gcc/config/i386/darwin.h

   1 /* Target definitions for x86 running Darwin.
   2    Copyright (C) 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2010
   3    Free Software Foundation, Inc.
   4    Contributed by Apple Computer Inc.
   5
   6 This file is part of GCC.
   7
   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 3, or (at your option)
  11 any later version.
  12
  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.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  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, " (i686 Darwin)");
  27
  28 #undef  TARGET_64BIT
  29 #define TARGET_64BIT OPTION_ISA_64BIT
  30
  31 #ifdef IN_LIBGCC2
  32 #undef TARGET_64BIT
  33 #ifdef __x86_64__
  34 #define TARGET_64BIT 1
  35 #else
  36 #define TARGET_64BIT 0
  37 #endif
  38 #endif
  39
  40 /* Size of the Obj-C jump buffer.  */
  41 #define OBJC_JBLEN ((TARGET_64BIT) ? ((9 * 2) + 3 + 16) : (18))
  42
  43 #undef TARGET_FPMATH_DEFAULT
  44 #define TARGET_FPMATH_DEFAULT (TARGET_SSE ? FPMATH_SSE : FPMATH_387)
  45
  46 #define TARGET_OS_CPP_BUILTINS()                \
  47   do                                            \
  48     {                                           \
  49       builtin_define ("__LITTLE_ENDIAN__");     \
  50       darwin_cpp_builtins (pfile);              \
  51     }                                           \
  52   while (0)
  53
  54 #undef PTRDIFF_TYPE
  55 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
  56
  57 #undef WCHAR_TYPE
  58 #define WCHAR_TYPE "int"
  59
  60 #undef WCHAR_TYPE_SIZE
  61 #define WCHAR_TYPE_SIZE 32
  62
  63 /* Generate branch islands stubs if this is true.  */
  64 extern int darwin_emit_branch_islands;
  65
  66 #undef TARGET_MACHO_BRANCH_ISLANDS
  67 #define TARGET_MACHO_BRANCH_ISLANDS darwin_emit_branch_islands
  68
  69 #undef MAX_BITS_PER_WORD
  70 #define MAX_BITS_PER_WORD 64
  71
  72 #undef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
  73 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN (0)
  74
  75 #undef TARGET_KEEPS_VECTOR_ALIGNED_STACK
  76 #define TARGET_KEEPS_VECTOR_ALIGNED_STACK 1
  77
  78 /* On Darwin, the stack is 128-bit aligned at the point of every call.
  79    Failure to ensure this will lead to a crash in the system libraries
  80    or dynamic loader.  */
  81 #undef STACK_BOUNDARY
  82 #define STACK_BOUNDARY \
  83  ((profile_flag || (TARGET_64BIT && ix86_abi == MS_ABI)) \
  84   ? 128 : BITS_PER_WORD)
  85
  86 #undef MAIN_STACK_BOUNDARY
  87 #define MAIN_STACK_BOUNDARY 128
  88
  89 /* Since we'll never want a stack boundary less aligned than 128 bits
  90    we need the extra work here otherwise bits of gcc get very grumpy
  91    when we ask for lower alignment.  We could just reject values less
  92    than 128 bits for Darwin, but it's easier to up the alignment if
  93    it's below the minimum.  */
  94 #undef PREFERRED_STACK_BOUNDARY
  95 #define PREFERRED_STACK_BOUNDARY                        \
  96   MAX (128, ix86_preferred_stack_boundary)
  97
  98 /* We want -fPIC by default, unless we're using -static to compile for
  99    the kernel or some such.  */
 100
 101 #undef CC1_SPEC
 102 #define CC1_SPEC "%(cc1_cpu) \
 103   %<mdynamic-no-pic " /* For now, we just ignore this flag */ " \
 104   %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \
 105   %{!mmacosx-version-min=*:-mmacosx-version-min=%(darwin_minversion)} \
 106   %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }}"
 107
 108 #undef ASM_SPEC
 109 #define ASM_SPEC "-arch %(darwin_arch) -force_cpusubtype_ALL"
 110
 111 #define DARWIN_ARCH_SPEC "%{m64:x86_64;:i386}"
 112 #define DARWIN_SUBARCH_SPEC DARWIN_ARCH_SPEC
 113
 114 /* Determine a minimum version based on compiler options.  */
 115 #define DARWIN_MINVERSION_SPEC                          \
 116  "%{!m64|fgnu-runtime:10.4;                             \
 117     ,objective-c|,objc-cpp-output:10.5;                 \
 118     ,objective-c-header:10.5;                           \
 119     ,objective-c++|,objective-c++-cpp-output:10.5;      \
 120     ,objective-c++-header|,objc++-cpp-output:10.5;      \
 121     :10.4}"
 122
 123 #undef ENDFILE_SPEC
 124 #define ENDFILE_SPEC \
 125   "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
 126    %{mpc32:crtprec32.o%s} \
 127    %{mpc64:crtprec64.o%s} \
 128    %{mpc80:crtprec80.o%s}"
 129
 130 #undef SUBTARGET_EXTRA_SPECS
 131 #define SUBTARGET_EXTRA_SPECS                                   \
 132   DARWIN_EXTRA_SPECS                                            \
 133   { "darwin_arch", DARWIN_ARCH_SPEC },                          \
 134   { "darwin_crt2", "" },                                        \
 135   { "darwin_subarch", DARWIN_SUBARCH_SPEC },
 136
 137 /* Use the following macro for any Darwin/x86-specific command-line option
 138    translation.  */
 139 #define SUBTARGET_OPTION_TRANSLATE_TABLE \
 140   { "", "" }
 141
 142 /* The Darwin assembler mostly follows AT&T syntax.  */
 143 #undef ASSEMBLER_DIALECT
 144 #define ASSEMBLER_DIALECT ASM_ATT
 145
 146 /* Define macro used to output shift-double opcodes when the shift
 147    count is in %cl.  Some assemblers require %cl as an argument;
 148    some don't.  This macro controls what to do: by default, don't
 149    print %cl.  */
 150
 151 #define SHIFT_DOUBLE_OMITS_COUNT 0
 152
 153 /* Put all *tf routines in libgcc.  */
 154 #undef LIBGCC2_HAS_TF_MODE
 155 #define LIBGCC2_HAS_TF_MODE 1
 156 #define LIBGCC2_TF_CEXT q
 157 #define TF_SIZE 113
 158
 159 #undef TARGET_ASM_FILE_END
 160 #define TARGET_ASM_FILE_END darwin_file_end
 161
 162 /* Define the syntax of pseudo-ops, labels and comments.  */
 163
 164 /* String containing the assembler's comment-starter.  */
 165
 166 #define ASM_COMMENT_START "#"
 167
 168 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 169    and returns float values in the 387.  */
 170
 171 #undef TARGET_SUBTARGET_DEFAULT
 172 #define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE)
 173
 174 /* For darwin we want to target specific processor features as a minimum,
 175    but these unfortunately don't correspond to a specific processor.  */
 176 #undef TARGET_SUBTARGET32_ISA_DEFAULT
 177 #define TARGET_SUBTARGET32_ISA_DEFAULT (OPTION_MASK_ISA_MMX             \
 178                                         | OPTION_MASK_ISA_SSE           \
 179                                         | OPTION_MASK_ISA_SSE2          \
 180                                         | OPTION_MASK_ISA_SSE3)
 181
 182 #undef TARGET_SUBTARGET64_ISA_DEFAULT
 183 #define TARGET_SUBTARGET64_ISA_DEFAULT TARGET_SUBTARGET32_ISA_DEFAULT
 184
 185 /* For now, disable dynamic-no-pic.  We'll need to go through i386.c
 186    with a fine-tooth comb looking for refs to flag_pic!  */
 187 #define MASK_MACHO_DYNAMIC_NO_PIC 0
 188 #define TARGET_DYNAMIC_NO_PIC     (target_flags & MASK_MACHO_DYNAMIC_NO_PIC)
 189
 190 #undef GOT_SYMBOL_NAME
 191 #define GOT_SYMBOL_NAME MACHOPIC_FUNCTION_BASE_NAME
 192
 193 /* Define the syntax of pseudo-ops, labels and comments.  */
 194
 195 #define LPREFIX "L"
 196
 197 /* These are used by -fbranch-probabilities */
 198 #define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
 199 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
 200                               "__TEXT,__unlikely,regular,pure_instructions"
 201
 202 /* Assembler pseudos to introduce constants of various size.  */
 203
 204 #define ASM_BYTE "\t.byte\t"
 205 #define ASM_SHORT "\t.word\t"
 206 #define ASM_LONG "\t.long\t"
 207 #define ASM_QUAD "\t.quad\t"
 208
 209 #define SUBTARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
 210
 211 #undef ASM_OUTPUT_ALIGN
 212 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 213  do { if ((LOG) != 0)                   \
 214         {                               \
 215           if (in_section == text_section) \
 216             fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
 217           else                          \
 218             fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
 219         }                               \
 220     } while (0)
 221
 222 /* This says how to output an assembler line
 223    to define a global common symbol.  */
 224
 225 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
 226 ( fputs ("\t.comm ", (FILE)),                   \
 227   assemble_name ((FILE), (NAME)),               \
 228   fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (ROUNDED)))
 229
 230 /* This says how to output an assembler line
 231    to define a local common symbol.  */
 232
 233 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
 234 ( fputs ("\t.lcomm ", (FILE)),                  \
 235   assemble_name ((FILE), (NAME)),               \
 236   fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (ROUNDED)))
 237
 238 /* Darwin profiling -- call mcount.  */
 239 #undef FUNCTION_PROFILER
 240 #define FUNCTION_PROFILER(FILE, LABELNO)                                \
 241     do {                                                                \
 242       if (TARGET_MACHO_BRANCH_ISLANDS && MACHOPIC_INDIRECT && !TARGET_64BIT)            \
 243         {                                                               \
 244           const char *name = machopic_mcount_stub_name ();              \
 245           fprintf (FILE, "\tcall %s\n", name+1);  /*  skip '&'  */      \
 246           machopic_validate_stub_or_non_lazy_ptr (name);                \
 247         }                                                               \
 248       else fprintf (FILE, "\tcall mcount\n");                           \
 249     } while (0)
 250
 251 #define C_COMMON_OVERRIDE_OPTIONS                                       \
 252   do {                                                                  \
 253     SUBTARGET_C_COMMON_OVERRIDE_OPTIONS;                                \
 254   } while (0)
 255
 256 /* Darwin on x86_64 uses dwarf-2 by default.  Pre-darwin9 32-bit
 257    compiles default to stabs+.  darwin9+ defaults to dwarf-2.  */
 258 #ifndef DARWIN_PREFER_DWARF
 259 #undef PREFERRED_DEBUGGING_TYPE
 260 #define PREFERRED_DEBUGGING_TYPE (TARGET_64BIT ? DWARF2_DEBUG : DBX_DEBUG)
 261 #endif
 262
 263 /* Darwin uses the standard DWARF register numbers but the default
 264    register numbers for STABS.  Fortunately for 64-bit code the
 265    default and the standard are the same.  */
 266 #undef DBX_REGISTER_NUMBER
 267 #define DBX_REGISTER_NUMBER(n)                                  \
 268   (TARGET_64BIT ? dbx64_register_map[n]                         \
 269    : write_symbols == DWARF2_DEBUG ? svr4_dbx_register_map[n]   \
 270    : dbx_register_map[n])
 271
 272 /* Unfortunately, the 32-bit EH information also doesn't use the standard
 273    DWARF register numbers.  */
 274 #define DWARF2_FRAME_REG_OUT(n, for_eh)                                 \
 275   (! (for_eh) || write_symbols != DWARF2_DEBUG || TARGET_64BIT ? (n)    \
 276    : (n) == 5 ? 4                                                       \
 277    : (n) == 4 ? 5                                                       \
 278    : (n) >= 11 && (n) <= 18 ? (n) + 1                                   \
 279    : (n))
 280
 281 #undef REGISTER_SUBTARGET_PRAGMAS
 282 #define REGISTER_SUBTARGET_PRAGMAS() DARWIN_REGISTER_TARGET_PRAGMAS()
 283
 284 #undef TARGET_SET_DEFAULT_TYPE_ATTRIBUTES
 285 #define TARGET_SET_DEFAULT_TYPE_ATTRIBUTES darwin_set_default_type_attributes
 286
 287 /* For 64-bit, we need to add 4 because @GOTPCREL is relative to the
 288    end of the instruction, but without the 4 we'd only have the right
 289    address for the start of the instruction.  */
 290 #undef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
 291 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE)     \
 292   if (TARGET_64BIT)                                                             \
 293     {                                                                           \
 294       if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_pcrel)                 \
 295         {                                                                       \
 296            fputs (ASM_LONG, FILE);                                              \
 297            assemble_name (FILE, XSTR (ADDR, 0));                                \
 298            fputs ("+4@GOTPCREL", FILE);                                         \
 299            goto DONE;                                                           \
 300         }                                                                       \
 301     }                                                                           \
 302   else                                                                          \
 303     {                                                                           \
 304       if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1))                      \
 305         {                                                                       \
 306           darwin_non_lazy_pcrel (FILE, ADDR);                                   \
 307           goto DONE;                                                            \
 308         }                                                                       \
 309     }
 310
 311 /* This needs to move since i386 uses the first flag and other flags are
 312    used in Mach-O.  */
 313 #undef MACHO_SYMBOL_FLAG_VARIABLE
 314 #define MACHO_SYMBOL_FLAG_VARIABLE ((SYMBOL_FLAG_MACH_DEP) << 3)
 315
 316 #define SUBTARGET32_DEFAULT_CPU "i686"