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