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"
47 /* Nonzero if the user passes the -mone-byte-bool switch, which forces
48 sizeof(bool) to be 1. */
49 const char *darwin_one_byte_bool = 0;
52 name_needs_quotes (const char *name)
55 while ((c = *name++) != '\0')
56 if (! ISIDNUM (c) && c != '.' && c != '$')
62 * flag_pic = 1 ... generate only indirections
63 * flag_pic = 2 ... generate indirections and pure code
67 machopic_symbol_defined_p (rtx sym_ref)
69 return ((SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED)
70 /* Local symbols must always be defined. */
71 || SYMBOL_REF_LOCAL_P (sym_ref));
74 /* This module assumes that (const (symbol_ref "foo")) is a legal pic
75 reference, which will not be changed. */
77 enum machopic_addr_class
78 machopic_classify_symbol (rtx sym_ref)
83 flags = SYMBOL_REF_FLAGS (sym_ref);
84 function_p = SYMBOL_REF_FUNCTION_P (sym_ref);
85 if (machopic_symbol_defined_p (sym_ref))
87 ? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA);
90 ? MACHOPIC_UNDEFINED_FUNCTION : MACHOPIC_UNDEFINED_DATA);
94 machopic_data_defined_p (rtx sym_ref)
96 switch (machopic_classify_symbol (sym_ref))
98 case MACHOPIC_DEFINED_DATA:
106 machopic_define_symbol (rtx mem)
109 if (GET_CODE (mem) != MEM)
111 sym_ref = XEXP (mem, 0);
112 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
115 static GTY(()) char * function_base;
118 machopic_function_base_name (void)
120 /* if dynamic-no-pic is on, we should not get here */
121 if (MACHO_DYNAMIC_NO_PIC_P)
124 if (function_base == NULL)
126 (char *) ggc_alloc_string ("<pic base>", sizeof ("<pic base>"));
128 current_function_uses_pic_offset_table = 1;
130 return function_base;
133 /* Return a SYMBOL_REF for the PIC function base. */
136 machopic_function_base_sym (void)
140 sym_ref = gen_rtx_SYMBOL_REF (Pmode, machopic_function_base_name ());
141 SYMBOL_REF_FLAGS (sym_ref)
142 |= (MACHO_SYMBOL_FLAG_VARIABLE | MACHO_SYMBOL_FLAG_DEFINED);
146 static GTY(()) const char * function_base_func_name;
147 static GTY(()) int current_pic_label_num;
150 machopic_output_function_base_name (FILE *file)
152 const char *current_name;
154 /* If dynamic-no-pic is on, we should not get here. */
155 if (MACHO_DYNAMIC_NO_PIC_P)
158 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
159 if (function_base_func_name != current_name)
161 ++current_pic_label_num;
162 function_base_func_name = current_name;
164 fprintf (file, "\"L%011d$pb\"", current_pic_label_num);
167 /* The suffix attached to non-lazy pointer symbols. */
168 #define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr"
169 /* The suffix attached to stub symbols. */
170 #define STUB_SUFFIX "$stub"
172 typedef struct machopic_indirection GTY (())
174 /* The SYMBOL_REF for the entity referenced. */
176 /* The IDENTIFIER_NODE giving the name of the stub or non-lazy
179 /* True iff this entry is for a stub (as opposed to a non-lazy
182 /* True iff this stub or pointer pointer has been referenced. */
184 } machopic_indirection;
186 /* A table mapping stub names and non-lazy pointer names to
187 SYMBOL_REFs for the stubbed-to and pointed-to entities. */
189 static GTY ((param_is (struct machopic_indirection))) htab_t
190 machopic_indirections;
192 /* Return a hash value for a SLOT in the indirections hash table. */
195 machopic_indirection_hash (const void *slot)
197 const machopic_indirection *p = (const machopic_indirection *) slot;
198 return IDENTIFIER_HASH_VALUE (p->ptr_name);
201 /* Returns true if the KEY is the same as that associated with
205 machopic_indirection_eq (const void *slot, const void *key)
207 return ((const machopic_indirection *) slot)->ptr_name == (tree) key;
210 /* Return the name of the non-lazy pointer (if STUB_P is false) or
211 stub (if STUB_B is true) corresponding to the given name. */
214 machopic_indirection_name (rtx sym_ref, bool stub_p)
217 const char *name = XSTR (sym_ref, 0);
218 int namelen = strlen (name);
220 machopic_indirection *p;
222 /* Construct the name of the non-lazy pointer or stub. */
225 int needs_quotes = name_needs_quotes (name);
226 buffer = alloca (strlen ("&L")
228 + strlen (STUB_SUFFIX)
229 + 2 /* possible quotes */
235 sprintf (buffer, "&\"L%s" STUB_SUFFIX "\"", name + 1);
237 sprintf (buffer, "&\"L%s%s" STUB_SUFFIX "\"", user_label_prefix,
240 else if (name[0] == '*')
241 sprintf (buffer, "&L%s" STUB_SUFFIX, name + 1);
243 sprintf (buffer, "&L%s%s" STUB_SUFFIX, user_label_prefix, name);
247 buffer = alloca (strlen ("&L")
248 + strlen (user_label_prefix)
250 + strlen (NON_LAZY_POINTER_SUFFIX)
253 sprintf (buffer, "&L%s" NON_LAZY_POINTER_SUFFIX, name + 1);
255 sprintf (buffer, "&L%s%s" NON_LAZY_POINTER_SUFFIX,
256 user_label_prefix, name);
259 /* See if we already have it. */
260 ptr_name = maybe_get_identifier (buffer);
261 /* If not, create a mapping from the non-lazy pointer to the
266 ptr_name = get_identifier (buffer);
267 p = (machopic_indirection *) ggc_alloc (sizeof (machopic_indirection));
269 p->ptr_name = ptr_name;
272 if (!machopic_indirections)
273 machopic_indirections
274 = htab_create_ggc (37,
275 machopic_indirection_hash,
276 machopic_indirection_eq,
278 slot = htab_find_slot_with_hash (machopic_indirections, ptr_name,
279 IDENTIFIER_HASH_VALUE (ptr_name),
281 *((machopic_indirection **) slot) = p;
284 return IDENTIFIER_POINTER (ptr_name);
287 /* Return the name of the stub for the mcount function. */
290 machopic_mcount_stub_name (void)
292 return "&L*mcount$stub";
295 /* If NAME is the name of a stub or a non-lazy pointer , mark the stub
296 or non-lazy pointer as used -- and mark the object to which the
297 pointer/stub refers as used as well, since the pointer/stub will
298 emit a reference to it. */
301 machopic_validate_stub_or_non_lazy_ptr (const char *name)
303 tree ident = get_identifier (name);
305 machopic_indirection *p;
307 p = ((machopic_indirection *)
308 (htab_find_with_hash (machopic_indirections, ident,
309 IDENTIFIER_HASH_VALUE (ident))));
313 mark_referenced (ident);
314 mark_referenced (get_identifier (XSTR (p->symbol, 0)));
318 /* Transform ORIG, which may be any data source, to the corresponding
319 source using indirections. */
322 machopic_indirect_data_reference (rtx orig, rtx reg)
326 if (! MACHOPIC_INDIRECT)
329 if (GET_CODE (orig) == SYMBOL_REF)
331 int defined = machopic_data_defined_p (orig);
333 if (defined && MACHO_DYNAMIC_NO_PIC_P)
335 #if defined (TARGET_TOC)
336 emit_insn (gen_macho_high (reg, orig));
337 emit_insn (gen_macho_low (reg, reg, orig));
339 /* some other cpu -- writeme! */
346 #if defined (TARGET_TOC) || defined (HAVE_lo_sum)
347 rtx pic_base = machopic_function_base_sym ();
348 rtx offset = gen_rtx_CONST (Pmode,
349 gen_rtx_MINUS (Pmode, orig, pic_base));
352 #if defined (TARGET_TOC) /* i.e., PowerPC */
353 rtx hi_sum_reg = (no_new_pseudos ? reg : gen_reg_rtx (Pmode));
358 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
359 gen_rtx_PLUS (Pmode, pic_offset_table_rtx,
360 gen_rtx_HIGH (Pmode, offset))));
361 emit_insn (gen_rtx_SET (Pmode, reg,
362 gen_rtx_LO_SUM (Pmode, hi_sum_reg, offset)));
366 #if defined (HAVE_lo_sum)
367 if (reg == 0) abort ();
369 emit_insn (gen_rtx_SET (VOIDmode, reg,
370 gen_rtx_HIGH (Pmode, offset)));
371 emit_insn (gen_rtx_SET (VOIDmode, reg,
372 gen_rtx_LO_SUM (Pmode, reg, offset)));
373 emit_insn (gen_rtx_USE (VOIDmode, pic_offset_table_rtx));
375 orig = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, reg);
381 ptr_ref = (gen_rtx_SYMBOL_REF
383 machopic_indirection_name (orig, /*stub_p=*/false)));
385 SYMBOL_REF_DECL (ptr_ref) = SYMBOL_REF_DECL (orig);
387 ptr_ref = gen_rtx_MEM (Pmode, ptr_ref);
388 MEM_READONLY_P (ptr_ref) = 1;
392 else if (GET_CODE (orig) == CONST)
396 /* legitimize both operands of the PLUS */
397 if (GET_CODE (XEXP (orig, 0)) == PLUS)
399 base = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 0),
401 orig = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 1),
402 (base == reg ? 0 : reg));
407 if (MACHOPIC_PURE && GET_CODE (orig) == CONST_INT)
408 result = plus_constant (base, INTVAL (orig));
410 result = gen_rtx_PLUS (Pmode, base, orig);
412 if (MACHOPIC_JUST_INDIRECT && GET_CODE (base) == MEM)
416 emit_move_insn (reg, result);
421 result = force_reg (GET_MODE (result), result);
428 else if (GET_CODE (orig) == MEM)
429 XEXP (ptr_ref, 0) = machopic_indirect_data_reference (XEXP (orig, 0), reg);
430 /* When the target is i386, this code prevents crashes due to the
431 compiler's ignorance on how to move the PIC base register to
432 other registers. (The reload phase sometimes introduces such
434 else if (GET_CODE (orig) == PLUS
435 && GET_CODE (XEXP (orig, 0)) == REG
436 && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM
438 /* Prevent the same register from being erroneously used
439 as both the base and index registers. */
440 && GET_CODE (XEXP (orig, 1)) == CONST
444 emit_move_insn (reg, XEXP (orig, 0));
445 XEXP (ptr_ref, 0) = reg;
450 /* Transform TARGET (a MEM), which is a function call target, to the
451 corresponding symbol_stub if necessary. Return a new MEM. */
454 machopic_indirect_call_target (rtx target)
456 if (GET_CODE (target) != MEM)
459 if (MACHOPIC_INDIRECT
460 && GET_CODE (XEXP (target, 0)) == SYMBOL_REF
461 && !(SYMBOL_REF_FLAGS (XEXP (target, 0))
462 & MACHO_SYMBOL_FLAG_DEFINED))
464 rtx sym_ref = XEXP (target, 0);
465 const char *stub_name = machopic_indirection_name (sym_ref,
467 enum machine_mode mode = GET_MODE (sym_ref);
468 tree decl = SYMBOL_REF_DECL (sym_ref);
470 XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name);
471 SYMBOL_REF_DECL (XEXP (target, 0)) = decl;
472 MEM_READONLY_P (target) = 1;
479 machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg)
483 if (! MACHOPIC_INDIRECT)
486 /* First handle a simple SYMBOL_REF or LABEL_REF */
487 if (GET_CODE (orig) == LABEL_REF
488 || (GET_CODE (orig) == SYMBOL_REF
491 /* addr(foo) = &func+(foo-func) */
494 orig = machopic_indirect_data_reference (orig, reg);
496 if (GET_CODE (orig) == PLUS
497 && GET_CODE (XEXP (orig, 0)) == REG)
500 return force_reg (mode, orig);
502 emit_move_insn (reg, orig);
506 /* if dynamic-no-pic then use 0 as the pic base */
507 if (MACHO_DYNAMIC_NO_PIC_P)
508 pic_base = CONST0_RTX (Pmode);
510 pic_base = machopic_function_base_sym ();
512 if (GET_CODE (orig) == MEM)
516 if (reload_in_progress)
519 reg = gen_reg_rtx (Pmode);
523 if (MACHO_DYNAMIC_NO_PIC_P
524 && (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
525 || GET_CODE (XEXP (orig, 0)) == LABEL_REF))
527 #if defined (TARGET_TOC) /* ppc */
528 rtx temp_reg = (no_new_pseudos) ? reg : gen_reg_rtx (Pmode);
529 rtx asym = XEXP (orig, 0);
532 emit_insn (gen_macho_high (temp_reg, asym));
533 mem = gen_rtx_MEM (GET_MODE (orig),
534 gen_rtx_LO_SUM (Pmode, temp_reg, asym));
535 MEM_READONLY_P (mem) = 1;
536 emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
538 /* Some other CPU -- WriteMe! but right now there are no other platform that can use dynamic-no-pic */
544 if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
545 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
547 rtx offset = gen_rtx_CONST (Pmode,
548 gen_rtx_MINUS (Pmode,
551 #if defined (TARGET_TOC) /* i.e., PowerPC */
552 /* Generating a new reg may expose opportunities for
553 common subexpression elimination. */
554 rtx hi_sum_reg = no_new_pseudos ? reg : gen_reg_rtx (Pmode);
559 sum = gen_rtx_HIGH (Pmode, offset);
560 if (! MACHO_DYNAMIC_NO_PIC_P)
561 sum = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, sum);
563 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, sum));
565 mem = gen_rtx_MEM (GET_MODE (orig),
566 gen_rtx_LO_SUM (Pmode,
567 hi_sum_reg, offset));
568 MEM_READONLY_P (mem) = 1;
569 insn = emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
570 REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUAL, pic_ref,
575 emit_insn (gen_rtx_USE (VOIDmode,
577 PIC_OFFSET_TABLE_REGNUM)));
579 emit_insn (gen_rtx_SET (VOIDmode, reg,
581 gen_rtx_CONST (Pmode,
583 emit_insn (gen_rtx_SET (VOIDmode, reg,
584 gen_rtx_LO_SUM (Pmode, reg,
585 gen_rtx_CONST (Pmode, offset))));
586 pic_ref = gen_rtx_PLUS (Pmode,
587 pic_offset_table_rtx, reg);
591 #endif /* HAVE_lo_sum */
593 rtx pic = pic_offset_table_rtx;
594 if (GET_CODE (pic) != REG)
596 emit_move_insn (reg, pic);
600 emit_insn (gen_rtx_USE (VOIDmode,
602 PIC_OFFSET_TABLE_REGNUM)));
605 pic_ref = gen_rtx_PLUS (Pmode,
607 gen_rtx_CONST (Pmode,
608 gen_rtx_MINUS (Pmode,
613 #if !defined (TARGET_TOC)
614 emit_move_insn (reg, pic_ref);
615 pic_ref = gen_rtx_MEM (GET_MODE (orig), reg);
617 MEM_READONLY_P (pic_ref) = 1;
623 if (GET_CODE (orig) == SYMBOL_REF
624 || GET_CODE (orig) == LABEL_REF)
626 rtx offset = gen_rtx_CONST (Pmode,
627 gen_rtx_MINUS (Pmode,
629 #if defined (TARGET_TOC) /* i.e., PowerPC */
634 if (reload_in_progress)
637 reg = gen_reg_rtx (Pmode);
642 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
643 (MACHO_DYNAMIC_NO_PIC_P)
644 ? gen_rtx_HIGH (Pmode, offset)
645 : gen_rtx_PLUS (Pmode,
646 pic_offset_table_rtx,
649 emit_insn (gen_rtx_SET (VOIDmode, reg,
650 gen_rtx_LO_SUM (Pmode,
651 hi_sum_reg, offset)));
654 emit_insn (gen_rtx_SET (VOIDmode, reg,
655 gen_rtx_HIGH (Pmode, offset)));
656 emit_insn (gen_rtx_SET (VOIDmode, reg,
657 gen_rtx_LO_SUM (Pmode, reg, offset)));
658 pic_ref = gen_rtx_PLUS (Pmode,
659 pic_offset_table_rtx, reg);
663 #endif /* HAVE_lo_sum */
665 if (GET_CODE (orig) == REG)
671 rtx pic = pic_offset_table_rtx;
672 if (GET_CODE (pic) != REG)
674 emit_move_insn (reg, pic);
678 emit_insn (gen_rtx_USE (VOIDmode,
679 pic_offset_table_rtx));
681 pic_ref = gen_rtx_PLUS (Pmode,
683 gen_rtx_CONST (Pmode,
684 gen_rtx_MINUS (Pmode,
690 if (GET_CODE (pic_ref) != REG)
694 emit_move_insn (reg, pic_ref);
699 return force_reg (mode, pic_ref);
708 else if (GET_CODE (orig) == SYMBOL_REF)
711 else if (GET_CODE (orig) == PLUS
712 && (GET_CODE (XEXP (orig, 0)) == MEM
713 || GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
714 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
715 && XEXP (orig, 0) != pic_offset_table_rtx
716 && GET_CODE (XEXP (orig, 1)) != REG)
720 int is_complex = (GET_CODE (XEXP (orig, 0)) == MEM);
722 base = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
723 orig = machopic_legitimize_pic_address (XEXP (orig, 1),
724 Pmode, (base == reg ? 0 : reg));
725 if (GET_CODE (orig) == CONST_INT)
727 pic_ref = plus_constant (base, INTVAL (orig));
731 pic_ref = gen_rtx_PLUS (Pmode, base, orig);
733 if (reg && is_complex)
735 emit_move_insn (reg, pic_ref);
738 /* Likewise, should we set special REG_NOTEs here? */
741 else if (GET_CODE (orig) == CONST)
743 return machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
746 else if (GET_CODE (orig) == MEM
747 && GET_CODE (XEXP (orig, 0)) == SYMBOL_REF)
749 rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
750 addr = replace_equiv_address (orig, addr);
751 emit_move_insn (reg, addr);
758 /* Output the stub or non-lazy pointer in *SLOT, if it has been used.
759 DATA is the FILE* for assembly output. Called from
763 machopic_output_indirection (void **slot, void *data)
765 machopic_indirection *p = *((machopic_indirection **) slot);
766 FILE *asm_out_file = (FILE *) data;
768 const char *sym_name;
769 const char *ptr_name;
775 sym_name = XSTR (symbol, 0);
776 ptr_name = IDENTIFIER_POINTER (p->ptr_name);
783 sym = alloca (strlen (sym_name) + 2);
784 if (sym_name[0] == '*' || sym_name[0] == '&')
785 strcpy (sym, sym_name + 1);
786 else if (sym_name[0] == '-' || sym_name[0] == '+')
787 strcpy (sym, sym_name);
789 sprintf (sym, "%s%s", user_label_prefix, sym_name);
791 stub = alloca (strlen (ptr_name) + 2);
792 if (ptr_name[0] == '*' || ptr_name[0] == '&')
793 strcpy (stub, ptr_name + 1);
795 sprintf (stub, "%s%s", user_label_prefix, ptr_name);
797 machopic_output_stub (asm_out_file, sym, stub);
799 else if (machopic_symbol_defined_p (symbol))
802 assemble_align (GET_MODE_ALIGNMENT (Pmode));
803 assemble_label (ptr_name);
804 assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name),
805 GET_MODE_SIZE (Pmode),
806 GET_MODE_ALIGNMENT (Pmode), 1);
810 machopic_nl_symbol_ptr_section ();
811 assemble_name (asm_out_file, ptr_name);
812 fprintf (asm_out_file, ":\n");
814 fprintf (asm_out_file, "\t.indirect_symbol ");
815 assemble_name (asm_out_file, sym_name);
816 fprintf (asm_out_file, "\n");
818 assemble_integer (const0_rtx, GET_MODE_SIZE (Pmode),
819 GET_MODE_ALIGNMENT (Pmode), 1);
826 machopic_finish (FILE *asm_out_file)
828 if (machopic_indirections)
829 htab_traverse_noresize (machopic_indirections,
830 machopic_output_indirection,
835 machopic_operand_p (rtx op)
837 if (MACHOPIC_JUST_INDIRECT)
839 while (GET_CODE (op) == CONST)
842 if (GET_CODE (op) == SYMBOL_REF)
843 return machopic_symbol_defined_p (op);
848 while (GET_CODE (op) == CONST)
851 if (GET_CODE (op) == MINUS
852 && GET_CODE (XEXP (op, 0)) == SYMBOL_REF
853 && GET_CODE (XEXP (op, 1)) == SYMBOL_REF
854 && machopic_symbol_defined_p (XEXP (op, 0))
855 && machopic_symbol_defined_p (XEXP (op, 1)))
861 /* This function records whether a given name corresponds to a defined
862 or undefined function or variable, for machopic_classify_ident to
866 darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
870 /* Do the standard encoding things first. */
871 default_encode_section_info (decl, rtl, first);
873 if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
876 sym_ref = XEXP (rtl, 0);
877 if (TREE_CODE (decl) == VAR_DECL)
878 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE;
880 if (!DECL_EXTERNAL (decl)
881 && (!TREE_PUBLIC (decl) || (!DECL_ONE_ONLY (decl) && !DECL_WEAK (decl)))
882 && ((TREE_STATIC (decl)
883 && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl)))
884 || (!DECL_COMMON (decl) && DECL_INITIAL (decl)
885 && DECL_INITIAL (decl) != error_mark_node)))
886 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
890 darwin_make_decl_one_only (tree decl)
892 static const char *text_section = "__TEXT,__textcoal_nt,coalesced,no_toc";
893 static const char *data_section = "__DATA,__datacoal_nt,coalesced,no_toc";
895 const char *sec = TREE_CODE (decl) == FUNCTION_DECL
898 TREE_PUBLIC (decl) = 1;
899 DECL_ONE_ONLY (decl) = 1;
900 DECL_SECTION_NAME (decl) = build_string (strlen (sec), sec);
904 darwin_mark_decl_preserved (const char *name)
906 fprintf (asm_out_file, ".no_dead_strip ");
907 assemble_name (asm_out_file, name);
908 fputc ('\n', asm_out_file);
912 machopic_select_section (tree exp, int reloc,
913 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
915 void (*base_function)(void);
917 if (decl_readonly_section_1 (exp, reloc, MACHOPIC_INDIRECT))
918 base_function = readonly_data_section;
919 else if (TREE_READONLY (exp) || TREE_CONSTANT (exp))
920 base_function = const_data_section;
922 base_function = data_section;
924 if (TREE_CODE (exp) == STRING_CST
925 && ((size_t) TREE_STRING_LENGTH (exp)
926 == strlen (TREE_STRING_POINTER (exp)) + 1))
928 else if ((TREE_CODE (exp) == INTEGER_CST || TREE_CODE (exp) == REAL_CST)
929 && flag_merge_constants)
931 tree size = TYPE_SIZE (TREE_TYPE (exp));
933 if (TREE_CODE (size) == INTEGER_CST &&
934 TREE_INT_CST_LOW (size) == 4 &&
935 TREE_INT_CST_HIGH (size) == 0)
937 else if (TREE_CODE (size) == INTEGER_CST &&
938 TREE_INT_CST_LOW (size) == 8 &&
939 TREE_INT_CST_HIGH (size) == 0)
944 else if (TREE_CODE (exp) == CONSTRUCTOR
946 && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE
947 && TYPE_NAME (TREE_TYPE (exp)))
949 tree name = TYPE_NAME (TREE_TYPE (exp));
950 if (TREE_CODE (name) == TYPE_DECL)
951 name = DECL_NAME (name);
952 if (!strcmp (IDENTIFIER_POINTER (name), "NSConstantString"))
953 objc_constant_string_object_section ();
954 else if (!strcmp (IDENTIFIER_POINTER (name), "NXConstantString"))
955 objc_string_object_section ();
959 else if (TREE_CODE (exp) == VAR_DECL &&
961 TREE_CODE (DECL_NAME (exp)) == IDENTIFIER_NODE &&
962 IDENTIFIER_POINTER (DECL_NAME (exp)) &&
963 !strncmp (IDENTIFIER_POINTER (DECL_NAME (exp)), "_OBJC_", 6))
965 const char *name = IDENTIFIER_POINTER (DECL_NAME (exp));
967 if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20))
968 objc_cls_meth_section ();
969 else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23))
970 objc_inst_meth_section ();
971 else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 20))
972 objc_cat_cls_meth_section ();
973 else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 23))
974 objc_cat_inst_meth_section ();
975 else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22))
976 objc_class_vars_section ();
977 else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25))
978 objc_instance_vars_section ();
979 else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22))
980 objc_cat_cls_meth_section ();
981 else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17))
982 objc_class_names_section ();
983 else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20))
984 objc_meth_var_names_section ();
985 else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20))
986 objc_meth_var_types_section ();
987 else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22))
988 objc_cls_refs_section ();
989 else if (!strncmp (name, "_OBJC_CLASS_", 12))
990 objc_class_section ();
991 else if (!strncmp (name, "_OBJC_METACLASS_", 16))
992 objc_meta_class_section ();
993 else if (!strncmp (name, "_OBJC_CATEGORY_", 15))
994 objc_category_section ();
995 else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25))
996 objc_selector_refs_section ();
997 else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20))
998 objc_selector_fixup_section ();
999 else if (!strncmp (name, "_OBJC_SYMBOLS", 13))
1000 objc_symbols_section ();
1001 else if (!strncmp (name, "_OBJC_MODULES", 13))
1002 objc_module_info_section ();
1003 else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16))
1004 objc_image_info_section ();
1005 else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32))
1006 objc_cat_inst_meth_section ();
1007 else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29))
1008 objc_cat_cls_meth_section ();
1009 else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20))
1010 objc_cat_cls_meth_section ();
1011 else if (!strncmp (name, "_OBJC_PROTOCOL_", 15))
1012 objc_protocol_section ();
1020 /* This can be called with address expressions as "rtx".
1021 They must go in "const". */
1024 machopic_select_rtx_section (enum machine_mode mode, rtx x,
1025 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
1027 if (GET_MODE_SIZE (mode) == 8)
1028 literal8_section ();
1029 else if (GET_MODE_SIZE (mode) == 4
1030 && (GET_CODE (x) == CONST_INT
1031 || GET_CODE (x) == CONST_DOUBLE))
1032 literal4_section ();
1033 else if (MACHOPIC_INDIRECT
1034 && (GET_CODE (x) == SYMBOL_REF
1035 || GET_CODE (x) == CONST
1036 || GET_CODE (x) == LABEL_REF))
1037 const_data_section ();
1043 machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1045 if (MACHOPIC_INDIRECT)
1046 mod_init_section ();
1048 constructor_section ();
1049 assemble_align (POINTER_SIZE);
1050 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1052 if (! MACHOPIC_INDIRECT)
1053 fprintf (asm_out_file, ".reference .constructors_used\n");
1057 machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1059 if (MACHOPIC_INDIRECT)
1060 mod_term_section ();
1062 destructor_section ();
1063 assemble_align (POINTER_SIZE);
1064 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1066 if (! MACHOPIC_INDIRECT)
1067 fprintf (asm_out_file, ".reference .destructors_used\n");
1071 darwin_globalize_label (FILE *stream, const char *name)
1073 if (!!strncmp (name, "_OBJC_", 6))
1074 default_globalize_label (stream, name);
1078 darwin_asm_named_section (const char *name, unsigned int flags ATTRIBUTE_UNUSED)
1080 if (flag_reorder_blocks_and_partition)
1081 fprintf (asm_out_file, SECTION_FORMAT_STRING, name);
1083 fprintf (asm_out_file, ".section %s\n", name);
1087 darwin_section_type_flags (tree decl, const char *name, int reloc)
1089 unsigned int flags = default_section_type_flags (decl, name, reloc);
1091 /* Weak or linkonce variables live in a writable section. */
1092 if (decl != 0 && TREE_CODE (decl) != FUNCTION_DECL
1093 && (DECL_WEAK (decl) || DECL_ONE_ONLY (decl)))
1094 flags |= SECTION_WRITE;
1100 darwin_unique_section (tree decl, int reloc ATTRIBUTE_UNUSED)
1102 /* Darwin does not use unique sections. However, the target's
1103 unique_section hook is called for linkonce symbols. We need
1104 to set an appropriate section for such symbols. */
1105 if (DECL_ONE_ONLY (decl) && !DECL_SECTION_NAME (decl))
1106 darwin_make_decl_one_only (decl);
1109 #define HAVE_DEAD_STRIP 0
1112 no_dead_strip (FILE *file, const char *lab)
1114 if (HAVE_DEAD_STRIP)
1115 fprintf (file, ".no_dead_strip %s\n", lab);
1118 /* Emit a label for an FDE, making it global and/or weak if appropriate.
1119 The third parameter is nonzero if this is for exception handling.
1120 The fourth parameter is nonzero if this is just a placeholder for an
1121 FDE that we are omitting. */
1124 darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty)
1126 tree id = DECL_ASSEMBLER_NAME (decl)
1127 ? DECL_ASSEMBLER_NAME (decl)
1130 const char *prefix = "_";
1131 const int prefix_len = 1;
1133 const char *base = IDENTIFIER_POINTER (id);
1134 unsigned int base_len = IDENTIFIER_LENGTH (id);
1136 const char *suffix = ".eh";
1138 int need_quotes = name_needs_quotes (base);
1139 int quotes_len = need_quotes ? 2 : 0;
1145 lab = xmalloc (prefix_len + base_len + strlen (suffix) + quotes_len + 1);
1150 strcat(lab, prefix);
1152 strcat(lab, suffix);
1156 if (TREE_PUBLIC (decl))
1157 fprintf (file, "%s %s\n",
1158 (DECL_VISIBILITY (decl) != VISIBILITY_HIDDEN
1160 : ".private_extern"),
1163 if (DECL_ONE_ONLY (decl) && TREE_PUBLIC (decl))
1164 fprintf (file, ".weak_definition %s\n", lab);
1168 fprintf (file, "%s = 0\n", lab);
1170 /* Mark the absolute .eh and .eh1 style labels as needed to
1171 ensure that we don't dead code strip them and keep such
1172 labels from another instantiation point until we can fix this
1173 properly with group comdat support. */
1174 no_dead_strip (file, lab);
1177 fprintf (file, "%s:\n", lab);
1182 /* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */
1185 darwin_non_lazy_pcrel (FILE *file, rtx addr)
1187 const char *nlp_name;
1189 if (GET_CODE (addr) != SYMBOL_REF)
1192 nlp_name = machopic_indirection_name (addr, /*stub_p=*/false);
1193 fputs ("\t.long\t", file);
1194 ASM_OUTPUT_LABELREF (file, nlp_name);
1198 /* Emit an assembler directive to set visibility for a symbol. The
1199 only supported visibilities are VISIBILITY_DEFAULT and
1200 VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private
1201 extern". There is no MACH-O equivalent of ELF's
1202 VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */
1205 darwin_assemble_visibility (tree decl, int vis)
1207 if (vis == VISIBILITY_DEFAULT)
1209 else if (vis == VISIBILITY_HIDDEN)
1211 fputs ("\t.private_extern ", asm_out_file);
1212 assemble_name (asm_out_file,
1213 (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))));
1214 fputs ("\n", asm_out_file);
1217 warning ("internal and protected visibility attributes not supported"
1218 "in this configuration; ignored");
1221 /* Output a difference of two labels that will be an assembly time
1222 constant if the two labels are local. (.long lab1-lab2 will be
1223 very different if lab1 is at the boundary between two sections; it
1224 will be relocated according to the second section, not the first,
1225 so one ends up with a difference between labels in different
1226 sections, which is bad in the dwarf2 eh context for instance.) */
1228 static int darwin_dwarf_label_counter;
1231 darwin_asm_output_dwarf_delta (FILE *file, int size ATTRIBUTE_UNUSED,
1232 const char *lab1, const char *lab2)
1234 int islocaldiff = (lab1[0] == '*' && lab1[1] == 'L'
1235 && lab2[0] == '*' && lab2[1] == 'L');
1238 fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter);
1240 fprintf (file, "\t%s\t", ".long");
1241 assemble_name (file, lab1);
1242 fprintf (file, "-");
1243 assemble_name (file, lab2);
1245 fprintf (file, "\n\t.long L$set$%d", darwin_dwarf_label_counter++);
1249 darwin_file_end (void)
1251 machopic_finish (asm_out_file);
1252 if (strcmp (lang_hooks.name, "GNU C++") == 0)
1254 constructor_section ();
1255 destructor_section ();
1256 ASM_OUTPUT_ALIGN (asm_out_file, 1);
1260 #include "gt-darwin.h"