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_SEH
  37 #define TARGET_SEH  (TARGET_64BIT_MS_ABI && flag_unwind_tables)
  38
  39 /* Win64 with SEH cannot represent DRAP stack frames.  Disable its use.
  40    Force the use of different mechanisms to allocate aligned local data.  */
  41 #undef MAX_STACK_ALIGNMENT
  42 #define MAX_STACK_ALIGNMENT  (TARGET_SEH ? 128 : MAX_OFILE_ALIGNMENT)
  43
  44 /* Support hooks for SEH.  */
  45 #undef  TARGET_ASM_UNWIND_EMIT
  46 #define TARGET_ASM_UNWIND_EMIT  i386_pe_seh_unwind_emit
  47 #undef  TARGET_ASM_UNWIND_EMIT_BEFORE_INSN
  48 #define TARGET_ASM_UNWIND_EMIT_BEFORE_INSN  false
  49 #undef  TARGET_ASM_FUNCTION_END_PROLOGUE
  50 #define TARGET_ASM_FUNCTION_END_PROLOGUE  i386_pe_seh_end_prologue
  51 #define SUBTARGET_ASM_UNWIND_INIT  i386_pe_seh_init
  52
  53 #undef DEFAULT_ABI
  54 #define DEFAULT_ABI (TARGET_64BIT ? MS_ABI : SYSV_ABI)
  55
  56 #if ! defined (USE_MINGW64_LEADING_UNDERSCORES)
  57 #undef USER_LABEL_PREFIX
  58 #define USER_LABEL_PREFIX (TARGET_64BIT ? "" : "_")
  59
  60 #undef LOCAL_LABEL_PREFIX
  61 #define LOCAL_LABEL_PREFIX (TARGET_64BIT ? "." : "")
  62
  63 #undef ASM_GENERATE_INTERNAL_LABEL
  64 #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER)  \
  65   sprintf ((BUF), "*%s%s%ld", LOCAL_LABEL_PREFIX, \
  66            (PREFIX), (long)(NUMBER))
  67
  68 #undef LPREFIX
  69 #define LPREFIX (TARGET_64BIT ? ".L" : "L")
  70
  71 #endif
  72
  73 #undef DBX_REGISTER_NUMBER
  74 #define DBX_REGISTER_NUMBER(n)                          \
  75   (TARGET_64BIT ? dbx64_register_map[n]                 \
  76    : (write_symbols == DWARF2_DEBUG                     \
  77       ? svr4_dbx_register_map[n] : dbx_register_map[n]))
  78
  79 /* Map gcc register number to DWARF 2 CFA column number. For 32 bit
  80    target, always use the svr4_dbx_register_map for DWARF .eh_frame
  81    even if we don't use DWARF .debug_frame. */
  82 #undef DWARF_FRAME_REGNUM
  83 #define DWARF_FRAME_REGNUM(n)                           \
  84   (TARGET_64BIT ? dbx64_register_map[(n)]               \
  85                 : svr4_dbx_register_map[(n)])
  86
  87 /* The MS_ABI changes the set of call-used registers.  */
  88 #undef DWARF_FRAME_REGISTERS
  89 #define DWARF_FRAME_REGISTERS (TARGET_64BIT ? 33 : 17)
  90
  91 #ifdef HAVE_GAS_PE_SECREL32_RELOC
  92 /* Use section relative relocations for debugging offsets.  Unlike
  93    other targets that fake this by putting the section VMA at 0, PE
  94    won't allow it.  */
  95 #define ASM_OUTPUT_DWARF_OFFSET(FILE, SIZE, LABEL, SECTION)     \
  96   do {                                                          \
  97     switch (SIZE)                                               \
  98       {                                                         \
  99       case 4:                                                   \
 100         fputs ("\t.secrel32\t", FILE);                          \
 101         assemble_name (FILE, LABEL);                            \
 102         break;                                                  \
 103       case 8:                                                   \
 104         /* This is a hack.  There is no 64-bit section relative \
 105            relocation.  However, the COFF format also does not  \
 106            support 64-bit file offsets; 64-bit applications are \
 107            limited to 32-bits of code+data in any one module.   \
 108            Fake the 64-bit offset by zero-extending it.  */     \
 109         fputs ("\t.secrel32\t", FILE);                          \
 110         assemble_name (FILE, LABEL);                            \
 111         fputs ("\n\t.long\t0", FILE);                           \
 112         break;                                                  \
 113       default:                                                  \
 114         gcc_unreachable ();                                     \
 115       }                                                         \
 116   } while (0)
 117 #endif
 118
 119 #define TARGET_EXECUTABLE_SUFFIX ".exe"
 120
 121 #define TARGET_OS_CPP_BUILTINS()                                        \
 122   do                                                                    \
 123     {                                                                   \
 124         if (!TARGET_64BIT)                                              \
 125           builtin_define ("_X86_=1");                                   \
 126         if (TARGET_SEH)                                                 \
 127           builtin_define ("__SEH__");                           \
 128         builtin_assert ("system=winnt");                                \
 129         builtin_define ("__stdcall=__attribute__((__stdcall__))");      \
 130         builtin_define ("__fastcall=__attribute__((__fastcall__))");    \
 131         builtin_define ("__thiscall=__attribute__((__thiscall__))");    \
 132         builtin_define ("__cdecl=__attribute__((__cdecl__))");          \
 133         if (!flag_iso)                                                  \
 134           {                                                             \
 135             builtin_define ("_stdcall=__attribute__((__stdcall__))");   \
 136             builtin_define ("_fastcall=__attribute__((__fastcall__))"); \
 137             builtin_define ("_thiscall=__attribute__((__thiscall__))"); \
 138             builtin_define ("_cdecl=__attribute__((__cdecl__))");       \
 139           }                                                             \
 140         /* Even though linkonce works with static libs, this is needed  \
 141             to compare typeinfo symbols across dll boundaries.  */      \
 142         builtin_define ("__GXX_MERGED_TYPEINFO_NAMES=0");               \
 143         builtin_define ("__GXX_TYPEINFO_EQUALITY_INLINE=0");            \
 144         EXTRA_OS_CPP_BUILTINS ();                                       \
 145   }                                                                     \
 146   while (0)
 147
 148 /* Get tree.c to declare a target-specific specialization of
 149    merge_decl_attributes.  */
 150 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 1
 151
 152 /* This macro defines names of additional specifications to put in the specs
 153    that can be used in various specifications like CC1_SPEC.  Its definition
 154    is an initializer with a subgrouping for each command option.
 155
 156    Each subgrouping contains a string constant, that defines the
 157    specification name, and a string constant that used by the GCC driver
 158    program.
 159
 160    Do not define this macro if it does not need to do anything.  */
 161
 162 #undef  SUBTARGET_EXTRA_SPECS
 163 #define SUBTARGET_EXTRA_SPECS                                           \
 164   { "mingw_include_path", DEFAULT_TARGET_MACHINE }
 165
 166 #undef MATH_LIBRARY
 167 #define MATH_LIBRARY ""
 168
 169 #define SIZE_TYPE (TARGET_64BIT ? "long long unsigned int" : "unsigned int")
 170 #define PTRDIFF_TYPE (TARGET_64BIT ? "long long int" : "int")
 171
 172 #define WCHAR_TYPE_SIZE 16
 173 #define WCHAR_TYPE "short unsigned int"
 174
 175 /* Windows64 continues to use a 32-bit long type.  */
 176 #undef LONG_TYPE_SIZE
 177 #define LONG_TYPE_SIZE 32
 178 \f
 179 union tree_node;
 180 #define TREE union tree_node *
 181 \f
 182 #define drectve_section() \
 183   (fprintf (asm_out_file, "\t.section .drectve\n"), \
 184    in_section = NULL)
 185
 186 /* Older versions of gas don't handle 'r' as data.
 187    Explicitly set data flag with 'd'.  */
 188 #define READONLY_DATA_SECTION_ASM_OP "\t.section .rdata,\"dr\""
 189
 190 /* Don't allow flag_pic to propagate since gas may produce invalid code
 191    otherwise.  */
 192
 193 #undef  SUBTARGET_OVERRIDE_OPTIONS
 194 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 195 do {                                                                    \
 196   if (TARGET_64BIT && flag_pic != 1)                                    \
 197     {                                                                   \
 198       if (flag_pic > 1)                                                 \
 199         warning (0,                                                     \
 200                  "-fPIC ignored for target (all code is position independent)"\
 201                  );                                                     \
 202       flag_pic = 1;                                                     \
 203     }                                                                   \
 204   else if (!TARGET_64BIT && flag_pic)                                   \
 205     {                                                                   \
 206       warning (0, "-f%s ignored for target (all code is position independent)",\
 207                (flag_pic > 1) ? "PIC" : "pic");                         \
 208       flag_pic = 0;                                                     \
 209     }                                                                   \
 210 } while (0)                                                             \
 211
 212 /* Define this macro if references to a symbol must be treated
 213    differently depending on something about the variable or
 214    function named by the symbol (such as what section it is in).
 215
 216    On i386 running Windows NT, modify the assembler name with a suffix
 217    consisting of an atsign (@) followed by string of digits that represents
 218    the number of bytes of arguments passed to the function, if it has the
 219    attribute STDCALL.
 220
 221    In addition, we must mark dll symbols specially. Definitions of
 222    dllexport'd objects install some info in the .drectve section.
 223    References to dllimport'd objects are fetched indirectly via
 224    _imp__.  If both are declared, dllexport overrides.  This is also
 225    needed to implement one-only vtables: they go into their own
 226    section and we need to set DECL_SECTION_NAME so we do that here.
 227    Note that we can be called twice on the same decl.  */
 228
 229 #define SUBTARGET_ENCODE_SECTION_INFO  i386_pe_encode_section_info
 230
 231 /* Output a common block.  */
 232 #undef ASM_OUTPUT_ALIGNED_DECL_COMMON
 233 #define ASM_OUTPUT_ALIGNED_DECL_COMMON \
 234   i386_pe_asm_output_aligned_decl_common
 235
 236 /* Output the label for an initialized variable.  */
 237 #undef ASM_DECLARE_OBJECT_NAME
 238 #define ASM_DECLARE_OBJECT_NAME(STREAM, NAME, DECL)     \
 239 do {                                                    \
 240   i386_pe_maybe_record_exported_symbol (DECL, NAME, 1); \
 241   ASM_OUTPUT_LABEL ((STREAM), (NAME));                  \
 242 } while (0)
 243
 244 /* Output a reference to a label. Fastcall function symbols
 245    keep their '@' prefix, while other symbols are prefixed
 246    with user_label_prefix.  */
 247 #undef ASM_OUTPUT_LABELREF
 248 #define  ASM_OUTPUT_LABELREF(STREAM, NAME)      \
 249 do {                                            \
 250   if ((NAME)[0] != FASTCALL_PREFIX)             \
 251     fputs (user_label_prefix, (STREAM));        \
 252   fputs ((NAME), (STREAM));                     \
 253 } while (0)
 254
 255 /* This does much the same in memory rather than to a stream.  */
 256 #undef TARGET_MANGLE_ASSEMBLER_NAME
 257 #define TARGET_MANGLE_ASSEMBLER_NAME i386_pe_mangle_assembler_name
 258
 259 \f
 260 /* Emit code to check the stack when allocating more than 4000
 261    bytes in one go.  */
 262 #define CHECK_STACK_LIMIT 4000
 263
 264 #undef STACK_BOUNDARY
 265 #define STACK_BOUNDARY  (ix86_abi == MS_ABI ? 128 : BITS_PER_WORD)
 266
 267 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 268    returns float values in the 387 and needs stack probes.
 269    We also align doubles to 64-bits for MSVC default compatibility.  */
 270
 271 #undef TARGET_SUBTARGET_DEFAULT
 272 #define TARGET_SUBTARGET_DEFAULT \
 273         (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS \
 274          | MASK_STACK_PROBE | MASK_ALIGN_DOUBLE)
 275
 276 #undef TARGET_SUBTARGET64_DEFAULT
 277 #define TARGET_SUBTARGET64_DEFAULT \
 278         MASK_128BIT_LONG_DOUBLE
 279
 280 /* This is how to output an assembler line
 281    that says to advance the location counter
 282    to a multiple of 2**LOG bytes.  */
 283
 284 #undef ASM_OUTPUT_ALIGN
 285 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 286     if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
 287
 288 /* Windows uses explicit import from shared libraries.  */
 289 #define MULTIPLE_SYMBOL_SPACES 1
 290
 291 #define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section
 292 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 293
 294 #define SUPPORTS_ONE_ONLY 1
 295
 296 /* Switch into a generic section.  */
 297 #define TARGET_ASM_NAMED_SECTION  i386_pe_asm_named_section
 298
 299 /* Select attributes for named sections.  */
 300 #define TARGET_SECTION_TYPE_FLAGS  i386_pe_section_type_flags
 301
 302 /* Write the extra assembler code needed to declare a function
 303    properly.  If we are generating SDB debugging information, this
 304    will happen automatically, so we only need to handle other cases.  */
 305 #undef ASM_DECLARE_FUNCTION_NAME
 306 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
 307   i386_pe_start_function (FILE, NAME, DECL)
 308
 309 #undef ASM_DECLARE_FUNCTION_SIZE
 310 #define ASM_DECLARE_FUNCTION_SIZE(FILE,NAME,DECL) \
 311   i386_pe_end_function (FILE, NAME, DECL)
 312
 313 /* Add an external function to the list of functions to be declared at
 314    the end of the file.  */
 315 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 316   do                                                                    \
 317     {                                                                   \
 318       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 319         i386_pe_record_external_function ((DECL), (NAME));              \
 320     }                                                                   \
 321   while (0)
 322
 323 /* Declare the type properly for any external libcall.  */
 324 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
 325   i386_pe_declare_function_type (FILE, XSTR (FUN, 0), 1)
 326
 327 /* This says out to put a global symbol in the BSS section.  */
 328 #undef ASM_OUTPUT_ALIGNED_BSS
 329 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 330   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 331
 332 /* Put all *tf routines in libgcc.  */
 333 #undef LIBGCC2_HAS_TF_MODE
 334 #define LIBGCC2_HAS_TF_MODE 1
 335 #define LIBGCC2_TF_CEXT q
 336 #define TF_SIZE 113
 337
 338 /* Output function declarations at the end of the file.  */
 339 #undef TARGET_ASM_FILE_END
 340 #define TARGET_ASM_FILE_END i386_pe_file_end
 341
 342 #undef ASM_COMMENT_START
 343 #define ASM_COMMENT_START " #"
 344
 345 #ifndef DWARF2_UNWIND_INFO
 346 /* If configured with --disable-sjlj-exceptions, use DWARF2, else
 347    default to SJLJ.  */
 348 #if  (defined (CONFIG_SJLJ_EXCEPTIONS) && !CONFIG_SJLJ_EXCEPTIONS)
 349 /* The logic of this #if must be kept synchronised with the logic
 350    for selecting the tmake_eh_file fragment in config.gcc.  */
 351 #define DWARF2_UNWIND_INFO 1
 352 /* If multilib is selected break build as sjlj is required.  */
 353 #if defined (TARGET_BI_ARCH)
 354 #error For 64-bit windows and 32-bit based multilib version of gcc just SJLJ exceptions are supported.
 355 #endif
 356 #else
 357 #define DWARF2_UNWIND_INFO 0
 358 #endif
 359 #endif
 360
 361 /* Don't assume anything about the header files.  */
 362 #define NO_IMPLICIT_EXTERN_C
 363
 364 #undef PROFILE_HOOK
 365 #define PROFILE_HOOK(LABEL)                                             \
 366   if (MAIN_NAME_P (DECL_NAME (current_function_decl)))                  \
 367     {                                                                   \
 368       emit_call_insn (gen_rtx_CALL (VOIDmode,                           \
 369         gen_rtx_MEM (FUNCTION_MODE,                                     \
 370                      gen_rtx_SYMBOL_REF (Pmode, "_monstartup")),        \
 371         const0_rtx));                                                   \
 372     }
 373
 374 /* Java Native Interface (JNI) methods on Win32 are invoked using the
 375    stdcall calling convention.  */
 376 #undef MODIFY_JNI_METHOD_CALL
 377 #define MODIFY_JNI_METHOD_CALL(MDECL)                                         \
 378   build_type_attribute_variant ((MDECL),                                      \
 379                                build_tree_list (get_identifier ("stdcall"),   \
 380                                                 NULL))
 381
 382 /* For Win32 ABI compatibility */
 383 #undef DEFAULT_PCC_STRUCT_RETURN
 384 #define DEFAULT_PCC_STRUCT_RETURN 0
 385
 386 /* MSVC returns aggregate types of up to 8 bytes via registers.
 387    See i386.c:ix86_return_in_memory.  */
 388 #undef MS_AGGREGATE_RETURN
 389 #define MS_AGGREGATE_RETURN 1
 390
 391 /* Biggest alignment supported by the object file format of this
 392    machine.  Use this macro to limit the alignment which can be
 393    specified using the `__attribute__ ((aligned (N)))' construct.  If
 394    not defined, the default value is `BIGGEST_ALIGNMENT'.  */
 395 /* IMAGE_SCN_ALIGN_8192BYTES is the largest section alignment flag
 396    specified in the PECOFF60 spec.  Native MS compiler also limits
 397    user-specified alignment to 8192 bytes.  */
 398 #undef MAX_OFILE_ALIGNMENT
 399 #define MAX_OFILE_ALIGNMENT (8192 * 8)
 400
 401 /* BIGGEST_FIELD_ALIGNMENT macro is used directly by libobjc, There, we
 402    align internal doubles in structures on dword boundaries. Otherwise,
 403    support vector modes using ADJUST_FIELD_ALIGN, defined in i386.h.  */
 404 #ifdef IN_TARGET_LIBS
 405 #undef  BIGGEST_FIELD_ALIGNMENT
 406 #define BIGGEST_FIELD_ALIGNMENT 64
 407 #endif
 408
 409 /* A bit-field declared as `int' forces `int' alignment for the struct.  */
 410 #undef PCC_BITFIELD_TYPE_MATTERS
 411 #define PCC_BITFIELD_TYPE_MATTERS 1
 412 #define GROUP_BITFIELDS_BY_ALIGN TYPE_NATIVE(rec)
 413
 414 /* Enable alias attribute support.  */
 415 #ifndef SET_ASM_OP
 416 #define SET_ASM_OP "\t.set\t"
 417 #endif
 418
 419 /* This implements the `alias' attribute, keeping any stdcall or
 420    fastcall decoration.  */
 421 #undef  ASM_OUTPUT_DEF_FROM_DECLS
 422 #define ASM_OUTPUT_DEF_FROM_DECLS(STREAM, DECL, TARGET)                 \
 423   do                                                                    \
 424     {                                                                   \
 425       const char *alias                                                 \
 426         = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));              \
 427       i386_pe_maybe_record_exported_symbol (DECL, alias, 0);            \
 428       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 429         i386_pe_declare_function_type (STREAM, alias,                   \
 430                                        TREE_PUBLIC (DECL));             \
 431       ASM_OUTPUT_DEF (STREAM, alias, IDENTIFIER_POINTER (TARGET));      \
 432     } while (0)
 433
 434 /* GNU as supports weak symbols on PECOFF. */
 435 #ifdef HAVE_GAS_WEAK
 436 #define ASM_WEAKEN_LABEL(FILE, NAME)  \
 437   do                                  \
 438     {                                 \
 439       fputs ("\t.weak\t", (FILE));    \
 440       assemble_name ((FILE), (NAME)); \
 441       fputc ('\n', (FILE));           \
 442     }                                 \
 443   while (0)
 444 #endif /* HAVE_GAS_WEAK */
 445
 446 /* FIXME: SUPPORTS_WEAK && TARGET_HAVE_NAMED_SECTIONS is true,
 447    but for .jcr section to work we also need crtbegin and crtend
 448    objects.  */
 449 #define TARGET_USE_JCR_SECTION 1
 450
 451 /* Decide whether it is safe to use a local alias for a virtual function
 452    when constructing thunks.  */
 453 #undef TARGET_USE_LOCAL_THUNK_ALIAS_P
 454 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) (!DECL_ONE_ONLY (DECL))
 455
 456 #define SUBTARGET_ATTRIBUTE_TABLE \
 457   { "selectany", 0, 0, true, false, false, ix86_handle_selectany_attribute }
 458   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
 459
 460 /*  mcount() does not need a counter variable.  */
 461 #undef NO_PROFILE_COUNTERS
 462 #define NO_PROFILE_COUNTERS 1
 463
 464 #define TARGET_VALID_DLLIMPORT_ATTRIBUTE_P i386_pe_valid_dllimport_attribute_p
 465 #define TARGET_CXX_ADJUST_CLASS_AT_DEFINITION i386_pe_adjust_class_at_definition
 466 #define TARGET_MANGLE_DECL_ASSEMBLER_NAME i386_pe_mangle_decl_assembler_name
 467
 468 /* Static stack checking is supported by means of probes.  */
 469 #define STACK_CHECK_STATIC_BUILTIN 1
 470
 471 #undef TREE
 472
 473 #ifndef BUFSIZ
 474 # undef FILE
 475 #endif