darwin.h revision 146895 
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/* Use the following macro for any Darwin/x86-specific command-line option
45   translation.  */
46#define SUBTARGET_OPTION_TRANSLATE_TABLE
47
48#define ASM_SPEC "-arch i386 \
49  %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL} \
50  %{!Zforce_cpusubtype_ALL:%{mmmx:-force_cpusubtype_ALL}\
51			   %{msse:-force_cpusubtype_ALL}\
52			   %{msse2:-force_cpusubtype_ALL}}"
53
54#undef SUBTARGET_EXTRA_SPECS
55#define SUBTARGET_EXTRA_SPECS			\
56  { "darwin_arch", "i386" },
57
58/* The Darwin assembler mostly follows AT&T syntax.  */
59#undef ASSEMBLER_DIALECT
60#define ASSEMBLER_DIALECT ASM_ATT
61
62/* Define macro used to output shift-double opcodes when the shift
63   count is in %cl.  Some assemblers require %cl as an argument;
64   some don't.  This macro controls what to do: by default, don't
65   print %cl.  */
66
67#define SHIFT_DOUBLE_OMITS_COUNT 0
68
69/* Define the syntax of pseudo-ops, labels and comments.  */
70
71/* String containing the assembler's comment-starter.  */
72
73#define ASM_COMMENT_START "#"
74
75/* By default, target has a 80387, uses IEEE compatible arithmetic,
76   and returns float values in the 387.  */
77
78#define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS)
79
80/* TARGET_DEEP_BRANCH_PREDICTION is incompatible with Mach-O PIC.  */
81
82#undef TARGET_DEEP_BRANCH_PREDICTION
83#define TARGET_DEEP_BRANCH_PREDICTION   0
84
85/* For now, disable dynamic-no-pic.  We'll need to go through i386.c
86   with a fine-tooth comb looking for refs to flag_pic!  */
87#define MASK_MACHO_DYNAMIC_NO_PIC 0
88#define TARGET_DYNAMIC_NO_PIC	  (target_flags & MASK_MACHO_DYNAMIC_NO_PIC)
89
90/* Define the syntax of pseudo-ops, labels and comments.  */
91
92#define LPREFIX "L"
93
94/* Assembler pseudos to introduce constants of various size.  */
95
96#define ASM_BYTE_OP "\t.byte\t"
97#define ASM_SHORT "\t.word\t"
98#define ASM_LONG "\t.long\t"
99/* Darwin as doesn't do ".quad".  */
100
101#undef ASM_OUTPUT_ALIGN
102#define ASM_OUTPUT_ALIGN(FILE,LOG)	\
103 do { if ((LOG) != 0)			\
104        {				\
105          if (in_text_section ())	\
106            fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
107          else				\
108            fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
109        }				\
110    } while (0)
111
112/* This says how to output an assembler line
113   to define a global common symbol.  */
114
115#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
116( fputs (".comm ", (FILE)),			\
117  assemble_name ((FILE), (NAME)),		\
118  fprintf ((FILE), ",%lu\n", (unsigned long)(ROUNDED)))
119
120/* This says how to output an assembler line
121   to define a local common symbol.  */
122
123#define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
124( fputs (".lcomm ", (FILE)),			\
125  assemble_name ((FILE), (NAME)),		\
126  fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (ROUNDED)))
127
128/* Darwin profiling -- call mcount.  */
129#undef FUNCTION_PROFILER
130#define FUNCTION_PROFILER(FILE, LABELNO)				\
131    do {								\
132      if (MACHOPIC_INDIRECT)						\
133	{								\
134	  const char *name = machopic_stub_name ("*mcount");		\
135	  fprintf (FILE, "\tcall %s\n", name+1);  /*  skip '&'  */	\
136	  machopic_validate_stub_or_non_lazy_ptr (name, /*stub:*/1);	\
137	}								\
138      else fprintf (FILE, "\tcall mcount\n");				\
139    } while (0)
140