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 /* Switch to section for variable DECL. RELOC is the same as the
624 argument to SELECT_SECTION. */
627 variable_section (tree decl, int reloc)
629 if (IN_NAMED_SECTION (decl))
630 switch_to_section (get_named_section (decl, NULL, reloc));
632 switch_to_section (targetm.asm_out.select_section (decl, reloc,
636 /* Return the section to use for string merging. */
639 mergeable_string_section (tree decl ATTRIBUTE_UNUSED,
640 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
641 unsigned int flags ATTRIBUTE_UNUSED)
643 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
644 && TREE_CODE (decl) == STRING_CST
645 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
647 && TREE_STRING_LENGTH (decl) >= int_size_in_bytes (TREE_TYPE (decl)))
649 enum machine_mode mode;
650 unsigned int modesize;
655 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (decl)));
656 modesize = GET_MODE_BITSIZE (mode);
657 if (modesize >= 8 && modesize <= 256
658 && (modesize & (modesize - 1)) == 0)
660 if (align < modesize)
663 str = TREE_STRING_POINTER (decl);
664 len = TREE_STRING_LENGTH (decl);
665 unit = GET_MODE_SIZE (mode);
667 /* Check for embedded NUL characters. */
668 for (i = 0; i < len; i += unit)
670 for (j = 0; j < unit; j++)
671 if (str[i + j] != '\0')
678 sprintf (name, ".rodata.str%d.%d", modesize / 8,
680 flags |= (modesize / 8) | SECTION_MERGE | SECTION_STRINGS;
681 return get_section (name, flags, NULL);
686 return readonly_data_section;
689 /* Return the section to use for constant merging. */
692 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED,
693 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
694 unsigned int flags ATTRIBUTE_UNUSED)
696 unsigned int modesize = GET_MODE_BITSIZE (mode);
698 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
704 && (align & (align - 1)) == 0)
708 sprintf (name, ".rodata.cst%d", (int) (align / 8));
709 flags |= (align / 8) | SECTION_MERGE;
710 return get_section (name, flags, NULL);
712 return readonly_data_section;
715 /* Given NAME, a putative register name, discard any customary prefixes. */
718 strip_reg_name (const char *name)
720 #ifdef REGISTER_PREFIX
721 if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
722 name += strlen (REGISTER_PREFIX);
724 if (name[0] == '%' || name[0] == '#')
729 /* The user has asked for a DECL to have a particular name. Set (or
730 change) it in such a way that we don't prefix an underscore to
733 set_user_assembler_name (tree decl, const char *name)
735 char *starred = alloca (strlen (name) + 2);
737 strcpy (starred + 1, name);
738 change_decl_assembler_name (decl, get_identifier (starred));
739 SET_DECL_RTL (decl, NULL_RTX);
742 /* Decode an `asm' spec for a declaration as a register name.
743 Return the register number, or -1 if nothing specified,
744 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
745 or -3 if ASMSPEC is `cc' and is not recognized,
746 or -4 if ASMSPEC is `memory' and is not recognized.
747 Accept an exact spelling or a decimal number.
748 Prefixes such as % are optional. */
751 decode_reg_name (const char *asmspec)
757 /* Get rid of confusing prefixes. */
758 asmspec = strip_reg_name (asmspec);
760 /* Allow a decimal number as a "register name". */
761 for (i = strlen (asmspec) - 1; i >= 0; i--)
762 if (! ISDIGIT (asmspec[i]))
764 if (asmspec[0] != 0 && i < 0)
767 if (i < FIRST_PSEUDO_REGISTER && i >= 0)
773 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
775 && ! strcmp (asmspec, strip_reg_name (reg_names[i])))
778 #ifdef ADDITIONAL_REGISTER_NAMES
780 static const struct { const char *const name; const int number; } table[]
781 = ADDITIONAL_REGISTER_NAMES;
783 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
785 && ! strcmp (asmspec, table[i].name))
786 return table[i].number;
788 #endif /* ADDITIONAL_REGISTER_NAMES */
790 if (!strcmp (asmspec, "memory"))
793 if (!strcmp (asmspec, "cc"))
802 /* Return true if it is possible to put DECL in an object_block. */
805 use_blocks_for_decl_p (tree decl)
807 /* Only data DECLs can be placed into object blocks. */
808 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != CONST_DECL)
811 if (TREE_CODE (decl) == VAR_DECL)
813 /* The object must be defined in this translation unit. */
814 if (DECL_EXTERNAL (decl))
817 /* There's no point using object blocks for something that is
818 isolated by definition. */
819 if (DECL_ONE_ONLY (decl))
822 /* Symbols that use .common cannot be put into blocks. */
823 if (DECL_COMMON (decl) && DECL_INITIAL (decl) == NULL)
827 /* We can only calculate block offsets if the decl has a known
829 if (DECL_SIZE_UNIT (decl) == NULL)
831 if (!host_integerp (DECL_SIZE_UNIT (decl), 1))
834 /* Detect decls created by dw2_force_const_mem. Such decls are
835 special because DECL_INITIAL doesn't specify the decl's true value.
836 dw2_output_indirect_constants will instead call assemble_variable
837 with dont_output_data set to 1 and then print the contents itself. */
838 if (DECL_INITIAL (decl) == decl)
844 /* Make sure block symbol SYMBOL is in section SECT, moving it to a
845 different block if necessary. */
848 change_symbol_section (rtx symbol, section *sect)
850 if (sect != SYMBOL_REF_BLOCK (symbol)->sect)
852 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol) < 0);
853 SYMBOL_REF_BLOCK (symbol) = get_block_for_section (sect);
857 /* Return the section into which the given VAR_DECL or CONST_DECL
861 get_variable_section (tree decl)
865 if (DECL_INITIAL (decl) == error_mark_node)
866 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
867 else if (DECL_INITIAL (decl))
868 reloc = compute_reloc_for_constant (DECL_INITIAL (decl));
872 resolve_unique_section (decl, reloc, flag_data_sections);
873 if (IN_NAMED_SECTION (decl))
874 return get_named_section (decl, NULL, reloc);
876 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
879 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
880 have static storage duration. In other words, it should not be an
881 automatic variable, including PARM_DECLs.
883 There is, however, one exception: this function handles variables
884 explicitly placed in a particular register by the user.
886 This is never called for PARM_DECL nodes. */
889 make_decl_rtl (tree decl)
891 const char *name = 0;
895 /* Check that we are not being given an automatic variable. */
896 gcc_assert (TREE_CODE (decl) != PARM_DECL
897 && TREE_CODE (decl) != RESULT_DECL);
899 /* A weak alias has TREE_PUBLIC set but not the other bits. */
900 gcc_assert (TREE_CODE (decl) != VAR_DECL
901 || TREE_STATIC (decl)
902 || TREE_PUBLIC (decl)
903 || DECL_EXTERNAL (decl)
904 || DECL_REGISTER (decl));
906 /* And that we were not given a type or a label. */
907 gcc_assert (TREE_CODE (decl) != TYPE_DECL
908 && TREE_CODE (decl) != LABEL_DECL);
910 /* For a duplicate declaration, we can be called twice on the
911 same DECL node. Don't discard the RTL already made. */
912 if (DECL_RTL_SET_P (decl))
914 /* If the old RTL had the wrong mode, fix the mode. */
916 if (GET_MODE (x) != DECL_MODE (decl))
917 SET_DECL_RTL (decl, adjust_address_nv (x, DECL_MODE (decl), 0));
919 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
922 /* ??? Another way to do this would be to maintain a hashed
923 table of such critters. Instead of adding stuff to a DECL
924 to give certain attributes to it, we could use an external
925 hash map from DECL to set of attributes. */
927 /* Let the target reassign the RTL if it wants.
928 This is necessary, for example, when one machine specific
929 decl attribute overrides another. */
930 targetm.encode_section_info (decl, DECL_RTL (decl), false);
932 /* If the old address was assigned to an object block, see whether
933 that block is still in the right section. */
935 && GET_CODE (XEXP (x, 0)) == SYMBOL_REF
936 && SYMBOL_REF_IN_BLOCK_P (XEXP (x, 0)))
937 change_symbol_section (XEXP (x, 0), get_variable_section (decl));
939 /* Make this function static known to the mudflap runtime. */
940 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
941 mudflap_enqueue_decl (decl);
946 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
948 if (name[0] != '*' && TREE_CODE (decl) != FUNCTION_DECL
949 && DECL_REGISTER (decl))
951 error ("register name not specified for %q+D", decl);
953 else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
955 const char *asmspec = name+1;
956 reg_number = decode_reg_name (asmspec);
957 /* First detect errors in declaring global registers. */
958 if (reg_number == -1)
959 error ("register name not specified for %q+D", decl);
960 else if (reg_number < 0)
961 error ("invalid register name for %q+D", decl);
962 else if (TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
963 error ("data type of %q+D isn%'t suitable for a register",
965 else if (! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl))))
966 error ("register specified for %q+D isn%'t suitable for data type",
968 /* Now handle properly declared static register variables. */
973 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
975 DECL_INITIAL (decl) = 0;
976 error ("global register variable has initial value");
978 if (TREE_THIS_VOLATILE (decl))
979 warning (OPT_Wvolatile_register_var,
980 "optimization may eliminate reads and/or "
981 "writes to register variables");
983 /* If the user specified one of the eliminables registers here,
984 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
985 confused with that register and be eliminated. This usage is
986 somewhat suspect... */
988 SET_DECL_RTL (decl, gen_rtx_raw_REG (DECL_MODE (decl), reg_number));
989 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
990 REG_USERVAR_P (DECL_RTL (decl)) = 1;
992 if (TREE_STATIC (decl))
994 /* Make this register global, so not usable for anything
996 #ifdef ASM_DECLARE_REGISTER_GLOBAL
997 name = IDENTIFIER_POINTER (DECL_NAME (decl));
998 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
1000 nregs = hard_regno_nregs[reg_number][DECL_MODE (decl)];
1002 globalize_reg (reg_number + --nregs);
1005 /* As a register variable, it has no section. */
1009 /* Now handle ordinary static variables and functions (in memory).
1010 Also handle vars declared register invalidly. */
1011 else if (name[0] == '*')
1013 #ifdef REGISTER_PREFIX
1014 if (strlen (REGISTER_PREFIX) != 0)
1016 reg_number = decode_reg_name (name);
1017 if (reg_number >= 0 || reg_number == -3)
1018 error ("register name given for non-register variable %q+D", decl);
1023 /* Specifying a section attribute on a variable forces it into a
1024 non-.bss section, and thus it cannot be common. */
1025 if (TREE_CODE (decl) == VAR_DECL
1026 && DECL_SECTION_NAME (decl) != NULL_TREE
1027 && DECL_INITIAL (decl) == NULL_TREE
1028 && DECL_COMMON (decl))
1029 DECL_COMMON (decl) = 0;
1031 /* Variables can't be both common and weak. */
1032 if (TREE_CODE (decl) == VAR_DECL && DECL_WEAK (decl))
1033 DECL_COMMON (decl) = 0;
1035 if (use_object_blocks_p () && use_blocks_for_decl_p (decl))
1037 section *sect = get_variable_section (decl);
1038 x = create_block_symbol (name, get_block_for_section (sect), -1);
1041 x = gen_rtx_SYMBOL_REF (Pmode, name);
1042 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
1043 SET_SYMBOL_REF_DECL (x, decl);
1045 x = gen_rtx_MEM (DECL_MODE (decl), x);
1046 if (TREE_CODE (decl) != FUNCTION_DECL)
1047 set_mem_attributes (x, decl, 1);
1048 SET_DECL_RTL (decl, x);
1050 /* Optionally set flags or add text to the name to record information
1051 such as that it is a function name.
1052 If the name is changed, the macro ASM_OUTPUT_LABELREF
1053 will have to know how to strip this information. */
1054 targetm.encode_section_info (decl, DECL_RTL (decl), true);
1056 /* Make this function static known to the mudflap runtime. */
1057 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1058 mudflap_enqueue_decl (decl);
1061 /* Make the rtl for variable VAR be volatile.
1062 Use this only for static variables. */
1065 make_var_volatile (tree var)
1067 gcc_assert (MEM_P (DECL_RTL (var)));
1069 MEM_VOLATILE_P (DECL_RTL (var)) = 1;
1072 /* Output a string of literal assembler code
1073 for an `asm' keyword used between functions. */
1076 assemble_asm (tree string)
1080 if (TREE_CODE (string) == ADDR_EXPR)
1081 string = TREE_OPERAND (string, 0);
1083 fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string));
1086 /* Record an element in the table of global destructors. SYMBOL is
1087 a SYMBOL_REF of the function to be called; PRIORITY is a number
1088 between 0 and MAX_INIT_PRIORITY. */
1091 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED,
1092 int priority ATTRIBUTE_UNUSED)
1094 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1095 /* Tell GNU LD that this is part of the static destructor set.
1096 This will work for any system that uses stabs, most usefully
1098 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1099 dbxout_stab_value_label (XSTR (symbol, 0));
1101 sorry ("global destructors not supported on this target");
1106 default_named_section_asm_out_destructor (rtx symbol, int priority)
1108 const char *section = ".dtors";
1111 /* ??? This only works reliably with the GNU linker. */
1112 if (priority != DEFAULT_INIT_PRIORITY)
1114 sprintf (buf, ".dtors.%.5u",
1115 /* Invert the numbering so the linker puts us in the proper
1116 order; constructors are run from right to left, and the
1117 linker sorts in increasing order. */
1118 MAX_INIT_PRIORITY - priority);
1122 switch_to_section (get_section (section, SECTION_WRITE, NULL));
1123 assemble_align (POINTER_SIZE);
1124 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1127 #ifdef DTORS_SECTION_ASM_OP
1129 default_dtor_section_asm_out_destructor (rtx symbol,
1130 int priority ATTRIBUTE_UNUSED)
1132 switch_to_section (dtors_section);
1133 assemble_align (POINTER_SIZE);
1134 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1138 /* Likewise for global constructors. */
1141 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED,
1142 int priority ATTRIBUTE_UNUSED)
1144 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1145 /* Tell GNU LD that this is part of the static destructor set.
1146 This will work for any system that uses stabs, most usefully
1148 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1149 dbxout_stab_value_label (XSTR (symbol, 0));
1151 sorry ("global constructors not supported on this target");
1156 default_named_section_asm_out_constructor (rtx symbol, int priority)
1158 const char *section = ".ctors";
1161 /* ??? This only works reliably with the GNU linker. */
1162 if (priority != DEFAULT_INIT_PRIORITY)
1164 sprintf (buf, ".ctors.%.5u",
1165 /* Invert the numbering so the linker puts us in the proper
1166 order; constructors are run from right to left, and the
1167 linker sorts in increasing order. */
1168 MAX_INIT_PRIORITY - priority);
1172 switch_to_section (get_section (section, SECTION_WRITE, NULL));
1173 assemble_align (POINTER_SIZE);
1174 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1177 #ifdef CTORS_SECTION_ASM_OP
1179 default_ctor_section_asm_out_constructor (rtx symbol,
1180 int priority ATTRIBUTE_UNUSED)
1182 switch_to_section (ctors_section);
1183 assemble_align (POINTER_SIZE);
1184 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1188 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1189 a nonzero value if the constant pool should be output before the
1190 start of the function, or a zero value if the pool should output
1191 after the end of the function. The default is to put it before the
1194 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1195 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1198 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1199 to be output to assembler.
1200 Set first_global_object_name and weak_global_object_name as appropriate. */
1203 notice_global_symbol (tree decl)
1205 const char **type = &first_global_object_name;
1207 if (first_global_object_name
1208 || !TREE_PUBLIC (decl) || DECL_EXTERNAL (decl)
1209 || !DECL_NAME (decl)
1210 || (TREE_CODE (decl) != FUNCTION_DECL
1211 && (TREE_CODE (decl) != VAR_DECL
1212 || (DECL_COMMON (decl)
1213 && (DECL_INITIAL (decl) == 0
1214 || DECL_INITIAL (decl) == error_mark_node))))
1215 || !MEM_P (DECL_RTL (decl)))
1218 /* We win when global object is found, but it is useful to know about weak
1219 symbol as well so we can produce nicer unique names. */
1220 if (DECL_WEAK (decl) || DECL_ONE_ONLY (decl))
1221 type = &weak_global_object_name;
1227 rtx decl_rtl = DECL_RTL (decl);
1229 p = targetm.strip_name_encoding (XSTR (XEXP (decl_rtl, 0), 0));
1230 name = ggc_strdup (p);
1236 /* Output assembler code for the constant pool of a function and associated
1237 with defining the name of the function. DECL describes the function.
1238 NAME is the function's name. For the constant pool, we use the current
1239 constant pool data. */
1242 assemble_start_function (tree decl, const char *fnname)
1245 char tmp_label[100];
1246 bool hot_label_written = false;
1248 cfun->unlikely_text_section_name = NULL;
1250 first_function_block_is_cold = false;
1251 if (flag_reorder_blocks_and_partition)
1253 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
1254 cfun->hot_section_label = ggc_strdup (tmp_label);
1255 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDB", const_labelno);
1256 cfun->cold_section_label = ggc_strdup (tmp_label);
1257 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTE", const_labelno);
1258 cfun->hot_section_end_label = ggc_strdup (tmp_label);
1259 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDE", const_labelno);
1260 cfun->cold_section_end_label = ggc_strdup (tmp_label);
1265 cfun->hot_section_label = NULL;
1266 cfun->cold_section_label = NULL;
1267 cfun->hot_section_end_label = NULL;
1268 cfun->cold_section_end_label = NULL;
1271 /* The following code does not need preprocessing in the assembler. */
1275 if (CONSTANT_POOL_BEFORE_FUNCTION)
1276 output_constant_pool (fnname, decl);
1278 resolve_unique_section (decl, 0, flag_function_sections);
1280 /* Make sure the not and cold text (code) sections are properly
1281 aligned. This is necessary here in the case where the function
1282 has both hot and cold sections, because we don't want to re-set
1283 the alignment when the section switch happens mid-function. */
1285 if (flag_reorder_blocks_and_partition)
1287 switch_to_section (unlikely_text_section ());
1288 assemble_align (FUNCTION_BOUNDARY);
1289 ASM_OUTPUT_LABEL (asm_out_file, cfun->cold_section_label);
1291 /* When the function starts with a cold section, we need to explicitly
1292 align the hot section and write out the hot section label.
1293 But if the current function is a thunk, we do not have a CFG. */
1294 if (!current_function_is_thunk
1295 && BB_PARTITION (ENTRY_BLOCK_PTR->next_bb) == BB_COLD_PARTITION)
1297 switch_to_section (text_section);
1298 assemble_align (FUNCTION_BOUNDARY);
1299 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_label);
1300 hot_label_written = true;
1301 first_function_block_is_cold = true;
1304 else if (DECL_SECTION_NAME (decl))
1306 /* Calls to function_section rely on first_function_block_is_cold
1307 being accurate. The first block may be cold even if we aren't
1308 doing partitioning, if the entire function was decided by
1309 choose_function_section (predict.c) to be cold. */
1311 initialize_cold_section_name ();
1313 if (cfun->unlikely_text_section_name
1314 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
1315 cfun->unlikely_text_section_name) == 0)
1316 first_function_block_is_cold = true;
1319 in_cold_section_p = first_function_block_is_cold;
1321 /* Switch to the correct text section for the start of the function. */
1323 switch_to_section (function_section (decl));
1324 if (flag_reorder_blocks_and_partition
1325 && !hot_label_written)
1326 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_label);
1328 /* Tell assembler to move to target machine's alignment for functions. */
1329 align = floor_log2 (FUNCTION_BOUNDARY / BITS_PER_UNIT);
1330 if (align < force_align_functions_log)
1331 align = force_align_functions_log;
1334 ASM_OUTPUT_ALIGN (asm_out_file, align);
1337 /* Handle a user-specified function alignment.
1338 Note that we still need to align to FUNCTION_BOUNDARY, as above,
1339 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1340 if (align_functions_log > align
1341 && cfun->function_frequency != FUNCTION_FREQUENCY_UNLIKELY_EXECUTED)
1343 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1344 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
1345 align_functions_log, align_functions - 1);
1347 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1351 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1352 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1355 (*debug_hooks->begin_function) (decl);
1357 /* Make function name accessible from other files, if appropriate. */
1359 if (TREE_PUBLIC (decl))
1361 notice_global_symbol (decl);
1363 globalize_decl (decl);
1365 maybe_assemble_visibility (decl);
1368 if (DECL_PRESERVE_P (decl))
1369 targetm.asm_out.mark_decl_preserved (fnname);
1371 /* Do any machine/system dependent processing of the function name. */
1372 #ifdef ASM_DECLARE_FUNCTION_NAME
1373 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1375 /* Standard thing is just output label for the function. */
1376 ASM_OUTPUT_LABEL (asm_out_file, fnname);
1377 #endif /* ASM_DECLARE_FUNCTION_NAME */
1380 /* Output assembler code associated with defining the size of the
1381 function. DECL describes the function. NAME is the function's name. */
1384 assemble_end_function (tree decl, const char *fnname)
1386 #ifdef ASM_DECLARE_FUNCTION_SIZE
1387 /* We could have switched section in the middle of the function. */
1388 if (flag_reorder_blocks_and_partition)
1389 switch_to_section (function_section (decl));
1390 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1392 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1394 output_constant_pool (fnname, decl);
1395 switch_to_section (function_section (decl)); /* need to switch back */
1397 /* Output labels for end of hot/cold text sections (to be used by
1399 if (flag_reorder_blocks_and_partition)
1401 section *save_text_section;
1403 save_text_section = in_section;
1404 switch_to_section (unlikely_text_section ());
1405 ASM_OUTPUT_LABEL (asm_out_file, cfun->cold_section_end_label);
1406 if (first_function_block_is_cold)
1407 switch_to_section (text_section);
1409 switch_to_section (function_section (decl));
1410 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_end_label);
1411 switch_to_section (save_text_section);
1415 /* Assemble code to leave SIZE bytes of zeros. */
1418 assemble_zeros (unsigned HOST_WIDE_INT size)
1420 /* Do no output if -fsyntax-only. */
1421 if (flag_syntax_only)
1424 #ifdef ASM_NO_SKIP_IN_TEXT
1425 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1426 so we must output 0s explicitly in the text section. */
1427 if (ASM_NO_SKIP_IN_TEXT && (in_section->common.flags & SECTION_CODE) != 0)
1429 unsigned HOST_WIDE_INT i;
1430 for (i = 0; i < size; i++)
1431 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1436 ASM_OUTPUT_SKIP (asm_out_file, size);
1439 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1442 assemble_align (int align)
1444 if (align > BITS_PER_UNIT)
1446 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1450 /* Assemble a string constant with the specified C string as contents. */
1453 assemble_string (const char *p, int size)
1458 /* If the string is very long, split it up. */
1462 int thissize = size - pos;
1463 if (thissize > maximum)
1466 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1474 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1475 #define ASM_EMIT_LOCAL(decl, name, size, rounded) \
1476 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name, size, DECL_ALIGN (decl))
1478 #if defined ASM_OUTPUT_ALIGNED_LOCAL
1479 #define ASM_EMIT_LOCAL(decl, name, size, rounded) \
1480 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, DECL_ALIGN (decl))
1482 #define ASM_EMIT_LOCAL(decl, name, size, rounded) \
1483 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded)
1487 #if defined ASM_OUTPUT_ALIGNED_BSS
1488 #define ASM_EMIT_BSS(decl, name, size, rounded) \
1489 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size, DECL_ALIGN (decl))
1491 #if defined ASM_OUTPUT_BSS
1492 #define ASM_EMIT_BSS(decl, name, size, rounded) \
1493 ASM_OUTPUT_BSS (asm_out_file, decl, name, size, rounded)
1499 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1500 #define ASM_EMIT_COMMON(decl, name, size, rounded) \
1501 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name, size, DECL_ALIGN (decl))
1503 #if defined ASM_OUTPUT_ALIGNED_COMMON
1504 #define ASM_EMIT_COMMON(decl, name, size, rounded) \
1505 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, DECL_ALIGN (decl))
1507 #define ASM_EMIT_COMMON(decl, name, size, rounded) \
1508 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded)
1513 asm_emit_uninitialised (tree decl, const char *name,
1514 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1515 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1523 destination = asm_dest_local;
1525 /* ??? We should handle .bss via select_section mechanisms rather than
1526 via special target hooks. That would eliminate this special case. */
1527 if (TREE_PUBLIC (decl))
1529 if (!DECL_COMMON (decl))
1531 destination = asm_dest_bss;
1536 destination = asm_dest_common;
1539 if (destination != asm_dest_common)
1541 resolve_unique_section (decl, 0, flag_data_sections);
1542 /* Custom sections don't belong here. */
1543 if (DECL_SECTION_NAME (decl))
1547 if (destination == asm_dest_bss)
1548 globalize_decl (decl);
1550 if (flag_shared_data)
1552 switch (destination)
1554 #ifdef ASM_OUTPUT_SHARED_BSS
1556 ASM_OUTPUT_SHARED_BSS (asm_out_file, decl, name, size, rounded);
1559 #ifdef ASM_OUTPUT_SHARED_COMMON
1560 case asm_dest_common:
1561 ASM_OUTPUT_SHARED_COMMON (asm_out_file, name, size, rounded);
1564 #ifdef ASM_OUTPUT_SHARED_LOCAL
1565 case asm_dest_local:
1566 ASM_OUTPUT_SHARED_LOCAL (asm_out_file, name, size, rounded);
1574 switch (destination)
1578 ASM_EMIT_BSS (decl, name, size, rounded);
1581 case asm_dest_common:
1582 ASM_EMIT_COMMON (decl, name, size, rounded);
1584 case asm_dest_local:
1585 ASM_EMIT_LOCAL (decl, name, size, rounded);
1594 /* A subroutine of assemble_variable. Output the label and contents of
1595 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1596 is as for assemble_variable. */
1599 assemble_variable_contents (tree decl, const char *name,
1600 bool dont_output_data)
1602 /* Do any machine/system dependent processing of the object. */
1603 #ifdef ASM_DECLARE_OBJECT_NAME
1604 last_assemble_variable_decl = decl;
1605 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
1607 /* Standard thing is just output label for the object. */
1608 ASM_OUTPUT_LABEL (asm_out_file, name);
1609 #endif /* ASM_DECLARE_OBJECT_NAME */
1611 if (!dont_output_data)
1613 if (DECL_INITIAL (decl)
1614 && DECL_INITIAL (decl) != error_mark_node
1615 && !initializer_zerop (DECL_INITIAL (decl)))
1616 /* Output the actual data. */
1617 output_constant (DECL_INITIAL (decl),
1618 tree_low_cst (DECL_SIZE_UNIT (decl), 1),
1621 /* Leave space for it. */
1622 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl), 1));
1626 /* Assemble everything that is needed for a variable or function declaration.
1627 Not used for automatic variables, and not used for function definitions.
1628 Should not be called for variables of incomplete structure type.
1630 TOP_LEVEL is nonzero if this variable has file scope.
1631 AT_END is nonzero if this is the special handling, at end of compilation,
1632 to define things that have had only tentative definitions.
1633 DONT_OUTPUT_DATA if nonzero means don't actually output the
1634 initial value (that will be done by the caller). */
1637 assemble_variable (tree decl, int top_level ATTRIBUTE_UNUSED,
1638 int at_end ATTRIBUTE_UNUSED, int dont_output_data)
1645 if (lang_hooks.decls.prepare_assemble_variable)
1646 lang_hooks.decls.prepare_assemble_variable (decl);
1648 last_assemble_variable_decl = 0;
1650 /* Normally no need to say anything here for external references,
1651 since assemble_external is called by the language-specific code
1652 when a declaration is first seen. */
1654 if (DECL_EXTERNAL (decl))
1657 /* Output no assembler code for a function declaration.
1658 Only definitions of functions output anything. */
1660 if (TREE_CODE (decl) == FUNCTION_DECL)
1663 /* Do nothing for global register variables. */
1664 if (DECL_RTL_SET_P (decl) && REG_P (DECL_RTL (decl)))
1666 TREE_ASM_WRITTEN (decl) = 1;
1670 /* If type was incomplete when the variable was declared,
1671 see if it is complete now. */
1673 if (DECL_SIZE (decl) == 0)
1674 layout_decl (decl, 0);
1676 /* Still incomplete => don't allocate it; treat the tentative defn
1677 (which is what it must have been) as an `extern' reference. */
1679 if (!dont_output_data && DECL_SIZE (decl) == 0)
1681 error ("storage size of %q+D isn%'t known", decl);
1682 TREE_ASM_WRITTEN (decl) = 1;
1686 /* The first declaration of a variable that comes through this function
1687 decides whether it is global (in C, has external linkage)
1688 or local (in C, has internal linkage). So do nothing more
1689 if this function has already run. */
1691 if (TREE_ASM_WRITTEN (decl))
1694 /* Make sure targetm.encode_section_info is invoked before we set
1696 decl_rtl = DECL_RTL (decl);
1698 TREE_ASM_WRITTEN (decl) = 1;
1700 /* Do no output if -fsyntax-only. */
1701 if (flag_syntax_only)
1706 if (! dont_output_data
1707 && ! host_integerp (DECL_SIZE_UNIT (decl), 1))
1709 error ("size of variable %q+D is too large", decl);
1713 gcc_assert (MEM_P (decl_rtl));
1714 gcc_assert (GET_CODE (XEXP (decl_rtl, 0)) == SYMBOL_REF);
1715 in_block_p = SYMBOL_REF_IN_BLOCK_P (XEXP (decl_rtl, 0));
1716 name = XSTR (XEXP (decl_rtl, 0), 0);
1717 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
1718 notice_global_symbol (decl);
1720 /* Compute the alignment of this data. */
1722 align = DECL_ALIGN (decl);
1724 /* In the case for initialing an array whose length isn't specified,
1725 where we have not yet been able to do the layout,
1726 figure out the proper alignment now. */
1727 if (dont_output_data && DECL_SIZE (decl) == 0
1728 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
1729 align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
1731 /* Some object file formats have a maximum alignment which they support.
1732 In particular, a.out format supports a maximum alignment of 4. */
1733 if (align > MAX_OFILE_ALIGNMENT)
1735 warning (0, "alignment of %q+D is greater than maximum object "
1736 "file alignment. Using %d", decl,
1737 MAX_OFILE_ALIGNMENT/BITS_PER_UNIT);
1738 align = MAX_OFILE_ALIGNMENT;
1741 /* On some machines, it is good to increase alignment sometimes. */
1742 if (! DECL_USER_ALIGN (decl))
1744 #ifdef DATA_ALIGNMENT
1745 align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
1747 #ifdef CONSTANT_ALIGNMENT
1748 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
1749 align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl), align);
1753 /* Reset the alignment in case we have made it tighter, so we can benefit
1754 from it in get_pointer_alignment. */
1755 DECL_ALIGN (decl) = align;
1756 set_mem_align (decl_rtl, align);
1758 if (TREE_PUBLIC (decl))
1759 maybe_assemble_visibility (decl);
1761 if (DECL_PRESERVE_P (decl))
1762 targetm.asm_out.mark_decl_preserved (name);
1764 /* Handle uninitialized definitions. */
1766 /* If the decl has been given an explicit section name, then it
1767 isn't common, and shouldn't be handled as such. */
1768 if (DECL_SECTION_NAME (decl) || dont_output_data)
1770 else if (DECL_THREAD_LOCAL_P (decl))
1772 if (DECL_COMMON (decl))
1774 #ifdef ASM_OUTPUT_TLS_COMMON
1775 unsigned HOST_WIDE_INT size;
1777 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
1778 ASM_OUTPUT_TLS_COMMON (asm_out_file, decl, name, size);
1781 sorry ("thread-local COMMON data not implemented");
1785 /* Do not handle decls as common if they will be assigned a
1786 specific section position. */
1787 else if (in_block_p)
1789 else if (DECL_INITIAL (decl) == 0
1790 || DECL_INITIAL (decl) == error_mark_node
1791 || (flag_zero_initialized_in_bss
1792 /* Leave constant zeroes in .rodata so they can be shared. */
1793 && !TREE_READONLY (decl)
1794 && initializer_zerop (DECL_INITIAL (decl))))
1796 unsigned HOST_WIDE_INT size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
1797 unsigned HOST_WIDE_INT rounded = size;
1799 /* Don't allocate zero bytes of common,
1800 since that means "undefined external" in the linker. */
1804 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1805 so that each uninitialized object starts on such a boundary. */
1806 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
1807 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1808 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1810 #if !defined(ASM_OUTPUT_ALIGNED_COMMON) && !defined(ASM_OUTPUT_ALIGNED_DECL_COMMON) && !defined(ASM_OUTPUT_ALIGNED_BSS)
1811 if ((unsigned HOST_WIDE_INT) DECL_ALIGN_UNIT (decl) > rounded)
1812 warning (0, "requested alignment for %q+D is greater than "
1813 "implemented alignment of %wu", decl, rounded);
1816 /* If the target cannot output uninitialized but not common global data
1817 in .bss, then we have to use .data, so fall through. */
1818 if (asm_emit_uninitialised (decl, name, size, rounded))
1822 /* Handle initialized definitions.
1823 Also handle uninitialized global definitions if -fno-common and the
1824 target doesn't support ASM_OUTPUT_BSS. */
1826 /* First make the assembler name(s) global if appropriate. */
1827 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
1828 globalize_decl (decl);
1830 /* Output any data that we will need to use the address of. */
1831 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
1832 output_addressed_constants (DECL_INITIAL (decl));
1834 /* dbxout.c needs to know this. */
1835 if (in_section && (in_section->common.flags & SECTION_CODE) != 0)
1836 DECL_IN_TEXT_SECTION (decl) = 1;
1838 /* If the decl is part of an object_block, make sure that the decl
1839 has been positioned within its block, but do not write out its
1840 definition yet. output_object_blocks will do that later. */
1843 gcc_assert (!dont_output_data);
1844 place_block_symbol (XEXP (decl_rtl, 0));
1848 switch_to_section (get_variable_section (decl));
1849 if (align > BITS_PER_UNIT)
1850 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (DECL_ALIGN_UNIT (decl)));
1851 assemble_variable_contents (decl, name, dont_output_data);
1855 /* Return 1 if type TYPE contains any pointers. */
1858 contains_pointers_p (tree type)
1860 switch (TREE_CODE (type))
1863 case REFERENCE_TYPE:
1864 /* I'm not sure whether OFFSET_TYPE needs this treatment,
1865 so I'll play safe and return 1. */
1871 case QUAL_UNION_TYPE:
1874 /* For a type that has fields, see if the fields have pointers. */
1875 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
1876 if (TREE_CODE (fields) == FIELD_DECL
1877 && contains_pointers_p (TREE_TYPE (fields)))
1883 /* An array type contains pointers if its element type does. */
1884 return contains_pointers_p (TREE_TYPE (type));
1891 /* In unit-at-a-time mode, we delay assemble_external processing until
1892 the compilation unit is finalized. This is the best we can do for
1893 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
1894 it all the way to final. See PR 17982 for further discussion. */
1895 static GTY(()) tree pending_assemble_externals;
1897 #ifdef ASM_OUTPUT_EXTERNAL
1898 /* True if DECL is a function decl for which no out-of-line copy exists.
1899 It is assumed that DECL's assembler name has been set. */
1902 incorporeal_function_p (tree decl)
1904 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1908 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
1909 && DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA)
1912 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1913 if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0)
1919 /* Actually do the tests to determine if this is necessary, and invoke
1920 ASM_OUTPUT_EXTERNAL. */
1922 assemble_external_real (tree decl)
1924 rtx rtl = DECL_RTL (decl);
1926 if (MEM_P (rtl) && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
1927 && !SYMBOL_REF_USED (XEXP (rtl, 0))
1928 && !incorporeal_function_p (decl))
1930 /* Some systems do require some output. */
1931 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
1932 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
1938 process_pending_assemble_externals (void)
1940 #ifdef ASM_OUTPUT_EXTERNAL
1942 for (list = pending_assemble_externals; list; list = TREE_CHAIN (list))
1943 assemble_external_real (TREE_VALUE (list));
1945 pending_assemble_externals = 0;
1949 /* Output something to declare an external symbol to the assembler.
1950 (Most assemblers don't need this, so we normally output nothing.)
1951 Do nothing if DECL is not external. */
1954 assemble_external (tree decl ATTRIBUTE_UNUSED)
1956 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
1957 main body of this code is only rarely exercised. To provide some
1958 testing, on all platforms, we make sure that the ASM_OUT_FILE is
1959 open. If it's not, we should not be calling this function. */
1960 gcc_assert (asm_out_file);
1962 #ifdef ASM_OUTPUT_EXTERNAL
1963 if (!DECL_P (decl) || !DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
1966 if (flag_unit_at_a_time)
1967 pending_assemble_externals = tree_cons (0, decl,
1968 pending_assemble_externals);
1970 assemble_external_real (decl);
1974 /* Similar, for calling a library function FUN. */
1977 assemble_external_libcall (rtx fun)
1979 /* Declare library function name external when first used, if nec. */
1980 if (! SYMBOL_REF_USED (fun))
1982 SYMBOL_REF_USED (fun) = 1;
1983 targetm.asm_out.external_libcall (fun);
1987 /* Assemble a label named NAME. */
1990 assemble_label (const char *name)
1992 ASM_OUTPUT_LABEL (asm_out_file, name);
1995 /* Set the symbol_referenced flag for ID. */
1997 mark_referenced (tree id)
1999 TREE_SYMBOL_REFERENCED (id) = 1;
2002 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2004 mark_decl_referenced (tree decl)
2006 if (TREE_CODE (decl) == FUNCTION_DECL)
2008 /* Extern inline functions don't become needed when referenced.
2009 If we know a method will be emitted in other TU and no new
2010 functions can be marked reachable, just use the external
2012 struct cgraph_node *node = cgraph_node (decl);
2013 if (!DECL_EXTERNAL (decl)
2014 && (!node->local.vtable_method || !cgraph_global_info_ready
2015 || !node->local.finalized))
2016 cgraph_mark_needed_node (node);
2018 else if (TREE_CODE (decl) == VAR_DECL)
2020 struct cgraph_varpool_node *node = cgraph_varpool_node (decl);
2021 cgraph_varpool_mark_needed_node (node);
2022 /* C++ frontend use mark_decl_references to force COMDAT variables
2023 to be output that might appear dead otherwise. */
2024 node->force_output = true;
2026 /* else do nothing - we can get various sorts of CST nodes here,
2027 which do not need to be marked. */
2031 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2032 until we find an identifier that is not itself a transparent alias.
2033 Modify the alias passed to it by reference (and all aliases on the
2034 way to the ultimate target), such that they do not have to be
2035 followed again, and return the ultimate target of the alias
2039 ultimate_transparent_alias_target (tree *alias)
2041 tree target = *alias;
2043 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
2045 gcc_assert (TREE_CHAIN (target));
2046 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
2047 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
2048 && ! TREE_CHAIN (target));
2055 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2056 starts with a *, the rest of NAME is output verbatim. Otherwise
2057 NAME is transformed in a target-specific way (usually by the
2058 addition of an underscore). */
2061 assemble_name_raw (FILE *file, const char *name)
2064 fputs (&name[1], file);
2066 ASM_OUTPUT_LABELREF (file, name);
2069 /* Like assemble_name_raw, but should be used when NAME might refer to
2070 an entity that is also represented as a tree (like a function or
2071 variable). If NAME does refer to such an entity, that entity will
2072 be marked as referenced. */
2075 assemble_name (FILE *file, const char *name)
2077 const char *real_name;
2080 real_name = targetm.strip_name_encoding (name);
2082 id = maybe_get_identifier (real_name);
2087 mark_referenced (id);
2088 ultimate_transparent_alias_target (&id);
2090 name = IDENTIFIER_POINTER (id);
2091 gcc_assert (! TREE_CHAIN (id));
2094 assemble_name_raw (file, name);
2097 /* Allocate SIZE bytes writable static space with a gensym name
2098 and return an RTX to refer to its address. */
2101 assemble_static_space (unsigned HOST_WIDE_INT size)
2104 const char *namestring;
2108 if (flag_shared_data)
2109 switch_to_section (data_section);
2112 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2114 namestring = ggc_strdup (name);
2116 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2117 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2119 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2120 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2123 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2124 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2127 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2128 so that each uninitialized object starts on such a boundary. */
2129 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2130 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2131 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2132 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2133 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2134 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2141 /* Assemble the static constant template for function entry trampolines.
2142 This is done at most once per compilation.
2143 Returns an RTX for the address of the template. */
2145 static GTY(()) rtx initial_trampoline;
2147 #ifdef TRAMPOLINE_TEMPLATE
2149 assemble_trampoline_template (void)
2156 if (initial_trampoline)
2157 return initial_trampoline;
2159 /* By default, put trampoline templates in read-only data section. */
2161 #ifdef TRAMPOLINE_SECTION
2162 switch_to_section (TRAMPOLINE_SECTION);
2164 switch_to_section (readonly_data_section);
2167 /* Write the assembler code to define one. */
2168 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2171 ASM_OUTPUT_ALIGN (asm_out_file, align);
2174 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2175 TRAMPOLINE_TEMPLATE (asm_out_file);
2177 /* Record the rtl to refer to it. */
2178 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2179 name = ggc_strdup (label);
2180 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2181 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2183 initial_trampoline = gen_rtx_MEM (BLKmode, symbol);
2184 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2186 return initial_trampoline;
2190 /* A and B are either alignments or offsets. Return the minimum alignment
2191 that may be assumed after adding the two together. */
2193 static inline unsigned
2194 min_align (unsigned int a, unsigned int b)
2196 return (a | b) & -(a | b);
2199 /* Return the assembler directive for creating a given kind of integer
2200 object. SIZE is the number of bytes in the object and ALIGNED_P
2201 indicates whether it is known to be aligned. Return NULL if the
2202 assembly dialect has no such directive.
2204 The returned string should be printed at the start of a new line and
2205 be followed immediately by the object's initial value. */
2208 integer_asm_op (int size, int aligned_p)
2210 struct asm_int_op *ops;
2213 ops = &targetm.asm_out.aligned_op;
2215 ops = &targetm.asm_out.unaligned_op;
2220 return targetm.asm_out.byte_op;
2234 /* Use directive OP to assemble an integer object X. Print OP at the
2235 start of the line, followed immediately by the value of X. */
2238 assemble_integer_with_op (const char *op, rtx x)
2240 fputs (op, asm_out_file);
2241 output_addr_const (asm_out_file, x);
2242 fputc ('\n', asm_out_file);
2245 /* The default implementation of the asm_out.integer target hook. */
2248 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2249 unsigned int size ATTRIBUTE_UNUSED,
2250 int aligned_p ATTRIBUTE_UNUSED)
2252 const char *op = integer_asm_op (size, aligned_p);
2253 /* Avoid GAS bugs for large values. Specifically negative values whose
2254 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2255 if (size > UNITS_PER_WORD && size > POINTER_SIZE / BITS_PER_UNIT)
2257 return op && (assemble_integer_with_op (op, x), true);
2260 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2261 the alignment of the integer in bits. Return 1 if we were able to output
2262 the constant, otherwise 0. We must be able to output the constant,
2263 if FORCE is nonzero. */
2266 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2270 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2272 /* See if the target hook can handle this kind of object. */
2273 if (targetm.asm_out.integer (x, size, aligned_p))
2276 /* If the object is a multi-byte one, try splitting it up. Split
2277 it into words it if is multi-word, otherwise split it into bytes. */
2280 enum machine_mode omode, imode;
2281 unsigned int subalign;
2282 unsigned int subsize, i;
2284 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2285 subalign = MIN (align, subsize * BITS_PER_UNIT);
2286 omode = mode_for_size (subsize * BITS_PER_UNIT, MODE_INT, 0);
2287 imode = mode_for_size (size * BITS_PER_UNIT, MODE_INT, 0);
2289 for (i = 0; i < size; i += subsize)
2291 rtx partial = simplify_subreg (omode, x, imode, i);
2292 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2298 /* If we've printed some of it, but not all of it, there's no going
2303 gcc_assert (!force);
2309 assemble_real (REAL_VALUE_TYPE d, enum machine_mode mode, unsigned int align)
2311 long data[4] = {0, 0, 0, 0};
2313 int bitsize, nelts, nunits, units_per;
2315 /* This is hairy. We have a quantity of known size. real_to_target
2316 will put it into an array of *host* longs, 32 bits per element
2317 (even if long is more than 32 bits). We need to determine the
2318 number of array elements that are occupied (nelts) and the number
2319 of *target* min-addressable units that will be occupied in the
2320 object file (nunits). We cannot assume that 32 divides the
2321 mode's bitsize (size * BITS_PER_UNIT) evenly.
2323 size * BITS_PER_UNIT is used here to make sure that padding bits
2324 (which might appear at either end of the value; real_to_target
2325 will include the padding bits in its output array) are included. */
2327 nunits = GET_MODE_SIZE (mode);
2328 bitsize = nunits * BITS_PER_UNIT;
2329 nelts = CEIL (bitsize, 32);
2330 units_per = 32 / BITS_PER_UNIT;
2332 real_to_target (data, &d, mode);
2334 /* Put out the first word with the specified alignment. */
2335 assemble_integer (GEN_INT (data[0]), MIN (nunits, units_per), align, 1);
2336 nunits -= units_per;
2338 /* Subsequent words need only 32-bit alignment. */
2339 align = min_align (align, 32);
2341 for (i = 1; i < nelts; i++)
2343 assemble_integer (GEN_INT (data[i]), MIN (nunits, units_per), align, 1);
2344 nunits -= units_per;
2348 /* Given an expression EXP with a constant value,
2349 reduce it to the sum of an assembler symbol and an integer.
2350 Store them both in the structure *VALUE.
2351 EXP must be reducible. */
2353 struct addr_const GTY(())
2356 HOST_WIDE_INT offset;
2360 decode_addr_const (tree exp, struct addr_const *value)
2362 tree target = TREE_OPERAND (exp, 0);
2368 if (TREE_CODE (target) == COMPONENT_REF
2369 && host_integerp (byte_position (TREE_OPERAND (target, 1)), 0))
2372 offset += int_byte_position (TREE_OPERAND (target, 1));
2373 target = TREE_OPERAND (target, 0);
2375 else if (TREE_CODE (target) == ARRAY_REF
2376 || TREE_CODE (target) == ARRAY_RANGE_REF)
2378 offset += (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target)), 1)
2379 * tree_low_cst (TREE_OPERAND (target, 1), 0));
2380 target = TREE_OPERAND (target, 0);
2386 switch (TREE_CODE (target))
2390 x = DECL_RTL (target);
2394 x = gen_rtx_MEM (FUNCTION_MODE,
2395 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2403 x = output_constant_def (target, 1);
2410 gcc_assert (MEM_P (x));
2414 value->offset = offset;
2417 /* Uniquize all constants that appear in memory.
2418 Each constant in memory thus far output is recorded
2419 in `const_desc_table'. */
2421 struct constant_descriptor_tree GTY(())
2423 /* A MEM for the constant. */
2426 /* The value of the constant. */
2429 /* Hash of value. Computing the hash from value each time
2430 hashfn is called can't work properly, as that means recursive
2431 use of the hash table during hash table expansion. */
2435 static GTY((param_is (struct constant_descriptor_tree)))
2436 htab_t const_desc_htab;
2438 static struct constant_descriptor_tree * build_constant_desc (tree);
2439 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2441 /* Compute a hash code for a constant expression. */
2444 const_desc_hash (const void *ptr)
2446 return ((struct constant_descriptor_tree *)ptr)->hash;
2450 const_hash_1 (const tree exp)
2455 enum tree_code code = TREE_CODE (exp);
2457 /* Either set P and LEN to the address and len of something to hash and
2458 exit the switch or return a value. */
2463 p = (char *) &TREE_INT_CST (exp);
2464 len = sizeof TREE_INT_CST (exp);
2468 return real_hash (TREE_REAL_CST_PTR (exp));
2471 p = TREE_STRING_POINTER (exp);
2472 len = TREE_STRING_LENGTH (exp);
2476 return (const_hash_1 (TREE_REALPART (exp)) * 5
2477 + const_hash_1 (TREE_IMAGPART (exp)));
2481 unsigned HOST_WIDE_INT idx;
2484 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2486 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
2488 hi = hi * 603 + const_hash_1 (value);
2496 struct addr_const value;
2498 decode_addr_const (exp, &value);
2499 switch (GET_CODE (value.base))
2502 /* Don't hash the address of the SYMBOL_REF;
2503 only use the offset and the symbol name. */
2505 p = XSTR (value.base, 0);
2506 for (i = 0; p[i] != 0; i++)
2507 hi = ((hi * 613) + (unsigned) (p[i]));
2511 hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
2522 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2523 + const_hash_1 (TREE_OPERAND (exp, 1)));
2527 case NON_LVALUE_EXPR:
2528 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2531 /* A language specific constant. Just hash the code. */
2535 /* Compute hashing function. */
2537 for (i = 0; i < len; i++)
2538 hi = ((hi * 613) + (unsigned) (p[i]));
2543 /* Wrapper of compare_constant, for the htab interface. */
2545 const_desc_eq (const void *p1, const void *p2)
2547 const struct constant_descriptor_tree *c1 = p1;
2548 const struct constant_descriptor_tree *c2 = p2;
2549 if (c1->hash != c2->hash)
2551 return compare_constant (c1->value, c2->value);
2554 /* Compare t1 and t2, and return 1 only if they are known to result in
2555 the same bit pattern on output. */
2558 compare_constant (const tree t1, const tree t2)
2560 enum tree_code typecode;
2562 if (t1 == NULL_TREE)
2563 return t2 == NULL_TREE;
2564 if (t2 == NULL_TREE)
2567 if (TREE_CODE (t1) != TREE_CODE (t2))
2570 switch (TREE_CODE (t1))
2573 /* Integer constants are the same only if the same width of type. */
2574 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2576 return tree_int_cst_equal (t1, t2);
2579 /* Real constants are the same only if the same width of type. */
2580 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2583 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
2586 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2589 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
2590 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
2591 TREE_STRING_LENGTH (t1)));
2594 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
2595 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
2599 VEC(constructor_elt, gc) *v1, *v2;
2600 unsigned HOST_WIDE_INT idx;
2602 typecode = TREE_CODE (TREE_TYPE (t1));
2603 if (typecode != TREE_CODE (TREE_TYPE (t2)))
2606 if (typecode == ARRAY_TYPE)
2608 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
2609 /* For arrays, check that the sizes all match. */
2610 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
2612 || size_1 != int_size_in_bytes (TREE_TYPE (t2)))
2617 /* For record and union constructors, require exact type
2619 if (TREE_TYPE (t1) != TREE_TYPE (t2))
2623 v1 = CONSTRUCTOR_ELTS (t1);
2624 v2 = CONSTRUCTOR_ELTS (t2);
2625 if (VEC_length (constructor_elt, v1)
2626 != VEC_length (constructor_elt, v2))
2629 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
2631 constructor_elt *c1 = VEC_index (constructor_elt, v1, idx);
2632 constructor_elt *c2 = VEC_index (constructor_elt, v2, idx);
2634 /* Check that each value is the same... */
2635 if (!compare_constant (c1->value, c2->value))
2637 /* ... and that they apply to the same fields! */
2638 if (typecode == ARRAY_TYPE)
2640 if (!compare_constant (c1->index, c2->index))
2645 if (c1->index != c2->index)
2656 struct addr_const value1, value2;
2658 decode_addr_const (t1, &value1);
2659 decode_addr_const (t2, &value2);
2660 return (value1.offset == value2.offset
2661 && strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
2667 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
2668 && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
2672 case NON_LVALUE_EXPR:
2673 case VIEW_CONVERT_EXPR:
2674 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
2679 nt1 = lang_hooks.expand_constant (t1);
2680 nt2 = lang_hooks.expand_constant (t2);
2681 if (nt1 != t1 || nt2 != t2)
2682 return compare_constant (nt1, nt2);
2691 /* Make a copy of the whole tree structure for a constant. This
2692 handles the same types of nodes that compare_constant handles. */
2695 copy_constant (tree exp)
2697 switch (TREE_CODE (exp))
2700 /* For ADDR_EXPR, we do not want to copy the decl whose address
2701 is requested. We do want to copy constants though. */
2702 if (CONSTANT_CLASS_P (TREE_OPERAND (exp, 0)))
2703 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2704 copy_constant (TREE_OPERAND (exp, 0)));
2706 return copy_node (exp);
2711 return copy_node (exp);
2714 return build_complex (TREE_TYPE (exp),
2715 copy_constant (TREE_REALPART (exp)),
2716 copy_constant (TREE_IMAGPART (exp)));
2720 return build2 (TREE_CODE (exp), TREE_TYPE (exp),
2721 copy_constant (TREE_OPERAND (exp, 0)),
2722 copy_constant (TREE_OPERAND (exp, 1)));
2726 case NON_LVALUE_EXPR:
2727 case VIEW_CONVERT_EXPR:
2728 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2729 copy_constant (TREE_OPERAND (exp, 0)));
2733 tree copy = copy_node (exp);
2734 VEC(constructor_elt, gc) *v;
2735 unsigned HOST_WIDE_INT idx;
2736 tree purpose, value;
2738 v = VEC_alloc(constructor_elt, gc, VEC_length(constructor_elt,
2739 CONSTRUCTOR_ELTS (exp)));
2740 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, purpose, value)
2742 constructor_elt *ce = VEC_quick_push (constructor_elt, v, NULL);
2743 ce->index = purpose;
2744 ce->value = copy_constant (value);
2746 CONSTRUCTOR_ELTS (copy) = v;
2752 tree t = lang_hooks.expand_constant (exp);
2754 gcc_assert (t == exp);
2755 return copy_constant (t);
2760 /* Return the alignment of constant EXP in bits. */
2763 get_constant_alignment (tree exp)
2767 align = TYPE_ALIGN (TREE_TYPE (exp));
2768 #ifdef CONSTANT_ALIGNMENT
2769 align = CONSTANT_ALIGNMENT (exp, align);
2774 /* Return the section into which constant EXP should be placed. */
2777 get_constant_section (tree exp)
2779 if (IN_NAMED_SECTION (exp))
2780 return get_named_section (exp, NULL, compute_reloc_for_constant (exp));
2782 return targetm.asm_out.select_section (exp,
2783 compute_reloc_for_constant (exp),
2784 get_constant_alignment (exp));
2787 /* Return the size of constant EXP in bytes. */
2789 static HOST_WIDE_INT
2790 get_constant_size (tree exp)
2794 size = int_size_in_bytes (TREE_TYPE (exp));
2795 if (TREE_CODE (exp) == STRING_CST)
2796 size = MAX (TREE_STRING_LENGTH (exp), size);
2800 /* Subroutine of output_constant_def:
2801 No constant equal to EXP is known to have been output.
2802 Make a constant descriptor to enter EXP in the hash table.
2803 Assign the label number and construct RTL to refer to the
2804 constant's location in memory.
2805 Caller is responsible for updating the hash table. */
2807 static struct constant_descriptor_tree *
2808 build_constant_desc (tree exp)
2814 struct constant_descriptor_tree *desc;
2816 desc = ggc_alloc (sizeof (*desc));
2817 desc->value = copy_constant (exp);
2819 /* Propagate marked-ness to copied constant. */
2820 if (flag_mudflap && mf_marked_p (exp))
2821 mf_mark (desc->value);
2823 /* Create a string containing the label name, in LABEL. */
2824 labelno = const_labelno++;
2825 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
2827 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
2828 if (use_object_blocks_p ())
2830 section *sect = get_constant_section (exp);
2831 symbol = create_block_symbol (ggc_strdup (label),
2832 get_block_for_section (sect), -1);
2835 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
2836 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
2837 SET_SYMBOL_REF_DECL (symbol, desc->value);
2838 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
2840 rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), symbol);
2841 set_mem_attributes (rtl, exp, 1);
2842 set_mem_alias_set (rtl, 0);
2843 set_mem_alias_set (rtl, const_alias_set);
2845 /* Set flags or add text to the name to record information, such as
2846 that it is a local symbol. If the name is changed, the macro
2847 ASM_OUTPUT_LABELREF will have to know how to strip this
2848 information. This call might invalidate our local variable
2849 SYMBOL; we can't use it afterward. */
2851 targetm.encode_section_info (exp, rtl, true);
2858 /* Return an rtx representing a reference to constant data in memory
2859 for the constant expression EXP.
2861 If assembler code for such a constant has already been output,
2862 return an rtx to refer to it.
2863 Otherwise, output such a constant in memory
2864 and generate an rtx for it.
2866 If DEFER is nonzero, this constant can be deferred and output only
2867 if referenced in the function after all optimizations.
2869 `const_desc_table' records which constants already have label strings. */
2872 output_constant_def (tree exp, int defer)
2874 struct constant_descriptor_tree *desc;
2875 struct constant_descriptor_tree key;
2878 /* Look up EXP in the table of constant descriptors. If we didn't find
2879 it, create a new one. */
2881 key.hash = const_hash_1 (exp);
2882 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
2887 desc = build_constant_desc (exp);
2888 desc->hash = key.hash;
2892 maybe_output_constant_def_contents (desc, defer);
2896 /* Subroutine of output_constant_def: Decide whether or not we need to
2897 output the constant DESC now, and if so, do it. */
2899 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
2902 rtx symbol = XEXP (desc->rtl, 0);
2903 tree exp = desc->value;
2905 if (flag_syntax_only)
2908 if (TREE_ASM_WRITTEN (exp))
2909 /* Already output; don't do it again. */
2912 /* We can always defer constants as long as the context allows
2916 /* Increment n_deferred_constants if it exists. It needs to be at
2917 least as large as the number of constants actually referred to
2918 by the function. If it's too small we'll stop looking too early
2919 and fail to emit constants; if it's too large we'll only look
2920 through the entire function when we could have stopped earlier. */
2922 n_deferred_constants++;
2926 output_constant_def_contents (symbol);
2929 /* Subroutine of output_constant_def_contents. Output the definition
2930 of constant EXP, which is pointed to by label LABEL. ALIGN is the
2931 constant's alignment in bits. */
2934 assemble_constant_contents (tree exp, const char *label, unsigned int align)
2938 size = get_constant_size (exp);
2940 /* Do any machine/system dependent processing of the constant. */
2941 #ifdef ASM_DECLARE_CONSTANT_NAME
2942 ASM_DECLARE_CONSTANT_NAME (asm_out_file, label, exp, size);
2944 /* Standard thing is just output label for the constant. */
2945 ASM_OUTPUT_LABEL (asm_out_file, label);
2946 #endif /* ASM_DECLARE_CONSTANT_NAME */
2948 /* Output the value of EXP. */
2949 output_constant (exp, size, align);
2952 /* We must output the constant data referred to by SYMBOL; do so. */
2955 output_constant_def_contents (rtx symbol)
2957 tree exp = SYMBOL_REF_DECL (symbol);
2960 /* Make sure any other constants whose addresses appear in EXP
2961 are assigned label numbers. */
2962 output_addressed_constants (exp);
2964 /* We are no longer deferring this constant. */
2965 TREE_ASM_WRITTEN (exp) = 1;
2967 /* If the constant is part of an object block, make sure that the
2968 decl has been positioned within its block, but do not write out
2969 its definition yet. output_object_blocks will do that later. */
2970 if (SYMBOL_REF_IN_BLOCK_P (symbol))
2971 place_block_symbol (symbol);
2974 switch_to_section (get_constant_section (exp));
2975 align = get_constant_alignment (exp);
2976 if (align > BITS_PER_UNIT)
2977 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
2978 assemble_constant_contents (exp, XSTR (symbol, 0), align);
2981 mudflap_enqueue_constant (exp);
2984 /* Look up EXP in the table of constant descriptors. Return the rtl
2985 if it has been emitted, else null. */
2988 lookup_constant_def (tree exp)
2990 struct constant_descriptor_tree *desc;
2991 struct constant_descriptor_tree key;
2994 key.hash = const_hash_1 (exp);
2995 desc = htab_find_with_hash (const_desc_htab, &key, key.hash);
2997 return (desc ? desc->rtl : NULL_RTX);
3000 /* Used in the hash tables to avoid outputting the same constant
3001 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3002 are output once per function, not once per file. */
3003 /* ??? Only a few targets need per-function constant pools. Most
3004 can use one per-file pool. Should add a targetm bit to tell the
3007 struct rtx_constant_pool GTY(())
3009 /* Pointers to first and last constant in pool, as ordered by offset. */
3010 struct constant_descriptor_rtx *first;
3011 struct constant_descriptor_rtx *last;
3013 /* Hash facility for making memory-constants from constant rtl-expressions.
3014 It is used on RISC machines where immediate integer arguments and
3015 constant addresses are restricted so that such constants must be stored
3017 htab_t GTY((param_is (struct constant_descriptor_rtx))) const_rtx_htab;
3019 /* Current offset in constant pool (does not include any
3020 machine-specific header). */
3021 HOST_WIDE_INT offset;
3024 struct constant_descriptor_rtx GTY((chain_next ("%h.next")))
3026 struct constant_descriptor_rtx *next;
3030 HOST_WIDE_INT offset;
3032 enum machine_mode mode;
3038 /* Hash and compare functions for const_rtx_htab. */
3041 const_desc_rtx_hash (const void *ptr)
3043 const struct constant_descriptor_rtx *desc = ptr;
3048 const_desc_rtx_eq (const void *a, const void *b)
3050 const struct constant_descriptor_rtx *x = a;
3051 const struct constant_descriptor_rtx *y = b;
3053 if (x->mode != y->mode)
3055 return rtx_equal_p (x->constant, y->constant);
3058 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3061 const_rtx_hash_1 (rtx *xp, void *data)
3063 unsigned HOST_WIDE_INT hwi;
3064 enum machine_mode mode;
3070 code = GET_CODE (x);
3071 mode = GET_MODE (x);
3072 h = (hashval_t) code * 1048573 + mode;
3080 const int shift = sizeof (hashval_t) * CHAR_BIT;
3081 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3084 h ^= (hashval_t) hwi;
3085 for (i = 1; i < n; ++i)
3088 h ^= (hashval_t) hwi;
3094 if (mode == VOIDmode)
3096 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3100 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3106 for (i = XVECLEN (x, 0); i-- > 0; )
3107 h = h * 251 + const_rtx_hash_1 (&XVECEXP (x, 0, i), data);
3112 h ^= htab_hash_string (XSTR (x, 0));
3116 h = h * 251 + CODE_LABEL_NUMBER (XEXP (x, 0));
3120 case UNSPEC_VOLATILE:
3121 h = h * 251 + XINT (x, 1);
3129 *hp = *hp * 509 + h;
3133 /* Compute a hash value for X, which should be a constant. */
3136 const_rtx_hash (rtx x)
3139 for_each_rtx (&x, const_rtx_hash_1, &h);
3144 /* Initialize constant pool hashing for a new function. */
3147 init_varasm_status (struct function *f)
3149 struct varasm_status *p;
3150 struct rtx_constant_pool *pool;
3152 p = ggc_alloc (sizeof (struct varasm_status));
3155 pool = ggc_alloc (sizeof (struct rtx_constant_pool));
3157 p->deferred_constants = 0;
3159 pool->const_rtx_htab = htab_create_ggc (31, const_desc_rtx_hash,
3160 const_desc_rtx_eq, NULL);
3161 pool->first = pool->last = NULL;
3165 /* Given a MINUS expression, simplify it if both sides
3166 include the same symbol. */
3169 simplify_subtraction (rtx x)
3171 rtx r = simplify_rtx (x);
3175 /* Given a constant rtx X, make (or find) a memory constant for its value
3176 and return a MEM rtx to refer to it in memory. */
3179 force_const_mem (enum machine_mode mode, rtx x)
3181 struct constant_descriptor_rtx *desc, tmp;
3182 struct rtx_constant_pool *pool = cfun->varasm->pool;
3189 /* If we're not allowed to drop X into the constant pool, don't. */
3190 if (targetm.cannot_force_const_mem (x))
3193 /* Lookup the value in the hashtable. */
3196 hash = const_rtx_hash (x);
3197 slot = htab_find_slot_with_hash (pool->const_rtx_htab, &tmp, hash, INSERT);
3200 /* If the constant was already present, return its memory. */
3202 return copy_rtx (desc->mem);
3204 /* Otherwise, create a new descriptor. */
3205 desc = ggc_alloc (sizeof (*desc));
3208 /* Align the location counter as required by EXP's data type. */
3209 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3210 #ifdef CONSTANT_ALIGNMENT
3212 tree type = lang_hooks.types.type_for_mode (mode, 0);
3213 if (type != NULL_TREE)
3214 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3218 pool->offset += (align / BITS_PER_UNIT) - 1;
3219 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3222 desc->constant = tmp.constant;
3223 desc->offset = pool->offset;
3226 desc->align = align;
3227 desc->labelno = const_labelno;
3230 pool->offset += GET_MODE_SIZE (mode);
3232 pool->last->next = desc;
3234 pool->first = pool->last = desc;
3237 /* Create a string containing the label name, in LABEL. */
3238 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3241 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3242 the constants pool. */
3243 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3245 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3246 symbol = create_block_symbol (ggc_strdup (label),
3247 get_block_for_section (sect), -1);
3250 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3252 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3253 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3254 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3255 current_function_uses_const_pool = 1;
3257 /* Construct the MEM. */
3258 desc->mem = def = gen_const_mem (mode, symbol);
3259 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3260 set_mem_align (def, align);
3262 /* If we're dropping a label to the constant pool, make sure we
3264 if (GET_CODE (x) == LABEL_REF)
3265 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3267 return copy_rtx (def);
3270 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3273 get_pool_constant (rtx addr)
3275 return SYMBOL_REF_CONSTANT (addr)->constant;
3278 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3279 and whether it has been output or not. */
3282 get_pool_constant_mark (rtx addr, bool *pmarked)
3284 struct constant_descriptor_rtx *desc;
3286 desc = SYMBOL_REF_CONSTANT (addr);
3287 *pmarked = (desc->mark != 0);
3288 return desc->constant;
3291 /* Similar, return the mode. */
3294 get_pool_mode (rtx addr)
3296 return SYMBOL_REF_CONSTANT (addr)->mode;
3299 /* Return the size of the constant pool. */
3302 get_pool_size (void)
3304 return cfun->varasm->pool->offset;
3307 /* Worker function for output_constant_pool_1. Emit assembly for X
3308 in MODE with known alignment ALIGN. */
3311 output_constant_pool_2 (enum machine_mode mode, rtx x, unsigned int align)
3313 switch (GET_MODE_CLASS (mode))
3316 case MODE_DECIMAL_FLOAT:
3320 gcc_assert (GET_CODE (x) == CONST_DOUBLE);
3321 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
3322 assemble_real (r, mode, align);
3327 case MODE_PARTIAL_INT:
3328 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3331 case MODE_VECTOR_FLOAT:
3332 case MODE_VECTOR_INT:
3335 enum machine_mode submode = GET_MODE_INNER (mode);
3336 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3338 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3339 units = CONST_VECTOR_NUNITS (x);
3341 for (i = 0; i < units; i++)
3343 rtx elt = CONST_VECTOR_ELT (x, i);
3344 output_constant_pool_2 (submode, elt, i ? subalign : align);
3354 /* Worker function for output_constant_pool. Emit constant DESC,
3355 giving it ALIGN bits of alignment. */
3358 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3365 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3366 whose CODE_LABEL has been deleted. This can occur if a jump table
3367 is eliminated by optimization. If so, write a constant of zero
3368 instead. Note that this can also happen by turning the
3369 CODE_LABEL into a NOTE. */
3370 /* ??? This seems completely and utterly wrong. Certainly it's
3371 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3372 functioning even with INSN_DELETED_P and friends. */
3375 switch (GET_CODE (x))
3378 if (GET_CODE (XEXP (x, 0)) != PLUS
3379 || GET_CODE (XEXP (XEXP (x, 0), 0)) != LABEL_REF)
3381 tmp = XEXP (XEXP (x, 0), 0);
3386 gcc_assert (!INSN_DELETED_P (tmp));
3387 gcc_assert (!NOTE_P (tmp)
3388 || NOTE_LINE_NUMBER (tmp) != NOTE_INSN_DELETED);
3395 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3396 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3397 align, desc->labelno, done);
3400 assemble_align (align);
3402 /* Output the label. */
3403 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3405 /* Output the data. */
3406 output_constant_pool_2 (desc->mode, x, align);
3408 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3409 sections have proper size. */
3410 if (align > GET_MODE_BITSIZE (desc->mode)
3412 && (in_section->common.flags & SECTION_MERGE))
3413 assemble_align (align);
3415 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3421 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3422 to as used. Emit referenced deferred strings. This function can
3423 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3426 mark_constant (rtx *current_rtx, void *data)
3428 struct rtx_constant_pool *pool = data;
3429 rtx x = *current_rtx;
3431 if (x == NULL_RTX || GET_CODE (x) != SYMBOL_REF)
3434 if (CONSTANT_POOL_ADDRESS_P (x))
3436 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3437 if (desc->mark == 0)
3440 for_each_rtx (&desc->constant, mark_constant, pool);
3443 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3445 tree exp = SYMBOL_REF_DECL (x);
3446 if (!TREE_ASM_WRITTEN (exp))
3448 n_deferred_constants--;
3449 output_constant_def_contents (x);
3456 /* Look through appropriate parts of INSN, marking all entries in the
3457 constant pool which are actually being used. Entries that are only
3458 referenced by other constants are also marked as used. Emit
3459 deferred strings that are used. */
3462 mark_constants (struct rtx_constant_pool *pool, rtx insn)
3467 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3468 insns, not any notes that may be attached. We don't want to mark
3469 a constant just because it happens to appear in a REG_EQUIV note. */
3470 if (GET_CODE (PATTERN (insn)) == SEQUENCE)
3472 rtx seq = PATTERN (insn);
3473 int i, n = XVECLEN (seq, 0);
3474 for (i = 0; i < n; ++i)
3476 rtx subinsn = XVECEXP (seq, 0, i);
3477 if (INSN_P (subinsn))
3478 for_each_rtx (&PATTERN (subinsn), mark_constant, pool);
3482 for_each_rtx (&PATTERN (insn), mark_constant, pool);
3485 /* Look through the instructions for this function, and mark all the
3486 entries in POOL which are actually being used. Emit deferred constants
3487 which have indeed been used. */
3490 mark_constant_pool (struct rtx_constant_pool *pool)
3494 if (pool->first == 0 && n_deferred_constants == 0)
3497 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3498 mark_constants (pool, insn);
3500 for (link = current_function_epilogue_delay_list;
3502 link = XEXP (link, 1))
3503 mark_constants (pool, XEXP (link, 0));
3506 /* Write all the constants in the constant pool. */
3509 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
3510 tree fndecl ATTRIBUTE_UNUSED)
3512 struct rtx_constant_pool *pool = cfun->varasm->pool;
3513 struct constant_descriptor_rtx *desc;
3515 /* It is possible for gcc to call force_const_mem and then to later
3516 discard the instructions which refer to the constant. In such a
3517 case we do not need to output the constant. */
3518 mark_constant_pool (pool);
3520 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3521 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
3524 for (desc = pool->first; desc ; desc = desc->next)
3527 /* If the constant is part of an object_block, make sure that
3528 the constant has been positioned within its block, but do not
3529 write out its definition yet. output_object_blocks will do
3531 if (SYMBOL_REF_IN_BLOCK_P (desc->sym))
3532 place_block_symbol (desc->sym);
3535 switch_to_section (targetm.asm_out.select_rtx_section
3536 (desc->mode, desc->constant, desc->align));
3537 output_constant_pool_1 (desc, desc->align);
3541 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3542 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
3546 /* Determine what kind of relocations EXP may need. */
3549 compute_reloc_for_constant (tree exp)
3551 int reloc = 0, reloc2;
3554 /* Give the front-end a chance to convert VALUE to something that
3555 looks more like a constant to the back-end. */
3556 exp = lang_hooks.expand_constant (exp);
3558 switch (TREE_CODE (exp))
3562 /* Go inside any operations that get_inner_reference can handle and see
3563 if what's inside is a constant: no need to do anything here for
3564 addresses of variables or functions. */
3565 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3566 tem = TREE_OPERAND (tem, 0))
3569 if (TREE_PUBLIC (tem))
3576 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3577 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3581 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3582 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3583 /* The difference of two local labels is computable at link time. */
3584 if (reloc == 1 && reloc2 == 1)
3592 case NON_LVALUE_EXPR:
3593 case VIEW_CONVERT_EXPR:
3594 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3599 unsigned HOST_WIDE_INT idx;
3600 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3602 reloc |= compute_reloc_for_constant (tem);
3612 /* Find all the constants whose addresses are referenced inside of EXP,
3613 and make sure assembler code with a label has been output for each one.
3614 Indicate whether an ADDR_EXPR has been encountered. */
3617 output_addressed_constants (tree exp)
3621 /* Give the front-end a chance to convert VALUE to something that
3622 looks more like a constant to the back-end. */
3623 exp = lang_hooks.expand_constant (exp);
3625 switch (TREE_CODE (exp))
3629 /* Go inside any operations that get_inner_reference can handle and see
3630 if what's inside is a constant: no need to do anything here for
3631 addresses of variables or functions. */
3632 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3633 tem = TREE_OPERAND (tem, 0))
3636 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3637 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
3638 tem = DECL_INITIAL (tem);
3640 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
3641 output_constant_def (tem, 0);
3646 output_addressed_constants (TREE_OPERAND (exp, 1));
3651 case NON_LVALUE_EXPR:
3652 case VIEW_CONVERT_EXPR:
3653 output_addressed_constants (TREE_OPERAND (exp, 0));
3658 unsigned HOST_WIDE_INT idx;
3659 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3661 output_addressed_constants (tem);
3670 /* Return nonzero if VALUE is a valid constant-valued expression
3671 for use in initializing a static variable; one that can be an
3672 element of a "constant" initializer.
3674 Return null_pointer_node if the value is absolute;
3675 if it is relocatable, return the variable that determines the relocation.
3676 We assume that VALUE has been folded as much as possible;
3677 therefore, we do not need to check for such things as
3678 arithmetic-combinations of integers. */
3681 initializer_constant_valid_p (tree value, tree endtype)
3683 /* Give the front-end a chance to convert VALUE to something that
3684 looks more like a constant to the back-end. */
3685 value = lang_hooks.expand_constant (value);
3687 switch (TREE_CODE (value))
3690 if ((TREE_CODE (TREE_TYPE (value)) == UNION_TYPE
3691 || TREE_CODE (TREE_TYPE (value)) == RECORD_TYPE)
3692 && TREE_CONSTANT (value)
3693 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (value)))
3695 unsigned HOST_WIDE_INT idx;
3697 bool absolute = true;
3699 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
3702 reloc = initializer_constant_valid_p (elt, TREE_TYPE (elt));
3705 if (reloc != null_pointer_node)
3708 /* For a non-absolute relocation, there is no single
3709 variable that can be "the variable that determines the
3711 return absolute ? null_pointer_node : error_mark_node;
3714 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
3721 return null_pointer_node;
3725 value = staticp (TREE_OPERAND (value, 0));
3728 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out to
3729 be a constant, this is old-skool offsetof-like nonsense. */
3730 if (TREE_CODE (value) == INDIRECT_REF
3731 && TREE_CONSTANT (TREE_OPERAND (value, 0)))
3732 return null_pointer_node;
3733 /* Taking the address of a nested function involves a trampoline. */
3734 if (TREE_CODE (value) == FUNCTION_DECL
3735 && ((decl_function_context (value)
3736 && !DECL_NO_STATIC_CHAIN (value))
3737 || DECL_DLLIMPORT_P (value)))
3739 /* "&{...}" requires a temporary to hold the constructed
3741 if (TREE_CODE (value) == CONSTRUCTOR)
3746 case VIEW_CONVERT_EXPR:
3747 case NON_LVALUE_EXPR:
3748 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
3757 src = TREE_OPERAND (value, 0);
3758 src_type = TREE_TYPE (src);
3759 dest_type = TREE_TYPE (value);
3761 /* Allow conversions between pointer types, floating-point
3762 types, and offset types. */
3763 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
3764 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
3765 || (TREE_CODE (dest_type) == OFFSET_TYPE
3766 && TREE_CODE (src_type) == OFFSET_TYPE))
3767 return initializer_constant_valid_p (src, endtype);
3769 /* Allow length-preserving conversions between integer types. */
3770 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
3771 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
3772 return initializer_constant_valid_p (src, endtype);
3774 /* Allow conversions between other integer types only if
3776 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
3778 tree inner = initializer_constant_valid_p (src, endtype);
3779 if (inner == null_pointer_node)
3780 return null_pointer_node;
3784 /* Allow (int) &foo provided int is as wide as a pointer. */
3785 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
3786 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
3787 return initializer_constant_valid_p (src, endtype);
3789 /* Likewise conversions from int to pointers, but also allow
3790 conversions from 0. */
3791 if ((POINTER_TYPE_P (dest_type)
3792 || TREE_CODE (dest_type) == OFFSET_TYPE)
3793 && INTEGRAL_TYPE_P (src_type))
3795 if (TREE_CODE (src) == INTEGER_CST
3796 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
3797 return null_pointer_node;
3798 if (integer_zerop (src))
3799 return null_pointer_node;
3800 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
3801 return initializer_constant_valid_p (src, endtype);
3804 /* Allow conversions to struct or union types if the value
3806 if (TREE_CODE (dest_type) == RECORD_TYPE
3807 || TREE_CODE (dest_type) == UNION_TYPE)
3808 return initializer_constant_valid_p (src, endtype);
3813 if (! INTEGRAL_TYPE_P (endtype)
3814 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
3816 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
3818 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
3820 /* If either term is absolute, use the other terms relocation. */
3821 if (valid0 == null_pointer_node)
3823 if (valid1 == null_pointer_node)
3829 if (! INTEGRAL_TYPE_P (endtype)
3830 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
3832 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
3834 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
3836 /* Win if second argument is absolute. */
3837 if (valid1 == null_pointer_node)
3839 /* Win if both arguments have the same relocation.
3840 Then the value is absolute. */
3841 if (valid0 == valid1 && valid0 != 0)
3842 return null_pointer_node;
3844 /* Since GCC guarantees that string constants are unique in the
3845 generated code, a subtraction between two copies of the same
3846 constant string is absolute. */
3847 if (valid0 && TREE_CODE (valid0) == STRING_CST
3848 && valid1 && TREE_CODE (valid1) == STRING_CST
3849 && operand_equal_p (valid0, valid1, 1))
3850 return null_pointer_node;
3853 /* Support narrowing differences. */
3854 if (INTEGRAL_TYPE_P (endtype))
3858 op0 = TREE_OPERAND (value, 0);
3859 op1 = TREE_OPERAND (value, 1);
3861 /* Like STRIP_NOPS except allow the operand mode to widen.
3862 This works around a feature of fold that simplifies
3863 (int)(p1 - p2) to ((int)p1 - (int)p2) under the theory
3864 that the narrower operation is cheaper. */
3866 while (TREE_CODE (op0) == NOP_EXPR
3867 || TREE_CODE (op0) == CONVERT_EXPR
3868 || TREE_CODE (op0) == NON_LVALUE_EXPR)
3870 tree inner = TREE_OPERAND (op0, 0);
3871 if (inner == error_mark_node
3872 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
3873 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
3874 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
3879 while (TREE_CODE (op1) == NOP_EXPR
3880 || TREE_CODE (op1) == CONVERT_EXPR
3881 || TREE_CODE (op1) == NON_LVALUE_EXPR)
3883 tree inner = TREE_OPERAND (op1, 0);
3884 if (inner == error_mark_node
3885 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
3886 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
3887 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
3892 op0 = initializer_constant_valid_p (op0, endtype);
3893 op1 = initializer_constant_valid_p (op1, endtype);
3895 /* Both initializers must be known. */
3899 return null_pointer_node;
3901 /* Support differences between labels. */
3902 if (TREE_CODE (op0) == LABEL_DECL
3903 && TREE_CODE (op1) == LABEL_DECL)
3904 return null_pointer_node;
3906 if (TREE_CODE (op0) == STRING_CST
3907 && TREE_CODE (op1) == STRING_CST
3908 && operand_equal_p (op0, op1, 1))
3909 return null_pointer_node;
3921 /* Output assembler code for constant EXP to FILE, with no label.
3922 This includes the pseudo-op such as ".int" or ".byte", and a newline.
3923 Assumes output_addressed_constants has been done on EXP already.
3925 Generate exactly SIZE bytes of assembler data, padding at the end
3926 with zeros if necessary. SIZE must always be specified.
3928 SIZE is important for structure constructors,
3929 since trailing members may have been omitted from the constructor.
3930 It is also important for initialization of arrays from string constants
3931 since the full length of the string constant might not be wanted.
3932 It is also needed for initialization of unions, where the initializer's
3933 type is just one member, and that may not be as long as the union.
3935 There a case in which we would fail to output exactly SIZE bytes:
3936 for a structure constructor that wants to produce more than SIZE bytes.
3937 But such constructors will never be generated for any possible input.
3939 ALIGN is the alignment of the data in bits. */
3942 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
3944 enum tree_code code;
3945 unsigned HOST_WIDE_INT thissize;
3947 /* Some front-ends use constants other than the standard language-independent
3948 varieties, but which may still be output directly. Give the front-end a
3949 chance to convert EXP to a language-independent representation. */
3950 exp = lang_hooks.expand_constant (exp);
3952 if (size == 0 || flag_syntax_only)
3955 /* See if we're trying to initialize a pointer in a non-default mode
3956 to the address of some declaration somewhere. If the target says
3957 the mode is valid for pointers, assume the target has a way of
3959 if (TREE_CODE (exp) == NOP_EXPR
3960 && POINTER_TYPE_P (TREE_TYPE (exp))
3961 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
3963 tree saved_type = TREE_TYPE (exp);
3965 /* Peel off any intermediate conversions-to-pointer for valid
3967 while (TREE_CODE (exp) == NOP_EXPR
3968 && POINTER_TYPE_P (TREE_TYPE (exp))
3969 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
3970 exp = TREE_OPERAND (exp, 0);
3972 /* If what we're left with is the address of something, we can
3973 convert the address to the final type and output it that
3975 if (TREE_CODE (exp) == ADDR_EXPR)
3976 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
3977 /* Likewise for constant ints. */
3978 else if (TREE_CODE (exp) == INTEGER_CST)
3979 exp = build_int_cst_wide (saved_type, TREE_INT_CST_LOW (exp),
3980 TREE_INT_CST_HIGH (exp));
3984 /* Eliminate any conversions since we'll be outputting the underlying
3986 while (TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
3987 || TREE_CODE (exp) == NON_LVALUE_EXPR
3988 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
3990 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
3991 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
3993 /* Make sure eliminating the conversion is really a no-op, except with
3994 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
3995 union types to allow for Ada unchecked unions. */
3996 if (type_size > op_size
3997 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
3998 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
3999 internal_error ("no-op convert from %wd to %wd bytes in initializer",
4000 op_size, type_size);
4002 exp = TREE_OPERAND (exp, 0);
4005 code = TREE_CODE (TREE_TYPE (exp));
4006 thissize = int_size_in_bytes (TREE_TYPE (exp));
4008 /* Allow a constructor with no elements for any data type.
4009 This means to fill the space with zeros. */
4010 if (TREE_CODE (exp) == CONSTRUCTOR
4011 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (exp)))
4013 assemble_zeros (size);
4017 if (TREE_CODE (exp) == FDESC_EXPR)
4019 #ifdef ASM_OUTPUT_FDESC
4020 HOST_WIDE_INT part = tree_low_cst (TREE_OPERAND (exp, 1), 0);
4021 tree decl = TREE_OPERAND (exp, 0);
4022 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4029 /* Now output the underlying data. If we've handling the padding, return.
4030 Otherwise, break and ensure SIZE is the size written. */
4037 case REFERENCE_TYPE:
4039 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
4040 EXPAND_INITIALIZER),
4041 MIN (size, thissize), align, 0))
4042 error ("initializer for integer value is too complicated");
4046 if (TREE_CODE (exp) != REAL_CST)
4047 error ("initializer for floating value is not a floating constant");
4049 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)), align);
4053 output_constant (TREE_REALPART (exp), thissize / 2, align);
4054 output_constant (TREE_IMAGPART (exp), thissize / 2,
4055 min_align (align, BITS_PER_UNIT * (thissize / 2)));
4060 switch (TREE_CODE (exp))
4063 output_constructor (exp, size, align);
4066 thissize = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp),
4068 assemble_string (TREE_STRING_POINTER (exp), thissize);
4075 unsigned int nalign;
4076 enum machine_mode inner;
4078 inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4079 nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4081 elt_size = GET_MODE_SIZE (inner);
4083 link = TREE_VECTOR_CST_ELTS (exp);
4084 output_constant (TREE_VALUE (link), elt_size, align);
4085 while ((link = TREE_CHAIN (link)) != NULL)
4086 output_constant (TREE_VALUE (link), elt_size, nalign);
4096 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4097 output_constructor (exp, size, align);
4107 if (size > thissize)
4108 assemble_zeros (size - thissize);
4112 /* Subroutine of output_constructor, used for computing the size of
4113 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4114 type with an unspecified upper bound. */
4116 static unsigned HOST_WIDE_INT
4117 array_size_for_constructor (tree val)
4120 unsigned HOST_WIDE_INT cnt;
4123 /* This code used to attempt to handle string constants that are not
4124 arrays of single-bytes, but nothing else does, so there's no point in
4126 if (TREE_CODE (val) == STRING_CST)
4127 return TREE_STRING_LENGTH (val);
4129 max_index = NULL_TREE;
4130 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4132 if (TREE_CODE (index) == RANGE_EXPR)
4133 index = TREE_OPERAND (index, 1);
4134 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4138 if (max_index == NULL_TREE)
4141 /* Compute the total number of array elements. */
4142 i = size_binop (MINUS_EXPR, convert (sizetype, max_index),
4144 TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)))));
4145 i = size_binop (PLUS_EXPR, i, build_int_cst (sizetype, 1));
4147 /* Multiply by the array element unit size to find number of bytes. */
4148 i = size_binop (MULT_EXPR, i, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4150 return tree_low_cst (i, 1);
4153 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4154 Generate at least SIZE bytes, padding if necessary. */
4157 output_constructor (tree exp, unsigned HOST_WIDE_INT size,
4160 tree type = TREE_TYPE (exp);
4163 /* Number of bytes output or skipped so far.
4164 In other words, current position within the constructor. */
4165 HOST_WIDE_INT total_bytes = 0;
4166 /* Nonzero means BYTE contains part of a byte, to be output. */
4167 int byte_buffer_in_use = 0;
4169 unsigned HOST_WIDE_INT cnt;
4170 constructor_elt *ce;
4172 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
4174 if (TREE_CODE (type) == RECORD_TYPE)
4175 field = TYPE_FIELDS (type);
4177 if (TREE_CODE (type) == ARRAY_TYPE
4178 && TYPE_DOMAIN (type) != 0)
4179 min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (type));
4181 /* As LINK goes through the elements of the constant,
4182 FIELD goes through the structure fields, if the constant is a structure.
4183 if the constant is a union, then we override this,
4184 by getting the field from the TREE_LIST element.
4185 But the constant could also be an array. Then FIELD is zero.
4187 There is always a maximum of one element in the chain LINK for unions
4188 (even if the initializer in a source program incorrectly contains
4191 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), cnt, ce);
4192 cnt++, field = field ? TREE_CHAIN (field) : 0)
4194 tree val = ce->value;
4197 /* The element in a union constructor specifies the proper field
4199 if ((TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
4200 || TREE_CODE (type) == QUAL_UNION_TYPE)
4204 else if (TREE_CODE (type) == ARRAY_TYPE)
4207 #ifdef ASM_COMMENT_START
4208 if (field && flag_verbose_asm)
4209 fprintf (asm_out_file, "%s %s:\n",
4212 ? IDENTIFIER_POINTER (DECL_NAME (field))
4216 /* Eliminate the marker that makes a cast not be an lvalue. */
4220 if (index && TREE_CODE (index) == RANGE_EXPR)
4222 unsigned HOST_WIDE_INT fieldsize
4223 = int_size_in_bytes (TREE_TYPE (type));
4224 HOST_WIDE_INT lo_index = tree_low_cst (TREE_OPERAND (index, 0), 0);
4225 HOST_WIDE_INT hi_index = tree_low_cst (TREE_OPERAND (index, 1), 0);
4226 HOST_WIDE_INT index;
4227 unsigned int align2 = min_align (align, fieldsize * BITS_PER_UNIT);
4229 for (index = lo_index; index <= hi_index; index++)
4231 /* Output the element's initial value. */
4233 assemble_zeros (fieldsize);
4235 output_constant (val, fieldsize, align2);
4237 /* Count its size. */
4238 total_bytes += fieldsize;
4241 else if (field == 0 || !DECL_BIT_FIELD (field))
4243 /* An element that is not a bit-field. */
4245 unsigned HOST_WIDE_INT fieldsize;
4246 /* Since this structure is static,
4247 we know the positions are constant. */
4248 HOST_WIDE_INT pos = field ? int_byte_position (field) : 0;
4249 unsigned int align2;
4252 pos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val)), 1)
4253 * (tree_low_cst (index, 0) - tree_low_cst (min_index, 0)));
4255 /* Output any buffered-up bit-fields preceding this element. */
4256 if (byte_buffer_in_use)
4258 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4260 byte_buffer_in_use = 0;
4263 /* Advance to offset of this element.
4264 Note no alignment needed in an array, since that is guaranteed
4265 if each element has the proper size. */
4266 if ((field != 0 || index != 0) && pos != total_bytes)
4268 gcc_assert (pos >= total_bytes);
4269 assemble_zeros (pos - total_bytes);
4273 /* Find the alignment of this element. */
4274 align2 = min_align (align, BITS_PER_UNIT * pos);
4276 /* Determine size this element should occupy. */
4281 /* If this is an array with an unspecified upper bound,
4282 the initializer determines the size. */
4283 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4284 but we cannot do this until the deprecated support for
4285 initializing zero-length array members is removed. */
4286 if (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE
4287 && TYPE_DOMAIN (TREE_TYPE (field))
4288 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field))))
4290 fieldsize = array_size_for_constructor (val);
4291 /* Given a non-empty initialization, this field had
4293 gcc_assert (!fieldsize || !TREE_CHAIN (field));
4295 else if (DECL_SIZE_UNIT (field))
4297 /* ??? This can't be right. If the decl size overflows
4298 a host integer we will silently emit no data. */
4299 if (host_integerp (DECL_SIZE_UNIT (field), 1))
4300 fieldsize = tree_low_cst (DECL_SIZE_UNIT (field), 1);
4304 fieldsize = int_size_in_bytes (TREE_TYPE (type));
4306 /* Output the element's initial value. */
4308 assemble_zeros (fieldsize);
4310 output_constant (val, fieldsize, align2);
4312 /* Count its size. */
4313 total_bytes += fieldsize;
4315 else if (val != 0 && TREE_CODE (val) != INTEGER_CST)
4316 error ("invalid initial value for member %qs",
4317 IDENTIFIER_POINTER (DECL_NAME (field)));
4320 /* Element that is a bit-field. */
4322 HOST_WIDE_INT next_offset = int_bit_position (field);
4323 HOST_WIDE_INT end_offset
4324 = (next_offset + tree_low_cst (DECL_SIZE (field), 1));
4327 val = integer_zero_node;
4329 /* If this field does not start in this (or, next) byte,
4331 if (next_offset / BITS_PER_UNIT != total_bytes)
4333 /* Output remnant of any bit field in previous bytes. */
4334 if (byte_buffer_in_use)
4336 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4338 byte_buffer_in_use = 0;
4341 /* If still not at proper byte, advance to there. */
4342 if (next_offset / BITS_PER_UNIT != total_bytes)
4344 gcc_assert (next_offset / BITS_PER_UNIT >= total_bytes);
4345 assemble_zeros (next_offset / BITS_PER_UNIT - total_bytes);
4346 total_bytes = next_offset / BITS_PER_UNIT;
4350 if (! byte_buffer_in_use)
4353 /* We must split the element into pieces that fall within
4354 separate bytes, and combine each byte with previous or
4355 following bit-fields. */
4357 /* next_offset is the offset n fbits from the beginning of
4358 the structure to the next bit of this element to be processed.
4359 end_offset is the offset of the first bit past the end of
4361 while (next_offset < end_offset)
4365 HOST_WIDE_INT value;
4366 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
4367 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
4369 /* Advance from byte to byte
4370 within this element when necessary. */
4371 while (next_byte != total_bytes)
4373 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4378 /* Number of bits we can process at once
4379 (all part of the same byte). */
4380 this_time = MIN (end_offset - next_offset,
4381 BITS_PER_UNIT - next_bit);
4382 if (BYTES_BIG_ENDIAN)
4384 /* On big-endian machine, take the most significant bits
4385 first (of the bits that are significant)
4386 and put them into bytes from the most significant end. */
4387 shift = end_offset - next_offset - this_time;
4389 /* Don't try to take a bunch of bits that cross
4390 the word boundary in the INTEGER_CST. We can
4391 only select bits from the LOW or HIGH part
4393 if (shift < HOST_BITS_PER_WIDE_INT
4394 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4396 this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
4397 shift = HOST_BITS_PER_WIDE_INT;
4400 /* Now get the bits from the appropriate constant word. */
4401 if (shift < HOST_BITS_PER_WIDE_INT)
4402 value = TREE_INT_CST_LOW (val);
4405 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4406 value = TREE_INT_CST_HIGH (val);
4407 shift -= HOST_BITS_PER_WIDE_INT;
4410 /* Get the result. This works only when:
4411 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4412 byte |= (((value >> shift)
4413 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4414 << (BITS_PER_UNIT - this_time - next_bit));
4418 /* On little-endian machines,
4419 take first the least significant bits of the value
4420 and pack them starting at the least significant
4421 bits of the bytes. */
4422 shift = next_offset - int_bit_position (field);
4424 /* Don't try to take a bunch of bits that cross
4425 the word boundary in the INTEGER_CST. We can
4426 only select bits from the LOW or HIGH part
4428 if (shift < HOST_BITS_PER_WIDE_INT
4429 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4430 this_time = (HOST_BITS_PER_WIDE_INT - shift);
4432 /* Now get the bits from the appropriate constant word. */
4433 if (shift < HOST_BITS_PER_WIDE_INT)
4434 value = TREE_INT_CST_LOW (val);
4437 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4438 value = TREE_INT_CST_HIGH (val);
4439 shift -= HOST_BITS_PER_WIDE_INT;
4442 /* Get the result. This works only when:
4443 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4444 byte |= (((value >> shift)
4445 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4449 next_offset += this_time;
4450 byte_buffer_in_use = 1;
4455 if (byte_buffer_in_use)
4457 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4461 if ((unsigned HOST_WIDE_INT)total_bytes < size)
4462 assemble_zeros (size - total_bytes);
4465 /* This TREE_LIST contains any weak symbol declarations waiting
4467 static GTY(()) tree weak_decls;
4469 /* Mark DECL as weak. */
4472 mark_weak (tree decl)
4474 DECL_WEAK (decl) = 1;
4476 if (DECL_RTL_SET_P (decl)
4477 && MEM_P (DECL_RTL (decl))
4478 && XEXP (DECL_RTL (decl), 0)
4479 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
4480 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
4483 /* Merge weak status between NEWDECL and OLDDECL. */
4486 merge_weak (tree newdecl, tree olddecl)
4488 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
4490 if (DECL_WEAK (newdecl) && SUPPORTS_WEAK)
4493 /* We put the NEWDECL on the weak_decls list at some point
4494 and OLDDECL as well. Keep just OLDDECL on the list. */
4495 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
4496 if (TREE_VALUE (*pwd) == newdecl)
4498 *pwd = TREE_CHAIN (*pwd);
4505 if (DECL_WEAK (newdecl))
4509 /* NEWDECL is weak, but OLDDECL is not. */
4511 /* If we already output the OLDDECL, we're in trouble; we can't
4512 go back and make it weak. This error cannot caught in
4513 declare_weak because the NEWDECL and OLDDECL was not yet
4514 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4515 if (TREE_ASM_WRITTEN (olddecl))
4516 error ("weak declaration of %q+D must precede definition",
4519 /* If we've already generated rtl referencing OLDDECL, we may
4520 have done so in a way that will not function properly with
4522 else if (TREE_USED (olddecl)
4523 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)))
4524 warning (0, "weak declaration of %q+D after first use results "
4525 "in unspecified behavior", newdecl);
4529 /* We put the NEWDECL on the weak_decls list at some point.
4530 Replace it with the OLDDECL. */
4531 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
4532 if (TREE_VALUE (wd) == newdecl)
4534 TREE_VALUE (wd) = olddecl;
4537 /* We may not find the entry on the list. If NEWDECL is a
4538 weak alias, then we will have already called
4539 globalize_decl to remove the entry; in that case, we do
4540 not need to do anything. */
4543 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4544 mark_weak (olddecl);
4547 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4548 weak. Just update NEWDECL to indicate that it's weak too. */
4549 mark_weak (newdecl);
4552 /* Declare DECL to be a weak symbol. */
4555 declare_weak (tree decl)
4557 if (! TREE_PUBLIC (decl))
4558 error ("weak declaration of %q+D must be public", decl);
4559 else if (TREE_CODE (decl) == FUNCTION_DECL && TREE_ASM_WRITTEN (decl))
4560 error ("weak declaration of %q+D must precede definition", decl);
4561 else if (SUPPORTS_WEAK)
4563 if (! DECL_WEAK (decl))
4564 weak_decls = tree_cons (NULL, decl, weak_decls);
4567 warning (0, "weak declaration of %q+D not supported", decl);
4573 weak_finish_1 (tree decl)
4575 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
4576 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4579 if (! TREE_USED (decl))
4582 #ifdef ASM_WEAKEN_DECL
4583 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
4585 #ifdef ASM_WEAKEN_LABEL
4586 ASM_WEAKEN_LABEL (asm_out_file, name);
4588 #ifdef ASM_OUTPUT_WEAK_ALIAS
4590 static bool warn_once = 0;
4593 warning (0, "only weak aliases are supported in this configuration");
4603 /* This TREE_LIST contains weakref targets. */
4605 static GTY(()) tree weakref_targets;
4607 /* Forward declaration. */
4608 static tree find_decl_and_mark_needed (tree decl, tree target);
4610 /* Emit any pending weak declarations. */
4617 for (t = weakref_targets; t; t = TREE_CHAIN (t))
4619 tree alias_decl = TREE_PURPOSE (t);
4620 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
4622 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
4623 /* Remove alias_decl from the weak list, but leave entries for
4624 the target alone. */
4626 #ifndef ASM_OUTPUT_WEAKREF
4627 else if (! TREE_SYMBOL_REFERENCED (target))
4629 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
4630 defined, otherwise we and weak_finish_1 would use a
4631 different macros. */
4632 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
4633 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
4635 tree decl = find_decl_and_mark_needed (alias_decl, target);
4639 decl = build_decl (TREE_CODE (alias_decl), target,
4640 TREE_TYPE (alias_decl));
4642 DECL_EXTERNAL (decl) = 1;
4643 TREE_PUBLIC (decl) = 1;
4644 DECL_ARTIFICIAL (decl) = 1;
4645 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
4646 TREE_USED (decl) = 1;
4649 weak_finish_1 (decl);
4658 /* Remove the alias and the target from the pending weak list
4659 so that we do not emit any .weak directives for the former,
4660 nor multiple .weak directives for the latter. */
4661 for (p = &weak_decls; (t2 = *p) ; )
4663 if (TREE_VALUE (t2) == alias_decl
4664 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
4665 *p = TREE_CHAIN (t2);
4667 p = &TREE_CHAIN (t2);
4670 /* Remove other weakrefs to the same target, to speed things up. */
4671 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
4673 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
4674 *p = TREE_CHAIN (t2);
4676 p = &TREE_CHAIN (t2);
4681 for (t = weak_decls; t; t = TREE_CHAIN (t))
4683 tree decl = TREE_VALUE (t);
4685 weak_finish_1 (decl);
4689 /* Emit the assembly bits to indicate that DECL is globally visible. */
4692 globalize_decl (tree decl)
4694 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
4696 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
4697 if (DECL_WEAK (decl))
4701 #ifdef ASM_WEAKEN_DECL
4702 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
4704 ASM_WEAKEN_LABEL (asm_out_file, name);
4707 /* Remove this function from the pending weak list so that
4708 we do not emit multiple .weak directives for it. */
4709 for (p = &weak_decls; (t = *p) ; )
4711 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
4712 *p = TREE_CHAIN (t);
4714 p = &TREE_CHAIN (t);
4717 /* Remove weakrefs to the same target from the pending weakref
4718 list, for the same reason. */
4719 for (p = &weakref_targets; (t = *p) ; )
4721 if (DECL_ASSEMBLER_NAME (decl)
4722 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
4723 *p = TREE_CHAIN (t);
4725 p = &TREE_CHAIN (t);
4730 #elif defined(ASM_MAKE_LABEL_LINKONCE)
4731 if (DECL_ONE_ONLY (decl))
4732 ASM_MAKE_LABEL_LINKONCE (asm_out_file, name);
4735 targetm.asm_out.globalize_label (asm_out_file, name);
4738 /* We have to be able to tell cgraph about the needed-ness of the target
4739 of an alias. This requires that the decl have been defined. Aliases
4740 that precede their definition have to be queued for later processing. */
4742 typedef struct alias_pair GTY(())
4748 /* Define gc'd vector type. */
4749 DEF_VEC_O(alias_pair);
4750 DEF_VEC_ALLOC_O(alias_pair,gc);
4752 static GTY(()) VEC(alias_pair,gc) *alias_pairs;
4754 /* Given an assembly name, find the decl it is associated with. At the
4755 same time, mark it needed for cgraph. */
4758 find_decl_and_mark_needed (tree decl, tree target)
4760 struct cgraph_node *fnode = NULL;
4761 struct cgraph_varpool_node *vnode = NULL;
4763 if (TREE_CODE (decl) == FUNCTION_DECL)
4765 fnode = cgraph_node_for_asm (target);
4767 vnode = cgraph_varpool_node_for_asm (target);
4771 vnode = cgraph_varpool_node_for_asm (target);
4773 fnode = cgraph_node_for_asm (target);
4778 /* We can't mark function nodes as used after cgraph global info
4779 is finished. This wouldn't generally be necessary, but C++
4780 virtual table thunks are introduced late in the game and
4781 might seem like they need marking, although in fact they
4783 if (! cgraph_global_info_ready)
4784 cgraph_mark_needed_node (fnode);
4789 cgraph_varpool_mark_needed_node (vnode);
4796 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
4797 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
4798 tree node is DECL to have the value of the tree node TARGET. */
4801 do_assemble_alias (tree decl, tree target)
4803 if (TREE_ASM_WRITTEN (decl))
4806 TREE_ASM_WRITTEN (decl) = 1;
4807 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
4809 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
4811 ultimate_transparent_alias_target (&target);
4813 if (!TREE_SYMBOL_REFERENCED (target))
4814 weakref_targets = tree_cons (decl, target, weakref_targets);
4816 #ifdef ASM_OUTPUT_WEAKREF
4817 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
4818 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
4819 IDENTIFIER_POINTER (target));
4823 error ("%Jweakref is not supported in this configuration", decl);
4830 #ifdef ASM_OUTPUT_DEF
4831 /* Make name accessible from other files, if appropriate. */
4833 if (TREE_PUBLIC (decl))
4835 globalize_decl (decl);
4836 maybe_assemble_visibility (decl);
4839 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
4840 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
4842 ASM_OUTPUT_DEF (asm_out_file,
4843 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
4844 IDENTIFIER_POINTER (target));
4846 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
4851 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4852 # ifdef ASM_WEAKEN_DECL
4853 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
4855 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
4857 /* Remove this function from the pending weak list so that
4858 we do not emit multiple .weak directives for it. */
4859 for (p = &weak_decls; (t = *p) ; )
4860 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
4861 *p = TREE_CHAIN (t);
4863 p = &TREE_CHAIN (t);
4865 /* Remove weakrefs to the same target from the pending weakref
4866 list, for the same reason. */
4867 for (p = &weakref_targets; (t = *p) ; )
4869 if (DECL_ASSEMBLER_NAME (decl)
4870 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
4871 *p = TREE_CHAIN (t);
4873 p = &TREE_CHAIN (t);
4879 /* First pass of completing pending aliases. Make sure that cgraph knows
4880 which symbols will be required. */
4883 finish_aliases_1 (void)
4888 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
4892 target_decl = find_decl_and_mark_needed (p->decl, p->target);
4893 if (target_decl == NULL)
4895 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
4896 error ("%q+D aliased to undefined symbol %qs",
4897 p->decl, IDENTIFIER_POINTER (p->target));
4899 else if (DECL_EXTERNAL (target_decl)
4900 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
4901 error ("%q+D aliased to external symbol %qs",
4902 p->decl, IDENTIFIER_POINTER (p->target));
4906 /* Second pass of completing pending aliases. Emit the actual assembly.
4907 This happens at the end of compilation and thus it is assured that the
4908 target symbol has been emitted. */
4911 finish_aliases_2 (void)
4916 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
4917 do_assemble_alias (p->decl, p->target);
4919 VEC_truncate (alias_pair, alias_pairs, 0);
4922 /* Emit an assembler directive to make the symbol for DECL an alias to
4923 the symbol for TARGET. */
4926 assemble_alias (tree decl, tree target)
4929 bool is_weakref = false;
4931 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
4933 tree alias = DECL_ASSEMBLER_NAME (decl);
4937 ultimate_transparent_alias_target (&target);
4939 if (alias == target)
4940 error ("weakref %q+D ultimately targets itself", decl);
4943 #ifndef ASM_OUTPUT_WEAKREF
4944 IDENTIFIER_TRANSPARENT_ALIAS (alias) = 1;
4945 TREE_CHAIN (alias) = target;
4948 if (TREE_PUBLIC (decl))
4949 error ("weakref %q+D must have static linkage", decl);
4953 #if !defined (ASM_OUTPUT_DEF)
4954 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
4955 error ("%Jalias definitions not supported in this configuration", decl);
4958 if (!DECL_WEAK (decl))
4960 error ("%Jonly weak aliases are supported in this configuration", decl);
4967 /* We must force creation of DECL_RTL for debug info generation, even though
4968 we don't use it here. */
4969 make_decl_rtl (decl);
4970 TREE_USED (decl) = 1;
4972 /* A quirk of the initial implementation of aliases required that the user
4973 add "extern" to all of them. Which is silly, but now historical. Do
4974 note that the symbol is in fact locally defined. */
4976 DECL_EXTERNAL (decl) = 0;
4978 /* Allow aliases to aliases. */
4979 if (TREE_CODE (decl) == FUNCTION_DECL)
4980 cgraph_node (decl)->alias = true;
4982 cgraph_varpool_node (decl)->alias = true;
4984 /* If the target has already been emitted, we don't have to queue the
4985 alias. This saves a tad o memory. */
4986 target_decl = find_decl_and_mark_needed (decl, target);
4987 if (target_decl && TREE_ASM_WRITTEN (target_decl))
4988 do_assemble_alias (decl, target);
4991 alias_pair *p = VEC_safe_push (alias_pair, gc, alias_pairs, NULL);
4997 /* Emit an assembler directive to set symbol for DECL visibility to
4998 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5001 default_assemble_visibility (tree decl, int vis)
5003 static const char * const visibility_types[] = {
5004 NULL, "internal", "hidden", "protected"
5007 const char *name, *type;
5009 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5010 type = visibility_types[vis];
5012 #ifdef HAVE_GAS_HIDDEN
5013 fprintf (asm_out_file, "\t.%s\t", type);
5014 assemble_name (asm_out_file, name);
5015 fprintf (asm_out_file, "\n");
5017 warning (OPT_Wattributes, "visibility attribute not supported "
5018 "in this configuration; ignored");
5022 /* A helper function to call assemble_visibility when needed for a decl. */
5025 maybe_assemble_visibility (tree decl)
5027 enum symbol_visibility vis = DECL_VISIBILITY (decl);
5029 if (vis != VISIBILITY_DEFAULT)
5030 targetm.asm_out.visibility (decl, vis);
5033 /* Returns 1 if the target configuration supports defining public symbols
5034 so that one of them will be chosen at link time instead of generating a
5035 multiply-defined symbol error, whether through the use of weak symbols or
5036 a target-specific mechanism for having duplicates discarded. */
5039 supports_one_only (void)
5041 if (SUPPORTS_ONE_ONLY)
5043 return SUPPORTS_WEAK;
5046 /* Set up DECL as a public symbol that can be defined in multiple
5047 translation units without generating a linker error. */
5050 make_decl_one_only (tree decl)
5052 gcc_assert (TREE_CODE (decl) == VAR_DECL
5053 || TREE_CODE (decl) == FUNCTION_DECL);
5055 TREE_PUBLIC (decl) = 1;
5057 if (SUPPORTS_ONE_ONLY)
5059 #ifdef MAKE_DECL_ONE_ONLY
5060 MAKE_DECL_ONE_ONLY (decl);
5062 DECL_ONE_ONLY (decl) = 1;
5064 else if (TREE_CODE (decl) == VAR_DECL
5065 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
5066 DECL_COMMON (decl) = 1;
5069 gcc_assert (SUPPORTS_WEAK);
5070 DECL_WEAK (decl) = 1;
5075 init_varasm_once (void)
5077 section_htab = htab_create_ggc (31, section_entry_hash,
5078 section_entry_eq, NULL);
5079 object_block_htab = htab_create_ggc (31, object_block_entry_hash,
5080 object_block_entry_eq, NULL);
5081 const_desc_htab = htab_create_ggc (1009, const_desc_hash,
5082 const_desc_eq, NULL);
5084 const_alias_set = new_alias_set ();
5086 #ifdef TEXT_SECTION_ASM_OP
5087 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
5088 TEXT_SECTION_ASM_OP);
5091 #ifdef DATA_SECTION_ASM_OP
5092 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5093 DATA_SECTION_ASM_OP);
5096 #ifdef SDATA_SECTION_ASM_OP
5097 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5098 SDATA_SECTION_ASM_OP);
5101 #ifdef READONLY_DATA_SECTION_ASM_OP
5102 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
5103 READONLY_DATA_SECTION_ASM_OP);
5106 #ifdef CTORS_SECTION_ASM_OP
5107 ctors_section = get_unnamed_section (0, output_section_asm_op,
5108 CTORS_SECTION_ASM_OP);
5111 #ifdef DTORS_SECTION_ASM_OP
5112 dtors_section = get_unnamed_section (0, output_section_asm_op,
5113 DTORS_SECTION_ASM_OP);
5116 #ifdef BSS_SECTION_ASM_OP
5117 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5118 output_section_asm_op,
5119 BSS_SECTION_ASM_OP);
5122 #ifdef SBSS_SECTION_ASM_OP
5123 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5124 output_section_asm_op,
5125 SBSS_SECTION_ASM_OP);
5128 targetm.asm_out.init_sections ();
5130 if (readonly_data_section == NULL)
5131 readonly_data_section = text_section;
5135 decl_default_tls_model (tree decl)
5137 enum tls_model kind;
5140 is_local = targetm.binds_local_p (decl);
5144 kind = TLS_MODEL_LOCAL_EXEC;
5146 kind = TLS_MODEL_INITIAL_EXEC;
5149 /* Local dynamic is inefficient when we're not combining the
5150 parts of the address. */
5151 else if (optimize && is_local)
5152 kind = TLS_MODEL_LOCAL_DYNAMIC;
5154 kind = TLS_MODEL_GLOBAL_DYNAMIC;
5155 if (kind < flag_tls_default)
5156 kind = flag_tls_default;
5161 /* Select a set of attributes for section NAME based on the properties
5162 of DECL and whether or not RELOC indicates that DECL's initializer
5163 might contain runtime relocations.
5165 We make the section read-only and executable for a function decl,
5166 read-only for a const data decl, and writable for a non-const data decl. */
5169 default_section_type_flags (tree decl, const char *name, int reloc)
5171 return default_section_type_flags_1 (decl, name, reloc, flag_pic);
5175 default_section_type_flags_1 (tree decl, const char *name, int reloc,
5180 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
5181 flags = SECTION_CODE;
5182 else if (decl && decl_readonly_section_1 (decl, reloc, shlib))
5184 else if (current_function_decl
5186 && cfun->unlikely_text_section_name
5187 && strcmp (name, cfun->unlikely_text_section_name) == 0)
5188 flags = SECTION_CODE;
5190 && (!current_function_decl || !cfun)
5191 && strcmp (name, UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
5192 flags = SECTION_CODE;
5194 flags = SECTION_WRITE;
5196 if (decl && DECL_ONE_ONLY (decl))
5197 flags |= SECTION_LINKONCE;
5199 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5200 flags |= SECTION_TLS | SECTION_WRITE;
5202 if (strcmp (name, ".bss") == 0
5203 || strncmp (name, ".bss.", 5) == 0
5204 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
5205 || strcmp (name, ".sbss") == 0
5206 || strncmp (name, ".sbss.", 6) == 0
5207 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
5208 flags |= SECTION_BSS;
5210 if (strcmp (name, ".tdata") == 0
5211 || strncmp (name, ".tdata.", 7) == 0
5212 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
5213 flags |= SECTION_TLS;
5215 if (strcmp (name, ".tbss") == 0
5216 || strncmp (name, ".tbss.", 6) == 0
5217 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
5218 flags |= SECTION_TLS | SECTION_BSS;
5220 /* These three sections have special ELF types. They are neither
5221 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5222 want to print a section type (@progbits or @nobits). If someone
5223 is silly enough to emit code or TLS variables to one of these
5224 sections, then don't handle them specially. */
5225 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
5226 && (strcmp (name, ".init_array") == 0
5227 || strcmp (name, ".fini_array") == 0
5228 || strcmp (name, ".preinit_array") == 0))
5229 flags |= SECTION_NOTYPE;
5234 /* Output assembly to switch to section NAME with attribute FLAGS.
5235 Four variants for common object file formats. */
5238 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
5239 unsigned int flags ATTRIBUTE_UNUSED,
5240 tree decl ATTRIBUTE_UNUSED)
5242 /* Some object formats don't support named sections at all. The
5243 front-end should already have flagged this as an error. */
5248 default_elf_asm_named_section (const char *name, unsigned int flags,
5249 tree decl ATTRIBUTE_UNUSED)
5251 char flagchars[10], *f = flagchars;
5253 /* If we have already declared this section, we can use an
5254 abbreviated form to switch back to it -- unless this section is
5255 part of a COMDAT groups, in which case GAS requires the full
5256 declaration every time. */
5257 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5258 && (flags & SECTION_DECLARED))
5260 fprintf (asm_out_file, "\t.section\t%s\n", name);
5264 if (!(flags & SECTION_DEBUG))
5266 if (flags & SECTION_WRITE)
5268 if (flags & SECTION_CODE)
5270 if (flags & SECTION_SMALL)
5272 if (flags & SECTION_MERGE)
5274 if (flags & SECTION_STRINGS)
5276 if (flags & SECTION_TLS)
5278 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5282 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
5284 if (!(flags & SECTION_NOTYPE))
5289 if (flags & SECTION_BSS)
5295 #ifdef ASM_COMMENT_START
5296 /* On platforms that use "@" as the assembly comment character,
5298 if (strcmp (ASM_COMMENT_START, "@") == 0)
5301 fprintf (asm_out_file, format, type);
5303 if (flags & SECTION_ENTSIZE)
5304 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
5305 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5306 fprintf (asm_out_file, ",%s,comdat",
5307 lang_hooks.decls.comdat_group (decl));
5310 putc ('\n', asm_out_file);
5314 default_coff_asm_named_section (const char *name, unsigned int flags,
5315 tree decl ATTRIBUTE_UNUSED)
5317 char flagchars[8], *f = flagchars;
5319 if (flags & SECTION_WRITE)
5321 if (flags & SECTION_CODE)
5325 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
5329 default_pe_asm_named_section (const char *name, unsigned int flags,
5332 default_coff_asm_named_section (name, flags, decl);
5334 if (flags & SECTION_LINKONCE)
5336 /* Functions may have been compiled at various levels of
5337 optimization so we can't use `same_size' here.
5338 Instead, have the linker pick one. */
5339 fprintf (asm_out_file, "\t.linkonce %s\n",
5340 (flags & SECTION_CODE ? "discard" : "same_size"));
5344 /* The lame default section selector. */
5347 default_select_section (tree decl, int reloc,
5348 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
5352 if (decl_readonly_section (decl, reloc))
5353 return readonly_data_section;
5355 else if (TREE_CODE (decl) == CONSTRUCTOR)
5357 if (! ((flag_pic && reloc)
5358 || !TREE_READONLY (decl)
5359 || TREE_SIDE_EFFECTS (decl)
5360 || !TREE_CONSTANT (decl)))
5361 return readonly_data_section;
5363 else if (TREE_CODE (decl) == STRING_CST)
5364 return readonly_data_section;
5365 else if (! (flag_pic && reloc))
5366 return readonly_data_section;
5368 return data_section;
5371 enum section_category
5372 categorize_decl_for_section (tree decl, int reloc, int shlib)
5374 enum section_category ret;
5376 if (TREE_CODE (decl) == FUNCTION_DECL)
5378 else if (TREE_CODE (decl) == STRING_CST)
5380 if (flag_mudflap) /* or !flag_merge_constants */
5381 return SECCAT_RODATA;
5383 return SECCAT_RODATA_MERGE_STR;
5385 else if (TREE_CODE (decl) == VAR_DECL)
5387 if (DECL_INITIAL (decl) == NULL
5388 || DECL_INITIAL (decl) == error_mark_node
5389 || (flag_zero_initialized_in_bss
5390 /* Leave constant zeroes in .rodata so they can be shared. */
5391 && !TREE_READONLY (decl)
5392 && initializer_zerop (DECL_INITIAL (decl))))
5394 else if (! TREE_READONLY (decl)
5395 || TREE_SIDE_EFFECTS (decl)
5396 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
5398 if (shlib && (reloc & 2))
5399 ret = SECCAT_DATA_REL;
5400 else if (shlib && reloc)
5401 ret = SECCAT_DATA_REL_LOCAL;
5405 else if (shlib && (reloc & 2))
5406 ret = SECCAT_DATA_REL_RO;
5407 else if (shlib && reloc)
5408 ret = SECCAT_DATA_REL_RO_LOCAL;
5409 else if (reloc || flag_merge_constants < 2)
5410 /* C and C++ don't allow different variables to share the same
5411 location. -fmerge-all-constants allows even that (at the
5412 expense of not conforming). */
5413 ret = SECCAT_RODATA;
5414 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
5415 ret = SECCAT_RODATA_MERGE_STR_INIT;
5417 ret = SECCAT_RODATA_MERGE_CONST;
5419 else if (TREE_CODE (decl) == CONSTRUCTOR)
5421 if ((shlib && reloc)
5422 || TREE_SIDE_EFFECTS (decl)
5423 || ! TREE_CONSTANT (decl))
5426 ret = SECCAT_RODATA;
5429 ret = SECCAT_RODATA;
5431 /* There are no read-only thread-local sections. */
5432 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5434 /* Note that this would be *just* SECCAT_BSS, except that there's
5435 no concept of a read-only thread-local-data section. */
5436 if (ret == SECCAT_BSS
5437 || (flag_zero_initialized_in_bss
5438 && initializer_zerop (DECL_INITIAL (decl))))
5444 /* If the target uses small data sections, select it. */
5445 else if (targetm.in_small_data_p (decl))
5447 if (ret == SECCAT_BSS)
5449 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
5450 ret = SECCAT_SRODATA;
5459 decl_readonly_section (tree decl, int reloc)
5461 return decl_readonly_section_1 (decl, reloc, flag_pic);
5465 decl_readonly_section_1 (tree decl, int reloc, int shlib)
5467 switch (categorize_decl_for_section (decl, reloc, shlib))
5470 case SECCAT_RODATA_MERGE_STR:
5471 case SECCAT_RODATA_MERGE_STR_INIT:
5472 case SECCAT_RODATA_MERGE_CONST:
5473 case SECCAT_SRODATA:
5482 /* Select a section based on the above categorization. */
5485 default_elf_select_section (tree decl, int reloc,
5486 unsigned HOST_WIDE_INT align)
5488 return default_elf_select_section_1 (decl, reloc, align, flag_pic);
5492 default_elf_select_section_1 (tree decl, int reloc,
5493 unsigned HOST_WIDE_INT align, int shlib)
5496 switch (categorize_decl_for_section (decl, reloc, shlib))
5499 /* We're not supposed to be called on FUNCTION_DECLs. */
5502 return readonly_data_section;
5503 case SECCAT_RODATA_MERGE_STR:
5504 return mergeable_string_section (decl, align, 0);
5505 case SECCAT_RODATA_MERGE_STR_INIT:
5506 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
5507 case SECCAT_RODATA_MERGE_CONST:
5508 return mergeable_constant_section (DECL_MODE (decl), align, 0);
5509 case SECCAT_SRODATA:
5513 return data_section;
5514 case SECCAT_DATA_REL:
5515 sname = ".data.rel";
5517 case SECCAT_DATA_REL_LOCAL:
5518 sname = ".data.rel.local";
5520 case SECCAT_DATA_REL_RO:
5521 sname = ".data.rel.ro";
5523 case SECCAT_DATA_REL_RO_LOCAL:
5524 sname = ".data.rel.ro.local";
5549 return get_named_section (decl, sname, reloc);
5552 /* Construct a unique section name based on the decl name and the
5553 categorization performed above. */
5556 default_unique_section (tree decl, int reloc)
5558 default_unique_section_1 (decl, reloc, flag_pic);
5562 default_unique_section_1 (tree decl, int reloc, int shlib)
5564 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
5565 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
5566 const char *prefix, *name;
5570 switch (categorize_decl_for_section (decl, reloc, shlib))
5573 prefix = one_only ? ".gnu.linkonce.t." : ".text.";
5576 case SECCAT_RODATA_MERGE_STR:
5577 case SECCAT_RODATA_MERGE_STR_INIT:
5578 case SECCAT_RODATA_MERGE_CONST:
5579 prefix = one_only ? ".gnu.linkonce.r." : ".rodata.";
5581 case SECCAT_SRODATA:
5582 prefix = one_only ? ".gnu.linkonce.s2." : ".sdata2.";
5585 prefix = one_only ? ".gnu.linkonce.d." : ".data.";
5587 case SECCAT_DATA_REL:
5588 prefix = one_only ? ".gnu.linkonce.d.rel." : ".data.rel.";
5590 case SECCAT_DATA_REL_LOCAL:
5591 prefix = one_only ? ".gnu.linkonce.d.rel.local." : ".data.rel.local.";
5593 case SECCAT_DATA_REL_RO:
5594 prefix = one_only ? ".gnu.linkonce.d.rel.ro." : ".data.rel.ro.";
5596 case SECCAT_DATA_REL_RO_LOCAL:
5597 prefix = one_only ? ".gnu.linkonce.d.rel.ro.local."
5598 : ".data.rel.ro.local.";
5601 prefix = one_only ? ".gnu.linkonce.s." : ".sdata.";
5604 prefix = one_only ? ".gnu.linkonce.b." : ".bss.";
5607 prefix = one_only ? ".gnu.linkonce.sb." : ".sbss.";
5610 prefix = one_only ? ".gnu.linkonce.td." : ".tdata.";
5613 prefix = one_only ? ".gnu.linkonce.tb." : ".tbss.";
5618 plen = strlen (prefix);
5620 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5621 name = targetm.strip_name_encoding (name);
5622 nlen = strlen (name);
5624 string = alloca (nlen + plen + 1);
5625 memcpy (string, prefix, plen);
5626 memcpy (string + plen, name, nlen + 1);
5628 DECL_SECTION_NAME (decl) = build_string (nlen + plen, string);
5632 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED,
5634 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
5637 switch (GET_CODE (x))
5642 return data_section;
5648 return readonly_data_section;
5652 default_elf_select_rtx_section (enum machine_mode mode, rtx x,
5653 unsigned HOST_WIDE_INT align)
5655 /* ??? Handle small data here somehow. */
5658 switch (GET_CODE (x))
5662 return get_named_section (NULL, ".data.rel.ro", 3);
5665 return get_named_section (NULL, ".data.rel.ro.local", 1);
5671 return mergeable_constant_section (mode, align, 0);
5674 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
5677 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
5682 /* Careful not to prod global register variables. */
5685 symbol = XEXP (rtl, 0);
5686 if (GET_CODE (symbol) != SYMBOL_REF)
5689 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_IN_BLOCK;
5690 if (TREE_CODE (decl) == FUNCTION_DECL)
5691 flags |= SYMBOL_FLAG_FUNCTION;
5692 if (targetm.binds_local_p (decl))
5693 flags |= SYMBOL_FLAG_LOCAL;
5694 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5695 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
5696 else if (targetm.in_small_data_p (decl))
5697 flags |= SYMBOL_FLAG_SMALL;
5698 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
5699 being PUBLIC, the thing *must* be defined in this translation unit.
5700 Prevent this buglet from being propagated into rtl code as well. */
5701 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
5702 flags |= SYMBOL_FLAG_EXTERNAL;
5704 SYMBOL_REF_FLAGS (symbol) = flags;
5707 /* By default, we do nothing for encode_section_info, so we need not
5708 do anything but discard the '*' marker. */
5711 default_strip_name_encoding (const char *str)
5713 return str + (*str == '*');
5716 #ifdef ASM_OUTPUT_DEF
5717 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
5718 anchor relative to ".", the current section position. */
5721 default_asm_output_anchor (rtx symbol)
5725 sprintf (buffer, ". + " HOST_WIDE_INT_PRINT_DEC,
5726 SYMBOL_REF_BLOCK_OFFSET (symbol));
5727 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
5731 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
5734 default_use_anchors_for_symbol_p (rtx symbol)
5739 /* Don't use anchors for mergeable sections. The linker might move
5740 the objects around. */
5741 sect = SYMBOL_REF_BLOCK (symbol)->sect;
5742 if (sect->common.flags & SECTION_MERGE)
5745 /* Don't use anchors for small data sections. The small data register
5746 acts as an anchor for such sections. */
5747 if (sect->common.flags & SECTION_SMALL)
5750 decl = SYMBOL_REF_DECL (symbol);
5751 if (decl && DECL_P (decl))
5753 /* Don't use section anchors for decls that might be defined by
5755 if (!targetm.binds_local_p (decl))
5758 /* Don't use section anchors for decls that will be placed in a
5759 small data section. */
5760 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
5761 one above. The problem is that we only use SECTION_SMALL for
5762 sections that should be marked as small in the section directive. */
5763 if (targetm.in_small_data_p (decl))
5769 /* Assume ELF-ish defaults, since that's pretty much the most liberal
5770 wrt cross-module name binding. */
5773 default_binds_local_p (tree exp)
5775 return default_binds_local_p_1 (exp, flag_shlib);
5779 default_binds_local_p_1 (tree exp, int shlib)
5783 /* A non-decl is an entry in the constant pool. */
5786 /* Weakrefs may not bind locally, even though the weakref itself is
5787 always static and therefore local. */
5788 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp)))
5790 /* Static variables are always local. */
5791 else if (! TREE_PUBLIC (exp))
5793 /* A variable is local if the user has said explicitly that it will
5795 else if (DECL_VISIBILITY_SPECIFIED (exp)
5796 && DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
5798 /* Variables defined outside this object might not be local. */
5799 else if (DECL_EXTERNAL (exp))
5801 /* If defined in this object and visibility is not default, must be
5803 else if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
5805 /* Default visibility weak data can be overridden by a strong symbol
5806 in another module and so are not local. */
5807 else if (DECL_WEAK (exp))
5809 /* If PIC, then assume that any global name can be overridden by
5810 symbols resolved from other modules. */
5813 /* Uninitialized COMMON variable may be unified with symbols
5814 resolved from other modules. */
5815 else if (DECL_COMMON (exp)
5816 && (DECL_INITIAL (exp) == NULL
5817 || DECL_INITIAL (exp) == error_mark_node))
5819 /* Otherwise we're left with initialized (or non-common) global data
5820 which is of necessity defined locally. */
5827 /* Determine whether or not a pointer mode is valid. Assume defaults
5828 of ptr_mode or Pmode - can be overridden. */
5830 default_valid_pointer_mode (enum machine_mode mode)
5832 return (mode == ptr_mode || mode == Pmode);
5835 /* Default function to output code that will globalize a label. A
5836 target must define GLOBAL_ASM_OP or provide its own function to
5837 globalize a label. */
5838 #ifdef GLOBAL_ASM_OP
5840 default_globalize_label (FILE * stream, const char *name)
5842 fputs (GLOBAL_ASM_OP, stream);
5843 assemble_name (stream, name);
5844 putc ('\n', stream);
5846 #endif /* GLOBAL_ASM_OP */
5848 /* Default function to output a label for unwind information. The
5849 default is to do nothing. A target that needs nonlocal labels for
5850 unwind information must provide its own function to do this. */
5852 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
5853 tree decl ATTRIBUTE_UNUSED,
5854 int for_eh ATTRIBUTE_UNUSED,
5855 int empty ATTRIBUTE_UNUSED)
5859 /* Default function to output a label to divide up the exception table.
5860 The default is to do nothing. A target that needs/wants to divide
5861 up the table must provide it's own function to do this. */
5863 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
5867 /* This is how to output an internal numbered label where PREFIX is
5868 the class of label and LABELNO is the number within the class. */
5871 default_internal_label (FILE *stream, const char *prefix,
5872 unsigned long labelno)
5874 char *const buf = alloca (40 + strlen (prefix));
5875 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
5876 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
5879 /* This is the default behavior at the beginning of a file. It's
5880 controlled by two other target-hook toggles. */
5882 default_file_start (void)
5884 if (targetm.file_start_app_off && !flag_verbose_asm)
5885 fputs (ASM_APP_OFF, asm_out_file);
5887 if (targetm.file_start_file_directive)
5888 output_file_directive (asm_out_file, main_input_filename);
5891 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
5892 which emits a special section directive used to indicate whether or
5893 not this object file needs an executable stack. This is primarily
5894 a GNU extension to ELF but could be used on other targets. */
5896 int trampolines_created;
5899 file_end_indicate_exec_stack (void)
5901 unsigned int flags = SECTION_DEBUG;
5902 if (trampolines_created)
5903 flags |= SECTION_CODE;
5905 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
5908 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
5909 a get_unnamed_section callback. */
5912 output_section_asm_op (const void *directive)
5914 fprintf (asm_out_file, "%s\n", (const char *) directive);
5917 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
5918 the current section is NEW_SECTION. */
5921 switch_to_section (section *new_section)
5923 if (in_section == new_section)
5926 if (new_section->common.flags & SECTION_FORGET)
5929 in_section = new_section;
5931 if (new_section->common.flags & SECTION_NAMED)
5934 && !cfun->unlikely_text_section_name
5935 && strcmp (new_section->named.name,
5936 UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
5937 cfun->unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
5939 targetm.asm_out.named_section (new_section->named.name,
5940 new_section->named.common.flags,
5941 new_section->named.decl);
5944 new_section->unnamed.callback (new_section->unnamed.data);
5946 new_section->common.flags |= SECTION_DECLARED;
5949 /* If block symbol SYMBOL has not yet been assigned an offset, place
5950 it at the end of its block. */
5953 place_block_symbol (rtx symbol)
5955 unsigned HOST_WIDE_INT size, mask, offset;
5956 struct constant_descriptor_rtx *desc;
5957 unsigned int alignment;
5958 struct object_block *block;
5961 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
5964 /* Work out the symbol's size and alignment. */
5965 if (CONSTANT_POOL_ADDRESS_P (symbol))
5967 desc = SYMBOL_REF_CONSTANT (symbol);
5968 alignment = desc->align;
5969 size = GET_MODE_SIZE (desc->mode);
5971 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
5973 decl = SYMBOL_REF_DECL (symbol);
5974 alignment = get_constant_alignment (decl);
5975 size = get_constant_size (decl);
5979 decl = SYMBOL_REF_DECL (symbol);
5980 alignment = DECL_ALIGN (decl);
5981 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
5984 /* Calculate the object's offset from the start of the block. */
5985 block = SYMBOL_REF_BLOCK (symbol);
5986 mask = alignment / BITS_PER_UNIT - 1;
5987 offset = (block->size + mask) & ~mask;
5988 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
5990 /* Record the block's new alignment and size. */
5991 block->alignment = MAX (block->alignment, alignment);
5992 block->size = offset + size;
5994 VEC_safe_push (rtx, gc, block->objects, symbol);
5997 /* Return the anchor that should be used to address byte offset OFFSET
5998 from the first object in BLOCK. MODEL is the TLS model used
6002 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
6003 enum tls_model model)
6006 unsigned int begin, middle, end;
6007 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
6010 /* Work out the anchor's offset. Use an offset of 0 for the first
6011 anchor so that we don't pessimize the case where we take the address
6012 of a variable at the beginning of the block. This is particularly
6013 useful when a block has only one variable assigned to it.
6015 We try to place anchors RANGE bytes apart, so there can then be
6016 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6017 a ptr_mode offset. With some target settings, the lowest such
6018 anchor might be out of range for the lowest ptr_mode offset;
6019 likewise the highest anchor for the highest offset. Use anchors
6020 at the extreme ends of the ptr_mode range in such cases.
6022 All arithmetic uses unsigned integers in order to avoid
6024 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
6025 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
6026 range = max_offset - min_offset + 1;
6031 bias = 1 << (GET_MODE_BITSIZE (ptr_mode) - 1);
6034 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
6035 delta -= delta % range;
6038 offset = (HOST_WIDE_INT) (-delta);
6042 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
6043 delta -= delta % range;
6044 if (delta > bias - 1)
6046 offset = (HOST_WIDE_INT) delta;
6050 /* Do a binary search to see if there's already an anchor we can use.
6051 Set BEGIN to the new anchor's index if not. */
6053 end = VEC_length (rtx, block->anchors);
6054 while (begin != end)
6056 middle = (end + begin) / 2;
6057 anchor = VEC_index (rtx, block->anchors, middle);
6058 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
6060 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
6062 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
6064 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
6070 /* Create a new anchor with a unique label. */
6071 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
6072 anchor = create_block_symbol (ggc_strdup (label), block, offset);
6073 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
6074 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
6076 /* Insert it at index BEGIN. */
6077 VEC_safe_insert (rtx, gc, block->anchors, begin, anchor);
6081 /* Output the objects in BLOCK. */
6084 output_object_block (struct object_block *block)
6086 struct constant_descriptor_rtx *desc;
6088 HOST_WIDE_INT offset;
6092 if (block->objects == NULL)
6095 /* Switch to the section and make sure that the first byte is
6096 suitably aligned. */
6097 switch_to_section (block->sect);
6098 assemble_align (block->alignment);
6100 /* Define the values of all anchors relative to the current section
6102 for (i = 0; VEC_iterate (rtx, block->anchors, i, symbol); i++)
6103 targetm.asm_out.output_anchor (symbol);
6105 /* Output the objects themselves. */
6107 for (i = 0; VEC_iterate (rtx, block->objects, i, symbol); i++)
6109 /* Move to the object's offset, padding with zeros if necessary. */
6110 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
6111 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
6112 if (CONSTANT_POOL_ADDRESS_P (symbol))
6114 desc = SYMBOL_REF_CONSTANT (symbol);
6115 output_constant_pool_1 (desc, 1);
6116 offset += GET_MODE_SIZE (desc->mode);
6118 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6120 decl = SYMBOL_REF_DECL (symbol);
6121 assemble_constant_contents (decl, XSTR (symbol, 0),
6122 get_constant_alignment (decl));
6123 offset += get_constant_size (decl);
6127 decl = SYMBOL_REF_DECL (symbol);
6128 assemble_variable_contents (decl, XSTR (symbol, 0), false);
6129 offset += tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6134 /* A htab_traverse callback used to call output_object_block for
6135 each member of object_block_htab. */
6138 output_object_block_htab (void **slot, void *data ATTRIBUTE_UNUSED)
6140 output_object_block ((struct object_block *) (*slot));
6144 /* Output the definitions of all object_blocks. */
6147 output_object_blocks (void)
6149 htab_traverse (object_block_htab, output_object_block_htab, NULL);
6152 #include "gt-varasm.h"