1 /* Functions for generic Darwin as target machine for GNU C compiler.
2 Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
5 Contributed by Apple Computer Inc.
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
25 #include "coretypes.h"
29 #include "hard-reg-set.h"
30 #include "insn-config.h"
31 #include "conditions.h"
32 #include "insn-flags.h"
34 #include "insn-attr.h"
41 #include "langhooks.h"
44 #include "diagnostic-core.h"
50 #include "lto-streamer.h"
52 /* Darwin supports a feature called fix-and-continue, which is used
53 for rapid turn around debugging. When code is compiled with the
54 -mfix-and-continue flag, two changes are made to the generated code
55 that allow the system to do things that it would normally not be
56 able to do easily. These changes allow gdb to load in
57 recompilation of a translation unit that has been changed into a
58 running program and replace existing functions and methods of that
59 translation unit with versions of those functions and methods
60 from the newly compiled translation unit. The new functions access
61 the existing static symbols from the old translation unit, if the
62 symbol existed in the unit to be replaced, and from the new
63 translation unit, otherwise.
65 The changes are to insert 5 nops at the beginning of all functions
66 and to use indirection to get at static symbols. The 5 nops
67 are required by consumers of the generated code. Currently, gdb
68 uses this to patch in a jump to the overriding function, this
69 allows all uses of the old name to forward to the replacement,
70 including existing function pointers and virtual methods. See
71 rs6000_emit_prologue for the code that handles the nop insertions.
73 The added indirection allows gdb to redirect accesses to static
74 symbols from the newly loaded translation unit to the existing
75 symbol, if any. @code{static} symbols are special and are handled by
76 setting the second word in the .non_lazy_symbol_pointer data
77 structure to symbol. See indirect_data for the code that handles
78 the extra indirection, and machopic_output_indirection and its use
79 of MACHO_SYMBOL_STATIC for the code that handles @code{static}
80 symbol indirection. */
82 /* For darwin >= 9 (OSX 10.5) the linker is capable of making the necessary
83 branch islands and we no longer need to emit darwin stubs.
84 However, if we are generating code for earlier systems (or for use in the
85 kernel) the stubs might still be required, and this will be set true. */
86 int darwin_emit_branch_islands = false;
88 /* A flag to determine whether we are running c++ or obj-c++. This has to be
89 settable from non-c-family contexts too (i.e. we can't use the c_dialect_
91 int darwin_running_cxx;
93 /* Some code-gen now depends on OS major version numbers (at least). */
94 int generating_for_darwin_version ;
97 section * darwin_sections[NUM_DARWIN_SECTIONS];
99 /* While we transition to using in-tests instead of ifdef'd code. */
101 #define HAVE_lo_sum 0
102 #define gen_macho_high(a,b) (a)
103 #define gen_macho_low(a,b,c) (a)
106 /* True if we're setting __attribute__ ((ms_struct)). */
107 int darwin_ms_struct = false;
109 /* Earlier versions of Darwin as do not recognize an alignment field in
110 .comm directives, this should be set for versions that allow it. */
111 int emit_aligned_common = false;
113 /* A get_unnamed_section callback used to switch to an ObjC section.
114 DIRECTIVE is as for output_section_asm_op. */
117 output_objc_section_asm_op (const void *directive)
119 static bool been_here = false;
121 /* The NeXT ObjC Runtime requires these sections to be present and in
122 order in the object. The code below implements this by emitting
123 a section header for each ObjC section the first time that an ObjC
124 section is requested. */
127 section *saved_in_section = in_section;
128 static const enum darwin_section_enum tomark[] =
130 /* written, cold -> hot */
131 objc_cat_cls_meth_section,
132 objc_cat_inst_meth_section,
133 objc_string_object_section,
134 objc_constant_string_object_section,
135 objc_selector_refs_section,
136 objc_selector_fixup_section,
137 objc_cls_refs_section,
139 objc_meta_class_section,
140 /* shared, hot -> cold */
141 objc_cls_meth_section,
142 objc_inst_meth_section,
143 objc_protocol_section,
144 objc_class_names_section,
145 objc_meth_var_types_section,
146 objc_meth_var_names_section,
147 objc_category_section,
148 objc_class_vars_section,
149 objc_instance_vars_section,
150 objc_module_info_section,
151 objc_symbols_section,
154 static const enum darwin_section_enum tomarkv1[] =
156 objc1_protocol_ext_section,
157 objc1_class_ext_section,
158 objc1_prop_list_section
161 static const enum darwin_section_enum tomarkv2[] =
163 objc2_message_refs_section,
164 objc2_classdefs_section,
165 objc2_metadata_section,
166 objc2_classrefs_section,
167 objc2_classlist_section,
168 objc2_categorylist_section,
169 objc2_selector_refs_section,
170 objc2_nonlazy_class_section,
171 objc2_nonlazy_category_section,
172 objc2_protocollist_section,
173 objc2_protocolrefs_section,
174 objc2_super_classrefs_section,
175 objc2_image_info_section,
176 objc2_constant_string_object_section
181 if (flag_objc_abi < 2)
183 for (i = 0; i < ARRAY_SIZE (tomark); i++)
184 switch_to_section (darwin_sections[tomark[i]]);
185 if (flag_objc_abi == 1)
186 for (i = 0; i < ARRAY_SIZE (tomarkv1); i++)
187 switch_to_section (darwin_sections[tomarkv1[i]]);
190 for (i = 0; i < ARRAY_SIZE (tomarkv2); i++)
191 switch_to_section (darwin_sections[tomarkv2[i]]);
192 /* Make sure we don't get varasm.c out of sync with us. */
193 switch_to_section (saved_in_section);
195 output_section_asm_op (directive);
199 /* Private flag applied to disable section-anchors in a particular section. */
200 #define SECTION_NO_ANCHOR SECTION_MACH_DEP
203 /* Implement TARGET_ASM_INIT_SECTIONS. */
206 darwin_init_sections (void)
208 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) \
209 darwin_sections[NAME] = \
210 get_unnamed_section (FLAGS, (OBJC \
211 ? output_objc_section_asm_op \
212 : output_section_asm_op), \
214 #include "config/darwin-sections.def"
217 readonly_data_section = darwin_sections[const_section];
218 exception_section = darwin_sections[darwin_exception_section];
219 eh_frame_section = darwin_sections[darwin_eh_frame_section];
223 name_needs_quotes (const char *name)
226 while ((c = *name++) != '\0')
228 && c != '.' && c != '$' && c != '_' )
233 /* Return true if SYM_REF can be used without an indirection. */
235 machopic_symbol_defined_p (rtx sym_ref)
237 if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED)
240 /* If a symbol references local and is not an extern to this
241 file, then the symbol might be able to declared as defined. */
242 if (SYMBOL_REF_LOCAL_P (sym_ref) && ! SYMBOL_REF_EXTERNAL_P (sym_ref))
244 /* If the symbol references a variable and the variable is a
245 common symbol, then this symbol is not defined. */
246 if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_VARIABLE)
248 tree decl = SYMBOL_REF_DECL (sym_ref);
251 if (DECL_COMMON (decl))
259 /* This module assumes that (const (symbol_ref "foo")) is a legal pic
260 reference, which will not be changed. */
262 enum machopic_addr_class
263 machopic_classify_symbol (rtx sym_ref)
267 function_p = SYMBOL_REF_FUNCTION_P (sym_ref);
268 if (machopic_symbol_defined_p (sym_ref))
270 ? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA);
273 ? MACHOPIC_UNDEFINED_FUNCTION : MACHOPIC_UNDEFINED_DATA);
276 #ifndef TARGET_FIX_AND_CONTINUE
277 #define TARGET_FIX_AND_CONTINUE 0
280 /* Indicate when fix-and-continue style code generation is being used
281 and when a reference to data should be indirected so that it can be
282 rebound in a new translation unit to reference the original instance
283 of that data. Symbol names that are for code generation local to
284 the translation unit are bound to the new translation unit;
285 currently this means symbols that begin with L or _OBJC_;
286 otherwise, we indicate that an indirect reference should be made to
287 permit the runtime to rebind new instances of the translation unit
288 to the original instance of the data. */
291 indirect_data (rtx sym_ref)
296 /* If we aren't generating fix-and-continue code, don't do anything
298 if (TARGET_FIX_AND_CONTINUE == 0)
301 /* Otherwise, all symbol except symbols that begin with L or _OBJC_
302 are indirected. Symbols that begin with L and _OBJC_ are always
303 bound to the current translation unit as they are used for
304 generated local data of the translation unit. */
306 name = XSTR (sym_ref, 0);
308 lprefix = (((name[0] == '*' || name[0] == '&')
309 && (name[1] == 'L' || (name[1] == '"' && name[2] == 'L')))
310 || (strncmp (name, "_OBJC_", 6) == 0));
316 machopic_data_defined_p (rtx sym_ref)
318 if (indirect_data (sym_ref))
321 switch (machopic_classify_symbol (sym_ref))
323 case MACHOPIC_DEFINED_DATA:
324 case MACHOPIC_DEFINED_FUNCTION:
332 machopic_define_symbol (rtx mem)
336 gcc_assert (GET_CODE (mem) == MEM);
337 sym_ref = XEXP (mem, 0);
338 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
341 /* Return either ORIG or:
343 (const:P (unspec:P [ORIG] UNSPEC_MACHOPIC_OFFSET))
345 depending on MACHO_DYNAMIC_NO_PIC_P. */
347 machopic_gen_offset (rtx orig)
349 if (MACHO_DYNAMIC_NO_PIC_P)
353 /* Play games to avoid marking the function as needing pic if we
354 are being called as part of the cost-estimation process. */
355 if (current_ir_type () != IR_GIMPLE || currently_expanding_to_rtl)
356 crtl->uses_pic_offset_table = 1;
357 orig = gen_rtx_UNSPEC (Pmode, gen_rtvec (1, orig),
358 UNSPEC_MACHOPIC_OFFSET);
359 return gen_rtx_CONST (Pmode, orig);
363 static GTY(()) const char * function_base_func_name;
364 static GTY(()) int current_pic_label_num;
367 machopic_output_function_base_name (FILE *file)
369 const char *current_name;
371 /* If dynamic-no-pic is on, we should not get here. */
372 gcc_assert (!MACHO_DYNAMIC_NO_PIC_P);
373 /* When we are generating _get_pc thunks within stubs, there is no current
375 if (current_function_decl)
378 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
379 if (function_base_func_name != current_name)
381 ++current_pic_label_num;
382 function_base_func_name = current_name;
387 ++current_pic_label_num;
388 function_base_func_name = "L_machopic_stub_dummy";
390 fprintf (file, "L%011d$pb", current_pic_label_num);
393 /* The suffix attached to non-lazy pointer symbols. */
394 #define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr"
395 /* The suffix attached to stub symbols. */
396 #define STUB_SUFFIX "$stub"
398 typedef struct GTY (()) machopic_indirection
400 /* The SYMBOL_REF for the entity referenced. */
402 /* The name of the stub or non-lazy pointer. */
403 const char * ptr_name;
404 /* True iff this entry is for a stub (as opposed to a non-lazy
407 /* True iff this stub or pointer pointer has been referenced. */
409 } machopic_indirection;
411 /* A table mapping stub names and non-lazy pointer names to
412 SYMBOL_REFs for the stubbed-to and pointed-to entities. */
414 static GTY ((param_is (struct machopic_indirection))) htab_t
415 machopic_indirections;
417 /* Return a hash value for a SLOT in the indirections hash table. */
420 machopic_indirection_hash (const void *slot)
422 const machopic_indirection *p = (const machopic_indirection *) slot;
423 return htab_hash_string (p->ptr_name);
426 /* Returns true if the KEY is the same as that associated with
430 machopic_indirection_eq (const void *slot, const void *key)
432 return strcmp (((const machopic_indirection *) slot)->ptr_name,
433 (const char *) key) == 0;
436 /* Return the name of the non-lazy pointer (if STUB_P is false) or
437 stub (if STUB_B is true) corresponding to the given name. */
440 machopic_indirection_name (rtx sym_ref, bool stub_p)
443 const char *name = XSTR (sym_ref, 0);
444 size_t namelen = strlen (name);
445 machopic_indirection *p;
449 const char *prefix = user_label_prefix;
450 const char *quote = "";
453 id = maybe_get_identifier (name);
458 while (IDENTIFIER_TRANSPARENT_ALIAS (id))
459 id = TREE_CHAIN (id);
462 name = IDENTIFIER_POINTER (id);
463 namelen = strlen (name);
474 needs_quotes = name_needs_quotes (name);
481 suffix = STUB_SUFFIX;
483 suffix = NON_LAZY_POINTER_SUFFIX;
485 buffer = XALLOCAVEC (char, strlen ("&L")
492 /* Construct the name of the non-lazy pointer or stub. */
493 sprintf (buffer, "&%sL%s%s%s%s", quote, prefix, name, suffix, quote);
495 if (!machopic_indirections)
496 machopic_indirections = htab_create_ggc (37,
497 machopic_indirection_hash,
498 machopic_indirection_eq,
501 slot = htab_find_slot_with_hash (machopic_indirections, buffer,
502 htab_hash_string (buffer), INSERT);
505 p = (machopic_indirection *) *slot;
509 p = ggc_alloc_machopic_indirection ();
511 p->ptr_name = xstrdup (buffer);
520 /* Return the name of the stub for the mcount function. */
523 machopic_mcount_stub_name (void)
525 rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "*mcount");
526 return machopic_indirection_name (symbol, /*stub_p=*/true);
529 /* If NAME is the name of a stub or a non-lazy pointer , mark the stub
530 or non-lazy pointer as used -- and mark the object to which the
531 pointer/stub refers as used as well, since the pointer/stub will
532 emit a reference to it. */
535 machopic_validate_stub_or_non_lazy_ptr (const char *name)
537 machopic_indirection *p;
539 p = ((machopic_indirection *)
540 (htab_find_with_hash (machopic_indirections, name,
541 htab_hash_string (name))));
544 const char *real_name;
549 /* Do what output_addr_const will do when we actually call it. */
550 if (SYMBOL_REF_DECL (p->symbol))
551 mark_decl_referenced (SYMBOL_REF_DECL (p->symbol));
553 real_name = targetm.strip_name_encoding (XSTR (p->symbol, 0));
555 id = maybe_get_identifier (real_name);
557 mark_referenced (id);
561 /* Transform ORIG, which may be any data source, to the corresponding
562 source using indirections. */
565 machopic_indirect_data_reference (rtx orig, rtx reg)
569 if (! MACHOPIC_INDIRECT)
572 if (GET_CODE (orig) == SYMBOL_REF)
574 int defined = machopic_data_defined_p (orig);
576 if (defined && MACHO_DYNAMIC_NO_PIC_P)
580 /* Create a new register for CSE opportunities. */
581 rtx hi_reg = (!can_create_pseudo_p () ? reg : gen_reg_rtx (Pmode));
582 emit_insn (gen_macho_high (hi_reg, orig));
583 emit_insn (gen_macho_low (reg, hi_reg, orig));
589 /* some other cpu -- writeme! */
595 if (DARWIN_PPC || HAVE_lo_sum)
596 offset = machopic_gen_offset (orig);
600 rtx hi_sum_reg = (!can_create_pseudo_p ()
602 : gen_reg_rtx (Pmode));
606 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
607 gen_rtx_PLUS (Pmode, pic_offset_table_rtx,
608 gen_rtx_HIGH (Pmode, offset))));
609 emit_insn (gen_rtx_SET (Pmode, reg,
610 gen_rtx_LO_SUM (Pmode, hi_sum_reg,
611 copy_rtx (offset))));
615 else if (HAVE_lo_sum)
619 emit_insn (gen_rtx_SET (VOIDmode, reg,
620 gen_rtx_HIGH (Pmode, offset)));
621 emit_insn (gen_rtx_SET (VOIDmode, reg,
622 gen_rtx_LO_SUM (Pmode, reg,
623 copy_rtx (offset))));
624 emit_use (pic_offset_table_rtx);
626 orig = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, reg);
631 ptr_ref = (gen_rtx_SYMBOL_REF
633 machopic_indirection_name (orig, /*stub_p=*/false)));
635 SYMBOL_REF_DATA (ptr_ref) = SYMBOL_REF_DATA (orig);
637 ptr_ref = gen_const_mem (Pmode, ptr_ref);
638 machopic_define_symbol (ptr_ref);
642 && MACHO_DYNAMIC_NO_PIC_P)
644 emit_insn (gen_rtx_SET (Pmode, reg, ptr_ref));
650 else if (GET_CODE (orig) == CONST)
652 /* If "(const (plus ...", walk the PLUS and return that result.
653 PLUS processing (below) will restore the "(const ..." if
655 if (GET_CODE (XEXP (orig, 0)) == PLUS)
656 return machopic_indirect_data_reference (XEXP (orig, 0), reg);
660 else if (GET_CODE (orig) == MEM)
663 machopic_indirect_data_reference (XEXP (orig, 0), reg);
666 else if (GET_CODE (orig) == PLUS)
669 /* When the target is i386, this code prevents crashes due to the
670 compiler's ignorance on how to move the PIC base register to
671 other registers. (The reload phase sometimes introduces such
673 if (GET_CODE (XEXP (orig, 0)) == REG
674 && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM
675 /* Prevent the same register from being erroneously used
676 as both the base and index registers. */
677 && (DARWIN_X86 && (GET_CODE (XEXP (orig, 1)) == CONST))
680 emit_move_insn (reg, XEXP (orig, 0));
681 XEXP (ptr_ref, 0) = reg;
685 /* Legitimize both operands of the PLUS. */
686 base = machopic_indirect_data_reference (XEXP (orig, 0), reg);
687 orig = machopic_indirect_data_reference (XEXP (orig, 1),
688 (base == reg ? 0 : reg));
689 if (MACHOPIC_INDIRECT && (GET_CODE (orig) == CONST_INT))
690 result = plus_constant (base, INTVAL (orig));
692 result = gen_rtx_PLUS (Pmode, base, orig);
694 if (MACHOPIC_JUST_INDIRECT && GET_CODE (base) == MEM)
698 emit_move_insn (reg, result);
703 result = force_reg (GET_MODE (result), result);
712 /* Transform TARGET (a MEM), which is a function call target, to the
713 corresponding symbol_stub if necessary. Return a new MEM. */
716 machopic_indirect_call_target (rtx target)
718 if (! darwin_emit_branch_islands)
721 if (GET_CODE (target) != MEM)
724 if (MACHOPIC_INDIRECT
725 && GET_CODE (XEXP (target, 0)) == SYMBOL_REF
726 && !(SYMBOL_REF_FLAGS (XEXP (target, 0))
727 & MACHO_SYMBOL_FLAG_DEFINED))
729 rtx sym_ref = XEXP (target, 0);
730 const char *stub_name = machopic_indirection_name (sym_ref,
732 enum machine_mode mode = GET_MODE (sym_ref);
734 XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name);
735 SYMBOL_REF_DATA (XEXP (target, 0)) = SYMBOL_REF_DATA (sym_ref);
736 MEM_READONLY_P (target) = 1;
737 MEM_NOTRAP_P (target) = 1;
744 machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg)
748 if (! MACHOPIC_INDIRECT)
751 /* First handle a simple SYMBOL_REF or LABEL_REF */
752 if (GET_CODE (orig) == LABEL_REF
753 || (GET_CODE (orig) == SYMBOL_REF
756 /* addr(foo) = &func+(foo-func) */
757 orig = machopic_indirect_data_reference (orig, reg);
759 if (GET_CODE (orig) == PLUS
760 && GET_CODE (XEXP (orig, 0)) == REG)
763 return force_reg (mode, orig);
765 emit_move_insn (reg, orig);
769 if (GET_CODE (orig) == MEM)
773 gcc_assert (!reload_in_progress);
774 reg = gen_reg_rtx (Pmode);
778 if (MACHO_DYNAMIC_NO_PIC_P
779 && (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
780 || GET_CODE (XEXP (orig, 0)) == LABEL_REF))
782 #if defined (TARGET_TOC) /* ppc */
783 rtx temp_reg = (!can_create_pseudo_p ()
785 gen_reg_rtx (Pmode));
786 rtx asym = XEXP (orig, 0);
789 emit_insn (gen_macho_high (temp_reg, asym));
790 mem = gen_const_mem (GET_MODE (orig),
791 gen_rtx_LO_SUM (Pmode, temp_reg,
793 emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
795 /* Some other CPU -- WriteMe! but right now there are no other
796 platforms that can use dynamic-no-pic */
802 if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
803 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
805 rtx offset = machopic_gen_offset (XEXP (orig, 0));
806 #if defined (TARGET_TOC) /* i.e., PowerPC */
807 /* Generating a new reg may expose opportunities for
808 common subexpression elimination. */
809 rtx hi_sum_reg = (!can_create_pseudo_p ()
811 : gen_reg_rtx (Pmode));
816 sum = gen_rtx_HIGH (Pmode, offset);
817 if (! MACHO_DYNAMIC_NO_PIC_P)
818 sum = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, sum);
820 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, sum));
822 mem = gen_const_mem (GET_MODE (orig),
823 gen_rtx_LO_SUM (Pmode,
826 insn = emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
827 set_unique_reg_note (insn, REG_EQUAL, pic_ref);
831 emit_use (gen_rtx_REG (Pmode, PIC_OFFSET_TABLE_REGNUM));
833 emit_insn (gen_rtx_SET (VOIDmode, reg,
835 gen_rtx_CONST (Pmode,
837 emit_insn (gen_rtx_SET (VOIDmode, reg,
838 gen_rtx_LO_SUM (Pmode, reg,
839 gen_rtx_CONST (Pmode,
840 copy_rtx (offset)))));
841 pic_ref = gen_rtx_PLUS (Pmode,
842 pic_offset_table_rtx, reg);
846 #endif /* HAVE_lo_sum */
848 rtx pic = pic_offset_table_rtx;
849 if (GET_CODE (pic) != REG)
851 emit_move_insn (reg, pic);
855 emit_use (gen_rtx_REG (Pmode, PIC_OFFSET_TABLE_REGNUM));
858 if (reload_in_progress)
859 df_set_regs_ever_live (REGNO (pic), true);
860 pic_ref = gen_rtx_PLUS (Pmode, pic,
861 machopic_gen_offset (XEXP (orig, 0)));
864 #if !defined (TARGET_TOC)
865 emit_move_insn (reg, pic_ref);
866 pic_ref = gen_const_mem (GET_MODE (orig), reg);
873 if (GET_CODE (orig) == SYMBOL_REF
874 || GET_CODE (orig) == LABEL_REF)
876 rtx offset = machopic_gen_offset (orig);
877 #if defined (TARGET_TOC) /* i.e., PowerPC */
882 gcc_assert (!reload_in_progress);
883 reg = gen_reg_rtx (Pmode);
888 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
889 (MACHO_DYNAMIC_NO_PIC_P)
890 ? gen_rtx_HIGH (Pmode, offset)
891 : gen_rtx_PLUS (Pmode,
892 pic_offset_table_rtx,
895 emit_insn (gen_rtx_SET (VOIDmode, reg,
896 gen_rtx_LO_SUM (Pmode,
898 copy_rtx (offset))));
901 emit_insn (gen_rtx_SET (VOIDmode, reg,
902 gen_rtx_HIGH (Pmode, offset)));
903 emit_insn (gen_rtx_SET (VOIDmode, reg,
904 gen_rtx_LO_SUM (Pmode, reg,
905 copy_rtx (offset))));
906 pic_ref = gen_rtx_PLUS (Pmode,
907 pic_offset_table_rtx, reg);
911 #endif /* HAVE_lo_sum */
914 || GET_CODE (orig) == SUBREG)
920 rtx pic = pic_offset_table_rtx;
921 if (GET_CODE (pic) != REG)
923 emit_move_insn (reg, pic);
927 emit_use (pic_offset_table_rtx);
929 if (reload_in_progress)
930 df_set_regs_ever_live (REGNO (pic), true);
931 pic_ref = gen_rtx_PLUS (Pmode,
933 machopic_gen_offset (orig));
938 if (GET_CODE (pic_ref) != REG)
942 emit_move_insn (reg, pic_ref);
947 return force_reg (mode, pic_ref);
956 else if (GET_CODE (orig) == SYMBOL_REF)
959 else if (GET_CODE (orig) == PLUS
960 && (GET_CODE (XEXP (orig, 0)) == MEM
961 || GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
962 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
963 && XEXP (orig, 0) != pic_offset_table_rtx
964 && GET_CODE (XEXP (orig, 1)) != REG)
968 int is_complex = (GET_CODE (XEXP (orig, 0)) == MEM);
970 base = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
971 orig = machopic_legitimize_pic_address (XEXP (orig, 1),
972 Pmode, (base == reg ? 0 : reg));
973 if (GET_CODE (orig) == CONST_INT)
975 pic_ref = plus_constant (base, INTVAL (orig));
979 pic_ref = gen_rtx_PLUS (Pmode, base, orig);
981 if (reg && is_complex)
983 emit_move_insn (reg, pic_ref);
986 /* Likewise, should we set special REG_NOTEs here? */
989 else if (GET_CODE (orig) == CONST)
991 return machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
994 else if (GET_CODE (orig) == MEM
995 && GET_CODE (XEXP (orig, 0)) == SYMBOL_REF)
997 rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
998 addr = replace_equiv_address (orig, addr);
999 emit_move_insn (reg, addr);
1006 /* Output the stub or non-lazy pointer in *SLOT, if it has been used.
1007 DATA is the FILE* for assembly output. Called from
1011 machopic_output_indirection (void **slot, void *data)
1013 machopic_indirection *p = *((machopic_indirection **) slot);
1014 FILE *asm_out_file = (FILE *) data;
1016 const char *sym_name;
1017 const char *ptr_name;
1023 sym_name = XSTR (symbol, 0);
1024 ptr_name = p->ptr_name;
1032 id = maybe_get_identifier (sym_name);
1037 while (IDENTIFIER_TRANSPARENT_ALIAS (id))
1038 id = TREE_CHAIN (id);
1040 sym_name = IDENTIFIER_POINTER (id);
1043 sym = XALLOCAVEC (char, strlen (sym_name) + 2);
1044 if (sym_name[0] == '*' || sym_name[0] == '&')
1045 strcpy (sym, sym_name + 1);
1046 else if (sym_name[0] == '-' || sym_name[0] == '+')
1047 strcpy (sym, sym_name);
1049 sprintf (sym, "%s%s", user_label_prefix, sym_name);
1051 stub = XALLOCAVEC (char, strlen (ptr_name) + 2);
1052 if (ptr_name[0] == '*' || ptr_name[0] == '&')
1053 strcpy (stub, ptr_name + 1);
1055 sprintf (stub, "%s%s", user_label_prefix, ptr_name);
1057 machopic_output_stub (asm_out_file, sym, stub);
1059 else if (! indirect_data (symbol)
1060 && (machopic_symbol_defined_p (symbol)
1061 || SYMBOL_REF_LOCAL_P (symbol)))
1063 switch_to_section (data_section);
1064 assemble_align (GET_MODE_ALIGNMENT (Pmode));
1065 assemble_label (asm_out_file, ptr_name);
1066 assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name),
1067 GET_MODE_SIZE (Pmode),
1068 GET_MODE_ALIGNMENT (Pmode), 1);
1072 rtx init = const0_rtx;
1074 switch_to_section (darwin_sections[machopic_nl_symbol_ptr_section]);
1076 /* Mach-O symbols are passed around in code through indirect
1077 references and the original symbol_ref hasn't passed through
1078 the generic handling and reference-catching in
1079 output_operand, so we need to manually mark weak references
1081 if (SYMBOL_REF_WEAK (symbol))
1083 tree decl = SYMBOL_REF_DECL (symbol);
1084 gcc_assert (DECL_P (decl));
1086 if (decl != NULL_TREE
1087 && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl)
1088 /* Handle only actual external-only definitions, not
1089 e.g. extern inline code or variables for which
1090 storage has been allocated. */
1091 && !TREE_STATIC (decl))
1093 fputs ("\t.weak_reference ", asm_out_file);
1094 assemble_name (asm_out_file, sym_name);
1095 fputc ('\n', asm_out_file);
1099 assemble_name (asm_out_file, ptr_name);
1100 fprintf (asm_out_file, ":\n");
1102 fprintf (asm_out_file, "\t.indirect_symbol ");
1103 assemble_name (asm_out_file, sym_name);
1104 fprintf (asm_out_file, "\n");
1106 /* Variables that are marked with MACHO_SYMBOL_STATIC need to
1107 have their symbol name instead of 0 in the second entry of
1108 the non-lazy symbol pointer data structure when they are
1109 defined. This allows the runtime to rebind newer instances
1110 of the translation unit with the original instance of the
1113 if ((SYMBOL_REF_FLAGS (symbol) & MACHO_SYMBOL_STATIC)
1114 && machopic_symbol_defined_p (symbol))
1115 init = gen_rtx_SYMBOL_REF (Pmode, sym_name);
1117 assemble_integer (init, GET_MODE_SIZE (Pmode),
1118 GET_MODE_ALIGNMENT (Pmode), 1);
1125 machopic_finish (FILE *asm_out_file)
1127 if (machopic_indirections)
1128 htab_traverse_noresize (machopic_indirections,
1129 machopic_output_indirection,
1134 machopic_operand_p (rtx op)
1136 if (MACHOPIC_JUST_INDIRECT)
1137 return (GET_CODE (op) == SYMBOL_REF
1138 && machopic_symbol_defined_p (op));
1140 return (GET_CODE (op) == CONST
1141 && GET_CODE (XEXP (op, 0)) == UNSPEC
1142 && XINT (XEXP (op, 0), 1) == UNSPEC_MACHOPIC_OFFSET);
1145 /* This function records whether a given name corresponds to a defined
1146 or undefined function or variable, for machopic_classify_ident to
1150 darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
1154 /* Do the standard encoding things first. */
1155 default_encode_section_info (decl, rtl, first);
1157 if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
1160 sym_ref = XEXP (rtl, 0);
1161 if (TREE_CODE (decl) == VAR_DECL)
1162 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE;
1164 if (!DECL_EXTERNAL (decl)
1165 && (!TREE_PUBLIC (decl) || !DECL_WEAK (decl))
1166 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (decl))
1167 && ((TREE_STATIC (decl)
1168 && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl)))
1169 || (!DECL_COMMON (decl) && DECL_INITIAL (decl)
1170 && DECL_INITIAL (decl) != error_mark_node)))
1171 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
1173 if (! TREE_PUBLIC (decl))
1174 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_STATIC;
1178 darwin_mark_decl_preserved (const char *name)
1180 fprintf (asm_out_file, "\t.no_dead_strip ");
1181 assemble_name (asm_out_file, name);
1182 fputc ('\n', asm_out_file);
1186 darwin_rodata_section (int weak, bool zsize)
1189 ? darwin_sections[const_coal_section]
1190 : (zsize ? darwin_sections[zobj_const_section]
1191 : darwin_sections[const_section]));
1195 darwin_mergeable_string_section (tree exp,
1196 unsigned HOST_WIDE_INT align)
1198 /* Darwin's ld expects to see non-writable string literals in the .cstring
1199 section. Later versions of ld check and complain when CFStrings are
1200 enabled. Therefore we shall force the strings into .cstring since we
1201 don't support writable ones anyway. */
1202 if ((darwin_constant_cfstrings || flag_merge_constants)
1203 && TREE_CODE (exp) == STRING_CST
1204 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE
1206 && (int_size_in_bytes (TREE_TYPE (exp))
1207 == TREE_STRING_LENGTH (exp))
1208 && ((size_t) TREE_STRING_LENGTH (exp)
1209 == strlen (TREE_STRING_POINTER (exp)) + 1))
1210 return darwin_sections[cstring_section];
1212 if (DARWIN_SECTION_ANCHORS && flag_section_anchors
1213 && TREE_CODE (exp) == STRING_CST
1214 && TREE_STRING_LENGTH (exp) == 0)
1215 return darwin_sections[zobj_const_section];
1217 return readonly_data_section;
1220 #ifndef HAVE_GAS_LITERAL16
1221 #define HAVE_GAS_LITERAL16 0
1225 darwin_mergeable_constant_section (tree exp,
1226 unsigned HOST_WIDE_INT align,
1229 enum machine_mode mode = DECL_MODE (exp);
1230 unsigned int modesize = GET_MODE_BITSIZE (mode);
1232 if (DARWIN_SECTION_ANCHORS
1233 && flag_section_anchors
1235 return darwin_sections[zobj_const_section];
1237 if (flag_merge_constants
1240 && modesize <= align
1243 && (align & (align -1)) == 0)
1245 tree size = TYPE_SIZE_UNIT (TREE_TYPE (exp));
1247 if (TREE_CODE (size) == INTEGER_CST
1248 && TREE_INT_CST_LOW (size) == 4
1249 && TREE_INT_CST_HIGH (size) == 0)
1250 return darwin_sections[literal4_section];
1251 else if (TREE_CODE (size) == INTEGER_CST
1252 && TREE_INT_CST_LOW (size) == 8
1253 && TREE_INT_CST_HIGH (size) == 0)
1254 return darwin_sections[literal8_section];
1255 else if (HAVE_GAS_LITERAL16
1257 && TREE_CODE (size) == INTEGER_CST
1258 && TREE_INT_CST_LOW (size) == 16
1259 && TREE_INT_CST_HIGH (size) == 0)
1260 return darwin_sections[literal16_section];
1262 return readonly_data_section;
1265 return readonly_data_section;
1269 machopic_reloc_rw_mask (void)
1271 return MACHOPIC_INDIRECT ? 3 : 0;
1274 /* We have to deal with ObjC/C++ metadata section placement in the common
1275 code, since it will also be called from LTO.
1277 Return metadata attributes, if present (searching for ABI=2 first)
1278 Return NULL_TREE if no such attributes are found. */
1281 is_objc_metadata (tree decl)
1284 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == CONST_DECL)
1285 && DECL_ATTRIBUTES (decl))
1287 tree meta = lookup_attribute ("OBJC2META", DECL_ATTRIBUTES (decl));
1290 meta = lookup_attribute ("OBJC1META", DECL_ATTRIBUTES (decl));
1297 /* Return the section required for Objective C ABI 2 metadata. */
1299 darwin_objc2_section (tree decl ATTRIBUTE_UNUSED, tree meta, section * base)
1302 tree ident = TREE_VALUE (meta);
1303 gcc_assert (TREE_CODE (ident) == IDENTIFIER_NODE);
1304 p = IDENTIFIER_POINTER (ident);
1306 /* If we are in LTO, then we don't know the state of flag_next_runtime
1307 or flag_objc_abi when the code was generated. We set these from the
1308 meta-data - which is needed to deal with const string constructors. */
1310 flag_next_runtime = 1;
1313 if (base == data_section)
1314 base = darwin_sections[objc2_metadata_section];
1316 /* Most of the OBJC2 META-data end up in the base section, so check it
1318 if (!strncmp (p, "V2_BASE", 7))
1320 else if (!strncmp (p, "V2_STRG", 7))
1321 return darwin_sections[cstring_section];
1323 else if (!strncmp (p, "G2_META", 7) || !strncmp (p, "G2_CLAS", 7))
1324 return darwin_sections[objc2_classdefs_section];
1325 else if (!strncmp (p, "V2_MREF", 7))
1326 return darwin_sections[objc2_message_refs_section];
1327 else if (!strncmp (p, "V2_CLRF", 7))
1328 return darwin_sections[objc2_classrefs_section];
1329 else if (!strncmp (p, "V2_SURF", 7))
1330 return darwin_sections[objc2_super_classrefs_section];
1331 else if (!strncmp (p, "V2_NLCL", 7))
1332 return darwin_sections[objc2_nonlazy_class_section];
1333 else if (!strncmp (p, "V2_CLAB", 7))
1334 return darwin_sections[objc2_classlist_section];
1335 else if (!strncmp (p, "V2_SRFS", 7))
1336 return darwin_sections[objc2_selector_refs_section];
1337 else if (!strncmp (p, "V2_NLCA", 7))
1338 return darwin_sections[objc2_nonlazy_category_section];
1339 else if (!strncmp (p, "V2_CALA", 7))
1340 return darwin_sections[objc2_categorylist_section];
1342 else if (!strncmp (p, "V2_PLST", 7))
1343 return darwin_sections[objc2_protocollist_section];
1344 else if (!strncmp (p, "V2_PRFS", 7))
1345 return darwin_sections[objc2_protocolrefs_section];
1347 else if (!strncmp (p, "V2_INFO", 7))
1348 return darwin_sections[objc2_image_info_section];
1350 else if (!strncmp (p, "V2_EHTY", 7))
1351 return darwin_sections[data_coal_section];
1353 else if (!strncmp (p, "V2_CSTR", 7))
1354 return darwin_sections[objc2_constant_string_object_section];
1356 /* Not recognized, default. */
1360 /* Return the section required for Objective C ABI 0/1 metadata. */
1362 darwin_objc1_section (tree decl ATTRIBUTE_UNUSED, tree meta, section * base)
1365 tree ident = TREE_VALUE (meta);
1366 gcc_assert (TREE_CODE (ident) == IDENTIFIER_NODE);
1367 p = IDENTIFIER_POINTER (ident);
1369 /* If we are in LTO, then we don't know the state of flag_next_runtime
1370 or flag_objc_abi when the code was generated. We set these from the
1371 meta-data - which is needed to deal with const string constructors. */
1372 flag_next_runtime = 1;
1373 if (!global_options_set.x_flag_objc_abi)
1376 /* String sections first, cos there are lots of strings. */
1377 if (!strncmp (p, "V1_STRG", 7))
1378 return darwin_sections[cstring_section];
1379 else if (!strncmp (p, "V1_CLSN", 7))
1380 return darwin_sections[objc_class_names_section];
1381 else if (!strncmp (p, "V1_METN", 7))
1382 return darwin_sections[objc_meth_var_names_section];
1383 else if (!strncmp (p, "V1_METT", 7))
1384 return darwin_sections[objc_meth_var_types_section];
1386 else if (!strncmp (p, "V1_CLAS", 7))
1387 return darwin_sections[objc_class_section];
1388 else if (!strncmp (p, "V1_META", 7))
1389 return darwin_sections[objc_meta_class_section];
1390 else if (!strncmp (p, "V1_CATG", 7))
1391 return darwin_sections[objc_category_section];
1392 else if (!strncmp (p, "V1_PROT", 7))
1393 return darwin_sections[objc_protocol_section];
1395 else if (!strncmp (p, "V1_CLCV", 7))
1396 return darwin_sections[objc_class_vars_section];
1397 else if (!strncmp (p, "V1_CLIV", 7))
1398 return darwin_sections[objc_instance_vars_section];
1400 else if (!strncmp (p, "V1_CLCM", 7))
1401 return darwin_sections[objc_cls_meth_section];
1402 else if (!strncmp (p, "V1_CLIM", 7))
1403 return darwin_sections[objc_inst_meth_section];
1404 else if (!strncmp (p, "V1_CACM", 7))
1405 return darwin_sections[objc_cat_cls_meth_section];
1406 else if (!strncmp (p, "V1_CAIM", 7))
1407 return darwin_sections[objc_cat_inst_meth_section];
1408 else if (!strncmp (p, "V1_PNSM", 7))
1409 return darwin_sections[objc_cat_inst_meth_section];
1410 else if (!strncmp (p, "V1_PCLM", 7))
1411 return darwin_sections[objc_cat_cls_meth_section];
1413 else if (!strncmp (p, "V1_CLPR", 7))
1414 return darwin_sections[objc_cat_cls_meth_section];
1415 else if (!strncmp (p, "V1_CAPR", 7))
1416 return darwin_sections[objc_category_section]; /* ??? CHECK me. */
1418 else if (!strncmp (p, "V1_PRFS", 7))
1419 return darwin_sections[objc_cat_cls_meth_section];
1420 else if (!strncmp (p, "V1_CLRF", 7))
1421 return darwin_sections[objc_cls_refs_section];
1422 else if (!strncmp (p, "V1_SRFS", 7))
1423 return darwin_sections[objc_selector_refs_section];
1425 else if (!strncmp (p, "V1_MODU", 7))
1426 return darwin_sections[objc_module_info_section];
1427 else if (!strncmp (p, "V1_SYMT", 7))
1428 return darwin_sections[objc_symbols_section];
1429 else if (!strncmp (p, "V1_INFO", 7))
1430 return darwin_sections[objc_image_info_section];
1432 else if (!strncmp (p, "V1_PLST", 7))
1433 return darwin_sections[objc1_prop_list_section];
1434 else if (!strncmp (p, "V1_PEXT", 7))
1435 return darwin_sections[objc1_protocol_ext_section];
1436 else if (!strncmp (p, "V1_CEXT", 7))
1437 return darwin_sections[objc1_class_ext_section];
1439 else if (!strncmp (p, "V2_CSTR", 7))
1440 return darwin_sections[objc_constant_string_object_section];
1446 machopic_select_section (tree decl,
1448 unsigned HOST_WIDE_INT align)
1450 bool zsize, one, weak, ro;
1451 section *base_section = NULL;
1453 weak = (DECL_P (decl)
1455 && !lookup_attribute ("weak_import", DECL_ATTRIBUTES (decl)));
1457 zsize = (DECL_P (decl)
1458 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == CONST_DECL)
1459 && tree_low_cst (DECL_SIZE_UNIT (decl), 1) == 0);
1462 && TREE_CODE (decl) == VAR_DECL
1463 && DECL_ONE_ONLY (decl);
1465 ro = TREE_READONLY (decl) || TREE_CONSTANT (decl) ;
1467 switch (categorize_decl_for_section (decl, reloc))
1474 case SECCAT_SRODATA:
1475 base_section = darwin_rodata_section (weak, zsize);
1478 case SECCAT_RODATA_MERGE_STR:
1479 base_section = darwin_mergeable_string_section (decl, align);
1482 case SECCAT_RODATA_MERGE_STR_INIT:
1483 base_section = darwin_mergeable_string_section (DECL_INITIAL (decl), align);
1486 case SECCAT_RODATA_MERGE_CONST:
1487 base_section = darwin_mergeable_constant_section (decl, align, zsize);
1491 case SECCAT_DATA_REL:
1492 case SECCAT_DATA_REL_LOCAL:
1493 case SECCAT_DATA_REL_RO:
1494 case SECCAT_DATA_REL_RO_LOCAL:
1500 base_section = darwin_sections[const_data_coal_section];
1502 base_section = darwin_sections[data_coal_section];
1504 else if (DARWIN_SECTION_ANCHORS
1505 && flag_section_anchors
1508 /* If we're doing section anchors, then punt zero-sized objects into
1509 their own sections so that they don't interfere with offset
1510 computation for the remaining vars. This does not need to be done
1511 for stuff in mergeable sections, since these are ineligible for
1514 base_section = darwin_sections[zobj_const_data_section];
1516 base_section = darwin_sections[zobj_data_section];
1519 base_section = darwin_sections[const_data_section];
1521 base_section = data_section;
1527 base_section = darwin_sections[data_coal_section];
1530 if (!TREE_PUBLIC (decl))
1531 base_section = lcomm_section;
1532 else if (bss_noswitch_section)
1533 base_section = bss_noswitch_section;
1535 base_section = data_section;
1543 /* Darwin weird special cases.
1544 a) OBJC Meta-data. */
1546 && (TREE_CODE (decl) == VAR_DECL
1547 || TREE_CODE (decl) == CONST_DECL)
1548 && DECL_ATTRIBUTES (decl))
1550 tree meta = lookup_attribute ("OBJC2META", DECL_ATTRIBUTES (decl));
1552 return darwin_objc2_section (decl, meta, base_section);
1553 meta = lookup_attribute ("OBJC1META", DECL_ATTRIBUTES (decl));
1555 return darwin_objc1_section (decl, meta, base_section);
1556 meta = lookup_attribute ("OBJC1METG", DECL_ATTRIBUTES (decl));
1558 return base_section; /* GNU runtime is happy with it all in one pot. */
1561 /* b) Constant string objects. */
1562 if (TREE_CODE (decl) == CONSTRUCTOR
1564 && TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
1565 && TYPE_NAME (TREE_TYPE (decl)))
1567 tree name = TYPE_NAME (TREE_TYPE (decl));
1568 if (TREE_CODE (name) == TYPE_DECL)
1569 name = DECL_NAME (name);
1571 /* FIXME: This is unsatisfactory for LTO, since it relies on other
1572 metadata determining the source FE. */
1573 if (!strcmp (IDENTIFIER_POINTER (name), "__builtin_ObjCString"))
1575 if (flag_next_runtime)
1577 if (flag_objc_abi == 2)
1578 return darwin_sections[objc2_constant_string_object_section];
1580 return darwin_sections[objc_constant_string_object_section];
1583 return darwin_sections[objc_string_object_section];
1585 else if (!strcmp (IDENTIFIER_POINTER (name), "__builtin_CFString"))
1586 return darwin_sections[cfstring_constant_object_section];
1588 return base_section;
1590 /* c) legacy meta-data selection. */
1591 else if (TREE_CODE (decl) == VAR_DECL
1593 && TREE_CODE (DECL_NAME (decl)) == IDENTIFIER_NODE
1594 && IDENTIFIER_POINTER (DECL_NAME (decl))
1595 && flag_next_runtime
1596 && !strncmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "_OBJC_", 6))
1598 const char *name = IDENTIFIER_POINTER (DECL_NAME (decl));
1599 static bool warned_objc_46 = false;
1600 /* We shall assert that zero-sized objects are an error in ObjC
1602 gcc_assert (tree_low_cst (DECL_SIZE_UNIT (decl), 1) != 0);
1604 /* ??? This mechanism for determining the metadata section is
1605 broken when LTO is in use, since the frontend that generated
1606 the data is not identified. We will keep the capability for
1607 the short term - in case any non-Objective-C programs are using
1608 it to place data in specified sections. */
1609 if (!warned_objc_46)
1611 location_t loc = DECL_SOURCE_LOCATION (decl);
1612 warning_at (loc, 0, "the use of _OBJC_-prefixed variable names"
1613 " to select meta-data sections is deprecated at 4.6"
1614 " and will be removed in 4.7");
1615 warned_objc_46 = true;
1618 if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20))
1619 return darwin_sections[objc_cls_meth_section];
1620 else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23))
1621 return darwin_sections[objc_inst_meth_section];
1622 else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 29))
1623 return darwin_sections[objc_cat_cls_meth_section];
1624 else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 32))
1625 return darwin_sections[objc_cat_inst_meth_section];
1626 else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22))
1627 return darwin_sections[objc_class_vars_section];
1628 else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25))
1629 return darwin_sections[objc_instance_vars_section];
1630 else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22))
1631 return darwin_sections[objc_cat_cls_meth_section];
1632 else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17))
1633 return darwin_sections[objc_class_names_section];
1634 else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20))
1635 return darwin_sections[objc_meth_var_names_section];
1636 else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20))
1637 return darwin_sections[objc_meth_var_types_section];
1638 else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22))
1639 return darwin_sections[objc_cls_refs_section];
1640 else if (!strncmp (name, "_OBJC_CLASS_", 12))
1641 return darwin_sections[objc_class_section];
1642 else if (!strncmp (name, "_OBJC_METACLASS_", 16))
1643 return darwin_sections[objc_meta_class_section];
1644 else if (!strncmp (name, "_OBJC_CATEGORY_", 15))
1645 return darwin_sections[objc_category_section];
1646 else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25))
1647 return darwin_sections[objc_selector_refs_section];
1648 else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20))
1649 return darwin_sections[objc_selector_fixup_section];
1650 else if (!strncmp (name, "_OBJC_SYMBOLS", 13))
1651 return darwin_sections[objc_symbols_section];
1652 else if (!strncmp (name, "_OBJC_MODULES", 13))
1653 return darwin_sections[objc_module_info_section];
1654 else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16))
1655 return darwin_sections[objc_image_info_section];
1656 else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32))
1657 return darwin_sections[objc_cat_inst_meth_section];
1658 else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29))
1659 return darwin_sections[objc_cat_cls_meth_section];
1660 else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20))
1661 return darwin_sections[objc_cat_cls_meth_section];
1662 else if (!strncmp (name, "_OBJC_PROTOCOL_", 15))
1663 return darwin_sections[objc_protocol_section];
1665 return base_section;
1668 return base_section;
1671 /* This can be called with address expressions as "rtx".
1672 They must go in "const". */
1675 machopic_select_rtx_section (enum machine_mode mode, rtx x,
1676 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
1678 if (GET_MODE_SIZE (mode) == 8
1679 && (GET_CODE (x) == CONST_INT
1680 || GET_CODE (x) == CONST_DOUBLE))
1681 return darwin_sections[literal8_section];
1682 else if (GET_MODE_SIZE (mode) == 4
1683 && (GET_CODE (x) == CONST_INT
1684 || GET_CODE (x) == CONST_DOUBLE))
1685 return darwin_sections[literal4_section];
1686 else if (HAVE_GAS_LITERAL16
1688 && GET_MODE_SIZE (mode) == 16
1689 && (GET_CODE (x) == CONST_INT
1690 || GET_CODE (x) == CONST_DOUBLE
1691 || GET_CODE (x) == CONST_VECTOR))
1692 return darwin_sections[literal16_section];
1693 else if (MACHOPIC_INDIRECT
1694 && (GET_CODE (x) == SYMBOL_REF
1695 || GET_CODE (x) == CONST
1696 || GET_CODE (x) == LABEL_REF))
1697 return darwin_sections[const_data_section];
1699 return darwin_sections[const_section];
1703 machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1705 if (MACHOPIC_INDIRECT)
1706 switch_to_section (darwin_sections[mod_init_section]);
1708 switch_to_section (darwin_sections[constructor_section]);
1709 assemble_align (POINTER_SIZE);
1710 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1712 if (! MACHOPIC_INDIRECT)
1713 fprintf (asm_out_file, ".reference .constructors_used\n");
1717 machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1719 if (MACHOPIC_INDIRECT)
1720 switch_to_section (darwin_sections[mod_term_section]);
1722 switch_to_section (darwin_sections[destructor_section]);
1723 assemble_align (POINTER_SIZE);
1724 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1726 if (! MACHOPIC_INDIRECT)
1727 fprintf (asm_out_file, ".reference .destructors_used\n");
1731 darwin_globalize_label (FILE *stream, const char *name)
1733 if (!!strncmp (name, "_OBJC_", 6))
1734 default_globalize_label (stream, name);
1737 /* This routine returns non-zero if 'name' starts with the special objective-c
1738 anonymous file-scope static name. It accommodates c++'s mangling of such
1739 symbols (in this case the symbols will have form _ZL{d}*_OBJC_* d=digit). */
1742 darwin_label_is_anonymous_local_objc_name (const char *name)
1744 const unsigned char *p = (const unsigned char *) name;
1747 if (p[1] == 'Z' && p[2] == 'L')
1750 while (*p >= '0' && *p <= '9')
1753 return (!strncmp ((const char *)p, "_OBJC_", 6));
1756 /* LTO support for Mach-O.
1758 This version uses three mach-o sections to encapsulate the (unlimited
1759 number of) lto sections.
1761 __GNU_LTO, __lto_sections contains the concatented GNU LTO section data.
1762 __GNU_LTO, __section_names contains the GNU LTO section names.
1763 __GNU_LTO, __section_index contains an array of values that index these.
1766 <section offset from the start of __GNU_LTO, __lto_sections>,
1768 <name offset from the start of __GNU_LTO, __section_names,
1771 At present, for both m32 and m64 mach-o files each of these fields is
1772 represented by a uint32_t. This is because, AFAICT, a mach-o object
1773 cannot exceed 4Gb because the section_64 offset field (see below) is 32bits.
1776 "offset An integer specifying the offset to this section in the file." */
1778 /* Count lto section numbers. */
1779 static unsigned int lto_section_num = 0;
1781 /* A vector of information about LTO sections, at present, we only have
1782 the name. TODO: see if we can get the data length somehow. */
1783 typedef struct GTY (()) darwin_lto_section_e {
1784 const char *sectname;
1785 } darwin_lto_section_e ;
1786 DEF_VEC_O(darwin_lto_section_e);
1787 DEF_VEC_ALLOC_O(darwin_lto_section_e, gc);
1789 static GTY (()) VEC (darwin_lto_section_e, gc) * lto_section_names;
1791 /* Segment for LTO data. */
1792 #define LTO_SEGMENT_NAME "__GNU_LTO"
1794 /* Section wrapper scheme (used here to wrap the unlimited number of LTO
1795 sections into three Mach-O ones).
1796 NOTE: These names MUST be kept in sync with those in
1797 libiberty/simple-object-mach-o. */
1798 #define LTO_SECTS_SECTION "__wrapper_sects"
1799 #define LTO_NAMES_SECTION "__wrapper_names"
1800 #define LTO_INDEX_SECTION "__wrapper_index"
1802 /* File to temporarily store LTO data. This is appended to asm_out_file
1803 in darwin_end_file. */
1804 static FILE *lto_asm_out_file, *saved_asm_out_file;
1805 static char *lto_asm_out_name;
1807 /* Prepare asm_out_file for LTO output. For darwin, this means hiding
1808 asm_out_file and switching to an alternative output file. */
1810 darwin_asm_lto_start (void)
1812 gcc_assert (! saved_asm_out_file);
1813 saved_asm_out_file = asm_out_file;
1814 if (! lto_asm_out_name)
1815 lto_asm_out_name = make_temp_file (".lto.s");
1816 lto_asm_out_file = fopen (lto_asm_out_name, "a");
1817 if (lto_asm_out_file == NULL)
1818 fatal_error ("failed to open temporary file %s for LTO output",
1820 asm_out_file = lto_asm_out_file;
1823 /* Restore asm_out_file. */
1825 darwin_asm_lto_end (void)
1827 gcc_assert (saved_asm_out_file);
1828 fclose (lto_asm_out_file);
1829 asm_out_file = saved_asm_out_file;
1830 saved_asm_out_file = NULL;
1834 darwin_asm_dwarf_section (const char *name, unsigned int flags, tree decl);
1836 /* Called for the TARGET_ASM_NAMED_SECTION hook. */
1839 darwin_asm_named_section (const char *name,
1841 tree decl ATTRIBUTE_UNUSED)
1843 /* LTO sections go in a special section that encapsulates the (unlimited)
1844 number of GNU LTO sections within a single mach-o one. */
1845 if (strncmp (name, LTO_SECTION_NAME_PREFIX,
1846 strlen (LTO_SECTION_NAME_PREFIX)) == 0)
1848 darwin_lto_section_e e;
1849 /* We expect certain flags to be set... */
1850 gcc_assert ((flags & (SECTION_DEBUG | SECTION_NAMED))
1851 == (SECTION_DEBUG | SECTION_NAMED));
1853 /* Switch to our combined section. */
1854 fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n",
1855 LTO_SEGMENT_NAME, LTO_SECTS_SECTION);
1856 /* Output a label for the start of this sub-section. */
1857 fprintf (asm_out_file, "L_GNU_LTO%d:\t;# %s\n",
1858 lto_section_num, name);
1859 /* We have to jump through hoops to get the values of the intra-section
1861 fprintf (asm_out_file, "\t.set L$gnu$lto$offs%d,L_GNU_LTO%d-L_GNU_LTO0\n",
1862 lto_section_num, lto_section_num);
1863 fprintf (asm_out_file,
1864 "\t.set L$gnu$lto$size%d,L_GNU_LTO%d-L_GNU_LTO%d\n",
1865 lto_section_num, lto_section_num+1, lto_section_num);
1867 e.sectname = xstrdup (name);
1868 /* Keep the names, we'll need to make a table later.
1869 TODO: check that we do not revisit sections, that would break
1870 the assumption of how this is done. */
1871 if (lto_section_names == NULL)
1872 lto_section_names = VEC_alloc (darwin_lto_section_e, gc, 16);
1873 VEC_safe_push (darwin_lto_section_e, gc, lto_section_names, &e);
1875 else if (strncmp (name, "__DWARF,", 8) == 0)
1876 darwin_asm_dwarf_section (name, flags, decl);
1878 fprintf (asm_out_file, "\t.section %s\n", name);
1882 darwin_unique_section (tree decl ATTRIBUTE_UNUSED, int reloc ATTRIBUTE_UNUSED)
1884 /* Darwin does not use unique sections. */
1887 /* Handle __attribute__ ((apple_kext_compatibility)).
1888 This only applies to darwin kexts for 2.95 compatibility -- it shrinks the
1889 vtable for classes with this attribute (and their descendants) by not
1890 outputting the new 3.0 nondeleting destructor. This means that such
1891 objects CANNOT be allocated on the stack or as globals UNLESS they have
1892 a completely empty `operator delete'.
1893 Luckily, this fits in with the Darwin kext model.
1895 This attribute also disables gcc3's potential overlaying of derived
1896 class data members on the padding at the end of the base class. */
1899 darwin_handle_kext_attribute (tree *node, tree name,
1900 tree args ATTRIBUTE_UNUSED,
1901 int flags ATTRIBUTE_UNUSED,
1904 /* APPLE KEXT stuff -- only applies with pure static C++ code. */
1905 if (! TARGET_KEXTABI)
1907 warning (0, "%qE 2.95 vtable-compatibility attribute applies "
1908 "only when compiling a kext", name);
1910 *no_add_attrs = true;
1912 else if (TREE_CODE (*node) != RECORD_TYPE)
1914 warning (0, "%qE 2.95 vtable-compatibility attribute applies "
1915 "only to C++ classes", name);
1917 *no_add_attrs = true;
1923 /* Handle a "weak_import" attribute; arguments as in
1924 struct attribute_spec.handler. */
1927 darwin_handle_weak_import_attribute (tree *node, tree name,
1928 tree ARG_UNUSED (args),
1929 int ARG_UNUSED (flags),
1930 bool * no_add_attrs)
1932 if (TREE_CODE (*node) != FUNCTION_DECL && TREE_CODE (*node) != VAR_DECL)
1934 warning (OPT_Wattributes, "%qE attribute ignored",
1936 *no_add_attrs = true;
1939 declare_weak (*node);
1944 /* Emit a label for an FDE, making it global and/or weak if appropriate.
1945 The third parameter is nonzero if this is for exception handling.
1946 The fourth parameter is nonzero if this is just a placeholder for an
1947 FDE that we are omitting. */
1950 darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty)
1954 static int invok_count = 0;
1955 static tree last_fun_decl = NULL_TREE;
1957 /* We use the linker to emit the .eh labels for Darwin 9 and above. */
1958 if (! for_eh || generating_for_darwin_version >= 9)
1961 /* FIXME: This only works when the eh for all sections of a function is
1962 emitted at the same time. If that changes, we would need to use a lookup
1963 table of some form to determine what to do. Also, we should emit the
1964 unadorned label for the partition containing the public label for a
1965 function. This is of limited use, probably, since we do not currently
1966 enable partitioning. */
1967 strcpy (buf, ".eh");
1968 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
1970 if (decl == last_fun_decl)
1973 snprintf (buf, 31, "$$part$$%d.eh", invok_count);
1977 last_fun_decl = decl;
1982 lab = concat (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)), buf, NULL);
1984 if (TREE_PUBLIC (decl))
1986 targetm.asm_out.globalize_label (file, lab);
1987 if (DECL_VISIBILITY (decl) == VISIBILITY_HIDDEN)
1989 fputs ("\t.private_extern ", file);
1990 assemble_name (file, lab);
1995 if (DECL_WEAK (decl))
1997 fputs ("\t.weak_definition ", file);
1998 assemble_name (file, lab);
2002 assemble_name (file, lab);
2005 fputs (" = 0\n", file);
2007 /* Mark the absolute .eh and .eh1 style labels as needed to
2008 ensure that we don't dead code strip them and keep such
2009 labels from another instantiation point until we can fix this
2010 properly with group comdat support. */
2011 darwin_mark_decl_preserved (lab);
2014 fputs (":\n", file);
2019 static GTY(()) unsigned long except_table_label_num;
2022 darwin_emit_except_table_label (FILE *file)
2024 char section_start_label[30];
2026 ASM_GENERATE_INTERNAL_LABEL (section_start_label, "GCC_except_table",
2027 except_table_label_num++);
2028 ASM_OUTPUT_LABEL (file, section_start_label);
2030 /* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */
2033 darwin_non_lazy_pcrel (FILE *file, rtx addr)
2035 const char *nlp_name;
2037 gcc_assert (GET_CODE (addr) == SYMBOL_REF);
2039 nlp_name = machopic_indirection_name (addr, /*stub_p=*/false);
2040 fputs ("\t.long\t", file);
2041 ASM_OUTPUT_LABELREF (file, nlp_name);
2045 /* If this is uncommented, details of each allocation will be printed
2046 in the asm right before the actual code. WARNING - this will cause some
2047 test-suite fails (since the printout will contain items that some tests
2048 are not expecting) -- so don't leave it on by default (it bloats the
2050 /*#define DEBUG_DARWIN_MEM_ALLOCATORS*/
2052 /* The first two of these routines are ostensibly just intended to put
2053 names into the asm. However, they are both hijacked in order to ensure
2054 that zero-sized items do not make their way into the output. Consequently,
2055 we also need to make these participate in provisions for dealing with
2056 such items in section anchors. */
2058 /* The implementation of ASM_DECLARE_OBJECT_NAME. */
2059 /* The RTTI data (e.g., __ti4name) is common and public (and static),
2060 but it does need to be referenced via indirect PIC data pointers.
2061 The machopic_define_symbol calls are telling the machopic subsystem
2062 that the name *is* defined in this module, so it doesn't need to
2063 make them indirect. */
2065 darwin_asm_declare_object_name (FILE *file,
2066 const char *nam, tree decl)
2068 const char *xname = nam;
2069 unsigned HOST_WIDE_INT size;
2070 bool local_def, weak;
2072 weak = (DECL_P (decl)
2074 && !lookup_attribute ("weak_import",
2075 DECL_ATTRIBUTES (decl)));
2077 local_def = DECL_INITIAL (decl) || (TREE_STATIC (decl)
2078 && (!DECL_COMMON (decl)
2079 || !TREE_PUBLIC (decl)));
2081 if (GET_CODE (XEXP (DECL_RTL (decl), 0)) != SYMBOL_REF)
2082 xname = IDENTIFIER_POINTER (DECL_NAME (decl));
2086 (* targetm.encode_section_info) (decl, DECL_RTL (decl), false);
2088 machopic_define_symbol (DECL_RTL (decl));
2091 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
2093 #ifdef DEBUG_DARWIN_MEM_ALLOCATORS
2094 fprintf (file, "# dadon: %s %s (%llu, %u) local %d weak %d"
2095 " stat %d com %d pub %d t-const %d t-ro %d init %lx\n",
2096 xname, (TREE_CODE (decl) == VAR_DECL?"var":"const"),
2097 (unsigned long long)size, DECL_ALIGN (decl), local_def,
2098 DECL_WEAK (decl), TREE_STATIC (decl), DECL_COMMON (decl),
2099 TREE_PUBLIC (decl), TREE_CONSTANT (decl), TREE_READONLY (decl),
2100 (unsigned long)DECL_INITIAL (decl));
2103 /* Darwin needs help to support local zero-sized objects.
2104 They must be made at least one byte, and the section containing must be
2105 marked as unsuitable for section-anchors (see storage allocators below).
2107 For non-zero objects this output is handled by varasm.c.
2111 unsigned int l2align = 0;
2113 /* The align must be honored, even for zero-sized. */
2114 if (DECL_ALIGN (decl))
2116 l2align = floor_log2 (DECL_ALIGN (decl) / BITS_PER_UNIT);
2117 fprintf (file, "\t.align\t%u\n", l2align);
2120 ASM_OUTPUT_LABEL (file, xname);
2122 fprintf (file, "\t.space\t"HOST_WIDE_INT_PRINT_UNSIGNED"\n", size);
2124 /* Check that we've correctly picked up the zero-sized item and placed it
2126 gcc_assert ((!DARWIN_SECTION_ANCHORS || !flag_section_anchors)
2128 && (in_section->common.flags & SECTION_NO_ANCHOR)));
2131 ASM_OUTPUT_LABEL (file, xname);
2134 /* The implementation of ASM_DECLARE_CONSTANT_NAME. */
2136 darwin_asm_declare_constant_name (FILE *file, const char *name,
2137 const_tree exp ATTRIBUTE_UNUSED,
2140 assemble_label (file, name);
2141 /* As for other items, we need at least one byte. */
2144 fputs ("\t.space\t1\n", file);
2145 /* Check that we've correctly picked up the zero-sized item and placed it
2147 gcc_assert ((!DARWIN_SECTION_ANCHORS || !flag_section_anchors)
2149 && (in_section->common.flags & SECTION_NO_ANCHOR)));
2153 /* Darwin storage allocators.
2155 Zerofill sections are desirable for large blank data since, otherwise, these
2156 data bloat objects (PR33210).
2158 However, section anchors don't work in .zerofill sections (one cannot switch
2159 to a zerofill section). Ergo, for Darwin targets using section anchors we need
2160 to put (at least some) data into 'normal' switchable sections.
2162 Here we set a relatively arbitrary value for the size of an object to trigger
2163 zerofill when section anchors are enabled (anything bigger than a page for
2164 current Darwin implementations). FIXME: there ought to be some objective way
2165 to make this choice.
2167 When section anchor are off this is ignored anyway. */
2169 #define BYTES_ZFILL 4096
2171 /* Emit a chunk of data for items coalesced by the linker. */
2173 darwin_emit_weak_or_comdat (FILE *fp, tree decl, const char *name,
2174 unsigned HOST_WIDE_INT size,
2177 /* Since the sections used here are coalesed, they will not be eligible
2178 for section anchors, and therefore we don't need to break that out. */
2179 if (TREE_READONLY (decl) || TREE_CONSTANT (decl))
2180 switch_to_section (darwin_sections[const_data_coal_section]);
2182 switch_to_section (darwin_sections[data_coal_section]);
2184 /* To be consistent, we'll allow darwin_asm_declare_object_name to assemble
2185 the align info for zero-sized items... but do it here otherwise. */
2187 fprintf (fp, "\t.align\t%d\n", floor_log2 (align / BITS_PER_UNIT));
2189 if (TREE_PUBLIC (decl))
2190 darwin_globalize_label (fp, name);
2192 /* ... and we let it deal with outputting one byte of zero for them too. */
2193 darwin_asm_declare_object_name (fp, name, decl);
2195 assemble_zeros (size);
2198 /* Emit a chunk of data for ObjC meta-data that got placed in BSS erroneously. */
2200 darwin_emit_objc_zeroed (FILE *fp, tree decl, const char *name,
2201 unsigned HOST_WIDE_INT size,
2202 unsigned int align, tree meta)
2204 section *ocs = data_section;
2206 if (TREE_PURPOSE (meta) == get_identifier("OBJC2META"))
2207 ocs = darwin_objc2_section (decl, meta, ocs);
2209 ocs = darwin_objc1_section (decl, meta, ocs);
2211 switch_to_section (ocs);
2213 /* We shall declare that zero-sized meta-data are not valid (yet). */
2215 fprintf (fp, "\t.align\t%d\n", floor_log2 (align / BITS_PER_UNIT));
2217 /* ... and we let it deal with outputting one byte of zero for them too. */
2218 darwin_asm_declare_object_name (fp, name, decl);
2219 assemble_zeros (size);
2222 /* This routine emits 'local' storage:
2224 When Section Anchors are off this routine emits .zerofill commands in
2225 sections named for their alignment.
2227 When Section Anchors are on, smaller (non-zero-sized) items are placed in
2228 the .static_data section so that the section anchoring system can see them.
2229 Larger items are still placed in .zerofill sections, addressing PR33210.
2230 The routine has no checking - it is all assumed to be done by the caller.
2233 darwin_emit_local_bss (FILE *fp, tree decl, const char *name,
2234 unsigned HOST_WIDE_INT size,
2235 unsigned int l2align)
2237 /* FIXME: We have a fudge to make this work with Java even when the target does
2238 not use sections anchors -- Java seems to need at least one small item in a
2239 non-zerofill segment. */
2240 if ((DARWIN_SECTION_ANCHORS && flag_section_anchors && size < BYTES_ZFILL)
2241 || (size && size <= 2))
2243 /* Put smaller objects in _static_data, where the section anchors system
2245 However, if they are zero-sized punt them to yet a different section
2246 (that is not allowed to participate in anchoring). */
2249 fputs ("\t.section\t__DATA,__zobj_bss\n", fp);
2250 in_section = darwin_sections[zobj_bss_section];
2255 fputs ("\t.static_data\n", fp);
2256 in_section = darwin_sections[static_data_section];
2260 fprintf (fp, "\t.align\t%u\n", l2align);
2262 assemble_name (fp, name);
2263 fprintf (fp, ":\n\t.space\t"HOST_WIDE_INT_PRINT_UNSIGNED"\n", size);
2267 /* When we are on a non-section anchor target, we can get zero-sized
2268 items here. However, all we need to do is to bump them to one byte
2269 and the section alignment will take care of the rest. */
2271 unsigned int flags ;
2272 snprintf (secnam, 64, "__DATA,__%sbss%u", ((size)?"":"zo_"),
2273 (unsigned) l2align);
2274 /* We can't anchor (yet, if ever) in zerofill sections, because we can't
2275 switch to them and emit a label. */
2276 flags = SECTION_BSS|SECTION_WRITE|SECTION_NO_ANCHOR;
2277 in_section = get_section (secnam, flags, NULL);
2278 fprintf (fp, "\t.zerofill %s,", secnam);
2279 assemble_name (fp, name);
2284 fprintf (fp, ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n",
2285 size, (unsigned) l2align);
2287 fprintf (fp, ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", size);
2290 (*targetm.encode_section_info) (decl, DECL_RTL (decl), false);
2291 /* This is defined as a file-scope var, so we know to notify machopic. */
2292 machopic_define_symbol (DECL_RTL (decl));
2295 /* Emit a chunk of common. */
2297 darwin_emit_common (FILE *fp, const char *name,
2298 unsigned HOST_WIDE_INT size, unsigned int align)
2300 unsigned HOST_WIDE_INT rounded;
2301 unsigned int l2align;
2303 /* Earlier systems complain if the alignment exceeds the page size.
2304 The magic number is 4096 * 8 - hard-coded for legacy systems. */
2305 if (!emit_aligned_common && (align > 32768UL))
2306 align = 4096UL; /* In units. */
2308 align /= BITS_PER_UNIT;
2310 /* Make sure we have a meaningful align. */
2314 /* For earlier toolchains, we need to emit the var as a rounded size to
2315 tell ld the alignment. */
2319 rounded = (size + (align-1)) & ~(align-1);
2321 l2align = floor_log2 (align);
2322 gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT);
2324 in_section = comm_section;
2325 /* We mustn't allow multiple public symbols to share an address when using
2326 the normal OSX toolchain. */
2329 /* Put at least one byte. */
2331 /* This section can no longer participate in section anchoring. */
2332 comm_section->common.flags |= SECTION_NO_ANCHOR;
2335 fputs ("\t.comm\t", fp);
2336 assemble_name (fp, name);
2337 fprintf (fp, "," HOST_WIDE_INT_PRINT_UNSIGNED,
2338 emit_aligned_common?size:rounded);
2339 if (l2align && emit_aligned_common)
2340 fprintf (fp, ",%u", l2align);
2344 /* Output a var which is all zero - into aligned BSS sections, common, lcomm
2345 or coalescable data sections (for weak or comdat) as appropriate. */
2348 darwin_output_aligned_bss (FILE *fp, tree decl, const char *name,
2349 unsigned HOST_WIDE_INT size, unsigned int align)
2351 unsigned int l2align;
2352 bool one, pub, weak;
2355 pub = TREE_PUBLIC (decl);
2356 one = DECL_ONE_ONLY (decl);
2357 weak = (DECL_P (decl)
2359 && !lookup_attribute ("weak_import",
2360 DECL_ATTRIBUTES (decl)));
2362 #ifdef DEBUG_DARWIN_MEM_ALLOCATORS
2363 fprintf (fp, "# albss: %s (%lld,%d) ro %d cst %d stat %d com %d"
2364 " pub %d weak %d one %d init %lx\n",
2365 name, (long long)size, (int)align, TREE_READONLY (decl),
2366 TREE_CONSTANT (decl), TREE_STATIC (decl), DECL_COMMON (decl),
2367 pub, weak, one, (unsigned long)DECL_INITIAL (decl));
2370 /* ObjC metadata can get put in BSS because varasm.c decides it's BSS
2371 before the target has a chance to comment. */
2372 if ((meta = is_objc_metadata (decl)))
2374 darwin_emit_objc_zeroed (fp, decl, name, size, DECL_ALIGN (decl), meta);
2378 /* Check that any initializer is valid. */
2379 gcc_assert ((DECL_INITIAL (decl) == NULL)
2380 || (DECL_INITIAL (decl) == error_mark_node)
2381 || initializer_zerop (DECL_INITIAL (decl)));
2383 gcc_assert (DECL_SECTION_NAME (decl) == NULL);
2384 gcc_assert (!DECL_COMMON (decl));
2386 /* Pick up the correct alignment. */
2387 if (!size || !align)
2388 align = DECL_ALIGN (decl);
2390 l2align = floor_log2 (align / BITS_PER_UNIT);
2391 gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT);
2393 last_assemble_variable_decl = decl;
2395 /* We would rather not have to check this here - but it seems that we might
2396 be passed a decl that should be in coalesced space. */
2399 /* Weak or COMDAT objects are put in mergeable sections. */
2400 darwin_emit_weak_or_comdat (fp, decl, name, size,
2405 /* If this is not public, then emit according to local rules. */
2408 darwin_emit_local_bss (fp, decl, name, size, l2align);
2412 /* So we have a public symbol (small item fudge for Java, see above). */
2413 if ((DARWIN_SECTION_ANCHORS && flag_section_anchors && size < BYTES_ZFILL)
2414 || (size && size <= 2))
2416 /* Put smaller objects in data, where the section anchors system can get
2417 them. However, if they are zero-sized punt them to yet a different
2418 section (that is not allowed to participate in anchoring). */
2421 fputs ("\t.section\t__DATA,__zobj_data\n", fp);
2422 in_section = darwin_sections[zobj_data_section];
2427 fputs ("\t.data\n", fp);
2428 in_section = data_section;
2432 fprintf (fp, "\t.align\t%u\n", l2align);
2434 assemble_name (fp, name);
2435 fprintf (fp, ":\n\t.space\t"HOST_WIDE_INT_PRINT_UNSIGNED"\n", size);
2440 unsigned int flags ;
2441 /* When we are on a non-section anchor target, we can get zero-sized
2442 items here. However, all we need to do is to bump them to one byte
2443 and the section alignment will take care of the rest. */
2444 snprintf (secnam, 64, "__DATA,__%spu_bss%u", ((size)?"":"zo_"), l2align);
2446 /* We can't anchor in zerofill sections, because we can't switch
2447 to them and emit a label. */
2448 flags = SECTION_BSS|SECTION_WRITE|SECTION_NO_ANCHOR;
2449 in_section = get_section (secnam, flags, NULL);
2450 fprintf (fp, "\t.zerofill %s,", secnam);
2451 assemble_name (fp, name);
2456 fprintf (fp, ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", size, l2align);
2458 fprintf (fp, ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", size);
2460 (* targetm.encode_section_info) (decl, DECL_RTL (decl), false);
2463 /* Output a chunk of common, with alignment specified (where the target
2466 darwin_asm_output_aligned_decl_common (FILE *fp, tree decl, const char *name,
2467 unsigned HOST_WIDE_INT size,
2470 unsigned int l2align;
2474 /* No corresponding var. */
2477 #ifdef DEBUG_DARWIN_MEM_ALLOCATORS
2478 fprintf (fp, "# adcom: %s (%d,%d) decl=0x0\n", name, (int)size, (int)align);
2480 darwin_emit_common (fp, name, size, align);
2484 one = DECL_ONE_ONLY (decl);
2485 weak = (DECL_P (decl)
2487 && !lookup_attribute ("weak_import",
2488 DECL_ATTRIBUTES (decl)));
2490 #ifdef DEBUG_DARWIN_MEM_ALLOCATORS
2491 fprintf (fp, "# adcom: %s (%lld,%d) ro %d cst %d stat %d com %d pub %d"
2492 " weak %d one %d init %lx\n",
2493 name, (long long)size, (int)align, TREE_READONLY (decl),
2494 TREE_CONSTANT (decl), TREE_STATIC (decl), DECL_COMMON (decl),
2495 TREE_PUBLIC (decl), weak, one, (unsigned long)DECL_INITIAL (decl));
2498 /* ObjC metadata can get put in BSS because varasm.c decides it's BSS
2499 before the target has a chance to comment. */
2500 if ((meta = is_objc_metadata (decl)))
2502 darwin_emit_objc_zeroed (fp, decl, name, size, DECL_ALIGN (decl), meta);
2506 /* We shouldn't be messing with this if the decl has a section name. */
2507 gcc_assert (DECL_SECTION_NAME (decl) == NULL);
2509 /* We would rather not have to check this here - but it seems that we might
2510 be passed a decl that should be in coalesced space. */
2513 /* Weak or COMDAT objects are put in mergable sections. */
2514 darwin_emit_weak_or_comdat (fp, decl, name, size,
2519 /* We should only get here for DECL_COMMON, with a zero init (and, in
2520 principle, only for public symbols too - although we deal with local
2523 /* Check the initializer is OK. */
2524 gcc_assert (DECL_COMMON (decl)
2525 && ((DECL_INITIAL (decl) == NULL)
2526 || (DECL_INITIAL (decl) == error_mark_node)
2527 || initializer_zerop (DECL_INITIAL (decl))));
2529 last_assemble_variable_decl = decl;
2531 if (!size || !align)
2532 align = DECL_ALIGN (decl);
2534 l2align = floor_log2 (align / BITS_PER_UNIT);
2535 /* Check we aren't asking for more aligment than the platform allows. */
2536 gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT);
2538 if (TREE_PUBLIC (decl) != 0)
2539 darwin_emit_common (fp, name, size, align);
2541 darwin_emit_local_bss (fp, decl, name, size, l2align);
2544 /* Output a chunk of BSS with alignment specfied. */
2546 darwin_asm_output_aligned_decl_local (FILE *fp, tree decl, const char *name,
2547 unsigned HOST_WIDE_INT size,
2550 unsigned long l2align;
2554 one = DECL_ONE_ONLY (decl);
2555 weak = (DECL_P (decl)
2557 && !lookup_attribute ("weak_import",
2558 DECL_ATTRIBUTES (decl)));
2560 #ifdef DEBUG_DARWIN_MEM_ALLOCATORS
2561 fprintf (fp, "# adloc: %s (%lld,%d) ro %d cst %d stat %d one %d pub %d"
2562 " weak %d init %lx\n",
2563 name, (long long)size, (int)align, TREE_READONLY (decl),
2564 TREE_CONSTANT (decl), TREE_STATIC (decl), one, TREE_PUBLIC (decl),
2565 weak , (unsigned long)DECL_INITIAL (decl));
2568 /* ObjC metadata can get put in BSS because varasm.c decides it's BSS
2569 before the target has a chance to comment. */
2570 if ((meta = is_objc_metadata (decl)))
2572 darwin_emit_objc_zeroed (fp, decl, name, size, DECL_ALIGN (decl), meta);
2576 /* We shouldn't be messing with this if the decl has a section name. */
2577 gcc_assert (DECL_SECTION_NAME (decl) == NULL);
2579 /* We would rather not have to check this here - but it seems that we might
2580 be passed a decl that should be in coalesced space. */
2583 /* Weak or COMDAT objects are put in mergable sections. */
2584 darwin_emit_weak_or_comdat (fp, decl, name, size,
2589 /* .. and it should be suitable for placement in local mem. */
2590 gcc_assert(!TREE_PUBLIC (decl) && !DECL_COMMON (decl));
2591 /* .. and any initializer must be all-zero. */
2592 gcc_assert ((DECL_INITIAL (decl) == NULL)
2593 || (DECL_INITIAL (decl) == error_mark_node)
2594 || initializer_zerop (DECL_INITIAL (decl)));
2596 last_assemble_variable_decl = decl;
2598 if (!size || !align)
2599 align = DECL_ALIGN (decl);
2601 l2align = floor_log2 (align / BITS_PER_UNIT);
2602 gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT);
2604 darwin_emit_local_bss (fp, decl, name, size, l2align);
2607 /* Emit an assembler directive to set visibility for a symbol. The
2608 only supported visibilities are VISIBILITY_DEFAULT and
2609 VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private
2610 extern". There is no MACH-O equivalent of ELF's
2611 VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */
2614 darwin_assemble_visibility (tree decl, int vis)
2616 if (vis == VISIBILITY_DEFAULT)
2618 else if (vis == VISIBILITY_HIDDEN)
2620 fputs ("\t.private_extern ", asm_out_file);
2621 assemble_name (asm_out_file,
2622 (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))));
2623 fputs ("\n", asm_out_file);
2626 warning (OPT_Wattributes, "internal and protected visibility attributes "
2627 "not supported in this configuration; ignored");
2630 /* VEC Used by darwin_asm_dwarf_section.
2631 Maybe a hash tab would be better here - but the intention is that this is
2632 a very short list (fewer than 16 items) and each entry should (ideally,
2633 eventually) only be presented once.
2635 A structure to hold a dwarf debug section used entry. */
2637 typedef struct GTY(()) dwarf_sect_used_entry {
2641 dwarf_sect_used_entry;
2643 DEF_VEC_O(dwarf_sect_used_entry);
2644 DEF_VEC_ALLOC_O(dwarf_sect_used_entry, gc);
2646 /* A list of used __DWARF sections. */
2647 static GTY (()) VEC (dwarf_sect_used_entry, gc) * dwarf_sect_names_table;
2649 /* This is called when we are asked to assemble a named section and the
2650 name begins with __DWARF,. We keep a list of the section names (without
2651 the __DWARF, prefix) and use this to emit our required start label on the
2652 first switch to each section. */
2655 darwin_asm_dwarf_section (const char *name, unsigned int flags,
2656 tree ARG_UNUSED (decl))
2661 dwarf_sect_used_entry *ref;
2663 gcc_assert ((flags & (SECTION_DEBUG | SECTION_NAMED))
2664 == (SECTION_DEBUG | SECTION_NAMED));
2665 /* We know that the name starts with __DWARF, */
2667 namelen = strchr (sname, ',') - sname;
2668 gcc_assert (namelen);
2669 if (dwarf_sect_names_table == NULL)
2670 dwarf_sect_names_table = VEC_alloc (dwarf_sect_used_entry, gc, 16);
2673 VEC_iterate (dwarf_sect_used_entry, dwarf_sect_names_table, i, ref);
2678 if (!strcmp (ref->name, sname))
2686 fprintf (asm_out_file, "\t.section %s\n", name);
2689 dwarf_sect_used_entry e;
2690 fprintf (asm_out_file, "Lsection%.*s:\n", namelen, sname);
2692 e.name = xstrdup (sname);
2693 VEC_safe_push (dwarf_sect_used_entry, gc, dwarf_sect_names_table, &e);
2697 /* Output a difference of two labels that will be an assembly time
2698 constant if the two labels are local. (.long lab1-lab2 will be
2699 very different if lab1 is at the boundary between two sections; it
2700 will be relocated according to the second section, not the first,
2701 so one ends up with a difference between labels in different
2702 sections, which is bad in the dwarf2 eh context for instance.) */
2704 static int darwin_dwarf_label_counter;
2707 darwin_asm_output_dwarf_delta (FILE *file, int size,
2708 const char *lab1, const char *lab2)
2710 int islocaldiff = (lab1[0] == '*' && lab1[1] == 'L'
2711 && lab2[0] == '*' && lab2[1] == 'L');
2712 const char *directive = (size == 8 ? ".quad" : ".long");
2715 fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter);
2717 fprintf (file, "\t%s\t", directive);
2719 assemble_name_raw (file, lab1);
2720 fprintf (file, "-");
2721 assemble_name_raw (file, lab2);
2723 fprintf (file, "\n\t%s L$set$%d", directive, darwin_dwarf_label_counter++);
2726 /* Output an offset in a DWARF section on Darwin. On Darwin, DWARF section
2727 offsets are not represented using relocs in .o files; either the
2728 section never leaves the .o file, or the linker or other tool is
2729 responsible for parsing the DWARF and updating the offsets. */
2732 darwin_asm_output_dwarf_offset (FILE *file, int size, const char * lab,
2738 gcc_assert (base->common.flags & SECTION_NAMED);
2739 gcc_assert (strncmp (base->named.name, "__DWARF,", 8) == 0);
2740 gcc_assert (strchr (base->named.name + 8, ','));
2742 namelen = strchr (base->named.name + 8, ',') - (base->named.name + 8);
2743 sprintf (sname, "*Lsection%.*s", namelen, base->named.name + 8);
2744 darwin_asm_output_dwarf_delta (file, size, lab, sname);
2747 /* Called from the within the TARGET_ASM_FILE_START for each target. */
2750 darwin_file_start (void)
2752 /* Nothing to do. */
2755 /* Called for the TARGET_ASM_FILE_END hook.
2756 Emit the mach-o pic indirection data, the lto data and, finally a flag
2757 to tell the linker that it can break the file object into sections and
2758 move those around for efficiency. */
2761 darwin_file_end (void)
2763 machopic_finish (asm_out_file);
2764 if (strcmp (lang_hooks.name, "GNU C++") == 0)
2766 switch_to_section (darwin_sections[constructor_section]);
2767 switch_to_section (darwin_sections[destructor_section]);
2768 ASM_OUTPUT_ALIGN (asm_out_file, 1);
2771 /* If there was LTO assembler output, append it to asm_out_file. */
2772 if (lto_asm_out_name)
2775 char *buf, *lto_asm_txt;
2777 /* Shouldn't be here if we failed to switch back. */
2778 gcc_assert (! saved_asm_out_file);
2780 lto_asm_out_file = fopen (lto_asm_out_name, "r");
2781 if (lto_asm_out_file == NULL)
2782 fatal_error ("failed to open temporary file %s with LTO output",
2784 fseek (lto_asm_out_file, 0, SEEK_END);
2785 n = ftell (lto_asm_out_file);
2788 fseek (lto_asm_out_file, 0, SEEK_SET);
2789 lto_asm_txt = buf = (char *) xmalloc (n + 1);
2790 while (fgets (lto_asm_txt, n, lto_asm_out_file))
2791 fputs (lto_asm_txt, asm_out_file);
2792 /* Put a termination label. */
2793 fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n",
2794 LTO_SEGMENT_NAME, LTO_SECTS_SECTION);
2795 fprintf (asm_out_file, "L_GNU_LTO%d:\t;# end of lto\n",
2797 /* Make sure our termination label stays in this section. */
2798 fputs ("\t.space\t1\n", asm_out_file);
2801 /* Remove the temporary file. */
2802 fclose (lto_asm_out_file);
2803 unlink_if_ordinary (lto_asm_out_name);
2804 free (lto_asm_out_name);
2807 /* Output the names and indices. */
2808 if (lto_section_names && VEC_length (darwin_lto_section_e, lto_section_names))
2811 darwin_lto_section_e *ref;
2812 /* For now, we'll make the offsets 4 bytes and unaligned - we'll fix
2813 the latter up ourselves. */
2814 const char *op = integer_asm_op (4,0);
2816 /* Emit the names. */
2817 fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n",
2818 LTO_SEGMENT_NAME, LTO_NAMES_SECTION);
2819 FOR_EACH_VEC_ELT (darwin_lto_section_e, lto_section_names, count, ref)
2821 fprintf (asm_out_file, "L_GNU_LTO_NAME%d:\n", count);
2822 /* We have to jump through hoops to get the values of the intra-section
2824 fprintf (asm_out_file,
2825 "\t.set L$gnu$lto$noff%d,L_GNU_LTO_NAME%d-L_GNU_LTO_NAME0\n",
2827 fprintf (asm_out_file,
2828 "\t.set L$gnu$lto$nsiz%d,L_GNU_LTO_NAME%d-L_GNU_LTO_NAME%d\n",
2829 count, count+1, count);
2830 fprintf (asm_out_file, "\t.asciz\t\"%s\"\n", ref->sectname);
2832 fprintf (asm_out_file, "L_GNU_LTO_NAME%d:\t;# end\n", lto_section_num);
2833 /* make sure our termination label stays in this section. */
2834 fputs ("\t.space\t1\n", asm_out_file);
2836 /* Emit the Index. */
2837 fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n",
2838 LTO_SEGMENT_NAME, LTO_INDEX_SECTION);
2839 fputs ("\t.align\t2\n", asm_out_file);
2840 fputs ("# Section offset, Section length, Name offset, Name length\n",
2842 FOR_EACH_VEC_ELT (darwin_lto_section_e, lto_section_names, count, ref)
2844 fprintf (asm_out_file, "%s L$gnu$lto$offs%d\t;# %s\n",
2845 op, count, ref->sectname);
2846 fprintf (asm_out_file, "%s L$gnu$lto$size%d\n", op, count);
2847 fprintf (asm_out_file, "%s L$gnu$lto$noff%d\n", op, count);
2848 fprintf (asm_out_file, "%s L$gnu$lto$nsiz%d\n", op, count);
2852 /* If we have section anchors, then we must prevent the linker from
2853 re-arranging data. */
2854 if (!DARWIN_SECTION_ANCHORS || !flag_section_anchors)
2855 fprintf (asm_out_file, "\t.subsections_via_symbols\n");
2858 /* TODO: Add a language hook for identifying if a decl is a vtable. */
2859 #define DARWIN_VTABLE_P(DECL) 0
2861 /* Cross-module name binding. Darwin does not support overriding
2862 functions at dynamic-link time, except for vtables in kexts. */
2865 darwin_binds_local_p (const_tree decl)
2867 return default_binds_local_p_1 (decl,
2868 TARGET_KEXTABI && DARWIN_VTABLE_P (decl));
2871 /* The Darwin's implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
2872 anchor relative to ".", the current section position. We cannot use
2873 the default one because ASM_OUTPUT_DEF is wrong for Darwin. */
2875 darwin_asm_output_anchor (rtx symbol)
2877 fprintf (asm_out_file, "\t.set\t");
2878 assemble_name (asm_out_file, XSTR (symbol, 0));
2879 fprintf (asm_out_file, ", . + " HOST_WIDE_INT_PRINT_DEC "\n",
2880 SYMBOL_REF_BLOCK_OFFSET (symbol));
2883 /* Disable section anchoring on any section containing a zero-sized
2886 darwin_use_anchors_for_symbol_p (const_rtx symbol)
2888 if (DARWIN_SECTION_ANCHORS && flag_section_anchors)
2891 /* If the section contains a zero-sized object it's ineligible. */
2892 sect = SYMBOL_REF_BLOCK (symbol)->sect;
2893 /* This should have the effect of disabling anchors for vars that follow
2894 any zero-sized one, in a given section. */
2895 if (sect->common.flags & SECTION_NO_ANCHOR)
2898 /* Also check the normal reasons for suppressing. */
2899 return default_use_anchors_for_symbol_p (symbol);
2905 /* Set the darwin specific attributes on TYPE. */
2907 darwin_set_default_type_attributes (tree type)
2909 if (darwin_ms_struct
2910 && TREE_CODE (type) == RECORD_TYPE)
2911 TYPE_ATTRIBUTES (type) = tree_cons (get_identifier ("ms_struct"),
2913 TYPE_ATTRIBUTES (type));
2916 /* True, iff we're generating code for loadable kernel extensions. */
2919 darwin_kextabi_p (void) {
2920 return flag_apple_kext;
2924 darwin_override_options (void)
2926 /* Keep track of which (major) version we're generating code for. */
2927 if (darwin_macosx_version_min)
2929 if (strverscmp (darwin_macosx_version_min, "10.6") >= 0)
2930 generating_for_darwin_version = 10;
2931 else if (strverscmp (darwin_macosx_version_min, "10.5") >= 0)
2932 generating_for_darwin_version = 9;
2934 /* Earlier versions are not specifically accounted, until required. */
2937 /* Don't emit DWARF3/4 unless specifically selected. This is a
2938 workaround for tool bugs. */
2939 if (!global_options_set.x_dwarf_strict)
2942 /* Do not allow unwind tables to be generated by default for m32.
2943 fnon-call-exceptions will override this, regardless of what we do. */
2944 if (generating_for_darwin_version < 10
2945 && !global_options_set.x_flag_asynchronous_unwind_tables
2947 global_options.x_flag_asynchronous_unwind_tables = 0;
2949 /* Disable -freorder-blocks-and-partition when unwind tables are being
2950 emitted for Darwin < 9 (OSX 10.5).
2951 The strategy is, "Unless the User has specifically set/unset an unwind
2952 flag we will switch off -freorder-blocks-and-partition when unwind tables
2953 will be generated". If the User specifically sets flags... we assume
2954 (s)he knows why... */
2955 if (generating_for_darwin_version < 9
2956 && global_options_set.x_flag_reorder_blocks_and_partition
2957 && ((global_options.x_flag_exceptions /* User, c++, java */
2958 && !global_options_set.x_flag_exceptions) /* User specified... */
2959 || (global_options.x_flag_unwind_tables
2960 && !global_options_set.x_flag_unwind_tables)
2961 || (global_options.x_flag_non_call_exceptions
2962 && !global_options_set.x_flag_non_call_exceptions)
2963 || (global_options.x_flag_asynchronous_unwind_tables
2964 && !global_options_set.x_flag_asynchronous_unwind_tables)))
2966 inform (input_location,
2967 "-freorder-blocks-and-partition does not work with exceptions "
2968 "on this architecture");
2969 flag_reorder_blocks_and_partition = 0;
2970 flag_reorder_blocks = 1;
2973 if (flag_mkernel || flag_apple_kext)
2975 /* -mkernel implies -fapple-kext for C++ */
2976 if (strcmp (lang_hooks.name, "GNU C++") == 0)
2977 flag_apple_kext = 1;
2981 /* No EH in kexts. */
2982 flag_exceptions = 0;
2983 /* No -fnon-call-exceptions data in kexts. */
2984 flag_non_call_exceptions = 0;
2985 /* so no tables either.. */
2986 flag_unwind_tables = 0;
2987 flag_asynchronous_unwind_tables = 0;
2988 /* We still need to emit branch islands for kernel context. */
2989 darwin_emit_branch_islands = true;
2992 if (flag_var_tracking
2993 && generating_for_darwin_version >= 9
2994 && (flag_gtoggle ? (debug_info_level == DINFO_LEVEL_NONE)
2995 : (debug_info_level >= DINFO_LEVEL_NORMAL))
2996 && write_symbols == DWARF2_DEBUG)
2997 flag_var_tracking_uninit = 1;
2999 if (MACHO_DYNAMIC_NO_PIC_P)
3002 warning_at (UNKNOWN_LOCATION, 0,
3003 "%<-mdynamic-no-pic%> overrides %<-fpic%>, %<-fPIC%>,"
3004 " %<-fpie%> or %<-fPIE%>");
3007 else if (flag_pic == 1)
3009 /* Darwin's -fpic is -fPIC. */
3013 /* It is assumed that branch island stubs are needed for earlier systems. */
3014 if (generating_for_darwin_version < 9)
3015 darwin_emit_branch_islands = true;
3017 emit_aligned_common = true; /* Later systems can support aligned common. */
3019 /* The c_dialect...() macros are not available to us here. */
3020 darwin_running_cxx = (strstr (lang_hooks.name, "C++") != 0);
3024 /* Add $LDBL128 suffix to long double builtins for ppc darwin. */
3027 darwin_patch_builtin (enum built_in_function fncode)
3029 tree fn = builtin_decl_explicit (fncode);
3036 sym = DECL_ASSEMBLER_NAME (fn);
3037 newname = ACONCAT (("_", IDENTIFIER_POINTER (sym), "$LDBL128", NULL));
3039 set_user_assembler_name (fn, newname);
3041 fn = builtin_decl_implicit (fncode);
3043 set_user_assembler_name (fn, newname);
3047 darwin_patch_builtins (void)
3049 if (LONG_DOUBLE_TYPE_SIZE != 128)
3052 #define PATCH_BUILTIN(fncode) darwin_patch_builtin (fncode);
3053 #define PATCH_BUILTIN_NO64(fncode) \
3054 if (!TARGET_64BIT) \
3055 darwin_patch_builtin (fncode);
3056 #define PATCH_BUILTIN_VARIADIC(fncode) \
3058 && (strverscmp (darwin_macosx_version_min, "10.3.9") >= 0)) \
3059 darwin_patch_builtin (fncode);
3060 #include "darwin-ppc-ldouble-patch.def"
3061 #undef PATCH_BUILTIN
3062 #undef PATCH_BUILTIN_NO64
3063 #undef PATCH_BUILTIN_VARIADIC
3067 /* CFStrings implementation. */
3068 static GTY(()) tree cfstring_class_reference = NULL_TREE;
3069 static GTY(()) tree cfstring_type_node = NULL_TREE;
3070 static GTY(()) tree ccfstring_type_node = NULL_TREE;
3071 static GTY(()) tree pccfstring_type_node = NULL_TREE;
3072 static GTY(()) tree pcint_type_node = NULL_TREE;
3073 static GTY(()) tree pcchar_type_node = NULL_TREE;
3075 static enum built_in_function darwin_builtin_cfstring;
3077 /* Store all constructed constant CFStrings in a hash table so that
3078 they get uniqued properly. */
3080 typedef struct GTY (()) cfstring_descriptor {
3081 /* The string literal. */
3083 /* The resulting constant CFString. */
3085 } cfstring_descriptor;
3087 static GTY ((param_is (struct cfstring_descriptor))) htab_t cfstring_htab;
3089 static hashval_t cfstring_hash (const void *);
3090 static int cfstring_eq (const void *, const void *);
3093 add_builtin_field_decl (tree type, const char *name, tree **chain)
3095 tree field = build_decl (BUILTINS_LOCATION, FIELD_DECL,
3096 get_identifier (name), type);
3100 *chain = &DECL_CHAIN (field);
3106 darwin_init_cfstring_builtins (unsigned builtin_cfstring)
3108 tree cfsfun, fields, pccfstring_ftype_pcchar;
3111 darwin_builtin_cfstring =
3112 (enum built_in_function) builtin_cfstring;
3114 /* struct __builtin_CFString {
3115 const int *isa; (will point at
3116 int flags; __CFConstantStringClassReference)
3121 pcint_type_node = build_pointer_type
3122 (build_qualified_type (integer_type_node, TYPE_QUAL_CONST));
3124 pcchar_type_node = build_pointer_type
3125 (build_qualified_type (char_type_node, TYPE_QUAL_CONST));
3127 cfstring_type_node = (*lang_hooks.types.make_type) (RECORD_TYPE);
3129 /* Have to build backwards for finish struct. */
3130 fields = add_builtin_field_decl (long_integer_type_node, "length", &chain);
3131 add_builtin_field_decl (pcchar_type_node, "str", &chain);
3132 add_builtin_field_decl (integer_type_node, "flags", &chain);
3133 add_builtin_field_decl (pcint_type_node, "isa", &chain);
3134 finish_builtin_struct (cfstring_type_node, "__builtin_CFString",
3137 /* const struct __builtin_CFstring *
3138 __builtin___CFStringMakeConstantString (const char *); */
3140 ccfstring_type_node = build_qualified_type
3141 (cfstring_type_node, TYPE_QUAL_CONST);
3142 pccfstring_type_node = build_pointer_type (ccfstring_type_node);
3143 pccfstring_ftype_pcchar = build_function_type_list
3144 (pccfstring_type_node, pcchar_type_node, NULL_TREE);
3146 cfsfun = build_decl (BUILTINS_LOCATION, FUNCTION_DECL,
3147 get_identifier ("__builtin___CFStringMakeConstantString"),
3148 pccfstring_ftype_pcchar);
3150 TREE_PUBLIC (cfsfun) = 1;
3151 DECL_EXTERNAL (cfsfun) = 1;
3152 DECL_ARTIFICIAL (cfsfun) = 1;
3153 /* Make a lang-specific section - dup_lang_specific_decl makes a new node
3154 in place of the existing, which may be NULL. */
3155 DECL_LANG_SPECIFIC (cfsfun) = NULL;
3156 (*lang_hooks.dup_lang_specific_decl) (cfsfun);
3157 DECL_BUILT_IN_CLASS (cfsfun) = BUILT_IN_MD;
3158 DECL_FUNCTION_CODE (cfsfun) = darwin_builtin_cfstring;
3159 lang_hooks.builtin_function (cfsfun);
3161 /* extern int __CFConstantStringClassReference[]; */
3162 cfstring_class_reference = build_decl (BUILTINS_LOCATION, VAR_DECL,
3163 get_identifier ("__CFConstantStringClassReference"),
3164 build_array_type (integer_type_node, NULL_TREE));
3166 TREE_PUBLIC (cfstring_class_reference) = 1;
3167 DECL_ARTIFICIAL (cfstring_class_reference) = 1;
3168 (*lang_hooks.decls.pushdecl) (cfstring_class_reference);
3169 DECL_EXTERNAL (cfstring_class_reference) = 1;
3170 rest_of_decl_compilation (cfstring_class_reference, 0, 0);
3172 /* Initialize the hash table used to hold the constant CFString objects. */
3173 cfstring_htab = htab_create_ggc (31, cfstring_hash, cfstring_eq, NULL);
3175 return cfstring_type_node;
3179 darwin_fold_builtin (tree fndecl, int n_args, tree *argp,
3180 bool ARG_UNUSED (ignore))
3182 unsigned int fcode = DECL_FUNCTION_CODE (fndecl);
3184 if (fcode == darwin_builtin_cfstring)
3186 if (!darwin_constant_cfstrings)
3188 error ("built-in function %qD requires the"
3189 " %<-mconstant-cfstrings%> flag", fndecl);
3190 return error_mark_node;
3195 error ("built-in function %qD takes one argument only", fndecl);
3196 return error_mark_node;
3199 return darwin_build_constant_cfstring (*argp);
3206 darwin_rename_builtins (void)
3208 /* The system ___divdc3 routine in libSystem on darwin10 is not
3209 accurate to 1ulp, ours is, so we avoid ever using the system name
3210 for this routine and instead install a non-conflicting name that
3213 When -ffast-math or -funsafe-math-optimizations is given, we can
3214 use the faster version. */
3215 if (!flag_unsafe_math_optimizations)
3217 enum built_in_function dcode
3218 = (enum built_in_function)(BUILT_IN_COMPLEX_DIV_MIN
3219 + DCmode - MIN_MODE_COMPLEX_FLOAT);
3220 tree fn = builtin_decl_explicit (dcode);
3221 /* Fortran and c call TARGET_INIT_BUILTINS and
3222 TARGET_INIT_LIBFUNCS at different times, so we have to put a
3223 call into each to ensure that at least one of them is called
3224 after build_common_builtin_nodes. A better fix is to add a
3225 new hook to run after build_common_builtin_nodes runs. */
3227 set_user_assembler_name (fn, "___ieee_divdc3");
3228 fn = builtin_decl_implicit (dcode);
3230 set_user_assembler_name (fn, "___ieee_divdc3");
3235 cfstring_hash (const void *ptr)
3237 tree str = ((const struct cfstring_descriptor *)ptr)->literal;
3238 const unsigned char *p = (const unsigned char *) TREE_STRING_POINTER (str);
3239 int i, len = TREE_STRING_LENGTH (str);
3242 for (i = 0; i < len; i++)
3243 h = ((h * 613) + p[i]);
3249 cfstring_eq (const void *ptr1, const void *ptr2)
3251 tree str1 = ((const struct cfstring_descriptor *)ptr1)->literal;
3252 tree str2 = ((const struct cfstring_descriptor *)ptr2)->literal;
3253 int len1 = TREE_STRING_LENGTH (str1);
3255 return (len1 == TREE_STRING_LENGTH (str2)
3256 && !memcmp (TREE_STRING_POINTER (str1), TREE_STRING_POINTER (str2),
3261 darwin_build_constant_cfstring (tree str)
3263 struct cfstring_descriptor *desc, key;
3269 error ("CFString literal is missing");
3270 return error_mark_node;
3275 if (TREE_CODE (str) == ADDR_EXPR)
3276 str = TREE_OPERAND (str, 0);
3278 if (TREE_CODE (str) != STRING_CST)
3280 error ("CFString literal expression is not a string constant");
3281 return error_mark_node;
3284 /* Perhaps we already constructed a constant CFString just like this one? */
3286 loc = htab_find_slot (cfstring_htab, &key, INSERT);
3287 desc = (struct cfstring_descriptor *) *loc;
3291 tree var, constructor, field;
3292 VEC(constructor_elt,gc) *v = NULL;
3293 int length = TREE_STRING_LENGTH (str) - 1;
3295 if (darwin_warn_nonportable_cfstrings)
3297 const char *s = TREE_STRING_POINTER (str);
3300 for (l = 0; l < length; l++)
3301 if (!s[l] || !isascii (s[l]))
3303 warning (darwin_warn_nonportable_cfstrings, "%s in CFString literal",
3304 s[l] ? "non-ASCII character" : "embedded NUL");
3309 *loc = desc = ggc_alloc_cleared_cfstring_descriptor ();
3310 desc->literal = str;
3313 field = TYPE_FIELDS (ccfstring_type_node);
3314 CONSTRUCTOR_APPEND_ELT(v, NULL_TREE,
3315 build1 (ADDR_EXPR, TREE_TYPE (field),
3316 cfstring_class_reference));
3318 field = DECL_CHAIN (field);
3319 CONSTRUCTOR_APPEND_ELT(v, NULL_TREE,
3320 build_int_cst (TREE_TYPE (field), 0x000007c8));
3322 field = DECL_CHAIN (field);
3323 CONSTRUCTOR_APPEND_ELT(v, NULL_TREE,
3324 build1 (ADDR_EXPR, TREE_TYPE (field), str));
3326 field = DECL_CHAIN (field);
3327 CONSTRUCTOR_APPEND_ELT(v, NULL_TREE,
3328 build_int_cst (TREE_TYPE (field), length));
3330 constructor = build_constructor (ccfstring_type_node, v);
3331 TREE_READONLY (constructor) = 1;
3332 TREE_CONSTANT (constructor) = 1;
3333 TREE_STATIC (constructor) = 1;
3335 /* Fromage: The C++ flavor of 'build_unary_op' expects constructor nodes
3336 to have the TREE_HAS_CONSTRUCTOR (...) bit set. However, this file is
3337 being built without any knowledge of C++ tree accessors; hence, we shall
3338 use the generic accessor that TREE_HAS_CONSTRUCTOR actually maps to! */
3339 if (darwin_running_cxx)
3340 TREE_LANG_FLAG_4 (constructor) = 1; /* TREE_HAS_CONSTRUCTOR */
3342 /* Create an anonymous global variable for this CFString. */
3343 var = build_decl (input_location, CONST_DECL,
3344 NULL, TREE_TYPE (constructor));
3345 DECL_ARTIFICIAL (var) = 1;
3346 TREE_STATIC (var) = 1;
3347 DECL_INITIAL (var) = constructor;
3348 /* FIXME: This should use a translation_unit_decl to indicate file scope. */
3349 DECL_CONTEXT (var) = NULL_TREE;
3350 desc->constructor = var;
3353 addr = build1 (ADDR_EXPR, pccfstring_type_node, desc->constructor);
3354 TREE_CONSTANT (addr) = 1;
3360 darwin_cfstring_p (tree str)
3362 struct cfstring_descriptor key;
3370 if (TREE_CODE (str) == ADDR_EXPR)
3371 str = TREE_OPERAND (str, 0);
3373 if (TREE_CODE (str) != STRING_CST)
3377 loc = htab_find_slot (cfstring_htab, &key, NO_INSERT);
3386 darwin_enter_string_into_cfstring_table (tree str)
3388 struct cfstring_descriptor key;
3392 loc = htab_find_slot (cfstring_htab, &key, INSERT);
3396 *loc = ggc_alloc_cleared_cfstring_descriptor ();
3397 ((struct cfstring_descriptor *)*loc)->literal = str;
3401 /* Choose named function section based on its frequency. */
3404 darwin_function_section (tree decl, enum node_frequency freq,
3405 bool startup, bool exit)
3407 /* Decide if we need to put this in a coalescable section. */
3410 && (!DECL_ATTRIBUTES (decl)
3411 || !lookup_attribute ("weak_import",
3412 DECL_ATTRIBUTES (decl))));
3414 /* If there is a specified section name, we should not be trying to
3416 if (decl && DECL_SECTION_NAME (decl) != NULL_TREE)
3417 return get_named_section (decl, NULL, 0);
3419 /* Default when there is no function re-ordering. */
3420 if (!flag_reorder_functions)
3422 ? darwin_sections[text_coal_section]
3425 /* Startup code should go to startup subsection unless it is
3426 unlikely executed (this happens especially with function splitting
3427 where we can split away unnecesary parts of static constructors). */
3428 if (startup && freq != NODE_FREQUENCY_UNLIKELY_EXECUTED)
3430 ? darwin_sections[text_startup_coal_section]
3431 : darwin_sections[text_startup_section];
3433 /* Similarly for exit. */
3434 if (exit && freq != NODE_FREQUENCY_UNLIKELY_EXECUTED)
3436 ? darwin_sections[text_exit_coal_section]
3437 : darwin_sections[text_exit_section];
3439 /* Group cold functions together, similarly for hot code. */
3442 case NODE_FREQUENCY_UNLIKELY_EXECUTED:
3444 ? darwin_sections[text_cold_coal_section]
3445 : darwin_sections[text_cold_section];
3447 case NODE_FREQUENCY_HOT:
3449 ? darwin_sections[text_hot_coal_section]
3450 : darwin_sections[text_hot_section];
3454 ? darwin_sections[text_coal_section]
3460 /* When a function is partitioned between sections, we need to insert a label
3461 at the start of each new chunk - so that it may become a valid 'atom' for
3462 eh and debug purposes. Without this the linker will emit warnings if one
3463 tries to add line location information (since the switched fragment will
3467 darwin_function_switched_text_sections (FILE *fp, tree decl, bool new_is_cold)
3470 snprintf (buf, 128, "%s%s",new_is_cold?"__cold_sect_of_":"__hot_sect_of_",
3471 IDENTIFIER_POINTER (DECL_NAME (decl)));
3472 /* Make sure we pick up all the relevant quotes etc. */
3473 assemble_name_raw (fp, (const char *) buf);
3477 #include "gt-darwin.h"