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
4 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 2, 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 COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
24 /* This file handles generation of all the assembler code
25 *except* the instructions of a function.
26 This includes declarations of variables and their initial values.
28 We also output the assembler code for constants stored in memory
29 and are responsible for combining constants with the same value. */
33 #include "coretypes.h"
40 #include "hard-reg-set.h"
48 #include "langhooks.h"
52 #include "tree-mudflap.h"
54 #include "cfglayout.h"
55 #include "basic-block.h"
57 #ifdef XCOFF_DEBUGGING_INFO
58 #include "xcoffout.h" /* Needed for external data
59 declarations for e.g. AIX 4.x. */
62 /* The (assembler) name of the first globally-visible object output. */
63 extern GTY(()) const char *first_global_object_name;
64 extern GTY(()) const char *weak_global_object_name;
66 const char *first_global_object_name;
67 const char *weak_global_object_name;
70 struct constant_descriptor_rtx;
71 struct rtx_constant_pool;
73 struct varasm_status GTY(())
75 /* If we're using a per-function constant pool, this is it. */
76 struct rtx_constant_pool *pool;
78 /* Number of tree-constants deferred during the expansion of this
80 unsigned int deferred_constants;
83 #define n_deferred_constants (cfun->varasm->deferred_constants)
85 /* Number for making the label on the next
86 constant that is stored in memory. */
88 static GTY(()) int const_labelno;
90 /* Carry information from ASM_DECLARE_OBJECT_NAME
91 to ASM_FINISH_DECLARE_OBJECT. */
93 int size_directive_output;
95 /* The last decl for which assemble_variable was called,
96 if it did ASM_DECLARE_OBJECT_NAME.
97 If the last call to assemble_variable didn't do that,
100 tree last_assemble_variable_decl;
102 /* The following global variable indicates if the first basic block
103 in a function belongs to the cold partition or not. */
105 bool first_function_block_is_cold;
107 /* We give all constants their own alias set. Perhaps redundant with
108 MEM_READONLY_P, but pre-dates it. */
110 static HOST_WIDE_INT const_alias_set;
112 static const char *strip_reg_name (const char *);
113 static int contains_pointers_p (tree);
114 #ifdef ASM_OUTPUT_EXTERNAL
115 static bool incorporeal_function_p (tree);
117 static void decode_addr_const (tree, struct addr_const *);
118 static hashval_t const_desc_hash (const void *);
119 static int const_desc_eq (const void *, const void *);
120 static hashval_t const_hash_1 (const tree);
121 static int compare_constant (const tree, const tree);
122 static tree copy_constant (tree);
123 static void output_constant_def_contents (rtx);
124 static void output_addressed_constants (tree);
125 static unsigned HOST_WIDE_INT array_size_for_constructor (tree);
126 static unsigned min_align (unsigned, unsigned);
127 static void output_constructor (tree, unsigned HOST_WIDE_INT, unsigned int);
128 static void globalize_decl (tree);
129 static void maybe_assemble_visibility (tree);
130 #ifdef BSS_SECTION_ASM_OP
131 #ifdef ASM_OUTPUT_BSS
132 static void asm_output_bss (FILE *, tree, const char *,
133 unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT);
135 #ifdef ASM_OUTPUT_ALIGNED_BSS
136 static void asm_output_aligned_bss (FILE *, tree, const char *,
137 unsigned HOST_WIDE_INT, int)
140 #endif /* BSS_SECTION_ASM_OP */
141 static void mark_weak (tree);
142 static void output_constant_pool (const char *, tree);
144 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
145 section *text_section;
146 section *data_section;
147 section *readonly_data_section;
148 section *sdata_section;
149 section *ctors_section;
150 section *dtors_section;
151 section *bss_section;
152 section *sbss_section;
154 /* Various forms of common section. All are guaranteed to be nonnull. */
155 section *tls_comm_section;
156 section *comm_section;
157 section *lcomm_section;
159 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
161 section *bss_noswitch_section;
163 /* The section that holds the main exception table, when known. The section
164 is set either by the target's init_sections hook or by the first call to
165 switch_to_exception_section. */
166 section *exception_section;
168 /* The section that holds the DWARF2 frame unwind information, when known.
169 The section is set either by the target's init_sections hook or by the
170 first call to switch_to_eh_frame_section. */
171 section *eh_frame_section;
173 /* asm_out_file's current section. This is NULL if no section has yet
174 been selected or if we lose track of what the current section is. */
177 /* True if code for the current function is currently being directed
178 at the cold section. */
179 bool in_cold_section_p;
181 /* A linked list of all the unnamed sections. */
182 static GTY(()) section *unnamed_sections;
184 /* Return a nonzero value if DECL has a section attribute. */
185 #ifndef IN_NAMED_SECTION
186 #define IN_NAMED_SECTION(DECL) \
187 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
188 && DECL_SECTION_NAME (DECL) != NULL_TREE)
191 /* Hash table of named sections. */
192 static GTY((param_is (section))) htab_t section_htab;
194 /* A table of object_blocks, indexed by section. */
195 static GTY((param_is (struct object_block))) htab_t object_block_htab;
197 /* The next number to use for internal anchor labels. */
198 static GTY(()) int anchor_labelno;
200 /* A pool of constants that can be shared between functions. */
201 static GTY(()) struct rtx_constant_pool *shared_constant_pool;
203 /* Helper routines for maintaining section_htab. */
206 section_entry_eq (const void *p1, const void *p2)
208 const section *old = p1;
209 const char *new = p2;
211 return strcmp (old->named.name, new) == 0;
215 section_entry_hash (const void *p)
217 const section *old = p;
218 return htab_hash_string (old->named.name);
221 /* Return a hash value for section SECT. */
224 hash_section (section *sect)
226 if (sect->common.flags & SECTION_NAMED)
227 return htab_hash_string (sect->named.name);
228 return sect->common.flags;
231 /* Helper routines for maintaining object_block_htab. */
234 object_block_entry_eq (const void *p1, const void *p2)
236 const struct object_block *old = p1;
237 const section *new = p2;
239 return old->sect == new;
243 object_block_entry_hash (const void *p)
245 const struct object_block *old = p;
246 return hash_section (old->sect);
249 /* Return a new unnamed section with the given fields. */
252 get_unnamed_section (unsigned int flags, void (*callback) (const void *),
257 sect = ggc_alloc (sizeof (struct unnamed_section));
258 sect->unnamed.common.flags = flags | SECTION_UNNAMED;
259 sect->unnamed.callback = callback;
260 sect->unnamed.data = data;
261 sect->unnamed.next = unnamed_sections;
263 unnamed_sections = sect;
267 /* Return a SECTION_NOSWITCH section with the given fields. */
270 get_noswitch_section (unsigned int flags, noswitch_section_callback callback)
274 sect = ggc_alloc (sizeof (struct unnamed_section));
275 sect->noswitch.common.flags = flags | SECTION_NOSWITCH;
276 sect->noswitch.callback = callback;
281 /* Return the named section structure associated with NAME. Create
282 a new section with the given fields if no such structure exists. */
285 get_section (const char *name, unsigned int flags, tree decl)
287 section *sect, **slot;
290 htab_find_slot_with_hash (section_htab, name,
291 htab_hash_string (name), INSERT);
292 flags |= SECTION_NAMED;
295 sect = ggc_alloc (sizeof (struct named_section));
296 sect->named.common.flags = flags;
297 sect->named.name = ggc_strdup (name);
298 sect->named.decl = decl;
304 if ((sect->common.flags & ~SECTION_DECLARED) != flags
305 && ((sect->common.flags | flags) & SECTION_OVERRIDE) == 0)
307 /* Sanity check user variables for flag changes. */
309 decl = sect->named.decl;
311 error ("%+D causes a section type conflict", decl);
317 /* Return true if the current compilation mode benefits from having
318 objects grouped into blocks. */
321 use_object_blocks_p (void)
323 return flag_section_anchors;
326 /* Return the object_block structure for section SECT. Create a new
327 structure if we haven't created one already. Return null if SECT
330 static struct object_block *
331 get_block_for_section (section *sect)
333 struct object_block *block;
339 slot = htab_find_slot_with_hash (object_block_htab, sect,
340 hash_section (sect), INSERT);
341 block = (struct object_block *) *slot;
344 block = (struct object_block *)
345 ggc_alloc_cleared (sizeof (struct object_block));
352 /* Create a symbol with label LABEL and place it at byte offset
353 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
354 is not yet known. LABEL must be a garbage-collected string. */
357 create_block_symbol (const char *label, struct object_block *block,
358 HOST_WIDE_INT offset)
363 /* Create the extended SYMBOL_REF. */
364 size = RTX_HDR_SIZE + sizeof (struct block_symbol);
365 symbol = ggc_alloc_zone (size, &rtl_zone);
367 /* Initialize the normal SYMBOL_REF fields. */
368 memset (symbol, 0, size);
369 PUT_CODE (symbol, SYMBOL_REF);
370 PUT_MODE (symbol, Pmode);
371 XSTR (symbol, 0) = label;
372 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_HAS_BLOCK_INFO;
374 /* Initialize the block_symbol stuff. */
375 SYMBOL_REF_BLOCK (symbol) = block;
376 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
382 initialize_cold_section_name (void)
384 const char *stripped_name;
388 gcc_assert (cfun && current_function_decl);
389 if (cfun->unlikely_text_section_name)
392 dsn = DECL_SECTION_NAME (current_function_decl);
393 if (flag_function_sections && dsn)
395 name = alloca (TREE_STRING_LENGTH (dsn) + 1);
396 memcpy (name, TREE_STRING_POINTER (dsn), TREE_STRING_LENGTH (dsn) + 1);
398 stripped_name = targetm.strip_name_encoding (name);
400 buffer = ACONCAT ((stripped_name, "_unlikely", NULL));
401 cfun->unlikely_text_section_name = ggc_strdup (buffer);
404 cfun->unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
407 /* Tell assembler to switch to unlikely-to-be-executed text section. */
410 unlikely_text_section (void)
414 if (!cfun->unlikely_text_section_name)
415 initialize_cold_section_name ();
417 return get_named_section (NULL, cfun->unlikely_text_section_name, 0);
420 return get_named_section (NULL, UNLIKELY_EXECUTED_TEXT_SECTION_NAME, 0);
423 /* When called within a function context, return true if the function
424 has been assigned a cold text section and if SECT is that section.
425 When called outside a function context, return true if SECT is the
426 default cold section. */
429 unlikely_text_section_p (section *sect)
434 name = cfun->unlikely_text_section_name;
436 name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
440 && SECTION_STYLE (sect) == SECTION_NAMED
441 && strcmp (name, sect->named.name) == 0);
444 /* Return a section with a particular name and with whatever SECTION_*
445 flags section_type_flags deems appropriate. The name of the section
446 is taken from NAME if nonnull, otherwise it is taken from DECL's
447 DECL_SECTION_NAME. DECL is the decl associated with the section
448 (see the section comment for details) and RELOC is as for
449 section_type_flags. */
452 get_named_section (tree decl, const char *name, int reloc)
456 gcc_assert (!decl || DECL_P (decl));
458 name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
460 flags = targetm.section_type_flags (decl, name, reloc);
462 return get_section (name, flags, decl);
465 /* If required, set DECL_SECTION_NAME to a unique name. */
468 resolve_unique_section (tree decl, int reloc ATTRIBUTE_UNUSED,
469 int flag_function_or_data_sections)
471 if (DECL_SECTION_NAME (decl) == NULL_TREE
472 && targetm.have_named_sections
473 && (flag_function_or_data_sections
474 || DECL_ONE_ONLY (decl)))
475 targetm.asm_out.unique_section (decl, reloc);
478 #ifdef BSS_SECTION_ASM_OP
480 #ifdef ASM_OUTPUT_BSS
482 /* Utility function for ASM_OUTPUT_BSS for targets to use if
483 they don't support alignments in .bss.
484 ??? It is believed that this function will work in most cases so such
485 support is localized here. */
488 asm_output_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
490 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
491 unsigned HOST_WIDE_INT rounded)
493 targetm.asm_out.globalize_label (file, name);
494 switch_to_section (bss_section);
495 #ifdef ASM_DECLARE_OBJECT_NAME
496 last_assemble_variable_decl = decl;
497 ASM_DECLARE_OBJECT_NAME (file, name, decl);
499 /* Standard thing is just output label for the object. */
500 ASM_OUTPUT_LABEL (file, name);
501 #endif /* ASM_DECLARE_OBJECT_NAME */
502 ASM_OUTPUT_SKIP (file, rounded ? rounded : 1);
507 #ifdef ASM_OUTPUT_ALIGNED_BSS
509 /* Utility function for targets to use in implementing
510 ASM_OUTPUT_ALIGNED_BSS.
511 ??? It is believed that this function will work in most cases so such
512 support is localized here. */
515 asm_output_aligned_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
516 const char *name, unsigned HOST_WIDE_INT size,
519 switch_to_section (bss_section);
520 ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
521 #ifdef ASM_DECLARE_OBJECT_NAME
522 last_assemble_variable_decl = decl;
523 ASM_DECLARE_OBJECT_NAME (file, name, decl);
525 /* Standard thing is just output label for the object. */
526 ASM_OUTPUT_LABEL (file, name);
527 #endif /* ASM_DECLARE_OBJECT_NAME */
528 ASM_OUTPUT_SKIP (file, size ? size : 1);
533 #endif /* BSS_SECTION_ASM_OP */
535 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
536 /* Return the hot section for function DECL. Return text_section for
540 hot_function_section (tree decl)
542 if (decl != NULL_TREE
543 && DECL_SECTION_NAME (decl) != NULL_TREE
544 && targetm.have_named_sections)
545 return get_named_section (decl, NULL, 0);
551 /* Return the section for function DECL.
553 If DECL is NULL_TREE, return the text section. We can be passed
554 NULL_TREE under some circumstances by dbxout.c at least. */
557 function_section (tree decl)
561 if (first_function_block_is_cold)
564 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
565 if (decl != NULL_TREE
566 && DECL_SECTION_NAME (decl) != NULL_TREE)
567 return reloc ? unlikely_text_section ()
568 : get_named_section (decl, NULL, 0);
570 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
572 return reloc ? unlikely_text_section () : hot_function_section (decl);
577 current_function_section (void)
579 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
580 if (current_function_decl != NULL_TREE
581 && DECL_SECTION_NAME (current_function_decl) != NULL_TREE)
582 return in_cold_section_p ? unlikely_text_section ()
583 : get_named_section (current_function_decl,
586 return targetm.asm_out.select_section (current_function_decl,
588 DECL_ALIGN (current_function_decl));
590 return (in_cold_section_p
591 ? unlikely_text_section ()
592 : hot_function_section (current_function_decl));
596 /* Return the read-only data section associated with function DECL. */
599 default_function_rodata_section (tree decl)
601 if (decl != NULL_TREE && DECL_SECTION_NAME (decl))
603 const char *name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
605 if (DECL_ONE_ONLY (decl) && HAVE_COMDAT_GROUP)
607 size_t len = strlen (name) + 3;
608 char* rname = alloca (len);
610 strcpy (rname, ".rodata");
611 strcat (rname, name + 5);
612 return get_section (rname, SECTION_LINKONCE, decl);
614 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
615 else if (DECL_ONE_ONLY (decl)
616 && strncmp (name, ".gnu.linkonce.t.", 16) == 0)
618 size_t len = strlen (name) + 1;
619 char *rname = alloca (len);
621 memcpy (rname, name, len);
623 return get_section (rname, SECTION_LINKONCE, decl);
625 /* For .text.foo we want to use .rodata.foo. */
626 else if (flag_function_sections && flag_data_sections
627 && strncmp (name, ".text.", 6) == 0)
629 size_t len = strlen (name) + 1;
630 char *rname = alloca (len + 2);
632 memcpy (rname, ".rodata", 7);
633 memcpy (rname + 7, name + 5, len - 5);
634 return get_section (rname, 0, decl);
638 return readonly_data_section;
641 /* Return the read-only data section associated with function DECL
642 for targets where that section should be always the single
643 readonly data section. */
646 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED)
648 return readonly_data_section;
651 /* Return the section to use for string merging. */
654 mergeable_string_section (tree decl ATTRIBUTE_UNUSED,
655 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
656 unsigned int flags ATTRIBUTE_UNUSED)
658 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
659 && TREE_CODE (decl) == STRING_CST
660 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
662 && TREE_STRING_LENGTH (decl) >= int_size_in_bytes (TREE_TYPE (decl)))
664 enum machine_mode mode;
665 unsigned int modesize;
670 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (decl)));
671 modesize = GET_MODE_BITSIZE (mode);
672 if (modesize >= 8 && modesize <= 256
673 && (modesize & (modesize - 1)) == 0)
675 if (align < modesize)
678 str = TREE_STRING_POINTER (decl);
679 len = TREE_STRING_LENGTH (decl);
680 unit = GET_MODE_SIZE (mode);
682 /* Check for embedded NUL characters. */
683 for (i = 0; i < len; i += unit)
685 for (j = 0; j < unit; j++)
686 if (str[i + j] != '\0')
693 sprintf (name, ".rodata.str%d.%d", modesize / 8,
695 flags |= (modesize / 8) | SECTION_MERGE | SECTION_STRINGS;
696 return get_section (name, flags, NULL);
701 return readonly_data_section;
704 /* Return the section to use for constant merging. */
707 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED,
708 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
709 unsigned int flags ATTRIBUTE_UNUSED)
711 unsigned int modesize = GET_MODE_BITSIZE (mode);
713 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
719 && (align & (align - 1)) == 0)
723 sprintf (name, ".rodata.cst%d", (int) (align / 8));
724 flags |= (align / 8) | SECTION_MERGE;
725 return get_section (name, flags, NULL);
727 return readonly_data_section;
730 /* Given NAME, a putative register name, discard any customary prefixes. */
733 strip_reg_name (const char *name)
735 #ifdef REGISTER_PREFIX
736 if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
737 name += strlen (REGISTER_PREFIX);
739 if (name[0] == '%' || name[0] == '#')
744 /* The user has asked for a DECL to have a particular name. Set (or
745 change) it in such a way that we don't prefix an underscore to
748 set_user_assembler_name (tree decl, const char *name)
750 char *starred = alloca (strlen (name) + 2);
752 strcpy (starred + 1, name);
753 change_decl_assembler_name (decl, get_identifier (starred));
754 SET_DECL_RTL (decl, NULL_RTX);
757 /* Decode an `asm' spec for a declaration as a register name.
758 Return the register number, or -1 if nothing specified,
759 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
760 or -3 if ASMSPEC is `cc' and is not recognized,
761 or -4 if ASMSPEC is `memory' and is not recognized.
762 Accept an exact spelling or a decimal number.
763 Prefixes such as % are optional. */
766 decode_reg_name (const char *asmspec)
772 /* Get rid of confusing prefixes. */
773 asmspec = strip_reg_name (asmspec);
775 /* Allow a decimal number as a "register name". */
776 for (i = strlen (asmspec) - 1; i >= 0; i--)
777 if (! ISDIGIT (asmspec[i]))
779 if (asmspec[0] != 0 && i < 0)
782 if (i < FIRST_PSEUDO_REGISTER && i >= 0)
788 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
790 && ! strcmp (asmspec, strip_reg_name (reg_names[i])))
793 #ifdef ADDITIONAL_REGISTER_NAMES
795 static const struct { const char *const name; const int number; } table[]
796 = ADDITIONAL_REGISTER_NAMES;
798 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
800 && ! strcmp (asmspec, table[i].name))
801 return table[i].number;
803 #endif /* ADDITIONAL_REGISTER_NAMES */
805 if (!strcmp (asmspec, "memory"))
808 if (!strcmp (asmspec, "cc"))
817 /* Return true if DECL's initializer is suitable for a BSS section. */
820 bss_initializer_p (tree decl)
822 return (DECL_INITIAL (decl) == NULL
823 || DECL_INITIAL (decl) == error_mark_node
824 || (flag_zero_initialized_in_bss
825 /* Leave constant zeroes in .rodata so they
827 && !TREE_READONLY (decl)
828 && initializer_zerop (DECL_INITIAL (decl))));
831 /* Return the section into which the given VAR_DECL or CONST_DECL
832 should be placed. PREFER_NOSWITCH_P is true if a noswitch
833 section should be used wherever possible. */
836 get_variable_section (tree decl, bool prefer_noswitch_p)
840 /* If the decl has been given an explicit section name, then it
841 isn't common, and shouldn't be handled as such. */
842 if (DECL_COMMON (decl) && DECL_SECTION_NAME (decl) == NULL)
844 if (DECL_THREAD_LOCAL_P (decl))
845 return tls_comm_section;
846 if (TREE_PUBLIC (decl) && bss_initializer_p (decl))
850 if (DECL_INITIAL (decl) == error_mark_node)
851 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
852 else if (DECL_INITIAL (decl))
853 reloc = compute_reloc_for_constant (DECL_INITIAL (decl));
857 resolve_unique_section (decl, reloc, flag_data_sections);
858 if (IN_NAMED_SECTION (decl))
859 return get_named_section (decl, NULL, reloc);
861 if (!DECL_THREAD_LOCAL_P (decl)
862 && !(prefer_noswitch_p && targetm.have_switchable_bss_sections)
863 && bss_initializer_p (decl))
865 if (!TREE_PUBLIC (decl))
866 return lcomm_section;
867 if (bss_noswitch_section)
868 return bss_noswitch_section;
871 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
874 /* Return the block into which object_block DECL should be placed. */
876 static struct object_block *
877 get_block_for_decl (tree decl)
881 if (TREE_CODE (decl) == VAR_DECL)
883 /* The object must be defined in this translation unit. */
884 if (DECL_EXTERNAL (decl))
887 /* There's no point using object blocks for something that is
888 isolated by definition. */
889 if (DECL_ONE_ONLY (decl))
893 /* We can only calculate block offsets if the decl has a known
895 if (DECL_SIZE_UNIT (decl) == NULL)
897 if (!host_integerp (DECL_SIZE_UNIT (decl), 1))
900 /* Find out which section should contain DECL. We cannot put it into
901 an object block if it requires a standalone definition. */
902 sect = get_variable_section (decl, true);
903 if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
906 return get_block_for_section (sect);
909 /* Make sure block symbol SYMBOL is in block BLOCK. */
912 change_symbol_block (rtx symbol, struct object_block *block)
914 if (block != SYMBOL_REF_BLOCK (symbol))
916 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol) < 0);
917 SYMBOL_REF_BLOCK (symbol) = block;
921 /* Return true if it is possible to put DECL in an object_block. */
924 use_blocks_for_decl_p (tree decl)
926 /* Only data DECLs can be placed into object blocks. */
927 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != CONST_DECL)
930 /* Detect decls created by dw2_force_const_mem. Such decls are
931 special because DECL_INITIAL doesn't specify the decl's true value.
932 dw2_output_indirect_constants will instead call assemble_variable
933 with dont_output_data set to 1 and then print the contents itself. */
934 if (DECL_INITIAL (decl) == decl)
940 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
941 have static storage duration. In other words, it should not be an
942 automatic variable, including PARM_DECLs.
944 There is, however, one exception: this function handles variables
945 explicitly placed in a particular register by the user.
947 This is never called for PARM_DECL nodes. */
950 make_decl_rtl (tree decl)
952 const char *name = 0;
956 /* Check that we are not being given an automatic variable. */
957 gcc_assert (TREE_CODE (decl) != PARM_DECL
958 && TREE_CODE (decl) != RESULT_DECL);
960 /* A weak alias has TREE_PUBLIC set but not the other bits. */
961 gcc_assert (TREE_CODE (decl) != VAR_DECL
962 || TREE_STATIC (decl)
963 || TREE_PUBLIC (decl)
964 || DECL_EXTERNAL (decl)
965 || DECL_REGISTER (decl));
967 /* And that we were not given a type or a label. */
968 gcc_assert (TREE_CODE (decl) != TYPE_DECL
969 && TREE_CODE (decl) != LABEL_DECL);
971 /* For a duplicate declaration, we can be called twice on the
972 same DECL node. Don't discard the RTL already made. */
973 if (DECL_RTL_SET_P (decl))
975 /* If the old RTL had the wrong mode, fix the mode. */
977 if (GET_MODE (x) != DECL_MODE (decl))
978 SET_DECL_RTL (decl, adjust_address_nv (x, DECL_MODE (decl), 0));
980 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
983 /* ??? Another way to do this would be to maintain a hashed
984 table of such critters. Instead of adding stuff to a DECL
985 to give certain attributes to it, we could use an external
986 hash map from DECL to set of attributes. */
988 /* Let the target reassign the RTL if it wants.
989 This is necessary, for example, when one machine specific
990 decl attribute overrides another. */
991 targetm.encode_section_info (decl, DECL_RTL (decl), false);
993 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
994 on the new decl information. */
996 && GET_CODE (XEXP (x, 0)) == SYMBOL_REF
997 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x, 0)))
998 change_symbol_block (XEXP (x, 0), get_block_for_decl (decl));
1000 /* Make this function static known to the mudflap runtime. */
1001 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1002 mudflap_enqueue_decl (decl);
1007 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1009 if (name[0] != '*' && TREE_CODE (decl) != FUNCTION_DECL
1010 && DECL_REGISTER (decl))
1012 error ("register name not specified for %q+D", decl);
1014 else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1016 const char *asmspec = name+1;
1017 reg_number = decode_reg_name (asmspec);
1018 /* First detect errors in declaring global registers. */
1019 if (reg_number == -1)
1020 error ("register name not specified for %q+D", decl);
1021 else if (reg_number < 0)
1022 error ("invalid register name for %q+D", decl);
1023 else if (TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
1024 error ("data type of %q+D isn%'t suitable for a register",
1026 else if (! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl))))
1027 error ("register specified for %q+D isn%'t suitable for data type",
1029 /* Now handle properly declared static register variables. */
1034 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
1036 DECL_INITIAL (decl) = 0;
1037 error ("global register variable has initial value");
1039 if (TREE_THIS_VOLATILE (decl))
1040 warning (OPT_Wvolatile_register_var,
1041 "optimization may eliminate reads and/or "
1042 "writes to register variables");
1044 /* If the user specified one of the eliminables registers here,
1045 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1046 confused with that register and be eliminated. This usage is
1047 somewhat suspect... */
1049 SET_DECL_RTL (decl, gen_rtx_raw_REG (DECL_MODE (decl), reg_number));
1050 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
1051 REG_USERVAR_P (DECL_RTL (decl)) = 1;
1053 if (TREE_STATIC (decl))
1055 /* Make this register global, so not usable for anything
1057 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1058 name = IDENTIFIER_POINTER (DECL_NAME (decl));
1059 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
1061 nregs = hard_regno_nregs[reg_number][DECL_MODE (decl)];
1063 globalize_reg (reg_number + --nregs);
1066 /* As a register variable, it has no section. */
1070 /* Now handle ordinary static variables and functions (in memory).
1071 Also handle vars declared register invalidly. */
1072 else if (name[0] == '*')
1074 #ifdef REGISTER_PREFIX
1075 if (strlen (REGISTER_PREFIX) != 0)
1077 reg_number = decode_reg_name (name);
1078 if (reg_number >= 0 || reg_number == -3)
1079 error ("register name given for non-register variable %q+D", decl);
1084 /* Specifying a section attribute on a variable forces it into a
1085 non-.bss section, and thus it cannot be common. */
1086 if (TREE_CODE (decl) == VAR_DECL
1087 && DECL_SECTION_NAME (decl) != NULL_TREE
1088 && DECL_INITIAL (decl) == NULL_TREE
1089 && DECL_COMMON (decl))
1090 DECL_COMMON (decl) = 0;
1092 /* Variables can't be both common and weak. */
1093 if (TREE_CODE (decl) == VAR_DECL && DECL_WEAK (decl))
1094 DECL_COMMON (decl) = 0;
1096 if (use_object_blocks_p () && use_blocks_for_decl_p (decl))
1097 x = create_block_symbol (name, get_block_for_decl (decl), -1);
1099 x = gen_rtx_SYMBOL_REF (Pmode, name);
1100 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
1101 SET_SYMBOL_REF_DECL (x, decl);
1103 x = gen_rtx_MEM (DECL_MODE (decl), x);
1104 if (TREE_CODE (decl) != FUNCTION_DECL)
1105 set_mem_attributes (x, decl, 1);
1106 SET_DECL_RTL (decl, x);
1108 /* Optionally set flags or add text to the name to record information
1109 such as that it is a function name.
1110 If the name is changed, the macro ASM_OUTPUT_LABELREF
1111 will have to know how to strip this information. */
1112 targetm.encode_section_info (decl, DECL_RTL (decl), true);
1114 /* Make this function static known to the mudflap runtime. */
1115 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1116 mudflap_enqueue_decl (decl);
1119 /* Make the rtl for variable VAR be volatile.
1120 Use this only for static variables. */
1123 make_var_volatile (tree var)
1125 gcc_assert (MEM_P (DECL_RTL (var)));
1127 MEM_VOLATILE_P (DECL_RTL (var)) = 1;
1130 /* Output a string of literal assembler code
1131 for an `asm' keyword used between functions. */
1134 assemble_asm (tree string)
1138 if (TREE_CODE (string) == ADDR_EXPR)
1139 string = TREE_OPERAND (string, 0);
1141 fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string));
1144 /* Record an element in the table of global destructors. SYMBOL is
1145 a SYMBOL_REF of the function to be called; PRIORITY is a number
1146 between 0 and MAX_INIT_PRIORITY. */
1149 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED,
1150 int priority ATTRIBUTE_UNUSED)
1152 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1153 /* Tell GNU LD that this is part of the static destructor set.
1154 This will work for any system that uses stabs, most usefully
1156 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1157 dbxout_stab_value_label (XSTR (symbol, 0));
1159 sorry ("global destructors not supported on this target");
1164 default_named_section_asm_out_destructor (rtx symbol, int priority)
1166 const char *section = ".dtors";
1169 /* ??? This only works reliably with the GNU linker. */
1170 if (priority != DEFAULT_INIT_PRIORITY)
1172 sprintf (buf, ".dtors.%.5u",
1173 /* Invert the numbering so the linker puts us in the proper
1174 order; constructors are run from right to left, and the
1175 linker sorts in increasing order. */
1176 MAX_INIT_PRIORITY - priority);
1180 switch_to_section (get_section (section, SECTION_WRITE, NULL));
1181 assemble_align (POINTER_SIZE);
1182 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1185 #ifdef DTORS_SECTION_ASM_OP
1187 default_dtor_section_asm_out_destructor (rtx symbol,
1188 int priority ATTRIBUTE_UNUSED)
1190 switch_to_section (dtors_section);
1191 assemble_align (POINTER_SIZE);
1192 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1196 /* Likewise for global constructors. */
1199 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED,
1200 int priority ATTRIBUTE_UNUSED)
1202 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1203 /* Tell GNU LD that this is part of the static destructor set.
1204 This will work for any system that uses stabs, most usefully
1206 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1207 dbxout_stab_value_label (XSTR (symbol, 0));
1209 sorry ("global constructors not supported on this target");
1214 default_named_section_asm_out_constructor (rtx symbol, int priority)
1216 const char *section = ".ctors";
1219 /* ??? This only works reliably with the GNU linker. */
1220 if (priority != DEFAULT_INIT_PRIORITY)
1222 sprintf (buf, ".ctors.%.5u",
1223 /* Invert the numbering so the linker puts us in the proper
1224 order; constructors are run from right to left, and the
1225 linker sorts in increasing order. */
1226 MAX_INIT_PRIORITY - priority);
1230 switch_to_section (get_section (section, SECTION_WRITE, NULL));
1231 assemble_align (POINTER_SIZE);
1232 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1235 #ifdef CTORS_SECTION_ASM_OP
1237 default_ctor_section_asm_out_constructor (rtx symbol,
1238 int priority ATTRIBUTE_UNUSED)
1240 switch_to_section (ctors_section);
1241 assemble_align (POINTER_SIZE);
1242 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1246 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1247 a nonzero value if the constant pool should be output before the
1248 start of the function, or a zero value if the pool should output
1249 after the end of the function. The default is to put it before the
1252 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1253 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1256 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1257 to be output to assembler.
1258 Set first_global_object_name and weak_global_object_name as appropriate. */
1261 notice_global_symbol (tree decl)
1263 const char **type = &first_global_object_name;
1265 if (first_global_object_name
1266 || !TREE_PUBLIC (decl)
1267 || DECL_EXTERNAL (decl)
1268 || !DECL_NAME (decl)
1269 || (TREE_CODE (decl) != FUNCTION_DECL
1270 && (TREE_CODE (decl) != VAR_DECL
1271 || (DECL_COMMON (decl)
1272 && (DECL_INITIAL (decl) == 0
1273 || DECL_INITIAL (decl) == error_mark_node))))
1274 || !MEM_P (DECL_RTL (decl)))
1277 /* We win when global object is found, but it is useful to know about weak
1278 symbol as well so we can produce nicer unique names. */
1279 if (DECL_WEAK (decl) || DECL_ONE_ONLY (decl))
1280 type = &weak_global_object_name;
1286 rtx decl_rtl = DECL_RTL (decl);
1288 p = targetm.strip_name_encoding (XSTR (XEXP (decl_rtl, 0), 0));
1289 name = ggc_strdup (p);
1295 /* Output assembler code for the constant pool of a function and associated
1296 with defining the name of the function. DECL describes the function.
1297 NAME is the function's name. For the constant pool, we use the current
1298 constant pool data. */
1301 assemble_start_function (tree decl, const char *fnname)
1304 char tmp_label[100];
1305 bool hot_label_written = false;
1307 cfun->unlikely_text_section_name = NULL;
1309 first_function_block_is_cold = false;
1310 if (flag_reorder_blocks_and_partition)
1312 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
1313 cfun->hot_section_label = ggc_strdup (tmp_label);
1314 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDB", const_labelno);
1315 cfun->cold_section_label = ggc_strdup (tmp_label);
1316 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTE", const_labelno);
1317 cfun->hot_section_end_label = ggc_strdup (tmp_label);
1318 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDE", const_labelno);
1319 cfun->cold_section_end_label = ggc_strdup (tmp_label);
1324 cfun->hot_section_label = NULL;
1325 cfun->cold_section_label = NULL;
1326 cfun->hot_section_end_label = NULL;
1327 cfun->cold_section_end_label = NULL;
1330 /* The following code does not need preprocessing in the assembler. */
1334 if (CONSTANT_POOL_BEFORE_FUNCTION)
1335 output_constant_pool (fnname, decl);
1337 resolve_unique_section (decl, 0, flag_function_sections);
1339 /* Make sure the not and cold text (code) sections are properly
1340 aligned. This is necessary here in the case where the function
1341 has both hot and cold sections, because we don't want to re-set
1342 the alignment when the section switch happens mid-function. */
1344 if (flag_reorder_blocks_and_partition)
1346 switch_to_section (unlikely_text_section ());
1347 assemble_align (FUNCTION_BOUNDARY);
1348 ASM_OUTPUT_LABEL (asm_out_file, cfun->cold_section_label);
1350 /* When the function starts with a cold section, we need to explicitly
1351 align the hot section and write out the hot section label.
1352 But if the current function is a thunk, we do not have a CFG. */
1353 if (!current_function_is_thunk
1354 && BB_PARTITION (ENTRY_BLOCK_PTR->next_bb) == BB_COLD_PARTITION)
1356 switch_to_section (text_section);
1357 assemble_align (FUNCTION_BOUNDARY);
1358 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_label);
1359 hot_label_written = true;
1360 first_function_block_is_cold = true;
1363 else if (DECL_SECTION_NAME (decl))
1365 /* Calls to function_section rely on first_function_block_is_cold
1366 being accurate. The first block may be cold even if we aren't
1367 doing partitioning, if the entire function was decided by
1368 choose_function_section (predict.c) to be cold. */
1370 initialize_cold_section_name ();
1372 if (cfun->unlikely_text_section_name
1373 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
1374 cfun->unlikely_text_section_name) == 0)
1375 first_function_block_is_cold = true;
1378 in_cold_section_p = first_function_block_is_cold;
1380 /* Switch to the correct text section for the start of the function. */
1382 switch_to_section (function_section (decl));
1383 if (flag_reorder_blocks_and_partition
1384 && !hot_label_written)
1385 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_label);
1387 /* Tell assembler to move to target machine's alignment for functions. */
1388 align = floor_log2 (FUNCTION_BOUNDARY / BITS_PER_UNIT);
1389 if (align < force_align_functions_log)
1390 align = force_align_functions_log;
1393 ASM_OUTPUT_ALIGN (asm_out_file, align);
1396 /* Handle a user-specified function alignment.
1397 Note that we still need to align to FUNCTION_BOUNDARY, as above,
1398 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1399 if (align_functions_log > align
1400 && cfun->function_frequency != FUNCTION_FREQUENCY_UNLIKELY_EXECUTED)
1402 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1403 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
1404 align_functions_log, align_functions - 1);
1406 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1410 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1411 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1414 (*debug_hooks->begin_function) (decl);
1416 /* Make function name accessible from other files, if appropriate. */
1418 if (TREE_PUBLIC (decl))
1420 notice_global_symbol (decl);
1422 globalize_decl (decl);
1424 maybe_assemble_visibility (decl);
1427 if (DECL_PRESERVE_P (decl))
1428 targetm.asm_out.mark_decl_preserved (fnname);
1430 /* Do any machine/system dependent processing of the function name. */
1431 #ifdef ASM_DECLARE_FUNCTION_NAME
1432 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1434 /* Standard thing is just output label for the function. */
1435 ASM_OUTPUT_LABEL (asm_out_file, fnname);
1436 #endif /* ASM_DECLARE_FUNCTION_NAME */
1439 /* Output assembler code associated with defining the size of the
1440 function. DECL describes the function. NAME is the function's name. */
1443 assemble_end_function (tree decl, const char *fnname ATTRIBUTE_UNUSED)
1445 #ifdef ASM_DECLARE_FUNCTION_SIZE
1446 /* We could have switched section in the middle of the function. */
1447 if (flag_reorder_blocks_and_partition)
1448 switch_to_section (function_section (decl));
1449 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1451 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1453 output_constant_pool (fnname, decl);
1454 switch_to_section (function_section (decl)); /* need to switch back */
1456 /* Output labels for end of hot/cold text sections (to be used by
1458 if (flag_reorder_blocks_and_partition)
1460 section *save_text_section;
1462 save_text_section = in_section;
1463 switch_to_section (unlikely_text_section ());
1464 ASM_OUTPUT_LABEL (asm_out_file, cfun->cold_section_end_label);
1465 if (first_function_block_is_cold)
1466 switch_to_section (text_section);
1468 switch_to_section (function_section (decl));
1469 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_end_label);
1470 switch_to_section (save_text_section);
1474 /* Assemble code to leave SIZE bytes of zeros. */
1477 assemble_zeros (unsigned HOST_WIDE_INT size)
1479 /* Do no output if -fsyntax-only. */
1480 if (flag_syntax_only)
1483 #ifdef ASM_NO_SKIP_IN_TEXT
1484 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1485 so we must output 0s explicitly in the text section. */
1486 if (ASM_NO_SKIP_IN_TEXT && (in_section->common.flags & SECTION_CODE) != 0)
1488 unsigned HOST_WIDE_INT i;
1489 for (i = 0; i < size; i++)
1490 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1495 ASM_OUTPUT_SKIP (asm_out_file, size);
1498 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1501 assemble_align (int align)
1503 if (align > BITS_PER_UNIT)
1505 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1509 /* Assemble a string constant with the specified C string as contents. */
1512 assemble_string (const char *p, int size)
1517 /* If the string is very long, split it up. */
1521 int thissize = size - pos;
1522 if (thissize > maximum)
1525 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1533 /* A noswitch_section_callback for lcomm_section. */
1536 emit_local (tree decl ATTRIBUTE_UNUSED,
1537 const char *name ATTRIBUTE_UNUSED,
1538 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1539 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1541 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1542 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name,
1543 size, DECL_ALIGN (decl));
1545 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1546 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, DECL_ALIGN (decl));
1549 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1554 /* A noswitch_section_callback for bss_noswitch_section. */
1556 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
1558 emit_bss (tree decl ATTRIBUTE_UNUSED,
1559 const char *name ATTRIBUTE_UNUSED,
1560 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1561 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1563 #if defined ASM_OUTPUT_ALIGNED_BSS
1564 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size, DECL_ALIGN (decl));
1567 ASM_OUTPUT_BSS (asm_out_file, decl, name, size, rounded);
1573 /* A noswitch_section_callback for comm_section. */
1576 emit_common (tree decl ATTRIBUTE_UNUSED,
1577 const char *name ATTRIBUTE_UNUSED,
1578 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1579 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1581 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1582 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name,
1583 size, DECL_ALIGN (decl));
1585 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1586 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, DECL_ALIGN (decl));
1589 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded);
1594 /* A noswitch_section_callback for tls_comm_section. */
1597 emit_tls_common (tree decl ATTRIBUTE_UNUSED,
1598 const char *name ATTRIBUTE_UNUSED,
1599 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1600 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1602 #ifdef ASM_OUTPUT_TLS_COMMON
1603 ASM_OUTPUT_TLS_COMMON (asm_out_file, decl, name, size);
1606 sorry ("thread-local COMMON data not implemented");
1611 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1612 NAME is the name of DECL's SYMBOL_REF. */
1615 assemble_noswitch_variable (tree decl, const char *name, section *sect)
1617 unsigned HOST_WIDE_INT size, rounded;
1619 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
1622 /* Don't allocate zero bytes of common,
1623 since that means "undefined external" in the linker. */
1627 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1628 so that each uninitialized object starts on such a boundary. */
1629 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
1630 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1631 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1633 if (!sect->noswitch.callback (decl, name, size, rounded)
1634 && (unsigned HOST_WIDE_INT) DECL_ALIGN_UNIT (decl) > rounded)
1635 warning (0, "requested alignment for %q+D is greater than "
1636 "implemented alignment of %wu", decl, rounded);
1639 /* A subroutine of assemble_variable. Output the label and contents of
1640 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1641 is as for assemble_variable. */
1644 assemble_variable_contents (tree decl, const char *name,
1645 bool dont_output_data)
1647 /* Do any machine/system dependent processing of the object. */
1648 #ifdef ASM_DECLARE_OBJECT_NAME
1649 last_assemble_variable_decl = decl;
1650 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
1652 /* Standard thing is just output label for the object. */
1653 ASM_OUTPUT_LABEL (asm_out_file, name);
1654 #endif /* ASM_DECLARE_OBJECT_NAME */
1656 if (!dont_output_data)
1658 if (DECL_INITIAL (decl)
1659 && DECL_INITIAL (decl) != error_mark_node
1660 && !initializer_zerop (DECL_INITIAL (decl)))
1661 /* Output the actual data. */
1662 output_constant (DECL_INITIAL (decl),
1663 tree_low_cst (DECL_SIZE_UNIT (decl), 1),
1666 /* Leave space for it. */
1667 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl), 1));
1671 /* Assemble everything that is needed for a variable or function declaration.
1672 Not used for automatic variables, and not used for function definitions.
1673 Should not be called for variables of incomplete structure type.
1675 TOP_LEVEL is nonzero if this variable has file scope.
1676 AT_END is nonzero if this is the special handling, at end of compilation,
1677 to define things that have had only tentative definitions.
1678 DONT_OUTPUT_DATA if nonzero means don't actually output the
1679 initial value (that will be done by the caller). */
1682 assemble_variable (tree decl, int top_level ATTRIBUTE_UNUSED,
1683 int at_end ATTRIBUTE_UNUSED, int dont_output_data)
1687 rtx decl_rtl, symbol;
1690 if (lang_hooks.decls.prepare_assemble_variable)
1691 lang_hooks.decls.prepare_assemble_variable (decl);
1693 last_assemble_variable_decl = 0;
1695 /* Normally no need to say anything here for external references,
1696 since assemble_external is called by the language-specific code
1697 when a declaration is first seen. */
1699 if (DECL_EXTERNAL (decl))
1702 /* Output no assembler code for a function declaration.
1703 Only definitions of functions output anything. */
1705 if (TREE_CODE (decl) == FUNCTION_DECL)
1708 /* Do nothing for global register variables. */
1709 if (DECL_RTL_SET_P (decl) && REG_P (DECL_RTL (decl)))
1711 TREE_ASM_WRITTEN (decl) = 1;
1715 /* If type was incomplete when the variable was declared,
1716 see if it is complete now. */
1718 if (DECL_SIZE (decl) == 0)
1719 layout_decl (decl, 0);
1721 /* Still incomplete => don't allocate it; treat the tentative defn
1722 (which is what it must have been) as an `extern' reference. */
1724 if (!dont_output_data && DECL_SIZE (decl) == 0)
1726 error ("storage size of %q+D isn%'t known", decl);
1727 TREE_ASM_WRITTEN (decl) = 1;
1731 /* The first declaration of a variable that comes through this function
1732 decides whether it is global (in C, has external linkage)
1733 or local (in C, has internal linkage). So do nothing more
1734 if this function has already run. */
1736 if (TREE_ASM_WRITTEN (decl))
1739 /* Make sure targetm.encode_section_info is invoked before we set
1741 decl_rtl = DECL_RTL (decl);
1743 TREE_ASM_WRITTEN (decl) = 1;
1745 /* Do no output if -fsyntax-only. */
1746 if (flag_syntax_only)
1751 if (! dont_output_data
1752 && ! host_integerp (DECL_SIZE_UNIT (decl), 1))
1754 error ("size of variable %q+D is too large", decl);
1758 gcc_assert (MEM_P (decl_rtl));
1759 gcc_assert (GET_CODE (XEXP (decl_rtl, 0)) == SYMBOL_REF);
1760 symbol = XEXP (decl_rtl, 0);
1761 name = XSTR (symbol, 0);
1762 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
1763 notice_global_symbol (decl);
1765 /* Compute the alignment of this data. */
1767 align = DECL_ALIGN (decl);
1769 /* In the case for initialing an array whose length isn't specified,
1770 where we have not yet been able to do the layout,
1771 figure out the proper alignment now. */
1772 if (dont_output_data && DECL_SIZE (decl) == 0
1773 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
1774 align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
1776 /* Some object file formats have a maximum alignment which they support.
1777 In particular, a.out format supports a maximum alignment of 4. */
1778 if (align > MAX_OFILE_ALIGNMENT)
1780 warning (0, "alignment of %q+D is greater than maximum object "
1781 "file alignment. Using %d", decl,
1782 MAX_OFILE_ALIGNMENT/BITS_PER_UNIT);
1783 align = MAX_OFILE_ALIGNMENT;
1786 /* On some machines, it is good to increase alignment sometimes. */
1787 if (! DECL_USER_ALIGN (decl))
1789 #ifdef DATA_ALIGNMENT
1790 align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
1792 #ifdef CONSTANT_ALIGNMENT
1793 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
1794 align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl), align);
1798 /* Reset the alignment in case we have made it tighter, so we can benefit
1799 from it in get_pointer_alignment. */
1800 DECL_ALIGN (decl) = align;
1801 set_mem_align (decl_rtl, align);
1803 if (TREE_PUBLIC (decl))
1804 maybe_assemble_visibility (decl);
1806 if (DECL_PRESERVE_P (decl))
1807 targetm.asm_out.mark_decl_preserved (name);
1809 /* First make the assembler name(s) global if appropriate. */
1810 sect = get_variable_section (decl, false);
1811 if (TREE_PUBLIC (decl)
1813 && (sect->common.flags & SECTION_COMMON) == 0)
1814 globalize_decl (decl);
1816 /* Output any data that we will need to use the address of. */
1817 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
1818 output_addressed_constants (DECL_INITIAL (decl));
1820 /* dbxout.c needs to know this. */
1821 if (sect && (sect->common.flags & SECTION_CODE) != 0)
1822 DECL_IN_TEXT_SECTION (decl) = 1;
1824 /* If the decl is part of an object_block, make sure that the decl
1825 has been positioned within its block, but do not write out its
1826 definition yet. output_object_blocks will do that later. */
1827 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
1829 gcc_assert (!dont_output_data);
1830 place_block_symbol (symbol);
1832 else if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
1833 assemble_noswitch_variable (decl, name, sect);
1836 switch_to_section (sect);
1837 if (align > BITS_PER_UNIT)
1838 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (DECL_ALIGN_UNIT (decl)));
1839 assemble_variable_contents (decl, name, dont_output_data);
1843 /* Return 1 if type TYPE contains any pointers. */
1846 contains_pointers_p (tree type)
1848 switch (TREE_CODE (type))
1851 case REFERENCE_TYPE:
1852 /* I'm not sure whether OFFSET_TYPE needs this treatment,
1853 so I'll play safe and return 1. */
1859 case QUAL_UNION_TYPE:
1862 /* For a type that has fields, see if the fields have pointers. */
1863 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
1864 if (TREE_CODE (fields) == FIELD_DECL
1865 && contains_pointers_p (TREE_TYPE (fields)))
1871 /* An array type contains pointers if its element type does. */
1872 return contains_pointers_p (TREE_TYPE (type));
1879 /* In unit-at-a-time mode, we delay assemble_external processing until
1880 the compilation unit is finalized. This is the best we can do for
1881 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
1882 it all the way to final. See PR 17982 for further discussion. */
1883 static GTY(()) tree pending_assemble_externals;
1885 #ifdef ASM_OUTPUT_EXTERNAL
1886 /* True if DECL is a function decl for which no out-of-line copy exists.
1887 It is assumed that DECL's assembler name has been set. */
1890 incorporeal_function_p (tree decl)
1892 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1896 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
1897 && DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA)
1900 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1901 if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0)
1907 /* Actually do the tests to determine if this is necessary, and invoke
1908 ASM_OUTPUT_EXTERNAL. */
1910 assemble_external_real (tree decl)
1912 rtx rtl = DECL_RTL (decl);
1914 if (MEM_P (rtl) && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
1915 && !SYMBOL_REF_USED (XEXP (rtl, 0))
1916 && !incorporeal_function_p (decl))
1918 /* Some systems do require some output. */
1919 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
1920 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
1926 process_pending_assemble_externals (void)
1928 #ifdef ASM_OUTPUT_EXTERNAL
1930 for (list = pending_assemble_externals; list; list = TREE_CHAIN (list))
1931 assemble_external_real (TREE_VALUE (list));
1933 pending_assemble_externals = 0;
1937 /* Output something to declare an external symbol to the assembler.
1938 (Most assemblers don't need this, so we normally output nothing.)
1939 Do nothing if DECL is not external. */
1942 assemble_external (tree decl ATTRIBUTE_UNUSED)
1944 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
1945 main body of this code is only rarely exercised. To provide some
1946 testing, on all platforms, we make sure that the ASM_OUT_FILE is
1947 open. If it's not, we should not be calling this function. */
1948 gcc_assert (asm_out_file);
1950 #ifdef ASM_OUTPUT_EXTERNAL
1951 if (!DECL_P (decl) || !DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
1954 if (flag_unit_at_a_time)
1955 pending_assemble_externals = tree_cons (0, decl,
1956 pending_assemble_externals);
1958 assemble_external_real (decl);
1962 /* Similar, for calling a library function FUN. */
1965 assemble_external_libcall (rtx fun)
1967 /* Declare library function name external when first used, if nec. */
1968 if (! SYMBOL_REF_USED (fun))
1970 SYMBOL_REF_USED (fun) = 1;
1971 targetm.asm_out.external_libcall (fun);
1975 /* Assemble a label named NAME. */
1978 assemble_label (const char *name)
1980 ASM_OUTPUT_LABEL (asm_out_file, name);
1983 /* Set the symbol_referenced flag for ID. */
1985 mark_referenced (tree id)
1987 TREE_SYMBOL_REFERENCED (id) = 1;
1990 /* Set the symbol_referenced flag for DECL and notify callgraph. */
1992 mark_decl_referenced (tree decl)
1994 if (TREE_CODE (decl) == FUNCTION_DECL)
1996 /* Extern inline functions don't become needed when referenced.
1997 If we know a method will be emitted in other TU and no new
1998 functions can be marked reachable, just use the external
2000 struct cgraph_node *node = cgraph_node (decl);
2001 if (!DECL_EXTERNAL (decl)
2002 && (!node->local.vtable_method || !cgraph_global_info_ready
2003 || !node->local.finalized))
2004 cgraph_mark_needed_node (node);
2006 else if (TREE_CODE (decl) == VAR_DECL)
2008 struct cgraph_varpool_node *node = cgraph_varpool_node (decl);
2009 cgraph_varpool_mark_needed_node (node);
2010 /* C++ frontend use mark_decl_references to force COMDAT variables
2011 to be output that might appear dead otherwise. */
2012 node->force_output = true;
2014 /* else do nothing - we can get various sorts of CST nodes here,
2015 which do not need to be marked. */
2019 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2020 until we find an identifier that is not itself a transparent alias.
2021 Modify the alias passed to it by reference (and all aliases on the
2022 way to the ultimate target), such that they do not have to be
2023 followed again, and return the ultimate target of the alias
2027 ultimate_transparent_alias_target (tree *alias)
2029 tree target = *alias;
2031 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
2033 gcc_assert (TREE_CHAIN (target));
2034 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
2035 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
2036 && ! TREE_CHAIN (target));
2043 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2044 starts with a *, the rest of NAME is output verbatim. Otherwise
2045 NAME is transformed in a target-specific way (usually by the
2046 addition of an underscore). */
2049 assemble_name_raw (FILE *file, const char *name)
2052 fputs (&name[1], file);
2054 ASM_OUTPUT_LABELREF (file, name);
2057 /* Like assemble_name_raw, but should be used when NAME might refer to
2058 an entity that is also represented as a tree (like a function or
2059 variable). If NAME does refer to such an entity, that entity will
2060 be marked as referenced. */
2063 assemble_name (FILE *file, const char *name)
2065 const char *real_name;
2068 real_name = targetm.strip_name_encoding (name);
2070 id = maybe_get_identifier (real_name);
2075 mark_referenced (id);
2076 ultimate_transparent_alias_target (&id);
2078 name = IDENTIFIER_POINTER (id);
2079 gcc_assert (! TREE_CHAIN (id));
2082 assemble_name_raw (file, name);
2085 /* Allocate SIZE bytes writable static space with a gensym name
2086 and return an RTX to refer to its address. */
2089 assemble_static_space (unsigned HOST_WIDE_INT size)
2092 const char *namestring;
2095 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2097 namestring = ggc_strdup (name);
2099 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2100 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2102 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2103 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2106 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2107 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2110 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2111 so that each uninitialized object starts on such a boundary. */
2112 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2113 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2114 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2115 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2116 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2117 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2124 /* Assemble the static constant template for function entry trampolines.
2125 This is done at most once per compilation.
2126 Returns an RTX for the address of the template. */
2128 static GTY(()) rtx initial_trampoline;
2130 #ifdef TRAMPOLINE_TEMPLATE
2132 assemble_trampoline_template (void)
2139 if (initial_trampoline)
2140 return initial_trampoline;
2142 /* By default, put trampoline templates in read-only data section. */
2144 #ifdef TRAMPOLINE_SECTION
2145 switch_to_section (TRAMPOLINE_SECTION);
2147 switch_to_section (readonly_data_section);
2150 /* Write the assembler code to define one. */
2151 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2154 ASM_OUTPUT_ALIGN (asm_out_file, align);
2157 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2158 TRAMPOLINE_TEMPLATE (asm_out_file);
2160 /* Record the rtl to refer to it. */
2161 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2162 name = ggc_strdup (label);
2163 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2164 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2166 initial_trampoline = gen_rtx_MEM (BLKmode, symbol);
2167 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2169 return initial_trampoline;
2173 /* A and B are either alignments or offsets. Return the minimum alignment
2174 that may be assumed after adding the two together. */
2176 static inline unsigned
2177 min_align (unsigned int a, unsigned int b)
2179 return (a | b) & -(a | b);
2182 /* Return the assembler directive for creating a given kind of integer
2183 object. SIZE is the number of bytes in the object and ALIGNED_P
2184 indicates whether it is known to be aligned. Return NULL if the
2185 assembly dialect has no such directive.
2187 The returned string should be printed at the start of a new line and
2188 be followed immediately by the object's initial value. */
2191 integer_asm_op (int size, int aligned_p)
2193 struct asm_int_op *ops;
2196 ops = &targetm.asm_out.aligned_op;
2198 ops = &targetm.asm_out.unaligned_op;
2203 return targetm.asm_out.byte_op;
2217 /* Use directive OP to assemble an integer object X. Print OP at the
2218 start of the line, followed immediately by the value of X. */
2221 assemble_integer_with_op (const char *op, rtx x)
2223 fputs (op, asm_out_file);
2224 output_addr_const (asm_out_file, x);
2225 fputc ('\n', asm_out_file);
2228 /* The default implementation of the asm_out.integer target hook. */
2231 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2232 unsigned int size ATTRIBUTE_UNUSED,
2233 int aligned_p ATTRIBUTE_UNUSED)
2235 const char *op = integer_asm_op (size, aligned_p);
2236 /* Avoid GAS bugs for large values. Specifically negative values whose
2237 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2238 if (size > UNITS_PER_WORD && size > POINTER_SIZE / BITS_PER_UNIT)
2240 return op && (assemble_integer_with_op (op, x), true);
2243 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2244 the alignment of the integer in bits. Return 1 if we were able to output
2245 the constant, otherwise 0. We must be able to output the constant,
2246 if FORCE is nonzero. */
2249 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2253 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2255 /* See if the target hook can handle this kind of object. */
2256 if (targetm.asm_out.integer (x, size, aligned_p))
2259 /* If the object is a multi-byte one, try splitting it up. Split
2260 it into words it if is multi-word, otherwise split it into bytes. */
2263 enum machine_mode omode, imode;
2264 unsigned int subalign;
2265 unsigned int subsize, i;
2267 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2268 subalign = MIN (align, subsize * BITS_PER_UNIT);
2269 omode = mode_for_size (subsize * BITS_PER_UNIT, MODE_INT, 0);
2270 imode = mode_for_size (size * BITS_PER_UNIT, MODE_INT, 0);
2272 for (i = 0; i < size; i += subsize)
2274 rtx partial = simplify_subreg (omode, x, imode, i);
2275 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2281 /* If we've printed some of it, but not all of it, there's no going
2286 gcc_assert (!force);
2292 assemble_real (REAL_VALUE_TYPE d, enum machine_mode mode, unsigned int align)
2294 long data[4] = {0, 0, 0, 0};
2296 int bitsize, nelts, nunits, units_per;
2298 /* This is hairy. We have a quantity of known size. real_to_target
2299 will put it into an array of *host* longs, 32 bits per element
2300 (even if long is more than 32 bits). We need to determine the
2301 number of array elements that are occupied (nelts) and the number
2302 of *target* min-addressable units that will be occupied in the
2303 object file (nunits). We cannot assume that 32 divides the
2304 mode's bitsize (size * BITS_PER_UNIT) evenly.
2306 size * BITS_PER_UNIT is used here to make sure that padding bits
2307 (which might appear at either end of the value; real_to_target
2308 will include the padding bits in its output array) are included. */
2310 nunits = GET_MODE_SIZE (mode);
2311 bitsize = nunits * BITS_PER_UNIT;
2312 nelts = CEIL (bitsize, 32);
2313 units_per = 32 / BITS_PER_UNIT;
2315 real_to_target (data, &d, mode);
2317 /* Put out the first word with the specified alignment. */
2318 assemble_integer (GEN_INT (data[0]), MIN (nunits, units_per), align, 1);
2319 nunits -= units_per;
2321 /* Subsequent words need only 32-bit alignment. */
2322 align = min_align (align, 32);
2324 for (i = 1; i < nelts; i++)
2326 assemble_integer (GEN_INT (data[i]), MIN (nunits, units_per), align, 1);
2327 nunits -= units_per;
2331 /* Given an expression EXP with a constant value,
2332 reduce it to the sum of an assembler symbol and an integer.
2333 Store them both in the structure *VALUE.
2334 EXP must be reducible. */
2336 struct addr_const GTY(())
2339 HOST_WIDE_INT offset;
2343 decode_addr_const (tree exp, struct addr_const *value)
2345 tree target = TREE_OPERAND (exp, 0);
2351 if (TREE_CODE (target) == COMPONENT_REF
2352 && host_integerp (byte_position (TREE_OPERAND (target, 1)), 0))
2355 offset += int_byte_position (TREE_OPERAND (target, 1));
2356 target = TREE_OPERAND (target, 0);
2358 else if (TREE_CODE (target) == ARRAY_REF
2359 || TREE_CODE (target) == ARRAY_RANGE_REF)
2361 offset += (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target)), 1)
2362 * tree_low_cst (TREE_OPERAND (target, 1), 0));
2363 target = TREE_OPERAND (target, 0);
2369 switch (TREE_CODE (target))
2373 x = DECL_RTL (target);
2377 x = gen_rtx_MEM (FUNCTION_MODE,
2378 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2386 x = output_constant_def (target, 1);
2393 gcc_assert (MEM_P (x));
2397 value->offset = offset;
2400 /* Uniquize all constants that appear in memory.
2401 Each constant in memory thus far output is recorded
2402 in `const_desc_table'. */
2404 struct constant_descriptor_tree GTY(())
2406 /* A MEM for the constant. */
2409 /* The value of the constant. */
2412 /* Hash of value. Computing the hash from value each time
2413 hashfn is called can't work properly, as that means recursive
2414 use of the hash table during hash table expansion. */
2418 static GTY((param_is (struct constant_descriptor_tree)))
2419 htab_t const_desc_htab;
2421 static struct constant_descriptor_tree * build_constant_desc (tree);
2422 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2424 /* Compute a hash code for a constant expression. */
2427 const_desc_hash (const void *ptr)
2429 return ((struct constant_descriptor_tree *)ptr)->hash;
2433 const_hash_1 (const tree exp)
2438 enum tree_code code = TREE_CODE (exp);
2440 /* Either set P and LEN to the address and len of something to hash and
2441 exit the switch or return a value. */
2446 p = (char *) &TREE_INT_CST (exp);
2447 len = sizeof TREE_INT_CST (exp);
2451 return real_hash (TREE_REAL_CST_PTR (exp));
2454 p = TREE_STRING_POINTER (exp);
2455 len = TREE_STRING_LENGTH (exp);
2459 return (const_hash_1 (TREE_REALPART (exp)) * 5
2460 + const_hash_1 (TREE_IMAGPART (exp)));
2464 unsigned HOST_WIDE_INT idx;
2467 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2469 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
2471 hi = hi * 603 + const_hash_1 (value);
2479 struct addr_const value;
2481 decode_addr_const (exp, &value);
2482 switch (GET_CODE (value.base))
2485 /* Don't hash the address of the SYMBOL_REF;
2486 only use the offset and the symbol name. */
2488 p = XSTR (value.base, 0);
2489 for (i = 0; p[i] != 0; i++)
2490 hi = ((hi * 613) + (unsigned) (p[i]));
2494 hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
2505 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2506 + const_hash_1 (TREE_OPERAND (exp, 1)));
2510 case NON_LVALUE_EXPR:
2511 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2514 /* A language specific constant. Just hash the code. */
2518 /* Compute hashing function. */
2520 for (i = 0; i < len; i++)
2521 hi = ((hi * 613) + (unsigned) (p[i]));
2526 /* Wrapper of compare_constant, for the htab interface. */
2528 const_desc_eq (const void *p1, const void *p2)
2530 const struct constant_descriptor_tree *c1 = p1;
2531 const struct constant_descriptor_tree *c2 = p2;
2532 if (c1->hash != c2->hash)
2534 return compare_constant (c1->value, c2->value);
2537 /* Compare t1 and t2, and return 1 only if they are known to result in
2538 the same bit pattern on output. */
2541 compare_constant (const tree t1, const tree t2)
2543 enum tree_code typecode;
2545 if (t1 == NULL_TREE)
2546 return t2 == NULL_TREE;
2547 if (t2 == NULL_TREE)
2550 if (TREE_CODE (t1) != TREE_CODE (t2))
2553 switch (TREE_CODE (t1))
2556 /* Integer constants are the same only if the same width of type. */
2557 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2559 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2561 return tree_int_cst_equal (t1, t2);
2564 /* Real constants are the same only if the same width of type. */
2565 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2568 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
2571 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2574 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
2575 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
2576 TREE_STRING_LENGTH (t1)));
2579 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
2580 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
2584 VEC(constructor_elt, gc) *v1, *v2;
2585 unsigned HOST_WIDE_INT idx;
2587 typecode = TREE_CODE (TREE_TYPE (t1));
2588 if (typecode != TREE_CODE (TREE_TYPE (t2)))
2591 if (typecode == ARRAY_TYPE)
2593 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
2594 /* For arrays, check that the sizes all match. */
2595 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
2597 || size_1 != int_size_in_bytes (TREE_TYPE (t2)))
2602 /* For record and union constructors, require exact type
2604 if (TREE_TYPE (t1) != TREE_TYPE (t2))
2608 v1 = CONSTRUCTOR_ELTS (t1);
2609 v2 = CONSTRUCTOR_ELTS (t2);
2610 if (VEC_length (constructor_elt, v1)
2611 != VEC_length (constructor_elt, v2))
2614 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
2616 constructor_elt *c1 = VEC_index (constructor_elt, v1, idx);
2617 constructor_elt *c2 = VEC_index (constructor_elt, v2, idx);
2619 /* Check that each value is the same... */
2620 if (!compare_constant (c1->value, c2->value))
2622 /* ... and that they apply to the same fields! */
2623 if (typecode == ARRAY_TYPE)
2625 if (!compare_constant (c1->index, c2->index))
2630 if (c1->index != c2->index)
2641 struct addr_const value1, value2;
2643 decode_addr_const (t1, &value1);
2644 decode_addr_const (t2, &value2);
2645 return (value1.offset == value2.offset
2646 && strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
2652 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
2653 && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
2657 case NON_LVALUE_EXPR:
2658 case VIEW_CONVERT_EXPR:
2659 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
2664 nt1 = lang_hooks.expand_constant (t1);
2665 nt2 = lang_hooks.expand_constant (t2);
2666 if (nt1 != t1 || nt2 != t2)
2667 return compare_constant (nt1, nt2);
2676 /* Make a copy of the whole tree structure for a constant. This
2677 handles the same types of nodes that compare_constant handles. */
2680 copy_constant (tree exp)
2682 switch (TREE_CODE (exp))
2685 /* For ADDR_EXPR, we do not want to copy the decl whose address
2686 is requested. We do want to copy constants though. */
2687 if (CONSTANT_CLASS_P (TREE_OPERAND (exp, 0)))
2688 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2689 copy_constant (TREE_OPERAND (exp, 0)));
2691 return copy_node (exp);
2696 return copy_node (exp);
2699 return build_complex (TREE_TYPE (exp),
2700 copy_constant (TREE_REALPART (exp)),
2701 copy_constant (TREE_IMAGPART (exp)));
2705 return build2 (TREE_CODE (exp), TREE_TYPE (exp),
2706 copy_constant (TREE_OPERAND (exp, 0)),
2707 copy_constant (TREE_OPERAND (exp, 1)));
2711 case NON_LVALUE_EXPR:
2712 case VIEW_CONVERT_EXPR:
2713 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2714 copy_constant (TREE_OPERAND (exp, 0)));
2718 tree copy = copy_node (exp);
2719 VEC(constructor_elt, gc) *v;
2720 unsigned HOST_WIDE_INT idx;
2721 tree purpose, value;
2723 v = VEC_alloc(constructor_elt, gc, VEC_length(constructor_elt,
2724 CONSTRUCTOR_ELTS (exp)));
2725 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, purpose, value)
2727 constructor_elt *ce = VEC_quick_push (constructor_elt, v, NULL);
2728 ce->index = purpose;
2729 ce->value = copy_constant (value);
2731 CONSTRUCTOR_ELTS (copy) = v;
2737 tree t = lang_hooks.expand_constant (exp);
2739 gcc_assert (t == exp);
2740 return copy_constant (t);
2745 /* Return the alignment of constant EXP in bits. */
2748 get_constant_alignment (tree exp)
2752 align = TYPE_ALIGN (TREE_TYPE (exp));
2753 #ifdef CONSTANT_ALIGNMENT
2754 align = CONSTANT_ALIGNMENT (exp, align);
2759 /* Return the section into which constant EXP should be placed. */
2762 get_constant_section (tree exp)
2764 if (IN_NAMED_SECTION (exp))
2765 return get_named_section (exp, NULL, compute_reloc_for_constant (exp));
2767 return targetm.asm_out.select_section (exp,
2768 compute_reloc_for_constant (exp),
2769 get_constant_alignment (exp));
2772 /* Return the size of constant EXP in bytes. */
2774 static HOST_WIDE_INT
2775 get_constant_size (tree exp)
2779 size = int_size_in_bytes (TREE_TYPE (exp));
2780 if (TREE_CODE (exp) == STRING_CST)
2781 size = MAX (TREE_STRING_LENGTH (exp), size);
2785 /* Subroutine of output_constant_def:
2786 No constant equal to EXP is known to have been output.
2787 Make a constant descriptor to enter EXP in the hash table.
2788 Assign the label number and construct RTL to refer to the
2789 constant's location in memory.
2790 Caller is responsible for updating the hash table. */
2792 static struct constant_descriptor_tree *
2793 build_constant_desc (tree exp)
2799 struct constant_descriptor_tree *desc;
2801 desc = ggc_alloc (sizeof (*desc));
2802 desc->value = copy_constant (exp);
2804 /* Propagate marked-ness to copied constant. */
2805 if (flag_mudflap && mf_marked_p (exp))
2806 mf_mark (desc->value);
2808 /* Create a string containing the label name, in LABEL. */
2809 labelno = const_labelno++;
2810 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
2812 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
2813 if (use_object_blocks_p ())
2815 section *sect = get_constant_section (exp);
2816 symbol = create_block_symbol (ggc_strdup (label),
2817 get_block_for_section (sect), -1);
2820 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
2821 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
2822 SET_SYMBOL_REF_DECL (symbol, desc->value);
2823 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
2825 rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), symbol);
2826 set_mem_attributes (rtl, exp, 1);
2827 set_mem_alias_set (rtl, 0);
2828 set_mem_alias_set (rtl, const_alias_set);
2830 /* Set flags or add text to the name to record information, such as
2831 that it is a local symbol. If the name is changed, the macro
2832 ASM_OUTPUT_LABELREF will have to know how to strip this
2833 information. This call might invalidate our local variable
2834 SYMBOL; we can't use it afterward. */
2836 targetm.encode_section_info (exp, rtl, true);
2843 /* Return an rtx representing a reference to constant data in memory
2844 for the constant expression EXP.
2846 If assembler code for such a constant has already been output,
2847 return an rtx to refer to it.
2848 Otherwise, output such a constant in memory
2849 and generate an rtx for it.
2851 If DEFER is nonzero, this constant can be deferred and output only
2852 if referenced in the function after all optimizations.
2854 `const_desc_table' records which constants already have label strings. */
2857 output_constant_def (tree exp, int defer)
2859 struct constant_descriptor_tree *desc;
2860 struct constant_descriptor_tree key;
2863 /* Look up EXP in the table of constant descriptors. If we didn't find
2864 it, create a new one. */
2866 key.hash = const_hash_1 (exp);
2867 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
2872 desc = build_constant_desc (exp);
2873 desc->hash = key.hash;
2877 maybe_output_constant_def_contents (desc, defer);
2881 /* Subroutine of output_constant_def: Decide whether or not we need to
2882 output the constant DESC now, and if so, do it. */
2884 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
2887 rtx symbol = XEXP (desc->rtl, 0);
2888 tree exp = desc->value;
2890 if (flag_syntax_only)
2893 if (TREE_ASM_WRITTEN (exp))
2894 /* Already output; don't do it again. */
2897 /* We can always defer constants as long as the context allows
2901 /* Increment n_deferred_constants if it exists. It needs to be at
2902 least as large as the number of constants actually referred to
2903 by the function. If it's too small we'll stop looking too early
2904 and fail to emit constants; if it's too large we'll only look
2905 through the entire function when we could have stopped earlier. */
2907 n_deferred_constants++;
2911 output_constant_def_contents (symbol);
2914 /* Subroutine of output_constant_def_contents. Output the definition
2915 of constant EXP, which is pointed to by label LABEL. ALIGN is the
2916 constant's alignment in bits. */
2919 assemble_constant_contents (tree exp, const char *label, unsigned int align)
2923 size = get_constant_size (exp);
2925 /* Do any machine/system dependent processing of the constant. */
2926 #ifdef ASM_DECLARE_CONSTANT_NAME
2927 ASM_DECLARE_CONSTANT_NAME (asm_out_file, label, exp, size);
2929 /* Standard thing is just output label for the constant. */
2930 ASM_OUTPUT_LABEL (asm_out_file, label);
2931 #endif /* ASM_DECLARE_CONSTANT_NAME */
2933 /* Output the value of EXP. */
2934 output_constant (exp, size, align);
2937 /* We must output the constant data referred to by SYMBOL; do so. */
2940 output_constant_def_contents (rtx symbol)
2942 tree exp = SYMBOL_REF_DECL (symbol);
2945 /* Make sure any other constants whose addresses appear in EXP
2946 are assigned label numbers. */
2947 output_addressed_constants (exp);
2949 /* We are no longer deferring this constant. */
2950 TREE_ASM_WRITTEN (exp) = 1;
2952 /* If the constant is part of an object block, make sure that the
2953 decl has been positioned within its block, but do not write out
2954 its definition yet. output_object_blocks will do that later. */
2955 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
2956 place_block_symbol (symbol);
2959 switch_to_section (get_constant_section (exp));
2960 align = get_constant_alignment (exp);
2961 if (align > BITS_PER_UNIT)
2962 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
2963 assemble_constant_contents (exp, XSTR (symbol, 0), align);
2966 mudflap_enqueue_constant (exp);
2969 /* Look up EXP in the table of constant descriptors. Return the rtl
2970 if it has been emitted, else null. */
2973 lookup_constant_def (tree exp)
2975 struct constant_descriptor_tree *desc;
2976 struct constant_descriptor_tree key;
2979 key.hash = const_hash_1 (exp);
2980 desc = htab_find_with_hash (const_desc_htab, &key, key.hash);
2982 return (desc ? desc->rtl : NULL_RTX);
2985 /* Used in the hash tables to avoid outputting the same constant
2986 twice. Unlike 'struct constant_descriptor_tree', RTX constants
2987 are output once per function, not once per file. */
2988 /* ??? Only a few targets need per-function constant pools. Most
2989 can use one per-file pool. Should add a targetm bit to tell the
2992 struct rtx_constant_pool GTY(())
2994 /* Pointers to first and last constant in pool, as ordered by offset. */
2995 struct constant_descriptor_rtx *first;
2996 struct constant_descriptor_rtx *last;
2998 /* Hash facility for making memory-constants from constant rtl-expressions.
2999 It is used on RISC machines where immediate integer arguments and
3000 constant addresses are restricted so that such constants must be stored
3002 htab_t GTY((param_is (struct constant_descriptor_rtx))) const_rtx_htab;
3004 /* Current offset in constant pool (does not include any
3005 machine-specific header). */
3006 HOST_WIDE_INT offset;
3009 struct constant_descriptor_rtx GTY((chain_next ("%h.next")))
3011 struct constant_descriptor_rtx *next;
3015 HOST_WIDE_INT offset;
3017 enum machine_mode mode;
3023 /* Hash and compare functions for const_rtx_htab. */
3026 const_desc_rtx_hash (const void *ptr)
3028 const struct constant_descriptor_rtx *desc = ptr;
3033 const_desc_rtx_eq (const void *a, const void *b)
3035 const struct constant_descriptor_rtx *x = a;
3036 const struct constant_descriptor_rtx *y = b;
3038 if (x->mode != y->mode)
3040 return rtx_equal_p (x->constant, y->constant);
3043 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3046 const_rtx_hash_1 (rtx *xp, void *data)
3048 unsigned HOST_WIDE_INT hwi;
3049 enum machine_mode mode;
3055 code = GET_CODE (x);
3056 mode = GET_MODE (x);
3057 h = (hashval_t) code * 1048573 + mode;
3065 const int shift = sizeof (hashval_t) * CHAR_BIT;
3066 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3069 h ^= (hashval_t) hwi;
3070 for (i = 1; i < n; ++i)
3073 h ^= (hashval_t) hwi;
3079 if (mode == VOIDmode)
3081 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3085 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3091 for (i = XVECLEN (x, 0); i-- > 0; )
3092 h = h * 251 + const_rtx_hash_1 (&XVECEXP (x, 0, i), data);
3097 h ^= htab_hash_string (XSTR (x, 0));
3101 h = h * 251 + CODE_LABEL_NUMBER (XEXP (x, 0));
3105 case UNSPEC_VOLATILE:
3106 h = h * 251 + XINT (x, 1);
3114 *hp = *hp * 509 + h;
3118 /* Compute a hash value for X, which should be a constant. */
3121 const_rtx_hash (rtx x)
3124 for_each_rtx (&x, const_rtx_hash_1, &h);
3129 /* Create and return a new rtx constant pool. */
3131 static struct rtx_constant_pool *
3132 create_constant_pool (void)
3134 struct rtx_constant_pool *pool;
3136 pool = ggc_alloc (sizeof (struct rtx_constant_pool));
3137 pool->const_rtx_htab = htab_create_ggc (31, const_desc_rtx_hash,
3138 const_desc_rtx_eq, NULL);
3145 /* Initialize constant pool hashing for a new function. */
3148 init_varasm_status (struct function *f)
3150 struct varasm_status *p;
3152 p = ggc_alloc (sizeof (struct varasm_status));
3155 p->pool = create_constant_pool ();
3156 p->deferred_constants = 0;
3159 /* Given a MINUS expression, simplify it if both sides
3160 include the same symbol. */
3163 simplify_subtraction (rtx x)
3165 rtx r = simplify_rtx (x);
3169 /* Given a constant rtx X, make (or find) a memory constant for its value
3170 and return a MEM rtx to refer to it in memory. */
3173 force_const_mem (enum machine_mode mode, rtx x)
3175 struct constant_descriptor_rtx *desc, tmp;
3176 struct rtx_constant_pool *pool;
3183 /* If we're not allowed to drop X into the constant pool, don't. */
3184 if (targetm.cannot_force_const_mem (x))
3187 /* Record that this function has used a constant pool entry. */
3188 current_function_uses_const_pool = 1;
3190 /* Decide which pool to use. */
3191 pool = (targetm.use_blocks_for_constant_p (mode, x)
3192 ? shared_constant_pool
3193 : cfun->varasm->pool);
3195 /* Lookup the value in the hashtable. */
3198 hash = const_rtx_hash (x);
3199 slot = htab_find_slot_with_hash (pool->const_rtx_htab, &tmp, hash, INSERT);
3202 /* If the constant was already present, return its memory. */
3204 return copy_rtx (desc->mem);
3206 /* Otherwise, create a new descriptor. */
3207 desc = ggc_alloc (sizeof (*desc));
3210 /* Align the location counter as required by EXP's data type. */
3211 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3212 #ifdef CONSTANT_ALIGNMENT
3214 tree type = lang_hooks.types.type_for_mode (mode, 0);
3215 if (type != NULL_TREE)
3216 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3220 pool->offset += (align / BITS_PER_UNIT) - 1;
3221 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3224 desc->constant = tmp.constant;
3225 desc->offset = pool->offset;
3228 desc->align = align;
3229 desc->labelno = const_labelno;
3232 pool->offset += GET_MODE_SIZE (mode);
3234 pool->last->next = desc;
3236 pool->first = pool->last = desc;
3239 /* Create a string containing the label name, in LABEL. */
3240 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3243 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3244 the constants pool. */
3245 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3247 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3248 symbol = create_block_symbol (ggc_strdup (label),
3249 get_block_for_section (sect), -1);
3252 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3254 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3255 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3256 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3258 /* Construct the MEM. */
3259 desc->mem = def = gen_const_mem (mode, symbol);
3260 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3261 set_mem_align (def, align);
3263 /* If we're dropping a label to the constant pool, make sure we
3265 if (GET_CODE (x) == LABEL_REF)
3266 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3268 return copy_rtx (def);
3271 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3274 get_pool_constant (rtx addr)
3276 return SYMBOL_REF_CONSTANT (addr)->constant;
3279 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3280 and whether it has been output or not. */
3283 get_pool_constant_mark (rtx addr, bool *pmarked)
3285 struct constant_descriptor_rtx *desc;
3287 desc = SYMBOL_REF_CONSTANT (addr);
3288 *pmarked = (desc->mark != 0);
3289 return desc->constant;
3292 /* Similar, return the mode. */
3295 get_pool_mode (rtx addr)
3297 return SYMBOL_REF_CONSTANT (addr)->mode;
3300 /* Return the size of the constant pool. */
3303 get_pool_size (void)
3305 return cfun->varasm->pool->offset;
3308 /* Worker function for output_constant_pool_1. Emit assembly for X
3309 in MODE with known alignment ALIGN. */
3312 output_constant_pool_2 (enum machine_mode mode, rtx x, unsigned int align)
3314 switch (GET_MODE_CLASS (mode))
3317 case MODE_DECIMAL_FLOAT:
3321 gcc_assert (GET_CODE (x) == CONST_DOUBLE);
3322 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
3323 assemble_real (r, mode, align);
3328 case MODE_PARTIAL_INT:
3329 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3332 case MODE_VECTOR_FLOAT:
3333 case MODE_VECTOR_INT:
3336 enum machine_mode submode = GET_MODE_INNER (mode);
3337 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3339 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3340 units = CONST_VECTOR_NUNITS (x);
3342 for (i = 0; i < units; i++)
3344 rtx elt = CONST_VECTOR_ELT (x, i);
3345 output_constant_pool_2 (submode, elt, i ? subalign : align);
3355 /* Worker function for output_constant_pool. Emit constant DESC,
3356 giving it ALIGN bits of alignment. */
3359 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3366 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3367 whose CODE_LABEL has been deleted. This can occur if a jump table
3368 is eliminated by optimization. If so, write a constant of zero
3369 instead. Note that this can also happen by turning the
3370 CODE_LABEL into a NOTE. */
3371 /* ??? This seems completely and utterly wrong. Certainly it's
3372 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3373 functioning even with INSN_DELETED_P and friends. */
3376 switch (GET_CODE (x))
3379 if (GET_CODE (XEXP (x, 0)) != PLUS
3380 || GET_CODE (XEXP (XEXP (x, 0), 0)) != LABEL_REF)
3382 tmp = XEXP (XEXP (x, 0), 0);
3387 gcc_assert (!INSN_DELETED_P (tmp));
3388 gcc_assert (!NOTE_P (tmp)
3389 || NOTE_LINE_NUMBER (tmp) != NOTE_INSN_DELETED);
3396 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3397 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3398 align, desc->labelno, done);
3401 assemble_align (align);
3403 /* Output the label. */
3404 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3406 /* Output the data. */
3407 output_constant_pool_2 (desc->mode, x, align);
3409 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3410 sections have proper size. */
3411 if (align > GET_MODE_BITSIZE (desc->mode)
3413 && (in_section->common.flags & SECTION_MERGE))
3414 assemble_align (align);
3416 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3422 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3423 to as used. Emit referenced deferred strings. This function can
3424 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3427 mark_constant (rtx *current_rtx, void *data ATTRIBUTE_UNUSED)
3429 rtx x = *current_rtx;
3431 if (x == NULL_RTX || GET_CODE (x) != SYMBOL_REF)
3434 if (CONSTANT_POOL_ADDRESS_P (x))
3436 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3437 if (desc->mark == 0)
3440 for_each_rtx (&desc->constant, mark_constant, NULL);
3443 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3445 tree exp = SYMBOL_REF_DECL (x);
3446 if (!TREE_ASM_WRITTEN (exp))
3448 n_deferred_constants--;
3449 output_constant_def_contents (x);
3456 /* Look through appropriate parts of INSN, marking all entries in the
3457 constant pool which are actually being used. Entries that are only
3458 referenced by other constants are also marked as used. Emit
3459 deferred strings that are used. */
3462 mark_constants (rtx insn)
3467 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3468 insns, not any notes that may be attached. We don't want to mark
3469 a constant just because it happens to appear in a REG_EQUIV note. */
3470 if (GET_CODE (PATTERN (insn)) == SEQUENCE)
3472 rtx seq = PATTERN (insn);
3473 int i, n = XVECLEN (seq, 0);
3474 for (i = 0; i < n; ++i)
3476 rtx subinsn = XVECEXP (seq, 0, i);
3477 if (INSN_P (subinsn))
3478 for_each_rtx (&PATTERN (subinsn), mark_constant, NULL);
3482 for_each_rtx (&PATTERN (insn), mark_constant, NULL);
3485 /* Look through the instructions for this function, and mark all the
3486 entries in POOL which are actually being used. Emit deferred constants
3487 which have indeed been used. */
3490 mark_constant_pool (void)
3494 if (!current_function_uses_const_pool && n_deferred_constants == 0)
3497 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3498 mark_constants (insn);
3500 for (link = current_function_epilogue_delay_list;
3502 link = XEXP (link, 1))
3503 mark_constants (XEXP (link, 0));
3506 /* Write all the constants in POOL. */
3509 output_constant_pool_contents (struct rtx_constant_pool *pool)
3511 struct constant_descriptor_rtx *desc;
3513 for (desc = pool->first; desc ; desc = desc->next)
3516 /* If the constant is part of an object_block, make sure that
3517 the constant has been positioned within its block, but do not
3518 write out its definition yet. output_object_blocks will do
3520 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc->sym)
3521 && SYMBOL_REF_BLOCK (desc->sym))
3522 place_block_symbol (desc->sym);
3525 switch_to_section (targetm.asm_out.select_rtx_section
3526 (desc->mode, desc->constant, desc->align));
3527 output_constant_pool_1 (desc, desc->align);
3532 /* Mark all constants that are used in the current function, then write
3533 out the function's private constant pool. */
3536 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
3537 tree fndecl ATTRIBUTE_UNUSED)
3539 struct rtx_constant_pool *pool = cfun->varasm->pool;
3541 /* It is possible for gcc to call force_const_mem and then to later
3542 discard the instructions which refer to the constant. In such a
3543 case we do not need to output the constant. */
3544 mark_constant_pool ();
3546 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3547 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
3550 output_constant_pool_contents (pool);
3552 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3553 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
3557 /* Write the contents of the shared constant pool. */
3560 output_shared_constant_pool (void)
3562 output_constant_pool_contents (shared_constant_pool);
3565 /* Determine what kind of relocations EXP may need. */
3568 compute_reloc_for_constant (tree exp)
3570 int reloc = 0, reloc2;
3573 /* Give the front-end a chance to convert VALUE to something that
3574 looks more like a constant to the back-end. */
3575 exp = lang_hooks.expand_constant (exp);
3577 switch (TREE_CODE (exp))
3581 /* Go inside any operations that get_inner_reference can handle and see
3582 if what's inside is a constant: no need to do anything here for
3583 addresses of variables or functions. */
3584 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3585 tem = TREE_OPERAND (tem, 0))
3588 if (TREE_PUBLIC (tem))
3595 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3596 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3600 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3601 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3602 /* The difference of two local labels is computable at link time. */
3603 if (reloc == 1 && reloc2 == 1)
3611 case NON_LVALUE_EXPR:
3612 case VIEW_CONVERT_EXPR:
3613 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3618 unsigned HOST_WIDE_INT idx;
3619 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3621 reloc |= compute_reloc_for_constant (tem);
3631 /* Find all the constants whose addresses are referenced inside of EXP,
3632 and make sure assembler code with a label has been output for each one.
3633 Indicate whether an ADDR_EXPR has been encountered. */
3636 output_addressed_constants (tree exp)
3640 /* Give the front-end a chance to convert VALUE to something that
3641 looks more like a constant to the back-end. */
3642 exp = lang_hooks.expand_constant (exp);
3644 switch (TREE_CODE (exp))
3648 /* Go inside any operations that get_inner_reference can handle and see
3649 if what's inside is a constant: no need to do anything here for
3650 addresses of variables or functions. */
3651 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3652 tem = TREE_OPERAND (tem, 0))
3655 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3656 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
3657 tem = DECL_INITIAL (tem);
3659 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
3660 output_constant_def (tem, 0);
3665 output_addressed_constants (TREE_OPERAND (exp, 1));
3670 case NON_LVALUE_EXPR:
3671 case VIEW_CONVERT_EXPR:
3672 output_addressed_constants (TREE_OPERAND (exp, 0));
3677 unsigned HOST_WIDE_INT idx;
3678 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3680 output_addressed_constants (tem);
3689 /* Return nonzero if VALUE is a valid constant-valued expression
3690 for use in initializing a static variable; one that can be an
3691 element of a "constant" initializer.
3693 Return null_pointer_node if the value is absolute;
3694 if it is relocatable, return the variable that determines the relocation.
3695 We assume that VALUE has been folded as much as possible;
3696 therefore, we do not need to check for such things as
3697 arithmetic-combinations of integers. */
3700 initializer_constant_valid_p (tree value, tree endtype)
3702 /* Give the front-end a chance to convert VALUE to something that
3703 looks more like a constant to the back-end. */
3704 value = lang_hooks.expand_constant (value);
3706 switch (TREE_CODE (value))
3709 if ((TREE_CODE (TREE_TYPE (value)) == UNION_TYPE
3710 || TREE_CODE (TREE_TYPE (value)) == RECORD_TYPE)
3711 && TREE_CONSTANT (value)
3712 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (value)))
3714 unsigned HOST_WIDE_INT idx;
3716 bool absolute = true;
3718 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
3721 reloc = initializer_constant_valid_p (elt, TREE_TYPE (elt));
3724 if (reloc != null_pointer_node)
3727 /* For a non-absolute relocation, there is no single
3728 variable that can be "the variable that determines the
3730 return absolute ? null_pointer_node : error_mark_node;
3733 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
3740 return null_pointer_node;
3744 value = staticp (TREE_OPERAND (value, 0));
3747 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out to
3748 be a constant, this is old-skool offsetof-like nonsense. */
3749 if (TREE_CODE (value) == INDIRECT_REF
3750 && TREE_CONSTANT (TREE_OPERAND (value, 0)))
3751 return null_pointer_node;
3752 /* Taking the address of a nested function involves a trampoline. */
3753 if (TREE_CODE (value) == FUNCTION_DECL
3754 && ((decl_function_context (value)
3755 && !DECL_NO_STATIC_CHAIN (value))
3756 || DECL_DLLIMPORT_P (value)))
3758 /* "&{...}" requires a temporary to hold the constructed
3760 if (TREE_CODE (value) == CONSTRUCTOR)
3765 case VIEW_CONVERT_EXPR:
3766 case NON_LVALUE_EXPR:
3767 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
3776 src = TREE_OPERAND (value, 0);
3777 src_type = TREE_TYPE (src);
3778 dest_type = TREE_TYPE (value);
3780 /* Allow conversions between pointer types, floating-point
3781 types, and offset types. */
3782 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
3783 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
3784 || (TREE_CODE (dest_type) == OFFSET_TYPE
3785 && TREE_CODE (src_type) == OFFSET_TYPE))
3786 return initializer_constant_valid_p (src, endtype);
3788 /* Allow length-preserving conversions between integer types. */
3789 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
3790 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
3791 return initializer_constant_valid_p (src, endtype);
3793 /* Allow conversions between other integer types only if
3795 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
3797 tree inner = initializer_constant_valid_p (src, endtype);
3798 if (inner == null_pointer_node)
3799 return null_pointer_node;
3803 /* Allow (int) &foo provided int is as wide as a pointer. */
3804 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
3805 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
3806 return initializer_constant_valid_p (src, endtype);
3808 /* Likewise conversions from int to pointers, but also allow
3809 conversions from 0. */
3810 if ((POINTER_TYPE_P (dest_type)
3811 || TREE_CODE (dest_type) == OFFSET_TYPE)
3812 && INTEGRAL_TYPE_P (src_type))
3814 if (TREE_CODE (src) == INTEGER_CST
3815 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
3816 return null_pointer_node;
3817 if (integer_zerop (src))
3818 return null_pointer_node;
3819 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
3820 return initializer_constant_valid_p (src, endtype);
3823 /* Allow conversions to struct or union types if the value
3825 if (TREE_CODE (dest_type) == RECORD_TYPE
3826 || TREE_CODE (dest_type) == UNION_TYPE)
3827 return initializer_constant_valid_p (src, endtype);
3832 if (! INTEGRAL_TYPE_P (endtype)
3833 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
3835 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
3837 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
3839 /* If either term is absolute, use the other terms relocation. */
3840 if (valid0 == null_pointer_node)
3842 if (valid1 == null_pointer_node)
3848 if (! INTEGRAL_TYPE_P (endtype)
3849 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
3851 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
3853 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
3855 /* Win if second argument is absolute. */
3856 if (valid1 == null_pointer_node)
3858 /* Win if both arguments have the same relocation.
3859 Then the value is absolute. */
3860 if (valid0 == valid1 && valid0 != 0)
3861 return null_pointer_node;
3863 /* Since GCC guarantees that string constants are unique in the
3864 generated code, a subtraction between two copies of the same
3865 constant string is absolute. */
3866 if (valid0 && TREE_CODE (valid0) == STRING_CST
3867 && valid1 && TREE_CODE (valid1) == STRING_CST
3868 && operand_equal_p (valid0, valid1, 1))
3869 return null_pointer_node;
3872 /* Support narrowing differences. */
3873 if (INTEGRAL_TYPE_P (endtype))
3877 op0 = TREE_OPERAND (value, 0);
3878 op1 = TREE_OPERAND (value, 1);
3880 /* Like STRIP_NOPS except allow the operand mode to widen.
3881 This works around a feature of fold that simplifies
3882 (int)(p1 - p2) to ((int)p1 - (int)p2) under the theory
3883 that the narrower operation is cheaper. */
3885 while (TREE_CODE (op0) == NOP_EXPR
3886 || TREE_CODE (op0) == CONVERT_EXPR
3887 || TREE_CODE (op0) == NON_LVALUE_EXPR)
3889 tree inner = TREE_OPERAND (op0, 0);
3890 if (inner == error_mark_node
3891 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
3892 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
3893 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
3898 while (TREE_CODE (op1) == NOP_EXPR
3899 || TREE_CODE (op1) == CONVERT_EXPR
3900 || TREE_CODE (op1) == NON_LVALUE_EXPR)
3902 tree inner = TREE_OPERAND (op1, 0);
3903 if (inner == error_mark_node
3904 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
3905 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
3906 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
3911 op0 = initializer_constant_valid_p (op0, endtype);
3912 op1 = initializer_constant_valid_p (op1, endtype);
3914 /* Both initializers must be known. */
3918 return null_pointer_node;
3920 /* Support differences between labels. */
3921 if (TREE_CODE (op0) == LABEL_DECL
3922 && TREE_CODE (op1) == LABEL_DECL)
3923 return null_pointer_node;
3925 if (TREE_CODE (op0) == STRING_CST
3926 && TREE_CODE (op1) == STRING_CST
3927 && operand_equal_p (op0, op1, 1))
3928 return null_pointer_node;
3940 /* Output assembler code for constant EXP to FILE, with no label.
3941 This includes the pseudo-op such as ".int" or ".byte", and a newline.
3942 Assumes output_addressed_constants has been done on EXP already.
3944 Generate exactly SIZE bytes of assembler data, padding at the end
3945 with zeros if necessary. SIZE must always be specified.
3947 SIZE is important for structure constructors,
3948 since trailing members may have been omitted from the constructor.
3949 It is also important for initialization of arrays from string constants
3950 since the full length of the string constant might not be wanted.
3951 It is also needed for initialization of unions, where the initializer's
3952 type is just one member, and that may not be as long as the union.
3954 There a case in which we would fail to output exactly SIZE bytes:
3955 for a structure constructor that wants to produce more than SIZE bytes.
3956 But such constructors will never be generated for any possible input.
3958 ALIGN is the alignment of the data in bits. */
3961 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
3963 enum tree_code code;
3964 unsigned HOST_WIDE_INT thissize;
3966 /* Some front-ends use constants other than the standard language-independent
3967 varieties, but which may still be output directly. Give the front-end a
3968 chance to convert EXP to a language-independent representation. */
3969 exp = lang_hooks.expand_constant (exp);
3971 if (size == 0 || flag_syntax_only)
3974 /* See if we're trying to initialize a pointer in a non-default mode
3975 to the address of some declaration somewhere. If the target says
3976 the mode is valid for pointers, assume the target has a way of
3978 if (TREE_CODE (exp) == NOP_EXPR
3979 && POINTER_TYPE_P (TREE_TYPE (exp))
3980 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
3982 tree saved_type = TREE_TYPE (exp);
3984 /* Peel off any intermediate conversions-to-pointer for valid
3986 while (TREE_CODE (exp) == NOP_EXPR
3987 && POINTER_TYPE_P (TREE_TYPE (exp))
3988 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
3989 exp = TREE_OPERAND (exp, 0);
3991 /* If what we're left with is the address of something, we can
3992 convert the address to the final type and output it that
3994 if (TREE_CODE (exp) == ADDR_EXPR)
3995 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
3996 /* Likewise for constant ints. */
3997 else if (TREE_CODE (exp) == INTEGER_CST)
3998 exp = build_int_cst_wide (saved_type, TREE_INT_CST_LOW (exp),
3999 TREE_INT_CST_HIGH (exp));
4003 /* Eliminate any conversions since we'll be outputting the underlying
4005 while (TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
4006 || TREE_CODE (exp) == NON_LVALUE_EXPR
4007 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
4009 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
4010 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
4012 /* Make sure eliminating the conversion is really a no-op, except with
4013 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4014 union types to allow for Ada unchecked unions. */
4015 if (type_size > op_size
4016 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
4017 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
4018 internal_error ("no-op convert from %wd to %wd bytes in initializer",
4019 op_size, type_size);
4021 exp = TREE_OPERAND (exp, 0);
4024 code = TREE_CODE (TREE_TYPE (exp));
4025 thissize = int_size_in_bytes (TREE_TYPE (exp));
4027 /* Allow a constructor with no elements for any data type.
4028 This means to fill the space with zeros. */
4029 if (TREE_CODE (exp) == CONSTRUCTOR
4030 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (exp)))
4032 assemble_zeros (size);
4036 if (TREE_CODE (exp) == FDESC_EXPR)
4038 #ifdef ASM_OUTPUT_FDESC
4039 HOST_WIDE_INT part = tree_low_cst (TREE_OPERAND (exp, 1), 0);
4040 tree decl = TREE_OPERAND (exp, 0);
4041 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4048 /* Now output the underlying data. If we've handling the padding, return.
4049 Otherwise, break and ensure SIZE is the size written. */
4056 case REFERENCE_TYPE:
4058 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
4059 EXPAND_INITIALIZER),
4060 MIN (size, thissize), align, 0))
4061 error ("initializer for integer value is too complicated");
4065 if (TREE_CODE (exp) != REAL_CST)
4066 error ("initializer for floating value is not a floating constant");
4068 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)), align);
4072 output_constant (TREE_REALPART (exp), thissize / 2, align);
4073 output_constant (TREE_IMAGPART (exp), thissize / 2,
4074 min_align (align, BITS_PER_UNIT * (thissize / 2)));
4079 switch (TREE_CODE (exp))
4082 output_constructor (exp, size, align);
4085 thissize = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp),
4087 assemble_string (TREE_STRING_POINTER (exp), thissize);
4094 unsigned int nalign;
4095 enum machine_mode inner;
4097 inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4098 nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4100 elt_size = GET_MODE_SIZE (inner);
4102 link = TREE_VECTOR_CST_ELTS (exp);
4103 output_constant (TREE_VALUE (link), elt_size, align);
4104 while ((link = TREE_CHAIN (link)) != NULL)
4105 output_constant (TREE_VALUE (link), elt_size, nalign);
4115 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4116 output_constructor (exp, size, align);
4126 if (size > thissize)
4127 assemble_zeros (size - thissize);
4131 /* Subroutine of output_constructor, used for computing the size of
4132 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4133 type with an unspecified upper bound. */
4135 static unsigned HOST_WIDE_INT
4136 array_size_for_constructor (tree val)
4139 unsigned HOST_WIDE_INT cnt;
4140 tree index, value, tmp;
4142 /* This code used to attempt to handle string constants that are not
4143 arrays of single-bytes, but nothing else does, so there's no point in
4145 if (TREE_CODE (val) == STRING_CST)
4146 return TREE_STRING_LENGTH (val);
4148 max_index = NULL_TREE;
4149 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4151 if (TREE_CODE (index) == RANGE_EXPR)
4152 index = TREE_OPERAND (index, 1);
4153 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4157 if (max_index == NULL_TREE)
4160 /* Compute the total number of array elements. */
4161 tmp = TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)));
4162 i = size_binop (MINUS_EXPR, fold_convert (sizetype, max_index),
4163 fold_convert (sizetype, tmp));
4164 i = size_binop (PLUS_EXPR, i, build_int_cst (sizetype, 1));
4166 /* Multiply by the array element unit size to find number of bytes. */
4167 i = size_binop (MULT_EXPR, i, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4169 return tree_low_cst (i, 1);
4172 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4173 Generate at least SIZE bytes, padding if necessary. */
4176 output_constructor (tree exp, unsigned HOST_WIDE_INT size,
4179 tree type = TREE_TYPE (exp);
4182 /* Number of bytes output or skipped so far.
4183 In other words, current position within the constructor. */
4184 HOST_WIDE_INT total_bytes = 0;
4185 /* Nonzero means BYTE contains part of a byte, to be output. */
4186 int byte_buffer_in_use = 0;
4188 unsigned HOST_WIDE_INT cnt;
4189 constructor_elt *ce;
4191 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
4193 if (TREE_CODE (type) == RECORD_TYPE)
4194 field = TYPE_FIELDS (type);
4196 if (TREE_CODE (type) == ARRAY_TYPE
4197 && TYPE_DOMAIN (type) != 0)
4198 min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (type));
4200 /* As LINK goes through the elements of the constant,
4201 FIELD goes through the structure fields, if the constant is a structure.
4202 if the constant is a union, then we override this,
4203 by getting the field from the TREE_LIST element.
4204 But the constant could also be an array. Then FIELD is zero.
4206 There is always a maximum of one element in the chain LINK for unions
4207 (even if the initializer in a source program incorrectly contains
4210 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), cnt, ce);
4211 cnt++, field = field ? TREE_CHAIN (field) : 0)
4213 tree val = ce->value;
4216 /* The element in a union constructor specifies the proper field
4218 if ((TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
4219 || TREE_CODE (type) == QUAL_UNION_TYPE)
4223 else if (TREE_CODE (type) == ARRAY_TYPE)
4226 #ifdef ASM_COMMENT_START
4227 if (field && flag_verbose_asm)
4228 fprintf (asm_out_file, "%s %s:\n",
4231 ? IDENTIFIER_POINTER (DECL_NAME (field))
4235 /* Eliminate the marker that makes a cast not be an lvalue. */
4239 if (index && TREE_CODE (index) == RANGE_EXPR)
4241 unsigned HOST_WIDE_INT fieldsize
4242 = int_size_in_bytes (TREE_TYPE (type));
4243 HOST_WIDE_INT lo_index = tree_low_cst (TREE_OPERAND (index, 0), 0);
4244 HOST_WIDE_INT hi_index = tree_low_cst (TREE_OPERAND (index, 1), 0);
4245 HOST_WIDE_INT index;
4246 unsigned int align2 = min_align (align, fieldsize * BITS_PER_UNIT);
4248 for (index = lo_index; index <= hi_index; index++)
4250 /* Output the element's initial value. */
4252 assemble_zeros (fieldsize);
4254 output_constant (val, fieldsize, align2);
4256 /* Count its size. */
4257 total_bytes += fieldsize;
4260 else if (field == 0 || !DECL_BIT_FIELD (field))
4262 /* An element that is not a bit-field. */
4264 unsigned HOST_WIDE_INT fieldsize;
4265 /* Since this structure is static,
4266 we know the positions are constant. */
4267 HOST_WIDE_INT pos = field ? int_byte_position (field) : 0;
4268 unsigned int align2;
4271 pos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val)), 1)
4272 * (tree_low_cst (index, 0) - tree_low_cst (min_index, 0)));
4274 /* Output any buffered-up bit-fields preceding this element. */
4275 if (byte_buffer_in_use)
4277 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4279 byte_buffer_in_use = 0;
4282 /* Advance to offset of this element.
4283 Note no alignment needed in an array, since that is guaranteed
4284 if each element has the proper size. */
4285 if ((field != 0 || index != 0) && pos != total_bytes)
4287 gcc_assert (pos >= total_bytes);
4288 assemble_zeros (pos - total_bytes);
4292 /* Find the alignment of this element. */
4293 align2 = min_align (align, BITS_PER_UNIT * pos);
4295 /* Determine size this element should occupy. */
4300 /* If this is an array with an unspecified upper bound,
4301 the initializer determines the size. */
4302 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4303 but we cannot do this until the deprecated support for
4304 initializing zero-length array members is removed. */
4305 if (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE
4306 && TYPE_DOMAIN (TREE_TYPE (field))
4307 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field))))
4309 fieldsize = array_size_for_constructor (val);
4310 /* Given a non-empty initialization, this field had
4312 gcc_assert (!fieldsize || !TREE_CHAIN (field));
4314 else if (DECL_SIZE_UNIT (field))
4316 /* ??? This can't be right. If the decl size overflows
4317 a host integer we will silently emit no data. */
4318 if (host_integerp (DECL_SIZE_UNIT (field), 1))
4319 fieldsize = tree_low_cst (DECL_SIZE_UNIT (field), 1);
4323 fieldsize = int_size_in_bytes (TREE_TYPE (type));
4325 /* Output the element's initial value. */
4327 assemble_zeros (fieldsize);
4329 output_constant (val, fieldsize, align2);
4331 /* Count its size. */
4332 total_bytes += fieldsize;
4334 else if (val != 0 && TREE_CODE (val) != INTEGER_CST)
4335 error ("invalid initial value for member %qs",
4336 IDENTIFIER_POINTER (DECL_NAME (field)));
4339 /* Element that is a bit-field. */
4341 HOST_WIDE_INT next_offset = int_bit_position (field);
4342 HOST_WIDE_INT end_offset
4343 = (next_offset + tree_low_cst (DECL_SIZE (field), 1));
4346 val = integer_zero_node;
4348 /* If this field does not start in this (or, next) byte,
4350 if (next_offset / BITS_PER_UNIT != total_bytes)
4352 /* Output remnant of any bit field in previous bytes. */
4353 if (byte_buffer_in_use)
4355 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4357 byte_buffer_in_use = 0;
4360 /* If still not at proper byte, advance to there. */
4361 if (next_offset / BITS_PER_UNIT != total_bytes)
4363 gcc_assert (next_offset / BITS_PER_UNIT >= total_bytes);
4364 assemble_zeros (next_offset / BITS_PER_UNIT - total_bytes);
4365 total_bytes = next_offset / BITS_PER_UNIT;
4369 if (! byte_buffer_in_use)
4372 /* We must split the element into pieces that fall within
4373 separate bytes, and combine each byte with previous or
4374 following bit-fields. */
4376 /* next_offset is the offset n fbits from the beginning of
4377 the structure to the next bit of this element to be processed.
4378 end_offset is the offset of the first bit past the end of
4380 while (next_offset < end_offset)
4384 HOST_WIDE_INT value;
4385 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
4386 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
4388 /* Advance from byte to byte
4389 within this element when necessary. */
4390 while (next_byte != total_bytes)
4392 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4397 /* Number of bits we can process at once
4398 (all part of the same byte). */
4399 this_time = MIN (end_offset - next_offset,
4400 BITS_PER_UNIT - next_bit);
4401 if (BYTES_BIG_ENDIAN)
4403 /* On big-endian machine, take the most significant bits
4404 first (of the bits that are significant)
4405 and put them into bytes from the most significant end. */
4406 shift = end_offset - next_offset - this_time;
4408 /* Don't try to take a bunch of bits that cross
4409 the word boundary in the INTEGER_CST. We can
4410 only select bits from the LOW or HIGH part
4412 if (shift < HOST_BITS_PER_WIDE_INT
4413 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4415 this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
4416 shift = HOST_BITS_PER_WIDE_INT;
4419 /* Now get the bits from the appropriate constant word. */
4420 if (shift < HOST_BITS_PER_WIDE_INT)
4421 value = TREE_INT_CST_LOW (val);
4424 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4425 value = TREE_INT_CST_HIGH (val);
4426 shift -= HOST_BITS_PER_WIDE_INT;
4429 /* Get the result. This works only when:
4430 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4431 byte |= (((value >> shift)
4432 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4433 << (BITS_PER_UNIT - this_time - next_bit));
4437 /* On little-endian machines,
4438 take first the least significant bits of the value
4439 and pack them starting at the least significant
4440 bits of the bytes. */
4441 shift = next_offset - int_bit_position (field);
4443 /* Don't try to take a bunch of bits that cross
4444 the word boundary in the INTEGER_CST. We can
4445 only select bits from the LOW or HIGH part
4447 if (shift < HOST_BITS_PER_WIDE_INT
4448 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4449 this_time = (HOST_BITS_PER_WIDE_INT - shift);
4451 /* Now get the bits from the appropriate constant word. */
4452 if (shift < HOST_BITS_PER_WIDE_INT)
4453 value = TREE_INT_CST_LOW (val);
4456 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4457 value = TREE_INT_CST_HIGH (val);
4458 shift -= HOST_BITS_PER_WIDE_INT;
4461 /* Get the result. This works only when:
4462 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4463 byte |= (((value >> shift)
4464 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4468 next_offset += this_time;
4469 byte_buffer_in_use = 1;
4474 if (byte_buffer_in_use)
4476 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4480 if ((unsigned HOST_WIDE_INT)total_bytes < size)
4481 assemble_zeros (size - total_bytes);
4484 /* This TREE_LIST contains any weak symbol declarations waiting
4486 static GTY(()) tree weak_decls;
4488 /* Mark DECL as weak. */
4491 mark_weak (tree decl)
4493 DECL_WEAK (decl) = 1;
4495 if (DECL_RTL_SET_P (decl)
4496 && MEM_P (DECL_RTL (decl))
4497 && XEXP (DECL_RTL (decl), 0)
4498 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
4499 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
4502 /* Merge weak status between NEWDECL and OLDDECL. */
4505 merge_weak (tree newdecl, tree olddecl)
4507 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
4509 if (DECL_WEAK (newdecl) && SUPPORTS_WEAK)
4512 /* We put the NEWDECL on the weak_decls list at some point
4513 and OLDDECL as well. Keep just OLDDECL on the list. */
4514 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
4515 if (TREE_VALUE (*pwd) == newdecl)
4517 *pwd = TREE_CHAIN (*pwd);
4524 if (DECL_WEAK (newdecl))
4528 /* NEWDECL is weak, but OLDDECL is not. */
4530 /* If we already output the OLDDECL, we're in trouble; we can't
4531 go back and make it weak. This error cannot caught in
4532 declare_weak because the NEWDECL and OLDDECL was not yet
4533 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4534 if (TREE_ASM_WRITTEN (olddecl))
4535 error ("weak declaration of %q+D must precede definition",
4538 /* If we've already generated rtl referencing OLDDECL, we may
4539 have done so in a way that will not function properly with
4541 else if (TREE_USED (olddecl)
4542 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)))
4543 warning (0, "weak declaration of %q+D after first use results "
4544 "in unspecified behavior", newdecl);
4548 /* We put the NEWDECL on the weak_decls list at some point.
4549 Replace it with the OLDDECL. */
4550 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
4551 if (TREE_VALUE (wd) == newdecl)
4553 TREE_VALUE (wd) = olddecl;
4556 /* We may not find the entry on the list. If NEWDECL is a
4557 weak alias, then we will have already called
4558 globalize_decl to remove the entry; in that case, we do
4559 not need to do anything. */
4562 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4563 mark_weak (olddecl);
4566 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4567 weak. Just update NEWDECL to indicate that it's weak too. */
4568 mark_weak (newdecl);
4571 /* Declare DECL to be a weak symbol. */
4574 declare_weak (tree decl)
4576 if (! TREE_PUBLIC (decl))
4577 error ("weak declaration of %q+D must be public", decl);
4578 else if (TREE_CODE (decl) == FUNCTION_DECL && TREE_ASM_WRITTEN (decl))
4579 error ("weak declaration of %q+D must precede definition", decl);
4580 else if (SUPPORTS_WEAK)
4582 if (! DECL_WEAK (decl))
4583 weak_decls = tree_cons (NULL, decl, weak_decls);
4586 warning (0, "weak declaration of %q+D not supported", decl);
4592 weak_finish_1 (tree decl)
4594 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
4595 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4598 if (! TREE_USED (decl))
4601 #ifdef ASM_WEAKEN_DECL
4602 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
4604 #ifdef ASM_WEAKEN_LABEL
4605 ASM_WEAKEN_LABEL (asm_out_file, name);
4607 #ifdef ASM_OUTPUT_WEAK_ALIAS
4609 static bool warn_once = 0;
4612 warning (0, "only weak aliases are supported in this configuration");
4622 /* This TREE_LIST contains weakref targets. */
4624 static GTY(()) tree weakref_targets;
4626 /* Forward declaration. */
4627 static tree find_decl_and_mark_needed (tree decl, tree target);
4629 /* Emit any pending weak declarations. */
4636 for (t = weakref_targets; t; t = TREE_CHAIN (t))
4638 tree alias_decl = TREE_PURPOSE (t);
4639 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
4641 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
4642 /* Remove alias_decl from the weak list, but leave entries for
4643 the target alone. */
4645 #ifndef ASM_OUTPUT_WEAKREF
4646 else if (! TREE_SYMBOL_REFERENCED (target))
4648 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
4649 defined, otherwise we and weak_finish_1 would use a
4650 different macros. */
4651 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
4652 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
4654 tree decl = find_decl_and_mark_needed (alias_decl, target);
4658 decl = build_decl (TREE_CODE (alias_decl), target,
4659 TREE_TYPE (alias_decl));
4661 DECL_EXTERNAL (decl) = 1;
4662 TREE_PUBLIC (decl) = 1;
4663 DECL_ARTIFICIAL (decl) = 1;
4664 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
4665 TREE_USED (decl) = 1;
4668 weak_finish_1 (decl);
4677 /* Remove the alias and the target from the pending weak list
4678 so that we do not emit any .weak directives for the former,
4679 nor multiple .weak directives for the latter. */
4680 for (p = &weak_decls; (t2 = *p) ; )
4682 if (TREE_VALUE (t2) == alias_decl
4683 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
4684 *p = TREE_CHAIN (t2);
4686 p = &TREE_CHAIN (t2);
4689 /* Remove other weakrefs to the same target, to speed things up. */
4690 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
4692 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
4693 *p = TREE_CHAIN (t2);
4695 p = &TREE_CHAIN (t2);
4700 for (t = weak_decls; t; t = TREE_CHAIN (t))
4702 tree decl = TREE_VALUE (t);
4704 weak_finish_1 (decl);
4708 /* Emit the assembly bits to indicate that DECL is globally visible. */
4711 globalize_decl (tree decl)
4713 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
4715 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
4716 if (DECL_WEAK (decl))
4720 #ifdef ASM_WEAKEN_DECL
4721 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
4723 ASM_WEAKEN_LABEL (asm_out_file, name);
4726 /* Remove this function from the pending weak list so that
4727 we do not emit multiple .weak directives for it. */
4728 for (p = &weak_decls; (t = *p) ; )
4730 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
4731 *p = TREE_CHAIN (t);
4733 p = &TREE_CHAIN (t);
4736 /* Remove weakrefs to the same target from the pending weakref
4737 list, for the same reason. */
4738 for (p = &weakref_targets; (t = *p) ; )
4740 if (DECL_ASSEMBLER_NAME (decl)
4741 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
4742 *p = TREE_CHAIN (t);
4744 p = &TREE_CHAIN (t);
4749 #elif defined(ASM_MAKE_LABEL_LINKONCE)
4750 if (DECL_ONE_ONLY (decl))
4751 ASM_MAKE_LABEL_LINKONCE (asm_out_file, name);
4754 targetm.asm_out.globalize_label (asm_out_file, name);
4757 /* We have to be able to tell cgraph about the needed-ness of the target
4758 of an alias. This requires that the decl have been defined. Aliases
4759 that precede their definition have to be queued for later processing. */
4761 typedef struct alias_pair GTY(())
4767 /* Define gc'd vector type. */
4768 DEF_VEC_O(alias_pair);
4769 DEF_VEC_ALLOC_O(alias_pair,gc);
4771 static GTY(()) VEC(alias_pair,gc) *alias_pairs;
4773 /* Given an assembly name, find the decl it is associated with. At the
4774 same time, mark it needed for cgraph. */
4777 find_decl_and_mark_needed (tree decl, tree target)
4779 struct cgraph_node *fnode = NULL;
4780 struct cgraph_varpool_node *vnode = NULL;
4782 if (TREE_CODE (decl) == FUNCTION_DECL)
4784 fnode = cgraph_node_for_asm (target);
4786 vnode = cgraph_varpool_node_for_asm (target);
4790 vnode = cgraph_varpool_node_for_asm (target);
4792 fnode = cgraph_node_for_asm (target);
4797 /* We can't mark function nodes as used after cgraph global info
4798 is finished. This wouldn't generally be necessary, but C++
4799 virtual table thunks are introduced late in the game and
4800 might seem like they need marking, although in fact they
4802 if (! cgraph_global_info_ready)
4803 cgraph_mark_needed_node (fnode);
4808 cgraph_varpool_mark_needed_node (vnode);
4815 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
4816 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
4817 tree node is DECL to have the value of the tree node TARGET. */
4820 do_assemble_alias (tree decl, tree target)
4822 if (TREE_ASM_WRITTEN (decl))
4825 TREE_ASM_WRITTEN (decl) = 1;
4826 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
4828 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
4830 ultimate_transparent_alias_target (&target);
4832 if (!TREE_SYMBOL_REFERENCED (target))
4833 weakref_targets = tree_cons (decl, target, weakref_targets);
4835 #ifdef ASM_OUTPUT_WEAKREF
4836 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
4837 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
4838 IDENTIFIER_POINTER (target));
4842 error ("%Jweakref is not supported in this configuration", decl);
4849 #ifdef ASM_OUTPUT_DEF
4850 /* Make name accessible from other files, if appropriate. */
4852 if (TREE_PUBLIC (decl))
4854 globalize_decl (decl);
4855 maybe_assemble_visibility (decl);
4858 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
4859 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
4861 ASM_OUTPUT_DEF (asm_out_file,
4862 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
4863 IDENTIFIER_POINTER (target));
4865 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
4870 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4871 # ifdef ASM_WEAKEN_DECL
4872 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
4874 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
4876 /* Remove this function from the pending weak list so that
4877 we do not emit multiple .weak directives for it. */
4878 for (p = &weak_decls; (t = *p) ; )
4879 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
4880 *p = TREE_CHAIN (t);
4882 p = &TREE_CHAIN (t);
4884 /* Remove weakrefs to the same target from the pending weakref
4885 list, for the same reason. */
4886 for (p = &weakref_targets; (t = *p) ; )
4888 if (DECL_ASSEMBLER_NAME (decl)
4889 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
4890 *p = TREE_CHAIN (t);
4892 p = &TREE_CHAIN (t);
4898 /* First pass of completing pending aliases. Make sure that cgraph knows
4899 which symbols will be required. */
4902 finish_aliases_1 (void)
4907 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
4911 target_decl = find_decl_and_mark_needed (p->decl, p->target);
4912 if (target_decl == NULL)
4914 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
4915 error ("%q+D aliased to undefined symbol %qs",
4916 p->decl, IDENTIFIER_POINTER (p->target));
4918 else if (DECL_EXTERNAL (target_decl)
4919 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
4920 error ("%q+D aliased to external symbol %qs",
4921 p->decl, IDENTIFIER_POINTER (p->target));
4925 /* Second pass of completing pending aliases. Emit the actual assembly.
4926 This happens at the end of compilation and thus it is assured that the
4927 target symbol has been emitted. */
4930 finish_aliases_2 (void)
4935 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
4936 do_assemble_alias (p->decl, p->target);
4938 VEC_truncate (alias_pair, alias_pairs, 0);
4941 /* Emit an assembler directive to make the symbol for DECL an alias to
4942 the symbol for TARGET. */
4945 assemble_alias (tree decl, tree target)
4948 bool is_weakref = false;
4950 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
4952 tree alias = DECL_ASSEMBLER_NAME (decl);
4956 ultimate_transparent_alias_target (&target);
4958 if (alias == target)
4959 error ("weakref %q+D ultimately targets itself", decl);
4962 #ifndef ASM_OUTPUT_WEAKREF
4963 IDENTIFIER_TRANSPARENT_ALIAS (alias) = 1;
4964 TREE_CHAIN (alias) = target;
4967 if (TREE_PUBLIC (decl))
4968 error ("weakref %q+D must have static linkage", decl);
4972 #if !defined (ASM_OUTPUT_DEF)
4973 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
4974 error ("%Jalias definitions not supported in this configuration", decl);
4977 if (!DECL_WEAK (decl))
4979 error ("%Jonly weak aliases are supported in this configuration", decl);
4986 /* We must force creation of DECL_RTL for debug info generation, even though
4987 we don't use it here. */
4988 make_decl_rtl (decl);
4989 TREE_USED (decl) = 1;
4991 /* A quirk of the initial implementation of aliases required that the user
4992 add "extern" to all of them. Which is silly, but now historical. Do
4993 note that the symbol is in fact locally defined. */
4995 DECL_EXTERNAL (decl) = 0;
4997 /* Allow aliases to aliases. */
4998 if (TREE_CODE (decl) == FUNCTION_DECL)
4999 cgraph_node (decl)->alias = true;
5001 cgraph_varpool_node (decl)->alias = true;
5003 /* If the target has already been emitted, we don't have to queue the
5004 alias. This saves a tad o memory. */
5005 target_decl = find_decl_and_mark_needed (decl, target);
5006 if (target_decl && TREE_ASM_WRITTEN (target_decl))
5007 do_assemble_alias (decl, target);
5010 alias_pair *p = VEC_safe_push (alias_pair, gc, alias_pairs, NULL);
5016 /* Emit an assembler directive to set symbol for DECL visibility to
5017 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5020 default_assemble_visibility (tree decl, int vis)
5022 static const char * const visibility_types[] = {
5023 NULL, "internal", "hidden", "protected"
5026 const char *name, *type;
5028 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5029 type = visibility_types[vis];
5031 #ifdef HAVE_GAS_HIDDEN
5032 fprintf (asm_out_file, "\t.%s\t", type);
5033 assemble_name (asm_out_file, name);
5034 fprintf (asm_out_file, "\n");
5036 warning (OPT_Wattributes, "visibility attribute not supported "
5037 "in this configuration; ignored");
5041 /* A helper function to call assemble_visibility when needed for a decl. */
5044 maybe_assemble_visibility (tree decl)
5046 enum symbol_visibility vis = DECL_VISIBILITY (decl);
5048 if (vis != VISIBILITY_DEFAULT)
5049 targetm.asm_out.visibility (decl, vis);
5052 /* Returns 1 if the target configuration supports defining public symbols
5053 so that one of them will be chosen at link time instead of generating a
5054 multiply-defined symbol error, whether through the use of weak symbols or
5055 a target-specific mechanism for having duplicates discarded. */
5058 supports_one_only (void)
5060 if (SUPPORTS_ONE_ONLY)
5062 return SUPPORTS_WEAK;
5065 /* Set up DECL as a public symbol that can be defined in multiple
5066 translation units without generating a linker error. */
5069 make_decl_one_only (tree decl)
5071 gcc_assert (TREE_CODE (decl) == VAR_DECL
5072 || TREE_CODE (decl) == FUNCTION_DECL);
5074 TREE_PUBLIC (decl) = 1;
5076 if (SUPPORTS_ONE_ONLY)
5078 #ifdef MAKE_DECL_ONE_ONLY
5079 MAKE_DECL_ONE_ONLY (decl);
5081 DECL_ONE_ONLY (decl) = 1;
5083 else if (TREE_CODE (decl) == VAR_DECL
5084 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
5085 DECL_COMMON (decl) = 1;
5088 gcc_assert (SUPPORTS_WEAK);
5089 DECL_WEAK (decl) = 1;
5094 init_varasm_once (void)
5096 section_htab = htab_create_ggc (31, section_entry_hash,
5097 section_entry_eq, NULL);
5098 object_block_htab = htab_create_ggc (31, object_block_entry_hash,
5099 object_block_entry_eq, NULL);
5100 const_desc_htab = htab_create_ggc (1009, const_desc_hash,
5101 const_desc_eq, NULL);
5103 const_alias_set = new_alias_set ();
5104 shared_constant_pool = create_constant_pool ();
5106 #ifdef TEXT_SECTION_ASM_OP
5107 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
5108 TEXT_SECTION_ASM_OP);
5111 #ifdef DATA_SECTION_ASM_OP
5112 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5113 DATA_SECTION_ASM_OP);
5116 #ifdef SDATA_SECTION_ASM_OP
5117 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5118 SDATA_SECTION_ASM_OP);
5121 #ifdef READONLY_DATA_SECTION_ASM_OP
5122 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
5123 READONLY_DATA_SECTION_ASM_OP);
5126 #ifdef CTORS_SECTION_ASM_OP
5127 ctors_section = get_unnamed_section (0, output_section_asm_op,
5128 CTORS_SECTION_ASM_OP);
5131 #ifdef DTORS_SECTION_ASM_OP
5132 dtors_section = get_unnamed_section (0, output_section_asm_op,
5133 DTORS_SECTION_ASM_OP);
5136 #ifdef BSS_SECTION_ASM_OP
5137 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5138 output_section_asm_op,
5139 BSS_SECTION_ASM_OP);
5142 #ifdef SBSS_SECTION_ASM_OP
5143 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5144 output_section_asm_op,
5145 SBSS_SECTION_ASM_OP);
5148 tls_comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5149 | SECTION_COMMON, emit_tls_common);
5150 lcomm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5151 | SECTION_COMMON, emit_local);
5152 comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5153 | SECTION_COMMON, emit_common);
5155 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5156 bss_noswitch_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS,
5160 targetm.asm_out.init_sections ();
5162 if (readonly_data_section == NULL)
5163 readonly_data_section = text_section;
5167 decl_default_tls_model (tree decl)
5169 enum tls_model kind;
5172 is_local = targetm.binds_local_p (decl);
5176 kind = TLS_MODEL_LOCAL_EXEC;
5178 kind = TLS_MODEL_INITIAL_EXEC;
5181 /* Local dynamic is inefficient when we're not combining the
5182 parts of the address. */
5183 else if (optimize && is_local)
5184 kind = TLS_MODEL_LOCAL_DYNAMIC;
5186 kind = TLS_MODEL_GLOBAL_DYNAMIC;
5187 if (kind < flag_tls_default)
5188 kind = flag_tls_default;
5193 /* Select a set of attributes for section NAME based on the properties
5194 of DECL and whether or not RELOC indicates that DECL's initializer
5195 might contain runtime relocations.
5197 We make the section read-only and executable for a function decl,
5198 read-only for a const data decl, and writable for a non-const data decl. */
5201 default_section_type_flags (tree decl, const char *name, int reloc)
5203 return default_section_type_flags_1 (decl, name, reloc, flag_pic);
5207 default_section_type_flags_1 (tree decl, const char *name, int reloc,
5212 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
5213 flags = SECTION_CODE;
5214 else if (decl && decl_readonly_section_1 (decl, reloc, shlib))
5216 else if (current_function_decl
5218 && cfun->unlikely_text_section_name
5219 && strcmp (name, cfun->unlikely_text_section_name) == 0)
5220 flags = SECTION_CODE;
5222 && (!current_function_decl || !cfun)
5223 && strcmp (name, UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
5224 flags = SECTION_CODE;
5226 flags = SECTION_WRITE;
5228 if (decl && DECL_ONE_ONLY (decl))
5229 flags |= SECTION_LINKONCE;
5231 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5232 flags |= SECTION_TLS | SECTION_WRITE;
5234 if (strcmp (name, ".bss") == 0
5235 || strncmp (name, ".bss.", 5) == 0
5236 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
5237 || strcmp (name, ".sbss") == 0
5238 || strncmp (name, ".sbss.", 6) == 0
5239 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
5240 flags |= SECTION_BSS;
5242 if (strcmp (name, ".tdata") == 0
5243 || strncmp (name, ".tdata.", 7) == 0
5244 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
5245 flags |= SECTION_TLS;
5247 if (strcmp (name, ".tbss") == 0
5248 || strncmp (name, ".tbss.", 6) == 0
5249 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
5250 flags |= SECTION_TLS | SECTION_BSS;
5252 /* These three sections have special ELF types. They are neither
5253 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5254 want to print a section type (@progbits or @nobits). If someone
5255 is silly enough to emit code or TLS variables to one of these
5256 sections, then don't handle them specially. */
5257 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
5258 && (strcmp (name, ".init_array") == 0
5259 || strcmp (name, ".fini_array") == 0
5260 || strcmp (name, ".preinit_array") == 0))
5261 flags |= SECTION_NOTYPE;
5266 /* Return true if the target supports some form of global BSS,
5267 either through bss_noswitch_section, or by selecting a BSS
5268 section in TARGET_ASM_SELECT_SECTION. */
5271 have_global_bss_p (void)
5273 return bss_noswitch_section || targetm.have_switchable_bss_sections;
5276 /* Output assembly to switch to section NAME with attribute FLAGS.
5277 Four variants for common object file formats. */
5280 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
5281 unsigned int flags ATTRIBUTE_UNUSED,
5282 tree decl ATTRIBUTE_UNUSED)
5284 /* Some object formats don't support named sections at all. The
5285 front-end should already have flagged this as an error. */
5290 default_elf_asm_named_section (const char *name, unsigned int flags,
5291 tree decl ATTRIBUTE_UNUSED)
5293 char flagchars[10], *f = flagchars;
5295 /* If we have already declared this section, we can use an
5296 abbreviated form to switch back to it -- unless this section is
5297 part of a COMDAT groups, in which case GAS requires the full
5298 declaration every time. */
5299 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5300 && (flags & SECTION_DECLARED))
5302 fprintf (asm_out_file, "\t.section\t%s\n", name);
5306 if (!(flags & SECTION_DEBUG))
5308 if (flags & SECTION_WRITE)
5310 if (flags & SECTION_CODE)
5312 if (flags & SECTION_SMALL)
5314 if (flags & SECTION_MERGE)
5316 if (flags & SECTION_STRINGS)
5318 if (flags & SECTION_TLS)
5320 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5324 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
5326 if (!(flags & SECTION_NOTYPE))
5331 if (flags & SECTION_BSS)
5337 #ifdef ASM_COMMENT_START
5338 /* On platforms that use "@" as the assembly comment character,
5340 if (strcmp (ASM_COMMENT_START, "@") == 0)
5343 fprintf (asm_out_file, format, type);
5345 if (flags & SECTION_ENTSIZE)
5346 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
5347 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5348 fprintf (asm_out_file, ",%s,comdat",
5349 lang_hooks.decls.comdat_group (decl));
5352 putc ('\n', asm_out_file);
5356 default_coff_asm_named_section (const char *name, unsigned int flags,
5357 tree decl ATTRIBUTE_UNUSED)
5359 char flagchars[8], *f = flagchars;
5361 if (flags & SECTION_WRITE)
5363 if (flags & SECTION_CODE)
5367 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
5371 default_pe_asm_named_section (const char *name, unsigned int flags,
5374 default_coff_asm_named_section (name, flags, decl);
5376 if (flags & SECTION_LINKONCE)
5378 /* Functions may have been compiled at various levels of
5379 optimization so we can't use `same_size' here.
5380 Instead, have the linker pick one. */
5381 fprintf (asm_out_file, "\t.linkonce %s\n",
5382 (flags & SECTION_CODE ? "discard" : "same_size"));
5386 /* The lame default section selector. */
5389 default_select_section (tree decl, int reloc,
5390 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
5394 if (decl_readonly_section (decl, reloc))
5395 return readonly_data_section;
5397 else if (TREE_CODE (decl) == CONSTRUCTOR)
5399 if (! ((flag_pic && reloc)
5400 || !TREE_READONLY (decl)
5401 || TREE_SIDE_EFFECTS (decl)
5402 || !TREE_CONSTANT (decl)))
5403 return readonly_data_section;
5405 else if (TREE_CODE (decl) == STRING_CST)
5406 return readonly_data_section;
5407 else if (! (flag_pic && reloc))
5408 return readonly_data_section;
5410 return data_section;
5413 enum section_category
5414 categorize_decl_for_section (tree decl, int reloc, int shlib)
5416 enum section_category ret;
5418 if (TREE_CODE (decl) == FUNCTION_DECL)
5420 else if (TREE_CODE (decl) == STRING_CST)
5422 if (flag_mudflap) /* or !flag_merge_constants */
5423 return SECCAT_RODATA;
5425 return SECCAT_RODATA_MERGE_STR;
5427 else if (TREE_CODE (decl) == VAR_DECL)
5429 if (bss_initializer_p (decl))
5431 else if (! TREE_READONLY (decl)
5432 || TREE_SIDE_EFFECTS (decl)
5433 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
5435 if (shlib && (reloc & 2))
5436 ret = SECCAT_DATA_REL;
5437 else if (shlib && reloc)
5438 ret = SECCAT_DATA_REL_LOCAL;
5442 else if (shlib && (reloc & 2))
5443 ret = SECCAT_DATA_REL_RO;
5444 else if (shlib && reloc)
5445 ret = SECCAT_DATA_REL_RO_LOCAL;
5446 else if (reloc || flag_merge_constants < 2)
5447 /* C and C++ don't allow different variables to share the same
5448 location. -fmerge-all-constants allows even that (at the
5449 expense of not conforming). */
5450 ret = SECCAT_RODATA;
5451 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
5452 ret = SECCAT_RODATA_MERGE_STR_INIT;
5454 ret = SECCAT_RODATA_MERGE_CONST;
5456 else if (TREE_CODE (decl) == CONSTRUCTOR)
5458 if ((shlib && reloc)
5459 || TREE_SIDE_EFFECTS (decl)
5460 || ! TREE_CONSTANT (decl))
5463 ret = SECCAT_RODATA;
5466 ret = SECCAT_RODATA;
5468 /* There are no read-only thread-local sections. */
5469 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5471 /* Note that this would be *just* SECCAT_BSS, except that there's
5472 no concept of a read-only thread-local-data section. */
5473 if (ret == SECCAT_BSS
5474 || (flag_zero_initialized_in_bss
5475 && initializer_zerop (DECL_INITIAL (decl))))
5481 /* If the target uses small data sections, select it. */
5482 else if (targetm.in_small_data_p (decl))
5484 if (ret == SECCAT_BSS)
5486 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
5487 ret = SECCAT_SRODATA;
5496 decl_readonly_section (tree decl, int reloc)
5498 return decl_readonly_section_1 (decl, reloc, flag_pic);
5502 decl_readonly_section_1 (tree decl, int reloc, int shlib)
5504 switch (categorize_decl_for_section (decl, reloc, shlib))
5507 case SECCAT_RODATA_MERGE_STR:
5508 case SECCAT_RODATA_MERGE_STR_INIT:
5509 case SECCAT_RODATA_MERGE_CONST:
5510 case SECCAT_SRODATA:
5519 /* Select a section based on the above categorization. */
5522 default_elf_select_section (tree decl, int reloc,
5523 unsigned HOST_WIDE_INT align)
5525 return default_elf_select_section_1 (decl, reloc, align, flag_pic);
5529 default_elf_select_section_1 (tree decl, int reloc,
5530 unsigned HOST_WIDE_INT align, int shlib)
5533 switch (categorize_decl_for_section (decl, reloc, shlib))
5536 /* We're not supposed to be called on FUNCTION_DECLs. */
5539 return readonly_data_section;
5540 case SECCAT_RODATA_MERGE_STR:
5541 return mergeable_string_section (decl, align, 0);
5542 case SECCAT_RODATA_MERGE_STR_INIT:
5543 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
5544 case SECCAT_RODATA_MERGE_CONST:
5545 return mergeable_constant_section (DECL_MODE (decl), align, 0);
5546 case SECCAT_SRODATA:
5550 return data_section;
5551 case SECCAT_DATA_REL:
5552 sname = ".data.rel";
5554 case SECCAT_DATA_REL_LOCAL:
5555 sname = ".data.rel.local";
5557 case SECCAT_DATA_REL_RO:
5558 sname = ".data.rel.ro";
5560 case SECCAT_DATA_REL_RO_LOCAL:
5561 sname = ".data.rel.ro.local";
5586 return get_named_section (decl, sname, reloc);
5589 /* Construct a unique section name based on the decl name and the
5590 categorization performed above. */
5593 default_unique_section (tree decl, int reloc)
5595 default_unique_section_1 (decl, reloc, flag_pic);
5599 default_unique_section_1 (tree decl, int reloc, int shlib)
5601 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
5602 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
5603 const char *prefix, *name;
5607 switch (categorize_decl_for_section (decl, reloc, shlib))
5610 prefix = one_only ? ".gnu.linkonce.t." : ".text.";
5613 case SECCAT_RODATA_MERGE_STR:
5614 case SECCAT_RODATA_MERGE_STR_INIT:
5615 case SECCAT_RODATA_MERGE_CONST:
5616 prefix = one_only ? ".gnu.linkonce.r." : ".rodata.";
5618 case SECCAT_SRODATA:
5619 prefix = one_only ? ".gnu.linkonce.s2." : ".sdata2.";
5622 prefix = one_only ? ".gnu.linkonce.d." : ".data.";
5624 case SECCAT_DATA_REL:
5625 prefix = one_only ? ".gnu.linkonce.d.rel." : ".data.rel.";
5627 case SECCAT_DATA_REL_LOCAL:
5628 prefix = one_only ? ".gnu.linkonce.d.rel.local." : ".data.rel.local.";
5630 case SECCAT_DATA_REL_RO:
5631 prefix = one_only ? ".gnu.linkonce.d.rel.ro." : ".data.rel.ro.";
5633 case SECCAT_DATA_REL_RO_LOCAL:
5634 prefix = one_only ? ".gnu.linkonce.d.rel.ro.local."
5635 : ".data.rel.ro.local.";
5638 prefix = one_only ? ".gnu.linkonce.s." : ".sdata.";
5641 prefix = one_only ? ".gnu.linkonce.b." : ".bss.";
5644 prefix = one_only ? ".gnu.linkonce.sb." : ".sbss.";
5647 prefix = one_only ? ".gnu.linkonce.td." : ".tdata.";
5650 prefix = one_only ? ".gnu.linkonce.tb." : ".tbss.";
5655 plen = strlen (prefix);
5657 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5658 name = targetm.strip_name_encoding (name);
5659 nlen = strlen (name);
5661 string = alloca (nlen + plen + 1);
5662 memcpy (string, prefix, plen);
5663 memcpy (string + plen, name, nlen + 1);
5665 DECL_SECTION_NAME (decl) = build_string (nlen + plen, string);
5669 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED,
5671 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
5674 switch (GET_CODE (x))
5679 return data_section;
5685 return readonly_data_section;
5689 default_elf_select_rtx_section (enum machine_mode mode, rtx x,
5690 unsigned HOST_WIDE_INT align)
5692 /* ??? Handle small data here somehow. */
5695 switch (GET_CODE (x))
5699 return get_named_section (NULL, ".data.rel.ro", 3);
5702 return get_named_section (NULL, ".data.rel.ro.local", 1);
5708 return mergeable_constant_section (mode, align, 0);
5711 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
5714 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
5719 /* Careful not to prod global register variables. */
5722 symbol = XEXP (rtl, 0);
5723 if (GET_CODE (symbol) != SYMBOL_REF)
5726 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_HAS_BLOCK_INFO;
5727 if (TREE_CODE (decl) == FUNCTION_DECL)
5728 flags |= SYMBOL_FLAG_FUNCTION;
5729 if (targetm.binds_local_p (decl))
5730 flags |= SYMBOL_FLAG_LOCAL;
5731 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5732 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
5733 else if (targetm.in_small_data_p (decl))
5734 flags |= SYMBOL_FLAG_SMALL;
5735 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
5736 being PUBLIC, the thing *must* be defined in this translation unit.
5737 Prevent this buglet from being propagated into rtl code as well. */
5738 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
5739 flags |= SYMBOL_FLAG_EXTERNAL;
5741 SYMBOL_REF_FLAGS (symbol) = flags;
5744 /* By default, we do nothing for encode_section_info, so we need not
5745 do anything but discard the '*' marker. */
5748 default_strip_name_encoding (const char *str)
5750 return str + (*str == '*');
5753 #ifdef ASM_OUTPUT_DEF
5754 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
5755 anchor relative to ".", the current section position. */
5758 default_asm_output_anchor (rtx symbol)
5762 sprintf (buffer, ". + " HOST_WIDE_INT_PRINT_DEC,
5763 SYMBOL_REF_BLOCK_OFFSET (symbol));
5764 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
5768 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
5771 default_use_anchors_for_symbol_p (rtx symbol)
5776 /* Don't use anchors for mergeable sections. The linker might move
5777 the objects around. */
5778 sect = SYMBOL_REF_BLOCK (symbol)->sect;
5779 if (sect->common.flags & SECTION_MERGE)
5782 /* Don't use anchors for small data sections. The small data register
5783 acts as an anchor for such sections. */
5784 if (sect->common.flags & SECTION_SMALL)
5787 decl = SYMBOL_REF_DECL (symbol);
5788 if (decl && DECL_P (decl))
5790 /* Don't use section anchors for decls that might be defined by
5792 if (!targetm.binds_local_p (decl))
5795 /* Don't use section anchors for decls that will be placed in a
5796 small data section. */
5797 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
5798 one above. The problem is that we only use SECTION_SMALL for
5799 sections that should be marked as small in the section directive. */
5800 if (targetm.in_small_data_p (decl))
5806 /* Assume ELF-ish defaults, since that's pretty much the most liberal
5807 wrt cross-module name binding. */
5810 default_binds_local_p (tree exp)
5812 return default_binds_local_p_1 (exp, flag_shlib);
5816 default_binds_local_p_1 (tree exp, int shlib)
5820 /* A non-decl is an entry in the constant pool. */
5823 /* Weakrefs may not bind locally, even though the weakref itself is
5824 always static and therefore local. */
5825 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp)))
5827 /* Static variables are always local. */
5828 else if (! TREE_PUBLIC (exp))
5830 /* A variable is local if the user has said explicitly that it will
5832 else if (DECL_VISIBILITY_SPECIFIED (exp)
5833 && DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
5835 /* Variables defined outside this object might not be local. */
5836 else if (DECL_EXTERNAL (exp))
5838 /* If defined in this object and visibility is not default, must be
5840 else if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
5842 /* Default visibility weak data can be overridden by a strong symbol
5843 in another module and so are not local. */
5844 else if (DECL_WEAK (exp))
5846 /* If PIC, then assume that any global name can be overridden by
5847 symbols resolved from other modules. */
5850 /* Uninitialized COMMON variable may be unified with symbols
5851 resolved from other modules. */
5852 else if (DECL_COMMON (exp)
5853 && (DECL_INITIAL (exp) == NULL
5854 || DECL_INITIAL (exp) == error_mark_node))
5856 /* Otherwise we're left with initialized (or non-common) global data
5857 which is of necessity defined locally. */
5864 /* Determine whether or not a pointer mode is valid. Assume defaults
5865 of ptr_mode or Pmode - can be overridden. */
5867 default_valid_pointer_mode (enum machine_mode mode)
5869 return (mode == ptr_mode || mode == Pmode);
5872 /* Default function to output code that will globalize a label. A
5873 target must define GLOBAL_ASM_OP or provide its own function to
5874 globalize a label. */
5875 #ifdef GLOBAL_ASM_OP
5877 default_globalize_label (FILE * stream, const char *name)
5879 fputs (GLOBAL_ASM_OP, stream);
5880 assemble_name (stream, name);
5881 putc ('\n', stream);
5883 #endif /* GLOBAL_ASM_OP */
5885 /* Default function to output a label for unwind information. The
5886 default is to do nothing. A target that needs nonlocal labels for
5887 unwind information must provide its own function to do this. */
5889 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
5890 tree decl ATTRIBUTE_UNUSED,
5891 int for_eh ATTRIBUTE_UNUSED,
5892 int empty ATTRIBUTE_UNUSED)
5896 /* Default function to output a label to divide up the exception table.
5897 The default is to do nothing. A target that needs/wants to divide
5898 up the table must provide it's own function to do this. */
5900 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
5904 /* This is how to output an internal numbered label where PREFIX is
5905 the class of label and LABELNO is the number within the class. */
5908 default_internal_label (FILE *stream, const char *prefix,
5909 unsigned long labelno)
5911 char *const buf = alloca (40 + strlen (prefix));
5912 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
5913 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
5916 /* This is the default behavior at the beginning of a file. It's
5917 controlled by two other target-hook toggles. */
5919 default_file_start (void)
5921 if (targetm.file_start_app_off && !flag_verbose_asm)
5922 fputs (ASM_APP_OFF, asm_out_file);
5924 if (targetm.file_start_file_directive)
5925 output_file_directive (asm_out_file, main_input_filename);
5928 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
5929 which emits a special section directive used to indicate whether or
5930 not this object file needs an executable stack. This is primarily
5931 a GNU extension to ELF but could be used on other targets. */
5933 int trampolines_created;
5936 file_end_indicate_exec_stack (void)
5938 unsigned int flags = SECTION_DEBUG;
5939 if (trampolines_created)
5940 flags |= SECTION_CODE;
5942 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
5945 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
5946 a get_unnamed_section callback. */
5949 output_section_asm_op (const void *directive)
5951 fprintf (asm_out_file, "%s\n", (const char *) directive);
5954 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
5955 the current section is NEW_SECTION. */
5958 switch_to_section (section *new_section)
5960 if (in_section == new_section)
5963 if (new_section->common.flags & SECTION_FORGET)
5966 in_section = new_section;
5968 switch (SECTION_STYLE (new_section))
5972 && !cfun->unlikely_text_section_name
5973 && strcmp (new_section->named.name,
5974 UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
5975 cfun->unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
5977 targetm.asm_out.named_section (new_section->named.name,
5978 new_section->named.common.flags,
5979 new_section->named.decl);
5982 case SECTION_UNNAMED:
5983 new_section->unnamed.callback (new_section->unnamed.data);
5986 case SECTION_NOSWITCH:
5991 new_section->common.flags |= SECTION_DECLARED;
5994 /* If block symbol SYMBOL has not yet been assigned an offset, place
5995 it at the end of its block. */
5998 place_block_symbol (rtx symbol)
6000 unsigned HOST_WIDE_INT size, mask, offset;
6001 struct constant_descriptor_rtx *desc;
6002 unsigned int alignment;
6003 struct object_block *block;
6006 gcc_assert (SYMBOL_REF_BLOCK (symbol));
6007 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
6010 /* Work out the symbol's size and alignment. */
6011 if (CONSTANT_POOL_ADDRESS_P (symbol))
6013 desc = SYMBOL_REF_CONSTANT (symbol);
6014 alignment = desc->align;
6015 size = GET_MODE_SIZE (desc->mode);
6017 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6019 decl = SYMBOL_REF_DECL (symbol);
6020 alignment = get_constant_alignment (decl);
6021 size = get_constant_size (decl);
6025 decl = SYMBOL_REF_DECL (symbol);
6026 alignment = DECL_ALIGN (decl);
6027 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6030 /* Calculate the object's offset from the start of the block. */
6031 block = SYMBOL_REF_BLOCK (symbol);
6032 mask = alignment / BITS_PER_UNIT - 1;
6033 offset = (block->size + mask) & ~mask;
6034 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
6036 /* Record the block's new alignment and size. */
6037 block->alignment = MAX (block->alignment, alignment);
6038 block->size = offset + size;
6040 VEC_safe_push (rtx, gc, block->objects, symbol);
6043 /* Return the anchor that should be used to address byte offset OFFSET
6044 from the first object in BLOCK. MODEL is the TLS model used
6048 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
6049 enum tls_model model)
6052 unsigned int begin, middle, end;
6053 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
6056 /* Work out the anchor's offset. Use an offset of 0 for the first
6057 anchor so that we don't pessimize the case where we take the address
6058 of a variable at the beginning of the block. This is particularly
6059 useful when a block has only one variable assigned to it.
6061 We try to place anchors RANGE bytes apart, so there can then be
6062 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6063 a ptr_mode offset. With some target settings, the lowest such
6064 anchor might be out of range for the lowest ptr_mode offset;
6065 likewise the highest anchor for the highest offset. Use anchors
6066 at the extreme ends of the ptr_mode range in such cases.
6068 All arithmetic uses unsigned integers in order to avoid
6070 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
6071 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
6072 range = max_offset - min_offset + 1;
6077 bias = 1 << (GET_MODE_BITSIZE (ptr_mode) - 1);
6080 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
6081 delta -= delta % range;
6084 offset = (HOST_WIDE_INT) (-delta);
6088 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
6089 delta -= delta % range;
6090 if (delta > bias - 1)
6092 offset = (HOST_WIDE_INT) delta;
6096 /* Do a binary search to see if there's already an anchor we can use.
6097 Set BEGIN to the new anchor's index if not. */
6099 end = VEC_length (rtx, block->anchors);
6100 while (begin != end)
6102 middle = (end + begin) / 2;
6103 anchor = VEC_index (rtx, block->anchors, middle);
6104 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
6106 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
6108 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
6110 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
6116 /* Create a new anchor with a unique label. */
6117 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
6118 anchor = create_block_symbol (ggc_strdup (label), block, offset);
6119 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
6120 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
6122 /* Insert it at index BEGIN. */
6123 VEC_safe_insert (rtx, gc, block->anchors, begin, anchor);
6127 /* Output the objects in BLOCK. */
6130 output_object_block (struct object_block *block)
6132 struct constant_descriptor_rtx *desc;
6134 HOST_WIDE_INT offset;
6138 if (block->objects == NULL)
6141 /* Switch to the section and make sure that the first byte is
6142 suitably aligned. */
6143 switch_to_section (block->sect);
6144 assemble_align (block->alignment);
6146 /* Define the values of all anchors relative to the current section
6148 for (i = 0; VEC_iterate (rtx, block->anchors, i, symbol); i++)
6149 targetm.asm_out.output_anchor (symbol);
6151 /* Output the objects themselves. */
6153 for (i = 0; VEC_iterate (rtx, block->objects, i, symbol); i++)
6155 /* Move to the object's offset, padding with zeros if necessary. */
6156 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
6157 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
6158 if (CONSTANT_POOL_ADDRESS_P (symbol))
6160 desc = SYMBOL_REF_CONSTANT (symbol);
6161 output_constant_pool_1 (desc, 1);
6162 offset += GET_MODE_SIZE (desc->mode);
6164 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6166 decl = SYMBOL_REF_DECL (symbol);
6167 assemble_constant_contents (decl, XSTR (symbol, 0),
6168 get_constant_alignment (decl));
6169 offset += get_constant_size (decl);
6173 decl = SYMBOL_REF_DECL (symbol);
6174 assemble_variable_contents (decl, XSTR (symbol, 0), false);
6175 offset += tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6180 /* A htab_traverse callback used to call output_object_block for
6181 each member of object_block_htab. */
6184 output_object_block_htab (void **slot, void *data ATTRIBUTE_UNUSED)
6186 output_object_block ((struct object_block *) (*slot));
6190 /* Output the definitions of all object_blocks. */
6193 output_object_blocks (void)
6195 htab_traverse (object_block_htab, output_object_block_htab, NULL);
6198 #include "gt-varasm.h"