1 /* Functions for generic Darwin as target machine for GNU C compiler.
2 Copyright (C) 1989-2013 Free Software Foundation, Inc.
3 Contributed by Apple Computer Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
23 #include "coretypes.h"
27 #include "hard-reg-set.h"
28 #include "insn-config.h"
29 #include "conditions.h"
30 #include "insn-flags.h"
32 #include "insn-attr.h"
35 #include "stringpool.h"
37 #include "stor-layout.h"
42 #include "langhooks.h"
45 #include "diagnostic-core.h"
53 #include "lto-streamer.h"
55 /* Darwin supports a feature called fix-and-continue, which is used
56 for rapid turn around debugging. When code is compiled with the
57 -mfix-and-continue flag, two changes are made to the generated code
58 that allow the system to do things that it would normally not be
59 able to do easily. These changes allow gdb to load in
60 recompilation of a translation unit that has been changed into a
61 running program and replace existing functions and methods of that
62 translation unit with versions of those functions and methods
63 from the newly compiled translation unit. The new functions access
64 the existing static symbols from the old translation unit, if the
65 symbol existed in the unit to be replaced, and from the new
66 translation unit, otherwise.
68 The changes are to insert 5 nops at the beginning of all functions
69 and to use indirection to get at static symbols. The 5 nops
70 are required by consumers of the generated code. Currently, gdb
71 uses this to patch in a jump to the overriding function, this
72 allows all uses of the old name to forward to the replacement,
73 including existing function pointers and virtual methods. See
74 rs6000_emit_prologue for the code that handles the nop insertions.
76 The added indirection allows gdb to redirect accesses to static
77 symbols from the newly loaded translation unit to the existing
78 symbol, if any. @code{static} symbols are special and are handled by
79 setting the second word in the .non_lazy_symbol_pointer data
80 structure to symbol. See indirect_data for the code that handles
81 the extra indirection, and machopic_output_indirection and its use
82 of MACHO_SYMBOL_STATIC for the code that handles @code{static}
83 symbol indirection. */
85 /* For darwin >= 9 (OSX 10.5) the linker is capable of making the necessary
86 branch islands and we no longer need to emit darwin stubs.
87 However, if we are generating code for earlier systems (or for use in the
88 kernel) the stubs might still be required, and this will be set true. */
89 int darwin_emit_branch_islands
= false;
91 typedef struct GTY(()) cdtor_record
{
93 int priority
; /* [con/de]structor priority */
94 int position
; /* original position */
97 static GTY(()) vec
<cdtor_record
, va_gc
> *ctors
= NULL
;
98 static GTY(()) vec
<cdtor_record
, va_gc
> *dtors
= NULL
;
100 /* A flag to determine whether we are running c++ or obj-c++. This has to be
101 settable from non-c-family contexts too (i.e. we can't use the c_dialect_
103 int darwin_running_cxx
;
105 /* Some code-gen now depends on OS major version numbers (at least). */
106 int generating_for_darwin_version
;
109 section
* darwin_sections
[NUM_DARWIN_SECTIONS
];
111 /* While we transition to using in-tests instead of ifdef'd code. */
113 #define HAVE_lo_sum 0
114 #define gen_macho_high(a,b) (a)
115 #define gen_macho_low(a,b,c) (a)
118 /* True if we're setting __attribute__ ((ms_struct)). */
119 int darwin_ms_struct
= false;
121 /* Earlier versions of Darwin as do not recognize an alignment field in
122 .comm directives, this should be set for versions that allow it. */
123 int emit_aligned_common
= false;
125 /* A get_unnamed_section callback used to switch to an ObjC section.
126 DIRECTIVE is as for output_section_asm_op. */
129 output_objc_section_asm_op (const void *directive
)
131 static bool been_here
= false;
133 /* The NeXT ObjC Runtime requires these sections to be present and in
134 order in the object. The code below implements this by emitting
135 a section header for each ObjC section the first time that an ObjC
136 section is requested. */
139 section
*saved_in_section
= in_section
;
140 static const enum darwin_section_enum tomark
[] =
142 /* written, cold -> hot */
143 objc_cat_cls_meth_section
,
144 objc_cat_inst_meth_section
,
145 objc_string_object_section
,
146 objc_constant_string_object_section
,
147 objc_selector_refs_section
,
148 objc_selector_fixup_section
,
149 objc_cls_refs_section
,
151 objc_meta_class_section
,
152 /* shared, hot -> cold */
153 objc_cls_meth_section
,
154 objc_inst_meth_section
,
155 objc_protocol_section
,
156 objc_class_names_section
,
157 objc_meth_var_types_section
,
158 objc_meth_var_names_section
,
159 objc_category_section
,
160 objc_class_vars_section
,
161 objc_instance_vars_section
,
162 objc_module_info_section
,
163 objc_symbols_section
,
166 static const enum darwin_section_enum tomarkv1
[] =
168 objc1_protocol_ext_section
,
169 objc1_class_ext_section
,
170 objc1_prop_list_section
173 static const enum darwin_section_enum tomarkv2
[] =
175 objc2_message_refs_section
,
176 objc2_classdefs_section
,
177 objc2_metadata_section
,
178 objc2_classrefs_section
,
179 objc2_classlist_section
,
180 objc2_categorylist_section
,
181 objc2_selector_refs_section
,
182 objc2_nonlazy_class_section
,
183 objc2_nonlazy_category_section
,
184 objc2_protocollist_section
,
185 objc2_protocolrefs_section
,
186 objc2_super_classrefs_section
,
187 objc2_image_info_section
,
188 objc2_constant_string_object_section
193 if (flag_objc_abi
< 2)
195 for (i
= 0; i
< ARRAY_SIZE (tomark
); i
++)
196 switch_to_section (darwin_sections
[tomark
[i
]]);
197 if (flag_objc_abi
== 1)
198 for (i
= 0; i
< ARRAY_SIZE (tomarkv1
); i
++)
199 switch_to_section (darwin_sections
[tomarkv1
[i
]]);
202 for (i
= 0; i
< ARRAY_SIZE (tomarkv2
); i
++)
203 switch_to_section (darwin_sections
[tomarkv2
[i
]]);
204 /* Make sure we don't get varasm.c out of sync with us. */
205 switch_to_section (saved_in_section
);
207 output_section_asm_op (directive
);
211 /* Private flag applied to disable section-anchors in a particular section. */
212 #define SECTION_NO_ANCHOR SECTION_MACH_DEP
215 /* Implement TARGET_ASM_INIT_SECTIONS. */
218 darwin_init_sections (void)
220 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) \
221 darwin_sections[NAME] = \
222 get_unnamed_section (FLAGS, (OBJC \
223 ? output_objc_section_asm_op \
224 : output_section_asm_op), \
226 #include "config/darwin-sections.def"
229 readonly_data_section
= darwin_sections
[const_section
];
230 exception_section
= darwin_sections
[darwin_exception_section
];
231 eh_frame_section
= darwin_sections
[darwin_eh_frame_section
];
235 name_needs_quotes (const char *name
)
238 while ((c
= *name
++) != '\0')
240 && c
!= '.' && c
!= '$' && c
!= '_' )
245 /* Return true if SYM_REF can be used without an indirection. */
247 machopic_symbol_defined_p (rtx sym_ref
)
249 if (SYMBOL_REF_FLAGS (sym_ref
) & MACHO_SYMBOL_FLAG_DEFINED
)
252 /* If a symbol references local and is not an extern to this
253 file, then the symbol might be able to declared as defined. */
254 if (SYMBOL_REF_LOCAL_P (sym_ref
) && ! SYMBOL_REF_EXTERNAL_P (sym_ref
))
256 /* If the symbol references a variable and the variable is a
257 common symbol, then this symbol is not defined. */
258 if (SYMBOL_REF_FLAGS (sym_ref
) & MACHO_SYMBOL_FLAG_VARIABLE
)
260 tree decl
= SYMBOL_REF_DECL (sym_ref
);
263 if (DECL_COMMON (decl
))
271 /* This module assumes that (const (symbol_ref "foo")) is a legal pic
272 reference, which will not be changed. */
274 enum machopic_addr_class
275 machopic_classify_symbol (rtx sym_ref
)
279 function_p
= SYMBOL_REF_FUNCTION_P (sym_ref
);
280 if (machopic_symbol_defined_p (sym_ref
))
282 ? MACHOPIC_DEFINED_FUNCTION
: MACHOPIC_DEFINED_DATA
);
285 ? MACHOPIC_UNDEFINED_FUNCTION
: MACHOPIC_UNDEFINED_DATA
);
288 #ifndef TARGET_FIX_AND_CONTINUE
289 #define TARGET_FIX_AND_CONTINUE 0
292 /* Indicate when fix-and-continue style code generation is being used
293 and when a reference to data should be indirected so that it can be
294 rebound in a new translation unit to reference the original instance
295 of that data. Symbol names that are for code generation local to
296 the translation unit are bound to the new translation unit;
297 currently this means symbols that begin with L or _OBJC_;
298 otherwise, we indicate that an indirect reference should be made to
299 permit the runtime to rebind new instances of the translation unit
300 to the original instance of the data. */
303 indirect_data (rtx sym_ref
)
308 /* If we aren't generating fix-and-continue code, don't do anything
310 if (TARGET_FIX_AND_CONTINUE
== 0)
313 /* Otherwise, all symbol except symbols that begin with L or _OBJC_
314 are indirected. Symbols that begin with L and _OBJC_ are always
315 bound to the current translation unit as they are used for
316 generated local data of the translation unit. */
318 name
= XSTR (sym_ref
, 0);
320 lprefix
= (((name
[0] == '*' || name
[0] == '&')
321 && (name
[1] == 'L' || (name
[1] == '"' && name
[2] == 'L')))
322 || (strncmp (name
, "_OBJC_", 6) == 0));
328 machopic_data_defined_p (rtx sym_ref
)
330 if (indirect_data (sym_ref
))
333 switch (machopic_classify_symbol (sym_ref
))
335 case MACHOPIC_DEFINED_DATA
:
336 case MACHOPIC_DEFINED_FUNCTION
:
344 machopic_define_symbol (rtx mem
)
348 gcc_assert (GET_CODE (mem
) == MEM
);
349 sym_ref
= XEXP (mem
, 0);
350 SYMBOL_REF_FLAGS (sym_ref
) |= MACHO_SYMBOL_FLAG_DEFINED
;
353 /* Return either ORIG or:
355 (const:P (unspec:P [ORIG] UNSPEC_MACHOPIC_OFFSET))
357 depending on MACHO_DYNAMIC_NO_PIC_P. */
359 machopic_gen_offset (rtx orig
)
361 if (MACHO_DYNAMIC_NO_PIC_P
)
365 /* Play games to avoid marking the function as needing pic if we
366 are being called as part of the cost-estimation process. */
367 if (current_ir_type () != IR_GIMPLE
|| currently_expanding_to_rtl
)
368 crtl
->uses_pic_offset_table
= 1;
369 orig
= gen_rtx_UNSPEC (Pmode
, gen_rtvec (1, orig
),
370 UNSPEC_MACHOPIC_OFFSET
);
371 return gen_rtx_CONST (Pmode
, orig
);
375 static GTY(()) const char * function_base_func_name
;
376 static GTY(()) int current_pic_label_num
;
377 static GTY(()) int emitted_pic_label_num
;
380 update_pic_label_number_if_needed (void)
382 const char *current_name
;
384 /* When we are generating _get_pc thunks within stubs, there is no current
386 if (current_function_decl
)
389 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl
));
390 if (function_base_func_name
!= current_name
)
392 ++current_pic_label_num
;
393 function_base_func_name
= current_name
;
398 ++current_pic_label_num
;
399 function_base_func_name
= "L_machopic_stub_dummy";
404 machopic_output_function_base_name (FILE *file
)
406 /* If dynamic-no-pic is on, we should not get here. */
407 gcc_assert (!MACHO_DYNAMIC_NO_PIC_P
);
409 update_pic_label_number_if_needed ();
410 fprintf (file
, "L%d$pb", current_pic_label_num
);
413 char curr_picbasename
[32];
416 machopic_get_function_picbase (void)
418 /* If dynamic-no-pic is on, we should not get here. */
419 gcc_assert (!MACHO_DYNAMIC_NO_PIC_P
);
421 update_pic_label_number_if_needed ();
422 snprintf (curr_picbasename
, 32, "L%d$pb", current_pic_label_num
);
423 return (const char *) curr_picbasename
;
427 machopic_should_output_picbase_label (void)
429 update_pic_label_number_if_needed ();
431 if (current_pic_label_num
== emitted_pic_label_num
)
434 emitted_pic_label_num
= current_pic_label_num
;
438 /* The suffix attached to non-lazy pointer symbols. */
439 #define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr"
440 /* The suffix attached to stub symbols. */
441 #define STUB_SUFFIX "$stub"
443 typedef struct GTY (()) machopic_indirection
445 /* The SYMBOL_REF for the entity referenced. */
447 /* The name of the stub or non-lazy pointer. */
448 const char * ptr_name
;
449 /* True iff this entry is for a stub (as opposed to a non-lazy
452 /* True iff this stub or pointer pointer has been referenced. */
454 } machopic_indirection
;
456 /* A table mapping stub names and non-lazy pointer names to
457 SYMBOL_REFs for the stubbed-to and pointed-to entities. */
459 static GTY ((param_is (struct machopic_indirection
))) htab_t
460 machopic_indirections
;
462 /* Return a hash value for a SLOT in the indirections hash table. */
465 machopic_indirection_hash (const void *slot
)
467 const machopic_indirection
*p
= (const machopic_indirection
*) slot
;
468 return htab_hash_string (p
->ptr_name
);
471 /* Returns true if the KEY is the same as that associated with
475 machopic_indirection_eq (const void *slot
, const void *key
)
477 return strcmp (((const machopic_indirection
*) slot
)->ptr_name
,
478 (const char *) key
) == 0;
481 /* Return the name of the non-lazy pointer (if STUB_P is false) or
482 stub (if STUB_B is true) corresponding to the given name. */
485 machopic_indirection_name (rtx sym_ref
, bool stub_p
)
488 const char *name
= XSTR (sym_ref
, 0);
489 size_t namelen
= strlen (name
);
490 machopic_indirection
*p
;
494 const char *prefix
= user_label_prefix
;
495 const char *quote
= "";
498 id
= maybe_get_identifier (name
);
503 while (IDENTIFIER_TRANSPARENT_ALIAS (id
))
504 id
= TREE_CHAIN (id
);
507 name
= IDENTIFIER_POINTER (id
);
508 namelen
= strlen (name
);
519 needs_quotes
= name_needs_quotes (name
);
526 suffix
= STUB_SUFFIX
;
528 suffix
= NON_LAZY_POINTER_SUFFIX
;
530 buffer
= XALLOCAVEC (char, strlen ("&L")
537 /* Construct the name of the non-lazy pointer or stub. */
538 sprintf (buffer
, "&%sL%s%s%s%s", quote
, prefix
, name
, suffix
, quote
);
540 if (!machopic_indirections
)
541 machopic_indirections
= htab_create_ggc (37,
542 machopic_indirection_hash
,
543 machopic_indirection_eq
,
546 slot
= htab_find_slot_with_hash (machopic_indirections
, buffer
,
547 htab_hash_string (buffer
), INSERT
);
550 p
= (machopic_indirection
*) *slot
;
554 p
= ggc_alloc_machopic_indirection ();
556 p
->ptr_name
= xstrdup (buffer
);
565 /* Return the name of the stub for the mcount function. */
568 machopic_mcount_stub_name (void)
570 rtx symbol
= gen_rtx_SYMBOL_REF (Pmode
, "*mcount");
571 return machopic_indirection_name (symbol
, /*stub_p=*/true);
574 /* If NAME is the name of a stub or a non-lazy pointer , mark the stub
575 or non-lazy pointer as used -- and mark the object to which the
576 pointer/stub refers as used as well, since the pointer/stub will
577 emit a reference to it. */
580 machopic_validate_stub_or_non_lazy_ptr (const char *name
)
582 machopic_indirection
*p
;
584 p
= ((machopic_indirection
*)
585 (htab_find_with_hash (machopic_indirections
, name
,
586 htab_hash_string (name
))));
589 const char *real_name
;
594 /* Do what output_addr_const will do when we actually call it. */
595 if (SYMBOL_REF_DECL (p
->symbol
))
596 mark_decl_referenced (SYMBOL_REF_DECL (p
->symbol
));
598 real_name
= targetm
.strip_name_encoding (XSTR (p
->symbol
, 0));
600 id
= maybe_get_identifier (real_name
);
602 mark_referenced (id
);
606 /* Transform ORIG, which may be any data source, to the corresponding
607 source using indirections. */
610 machopic_indirect_data_reference (rtx orig
, rtx reg
)
614 if (! MACHOPIC_INDIRECT
)
617 if (GET_CODE (orig
) == SYMBOL_REF
)
619 int defined
= machopic_data_defined_p (orig
);
621 if (defined
&& MACHO_DYNAMIC_NO_PIC_P
)
625 /* Create a new register for CSE opportunities. */
626 rtx hi_reg
= (!can_create_pseudo_p () ? reg
: gen_reg_rtx (Pmode
));
627 emit_insn (gen_macho_high (hi_reg
, orig
));
628 emit_insn (gen_macho_low (reg
, hi_reg
, orig
));
634 /* some other cpu -- writeme! */
640 if (DARWIN_PPC
|| HAVE_lo_sum
)
641 offset
= machopic_gen_offset (orig
);
645 rtx hi_sum_reg
= (!can_create_pseudo_p ()
647 : gen_reg_rtx (Pmode
));
651 emit_insn (gen_rtx_SET (Pmode
, hi_sum_reg
,
652 gen_rtx_PLUS (Pmode
, pic_offset_table_rtx
,
653 gen_rtx_HIGH (Pmode
, offset
))));
654 emit_insn (gen_rtx_SET (Pmode
, reg
,
655 gen_rtx_LO_SUM (Pmode
, hi_sum_reg
,
656 copy_rtx (offset
))));
660 else if (HAVE_lo_sum
)
664 emit_insn (gen_rtx_SET (VOIDmode
, reg
,
665 gen_rtx_HIGH (Pmode
, offset
)));
666 emit_insn (gen_rtx_SET (VOIDmode
, reg
,
667 gen_rtx_LO_SUM (Pmode
, reg
,
668 copy_rtx (offset
))));
669 emit_use (pic_offset_table_rtx
);
671 orig
= gen_rtx_PLUS (Pmode
, pic_offset_table_rtx
, reg
);
676 ptr_ref
= (gen_rtx_SYMBOL_REF
678 machopic_indirection_name (orig
, /*stub_p=*/false)));
680 SYMBOL_REF_DATA (ptr_ref
) = SYMBOL_REF_DATA (orig
);
682 ptr_ref
= gen_const_mem (Pmode
, ptr_ref
);
683 machopic_define_symbol (ptr_ref
);
687 && MACHO_DYNAMIC_NO_PIC_P
)
689 emit_insn (gen_rtx_SET (Pmode
, reg
, ptr_ref
));
695 else if (GET_CODE (orig
) == CONST
)
697 /* If "(const (plus ...", walk the PLUS and return that result.
698 PLUS processing (below) will restore the "(const ..." if
700 if (GET_CODE (XEXP (orig
, 0)) == PLUS
)
701 return machopic_indirect_data_reference (XEXP (orig
, 0), reg
);
705 else if (GET_CODE (orig
) == MEM
)
708 machopic_indirect_data_reference (XEXP (orig
, 0), reg
);
711 else if (GET_CODE (orig
) == PLUS
)
714 /* When the target is i386, this code prevents crashes due to the
715 compiler's ignorance on how to move the PIC base register to
716 other registers. (The reload phase sometimes introduces such
718 if (GET_CODE (XEXP (orig
, 0)) == REG
719 && REGNO (XEXP (orig
, 0)) == PIC_OFFSET_TABLE_REGNUM
720 /* Prevent the same register from being erroneously used
721 as both the base and index registers. */
722 && (DARWIN_X86
&& (GET_CODE (XEXP (orig
, 1)) == CONST
))
725 emit_move_insn (reg
, XEXP (orig
, 0));
726 XEXP (ptr_ref
, 0) = reg
;
730 /* Legitimize both operands of the PLUS. */
731 base
= machopic_indirect_data_reference (XEXP (orig
, 0), reg
);
732 orig
= machopic_indirect_data_reference (XEXP (orig
, 1),
733 (base
== reg
? 0 : reg
));
734 if (MACHOPIC_INDIRECT
&& (GET_CODE (orig
) == CONST_INT
))
735 result
= plus_constant (Pmode
, base
, INTVAL (orig
));
737 result
= gen_rtx_PLUS (Pmode
, base
, orig
);
739 if (MACHOPIC_JUST_INDIRECT
&& GET_CODE (base
) == MEM
)
743 emit_move_insn (reg
, result
);
748 result
= force_reg (GET_MODE (result
), result
);
757 /* Transform TARGET (a MEM), which is a function call target, to the
758 corresponding symbol_stub if necessary. Return a new MEM. */
761 machopic_indirect_call_target (rtx target
)
763 if (! darwin_emit_branch_islands
)
766 if (GET_CODE (target
) != MEM
)
769 if (MACHOPIC_INDIRECT
770 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
771 && !(SYMBOL_REF_FLAGS (XEXP (target
, 0))
772 & MACHO_SYMBOL_FLAG_DEFINED
))
774 rtx sym_ref
= XEXP (target
, 0);
775 const char *stub_name
= machopic_indirection_name (sym_ref
,
777 enum machine_mode mode
= GET_MODE (sym_ref
);
779 XEXP (target
, 0) = gen_rtx_SYMBOL_REF (mode
, stub_name
);
780 SYMBOL_REF_DATA (XEXP (target
, 0)) = SYMBOL_REF_DATA (sym_ref
);
781 MEM_READONLY_P (target
) = 1;
782 MEM_NOTRAP_P (target
) = 1;
789 machopic_legitimize_pic_address (rtx orig
, enum machine_mode mode
, rtx reg
)
793 if (! MACHOPIC_INDIRECT
)
796 /* First handle a simple SYMBOL_REF or LABEL_REF */
797 if (GET_CODE (orig
) == LABEL_REF
798 || (GET_CODE (orig
) == SYMBOL_REF
801 /* addr(foo) = &func+(foo-func) */
802 orig
= machopic_indirect_data_reference (orig
, reg
);
804 if (GET_CODE (orig
) == PLUS
805 && GET_CODE (XEXP (orig
, 0)) == REG
)
808 return force_reg (mode
, orig
);
810 emit_move_insn (reg
, orig
);
814 if (GET_CODE (orig
) == MEM
)
818 gcc_assert (!reload_in_progress
);
819 reg
= gen_reg_rtx (Pmode
);
823 if (MACHO_DYNAMIC_NO_PIC_P
824 && (GET_CODE (XEXP (orig
, 0)) == SYMBOL_REF
825 || GET_CODE (XEXP (orig
, 0)) == LABEL_REF
))
827 #if defined (TARGET_TOC) /* ppc */
828 rtx temp_reg
= (!can_create_pseudo_p ()
830 gen_reg_rtx (Pmode
));
831 rtx asym
= XEXP (orig
, 0);
834 emit_insn (gen_macho_high (temp_reg
, asym
));
835 mem
= gen_const_mem (GET_MODE (orig
),
836 gen_rtx_LO_SUM (Pmode
, temp_reg
,
838 emit_insn (gen_rtx_SET (VOIDmode
, reg
, mem
));
840 /* Some other CPU -- WriteMe! but right now there are no other
841 platforms that can use dynamic-no-pic */
847 if (GET_CODE (XEXP (orig
, 0)) == SYMBOL_REF
848 || GET_CODE (XEXP (orig
, 0)) == LABEL_REF
)
850 rtx offset
= machopic_gen_offset (XEXP (orig
, 0));
851 #if defined (TARGET_TOC) /* i.e., PowerPC */
852 /* Generating a new reg may expose opportunities for
853 common subexpression elimination. */
854 rtx hi_sum_reg
= (!can_create_pseudo_p ()
856 : gen_reg_rtx (Pmode
));
861 sum
= gen_rtx_HIGH (Pmode
, offset
);
862 if (! MACHO_DYNAMIC_NO_PIC_P
)
863 sum
= gen_rtx_PLUS (Pmode
, pic_offset_table_rtx
, sum
);
865 emit_insn (gen_rtx_SET (Pmode
, hi_sum_reg
, sum
));
867 mem
= gen_const_mem (GET_MODE (orig
),
868 gen_rtx_LO_SUM (Pmode
,
871 insn
= emit_insn (gen_rtx_SET (VOIDmode
, reg
, mem
));
872 set_unique_reg_note (insn
, REG_EQUAL
, pic_ref
);
876 emit_use (gen_rtx_REG (Pmode
, PIC_OFFSET_TABLE_REGNUM
));
878 emit_insn (gen_rtx_SET (VOIDmode
, reg
,
880 gen_rtx_CONST (Pmode
,
882 emit_insn (gen_rtx_SET (VOIDmode
, reg
,
883 gen_rtx_LO_SUM (Pmode
, reg
,
884 gen_rtx_CONST (Pmode
,
885 copy_rtx (offset
)))));
886 pic_ref
= gen_rtx_PLUS (Pmode
,
887 pic_offset_table_rtx
, reg
);
891 #endif /* HAVE_lo_sum */
893 rtx pic
= pic_offset_table_rtx
;
894 if (GET_CODE (pic
) != REG
)
896 emit_move_insn (reg
, pic
);
900 emit_use (gen_rtx_REG (Pmode
, PIC_OFFSET_TABLE_REGNUM
));
903 if (reload_in_progress
)
904 df_set_regs_ever_live (REGNO (pic
), true);
905 pic_ref
= gen_rtx_PLUS (Pmode
, pic
,
906 machopic_gen_offset (XEXP (orig
, 0)));
909 #if !defined (TARGET_TOC)
910 emit_move_insn (reg
, pic_ref
);
911 pic_ref
= gen_const_mem (GET_MODE (orig
), reg
);
918 if (GET_CODE (orig
) == SYMBOL_REF
919 || GET_CODE (orig
) == LABEL_REF
)
921 rtx offset
= machopic_gen_offset (orig
);
922 #if defined (TARGET_TOC) /* i.e., PowerPC */
927 gcc_assert (!reload_in_progress
);
928 reg
= gen_reg_rtx (Pmode
);
933 emit_insn (gen_rtx_SET (Pmode
, hi_sum_reg
,
934 (MACHO_DYNAMIC_NO_PIC_P
)
935 ? gen_rtx_HIGH (Pmode
, offset
)
936 : gen_rtx_PLUS (Pmode
,
937 pic_offset_table_rtx
,
940 emit_insn (gen_rtx_SET (VOIDmode
, reg
,
941 gen_rtx_LO_SUM (Pmode
,
943 copy_rtx (offset
))));
946 emit_insn (gen_rtx_SET (VOIDmode
, reg
,
947 gen_rtx_HIGH (Pmode
, offset
)));
948 emit_insn (gen_rtx_SET (VOIDmode
, reg
,
949 gen_rtx_LO_SUM (Pmode
, reg
,
950 copy_rtx (offset
))));
951 pic_ref
= gen_rtx_PLUS (Pmode
,
952 pic_offset_table_rtx
, reg
);
956 #endif /* HAVE_lo_sum */
959 || GET_CODE (orig
) == SUBREG
)
965 rtx pic
= pic_offset_table_rtx
;
966 if (GET_CODE (pic
) != REG
)
968 emit_move_insn (reg
, pic
);
972 emit_use (pic_offset_table_rtx
);
974 if (reload_in_progress
)
975 df_set_regs_ever_live (REGNO (pic
), true);
976 pic_ref
= gen_rtx_PLUS (Pmode
,
978 machopic_gen_offset (orig
));
983 if (GET_CODE (pic_ref
) != REG
)
987 emit_move_insn (reg
, pic_ref
);
992 return force_reg (mode
, pic_ref
);
1001 else if (GET_CODE (orig
) == SYMBOL_REF
)
1004 else if (GET_CODE (orig
) == PLUS
1005 && (GET_CODE (XEXP (orig
, 0)) == MEM
1006 || GET_CODE (XEXP (orig
, 0)) == SYMBOL_REF
1007 || GET_CODE (XEXP (orig
, 0)) == LABEL_REF
)
1008 && XEXP (orig
, 0) != pic_offset_table_rtx
1009 && GET_CODE (XEXP (orig
, 1)) != REG
)
1013 int is_complex
= (GET_CODE (XEXP (orig
, 0)) == MEM
);
1015 base
= machopic_legitimize_pic_address (XEXP (orig
, 0), Pmode
, reg
);
1016 orig
= machopic_legitimize_pic_address (XEXP (orig
, 1),
1017 Pmode
, (base
== reg
? 0 : reg
));
1018 if (GET_CODE (orig
) == CONST_INT
)
1020 pic_ref
= plus_constant (Pmode
, base
, INTVAL (orig
));
1024 pic_ref
= gen_rtx_PLUS (Pmode
, base
, orig
);
1026 if (reg
&& is_complex
)
1028 emit_move_insn (reg
, pic_ref
);
1031 /* Likewise, should we set special REG_NOTEs here? */
1034 else if (GET_CODE (orig
) == CONST
)
1036 return machopic_legitimize_pic_address (XEXP (orig
, 0), Pmode
, reg
);
1039 else if (GET_CODE (orig
) == MEM
1040 && GET_CODE (XEXP (orig
, 0)) == SYMBOL_REF
)
1042 rtx addr
= machopic_legitimize_pic_address (XEXP (orig
, 0), Pmode
, reg
);
1043 addr
= replace_equiv_address (orig
, addr
);
1044 emit_move_insn (reg
, addr
);
1051 /* Output the stub or non-lazy pointer in *SLOT, if it has been used.
1052 DATA is the FILE* for assembly output. Called from
1056 machopic_output_indirection (void **slot
, void *data
)
1058 machopic_indirection
*p
= *((machopic_indirection
**) slot
);
1059 FILE *asm_out_file
= (FILE *) data
;
1061 const char *sym_name
;
1062 const char *ptr_name
;
1068 sym_name
= XSTR (symbol
, 0);
1069 ptr_name
= p
->ptr_name
;
1077 id
= maybe_get_identifier (sym_name
);
1082 while (IDENTIFIER_TRANSPARENT_ALIAS (id
))
1083 id
= TREE_CHAIN (id
);
1085 sym_name
= IDENTIFIER_POINTER (id
);
1088 sym
= XALLOCAVEC (char, strlen (sym_name
) + 2);
1089 if (sym_name
[0] == '*' || sym_name
[0] == '&')
1090 strcpy (sym
, sym_name
+ 1);
1091 else if (sym_name
[0] == '-' || sym_name
[0] == '+')
1092 strcpy (sym
, sym_name
);
1094 sprintf (sym
, "%s%s", user_label_prefix
, sym_name
);
1096 stub
= XALLOCAVEC (char, strlen (ptr_name
) + 2);
1097 if (ptr_name
[0] == '*' || ptr_name
[0] == '&')
1098 strcpy (stub
, ptr_name
+ 1);
1100 sprintf (stub
, "%s%s", user_label_prefix
, ptr_name
);
1102 machopic_output_stub (asm_out_file
, sym
, stub
);
1104 else if (! indirect_data (symbol
)
1105 && (machopic_symbol_defined_p (symbol
)
1106 || SYMBOL_REF_LOCAL_P (symbol
)))
1108 switch_to_section (data_section
);
1109 assemble_align (GET_MODE_ALIGNMENT (Pmode
));
1110 assemble_label (asm_out_file
, ptr_name
);
1111 assemble_integer (gen_rtx_SYMBOL_REF (Pmode
, sym_name
),
1112 GET_MODE_SIZE (Pmode
),
1113 GET_MODE_ALIGNMENT (Pmode
), 1);
1117 rtx init
= const0_rtx
;
1119 switch_to_section (darwin_sections
[machopic_nl_symbol_ptr_section
]);
1121 /* Mach-O symbols are passed around in code through indirect
1122 references and the original symbol_ref hasn't passed through
1123 the generic handling and reference-catching in
1124 output_operand, so we need to manually mark weak references
1126 if (SYMBOL_REF_WEAK (symbol
))
1128 tree decl
= SYMBOL_REF_DECL (symbol
);
1129 gcc_assert (DECL_P (decl
));
1131 if (decl
!= NULL_TREE
1132 && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
)
1133 /* Handle only actual external-only definitions, not
1134 e.g. extern inline code or variables for which
1135 storage has been allocated. */
1136 && !TREE_STATIC (decl
))
1138 fputs ("\t.weak_reference ", asm_out_file
);
1139 assemble_name (asm_out_file
, sym_name
);
1140 fputc ('\n', asm_out_file
);
1144 assemble_name (asm_out_file
, ptr_name
);
1145 fprintf (asm_out_file
, ":\n");
1147 fprintf (asm_out_file
, "\t.indirect_symbol ");
1148 assemble_name (asm_out_file
, sym_name
);
1149 fprintf (asm_out_file
, "\n");
1151 /* Variables that are marked with MACHO_SYMBOL_STATIC need to
1152 have their symbol name instead of 0 in the second entry of
1153 the non-lazy symbol pointer data structure when they are
1154 defined. This allows the runtime to rebind newer instances
1155 of the translation unit with the original instance of the
1158 if ((SYMBOL_REF_FLAGS (symbol
) & MACHO_SYMBOL_STATIC
)
1159 && machopic_symbol_defined_p (symbol
))
1160 init
= gen_rtx_SYMBOL_REF (Pmode
, sym_name
);
1162 assemble_integer (init
, GET_MODE_SIZE (Pmode
),
1163 GET_MODE_ALIGNMENT (Pmode
), 1);
1170 machopic_finish (FILE *asm_out_file
)
1172 if (machopic_indirections
)
1173 htab_traverse_noresize (machopic_indirections
,
1174 machopic_output_indirection
,
1179 machopic_operand_p (rtx op
)
1181 if (MACHOPIC_JUST_INDIRECT
)
1182 return (GET_CODE (op
) == SYMBOL_REF
1183 && machopic_symbol_defined_p (op
));
1185 return (GET_CODE (op
) == CONST
1186 && GET_CODE (XEXP (op
, 0)) == UNSPEC
1187 && XINT (XEXP (op
, 0), 1) == UNSPEC_MACHOPIC_OFFSET
);
1190 /* This function records whether a given name corresponds to a defined
1191 or undefined function or variable, for machopic_classify_ident to
1195 darwin_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
1199 /* Do the standard encoding things first. */
1200 default_encode_section_info (decl
, rtl
, first
);
1202 if (TREE_CODE (decl
) != FUNCTION_DECL
&& TREE_CODE (decl
) != VAR_DECL
)
1205 sym_ref
= XEXP (rtl
, 0);
1206 if (TREE_CODE (decl
) == VAR_DECL
)
1207 SYMBOL_REF_FLAGS (sym_ref
) |= MACHO_SYMBOL_FLAG_VARIABLE
;
1209 if (!DECL_EXTERNAL (decl
)
1210 && (!TREE_PUBLIC (decl
) || !DECL_WEAK (decl
))
1211 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
))
1212 && ((TREE_STATIC (decl
)
1213 && (!DECL_COMMON (decl
) || !TREE_PUBLIC (decl
)))
1214 || (!DECL_COMMON (decl
) && DECL_INITIAL (decl
)
1215 && DECL_INITIAL (decl
) != error_mark_node
)))
1216 SYMBOL_REF_FLAGS (sym_ref
) |= MACHO_SYMBOL_FLAG_DEFINED
;
1218 if (! TREE_PUBLIC (decl
))
1219 SYMBOL_REF_FLAGS (sym_ref
) |= MACHO_SYMBOL_STATIC
;
1223 darwin_mark_decl_preserved (const char *name
)
1225 fprintf (asm_out_file
, "\t.no_dead_strip ");
1226 assemble_name (asm_out_file
, name
);
1227 fputc ('\n', asm_out_file
);
1231 darwin_rodata_section (int weak
, bool zsize
)
1234 ? darwin_sections
[const_coal_section
]
1235 : (zsize
? darwin_sections
[zobj_const_section
]
1236 : darwin_sections
[const_section
]));
1240 darwin_mergeable_string_section (tree exp
,
1241 unsigned HOST_WIDE_INT align
)
1243 /* Darwin's ld expects to see non-writable string literals in the .cstring
1244 section. Later versions of ld check and complain when CFStrings are
1245 enabled. Therefore we shall force the strings into .cstring since we
1246 don't support writable ones anyway. */
1247 if ((darwin_constant_cfstrings
|| flag_merge_constants
)
1248 && TREE_CODE (exp
) == STRING_CST
1249 && TREE_CODE (TREE_TYPE (exp
)) == ARRAY_TYPE
1251 && (int_size_in_bytes (TREE_TYPE (exp
))
1252 == TREE_STRING_LENGTH (exp
))
1253 && ((size_t) TREE_STRING_LENGTH (exp
)
1254 == strlen (TREE_STRING_POINTER (exp
)) + 1))
1255 return darwin_sections
[cstring_section
];
1257 if (DARWIN_SECTION_ANCHORS
&& flag_section_anchors
1258 && TREE_CODE (exp
) == STRING_CST
1259 && TREE_STRING_LENGTH (exp
) == 0)
1260 return darwin_sections
[zobj_const_section
];
1262 return readonly_data_section
;
1265 #ifndef HAVE_GAS_LITERAL16
1266 #define HAVE_GAS_LITERAL16 0
1270 darwin_mergeable_constant_section (tree exp
,
1271 unsigned HOST_WIDE_INT align
,
1274 enum machine_mode mode
= DECL_MODE (exp
);
1275 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
1277 if (DARWIN_SECTION_ANCHORS
1278 && flag_section_anchors
1280 return darwin_sections
[zobj_const_section
];
1282 if (flag_merge_constants
1285 && modesize
<= align
1288 && (align
& (align
-1)) == 0)
1290 tree size
= TYPE_SIZE_UNIT (TREE_TYPE (exp
));
1292 if (TREE_CODE (size
) == INTEGER_CST
)
1294 if (wi::eq_p (size
, 4))
1295 return darwin_sections
[literal4_section
];
1296 else if (wi::eq_p (size
, 8))
1297 return darwin_sections
[literal8_section
];
1298 else if (HAVE_GAS_LITERAL16
1300 && wi::eq_p (size
, 16))
1301 return darwin_sections
[literal16_section
];
1305 return readonly_data_section
;
1309 darwin_tm_clone_table_section (void)
1311 return get_named_section (NULL
,
1312 "__DATA,__tm_clone_table,regular,no_dead_strip",
1317 machopic_reloc_rw_mask (void)
1319 return MACHOPIC_INDIRECT
? 3 : 0;
1322 /* We have to deal with ObjC/C++ metadata section placement in the common
1323 code, since it will also be called from LTO.
1325 Return metadata attributes, if present (searching for ABI=2 first)
1326 Return NULL_TREE if no such attributes are found. */
1329 is_objc_metadata (tree decl
)
1332 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == CONST_DECL
)
1333 && DECL_ATTRIBUTES (decl
))
1335 tree meta
= lookup_attribute ("OBJC2META", DECL_ATTRIBUTES (decl
));
1338 meta
= lookup_attribute ("OBJC1META", DECL_ATTRIBUTES (decl
));
1345 static int classes_seen
;
1346 static int objc_metadata_seen
;
1348 /* Return the section required for Objective C ABI 2 metadata. */
1350 darwin_objc2_section (tree decl ATTRIBUTE_UNUSED
, tree meta
, section
* base
)
1353 tree ident
= TREE_VALUE (meta
);
1354 gcc_assert (TREE_CODE (ident
) == IDENTIFIER_NODE
);
1355 p
= IDENTIFIER_POINTER (ident
);
1357 gcc_checking_assert (flag_next_runtime
== 1 && flag_objc_abi
== 2);
1359 objc_metadata_seen
= 1;
1361 if (base
== data_section
)
1362 base
= darwin_sections
[objc2_metadata_section
];
1364 /* Most of the OBJC2 META-data end up in the base section, so check it
1366 if (!strncmp (p
, "V2_BASE", 7))
1368 else if (!strncmp (p
, "V2_STRG", 7))
1369 return darwin_sections
[cstring_section
];
1371 else if (!strncmp (p
, "G2_META", 7) || !strncmp (p
, "G2_CLAS", 7))
1372 return darwin_sections
[objc2_classdefs_section
];
1373 else if (!strncmp (p
, "V2_MREF", 7))
1374 return darwin_sections
[objc2_message_refs_section
];
1375 else if (!strncmp (p
, "V2_CLRF", 7))
1376 return darwin_sections
[objc2_classrefs_section
];
1377 else if (!strncmp (p
, "V2_SURF", 7))
1378 return darwin_sections
[objc2_super_classrefs_section
];
1379 else if (!strncmp (p
, "V2_NLCL", 7))
1380 return darwin_sections
[objc2_nonlazy_class_section
];
1381 else if (!strncmp (p
, "V2_CLAB", 7))
1384 return darwin_sections
[objc2_classlist_section
];
1386 else if (!strncmp (p
, "V2_SRFS", 7))
1387 return darwin_sections
[objc2_selector_refs_section
];
1388 else if (!strncmp (p
, "V2_NLCA", 7))
1389 return darwin_sections
[objc2_nonlazy_category_section
];
1390 else if (!strncmp (p
, "V2_CALA", 7))
1391 return darwin_sections
[objc2_categorylist_section
];
1393 else if (!strncmp (p
, "V2_PLST", 7))
1394 return darwin_sections
[objc2_protocollist_section
];
1395 else if (!strncmp (p
, "V2_PRFS", 7))
1396 return darwin_sections
[objc2_protocolrefs_section
];
1398 else if (!strncmp (p
, "V2_INFO", 7))
1399 return darwin_sections
[objc2_image_info_section
];
1401 else if (!strncmp (p
, "V2_EHTY", 7))
1402 return darwin_sections
[data_coal_section
];
1404 else if (!strncmp (p
, "V2_CSTR", 7))
1405 return darwin_sections
[objc2_constant_string_object_section
];
1407 /* Not recognized, default. */
1411 /* Return the section required for Objective C ABI 0/1 metadata. */
1413 darwin_objc1_section (tree decl ATTRIBUTE_UNUSED
, tree meta
, section
* base
)
1416 tree ident
= TREE_VALUE (meta
);
1417 gcc_assert (TREE_CODE (ident
) == IDENTIFIER_NODE
);
1418 p
= IDENTIFIER_POINTER (ident
);
1420 gcc_checking_assert (flag_next_runtime
== 1 && flag_objc_abi
< 2);
1422 objc_metadata_seen
= 1;
1424 /* String sections first, cos there are lots of strings. */
1425 if (!strncmp (p
, "V1_STRG", 7))
1426 return darwin_sections
[cstring_section
];
1427 else if (!strncmp (p
, "V1_CLSN", 7))
1428 return darwin_sections
[objc_class_names_section
];
1429 else if (!strncmp (p
, "V1_METN", 7))
1430 return darwin_sections
[objc_meth_var_names_section
];
1431 else if (!strncmp (p
, "V1_METT", 7))
1432 return darwin_sections
[objc_meth_var_types_section
];
1434 else if (!strncmp (p
, "V1_CLAS", 7))
1437 return darwin_sections
[objc_class_section
];
1439 else if (!strncmp (p
, "V1_META", 7))
1440 return darwin_sections
[objc_meta_class_section
];
1441 else if (!strncmp (p
, "V1_CATG", 7))
1442 return darwin_sections
[objc_category_section
];
1443 else if (!strncmp (p
, "V1_PROT", 7))
1444 return darwin_sections
[objc_protocol_section
];
1446 else if (!strncmp (p
, "V1_CLCV", 7))
1447 return darwin_sections
[objc_class_vars_section
];
1448 else if (!strncmp (p
, "V1_CLIV", 7))
1449 return darwin_sections
[objc_instance_vars_section
];
1451 else if (!strncmp (p
, "V1_CLCM", 7))
1452 return darwin_sections
[objc_cls_meth_section
];
1453 else if (!strncmp (p
, "V1_CLIM", 7))
1454 return darwin_sections
[objc_inst_meth_section
];
1455 else if (!strncmp (p
, "V1_CACM", 7))
1456 return darwin_sections
[objc_cat_cls_meth_section
];
1457 else if (!strncmp (p
, "V1_CAIM", 7))
1458 return darwin_sections
[objc_cat_inst_meth_section
];
1459 else if (!strncmp (p
, "V1_PNSM", 7))
1460 return darwin_sections
[objc_cat_inst_meth_section
];
1461 else if (!strncmp (p
, "V1_PCLM", 7))
1462 return darwin_sections
[objc_cat_cls_meth_section
];
1464 else if (!strncmp (p
, "V1_CLPR", 7))
1465 return darwin_sections
[objc_cat_cls_meth_section
];
1466 else if (!strncmp (p
, "V1_CAPR", 7))
1467 return darwin_sections
[objc_category_section
]; /* ??? CHECK me. */
1469 else if (!strncmp (p
, "V1_PRFS", 7))
1470 return darwin_sections
[objc_cat_cls_meth_section
];
1471 else if (!strncmp (p
, "V1_CLRF", 7))
1472 return darwin_sections
[objc_cls_refs_section
];
1473 else if (!strncmp (p
, "V1_SRFS", 7))
1474 return darwin_sections
[objc_selector_refs_section
];
1476 else if (!strncmp (p
, "V1_MODU", 7))
1477 return darwin_sections
[objc_module_info_section
];
1478 else if (!strncmp (p
, "V1_SYMT", 7))
1479 return darwin_sections
[objc_symbols_section
];
1480 else if (!strncmp (p
, "V1_INFO", 7))
1481 return darwin_sections
[objc_image_info_section
];
1483 else if (!strncmp (p
, "V1_PLST", 7))
1484 return darwin_sections
[objc1_prop_list_section
];
1485 else if (!strncmp (p
, "V1_PEXT", 7))
1486 return darwin_sections
[objc1_protocol_ext_section
];
1487 else if (!strncmp (p
, "V1_CEXT", 7))
1488 return darwin_sections
[objc1_class_ext_section
];
1490 else if (!strncmp (p
, "V2_CSTR", 7))
1491 return darwin_sections
[objc_constant_string_object_section
];
1497 machopic_select_section (tree decl
,
1499 unsigned HOST_WIDE_INT align
)
1501 bool zsize
, one
, weak
, ro
;
1502 section
*base_section
= NULL
;
1504 weak
= (DECL_P (decl
)
1506 && !lookup_attribute ("weak_import", DECL_ATTRIBUTES (decl
)));
1508 zsize
= (DECL_P (decl
)
1509 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == CONST_DECL
)
1510 && tree_to_uhwi (DECL_SIZE_UNIT (decl
)) == 0);
1513 && TREE_CODE (decl
) == VAR_DECL
1514 && DECL_ONE_ONLY (decl
);
1516 ro
= TREE_READONLY (decl
) || TREE_CONSTANT (decl
) ;
1518 switch (categorize_decl_for_section (decl
, reloc
))
1525 case SECCAT_SRODATA
:
1526 base_section
= darwin_rodata_section (weak
, zsize
);
1529 case SECCAT_RODATA_MERGE_STR
:
1530 base_section
= darwin_mergeable_string_section (decl
, align
);
1533 case SECCAT_RODATA_MERGE_STR_INIT
:
1534 base_section
= darwin_mergeable_string_section (DECL_INITIAL (decl
), align
);
1537 case SECCAT_RODATA_MERGE_CONST
:
1538 base_section
= darwin_mergeable_constant_section (decl
, align
, zsize
);
1542 case SECCAT_DATA_REL
:
1543 case SECCAT_DATA_REL_LOCAL
:
1544 case SECCAT_DATA_REL_RO
:
1545 case SECCAT_DATA_REL_RO_LOCAL
:
1551 base_section
= darwin_sections
[const_data_coal_section
];
1553 base_section
= darwin_sections
[data_coal_section
];
1555 else if (DARWIN_SECTION_ANCHORS
1556 && flag_section_anchors
1559 /* If we're doing section anchors, then punt zero-sized objects into
1560 their own sections so that they don't interfere with offset
1561 computation for the remaining vars. This does not need to be done
1562 for stuff in mergeable sections, since these are ineligible for
1565 base_section
= darwin_sections
[zobj_const_data_section
];
1567 base_section
= darwin_sections
[zobj_data_section
];
1570 base_section
= darwin_sections
[const_data_section
];
1572 base_section
= data_section
;
1578 base_section
= darwin_sections
[data_coal_section
];
1581 if (!TREE_PUBLIC (decl
))
1582 base_section
= lcomm_section
;
1583 else if (bss_noswitch_section
)
1584 base_section
= bss_noswitch_section
;
1586 base_section
= data_section
;
1594 /* Darwin weird special cases.
1595 a) OBJC Meta-data. */
1597 && (TREE_CODE (decl
) == VAR_DECL
1598 || TREE_CODE (decl
) == CONST_DECL
)
1599 && DECL_ATTRIBUTES (decl
))
1601 tree meta
= lookup_attribute ("OBJC2META", DECL_ATTRIBUTES (decl
));
1603 return darwin_objc2_section (decl
, meta
, base_section
);
1604 meta
= lookup_attribute ("OBJC1META", DECL_ATTRIBUTES (decl
));
1606 return darwin_objc1_section (decl
, meta
, base_section
);
1607 meta
= lookup_attribute ("OBJC1METG", DECL_ATTRIBUTES (decl
));
1609 return base_section
; /* GNU runtime is happy with it all in one pot. */
1612 /* b) Constant string objects. */
1613 if (TREE_CODE (decl
) == CONSTRUCTOR
1615 && TREE_CODE (TREE_TYPE (decl
)) == RECORD_TYPE
1616 && TYPE_NAME (TREE_TYPE (decl
)))
1618 tree name
= TYPE_NAME (TREE_TYPE (decl
));
1619 if (TREE_CODE (name
) == TYPE_DECL
)
1620 name
= DECL_NAME (name
);
1622 if (!strcmp (IDENTIFIER_POINTER (name
), "__builtin_ObjCString"))
1624 if (flag_next_runtime
)
1626 if (flag_objc_abi
== 2)
1627 return darwin_sections
[objc2_constant_string_object_section
];
1629 return darwin_sections
[objc_constant_string_object_section
];
1632 return darwin_sections
[objc_string_object_section
];
1634 else if (!strcmp (IDENTIFIER_POINTER (name
), "__builtin_CFString"))
1635 return darwin_sections
[cfstring_constant_object_section
];
1637 return base_section
;
1639 /* c) legacy meta-data selection. */
1640 else if (TREE_CODE (decl
) == VAR_DECL
1642 && TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
1643 && IDENTIFIER_POINTER (DECL_NAME (decl
))
1644 && flag_next_runtime
1645 && !strncmp (IDENTIFIER_POINTER (DECL_NAME (decl
)), "_OBJC_", 6))
1647 const char *name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1648 static bool warned_objc_46
= false;
1649 /* We shall assert that zero-sized objects are an error in ObjC
1651 gcc_assert (tree_to_uhwi (DECL_SIZE_UNIT (decl
)) != 0);
1653 /* ??? This mechanism for determining the metadata section is
1654 broken when LTO is in use, since the frontend that generated
1655 the data is not identified. We will keep the capability for
1656 the short term - in case any non-Objective-C programs are using
1657 it to place data in specified sections. */
1658 if (!warned_objc_46
)
1660 location_t loc
= DECL_SOURCE_LOCATION (decl
);
1661 warning_at (loc
, 0, "the use of _OBJC_-prefixed variable names"
1662 " to select meta-data sections is deprecated at 4.6"
1663 " and will be removed in 4.7");
1664 warned_objc_46
= true;
1667 if (!strncmp (name
, "_OBJC_CLASS_METHODS_", 20))
1668 return darwin_sections
[objc_cls_meth_section
];
1669 else if (!strncmp (name
, "_OBJC_INSTANCE_METHODS_", 23))
1670 return darwin_sections
[objc_inst_meth_section
];
1671 else if (!strncmp (name
, "_OBJC_CATEGORY_CLASS_METHODS_", 29))
1672 return darwin_sections
[objc_cat_cls_meth_section
];
1673 else if (!strncmp (name
, "_OBJC_CATEGORY_INSTANCE_METHODS_", 32))
1674 return darwin_sections
[objc_cat_inst_meth_section
];
1675 else if (!strncmp (name
, "_OBJC_CLASS_VARIABLES_", 22))
1676 return darwin_sections
[objc_class_vars_section
];
1677 else if (!strncmp (name
, "_OBJC_INSTANCE_VARIABLES_", 25))
1678 return darwin_sections
[objc_instance_vars_section
];
1679 else if (!strncmp (name
, "_OBJC_CLASS_PROTOCOLS_", 22))
1680 return darwin_sections
[objc_cat_cls_meth_section
];
1681 else if (!strncmp (name
, "_OBJC_CLASS_NAME_", 17))
1682 return darwin_sections
[objc_class_names_section
];
1683 else if (!strncmp (name
, "_OBJC_METH_VAR_NAME_", 20))
1684 return darwin_sections
[objc_meth_var_names_section
];
1685 else if (!strncmp (name
, "_OBJC_METH_VAR_TYPE_", 20))
1686 return darwin_sections
[objc_meth_var_types_section
];
1687 else if (!strncmp (name
, "_OBJC_CLASS_REFERENCES", 22))
1688 return darwin_sections
[objc_cls_refs_section
];
1689 else if (!strncmp (name
, "_OBJC_CLASS_", 12))
1690 return darwin_sections
[objc_class_section
];
1691 else if (!strncmp (name
, "_OBJC_METACLASS_", 16))
1692 return darwin_sections
[objc_meta_class_section
];
1693 else if (!strncmp (name
, "_OBJC_CATEGORY_", 15))
1694 return darwin_sections
[objc_category_section
];
1695 else if (!strncmp (name
, "_OBJC_SELECTOR_REFERENCES", 25))
1696 return darwin_sections
[objc_selector_refs_section
];
1697 else if (!strncmp (name
, "_OBJC_SELECTOR_FIXUP", 20))
1698 return darwin_sections
[objc_selector_fixup_section
];
1699 else if (!strncmp (name
, "_OBJC_SYMBOLS", 13))
1700 return darwin_sections
[objc_symbols_section
];
1701 else if (!strncmp (name
, "_OBJC_MODULES", 13))
1702 return darwin_sections
[objc_module_info_section
];
1703 else if (!strncmp (name
, "_OBJC_IMAGE_INFO", 16))
1704 return darwin_sections
[objc_image_info_section
];
1705 else if (!strncmp (name
, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32))
1706 return darwin_sections
[objc_cat_inst_meth_section
];
1707 else if (!strncmp (name
, "_OBJC_PROTOCOL_CLASS_METHODS_", 29))
1708 return darwin_sections
[objc_cat_cls_meth_section
];
1709 else if (!strncmp (name
, "_OBJC_PROTOCOL_REFS_", 20))
1710 return darwin_sections
[objc_cat_cls_meth_section
];
1711 else if (!strncmp (name
, "_OBJC_PROTOCOL_", 15))
1712 return darwin_sections
[objc_protocol_section
];
1714 return base_section
;
1717 return base_section
;
1720 /* This can be called with address expressions as "rtx".
1721 They must go in "const". */
1724 machopic_select_rtx_section (enum machine_mode mode
, rtx x
,
1725 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
1727 if (GET_MODE_SIZE (mode
) == 8
1728 && (GET_CODE (x
) == CONST_INT
1729 || GET_CODE (x
) == CONST_WIDE_INT
1730 || GET_CODE (x
) == CONST_DOUBLE
))
1731 return darwin_sections
[literal8_section
];
1732 else if (GET_MODE_SIZE (mode
) == 4
1733 && (GET_CODE (x
) == CONST_INT
1734 || GET_CODE (x
) == CONST_WIDE_INT
1735 || GET_CODE (x
) == CONST_DOUBLE
))
1736 return darwin_sections
[literal4_section
];
1737 else if (HAVE_GAS_LITERAL16
1739 && GET_MODE_SIZE (mode
) == 16
1740 && (GET_CODE (x
) == CONST_INT
1741 || GET_CODE (x
) == CONST_WIDE_INT
1742 || GET_CODE (x
) == CONST_DOUBLE
1743 || GET_CODE (x
) == CONST_VECTOR
))
1744 return darwin_sections
[literal16_section
];
1745 else if (MACHOPIC_INDIRECT
1746 && (GET_CODE (x
) == SYMBOL_REF
1747 || GET_CODE (x
) == CONST
1748 || GET_CODE (x
) == LABEL_REF
))
1749 return darwin_sections
[const_data_section
];
1751 return darwin_sections
[const_section
];
1755 machopic_asm_out_constructor (rtx symbol
, int priority ATTRIBUTE_UNUSED
)
1757 cdtor_record new_elt
= {symbol
, priority
, vec_safe_length (ctors
)};
1759 vec_safe_push (ctors
, new_elt
);
1761 if (! MACHOPIC_INDIRECT
)
1762 fprintf (asm_out_file
, ".reference .constructors_used\n");
1766 machopic_asm_out_destructor (rtx symbol
, int priority ATTRIBUTE_UNUSED
)
1768 cdtor_record new_elt
= {symbol
, priority
, vec_safe_length (dtors
)};
1770 vec_safe_push (dtors
, new_elt
);
1772 if (! MACHOPIC_INDIRECT
)
1773 fprintf (asm_out_file
, ".reference .destructors_used\n");
1777 sort_cdtor_records (const void * a
, const void * b
)
1779 const cdtor_record
*cda
= (const cdtor_record
*)a
;
1780 const cdtor_record
*cdb
= (const cdtor_record
*)b
;
1781 if (cda
->priority
> cdb
->priority
)
1783 if (cda
->priority
< cdb
->priority
)
1785 if (cda
->position
> cdb
->position
)
1787 if (cda
->position
< cdb
->position
)
1798 if (MACHOPIC_INDIRECT
)
1799 switch_to_section (darwin_sections
[mod_init_section
]);
1801 switch_to_section (darwin_sections
[constructor_section
]);
1803 if (vec_safe_length (ctors
) > 1)
1804 ctors
->qsort (sort_cdtor_records
);
1805 FOR_EACH_VEC_SAFE_ELT (ctors
, i
, elt
)
1807 assemble_align (POINTER_SIZE
);
1808 assemble_integer (elt
->symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1818 if (MACHOPIC_INDIRECT
)
1819 switch_to_section (darwin_sections
[mod_term_section
]);
1821 switch_to_section (darwin_sections
[destructor_section
]);
1823 if (vec_safe_length (dtors
) > 1)
1824 dtors
->qsort (sort_cdtor_records
);
1825 FOR_EACH_VEC_SAFE_ELT (dtors
, i
, elt
)
1827 assemble_align (POINTER_SIZE
);
1828 assemble_integer (elt
->symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1833 darwin_globalize_label (FILE *stream
, const char *name
)
1835 if (!!strncmp (name
, "_OBJC_", 6))
1836 default_globalize_label (stream
, name
);
1839 /* This routine returns non-zero if 'name' starts with the special objective-c
1840 anonymous file-scope static name. It accommodates c++'s mangling of such
1841 symbols (in this case the symbols will have form _ZL{d}*_OBJC_* d=digit). */
1844 darwin_label_is_anonymous_local_objc_name (const char *name
)
1846 const unsigned char *p
= (const unsigned char *) name
;
1849 if (p
[1] == 'Z' && p
[2] == 'L')
1852 while (*p
>= '0' && *p
<= '9')
1855 return (!strncmp ((const char *)p
, "_OBJC_", 6));
1858 /* LTO support for Mach-O.
1860 This version uses three mach-o sections to encapsulate the (unlimited
1861 number of) lto sections.
1863 __GNU_LTO, __lto_sections contains the concatented GNU LTO section data.
1864 __GNU_LTO, __section_names contains the GNU LTO section names.
1865 __GNU_LTO, __section_index contains an array of values that index these.
1868 <section offset from the start of __GNU_LTO, __lto_sections>,
1870 <name offset from the start of __GNU_LTO, __section_names,
1873 At present, for both m32 and m64 mach-o files each of these fields is
1874 represented by a uint32_t. This is because, AFAICT, a mach-o object
1875 cannot exceed 4Gb because the section_64 offset field (see below) is 32bits.
1878 "offset An integer specifying the offset to this section in the file." */
1880 /* Count lto section numbers. */
1881 static unsigned int lto_section_num
= 0;
1883 /* A vector of information about LTO sections, at present, we only have
1884 the name. TODO: see if we can get the data length somehow. */
1885 typedef struct GTY (()) darwin_lto_section_e
{
1886 const char *sectname
;
1887 } darwin_lto_section_e
;
1889 static GTY (()) vec
<darwin_lto_section_e
, va_gc
> *lto_section_names
;
1891 /* Segment for LTO data. */
1892 #define LTO_SEGMENT_NAME "__GNU_LTO"
1894 /* Section wrapper scheme (used here to wrap the unlimited number of LTO
1895 sections into three Mach-O ones).
1896 NOTE: These names MUST be kept in sync with those in
1897 libiberty/simple-object-mach-o. */
1898 #define LTO_SECTS_SECTION "__wrapper_sects"
1899 #define LTO_NAMES_SECTION "__wrapper_names"
1900 #define LTO_INDEX_SECTION "__wrapper_index"
1902 /* File to temporarily store LTO data. This is appended to asm_out_file
1903 in darwin_end_file. */
1904 static FILE *lto_asm_out_file
, *saved_asm_out_file
;
1905 static char *lto_asm_out_name
;
1907 /* Prepare asm_out_file for LTO output. For darwin, this means hiding
1908 asm_out_file and switching to an alternative output file. */
1910 darwin_asm_lto_start (void)
1912 gcc_assert (! saved_asm_out_file
);
1913 saved_asm_out_file
= asm_out_file
;
1914 if (! lto_asm_out_name
)
1915 lto_asm_out_name
= make_temp_file (".lto.s");
1916 lto_asm_out_file
= fopen (lto_asm_out_name
, "a");
1917 if (lto_asm_out_file
== NULL
)
1918 fatal_error ("failed to open temporary file %s for LTO output",
1920 asm_out_file
= lto_asm_out_file
;
1923 /* Restore asm_out_file. */
1925 darwin_asm_lto_end (void)
1927 gcc_assert (saved_asm_out_file
);
1928 fclose (lto_asm_out_file
);
1929 asm_out_file
= saved_asm_out_file
;
1930 saved_asm_out_file
= NULL
;
1934 darwin_asm_dwarf_section (const char *name
, unsigned int flags
, tree decl
);
1936 /* Called for the TARGET_ASM_NAMED_SECTION hook. */
1939 darwin_asm_named_section (const char *name
,
1941 tree decl ATTRIBUTE_UNUSED
)
1943 /* LTO sections go in a special section that encapsulates the (unlimited)
1944 number of GNU LTO sections within a single mach-o one. */
1945 if (strncmp (name
, LTO_SECTION_NAME_PREFIX
,
1946 strlen (LTO_SECTION_NAME_PREFIX
)) == 0)
1948 darwin_lto_section_e e
;
1949 /* We expect certain flags to be set... */
1950 gcc_assert ((flags
& (SECTION_DEBUG
| SECTION_NAMED
))
1951 == (SECTION_DEBUG
| SECTION_NAMED
));
1953 /* Switch to our combined section. */
1954 fprintf (asm_out_file
, "\t.section %s,%s,regular,debug\n",
1955 LTO_SEGMENT_NAME
, LTO_SECTS_SECTION
);
1956 /* Output a label for the start of this sub-section. */
1957 fprintf (asm_out_file
, "L_GNU_LTO%d:\t;# %s\n",
1958 lto_section_num
, name
);
1959 /* We have to jump through hoops to get the values of the intra-section
1961 fprintf (asm_out_file
, "\t.set L$gnu$lto$offs%d,L_GNU_LTO%d-L_GNU_LTO0\n",
1962 lto_section_num
, lto_section_num
);
1963 fprintf (asm_out_file
,
1964 "\t.set L$gnu$lto$size%d,L_GNU_LTO%d-L_GNU_LTO%d\n",
1965 lto_section_num
, lto_section_num
+1, lto_section_num
);
1967 e
.sectname
= xstrdup (name
);
1968 /* Keep the names, we'll need to make a table later.
1969 TODO: check that we do not revisit sections, that would break
1970 the assumption of how this is done. */
1971 if (lto_section_names
== NULL
)
1972 vec_alloc (lto_section_names
, 16);
1973 vec_safe_push (lto_section_names
, e
);
1975 else if (strncmp (name
, "__DWARF,", 8) == 0)
1976 darwin_asm_dwarf_section (name
, flags
, decl
);
1978 fprintf (asm_out_file
, "\t.section %s\n", name
);
1982 darwin_unique_section (tree decl ATTRIBUTE_UNUSED
, int reloc ATTRIBUTE_UNUSED
)
1984 /* Darwin does not use unique sections. */
1987 /* Handle __attribute__ ((apple_kext_compatibility)).
1988 This only applies to darwin kexts for 2.95 compatibility -- it shrinks the
1989 vtable for classes with this attribute (and their descendants) by not
1990 outputting the new 3.0 nondeleting destructor. This means that such
1991 objects CANNOT be allocated on the stack or as globals UNLESS they have
1992 a completely empty `operator delete'.
1993 Luckily, this fits in with the Darwin kext model.
1995 This attribute also disables gcc3's potential overlaying of derived
1996 class data members on the padding at the end of the base class. */
1999 darwin_handle_kext_attribute (tree
*node
, tree name
,
2000 tree args ATTRIBUTE_UNUSED
,
2001 int flags ATTRIBUTE_UNUSED
,
2004 /* APPLE KEXT stuff -- only applies with pure static C++ code. */
2005 if (! TARGET_KEXTABI
)
2007 warning (0, "%qE 2.95 vtable-compatibility attribute applies "
2008 "only when compiling a kext", name
);
2010 *no_add_attrs
= true;
2012 else if (TREE_CODE (*node
) != RECORD_TYPE
)
2014 warning (0, "%qE 2.95 vtable-compatibility attribute applies "
2015 "only to C++ classes", name
);
2017 *no_add_attrs
= true;
2023 /* Handle a "weak_import" attribute; arguments as in
2024 struct attribute_spec.handler. */
2027 darwin_handle_weak_import_attribute (tree
*node
, tree name
,
2028 tree
ARG_UNUSED (args
),
2029 int ARG_UNUSED (flags
),
2030 bool * no_add_attrs
)
2032 if (TREE_CODE (*node
) != FUNCTION_DECL
&& TREE_CODE (*node
) != VAR_DECL
)
2034 warning (OPT_Wattributes
, "%qE attribute ignored",
2036 *no_add_attrs
= true;
2039 declare_weak (*node
);
2044 /* Emit a label for an FDE, making it global and/or weak if appropriate.
2045 The third parameter is nonzero if this is for exception handling.
2046 The fourth parameter is nonzero if this is just a placeholder for an
2047 FDE that we are omitting. */
2050 darwin_emit_unwind_label (FILE *file
, tree decl
, int for_eh
, int empty
)
2054 static int invok_count
= 0;
2055 static tree last_fun_decl
= NULL_TREE
;
2057 /* We use the linker to emit the .eh labels for Darwin 9 and above. */
2058 if (! for_eh
|| generating_for_darwin_version
>= 9)
2061 /* FIXME: This only works when the eh for all sections of a function is
2062 emitted at the same time. If that changes, we would need to use a lookup
2063 table of some form to determine what to do. Also, we should emit the
2064 unadorned label for the partition containing the public label for a
2065 function. This is of limited use, probably, since we do not currently
2066 enable partitioning. */
2067 strcpy (buf
, ".eh");
2068 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
2070 if (decl
== last_fun_decl
)
2073 snprintf (buf
, 31, "$$part$$%d.eh", invok_count
);
2077 last_fun_decl
= decl
;
2082 lab
= concat (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)), buf
, NULL
);
2084 if (TREE_PUBLIC (decl
))
2086 targetm
.asm_out
.globalize_label (file
, lab
);
2087 if (DECL_VISIBILITY (decl
) == VISIBILITY_HIDDEN
)
2089 fputs ("\t.private_extern ", file
);
2090 assemble_name (file
, lab
);
2095 if (DECL_WEAK (decl
))
2097 fputs ("\t.weak_definition ", file
);
2098 assemble_name (file
, lab
);
2102 assemble_name (file
, lab
);
2105 fputs (" = 0\n", file
);
2107 /* Mark the absolute .eh and .eh1 style labels as needed to
2108 ensure that we don't dead code strip them and keep such
2109 labels from another instantiation point until we can fix this
2110 properly with group comdat support. */
2111 darwin_mark_decl_preserved (lab
);
2114 fputs (":\n", file
);
2119 static GTY(()) unsigned long except_table_label_num
;
2122 darwin_emit_except_table_label (FILE *file
)
2124 char section_start_label
[30];
2126 ASM_GENERATE_INTERNAL_LABEL (section_start_label
, "GCC_except_table",
2127 except_table_label_num
++);
2128 ASM_OUTPUT_LABEL (file
, section_start_label
);
2130 /* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */
2133 darwin_non_lazy_pcrel (FILE *file
, rtx addr
)
2135 const char *nlp_name
;
2137 gcc_assert (GET_CODE (addr
) == SYMBOL_REF
);
2139 nlp_name
= machopic_indirection_name (addr
, /*stub_p=*/false);
2140 fputs ("\t.long\t", file
);
2141 ASM_OUTPUT_LABELREF (file
, nlp_name
);
2145 /* If this is uncommented, details of each allocation will be printed
2146 in the asm right before the actual code. WARNING - this will cause some
2147 test-suite fails (since the printout will contain items that some tests
2148 are not expecting) -- so don't leave it on by default (it bloats the
2150 /*#define DEBUG_DARWIN_MEM_ALLOCATORS*/
2152 /* The first two of these routines are ostensibly just intended to put
2153 names into the asm. However, they are both hijacked in order to ensure
2154 that zero-sized items do not make their way into the output. Consequently,
2155 we also need to make these participate in provisions for dealing with
2156 such items in section anchors. */
2158 /* The implementation of ASM_DECLARE_OBJECT_NAME. */
2159 /* The RTTI data (e.g., __ti4name) is common and public (and static),
2160 but it does need to be referenced via indirect PIC data pointers.
2161 The machopic_define_symbol calls are telling the machopic subsystem
2162 that the name *is* defined in this module, so it doesn't need to
2163 make them indirect. */
2165 darwin_asm_declare_object_name (FILE *file
,
2166 const char *nam
, tree decl
)
2168 const char *xname
= nam
;
2169 unsigned HOST_WIDE_INT size
;
2170 bool local_def
, weak
;
2172 weak
= (DECL_P (decl
)
2174 && !lookup_attribute ("weak_import",
2175 DECL_ATTRIBUTES (decl
)));
2177 local_def
= DECL_INITIAL (decl
) || (TREE_STATIC (decl
)
2178 && (!DECL_COMMON (decl
)
2179 || !TREE_PUBLIC (decl
)));
2181 if (GET_CODE (XEXP (DECL_RTL (decl
), 0)) != SYMBOL_REF
)
2182 xname
= IDENTIFIER_POINTER (DECL_NAME (decl
));
2186 (* targetm
.encode_section_info
) (decl
, DECL_RTL (decl
), false);
2188 machopic_define_symbol (DECL_RTL (decl
));
2191 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2193 #ifdef DEBUG_DARWIN_MEM_ALLOCATORS
2194 fprintf (file
, "# dadon: %s %s (%llu, %u) local %d weak %d"
2195 " stat %d com %d pub %d t-const %d t-ro %d init %lx\n",
2196 xname
, (TREE_CODE (decl
) == VAR_DECL
?"var":"const"),
2197 (unsigned long long)size
, DECL_ALIGN (decl
), local_def
,
2198 DECL_WEAK (decl
), TREE_STATIC (decl
), DECL_COMMON (decl
),
2199 TREE_PUBLIC (decl
), TREE_CONSTANT (decl
), TREE_READONLY (decl
),
2200 (unsigned long)DECL_INITIAL (decl
));
2203 /* Darwin needs help to support local zero-sized objects.
2204 They must be made at least one byte, and the section containing must be
2205 marked as unsuitable for section-anchors (see storage allocators below).
2207 For non-zero objects this output is handled by varasm.c.
2211 unsigned int l2align
= 0;
2213 /* The align must be honored, even for zero-sized. */
2214 if (DECL_ALIGN (decl
))
2216 l2align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
2217 fprintf (file
, "\t.align\t%u\n", l2align
);
2220 ASM_OUTPUT_LABEL (file
, xname
);
2222 fprintf (file
, "\t.space\t"HOST_WIDE_INT_PRINT_UNSIGNED
"\n", size
);
2224 /* Check that we've correctly picked up the zero-sized item and placed it
2226 gcc_assert ((!DARWIN_SECTION_ANCHORS
|| !flag_section_anchors
)
2228 && (in_section
->common
.flags
& SECTION_NO_ANCHOR
)));
2231 ASM_OUTPUT_LABEL (file
, xname
);
2234 /* The implementation of ASM_DECLARE_CONSTANT_NAME. */
2236 darwin_asm_declare_constant_name (FILE *file
, const char *name
,
2237 const_tree exp ATTRIBUTE_UNUSED
,
2240 assemble_label (file
, name
);
2241 /* As for other items, we need at least one byte. */
2244 fputs ("\t.space\t1\n", file
);
2245 /* Check that we've correctly picked up the zero-sized item and placed it
2247 gcc_assert ((!DARWIN_SECTION_ANCHORS
|| !flag_section_anchors
)
2249 && (in_section
->common
.flags
& SECTION_NO_ANCHOR
)));
2253 /* Darwin storage allocators.
2255 Zerofill sections are desirable for large blank data since, otherwise, these
2256 data bloat objects (PR33210).
2258 However, section anchors don't work in .zerofill sections (one cannot switch
2259 to a zerofill section). Ergo, for Darwin targets using section anchors we need
2260 to put (at least some) data into 'normal' switchable sections.
2262 Here we set a relatively arbitrary value for the size of an object to trigger
2263 zerofill when section anchors are enabled (anything bigger than a page for
2264 current Darwin implementations). FIXME: there ought to be some objective way
2265 to make this choice.
2267 When section anchor are off this is ignored anyway. */
2269 #define BYTES_ZFILL 4096
2271 /* Emit a chunk of data for items coalesced by the linker. */
2273 darwin_emit_weak_or_comdat (FILE *fp
, tree decl
, const char *name
,
2274 unsigned HOST_WIDE_INT size
,
2277 /* Since the sections used here are coalesed, they will not be eligible
2278 for section anchors, and therefore we don't need to break that out. */
2279 if (TREE_READONLY (decl
) || TREE_CONSTANT (decl
))
2280 switch_to_section (darwin_sections
[const_data_coal_section
]);
2282 switch_to_section (darwin_sections
[data_coal_section
]);
2284 /* To be consistent, we'll allow darwin_asm_declare_object_name to assemble
2285 the align info for zero-sized items... but do it here otherwise. */
2287 fprintf (fp
, "\t.align\t%d\n", floor_log2 (align
/ BITS_PER_UNIT
));
2289 if (TREE_PUBLIC (decl
))
2290 darwin_globalize_label (fp
, name
);
2292 /* ... and we let it deal with outputting one byte of zero for them too. */
2293 darwin_asm_declare_object_name (fp
, name
, decl
);
2295 assemble_zeros (size
);
2298 /* Emit a chunk of data for ObjC meta-data that got placed in BSS erroneously. */
2300 darwin_emit_objc_zeroed (FILE *fp
, tree decl
, const char *name
,
2301 unsigned HOST_WIDE_INT size
,
2302 unsigned int align
, tree meta
)
2304 section
*ocs
= data_section
;
2306 if (TREE_PURPOSE (meta
) == get_identifier("OBJC2META"))
2307 ocs
= darwin_objc2_section (decl
, meta
, ocs
);
2309 ocs
= darwin_objc1_section (decl
, meta
, ocs
);
2311 switch_to_section (ocs
);
2313 /* We shall declare that zero-sized meta-data are not valid (yet). */
2315 fprintf (fp
, "\t.align\t%d\n", floor_log2 (align
/ BITS_PER_UNIT
));
2317 /* ... and we let it deal with outputting one byte of zero for them too. */
2318 darwin_asm_declare_object_name (fp
, name
, decl
);
2319 assemble_zeros (size
);
2322 /* This routine emits 'local' storage:
2324 When Section Anchors are off this routine emits .zerofill commands in
2325 sections named for their alignment.
2327 When Section Anchors are on, smaller (non-zero-sized) items are placed in
2328 the .static_data section so that the section anchoring system can see them.
2329 Larger items are still placed in .zerofill sections, addressing PR33210.
2330 The routine has no checking - it is all assumed to be done by the caller.
2333 darwin_emit_local_bss (FILE *fp
, tree decl
, const char *name
,
2334 unsigned HOST_WIDE_INT size
,
2335 unsigned int l2align
)
2337 /* FIXME: We have a fudge to make this work with Java even when the target does
2338 not use sections anchors -- Java seems to need at least one small item in a
2339 non-zerofill segment. */
2340 if ((DARWIN_SECTION_ANCHORS
&& flag_section_anchors
&& size
< BYTES_ZFILL
)
2341 || (size
&& size
<= 2))
2343 /* Put smaller objects in _static_data, where the section anchors system
2345 However, if they are zero-sized punt them to yet a different section
2346 (that is not allowed to participate in anchoring). */
2349 fputs ("\t.section\t__DATA,__zobj_bss\n", fp
);
2350 in_section
= darwin_sections
[zobj_bss_section
];
2355 fputs ("\t.static_data\n", fp
);
2356 in_section
= darwin_sections
[static_data_section
];
2360 fprintf (fp
, "\t.align\t%u\n", l2align
);
2362 assemble_name (fp
, name
);
2363 fprintf (fp
, ":\n\t.space\t"HOST_WIDE_INT_PRINT_UNSIGNED
"\n", size
);
2367 /* When we are on a non-section anchor target, we can get zero-sized
2368 items here. However, all we need to do is to bump them to one byte
2369 and the section alignment will take care of the rest. */
2371 unsigned int flags
;
2372 snprintf (secnam
, 64, "__DATA,__%sbss%u", ((size
)?"":"zo_"),
2373 (unsigned) l2align
);
2374 /* We can't anchor (yet, if ever) in zerofill sections, because we can't
2375 switch to them and emit a label. */
2376 flags
= SECTION_BSS
|SECTION_WRITE
|SECTION_NO_ANCHOR
;
2377 in_section
= get_section (secnam
, flags
, NULL
);
2378 fprintf (fp
, "\t.zerofill %s,", secnam
);
2379 assemble_name (fp
, name
);
2384 fprintf (fp
, ","HOST_WIDE_INT_PRINT_UNSIGNED
",%u\n",
2385 size
, (unsigned) l2align
);
2387 fprintf (fp
, ","HOST_WIDE_INT_PRINT_UNSIGNED
"\n", size
);
2390 (*targetm
.encode_section_info
) (decl
, DECL_RTL (decl
), false);
2391 /* This is defined as a file-scope var, so we know to notify machopic. */
2392 machopic_define_symbol (DECL_RTL (decl
));
2395 /* Emit a chunk of common. */
2397 darwin_emit_common (FILE *fp
, const char *name
,
2398 unsigned HOST_WIDE_INT size
, unsigned int align
)
2400 unsigned HOST_WIDE_INT rounded
;
2401 unsigned int l2align
;
2403 /* Earlier systems complain if the alignment exceeds the page size.
2404 The magic number is 4096 * 8 - hard-coded for legacy systems. */
2405 if (!emit_aligned_common
&& (align
> 32768UL))
2406 align
= 4096UL; /* In units. */
2408 align
/= BITS_PER_UNIT
;
2410 /* Make sure we have a meaningful align. */
2414 /* For earlier toolchains, we need to emit the var as a rounded size to
2415 tell ld the alignment. */
2419 rounded
= (size
+ (align
-1)) & ~(align
-1);
2421 l2align
= floor_log2 (align
);
2422 gcc_assert (l2align
<= L2_MAX_OFILE_ALIGNMENT
);
2424 in_section
= comm_section
;
2425 /* We mustn't allow multiple public symbols to share an address when using
2426 the normal OSX toolchain. */
2429 /* Put at least one byte. */
2431 /* This section can no longer participate in section anchoring. */
2432 comm_section
->common
.flags
|= SECTION_NO_ANCHOR
;
2435 fputs ("\t.comm\t", fp
);
2436 assemble_name (fp
, name
);
2437 fprintf (fp
, "," HOST_WIDE_INT_PRINT_UNSIGNED
,
2438 emit_aligned_common
?size
:rounded
);
2439 if (l2align
&& emit_aligned_common
)
2440 fprintf (fp
, ",%u", l2align
);
2444 /* Output a var which is all zero - into aligned BSS sections, common, lcomm
2445 or coalescable data sections (for weak or comdat) as appropriate. */
2448 darwin_output_aligned_bss (FILE *fp
, tree decl
, const char *name
,
2449 unsigned HOST_WIDE_INT size
, unsigned int align
)
2451 unsigned int l2align
;
2452 bool one
, pub
, weak
;
2455 pub
= TREE_PUBLIC (decl
);
2456 one
= DECL_ONE_ONLY (decl
);
2457 weak
= (DECL_P (decl
)
2459 && !lookup_attribute ("weak_import",
2460 DECL_ATTRIBUTES (decl
)));
2462 #ifdef DEBUG_DARWIN_MEM_ALLOCATORS
2463 fprintf (fp
, "# albss: %s (%lld,%d) ro %d cst %d stat %d com %d"
2464 " pub %d weak %d one %d init %lx\n",
2465 name
, (long long)size
, (int)align
, TREE_READONLY (decl
),
2466 TREE_CONSTANT (decl
), TREE_STATIC (decl
), DECL_COMMON (decl
),
2467 pub
, weak
, one
, (unsigned long)DECL_INITIAL (decl
));
2470 /* ObjC metadata can get put in BSS because varasm.c decides it's BSS
2471 before the target has a chance to comment. */
2472 if ((meta
= is_objc_metadata (decl
)))
2474 darwin_emit_objc_zeroed (fp
, decl
, name
, size
, DECL_ALIGN (decl
), meta
);
2478 /* Check that any initializer is valid. */
2479 gcc_assert ((DECL_INITIAL (decl
) == NULL
)
2480 || (DECL_INITIAL (decl
) == error_mark_node
)
2481 || initializer_zerop (DECL_INITIAL (decl
)));
2483 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
);
2484 gcc_assert (!DECL_COMMON (decl
));
2486 /* Pick up the correct alignment. */
2487 if (!size
|| !align
)
2488 align
= DECL_ALIGN (decl
);
2490 l2align
= floor_log2 (align
/ BITS_PER_UNIT
);
2491 gcc_assert (l2align
<= L2_MAX_OFILE_ALIGNMENT
);
2493 last_assemble_variable_decl
= decl
;
2495 /* We would rather not have to check this here - but it seems that we might
2496 be passed a decl that should be in coalesced space. */
2499 /* Weak or COMDAT objects are put in mergeable sections. */
2500 darwin_emit_weak_or_comdat (fp
, decl
, name
, size
,
2505 /* If this is not public, then emit according to local rules. */
2508 darwin_emit_local_bss (fp
, decl
, name
, size
, l2align
);
2512 /* So we have a public symbol (small item fudge for Java, see above). */
2513 if ((DARWIN_SECTION_ANCHORS
&& flag_section_anchors
&& size
< BYTES_ZFILL
)
2514 || (size
&& size
<= 2))
2516 /* Put smaller objects in data, where the section anchors system can get
2517 them. However, if they are zero-sized punt them to yet a different
2518 section (that is not allowed to participate in anchoring). */
2521 fputs ("\t.section\t__DATA,__zobj_data\n", fp
);
2522 in_section
= darwin_sections
[zobj_data_section
];
2527 fputs ("\t.data\n", fp
);
2528 in_section
= data_section
;
2532 fprintf (fp
, "\t.align\t%u\n", l2align
);
2534 assemble_name (fp
, name
);
2535 fprintf (fp
, ":\n\t.space\t"HOST_WIDE_INT_PRINT_UNSIGNED
"\n", size
);
2540 unsigned int flags
;
2541 /* When we are on a non-section anchor target, we can get zero-sized
2542 items here. However, all we need to do is to bump them to one byte
2543 and the section alignment will take care of the rest. */
2544 snprintf (secnam
, 64, "__DATA,__%spu_bss%u", ((size
)?"":"zo_"), l2align
);
2546 /* We can't anchor in zerofill sections, because we can't switch
2547 to them and emit a label. */
2548 flags
= SECTION_BSS
|SECTION_WRITE
|SECTION_NO_ANCHOR
;
2549 in_section
= get_section (secnam
, flags
, NULL
);
2550 fprintf (fp
, "\t.zerofill %s,", secnam
);
2551 assemble_name (fp
, name
);
2556 fprintf (fp
, ","HOST_WIDE_INT_PRINT_UNSIGNED
",%u\n", size
, l2align
);
2558 fprintf (fp
, ","HOST_WIDE_INT_PRINT_UNSIGNED
"\n", size
);
2560 (* targetm
.encode_section_info
) (decl
, DECL_RTL (decl
), false);
2563 /* Output a chunk of common, with alignment specified (where the target
2566 darwin_asm_output_aligned_decl_common (FILE *fp
, tree decl
, const char *name
,
2567 unsigned HOST_WIDE_INT size
,
2570 unsigned int l2align
;
2574 /* No corresponding var. */
2577 #ifdef DEBUG_DARWIN_MEM_ALLOCATORS
2578 fprintf (fp
, "# adcom: %s (%d,%d) decl=0x0\n", name
, (int)size
, (int)align
);
2580 darwin_emit_common (fp
, name
, size
, align
);
2584 one
= DECL_ONE_ONLY (decl
);
2585 weak
= (DECL_P (decl
)
2587 && !lookup_attribute ("weak_import",
2588 DECL_ATTRIBUTES (decl
)));
2590 #ifdef DEBUG_DARWIN_MEM_ALLOCATORS
2591 fprintf (fp
, "# adcom: %s (%lld,%d) ro %d cst %d stat %d com %d pub %d"
2592 " weak %d one %d init %lx\n",
2593 name
, (long long)size
, (int)align
, TREE_READONLY (decl
),
2594 TREE_CONSTANT (decl
), TREE_STATIC (decl
), DECL_COMMON (decl
),
2595 TREE_PUBLIC (decl
), weak
, one
, (unsigned long)DECL_INITIAL (decl
));
2598 /* ObjC metadata can get put in BSS because varasm.c decides it's BSS
2599 before the target has a chance to comment. */
2600 if ((meta
= is_objc_metadata (decl
)))
2602 darwin_emit_objc_zeroed (fp
, decl
, name
, size
, DECL_ALIGN (decl
), meta
);
2606 /* We shouldn't be messing with this if the decl has a section name. */
2607 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
);
2609 /* We would rather not have to check this here - but it seems that we might
2610 be passed a decl that should be in coalesced space. */
2613 /* Weak or COMDAT objects are put in mergable sections. */
2614 darwin_emit_weak_or_comdat (fp
, decl
, name
, size
,
2619 /* We should only get here for DECL_COMMON, with a zero init (and, in
2620 principle, only for public symbols too - although we deal with local
2623 /* Check the initializer is OK. */
2624 gcc_assert (DECL_COMMON (decl
)
2625 && ((DECL_INITIAL (decl
) == NULL
)
2626 || (DECL_INITIAL (decl
) == error_mark_node
)
2627 || initializer_zerop (DECL_INITIAL (decl
))));
2629 last_assemble_variable_decl
= decl
;
2631 if (!size
|| !align
)
2632 align
= DECL_ALIGN (decl
);
2634 l2align
= floor_log2 (align
/ BITS_PER_UNIT
);
2635 /* Check we aren't asking for more aligment than the platform allows. */
2636 gcc_assert (l2align
<= L2_MAX_OFILE_ALIGNMENT
);
2638 if (TREE_PUBLIC (decl
) != 0)
2639 darwin_emit_common (fp
, name
, size
, align
);
2641 darwin_emit_local_bss (fp
, decl
, name
, size
, l2align
);
2644 /* Output a chunk of BSS with alignment specfied. */
2646 darwin_asm_output_aligned_decl_local (FILE *fp
, tree decl
, const char *name
,
2647 unsigned HOST_WIDE_INT size
,
2650 unsigned long l2align
;
2654 one
= DECL_ONE_ONLY (decl
);
2655 weak
= (DECL_P (decl
)
2657 && !lookup_attribute ("weak_import",
2658 DECL_ATTRIBUTES (decl
)));
2660 #ifdef DEBUG_DARWIN_MEM_ALLOCATORS
2661 fprintf (fp
, "# adloc: %s (%lld,%d) ro %d cst %d stat %d one %d pub %d"
2662 " weak %d init %lx\n",
2663 name
, (long long)size
, (int)align
, TREE_READONLY (decl
),
2664 TREE_CONSTANT (decl
), TREE_STATIC (decl
), one
, TREE_PUBLIC (decl
),
2665 weak
, (unsigned long)DECL_INITIAL (decl
));
2668 /* ObjC metadata can get put in BSS because varasm.c decides it's BSS
2669 before the target has a chance to comment. */
2670 if ((meta
= is_objc_metadata (decl
)))
2672 darwin_emit_objc_zeroed (fp
, decl
, name
, size
, DECL_ALIGN (decl
), meta
);
2676 /* We shouldn't be messing with this if the decl has a section name. */
2677 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
);
2679 /* We would rather not have to check this here - but it seems that we might
2680 be passed a decl that should be in coalesced space. */
2683 /* Weak or COMDAT objects are put in mergable sections. */
2684 darwin_emit_weak_or_comdat (fp
, decl
, name
, size
,
2689 /* .. and it should be suitable for placement in local mem. */
2690 gcc_assert(!TREE_PUBLIC (decl
) && !DECL_COMMON (decl
));
2691 /* .. and any initializer must be all-zero. */
2692 gcc_assert ((DECL_INITIAL (decl
) == NULL
)
2693 || (DECL_INITIAL (decl
) == error_mark_node
)
2694 || initializer_zerop (DECL_INITIAL (decl
)));
2696 last_assemble_variable_decl
= decl
;
2698 if (!size
|| !align
)
2699 align
= DECL_ALIGN (decl
);
2701 l2align
= floor_log2 (align
/ BITS_PER_UNIT
);
2702 gcc_assert (l2align
<= L2_MAX_OFILE_ALIGNMENT
);
2704 darwin_emit_local_bss (fp
, decl
, name
, size
, l2align
);
2707 /* Emit an assembler directive to set visibility for a symbol. The
2708 only supported visibilities are VISIBILITY_DEFAULT and
2709 VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private
2710 extern". There is no MACH-O equivalent of ELF's
2711 VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */
2714 darwin_assemble_visibility (tree decl
, int vis
)
2716 if (vis
== VISIBILITY_DEFAULT
)
2718 else if (vis
== VISIBILITY_HIDDEN
|| vis
== VISIBILITY_INTERNAL
)
2720 fputs ("\t.private_extern ", asm_out_file
);
2721 assemble_name (asm_out_file
,
2722 (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
))));
2723 fputs ("\n", asm_out_file
);
2726 warning (OPT_Wattributes
, "protected visibility attribute "
2727 "not supported in this configuration; ignored");
2730 /* vec used by darwin_asm_dwarf_section.
2731 Maybe a hash tab would be better here - but the intention is that this is
2732 a very short list (fewer than 16 items) and each entry should (ideally,
2733 eventually) only be presented once.
2735 A structure to hold a dwarf debug section used entry. */
2737 typedef struct GTY(()) dwarf_sect_used_entry
{
2741 dwarf_sect_used_entry
;
2744 /* A list of used __DWARF sections. */
2745 static GTY (()) vec
<dwarf_sect_used_entry
, va_gc
> *dwarf_sect_names_table
;
2747 /* This is called when we are asked to assemble a named section and the
2748 name begins with __DWARF,. We keep a list of the section names (without
2749 the __DWARF, prefix) and use this to emit our required start label on the
2750 first switch to each section. */
2753 darwin_asm_dwarf_section (const char *name
, unsigned int flags
,
2754 tree
ARG_UNUSED (decl
))
2759 dwarf_sect_used_entry
*ref
;
2761 gcc_assert ((flags
& (SECTION_DEBUG
| SECTION_NAMED
))
2762 == (SECTION_DEBUG
| SECTION_NAMED
));
2763 /* We know that the name starts with __DWARF, */
2765 namelen
= strchr (sname
, ',') - sname
;
2766 gcc_assert (namelen
);
2767 if (dwarf_sect_names_table
== NULL
)
2768 vec_alloc (dwarf_sect_names_table
, 16);
2771 dwarf_sect_names_table
->iterate (i
, &ref
);
2776 if (!strcmp (ref
->name
, sname
))
2784 fprintf (asm_out_file
, "\t.section %s\n", name
);
2787 dwarf_sect_used_entry e
;
2788 fprintf (asm_out_file
, "Lsection%.*s:\n", namelen
, sname
);
2790 e
.name
= xstrdup (sname
);
2791 vec_safe_push (dwarf_sect_names_table
, e
);
2795 /* Output a difference of two labels that will be an assembly time
2796 constant if the two labels are local. (.long lab1-lab2 will be
2797 very different if lab1 is at the boundary between two sections; it
2798 will be relocated according to the second section, not the first,
2799 so one ends up with a difference between labels in different
2800 sections, which is bad in the dwarf2 eh context for instance.) */
2802 static int darwin_dwarf_label_counter
;
2805 darwin_asm_output_dwarf_delta (FILE *file
, int size
,
2806 const char *lab1
, const char *lab2
)
2808 int islocaldiff
= (lab1
[0] == '*' && lab1
[1] == 'L'
2809 && lab2
[0] == '*' && lab2
[1] == 'L');
2810 const char *directive
= (size
== 8 ? ".quad" : ".long");
2813 fprintf (file
, "\t.set L$set$%d,", darwin_dwarf_label_counter
);
2815 fprintf (file
, "\t%s\t", directive
);
2817 assemble_name_raw (file
, lab1
);
2818 fprintf (file
, "-");
2819 assemble_name_raw (file
, lab2
);
2821 fprintf (file
, "\n\t%s L$set$%d", directive
, darwin_dwarf_label_counter
++);
2824 /* Output an offset in a DWARF section on Darwin. On Darwin, DWARF section
2825 offsets are not represented using relocs in .o files; either the
2826 section never leaves the .o file, or the linker or other tool is
2827 responsible for parsing the DWARF and updating the offsets. */
2830 darwin_asm_output_dwarf_offset (FILE *file
, int size
, const char * lab
,
2836 gcc_assert (base
->common
.flags
& SECTION_NAMED
);
2837 gcc_assert (strncmp (base
->named
.name
, "__DWARF,", 8) == 0);
2838 gcc_assert (strchr (base
->named
.name
+ 8, ','));
2840 namelen
= strchr (base
->named
.name
+ 8, ',') - (base
->named
.name
+ 8);
2841 sprintf (sname
, "*Lsection%.*s", namelen
, base
->named
.name
+ 8);
2842 darwin_asm_output_dwarf_delta (file
, size
, lab
, sname
);
2845 /* Called from the within the TARGET_ASM_FILE_START for each target. */
2848 darwin_file_start (void)
2850 /* Nothing to do. */
2853 /* Called for the TARGET_ASM_FILE_END hook.
2854 Emit the mach-o pic indirection data, the lto data and, finally a flag
2855 to tell the linker that it can break the file object into sections and
2856 move those around for efficiency. */
2859 darwin_file_end (void)
2861 if (!vec_safe_is_empty (ctors
))
2863 if (!vec_safe_is_empty (dtors
))
2866 /* If we are expecting to output NeXT ObjC meta-data, (and we actually see
2867 some) then we output the fix-and-continue marker (Image Info).
2868 This applies to Objective C, Objective C++ and LTO with either language
2869 as part of the input. */
2870 if (flag_next_runtime
&& objc_metadata_seen
)
2872 unsigned int flags
= 0;
2873 if (flag_objc_abi
>= 2)
2876 output_section_asm_op
2877 (darwin_sections
[objc2_image_info_section
]->unnamed
.data
);
2880 output_section_asm_op
2881 (darwin_sections
[objc_image_info_section
]->unnamed
.data
);
2883 ASM_OUTPUT_ALIGN (asm_out_file
, 2);
2884 fputs ("L_OBJC_ImageInfo:\n", asm_out_file
);
2886 flags
|= (flag_replace_objc_classes
&& classes_seen
) ? 1 : 0;
2887 flags
|= flag_objc_gc
? 2 : 0;
2889 fprintf (asm_out_file
, "\t.long\t0\n\t.long\t%u\n", flags
);
2892 machopic_finish (asm_out_file
);
2893 if (strcmp (lang_hooks
.name
, "GNU C++") == 0)
2895 switch_to_section (darwin_sections
[constructor_section
]);
2896 switch_to_section (darwin_sections
[destructor_section
]);
2897 ASM_OUTPUT_ALIGN (asm_out_file
, 1);
2900 /* If there was LTO assembler output, append it to asm_out_file. */
2901 if (lto_asm_out_name
)
2904 char *buf
, *lto_asm_txt
;
2906 /* Shouldn't be here if we failed to switch back. */
2907 gcc_assert (! saved_asm_out_file
);
2909 lto_asm_out_file
= fopen (lto_asm_out_name
, "r");
2910 if (lto_asm_out_file
== NULL
)
2911 fatal_error ("failed to open temporary file %s with LTO output",
2913 fseek (lto_asm_out_file
, 0, SEEK_END
);
2914 n
= ftell (lto_asm_out_file
);
2917 fseek (lto_asm_out_file
, 0, SEEK_SET
);
2918 lto_asm_txt
= buf
= (char *) xmalloc (n
+ 1);
2919 while (fgets (lto_asm_txt
, n
, lto_asm_out_file
))
2920 fputs (lto_asm_txt
, asm_out_file
);
2921 /* Put a termination label. */
2922 fprintf (asm_out_file
, "\t.section %s,%s,regular,debug\n",
2923 LTO_SEGMENT_NAME
, LTO_SECTS_SECTION
);
2924 fprintf (asm_out_file
, "L_GNU_LTO%d:\t;# end of lto\n",
2926 /* Make sure our termination label stays in this section. */
2927 fputs ("\t.space\t1\n", asm_out_file
);
2930 /* Remove the temporary file. */
2931 fclose (lto_asm_out_file
);
2932 unlink_if_ordinary (lto_asm_out_name
);
2933 free (lto_asm_out_name
);
2936 /* Output the names and indices. */
2937 if (lto_section_names
&& lto_section_names
->length ())
2940 darwin_lto_section_e
*ref
;
2941 /* For now, we'll make the offsets 4 bytes and unaligned - we'll fix
2942 the latter up ourselves. */
2943 const char *op
= integer_asm_op (4,0);
2945 /* Emit the names. */
2946 fprintf (asm_out_file
, "\t.section %s,%s,regular,debug\n",
2947 LTO_SEGMENT_NAME
, LTO_NAMES_SECTION
);
2948 FOR_EACH_VEC_ELT (*lto_section_names
, count
, ref
)
2950 fprintf (asm_out_file
, "L_GNU_LTO_NAME%d:\n", count
);
2951 /* We have to jump through hoops to get the values of the intra-section
2953 fprintf (asm_out_file
,
2954 "\t.set L$gnu$lto$noff%d,L_GNU_LTO_NAME%d-L_GNU_LTO_NAME0\n",
2956 fprintf (asm_out_file
,
2957 "\t.set L$gnu$lto$nsiz%d,L_GNU_LTO_NAME%d-L_GNU_LTO_NAME%d\n",
2958 count
, count
+1, count
);
2959 fprintf (asm_out_file
, "\t.asciz\t\"%s\"\n", ref
->sectname
);
2961 fprintf (asm_out_file
, "L_GNU_LTO_NAME%d:\t;# end\n", lto_section_num
);
2962 /* make sure our termination label stays in this section. */
2963 fputs ("\t.space\t1\n", asm_out_file
);
2965 /* Emit the Index. */
2966 fprintf (asm_out_file
, "\t.section %s,%s,regular,debug\n",
2967 LTO_SEGMENT_NAME
, LTO_INDEX_SECTION
);
2968 fputs ("\t.align\t2\n", asm_out_file
);
2969 fputs ("# Section offset, Section length, Name offset, Name length\n",
2971 FOR_EACH_VEC_ELT (*lto_section_names
, count
, ref
)
2973 fprintf (asm_out_file
, "%s L$gnu$lto$offs%d\t;# %s\n",
2974 op
, count
, ref
->sectname
);
2975 fprintf (asm_out_file
, "%s L$gnu$lto$size%d\n", op
, count
);
2976 fprintf (asm_out_file
, "%s L$gnu$lto$noff%d\n", op
, count
);
2977 fprintf (asm_out_file
, "%s L$gnu$lto$nsiz%d\n", op
, count
);
2981 /* If we have section anchors, then we must prevent the linker from
2982 re-arranging data. */
2983 if (!DARWIN_SECTION_ANCHORS
|| !flag_section_anchors
)
2984 fprintf (asm_out_file
, "\t.subsections_via_symbols\n");
2987 /* TODO: Add a language hook for identifying if a decl is a vtable. */
2988 #define DARWIN_VTABLE_P(DECL) 0
2990 /* Cross-module name binding. Darwin does not support overriding
2991 functions at dynamic-link time, except for vtables in kexts. */
2994 darwin_binds_local_p (const_tree decl
)
2996 return default_binds_local_p_1 (decl
,
2997 TARGET_KEXTABI
&& DARWIN_VTABLE_P (decl
));
3000 /* The Darwin's implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
3001 anchor relative to ".", the current section position. We cannot use
3002 the default one because ASM_OUTPUT_DEF is wrong for Darwin. */
3004 darwin_asm_output_anchor (rtx symbol
)
3006 fprintf (asm_out_file
, "\t.set\t");
3007 assemble_name (asm_out_file
, XSTR (symbol
, 0));
3008 fprintf (asm_out_file
, ", . + " HOST_WIDE_INT_PRINT_DEC
"\n",
3009 SYMBOL_REF_BLOCK_OFFSET (symbol
));
3012 /* Disable section anchoring on any section containing a zero-sized
3015 darwin_use_anchors_for_symbol_p (const_rtx symbol
)
3017 if (DARWIN_SECTION_ANCHORS
&& flag_section_anchors
)
3020 /* If the section contains a zero-sized object it's ineligible. */
3021 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
3022 /* This should have the effect of disabling anchors for vars that follow
3023 any zero-sized one, in a given section. */
3024 if (sect
->common
.flags
& SECTION_NO_ANCHOR
)
3027 /* Also check the normal reasons for suppressing. */
3028 return default_use_anchors_for_symbol_p (symbol
);
3034 /* Set the darwin specific attributes on TYPE. */
3036 darwin_set_default_type_attributes (tree type
)
3038 if (darwin_ms_struct
3039 && TREE_CODE (type
) == RECORD_TYPE
)
3040 TYPE_ATTRIBUTES (type
) = tree_cons (get_identifier ("ms_struct"),
3042 TYPE_ATTRIBUTES (type
));
3045 /* True, iff we're generating code for loadable kernel extensions. */
3048 darwin_kextabi_p (void) {
3049 return flag_apple_kext
;
3053 darwin_override_options (void)
3055 /* Keep track of which (major) version we're generating code for. */
3056 if (darwin_macosx_version_min
)
3058 if (strverscmp (darwin_macosx_version_min
, "10.6") >= 0)
3059 generating_for_darwin_version
= 10;
3060 else if (strverscmp (darwin_macosx_version_min
, "10.5") >= 0)
3061 generating_for_darwin_version
= 9;
3063 /* Earlier versions are not specifically accounted, until required. */
3066 /* In principle, this should be c-family only. However, we really need to
3067 set sensible defaults for LTO as well, since the section selection stuff
3068 should check for correctness re. the ABI. TODO: check and provide the
3069 flags (runtime & ABI) from the lto wrapper). */
3071 /* Unless set, force ABI=2 for NeXT and m64, 0 otherwise. */
3072 if (!global_options_set
.x_flag_objc_abi
)
3073 global_options
.x_flag_objc_abi
3074 = (!flag_next_runtime
)
3077 : (generating_for_darwin_version
>= 9) ? 1
3080 /* Objective-C family ABI 2 is only valid for next/m64 at present. */
3081 if (global_options_set
.x_flag_objc_abi
&& flag_next_runtime
)
3083 if (TARGET_64BIT
&& global_options
.x_flag_objc_abi
< 2)
3084 error_at (UNKNOWN_LOCATION
, "%<-fobjc-abi-version%> >= 2 must be"
3085 " used for %<-m64%> targets with"
3086 " %<-fnext-runtime%>");
3087 if (!TARGET_64BIT
&& global_options
.x_flag_objc_abi
>= 2)
3088 error_at (UNKNOWN_LOCATION
, "%<-fobjc-abi-version%> >= 2 is not"
3089 " supported on %<-m32%> targets with"
3090 " %<-fnext-runtime%>");
3093 /* Don't emit DWARF3/4 unless specifically selected. This is a
3094 workaround for tool bugs. */
3095 if (!global_options_set
.x_dwarf_strict
)
3097 if (!global_options_set
.x_dwarf_version
)
3100 /* Do not allow unwind tables to be generated by default for m32.
3101 fnon-call-exceptions will override this, regardless of what we do. */
3102 if (generating_for_darwin_version
< 10
3103 && !global_options_set
.x_flag_asynchronous_unwind_tables
3105 global_options
.x_flag_asynchronous_unwind_tables
= 0;
3107 /* Disable -freorder-blocks-and-partition when unwind tables are being
3108 emitted for Darwin < 9 (OSX 10.5).
3109 The strategy is, "Unless the User has specifically set/unset an unwind
3110 flag we will switch off -freorder-blocks-and-partition when unwind tables
3111 will be generated". If the User specifically sets flags... we assume
3112 (s)he knows why... */
3113 if (generating_for_darwin_version
< 9
3114 && global_options_set
.x_flag_reorder_blocks_and_partition
3115 && ((global_options
.x_flag_exceptions
/* User, c++, java */
3116 && !global_options_set
.x_flag_exceptions
) /* User specified... */
3117 || (global_options
.x_flag_unwind_tables
3118 && !global_options_set
.x_flag_unwind_tables
)
3119 || (global_options
.x_flag_non_call_exceptions
3120 && !global_options_set
.x_flag_non_call_exceptions
)
3121 || (global_options
.x_flag_asynchronous_unwind_tables
3122 && !global_options_set
.x_flag_asynchronous_unwind_tables
)))
3124 inform (input_location
,
3125 "-freorder-blocks-and-partition does not work with exceptions "
3126 "on this architecture");
3127 flag_reorder_blocks_and_partition
= 0;
3128 flag_reorder_blocks
= 1;
3131 /* FIXME: flag_objc_sjlj_exceptions is no longer needed since there is only
3132 one valid choice of exception scheme for each runtime. */
3133 if (!global_options_set
.x_flag_objc_sjlj_exceptions
)
3134 global_options
.x_flag_objc_sjlj_exceptions
=
3135 flag_next_runtime
&& !TARGET_64BIT
;
3137 /* FIXME: and this could be eliminated then too. */
3138 if (!global_options_set
.x_flag_exceptions
3139 && flag_objc_exceptions
3141 flag_exceptions
= 1;
3143 if (flag_mkernel
|| flag_apple_kext
)
3145 /* -mkernel implies -fapple-kext for C++ */
3146 if (strcmp (lang_hooks
.name
, "GNU C++") == 0)
3147 flag_apple_kext
= 1;
3151 /* No EH in kexts. */
3152 flag_exceptions
= 0;
3153 /* No -fnon-call-exceptions data in kexts. */
3154 flag_non_call_exceptions
= 0;
3155 /* so no tables either.. */
3156 flag_unwind_tables
= 0;
3157 flag_asynchronous_unwind_tables
= 0;
3158 /* We still need to emit branch islands for kernel context. */
3159 darwin_emit_branch_islands
= true;
3162 if (flag_var_tracking_uninit
== 0
3163 && generating_for_darwin_version
>= 9
3164 && (flag_gtoggle
? (debug_info_level
== DINFO_LEVEL_NONE
)
3165 : (debug_info_level
>= DINFO_LEVEL_NORMAL
))
3166 && write_symbols
== DWARF2_DEBUG
)
3167 flag_var_tracking_uninit
= flag_var_tracking
;
3169 if (MACHO_DYNAMIC_NO_PIC_P
)
3172 warning_at (UNKNOWN_LOCATION
, 0,
3173 "%<-mdynamic-no-pic%> overrides %<-fpic%>, %<-fPIC%>,"
3174 " %<-fpie%> or %<-fPIE%>");
3177 else if (flag_pic
== 1)
3179 /* Darwin's -fpic is -fPIC. */
3183 /* It is assumed that branch island stubs are needed for earlier systems. */
3184 if (generating_for_darwin_version
< 9)
3185 darwin_emit_branch_islands
= true;
3187 emit_aligned_common
= true; /* Later systems can support aligned common. */
3189 /* The c_dialect...() macros are not available to us here. */
3190 darwin_running_cxx
= (strstr (lang_hooks
.name
, "C++") != 0);
3194 /* Add $LDBL128 suffix to long double builtins for ppc darwin. */
3197 darwin_patch_builtin (enum built_in_function fncode
)
3199 tree fn
= builtin_decl_explicit (fncode
);
3206 sym
= DECL_ASSEMBLER_NAME (fn
);
3207 newname
= ACONCAT (("_", IDENTIFIER_POINTER (sym
), "$LDBL128", NULL
));
3209 set_user_assembler_name (fn
, newname
);
3211 fn
= builtin_decl_implicit (fncode
);
3213 set_user_assembler_name (fn
, newname
);
3217 darwin_patch_builtins (void)
3219 if (LONG_DOUBLE_TYPE_SIZE
!= 128)
3222 #define PATCH_BUILTIN(fncode) darwin_patch_builtin (fncode);
3223 #define PATCH_BUILTIN_NO64(fncode) \
3224 if (!TARGET_64BIT) \
3225 darwin_patch_builtin (fncode);
3226 #define PATCH_BUILTIN_VARIADIC(fncode) \
3228 && (strverscmp (darwin_macosx_version_min, "10.3.9") >= 0)) \
3229 darwin_patch_builtin (fncode);
3230 #include "darwin-ppc-ldouble-patch.def"
3231 #undef PATCH_BUILTIN
3232 #undef PATCH_BUILTIN_NO64
3233 #undef PATCH_BUILTIN_VARIADIC
3237 /* CFStrings implementation. */
3238 static GTY(()) tree cfstring_class_reference
= NULL_TREE
;
3239 static GTY(()) tree cfstring_type_node
= NULL_TREE
;
3240 static GTY(()) tree ccfstring_type_node
= NULL_TREE
;
3241 static GTY(()) tree pccfstring_type_node
= NULL_TREE
;
3242 static GTY(()) tree pcint_type_node
= NULL_TREE
;
3243 static GTY(()) tree pcchar_type_node
= NULL_TREE
;
3245 static enum built_in_function darwin_builtin_cfstring
;
3247 /* Store all constructed constant CFStrings in a hash table so that
3248 they get uniqued properly. */
3250 typedef struct GTY (()) cfstring_descriptor
{
3251 /* The string literal. */
3253 /* The resulting constant CFString. */
3255 } cfstring_descriptor
;
3257 static GTY ((param_is (struct cfstring_descriptor
))) htab_t cfstring_htab
;
3259 static hashval_t
cfstring_hash (const void *);
3260 static int cfstring_eq (const void *, const void *);
3263 add_builtin_field_decl (tree type
, const char *name
, tree
**chain
)
3265 tree field
= build_decl (BUILTINS_LOCATION
, FIELD_DECL
,
3266 get_identifier (name
), type
);
3270 *chain
= &DECL_CHAIN (field
);
3276 darwin_init_cfstring_builtins (unsigned builtin_cfstring
)
3278 tree cfsfun
, fields
, pccfstring_ftype_pcchar
;
3281 darwin_builtin_cfstring
=
3282 (enum built_in_function
) builtin_cfstring
;
3284 /* struct __builtin_CFString {
3285 const int *isa; (will point at
3286 int flags; __CFConstantStringClassReference)
3291 pcint_type_node
= build_pointer_type
3292 (build_qualified_type (integer_type_node
, TYPE_QUAL_CONST
));
3294 pcchar_type_node
= build_pointer_type
3295 (build_qualified_type (char_type_node
, TYPE_QUAL_CONST
));
3297 cfstring_type_node
= (*lang_hooks
.types
.make_type
) (RECORD_TYPE
);
3299 /* Have to build backwards for finish struct. */
3300 fields
= add_builtin_field_decl (long_integer_type_node
, "length", &chain
);
3301 add_builtin_field_decl (pcchar_type_node
, "str", &chain
);
3302 add_builtin_field_decl (integer_type_node
, "flags", &chain
);
3303 add_builtin_field_decl (pcint_type_node
, "isa", &chain
);
3304 finish_builtin_struct (cfstring_type_node
, "__builtin_CFString",
3307 /* const struct __builtin_CFstring *
3308 __builtin___CFStringMakeConstantString (const char *); */
3310 ccfstring_type_node
= build_qualified_type
3311 (cfstring_type_node
, TYPE_QUAL_CONST
);
3312 pccfstring_type_node
= build_pointer_type (ccfstring_type_node
);
3313 pccfstring_ftype_pcchar
= build_function_type_list
3314 (pccfstring_type_node
, pcchar_type_node
, NULL_TREE
);
3316 cfsfun
= build_decl (BUILTINS_LOCATION
, FUNCTION_DECL
,
3317 get_identifier ("__builtin___CFStringMakeConstantString"),
3318 pccfstring_ftype_pcchar
);
3320 TREE_PUBLIC (cfsfun
) = 1;
3321 DECL_EXTERNAL (cfsfun
) = 1;
3322 DECL_ARTIFICIAL (cfsfun
) = 1;
3323 /* Make a lang-specific section - dup_lang_specific_decl makes a new node
3324 in place of the existing, which may be NULL. */
3325 DECL_LANG_SPECIFIC (cfsfun
) = NULL
;
3326 (*lang_hooks
.dup_lang_specific_decl
) (cfsfun
);
3327 DECL_BUILT_IN_CLASS (cfsfun
) = BUILT_IN_MD
;
3328 DECL_FUNCTION_CODE (cfsfun
) = darwin_builtin_cfstring
;
3329 lang_hooks
.builtin_function (cfsfun
);
3331 /* extern int __CFConstantStringClassReference[]; */
3332 cfstring_class_reference
= build_decl (BUILTINS_LOCATION
, VAR_DECL
,
3333 get_identifier ("__CFConstantStringClassReference"),
3334 build_array_type (integer_type_node
, NULL_TREE
));
3336 TREE_PUBLIC (cfstring_class_reference
) = 1;
3337 DECL_ARTIFICIAL (cfstring_class_reference
) = 1;
3338 (*lang_hooks
.decls
.pushdecl
) (cfstring_class_reference
);
3339 DECL_EXTERNAL (cfstring_class_reference
) = 1;
3340 rest_of_decl_compilation (cfstring_class_reference
, 0, 0);
3342 /* Initialize the hash table used to hold the constant CFString objects. */
3343 cfstring_htab
= htab_create_ggc (31, cfstring_hash
, cfstring_eq
, NULL
);
3345 return cfstring_type_node
;
3349 darwin_fold_builtin (tree fndecl
, int n_args
, tree
*argp
,
3350 bool ARG_UNUSED (ignore
))
3352 unsigned int fcode
= DECL_FUNCTION_CODE (fndecl
);
3354 if (fcode
== darwin_builtin_cfstring
)
3356 if (!darwin_constant_cfstrings
)
3358 error ("built-in function %qD requires the"
3359 " %<-mconstant-cfstrings%> flag", fndecl
);
3360 return error_mark_node
;
3365 error ("built-in function %qD takes one argument only", fndecl
);
3366 return error_mark_node
;
3369 return darwin_build_constant_cfstring (*argp
);
3376 darwin_rename_builtins (void)
3378 /* The system ___divdc3 routine in libSystem on darwin10 is not
3379 accurate to 1ulp, ours is, so we avoid ever using the system name
3380 for this routine and instead install a non-conflicting name that
3383 When -ffast-math or -funsafe-math-optimizations is given, we can
3384 use the faster version. */
3385 if (!flag_unsafe_math_optimizations
)
3387 enum built_in_function dcode
3388 = (enum built_in_function
)(BUILT_IN_COMPLEX_DIV_MIN
3389 + DCmode
- MIN_MODE_COMPLEX_FLOAT
);
3390 tree fn
= builtin_decl_explicit (dcode
);
3391 /* Fortran and c call TARGET_INIT_BUILTINS and
3392 TARGET_INIT_LIBFUNCS at different times, so we have to put a
3393 call into each to ensure that at least one of them is called
3394 after build_common_builtin_nodes. A better fix is to add a
3395 new hook to run after build_common_builtin_nodes runs. */
3397 set_user_assembler_name (fn
, "___ieee_divdc3");
3398 fn
= builtin_decl_implicit (dcode
);
3400 set_user_assembler_name (fn
, "___ieee_divdc3");
3405 darwin_libc_has_function (enum function_class fn_class
)
3407 if (fn_class
== function_sincos
)
3409 if (fn_class
== function_c99_math_complex
3410 || fn_class
== function_c99_misc
)
3411 return (TARGET_64BIT
3412 || strverscmp (darwin_macosx_version_min
, "10.3") >= 0);
3418 cfstring_hash (const void *ptr
)
3420 tree str
= ((const struct cfstring_descriptor
*)ptr
)->literal
;
3421 const unsigned char *p
= (const unsigned char *) TREE_STRING_POINTER (str
);
3422 int i
, len
= TREE_STRING_LENGTH (str
);
3425 for (i
= 0; i
< len
; i
++)
3426 h
= ((h
* 613) + p
[i
]);
3432 cfstring_eq (const void *ptr1
, const void *ptr2
)
3434 tree str1
= ((const struct cfstring_descriptor
*)ptr1
)->literal
;
3435 tree str2
= ((const struct cfstring_descriptor
*)ptr2
)->literal
;
3436 int len1
= TREE_STRING_LENGTH (str1
);
3438 return (len1
== TREE_STRING_LENGTH (str2
)
3439 && !memcmp (TREE_STRING_POINTER (str1
), TREE_STRING_POINTER (str2
),
3444 darwin_build_constant_cfstring (tree str
)
3446 struct cfstring_descriptor
*desc
, key
;
3452 error ("CFString literal is missing");
3453 return error_mark_node
;
3458 if (TREE_CODE (str
) == ADDR_EXPR
)
3459 str
= TREE_OPERAND (str
, 0);
3461 if (TREE_CODE (str
) != STRING_CST
)
3463 error ("CFString literal expression is not a string constant");
3464 return error_mark_node
;
3467 /* Perhaps we already constructed a constant CFString just like this one? */
3469 loc
= htab_find_slot (cfstring_htab
, &key
, INSERT
);
3470 desc
= (struct cfstring_descriptor
*) *loc
;
3474 tree var
, constructor
, field
;
3475 vec
<constructor_elt
, va_gc
> *v
= NULL
;
3476 int length
= TREE_STRING_LENGTH (str
) - 1;
3478 if (darwin_warn_nonportable_cfstrings
)
3480 const char *s
= TREE_STRING_POINTER (str
);
3483 for (l
= 0; l
< length
; l
++)
3484 if (!s
[l
] || !isascii (s
[l
]))
3486 warning (darwin_warn_nonportable_cfstrings
, "%s in CFString literal",
3487 s
[l
] ? "non-ASCII character" : "embedded NUL");
3492 *loc
= desc
= ggc_alloc_cleared_cfstring_descriptor ();
3493 desc
->literal
= str
;
3496 field
= TYPE_FIELDS (ccfstring_type_node
);
3497 CONSTRUCTOR_APPEND_ELT(v
, NULL_TREE
,
3498 build1 (ADDR_EXPR
, TREE_TYPE (field
),
3499 cfstring_class_reference
));
3501 field
= DECL_CHAIN (field
);
3502 CONSTRUCTOR_APPEND_ELT(v
, NULL_TREE
,
3503 build_int_cst (TREE_TYPE (field
), 0x000007c8));
3505 field
= DECL_CHAIN (field
);
3506 CONSTRUCTOR_APPEND_ELT(v
, NULL_TREE
,
3507 build1 (ADDR_EXPR
, TREE_TYPE (field
), str
));
3509 field
= DECL_CHAIN (field
);
3510 CONSTRUCTOR_APPEND_ELT(v
, NULL_TREE
,
3511 build_int_cst (TREE_TYPE (field
), length
));
3513 constructor
= build_constructor (ccfstring_type_node
, v
);
3514 TREE_READONLY (constructor
) = 1;
3515 TREE_CONSTANT (constructor
) = 1;
3516 TREE_STATIC (constructor
) = 1;
3518 /* Fromage: The C++ flavor of 'build_unary_op' expects constructor nodes
3519 to have the TREE_HAS_CONSTRUCTOR (...) bit set. However, this file is
3520 being built without any knowledge of C++ tree accessors; hence, we shall
3521 use the generic accessor that TREE_HAS_CONSTRUCTOR actually maps to! */
3522 if (darwin_running_cxx
)
3523 TREE_LANG_FLAG_4 (constructor
) = 1; /* TREE_HAS_CONSTRUCTOR */
3525 /* Create an anonymous global variable for this CFString. */
3526 var
= build_decl (input_location
, CONST_DECL
,
3527 NULL
, TREE_TYPE (constructor
));
3528 DECL_ARTIFICIAL (var
) = 1;
3529 TREE_STATIC (var
) = 1;
3530 DECL_INITIAL (var
) = constructor
;
3531 /* FIXME: This should use a translation_unit_decl to indicate file scope. */
3532 DECL_CONTEXT (var
) = NULL_TREE
;
3533 desc
->constructor
= var
;
3536 addr
= build1 (ADDR_EXPR
, pccfstring_type_node
, desc
->constructor
);
3537 TREE_CONSTANT (addr
) = 1;
3543 darwin_cfstring_p (tree str
)
3545 struct cfstring_descriptor key
;
3553 if (TREE_CODE (str
) == ADDR_EXPR
)
3554 str
= TREE_OPERAND (str
, 0);
3556 if (TREE_CODE (str
) != STRING_CST
)
3560 loc
= htab_find_slot (cfstring_htab
, &key
, NO_INSERT
);
3569 darwin_enter_string_into_cfstring_table (tree str
)
3571 struct cfstring_descriptor key
;
3575 loc
= htab_find_slot (cfstring_htab
, &key
, INSERT
);
3579 *loc
= ggc_alloc_cleared_cfstring_descriptor ();
3580 ((struct cfstring_descriptor
*)*loc
)->literal
= str
;
3584 /* Choose named function section based on its frequency. */
3587 darwin_function_section (tree decl
, enum node_frequency freq
,
3588 bool startup
, bool exit
)
3590 /* Decide if we need to put this in a coalescable section. */
3593 && (!DECL_ATTRIBUTES (decl
)
3594 || !lookup_attribute ("weak_import",
3595 DECL_ATTRIBUTES (decl
))));
3597 /* If there is a specified section name, we should not be trying to
3599 if (decl
&& DECL_SECTION_NAME (decl
) != NULL_TREE
)
3600 return get_named_section (decl
, NULL
, 0);
3602 /* Default when there is no function re-ordering. */
3603 if (!flag_reorder_functions
)
3605 ? darwin_sections
[text_coal_section
]
3608 /* Startup code should go to startup subsection unless it is
3609 unlikely executed (this happens especially with function splitting
3610 where we can split away unnecessary parts of static constructors). */
3611 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
3613 ? darwin_sections
[text_startup_coal_section
]
3614 : darwin_sections
[text_startup_section
];
3616 /* Similarly for exit. */
3617 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
3619 ? darwin_sections
[text_exit_coal_section
]
3620 : darwin_sections
[text_exit_section
];
3622 /* Group cold functions together, similarly for hot code. */
3625 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
3627 ? darwin_sections
[text_cold_coal_section
]
3628 : darwin_sections
[text_cold_section
];
3630 case NODE_FREQUENCY_HOT
:
3632 ? darwin_sections
[text_hot_coal_section
]
3633 : darwin_sections
[text_hot_section
];
3637 ? darwin_sections
[text_coal_section
]
3643 /* When a function is partitioned between sections, we need to insert a label
3644 at the start of each new chunk - so that it may become a valid 'atom' for
3645 eh and debug purposes. Without this the linker will emit warnings if one
3646 tries to add line location information (since the switched fragment will
3650 darwin_function_switched_text_sections (FILE *fp
, tree decl
, bool new_is_cold
)
3653 snprintf (buf
, 128, "%s%s",new_is_cold
?"__cold_sect_of_":"__hot_sect_of_",
3654 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3655 /* Make sure we pick up all the relevant quotes etc. */
3656 assemble_name_raw (fp
, (const char *) buf
);
3660 #include "gt-darwin.h"