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,
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 2, 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 COPYING. If not, write to
21 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
22 Boston, MA 02110-1301, USA. */
26 #include "coretypes.h"
30 #include "hard-reg-set.h"
32 #include "insn-config.h"
33 #include "conditions.h"
34 #include "insn-flags.h"
36 #include "insn-attr.h"
43 #include "langhooks.h"
49 /* Darwin supports a feature called fix-and-continue, which is used
50 for rapid turn around debugging. When code is compiled with the
51 -mfix-and-continue flag, two changes are made to the generated code
52 that allow the system to do things that it would normally not be
53 able to do easily. These changes allow gdb to load in
54 recompilation of a translation unit that has been changed into a
55 running program and replace existing functions and methods of that
56 translation unit with versions of those functions and methods
57 from the newly compiled translation unit. The new functions access
58 the existing static symbols from the old translation unit, if the
59 symbol existed in the unit to be replaced, and from the new
60 translation unit, otherwise.
62 The changes are to insert 5 nops at the beginning of all functions
63 and to use indirection to get at static symbols. The 5 nops
64 are required by consumers of the generated code. Currently, gdb
65 uses this to patch in a jump to the overriding function, this
66 allows all uses of the old name to forward to the replacement,
67 including existing function pointers and virtual methods. See
68 rs6000_emit_prologue for the code that handles the nop insertions.
70 The added indirection allows gdb to redirect accesses to static
71 symbols from the newly loaded translation unit to the existing
72 symbol, if any. @code{static} symbols are special and are handled by
73 setting the second word in the .non_lazy_symbol_pointer data
74 structure to symbol. See indirect_data for the code that handles
75 the extra indirection, and machopic_output_indirection and its use
76 of MACHO_SYMBOL_STATIC for the code that handles @code{static}
77 symbol indirection. */
80 section * darwin_sections[NUM_DARWIN_SECTIONS];
82 /* A get_unnamed_section callback used to switch to an ObjC section.
83 DIRECTIVE is as for output_section_asm_op. */
86 output_objc_section_asm_op (const void *directive)
88 static bool been_here = false;
92 static const enum darwin_section_enum tomark[] =
94 /* written, cold -> hot */
95 objc_cat_cls_meth_section,
96 objc_cat_inst_meth_section,
97 objc_string_object_section,
98 objc_constant_string_object_section,
99 objc_selector_refs_section,
100 objc_selector_fixup_section,
101 objc_cls_refs_section,
103 objc_meta_class_section,
104 /* shared, hot -> cold */
105 objc_cls_meth_section,
106 objc_inst_meth_section,
107 objc_protocol_section,
108 objc_class_names_section,
109 objc_meth_var_types_section,
110 objc_meth_var_names_section,
111 objc_category_section,
112 objc_class_vars_section,
113 objc_instance_vars_section,
114 objc_module_info_section,
120 for (i = 0; i < ARRAY_SIZE (tomark); i++)
121 switch_to_section (darwin_sections[tomark[i]]);
123 output_section_asm_op (directive);
126 /* Implement TARGET_ASM_INIT_SECTIONS. */
129 darwin_init_sections (void)
131 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) \
132 darwin_sections[NAME] = \
133 get_unnamed_section (FLAGS, (OBJC \
134 ? output_objc_section_asm_op \
135 : output_section_asm_op), \
137 #include "config/darwin-sections.def"
140 readonly_data_section = darwin_sections[const_section];
141 exception_section = darwin_sections[darwin_exception_section];
142 eh_frame_section = darwin_sections[darwin_eh_frame_section];
146 name_needs_quotes (const char *name)
149 while ((c = *name++) != '\0')
150 if (! ISIDNUM (c) && c != '.' && c != '$')
155 /* Return true if SYM_REF can be used without an indirection. */
157 machopic_symbol_defined_p (rtx sym_ref)
159 if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED)
162 /* If a symbol references local and is not an extern to this
163 file, then the symbol might be able to declared as defined. */
164 if (SYMBOL_REF_LOCAL_P (sym_ref) && ! SYMBOL_REF_EXTERNAL_P (sym_ref))
166 /* If the symbol references a variable and the variable is a
167 common symbol, then this symbol is not defined. */
168 if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_VARIABLE)
170 tree decl = SYMBOL_REF_DECL (sym_ref);
173 if (DECL_COMMON (decl))
181 /* This module assumes that (const (symbol_ref "foo")) is a legal pic
182 reference, which will not be changed. */
184 enum machopic_addr_class
185 machopic_classify_symbol (rtx sym_ref)
190 flags = SYMBOL_REF_FLAGS (sym_ref);
191 function_p = SYMBOL_REF_FUNCTION_P (sym_ref);
192 if (machopic_symbol_defined_p (sym_ref))
194 ? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA);
197 ? MACHOPIC_UNDEFINED_FUNCTION : MACHOPIC_UNDEFINED_DATA);
200 #ifndef TARGET_FIX_AND_CONTINUE
201 #define TARGET_FIX_AND_CONTINUE 0
204 /* Indicate when fix-and-continue style code generation is being used
205 and when a reference to data should be indirected so that it can be
206 rebound in a new translation unit to reference the original instance
207 of that data. Symbol names that are for code generation local to
208 the translation unit are bound to the new translation unit;
209 currently this means symbols that begin with L or _OBJC_;
210 otherwise, we indicate that an indirect reference should be made to
211 permit the runtime to rebind new instances of the translation unit
212 to the original instance of the data. */
215 indirect_data (rtx sym_ref)
220 /* If we aren't generating fix-and-continue code, don't do anything special. */
221 if (TARGET_FIX_AND_CONTINUE == 0)
224 /* Otherwise, all symbol except symbols that begin with L or _OBJC_
225 are indirected. Symbols that begin with L and _OBJC_ are always
226 bound to the current translation unit as they are used for
227 generated local data of the translation unit. */
229 name = XSTR (sym_ref, 0);
231 lprefix = (((name[0] == '*' || name[0] == '&')
232 && (name[1] == 'L' || (name[1] == '"' && name[2] == 'L')))
233 || (strncmp (name, "_OBJC_", 6) == 0));
240 machopic_data_defined_p (rtx sym_ref)
242 if (indirect_data (sym_ref))
245 switch (machopic_classify_symbol (sym_ref))
247 case MACHOPIC_DEFINED_DATA:
248 case MACHOPIC_DEFINED_FUNCTION:
256 machopic_define_symbol (rtx mem)
260 gcc_assert (GET_CODE (mem) == MEM);
261 sym_ref = XEXP (mem, 0);
262 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
265 static GTY(()) char * function_base;
268 machopic_function_base_name (void)
270 /* if dynamic-no-pic is on, we should not get here */
271 gcc_assert (!MACHO_DYNAMIC_NO_PIC_P);
273 if (function_base == NULL)
275 (char *) ggc_alloc_string ("<pic base>", sizeof ("<pic base>"));
277 current_function_uses_pic_offset_table = 1;
279 return function_base;
282 /* Return a SYMBOL_REF for the PIC function base. */
285 machopic_function_base_sym (void)
289 sym_ref = gen_rtx_SYMBOL_REF (Pmode, machopic_function_base_name ());
290 SYMBOL_REF_FLAGS (sym_ref)
291 |= (MACHO_SYMBOL_FLAG_VARIABLE | MACHO_SYMBOL_FLAG_DEFINED);
295 /* Return either ORIG or (const:P (minus:P ORIG PIC_BASE)), depending
296 on whether pic_base is NULL or not. */
298 gen_pic_offset (rtx orig, rtx pic_base)
303 return gen_rtx_CONST (Pmode, gen_rtx_MINUS (Pmode, orig, pic_base));
306 static GTY(()) const char * function_base_func_name;
307 static GTY(()) int current_pic_label_num;
310 machopic_output_function_base_name (FILE *file)
312 const char *current_name;
314 /* If dynamic-no-pic is on, we should not get here. */
315 gcc_assert (!MACHO_DYNAMIC_NO_PIC_P);
317 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
318 if (function_base_func_name != current_name)
320 ++current_pic_label_num;
321 function_base_func_name = current_name;
323 fprintf (file, "\"L%011d$pb\"", current_pic_label_num);
326 /* The suffix attached to non-lazy pointer symbols. */
327 #define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr"
328 /* The suffix attached to stub symbols. */
329 #define STUB_SUFFIX "$stub"
331 typedef struct machopic_indirection GTY (())
333 /* The SYMBOL_REF for the entity referenced. */
335 /* The name of the stub or non-lazy pointer. */
336 const char * ptr_name;
337 /* True iff this entry is for a stub (as opposed to a non-lazy
340 /* True iff this stub or pointer pointer has been referenced. */
342 } machopic_indirection;
344 /* A table mapping stub names and non-lazy pointer names to
345 SYMBOL_REFs for the stubbed-to and pointed-to entities. */
347 static GTY ((param_is (struct machopic_indirection))) htab_t
348 machopic_indirections;
350 /* Return a hash value for a SLOT in the indirections hash table. */
353 machopic_indirection_hash (const void *slot)
355 const machopic_indirection *p = (const machopic_indirection *) slot;
356 return htab_hash_string (p->ptr_name);
359 /* Returns true if the KEY is the same as that associated with
363 machopic_indirection_eq (const void *slot, const void *key)
365 return strcmp (((const machopic_indirection *) slot)->ptr_name, key) == 0;
368 /* Return the name of the non-lazy pointer (if STUB_P is false) or
369 stub (if STUB_B is true) corresponding to the given name. */
372 machopic_indirection_name (rtx sym_ref, bool stub_p)
375 const char *name = XSTR (sym_ref, 0);
376 size_t namelen = strlen (name);
377 machopic_indirection *p;
379 bool saw_star = false;
382 const char *prefix = user_label_prefix;
383 const char *quote = "";
386 id = maybe_get_identifier (name);
391 while (IDENTIFIER_TRANSPARENT_ALIAS (id))
392 id = TREE_CHAIN (id);
395 name = IDENTIFIER_POINTER (id);
396 namelen = strlen (name);
408 needs_quotes = name_needs_quotes (name);
415 suffix = STUB_SUFFIX;
417 suffix = NON_LAZY_POINTER_SUFFIX;
419 buffer = alloca (strlen ("&L")
426 /* Construct the name of the non-lazy pointer or stub. */
427 sprintf (buffer, "&%sL%s%s%s%s", quote, prefix, name, suffix, quote);
429 if (!machopic_indirections)
430 machopic_indirections = htab_create_ggc (37,
431 machopic_indirection_hash,
432 machopic_indirection_eq,
435 slot = htab_find_slot_with_hash (machopic_indirections, buffer,
436 htab_hash_string (buffer), INSERT);
439 p = (machopic_indirection *) *slot;
443 p = (machopic_indirection *) ggc_alloc (sizeof (machopic_indirection));
445 p->ptr_name = xstrdup (buffer);
454 /* Return the name of the stub for the mcount function. */
457 machopic_mcount_stub_name (void)
459 rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "*mcount");
460 return machopic_indirection_name (symbol, /*stub_p=*/true);
463 /* If NAME is the name of a stub or a non-lazy pointer , mark the stub
464 or non-lazy pointer as used -- and mark the object to which the
465 pointer/stub refers as used as well, since the pointer/stub will
466 emit a reference to it. */
469 machopic_validate_stub_or_non_lazy_ptr (const char *name)
471 machopic_indirection *p;
473 p = ((machopic_indirection *)
474 (htab_find_with_hash (machopic_indirections, name,
475 htab_hash_string (name))));
478 const char *real_name;
483 /* Do what output_addr_const will do when we actually call it. */
484 if (SYMBOL_REF_DECL (p->symbol))
485 mark_decl_referenced (SYMBOL_REF_DECL (p->symbol));
487 real_name = targetm.strip_name_encoding (XSTR (p->symbol, 0));
489 id = maybe_get_identifier (real_name);
491 mark_referenced (id);
495 /* Transform ORIG, which may be any data source, to the corresponding
496 source using indirections. */
499 machopic_indirect_data_reference (rtx orig, rtx reg)
503 if (! MACHOPIC_INDIRECT)
506 if (GET_CODE (orig) == SYMBOL_REF)
508 int defined = machopic_data_defined_p (orig);
510 if (defined && MACHO_DYNAMIC_NO_PIC_P)
512 #if defined (TARGET_TOC)
513 /* Create a new register for CSE opportunities. */
514 rtx hi_reg = (no_new_pseudos ? reg : gen_reg_rtx (Pmode));
515 emit_insn (gen_macho_high (hi_reg, orig));
516 emit_insn (gen_macho_low (reg, hi_reg, orig));
518 /* some other cpu -- writeme! */
525 #if defined (TARGET_TOC) || defined (HAVE_lo_sum)
526 rtx pic_base = machopic_function_base_sym ();
527 rtx offset = gen_pic_offset (orig, pic_base);
530 #if defined (TARGET_TOC) /* i.e., PowerPC */
531 rtx hi_sum_reg = (no_new_pseudos ? reg : gen_reg_rtx (Pmode));
535 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
536 gen_rtx_PLUS (Pmode, pic_offset_table_rtx,
537 gen_rtx_HIGH (Pmode, offset))));
538 emit_insn (gen_rtx_SET (Pmode, reg,
539 gen_rtx_LO_SUM (Pmode, hi_sum_reg, offset)));
543 #if defined (HAVE_lo_sum)
546 emit_insn (gen_rtx_SET (VOIDmode, reg,
547 gen_rtx_HIGH (Pmode, offset)));
548 emit_insn (gen_rtx_SET (VOIDmode, reg,
549 gen_rtx_LO_SUM (Pmode, reg, offset)));
550 emit_insn (gen_rtx_USE (VOIDmode, pic_offset_table_rtx));
552 orig = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, reg);
558 ptr_ref = (gen_rtx_SYMBOL_REF
560 machopic_indirection_name (orig, /*stub_p=*/false)));
562 SYMBOL_REF_DECL (ptr_ref) = SYMBOL_REF_DECL (orig);
564 ptr_ref = gen_const_mem (Pmode, ptr_ref);
565 machopic_define_symbol (ptr_ref);
569 else if (GET_CODE (orig) == CONST)
573 /* legitimize both operands of the PLUS */
574 if (GET_CODE (XEXP (orig, 0)) == PLUS)
576 base = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 0),
578 orig = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 1),
579 (base == reg ? 0 : reg));
584 if (MACHOPIC_PURE && GET_CODE (orig) == CONST_INT)
585 result = plus_constant (base, INTVAL (orig));
587 result = gen_rtx_PLUS (Pmode, base, orig);
589 if (MACHOPIC_JUST_INDIRECT && GET_CODE (base) == MEM)
593 emit_move_insn (reg, result);
598 result = force_reg (GET_MODE (result), result);
605 else if (GET_CODE (orig) == MEM)
606 XEXP (ptr_ref, 0) = machopic_indirect_data_reference (XEXP (orig, 0), reg);
607 /* When the target is i386, this code prevents crashes due to the
608 compiler's ignorance on how to move the PIC base register to
609 other registers. (The reload phase sometimes introduces such
611 else if (GET_CODE (orig) == PLUS
612 && GET_CODE (XEXP (orig, 0)) == REG
613 && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM
615 /* Prevent the same register from being erroneously used
616 as both the base and index registers. */
617 && GET_CODE (XEXP (orig, 1)) == CONST
621 emit_move_insn (reg, XEXP (orig, 0));
622 XEXP (ptr_ref, 0) = reg;
627 /* Transform TARGET (a MEM), which is a function call target, to the
628 corresponding symbol_stub if necessary. Return a new MEM. */
631 machopic_indirect_call_target (rtx target)
633 if (GET_CODE (target) != MEM)
636 if (MACHOPIC_INDIRECT
637 && GET_CODE (XEXP (target, 0)) == SYMBOL_REF
638 && !(SYMBOL_REF_FLAGS (XEXP (target, 0))
639 & MACHO_SYMBOL_FLAG_DEFINED))
641 rtx sym_ref = XEXP (target, 0);
642 const char *stub_name = machopic_indirection_name (sym_ref,
644 enum machine_mode mode = GET_MODE (sym_ref);
645 tree decl = SYMBOL_REF_DECL (sym_ref);
647 XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name);
648 SYMBOL_REF_DECL (XEXP (target, 0)) = decl;
649 MEM_READONLY_P (target) = 1;
650 MEM_NOTRAP_P (target) = 1;
657 machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg)
661 if (! MACHOPIC_INDIRECT)
664 /* First handle a simple SYMBOL_REF or LABEL_REF */
665 if (GET_CODE (orig) == LABEL_REF
666 || (GET_CODE (orig) == SYMBOL_REF
669 /* addr(foo) = &func+(foo-func) */
672 orig = machopic_indirect_data_reference (orig, reg);
674 if (GET_CODE (orig) == PLUS
675 && GET_CODE (XEXP (orig, 0)) == REG)
678 return force_reg (mode, orig);
680 emit_move_insn (reg, orig);
684 /* if dynamic-no-pic we don't have a pic base */
685 if (MACHO_DYNAMIC_NO_PIC_P)
688 pic_base = machopic_function_base_sym ();
690 if (GET_CODE (orig) == MEM)
694 gcc_assert (!reload_in_progress);
695 reg = gen_reg_rtx (Pmode);
699 if (MACHO_DYNAMIC_NO_PIC_P
700 && (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
701 || GET_CODE (XEXP (orig, 0)) == LABEL_REF))
703 #if defined (TARGET_TOC) /* ppc */
704 rtx temp_reg = (no_new_pseudos) ? reg : gen_reg_rtx (Pmode);
705 rtx asym = XEXP (orig, 0);
708 emit_insn (gen_macho_high (temp_reg, asym));
709 mem = gen_const_mem (GET_MODE (orig),
710 gen_rtx_LO_SUM (Pmode, temp_reg, asym));
711 emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
713 /* Some other CPU -- WriteMe! but right now there are no other platform that can use dynamic-no-pic */
719 if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
720 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
722 rtx offset = gen_pic_offset (XEXP (orig, 0), pic_base);
723 #if defined (TARGET_TOC) /* i.e., PowerPC */
724 /* Generating a new reg may expose opportunities for
725 common subexpression elimination. */
726 rtx hi_sum_reg = no_new_pseudos ? reg : gen_reg_rtx (Pmode);
731 sum = gen_rtx_HIGH (Pmode, offset);
732 if (! MACHO_DYNAMIC_NO_PIC_P)
733 sum = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, sum);
735 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, sum));
737 mem = gen_const_mem (GET_MODE (orig),
738 gen_rtx_LO_SUM (Pmode,
739 hi_sum_reg, offset));
740 insn = emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
741 REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUAL, pic_ref,
746 emit_insn (gen_rtx_USE (VOIDmode,
748 PIC_OFFSET_TABLE_REGNUM)));
750 emit_insn (gen_rtx_SET (VOIDmode, reg,
752 gen_rtx_CONST (Pmode,
754 emit_insn (gen_rtx_SET (VOIDmode, reg,
755 gen_rtx_LO_SUM (Pmode, reg,
756 gen_rtx_CONST (Pmode, offset))));
757 pic_ref = gen_rtx_PLUS (Pmode,
758 pic_offset_table_rtx, reg);
762 #endif /* HAVE_lo_sum */
764 rtx pic = pic_offset_table_rtx;
765 if (GET_CODE (pic) != REG)
767 emit_move_insn (reg, pic);
771 emit_insn (gen_rtx_USE (VOIDmode,
773 PIC_OFFSET_TABLE_REGNUM)));
776 if (reload_in_progress)
777 regs_ever_live[REGNO (pic)] = 1;
778 pic_ref = gen_rtx_PLUS (Pmode, pic,
779 gen_pic_offset (XEXP (orig, 0),
783 #if !defined (TARGET_TOC)
784 emit_move_insn (reg, pic_ref);
785 pic_ref = gen_const_mem (GET_MODE (orig), reg);
792 if (GET_CODE (orig) == SYMBOL_REF
793 || GET_CODE (orig) == LABEL_REF)
795 rtx offset = gen_pic_offset (orig, pic_base);
796 #if defined (TARGET_TOC) /* i.e., PowerPC */
801 gcc_assert (!reload_in_progress);
802 reg = gen_reg_rtx (Pmode);
807 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
808 (MACHO_DYNAMIC_NO_PIC_P)
809 ? gen_rtx_HIGH (Pmode, offset)
810 : gen_rtx_PLUS (Pmode,
811 pic_offset_table_rtx,
814 emit_insn (gen_rtx_SET (VOIDmode, reg,
815 gen_rtx_LO_SUM (Pmode,
816 hi_sum_reg, offset)));
819 emit_insn (gen_rtx_SET (VOIDmode, reg,
820 gen_rtx_HIGH (Pmode, offset)));
821 emit_insn (gen_rtx_SET (VOIDmode, reg,
822 gen_rtx_LO_SUM (Pmode, reg, offset)));
823 pic_ref = gen_rtx_PLUS (Pmode,
824 pic_offset_table_rtx, reg);
828 #endif /* HAVE_lo_sum */
831 || GET_CODE (orig) == SUBREG)
837 rtx pic = pic_offset_table_rtx;
838 if (GET_CODE (pic) != REG)
840 emit_move_insn (reg, pic);
844 emit_insn (gen_rtx_USE (VOIDmode,
845 pic_offset_table_rtx));
847 if (reload_in_progress)
848 regs_ever_live[REGNO (pic)] = 1;
849 pic_ref = gen_rtx_PLUS (Pmode,
851 gen_pic_offset (orig, pic_base));
856 if (GET_CODE (pic_ref) != REG)
860 emit_move_insn (reg, pic_ref);
865 return force_reg (mode, pic_ref);
874 else if (GET_CODE (orig) == SYMBOL_REF)
877 else if (GET_CODE (orig) == PLUS
878 && (GET_CODE (XEXP (orig, 0)) == MEM
879 || GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
880 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
881 && XEXP (orig, 0) != pic_offset_table_rtx
882 && GET_CODE (XEXP (orig, 1)) != REG)
886 int is_complex = (GET_CODE (XEXP (orig, 0)) == MEM);
888 base = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
889 orig = machopic_legitimize_pic_address (XEXP (orig, 1),
890 Pmode, (base == reg ? 0 : reg));
891 if (GET_CODE (orig) == CONST_INT)
893 pic_ref = plus_constant (base, INTVAL (orig));
897 pic_ref = gen_rtx_PLUS (Pmode, base, orig);
899 if (reg && is_complex)
901 emit_move_insn (reg, pic_ref);
904 /* Likewise, should we set special REG_NOTEs here? */
907 else if (GET_CODE (orig) == CONST)
909 return machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
912 else if (GET_CODE (orig) == MEM
913 && GET_CODE (XEXP (orig, 0)) == SYMBOL_REF)
915 rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
916 addr = replace_equiv_address (orig, addr);
917 emit_move_insn (reg, addr);
924 /* Output the stub or non-lazy pointer in *SLOT, if it has been used.
925 DATA is the FILE* for assembly output. Called from
929 machopic_output_indirection (void **slot, void *data)
931 machopic_indirection *p = *((machopic_indirection **) slot);
932 FILE *asm_out_file = (FILE *) data;
934 const char *sym_name;
935 const char *ptr_name;
941 sym_name = XSTR (symbol, 0);
942 ptr_name = p->ptr_name;
950 id = maybe_get_identifier (sym_name);
955 while (IDENTIFIER_TRANSPARENT_ALIAS (id))
956 id = TREE_CHAIN (id);
958 sym_name = IDENTIFIER_POINTER (id);
961 sym = alloca (strlen (sym_name) + 2);
962 if (sym_name[0] == '*' || sym_name[0] == '&')
963 strcpy (sym, sym_name + 1);
964 else if (sym_name[0] == '-' || sym_name[0] == '+')
965 strcpy (sym, sym_name);
967 sprintf (sym, "%s%s", user_label_prefix, sym_name);
969 stub = alloca (strlen (ptr_name) + 2);
970 if (ptr_name[0] == '*' || ptr_name[0] == '&')
971 strcpy (stub, ptr_name + 1);
973 sprintf (stub, "%s%s", user_label_prefix, ptr_name);
975 machopic_output_stub (asm_out_file, sym, stub);
977 else if (! indirect_data (symbol)
978 && (machopic_symbol_defined_p (symbol)
979 || SYMBOL_REF_LOCAL_P (symbol)))
981 switch_to_section (data_section);
982 assemble_align (GET_MODE_ALIGNMENT (Pmode));
983 assemble_label (ptr_name);
984 assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name),
985 GET_MODE_SIZE (Pmode),
986 GET_MODE_ALIGNMENT (Pmode), 1);
990 rtx init = const0_rtx;
992 switch_to_section (darwin_sections[machopic_nl_symbol_ptr_section]);
993 assemble_name (asm_out_file, ptr_name);
994 fprintf (asm_out_file, ":\n");
996 fprintf (asm_out_file, "\t.indirect_symbol ");
997 assemble_name (asm_out_file, sym_name);
998 fprintf (asm_out_file, "\n");
1000 /* Variables that are marked with MACHO_SYMBOL_STATIC need to
1001 have their symbol name instead of 0 in the second entry of
1002 the non-lazy symbol pointer data structure when they are
1003 defined. This allows the runtime to rebind newer instances
1004 of the translation unit with the original instance of the
1007 if ((SYMBOL_REF_FLAGS (symbol) & MACHO_SYMBOL_STATIC)
1008 && machopic_symbol_defined_p (symbol))
1009 init = gen_rtx_SYMBOL_REF (Pmode, sym_name);
1011 assemble_integer (init, GET_MODE_SIZE (Pmode),
1012 GET_MODE_ALIGNMENT (Pmode), 1);
1019 machopic_finish (FILE *asm_out_file)
1021 if (machopic_indirections)
1022 htab_traverse_noresize (machopic_indirections,
1023 machopic_output_indirection,
1028 machopic_operand_p (rtx op)
1030 if (MACHOPIC_JUST_INDIRECT)
1032 while (GET_CODE (op) == CONST)
1035 if (GET_CODE (op) == SYMBOL_REF)
1036 return machopic_symbol_defined_p (op);
1041 while (GET_CODE (op) == CONST)
1044 if (GET_CODE (op) == MINUS
1045 && GET_CODE (XEXP (op, 0)) == SYMBOL_REF
1046 && GET_CODE (XEXP (op, 1)) == SYMBOL_REF
1047 && machopic_symbol_defined_p (XEXP (op, 0))
1048 && machopic_symbol_defined_p (XEXP (op, 1)))
1054 /* This function records whether a given name corresponds to a defined
1055 or undefined function or variable, for machopic_classify_ident to
1059 darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
1063 /* Do the standard encoding things first. */
1064 default_encode_section_info (decl, rtl, first);
1066 if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
1069 sym_ref = XEXP (rtl, 0);
1070 if (TREE_CODE (decl) == VAR_DECL)
1071 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE;
1073 if (!DECL_EXTERNAL (decl)
1074 && (!TREE_PUBLIC (decl) || !DECL_WEAK (decl))
1075 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (decl))
1076 && ((TREE_STATIC (decl)
1077 && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl)))
1078 || (!DECL_COMMON (decl) && DECL_INITIAL (decl)
1079 && DECL_INITIAL (decl) != error_mark_node)))
1080 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
1082 if (! TREE_PUBLIC (decl))
1083 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_STATIC;
1087 darwin_mark_decl_preserved (const char *name)
1089 fprintf (asm_out_file, ".no_dead_strip ");
1090 assemble_name (asm_out_file, name);
1091 fputc ('\n', asm_out_file);
1095 machopic_select_section (tree exp, int reloc,
1096 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
1098 section *base_section;
1099 bool weak_p = (DECL_P (exp) && DECL_WEAK (exp)
1100 && (lookup_attribute ("weak", DECL_ATTRIBUTES (exp))
1101 || ! lookup_attribute ("weak_import",
1102 DECL_ATTRIBUTES (exp))));
1104 if (TREE_CODE (exp) == FUNCTION_DECL)
1107 base_section = (weak_p
1108 ? darwin_sections[text_unlikely_coal_section]
1109 : unlikely_text_section ());
1111 base_section = weak_p ? darwin_sections[text_coal_section] : text_section;
1113 else if (decl_readonly_section_1 (exp, reloc, MACHOPIC_INDIRECT))
1114 base_section = weak_p ? darwin_sections[const_coal_section] : darwin_sections[const_section];
1115 else if (TREE_READONLY (exp) || TREE_CONSTANT (exp))
1116 base_section = weak_p ? darwin_sections[const_data_coal_section] : darwin_sections[const_data_section];
1118 base_section = weak_p ? darwin_sections[data_coal_section] : data_section;
1120 if (TREE_CODE (exp) == STRING_CST
1121 && ((size_t) TREE_STRING_LENGTH (exp)
1122 == strlen (TREE_STRING_POINTER (exp)) + 1))
1123 return darwin_sections[cstring_section];
1124 else if ((TREE_CODE (exp) == INTEGER_CST || TREE_CODE (exp) == REAL_CST)
1125 && flag_merge_constants)
1127 tree size = TYPE_SIZE_UNIT (TREE_TYPE (exp));
1129 if (TREE_CODE (size) == INTEGER_CST &&
1130 TREE_INT_CST_LOW (size) == 4 &&
1131 TREE_INT_CST_HIGH (size) == 0)
1132 return darwin_sections[literal4_section];
1133 else if (TREE_CODE (size) == INTEGER_CST &&
1134 TREE_INT_CST_LOW (size) == 8 &&
1135 TREE_INT_CST_HIGH (size) == 0)
1136 return darwin_sections[literal8_section];
1138 return base_section;
1140 else if (TREE_CODE (exp) == CONSTRUCTOR
1142 && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE
1143 && TYPE_NAME (TREE_TYPE (exp)))
1145 tree name = TYPE_NAME (TREE_TYPE (exp));
1146 if (TREE_CODE (name) == TYPE_DECL)
1147 name = DECL_NAME (name);
1149 if (!strcmp (IDENTIFIER_POINTER (name), "__builtin_ObjCString"))
1151 if (flag_next_runtime)
1152 return darwin_sections[objc_constant_string_object_section];
1154 return darwin_sections[objc_string_object_section];
1157 return base_section;
1159 else if (TREE_CODE (exp) == VAR_DECL &&
1161 TREE_CODE (DECL_NAME (exp)) == IDENTIFIER_NODE &&
1162 IDENTIFIER_POINTER (DECL_NAME (exp)) &&
1163 !strncmp (IDENTIFIER_POINTER (DECL_NAME (exp)), "_OBJC_", 6))
1165 const char *name = IDENTIFIER_POINTER (DECL_NAME (exp));
1167 if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20))
1168 return darwin_sections[objc_cls_meth_section];
1169 else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23))
1170 return darwin_sections[objc_inst_meth_section];
1171 else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 20))
1172 return darwin_sections[objc_cat_cls_meth_section];
1173 else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 23))
1174 return darwin_sections[objc_cat_inst_meth_section];
1175 else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22))
1176 return darwin_sections[objc_class_vars_section];
1177 else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25))
1178 return darwin_sections[objc_instance_vars_section];
1179 else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22))
1180 return darwin_sections[objc_cat_cls_meth_section];
1181 else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17))
1182 return darwin_sections[objc_class_names_section];
1183 else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20))
1184 return darwin_sections[objc_meth_var_names_section];
1185 else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20))
1186 return darwin_sections[objc_meth_var_types_section];
1187 else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22))
1188 return darwin_sections[objc_cls_refs_section];
1189 else if (!strncmp (name, "_OBJC_CLASS_", 12))
1190 return darwin_sections[objc_class_section];
1191 else if (!strncmp (name, "_OBJC_METACLASS_", 16))
1192 return darwin_sections[objc_meta_class_section];
1193 else if (!strncmp (name, "_OBJC_CATEGORY_", 15))
1194 return darwin_sections[objc_category_section];
1195 else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25))
1196 return darwin_sections[objc_selector_refs_section];
1197 else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20))
1198 return darwin_sections[objc_selector_fixup_section];
1199 else if (!strncmp (name, "_OBJC_SYMBOLS", 13))
1200 return darwin_sections[objc_symbols_section];
1201 else if (!strncmp (name, "_OBJC_MODULES", 13))
1202 return darwin_sections[objc_module_info_section];
1203 else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16))
1204 return darwin_sections[objc_image_info_section];
1205 else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32))
1206 return darwin_sections[objc_cat_inst_meth_section];
1207 else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29))
1208 return darwin_sections[objc_cat_cls_meth_section];
1209 else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20))
1210 return darwin_sections[objc_cat_cls_meth_section];
1211 else if (!strncmp (name, "_OBJC_PROTOCOL_", 15))
1212 return darwin_sections[objc_protocol_section];
1214 return base_section;
1217 return base_section;
1220 /* This can be called with address expressions as "rtx".
1221 They must go in "const". */
1224 machopic_select_rtx_section (enum machine_mode mode, rtx x,
1225 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
1227 if (GET_MODE_SIZE (mode) == 8
1228 && (GET_CODE (x) == CONST_INT
1229 || GET_CODE (x) == CONST_DOUBLE))
1230 return darwin_sections[literal8_section];
1231 else if (GET_MODE_SIZE (mode) == 4
1232 && (GET_CODE (x) == CONST_INT
1233 || GET_CODE (x) == CONST_DOUBLE))
1234 return darwin_sections[literal4_section];
1235 else if (MACHOPIC_INDIRECT
1236 && (GET_CODE (x) == SYMBOL_REF
1237 || GET_CODE (x) == CONST
1238 || GET_CODE (x) == LABEL_REF))
1239 return darwin_sections[const_data_section];
1241 return darwin_sections[const_section];
1245 machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1247 if (MACHOPIC_INDIRECT)
1248 switch_to_section (darwin_sections[mod_init_section]);
1250 switch_to_section (darwin_sections[constructor_section]);
1251 assemble_align (POINTER_SIZE);
1252 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1254 if (! MACHOPIC_INDIRECT)
1255 fprintf (asm_out_file, ".reference .constructors_used\n");
1259 machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1261 if (MACHOPIC_INDIRECT)
1262 switch_to_section (darwin_sections[mod_term_section]);
1264 switch_to_section (darwin_sections[destructor_section]);
1265 assemble_align (POINTER_SIZE);
1266 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1268 if (! MACHOPIC_INDIRECT)
1269 fprintf (asm_out_file, ".reference .destructors_used\n");
1273 darwin_globalize_label (FILE *stream, const char *name)
1275 if (!!strncmp (name, "_OBJC_", 6))
1276 default_globalize_label (stream, name);
1280 darwin_asm_named_section (const char *name,
1281 unsigned int flags ATTRIBUTE_UNUSED,
1282 tree decl ATTRIBUTE_UNUSED)
1284 fprintf (asm_out_file, "\t.section %s\n", name);
1288 darwin_unique_section (tree decl ATTRIBUTE_UNUSED, int reloc ATTRIBUTE_UNUSED)
1290 /* Darwin does not use unique sections. */
1293 /* Handle a "weak_import" attribute; arguments as in
1294 struct attribute_spec.handler. */
1297 darwin_handle_weak_import_attribute (tree *node, tree name,
1298 tree ARG_UNUSED (args),
1299 int ARG_UNUSED (flags),
1300 bool * no_add_attrs)
1302 if (TREE_CODE (*node) != FUNCTION_DECL && TREE_CODE (*node) != VAR_DECL)
1304 warning (OPT_Wattributes, "%qs attribute ignored",
1305 IDENTIFIER_POINTER (name));
1306 *no_add_attrs = true;
1309 declare_weak (*node);
1315 no_dead_strip (FILE *file, const char *lab)
1317 fprintf (file, ".no_dead_strip %s\n", lab);
1320 /* Emit a label for an FDE, making it global and/or weak if appropriate.
1321 The third parameter is nonzero if this is for exception handling.
1322 The fourth parameter is nonzero if this is just a placeholder for an
1323 FDE that we are omitting. */
1326 darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty)
1328 tree id = DECL_ASSEMBLER_NAME (decl)
1329 ? DECL_ASSEMBLER_NAME (decl)
1332 const char *prefix = user_label_prefix;
1334 const char *base = IDENTIFIER_POINTER (id);
1335 unsigned int base_len = IDENTIFIER_LENGTH (id);
1337 const char *suffix = ".eh";
1339 int need_quotes = name_needs_quotes (base);
1340 int quotes_len = need_quotes ? 2 : 0;
1346 lab = xmalloc (strlen (prefix)
1347 + base_len + strlen (suffix) + quotes_len + 1);
1352 strcat(lab, prefix);
1354 strcat(lab, suffix);
1358 if (TREE_PUBLIC (decl))
1359 fprintf (file, "\t%s %s\n",
1360 (DECL_VISIBILITY (decl) != VISIBILITY_HIDDEN
1362 : ".private_extern"),
1365 if (DECL_WEAK (decl))
1366 fprintf (file, "\t.weak_definition %s\n", lab);
1370 fprintf (file, "%s = 0\n", lab);
1372 /* Mark the absolute .eh and .eh1 style labels as needed to
1373 ensure that we don't dead code strip them and keep such
1374 labels from another instantiation point until we can fix this
1375 properly with group comdat support. */
1376 no_dead_strip (file, lab);
1379 fprintf (file, "%s:\n", lab);
1384 static GTY(()) unsigned long except_table_label_num;
1387 darwin_emit_except_table_label (FILE *file)
1389 char section_start_label[30];
1391 ASM_GENERATE_INTERNAL_LABEL (section_start_label, "GCC_except_table",
1392 except_table_label_num++);
1393 ASM_OUTPUT_LABEL (file, section_start_label);
1395 /* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */
1398 darwin_non_lazy_pcrel (FILE *file, rtx addr)
1400 const char *nlp_name;
1402 gcc_assert (GET_CODE (addr) == SYMBOL_REF);
1404 nlp_name = machopic_indirection_name (addr, /*stub_p=*/false);
1405 fputs ("\t.long\t", file);
1406 ASM_OUTPUT_LABELREF (file, nlp_name);
1410 /* Emit an assembler directive to set visibility for a symbol. The
1411 only supported visibilities are VISIBILITY_DEFAULT and
1412 VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private
1413 extern". There is no MACH-O equivalent of ELF's
1414 VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */
1417 darwin_assemble_visibility (tree decl, int vis)
1419 if (vis == VISIBILITY_DEFAULT)
1421 else if (vis == VISIBILITY_HIDDEN)
1423 fputs ("\t.private_extern ", asm_out_file);
1424 assemble_name (asm_out_file,
1425 (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))));
1426 fputs ("\n", asm_out_file);
1429 warning (OPT_Wattributes, "internal and protected visibility attributes "
1430 "not supported in this configuration; ignored");
1433 /* Output a difference of two labels that will be an assembly time
1434 constant if the two labels are local. (.long lab1-lab2 will be
1435 very different if lab1 is at the boundary between two sections; it
1436 will be relocated according to the second section, not the first,
1437 so one ends up with a difference between labels in different
1438 sections, which is bad in the dwarf2 eh context for instance.) */
1440 static int darwin_dwarf_label_counter;
1443 darwin_asm_output_dwarf_delta (FILE *file, int size,
1444 const char *lab1, const char *lab2)
1446 int islocaldiff = (lab1[0] == '*' && lab1[1] == 'L'
1447 && lab2[0] == '*' && lab2[1] == 'L');
1448 const char *directive = (size == 8 ? ".quad" : ".long");
1451 fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter);
1453 fprintf (file, "\t%s\t", directive);
1454 assemble_name_raw (file, lab1);
1455 fprintf (file, "-");
1456 assemble_name_raw (file, lab2);
1458 fprintf (file, "\n\t%s L$set$%d", directive, darwin_dwarf_label_counter++);
1462 darwin_file_end (void)
1464 machopic_finish (asm_out_file);
1465 if (strcmp (lang_hooks.name, "GNU C++") == 0)
1467 switch_to_section (darwin_sections[constructor_section]);
1468 switch_to_section (darwin_sections[destructor_section]);
1469 ASM_OUTPUT_ALIGN (asm_out_file, 1);
1471 fprintf (asm_out_file, "\t.subsections_via_symbols\n");
1474 /* Cross-module name binding. Darwin does not support overriding
1475 functions at dynamic-link time. */
1478 darwin_binds_local_p (tree decl)
1480 return default_binds_local_p_1 (decl, 0);
1483 #include "gt-darwin.h"