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, 2010
   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 #if ! defined (USE_MINGW64_LEADING_UNDERSCORES)
  43 #undef USER_LABEL_PREFIX
  44 #define USER_LABEL_PREFIX (TARGET_64BIT ? "" : "_")
  45
  46 #undef LOCAL_LABEL_PREFIX
  47 #define LOCAL_LABEL_PREFIX (TARGET_64BIT ? "." : "")
  48
  49 #undef ASM_GENERATE_INTERNAL_LABEL
  50 #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER)  \
  51   sprintf ((BUF), "*%s%s%ld", LOCAL_LABEL_PREFIX, \
  52            (PREFIX), (long)(NUMBER))
  53
  54 #undef LPREFIX
  55 #define LPREFIX (TARGET_64BIT ? ".L" : "L")
  56
  57 #endif
  58
  59 #undef DBX_REGISTER_NUMBER
  60 #define DBX_REGISTER_NUMBER(n)                          \
  61   (TARGET_64BIT ? dbx64_register_map[n]                 \
  62    : (write_symbols == DWARF2_DEBUG                     \
  63       ? svr4_dbx_register_map[n] : dbx_register_map[n]))
  64
  65 /* Map gcc register number to DWARF 2 CFA column number. For 32 bit
  66    target, always use the svr4_dbx_register_map for DWARF .eh_frame
  67    even if we don't use DWARF .debug_frame. */
  68 #undef DWARF_FRAME_REGNUM
  69 #define DWARF_FRAME_REGNUM(n)                           \
  70   (TARGET_64BIT ? dbx64_register_map[(n)]               \
  71                 : svr4_dbx_register_map[(n)])
  72
  73 #ifdef HAVE_GAS_PE_SECREL32_RELOC
  74 /* Use section relative relocations for debugging offsets.  Unlike
  75    other targets that fake this by putting the section VMA at 0, PE
  76    won't allow it.  */
  77 #define ASM_OUTPUT_DWARF_OFFSET(FILE, SIZE, LABEL, SECTION)     \
  78   do {                                                          \
  79     if (SIZE != 4 && (!TARGET_64BIT || SIZE != 8))              \
  80       abort ();                                                 \
  81                                                                 \
  82     fputs ("\t.secrel32\t", FILE);                              \
  83     assemble_name (FILE, LABEL);                                \
  84   } while (0)
  85 #endif
  86
  87 #define TARGET_EXECUTABLE_SUFFIX ".exe"
  88
  89 #include <stdio.h>
  90
  91 #define TARGET_OS_CPP_BUILTINS()                                        \
  92   do                                                                    \
  93     {                                                                   \
  94         if (!TARGET_64BIT)                                              \
  95           builtin_define ("_X86_=1");                                   \
  96         builtin_assert ("system=winnt");                                \
  97         builtin_define ("__stdcall=__attribute__((__stdcall__))");      \
  98         builtin_define ("__fastcall=__attribute__((__fastcall__))");    \
  99         builtin_define ("__thiscall=__attribute__((__thiscall__))");    \
 100         builtin_define ("__cdecl=__attribute__((__cdecl__))");          \
 101         if (!flag_iso)                                                  \
 102           {                                                             \
 103             builtin_define ("_stdcall=__attribute__((__stdcall__))");   \
 104             builtin_define ("_fastcall=__attribute__((__fastcall__))"); \
 105             builtin_define ("_thiscall=__attribute__((__thiscall__))"); \
 106             builtin_define ("_cdecl=__attribute__((__cdecl__))");       \
 107           }                                                             \
 108         /* Even though linkonce works with static libs, this is needed  \
 109             to compare typeinfo symbols across dll boundaries.  */      \
 110         builtin_define ("__GXX_MERGED_TYPEINFO_NAMES=0");               \
 111         builtin_define ("__GXX_TYPEINFO_EQUALITY_INLINE=0");            \
 112         EXTRA_OS_CPP_BUILTINS ();                                       \
 113   }                                                                     \
 114   while (0)
 115
 116 /* Get tree.c to declare a target-specific specialization of
 117    merge_decl_attributes.  */
 118 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 1
 119
 120 /* This macro defines names of additional specifications to put in the specs
 121    that can be used in various specifications like CC1_SPEC.  Its definition
 122    is an initializer with a subgrouping for each command option.
 123
 124    Each subgrouping contains a string constant, that defines the
 125    specification name, and a string constant that used by the GCC driver
 126    program.
 127
 128    Do not define this macro if it does not need to do anything.  */
 129
 130 #undef  SUBTARGET_EXTRA_SPECS
 131 #define SUBTARGET_EXTRA_SPECS                                           \
 132   { "mingw_include_path", DEFAULT_TARGET_MACHINE }
 133
 134 #undef MATH_LIBRARY
 135 #define MATH_LIBRARY ""
 136
 137 #define SIZE_TYPE (TARGET_64BIT ? "long long unsigned int" : "unsigned int")
 138 #define PTRDIFF_TYPE (TARGET_64BIT ? "long long int" : "int")
 139
 140 #define WCHAR_TYPE_SIZE 16
 141 #define WCHAR_TYPE "short unsigned int"
 142
 143 /* Windows64 continues to use a 32-bit long type.  */
 144 #undef LONG_TYPE_SIZE
 145 #define LONG_TYPE_SIZE 32
 146 \f
 147 /* Enable parsing of #pragma pack(push,<n>) and #pragma pack(pop).  */
 148 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
 149
 150 union tree_node;
 151 #define TREE union tree_node *
 152 \f
 153 #define drectve_section() \
 154   (fprintf (asm_out_file, "\t.section .drectve\n"), \
 155    in_section = NULL)
 156
 157 /* Older versions of gas don't handle 'r' as data.
 158    Explicitly set data flag with 'd'.  */
 159 #define READONLY_DATA_SECTION_ASM_OP "\t.section .rdata,\"dr\""
 160
 161 /* Don't allow flag_pic to propagate since gas may produce invalid code
 162    otherwise.  */
 163
 164 #undef  SUBTARGET_OVERRIDE_OPTIONS
 165 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 166 do {                                                                    \
 167   if (TARGET_64BIT && flag_pic != 1)                                    \
 168     {                                                                   \
 169       if (flag_pic > 1)                                                 \
 170         warning (0,                                                     \
 171                  "-fPIC ignored for target (all code is position independent)"\
 172                  );                                                     \
 173       flag_pic = 1;                                                     \
 174     }                                                                   \
 175   else if (!TARGET_64BIT && flag_pic)                                   \
 176     {                                                                   \
 177       warning (0, "-f%s ignored for target (all code is position independent)",\
 178                (flag_pic > 1) ? "PIC" : "pic");                         \
 179       flag_pic = 0;                                                     \
 180     }                                                                   \
 181 } while (0)                                                             \
 182
 183 /* Define this macro if references to a symbol must be treated
 184    differently depending on something about the variable or
 185    function named by the symbol (such as what section it is in).
 186
 187    On i386 running Windows NT, modify the assembler name with a suffix
 188    consisting of an atsign (@) followed by string of digits that represents
 189    the number of bytes of arguments passed to the function, if it has the
 190    attribute STDCALL.
 191
 192    In addition, we must mark dll symbols specially. Definitions of
 193    dllexport'd objects install some info in the .drectve section.
 194    References to dllimport'd objects are fetched indirectly via
 195    _imp__.  If both are declared, dllexport overrides.  This is also
 196    needed to implement one-only vtables: they go into their own
 197    section and we need to set DECL_SECTION_NAME so we do that here.
 198    Note that we can be called twice on the same decl.  */
 199
 200 #define SUBTARGET_ENCODE_SECTION_INFO  i386_pe_encode_section_info
 201
 202 /* Output a common block.  */
 203 #undef ASM_OUTPUT_ALIGNED_DECL_COMMON
 204 #define ASM_OUTPUT_ALIGNED_DECL_COMMON \
 205   i386_pe_asm_output_aligned_decl_common
 206
 207 /* Output the label for an initialized variable.  */
 208 #undef ASM_DECLARE_OBJECT_NAME
 209 #define ASM_DECLARE_OBJECT_NAME(STREAM, NAME, DECL)     \
 210 do {                                                    \
 211   i386_pe_maybe_record_exported_symbol (DECL, NAME, 1); \
 212   ASM_OUTPUT_LABEL ((STREAM), (NAME));                  \
 213 } while (0)
 214
 215 /* Output a reference to a label. Fastcall function symbols
 216    keep their '@' prefix, while other symbols are prefixed
 217    with user_label_prefix.  */
 218 #undef ASM_OUTPUT_LABELREF
 219 #define  ASM_OUTPUT_LABELREF(STREAM, NAME)      \
 220 do {                                            \
 221   if ((NAME)[0] != FASTCALL_PREFIX)             \
 222     fputs (user_label_prefix, (STREAM));        \
 223   fputs ((NAME), (STREAM));                     \
 224 } while (0)
 225
 226 \f
 227 /* Emit code to check the stack when allocating more than 4000
 228    bytes in one go.  */
 229 #define CHECK_STACK_LIMIT 4000
 230
 231 #undef STACK_BOUNDARY
 232 #define STACK_BOUNDARY  (ix86_abi == MS_ABI ? 128 : BITS_PER_WORD)
 233
 234 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 235    returns float values in the 387 and needs stack probes.
 236    We also align doubles to 64-bits for MSVC default compatibility.  */
 237
 238 #undef TARGET_SUBTARGET_DEFAULT
 239 #define TARGET_SUBTARGET_DEFAULT \
 240         (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS \
 241          | MASK_STACK_PROBE | MASK_ALIGN_DOUBLE)
 242
 243 #undef TARGET_SUBTARGET64_DEFAULT
 244 #define TARGET_SUBTARGET64_DEFAULT \
 245         MASK_128BIT_LONG_DOUBLE
 246
 247 /* This is how to output an assembler line
 248    that says to advance the location counter
 249    to a multiple of 2**LOG bytes.  */
 250
 251 #undef ASM_OUTPUT_ALIGN
 252 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 253     if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
 254
 255 /* Windows uses explicit import from shared libraries.  */
 256 #define MULTIPLE_SYMBOL_SPACES 1
 257
 258 #define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section
 259 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 260
 261 #define SUPPORTS_ONE_ONLY 1
 262
 263 /* Switch into a generic section.  */
 264 #define TARGET_ASM_NAMED_SECTION  i386_pe_asm_named_section
 265
 266 /* Select attributes for named sections.  */
 267 #define TARGET_SECTION_TYPE_FLAGS  i386_pe_section_type_flags
 268
 269 /* Write the extra assembler code needed to declare a function
 270    properly.  If we are generating SDB debugging information, this
 271    will happen automatically, so we only need to handle other cases.  */
 272 #undef ASM_DECLARE_FUNCTION_NAME
 273 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 274   do                                                                    \
 275     {                                                                   \
 276       i386_pe_maybe_record_exported_symbol (DECL, NAME, 0);             \
 277       if (write_symbols != SDB_DEBUG)                                   \
 278         i386_pe_declare_function_type (FILE, NAME, TREE_PUBLIC (DECL)); \
 279       ASM_OUTPUT_LABEL (FILE, NAME);                                    \
 280     }                                                                   \
 281   while (0)
 282
 283 /* Add an external function to the list of functions to be declared at
 284    the end of the file.  */
 285 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 286   do                                                                    \
 287     {                                                                   \
 288       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 289         i386_pe_record_external_function ((DECL), (NAME));              \
 290     }                                                                   \
 291   while (0)
 292
 293 /* Declare the type properly for any external libcall.  */
 294 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
 295   i386_pe_declare_function_type (FILE, XSTR (FUN, 0), 1)
 296
 297 /* This says out to put a global symbol in the BSS section.  */
 298 #undef ASM_OUTPUT_ALIGNED_BSS
 299 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 300   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 301
 302 /* Output function declarations at the end of the file.  */
 303 #undef TARGET_ASM_FILE_END
 304 #define TARGET_ASM_FILE_END i386_pe_file_end
 305
 306 #undef ASM_COMMENT_START
 307 #define ASM_COMMENT_START " #"
 308
 309 #ifndef DWARF2_UNWIND_INFO
 310 /* If configured with --disable-sjlj-exceptions, use DWARF2, else
 311    default to SJLJ.  */
 312 #if  (defined (CONFIG_SJLJ_EXCEPTIONS) && !CONFIG_SJLJ_EXCEPTIONS)
 313 /* The logic of this #if must be kept synchronised with the logic
 314    for selecting the tmake_eh_file fragment in config.gcc.  */
 315 #define DWARF2_UNWIND_INFO 1
 316 /* If multilib is selected break build as sjlj is required.  */
 317 #if defined (TARGET_BI_ARCH)
 318 #error For 64-bit windows and 32-bit based multilib version of gcc just SJLJ exceptions are supported.
 319 #endif
 320 #else
 321 #define DWARF2_UNWIND_INFO 0
 322 #endif
 323 #endif
 324
 325 /* Don't assume anything about the header files.  */
 326 #define NO_IMPLICIT_EXTERN_C
 327
 328 #undef PROFILE_HOOK
 329 #define PROFILE_HOOK(LABEL)                                             \
 330   if (MAIN_NAME_P (DECL_NAME (current_function_decl)))                  \
 331     {                                                                   \
 332       emit_call_insn (gen_rtx_CALL (VOIDmode,                           \
 333         gen_rtx_MEM (FUNCTION_MODE,                                     \
 334                      gen_rtx_SYMBOL_REF (Pmode, "_monstartup")),        \
 335         const0_rtx));                                                   \
 336     }
 337
 338 /* Java Native Interface (JNI) methods on Win32 are invoked using the
 339    stdcall calling convention.  */
 340 #undef MODIFY_JNI_METHOD_CALL
 341 #define MODIFY_JNI_METHOD_CALL(MDECL)                                         \
 342   build_type_attribute_variant ((MDECL),                                      \
 343                                build_tree_list (get_identifier ("stdcall"),   \
 344                                                 NULL))
 345
 346 /* For Win32 ABI compatibility */
 347 #undef DEFAULT_PCC_STRUCT_RETURN
 348 #define DEFAULT_PCC_STRUCT_RETURN 0
 349
 350 /* MSVC returns aggregate types of up to 8 bytes via registers.
 351    See i386.c:ix86_return_in_memory.  */
 352 #undef MS_AGGREGATE_RETURN
 353 #define MS_AGGREGATE_RETURN 1
 354
 355 /* Biggest alignment supported by the object file format of this
 356    machine.  Use this macro to limit the alignment which can be
 357    specified using the `__attribute__ ((aligned (N)))' construct.  If
 358    not defined, the default value is `BIGGEST_ALIGNMENT'.  */
 359 /* IMAGE_SCN_ALIGN_8192BYTES is the largest section alignment flag
 360    specified in the PECOFF60 spec.  Native MS compiler also limits
 361    user-specified alignment to 8192 bytes.  */
 362 #undef MAX_OFILE_ALIGNMENT
 363 #define MAX_OFILE_ALIGNMENT (8192 * 8)
 364
 365 /* BIGGEST_FIELD_ALIGNMENT macro is used directly by libobjc, There, we
 366    align internal doubles in structures on dword boundaries. Otherwise,
 367    support vector modes using ADJUST_FIELD_ALIGN, defined in i386.h.  */
 368 #ifdef IN_TARGET_LIBS
 369 #undef  BIGGEST_FIELD_ALIGNMENT
 370 #define BIGGEST_FIELD_ALIGNMENT 64
 371 #endif
 372
 373 /* A bit-field declared as `int' forces `int' alignment for the struct.  */
 374 #undef PCC_BITFIELD_TYPE_MATTERS
 375 #define PCC_BITFIELD_TYPE_MATTERS 1
 376 #define GROUP_BITFIELDS_BY_ALIGN TYPE_NATIVE(rec)
 377
 378 /* Enable alias attribute support.  */
 379 #ifndef SET_ASM_OP
 380 #define SET_ASM_OP "\t.set\t"
 381 #endif
 382
 383 /* This implements the `alias' attribute, keeping any stdcall or
 384    fastcall decoration.  */
 385 #undef  ASM_OUTPUT_DEF_FROM_DECLS
 386 #define ASM_OUTPUT_DEF_FROM_DECLS(STREAM, DECL, TARGET)                 \
 387   do                                                                    \
 388     {                                                                   \
 389       const char *alias                                                 \
 390         = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));              \
 391       i386_pe_maybe_record_exported_symbol (DECL, alias, 0);            \
 392       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 393         i386_pe_declare_function_type (STREAM, alias,                   \
 394                                        TREE_PUBLIC (DECL));             \
 395       ASM_OUTPUT_DEF (STREAM, alias, IDENTIFIER_POINTER (TARGET));      \
 396     } while (0)
 397
 398 /* GNU as supports weak symbols on PECOFF. */
 399 #ifdef HAVE_GAS_WEAK
 400 #define ASM_WEAKEN_LABEL(FILE, NAME)  \
 401   do                                  \
 402     {                                 \
 403       fputs ("\t.weak\t", (FILE));    \
 404       assemble_name ((FILE), (NAME)); \
 405       fputc ('\n', (FILE));           \
 406     }                                 \
 407   while (0)
 408 #endif /* HAVE_GAS_WEAK */
 409
 410 /* FIXME: SUPPORTS_WEAK && TARGET_HAVE_NAMED_SECTIONS is true,
 411    but for .jcr section to work we also need crtbegin and crtend
 412    objects.  */
 413 #define TARGET_USE_JCR_SECTION 1
 414
 415 /* Decide whether it is safe to use a local alias for a virtual function
 416    when constructing thunks.  */
 417 #undef TARGET_USE_LOCAL_THUNK_ALIAS_P
 418 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) (!DECL_ONE_ONLY (DECL))
 419
 420 #define SUBTARGET_ATTRIBUTE_TABLE \
 421   { "selectany", 0, 0, true, false, false, ix86_handle_selectany_attribute }
 422   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
 423
 424 /*  mcount() does not need a counter variable.  */
 425 #undef NO_PROFILE_COUNTERS
 426 #define NO_PROFILE_COUNTERS 1
 427
 428 #define TARGET_VALID_DLLIMPORT_ATTRIBUTE_P i386_pe_valid_dllimport_attribute_p
 429 #define TARGET_CXX_ADJUST_CLASS_AT_DEFINITION i386_pe_adjust_class_at_definition
 430 #define TARGET_MANGLE_DECL_ASSEMBLER_NAME i386_pe_mangle_decl_assembler_name
 431
 432 #undef TREE
 433
 434 #ifndef BUFSIZ
 435 # undef FILE
 436 #endif