1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
24 /* This file handles generation of all the assembler code
25 *except* the instructions of a function.
26 This includes declarations of variables and their initial values.
28 We also output the assembler code for constants stored in memory
29 and are responsible for combining constants with the same value. */
33 #include "coretypes.h"
40 #include "hard-reg-set.h"
48 #include "langhooks.h"
52 #include "tree-mudflap.h"
54 #include "cfglayout.h"
55 #include "basic-block.h"
57 #ifdef XCOFF_DEBUGGING_INFO
58 #include "xcoffout.h" /* Needed for external data
59 declarations for e.g. AIX 4.x. */
62 /* The (assembler) name of the first globally-visible object output. */
63 extern GTY(()) const char *first_global_object_name;
64 extern GTY(()) const char *weak_global_object_name;
66 const char *first_global_object_name;
67 const char *weak_global_object_name;
70 struct constant_descriptor_rtx;
71 struct rtx_constant_pool;
73 struct varasm_status GTY(())
75 /* If we're using a per-function constant pool, this is it. */
76 struct rtx_constant_pool *pool;
78 /* Number of tree-constants deferred during the expansion of this
80 unsigned int deferred_constants;
83 #define n_deferred_constants (cfun->varasm->deferred_constants)
85 /* Number for making the label on the next
86 constant that is stored in memory. */
88 static GTY(()) int const_labelno;
90 /* Carry information from ASM_DECLARE_OBJECT_NAME
91 to ASM_FINISH_DECLARE_OBJECT. */
93 int size_directive_output;
95 /* The last decl for which assemble_variable was called,
96 if it did ASM_DECLARE_OBJECT_NAME.
97 If the last call to assemble_variable didn't do that,
100 tree last_assemble_variable_decl;
102 /* The following global variable indicates if the first basic block
103 in a function belongs to the cold partition or not. */
105 bool first_function_block_is_cold;
107 /* We give all constants their own alias set. Perhaps redundant with
108 MEM_READONLY_P, but pre-dates it. */
110 static HOST_WIDE_INT const_alias_set;
112 static const char *strip_reg_name (const char *);
113 static int contains_pointers_p (tree);
114 #ifdef ASM_OUTPUT_EXTERNAL
115 static bool incorporeal_function_p (tree);
117 static void decode_addr_const (tree, struct addr_const *);
118 static hashval_t const_desc_hash (const void *);
119 static int const_desc_eq (const void *, const void *);
120 static hashval_t const_hash_1 (const tree);
121 static int compare_constant (const tree, const tree);
122 static tree copy_constant (tree);
123 static void output_constant_def_contents (rtx);
124 static void output_addressed_constants (tree);
125 static unsigned HOST_WIDE_INT array_size_for_constructor (tree);
126 static unsigned min_align (unsigned, unsigned);
127 static void output_constructor (tree, unsigned HOST_WIDE_INT, unsigned int);
128 static void globalize_decl (tree);
129 #ifdef BSS_SECTION_ASM_OP
130 #ifdef ASM_OUTPUT_BSS
131 static void asm_output_bss (FILE *, tree, const char *,
132 unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT);
134 #ifdef ASM_OUTPUT_ALIGNED_BSS
135 static void asm_output_aligned_bss (FILE *, tree, const char *,
136 unsigned HOST_WIDE_INT, int)
139 #endif /* BSS_SECTION_ASM_OP */
140 static void mark_weak (tree);
141 static void output_constant_pool (const char *, tree);
143 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
144 section *text_section;
145 section *data_section;
146 section *readonly_data_section;
147 section *sdata_section;
148 section *ctors_section;
149 section *dtors_section;
150 section *bss_section;
151 section *sbss_section;
153 /* Various forms of common section. All are guaranteed to be nonnull. */
154 section *tls_comm_section;
155 section *comm_section;
156 section *lcomm_section;
158 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
160 section *bss_noswitch_section;
162 /* The section that holds the main exception table, when known. The section
163 is set either by the target's init_sections hook or by the first call to
164 switch_to_exception_section. */
165 section *exception_section;
167 /* The section that holds the DWARF2 frame unwind information, when known.
168 The section is set either by the target's init_sections hook or by the
169 first call to switch_to_eh_frame_section. */
170 section *eh_frame_section;
172 /* asm_out_file's current section. This is NULL if no section has yet
173 been selected or if we lose track of what the current section is. */
176 /* True if code for the current function is currently being directed
177 at the cold section. */
178 bool in_cold_section_p;
180 /* A linked list of all the unnamed sections. */
181 static GTY(()) section *unnamed_sections;
183 /* Return a nonzero value if DECL has a section attribute. */
184 #ifndef IN_NAMED_SECTION
185 #define IN_NAMED_SECTION(DECL) \
186 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
187 && DECL_SECTION_NAME (DECL) != NULL_TREE)
190 /* Hash table of named sections. */
191 static GTY((param_is (section))) htab_t section_htab;
193 /* A table of object_blocks, indexed by section. */
194 static GTY((param_is (struct object_block))) htab_t object_block_htab;
196 /* The next number to use for internal anchor labels. */
197 static GTY(()) int anchor_labelno;
199 /* A pool of constants that can be shared between functions. */
200 static GTY(()) struct rtx_constant_pool *shared_constant_pool;
202 /* Helper routines for maintaining section_htab. */
205 section_entry_eq (const void *p1, const void *p2)
207 const section *old = p1;
208 const char *new = p2;
210 return strcmp (old->named.name, new) == 0;
214 section_entry_hash (const void *p)
216 const section *old = p;
217 return htab_hash_string (old->named.name);
220 /* Return a hash value for section SECT. */
223 hash_section (section *sect)
225 if (sect->common.flags & SECTION_NAMED)
226 return htab_hash_string (sect->named.name);
227 return sect->common.flags;
230 /* Helper routines for maintaining object_block_htab. */
233 object_block_entry_eq (const void *p1, const void *p2)
235 const struct object_block *old = p1;
236 const section *new = p2;
238 return old->sect == new;
242 object_block_entry_hash (const void *p)
244 const struct object_block *old = p;
245 return hash_section (old->sect);
248 /* Return a new unnamed section with the given fields. */
251 get_unnamed_section (unsigned int flags, void (*callback) (const void *),
256 sect = ggc_alloc (sizeof (struct unnamed_section));
257 sect->unnamed.common.flags = flags | SECTION_UNNAMED;
258 sect->unnamed.callback = callback;
259 sect->unnamed.data = data;
260 sect->unnamed.next = unnamed_sections;
262 unnamed_sections = sect;
266 /* Return a SECTION_NOSWITCH section with the given fields. */
269 get_noswitch_section (unsigned int flags, noswitch_section_callback callback)
273 sect = ggc_alloc (sizeof (struct unnamed_section));
274 sect->noswitch.common.flags = flags | SECTION_NOSWITCH;
275 sect->noswitch.callback = callback;
280 /* Return the named section structure associated with NAME. Create
281 a new section with the given fields if no such structure exists. */
284 get_section (const char *name, unsigned int flags, tree decl)
286 section *sect, **slot;
289 htab_find_slot_with_hash (section_htab, name,
290 htab_hash_string (name), INSERT);
291 flags |= SECTION_NAMED;
294 sect = ggc_alloc (sizeof (struct named_section));
295 sect->named.common.flags = flags;
296 sect->named.name = ggc_strdup (name);
297 sect->named.decl = decl;
303 if ((sect->common.flags & ~SECTION_DECLARED) != flags
304 && ((sect->common.flags | flags) & SECTION_OVERRIDE) == 0)
306 /* Sanity check user variables for flag changes. */
308 decl = sect->named.decl;
310 error ("%+D causes a section type conflict", decl);
316 /* Return true if the current compilation mode benefits from having
317 objects grouped into blocks. */
320 use_object_blocks_p (void)
322 return flag_section_anchors;
325 /* Return the object_block structure for section SECT. Create a new
326 structure if we haven't created one already. Return null if SECT
329 static struct object_block *
330 get_block_for_section (section *sect)
332 struct object_block *block;
338 slot = htab_find_slot_with_hash (object_block_htab, sect,
339 hash_section (sect), INSERT);
340 block = (struct object_block *) *slot;
343 block = (struct object_block *)
344 ggc_alloc_cleared (sizeof (struct object_block));
351 /* Create a symbol with label LABEL and place it at byte offset
352 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
353 is not yet known. LABEL must be a garbage-collected string. */
356 create_block_symbol (const char *label, struct object_block *block,
357 HOST_WIDE_INT offset)
362 /* Create the extended SYMBOL_REF. */
363 size = RTX_HDR_SIZE + sizeof (struct block_symbol);
364 symbol = ggc_alloc_zone (size, &rtl_zone);
366 /* Initialize the normal SYMBOL_REF fields. */
367 memset (symbol, 0, size);
368 PUT_CODE (symbol, SYMBOL_REF);
369 PUT_MODE (symbol, Pmode);
370 XSTR (symbol, 0) = label;
371 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_HAS_BLOCK_INFO;
373 /* Initialize the block_symbol stuff. */
374 SYMBOL_REF_BLOCK (symbol) = block;
375 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
381 initialize_cold_section_name (void)
383 const char *stripped_name;
387 gcc_assert (cfun && current_function_decl);
388 if (cfun->unlikely_text_section_name)
391 dsn = DECL_SECTION_NAME (current_function_decl);
392 if (flag_function_sections && dsn)
394 name = alloca (TREE_STRING_LENGTH (dsn) + 1);
395 memcpy (name, TREE_STRING_POINTER (dsn), TREE_STRING_LENGTH (dsn) + 1);
397 stripped_name = targetm.strip_name_encoding (name);
399 buffer = ACONCAT ((stripped_name, "_unlikely", NULL));
400 cfun->unlikely_text_section_name = ggc_strdup (buffer);
403 cfun->unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
406 /* Tell assembler to switch to unlikely-to-be-executed text section. */
409 unlikely_text_section (void)
413 if (!cfun->unlikely_text_section_name)
414 initialize_cold_section_name ();
416 return get_named_section (NULL, cfun->unlikely_text_section_name, 0);
419 return get_named_section (NULL, UNLIKELY_EXECUTED_TEXT_SECTION_NAME, 0);
422 /* When called within a function context, return true if the function
423 has been assigned a cold text section and if SECT is that section.
424 When called outside a function context, return true if SECT is the
425 default cold section. */
428 unlikely_text_section_p (section *sect)
433 name = cfun->unlikely_text_section_name;
435 name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
439 && SECTION_STYLE (sect) == SECTION_NAMED
440 && strcmp (name, sect->named.name) == 0);
443 /* Return a section with a particular name and with whatever SECTION_*
444 flags section_type_flags deems appropriate. The name of the section
445 is taken from NAME if nonnull, otherwise it is taken from DECL's
446 DECL_SECTION_NAME. DECL is the decl associated with the section
447 (see the section comment for details) and RELOC is as for
448 section_type_flags. */
451 get_named_section (tree decl, const char *name, int reloc)
455 gcc_assert (!decl || DECL_P (decl));
457 name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
459 flags = targetm.section_type_flags (decl, name, reloc);
461 return get_section (name, flags, decl);
464 /* If required, set DECL_SECTION_NAME to a unique name. */
467 resolve_unique_section (tree decl, int reloc ATTRIBUTE_UNUSED,
468 int flag_function_or_data_sections)
470 if (DECL_SECTION_NAME (decl) == NULL_TREE
471 && targetm.have_named_sections
472 && (flag_function_or_data_sections
473 || DECL_ONE_ONLY (decl)))
474 targetm.asm_out.unique_section (decl, reloc);
477 #ifdef BSS_SECTION_ASM_OP
479 #ifdef ASM_OUTPUT_BSS
481 /* Utility function for ASM_OUTPUT_BSS for targets to use if
482 they don't support alignments in .bss.
483 ??? It is believed that this function will work in most cases so such
484 support is localized here. */
487 asm_output_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
489 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
490 unsigned HOST_WIDE_INT rounded)
492 targetm.asm_out.globalize_label (file, name);
493 switch_to_section (bss_section);
494 #ifdef ASM_DECLARE_OBJECT_NAME
495 last_assemble_variable_decl = decl;
496 ASM_DECLARE_OBJECT_NAME (file, name, decl);
498 /* Standard thing is just output label for the object. */
499 ASM_OUTPUT_LABEL (file, name);
500 #endif /* ASM_DECLARE_OBJECT_NAME */
501 ASM_OUTPUT_SKIP (file, rounded ? rounded : 1);
506 #ifdef ASM_OUTPUT_ALIGNED_BSS
508 /* Utility function for targets to use in implementing
509 ASM_OUTPUT_ALIGNED_BSS.
510 ??? It is believed that this function will work in most cases so such
511 support is localized here. */
514 asm_output_aligned_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
515 const char *name, unsigned HOST_WIDE_INT size,
518 switch_to_section (bss_section);
519 ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
520 #ifdef ASM_DECLARE_OBJECT_NAME
521 last_assemble_variable_decl = decl;
522 ASM_DECLARE_OBJECT_NAME (file, name, decl);
524 /* Standard thing is just output label for the object. */
525 ASM_OUTPUT_LABEL (file, name);
526 #endif /* ASM_DECLARE_OBJECT_NAME */
527 ASM_OUTPUT_SKIP (file, size ? size : 1);
532 #endif /* BSS_SECTION_ASM_OP */
534 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
535 /* Return the hot section for function DECL. Return text_section for
539 hot_function_section (tree decl)
541 if (decl != NULL_TREE
542 && DECL_SECTION_NAME (decl) != NULL_TREE
543 && targetm.have_named_sections)
544 return get_named_section (decl, NULL, 0);
550 /* Return the section for function DECL.
552 If DECL is NULL_TREE, return the text section. We can be passed
553 NULL_TREE under some circumstances by dbxout.c at least. */
556 function_section (tree decl)
560 if (first_function_block_is_cold)
563 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
564 if (decl != NULL_TREE
565 && DECL_SECTION_NAME (decl) != NULL_TREE)
566 return reloc ? unlikely_text_section ()
567 : get_named_section (decl, NULL, 0);
569 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
571 return reloc ? unlikely_text_section () : hot_function_section (decl);
576 current_function_section (void)
578 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
579 if (current_function_decl != NULL_TREE
580 && DECL_SECTION_NAME (current_function_decl) != NULL_TREE)
581 return in_cold_section_p ? unlikely_text_section ()
582 : get_named_section (current_function_decl,
585 return targetm.asm_out.select_section (current_function_decl,
587 DECL_ALIGN (current_function_decl));
589 return (in_cold_section_p
590 ? unlikely_text_section ()
591 : hot_function_section (current_function_decl));
595 /* Return the read-only data section associated with function DECL. */
598 default_function_rodata_section (tree decl)
600 if (decl != NULL_TREE && DECL_SECTION_NAME (decl))
602 const char *name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
604 if (DECL_ONE_ONLY (decl) && HAVE_COMDAT_GROUP)
606 size_t len = strlen (name) + 3;
607 char* rname = alloca (len);
609 strcpy (rname, ".rodata");
610 strcat (rname, name + 5);
611 return get_section (rname, SECTION_LINKONCE, decl);
613 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
614 else if (DECL_ONE_ONLY (decl)
615 && strncmp (name, ".gnu.linkonce.t.", 16) == 0)
617 size_t len = strlen (name) + 1;
618 char *rname = alloca (len);
620 memcpy (rname, name, len);
622 return get_section (rname, SECTION_LINKONCE, decl);
624 /* For .text.foo we want to use .rodata.foo. */
625 else if (flag_function_sections && flag_data_sections
626 && strncmp (name, ".text.", 6) == 0)
628 size_t len = strlen (name) + 1;
629 char *rname = alloca (len + 2);
631 memcpy (rname, ".rodata", 7);
632 memcpy (rname + 7, name + 5, len - 5);
633 return get_section (rname, 0, decl);
637 return readonly_data_section;
640 /* Return the read-only data section associated with function DECL
641 for targets where that section should be always the single
642 readonly data section. */
645 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED)
647 return readonly_data_section;
650 /* Return the section to use for string merging. */
653 mergeable_string_section (tree decl ATTRIBUTE_UNUSED,
654 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
655 unsigned int flags ATTRIBUTE_UNUSED)
659 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
660 && TREE_CODE (decl) == STRING_CST
661 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
663 && (len = int_size_in_bytes (TREE_TYPE (decl))) > 0
664 && TREE_STRING_LENGTH (decl) >= len)
666 enum machine_mode mode;
667 unsigned int modesize;
673 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (decl)));
674 modesize = GET_MODE_BITSIZE (mode);
675 if (modesize >= 8 && modesize <= 256
676 && (modesize & (modesize - 1)) == 0)
678 if (align < modesize)
681 str = TREE_STRING_POINTER (decl);
682 unit = GET_MODE_SIZE (mode);
684 /* Check for embedded NUL characters. */
685 for (i = 0; i < len; i += unit)
687 for (j = 0; j < unit; j++)
688 if (str[i + j] != '\0')
695 sprintf (name, ".rodata.str%d.%d", modesize / 8,
697 flags |= (modesize / 8) | SECTION_MERGE | SECTION_STRINGS;
698 return get_section (name, flags, NULL);
703 return readonly_data_section;
706 /* Return the section to use for constant merging. */
709 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED,
710 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
711 unsigned int flags ATTRIBUTE_UNUSED)
713 unsigned int modesize = GET_MODE_BITSIZE (mode);
715 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
721 && (align & (align - 1)) == 0)
725 sprintf (name, ".rodata.cst%d", (int) (align / 8));
726 flags |= (align / 8) | SECTION_MERGE;
727 return get_section (name, flags, NULL);
729 return readonly_data_section;
732 /* Given NAME, a putative register name, discard any customary prefixes. */
735 strip_reg_name (const char *name)
737 #ifdef REGISTER_PREFIX
738 if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
739 name += strlen (REGISTER_PREFIX);
741 if (name[0] == '%' || name[0] == '#')
746 /* The user has asked for a DECL to have a particular name. Set (or
747 change) it in such a way that we don't prefix an underscore to
750 set_user_assembler_name (tree decl, const char *name)
752 char *starred = alloca (strlen (name) + 2);
754 strcpy (starred + 1, name);
755 change_decl_assembler_name (decl, get_identifier (starred));
756 SET_DECL_RTL (decl, NULL_RTX);
759 /* Decode an `asm' spec for a declaration as a register name.
760 Return the register number, or -1 if nothing specified,
761 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
762 or -3 if ASMSPEC is `cc' and is not recognized,
763 or -4 if ASMSPEC is `memory' and is not recognized.
764 Accept an exact spelling or a decimal number.
765 Prefixes such as % are optional. */
768 decode_reg_name (const char *asmspec)
774 /* Get rid of confusing prefixes. */
775 asmspec = strip_reg_name (asmspec);
777 /* Allow a decimal number as a "register name". */
778 for (i = strlen (asmspec) - 1; i >= 0; i--)
779 if (! ISDIGIT (asmspec[i]))
781 if (asmspec[0] != 0 && i < 0)
784 if (i < FIRST_PSEUDO_REGISTER && i >= 0)
790 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
792 && ! strcmp (asmspec, strip_reg_name (reg_names[i])))
795 #ifdef ADDITIONAL_REGISTER_NAMES
797 static const struct { const char *const name; const int number; } table[]
798 = ADDITIONAL_REGISTER_NAMES;
800 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
802 && ! strcmp (asmspec, table[i].name))
803 return table[i].number;
805 #endif /* ADDITIONAL_REGISTER_NAMES */
807 if (!strcmp (asmspec, "memory"))
810 if (!strcmp (asmspec, "cc"))
819 /* Return true if DECL's initializer is suitable for a BSS section. */
822 bss_initializer_p (tree decl)
824 return (DECL_INITIAL (decl) == NULL
825 || DECL_INITIAL (decl) == error_mark_node
826 || (flag_zero_initialized_in_bss
827 /* Leave constant zeroes in .rodata so they
829 && !TREE_READONLY (decl)
830 && initializer_zerop (DECL_INITIAL (decl))));
833 /* Compute the alignment of variable specified by DECL.
834 DONT_OUTPUT_DATA is from assemble_variable. */
837 align_variable (tree decl, bool dont_output_data)
839 unsigned int align = DECL_ALIGN (decl);
841 /* In the case for initialing an array whose length isn't specified,
842 where we have not yet been able to do the layout,
843 figure out the proper alignment now. */
844 if (dont_output_data && DECL_SIZE (decl) == 0
845 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
846 align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
848 /* Some object file formats have a maximum alignment which they support.
849 In particular, a.out format supports a maximum alignment of 4. */
850 if (align > MAX_OFILE_ALIGNMENT)
852 warning (0, "alignment of %q+D is greater than maximum object "
853 "file alignment. Using %d", decl,
854 MAX_OFILE_ALIGNMENT/BITS_PER_UNIT);
855 align = MAX_OFILE_ALIGNMENT;
858 /* On some machines, it is good to increase alignment sometimes. */
859 if (! DECL_USER_ALIGN (decl))
861 #ifdef DATA_ALIGNMENT
862 align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
864 #ifdef CONSTANT_ALIGNMENT
865 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
866 align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl), align);
870 /* Reset the alignment in case we have made it tighter, so we can benefit
871 from it in get_pointer_alignment. */
872 DECL_ALIGN (decl) = align;
875 /* Return the section into which the given VAR_DECL or CONST_DECL
876 should be placed. PREFER_NOSWITCH_P is true if a noswitch
877 section should be used wherever possible. */
880 get_variable_section (tree decl, bool prefer_noswitch_p)
884 /* If the decl has been given an explicit section name, then it
885 isn't common, and shouldn't be handled as such. */
886 if (DECL_COMMON (decl) && DECL_SECTION_NAME (decl) == NULL)
888 if (DECL_THREAD_LOCAL_P (decl))
889 return tls_comm_section;
890 if (TREE_PUBLIC (decl) && bss_initializer_p (decl))
894 if (DECL_INITIAL (decl) == error_mark_node)
895 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
896 else if (DECL_INITIAL (decl))
897 reloc = compute_reloc_for_constant (DECL_INITIAL (decl));
901 resolve_unique_section (decl, reloc, flag_data_sections);
902 if (IN_NAMED_SECTION (decl))
903 return get_named_section (decl, NULL, reloc);
905 if (!DECL_THREAD_LOCAL_P (decl)
906 && !(prefer_noswitch_p && targetm.have_switchable_bss_sections)
907 && bss_initializer_p (decl))
909 if (!TREE_PUBLIC (decl))
910 return lcomm_section;
911 if (bss_noswitch_section)
912 return bss_noswitch_section;
915 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
918 /* Return the block into which object_block DECL should be placed. */
920 static struct object_block *
921 get_block_for_decl (tree decl)
925 if (TREE_CODE (decl) == VAR_DECL)
927 /* The object must be defined in this translation unit. */
928 if (DECL_EXTERNAL (decl))
931 /* There's no point using object blocks for something that is
932 isolated by definition. */
933 if (DECL_ONE_ONLY (decl))
937 /* We can only calculate block offsets if the decl has a known
939 if (DECL_SIZE_UNIT (decl) == NULL)
941 if (!host_integerp (DECL_SIZE_UNIT (decl), 1))
944 /* Find out which section should contain DECL. We cannot put it into
945 an object block if it requires a standalone definition. */
946 if (TREE_CODE (decl) == VAR_DECL)
947 align_variable (decl, 0);
948 sect = get_variable_section (decl, true);
949 if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
952 return get_block_for_section (sect);
955 /* Make sure block symbol SYMBOL is in block BLOCK. */
958 change_symbol_block (rtx symbol, struct object_block *block)
960 if (block != SYMBOL_REF_BLOCK (symbol))
962 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol) < 0);
963 SYMBOL_REF_BLOCK (symbol) = block;
967 /* Return true if it is possible to put DECL in an object_block. */
970 use_blocks_for_decl_p (tree decl)
972 /* Only data DECLs can be placed into object blocks. */
973 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != CONST_DECL)
976 /* Detect decls created by dw2_force_const_mem. Such decls are
977 special because DECL_INITIAL doesn't specify the decl's true value.
978 dw2_output_indirect_constants will instead call assemble_variable
979 with dont_output_data set to 1 and then print the contents itself. */
980 if (DECL_INITIAL (decl) == decl)
983 /* If this decl is an alias, then we don't want to emit a definition. */
984 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl)))
990 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
991 have static storage duration. In other words, it should not be an
992 automatic variable, including PARM_DECLs.
994 There is, however, one exception: this function handles variables
995 explicitly placed in a particular register by the user.
997 This is never called for PARM_DECL nodes. */
1000 make_decl_rtl (tree decl)
1002 const char *name = 0;
1006 /* Check that we are not being given an automatic variable. */
1007 gcc_assert (TREE_CODE (decl) != PARM_DECL
1008 && TREE_CODE (decl) != RESULT_DECL);
1010 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1011 gcc_assert (TREE_CODE (decl) != VAR_DECL
1012 || TREE_STATIC (decl)
1013 || TREE_PUBLIC (decl)
1014 || DECL_EXTERNAL (decl)
1015 || DECL_REGISTER (decl));
1017 /* And that we were not given a type or a label. */
1018 gcc_assert (TREE_CODE (decl) != TYPE_DECL
1019 && TREE_CODE (decl) != LABEL_DECL);
1021 /* For a duplicate declaration, we can be called twice on the
1022 same DECL node. Don't discard the RTL already made. */
1023 if (DECL_RTL_SET_P (decl))
1025 /* If the old RTL had the wrong mode, fix the mode. */
1026 x = DECL_RTL (decl);
1027 if (GET_MODE (x) != DECL_MODE (decl))
1028 SET_DECL_RTL (decl, adjust_address_nv (x, DECL_MODE (decl), 0));
1030 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1033 /* ??? Another way to do this would be to maintain a hashed
1034 table of such critters. Instead of adding stuff to a DECL
1035 to give certain attributes to it, we could use an external
1036 hash map from DECL to set of attributes. */
1038 /* Let the target reassign the RTL if it wants.
1039 This is necessary, for example, when one machine specific
1040 decl attribute overrides another. */
1041 targetm.encode_section_info (decl, DECL_RTL (decl), false);
1043 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1044 on the new decl information. */
1046 && GET_CODE (XEXP (x, 0)) == SYMBOL_REF
1047 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x, 0)))
1048 change_symbol_block (XEXP (x, 0), get_block_for_decl (decl));
1050 /* Make this function static known to the mudflap runtime. */
1051 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1052 mudflap_enqueue_decl (decl);
1057 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1059 if (name[0] != '*' && TREE_CODE (decl) != FUNCTION_DECL
1060 && DECL_REGISTER (decl))
1062 error ("register name not specified for %q+D", decl);
1064 else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1066 const char *asmspec = name+1;
1067 reg_number = decode_reg_name (asmspec);
1068 /* First detect errors in declaring global registers. */
1069 if (reg_number == -1)
1070 error ("register name not specified for %q+D", decl);
1071 else if (reg_number < 0)
1072 error ("invalid register name for %q+D", decl);
1073 else if (TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
1074 error ("data type of %q+D isn%'t suitable for a register",
1076 else if (! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl))))
1077 error ("register specified for %q+D isn%'t suitable for data type",
1079 /* Now handle properly declared static register variables. */
1084 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
1086 DECL_INITIAL (decl) = 0;
1087 error ("global register variable has initial value");
1089 if (TREE_THIS_VOLATILE (decl))
1090 warning (OPT_Wvolatile_register_var,
1091 "optimization may eliminate reads and/or "
1092 "writes to register variables");
1094 /* If the user specified one of the eliminables registers here,
1095 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1096 confused with that register and be eliminated. This usage is
1097 somewhat suspect... */
1099 SET_DECL_RTL (decl, gen_rtx_raw_REG (DECL_MODE (decl), reg_number));
1100 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
1101 REG_USERVAR_P (DECL_RTL (decl)) = 1;
1103 if (TREE_STATIC (decl))
1105 /* Make this register global, so not usable for anything
1107 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1108 name = IDENTIFIER_POINTER (DECL_NAME (decl));
1109 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
1111 nregs = hard_regno_nregs[reg_number][DECL_MODE (decl)];
1113 globalize_reg (reg_number + --nregs);
1116 /* As a register variable, it has no section. */
1120 /* Now handle ordinary static variables and functions (in memory).
1121 Also handle vars declared register invalidly. */
1122 else if (name[0] == '*')
1124 #ifdef REGISTER_PREFIX
1125 if (strlen (REGISTER_PREFIX) != 0)
1127 reg_number = decode_reg_name (name);
1128 if (reg_number >= 0 || reg_number == -3)
1129 error ("register name given for non-register variable %q+D", decl);
1134 /* Specifying a section attribute on a variable forces it into a
1135 non-.bss section, and thus it cannot be common. */
1136 if (TREE_CODE (decl) == VAR_DECL
1137 && DECL_SECTION_NAME (decl) != NULL_TREE
1138 && DECL_INITIAL (decl) == NULL_TREE
1139 && DECL_COMMON (decl))
1140 DECL_COMMON (decl) = 0;
1142 /* Variables can't be both common and weak. */
1143 if (TREE_CODE (decl) == VAR_DECL && DECL_WEAK (decl))
1144 DECL_COMMON (decl) = 0;
1146 if (use_object_blocks_p () && use_blocks_for_decl_p (decl))
1147 x = create_block_symbol (name, get_block_for_decl (decl), -1);
1149 x = gen_rtx_SYMBOL_REF (Pmode, name);
1150 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
1151 SET_SYMBOL_REF_DECL (x, decl);
1153 x = gen_rtx_MEM (DECL_MODE (decl), x);
1154 if (TREE_CODE (decl) != FUNCTION_DECL)
1155 set_mem_attributes (x, decl, 1);
1156 SET_DECL_RTL (decl, x);
1158 /* Optionally set flags or add text to the name to record information
1159 such as that it is a function name.
1160 If the name is changed, the macro ASM_OUTPUT_LABELREF
1161 will have to know how to strip this information. */
1162 targetm.encode_section_info (decl, DECL_RTL (decl), true);
1164 /* Make this function static known to the mudflap runtime. */
1165 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1166 mudflap_enqueue_decl (decl);
1169 /* Output a string of literal assembler code
1170 for an `asm' keyword used between functions. */
1173 assemble_asm (tree string)
1177 if (TREE_CODE (string) == ADDR_EXPR)
1178 string = TREE_OPERAND (string, 0);
1180 fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string));
1183 /* Record an element in the table of global destructors. SYMBOL is
1184 a SYMBOL_REF of the function to be called; PRIORITY is a number
1185 between 0 and MAX_INIT_PRIORITY. */
1188 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED,
1189 int priority ATTRIBUTE_UNUSED)
1191 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1192 /* Tell GNU LD that this is part of the static destructor set.
1193 This will work for any system that uses stabs, most usefully
1195 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1196 dbxout_stab_value_label (XSTR (symbol, 0));
1198 sorry ("global destructors not supported on this target");
1203 default_named_section_asm_out_destructor (rtx symbol, int priority)
1205 const char *section = ".dtors";
1208 /* ??? This only works reliably with the GNU linker. */
1209 if (priority != DEFAULT_INIT_PRIORITY)
1211 sprintf (buf, ".dtors.%.5u",
1212 /* Invert the numbering so the linker puts us in the proper
1213 order; constructors are run from right to left, and the
1214 linker sorts in increasing order. */
1215 MAX_INIT_PRIORITY - priority);
1219 switch_to_section (get_section (section, SECTION_WRITE, NULL));
1220 assemble_align (POINTER_SIZE);
1221 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1224 #ifdef DTORS_SECTION_ASM_OP
1226 default_dtor_section_asm_out_destructor (rtx symbol,
1227 int priority ATTRIBUTE_UNUSED)
1229 switch_to_section (dtors_section);
1230 assemble_align (POINTER_SIZE);
1231 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1235 /* Likewise for global constructors. */
1238 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED,
1239 int priority ATTRIBUTE_UNUSED)
1241 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1242 /* Tell GNU LD that this is part of the static destructor set.
1243 This will work for any system that uses stabs, most usefully
1245 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1246 dbxout_stab_value_label (XSTR (symbol, 0));
1248 sorry ("global constructors not supported on this target");
1253 default_named_section_asm_out_constructor (rtx symbol, int priority)
1255 const char *section = ".ctors";
1258 /* ??? This only works reliably with the GNU linker. */
1259 if (priority != DEFAULT_INIT_PRIORITY)
1261 sprintf (buf, ".ctors.%.5u",
1262 /* Invert the numbering so the linker puts us in the proper
1263 order; constructors are run from right to left, and the
1264 linker sorts in increasing order. */
1265 MAX_INIT_PRIORITY - priority);
1269 switch_to_section (get_section (section, SECTION_WRITE, NULL));
1270 assemble_align (POINTER_SIZE);
1271 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1274 #ifdef CTORS_SECTION_ASM_OP
1276 default_ctor_section_asm_out_constructor (rtx symbol,
1277 int priority ATTRIBUTE_UNUSED)
1279 switch_to_section (ctors_section);
1280 assemble_align (POINTER_SIZE);
1281 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1285 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1286 a nonzero value if the constant pool should be output before the
1287 start of the function, or a zero value if the pool should output
1288 after the end of the function. The default is to put it before the
1291 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1292 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1295 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1296 to be output to assembler.
1297 Set first_global_object_name and weak_global_object_name as appropriate. */
1300 notice_global_symbol (tree decl)
1302 const char **type = &first_global_object_name;
1304 if (first_global_object_name
1305 || !TREE_PUBLIC (decl)
1306 || DECL_EXTERNAL (decl)
1307 || !DECL_NAME (decl)
1308 || (TREE_CODE (decl) != FUNCTION_DECL
1309 && (TREE_CODE (decl) != VAR_DECL
1310 || (DECL_COMMON (decl)
1311 && (DECL_INITIAL (decl) == 0
1312 || DECL_INITIAL (decl) == error_mark_node))))
1313 || !MEM_P (DECL_RTL (decl)))
1316 /* We win when global object is found, but it is useful to know about weak
1317 symbol as well so we can produce nicer unique names. */
1318 if (DECL_WEAK (decl) || DECL_ONE_ONLY (decl))
1319 type = &weak_global_object_name;
1325 rtx decl_rtl = DECL_RTL (decl);
1327 p = targetm.strip_name_encoding (XSTR (XEXP (decl_rtl, 0), 0));
1328 name = ggc_strdup (p);
1334 /* Output assembler code for the constant pool of a function and associated
1335 with defining the name of the function. DECL describes the function.
1336 NAME is the function's name. For the constant pool, we use the current
1337 constant pool data. */
1340 assemble_start_function (tree decl, const char *fnname)
1343 char tmp_label[100];
1344 bool hot_label_written = false;
1346 cfun->unlikely_text_section_name = NULL;
1348 first_function_block_is_cold = false;
1349 if (flag_reorder_blocks_and_partition)
1351 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
1352 cfun->hot_section_label = ggc_strdup (tmp_label);
1353 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDB", const_labelno);
1354 cfun->cold_section_label = ggc_strdup (tmp_label);
1355 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTE", const_labelno);
1356 cfun->hot_section_end_label = ggc_strdup (tmp_label);
1357 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDE", const_labelno);
1358 cfun->cold_section_end_label = ggc_strdup (tmp_label);
1363 cfun->hot_section_label = NULL;
1364 cfun->cold_section_label = NULL;
1365 cfun->hot_section_end_label = NULL;
1366 cfun->cold_section_end_label = NULL;
1369 /* The following code does not need preprocessing in the assembler. */
1373 if (CONSTANT_POOL_BEFORE_FUNCTION)
1374 output_constant_pool (fnname, decl);
1376 resolve_unique_section (decl, 0, flag_function_sections);
1378 /* Make sure the not and cold text (code) sections are properly
1379 aligned. This is necessary here in the case where the function
1380 has both hot and cold sections, because we don't want to re-set
1381 the alignment when the section switch happens mid-function. */
1383 if (flag_reorder_blocks_and_partition)
1385 switch_to_section (unlikely_text_section ());
1386 assemble_align (FUNCTION_BOUNDARY);
1387 ASM_OUTPUT_LABEL (asm_out_file, cfun->cold_section_label);
1389 /* When the function starts with a cold section, we need to explicitly
1390 align the hot section and write out the hot section label.
1391 But if the current function is a thunk, we do not have a CFG. */
1392 if (!current_function_is_thunk
1393 && BB_PARTITION (ENTRY_BLOCK_PTR->next_bb) == BB_COLD_PARTITION)
1395 switch_to_section (text_section);
1396 assemble_align (FUNCTION_BOUNDARY);
1397 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_label);
1398 hot_label_written = true;
1399 first_function_block_is_cold = true;
1402 else if (DECL_SECTION_NAME (decl))
1404 /* Calls to function_section rely on first_function_block_is_cold
1405 being accurate. The first block may be cold even if we aren't
1406 doing partitioning, if the entire function was decided by
1407 choose_function_section (predict.c) to be cold. */
1409 initialize_cold_section_name ();
1411 if (cfun->unlikely_text_section_name
1412 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
1413 cfun->unlikely_text_section_name) == 0)
1414 first_function_block_is_cold = true;
1417 in_cold_section_p = first_function_block_is_cold;
1419 /* Switch to the correct text section for the start of the function. */
1421 switch_to_section (function_section (decl));
1422 if (flag_reorder_blocks_and_partition
1423 && !hot_label_written)
1424 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_label);
1426 /* Tell assembler to move to target machine's alignment for functions. */
1427 align = floor_log2 (FUNCTION_BOUNDARY / BITS_PER_UNIT);
1428 if (align < force_align_functions_log)
1429 align = force_align_functions_log;
1432 ASM_OUTPUT_ALIGN (asm_out_file, align);
1435 /* Handle a user-specified function alignment.
1436 Note that we still need to align to FUNCTION_BOUNDARY, as above,
1437 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1438 if (align_functions_log > align
1439 && cfun->function_frequency != FUNCTION_FREQUENCY_UNLIKELY_EXECUTED)
1441 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1442 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
1443 align_functions_log, align_functions - 1);
1445 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1449 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1450 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1453 (*debug_hooks->begin_function) (decl);
1455 /* Make function name accessible from other files, if appropriate. */
1457 if (TREE_PUBLIC (decl))
1459 notice_global_symbol (decl);
1461 globalize_decl (decl);
1463 maybe_assemble_visibility (decl);
1466 if (DECL_PRESERVE_P (decl))
1467 targetm.asm_out.mark_decl_preserved (fnname);
1469 /* Do any machine/system dependent processing of the function name. */
1470 #ifdef ASM_DECLARE_FUNCTION_NAME
1471 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1473 /* Standard thing is just output label for the function. */
1474 ASM_OUTPUT_LABEL (asm_out_file, fnname);
1475 #endif /* ASM_DECLARE_FUNCTION_NAME */
1478 /* Output assembler code associated with defining the size of the
1479 function. DECL describes the function. NAME is the function's name. */
1482 assemble_end_function (tree decl, const char *fnname ATTRIBUTE_UNUSED)
1484 #ifdef ASM_DECLARE_FUNCTION_SIZE
1485 /* We could have switched section in the middle of the function. */
1486 if (flag_reorder_blocks_and_partition)
1487 switch_to_section (function_section (decl));
1488 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1490 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1492 output_constant_pool (fnname, decl);
1493 switch_to_section (function_section (decl)); /* need to switch back */
1495 /* Output labels for end of hot/cold text sections (to be used by
1497 if (flag_reorder_blocks_and_partition)
1499 section *save_text_section;
1501 save_text_section = in_section;
1502 switch_to_section (unlikely_text_section ());
1503 ASM_OUTPUT_LABEL (asm_out_file, cfun->cold_section_end_label);
1504 if (first_function_block_is_cold)
1505 switch_to_section (text_section);
1507 switch_to_section (function_section (decl));
1508 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_end_label);
1509 switch_to_section (save_text_section);
1513 /* Assemble code to leave SIZE bytes of zeros. */
1516 assemble_zeros (unsigned HOST_WIDE_INT size)
1518 /* Do no output if -fsyntax-only. */
1519 if (flag_syntax_only)
1522 #ifdef ASM_NO_SKIP_IN_TEXT
1523 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1524 so we must output 0s explicitly in the text section. */
1525 if (ASM_NO_SKIP_IN_TEXT && (in_section->common.flags & SECTION_CODE) != 0)
1527 unsigned HOST_WIDE_INT i;
1528 for (i = 0; i < size; i++)
1529 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1534 ASM_OUTPUT_SKIP (asm_out_file, size);
1537 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1540 assemble_align (int align)
1542 if (align > BITS_PER_UNIT)
1544 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1548 /* Assemble a string constant with the specified C string as contents. */
1551 assemble_string (const char *p, int size)
1556 /* If the string is very long, split it up. */
1560 int thissize = size - pos;
1561 if (thissize > maximum)
1564 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1572 /* A noswitch_section_callback for lcomm_section. */
1575 emit_local (tree decl ATTRIBUTE_UNUSED,
1576 const char *name ATTRIBUTE_UNUSED,
1577 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1578 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1580 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1581 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name,
1582 size, DECL_ALIGN (decl));
1584 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1585 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, DECL_ALIGN (decl));
1588 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1593 /* A noswitch_section_callback for bss_noswitch_section. */
1595 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
1597 emit_bss (tree decl ATTRIBUTE_UNUSED,
1598 const char *name ATTRIBUTE_UNUSED,
1599 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1600 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1602 #if defined ASM_OUTPUT_ALIGNED_BSS
1603 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size, DECL_ALIGN (decl));
1606 ASM_OUTPUT_BSS (asm_out_file, decl, name, size, rounded);
1612 /* A noswitch_section_callback for comm_section. */
1615 emit_common (tree decl ATTRIBUTE_UNUSED,
1616 const char *name ATTRIBUTE_UNUSED,
1617 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1618 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1620 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1621 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name,
1622 size, DECL_ALIGN (decl));
1624 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1625 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, DECL_ALIGN (decl));
1628 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded);
1633 /* A noswitch_section_callback for tls_comm_section. */
1636 emit_tls_common (tree decl ATTRIBUTE_UNUSED,
1637 const char *name ATTRIBUTE_UNUSED,
1638 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1639 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1641 #ifdef ASM_OUTPUT_TLS_COMMON
1642 ASM_OUTPUT_TLS_COMMON (asm_out_file, decl, name, size);
1645 sorry ("thread-local COMMON data not implemented");
1650 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1651 NAME is the name of DECL's SYMBOL_REF. */
1654 assemble_noswitch_variable (tree decl, const char *name, section *sect)
1656 unsigned HOST_WIDE_INT size, rounded;
1658 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
1661 /* Don't allocate zero bytes of common,
1662 since that means "undefined external" in the linker. */
1666 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1667 so that each uninitialized object starts on such a boundary. */
1668 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
1669 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1670 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1672 if (!sect->noswitch.callback (decl, name, size, rounded)
1673 && (unsigned HOST_WIDE_INT) DECL_ALIGN_UNIT (decl) > rounded)
1674 warning (0, "requested alignment for %q+D is greater than "
1675 "implemented alignment of %wu", decl, rounded);
1678 /* A subroutine of assemble_variable. Output the label and contents of
1679 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1680 is as for assemble_variable. */
1683 assemble_variable_contents (tree decl, const char *name,
1684 bool dont_output_data)
1686 /* Do any machine/system dependent processing of the object. */
1687 #ifdef ASM_DECLARE_OBJECT_NAME
1688 last_assemble_variable_decl = decl;
1689 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
1691 /* Standard thing is just output label for the object. */
1692 ASM_OUTPUT_LABEL (asm_out_file, name);
1693 #endif /* ASM_DECLARE_OBJECT_NAME */
1695 if (!dont_output_data)
1697 if (DECL_INITIAL (decl)
1698 && DECL_INITIAL (decl) != error_mark_node
1699 && !initializer_zerop (DECL_INITIAL (decl)))
1700 /* Output the actual data. */
1701 output_constant (DECL_INITIAL (decl),
1702 tree_low_cst (DECL_SIZE_UNIT (decl), 1),
1705 /* Leave space for it. */
1706 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl), 1));
1710 /* Assemble everything that is needed for a variable or function declaration.
1711 Not used for automatic variables, and not used for function definitions.
1712 Should not be called for variables of incomplete structure type.
1714 TOP_LEVEL is nonzero if this variable has file scope.
1715 AT_END is nonzero if this is the special handling, at end of compilation,
1716 to define things that have had only tentative definitions.
1717 DONT_OUTPUT_DATA if nonzero means don't actually output the
1718 initial value (that will be done by the caller). */
1721 assemble_variable (tree decl, int top_level ATTRIBUTE_UNUSED,
1722 int at_end ATTRIBUTE_UNUSED, int dont_output_data)
1725 rtx decl_rtl, symbol;
1728 if (lang_hooks.decls.prepare_assemble_variable)
1729 lang_hooks.decls.prepare_assemble_variable (decl);
1731 last_assemble_variable_decl = 0;
1733 /* Normally no need to say anything here for external references,
1734 since assemble_external is called by the language-specific code
1735 when a declaration is first seen. */
1737 if (DECL_EXTERNAL (decl))
1740 /* Output no assembler code for a function declaration.
1741 Only definitions of functions output anything. */
1743 if (TREE_CODE (decl) == FUNCTION_DECL)
1746 /* Do nothing for global register variables. */
1747 if (DECL_RTL_SET_P (decl) && REG_P (DECL_RTL (decl)))
1749 TREE_ASM_WRITTEN (decl) = 1;
1753 /* If type was incomplete when the variable was declared,
1754 see if it is complete now. */
1756 if (DECL_SIZE (decl) == 0)
1757 layout_decl (decl, 0);
1759 /* Still incomplete => don't allocate it; treat the tentative defn
1760 (which is what it must have been) as an `extern' reference. */
1762 if (!dont_output_data && DECL_SIZE (decl) == 0)
1764 error ("storage size of %q+D isn%'t known", decl);
1765 TREE_ASM_WRITTEN (decl) = 1;
1769 /* The first declaration of a variable that comes through this function
1770 decides whether it is global (in C, has external linkage)
1771 or local (in C, has internal linkage). So do nothing more
1772 if this function has already run. */
1774 if (TREE_ASM_WRITTEN (decl))
1777 /* Make sure targetm.encode_section_info is invoked before we set
1779 decl_rtl = DECL_RTL (decl);
1781 TREE_ASM_WRITTEN (decl) = 1;
1783 /* Do no output if -fsyntax-only. */
1784 if (flag_syntax_only)
1789 if (! dont_output_data
1790 && ! host_integerp (DECL_SIZE_UNIT (decl), 1))
1792 error ("size of variable %q+D is too large", decl);
1796 gcc_assert (MEM_P (decl_rtl));
1797 gcc_assert (GET_CODE (XEXP (decl_rtl, 0)) == SYMBOL_REF);
1798 symbol = XEXP (decl_rtl, 0);
1799 name = XSTR (symbol, 0);
1800 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
1801 notice_global_symbol (decl);
1803 /* Compute the alignment of this data. */
1805 align_variable (decl, dont_output_data);
1806 set_mem_align (decl_rtl, DECL_ALIGN (decl));
1808 if (TREE_PUBLIC (decl))
1809 maybe_assemble_visibility (decl);
1811 if (DECL_PRESERVE_P (decl))
1812 targetm.asm_out.mark_decl_preserved (name);
1814 /* First make the assembler name(s) global if appropriate. */
1815 sect = get_variable_section (decl, false);
1816 if (TREE_PUBLIC (decl)
1818 && (sect->common.flags & SECTION_COMMON) == 0)
1819 globalize_decl (decl);
1821 /* Output any data that we will need to use the address of. */
1822 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
1823 output_addressed_constants (DECL_INITIAL (decl));
1825 /* dbxout.c needs to know this. */
1826 if (sect && (sect->common.flags & SECTION_CODE) != 0)
1827 DECL_IN_TEXT_SECTION (decl) = 1;
1829 /* If the decl is part of an object_block, make sure that the decl
1830 has been positioned within its block, but do not write out its
1831 definition yet. output_object_blocks will do that later. */
1832 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
1834 gcc_assert (!dont_output_data);
1835 place_block_symbol (symbol);
1837 else if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
1838 assemble_noswitch_variable (decl, name, sect);
1841 switch_to_section (sect);
1842 if (DECL_ALIGN (decl) > BITS_PER_UNIT)
1843 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (DECL_ALIGN_UNIT (decl)));
1844 assemble_variable_contents (decl, name, dont_output_data);
1848 /* Return 1 if type TYPE contains any pointers. */
1851 contains_pointers_p (tree type)
1853 switch (TREE_CODE (type))
1856 case REFERENCE_TYPE:
1857 /* I'm not sure whether OFFSET_TYPE needs this treatment,
1858 so I'll play safe and return 1. */
1864 case QUAL_UNION_TYPE:
1867 /* For a type that has fields, see if the fields have pointers. */
1868 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
1869 if (TREE_CODE (fields) == FIELD_DECL
1870 && contains_pointers_p (TREE_TYPE (fields)))
1876 /* An array type contains pointers if its element type does. */
1877 return contains_pointers_p (TREE_TYPE (type));
1884 /* In unit-at-a-time mode, we delay assemble_external processing until
1885 the compilation unit is finalized. This is the best we can do for
1886 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
1887 it all the way to final. See PR 17982 for further discussion. */
1888 static GTY(()) tree pending_assemble_externals;
1890 #ifdef ASM_OUTPUT_EXTERNAL
1891 /* True if DECL is a function decl for which no out-of-line copy exists.
1892 It is assumed that DECL's assembler name has been set. */
1895 incorporeal_function_p (tree decl)
1897 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1901 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
1902 && DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA)
1905 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1906 if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0)
1912 /* Actually do the tests to determine if this is necessary, and invoke
1913 ASM_OUTPUT_EXTERNAL. */
1915 assemble_external_real (tree decl)
1917 rtx rtl = DECL_RTL (decl);
1919 if (MEM_P (rtl) && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
1920 && !SYMBOL_REF_USED (XEXP (rtl, 0))
1921 && !incorporeal_function_p (decl))
1923 /* Some systems do require some output. */
1924 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
1925 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
1931 process_pending_assemble_externals (void)
1933 #ifdef ASM_OUTPUT_EXTERNAL
1935 for (list = pending_assemble_externals; list; list = TREE_CHAIN (list))
1936 assemble_external_real (TREE_VALUE (list));
1938 pending_assemble_externals = 0;
1942 /* Output something to declare an external symbol to the assembler.
1943 (Most assemblers don't need this, so we normally output nothing.)
1944 Do nothing if DECL is not external. */
1947 assemble_external (tree decl ATTRIBUTE_UNUSED)
1949 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
1950 main body of this code is only rarely exercised. To provide some
1951 testing, on all platforms, we make sure that the ASM_OUT_FILE is
1952 open. If it's not, we should not be calling this function. */
1953 gcc_assert (asm_out_file);
1955 #ifdef ASM_OUTPUT_EXTERNAL
1956 if (!DECL_P (decl) || !DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
1959 /* We want to output external symbols at very last to check if they
1960 are references or not. */
1961 pending_assemble_externals = tree_cons (0, decl,
1962 pending_assemble_externals);
1966 /* Similar, for calling a library function FUN. */
1969 assemble_external_libcall (rtx fun)
1971 /* Declare library function name external when first used, if nec. */
1972 if (! SYMBOL_REF_USED (fun))
1974 SYMBOL_REF_USED (fun) = 1;
1975 targetm.asm_out.external_libcall (fun);
1979 /* Assemble a label named NAME. */
1982 assemble_label (const char *name)
1984 ASM_OUTPUT_LABEL (asm_out_file, name);
1987 /* Set the symbol_referenced flag for ID. */
1989 mark_referenced (tree id)
1991 TREE_SYMBOL_REFERENCED (id) = 1;
1994 /* Set the symbol_referenced flag for DECL and notify callgraph. */
1996 mark_decl_referenced (tree decl)
1998 if (TREE_CODE (decl) == FUNCTION_DECL)
2000 /* Extern inline functions don't become needed when referenced.
2001 If we know a method will be emitted in other TU and no new
2002 functions can be marked reachable, just use the external
2004 struct cgraph_node *node = cgraph_node (decl);
2005 if (!DECL_EXTERNAL (decl)
2006 && (!node->local.vtable_method || !cgraph_global_info_ready
2007 || !node->local.finalized))
2008 cgraph_mark_needed_node (node);
2010 else if (TREE_CODE (decl) == VAR_DECL)
2012 struct cgraph_varpool_node *node = cgraph_varpool_node (decl);
2013 cgraph_varpool_mark_needed_node (node);
2014 /* C++ frontend use mark_decl_references to force COMDAT variables
2015 to be output that might appear dead otherwise. */
2016 node->force_output = true;
2018 /* else do nothing - we can get various sorts of CST nodes here,
2019 which do not need to be marked. */
2023 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2024 until we find an identifier that is not itself a transparent alias.
2025 Modify the alias passed to it by reference (and all aliases on the
2026 way to the ultimate target), such that they do not have to be
2027 followed again, and return the ultimate target of the alias
2031 ultimate_transparent_alias_target (tree *alias)
2033 tree target = *alias;
2035 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
2037 gcc_assert (TREE_CHAIN (target));
2038 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
2039 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
2040 && ! TREE_CHAIN (target));
2047 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2048 starts with a *, the rest of NAME is output verbatim. Otherwise
2049 NAME is transformed in a target-specific way (usually by the
2050 addition of an underscore). */
2053 assemble_name_raw (FILE *file, const char *name)
2056 fputs (&name[1], file);
2058 ASM_OUTPUT_LABELREF (file, name);
2061 /* Like assemble_name_raw, but should be used when NAME might refer to
2062 an entity that is also represented as a tree (like a function or
2063 variable). If NAME does refer to such an entity, that entity will
2064 be marked as referenced. */
2067 assemble_name (FILE *file, const char *name)
2069 const char *real_name;
2072 real_name = targetm.strip_name_encoding (name);
2074 id = maybe_get_identifier (real_name);
2079 mark_referenced (id);
2080 ultimate_transparent_alias_target (&id);
2082 name = IDENTIFIER_POINTER (id);
2083 gcc_assert (! TREE_CHAIN (id));
2086 assemble_name_raw (file, name);
2089 /* Allocate SIZE bytes writable static space with a gensym name
2090 and return an RTX to refer to its address. */
2093 assemble_static_space (unsigned HOST_WIDE_INT size)
2096 const char *namestring;
2099 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2101 namestring = ggc_strdup (name);
2103 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2104 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2106 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2107 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2110 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2111 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2114 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2115 so that each uninitialized object starts on such a boundary. */
2116 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2117 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2118 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2119 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2120 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2121 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2128 /* Assemble the static constant template for function entry trampolines.
2129 This is done at most once per compilation.
2130 Returns an RTX for the address of the template. */
2132 static GTY(()) rtx initial_trampoline;
2134 #ifdef TRAMPOLINE_TEMPLATE
2136 assemble_trampoline_template (void)
2143 if (initial_trampoline)
2144 return initial_trampoline;
2146 /* By default, put trampoline templates in read-only data section. */
2148 #ifdef TRAMPOLINE_SECTION
2149 switch_to_section (TRAMPOLINE_SECTION);
2151 switch_to_section (readonly_data_section);
2154 /* Write the assembler code to define one. */
2155 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2158 ASM_OUTPUT_ALIGN (asm_out_file, align);
2161 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2162 TRAMPOLINE_TEMPLATE (asm_out_file);
2164 /* Record the rtl to refer to it. */
2165 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2166 name = ggc_strdup (label);
2167 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2168 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2170 initial_trampoline = gen_rtx_MEM (BLKmode, symbol);
2171 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2173 return initial_trampoline;
2177 /* A and B are either alignments or offsets. Return the minimum alignment
2178 that may be assumed after adding the two together. */
2180 static inline unsigned
2181 min_align (unsigned int a, unsigned int b)
2183 return (a | b) & -(a | b);
2186 /* Return the assembler directive for creating a given kind of integer
2187 object. SIZE is the number of bytes in the object and ALIGNED_P
2188 indicates whether it is known to be aligned. Return NULL if the
2189 assembly dialect has no such directive.
2191 The returned string should be printed at the start of a new line and
2192 be followed immediately by the object's initial value. */
2195 integer_asm_op (int size, int aligned_p)
2197 struct asm_int_op *ops;
2200 ops = &targetm.asm_out.aligned_op;
2202 ops = &targetm.asm_out.unaligned_op;
2207 return targetm.asm_out.byte_op;
2221 /* Use directive OP to assemble an integer object X. Print OP at the
2222 start of the line, followed immediately by the value of X. */
2225 assemble_integer_with_op (const char *op, rtx x)
2227 fputs (op, asm_out_file);
2228 output_addr_const (asm_out_file, x);
2229 fputc ('\n', asm_out_file);
2232 /* The default implementation of the asm_out.integer target hook. */
2235 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2236 unsigned int size ATTRIBUTE_UNUSED,
2237 int aligned_p ATTRIBUTE_UNUSED)
2239 const char *op = integer_asm_op (size, aligned_p);
2240 /* Avoid GAS bugs for large values. Specifically negative values whose
2241 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2242 if (size > UNITS_PER_WORD && size > POINTER_SIZE / BITS_PER_UNIT)
2244 return op && (assemble_integer_with_op (op, x), true);
2247 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2248 the alignment of the integer in bits. Return 1 if we were able to output
2249 the constant, otherwise 0. We must be able to output the constant,
2250 if FORCE is nonzero. */
2253 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2257 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2259 /* See if the target hook can handle this kind of object. */
2260 if (targetm.asm_out.integer (x, size, aligned_p))
2263 /* If the object is a multi-byte one, try splitting it up. Split
2264 it into words it if is multi-word, otherwise split it into bytes. */
2267 enum machine_mode omode, imode;
2268 unsigned int subalign;
2269 unsigned int subsize, i;
2271 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2272 subalign = MIN (align, subsize * BITS_PER_UNIT);
2273 omode = mode_for_size (subsize * BITS_PER_UNIT, MODE_INT, 0);
2274 imode = mode_for_size (size * BITS_PER_UNIT, MODE_INT, 0);
2276 for (i = 0; i < size; i += subsize)
2278 rtx partial = simplify_subreg (omode, x, imode, i);
2279 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2285 /* If we've printed some of it, but not all of it, there's no going
2290 gcc_assert (!force);
2296 assemble_real (REAL_VALUE_TYPE d, enum machine_mode mode, unsigned int align)
2298 long data[4] = {0, 0, 0, 0};
2300 int bitsize, nelts, nunits, units_per;
2302 /* This is hairy. We have a quantity of known size. real_to_target
2303 will put it into an array of *host* longs, 32 bits per element
2304 (even if long is more than 32 bits). We need to determine the
2305 number of array elements that are occupied (nelts) and the number
2306 of *target* min-addressable units that will be occupied in the
2307 object file (nunits). We cannot assume that 32 divides the
2308 mode's bitsize (size * BITS_PER_UNIT) evenly.
2310 size * BITS_PER_UNIT is used here to make sure that padding bits
2311 (which might appear at either end of the value; real_to_target
2312 will include the padding bits in its output array) are included. */
2314 nunits = GET_MODE_SIZE (mode);
2315 bitsize = nunits * BITS_PER_UNIT;
2316 nelts = CEIL (bitsize, 32);
2317 units_per = 32 / BITS_PER_UNIT;
2319 real_to_target (data, &d, mode);
2321 /* Put out the first word with the specified alignment. */
2322 assemble_integer (GEN_INT (data[0]), MIN (nunits, units_per), align, 1);
2323 nunits -= units_per;
2325 /* Subsequent words need only 32-bit alignment. */
2326 align = min_align (align, 32);
2328 for (i = 1; i < nelts; i++)
2330 assemble_integer (GEN_INT (data[i]), MIN (nunits, units_per), align, 1);
2331 nunits -= units_per;
2335 /* Given an expression EXP with a constant value,
2336 reduce it to the sum of an assembler symbol and an integer.
2337 Store them both in the structure *VALUE.
2338 EXP must be reducible. */
2340 struct addr_const GTY(())
2343 HOST_WIDE_INT offset;
2347 decode_addr_const (tree exp, struct addr_const *value)
2349 tree target = TREE_OPERAND (exp, 0);
2355 if (TREE_CODE (target) == COMPONENT_REF
2356 && host_integerp (byte_position (TREE_OPERAND (target, 1)), 0))
2359 offset += int_byte_position (TREE_OPERAND (target, 1));
2360 target = TREE_OPERAND (target, 0);
2362 else if (TREE_CODE (target) == ARRAY_REF
2363 || TREE_CODE (target) == ARRAY_RANGE_REF)
2365 offset += (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target)), 1)
2366 * tree_low_cst (TREE_OPERAND (target, 1), 0));
2367 target = TREE_OPERAND (target, 0);
2373 switch (TREE_CODE (target))
2377 x = DECL_RTL (target);
2381 x = gen_rtx_MEM (FUNCTION_MODE,
2382 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2390 x = output_constant_def (target, 1);
2397 gcc_assert (MEM_P (x));
2401 value->offset = offset;
2404 /* Uniquize all constants that appear in memory.
2405 Each constant in memory thus far output is recorded
2406 in `const_desc_table'. */
2408 struct constant_descriptor_tree GTY(())
2410 /* A MEM for the constant. */
2413 /* The value of the constant. */
2416 /* Hash of value. Computing the hash from value each time
2417 hashfn is called can't work properly, as that means recursive
2418 use of the hash table during hash table expansion. */
2422 static GTY((param_is (struct constant_descriptor_tree)))
2423 htab_t const_desc_htab;
2425 static struct constant_descriptor_tree * build_constant_desc (tree);
2426 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2428 /* Compute a hash code for a constant expression. */
2431 const_desc_hash (const void *ptr)
2433 return ((struct constant_descriptor_tree *)ptr)->hash;
2437 const_hash_1 (const tree exp)
2442 enum tree_code code = TREE_CODE (exp);
2444 /* Either set P and LEN to the address and len of something to hash and
2445 exit the switch or return a value. */
2450 p = (char *) &TREE_INT_CST (exp);
2451 len = sizeof TREE_INT_CST (exp);
2455 return real_hash (TREE_REAL_CST_PTR (exp));
2458 p = TREE_STRING_POINTER (exp);
2459 len = TREE_STRING_LENGTH (exp);
2463 return (const_hash_1 (TREE_REALPART (exp)) * 5
2464 + const_hash_1 (TREE_IMAGPART (exp)));
2468 unsigned HOST_WIDE_INT idx;
2471 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2473 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
2475 hi = hi * 603 + const_hash_1 (value);
2483 struct addr_const value;
2485 decode_addr_const (exp, &value);
2486 switch (GET_CODE (value.base))
2489 /* Don't hash the address of the SYMBOL_REF;
2490 only use the offset and the symbol name. */
2492 p = XSTR (value.base, 0);
2493 for (i = 0; p[i] != 0; i++)
2494 hi = ((hi * 613) + (unsigned) (p[i]));
2498 hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
2509 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2510 + const_hash_1 (TREE_OPERAND (exp, 1)));
2514 case NON_LVALUE_EXPR:
2515 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2518 /* A language specific constant. Just hash the code. */
2522 /* Compute hashing function. */
2524 for (i = 0; i < len; i++)
2525 hi = ((hi * 613) + (unsigned) (p[i]));
2530 /* Wrapper of compare_constant, for the htab interface. */
2532 const_desc_eq (const void *p1, const void *p2)
2534 const struct constant_descriptor_tree *c1 = p1;
2535 const struct constant_descriptor_tree *c2 = p2;
2536 if (c1->hash != c2->hash)
2538 return compare_constant (c1->value, c2->value);
2541 /* Compare t1 and t2, and return 1 only if they are known to result in
2542 the same bit pattern on output. */
2545 compare_constant (const tree t1, const tree t2)
2547 enum tree_code typecode;
2549 if (t1 == NULL_TREE)
2550 return t2 == NULL_TREE;
2551 if (t2 == NULL_TREE)
2554 if (TREE_CODE (t1) != TREE_CODE (t2))
2557 switch (TREE_CODE (t1))
2560 /* Integer constants are the same only if the same width of type. */
2561 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2563 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2565 return tree_int_cst_equal (t1, t2);
2568 /* Real constants are the same only if the same width of type. */
2569 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2572 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
2575 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2578 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
2579 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
2580 TREE_STRING_LENGTH (t1)));
2583 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
2584 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
2588 VEC(constructor_elt, gc) *v1, *v2;
2589 unsigned HOST_WIDE_INT idx;
2591 typecode = TREE_CODE (TREE_TYPE (t1));
2592 if (typecode != TREE_CODE (TREE_TYPE (t2)))
2595 if (typecode == ARRAY_TYPE)
2597 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
2598 /* For arrays, check that the sizes all match. */
2599 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
2601 || size_1 != int_size_in_bytes (TREE_TYPE (t2)))
2606 /* For record and union constructors, require exact type
2608 if (TREE_TYPE (t1) != TREE_TYPE (t2))
2612 v1 = CONSTRUCTOR_ELTS (t1);
2613 v2 = CONSTRUCTOR_ELTS (t2);
2614 if (VEC_length (constructor_elt, v1)
2615 != VEC_length (constructor_elt, v2))
2618 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
2620 constructor_elt *c1 = VEC_index (constructor_elt, v1, idx);
2621 constructor_elt *c2 = VEC_index (constructor_elt, v2, idx);
2623 /* Check that each value is the same... */
2624 if (!compare_constant (c1->value, c2->value))
2626 /* ... and that they apply to the same fields! */
2627 if (typecode == ARRAY_TYPE)
2629 if (!compare_constant (c1->index, c2->index))
2634 if (c1->index != c2->index)
2645 struct addr_const value1, value2;
2647 decode_addr_const (t1, &value1);
2648 decode_addr_const (t2, &value2);
2649 return (value1.offset == value2.offset
2650 && strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
2656 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
2657 && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
2661 case NON_LVALUE_EXPR:
2662 case VIEW_CONVERT_EXPR:
2663 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
2668 nt1 = lang_hooks.expand_constant (t1);
2669 nt2 = lang_hooks.expand_constant (t2);
2670 if (nt1 != t1 || nt2 != t2)
2671 return compare_constant (nt1, nt2);
2680 /* Make a copy of the whole tree structure for a constant. This
2681 handles the same types of nodes that compare_constant handles. */
2684 copy_constant (tree exp)
2686 switch (TREE_CODE (exp))
2689 /* For ADDR_EXPR, we do not want to copy the decl whose address
2690 is requested. We do want to copy constants though. */
2691 if (CONSTANT_CLASS_P (TREE_OPERAND (exp, 0)))
2692 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2693 copy_constant (TREE_OPERAND (exp, 0)));
2695 return copy_node (exp);
2700 return copy_node (exp);
2703 return build_complex (TREE_TYPE (exp),
2704 copy_constant (TREE_REALPART (exp)),
2705 copy_constant (TREE_IMAGPART (exp)));
2709 return build2 (TREE_CODE (exp), TREE_TYPE (exp),
2710 copy_constant (TREE_OPERAND (exp, 0)),
2711 copy_constant (TREE_OPERAND (exp, 1)));
2715 case NON_LVALUE_EXPR:
2716 case VIEW_CONVERT_EXPR:
2717 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2718 copy_constant (TREE_OPERAND (exp, 0)));
2722 tree copy = copy_node (exp);
2723 VEC(constructor_elt, gc) *v;
2724 unsigned HOST_WIDE_INT idx;
2725 tree purpose, value;
2727 v = VEC_alloc(constructor_elt, gc, VEC_length(constructor_elt,
2728 CONSTRUCTOR_ELTS (exp)));
2729 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, purpose, value)
2731 constructor_elt *ce = VEC_quick_push (constructor_elt, v, NULL);
2732 ce->index = purpose;
2733 ce->value = copy_constant (value);
2735 CONSTRUCTOR_ELTS (copy) = v;
2741 tree t = lang_hooks.expand_constant (exp);
2743 gcc_assert (t != exp);
2744 return copy_constant (t);
2749 /* Return the alignment of constant EXP in bits. */
2752 get_constant_alignment (tree exp)
2756 align = TYPE_ALIGN (TREE_TYPE (exp));
2757 #ifdef CONSTANT_ALIGNMENT
2758 align = CONSTANT_ALIGNMENT (exp, align);
2763 /* Return the section into which constant EXP should be placed. */
2766 get_constant_section (tree exp)
2768 if (IN_NAMED_SECTION (exp))
2769 return get_named_section (exp, NULL, compute_reloc_for_constant (exp));
2771 return targetm.asm_out.select_section (exp,
2772 compute_reloc_for_constant (exp),
2773 get_constant_alignment (exp));
2776 /* Return the size of constant EXP in bytes. */
2778 static HOST_WIDE_INT
2779 get_constant_size (tree exp)
2783 size = int_size_in_bytes (TREE_TYPE (exp));
2784 if (TREE_CODE (exp) == STRING_CST)
2785 size = MAX (TREE_STRING_LENGTH (exp), size);
2789 /* Subroutine of output_constant_def:
2790 No constant equal to EXP is known to have been output.
2791 Make a constant descriptor to enter EXP in the hash table.
2792 Assign the label number and construct RTL to refer to the
2793 constant's location in memory.
2794 Caller is responsible for updating the hash table. */
2796 static struct constant_descriptor_tree *
2797 build_constant_desc (tree exp)
2803 struct constant_descriptor_tree *desc;
2805 desc = ggc_alloc (sizeof (*desc));
2806 desc->value = copy_constant (exp);
2808 /* Propagate marked-ness to copied constant. */
2809 if (flag_mudflap && mf_marked_p (exp))
2810 mf_mark (desc->value);
2812 /* Create a string containing the label name, in LABEL. */
2813 labelno = const_labelno++;
2814 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
2816 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
2817 if (use_object_blocks_p ())
2819 section *sect = get_constant_section (exp);
2820 symbol = create_block_symbol (ggc_strdup (label),
2821 get_block_for_section (sect), -1);
2824 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
2825 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
2826 SET_SYMBOL_REF_DECL (symbol, desc->value);
2827 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
2829 rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), symbol);
2830 set_mem_attributes (rtl, exp, 1);
2831 set_mem_alias_set (rtl, 0);
2832 set_mem_alias_set (rtl, const_alias_set);
2834 /* Set flags or add text to the name to record information, such as
2835 that it is a local symbol. If the name is changed, the macro
2836 ASM_OUTPUT_LABELREF will have to know how to strip this
2837 information. This call might invalidate our local variable
2838 SYMBOL; we can't use it afterward. */
2840 targetm.encode_section_info (exp, rtl, true);
2847 /* Return an rtx representing a reference to constant data in memory
2848 for the constant expression EXP.
2850 If assembler code for such a constant has already been output,
2851 return an rtx to refer to it.
2852 Otherwise, output such a constant in memory
2853 and generate an rtx for it.
2855 If DEFER is nonzero, this constant can be deferred and output only
2856 if referenced in the function after all optimizations.
2858 `const_desc_table' records which constants already have label strings. */
2861 output_constant_def (tree exp, int defer)
2863 struct constant_descriptor_tree *desc;
2864 struct constant_descriptor_tree key;
2867 /* Look up EXP in the table of constant descriptors. If we didn't find
2868 it, create a new one. */
2870 key.hash = const_hash_1 (exp);
2871 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
2876 desc = build_constant_desc (exp);
2877 desc->hash = key.hash;
2881 maybe_output_constant_def_contents (desc, defer);
2885 /* Subroutine of output_constant_def: Decide whether or not we need to
2886 output the constant DESC now, and if so, do it. */
2888 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
2891 rtx symbol = XEXP (desc->rtl, 0);
2892 tree exp = desc->value;
2894 if (flag_syntax_only)
2897 if (TREE_ASM_WRITTEN (exp))
2898 /* Already output; don't do it again. */
2901 /* We can always defer constants as long as the context allows
2905 /* Increment n_deferred_constants if it exists. It needs to be at
2906 least as large as the number of constants actually referred to
2907 by the function. If it's too small we'll stop looking too early
2908 and fail to emit constants; if it's too large we'll only look
2909 through the entire function when we could have stopped earlier. */
2911 n_deferred_constants++;
2915 output_constant_def_contents (symbol);
2918 /* Subroutine of output_constant_def_contents. Output the definition
2919 of constant EXP, which is pointed to by label LABEL. ALIGN is the
2920 constant's alignment in bits. */
2923 assemble_constant_contents (tree exp, const char *label, unsigned int align)
2927 size = get_constant_size (exp);
2929 /* Do any machine/system dependent processing of the constant. */
2930 #ifdef ASM_DECLARE_CONSTANT_NAME
2931 ASM_DECLARE_CONSTANT_NAME (asm_out_file, label, exp, size);
2933 /* Standard thing is just output label for the constant. */
2934 ASM_OUTPUT_LABEL (asm_out_file, label);
2935 #endif /* ASM_DECLARE_CONSTANT_NAME */
2937 /* Output the value of EXP. */
2938 output_constant (exp, size, align);
2941 /* We must output the constant data referred to by SYMBOL; do so. */
2944 output_constant_def_contents (rtx symbol)
2946 tree exp = SYMBOL_REF_DECL (symbol);
2949 /* Make sure any other constants whose addresses appear in EXP
2950 are assigned label numbers. */
2951 output_addressed_constants (exp);
2953 /* We are no longer deferring this constant. */
2954 TREE_ASM_WRITTEN (exp) = 1;
2956 /* If the constant is part of an object block, make sure that the
2957 decl has been positioned within its block, but do not write out
2958 its definition yet. output_object_blocks will do that later. */
2959 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
2960 place_block_symbol (symbol);
2963 switch_to_section (get_constant_section (exp));
2964 align = get_constant_alignment (exp);
2965 if (align > BITS_PER_UNIT)
2966 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
2967 assemble_constant_contents (exp, XSTR (symbol, 0), align);
2970 mudflap_enqueue_constant (exp);
2973 /* Look up EXP in the table of constant descriptors. Return the rtl
2974 if it has been emitted, else null. */
2977 lookup_constant_def (tree exp)
2979 struct constant_descriptor_tree *desc;
2980 struct constant_descriptor_tree key;
2983 key.hash = const_hash_1 (exp);
2984 desc = htab_find_with_hash (const_desc_htab, &key, key.hash);
2986 return (desc ? desc->rtl : NULL_RTX);
2989 /* Used in the hash tables to avoid outputting the same constant
2990 twice. Unlike 'struct constant_descriptor_tree', RTX constants
2991 are output once per function, not once per file. */
2992 /* ??? Only a few targets need per-function constant pools. Most
2993 can use one per-file pool. Should add a targetm bit to tell the
2996 struct rtx_constant_pool GTY(())
2998 /* Pointers to first and last constant in pool, as ordered by offset. */
2999 struct constant_descriptor_rtx *first;
3000 struct constant_descriptor_rtx *last;
3002 /* Hash facility for making memory-constants from constant rtl-expressions.
3003 It is used on RISC machines where immediate integer arguments and
3004 constant addresses are restricted so that such constants must be stored
3006 htab_t GTY((param_is (struct constant_descriptor_rtx))) const_rtx_htab;
3008 /* Current offset in constant pool (does not include any
3009 machine-specific header). */
3010 HOST_WIDE_INT offset;
3013 struct constant_descriptor_rtx GTY((chain_next ("%h.next")))
3015 struct constant_descriptor_rtx *next;
3019 HOST_WIDE_INT offset;
3021 enum machine_mode mode;
3027 /* Hash and compare functions for const_rtx_htab. */
3030 const_desc_rtx_hash (const void *ptr)
3032 const struct constant_descriptor_rtx *desc = ptr;
3037 const_desc_rtx_eq (const void *a, const void *b)
3039 const struct constant_descriptor_rtx *x = a;
3040 const struct constant_descriptor_rtx *y = b;
3042 if (x->mode != y->mode)
3044 return rtx_equal_p (x->constant, y->constant);
3047 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3050 const_rtx_hash_1 (rtx *xp, void *data)
3052 unsigned HOST_WIDE_INT hwi;
3053 enum machine_mode mode;
3059 code = GET_CODE (x);
3060 mode = GET_MODE (x);
3061 h = (hashval_t) code * 1048573 + mode;
3069 const int shift = sizeof (hashval_t) * CHAR_BIT;
3070 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3073 h ^= (hashval_t) hwi;
3074 for (i = 1; i < n; ++i)
3077 h ^= (hashval_t) hwi;
3083 if (mode == VOIDmode)
3085 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3089 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3095 for (i = XVECLEN (x, 0); i-- > 0; )
3096 h = h * 251 + const_rtx_hash_1 (&XVECEXP (x, 0, i), data);
3101 h ^= htab_hash_string (XSTR (x, 0));
3105 h = h * 251 + CODE_LABEL_NUMBER (XEXP (x, 0));
3109 case UNSPEC_VOLATILE:
3110 h = h * 251 + XINT (x, 1);
3118 *hp = *hp * 509 + h;
3122 /* Compute a hash value for X, which should be a constant. */
3125 const_rtx_hash (rtx x)
3128 for_each_rtx (&x, const_rtx_hash_1, &h);
3133 /* Create and return a new rtx constant pool. */
3135 static struct rtx_constant_pool *
3136 create_constant_pool (void)
3138 struct rtx_constant_pool *pool;
3140 pool = ggc_alloc (sizeof (struct rtx_constant_pool));
3141 pool->const_rtx_htab = htab_create_ggc (31, const_desc_rtx_hash,
3142 const_desc_rtx_eq, NULL);
3149 /* Initialize constant pool hashing for a new function. */
3152 init_varasm_status (struct function *f)
3154 struct varasm_status *p;
3156 p = ggc_alloc (sizeof (struct varasm_status));
3159 p->pool = create_constant_pool ();
3160 p->deferred_constants = 0;
3163 /* Given a MINUS expression, simplify it if both sides
3164 include the same symbol. */
3167 simplify_subtraction (rtx x)
3169 rtx r = simplify_rtx (x);
3173 /* Given a constant rtx X, make (or find) a memory constant for its value
3174 and return a MEM rtx to refer to it in memory. */
3177 force_const_mem (enum machine_mode mode, rtx x)
3179 struct constant_descriptor_rtx *desc, tmp;
3180 struct rtx_constant_pool *pool;
3187 /* If we're not allowed to drop X into the constant pool, don't. */
3188 if (targetm.cannot_force_const_mem (x))
3191 /* Record that this function has used a constant pool entry. */
3192 current_function_uses_const_pool = 1;
3194 /* Decide which pool to use. */
3195 pool = (targetm.use_blocks_for_constant_p (mode, x)
3196 ? shared_constant_pool
3197 : cfun->varasm->pool);
3199 /* Lookup the value in the hashtable. */
3202 hash = const_rtx_hash (x);
3203 slot = htab_find_slot_with_hash (pool->const_rtx_htab, &tmp, hash, INSERT);
3206 /* If the constant was already present, return its memory. */
3208 return copy_rtx (desc->mem);
3210 /* Otherwise, create a new descriptor. */
3211 desc = ggc_alloc (sizeof (*desc));
3214 /* Align the location counter as required by EXP's data type. */
3215 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3216 #ifdef CONSTANT_ALIGNMENT
3218 tree type = lang_hooks.types.type_for_mode (mode, 0);
3219 if (type != NULL_TREE)
3220 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3224 pool->offset += (align / BITS_PER_UNIT) - 1;
3225 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3228 desc->constant = tmp.constant;
3229 desc->offset = pool->offset;
3232 desc->align = align;
3233 desc->labelno = const_labelno;
3236 pool->offset += GET_MODE_SIZE (mode);
3238 pool->last->next = desc;
3240 pool->first = pool->last = desc;
3243 /* Create a string containing the label name, in LABEL. */
3244 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3247 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3248 the constants pool. */
3249 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3251 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3252 symbol = create_block_symbol (ggc_strdup (label),
3253 get_block_for_section (sect), -1);
3256 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3258 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3259 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3260 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3262 /* Construct the MEM. */
3263 desc->mem = def = gen_const_mem (mode, symbol);
3264 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3265 set_mem_align (def, align);
3267 /* If we're dropping a label to the constant pool, make sure we
3269 if (GET_CODE (x) == LABEL_REF)
3270 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3272 return copy_rtx (def);
3275 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3278 get_pool_constant (rtx addr)
3280 return SYMBOL_REF_CONSTANT (addr)->constant;
3283 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3284 and whether it has been output or not. */
3287 get_pool_constant_mark (rtx addr, bool *pmarked)
3289 struct constant_descriptor_rtx *desc;
3291 desc = SYMBOL_REF_CONSTANT (addr);
3292 *pmarked = (desc->mark != 0);
3293 return desc->constant;
3296 /* Similar, return the mode. */
3299 get_pool_mode (rtx addr)
3301 return SYMBOL_REF_CONSTANT (addr)->mode;
3304 /* Return the size of the constant pool. */
3307 get_pool_size (void)
3309 return cfun->varasm->pool->offset;
3312 /* Worker function for output_constant_pool_1. Emit assembly for X
3313 in MODE with known alignment ALIGN. */
3316 output_constant_pool_2 (enum machine_mode mode, rtx x, unsigned int align)
3318 switch (GET_MODE_CLASS (mode))
3321 case MODE_DECIMAL_FLOAT:
3325 gcc_assert (GET_CODE (x) == CONST_DOUBLE);
3326 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
3327 assemble_real (r, mode, align);
3332 case MODE_PARTIAL_INT:
3333 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3336 case MODE_VECTOR_FLOAT:
3337 case MODE_VECTOR_INT:
3340 enum machine_mode submode = GET_MODE_INNER (mode);
3341 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3343 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3344 units = CONST_VECTOR_NUNITS (x);
3346 for (i = 0; i < units; i++)
3348 rtx elt = CONST_VECTOR_ELT (x, i);
3349 output_constant_pool_2 (submode, elt, i ? subalign : align);
3359 /* Worker function for output_constant_pool. Emit constant DESC,
3360 giving it ALIGN bits of alignment. */
3363 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3370 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3371 whose CODE_LABEL has been deleted. This can occur if a jump table
3372 is eliminated by optimization. If so, write a constant of zero
3373 instead. Note that this can also happen by turning the
3374 CODE_LABEL into a NOTE. */
3375 /* ??? This seems completely and utterly wrong. Certainly it's
3376 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3377 functioning even with INSN_DELETED_P and friends. */
3380 switch (GET_CODE (x))
3383 if (GET_CODE (XEXP (x, 0)) != PLUS
3384 || GET_CODE (XEXP (XEXP (x, 0), 0)) != LABEL_REF)
3386 tmp = XEXP (XEXP (x, 0), 0);
3391 gcc_assert (!INSN_DELETED_P (tmp));
3392 gcc_assert (!NOTE_P (tmp)
3393 || NOTE_LINE_NUMBER (tmp) != NOTE_INSN_DELETED);
3400 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3401 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3402 align, desc->labelno, done);
3405 assemble_align (align);
3407 /* Output the label. */
3408 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3410 /* Output the data. */
3411 output_constant_pool_2 (desc->mode, x, align);
3413 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3414 sections have proper size. */
3415 if (align > GET_MODE_BITSIZE (desc->mode)
3417 && (in_section->common.flags & SECTION_MERGE))
3418 assemble_align (align);
3420 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3426 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3427 to as used. Emit referenced deferred strings. This function can
3428 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3431 mark_constant (rtx *current_rtx, void *data ATTRIBUTE_UNUSED)
3433 rtx x = *current_rtx;
3435 if (x == NULL_RTX || GET_CODE (x) != SYMBOL_REF)
3438 if (CONSTANT_POOL_ADDRESS_P (x))
3440 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3441 if (desc->mark == 0)
3444 for_each_rtx (&desc->constant, mark_constant, NULL);
3447 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3449 tree exp = SYMBOL_REF_DECL (x);
3450 if (!TREE_ASM_WRITTEN (exp))
3452 n_deferred_constants--;
3453 output_constant_def_contents (x);
3460 /* Look through appropriate parts of INSN, marking all entries in the
3461 constant pool which are actually being used. Entries that are only
3462 referenced by other constants are also marked as used. Emit
3463 deferred strings that are used. */
3466 mark_constants (rtx insn)
3471 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3472 insns, not any notes that may be attached. We don't want to mark
3473 a constant just because it happens to appear in a REG_EQUIV note. */
3474 if (GET_CODE (PATTERN (insn)) == SEQUENCE)
3476 rtx seq = PATTERN (insn);
3477 int i, n = XVECLEN (seq, 0);
3478 for (i = 0; i < n; ++i)
3480 rtx subinsn = XVECEXP (seq, 0, i);
3481 if (INSN_P (subinsn))
3482 for_each_rtx (&PATTERN (subinsn), mark_constant, NULL);
3486 for_each_rtx (&PATTERN (insn), mark_constant, NULL);
3489 /* Look through the instructions for this function, and mark all the
3490 entries in POOL which are actually being used. Emit deferred constants
3491 which have indeed been used. */
3494 mark_constant_pool (void)
3498 if (!current_function_uses_const_pool && n_deferred_constants == 0)
3501 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3502 mark_constants (insn);
3504 for (link = current_function_epilogue_delay_list;
3506 link = XEXP (link, 1))
3507 mark_constants (XEXP (link, 0));
3510 /* Write all the constants in POOL. */
3513 output_constant_pool_contents (struct rtx_constant_pool *pool)
3515 struct constant_descriptor_rtx *desc;
3517 for (desc = pool->first; desc ; desc = desc->next)
3520 /* If the constant is part of an object_block, make sure that
3521 the constant has been positioned within its block, but do not
3522 write out its definition yet. output_object_blocks will do
3524 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc->sym)
3525 && SYMBOL_REF_BLOCK (desc->sym))
3526 place_block_symbol (desc->sym);
3529 switch_to_section (targetm.asm_out.select_rtx_section
3530 (desc->mode, desc->constant, desc->align));
3531 output_constant_pool_1 (desc, desc->align);
3536 /* Mark all constants that are used in the current function, then write
3537 out the function's private constant pool. */
3540 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
3541 tree fndecl ATTRIBUTE_UNUSED)
3543 struct rtx_constant_pool *pool = cfun->varasm->pool;
3545 /* It is possible for gcc to call force_const_mem and then to later
3546 discard the instructions which refer to the constant. In such a
3547 case we do not need to output the constant. */
3548 mark_constant_pool ();
3550 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3551 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
3554 output_constant_pool_contents (pool);
3556 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3557 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
3561 /* Write the contents of the shared constant pool. */
3564 output_shared_constant_pool (void)
3566 output_constant_pool_contents (shared_constant_pool);
3569 /* Determine what kind of relocations EXP may need. */
3572 compute_reloc_for_constant (tree exp)
3574 int reloc = 0, reloc2;
3577 /* Give the front-end a chance to convert VALUE to something that
3578 looks more like a constant to the back-end. */
3579 exp = lang_hooks.expand_constant (exp);
3581 switch (TREE_CODE (exp))
3585 /* Go inside any operations that get_inner_reference can handle and see
3586 if what's inside is a constant: no need to do anything here for
3587 addresses of variables or functions. */
3588 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3589 tem = TREE_OPERAND (tem, 0))
3592 if (TREE_PUBLIC (tem))
3599 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3600 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3604 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3605 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3606 /* The difference of two local labels is computable at link time. */
3607 if (reloc == 1 && reloc2 == 1)
3615 case NON_LVALUE_EXPR:
3616 case VIEW_CONVERT_EXPR:
3617 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3622 unsigned HOST_WIDE_INT idx;
3623 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3625 reloc |= compute_reloc_for_constant (tem);
3635 /* Find all the constants whose addresses are referenced inside of EXP,
3636 and make sure assembler code with a label has been output for each one.
3637 Indicate whether an ADDR_EXPR has been encountered. */
3640 output_addressed_constants (tree exp)
3644 /* Give the front-end a chance to convert VALUE to something that
3645 looks more like a constant to the back-end. */
3646 exp = lang_hooks.expand_constant (exp);
3648 switch (TREE_CODE (exp))
3652 /* Go inside any operations that get_inner_reference can handle and see
3653 if what's inside is a constant: no need to do anything here for
3654 addresses of variables or functions. */
3655 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3656 tem = TREE_OPERAND (tem, 0))
3659 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3660 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
3661 tem = DECL_INITIAL (tem);
3663 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
3664 output_constant_def (tem, 0);
3669 output_addressed_constants (TREE_OPERAND (exp, 1));
3674 case NON_LVALUE_EXPR:
3675 case VIEW_CONVERT_EXPR:
3676 output_addressed_constants (TREE_OPERAND (exp, 0));
3681 unsigned HOST_WIDE_INT idx;
3682 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3684 output_addressed_constants (tem);
3693 /* Whether a constructor CTOR is a valid static constant initializer if all
3694 its elements are. This used to be internal to initializer_constant_valid_p
3695 and has been exposed to let other functions like categorize_ctor_elements
3696 evaluate the property while walking a constructor for other purposes. */
3699 constructor_static_from_elts_p (tree ctor)
3701 return (TREE_CONSTANT (ctor)
3702 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
3703 || TREE_CODE (TREE_TYPE (ctor)) == RECORD_TYPE)
3704 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (ctor)));
3707 /* Return nonzero if VALUE is a valid constant-valued expression
3708 for use in initializing a static variable; one that can be an
3709 element of a "constant" initializer.
3711 Return null_pointer_node if the value is absolute;
3712 if it is relocatable, return the variable that determines the relocation.
3713 We assume that VALUE has been folded as much as possible;
3714 therefore, we do not need to check for such things as
3715 arithmetic-combinations of integers. */
3718 initializer_constant_valid_p (tree value, tree endtype)
3720 /* Give the front-end a chance to convert VALUE to something that
3721 looks more like a constant to the back-end. */
3722 value = lang_hooks.expand_constant (value);
3724 switch (TREE_CODE (value))
3727 if (constructor_static_from_elts_p (value))
3729 unsigned HOST_WIDE_INT idx;
3731 bool absolute = true;
3733 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
3736 reloc = initializer_constant_valid_p (elt, TREE_TYPE (elt));
3739 if (reloc != null_pointer_node)
3742 /* For a non-absolute relocation, there is no single
3743 variable that can be "the variable that determines the
3745 return absolute ? null_pointer_node : error_mark_node;
3748 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
3755 return null_pointer_node;
3759 value = staticp (TREE_OPERAND (value, 0));
3762 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out to
3763 be a constant, this is old-skool offsetof-like nonsense. */
3764 if (TREE_CODE (value) == INDIRECT_REF
3765 && TREE_CONSTANT (TREE_OPERAND (value, 0)))
3766 return null_pointer_node;
3767 /* Taking the address of a nested function involves a trampoline. */
3768 if (TREE_CODE (value) == FUNCTION_DECL
3769 && ((decl_function_context (value)
3770 && !DECL_NO_STATIC_CHAIN (value))
3771 || DECL_DLLIMPORT_P (value)))
3773 /* "&{...}" requires a temporary to hold the constructed
3775 if (TREE_CODE (value) == CONSTRUCTOR)
3780 case VIEW_CONVERT_EXPR:
3781 case NON_LVALUE_EXPR:
3782 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
3791 src = TREE_OPERAND (value, 0);
3792 src_type = TREE_TYPE (src);
3793 dest_type = TREE_TYPE (value);
3795 /* Allow conversions between pointer types, floating-point
3796 types, and offset types. */
3797 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
3798 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
3799 || (TREE_CODE (dest_type) == OFFSET_TYPE
3800 && TREE_CODE (src_type) == OFFSET_TYPE))
3801 return initializer_constant_valid_p (src, endtype);
3803 /* Allow length-preserving conversions between integer types. */
3804 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
3805 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
3806 return initializer_constant_valid_p (src, endtype);
3808 /* Allow conversions between other integer types only if
3810 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
3812 tree inner = initializer_constant_valid_p (src, endtype);
3813 if (inner == null_pointer_node)
3814 return null_pointer_node;
3818 /* Allow (int) &foo provided int is as wide as a pointer. */
3819 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
3820 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
3821 return initializer_constant_valid_p (src, endtype);
3823 /* Likewise conversions from int to pointers, but also allow
3824 conversions from 0. */
3825 if ((POINTER_TYPE_P (dest_type)
3826 || TREE_CODE (dest_type) == OFFSET_TYPE)
3827 && INTEGRAL_TYPE_P (src_type))
3829 if (TREE_CODE (src) == INTEGER_CST
3830 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
3831 return null_pointer_node;
3832 if (integer_zerop (src))
3833 return null_pointer_node;
3834 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
3835 return initializer_constant_valid_p (src, endtype);
3838 /* Allow conversions to struct or union types if the value
3840 if (TREE_CODE (dest_type) == RECORD_TYPE
3841 || TREE_CODE (dest_type) == UNION_TYPE)
3842 return initializer_constant_valid_p (src, endtype);
3847 if (! INTEGRAL_TYPE_P (endtype)
3848 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
3850 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
3852 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
3854 /* If either term is absolute, use the other terms relocation. */
3855 if (valid0 == null_pointer_node)
3857 if (valid1 == null_pointer_node)
3863 if (! INTEGRAL_TYPE_P (endtype)
3864 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
3866 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
3868 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
3870 /* Win if second argument is absolute. */
3871 if (valid1 == null_pointer_node)
3873 /* Win if both arguments have the same relocation.
3874 Then the value is absolute. */
3875 if (valid0 == valid1 && valid0 != 0)
3876 return null_pointer_node;
3878 /* Since GCC guarantees that string constants are unique in the
3879 generated code, a subtraction between two copies of the same
3880 constant string is absolute. */
3881 if (valid0 && TREE_CODE (valid0) == STRING_CST
3882 && valid1 && TREE_CODE (valid1) == STRING_CST
3883 && operand_equal_p (valid0, valid1, 1))
3884 return null_pointer_node;
3887 /* Support narrowing differences. */
3888 if (INTEGRAL_TYPE_P (endtype))
3892 op0 = TREE_OPERAND (value, 0);
3893 op1 = TREE_OPERAND (value, 1);
3895 /* Like STRIP_NOPS except allow the operand mode to widen.
3896 This works around a feature of fold that simplifies
3897 (int)(p1 - p2) to ((int)p1 - (int)p2) under the theory
3898 that the narrower operation is cheaper. */
3900 while (TREE_CODE (op0) == NOP_EXPR
3901 || TREE_CODE (op0) == CONVERT_EXPR
3902 || TREE_CODE (op0) == NON_LVALUE_EXPR)
3904 tree inner = TREE_OPERAND (op0, 0);
3905 if (inner == error_mark_node
3906 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
3907 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
3908 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
3913 while (TREE_CODE (op1) == NOP_EXPR
3914 || TREE_CODE (op1) == CONVERT_EXPR
3915 || TREE_CODE (op1) == NON_LVALUE_EXPR)
3917 tree inner = TREE_OPERAND (op1, 0);
3918 if (inner == error_mark_node
3919 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
3920 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
3921 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
3926 op0 = initializer_constant_valid_p (op0, endtype);
3927 op1 = initializer_constant_valid_p (op1, endtype);
3929 /* Both initializers must be known. */
3933 return null_pointer_node;
3935 /* Support differences between labels. */
3936 if (TREE_CODE (op0) == LABEL_DECL
3937 && TREE_CODE (op1) == LABEL_DECL)
3938 return null_pointer_node;
3940 if (TREE_CODE (op0) == STRING_CST
3941 && TREE_CODE (op1) == STRING_CST
3942 && operand_equal_p (op0, op1, 1))
3943 return null_pointer_node;
3955 /* Output assembler code for constant EXP to FILE, with no label.
3956 This includes the pseudo-op such as ".int" or ".byte", and a newline.
3957 Assumes output_addressed_constants has been done on EXP already.
3959 Generate exactly SIZE bytes of assembler data, padding at the end
3960 with zeros if necessary. SIZE must always be specified.
3962 SIZE is important for structure constructors,
3963 since trailing members may have been omitted from the constructor.
3964 It is also important for initialization of arrays from string constants
3965 since the full length of the string constant might not be wanted.
3966 It is also needed for initialization of unions, where the initializer's
3967 type is just one member, and that may not be as long as the union.
3969 There a case in which we would fail to output exactly SIZE bytes:
3970 for a structure constructor that wants to produce more than SIZE bytes.
3971 But such constructors will never be generated for any possible input.
3973 ALIGN is the alignment of the data in bits. */
3976 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
3978 enum tree_code code;
3979 unsigned HOST_WIDE_INT thissize;
3981 /* Some front-ends use constants other than the standard language-independent
3982 varieties, but which may still be output directly. Give the front-end a
3983 chance to convert EXP to a language-independent representation. */
3984 exp = lang_hooks.expand_constant (exp);
3986 if (size == 0 || flag_syntax_only)
3989 /* See if we're trying to initialize a pointer in a non-default mode
3990 to the address of some declaration somewhere. If the target says
3991 the mode is valid for pointers, assume the target has a way of
3993 if (TREE_CODE (exp) == NOP_EXPR
3994 && POINTER_TYPE_P (TREE_TYPE (exp))
3995 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
3997 tree saved_type = TREE_TYPE (exp);
3999 /* Peel off any intermediate conversions-to-pointer for valid
4001 while (TREE_CODE (exp) == NOP_EXPR
4002 && POINTER_TYPE_P (TREE_TYPE (exp))
4003 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
4004 exp = TREE_OPERAND (exp, 0);
4006 /* If what we're left with is the address of something, we can
4007 convert the address to the final type and output it that
4009 if (TREE_CODE (exp) == ADDR_EXPR)
4010 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
4011 /* Likewise for constant ints. */
4012 else if (TREE_CODE (exp) == INTEGER_CST)
4013 exp = build_int_cst_wide (saved_type, TREE_INT_CST_LOW (exp),
4014 TREE_INT_CST_HIGH (exp));
4018 /* Eliminate any conversions since we'll be outputting the underlying
4020 while (TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
4021 || TREE_CODE (exp) == NON_LVALUE_EXPR
4022 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
4024 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
4025 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
4027 /* Make sure eliminating the conversion is really a no-op, except with
4028 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4029 union types to allow for Ada unchecked unions. */
4030 if (type_size > op_size
4031 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
4032 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
4033 /* Keep the conversion. */
4036 exp = TREE_OPERAND (exp, 0);
4039 code = TREE_CODE (TREE_TYPE (exp));
4040 thissize = int_size_in_bytes (TREE_TYPE (exp));
4042 /* Give the front end another chance to expand constants. */
4043 exp = lang_hooks.expand_constant (exp);
4045 /* Allow a constructor with no elements for any data type.
4046 This means to fill the space with zeros. */
4047 if (TREE_CODE (exp) == CONSTRUCTOR
4048 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (exp)))
4050 assemble_zeros (size);
4054 if (TREE_CODE (exp) == FDESC_EXPR)
4056 #ifdef ASM_OUTPUT_FDESC
4057 HOST_WIDE_INT part = tree_low_cst (TREE_OPERAND (exp, 1), 0);
4058 tree decl = TREE_OPERAND (exp, 0);
4059 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4066 /* Now output the underlying data. If we've handling the padding, return.
4067 Otherwise, break and ensure SIZE is the size written. */
4074 case REFERENCE_TYPE:
4076 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
4077 EXPAND_INITIALIZER),
4078 MIN (size, thissize), align, 0))
4079 error ("initializer for integer value is too complicated");
4083 if (TREE_CODE (exp) != REAL_CST)
4084 error ("initializer for floating value is not a floating constant");
4086 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)), align);
4090 output_constant (TREE_REALPART (exp), thissize / 2, align);
4091 output_constant (TREE_IMAGPART (exp), thissize / 2,
4092 min_align (align, BITS_PER_UNIT * (thissize / 2)));
4097 switch (TREE_CODE (exp))
4100 output_constructor (exp, size, align);
4103 thissize = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp),
4105 assemble_string (TREE_STRING_POINTER (exp), thissize);
4112 unsigned int nalign;
4113 enum machine_mode inner;
4115 inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4116 nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4118 elt_size = GET_MODE_SIZE (inner);
4120 link = TREE_VECTOR_CST_ELTS (exp);
4121 output_constant (TREE_VALUE (link), elt_size, align);
4122 thissize = elt_size;
4123 while ((link = TREE_CHAIN (link)) != NULL)
4125 output_constant (TREE_VALUE (link), elt_size, nalign);
4126 thissize += elt_size;
4137 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4138 output_constructor (exp, size, align);
4148 if (size > thissize)
4149 assemble_zeros (size - thissize);
4153 /* Subroutine of output_constructor, used for computing the size of
4154 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4155 type with an unspecified upper bound. */
4157 static unsigned HOST_WIDE_INT
4158 array_size_for_constructor (tree val)
4161 unsigned HOST_WIDE_INT cnt;
4162 tree index, value, tmp;
4164 /* This code used to attempt to handle string constants that are not
4165 arrays of single-bytes, but nothing else does, so there's no point in
4167 if (TREE_CODE (val) == STRING_CST)
4168 return TREE_STRING_LENGTH (val);
4170 max_index = NULL_TREE;
4171 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4173 if (TREE_CODE (index) == RANGE_EXPR)
4174 index = TREE_OPERAND (index, 1);
4175 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4179 if (max_index == NULL_TREE)
4182 /* Compute the total number of array elements. */
4183 tmp = TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)));
4184 i = size_binop (MINUS_EXPR, fold_convert (sizetype, max_index),
4185 fold_convert (sizetype, tmp));
4186 i = size_binop (PLUS_EXPR, i, build_int_cst (sizetype, 1));
4188 /* Multiply by the array element unit size to find number of bytes. */
4189 i = size_binop (MULT_EXPR, i, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4191 return tree_low_cst (i, 1);
4194 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4195 Generate at least SIZE bytes, padding if necessary. */
4198 output_constructor (tree exp, unsigned HOST_WIDE_INT size,
4201 tree type = TREE_TYPE (exp);
4204 /* Number of bytes output or skipped so far.
4205 In other words, current position within the constructor. */
4206 HOST_WIDE_INT total_bytes = 0;
4207 /* Nonzero means BYTE contains part of a byte, to be output. */
4208 int byte_buffer_in_use = 0;
4210 unsigned HOST_WIDE_INT cnt;
4211 constructor_elt *ce;
4213 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
4215 if (TREE_CODE (type) == RECORD_TYPE)
4216 field = TYPE_FIELDS (type);
4218 if (TREE_CODE (type) == ARRAY_TYPE
4219 && TYPE_DOMAIN (type) != 0)
4220 min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (type));
4222 /* As LINK goes through the elements of the constant,
4223 FIELD goes through the structure fields, if the constant is a structure.
4224 if the constant is a union, then we override this,
4225 by getting the field from the TREE_LIST element.
4226 But the constant could also be an array. Then FIELD is zero.
4228 There is always a maximum of one element in the chain LINK for unions
4229 (even if the initializer in a source program incorrectly contains
4232 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), cnt, ce);
4233 cnt++, field = field ? TREE_CHAIN (field) : 0)
4235 tree val = ce->value;
4238 /* The element in a union constructor specifies the proper field
4240 if ((TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
4241 || TREE_CODE (type) == QUAL_UNION_TYPE)
4245 else if (TREE_CODE (type) == ARRAY_TYPE)
4248 #ifdef ASM_COMMENT_START
4249 if (field && flag_verbose_asm)
4250 fprintf (asm_out_file, "%s %s:\n",
4253 ? IDENTIFIER_POINTER (DECL_NAME (field))
4257 /* Eliminate the marker that makes a cast not be an lvalue. */
4261 if (index && TREE_CODE (index) == RANGE_EXPR)
4263 unsigned HOST_WIDE_INT fieldsize
4264 = int_size_in_bytes (TREE_TYPE (type));
4265 HOST_WIDE_INT lo_index = tree_low_cst (TREE_OPERAND (index, 0), 0);
4266 HOST_WIDE_INT hi_index = tree_low_cst (TREE_OPERAND (index, 1), 0);
4267 HOST_WIDE_INT index;
4268 unsigned int align2 = min_align (align, fieldsize * BITS_PER_UNIT);
4270 for (index = lo_index; index <= hi_index; index++)
4272 /* Output the element's initial value. */
4274 assemble_zeros (fieldsize);
4276 output_constant (val, fieldsize, align2);
4278 /* Count its size. */
4279 total_bytes += fieldsize;
4282 else if (field == 0 || !DECL_BIT_FIELD (field))
4284 /* An element that is not a bit-field. */
4286 unsigned HOST_WIDE_INT fieldsize;
4287 /* Since this structure is static,
4288 we know the positions are constant. */
4289 HOST_WIDE_INT pos = field ? int_byte_position (field) : 0;
4290 unsigned int align2;
4293 pos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val)), 1)
4294 * (tree_low_cst (index, 0) - tree_low_cst (min_index, 0)));
4296 /* Output any buffered-up bit-fields preceding this element. */
4297 if (byte_buffer_in_use)
4299 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4301 byte_buffer_in_use = 0;
4304 /* Advance to offset of this element.
4305 Note no alignment needed in an array, since that is guaranteed
4306 if each element has the proper size. */
4307 if ((field != 0 || index != 0) && pos != total_bytes)
4309 gcc_assert (pos >= total_bytes);
4310 assemble_zeros (pos - total_bytes);
4314 /* Find the alignment of this element. */
4315 align2 = min_align (align, BITS_PER_UNIT * pos);
4317 /* Determine size this element should occupy. */
4322 /* If this is an array with an unspecified upper bound,
4323 the initializer determines the size. */
4324 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4325 but we cannot do this until the deprecated support for
4326 initializing zero-length array members is removed. */
4327 if (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE
4328 && TYPE_DOMAIN (TREE_TYPE (field))
4329 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field))))
4331 fieldsize = array_size_for_constructor (val);
4332 /* Given a non-empty initialization, this field had
4334 gcc_assert (!fieldsize || !TREE_CHAIN (field));
4336 else if (DECL_SIZE_UNIT (field))
4338 /* ??? This can't be right. If the decl size overflows
4339 a host integer we will silently emit no data. */
4340 if (host_integerp (DECL_SIZE_UNIT (field), 1))
4341 fieldsize = tree_low_cst (DECL_SIZE_UNIT (field), 1);
4345 fieldsize = int_size_in_bytes (TREE_TYPE (type));
4347 /* Output the element's initial value. */
4349 assemble_zeros (fieldsize);
4351 output_constant (val, fieldsize, align2);
4353 /* Count its size. */
4354 total_bytes += fieldsize;
4356 else if (val != 0 && TREE_CODE (val) != INTEGER_CST)
4357 error ("invalid initial value for member %qs",
4358 IDENTIFIER_POINTER (DECL_NAME (field)));
4361 /* Element that is a bit-field. */
4363 HOST_WIDE_INT next_offset = int_bit_position (field);
4364 HOST_WIDE_INT end_offset
4365 = (next_offset + tree_low_cst (DECL_SIZE (field), 1));
4368 val = integer_zero_node;
4370 /* If this field does not start in this (or, next) byte,
4372 if (next_offset / BITS_PER_UNIT != total_bytes)
4374 /* Output remnant of any bit field in previous bytes. */
4375 if (byte_buffer_in_use)
4377 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4379 byte_buffer_in_use = 0;
4382 /* If still not at proper byte, advance to there. */
4383 if (next_offset / BITS_PER_UNIT != total_bytes)
4385 gcc_assert (next_offset / BITS_PER_UNIT >= total_bytes);
4386 assemble_zeros (next_offset / BITS_PER_UNIT - total_bytes);
4387 total_bytes = next_offset / BITS_PER_UNIT;
4391 if (! byte_buffer_in_use)
4394 /* We must split the element into pieces that fall within
4395 separate bytes, and combine each byte with previous or
4396 following bit-fields. */
4398 /* next_offset is the offset n fbits from the beginning of
4399 the structure to the next bit of this element to be processed.
4400 end_offset is the offset of the first bit past the end of
4402 while (next_offset < end_offset)
4406 HOST_WIDE_INT value;
4407 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
4408 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
4410 /* Advance from byte to byte
4411 within this element when necessary. */
4412 while (next_byte != total_bytes)
4414 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4419 /* Number of bits we can process at once
4420 (all part of the same byte). */
4421 this_time = MIN (end_offset - next_offset,
4422 BITS_PER_UNIT - next_bit);
4423 if (BYTES_BIG_ENDIAN)
4425 /* On big-endian machine, take the most significant bits
4426 first (of the bits that are significant)
4427 and put them into bytes from the most significant end. */
4428 shift = end_offset - next_offset - this_time;
4430 /* Don't try to take a bunch of bits that cross
4431 the word boundary in the INTEGER_CST. We can
4432 only select bits from the LOW or HIGH part
4434 if (shift < HOST_BITS_PER_WIDE_INT
4435 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4437 this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
4438 shift = HOST_BITS_PER_WIDE_INT;
4441 /* Now get the bits from the appropriate constant word. */
4442 if (shift < HOST_BITS_PER_WIDE_INT)
4443 value = TREE_INT_CST_LOW (val);
4446 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4447 value = TREE_INT_CST_HIGH (val);
4448 shift -= HOST_BITS_PER_WIDE_INT;
4451 /* Get the result. This works only when:
4452 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4453 byte |= (((value >> shift)
4454 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4455 << (BITS_PER_UNIT - this_time - next_bit));
4459 /* On little-endian machines,
4460 take first the least significant bits of the value
4461 and pack them starting at the least significant
4462 bits of the bytes. */
4463 shift = next_offset - int_bit_position (field);
4465 /* Don't try to take a bunch of bits that cross
4466 the word boundary in the INTEGER_CST. We can
4467 only select bits from the LOW or HIGH part
4469 if (shift < HOST_BITS_PER_WIDE_INT
4470 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4471 this_time = (HOST_BITS_PER_WIDE_INT - shift);
4473 /* Now get the bits from the appropriate constant word. */
4474 if (shift < HOST_BITS_PER_WIDE_INT)
4475 value = TREE_INT_CST_LOW (val);
4478 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4479 value = TREE_INT_CST_HIGH (val);
4480 shift -= HOST_BITS_PER_WIDE_INT;
4483 /* Get the result. This works only when:
4484 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4485 byte |= (((value >> shift)
4486 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4490 next_offset += this_time;
4491 byte_buffer_in_use = 1;
4496 if (byte_buffer_in_use)
4498 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4502 if ((unsigned HOST_WIDE_INT)total_bytes < size)
4503 assemble_zeros (size - total_bytes);
4506 /* This TREE_LIST contains any weak symbol declarations waiting
4508 static GTY(()) tree weak_decls;
4510 /* Mark DECL as weak. */
4513 mark_weak (tree decl)
4515 DECL_WEAK (decl) = 1;
4517 if (DECL_RTL_SET_P (decl)
4518 && MEM_P (DECL_RTL (decl))
4519 && XEXP (DECL_RTL (decl), 0)
4520 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
4521 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
4524 /* Merge weak status between NEWDECL and OLDDECL. */
4527 merge_weak (tree newdecl, tree olddecl)
4529 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
4531 if (DECL_WEAK (newdecl) && SUPPORTS_WEAK)
4534 /* We put the NEWDECL on the weak_decls list at some point
4535 and OLDDECL as well. Keep just OLDDECL on the list. */
4536 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
4537 if (TREE_VALUE (*pwd) == newdecl)
4539 *pwd = TREE_CHAIN (*pwd);
4546 if (DECL_WEAK (newdecl))
4550 /* NEWDECL is weak, but OLDDECL is not. */
4552 /* If we already output the OLDDECL, we're in trouble; we can't
4553 go back and make it weak. This error cannot caught in
4554 declare_weak because the NEWDECL and OLDDECL was not yet
4555 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4556 if (TREE_ASM_WRITTEN (olddecl))
4557 error ("weak declaration of %q+D must precede definition",
4560 /* If we've already generated rtl referencing OLDDECL, we may
4561 have done so in a way that will not function properly with
4563 else if (TREE_USED (olddecl)
4564 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)))
4565 warning (0, "weak declaration of %q+D after first use results "
4566 "in unspecified behavior", newdecl);
4570 /* We put the NEWDECL on the weak_decls list at some point.
4571 Replace it with the OLDDECL. */
4572 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
4573 if (TREE_VALUE (wd) == newdecl)
4575 TREE_VALUE (wd) = olddecl;
4578 /* We may not find the entry on the list. If NEWDECL is a
4579 weak alias, then we will have already called
4580 globalize_decl to remove the entry; in that case, we do
4581 not need to do anything. */
4584 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4585 mark_weak (olddecl);
4588 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4589 weak. Just update NEWDECL to indicate that it's weak too. */
4590 mark_weak (newdecl);
4593 /* Declare DECL to be a weak symbol. */
4596 declare_weak (tree decl)
4598 if (! TREE_PUBLIC (decl))
4599 error ("weak declaration of %q+D must be public", decl);
4600 else if (TREE_CODE (decl) == FUNCTION_DECL && TREE_ASM_WRITTEN (decl))
4601 error ("weak declaration of %q+D must precede definition", decl);
4602 else if (SUPPORTS_WEAK)
4604 if (! DECL_WEAK (decl))
4605 weak_decls = tree_cons (NULL, decl, weak_decls);
4608 warning (0, "weak declaration of %q+D not supported", decl);
4614 weak_finish_1 (tree decl)
4616 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
4617 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4620 if (! TREE_USED (decl))
4623 #ifdef ASM_WEAKEN_DECL
4624 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
4626 #ifdef ASM_WEAKEN_LABEL
4627 ASM_WEAKEN_LABEL (asm_out_file, name);
4629 #ifdef ASM_OUTPUT_WEAK_ALIAS
4631 static bool warn_once = 0;
4634 warning (0, "only weak aliases are supported in this configuration");
4644 /* This TREE_LIST contains weakref targets. */
4646 static GTY(()) tree weakref_targets;
4648 /* Forward declaration. */
4649 static tree find_decl_and_mark_needed (tree decl, tree target);
4651 /* Emit any pending weak declarations. */
4658 for (t = weakref_targets; t; t = TREE_CHAIN (t))
4660 tree alias_decl = TREE_PURPOSE (t);
4661 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
4663 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
4664 /* Remove alias_decl from the weak list, but leave entries for
4665 the target alone. */
4667 #ifndef ASM_OUTPUT_WEAKREF
4668 else if (! TREE_SYMBOL_REFERENCED (target))
4670 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
4671 defined, otherwise we and weak_finish_1 would use a
4672 different macros. */
4673 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
4674 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
4676 tree decl = find_decl_and_mark_needed (alias_decl, target);
4680 decl = build_decl (TREE_CODE (alias_decl), target,
4681 TREE_TYPE (alias_decl));
4683 DECL_EXTERNAL (decl) = 1;
4684 TREE_PUBLIC (decl) = 1;
4685 DECL_ARTIFICIAL (decl) = 1;
4686 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
4687 TREE_USED (decl) = 1;
4690 weak_finish_1 (decl);
4699 /* Remove the alias and the target from the pending weak list
4700 so that we do not emit any .weak directives for the former,
4701 nor multiple .weak directives for the latter. */
4702 for (p = &weak_decls; (t2 = *p) ; )
4704 if (TREE_VALUE (t2) == alias_decl
4705 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
4706 *p = TREE_CHAIN (t2);
4708 p = &TREE_CHAIN (t2);
4711 /* Remove other weakrefs to the same target, to speed things up. */
4712 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
4714 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
4715 *p = TREE_CHAIN (t2);
4717 p = &TREE_CHAIN (t2);
4722 for (t = weak_decls; t; t = TREE_CHAIN (t))
4724 tree decl = TREE_VALUE (t);
4726 weak_finish_1 (decl);
4730 /* Emit the assembly bits to indicate that DECL is globally visible. */
4733 globalize_decl (tree decl)
4735 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
4737 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
4738 if (DECL_WEAK (decl))
4742 #ifdef ASM_WEAKEN_DECL
4743 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
4745 ASM_WEAKEN_LABEL (asm_out_file, name);
4748 /* Remove this function from the pending weak list so that
4749 we do not emit multiple .weak directives for it. */
4750 for (p = &weak_decls; (t = *p) ; )
4752 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
4753 *p = TREE_CHAIN (t);
4755 p = &TREE_CHAIN (t);
4758 /* Remove weakrefs to the same target from the pending weakref
4759 list, for the same reason. */
4760 for (p = &weakref_targets; (t = *p) ; )
4762 if (DECL_ASSEMBLER_NAME (decl)
4763 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
4764 *p = TREE_CHAIN (t);
4766 p = &TREE_CHAIN (t);
4771 #elif defined(ASM_MAKE_LABEL_LINKONCE)
4772 if (DECL_ONE_ONLY (decl))
4773 ASM_MAKE_LABEL_LINKONCE (asm_out_file, name);
4776 targetm.asm_out.globalize_label (asm_out_file, name);
4779 /* We have to be able to tell cgraph about the needed-ness of the target
4780 of an alias. This requires that the decl have been defined. Aliases
4781 that precede their definition have to be queued for later processing. */
4783 typedef struct alias_pair GTY(())
4789 /* Define gc'd vector type. */
4790 DEF_VEC_O(alias_pair);
4791 DEF_VEC_ALLOC_O(alias_pair,gc);
4793 static GTY(()) VEC(alias_pair,gc) *alias_pairs;
4795 /* Given an assembly name, find the decl it is associated with. At the
4796 same time, mark it needed for cgraph. */
4799 find_decl_and_mark_needed (tree decl, tree target)
4801 struct cgraph_node *fnode = NULL;
4802 struct cgraph_varpool_node *vnode = NULL;
4804 if (TREE_CODE (decl) == FUNCTION_DECL)
4806 fnode = cgraph_node_for_asm (target);
4808 vnode = cgraph_varpool_node_for_asm (target);
4812 vnode = cgraph_varpool_node_for_asm (target);
4814 fnode = cgraph_node_for_asm (target);
4819 /* We can't mark function nodes as used after cgraph global info
4820 is finished. This wouldn't generally be necessary, but C++
4821 virtual table thunks are introduced late in the game and
4822 might seem like they need marking, although in fact they
4824 if (! cgraph_global_info_ready)
4825 cgraph_mark_needed_node (fnode);
4830 cgraph_varpool_mark_needed_node (vnode);
4837 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
4838 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
4839 tree node is DECL to have the value of the tree node TARGET. */
4842 do_assemble_alias (tree decl, tree target)
4844 if (TREE_ASM_WRITTEN (decl))
4847 TREE_ASM_WRITTEN (decl) = 1;
4848 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
4850 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
4852 ultimate_transparent_alias_target (&target);
4854 if (!TREE_SYMBOL_REFERENCED (target))
4855 weakref_targets = tree_cons (decl, target, weakref_targets);
4857 #ifdef ASM_OUTPUT_WEAKREF
4858 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
4859 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
4860 IDENTIFIER_POINTER (target));
4864 error ("%Jweakref is not supported in this configuration", decl);
4871 #ifdef ASM_OUTPUT_DEF
4872 /* Make name accessible from other files, if appropriate. */
4874 if (TREE_PUBLIC (decl))
4876 globalize_decl (decl);
4877 maybe_assemble_visibility (decl);
4880 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
4881 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
4883 ASM_OUTPUT_DEF (asm_out_file,
4884 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
4885 IDENTIFIER_POINTER (target));
4887 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
4892 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4893 # ifdef ASM_WEAKEN_DECL
4894 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
4896 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
4898 /* Remove this function from the pending weak list so that
4899 we do not emit multiple .weak directives for it. */
4900 for (p = &weak_decls; (t = *p) ; )
4901 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
4902 *p = TREE_CHAIN (t);
4904 p = &TREE_CHAIN (t);
4906 /* Remove weakrefs to the same target from the pending weakref
4907 list, for the same reason. */
4908 for (p = &weakref_targets; (t = *p) ; )
4910 if (DECL_ASSEMBLER_NAME (decl)
4911 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
4912 *p = TREE_CHAIN (t);
4914 p = &TREE_CHAIN (t);
4920 /* First pass of completing pending aliases. Make sure that cgraph knows
4921 which symbols will be required. */
4924 finish_aliases_1 (void)
4929 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
4933 target_decl = find_decl_and_mark_needed (p->decl, p->target);
4934 if (target_decl == NULL)
4936 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
4937 error ("%q+D aliased to undefined symbol %qs",
4938 p->decl, IDENTIFIER_POINTER (p->target));
4940 else if (DECL_EXTERNAL (target_decl)
4941 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
4942 error ("%q+D aliased to external symbol %qs",
4943 p->decl, IDENTIFIER_POINTER (p->target));
4947 /* Second pass of completing pending aliases. Emit the actual assembly.
4948 This happens at the end of compilation and thus it is assured that the
4949 target symbol has been emitted. */
4952 finish_aliases_2 (void)
4957 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
4958 do_assemble_alias (p->decl, p->target);
4960 VEC_truncate (alias_pair, alias_pairs, 0);
4963 /* Emit an assembler directive to make the symbol for DECL an alias to
4964 the symbol for TARGET. */
4967 assemble_alias (tree decl, tree target)
4970 bool is_weakref = false;
4972 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
4974 tree alias = DECL_ASSEMBLER_NAME (decl);
4978 ultimate_transparent_alias_target (&target);
4980 if (alias == target)
4981 error ("weakref %q+D ultimately targets itself", decl);
4984 #ifndef ASM_OUTPUT_WEAKREF
4985 IDENTIFIER_TRANSPARENT_ALIAS (alias) = 1;
4986 TREE_CHAIN (alias) = target;
4989 if (TREE_PUBLIC (decl))
4990 error ("weakref %q+D must have static linkage", decl);
4994 #if !defined (ASM_OUTPUT_DEF)
4995 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
4996 error ("%Jalias definitions not supported in this configuration", decl);
4999 if (!DECL_WEAK (decl))
5001 error ("%Jonly weak aliases are supported in this configuration", decl);
5008 /* We must force creation of DECL_RTL for debug info generation, even though
5009 we don't use it here. */
5010 make_decl_rtl (decl);
5011 TREE_USED (decl) = 1;
5013 /* A quirk of the initial implementation of aliases required that the user
5014 add "extern" to all of them. Which is silly, but now historical. Do
5015 note that the symbol is in fact locally defined. */
5017 DECL_EXTERNAL (decl) = 0;
5019 /* Allow aliases to aliases. */
5020 if (TREE_CODE (decl) == FUNCTION_DECL)
5021 cgraph_node (decl)->alias = true;
5023 cgraph_varpool_node (decl)->alias = true;
5025 /* If the target has already been emitted, we don't have to queue the
5026 alias. This saves a tad o memory. */
5027 target_decl = find_decl_and_mark_needed (decl, target);
5028 if (target_decl && TREE_ASM_WRITTEN (target_decl))
5029 do_assemble_alias (decl, target);
5032 alias_pair *p = VEC_safe_push (alias_pair, gc, alias_pairs, NULL);
5038 /* Emit an assembler directive to set symbol for DECL visibility to
5039 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5042 default_assemble_visibility (tree decl, int vis)
5044 static const char * const visibility_types[] = {
5045 NULL, "protected", "hidden", "internal"
5048 const char *name, *type;
5050 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5051 type = visibility_types[vis];
5053 #ifdef HAVE_GAS_HIDDEN
5054 fprintf (asm_out_file, "\t.%s\t", type);
5055 assemble_name (asm_out_file, name);
5056 fprintf (asm_out_file, "\n");
5058 warning (OPT_Wattributes, "visibility attribute not supported "
5059 "in this configuration; ignored");
5063 /* A helper function to call assemble_visibility when needed for a decl. */
5066 maybe_assemble_visibility (tree decl)
5068 enum symbol_visibility vis = DECL_VISIBILITY (decl);
5070 if (vis != VISIBILITY_DEFAULT)
5072 targetm.asm_out.visibility (decl, vis);
5079 /* Returns 1 if the target configuration supports defining public symbols
5080 so that one of them will be chosen at link time instead of generating a
5081 multiply-defined symbol error, whether through the use of weak symbols or
5082 a target-specific mechanism for having duplicates discarded. */
5085 supports_one_only (void)
5087 if (SUPPORTS_ONE_ONLY)
5089 return SUPPORTS_WEAK;
5092 /* Set up DECL as a public symbol that can be defined in multiple
5093 translation units without generating a linker error. */
5096 make_decl_one_only (tree decl)
5098 gcc_assert (TREE_CODE (decl) == VAR_DECL
5099 || TREE_CODE (decl) == FUNCTION_DECL);
5101 TREE_PUBLIC (decl) = 1;
5103 if (SUPPORTS_ONE_ONLY)
5105 #ifdef MAKE_DECL_ONE_ONLY
5106 MAKE_DECL_ONE_ONLY (decl);
5108 DECL_ONE_ONLY (decl) = 1;
5110 else if (TREE_CODE (decl) == VAR_DECL
5111 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
5112 DECL_COMMON (decl) = 1;
5115 gcc_assert (SUPPORTS_WEAK);
5116 DECL_WEAK (decl) = 1;
5121 init_varasm_once (void)
5123 section_htab = htab_create_ggc (31, section_entry_hash,
5124 section_entry_eq, NULL);
5125 object_block_htab = htab_create_ggc (31, object_block_entry_hash,
5126 object_block_entry_eq, NULL);
5127 const_desc_htab = htab_create_ggc (1009, const_desc_hash,
5128 const_desc_eq, NULL);
5130 const_alias_set = new_alias_set ();
5131 shared_constant_pool = create_constant_pool ();
5133 #ifdef TEXT_SECTION_ASM_OP
5134 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
5135 TEXT_SECTION_ASM_OP);
5138 #ifdef DATA_SECTION_ASM_OP
5139 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5140 DATA_SECTION_ASM_OP);
5143 #ifdef SDATA_SECTION_ASM_OP
5144 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5145 SDATA_SECTION_ASM_OP);
5148 #ifdef READONLY_DATA_SECTION_ASM_OP
5149 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
5150 READONLY_DATA_SECTION_ASM_OP);
5153 #ifdef CTORS_SECTION_ASM_OP
5154 ctors_section = get_unnamed_section (0, output_section_asm_op,
5155 CTORS_SECTION_ASM_OP);
5158 #ifdef DTORS_SECTION_ASM_OP
5159 dtors_section = get_unnamed_section (0, output_section_asm_op,
5160 DTORS_SECTION_ASM_OP);
5163 #ifdef BSS_SECTION_ASM_OP
5164 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5165 output_section_asm_op,
5166 BSS_SECTION_ASM_OP);
5169 #ifdef SBSS_SECTION_ASM_OP
5170 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5171 output_section_asm_op,
5172 SBSS_SECTION_ASM_OP);
5175 tls_comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5176 | SECTION_COMMON, emit_tls_common);
5177 lcomm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5178 | SECTION_COMMON, emit_local);
5179 comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5180 | SECTION_COMMON, emit_common);
5182 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5183 bss_noswitch_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS,
5187 targetm.asm_out.init_sections ();
5189 if (readonly_data_section == NULL)
5190 readonly_data_section = text_section;
5194 decl_default_tls_model (tree decl)
5196 enum tls_model kind;
5199 is_local = targetm.binds_local_p (decl);
5203 kind = TLS_MODEL_LOCAL_EXEC;
5205 kind = TLS_MODEL_INITIAL_EXEC;
5208 /* Local dynamic is inefficient when we're not combining the
5209 parts of the address. */
5210 else if (optimize && is_local)
5211 kind = TLS_MODEL_LOCAL_DYNAMIC;
5213 kind = TLS_MODEL_GLOBAL_DYNAMIC;
5214 if (kind < flag_tls_default)
5215 kind = flag_tls_default;
5220 /* Select a set of attributes for section NAME based on the properties
5221 of DECL and whether or not RELOC indicates that DECL's initializer
5222 might contain runtime relocations.
5224 We make the section read-only and executable for a function decl,
5225 read-only for a const data decl, and writable for a non-const data decl. */
5228 default_section_type_flags (tree decl, const char *name, int reloc)
5232 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
5233 flags = SECTION_CODE;
5234 else if (decl && decl_readonly_section (decl, reloc))
5236 else if (current_function_decl
5238 && cfun->unlikely_text_section_name
5239 && strcmp (name, cfun->unlikely_text_section_name) == 0)
5240 flags = SECTION_CODE;
5242 && (!current_function_decl || !cfun)
5243 && strcmp (name, UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
5244 flags = SECTION_CODE;
5246 flags = SECTION_WRITE;
5248 if (decl && DECL_ONE_ONLY (decl))
5249 flags |= SECTION_LINKONCE;
5251 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5252 flags |= SECTION_TLS | SECTION_WRITE;
5254 if (strcmp (name, ".bss") == 0
5255 || strncmp (name, ".bss.", 5) == 0
5256 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
5257 || strcmp (name, ".sbss") == 0
5258 || strncmp (name, ".sbss.", 6) == 0
5259 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
5260 flags |= SECTION_BSS;
5262 if (strcmp (name, ".tdata") == 0
5263 || strncmp (name, ".tdata.", 7) == 0
5264 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
5265 flags |= SECTION_TLS;
5267 if (strcmp (name, ".tbss") == 0
5268 || strncmp (name, ".tbss.", 6) == 0
5269 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
5270 flags |= SECTION_TLS | SECTION_BSS;
5272 /* These three sections have special ELF types. They are neither
5273 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5274 want to print a section type (@progbits or @nobits). If someone
5275 is silly enough to emit code or TLS variables to one of these
5276 sections, then don't handle them specially. */
5277 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
5278 && (strcmp (name, ".init_array") == 0
5279 || strcmp (name, ".fini_array") == 0
5280 || strcmp (name, ".preinit_array") == 0))
5281 flags |= SECTION_NOTYPE;
5286 /* Return true if the target supports some form of global BSS,
5287 either through bss_noswitch_section, or by selecting a BSS
5288 section in TARGET_ASM_SELECT_SECTION. */
5291 have_global_bss_p (void)
5293 return bss_noswitch_section || targetm.have_switchable_bss_sections;
5296 /* Output assembly to switch to section NAME with attribute FLAGS.
5297 Four variants for common object file formats. */
5300 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
5301 unsigned int flags ATTRIBUTE_UNUSED,
5302 tree decl ATTRIBUTE_UNUSED)
5304 /* Some object formats don't support named sections at all. The
5305 front-end should already have flagged this as an error. */
5310 default_elf_asm_named_section (const char *name, unsigned int flags,
5311 tree decl ATTRIBUTE_UNUSED)
5313 char flagchars[10], *f = flagchars;
5315 /* If we have already declared this section, we can use an
5316 abbreviated form to switch back to it -- unless this section is
5317 part of a COMDAT groups, in which case GAS requires the full
5318 declaration every time. */
5319 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5320 && (flags & SECTION_DECLARED))
5322 fprintf (asm_out_file, "\t.section\t%s\n", name);
5326 if (!(flags & SECTION_DEBUG))
5328 if (flags & SECTION_WRITE)
5330 if (flags & SECTION_CODE)
5332 if (flags & SECTION_SMALL)
5334 if (flags & SECTION_MERGE)
5336 if (flags & SECTION_STRINGS)
5338 if (flags & SECTION_TLS)
5340 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5344 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
5346 if (!(flags & SECTION_NOTYPE))
5351 if (flags & SECTION_BSS)
5357 #ifdef ASM_COMMENT_START
5358 /* On platforms that use "@" as the assembly comment character,
5360 if (strcmp (ASM_COMMENT_START, "@") == 0)
5363 fprintf (asm_out_file, format, type);
5365 if (flags & SECTION_ENTSIZE)
5366 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
5367 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5368 fprintf (asm_out_file, ",%s,comdat",
5369 lang_hooks.decls.comdat_group (decl));
5372 putc ('\n', asm_out_file);
5376 default_coff_asm_named_section (const char *name, unsigned int flags,
5377 tree decl ATTRIBUTE_UNUSED)
5379 char flagchars[8], *f = flagchars;
5381 if (flags & SECTION_WRITE)
5383 if (flags & SECTION_CODE)
5387 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
5391 default_pe_asm_named_section (const char *name, unsigned int flags,
5394 default_coff_asm_named_section (name, flags, decl);
5396 if (flags & SECTION_LINKONCE)
5398 /* Functions may have been compiled at various levels of
5399 optimization so we can't use `same_size' here.
5400 Instead, have the linker pick one. */
5401 fprintf (asm_out_file, "\t.linkonce %s\n",
5402 (flags & SECTION_CODE ? "discard" : "same_size"));
5406 /* The lame default section selector. */
5409 default_select_section (tree decl, int reloc,
5410 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
5414 if (decl_readonly_section (decl, reloc))
5415 return readonly_data_section;
5417 else if (TREE_CODE (decl) == CONSTRUCTOR)
5419 if (! ((flag_pic && reloc)
5420 || !TREE_READONLY (decl)
5421 || TREE_SIDE_EFFECTS (decl)
5422 || !TREE_CONSTANT (decl)))
5423 return readonly_data_section;
5425 else if (TREE_CODE (decl) == STRING_CST)
5426 return readonly_data_section;
5427 else if (! (flag_pic && reloc))
5428 return readonly_data_section;
5430 return data_section;
5433 enum section_category
5434 categorize_decl_for_section (tree decl, int reloc)
5436 enum section_category ret;
5438 if (TREE_CODE (decl) == FUNCTION_DECL)
5440 else if (TREE_CODE (decl) == STRING_CST)
5442 if (flag_mudflap) /* or !flag_merge_constants */
5443 return SECCAT_RODATA;
5445 return SECCAT_RODATA_MERGE_STR;
5447 else if (TREE_CODE (decl) == VAR_DECL)
5449 if (bss_initializer_p (decl))
5451 else if (! TREE_READONLY (decl)
5452 || TREE_SIDE_EFFECTS (decl)
5453 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
5455 /* Here the reloc_rw_mask is not testing whether the section should
5456 be read-only or not, but whether the dynamic link will have to
5457 do something. If so, we wish to segregate the data in order to
5458 minimize cache misses inside the dynamic linker. */
5459 if (reloc & targetm.asm_out.reloc_rw_mask ())
5460 ret = reloc == 1 ? SECCAT_DATA_REL_LOCAL : SECCAT_DATA_REL;
5464 else if (reloc & targetm.asm_out.reloc_rw_mask ())
5465 ret = reloc == 1 ? SECCAT_DATA_REL_RO_LOCAL : SECCAT_DATA_REL_RO;
5466 else if (reloc || flag_merge_constants < 2)
5467 /* C and C++ don't allow different variables to share the same
5468 location. -fmerge-all-constants allows even that (at the
5469 expense of not conforming). */
5470 ret = SECCAT_RODATA;
5471 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
5472 ret = SECCAT_RODATA_MERGE_STR_INIT;
5474 ret = SECCAT_RODATA_MERGE_CONST;
5476 else if (TREE_CODE (decl) == CONSTRUCTOR)
5478 if ((reloc & targetm.asm_out.reloc_rw_mask ())
5479 || TREE_SIDE_EFFECTS (decl)
5480 || ! TREE_CONSTANT (decl))
5483 ret = SECCAT_RODATA;
5486 ret = SECCAT_RODATA;
5488 /* There are no read-only thread-local sections. */
5489 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5491 /* Note that this would be *just* SECCAT_BSS, except that there's
5492 no concept of a read-only thread-local-data section. */
5493 if (ret == SECCAT_BSS
5494 || (flag_zero_initialized_in_bss
5495 && initializer_zerop (DECL_INITIAL (decl))))
5501 /* If the target uses small data sections, select it. */
5502 else if (targetm.in_small_data_p (decl))
5504 if (ret == SECCAT_BSS)
5506 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
5507 ret = SECCAT_SRODATA;
5516 decl_readonly_section (tree decl, int reloc)
5518 switch (categorize_decl_for_section (decl, reloc))
5521 case SECCAT_RODATA_MERGE_STR:
5522 case SECCAT_RODATA_MERGE_STR_INIT:
5523 case SECCAT_RODATA_MERGE_CONST:
5524 case SECCAT_SRODATA:
5533 /* Select a section based on the above categorization. */
5536 default_elf_select_section (tree decl, int reloc,
5537 unsigned HOST_WIDE_INT align)
5540 switch (categorize_decl_for_section (decl, reloc))
5543 /* We're not supposed to be called on FUNCTION_DECLs. */
5546 return readonly_data_section;
5547 case SECCAT_RODATA_MERGE_STR:
5548 return mergeable_string_section (decl, align, 0);
5549 case SECCAT_RODATA_MERGE_STR_INIT:
5550 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
5551 case SECCAT_RODATA_MERGE_CONST:
5552 return mergeable_constant_section (DECL_MODE (decl), align, 0);
5553 case SECCAT_SRODATA:
5557 return data_section;
5558 case SECCAT_DATA_REL:
5559 sname = ".data.rel";
5561 case SECCAT_DATA_REL_LOCAL:
5562 sname = ".data.rel.local";
5564 case SECCAT_DATA_REL_RO:
5565 sname = ".data.rel.ro";
5567 case SECCAT_DATA_REL_RO_LOCAL:
5568 sname = ".data.rel.ro.local";
5593 return get_named_section (decl, sname, reloc);
5596 /* Construct a unique section name based on the decl name and the
5597 categorization performed above. */
5600 default_unique_section (tree decl, int reloc)
5602 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
5603 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
5604 const char *prefix, *name;
5608 switch (categorize_decl_for_section (decl, reloc))
5611 prefix = one_only ? ".gnu.linkonce.t." : ".text.";
5614 case SECCAT_RODATA_MERGE_STR:
5615 case SECCAT_RODATA_MERGE_STR_INIT:
5616 case SECCAT_RODATA_MERGE_CONST:
5617 prefix = one_only ? ".gnu.linkonce.r." : ".rodata.";
5619 case SECCAT_SRODATA:
5620 prefix = one_only ? ".gnu.linkonce.s2." : ".sdata2.";
5623 prefix = one_only ? ".gnu.linkonce.d." : ".data.";
5625 case SECCAT_DATA_REL:
5626 prefix = one_only ? ".gnu.linkonce.d.rel." : ".data.rel.";
5628 case SECCAT_DATA_REL_LOCAL:
5629 prefix = one_only ? ".gnu.linkonce.d.rel.local." : ".data.rel.local.";
5631 case SECCAT_DATA_REL_RO:
5632 prefix = one_only ? ".gnu.linkonce.d.rel.ro." : ".data.rel.ro.";
5634 case SECCAT_DATA_REL_RO_LOCAL:
5635 prefix = one_only ? ".gnu.linkonce.d.rel.ro.local."
5636 : ".data.rel.ro.local.";
5639 prefix = one_only ? ".gnu.linkonce.s." : ".sdata.";
5642 prefix = one_only ? ".gnu.linkonce.b." : ".bss.";
5645 prefix = one_only ? ".gnu.linkonce.sb." : ".sbss.";
5648 prefix = one_only ? ".gnu.linkonce.td." : ".tdata.";
5651 prefix = one_only ? ".gnu.linkonce.tb." : ".tbss.";
5656 plen = strlen (prefix);
5658 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5659 name = targetm.strip_name_encoding (name);
5660 nlen = strlen (name);
5662 string = alloca (nlen + plen + 1);
5663 memcpy (string, prefix, plen);
5664 memcpy (string + plen, name, nlen + 1);
5666 DECL_SECTION_NAME (decl) = build_string (nlen + plen, string);
5669 /* Like compute_reloc_for_constant, except for an RTX. The return value
5670 is a mask for which bit 1 indicates a global relocation, and bit 0
5671 indicates a local relocation. */
5674 compute_reloc_for_rtx_1 (rtx *xp, void *data)
5679 switch (GET_CODE (x))
5682 *preloc |= SYMBOL_REF_LOCAL_P (x) ? 1 : 2;
5695 compute_reloc_for_rtx (rtx x)
5699 switch (GET_CODE (x))
5705 for_each_rtx (&x, compute_reloc_for_rtx_1, &reloc);
5714 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED,
5716 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
5718 if (compute_reloc_for_rtx (x) & targetm.asm_out.reloc_rw_mask ())
5719 return data_section;
5721 return readonly_data_section;
5725 default_elf_select_rtx_section (enum machine_mode mode, rtx x,
5726 unsigned HOST_WIDE_INT align)
5728 int reloc = compute_reloc_for_rtx (x);
5730 /* ??? Handle small data here somehow. */
5732 if (reloc & targetm.asm_out.reloc_rw_mask ())
5735 return get_named_section (NULL, ".data.rel.ro.local", 1);
5737 return get_named_section (NULL, ".data.rel.ro", 3);
5740 return mergeable_constant_section (mode, align, 0);
5743 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
5746 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
5751 /* Careful not to prod global register variables. */
5754 symbol = XEXP (rtl, 0);
5755 if (GET_CODE (symbol) != SYMBOL_REF)
5758 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_HAS_BLOCK_INFO;
5759 if (TREE_CODE (decl) == FUNCTION_DECL)
5760 flags |= SYMBOL_FLAG_FUNCTION;
5761 if (targetm.binds_local_p (decl))
5762 flags |= SYMBOL_FLAG_LOCAL;
5763 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5764 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
5765 else if (targetm.in_small_data_p (decl))
5766 flags |= SYMBOL_FLAG_SMALL;
5767 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
5768 being PUBLIC, the thing *must* be defined in this translation unit.
5769 Prevent this buglet from being propagated into rtl code as well. */
5770 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
5771 flags |= SYMBOL_FLAG_EXTERNAL;
5773 SYMBOL_REF_FLAGS (symbol) = flags;
5776 /* By default, we do nothing for encode_section_info, so we need not
5777 do anything but discard the '*' marker. */
5780 default_strip_name_encoding (const char *str)
5782 return str + (*str == '*');
5785 #ifdef ASM_OUTPUT_DEF
5786 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
5787 anchor relative to ".", the current section position. */
5790 default_asm_output_anchor (rtx symbol)
5794 sprintf (buffer, ". + " HOST_WIDE_INT_PRINT_DEC,
5795 SYMBOL_REF_BLOCK_OFFSET (symbol));
5796 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
5800 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
5803 default_use_anchors_for_symbol_p (rtx symbol)
5808 /* Don't use anchors for mergeable sections. The linker might move
5809 the objects around. */
5810 sect = SYMBOL_REF_BLOCK (symbol)->sect;
5811 if (sect->common.flags & SECTION_MERGE)
5814 /* Don't use anchors for small data sections. The small data register
5815 acts as an anchor for such sections. */
5816 if (sect->common.flags & SECTION_SMALL)
5819 decl = SYMBOL_REF_DECL (symbol);
5820 if (decl && DECL_P (decl))
5822 /* Don't use section anchors for decls that might be defined by
5824 if (!targetm.binds_local_p (decl))
5827 /* Don't use section anchors for decls that will be placed in a
5828 small data section. */
5829 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
5830 one above. The problem is that we only use SECTION_SMALL for
5831 sections that should be marked as small in the section directive. */
5832 if (targetm.in_small_data_p (decl))
5838 /* Assume ELF-ish defaults, since that's pretty much the most liberal
5839 wrt cross-module name binding. */
5842 default_binds_local_p (tree exp)
5844 return default_binds_local_p_1 (exp, flag_shlib);
5848 default_binds_local_p_1 (tree exp, int shlib)
5852 /* A non-decl is an entry in the constant pool. */
5855 /* Weakrefs may not bind locally, even though the weakref itself is
5856 always static and therefore local. */
5857 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp)))
5859 /* Static variables are always local. */
5860 else if (! TREE_PUBLIC (exp))
5862 /* A variable is local if the user has said explicitly that it will
5864 else if (DECL_VISIBILITY_SPECIFIED (exp)
5865 && DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
5867 /* Variables defined outside this object might not be local. */
5868 else if (DECL_EXTERNAL (exp))
5870 /* If defined in this object and visibility is not default, must be
5872 else if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
5874 /* Default visibility weak data can be overridden by a strong symbol
5875 in another module and so are not local. */
5876 else if (DECL_WEAK (exp))
5878 /* If PIC, then assume that any global name can be overridden by
5879 symbols resolved from other modules, unless we are compiling with
5880 -fwhole-program, which assumes that names are local. */
5882 local_p = flag_whole_program;
5883 /* Uninitialized COMMON variable may be unified with symbols
5884 resolved from other modules. */
5885 else if (DECL_COMMON (exp)
5886 && (DECL_INITIAL (exp) == NULL
5887 || DECL_INITIAL (exp) == error_mark_node))
5889 /* Otherwise we're left with initialized (or non-common) global data
5890 which is of necessity defined locally. */
5897 /* Determine whether or not a pointer mode is valid. Assume defaults
5898 of ptr_mode or Pmode - can be overridden. */
5900 default_valid_pointer_mode (enum machine_mode mode)
5902 return (mode == ptr_mode || mode == Pmode);
5905 /* Default function to output code that will globalize a label. A
5906 target must define GLOBAL_ASM_OP or provide its own function to
5907 globalize a label. */
5908 #ifdef GLOBAL_ASM_OP
5910 default_globalize_label (FILE * stream, const char *name)
5912 fputs (GLOBAL_ASM_OP, stream);
5913 assemble_name (stream, name);
5914 putc ('\n', stream);
5916 #endif /* GLOBAL_ASM_OP */
5918 /* Default function to output a label for unwind information. The
5919 default is to do nothing. A target that needs nonlocal labels for
5920 unwind information must provide its own function to do this. */
5922 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
5923 tree decl ATTRIBUTE_UNUSED,
5924 int for_eh ATTRIBUTE_UNUSED,
5925 int empty ATTRIBUTE_UNUSED)
5929 /* Default function to output a label to divide up the exception table.
5930 The default is to do nothing. A target that needs/wants to divide
5931 up the table must provide it's own function to do this. */
5933 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
5937 /* This is how to output an internal numbered label where PREFIX is
5938 the class of label and LABELNO is the number within the class. */
5941 default_internal_label (FILE *stream, const char *prefix,
5942 unsigned long labelno)
5944 char *const buf = alloca (40 + strlen (prefix));
5945 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
5946 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
5949 /* This is the default behavior at the beginning of a file. It's
5950 controlled by two other target-hook toggles. */
5952 default_file_start (void)
5954 if (targetm.file_start_app_off && !flag_verbose_asm)
5955 fputs (ASM_APP_OFF, asm_out_file);
5957 if (targetm.file_start_file_directive)
5958 output_file_directive (asm_out_file, main_input_filename);
5961 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
5962 which emits a special section directive used to indicate whether or
5963 not this object file needs an executable stack. This is primarily
5964 a GNU extension to ELF but could be used on other targets. */
5966 int trampolines_created;
5969 file_end_indicate_exec_stack (void)
5971 unsigned int flags = SECTION_DEBUG;
5972 if (trampolines_created)
5973 flags |= SECTION_CODE;
5975 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
5978 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
5979 a get_unnamed_section callback. */
5982 output_section_asm_op (const void *directive)
5984 fprintf (asm_out_file, "%s\n", (const char *) directive);
5987 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
5988 the current section is NEW_SECTION. */
5991 switch_to_section (section *new_section)
5993 if (in_section == new_section)
5996 if (new_section->common.flags & SECTION_FORGET)
5999 in_section = new_section;
6001 switch (SECTION_STYLE (new_section))
6005 && !cfun->unlikely_text_section_name
6006 && strcmp (new_section->named.name,
6007 UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
6008 cfun->unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
6010 targetm.asm_out.named_section (new_section->named.name,
6011 new_section->named.common.flags,
6012 new_section->named.decl);
6015 case SECTION_UNNAMED:
6016 new_section->unnamed.callback (new_section->unnamed.data);
6019 case SECTION_NOSWITCH:
6024 new_section->common.flags |= SECTION_DECLARED;
6027 /* If block symbol SYMBOL has not yet been assigned an offset, place
6028 it at the end of its block. */
6031 place_block_symbol (rtx symbol)
6033 unsigned HOST_WIDE_INT size, mask, offset;
6034 struct constant_descriptor_rtx *desc;
6035 unsigned int alignment;
6036 struct object_block *block;
6039 gcc_assert (SYMBOL_REF_BLOCK (symbol));
6040 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
6043 /* Work out the symbol's size and alignment. */
6044 if (CONSTANT_POOL_ADDRESS_P (symbol))
6046 desc = SYMBOL_REF_CONSTANT (symbol);
6047 alignment = desc->align;
6048 size = GET_MODE_SIZE (desc->mode);
6050 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6052 decl = SYMBOL_REF_DECL (symbol);
6053 alignment = get_constant_alignment (decl);
6054 size = get_constant_size (decl);
6058 decl = SYMBOL_REF_DECL (symbol);
6059 alignment = DECL_ALIGN (decl);
6060 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6063 /* Calculate the object's offset from the start of the block. */
6064 block = SYMBOL_REF_BLOCK (symbol);
6065 mask = alignment / BITS_PER_UNIT - 1;
6066 offset = (block->size + mask) & ~mask;
6067 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
6069 /* Record the block's new alignment and size. */
6070 block->alignment = MAX (block->alignment, alignment);
6071 block->size = offset + size;
6073 VEC_safe_push (rtx, gc, block->objects, symbol);
6076 /* Return the anchor that should be used to address byte offset OFFSET
6077 from the first object in BLOCK. MODEL is the TLS model used
6081 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
6082 enum tls_model model)
6085 unsigned int begin, middle, end;
6086 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
6089 /* Work out the anchor's offset. Use an offset of 0 for the first
6090 anchor so that we don't pessimize the case where we take the address
6091 of a variable at the beginning of the block. This is particularly
6092 useful when a block has only one variable assigned to it.
6094 We try to place anchors RANGE bytes apart, so there can then be
6095 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6096 a ptr_mode offset. With some target settings, the lowest such
6097 anchor might be out of range for the lowest ptr_mode offset;
6098 likewise the highest anchor for the highest offset. Use anchors
6099 at the extreme ends of the ptr_mode range in such cases.
6101 All arithmetic uses unsigned integers in order to avoid
6103 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
6104 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
6105 range = max_offset - min_offset + 1;
6110 bias = 1 << (GET_MODE_BITSIZE (ptr_mode) - 1);
6113 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
6114 delta -= delta % range;
6117 offset = (HOST_WIDE_INT) (-delta);
6121 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
6122 delta -= delta % range;
6123 if (delta > bias - 1)
6125 offset = (HOST_WIDE_INT) delta;
6129 /* Do a binary search to see if there's already an anchor we can use.
6130 Set BEGIN to the new anchor's index if not. */
6132 end = VEC_length (rtx, block->anchors);
6133 while (begin != end)
6135 middle = (end + begin) / 2;
6136 anchor = VEC_index (rtx, block->anchors, middle);
6137 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
6139 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
6141 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
6143 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
6149 /* Create a new anchor with a unique label. */
6150 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
6151 anchor = create_block_symbol (ggc_strdup (label), block, offset);
6152 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
6153 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
6155 /* Insert it at index BEGIN. */
6156 VEC_safe_insert (rtx, gc, block->anchors, begin, anchor);
6160 /* Output the objects in BLOCK. */
6163 output_object_block (struct object_block *block)
6165 struct constant_descriptor_rtx *desc;
6167 HOST_WIDE_INT offset;
6171 if (block->objects == NULL)
6174 /* Switch to the section and make sure that the first byte is
6175 suitably aligned. */
6176 switch_to_section (block->sect);
6177 assemble_align (block->alignment);
6179 /* Define the values of all anchors relative to the current section
6181 for (i = 0; VEC_iterate (rtx, block->anchors, i, symbol); i++)
6182 targetm.asm_out.output_anchor (symbol);
6184 /* Output the objects themselves. */
6186 for (i = 0; VEC_iterate (rtx, block->objects, i, symbol); i++)
6188 /* Move to the object's offset, padding with zeros if necessary. */
6189 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
6190 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
6191 if (CONSTANT_POOL_ADDRESS_P (symbol))
6193 desc = SYMBOL_REF_CONSTANT (symbol);
6194 output_constant_pool_1 (desc, 1);
6195 offset += GET_MODE_SIZE (desc->mode);
6197 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6199 decl = SYMBOL_REF_DECL (symbol);
6200 assemble_constant_contents (decl, XSTR (symbol, 0),
6201 get_constant_alignment (decl));
6202 offset += get_constant_size (decl);
6206 decl = SYMBOL_REF_DECL (symbol);
6207 assemble_variable_contents (decl, XSTR (symbol, 0), false);
6208 offset += tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6213 /* A htab_traverse callback used to call output_object_block for
6214 each member of object_block_htab. */
6217 output_object_block_htab (void **slot, void *data ATTRIBUTE_UNUSED)
6219 output_object_block ((struct object_block *) (*slot));
6223 /* Output the definitions of all object_blocks. */
6226 output_object_blocks (void)
6228 htab_traverse (object_block_htab, output_object_block_htab, NULL);
6231 /* Emit text to declare externally defined symbols. It is needed to
6232 properly support non-default visibility. */
6234 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED,
6236 const char *name ATTRIBUTE_UNUSED)
6238 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
6239 set in order to avoid putting out names that are never really
6241 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
6242 && targetm.binds_local_p (decl))
6243 maybe_assemble_visibility (decl);
6246 #include "gt-varasm.h"