decode an `asm' spec for a declaration as a register name.
836 Return the register number, or -1 if nothing specified,
837 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
838 or -3 if ASMSPEC is `cc' and is not recognized,
839 or -4 if ASMSPEC is `memory' and is not recognized.
840 Accept an exact spelling or a decimal number.
841 Prefixes such as % are optional. */
844 decode_reg_name_and_count (const char *asmspec, int *pnregs)
846 /* Presume just one register is clobbered. */
853 /* Get rid of confusing prefixes. */
854 asmspec = strip_reg_name (asmspec);
856 /* Allow a decimal number as a "register name". */
857 for (i = strlen (asmspec) - 1; i >= 0; i--)
858 if (! ISDIGIT (asmspec[i]))
860 if (asmspec[0] != 0 && i < 0)
863 if (i < FIRST_PSEUDO_REGISTER && i >= 0)
869 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
871 && ! strcmp (asmspec, strip_reg_name (reg_names[i])))
874 #ifdef OVERLAPPING_REGISTER_NAMES
878 const char *const name;
881 } table[] = OVERLAPPING_REGISTER_NAMES;
883 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
885 && ! strcmp (asmspec, table[i].name))
887 *pnregs = table[i].nregs;
888 return table[i].number;
891 #endif /* OVERLAPPING_REGISTER_NAMES */
893 #ifdef ADDITIONAL_REGISTER_NAMES
895 static const struct { const char *const name; const int number; } table[]
896 = ADDITIONAL_REGISTER_NAMES;
898 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
900 && ! strcmp (asmspec, table[i].name))
901 return table[i].number;
903 #endif /* ADDITIONAL_REGISTER_NAMES */
905 if (!strcmp (asmspec, "memory"))
908 if (!strcmp (asmspec, "cc"))
918 decode_reg_name (const char *name)
921 return decode_reg_name_and_count (name, &count);
925 /* Return true if DECL's initializer is suitable for a BSS section. */
928 bss_initializer_p (const_tree decl)
930 return (DECL_INITIAL (decl) == NULL
931 || DECL_INITIAL (decl) == error_mark_node
932 || (flag_zero_initialized_in_bss
933 /* Leave constant zeroes in .rodata so they
935 && !TREE_READONLY (decl)
936 && initializer_zerop (DECL_INITIAL (decl))));
939 /* Compute the alignment of variable specified by DECL.
940 DONT_OUTPUT_DATA is from assemble_variable. */
943 align_variable (tree decl, bool dont_output_data)
945 unsigned int align = DECL_ALIGN (decl);
947 /* In the case for initialing an array whose length isn't specified,
948 where we have not yet been able to do the layout,
949 figure out the proper alignment now. */
950 if (dont_output_data && DECL_SIZE (decl) == 0
951 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
952 align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
954 /* Some object file formats have a maximum alignment which they support.
955 In particular, a.out format supports a maximum alignment of 4. */
956 if (align > MAX_OFILE_ALIGNMENT)
958 warning (0, "alignment of %q+D is greater than maximum object "
959 "file alignment. Using %d", decl,
960 MAX_OFILE_ALIGNMENT/BITS_PER_UNIT);
961 align = MAX_OFILE_ALIGNMENT;
964 /* On some machines, it is good to increase alignment sometimes. */
965 if (! DECL_USER_ALIGN (decl))
967 #ifdef DATA_ALIGNMENT
968 unsigned int data_align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
969 /* Don't increase alignment too much for TLS variables - TLS space
971 if (! DECL_THREAD_LOCAL_P (decl) || data_align <= BITS_PER_WORD)
974 #ifdef CONSTANT_ALIGNMENT
975 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
977 unsigned int const_align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl),
979 /* Don't increase alignment too much for TLS variables - TLS space
981 if (! DECL_THREAD_LOCAL_P (decl) || const_align <= BITS_PER_WORD)
987 /* Reset the alignment in case we have made it tighter, so we can benefit
988 from it in get_pointer_alignment. */
989 DECL_ALIGN (decl) = align;
992 /* Return the section into which the given VAR_DECL or CONST_DECL
993 should be placed. PREFER_NOSWITCH_P is true if a noswitch
994 section should be used wherever possible. */
997 get_variable_section (tree decl, bool prefer_noswitch_p)
999 addr_space_t as = ADDR_SPACE_GENERIC;
1002 if (TREE_TYPE (decl) != error_mark_node)
1003 as = TYPE_ADDR_SPACE (TREE_TYPE (decl));
1005 if (DECL_COMMON (decl))
1007 /* If the decl has been given an explicit section name, or it resides
1008 in a non-generic address space, then it isn't common, and shouldn't
1009 be handled as such. */
1010 gcc_assert (DECL_SECTION_NAME (decl) == NULL
1011 && ADDR_SPACE_GENERIC_P (as));
1012 if (DECL_THREAD_LOCAL_P (decl))
1013 return tls_comm_section;
1014 else if (TREE_PUBLIC (decl) && bss_initializer_p (decl))
1015 return comm_section;
1018 if (DECL_INITIAL (decl) == error_mark_node)
1019 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
1020 else if (DECL_INITIAL (decl))
1021 reloc = compute_reloc_for_constant (DECL_INITIAL (decl));
1025 resolve_unique_section (decl, reloc, flag_data_sections);
1026 if (IN_NAMED_SECTION (decl))
1027 return get_named_section (decl, NULL, reloc);
1029 if (ADDR_SPACE_GENERIC_P (as)
1030 && !DECL_THREAD_LOCAL_P (decl)
1031 && !(prefer_noswitch_p && targetm.have_switchable_bss_sections)
1032 && bss_initializer_p (decl))
1034 if (!TREE_PUBLIC (decl))
1035 return lcomm_section;
1036 if (bss_noswitch_section)
1037 return bss_noswitch_section;
1040 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
1043 /* Return the block into which object_block DECL should be placed. */
1045 static struct object_block *
1046 get_block_for_decl (tree decl)
1050 if (TREE_CODE (decl) == VAR_DECL)
1052 /* The object must be defined in this translation unit. */
1053 if (DECL_EXTERNAL (decl))
1056 /* There's no point using object blocks for something that is
1057 isolated by definition. */
1058 if (DECL_ONE_ONLY (decl))
1062 /* We can only calculate block offsets if the decl has a known
1064 if (DECL_SIZE_UNIT (decl) == NULL)
1066 if (!host_integerp (DECL_SIZE_UNIT (decl), 1))
1069 /* Find out which section should contain DECL. We cannot put it into
1070 an object block if it requires a standalone definition. */
1071 if (TREE_CODE (decl) == VAR_DECL)
1072 align_variable (decl, 0);
1073 sect = get_variable_section (decl, true);
1074 if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
1077 return get_block_for_section (sect);
1080 /* Make sure block symbol SYMBOL is in block BLOCK. */
1083 change_symbol_block (rtx symbol, struct object_block *block)
1085 if (block != SYMBOL_REF_BLOCK (symbol))
1087 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol) < 0);
1088 SYMBOL_REF_BLOCK (symbol) = block;
1092 /* Return true if it is possible to put DECL in an object_block. */
1095 use_blocks_for_decl_p (tree decl)
1097 /* Only data DECLs can be placed into object blocks. */
1098 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != CONST_DECL)
1101 /* Detect decls created by dw2_force_const_mem. Such decls are
1102 special because DECL_INITIAL doesn't specify the decl's true value.
1103 dw2_output_indirect_constants will instead call assemble_variable
1104 with dont_output_data set to 1 and then print the contents itself. */
1105 if (DECL_INITIAL (decl) == decl)
1108 /* If this decl is an alias, then we don't want to emit a
1110 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl)))
1116 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1117 have static storage duration. In other words, it should not be an
1118 automatic variable, including PARM_DECLs.
1120 There is, however, one exception: this function handles variables
1121 explicitly placed in a particular register by the user.
1123 This is never called for PARM_DECL nodes. */
1126 make_decl_rtl (tree decl)
1128 const char *name = 0;
1132 /* Check that we are not being given an automatic variable. */
1133 gcc_assert (TREE_CODE (decl) != PARM_DECL
1134 && TREE_CODE (decl) != RESULT_DECL);
1136 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1137 gcc_assert (TREE_CODE (decl) != VAR_DECL
1138 || TREE_STATIC (decl)
1139 || TREE_PUBLIC (decl)
1140 || DECL_EXTERNAL (decl)
1141 || DECL_REGISTER (decl));
1143 /* And that we were not given a type or a label. */
1144 gcc_assert (TREE_CODE (decl) != TYPE_DECL
1145 && TREE_CODE (decl) != LABEL_DECL);
1147 /* For a duplicate declaration, we can be called twice on the
1148 same DECL node. Don't discard the RTL already made. */
1149 if (DECL_RTL_SET_P (decl))
1151 /* If the old RTL had the wrong mode, fix the mode. */
1152 x = DECL_RTL (decl);
1153 if (GET_MODE (x) != DECL_MODE (decl))
1154 SET_DECL_RTL (decl, adjust_address_nv (x, DECL_MODE (decl), 0));
1156 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1159 /* ??? Another way to do this would be to maintain a hashed
1160 table of such critters. Instead of adding stuff to a DECL
1161 to give certain attributes to it, we could use an external
1162 hash map from DECL to set of attributes. */
1164 /* Let the target reassign the RTL if it wants.
1165 This is necessary, for example, when one machine specific
1166 decl attribute overrides another. */
1167 targetm.encode_section_info (decl, DECL_RTL (decl), false);
1169 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1170 on the new decl information. */
1172 && GET_CODE (XEXP (x, 0)) == SYMBOL_REF
1173 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x, 0)))
1174 change_symbol_block (XEXP (x, 0), get_block_for_decl (decl));
1176 /* Make this function static known to the mudflap runtime. */
1177 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1178 mudflap_enqueue_decl (decl);
1183 /* If this variable belongs to the global constant pool, retrieve the
1184 pre-computed RTL or recompute it in LTO mode. */
1185 if (TREE_CODE (decl) == VAR_DECL && DECL_IN_CONSTANT_POOL (decl))
1187 SET_DECL_RTL (decl, output_constant_def (DECL_INITIAL (decl), 1));
1191 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1193 if (name[0] != '*' && TREE_CODE (decl) != FUNCTION_DECL
1194 && DECL_REGISTER (decl))
1196 error ("register name not specified for %q+D", decl);
1198 else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1200 const char *asmspec = name+1;
1201 reg_number = decode_reg_name (asmspec);
1202 /* First detect errors in declaring global registers. */
1203 if (reg_number == -1)
1204 error ("register name not specified for %q+D", decl);
1205 else if (reg_number < 0)
1206 error ("invalid register name for %q+D", decl);
1207 else if (TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
1208 error ("data type of %q+D isn%'t suitable for a register",
1210 else if (! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl))))
1211 error ("register specified for %q+D isn%'t suitable for data type",
1213 /* Now handle properly declared static register variables. */
1218 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
1220 DECL_INITIAL (decl) = 0;
1221 error ("global register variable has initial value");
1223 if (TREE_THIS_VOLATILE (decl))
1224 warning (OPT_Wvolatile_register_var,
1225 "optimization may eliminate reads and/or "
1226 "writes to register variables");
1228 /* If the user specified one of the eliminables registers here,
1229 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1230 confused with that register and be eliminated. This usage is
1231 somewhat suspect... */
1233 SET_DECL_RTL (decl, gen_rtx_raw_REG (DECL_MODE (decl), reg_number));
1234 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
1235 REG_USERVAR_P (DECL_RTL (decl)) = 1;
1237 if (TREE_STATIC (decl))
1239 /* Make this register global, so not usable for anything
1241 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1242 name = IDENTIFIER_POINTER (DECL_NAME (decl));
1243 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
1245 nregs = hard_regno_nregs[reg_number][DECL_MODE (decl)];
1247 globalize_reg (decl, reg_number + --nregs);
1250 /* As a register variable, it has no section. */
1254 /* Now handle ordinary static variables and functions (in memory).
1255 Also handle vars declared register invalidly. */
1256 else if (name[0] == '*')
1258 #ifdef REGISTER_PREFIX
1259 if (strlen (REGISTER_PREFIX) != 0)
1261 reg_number = decode_reg_name (name);
1262 if (reg_number >= 0 || reg_number == -3)
1263 error ("register name given for non-register variable %q+D", decl);
1268 /* Specifying a section attribute on a variable forces it into a
1269 non-.bss section, and thus it cannot be common. */
1270 /* FIXME: In general this code should not be necessary because
1271 visibility pass is doing the same work. But notice_global_symbol
1272 is called early and it needs to make DECL_RTL to get the name.
1273 we take care of recomputing the DECL_RTL after visibility is changed. */
1274 if (TREE_CODE (decl) == VAR_DECL
1275 && DECL_SECTION_NAME (decl) != NULL_TREE
1276 && DECL_INITIAL (decl) == NULL_TREE
1277 && DECL_COMMON (decl))
1278 DECL_COMMON (decl) = 0;
1280 /* Variables can't be both common and weak. */
1281 if (TREE_CODE (decl) == VAR_DECL && DECL_WEAK (decl))
1282 DECL_COMMON (decl) = 0;
1284 if (use_object_blocks_p () && use_blocks_for_decl_p (decl))
1285 x = create_block_symbol (name, get_block_for_decl (decl), -1);
1288 enum machine_mode address_mode = Pmode;
1289 if (TREE_TYPE (decl) != error_mark_node)
1291 addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (decl));
1292 address_mode = targetm.addr_space.address_mode (as);
1294 x = gen_rtx_SYMBOL_REF (address_mode, name);
1296 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
1297 SET_SYMBOL_REF_DECL (x, decl);
1299 x = gen_rtx_MEM (DECL_MODE (decl), x);
1300 if (TREE_CODE (decl) != FUNCTION_DECL)
1301 set_mem_attributes (x, decl, 1);
1302 SET_DECL_RTL (decl, x);
1304 /* Optionally set flags or add text to the name to record information
1305 such as that it is a function name.
1306 If the name is changed, the macro ASM_OUTPUT_LABELREF
1307 will have to know how to strip this information. */
1308 targetm.encode_section_info (decl, DECL_RTL (decl), true);
1310 /* Make this function static known to the mudflap runtime. */
1311 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1312 mudflap_enqueue_decl (decl);
1315 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1316 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1320 make_decl_rtl_for_debug (tree decl)
1322 unsigned int save_aliasing_flag, save_mudflap_flag;
1325 if (DECL_RTL_SET_P (decl))
1326 return DECL_RTL (decl);
1328 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1329 call new_alias_set. If running with -fcompare-debug, sometimes
1330 we do not want to create alias sets that will throw the alias
1331 numbers off in the comparison dumps. So... clearing
1332 flag_strict_aliasing will keep new_alias_set() from creating a
1333 new set. It is undesirable to register decl with mudflap
1334 in this case as well. */
1335 save_aliasing_flag = flag_strict_aliasing;
1336 flag_strict_aliasing = 0;
1337 save_mudflap_flag = flag_mudflap;
1340 rtl = DECL_RTL (decl);
1341 /* Reset DECL_RTL back, as various parts of the compiler expects
1342 DECL_RTL set meaning it is actually going to be output. */
1343 SET_DECL_RTL (decl, NULL);
1345 flag_strict_aliasing = save_aliasing_flag;
1346 flag_mudflap = save_mudflap_flag;
1351 /* Output a string of literal assembler code
1352 for an `asm' keyword used between functions. */
1355 assemble_asm (tree string)
1359 if (TREE_CODE (string) == ADDR_EXPR)
1360 string = TREE_OPERAND (string, 0);
1362 fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string));
1365 /* Record an element in the table of global destructors. SYMBOL is
1366 a SYMBOL_REF of the function to be called; PRIORITY is a number
1367 between 0 and MAX_INIT_PRIORITY. */
1370 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED,
1371 int priority ATTRIBUTE_UNUSED)
1373 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1374 /* Tell GNU LD that this is part of the static destructor set.
1375 This will work for any system that uses stabs, most usefully
1377 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1378 dbxout_stab_value_label (XSTR (symbol, 0));
1380 sorry ("global destructors not supported on this target");
1384 /* Write the address of the entity given by SYMBOL to SEC. */
1386 assemble_addr_to_section (rtx symbol, section *sec)
1388 switch_to_section (sec);
1389 assemble_align (POINTER_SIZE);
1390 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1393 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1394 not) section for PRIORITY. */
1396 get_cdtor_priority_section (int priority, bool constructor_p)
1400 /* ??? This only works reliably with the GNU linker. */
1401 sprintf (buf, "%s.%.5u",
1402 constructor_p ? ".ctors" : ".dtors",
1403 /* Invert the numbering so the linker puts us in the proper
1404 order; constructors are run from right to left, and the
1405 linker sorts in increasing order. */
1406 MAX_INIT_PRIORITY - priority);
1407 return get_section (buf, SECTION_WRITE, NULL);
1411 default_named_section_asm_out_destructor (rtx symbol, int priority)
1415 if (priority != DEFAULT_INIT_PRIORITY)
1416 sec = get_cdtor_priority_section (priority,
1417 /*constructor_p=*/false);
1419 sec = get_section (".dtors", SECTION_WRITE, NULL);
1421 assemble_addr_to_section (symbol, sec);
1424 #ifdef DTORS_SECTION_ASM_OP
1426 default_dtor_section_asm_out_destructor (rtx symbol,
1427 int priority ATTRIBUTE_UNUSED)
1429 assemble_addr_to_section (symbol, dtors_section);
1433 /* Likewise for global constructors. */
1436 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED,
1437 int priority ATTRIBUTE_UNUSED)
1439 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1440 /* Tell GNU LD that this is part of the static destructor set.
1441 This will work for any system that uses stabs, most usefully
1443 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1444 dbxout_stab_value_label (XSTR (symbol, 0));
1446 sorry ("global constructors not supported on this target");
1451 default_named_section_asm_out_constructor (rtx symbol, int priority)
1455 if (priority != DEFAULT_INIT_PRIORITY)
1456 sec = get_cdtor_priority_section (priority,
1457 /*constructor_p=*/true);
1459 sec = get_section (".ctors", SECTION_WRITE, NULL);
1461 assemble_addr_to_section (symbol, sec);
1464 #ifdef CTORS_SECTION_ASM_OP
1466 default_ctor_section_asm_out_constructor (rtx symbol,
1467 int priority ATTRIBUTE_UNUSED)
1469 assemble_addr_to_section (symbol, ctors_section);
1473 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1474 a nonzero value if the constant pool should be output before the
1475 start of the function, or a zero value if the pool should output
1476 after the end of the function. The default is to put it before the
1479 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1480 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1483 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1484 to be output to assembler.
1485 Set first_global_object_name and weak_global_object_name as appropriate. */
1488 notice_global_symbol (tree decl)
1490 const char **type = &first_global_object_name;
1492 if (first_global_object_name
1493 || !TREE_PUBLIC (decl)
1494 || DECL_EXTERNAL (decl)
1495 || !DECL_NAME (decl)
1496 || (TREE_CODE (decl) != FUNCTION_DECL
1497 && (TREE_CODE (decl) != VAR_DECL
1498 || (DECL_COMMON (decl)
1499 && (DECL_INITIAL (decl) == 0
1500 || DECL_INITIAL (decl) == error_mark_node))))
1501 || !MEM_P (DECL_RTL (decl)))
1504 /* We win when global object is found, but it is useful to know about weak
1505 symbol as well so we can produce nicer unique names. */
1506 if (DECL_WEAK (decl) || DECL_ONE_ONLY (decl) || flag_shlib)
1507 type = &weak_global_object_name;
1513 rtx decl_rtl = DECL_RTL (decl);
1515 p = targetm.strip_name_encoding (XSTR (XEXP (decl_rtl, 0), 0));
1516 name = ggc_strdup (p);
1522 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1523 current function goes into the cold section, so that targets can use
1524 current_function_section during RTL expansion. DECL describes the
1528 decide_function_section (tree decl)
1530 first_function_block_is_cold = false;
1532 if (flag_reorder_blocks_and_partition)
1533 /* We will decide in assemble_start_function. */
1536 if (DECL_SECTION_NAME (decl))
1538 struct cgraph_node *node = cgraph_get_node (current_function_decl);
1539 /* Calls to function_section rely on first_function_block_is_cold
1541 first_function_block_is_cold = (node
1543 == NODE_FREQUENCY_UNLIKELY_EXECUTED);
1546 in_cold_section_p = first_function_block_is_cold;
1549 /* Output assembler code for the constant pool of a function and associated
1550 with defining the name of the function. DECL describes the function.
1551 NAME is the function's name. For the constant pool, we use the current
1552 constant pool data. */
1555 assemble_start_function (tree decl, const char *fnname)
1558 char tmp_label[100];
1559 bool hot_label_written = false;
1561 if (flag_reorder_blocks_and_partition)
1563 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
1564 crtl->subsections.hot_section_label = ggc_strdup (tmp_label);
1565 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDB", const_labelno);
1566 crtl->subsections.cold_section_label = ggc_strdup (tmp_label);
1567 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTE", const_labelno);
1568 crtl->subsections.hot_section_end_label = ggc_strdup (tmp_label);
1569 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDE", const_labelno);
1570 crtl->subsections.cold_section_end_label = ggc_strdup (tmp_label);
1575 crtl->subsections.hot_section_label = NULL;
1576 crtl->subsections.cold_section_label = NULL;
1577 crtl->subsections.hot_section_end_label = NULL;
1578 crtl->subsections.cold_section_end_label = NULL;
1581 /* The following code does not need preprocessing in the assembler. */
1585 if (CONSTANT_POOL_BEFORE_FUNCTION)
1586 output_constant_pool (fnname, decl);
1588 /* Make sure the not and cold text (code) sections are properly
1589 aligned. This is necessary here in the case where the function
1590 has both hot and cold sections, because we don't want to re-set
1591 the alignment when the section switch happens mid-function. */
1593 if (flag_reorder_blocks_and_partition)
1595 first_function_block_is_cold = false;
1597 switch_to_section (unlikely_text_section ());
1598 assemble_align (DECL_ALIGN (decl));
1599 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_label);
1601 /* When the function starts with a cold section, we need to explicitly
1602 align the hot section and write out the hot section label.
1603 But if the current function is a thunk, we do not have a CFG. */
1605 && BB_PARTITION (ENTRY_BLOCK_PTR->next_bb) == BB_COLD_PARTITION)
1607 switch_to_section (text_section);
1608 assemble_align (DECL_ALIGN (decl));
1609 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1610 hot_label_written = true;
1611 first_function_block_is_cold = true;
1613 in_cold_section_p = first_function_block_is_cold;
1617 /* Switch to the correct text section for the start of the function. */
1619 switch_to_section (function_section (decl));
1620 if (flag_reorder_blocks_and_partition
1621 && !hot_label_written)
1622 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1624 /* Tell assembler to move to target machine's alignment for functions. */
1625 align = floor_log2 (DECL_ALIGN (decl) / BITS_PER_UNIT);
1628 ASM_OUTPUT_ALIGN (asm_out_file, align);
1631 /* Handle a user-specified function alignment.
1632 Note that we still need to align to DECL_ALIGN, as above,
1633 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1634 if (! DECL_USER_ALIGN (decl)
1635 && align_functions_log > align
1636 && optimize_function_for_speed_p (cfun))
1638 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1639 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
1640 align_functions_log, align_functions - 1);
1642 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1646 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1647 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1650 if (!DECL_IGNORED_P (decl))
1651 (*debug_hooks->begin_function) (decl);
1653 /* Make function name accessible from other files, if appropriate. */
1655 if (TREE_PUBLIC (decl))
1657 notice_global_symbol (decl);
1659 globalize_decl (decl);
1661 maybe_assemble_visibility (decl);
1664 if (DECL_PRESERVE_P (decl))
1665 targetm.asm_out.mark_decl_preserved (fnname);
1667 /* Do any machine/system dependent processing of the function name. */
1668 #ifdef ASM_DECLARE_FUNCTION_NAME
1669 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1671 /* Standard thing is just output label for the function. */
1672 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file, fnname, current_function_decl);
1673 #endif /* ASM_DECLARE_FUNCTION_NAME */
1675 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl)))
1676 saw_no_split_stack = true;
1679 /* Output assembler code associated with defining the size of the
1680 function. DECL describes the function. NAME is the function's name. */
1683 assemble_end_function (tree decl, const char *fnname ATTRIBUTE_UNUSED)
1685 #ifdef ASM_DECLARE_FUNCTION_SIZE
1686 /* We could have switched section in the middle of the function. */
1687 if (flag_reorder_blocks_and_partition)
1688 switch_to_section (function_section (decl));
1689 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1691 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1693 output_constant_pool (fnname, decl);
1694 switch_to_section (function_section (decl)); /* need to switch back */
1696 /* Output labels for end of hot/cold text sections (to be used by
1698 if (flag_reorder_blocks_and_partition)
1700 section *save_text_section;
1702 save_text_section = in_section;
1703 switch_to_section (unlikely_text_section ());
1704 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_end_label);
1705 if (first_function_block_is_cold)
1706 switch_to_section (text_section);
1708 switch_to_section (function_section (decl));
1709 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_end_label);
1710 switch_to_section (save_text_section);
1714 /* Assemble code to leave SIZE bytes of zeros. */
1717 assemble_zeros (unsigned HOST_WIDE_INT size)
1719 /* Do no output if -fsyntax-only. */
1720 if (flag_syntax_only)
1723 #ifdef ASM_NO_SKIP_IN_TEXT
1724 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1725 so we must output 0s explicitly in the text section. */
1726 if (ASM_NO_SKIP_IN_TEXT && (in_section->common.flags & SECTION_CODE) != 0)
1728 unsigned HOST_WIDE_INT i;
1729 for (i = 0; i < size; i++)
1730 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1735 ASM_OUTPUT_SKIP (asm_out_file, size);
1738 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1741 assemble_align (int align)
1743 if (align > BITS_PER_UNIT)
1745 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1749 /* Assemble a string constant with the specified C string as contents. */
1752 assemble_string (const char *p, int size)
1757 /* If the string is very long, split it up. */
1761 int thissize = size - pos;
1762 if (thissize > maximum)
1765 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1773 /* A noswitch_section_callback for lcomm_section. */
1776 emit_local (tree decl ATTRIBUTE_UNUSED,
1777 const char *name ATTRIBUTE_UNUSED,
1778 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1779 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1781 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1782 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name,
1783 size, DECL_ALIGN (decl));
1785 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1786 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, DECL_ALIGN (decl));
1789 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1794 /* A noswitch_section_callback for bss_noswitch_section. */
1796 #if defined ASM_OUTPUT_ALIGNED_BSS
1798 emit_bss (tree decl ATTRIBUTE_UNUSED,
1799 const char *name ATTRIBUTE_UNUSED,
1800 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1801 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1803 #if defined ASM_OUTPUT_ALIGNED_BSS
1804 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size, DECL_ALIGN (decl));
1810 /* A noswitch_section_callback for comm_section. */
1813 emit_common (tree decl ATTRIBUTE_UNUSED,
1814 const char *name ATTRIBUTE_UNUSED,
1815 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1816 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1818 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1819 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name,
1820 size, DECL_ALIGN (decl));
1822 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1823 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, DECL_ALIGN (decl));
1826 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded);
1831 /* A noswitch_section_callback for tls_comm_section. */
1834 emit_tls_common (tree decl ATTRIBUTE_UNUSED,
1835 const char *name ATTRIBUTE_UNUSED,
1836 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1837 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1839 #ifdef ASM_OUTPUT_TLS_COMMON
1840 ASM_OUTPUT_TLS_COMMON (asm_out_file, decl, name, size);
1843 sorry ("thread-local COMMON data not implemented");
1848 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1849 NAME is the name of DECL's SYMBOL_REF. */
1852 assemble_noswitch_variable (tree decl, const char *name, section *sect)
1854 unsigned HOST_WIDE_INT size, rounded;
1856 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
1859 /* Don't allocate zero bytes of common,
1860 since that means "undefined external" in the linker. */
1864 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1865 so that each uninitialized object starts on such a boundary. */
1866 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
1867 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1868 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1870 if (!sect->noswitch.callback (decl, name, size, rounded)
1871 && (unsigned HOST_WIDE_INT) DECL_ALIGN_UNIT (decl) > rounded)
1872 warning (0, "requested alignment for %q+D is greater than "
1873 "implemented alignment of %wu", decl, rounded);
1876 /* A subroutine of assemble_variable. Output the label and contents of
1877 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1878 is as for assemble_variable. */
1881 assemble_variable_contents (tree decl, const char *name,
1882 bool dont_output_data)
1884 /* Do any machine/system dependent processing of the object. */
1885 #ifdef ASM_DECLARE_OBJECT_NAME
1886 last_assemble_variable_decl = decl;
1887 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
1889 /* Standard thing is just output label for the object. */
1890 ASM_OUTPUT_LABEL (asm_out_file, name);
1891 #endif /* ASM_DECLARE_OBJECT_NAME */
1893 if (!dont_output_data)
1895 if (DECL_INITIAL (decl)
1896 && DECL_INITIAL (decl) != error_mark_node
1897 && !initializer_zerop (DECL_INITIAL (decl)))
1898 /* Output the actual data. */
1899 output_constant (DECL_INITIAL (decl),
1900 tree_low_cst (DECL_SIZE_UNIT (decl), 1),
1903 /* Leave space for it. */
1904 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl), 1));
1908 /* Assemble everything that is needed for a variable or function declaration.
1909 Not used for automatic variables, and not used for function definitions.
1910 Should not be called for variables of incomplete structure type.
1912 TOP_LEVEL is nonzero if this variable has file scope.
1913 AT_END is nonzero if this is the special handling, at end of compilation,
1914 to define things that have had only tentative definitions.
1915 DONT_OUTPUT_DATA if nonzero means don't actually output the
1916 initial value (that will be done by the caller). */
1919 assemble_variable (tree decl, int top_level ATTRIBUTE_UNUSED,
1920 int at_end ATTRIBUTE_UNUSED, int dont_output_data)
1923 rtx decl_rtl, symbol;
1926 /* This function is supposed to handle VARIABLES. Ensure we have one. */
1927 gcc_assert (TREE_CODE (decl) == VAR_DECL);
1929 /* Emulated TLS had better not get this far. */
1930 gcc_checking_assert (targetm.have_tls || !DECL_THREAD_LOCAL_P (decl));
1932 last_assemble_variable_decl = 0;
1934 /* Normally no need to say anything here for external references,
1935 since assemble_external is called by the language-specific code
1936 when a declaration is first seen. */
1938 if (DECL_EXTERNAL (decl))
1941 /* Do nothing for global register variables. */
1942 if (DECL_RTL_SET_P (decl) && REG_P (DECL_RTL (decl)))
1944 TREE_ASM_WRITTEN (decl) = 1;
1948 /* If type was incomplete when the variable was declared,
1949 see if it is complete now. */
1951 if (DECL_SIZE (decl) == 0)
1952 layout_decl (decl, 0);
1954 /* Still incomplete => don't allocate it; treat the tentative defn
1955 (which is what it must have been) as an `extern' reference. */
1957 if (!dont_output_data && DECL_SIZE (decl) == 0)
1959 error ("storage size of %q+D isn%'t known", decl);
1960 TREE_ASM_WRITTEN (decl) = 1;
1964 /* The first declaration of a variable that comes through this function
1965 decides whether it is global (in C, has external linkage)
1966 or local (in C, has internal linkage). So do nothing more
1967 if this function has already run. */
1969 if (TREE_ASM_WRITTEN (decl))
1972 /* Make sure targetm.encode_section_info is invoked before we set
1974 decl_rtl = DECL_RTL (decl);
1976 TREE_ASM_WRITTEN (decl) = 1;
1978 /* Do no output if -fsyntax-only. */
1979 if (flag_syntax_only)
1982 if (! dont_output_data
1983 && ! host_integerp (DECL_SIZE_UNIT (decl), 1))
1985 error ("size of variable %q+D is too large", decl);
1989 gcc_assert (MEM_P (decl_rtl));
1990 gcc_assert (GET_CODE (XEXP (decl_rtl, 0)) == SYMBOL_REF);
1991 symbol = XEXP (decl_rtl, 0);
1993 /* If this symbol belongs to the tree constant pool, output the constant
1994 if it hasn't already been written. */
1995 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
1997 tree decl = SYMBOL_REF_DECL (symbol);
1998 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl)))
1999 output_constant_def_contents (symbol);
2005 name = XSTR (symbol, 0);
2006 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
2007 notice_global_symbol (decl);
2009 /* Compute the alignment of this data. */
2011 align_variable (decl, dont_output_data);
2012 set_mem_align (decl_rtl, DECL_ALIGN (decl));
2014 if (TREE_PUBLIC (decl))
2015 maybe_assemble_visibility (decl);
2017 if (DECL_PRESERVE_P (decl))
2018 targetm.asm_out.mark_decl_preserved (name);
2020 /* First make the assembler name(s) global if appropriate. */
2021 sect = get_variable_section (decl, false);
2022 if (TREE_PUBLIC (decl)
2023 && (sect->common.flags & SECTION_COMMON) == 0)
2024 globalize_decl (decl);
2026 /* Output any data that we will need to use the address of. */
2027 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
2028 output_addressed_constants (DECL_INITIAL (decl));
2030 /* dbxout.c needs to know this. */
2031 if (sect && (sect->common.flags & SECTION_CODE) != 0)
2032 DECL_IN_TEXT_SECTION (decl) = 1;
2034 /* If the decl is part of an object_block, make sure that the decl
2035 has been positioned within its block, but do not write out its
2036 definition yet. output_object_blocks will do that later. */
2037 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
2039 gcc_assert (!dont_output_data);
2040 place_block_symbol (symbol);
2042 else if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
2043 assemble_noswitch_variable (decl, name, sect);
2046 switch_to_section (sect);
2047 if (DECL_ALIGN (decl) > BITS_PER_UNIT)
2048 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (DECL_ALIGN_UNIT (decl)));
2049 assemble_variable_contents (decl, name, dont_output_data);
2053 /* Return 1 if type TYPE contains any pointers. */
2056 contains_pointers_p (tree type)
2058 switch (TREE_CODE (type))
2061 case REFERENCE_TYPE:
2062 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2063 so I'll play safe and return 1. */
2069 case QUAL_UNION_TYPE:
2072 /* For a type that has fields, see if the fields have pointers. */
2073 for (fields = TYPE_FIELDS (type); fields; fields = DECL_CHAIN (fields))
2074 if (TREE_CODE (fields) == FIELD_DECL
2075 && contains_pointers_p (TREE_TYPE (fields)))
2081 /* An array type contains pointers if its element type does. */
2082 return contains_pointers_p (TREE_TYPE (type));
2089 /* We delay assemble_external processing until
2090 the compilation unit is finalized. This is the best we can do for
2091 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2092 it all the way to final. See PR 17982 for further discussion. */
2093 static GTY(()) tree pending_assemble_externals;
2095 #ifdef ASM_OUTPUT_EXTERNAL
2096 /* True if DECL is a function decl for which no out-of-line copy exists.
2097 It is assumed that DECL's assembler name has been set. */
2100 incorporeal_function_p (tree decl)
2102 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
2106 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
2107 && (DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA
2108 || DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA_WITH_ALIGN))
2111 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
2112 /* Atomic or sync builtins which have survived this far will be
2113 resolved externally and therefore are not incorporeal. */
2114 if (strncmp (name, "__builtin_", 10) == 0)
2120 /* Actually do the tests to determine if this is necessary, and invoke
2121 ASM_OUTPUT_EXTERNAL. */
2123 assemble_external_real (tree decl)
2125 rtx rtl = DECL_RTL (decl);
2127 if (MEM_P (rtl) && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
2128 && !SYMBOL_REF_USED (XEXP (rtl, 0))
2129 && !incorporeal_function_p (decl))
2131 /* Some systems do require some output. */
2132 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
2133 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
2139 process_pending_assemble_externals (void)
2141 #ifdef ASM_OUTPUT_EXTERNAL
2143 for (list = pending_assemble_externals; list; list = TREE_CHAIN (list))
2144 assemble_external_real (TREE_VALUE (list));
2146 pending_assemble_externals = 0;
2150 /* This TREE_LIST contains any weak symbol declarations waiting
2152 static GTY(()) tree weak_decls;
2154 /* Output something to declare an external symbol to the assembler,
2155 and qualifiers such as weakness. (Most assemblers don't need
2156 extern declaration, so we normally output nothing.) Do nothing if
2157 DECL is not external. */
2160 assemble_external (tree decl ATTRIBUTE_UNUSED)
2162 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2163 main body of this code is only rarely exercised. To provide some
2164 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2165 open. If it's not, we should not be calling this function. */
2166 gcc_assert (asm_out_file);
2168 if (!DECL_P (decl) || !DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
2171 /* We want to output annotation for weak and external symbols at
2172 very last to check if they are references or not. */
2174 if (TARGET_SUPPORTS_WEAK
2176 /* TREE_STATIC is a weird and abused creature which is not
2177 generally the right test for whether an entity has been
2178 locally emitted, inlined or otherwise not-really-extern, but
2179 for declarations that can be weak, it happens to be
2181 && !TREE_STATIC (decl)
2182 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl))
2183 && value_member (decl, weak_decls) == NULL_TREE)
2184 weak_decls = tree_cons (NULL, decl, weak_decls);
2186 #ifdef ASM_OUTPUT_EXTERNAL
2187 if (value_member (decl, pending_assemble_externals) == NULL_TREE)
2188 pending_assemble_externals = tree_cons (NULL, decl,
2189 pending_assemble_externals);
2193 /* Similar, for calling a library function FUN. */
2196 assemble_external_libcall (rtx fun)
2198 /* Declare library function name external when first used, if nec. */
2199 if (! SYMBOL_REF_USED (fun))
2201 SYMBOL_REF_USED (fun) = 1;
2202 targetm.asm_out.external_libcall (fun);
2206 /* Assemble a label named NAME. */
2209 assemble_label (FILE *file, const char *name)
2211 ASM_OUTPUT_LABEL (file, name);
2214 /* Set the symbol_referenced flag for ID. */
2216 mark_referenced (tree id)
2218 TREE_SYMBOL_REFERENCED (id) = 1;
2221 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2223 mark_decl_referenced (tree decl)
2225 if (TREE_CODE (decl) == FUNCTION_DECL)
2227 /* Extern inline functions don't become needed when referenced.
2228 If we know a method will be emitted in other TU and no new
2229 functions can be marked reachable, just use the external
2231 struct cgraph_node *node = cgraph_get_create_node (decl);
2232 if (!DECL_EXTERNAL (decl)
2233 && !node->local.finalized)
2234 cgraph_mark_needed_node (node);
2236 else if (TREE_CODE (decl) == VAR_DECL)
2238 struct varpool_node *node = varpool_node (decl);
2239 varpool_mark_needed_node (node);
2240 /* C++ frontend use mark_decl_references to force COMDAT variables
2241 to be output that might appear dead otherwise. */
2242 node->force_output = true;
2244 /* else do nothing - we can get various sorts of CST nodes here,
2245 which do not need to be marked. */
2249 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2250 until we find an identifier that is not itself a transparent alias.
2251 Modify the alias passed to it by reference (and all aliases on the
2252 way to the ultimate target), such that they do not have to be
2253 followed again, and return the ultimate target of the alias
2257 ultimate_transparent_alias_target (tree *alias)
2259 tree target = *alias;
2261 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
2263 gcc_assert (TREE_CHAIN (target));
2264 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
2265 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
2266 && ! TREE_CHAIN (target));
2273 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2274 starts with a *, the rest of NAME is output verbatim. Otherwise
2275 NAME is transformed in a target-specific way (usually by the
2276 addition of an underscore). */
2279 assemble_name_raw (FILE *file, const char *name)
2282 fputs (&name[1], file);
2284 ASM_OUTPUT_LABELREF (file, name);
2287 /* Like assemble_name_raw, but should be used when NAME might refer to
2288 an entity that is also represented as a tree (like a function or
2289 variable). If NAME does refer to such an entity, that entity will
2290 be marked as referenced. */
2293 assemble_name (FILE *file, const char *name)
2295 const char *real_name;
2298 real_name = targetm.strip_name_encoding (name);
2300 id = maybe_get_identifier (real_name);
2305 mark_referenced (id);
2306 ultimate_transparent_alias_target (&id);
2308 name = IDENTIFIER_POINTER (id);
2309 gcc_assert (! TREE_CHAIN (id));
2312 assemble_name_raw (file, name);
2315 /* Allocate SIZE bytes writable static space with a gensym name
2316 and return an RTX to refer to its address. */
2319 assemble_static_space (unsigned HOST_WIDE_INT size)
2322 const char *namestring;
2325 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2327 namestring = ggc_strdup (name);
2329 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2330 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2332 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2333 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2336 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2337 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2340 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2341 so that each uninitialized object starts on such a boundary. */
2342 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2343 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2344 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2345 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2346 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2347 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2354 /* Assemble the static constant template for function entry trampolines.
2355 This is done at most once per compilation.
2356 Returns an RTX for the address of the template. */
2358 static GTY(()) rtx initial_trampoline;
2361 assemble_trampoline_template (void)
2368 gcc_assert (targetm.asm_out.trampoline_template != NULL);
2370 if (initial_trampoline)
2371 return initial_trampoline;
2373 /* By default, put trampoline templates in read-only data section. */
2375 #ifdef TRAMPOLINE_SECTION
2376 switch_to_section (TRAMPOLINE_SECTION);
2378 switch_to_section (readonly_data_section);
2381 /* Write the assembler code to define one. */
2382 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2384 ASM_OUTPUT_ALIGN (asm_out_file, align);
2386 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2387 targetm.asm_out.trampoline_template (asm_out_file);
2389 /* Record the rtl to refer to it. */
2390 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2391 name = ggc_strdup (label);
2392 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2393 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2395 initial_trampoline = gen_const_mem (BLKmode, symbol);
2396 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2397 set_mem_size (initial_trampoline, TRAMPOLINE_SIZE);
2399 return initial_trampoline;
2402 /* A and B are either alignments or offsets. Return the minimum alignment
2403 that may be assumed after adding the two together. */
2405 static inline unsigned
2406 min_align (unsigned int a, unsigned int b)
2408 return (a | b) & -(a | b);
2411 /* Return the assembler directive for creating a given kind of integer
2412 object. SIZE is the number of bytes in the object and ALIGNED_P
2413 indicates whether it is known to be aligned. Return NULL if the
2414 assembly dialect has no such directive.
2416 The returned string should be printed at the start of a new line and
2417 be followed immediately by the object's initial value. */
2420 integer_asm_op (int size, int aligned_p)
2422 struct asm_int_op *ops;
2425 ops = &targetm.asm_out.aligned_op;
2427 ops = &targetm.asm_out.unaligned_op;
2432 return targetm.asm_out.byte_op;
2446 /* Use directive OP to assemble an integer object X. Print OP at the
2447 start of the line, followed immediately by the value of X. */
2450 assemble_integer_with_op (const char *op, rtx x)
2452 fputs (op, asm_out_file);
2453 output_addr_const (asm_out_file, x);
2454 fputc ('\n', asm_out_file);
2457 /* The default implementation of the asm_out.integer target hook. */
2460 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2461 unsigned int size ATTRIBUTE_UNUSED,
2462 int aligned_p ATTRIBUTE_UNUSED)
2464 const char *op = integer_asm_op (size, aligned_p);
2465 /* Avoid GAS bugs for large values. Specifically negative values whose
2466 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2467 if (size > UNITS_PER_WORD && size > POINTER_SIZE / BITS_PER_UNIT)
2469 return op && (assemble_integer_with_op (op, x), true);
2472 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2473 the alignment of the integer in bits. Return 1 if we were able to output
2474 the constant, otherwise 0. We must be able to output the constant,
2475 if FORCE is nonzero. */
2478 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2482 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2484 /* See if the target hook can handle this kind of object. */
2485 if (targetm.asm_out.integer (x, size, aligned_p))
2488 /* If the object is a multi-byte one, try splitting it up. Split
2489 it into words it if is multi-word, otherwise split it into bytes. */
2492 enum machine_mode omode, imode;
2493 unsigned int subalign;
2494 unsigned int subsize, i;
2495 enum mode_class mclass;
2497 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2498 subalign = MIN (align, subsize * BITS_PER_UNIT);
2499 if (GET_CODE (x) == CONST_FIXED)
2500 mclass = GET_MODE_CLASS (GET_MODE (x));
2504 omode = mode_for_size (subsize * BITS_PER_UNIT, mclass, 0);
2505 imode = mode_for_size (size * BITS_PER_UNIT, mclass, 0);
2507 for (i = 0; i < size; i += subsize)
2509 rtx partial = simplify_subreg (omode, x, imode, i);
2510 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2516 /* If we've printed some of it, but not all of it, there's no going
2521 gcc_assert (!force);
2527 assemble_real (REAL_VALUE_TYPE d, enum machine_mode mode, unsigned int align)
2529 long data[4] = {0, 0, 0, 0};
2531 int bitsize, nelts, nunits, units_per;
2533 /* This is hairy. We have a quantity of known size. real_to_target
2534 will put it into an array of *host* longs, 32 bits per element
2535 (even if long is more than 32 bits). We need to determine the
2536 number of array elements that are occupied (nelts) and the number
2537 of *target* min-addressable units that will be occupied in the
2538 object file (nunits). We cannot assume that 32 divides the
2539 mode's bitsize (size * BITS_PER_UNIT) evenly.
2541 size * BITS_PER_UNIT is used here to make sure that padding bits
2542 (which might appear at either end of the value; real_to_target
2543 will include the padding bits in its output array) are included. */
2545 nunits = GET_MODE_SIZE (mode);
2546 bitsize = nunits * BITS_PER_UNIT;
2547 nelts = CEIL (bitsize, 32);
2548 units_per = 32 / BITS_PER_UNIT;
2550 real_to_target (data, &d, mode);
2552 /* Put out the first word with the specified alignment. */
2553 assemble_integer (GEN_INT (data[0]), MIN (nunits, units_per), align, 1);
2554 nunits -= units_per;
2556 /* Subsequent words need only 32-bit alignment. */
2557 align = min_align (align, 32);
2559 for (i = 1; i < nelts; i++)
2561 assemble_integer (GEN_INT (data[i]), MIN (nunits, units_per), align, 1);
2562 nunits -= units_per;
2566 /* Given an expression EXP with a constant value,
2567 reduce it to the sum of an assembler symbol and an integer.
2568 Store them both in the structure *VALUE.
2569 EXP must be reducible. */
2573 HOST_WIDE_INT offset;
2577 decode_addr_const (tree exp, struct addr_const *value)
2579 tree target = TREE_OPERAND (exp, 0);
2585 if (TREE_CODE (target) == COMPONENT_REF
2586 && host_integerp (byte_position (TREE_OPERAND (target, 1)), 0))
2588 offset += int_byte_position (TREE_OPERAND (target, 1));
2589 target = TREE_OPERAND (target, 0);
2591 else if (TREE_CODE (target) == ARRAY_REF
2592 || TREE_CODE (target) == ARRAY_RANGE_REF)
2594 offset += (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target)), 1)
2595 * tree_low_cst (TREE_OPERAND (target, 1), 0));
2596 target = TREE_OPERAND (target, 0);
2598 else if (TREE_CODE (target) == MEM_REF
2599 && TREE_CODE (TREE_OPERAND (target, 0)) == ADDR_EXPR)
2601 offset += mem_ref_offset (target).low;
2602 target = TREE_OPERAND (TREE_OPERAND (target, 0), 0);
2604 else if (TREE_CODE (target) == INDIRECT_REF
2605 && TREE_CODE (TREE_OPERAND (target, 0)) == NOP_EXPR
2606 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target, 0), 0))
2608 target = TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target, 0), 0), 0);
2613 switch (TREE_CODE (target))
2617 x = DECL_RTL (target);
2621 x = gen_rtx_MEM (FUNCTION_MODE,
2622 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2631 x = output_constant_def (target, 1);
2638 gcc_assert (MEM_P (x));
2642 value->offset = offset;
2646 static GTY((param_is (struct constant_descriptor_tree)))
2647 htab_t const_desc_htab;
2649 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2651 /* Constant pool accessor function. */
2654 constant_pool_htab (void)
2656 return const_desc_htab;
2659 /* Compute a hash code for a constant expression. */
2662 const_desc_hash (const void *ptr)
2664 return ((const struct constant_descriptor_tree *)ptr)->hash;
2668 const_hash_1 (const tree exp)
2673 enum tree_code code = TREE_CODE (exp);
2675 /* Either set P and LEN to the address and len of something to hash and
2676 exit the switch or return a value. */
2681 p = (char *) &TREE_INT_CST (exp);
2682 len = sizeof TREE_INT_CST (exp);
2686 return real_hash (TREE_REAL_CST_PTR (exp));
2689 return fixed_hash (TREE_FIXED_CST_PTR (exp));
2692 p = TREE_STRING_POINTER (exp);
2693 len = TREE_STRING_LENGTH (exp);
2697 return (const_hash_1 (TREE_REALPART (exp)) * 5
2698 + const_hash_1 (TREE_IMAGPART (exp)));
2704 hi = 7 + TYPE_VECTOR_SUBPARTS (TREE_TYPE (exp));
2706 for (link = TREE_VECTOR_CST_ELTS (exp); link; link = TREE_CHAIN (link))
2707 hi = hi * 563 + const_hash_1 (TREE_VALUE (link));
2714 unsigned HOST_WIDE_INT idx;
2717 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2719 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
2721 hi = hi * 603 + const_hash_1 (value);
2729 struct addr_const value;
2731 decode_addr_const (exp, &value);
2732 switch (GET_CODE (value.base))
2735 /* Don't hash the address of the SYMBOL_REF;
2736 only use the offset and the symbol name. */
2738 p = XSTR (value.base, 0);
2739 for (i = 0; p[i] != 0; i++)
2740 hi = ((hi * 613) + (unsigned) (p[i]));
2744 hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
2754 case POINTER_PLUS_EXPR:
2756 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2757 + const_hash_1 (TREE_OPERAND (exp, 1)));
2760 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2763 /* A language specific constant. Just hash the code. */
2767 /* Compute hashing function. */
2769 for (i = 0; i < len; i++)
2770 hi = ((hi * 613) + (unsigned) (p[i]));
2775 /* Wrapper of compare_constant, for the htab interface. */
2777 const_desc_eq (const void *p1, const void *p2)
2779 const struct constant_descriptor_tree *const c1
2780 = (const struct constant_descriptor_tree *) p1;
2781 const struct constant_descriptor_tree *const c2
2782 = (const struct constant_descriptor_tree *) p2;
2783 if (c1->hash != c2->hash)
2785 return compare_constant (c1->value, c2->value);
2788 /* Compare t1 and t2, and return 1 only if they are known to result in
2789 the same bit pattern on output. */
2792 compare_constant (const tree t1, const tree t2)
2794 enum tree_code typecode;
2796 if (t1 == NULL_TREE)
2797 return t2 == NULL_TREE;
2798 if (t2 == NULL_TREE)
2801 if (TREE_CODE (t1) != TREE_CODE (t2))
2804 switch (TREE_CODE (t1))
2807 /* Integer constants are the same only if the same width of type. */
2808 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2810 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2812 return tree_int_cst_equal (t1, t2);
2815 /* Real constants are the same only if the same width of type. */
2816 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2819 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
2822 /* Fixed constants are the same only if the same width of type. */
2823 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2826 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1), TREE_FIXED_CST (t2));
2829 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2832 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
2833 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
2834 TREE_STRING_LENGTH (t1)));
2837 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
2838 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
2844 if (TYPE_VECTOR_SUBPARTS (TREE_TYPE (t1))
2845 != TYPE_VECTOR_SUBPARTS (TREE_TYPE (t2)))
2848 link2 = TREE_VECTOR_CST_ELTS (t2);
2849 for (link1 = TREE_VECTOR_CST_ELTS (t1);
2851 link1 = TREE_CHAIN (link1))
2853 if (!compare_constant (TREE_VALUE (link1), TREE_VALUE (link2)))
2855 link2 = TREE_CHAIN (link2);
2863 VEC(constructor_elt, gc) *v1, *v2;
2864 unsigned HOST_WIDE_INT idx;
2866 typecode = TREE_CODE (TREE_TYPE (t1));
2867 if (typecode != TREE_CODE (TREE_TYPE (t2)))
2870 if (typecode == ARRAY_TYPE)
2872 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
2873 /* For arrays, check that the sizes all match. */
2874 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
2876 || size_1 != int_size_in_bytes (TREE_TYPE (t2)))
2881 /* For record and union constructors, require exact type
2883 if (TREE_TYPE (t1) != TREE_TYPE (t2))
2887 v1 = CONSTRUCTOR_ELTS (t1);
2888 v2 = CONSTRUCTOR_ELTS (t2);
2889 if (VEC_length (constructor_elt, v1)
2890 != VEC_length (constructor_elt, v2))
2893 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
2895 constructor_elt *c1 = VEC_index (constructor_elt, v1, idx);
2896 constructor_elt *c2 = VEC_index (constructor_elt, v2, idx);
2898 /* Check that each value is the same... */
2899 if (!compare_constant (c1->value, c2->value))
2901 /* ... and that they apply to the same fields! */
2902 if (typecode == ARRAY_TYPE)
2904 if (!compare_constant (c1->index, c2->index))
2909 if (c1->index != c2->index)
2920 struct addr_const value1, value2;
2924 decode_addr_const (t1, &value1);
2925 decode_addr_const (t2, &value2);
2927 if (value1.offset != value2.offset)
2930 code = GET_CODE (value1.base);
2931 if (code != GET_CODE (value2.base))
2937 ret = (strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
2941 ret = (CODE_LABEL_NUMBER (XEXP (value1.base, 0))
2942 == CODE_LABEL_NUMBER (XEXP (value2.base, 0)));
2952 case POINTER_PLUS_EXPR:
2955 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
2956 && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
2959 case VIEW_CONVERT_EXPR:
2960 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
2969 /* Make a copy of the whole tree structure for a constant. This
2970 handles the same types of nodes that compare_constant handles. */
2973 copy_constant (tree exp)
2975 switch (TREE_CODE (exp))
2978 /* For ADDR_EXPR, we do not want to copy the decl whose address
2979 is requested. We do want to copy constants though. */
2980 if (CONSTANT_CLASS_P (TREE_OPERAND (exp, 0)))
2981 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2982 copy_constant (TREE_OPERAND (exp, 0)));
2984 return copy_node (exp);
2990 return copy_node (exp);
2993 return build_complex (TREE_TYPE (exp),
2994 copy_constant (TREE_REALPART (exp)),
2995 copy_constant (TREE_IMAGPART (exp)));
2998 case POINTER_PLUS_EXPR:
3000 return build2 (TREE_CODE (exp), TREE_TYPE (exp),
3001 copy_constant (TREE_OPERAND (exp, 0)),
3002 copy_constant (TREE_OPERAND (exp, 1)));
3005 case VIEW_CONVERT_EXPR:
3006 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
3007 copy_constant (TREE_OPERAND (exp, 0)));
3010 return build_vector (TREE_TYPE (exp),
3011 copy_list (TREE_VECTOR_CST_ELTS (exp)));
3015 tree copy = copy_node (exp);
3016 VEC(constructor_elt, gc) *v;
3017 unsigned HOST_WIDE_INT idx;
3018 tree purpose, value;
3020 v = VEC_alloc(constructor_elt, gc, VEC_length(constructor_elt,
3021 CONSTRUCTOR_ELTS (exp)));
3022 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, purpose, value)
3024 constructor_elt *ce = VEC_quick_push (constructor_elt, v, NULL);
3025 ce->index = purpose;
3026 ce->value = copy_constant (value);
3028 CONSTRUCTOR_ELTS (copy) = v;
3037 /* Return the section into which constant EXP should be placed. */
3040 get_constant_section (tree exp, unsigned int align)
3042 return targetm.asm_out.select_section (exp,
3043 compute_reloc_for_constant (exp),
3047 /* Return the size of constant EXP in bytes. */
3049 static HOST_WIDE_INT
3050 get_constant_size (tree exp)
3054 size = int_size_in_bytes (TREE_TYPE (exp));
3055 if (TREE_CODE (exp) == STRING_CST)
3056 size = MAX (TREE_STRING_LENGTH (exp), size);
3060 /* Subroutine of output_constant_def:
3061 No constant equal to EXP is known to have been output.
3062 Make a constant descriptor to enter EXP in the hash table.
3063 Assign the label number and construct RTL to refer to the
3064 constant's location in memory.
3065 Caller is responsible for updating the hash table. */
3067 static struct constant_descriptor_tree *
3068 build_constant_desc (tree exp)
3070 struct constant_descriptor_tree *desc;
3076 desc = ggc_alloc_constant_descriptor_tree ();
3077 desc->value = copy_constant (exp);
3079 /* Propagate marked-ness to copied constant. */
3080 if (flag_mudflap && mf_marked_p (exp))
3081 mf_mark (desc->value);
3083 /* Create a string containing the label name, in LABEL. */
3084 labelno = const_labelno++;
3085 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
3087 /* Construct the VAR_DECL associated with the constant. */
3088 decl = build_decl (UNKNOWN_LOCATION, VAR_DECL, get_identifier (label),
3090 DECL_ARTIFICIAL (decl) = 1;
3091 DECL_IGNORED_P (decl) = 1;
3092 TREE_READONLY (decl) = 1;
3093 TREE_STATIC (decl) = 1;
3094 TREE_ADDRESSABLE (decl) = 1;
3095 /* We don't set the RTL yet as this would cause varpool to assume that the
3096 variable is referenced. Moreover, it would just be dropped in LTO mode.
3097 Instead we set the flag that will be recognized in make_decl_rtl. */
3098 DECL_IN_CONSTANT_POOL (decl) = 1;
3099 DECL_INITIAL (decl) = desc->value;
3100 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3101 architectures so use DATA_ALIGNMENT as well, except for strings. */
3102 if (TREE_CODE (exp) == STRING_CST)
3104 #ifdef CONSTANT_ALIGNMENT
3105 DECL_ALIGN (decl) = CONSTANT_ALIGNMENT (exp, DECL_ALIGN (decl));
3109 align_variable (decl, 0);
3111 /* Now construct the SYMBOL_REF and the MEM. */
3112 if (use_object_blocks_p ())
3114 section *sect = get_constant_section (exp, DECL_ALIGN (decl));
3115 symbol = create_block_symbol (ggc_strdup (label),
3116 get_block_for_section (sect), -1);
3119 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3120 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3121 SET_SYMBOL_REF_DECL (symbol, decl);
3122 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3124 rtl = gen_const_mem (TYPE_MODE (TREE_TYPE (exp)), symbol);
3125 set_mem_attributes (rtl, exp, 1);
3126 set_mem_alias_set (rtl, 0);
3127 set_mem_alias_set (rtl, const_alias_set);
3129 /* We cannot share RTX'es in pool entries.
3130 Mark this piece of RTL as required for unsharing. */
3131 RTX_FLAG (rtl, used) = 1;
3133 /* Set flags or add text to the name to record information, such as
3134 that it is a local symbol. If the name is changed, the macro
3135 ASM_OUTPUT_LABELREF will have to know how to strip this
3136 information. This call might invalidate our local variable
3137 SYMBOL; we can't use it afterward. */
3138 targetm.encode_section_info (exp, rtl, true);
3145 /* Return an rtx representing a reference to constant data in memory
3146 for the constant expression EXP.
3148 If assembler code for such a constant has already been output,
3149 return an rtx to refer to it.
3150 Otherwise, output such a constant in memory
3151 and generate an rtx for it.
3153 If DEFER is nonzero, this constant can be deferred and output only
3154 if referenced in the function after all optimizations.
3156 `const_desc_table' records which constants already have label strings. */
3159 output_constant_def (tree exp, int defer)
3161 struct constant_descriptor_tree *desc;
3162 struct constant_descriptor_tree key;
3165 /* Look up EXP in the table of constant descriptors. If we didn't find
3166 it, create a new one. */
3168 key.hash = const_hash_1 (exp);
3169 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
3171 desc = (struct constant_descriptor_tree *) *loc;
3174 desc = build_constant_desc (exp);
3175 desc->hash = key.hash;
3179 maybe_output_constant_def_contents (desc, defer);
3183 /* Subroutine of output_constant_def: Decide whether or not we need to
3184 output the constant DESC now, and if so, do it. */
3186 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
3189 rtx symbol = XEXP (desc->rtl, 0);
3190 tree exp = desc->value;
3192 if (flag_syntax_only)
3195 if (TREE_ASM_WRITTEN (exp))
3196 /* Already output; don't do it again. */
3199 /* We can always defer constants as long as the context allows
3203 /* Increment n_deferred_constants if it exists. It needs to be at
3204 least as large as the number of constants actually referred to
3205 by the function. If it's too small we'll stop looking too early
3206 and fail to emit constants; if it's too large we'll only look
3207 through the entire function when we could have stopped earlier. */
3209 n_deferred_constants++;
3213 output_constant_def_contents (symbol);
3216 /* Subroutine of output_constant_def_contents. Output the definition
3217 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3218 constant's alignment in bits. */
3221 assemble_constant_contents (tree exp, const char *label, unsigned int align)
3225 size = get_constant_size (exp);
3227 /* Do any machine/system dependent processing of the constant. */
3228 targetm.asm_out.declare_constant_name (asm_out_file, label, exp, size);
3230 /* Output the value of EXP. */
3231 output_constant (exp, size, align);
3234 /* We must output the constant data referred to by SYMBOL; do so. */
3237 output_constant_def_contents (rtx symbol)
3239 tree decl = SYMBOL_REF_DECL (symbol);
3240 tree exp = DECL_INITIAL (decl);
3243 /* Make sure any other constants whose addresses appear in EXP
3244 are assigned label numbers. */
3245 output_addressed_constants (exp);
3247 /* We are no longer deferring this constant. */
3248 TREE_ASM_WRITTEN (decl) = TREE_ASM_WRITTEN (exp) = 1;
3250 /* If the constant is part of an object block, make sure that the
3251 decl has been positioned within its block, but do not write out
3252 its definition yet. output_object_blocks will do that later. */
3253 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
3254 place_block_symbol (symbol);
3257 align = DECL_ALIGN (decl);
3258 switch_to_section (get_constant_section (exp, align));
3259 if (align > BITS_PER_UNIT)
3260 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
3261 assemble_constant_contents (exp, XSTR (symbol, 0), align);
3264 mudflap_enqueue_constant (exp);
3267 /* Look up EXP in the table of constant descriptors. Return the rtl
3268 if it has been emitted, else null. */
3271 lookup_constant_def (tree exp)
3273 struct constant_descriptor_tree *desc;
3274 struct constant_descriptor_tree key;
3277 key.hash = const_hash_1 (exp);
3278 desc = (struct constant_descriptor_tree *)
3279 htab_find_with_hash (const_desc_htab, &key, key.hash);
3281 return (desc ? desc->rtl : NULL_RTX);
3284 /* Return a tree representing a reference to constant data in memory
3285 for the constant expression EXP.
3287 This is the counterpart of output_constant_def at the Tree level. */
3290 tree_output_constant_def (tree exp)
3292 struct constant_descriptor_tree *desc, key;
3296 /* Look up EXP in the table of constant descriptors. If we didn't find
3297 it, create a new one. */
3299 key.hash = const_hash_1 (exp);
3300 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
3302 desc = (struct constant_descriptor_tree *) *loc;
3305 desc = build_constant_desc (exp);
3306 desc->hash = key.hash;
3310 decl = SYMBOL_REF_DECL (XEXP (desc->rtl, 0));
3311 varpool_finalize_decl (decl);
3315 /* Used in the hash tables to avoid outputting the same constant
3316 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3317 are output once per function, not once per file. */
3318 /* ??? Only a few targets need per-function constant pools. Most
3319 can use one per-file pool. Should add a targetm bit to tell the
3322 struct GTY(()) rtx_constant_pool {
3323 /* Pointers to first and last constant in pool, as ordered by offset. */
3324 struct constant_descriptor_rtx *first;
3325 struct constant_descriptor_rtx *last;
3327 /* Hash facility for making memory-constants from constant rtl-expressions.
3328 It is used on RISC machines where immediate integer arguments and
3329 constant addresses are restricted so that such constants must be stored
3331 htab_t GTY((param_is (struct constant_descriptor_rtx))) const_rtx_htab;
3333 /* Current offset in constant pool (does not include any
3334 machine-specific header). */
3335 HOST_WIDE_INT offset;
3338 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx {
3339 struct constant_descriptor_rtx *next;
3343 HOST_WIDE_INT offset;
3345 enum machine_mode mode;
3351 /* Hash and compare functions for const_rtx_htab. */
3354 const_desc_rtx_hash (const void *ptr)
3356 const struct constant_descriptor_rtx *const desc
3357 = (const struct constant_descriptor_rtx *) ptr;
3362 const_desc_rtx_eq (const void *a, const void *b)
3364 const struct constant_descriptor_rtx *const x
3365 = (const struct constant_descriptor_rtx *) a;
3366 const struct constant_descriptor_rtx *const y
3367 = (const struct constant_descriptor_rtx *) b;
3369 if (x->mode != y->mode)
3371 return rtx_equal_p (x->constant, y->constant);
3374 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3377 const_rtx_hash_1 (rtx *xp, void *data)
3379 unsigned HOST_WIDE_INT hwi;
3380 enum machine_mode mode;
3386 code = GET_CODE (x);
3387 mode = GET_MODE (x);
3388 h = (hashval_t) code * 1048573 + mode;
3396 int shift = sizeof (hashval_t) * CHAR_BIT;
3397 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3400 h ^= (hashval_t) hwi;
3401 for (i = 1; i < n; ++i)
3404 h ^= (hashval_t) hwi;
3410 if (mode == VOIDmode)
3412 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3416 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3420 h ^= fixed_hash (CONST_FIXED_VALUE (x));
3426 for (i = XVECLEN (x, 0); i-- > 0; )
3427 h = h * 251 + const_rtx_hash_1 (&XVECEXP (x, 0, i), data);
3432 h ^= htab_hash_string (XSTR (x, 0));
3436 h = h * 251 + CODE_LABEL_NUMBER (XEXP (x, 0));
3440 case UNSPEC_VOLATILE:
3441 h = h * 251 + XINT (x, 1);
3448 hp = (hashval_t *) data;
3449 *hp = *hp * 509 + h;
3453 /* Compute a hash value for X, which should be a constant. */
3456 const_rtx_hash (rtx x)
3459 for_each_rtx (&x, const_rtx_hash_1, &h);
3464 /* Create and return a new rtx constant pool. */
3466 static struct rtx_constant_pool *
3467 create_constant_pool (void)
3469 struct rtx_constant_pool *pool;
3471 pool = ggc_alloc_rtx_constant_pool ();
3472 pool->const_rtx_htab = htab_create_ggc (31, const_desc_rtx_hash,
3473 const_desc_rtx_eq, NULL);
3480 /* Initialize constant pool hashing for a new function. */
3483 init_varasm_status (void)
3485 crtl->varasm.pool = create_constant_pool ();
3486 crtl->varasm.deferred_constants = 0;
3489 /* Given a MINUS expression, simplify it if both sides
3490 include the same symbol. */
3493 simplify_subtraction (rtx x)
3495 rtx r = simplify_rtx (x);
3499 /* Given a constant rtx X, make (or find) a memory constant for its value
3500 and return a MEM rtx to refer to it in memory. */
3503 force_const_mem (enum machine_mode mode, rtx x)
3505 struct constant_descriptor_rtx *desc, tmp;
3506 struct rtx_constant_pool *pool;
3513 /* If we're not allowed to drop X into the constant pool, don't. */
3514 if (targetm.cannot_force_const_mem (mode, x))
3517 /* Record that this function has used a constant pool entry. */
3518 crtl->uses_const_pool = 1;
3520 /* Decide which pool to use. */
3521 pool = (targetm.use_blocks_for_constant_p (mode, x)
3522 ? shared_constant_pool
3523 : crtl->varasm.pool);
3525 /* Lookup the value in the hashtable. */
3528 hash = const_rtx_hash (x);
3529 slot = htab_find_slot_with_hash (pool->const_rtx_htab, &tmp, hash, INSERT);
3530 desc = (struct constant_descriptor_rtx *) *slot;
3532 /* If the constant was already present, return its memory. */
3534 return copy_rtx (desc->mem);
3536 /* Otherwise, create a new descriptor. */
3537 desc = ggc_alloc_constant_descriptor_rtx ();
3540 /* Align the location counter as required by EXP's data type. */
3541 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3542 #ifdef CONSTANT_ALIGNMENT
3544 tree type = lang_hooks.types.type_for_mode (mode, 0);
3545 if (type != NULL_TREE)
3546 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3550 pool->offset += (align / BITS_PER_UNIT) - 1;
3551 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3554 desc->constant = copy_rtx (tmp.constant);
3555 desc->offset = pool->offset;
3558 desc->align = align;
3559 desc->labelno = const_labelno;
3562 pool->offset += GET_MODE_SIZE (mode);
3564 pool->last->next = desc;
3566 pool->first = pool->last = desc;
3569 /* Create a string containing the label name, in LABEL. */
3570 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3573 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3574 the constants pool. */
3575 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3577 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3578 symbol = create_block_symbol (ggc_strdup (label),
3579 get_block_for_section (sect), -1);
3582 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3584 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3585 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3586 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3588 /* Construct the MEM. */
3589 desc->mem = def = gen_const_mem (mode, symbol);
3590 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3591 set_mem_align (def, align);
3593 /* If we're dropping a label to the constant pool, make sure we
3595 if (GET_CODE (x) == LABEL_REF)
3596 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3598 return copy_rtx (def);
3601 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3604 get_pool_constant (rtx addr)
3606 return SYMBOL_REF_CONSTANT (addr)->constant;
3609 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3610 and whether it has been output or not. */
3613 get_pool_constant_mark (rtx addr, bool *pmarked)
3615 struct constant_descriptor_rtx *desc;
3617 desc = SYMBOL_REF_CONSTANT (addr);
3618 *pmarked = (desc->mark != 0);
3619 return desc->constant;
3622 /* Similar, return the mode. */
3625 get_pool_mode (const_rtx addr)
3627 return SYMBOL_REF_CONSTANT (addr)->mode;
3630 /* Return the size of the constant pool. */
3633 get_pool_size (void)
3635 return crtl->varasm.pool->offset;
3638 /* Worker function for output_constant_pool_1. Emit assembly for X
3639 in MODE with known alignment ALIGN. */
3642 output_constant_pool_2 (enum machine_mode mode, rtx x, unsigned int align)
3644 switch (GET_MODE_CLASS (mode))
3647 case MODE_DECIMAL_FLOAT:
3651 gcc_assert (GET_CODE (x) == CONST_DOUBLE);
3652 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
3653 assemble_real (r, mode, align);
3658 case MODE_PARTIAL_INT:
3663 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3666 case MODE_VECTOR_FLOAT:
3667 case MODE_VECTOR_INT:
3668 case MODE_VECTOR_FRACT:
3669 case MODE_VECTOR_UFRACT:
3670 case MODE_VECTOR_ACCUM:
3671 case MODE_VECTOR_UACCUM:
3674 enum machine_mode submode = GET_MODE_INNER (mode);
3675 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3677 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3678 units = CONST_VECTOR_NUNITS (x);
3680 for (i = 0; i < units; i++)
3682 rtx elt = CONST_VECTOR_ELT (x, i);
3683 output_constant_pool_2 (submode, elt, i ? subalign : align);
3693 /* Worker function for output_constant_pool. Emit constant DESC,
3694 giving it ALIGN bits of alignment. */
3697 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3704 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3705 whose CODE_LABEL has been deleted. This can occur if a jump table
3706 is eliminated by optimization. If so, write a constant of zero
3707 instead. Note that this can also happen by turning the
3708 CODE_LABEL into a NOTE. */
3709 /* ??? This seems completely and utterly wrong. Certainly it's
3710 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3711 functioning even with INSN_DELETED_P and friends. */
3714 switch (GET_CODE (tmp))
3717 if (GET_CODE (XEXP (tmp, 0)) != PLUS
3718 || GET_CODE (XEXP (XEXP (tmp, 0), 0)) != LABEL_REF)
3720 tmp = XEXP (XEXP (tmp, 0), 0);
3724 tmp = XEXP (tmp, 0);
3725 gcc_assert (!INSN_DELETED_P (tmp));
3726 gcc_assert (!NOTE_P (tmp)
3727 || NOTE_KIND (tmp) != NOTE_INSN_DELETED);
3734 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3735 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3736 align, desc->labelno, done);
3739 assemble_align (align);
3741 /* Output the label. */
3742 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3744 /* Output the data. */
3745 output_constant_pool_2 (desc->mode, x, align);
3747 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3748 sections have proper size. */
3749 if (align > GET_MODE_BITSIZE (desc->mode)
3751 && (in_section->common.flags & SECTION_MERGE))
3752 assemble_align (align);
3754 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3760 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3761 to as used. Emit referenced deferred strings. This function can
3762 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3765 mark_constant (rtx *current_rtx, void *data ATTRIBUTE_UNUSED)
3767 rtx x = *current_rtx;
3769 if (x == NULL_RTX || GET_CODE (x) != SYMBOL_REF)
3772 if (CONSTANT_POOL_ADDRESS_P (x))
3774 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3775 if (desc->mark == 0)
3778 for_each_rtx (&desc->constant, mark_constant, NULL);
3781 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3783 tree decl = SYMBOL_REF_DECL (x);
3784 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl)))
3786 n_deferred_constants--;
3787 output_constant_def_contents (x);
3794 /* Look through appropriate parts of INSN, marking all entries in the
3795 constant pool which are actually being used. Entries that are only
3796 referenced by other constants are also marked as used. Emit
3797 deferred strings that are used. */
3800 mark_constants (rtx insn)
3805 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3806 insns, not any notes that may be attached. We don't want to mark
3807 a constant just because it happens to appear in a REG_EQUIV note. */
3808 if (GET_CODE (PATTERN (insn)) == SEQUENCE)
3810 rtx seq = PATTERN (insn);
3811 int i, n = XVECLEN (seq, 0);
3812 for (i = 0; i < n; ++i)
3814 rtx subinsn = XVECEXP (seq, 0, i);
3815 if (INSN_P (subinsn))
3816 for_each_rtx (&PATTERN (subinsn), mark_constant, NULL);
3820 for_each_rtx (&PATTERN (insn), mark_constant, NULL);
3823 /* Look through the instructions for this function, and mark all the
3824 entries in POOL which are actually being used. Emit deferred constants
3825 which have indeed been used. */
3828 mark_constant_pool (void)
3832 if (!crtl->uses_const_pool && n_deferred_constants == 0)
3835 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3836 mark_constants (insn);
3838 for (link = crtl->epilogue_delay_list;
3840 link = XEXP (link, 1))
3841 mark_constants (XEXP (link, 0));
3844 /* Write all the constants in POOL. */
3847 output_constant_pool_contents (struct rtx_constant_pool *pool)
3849 struct constant_descriptor_rtx *desc;
3851 for (desc = pool->first; desc ; desc = desc->next)
3854 /* If the constant is part of an object_block, make sure that
3855 the constant has been positioned within its block, but do not
3856 write out its definition yet. output_object_blocks will do
3858 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc->sym)
3859 && SYMBOL_REF_BLOCK (desc->sym))
3860 place_block_symbol (desc->sym);
3863 switch_to_section (targetm.asm_out.select_rtx_section
3864 (desc->mode, desc->constant, desc->align));
3865 output_constant_pool_1 (desc, desc->align);
3870 /* Mark all constants that are used in the current function, then write
3871 out the function's private constant pool. */
3874 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
3875 tree fndecl ATTRIBUTE_UNUSED)
3877 struct rtx_constant_pool *pool = crtl->varasm.pool;
3879 /* It is possible for gcc to call force_const_mem and then to later
3880 discard the instructions which refer to the constant. In such a
3881 case we do not need to output the constant. */
3882 mark_constant_pool ();
3884 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3885 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
3888 output_constant_pool_contents (pool);
3890 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3891 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
3895 /* Write the contents of the shared constant pool. */
3898 output_shared_constant_pool (void)
3900 output_constant_pool_contents (shared_constant_pool);
3903 /* Determine what kind of relocations EXP may need. */
3906 compute_reloc_for_constant (tree exp)
3908 int reloc = 0, reloc2;
3911 switch (TREE_CODE (exp))
3915 /* Go inside any operations that get_inner_reference can handle and see
3916 if what's inside is a constant: no need to do anything here for
3917 addresses of variables or functions. */
3918 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3919 tem = TREE_OPERAND (tem, 0))
3922 if (TREE_PUBLIC (tem))
3929 case POINTER_PLUS_EXPR:
3930 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3931 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3935 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3936 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3937 /* The difference of two local labels is computable at link time. */
3938 if (reloc == 1 && reloc2 == 1)
3945 case VIEW_CONVERT_EXPR:
3946 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3951 unsigned HOST_WIDE_INT idx;
3952 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3954 reloc |= compute_reloc_for_constant (tem);
3964 /* Find all the constants whose addresses are referenced inside of EXP,
3965 and make sure assembler code with a label has been output for each one.
3966 Indicate whether an ADDR_EXPR has been encountered. */
3969 output_addressed_constants (tree exp)
3973 switch (TREE_CODE (exp))
3977 /* Go inside any operations that get_inner_reference can handle and see
3978 if what's inside is a constant: no need to do anything here for
3979 addresses of variables or functions. */
3980 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3981 tem = TREE_OPERAND (tem, 0))
3984 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3985 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
3986 tem = DECL_INITIAL (tem);
3988 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
3989 output_constant_def (tem, 0);
3993 case POINTER_PLUS_EXPR:
3995 output_addressed_constants (TREE_OPERAND (exp, 1));
3999 case VIEW_CONVERT_EXPR:
4000 output_addressed_constants (TREE_OPERAND (exp, 0));
4005 unsigned HOST_WIDE_INT idx;
4006 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
4008 output_addressed_constants (tem);
4017 /* Whether a constructor CTOR is a valid static constant initializer if all
4018 its elements are. This used to be internal to initializer_constant_valid_p
4019 and has been exposed to let other functions like categorize_ctor_elements
4020 evaluate the property while walking a constructor for other purposes. */
4023 constructor_static_from_elts_p (const_tree ctor)
4025 return (TREE_CONSTANT (ctor)
4026 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
4027 || TREE_CODE (TREE_TYPE (ctor)) == RECORD_TYPE
4028 || TREE_CODE (TREE_TYPE (ctor)) == ARRAY_TYPE));
4031 static tree initializer_constant_valid_p_1 (tree value, tree endtype,
4034 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4035 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4036 which are valid when ENDTYPE is an integer of any size; in
4037 particular, this does not accept a pointer minus a constant. This
4038 returns null_pointer_node if the VALUE is an absolute constant
4039 which can be used to initialize a static variable. Otherwise it
4043 narrowing_initializer_constant_valid_p (tree value, tree endtype, tree *cache)
4047 if (!INTEGRAL_TYPE_P (endtype))
4050 op0 = TREE_OPERAND (value, 0);
4051 op1 = TREE_OPERAND (value, 1);
4053 /* Like STRIP_NOPS except allow the operand mode to widen. This
4054 works around a feature of fold that simplifies (int)(p1 - p2) to
4055 ((int)p1 - (int)p2) under the theory that the narrower operation
4058 while (CONVERT_EXPR_P (op0)
4059 || TREE_CODE (op0) == NON_LVALUE_EXPR)
4061 tree inner = TREE_OPERAND (op0, 0);
4062 if (inner == error_mark_node
4063 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4064 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
4065 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4070 while (CONVERT_EXPR_P (op1)
4071 || TREE_CODE (op1) == NON_LVALUE_EXPR)
4073 tree inner = TREE_OPERAND (op1, 0);
4074 if (inner == error_mark_node
4075 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4076 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
4077 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4082 op0 = initializer_constant_valid_p_1 (op0, endtype, cache);
4086 op1 = initializer_constant_valid_p_1 (op1, endtype,
4087 cache ? cache + 2 : NULL);
4088 /* Both initializers must be known. */
4092 && (op0 == null_pointer_node
4093 || TREE_CODE (value) == MINUS_EXPR))
4094 return null_pointer_node;
4096 /* Support differences between labels. */
4097 if (TREE_CODE (op0) == LABEL_DECL
4098 && TREE_CODE (op1) == LABEL_DECL)
4099 return null_pointer_node;
4101 if (TREE_CODE (op0) == STRING_CST
4102 && TREE_CODE (op1) == STRING_CST
4103 && operand_equal_p (op0, op1, 1))
4104 return null_pointer_node;
4110 /* Helper function of initializer_constant_valid_p.
4111 Return nonzero if VALUE is a valid constant-valued expression
4112 for use in initializing a static variable; one that can be an
4113 element of a "constant" initializer.
4115 Return null_pointer_node if the value is absolute;
4116 if it is relocatable, return the variable that determines the relocation.
4117 We assume that VALUE has been folded as much as possible;
4118 therefore, we do not need to check for such things as
4119 arithmetic-combinations of integers.
4121 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4124 initializer_constant_valid_p_1 (tree value, tree endtype, tree *cache)
4128 switch (TREE_CODE (value))
4131 if (constructor_static_from_elts_p (value))
4133 unsigned HOST_WIDE_INT idx;
4135 bool absolute = true;
4137 if (cache && cache[0] == value)
4139 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4142 reloc = initializer_constant_valid_p_1 (elt, TREE_TYPE (elt),
4149 cache[1] = NULL_TREE;
4153 if (reloc != null_pointer_node)
4156 /* For a non-absolute relocation, there is no single
4157 variable that can be "the variable that determines the
4162 cache[1] = absolute ? null_pointer_node : error_mark_node;
4164 return absolute ? null_pointer_node : error_mark_node;
4167 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
4175 return null_pointer_node;
4180 tree op0 = staticp (TREE_OPERAND (value, 0));
4183 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4184 to be a constant, this is old-skool offsetof-like nonsense. */
4185 if (TREE_CODE (op0) == INDIRECT_REF
4186 && TREE_CONSTANT (TREE_OPERAND (op0, 0)))
4187 return null_pointer_node;
4188 /* Taking the address of a nested function involves a trampoline,
4189 unless we don't need or want one. */
4190 if (TREE_CODE (op0) == FUNCTION_DECL
4191 && DECL_STATIC_CHAIN (op0)
4192 && !TREE_NO_TRAMPOLINE (value))
4194 /* "&{...}" requires a temporary to hold the constructed
4196 if (TREE_CODE (op0) == CONSTRUCTOR)
4202 case NON_LVALUE_EXPR:
4203 return initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4206 case VIEW_CONVERT_EXPR:
4208 tree src = TREE_OPERAND (value, 0);
4209 tree src_type = TREE_TYPE (src);
4210 tree dest_type = TREE_TYPE (value);
4212 /* Allow view-conversions from aggregate to non-aggregate type only
4213 if the bit pattern is fully preserved afterwards; otherwise, the
4214 RTL expander won't be able to apply a subsequent transformation
4215 to the underlying constructor. */
4216 if (AGGREGATE_TYPE_P (src_type) && !AGGREGATE_TYPE_P (dest_type))
4218 if (TYPE_MODE (endtype) == TYPE_MODE (dest_type))
4219 return initializer_constant_valid_p_1 (src, endtype, cache);
4224 /* Allow all other kinds of view-conversion. */
4225 return initializer_constant_valid_p_1 (src, endtype, cache);
4230 tree src = TREE_OPERAND (value, 0);
4231 tree src_type = TREE_TYPE (src);
4232 tree dest_type = TREE_TYPE (value);
4234 /* Allow conversions between pointer types, floating-point
4235 types, and offset types. */
4236 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
4237 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
4238 || (TREE_CODE (dest_type) == OFFSET_TYPE
4239 && TREE_CODE (src_type) == OFFSET_TYPE))
4240 return initializer_constant_valid_p_1 (src, endtype, cache);
4242 /* Allow length-preserving conversions between integer types. */
4243 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
4244 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
4245 return initializer_constant_valid_p_1 (src, endtype, cache);
4247 /* Allow conversions between other integer types only if
4249 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
4251 tree inner = initializer_constant_valid_p_1 (src, endtype, cache);
4252 if (inner == null_pointer_node)
4253 return null_pointer_node;
4257 /* Allow (int) &foo provided int is as wide as a pointer. */
4258 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
4259 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
4260 return initializer_constant_valid_p_1 (src, endtype, cache);
4262 /* Likewise conversions from int to pointers, but also allow
4263 conversions from 0. */
4264 if ((POINTER_TYPE_P (dest_type)
4265 || TREE_CODE (dest_type) == OFFSET_TYPE)
4266 && INTEGRAL_TYPE_P (src_type))
4268 if (TREE_CODE (src) == INTEGER_CST
4269 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
4270 return null_pointer_node;
4271 if (integer_zerop (src))
4272 return null_pointer_node;
4273 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
4274 return initializer_constant_valid_p_1 (src, endtype, cache);
4277 /* Allow conversions to struct or union types if the value
4279 if (TREE_CODE (dest_type) == RECORD_TYPE
4280 || TREE_CODE (dest_type) == UNION_TYPE)
4281 return initializer_constant_valid_p_1 (src, endtype, cache);
4285 case POINTER_PLUS_EXPR:
4287 /* Any valid floating-point constants will have been folded by now;
4288 with -frounding-math we hit this with addition of two constants. */
4289 if (TREE_CODE (endtype) == REAL_TYPE)
4291 if (cache && cache[0] == value)
4293 if (! INTEGRAL_TYPE_P (endtype)
4294 || TYPE_PRECISION (endtype) >= TYPE_PRECISION (TREE_TYPE (value)))
4296 tree ncache[4] = { NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE };
4298 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4301 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 1),
4302 endtype, ncache + 2);
4303 /* If either term is absolute, use the other term's relocation. */
4304 if (valid0 == null_pointer_node)
4306 else if (valid1 == null_pointer_node)
4308 /* Support narrowing pointer differences. */
4310 ret = narrowing_initializer_constant_valid_p (value, endtype,
4314 /* Support narrowing pointer differences. */
4315 ret = narrowing_initializer_constant_valid_p (value, endtype, NULL);
4324 if (TREE_CODE (endtype) == REAL_TYPE)
4326 if (cache && cache[0] == value)
4328 if (! INTEGRAL_TYPE_P (endtype)
4329 || TYPE_PRECISION (endtype) >= TYPE_PRECISION (TREE_TYPE (value)))
4331 tree ncache[4] = { NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE };
4333 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4336 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 1),
4337 endtype, ncache + 2);
4338 /* Win if second argument is absolute. */
4339 if (valid1 == null_pointer_node)
4341 /* Win if both arguments have the same relocation.
4342 Then the value is absolute. */
4343 else if (valid0 == valid1 && valid0 != 0)
4344 ret = null_pointer_node;
4345 /* Since GCC guarantees that string constants are unique in the
4346 generated code, a subtraction between two copies of the same
4347 constant string is absolute. */
4348 else if (valid0 && TREE_CODE (valid0) == STRING_CST
4349 && valid1 && TREE_CODE (valid1) == STRING_CST
4350 && operand_equal_p (valid0, valid1, 1))
4351 ret = null_pointer_node;
4352 /* Support narrowing differences. */
4354 ret = narrowing_initializer_constant_valid_p (value, endtype,
4358 /* Support narrowing differences. */
4359 ret = narrowing_initializer_constant_valid_p (value, endtype, NULL);
4374 /* Return nonzero if VALUE is a valid constant-valued expression
4375 for use in initializing a static variable; one that can be an
4376 element of a "constant" initializer.
4378 Return null_pointer_node if the value is absolute;
4379 if it is relocatable, return the variable that determines the relocation.
4380 We assume that VALUE has been folded as much as possible;
4381 therefore, we do not need to check for such things as
4382 arithmetic-combinations of integers. */
4384 initializer_constant_valid_p (tree value, tree endtype)
4386 return initializer_constant_valid_p_1 (value, endtype, NULL);
4389 /* Return true if VALUE is a valid constant-valued expression
4390 for use in initializing a static bit-field; one that can be
4391 an element of a "constant" initializer. */
4394 initializer_constant_valid_for_bitfield_p (tree value)
4396 /* For bitfields we support integer constants or possibly nested aggregates
4398 switch (TREE_CODE (value))
4402 unsigned HOST_WIDE_INT idx;
4405 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4406 if (!initializer_constant_valid_for_bitfield_p (elt))
4414 case VIEW_CONVERT_EXPR:
4415 case NON_LVALUE_EXPR:
4417 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value, 0));
4426 /* output_constructor outer state of relevance in recursive calls, typically
4427 for nested aggregate bitfields. */
4430 unsigned int bit_offset; /* current position in ... */
4431 int byte; /* ... the outer byte buffer. */
4434 static unsigned HOST_WIDE_INT
4435 output_constructor (tree, unsigned HOST_WIDE_INT, unsigned int,
4438 /* Output assembler code for constant EXP to FILE, with no label.
4439 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4440 Assumes output_addressed_constants has been done on EXP already.
4442 Generate exactly SIZE bytes of assembler data, padding at the end
4443 with zeros if necessary. SIZE must always be specified.
4445 SIZE is important for structure constructors,
4446 since trailing members may have been omitted from the constructor.
4447 It is also important for initialization of arrays from string constants
4448 since the full length of the string constant might not be wanted.
4449 It is also needed for initialization of unions, where the initializer's
4450 type is just one member, and that may not be as long as the union.
4452 There a case in which we would fail to output exactly SIZE bytes:
4453 for a structure constructor that wants to produce more than SIZE bytes.
4454 But such constructors will never be generated for any possible input.
4456 ALIGN is the alignment of the data in bits. */
4459 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
4461 enum tree_code code;
4462 unsigned HOST_WIDE_INT thissize;
4464 if (size == 0 || flag_syntax_only)
4467 /* See if we're trying to initialize a pointer in a non-default mode
4468 to the address of some declaration somewhere. If the target says
4469 the mode is valid for pointers, assume the target has a way of
4471 if (TREE_CODE (exp) == NOP_EXPR
4472 && POINTER_TYPE_P (TREE_TYPE (exp))
4473 && targetm.addr_space.valid_pointer_mode
4474 (TYPE_MODE (TREE_TYPE (exp)),
4475 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp)))))
4477 tree saved_type = TREE_TYPE (exp);
4479 /* Peel off any intermediate conversions-to-pointer for valid
4481 while (TREE_CODE (exp) == NOP_EXPR
4482 && POINTER_TYPE_P (TREE_TYPE (exp))
4483 && targetm.addr_space.valid_pointer_mode
4484 (TYPE_MODE (TREE_TYPE (exp)),
4485 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp)))))
4486 exp = TREE_OPERAND (exp, 0);
4488 /* If what we're left with is the address of something, we can
4489 convert the address to the final type and output it that
4491 if (TREE_CODE (exp) == ADDR_EXPR)
4492 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
4493 /* Likewise for constant ints. */
4494 else if (TREE_CODE (exp) == INTEGER_CST)
4495 exp = build_int_cst_wide (saved_type, TREE_INT_CST_LOW (exp),
4496 TREE_INT_CST_HIGH (exp));
4500 /* Eliminate any conversions since we'll be outputting the underlying
4502 while (CONVERT_EXPR_P (exp)
4503 || TREE_CODE (exp) == NON_LVALUE_EXPR
4504 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
4506 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
4507 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
4509 /* Make sure eliminating the conversion is really a no-op, except with
4510 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4511 union types to allow for Ada unchecked unions. */
4512 if (type_size > op_size
4513 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
4514 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
4515 /* Keep the conversion. */
4518 exp = TREE_OPERAND (exp, 0);
4521 code = TREE_CODE (TREE_TYPE (exp));
4522 thissize = int_size_in_bytes (TREE_TYPE (exp));
4524 /* Allow a constructor with no elements for any data type.
4525 This means to fill the space with zeros. */
4526 if (TREE_CODE (exp) == CONSTRUCTOR
4527 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (exp)))
4529 assemble_zeros (size);
4533 if (TREE_CODE (exp) == FDESC_EXPR)
4535 #ifdef ASM_OUTPUT_FDESC
4536 HOST_WIDE_INT part = tree_low_cst (TREE_OPERAND (exp, 1), 0);
4537 tree decl = TREE_OPERAND (exp, 0);
4538 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4545 /* Now output the underlying data. If we've handling the padding, return.
4546 Otherwise, break and ensure SIZE is the size written. */
4553 case REFERENCE_TYPE:
4555 case FIXED_POINT_TYPE:
4556 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
4557 EXPAND_INITIALIZER),
4558 MIN (size, thissize), align, 0))
4559 error ("initializer for integer/fixed-point value is too complicated");
4563 if (TREE_CODE (exp) != REAL_CST)
4564 error ("initializer for floating value is not a floating constant");
4566 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)), align);
4570 output_constant (TREE_REALPART (exp), thissize / 2, align);
4571 output_constant (TREE_IMAGPART (exp), thissize / 2,
4572 min_align (align, BITS_PER_UNIT * (thissize / 2)));
4577 switch (TREE_CODE (exp))
4580 output_constructor (exp, size, align, NULL);
4583 thissize = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp),
4585 assemble_string (TREE_STRING_POINTER (exp), thissize);
4592 unsigned int nalign;
4593 enum machine_mode inner;
4595 inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4596 nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4598 elt_size = GET_MODE_SIZE (inner);
4600 link = TREE_VECTOR_CST_ELTS (exp);
4601 output_constant (TREE_VALUE (link), elt_size, align);
4602 thissize = elt_size;
4603 while ((link = TREE_CHAIN (link)) != NULL)
4605 output_constant (TREE_VALUE (link), elt_size, nalign);
4606 thissize += elt_size;
4617 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4618 output_constructor (exp, size, align, NULL);
4628 if (size > thissize)
4629 assemble_zeros (size - thissize);
4633 /* Subroutine of output_constructor, used for computing the size of
4634 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4635 type with an unspecified upper bound. */
4637 static unsigned HOST_WIDE_INT
4638 array_size_for_constructor (tree val)
4641 unsigned HOST_WIDE_INT cnt;
4642 tree index, value, tmp;
4645 /* This code used to attempt to handle string constants that are not
4646 arrays of single-bytes, but nothing else does, so there's no point in
4648 if (TREE_CODE (val) == STRING_CST)
4649 return TREE_STRING_LENGTH (val);
4651 max_index = NULL_TREE;
4652 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4654 if (TREE_CODE (index) == RANGE_EXPR)
4655 index = TREE_OPERAND (index, 1);
4656 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4660 if (max_index == NULL_TREE)
4663 /* Compute the total number of array elements. */
4664 tmp = TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)));
4665 i = double_int_sub (tree_to_double_int (max_index), tree_to_double_int (tmp));
4666 i = double_int_add (i, double_int_one);
4668 /* Multiply by the array element unit size to find number of bytes. */
4669 i = double_int_mul (i, tree_to_double_int
4670 (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val)))));
4672 gcc_assert (double_int_fits_in_uhwi_p (i));
4676 /* Other datastructures + helpers for output_constructor. */
4678 /* output_constructor local state to support interaction with helpers. */
4682 /* Received arguments. */
4683 tree exp; /* Constructor expression. */
4684 unsigned HOST_WIDE_INT size; /* # bytes to output - pad if necessary. */
4685 unsigned int align; /* Known initial alignment. */
4687 /* Constructor expression data. */
4688 tree type; /* Expression type. */
4689 tree field; /* Current field decl in a record. */
4690 tree min_index; /* Lower bound if specified for an array. */
4692 /* Output processing state. */
4693 HOST_WIDE_INT total_bytes; /* # bytes output so far / current position. */
4694 bool byte_buffer_in_use; /* Whether byte ... */
4695 int byte; /* ... contains part of a bitfield byte yet to
4698 int last_relative_index; /* Implicit or explicit index of the last
4699 array element output within a bitfield. */
4700 /* Current element. */
4701 tree val; /* Current element value. */
4702 tree index; /* Current element index. */
4706 /* Helper for output_constructor. From the current LOCAL state, output a
4707 RANGE_EXPR element. */
4710 output_constructor_array_range (oc_local_state *local)
4712 unsigned HOST_WIDE_INT fieldsize
4713 = int_size_in_bytes (TREE_TYPE (local->type));
4715 HOST_WIDE_INT lo_index
4716 = tree_low_cst (TREE_OPERAND (local->index, 0), 0);
4717 HOST_WIDE_INT hi_index
4718 = tree_low_cst (TREE_OPERAND (local->index, 1), 0);
4719 HOST_WIDE_INT index;
4722 = min_align (local->align, fieldsize * BITS_PER_UNIT);
4724 for (index = lo_index; index <= hi_index; index++)
4726 /* Output the element's initial value. */
4727 if (local->val == NULL_TREE)
4728 assemble_zeros (fieldsize);
4730 output_constant (local->val, fieldsize, align2);
4732 /* Count its size. */
4733 local->total_bytes += fieldsize;
4737 /* Helper for output_constructor. From the current LOCAL state, output a
4738 field element that is not true bitfield or part of an outer one. */
4741 output_constructor_regular_field (oc_local_state *local)
4743 /* Field size and position. Since this structure is static, we know the
4744 positions are constant. */
4745 unsigned HOST_WIDE_INT fieldsize;
4746 HOST_WIDE_INT fieldpos;
4748 unsigned int align2;
4750 if (local->index != NULL_TREE)
4752 double_int idx = double_int_sub (tree_to_double_int (local->index),
4753 tree_to_double_int (local->min_index));
4754 gcc_assert (double_int_fits_in_shwi_p (idx));
4755 fieldpos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local->val)), 1)
4758 else if (local->field != NULL_TREE)
4759 fieldpos = int_byte_position (local->field);
4763 /* Output any buffered-up bit-fields preceding this element. */
4764 if (local->byte_buffer_in_use)
4766 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
4767 local->total_bytes++;
4768 local->byte_buffer_in_use = false;
4771 /* Advance to offset of this element.
4772 Note no alignment needed in an array, since that is guaranteed
4773 if each element has the proper size. */
4774 if ((local->field != NULL_TREE || local->index != NULL_TREE)
4775 && fieldpos != local->total_bytes)
4777 gcc_assert (fieldpos >= local->total_bytes);
4778 assemble_zeros (fieldpos - local->total_bytes);
4779 local->total_bytes = fieldpos;
4782 /* Find the alignment of this element. */
4783 align2 = min_align (local->align, BITS_PER_UNIT * fieldpos);
4785 /* Determine size this element should occupy. */
4790 /* If this is an array with an unspecified upper bound,
4791 the initializer determines the size. */
4792 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4793 but we cannot do this until the deprecated support for
4794 initializing zero-length array members is removed. */
4795 if (TREE_CODE (TREE_TYPE (local->field)) == ARRAY_TYPE
4796 && TYPE_DOMAIN (TREE_TYPE (local->field))
4797 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local->field))))
4799 fieldsize = array_size_for_constructor (local->val);
4800 /* Given a non-empty initialization, this field had
4802 gcc_assert (!fieldsize || !DECL_CHAIN (local->field));
4805 fieldsize = tree_low_cst (DECL_SIZE_UNIT (local->field), 1);
4808 fieldsize = int_size_in_bytes (TREE_TYPE (local->type));
4810 /* Output the element's initial value. */
4811 if (local->val == NULL_TREE)
4812 assemble_zeros (fieldsize);
4814 output_constant (local->val, fieldsize, align2);
4816 /* Count its size. */
4817 local->total_bytes += fieldsize;
4820 /* Helper for output_constructor. From the current LOCAL and OUTER states,
4821 output an element that is a true bitfield or part of an outer one. */
4824 output_constructor_bitfield (oc_local_state *local, oc_outer_state *outer)
4826 /* Bit size of this element. */
4827 HOST_WIDE_INT ebitsize
4829 ? tree_low_cst (DECL_SIZE (local->field), 1)
4830 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local->type)), 1));
4832 /* Relative index of this element if this is an array component. */
4833 HOST_WIDE_INT relative_index
4836 ? (tree_low_cst (local->index, 0)
4837 - tree_low_cst (local->min_index, 0))
4838 : local->last_relative_index + 1)
4841 /* Bit position of this element from the start of the containing
4843 HOST_WIDE_INT constructor_relative_ebitpos
4845 ? int_bit_position (local->field)
4846 : ebitsize * relative_index);
4848 /* Bit position of this element from the start of a possibly ongoing
4849 outer byte buffer. */
4850 HOST_WIDE_INT byte_relative_ebitpos
4851 = ((outer ? outer->bit_offset : 0) + constructor_relative_ebitpos);
4853 /* From the start of a possibly ongoing outer byte buffer, offsets to
4854 the first bit of this element and to the first bit past the end of
4856 HOST_WIDE_INT next_offset = byte_relative_ebitpos;
4857 HOST_WIDE_INT end_offset = byte_relative_ebitpos + ebitsize;
4859 local->last_relative_index = relative_index;
4861 if (local->val == NULL_TREE)
4862 local->val = integer_zero_node;
4864 while (TREE_CODE (local->val) == VIEW_CONVERT_EXPR
4865 || TREE_CODE (local->val) == NON_LVALUE_EXPR)
4866 local->val = TREE_OPERAND (local->val, 0);
4868 if (TREE_CODE (local->val) != INTEGER_CST
4869 && TREE_CODE (local->val) != CONSTRUCTOR)
4871 error ("invalid initial value for member %qE", DECL_NAME (local->field));
4875 /* If this field does not start in this (or, next) byte,
4877 if (next_offset / BITS_PER_UNIT != local->total_bytes)
4879 /* Output remnant of any bit field in previous bytes. */
4880 if (local->byte_buffer_in_use)
4882 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
4883 local->total_bytes++;
4884 local->byte_buffer_in_use = false;
4887 /* If still not at proper byte, advance to there. */
4888 if (next_offset / BITS_PER_UNIT != local->total_bytes)
4890 gcc_assert (next_offset / BITS_PER_UNIT >= local->total_bytes);
4891 assemble_zeros (next_offset / BITS_PER_UNIT - local->total_bytes);
4892 local->total_bytes = next_offset / BITS_PER_UNIT;
4896 /* Set up the buffer if necessary. */
4897 if (!local->byte_buffer_in_use)
4901 local->byte_buffer_in_use = true;
4904 /* If this is nested constructor, recurse passing the bit offset and the
4905 pending data, then retrieve the new pending data afterwards. */
4906 if (TREE_CODE (local->val) == CONSTRUCTOR)
4908 oc_outer_state output_state;
4910 output_state.bit_offset = next_offset % BITS_PER_UNIT;
4911 output_state.byte = local->byte;
4913 += output_constructor (local->val, 0, 0, &output_state);
4914 local->byte = output_state.byte;
4918 /* Otherwise, we must split the element into pieces that fall within
4919 separate bytes, and combine each byte with previous or following
4921 while (next_offset < end_offset)
4925 HOST_WIDE_INT value;
4926 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
4927 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
4929 /* Advance from byte to byte
4930 within this element when necessary. */
4931 while (next_byte != local->total_bytes)
4933 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
4934 local->total_bytes++;
4938 /* Number of bits we can process at once
4939 (all part of the same byte). */
4940 this_time = MIN (end_offset - next_offset,
4941 BITS_PER_UNIT - next_bit);
4942 if (BYTES_BIG_ENDIAN)
4944 /* On big-endian machine, take the most significant bits
4945 first (of the bits that are significant)
4946 and put them into bytes from the most significant end. */
4947 shift = end_offset - next_offset - this_time;
4949 /* Don't try to take a bunch of bits that cross
4950 the word boundary in the INTEGER_CST. We can
4951 only select bits from the LOW or HIGH part
4953 if (shift < HOST_BITS_PER_WIDE_INT
4954 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4956 this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
4957 shift = HOST_BITS_PER_WIDE_INT;
4960 /* Now get the bits from the appropriate constant word. */
4961 if (shift < HOST_BITS_PER_WIDE_INT)
4962 value = TREE_INT_CST_LOW (local->val);
4965 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4966 value = TREE_INT_CST_HIGH (local->val);
4967 shift -= HOST_BITS_PER_WIDE_INT;
4970 /* Get the result. This works only when:
4971 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4972 local->byte |= (((value >> shift)
4973 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4974 << (BITS_PER_UNIT - this_time - next_bit));
4978 /* On little-endian machines,
4979 take first the least significant bits of the value
4980 and pack them starting at the least significant
4981 bits of the bytes. */
4982 shift = next_offset - byte_relative_ebitpos;
4984 /* Don't try to take a bunch of bits that cross
4985 the word boundary in the INTEGER_CST. We can
4986 only select bits from the LOW or HIGH part
4988 if (shift < HOST_BITS_PER_WIDE_INT
4989 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4990 this_time = (HOST_BITS_PER_WIDE_INT - shift);
4992 /* Now get the bits from the appropriate constant word. */
4993 if (shift < HOST_BITS_PER_WIDE_INT)
4994 value = TREE_INT_CST_LOW (local->val);
4997 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4998 value = TREE_INT_CST_HIGH (local->val);
4999 shift -= HOST_BITS_PER_WIDE_INT;
5002 /* Get the result. This works only when:
5003 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5004 local->byte |= (((value >> shift)
5005 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
5009 next_offset += this_time;
5010 local->byte_buffer_in_use = true;
5014 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5015 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5016 caller output state of relevance in recursive invocations. */
5018 static unsigned HOST_WIDE_INT
5019 output_constructor (tree exp, unsigned HOST_WIDE_INT size,
5020 unsigned int align, oc_outer_state * outer)
5022 unsigned HOST_WIDE_INT cnt;
5023 constructor_elt *ce;
5025 oc_local_state local;
5027 /* Setup our local state to communicate with helpers. */
5030 local.align = align;
5032 local.total_bytes = 0;
5033 local.byte_buffer_in_use = outer != NULL;
5034 local.byte = outer ? outer->byte : 0;
5036 local.type = TREE_TYPE (exp);
5038 local.last_relative_index = -1;
5040 local.min_index = NULL_TREE;
5041 if (TREE_CODE (local.type) == ARRAY_TYPE
5042 && TYPE_DOMAIN (local.type) != NULL_TREE)
5043 local.min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (local.type));
5045 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
5047 /* As CE goes through the elements of the constant, FIELD goes through the
5048 structure fields if the constant is a structure. If the constant is a
5049 union, we override this by getting the field from the TREE_LIST element.
5050 But the constant could also be an array. Then FIELD is zero.
5052 There is always a maximum of one element in the chain LINK for unions
5053 (even if the initializer in a source program incorrectly contains
5056 local.field = NULL_TREE;
5057 if (TREE_CODE (local.type) == RECORD_TYPE)
5058 local.field = TYPE_FIELDS (local.type);
5061 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), cnt, ce);
5062 cnt++, local.field = local.field ? DECL_CHAIN (local.field) : 0)
5064 local.val = ce->value;
5065 local.index = NULL_TREE;
5067 /* The element in a union constructor specifies the proper field
5069 if ((TREE_CODE (local.type) == RECORD_TYPE
5070 || TREE_CODE (local.type) == UNION_TYPE
5071 || TREE_CODE (local.type) == QUAL_UNION_TYPE)
5072 && ce->index != NULL_TREE)
5073 local.field = ce->index;
5075 else if (TREE_CODE (local.type) == ARRAY_TYPE)
5076 local.index = ce->index;
5078 if (local.field && flag_verbose_asm)
5079 fprintf (asm_out_file, "%s %s:\n",
5081 DECL_NAME (local.field)
5082 ? IDENTIFIER_POINTER (DECL_NAME (local.field))
5085 /* Eliminate the marker that makes a cast not be an lvalue. */
5086 if (local.val != NULL_TREE)
5087 STRIP_NOPS (local.val);
5089 /* Output the current element, using the appropriate helper ... */
5091 /* For an array slice not part of an outer bitfield. */
5093 && local.index != NULL_TREE
5094 && TREE_CODE (local.index) == RANGE_EXPR)
5095 output_constructor_array_range (&local);
5097 /* For a field that is neither a true bitfield nor part of an outer one,
5098 known to be at least byte aligned and multiple-of-bytes long. */
5100 && (local.field == NULL_TREE
5101 || !CONSTRUCTOR_BITFIELD_P (local.field)))
5102 output_constructor_regular_field (&local);
5104 /* For a true bitfield or part of an outer one. */
5106 output_constructor_bitfield (&local, outer);
5109 /* If we are not at toplevel, save the pending data for our caller.
5110 Otherwise output the pending data and padding zeros as needed. */
5112 outer->byte = local.byte;
5115 if (local.byte_buffer_in_use)
5117 assemble_integer (GEN_INT (local.byte), 1, BITS_PER_UNIT, 1);
5118 local.total_bytes++;
5121 if ((unsigned HOST_WIDE_INT)local.total_bytes < local.size)
5123 assemble_zeros (local.size - local.total_bytes);
5124 local.total_bytes = local.size;
5128 return local.total_bytes;
5131 /* Mark DECL as weak. */
5134 mark_weak (tree decl)
5136 DECL_WEAK (decl) = 1;
5138 if (DECL_RTL_SET_P (decl)
5139 && MEM_P (DECL_RTL (decl))
5140 && XEXP (DECL_RTL (decl), 0)
5141 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
5142 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
5145 /* Merge weak status between NEWDECL and OLDDECL. */
5148 merge_weak (tree newdecl, tree olddecl)
5150 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
5152 if (DECL_WEAK (newdecl) && TARGET_SUPPORTS_WEAK)
5155 /* We put the NEWDECL on the weak_decls list at some point
5156 and OLDDECL as well. Keep just OLDDECL on the list. */
5157 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
5158 if (TREE_VALUE (*pwd) == newdecl)
5160 *pwd = TREE_CHAIN (*pwd);
5167 if (DECL_WEAK (newdecl))
5171 /* NEWDECL is weak, but OLDDECL is not. */
5173 /* If we already output the OLDDECL, we're in trouble; we can't
5174 go back and make it weak. This should never happen in
5175 unit-at-a-time compilation. */
5176 gcc_assert (!TREE_ASM_WRITTEN (olddecl));
5178 /* If we've already generated rtl referencing OLDDECL, we may
5179 have done so in a way that will not function properly with
5180 a weak symbol. Again in unit-at-a-time this should be
5182 gcc_assert (!TREE_USED (olddecl)
5183 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)));
5185 if (TARGET_SUPPORTS_WEAK)
5187 /* We put the NEWDECL on the weak_decls list at some point.
5188 Replace it with the OLDDECL. */
5189 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
5190 if (TREE_VALUE (wd) == newdecl)
5192 TREE_VALUE (wd) = olddecl;
5195 /* We may not find the entry on the list. If NEWDECL is a
5196 weak alias, then we will have already called
5197 globalize_decl to remove the entry; in that case, we do
5198 not need to do anything. */
5201 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5202 mark_weak (olddecl);
5205 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5206 weak. Just update NEWDECL to indicate that it's weak too. */
5207 mark_weak (newdecl);
5210 /* Declare DECL to be a weak symbol. */
5213 declare_weak (tree decl)
5215 gcc_assert (TREE_CODE (decl) != FUNCTION_DECL || !TREE_ASM_WRITTEN (decl));
5216 if (! TREE_PUBLIC (decl))
5217 error ("weak declaration of %q+D must be public", decl);
5218 else if (!TARGET_SUPPORTS_WEAK)
5219 warning (0, "weak declaration of %q+D not supported", decl);
5222 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl)))
5223 DECL_ATTRIBUTES (decl)
5224 = tree_cons (get_identifier ("weak"), NULL, DECL_ATTRIBUTES (decl));
5228 weak_finish_1 (tree decl)
5230 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5231 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5234 if (! TREE_USED (decl))
5237 #ifdef ASM_WEAKEN_DECL
5238 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
5240 #ifdef ASM_WEAKEN_LABEL
5241 ASM_WEAKEN_LABEL (asm_out_file, name);
5243 #ifdef ASM_OUTPUT_WEAK_ALIAS
5245 static bool warn_once = 0;
5248 warning (0, "only weak aliases are supported in this configuration");
5258 /* This TREE_LIST contains weakref targets. */
5260 static GTY(()) tree weakref_targets;
5262 /* Forward declaration. */
5263 static tree find_decl_and_mark_needed (tree decl, tree target);
5265 /* Emit any pending weak declarations. */
5272 for (t = weakref_targets; t; t = TREE_CHAIN (t))
5274 tree alias_decl = TREE_PURPOSE (t);
5275 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
5277 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
5278 /* Remove alias_decl from the weak list, but leave entries for
5279 the target alone. */
5281 #ifndef ASM_OUTPUT_WEAKREF
5282 else if (! TREE_SYMBOL_REFERENCED (target))
5284 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5285 defined, otherwise we and weak_finish_1 would use
5286 different macros. */
5287 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5288 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
5290 tree decl = find_decl_and_mark_needed (alias_decl, target);
5294 decl = build_decl (DECL_SOURCE_LOCATION (alias_decl),
5295 TREE_CODE (alias_decl), target,
5296 TREE_TYPE (alias_decl));
5298 DECL_EXTERNAL (decl) = 1;
5299 TREE_PUBLIC (decl) = 1;
5300 DECL_ARTIFICIAL (decl) = 1;
5301 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
5302 TREE_USED (decl) = 1;
5305 weak_finish_1 (decl);
5314 /* Remove the alias and the target from the pending weak list
5315 so that we do not emit any .weak directives for the former,
5316 nor multiple .weak directives for the latter. */
5317 for (p = &weak_decls; (t2 = *p) ; )
5319 if (TREE_VALUE (t2) == alias_decl
5320 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
5321 *p = TREE_CHAIN (t2);
5323 p = &TREE_CHAIN (t2);
5326 /* Remove other weakrefs to the same target, to speed things up. */
5327 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
5329 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
5330 *p = TREE_CHAIN (t2);
5332 p = &TREE_CHAIN (t2);
5337 for (t = weak_decls; t; t = TREE_CHAIN (t))
5339 tree decl = TREE_VALUE (t);
5341 weak_finish_1 (decl);
5345 /* Emit the assembly bits to indicate that DECL is globally visible. */
5348 globalize_decl (tree decl)
5351 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5352 if (DECL_WEAK (decl))
5354 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
5357 #ifdef ASM_WEAKEN_DECL
5358 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
5360 ASM_WEAKEN_LABEL (asm_out_file, name);
5363 /* Remove this function from the pending weak list so that
5364 we do not emit multiple .weak directives for it. */
5365 for (p = &weak_decls; (t = *p) ; )
5367 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5368 *p = TREE_CHAIN (t);
5370 p = &TREE_CHAIN (t);
5373 /* Remove weakrefs to the same target from the pending weakref
5374 list, for the same reason. */
5375 for (p = &weakref_targets; (t = *p) ; )
5377 if (DECL_ASSEMBLER_NAME (decl)
5378 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5379 *p = TREE_CHAIN (t);
5381 p = &TREE_CHAIN (t);
5388 targetm.asm_out.globalize_decl_name (asm_out_file, decl);
5391 VEC(alias_pair,gc) *alias_pairs;
5393 /* Given an assembly name, find the decl it is associated with. At the
5394 same time, mark it needed for cgraph. */
5397 find_decl_and_mark_needed (tree decl, tree target)
5399 struct cgraph_node *fnode = NULL;
5400 struct varpool_node *vnode = NULL;
5402 if (TREE_CODE (decl) == FUNCTION_DECL)
5404 fnode = cgraph_node_for_asm (target);
5406 vnode = varpool_node_for_asm (target);
5410 vnode = varpool_node_for_asm (target);
5412 fnode = cgraph_node_for_asm (target);
5417 cgraph_mark_needed_node (fnode);
5422 varpool_mark_needed_node (vnode);
5423 vnode->force_output = 1;
5430 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5431 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5432 tree node is DECL to have the value of the tree node TARGET. */
5435 do_assemble_alias (tree decl, tree target)
5437 /* Emulated TLS had better not get this var. */
5438 gcc_assert(!(!targetm.have_tls
5439 && TREE_CODE (decl) == VAR_DECL
5440 && DECL_THREAD_LOCAL_P (decl)));
5442 if (TREE_ASM_WRITTEN (decl))
5445 /* We must force creation of DECL_RTL for debug info generation, even though
5446 we don't use it here. */
5447 make_decl_rtl (decl);
5449 TREE_ASM_WRITTEN (decl) = 1;
5450 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
5452 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5454 ultimate_transparent_alias_target (&target);
5456 if (!TREE_SYMBOL_REFERENCED (target))
5457 weakref_targets = tree_cons (decl, target, weakref_targets);
5459 #ifdef ASM_OUTPUT_WEAKREF
5460 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
5461 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5462 IDENTIFIER_POINTER (target));
5464 if (!TARGET_SUPPORTS_WEAK)
5466 error_at (DECL_SOURCE_LOCATION (decl),
5467 "weakref is not supported in this configuration");
5474 #ifdef ASM_OUTPUT_DEF
5475 /* Make name accessible from other files, if appropriate. */
5477 if (TREE_PUBLIC (decl))
5479 globalize_decl (decl);
5480 maybe_assemble_visibility (decl);
5482 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl)))
5484 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE) && HAVE_GNU_INDIRECT_FUNCTION
5485 ASM_OUTPUT_TYPE_DIRECTIVE
5486 (asm_out_file, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5489 error_at (DECL_SOURCE_LOCATION (decl),
5490 "ifunc is not supported in this configuration");
5494 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5495 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
5497 ASM_OUTPUT_DEF (asm_out_file,
5498 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5499 IDENTIFIER_POINTER (target));
5501 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5506 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5507 # ifdef ASM_WEAKEN_DECL
5508 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
5510 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
5512 /* Remove this function from the pending weak list so that
5513 we do not emit multiple .weak directives for it. */
5514 for (p = &weak_decls; (t = *p) ; )
5515 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5516 *p = TREE_CHAIN (t);
5518 p = &TREE_CHAIN (t);
5520 /* Remove weakrefs to the same target from the pending weakref
5521 list, for the same reason. */
5522 for (p = &weakref_targets; (t = *p) ; )
5524 if (DECL_ASSEMBLER_NAME (decl)
5525 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5526 *p = TREE_CHAIN (t);
5528 p = &TREE_CHAIN (t);
5535 /* Allocate and construct a symbol alias set. */
5537 static symbol_alias_set_t *
5538 symbol_alias_set_create (void)
5540 return pointer_set_create ();
5543 /* Destruct and free a symbol alias set. */
5546 symbol_alias_set_destroy (symbol_alias_set_t *aset)
5548 pointer_set_destroy (aset);
5551 /* Test if a symbol alias set contains a given name. */
5554 symbol_alias_set_contains (const symbol_alias_set_t *aset, tree t)
5556 /* We accept either a DECL or an IDENTIFIER directly. */
5557 if (TREE_CODE (t) != IDENTIFIER_NODE)
5558 t = DECL_ASSEMBLER_NAME (t);
5559 t = targetm.asm_out.mangle_assembler_name (IDENTIFIER_POINTER (t));
5560 return pointer_set_contains (aset, t);
5563 /* Enter a new name into a symbol alias set. */
5566 symbol_alias_set_insert (symbol_alias_set_t *aset, tree t)
5568 /* We accept either a DECL or an IDENTIFIER directly. */
5569 if (TREE_CODE (t) != IDENTIFIER_NODE)
5570 t = DECL_ASSEMBLER_NAME (t);
5571 t = targetm.asm_out.mangle_assembler_name (IDENTIFIER_POINTER (t));
5572 return pointer_set_insert (aset, t);
5575 /* IN_SET_P is a predicate function assuming to be taken
5576 alias_pair->decl, alias_pair->target and DATA arguments.
5578 Compute set of aliases by including everything where TRIVIALLY_VISIBLE
5579 predeicate is true and propagate across aliases such that when
5580 alias DECL is included, its TARGET is included too. */
5582 static symbol_alias_set_t *
5583 propagate_aliases_forward (bool (*in_set_p)
5584 (tree decl, tree target, void *data),
5587 symbol_alias_set_t *set;
5592 set = symbol_alias_set_create ();
5593 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); ++i)
5594 if (in_set_p (p->decl, p->target, data))
5595 symbol_alias_set_insert (set, p->decl);
5599 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); ++i)
5600 if (symbol_alias_set_contains (set, p->decl)
5601 && !symbol_alias_set_insert (set, p->target))
5609 /* Like propagate_aliases_forward but do backward propagation. */
5611 symbol_alias_set_t *
5612 propagate_aliases_backward (bool (*in_set_p)
5613 (tree decl, tree target, void *data),
5616 symbol_alias_set_t *set;
5621 /* We have to compute the set of set nodes including aliases
5623 set = symbol_alias_set_create ();
5624 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); ++i)
5625 if (in_set_p (p->decl, p->target, data))
5626 symbol_alias_set_insert (set, p->target);
5630 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); ++i)
5631 if (symbol_alias_set_contains (set, p->target)
5632 && !symbol_alias_set_insert (set, p->decl))
5639 /* See if the alias is trivially visible. This means
5640 1) alias is expoerted from the unit or
5641 2) alias is used in the code.
5642 We assume that unused cgraph/varpool nodes has been
5644 Used as callback for propagate_aliases. */
5647 trivially_visible_alias (tree decl, tree target ATTRIBUTE_UNUSED,
5648 void *data ATTRIBUTE_UNUSED)
5650 struct cgraph_node *fnode = NULL;
5651 struct varpool_node *vnode = NULL;
5653 if (!TREE_PUBLIC (decl))
5655 if (TREE_CODE (decl) == FUNCTION_DECL)
5656 fnode = cgraph_get_node (decl);
5658 vnode = varpool_get_node (decl);
5659 return vnode || fnode;
5665 /* See if the target of alias is defined in this unit.
5666 Used as callback for propagate_aliases. */
5669 trivially_defined_alias (tree decl ATTRIBUTE_UNUSED,
5671 void *data ATTRIBUTE_UNUSED)
5673 struct cgraph_node *fnode = NULL;
5674 struct varpool_node *vnode = NULL;
5676 fnode = cgraph_node_for_asm (target);
5677 vnode = (fnode == NULL) ? varpool_node_for_asm (target) : NULL;
5678 return (fnode && fnode->analyzed) || (vnode && vnode->finalized);
5681 /* Remove the alias pairing for functions that are no longer in the call
5685 remove_unreachable_alias_pairs (void)
5687 symbol_alias_set_t *visible;
5691 if (alias_pairs == NULL)
5694 /* We have to compute the set of visible nodes including aliases
5696 visible = propagate_aliases_forward (trivially_visible_alias, NULL);
5698 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); )
5700 if (!DECL_EXTERNAL (p->decl)
5701 && !symbol_alias_set_contains (visible, p->decl))
5703 VEC_unordered_remove (alias_pair, alias_pairs, i);
5710 symbol_alias_set_destroy (visible);
5714 /* First pass of completing pending aliases. Make sure that cgraph knows
5715 which symbols will be required. */
5718 finish_aliases_1 (void)
5720 symbol_alias_set_t *defined;
5724 if (alias_pairs == NULL)
5727 /* We have to compute the set of defined nodes including aliases
5729 defined = propagate_aliases_backward (trivially_defined_alias, NULL);
5731 FOR_EACH_VEC_ELT (alias_pair, alias_pairs, i, p)
5735 target_decl = find_decl_and_mark_needed (p->decl, p->target);
5736 if (target_decl == NULL)
5738 if (symbol_alias_set_contains (defined, p->target))
5741 if (! (p->emitted_diags & ALIAS_DIAG_TO_UNDEF)
5742 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5744 error ("%q+D aliased to undefined symbol %qE",
5745 p->decl, p->target);
5746 p->emitted_diags |= ALIAS_DIAG_TO_UNDEF;
5749 else if (! (p->emitted_diags & ALIAS_DIAG_TO_EXTERN)
5750 && DECL_EXTERNAL (target_decl)
5751 /* We use local aliases for C++ thunks to force the tailcall
5752 to bind locally. This is a hack - to keep it working do
5753 the following (which is not strictly correct). */
5754 && (! TREE_CODE (target_decl) == FUNCTION_DECL
5755 || ! DECL_VIRTUAL_P (target_decl))
5756 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5758 error ("%q+D aliased to external symbol %qE",
5759 p->decl, p->target);
5760 p->emitted_diags |= ALIAS_DIAG_TO_EXTERN;
5764 symbol_alias_set_destroy (defined);
5767 /* Second pass of completing pending aliases. Emit the actual assembly.
5768 This happens at the end of compilation and thus it is assured that the
5769 target symbol has been emitted. */
5772 finish_aliases_2 (void)
5777 FOR_EACH_VEC_ELT (alias_pair, alias_pairs, i, p)
5778 do_assemble_alias (p->decl, p->target);
5780 VEC_truncate (alias_pair, alias_pairs, 0);
5783 /* Emit an assembler directive to make the symbol for DECL an alias to
5784 the symbol for TARGET. */
5787 assemble_alias (tree decl, tree target)
5790 bool is_weakref = false;
5792 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5794 tree alias = DECL_ASSEMBLER_NAME (decl);
5798 ultimate_transparent_alias_target (&target);
5800 if (alias == target)
5801 error ("weakref %q+D ultimately targets itself", decl);
5804 #ifndef ASM_OUTPUT_WEAKREF
5805 IDENTIFIER_TRANSPARENT_ALIAS (alias) = 1;
5806 TREE_CHAIN (alias) = target;
5809 if (TREE_PUBLIC (decl))
5810 error ("weakref %q+D must have static linkage", decl);
5814 #if !defined (ASM_OUTPUT_DEF)
5815 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5816 error_at (DECL_SOURCE_LOCATION (decl),
5817 "alias definitions not supported in this configuration");
5820 if (!DECL_WEAK (decl))
5822 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl)))
5823 error_at (DECL_SOURCE_LOCATION (decl),
5824 "ifunc is not supported in this configuration");
5826 error_at (DECL_SOURCE_LOCATION (decl),
5827 "only weak aliases are supported in this configuration");
5833 TREE_USED (decl) = 1;
5835 /* A quirk of the initial implementation of aliases required that the user
5836 add "extern" to all of them. Which is silly, but now historical. Do
5837 note that the symbol is in fact locally defined. */
5839 DECL_EXTERNAL (decl) = 0;
5841 /* Allow aliases to aliases. */
5842 if (TREE_CODE (decl) == FUNCTION_DECL)
5843 cgraph_get_create_node (decl)->alias = true;
5845 varpool_node (decl)->alias = true;
5847 /* If the target has already been emitted, we don't have to queue the
5848 alias. This saves a tad of memory. */
5849 if (cgraph_global_info_ready)
5850 target_decl = find_decl_and_mark_needed (decl, target);
5853 if (target_decl && TREE_ASM_WRITTEN (target_decl))
5854 do_assemble_alias (decl, target);
5857 alias_pair *p = VEC_safe_push (alias_pair, gc, alias_pairs, NULL);
5860 p->emitted_diags = ALIAS_DIAG_NONE;
5864 /* Record and output a table of translations from original function
5865 to its transaction aware clone. Note that tm_pure functions are
5866 considered to be their own clone. */
5868 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map)))
5869 htab_t tm_clone_hash;
5872 record_tm_clone_pair (tree o, tree n)
5874 struct tree_map **slot, *h;
5876 if (tm_clone_hash == NULL)
5877 tm_clone_hash = htab_create_ggc (32, tree_map_hash, tree_map_eq, 0);
5879 h = ggc_alloc_tree_map ();
5880 h->hash = htab_hash_pointer (o);
5884 slot = (struct tree_map **)
5885 htab_find_slot_with_hash (tm_clone_hash, h, h->hash, INSERT);
5890 get_tm_clone_pair (tree o)
5894 struct tree_map *h, in;
5897 in.hash = htab_hash_pointer (o);
5898 h = (struct tree_map *) htab_find_with_hash (tm_clone_hash,
5906 typedef struct tm_alias_pair
5913 DEF_VEC_O(tm_alias_pair);
5914 DEF_VEC_ALLOC_O(tm_alias_pair,heap);
5916 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5917 into a VEC in INFO. */
5920 dump_tm_clone_to_vec (void **slot, void *info)
5922 struct tree_map *map = (struct tree_map *) *slot;
5923 VEC(tm_alias_pair,heap) **tm_alias_pairs
5924 = (VEC(tm_alias_pair, heap) **) info;
5927 p = VEC_safe_push (tm_alias_pair, heap, *tm_alias_pairs, NULL);
5928 p->from = map->base.from;
5930 p->uid = DECL_UID (p->from);
5934 /* Dump the actual pairs to the .tm_clone_table section. */
5937 dump_tm_clone_pairs (VEC(tm_alias_pair,heap) *tm_alias_pairs)
5941 bool switched = false;
5943 FOR_EACH_VEC_ELT (tm_alias_pair, tm_alias_pairs, i, p)
5947 struct cgraph_node *src_n = cgraph_get_node (src);
5948 struct cgraph_node *dst_n = cgraph_get_node (dst);
5950 /* The function ipa_tm_create_version() marks the clone as needed if
5951 the original function was needed. But we also mark the clone as
5952 needed if we ever called the clone indirectly through
5953 TM_GETTMCLONE. If neither of these are true, we didn't generate
5954 a clone, and we didn't call it indirectly... no sense keeping it
5955 in the clone table. */
5956 if (!dst_n || !dst_n->needed)
5959 /* This covers the case where we have optimized the original
5960 function away, and only access the transactional clone. */
5961 if (!src_n || !src_n->needed)
5966 switch_to_section (targetm.asm_out.tm_clone_table_section ());
5967 assemble_align (POINTER_SIZE);
5971 assemble_integer (XEXP (DECL_RTL (src), 0),
5972 POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
5973 assemble_integer (XEXP (DECL_RTL (dst), 0),
5974 POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
5978 /* Provide a default for the tm_clone_table section. */
5981 default_clone_table_section (void)
5983 return get_named_section (NULL, ".tm_clone_table", 3);
5986 /* Helper comparison function for qsorting by the DECL_UID stored in
5987 alias_pair->emitted_diags. */
5990 tm_alias_pair_cmp (const void *x, const void *y)
5992 const tm_alias_pair *p1 = (const tm_alias_pair *) x;
5993 const tm_alias_pair *p2 = (const tm_alias_pair *) y;
5994 if (p1->uid < p2->uid)
5996 if (p1->uid > p2->uid)
6002 finish_tm_clone_pairs (void)
6004 VEC(tm_alias_pair,heap) *tm_alias_pairs = NULL;
6006 if (tm_clone_hash == NULL)
6009 /* We need a determenistic order for the .tm_clone_table, otherwise
6010 we will get bootstrap comparison failures, so dump the hash table
6011 to a vector, sort it, and dump the vector. */
6013 /* Dump the hashtable to a vector. */
6014 htab_traverse_noresize (tm_clone_hash, dump_tm_clone_to_vec,
6015 (void *) &tm_alias_pairs);
6017 VEC_qsort (tm_alias_pair, tm_alias_pairs, tm_alias_pair_cmp);
6020 dump_tm_clone_pairs (tm_alias_pairs);
6022 htab_delete (tm_clone_hash);
6023 tm_clone_hash = NULL;
6024 VEC_free (tm_alias_pair, heap, tm_alias_pairs);
6028 /* Emit an assembler directive to set symbol for DECL visibility to
6029 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
6032 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED,
6033 int vis ATTRIBUTE_UNUSED)
6035 #ifdef HAVE_GAS_HIDDEN
6036 static const char * const visibility_types[] = {
6037 NULL, "protected", "hidden", "internal"
6040 const char *name, *type;
6042 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
6043 type = visibility_types[vis];
6045 fprintf (asm_out_file, "\t.%s\t", type);
6046 assemble_name (asm_out_file, name);
6047 fprintf (asm_out_file, "\n");
6049 warning (OPT_Wattributes, "visibility attribute not supported "
6050 "in this configuration; ignored");
6054 /* A helper function to call assemble_visibility when needed for a decl. */
6057 maybe_assemble_visibility (tree decl)
6059 enum symbol_visibility vis = DECL_VISIBILITY (decl);
6061 if (vis != VISIBILITY_DEFAULT)
6063 targetm.asm_out.assemble_visibility (decl, vis);
6070 /* Returns 1 if the target configuration supports defining public symbols
6071 so that one of them will be chosen at link time instead of generating a
6072 multiply-defined symbol error, whether through the use of weak symbols or
6073 a target-specific mechanism for having duplicates discarded. */
6076 supports_one_only (void)
6078 if (SUPPORTS_ONE_ONLY)
6080 return TARGET_SUPPORTS_WEAK;
6083 /* Set up DECL as a public symbol that can be defined in multiple
6084 translation units without generating a linker error. */
6087 make_decl_one_only (tree decl, tree comdat_group)
6089 gcc_assert (TREE_CODE (decl) == VAR_DECL
6090 || TREE_CODE (decl) == FUNCTION_DECL);
6092 TREE_PUBLIC (decl) = 1;
6094 if (SUPPORTS_ONE_ONLY)
6096 #ifdef MAKE_DECL_ONE_ONLY
6097 MAKE_DECL_ONE_ONLY (decl);
6099 DECL_COMDAT_GROUP (decl) = comdat_group;
6101 else if (TREE_CODE (decl) == VAR_DECL
6102 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
6103 DECL_COMMON (decl) = 1;
6106 gcc_assert (TARGET_SUPPORTS_WEAK);
6107 DECL_WEAK (decl) = 1;
6112 init_varasm_once (void)
6114 section_htab = htab_create_ggc (31, section_entry_hash,
6115 section_entry_eq, NULL);
6116 object_block_htab = htab_create_ggc (31, object_block_entry_hash,
6117 object_block_entry_eq, NULL);
6118 const_desc_htab = htab_create_ggc (1009, const_desc_hash,
6119 const_desc_eq, NULL);
6121 const_alias_set = new_alias_set ();
6122 shared_constant_pool = create_constant_pool ();
6124 #ifdef TEXT_SECTION_ASM_OP
6125 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
6126 TEXT_SECTION_ASM_OP);
6129 #ifdef DATA_SECTION_ASM_OP
6130 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
6131 DATA_SECTION_ASM_OP);
6134 #ifdef SDATA_SECTION_ASM_OP
6135 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
6136 SDATA_SECTION_ASM_OP);
6139 #ifdef READONLY_DATA_SECTION_ASM_OP
6140 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
6141 READONLY_DATA_SECTION_ASM_OP);
6144 #ifdef CTORS_SECTION_ASM_OP
6145 ctors_section = get_unnamed_section (0, output_section_asm_op,
6146 CTORS_SECTION_ASM_OP);
6149 #ifdef DTORS_SECTION_ASM_OP
6150 dtors_section = get_unnamed_section (0, output_section_asm_op,
6151 DTORS_SECTION_ASM_OP);
6154 #ifdef BSS_SECTION_ASM_OP
6155 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
6156 output_section_asm_op,
6157 BSS_SECTION_ASM_OP);
6160 #ifdef SBSS_SECTION_ASM_OP
6161 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
6162 output_section_asm_op,
6163 SBSS_SECTION_ASM_OP);
6166 tls_comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
6167 | SECTION_COMMON, emit_tls_common);
6168 lcomm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
6169 | SECTION_COMMON, emit_local);
6170 comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
6171 | SECTION_COMMON, emit_common);
6173 #if defined ASM_OUTPUT_ALIGNED_BSS
6174 bss_noswitch_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS,
6178 targetm.asm_out.init_sections ();
6180 if (readonly_data_section == NULL)
6181 readonly_data_section = text_section;
6185 decl_default_tls_model (const_tree decl)
6187 enum tls_model kind;
6190 is_local = targetm.binds_local_p (decl);
6194 kind = TLS_MODEL_LOCAL_EXEC;
6196 kind = TLS_MODEL_INITIAL_EXEC;
6199 /* Local dynamic is inefficient when we're not combining the
6200 parts of the address. */
6201 else if (optimize && is_local)
6202 kind = TLS_MODEL_LOCAL_DYNAMIC;
6204 kind = TLS_MODEL_GLOBAL_DYNAMIC;
6205 if (kind < flag_tls_default)
6206 kind = flag_tls_default;
6211 /* Select a set of attributes for section NAME based on the properties
6212 of DECL and whether or not RELOC indicates that DECL's initializer
6213 might contain runtime relocations.
6215 We make the section read-only and executable for a function decl,
6216 read-only for a const data decl, and writable for a non-const data decl. */
6219 default_section_type_flags (tree decl, const char *name, int reloc)
6223 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
6224 flags = SECTION_CODE;
6227 enum section_category category
6228 = categorize_decl_for_section (decl, reloc);
6229 if (decl_readonly_section_1 (category))
6231 else if (category == SECCAT_DATA_REL_RO
6232 || category == SECCAT_DATA_REL_RO_LOCAL)
6233 flags = SECTION_WRITE | SECTION_RELRO;
6235 flags = SECTION_WRITE;
6239 flags = SECTION_WRITE;
6240 if (strcmp (name, ".data.rel.ro") == 0
6241 || strcmp (name, ".data.rel.ro.local") == 0)
6242 flags |= SECTION_RELRO;
6245 if (decl && DECL_ONE_ONLY (decl))
6246 flags |= SECTION_LINKONCE;
6248 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
6249 flags |= SECTION_TLS | SECTION_WRITE;
6251 if (strcmp (name, ".bss") == 0
6252 || strncmp (name, ".bss.", 5) == 0
6253 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
6254 || strcmp (name, ".sbss") == 0
6255 || strncmp (name, ".sbss.", 6) == 0
6256 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
6257 flags |= SECTION_BSS;
6259 if (strcmp (name, ".tdata") == 0
6260 || strncmp (name, ".tdata.", 7) == 0
6261 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
6262 flags |= SECTION_TLS;
6264 if (strcmp (name, ".tbss") == 0
6265 || strncmp (name, ".tbss.", 6) == 0
6266 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
6267 flags |= SECTION_TLS | SECTION_BSS;
6269 /* These three sections have special ELF types. They are neither
6270 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6271 want to print a section type (@progbits or @nobits). If someone
6272 is silly enough to emit code or TLS variables to one of these
6273 sections, then don't handle them specially. */
6274 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
6275 && (strcmp (name, ".init_array") == 0
6276 || strcmp (name, ".fini_array") == 0
6277 || strcmp (name, ".preinit_array") == 0))
6278 flags |= SECTION_NOTYPE;
6283 /* Return true if the target supports some form of global BSS,
6284 either through bss_noswitch_section, or by selecting a BSS
6285 section in TARGET_ASM_SELECT_SECTION. */
6288 have_global_bss_p (void)
6290 return bss_noswitch_section || targetm.have_switchable_bss_sections;
6293 /* Output assembly to switch to section NAME with attribute FLAGS.
6294 Four variants for common object file formats. */
6297 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
6298 unsigned int flags ATTRIBUTE_UNUSED,
6299 tree decl ATTRIBUTE_UNUSED)
6301 /* Some object formats don't support named sections at all. The
6302 front-end should already have flagged this as an error. */
6306 #ifndef TLS_SECTION_ASM_FLAG
6307 #define TLS_SECTION_ASM_FLAG 'T'
6311 default_elf_asm_named_section (const char *name, unsigned int flags,
6312 tree decl ATTRIBUTE_UNUSED)
6314 char flagchars[10], *f = flagchars;
6316 /* If we have already declared this section, we can use an
6317 abbreviated form to switch back to it -- unless this section is
6318 part of a COMDAT groups, in which case GAS requires the full
6319 declaration every time. */
6320 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6321 && (flags & SECTION_DECLARED))
6323 fprintf (asm_out_file, "\t.section\t%s\n", name);
6327 if (!(flags & SECTION_DEBUG))
6329 if (flags & SECTION_EXCLUDE)
6331 if (flags & SECTION_WRITE)
6333 if (flags & SECTION_CODE)
6335 if (flags & SECTION_SMALL)
6337 if (flags & SECTION_MERGE)
6339 if (flags & SECTION_STRINGS)
6341 if (flags & SECTION_TLS)
6342 *f++ = TLS_SECTION_ASM_FLAG;
6343 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6347 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
6349 if (!(flags & SECTION_NOTYPE))
6354 if (flags & SECTION_BSS)
6360 /* On platforms that use "@" as the assembly comment character,
6362 if (strcmp (ASM_COMMENT_START, "@") == 0)
6364 fprintf (asm_out_file, format, type);
6366 if (flags & SECTION_ENTSIZE)
6367 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
6368 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6370 if (TREE_CODE (decl) == IDENTIFIER_NODE)
6371 fprintf (asm_out_file, ",%s,comdat", IDENTIFIER_POINTER (decl));
6373 fprintf (asm_out_file, ",%s,comdat",
6374 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl)));
6378 putc ('\n', asm_out_file);
6382 default_coff_asm_named_section (const char *name, unsigned int flags,
6383 tree decl ATTRIBUTE_UNUSED)
6385 char flagchars[8], *f = flagchars;
6387 if (flags & SECTION_WRITE)
6389 if (flags & SECTION_CODE)
6393 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
6397 default_pe_asm_named_section (const char *name, unsigned int flags,
6400 default_coff_asm_named_section (name, flags, decl);
6402 if (flags & SECTION_LINKONCE)
6404 /* Functions may have been compiled at various levels of
6405 optimization so we can't use `same_size' here.
6406 Instead, have the linker pick one. */
6407 fprintf (asm_out_file, "\t.linkonce %s\n",
6408 (flags & SECTION_CODE ? "discard" : "same_size"));
6412 /* The lame default section selector. */
6415 default_select_section (tree decl, int reloc,
6416 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6420 if (decl_readonly_section (decl, reloc))
6421 return readonly_data_section;
6423 else if (TREE_CODE (decl) == CONSTRUCTOR)
6425 if (! ((flag_pic && reloc)
6426 || !TREE_READONLY (decl)
6427 || TREE_SIDE_EFFECTS (decl)
6428 || !TREE_CONSTANT (decl)))
6429 return readonly_data_section;
6431 else if (TREE_CODE (decl) == STRING_CST)
6432 return readonly_data_section;
6433 else if (! (flag_pic && reloc))
6434 return readonly_data_section;
6436 return data_section;
6439 enum section_category
6440 categorize_decl_for_section (const_tree decl, int reloc)
6442 enum section_category ret;
6444 if (TREE_CODE (decl) == FUNCTION_DECL)
6446 else if (TREE_CODE (decl) == STRING_CST)
6448 if (flag_mudflap) /* or !flag_merge_constants */
6449 return SECCAT_RODATA;
6451 return SECCAT_RODATA_MERGE_STR;
6453 else if (TREE_CODE (decl) == VAR_DECL)
6455 if (bss_initializer_p (decl))
6457 else if (! TREE_READONLY (decl)
6458 || TREE_SIDE_EFFECTS (decl)
6459 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
6461 /* Here the reloc_rw_mask is not testing whether the section should
6462 be read-only or not, but whether the dynamic link will have to
6463 do something. If so, we wish to segregate the data in order to
6464 minimize cache misses inside the dynamic linker. */
6465 if (reloc & targetm.asm_out.reloc_rw_mask ())
6466 ret = reloc == 1 ? SECCAT_DATA_REL_LOCAL : SECCAT_DATA_REL;
6470 else if (reloc & targetm.asm_out.reloc_rw_mask ())
6471 ret = reloc == 1 ? SECCAT_DATA_REL_RO_LOCAL : SECCAT_DATA_REL_RO;
6472 else if (reloc || flag_merge_constants < 2)
6473 /* C and C++ don't allow different variables to share the same
6474 location. -fmerge-all-constants allows even that (at the
6475 expense of not conforming). */
6476 ret = SECCAT_RODATA;
6477 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
6478 ret = SECCAT_RODATA_MERGE_STR_INIT;
6480 ret = SECCAT_RODATA_MERGE_CONST;
6482 else if (TREE_CODE (decl) == CONSTRUCTOR)
6484 if ((reloc & targetm.asm_out.reloc_rw_mask ())
6485 || TREE_SIDE_EFFECTS (decl)
6486 || ! TREE_CONSTANT (decl))
6489 ret = SECCAT_RODATA;
6492 ret = SECCAT_RODATA;
6494 /* There are no read-only thread-local sections. */
6495 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
6497 /* Note that this would be *just* SECCAT_BSS, except that there's
6498 no concept of a read-only thread-local-data section. */
6499 if (ret == SECCAT_BSS
6500 || (flag_zero_initialized_in_bss
6501 && initializer_zerop (DECL_INITIAL (decl))))
6507 /* If the target uses small data sections, select it. */
6508 else if (targetm.in_small_data_p (decl))
6510 if (ret == SECCAT_BSS)
6512 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
6513 ret = SECCAT_SRODATA;
6522 decl_readonly_section_1 (enum section_category category)
6527 case SECCAT_RODATA_MERGE_STR:
6528 case SECCAT_RODATA_MERGE_STR_INIT:
6529 case SECCAT_RODATA_MERGE_CONST:
6530 case SECCAT_SRODATA:
6538 decl_readonly_section (const_tree decl, int reloc)
6540 return decl_readonly_section_1 (categorize_decl_for_section (decl, reloc));
6543 /* Select a section based on the above categorization. */
6546 default_elf_select_section (tree decl, int reloc,
6547 unsigned HOST_WIDE_INT align)
6550 switch (categorize_decl_for_section (decl, reloc))
6553 /* We're not supposed to be called on FUNCTION_DECLs. */
6556 return readonly_data_section;
6557 case SECCAT_RODATA_MERGE_STR:
6558 return mergeable_string_section (decl, align, 0);
6559 case SECCAT_RODATA_MERGE_STR_INIT:
6560 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
6561 case SECCAT_RODATA_MERGE_CONST:
6562 return mergeable_constant_section (DECL_MODE (decl), align, 0);
6563 case SECCAT_SRODATA:
6567 return data_section;
6568 case SECCAT_DATA_REL:
6569 sname = ".data.rel";
6571 case SECCAT_DATA_REL_LOCAL:
6572 sname = ".data.rel.local";
6574 case SECCAT_DATA_REL_RO:
6575 sname = ".data.rel.ro";
6577 case SECCAT_DATA_REL_RO_LOCAL:
6578 sname = ".data.rel.ro.local";
6603 return get_named_section (decl, sname, reloc);
6606 /* Construct a unique section name based on the decl name and the
6607 categorization performed above. */
6610 default_unique_section (tree decl, int reloc)
6612 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6613 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
6614 const char *prefix, *name, *linkonce;
6617 switch (categorize_decl_for_section (decl, reloc))
6620 prefix = one_only ? ".t" : ".text";
6623 case SECCAT_RODATA_MERGE_STR:
6624 case SECCAT_RODATA_MERGE_STR_INIT:
6625 case SECCAT_RODATA_MERGE_CONST:
6626 prefix = one_only ? ".r" : ".rodata";
6628 case SECCAT_SRODATA:
6629 prefix = one_only ? ".s2" : ".sdata2";
6632 prefix = one_only ? ".d" : ".data";
6634 case SECCAT_DATA_REL:
6635 prefix = one_only ? ".d.rel" : ".data.rel";
6637 case SECCAT_DATA_REL_LOCAL:
6638 prefix = one_only ? ".d.rel.local" : ".data.rel.local";
6640 case SECCAT_DATA_REL_RO:
6641 prefix = one_only ? ".d.rel.ro" : ".data.rel.ro";
6643 case SECCAT_DATA_REL_RO_LOCAL:
6644 prefix = one_only ? ".d.rel.ro.local" : ".data.rel.ro.local";
6647 prefix = one_only ? ".s" : ".sdata";
6650 prefix = one_only ? ".b" : ".bss";
6653 prefix = one_only ? ".sb" : ".sbss";
6656 prefix = one_only ? ".td" : ".tdata";
6659 prefix = one_only ? ".tb" : ".tbss";
6665 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
6666 name = targetm.strip_name_encoding (name);
6668 /* If we're using one_only, then there needs to be a .gnu.linkonce
6669 prefix to the section name. */
6670 linkonce = one_only ? ".gnu.linkonce" : "";
6672 string = ACONCAT ((linkonce, prefix, ".", name, NULL));
6674 DECL_SECTION_NAME (decl) = build_string (strlen (string), string);
6677 /* Like compute_reloc_for_constant, except for an RTX. The return value
6678 is a mask for which bit 1 indicates a global relocation, and bit 0
6679 indicates a local relocation. */
6682 compute_reloc_for_rtx_1 (rtx *xp, void *data)
6684 int *preloc = (int *) data;
6687 switch (GET_CODE (x))
6690 *preloc |= SYMBOL_REF_LOCAL_P (x) ? 1 : 2;
6703 compute_reloc_for_rtx (rtx x)
6707 switch (GET_CODE (x))
6713 for_each_rtx (&x, compute_reloc_for_rtx_1, &reloc);
6722 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED,
6724 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6726 if (compute_reloc_for_rtx (x) & targetm.asm_out.reloc_rw_mask ())
6727 return data_section;
6729 return readonly_data_section;
6733 default_elf_select_rtx_section (enum machine_mode mode, rtx x,
6734 unsigned HOST_WIDE_INT align)
6736 int reloc = compute_reloc_for_rtx (x);
6738 /* ??? Handle small data here somehow. */
6740 if (reloc & targetm.asm_out.reloc_rw_mask ())
6743 return get_named_section (NULL, ".data.rel.ro.local", 1);
6745 return get_named_section (NULL, ".data.rel.ro", 3);
6748 return mergeable_constant_section (mode, align, 0);
6751 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6754 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
6759 /* Careful not to prod global register variables. */
6762 symbol = XEXP (rtl, 0);
6763 if (GET_CODE (symbol) != SYMBOL_REF)
6766 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_HAS_BLOCK_INFO;
6767 if (TREE_CODE (decl) == FUNCTION_DECL)
6768 flags |= SYMBOL_FLAG_FUNCTION;
6769 if (targetm.binds_local_p (decl))
6770 flags |= SYMBOL_FLAG_LOCAL;
6771 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
6772 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
6773 else if (targetm.in_small_data_p (decl))
6774 flags |= SYMBOL_FLAG_SMALL;
6775 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6776 being PUBLIC, the thing *must* be defined in this translation unit.
6777 Prevent this buglet from being propagated into rtl code as well. */
6778 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
6779 flags |= SYMBOL_FLAG_EXTERNAL;
6781 SYMBOL_REF_FLAGS (symbol) = flags;
6784 /* By default, we do nothing for encode_section_info, so we need not
6785 do anything but discard the '*' marker. */
6788 default_strip_name_encoding (const char *str)
6790 return str + (*str == '*');
6793 #ifdef ASM_OUTPUT_DEF
6794 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6795 anchor relative to ".", the current section position. */
6798 default_asm_output_anchor (rtx symbol)
6802 sprintf (buffer, "*. + " HOST_WIDE_INT_PRINT_DEC,
6803 SYMBOL_REF_BLOCK_OFFSET (symbol));
6804 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
6808 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6811 default_use_anchors_for_symbol_p (const_rtx symbol)
6816 /* Don't use anchors for mergeable sections. The linker might move
6817 the objects around. */
6818 sect = SYMBOL_REF_BLOCK (symbol)->sect;
6819 if (sect->common.flags & SECTION_MERGE)
6822 /* Don't use anchors for small data sections. The small data register
6823 acts as an anchor for such sections. */
6824 if (sect->common.flags & SECTION_SMALL)
6827 decl = SYMBOL_REF_DECL (symbol);
6828 if (decl && DECL_P (decl))
6830 /* Don't use section anchors for decls that might be defined by
6832 if (!targetm.binds_local_p (decl))
6835 /* Don't use section anchors for decls that will be placed in a
6836 small data section. */
6837 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6838 one above. The problem is that we only use SECTION_SMALL for
6839 sections that should be marked as small in the section directive. */
6840 if (targetm.in_small_data_p (decl))
6846 /* Return true when RESOLUTION indicate that symbol will be bound to the
6847 definition provided by current .o file. */
6850 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution)
6852 return (resolution == LDPR_PREVAILING_DEF
6853 || resolution == LDPR_PREVAILING_DEF_IRONLY_EXP
6854 || resolution == LDPR_PREVAILING_DEF_IRONLY);
6857 /* Return true when RESOLUTION indicate that symbol will be bound locally
6858 within current executable or DSO. */
6861 resolution_local_p (enum ld_plugin_symbol_resolution resolution)
6863 return (resolution == LDPR_PREVAILING_DEF
6864 || resolution == LDPR_PREVAILING_DEF_IRONLY
6865 || resolution == LDPR_PREVAILING_DEF_IRONLY_EXP
6866 || resolution == LDPR_PREEMPTED_REG
6867 || resolution == LDPR_PREEMPTED_IR
6868 || resolution == LDPR_RESOLVED_IR
6869 || resolution == LDPR_RESOLVED_EXEC);
6872 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6873 wrt cross-module name binding. */
6876 default_binds_local_p (const_tree exp)
6878 return default_binds_local_p_1 (exp, flag_shlib);
6882 default_binds_local_p_1 (const_tree exp, int shlib)
6885 bool resolved_locally = false;
6886 bool resolved_to_local_def = false;
6888 /* With resolution file in hands, take look into resolutions.
6889 We can't just return true for resolved_locally symbols,
6890 because dynamic linking might overwrite symbols
6891 in shared libraries. */
6892 if (TREE_CODE (exp) == VAR_DECL && TREE_PUBLIC (exp)
6893 && (TREE_STATIC (exp) || DECL_EXTERNAL (exp)))
6895 struct varpool_node *vnode = varpool_get_node (exp);
6896 if (vnode && resolution_local_p (vnode->resolution))
6897 resolved_locally = true;
6899 && resolution_to_local_definition_p (vnode->resolution))
6900 resolved_to_local_def = true;
6902 else if (TREE_CODE (exp) == FUNCTION_DECL && TREE_PUBLIC (exp))
6904 struct cgraph_node *node = cgraph_get_node (exp);
6906 && resolution_local_p (node->resolution))
6907 resolved_locally = true;
6909 && resolution_to_local_definition_p (node->resolution))
6910 resolved_to_local_def = true;
6913 /* A non-decl is an entry in the constant pool. */
6916 /* Weakrefs may not bind locally, even though the weakref itself is
6917 always static and therefore local.
6918 FIXME: We can resolve this more curefuly by looking at the weakref
6920 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp)))
6922 /* Static variables are always local. */
6923 else if (! TREE_PUBLIC (exp))
6925 /* A variable is local if the user has said explicitly that it will
6927 else if ((DECL_VISIBILITY_SPECIFIED (exp)
6928 || resolved_to_local_def)
6929 && DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6931 /* Variables defined outside this object might not be local. */
6932 else if (DECL_EXTERNAL (exp) && !resolved_locally)
6934 /* If defined in this object and visibility is not default, must be
6936 else if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6938 /* Default visibility weak data can be overridden by a strong symbol
6939 in another module and so are not local. */
6940 else if (DECL_WEAK (exp)
6941 && !resolved_locally)
6943 /* If PIC, then assume that any global name can be overridden by
6944 symbols resolved from other modules. */
6947 /* Uninitialized COMMON variable may be unified with symbols
6948 resolved from other modules. */
6949 else if (DECL_COMMON (exp)
6950 && !resolved_locally
6951 && (DECL_INITIAL (exp) == NULL
6952 || DECL_INITIAL (exp) == error_mark_node))
6954 /* Otherwise we're left with initialized (or non-common) global data
6955 which is of necessity defined locally. */
6962 /* Return true when references to DECL must bind to current definition in
6965 The condition is usually equivalent to whether the function binds to the
6966 current module (shared library or executable), that is to binds_local_p.
6967 We use this fact to avoid need for another target hook and implement
6968 the logic using binds_local_p and just special cases where
6969 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6970 the weak definitions (that can be overwritten at linktime by other
6971 definition from different object file) and when resolution info is available
6972 we simply use the knowledge passed to us by linker plugin. */
6974 decl_binds_to_current_def_p (tree decl)
6976 gcc_assert (DECL_P (decl));
6977 if (!TREE_PUBLIC (decl))
6979 if (!targetm.binds_local_p (decl))
6981 /* When resolution is available, just use it. */
6982 if (TREE_CODE (decl) == VAR_DECL
6983 && (TREE_STATIC (decl) || DECL_EXTERNAL (decl)))
6985 struct varpool_node *vnode = varpool_get_node (decl);
6987 && vnode->resolution != LDPR_UNKNOWN)
6988 return resolution_to_local_definition_p (vnode->resolution);
6990 else if (TREE_CODE (decl) == FUNCTION_DECL)
6992 struct cgraph_node *node = cgraph_get_node (decl);
6994 && node->resolution != LDPR_UNKNOWN)
6995 return resolution_to_local_definition_p (node->resolution);
6997 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6998 binds locally but still can be overwritten).
6999 This rely on fact that binds_local_p behave as decl_replaceable_p
7000 for all other declaration types. */
7001 return !DECL_WEAK (decl);
7004 /* A replaceable function or variable is one which may be replaced
7005 at link-time with an entirely different definition, provided that the
7006 replacement has the same type. For example, functions declared
7007 with __attribute__((weak)) on most systems are replaceable.
7009 COMDAT functions are not replaceable, since all definitions of the
7010 function must be equivalent. It is important that COMDAT functions
7011 not be treated as replaceable so that use of C++ template
7012 instantiations is not penalized. */
7015 decl_replaceable_p (tree decl)
7017 gcc_assert (DECL_P (decl));
7018 if (!TREE_PUBLIC (decl) || DECL_COMDAT (decl))
7020 return !decl_binds_to_current_def_p (decl);
7023 /* Default function to output code that will globalize a label. A
7024 target must define GLOBAL_ASM_OP or provide its own function to
7025 globalize a label. */
7026 #ifdef GLOBAL_ASM_OP
7028 default_globalize_label (FILE * stream, const char *name)
7030 fputs (GLOBAL_ASM_OP, stream);
7031 assemble_name (stream, name);
7032 putc ('\n', stream);
7034 #endif /* GLOBAL_ASM_OP */
7036 /* Default function to output code that will globalize a declaration. */
7038 default_globalize_decl_name (FILE * stream, tree decl)
7040 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
7041 targetm.asm_out.globalize_label (stream, name);
7044 /* Default function to output a label for unwind information. The
7045 default is to do nothing. A target that needs nonlocal labels for
7046 unwind information must provide its own function to do this. */
7048 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
7049 tree decl ATTRIBUTE_UNUSED,
7050 int for_eh ATTRIBUTE_UNUSED,
7051 int empty ATTRIBUTE_UNUSED)
7055 /* Default function to output a label to divide up the exception table.
7056 The default is to do nothing. A target that needs/wants to divide
7057 up the table must provide it's own function to do this. */
7059 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
7063 /* This is how to output an internal numbered label where PREFIX is
7064 the class of label and LABELNO is the number within the class. */
7067 default_generate_internal_label (char *buf, const char *prefix,
7068 unsigned long labelno)
7070 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
7073 /* This is how to output an internal numbered label where PREFIX is
7074 the class of label and LABELNO is the number within the class. */
7077 default_internal_label (FILE *stream, const char *prefix,
7078 unsigned long labelno)
7080 char *const buf = (char *) alloca (40 + strlen (prefix));
7081 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
7082 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
7086 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7089 default_asm_declare_constant_name (FILE *file, const char *name,
7090 const_tree exp ATTRIBUTE_UNUSED,
7091 HOST_WIDE_INT size ATTRIBUTE_UNUSED)
7093 assemble_label (file, name);
7096 /* This is the default behavior at the beginning of a file. It's
7097 controlled by two other target-hook toggles. */
7099 default_file_start (void)
7101 if (targetm.asm_file_start_app_off
7102 && !(flag_verbose_asm || flag_debug_asm || flag_dump_rtl_in_asm))
7103 fputs (ASM_APP_OFF, asm_out_file);
7105 if (targetm.asm_file_start_file_directive)
7106 output_file_directive (asm_out_file, main_input_filename);
7109 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7110 which emits a special section directive used to indicate whether or
7111 not this object file needs an executable stack. This is primarily
7112 a GNU extension to ELF but could be used on other targets. */
7114 int trampolines_created;
7117 file_end_indicate_exec_stack (void)
7119 unsigned int flags = SECTION_DEBUG;
7120 if (trampolines_created)
7121 flags |= SECTION_CODE;
7123 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
7126 /* Emit a special section directive to indicate that this object file
7127 was compiled with -fsplit-stack. This is used to let the linker
7128 detect calls between split-stack code and non-split-stack code, so
7129 that it can modify the split-stack code to allocate a sufficiently
7130 large stack. We emit another special section if there are any
7131 functions in this file which have the no_split_stack attribute, to
7132 prevent the linker from warning about being unable to convert the
7133 functions if they call non-split-stack code. */
7136 file_end_indicate_split_stack (void)
7138 if (flag_split_stack)
7140 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG,
7142 if (saw_no_split_stack)
7143 switch_to_section (get_section (".note.GNU-no-split-stack",
7144 SECTION_DEBUG, NULL));
7148 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7149 a get_unnamed_section callback. */
7152 output_section_asm_op (const void *directive)
7154 fprintf (asm_out_file, "%s\n", (const char *) directive);
7157 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7158 the current section is NEW_SECTION. */
7161 switch_to_section (section *new_section)
7163 if (in_section == new_section)
7166 if (new_section->common.flags & SECTION_FORGET)
7169 in_section = new_section;
7171 switch (SECTION_STYLE (new_section))
7174 targetm.asm_out.named_section (new_section->named.name,
7175 new_section->named.common.flags,
7176 new_section->named.decl);
7179 case SECTION_UNNAMED:
7180 new_section->unnamed.callback (new_section->unnamed.data);
7183 case SECTION_NOSWITCH:
7188 new_section->common.flags |= SECTION_DECLARED;
7191 /* If block symbol SYMBOL has not yet been assigned an offset, place
7192 it at the end of its block. */
7195 place_block_symbol (rtx symbol)
7197 unsigned HOST_WIDE_INT size, mask, offset;
7198 struct constant_descriptor_rtx *desc;
7199 unsigned int alignment;
7200 struct object_block *block;
7203 gcc_assert (SYMBOL_REF_BLOCK (symbol));
7204 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
7207 /* Work out the symbol's size and alignment. */
7208 if (CONSTANT_POOL_ADDRESS_P (symbol))
7210 desc = SYMBOL_REF_CONSTANT (symbol);
7211 alignment = desc->align;
7212 size = GET_MODE_SIZE (desc->mode);
7214 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
7216 decl = SYMBOL_REF_DECL (symbol);
7217 alignment = DECL_ALIGN (decl);
7218 size = get_constant_size (DECL_INITIAL (decl));
7222 decl = SYMBOL_REF_DECL (symbol);
7223 alignment = DECL_ALIGN (decl);
7224 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
7227 /* Calculate the object's offset from the start of the block. */
7228 block = SYMBOL_REF_BLOCK (symbol);
7229 mask = alignment / BITS_PER_UNIT - 1;
7230 offset = (block->size + mask) & ~mask;
7231 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
7233 /* Record the block's new alignment and size. */
7234 block->alignment = MAX (block->alignment, alignment);
7235 block->size = offset + size;
7237 VEC_safe_push (rtx, gc, block->objects, symbol);
7240 /* Return the anchor that should be used to address byte offset OFFSET
7241 from the first object in BLOCK. MODEL is the TLS model used
7245 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
7246 enum tls_model model)
7249 unsigned int begin, middle, end;
7250 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
7253 /* Work out the anchor's offset. Use an offset of 0 for the first
7254 anchor so that we don't pessimize the case where we take the address
7255 of a variable at the beginning of the block. This is particularly
7256 useful when a block has only one variable assigned to it.
7258 We try to place anchors RANGE bytes apart, so there can then be
7259 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7260 a ptr_mode offset. With some target settings, the lowest such
7261 anchor might be out of range for the lowest ptr_mode offset;
7262 likewise the highest anchor for the highest offset. Use anchors
7263 at the extreme ends of the ptr_mode range in such cases.
7265 All arithmetic uses unsigned integers in order to avoid
7267 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
7268 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
7269 range = max_offset - min_offset + 1;
7274 bias = 1 << (GET_MODE_BITSIZE (ptr_mode) - 1);
7277 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
7278 delta -= delta % range;
7281 offset = (HOST_WIDE_INT) (-delta);
7285 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
7286 delta -= delta % range;
7287 if (delta > bias - 1)
7289 offset = (HOST_WIDE_INT) delta;
7293 /* Do a binary search to see if there's already an anchor we can use.
7294 Set BEGIN to the new anchor's index if not. */
7296 end = VEC_length (rtx, block->anchors);
7297 while (begin != end)
7299 middle = (end + begin) / 2;
7300 anchor = VEC_index (rtx, block->anchors, middle);
7301 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
7303 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
7305 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
7307 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
7313 /* Create a new anchor with a unique label. */
7314 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
7315 anchor = create_block_symbol (ggc_strdup (label), block, offset);
7316 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
7317 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
7319 /* Insert it at index BEGIN. */
7320 VEC_safe_insert (rtx, gc, block->anchors, begin, anchor);
7324 /* Output the objects in BLOCK. */
7327 output_object_block (struct object_block *block)
7329 struct constant_descriptor_rtx *desc;
7331 HOST_WIDE_INT offset;
7335 if (block->objects == NULL)
7338 /* Switch to the section and make sure that the first byte is
7339 suitably aligned. */
7340 switch_to_section (block->sect);
7341 assemble_align (block->alignment);
7343 /* Define the values of all anchors relative to the current section
7345 FOR_EACH_VEC_ELT (rtx, block->anchors, i, symbol)
7346 targetm.asm_out.output_anchor (symbol);
7348 /* Output the objects themselves. */
7350 FOR_EACH_VEC_ELT (rtx, block->objects, i, symbol)
7352 /* Move to the object's offset, padding with zeros if necessary. */
7353 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
7354 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
7355 if (CONSTANT_POOL_ADDRESS_P (symbol))
7357 desc = SYMBOL_REF_CONSTANT (symbol);
7358 output_constant_pool_1 (desc, 1);
7359 offset += GET_MODE_SIZE (desc->mode);
7361 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
7363 decl = SYMBOL_REF_DECL (symbol);
7364 assemble_constant_contents (DECL_INITIAL (decl), XSTR (symbol, 0),
7366 offset += get_constant_size (DECL_INITIAL (decl));
7370 decl = SYMBOL_REF_DECL (symbol);
7371 assemble_variable_contents (decl, XSTR (symbol, 0), false);
7372 offset += tree_low_cst (DECL_SIZE_UNIT (decl), 1);
7377 /* A htab_traverse callback used to call output_object_block for
7378 each member of object_block_htab. */
7381 output_object_block_htab (void **slot, void *data ATTRIBUTE_UNUSED)
7383 output_object_block ((struct object_block *) (*slot));
7387 /* Output the definitions of all object_blocks. */
7390 output_object_blocks (void)
7392 htab_traverse (object_block_htab, output_object_block_htab, NULL);
7395 /* This function provides a possible implementation of the
7396 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7397 by -frecord-gcc-switches it creates a new mergeable, string section in the
7398 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7399 contains the switches in ASCII format.
7401 FIXME: This code does not correctly handle double quote characters
7402 that appear inside strings, (it strips them rather than preserving them).
7403 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7404 characters - instead it treats them as sub-string separators. Since
7405 we want to emit NUL strings terminators into the object file we have to use
7409 elf_record_gcc_switches (print_switch_type type, const char * name)
7413 case SWITCH_TYPE_PASSED:
7414 ASM_OUTPUT_ASCII (asm_out_file, name, strlen (name));
7415 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
7418 case SWITCH_TYPE_DESCRIPTIVE:
7421 /* Distinguish between invocations where name is NULL. */
7422 static bool started = false;
7428 sec = get_section (targetm.asm_out.record_gcc_switches_section,
7432 | (SECTION_ENTSIZE & 1),
7434 switch_to_section (sec);
7443 /* The return value is currently ignored by the caller, but must be 0.
7444 For -fverbose-asm the return value would be the number of characters
7445 emitted into the assembler file. */
7449 /* Emit text to declare externally defined symbols. It is needed to
7450 properly support non-default visibility. */
7452 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED,
7454 const char *name ATTRIBUTE_UNUSED)
7456 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7457 set in order to avoid putting out names that are never really
7459 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
7460 && targetm.binds_local_p (decl))
7461 maybe_assemble_visibility (decl);
7464 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7467 default_asm_output_source_filename (FILE *file, const char *name)
7469 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7470 ASM_OUTPUT_SOURCE_FILENAME (file, name);
7472 fprintf (file, "\t.file\t");
7473 output_quoted_string (file, name);
7478 /* Output a file name in the form wanted by System V. */
7481 output_file_directive (FILE *asm_file, const char *input_name)
7486 if (input_name == NULL)
7487 input_name = "<stdin>";
7489 input_name = remap_debug_filename (input_name);
7491 len = strlen (input_name);
7492 na = input_name + len;
7494 /* NA gets INPUT_NAME sans directory names. */
7495 while (na > input_name)
7497 if (IS_DIR_SEPARATOR (na[-1]))
7502 targetm.asm_out.output_source_filename (asm_file, na);
7505 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7508 make_debug_expr_from_rtl (const_rtx exp)
7510 tree ddecl = make_node (DEBUG_EXPR_DECL), type;
7511 enum machine_mode mode = GET_MODE (exp);
7514 DECL_ARTIFICIAL (ddecl) = 1;
7515 if (REG_P (exp) && REG_EXPR (exp))
7516 type = TREE_TYPE (REG_EXPR (exp));
7517 else if (MEM_P (exp) && MEM_EXPR (exp))
7518 type = TREE_TYPE (MEM_EXPR (exp));
7521 if (type && TYPE_MODE (type) == mode)
7522 TREE_TYPE (ddecl) = type;
7524 TREE_TYPE (ddecl) = lang_hooks.types.type_for_mode (mode, 1);
7525 DECL_MODE (ddecl) = mode;
7526 dval = gen_rtx_DEBUG_EXPR (mode);
7527 DEBUG_EXPR_TREE_DECL (dval) = ddecl;
7528 SET_DECL_RTL (ddecl, dval);
7532 #ifdef ELF_ASCII_ESCAPES
7533 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7536 default_elf_asm_output_limited_string (FILE *f, const char *s)
7541 fputs (STRING_ASM_OP, f);
7546 escape = ELF_ASCII_ESCAPES[c];
7553 /* TODO: Print in hex with fast function, important for -flto. */
7554 fprintf (f, "\\%03o", c);
7567 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7570 default_elf_asm_output_ascii (FILE *f, const char *s, unsigned int len)
7572 const char *limit = s + len;
7573 const char *last_null = NULL;
7574 unsigned bytes_in_chunk = 0;
7578 for (; s < limit; s++)
7582 if (bytes_in_chunk >= 60)
7591 for (p = s; p < limit && *p != '\0'; p++)
7598 if (p < limit && (p - s) <= (long) ELF_STRING_LIMIT)
7600 if (bytes_in_chunk > 0)
7607 default_elf_asm_output_limited_string (f, s);
7612 if (bytes_in_chunk == 0)
7613 fputs (ASCII_DATA_ASM_OP "\"", f);
7616 escape = ELF_ASCII_ESCAPES[c];
7624 /* TODO: Print in hex with fast function, important for -flto. */
7625 fprintf (f, "\\%03o", c);
7626 bytes_in_chunk += 4;
7631 bytes_in_chunk += 2;
7638 if (bytes_in_chunk > 0)
7646 static GTY(()) section *elf_init_array_section;
7647 static GTY(()) section *elf_fini_array_section;
7650 get_elf_initfini_array_priority_section (int priority,
7654 if (priority != DEFAULT_INIT_PRIORITY)
7657 sprintf (buf, "%s.%.5u",
7658 constructor_p ? ".init_array" : ".fini_array",
7660 sec = get_section (buf, SECTION_WRITE, NULL_TREE);
7666 if (elf_init_array_section == NULL)
7667 elf_init_array_section
7668 = get_unnamed_section (0, output_section_asm_op,
7669 "\t.section\t.init_array");
7670 sec = elf_init_array_section;
7674 if (elf_fini_array_section == NULL)
7675 elf_fini_array_section
7676 = get_unnamed_section (0, output_section_asm_op,
7677 "\t.section\t.fini_array");
7678 sec = elf_fini_array_section;
7684 /* Use .init_array section for constructors. */
7687 default_elf_init_array_asm_out_constructor (rtx symbol, int priority)
7689 section *sec = get_elf_initfini_array_priority_section (priority,
7691 assemble_addr_to_section (symbol, sec);
7694 /* Use .fini_array section for destructors. */
7697 default_elf_fini_array_asm_out_destructor (rtx symbol, int priority)
7699 section *sec = get_elf_initfini_array_priority_section (priority,
7701 assemble_addr_to_section (symbol, sec);
7704 #include "gt-varasm.h"