darwin.h revision 117395 
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 GNU CC.
6
7GNU CC 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
12GNU CC 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 GNU CC; 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/* The Darwin assembler mostly follows AT&T syntax.  */
45#undef ASSEMBLER_DIALECT
46#define ASSEMBLER_DIALECT ASM_ATT
47
48/* Define macro used to output shift-double opcodes when the shift
49   count is in %cl.  Some assemblers require %cl as an argument;
50   some don't.  This macro controls what to do: by default, don't
51   print %cl.  */
52
53#define SHIFT_DOUBLE_OMITS_COUNT 0
54
55/* Define the syntax of pseudo-ops, labels and comments.  */
56
57/* String containing the assembler's comment-starter.  */
58
59#define ASM_COMMENT_START "#"
60
61/* By default, target has a 80387, uses IEEE compatible arithmetic,
62   and returns float values in the 387.  */
63
64#define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS)
65
66/* TARGET_DEEP_BRANCH_PREDICTION is incompatible with Mach-O PIC.  */
67
68#undef TARGET_DEEP_BRANCH_PREDICTION
69#define TARGET_DEEP_BRANCH_PREDICTION   0
70
71/* Define the syntax of pseudo-ops, labels and comments.  */
72
73#define LPREFIX "L"
74
75/* Assembler pseudos to introduce constants of various size.  */
76
77#define ASM_BYTE_OP "\t.byte\t"
78#define ASM_SHORT "\t.word\t"
79#define ASM_LONG "\t.long\t"
80/* Darwin as doesn't do ".quad".  */
81
82#undef ASM_OUTPUT_ALIGN
83#define ASM_OUTPUT_ALIGN(FILE,LOG)	\
84 do { if ((LOG) != 0)			\
85        {				\
86          if (in_text_section ())	\
87            fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
88          else				\
89            fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
90        }				\
91    } while (0)
92
93/* This says how to output an assembler line
94   to define a global common symbol.  */
95
96#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
97( fputs (".comm ", (FILE)),			\
98  assemble_name ((FILE), (NAME)),		\
99  fprintf ((FILE), ",%u\n", (ROUNDED)))
100
101/* This says how to output an assembler line
102   to define a local common symbol.  */
103
104#define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
105( fputs (".lcomm ", (FILE)),			\
106  assemble_name ((FILE), (NAME)),		\
107  fprintf ((FILE), ",%u\n", (ROUNDED)))
108
109/* Darwin profiling -- call mcount.  */
110#undef FUNCTION_PROFILER
111#define FUNCTION_PROFILER(FILE, LABELNO)				\
112    do {								\
113      if (MACHOPIC_INDIRECT)						\
114	{								\
115	  const char *name = machopic_stub_name ("*mcount");		\
116	  fprintf (FILE, "\tcall %s\n", name+1);  /*  skip '&'  */	\
117	  machopic_validate_stub_or_non_lazy_ptr (name, /*stub:*/1);	\
118	}								\
119      else fprintf (FILE, "\tcall mcount\n");				\
120    } while (0)
121