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 Free Software Foundation, Inc.
4 Contributed by Apple Computer Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
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"
48 /* Darwin supports a feature called fix-and-continue, which is used
49 for rapid turn around debugging. When code is compiled with the
50 -mfix-and-continue flag, two changes are made to the generated code
51 that allow the system to do things that it would normally not be
52 able to do easily. These changes allow gdb to load in
53 recompilation of a translation unit that has been changed into a
54 running program and replace existing functions and methods of that
55 translation unit with with versions of those functions and methods
56 from the newly compiled translation unit. The new functions access
57 the existing static data from the old translation unit, if the data
58 existed in the unit to be replaced, and from the new translation
61 The changes are to insert 4 nops at the beginning of all functions
62 and to use indirection to get at static duration data. The 4 nops
63 are required by consumers of the generated code. Currently, gdb
64 uses this to patch in a jump to the overriding function, this
65 allows all uses of the old name to forward to the replacement,
66 including existing function pointers and virtual methods. See
67 rs6000_emit_prologue for the code that handles the nop insertions.
69 The added indirection allows gdb to redirect accesses to static
70 duration data from the newly loaded translation unit to the
71 existing data, if any. @code{static} data is special and is
72 handled by setting the second word in the .non_lazy_symbol_pointer
73 data structure to the address of the data. See indirect_data for
74 the code that handles the extra indirection, and
75 machopic_output_indirection and its use of MACHO_SYMBOL_STATIC for
76 the code that handles @code{static} data indirection. */
79 /* Nonzero if the user passes the -mone-byte-bool switch, which forces
80 sizeof(bool) to be 1. */
81 const char *darwin_one_byte_bool = 0;
84 name_needs_quotes (const char *name)
87 while ((c = *name++) != '\0')
88 if (! ISIDNUM (c) && c != '.' && c != '$')
94 * flag_pic = 1 ... generate only indirections
95 * flag_pic = 2 ... generate indirections and pure code
99 machopic_symbol_defined_p (rtx sym_ref)
101 return (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED)
102 || (SYMBOL_REF_LOCAL_P (sym_ref) && ! SYMBOL_REF_EXTERNAL_P (sym_ref));
105 /* This module assumes that (const (symbol_ref "foo")) is a legal pic
106 reference, which will not be changed. */
108 enum machopic_addr_class
109 machopic_classify_symbol (rtx sym_ref)
114 flags = SYMBOL_REF_FLAGS (sym_ref);
115 function_p = SYMBOL_REF_FUNCTION_P (sym_ref);
116 if (machopic_symbol_defined_p (sym_ref))
118 ? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA);
121 ? MACHOPIC_UNDEFINED_FUNCTION : MACHOPIC_UNDEFINED_DATA);
124 #ifndef TARGET_FIX_AND_CONTINUE
125 #define TARGET_FIX_AND_CONTINUE 0
128 /* Indicate when fix-and-continue style code generation is being used
129 and when a reference to data should be indirected so that it can be
130 rebound in a new translation unit to refernce the original instance
131 of that data. Symbol names that are for code generation local to
132 the translation unit are bound to the new translation unit;
133 currently this means symbols that begin with L or _OBJC_;
134 otherwise, we indicate that an indirect reference should be made to
135 permit the runtime to rebind new instances of the translation unit
136 to the original instance of the data. */
139 indirect_data (rtx sym_ref)
144 /* If we aren't generating fix-and-continue code, don't do anything special. */
145 if (TARGET_FIX_AND_CONTINUE == 0)
148 /* Otherwise, all symbol except symbols that begin with L or _OBJC_
149 are indirected. Symbols that begin with L and _OBJC_ are always
150 bound to the current translation unit as they are used for
151 generated local data of the translation unit. */
153 name = XSTR (sym_ref, 0);
155 lprefix = (((name[0] == '*' || name[0] == '&')
156 && (name[1] == 'L' || (name[1] == '"' && name[2] == 'L')))
157 || (strncmp (name, "_OBJC_", 6)));
164 machopic_data_defined_p (rtx sym_ref)
166 if (indirect_data (sym_ref))
169 switch (machopic_classify_symbol (sym_ref))
171 case MACHOPIC_DEFINED_DATA:
179 machopic_define_symbol (rtx mem)
182 if (GET_CODE (mem) != MEM)
184 sym_ref = XEXP (mem, 0);
185 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
188 static GTY(()) char * function_base;
191 machopic_function_base_name (void)
193 /* if dynamic-no-pic is on, we should not get here */
194 if (MACHO_DYNAMIC_NO_PIC_P)
197 if (function_base == NULL)
199 (char *) ggc_alloc_string ("<pic base>", sizeof ("<pic base>"));
201 current_function_uses_pic_offset_table = 1;
203 return function_base;
206 /* Return a SYMBOL_REF for the PIC function base. */
209 machopic_function_base_sym (void)
213 sym_ref = gen_rtx_SYMBOL_REF (Pmode, machopic_function_base_name ());
214 SYMBOL_REF_FLAGS (sym_ref)
215 |= (MACHO_SYMBOL_FLAG_VARIABLE | MACHO_SYMBOL_FLAG_DEFINED);
219 static GTY(()) const char * function_base_func_name;
220 static GTY(()) int current_pic_label_num;
223 machopic_output_function_base_name (FILE *file)
225 const char *current_name;
227 /* If dynamic-no-pic is on, we should not get here. */
228 if (MACHO_DYNAMIC_NO_PIC_P)
231 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
232 if (function_base_func_name != current_name)
234 ++current_pic_label_num;
235 function_base_func_name = current_name;
237 fprintf (file, "\"L%011d$pb\"", current_pic_label_num);
240 /* The suffix attached to non-lazy pointer symbols. */
241 #define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr"
242 /* The suffix attached to stub symbols. */
243 #define STUB_SUFFIX "$stub"
245 typedef struct machopic_indirection GTY (())
247 /* The SYMBOL_REF for the entity referenced. */
249 /* The name of the stub or non-lazy pointer. */
250 const char * ptr_name;
251 /* True iff this entry is for a stub (as opposed to a non-lazy
254 /* True iff this stub or pointer pointer has been referenced. */
256 } machopic_indirection;
258 /* A table mapping stub names and non-lazy pointer names to
259 SYMBOL_REFs for the stubbed-to and pointed-to entities. */
261 static GTY ((param_is (struct machopic_indirection))) htab_t
262 machopic_indirections;
264 /* Return a hash value for a SLOT in the indirections hash table. */
267 machopic_indirection_hash (const void *slot)
269 const machopic_indirection *p = (const machopic_indirection *) slot;
270 return htab_hash_string (p->ptr_name);
273 /* Returns true if the KEY is the same as that associated with
277 machopic_indirection_eq (const void *slot, const void *key)
279 return strcmp (((const machopic_indirection *) slot)->ptr_name, key) == 0;
282 /* Return the name of the non-lazy pointer (if STUB_P is false) or
283 stub (if STUB_B is true) corresponding to the given name. */
286 machopic_indirection_name (rtx sym_ref, bool stub_p)
289 const char *name = XSTR (sym_ref, 0);
290 size_t namelen = strlen (name);
291 machopic_indirection *p;
294 /* Construct the name of the non-lazy pointer or stub. */
297 int needs_quotes = name_needs_quotes (name);
298 buffer = alloca (strlen ("&L")
300 + strlen (STUB_SUFFIX)
301 + 2 /* possible quotes */
307 sprintf (buffer, "&\"L%s" STUB_SUFFIX "\"", name + 1);
309 sprintf (buffer, "&\"L%s%s" STUB_SUFFIX "\"", user_label_prefix,
312 else if (name[0] == '*')
313 sprintf (buffer, "&L%s" STUB_SUFFIX, name + 1);
315 sprintf (buffer, "&L%s%s" STUB_SUFFIX, user_label_prefix, name);
319 buffer = alloca (strlen ("&L")
320 + strlen (user_label_prefix)
322 + strlen (NON_LAZY_POINTER_SUFFIX)
325 sprintf (buffer, "&L%s" NON_LAZY_POINTER_SUFFIX, name + 1);
327 sprintf (buffer, "&L%s%s" NON_LAZY_POINTER_SUFFIX,
328 user_label_prefix, name);
331 if (!machopic_indirections)
332 machopic_indirections = htab_create_ggc (37,
333 machopic_indirection_hash,
334 machopic_indirection_eq,
337 slot = htab_find_slot_with_hash (machopic_indirections, buffer,
338 htab_hash_string (buffer), INSERT);
341 p = (machopic_indirection *) *slot;
345 p = (machopic_indirection *) ggc_alloc (sizeof (machopic_indirection));
347 p->ptr_name = xstrdup (buffer);
356 /* Return the name of the stub for the mcount function. */
359 machopic_mcount_stub_name (void)
361 rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "*mcount");
362 return machopic_indirection_name (symbol, /*stub_p=*/true);
365 /* If NAME is the name of a stub or a non-lazy pointer , mark the stub
366 or non-lazy pointer as used -- and mark the object to which the
367 pointer/stub refers as used as well, since the pointer/stub will
368 emit a reference to it. */
371 machopic_validate_stub_or_non_lazy_ptr (const char *name)
373 machopic_indirection *p;
375 p = ((machopic_indirection *)
376 (htab_find_with_hash (machopic_indirections, name,
377 htab_hash_string (name))));
380 const char *real_name;
385 /* Do exactly what assemble_name will do when we actually call it. */
386 real_name = targetm.strip_name_encoding (name);
388 id = maybe_get_identifier (real_name);
390 mark_referenced (id);
394 /* Transform ORIG, which may be any data source, to the corresponding
395 source using indirections. */
398 machopic_indirect_data_reference (rtx orig, rtx reg)
402 if (! MACHOPIC_INDIRECT)
405 if (GET_CODE (orig) == SYMBOL_REF)
407 int defined = machopic_data_defined_p (orig);
409 if (defined && MACHO_DYNAMIC_NO_PIC_P)
411 #if defined (TARGET_TOC)
412 emit_insn (GET_MODE (orig) == DImode
413 ? gen_macho_high_di (reg, orig)
414 : gen_macho_high (reg, orig));
415 emit_insn (GET_MODE (orig) == DImode
416 ? gen_macho_low_di (reg, reg, orig)
417 : gen_macho_low (reg, reg, orig));
419 /* some other cpu -- writeme! */
426 #if defined (TARGET_TOC) || defined (HAVE_lo_sum)
427 rtx pic_base = machopic_function_base_sym ();
428 rtx offset = gen_rtx_CONST (Pmode,
429 gen_rtx_MINUS (Pmode, orig, pic_base));
432 #if defined (TARGET_TOC) /* i.e., PowerPC */
433 rtx hi_sum_reg = (no_new_pseudos ? reg : gen_reg_rtx (Pmode));
438 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
439 gen_rtx_PLUS (Pmode, pic_offset_table_rtx,
440 gen_rtx_HIGH (Pmode, offset))));
441 emit_insn (gen_rtx_SET (Pmode, reg,
442 gen_rtx_LO_SUM (Pmode, hi_sum_reg, offset)));
446 #if defined (HAVE_lo_sum)
447 if (reg == 0) abort ();
449 emit_insn (gen_rtx_SET (VOIDmode, reg,
450 gen_rtx_HIGH (Pmode, offset)));
451 emit_insn (gen_rtx_SET (VOIDmode, reg,
452 gen_rtx_LO_SUM (Pmode, reg, offset)));
453 emit_insn (gen_rtx_USE (VOIDmode, pic_offset_table_rtx));
455 orig = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, reg);
461 ptr_ref = (gen_rtx_SYMBOL_REF
463 machopic_indirection_name (orig, /*stub_p=*/false)));
465 SYMBOL_REF_DECL (ptr_ref) = SYMBOL_REF_DECL (orig);
467 ptr_ref = gen_const_mem (Pmode, ptr_ref);
468 machopic_define_symbol (ptr_ref);
472 else if (GET_CODE (orig) == CONST)
476 /* legitimize both operands of the PLUS */
477 if (GET_CODE (XEXP (orig, 0)) == PLUS)
479 base = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 0),
481 orig = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 1),
482 (base == reg ? 0 : reg));
487 if (MACHOPIC_PURE && GET_CODE (orig) == CONST_INT)
488 result = plus_constant (base, INTVAL (orig));
490 result = gen_rtx_PLUS (Pmode, base, orig);
492 if (MACHOPIC_JUST_INDIRECT && GET_CODE (base) == MEM)
496 emit_move_insn (reg, result);
501 result = force_reg (GET_MODE (result), result);
508 else if (GET_CODE (orig) == MEM)
509 XEXP (ptr_ref, 0) = machopic_indirect_data_reference (XEXP (orig, 0), reg);
510 /* When the target is i386, this code prevents crashes due to the
511 compiler's ignorance on how to move the PIC base register to
512 other registers. (The reload phase sometimes introduces such
514 else if (GET_CODE (orig) == PLUS
515 && GET_CODE (XEXP (orig, 0)) == REG
516 && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM
518 /* Prevent the same register from being erroneously used
519 as both the base and index registers. */
520 && GET_CODE (XEXP (orig, 1)) == CONST
524 emit_move_insn (reg, XEXP (orig, 0));
525 XEXP (ptr_ref, 0) = reg;
530 /* Transform TARGET (a MEM), which is a function call target, to the
531 corresponding symbol_stub if necessary. Return a new MEM. */
534 machopic_indirect_call_target (rtx target)
536 if (GET_CODE (target) != MEM)
539 if (MACHOPIC_INDIRECT
540 && GET_CODE (XEXP (target, 0)) == SYMBOL_REF
541 && !(SYMBOL_REF_FLAGS (XEXP (target, 0))
542 & MACHO_SYMBOL_FLAG_DEFINED))
544 rtx sym_ref = XEXP (target, 0);
545 const char *stub_name = machopic_indirection_name (sym_ref,
547 enum machine_mode mode = GET_MODE (sym_ref);
548 tree decl = SYMBOL_REF_DECL (sym_ref);
550 XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name);
551 SYMBOL_REF_DECL (XEXP (target, 0)) = decl;
552 MEM_READONLY_P (target) = 1;
553 MEM_NOTRAP_P (target) = 1;
560 machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg)
564 if (! MACHOPIC_INDIRECT)
567 /* First handle a simple SYMBOL_REF or LABEL_REF */
568 if (GET_CODE (orig) == LABEL_REF
569 || (GET_CODE (orig) == SYMBOL_REF
572 /* addr(foo) = &func+(foo-func) */
575 orig = machopic_indirect_data_reference (orig, reg);
577 if (GET_CODE (orig) == PLUS
578 && GET_CODE (XEXP (orig, 0)) == REG)
581 return force_reg (mode, orig);
583 emit_move_insn (reg, orig);
587 /* if dynamic-no-pic then use 0 as the pic base */
588 if (MACHO_DYNAMIC_NO_PIC_P)
589 pic_base = CONST0_RTX (Pmode);
591 pic_base = machopic_function_base_sym ();
593 if (GET_CODE (orig) == MEM)
597 if (reload_in_progress)
600 reg = gen_reg_rtx (Pmode);
604 if (MACHO_DYNAMIC_NO_PIC_P
605 && (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
606 || GET_CODE (XEXP (orig, 0)) == LABEL_REF))
608 #if defined (TARGET_TOC) /* ppc */
609 rtx temp_reg = (no_new_pseudos) ? reg : gen_reg_rtx (Pmode);
610 rtx asym = XEXP (orig, 0);
613 emit_insn (mode == DImode
614 ? gen_macho_high_di (temp_reg, asym)
615 : gen_macho_high (temp_reg, asym));
616 mem = gen_const_mem (GET_MODE (orig),
617 gen_rtx_LO_SUM (Pmode, temp_reg, asym));
618 emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
620 /* Some other CPU -- WriteMe! but right now there are no other platform that can use dynamic-no-pic */
626 if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
627 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
629 rtx offset = gen_rtx_CONST (Pmode,
630 gen_rtx_MINUS (Pmode,
633 #if defined (TARGET_TOC) /* i.e., PowerPC */
634 /* Generating a new reg may expose opportunities for
635 common subexpression elimination. */
636 rtx hi_sum_reg = no_new_pseudos ? reg : gen_reg_rtx (Pmode);
641 sum = gen_rtx_HIGH (Pmode, offset);
642 if (! MACHO_DYNAMIC_NO_PIC_P)
643 sum = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, sum);
645 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, sum));
647 mem = gen_const_mem (GET_MODE (orig),
648 gen_rtx_LO_SUM (Pmode,
649 hi_sum_reg, offset));
650 insn = emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
651 REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUAL, pic_ref,
656 emit_insn (gen_rtx_USE (VOIDmode,
658 PIC_OFFSET_TABLE_REGNUM)));
660 emit_insn (gen_rtx_SET (VOIDmode, reg,
662 gen_rtx_CONST (Pmode,
664 emit_insn (gen_rtx_SET (VOIDmode, reg,
665 gen_rtx_LO_SUM (Pmode, reg,
666 gen_rtx_CONST (Pmode, offset))));
667 pic_ref = gen_rtx_PLUS (Pmode,
668 pic_offset_table_rtx, reg);
672 #endif /* HAVE_lo_sum */
674 rtx pic = pic_offset_table_rtx;
675 if (GET_CODE (pic) != REG)
677 emit_move_insn (reg, pic);
681 emit_insn (gen_rtx_USE (VOIDmode,
683 PIC_OFFSET_TABLE_REGNUM)));
686 pic_ref = gen_rtx_PLUS (Pmode,
688 gen_rtx_CONST (Pmode,
689 gen_rtx_MINUS (Pmode,
694 #if !defined (TARGET_TOC)
695 emit_move_insn (reg, pic_ref);
696 pic_ref = gen_const_mem (GET_MODE (orig), reg);
703 if (GET_CODE (orig) == SYMBOL_REF
704 || GET_CODE (orig) == LABEL_REF)
706 rtx offset = gen_rtx_CONST (Pmode,
707 gen_rtx_MINUS (Pmode,
709 #if defined (TARGET_TOC) /* i.e., PowerPC */
714 if (reload_in_progress)
717 reg = gen_reg_rtx (Pmode);
722 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
723 (MACHO_DYNAMIC_NO_PIC_P)
724 ? gen_rtx_HIGH (Pmode, offset)
725 : gen_rtx_PLUS (Pmode,
726 pic_offset_table_rtx,
729 emit_insn (gen_rtx_SET (VOIDmode, reg,
730 gen_rtx_LO_SUM (Pmode,
731 hi_sum_reg, offset)));
734 emit_insn (gen_rtx_SET (VOIDmode, reg,
735 gen_rtx_HIGH (Pmode, offset)));
736 emit_insn (gen_rtx_SET (VOIDmode, reg,
737 gen_rtx_LO_SUM (Pmode, reg, offset)));
738 pic_ref = gen_rtx_PLUS (Pmode,
739 pic_offset_table_rtx, reg);
743 #endif /* HAVE_lo_sum */
745 if (GET_CODE (orig) == REG)
751 rtx pic = pic_offset_table_rtx;
752 if (GET_CODE (pic) != REG)
754 emit_move_insn (reg, pic);
758 emit_insn (gen_rtx_USE (VOIDmode,
759 pic_offset_table_rtx));
761 pic_ref = gen_rtx_PLUS (Pmode,
763 gen_rtx_CONST (Pmode,
764 gen_rtx_MINUS (Pmode,
770 if (GET_CODE (pic_ref) != REG)
774 emit_move_insn (reg, pic_ref);
779 return force_reg (mode, pic_ref);
788 else if (GET_CODE (orig) == SYMBOL_REF)
791 else if (GET_CODE (orig) == PLUS
792 && (GET_CODE (XEXP (orig, 0)) == MEM
793 || GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
794 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
795 && XEXP (orig, 0) != pic_offset_table_rtx
796 && GET_CODE (XEXP (orig, 1)) != REG)
800 int is_complex = (GET_CODE (XEXP (orig, 0)) == MEM);
802 base = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
803 orig = machopic_legitimize_pic_address (XEXP (orig, 1),
804 Pmode, (base == reg ? 0 : reg));
805 if (GET_CODE (orig) == CONST_INT)
807 pic_ref = plus_constant (base, INTVAL (orig));
811 pic_ref = gen_rtx_PLUS (Pmode, base, orig);
813 if (reg && is_complex)
815 emit_move_insn (reg, pic_ref);
818 /* Likewise, should we set special REG_NOTEs here? */
821 else if (GET_CODE (orig) == CONST)
823 return machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
826 else if (GET_CODE (orig) == MEM
827 && GET_CODE (XEXP (orig, 0)) == SYMBOL_REF)
829 rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
830 addr = replace_equiv_address (orig, addr);
831 emit_move_insn (reg, addr);
838 /* Output the stub or non-lazy pointer in *SLOT, if it has been used.
839 DATA is the FILE* for assembly output. Called from
843 machopic_output_indirection (void **slot, void *data)
845 machopic_indirection *p = *((machopic_indirection **) slot);
846 FILE *asm_out_file = (FILE *) data;
848 const char *sym_name;
849 const char *ptr_name;
855 sym_name = XSTR (symbol, 0);
856 ptr_name = p->ptr_name;
863 sym = alloca (strlen (sym_name) + 2);
864 if (sym_name[0] == '*' || sym_name[0] == '&')
865 strcpy (sym, sym_name + 1);
866 else if (sym_name[0] == '-' || sym_name[0] == '+')
867 strcpy (sym, sym_name);
869 sprintf (sym, "%s%s", user_label_prefix, sym_name);
871 stub = alloca (strlen (ptr_name) + 2);
872 if (ptr_name[0] == '*' || ptr_name[0] == '&')
873 strcpy (stub, ptr_name + 1);
875 sprintf (stub, "%s%s", user_label_prefix, ptr_name);
877 machopic_output_stub (asm_out_file, sym, stub);
879 else if (! indirect_data (symbol)
880 && (machopic_symbol_defined_p (symbol)
881 || SYMBOL_REF_LOCAL_P (symbol)))
884 assemble_align (GET_MODE_ALIGNMENT (Pmode));
885 assemble_label (ptr_name);
886 assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name),
887 GET_MODE_SIZE (Pmode),
888 GET_MODE_ALIGNMENT (Pmode), 1);
892 rtx init = const0_rtx;
894 machopic_nl_symbol_ptr_section ();
895 assemble_name (asm_out_file, ptr_name);
896 fprintf (asm_out_file, ":\n");
898 fprintf (asm_out_file, "\t.indirect_symbol ");
899 assemble_name (asm_out_file, sym_name);
900 fprintf (asm_out_file, "\n");
902 /* Variables that are marked with MACHO_SYMBOL_STATIC need to
903 have their symbol name instead of 0 in the second entry of
904 the non-lazy symbol pointer data structure when they are
905 defined. This allows the runtime to rebind newer instances
906 of the translation unit with the original instance of the
909 if ((SYMBOL_REF_FLAGS (symbol) & MACHO_SYMBOL_STATIC)
910 && machopic_symbol_defined_p (symbol))
911 init = gen_rtx_SYMBOL_REF (Pmode, sym_name);
913 assemble_integer (init, GET_MODE_SIZE (Pmode),
914 GET_MODE_ALIGNMENT (Pmode), 1);
921 machopic_finish (FILE *asm_out_file)
923 if (machopic_indirections)
924 htab_traverse_noresize (machopic_indirections,
925 machopic_output_indirection,
930 machopic_operand_p (rtx op)
932 if (MACHOPIC_JUST_INDIRECT)
934 while (GET_CODE (op) == CONST)
937 if (GET_CODE (op) == SYMBOL_REF)
938 return machopic_symbol_defined_p (op);
943 while (GET_CODE (op) == CONST)
946 if (GET_CODE (op) == MINUS
947 && GET_CODE (XEXP (op, 0)) == SYMBOL_REF
948 && GET_CODE (XEXP (op, 1)) == SYMBOL_REF
949 && machopic_symbol_defined_p (XEXP (op, 0))
950 && machopic_symbol_defined_p (XEXP (op, 1)))
956 /* This function records whether a given name corresponds to a defined
957 or undefined function or variable, for machopic_classify_ident to
961 darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
965 /* Do the standard encoding things first. */
966 default_encode_section_info (decl, rtl, first);
968 if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
971 sym_ref = XEXP (rtl, 0);
972 if (TREE_CODE (decl) == VAR_DECL)
973 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE;
975 if (!DECL_EXTERNAL (decl)
976 && (!TREE_PUBLIC (decl) || (!DECL_ONE_ONLY (decl) && !DECL_WEAK (decl)))
977 && ((TREE_STATIC (decl)
978 && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl)))
979 || (!DECL_COMMON (decl) && DECL_INITIAL (decl)
980 && DECL_INITIAL (decl) != error_mark_node)))
981 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
983 if (TREE_CODE (decl) == VAR_DECL
984 && indirect_data (sym_ref)
985 && ! TREE_PUBLIC (decl))
986 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_STATIC;
989 static GTY(()) tree textcoal_section = 0;
990 static GTY(()) tree datacoal_section = 0;
993 darwin_make_decl_one_only (tree decl)
996 if (textcoal_section == 0)
998 static const char *ts = "__TEXT,__textcoal_nt,coalesced,no_toc";
999 static const char *ds = "__DATA,__datacoal_nt,coalesced,no_toc";
1000 textcoal_section = build_string (strlen (ts), ts);
1001 datacoal_section = build_string (strlen (ds), ds);
1004 sec = TREE_CODE (decl) == FUNCTION_DECL
1007 TREE_PUBLIC (decl) = 1;
1008 DECL_ONE_ONLY (decl) = 1;
1009 DECL_SECTION_NAME (decl) = sec;
1013 darwin_mark_decl_preserved (const char *name)
1015 fprintf (asm_out_file, ".no_dead_strip ");
1016 assemble_name (asm_out_file, name);
1017 fputc ('\n', asm_out_file);
1021 machopic_select_section (tree exp, int reloc,
1022 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
1024 void (*base_function)(void);
1026 if (decl_readonly_section_1 (exp, reloc, MACHOPIC_INDIRECT))
1027 base_function = readonly_data_section;
1028 else if (TREE_READONLY (exp) || TREE_CONSTANT (exp))
1029 base_function = const_data_section;
1031 base_function = data_section;
1033 if (TREE_CODE (exp) == STRING_CST
1034 && ((size_t) TREE_STRING_LENGTH (exp)
1035 == strlen (TREE_STRING_POINTER (exp)) + 1))
1037 else if ((TREE_CODE (exp) == INTEGER_CST || TREE_CODE (exp) == REAL_CST)
1038 && flag_merge_constants)
1040 tree size = TYPE_SIZE (TREE_TYPE (exp));
1042 if (TREE_CODE (size) == INTEGER_CST &&
1043 TREE_INT_CST_LOW (size) == 4 &&
1044 TREE_INT_CST_HIGH (size) == 0)
1045 literal4_section ();
1046 else if (TREE_CODE (size) == INTEGER_CST &&
1047 TREE_INT_CST_LOW (size) == 8 &&
1048 TREE_INT_CST_HIGH (size) == 0)
1049 literal8_section ();
1053 else if (TREE_CODE (exp) == CONSTRUCTOR
1055 && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE
1056 && TYPE_NAME (TREE_TYPE (exp)))
1058 tree name = TYPE_NAME (TREE_TYPE (exp));
1059 if (TREE_CODE (name) == TYPE_DECL)
1060 name = DECL_NAME (name);
1061 if (!strcmp (IDENTIFIER_POINTER (name), "NSConstantString"))
1062 objc_constant_string_object_section ();
1063 else if (!strcmp (IDENTIFIER_POINTER (name), "NXConstantString"))
1064 objc_string_object_section ();
1068 else if (TREE_CODE (exp) == VAR_DECL &&
1070 TREE_CODE (DECL_NAME (exp)) == IDENTIFIER_NODE &&
1071 IDENTIFIER_POINTER (DECL_NAME (exp)) &&
1072 !strncmp (IDENTIFIER_POINTER (DECL_NAME (exp)), "_OBJC_", 6))
1074 const char *name = IDENTIFIER_POINTER (DECL_NAME (exp));
1076 if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20))
1077 objc_cls_meth_section ();
1078 else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23))
1079 objc_inst_meth_section ();
1080 else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 20))
1081 objc_cat_cls_meth_section ();
1082 else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 23))
1083 objc_cat_inst_meth_section ();
1084 else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22))
1085 objc_class_vars_section ();
1086 else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25))
1087 objc_instance_vars_section ();
1088 else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22))
1089 objc_cat_cls_meth_section ();
1090 else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17))
1091 objc_class_names_section ();
1092 else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20))
1093 objc_meth_var_names_section ();
1094 else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20))
1095 objc_meth_var_types_section ();
1096 else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22))
1097 objc_cls_refs_section ();
1098 else if (!strncmp (name, "_OBJC_CLASS_", 12))
1099 objc_class_section ();
1100 else if (!strncmp (name, "_OBJC_METACLASS_", 16))
1101 objc_meta_class_section ();
1102 else if (!strncmp (name, "_OBJC_CATEGORY_", 15))
1103 objc_category_section ();
1104 else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25))
1105 objc_selector_refs_section ();
1106 else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20))
1107 objc_selector_fixup_section ();
1108 else if (!strncmp (name, "_OBJC_SYMBOLS", 13))
1109 objc_symbols_section ();
1110 else if (!strncmp (name, "_OBJC_MODULES", 13))
1111 objc_module_info_section ();
1112 else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16))
1113 objc_image_info_section ();
1114 else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32))
1115 objc_cat_inst_meth_section ();
1116 else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29))
1117 objc_cat_cls_meth_section ();
1118 else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20))
1119 objc_cat_cls_meth_section ();
1120 else if (!strncmp (name, "_OBJC_PROTOCOL_", 15))
1121 objc_protocol_section ();
1129 /* This can be called with address expressions as "rtx".
1130 They must go in "const". */
1133 machopic_select_rtx_section (enum machine_mode mode, rtx x,
1134 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
1136 if (GET_MODE_SIZE (mode) == 8)
1137 literal8_section ();
1138 else if (GET_MODE_SIZE (mode) == 4
1139 && (GET_CODE (x) == CONST_INT
1140 || GET_CODE (x) == CONST_DOUBLE))
1141 literal4_section ();
1142 else if (MACHOPIC_INDIRECT
1143 && (GET_CODE (x) == SYMBOL_REF
1144 || GET_CODE (x) == CONST
1145 || GET_CODE (x) == LABEL_REF))
1146 const_data_section ();
1152 machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1154 if (MACHOPIC_INDIRECT)
1155 mod_init_section ();
1157 constructor_section ();
1158 assemble_align (POINTER_SIZE);
1159 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1161 if (! MACHOPIC_INDIRECT)
1162 fprintf (asm_out_file, ".reference .constructors_used\n");
1166 machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1168 if (MACHOPIC_INDIRECT)
1169 mod_term_section ();
1171 destructor_section ();
1172 assemble_align (POINTER_SIZE);
1173 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1175 if (! MACHOPIC_INDIRECT)
1176 fprintf (asm_out_file, ".reference .destructors_used\n");
1180 darwin_globalize_label (FILE *stream, const char *name)
1182 if (!!strncmp (name, "_OBJC_", 6))
1183 default_globalize_label (stream, name);
1187 darwin_asm_named_section (const char *name, unsigned int flags ATTRIBUTE_UNUSED)
1189 fprintf (asm_out_file, ".section %s\n", name);
1193 darwin_section_type_flags (tree decl, const char *name, int reloc)
1195 unsigned int flags = default_section_type_flags (decl, name, reloc);
1197 /* Weak or linkonce variables live in a writable section. */
1198 if (decl != 0 && TREE_CODE (decl) != FUNCTION_DECL
1199 && (DECL_WEAK (decl) || DECL_ONE_ONLY (decl)))
1200 flags |= SECTION_WRITE;
1206 darwin_unique_section (tree decl, int reloc ATTRIBUTE_UNUSED)
1208 /* Darwin does not use unique sections. However, the target's
1209 unique_section hook is called for linkonce symbols. We need
1210 to set an appropriate section for such symbols. */
1211 if (DECL_ONE_ONLY (decl) && !DECL_SECTION_NAME (decl))
1212 darwin_make_decl_one_only (decl);
1215 #define HAVE_DEAD_STRIP 0
1218 no_dead_strip (FILE *file, const char *lab)
1220 if (HAVE_DEAD_STRIP)
1221 fprintf (file, ".no_dead_strip %s\n", lab);
1224 /* Emit a label for an FDE, making it global and/or weak if appropriate.
1225 The third parameter is nonzero if this is for exception handling.
1226 The fourth parameter is nonzero if this is just a placeholder for an
1227 FDE that we are omitting. */
1230 darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty)
1232 tree id = DECL_ASSEMBLER_NAME (decl)
1233 ? DECL_ASSEMBLER_NAME (decl)
1236 const char *prefix = "_";
1237 const int prefix_len = 1;
1239 const char *base = IDENTIFIER_POINTER (id);
1240 unsigned int base_len = IDENTIFIER_LENGTH (id);
1242 const char *suffix = ".eh";
1244 int need_quotes = name_needs_quotes (base);
1245 int quotes_len = need_quotes ? 2 : 0;
1251 lab = xmalloc (prefix_len + base_len + strlen (suffix) + quotes_len + 1);
1256 strcat(lab, prefix);
1258 strcat(lab, suffix);
1262 if (TREE_PUBLIC (decl))
1263 fprintf (file, "%s %s\n",
1264 (DECL_VISIBILITY (decl) != VISIBILITY_HIDDEN
1266 : ".private_extern"),
1269 if (DECL_ONE_ONLY (decl) && TREE_PUBLIC (decl))
1270 fprintf (file, ".weak_definition %s\n", lab);
1274 fprintf (file, "%s = 0\n", lab);
1276 /* Mark the absolute .eh and .eh1 style labels as needed to
1277 ensure that we don't dead code strip them and keep such
1278 labels from another instantiation point until we can fix this
1279 properly with group comdat support. */
1280 no_dead_strip (file, lab);
1283 fprintf (file, "%s:\n", lab);
1288 /* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */
1291 darwin_non_lazy_pcrel (FILE *file, rtx addr)
1293 const char *nlp_name;
1295 if (GET_CODE (addr) != SYMBOL_REF)
1298 nlp_name = machopic_indirection_name (addr, /*stub_p=*/false);
1299 fputs ("\t.long\t", file);
1300 ASM_OUTPUT_LABELREF (file, nlp_name);
1304 /* Emit an assembler directive to set visibility for a symbol. The
1305 only supported visibilities are VISIBILITY_DEFAULT and
1306 VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private
1307 extern". There is no MACH-O equivalent of ELF's
1308 VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */
1311 darwin_assemble_visibility (tree decl, int vis)
1313 if (vis == VISIBILITY_DEFAULT)
1315 else if (vis == VISIBILITY_HIDDEN)
1317 fputs ("\t.private_extern ", asm_out_file);
1318 assemble_name (asm_out_file,
1319 (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))));
1320 fputs ("\n", asm_out_file);
1323 warning ("internal and protected visibility attributes not supported"
1324 "in this configuration; ignored");
1327 /* Output a difference of two labels that will be an assembly time
1328 constant if the two labels are local. (.long lab1-lab2 will be
1329 very different if lab1 is at the boundary between two sections; it
1330 will be relocated according to the second section, not the first,
1331 so one ends up with a difference between labels in different
1332 sections, which is bad in the dwarf2 eh context for instance.) */
1334 static int darwin_dwarf_label_counter;
1337 darwin_asm_output_dwarf_delta (FILE *file, int size ATTRIBUTE_UNUSED,
1338 const char *lab1, const char *lab2)
1340 int islocaldiff = (lab1[0] == '*' && lab1[1] == 'L'
1341 && lab2[0] == '*' && lab2[1] == 'L');
1344 fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter);
1346 fprintf (file, "\t%s\t", ".long");
1347 assemble_name (file, lab1);
1348 fprintf (file, "-");
1349 assemble_name (file, lab2);
1351 fprintf (file, "\n\t.long L$set$%d", darwin_dwarf_label_counter++);
1355 darwin_file_end (void)
1357 machopic_finish (asm_out_file);
1358 if (strcmp (lang_hooks.name, "GNU C++") == 0)
1360 constructor_section ();
1361 destructor_section ();
1362 ASM_OUTPUT_ALIGN (asm_out_file, 1);
1364 fprintf (asm_out_file, "\t.subsections_via_symbols\n");
1367 /* True, iff we're generating fast turn around debugging code. When
1368 true, we arrange for function prologues to start with 4 nops so
1369 that gdb may insert code to redirect them, and for data to accessed
1370 indirectly. The runtime uses this indirection to forward
1371 references for data to the original instance of that data. */
1373 int darwin_fix_and_continue;
1374 const char *darwin_fix_and_continue_switch;
1376 #include "gt-darwin.h"