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 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
23 /* This file handles generation of all the assembler code
24 *except* the instructions of a function.
25 This includes declarations of variables and their initial values.
27 We also output the assembler code for constants stored in memory
28 and are responsible for combining constants with the same value. */
37 #include "hard-reg-set.h"
46 #include "langhooks.h"
51 #ifdef XCOFF_DEBUGGING_INFO
52 #include "xcoffout.h" /* Needed for external data
53 declarations for e.g. AIX 4.x. */
56 #ifndef TRAMPOLINE_ALIGNMENT
57 #define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY
61 #define ASM_STABS_OP "\t.stabs\t"
64 /* The (assembler) name of the first globally-visible object output. */
65 const char *first_global_object_name
;
66 const char *weak_global_object_name
;
69 struct constant_descriptor_rtx
;
73 #define MAX_RTX_HASH_TABLE 61
75 struct varasm_status
GTY(())
77 /* Hash facility for making memory-constants
78 from constant rtl-expressions. It is used on RISC machines
79 where immediate integer arguments and constant addresses are restricted
80 so that such constants must be stored in memory.
82 This pool of constants is reinitialized for each function
83 so each function gets its own constants-pool that comes right before
85 struct constant_descriptor_rtx
** GTY ((length ("MAX_RTX_HASH_TABLE")))
86 x_const_rtx_hash_table
;
87 struct pool_constant
** GTY ((length ("MAX_RTX_HASH_TABLE")))
88 x_const_rtx_sym_hash_table
;
90 /* Pointers to first and last constant in pool. */
91 struct pool_constant
*x_first_pool
;
92 struct pool_constant
*x_last_pool
;
94 /* Current offset in constant pool (does not include any machine-specific
96 HOST_WIDE_INT x_pool_offset
;
99 #define const_rtx_hash_table (cfun->varasm->x_const_rtx_hash_table)
100 #define const_rtx_sym_hash_table (cfun->varasm->x_const_rtx_sym_hash_table)
101 #define first_pool (cfun->varasm->x_first_pool)
102 #define last_pool (cfun->varasm->x_last_pool)
103 #define pool_offset (cfun->varasm->x_pool_offset)
105 /* Number for making the label on the next
106 constant that is stored in memory. */
110 /* Number for making the label on the next
111 static variable internal to a function. */
115 /* Carry information from ASM_DECLARE_OBJECT_NAME
116 to ASM_FINISH_DECLARE_OBJECT. */
118 int size_directive_output
;
120 /* The last decl for which assemble_variable was called,
121 if it did ASM_DECLARE_OBJECT_NAME.
122 If the last call to assemble_variable didn't do that,
125 tree last_assemble_variable_decl
;
127 /* RTX_UNCHANGING_P in a MEM can mean it is stored into, for initialization.
128 So giving constant the alias set for the type will allow such
129 initializations to appear to conflict with the load of the constant. We
130 avoid this by giving all constants an alias set for just constants.
131 Since there will be no stores to that alias set, nothing will ever
132 conflict with them. */
134 static HOST_WIDE_INT const_alias_set
;
136 static const char *strip_reg_name
PARAMS ((const char *));
137 static int contains_pointers_p
PARAMS ((tree
));
138 static void decode_addr_const
PARAMS ((tree
, struct addr_const
*));
139 static unsigned int const_hash
PARAMS ((tree
));
140 static unsigned int const_hash_1
PARAMS ((tree
));
141 static int compare_constant
PARAMS ((tree
, tree
));
142 static tree copy_constant
PARAMS ((tree
));
143 static void output_constant_def_contents
PARAMS ((tree
, int, int));
144 static void decode_rtx_const
PARAMS ((enum machine_mode
, rtx
,
145 struct rtx_const
*));
146 static unsigned int const_hash_rtx
PARAMS ((enum machine_mode
, rtx
));
147 static int compare_constant_rtx
148 PARAMS ((enum machine_mode
, rtx
, struct constant_descriptor_rtx
*));
149 static struct constant_descriptor_rtx
* record_constant_rtx
150 PARAMS ((enum machine_mode
, rtx
));
151 static struct pool_constant
*find_pool_constant
PARAMS ((struct function
*, rtx
));
152 static void mark_constant_pool
PARAMS ((void));
153 static void mark_constants
PARAMS ((rtx
));
154 static int mark_constant
PARAMS ((rtx
*current_rtx
, void *data
));
155 static int output_addressed_constants
PARAMS ((tree
));
156 static void output_after_function_constants
PARAMS ((void));
157 static unsigned HOST_WIDE_INT array_size_for_constructor
PARAMS ((tree
));
158 static unsigned min_align
PARAMS ((unsigned, unsigned));
159 static void output_constructor
PARAMS ((tree
, HOST_WIDE_INT
,
161 static void globalize_decl
PARAMS ((tree
));
162 static void maybe_assemble_visibility
PARAMS ((tree
));
163 static int in_named_entry_eq
PARAMS ((const PTR
, const PTR
));
164 static hashval_t in_named_entry_hash
PARAMS ((const PTR
));
165 #ifdef ASM_OUTPUT_BSS
166 static void asm_output_bss
PARAMS ((FILE *, tree
, const char *, int, int));
168 #ifdef BSS_SECTION_ASM_OP
169 #ifdef ASM_OUTPUT_ALIGNED_BSS
170 static void asm_output_aligned_bss
PARAMS ((FILE *, tree
, const char *,
173 #endif /* BSS_SECTION_ASM_OP */
174 static hashval_t const_str_htab_hash
PARAMS ((const void *x
));
175 static int const_str_htab_eq
PARAMS ((const void *x
, const void *y
));
176 static bool asm_emit_uninitialised
PARAMS ((tree
, const char*, int, int));
177 static void resolve_unique_section
PARAMS ((tree
, int, int));
178 static void mark_weak
PARAMS ((tree
));
180 static enum in_section
{ no_section
, in_text
, in_data
, in_named
181 #ifdef BSS_SECTION_ASM_OP
184 #ifdef CTORS_SECTION_ASM_OP
187 #ifdef DTORS_SECTION_ASM_OP
190 #ifdef READONLY_DATA_SECTION_ASM_OP
193 #ifdef EXTRA_SECTIONS
196 } in_section
= no_section
;
198 /* Return a nonzero value if DECL has a section attribute. */
199 #ifndef IN_NAMED_SECTION
200 #define IN_NAMED_SECTION(DECL) \
201 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
202 && DECL_SECTION_NAME (DECL) != NULL_TREE)
205 /* Text of section name when in_section == in_named. */
206 static const char *in_named_name
;
208 /* Hash table of flags that have been used for a particular named section. */
210 struct in_named_entry
217 static htab_t in_named_htab
;
219 /* Define functions like text_section for any extra sections. */
220 #ifdef EXTRA_SECTION_FUNCTIONS
221 EXTRA_SECTION_FUNCTIONS
224 /* Tell assembler to switch to text section. */
229 if (in_section
!= in_text
)
231 in_section
= in_text
;
235 fprintf (asm_out_file
, "%s\n", TEXT_SECTION_ASM_OP
);
240 /* Tell assembler to switch to data section. */
245 if (in_section
!= in_data
)
247 in_section
= in_data
;
248 if (flag_shared_data
)
250 #ifdef SHARED_SECTION_ASM_OP
251 fprintf (asm_out_file
, "%s\n", SHARED_SECTION_ASM_OP
);
253 fprintf (asm_out_file
, "%s\n", DATA_SECTION_ASM_OP
);
257 fprintf (asm_out_file
, "%s\n", DATA_SECTION_ASM_OP
);
261 /* Tell assembler to ALWAYS switch to data section, in case
262 it's not sure where it is. */
265 force_data_section ()
267 in_section
= no_section
;
271 /* Tell assembler to switch to read-only data section. This is normally
275 readonly_data_section ()
277 #ifdef READONLY_DATA_SECTION
278 READONLY_DATA_SECTION (); /* Note this can call data_section. */
280 #ifdef READONLY_DATA_SECTION_ASM_OP
281 if (in_section
!= in_readonly_data
)
283 in_section
= in_readonly_data
;
284 fputs (READONLY_DATA_SECTION_ASM_OP
, asm_out_file
);
285 fputc ('\n', asm_out_file
);
293 /* Determine if we're in the text section. */
298 return in_section
== in_text
;
301 /* Determine if we're in the data section. */
306 return in_section
== in_data
;
309 /* Helper routines for maintaining in_named_htab. */
312 in_named_entry_eq (p1
, p2
)
316 const struct in_named_entry
*old
= p1
;
317 const char *new = p2
;
319 return strcmp (old
->name
, new) == 0;
323 in_named_entry_hash (p
)
326 const struct in_named_entry
*old
= p
;
327 return htab_hash_string (old
->name
);
330 /* If SECTION has been seen before as a named section, return the flags
331 that were used. Otherwise, return 0. Note, that 0 is a perfectly valid
332 set of flags for a section to have, so 0 does not mean that the section
333 has not been seen. */
336 get_named_section_flags (section
)
339 struct in_named_entry
**slot
;
341 slot
= (struct in_named_entry
**)
342 htab_find_slot_with_hash (in_named_htab
, section
,
343 htab_hash_string (section
), NO_INSERT
);
345 return slot
? (*slot
)->flags
: 0;
348 /* Returns true if the section has been declared before. Sets internal
349 flag on this section in in_named_hash so subsequent calls on this
350 section will return false. */
353 named_section_first_declaration (name
)
356 struct in_named_entry
**slot
;
358 slot
= (struct in_named_entry
**)
359 htab_find_slot_with_hash (in_named_htab
, name
,
360 htab_hash_string (name
), NO_INSERT
);
361 if (! (*slot
)->declared
)
363 (*slot
)->declared
= true;
373 /* Record FLAGS for SECTION. If SECTION was previously recorded with a
374 different set of flags, return false. */
377 set_named_section_flags (section
, flags
)
381 struct in_named_entry
**slot
, *entry
;
383 slot
= (struct in_named_entry
**)
384 htab_find_slot_with_hash (in_named_htab
, section
,
385 htab_hash_string (section
), INSERT
);
390 entry
= (struct in_named_entry
*) xmalloc (sizeof (*entry
));
392 entry
->name
= ggc_strdup (section
);
393 entry
->flags
= flags
;
394 entry
->declared
= false;
396 else if (entry
->flags
!= flags
)
402 /* Tell assembler to change to section NAME with attributes FLAGS. */
405 named_section_flags (name
, flags
)
409 if (in_section
!= in_named
|| strcmp (name
, in_named_name
) != 0)
411 if (! set_named_section_flags (name
, flags
))
414 (*targetm
.asm_out
.named_section
) (name
, flags
);
416 if (flags
& SECTION_FORGET
)
417 in_section
= no_section
;
420 in_named_name
= ggc_strdup (name
);
421 in_section
= in_named
;
426 /* Tell assembler to change to section NAME for DECL.
427 If DECL is NULL, just switch to section NAME.
428 If NAME is NULL, get the name from DECL.
429 If RELOC is 1, the initializer for DECL contains relocs. */
432 named_section (decl
, name
, reloc
)
439 if (decl
!= NULL_TREE
&& !DECL_P (decl
))
442 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
444 flags
= (* targetm
.section_type_flags
) (decl
, name
, reloc
);
446 /* Sanity check user variables for flag changes. Non-user
447 section flag changes will abort in named_section_flags.
448 However, don't complain if SECTION_OVERRIDE is set.
449 We trust that the setter knows that it is safe to ignore
450 the default flags for this decl. */
451 if (decl
&& ! set_named_section_flags (name
, flags
))
453 flags
= get_named_section_flags (name
);
454 if ((flags
& SECTION_OVERRIDE
) == 0)
455 error_with_decl (decl
, "%s causes a section type conflict");
458 named_section_flags (name
, flags
);
461 /* If required, set DECL_SECTION_NAME to a unique name. */
464 resolve_unique_section (decl
, reloc
, flag_function_or_data_sections
)
466 int reloc ATTRIBUTE_UNUSED
;
467 int flag_function_or_data_sections
;
469 if (DECL_SECTION_NAME (decl
) == NULL_TREE
470 && targetm
.have_named_sections
471 && (flag_function_or_data_sections
472 || DECL_ONE_ONLY (decl
)))
473 (*targetm
.asm_out
.unique_section
) (decl
, reloc
);
476 #ifdef BSS_SECTION_ASM_OP
478 /* Tell the assembler to switch to the bss section. */
483 if (in_section
!= in_bss
)
485 #ifdef SHARED_BSS_SECTION_ASM_OP
486 if (flag_shared_data
)
487 fprintf (asm_out_file
, "%s\n", SHARED_BSS_SECTION_ASM_OP
);
490 fprintf (asm_out_file
, "%s\n", BSS_SECTION_ASM_OP
);
496 #ifdef ASM_OUTPUT_BSS
498 /* Utility function for ASM_OUTPUT_BSS for targets to use if
499 they don't support alignments in .bss.
500 ??? It is believed that this function will work in most cases so such
501 support is localized here. */
504 asm_output_bss (file
, decl
, name
, size
, rounded
)
506 tree decl ATTRIBUTE_UNUSED
;
508 int size ATTRIBUTE_UNUSED
, rounded
;
510 (*targetm
.asm_out
.globalize_label
) (file
, name
);
512 #ifdef ASM_DECLARE_OBJECT_NAME
513 last_assemble_variable_decl
= decl
;
514 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
516 /* Standard thing is just output label for the object. */
517 ASM_OUTPUT_LABEL (file
, name
);
518 #endif /* ASM_DECLARE_OBJECT_NAME */
519 ASM_OUTPUT_SKIP (file
, rounded
? rounded
: 1);
524 #ifdef ASM_OUTPUT_ALIGNED_BSS
526 /* Utility function for targets to use in implementing
527 ASM_OUTPUT_ALIGNED_BSS.
528 ??? It is believed that this function will work in most cases so such
529 support is localized here. */
532 asm_output_aligned_bss (file
, decl
, name
, size
, align
)
534 tree decl ATTRIBUTE_UNUSED
;
539 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
540 #ifdef ASM_DECLARE_OBJECT_NAME
541 last_assemble_variable_decl
= decl
;
542 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
544 /* Standard thing is just output label for the object. */
545 ASM_OUTPUT_LABEL (file
, name
);
546 #endif /* ASM_DECLARE_OBJECT_NAME */
547 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
552 #endif /* BSS_SECTION_ASM_OP */
554 /* Switch to the section for function DECL.
556 If DECL is NULL_TREE, switch to the text section.
557 ??? It's not clear that we will ever be passed NULL_TREE, but it's
558 safer to handle it. */
561 function_section (decl
)
564 if (decl
!= NULL_TREE
565 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
566 named_section (decl
, (char *) 0, 0);
571 /* Switch to section for variable DECL. RELOC is the same as the
572 argument to SELECT_SECTION. */
575 variable_section (decl
, reloc
)
579 if (IN_NAMED_SECTION (decl
))
580 named_section (decl
, NULL
, reloc
);
582 (*targetm
.asm_out
.select_section
) (decl
, reloc
, DECL_ALIGN (decl
));
585 /* Tell assembler to switch to the section for string merging. */
588 mergeable_string_section (decl
, align
, flags
)
589 tree decl ATTRIBUTE_UNUSED
;
590 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
;
591 unsigned int flags ATTRIBUTE_UNUSED
;
593 #ifdef HAVE_GAS_SHF_MERGE
594 if (flag_merge_constants
595 && TREE_CODE (decl
) == STRING_CST
596 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
598 && TREE_STRING_LENGTH (decl
) >= int_size_in_bytes (TREE_TYPE (decl
)))
600 enum machine_mode mode
;
601 unsigned int modesize
;
606 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
607 modesize
= GET_MODE_BITSIZE (mode
);
608 if (modesize
>= 8 && modesize
<= 256
609 && (modesize
& (modesize
- 1)) == 0)
611 if (align
< modesize
)
614 str
= TREE_STRING_POINTER (decl
);
615 len
= TREE_STRING_LENGTH (decl
);
616 unit
= GET_MODE_SIZE (mode
);
618 /* Check for embedded NUL characters. */
619 for (i
= 0; i
< len
; i
+= unit
)
621 for (j
= 0; j
< unit
; j
++)
622 if (str
[i
+ j
] != '\0')
629 sprintf (name
, ".rodata.str%d.%d", modesize
/ 8,
631 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
632 if (!i
&& modesize
< align
)
634 /* A "" string with requested alignment greater than
635 character size might cause a problem:
636 if some other string required even bigger
637 alignment than "", then linker might think the
638 "" is just part of padding after some other string
639 and not put it into the hash table initially.
640 But this means "" could have smaller alignment
642 #ifdef ASM_OUTPUT_SECTION_START
643 named_section_flags (name
, flags
);
644 ASM_OUTPUT_SECTION_START (asm_out_file
);
646 readonly_data_section ();
651 named_section_flags (name
, flags
);
657 readonly_data_section ();
660 /* Tell assembler to switch to the section for constant merging. */
663 mergeable_constant_section (mode
, align
, flags
)
664 enum machine_mode mode ATTRIBUTE_UNUSED
;
665 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
;
666 unsigned int flags ATTRIBUTE_UNUSED
;
668 #ifdef HAVE_GAS_SHF_MERGE
669 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
671 if (flag_merge_constants
677 && (align
& (align
- 1)) == 0)
681 sprintf (name
, ".rodata.cst%d", (int) (align
/ 8));
682 flags
|= (align
/ 8) | SECTION_MERGE
;
683 named_section_flags (name
, flags
);
687 readonly_data_section ();
690 /* Given NAME, a putative register name, discard any customary prefixes. */
693 strip_reg_name (name
)
696 #ifdef REGISTER_PREFIX
697 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
698 name
+= strlen (REGISTER_PREFIX
);
700 if (name
[0] == '%' || name
[0] == '#')
705 /* Decode an `asm' spec for a declaration as a register name.
706 Return the register number, or -1 if nothing specified,
707 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
708 or -3 if ASMSPEC is `cc' and is not recognized,
709 or -4 if ASMSPEC is `memory' and is not recognized.
710 Accept an exact spelling or a decimal number.
711 Prefixes such as % are optional. */
714 decode_reg_name (asmspec
)
721 /* Get rid of confusing prefixes. */
722 asmspec
= strip_reg_name (asmspec
);
724 /* Allow a decimal number as a "register name". */
725 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
726 if (! ISDIGIT (asmspec
[i
]))
728 if (asmspec
[0] != 0 && i
< 0)
731 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
737 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
739 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
742 #ifdef ADDITIONAL_REGISTER_NAMES
744 static const struct { const char *const name
; const int number
; } table
[]
745 = ADDITIONAL_REGISTER_NAMES
;
747 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
748 if (! strcmp (asmspec
, table
[i
].name
))
749 return table
[i
].number
;
751 #endif /* ADDITIONAL_REGISTER_NAMES */
753 if (!strcmp (asmspec
, "memory"))
756 if (!strcmp (asmspec
, "cc"))
765 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
766 have static storage duration. In other words, it should not be an
767 automatic variable, including PARM_DECLs.
769 There is, however, one exception: this function handles variables
770 explicitly placed in a particular register by the user.
772 ASMSPEC, if not 0, is the string which the user specified as the
773 assembler symbol name.
775 This is never called for PARM_DECL nodes. */
778 make_decl_rtl (decl
, asmspec
)
782 int top_level
= (DECL_CONTEXT (decl
) == NULL_TREE
);
783 const char *name
= 0;
784 const char *new_name
= 0;
788 /* Check that we are not being given an automatic variable. */
789 /* A weak alias has TREE_PUBLIC set but not the other bits. */
790 if (TREE_CODE (decl
) == PARM_DECL
791 || TREE_CODE (decl
) == RESULT_DECL
792 || (TREE_CODE (decl
) == VAR_DECL
793 && !TREE_STATIC (decl
)
794 && !TREE_PUBLIC (decl
)
795 && !DECL_EXTERNAL (decl
)
796 && !DECL_REGISTER (decl
)))
798 /* And that we were not given a type or a label. */
799 else if (TREE_CODE (decl
) == TYPE_DECL
800 || TREE_CODE (decl
) == LABEL_DECL
)
803 /* For a duplicate declaration, we can be called twice on the
804 same DECL node. Don't discard the RTL already made. */
805 if (DECL_RTL_SET_P (decl
))
807 /* If the old RTL had the wrong mode, fix the mode. */
808 if (GET_MODE (DECL_RTL (decl
)) != DECL_MODE (decl
))
809 SET_DECL_RTL (decl
, adjust_address_nv (DECL_RTL (decl
),
810 DECL_MODE (decl
), 0));
812 /* ??? Another way to do this would be to maintain a hashed
813 table of such critters. Instead of adding stuff to a DECL
814 to give certain attributes to it, we could use an external
815 hash map from DECL to set of attributes. */
817 /* Let the target reassign the RTL if it wants.
818 This is necessary, for example, when one machine specific
819 decl attribute overrides another. */
820 (* targetm
.encode_section_info
) (decl
, false);
824 new_name
= name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
826 reg_number
= decode_reg_name (asmspec
);
827 if (reg_number
== -2)
829 /* ASMSPEC is given, and not the name of a register. Mark the
830 name with a star so assemble_name won't munge it. */
831 char *starred
= alloca (strlen (asmspec
) + 2);
833 strcpy (starred
+ 1, asmspec
);
837 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
839 /* First detect errors in declaring global registers. */
840 if (reg_number
== -1)
841 error_with_decl (decl
, "register name not specified for `%s'");
842 else if (reg_number
< 0)
843 error_with_decl (decl
, "invalid register name for `%s'");
844 else if (TYPE_MODE (TREE_TYPE (decl
)) == BLKmode
)
845 error_with_decl (decl
,
846 "data type of `%s' isn't suitable for a register");
847 else if (! HARD_REGNO_MODE_OK (reg_number
, TYPE_MODE (TREE_TYPE (decl
))))
848 error_with_decl (decl
,
849 "register specified for `%s' isn't suitable for data type");
850 /* Now handle properly declared static register variables. */
855 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
857 DECL_INITIAL (decl
) = 0;
858 error ("global register variable has initial value");
860 if (TREE_THIS_VOLATILE (decl
))
861 warning ("volatile register variables don't work as you might wish");
863 /* If the user specified one of the eliminables registers here,
864 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
865 confused with that register and be eliminated. This usage is
866 somewhat suspect... */
868 SET_DECL_RTL (decl
, gen_rtx_raw_REG (DECL_MODE (decl
), reg_number
));
869 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
870 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
872 if (TREE_STATIC (decl
))
874 /* Make this register global, so not usable for anything
876 #ifdef ASM_DECLARE_REGISTER_GLOBAL
877 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
879 nregs
= HARD_REGNO_NREGS (reg_number
, DECL_MODE (decl
));
881 globalize_reg (reg_number
+ --nregs
);
884 /* As a register variable, it has no section. */
889 /* Now handle ordinary static variables and functions (in memory).
890 Also handle vars declared register invalidly. */
892 if (reg_number
>= 0 || reg_number
== -3)
893 error_with_decl (decl
,
894 "register name given for non-register variable `%s'");
896 /* Specifying a section attribute on a variable forces it into a
897 non-.bss section, and thus it cannot be common. */
898 if (TREE_CODE (decl
) == VAR_DECL
899 && DECL_SECTION_NAME (decl
) != NULL_TREE
900 && DECL_INITIAL (decl
) == NULL_TREE
901 && DECL_COMMON (decl
))
902 DECL_COMMON (decl
) = 0;
904 /* Variables can't be both common and weak. */
905 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
906 DECL_COMMON (decl
) = 0;
908 /* Can't use just the variable's own name for a variable
909 whose scope is less than the whole file, unless it's a member
910 of a local class (which will already be unambiguous).
911 Concatenate a distinguishing number. */
912 if (!top_level
&& !TREE_PUBLIC (decl
)
913 && ! (DECL_CONTEXT (decl
) && TYPE_P (DECL_CONTEXT (decl
)))
915 && name
== IDENTIFIER_POINTER (DECL_NAME (decl
)))
919 ASM_FORMAT_PRIVATE_NAME (label
, name
, var_labelno
);
924 if (name
!= new_name
)
926 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier (new_name
));
927 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
930 /* If this variable is to be treated as volatile, show its
931 tree node has side effects. */
932 if ((flag_volatile_global
&& TREE_CODE (decl
) == VAR_DECL
933 && TREE_PUBLIC (decl
))
934 || ((flag_volatile_static
&& TREE_CODE (decl
) == VAR_DECL
935 && (TREE_PUBLIC (decl
) || TREE_STATIC (decl
)))))
936 TREE_SIDE_EFFECTS (decl
) = 1;
938 x
= gen_rtx_MEM (DECL_MODE (decl
), gen_rtx_SYMBOL_REF (Pmode
, name
));
939 SYMBOL_REF_WEAK (XEXP (x
, 0)) = DECL_WEAK (decl
);
940 if (TREE_CODE (decl
) != FUNCTION_DECL
)
941 set_mem_attributes (x
, decl
, 1);
942 SET_DECL_RTL (decl
, x
);
944 /* Optionally set flags or add text to the name to record information
945 such as that it is a function name.
946 If the name is changed, the macro ASM_OUTPUT_LABELREF
947 will have to know how to strip this information. */
948 (* targetm
.encode_section_info
) (decl
, true);
951 /* Make the rtl for variable VAR be volatile.
952 Use this only for static variables. */
955 make_var_volatile (var
)
958 if (GET_CODE (DECL_RTL (var
)) != MEM
)
961 MEM_VOLATILE_P (DECL_RTL (var
)) = 1;
964 /* Output alignment directive to align for constant expression EXP. */
967 assemble_constant_align (exp
)
972 /* Align the location counter as required by EXP's data type. */
973 align
= TYPE_ALIGN (TREE_TYPE (exp
));
974 #ifdef CONSTANT_ALIGNMENT
975 align
= CONSTANT_ALIGNMENT (exp
, align
);
978 if (align
> BITS_PER_UNIT
)
980 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
984 /* Output a string of literal assembler code
985 for an `asm' keyword used between functions. */
988 assemble_asm (string
)
993 if (TREE_CODE (string
) == ADDR_EXPR
)
994 string
= TREE_OPERAND (string
, 0);
996 fprintf (asm_out_file
, "\t%s\n", TREE_STRING_POINTER (string
));
999 /* Record an element in the table of global destructors. SYMBOL is
1000 a SYMBOL_REF of the function to be called; PRIORITY is a number
1001 between 0 and MAX_INIT_PRIORITY. */
1004 default_stabs_asm_out_destructor (symbol
, priority
)
1006 int priority ATTRIBUTE_UNUSED
;
1008 /* Tell GNU LD that this is part of the static destructor set.
1009 This will work for any system that uses stabs, most usefully
1011 fprintf (asm_out_file
, "%s\"___DTOR_LIST__\",22,0,0,", ASM_STABS_OP
);
1012 assemble_name (asm_out_file
, XSTR (symbol
, 0));
1013 fputc ('\n', asm_out_file
);
1017 default_named_section_asm_out_destructor (symbol
, priority
)
1021 const char *section
= ".dtors";
1024 /* ??? This only works reliably with the GNU linker. */
1025 if (priority
!= DEFAULT_INIT_PRIORITY
)
1027 sprintf (buf
, ".dtors.%.5u",
1028 /* Invert the numbering so the linker puts us in the proper
1029 order; constructors are run from right to left, and the
1030 linker sorts in increasing order. */
1031 MAX_INIT_PRIORITY
- priority
);
1035 named_section_flags (section
, SECTION_WRITE
);
1036 assemble_align (POINTER_SIZE
);
1037 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1040 #ifdef DTORS_SECTION_ASM_OP
1044 if (in_section
!= in_dtors
)
1046 in_section
= in_dtors
;
1047 fputs (DTORS_SECTION_ASM_OP
, asm_out_file
);
1048 fputc ('\n', asm_out_file
);
1053 default_dtor_section_asm_out_destructor (symbol
, priority
)
1055 int priority ATTRIBUTE_UNUSED
;
1058 assemble_align (POINTER_SIZE
);
1059 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1063 /* Likewise for global constructors. */
1066 default_stabs_asm_out_constructor (symbol
, priority
)
1068 int priority ATTRIBUTE_UNUSED
;
1070 /* Tell GNU LD that this is part of the static destructor set.
1071 This will work for any system that uses stabs, most usefully
1073 fprintf (asm_out_file
, "%s\"___CTOR_LIST__\",22,0,0,", ASM_STABS_OP
);
1074 assemble_name (asm_out_file
, XSTR (symbol
, 0));
1075 fputc ('\n', asm_out_file
);
1079 default_named_section_asm_out_constructor (symbol
, priority
)
1083 const char *section
= ".ctors";
1086 /* ??? This only works reliably with the GNU linker. */
1087 if (priority
!= DEFAULT_INIT_PRIORITY
)
1089 sprintf (buf
, ".ctors.%.5u",
1090 /* Invert the numbering so the linker puts us in the proper
1091 order; constructors are run from right to left, and the
1092 linker sorts in increasing order. */
1093 MAX_INIT_PRIORITY
- priority
);
1097 named_section_flags (section
, SECTION_WRITE
);
1098 assemble_align (POINTER_SIZE
);
1099 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1102 #ifdef CTORS_SECTION_ASM_OP
1106 if (in_section
!= in_ctors
)
1108 in_section
= in_ctors
;
1109 fputs (CTORS_SECTION_ASM_OP
, asm_out_file
);
1110 fputc ('\n', asm_out_file
);
1115 default_ctor_section_asm_out_constructor (symbol
, priority
)
1117 int priority ATTRIBUTE_UNUSED
;
1120 assemble_align (POINTER_SIZE
);
1121 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1125 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1126 a nonzero value if the constant pool should be output before the
1127 start of the function, or a zero value if the pool should output
1128 after the end of the function. The default is to put it before the
1131 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1132 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1135 /* Output assembler code for the constant pool of a function and associated
1136 with defining the name of the function. DECL describes the function.
1137 NAME is the function's name. For the constant pool, we use the current
1138 constant pool data. */
1141 assemble_start_function (decl
, fnname
)
1147 /* The following code does not need preprocessing in the assembler. */
1151 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1152 output_constant_pool (fnname
, decl
);
1154 resolve_unique_section (decl
, 0, flag_function_sections
);
1155 function_section (decl
);
1157 /* Tell assembler to move to target machine's alignment for functions. */
1158 align
= floor_log2 (FUNCTION_BOUNDARY
/ BITS_PER_UNIT
);
1159 if (align
< force_align_functions_log
)
1160 align
= force_align_functions_log
;
1163 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1166 /* Handle a user-specified function alignment.
1167 Note that we still need to align to FUNCTION_BOUNDARY, as above,
1168 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1169 if (align_functions_log
> align
1170 && cfun
->function_frequency
!= FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
)
1172 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1173 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1174 align_functions_log
, align_functions
- 1);
1176 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1180 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1181 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1184 (*debug_hooks
->begin_function
) (decl
);
1186 /* Make function name accessible from other files, if appropriate. */
1188 if (TREE_PUBLIC (decl
))
1190 if (! first_global_object_name
)
1195 p
= (* targetm
.strip_name_encoding
) (fnname
);
1198 if (! DECL_WEAK (decl
) && ! DECL_ONE_ONLY (decl
))
1199 first_global_object_name
= name
;
1201 weak_global_object_name
= name
;
1204 globalize_decl (decl
);
1206 maybe_assemble_visibility (decl
);
1209 /* Do any machine/system dependent processing of the function name */
1210 #ifdef ASM_DECLARE_FUNCTION_NAME
1211 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1213 /* Standard thing is just output label for the function. */
1214 ASM_OUTPUT_LABEL (asm_out_file
, fnname
);
1215 #endif /* ASM_DECLARE_FUNCTION_NAME */
1218 /* Output assembler code associated with defining the size of the
1219 function. DECL describes the function. NAME is the function's name. */
1222 assemble_end_function (decl
, fnname
)
1226 #ifdef ASM_DECLARE_FUNCTION_SIZE
1227 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1229 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1231 output_constant_pool (fnname
, decl
);
1232 function_section (decl
); /* need to switch back */
1235 /* Output any constants which should appear after the function. */
1236 output_after_function_constants ();
1239 /* Assemble code to leave SIZE bytes of zeros. */
1242 assemble_zeros (size
)
1245 /* Do no output if -fsyntax-only. */
1246 if (flag_syntax_only
)
1249 #ifdef ASM_NO_SKIP_IN_TEXT
1250 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1251 so we must output 0s explicitly in the text section. */
1252 if (ASM_NO_SKIP_IN_TEXT
&& in_text_section ())
1255 for (i
= 0; i
< size
; i
++)
1256 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1261 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1264 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1267 assemble_align (align
)
1270 if (align
> BITS_PER_UNIT
)
1272 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1276 /* Assemble a string constant with the specified C string as contents. */
1279 assemble_string (p
, size
)
1286 /* If the string is very long, split it up. */
1290 int thissize
= size
- pos
;
1291 if (thissize
> maximum
)
1294 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1302 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1303 #define ASM_EMIT_LOCAL(decl, name, size, rounded) \
1304 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name, size, DECL_ALIGN (decl))
1306 #if defined ASM_OUTPUT_ALIGNED_LOCAL
1307 #define ASM_EMIT_LOCAL(decl, name, size, rounded) \
1308 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, DECL_ALIGN (decl))
1310 #define ASM_EMIT_LOCAL(decl, name, size, rounded) \
1311 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded)
1315 #if defined ASM_OUTPUT_ALIGNED_BSS
1316 #define ASM_EMIT_BSS(decl, name, size, rounded) \
1317 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size, DECL_ALIGN (decl))
1319 #if defined ASM_OUTPUT_BSS
1320 #define ASM_EMIT_BSS(decl, name, size, rounded) \
1321 ASM_OUTPUT_BSS (asm_out_file, decl, name, size, rounded)
1327 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1328 #define ASM_EMIT_COMMON(decl, name, size, rounded) \
1329 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name, size, DECL_ALIGN (decl))
1331 #if defined ASM_OUTPUT_ALIGNED_COMMON
1332 #define ASM_EMIT_COMMON(decl, name, size, rounded) \
1333 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, DECL_ALIGN (decl))
1335 #define ASM_EMIT_COMMON(decl, name, size, rounded) \
1336 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded)
1341 asm_emit_uninitialised (decl
, name
, size
, rounded
)
1344 int size ATTRIBUTE_UNUSED
;
1345 int rounded ATTRIBUTE_UNUSED
;
1353 destination
= asm_dest_local
;
1355 /* ??? We should handle .bss via select_section mechanisms rather than
1356 via special target hooks. That would eliminate this special case. */
1357 if (TREE_PUBLIC (decl
))
1359 if (!DECL_COMMON (decl
))
1361 destination
= asm_dest_bss
;
1366 destination
= asm_dest_common
;
1369 if (destination
== asm_dest_bss
)
1370 globalize_decl (decl
);
1371 resolve_unique_section (decl
, 0, flag_data_sections
);
1373 if (flag_shared_data
)
1375 switch (destination
)
1377 #ifdef ASM_OUTPUT_SHARED_BSS
1379 ASM_OUTPUT_SHARED_BSS (asm_out_file
, decl
, name
, size
, rounded
);
1382 #ifdef ASM_OUTPUT_SHARED_COMMON
1383 case asm_dest_common
:
1384 ASM_OUTPUT_SHARED_COMMON (asm_out_file
, name
, size
, rounded
);
1387 #ifdef ASM_OUTPUT_SHARED_LOCAL
1388 case asm_dest_local
:
1389 ASM_OUTPUT_SHARED_LOCAL (asm_out_file
, name
, size
, rounded
);
1397 switch (destination
)
1401 ASM_EMIT_BSS (decl
, name
, size
, rounded
);
1404 case asm_dest_common
:
1405 ASM_EMIT_COMMON (decl
, name
, size
, rounded
);
1407 case asm_dest_local
:
1408 ASM_EMIT_LOCAL (decl
, name
, size
, rounded
);
1417 /* Assemble everything that is needed for a variable or function declaration.
1418 Not used for automatic variables, and not used for function definitions.
1419 Should not be called for variables of incomplete structure type.
1421 TOP_LEVEL is nonzero if this variable has file scope.
1422 AT_END is nonzero if this is the special handling, at end of compilation,
1423 to define things that have had only tentative definitions.
1424 DONT_OUTPUT_DATA if nonzero means don't actually output the
1425 initial value (that will be done by the caller). */
1428 assemble_variable (decl
, top_level
, at_end
, dont_output_data
)
1430 int top_level ATTRIBUTE_UNUSED
;
1431 int at_end ATTRIBUTE_UNUSED
;
1432 int dont_output_data
;
1439 last_assemble_variable_decl
= 0;
1441 /* Normally no need to say anything here for external references,
1442 since assemble_external is called by the language-specific code
1443 when a declaration is first seen. */
1445 if (DECL_EXTERNAL (decl
))
1448 /* Output no assembler code for a function declaration.
1449 Only definitions of functions output anything. */
1451 if (TREE_CODE (decl
) == FUNCTION_DECL
)
1454 /* Do nothing for global register variables. */
1455 if (DECL_RTL_SET_P (decl
) && GET_CODE (DECL_RTL (decl
)) == REG
)
1457 TREE_ASM_WRITTEN (decl
) = 1;
1461 /* If type was incomplete when the variable was declared,
1462 see if it is complete now. */
1464 if (DECL_SIZE (decl
) == 0)
1465 layout_decl (decl
, 0);
1467 /* Still incomplete => don't allocate it; treat the tentative defn
1468 (which is what it must have been) as an `extern' reference. */
1470 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
1472 error_with_file_and_line (DECL_SOURCE_FILE (decl
),
1473 DECL_SOURCE_LINE (decl
),
1474 "storage size of `%s' isn't known",
1475 IDENTIFIER_POINTER (DECL_NAME (decl
)));
1476 TREE_ASM_WRITTEN (decl
) = 1;
1480 /* The first declaration of a variable that comes through this function
1481 decides whether it is global (in C, has external linkage)
1482 or local (in C, has internal linkage). So do nothing more
1483 if this function has already run. */
1485 if (TREE_ASM_WRITTEN (decl
))
1488 /* Make sure targetm.encode_section_info is invoked before we set
1490 decl_rtl
= DECL_RTL (decl
);
1492 TREE_ASM_WRITTEN (decl
) = 1;
1494 /* Do no output if -fsyntax-only. */
1495 if (flag_syntax_only
)
1500 if (! dont_output_data
1501 && ! host_integerp (DECL_SIZE_UNIT (decl
), 1))
1503 error_with_decl (decl
, "size of variable `%s' is too large");
1507 name
= XSTR (XEXP (decl_rtl
, 0), 0);
1508 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
)
1509 && ! first_global_object_name
1510 && ! (DECL_COMMON (decl
) && (DECL_INITIAL (decl
) == 0
1511 || DECL_INITIAL (decl
) == error_mark_node
))
1512 && ! DECL_WEAK (decl
)
1513 && ! DECL_ONE_ONLY (decl
))
1518 p
= (* targetm
.strip_name_encoding
) (name
);
1519 xname
= xstrdup (p
);
1520 first_global_object_name
= xname
;
1523 /* Compute the alignment of this data. */
1525 align
= DECL_ALIGN (decl
);
1527 /* In the case for initialing an array whose length isn't specified,
1528 where we have not yet been able to do the layout,
1529 figure out the proper alignment now. */
1530 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1531 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1532 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1534 /* Some object file formats have a maximum alignment which they support.
1535 In particular, a.out format supports a maximum alignment of 4. */
1536 #ifndef MAX_OFILE_ALIGNMENT
1537 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
1539 if (align
> MAX_OFILE_ALIGNMENT
)
1541 warning_with_decl (decl
,
1542 "alignment of `%s' is greater than maximum object file alignment. Using %d",
1543 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1544 align
= MAX_OFILE_ALIGNMENT
;
1547 /* On some machines, it is good to increase alignment sometimes. */
1548 if (! DECL_USER_ALIGN (decl
))
1550 #ifdef DATA_ALIGNMENT
1551 align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1553 #ifdef CONSTANT_ALIGNMENT
1554 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
1555 align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1559 /* Reset the alignment in case we have made it tighter, so we can benefit
1560 from it in get_pointer_alignment. */
1561 DECL_ALIGN (decl
) = align
;
1562 set_mem_align (decl_rtl
, align
);
1564 if (TREE_PUBLIC (decl
))
1565 maybe_assemble_visibility (decl
);
1567 /* Output any data that we will need to use the address of. */
1568 if (DECL_INITIAL (decl
) == error_mark_node
)
1569 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1570 else if (DECL_INITIAL (decl
))
1571 reloc
= output_addressed_constants (DECL_INITIAL (decl
));
1572 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1574 /* Handle uninitialized definitions. */
1576 /* If the decl has been given an explicit section name, then it
1577 isn't common, and shouldn't be handled as such. */
1578 if (DECL_SECTION_NAME (decl
) || dont_output_data
)
1580 /* We don't implement common thread-local data at present. */
1581 else if (DECL_THREAD_LOCAL (decl
))
1583 if (DECL_COMMON (decl
))
1584 sorry ("thread-local COMMON data not implemented");
1586 else if (DECL_INITIAL (decl
) == 0
1587 || DECL_INITIAL (decl
) == error_mark_node
1588 || (flag_zero_initialized_in_bss
1589 && initializer_zerop (DECL_INITIAL (decl
))))
1591 unsigned HOST_WIDE_INT size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1592 unsigned HOST_WIDE_INT rounded
= size
;
1594 /* Don't allocate zero bytes of common,
1595 since that means "undefined external" in the linker. */
1599 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1600 so that each uninitialized object starts on such a boundary. */
1601 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1602 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1603 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1605 #if !defined(ASM_OUTPUT_ALIGNED_COMMON) && !defined(ASM_OUTPUT_ALIGNED_DECL_COMMON) && !defined(ASM_OUTPUT_ALIGNED_BSS)
1606 if ((unsigned HOST_WIDE_INT
) DECL_ALIGN (decl
) / BITS_PER_UNIT
> rounded
)
1608 (decl
, "requested alignment for %s is greater than implemented alignment of %d",rounded
);
1611 /* If the target cannot output uninitialized but not common global data
1612 in .bss, then we have to use .data, so fall through. */
1613 if (asm_emit_uninitialised (decl
, name
, size
, rounded
))
1617 /* Handle initialized definitions.
1618 Also handle uninitialized global definitions if -fno-common and the
1619 target doesn't support ASM_OUTPUT_BSS. */
1621 /* First make the assembler name(s) global if appropriate. */
1622 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
1623 globalize_decl (decl
);
1625 /* Switch to the appropriate section. */
1626 variable_section (decl
, reloc
);
1628 /* dbxout.c needs to know this. */
1629 if (in_text_section ())
1630 DECL_IN_TEXT_SECTION (decl
) = 1;
1632 /* Output the alignment of this data. */
1633 if (align
> BITS_PER_UNIT
)
1635 ASM_OUTPUT_ALIGN (asm_out_file
,
1636 floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
));
1639 /* Do any machine/system dependent processing of the object. */
1640 #ifdef ASM_DECLARE_OBJECT_NAME
1641 last_assemble_variable_decl
= decl
;
1642 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1644 /* Standard thing is just output label for the object. */
1645 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1646 #endif /* ASM_DECLARE_OBJECT_NAME */
1648 if (!dont_output_data
)
1650 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
1651 /* Output the actual data. */
1652 output_constant (DECL_INITIAL (decl
),
1653 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1656 /* Leave space for it. */
1657 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1661 /* Return 1 if type TYPE contains any pointers. */
1664 contains_pointers_p (type
)
1667 switch (TREE_CODE (type
))
1670 case REFERENCE_TYPE
:
1671 /* I'm not sure whether OFFSET_TYPE needs this treatment,
1672 so I'll play safe and return 1. */
1678 case QUAL_UNION_TYPE
:
1681 /* For a type that has fields, see if the fields have pointers. */
1682 for (fields
= TYPE_FIELDS (type
); fields
; fields
= TREE_CHAIN (fields
))
1683 if (TREE_CODE (fields
) == FIELD_DECL
1684 && contains_pointers_p (TREE_TYPE (fields
)))
1690 /* An array type contains pointers if its element type does. */
1691 return contains_pointers_p (TREE_TYPE (type
));
1698 /* Output something to declare an external symbol to the assembler.
1699 (Most assemblers don't need this, so we normally output nothing.)
1700 Do nothing if DECL is not external. */
1703 assemble_external (decl
)
1704 tree decl ATTRIBUTE_UNUSED
;
1706 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
1707 main body of this code is only rarely exercised. To provide some
1708 testing, on all platforms, we make sure that the ASM_OUT_FILE is
1709 open. If it's not, we should not be calling this function. */
1713 #ifdef ASM_OUTPUT_EXTERNAL
1714 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
1716 rtx rtl
= DECL_RTL (decl
);
1718 if (GET_CODE (rtl
) == MEM
&& GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
1719 && ! SYMBOL_REF_USED (XEXP (rtl
, 0)))
1721 /* Some systems do require some output. */
1722 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
1723 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
1729 /* Similar, for calling a library function FUN. */
1732 assemble_external_libcall (fun
)
1733 rtx fun ATTRIBUTE_UNUSED
;
1735 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
1736 /* Declare library function name external when first used, if nec. */
1737 if (! SYMBOL_REF_USED (fun
))
1739 SYMBOL_REF_USED (fun
) = 1;
1740 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file
, fun
);
1745 /* Assemble a label named NAME. */
1748 assemble_label (name
)
1751 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1754 /* Output to FILE a reference to the assembler name of a C-level name NAME.
1755 If NAME starts with a *, the rest of NAME is output verbatim.
1756 Otherwise NAME is transformed in an implementation-defined way
1757 (usually by the addition of an underscore).
1758 Many macros in the tm file are defined to call this function. */
1761 assemble_name (file
, name
)
1765 const char *real_name
;
1768 real_name
= (* targetm
.strip_name_encoding
) (name
);
1770 id
= maybe_get_identifier (real_name
);
1772 TREE_SYMBOL_REFERENCED (id
) = 1;
1775 fputs (&name
[1], file
);
1777 ASM_OUTPUT_LABELREF (file
, name
);
1780 /* Allocate SIZE bytes writable static space with a gensym name
1781 and return an RTX to refer to its address. */
1784 assemble_static_space (size
)
1788 const char *namestring
;
1792 if (flag_shared_data
)
1796 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
1798 namestring
= ggc_strdup (name
);
1800 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
1802 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
1803 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
1806 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
1807 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
1810 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1811 so that each uninitialized object starts on such a boundary. */
1812 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
1813 int rounded ATTRIBUTE_UNUSED
1814 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
1815 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1816 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1817 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1824 /* Assemble the static constant template for function entry trampolines.
1825 This is done at most once per compilation.
1826 Returns an RTX for the address of the template. */
1828 #ifdef TRAMPOLINE_TEMPLATE
1830 assemble_trampoline_template ()
1836 /* By default, put trampoline templates in read-only data section. */
1838 #ifdef TRAMPOLINE_SECTION
1839 TRAMPOLINE_SECTION ();
1841 readonly_data_section ();
1844 /* Write the assembler code to define one. */
1845 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
1848 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1851 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file
, "LTRAMP", 0);
1852 TRAMPOLINE_TEMPLATE (asm_out_file
);
1854 /* Record the rtl to refer to it. */
1855 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
1856 name
= ggc_strdup (label
);
1857 return gen_rtx_SYMBOL_REF (Pmode
, name
);
1861 /* A and B are either alignments or offsets. Return the minimum alignment
1862 that may be assumed after adding the two together. */
1864 static inline unsigned
1868 return (a
| b
) & -(a
| b
);
1871 /* Return the assembler directive for creating a given kind of integer
1872 object. SIZE is the number of bytes in the object and ALIGNED_P
1873 indicates whether it is known to be aligned. Return NULL if the
1874 assembly dialect has no such directive.
1876 The returned string should be printed at the start of a new line and
1877 be followed immediately by the object's initial value. */
1880 integer_asm_op (size
, aligned_p
)
1884 struct asm_int_op
*ops
;
1887 ops
= &targetm
.asm_out
.aligned_op
;
1889 ops
= &targetm
.asm_out
.unaligned_op
;
1894 return targetm
.asm_out
.byte_op
;
1908 /* Use directive OP to assemble an integer object X. Print OP at the
1909 start of the line, followed immediately by the value of X. */
1912 assemble_integer_with_op (op
, x
)
1916 fputs (op
, asm_out_file
);
1917 output_addr_const (asm_out_file
, x
);
1918 fputc ('\n', asm_out_file
);
1921 /* The default implementation of the asm_out.integer target hook. */
1924 default_assemble_integer (x
, size
, aligned_p
)
1925 rtx x ATTRIBUTE_UNUSED
;
1926 unsigned int size ATTRIBUTE_UNUSED
;
1927 int aligned_p ATTRIBUTE_UNUSED
;
1929 const char *op
= integer_asm_op (size
, aligned_p
);
1930 return op
&& (assemble_integer_with_op (op
, x
), true);
1933 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
1934 the alignment of the integer in bits. Return 1 if we were able to output
1935 the constant, otherwise 0. If FORCE is nonzero, abort if we can't output
1939 assemble_integer (x
, size
, align
, force
)
1947 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
1949 /* See if the target hook can handle this kind of object. */
1950 if ((*targetm
.asm_out
.integer
) (x
, size
, aligned_p
))
1953 /* If the object is a multi-byte one, try splitting it up. Split
1954 it into words it if is multi-word, otherwise split it into bytes. */
1957 enum machine_mode omode
, imode
;
1958 unsigned int subalign
;
1959 unsigned int subsize
, i
;
1961 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
1962 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
1963 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, MODE_INT
, 0);
1964 imode
= mode_for_size (size
* BITS_PER_UNIT
, MODE_INT
, 0);
1966 for (i
= 0; i
< size
; i
+= subsize
)
1968 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
1969 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
1975 /* If we've printed some of it, but not all of it, there's no going
1988 assemble_real (d
, mode
, align
)
1990 enum machine_mode mode
;
1995 unsigned int nalign
= min_align (align
, 32);
1997 switch (BITS_PER_UNIT
)
2003 REAL_VALUE_TO_TARGET_SINGLE (d
, l
);
2004 assemble_integer (GEN_INT (l
), 4, align
, 1);
2007 REAL_VALUE_TO_TARGET_DOUBLE (d
, data
);
2008 assemble_integer (GEN_INT (data
[0]), 4, align
, 1);
2009 assemble_integer (GEN_INT (data
[1]), 4, nalign
, 1);
2012 REAL_VALUE_TO_TARGET_LONG_DOUBLE (d
, data
);
2013 assemble_integer (GEN_INT (data
[0]), 4, align
, 1);
2014 assemble_integer (GEN_INT (data
[1]), 4, nalign
, 1);
2015 assemble_integer (GEN_INT (data
[2]), 4, nalign
, 1);
2018 REAL_VALUE_TO_TARGET_LONG_DOUBLE (d
, data
);
2019 assemble_integer (GEN_INT (data
[0]), 4, align
, 1);
2020 assemble_integer (GEN_INT (data
[1]), 4, nalign
, 1);
2021 assemble_integer (GEN_INT (data
[2]), 4, nalign
, 1);
2022 assemble_integer (GEN_INT (data
[3]), 4, nalign
, 1);
2033 REAL_VALUE_TO_TARGET_SINGLE (d
, l
);
2034 assemble_integer (GEN_INT (l
), 2, align
, 1);
2037 REAL_VALUE_TO_TARGET_DOUBLE (d
, data
);
2038 assemble_integer (GEN_INT (data
[0]), 2, align
, 1);
2039 assemble_integer (GEN_INT (data
[1]), 1, nalign
, 1);
2050 REAL_VALUE_TO_TARGET_SINGLE (d
, l
);
2051 assemble_integer (GEN_INT (l
), 1, align
, 1);
2054 REAL_VALUE_TO_TARGET_DOUBLE (d
, data
);
2055 assemble_integer (GEN_INT (data
[0]), 1, align
, 1);
2056 assemble_integer (GEN_INT (data
[1]), 1, nalign
, 1);
2068 /* Given an expression EXP with a constant value,
2069 reduce it to the sum of an assembler symbol and an integer.
2070 Store them both in the structure *VALUE.
2071 Abort if EXP does not reduce. */
2073 struct addr_const
GTY(())
2076 HOST_WIDE_INT offset
;
2080 decode_addr_const (exp
, value
)
2082 struct addr_const
*value
;
2084 tree target
= TREE_OPERAND (exp
, 0);
2090 if (TREE_CODE (target
) == COMPONENT_REF
2091 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2094 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2095 target
= TREE_OPERAND (target
, 0);
2097 else if (TREE_CODE (target
) == ARRAY_REF
2098 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2100 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2101 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2102 target
= TREE_OPERAND (target
, 0);
2108 switch (TREE_CODE (target
))
2112 x
= DECL_RTL (target
);
2116 x
= gen_rtx_MEM (FUNCTION_MODE
,
2117 gen_rtx_LABEL_REF (VOIDmode
,
2118 label_rtx (TREE_OPERAND (exp
, 0))));
2126 /* This constant should have been output already, but we can't simply
2127 use TREE_CST_RTL since INTEGER_CST doesn't have one. */
2128 x
= output_constant_def (target
, 1);
2135 if (GET_CODE (x
) != MEM
)
2140 value
->offset
= offset
;
2143 /* We do RTX_UNSPEC + XINT (blah), so nothing can go after RTX_UNSPEC. */
2144 enum kind
{ RTX_UNKNOWN
, RTX_DOUBLE
, RTX_VECTOR
, RTX_INT
, RTX_UNSPEC
};
2145 struct rtx_const
GTY(())
2147 ENUM_BITFIELD(kind
) kind
: 16;
2148 ENUM_BITFIELD(machine_mode
) mode
: 16;
2149 union rtx_const_un
{
2151 struct addr_const
GTY ((tag ("1"))) addr
;
2152 struct rtx_const_u_di
{
2155 } GTY ((tag ("0"))) di
;
2157 /* The max vector size we have is 16 wide; two variants for
2158 integral and floating point vectors. */
2159 struct rtx_const_int_vec
{
2162 } GTY ((tag ("2"))) int_vec
[16];
2164 REAL_VALUE_TYPE
GTY ((tag ("3"))) fp_vec
[8];
2166 } GTY ((desc ("%1.kind >= RTX_INT"), descbits ("1"))) un
;
2169 /* Uniquize all constants that appear in memory.
2170 Each constant in memory thus far output is recorded
2171 in `const_hash_table'. */
2173 struct constant_descriptor_tree
GTY(())
2175 /* More constant_descriptors with the same hash code. */
2176 struct constant_descriptor_tree
*next
;
2178 /* The label of the constant. */
2181 /* A MEM for the constant. */
2184 /* The value of the constant. */
2188 #define MAX_HASH_TABLE 1009
2189 static GTY(()) struct constant_descriptor_tree
*
2190 const_hash_table
[MAX_HASH_TABLE
];
2192 /* We maintain a hash table of STRING_CST values. Unless we are asked to force
2193 out a string constant, we defer output of the constants until we know
2194 they are actually used. This will be if something takes its address or if
2195 there is a usage of the string in the RTL of a function. */
2197 #define STRHASH(x) htab_hash_pointer (x)
2199 struct deferred_string
GTY(())
2206 static GTY ((param_is (struct deferred_string
))) htab_t const_str_htab
;
2208 /* Returns a hash code for X (which is a really a
2209 struct deferred_string *). */
2212 const_str_htab_hash (x
)
2215 return STRHASH (((const struct deferred_string
*) x
)->label
);
2218 /* Returns nonzero if the value represented by X (which is really a
2219 struct deferred_string *) is the same as that given by Y
2220 (which is really a char *). */
2223 const_str_htab_eq (x
, y
)
2227 return (((const struct deferred_string
*) x
)->label
== (const char *) y
);
2230 /* Compute a hash code for a constant expression. */
2236 return const_hash_1 (exp
) % MAX_HASH_TABLE
;
2246 enum tree_code code
= TREE_CODE (exp
);
2248 /* Either set P and LEN to the address and len of something to hash and
2249 exit the switch or return a value. */
2254 p
= (char *) &TREE_INT_CST (exp
);
2255 len
= sizeof TREE_INT_CST (exp
);
2259 return real_hash (TREE_REAL_CST_PTR (exp
));
2262 p
= TREE_STRING_POINTER (exp
);
2263 len
= TREE_STRING_LENGTH (exp
);
2267 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2268 + const_hash_1 (TREE_IMAGPART (exp
)));
2271 if (TREE_CODE (TREE_TYPE (exp
)) == SET_TYPE
)
2275 len
= int_size_in_bytes (TREE_TYPE (exp
));
2276 tmp
= (char *) alloca (len
);
2277 get_set_constructor_bytes (exp
, (unsigned char *) tmp
, len
);
2285 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2287 for (link
= CONSTRUCTOR_ELTS (exp
); link
; link
= TREE_CHAIN (link
))
2288 if (TREE_VALUE (link
))
2289 hi
= hi
* 603 + const_hash_1 (TREE_VALUE (link
));
2297 struct addr_const value
;
2299 decode_addr_const (exp
, &value
);
2300 if (GET_CODE (value
.base
) == SYMBOL_REF
)
2302 /* Don't hash the address of the SYMBOL_REF;
2303 only use the offset and the symbol name. */
2305 p
= XSTR (value
.base
, 0);
2306 for (i
= 0; p
[i
] != 0; i
++)
2307 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2309 else if (GET_CODE (value
.base
) == LABEL_REF
)
2310 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2318 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2319 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2323 case NON_LVALUE_EXPR
:
2324 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2327 /* A language specific constant. Just hash the code. */
2331 /* Compute hashing function */
2333 for (i
= 0; i
< len
; i
++)
2334 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2339 /* Compare t1 and t2, and return 1 only if they are known to result in
2340 the same bit pattern on output. */
2343 compare_constant (t1
, t2
)
2347 enum tree_code typecode
;
2349 if (t1
== NULL_TREE
)
2350 return t2
== NULL_TREE
;
2351 if (t2
== NULL_TREE
)
2354 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2357 switch (TREE_CODE (t1
))
2360 /* Integer constants are the same only if the same width of type. */
2361 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2363 return tree_int_cst_equal (t1
, t2
);
2366 /* Real constants are the same only if the same width of type. */
2367 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2370 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2373 if (flag_writable_strings
)
2376 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2379 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2380 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2381 TREE_STRING_LENGTH (t1
)));
2384 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2385 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2388 typecode
= TREE_CODE (TREE_TYPE (t1
));
2389 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2392 if (typecode
== SET_TYPE
)
2394 int len
= int_size_in_bytes (TREE_TYPE (t2
));
2395 unsigned char *tmp1
, *tmp2
;
2397 if (int_size_in_bytes (TREE_TYPE (t1
)) != len
)
2400 tmp1
= (unsigned char *) alloca (len
);
2401 tmp2
= (unsigned char *) alloca (len
);
2403 if (get_set_constructor_bytes (t1
, tmp1
, len
) != NULL_TREE
)
2405 if (get_set_constructor_bytes (t2
, tmp2
, len
) != NULL_TREE
)
2408 return memcmp (tmp1
, tmp2
, len
) != 0;
2414 if (typecode
== ARRAY_TYPE
)
2416 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2417 /* For arrays, check that the sizes all match. */
2418 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2420 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2425 /* For record and union constructors, require exact type
2427 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2431 for (l1
= CONSTRUCTOR_ELTS (t1
), l2
= CONSTRUCTOR_ELTS (t2
);
2433 l1
= TREE_CHAIN (l1
), l2
= TREE_CHAIN (l2
))
2435 /* Check that each value is the same... */
2436 if (! compare_constant (TREE_VALUE (l1
), TREE_VALUE (l2
)))
2438 /* ... and that they apply to the same fields! */
2439 if (typecode
== ARRAY_TYPE
)
2441 if (! compare_constant (TREE_PURPOSE (l1
),
2447 if (TREE_PURPOSE (l1
) != TREE_PURPOSE (l2
))
2452 return l1
== NULL_TREE
&& l2
== NULL_TREE
;
2458 struct addr_const value1
, value2
;
2460 decode_addr_const (t1
, &value1
);
2461 decode_addr_const (t2
, &value2
);
2462 return (value1
.offset
== value2
.offset
2463 && strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
2469 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
2470 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
2474 case NON_LVALUE_EXPR
:
2475 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
2480 nt1
= (*lang_hooks
.expand_constant
) (t1
);
2481 nt2
= (*lang_hooks
.expand_constant
) (t2
);
2482 if (nt1
!= t1
|| nt2
!= t2
)
2483 return compare_constant (nt1
, nt2
);
2489 /* Should not get here. */
2493 /* Record a list of constant expressions that were passed to
2494 output_constant_def but that could not be output right away. */
2496 struct deferred_constant
2498 struct deferred_constant
*next
;
2504 static struct deferred_constant
*deferred_constants
;
2506 /* Another list of constants which should be output after the
2508 static struct deferred_constant
*after_function_constants
;
2510 /* Nonzero means defer output of addressed subconstants
2511 (i.e., those for which output_constant_def is called.) */
2512 static int defer_addressed_constants_flag
;
2514 /* Start deferring output of subconstants. */
2517 defer_addressed_constants ()
2519 defer_addressed_constants_flag
++;
2522 /* Stop deferring output of subconstants,
2523 and output now all those that have been deferred. */
2526 output_deferred_addressed_constants ()
2528 struct deferred_constant
*p
, *next
;
2530 defer_addressed_constants_flag
--;
2532 if (defer_addressed_constants_flag
> 0)
2535 for (p
= deferred_constants
; p
; p
= next
)
2537 output_constant_def_contents (p
->exp
, p
->reloc
, p
->labelno
);
2542 deferred_constants
= 0;
2545 /* Output any constants which should appear after a function. */
2548 output_after_function_constants ()
2550 struct deferred_constant
*p
, *next
;
2552 for (p
= after_function_constants
; p
; p
= next
)
2554 output_constant_def_contents (p
->exp
, p
->reloc
, p
->labelno
);
2559 after_function_constants
= 0;
2562 /* Make a copy of the whole tree structure for a constant. This
2563 handles the same types of nodes that compare_constant handles. */
2569 switch (TREE_CODE (exp
))
2572 /* For ADDR_EXPR, we do not want to copy the decl whose address
2573 is requested. We do want to copy constants though. */
2574 if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp
, 0))) == 'c')
2575 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
2576 copy_constant (TREE_OPERAND (exp
, 0)));
2578 return copy_node (exp
);
2583 return copy_node (exp
);
2586 return build_complex (TREE_TYPE (exp
),
2587 copy_constant (TREE_REALPART (exp
)),
2588 copy_constant (TREE_IMAGPART (exp
)));
2592 return build (TREE_CODE (exp
), TREE_TYPE (exp
),
2593 copy_constant (TREE_OPERAND (exp
, 0)),
2594 copy_constant (TREE_OPERAND (exp
, 1)));
2598 case NON_LVALUE_EXPR
:
2599 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
2600 copy_constant (TREE_OPERAND (exp
, 0)));
2604 tree copy
= copy_node (exp
);
2605 tree list
= copy_list (CONSTRUCTOR_ELTS (exp
));
2608 CONSTRUCTOR_ELTS (copy
) = list
;
2609 for (tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
2610 TREE_VALUE (tail
) = copy_constant (TREE_VALUE (tail
));
2611 if (TREE_CODE (TREE_TYPE (exp
)) == SET_TYPE
)
2612 for (tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
2613 TREE_PURPOSE (tail
) = copy_constant (TREE_PURPOSE (tail
));
2621 t
= (*lang_hooks
.expand_constant
) (exp
);
2623 return copy_constant (t
);
2630 /* Return an rtx representing a reference to constant data in memory
2631 for the constant expression EXP.
2633 If assembler code for such a constant has already been output,
2634 return an rtx to refer to it.
2635 Otherwise, output such a constant in memory (or defer it for later)
2636 and generate an rtx for it.
2638 If DEFER is nonzero, the output of string constants can be deferred
2639 and output only if referenced in the function after all optimizations.
2641 The TREE_CST_RTL of EXP is set up to point to that rtx.
2642 The const_hash_table records which constants already have label strings. */
2645 output_constant_def (exp
, defer
)
2650 struct constant_descriptor_tree
*desc
;
2651 struct deferred_string
**defstr
;
2655 int after_function
= 0;
2659 /* We can't just use the saved RTL if this is a deferred string constant
2660 and we are not to defer anymore. */
2661 if (TREE_CODE (exp
) != INTEGER_CST
&& TREE_CST_RTL (exp
)
2662 && (defer
|| !STRING_POOL_ADDRESS_P (XEXP (TREE_CST_RTL (exp
), 0))))
2663 return TREE_CST_RTL (exp
);
2665 /* Make sure any other constants whose addresses appear in EXP
2666 are assigned label numbers. */
2668 reloc
= output_addressed_constants (exp
);
2670 /* Compute hash code of EXP. Search the descriptors for that hash code
2671 to see if any of them describes EXP. If yes, the descriptor records
2672 the label number already assigned. */
2674 hash
= const_hash (exp
);
2676 for (desc
= const_hash_table
[hash
]; desc
; desc
= desc
->next
)
2677 if (compare_constant (exp
, desc
->value
))
2682 /* No constant equal to EXP is known to have been output.
2683 Make a constant descriptor to enter EXP in the hash table.
2684 Assign the label number and record it in the descriptor for
2685 future calls to this function to find. */
2687 /* Create a string containing the label name, in LABEL. */
2688 labelno
= const_labelno
++;
2689 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
2691 desc
= ggc_alloc (sizeof (*desc
));
2692 desc
->next
= const_hash_table
[hash
];
2693 desc
->label
= ggc_strdup (label
);
2694 desc
->value
= copy_constant (exp
);
2695 const_hash_table
[hash
] = desc
;
2697 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
2699 = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp
)),
2700 gen_rtx_SYMBOL_REF (Pmode
, desc
->label
));
2702 set_mem_attributes (rtl
, exp
, 1);
2703 set_mem_alias_set (rtl
, 0);
2704 set_mem_alias_set (rtl
, const_alias_set
);
2711 if (TREE_CODE (exp
) != INTEGER_CST
)
2712 TREE_CST_RTL (exp
) = rtl
;
2714 /* Optionally set flags or add text to the name to record information
2715 such as that it is a function name. If the name is changed, the macro
2716 ASM_OUTPUT_LABELREF will have to know how to strip this information. */
2717 /* A previously-processed constant would already have section info
2721 /* Take care not to invoke targetm.encode_section_info for
2722 constants which don't have a TREE_CST_RTL. */
2723 if (TREE_CODE (exp
) != INTEGER_CST
)
2724 (*targetm
.encode_section_info
) (exp
, true);
2727 desc
->label
= XSTR (XEXP (desc
->rtl
, 0), 0);
2730 #ifdef CONSTANT_AFTER_FUNCTION_P
2731 if (current_function_decl
!= 0
2732 && CONSTANT_AFTER_FUNCTION_P (exp
))
2737 && STRING_POOL_ADDRESS_P (XEXP (rtl
, 0))
2738 && (!defer
|| defer_addressed_constants_flag
|| after_function
))
2740 defstr
= (struct deferred_string
**)
2741 htab_find_slot_with_hash (const_str_htab
, desc
->label
,
2742 STRHASH (desc
->label
), NO_INSERT
);
2745 /* If the string is currently deferred but we need to output it now,
2746 remove it from deferred string hash table. */
2748 labelno
= (*defstr
)->labelno
;
2749 STRING_POOL_ADDRESS_P (XEXP (rtl
, 0)) = 0;
2750 htab_clear_slot (const_str_htab
, (void **) defstr
);
2754 /* If this is the first time we've seen this particular constant,
2755 output it (or defer its output for later). */
2758 if (defer_addressed_constants_flag
|| after_function
)
2760 struct deferred_constant
*p
2761 = (struct deferred_constant
*)
2762 xmalloc (sizeof (struct deferred_constant
));
2764 p
->exp
= desc
->value
;
2766 p
->labelno
= labelno
;
2769 p
->next
= after_function_constants
;
2770 after_function_constants
= p
;
2774 p
->next
= deferred_constants
;
2775 deferred_constants
= p
;
2780 /* Do no output if -fsyntax-only. */
2781 if (! flag_syntax_only
)
2783 if (TREE_CODE (exp
) != STRING_CST
2785 || flag_writable_strings
2786 || (defstr
= (struct deferred_string
**)
2787 htab_find_slot_with_hash (const_str_htab
,
2789 STRHASH (desc
->label
),
2791 output_constant_def_contents (exp
, reloc
, labelno
);
2794 struct deferred_string
*p
;
2796 p
= (struct deferred_string
*)
2797 ggc_alloc (sizeof (struct deferred_string
));
2799 p
->exp
= desc
->value
;
2800 p
->label
= desc
->label
;
2801 p
->labelno
= labelno
;
2803 STRING_POOL_ADDRESS_P (XEXP (rtl
, 0)) = 1;
2812 /* Now output assembler code to define the label for EXP,
2813 and follow it with the data of EXP. */
2816 output_constant_def_contents (exp
, reloc
, labelno
)
2823 /* Align the location counter as required by EXP's data type. */
2824 align
= TYPE_ALIGN (TREE_TYPE (exp
));
2825 #ifdef CONSTANT_ALIGNMENT
2826 align
= CONSTANT_ALIGNMENT (exp
, align
);
2829 if (IN_NAMED_SECTION (exp
))
2830 named_section (exp
, NULL
, reloc
);
2832 (*targetm
.asm_out
.select_section
) (exp
, reloc
, align
);
2834 if (align
> BITS_PER_UNIT
)
2836 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2839 /* Output the label itself. */
2840 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file
, "LC", labelno
);
2842 /* Output the value of EXP. */
2843 output_constant (exp
,
2844 (TREE_CODE (exp
) == STRING_CST
2845 ? MAX (TREE_STRING_LENGTH (exp
),
2846 int_size_in_bytes (TREE_TYPE (exp
)))
2847 : int_size_in_bytes (TREE_TYPE (exp
))),
2852 /* Used in the hash tables to avoid outputting the same constant
2853 twice. Unlike 'struct constant_descriptor_tree', RTX constants
2854 are output once per function, not once per file; there seems
2855 to be no reason for the difference. */
2857 struct constant_descriptor_rtx
GTY(())
2859 /* More constant_descriptors with the same hash code. */
2860 struct constant_descriptor_rtx
*next
;
2862 /* The label of the constant. */
2865 /* A MEM for the constant. */
2868 /* The value of the constant. */
2869 struct rtx_const value
;
2872 /* Structure to represent sufficient information about a constant so that
2873 it can be output when the constant pool is output, so that function
2874 integration can be done, and to simplify handling on machines that reference
2875 constant pool as base+displacement. */
2877 struct pool_constant
GTY(())
2879 struct constant_descriptor_rtx
*desc
;
2880 struct pool_constant
*next
;
2881 struct pool_constant
*next_sym
;
2883 enum machine_mode mode
;
2886 HOST_WIDE_INT offset
;
2890 /* Hash code for a SYMBOL_REF with CONSTANT_POOL_ADDRESS_P true.
2891 The argument is XSTR (... , 0) */
2893 #define SYMHASH(LABEL) (((unsigned long) (LABEL)) % MAX_RTX_HASH_TABLE)
2895 /* Initialize constant pool hashing for a new function. */
2898 init_varasm_status (f
)
2901 struct varasm_status
*p
;
2902 p
= (struct varasm_status
*) ggc_alloc (sizeof (struct varasm_status
));
2904 p
->x_const_rtx_hash_table
2905 = ((struct constant_descriptor_rtx
**)
2906 ggc_alloc_cleared (MAX_RTX_HASH_TABLE
2907 * sizeof (struct constant_descriptor_rtx
*)));
2908 p
->x_const_rtx_sym_hash_table
2909 = ((struct pool_constant
**)
2910 ggc_alloc_cleared (MAX_RTX_HASH_TABLE
2911 * sizeof (struct pool_constant
*)));
2913 p
->x_first_pool
= p
->x_last_pool
= 0;
2914 p
->x_pool_offset
= 0;
2918 /* Express an rtx for a constant integer (perhaps symbolic)
2919 as the sum of a symbol or label plus an explicit integer.
2920 They are stored into VALUE. */
2923 decode_rtx_const (mode
, x
, value
)
2924 enum machine_mode mode
;
2926 struct rtx_const
*value
;
2928 /* Clear the whole structure, including any gaps. */
2929 memset (value
, 0, sizeof (struct rtx_const
));
2931 value
->kind
= RTX_INT
; /* Most usual kind. */
2934 switch (GET_CODE (x
))
2937 value
->kind
= RTX_DOUBLE
;
2938 if (GET_MODE (x
) != VOIDmode
)
2940 const REAL_VALUE_TYPE
*r
= CONST_DOUBLE_REAL_VALUE (x
);
2942 value
->mode
= GET_MODE (x
);
2944 /* Copy the REAL_VALUE_TYPE by members so that we don't
2945 copy garbage from the original structure into our
2946 carefully cleaned hashing structure. */
2947 value
->un
.du
.class = r
->class;
2948 value
->un
.du
.sign
= r
->sign
;
2955 value
->un
.du
.exp
= r
->exp
;
2958 memcpy (value
->un
.du
.sig
, r
->sig
, sizeof (r
->sig
));
2966 value
->un
.di
.low
= CONST_DOUBLE_LOW (x
);
2967 value
->un
.di
.high
= CONST_DOUBLE_HIGH (x
);
2975 units
= CONST_VECTOR_NUNITS (x
);
2976 value
->kind
= RTX_VECTOR
;
2979 if (GET_MODE_CLASS (mode
) == MODE_VECTOR_INT
)
2981 for (i
= 0; i
< units
; ++i
)
2983 rtx elt
= CONST_VECTOR_ELT (x
, i
);
2984 if (GET_CODE (elt
) == CONST_INT
)
2986 value
->un
.int_vec
[i
].low
= INTVAL (elt
);
2987 value
->un
.int_vec
[i
].high
= 0;
2991 value
->un
.int_vec
[i
].low
= CONST_DOUBLE_LOW (elt
);
2992 value
->un
.int_vec
[i
].high
= CONST_DOUBLE_HIGH (elt
);
2996 else if (GET_MODE_CLASS (mode
) == MODE_VECTOR_FLOAT
)
2998 for (i
= 0; i
< units
; ++i
)
3000 const REAL_VALUE_TYPE
*r
3001 = CONST_DOUBLE_REAL_VALUE (CONST_VECTOR_ELT (x
, i
));
3002 REAL_VALUE_TYPE
*d
= &value
->un
.fp_vec
[i
];
3004 /* Copy the REAL_VALUE_TYPE by members so that we don't
3005 copy garbage from the original structure into our
3006 carefully cleaned hashing structure. */
3007 d
->class = r
->class;
3018 memcpy (d
->sig
, r
->sig
, sizeof (r
->sig
));
3031 value
->un
.addr
.offset
= INTVAL (x
);
3037 value
->un
.addr
.base
= x
;
3042 if (GET_CODE (x
) == PLUS
&& GET_CODE (XEXP (x
, 1)) == CONST_INT
)
3044 value
->un
.addr
.base
= XEXP (x
, 0);
3045 value
->un
.addr
.offset
= INTVAL (XEXP (x
, 1));
3047 else if (GET_CODE (x
) == MINUS
&& GET_CODE (XEXP (x
, 1)) == CONST_INT
)
3049 value
->un
.addr
.base
= XEXP (x
, 0);
3050 value
->un
.addr
.offset
= - INTVAL (XEXP (x
, 1));
3054 value
->un
.addr
.base
= x
;
3055 value
->un
.addr
.offset
= 0;
3060 value
->kind
= RTX_UNKNOWN
;
3064 if (value
->kind
== RTX_INT
&& value
->un
.addr
.base
!= 0
3065 && GET_CODE (value
->un
.addr
.base
) == UNSPEC
)
3067 /* For a simple UNSPEC, the base is set to the
3068 operand, the kind field is set to the index of
3069 the unspec expression.
3070 Together with the code below, in case that
3071 the operand is a SYMBOL_REF or LABEL_REF,
3072 the address of the string or the code_label
3073 is taken as base. */
3074 if (XVECLEN (value
->un
.addr
.base
, 0) == 1)
3076 value
->kind
= RTX_UNSPEC
+ XINT (value
->un
.addr
.base
, 1);
3077 value
->un
.addr
.base
= XVECEXP (value
->un
.addr
.base
, 0, 0);
3081 if (value
->kind
>= RTX_INT
&& value
->un
.addr
.base
!= 0)
3082 switch (GET_CODE (value
->un
.addr
.base
))
3086 /* Use the string's address, not the SYMBOL_REF's address,
3087 for the sake of addresses of library routines. */
3088 value
->un
.addr
.base
= (rtx
) XSTR (value
->un
.addr
.base
, 0);
3093 /* For a LABEL_REF, compare labels. */
3094 value
->un
.addr
.base
= XEXP (value
->un
.addr
.base
, 0);
3101 /* Given a MINUS expression, simplify it if both sides
3102 include the same symbol. */
3105 simplify_subtraction (x
)
3108 struct rtx_const val0
, val1
;
3110 decode_rtx_const (GET_MODE (x
), XEXP (x
, 0), &val0
);
3111 decode_rtx_const (GET_MODE (x
), XEXP (x
, 1), &val1
);
3113 if (val0
.kind
>= RTX_INT
3114 && val0
.kind
== val1
.kind
3115 && val0
.un
.addr
.base
== val1
.un
.addr
.base
)
3116 return GEN_INT (val0
.un
.addr
.offset
- val1
.un
.addr
.offset
);
3121 /* Compute a hash code for a constant RTL expression. */
3124 const_hash_rtx (mode
, x
)
3125 enum machine_mode mode
;
3129 struct rtx_const value
;
3130 unsigned int data
[sizeof(struct rtx_const
) / sizeof (unsigned int)];
3136 decode_rtx_const (mode
, x
, &u
.value
);
3138 /* Compute hashing function */
3140 for (i
= 0; i
< ARRAY_SIZE (u
.data
); i
++)
3141 hi
= hi
* 613 + u
.data
[i
];
3143 return hi
% MAX_RTX_HASH_TABLE
;
3146 /* Compare a constant rtl object X with a constant-descriptor DESC.
3147 Return 1 if DESC describes a constant with the same value as X. */
3150 compare_constant_rtx (mode
, x
, desc
)
3151 enum machine_mode mode
;
3153 struct constant_descriptor_rtx
*desc
;
3155 struct rtx_const value
;
3157 decode_rtx_const (mode
, x
, &value
);
3159 /* Compare constant contents. */
3160 return memcmp (&value
, &desc
->value
, sizeof (struct rtx_const
)) == 0;
3163 /* Construct a constant descriptor for the rtl-expression X.
3164 It is up to the caller to enter the descriptor in the hash table. */
3166 static struct constant_descriptor_rtx
*
3167 record_constant_rtx (mode
, x
)
3168 enum machine_mode mode
;
3171 struct constant_descriptor_rtx
*ptr
;
3173 ptr
= (struct constant_descriptor_rtx
*) ggc_alloc (sizeof (*ptr
));
3174 decode_rtx_const (mode
, x
, &ptr
->value
);
3179 /* Given a constant rtx X, return a MEM for the location in memory at which
3180 this constant has been placed. Return 0 if it not has been placed yet. */
3183 mem_for_const_double (x
)
3186 enum machine_mode mode
= GET_MODE (x
);
3187 struct constant_descriptor_rtx
*desc
;
3189 for (desc
= const_rtx_hash_table
[const_hash_rtx (mode
, x
)]; desc
;
3191 if (compare_constant_rtx (mode
, x
, desc
))
3197 /* Given a constant rtx X, make (or find) a memory constant for its value
3198 and return a MEM rtx to refer to it in memory. */
3201 force_const_mem (mode
, x
)
3202 enum machine_mode mode
;
3206 struct constant_descriptor_rtx
*desc
;
3209 struct pool_constant
*pool
;
3212 /* Compute hash code of X. Search the descriptors for that hash code
3213 to see if any of them describes X. If yes, we have an rtx to use. */
3214 hash
= const_hash_rtx (mode
, x
);
3215 for (desc
= const_rtx_hash_table
[hash
]; desc
; desc
= desc
->next
)
3216 if (compare_constant_rtx (mode
, x
, desc
))
3219 /* No constant equal to X is known to have been output.
3220 Make a constant descriptor to enter X in the hash table
3221 and make a MEM for it. */
3222 desc
= record_constant_rtx (mode
, x
);
3223 desc
->next
= const_rtx_hash_table
[hash
];
3224 const_rtx_hash_table
[hash
] = desc
;
3226 /* Align the location counter as required by EXP's data type. */
3227 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3228 #ifdef CONSTANT_ALIGNMENT
3229 align
= CONSTANT_ALIGNMENT (make_tree ((*lang_hooks
.types
.type_for_mode
)
3230 (mode
, 0), x
), align
);
3233 pool_offset
+= (align
/ BITS_PER_UNIT
) - 1;
3234 pool_offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3236 if (GET_CODE (x
) == LABEL_REF
)
3237 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3239 /* Allocate a pool constant descriptor, fill it in, and chain it in. */
3240 pool
= (struct pool_constant
*) ggc_alloc (sizeof (struct pool_constant
));
3244 pool
->labelno
= const_labelno
;
3245 pool
->align
= align
;
3246 pool
->offset
= pool_offset
;
3253 last_pool
->next
= pool
;
3256 pool_offset
+= GET_MODE_SIZE (mode
);
3258 /* Create a string containing the label name, in LABEL. */
3259 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3263 /* Construct the SYMBOL_REF and the MEM. */
3265 pool
->desc
->rtl
= def
3266 = gen_rtx_MEM (mode
, gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
)));
3267 set_mem_alias_set (def
, const_alias_set
);
3268 set_mem_attributes (def
, (*lang_hooks
.types
.type_for_mode
) (mode
, 0), 1);
3269 RTX_UNCHANGING_P (def
) = 1;
3271 /* Add label to symbol hash table. */
3272 hash
= SYMHASH (XSTR (XEXP (def
, 0), 0));
3273 pool
->next_sym
= const_rtx_sym_hash_table
[hash
];
3274 const_rtx_sym_hash_table
[hash
] = pool
;
3276 /* Mark the symbol_ref as belonging to this constants pool. */
3277 CONSTANT_POOL_ADDRESS_P (XEXP (def
, 0)) = 1;
3278 current_function_uses_const_pool
= 1;
3283 /* Given a SYMBOL_REF with CONSTANT_POOL_ADDRESS_P true, return a pointer to
3284 the corresponding pool_constant structure. */
3286 static struct pool_constant
*
3287 find_pool_constant (f
, addr
)
3291 struct pool_constant
*pool
;
3292 const char *label
= XSTR (addr
, 0);
3294 for (pool
= f
->varasm
->x_const_rtx_sym_hash_table
[SYMHASH (label
)]; pool
;
3295 pool
= pool
->next_sym
)
3296 if (XSTR (XEXP (pool
->desc
->rtl
, 0), 0) == label
)
3302 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3305 get_pool_constant (addr
)
3308 return (find_pool_constant (cfun
, addr
))->constant
;
3311 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3312 and whether it has been output or not. */
3315 get_pool_constant_mark (addr
, pmarked
)
3319 struct pool_constant
*pool
= find_pool_constant (cfun
, addr
);
3320 *pmarked
= (pool
->mark
!= 0);
3321 return pool
->constant
;
3324 /* Likewise, but for the constant pool of a specific function. */
3327 get_pool_constant_for_function (f
, addr
)
3331 return (find_pool_constant (f
, addr
))->constant
;
3334 /* Similar, return the mode. */
3337 get_pool_mode (addr
)
3340 return (find_pool_constant (cfun
, addr
))->mode
;
3344 get_pool_mode_for_function (f
, addr
)
3348 return (find_pool_constant (f
, addr
))->mode
;
3351 /* Similar, return the offset in the constant pool. */
3354 get_pool_offset (addr
)
3357 return (find_pool_constant (cfun
, addr
))->offset
;
3360 /* Return the size of the constant pool. */
3368 /* Write all the constants in the constant pool. */
3371 output_constant_pool (fnname
, fndecl
)
3372 const char *fnname ATTRIBUTE_UNUSED
;
3373 tree fndecl ATTRIBUTE_UNUSED
;
3375 struct pool_constant
*pool
;
3379 /* It is possible for gcc to call force_const_mem and then to later
3380 discard the instructions which refer to the constant. In such a
3381 case we do not need to output the constant. */
3382 mark_constant_pool ();
3384 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3385 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool_offset
);
3388 for (pool
= first_pool
; pool
; pool
= pool
->next
)
3397 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3398 whose CODE_LABEL has been deleted. This can occur if a jump table
3399 is eliminated by optimization. If so, write a constant of zero
3400 instead. Note that this can also happen by turning the
3401 CODE_LABEL into a NOTE. */
3402 /* ??? This seems completely and utterly wrong. Certainly it's
3403 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3404 functioning even with INSN_DELETED_P and friends. */
3407 switch (GET_CODE (x
))
3410 if (GET_CODE (XEXP (x
, 0)) != PLUS
3411 || GET_CODE (XEXP (XEXP (x
, 0), 0)) != LABEL_REF
)
3413 tmp
= XEXP (XEXP (x
, 0), 0);
3418 if (INSN_DELETED_P (tmp
)
3419 || (GET_CODE (tmp
) == NOTE
3420 && NOTE_LINE_NUMBER (tmp
) == NOTE_INSN_DELETED
))
3431 /* First switch to correct section. */
3432 (*targetm
.asm_out
.select_rtx_section
) (pool
->mode
, x
, pool
->align
);
3434 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3435 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, pool
->mode
,
3436 pool
->align
, pool
->labelno
, done
);
3439 assemble_align (pool
->align
);
3441 /* Output the label. */
3442 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file
, "LC", pool
->labelno
);
3444 /* Output the value of the constant itself. */
3445 switch (GET_MODE_CLASS (pool
->mode
))
3448 if (GET_CODE (x
) != CONST_DOUBLE
)
3451 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3452 assemble_real (r
, pool
->mode
, pool
->align
);
3456 case MODE_PARTIAL_INT
:
3457 assemble_integer (x
, GET_MODE_SIZE (pool
->mode
), pool
->align
, 1);
3460 case MODE_VECTOR_FLOAT
:
3465 if (GET_CODE (x
) != CONST_VECTOR
)
3468 units
= CONST_VECTOR_NUNITS (x
);
3470 for (i
= 0; i
< units
; i
++)
3472 elt
= CONST_VECTOR_ELT (x
, i
);
3473 REAL_VALUE_FROM_CONST_DOUBLE (r
, elt
);
3474 assemble_real (r
, GET_MODE_INNER (pool
->mode
), pool
->align
);
3479 case MODE_VECTOR_INT
:
3484 if (GET_CODE (x
) != CONST_VECTOR
)
3487 units
= CONST_VECTOR_NUNITS (x
);
3489 for (i
= 0; i
< units
; i
++)
3491 elt
= CONST_VECTOR_ELT (x
, i
);
3492 assemble_integer (elt
, GET_MODE_UNIT_SIZE (pool
->mode
),
3502 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3503 sections have proper size. */
3504 if (pool
->align
> GET_MODE_BITSIZE (pool
->mode
)
3505 && in_section
== in_named
3506 && get_named_section_flags (in_named_name
) & SECTION_MERGE
)
3507 assemble_align (pool
->align
);
3509 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3514 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3515 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool_offset
);
3518 /* Done with this pool. */
3519 first_pool
= last_pool
= 0;
3522 /* Look through the instructions for this function, and mark all the
3523 entries in the constant pool which are actually being used.
3524 Emit used deferred strings. */
3527 mark_constant_pool ()
3531 struct pool_constant
*pool
;
3533 if (first_pool
== 0 && htab_elements (const_str_htab
) == 0)
3536 for (pool
= first_pool
; pool
; pool
= pool
->next
)
3539 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3541 mark_constants (PATTERN (insn
));
3543 for (link
= current_function_epilogue_delay_list
;
3545 link
= XEXP (link
, 1))
3547 insn
= XEXP (link
, 0);
3550 mark_constants (PATTERN (insn
));
3554 /* Look through appropriate parts of X, marking all entries in the
3555 constant pool which are actually being used. Entries that are only
3556 referenced by other constants are also marked as used. Emit
3557 deferred strings that are used. */
3564 const char *format_ptr
;
3569 if (GET_CODE (x
) == SYMBOL_REF
)
3571 mark_constant (&x
, NULL
);
3575 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3576 insns, not any notes that may be attached. We don't want to mark
3577 a constant just because it happens to appear in a REG_EQUIV note. */
3580 mark_constants (PATTERN (x
));
3584 format_ptr
= GET_RTX_FORMAT (GET_CODE (x
));
3586 for (i
= 0; i
< GET_RTX_LENGTH (GET_CODE (x
)); i
++)
3588 switch (*format_ptr
++)
3591 mark_constants (XEXP (x
, i
));
3595 if (XVEC (x
, i
) != 0)
3599 for (j
= 0; j
< XVECLEN (x
, i
); j
++)
3600 mark_constants (XVECEXP (x
, i
, j
));
3620 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3621 to as used. Emit referenced deferred strings. This function can
3622 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3625 mark_constant (current_rtx
, data
)
3627 void *data ATTRIBUTE_UNUSED
;
3629 rtx x
= *current_rtx
;
3634 else if (GET_CODE (x
) == SYMBOL_REF
)
3636 if (CONSTANT_POOL_ADDRESS_P (x
))
3638 struct pool_constant
*pool
= find_pool_constant (cfun
, x
);
3639 if (pool
->mark
== 0)
3642 for_each_rtx (&(pool
->constant
), &mark_constant
, NULL
);
3647 else if (STRING_POOL_ADDRESS_P (x
))
3649 struct deferred_string
**defstr
;
3651 defstr
= (struct deferred_string
**)
3652 htab_find_slot_with_hash (const_str_htab
, XSTR (x
, 0),
3653 STRHASH (XSTR (x
, 0)), NO_INSERT
);
3656 struct deferred_string
*p
= *defstr
;
3658 STRING_POOL_ADDRESS_P (x
) = 0;
3659 output_constant_def_contents (p
->exp
, 0, p
->labelno
);
3660 htab_clear_slot (const_str_htab
, (void **) defstr
);
3667 /* Find all the constants whose addresses are referenced inside of EXP,
3668 and make sure assembler code with a label has been output for each one.
3669 Indicate whether an ADDR_EXPR has been encountered. */
3672 output_addressed_constants (exp
)
3675 int reloc
= 0, reloc2
;
3678 /* Give the front-end a chance to convert VALUE to something that
3679 looks more like a constant to the back-end. */
3680 exp
= (*lang_hooks
.expand_constant
) (exp
);
3682 switch (TREE_CODE (exp
))
3686 /* Go inside any operations that get_inner_reference can handle and see
3687 if what's inside is a constant: no need to do anything here for
3688 addresses of variables or functions. */
3689 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3690 tem
= TREE_OPERAND (tem
, 0))
3693 if (TREE_CODE_CLASS (TREE_CODE (tem
)) == 'c'
3694 || TREE_CODE (tem
) == CONSTRUCTOR
)
3695 output_constant_def (tem
, 0);
3697 if (TREE_PUBLIC (tem
))
3704 reloc
= output_addressed_constants (TREE_OPERAND (exp
, 0));
3705 reloc
|= output_addressed_constants (TREE_OPERAND (exp
, 1));
3709 reloc
= output_addressed_constants (TREE_OPERAND (exp
, 0));
3710 reloc2
= output_addressed_constants (TREE_OPERAND (exp
, 1));
3711 /* The difference of two local labels is computable at link time. */
3712 if (reloc
== 1 && reloc2
== 1)
3720 case NON_LVALUE_EXPR
:
3721 reloc
= output_addressed_constants (TREE_OPERAND (exp
, 0));
3725 for (tem
= CONSTRUCTOR_ELTS (exp
); tem
; tem
= TREE_CHAIN (tem
))
3726 if (TREE_VALUE (tem
) != 0)
3727 reloc
|= output_addressed_constants (TREE_VALUE (tem
));
3737 /* Return nonzero if VALUE is a valid constant-valued expression
3738 for use in initializing a static variable; one that can be an
3739 element of a "constant" initializer.
3741 Return null_pointer_node if the value is absolute;
3742 if it is relocatable, return the variable that determines the relocation.
3743 We assume that VALUE has been folded as much as possible;
3744 therefore, we do not need to check for such things as
3745 arithmetic-combinations of integers. */
3748 initializer_constant_valid_p (value
, endtype
)
3752 /* Give the front-end a chance to convert VALUE to something that
3753 looks more like a constant to the back-end. */
3754 value
= (*lang_hooks
.expand_constant
) (value
);
3756 switch (TREE_CODE (value
))
3759 if ((TREE_CODE (TREE_TYPE (value
)) == UNION_TYPE
3760 || TREE_CODE (TREE_TYPE (value
)) == RECORD_TYPE
)
3761 && TREE_CONSTANT (value
)
3762 && CONSTRUCTOR_ELTS (value
))
3764 initializer_constant_valid_p (TREE_VALUE (CONSTRUCTOR_ELTS (value
)),
3767 return TREE_STATIC (value
) ? null_pointer_node
: 0;
3774 return null_pointer_node
;
3778 return staticp (TREE_OPERAND (value
, 0)) ? TREE_OPERAND (value
, 0) : 0;
3780 case VIEW_CONVERT_EXPR
:
3781 case NON_LVALUE_EXPR
:
3782 return initializer_constant_valid_p (TREE_OPERAND (value
, 0), endtype
);
3786 /* Allow conversions between pointer types. */
3787 if (POINTER_TYPE_P (TREE_TYPE (value
))
3788 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (value
, 0))))
3789 return initializer_constant_valid_p (TREE_OPERAND (value
, 0), endtype
);
3791 /* Allow conversions between real types. */
3792 if (FLOAT_TYPE_P (TREE_TYPE (value
))
3793 && FLOAT_TYPE_P (TREE_TYPE (TREE_OPERAND (value
, 0))))
3794 return initializer_constant_valid_p (TREE_OPERAND (value
, 0), endtype
);
3796 /* Allow length-preserving conversions between integer types. */
3797 if (INTEGRAL_TYPE_P (TREE_TYPE (value
))
3798 && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (value
, 0)))
3799 && (TYPE_PRECISION (TREE_TYPE (value
))
3800 == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value
, 0)))))
3801 return initializer_constant_valid_p (TREE_OPERAND (value
, 0), endtype
);
3803 /* Allow conversions between other integer types only if
3805 if (INTEGRAL_TYPE_P (TREE_TYPE (value
))
3806 && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (value
, 0))))
3808 tree inner
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
3810 if (inner
== null_pointer_node
)
3811 return null_pointer_node
;
3815 /* Allow (int) &foo provided int is as wide as a pointer. */
3816 if (INTEGRAL_TYPE_P (TREE_TYPE (value
))
3817 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (value
, 0)))
3818 && (TYPE_PRECISION (TREE_TYPE (value
))
3819 >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value
, 0)))))
3820 return initializer_constant_valid_p (TREE_OPERAND (value
, 0),
3823 /* Likewise conversions from int to pointers, but also allow
3824 conversions from 0. */
3825 if (POINTER_TYPE_P (TREE_TYPE (value
))
3826 && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (value
, 0))))
3828 if (integer_zerop (TREE_OPERAND (value
, 0)))
3829 return null_pointer_node
;
3830 else if (TYPE_PRECISION (TREE_TYPE (value
))
3831 <= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value
, 0))))
3832 return initializer_constant_valid_p (TREE_OPERAND (value
, 0),
3836 /* Allow conversions to union types if the value inside is okay. */
3837 if (TREE_CODE (TREE_TYPE (value
)) == UNION_TYPE
)
3838 return initializer_constant_valid_p (TREE_OPERAND (value
, 0),
3843 if (! INTEGRAL_TYPE_P (endtype
)
3844 || TYPE_PRECISION (endtype
) >= POINTER_SIZE
)
3846 tree valid0
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
3848 tree valid1
= initializer_constant_valid_p (TREE_OPERAND (value
, 1),
3850 /* If either term is absolute, use the other terms relocation. */
3851 if (valid0
== null_pointer_node
)
3853 if (valid1
== null_pointer_node
)
3859 if (! INTEGRAL_TYPE_P (endtype
)
3860 || TYPE_PRECISION (endtype
) >= POINTER_SIZE
)
3862 tree valid0
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
3864 tree valid1
= initializer_constant_valid_p (TREE_OPERAND (value
, 1),
3866 /* Win if second argument is absolute. */
3867 if (valid1
== null_pointer_node
)
3869 /* Win if both arguments have the same relocation.
3870 Then the value is absolute. */
3871 if (valid0
== valid1
&& valid0
!= 0)
3872 return null_pointer_node
;
3874 /* Since GCC guarantees that string constants are unique in the
3875 generated code, a subtraction between two copies of the same
3876 constant string is absolute. */
3877 if (valid0
&& TREE_CODE (valid0
) == STRING_CST
&&
3878 valid1
&& TREE_CODE (valid1
) == STRING_CST
&&
3879 TREE_STRING_POINTER (valid0
) == TREE_STRING_POINTER (valid1
))
3880 return null_pointer_node
;
3883 /* Support differences between labels. */
3884 if (INTEGRAL_TYPE_P (endtype
))
3887 op0
= TREE_OPERAND (value
, 0);
3888 op1
= TREE_OPERAND (value
, 1);
3890 /* Like STRIP_NOPS except allow the operand mode to widen.
3891 This works around a feature of fold that simplfies
3892 (int)(p1 - p2) to ((int)p1 - (int)p2) under the theory
3893 that the narrower operation is cheaper. */
3895 while (TREE_CODE (op0
) == NOP_EXPR
3896 || TREE_CODE (op0
) == CONVERT_EXPR
3897 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
3899 tree inner
= TREE_OPERAND (op0
, 0);
3900 if (inner
== error_mark_node
3901 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
3902 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
3903 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
3908 while (TREE_CODE (op1
) == NOP_EXPR
3909 || TREE_CODE (op1
) == CONVERT_EXPR
3910 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
3912 tree inner
= TREE_OPERAND (op1
, 0);
3913 if (inner
== error_mark_node
3914 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
3915 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
3916 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
3921 if (TREE_CODE (op0
) == ADDR_EXPR
3922 && TREE_CODE (TREE_OPERAND (op0
, 0)) == LABEL_DECL
3923 && TREE_CODE (op1
) == ADDR_EXPR
3924 && TREE_CODE (TREE_OPERAND (op1
, 0)) == LABEL_DECL
)
3925 return null_pointer_node
;
3936 /* Output assembler code for constant EXP to FILE, with no label.
3937 This includes the pseudo-op such as ".int" or ".byte", and a newline.
3938 Assumes output_addressed_constants has been done on EXP already.
3940 Generate exactly SIZE bytes of assembler data, padding at the end
3941 with zeros if necessary. SIZE must always be specified.
3943 SIZE is important for structure constructors,
3944 since trailing members may have been omitted from the constructor.
3945 It is also important for initialization of arrays from string constants
3946 since the full length of the string constant might not be wanted.
3947 It is also needed for initialization of unions, where the initializer's
3948 type is just one member, and that may not be as long as the union.
3950 There a case in which we would fail to output exactly SIZE bytes:
3951 for a structure constructor that wants to produce more than SIZE bytes.
3952 But such constructors will never be generated for any possible input.
3954 ALIGN is the alignment of the data in bits. */
3957 output_constant (exp
, size
, align
)
3962 enum tree_code code
;
3963 HOST_WIDE_INT thissize
;
3965 /* Some front-ends use constants other than the standard language-indepdent
3966 varieties, but which may still be output directly. Give the front-end a
3967 chance to convert EXP to a language-independent representation. */
3968 exp
= (*lang_hooks
.expand_constant
) (exp
);
3970 if (size
== 0 || flag_syntax_only
)
3973 /* Eliminate any conversions since we'll be outputting the underlying
3975 while (TREE_CODE (exp
) == NOP_EXPR
|| TREE_CODE (exp
) == CONVERT_EXPR
3976 || TREE_CODE (exp
) == NON_LVALUE_EXPR
3977 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
3978 exp
= TREE_OPERAND (exp
, 0);
3980 code
= TREE_CODE (TREE_TYPE (exp
));
3981 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
3983 /* Allow a constructor with no elements for any data type.
3984 This means to fill the space with zeros. */
3985 if (TREE_CODE (exp
) == CONSTRUCTOR
&& CONSTRUCTOR_ELTS (exp
) == 0)
3987 assemble_zeros (size
);
3991 if (TREE_CODE (exp
) == FDESC_EXPR
)
3993 #ifdef ASM_OUTPUT_FDESC
3994 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
3995 tree decl
= TREE_OPERAND (exp
, 0);
3996 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4003 /* Now output the underlying data. If we've handling the padding, return.
4004 Otherwise, break and ensure THISSIZE is the size written. */
4012 case REFERENCE_TYPE
:
4013 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4014 EXPAND_INITIALIZER
),
4016 error ("initializer for integer value is too complicated");
4020 if (TREE_CODE (exp
) != REAL_CST
)
4021 error ("initializer for floating value is not a floating constant");
4023 assemble_real (TREE_REAL_CST (exp
),
4024 mode_for_size (size
* BITS_PER_UNIT
, MODE_FLOAT
, 0),
4029 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4030 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4031 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4036 if (TREE_CODE (exp
) == CONSTRUCTOR
)
4038 output_constructor (exp
, size
, align
);
4041 else if (TREE_CODE (exp
) == STRING_CST
)
4043 thissize
= MIN (TREE_STRING_LENGTH (exp
), size
);
4044 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4052 if (TREE_CODE (exp
) == CONSTRUCTOR
)
4053 output_constructor (exp
, size
, align
);
4059 if (TREE_CODE (exp
) == INTEGER_CST
)
4060 assemble_integer (expand_expr (exp
, NULL_RTX
,
4061 VOIDmode
, EXPAND_INITIALIZER
),
4062 thissize
, align
, 1);
4063 else if (TREE_CODE (exp
) == CONSTRUCTOR
)
4065 unsigned char *buffer
= (unsigned char *) alloca (thissize
);
4066 if (get_set_constructor_bytes (exp
, buffer
, thissize
))
4068 assemble_string ((char *) buffer
, thissize
);
4071 error ("unknown set constructor type");
4083 assemble_zeros (size
);
4087 /* Subroutine of output_constructor, used for computing the size of
4088 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4089 type with an unspecified upper bound. */
4091 static unsigned HOST_WIDE_INT
4092 array_size_for_constructor (val
)
4097 /* This code used to attempt to handle string constants that are not
4098 arrays of single-bytes, but nothing else does, so there's no point in
4100 if (TREE_CODE (val
) == STRING_CST
)
4101 return TREE_STRING_LENGTH (val
);
4103 max_index
= NULL_TREE
;
4104 for (i
= CONSTRUCTOR_ELTS (val
); i
; i
= TREE_CHAIN (i
))
4106 tree index
= TREE_PURPOSE (i
);
4108 if (TREE_CODE (index
) == RANGE_EXPR
)
4109 index
= TREE_OPERAND (index
, 1);
4110 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4114 if (max_index
== NULL_TREE
)
4117 /* Compute the total number of array elements. */
4118 i
= size_binop (MINUS_EXPR
, convert (sizetype
, max_index
),
4120 TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)))));
4121 i
= size_binop (PLUS_EXPR
, i
, convert (sizetype
, integer_one_node
));
4123 /* Multiply by the array element unit size to find number of bytes. */
4124 i
= size_binop (MULT_EXPR
, i
, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4126 return tree_low_cst (i
, 1);
4129 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4130 Generate at least SIZE bytes, padding if necessary. */
4133 output_constructor (exp
, size
, align
)
4138 tree type
= TREE_TYPE (exp
);
4139 tree link
, field
= 0;
4141 /* Number of bytes output or skipped so far.
4142 In other words, current position within the constructor. */
4143 HOST_WIDE_INT total_bytes
= 0;
4144 /* Non-zero means BYTE contains part of a byte, to be output. */
4145 int byte_buffer_in_use
= 0;
4148 if (HOST_BITS_PER_WIDE_INT
< BITS_PER_UNIT
)
4151 if (TREE_CODE (type
) == RECORD_TYPE
)
4152 field
= TYPE_FIELDS (type
);
4154 if (TREE_CODE (type
) == ARRAY_TYPE
4155 && TYPE_DOMAIN (type
) != 0)
4156 min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (type
));
4158 /* As LINK goes through the elements of the constant,
4159 FIELD goes through the structure fields, if the constant is a structure.
4160 if the constant is a union, then we override this,
4161 by getting the field from the TREE_LIST element.
4162 But the constant could also be an array. Then FIELD is zero.
4164 There is always a maximum of one element in the chain LINK for unions
4165 (even if the initializer in a source program incorrectly contains
4167 for (link
= CONSTRUCTOR_ELTS (exp
);
4169 link
= TREE_CHAIN (link
),
4170 field
= field
? TREE_CHAIN (field
) : 0)
4172 tree val
= TREE_VALUE (link
);
4175 /* The element in a union constructor specifies the proper field
4177 if ((TREE_CODE (type
) == RECORD_TYPE
|| TREE_CODE (type
) == UNION_TYPE
4178 || TREE_CODE (type
) == QUAL_UNION_TYPE
)
4179 && TREE_PURPOSE (link
) != 0)
4180 field
= TREE_PURPOSE (link
);
4182 else if (TREE_CODE (type
) == ARRAY_TYPE
)
4183 index
= TREE_PURPOSE (link
);
4185 /* Eliminate the marker that makes a cast not be an lvalue. */
4189 if (index
&& TREE_CODE (index
) == RANGE_EXPR
)
4191 unsigned HOST_WIDE_INT fieldsize
4192 = int_size_in_bytes (TREE_TYPE (type
));
4193 HOST_WIDE_INT lo_index
= tree_low_cst (TREE_OPERAND (index
, 0), 0);
4194 HOST_WIDE_INT hi_index
= tree_low_cst (TREE_OPERAND (index
, 1), 0);
4195 HOST_WIDE_INT index
;
4196 unsigned int align2
= min_align (align
, fieldsize
* BITS_PER_UNIT
);
4198 for (index
= lo_index
; index
<= hi_index
; index
++)
4200 /* Output the element's initial value. */
4202 assemble_zeros (fieldsize
);
4204 output_constant (val
, fieldsize
, align2
);
4206 /* Count its size. */
4207 total_bytes
+= fieldsize
;
4210 else if (field
== 0 || !DECL_BIT_FIELD (field
))
4212 /* An element that is not a bit-field. */
4214 unsigned HOST_WIDE_INT fieldsize
;
4215 /* Since this structure is static,
4216 we know the positions are constant. */
4217 HOST_WIDE_INT pos
= field
? int_byte_position (field
) : 0;
4218 unsigned int align2
;
4221 pos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val
)), 1)
4222 * (tree_low_cst (index
, 0) - tree_low_cst (min_index
, 0)));
4224 /* Output any buffered-up bit-fields preceding this element. */
4225 if (byte_buffer_in_use
)
4227 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4229 byte_buffer_in_use
= 0;
4232 /* Advance to offset of this element.
4233 Note no alignment needed in an array, since that is guaranteed
4234 if each element has the proper size. */
4235 if ((field
!= 0 || index
!= 0) && pos
!= total_bytes
)
4237 assemble_zeros (pos
- total_bytes
);
4241 /* Find the alignment of this element. */
4242 align2
= min_align (align
, BITS_PER_UNIT
* pos
);
4244 /* Determine size this element should occupy. */
4249 /* If this is an array with an unspecified upper bound,
4250 the initializer determines the size. */
4251 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4252 but we cannot do this until the deprecated support for
4253 initializing zero-length array members is removed. */
4254 if (TREE_CODE (TREE_TYPE (field
)) == ARRAY_TYPE
4255 && TYPE_DOMAIN (TREE_TYPE (field
))
4256 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field
))))
4258 fieldsize
= array_size_for_constructor (val
);
4259 /* Given a non-empty initialization, this field had
4261 if (fieldsize
!= 0 && TREE_CHAIN (field
) != NULL_TREE
)
4264 else if (DECL_SIZE_UNIT (field
))
4266 /* ??? This can't be right. If the decl size overflows
4267 a host integer we will silently emit no data. */
4268 if (host_integerp (DECL_SIZE_UNIT (field
), 1))
4269 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (field
), 1);
4273 fieldsize
= int_size_in_bytes (TREE_TYPE (type
));
4275 /* Output the element's initial value. */
4277 assemble_zeros (fieldsize
);
4279 output_constant (val
, fieldsize
, align2
);
4281 /* Count its size. */
4282 total_bytes
+= fieldsize
;
4284 else if (val
!= 0 && TREE_CODE (val
) != INTEGER_CST
)
4285 error ("invalid initial value for member `%s'",
4286 IDENTIFIER_POINTER (DECL_NAME (field
)));
4289 /* Element that is a bit-field. */
4291 HOST_WIDE_INT next_offset
= int_bit_position (field
);
4292 HOST_WIDE_INT end_offset
4293 = (next_offset
+ tree_low_cst (DECL_SIZE (field
), 1));
4296 val
= integer_zero_node
;
4298 /* If this field does not start in this (or, next) byte,
4300 if (next_offset
/ BITS_PER_UNIT
!= total_bytes
)
4302 /* Output remnant of any bit field in previous bytes. */
4303 if (byte_buffer_in_use
)
4305 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4307 byte_buffer_in_use
= 0;
4310 /* If still not at proper byte, advance to there. */
4311 if (next_offset
/ BITS_PER_UNIT
!= total_bytes
)
4313 assemble_zeros (next_offset
/ BITS_PER_UNIT
- total_bytes
);
4314 total_bytes
= next_offset
/ BITS_PER_UNIT
;
4318 if (! byte_buffer_in_use
)
4321 /* We must split the element into pieces that fall within
4322 separate bytes, and combine each byte with previous or
4323 following bit-fields. */
4325 /* next_offset is the offset n fbits from the beginning of
4326 the structure to the next bit of this element to be processed.
4327 end_offset is the offset of the first bit past the end of
4329 while (next_offset
< end_offset
)
4333 HOST_WIDE_INT value
;
4334 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4335 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4337 /* Advance from byte to byte
4338 within this element when necessary. */
4339 while (next_byte
!= total_bytes
)
4341 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4346 /* Number of bits we can process at once
4347 (all part of the same byte). */
4348 this_time
= MIN (end_offset
- next_offset
,
4349 BITS_PER_UNIT
- next_bit
);
4350 if (BYTES_BIG_ENDIAN
)
4352 /* On big-endian machine, take the most significant bits
4353 first (of the bits that are significant)
4354 and put them into bytes from the most significant end. */
4355 shift
= end_offset
- next_offset
- this_time
;
4357 /* Don't try to take a bunch of bits that cross
4358 the word boundary in the INTEGER_CST. We can
4359 only select bits from the LOW or HIGH part
4361 if (shift
< HOST_BITS_PER_WIDE_INT
4362 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4364 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4365 shift
= HOST_BITS_PER_WIDE_INT
;
4368 /* Now get the bits from the appropriate constant word. */
4369 if (shift
< HOST_BITS_PER_WIDE_INT
)
4370 value
= TREE_INT_CST_LOW (val
);
4371 else if (shift
< 2 * HOST_BITS_PER_WIDE_INT
)
4373 value
= TREE_INT_CST_HIGH (val
);
4374 shift
-= HOST_BITS_PER_WIDE_INT
;
4379 /* Get the result. This works only when:
4380 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4381 byte
|= (((value
>> shift
)
4382 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4383 << (BITS_PER_UNIT
- this_time
- next_bit
));
4387 /* On little-endian machines,
4388 take first the least significant bits of the value
4389 and pack them starting at the least significant
4390 bits of the bytes. */
4391 shift
= next_offset
- int_bit_position (field
);
4393 /* Don't try to take a bunch of bits that cross
4394 the word boundary in the INTEGER_CST. We can
4395 only select bits from the LOW or HIGH part
4397 if (shift
< HOST_BITS_PER_WIDE_INT
4398 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4399 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
4401 /* Now get the bits from the appropriate constant word. */
4402 if (shift
< HOST_BITS_PER_WIDE_INT
)
4403 value
= TREE_INT_CST_LOW (val
);
4404 else if (shift
< 2 * HOST_BITS_PER_WIDE_INT
)
4406 value
= TREE_INT_CST_HIGH (val
);
4407 shift
-= HOST_BITS_PER_WIDE_INT
;
4412 /* Get the result. This works only when:
4413 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4414 byte
|= (((value
>> shift
)
4415 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4419 next_offset
+= this_time
;
4420 byte_buffer_in_use
= 1;
4425 if (byte_buffer_in_use
)
4427 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4431 if (total_bytes
< size
)
4432 assemble_zeros (size
- total_bytes
);
4435 /* This TREE_LIST contains any weak symbol declarations waiting
4437 static GTY(()) tree weak_decls
;
4439 /* Mark DECL as weak. */
4445 DECL_WEAK (decl
) = 1;
4447 if (DECL_RTL_SET_P (decl
)
4448 && GET_CODE (DECL_RTL (decl
)) == MEM
4449 && XEXP (DECL_RTL (decl
), 0)
4450 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
4451 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
4454 /* Merge weak status between NEWDECL and OLDDECL. */
4457 merge_weak (newdecl
, olddecl
)
4461 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
4464 if (DECL_WEAK (newdecl
))
4468 /* NEWDECL is weak, but OLDDECL is not. */
4470 /* If we already output the OLDDECL, we're in trouble; we can't
4471 go back and make it weak. This error cannot caught in
4472 declare_weak because the NEWDECL and OLDDECL was not yet
4473 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4474 if (TREE_ASM_WRITTEN (olddecl
))
4475 error_with_decl (newdecl
,
4476 "weak declaration of `%s' must precede definition");
4478 /* If we've already generated rtl referencing OLDDECL, we may
4479 have done so in a way that will not function properly with
4481 else if (TREE_USED (olddecl
)
4482 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)))
4483 warning_with_decl (newdecl
, "weak declaration of `%s' after first use results in unspecified behavior");
4487 /* We put the NEWDECL on the weak_decls list at some point.
4488 Replace it with the OLDDECL. */
4489 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
4490 if (TREE_VALUE (wd
) == newdecl
)
4492 TREE_VALUE (wd
) = olddecl
;
4495 /* We may not find the entry on the list. If NEWDECL is a
4496 weak alias, then we will have already called
4497 globalize_decl to remove the entry; in that case, we do
4498 not need to do anything. */
4501 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4502 mark_weak (olddecl
);
4505 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4506 weak. Just update NEWDECL to indicate that it's weak too. */
4507 mark_weak (newdecl
);
4510 /* Declare DECL to be a weak symbol. */
4516 if (! TREE_PUBLIC (decl
))
4517 error_with_decl (decl
, "weak declaration of `%s' must be public");
4518 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& TREE_ASM_WRITTEN (decl
))
4519 error_with_decl (decl
, "weak declaration of `%s' must precede definition");
4520 else if (SUPPORTS_WEAK
)
4522 if (! DECL_WEAK (decl
))
4523 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
4526 warning_with_decl (decl
, "weak declaration of `%s' not supported");
4531 /* Emit any pending weak declarations. */
4538 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
4540 tree decl
= TREE_VALUE (t
);
4541 const char *name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
4543 if (! TREE_USED (decl
))
4546 #ifdef ASM_WEAKEN_DECL
4547 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
4549 #ifdef ASM_WEAKEN_LABEL
4550 ASM_WEAKEN_LABEL (asm_out_file
, name
);
4552 #ifdef ASM_OUTPUT_WEAK_ALIAS
4553 warning ("only weak aliases are supported in this configuration");
4561 /* Emit the assembly bits to indicate that DECL is globally visible. */
4564 globalize_decl (decl
)
4567 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
4569 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
4570 if (DECL_WEAK (decl
))
4574 #ifdef ASM_WEAKEN_DECL
4575 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
4577 ASM_WEAKEN_LABEL (asm_out_file
, name
);
4580 /* Remove this function from the pending weak list so that
4581 we do not emit multiple .weak directives for it. */
4582 for (p
= &weak_decls
; (t
= *p
) ; )
4584 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
4585 *p
= TREE_CHAIN (t
);
4587 p
= &TREE_CHAIN (t
);
4593 (*targetm
.asm_out
.globalize_label
) (asm_out_file
, name
);
4596 /* Emit an assembler directive to make the symbol for DECL an alias to
4597 the symbol for TARGET. */
4600 assemble_alias (decl
, target
)
4601 tree decl
, target ATTRIBUTE_UNUSED
;
4605 /* We must force creation of DECL_RTL for debug info generation, even though
4606 we don't use it here. */
4607 make_decl_rtl (decl
, NULL
);
4609 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
4611 #ifdef ASM_OUTPUT_DEF
4612 /* Make name accessible from other files, if appropriate. */
4614 if (TREE_PUBLIC (decl
))
4616 globalize_decl (decl
);
4617 maybe_assemble_visibility (decl
);
4620 #ifdef ASM_OUTPUT_DEF_FROM_DECLS
4621 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
4623 ASM_OUTPUT_DEF (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
4625 #else /* !ASM_OUTPUT_DEF */
4626 #if defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
4627 if (! DECL_WEAK (decl
))
4628 warning ("only weak aliases are supported in this configuration");
4630 #ifdef ASM_WEAKEN_DECL
4631 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
4633 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
4636 warning ("alias definitions not supported in this configuration; ignored");
4640 TREE_USED (decl
) = 1;
4641 TREE_ASM_WRITTEN (decl
) = 1;
4642 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
4645 /* Emit an assembler directive to set symbol for DECL visibility to
4649 default_assemble_visibility (decl
, visibility_type
)
4651 const char *visibility_type ATTRIBUTE_UNUSED
;
4655 name
= (* targetm
.strip_name_encoding
)
4656 (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)));
4658 #ifdef HAVE_GAS_HIDDEN
4659 fprintf (asm_out_file
, "\t.%s\t%s\n", visibility_type
, name
);
4661 warning ("visibility attribute not supported in this configuration; ignored");
4665 /* A helper function to call assemble_visibility when needed for a decl. */
4668 maybe_assemble_visibility (decl
)
4671 tree visibility
= lookup_attribute ("visibility", DECL_ATTRIBUTES (decl
));
4675 = TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (visibility
)));
4676 (* targetm
.asm_out
.visibility
) (decl
, type
);
4680 /* Returns 1 if the target configuration supports defining public symbols
4681 so that one of them will be chosen at link time instead of generating a
4682 multiply-defined symbol error, whether through the use of weak symbols or
4683 a target-specific mechanism for having duplicates discarded. */
4686 supports_one_only ()
4688 if (SUPPORTS_ONE_ONLY
)
4690 return SUPPORTS_WEAK
;
4693 /* Set up DECL as a public symbol that can be defined in multiple
4694 translation units without generating a linker error. */
4697 make_decl_one_only (decl
)
4700 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != FUNCTION_DECL
)
4703 TREE_PUBLIC (decl
) = 1;
4705 if (TREE_CODE (decl
) == VAR_DECL
4706 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
4707 DECL_COMMON (decl
) = 1;
4708 else if (SUPPORTS_ONE_ONLY
)
4710 #ifdef MAKE_DECL_ONE_ONLY
4711 MAKE_DECL_ONE_ONLY (decl
);
4713 DECL_ONE_ONLY (decl
) = 1;
4715 else if (SUPPORTS_WEAK
)
4716 DECL_WEAK (decl
) = 1;
4724 const_str_htab
= htab_create_ggc (128, const_str_htab_hash
,
4725 const_str_htab_eq
, NULL
);
4726 in_named_htab
= htab_create (31, in_named_entry_hash
,
4727 in_named_entry_eq
, NULL
);
4729 const_alias_set
= new_alias_set ();
4733 decl_tls_model (decl
)
4736 enum tls_model kind
;
4737 tree attr
= lookup_attribute ("tls_model", DECL_ATTRIBUTES (decl
));
4742 attr
= TREE_VALUE (TREE_VALUE (attr
));
4743 if (TREE_CODE (attr
) != STRING_CST
)
4745 if (!strcmp (TREE_STRING_POINTER (attr
), "local-exec"))
4746 kind
= TLS_MODEL_LOCAL_EXEC
;
4747 else if (!strcmp (TREE_STRING_POINTER (attr
), "initial-exec"))
4748 kind
= TLS_MODEL_INITIAL_EXEC
;
4749 else if (!strcmp (TREE_STRING_POINTER (attr
), "local-dynamic"))
4750 kind
= optimize
? TLS_MODEL_LOCAL_DYNAMIC
: TLS_MODEL_GLOBAL_DYNAMIC
;
4751 else if (!strcmp (TREE_STRING_POINTER (attr
), "global-dynamic"))
4752 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
4758 is_local
= (*targetm
.binds_local_p
) (decl
);
4762 kind
= TLS_MODEL_LOCAL_EXEC
;
4764 kind
= TLS_MODEL_INITIAL_EXEC
;
4766 /* Local dynamic is inefficient when we're not combining the
4767 parts of the address. */
4768 else if (optimize
&& is_local
)
4769 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
4771 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
4772 if (kind
< flag_tls_default
)
4773 kind
= flag_tls_default
;
4778 /* Select a set of attributes for section NAME based on the properties
4779 of DECL and whether or not RELOC indicates that DECL's initializer
4780 might contain runtime relocations.
4782 We make the section read-only and executable for a function decl,
4783 read-only for a const data decl, and writable for a non-const data decl. */
4786 default_section_type_flags (decl
, name
, reloc
)
4791 return default_section_type_flags_1 (decl
, name
, reloc
, flag_pic
);
4795 default_section_type_flags_1 (decl
, name
, reloc
, shlib
)
4803 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
4804 flags
= SECTION_CODE
;
4805 else if (decl
&& decl_readonly_section_1 (decl
, reloc
, shlib
))
4808 flags
= SECTION_WRITE
;
4810 if (decl
&& DECL_ONE_ONLY (decl
))
4811 flags
|= SECTION_LINKONCE
;
4813 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL (decl
))
4814 flags
|= SECTION_TLS
| SECTION_WRITE
;
4816 if (strcmp (name
, ".bss") == 0
4817 || strncmp (name
, ".bss.", 5) == 0
4818 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
4819 || strcmp (name
, ".sbss") == 0
4820 || strncmp (name
, ".sbss.", 6) == 0
4821 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0
4822 || strcmp (name
, ".tbss") == 0
4823 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
4824 flags
|= SECTION_BSS
;
4826 if (strcmp (name
, ".tdata") == 0
4827 || strcmp (name
, ".tbss") == 0
4828 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0
4829 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
4830 flags
|= SECTION_TLS
;
4832 /* These three sections have special ELF types. They are neither
4833 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
4834 want to print a section type (@progbits or @nobits). If someone
4835 is silly enough to emit code or TLS variables to one of these
4836 sections, then don't handle them specially. */
4837 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
4838 && (strcmp (name
, ".init_array") == 0
4839 || strcmp (name
, ".fini_array") == 0
4840 || strcmp (name
, ".preinit_array") == 0))
4841 flags
|= SECTION_NOTYPE
;
4846 /* Output assembly to switch to section NAME with attribute FLAGS.
4847 Four variants for common object file formats. */
4850 default_no_named_section (name
, flags
)
4851 const char *name ATTRIBUTE_UNUSED
;
4852 unsigned int flags ATTRIBUTE_UNUSED
;
4854 /* Some object formats don't support named sections at all. The
4855 front-end should already have flagged this as an error. */
4860 default_elf_asm_named_section (name
, flags
)
4864 char flagchars
[10], *f
= flagchars
;
4866 if (! named_section_first_declaration (name
))
4868 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
4872 if (!(flags
& SECTION_DEBUG
))
4874 if (flags
& SECTION_WRITE
)
4876 if (flags
& SECTION_CODE
)
4878 if (flags
& SECTION_SMALL
)
4880 if (flags
& SECTION_MERGE
)
4882 if (flags
& SECTION_STRINGS
)
4884 if (flags
& SECTION_TLS
)
4888 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
4890 if (!(flags
& SECTION_NOTYPE
))
4894 if (flags
& SECTION_BSS
)
4899 fprintf (asm_out_file
, ",@%s", type
);
4901 if (flags
& SECTION_ENTSIZE
)
4902 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
4905 putc ('\n', asm_out_file
);
4909 default_coff_asm_named_section (name
, flags
)
4913 char flagchars
[8], *f
= flagchars
;
4915 if (flags
& SECTION_WRITE
)
4917 if (flags
& SECTION_CODE
)
4921 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
4925 default_pe_asm_named_section (name
, flags
)
4929 default_coff_asm_named_section (name
, flags
);
4931 if (flags
& SECTION_LINKONCE
)
4933 /* Functions may have been compiled at various levels of
4934 optimization so we can't use `same_size' here.
4935 Instead, have the linker pick one. */
4936 fprintf (asm_out_file
, "\t.linkonce %s\n",
4937 (flags
& SECTION_CODE
? "discard" : "same_size"));
4941 /* Used for vtable gc in GNU binutils. Record that the pointer at OFFSET
4942 from SYMBOL is used in all classes derived from SYMBOL. */
4945 assemble_vtable_entry (symbol
, offset
)
4947 HOST_WIDE_INT offset
;
4949 fputs ("\t.vtable_entry ", asm_out_file
);
4950 output_addr_const (asm_out_file
, symbol
);
4951 fputs (", ", asm_out_file
);
4952 fprintf (asm_out_file
, HOST_WIDE_INT_PRINT_DEC
, offset
);
4953 fputc ('\n', asm_out_file
);
4956 /* Used for vtable gc in GNU binutils. Record the class hierarchy by noting
4957 that the vtable symbol CHILD is derived from the vtable symbol PARENT. */
4960 assemble_vtable_inherit (child
, parent
)
4963 fputs ("\t.vtable_inherit ", asm_out_file
);
4964 output_addr_const (asm_out_file
, child
);
4965 fputs (", ", asm_out_file
);
4966 output_addr_const (asm_out_file
, parent
);
4967 fputc ('\n', asm_out_file
);
4970 /* The lame default section selector. */
4973 default_select_section (decl
, reloc
, align
)
4976 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
;
4978 bool readonly
= false;
4982 if (decl_readonly_section (decl
, reloc
))
4985 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
4987 if (! ((flag_pic
&& reloc
)
4988 || !TREE_READONLY (decl
)
4989 || TREE_SIDE_EFFECTS (decl
)
4990 || !TREE_CONSTANT (decl
)))
4993 else if (TREE_CODE (decl
) == STRING_CST
)
4994 readonly
= !flag_writable_strings
;
4995 else if (! (flag_pic
&& reloc
))
4999 readonly_data_section ();
5004 /* A helper function for default_elf_select_section and
5005 default_elf_unique_section. Categorizes the DECL. */
5007 enum section_category
5012 SECCAT_RODATA_MERGE_STR
,
5013 SECCAT_RODATA_MERGE_STR_INIT
,
5014 SECCAT_RODATA_MERGE_CONST
,
5019 /* To optimize loading of shared programs, define following subsections
5021 _REL Contains data that has relocations, so they get grouped
5022 together and dynamic linker will visit fewer pages in memory.
5023 _RO Contains data that is otherwise read-only. This is useful
5024 with prelinking as most relocations won't be dynamically
5025 linked and thus stay read only.
5026 _LOCAL Marks data containing relocations only to local objects.
5027 These relocations will get fully resolved by prelinking. */
5029 SECCAT_DATA_REL_LOCAL
,
5031 SECCAT_DATA_REL_RO_LOCAL
,
5041 static enum section_category
5042 categorize_decl_for_section
PARAMS ((tree
, int, int));
5044 static enum section_category
5045 categorize_decl_for_section (decl
, reloc
, shlib
)
5050 enum section_category ret
;
5052 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5054 else if (TREE_CODE (decl
) == STRING_CST
)
5056 if (flag_writable_strings
)
5059 return SECCAT_RODATA_MERGE_STR
;
5061 else if (TREE_CODE (decl
) == VAR_DECL
)
5063 if (DECL_INITIAL (decl
) == NULL
5064 || DECL_INITIAL (decl
) == error_mark_node
)
5066 else if (! TREE_READONLY (decl
)
5067 || TREE_SIDE_EFFECTS (decl
)
5068 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
5070 if (shlib
&& (reloc
& 2))
5071 ret
= SECCAT_DATA_REL
;
5072 else if (shlib
&& reloc
)
5073 ret
= SECCAT_DATA_REL_LOCAL
;
5077 else if (shlib
&& (reloc
& 2))
5078 ret
= SECCAT_DATA_REL_RO
;
5079 else if (shlib
&& reloc
)
5080 ret
= SECCAT_DATA_REL_RO_LOCAL
;
5081 else if (reloc
|| flag_merge_constants
< 2)
5082 /* C and C++ don't allow different variables to share the same
5083 location. -fmerge-all-constants allows even that (at the
5084 expense of not conforming). */
5085 ret
= SECCAT_RODATA
;
5086 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
5087 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
5089 ret
= SECCAT_RODATA_MERGE_CONST
;
5091 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
5093 if ((shlib
&& reloc
)
5094 || TREE_SIDE_EFFECTS (decl
)
5095 || ! TREE_CONSTANT (decl
))
5098 ret
= SECCAT_RODATA
;
5101 ret
= SECCAT_RODATA
;
5103 /* There are no read-only thread-local sections. */
5104 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL (decl
))
5106 if (ret
== SECCAT_BSS
)
5112 /* If the target uses small data sections, select it. */
5113 else if ((*targetm
.in_small_data_p
) (decl
))
5115 if (ret
== SECCAT_BSS
)
5117 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
5118 ret
= SECCAT_SRODATA
;
5127 decl_readonly_section (decl
, reloc
)
5131 return decl_readonly_section_1 (decl
, reloc
, flag_pic
);
5135 decl_readonly_section_1 (decl
, reloc
, shlib
)
5140 switch (categorize_decl_for_section (decl
, reloc
, shlib
))
5143 case SECCAT_RODATA_MERGE_STR
:
5144 case SECCAT_RODATA_MERGE_STR_INIT
:
5145 case SECCAT_RODATA_MERGE_CONST
:
5146 case SECCAT_SRODATA
:
5155 /* Select a section based on the above categorization. */
5158 default_elf_select_section (decl
, reloc
, align
)
5161 unsigned HOST_WIDE_INT align
;
5163 default_elf_select_section_1 (decl
, reloc
, align
, flag_pic
);
5167 default_elf_select_section_1 (decl
, reloc
, align
, shlib
)
5170 unsigned HOST_WIDE_INT align
;
5173 switch (categorize_decl_for_section (decl
, reloc
, shlib
))
5176 /* We're not supposed to be called on FUNCTION_DECLs. */
5179 readonly_data_section ();
5181 case SECCAT_RODATA_MERGE_STR
:
5182 mergeable_string_section (decl
, align
, 0);
5184 case SECCAT_RODATA_MERGE_STR_INIT
:
5185 mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
5187 case SECCAT_RODATA_MERGE_CONST
:
5188 mergeable_constant_section (DECL_MODE (decl
), align
, 0);
5190 case SECCAT_SRODATA
:
5191 named_section (NULL_TREE
, ".sdata2", reloc
);
5196 case SECCAT_DATA_REL
:
5197 named_section (NULL_TREE
, ".data.rel", reloc
);
5199 case SECCAT_DATA_REL_LOCAL
:
5200 named_section (NULL_TREE
, ".data.rel.local", reloc
);
5202 case SECCAT_DATA_REL_RO
:
5203 named_section (NULL_TREE
, ".data.rel.ro", reloc
);
5205 case SECCAT_DATA_REL_RO_LOCAL
:
5206 named_section (NULL_TREE
, ".data.rel.ro.local", reloc
);
5209 named_section (NULL_TREE
, ".sdata", reloc
);
5212 named_section (NULL_TREE
, ".tdata", reloc
);
5215 #ifdef BSS_SECTION_ASM_OP
5218 named_section (NULL_TREE
, ".bss", reloc
);
5222 named_section (NULL_TREE
, ".sbss", reloc
);
5225 named_section (NULL_TREE
, ".tbss", reloc
);
5232 /* Construct a unique section name based on the decl name and the
5233 categorization performed above. */
5236 default_unique_section (decl
, reloc
)
5240 default_unique_section_1 (decl
, reloc
, flag_pic
);
5244 default_unique_section_1 (decl
, reloc
, shlib
)
5249 bool one_only
= DECL_ONE_ONLY (decl
);
5250 const char *prefix
, *name
;
5254 switch (categorize_decl_for_section (decl
, reloc
, shlib
))
5257 prefix
= one_only
? ".gnu.linkonce.t." : ".text.";
5260 case SECCAT_RODATA_MERGE_STR
:
5261 case SECCAT_RODATA_MERGE_STR_INIT
:
5262 case SECCAT_RODATA_MERGE_CONST
:
5263 prefix
= one_only
? ".gnu.linkonce.r." : ".rodata.";
5265 case SECCAT_SRODATA
:
5266 prefix
= one_only
? ".gnu.linkonce.s2." : ".sdata2.";
5269 case SECCAT_DATA_REL
:
5270 case SECCAT_DATA_REL_LOCAL
:
5271 case SECCAT_DATA_REL_RO
:
5272 case SECCAT_DATA_REL_RO_LOCAL
:
5273 prefix
= one_only
? ".gnu.linkonce.d." : ".data.";
5276 prefix
= one_only
? ".gnu.linkonce.s." : ".sdata.";
5279 prefix
= one_only
? ".gnu.linkonce.b." : ".bss.";
5282 prefix
= one_only
? ".gnu.linkonce.sb." : ".sbss.";
5285 prefix
= one_only
? ".gnu.linkonce.td." : ".tdata.";
5288 prefix
= one_only
? ".gnu.linkonce.tb." : ".tbss.";
5293 plen
= strlen (prefix
);
5295 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5296 name
= (* targetm
.strip_name_encoding
) (name
);
5297 nlen
= strlen (name
);
5299 string
= alloca (nlen
+ plen
+ 1);
5300 memcpy (string
, prefix
, plen
);
5301 memcpy (string
+ plen
, name
, nlen
+ 1);
5303 DECL_SECTION_NAME (decl
) = build_string (nlen
+ plen
, string
);
5307 default_select_rtx_section (mode
, x
, align
)
5308 enum machine_mode mode ATTRIBUTE_UNUSED
;
5310 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
;
5313 switch (GET_CODE (x
))
5325 readonly_data_section ();
5329 default_elf_select_rtx_section (mode
, x
, align
)
5330 enum machine_mode mode
;
5332 unsigned HOST_WIDE_INT align
;
5334 /* ??? Handle small data here somehow. */
5337 switch (GET_CODE (x
))
5341 named_section (NULL_TREE
, ".data.rel.ro", 3);
5345 named_section (NULL_TREE
, ".data.rel.ro.local", 1);
5352 mergeable_constant_section (mode
, align
, 0);
5355 /* By default, we do nothing for encode_section_info, so we need not
5356 do anything but discard the '*' marker. */
5359 default_strip_name_encoding (str
)
5362 return str
+ (*str
== '*');
5365 /* Assume ELF-ish defaults, since that's pretty much the most liberal
5366 wrt cross-module name binding. */
5369 default_binds_local_p (exp
)
5372 return default_binds_local_p_1 (exp
, flag_pic
);
5376 default_binds_local_p_1 (exp
, shlib
)
5382 /* A non-decl is an entry in the constant pool. */
5385 /* Static variables are always local. */
5386 else if (! TREE_PUBLIC (exp
))
5388 /* A variable is local if the user tells us so. */
5389 else if (MODULE_LOCAL_P (exp
))
5391 /* Otherwise, variables defined outside this object may not be local. */
5392 else if (DECL_EXTERNAL (exp
))
5394 /* Linkonce and weak data are never local. */
5395 else if (DECL_ONE_ONLY (exp
) || DECL_WEAK (exp
))
5397 /* If PIC, then assume that any global name can be overridden by
5398 symbols resolved from other modules. */
5401 /* Uninitialized COMMON variable may be unified with symbols
5402 resolved from other modules. */
5403 else if (DECL_COMMON (exp
)
5404 && (DECL_INITIAL (exp
) == NULL
5405 || DECL_INITIAL (exp
) == error_mark_node
))
5407 /* Otherwise we're left with initialized (or non-common) global data
5408 which is of necessity defined locally. */
5415 /* Default function to output code that will globalize a label. A
5416 target must define GLOBAL_ASM_OP or provide it's own function to
5417 globalize a label. */
5418 #ifdef GLOBAL_ASM_OP
5420 default_globalize_label (stream
, name
)
5424 fputs (GLOBAL_ASM_OP
, stream
);
5425 assemble_name (stream
, name
);
5426 putc ('\n', stream
);
5428 #endif /* GLOBAL_ASM_OP */
5430 #include "gt-varasm.h"