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
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"
31 #include "insn-config.h"
32 #include "conditions.h"
33 #include "insn-flags.h"
35 #include "insn-attr.h"
42 #include "langhooks.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. */
83 section * darwin_sections[NUM_DARWIN_SECTIONS];
85 /* True if we're setting __attribute__ ((ms_struct)). */
86 int darwin_ms_struct = false;
88 /* A get_unnamed_section callback used to switch to an ObjC section.
89 DIRECTIVE is as for output_section_asm_op. */
92 output_objc_section_asm_op (const void *directive)
94 static bool been_here = false;
98 static const enum darwin_section_enum tomark[] =
100 /* written, cold -> hot */
101 objc_cat_cls_meth_section,
102 objc_cat_inst_meth_section,
103 objc_string_object_section,
104 objc_constant_string_object_section,
105 objc_selector_refs_section,
106 objc_selector_fixup_section,
107 objc_cls_refs_section,
109 objc_meta_class_section,
110 /* shared, hot -> cold */
111 objc_cls_meth_section,
112 objc_inst_meth_section,
113 objc_protocol_section,
114 objc_class_names_section,
115 objc_meth_var_types_section,
116 objc_meth_var_names_section,
117 objc_category_section,
118 objc_class_vars_section,
119 objc_instance_vars_section,
120 objc_module_info_section,
126 for (i = 0; i < ARRAY_SIZE (tomark); i++)
127 switch_to_section (darwin_sections[tomark[i]]);
129 output_section_asm_op (directive);
132 /* Implement TARGET_ASM_INIT_SECTIONS. */
135 darwin_init_sections (void)
137 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) \
138 darwin_sections[NAME] = \
139 get_unnamed_section (FLAGS, (OBJC \
140 ? output_objc_section_asm_op \
141 : output_section_asm_op), \
143 #include "config/darwin-sections.def"
146 readonly_data_section = darwin_sections[const_section];
147 exception_section = darwin_sections[darwin_exception_section];
148 eh_frame_section = darwin_sections[darwin_eh_frame_section];
152 name_needs_quotes (const char *name)
155 while ((c = *name++) != '\0')
156 if (! ISIDNUM (c) && c != '.' && c != '$')
161 /* Return true if SYM_REF can be used without an indirection. */
163 machopic_symbol_defined_p (rtx sym_ref)
165 if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED)
168 /* If a symbol references local and is not an extern to this
169 file, then the symbol might be able to declared as defined. */
170 if (SYMBOL_REF_LOCAL_P (sym_ref) && ! SYMBOL_REF_EXTERNAL_P (sym_ref))
172 /* If the symbol references a variable and the variable is a
173 common symbol, then this symbol is not defined. */
174 if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_VARIABLE)
176 tree decl = SYMBOL_REF_DECL (sym_ref);
179 if (DECL_COMMON (decl))
187 /* This module assumes that (const (symbol_ref "foo")) is a legal pic
188 reference, which will not be changed. */
190 enum machopic_addr_class
191 machopic_classify_symbol (rtx sym_ref)
195 function_p = SYMBOL_REF_FUNCTION_P (sym_ref);
196 if (machopic_symbol_defined_p (sym_ref))
198 ? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA);
201 ? MACHOPIC_UNDEFINED_FUNCTION : MACHOPIC_UNDEFINED_DATA);
204 #ifndef TARGET_FIX_AND_CONTINUE
205 #define TARGET_FIX_AND_CONTINUE 0
208 /* Indicate when fix-and-continue style code generation is being used
209 and when a reference to data should be indirected so that it can be
210 rebound in a new translation unit to reference the original instance
211 of that data. Symbol names that are for code generation local to
212 the translation unit are bound to the new translation unit;
213 currently this means symbols that begin with L or _OBJC_;
214 otherwise, we indicate that an indirect reference should be made to
215 permit the runtime to rebind new instances of the translation unit
216 to the original instance of the data. */
219 indirect_data (rtx sym_ref)
224 /* If we aren't generating fix-and-continue code, don't do anything
226 if (TARGET_FIX_AND_CONTINUE == 0)
229 /* Otherwise, all symbol except symbols that begin with L or _OBJC_
230 are indirected. Symbols that begin with L and _OBJC_ are always
231 bound to the current translation unit as they are used for
232 generated local data of the translation unit. */
234 name = XSTR (sym_ref, 0);
236 lprefix = (((name[0] == '*' || name[0] == '&')
237 && (name[1] == 'L' || (name[1] == '"' && name[2] == 'L')))
238 || (strncmp (name, "_OBJC_", 6) == 0));
245 machopic_data_defined_p (rtx sym_ref)
247 if (indirect_data (sym_ref))
250 switch (machopic_classify_symbol (sym_ref))
252 case MACHOPIC_DEFINED_DATA:
253 case MACHOPIC_DEFINED_FUNCTION:
261 machopic_define_symbol (rtx mem)
265 gcc_assert (GET_CODE (mem) == MEM);
266 sym_ref = XEXP (mem, 0);
267 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
270 /* Return either ORIG or:
272 (const:P (unspec:P [ORIG] UNSPEC_MACHOPIC_OFFSET))
274 depending on MACHO_DYNAMIC_NO_PIC_P. */
276 machopic_gen_offset (rtx orig)
278 if (MACHO_DYNAMIC_NO_PIC_P)
282 /* Play games to avoid marking the function as needing pic if we
283 are being called as part of the cost-estimation process. */
284 if (current_ir_type () != IR_GIMPLE || currently_expanding_to_rtl)
285 crtl->uses_pic_offset_table = 1;
286 orig = gen_rtx_UNSPEC (Pmode, gen_rtvec (1, orig),
287 UNSPEC_MACHOPIC_OFFSET);
288 return gen_rtx_CONST (Pmode, orig);
292 static GTY(()) const char * function_base_func_name;
293 static GTY(()) int current_pic_label_num;
296 machopic_output_function_base_name (FILE *file)
298 const char *current_name;
300 /* If dynamic-no-pic is on, we should not get here. */
301 gcc_assert (!MACHO_DYNAMIC_NO_PIC_P);
303 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
304 if (function_base_func_name != current_name)
306 ++current_pic_label_num;
307 function_base_func_name = current_name;
309 fprintf (file, "\"L%011d$pb\"", current_pic_label_num);
312 /* The suffix attached to non-lazy pointer symbols. */
313 #define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr"
314 /* The suffix attached to stub symbols. */
315 #define STUB_SUFFIX "$stub"
317 typedef struct GTY (()) machopic_indirection
319 /* The SYMBOL_REF for the entity referenced. */
321 /* The name of the stub or non-lazy pointer. */
322 const char * ptr_name;
323 /* True iff this entry is for a stub (as opposed to a non-lazy
326 /* True iff this stub or pointer pointer has been referenced. */
328 } machopic_indirection;
330 /* A table mapping stub names and non-lazy pointer names to
331 SYMBOL_REFs for the stubbed-to and pointed-to entities. */
333 static GTY ((param_is (struct machopic_indirection))) htab_t
334 machopic_indirections;
336 /* Return a hash value for a SLOT in the indirections hash table. */
339 machopic_indirection_hash (const void *slot)
341 const machopic_indirection *p = (const machopic_indirection *) slot;
342 return htab_hash_string (p->ptr_name);
345 /* Returns true if the KEY is the same as that associated with
349 machopic_indirection_eq (const void *slot, const void *key)
351 return strcmp (((const machopic_indirection *) slot)->ptr_name,
352 (const char *) key) == 0;
355 /* Return the name of the non-lazy pointer (if STUB_P is false) or
356 stub (if STUB_B is true) corresponding to the given name. */
359 machopic_indirection_name (rtx sym_ref, bool stub_p)
362 const char *name = XSTR (sym_ref, 0);
363 size_t namelen = strlen (name);
364 machopic_indirection *p;
368 const char *prefix = user_label_prefix;
369 const char *quote = "";
372 id = maybe_get_identifier (name);
377 while (IDENTIFIER_TRANSPARENT_ALIAS (id))
378 id = TREE_CHAIN (id);
381 name = IDENTIFIER_POINTER (id);
382 namelen = strlen (name);
393 needs_quotes = name_needs_quotes (name);
400 suffix = STUB_SUFFIX;
402 suffix = NON_LAZY_POINTER_SUFFIX;
404 buffer = XALLOCAVEC (char, strlen ("&L")
411 /* Construct the name of the non-lazy pointer or stub. */
412 sprintf (buffer, "&%sL%s%s%s%s", quote, prefix, name, suffix, quote);
414 if (!machopic_indirections)
415 machopic_indirections = htab_create_ggc (37,
416 machopic_indirection_hash,
417 machopic_indirection_eq,
420 slot = htab_find_slot_with_hash (machopic_indirections, buffer,
421 htab_hash_string (buffer), INSERT);
424 p = (machopic_indirection *) *slot;
428 p = (machopic_indirection *) ggc_alloc (sizeof (machopic_indirection));
430 p->ptr_name = xstrdup (buffer);
439 /* Return the name of the stub for the mcount function. */
442 machopic_mcount_stub_name (void)
444 rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "*mcount");
445 return machopic_indirection_name (symbol, /*stub_p=*/true);
448 /* If NAME is the name of a stub or a non-lazy pointer , mark the stub
449 or non-lazy pointer as used -- and mark the object to which the
450 pointer/stub refers as used as well, since the pointer/stub will
451 emit a reference to it. */
454 machopic_validate_stub_or_non_lazy_ptr (const char *name)
456 machopic_indirection *p;
458 p = ((machopic_indirection *)
459 (htab_find_with_hash (machopic_indirections, name,
460 htab_hash_string (name))));
463 const char *real_name;
468 /* Do what output_addr_const will do when we actually call it. */
469 if (SYMBOL_REF_DECL (p->symbol))
470 mark_decl_referenced (SYMBOL_REF_DECL (p->symbol));
472 real_name = targetm.strip_name_encoding (XSTR (p->symbol, 0));
474 id = maybe_get_identifier (real_name);
476 mark_referenced (id);
480 /* Transform ORIG, which may be any data source, to the corresponding
481 source using indirections. */
484 machopic_indirect_data_reference (rtx orig, rtx reg)
488 if (! MACHOPIC_INDIRECT)
491 if (GET_CODE (orig) == SYMBOL_REF)
493 int defined = machopic_data_defined_p (orig);
495 if (defined && MACHO_DYNAMIC_NO_PIC_P)
497 #if defined (TARGET_TOC)
498 /* Create a new register for CSE opportunities. */
499 rtx hi_reg = (!can_create_pseudo_p () ? reg : gen_reg_rtx (Pmode));
500 emit_insn (gen_macho_high (hi_reg, orig));
501 emit_insn (gen_macho_low (reg, hi_reg, orig));
503 /* some other cpu -- writeme! */
510 #if defined (TARGET_TOC) || defined (HAVE_lo_sum)
511 rtx offset = machopic_gen_offset (orig);
514 #if defined (TARGET_TOC) /* i.e., PowerPC */
515 rtx hi_sum_reg = (!can_create_pseudo_p ()
517 : gen_reg_rtx (Pmode));
521 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
522 gen_rtx_PLUS (Pmode, pic_offset_table_rtx,
523 gen_rtx_HIGH (Pmode, offset))));
524 emit_insn (gen_rtx_SET (Pmode, reg,
525 gen_rtx_LO_SUM (Pmode, hi_sum_reg,
526 copy_rtx (offset))));
530 #if defined (HAVE_lo_sum)
533 emit_insn (gen_rtx_SET (VOIDmode, reg,
534 gen_rtx_HIGH (Pmode, offset)));
535 emit_insn (gen_rtx_SET (VOIDmode, reg,
536 gen_rtx_LO_SUM (Pmode, reg,
537 copy_rtx (offset))));
538 emit_use (pic_offset_table_rtx);
540 orig = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, reg);
546 ptr_ref = (gen_rtx_SYMBOL_REF
548 machopic_indirection_name (orig, /*stub_p=*/false)));
550 SYMBOL_REF_DATA (ptr_ref) = SYMBOL_REF_DATA (orig);
552 ptr_ref = gen_const_mem (Pmode, ptr_ref);
553 machopic_define_symbol (ptr_ref);
557 else if (GET_CODE (orig) == CONST)
561 /* legitimize both operands of the PLUS */
562 if (GET_CODE (XEXP (orig, 0)) == PLUS)
564 base = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 0),
566 orig = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 1),
567 (base == reg ? 0 : reg));
572 if (MACHOPIC_PURE && GET_CODE (orig) == CONST_INT)
573 result = plus_constant (base, INTVAL (orig));
575 result = gen_rtx_PLUS (Pmode, base, orig);
577 if (MACHOPIC_JUST_INDIRECT && GET_CODE (base) == MEM)
581 emit_move_insn (reg, result);
586 result = force_reg (GET_MODE (result), result);
593 else if (GET_CODE (orig) == MEM)
594 XEXP (ptr_ref, 0) = machopic_indirect_data_reference (XEXP (orig, 0), reg);
595 /* When the target is i386, this code prevents crashes due to the
596 compiler's ignorance on how to move the PIC base register to
597 other registers. (The reload phase sometimes introduces such
599 else if (GET_CODE (orig) == PLUS
600 && GET_CODE (XEXP (orig, 0)) == REG
601 && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM
603 /* Prevent the same register from being erroneously used
604 as both the base and index registers. */
605 && GET_CODE (XEXP (orig, 1)) == CONST
609 emit_move_insn (reg, XEXP (orig, 0));
610 XEXP (ptr_ref, 0) = reg;
615 /* Transform TARGET (a MEM), which is a function call target, to the
616 corresponding symbol_stub if necessary. Return a new MEM. */
619 machopic_indirect_call_target (rtx target)
621 if (GET_CODE (target) != MEM)
624 if (MACHOPIC_INDIRECT
625 && GET_CODE (XEXP (target, 0)) == SYMBOL_REF
626 && !(SYMBOL_REF_FLAGS (XEXP (target, 0))
627 & MACHO_SYMBOL_FLAG_DEFINED))
629 rtx sym_ref = XEXP (target, 0);
630 const char *stub_name = machopic_indirection_name (sym_ref,
632 enum machine_mode mode = GET_MODE (sym_ref);
634 XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name);
635 SYMBOL_REF_DATA (XEXP (target, 0)) = SYMBOL_REF_DATA (sym_ref);
636 MEM_READONLY_P (target) = 1;
637 MEM_NOTRAP_P (target) = 1;
644 machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg)
648 if (! MACHOPIC_INDIRECT)
651 /* First handle a simple SYMBOL_REF or LABEL_REF */
652 if (GET_CODE (orig) == LABEL_REF
653 || (GET_CODE (orig) == SYMBOL_REF
656 /* addr(foo) = &func+(foo-func) */
657 orig = machopic_indirect_data_reference (orig, reg);
659 if (GET_CODE (orig) == PLUS
660 && GET_CODE (XEXP (orig, 0)) == REG)
663 return force_reg (mode, orig);
665 emit_move_insn (reg, orig);
669 if (GET_CODE (orig) == MEM)
673 gcc_assert (!reload_in_progress);
674 reg = gen_reg_rtx (Pmode);
678 if (MACHO_DYNAMIC_NO_PIC_P
679 && (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
680 || GET_CODE (XEXP (orig, 0)) == LABEL_REF))
682 #if defined (TARGET_TOC) /* ppc */
683 rtx temp_reg = (!can_create_pseudo_p ()
685 gen_reg_rtx (Pmode));
686 rtx asym = XEXP (orig, 0);
689 emit_insn (gen_macho_high (temp_reg, asym));
690 mem = gen_const_mem (GET_MODE (orig),
691 gen_rtx_LO_SUM (Pmode, temp_reg,
693 emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
695 /* Some other CPU -- WriteMe! but right now there are no other
696 platforms that can use dynamic-no-pic */
702 if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
703 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
705 rtx offset = machopic_gen_offset (XEXP (orig, 0));
706 #if defined (TARGET_TOC) /* i.e., PowerPC */
707 /* Generating a new reg may expose opportunities for
708 common subexpression elimination. */
709 rtx hi_sum_reg = (!can_create_pseudo_p ()
711 : gen_reg_rtx (Pmode));
716 sum = gen_rtx_HIGH (Pmode, offset);
717 if (! MACHO_DYNAMIC_NO_PIC_P)
718 sum = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, sum);
720 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, sum));
722 mem = gen_const_mem (GET_MODE (orig),
723 gen_rtx_LO_SUM (Pmode,
726 insn = emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
727 set_unique_reg_note (insn, REG_EQUAL, pic_ref);
731 emit_use (gen_rtx_REG (Pmode, PIC_OFFSET_TABLE_REGNUM));
733 emit_insn (gen_rtx_SET (VOIDmode, reg,
735 gen_rtx_CONST (Pmode,
737 emit_insn (gen_rtx_SET (VOIDmode, reg,
738 gen_rtx_LO_SUM (Pmode, reg,
739 gen_rtx_CONST (Pmode,
740 copy_rtx (offset)))));
741 pic_ref = gen_rtx_PLUS (Pmode,
742 pic_offset_table_rtx, reg);
746 #endif /* HAVE_lo_sum */
748 rtx pic = pic_offset_table_rtx;
749 if (GET_CODE (pic) != REG)
751 emit_move_insn (reg, pic);
755 emit_use (gen_rtx_REG (Pmode, PIC_OFFSET_TABLE_REGNUM));
758 if (reload_in_progress)
759 df_set_regs_ever_live (REGNO (pic), true);
760 pic_ref = gen_rtx_PLUS (Pmode, pic,
761 machopic_gen_offset (XEXP (orig, 0)));
764 #if !defined (TARGET_TOC)
765 emit_move_insn (reg, pic_ref);
766 pic_ref = gen_const_mem (GET_MODE (orig), reg);
773 if (GET_CODE (orig) == SYMBOL_REF
774 || GET_CODE (orig) == LABEL_REF)
776 rtx offset = machopic_gen_offset (orig);
777 #if defined (TARGET_TOC) /* i.e., PowerPC */
782 gcc_assert (!reload_in_progress);
783 reg = gen_reg_rtx (Pmode);
788 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
789 (MACHO_DYNAMIC_NO_PIC_P)
790 ? gen_rtx_HIGH (Pmode, offset)
791 : gen_rtx_PLUS (Pmode,
792 pic_offset_table_rtx,
795 emit_insn (gen_rtx_SET (VOIDmode, reg,
796 gen_rtx_LO_SUM (Pmode,
798 copy_rtx (offset))));
801 emit_insn (gen_rtx_SET (VOIDmode, reg,
802 gen_rtx_HIGH (Pmode, offset)));
803 emit_insn (gen_rtx_SET (VOIDmode, reg,
804 gen_rtx_LO_SUM (Pmode, reg,
805 copy_rtx (offset))));
806 pic_ref = gen_rtx_PLUS (Pmode,
807 pic_offset_table_rtx, reg);
811 #endif /* HAVE_lo_sum */
814 || GET_CODE (orig) == SUBREG)
820 rtx pic = pic_offset_table_rtx;
821 if (GET_CODE (pic) != REG)
823 emit_move_insn (reg, pic);
827 emit_use (pic_offset_table_rtx);
829 if (reload_in_progress)
830 df_set_regs_ever_live (REGNO (pic), true);
831 pic_ref = gen_rtx_PLUS (Pmode,
833 machopic_gen_offset (orig));
838 if (GET_CODE (pic_ref) != REG)
842 emit_move_insn (reg, pic_ref);
847 return force_reg (mode, pic_ref);
856 else if (GET_CODE (orig) == SYMBOL_REF)
859 else if (GET_CODE (orig) == PLUS
860 && (GET_CODE (XEXP (orig, 0)) == MEM
861 || GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
862 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
863 && XEXP (orig, 0) != pic_offset_table_rtx
864 && GET_CODE (XEXP (orig, 1)) != REG)
868 int is_complex = (GET_CODE (XEXP (orig, 0)) == MEM);
870 base = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
871 orig = machopic_legitimize_pic_address (XEXP (orig, 1),
872 Pmode, (base == reg ? 0 : reg));
873 if (GET_CODE (orig) == CONST_INT)
875 pic_ref = plus_constant (base, INTVAL (orig));
879 pic_ref = gen_rtx_PLUS (Pmode, base, orig);
881 if (reg && is_complex)
883 emit_move_insn (reg, pic_ref);
886 /* Likewise, should we set special REG_NOTEs here? */
889 else if (GET_CODE (orig) == CONST)
891 return machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
894 else if (GET_CODE (orig) == MEM
895 && GET_CODE (XEXP (orig, 0)) == SYMBOL_REF)
897 rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
898 addr = replace_equiv_address (orig, addr);
899 emit_move_insn (reg, addr);
906 /* Output the stub or non-lazy pointer in *SLOT, if it has been used.
907 DATA is the FILE* for assembly output. Called from
911 machopic_output_indirection (void **slot, void *data)
913 machopic_indirection *p = *((machopic_indirection **) slot);
914 FILE *asm_out_file = (FILE *) data;
916 const char *sym_name;
917 const char *ptr_name;
923 sym_name = XSTR (symbol, 0);
924 ptr_name = p->ptr_name;
932 id = maybe_get_identifier (sym_name);
937 while (IDENTIFIER_TRANSPARENT_ALIAS (id))
938 id = TREE_CHAIN (id);
940 sym_name = IDENTIFIER_POINTER (id);
943 sym = XALLOCAVEC (char, strlen (sym_name) + 2);
944 if (sym_name[0] == '*' || sym_name[0] == '&')
945 strcpy (sym, sym_name + 1);
946 else if (sym_name[0] == '-' || sym_name[0] == '+')
947 strcpy (sym, sym_name);
949 sprintf (sym, "%s%s", user_label_prefix, sym_name);
951 stub = XALLOCAVEC (char, strlen (ptr_name) + 2);
952 if (ptr_name[0] == '*' || ptr_name[0] == '&')
953 strcpy (stub, ptr_name + 1);
955 sprintf (stub, "%s%s", user_label_prefix, ptr_name);
957 machopic_output_stub (asm_out_file, sym, stub);
959 else if (! indirect_data (symbol)
960 && (machopic_symbol_defined_p (symbol)
961 || SYMBOL_REF_LOCAL_P (symbol)))
963 switch_to_section (data_section);
964 assemble_align (GET_MODE_ALIGNMENT (Pmode));
965 assemble_label (ptr_name);
966 assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name),
967 GET_MODE_SIZE (Pmode),
968 GET_MODE_ALIGNMENT (Pmode), 1);
972 rtx init = const0_rtx;
974 switch_to_section (darwin_sections[machopic_nl_symbol_ptr_section]);
976 /* Mach-O symbols are passed around in code through indirect
977 references and the original symbol_ref hasn't passed through
978 the generic handling and reference-catching in
979 output_operand, so we need to manually mark weak references
981 if (SYMBOL_REF_WEAK (symbol))
983 tree decl = SYMBOL_REF_DECL (symbol);
984 gcc_assert (DECL_P (decl));
986 if (decl != NULL_TREE
987 && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl)
988 /* Handle only actual external-only definitions, not
989 e.g. extern inline code or variables for which
990 storage has been allocated. */
991 && !TREE_STATIC (decl))
993 fputs ("\t.weak_reference ", asm_out_file);
994 assemble_name (asm_out_file, sym_name);
995 fputc ('\n', asm_out_file);
999 assemble_name (asm_out_file, ptr_name);
1000 fprintf (asm_out_file, ":\n");
1002 fprintf (asm_out_file, "\t.indirect_symbol ");
1003 assemble_name (asm_out_file, sym_name);
1004 fprintf (asm_out_file, "\n");
1006 /* Variables that are marked with MACHO_SYMBOL_STATIC need to
1007 have their symbol name instead of 0 in the second entry of
1008 the non-lazy symbol pointer data structure when they are
1009 defined. This allows the runtime to rebind newer instances
1010 of the translation unit with the original instance of the
1013 if ((SYMBOL_REF_FLAGS (symbol) & MACHO_SYMBOL_STATIC)
1014 && machopic_symbol_defined_p (symbol))
1015 init = gen_rtx_SYMBOL_REF (Pmode, sym_name);
1017 assemble_integer (init, GET_MODE_SIZE (Pmode),
1018 GET_MODE_ALIGNMENT (Pmode), 1);
1025 machopic_finish (FILE *asm_out_file)
1027 if (machopic_indirections)
1028 htab_traverse_noresize (machopic_indirections,
1029 machopic_output_indirection,
1034 machopic_operand_p (rtx op)
1036 if (MACHOPIC_JUST_INDIRECT)
1037 return (GET_CODE (op) == SYMBOL_REF
1038 && machopic_symbol_defined_p (op));
1040 return (GET_CODE (op) == CONST
1041 && GET_CODE (XEXP (op, 0)) == UNSPEC
1042 && XINT (XEXP (op, 0), 1) == UNSPEC_MACHOPIC_OFFSET);
1045 /* This function records whether a given name corresponds to a defined
1046 or undefined function or variable, for machopic_classify_ident to
1050 darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
1054 /* Do the standard encoding things first. */
1055 default_encode_section_info (decl, rtl, first);
1057 if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
1060 sym_ref = XEXP (rtl, 0);
1061 if (TREE_CODE (decl) == VAR_DECL)
1062 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE;
1064 if (!DECL_EXTERNAL (decl)
1065 && (!TREE_PUBLIC (decl) || !DECL_WEAK (decl))
1066 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (decl))
1067 && ((TREE_STATIC (decl)
1068 && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl)))
1069 || (!DECL_COMMON (decl) && DECL_INITIAL (decl)
1070 && DECL_INITIAL (decl) != error_mark_node)))
1071 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
1073 if (! TREE_PUBLIC (decl))
1074 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_STATIC;
1078 darwin_mark_decl_preserved (const char *name)
1080 fprintf (asm_out_file, ".no_dead_strip ");
1081 assemble_name (asm_out_file, name);
1082 fputc ('\n', asm_out_file);
1086 darwin_text_section (int reloc, int weak)
1090 ? darwin_sections[text_unlikely_coal_section]
1091 : unlikely_text_section ());
1094 ? darwin_sections[text_coal_section]
1099 darwin_rodata_section (int weak)
1102 ? darwin_sections[const_coal_section]
1103 : darwin_sections[const_section]);
1107 darwin_mergeable_string_section (tree exp,
1108 unsigned HOST_WIDE_INT align)
1110 if (flag_merge_constants
1111 && TREE_CODE (exp) == STRING_CST
1112 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE
1114 && (int_size_in_bytes (TREE_TYPE (exp))
1115 == TREE_STRING_LENGTH (exp))
1116 && ((size_t) TREE_STRING_LENGTH (exp)
1117 == strlen (TREE_STRING_POINTER (exp)) + 1))
1118 return darwin_sections[cstring_section];
1120 return readonly_data_section;
1123 #ifndef HAVE_GAS_LITERAL16
1124 #define HAVE_GAS_LITERAL16 0
1128 darwin_mergeable_constant_section (tree exp,
1129 unsigned HOST_WIDE_INT align)
1131 enum machine_mode mode = DECL_MODE (exp);
1132 unsigned int modesize = GET_MODE_BITSIZE (mode);
1134 if (flag_merge_constants
1137 && modesize <= align
1140 && (align & (align -1)) == 0)
1142 tree size = TYPE_SIZE_UNIT (TREE_TYPE (exp));
1144 if (TREE_CODE (size) == INTEGER_CST
1145 && TREE_INT_CST_LOW (size) == 4
1146 && TREE_INT_CST_HIGH (size) == 0)
1147 return darwin_sections[literal4_section];
1148 else if (TREE_CODE (size) == INTEGER_CST
1149 && TREE_INT_CST_LOW (size) == 8
1150 && TREE_INT_CST_HIGH (size) == 0)
1151 return darwin_sections[literal8_section];
1152 else if (HAVE_GAS_LITERAL16
1154 && TREE_CODE (size) == INTEGER_CST
1155 && TREE_INT_CST_LOW (size) == 16
1156 && TREE_INT_CST_HIGH (size) == 0)
1157 return darwin_sections[literal16_section];
1159 return readonly_data_section;
1162 return readonly_data_section;
1166 machopic_reloc_rw_mask (void)
1168 return MACHOPIC_INDIRECT ? 3 : 0;
1172 machopic_select_section (tree decl,
1174 unsigned HOST_WIDE_INT align)
1176 bool weak = (DECL_P (decl)
1178 && !lookup_attribute ("weak_import",
1179 DECL_ATTRIBUTES (decl)));
1180 section *base_section;
1182 switch (categorize_decl_for_section (decl, reloc))
1185 base_section = darwin_text_section (reloc, weak);
1189 case SECCAT_SRODATA:
1190 base_section = darwin_rodata_section (weak);
1193 case SECCAT_RODATA_MERGE_STR:
1194 base_section = darwin_mergeable_string_section (decl, align);
1197 case SECCAT_RODATA_MERGE_STR_INIT:
1198 base_section = darwin_mergeable_string_section (DECL_INITIAL (decl), align);
1201 case SECCAT_RODATA_MERGE_CONST:
1202 base_section = darwin_mergeable_constant_section (decl, align);
1206 case SECCAT_DATA_REL:
1207 case SECCAT_DATA_REL_LOCAL:
1208 case SECCAT_DATA_REL_RO:
1209 case SECCAT_DATA_REL_RO_LOCAL:
1215 if (TREE_READONLY (decl) || TREE_CONSTANT (decl))
1216 base_section = weak ? darwin_sections[const_data_coal_section]
1217 : darwin_sections[const_data_section];
1219 base_section = weak ? darwin_sections[data_coal_section] : data_section;
1226 /* Darwin weird special cases. */
1227 if (TREE_CODE (decl) == CONSTRUCTOR
1229 && TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
1230 && TYPE_NAME (TREE_TYPE (decl)))
1232 tree name = TYPE_NAME (TREE_TYPE (decl));
1233 if (TREE_CODE (name) == TYPE_DECL)
1234 name = DECL_NAME (name);
1236 if (!strcmp (IDENTIFIER_POINTER (name), "__builtin_ObjCString"))
1238 if (flag_next_runtime)
1239 return darwin_sections[objc_constant_string_object_section];
1241 return darwin_sections[objc_string_object_section];
1244 return base_section;
1246 else if (TREE_CODE (decl) == VAR_DECL
1248 && TREE_CODE (DECL_NAME (decl)) == IDENTIFIER_NODE
1249 && IDENTIFIER_POINTER (DECL_NAME (decl))
1250 && !strncmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "_OBJC_", 6))
1252 const char *name = IDENTIFIER_POINTER (DECL_NAME (decl));
1254 if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20))
1255 return darwin_sections[objc_cls_meth_section];
1256 else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23))
1257 return darwin_sections[objc_inst_meth_section];
1258 else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 20))
1259 return darwin_sections[objc_cat_cls_meth_section];
1260 else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 23))
1261 return darwin_sections[objc_cat_inst_meth_section];
1262 else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22))
1263 return darwin_sections[objc_class_vars_section];
1264 else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25))
1265 return darwin_sections[objc_instance_vars_section];
1266 else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22))
1267 return darwin_sections[objc_cat_cls_meth_section];
1268 else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17))
1269 return darwin_sections[objc_class_names_section];
1270 else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20))
1271 return darwin_sections[objc_meth_var_names_section];
1272 else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20))
1273 return darwin_sections[objc_meth_var_types_section];
1274 else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22))
1275 return darwin_sections[objc_cls_refs_section];
1276 else if (!strncmp (name, "_OBJC_CLASS_", 12))
1277 return darwin_sections[objc_class_section];
1278 else if (!strncmp (name, "_OBJC_METACLASS_", 16))
1279 return darwin_sections[objc_meta_class_section];
1280 else if (!strncmp (name, "_OBJC_CATEGORY_", 15))
1281 return darwin_sections[objc_category_section];
1282 else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25))
1283 return darwin_sections[objc_selector_refs_section];
1284 else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20))
1285 return darwin_sections[objc_selector_fixup_section];
1286 else if (!strncmp (name, "_OBJC_SYMBOLS", 13))
1287 return darwin_sections[objc_symbols_section];
1288 else if (!strncmp (name, "_OBJC_MODULES", 13))
1289 return darwin_sections[objc_module_info_section];
1290 else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16))
1291 return darwin_sections[objc_image_info_section];
1292 else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32))
1293 return darwin_sections[objc_cat_inst_meth_section];
1294 else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29))
1295 return darwin_sections[objc_cat_cls_meth_section];
1296 else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20))
1297 return darwin_sections[objc_cat_cls_meth_section];
1298 else if (!strncmp (name, "_OBJC_PROTOCOL_", 15))
1299 return darwin_sections[objc_protocol_section];
1301 return base_section;
1304 return base_section;
1307 /* This can be called with address expressions as "rtx".
1308 They must go in "const". */
1311 machopic_select_rtx_section (enum machine_mode mode, rtx x,
1312 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
1314 if (GET_MODE_SIZE (mode) == 8
1315 && (GET_CODE (x) == CONST_INT
1316 || GET_CODE (x) == CONST_DOUBLE))
1317 return darwin_sections[literal8_section];
1318 else if (GET_MODE_SIZE (mode) == 4
1319 && (GET_CODE (x) == CONST_INT
1320 || GET_CODE (x) == CONST_DOUBLE))
1321 return darwin_sections[literal4_section];
1322 else if (HAVE_GAS_LITERAL16
1324 && GET_MODE_SIZE (mode) == 16
1325 && (GET_CODE (x) == CONST_INT
1326 || GET_CODE (x) == CONST_DOUBLE
1327 || GET_CODE (x) == CONST_VECTOR))
1328 return darwin_sections[literal16_section];
1329 else if (MACHOPIC_INDIRECT
1330 && (GET_CODE (x) == SYMBOL_REF
1331 || GET_CODE (x) == CONST
1332 || GET_CODE (x) == LABEL_REF))
1333 return darwin_sections[const_data_section];
1335 return darwin_sections[const_section];
1339 machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1341 if (MACHOPIC_INDIRECT)
1342 switch_to_section (darwin_sections[mod_init_section]);
1344 switch_to_section (darwin_sections[constructor_section]);
1345 assemble_align (POINTER_SIZE);
1346 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1348 if (! MACHOPIC_INDIRECT)
1349 fprintf (asm_out_file, ".reference .constructors_used\n");
1353 machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1355 if (MACHOPIC_INDIRECT)
1356 switch_to_section (darwin_sections[mod_term_section]);
1358 switch_to_section (darwin_sections[destructor_section]);
1359 assemble_align (POINTER_SIZE);
1360 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1362 if (! MACHOPIC_INDIRECT)
1363 fprintf (asm_out_file, ".reference .destructors_used\n");
1367 darwin_globalize_label (FILE *stream, const char *name)
1369 if (!!strncmp (name, "_OBJC_", 6))
1370 default_globalize_label (stream, name);
1373 /* This routine returns non-zero if 'name' starts with the special objective-c
1374 anonymous file-scope static name. It accommodates c++'s mangling of such
1375 symbols (in this case the symbols will have form _ZL{d}*_OBJC_* d=digit). */
1378 darwin_label_is_anonymous_local_objc_name (const char *name)
1380 const unsigned char *p = (const unsigned char *) name;
1383 if (p[1] == 'Z' && p[2] == 'L')
1386 while (*p >= '0' && *p <= '9')
1389 return (!strncmp ((const char *)p, "_OBJC_", 6));
1392 /* LTO support for Mach-O. */
1394 /* Section names for LTO sections. */
1395 static unsigned int lto_section_names_offset = 0;
1397 /* This is the obstack which we use to allocate the many strings. */
1398 static struct obstack lto_section_names_obstack;
1400 /* Segment name for LTO sections. */
1401 #define LTO_SEGMENT_NAME "__GNU_LTO"
1403 /* Section name for LTO section names section. */
1404 #define LTO_NAMES_SECTION "__section_names"
1406 /* File to temporarily store LTO data. This is appended to asm_out_file
1407 in darwin_end_file. */
1408 static FILE *lto_asm_out_file, *saved_asm_out_file;
1409 static char *lto_asm_out_name;
1411 /* Prepare asm_out_file for LTO output. For darwin, this means hiding
1412 asm_out_file and switching to an alternative output file. */
1414 darwin_asm_lto_start (void)
1416 gcc_assert (! saved_asm_out_file);
1417 saved_asm_out_file = asm_out_file;
1418 if (! lto_asm_out_name)
1419 lto_asm_out_name = make_temp_file (".lto.s");
1420 lto_asm_out_file = fopen (lto_asm_out_name, "a");
1421 if (lto_asm_out_file == NULL)
1422 fatal_error ("failed to open temporary file %s for LTO output",
1424 asm_out_file = lto_asm_out_file;
1427 /* Restore asm_out_file. */
1429 darwin_asm_lto_end (void)
1431 gcc_assert (saved_asm_out_file);
1432 fclose (lto_asm_out_file);
1433 asm_out_file = saved_asm_out_file;
1434 saved_asm_out_file = NULL;
1438 darwin_asm_named_section (const char *name,
1440 tree decl ATTRIBUTE_UNUSED)
1442 /* LTO sections go in a special segment __GNU_LTO. We want to replace the
1443 section name with something we can use to represent arbitrary-length
1444 names (section names in Mach-O are at most 16 characters long). */
1445 if (strncmp (name, LTO_SECTION_NAME_PREFIX,
1446 strlen (LTO_SECTION_NAME_PREFIX)) == 0)
1448 /* We expect certain flags to be set... */
1449 gcc_assert ((flags & (SECTION_DEBUG | SECTION_NAMED))
1450 == (SECTION_DEBUG | SECTION_NAMED));
1452 /* Add the section name to the things to output when we end the
1453 current assembler output file.
1454 This is all not very efficient, but that doesn't matter -- this
1455 shouldn't be a hot path in the compiler... */
1456 obstack_1grow (<o_section_names_obstack, '\t');
1457 obstack_grow (<o_section_names_obstack, ".ascii ", 7);
1458 obstack_1grow (<o_section_names_obstack, '"');
1459 obstack_grow (<o_section_names_obstack, name, strlen (name));
1460 obstack_grow (<o_section_names_obstack, "\\0\"\n", 4);
1462 /* Output the dummy section name. */
1463 fprintf (asm_out_file, "\t.section %s,__%08X,regular,debug\t# %s\n",
1464 LTO_SEGMENT_NAME, lto_section_names_offset, name);
1466 /* Update the offset for the next section name. Make sure we stay
1467 within reasonable length. */
1468 lto_section_names_offset += strlen (name) + 1;
1469 gcc_assert (lto_section_names_offset > 0
1470 && lto_section_names_offset < ((unsigned) 1 << 31));
1473 fprintf (asm_out_file, "\t.section %s\n", name);
1477 darwin_unique_section (tree decl ATTRIBUTE_UNUSED, int reloc ATTRIBUTE_UNUSED)
1479 /* Darwin does not use unique sections. */
1482 /* Handle __attribute__ ((apple_kext_compatibility)).
1483 This only applies to darwin kexts for 2.95 compatibility -- it shrinks the
1484 vtable for classes with this attribute (and their descendants) by not
1485 outputting the new 3.0 nondeleting destructor. This means that such
1486 objects CANNOT be allocated on the stack or as globals UNLESS they have
1487 a completely empty `operator delete'.
1488 Luckily, this fits in with the Darwin kext model.
1490 This attribute also disables gcc3's potential overlaying of derived
1491 class data members on the padding at the end of the base class. */
1494 darwin_handle_kext_attribute (tree *node, tree name,
1495 tree args ATTRIBUTE_UNUSED,
1496 int flags ATTRIBUTE_UNUSED,
1499 /* APPLE KEXT stuff -- only applies with pure static C++ code. */
1500 if (! TARGET_KEXTABI)
1502 warning (0, "%qE 2.95 vtable-compatibility attribute applies "
1503 "only when compiling a kext", name);
1505 *no_add_attrs = true;
1507 else if (TREE_CODE (*node) != RECORD_TYPE)
1509 warning (0, "%qE 2.95 vtable-compatibility attribute applies "
1510 "only to C++ classes", name);
1512 *no_add_attrs = true;
1518 /* Handle a "weak_import" attribute; arguments as in
1519 struct attribute_spec.handler. */
1522 darwin_handle_weak_import_attribute (tree *node, tree name,
1523 tree ARG_UNUSED (args),
1524 int ARG_UNUSED (flags),
1525 bool * no_add_attrs)
1527 if (TREE_CODE (*node) != FUNCTION_DECL && TREE_CODE (*node) != VAR_DECL)
1529 warning (OPT_Wattributes, "%qE attribute ignored",
1531 *no_add_attrs = true;
1534 declare_weak (*node);
1539 /* Emit a label for an FDE, making it global and/or weak if appropriate.
1540 The third parameter is nonzero if this is for exception handling.
1541 The fourth parameter is nonzero if this is just a placeholder for an
1542 FDE that we are omitting. */
1545 darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty)
1552 lab = concat (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)), ".eh", NULL);
1554 if (TREE_PUBLIC (decl))
1556 targetm.asm_out.globalize_label (file, lab);
1557 if (DECL_VISIBILITY (decl) == VISIBILITY_HIDDEN)
1559 fputs ("\t.private_extern ", file);
1560 assemble_name (file, lab);
1565 if (DECL_WEAK (decl))
1567 fputs ("\t.weak_definition ", file);
1568 assemble_name (file, lab);
1572 assemble_name (file, lab);
1575 fputs (" = 0\n", file);
1577 /* Mark the absolute .eh and .eh1 style labels as needed to
1578 ensure that we don't dead code strip them and keep such
1579 labels from another instantiation point until we can fix this
1580 properly with group comdat support. */
1581 darwin_mark_decl_preserved (lab);
1584 fputs (":\n", file);
1589 static GTY(()) unsigned long except_table_label_num;
1592 darwin_emit_except_table_label (FILE *file)
1594 char section_start_label[30];
1596 ASM_GENERATE_INTERNAL_LABEL (section_start_label, "GCC_except_table",
1597 except_table_label_num++);
1598 ASM_OUTPUT_LABEL (file, section_start_label);
1600 /* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */
1603 darwin_non_lazy_pcrel (FILE *file, rtx addr)
1605 const char *nlp_name;
1607 gcc_assert (GET_CODE (addr) == SYMBOL_REF);
1609 nlp_name = machopic_indirection_name (addr, /*stub_p=*/false);
1610 fputs ("\t.long\t", file);
1611 ASM_OUTPUT_LABELREF (file, nlp_name);
1615 /* Emit an assembler directive to set visibility for a symbol. The
1616 only supported visibilities are VISIBILITY_DEFAULT and
1617 VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private
1618 extern". There is no MACH-O equivalent of ELF's
1619 VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */
1622 darwin_assemble_visibility (tree decl, int vis)
1624 if (vis == VISIBILITY_DEFAULT)
1626 else if (vis == VISIBILITY_HIDDEN)
1628 fputs ("\t.private_extern ", asm_out_file);
1629 assemble_name (asm_out_file,
1630 (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))));
1631 fputs ("\n", asm_out_file);
1634 warning (OPT_Wattributes, "internal and protected visibility attributes "
1635 "not supported in this configuration; ignored");
1638 /* Output a difference of two labels that will be an assembly time
1639 constant if the two labels are local. (.long lab1-lab2 will be
1640 very different if lab1 is at the boundary between two sections; it
1641 will be relocated according to the second section, not the first,
1642 so one ends up with a difference between labels in different
1643 sections, which is bad in the dwarf2 eh context for instance.) */
1645 static int darwin_dwarf_label_counter;
1648 darwin_asm_output_dwarf_delta (FILE *file, int size,
1649 const char *lab1, const char *lab2)
1651 int islocaldiff = (lab1[0] == '*' && lab1[1] == 'L'
1652 && lab2[0] == '*' && lab2[1] == 'L');
1653 const char *directive = (size == 8 ? ".quad" : ".long");
1656 fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter);
1658 fprintf (file, "\t%s\t", directive);
1659 assemble_name_raw (file, lab1);
1660 fprintf (file, "-");
1661 assemble_name_raw (file, lab2);
1663 fprintf (file, "\n\t%s L$set$%d", directive, darwin_dwarf_label_counter++);
1666 /* Output labels for the start of the DWARF sections if necessary.
1667 Initialize the stuff we need for LTO long section names support. */
1669 darwin_file_start (void)
1671 if (write_symbols == DWARF2_DEBUG)
1673 static const char * const debugnames[] =
1675 DEBUG_FRAME_SECTION,
1677 DEBUG_ABBREV_SECTION,
1678 DEBUG_ARANGES_SECTION,
1679 DEBUG_MACINFO_SECTION,
1682 DEBUG_PUBNAMES_SECTION,
1683 DEBUG_PUBTYPES_SECTION,
1685 DEBUG_RANGES_SECTION
1689 for (i = 0; i < ARRAY_SIZE (debugnames); i++)
1693 switch_to_section (get_section (debugnames[i], SECTION_DEBUG, NULL));
1695 gcc_assert (strncmp (debugnames[i], "__DWARF,", 8) == 0);
1696 gcc_assert (strchr (debugnames[i] + 8, ','));
1698 namelen = strchr (debugnames[i] + 8, ',') - (debugnames[i] + 8);
1699 fprintf (asm_out_file, "Lsection%.*s:\n", namelen, debugnames[i] + 8);
1703 /* We fill this obstack with the complete section text for the lto section
1704 names to write in darwin_file_end. */
1705 obstack_init (<o_section_names_obstack);
1706 lto_section_names_offset = 0;
1709 /* Output an offset in a DWARF section on Darwin. On Darwin, DWARF section
1710 offsets are not represented using relocs in .o files; either the
1711 section never leaves the .o file, or the linker or other tool is
1712 responsible for parsing the DWARF and updating the offsets. */
1715 darwin_asm_output_dwarf_offset (FILE *file, int size, const char * lab,
1721 gcc_assert (base->common.flags & SECTION_NAMED);
1722 gcc_assert (strncmp (base->named.name, "__DWARF,", 8) == 0);
1723 gcc_assert (strchr (base->named.name + 8, ','));
1725 namelen = strchr (base->named.name + 8, ',') - (base->named.name + 8);
1726 sprintf (sname, "*Lsection%.*s", namelen, base->named.name + 8);
1727 darwin_asm_output_dwarf_delta (file, size, lab, sname);
1731 darwin_file_end (void)
1733 const char *lto_section_names;
1735 machopic_finish (asm_out_file);
1736 if (strcmp (lang_hooks.name, "GNU C++") == 0)
1738 switch_to_section (darwin_sections[constructor_section]);
1739 switch_to_section (darwin_sections[destructor_section]);
1740 ASM_OUTPUT_ALIGN (asm_out_file, 1);
1743 /* If there was LTO assembler output, append it to asm_out_file. */
1744 if (lto_asm_out_name)
1747 char *buf, *lto_asm_txt;
1749 /* Shouldn't be here if we failed to switch back. */
1750 gcc_assert (! saved_asm_out_file);
1752 lto_asm_out_file = fopen (lto_asm_out_name, "r");
1753 if (lto_asm_out_file == NULL)
1754 fatal_error ("failed to open temporary file %s with LTO output",
1756 fseek (lto_asm_out_file, 0, SEEK_END);
1757 n = ftell (lto_asm_out_file);
1760 fseek (lto_asm_out_file, 0, SEEK_SET);
1761 lto_asm_txt = buf = (char *) xmalloc (n + 1);
1762 while (fgets (lto_asm_txt, n, lto_asm_out_file))
1763 fputs (lto_asm_txt, asm_out_file);
1766 /* Remove the temporary file. */
1767 fclose (lto_asm_out_file);
1768 unlink_if_ordinary (lto_asm_out_name);
1769 free (lto_asm_out_name);
1772 /* Finish the LTO section names obstack. Don't output anything if
1773 there are no recorded section names. */
1774 obstack_1grow (<o_section_names_obstack, '\0');
1775 lto_section_names = XOBFINISH (<o_section_names_obstack, const char *);
1776 if (strlen (lto_section_names) > 0)
1778 fprintf (asm_out_file,
1779 "\t.section %s,%s,regular,debug\n",
1780 LTO_SEGMENT_NAME, LTO_NAMES_SECTION);
1781 fprintf (asm_out_file,
1782 "\t# Section names in %s are offsets into this table\n",
1784 fprintf (asm_out_file, "%s\n", lto_section_names);
1786 obstack_free (<o_section_names_obstack, NULL);
1788 fprintf (asm_out_file, "\t.subsections_via_symbols\n");
1791 /* TODO: Add a language hook for identifying if a decl is a vtable. */
1792 #define DARWIN_VTABLE_P(DECL) 0
1794 /* Cross-module name binding. Darwin does not support overriding
1795 functions at dynamic-link time, except for vtables in kexts. */
1798 darwin_binds_local_p (const_tree decl)
1800 return default_binds_local_p_1 (decl,
1801 TARGET_KEXTABI && DARWIN_VTABLE_P (decl));
1805 /* See TARGET_ASM_OUTPUT_ANCHOR for why we can't do this yet. */
1806 /* The Darwin's implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
1807 anchor relative to ".", the current section position. We cannot use
1808 the default one because ASM_OUTPUT_DEF is wrong for Darwin. */
1811 darwin_asm_output_anchor (rtx symbol)
1813 fprintf (asm_out_file, "\t.set\t");
1814 assemble_name (asm_out_file, XSTR (symbol, 0));
1815 fprintf (asm_out_file, ", . + " HOST_WIDE_INT_PRINT_DEC "\n",
1816 SYMBOL_REF_BLOCK_OFFSET (symbol));
1820 /* Set the darwin specific attributes on TYPE. */
1822 darwin_set_default_type_attributes (tree type)
1824 if (darwin_ms_struct
1825 && TREE_CODE (type) == RECORD_TYPE)
1826 TYPE_ATTRIBUTES (type) = tree_cons (get_identifier ("ms_struct"),
1828 TYPE_ATTRIBUTES (type));
1831 /* True, iff we're generating code for loadable kernel extensions. */
1834 darwin_kextabi_p (void) {
1835 return flag_apple_kext;
1839 darwin_override_options (void)
1841 /* Don't emit DWARF3/4 unless specifically selected. This is a
1842 workaround for tool bugs. */
1843 if (dwarf_strict < 0)
1846 /* Disable -freorder-blocks-and-partition for darwin_emit_unwind_label. */
1847 if (flag_reorder_blocks_and_partition
1848 && (targetm.asm_out.unwind_label == darwin_emit_unwind_label))
1850 inform (input_location,
1851 "-freorder-blocks-and-partition does not work with exceptions "
1852 "on this architecture");
1853 flag_reorder_blocks_and_partition = 0;
1854 flag_reorder_blocks = 1;
1857 if (flag_mkernel || flag_apple_kext)
1859 /* -mkernel implies -fapple-kext for C++ */
1860 if (strcmp (lang_hooks.name, "GNU C++") == 0)
1861 flag_apple_kext = 1;
1865 /* No EH in kexts. */
1866 flag_exceptions = 0;
1867 /* No -fnon-call-exceptions data in kexts. */
1868 flag_non_call_exceptions = 0;
1870 if (flag_var_tracking
1871 && strverscmp (darwin_macosx_version_min, "10.5") >= 0
1872 && debug_info_level >= DINFO_LEVEL_NORMAL
1873 && debug_hooks->var_location != do_nothing_debug_hooks.var_location)
1874 flag_var_tracking_uninit = 1;
1877 /* Add $LDBL128 suffix to long double builtins. */
1880 darwin_patch_builtin (int fncode)
1882 tree fn = built_in_decls[fncode];
1889 sym = DECL_ASSEMBLER_NAME (fn);
1890 newname = ACONCAT (("_", IDENTIFIER_POINTER (sym), "$LDBL128", NULL));
1892 set_user_assembler_name (fn, newname);
1894 fn = implicit_built_in_decls[fncode];
1896 set_user_assembler_name (fn, newname);
1900 darwin_patch_builtins (void)
1902 if (LONG_DOUBLE_TYPE_SIZE != 128)
1905 #define PATCH_BUILTIN(fncode) darwin_patch_builtin (fncode);
1906 #define PATCH_BUILTIN_NO64(fncode) \
1907 if (!TARGET_64BIT) \
1908 darwin_patch_builtin (fncode);
1909 #define PATCH_BUILTIN_VARIADIC(fncode) \
1911 && (strverscmp (darwin_macosx_version_min, "10.3.9") >= 0)) \
1912 darwin_patch_builtin (fncode);
1913 #include "darwin-ppc-ldouble-patch.def"
1914 #undef PATCH_BUILTIN
1915 #undef PATCH_BUILTIN_NO64
1916 #undef PATCH_BUILTIN_VARIADIC
1920 #include "gt-darwin.h"