1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
24 /* This file handles generation of all the assembler code
25 *except* the instructions of a function.
26 This includes declarations of variables and their initial values.
28 We also output the assembler code for constants stored in memory
29 and are responsible for combining constants with the same value. */
33 #include "coretypes.h"
40 #include "hard-reg-set.h"
48 #include "langhooks.h"
52 #include "tree-mudflap.h"
54 #include "cfglayout.h"
55 #include "basic-block.h"
57 #ifdef XCOFF_DEBUGGING_INFO
58 #include "xcoffout.h" /* Needed for external data
59 declarations for e.g. AIX 4.x. */
62 /* The (assembler) name of the first globally-visible object output. */
63 extern GTY(()) const char *first_global_object_name;
64 extern GTY(()) const char *weak_global_object_name;
66 const char *first_global_object_name;
67 const char *weak_global_object_name;
70 struct constant_descriptor_rtx;
71 struct rtx_constant_pool;
73 struct varasm_status GTY(())
75 /* If we're using a per-function constant pool, this is it. */
76 struct rtx_constant_pool *pool;
78 /* Number of tree-constants deferred during the expansion of this
80 unsigned int deferred_constants;
83 #define n_deferred_constants (cfun->varasm->deferred_constants)
85 /* Number for making the label on the next
86 constant that is stored in memory. */
88 static GTY(()) int const_labelno;
90 /* Carry information from ASM_DECLARE_OBJECT_NAME
91 to ASM_FINISH_DECLARE_OBJECT. */
93 int size_directive_output;
95 /* The last decl for which assemble_variable was called,
96 if it did ASM_DECLARE_OBJECT_NAME.
97 If the last call to assemble_variable didn't do that,
100 tree last_assemble_variable_decl;
102 /* The following global variable indicates if the first basic block
103 in a function belongs to the cold partition or not. */
105 bool first_function_block_is_cold;
107 /* We give all constants their own alias set. Perhaps redundant with
108 MEM_READONLY_P, but pre-dates it. */
110 static HOST_WIDE_INT const_alias_set;
112 static const char *strip_reg_name (const char *);
113 static int contains_pointers_p (tree);
114 #ifdef ASM_OUTPUT_EXTERNAL
115 static bool incorporeal_function_p (tree);
117 static void decode_addr_const (tree, struct addr_const *);
118 static hashval_t const_desc_hash (const void *);
119 static int const_desc_eq (const void *, const void *);
120 static hashval_t const_hash_1 (const tree);
121 static int compare_constant (const tree, const tree);
122 static tree copy_constant (tree);
123 static void output_constant_def_contents (rtx);
124 static void output_addressed_constants (tree);
125 static unsigned HOST_WIDE_INT array_size_for_constructor (tree);
126 static unsigned min_align (unsigned, unsigned);
127 static void output_constructor (tree, unsigned HOST_WIDE_INT, unsigned int);
128 static void globalize_decl (tree);
129 static void maybe_assemble_visibility (tree);
130 #ifdef BSS_SECTION_ASM_OP
131 #ifdef ASM_OUTPUT_BSS
132 static void asm_output_bss (FILE *, tree, const char *,
133 unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT);
135 #ifdef ASM_OUTPUT_ALIGNED_BSS
136 static void asm_output_aligned_bss (FILE *, tree, const char *,
137 unsigned HOST_WIDE_INT, int)
140 #endif /* BSS_SECTION_ASM_OP */
141 static bool asm_emit_uninitialised (tree, const char*,
142 unsigned HOST_WIDE_INT,
143 unsigned HOST_WIDE_INT);
144 static void mark_weak (tree);
146 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
147 section *text_section;
148 section *data_section;
149 section *readonly_data_section;
150 section *sdata_section;
151 section *ctors_section;
152 section *dtors_section;
153 section *bss_section;
154 section *sbss_section;
156 /* The section that holds the main exception table, when known. The section
157 is set either by the target's init_sections hook or by the first call to
158 switch_to_exception_section. */
159 section *exception_section;
161 /* The section that holds the DWARF2 frame unwind information, when known.
162 The section is set either by the target's init_sections hook or by the
163 first call to switch_to_eh_frame_section. */
164 section *eh_frame_section;
166 /* asm_out_file's current section. This is NULL if no section has yet
167 been selected or if we lose track of what the current section is. */
170 /* True if code for the current function is currently being directed
171 at the cold section. */
172 bool in_cold_section_p;
174 /* A linked list of all the unnamed sections. */
175 static GTY(()) section *unnamed_sections;
177 /* Return a nonzero value if DECL has a section attribute. */
178 #ifndef IN_NAMED_SECTION
179 #define IN_NAMED_SECTION(DECL) \
180 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
181 && DECL_SECTION_NAME (DECL) != NULL_TREE)
184 /* Hash table of named sections. */
185 static GTY((param_is (section))) htab_t section_htab;
187 /* A table of object_blocks, indexed by section. */
188 static GTY((param_is (struct object_block))) htab_t object_block_htab;
190 /* The next number to use for internal anchor labels. */
191 static GTY(()) int anchor_labelno;
193 /* Helper routines for maintaining section_htab. */
196 section_entry_eq (const void *p1, const void *p2)
198 const section *old = p1;
199 const char *new = p2;
201 return strcmp (old->named.name, new) == 0;
205 section_entry_hash (const void *p)
207 const section *old = p;
208 return htab_hash_string (old->named.name);
211 /* Return a hash value for section SECT. */
214 hash_section (section *sect)
216 if (sect->common.flags & SECTION_NAMED)
217 return htab_hash_string (sect->named.name);
218 return sect->common.flags;
221 /* Helper routines for maintaining object_block_htab. */
224 object_block_entry_eq (const void *p1, const void *p2)
226 const struct object_block *old = p1;
227 const section *new = p2;
229 return old->sect == new;
233 object_block_entry_hash (const void *p)
235 const struct object_block *old = p;
236 return hash_section (old->sect);
239 /* Return a new unnamed section with the given fields. */
242 get_unnamed_section (unsigned int flags, void (*callback) (const void *),
247 sect = ggc_alloc (sizeof (struct unnamed_section));
248 sect->unnamed.common.flags = flags;
249 sect->unnamed.callback = callback;
250 sect->unnamed.data = data;
251 sect->unnamed.next = unnamed_sections;
253 unnamed_sections = sect;
257 /* Return the named section structure associated with NAME. Create
258 a new section with the given fields if no such structure exists. */
261 get_section (const char *name, unsigned int flags, tree decl)
263 section *sect, **slot;
266 htab_find_slot_with_hash (section_htab, name,
267 htab_hash_string (name), INSERT);
268 flags |= SECTION_NAMED;
271 sect = ggc_alloc (sizeof (struct named_section));
272 sect->named.common.flags = flags;
273 sect->named.name = ggc_strdup (name);
274 sect->named.decl = decl;
280 if ((sect->common.flags & ~SECTION_DECLARED) != flags
281 && ((sect->common.flags | flags) & SECTION_OVERRIDE) == 0)
283 /* Sanity check user variables for flag changes. */
285 decl = sect->named.decl;
287 error ("%+D causes a section type conflict", decl);
293 /* Return true if the current compilation mode benefits from having
294 objects grouped into blocks. */
297 use_object_blocks_p (void)
299 return flag_section_anchors;
302 /* Return the object_block structure for section SECT. Create a new
303 structure if we haven't created one already. */
305 static struct object_block *
306 get_block_for_section (section *sect)
308 struct object_block *block;
311 slot = htab_find_slot_with_hash (object_block_htab, sect,
312 hash_section (sect), INSERT);
313 block = (struct object_block *) *slot;
316 block = (struct object_block *)
317 ggc_alloc_cleared (sizeof (struct object_block));
324 /* Create a symbol with label LABEL and place it at byte offset
325 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
326 is not yet known. LABEL must be a garbage-collected string. */
329 create_block_symbol (const char *label, struct object_block *block,
330 HOST_WIDE_INT offset)
335 /* Create the extended SYMBOL_REF. */
336 size = RTX_HDR_SIZE + sizeof (struct block_symbol);
337 symbol = ggc_alloc_zone (size, &rtl_zone);
339 /* Initialize the normal SYMBOL_REF fields. */
340 memset (symbol, 0, size);
341 PUT_CODE (symbol, SYMBOL_REF);
342 PUT_MODE (symbol, Pmode);
343 XSTR (symbol, 0) = label;
344 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_IN_BLOCK;
346 /* Initialize the block_symbol stuff. */
347 SYMBOL_REF_BLOCK (symbol) = block;
348 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
354 initialize_cold_section_name (void)
356 const char *stripped_name;
360 gcc_assert (cfun && current_function_decl);
361 if (cfun->unlikely_text_section_name)
364 dsn = DECL_SECTION_NAME (current_function_decl);
365 if (flag_function_sections && dsn)
367 name = alloca (TREE_STRING_LENGTH (dsn) + 1);
368 memcpy (name, TREE_STRING_POINTER (dsn), TREE_STRING_LENGTH (dsn) + 1);
370 stripped_name = targetm.strip_name_encoding (name);
372 buffer = ACONCAT ((stripped_name, "_unlikely", NULL));
373 cfun->unlikely_text_section_name = ggc_strdup (buffer);
376 cfun->unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
379 /* Tell assembler to switch to unlikely-to-be-executed text section. */
382 unlikely_text_section (void)
386 if (!cfun->unlikely_text_section_name)
387 initialize_cold_section_name ();
389 return get_named_section (NULL, cfun->unlikely_text_section_name, 0);
392 return get_named_section (NULL, UNLIKELY_EXECUTED_TEXT_SECTION_NAME, 0);
395 /* When called within a function context, return true if the function
396 has been assigned a cold text section and if SECT is that section.
397 When called outside a function context, return true if SECT is the
398 default cold section. */
401 unlikely_text_section_p (section *sect)
406 name = cfun->unlikely_text_section_name;
408 name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
412 && (sect->common.flags & SECTION_NAMED) != 0
413 && strcmp (name, sect->named.name) == 0);
416 /* Return a section with a particular name and with whatever SECTION_*
417 flags section_type_flags deems appropriate. The name of the section
418 is taken from NAME if nonnull, otherwise it is taken from DECL's
419 DECL_SECTION_NAME. DECL is the decl associated with the section
420 (see the section comment for details) and RELOC is as for
421 section_type_flags. */
424 get_named_section (tree decl, const char *name, int reloc)
428 gcc_assert (!decl || DECL_P (decl));
430 name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
432 flags = targetm.section_type_flags (decl, name, reloc);
434 return get_section (name, flags, decl);
437 /* If required, set DECL_SECTION_NAME to a unique name. */
440 resolve_unique_section (tree decl, int reloc ATTRIBUTE_UNUSED,
441 int flag_function_or_data_sections)
443 if (DECL_SECTION_NAME (decl) == NULL_TREE
444 && targetm.have_named_sections
445 && (flag_function_or_data_sections
446 || DECL_ONE_ONLY (decl)))
447 targetm.asm_out.unique_section (decl, reloc);
450 #ifdef BSS_SECTION_ASM_OP
452 #ifdef ASM_OUTPUT_BSS
454 /* Utility function for ASM_OUTPUT_BSS for targets to use if
455 they don't support alignments in .bss.
456 ??? It is believed that this function will work in most cases so such
457 support is localized here. */
460 asm_output_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
462 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
463 unsigned HOST_WIDE_INT rounded)
465 targetm.asm_out.globalize_label (file, name);
466 switch_to_section (bss_section);
467 #ifdef ASM_DECLARE_OBJECT_NAME
468 last_assemble_variable_decl = decl;
469 ASM_DECLARE_OBJECT_NAME (file, name, decl);
471 /* Standard thing is just output label for the object. */
472 ASM_OUTPUT_LABEL (file, name);
473 #endif /* ASM_DECLARE_OBJECT_NAME */
474 ASM_OUTPUT_SKIP (file, rounded ? rounded : 1);
479 #ifdef ASM_OUTPUT_ALIGNED_BSS
481 /* Utility function for targets to use in implementing
482 ASM_OUTPUT_ALIGNED_BSS.
483 ??? It is believed that this function will work in most cases so such
484 support is localized here. */
487 asm_output_aligned_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
488 const char *name, unsigned HOST_WIDE_INT size,
491 switch_to_section (bss_section);
492 ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
493 #ifdef ASM_DECLARE_OBJECT_NAME
494 last_assemble_variable_decl = decl;
495 ASM_DECLARE_OBJECT_NAME (file, name, decl);
497 /* Standard thing is just output label for the object. */
498 ASM_OUTPUT_LABEL (file, name);
499 #endif /* ASM_DECLARE_OBJECT_NAME */
500 ASM_OUTPUT_SKIP (file, size ? size : 1);
505 #endif /* BSS_SECTION_ASM_OP */
507 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
508 /* Return the hot section for function DECL. Return text_section for
512 hot_function_section (tree decl)
514 if (decl != NULL_TREE
515 && DECL_SECTION_NAME (decl) != NULL_TREE
516 && targetm.have_named_sections)
517 return get_named_section (decl, NULL, 0);
523 /* Return the section for function DECL.
525 If DECL is NULL_TREE, return the text section. We can be passed
526 NULL_TREE under some circumstances by dbxout.c at least. */
529 function_section (tree decl)
533 if (first_function_block_is_cold)
536 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
537 if (decl != NULL_TREE
538 && DECL_SECTION_NAME (decl) != NULL_TREE)
539 return reloc ? unlikely_text_section ()
540 : get_named_section (decl, NULL, 0);
542 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
544 return reloc ? unlikely_text_section () : hot_function_section (decl);
549 current_function_section (void)
551 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
552 if (current_function_decl != NULL_TREE
553 && DECL_SECTION_NAME (current_function_decl) != NULL_TREE)
554 return in_cold_section_p ? unlikely_text_section ()
555 : get_named_section (current_function_decl,
558 return targetm.asm_out.select_section (current_function_decl,
560 DECL_ALIGN (current_function_decl));
562 return (in_cold_section_p
563 ? unlikely_text_section ()
564 : hot_function_section (current_function_decl));
568 /* Return the read-only data section associated with function DECL. */
571 default_function_rodata_section (tree decl)
573 if (decl != NULL_TREE && DECL_SECTION_NAME (decl))
575 const char *name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
577 if (DECL_ONE_ONLY (decl) && HAVE_COMDAT_GROUP)
579 size_t len = strlen (name) + 3;
580 char* rname = alloca (len);
582 strcpy (rname, ".rodata");
583 strcat (rname, name + 5);
584 return get_section (rname, SECTION_LINKONCE, decl);
586 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
587 else if (DECL_ONE_ONLY (decl)
588 && strncmp (name, ".gnu.linkonce.t.", 16) == 0)
590 size_t len = strlen (name) + 1;
591 char *rname = alloca (len);
593 memcpy (rname, name, len);
595 return get_section (rname, SECTION_LINKONCE, decl);
597 /* For .text.foo we want to use .rodata.foo. */
598 else if (flag_function_sections && flag_data_sections
599 && strncmp (name, ".text.", 6) == 0)
601 size_t len = strlen (name) + 1;
602 char *rname = alloca (len + 2);
604 memcpy (rname, ".rodata", 7);
605 memcpy (rname + 7, name + 5, len - 5);
606 return get_section (rname, 0, decl);
610 return readonly_data_section;
613 /* Return the read-only data section associated with function DECL
614 for targets where that section should be always the single
615 readonly data section. */
618 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED)
620 return readonly_data_section;
623 /* Return the section to use for string merging. */
626 mergeable_string_section (tree decl ATTRIBUTE_UNUSED,
627 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
628 unsigned int flags ATTRIBUTE_UNUSED)
630 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
631 && TREE_CODE (decl) == STRING_CST
632 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
634 && TREE_STRING_LENGTH (decl) >= int_size_in_bytes (TREE_TYPE (decl)))
636 enum machine_mode mode;
637 unsigned int modesize;
642 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (decl)));
643 modesize = GET_MODE_BITSIZE (mode);
644 if (modesize >= 8 && modesize <= 256
645 && (modesize & (modesize - 1)) == 0)
647 if (align < modesize)
650 str = TREE_STRING_POINTER (decl);
651 len = TREE_STRING_LENGTH (decl);
652 unit = GET_MODE_SIZE (mode);
654 /* Check for embedded NUL characters. */
655 for (i = 0; i < len; i += unit)
657 for (j = 0; j < unit; j++)
658 if (str[i + j] != '\0')
665 sprintf (name, ".rodata.str%d.%d", modesize / 8,
667 flags |= (modesize / 8) | SECTION_MERGE | SECTION_STRINGS;
668 return get_section (name, flags, NULL);
673 return readonly_data_section;
676 /* Return the section to use for constant merging. */
679 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED,
680 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
681 unsigned int flags ATTRIBUTE_UNUSED)
683 unsigned int modesize = GET_MODE_BITSIZE (mode);
685 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
691 && (align & (align - 1)) == 0)
695 sprintf (name, ".rodata.cst%d", (int) (align / 8));
696 flags |= (align / 8) | SECTION_MERGE;
697 return get_section (name, flags, NULL);
699 return readonly_data_section;
702 /* Given NAME, a putative register name, discard any customary prefixes. */
705 strip_reg_name (const char *name)
707 #ifdef REGISTER_PREFIX
708 if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
709 name += strlen (REGISTER_PREFIX);
711 if (name[0] == '%' || name[0] == '#')
716 /* The user has asked for a DECL to have a particular name. Set (or
717 change) it in such a way that we don't prefix an underscore to
720 set_user_assembler_name (tree decl, const char *name)
722 char *starred = alloca (strlen (name) + 2);
724 strcpy (starred + 1, name);
725 change_decl_assembler_name (decl, get_identifier (starred));
726 SET_DECL_RTL (decl, NULL_RTX);
729 /* Decode an `asm' spec for a declaration as a register name.
730 Return the register number, or -1 if nothing specified,
731 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
732 or -3 if ASMSPEC is `cc' and is not recognized,
733 or -4 if ASMSPEC is `memory' and is not recognized.
734 Accept an exact spelling or a decimal number.
735 Prefixes such as % are optional. */
738 decode_reg_name (const char *asmspec)
744 /* Get rid of confusing prefixes. */
745 asmspec = strip_reg_name (asmspec);
747 /* Allow a decimal number as a "register name". */
748 for (i = strlen (asmspec) - 1; i >= 0; i--)
749 if (! ISDIGIT (asmspec[i]))
751 if (asmspec[0] != 0 && i < 0)
754 if (i < FIRST_PSEUDO_REGISTER && i >= 0)
760 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
762 && ! strcmp (asmspec, strip_reg_name (reg_names[i])))
765 #ifdef ADDITIONAL_REGISTER_NAMES
767 static const struct { const char *const name; const int number; } table[]
768 = ADDITIONAL_REGISTER_NAMES;
770 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
772 && ! strcmp (asmspec, table[i].name))
773 return table[i].number;
775 #endif /* ADDITIONAL_REGISTER_NAMES */
777 if (!strcmp (asmspec, "memory"))
780 if (!strcmp (asmspec, "cc"))
789 /* Return true if it is possible to put DECL in an object_block. */
792 use_blocks_for_decl_p (tree decl)
794 /* Only data DECLs can be placed into object blocks. */
795 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != CONST_DECL)
798 if (TREE_CODE (decl) == VAR_DECL)
800 /* The object must be defined in this translation unit. */
801 if (DECL_EXTERNAL (decl))
804 /* There's no point using object blocks for something that is
805 isolated by definition. */
806 if (DECL_ONE_ONLY (decl))
809 /* Symbols that use .common cannot be put into blocks. */
810 if (DECL_COMMON (decl) && DECL_INITIAL (decl) == NULL)
814 /* We can only calculate block offsets if the decl has a known
816 if (DECL_SIZE_UNIT (decl) == NULL)
818 if (!host_integerp (DECL_SIZE_UNIT (decl), 1))
821 /* Detect decls created by dw2_force_const_mem. Such decls are
822 special because DECL_INITIAL doesn't specify the decl's true value.
823 dw2_output_indirect_constants will instead call assemble_variable
824 with dont_output_data set to 1 and then print the contents itself. */
825 if (DECL_INITIAL (decl) == decl)
831 /* Make sure block symbol SYMBOL is in section SECT, moving it to a
832 different block if necessary. */
835 change_symbol_section (rtx symbol, section *sect)
837 if (sect != SYMBOL_REF_BLOCK (symbol)->sect)
839 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol) < 0);
840 SYMBOL_REF_BLOCK (symbol) = get_block_for_section (sect);
844 /* Return the section into which the given VAR_DECL or CONST_DECL
848 get_variable_section (tree decl)
852 if (DECL_INITIAL (decl) == error_mark_node)
853 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
854 else if (DECL_INITIAL (decl))
855 reloc = compute_reloc_for_constant (DECL_INITIAL (decl));
859 resolve_unique_section (decl, reloc, flag_data_sections);
860 if (IN_NAMED_SECTION (decl))
861 return get_named_section (decl, NULL, reloc);
863 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
866 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
867 have static storage duration. In other words, it should not be an
868 automatic variable, including PARM_DECLs.
870 There is, however, one exception: this function handles variables
871 explicitly placed in a particular register by the user.
873 This is never called for PARM_DECL nodes. */
876 make_decl_rtl (tree decl)
878 const char *name = 0;
882 /* Check that we are not being given an automatic variable. */
883 gcc_assert (TREE_CODE (decl) != PARM_DECL
884 && TREE_CODE (decl) != RESULT_DECL);
886 /* A weak alias has TREE_PUBLIC set but not the other bits. */
887 gcc_assert (TREE_CODE (decl) != VAR_DECL
888 || TREE_STATIC (decl)
889 || TREE_PUBLIC (decl)
890 || DECL_EXTERNAL (decl)
891 || DECL_REGISTER (decl));
893 /* And that we were not given a type or a label. */
894 gcc_assert (TREE_CODE (decl) != TYPE_DECL
895 && TREE_CODE (decl) != LABEL_DECL);
897 /* For a duplicate declaration, we can be called twice on the
898 same DECL node. Don't discard the RTL already made. */
899 if (DECL_RTL_SET_P (decl))
901 /* If the old RTL had the wrong mode, fix the mode. */
903 if (GET_MODE (x) != DECL_MODE (decl))
904 SET_DECL_RTL (decl, adjust_address_nv (x, DECL_MODE (decl), 0));
906 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
909 /* ??? Another way to do this would be to maintain a hashed
910 table of such critters. Instead of adding stuff to a DECL
911 to give certain attributes to it, we could use an external
912 hash map from DECL to set of attributes. */
914 /* Let the target reassign the RTL if it wants.
915 This is necessary, for example, when one machine specific
916 decl attribute overrides another. */
917 targetm.encode_section_info (decl, DECL_RTL (decl), false);
919 /* If the old address was assigned to an object block, see whether
920 that block is still in the right section. */
922 && GET_CODE (XEXP (x, 0)) == SYMBOL_REF
923 && SYMBOL_REF_IN_BLOCK_P (XEXP (x, 0)))
924 change_symbol_section (XEXP (x, 0), get_variable_section (decl));
926 /* Make this function static known to the mudflap runtime. */
927 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
928 mudflap_enqueue_decl (decl);
933 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
935 if (name[0] != '*' && TREE_CODE (decl) != FUNCTION_DECL
936 && DECL_REGISTER (decl))
938 error ("register name not specified for %q+D", decl);
940 else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
942 const char *asmspec = name+1;
943 reg_number = decode_reg_name (asmspec);
944 /* First detect errors in declaring global registers. */
945 if (reg_number == -1)
946 error ("register name not specified for %q+D", decl);
947 else if (reg_number < 0)
948 error ("invalid register name for %q+D", decl);
949 else if (TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
950 error ("data type of %q+D isn%'t suitable for a register",
952 else if (! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl))))
953 error ("register specified for %q+D isn%'t suitable for data type",
955 /* Now handle properly declared static register variables. */
960 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
962 DECL_INITIAL (decl) = 0;
963 error ("global register variable has initial value");
965 if (TREE_THIS_VOLATILE (decl))
966 warning (OPT_Wvolatile_register_var,
967 "optimization may eliminate reads and/or "
968 "writes to register variables");
970 /* If the user specified one of the eliminables registers here,
971 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
972 confused with that register and be eliminated. This usage is
973 somewhat suspect... */
975 SET_DECL_RTL (decl, gen_rtx_raw_REG (DECL_MODE (decl), reg_number));
976 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
977 REG_USERVAR_P (DECL_RTL (decl)) = 1;
979 if (TREE_STATIC (decl))
981 /* Make this register global, so not usable for anything
983 #ifdef ASM_DECLARE_REGISTER_GLOBAL
984 name = IDENTIFIER_POINTER (DECL_NAME (decl));
985 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
987 nregs = hard_regno_nregs[reg_number][DECL_MODE (decl)];
989 globalize_reg (reg_number + --nregs);
992 /* As a register variable, it has no section. */
996 /* Now handle ordinary static variables and functions (in memory).
997 Also handle vars declared register invalidly. */
998 else if (name[0] == '*')
1000 #ifdef REGISTER_PREFIX
1001 if (strlen (REGISTER_PREFIX) != 0)
1003 reg_number = decode_reg_name (name);
1004 if (reg_number >= 0 || reg_number == -3)
1005 error ("register name given for non-register variable %q+D", decl);
1010 /* Specifying a section attribute on a variable forces it into a
1011 non-.bss section, and thus it cannot be common. */
1012 if (TREE_CODE (decl) == VAR_DECL
1013 && DECL_SECTION_NAME (decl) != NULL_TREE
1014 && DECL_INITIAL (decl) == NULL_TREE
1015 && DECL_COMMON (decl))
1016 DECL_COMMON (decl) = 0;
1018 /* Variables can't be both common and weak. */
1019 if (TREE_CODE (decl) == VAR_DECL && DECL_WEAK (decl))
1020 DECL_COMMON (decl) = 0;
1022 if (use_object_blocks_p () && use_blocks_for_decl_p (decl))
1024 section *sect = get_variable_section (decl);
1025 x = create_block_symbol (name, get_block_for_section (sect), -1);
1028 x = gen_rtx_SYMBOL_REF (Pmode, name);
1029 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
1030 SET_SYMBOL_REF_DECL (x, decl);
1032 x = gen_rtx_MEM (DECL_MODE (decl), x);
1033 if (TREE_CODE (decl) != FUNCTION_DECL)
1034 set_mem_attributes (x, decl, 1);
1035 SET_DECL_RTL (decl, x);
1037 /* Optionally set flags or add text to the name to record information
1038 such as that it is a function name.
1039 If the name is changed, the macro ASM_OUTPUT_LABELREF
1040 will have to know how to strip this information. */
1041 targetm.encode_section_info (decl, DECL_RTL (decl), true);
1043 /* Make this function static known to the mudflap runtime. */
1044 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1045 mudflap_enqueue_decl (decl);
1048 /* Make the rtl for variable VAR be volatile.
1049 Use this only for static variables. */
1052 make_var_volatile (tree var)
1054 gcc_assert (MEM_P (DECL_RTL (var)));
1056 MEM_VOLATILE_P (DECL_RTL (var)) = 1;
1059 /* Output a string of literal assembler code
1060 for an `asm' keyword used between functions. */
1063 assemble_asm (tree string)
1067 if (TREE_CODE (string) == ADDR_EXPR)
1068 string = TREE_OPERAND (string, 0);
1070 fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string));
1073 /* Record an element in the table of global destructors. SYMBOL is
1074 a SYMBOL_REF of the function to be called; PRIORITY is a number
1075 between 0 and MAX_INIT_PRIORITY. */
1078 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED,
1079 int priority ATTRIBUTE_UNUSED)
1081 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1082 /* Tell GNU LD that this is part of the static destructor set.
1083 This will work for any system that uses stabs, most usefully
1085 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1086 dbxout_stab_value_label (XSTR (symbol, 0));
1088 sorry ("global destructors not supported on this target");
1093 default_named_section_asm_out_destructor (rtx symbol, int priority)
1095 const char *section = ".dtors";
1098 /* ??? This only works reliably with the GNU linker. */
1099 if (priority != DEFAULT_INIT_PRIORITY)
1101 sprintf (buf, ".dtors.%.5u",
1102 /* Invert the numbering so the linker puts us in the proper
1103 order; constructors are run from right to left, and the
1104 linker sorts in increasing order. */
1105 MAX_INIT_PRIORITY - priority);
1109 switch_to_section (get_section (section, SECTION_WRITE, NULL));
1110 assemble_align (POINTER_SIZE);
1111 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1114 #ifdef DTORS_SECTION_ASM_OP
1116 default_dtor_section_asm_out_destructor (rtx symbol,
1117 int priority ATTRIBUTE_UNUSED)
1119 switch_to_section (dtors_section);
1120 assemble_align (POINTER_SIZE);
1121 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1125 /* Likewise for global constructors. */
1128 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED,
1129 int priority ATTRIBUTE_UNUSED)
1131 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1132 /* Tell GNU LD that this is part of the static destructor set.
1133 This will work for any system that uses stabs, most usefully
1135 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1136 dbxout_stab_value_label (XSTR (symbol, 0));
1138 sorry ("global constructors not supported on this target");
1143 default_named_section_asm_out_constructor (rtx symbol, int priority)
1145 const char *section = ".ctors";
1148 /* ??? This only works reliably with the GNU linker. */
1149 if (priority != DEFAULT_INIT_PRIORITY)
1151 sprintf (buf, ".ctors.%.5u",
1152 /* Invert the numbering so the linker puts us in the proper
1153 order; constructors are run from right to left, and the
1154 linker sorts in increasing order. */
1155 MAX_INIT_PRIORITY - priority);
1159 switch_to_section (get_section (section, SECTION_WRITE, NULL));
1160 assemble_align (POINTER_SIZE);
1161 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1164 #ifdef CTORS_SECTION_ASM_OP
1166 default_ctor_section_asm_out_constructor (rtx symbol,
1167 int priority ATTRIBUTE_UNUSED)
1169 switch_to_section (ctors_section);
1170 assemble_align (POINTER_SIZE);
1171 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1175 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1176 a nonzero value if the constant pool should be output before the
1177 start of the function, or a zero value if the pool should output
1178 after the end of the function. The default is to put it before the
1181 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1182 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1185 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1186 to be output to assembler.
1187 Set first_global_object_name and weak_global_object_name as appropriate. */
1190 notice_global_symbol (tree decl)
1192 const char **type = &first_global_object_name;
1194 if (first_global_object_name
1195 || !TREE_PUBLIC (decl) || DECL_EXTERNAL (decl)
1196 || !DECL_NAME (decl)
1197 || (TREE_CODE (decl) != FUNCTION_DECL
1198 && (TREE_CODE (decl) != VAR_DECL
1199 || (DECL_COMMON (decl)
1200 && (DECL_INITIAL (decl) == 0
1201 || DECL_INITIAL (decl) == error_mark_node))))
1202 || !MEM_P (DECL_RTL (decl)))
1205 /* We win when global object is found, but it is useful to know about weak
1206 symbol as well so we can produce nicer unique names. */
1207 if (DECL_WEAK (decl) || DECL_ONE_ONLY (decl))
1208 type = &weak_global_object_name;
1214 rtx decl_rtl = DECL_RTL (decl);
1216 p = targetm.strip_name_encoding (XSTR (XEXP (decl_rtl, 0), 0));
1217 name = ggc_strdup (p);
1223 /* Output assembler code for the constant pool of a function and associated
1224 with defining the name of the function. DECL describes the function.
1225 NAME is the function's name. For the constant pool, we use the current
1226 constant pool data. */
1229 assemble_start_function (tree decl, const char *fnname)
1232 char tmp_label[100];
1233 bool hot_label_written = false;
1235 cfun->unlikely_text_section_name = NULL;
1237 first_function_block_is_cold = false;
1238 if (flag_reorder_blocks_and_partition)
1240 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
1241 cfun->hot_section_label = ggc_strdup (tmp_label);
1242 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDB", const_labelno);
1243 cfun->cold_section_label = ggc_strdup (tmp_label);
1244 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTE", const_labelno);
1245 cfun->hot_section_end_label = ggc_strdup (tmp_label);
1246 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDE", const_labelno);
1247 cfun->cold_section_end_label = ggc_strdup (tmp_label);
1252 cfun->hot_section_label = NULL;
1253 cfun->cold_section_label = NULL;
1254 cfun->hot_section_end_label = NULL;
1255 cfun->cold_section_end_label = NULL;
1258 /* The following code does not need preprocessing in the assembler. */
1262 if (CONSTANT_POOL_BEFORE_FUNCTION)
1263 output_constant_pool (fnname, decl);
1265 resolve_unique_section (decl, 0, flag_function_sections);
1267 /* Make sure the not and cold text (code) sections are properly
1268 aligned. This is necessary here in the case where the function
1269 has both hot and cold sections, because we don't want to re-set
1270 the alignment when the section switch happens mid-function. */
1272 if (flag_reorder_blocks_and_partition)
1274 switch_to_section (unlikely_text_section ());
1275 assemble_align (FUNCTION_BOUNDARY);
1276 ASM_OUTPUT_LABEL (asm_out_file, cfun->cold_section_label);
1278 /* When the function starts with a cold section, we need to explicitly
1279 align the hot section and write out the hot section label.
1280 But if the current function is a thunk, we do not have a CFG. */
1281 if (!current_function_is_thunk
1282 && BB_PARTITION (ENTRY_BLOCK_PTR->next_bb) == BB_COLD_PARTITION)
1284 switch_to_section (text_section);
1285 assemble_align (FUNCTION_BOUNDARY);
1286 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_label);
1287 hot_label_written = true;
1288 first_function_block_is_cold = true;
1291 else if (DECL_SECTION_NAME (decl))
1293 /* Calls to function_section rely on first_function_block_is_cold
1294 being accurate. The first block may be cold even if we aren't
1295 doing partitioning, if the entire function was decided by
1296 choose_function_section (predict.c) to be cold. */
1298 initialize_cold_section_name ();
1300 if (cfun->unlikely_text_section_name
1301 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
1302 cfun->unlikely_text_section_name) == 0)
1303 first_function_block_is_cold = true;
1306 in_cold_section_p = first_function_block_is_cold;
1308 /* Switch to the correct text section for the start of the function. */
1310 switch_to_section (function_section (decl));
1311 if (flag_reorder_blocks_and_partition
1312 && !hot_label_written)
1313 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_label);
1315 /* Tell assembler to move to target machine's alignment for functions. */
1316 align = floor_log2 (FUNCTION_BOUNDARY / BITS_PER_UNIT);
1317 if (align < force_align_functions_log)
1318 align = force_align_functions_log;
1321 ASM_OUTPUT_ALIGN (asm_out_file, align);
1324 /* Handle a user-specified function alignment.
1325 Note that we still need to align to FUNCTION_BOUNDARY, as above,
1326 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1327 if (align_functions_log > align
1328 && cfun->function_frequency != FUNCTION_FREQUENCY_UNLIKELY_EXECUTED)
1330 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1331 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
1332 align_functions_log, align_functions - 1);
1334 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1338 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1339 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1342 (*debug_hooks->begin_function) (decl);
1344 /* Make function name accessible from other files, if appropriate. */
1346 if (TREE_PUBLIC (decl))
1348 notice_global_symbol (decl);
1350 globalize_decl (decl);
1352 maybe_assemble_visibility (decl);
1355 if (DECL_PRESERVE_P (decl))
1356 targetm.asm_out.mark_decl_preserved (fnname);
1358 /* Do any machine/system dependent processing of the function name. */
1359 #ifdef ASM_DECLARE_FUNCTION_NAME
1360 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1362 /* Standard thing is just output label for the function. */
1363 ASM_OUTPUT_LABEL (asm_out_file, fnname);
1364 #endif /* ASM_DECLARE_FUNCTION_NAME */
1367 /* Output assembler code associated with defining the size of the
1368 function. DECL describes the function. NAME is the function's name. */
1371 assemble_end_function (tree decl, const char *fnname)
1373 #ifdef ASM_DECLARE_FUNCTION_SIZE
1374 /* We could have switched section in the middle of the function. */
1375 if (flag_reorder_blocks_and_partition)
1376 switch_to_section (function_section (decl));
1377 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1379 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1381 output_constant_pool (fnname, decl);
1382 switch_to_section (function_section (decl)); /* need to switch back */
1384 /* Output labels for end of hot/cold text sections (to be used by
1386 if (flag_reorder_blocks_and_partition)
1388 section *save_text_section;
1390 save_text_section = in_section;
1391 switch_to_section (unlikely_text_section ());
1392 ASM_OUTPUT_LABEL (asm_out_file, cfun->cold_section_end_label);
1393 if (first_function_block_is_cold)
1394 switch_to_section (text_section);
1396 switch_to_section (function_section (decl));
1397 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_end_label);
1398 switch_to_section (save_text_section);
1402 /* Assemble code to leave SIZE bytes of zeros. */
1405 assemble_zeros (unsigned HOST_WIDE_INT size)
1407 /* Do no output if -fsyntax-only. */
1408 if (flag_syntax_only)
1411 #ifdef ASM_NO_SKIP_IN_TEXT
1412 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1413 so we must output 0s explicitly in the text section. */
1414 if (ASM_NO_SKIP_IN_TEXT && (in_section->common.flags & SECTION_CODE) != 0)
1416 unsigned HOST_WIDE_INT i;
1417 for (i = 0; i < size; i++)
1418 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1423 ASM_OUTPUT_SKIP (asm_out_file, size);
1426 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1429 assemble_align (int align)
1431 if (align > BITS_PER_UNIT)
1433 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1437 /* Assemble a string constant with the specified C string as contents. */
1440 assemble_string (const char *p, int size)
1445 /* If the string is very long, split it up. */
1449 int thissize = size - pos;
1450 if (thissize > maximum)
1453 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1461 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1462 #define ASM_EMIT_LOCAL(decl, name, size, rounded) \
1463 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name, size, DECL_ALIGN (decl))
1465 #if defined ASM_OUTPUT_ALIGNED_LOCAL
1466 #define ASM_EMIT_LOCAL(decl, name, size, rounded) \
1467 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, DECL_ALIGN (decl))
1469 #define ASM_EMIT_LOCAL(decl, name, size, rounded) \
1470 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded)
1474 #if defined ASM_OUTPUT_ALIGNED_BSS
1475 #define ASM_EMIT_BSS(decl, name, size, rounded) \
1476 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size, DECL_ALIGN (decl))
1478 #if defined ASM_OUTPUT_BSS
1479 #define ASM_EMIT_BSS(decl, name, size, rounded) \
1480 ASM_OUTPUT_BSS (asm_out_file, decl, name, size, rounded)
1486 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1487 #define ASM_EMIT_COMMON(decl, name, size, rounded) \
1488 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name, size, DECL_ALIGN (decl))
1490 #if defined ASM_OUTPUT_ALIGNED_COMMON
1491 #define ASM_EMIT_COMMON(decl, name, size, rounded) \
1492 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, DECL_ALIGN (decl))
1494 #define ASM_EMIT_COMMON(decl, name, size, rounded) \
1495 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded)
1500 asm_emit_uninitialised (tree decl, const char *name,
1501 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1502 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1510 destination = asm_dest_local;
1512 /* ??? We should handle .bss via select_section mechanisms rather than
1513 via special target hooks. That would eliminate this special case. */
1514 if (TREE_PUBLIC (decl))
1516 if (!DECL_COMMON (decl))
1518 destination = asm_dest_bss;
1523 destination = asm_dest_common;
1526 if (destination != asm_dest_common)
1528 resolve_unique_section (decl, 0, flag_data_sections);
1529 /* Custom sections don't belong here. */
1530 if (DECL_SECTION_NAME (decl))
1534 if (destination == asm_dest_bss)
1535 globalize_decl (decl);
1537 switch (destination)
1541 ASM_EMIT_BSS (decl, name, size, rounded);
1544 case asm_dest_common:
1545 ASM_EMIT_COMMON (decl, name, size, rounded);
1547 case asm_dest_local:
1548 ASM_EMIT_LOCAL (decl, name, size, rounded);
1557 /* A subroutine of assemble_variable. Output the label and contents of
1558 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1559 is as for assemble_variable. */
1562 assemble_variable_contents (tree decl, const char *name,
1563 bool dont_output_data)
1565 /* Do any machine/system dependent processing of the object. */
1566 #ifdef ASM_DECLARE_OBJECT_NAME
1567 last_assemble_variable_decl = decl;
1568 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
1570 /* Standard thing is just output label for the object. */
1571 ASM_OUTPUT_LABEL (asm_out_file, name);
1572 #endif /* ASM_DECLARE_OBJECT_NAME */
1574 if (!dont_output_data)
1576 if (DECL_INITIAL (decl)
1577 && DECL_INITIAL (decl) != error_mark_node
1578 && !initializer_zerop (DECL_INITIAL (decl)))
1579 /* Output the actual data. */
1580 output_constant (DECL_INITIAL (decl),
1581 tree_low_cst (DECL_SIZE_UNIT (decl), 1),
1584 /* Leave space for it. */
1585 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl), 1));
1589 /* Assemble everything that is needed for a variable or function declaration.
1590 Not used for automatic variables, and not used for function definitions.
1591 Should not be called for variables of incomplete structure type.
1593 TOP_LEVEL is nonzero if this variable has file scope.
1594 AT_END is nonzero if this is the special handling, at end of compilation,
1595 to define things that have had only tentative definitions.
1596 DONT_OUTPUT_DATA if nonzero means don't actually output the
1597 initial value (that will be done by the caller). */
1600 assemble_variable (tree decl, int top_level ATTRIBUTE_UNUSED,
1601 int at_end ATTRIBUTE_UNUSED, int dont_output_data)
1608 if (lang_hooks.decls.prepare_assemble_variable)
1609 lang_hooks.decls.prepare_assemble_variable (decl);
1611 last_assemble_variable_decl = 0;
1613 /* Normally no need to say anything here for external references,
1614 since assemble_external is called by the language-specific code
1615 when a declaration is first seen. */
1617 if (DECL_EXTERNAL (decl))
1620 /* Output no assembler code for a function declaration.
1621 Only definitions of functions output anything. */
1623 if (TREE_CODE (decl) == FUNCTION_DECL)
1626 /* Do nothing for global register variables. */
1627 if (DECL_RTL_SET_P (decl) && REG_P (DECL_RTL (decl)))
1629 TREE_ASM_WRITTEN (decl) = 1;
1633 /* If type was incomplete when the variable was declared,
1634 see if it is complete now. */
1636 if (DECL_SIZE (decl) == 0)
1637 layout_decl (decl, 0);
1639 /* Still incomplete => don't allocate it; treat the tentative defn
1640 (which is what it must have been) as an `extern' reference. */
1642 if (!dont_output_data && DECL_SIZE (decl) == 0)
1644 error ("storage size of %q+D isn%'t known", decl);
1645 TREE_ASM_WRITTEN (decl) = 1;
1649 /* The first declaration of a variable that comes through this function
1650 decides whether it is global (in C, has external linkage)
1651 or local (in C, has internal linkage). So do nothing more
1652 if this function has already run. */
1654 if (TREE_ASM_WRITTEN (decl))
1657 /* Make sure targetm.encode_section_info is invoked before we set
1659 decl_rtl = DECL_RTL (decl);
1661 TREE_ASM_WRITTEN (decl) = 1;
1663 /* Do no output if -fsyntax-only. */
1664 if (flag_syntax_only)
1669 if (! dont_output_data
1670 && ! host_integerp (DECL_SIZE_UNIT (decl), 1))
1672 error ("size of variable %q+D is too large", decl);
1676 gcc_assert (MEM_P (decl_rtl));
1677 gcc_assert (GET_CODE (XEXP (decl_rtl, 0)) == SYMBOL_REF);
1678 in_block_p = SYMBOL_REF_IN_BLOCK_P (XEXP (decl_rtl, 0));
1679 name = XSTR (XEXP (decl_rtl, 0), 0);
1680 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
1681 notice_global_symbol (decl);
1683 /* Compute the alignment of this data. */
1685 align = DECL_ALIGN (decl);
1687 /* In the case for initialing an array whose length isn't specified,
1688 where we have not yet been able to do the layout,
1689 figure out the proper alignment now. */
1690 if (dont_output_data && DECL_SIZE (decl) == 0
1691 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
1692 align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
1694 /* Some object file formats have a maximum alignment which they support.
1695 In particular, a.out format supports a maximum alignment of 4. */
1696 if (align > MAX_OFILE_ALIGNMENT)
1698 warning (0, "alignment of %q+D is greater than maximum object "
1699 "file alignment. Using %d", decl,
1700 MAX_OFILE_ALIGNMENT/BITS_PER_UNIT);
1701 align = MAX_OFILE_ALIGNMENT;
1704 /* On some machines, it is good to increase alignment sometimes. */
1705 if (! DECL_USER_ALIGN (decl))
1707 #ifdef DATA_ALIGNMENT
1708 align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
1710 #ifdef CONSTANT_ALIGNMENT
1711 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
1712 align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl), align);
1716 /* Reset the alignment in case we have made it tighter, so we can benefit
1717 from it in get_pointer_alignment. */
1718 DECL_ALIGN (decl) = align;
1719 set_mem_align (decl_rtl, align);
1721 if (TREE_PUBLIC (decl))
1722 maybe_assemble_visibility (decl);
1724 if (DECL_PRESERVE_P (decl))
1725 targetm.asm_out.mark_decl_preserved (name);
1727 /* Handle uninitialized definitions. */
1729 /* If the decl has been given an explicit section name, then it
1730 isn't common, and shouldn't be handled as such. */
1731 if (DECL_SECTION_NAME (decl) || dont_output_data)
1733 else if (DECL_THREAD_LOCAL_P (decl))
1735 if (DECL_COMMON (decl))
1737 #ifdef ASM_OUTPUT_TLS_COMMON
1738 unsigned HOST_WIDE_INT size;
1740 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
1741 ASM_OUTPUT_TLS_COMMON (asm_out_file, decl, name, size);
1744 sorry ("thread-local COMMON data not implemented");
1748 /* Do not handle decls as common if they will be assigned a
1749 specific section position. */
1750 else if (in_block_p)
1752 else if (DECL_INITIAL (decl) == 0
1753 || DECL_INITIAL (decl) == error_mark_node
1754 || (flag_zero_initialized_in_bss
1755 /* Leave constant zeroes in .rodata so they can be shared. */
1756 && !TREE_READONLY (decl)
1757 && initializer_zerop (DECL_INITIAL (decl))))
1759 unsigned HOST_WIDE_INT size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
1760 unsigned HOST_WIDE_INT rounded = size;
1762 /* Don't allocate zero bytes of common,
1763 since that means "undefined external" in the linker. */
1767 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1768 so that each uninitialized object starts on such a boundary. */
1769 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
1770 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1771 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1773 #if !defined(ASM_OUTPUT_ALIGNED_COMMON) && !defined(ASM_OUTPUT_ALIGNED_DECL_COMMON) && !defined(ASM_OUTPUT_ALIGNED_BSS)
1774 if ((unsigned HOST_WIDE_INT) DECL_ALIGN_UNIT (decl) > rounded)
1775 warning (0, "requested alignment for %q+D is greater than "
1776 "implemented alignment of %wu", decl, rounded);
1779 /* If the target cannot output uninitialized but not common global data
1780 in .bss, then we have to use .data, so fall through. */
1781 if (asm_emit_uninitialised (decl, name, size, rounded))
1785 /* Handle initialized definitions.
1786 Also handle uninitialized global definitions if -fno-common and the
1787 target doesn't support ASM_OUTPUT_BSS. */
1789 /* First make the assembler name(s) global if appropriate. */
1790 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
1791 globalize_decl (decl);
1793 /* Output any data that we will need to use the address of. */
1794 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
1795 output_addressed_constants (DECL_INITIAL (decl));
1797 /* dbxout.c needs to know this. */
1798 if (in_section && (in_section->common.flags & SECTION_CODE) != 0)
1799 DECL_IN_TEXT_SECTION (decl) = 1;
1801 /* If the decl is part of an object_block, make sure that the decl
1802 has been positioned within its block, but do not write out its
1803 definition yet. output_object_blocks will do that later. */
1806 gcc_assert (!dont_output_data);
1807 place_block_symbol (XEXP (decl_rtl, 0));
1811 switch_to_section (get_variable_section (decl));
1812 if (align > BITS_PER_UNIT)
1813 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (DECL_ALIGN_UNIT (decl)));
1814 assemble_variable_contents (decl, name, dont_output_data);
1818 /* Return 1 if type TYPE contains any pointers. */
1821 contains_pointers_p (tree type)
1823 switch (TREE_CODE (type))
1826 case REFERENCE_TYPE:
1827 /* I'm not sure whether OFFSET_TYPE needs this treatment,
1828 so I'll play safe and return 1. */
1834 case QUAL_UNION_TYPE:
1837 /* For a type that has fields, see if the fields have pointers. */
1838 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
1839 if (TREE_CODE (fields) == FIELD_DECL
1840 && contains_pointers_p (TREE_TYPE (fields)))
1846 /* An array type contains pointers if its element type does. */
1847 return contains_pointers_p (TREE_TYPE (type));
1854 /* In unit-at-a-time mode, we delay assemble_external processing until
1855 the compilation unit is finalized. This is the best we can do for
1856 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
1857 it all the way to final. See PR 17982 for further discussion. */
1858 static GTY(()) tree pending_assemble_externals;
1860 #ifdef ASM_OUTPUT_EXTERNAL
1861 /* True if DECL is a function decl for which no out-of-line copy exists.
1862 It is assumed that DECL's assembler name has been set. */
1865 incorporeal_function_p (tree decl)
1867 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1871 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
1872 && DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA)
1875 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1876 if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0)
1882 /* Actually do the tests to determine if this is necessary, and invoke
1883 ASM_OUTPUT_EXTERNAL. */
1885 assemble_external_real (tree decl)
1887 rtx rtl = DECL_RTL (decl);
1889 if (MEM_P (rtl) && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
1890 && !SYMBOL_REF_USED (XEXP (rtl, 0))
1891 && !incorporeal_function_p (decl))
1893 /* Some systems do require some output. */
1894 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
1895 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
1901 process_pending_assemble_externals (void)
1903 #ifdef ASM_OUTPUT_EXTERNAL
1905 for (list = pending_assemble_externals; list; list = TREE_CHAIN (list))
1906 assemble_external_real (TREE_VALUE (list));
1908 pending_assemble_externals = 0;
1912 /* Output something to declare an external symbol to the assembler.
1913 (Most assemblers don't need this, so we normally output nothing.)
1914 Do nothing if DECL is not external. */
1917 assemble_external (tree decl ATTRIBUTE_UNUSED)
1919 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
1920 main body of this code is only rarely exercised. To provide some
1921 testing, on all platforms, we make sure that the ASM_OUT_FILE is
1922 open. If it's not, we should not be calling this function. */
1923 gcc_assert (asm_out_file);
1925 #ifdef ASM_OUTPUT_EXTERNAL
1926 if (!DECL_P (decl) || !DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
1929 if (flag_unit_at_a_time)
1930 pending_assemble_externals = tree_cons (0, decl,
1931 pending_assemble_externals);
1933 assemble_external_real (decl);
1937 /* Similar, for calling a library function FUN. */
1940 assemble_external_libcall (rtx fun)
1942 /* Declare library function name external when first used, if nec. */
1943 if (! SYMBOL_REF_USED (fun))
1945 SYMBOL_REF_USED (fun) = 1;
1946 targetm.asm_out.external_libcall (fun);
1950 /* Assemble a label named NAME. */
1953 assemble_label (const char *name)
1955 ASM_OUTPUT_LABEL (asm_out_file, name);
1958 /* Set the symbol_referenced flag for ID. */
1960 mark_referenced (tree id)
1962 TREE_SYMBOL_REFERENCED (id) = 1;
1965 /* Set the symbol_referenced flag for DECL and notify callgraph. */
1967 mark_decl_referenced (tree decl)
1969 if (TREE_CODE (decl) == FUNCTION_DECL)
1971 /* Extern inline functions don't become needed when referenced.
1972 If we know a method will be emitted in other TU and no new
1973 functions can be marked reachable, just use the external
1975 struct cgraph_node *node = cgraph_node (decl);
1976 if (!DECL_EXTERNAL (decl)
1977 && (!node->local.vtable_method || !cgraph_global_info_ready
1978 || !node->local.finalized))
1979 cgraph_mark_needed_node (node);
1981 else if (TREE_CODE (decl) == VAR_DECL)
1983 struct cgraph_varpool_node *node = cgraph_varpool_node (decl);
1984 cgraph_varpool_mark_needed_node (node);
1985 /* C++ frontend use mark_decl_references to force COMDAT variables
1986 to be output that might appear dead otherwise. */
1987 node->force_output = true;
1989 /* else do nothing - we can get various sorts of CST nodes here,
1990 which do not need to be marked. */
1994 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1995 until we find an identifier that is not itself a transparent alias.
1996 Modify the alias passed to it by reference (and all aliases on the
1997 way to the ultimate target), such that they do not have to be
1998 followed again, and return the ultimate target of the alias
2002 ultimate_transparent_alias_target (tree *alias)
2004 tree target = *alias;
2006 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
2008 gcc_assert (TREE_CHAIN (target));
2009 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
2010 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
2011 && ! TREE_CHAIN (target));
2018 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2019 starts with a *, the rest of NAME is output verbatim. Otherwise
2020 NAME is transformed in a target-specific way (usually by the
2021 addition of an underscore). */
2024 assemble_name_raw (FILE *file, const char *name)
2027 fputs (&name[1], file);
2029 ASM_OUTPUT_LABELREF (file, name);
2032 /* Like assemble_name_raw, but should be used when NAME might refer to
2033 an entity that is also represented as a tree (like a function or
2034 variable). If NAME does refer to such an entity, that entity will
2035 be marked as referenced. */
2038 assemble_name (FILE *file, const char *name)
2040 const char *real_name;
2043 real_name = targetm.strip_name_encoding (name);
2045 id = maybe_get_identifier (real_name);
2050 mark_referenced (id);
2051 ultimate_transparent_alias_target (&id);
2053 name = IDENTIFIER_POINTER (id);
2054 gcc_assert (! TREE_CHAIN (id));
2057 assemble_name_raw (file, name);
2060 /* Allocate SIZE bytes writable static space with a gensym name
2061 and return an RTX to refer to its address. */
2064 assemble_static_space (unsigned HOST_WIDE_INT size)
2067 const char *namestring;
2070 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2072 namestring = ggc_strdup (name);
2074 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2075 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2077 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2078 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2081 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2082 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2085 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2086 so that each uninitialized object starts on such a boundary. */
2087 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2088 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2089 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2090 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2091 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2092 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2099 /* Assemble the static constant template for function entry trampolines.
2100 This is done at most once per compilation.
2101 Returns an RTX for the address of the template. */
2103 static GTY(()) rtx initial_trampoline;
2105 #ifdef TRAMPOLINE_TEMPLATE
2107 assemble_trampoline_template (void)
2114 if (initial_trampoline)
2115 return initial_trampoline;
2117 /* By default, put trampoline templates in read-only data section. */
2119 #ifdef TRAMPOLINE_SECTION
2120 switch_to_section (TRAMPOLINE_SECTION);
2122 switch_to_section (readonly_data_section);
2125 /* Write the assembler code to define one. */
2126 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2129 ASM_OUTPUT_ALIGN (asm_out_file, align);
2132 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2133 TRAMPOLINE_TEMPLATE (asm_out_file);
2135 /* Record the rtl to refer to it. */
2136 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2137 name = ggc_strdup (label);
2138 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2139 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2141 initial_trampoline = gen_rtx_MEM (BLKmode, symbol);
2142 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2144 return initial_trampoline;
2148 /* A and B are either alignments or offsets. Return the minimum alignment
2149 that may be assumed after adding the two together. */
2151 static inline unsigned
2152 min_align (unsigned int a, unsigned int b)
2154 return (a | b) & -(a | b);
2157 /* Return the assembler directive for creating a given kind of integer
2158 object. SIZE is the number of bytes in the object and ALIGNED_P
2159 indicates whether it is known to be aligned. Return NULL if the
2160 assembly dialect has no such directive.
2162 The returned string should be printed at the start of a new line and
2163 be followed immediately by the object's initial value. */
2166 integer_asm_op (int size, int aligned_p)
2168 struct asm_int_op *ops;
2171 ops = &targetm.asm_out.aligned_op;
2173 ops = &targetm.asm_out.unaligned_op;
2178 return targetm.asm_out.byte_op;
2192 /* Use directive OP to assemble an integer object X. Print OP at the
2193 start of the line, followed immediately by the value of X. */
2196 assemble_integer_with_op (const char *op, rtx x)
2198 fputs (op, asm_out_file);
2199 output_addr_const (asm_out_file, x);
2200 fputc ('\n', asm_out_file);
2203 /* The default implementation of the asm_out.integer target hook. */
2206 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2207 unsigned int size ATTRIBUTE_UNUSED,
2208 int aligned_p ATTRIBUTE_UNUSED)
2210 const char *op = integer_asm_op (size, aligned_p);
2211 /* Avoid GAS bugs for large values. Specifically negative values whose
2212 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2213 if (size > UNITS_PER_WORD && size > POINTER_SIZE / BITS_PER_UNIT)
2215 return op && (assemble_integer_with_op (op, x), true);
2218 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2219 the alignment of the integer in bits. Return 1 if we were able to output
2220 the constant, otherwise 0. We must be able to output the constant,
2221 if FORCE is nonzero. */
2224 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2228 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2230 /* See if the target hook can handle this kind of object. */
2231 if (targetm.asm_out.integer (x, size, aligned_p))
2234 /* If the object is a multi-byte one, try splitting it up. Split
2235 it into words it if is multi-word, otherwise split it into bytes. */
2238 enum machine_mode omode, imode;
2239 unsigned int subalign;
2240 unsigned int subsize, i;
2242 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2243 subalign = MIN (align, subsize * BITS_PER_UNIT);
2244 omode = mode_for_size (subsize * BITS_PER_UNIT, MODE_INT, 0);
2245 imode = mode_for_size (size * BITS_PER_UNIT, MODE_INT, 0);
2247 for (i = 0; i < size; i += subsize)
2249 rtx partial = simplify_subreg (omode, x, imode, i);
2250 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2256 /* If we've printed some of it, but not all of it, there's no going
2261 gcc_assert (!force);
2267 assemble_real (REAL_VALUE_TYPE d, enum machine_mode mode, unsigned int align)
2269 long data[4] = {0, 0, 0, 0};
2271 int bitsize, nelts, nunits, units_per;
2273 /* This is hairy. We have a quantity of known size. real_to_target
2274 will put it into an array of *host* longs, 32 bits per element
2275 (even if long is more than 32 bits). We need to determine the
2276 number of array elements that are occupied (nelts) and the number
2277 of *target* min-addressable units that will be occupied in the
2278 object file (nunits). We cannot assume that 32 divides the
2279 mode's bitsize (size * BITS_PER_UNIT) evenly.
2281 size * BITS_PER_UNIT is used here to make sure that padding bits
2282 (which might appear at either end of the value; real_to_target
2283 will include the padding bits in its output array) are included. */
2285 nunits = GET_MODE_SIZE (mode);
2286 bitsize = nunits * BITS_PER_UNIT;
2287 nelts = CEIL (bitsize, 32);
2288 units_per = 32 / BITS_PER_UNIT;
2290 real_to_target (data, &d, mode);
2292 /* Put out the first word with the specified alignment. */
2293 assemble_integer (GEN_INT (data[0]), MIN (nunits, units_per), align, 1);
2294 nunits -= units_per;
2296 /* Subsequent words need only 32-bit alignment. */
2297 align = min_align (align, 32);
2299 for (i = 1; i < nelts; i++)
2301 assemble_integer (GEN_INT (data[i]), MIN (nunits, units_per), align, 1);
2302 nunits -= units_per;
2306 /* Given an expression EXP with a constant value,
2307 reduce it to the sum of an assembler symbol and an integer.
2308 Store them both in the structure *VALUE.
2309 EXP must be reducible. */
2311 struct addr_const GTY(())
2314 HOST_WIDE_INT offset;
2318 decode_addr_const (tree exp, struct addr_const *value)
2320 tree target = TREE_OPERAND (exp, 0);
2326 if (TREE_CODE (target) == COMPONENT_REF
2327 && host_integerp (byte_position (TREE_OPERAND (target, 1)), 0))
2330 offset += int_byte_position (TREE_OPERAND (target, 1));
2331 target = TREE_OPERAND (target, 0);
2333 else if (TREE_CODE (target) == ARRAY_REF
2334 || TREE_CODE (target) == ARRAY_RANGE_REF)
2336 offset += (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target)), 1)
2337 * tree_low_cst (TREE_OPERAND (target, 1), 0));
2338 target = TREE_OPERAND (target, 0);
2344 switch (TREE_CODE (target))
2348 x = DECL_RTL (target);
2352 x = gen_rtx_MEM (FUNCTION_MODE,
2353 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2361 x = output_constant_def (target, 1);
2368 gcc_assert (MEM_P (x));
2372 value->offset = offset;
2375 /* Uniquize all constants that appear in memory.
2376 Each constant in memory thus far output is recorded
2377 in `const_desc_table'. */
2379 struct constant_descriptor_tree GTY(())
2381 /* A MEM for the constant. */
2384 /* The value of the constant. */
2387 /* Hash of value. Computing the hash from value each time
2388 hashfn is called can't work properly, as that means recursive
2389 use of the hash table during hash table expansion. */
2393 static GTY((param_is (struct constant_descriptor_tree)))
2394 htab_t const_desc_htab;
2396 static struct constant_descriptor_tree * build_constant_desc (tree);
2397 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2399 /* Compute a hash code for a constant expression. */
2402 const_desc_hash (const void *ptr)
2404 return ((struct constant_descriptor_tree *)ptr)->hash;
2408 const_hash_1 (const tree exp)
2413 enum tree_code code = TREE_CODE (exp);
2415 /* Either set P and LEN to the address and len of something to hash and
2416 exit the switch or return a value. */
2421 p = (char *) &TREE_INT_CST (exp);
2422 len = sizeof TREE_INT_CST (exp);
2426 return real_hash (TREE_REAL_CST_PTR (exp));
2429 p = TREE_STRING_POINTER (exp);
2430 len = TREE_STRING_LENGTH (exp);
2434 return (const_hash_1 (TREE_REALPART (exp)) * 5
2435 + const_hash_1 (TREE_IMAGPART (exp)));
2439 unsigned HOST_WIDE_INT idx;
2442 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2444 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
2446 hi = hi * 603 + const_hash_1 (value);
2454 struct addr_const value;
2456 decode_addr_const (exp, &value);
2457 switch (GET_CODE (value.base))
2460 /* Don't hash the address of the SYMBOL_REF;
2461 only use the offset and the symbol name. */
2463 p = XSTR (value.base, 0);
2464 for (i = 0; p[i] != 0; i++)
2465 hi = ((hi * 613) + (unsigned) (p[i]));
2469 hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
2480 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2481 + const_hash_1 (TREE_OPERAND (exp, 1)));
2485 case NON_LVALUE_EXPR:
2486 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2489 /* A language specific constant. Just hash the code. */
2493 /* Compute hashing function. */
2495 for (i = 0; i < len; i++)
2496 hi = ((hi * 613) + (unsigned) (p[i]));
2501 /* Wrapper of compare_constant, for the htab interface. */
2503 const_desc_eq (const void *p1, const void *p2)
2505 const struct constant_descriptor_tree *c1 = p1;
2506 const struct constant_descriptor_tree *c2 = p2;
2507 if (c1->hash != c2->hash)
2509 return compare_constant (c1->value, c2->value);
2512 /* Compare t1 and t2, and return 1 only if they are known to result in
2513 the same bit pattern on output. */
2516 compare_constant (const tree t1, const tree t2)
2518 enum tree_code typecode;
2520 if (t1 == NULL_TREE)
2521 return t2 == NULL_TREE;
2522 if (t2 == NULL_TREE)
2525 if (TREE_CODE (t1) != TREE_CODE (t2))
2528 switch (TREE_CODE (t1))
2531 /* Integer constants are the same only if the same width of type. */
2532 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2534 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2536 return tree_int_cst_equal (t1, t2);
2539 /* Real constants are the same only if the same width of type. */
2540 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2543 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
2546 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2549 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
2550 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
2551 TREE_STRING_LENGTH (t1)));
2554 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
2555 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
2559 VEC(constructor_elt, gc) *v1, *v2;
2560 unsigned HOST_WIDE_INT idx;
2562 typecode = TREE_CODE (TREE_TYPE (t1));
2563 if (typecode != TREE_CODE (TREE_TYPE (t2)))
2566 if (typecode == ARRAY_TYPE)
2568 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
2569 /* For arrays, check that the sizes all match. */
2570 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
2572 || size_1 != int_size_in_bytes (TREE_TYPE (t2)))
2577 /* For record and union constructors, require exact type
2579 if (TREE_TYPE (t1) != TREE_TYPE (t2))
2583 v1 = CONSTRUCTOR_ELTS (t1);
2584 v2 = CONSTRUCTOR_ELTS (t2);
2585 if (VEC_length (constructor_elt, v1)
2586 != VEC_length (constructor_elt, v2))
2589 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
2591 constructor_elt *c1 = VEC_index (constructor_elt, v1, idx);
2592 constructor_elt *c2 = VEC_index (constructor_elt, v2, idx);
2594 /* Check that each value is the same... */
2595 if (!compare_constant (c1->value, c2->value))
2597 /* ... and that they apply to the same fields! */
2598 if (typecode == ARRAY_TYPE)
2600 if (!compare_constant (c1->index, c2->index))
2605 if (c1->index != c2->index)
2616 struct addr_const value1, value2;
2618 decode_addr_const (t1, &value1);
2619 decode_addr_const (t2, &value2);
2620 return (value1.offset == value2.offset
2621 && strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
2627 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
2628 && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
2632 case NON_LVALUE_EXPR:
2633 case VIEW_CONVERT_EXPR:
2634 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
2639 nt1 = lang_hooks.expand_constant (t1);
2640 nt2 = lang_hooks.expand_constant (t2);
2641 if (nt1 != t1 || nt2 != t2)
2642 return compare_constant (nt1, nt2);
2651 /* Make a copy of the whole tree structure for a constant. This
2652 handles the same types of nodes that compare_constant handles. */
2655 copy_constant (tree exp)
2657 switch (TREE_CODE (exp))
2660 /* For ADDR_EXPR, we do not want to copy the decl whose address
2661 is requested. We do want to copy constants though. */
2662 if (CONSTANT_CLASS_P (TREE_OPERAND (exp, 0)))
2663 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2664 copy_constant (TREE_OPERAND (exp, 0)));
2666 return copy_node (exp);
2671 return copy_node (exp);
2674 return build_complex (TREE_TYPE (exp),
2675 copy_constant (TREE_REALPART (exp)),
2676 copy_constant (TREE_IMAGPART (exp)));
2680 return build2 (TREE_CODE (exp), TREE_TYPE (exp),
2681 copy_constant (TREE_OPERAND (exp, 0)),
2682 copy_constant (TREE_OPERAND (exp, 1)));
2686 case NON_LVALUE_EXPR:
2687 case VIEW_CONVERT_EXPR:
2688 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2689 copy_constant (TREE_OPERAND (exp, 0)));
2693 tree copy = copy_node (exp);
2694 VEC(constructor_elt, gc) *v;
2695 unsigned HOST_WIDE_INT idx;
2696 tree purpose, value;
2698 v = VEC_alloc(constructor_elt, gc, VEC_length(constructor_elt,
2699 CONSTRUCTOR_ELTS (exp)));
2700 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, purpose, value)
2702 constructor_elt *ce = VEC_quick_push (constructor_elt, v, NULL);
2703 ce->index = purpose;
2704 ce->value = copy_constant (value);
2706 CONSTRUCTOR_ELTS (copy) = v;
2712 tree t = lang_hooks.expand_constant (exp);
2714 gcc_assert (t == exp);
2715 return copy_constant (t);
2720 /* Return the alignment of constant EXP in bits. */
2723 get_constant_alignment (tree exp)
2727 align = TYPE_ALIGN (TREE_TYPE (exp));
2728 #ifdef CONSTANT_ALIGNMENT
2729 align = CONSTANT_ALIGNMENT (exp, align);
2734 /* Return the section into which constant EXP should be placed. */
2737 get_constant_section (tree exp)
2739 if (IN_NAMED_SECTION (exp))
2740 return get_named_section (exp, NULL, compute_reloc_for_constant (exp));
2742 return targetm.asm_out.select_section (exp,
2743 compute_reloc_for_constant (exp),
2744 get_constant_alignment (exp));
2747 /* Return the size of constant EXP in bytes. */
2749 static HOST_WIDE_INT
2750 get_constant_size (tree exp)
2754 size = int_size_in_bytes (TREE_TYPE (exp));
2755 if (TREE_CODE (exp) == STRING_CST)
2756 size = MAX (TREE_STRING_LENGTH (exp), size);
2760 /* Subroutine of output_constant_def:
2761 No constant equal to EXP is known to have been output.
2762 Make a constant descriptor to enter EXP in the hash table.
2763 Assign the label number and construct RTL to refer to the
2764 constant's location in memory.
2765 Caller is responsible for updating the hash table. */
2767 static struct constant_descriptor_tree *
2768 build_constant_desc (tree exp)
2774 struct constant_descriptor_tree *desc;
2776 desc = ggc_alloc (sizeof (*desc));
2777 desc->value = copy_constant (exp);
2779 /* Propagate marked-ness to copied constant. */
2780 if (flag_mudflap && mf_marked_p (exp))
2781 mf_mark (desc->value);
2783 /* Create a string containing the label name, in LABEL. */
2784 labelno = const_labelno++;
2785 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
2787 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
2788 if (use_object_blocks_p ())
2790 section *sect = get_constant_section (exp);
2791 symbol = create_block_symbol (ggc_strdup (label),
2792 get_block_for_section (sect), -1);
2795 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
2796 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
2797 SET_SYMBOL_REF_DECL (symbol, desc->value);
2798 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
2800 rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), symbol);
2801 set_mem_attributes (rtl, exp, 1);
2802 set_mem_alias_set (rtl, 0);
2803 set_mem_alias_set (rtl, const_alias_set);
2805 /* Set flags or add text to the name to record information, such as
2806 that it is a local symbol. If the name is changed, the macro
2807 ASM_OUTPUT_LABELREF will have to know how to strip this
2808 information. This call might invalidate our local variable
2809 SYMBOL; we can't use it afterward. */
2811 targetm.encode_section_info (exp, rtl, true);
2818 /* Return an rtx representing a reference to constant data in memory
2819 for the constant expression EXP.
2821 If assembler code for such a constant has already been output,
2822 return an rtx to refer to it.
2823 Otherwise, output such a constant in memory
2824 and generate an rtx for it.
2826 If DEFER is nonzero, this constant can be deferred and output only
2827 if referenced in the function after all optimizations.
2829 `const_desc_table' records which constants already have label strings. */
2832 output_constant_def (tree exp, int defer)
2834 struct constant_descriptor_tree *desc;
2835 struct constant_descriptor_tree key;
2838 /* Look up EXP in the table of constant descriptors. If we didn't find
2839 it, create a new one. */
2841 key.hash = const_hash_1 (exp);
2842 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
2847 desc = build_constant_desc (exp);
2848 desc->hash = key.hash;
2852 maybe_output_constant_def_contents (desc, defer);
2856 /* Subroutine of output_constant_def: Decide whether or not we need to
2857 output the constant DESC now, and if so, do it. */
2859 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
2862 rtx symbol = XEXP (desc->rtl, 0);
2863 tree exp = desc->value;
2865 if (flag_syntax_only)
2868 if (TREE_ASM_WRITTEN (exp))
2869 /* Already output; don't do it again. */
2872 /* We can always defer constants as long as the context allows
2876 /* Increment n_deferred_constants if it exists. It needs to be at
2877 least as large as the number of constants actually referred to
2878 by the function. If it's too small we'll stop looking too early
2879 and fail to emit constants; if it's too large we'll only look
2880 through the entire function when we could have stopped earlier. */
2882 n_deferred_constants++;
2886 output_constant_def_contents (symbol);
2889 /* Subroutine of output_constant_def_contents. Output the definition
2890 of constant EXP, which is pointed to by label LABEL. ALIGN is the
2891 constant's alignment in bits. */
2894 assemble_constant_contents (tree exp, const char *label, unsigned int align)
2898 size = get_constant_size (exp);
2900 /* Do any machine/system dependent processing of the constant. */
2901 #ifdef ASM_DECLARE_CONSTANT_NAME
2902 ASM_DECLARE_CONSTANT_NAME (asm_out_file, label, exp, size);
2904 /* Standard thing is just output label for the constant. */
2905 ASM_OUTPUT_LABEL (asm_out_file, label);
2906 #endif /* ASM_DECLARE_CONSTANT_NAME */
2908 /* Output the value of EXP. */
2909 output_constant (exp, size, align);
2912 /* We must output the constant data referred to by SYMBOL; do so. */
2915 output_constant_def_contents (rtx symbol)
2917 tree exp = SYMBOL_REF_DECL (symbol);
2920 /* Make sure any other constants whose addresses appear in EXP
2921 are assigned label numbers. */
2922 output_addressed_constants (exp);
2924 /* We are no longer deferring this constant. */
2925 TREE_ASM_WRITTEN (exp) = 1;
2927 /* If the constant is part of an object block, make sure that the
2928 decl has been positioned within its block, but do not write out
2929 its definition yet. output_object_blocks will do that later. */
2930 if (SYMBOL_REF_IN_BLOCK_P (symbol))
2931 place_block_symbol (symbol);
2934 switch_to_section (get_constant_section (exp));
2935 align = get_constant_alignment (exp);
2936 if (align > BITS_PER_UNIT)
2937 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
2938 assemble_constant_contents (exp, XSTR (symbol, 0), align);
2941 mudflap_enqueue_constant (exp);
2944 /* Look up EXP in the table of constant descriptors. Return the rtl
2945 if it has been emitted, else null. */
2948 lookup_constant_def (tree exp)
2950 struct constant_descriptor_tree *desc;
2951 struct constant_descriptor_tree key;
2954 key.hash = const_hash_1 (exp);
2955 desc = htab_find_with_hash (const_desc_htab, &key, key.hash);
2957 return (desc ? desc->rtl : NULL_RTX);
2960 /* Used in the hash tables to avoid outputting the same constant
2961 twice. Unlike 'struct constant_descriptor_tree', RTX constants
2962 are output once per function, not once per file. */
2963 /* ??? Only a few targets need per-function constant pools. Most
2964 can use one per-file pool. Should add a targetm bit to tell the
2967 struct rtx_constant_pool GTY(())
2969 /* Pointers to first and last constant in pool, as ordered by offset. */
2970 struct constant_descriptor_rtx *first;
2971 struct constant_descriptor_rtx *last;
2973 /* Hash facility for making memory-constants from constant rtl-expressions.
2974 It is used on RISC machines where immediate integer arguments and
2975 constant addresses are restricted so that such constants must be stored
2977 htab_t GTY((param_is (struct constant_descriptor_rtx))) const_rtx_htab;
2979 /* Current offset in constant pool (does not include any
2980 machine-specific header). */
2981 HOST_WIDE_INT offset;
2984 struct constant_descriptor_rtx GTY((chain_next ("%h.next")))
2986 struct constant_descriptor_rtx *next;
2990 HOST_WIDE_INT offset;
2992 enum machine_mode mode;
2998 /* Hash and compare functions for const_rtx_htab. */
3001 const_desc_rtx_hash (const void *ptr)
3003 const struct constant_descriptor_rtx *desc = ptr;
3008 const_desc_rtx_eq (const void *a, const void *b)
3010 const struct constant_descriptor_rtx *x = a;
3011 const struct constant_descriptor_rtx *y = b;
3013 if (x->mode != y->mode)
3015 return rtx_equal_p (x->constant, y->constant);
3018 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3021 const_rtx_hash_1 (rtx *xp, void *data)
3023 unsigned HOST_WIDE_INT hwi;
3024 enum machine_mode mode;
3030 code = GET_CODE (x);
3031 mode = GET_MODE (x);
3032 h = (hashval_t) code * 1048573 + mode;
3040 const int shift = sizeof (hashval_t) * CHAR_BIT;
3041 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3044 h ^= (hashval_t) hwi;
3045 for (i = 1; i < n; ++i)
3048 h ^= (hashval_t) hwi;
3054 if (mode == VOIDmode)
3056 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3060 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3066 for (i = XVECLEN (x, 0); i-- > 0; )
3067 h = h * 251 + const_rtx_hash_1 (&XVECEXP (x, 0, i), data);
3072 h ^= htab_hash_string (XSTR (x, 0));
3076 h = h * 251 + CODE_LABEL_NUMBER (XEXP (x, 0));
3080 case UNSPEC_VOLATILE:
3081 h = h * 251 + XINT (x, 1);
3089 *hp = *hp * 509 + h;
3093 /* Compute a hash value for X, which should be a constant. */
3096 const_rtx_hash (rtx x)
3099 for_each_rtx (&x, const_rtx_hash_1, &h);
3104 /* Initialize constant pool hashing for a new function. */
3107 init_varasm_status (struct function *f)
3109 struct varasm_status *p;
3110 struct rtx_constant_pool *pool;
3112 p = ggc_alloc (sizeof (struct varasm_status));
3115 pool = ggc_alloc (sizeof (struct rtx_constant_pool));
3117 p->deferred_constants = 0;
3119 pool->const_rtx_htab = htab_create_ggc (31, const_desc_rtx_hash,
3120 const_desc_rtx_eq, NULL);
3121 pool->first = pool->last = NULL;
3125 /* Given a MINUS expression, simplify it if both sides
3126 include the same symbol. */
3129 simplify_subtraction (rtx x)
3131 rtx r = simplify_rtx (x);
3135 /* Given a constant rtx X, make (or find) a memory constant for its value
3136 and return a MEM rtx to refer to it in memory. */
3139 force_const_mem (enum machine_mode mode, rtx x)
3141 struct constant_descriptor_rtx *desc, tmp;
3142 struct rtx_constant_pool *pool = cfun->varasm->pool;
3149 /* If we're not allowed to drop X into the constant pool, don't. */
3150 if (targetm.cannot_force_const_mem (x))
3153 /* Lookup the value in the hashtable. */
3156 hash = const_rtx_hash (x);
3157 slot = htab_find_slot_with_hash (pool->const_rtx_htab, &tmp, hash, INSERT);
3160 /* If the constant was already present, return its memory. */
3162 return copy_rtx (desc->mem);
3164 /* Otherwise, create a new descriptor. */
3165 desc = ggc_alloc (sizeof (*desc));
3168 /* Align the location counter as required by EXP's data type. */
3169 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3170 #ifdef CONSTANT_ALIGNMENT
3172 tree type = lang_hooks.types.type_for_mode (mode, 0);
3173 if (type != NULL_TREE)
3174 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3178 pool->offset += (align / BITS_PER_UNIT) - 1;
3179 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3182 desc->constant = tmp.constant;
3183 desc->offset = pool->offset;
3186 desc->align = align;
3187 desc->labelno = const_labelno;
3190 pool->offset += GET_MODE_SIZE (mode);
3192 pool->last->next = desc;
3194 pool->first = pool->last = desc;
3197 /* Create a string containing the label name, in LABEL. */
3198 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3201 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3202 the constants pool. */
3203 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3205 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3206 symbol = create_block_symbol (ggc_strdup (label),
3207 get_block_for_section (sect), -1);
3210 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3212 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3213 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3214 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3215 current_function_uses_const_pool = 1;
3217 /* Construct the MEM. */
3218 desc->mem = def = gen_const_mem (mode, symbol);
3219 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3220 set_mem_align (def, align);
3222 /* If we're dropping a label to the constant pool, make sure we
3224 if (GET_CODE (x) == LABEL_REF)
3225 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3227 return copy_rtx (def);
3230 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3233 get_pool_constant (rtx addr)
3235 return SYMBOL_REF_CONSTANT (addr)->constant;
3238 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3239 and whether it has been output or not. */
3242 get_pool_constant_mark (rtx addr, bool *pmarked)
3244 struct constant_descriptor_rtx *desc;
3246 desc = SYMBOL_REF_CONSTANT (addr);
3247 *pmarked = (desc->mark != 0);
3248 return desc->constant;
3251 /* Similar, return the mode. */
3254 get_pool_mode (rtx addr)
3256 return SYMBOL_REF_CONSTANT (addr)->mode;
3259 /* Return the size of the constant pool. */
3262 get_pool_size (void)
3264 return cfun->varasm->pool->offset;
3267 /* Worker function for output_constant_pool_1. Emit assembly for X
3268 in MODE with known alignment ALIGN. */
3271 output_constant_pool_2 (enum machine_mode mode, rtx x, unsigned int align)
3273 switch (GET_MODE_CLASS (mode))
3276 case MODE_DECIMAL_FLOAT:
3280 gcc_assert (GET_CODE (x) == CONST_DOUBLE);
3281 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
3282 assemble_real (r, mode, align);
3287 case MODE_PARTIAL_INT:
3288 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3291 case MODE_VECTOR_FLOAT:
3292 case MODE_VECTOR_INT:
3295 enum machine_mode submode = GET_MODE_INNER (mode);
3296 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3298 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3299 units = CONST_VECTOR_NUNITS (x);
3301 for (i = 0; i < units; i++)
3303 rtx elt = CONST_VECTOR_ELT (x, i);
3304 output_constant_pool_2 (submode, elt, i ? subalign : align);
3314 /* Worker function for output_constant_pool. Emit constant DESC,
3315 giving it ALIGN bits of alignment. */
3318 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3325 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3326 whose CODE_LABEL has been deleted. This can occur if a jump table
3327 is eliminated by optimization. If so, write a constant of zero
3328 instead. Note that this can also happen by turning the
3329 CODE_LABEL into a NOTE. */
3330 /* ??? This seems completely and utterly wrong. Certainly it's
3331 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3332 functioning even with INSN_DELETED_P and friends. */
3335 switch (GET_CODE (x))
3338 if (GET_CODE (XEXP (x, 0)) != PLUS
3339 || GET_CODE (XEXP (XEXP (x, 0), 0)) != LABEL_REF)
3341 tmp = XEXP (XEXP (x, 0), 0);
3346 gcc_assert (!INSN_DELETED_P (tmp));
3347 gcc_assert (!NOTE_P (tmp)
3348 || NOTE_LINE_NUMBER (tmp) != NOTE_INSN_DELETED);
3355 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3356 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3357 align, desc->labelno, done);
3360 assemble_align (align);
3362 /* Output the label. */
3363 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3365 /* Output the data. */
3366 output_constant_pool_2 (desc->mode, x, align);
3368 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3369 sections have proper size. */
3370 if (align > GET_MODE_BITSIZE (desc->mode)
3372 && (in_section->common.flags & SECTION_MERGE))
3373 assemble_align (align);
3375 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3381 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3382 to as used. Emit referenced deferred strings. This function can
3383 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3386 mark_constant (rtx *current_rtx, void *data)
3388 struct rtx_constant_pool *pool = data;
3389 rtx x = *current_rtx;
3391 if (x == NULL_RTX || GET_CODE (x) != SYMBOL_REF)
3394 if (CONSTANT_POOL_ADDRESS_P (x))
3396 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3397 if (desc->mark == 0)
3400 for_each_rtx (&desc->constant, mark_constant, pool);
3403 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3405 tree exp = SYMBOL_REF_DECL (x);
3406 if (!TREE_ASM_WRITTEN (exp))
3408 n_deferred_constants--;
3409 output_constant_def_contents (x);
3416 /* Look through appropriate parts of INSN, marking all entries in the
3417 constant pool which are actually being used. Entries that are only
3418 referenced by other constants are also marked as used. Emit
3419 deferred strings that are used. */
3422 mark_constants (struct rtx_constant_pool *pool, rtx insn)
3427 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3428 insns, not any notes that may be attached. We don't want to mark
3429 a constant just because it happens to appear in a REG_EQUIV note. */
3430 if (GET_CODE (PATTERN (insn)) == SEQUENCE)
3432 rtx seq = PATTERN (insn);
3433 int i, n = XVECLEN (seq, 0);
3434 for (i = 0; i < n; ++i)
3436 rtx subinsn = XVECEXP (seq, 0, i);
3437 if (INSN_P (subinsn))
3438 for_each_rtx (&PATTERN (subinsn), mark_constant, pool);
3442 for_each_rtx (&PATTERN (insn), mark_constant, pool);
3445 /* Look through the instructions for this function, and mark all the
3446 entries in POOL which are actually being used. Emit deferred constants
3447 which have indeed been used. */
3450 mark_constant_pool (struct rtx_constant_pool *pool)
3454 if (pool->first == 0 && n_deferred_constants == 0)
3457 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3458 mark_constants (pool, insn);
3460 for (link = current_function_epilogue_delay_list;
3462 link = XEXP (link, 1))
3463 mark_constants (pool, XEXP (link, 0));
3466 /* Write all the constants in the constant pool. */
3469 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
3470 tree fndecl ATTRIBUTE_UNUSED)
3472 struct rtx_constant_pool *pool = cfun->varasm->pool;
3473 struct constant_descriptor_rtx *desc;
3475 /* It is possible for gcc to call force_const_mem and then to later
3476 discard the instructions which refer to the constant. In such a
3477 case we do not need to output the constant. */
3478 mark_constant_pool (pool);
3480 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3481 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
3484 for (desc = pool->first; desc ; desc = desc->next)
3487 /* If the constant is part of an object_block, make sure that
3488 the constant has been positioned within its block, but do not
3489 write out its definition yet. output_object_blocks will do
3491 if (SYMBOL_REF_IN_BLOCK_P (desc->sym))
3492 place_block_symbol (desc->sym);
3495 switch_to_section (targetm.asm_out.select_rtx_section
3496 (desc->mode, desc->constant, desc->align));
3497 output_constant_pool_1 (desc, desc->align);
3501 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3502 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
3506 /* Determine what kind of relocations EXP may need. */
3509 compute_reloc_for_constant (tree exp)
3511 int reloc = 0, reloc2;
3514 /* Give the front-end a chance to convert VALUE to something that
3515 looks more like a constant to the back-end. */
3516 exp = lang_hooks.expand_constant (exp);
3518 switch (TREE_CODE (exp))
3522 /* Go inside any operations that get_inner_reference can handle and see
3523 if what's inside is a constant: no need to do anything here for
3524 addresses of variables or functions. */
3525 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3526 tem = TREE_OPERAND (tem, 0))
3529 if (TREE_PUBLIC (tem))
3536 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3537 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3541 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3542 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3543 /* The difference of two local labels is computable at link time. */
3544 if (reloc == 1 && reloc2 == 1)
3552 case NON_LVALUE_EXPR:
3553 case VIEW_CONVERT_EXPR:
3554 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3559 unsigned HOST_WIDE_INT idx;
3560 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3562 reloc |= compute_reloc_for_constant (tem);
3572 /* Find all the constants whose addresses are referenced inside of EXP,
3573 and make sure assembler code with a label has been output for each one.
3574 Indicate whether an ADDR_EXPR has been encountered. */
3577 output_addressed_constants (tree exp)
3581 /* Give the front-end a chance to convert VALUE to something that
3582 looks more like a constant to the back-end. */
3583 exp = lang_hooks.expand_constant (exp);
3585 switch (TREE_CODE (exp))
3589 /* Go inside any operations that get_inner_reference can handle and see
3590 if what's inside is a constant: no need to do anything here for
3591 addresses of variables or functions. */
3592 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3593 tem = TREE_OPERAND (tem, 0))
3596 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3597 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
3598 tem = DECL_INITIAL (tem);
3600 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
3601 output_constant_def (tem, 0);
3606 output_addressed_constants (TREE_OPERAND (exp, 1));
3611 case NON_LVALUE_EXPR:
3612 case VIEW_CONVERT_EXPR:
3613 output_addressed_constants (TREE_OPERAND (exp, 0));
3618 unsigned HOST_WIDE_INT idx;
3619 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3621 output_addressed_constants (tem);
3630 /* Return nonzero if VALUE is a valid constant-valued expression
3631 for use in initializing a static variable; one that can be an
3632 element of a "constant" initializer.
3634 Return null_pointer_node if the value is absolute;
3635 if it is relocatable, return the variable that determines the relocation.
3636 We assume that VALUE has been folded as much as possible;
3637 therefore, we do not need to check for such things as
3638 arithmetic-combinations of integers. */
3641 initializer_constant_valid_p (tree value, tree endtype)
3643 /* Give the front-end a chance to convert VALUE to something that
3644 looks more like a constant to the back-end. */
3645 value = lang_hooks.expand_constant (value);
3647 switch (TREE_CODE (value))
3650 if ((TREE_CODE (TREE_TYPE (value)) == UNION_TYPE
3651 || TREE_CODE (TREE_TYPE (value)) == RECORD_TYPE)
3652 && TREE_CONSTANT (value)
3653 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (value)))
3655 unsigned HOST_WIDE_INT idx;
3657 bool absolute = true;
3659 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
3662 reloc = initializer_constant_valid_p (elt, TREE_TYPE (elt));
3665 if (reloc != null_pointer_node)
3668 /* For a non-absolute relocation, there is no single
3669 variable that can be "the variable that determines the
3671 return absolute ? null_pointer_node : error_mark_node;
3674 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
3681 return null_pointer_node;
3685 value = staticp (TREE_OPERAND (value, 0));
3688 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out to
3689 be a constant, this is old-skool offsetof-like nonsense. */
3690 if (TREE_CODE (value) == INDIRECT_REF
3691 && TREE_CONSTANT (TREE_OPERAND (value, 0)))
3692 return null_pointer_node;
3693 /* Taking the address of a nested function involves a trampoline. */
3694 if (TREE_CODE (value) == FUNCTION_DECL
3695 && ((decl_function_context (value)
3696 && !DECL_NO_STATIC_CHAIN (value))
3697 || DECL_DLLIMPORT_P (value)))
3699 /* "&{...}" requires a temporary to hold the constructed
3701 if (TREE_CODE (value) == CONSTRUCTOR)
3706 case VIEW_CONVERT_EXPR:
3707 case NON_LVALUE_EXPR:
3708 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
3717 src = TREE_OPERAND (value, 0);
3718 src_type = TREE_TYPE (src);
3719 dest_type = TREE_TYPE (value);
3721 /* Allow conversions between pointer types, floating-point
3722 types, and offset types. */
3723 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
3724 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
3725 || (TREE_CODE (dest_type) == OFFSET_TYPE
3726 && TREE_CODE (src_type) == OFFSET_TYPE))
3727 return initializer_constant_valid_p (src, endtype);
3729 /* Allow length-preserving conversions between integer types. */
3730 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
3731 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
3732 return initializer_constant_valid_p (src, endtype);
3734 /* Allow conversions between other integer types only if
3736 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
3738 tree inner = initializer_constant_valid_p (src, endtype);
3739 if (inner == null_pointer_node)
3740 return null_pointer_node;
3744 /* Allow (int) &foo provided int is as wide as a pointer. */
3745 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
3746 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
3747 return initializer_constant_valid_p (src, endtype);
3749 /* Likewise conversions from int to pointers, but also allow
3750 conversions from 0. */
3751 if ((POINTER_TYPE_P (dest_type)
3752 || TREE_CODE (dest_type) == OFFSET_TYPE)
3753 && INTEGRAL_TYPE_P (src_type))
3755 if (TREE_CODE (src) == INTEGER_CST
3756 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
3757 return null_pointer_node;
3758 if (integer_zerop (src))
3759 return null_pointer_node;
3760 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
3761 return initializer_constant_valid_p (src, endtype);
3764 /* Allow conversions to struct or union types if the value
3766 if (TREE_CODE (dest_type) == RECORD_TYPE
3767 || TREE_CODE (dest_type) == UNION_TYPE)
3768 return initializer_constant_valid_p (src, endtype);
3773 if (! INTEGRAL_TYPE_P (endtype)
3774 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
3776 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
3778 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
3780 /* If either term is absolute, use the other terms relocation. */
3781 if (valid0 == null_pointer_node)
3783 if (valid1 == null_pointer_node)
3789 if (! INTEGRAL_TYPE_P (endtype)
3790 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
3792 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
3794 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
3796 /* Win if second argument is absolute. */
3797 if (valid1 == null_pointer_node)
3799 /* Win if both arguments have the same relocation.
3800 Then the value is absolute. */
3801 if (valid0 == valid1 && valid0 != 0)
3802 return null_pointer_node;
3804 /* Since GCC guarantees that string constants are unique in the
3805 generated code, a subtraction between two copies of the same
3806 constant string is absolute. */
3807 if (valid0 && TREE_CODE (valid0) == STRING_CST
3808 && valid1 && TREE_CODE (valid1) == STRING_CST
3809 && operand_equal_p (valid0, valid1, 1))
3810 return null_pointer_node;
3813 /* Support narrowing differences. */
3814 if (INTEGRAL_TYPE_P (endtype))
3818 op0 = TREE_OPERAND (value, 0);
3819 op1 = TREE_OPERAND (value, 1);
3821 /* Like STRIP_NOPS except allow the operand mode to widen.
3822 This works around a feature of fold that simplifies
3823 (int)(p1 - p2) to ((int)p1 - (int)p2) under the theory
3824 that the narrower operation is cheaper. */
3826 while (TREE_CODE (op0) == NOP_EXPR
3827 || TREE_CODE (op0) == CONVERT_EXPR
3828 || TREE_CODE (op0) == NON_LVALUE_EXPR)
3830 tree inner = TREE_OPERAND (op0, 0);
3831 if (inner == error_mark_node
3832 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
3833 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
3834 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
3839 while (TREE_CODE (op1) == NOP_EXPR
3840 || TREE_CODE (op1) == CONVERT_EXPR
3841 || TREE_CODE (op1) == NON_LVALUE_EXPR)
3843 tree inner = TREE_OPERAND (op1, 0);
3844 if (inner == error_mark_node
3845 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
3846 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
3847 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
3852 op0 = initializer_constant_valid_p (op0, endtype);
3853 op1 = initializer_constant_valid_p (op1, endtype);
3855 /* Both initializers must be known. */
3859 return null_pointer_node;
3861 /* Support differences between labels. */
3862 if (TREE_CODE (op0) == LABEL_DECL
3863 && TREE_CODE (op1) == LABEL_DECL)
3864 return null_pointer_node;
3866 if (TREE_CODE (op0) == STRING_CST
3867 && TREE_CODE (op1) == STRING_CST
3868 && operand_equal_p (op0, op1, 1))
3869 return null_pointer_node;
3881 /* Output assembler code for constant EXP to FILE, with no label.
3882 This includes the pseudo-op such as ".int" or ".byte", and a newline.
3883 Assumes output_addressed_constants has been done on EXP already.
3885 Generate exactly SIZE bytes of assembler data, padding at the end
3886 with zeros if necessary. SIZE must always be specified.
3888 SIZE is important for structure constructors,
3889 since trailing members may have been omitted from the constructor.
3890 It is also important for initialization of arrays from string constants
3891 since the full length of the string constant might not be wanted.
3892 It is also needed for initialization of unions, where the initializer's
3893 type is just one member, and that may not be as long as the union.
3895 There a case in which we would fail to output exactly SIZE bytes:
3896 for a structure constructor that wants to produce more than SIZE bytes.
3897 But such constructors will never be generated for any possible input.
3899 ALIGN is the alignment of the data in bits. */
3902 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
3904 enum tree_code code;
3905 unsigned HOST_WIDE_INT thissize;
3907 /* Some front-ends use constants other than the standard language-independent
3908 varieties, but which may still be output directly. Give the front-end a
3909 chance to convert EXP to a language-independent representation. */
3910 exp = lang_hooks.expand_constant (exp);
3912 if (size == 0 || flag_syntax_only)
3915 /* See if we're trying to initialize a pointer in a non-default mode
3916 to the address of some declaration somewhere. If the target says
3917 the mode is valid for pointers, assume the target has a way of
3919 if (TREE_CODE (exp) == NOP_EXPR
3920 && POINTER_TYPE_P (TREE_TYPE (exp))
3921 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
3923 tree saved_type = TREE_TYPE (exp);
3925 /* Peel off any intermediate conversions-to-pointer for valid
3927 while (TREE_CODE (exp) == NOP_EXPR
3928 && POINTER_TYPE_P (TREE_TYPE (exp))
3929 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
3930 exp = TREE_OPERAND (exp, 0);
3932 /* If what we're left with is the address of something, we can
3933 convert the address to the final type and output it that
3935 if (TREE_CODE (exp) == ADDR_EXPR)
3936 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
3937 /* Likewise for constant ints. */
3938 else if (TREE_CODE (exp) == INTEGER_CST)
3939 exp = build_int_cst_wide (saved_type, TREE_INT_CST_LOW (exp),
3940 TREE_INT_CST_HIGH (exp));
3944 /* Eliminate any conversions since we'll be outputting the underlying
3946 while (TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
3947 || TREE_CODE (exp) == NON_LVALUE_EXPR
3948 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
3950 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
3951 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
3953 /* Make sure eliminating the conversion is really a no-op, except with
3954 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
3955 union types to allow for Ada unchecked unions. */
3956 if (type_size > op_size
3957 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
3958 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
3959 internal_error ("no-op convert from %wd to %wd bytes in initializer",
3960 op_size, type_size);
3962 exp = TREE_OPERAND (exp, 0);
3965 code = TREE_CODE (TREE_TYPE (exp));
3966 thissize = int_size_in_bytes (TREE_TYPE (exp));
3968 /* Allow a constructor with no elements for any data type.
3969 This means to fill the space with zeros. */
3970 if (TREE_CODE (exp) == CONSTRUCTOR
3971 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (exp)))
3973 assemble_zeros (size);
3977 if (TREE_CODE (exp) == FDESC_EXPR)
3979 #ifdef ASM_OUTPUT_FDESC
3980 HOST_WIDE_INT part = tree_low_cst (TREE_OPERAND (exp, 1), 0);
3981 tree decl = TREE_OPERAND (exp, 0);
3982 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
3989 /* Now output the underlying data. If we've handling the padding, return.
3990 Otherwise, break and ensure SIZE is the size written. */
3997 case REFERENCE_TYPE:
3999 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
4000 EXPAND_INITIALIZER),
4001 MIN (size, thissize), align, 0))
4002 error ("initializer for integer value is too complicated");
4006 if (TREE_CODE (exp) != REAL_CST)
4007 error ("initializer for floating value is not a floating constant");
4009 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)), align);
4013 output_constant (TREE_REALPART (exp), thissize / 2, align);
4014 output_constant (TREE_IMAGPART (exp), thissize / 2,
4015 min_align (align, BITS_PER_UNIT * (thissize / 2)));
4020 switch (TREE_CODE (exp))
4023 output_constructor (exp, size, align);
4026 thissize = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp),
4028 assemble_string (TREE_STRING_POINTER (exp), thissize);
4035 unsigned int nalign;
4036 enum machine_mode inner;
4038 inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4039 nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4041 elt_size = GET_MODE_SIZE (inner);
4043 link = TREE_VECTOR_CST_ELTS (exp);
4044 output_constant (TREE_VALUE (link), elt_size, align);
4045 while ((link = TREE_CHAIN (link)) != NULL)
4046 output_constant (TREE_VALUE (link), elt_size, nalign);
4056 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4057 output_constructor (exp, size, align);
4067 if (size > thissize)
4068 assemble_zeros (size - thissize);
4072 /* Subroutine of output_constructor, used for computing the size of
4073 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4074 type with an unspecified upper bound. */
4076 static unsigned HOST_WIDE_INT
4077 array_size_for_constructor (tree val)
4080 unsigned HOST_WIDE_INT cnt;
4083 /* This code used to attempt to handle string constants that are not
4084 arrays of single-bytes, but nothing else does, so there's no point in
4086 if (TREE_CODE (val) == STRING_CST)
4087 return TREE_STRING_LENGTH (val);
4089 max_index = NULL_TREE;
4090 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4092 if (TREE_CODE (index) == RANGE_EXPR)
4093 index = TREE_OPERAND (index, 1);
4094 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4098 if (max_index == NULL_TREE)
4101 /* Compute the total number of array elements. */
4102 i = size_binop (MINUS_EXPR, convert (sizetype, max_index),
4104 TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)))));
4105 i = size_binop (PLUS_EXPR, i, build_int_cst (sizetype, 1));
4107 /* Multiply by the array element unit size to find number of bytes. */
4108 i = size_binop (MULT_EXPR, i, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4110 return tree_low_cst (i, 1);
4113 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4114 Generate at least SIZE bytes, padding if necessary. */
4117 output_constructor (tree exp, unsigned HOST_WIDE_INT size,
4120 tree type = TREE_TYPE (exp);
4123 /* Number of bytes output or skipped so far.
4124 In other words, current position within the constructor. */
4125 HOST_WIDE_INT total_bytes = 0;
4126 /* Nonzero means BYTE contains part of a byte, to be output. */
4127 int byte_buffer_in_use = 0;
4129 unsigned HOST_WIDE_INT cnt;
4130 constructor_elt *ce;
4132 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
4134 if (TREE_CODE (type) == RECORD_TYPE)
4135 field = TYPE_FIELDS (type);
4137 if (TREE_CODE (type) == ARRAY_TYPE
4138 && TYPE_DOMAIN (type) != 0)
4139 min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (type));
4141 /* As LINK goes through the elements of the constant,
4142 FIELD goes through the structure fields, if the constant is a structure.
4143 if the constant is a union, then we override this,
4144 by getting the field from the TREE_LIST element.
4145 But the constant could also be an array. Then FIELD is zero.
4147 There is always a maximum of one element in the chain LINK for unions
4148 (even if the initializer in a source program incorrectly contains
4151 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), cnt, ce);
4152 cnt++, field = field ? TREE_CHAIN (field) : 0)
4154 tree val = ce->value;
4157 /* The element in a union constructor specifies the proper field
4159 if ((TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
4160 || TREE_CODE (type) == QUAL_UNION_TYPE)
4164 else if (TREE_CODE (type) == ARRAY_TYPE)
4167 #ifdef ASM_COMMENT_START
4168 if (field && flag_verbose_asm)
4169 fprintf (asm_out_file, "%s %s:\n",
4172 ? IDENTIFIER_POINTER (DECL_NAME (field))
4176 /* Eliminate the marker that makes a cast not be an lvalue. */
4180 if (index && TREE_CODE (index) == RANGE_EXPR)
4182 unsigned HOST_WIDE_INT fieldsize
4183 = int_size_in_bytes (TREE_TYPE (type));
4184 HOST_WIDE_INT lo_index = tree_low_cst (TREE_OPERAND (index, 0), 0);
4185 HOST_WIDE_INT hi_index = tree_low_cst (TREE_OPERAND (index, 1), 0);
4186 HOST_WIDE_INT index;
4187 unsigned int align2 = min_align (align, fieldsize * BITS_PER_UNIT);
4189 for (index = lo_index; index <= hi_index; index++)
4191 /* Output the element's initial value. */
4193 assemble_zeros (fieldsize);
4195 output_constant (val, fieldsize, align2);
4197 /* Count its size. */
4198 total_bytes += fieldsize;
4201 else if (field == 0 || !DECL_BIT_FIELD (field))
4203 /* An element that is not a bit-field. */
4205 unsigned HOST_WIDE_INT fieldsize;
4206 /* Since this structure is static,
4207 we know the positions are constant. */
4208 HOST_WIDE_INT pos = field ? int_byte_position (field) : 0;
4209 unsigned int align2;
4212 pos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val)), 1)
4213 * (tree_low_cst (index, 0) - tree_low_cst (min_index, 0)));
4215 /* Output any buffered-up bit-fields preceding this element. */
4216 if (byte_buffer_in_use)
4218 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4220 byte_buffer_in_use = 0;
4223 /* Advance to offset of this element.
4224 Note no alignment needed in an array, since that is guaranteed
4225 if each element has the proper size. */
4226 if ((field != 0 || index != 0) && pos != total_bytes)
4228 gcc_assert (pos >= total_bytes);
4229 assemble_zeros (pos - total_bytes);
4233 /* Find the alignment of this element. */
4234 align2 = min_align (align, BITS_PER_UNIT * pos);
4236 /* Determine size this element should occupy. */
4241 /* If this is an array with an unspecified upper bound,
4242 the initializer determines the size. */
4243 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4244 but we cannot do this until the deprecated support for
4245 initializing zero-length array members is removed. */
4246 if (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE
4247 && TYPE_DOMAIN (TREE_TYPE (field))
4248 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field))))
4250 fieldsize = array_size_for_constructor (val);
4251 /* Given a non-empty initialization, this field had
4253 gcc_assert (!fieldsize || !TREE_CHAIN (field));
4255 else if (DECL_SIZE_UNIT (field))
4257 /* ??? This can't be right. If the decl size overflows
4258 a host integer we will silently emit no data. */
4259 if (host_integerp (DECL_SIZE_UNIT (field), 1))
4260 fieldsize = tree_low_cst (DECL_SIZE_UNIT (field), 1);
4264 fieldsize = int_size_in_bytes (TREE_TYPE (type));
4266 /* Output the element's initial value. */
4268 assemble_zeros (fieldsize);
4270 output_constant (val, fieldsize, align2);
4272 /* Count its size. */
4273 total_bytes += fieldsize;
4275 else if (val != 0 && TREE_CODE (val) != INTEGER_CST)
4276 error ("invalid initial value for member %qs",
4277 IDENTIFIER_POINTER (DECL_NAME (field)));
4280 /* Element that is a bit-field. */
4282 HOST_WIDE_INT next_offset = int_bit_position (field);
4283 HOST_WIDE_INT end_offset
4284 = (next_offset + tree_low_cst (DECL_SIZE (field), 1));
4287 val = integer_zero_node;
4289 /* If this field does not start in this (or, next) byte,
4291 if (next_offset / BITS_PER_UNIT != total_bytes)
4293 /* Output remnant of any bit field in previous bytes. */
4294 if (byte_buffer_in_use)
4296 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4298 byte_buffer_in_use = 0;
4301 /* If still not at proper byte, advance to there. */
4302 if (next_offset / BITS_PER_UNIT != total_bytes)
4304 gcc_assert (next_offset / BITS_PER_UNIT >= total_bytes);
4305 assemble_zeros (next_offset / BITS_PER_UNIT - total_bytes);
4306 total_bytes = next_offset / BITS_PER_UNIT;
4310 if (! byte_buffer_in_use)
4313 /* We must split the element into pieces that fall within
4314 separate bytes, and combine each byte with previous or
4315 following bit-fields. */
4317 /* next_offset is the offset n fbits from the beginning of
4318 the structure to the next bit of this element to be processed.
4319 end_offset is the offset of the first bit past the end of
4321 while (next_offset < end_offset)
4325 HOST_WIDE_INT value;
4326 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
4327 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
4329 /* Advance from byte to byte
4330 within this element when necessary. */
4331 while (next_byte != total_bytes)
4333 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4338 /* Number of bits we can process at once
4339 (all part of the same byte). */
4340 this_time = MIN (end_offset - next_offset,
4341 BITS_PER_UNIT - next_bit);
4342 if (BYTES_BIG_ENDIAN)
4344 /* On big-endian machine, take the most significant bits
4345 first (of the bits that are significant)
4346 and put them into bytes from the most significant end. */
4347 shift = end_offset - next_offset - this_time;
4349 /* Don't try to take a bunch of bits that cross
4350 the word boundary in the INTEGER_CST. We can
4351 only select bits from the LOW or HIGH part
4353 if (shift < HOST_BITS_PER_WIDE_INT
4354 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4356 this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
4357 shift = HOST_BITS_PER_WIDE_INT;
4360 /* Now get the bits from the appropriate constant word. */
4361 if (shift < HOST_BITS_PER_WIDE_INT)
4362 value = TREE_INT_CST_LOW (val);
4365 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4366 value = TREE_INT_CST_HIGH (val);
4367 shift -= HOST_BITS_PER_WIDE_INT;
4370 /* Get the result. This works only when:
4371 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4372 byte |= (((value >> shift)
4373 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4374 << (BITS_PER_UNIT - this_time - next_bit));
4378 /* On little-endian machines,
4379 take first the least significant bits of the value
4380 and pack them starting at the least significant
4381 bits of the bytes. */
4382 shift = next_offset - int_bit_position (field);
4384 /* Don't try to take a bunch of bits that cross
4385 the word boundary in the INTEGER_CST. We can
4386 only select bits from the LOW or HIGH part
4388 if (shift < HOST_BITS_PER_WIDE_INT
4389 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4390 this_time = (HOST_BITS_PER_WIDE_INT - shift);
4392 /* Now get the bits from the appropriate constant word. */
4393 if (shift < HOST_BITS_PER_WIDE_INT)
4394 value = TREE_INT_CST_LOW (val);
4397 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4398 value = TREE_INT_CST_HIGH (val);
4399 shift -= HOST_BITS_PER_WIDE_INT;
4402 /* Get the result. This works only when:
4403 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4404 byte |= (((value >> shift)
4405 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4409 next_offset += this_time;
4410 byte_buffer_in_use = 1;
4415 if (byte_buffer_in_use)
4417 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4421 if ((unsigned HOST_WIDE_INT)total_bytes < size)
4422 assemble_zeros (size - total_bytes);
4425 /* This TREE_LIST contains any weak symbol declarations waiting
4427 static GTY(()) tree weak_decls;
4429 /* Mark DECL as weak. */
4432 mark_weak (tree decl)
4434 DECL_WEAK (decl) = 1;
4436 if (DECL_RTL_SET_P (decl)
4437 && MEM_P (DECL_RTL (decl))
4438 && XEXP (DECL_RTL (decl), 0)
4439 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
4440 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
4443 /* Merge weak status between NEWDECL and OLDDECL. */
4446 merge_weak (tree newdecl, tree olddecl)
4448 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
4450 if (DECL_WEAK (newdecl) && SUPPORTS_WEAK)
4453 /* We put the NEWDECL on the weak_decls list at some point
4454 and OLDDECL as well. Keep just OLDDECL on the list. */
4455 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
4456 if (TREE_VALUE (*pwd) == newdecl)
4458 *pwd = TREE_CHAIN (*pwd);
4465 if (DECL_WEAK (newdecl))
4469 /* NEWDECL is weak, but OLDDECL is not. */
4471 /* If we already output the OLDDECL, we're in trouble; we can't
4472 go back and make it weak. This error cannot caught in
4473 declare_weak because the NEWDECL and OLDDECL was not yet
4474 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4475 if (TREE_ASM_WRITTEN (olddecl))
4476 error ("weak declaration of %q+D must precede definition",
4479 /* If we've already generated rtl referencing OLDDECL, we may
4480 have done so in a way that will not function properly with
4482 else if (TREE_USED (olddecl)
4483 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)))
4484 warning (0, "weak declaration of %q+D after first use results "
4485 "in unspecified behavior", newdecl);
4489 /* We put the NEWDECL on the weak_decls list at some point.
4490 Replace it with the OLDDECL. */
4491 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
4492 if (TREE_VALUE (wd) == newdecl)
4494 TREE_VALUE (wd) = olddecl;
4497 /* We may not find the entry on the list. If NEWDECL is a
4498 weak alias, then we will have already called
4499 globalize_decl to remove the entry; in that case, we do
4500 not need to do anything. */
4503 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4504 mark_weak (olddecl);
4507 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4508 weak. Just update NEWDECL to indicate that it's weak too. */
4509 mark_weak (newdecl);
4512 /* Declare DECL to be a weak symbol. */
4515 declare_weak (tree decl)
4517 if (! TREE_PUBLIC (decl))
4518 error ("weak declaration of %q+D must be public", decl);
4519 else if (TREE_CODE (decl) == FUNCTION_DECL && TREE_ASM_WRITTEN (decl))
4520 error ("weak declaration of %q+D must precede definition", decl);
4521 else if (SUPPORTS_WEAK)
4523 if (! DECL_WEAK (decl))
4524 weak_decls = tree_cons (NULL, decl, weak_decls);
4527 warning (0, "weak declaration of %q+D not supported", decl);
4533 weak_finish_1 (tree decl)
4535 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
4536 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4539 if (! TREE_USED (decl))
4542 #ifdef ASM_WEAKEN_DECL
4543 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
4545 #ifdef ASM_WEAKEN_LABEL
4546 ASM_WEAKEN_LABEL (asm_out_file, name);
4548 #ifdef ASM_OUTPUT_WEAK_ALIAS
4550 static bool warn_once = 0;
4553 warning (0, "only weak aliases are supported in this configuration");
4563 /* This TREE_LIST contains weakref targets. */
4565 static GTY(()) tree weakref_targets;
4567 /* Forward declaration. */
4568 static tree find_decl_and_mark_needed (tree decl, tree target);
4570 /* Emit any pending weak declarations. */
4577 for (t = weakref_targets; t; t = TREE_CHAIN (t))
4579 tree alias_decl = TREE_PURPOSE (t);
4580 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
4582 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
4583 /* Remove alias_decl from the weak list, but leave entries for
4584 the target alone. */
4586 #ifndef ASM_OUTPUT_WEAKREF
4587 else if (! TREE_SYMBOL_REFERENCED (target))
4589 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
4590 defined, otherwise we and weak_finish_1 would use a
4591 different macros. */
4592 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
4593 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
4595 tree decl = find_decl_and_mark_needed (alias_decl, target);
4599 decl = build_decl (TREE_CODE (alias_decl), target,
4600 TREE_TYPE (alias_decl));
4602 DECL_EXTERNAL (decl) = 1;
4603 TREE_PUBLIC (decl) = 1;
4604 DECL_ARTIFICIAL (decl) = 1;
4605 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
4606 TREE_USED (decl) = 1;
4609 weak_finish_1 (decl);
4618 /* Remove the alias and the target from the pending weak list
4619 so that we do not emit any .weak directives for the former,
4620 nor multiple .weak directives for the latter. */
4621 for (p = &weak_decls; (t2 = *p) ; )
4623 if (TREE_VALUE (t2) == alias_decl
4624 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
4625 *p = TREE_CHAIN (t2);
4627 p = &TREE_CHAIN (t2);
4630 /* Remove other weakrefs to the same target, to speed things up. */
4631 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
4633 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
4634 *p = TREE_CHAIN (t2);
4636 p = &TREE_CHAIN (t2);
4641 for (t = weak_decls; t; t = TREE_CHAIN (t))
4643 tree decl = TREE_VALUE (t);
4645 weak_finish_1 (decl);
4649 /* Emit the assembly bits to indicate that DECL is globally visible. */
4652 globalize_decl (tree decl)
4654 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
4656 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
4657 if (DECL_WEAK (decl))
4661 #ifdef ASM_WEAKEN_DECL
4662 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
4664 ASM_WEAKEN_LABEL (asm_out_file, name);
4667 /* Remove this function from the pending weak list so that
4668 we do not emit multiple .weak directives for it. */
4669 for (p = &weak_decls; (t = *p) ; )
4671 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
4672 *p = TREE_CHAIN (t);
4674 p = &TREE_CHAIN (t);
4677 /* Remove weakrefs to the same target from the pending weakref
4678 list, for the same reason. */
4679 for (p = &weakref_targets; (t = *p) ; )
4681 if (DECL_ASSEMBLER_NAME (decl)
4682 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
4683 *p = TREE_CHAIN (t);
4685 p = &TREE_CHAIN (t);
4690 #elif defined(ASM_MAKE_LABEL_LINKONCE)
4691 if (DECL_ONE_ONLY (decl))
4692 ASM_MAKE_LABEL_LINKONCE (asm_out_file, name);
4695 targetm.asm_out.globalize_label (asm_out_file, name);
4698 /* We have to be able to tell cgraph about the needed-ness of the target
4699 of an alias. This requires that the decl have been defined. Aliases
4700 that precede their definition have to be queued for later processing. */
4702 typedef struct alias_pair GTY(())
4708 /* Define gc'd vector type. */
4709 DEF_VEC_O(alias_pair);
4710 DEF_VEC_ALLOC_O(alias_pair,gc);
4712 static GTY(()) VEC(alias_pair,gc) *alias_pairs;
4714 /* Given an assembly name, find the decl it is associated with. At the
4715 same time, mark it needed for cgraph. */
4718 find_decl_and_mark_needed (tree decl, tree target)
4720 struct cgraph_node *fnode = NULL;
4721 struct cgraph_varpool_node *vnode = NULL;
4723 if (TREE_CODE (decl) == FUNCTION_DECL)
4725 fnode = cgraph_node_for_asm (target);
4727 vnode = cgraph_varpool_node_for_asm (target);
4731 vnode = cgraph_varpool_node_for_asm (target);
4733 fnode = cgraph_node_for_asm (target);
4738 /* We can't mark function nodes as used after cgraph global info
4739 is finished. This wouldn't generally be necessary, but C++
4740 virtual table thunks are introduced late in the game and
4741 might seem like they need marking, although in fact they
4743 if (! cgraph_global_info_ready)
4744 cgraph_mark_needed_node (fnode);
4749 cgraph_varpool_mark_needed_node (vnode);
4756 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
4757 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
4758 tree node is DECL to have the value of the tree node TARGET. */
4761 do_assemble_alias (tree decl, tree target)
4763 if (TREE_ASM_WRITTEN (decl))
4766 TREE_ASM_WRITTEN (decl) = 1;
4767 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
4769 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
4771 ultimate_transparent_alias_target (&target);
4773 if (!TREE_SYMBOL_REFERENCED (target))
4774 weakref_targets = tree_cons (decl, target, weakref_targets);
4776 #ifdef ASM_OUTPUT_WEAKREF
4777 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
4778 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
4779 IDENTIFIER_POINTER (target));
4783 error ("%Jweakref is not supported in this configuration", decl);
4790 #ifdef ASM_OUTPUT_DEF
4791 /* Make name accessible from other files, if appropriate. */
4793 if (TREE_PUBLIC (decl))
4795 globalize_decl (decl);
4796 maybe_assemble_visibility (decl);
4799 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
4800 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
4802 ASM_OUTPUT_DEF (asm_out_file,
4803 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
4804 IDENTIFIER_POINTER (target));
4806 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
4811 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4812 # ifdef ASM_WEAKEN_DECL
4813 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
4815 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
4817 /* Remove this function from the pending weak list so that
4818 we do not emit multiple .weak directives for it. */
4819 for (p = &weak_decls; (t = *p) ; )
4820 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
4821 *p = TREE_CHAIN (t);
4823 p = &TREE_CHAIN (t);
4825 /* Remove weakrefs to the same target from the pending weakref
4826 list, for the same reason. */
4827 for (p = &weakref_targets; (t = *p) ; )
4829 if (DECL_ASSEMBLER_NAME (decl)
4830 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
4831 *p = TREE_CHAIN (t);
4833 p = &TREE_CHAIN (t);
4839 /* First pass of completing pending aliases. Make sure that cgraph knows
4840 which symbols will be required. */
4843 finish_aliases_1 (void)
4848 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
4852 target_decl = find_decl_and_mark_needed (p->decl, p->target);
4853 if (target_decl == NULL)
4855 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
4856 error ("%q+D aliased to undefined symbol %qs",
4857 p->decl, IDENTIFIER_POINTER (p->target));
4859 else if (DECL_EXTERNAL (target_decl)
4860 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
4861 error ("%q+D aliased to external symbol %qs",
4862 p->decl, IDENTIFIER_POINTER (p->target));
4866 /* Second pass of completing pending aliases. Emit the actual assembly.
4867 This happens at the end of compilation and thus it is assured that the
4868 target symbol has been emitted. */
4871 finish_aliases_2 (void)
4876 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
4877 do_assemble_alias (p->decl, p->target);
4879 VEC_truncate (alias_pair, alias_pairs, 0);
4882 /* Emit an assembler directive to make the symbol for DECL an alias to
4883 the symbol for TARGET. */
4886 assemble_alias (tree decl, tree target)
4889 bool is_weakref = false;
4891 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
4893 tree alias = DECL_ASSEMBLER_NAME (decl);
4897 ultimate_transparent_alias_target (&target);
4899 if (alias == target)
4900 error ("weakref %q+D ultimately targets itself", decl);
4903 #ifndef ASM_OUTPUT_WEAKREF
4904 IDENTIFIER_TRANSPARENT_ALIAS (alias) = 1;
4905 TREE_CHAIN (alias) = target;
4908 if (TREE_PUBLIC (decl))
4909 error ("weakref %q+D must have static linkage", decl);
4913 #if !defined (ASM_OUTPUT_DEF)
4914 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
4915 error ("%Jalias definitions not supported in this configuration", decl);
4918 if (!DECL_WEAK (decl))
4920 error ("%Jonly weak aliases are supported in this configuration", decl);
4927 /* We must force creation of DECL_RTL for debug info generation, even though
4928 we don't use it here. */
4929 make_decl_rtl (decl);
4930 TREE_USED (decl) = 1;
4932 /* A quirk of the initial implementation of aliases required that the user
4933 add "extern" to all of them. Which is silly, but now historical. Do
4934 note that the symbol is in fact locally defined. */
4936 DECL_EXTERNAL (decl) = 0;
4938 /* Allow aliases to aliases. */
4939 if (TREE_CODE (decl) == FUNCTION_DECL)
4940 cgraph_node (decl)->alias = true;
4942 cgraph_varpool_node (decl)->alias = true;
4944 /* If the target has already been emitted, we don't have to queue the
4945 alias. This saves a tad o memory. */
4946 target_decl = find_decl_and_mark_needed (decl, target);
4947 if (target_decl && TREE_ASM_WRITTEN (target_decl))
4948 do_assemble_alias (decl, target);
4951 alias_pair *p = VEC_safe_push (alias_pair, gc, alias_pairs, NULL);
4957 /* Emit an assembler directive to set symbol for DECL visibility to
4958 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
4961 default_assemble_visibility (tree decl, int vis)
4963 static const char * const visibility_types[] = {
4964 NULL, "internal", "hidden", "protected"
4967 const char *name, *type;
4969 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4970 type = visibility_types[vis];
4972 #ifdef HAVE_GAS_HIDDEN
4973 fprintf (asm_out_file, "\t.%s\t", type);
4974 assemble_name (asm_out_file, name);
4975 fprintf (asm_out_file, "\n");
4977 warning (OPT_Wattributes, "visibility attribute not supported "
4978 "in this configuration; ignored");
4982 /* A helper function to call assemble_visibility when needed for a decl. */
4985 maybe_assemble_visibility (tree decl)
4987 enum symbol_visibility vis = DECL_VISIBILITY (decl);
4989 if (vis != VISIBILITY_DEFAULT)
4990 targetm.asm_out.visibility (decl, vis);
4993 /* Returns 1 if the target configuration supports defining public symbols
4994 so that one of them will be chosen at link time instead of generating a
4995 multiply-defined symbol error, whether through the use of weak symbols or
4996 a target-specific mechanism for having duplicates discarded. */
4999 supports_one_only (void)
5001 if (SUPPORTS_ONE_ONLY)
5003 return SUPPORTS_WEAK;
5006 /* Set up DECL as a public symbol that can be defined in multiple
5007 translation units without generating a linker error. */
5010 make_decl_one_only (tree decl)
5012 gcc_assert (TREE_CODE (decl) == VAR_DECL
5013 || TREE_CODE (decl) == FUNCTION_DECL);
5015 TREE_PUBLIC (decl) = 1;
5017 if (SUPPORTS_ONE_ONLY)
5019 #ifdef MAKE_DECL_ONE_ONLY
5020 MAKE_DECL_ONE_ONLY (decl);
5022 DECL_ONE_ONLY (decl) = 1;
5024 else if (TREE_CODE (decl) == VAR_DECL
5025 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
5026 DECL_COMMON (decl) = 1;
5029 gcc_assert (SUPPORTS_WEAK);
5030 DECL_WEAK (decl) = 1;
5035 init_varasm_once (void)
5037 section_htab = htab_create_ggc (31, section_entry_hash,
5038 section_entry_eq, NULL);
5039 object_block_htab = htab_create_ggc (31, object_block_entry_hash,
5040 object_block_entry_eq, NULL);
5041 const_desc_htab = htab_create_ggc (1009, const_desc_hash,
5042 const_desc_eq, NULL);
5044 const_alias_set = new_alias_set ();
5046 #ifdef TEXT_SECTION_ASM_OP
5047 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
5048 TEXT_SECTION_ASM_OP);
5051 #ifdef DATA_SECTION_ASM_OP
5052 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5053 DATA_SECTION_ASM_OP);
5056 #ifdef SDATA_SECTION_ASM_OP
5057 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5058 SDATA_SECTION_ASM_OP);
5061 #ifdef READONLY_DATA_SECTION_ASM_OP
5062 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
5063 READONLY_DATA_SECTION_ASM_OP);
5066 #ifdef CTORS_SECTION_ASM_OP
5067 ctors_section = get_unnamed_section (0, output_section_asm_op,
5068 CTORS_SECTION_ASM_OP);
5071 #ifdef DTORS_SECTION_ASM_OP
5072 dtors_section = get_unnamed_section (0, output_section_asm_op,
5073 DTORS_SECTION_ASM_OP);
5076 #ifdef BSS_SECTION_ASM_OP
5077 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5078 output_section_asm_op,
5079 BSS_SECTION_ASM_OP);
5082 #ifdef SBSS_SECTION_ASM_OP
5083 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5084 output_section_asm_op,
5085 SBSS_SECTION_ASM_OP);
5088 targetm.asm_out.init_sections ();
5090 if (readonly_data_section == NULL)
5091 readonly_data_section = text_section;
5095 decl_default_tls_model (tree decl)
5097 enum tls_model kind;
5100 is_local = targetm.binds_local_p (decl);
5104 kind = TLS_MODEL_LOCAL_EXEC;
5106 kind = TLS_MODEL_INITIAL_EXEC;
5109 /* Local dynamic is inefficient when we're not combining the
5110 parts of the address. */
5111 else if (optimize && is_local)
5112 kind = TLS_MODEL_LOCAL_DYNAMIC;
5114 kind = TLS_MODEL_GLOBAL_DYNAMIC;
5115 if (kind < flag_tls_default)
5116 kind = flag_tls_default;
5121 /* Select a set of attributes for section NAME based on the properties
5122 of DECL and whether or not RELOC indicates that DECL's initializer
5123 might contain runtime relocations.
5125 We make the section read-only and executable for a function decl,
5126 read-only for a const data decl, and writable for a non-const data decl. */
5129 default_section_type_flags (tree decl, const char *name, int reloc)
5131 return default_section_type_flags_1 (decl, name, reloc, flag_pic);
5135 default_section_type_flags_1 (tree decl, const char *name, int reloc,
5140 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
5141 flags = SECTION_CODE;
5142 else if (decl && decl_readonly_section_1 (decl, reloc, shlib))
5144 else if (current_function_decl
5146 && cfun->unlikely_text_section_name
5147 && strcmp (name, cfun->unlikely_text_section_name) == 0)
5148 flags = SECTION_CODE;
5150 && (!current_function_decl || !cfun)
5151 && strcmp (name, UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
5152 flags = SECTION_CODE;
5154 flags = SECTION_WRITE;
5156 if (decl && DECL_ONE_ONLY (decl))
5157 flags |= SECTION_LINKONCE;
5159 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5160 flags |= SECTION_TLS | SECTION_WRITE;
5162 if (strcmp (name, ".bss") == 0
5163 || strncmp (name, ".bss.", 5) == 0
5164 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
5165 || strcmp (name, ".sbss") == 0
5166 || strncmp (name, ".sbss.", 6) == 0
5167 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
5168 flags |= SECTION_BSS;
5170 if (strcmp (name, ".tdata") == 0
5171 || strncmp (name, ".tdata.", 7) == 0
5172 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
5173 flags |= SECTION_TLS;
5175 if (strcmp (name, ".tbss") == 0
5176 || strncmp (name, ".tbss.", 6) == 0
5177 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
5178 flags |= SECTION_TLS | SECTION_BSS;
5180 /* These three sections have special ELF types. They are neither
5181 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5182 want to print a section type (@progbits or @nobits). If someone
5183 is silly enough to emit code or TLS variables to one of these
5184 sections, then don't handle them specially. */
5185 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
5186 && (strcmp (name, ".init_array") == 0
5187 || strcmp (name, ".fini_array") == 0
5188 || strcmp (name, ".preinit_array") == 0))
5189 flags |= SECTION_NOTYPE;
5194 /* Output assembly to switch to section NAME with attribute FLAGS.
5195 Four variants for common object file formats. */
5198 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
5199 unsigned int flags ATTRIBUTE_UNUSED,
5200 tree decl ATTRIBUTE_UNUSED)
5202 /* Some object formats don't support named sections at all. The
5203 front-end should already have flagged this as an error. */
5208 default_elf_asm_named_section (const char *name, unsigned int flags,
5209 tree decl ATTRIBUTE_UNUSED)
5211 char flagchars[10], *f = flagchars;
5213 /* If we have already declared this section, we can use an
5214 abbreviated form to switch back to it -- unless this section is
5215 part of a COMDAT groups, in which case GAS requires the full
5216 declaration every time. */
5217 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5218 && (flags & SECTION_DECLARED))
5220 fprintf (asm_out_file, "\t.section\t%s\n", name);
5224 if (!(flags & SECTION_DEBUG))
5226 if (flags & SECTION_WRITE)
5228 if (flags & SECTION_CODE)
5230 if (flags & SECTION_SMALL)
5232 if (flags & SECTION_MERGE)
5234 if (flags & SECTION_STRINGS)
5236 if (flags & SECTION_TLS)
5238 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5242 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
5244 if (!(flags & SECTION_NOTYPE))
5249 if (flags & SECTION_BSS)
5255 #ifdef ASM_COMMENT_START
5256 /* On platforms that use "@" as the assembly comment character,
5258 if (strcmp (ASM_COMMENT_START, "@") == 0)
5261 fprintf (asm_out_file, format, type);
5263 if (flags & SECTION_ENTSIZE)
5264 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
5265 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5266 fprintf (asm_out_file, ",%s,comdat",
5267 lang_hooks.decls.comdat_group (decl));
5270 putc ('\n', asm_out_file);
5274 default_coff_asm_named_section (const char *name, unsigned int flags,
5275 tree decl ATTRIBUTE_UNUSED)
5277 char flagchars[8], *f = flagchars;
5279 if (flags & SECTION_WRITE)
5281 if (flags & SECTION_CODE)
5285 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
5289 default_pe_asm_named_section (const char *name, unsigned int flags,
5292 default_coff_asm_named_section (name, flags, decl);
5294 if (flags & SECTION_LINKONCE)
5296 /* Functions may have been compiled at various levels of
5297 optimization so we can't use `same_size' here.
5298 Instead, have the linker pick one. */
5299 fprintf (asm_out_file, "\t.linkonce %s\n",
5300 (flags & SECTION_CODE ? "discard" : "same_size"));
5304 /* The lame default section selector. */
5307 default_select_section (tree decl, int reloc,
5308 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
5312 if (decl_readonly_section (decl, reloc))
5313 return readonly_data_section;
5315 else if (TREE_CODE (decl) == CONSTRUCTOR)
5317 if (! ((flag_pic && reloc)
5318 || !TREE_READONLY (decl)
5319 || TREE_SIDE_EFFECTS (decl)
5320 || !TREE_CONSTANT (decl)))
5321 return readonly_data_section;
5323 else if (TREE_CODE (decl) == STRING_CST)
5324 return readonly_data_section;
5325 else if (! (flag_pic && reloc))
5326 return readonly_data_section;
5328 return data_section;
5331 enum section_category
5332 categorize_decl_for_section (tree decl, int reloc, int shlib)
5334 enum section_category ret;
5336 if (TREE_CODE (decl) == FUNCTION_DECL)
5338 else if (TREE_CODE (decl) == STRING_CST)
5340 if (flag_mudflap) /* or !flag_merge_constants */
5341 return SECCAT_RODATA;
5343 return SECCAT_RODATA_MERGE_STR;
5345 else if (TREE_CODE (decl) == VAR_DECL)
5347 if (DECL_INITIAL (decl) == NULL
5348 || DECL_INITIAL (decl) == error_mark_node
5349 || (flag_zero_initialized_in_bss
5350 /* Leave constant zeroes in .rodata so they can be shared. */
5351 && !TREE_READONLY (decl)
5352 && initializer_zerop (DECL_INITIAL (decl))))
5354 else if (! TREE_READONLY (decl)
5355 || TREE_SIDE_EFFECTS (decl)
5356 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
5358 if (shlib && (reloc & 2))
5359 ret = SECCAT_DATA_REL;
5360 else if (shlib && reloc)
5361 ret = SECCAT_DATA_REL_LOCAL;
5365 else if (shlib && (reloc & 2))
5366 ret = SECCAT_DATA_REL_RO;
5367 else if (shlib && reloc)
5368 ret = SECCAT_DATA_REL_RO_LOCAL;
5369 else if (reloc || flag_merge_constants < 2)
5370 /* C and C++ don't allow different variables to share the same
5371 location. -fmerge-all-constants allows even that (at the
5372 expense of not conforming). */
5373 ret = SECCAT_RODATA;
5374 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
5375 ret = SECCAT_RODATA_MERGE_STR_INIT;
5377 ret = SECCAT_RODATA_MERGE_CONST;
5379 else if (TREE_CODE (decl) == CONSTRUCTOR)
5381 if ((shlib && reloc)
5382 || TREE_SIDE_EFFECTS (decl)
5383 || ! TREE_CONSTANT (decl))
5386 ret = SECCAT_RODATA;
5389 ret = SECCAT_RODATA;
5391 /* There are no read-only thread-local sections. */
5392 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5394 /* Note that this would be *just* SECCAT_BSS, except that there's
5395 no concept of a read-only thread-local-data section. */
5396 if (ret == SECCAT_BSS
5397 || (flag_zero_initialized_in_bss
5398 && initializer_zerop (DECL_INITIAL (decl))))
5404 /* If the target uses small data sections, select it. */
5405 else if (targetm.in_small_data_p (decl))
5407 if (ret == SECCAT_BSS)
5409 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
5410 ret = SECCAT_SRODATA;
5419 decl_readonly_section (tree decl, int reloc)
5421 return decl_readonly_section_1 (decl, reloc, flag_pic);
5425 decl_readonly_section_1 (tree decl, int reloc, int shlib)
5427 switch (categorize_decl_for_section (decl, reloc, shlib))
5430 case SECCAT_RODATA_MERGE_STR:
5431 case SECCAT_RODATA_MERGE_STR_INIT:
5432 case SECCAT_RODATA_MERGE_CONST:
5433 case SECCAT_SRODATA:
5442 /* Select a section based on the above categorization. */
5445 default_elf_select_section (tree decl, int reloc,
5446 unsigned HOST_WIDE_INT align)
5448 return default_elf_select_section_1 (decl, reloc, align, flag_pic);
5452 default_elf_select_section_1 (tree decl, int reloc,
5453 unsigned HOST_WIDE_INT align, int shlib)
5456 switch (categorize_decl_for_section (decl, reloc, shlib))
5459 /* We're not supposed to be called on FUNCTION_DECLs. */
5462 return readonly_data_section;
5463 case SECCAT_RODATA_MERGE_STR:
5464 return mergeable_string_section (decl, align, 0);
5465 case SECCAT_RODATA_MERGE_STR_INIT:
5466 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
5467 case SECCAT_RODATA_MERGE_CONST:
5468 return mergeable_constant_section (DECL_MODE (decl), align, 0);
5469 case SECCAT_SRODATA:
5473 return data_section;
5474 case SECCAT_DATA_REL:
5475 sname = ".data.rel";
5477 case SECCAT_DATA_REL_LOCAL:
5478 sname = ".data.rel.local";
5480 case SECCAT_DATA_REL_RO:
5481 sname = ".data.rel.ro";
5483 case SECCAT_DATA_REL_RO_LOCAL:
5484 sname = ".data.rel.ro.local";
5509 return get_named_section (decl, sname, reloc);
5512 /* Construct a unique section name based on the decl name and the
5513 categorization performed above. */
5516 default_unique_section (tree decl, int reloc)
5518 default_unique_section_1 (decl, reloc, flag_pic);
5522 default_unique_section_1 (tree decl, int reloc, int shlib)
5524 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
5525 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
5526 const char *prefix, *name;
5530 switch (categorize_decl_for_section (decl, reloc, shlib))
5533 prefix = one_only ? ".gnu.linkonce.t." : ".text.";
5536 case SECCAT_RODATA_MERGE_STR:
5537 case SECCAT_RODATA_MERGE_STR_INIT:
5538 case SECCAT_RODATA_MERGE_CONST:
5539 prefix = one_only ? ".gnu.linkonce.r." : ".rodata.";
5541 case SECCAT_SRODATA:
5542 prefix = one_only ? ".gnu.linkonce.s2." : ".sdata2.";
5545 prefix = one_only ? ".gnu.linkonce.d." : ".data.";
5547 case SECCAT_DATA_REL:
5548 prefix = one_only ? ".gnu.linkonce.d.rel." : ".data.rel.";
5550 case SECCAT_DATA_REL_LOCAL:
5551 prefix = one_only ? ".gnu.linkonce.d.rel.local." : ".data.rel.local.";
5553 case SECCAT_DATA_REL_RO:
5554 prefix = one_only ? ".gnu.linkonce.d.rel.ro." : ".data.rel.ro.";
5556 case SECCAT_DATA_REL_RO_LOCAL:
5557 prefix = one_only ? ".gnu.linkonce.d.rel.ro.local."
5558 : ".data.rel.ro.local.";
5561 prefix = one_only ? ".gnu.linkonce.s." : ".sdata.";
5564 prefix = one_only ? ".gnu.linkonce.b." : ".bss.";
5567 prefix = one_only ? ".gnu.linkonce.sb." : ".sbss.";
5570 prefix = one_only ? ".gnu.linkonce.td." : ".tdata.";
5573 prefix = one_only ? ".gnu.linkonce.tb." : ".tbss.";
5578 plen = strlen (prefix);
5580 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5581 name = targetm.strip_name_encoding (name);
5582 nlen = strlen (name);
5584 string = alloca (nlen + plen + 1);
5585 memcpy (string, prefix, plen);
5586 memcpy (string + plen, name, nlen + 1);
5588 DECL_SECTION_NAME (decl) = build_string (nlen + plen, string);
5592 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED,
5594 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
5597 switch (GET_CODE (x))
5602 return data_section;
5608 return readonly_data_section;
5612 default_elf_select_rtx_section (enum machine_mode mode, rtx x,
5613 unsigned HOST_WIDE_INT align)
5615 /* ??? Handle small data here somehow. */
5618 switch (GET_CODE (x))
5622 return get_named_section (NULL, ".data.rel.ro", 3);
5625 return get_named_section (NULL, ".data.rel.ro.local", 1);
5631 return mergeable_constant_section (mode, align, 0);
5634 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
5637 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
5642 /* Careful not to prod global register variables. */
5645 symbol = XEXP (rtl, 0);
5646 if (GET_CODE (symbol) != SYMBOL_REF)
5649 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_IN_BLOCK;
5650 if (TREE_CODE (decl) == FUNCTION_DECL)
5651 flags |= SYMBOL_FLAG_FUNCTION;
5652 if (targetm.binds_local_p (decl))
5653 flags |= SYMBOL_FLAG_LOCAL;
5654 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5655 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
5656 else if (targetm.in_small_data_p (decl))
5657 flags |= SYMBOL_FLAG_SMALL;
5658 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
5659 being PUBLIC, the thing *must* be defined in this translation unit.
5660 Prevent this buglet from being propagated into rtl code as well. */
5661 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
5662 flags |= SYMBOL_FLAG_EXTERNAL;
5664 SYMBOL_REF_FLAGS (symbol) = flags;
5667 /* By default, we do nothing for encode_section_info, so we need not
5668 do anything but discard the '*' marker. */
5671 default_strip_name_encoding (const char *str)
5673 return str + (*str == '*');
5676 #ifdef ASM_OUTPUT_DEF
5677 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
5678 anchor relative to ".", the current section position. */
5681 default_asm_output_anchor (rtx symbol)
5685 sprintf (buffer, ". + " HOST_WIDE_INT_PRINT_DEC,
5686 SYMBOL_REF_BLOCK_OFFSET (symbol));
5687 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
5691 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
5694 default_use_anchors_for_symbol_p (rtx symbol)
5699 /* Don't use anchors for mergeable sections. The linker might move
5700 the objects around. */
5701 sect = SYMBOL_REF_BLOCK (symbol)->sect;
5702 if (sect->common.flags & SECTION_MERGE)
5705 /* Don't use anchors for small data sections. The small data register
5706 acts as an anchor for such sections. */
5707 if (sect->common.flags & SECTION_SMALL)
5710 decl = SYMBOL_REF_DECL (symbol);
5711 if (decl && DECL_P (decl))
5713 /* Don't use section anchors for decls that might be defined by
5715 if (!targetm.binds_local_p (decl))
5718 /* Don't use section anchors for decls that will be placed in a
5719 small data section. */
5720 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
5721 one above. The problem is that we only use SECTION_SMALL for
5722 sections that should be marked as small in the section directive. */
5723 if (targetm.in_small_data_p (decl))
5729 /* Assume ELF-ish defaults, since that's pretty much the most liberal
5730 wrt cross-module name binding. */
5733 default_binds_local_p (tree exp)
5735 return default_binds_local_p_1 (exp, flag_shlib);
5739 default_binds_local_p_1 (tree exp, int shlib)
5743 /* A non-decl is an entry in the constant pool. */
5746 /* Weakrefs may not bind locally, even though the weakref itself is
5747 always static and therefore local. */
5748 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp)))
5750 /* Static variables are always local. */
5751 else if (! TREE_PUBLIC (exp))
5753 /* A variable is local if the user has said explicitly that it will
5755 else if (DECL_VISIBILITY_SPECIFIED (exp)
5756 && DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
5758 /* Variables defined outside this object might not be local. */
5759 else if (DECL_EXTERNAL (exp))
5761 /* If defined in this object and visibility is not default, must be
5763 else if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
5765 /* Default visibility weak data can be overridden by a strong symbol
5766 in another module and so are not local. */
5767 else if (DECL_WEAK (exp))
5769 /* If PIC, then assume that any global name can be overridden by
5770 symbols resolved from other modules. */
5773 /* Uninitialized COMMON variable may be unified with symbols
5774 resolved from other modules. */
5775 else if (DECL_COMMON (exp)
5776 && (DECL_INITIAL (exp) == NULL
5777 || DECL_INITIAL (exp) == error_mark_node))
5779 /* Otherwise we're left with initialized (or non-common) global data
5780 which is of necessity defined locally. */
5787 /* Determine whether or not a pointer mode is valid. Assume defaults
5788 of ptr_mode or Pmode - can be overridden. */
5790 default_valid_pointer_mode (enum machine_mode mode)
5792 return (mode == ptr_mode || mode == Pmode);
5795 /* Default function to output code that will globalize a label. A
5796 target must define GLOBAL_ASM_OP or provide its own function to
5797 globalize a label. */
5798 #ifdef GLOBAL_ASM_OP
5800 default_globalize_label (FILE * stream, const char *name)
5802 fputs (GLOBAL_ASM_OP, stream);
5803 assemble_name (stream, name);
5804 putc ('\n', stream);
5806 #endif /* GLOBAL_ASM_OP */
5808 /* Default function to output a label for unwind information. The
5809 default is to do nothing. A target that needs nonlocal labels for
5810 unwind information must provide its own function to do this. */
5812 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
5813 tree decl ATTRIBUTE_UNUSED,
5814 int for_eh ATTRIBUTE_UNUSED,
5815 int empty ATTRIBUTE_UNUSED)
5819 /* Default function to output a label to divide up the exception table.
5820 The default is to do nothing. A target that needs/wants to divide
5821 up the table must provide it's own function to do this. */
5823 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
5827 /* This is how to output an internal numbered label where PREFIX is
5828 the class of label and LABELNO is the number within the class. */
5831 default_internal_label (FILE *stream, const char *prefix,
5832 unsigned long labelno)
5834 char *const buf = alloca (40 + strlen (prefix));
5835 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
5836 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
5839 /* This is the default behavior at the beginning of a file. It's
5840 controlled by two other target-hook toggles. */
5842 default_file_start (void)
5844 if (targetm.file_start_app_off && !flag_verbose_asm)
5845 fputs (ASM_APP_OFF, asm_out_file);
5847 if (targetm.file_start_file_directive)
5848 output_file_directive (asm_out_file, main_input_filename);
5851 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
5852 which emits a special section directive used to indicate whether or
5853 not this object file needs an executable stack. This is primarily
5854 a GNU extension to ELF but could be used on other targets. */
5856 int trampolines_created;
5859 file_end_indicate_exec_stack (void)
5861 unsigned int flags = SECTION_DEBUG;
5862 if (trampolines_created)
5863 flags |= SECTION_CODE;
5865 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
5868 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
5869 a get_unnamed_section callback. */
5872 output_section_asm_op (const void *directive)
5874 fprintf (asm_out_file, "%s\n", (const char *) directive);
5877 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
5878 the current section is NEW_SECTION. */
5881 switch_to_section (section *new_section)
5883 if (in_section == new_section)
5886 if (new_section->common.flags & SECTION_FORGET)
5889 in_section = new_section;
5891 if (new_section->common.flags & SECTION_NAMED)
5894 && !cfun->unlikely_text_section_name
5895 && strcmp (new_section->named.name,
5896 UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
5897 cfun->unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
5899 targetm.asm_out.named_section (new_section->named.name,
5900 new_section->named.common.flags,
5901 new_section->named.decl);
5904 new_section->unnamed.callback (new_section->unnamed.data);
5906 new_section->common.flags |= SECTION_DECLARED;
5909 /* If block symbol SYMBOL has not yet been assigned an offset, place
5910 it at the end of its block. */
5913 place_block_symbol (rtx symbol)
5915 unsigned HOST_WIDE_INT size, mask, offset;
5916 struct constant_descriptor_rtx *desc;
5917 unsigned int alignment;
5918 struct object_block *block;
5921 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
5924 /* Work out the symbol's size and alignment. */
5925 if (CONSTANT_POOL_ADDRESS_P (symbol))
5927 desc = SYMBOL_REF_CONSTANT (symbol);
5928 alignment = desc->align;
5929 size = GET_MODE_SIZE (desc->mode);
5931 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
5933 decl = SYMBOL_REF_DECL (symbol);
5934 alignment = get_constant_alignment (decl);
5935 size = get_constant_size (decl);
5939 decl = SYMBOL_REF_DECL (symbol);
5940 alignment = DECL_ALIGN (decl);
5941 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
5944 /* Calculate the object's offset from the start of the block. */
5945 block = SYMBOL_REF_BLOCK (symbol);
5946 mask = alignment / BITS_PER_UNIT - 1;
5947 offset = (block->size + mask) & ~mask;
5948 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
5950 /* Record the block's new alignment and size. */
5951 block->alignment = MAX (block->alignment, alignment);
5952 block->size = offset + size;
5954 VEC_safe_push (rtx, gc, block->objects, symbol);
5957 /* Return the anchor that should be used to address byte offset OFFSET
5958 from the first object in BLOCK. MODEL is the TLS model used
5962 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
5963 enum tls_model model)
5966 unsigned int begin, middle, end;
5967 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
5970 /* Work out the anchor's offset. Use an offset of 0 for the first
5971 anchor so that we don't pessimize the case where we take the address
5972 of a variable at the beginning of the block. This is particularly
5973 useful when a block has only one variable assigned to it.
5975 We try to place anchors RANGE bytes apart, so there can then be
5976 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
5977 a ptr_mode offset. With some target settings, the lowest such
5978 anchor might be out of range for the lowest ptr_mode offset;
5979 likewise the highest anchor for the highest offset. Use anchors
5980 at the extreme ends of the ptr_mode range in such cases.
5982 All arithmetic uses unsigned integers in order to avoid
5984 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
5985 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
5986 range = max_offset - min_offset + 1;
5991 bias = 1 << (GET_MODE_BITSIZE (ptr_mode) - 1);
5994 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
5995 delta -= delta % range;
5998 offset = (HOST_WIDE_INT) (-delta);
6002 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
6003 delta -= delta % range;
6004 if (delta > bias - 1)
6006 offset = (HOST_WIDE_INT) delta;
6010 /* Do a binary search to see if there's already an anchor we can use.
6011 Set BEGIN to the new anchor's index if not. */
6013 end = VEC_length (rtx, block->anchors);
6014 while (begin != end)
6016 middle = (end + begin) / 2;
6017 anchor = VEC_index (rtx, block->anchors, middle);
6018 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
6020 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
6022 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
6024 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
6030 /* Create a new anchor with a unique label. */
6031 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
6032 anchor = create_block_symbol (ggc_strdup (label), block, offset);
6033 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
6034 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
6036 /* Insert it at index BEGIN. */
6037 VEC_safe_insert (rtx, gc, block->anchors, begin, anchor);
6041 /* Output the objects in BLOCK. */
6044 output_object_block (struct object_block *block)
6046 struct constant_descriptor_rtx *desc;
6048 HOST_WIDE_INT offset;
6052 if (block->objects == NULL)
6055 /* Switch to the section and make sure that the first byte is
6056 suitably aligned. */
6057 switch_to_section (block->sect);
6058 assemble_align (block->alignment);
6060 /* Define the values of all anchors relative to the current section
6062 for (i = 0; VEC_iterate (rtx, block->anchors, i, symbol); i++)
6063 targetm.asm_out.output_anchor (symbol);
6065 /* Output the objects themselves. */
6067 for (i = 0; VEC_iterate (rtx, block->objects, i, symbol); i++)
6069 /* Move to the object's offset, padding with zeros if necessary. */
6070 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
6071 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
6072 if (CONSTANT_POOL_ADDRESS_P (symbol))
6074 desc = SYMBOL_REF_CONSTANT (symbol);
6075 output_constant_pool_1 (desc, 1);
6076 offset += GET_MODE_SIZE (desc->mode);
6078 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6080 decl = SYMBOL_REF_DECL (symbol);
6081 assemble_constant_contents (decl, XSTR (symbol, 0),
6082 get_constant_alignment (decl));
6083 offset += get_constant_size (decl);
6087 decl = SYMBOL_REF_DECL (symbol);
6088 assemble_variable_contents (decl, XSTR (symbol, 0), false);
6089 offset += tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6094 /* A htab_traverse callback used to call output_object_block for
6095 each member of object_block_htab. */
6098 output_object_block_htab (void **slot, void *data ATTRIBUTE_UNUSED)
6100 output_object_block ((struct object_block *) (*slot));
6104 /* Output the definitions of all object_blocks. */
6107 output_object_blocks (void)
6109 htab_traverse (object_block_htab, output_object_block_htab, NULL);
6112 #include "gt-varasm.h"