1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
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)
660 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
661 && TREE_CODE (decl) == STRING_CST
662 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
664 && (len = int_size_in_bytes (TREE_TYPE (decl))) > 0
665 && TREE_STRING_LENGTH (decl) >= len)
667 enum machine_mode mode;
668 unsigned int modesize;
674 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (decl)));
675 modesize = GET_MODE_BITSIZE (mode);
676 if (modesize >= 8 && modesize <= 256
677 && (modesize & (modesize - 1)) == 0)
679 if (align < modesize)
682 str = TREE_STRING_POINTER (decl);
683 unit = GET_MODE_SIZE (mode);
685 /* Check for embedded NUL characters. */
686 for (i = 0; i < len; i += unit)
688 for (j = 0; j < unit; j++)
689 if (str[i + j] != '\0')
696 sprintf (name, ".rodata.str%d.%d", modesize / 8,
698 flags |= (modesize / 8) | SECTION_MERGE | SECTION_STRINGS;
699 return get_section (name, flags, NULL);
704 return readonly_data_section;
707 /* Return the section to use for constant merging. */
710 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED,
711 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
712 unsigned int flags ATTRIBUTE_UNUSED)
714 unsigned int modesize = GET_MODE_BITSIZE (mode);
716 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
722 && (align & (align - 1)) == 0)
726 sprintf (name, ".rodata.cst%d", (int) (align / 8));
727 flags |= (align / 8) | SECTION_MERGE;
728 return get_section (name, flags, NULL);
730 return readonly_data_section;
733 /* Given NAME, a putative register name, discard any customary prefixes. */
736 strip_reg_name (const char *name)
738 #ifdef REGISTER_PREFIX
739 if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
740 name += strlen (REGISTER_PREFIX);
742 if (name[0] == '%' || name[0] == '#')
747 /* The user has asked for a DECL to have a particular name. Set (or
748 change) it in such a way that we don't prefix an underscore to
751 set_user_assembler_name (tree decl, const char *name)
753 char *starred = alloca (strlen (name) + 2);
755 strcpy (starred + 1, name);
756 change_decl_assembler_name (decl, get_identifier (starred));
757 SET_DECL_RTL (decl, NULL_RTX);
760 /* Decode an `asm' spec for a declaration as a register name.
761 Return the register number, or -1 if nothing specified,
762 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
763 or -3 if ASMSPEC is `cc' and is not recognized,
764 or -4 if ASMSPEC is `memory' and is not recognized.
765 Accept an exact spelling or a decimal number.
766 Prefixes such as % are optional. */
769 decode_reg_name (const char *asmspec)
775 /* Get rid of confusing prefixes. */
776 asmspec = strip_reg_name (asmspec);
778 /* Allow a decimal number as a "register name". */
779 for (i = strlen (asmspec) - 1; i >= 0; i--)
780 if (! ISDIGIT (asmspec[i]))
782 if (asmspec[0] != 0 && i < 0)
785 if (i < FIRST_PSEUDO_REGISTER && i >= 0)
791 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
793 && ! strcmp (asmspec, strip_reg_name (reg_names[i])))
796 #ifdef ADDITIONAL_REGISTER_NAMES
798 static const struct { const char *const name; const int number; } table[]
799 = ADDITIONAL_REGISTER_NAMES;
801 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
803 && ! strcmp (asmspec, table[i].name))
804 return table[i].number;
806 #endif /* ADDITIONAL_REGISTER_NAMES */
808 if (!strcmp (asmspec, "memory"))
811 if (!strcmp (asmspec, "cc"))
820 /* Return true if DECL's initializer is suitable for a BSS section. */
823 bss_initializer_p (tree decl)
825 return (DECL_INITIAL (decl) == NULL
826 || DECL_INITIAL (decl) == error_mark_node
827 || (flag_zero_initialized_in_bss
828 /* Leave constant zeroes in .rodata so they
830 && !TREE_READONLY (decl)
831 && initializer_zerop (DECL_INITIAL (decl))));
834 /* Compute the alignment of variable specified by DECL.
835 DONT_OUTPUT_DATA is from assemble_variable. */
838 align_variable (tree decl, bool dont_output_data)
840 unsigned int align = DECL_ALIGN (decl);
842 /* In the case for initialing an array whose length isn't specified,
843 where we have not yet been able to do the layout,
844 figure out the proper alignment now. */
845 if (dont_output_data && DECL_SIZE (decl) == 0
846 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
847 align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
849 /* Some object file formats have a maximum alignment which they support.
850 In particular, a.out format supports a maximum alignment of 4. */
851 if (align > MAX_OFILE_ALIGNMENT)
853 warning (0, "alignment of %q+D is greater than maximum object "
854 "file alignment. Using %d", decl,
855 MAX_OFILE_ALIGNMENT/BITS_PER_UNIT);
856 align = MAX_OFILE_ALIGNMENT;
859 /* On some machines, it is good to increase alignment sometimes. */
860 if (! DECL_USER_ALIGN (decl))
862 #ifdef DATA_ALIGNMENT
863 align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
865 #ifdef CONSTANT_ALIGNMENT
866 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
867 align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl), align);
871 /* Reset the alignment in case we have made it tighter, so we can benefit
872 from it in get_pointer_alignment. */
873 DECL_ALIGN (decl) = align;
876 /* Return the section into which the given VAR_DECL or CONST_DECL
877 should be placed. PREFER_NOSWITCH_P is true if a noswitch
878 section should be used wherever possible. */
881 get_variable_section (tree decl, bool prefer_noswitch_p)
885 /* If the decl has been given an explicit section name, then it
886 isn't common, and shouldn't be handled as such. */
887 if (DECL_COMMON (decl) && DECL_SECTION_NAME (decl) == NULL)
889 if (DECL_THREAD_LOCAL_P (decl))
890 return tls_comm_section;
891 if (TREE_PUBLIC (decl) && bss_initializer_p (decl))
895 if (DECL_INITIAL (decl) == error_mark_node)
896 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
897 else if (DECL_INITIAL (decl))
898 reloc = compute_reloc_for_constant (DECL_INITIAL (decl));
902 resolve_unique_section (decl, reloc, flag_data_sections);
903 if (IN_NAMED_SECTION (decl))
904 return get_named_section (decl, NULL, reloc);
906 if (!DECL_THREAD_LOCAL_P (decl)
907 && !(prefer_noswitch_p && targetm.have_switchable_bss_sections)
908 && bss_initializer_p (decl))
910 if (!TREE_PUBLIC (decl))
911 return lcomm_section;
912 if (bss_noswitch_section)
913 return bss_noswitch_section;
916 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
919 /* Return the block into which object_block DECL should be placed. */
921 static struct object_block *
922 get_block_for_decl (tree decl)
926 if (TREE_CODE (decl) == VAR_DECL)
928 /* The object must be defined in this translation unit. */
929 if (DECL_EXTERNAL (decl))
932 /* There's no point using object blocks for something that is
933 isolated by definition. */
934 if (DECL_ONE_ONLY (decl))
938 /* We can only calculate block offsets if the decl has a known
940 if (DECL_SIZE_UNIT (decl) == NULL)
942 if (!host_integerp (DECL_SIZE_UNIT (decl), 1))
945 /* Find out which section should contain DECL. We cannot put it into
946 an object block if it requires a standalone definition. */
947 if (TREE_CODE (decl) == VAR_DECL)
948 align_variable (decl, 0);
949 sect = get_variable_section (decl, true);
950 if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
953 return get_block_for_section (sect);
956 /* Make sure block symbol SYMBOL is in block BLOCK. */
959 change_symbol_block (rtx symbol, struct object_block *block)
961 if (block != SYMBOL_REF_BLOCK (symbol))
963 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol) < 0);
964 SYMBOL_REF_BLOCK (symbol) = block;
968 /* Return true if it is possible to put DECL in an object_block. */
971 use_blocks_for_decl_p (tree decl)
973 /* Only data DECLs can be placed into object blocks. */
974 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != CONST_DECL)
977 /* Detect decls created by dw2_force_const_mem. Such decls are
978 special because DECL_INITIAL doesn't specify the decl's true value.
979 dw2_output_indirect_constants will instead call assemble_variable
980 with dont_output_data set to 1 and then print the contents itself. */
981 if (DECL_INITIAL (decl) == decl)
984 /* If this decl is an alias, then we don't want to emit a definition. */
985 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl)))
991 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
992 have static storage duration. In other words, it should not be an
993 automatic variable, including PARM_DECLs.
995 There is, however, one exception: this function handles variables
996 explicitly placed in a particular register by the user.
998 This is never called for PARM_DECL nodes. */
1001 make_decl_rtl (tree decl)
1003 const char *name = 0;
1007 /* Check that we are not being given an automatic variable. */
1008 gcc_assert (TREE_CODE (decl) != PARM_DECL
1009 && TREE_CODE (decl) != RESULT_DECL);
1011 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1012 gcc_assert (TREE_CODE (decl) != VAR_DECL
1013 || TREE_STATIC (decl)
1014 || TREE_PUBLIC (decl)
1015 || DECL_EXTERNAL (decl)
1016 || DECL_REGISTER (decl));
1018 /* And that we were not given a type or a label. */
1019 gcc_assert (TREE_CODE (decl) != TYPE_DECL
1020 && TREE_CODE (decl) != LABEL_DECL);
1022 /* For a duplicate declaration, we can be called twice on the
1023 same DECL node. Don't discard the RTL already made. */
1024 if (DECL_RTL_SET_P (decl))
1026 /* If the old RTL had the wrong mode, fix the mode. */
1027 x = DECL_RTL (decl);
1028 if (GET_MODE (x) != DECL_MODE (decl))
1029 SET_DECL_RTL (decl, adjust_address_nv (x, DECL_MODE (decl), 0));
1031 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1034 /* ??? Another way to do this would be to maintain a hashed
1035 table of such critters. Instead of adding stuff to a DECL
1036 to give certain attributes to it, we could use an external
1037 hash map from DECL to set of attributes. */
1039 /* Let the target reassign the RTL if it wants.
1040 This is necessary, for example, when one machine specific
1041 decl attribute overrides another. */
1042 targetm.encode_section_info (decl, DECL_RTL (decl), false);
1044 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1045 on the new decl information. */
1047 && GET_CODE (XEXP (x, 0)) == SYMBOL_REF
1048 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x, 0)))
1049 change_symbol_block (XEXP (x, 0), get_block_for_decl (decl));
1051 /* Make this function static known to the mudflap runtime. */
1052 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1053 mudflap_enqueue_decl (decl);
1058 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1060 if (name[0] != '*' && TREE_CODE (decl) != FUNCTION_DECL
1061 && DECL_REGISTER (decl))
1063 error ("register name not specified for %q+D", decl);
1065 else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1067 const char *asmspec = name+1;
1068 reg_number = decode_reg_name (asmspec);
1069 /* First detect errors in declaring global registers. */
1070 if (reg_number == -1)
1071 error ("register name not specified for %q+D", decl);
1072 else if (reg_number < 0)
1073 error ("invalid register name for %q+D", decl);
1074 else if (TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
1075 error ("data type of %q+D isn%'t suitable for a register",
1077 else if (! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl))))
1078 error ("register specified for %q+D isn%'t suitable for data type",
1080 /* Now handle properly declared static register variables. */
1085 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
1087 DECL_INITIAL (decl) = 0;
1088 error ("global register variable has initial value");
1090 if (TREE_THIS_VOLATILE (decl))
1091 warning (OPT_Wvolatile_register_var,
1092 "optimization may eliminate reads and/or "
1093 "writes to register variables");
1095 /* If the user specified one of the eliminables registers here,
1096 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1097 confused with that register and be eliminated. This usage is
1098 somewhat suspect... */
1100 SET_DECL_RTL (decl, gen_rtx_raw_REG (DECL_MODE (decl), reg_number));
1101 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
1102 REG_USERVAR_P (DECL_RTL (decl)) = 1;
1104 if (TREE_STATIC (decl))
1106 /* Make this register global, so not usable for anything
1108 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1109 name = IDENTIFIER_POINTER (DECL_NAME (decl));
1110 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
1112 nregs = hard_regno_nregs[reg_number][DECL_MODE (decl)];
1114 globalize_reg (reg_number + --nregs);
1117 /* As a register variable, it has no section. */
1121 /* Now handle ordinary static variables and functions (in memory).
1122 Also handle vars declared register invalidly. */
1123 else if (name[0] == '*')
1125 #ifdef REGISTER_PREFIX
1126 if (strlen (REGISTER_PREFIX) != 0)
1128 reg_number = decode_reg_name (name);
1129 if (reg_number >= 0 || reg_number == -3)
1130 error ("register name given for non-register variable %q+D", decl);
1135 /* Specifying a section attribute on a variable forces it into a
1136 non-.bss section, and thus it cannot be common. */
1137 if (TREE_CODE (decl) == VAR_DECL
1138 && DECL_SECTION_NAME (decl) != NULL_TREE
1139 && DECL_INITIAL (decl) == NULL_TREE
1140 && DECL_COMMON (decl))
1141 DECL_COMMON (decl) = 0;
1143 /* Variables can't be both common and weak. */
1144 if (TREE_CODE (decl) == VAR_DECL && DECL_WEAK (decl))
1145 DECL_COMMON (decl) = 0;
1147 if (use_object_blocks_p () && use_blocks_for_decl_p (decl))
1148 x = create_block_symbol (name, get_block_for_decl (decl), -1);
1150 x = gen_rtx_SYMBOL_REF (Pmode, name);
1151 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
1152 SET_SYMBOL_REF_DECL (x, decl);
1154 x = gen_rtx_MEM (DECL_MODE (decl), x);
1155 if (TREE_CODE (decl) != FUNCTION_DECL)
1156 set_mem_attributes (x, decl, 1);
1157 SET_DECL_RTL (decl, x);
1159 /* Optionally set flags or add text to the name to record information
1160 such as that it is a function name.
1161 If the name is changed, the macro ASM_OUTPUT_LABELREF
1162 will have to know how to strip this information. */
1163 targetm.encode_section_info (decl, DECL_RTL (decl), true);
1165 /* Make this function static known to the mudflap runtime. */
1166 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1167 mudflap_enqueue_decl (decl);
1170 /* Output a string of literal assembler code
1171 for an `asm' keyword used between functions. */
1174 assemble_asm (tree string)
1178 if (TREE_CODE (string) == ADDR_EXPR)
1179 string = TREE_OPERAND (string, 0);
1181 fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string));
1184 /* Record an element in the table of global destructors. SYMBOL is
1185 a SYMBOL_REF of the function to be called; PRIORITY is a number
1186 between 0 and MAX_INIT_PRIORITY. */
1189 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED,
1190 int priority ATTRIBUTE_UNUSED)
1192 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1193 /* Tell GNU LD that this is part of the static destructor set.
1194 This will work for any system that uses stabs, most usefully
1196 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1197 dbxout_stab_value_label (XSTR (symbol, 0));
1199 sorry ("global destructors not supported on this target");
1204 default_named_section_asm_out_destructor (rtx symbol, int priority)
1206 const char *section = ".dtors";
1209 /* ??? This only works reliably with the GNU linker. */
1210 if (priority != DEFAULT_INIT_PRIORITY)
1212 sprintf (buf, ".dtors.%.5u",
1213 /* Invert the numbering so the linker puts us in the proper
1214 order; constructors are run from right to left, and the
1215 linker sorts in increasing order. */
1216 MAX_INIT_PRIORITY - priority);
1220 switch_to_section (get_section (section, SECTION_WRITE, NULL));
1221 assemble_align (POINTER_SIZE);
1222 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1225 #ifdef DTORS_SECTION_ASM_OP
1227 default_dtor_section_asm_out_destructor (rtx symbol,
1228 int priority ATTRIBUTE_UNUSED)
1230 switch_to_section (dtors_section);
1231 assemble_align (POINTER_SIZE);
1232 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1236 /* Likewise for global constructors. */
1239 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED,
1240 int priority ATTRIBUTE_UNUSED)
1242 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1243 /* Tell GNU LD that this is part of the static destructor set.
1244 This will work for any system that uses stabs, most usefully
1246 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1247 dbxout_stab_value_label (XSTR (symbol, 0));
1249 sorry ("global constructors not supported on this target");
1254 default_named_section_asm_out_constructor (rtx symbol, int priority)
1256 const char *section = ".ctors";
1259 /* ??? This only works reliably with the GNU linker. */
1260 if (priority != DEFAULT_INIT_PRIORITY)
1262 sprintf (buf, ".ctors.%.5u",
1263 /* Invert the numbering so the linker puts us in the proper
1264 order; constructors are run from right to left, and the
1265 linker sorts in increasing order. */
1266 MAX_INIT_PRIORITY - priority);
1270 switch_to_section (get_section (section, SECTION_WRITE, NULL));
1271 assemble_align (POINTER_SIZE);
1272 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1275 #ifdef CTORS_SECTION_ASM_OP
1277 default_ctor_section_asm_out_constructor (rtx symbol,
1278 int priority ATTRIBUTE_UNUSED)
1280 switch_to_section (ctors_section);
1281 assemble_align (POINTER_SIZE);
1282 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1286 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1287 a nonzero value if the constant pool should be output before the
1288 start of the function, or a zero value if the pool should output
1289 after the end of the function. The default is to put it before the
1292 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1293 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1296 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1297 to be output to assembler.
1298 Set first_global_object_name and weak_global_object_name as appropriate. */
1301 notice_global_symbol (tree decl)
1303 const char **type = &first_global_object_name;
1305 if (first_global_object_name
1306 || !TREE_PUBLIC (decl)
1307 || DECL_EXTERNAL (decl)
1308 || !DECL_NAME (decl)
1309 || (TREE_CODE (decl) != FUNCTION_DECL
1310 && (TREE_CODE (decl) != VAR_DECL
1311 || (DECL_COMMON (decl)
1312 && (DECL_INITIAL (decl) == 0
1313 || DECL_INITIAL (decl) == error_mark_node))))
1314 || !MEM_P (DECL_RTL (decl)))
1317 /* We win when global object is found, but it is useful to know about weak
1318 symbol as well so we can produce nicer unique names. */
1319 if (DECL_WEAK (decl) || DECL_ONE_ONLY (decl))
1320 type = &weak_global_object_name;
1326 rtx decl_rtl = DECL_RTL (decl);
1328 p = targetm.strip_name_encoding (XSTR (XEXP (decl_rtl, 0), 0));
1329 name = ggc_strdup (p);
1335 /* Output assembler code for the constant pool of a function and associated
1336 with defining the name of the function. DECL describes the function.
1337 NAME is the function's name. For the constant pool, we use the current
1338 constant pool data. */
1341 assemble_start_function (tree decl, const char *fnname)
1344 char tmp_label[100];
1345 bool hot_label_written = false;
1347 cfun->unlikely_text_section_name = NULL;
1349 first_function_block_is_cold = false;
1350 if (flag_reorder_blocks_and_partition)
1352 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
1353 cfun->hot_section_label = ggc_strdup (tmp_label);
1354 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDB", const_labelno);
1355 cfun->cold_section_label = ggc_strdup (tmp_label);
1356 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTE", const_labelno);
1357 cfun->hot_section_end_label = ggc_strdup (tmp_label);
1358 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDE", const_labelno);
1359 cfun->cold_section_end_label = ggc_strdup (tmp_label);
1364 cfun->hot_section_label = NULL;
1365 cfun->cold_section_label = NULL;
1366 cfun->hot_section_end_label = NULL;
1367 cfun->cold_section_end_label = NULL;
1370 /* The following code does not need preprocessing in the assembler. */
1374 if (CONSTANT_POOL_BEFORE_FUNCTION)
1375 output_constant_pool (fnname, decl);
1377 resolve_unique_section (decl, 0, flag_function_sections);
1379 /* Make sure the not and cold text (code) sections are properly
1380 aligned. This is necessary here in the case where the function
1381 has both hot and cold sections, because we don't want to re-set
1382 the alignment when the section switch happens mid-function. */
1384 if (flag_reorder_blocks_and_partition)
1386 switch_to_section (unlikely_text_section ());
1387 assemble_align (DECL_ALIGN (decl));
1388 ASM_OUTPUT_LABEL (asm_out_file, cfun->cold_section_label);
1390 /* When the function starts with a cold section, we need to explicitly
1391 align the hot section and write out the hot section label.
1392 But if the current function is a thunk, we do not have a CFG. */
1393 if (!current_function_is_thunk
1394 && BB_PARTITION (ENTRY_BLOCK_PTR->next_bb) == BB_COLD_PARTITION)
1396 switch_to_section (text_section);
1397 assemble_align (DECL_ALIGN (decl));
1398 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_label);
1399 hot_label_written = true;
1400 first_function_block_is_cold = true;
1403 else if (DECL_SECTION_NAME (decl))
1405 /* Calls to function_section rely on first_function_block_is_cold
1406 being accurate. The first block may be cold even if we aren't
1407 doing partitioning, if the entire function was decided by
1408 choose_function_section (predict.c) to be cold. */
1410 initialize_cold_section_name ();
1412 if (cfun->unlikely_text_section_name
1413 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
1414 cfun->unlikely_text_section_name) == 0)
1415 first_function_block_is_cold = true;
1418 in_cold_section_p = first_function_block_is_cold;
1420 /* Switch to the correct text section for the start of the function. */
1422 switch_to_section (function_section (decl));
1423 if (flag_reorder_blocks_and_partition
1424 && !hot_label_written)
1425 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_label);
1427 /* Tell assembler to move to target machine's alignment for functions. */
1428 align = floor_log2 (DECL_ALIGN (decl) / BITS_PER_UNIT);
1431 ASM_OUTPUT_ALIGN (asm_out_file, align);
1434 /* Handle a user-specified function alignment.
1435 Note that we still need to align to DECL_ALIGN, as above,
1436 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1437 if (! DECL_USER_ALIGN (decl)
1438 && align_functions_log > align
1439 && cfun->function_frequency != FUNCTION_FREQUENCY_UNLIKELY_EXECUTED)
1441 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1442 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
1443 align_functions_log, align_functions - 1);
1445 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1449 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1450 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1453 (*debug_hooks->begin_function) (decl);
1455 /* Make function name accessible from other files, if appropriate. */
1457 if (TREE_PUBLIC (decl))
1459 notice_global_symbol (decl);
1461 globalize_decl (decl);
1463 maybe_assemble_visibility (decl);
1466 if (DECL_PRESERVE_P (decl))
1467 targetm.asm_out.mark_decl_preserved (fnname);
1469 /* Do any machine/system dependent processing of the function name. */
1470 #ifdef ASM_DECLARE_FUNCTION_NAME
1471 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1473 /* Standard thing is just output label for the function. */
1474 ASM_OUTPUT_LABEL (asm_out_file, fnname);
1475 #endif /* ASM_DECLARE_FUNCTION_NAME */
1478 /* Output assembler code associated with defining the size of the
1479 function. DECL describes the function. NAME is the function's name. */
1482 assemble_end_function (tree decl, const char *fnname ATTRIBUTE_UNUSED)
1484 #ifdef ASM_DECLARE_FUNCTION_SIZE
1485 /* We could have switched section in the middle of the function. */
1486 if (flag_reorder_blocks_and_partition)
1487 switch_to_section (function_section (decl));
1488 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1490 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1492 output_constant_pool (fnname, decl);
1493 switch_to_section (function_section (decl)); /* need to switch back */
1495 /* Output labels for end of hot/cold text sections (to be used by
1497 if (flag_reorder_blocks_and_partition)
1499 section *save_text_section;
1501 save_text_section = in_section;
1502 switch_to_section (unlikely_text_section ());
1503 ASM_OUTPUT_LABEL (asm_out_file, cfun->cold_section_end_label);
1504 if (first_function_block_is_cold)
1505 switch_to_section (text_section);
1507 switch_to_section (function_section (decl));
1508 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_end_label);
1509 switch_to_section (save_text_section);
1513 /* Assemble code to leave SIZE bytes of zeros. */
1516 assemble_zeros (unsigned HOST_WIDE_INT size)
1518 /* Do no output if -fsyntax-only. */
1519 if (flag_syntax_only)
1522 #ifdef ASM_NO_SKIP_IN_TEXT
1523 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1524 so we must output 0s explicitly in the text section. */
1525 if (ASM_NO_SKIP_IN_TEXT && (in_section->common.flags & SECTION_CODE) != 0)
1527 unsigned HOST_WIDE_INT i;
1528 for (i = 0; i < size; i++)
1529 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1534 ASM_OUTPUT_SKIP (asm_out_file, size);
1537 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1540 assemble_align (int align)
1542 if (align > BITS_PER_UNIT)
1544 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1548 /* Assemble a string constant with the specified C string as contents. */
1551 assemble_string (const char *p, int size)
1556 /* If the string is very long, split it up. */
1560 int thissize = size - pos;
1561 if (thissize > maximum)
1564 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1572 /* A noswitch_section_callback for lcomm_section. */
1575 emit_local (tree decl ATTRIBUTE_UNUSED,
1576 const char *name ATTRIBUTE_UNUSED,
1577 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1578 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1580 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1581 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name,
1582 size, DECL_ALIGN (decl));
1584 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1585 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, DECL_ALIGN (decl));
1588 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1593 /* A noswitch_section_callback for bss_noswitch_section. */
1595 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
1597 emit_bss (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 #if defined ASM_OUTPUT_ALIGNED_BSS
1603 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size, DECL_ALIGN (decl));
1606 ASM_OUTPUT_BSS (asm_out_file, decl, name, size, rounded);
1612 /* A noswitch_section_callback for comm_section. */
1615 emit_common (tree decl ATTRIBUTE_UNUSED,
1616 const char *name ATTRIBUTE_UNUSED,
1617 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1618 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1620 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1621 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name,
1622 size, DECL_ALIGN (decl));
1624 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1625 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, DECL_ALIGN (decl));
1628 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded);
1633 /* A noswitch_section_callback for tls_comm_section. */
1636 emit_tls_common (tree decl ATTRIBUTE_UNUSED,
1637 const char *name ATTRIBUTE_UNUSED,
1638 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1639 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1641 #ifdef ASM_OUTPUT_TLS_COMMON
1642 ASM_OUTPUT_TLS_COMMON (asm_out_file, decl, name, size);
1645 sorry ("thread-local COMMON data not implemented");
1650 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1651 NAME is the name of DECL's SYMBOL_REF. */
1654 assemble_noswitch_variable (tree decl, const char *name, section *sect)
1656 unsigned HOST_WIDE_INT size, rounded;
1658 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
1661 /* Don't allocate zero bytes of common,
1662 since that means "undefined external" in the linker. */
1666 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1667 so that each uninitialized object starts on such a boundary. */
1668 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
1669 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1670 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1672 if (!sect->noswitch.callback (decl, name, size, rounded)
1673 && (unsigned HOST_WIDE_INT) DECL_ALIGN_UNIT (decl) > rounded)
1674 warning (0, "requested alignment for %q+D is greater than "
1675 "implemented alignment of %wu", decl, rounded);
1678 /* A subroutine of assemble_variable. Output the label and contents of
1679 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1680 is as for assemble_variable. */
1683 assemble_variable_contents (tree decl, const char *name,
1684 bool dont_output_data)
1686 /* Do any machine/system dependent processing of the object. */
1687 #ifdef ASM_DECLARE_OBJECT_NAME
1688 last_assemble_variable_decl = decl;
1689 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
1691 /* Standard thing is just output label for the object. */
1692 ASM_OUTPUT_LABEL (asm_out_file, name);
1693 #endif /* ASM_DECLARE_OBJECT_NAME */
1695 if (!dont_output_data)
1697 if (DECL_INITIAL (decl)
1698 && DECL_INITIAL (decl) != error_mark_node
1699 && !initializer_zerop (DECL_INITIAL (decl)))
1700 /* Output the actual data. */
1701 output_constant (DECL_INITIAL (decl),
1702 tree_low_cst (DECL_SIZE_UNIT (decl), 1),
1705 /* Leave space for it. */
1706 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl), 1));
1710 /* Assemble everything that is needed for a variable or function declaration.
1711 Not used for automatic variables, and not used for function definitions.
1712 Should not be called for variables of incomplete structure type.
1714 TOP_LEVEL is nonzero if this variable has file scope.
1715 AT_END is nonzero if this is the special handling, at end of compilation,
1716 to define things that have had only tentative definitions.
1717 DONT_OUTPUT_DATA if nonzero means don't actually output the
1718 initial value (that will be done by the caller). */
1721 assemble_variable (tree decl, int top_level ATTRIBUTE_UNUSED,
1722 int at_end ATTRIBUTE_UNUSED, int dont_output_data)
1725 rtx decl_rtl, symbol;
1728 if (lang_hooks.decls.prepare_assemble_variable)
1729 lang_hooks.decls.prepare_assemble_variable (decl);
1731 last_assemble_variable_decl = 0;
1733 /* Normally no need to say anything here for external references,
1734 since assemble_external is called by the language-specific code
1735 when a declaration is first seen. */
1737 if (DECL_EXTERNAL (decl))
1740 /* Output no assembler code for a function declaration.
1741 Only definitions of functions output anything. */
1743 if (TREE_CODE (decl) == FUNCTION_DECL)
1746 /* Do nothing for global register variables. */
1747 if (DECL_RTL_SET_P (decl) && REG_P (DECL_RTL (decl)))
1749 TREE_ASM_WRITTEN (decl) = 1;
1753 /* If type was incomplete when the variable was declared,
1754 see if it is complete now. */
1756 if (DECL_SIZE (decl) == 0)
1757 layout_decl (decl, 0);
1759 /* Still incomplete => don't allocate it; treat the tentative defn
1760 (which is what it must have been) as an `extern' reference. */
1762 if (!dont_output_data && DECL_SIZE (decl) == 0)
1764 error ("storage size of %q+D isn%'t known", decl);
1765 TREE_ASM_WRITTEN (decl) = 1;
1769 /* The first declaration of a variable that comes through this function
1770 decides whether it is global (in C, has external linkage)
1771 or local (in C, has internal linkage). So do nothing more
1772 if this function has already run. */
1774 if (TREE_ASM_WRITTEN (decl))
1777 /* Make sure targetm.encode_section_info is invoked before we set
1779 decl_rtl = DECL_RTL (decl);
1781 TREE_ASM_WRITTEN (decl) = 1;
1783 /* Do no output if -fsyntax-only. */
1784 if (flag_syntax_only)
1789 if (! dont_output_data
1790 && ! host_integerp (DECL_SIZE_UNIT (decl), 1))
1792 error ("size of variable %q+D is too large", decl);
1796 gcc_assert (MEM_P (decl_rtl));
1797 gcc_assert (GET_CODE (XEXP (decl_rtl, 0)) == SYMBOL_REF);
1798 symbol = XEXP (decl_rtl, 0);
1799 name = XSTR (symbol, 0);
1800 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
1801 notice_global_symbol (decl);
1803 /* Compute the alignment of this data. */
1805 align_variable (decl, dont_output_data);
1806 set_mem_align (decl_rtl, DECL_ALIGN (decl));
1808 if (TREE_PUBLIC (decl))
1809 maybe_assemble_visibility (decl);
1811 if (DECL_PRESERVE_P (decl))
1812 targetm.asm_out.mark_decl_preserved (name);
1814 /* First make the assembler name(s) global if appropriate. */
1815 sect = get_variable_section (decl, false);
1816 if (TREE_PUBLIC (decl)
1818 && (sect->common.flags & SECTION_COMMON) == 0)
1819 globalize_decl (decl);
1821 /* Output any data that we will need to use the address of. */
1822 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
1823 output_addressed_constants (DECL_INITIAL (decl));
1825 /* dbxout.c needs to know this. */
1826 if (sect && (sect->common.flags & SECTION_CODE) != 0)
1827 DECL_IN_TEXT_SECTION (decl) = 1;
1829 /* If the decl is part of an object_block, make sure that the decl
1830 has been positioned within its block, but do not write out its
1831 definition yet. output_object_blocks will do that later. */
1832 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
1834 gcc_assert (!dont_output_data);
1835 place_block_symbol (symbol);
1837 else if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
1838 assemble_noswitch_variable (decl, name, sect);
1841 switch_to_section (sect);
1842 if (DECL_ALIGN (decl) > BITS_PER_UNIT)
1843 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (DECL_ALIGN_UNIT (decl)));
1844 assemble_variable_contents (decl, name, dont_output_data);
1848 /* Return 1 if type TYPE contains any pointers. */
1851 contains_pointers_p (tree type)
1853 switch (TREE_CODE (type))
1856 case REFERENCE_TYPE:
1857 /* I'm not sure whether OFFSET_TYPE needs this treatment,
1858 so I'll play safe and return 1. */
1864 case QUAL_UNION_TYPE:
1867 /* For a type that has fields, see if the fields have pointers. */
1868 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
1869 if (TREE_CODE (fields) == FIELD_DECL
1870 && contains_pointers_p (TREE_TYPE (fields)))
1876 /* An array type contains pointers if its element type does. */
1877 return contains_pointers_p (TREE_TYPE (type));
1884 /* In unit-at-a-time mode, we delay assemble_external processing until
1885 the compilation unit is finalized. This is the best we can do for
1886 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
1887 it all the way to final. See PR 17982 for further discussion. */
1888 static GTY(()) tree pending_assemble_externals;
1890 #ifdef ASM_OUTPUT_EXTERNAL
1891 /* True if DECL is a function decl for which no out-of-line copy exists.
1892 It is assumed that DECL's assembler name has been set. */
1895 incorporeal_function_p (tree decl)
1897 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1901 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
1902 && DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA)
1905 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1906 if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0)
1912 /* Actually do the tests to determine if this is necessary, and invoke
1913 ASM_OUTPUT_EXTERNAL. */
1915 assemble_external_real (tree decl)
1917 rtx rtl = DECL_RTL (decl);
1919 if (MEM_P (rtl) && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
1920 && !SYMBOL_REF_USED (XEXP (rtl, 0))
1921 && !incorporeal_function_p (decl))
1923 /* Some systems do require some output. */
1924 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
1925 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
1931 process_pending_assemble_externals (void)
1933 #ifdef ASM_OUTPUT_EXTERNAL
1935 for (list = pending_assemble_externals; list; list = TREE_CHAIN (list))
1936 assemble_external_real (TREE_VALUE (list));
1938 pending_assemble_externals = 0;
1942 /* Output something to declare an external symbol to the assembler.
1943 (Most assemblers don't need this, so we normally output nothing.)
1944 Do nothing if DECL is not external. */
1947 assemble_external (tree decl ATTRIBUTE_UNUSED)
1949 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
1950 main body of this code is only rarely exercised. To provide some
1951 testing, on all platforms, we make sure that the ASM_OUT_FILE is
1952 open. If it's not, we should not be calling this function. */
1953 gcc_assert (asm_out_file);
1955 #ifdef ASM_OUTPUT_EXTERNAL
1956 if (!DECL_P (decl) || !DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
1959 if (flag_unit_at_a_time)
1960 pending_assemble_externals = tree_cons (0, decl,
1961 pending_assemble_externals);
1963 assemble_external_real (decl);
1967 /* Similar, for calling a library function FUN. */
1970 assemble_external_libcall (rtx fun)
1972 /* Declare library function name external when first used, if nec. */
1973 if (! SYMBOL_REF_USED (fun))
1975 SYMBOL_REF_USED (fun) = 1;
1976 targetm.asm_out.external_libcall (fun);
1980 /* Assemble a label named NAME. */
1983 assemble_label (const char *name)
1985 ASM_OUTPUT_LABEL (asm_out_file, name);
1988 /* Set the symbol_referenced flag for ID. */
1990 mark_referenced (tree id)
1992 TREE_SYMBOL_REFERENCED (id) = 1;
1995 /* Set the symbol_referenced flag for DECL and notify callgraph. */
1997 mark_decl_referenced (tree decl)
1999 if (TREE_CODE (decl) == FUNCTION_DECL)
2001 /* Extern inline functions don't become needed when referenced.
2002 If we know a method will be emitted in other TU and no new
2003 functions can be marked reachable, just use the external
2005 struct cgraph_node *node = cgraph_node (decl);
2006 if (!DECL_EXTERNAL (decl)
2007 && (!node->local.vtable_method || !cgraph_global_info_ready
2008 || !node->local.finalized))
2009 cgraph_mark_needed_node (node);
2011 else if (TREE_CODE (decl) == VAR_DECL)
2013 struct cgraph_varpool_node *node = cgraph_varpool_node (decl);
2014 cgraph_varpool_mark_needed_node (node);
2015 /* C++ frontend use mark_decl_references to force COMDAT variables
2016 to be output that might appear dead otherwise. */
2017 node->force_output = true;
2019 /* else do nothing - we can get various sorts of CST nodes here,
2020 which do not need to be marked. */
2024 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2025 until we find an identifier that is not itself a transparent alias.
2026 Modify the alias passed to it by reference (and all aliases on the
2027 way to the ultimate target), such that they do not have to be
2028 followed again, and return the ultimate target of the alias
2032 ultimate_transparent_alias_target (tree *alias)
2034 tree target = *alias;
2036 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
2038 gcc_assert (TREE_CHAIN (target));
2039 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
2040 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
2041 && ! TREE_CHAIN (target));
2048 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2049 starts with a *, the rest of NAME is output verbatim. Otherwise
2050 NAME is transformed in a target-specific way (usually by the
2051 addition of an underscore). */
2054 assemble_name_raw (FILE *file, const char *name)
2057 fputs (&name[1], file);
2059 ASM_OUTPUT_LABELREF (file, name);
2062 /* Like assemble_name_raw, but should be used when NAME might refer to
2063 an entity that is also represented as a tree (like a function or
2064 variable). If NAME does refer to such an entity, that entity will
2065 be marked as referenced. */
2068 assemble_name (FILE *file, const char *name)
2070 const char *real_name;
2073 real_name = targetm.strip_name_encoding (name);
2075 id = maybe_get_identifier (real_name);
2080 mark_referenced (id);
2081 ultimate_transparent_alias_target (&id);
2083 name = IDENTIFIER_POINTER (id);
2084 gcc_assert (! TREE_CHAIN (id));
2087 assemble_name_raw (file, name);
2090 /* Allocate SIZE bytes writable static space with a gensym name
2091 and return an RTX to refer to its address. */
2094 assemble_static_space (unsigned HOST_WIDE_INT size)
2097 const char *namestring;
2100 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2102 namestring = ggc_strdup (name);
2104 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2105 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2107 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2108 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2111 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2112 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2115 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2116 so that each uninitialized object starts on such a boundary. */
2117 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2118 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2119 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2120 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2121 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2122 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2129 /* Assemble the static constant template for function entry trampolines.
2130 This is done at most once per compilation.
2131 Returns an RTX for the address of the template. */
2133 static GTY(()) rtx initial_trampoline;
2135 #ifdef TRAMPOLINE_TEMPLATE
2137 assemble_trampoline_template (void)
2144 if (initial_trampoline)
2145 return initial_trampoline;
2147 /* By default, put trampoline templates in read-only data section. */
2149 #ifdef TRAMPOLINE_SECTION
2150 switch_to_section (TRAMPOLINE_SECTION);
2152 switch_to_section (readonly_data_section);
2155 /* Write the assembler code to define one. */
2156 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2159 ASM_OUTPUT_ALIGN (asm_out_file, align);
2162 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2163 TRAMPOLINE_TEMPLATE (asm_out_file);
2165 /* Record the rtl to refer to it. */
2166 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2167 name = ggc_strdup (label);
2168 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2169 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2171 initial_trampoline = gen_rtx_MEM (BLKmode, symbol);
2172 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2174 return initial_trampoline;
2178 /* A and B are either alignments or offsets. Return the minimum alignment
2179 that may be assumed after adding the two together. */
2181 static inline unsigned
2182 min_align (unsigned int a, unsigned int b)
2184 return (a | b) & -(a | b);
2187 /* Return the assembler directive for creating a given kind of integer
2188 object. SIZE is the number of bytes in the object and ALIGNED_P
2189 indicates whether it is known to be aligned. Return NULL if the
2190 assembly dialect has no such directive.
2192 The returned string should be printed at the start of a new line and
2193 be followed immediately by the object's initial value. */
2196 integer_asm_op (int size, int aligned_p)
2198 struct asm_int_op *ops;
2201 ops = &targetm.asm_out.aligned_op;
2203 ops = &targetm.asm_out.unaligned_op;
2208 return targetm.asm_out.byte_op;
2222 /* Use directive OP to assemble an integer object X. Print OP at the
2223 start of the line, followed immediately by the value of X. */
2226 assemble_integer_with_op (const char *op, rtx x)
2228 fputs (op, asm_out_file);
2229 output_addr_const (asm_out_file, x);
2230 fputc ('\n', asm_out_file);
2233 /* The default implementation of the asm_out.integer target hook. */
2236 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2237 unsigned int size ATTRIBUTE_UNUSED,
2238 int aligned_p ATTRIBUTE_UNUSED)
2240 const char *op = integer_asm_op (size, aligned_p);
2241 /* Avoid GAS bugs for large values. Specifically negative values whose
2242 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2243 if (size > UNITS_PER_WORD && size > POINTER_SIZE / BITS_PER_UNIT)
2245 return op && (assemble_integer_with_op (op, x), true);
2248 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2249 the alignment of the integer in bits. Return 1 if we were able to output
2250 the constant, otherwise 0. We must be able to output the constant,
2251 if FORCE is nonzero. */
2254 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2258 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2260 /* See if the target hook can handle this kind of object. */
2261 if (targetm.asm_out.integer (x, size, aligned_p))
2264 /* If the object is a multi-byte one, try splitting it up. Split
2265 it into words it if is multi-word, otherwise split it into bytes. */
2268 enum machine_mode omode, imode;
2269 unsigned int subalign;
2270 unsigned int subsize, i;
2272 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2273 subalign = MIN (align, subsize * BITS_PER_UNIT);
2274 omode = mode_for_size (subsize * BITS_PER_UNIT, MODE_INT, 0);
2275 imode = mode_for_size (size * BITS_PER_UNIT, MODE_INT, 0);
2277 for (i = 0; i < size; i += subsize)
2279 rtx partial = simplify_subreg (omode, x, imode, i);
2280 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2286 /* If we've printed some of it, but not all of it, there's no going
2291 gcc_assert (!force);
2297 assemble_real (REAL_VALUE_TYPE d, enum machine_mode mode, unsigned int align)
2299 long data[4] = {0, 0, 0, 0};
2301 int bitsize, nelts, nunits, units_per;
2303 /* This is hairy. We have a quantity of known size. real_to_target
2304 will put it into an array of *host* longs, 32 bits per element
2305 (even if long is more than 32 bits). We need to determine the
2306 number of array elements that are occupied (nelts) and the number
2307 of *target* min-addressable units that will be occupied in the
2308 object file (nunits). We cannot assume that 32 divides the
2309 mode's bitsize (size * BITS_PER_UNIT) evenly.
2311 size * BITS_PER_UNIT is used here to make sure that padding bits
2312 (which might appear at either end of the value; real_to_target
2313 will include the padding bits in its output array) are included. */
2315 nunits = GET_MODE_SIZE (mode);
2316 bitsize = nunits * BITS_PER_UNIT;
2317 nelts = CEIL (bitsize, 32);
2318 units_per = 32 / BITS_PER_UNIT;
2320 real_to_target (data, &d, mode);
2322 /* Put out the first word with the specified alignment. */
2323 assemble_integer (GEN_INT (data[0]), MIN (nunits, units_per), align, 1);
2324 nunits -= units_per;
2326 /* Subsequent words need only 32-bit alignment. */
2327 align = min_align (align, 32);
2329 for (i = 1; i < nelts; i++)
2331 assemble_integer (GEN_INT (data[i]), MIN (nunits, units_per), align, 1);
2332 nunits -= units_per;
2336 /* Given an expression EXP with a constant value,
2337 reduce it to the sum of an assembler symbol and an integer.
2338 Store them both in the structure *VALUE.
2339 EXP must be reducible. */
2341 struct addr_const GTY(())
2344 HOST_WIDE_INT offset;
2348 decode_addr_const (tree exp, struct addr_const *value)
2350 tree target = TREE_OPERAND (exp, 0);
2356 if (TREE_CODE (target) == COMPONENT_REF
2357 && host_integerp (byte_position (TREE_OPERAND (target, 1)), 0))
2360 offset += int_byte_position (TREE_OPERAND (target, 1));
2361 target = TREE_OPERAND (target, 0);
2363 else if (TREE_CODE (target) == ARRAY_REF
2364 || TREE_CODE (target) == ARRAY_RANGE_REF)
2366 offset += (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target)), 1)
2367 * tree_low_cst (TREE_OPERAND (target, 1), 0));
2368 target = TREE_OPERAND (target, 0);
2374 switch (TREE_CODE (target))
2378 x = DECL_RTL (target);
2382 x = gen_rtx_MEM (FUNCTION_MODE,
2383 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2391 x = output_constant_def (target, 1);
2398 gcc_assert (MEM_P (x));
2402 value->offset = offset;
2405 /* Uniquize all constants that appear in memory.
2406 Each constant in memory thus far output is recorded
2407 in `const_desc_table'. */
2409 struct constant_descriptor_tree GTY(())
2411 /* A MEM for the constant. */
2414 /* The value of the constant. */
2417 /* Hash of value. Computing the hash from value each time
2418 hashfn is called can't work properly, as that means recursive
2419 use of the hash table during hash table expansion. */
2423 static GTY((param_is (struct constant_descriptor_tree)))
2424 htab_t const_desc_htab;
2426 static struct constant_descriptor_tree * build_constant_desc (tree);
2427 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2429 /* Compute a hash code for a constant expression. */
2432 const_desc_hash (const void *ptr)
2434 return ((struct constant_descriptor_tree *)ptr)->hash;
2438 const_hash_1 (const tree exp)
2443 enum tree_code code = TREE_CODE (exp);
2445 /* Either set P and LEN to the address and len of something to hash and
2446 exit the switch or return a value. */
2451 p = (char *) &TREE_INT_CST (exp);
2452 len = sizeof TREE_INT_CST (exp);
2456 return real_hash (TREE_REAL_CST_PTR (exp));
2459 p = TREE_STRING_POINTER (exp);
2460 len = TREE_STRING_LENGTH (exp);
2464 return (const_hash_1 (TREE_REALPART (exp)) * 5
2465 + const_hash_1 (TREE_IMAGPART (exp)));
2469 unsigned HOST_WIDE_INT idx;
2472 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2474 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
2476 hi = hi * 603 + const_hash_1 (value);
2484 struct addr_const value;
2486 decode_addr_const (exp, &value);
2487 switch (GET_CODE (value.base))
2490 /* Don't hash the address of the SYMBOL_REF;
2491 only use the offset and the symbol name. */
2493 p = XSTR (value.base, 0);
2494 for (i = 0; p[i] != 0; i++)
2495 hi = ((hi * 613) + (unsigned) (p[i]));
2499 hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
2510 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2511 + const_hash_1 (TREE_OPERAND (exp, 1)));
2515 case NON_LVALUE_EXPR:
2516 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2519 /* A language specific constant. Just hash the code. */
2523 /* Compute hashing function. */
2525 for (i = 0; i < len; i++)
2526 hi = ((hi * 613) + (unsigned) (p[i]));
2531 /* Wrapper of compare_constant, for the htab interface. */
2533 const_desc_eq (const void *p1, const void *p2)
2535 const struct constant_descriptor_tree *c1 = p1;
2536 const struct constant_descriptor_tree *c2 = p2;
2537 if (c1->hash != c2->hash)
2539 return compare_constant (c1->value, c2->value);
2542 /* Compare t1 and t2, and return 1 only if they are known to result in
2543 the same bit pattern on output. */
2546 compare_constant (const tree t1, const tree t2)
2548 enum tree_code typecode;
2550 if (t1 == NULL_TREE)
2551 return t2 == NULL_TREE;
2552 if (t2 == NULL_TREE)
2555 if (TREE_CODE (t1) != TREE_CODE (t2))
2558 switch (TREE_CODE (t1))
2561 /* Integer constants are the same only if the same width of type. */
2562 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2564 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2566 return tree_int_cst_equal (t1, t2);
2569 /* Real constants are the same only if the same width of type. */
2570 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2573 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
2576 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2579 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
2580 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
2581 TREE_STRING_LENGTH (t1)));
2584 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
2585 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
2589 VEC(constructor_elt, gc) *v1, *v2;
2590 unsigned HOST_WIDE_INT idx;
2592 typecode = TREE_CODE (TREE_TYPE (t1));
2593 if (typecode != TREE_CODE (TREE_TYPE (t2)))
2596 if (typecode == ARRAY_TYPE)
2598 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
2599 /* For arrays, check that the sizes all match. */
2600 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
2602 || size_1 != int_size_in_bytes (TREE_TYPE (t2)))
2607 /* For record and union constructors, require exact type
2609 if (TREE_TYPE (t1) != TREE_TYPE (t2))
2613 v1 = CONSTRUCTOR_ELTS (t1);
2614 v2 = CONSTRUCTOR_ELTS (t2);
2615 if (VEC_length (constructor_elt, v1)
2616 != VEC_length (constructor_elt, v2))
2619 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
2621 constructor_elt *c1 = VEC_index (constructor_elt, v1, idx);
2622 constructor_elt *c2 = VEC_index (constructor_elt, v2, idx);
2624 /* Check that each value is the same... */
2625 if (!compare_constant (c1->value, c2->value))
2627 /* ... and that they apply to the same fields! */
2628 if (typecode == ARRAY_TYPE)
2630 if (!compare_constant (c1->index, c2->index))
2635 if (c1->index != c2->index)
2646 struct addr_const value1, value2;
2648 decode_addr_const (t1, &value1);
2649 decode_addr_const (t2, &value2);
2650 return (value1.offset == value2.offset
2651 && strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
2657 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
2658 && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
2662 case NON_LVALUE_EXPR:
2663 case VIEW_CONVERT_EXPR:
2664 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
2669 nt1 = lang_hooks.expand_constant (t1);
2670 nt2 = lang_hooks.expand_constant (t2);
2671 if (nt1 != t1 || nt2 != t2)
2672 return compare_constant (nt1, nt2);
2681 /* Make a copy of the whole tree structure for a constant. This
2682 handles the same types of nodes that compare_constant handles. */
2685 copy_constant (tree exp)
2687 switch (TREE_CODE (exp))
2690 /* For ADDR_EXPR, we do not want to copy the decl whose address
2691 is requested. We do want to copy constants though. */
2692 if (CONSTANT_CLASS_P (TREE_OPERAND (exp, 0)))
2693 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2694 copy_constant (TREE_OPERAND (exp, 0)));
2696 return copy_node (exp);
2701 return copy_node (exp);
2704 return build_complex (TREE_TYPE (exp),
2705 copy_constant (TREE_REALPART (exp)),
2706 copy_constant (TREE_IMAGPART (exp)));
2710 return build2 (TREE_CODE (exp), TREE_TYPE (exp),
2711 copy_constant (TREE_OPERAND (exp, 0)),
2712 copy_constant (TREE_OPERAND (exp, 1)));
2716 case NON_LVALUE_EXPR:
2717 case VIEW_CONVERT_EXPR:
2718 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2719 copy_constant (TREE_OPERAND (exp, 0)));
2723 tree copy = copy_node (exp);
2724 VEC(constructor_elt, gc) *v;
2725 unsigned HOST_WIDE_INT idx;
2726 tree purpose, value;
2728 v = VEC_alloc(constructor_elt, gc, VEC_length(constructor_elt,
2729 CONSTRUCTOR_ELTS (exp)));
2730 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, purpose, value)
2732 constructor_elt *ce = VEC_quick_push (constructor_elt, v, NULL);
2733 ce->index = purpose;
2734 ce->value = copy_constant (value);
2736 CONSTRUCTOR_ELTS (copy) = v;
2742 tree t = lang_hooks.expand_constant (exp);
2744 gcc_assert (t != exp);
2745 return copy_constant (t);
2750 /* Return the alignment of constant EXP in bits. */
2753 get_constant_alignment (tree exp)
2757 align = TYPE_ALIGN (TREE_TYPE (exp));
2758 #ifdef CONSTANT_ALIGNMENT
2759 align = CONSTANT_ALIGNMENT (exp, align);
2764 /* Return the section into which constant EXP should be placed. */
2767 get_constant_section (tree exp)
2769 if (IN_NAMED_SECTION (exp))
2770 return get_named_section (exp, NULL, compute_reloc_for_constant (exp));
2772 return targetm.asm_out.select_section (exp,
2773 compute_reloc_for_constant (exp),
2774 get_constant_alignment (exp));
2777 /* Return the size of constant EXP in bytes. */
2779 static HOST_WIDE_INT
2780 get_constant_size (tree exp)
2784 size = int_size_in_bytes (TREE_TYPE (exp));
2785 if (TREE_CODE (exp) == STRING_CST)
2786 size = MAX (TREE_STRING_LENGTH (exp), size);
2790 /* Subroutine of output_constant_def:
2791 No constant equal to EXP is known to have been output.
2792 Make a constant descriptor to enter EXP in the hash table.
2793 Assign the label number and construct RTL to refer to the
2794 constant's location in memory.
2795 Caller is responsible for updating the hash table. */
2797 static struct constant_descriptor_tree *
2798 build_constant_desc (tree exp)
2804 struct constant_descriptor_tree *desc;
2806 desc = ggc_alloc (sizeof (*desc));
2807 desc->value = copy_constant (exp);
2809 /* Propagate marked-ness to copied constant. */
2810 if (flag_mudflap && mf_marked_p (exp))
2811 mf_mark (desc->value);
2813 /* Create a string containing the label name, in LABEL. */
2814 labelno = const_labelno++;
2815 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
2817 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
2818 if (use_object_blocks_p ())
2820 section *sect = get_constant_section (exp);
2821 symbol = create_block_symbol (ggc_strdup (label),
2822 get_block_for_section (sect), -1);
2825 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
2826 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
2827 SET_SYMBOL_REF_DECL (symbol, desc->value);
2828 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
2830 rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), symbol);
2831 set_mem_attributes (rtl, exp, 1);
2832 set_mem_alias_set (rtl, 0);
2833 set_mem_alias_set (rtl, const_alias_set);
2835 /* Set flags or add text to the name to record information, such as
2836 that it is a local symbol. If the name is changed, the macro
2837 ASM_OUTPUT_LABELREF will have to know how to strip this
2838 information. This call might invalidate our local variable
2839 SYMBOL; we can't use it afterward. */
2841 targetm.encode_section_info (exp, rtl, true);
2848 /* Return an rtx representing a reference to constant data in memory
2849 for the constant expression EXP.
2851 If assembler code for such a constant has already been output,
2852 return an rtx to refer to it.
2853 Otherwise, output such a constant in memory
2854 and generate an rtx for it.
2856 If DEFER is nonzero, this constant can be deferred and output only
2857 if referenced in the function after all optimizations.
2859 `const_desc_table' records which constants already have label strings. */
2862 output_constant_def (tree exp, int defer)
2864 struct constant_descriptor_tree *desc;
2865 struct constant_descriptor_tree key;
2868 /* Look up EXP in the table of constant descriptors. If we didn't find
2869 it, create a new one. */
2871 key.hash = const_hash_1 (exp);
2872 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
2877 desc = build_constant_desc (exp);
2878 desc->hash = key.hash;
2882 maybe_output_constant_def_contents (desc, defer);
2886 /* Subroutine of output_constant_def: Decide whether or not we need to
2887 output the constant DESC now, and if so, do it. */
2889 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
2892 rtx symbol = XEXP (desc->rtl, 0);
2893 tree exp = desc->value;
2895 if (flag_syntax_only)
2898 if (TREE_ASM_WRITTEN (exp))
2899 /* Already output; don't do it again. */
2902 /* We can always defer constants as long as the context allows
2906 /* Increment n_deferred_constants if it exists. It needs to be at
2907 least as large as the number of constants actually referred to
2908 by the function. If it's too small we'll stop looking too early
2909 and fail to emit constants; if it's too large we'll only look
2910 through the entire function when we could have stopped earlier. */
2912 n_deferred_constants++;
2916 output_constant_def_contents (symbol);
2919 /* Subroutine of output_constant_def_contents. Output the definition
2920 of constant EXP, which is pointed to by label LABEL. ALIGN is the
2921 constant's alignment in bits. */
2924 assemble_constant_contents (tree exp, const char *label, unsigned int align)
2928 size = get_constant_size (exp);
2930 /* Do any machine/system dependent processing of the constant. */
2931 #ifdef ASM_DECLARE_CONSTANT_NAME
2932 ASM_DECLARE_CONSTANT_NAME (asm_out_file, label, exp, size);
2934 /* Standard thing is just output label for the constant. */
2935 ASM_OUTPUT_LABEL (asm_out_file, label);
2936 #endif /* ASM_DECLARE_CONSTANT_NAME */
2938 /* Output the value of EXP. */
2939 output_constant (exp, size, align);
2942 /* We must output the constant data referred to by SYMBOL; do so. */
2945 output_constant_def_contents (rtx symbol)
2947 tree exp = SYMBOL_REF_DECL (symbol);
2950 /* Make sure any other constants whose addresses appear in EXP
2951 are assigned label numbers. */
2952 output_addressed_constants (exp);
2954 /* We are no longer deferring this constant. */
2955 TREE_ASM_WRITTEN (exp) = 1;
2957 /* If the constant is part of an object block, make sure that the
2958 decl has been positioned within its block, but do not write out
2959 its definition yet. output_object_blocks will do that later. */
2960 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
2961 place_block_symbol (symbol);
2964 switch_to_section (get_constant_section (exp));
2965 align = get_constant_alignment (exp);
2966 if (align > BITS_PER_UNIT)
2967 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
2968 assemble_constant_contents (exp, XSTR (symbol, 0), align);
2971 mudflap_enqueue_constant (exp);
2974 /* Look up EXP in the table of constant descriptors. Return the rtl
2975 if it has been emitted, else null. */
2978 lookup_constant_def (tree exp)
2980 struct constant_descriptor_tree *desc;
2981 struct constant_descriptor_tree key;
2984 key.hash = const_hash_1 (exp);
2985 desc = htab_find_with_hash (const_desc_htab, &key, key.hash);
2987 return (desc ? desc->rtl : NULL_RTX);
2990 /* Used in the hash tables to avoid outputting the same constant
2991 twice. Unlike 'struct constant_descriptor_tree', RTX constants
2992 are output once per function, not once per file. */
2993 /* ??? Only a few targets need per-function constant pools. Most
2994 can use one per-file pool. Should add a targetm bit to tell the
2997 struct rtx_constant_pool GTY(())
2999 /* Pointers to first and last constant in pool, as ordered by offset. */
3000 struct constant_descriptor_rtx *first;
3001 struct constant_descriptor_rtx *last;
3003 /* Hash facility for making memory-constants from constant rtl-expressions.
3004 It is used on RISC machines where immediate integer arguments and
3005 constant addresses are restricted so that such constants must be stored
3007 htab_t GTY((param_is (struct constant_descriptor_rtx))) const_rtx_htab;
3009 /* Current offset in constant pool (does not include any
3010 machine-specific header). */
3011 HOST_WIDE_INT offset;
3014 struct constant_descriptor_rtx GTY((chain_next ("%h.next")))
3016 struct constant_descriptor_rtx *next;
3020 HOST_WIDE_INT offset;
3022 enum machine_mode mode;
3028 /* Hash and compare functions for const_rtx_htab. */
3031 const_desc_rtx_hash (const void *ptr)
3033 const struct constant_descriptor_rtx *desc = ptr;
3038 const_desc_rtx_eq (const void *a, const void *b)
3040 const struct constant_descriptor_rtx *x = a;
3041 const struct constant_descriptor_rtx *y = b;
3043 if (x->mode != y->mode)
3045 return rtx_equal_p (x->constant, y->constant);
3048 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3051 const_rtx_hash_1 (rtx *xp, void *data)
3053 unsigned HOST_WIDE_INT hwi;
3054 enum machine_mode mode;
3060 code = GET_CODE (x);
3061 mode = GET_MODE (x);
3062 h = (hashval_t) code * 1048573 + mode;
3070 const int shift = sizeof (hashval_t) * CHAR_BIT;
3071 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3074 h ^= (hashval_t) hwi;
3075 for (i = 1; i < n; ++i)
3078 h ^= (hashval_t) hwi;
3084 if (mode == VOIDmode)
3086 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3090 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3096 for (i = XVECLEN (x, 0); i-- > 0; )
3097 h = h * 251 + const_rtx_hash_1 (&XVECEXP (x, 0, i), data);
3102 h ^= htab_hash_string (XSTR (x, 0));
3106 h = h * 251 + CODE_LABEL_NUMBER (XEXP (x, 0));
3110 case UNSPEC_VOLATILE:
3111 h = h * 251 + XINT (x, 1);
3119 *hp = *hp * 509 + h;
3123 /* Compute a hash value for X, which should be a constant. */
3126 const_rtx_hash (rtx x)
3129 for_each_rtx (&x, const_rtx_hash_1, &h);
3134 /* Create and return a new rtx constant pool. */
3136 static struct rtx_constant_pool *
3137 create_constant_pool (void)
3139 struct rtx_constant_pool *pool;
3141 pool = ggc_alloc (sizeof (struct rtx_constant_pool));
3142 pool->const_rtx_htab = htab_create_ggc (31, const_desc_rtx_hash,
3143 const_desc_rtx_eq, NULL);
3150 /* Initialize constant pool hashing for a new function. */
3153 init_varasm_status (struct function *f)
3155 struct varasm_status *p;
3157 p = ggc_alloc (sizeof (struct varasm_status));
3160 p->pool = create_constant_pool ();
3161 p->deferred_constants = 0;
3164 /* Given a MINUS expression, simplify it if both sides
3165 include the same symbol. */
3168 simplify_subtraction (rtx x)
3170 rtx r = simplify_rtx (x);
3174 /* Given a constant rtx X, make (or find) a memory constant for its value
3175 and return a MEM rtx to refer to it in memory. */
3178 force_const_mem (enum machine_mode mode, rtx x)
3180 struct constant_descriptor_rtx *desc, tmp;
3181 struct rtx_constant_pool *pool;
3188 /* If we're not allowed to drop X into the constant pool, don't. */
3189 if (targetm.cannot_force_const_mem (x))
3192 /* Record that this function has used a constant pool entry. */
3193 current_function_uses_const_pool = 1;
3195 /* Decide which pool to use. */
3196 pool = (targetm.use_blocks_for_constant_p (mode, x)
3197 ? shared_constant_pool
3198 : cfun->varasm->pool);
3200 /* Lookup the value in the hashtable. */
3203 hash = const_rtx_hash (x);
3204 slot = htab_find_slot_with_hash (pool->const_rtx_htab, &tmp, hash, INSERT);
3207 /* If the constant was already present, return its memory. */
3209 return copy_rtx (desc->mem);
3211 /* Otherwise, create a new descriptor. */
3212 desc = ggc_alloc (sizeof (*desc));
3215 /* Align the location counter as required by EXP's data type. */
3216 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3217 #ifdef CONSTANT_ALIGNMENT
3219 tree type = lang_hooks.types.type_for_mode (mode, 0);
3220 if (type != NULL_TREE)
3221 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3225 pool->offset += (align / BITS_PER_UNIT) - 1;
3226 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3229 desc->constant = tmp.constant;
3230 desc->offset = pool->offset;
3233 desc->align = align;
3234 desc->labelno = const_labelno;
3237 pool->offset += GET_MODE_SIZE (mode);
3239 pool->last->next = desc;
3241 pool->first = pool->last = desc;
3244 /* Create a string containing the label name, in LABEL. */
3245 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3248 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3249 the constants pool. */
3250 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3252 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3253 symbol = create_block_symbol (ggc_strdup (label),
3254 get_block_for_section (sect), -1);
3257 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3259 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3260 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3261 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3263 /* Construct the MEM. */
3264 desc->mem = def = gen_const_mem (mode, symbol);
3265 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3266 set_mem_align (def, align);
3268 /* If we're dropping a label to the constant pool, make sure we
3270 if (GET_CODE (x) == LABEL_REF)
3271 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3273 return copy_rtx (def);
3276 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3279 get_pool_constant (rtx addr)
3281 return SYMBOL_REF_CONSTANT (addr)->constant;
3284 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3285 and whether it has been output or not. */
3288 get_pool_constant_mark (rtx addr, bool *pmarked)
3290 struct constant_descriptor_rtx *desc;
3292 desc = SYMBOL_REF_CONSTANT (addr);
3293 *pmarked = (desc->mark != 0);
3294 return desc->constant;
3297 /* Similar, return the mode. */
3300 get_pool_mode (rtx addr)
3302 return SYMBOL_REF_CONSTANT (addr)->mode;
3305 /* Return the size of the constant pool. */
3308 get_pool_size (void)
3310 return cfun->varasm->pool->offset;
3313 /* Worker function for output_constant_pool_1. Emit assembly for X
3314 in MODE with known alignment ALIGN. */
3317 output_constant_pool_2 (enum machine_mode mode, rtx x, unsigned int align)
3319 switch (GET_MODE_CLASS (mode))
3322 case MODE_DECIMAL_FLOAT:
3326 gcc_assert (GET_CODE (x) == CONST_DOUBLE);
3327 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
3328 assemble_real (r, mode, align);
3333 case MODE_PARTIAL_INT:
3334 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3337 case MODE_VECTOR_FLOAT:
3338 case MODE_VECTOR_INT:
3341 enum machine_mode submode = GET_MODE_INNER (mode);
3342 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3344 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3345 units = CONST_VECTOR_NUNITS (x);
3347 for (i = 0; i < units; i++)
3349 rtx elt = CONST_VECTOR_ELT (x, i);
3350 output_constant_pool_2 (submode, elt, i ? subalign : align);
3360 /* Worker function for output_constant_pool. Emit constant DESC,
3361 giving it ALIGN bits of alignment. */
3364 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3371 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3372 whose CODE_LABEL has been deleted. This can occur if a jump table
3373 is eliminated by optimization. If so, write a constant of zero
3374 instead. Note that this can also happen by turning the
3375 CODE_LABEL into a NOTE. */
3376 /* ??? This seems completely and utterly wrong. Certainly it's
3377 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3378 functioning even with INSN_DELETED_P and friends. */
3381 switch (GET_CODE (x))
3384 if (GET_CODE (XEXP (x, 0)) != PLUS
3385 || GET_CODE (XEXP (XEXP (x, 0), 0)) != LABEL_REF)
3387 tmp = XEXP (XEXP (x, 0), 0);
3392 gcc_assert (!INSN_DELETED_P (tmp));
3393 gcc_assert (!NOTE_P (tmp)
3394 || NOTE_LINE_NUMBER (tmp) != NOTE_INSN_DELETED);
3401 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3402 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3403 align, desc->labelno, done);
3406 assemble_align (align);
3408 /* Output the label. */
3409 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3411 /* Output the data. */
3412 output_constant_pool_2 (desc->mode, x, align);
3414 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3415 sections have proper size. */
3416 if (align > GET_MODE_BITSIZE (desc->mode)
3418 && (in_section->common.flags & SECTION_MERGE))
3419 assemble_align (align);
3421 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3427 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3428 to as used. Emit referenced deferred strings. This function can
3429 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3432 mark_constant (rtx *current_rtx, void *data ATTRIBUTE_UNUSED)
3434 rtx x = *current_rtx;
3436 if (x == NULL_RTX || GET_CODE (x) != SYMBOL_REF)
3439 if (CONSTANT_POOL_ADDRESS_P (x))
3441 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3442 if (desc->mark == 0)
3445 for_each_rtx (&desc->constant, mark_constant, NULL);
3448 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3450 tree exp = SYMBOL_REF_DECL (x);
3451 if (!TREE_ASM_WRITTEN (exp))
3453 n_deferred_constants--;
3454 output_constant_def_contents (x);
3461 /* Look through appropriate parts of INSN, marking all entries in the
3462 constant pool which are actually being used. Entries that are only
3463 referenced by other constants are also marked as used. Emit
3464 deferred strings that are used. */
3467 mark_constants (rtx insn)
3472 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3473 insns, not any notes that may be attached. We don't want to mark
3474 a constant just because it happens to appear in a REG_EQUIV note. */
3475 if (GET_CODE (PATTERN (insn)) == SEQUENCE)
3477 rtx seq = PATTERN (insn);
3478 int i, n = XVECLEN (seq, 0);
3479 for (i = 0; i < n; ++i)
3481 rtx subinsn = XVECEXP (seq, 0, i);
3482 if (INSN_P (subinsn))
3483 for_each_rtx (&PATTERN (subinsn), mark_constant, NULL);
3487 for_each_rtx (&PATTERN (insn), mark_constant, NULL);
3490 /* Look through the instructions for this function, and mark all the
3491 entries in POOL which are actually being used. Emit deferred constants
3492 which have indeed been used. */
3495 mark_constant_pool (void)
3499 if (!current_function_uses_const_pool && n_deferred_constants == 0)
3502 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3503 mark_constants (insn);
3505 for (link = current_function_epilogue_delay_list;
3507 link = XEXP (link, 1))
3508 mark_constants (XEXP (link, 0));
3511 /* Write all the constants in POOL. */
3514 output_constant_pool_contents (struct rtx_constant_pool *pool)
3516 struct constant_descriptor_rtx *desc;
3518 for (desc = pool->first; desc ; desc = desc->next)
3521 /* If the constant is part of an object_block, make sure that
3522 the constant has been positioned within its block, but do not
3523 write out its definition yet. output_object_blocks will do
3525 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc->sym)
3526 && SYMBOL_REF_BLOCK (desc->sym))
3527 place_block_symbol (desc->sym);
3530 switch_to_section (targetm.asm_out.select_rtx_section
3531 (desc->mode, desc->constant, desc->align));
3532 output_constant_pool_1 (desc, desc->align);
3537 /* Mark all constants that are used in the current function, then write
3538 out the function's private constant pool. */
3541 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
3542 tree fndecl ATTRIBUTE_UNUSED)
3544 struct rtx_constant_pool *pool = cfun->varasm->pool;
3546 /* It is possible for gcc to call force_const_mem and then to later
3547 discard the instructions which refer to the constant. In such a
3548 case we do not need to output the constant. */
3549 mark_constant_pool ();
3551 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3552 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
3555 output_constant_pool_contents (pool);
3557 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3558 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
3562 /* Write the contents of the shared constant pool. */
3565 output_shared_constant_pool (void)
3567 output_constant_pool_contents (shared_constant_pool);
3570 /* Determine what kind of relocations EXP may need. */
3573 compute_reloc_for_constant (tree exp)
3575 int reloc = 0, reloc2;
3578 /* Give the front-end a chance to convert VALUE to something that
3579 looks more like a constant to the back-end. */
3580 exp = lang_hooks.expand_constant (exp);
3582 switch (TREE_CODE (exp))
3586 /* Go inside any operations that get_inner_reference can handle and see
3587 if what's inside is a constant: no need to do anything here for
3588 addresses of variables or functions. */
3589 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3590 tem = TREE_OPERAND (tem, 0))
3593 if (TREE_PUBLIC (tem))
3600 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3601 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3605 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3606 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3607 /* The difference of two local labels is computable at link time. */
3608 if (reloc == 1 && reloc2 == 1)
3616 case NON_LVALUE_EXPR:
3617 case VIEW_CONVERT_EXPR:
3618 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3623 unsigned HOST_WIDE_INT idx;
3624 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3626 reloc |= compute_reloc_for_constant (tem);
3636 /* Find all the constants whose addresses are referenced inside of EXP,
3637 and make sure assembler code with a label has been output for each one.
3638 Indicate whether an ADDR_EXPR has been encountered. */
3641 output_addressed_constants (tree exp)
3645 /* Give the front-end a chance to convert VALUE to something that
3646 looks more like a constant to the back-end. */
3647 exp = lang_hooks.expand_constant (exp);
3649 switch (TREE_CODE (exp))
3653 /* Go inside any operations that get_inner_reference can handle and see
3654 if what's inside is a constant: no need to do anything here for
3655 addresses of variables or functions. */
3656 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3657 tem = TREE_OPERAND (tem, 0))
3660 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3661 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
3662 tem = DECL_INITIAL (tem);
3664 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
3665 output_constant_def (tem, 0);
3670 output_addressed_constants (TREE_OPERAND (exp, 1));
3675 case NON_LVALUE_EXPR:
3676 case VIEW_CONVERT_EXPR:
3677 output_addressed_constants (TREE_OPERAND (exp, 0));
3682 unsigned HOST_WIDE_INT idx;
3683 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3685 output_addressed_constants (tem);
3694 /* Whether a constructor CTOR is a valid static constant initializer if all
3695 its elements are. This used to be internal to initializer_constant_valid_p
3696 and has been exposed to let other functions like categorize_ctor_elements
3697 evaluate the property while walking a constructor for other purposes. */
3700 constructor_static_from_elts_p (tree ctor)
3702 return (TREE_CONSTANT (ctor)
3703 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
3704 || TREE_CODE (TREE_TYPE (ctor)) == RECORD_TYPE)
3705 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (ctor)));
3708 /* Return nonzero if VALUE is a valid constant-valued expression
3709 for use in initializing a static variable; one that can be an
3710 element of a "constant" initializer.
3712 Return null_pointer_node if the value is absolute;
3713 if it is relocatable, return the variable that determines the relocation.
3714 We assume that VALUE has been folded as much as possible;
3715 therefore, we do not need to check for such things as
3716 arithmetic-combinations of integers. */
3719 initializer_constant_valid_p (tree value, tree endtype)
3721 /* Give the front-end a chance to convert VALUE to something that
3722 looks more like a constant to the back-end. */
3723 value = lang_hooks.expand_constant (value);
3725 switch (TREE_CODE (value))
3728 if (constructor_static_from_elts_p (value))
3730 unsigned HOST_WIDE_INT idx;
3732 bool absolute = true;
3734 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
3737 reloc = initializer_constant_valid_p (elt, TREE_TYPE (elt));
3740 if (reloc != null_pointer_node)
3743 /* For a non-absolute relocation, there is no single
3744 variable that can be "the variable that determines the
3746 return absolute ? null_pointer_node : error_mark_node;
3749 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
3756 return null_pointer_node;
3760 value = staticp (TREE_OPERAND (value, 0));
3763 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out to
3764 be a constant, this is old-skool offsetof-like nonsense. */
3765 if (TREE_CODE (value) == INDIRECT_REF
3766 && TREE_CONSTANT (TREE_OPERAND (value, 0)))
3767 return null_pointer_node;
3768 /* Taking the address of a nested function involves a trampoline. */
3769 if (TREE_CODE (value) == FUNCTION_DECL
3770 && ((decl_function_context (value)
3771 && !DECL_NO_STATIC_CHAIN (value))
3772 || DECL_DLLIMPORT_P (value)))
3774 /* "&{...}" requires a temporary to hold the constructed
3776 if (TREE_CODE (value) == CONSTRUCTOR)
3781 case VIEW_CONVERT_EXPR:
3782 case NON_LVALUE_EXPR:
3783 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
3792 src = TREE_OPERAND (value, 0);
3793 src_type = TREE_TYPE (src);
3794 dest_type = TREE_TYPE (value);
3796 /* Allow conversions between pointer types, floating-point
3797 types, and offset types. */
3798 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
3799 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
3800 || (TREE_CODE (dest_type) == OFFSET_TYPE
3801 && TREE_CODE (src_type) == OFFSET_TYPE))
3802 return initializer_constant_valid_p (src, endtype);
3804 /* Allow length-preserving conversions between integer types. */
3805 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
3806 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
3807 return initializer_constant_valid_p (src, endtype);
3809 /* Allow conversions between other integer types only if
3811 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
3813 tree inner = initializer_constant_valid_p (src, endtype);
3814 if (inner == null_pointer_node)
3815 return null_pointer_node;
3819 /* Allow (int) &foo provided int is as wide as a pointer. */
3820 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
3821 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
3822 return initializer_constant_valid_p (src, endtype);
3824 /* Likewise conversions from int to pointers, but also allow
3825 conversions from 0. */
3826 if ((POINTER_TYPE_P (dest_type)
3827 || TREE_CODE (dest_type) == OFFSET_TYPE)
3828 && INTEGRAL_TYPE_P (src_type))
3830 if (TREE_CODE (src) == INTEGER_CST
3831 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
3832 return null_pointer_node;
3833 if (integer_zerop (src))
3834 return null_pointer_node;
3835 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
3836 return initializer_constant_valid_p (src, endtype);
3839 /* Allow conversions to struct or union types if the value
3841 if (TREE_CODE (dest_type) == RECORD_TYPE
3842 || TREE_CODE (dest_type) == UNION_TYPE)
3843 return initializer_constant_valid_p (src, endtype);
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 /* If either term is absolute, use the other terms relocation. */
3856 if (valid0 == null_pointer_node)
3858 if (valid1 == null_pointer_node)
3864 if (! INTEGRAL_TYPE_P (endtype)
3865 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
3867 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
3869 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
3871 /* Win if second argument is absolute. */
3872 if (valid1 == null_pointer_node)
3874 /* Win if both arguments have the same relocation.
3875 Then the value is absolute. */
3876 if (valid0 == valid1 && valid0 != 0)
3877 return null_pointer_node;
3879 /* Since GCC guarantees that string constants are unique in the
3880 generated code, a subtraction between two copies of the same
3881 constant string is absolute. */
3882 if (valid0 && TREE_CODE (valid0) == STRING_CST
3883 && valid1 && TREE_CODE (valid1) == STRING_CST
3884 && operand_equal_p (valid0, valid1, 1))
3885 return null_pointer_node;
3888 /* Support narrowing differences. */
3889 if (INTEGRAL_TYPE_P (endtype))
3893 op0 = TREE_OPERAND (value, 0);
3894 op1 = TREE_OPERAND (value, 1);
3896 /* Like STRIP_NOPS except allow the operand mode to widen.
3897 This works around a feature of fold that simplifies
3898 (int)(p1 - p2) to ((int)p1 - (int)p2) under the theory
3899 that the narrower operation is cheaper. */
3901 while (TREE_CODE (op0) == NOP_EXPR
3902 || TREE_CODE (op0) == CONVERT_EXPR
3903 || TREE_CODE (op0) == NON_LVALUE_EXPR)
3905 tree inner = TREE_OPERAND (op0, 0);
3906 if (inner == error_mark_node
3907 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
3908 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
3909 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
3914 while (TREE_CODE (op1) == NOP_EXPR
3915 || TREE_CODE (op1) == CONVERT_EXPR
3916 || TREE_CODE (op1) == NON_LVALUE_EXPR)
3918 tree inner = TREE_OPERAND (op1, 0);
3919 if (inner == error_mark_node
3920 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
3921 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
3922 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
3927 op0 = initializer_constant_valid_p (op0, endtype);
3928 op1 = initializer_constant_valid_p (op1, endtype);
3930 /* Both initializers must be known. */
3934 return null_pointer_node;
3936 /* Support differences between labels. */
3937 if (TREE_CODE (op0) == LABEL_DECL
3938 && TREE_CODE (op1) == LABEL_DECL)
3939 return null_pointer_node;
3941 if (TREE_CODE (op0) == STRING_CST
3942 && TREE_CODE (op1) == STRING_CST
3943 && operand_equal_p (op0, op1, 1))
3944 return null_pointer_node;
3956 /* Output assembler code for constant EXP to FILE, with no label.
3957 This includes the pseudo-op such as ".int" or ".byte", and a newline.
3958 Assumes output_addressed_constants has been done on EXP already.
3960 Generate exactly SIZE bytes of assembler data, padding at the end
3961 with zeros if necessary. SIZE must always be specified.
3963 SIZE is important for structure constructors,
3964 since trailing members may have been omitted from the constructor.
3965 It is also important for initialization of arrays from string constants
3966 since the full length of the string constant might not be wanted.
3967 It is also needed for initialization of unions, where the initializer's
3968 type is just one member, and that may not be as long as the union.
3970 There a case in which we would fail to output exactly SIZE bytes:
3971 for a structure constructor that wants to produce more than SIZE bytes.
3972 But such constructors will never be generated for any possible input.
3974 ALIGN is the alignment of the data in bits. */
3977 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
3979 enum tree_code code;
3980 unsigned HOST_WIDE_INT thissize;
3982 /* Some front-ends use constants other than the standard language-independent
3983 varieties, but which may still be output directly. Give the front-end a
3984 chance to convert EXP to a language-independent representation. */
3985 exp = lang_hooks.expand_constant (exp);
3987 if (size == 0 || flag_syntax_only)
3990 /* See if we're trying to initialize a pointer in a non-default mode
3991 to the address of some declaration somewhere. If the target says
3992 the mode is valid for pointers, assume the target has a way of
3994 if (TREE_CODE (exp) == NOP_EXPR
3995 && POINTER_TYPE_P (TREE_TYPE (exp))
3996 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
3998 tree saved_type = TREE_TYPE (exp);
4000 /* Peel off any intermediate conversions-to-pointer for valid
4002 while (TREE_CODE (exp) == NOP_EXPR
4003 && POINTER_TYPE_P (TREE_TYPE (exp))
4004 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
4005 exp = TREE_OPERAND (exp, 0);
4007 /* If what we're left with is the address of something, we can
4008 convert the address to the final type and output it that
4010 if (TREE_CODE (exp) == ADDR_EXPR)
4011 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
4012 /* Likewise for constant ints. */
4013 else if (TREE_CODE (exp) == INTEGER_CST)
4014 exp = build_int_cst_wide (saved_type, TREE_INT_CST_LOW (exp),
4015 TREE_INT_CST_HIGH (exp));
4019 /* Eliminate any conversions since we'll be outputting the underlying
4021 while (TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
4022 || TREE_CODE (exp) == NON_LVALUE_EXPR
4023 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
4025 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
4026 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
4028 /* Make sure eliminating the conversion is really a no-op, except with
4029 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4030 union types to allow for Ada unchecked unions. */
4031 if (type_size > op_size
4032 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
4033 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
4034 /* Keep the conversion. */
4037 exp = TREE_OPERAND (exp, 0);
4040 code = TREE_CODE (TREE_TYPE (exp));
4041 thissize = int_size_in_bytes (TREE_TYPE (exp));
4043 /* Give the front end another chance to expand constants. */
4044 exp = lang_hooks.expand_constant (exp);
4046 /* Allow a constructor with no elements for any data type.
4047 This means to fill the space with zeros. */
4048 if (TREE_CODE (exp) == CONSTRUCTOR
4049 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (exp)))
4051 assemble_zeros (size);
4055 if (TREE_CODE (exp) == FDESC_EXPR)
4057 #ifdef ASM_OUTPUT_FDESC
4058 HOST_WIDE_INT part = tree_low_cst (TREE_OPERAND (exp, 1), 0);
4059 tree decl = TREE_OPERAND (exp, 0);
4060 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4067 /* Now output the underlying data. If we've handling the padding, return.
4068 Otherwise, break and ensure SIZE is the size written. */
4075 case REFERENCE_TYPE:
4077 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
4078 EXPAND_INITIALIZER),
4079 MIN (size, thissize), align, 0))
4080 error ("initializer for integer value is too complicated");
4084 if (TREE_CODE (exp) != REAL_CST)
4085 error ("initializer for floating value is not a floating constant");
4087 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)), align);
4091 output_constant (TREE_REALPART (exp), thissize / 2, align);
4092 output_constant (TREE_IMAGPART (exp), thissize / 2,
4093 min_align (align, BITS_PER_UNIT * (thissize / 2)));
4098 switch (TREE_CODE (exp))
4101 output_constructor (exp, size, align);
4104 thissize = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp),
4106 assemble_string (TREE_STRING_POINTER (exp), thissize);
4113 unsigned int nalign;
4114 enum machine_mode inner;
4116 inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4117 nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4119 elt_size = GET_MODE_SIZE (inner);
4121 link = TREE_VECTOR_CST_ELTS (exp);
4122 output_constant (TREE_VALUE (link), elt_size, align);
4123 thissize = elt_size;
4124 while ((link = TREE_CHAIN (link)) != NULL)
4126 output_constant (TREE_VALUE (link), elt_size, nalign);
4127 thissize += elt_size;
4138 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4139 output_constructor (exp, size, align);
4149 if (size > thissize)
4150 assemble_zeros (size - thissize);
4154 /* Subroutine of output_constructor, used for computing the size of
4155 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4156 type with an unspecified upper bound. */
4158 static unsigned HOST_WIDE_INT
4159 array_size_for_constructor (tree val)
4162 unsigned HOST_WIDE_INT cnt;
4163 tree index, value, tmp;
4165 /* This code used to attempt to handle string constants that are not
4166 arrays of single-bytes, but nothing else does, so there's no point in
4168 if (TREE_CODE (val) == STRING_CST)
4169 return TREE_STRING_LENGTH (val);
4171 max_index = NULL_TREE;
4172 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4174 if (TREE_CODE (index) == RANGE_EXPR)
4175 index = TREE_OPERAND (index, 1);
4176 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4180 if (max_index == NULL_TREE)
4183 /* Compute the total number of array elements. */
4184 tmp = TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)));
4185 i = size_binop (MINUS_EXPR, fold_convert (sizetype, max_index),
4186 fold_convert (sizetype, tmp));
4187 i = size_binop (PLUS_EXPR, i, build_int_cst (sizetype, 1));
4189 /* Multiply by the array element unit size to find number of bytes. */
4190 i = size_binop (MULT_EXPR, i, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4192 return tree_low_cst (i, 1);
4195 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4196 Generate at least SIZE bytes, padding if necessary. */
4199 output_constructor (tree exp, unsigned HOST_WIDE_INT size,
4202 tree type = TREE_TYPE (exp);
4205 /* Number of bytes output or skipped so far.
4206 In other words, current position within the constructor. */
4207 HOST_WIDE_INT total_bytes = 0;
4208 /* Nonzero means BYTE contains part of a byte, to be output. */
4209 int byte_buffer_in_use = 0;
4211 unsigned HOST_WIDE_INT cnt;
4212 constructor_elt *ce;
4214 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
4216 if (TREE_CODE (type) == RECORD_TYPE)
4217 field = TYPE_FIELDS (type);
4219 if (TREE_CODE (type) == ARRAY_TYPE
4220 && TYPE_DOMAIN (type) != 0)
4221 min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (type));
4223 /* As LINK goes through the elements of the constant,
4224 FIELD goes through the structure fields, if the constant is a structure.
4225 if the constant is a union, then we override this,
4226 by getting the field from the TREE_LIST element.
4227 But the constant could also be an array. Then FIELD is zero.
4229 There is always a maximum of one element in the chain LINK for unions
4230 (even if the initializer in a source program incorrectly contains
4233 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), cnt, ce);
4234 cnt++, field = field ? TREE_CHAIN (field) : 0)
4236 tree val = ce->value;
4239 /* The element in a union constructor specifies the proper field
4241 if ((TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
4242 || TREE_CODE (type) == QUAL_UNION_TYPE)
4246 else if (TREE_CODE (type) == ARRAY_TYPE)
4249 #ifdef ASM_COMMENT_START
4250 if (field && flag_verbose_asm)
4251 fprintf (asm_out_file, "%s %s:\n",
4254 ? IDENTIFIER_POINTER (DECL_NAME (field))
4258 /* Eliminate the marker that makes a cast not be an lvalue. */
4262 if (index && TREE_CODE (index) == RANGE_EXPR)
4264 unsigned HOST_WIDE_INT fieldsize
4265 = int_size_in_bytes (TREE_TYPE (type));
4266 HOST_WIDE_INT lo_index = tree_low_cst (TREE_OPERAND (index, 0), 0);
4267 HOST_WIDE_INT hi_index = tree_low_cst (TREE_OPERAND (index, 1), 0);
4268 HOST_WIDE_INT index;
4269 unsigned int align2 = min_align (align, fieldsize * BITS_PER_UNIT);
4271 for (index = lo_index; index <= hi_index; index++)
4273 /* Output the element's initial value. */
4275 assemble_zeros (fieldsize);
4277 output_constant (val, fieldsize, align2);
4279 /* Count its size. */
4280 total_bytes += fieldsize;
4283 else if (field == 0 || !DECL_BIT_FIELD (field))
4285 /* An element that is not a bit-field. */
4287 unsigned HOST_WIDE_INT fieldsize;
4288 /* Since this structure is static,
4289 we know the positions are constant. */
4290 HOST_WIDE_INT pos = field ? int_byte_position (field) : 0;
4291 unsigned int align2;
4294 pos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val)), 1)
4295 * (tree_low_cst (index, 0) - tree_low_cst (min_index, 0)));
4297 /* Output any buffered-up bit-fields preceding this element. */
4298 if (byte_buffer_in_use)
4300 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4302 byte_buffer_in_use = 0;
4305 /* Advance to offset of this element.
4306 Note no alignment needed in an array, since that is guaranteed
4307 if each element has the proper size. */
4308 if ((field != 0 || index != 0) && pos != total_bytes)
4310 gcc_assert (pos >= total_bytes);
4311 assemble_zeros (pos - total_bytes);
4315 /* Find the alignment of this element. */
4316 align2 = min_align (align, BITS_PER_UNIT * pos);
4318 /* Determine size this element should occupy. */
4323 /* If this is an array with an unspecified upper bound,
4324 the initializer determines the size. */
4325 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4326 but we cannot do this until the deprecated support for
4327 initializing zero-length array members is removed. */
4328 if (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE
4329 && TYPE_DOMAIN (TREE_TYPE (field))
4330 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field))))
4332 fieldsize = array_size_for_constructor (val);
4333 /* Given a non-empty initialization, this field had
4335 gcc_assert (!fieldsize || !TREE_CHAIN (field));
4337 else if (DECL_SIZE_UNIT (field))
4339 /* ??? This can't be right. If the decl size overflows
4340 a host integer we will silently emit no data. */
4341 if (host_integerp (DECL_SIZE_UNIT (field), 1))
4342 fieldsize = tree_low_cst (DECL_SIZE_UNIT (field), 1);
4346 fieldsize = int_size_in_bytes (TREE_TYPE (type));
4348 /* Output the element's initial value. */
4350 assemble_zeros (fieldsize);
4352 output_constant (val, fieldsize, align2);
4354 /* Count its size. */
4355 total_bytes += fieldsize;
4357 else if (val != 0 && TREE_CODE (val) != INTEGER_CST)
4358 error ("invalid initial value for member %qs",
4359 IDENTIFIER_POINTER (DECL_NAME (field)));
4362 /* Element that is a bit-field. */
4364 HOST_WIDE_INT next_offset = int_bit_position (field);
4365 HOST_WIDE_INT end_offset
4366 = (next_offset + tree_low_cst (DECL_SIZE (field), 1));
4369 val = integer_zero_node;
4371 /* If this field does not start in this (or, next) byte,
4373 if (next_offset / BITS_PER_UNIT != total_bytes)
4375 /* Output remnant of any bit field in previous bytes. */
4376 if (byte_buffer_in_use)
4378 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4380 byte_buffer_in_use = 0;
4383 /* If still not at proper byte, advance to there. */
4384 if (next_offset / BITS_PER_UNIT != total_bytes)
4386 gcc_assert (next_offset / BITS_PER_UNIT >= total_bytes);
4387 assemble_zeros (next_offset / BITS_PER_UNIT - total_bytes);
4388 total_bytes = next_offset / BITS_PER_UNIT;
4392 if (! byte_buffer_in_use)
4395 /* We must split the element into pieces that fall within
4396 separate bytes, and combine each byte with previous or
4397 following bit-fields. */
4399 /* next_offset is the offset n fbits from the beginning of
4400 the structure to the next bit of this element to be processed.
4401 end_offset is the offset of the first bit past the end of
4403 while (next_offset < end_offset)
4407 HOST_WIDE_INT value;
4408 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
4409 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
4411 /* Advance from byte to byte
4412 within this element when necessary. */
4413 while (next_byte != total_bytes)
4415 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4420 /* Number of bits we can process at once
4421 (all part of the same byte). */
4422 this_time = MIN (end_offset - next_offset,
4423 BITS_PER_UNIT - next_bit);
4424 if (BYTES_BIG_ENDIAN)
4426 /* On big-endian machine, take the most significant bits
4427 first (of the bits that are significant)
4428 and put them into bytes from the most significant end. */
4429 shift = end_offset - next_offset - this_time;
4431 /* Don't try to take a bunch of bits that cross
4432 the word boundary in the INTEGER_CST. We can
4433 only select bits from the LOW or HIGH part
4435 if (shift < HOST_BITS_PER_WIDE_INT
4436 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4438 this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
4439 shift = HOST_BITS_PER_WIDE_INT;
4442 /* Now get the bits from the appropriate constant word. */
4443 if (shift < HOST_BITS_PER_WIDE_INT)
4444 value = TREE_INT_CST_LOW (val);
4447 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4448 value = TREE_INT_CST_HIGH (val);
4449 shift -= HOST_BITS_PER_WIDE_INT;
4452 /* Get the result. This works only when:
4453 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4454 byte |= (((value >> shift)
4455 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4456 << (BITS_PER_UNIT - this_time - next_bit));
4460 /* On little-endian machines,
4461 take first the least significant bits of the value
4462 and pack them starting at the least significant
4463 bits of the bytes. */
4464 shift = next_offset - int_bit_position (field);
4466 /* Don't try to take a bunch of bits that cross
4467 the word boundary in the INTEGER_CST. We can
4468 only select bits from the LOW or HIGH part
4470 if (shift < HOST_BITS_PER_WIDE_INT
4471 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4472 this_time = (HOST_BITS_PER_WIDE_INT - shift);
4474 /* Now get the bits from the appropriate constant word. */
4475 if (shift < HOST_BITS_PER_WIDE_INT)
4476 value = TREE_INT_CST_LOW (val);
4479 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4480 value = TREE_INT_CST_HIGH (val);
4481 shift -= HOST_BITS_PER_WIDE_INT;
4484 /* Get the result. This works only when:
4485 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4486 byte |= (((value >> shift)
4487 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4491 next_offset += this_time;
4492 byte_buffer_in_use = 1;
4497 if (byte_buffer_in_use)
4499 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4503 if ((unsigned HOST_WIDE_INT)total_bytes < size)
4504 assemble_zeros (size - total_bytes);
4507 /* This TREE_LIST contains any weak symbol declarations waiting
4509 static GTY(()) tree weak_decls;
4511 /* Mark DECL as weak. */
4514 mark_weak (tree decl)
4516 DECL_WEAK (decl) = 1;
4518 if (DECL_RTL_SET_P (decl)
4519 && MEM_P (DECL_RTL (decl))
4520 && XEXP (DECL_RTL (decl), 0)
4521 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
4522 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
4525 /* Merge weak status between NEWDECL and OLDDECL. */
4528 merge_weak (tree newdecl, tree olddecl)
4530 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
4532 if (DECL_WEAK (newdecl) && SUPPORTS_WEAK)
4535 /* We put the NEWDECL on the weak_decls list at some point
4536 and OLDDECL as well. Keep just OLDDECL on the list. */
4537 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
4538 if (TREE_VALUE (*pwd) == newdecl)
4540 *pwd = TREE_CHAIN (*pwd);
4547 if (DECL_WEAK (newdecl))
4551 /* NEWDECL is weak, but OLDDECL is not. */
4553 /* If we already output the OLDDECL, we're in trouble; we can't
4554 go back and make it weak. This error cannot caught in
4555 declare_weak because the NEWDECL and OLDDECL was not yet
4556 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4557 if (TREE_ASM_WRITTEN (olddecl))
4558 error ("weak declaration of %q+D must precede definition",
4561 /* If we've already generated rtl referencing OLDDECL, we may
4562 have done so in a way that will not function properly with
4564 else if (TREE_USED (olddecl)
4565 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)))
4566 warning (0, "weak declaration of %q+D after first use results "
4567 "in unspecified behavior", newdecl);
4571 /* We put the NEWDECL on the weak_decls list at some point.
4572 Replace it with the OLDDECL. */
4573 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
4574 if (TREE_VALUE (wd) == newdecl)
4576 TREE_VALUE (wd) = olddecl;
4579 /* We may not find the entry on the list. If NEWDECL is a
4580 weak alias, then we will have already called
4581 globalize_decl to remove the entry; in that case, we do
4582 not need to do anything. */
4585 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4586 mark_weak (olddecl);
4589 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4590 weak. Just update NEWDECL to indicate that it's weak too. */
4591 mark_weak (newdecl);
4594 /* Declare DECL to be a weak symbol. */
4597 declare_weak (tree decl)
4599 if (! TREE_PUBLIC (decl))
4600 error ("weak declaration of %q+D must be public", decl);
4601 else if (TREE_CODE (decl) == FUNCTION_DECL && TREE_ASM_WRITTEN (decl))
4602 error ("weak declaration of %q+D must precede definition", decl);
4603 else if (SUPPORTS_WEAK)
4605 if (! DECL_WEAK (decl))
4606 weak_decls = tree_cons (NULL, decl, weak_decls);
4609 warning (0, "weak declaration of %q+D not supported", decl);
4615 weak_finish_1 (tree decl)
4617 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
4618 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4621 if (! TREE_USED (decl))
4624 #ifdef ASM_WEAKEN_DECL
4625 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
4627 #ifdef ASM_WEAKEN_LABEL
4628 ASM_WEAKEN_LABEL (asm_out_file, name);
4630 #ifdef ASM_OUTPUT_WEAK_ALIAS
4632 static bool warn_once = 0;
4635 warning (0, "only weak aliases are supported in this configuration");
4645 /* This TREE_LIST contains weakref targets. */
4647 static GTY(()) tree weakref_targets;
4649 /* Forward declaration. */
4650 static tree find_decl_and_mark_needed (tree decl, tree target);
4652 /* Emit any pending weak declarations. */
4659 for (t = weakref_targets; t; t = TREE_CHAIN (t))
4661 tree alias_decl = TREE_PURPOSE (t);
4662 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
4664 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
4665 /* Remove alias_decl from the weak list, but leave entries for
4666 the target alone. */
4668 #ifndef ASM_OUTPUT_WEAKREF
4669 else if (! TREE_SYMBOL_REFERENCED (target))
4671 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
4672 defined, otherwise we and weak_finish_1 would use a
4673 different macros. */
4674 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
4675 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
4677 tree decl = find_decl_and_mark_needed (alias_decl, target);
4681 decl = build_decl (TREE_CODE (alias_decl), target,
4682 TREE_TYPE (alias_decl));
4684 DECL_EXTERNAL (decl) = 1;
4685 TREE_PUBLIC (decl) = 1;
4686 DECL_ARTIFICIAL (decl) = 1;
4687 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
4688 TREE_USED (decl) = 1;
4691 weak_finish_1 (decl);
4700 /* Remove the alias and the target from the pending weak list
4701 so that we do not emit any .weak directives for the former,
4702 nor multiple .weak directives for the latter. */
4703 for (p = &weak_decls; (t2 = *p) ; )
4705 if (TREE_VALUE (t2) == alias_decl
4706 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
4707 *p = TREE_CHAIN (t2);
4709 p = &TREE_CHAIN (t2);
4712 /* Remove other weakrefs to the same target, to speed things up. */
4713 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
4715 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
4716 *p = TREE_CHAIN (t2);
4718 p = &TREE_CHAIN (t2);
4723 for (t = weak_decls; t; t = TREE_CHAIN (t))
4725 tree decl = TREE_VALUE (t);
4727 weak_finish_1 (decl);
4731 /* Emit the assembly bits to indicate that DECL is globally visible. */
4734 globalize_decl (tree decl)
4736 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
4738 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
4739 if (DECL_WEAK (decl))
4743 #ifdef ASM_WEAKEN_DECL
4744 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
4746 ASM_WEAKEN_LABEL (asm_out_file, name);
4749 /* Remove this function from the pending weak list so that
4750 we do not emit multiple .weak directives for it. */
4751 for (p = &weak_decls; (t = *p) ; )
4753 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
4754 *p = TREE_CHAIN (t);
4756 p = &TREE_CHAIN (t);
4759 /* Remove weakrefs to the same target from the pending weakref
4760 list, for the same reason. */
4761 for (p = &weakref_targets; (t = *p) ; )
4763 if (DECL_ASSEMBLER_NAME (decl)
4764 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
4765 *p = TREE_CHAIN (t);
4767 p = &TREE_CHAIN (t);
4772 #elif defined(ASM_MAKE_LABEL_LINKONCE)
4773 if (DECL_ONE_ONLY (decl))
4774 ASM_MAKE_LABEL_LINKONCE (asm_out_file, name);
4777 targetm.asm_out.globalize_label (asm_out_file, name);
4780 /* We have to be able to tell cgraph about the needed-ness of the target
4781 of an alias. This requires that the decl have been defined. Aliases
4782 that precede their definition have to be queued for later processing. */
4784 typedef struct alias_pair GTY(())
4790 /* Define gc'd vector type. */
4791 DEF_VEC_O(alias_pair);
4792 DEF_VEC_ALLOC_O(alias_pair,gc);
4794 static GTY(()) VEC(alias_pair,gc) *alias_pairs;
4796 /* Given an assembly name, find the decl it is associated with. At the
4797 same time, mark it needed for cgraph. */
4800 find_decl_and_mark_needed (tree decl, tree target)
4802 struct cgraph_node *fnode = NULL;
4803 struct cgraph_varpool_node *vnode = NULL;
4805 if (TREE_CODE (decl) == FUNCTION_DECL)
4807 fnode = cgraph_node_for_asm (target);
4809 vnode = cgraph_varpool_node_for_asm (target);
4813 vnode = cgraph_varpool_node_for_asm (target);
4815 fnode = cgraph_node_for_asm (target);
4820 /* We can't mark function nodes as used after cgraph global info
4821 is finished. This wouldn't generally be necessary, but C++
4822 virtual table thunks are introduced late in the game and
4823 might seem like they need marking, although in fact they
4825 if (! cgraph_global_info_ready)
4826 cgraph_mark_needed_node (fnode);
4831 cgraph_varpool_mark_needed_node (vnode);
4838 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
4839 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
4840 tree node is DECL to have the value of the tree node TARGET. */
4843 do_assemble_alias (tree decl, tree target)
4845 if (TREE_ASM_WRITTEN (decl))
4848 TREE_ASM_WRITTEN (decl) = 1;
4849 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
4851 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
4853 ultimate_transparent_alias_target (&target);
4855 if (!TREE_SYMBOL_REFERENCED (target))
4856 weakref_targets = tree_cons (decl, target, weakref_targets);
4858 #ifdef ASM_OUTPUT_WEAKREF
4859 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
4860 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
4861 IDENTIFIER_POINTER (target));
4865 error ("%Jweakref is not supported in this configuration", decl);
4872 #ifdef ASM_OUTPUT_DEF
4873 /* Make name accessible from other files, if appropriate. */
4875 if (TREE_PUBLIC (decl))
4877 globalize_decl (decl);
4878 maybe_assemble_visibility (decl);
4881 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
4882 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
4884 ASM_OUTPUT_DEF (asm_out_file,
4885 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
4886 IDENTIFIER_POINTER (target));
4888 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
4893 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4894 # ifdef ASM_WEAKEN_DECL
4895 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
4897 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
4899 /* Remove this function from the pending weak list so that
4900 we do not emit multiple .weak directives for it. */
4901 for (p = &weak_decls; (t = *p) ; )
4902 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
4903 *p = TREE_CHAIN (t);
4905 p = &TREE_CHAIN (t);
4907 /* Remove weakrefs to the same target from the pending weakref
4908 list, for the same reason. */
4909 for (p = &weakref_targets; (t = *p) ; )
4911 if (DECL_ASSEMBLER_NAME (decl)
4912 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
4913 *p = TREE_CHAIN (t);
4915 p = &TREE_CHAIN (t);
4921 /* First pass of completing pending aliases. Make sure that cgraph knows
4922 which symbols will be required. */
4925 finish_aliases_1 (void)
4930 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
4934 target_decl = find_decl_and_mark_needed (p->decl, p->target);
4935 if (target_decl == NULL)
4937 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
4938 error ("%q+D aliased to undefined symbol %qs",
4939 p->decl, IDENTIFIER_POINTER (p->target));
4941 else if (DECL_EXTERNAL (target_decl)
4942 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
4943 error ("%q+D aliased to external symbol %qs",
4944 p->decl, IDENTIFIER_POINTER (p->target));
4948 /* Second pass of completing pending aliases. Emit the actual assembly.
4949 This happens at the end of compilation and thus it is assured that the
4950 target symbol has been emitted. */
4953 finish_aliases_2 (void)
4958 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
4959 do_assemble_alias (p->decl, p->target);
4961 VEC_truncate (alias_pair, alias_pairs, 0);
4964 /* Emit an assembler directive to make the symbol for DECL an alias to
4965 the symbol for TARGET. */
4968 assemble_alias (tree decl, tree target)
4971 bool is_weakref = false;
4973 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
4975 tree alias = DECL_ASSEMBLER_NAME (decl);
4979 ultimate_transparent_alias_target (&target);
4981 if (alias == target)
4982 error ("weakref %q+D ultimately targets itself", decl);
4985 #ifndef ASM_OUTPUT_WEAKREF
4986 IDENTIFIER_TRANSPARENT_ALIAS (alias) = 1;
4987 TREE_CHAIN (alias) = target;
4990 if (TREE_PUBLIC (decl))
4991 error ("weakref %q+D must have static linkage", decl);
4995 #if !defined (ASM_OUTPUT_DEF)
4996 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
4997 error ("%Jalias definitions not supported in this configuration", decl);
5000 if (!DECL_WEAK (decl))
5002 error ("%Jonly weak aliases are supported in this configuration", decl);
5009 /* We must force creation of DECL_RTL for debug info generation, even though
5010 we don't use it here. */
5011 make_decl_rtl (decl);
5012 TREE_USED (decl) = 1;
5014 /* A quirk of the initial implementation of aliases required that the user
5015 add "extern" to all of them. Which is silly, but now historical. Do
5016 note that the symbol is in fact locally defined. */
5018 DECL_EXTERNAL (decl) = 0;
5020 /* Allow aliases to aliases. */
5021 if (TREE_CODE (decl) == FUNCTION_DECL)
5022 cgraph_node (decl)->alias = true;
5024 cgraph_varpool_node (decl)->alias = true;
5026 /* If the target has already been emitted, we don't have to queue the
5027 alias. This saves a tad o memory. */
5028 target_decl = find_decl_and_mark_needed (decl, target);
5029 if (target_decl && TREE_ASM_WRITTEN (target_decl))
5030 do_assemble_alias (decl, target);
5033 alias_pair *p = VEC_safe_push (alias_pair, gc, alias_pairs, NULL);
5039 /* Emit an assembler directive to set symbol for DECL visibility to
5040 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5043 default_assemble_visibility (tree decl, int vis)
5045 static const char * const visibility_types[] = {
5046 NULL, "protected", "hidden", "internal"
5049 const char *name, *type;
5051 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5052 type = visibility_types[vis];
5054 #ifdef HAVE_GAS_HIDDEN
5055 fprintf (asm_out_file, "\t.%s\t", type);
5056 assemble_name (asm_out_file, name);
5057 fprintf (asm_out_file, "\n");
5059 warning (OPT_Wattributes, "visibility attribute not supported "
5060 "in this configuration; ignored");
5064 /* A helper function to call assemble_visibility when needed for a decl. */
5067 maybe_assemble_visibility (tree decl)
5069 enum symbol_visibility vis = DECL_VISIBILITY (decl);
5071 if (vis != VISIBILITY_DEFAULT)
5072 targetm.asm_out.visibility (decl, vis);
5075 /* Returns 1 if the target configuration supports defining public symbols
5076 so that one of them will be chosen at link time instead of generating a
5077 multiply-defined symbol error, whether through the use of weak symbols or
5078 a target-specific mechanism for having duplicates discarded. */
5081 supports_one_only (void)
5083 if (SUPPORTS_ONE_ONLY)
5085 return SUPPORTS_WEAK;
5088 /* Set up DECL as a public symbol that can be defined in multiple
5089 translation units without generating a linker error. */
5092 make_decl_one_only (tree decl)
5094 gcc_assert (TREE_CODE (decl) == VAR_DECL
5095 || TREE_CODE (decl) == FUNCTION_DECL);
5097 TREE_PUBLIC (decl) = 1;
5099 if (SUPPORTS_ONE_ONLY)
5101 #ifdef MAKE_DECL_ONE_ONLY
5102 MAKE_DECL_ONE_ONLY (decl);
5104 DECL_ONE_ONLY (decl) = 1;
5106 else if (TREE_CODE (decl) == VAR_DECL
5107 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
5108 DECL_COMMON (decl) = 1;
5111 gcc_assert (SUPPORTS_WEAK);
5112 DECL_WEAK (decl) = 1;
5117 init_varasm_once (void)
5119 section_htab = htab_create_ggc (31, section_entry_hash,
5120 section_entry_eq, NULL);
5121 object_block_htab = htab_create_ggc (31, object_block_entry_hash,
5122 object_block_entry_eq, NULL);
5123 const_desc_htab = htab_create_ggc (1009, const_desc_hash,
5124 const_desc_eq, NULL);
5126 const_alias_set = new_alias_set ();
5127 shared_constant_pool = create_constant_pool ();
5129 #ifdef TEXT_SECTION_ASM_OP
5130 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
5131 TEXT_SECTION_ASM_OP);
5134 #ifdef DATA_SECTION_ASM_OP
5135 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5136 DATA_SECTION_ASM_OP);
5139 #ifdef SDATA_SECTION_ASM_OP
5140 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5141 SDATA_SECTION_ASM_OP);
5144 #ifdef READONLY_DATA_SECTION_ASM_OP
5145 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
5146 READONLY_DATA_SECTION_ASM_OP);
5149 #ifdef CTORS_SECTION_ASM_OP
5150 ctors_section = get_unnamed_section (0, output_section_asm_op,
5151 CTORS_SECTION_ASM_OP);
5154 #ifdef DTORS_SECTION_ASM_OP
5155 dtors_section = get_unnamed_section (0, output_section_asm_op,
5156 DTORS_SECTION_ASM_OP);
5159 #ifdef BSS_SECTION_ASM_OP
5160 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5161 output_section_asm_op,
5162 BSS_SECTION_ASM_OP);
5165 #ifdef SBSS_SECTION_ASM_OP
5166 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5167 output_section_asm_op,
5168 SBSS_SECTION_ASM_OP);
5171 tls_comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5172 | SECTION_COMMON, emit_tls_common);
5173 lcomm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5174 | SECTION_COMMON, emit_local);
5175 comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5176 | SECTION_COMMON, emit_common);
5178 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5179 bss_noswitch_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS,
5183 targetm.asm_out.init_sections ();
5185 if (readonly_data_section == NULL)
5186 readonly_data_section = text_section;
5190 decl_default_tls_model (tree decl)
5192 enum tls_model kind;
5195 is_local = targetm.binds_local_p (decl);
5199 kind = TLS_MODEL_LOCAL_EXEC;
5201 kind = TLS_MODEL_INITIAL_EXEC;
5204 /* Local dynamic is inefficient when we're not combining the
5205 parts of the address. */
5206 else if (optimize && is_local)
5207 kind = TLS_MODEL_LOCAL_DYNAMIC;
5209 kind = TLS_MODEL_GLOBAL_DYNAMIC;
5210 if (kind < flag_tls_default)
5211 kind = flag_tls_default;
5216 /* Select a set of attributes for section NAME based on the properties
5217 of DECL and whether or not RELOC indicates that DECL's initializer
5218 might contain runtime relocations.
5220 We make the section read-only and executable for a function decl,
5221 read-only for a const data decl, and writable for a non-const data decl. */
5224 default_section_type_flags (tree decl, const char *name, int reloc)
5228 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
5229 flags = SECTION_CODE;
5230 else if (decl && decl_readonly_section (decl, reloc))
5232 else if (current_function_decl
5234 && cfun->unlikely_text_section_name
5235 && strcmp (name, cfun->unlikely_text_section_name) == 0)
5236 flags = SECTION_CODE;
5238 && (!current_function_decl || !cfun)
5239 && strcmp (name, UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
5240 flags = SECTION_CODE;
5242 flags = SECTION_WRITE;
5244 if (decl && DECL_ONE_ONLY (decl))
5245 flags |= SECTION_LINKONCE;
5247 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5248 flags |= SECTION_TLS | SECTION_WRITE;
5250 if (strcmp (name, ".bss") == 0
5251 || strncmp (name, ".bss.", 5) == 0
5252 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
5253 || strcmp (name, ".sbss") == 0
5254 || strncmp (name, ".sbss.", 6) == 0
5255 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
5256 flags |= SECTION_BSS;
5258 if (strcmp (name, ".tdata") == 0
5259 || strncmp (name, ".tdata.", 7) == 0
5260 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
5261 flags |= SECTION_TLS;
5263 if (strcmp (name, ".tbss") == 0
5264 || strncmp (name, ".tbss.", 6) == 0
5265 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
5266 flags |= SECTION_TLS | SECTION_BSS;
5268 /* These three sections have special ELF types. They are neither
5269 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5270 want to print a section type (@progbits or @nobits). If someone
5271 is silly enough to emit code or TLS variables to one of these
5272 sections, then don't handle them specially. */
5273 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
5274 && (strcmp (name, ".init_array") == 0
5275 || strcmp (name, ".fini_array") == 0
5276 || strcmp (name, ".preinit_array") == 0))
5277 flags |= SECTION_NOTYPE;
5282 /* Return true if the target supports some form of global BSS,
5283 either through bss_noswitch_section, or by selecting a BSS
5284 section in TARGET_ASM_SELECT_SECTION. */
5287 have_global_bss_p (void)
5289 return bss_noswitch_section || targetm.have_switchable_bss_sections;
5292 /* Output assembly to switch to section NAME with attribute FLAGS.
5293 Four variants for common object file formats. */
5296 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
5297 unsigned int flags ATTRIBUTE_UNUSED,
5298 tree decl ATTRIBUTE_UNUSED)
5300 /* Some object formats don't support named sections at all. The
5301 front-end should already have flagged this as an error. */
5306 default_elf_asm_named_section (const char *name, unsigned int flags,
5307 tree decl ATTRIBUTE_UNUSED)
5309 char flagchars[10], *f = flagchars;
5311 /* If we have already declared this section, we can use an
5312 abbreviated form to switch back to it -- unless this section is
5313 part of a COMDAT groups, in which case GAS requires the full
5314 declaration every time. */
5315 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5316 && (flags & SECTION_DECLARED))
5318 fprintf (asm_out_file, "\t.section\t%s\n", name);
5322 if (!(flags & SECTION_DEBUG))
5324 if (flags & SECTION_WRITE)
5326 if (flags & SECTION_CODE)
5328 if (flags & SECTION_SMALL)
5330 if (flags & SECTION_MERGE)
5332 if (flags & SECTION_STRINGS)
5334 if (flags & SECTION_TLS)
5336 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5340 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
5342 if (!(flags & SECTION_NOTYPE))
5347 if (flags & SECTION_BSS)
5353 #ifdef ASM_COMMENT_START
5354 /* On platforms that use "@" as the assembly comment character,
5356 if (strcmp (ASM_COMMENT_START, "@") == 0)
5359 fprintf (asm_out_file, format, type);
5361 if (flags & SECTION_ENTSIZE)
5362 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
5363 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5364 fprintf (asm_out_file, ",%s,comdat",
5365 lang_hooks.decls.comdat_group (decl));
5368 putc ('\n', asm_out_file);
5372 default_coff_asm_named_section (const char *name, unsigned int flags,
5373 tree decl ATTRIBUTE_UNUSED)
5375 char flagchars[8], *f = flagchars;
5377 if (flags & SECTION_WRITE)
5379 if (flags & SECTION_CODE)
5383 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
5387 default_pe_asm_named_section (const char *name, unsigned int flags,
5390 default_coff_asm_named_section (name, flags, decl);
5392 if (flags & SECTION_LINKONCE)
5394 /* Functions may have been compiled at various levels of
5395 optimization so we can't use `same_size' here.
5396 Instead, have the linker pick one. */
5397 fprintf (asm_out_file, "\t.linkonce %s\n",
5398 (flags & SECTION_CODE ? "discard" : "same_size"));
5402 /* The lame default section selector. */
5405 default_select_section (tree decl, int reloc,
5406 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
5410 if (decl_readonly_section (decl, reloc))
5411 return readonly_data_section;
5413 else if (TREE_CODE (decl) == CONSTRUCTOR)
5415 if (! ((flag_pic && reloc)
5416 || !TREE_READONLY (decl)
5417 || TREE_SIDE_EFFECTS (decl)
5418 || !TREE_CONSTANT (decl)))
5419 return readonly_data_section;
5421 else if (TREE_CODE (decl) == STRING_CST)
5422 return readonly_data_section;
5423 else if (! (flag_pic && reloc))
5424 return readonly_data_section;
5426 return data_section;
5429 enum section_category
5430 categorize_decl_for_section (tree decl, int reloc)
5432 enum section_category ret;
5434 if (TREE_CODE (decl) == FUNCTION_DECL)
5436 else if (TREE_CODE (decl) == STRING_CST)
5438 if (flag_mudflap) /* or !flag_merge_constants */
5439 return SECCAT_RODATA;
5441 return SECCAT_RODATA_MERGE_STR;
5443 else if (TREE_CODE (decl) == VAR_DECL)
5445 if (bss_initializer_p (decl))
5447 else if (! TREE_READONLY (decl)
5448 || TREE_SIDE_EFFECTS (decl)
5449 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
5451 /* Here the reloc_rw_mask is not testing whether the section should
5452 be read-only or not, but whether the dynamic link will have to
5453 do something. If so, we wish to segregate the data in order to
5454 minimize cache misses inside the dynamic linker. */
5455 if (reloc & targetm.asm_out.reloc_rw_mask ())
5456 ret = reloc == 1 ? SECCAT_DATA_REL_LOCAL : SECCAT_DATA_REL;
5460 else if (reloc & targetm.asm_out.reloc_rw_mask ())
5461 ret = reloc == 1 ? SECCAT_DATA_REL_RO_LOCAL : SECCAT_DATA_REL_RO;
5462 else if (reloc || flag_merge_constants < 2)
5463 /* C and C++ don't allow different variables to share the same
5464 location. -fmerge-all-constants allows even that (at the
5465 expense of not conforming). */
5466 ret = SECCAT_RODATA;
5467 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
5468 ret = SECCAT_RODATA_MERGE_STR_INIT;
5470 ret = SECCAT_RODATA_MERGE_CONST;
5472 else if (TREE_CODE (decl) == CONSTRUCTOR)
5474 if ((reloc & targetm.asm_out.reloc_rw_mask ())
5475 || TREE_SIDE_EFFECTS (decl)
5476 || ! TREE_CONSTANT (decl))
5479 ret = SECCAT_RODATA;
5482 ret = SECCAT_RODATA;
5484 /* There are no read-only thread-local sections. */
5485 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5487 /* Note that this would be *just* SECCAT_BSS, except that there's
5488 no concept of a read-only thread-local-data section. */
5489 if (ret == SECCAT_BSS
5490 || (flag_zero_initialized_in_bss
5491 && initializer_zerop (DECL_INITIAL (decl))))
5497 /* If the target uses small data sections, select it. */
5498 else if (targetm.in_small_data_p (decl))
5500 if (ret == SECCAT_BSS)
5502 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
5503 ret = SECCAT_SRODATA;
5512 decl_readonly_section (tree decl, int reloc)
5514 switch (categorize_decl_for_section (decl, reloc))
5517 case SECCAT_RODATA_MERGE_STR:
5518 case SECCAT_RODATA_MERGE_STR_INIT:
5519 case SECCAT_RODATA_MERGE_CONST:
5520 case SECCAT_SRODATA:
5529 /* Select a section based on the above categorization. */
5532 default_elf_select_section (tree decl, int reloc,
5533 unsigned HOST_WIDE_INT align)
5536 switch (categorize_decl_for_section (decl, reloc))
5539 /* We're not supposed to be called on FUNCTION_DECLs. */
5542 return readonly_data_section;
5543 case SECCAT_RODATA_MERGE_STR:
5544 return mergeable_string_section (decl, align, 0);
5545 case SECCAT_RODATA_MERGE_STR_INIT:
5546 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
5547 case SECCAT_RODATA_MERGE_CONST:
5548 return mergeable_constant_section (DECL_MODE (decl), align, 0);
5549 case SECCAT_SRODATA:
5553 return data_section;
5554 case SECCAT_DATA_REL:
5555 sname = ".data.rel";
5557 case SECCAT_DATA_REL_LOCAL:
5558 sname = ".data.rel.local";
5560 case SECCAT_DATA_REL_RO:
5561 sname = ".data.rel.ro";
5563 case SECCAT_DATA_REL_RO_LOCAL:
5564 sname = ".data.rel.ro.local";
5589 return get_named_section (decl, sname, reloc);
5592 /* Construct a unique section name based on the decl name and the
5593 categorization performed above. */
5596 default_unique_section (tree decl, int reloc)
5598 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
5599 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
5600 const char *prefix, *name;
5604 switch (categorize_decl_for_section (decl, reloc))
5607 prefix = one_only ? ".gnu.linkonce.t." : ".text.";
5610 case SECCAT_RODATA_MERGE_STR:
5611 case SECCAT_RODATA_MERGE_STR_INIT:
5612 case SECCAT_RODATA_MERGE_CONST:
5613 prefix = one_only ? ".gnu.linkonce.r." : ".rodata.";
5615 case SECCAT_SRODATA:
5616 prefix = one_only ? ".gnu.linkonce.s2." : ".sdata2.";
5619 prefix = one_only ? ".gnu.linkonce.d." : ".data.";
5621 case SECCAT_DATA_REL:
5622 prefix = one_only ? ".gnu.linkonce.d.rel." : ".data.rel.";
5624 case SECCAT_DATA_REL_LOCAL:
5625 prefix = one_only ? ".gnu.linkonce.d.rel.local." : ".data.rel.local.";
5627 case SECCAT_DATA_REL_RO:
5628 prefix = one_only ? ".gnu.linkonce.d.rel.ro." : ".data.rel.ro.";
5630 case SECCAT_DATA_REL_RO_LOCAL:
5631 prefix = one_only ? ".gnu.linkonce.d.rel.ro.local."
5632 : ".data.rel.ro.local.";
5635 prefix = one_only ? ".gnu.linkonce.s." : ".sdata.";
5638 prefix = one_only ? ".gnu.linkonce.b." : ".bss.";
5641 prefix = one_only ? ".gnu.linkonce.sb." : ".sbss.";
5644 prefix = one_only ? ".gnu.linkonce.td." : ".tdata.";
5647 prefix = one_only ? ".gnu.linkonce.tb." : ".tbss.";
5652 plen = strlen (prefix);
5654 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5655 name = targetm.strip_name_encoding (name);
5656 nlen = strlen (name);
5658 string = alloca (nlen + plen + 1);
5659 memcpy (string, prefix, plen);
5660 memcpy (string + plen, name, nlen + 1);
5662 DECL_SECTION_NAME (decl) = build_string (nlen + plen, string);
5665 /* Like compute_reloc_for_constant, except for an RTX. The return value
5666 is a mask for which bit 1 indicates a global relocation, and bit 0
5667 indicates a local relocation. */
5670 compute_reloc_for_rtx_1 (rtx *xp, void *data)
5675 switch (GET_CODE (x))
5678 *preloc |= SYMBOL_REF_LOCAL_P (x) ? 1 : 2;
5691 compute_reloc_for_rtx (rtx x)
5695 switch (GET_CODE (x))
5701 for_each_rtx (&x, compute_reloc_for_rtx_1, &reloc);
5710 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED,
5712 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
5714 if (compute_reloc_for_rtx (x) & targetm.asm_out.reloc_rw_mask ())
5715 return data_section;
5717 return readonly_data_section;
5721 default_elf_select_rtx_section (enum machine_mode mode, rtx x,
5722 unsigned HOST_WIDE_INT align)
5724 int reloc = compute_reloc_for_rtx (x);
5726 /* ??? Handle small data here somehow. */
5728 if (reloc & targetm.asm_out.reloc_rw_mask ())
5731 return get_named_section (NULL, ".data.rel.ro.local", 1);
5733 return get_named_section (NULL, ".data.rel.ro", 3);
5736 return mergeable_constant_section (mode, align, 0);
5739 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
5742 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
5747 /* Careful not to prod global register variables. */
5750 symbol = XEXP (rtl, 0);
5751 if (GET_CODE (symbol) != SYMBOL_REF)
5754 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_HAS_BLOCK_INFO;
5755 if (TREE_CODE (decl) == FUNCTION_DECL)
5756 flags |= SYMBOL_FLAG_FUNCTION;
5757 if (targetm.binds_local_p (decl))
5758 flags |= SYMBOL_FLAG_LOCAL;
5759 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5760 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
5761 else if (targetm.in_small_data_p (decl))
5762 flags |= SYMBOL_FLAG_SMALL;
5763 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
5764 being PUBLIC, the thing *must* be defined in this translation unit.
5765 Prevent this buglet from being propagated into rtl code as well. */
5766 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
5767 flags |= SYMBOL_FLAG_EXTERNAL;
5769 SYMBOL_REF_FLAGS (symbol) = flags;
5772 /* By default, we do nothing for encode_section_info, so we need not
5773 do anything but discard the '*' marker. */
5776 default_strip_name_encoding (const char *str)
5778 return str + (*str == '*');
5781 #ifdef ASM_OUTPUT_DEF
5782 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
5783 anchor relative to ".", the current section position. */
5786 default_asm_output_anchor (rtx symbol)
5790 sprintf (buffer, ". + " HOST_WIDE_INT_PRINT_DEC,
5791 SYMBOL_REF_BLOCK_OFFSET (symbol));
5792 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
5796 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
5799 default_use_anchors_for_symbol_p (rtx symbol)
5804 /* Don't use anchors for mergeable sections. The linker might move
5805 the objects around. */
5806 sect = SYMBOL_REF_BLOCK (symbol)->sect;
5807 if (sect->common.flags & SECTION_MERGE)
5810 /* Don't use anchors for small data sections. The small data register
5811 acts as an anchor for such sections. */
5812 if (sect->common.flags & SECTION_SMALL)
5815 decl = SYMBOL_REF_DECL (symbol);
5816 if (decl && DECL_P (decl))
5818 /* Don't use section anchors for decls that might be defined by
5820 if (!targetm.binds_local_p (decl))
5823 /* Don't use section anchors for decls that will be placed in a
5824 small data section. */
5825 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
5826 one above. The problem is that we only use SECTION_SMALL for
5827 sections that should be marked as small in the section directive. */
5828 if (targetm.in_small_data_p (decl))
5834 /* Assume ELF-ish defaults, since that's pretty much the most liberal
5835 wrt cross-module name binding. */
5838 default_binds_local_p (tree exp)
5840 return default_binds_local_p_1 (exp, flag_shlib);
5844 default_binds_local_p_1 (tree exp, int shlib)
5848 /* A non-decl is an entry in the constant pool. */
5851 /* Weakrefs may not bind locally, even though the weakref itself is
5852 always static and therefore local. */
5853 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp)))
5855 /* Static variables are always local. */
5856 else if (! TREE_PUBLIC (exp))
5858 /* A variable is local if the user has said explicitly that it will
5860 else if (DECL_VISIBILITY_SPECIFIED (exp)
5861 && DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
5863 /* Variables defined outside this object might not be local. */
5864 else if (DECL_EXTERNAL (exp))
5866 /* If defined in this object and visibility is not default, must be
5868 else if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
5870 /* Default visibility weak data can be overridden by a strong symbol
5871 in another module and so are not local. */
5872 else if (DECL_WEAK (exp))
5874 /* If PIC, then assume that any global name can be overridden by
5875 symbols resolved from other modules, unless we are compiling with
5876 -fwhole-program, which assumes that names are local. */
5878 local_p = flag_whole_program;
5879 /* Uninitialized COMMON variable may be unified with symbols
5880 resolved from other modules. */
5881 else if (DECL_COMMON (exp)
5882 && (DECL_INITIAL (exp) == NULL
5883 || DECL_INITIAL (exp) == error_mark_node))
5885 /* Otherwise we're left with initialized (or non-common) global data
5886 which is of necessity defined locally. */
5893 /* Determine whether or not a pointer mode is valid. Assume defaults
5894 of ptr_mode or Pmode - can be overridden. */
5896 default_valid_pointer_mode (enum machine_mode mode)
5898 return (mode == ptr_mode || mode == Pmode);
5901 /* Default function to output code that will globalize a label. A
5902 target must define GLOBAL_ASM_OP or provide its own function to
5903 globalize a label. */
5904 #ifdef GLOBAL_ASM_OP
5906 default_globalize_label (FILE * stream, const char *name)
5908 fputs (GLOBAL_ASM_OP, stream);
5909 assemble_name (stream, name);
5910 putc ('\n', stream);
5912 #endif /* GLOBAL_ASM_OP */
5914 /* Default function to output a label for unwind information. The
5915 default is to do nothing. A target that needs nonlocal labels for
5916 unwind information must provide its own function to do this. */
5918 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
5919 tree decl ATTRIBUTE_UNUSED,
5920 int for_eh ATTRIBUTE_UNUSED,
5921 int empty ATTRIBUTE_UNUSED)
5925 /* Default function to output a label to divide up the exception table.
5926 The default is to do nothing. A target that needs/wants to divide
5927 up the table must provide it's own function to do this. */
5929 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
5933 /* This is how to output an internal numbered label where PREFIX is
5934 the class of label and LABELNO is the number within the class. */
5937 default_internal_label (FILE *stream, const char *prefix,
5938 unsigned long labelno)
5940 char *const buf = alloca (40 + strlen (prefix));
5941 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
5942 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
5945 /* This is the default behavior at the beginning of a file. It's
5946 controlled by two other target-hook toggles. */
5948 default_file_start (void)
5950 if (targetm.file_start_app_off && !flag_verbose_asm)
5951 fputs (ASM_APP_OFF, asm_out_file);
5953 if (targetm.file_start_file_directive)
5954 output_file_directive (asm_out_file, main_input_filename);
5957 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
5958 which emits a special section directive used to indicate whether or
5959 not this object file needs an executable stack. This is primarily
5960 a GNU extension to ELF but could be used on other targets. */
5962 int trampolines_created;
5965 file_end_indicate_exec_stack (void)
5967 unsigned int flags = SECTION_DEBUG;
5968 if (trampolines_created)
5969 flags |= SECTION_CODE;
5971 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
5974 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
5975 a get_unnamed_section callback. */
5978 output_section_asm_op (const void *directive)
5980 fprintf (asm_out_file, "%s\n", (const char *) directive);
5983 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
5984 the current section is NEW_SECTION. */
5987 switch_to_section (section *new_section)
5989 if (in_section == new_section)
5992 if (new_section->common.flags & SECTION_FORGET)
5995 in_section = new_section;
5997 switch (SECTION_STYLE (new_section))
6001 && !cfun->unlikely_text_section_name
6002 && strcmp (new_section->named.name,
6003 UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
6004 cfun->unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
6006 targetm.asm_out.named_section (new_section->named.name,
6007 new_section->named.common.flags,
6008 new_section->named.decl);
6011 case SECTION_UNNAMED:
6012 new_section->unnamed.callback (new_section->unnamed.data);
6015 case SECTION_NOSWITCH:
6020 new_section->common.flags |= SECTION_DECLARED;
6023 /* If block symbol SYMBOL has not yet been assigned an offset, place
6024 it at the end of its block. */
6027 place_block_symbol (rtx symbol)
6029 unsigned HOST_WIDE_INT size, mask, offset;
6030 struct constant_descriptor_rtx *desc;
6031 unsigned int alignment;
6032 struct object_block *block;
6035 gcc_assert (SYMBOL_REF_BLOCK (symbol));
6036 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
6039 /* Work out the symbol's size and alignment. */
6040 if (CONSTANT_POOL_ADDRESS_P (symbol))
6042 desc = SYMBOL_REF_CONSTANT (symbol);
6043 alignment = desc->align;
6044 size = GET_MODE_SIZE (desc->mode);
6046 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6048 decl = SYMBOL_REF_DECL (symbol);
6049 alignment = get_constant_alignment (decl);
6050 size = get_constant_size (decl);
6054 decl = SYMBOL_REF_DECL (symbol);
6055 alignment = DECL_ALIGN (decl);
6056 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6059 /* Calculate the object's offset from the start of the block. */
6060 block = SYMBOL_REF_BLOCK (symbol);
6061 mask = alignment / BITS_PER_UNIT - 1;
6062 offset = (block->size + mask) & ~mask;
6063 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
6065 /* Record the block's new alignment and size. */
6066 block->alignment = MAX (block->alignment, alignment);
6067 block->size = offset + size;
6069 VEC_safe_push (rtx, gc, block->objects, symbol);
6072 /* Return the anchor that should be used to address byte offset OFFSET
6073 from the first object in BLOCK. MODEL is the TLS model used
6077 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
6078 enum tls_model model)
6081 unsigned int begin, middle, end;
6082 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
6085 /* Work out the anchor's offset. Use an offset of 0 for the first
6086 anchor so that we don't pessimize the case where we take the address
6087 of a variable at the beginning of the block. This is particularly
6088 useful when a block has only one variable assigned to it.
6090 We try to place anchors RANGE bytes apart, so there can then be
6091 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6092 a ptr_mode offset. With some target settings, the lowest such
6093 anchor might be out of range for the lowest ptr_mode offset;
6094 likewise the highest anchor for the highest offset. Use anchors
6095 at the extreme ends of the ptr_mode range in such cases.
6097 All arithmetic uses unsigned integers in order to avoid
6099 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
6100 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
6101 range = max_offset - min_offset + 1;
6106 bias = 1 << (GET_MODE_BITSIZE (ptr_mode) - 1);
6109 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
6110 delta -= delta % range;
6113 offset = (HOST_WIDE_INT) (-delta);
6117 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
6118 delta -= delta % range;
6119 if (delta > bias - 1)
6121 offset = (HOST_WIDE_INT) delta;
6125 /* Do a binary search to see if there's already an anchor we can use.
6126 Set BEGIN to the new anchor's index if not. */
6128 end = VEC_length (rtx, block->anchors);
6129 while (begin != end)
6131 middle = (end + begin) / 2;
6132 anchor = VEC_index (rtx, block->anchors, middle);
6133 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
6135 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
6137 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
6139 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
6145 /* Create a new anchor with a unique label. */
6146 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
6147 anchor = create_block_symbol (ggc_strdup (label), block, offset);
6148 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
6149 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
6151 /* Insert it at index BEGIN. */
6152 VEC_safe_insert (rtx, gc, block->anchors, begin, anchor);
6156 /* Output the objects in BLOCK. */
6159 output_object_block (struct object_block *block)
6161 struct constant_descriptor_rtx *desc;
6163 HOST_WIDE_INT offset;
6167 if (block->objects == NULL)
6170 /* Switch to the section and make sure that the first byte is
6171 suitably aligned. */
6172 switch_to_section (block->sect);
6173 assemble_align (block->alignment);
6175 /* Define the values of all anchors relative to the current section
6177 for (i = 0; VEC_iterate (rtx, block->anchors, i, symbol); i++)
6178 targetm.asm_out.output_anchor (symbol);
6180 /* Output the objects themselves. */
6182 for (i = 0; VEC_iterate (rtx, block->objects, i, symbol); i++)
6184 /* Move to the object's offset, padding with zeros if necessary. */
6185 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
6186 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
6187 if (CONSTANT_POOL_ADDRESS_P (symbol))
6189 desc = SYMBOL_REF_CONSTANT (symbol);
6190 output_constant_pool_1 (desc, 1);
6191 offset += GET_MODE_SIZE (desc->mode);
6193 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6195 decl = SYMBOL_REF_DECL (symbol);
6196 assemble_constant_contents (decl, XSTR (symbol, 0),
6197 get_constant_alignment (decl));
6198 offset += get_constant_size (decl);
6202 decl = SYMBOL_REF_DECL (symbol);
6203 assemble_variable_contents (decl, XSTR (symbol, 0), false);
6204 offset += tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6209 /* A htab_traverse callback used to call output_object_block for
6210 each member of object_block_htab. */
6213 output_object_block_htab (void **slot, void *data ATTRIBUTE_UNUSED)
6215 output_object_block ((struct object_block *) (*slot));
6219 /* Output the definitions of all object_blocks. */
6222 output_object_blocks (void)
6224 htab_traverse (object_block_htab, output_object_block_htab, NULL);
6227 #include "gt-varasm.h"