darwin.h revision 132718 
1/* Target definitions for x86 running Darwin.
2   Copyright (C) 2001, 2002 Free Software Foundation, Inc.
3   Contributed by Apple Computer Inc.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GCC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GCC; see the file COPYING.  If not, write to
19the Free Software Foundation, 59 Temple Place - Suite 330,
20Boston, MA 02111-1307, USA.  */
21
22/* Enable Mach-O bits in generic x86 code.  */
23#undef TARGET_MACHO
24#define TARGET_MACHO 1
25
26#define TARGET_VERSION fprintf (stderr, " (i386 Darwin)");
27
28#define TARGET_OS_CPP_BUILTINS()                \
29  do                                            \
30    {                                           \
31      builtin_define ("__i386__");              \
32      builtin_define ("__LITTLE_ENDIAN__");     \
33      builtin_define ("__MACH__");              \
34      builtin_define ("__APPLE__");             \
35    }                                           \
36  while (0)
37
38/* We want -fPIC by default, unless we're using -static to compile for
39   the kernel or some such.  */
40
41#undef CC1_SPEC
42#define CC1_SPEC "%{!static:-fPIC}"
43
44#define ASM_SPEC "-arch i386 \
45  %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL} \
46  %{!Zforce_cpusubtype_ALL:%{mmmx:-force_cpusubtype_ALL}\
47			   %{msse:-force_cpusubtype_ALL}\
48			   %{msse2:-force_cpusubtype_ALL}}"
49
50#undef SUBTARGET_EXTRA_SPECS
51#define SUBTARGET_EXTRA_SPECS			\
52  { "darwin_arch", "i386" },
53
54/* The Darwin assembler mostly follows AT&T syntax.  */
55#undef ASSEMBLER_DIALECT
56#define ASSEMBLER_DIALECT ASM_ATT
57
58/* Define macro used to output shift-double opcodes when the shift
59   count is in %cl.  Some assemblers require %cl as an argument;
60   some don't.  This macro controls what to do: by default, don't
61   print %cl.  */
62
63#define SHIFT_DOUBLE_OMITS_COUNT 0
64
65/* Define the syntax of pseudo-ops, labels and comments.  */
66
67/* String containing the assembler's comment-starter.  */
68
69#define ASM_COMMENT_START "#"
70
71/* By default, target has a 80387, uses IEEE compatible arithmetic,
72   and returns float values in the 387.  */
73
74#define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS)
75
76/* TARGET_DEEP_BRANCH_PREDICTION is incompatible with Mach-O PIC.  */
77
78#undef TARGET_DEEP_BRANCH_PREDICTION
79#define TARGET_DEEP_BRANCH_PREDICTION   0
80
81/* For now, disable dynamic-no-pic.  We'll need to go through i386.c
82   with a fine-tooth comb looking for refs to flag_pic!  */
83#define MASK_MACHO_DYNAMIC_NO_PIC 0
84#define TARGET_DYNAMIC_NO_PIC	  (target_flags & MASK_MACHO_DYNAMIC_NO_PIC)
85
86/* Define the syntax of pseudo-ops, labels and comments.  */
87
88#define LPREFIX "L"
89
90/* Assembler pseudos to introduce constants of various size.  */
91
92#define ASM_BYTE_OP "\t.byte\t"
93#define ASM_SHORT "\t.word\t"
94#define ASM_LONG "\t.long\t"
95/* Darwin as doesn't do ".quad".  */
96
97#undef ASM_OUTPUT_ALIGN
98#define ASM_OUTPUT_ALIGN(FILE,LOG)	\
99 do { if ((LOG) != 0)			\
100        {				\
101          if (in_text_section ())	\
102            fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
103          else				\
104            fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
105        }				\
106    } while (0)
107
108/* This says how to output an assembler line
109   to define a global common symbol.  */
110
111#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
112( fputs (".comm ", (FILE)),			\
113  assemble_name ((FILE), (NAME)),		\
114  fprintf ((FILE), ",%lu\n", (unsigned long)(ROUNDED)))
115
116/* This says how to output an assembler line
117   to define a local common symbol.  */
118
119#define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
120( fputs (".lcomm ", (FILE)),			\
121  assemble_name ((FILE), (NAME)),		\
122  fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (ROUNDED)))
123
124/* Darwin profiling -- call mcount.  */
125#undef FUNCTION_PROFILER
126#define FUNCTION_PROFILER(FILE, LABELNO)				\
127    do {								\
128      if (MACHOPIC_INDIRECT)						\
129	{								\
130	  const char *name = machopic_stub_name ("*mcount");		\
131	  fprintf (FILE, "\tcall %s\n", name+1);  /*  skip '&'  */	\
132	  machopic_validate_stub_or_non_lazy_ptr (name, /*stub:*/1);	\
133	}								\
134      else fprintf (FILE, "\tcall mcount\n");				\
135    } while (0)
136