gcc/config/i386/darwin.h

   1 /* Target definitions for x86 running Darwin.
   2    Copyright (C) 2001-2015 Free Software Foundation, Inc.
   3    Contributed by Apple Computer Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 /* Enable Mach-O bits in generic x86 code.  */
  22 #undef TARGET_MACHO
  23 #define TARGET_MACHO 1
  24
  25 #undef DARWIN_X86
  26 #define DARWIN_X86 1
  27
  28 #undef  TARGET_64BIT
  29 #undef  TARGET_64BIT_P
  30 #define TARGET_64BIT TARGET_ISA_64BIT
  31 #define TARGET_64BIT_P(x) TARGET_ISA_64BIT_P(x)
  32
  33 #ifdef IN_LIBGCC2
  34 #undef TARGET_64BIT
  35 #ifdef __x86_64__
  36 #define TARGET_64BIT 1
  37 #else
  38 #define TARGET_64BIT 0
  39 #endif
  40 #endif
  41
  42 /* Size of the Obj-C jump buffer.  */
  43 #define OBJC_JBLEN ((TARGET_64BIT) ? ((9 * 2) + 3 + 16) : (18))
  44
  45 #undef TARGET_FPMATH_DEFAULT
  46 #define TARGET_FPMATH_DEFAULT (TARGET_SSE ? FPMATH_SSE : FPMATH_387)
  47
  48 #define TARGET_OS_CPP_BUILTINS()                \
  49   do                                            \
  50     {                                           \
  51       builtin_define ("__LITTLE_ENDIAN__");     \
  52       darwin_cpp_builtins (pfile);              \
  53     }                                           \
  54   while (0)
  55
  56 #undef PTRDIFF_TYPE
  57 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
  58
  59 #undef WCHAR_TYPE
  60 #define WCHAR_TYPE "int"
  61
  62 #undef WCHAR_TYPE_SIZE
  63 #define WCHAR_TYPE_SIZE 32
  64
  65 /* Generate branch islands stubs if this is true.  */
  66 extern int darwin_emit_branch_islands;
  67
  68 #undef TARGET_MACHO_BRANCH_ISLANDS
  69 #define TARGET_MACHO_BRANCH_ISLANDS darwin_emit_branch_islands
  70
  71 /* For compatibility with OSX system tools, use the new style of pic stub
  72    if this is set.  */
  73 #undef  MACHOPIC_ATT_STUB
  74 #define MACHOPIC_ATT_STUB (darwin_macho_att_stub)
  75
  76 #undef MAX_BITS_PER_WORD
  77 #define MAX_BITS_PER_WORD 64
  78
  79 #undef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
  80 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN (0)
  81
  82 #undef TARGET_KEEPS_VECTOR_ALIGNED_STACK
  83 #define TARGET_KEEPS_VECTOR_ALIGNED_STACK 1
  84
  85 /* On Darwin, the stack is 128-bit aligned at the point of every call.
  86    Failure to ensure this will lead to a crash in the system libraries
  87    or dynamic loader.  */
  88 #undef STACK_BOUNDARY
  89 #define STACK_BOUNDARY \
  90  ((profile_flag || (TARGET_64BIT && ix86_abi == MS_ABI)) \
  91   ? 128 : BITS_PER_WORD)
  92
  93 #undef MAIN_STACK_BOUNDARY
  94 #define MAIN_STACK_BOUNDARY 128
  95
  96 /* Since we'll never want a stack boundary less aligned than 128 bits
  97    we need the extra work here otherwise bits of gcc get very grumpy
  98    when we ask for lower alignment.  We could just reject values less
  99    than 128 bits for Darwin, but it's easier to up the alignment if
 100    it's below the minimum.  */
 101 #undef PREFERRED_STACK_BOUNDARY
 102 #define PREFERRED_STACK_BOUNDARY                        \
 103   MAX (128, ix86_preferred_stack_boundary)
 104
 105 /* We want -fPIC by default, unless we're using -static to compile for
 106    the kernel or some such.  */
 107
 108 #undef CC1_SPEC
 109 #define CC1_SPEC "%(cc1_cpu) \
 110   %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \
 111   %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} " \
 112   DARWIN_CC1_SPEC
 113
 114 #undef ASM_SPEC
 115 #define ASM_SPEC "-arch %(darwin_arch) -force_cpusubtype_ALL \
 116   %{static}"
 117
 118 #define DARWIN_ARCH_SPEC "%{m64:x86_64;:i386}"
 119 #define DARWIN_SUBARCH_SPEC DARWIN_ARCH_SPEC
 120
 121 #undef ENDFILE_SPEC
 122 #define ENDFILE_SPEC \
 123   "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
 124    %{mpc32:crtprec32.o%s} \
 125    %{mpc64:crtprec64.o%s} \
 126    %{mpc80:crtprec80.o%s}" TM_DESTRUCTOR
 127
 128 #undef SUBTARGET_EXTRA_SPECS
 129 #define SUBTARGET_EXTRA_SPECS                                   \
 130   DARWIN_EXTRA_SPECS                                            \
 131   { "darwin_arch", DARWIN_ARCH_SPEC },                          \
 132   { "darwin_crt2", "" },                                        \
 133   { "darwin_subarch", DARWIN_SUBARCH_SPEC },
 134
 135 /* The Darwin assembler mostly follows AT&T syntax.  */
 136 #undef ASSEMBLER_DIALECT
 137 #define ASSEMBLER_DIALECT ASM_ATT
 138
 139 /* Define macro used to output shift-double opcodes when the shift
 140    count is in %cl.  Some assemblers require %cl as an argument;
 141    some don't.  This macro controls what to do: by default, don't
 142    print %cl.  */
 143
 144 #define SHIFT_DOUBLE_OMITS_COUNT 0
 145
 146 #undef TARGET_ASM_FILE_END
 147 #define TARGET_ASM_FILE_END darwin_file_end
 148
 149 /* Define the syntax of pseudo-ops, labels and comments.  */
 150
 151 /* String containing the assembler's comment-starter.  */
 152
 153 #define ASM_COMMENT_START "#"
 154
 155 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 156    and returns float values in the 387.  */
 157
 158 #undef TARGET_SUBTARGET_DEFAULT
 159 #define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE)
 160
 161 /* For darwin we want to target specific processor features as a minimum,
 162    but these unfortunately don't correspond to a specific processor.  */
 163 #undef TARGET_SUBTARGET32_ISA_DEFAULT
 164 #define TARGET_SUBTARGET32_ISA_DEFAULT (OPTION_MASK_ISA_MMX             \
 165                                         | OPTION_MASK_ISA_SSE           \
 166                                         | OPTION_MASK_ISA_SSE2          \
 167                                         | OPTION_MASK_ISA_SSE3)
 168
 169 #undef TARGET_SUBTARGET64_ISA_DEFAULT
 170 #define TARGET_SUBTARGET64_ISA_DEFAULT TARGET_SUBTARGET32_ISA_DEFAULT
 171
 172 #undef GOT_SYMBOL_NAME
 173 #define GOT_SYMBOL_NAME MACHOPIC_FUNCTION_BASE_NAME
 174
 175 /* Define the syntax of pseudo-ops, labels and comments.  */
 176
 177 #define LPREFIX "L"
 178
 179 /* Assembler pseudos to introduce constants of various size.  */
 180
 181 #define ASM_BYTE "\t.byte\t"
 182 #define ASM_SHORT "\t.word\t"
 183 #define ASM_LONG "\t.long\t"
 184 #define ASM_QUAD "\t.quad\t"
 185
 186 #define SUBTARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
 187
 188 #undef ASM_OUTPUT_ALIGN
 189 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 190  do { if ((LOG) != 0)                   \
 191         {                               \
 192           if (in_section == text_section) \
 193             fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
 194           else                          \
 195             fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
 196         }                               \
 197     } while (0)
 198
 199 /* Darwin profiling -- call mcount.  */
 200 #undef FUNCTION_PROFILER
 201 #define FUNCTION_PROFILER(FILE, LABELNO)                                \
 202     do {                                                                \
 203       if (TARGET_MACHO_BRANCH_ISLANDS                                   \
 204            && MACHOPIC_INDIRECT && !TARGET_64BIT)                       \
 205         {                                                               \
 206           const char *name = machopic_mcount_stub_name ();              \
 207           fprintf (FILE, "\tcall %s\n", name+1);  /*  skip '&'  */      \
 208           machopic_validate_stub_or_non_lazy_ptr (name);                \
 209         }                                                               \
 210       else fprintf (FILE, "\tcall mcount\n");                           \
 211     } while (0)
 212
 213 #define C_COMMON_OVERRIDE_OPTIONS                                       \
 214   do {                                                                  \
 215     SUBTARGET_C_COMMON_OVERRIDE_OPTIONS;                                \
 216   } while (0)
 217
 218 #undef SUBTARGET_OVERRIDE_OPTIONS
 219 #define SUBTARGET_OVERRIDE_OPTIONS \
 220 do {                                                                    \
 221   if (TARGET_64BIT && MACHO_DYNAMIC_NO_PIC_P)                           \
 222     target_flags &= ~MASK_MACHO_DYNAMIC_NO_PIC;                         \
 223 } while (0)
 224
 225 /* Darwin on x86_64 uses dwarf-2 by default.  Pre-darwin9 32-bit
 226    compiles default to stabs+.  darwin9+ defaults to dwarf-2.  */
 227 #ifndef DARWIN_PREFER_DWARF
 228 #undef PREFERRED_DEBUGGING_TYPE
 229 #define PREFERRED_DEBUGGING_TYPE (TARGET_64BIT ? DWARF2_DEBUG : DBX_DEBUG)
 230 #endif
 231
 232 /* Darwin uses the standard DWARF register numbers but the default
 233    register numbers for STABS.  Fortunately for 64-bit code the
 234    default and the standard are the same.  */
 235 #undef DBX_REGISTER_NUMBER
 236 #define DBX_REGISTER_NUMBER(n)                                  \
 237   (TARGET_64BIT ? dbx64_register_map[n]                         \
 238    : write_symbols == DWARF2_DEBUG ? svr4_dbx_register_map[n]   \
 239    : dbx_register_map[n])
 240
 241 /* Unfortunately, the 32-bit EH information also doesn't use the standard
 242    DWARF register numbers.  */
 243 #define DWARF2_FRAME_REG_OUT(n, for_eh)                                 \
 244   (! (for_eh) || write_symbols != DWARF2_DEBUG || TARGET_64BIT ? (n)    \
 245    : (n) == 5 ? 4                                                       \
 246    : (n) == 4 ? 5                                                       \
 247    : (n) >= 11 && (n) <= 18 ? (n) + 1                                   \
 248    : (n))
 249
 250 #undef REGISTER_SUBTARGET_PRAGMAS
 251 #define REGISTER_SUBTARGET_PRAGMAS() DARWIN_REGISTER_TARGET_PRAGMAS()
 252
 253 #undef TARGET_SET_DEFAULT_TYPE_ATTRIBUTES
 254 #define TARGET_SET_DEFAULT_TYPE_ATTRIBUTES darwin_set_default_type_attributes
 255
 256 /* For 64-bit, we need to add 4 because @GOTPCREL is relative to the
 257    end of the instruction, but without the 4 we'd only have the right
 258    address for the start of the instruction.  */
 259 #undef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
 260 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE)     \
 261   if (TARGET_64BIT)                                                             \
 262     {                                                                           \
 263       if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_pcrel)                 \
 264         {                                                                       \
 265            fputs (ASM_LONG, FILE);                                              \
 266            assemble_name (FILE, XSTR (ADDR, 0));                                \
 267            fputs ("+4@GOTPCREL", FILE);                                         \
 268            goto DONE;                                                           \
 269         }                                                                       \
 270     }                                                                           \
 271   else                                                                          \
 272     {                                                                           \
 273       if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1))                      \
 274         {                                                                       \
 275           darwin_non_lazy_pcrel (FILE, ADDR);                                   \
 276           goto DONE;                                                            \
 277         }                                                                       \
 278     }
 279
 280 /* This needs to move since i386 uses the first flag and other flags are
 281    used in Mach-O.  */
 282 #undef MACHO_SYMBOL_FLAG_VARIABLE
 283 #define MACHO_SYMBOL_FLAG_VARIABLE ((SYMBOL_FLAG_MACH_DEP) << 3)
 284
 285 #undef MACHOPIC_NL_SYMBOL_PTR_SECTION
 286 #define MACHOPIC_NL_SYMBOL_PTR_SECTION \
 287                 ".section __IMPORT,__pointers,non_lazy_symbol_pointers"
 288
 289 #define SUBTARGET32_DEFAULT_CPU "i686"
 290
 291 #undef  SUBTARGET_INIT_BUILTINS
 292 #define SUBTARGET_INIT_BUILTINS                                 \
 293 do {                                                            \
 294   ix86_builtins[(int) IX86_BUILTIN_CFSTRING]                    \
 295     = darwin_init_cfstring_builtins ((unsigned) (IX86_BUILTIN_CFSTRING));       \
 296   darwin_rename_builtins ();                                    \
 297 } while(0)