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 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2578 return tree_int_cst_equal (t1, t2);
2581 /* Real constants are the same only if the same width of type. */
2582 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2585 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
2588 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2591 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
2592 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
2593 TREE_STRING_LENGTH (t1)));
2596 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
2597 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
2601 VEC(constructor_elt, gc) *v1, *v2;
2602 unsigned HOST_WIDE_INT idx;
2604 typecode = TREE_CODE (TREE_TYPE (t1));
2605 if (typecode != TREE_CODE (TREE_TYPE (t2)))
2608 if (typecode == ARRAY_TYPE)
2610 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
2611 /* For arrays, check that the sizes all match. */
2612 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
2614 || size_1 != int_size_in_bytes (TREE_TYPE (t2)))
2619 /* For record and union constructors, require exact type
2621 if (TREE_TYPE (t1) != TREE_TYPE (t2))
2625 v1 = CONSTRUCTOR_ELTS (t1);
2626 v2 = CONSTRUCTOR_ELTS (t2);
2627 if (VEC_length (constructor_elt, v1)
2628 != VEC_length (constructor_elt, v2))
2631 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
2633 constructor_elt *c1 = VEC_index (constructor_elt, v1, idx);
2634 constructor_elt *c2 = VEC_index (constructor_elt, v2, idx);
2636 /* Check that each value is the same... */
2637 if (!compare_constant (c1->value, c2->value))
2639 /* ... and that they apply to the same fields! */
2640 if (typecode == ARRAY_TYPE)
2642 if (!compare_constant (c1->index, c2->index))
2647 if (c1->index != c2->index)
2658 struct addr_const value1, value2;
2660 decode_addr_const (t1, &value1);
2661 decode_addr_const (t2, &value2);
2662 return (value1.offset == value2.offset
2663 && strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
2669 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
2670 && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
2674 case NON_LVALUE_EXPR:
2675 case VIEW_CONVERT_EXPR:
2676 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
2681 nt1 = lang_hooks.expand_constant (t1);
2682 nt2 = lang_hooks.expand_constant (t2);
2683 if (nt1 != t1 || nt2 != t2)
2684 return compare_constant (nt1, nt2);
2693 /* Make a copy of the whole tree structure for a constant. This
2694 handles the same types of nodes that compare_constant handles. */
2697 copy_constant (tree exp)
2699 switch (TREE_CODE (exp))
2702 /* For ADDR_EXPR, we do not want to copy the decl whose address
2703 is requested. We do want to copy constants though. */
2704 if (CONSTANT_CLASS_P (TREE_OPERAND (exp, 0)))
2705 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2706 copy_constant (TREE_OPERAND (exp, 0)));
2708 return copy_node (exp);
2713 return copy_node (exp);
2716 return build_complex (TREE_TYPE (exp),
2717 copy_constant (TREE_REALPART (exp)),
2718 copy_constant (TREE_IMAGPART (exp)));
2722 return build2 (TREE_CODE (exp), TREE_TYPE (exp),
2723 copy_constant (TREE_OPERAND (exp, 0)),
2724 copy_constant (TREE_OPERAND (exp, 1)));
2728 case NON_LVALUE_EXPR:
2729 case VIEW_CONVERT_EXPR:
2730 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2731 copy_constant (TREE_OPERAND (exp, 0)));
2735 tree copy = copy_node (exp);
2736 VEC(constructor_elt, gc) *v;
2737 unsigned HOST_WIDE_INT idx;
2738 tree purpose, value;
2740 v = VEC_alloc(constructor_elt, gc, VEC_length(constructor_elt,
2741 CONSTRUCTOR_ELTS (exp)));
2742 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, purpose, value)
2744 constructor_elt *ce = VEC_quick_push (constructor_elt, v, NULL);
2745 ce->index = purpose;
2746 ce->value = copy_constant (value);
2748 CONSTRUCTOR_ELTS (copy) = v;
2754 tree t = lang_hooks.expand_constant (exp);
2756 gcc_assert (t == exp);
2757 return copy_constant (t);
2762 /* Return the alignment of constant EXP in bits. */
2765 get_constant_alignment (tree exp)
2769 align = TYPE_ALIGN (TREE_TYPE (exp));
2770 #ifdef CONSTANT_ALIGNMENT
2771 align = CONSTANT_ALIGNMENT (exp, align);
2776 /* Return the section into which constant EXP should be placed. */
2779 get_constant_section (tree exp)
2781 if (IN_NAMED_SECTION (exp))
2782 return get_named_section (exp, NULL, compute_reloc_for_constant (exp));
2784 return targetm.asm_out.select_section (exp,
2785 compute_reloc_for_constant (exp),
2786 get_constant_alignment (exp));
2789 /* Return the size of constant EXP in bytes. */
2791 static HOST_WIDE_INT
2792 get_constant_size (tree exp)
2796 size = int_size_in_bytes (TREE_TYPE (exp));
2797 if (TREE_CODE (exp) == STRING_CST)
2798 size = MAX (TREE_STRING_LENGTH (exp), size);
2802 /* Subroutine of output_constant_def:
2803 No constant equal to EXP is known to have been output.
2804 Make a constant descriptor to enter EXP in the hash table.
2805 Assign the label number and construct RTL to refer to the
2806 constant's location in memory.
2807 Caller is responsible for updating the hash table. */
2809 static struct constant_descriptor_tree *
2810 build_constant_desc (tree exp)
2816 struct constant_descriptor_tree *desc;
2818 desc = ggc_alloc (sizeof (*desc));
2819 desc->value = copy_constant (exp);
2821 /* Propagate marked-ness to copied constant. */
2822 if (flag_mudflap && mf_marked_p (exp))
2823 mf_mark (desc->value);
2825 /* Create a string containing the label name, in LABEL. */
2826 labelno = const_labelno++;
2827 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
2829 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
2830 if (use_object_blocks_p ())
2832 section *sect = get_constant_section (exp);
2833 symbol = create_block_symbol (ggc_strdup (label),
2834 get_block_for_section (sect), -1);
2837 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
2838 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
2839 SET_SYMBOL_REF_DECL (symbol, desc->value);
2840 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
2842 rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), symbol);
2843 set_mem_attributes (rtl, exp, 1);
2844 set_mem_alias_set (rtl, 0);
2845 set_mem_alias_set (rtl, const_alias_set);
2847 /* Set flags or add text to the name to record information, such as
2848 that it is a local symbol. If the name is changed, the macro
2849 ASM_OUTPUT_LABELREF will have to know how to strip this
2850 information. This call might invalidate our local variable
2851 SYMBOL; we can't use it afterward. */
2853 targetm.encode_section_info (exp, rtl, true);
2860 /* Return an rtx representing a reference to constant data in memory
2861 for the constant expression EXP.
2863 If assembler code for such a constant has already been output,
2864 return an rtx to refer to it.
2865 Otherwise, output such a constant in memory
2866 and generate an rtx for it.
2868 If DEFER is nonzero, this constant can be deferred and output only
2869 if referenced in the function after all optimizations.
2871 `const_desc_table' records which constants already have label strings. */
2874 output_constant_def (tree exp, int defer)
2876 struct constant_descriptor_tree *desc;
2877 struct constant_descriptor_tree key;
2880 /* Look up EXP in the table of constant descriptors. If we didn't find
2881 it, create a new one. */
2883 key.hash = const_hash_1 (exp);
2884 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
2889 desc = build_constant_desc (exp);
2890 desc->hash = key.hash;
2894 maybe_output_constant_def_contents (desc, defer);
2898 /* Subroutine of output_constant_def: Decide whether or not we need to
2899 output the constant DESC now, and if so, do it. */
2901 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
2904 rtx symbol = XEXP (desc->rtl, 0);
2905 tree exp = desc->value;
2907 if (flag_syntax_only)
2910 if (TREE_ASM_WRITTEN (exp))
2911 /* Already output; don't do it again. */
2914 /* We can always defer constants as long as the context allows
2918 /* Increment n_deferred_constants if it exists. It needs to be at
2919 least as large as the number of constants actually referred to
2920 by the function. If it's too small we'll stop looking too early
2921 and fail to emit constants; if it's too large we'll only look
2922 through the entire function when we could have stopped earlier. */
2924 n_deferred_constants++;
2928 output_constant_def_contents (symbol);
2931 /* Subroutine of output_constant_def_contents. Output the definition
2932 of constant EXP, which is pointed to by label LABEL. ALIGN is the
2933 constant's alignment in bits. */
2936 assemble_constant_contents (tree exp, const char *label, unsigned int align)
2940 size = get_constant_size (exp);
2942 /* Do any machine/system dependent processing of the constant. */
2943 #ifdef ASM_DECLARE_CONSTANT_NAME
2944 ASM_DECLARE_CONSTANT_NAME (asm_out_file, label, exp, size);
2946 /* Standard thing is just output label for the constant. */
2947 ASM_OUTPUT_LABEL (asm_out_file, label);
2948 #endif /* ASM_DECLARE_CONSTANT_NAME */
2950 /* Output the value of EXP. */
2951 output_constant (exp, size, align);
2954 /* We must output the constant data referred to by SYMBOL; do so. */
2957 output_constant_def_contents (rtx symbol)
2959 tree exp = SYMBOL_REF_DECL (symbol);
2962 /* Make sure any other constants whose addresses appear in EXP
2963 are assigned label numbers. */
2964 output_addressed_constants (exp);
2966 /* We are no longer deferring this constant. */
2967 TREE_ASM_WRITTEN (exp) = 1;
2969 /* If the constant is part of an object block, make sure that the
2970 decl has been positioned within its block, but do not write out
2971 its definition yet. output_object_blocks will do that later. */
2972 if (SYMBOL_REF_IN_BLOCK_P (symbol))
2973 place_block_symbol (symbol);
2976 switch_to_section (get_constant_section (exp));
2977 align = get_constant_alignment (exp);
2978 if (align > BITS_PER_UNIT)
2979 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
2980 assemble_constant_contents (exp, XSTR (symbol, 0), align);
2983 mudflap_enqueue_constant (exp);
2986 /* Look up EXP in the table of constant descriptors. Return the rtl
2987 if it has been emitted, else null. */
2990 lookup_constant_def (tree exp)
2992 struct constant_descriptor_tree *desc;
2993 struct constant_descriptor_tree key;
2996 key.hash = const_hash_1 (exp);
2997 desc = htab_find_with_hash (const_desc_htab, &key, key.hash);
2999 return (desc ? desc->rtl : NULL_RTX);
3002 /* Used in the hash tables to avoid outputting the same constant
3003 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3004 are output once per function, not once per file. */
3005 /* ??? Only a few targets need per-function constant pools. Most
3006 can use one per-file pool. Should add a targetm bit to tell the
3009 struct rtx_constant_pool GTY(())
3011 /* Pointers to first and last constant in pool, as ordered by offset. */
3012 struct constant_descriptor_rtx *first;
3013 struct constant_descriptor_rtx *last;
3015 /* Hash facility for making memory-constants from constant rtl-expressions.
3016 It is used on RISC machines where immediate integer arguments and
3017 constant addresses are restricted so that such constants must be stored
3019 htab_t GTY((param_is (struct constant_descriptor_rtx))) const_rtx_htab;
3021 /* Current offset in constant pool (does not include any
3022 machine-specific header). */
3023 HOST_WIDE_INT offset;
3026 struct constant_descriptor_rtx GTY((chain_next ("%h.next")))
3028 struct constant_descriptor_rtx *next;
3032 HOST_WIDE_INT offset;
3034 enum machine_mode mode;
3040 /* Hash and compare functions for const_rtx_htab. */
3043 const_desc_rtx_hash (const void *ptr)
3045 const struct constant_descriptor_rtx *desc = ptr;
3050 const_desc_rtx_eq (const void *a, const void *b)
3052 const struct constant_descriptor_rtx *x = a;
3053 const struct constant_descriptor_rtx *y = b;
3055 if (x->mode != y->mode)
3057 return rtx_equal_p (x->constant, y->constant);
3060 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3063 const_rtx_hash_1 (rtx *xp, void *data)
3065 unsigned HOST_WIDE_INT hwi;
3066 enum machine_mode mode;
3072 code = GET_CODE (x);
3073 mode = GET_MODE (x);
3074 h = (hashval_t) code * 1048573 + mode;
3082 const int shift = sizeof (hashval_t) * CHAR_BIT;
3083 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3086 h ^= (hashval_t) hwi;
3087 for (i = 1; i < n; ++i)
3090 h ^= (hashval_t) hwi;
3096 if (mode == VOIDmode)
3098 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3102 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3108 for (i = XVECLEN (x, 0); i-- > 0; )
3109 h = h * 251 + const_rtx_hash_1 (&XVECEXP (x, 0, i), data);
3114 h ^= htab_hash_string (XSTR (x, 0));
3118 h = h * 251 + CODE_LABEL_NUMBER (XEXP (x, 0));
3122 case UNSPEC_VOLATILE:
3123 h = h * 251 + XINT (x, 1);
3131 *hp = *hp * 509 + h;
3135 /* Compute a hash value for X, which should be a constant. */
3138 const_rtx_hash (rtx x)
3141 for_each_rtx (&x, const_rtx_hash_1, &h);
3146 /* Initialize constant pool hashing for a new function. */
3149 init_varasm_status (struct function *f)
3151 struct varasm_status *p;
3152 struct rtx_constant_pool *pool;
3154 p = ggc_alloc (sizeof (struct varasm_status));
3157 pool = ggc_alloc (sizeof (struct rtx_constant_pool));
3159 p->deferred_constants = 0;
3161 pool->const_rtx_htab = htab_create_ggc (31, const_desc_rtx_hash,
3162 const_desc_rtx_eq, NULL);
3163 pool->first = pool->last = NULL;
3167 /* Given a MINUS expression, simplify it if both sides
3168 include the same symbol. */
3171 simplify_subtraction (rtx x)
3173 rtx r = simplify_rtx (x);
3177 /* Given a constant rtx X, make (or find) a memory constant for its value
3178 and return a MEM rtx to refer to it in memory. */
3181 force_const_mem (enum machine_mode mode, rtx x)
3183 struct constant_descriptor_rtx *desc, tmp;
3184 struct rtx_constant_pool *pool = cfun->varasm->pool;
3191 /* If we're not allowed to drop X into the constant pool, don't. */
3192 if (targetm.cannot_force_const_mem (x))
3195 /* Lookup the value in the hashtable. */
3198 hash = const_rtx_hash (x);
3199 slot = htab_find_slot_with_hash (pool->const_rtx_htab, &tmp, hash, INSERT);
3202 /* If the constant was already present, return its memory. */
3204 return copy_rtx (desc->mem);
3206 /* Otherwise, create a new descriptor. */
3207 desc = ggc_alloc (sizeof (*desc));
3210 /* Align the location counter as required by EXP's data type. */
3211 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3212 #ifdef CONSTANT_ALIGNMENT
3214 tree type = lang_hooks.types.type_for_mode (mode, 0);
3215 if (type != NULL_TREE)
3216 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3220 pool->offset += (align / BITS_PER_UNIT) - 1;
3221 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3224 desc->constant = tmp.constant;
3225 desc->offset = pool->offset;
3228 desc->align = align;
3229 desc->labelno = const_labelno;
3232 pool->offset += GET_MODE_SIZE (mode);
3234 pool->last->next = desc;
3236 pool->first = pool->last = desc;
3239 /* Create a string containing the label name, in LABEL. */
3240 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3243 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3244 the constants pool. */
3245 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3247 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3248 symbol = create_block_symbol (ggc_strdup (label),
3249 get_block_for_section (sect), -1);
3252 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3254 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3255 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3256 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3257 current_function_uses_const_pool = 1;
3259 /* Construct the MEM. */
3260 desc->mem = def = gen_const_mem (mode, symbol);
3261 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3262 set_mem_align (def, align);
3264 /* If we're dropping a label to the constant pool, make sure we
3266 if (GET_CODE (x) == LABEL_REF)
3267 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3269 return copy_rtx (def);
3272 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3275 get_pool_constant (rtx addr)
3277 return SYMBOL_REF_CONSTANT (addr)->constant;
3280 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3281 and whether it has been output or not. */
3284 get_pool_constant_mark (rtx addr, bool *pmarked)
3286 struct constant_descriptor_rtx *desc;
3288 desc = SYMBOL_REF_CONSTANT (addr);
3289 *pmarked = (desc->mark != 0);
3290 return desc->constant;
3293 /* Similar, return the mode. */
3296 get_pool_mode (rtx addr)
3298 return SYMBOL_REF_CONSTANT (addr)->mode;
3301 /* Return the size of the constant pool. */
3304 get_pool_size (void)
3306 return cfun->varasm->pool->offset;
3309 /* Worker function for output_constant_pool_1. Emit assembly for X
3310 in MODE with known alignment ALIGN. */
3313 output_constant_pool_2 (enum machine_mode mode, rtx x, unsigned int align)
3315 switch (GET_MODE_CLASS (mode))
3318 case MODE_DECIMAL_FLOAT:
3322 gcc_assert (GET_CODE (x) == CONST_DOUBLE);
3323 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
3324 assemble_real (r, mode, align);
3329 case MODE_PARTIAL_INT:
3330 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3333 case MODE_VECTOR_FLOAT:
3334 case MODE_VECTOR_INT:
3337 enum machine_mode submode = GET_MODE_INNER (mode);
3338 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3340 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3341 units = CONST_VECTOR_NUNITS (x);
3343 for (i = 0; i < units; i++)
3345 rtx elt = CONST_VECTOR_ELT (x, i);
3346 output_constant_pool_2 (submode, elt, i ? subalign : align);
3356 /* Worker function for output_constant_pool. Emit constant DESC,
3357 giving it ALIGN bits of alignment. */
3360 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3367 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3368 whose CODE_LABEL has been deleted. This can occur if a jump table
3369 is eliminated by optimization. If so, write a constant of zero
3370 instead. Note that this can also happen by turning the
3371 CODE_LABEL into a NOTE. */
3372 /* ??? This seems completely and utterly wrong. Certainly it's
3373 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3374 functioning even with INSN_DELETED_P and friends. */
3377 switch (GET_CODE (x))
3380 if (GET_CODE (XEXP (x, 0)) != PLUS
3381 || GET_CODE (XEXP (XEXP (x, 0), 0)) != LABEL_REF)
3383 tmp = XEXP (XEXP (x, 0), 0);
3388 gcc_assert (!INSN_DELETED_P (tmp));
3389 gcc_assert (!NOTE_P (tmp)
3390 || NOTE_LINE_NUMBER (tmp) != NOTE_INSN_DELETED);
3397 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3398 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3399 align, desc->labelno, done);
3402 assemble_align (align);
3404 /* Output the label. */
3405 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3407 /* Output the data. */
3408 output_constant_pool_2 (desc->mode, x, align);
3410 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3411 sections have proper size. */
3412 if (align > GET_MODE_BITSIZE (desc->mode)
3414 && (in_section->common.flags & SECTION_MERGE))
3415 assemble_align (align);
3417 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3423 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3424 to as used. Emit referenced deferred strings. This function can
3425 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3428 mark_constant (rtx *current_rtx, void *data)
3430 struct rtx_constant_pool *pool = data;
3431 rtx x = *current_rtx;
3433 if (x == NULL_RTX || GET_CODE (x) != SYMBOL_REF)
3436 if (CONSTANT_POOL_ADDRESS_P (x))
3438 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3439 if (desc->mark == 0)
3442 for_each_rtx (&desc->constant, mark_constant, pool);
3445 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3447 tree exp = SYMBOL_REF_DECL (x);
3448 if (!TREE_ASM_WRITTEN (exp))
3450 n_deferred_constants--;
3451 output_constant_def_contents (x);
3458 /* Look through appropriate parts of INSN, marking all entries in the
3459 constant pool which are actually being used. Entries that are only
3460 referenced by other constants are also marked as used. Emit
3461 deferred strings that are used. */
3464 mark_constants (struct rtx_constant_pool *pool, rtx insn)
3469 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3470 insns, not any notes that may be attached. We don't want to mark
3471 a constant just because it happens to appear in a REG_EQUIV note. */
3472 if (GET_CODE (PATTERN (insn)) == SEQUENCE)
3474 rtx seq = PATTERN (insn);
3475 int i, n = XVECLEN (seq, 0);
3476 for (i = 0; i < n; ++i)
3478 rtx subinsn = XVECEXP (seq, 0, i);
3479 if (INSN_P (subinsn))
3480 for_each_rtx (&PATTERN (subinsn), mark_constant, pool);
3484 for_each_rtx (&PATTERN (insn), mark_constant, pool);
3487 /* Look through the instructions for this function, and mark all the
3488 entries in POOL which are actually being used. Emit deferred constants
3489 which have indeed been used. */
3492 mark_constant_pool (struct rtx_constant_pool *pool)
3496 if (pool->first == 0 && n_deferred_constants == 0)
3499 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3500 mark_constants (pool, insn);
3502 for (link = current_function_epilogue_delay_list;
3504 link = XEXP (link, 1))
3505 mark_constants (pool, XEXP (link, 0));
3508 /* Write all the constants in the constant pool. */
3511 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
3512 tree fndecl ATTRIBUTE_UNUSED)
3514 struct rtx_constant_pool *pool = cfun->varasm->pool;
3515 struct constant_descriptor_rtx *desc;
3517 /* It is possible for gcc to call force_const_mem and then to later
3518 discard the instructions which refer to the constant. In such a
3519 case we do not need to output the constant. */
3520 mark_constant_pool (pool);
3522 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3523 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
3526 for (desc = pool->first; desc ; desc = desc->next)
3529 /* If the constant is part of an object_block, make sure that
3530 the constant has been positioned within its block, but do not
3531 write out its definition yet. output_object_blocks will do
3533 if (SYMBOL_REF_IN_BLOCK_P (desc->sym))
3534 place_block_symbol (desc->sym);
3537 switch_to_section (targetm.asm_out.select_rtx_section
3538 (desc->mode, desc->constant, desc->align));
3539 output_constant_pool_1 (desc, desc->align);
3543 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3544 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
3548 /* Determine what kind of relocations EXP may need. */
3551 compute_reloc_for_constant (tree exp)
3553 int reloc = 0, reloc2;
3556 /* Give the front-end a chance to convert VALUE to something that
3557 looks more like a constant to the back-end. */
3558 exp = lang_hooks.expand_constant (exp);
3560 switch (TREE_CODE (exp))
3564 /* Go inside any operations that get_inner_reference can handle and see
3565 if what's inside is a constant: no need to do anything here for
3566 addresses of variables or functions. */
3567 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3568 tem = TREE_OPERAND (tem, 0))
3571 if (TREE_PUBLIC (tem))
3578 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3579 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3583 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3584 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3585 /* The difference of two local labels is computable at link time. */
3586 if (reloc == 1 && reloc2 == 1)
3594 case NON_LVALUE_EXPR:
3595 case VIEW_CONVERT_EXPR:
3596 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3601 unsigned HOST_WIDE_INT idx;
3602 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3604 reloc |= compute_reloc_for_constant (tem);
3614 /* Find all the constants whose addresses are referenced inside of EXP,
3615 and make sure assembler code with a label has been output for each one.
3616 Indicate whether an ADDR_EXPR has been encountered. */
3619 output_addressed_constants (tree exp)
3623 /* Give the front-end a chance to convert VALUE to something that
3624 looks more like a constant to the back-end. */
3625 exp = lang_hooks.expand_constant (exp);
3627 switch (TREE_CODE (exp))
3631 /* Go inside any operations that get_inner_reference can handle and see
3632 if what's inside is a constant: no need to do anything here for
3633 addresses of variables or functions. */
3634 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3635 tem = TREE_OPERAND (tem, 0))
3638 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3639 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
3640 tem = DECL_INITIAL (tem);
3642 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
3643 output_constant_def (tem, 0);
3648 output_addressed_constants (TREE_OPERAND (exp, 1));
3653 case NON_LVALUE_EXPR:
3654 case VIEW_CONVERT_EXPR:
3655 output_addressed_constants (TREE_OPERAND (exp, 0));
3660 unsigned HOST_WIDE_INT idx;
3661 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3663 output_addressed_constants (tem);
3672 /* Return nonzero if VALUE is a valid constant-valued expression
3673 for use in initializing a static variable; one that can be an
3674 element of a "constant" initializer.
3676 Return null_pointer_node if the value is absolute;
3677 if it is relocatable, return the variable that determines the relocation.
3678 We assume that VALUE has been folded as much as possible;
3679 therefore, we do not need to check for such things as
3680 arithmetic-combinations of integers. */
3683 initializer_constant_valid_p (tree value, tree endtype)
3685 /* Give the front-end a chance to convert VALUE to something that
3686 looks more like a constant to the back-end. */
3687 value = lang_hooks.expand_constant (value);
3689 switch (TREE_CODE (value))
3692 if ((TREE_CODE (TREE_TYPE (value)) == UNION_TYPE
3693 || TREE_CODE (TREE_TYPE (value)) == RECORD_TYPE)
3694 && TREE_CONSTANT (value)
3695 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (value)))
3697 unsigned HOST_WIDE_INT idx;
3699 bool absolute = true;
3701 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
3704 reloc = initializer_constant_valid_p (elt, TREE_TYPE (elt));
3707 if (reloc != null_pointer_node)
3710 /* For a non-absolute relocation, there is no single
3711 variable that can be "the variable that determines the
3713 return absolute ? null_pointer_node : error_mark_node;
3716 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
3723 return null_pointer_node;
3727 value = staticp (TREE_OPERAND (value, 0));
3730 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out to
3731 be a constant, this is old-skool offsetof-like nonsense. */
3732 if (TREE_CODE (value) == INDIRECT_REF
3733 && TREE_CONSTANT (TREE_OPERAND (value, 0)))
3734 return null_pointer_node;
3735 /* Taking the address of a nested function involves a trampoline. */
3736 if (TREE_CODE (value) == FUNCTION_DECL
3737 && ((decl_function_context (value)
3738 && !DECL_NO_STATIC_CHAIN (value))
3739 || DECL_DLLIMPORT_P (value)))
3741 /* "&{...}" requires a temporary to hold the constructed
3743 if (TREE_CODE (value) == CONSTRUCTOR)
3748 case VIEW_CONVERT_EXPR:
3749 case NON_LVALUE_EXPR:
3750 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
3759 src = TREE_OPERAND (value, 0);
3760 src_type = TREE_TYPE (src);
3761 dest_type = TREE_TYPE (value);
3763 /* Allow conversions between pointer types, floating-point
3764 types, and offset types. */
3765 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
3766 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
3767 || (TREE_CODE (dest_type) == OFFSET_TYPE
3768 && TREE_CODE (src_type) == OFFSET_TYPE))
3769 return initializer_constant_valid_p (src, endtype);
3771 /* Allow length-preserving conversions between integer types. */
3772 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
3773 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
3774 return initializer_constant_valid_p (src, endtype);
3776 /* Allow conversions between other integer types only if
3778 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
3780 tree inner = initializer_constant_valid_p (src, endtype);
3781 if (inner == null_pointer_node)
3782 return null_pointer_node;
3786 /* Allow (int) &foo provided int is as wide as a pointer. */
3787 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
3788 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
3789 return initializer_constant_valid_p (src, endtype);
3791 /* Likewise conversions from int to pointers, but also allow
3792 conversions from 0. */
3793 if ((POINTER_TYPE_P (dest_type)
3794 || TREE_CODE (dest_type) == OFFSET_TYPE)
3795 && INTEGRAL_TYPE_P (src_type))
3797 if (TREE_CODE (src) == INTEGER_CST
3798 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
3799 return null_pointer_node;
3800 if (integer_zerop (src))
3801 return null_pointer_node;
3802 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
3803 return initializer_constant_valid_p (src, endtype);
3806 /* Allow conversions to struct or union types if the value
3808 if (TREE_CODE (dest_type) == RECORD_TYPE
3809 || TREE_CODE (dest_type) == UNION_TYPE)
3810 return initializer_constant_valid_p (src, endtype);
3815 if (! INTEGRAL_TYPE_P (endtype)
3816 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
3818 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
3820 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
3822 /* If either term is absolute, use the other terms relocation. */
3823 if (valid0 == null_pointer_node)
3825 if (valid1 == null_pointer_node)
3831 if (! INTEGRAL_TYPE_P (endtype)
3832 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
3834 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
3836 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
3838 /* Win if second argument is absolute. */
3839 if (valid1 == null_pointer_node)
3841 /* Win if both arguments have the same relocation.
3842 Then the value is absolute. */
3843 if (valid0 == valid1 && valid0 != 0)
3844 return null_pointer_node;
3846 /* Since GCC guarantees that string constants are unique in the
3847 generated code, a subtraction between two copies of the same
3848 constant string is absolute. */
3849 if (valid0 && TREE_CODE (valid0) == STRING_CST
3850 && valid1 && TREE_CODE (valid1) == STRING_CST
3851 && operand_equal_p (valid0, valid1, 1))
3852 return null_pointer_node;
3855 /* Support narrowing differences. */
3856 if (INTEGRAL_TYPE_P (endtype))
3860 op0 = TREE_OPERAND (value, 0);
3861 op1 = TREE_OPERAND (value, 1);
3863 /* Like STRIP_NOPS except allow the operand mode to widen.
3864 This works around a feature of fold that simplifies
3865 (int)(p1 - p2) to ((int)p1 - (int)p2) under the theory
3866 that the narrower operation is cheaper. */
3868 while (TREE_CODE (op0) == NOP_EXPR
3869 || TREE_CODE (op0) == CONVERT_EXPR
3870 || TREE_CODE (op0) == NON_LVALUE_EXPR)
3872 tree inner = TREE_OPERAND (op0, 0);
3873 if (inner == error_mark_node
3874 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
3875 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
3876 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
3881 while (TREE_CODE (op1) == NOP_EXPR
3882 || TREE_CODE (op1) == CONVERT_EXPR
3883 || TREE_CODE (op1) == NON_LVALUE_EXPR)
3885 tree inner = TREE_OPERAND (op1, 0);
3886 if (inner == error_mark_node
3887 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
3888 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
3889 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
3894 op0 = initializer_constant_valid_p (op0, endtype);
3895 op1 = initializer_constant_valid_p (op1, endtype);
3897 /* Both initializers must be known. */
3901 return null_pointer_node;
3903 /* Support differences between labels. */
3904 if (TREE_CODE (op0) == LABEL_DECL
3905 && TREE_CODE (op1) == LABEL_DECL)
3906 return null_pointer_node;
3908 if (TREE_CODE (op0) == STRING_CST
3909 && TREE_CODE (op1) == STRING_CST
3910 && operand_equal_p (op0, op1, 1))
3911 return null_pointer_node;
3923 /* Output assembler code for constant EXP to FILE, with no label.
3924 This includes the pseudo-op such as ".int" or ".byte", and a newline.
3925 Assumes output_addressed_constants has been done on EXP already.
3927 Generate exactly SIZE bytes of assembler data, padding at the end
3928 with zeros if necessary. SIZE must always be specified.
3930 SIZE is important for structure constructors,
3931 since trailing members may have been omitted from the constructor.
3932 It is also important for initialization of arrays from string constants
3933 since the full length of the string constant might not be wanted.
3934 It is also needed for initialization of unions, where the initializer's
3935 type is just one member, and that may not be as long as the union.
3937 There a case in which we would fail to output exactly SIZE bytes:
3938 for a structure constructor that wants to produce more than SIZE bytes.
3939 But such constructors will never be generated for any possible input.
3941 ALIGN is the alignment of the data in bits. */
3944 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
3946 enum tree_code code;
3947 unsigned HOST_WIDE_INT thissize;
3949 /* Some front-ends use constants other than the standard language-independent
3950 varieties, but which may still be output directly. Give the front-end a
3951 chance to convert EXP to a language-independent representation. */
3952 exp = lang_hooks.expand_constant (exp);
3954 if (size == 0 || flag_syntax_only)
3957 /* See if we're trying to initialize a pointer in a non-default mode
3958 to the address of some declaration somewhere. If the target says
3959 the mode is valid for pointers, assume the target has a way of
3961 if (TREE_CODE (exp) == NOP_EXPR
3962 && POINTER_TYPE_P (TREE_TYPE (exp))
3963 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
3965 tree saved_type = TREE_TYPE (exp);
3967 /* Peel off any intermediate conversions-to-pointer for valid
3969 while (TREE_CODE (exp) == NOP_EXPR
3970 && POINTER_TYPE_P (TREE_TYPE (exp))
3971 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
3972 exp = TREE_OPERAND (exp, 0);
3974 /* If what we're left with is the address of something, we can
3975 convert the address to the final type and output it that
3977 if (TREE_CODE (exp) == ADDR_EXPR)
3978 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
3979 /* Likewise for constant ints. */
3980 else if (TREE_CODE (exp) == INTEGER_CST)
3981 exp = build_int_cst_wide (saved_type, TREE_INT_CST_LOW (exp),
3982 TREE_INT_CST_HIGH (exp));
3986 /* Eliminate any conversions since we'll be outputting the underlying
3988 while (TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
3989 || TREE_CODE (exp) == NON_LVALUE_EXPR
3990 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
3992 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
3993 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
3995 /* Make sure eliminating the conversion is really a no-op, except with
3996 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
3997 union types to allow for Ada unchecked unions. */
3998 if (type_size > op_size
3999 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
4000 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
4001 internal_error ("no-op convert from %wd to %wd bytes in initializer",
4002 op_size, type_size);
4004 exp = TREE_OPERAND (exp, 0);
4007 code = TREE_CODE (TREE_TYPE (exp));
4008 thissize = int_size_in_bytes (TREE_TYPE (exp));
4010 /* Allow a constructor with no elements for any data type.
4011 This means to fill the space with zeros. */
4012 if (TREE_CODE (exp) == CONSTRUCTOR
4013 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (exp)))
4015 assemble_zeros (size);
4019 if (TREE_CODE (exp) == FDESC_EXPR)
4021 #ifdef ASM_OUTPUT_FDESC
4022 HOST_WIDE_INT part = tree_low_cst (TREE_OPERAND (exp, 1), 0);
4023 tree decl = TREE_OPERAND (exp, 0);
4024 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4031 /* Now output the underlying data. If we've handling the padding, return.
4032 Otherwise, break and ensure SIZE is the size written. */
4039 case REFERENCE_TYPE:
4041 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
4042 EXPAND_INITIALIZER),
4043 MIN (size, thissize), align, 0))
4044 error ("initializer for integer value is too complicated");
4048 if (TREE_CODE (exp) != REAL_CST)
4049 error ("initializer for floating value is not a floating constant");
4051 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)), align);
4055 output_constant (TREE_REALPART (exp), thissize / 2, align);
4056 output_constant (TREE_IMAGPART (exp), thissize / 2,
4057 min_align (align, BITS_PER_UNIT * (thissize / 2)));
4062 switch (TREE_CODE (exp))
4065 output_constructor (exp, size, align);
4068 thissize = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp),
4070 assemble_string (TREE_STRING_POINTER (exp), thissize);
4077 unsigned int nalign;
4078 enum machine_mode inner;
4080 inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4081 nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4083 elt_size = GET_MODE_SIZE (inner);
4085 link = TREE_VECTOR_CST_ELTS (exp);
4086 output_constant (TREE_VALUE (link), elt_size, align);
4087 while ((link = TREE_CHAIN (link)) != NULL)
4088 output_constant (TREE_VALUE (link), elt_size, nalign);
4098 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4099 output_constructor (exp, size, align);
4109 if (size > thissize)
4110 assemble_zeros (size - thissize);
4114 /* Subroutine of output_constructor, used for computing the size of
4115 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4116 type with an unspecified upper bound. */
4118 static unsigned HOST_WIDE_INT
4119 array_size_for_constructor (tree val)
4122 unsigned HOST_WIDE_INT cnt;
4125 /* This code used to attempt to handle string constants that are not
4126 arrays of single-bytes, but nothing else does, so there's no point in
4128 if (TREE_CODE (val) == STRING_CST)
4129 return TREE_STRING_LENGTH (val);
4131 max_index = NULL_TREE;
4132 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4134 if (TREE_CODE (index) == RANGE_EXPR)
4135 index = TREE_OPERAND (index, 1);
4136 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4140 if (max_index == NULL_TREE)
4143 /* Compute the total number of array elements. */
4144 i = size_binop (MINUS_EXPR, convert (sizetype, max_index),
4146 TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)))));
4147 i = size_binop (PLUS_EXPR, i, build_int_cst (sizetype, 1));
4149 /* Multiply by the array element unit size to find number of bytes. */
4150 i = size_binop (MULT_EXPR, i, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4152 return tree_low_cst (i, 1);
4155 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4156 Generate at least SIZE bytes, padding if necessary. */
4159 output_constructor (tree exp, unsigned HOST_WIDE_INT size,
4162 tree type = TREE_TYPE (exp);
4165 /* Number of bytes output or skipped so far.
4166 In other words, current position within the constructor. */
4167 HOST_WIDE_INT total_bytes = 0;
4168 /* Nonzero means BYTE contains part of a byte, to be output. */
4169 int byte_buffer_in_use = 0;
4171 unsigned HOST_WIDE_INT cnt;
4172 constructor_elt *ce;
4174 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
4176 if (TREE_CODE (type) == RECORD_TYPE)
4177 field = TYPE_FIELDS (type);
4179 if (TREE_CODE (type) == ARRAY_TYPE
4180 && TYPE_DOMAIN (type) != 0)
4181 min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (type));
4183 /* As LINK goes through the elements of the constant,
4184 FIELD goes through the structure fields, if the constant is a structure.
4185 if the constant is a union, then we override this,
4186 by getting the field from the TREE_LIST element.
4187 But the constant could also be an array. Then FIELD is zero.
4189 There is always a maximum of one element in the chain LINK for unions
4190 (even if the initializer in a source program incorrectly contains
4193 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), cnt, ce);
4194 cnt++, field = field ? TREE_CHAIN (field) : 0)
4196 tree val = ce->value;
4199 /* The element in a union constructor specifies the proper field
4201 if ((TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
4202 || TREE_CODE (type) == QUAL_UNION_TYPE)
4206 else if (TREE_CODE (type) == ARRAY_TYPE)
4209 #ifdef ASM_COMMENT_START
4210 if (field && flag_verbose_asm)
4211 fprintf (asm_out_file, "%s %s:\n",
4214 ? IDENTIFIER_POINTER (DECL_NAME (field))
4218 /* Eliminate the marker that makes a cast not be an lvalue. */
4222 if (index && TREE_CODE (index) == RANGE_EXPR)
4224 unsigned HOST_WIDE_INT fieldsize
4225 = int_size_in_bytes (TREE_TYPE (type));
4226 HOST_WIDE_INT lo_index = tree_low_cst (TREE_OPERAND (index, 0), 0);
4227 HOST_WIDE_INT hi_index = tree_low_cst (TREE_OPERAND (index, 1), 0);
4228 HOST_WIDE_INT index;
4229 unsigned int align2 = min_align (align, fieldsize * BITS_PER_UNIT);
4231 for (index = lo_index; index <= hi_index; index++)
4233 /* Output the element's initial value. */
4235 assemble_zeros (fieldsize);
4237 output_constant (val, fieldsize, align2);
4239 /* Count its size. */
4240 total_bytes += fieldsize;
4243 else if (field == 0 || !DECL_BIT_FIELD (field))
4245 /* An element that is not a bit-field. */
4247 unsigned HOST_WIDE_INT fieldsize;
4248 /* Since this structure is static,
4249 we know the positions are constant. */
4250 HOST_WIDE_INT pos = field ? int_byte_position (field) : 0;
4251 unsigned int align2;
4254 pos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val)), 1)
4255 * (tree_low_cst (index, 0) - tree_low_cst (min_index, 0)));
4257 /* Output any buffered-up bit-fields preceding this element. */
4258 if (byte_buffer_in_use)
4260 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4262 byte_buffer_in_use = 0;
4265 /* Advance to offset of this element.
4266 Note no alignment needed in an array, since that is guaranteed
4267 if each element has the proper size. */
4268 if ((field != 0 || index != 0) && pos != total_bytes)
4270 gcc_assert (pos >= total_bytes);
4271 assemble_zeros (pos - total_bytes);
4275 /* Find the alignment of this element. */
4276 align2 = min_align (align, BITS_PER_UNIT * pos);
4278 /* Determine size this element should occupy. */
4283 /* If this is an array with an unspecified upper bound,
4284 the initializer determines the size. */
4285 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4286 but we cannot do this until the deprecated support for
4287 initializing zero-length array members is removed. */
4288 if (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE
4289 && TYPE_DOMAIN (TREE_TYPE (field))
4290 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field))))
4292 fieldsize = array_size_for_constructor (val);
4293 /* Given a non-empty initialization, this field had
4295 gcc_assert (!fieldsize || !TREE_CHAIN (field));
4297 else if (DECL_SIZE_UNIT (field))
4299 /* ??? This can't be right. If the decl size overflows
4300 a host integer we will silently emit no data. */
4301 if (host_integerp (DECL_SIZE_UNIT (field), 1))
4302 fieldsize = tree_low_cst (DECL_SIZE_UNIT (field), 1);
4306 fieldsize = int_size_in_bytes (TREE_TYPE (type));
4308 /* Output the element's initial value. */
4310 assemble_zeros (fieldsize);
4312 output_constant (val, fieldsize, align2);
4314 /* Count its size. */
4315 total_bytes += fieldsize;
4317 else if (val != 0 && TREE_CODE (val) != INTEGER_CST)
4318 error ("invalid initial value for member %qs",
4319 IDENTIFIER_POINTER (DECL_NAME (field)));
4322 /* Element that is a bit-field. */
4324 HOST_WIDE_INT next_offset = int_bit_position (field);
4325 HOST_WIDE_INT end_offset
4326 = (next_offset + tree_low_cst (DECL_SIZE (field), 1));
4329 val = integer_zero_node;
4331 /* If this field does not start in this (or, next) byte,
4333 if (next_offset / BITS_PER_UNIT != total_bytes)
4335 /* Output remnant of any bit field in previous bytes. */
4336 if (byte_buffer_in_use)
4338 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4340 byte_buffer_in_use = 0;
4343 /* If still not at proper byte, advance to there. */
4344 if (next_offset / BITS_PER_UNIT != total_bytes)
4346 gcc_assert (next_offset / BITS_PER_UNIT >= total_bytes);
4347 assemble_zeros (next_offset / BITS_PER_UNIT - total_bytes);
4348 total_bytes = next_offset / BITS_PER_UNIT;
4352 if (! byte_buffer_in_use)
4355 /* We must split the element into pieces that fall within
4356 separate bytes, and combine each byte with previous or
4357 following bit-fields. */
4359 /* next_offset is the offset n fbits from the beginning of
4360 the structure to the next bit of this element to be processed.
4361 end_offset is the offset of the first bit past the end of
4363 while (next_offset < end_offset)
4367 HOST_WIDE_INT value;
4368 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
4369 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
4371 /* Advance from byte to byte
4372 within this element when necessary. */
4373 while (next_byte != total_bytes)
4375 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4380 /* Number of bits we can process at once
4381 (all part of the same byte). */
4382 this_time = MIN (end_offset - next_offset,
4383 BITS_PER_UNIT - next_bit);
4384 if (BYTES_BIG_ENDIAN)
4386 /* On big-endian machine, take the most significant bits
4387 first (of the bits that are significant)
4388 and put them into bytes from the most significant end. */
4389 shift = end_offset - next_offset - this_time;
4391 /* Don't try to take a bunch of bits that cross
4392 the word boundary in the INTEGER_CST. We can
4393 only select bits from the LOW or HIGH part
4395 if (shift < HOST_BITS_PER_WIDE_INT
4396 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4398 this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
4399 shift = HOST_BITS_PER_WIDE_INT;
4402 /* Now get the bits from the appropriate constant word. */
4403 if (shift < HOST_BITS_PER_WIDE_INT)
4404 value = TREE_INT_CST_LOW (val);
4407 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4408 value = TREE_INT_CST_HIGH (val);
4409 shift -= HOST_BITS_PER_WIDE_INT;
4412 /* Get the result. This works only when:
4413 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4414 byte |= (((value >> shift)
4415 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4416 << (BITS_PER_UNIT - this_time - next_bit));
4420 /* On little-endian machines,
4421 take first the least significant bits of the value
4422 and pack them starting at the least significant
4423 bits of the bytes. */
4424 shift = next_offset - int_bit_position (field);
4426 /* Don't try to take a bunch of bits that cross
4427 the word boundary in the INTEGER_CST. We can
4428 only select bits from the LOW or HIGH part
4430 if (shift < HOST_BITS_PER_WIDE_INT
4431 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4432 this_time = (HOST_BITS_PER_WIDE_INT - shift);
4434 /* Now get the bits from the appropriate constant word. */
4435 if (shift < HOST_BITS_PER_WIDE_INT)
4436 value = TREE_INT_CST_LOW (val);
4439 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4440 value = TREE_INT_CST_HIGH (val);
4441 shift -= HOST_BITS_PER_WIDE_INT;
4444 /* Get the result. This works only when:
4445 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4446 byte |= (((value >> shift)
4447 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4451 next_offset += this_time;
4452 byte_buffer_in_use = 1;
4457 if (byte_buffer_in_use)
4459 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4463 if ((unsigned HOST_WIDE_INT)total_bytes < size)
4464 assemble_zeros (size - total_bytes);
4467 /* This TREE_LIST contains any weak symbol declarations waiting
4469 static GTY(()) tree weak_decls;
4471 /* Mark DECL as weak. */
4474 mark_weak (tree decl)
4476 DECL_WEAK (decl) = 1;
4478 if (DECL_RTL_SET_P (decl)
4479 && MEM_P (DECL_RTL (decl))
4480 && XEXP (DECL_RTL (decl), 0)
4481 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
4482 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
4485 /* Merge weak status between NEWDECL and OLDDECL. */
4488 merge_weak (tree newdecl, tree olddecl)
4490 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
4492 if (DECL_WEAK (newdecl) && SUPPORTS_WEAK)
4495 /* We put the NEWDECL on the weak_decls list at some point
4496 and OLDDECL as well. Keep just OLDDECL on the list. */
4497 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
4498 if (TREE_VALUE (*pwd) == newdecl)
4500 *pwd = TREE_CHAIN (*pwd);
4507 if (DECL_WEAK (newdecl))
4511 /* NEWDECL is weak, but OLDDECL is not. */
4513 /* If we already output the OLDDECL, we're in trouble; we can't
4514 go back and make it weak. This error cannot caught in
4515 declare_weak because the NEWDECL and OLDDECL was not yet
4516 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4517 if (TREE_ASM_WRITTEN (olddecl))
4518 error ("weak declaration of %q+D must precede definition",
4521 /* If we've already generated rtl referencing OLDDECL, we may
4522 have done so in a way that will not function properly with
4524 else if (TREE_USED (olddecl)
4525 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)))
4526 warning (0, "weak declaration of %q+D after first use results "
4527 "in unspecified behavior", newdecl);
4531 /* We put the NEWDECL on the weak_decls list at some point.
4532 Replace it with the OLDDECL. */
4533 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
4534 if (TREE_VALUE (wd) == newdecl)
4536 TREE_VALUE (wd) = olddecl;
4539 /* We may not find the entry on the list. If NEWDECL is a
4540 weak alias, then we will have already called
4541 globalize_decl to remove the entry; in that case, we do
4542 not need to do anything. */
4545 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4546 mark_weak (olddecl);
4549 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4550 weak. Just update NEWDECL to indicate that it's weak too. */
4551 mark_weak (newdecl);
4554 /* Declare DECL to be a weak symbol. */
4557 declare_weak (tree decl)
4559 if (! TREE_PUBLIC (decl))
4560 error ("weak declaration of %q+D must be public", decl);
4561 else if (TREE_CODE (decl) == FUNCTION_DECL && TREE_ASM_WRITTEN (decl))
4562 error ("weak declaration of %q+D must precede definition", decl);
4563 else if (SUPPORTS_WEAK)
4565 if (! DECL_WEAK (decl))
4566 weak_decls = tree_cons (NULL, decl, weak_decls);
4569 warning (0, "weak declaration of %q+D not supported", decl);
4575 weak_finish_1 (tree decl)
4577 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
4578 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4581 if (! TREE_USED (decl))
4584 #ifdef ASM_WEAKEN_DECL
4585 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
4587 #ifdef ASM_WEAKEN_LABEL
4588 ASM_WEAKEN_LABEL (asm_out_file, name);
4590 #ifdef ASM_OUTPUT_WEAK_ALIAS
4592 static bool warn_once = 0;
4595 warning (0, "only weak aliases are supported in this configuration");
4605 /* This TREE_LIST contains weakref targets. */
4607 static GTY(()) tree weakref_targets;
4609 /* Forward declaration. */
4610 static tree find_decl_and_mark_needed (tree decl, tree target);
4612 /* Emit any pending weak declarations. */
4619 for (t = weakref_targets; t; t = TREE_CHAIN (t))
4621 tree alias_decl = TREE_PURPOSE (t);
4622 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
4624 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
4625 /* Remove alias_decl from the weak list, but leave entries for
4626 the target alone. */
4628 #ifndef ASM_OUTPUT_WEAKREF
4629 else if (! TREE_SYMBOL_REFERENCED (target))
4631 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
4632 defined, otherwise we and weak_finish_1 would use a
4633 different macros. */
4634 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
4635 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
4637 tree decl = find_decl_and_mark_needed (alias_decl, target);
4641 decl = build_decl (TREE_CODE (alias_decl), target,
4642 TREE_TYPE (alias_decl));
4644 DECL_EXTERNAL (decl) = 1;
4645 TREE_PUBLIC (decl) = 1;
4646 DECL_ARTIFICIAL (decl) = 1;
4647 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
4648 TREE_USED (decl) = 1;
4651 weak_finish_1 (decl);
4660 /* Remove the alias and the target from the pending weak list
4661 so that we do not emit any .weak directives for the former,
4662 nor multiple .weak directives for the latter. */
4663 for (p = &weak_decls; (t2 = *p) ; )
4665 if (TREE_VALUE (t2) == alias_decl
4666 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
4667 *p = TREE_CHAIN (t2);
4669 p = &TREE_CHAIN (t2);
4672 /* Remove other weakrefs to the same target, to speed things up. */
4673 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
4675 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
4676 *p = TREE_CHAIN (t2);
4678 p = &TREE_CHAIN (t2);
4683 for (t = weak_decls; t; t = TREE_CHAIN (t))
4685 tree decl = TREE_VALUE (t);
4687 weak_finish_1 (decl);
4691 /* Emit the assembly bits to indicate that DECL is globally visible. */
4694 globalize_decl (tree decl)
4696 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
4698 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
4699 if (DECL_WEAK (decl))
4703 #ifdef ASM_WEAKEN_DECL
4704 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
4706 ASM_WEAKEN_LABEL (asm_out_file, name);
4709 /* Remove this function from the pending weak list so that
4710 we do not emit multiple .weak directives for it. */
4711 for (p = &weak_decls; (t = *p) ; )
4713 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
4714 *p = TREE_CHAIN (t);
4716 p = &TREE_CHAIN (t);
4719 /* Remove weakrefs to the same target from the pending weakref
4720 list, for the same reason. */
4721 for (p = &weakref_targets; (t = *p) ; )
4723 if (DECL_ASSEMBLER_NAME (decl)
4724 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
4725 *p = TREE_CHAIN (t);
4727 p = &TREE_CHAIN (t);
4732 #elif defined(ASM_MAKE_LABEL_LINKONCE)
4733 if (DECL_ONE_ONLY (decl))
4734 ASM_MAKE_LABEL_LINKONCE (asm_out_file, name);
4737 targetm.asm_out.globalize_label (asm_out_file, name);
4740 /* We have to be able to tell cgraph about the needed-ness of the target
4741 of an alias. This requires that the decl have been defined. Aliases
4742 that precede their definition have to be queued for later processing. */
4744 typedef struct alias_pair GTY(())
4750 /* Define gc'd vector type. */
4751 DEF_VEC_O(alias_pair);
4752 DEF_VEC_ALLOC_O(alias_pair,gc);
4754 static GTY(()) VEC(alias_pair,gc) *alias_pairs;
4756 /* Given an assembly name, find the decl it is associated with. At the
4757 same time, mark it needed for cgraph. */
4760 find_decl_and_mark_needed (tree decl, tree target)
4762 struct cgraph_node *fnode = NULL;
4763 struct cgraph_varpool_node *vnode = NULL;
4765 if (TREE_CODE (decl) == FUNCTION_DECL)
4767 fnode = cgraph_node_for_asm (target);
4769 vnode = cgraph_varpool_node_for_asm (target);
4773 vnode = cgraph_varpool_node_for_asm (target);
4775 fnode = cgraph_node_for_asm (target);
4780 /* We can't mark function nodes as used after cgraph global info
4781 is finished. This wouldn't generally be necessary, but C++
4782 virtual table thunks are introduced late in the game and
4783 might seem like they need marking, although in fact they
4785 if (! cgraph_global_info_ready)
4786 cgraph_mark_needed_node (fnode);
4791 cgraph_varpool_mark_needed_node (vnode);
4798 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
4799 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
4800 tree node is DECL to have the value of the tree node TARGET. */
4803 do_assemble_alias (tree decl, tree target)
4805 if (TREE_ASM_WRITTEN (decl))
4808 TREE_ASM_WRITTEN (decl) = 1;
4809 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
4811 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
4813 ultimate_transparent_alias_target (&target);
4815 if (!TREE_SYMBOL_REFERENCED (target))
4816 weakref_targets = tree_cons (decl, target, weakref_targets);
4818 #ifdef ASM_OUTPUT_WEAKREF
4819 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
4820 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
4821 IDENTIFIER_POINTER (target));
4825 error ("%Jweakref is not supported in this configuration", decl);
4832 #ifdef ASM_OUTPUT_DEF
4833 /* Make name accessible from other files, if appropriate. */
4835 if (TREE_PUBLIC (decl))
4837 globalize_decl (decl);
4838 maybe_assemble_visibility (decl);
4841 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
4842 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
4844 ASM_OUTPUT_DEF (asm_out_file,
4845 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
4846 IDENTIFIER_POINTER (target));
4848 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
4853 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4854 # ifdef ASM_WEAKEN_DECL
4855 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
4857 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
4859 /* Remove this function from the pending weak list so that
4860 we do not emit multiple .weak directives for it. */
4861 for (p = &weak_decls; (t = *p) ; )
4862 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
4863 *p = TREE_CHAIN (t);
4865 p = &TREE_CHAIN (t);
4867 /* Remove weakrefs to the same target from the pending weakref
4868 list, for the same reason. */
4869 for (p = &weakref_targets; (t = *p) ; )
4871 if (DECL_ASSEMBLER_NAME (decl)
4872 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
4873 *p = TREE_CHAIN (t);
4875 p = &TREE_CHAIN (t);
4881 /* First pass of completing pending aliases. Make sure that cgraph knows
4882 which symbols will be required. */
4885 finish_aliases_1 (void)
4890 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
4894 target_decl = find_decl_and_mark_needed (p->decl, p->target);
4895 if (target_decl == NULL)
4897 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
4898 error ("%q+D aliased to undefined symbol %qs",
4899 p->decl, IDENTIFIER_POINTER (p->target));
4901 else if (DECL_EXTERNAL (target_decl)
4902 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
4903 error ("%q+D aliased to external symbol %qs",
4904 p->decl, IDENTIFIER_POINTER (p->target));
4908 /* Second pass of completing pending aliases. Emit the actual assembly.
4909 This happens at the end of compilation and thus it is assured that the
4910 target symbol has been emitted. */
4913 finish_aliases_2 (void)
4918 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
4919 do_assemble_alias (p->decl, p->target);
4921 VEC_truncate (alias_pair, alias_pairs, 0);
4924 /* Emit an assembler directive to make the symbol for DECL an alias to
4925 the symbol for TARGET. */
4928 assemble_alias (tree decl, tree target)
4931 bool is_weakref = false;
4933 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
4935 tree alias = DECL_ASSEMBLER_NAME (decl);
4939 ultimate_transparent_alias_target (&target);
4941 if (alias == target)
4942 error ("weakref %q+D ultimately targets itself", decl);
4945 #ifndef ASM_OUTPUT_WEAKREF
4946 IDENTIFIER_TRANSPARENT_ALIAS (alias) = 1;
4947 TREE_CHAIN (alias) = target;
4950 if (TREE_PUBLIC (decl))
4951 error ("weakref %q+D must have static linkage", decl);
4955 #if !defined (ASM_OUTPUT_DEF)
4956 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
4957 error ("%Jalias definitions not supported in this configuration", decl);
4960 if (!DECL_WEAK (decl))
4962 error ("%Jonly weak aliases are supported in this configuration", decl);
4969 /* We must force creation of DECL_RTL for debug info generation, even though
4970 we don't use it here. */
4971 make_decl_rtl (decl);
4972 TREE_USED (decl) = 1;
4974 /* A quirk of the initial implementation of aliases required that the user
4975 add "extern" to all of them. Which is silly, but now historical. Do
4976 note that the symbol is in fact locally defined. */
4978 DECL_EXTERNAL (decl) = 0;
4980 /* Allow aliases to aliases. */
4981 if (TREE_CODE (decl) == FUNCTION_DECL)
4982 cgraph_node (decl)->alias = true;
4984 cgraph_varpool_node (decl)->alias = true;
4986 /* If the target has already been emitted, we don't have to queue the
4987 alias. This saves a tad o memory. */
4988 target_decl = find_decl_and_mark_needed (decl, target);
4989 if (target_decl && TREE_ASM_WRITTEN (target_decl))
4990 do_assemble_alias (decl, target);
4993 alias_pair *p = VEC_safe_push (alias_pair, gc, alias_pairs, NULL);
4999 /* Emit an assembler directive to set symbol for DECL visibility to
5000 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5003 default_assemble_visibility (tree decl, int vis)
5005 static const char * const visibility_types[] = {
5006 NULL, "internal", "hidden", "protected"
5009 const char *name, *type;
5011 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5012 type = visibility_types[vis];
5014 #ifdef HAVE_GAS_HIDDEN
5015 fprintf (asm_out_file, "\t.%s\t", type);
5016 assemble_name (asm_out_file, name);
5017 fprintf (asm_out_file, "\n");
5019 warning (OPT_Wattributes, "visibility attribute not supported "
5020 "in this configuration; ignored");
5024 /* A helper function to call assemble_visibility when needed for a decl. */
5027 maybe_assemble_visibility (tree decl)
5029 enum symbol_visibility vis = DECL_VISIBILITY (decl);
5031 if (vis != VISIBILITY_DEFAULT)
5032 targetm.asm_out.visibility (decl, vis);
5035 /* Returns 1 if the target configuration supports defining public symbols
5036 so that one of them will be chosen at link time instead of generating a
5037 multiply-defined symbol error, whether through the use of weak symbols or
5038 a target-specific mechanism for having duplicates discarded. */
5041 supports_one_only (void)
5043 if (SUPPORTS_ONE_ONLY)
5045 return SUPPORTS_WEAK;
5048 /* Set up DECL as a public symbol that can be defined in multiple
5049 translation units without generating a linker error. */
5052 make_decl_one_only (tree decl)
5054 gcc_assert (TREE_CODE (decl) == VAR_DECL
5055 || TREE_CODE (decl) == FUNCTION_DECL);
5057 TREE_PUBLIC (decl) = 1;
5059 if (SUPPORTS_ONE_ONLY)
5061 #ifdef MAKE_DECL_ONE_ONLY
5062 MAKE_DECL_ONE_ONLY (decl);
5064 DECL_ONE_ONLY (decl) = 1;
5066 else if (TREE_CODE (decl) == VAR_DECL
5067 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
5068 DECL_COMMON (decl) = 1;
5071 gcc_assert (SUPPORTS_WEAK);
5072 DECL_WEAK (decl) = 1;
5077 init_varasm_once (void)
5079 section_htab = htab_create_ggc (31, section_entry_hash,
5080 section_entry_eq, NULL);
5081 object_block_htab = htab_create_ggc (31, object_block_entry_hash,
5082 object_block_entry_eq, NULL);
5083 const_desc_htab = htab_create_ggc (1009, const_desc_hash,
5084 const_desc_eq, NULL);
5086 const_alias_set = new_alias_set ();
5088 #ifdef TEXT_SECTION_ASM_OP
5089 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
5090 TEXT_SECTION_ASM_OP);
5093 #ifdef DATA_SECTION_ASM_OP
5094 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5095 DATA_SECTION_ASM_OP);
5098 #ifdef SDATA_SECTION_ASM_OP
5099 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5100 SDATA_SECTION_ASM_OP);
5103 #ifdef READONLY_DATA_SECTION_ASM_OP
5104 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
5105 READONLY_DATA_SECTION_ASM_OP);
5108 #ifdef CTORS_SECTION_ASM_OP
5109 ctors_section = get_unnamed_section (0, output_section_asm_op,
5110 CTORS_SECTION_ASM_OP);
5113 #ifdef DTORS_SECTION_ASM_OP
5114 dtors_section = get_unnamed_section (0, output_section_asm_op,
5115 DTORS_SECTION_ASM_OP);
5118 #ifdef BSS_SECTION_ASM_OP
5119 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5120 output_section_asm_op,
5121 BSS_SECTION_ASM_OP);
5124 #ifdef SBSS_SECTION_ASM_OP
5125 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5126 output_section_asm_op,
5127 SBSS_SECTION_ASM_OP);
5130 targetm.asm_out.init_sections ();
5132 if (readonly_data_section == NULL)
5133 readonly_data_section = text_section;
5137 decl_default_tls_model (tree decl)
5139 enum tls_model kind;
5142 is_local = targetm.binds_local_p (decl);
5146 kind = TLS_MODEL_LOCAL_EXEC;
5148 kind = TLS_MODEL_INITIAL_EXEC;
5151 /* Local dynamic is inefficient when we're not combining the
5152 parts of the address. */
5153 else if (optimize && is_local)
5154 kind = TLS_MODEL_LOCAL_DYNAMIC;
5156 kind = TLS_MODEL_GLOBAL_DYNAMIC;
5157 if (kind < flag_tls_default)
5158 kind = flag_tls_default;
5163 /* Select a set of attributes for section NAME based on the properties
5164 of DECL and whether or not RELOC indicates that DECL's initializer
5165 might contain runtime relocations.
5167 We make the section read-only and executable for a function decl,
5168 read-only for a const data decl, and writable for a non-const data decl. */
5171 default_section_type_flags (tree decl, const char *name, int reloc)
5173 return default_section_type_flags_1 (decl, name, reloc, flag_pic);
5177 default_section_type_flags_1 (tree decl, const char *name, int reloc,
5182 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
5183 flags = SECTION_CODE;
5184 else if (decl && decl_readonly_section_1 (decl, reloc, shlib))
5186 else if (current_function_decl
5188 && cfun->unlikely_text_section_name
5189 && strcmp (name, cfun->unlikely_text_section_name) == 0)
5190 flags = SECTION_CODE;
5192 && (!current_function_decl || !cfun)
5193 && strcmp (name, UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
5194 flags = SECTION_CODE;
5196 flags = SECTION_WRITE;
5198 if (decl && DECL_ONE_ONLY (decl))
5199 flags |= SECTION_LINKONCE;
5201 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5202 flags |= SECTION_TLS | SECTION_WRITE;
5204 if (strcmp (name, ".bss") == 0
5205 || strncmp (name, ".bss.", 5) == 0
5206 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
5207 || strcmp (name, ".sbss") == 0
5208 || strncmp (name, ".sbss.", 6) == 0
5209 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
5210 flags |= SECTION_BSS;
5212 if (strcmp (name, ".tdata") == 0
5213 || strncmp (name, ".tdata.", 7) == 0
5214 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
5215 flags |= SECTION_TLS;
5217 if (strcmp (name, ".tbss") == 0
5218 || strncmp (name, ".tbss.", 6) == 0
5219 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
5220 flags |= SECTION_TLS | SECTION_BSS;
5222 /* These three sections have special ELF types. They are neither
5223 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5224 want to print a section type (@progbits or @nobits). If someone
5225 is silly enough to emit code or TLS variables to one of these
5226 sections, then don't handle them specially. */
5227 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
5228 && (strcmp (name, ".init_array") == 0
5229 || strcmp (name, ".fini_array") == 0
5230 || strcmp (name, ".preinit_array") == 0))
5231 flags |= SECTION_NOTYPE;
5236 /* Output assembly to switch to section NAME with attribute FLAGS.
5237 Four variants for common object file formats. */
5240 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
5241 unsigned int flags ATTRIBUTE_UNUSED,
5242 tree decl ATTRIBUTE_UNUSED)
5244 /* Some object formats don't support named sections at all. The
5245 front-end should already have flagged this as an error. */
5250 default_elf_asm_named_section (const char *name, unsigned int flags,
5251 tree decl ATTRIBUTE_UNUSED)
5253 char flagchars[10], *f = flagchars;
5255 /* If we have already declared this section, we can use an
5256 abbreviated form to switch back to it -- unless this section is
5257 part of a COMDAT groups, in which case GAS requires the full
5258 declaration every time. */
5259 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5260 && (flags & SECTION_DECLARED))
5262 fprintf (asm_out_file, "\t.section\t%s\n", name);
5266 if (!(flags & SECTION_DEBUG))
5268 if (flags & SECTION_WRITE)
5270 if (flags & SECTION_CODE)
5272 if (flags & SECTION_SMALL)
5274 if (flags & SECTION_MERGE)
5276 if (flags & SECTION_STRINGS)
5278 if (flags & SECTION_TLS)
5280 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5284 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
5286 if (!(flags & SECTION_NOTYPE))
5291 if (flags & SECTION_BSS)
5297 #ifdef ASM_COMMENT_START
5298 /* On platforms that use "@" as the assembly comment character,
5300 if (strcmp (ASM_COMMENT_START, "@") == 0)
5303 fprintf (asm_out_file, format, type);
5305 if (flags & SECTION_ENTSIZE)
5306 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
5307 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5308 fprintf (asm_out_file, ",%s,comdat",
5309 lang_hooks.decls.comdat_group (decl));
5312 putc ('\n', asm_out_file);
5316 default_coff_asm_named_section (const char *name, unsigned int flags,
5317 tree decl ATTRIBUTE_UNUSED)
5319 char flagchars[8], *f = flagchars;
5321 if (flags & SECTION_WRITE)
5323 if (flags & SECTION_CODE)
5327 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
5331 default_pe_asm_named_section (const char *name, unsigned int flags,
5334 default_coff_asm_named_section (name, flags, decl);
5336 if (flags & SECTION_LINKONCE)
5338 /* Functions may have been compiled at various levels of
5339 optimization so we can't use `same_size' here.
5340 Instead, have the linker pick one. */
5341 fprintf (asm_out_file, "\t.linkonce %s\n",
5342 (flags & SECTION_CODE ? "discard" : "same_size"));
5346 /* The lame default section selector. */
5349 default_select_section (tree decl, int reloc,
5350 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
5354 if (decl_readonly_section (decl, reloc))
5355 return readonly_data_section;
5357 else if (TREE_CODE (decl) == CONSTRUCTOR)
5359 if (! ((flag_pic && reloc)
5360 || !TREE_READONLY (decl)
5361 || TREE_SIDE_EFFECTS (decl)
5362 || !TREE_CONSTANT (decl)))
5363 return readonly_data_section;
5365 else if (TREE_CODE (decl) == STRING_CST)
5366 return readonly_data_section;
5367 else if (! (flag_pic && reloc))
5368 return readonly_data_section;
5370 return data_section;
5373 enum section_category
5374 categorize_decl_for_section (tree decl, int reloc, int shlib)
5376 enum section_category ret;
5378 if (TREE_CODE (decl) == FUNCTION_DECL)
5380 else if (TREE_CODE (decl) == STRING_CST)
5382 if (flag_mudflap) /* or !flag_merge_constants */
5383 return SECCAT_RODATA;
5385 return SECCAT_RODATA_MERGE_STR;
5387 else if (TREE_CODE (decl) == VAR_DECL)
5389 if (DECL_INITIAL (decl) == NULL
5390 || DECL_INITIAL (decl) == error_mark_node
5391 || (flag_zero_initialized_in_bss
5392 /* Leave constant zeroes in .rodata so they can be shared. */
5393 && !TREE_READONLY (decl)
5394 && initializer_zerop (DECL_INITIAL (decl))))
5396 else if (! TREE_READONLY (decl)
5397 || TREE_SIDE_EFFECTS (decl)
5398 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
5400 if (shlib && (reloc & 2))
5401 ret = SECCAT_DATA_REL;
5402 else if (shlib && reloc)
5403 ret = SECCAT_DATA_REL_LOCAL;
5407 else if (shlib && (reloc & 2))
5408 ret = SECCAT_DATA_REL_RO;
5409 else if (shlib && reloc)
5410 ret = SECCAT_DATA_REL_RO_LOCAL;
5411 else if (reloc || flag_merge_constants < 2)
5412 /* C and C++ don't allow different variables to share the same
5413 location. -fmerge-all-constants allows even that (at the
5414 expense of not conforming). */
5415 ret = SECCAT_RODATA;
5416 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
5417 ret = SECCAT_RODATA_MERGE_STR_INIT;
5419 ret = SECCAT_RODATA_MERGE_CONST;
5421 else if (TREE_CODE (decl) == CONSTRUCTOR)
5423 if ((shlib && reloc)
5424 || TREE_SIDE_EFFECTS (decl)
5425 || ! TREE_CONSTANT (decl))
5428 ret = SECCAT_RODATA;
5431 ret = SECCAT_RODATA;
5433 /* There are no read-only thread-local sections. */
5434 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5436 /* Note that this would be *just* SECCAT_BSS, except that there's
5437 no concept of a read-only thread-local-data section. */
5438 if (ret == SECCAT_BSS
5439 || (flag_zero_initialized_in_bss
5440 && initializer_zerop (DECL_INITIAL (decl))))
5446 /* If the target uses small data sections, select it. */
5447 else if (targetm.in_small_data_p (decl))
5449 if (ret == SECCAT_BSS)
5451 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
5452 ret = SECCAT_SRODATA;
5461 decl_readonly_section (tree decl, int reloc)
5463 return decl_readonly_section_1 (decl, reloc, flag_pic);
5467 decl_readonly_section_1 (tree decl, int reloc, int shlib)
5469 switch (categorize_decl_for_section (decl, reloc, shlib))
5472 case SECCAT_RODATA_MERGE_STR:
5473 case SECCAT_RODATA_MERGE_STR_INIT:
5474 case SECCAT_RODATA_MERGE_CONST:
5475 case SECCAT_SRODATA:
5484 /* Select a section based on the above categorization. */
5487 default_elf_select_section (tree decl, int reloc,
5488 unsigned HOST_WIDE_INT align)
5490 return default_elf_select_section_1 (decl, reloc, align, flag_pic);
5494 default_elf_select_section_1 (tree decl, int reloc,
5495 unsigned HOST_WIDE_INT align, int shlib)
5498 switch (categorize_decl_for_section (decl, reloc, shlib))
5501 /* We're not supposed to be called on FUNCTION_DECLs. */
5504 return readonly_data_section;
5505 case SECCAT_RODATA_MERGE_STR:
5506 return mergeable_string_section (decl, align, 0);
5507 case SECCAT_RODATA_MERGE_STR_INIT:
5508 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
5509 case SECCAT_RODATA_MERGE_CONST:
5510 return mergeable_constant_section (DECL_MODE (decl), align, 0);
5511 case SECCAT_SRODATA:
5515 return data_section;
5516 case SECCAT_DATA_REL:
5517 sname = ".data.rel";
5519 case SECCAT_DATA_REL_LOCAL:
5520 sname = ".data.rel.local";
5522 case SECCAT_DATA_REL_RO:
5523 sname = ".data.rel.ro";
5525 case SECCAT_DATA_REL_RO_LOCAL:
5526 sname = ".data.rel.ro.local";
5551 return get_named_section (decl, sname, reloc);
5554 /* Construct a unique section name based on the decl name and the
5555 categorization performed above. */
5558 default_unique_section (tree decl, int reloc)
5560 default_unique_section_1 (decl, reloc, flag_pic);
5564 default_unique_section_1 (tree decl, int reloc, int shlib)
5566 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
5567 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
5568 const char *prefix, *name;
5572 switch (categorize_decl_for_section (decl, reloc, shlib))
5575 prefix = one_only ? ".gnu.linkonce.t." : ".text.";
5578 case SECCAT_RODATA_MERGE_STR:
5579 case SECCAT_RODATA_MERGE_STR_INIT:
5580 case SECCAT_RODATA_MERGE_CONST:
5581 prefix = one_only ? ".gnu.linkonce.r." : ".rodata.";
5583 case SECCAT_SRODATA:
5584 prefix = one_only ? ".gnu.linkonce.s2." : ".sdata2.";
5587 prefix = one_only ? ".gnu.linkonce.d." : ".data.";
5589 case SECCAT_DATA_REL:
5590 prefix = one_only ? ".gnu.linkonce.d.rel." : ".data.rel.";
5592 case SECCAT_DATA_REL_LOCAL:
5593 prefix = one_only ? ".gnu.linkonce.d.rel.local." : ".data.rel.local.";
5595 case SECCAT_DATA_REL_RO:
5596 prefix = one_only ? ".gnu.linkonce.d.rel.ro." : ".data.rel.ro.";
5598 case SECCAT_DATA_REL_RO_LOCAL:
5599 prefix = one_only ? ".gnu.linkonce.d.rel.ro.local."
5600 : ".data.rel.ro.local.";
5603 prefix = one_only ? ".gnu.linkonce.s." : ".sdata.";
5606 prefix = one_only ? ".gnu.linkonce.b." : ".bss.";
5609 prefix = one_only ? ".gnu.linkonce.sb." : ".sbss.";
5612 prefix = one_only ? ".gnu.linkonce.td." : ".tdata.";
5615 prefix = one_only ? ".gnu.linkonce.tb." : ".tbss.";
5620 plen = strlen (prefix);
5622 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5623 name = targetm.strip_name_encoding (name);
5624 nlen = strlen (name);
5626 string = alloca (nlen + plen + 1);
5627 memcpy (string, prefix, plen);
5628 memcpy (string + plen, name, nlen + 1);
5630 DECL_SECTION_NAME (decl) = build_string (nlen + plen, string);
5634 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED,
5636 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
5639 switch (GET_CODE (x))
5644 return data_section;
5650 return readonly_data_section;
5654 default_elf_select_rtx_section (enum machine_mode mode, rtx x,
5655 unsigned HOST_WIDE_INT align)
5657 /* ??? Handle small data here somehow. */
5660 switch (GET_CODE (x))
5664 return get_named_section (NULL, ".data.rel.ro", 3);
5667 return get_named_section (NULL, ".data.rel.ro.local", 1);
5673 return mergeable_constant_section (mode, align, 0);
5676 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
5679 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
5684 /* Careful not to prod global register variables. */
5687 symbol = XEXP (rtl, 0);
5688 if (GET_CODE (symbol) != SYMBOL_REF)
5691 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_IN_BLOCK;
5692 if (TREE_CODE (decl) == FUNCTION_DECL)
5693 flags |= SYMBOL_FLAG_FUNCTION;
5694 if (targetm.binds_local_p (decl))
5695 flags |= SYMBOL_FLAG_LOCAL;
5696 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5697 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
5698 else if (targetm.in_small_data_p (decl))
5699 flags |= SYMBOL_FLAG_SMALL;
5700 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
5701 being PUBLIC, the thing *must* be defined in this translation unit.
5702 Prevent this buglet from being propagated into rtl code as well. */
5703 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
5704 flags |= SYMBOL_FLAG_EXTERNAL;
5706 SYMBOL_REF_FLAGS (symbol) = flags;
5709 /* By default, we do nothing for encode_section_info, so we need not
5710 do anything but discard the '*' marker. */
5713 default_strip_name_encoding (const char *str)
5715 return str + (*str == '*');
5718 #ifdef ASM_OUTPUT_DEF
5719 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
5720 anchor relative to ".", the current section position. */
5723 default_asm_output_anchor (rtx symbol)
5727 sprintf (buffer, ". + " HOST_WIDE_INT_PRINT_DEC,
5728 SYMBOL_REF_BLOCK_OFFSET (symbol));
5729 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
5733 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
5736 default_use_anchors_for_symbol_p (rtx symbol)
5741 /* Don't use anchors for mergeable sections. The linker might move
5742 the objects around. */
5743 sect = SYMBOL_REF_BLOCK (symbol)->sect;
5744 if (sect->common.flags & SECTION_MERGE)
5747 /* Don't use anchors for small data sections. The small data register
5748 acts as an anchor for such sections. */
5749 if (sect->common.flags & SECTION_SMALL)
5752 decl = SYMBOL_REF_DECL (symbol);
5753 if (decl && DECL_P (decl))
5755 /* Don't use section anchors for decls that might be defined by
5757 if (!targetm.binds_local_p (decl))
5760 /* Don't use section anchors for decls that will be placed in a
5761 small data section. */
5762 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
5763 one above. The problem is that we only use SECTION_SMALL for
5764 sections that should be marked as small in the section directive. */
5765 if (targetm.in_small_data_p (decl))
5771 /* Assume ELF-ish defaults, since that's pretty much the most liberal
5772 wrt cross-module name binding. */
5775 default_binds_local_p (tree exp)
5777 return default_binds_local_p_1 (exp, flag_shlib);
5781 default_binds_local_p_1 (tree exp, int shlib)
5785 /* A non-decl is an entry in the constant pool. */
5788 /* Weakrefs may not bind locally, even though the weakref itself is
5789 always static and therefore local. */
5790 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp)))
5792 /* Static variables are always local. */
5793 else if (! TREE_PUBLIC (exp))
5795 /* A variable is local if the user has said explicitly that it will
5797 else if (DECL_VISIBILITY_SPECIFIED (exp)
5798 && DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
5800 /* Variables defined outside this object might not be local. */
5801 else if (DECL_EXTERNAL (exp))
5803 /* If defined in this object and visibility is not default, must be
5805 else if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
5807 /* Default visibility weak data can be overridden by a strong symbol
5808 in another module and so are not local. */
5809 else if (DECL_WEAK (exp))
5811 /* If PIC, then assume that any global name can be overridden by
5812 symbols resolved from other modules. */
5815 /* Uninitialized COMMON variable may be unified with symbols
5816 resolved from other modules. */
5817 else if (DECL_COMMON (exp)
5818 && (DECL_INITIAL (exp) == NULL
5819 || DECL_INITIAL (exp) == error_mark_node))
5821 /* Otherwise we're left with initialized (or non-common) global data
5822 which is of necessity defined locally. */
5829 /* Determine whether or not a pointer mode is valid. Assume defaults
5830 of ptr_mode or Pmode - can be overridden. */
5832 default_valid_pointer_mode (enum machine_mode mode)
5834 return (mode == ptr_mode || mode == Pmode);
5837 /* Default function to output code that will globalize a label. A
5838 target must define GLOBAL_ASM_OP or provide its own function to
5839 globalize a label. */
5840 #ifdef GLOBAL_ASM_OP
5842 default_globalize_label (FILE * stream, const char *name)
5844 fputs (GLOBAL_ASM_OP, stream);
5845 assemble_name (stream, name);
5846 putc ('\n', stream);
5848 #endif /* GLOBAL_ASM_OP */
5850 /* Default function to output a label for unwind information. The
5851 default is to do nothing. A target that needs nonlocal labels for
5852 unwind information must provide its own function to do this. */
5854 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
5855 tree decl ATTRIBUTE_UNUSED,
5856 int for_eh ATTRIBUTE_UNUSED,
5857 int empty ATTRIBUTE_UNUSED)
5861 /* Default function to output a label to divide up the exception table.
5862 The default is to do nothing. A target that needs/wants to divide
5863 up the table must provide it's own function to do this. */
5865 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
5869 /* This is how to output an internal numbered label where PREFIX is
5870 the class of label and LABELNO is the number within the class. */
5873 default_internal_label (FILE *stream, const char *prefix,
5874 unsigned long labelno)
5876 char *const buf = alloca (40 + strlen (prefix));
5877 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
5878 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
5881 /* This is the default behavior at the beginning of a file. It's
5882 controlled by two other target-hook toggles. */
5884 default_file_start (void)
5886 if (targetm.file_start_app_off && !flag_verbose_asm)
5887 fputs (ASM_APP_OFF, asm_out_file);
5889 if (targetm.file_start_file_directive)
5890 output_file_directive (asm_out_file, main_input_filename);
5893 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
5894 which emits a special section directive used to indicate whether or
5895 not this object file needs an executable stack. This is primarily
5896 a GNU extension to ELF but could be used on other targets. */
5898 int trampolines_created;
5901 file_end_indicate_exec_stack (void)
5903 unsigned int flags = SECTION_DEBUG;
5904 if (trampolines_created)
5905 flags |= SECTION_CODE;
5907 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
5910 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
5911 a get_unnamed_section callback. */
5914 output_section_asm_op (const void *directive)
5916 fprintf (asm_out_file, "%s\n", (const char *) directive);
5919 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
5920 the current section is NEW_SECTION. */
5923 switch_to_section (section *new_section)
5925 if (in_section == new_section)
5928 if (new_section->common.flags & SECTION_FORGET)
5931 in_section = new_section;
5933 if (new_section->common.flags & SECTION_NAMED)
5936 && !cfun->unlikely_text_section_name
5937 && strcmp (new_section->named.name,
5938 UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
5939 cfun->unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
5941 targetm.asm_out.named_section (new_section->named.name,
5942 new_section->named.common.flags,
5943 new_section->named.decl);
5946 new_section->unnamed.callback (new_section->unnamed.data);
5948 new_section->common.flags |= SECTION_DECLARED;
5951 /* If block symbol SYMBOL has not yet been assigned an offset, place
5952 it at the end of its block. */
5955 place_block_symbol (rtx symbol)
5957 unsigned HOST_WIDE_INT size, mask, offset;
5958 struct constant_descriptor_rtx *desc;
5959 unsigned int alignment;
5960 struct object_block *block;
5963 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
5966 /* Work out the symbol's size and alignment. */
5967 if (CONSTANT_POOL_ADDRESS_P (symbol))
5969 desc = SYMBOL_REF_CONSTANT (symbol);
5970 alignment = desc->align;
5971 size = GET_MODE_SIZE (desc->mode);
5973 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
5975 decl = SYMBOL_REF_DECL (symbol);
5976 alignment = get_constant_alignment (decl);
5977 size = get_constant_size (decl);
5981 decl = SYMBOL_REF_DECL (symbol);
5982 alignment = DECL_ALIGN (decl);
5983 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
5986 /* Calculate the object's offset from the start of the block. */
5987 block = SYMBOL_REF_BLOCK (symbol);
5988 mask = alignment / BITS_PER_UNIT - 1;
5989 offset = (block->size + mask) & ~mask;
5990 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
5992 /* Record the block's new alignment and size. */
5993 block->alignment = MAX (block->alignment, alignment);
5994 block->size = offset + size;
5996 VEC_safe_push (rtx, gc, block->objects, symbol);
5999 /* Return the anchor that should be used to address byte offset OFFSET
6000 from the first object in BLOCK. MODEL is the TLS model used
6004 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
6005 enum tls_model model)
6008 unsigned int begin, middle, end;
6009 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
6012 /* Work out the anchor's offset. Use an offset of 0 for the first
6013 anchor so that we don't pessimize the case where we take the address
6014 of a variable at the beginning of the block. This is particularly
6015 useful when a block has only one variable assigned to it.
6017 We try to place anchors RANGE bytes apart, so there can then be
6018 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6019 a ptr_mode offset. With some target settings, the lowest such
6020 anchor might be out of range for the lowest ptr_mode offset;
6021 likewise the highest anchor for the highest offset. Use anchors
6022 at the extreme ends of the ptr_mode range in such cases.
6024 All arithmetic uses unsigned integers in order to avoid
6026 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
6027 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
6028 range = max_offset - min_offset + 1;
6033 bias = 1 << (GET_MODE_BITSIZE (ptr_mode) - 1);
6036 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
6037 delta -= delta % range;
6040 offset = (HOST_WIDE_INT) (-delta);
6044 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
6045 delta -= delta % range;
6046 if (delta > bias - 1)
6048 offset = (HOST_WIDE_INT) delta;
6052 /* Do a binary search to see if there's already an anchor we can use.
6053 Set BEGIN to the new anchor's index if not. */
6055 end = VEC_length (rtx, block->anchors);
6056 while (begin != end)
6058 middle = (end + begin) / 2;
6059 anchor = VEC_index (rtx, block->anchors, middle);
6060 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
6062 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
6064 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
6066 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
6072 /* Create a new anchor with a unique label. */
6073 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
6074 anchor = create_block_symbol (ggc_strdup (label), block, offset);
6075 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
6076 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
6078 /* Insert it at index BEGIN. */
6079 VEC_safe_insert (rtx, gc, block->anchors, begin, anchor);
6083 /* Output the objects in BLOCK. */
6086 output_object_block (struct object_block *block)
6088 struct constant_descriptor_rtx *desc;
6090 HOST_WIDE_INT offset;
6094 if (block->objects == NULL)
6097 /* Switch to the section and make sure that the first byte is
6098 suitably aligned. */
6099 switch_to_section (block->sect);
6100 assemble_align (block->alignment);
6102 /* Define the values of all anchors relative to the current section
6104 for (i = 0; VEC_iterate (rtx, block->anchors, i, symbol); i++)
6105 targetm.asm_out.output_anchor (symbol);
6107 /* Output the objects themselves. */
6109 for (i = 0; VEC_iterate (rtx, block->objects, i, symbol); i++)
6111 /* Move to the object's offset, padding with zeros if necessary. */
6112 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
6113 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
6114 if (CONSTANT_POOL_ADDRESS_P (symbol))
6116 desc = SYMBOL_REF_CONSTANT (symbol);
6117 output_constant_pool_1 (desc, 1);
6118 offset += GET_MODE_SIZE (desc->mode);
6120 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6122 decl = SYMBOL_REF_DECL (symbol);
6123 assemble_constant_contents (decl, XSTR (symbol, 0),
6124 get_constant_alignment (decl));
6125 offset += get_constant_size (decl);
6129 decl = SYMBOL_REF_DECL (symbol);
6130 assemble_variable_contents (decl, XSTR (symbol, 0), false);
6131 offset += tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6136 /* A htab_traverse callback used to call output_object_block for
6137 each member of object_block_htab. */
6140 output_object_block_htab (void **slot, void *data ATTRIBUTE_UNUSED)
6142 output_object_block ((struct object_block *) (*slot));
6146 /* Output the definitions of all object_blocks. */
6149 output_object_blocks (void)
6151 htab_traverse (object_block_htab, output_object_block_htab, NULL);
6154 #include "gt-varasm.h"