gcc/config/i386/cygming.h

   1 /* Operating system specific defines to be used when targeting GCC for
   2    hosting on Windows32, using a Unix style C library and tools.
   3    Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   4    2004, 2005, 2007, 2008, 2009
   5    Free Software Foundation, Inc.
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 3, or (at your option)
  12 any later version.
  13
  14 GCC is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING3.  If not see
  21 <http://www.gnu.org/licenses/>.  */
  22
  23 #define DBX_DEBUGGING_INFO 1
  24 #define SDB_DEBUGGING_INFO 1
  25 #if TARGET_64BIT_DEFAULT || defined (HAVE_GAS_PE_SECREL32_RELOC)
  26 #define DWARF2_DEBUGGING_INFO 1
  27 #endif
  28
  29 #undef PREFERRED_DEBUGGING_TYPE
  30 #if (DWARF2_DEBUGGING_INFO)
  31 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
  32 #else
  33 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
  34 #endif
  35
  36 #undef TARGET_64BIT_MS_ABI
  37 #define TARGET_64BIT_MS_ABI (!cfun ? ix86_abi == MS_ABI : TARGET_64BIT && cfun->machine->call_abi == MS_ABI)
  38
  39 #undef DEFAULT_ABI
  40 #define DEFAULT_ABI (TARGET_64BIT ? MS_ABI : SYSV_ABI)
  41
  42 #undef DBX_REGISTER_NUMBER
  43 #define DBX_REGISTER_NUMBER(n)                          \
  44   (TARGET_64BIT ? dbx64_register_map[n]                 \
  45    : (write_symbols == DWARF2_DEBUG                     \
  46       ? svr4_dbx_register_map[n] : dbx_register_map[n]))
  47
  48 /* Map gcc register number to DWARF 2 CFA column number. For 32 bit
  49    target, always use the svr4_dbx_register_map for DWARF .eh_frame
  50    even if we don't use DWARF .debug_frame. */
  51 #undef DWARF_FRAME_REGNUM
  52 #define DWARF_FRAME_REGNUM(n) TARGET_64BIT \
  53         ? dbx64_register_map[(n)] : svr4_dbx_register_map[(n)]
  54
  55 #ifdef HAVE_GAS_PE_SECREL32_RELOC
  56 /* Use section relative relocations for debugging offsets.  Unlike
  57    other targets that fake this by putting the section VMA at 0, PE
  58    won't allow it.  */
  59 #define ASM_OUTPUT_DWARF_OFFSET(FILE, SIZE, LABEL, SECTION)     \
  60   do {                                                          \
  61     if (SIZE != 4 && (!TARGET_64BIT || SIZE != 8))              \
  62       abort ();                                                 \
  63                                                                 \
  64     fputs ("\t.secrel32\t", FILE);                              \
  65     assemble_name (FILE, LABEL);                                \
  66   } while (0)
  67 #endif
  68
  69 #define TARGET_EXECUTABLE_SUFFIX ".exe"
  70
  71 #include <stdio.h>
  72
  73 #define TARGET_OS_CPP_BUILTINS()                                        \
  74   do                                                                    \
  75     {                                                                   \
  76         if (!TARGET_64BIT)                                              \
  77           builtin_define ("_X86_=1");                                   \
  78         builtin_assert ("system=winnt");                                \
  79         builtin_define ("__stdcall=__attribute__((__stdcall__))");      \
  80         builtin_define ("__fastcall=__attribute__((__fastcall__))");    \
  81         builtin_define ("__cdecl=__attribute__((__cdecl__))");          \
  82         if (!flag_iso)                                                  \
  83           {                                                             \
  84             builtin_define ("_stdcall=__attribute__((__stdcall__))");   \
  85             builtin_define ("_fastcall=__attribute__((__fastcall__))"); \
  86             builtin_define ("_cdecl=__attribute__((__cdecl__))");       \
  87           }                                                             \
  88         /* Even though linkonce works with static libs, this is needed  \
  89             to compare typeinfo symbols across dll boundaries.  */      \
  90         builtin_define ("__GXX_MERGED_TYPEINFO_NAMES=0");               \
  91         builtin_define ("__GXX_TYPEINFO_EQUALITY_INLINE=0");            \
  92         EXTRA_OS_CPP_BUILTINS ();                                       \
  93   }                                                                     \
  94   while (0)
  95
  96 /* Get tree.c to declare a target-specific specialization of
  97    merge_decl_attributes.  */
  98 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 1
  99
 100 /* This macro defines names of additional specifications to put in the specs
 101    that can be used in various specifications like CC1_SPEC.  Its definition
 102    is an initializer with a subgrouping for each command option.
 103
 104    Each subgrouping contains a string constant, that defines the
 105    specification name, and a string constant that used by the GCC driver
 106    program.
 107
 108    Do not define this macro if it does not need to do anything.  */
 109
 110 #undef  SUBTARGET_EXTRA_SPECS
 111 #define SUBTARGET_EXTRA_SPECS                                           \
 112   { "mingw_include_path", DEFAULT_TARGET_MACHINE }
 113
 114 #undef MATH_LIBRARY
 115 #define MATH_LIBRARY ""
 116
 117 #define SIZE_TYPE (TARGET_64BIT ? "long long unsigned int" : "unsigned int")
 118 #define PTRDIFF_TYPE (TARGET_64BIT ? "long long int" : "int")
 119
 120 #define WCHAR_TYPE_SIZE 16
 121 #define WCHAR_TYPE "short unsigned int"
 122
 123 /* Windows64 continues to use a 32-bit long type.  */
 124 #undef LONG_TYPE_SIZE
 125 #define LONG_TYPE_SIZE 32
 126 \f
 127 /* Enable parsing of #pragma pack(push,<n>) and #pragma pack(pop).  */
 128 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
 129 /* Enable push_macro & pop_macro */
 130 #define HANDLE_PRAGMA_PUSH_POP_MACRO 1
 131
 132 union tree_node;
 133 #define TREE union tree_node *
 134 \f
 135 #define drectve_section() \
 136   (fprintf (asm_out_file, "\t.section .drectve\n"), \
 137    in_section = NULL)
 138
 139 /* Older versions of gas don't handle 'r' as data.
 140    Explicitly set data flag with 'd'.  */
 141 #define READONLY_DATA_SECTION_ASM_OP "\t.section .rdata,\"dr\""
 142
 143 /* Don't allow flag_pic to propagate since gas may produce invalid code
 144    otherwise.  */
 145
 146 #undef  SUBTARGET_OVERRIDE_OPTIONS
 147 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 148 do {                                                                    \
 149   if (flag_pic)                                                         \
 150     {                                                                   \
 151       warning (0, "-f%s ignored for target (all code is position independent)",\
 152                (flag_pic > 1) ? "PIC" : "pic");                         \
 153       flag_pic = 0;                                                     \
 154     }                                                                   \
 155 } while (0)                                                             \
 156
 157 /* Define this macro if references to a symbol must be treated
 158    differently depending on something about the variable or
 159    function named by the symbol (such as what section it is in).
 160
 161    On i386 running Windows NT, modify the assembler name with a suffix
 162    consisting of an atsign (@) followed by string of digits that represents
 163    the number of bytes of arguments passed to the function, if it has the
 164    attribute STDCALL.
 165
 166    In addition, we must mark dll symbols specially. Definitions of
 167    dllexport'd objects install some info in the .drectve section.
 168    References to dllimport'd objects are fetched indirectly via
 169    _imp__.  If both are declared, dllexport overrides.  This is also
 170    needed to implement one-only vtables: they go into their own
 171    section and we need to set DECL_SECTION_NAME so we do that here.
 172    Note that we can be called twice on the same decl.  */
 173
 174 #define SUBTARGET_ENCODE_SECTION_INFO  i386_pe_encode_section_info
 175
 176 /* Output a common block.  */
 177 #undef ASM_OUTPUT_ALIGNED_DECL_COMMON
 178 #define ASM_OUTPUT_ALIGNED_DECL_COMMON \
 179   i386_pe_asm_output_aligned_decl_common
 180
 181 /* Output the label for an initialized variable.  */
 182 #undef ASM_DECLARE_OBJECT_NAME
 183 #define ASM_DECLARE_OBJECT_NAME(STREAM, NAME, DECL)     \
 184 do {                                                    \
 185   i386_pe_maybe_record_exported_symbol (DECL, NAME, 1); \
 186   ASM_OUTPUT_LABEL ((STREAM), (NAME));                  \
 187 } while (0)
 188
 189 /* Output a reference to a label. Fastcall function symbols
 190    keep their '@' prefix, while other symbols are prefixed
 191    with user_label_prefix.  */
 192 #undef ASM_OUTPUT_LABELREF
 193 #define  ASM_OUTPUT_LABELREF(STREAM, NAME)      \
 194 do {                                            \
 195   if ((NAME)[0] != FASTCALL_PREFIX)             \
 196     fputs (user_label_prefix, (STREAM));        \
 197   fputs ((NAME), (STREAM));                     \
 198 } while (0)
 199
 200 \f
 201 /* Emit code to check the stack when allocating more than 4000
 202    bytes in one go.  */
 203 #define CHECK_STACK_LIMIT 4000
 204
 205 #undef STACK_BOUNDARY
 206 #define STACK_BOUNDARY  (ix86_abi == MS_ABI ? 128 : BITS_PER_WORD)
 207
 208 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 209    returns float values in the 387 and needs stack probes.
 210    We also align doubles to 64-bits for MSVC default compatibility.  */
 211
 212 #undef TARGET_SUBTARGET_DEFAULT
 213 #define TARGET_SUBTARGET_DEFAULT \
 214         (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS \
 215          | MASK_STACK_PROBE | MASK_ALIGN_DOUBLE)
 216
 217 #undef TARGET_SUBTARGET64_DEFAULT
 218 #define TARGET_SUBTARGET64_DEFAULT \
 219         MASK_128BIT_LONG_DOUBLE
 220
 221 /* This is how to output an assembler line
 222    that says to advance the location counter
 223    to a multiple of 2**LOG bytes.  */
 224
 225 #undef ASM_OUTPUT_ALIGN
 226 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 227     if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
 228
 229 /* Windows uses explicit import from shared libraries.  */
 230 #define MULTIPLE_SYMBOL_SPACES 1
 231
 232 #define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section
 233 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 234
 235 #define SUPPORTS_ONE_ONLY 1
 236
 237 /* Switch into a generic section.  */
 238 #define TARGET_ASM_NAMED_SECTION  i386_pe_asm_named_section
 239
 240 /* Select attributes for named sections.  */
 241 #define TARGET_SECTION_TYPE_FLAGS  i386_pe_section_type_flags
 242
 243 /* Write the extra assembler code needed to declare a function
 244    properly.  If we are generating SDB debugging information, this
 245    will happen automatically, so we only need to handle other cases.  */
 246 #undef ASM_DECLARE_FUNCTION_NAME
 247 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 248   do                                                                    \
 249     {                                                                   \
 250       i386_pe_maybe_record_exported_symbol (DECL, NAME, 0);             \
 251       if (write_symbols != SDB_DEBUG)                                   \
 252         i386_pe_declare_function_type (FILE, NAME, TREE_PUBLIC (DECL)); \
 253       ASM_OUTPUT_LABEL (FILE, NAME);                                    \
 254     }                                                                   \
 255   while (0)
 256
 257 /* Add an external function to the list of functions to be declared at
 258    the end of the file.  */
 259 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 260   do                                                                    \
 261     {                                                                   \
 262       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 263         i386_pe_record_external_function ((DECL), (NAME));              \
 264     }                                                                   \
 265   while (0)
 266
 267 /* Declare the type properly for any external libcall.  */
 268 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
 269   i386_pe_declare_function_type (FILE, XSTR (FUN, 0), 1)
 270
 271 /* This says out to put a global symbol in the BSS section.  */
 272 #undef ASM_OUTPUT_ALIGNED_BSS
 273 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 274   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 275
 276 /* Output function declarations at the end of the file.  */
 277 #undef TARGET_ASM_FILE_END
 278 #define TARGET_ASM_FILE_END i386_pe_file_end
 279
 280 #undef ASM_COMMENT_START
 281 #define ASM_COMMENT_START " #"
 282
 283 #ifndef DWARF2_UNWIND_INFO
 284 /* If configured with --disable-sjlj-exceptions, use DWARF2, else
 285    default to SJLJ.  */
 286 #if  (defined (CONFIG_SJLJ_EXCEPTIONS) && !CONFIG_SJLJ_EXCEPTIONS)
 287 /* The logic of this #if must be kept synchronised with the logic
 288    for selecting the tmake_eh_file fragment in config.gcc.  */
 289 #define DWARF2_UNWIND_INFO 1
 290 /* If multilib is selected break build as sjlj is required.  */
 291 #if defined (TARGET_BI_ARCH)
 292 #error For 64-bit windows and 32-bit based multilib version of gcc just SJLJ exceptions are supported.
 293 #endif
 294 #else
 295 #define DWARF2_UNWIND_INFO 0
 296 #endif
 297 #endif
 298
 299 /* Don't assume anything about the header files.  */
 300 #define NO_IMPLICIT_EXTERN_C
 301
 302 #undef PROFILE_HOOK
 303 #define PROFILE_HOOK(LABEL)                                             \
 304   if (MAIN_NAME_P (DECL_NAME (current_function_decl)))                  \
 305     {                                                                   \
 306       emit_call_insn (gen_rtx_CALL (VOIDmode,                           \
 307         gen_rtx_MEM (FUNCTION_MODE,                                     \
 308                      gen_rtx_SYMBOL_REF (Pmode, "_monstartup")),        \
 309         const0_rtx));                                                   \
 310     }
 311
 312 /* Java Native Interface (JNI) methods on Win32 are invoked using the
 313    stdcall calling convention.  */
 314 #undef MODIFY_JNI_METHOD_CALL
 315 #define MODIFY_JNI_METHOD_CALL(MDECL)                                         \
 316   build_type_attribute_variant ((MDECL),                                      \
 317                                build_tree_list (get_identifier ("stdcall"),   \
 318                                                 NULL))
 319
 320 /* For Win32 ABI compatibility */
 321 #undef DEFAULT_PCC_STRUCT_RETURN
 322 #define DEFAULT_PCC_STRUCT_RETURN 0
 323
 324 /* MSVC returns aggregate types of up to 8 bytes via registers.
 325    See i386.c:ix86_return_in_memory.  */
 326 #undef MS_AGGREGATE_RETURN
 327 #define MS_AGGREGATE_RETURN 1
 328
 329 /* Biggest alignment supported by the object file format of this
 330    machine.  Use this macro to limit the alignment which can be
 331    specified using the `__attribute__ ((aligned (N)))' construct.  If
 332    not defined, the default value is `BIGGEST_ALIGNMENT'.  */
 333 /* IMAGE_SCN_ALIGN_8192BYTES is the largest section alignment flag
 334    specified in the PECOFF60 spec.  Native MS compiler also limits
 335    user-specified alignment to 8192 bytes.  */
 336 #undef MAX_OFILE_ALIGNMENT
 337 #define MAX_OFILE_ALIGNMENT (8192 * 8)
 338
 339 /* BIGGEST_FIELD_ALIGNMENT macro is used directly by libobjc, There, we
 340    align internal doubles in structures on dword boundaries. Otherwise,
 341    support vector modes using ADJUST_FIELD_ALIGN, defined in i386.h.  */
 342 #ifdef IN_TARGET_LIBS
 343 #undef  BIGGEST_FIELD_ALIGNMENT
 344 #define BIGGEST_FIELD_ALIGNMENT 64
 345 #endif
 346
 347 /* A bit-field declared as `int' forces `int' alignment for the struct.  */
 348 #undef PCC_BITFIELD_TYPE_MATTERS
 349 #define PCC_BITFIELD_TYPE_MATTERS 1
 350 #define GROUP_BITFIELDS_BY_ALIGN TYPE_NATIVE(rec)
 351
 352 /* Enable alias attribute support.  */
 353 #ifndef SET_ASM_OP
 354 #define SET_ASM_OP "\t.set\t"
 355 #endif
 356
 357 /* This implements the `alias' attribute, keeping any stdcall or
 358    fastcall decoration.  */
 359 #undef  ASM_OUTPUT_DEF_FROM_DECLS
 360 #define ASM_OUTPUT_DEF_FROM_DECLS(STREAM, DECL, TARGET)                 \
 361   do                                                                    \
 362     {                                                                   \
 363       const char *alias                                                 \
 364         = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));              \
 365       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 366         i386_pe_declare_function_type (STREAM, alias,                   \
 367                                        TREE_PUBLIC (DECL));             \
 368       ASM_OUTPUT_DEF (STREAM, alias, IDENTIFIER_POINTER (TARGET));      \
 369     } while (0)
 370
 371 /* GNU as supports weak symbols on PECOFF. */
 372 #ifdef HAVE_GAS_WEAK
 373 #define ASM_WEAKEN_LABEL(FILE, NAME)  \
 374   do                                  \
 375     {                                 \
 376       fputs ("\t.weak\t", (FILE));    \
 377       assemble_name ((FILE), (NAME)); \
 378       fputc ('\n', (FILE));           \
 379     }                                 \
 380   while (0)
 381 #endif /* HAVE_GAS_WEAK */
 382
 383 /* FIXME: SUPPORTS_WEAK && TARGET_HAVE_NAMED_SECTIONS is true,
 384    but for .jcr section to work we also need crtbegin and crtend
 385    objects.  */
 386 #define TARGET_USE_JCR_SECTION 0
 387
 388 /* Decide whether it is safe to use a local alias for a virtual function
 389    when constructing thunks.  */
 390 #undef TARGET_USE_LOCAL_THUNK_ALIAS_P
 391 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) (!DECL_ONE_ONLY (DECL))
 392
 393 #define SUBTARGET_ATTRIBUTE_TABLE \
 394   { "selectany", 0, 0, true, false, false, ix86_handle_selectany_attribute }
 395   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
 396
 397 /*  mcount() does not need a counter variable.  */
 398 #undef NO_PROFILE_COUNTERS
 399 #define NO_PROFILE_COUNTERS 1
 400
 401 #define TARGET_VALID_DLLIMPORT_ATTRIBUTE_P i386_pe_valid_dllimport_attribute_p
 402 #define TARGET_CXX_ADJUST_CLASS_AT_DEFINITION i386_pe_adjust_class_at_definition
 403 #define TARGET_MANGLE_DECL_ASSEMBLER_NAME i386_pe_mangle_decl_assembler_name
 404
 405 #undef TREE
 406
 407 #ifndef BUFSIZ
 408 # undef FILE
 409 #endif