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) 1995-2017 Free Software Foundation, 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 #define DBX_DEBUGGING_INFO 1
  22 #define SDB_DEBUGGING_INFO 1
  23 #if TARGET_64BIT_DEFAULT || defined (HAVE_GAS_PE_SECREL32_RELOC)
  24 #define DWARF2_DEBUGGING_INFO 1
  25 #endif
  26
  27 #undef PREFERRED_DEBUGGING_TYPE
  28 #if (DWARF2_DEBUGGING_INFO)
  29 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
  30 #else
  31 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
  32 #endif
  33
  34 #undef TARGET_SEH
  35 #define TARGET_SEH  (TARGET_64BIT_MS_ABI && flag_unwind_tables)
  36
  37 /* Win64 with SEH cannot represent DRAP stack frames.  Disable its use.
  38    Force the use of different mechanisms to allocate aligned local data.  */
  39 #undef MAX_STACK_ALIGNMENT
  40 #define MAX_STACK_ALIGNMENT  (TARGET_SEH ? 128 : MAX_OFILE_ALIGNMENT)
  41
  42 /* 32-bit Windows aligns the stack on a 4-byte boundary but SSE instructions
  43    may require 16-byte alignment.  */
  44 #undef STACK_REALIGN_DEFAULT
  45 #define STACK_REALIGN_DEFAULT TARGET_SSE
  46
  47 /* Support hooks for SEH.  */
  48 #undef  TARGET_ASM_UNWIND_EMIT
  49 #define TARGET_ASM_UNWIND_EMIT  i386_pe_seh_unwind_emit
  50 #undef  TARGET_ASM_UNWIND_EMIT_BEFORE_INSN
  51 #define TARGET_ASM_UNWIND_EMIT_BEFORE_INSN  false
  52 #undef  TARGET_ASM_FUNCTION_END_PROLOGUE
  53 #define TARGET_ASM_FUNCTION_END_PROLOGUE  i386_pe_seh_end_prologue
  54 #undef  TARGET_ASM_EMIT_EXCEPT_PERSONALITY
  55 #define TARGET_ASM_EMIT_EXCEPT_PERSONALITY i386_pe_seh_emit_except_personality
  56 #undef  TARGET_ASM_INIT_SECTIONS
  57 #define TARGET_ASM_INIT_SECTIONS  i386_pe_seh_init_sections
  58 #define SUBTARGET_ASM_UNWIND_INIT  i386_pe_seh_init
  59
  60 #undef DEFAULT_ABI
  61 #define DEFAULT_ABI (TARGET_64BIT ? MS_ABI : SYSV_ABI)
  62
  63 #undef TARGET_PECOFF
  64 #define TARGET_PECOFF 1
  65
  66 #if ! defined (USE_MINGW64_LEADING_UNDERSCORES)
  67 #undef USER_LABEL_PREFIX
  68 #define USER_LABEL_PREFIX (TARGET_64BIT ? "" : "_")
  69
  70 #undef LOCAL_LABEL_PREFIX
  71 #define LOCAL_LABEL_PREFIX (TARGET_64BIT ? "." : "")
  72
  73 #undef ASM_GENERATE_INTERNAL_LABEL
  74 #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER)  \
  75   sprintf ((BUF), "*%s%s%ld", LOCAL_LABEL_PREFIX, \
  76            (PREFIX), (long)(NUMBER))
  77
  78 #undef LPREFIX
  79 #define LPREFIX (TARGET_64BIT ? ".L" : "L")
  80
  81 #endif
  82
  83 #undef DBX_REGISTER_NUMBER
  84 #define DBX_REGISTER_NUMBER(n)                          \
  85   (TARGET_64BIT ? dbx64_register_map[n]                 \
  86    : (write_symbols == DWARF2_DEBUG                     \
  87       ? svr4_dbx_register_map[n] : dbx_register_map[n]))
  88
  89 /* Map gcc register number to DWARF 2 CFA column number. For 32 bit
  90    target, always use the svr4_dbx_register_map for DWARF .eh_frame
  91    even if we don't use DWARF .debug_frame. */
  92 #undef DWARF_FRAME_REGNUM
  93 #define DWARF_FRAME_REGNUM(n)                           \
  94   (TARGET_64BIT ? dbx64_register_map[(n)]               \
  95                 : svr4_dbx_register_map[(n)])
  96
  97 /* The 64-bit MS_ABI changes the set of call-used registers.  */
  98 #undef DWARF_FRAME_REGISTERS
  99 #define DWARF_FRAME_REGISTERS (TARGET_64BIT ? 33 : 17)
 100
 101 #ifdef HAVE_GAS_PE_SECREL32_RELOC
 102 /* Use section relative relocations for debugging offsets.  Unlike
 103    other targets that fake this by putting the section VMA at 0, PE
 104    won't allow it.  */
 105 #define ASM_OUTPUT_DWARF_OFFSET(FILE, SIZE, LABEL, OFFSET, SECTION) \
 106   do {                                                          \
 107     switch (SIZE)                                               \
 108       {                                                         \
 109       case 4:                                                   \
 110         fputs ("\t.secrel32\t", FILE);                          \
 111         assemble_name (FILE, LABEL);                            \
 112         if ((OFFSET) != 0)                                      \
 113           fprintf (FILE, "+" HOST_WIDE_INT_PRINT_DEC,           \
 114                    (HOST_WIDE_INT) (OFFSET));                   \
 115         break;                                                  \
 116       case 8:                                                   \
 117         /* This is a hack.  There is no 64-bit section relative \
 118            relocation.  However, the COFF format also does not  \
 119            support 64-bit file offsets; 64-bit applications are \
 120            limited to 32-bits of code+data in any one module.   \
 121            Fake the 64-bit offset by zero-extending it.  */     \
 122         fputs ("\t.secrel32\t", FILE);                          \
 123         assemble_name (FILE, LABEL);                            \
 124         if ((OFFSET) != 0)                                      \
 125           fprintf (FILE, "+" HOST_WIDE_INT_PRINT_DEC,           \
 126                    (HOST_WIDE_INT) (OFFSET));                   \
 127         fputs ("\n\t.long\t0", FILE);                           \
 128         break;                                                  \
 129       default:                                                  \
 130         gcc_unreachable ();                                     \
 131       }                                                         \
 132   } while (0)
 133 #endif
 134
 135 #define TARGET_EXECUTABLE_SUFFIX ".exe"
 136
 137 #define TARGET_OS_CPP_BUILTINS()                                        \
 138   do                                                                    \
 139     {                                                                   \
 140         if (!TARGET_64BIT)                                              \
 141           builtin_define ("_X86_=1");                                   \
 142         if (TARGET_SEH)                                                 \
 143           builtin_define ("__SEH__");                           \
 144         builtin_assert ("system=winnt");                                \
 145         builtin_define ("__stdcall=__attribute__((__stdcall__))");      \
 146         builtin_define ("__fastcall=__attribute__((__fastcall__))");    \
 147         builtin_define ("__thiscall=__attribute__((__thiscall__))");    \
 148         builtin_define ("__cdecl=__attribute__((__cdecl__))");          \
 149         if (!flag_iso)                                                  \
 150           {                                                             \
 151             builtin_define ("_stdcall=__attribute__((__stdcall__))");   \
 152             builtin_define ("_fastcall=__attribute__((__fastcall__))"); \
 153             builtin_define ("_thiscall=__attribute__((__thiscall__))"); \
 154             builtin_define ("_cdecl=__attribute__((__cdecl__))");       \
 155           }                                                             \
 156         /* Even though linkonce works with static libs, this is needed  \
 157             to compare typeinfo symbols across dll boundaries.  */      \
 158         builtin_define ("__GXX_MERGED_TYPEINFO_NAMES=0");               \
 159         builtin_define ("__GXX_TYPEINFO_EQUALITY_INLINE=0");            \
 160         EXTRA_OS_CPP_BUILTINS ();                                       \
 161   }                                                                     \
 162   while (0)
 163
 164 /* Get tree.c to declare a target-specific specialization of
 165    merge_decl_attributes.  */
 166 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 1
 167
 168 /* This macro defines names of additional specifications to put in the specs
 169    that can be used in various specifications like CC1_SPEC.  Its definition
 170    is an initializer with a subgrouping for each command option.
 171
 172    Each subgrouping contains a string constant, that defines the
 173    specification name, and a string constant that used by the GCC driver
 174    program.
 175
 176    Do not define this macro if it does not need to do anything.  */
 177
 178 #undef  SUBTARGET_EXTRA_SPECS
 179 #define SUBTARGET_EXTRA_SPECS                                           \
 180   { "mingw_include_path", DEFAULT_TARGET_MACHINE }
 181
 182 #undef MATH_LIBRARY
 183 #define MATH_LIBRARY ""
 184
 185 #undef TARGET_LIBC_HAS_FUNCTION
 186 #define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function
 187
 188 #define SIZE_TYPE (TARGET_64BIT ? "long long unsigned int" : "unsigned int")
 189 #define PTRDIFF_TYPE (TARGET_64BIT ? "long long int" : "int")
 190
 191 #define WCHAR_TYPE_SIZE 16
 192 #define WCHAR_TYPE "short unsigned int"
 193
 194 /* Windows64 continues to use a 32-bit long type.  */
 195 #undef LONG_TYPE_SIZE
 196 #define LONG_TYPE_SIZE 32
 197 \f
 198 #define drectve_section() \
 199   (fprintf (asm_out_file, "\t.section .drectve\n"), \
 200    in_section = NULL)
 201
 202 /* Older versions of gas don't handle 'r' as data.
 203    Explicitly set data flag with 'd'.  */
 204 #define READONLY_DATA_SECTION_ASM_OP "\t.section .rdata,\"dr\""
 205
 206 /* Don't allow flag_pic to propagate since gas may produce invalid code
 207    otherwise.  */
 208
 209 #undef  SUBTARGET_OVERRIDE_OPTIONS
 210 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 211 do {                                                                    \
 212   flag_pic = TARGET_64BIT ? 1 : 0;                                      \
 213 } while (0)
 214
 215 /* Define this macro if references to a symbol must be treated
 216    differently depending on something about the variable or
 217    function named by the symbol (such as what section it is in).
 218
 219    On i386 running Windows NT, modify the assembler name with a suffix
 220    consisting of an atsign (@) followed by string of digits that represents
 221    the number of bytes of arguments passed to the function, if it has the
 222    attribute STDCALL.
 223
 224    In addition, we must mark dll symbols specially. Definitions of
 225    dllexport'd objects install some info in the .drectve section.
 226    References to dllimport'd objects are fetched indirectly via
 227    _imp__.  If both are declared, dllexport overrides.  This is also
 228    needed to implement one-only vtables: they go into their own
 229    section and we need to set DECL_SECTION_NAME so we do that here.
 230    Note that we can be called twice on the same decl.  */
 231
 232 #define SUBTARGET_ENCODE_SECTION_INFO  i386_pe_encode_section_info
 233
 234 /* Local and global relocs can be placed always into readonly memory
 235    for PE-COFF targets.  */
 236 #undef TARGET_ASM_RELOC_RW_MASK
 237 #define TARGET_ASM_RELOC_RW_MASK i386_pe_reloc_rw_mask
 238
 239 /* Output a common block.  */
 240 #undef ASM_OUTPUT_ALIGNED_DECL_COMMON
 241 #define ASM_OUTPUT_ALIGNED_DECL_COMMON \
 242   i386_pe_asm_output_aligned_decl_common
 243
 244 /* Output the label for an initialized variable.  */
 245 #undef ASM_DECLARE_OBJECT_NAME
 246 #define ASM_DECLARE_OBJECT_NAME(STREAM, NAME, DECL)     \
 247 do {                                                    \
 248   i386_pe_maybe_record_exported_symbol (DECL, NAME, 1); \
 249   ASM_OUTPUT_LABEL ((STREAM), (NAME));                  \
 250 } while (0)
 251
 252 /* Output a reference to a label. Fastcall function symbols
 253    keep their '@' prefix, while other symbols are prefixed
 254    with user_label_prefix.  */
 255 #undef ASM_OUTPUT_LABELREF
 256 #define  ASM_OUTPUT_LABELREF(STREAM, NAME)      \
 257 do {                                            \
 258   if ((NAME)[0] != FASTCALL_PREFIX)             \
 259     fputs (user_label_prefix, (STREAM));        \
 260   fputs ((NAME), (STREAM));                     \
 261 } while (0)
 262
 263 /* This does much the same in memory rather than to a stream.  */
 264 #undef TARGET_MANGLE_ASSEMBLER_NAME
 265 #define TARGET_MANGLE_ASSEMBLER_NAME i386_pe_mangle_assembler_name
 266
 267 \f
 268 /* Emit code to check the stack when allocating more than 4000
 269    bytes in one go.  */
 270 #define CHECK_STACK_LIMIT 4000
 271
 272 #undef STACK_BOUNDARY
 273 #define STACK_BOUNDARY  (TARGET_64BIT && ix86_abi == MS_ABI ? 128 : BITS_PER_WORD)
 274
 275 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 276    returns float values in the 387 and needs stack probes.
 277    We also align doubles to 64-bits for MSVC default compatibility.  */
 278
 279 #undef TARGET_SUBTARGET_DEFAULT
 280 #define TARGET_SUBTARGET_DEFAULT \
 281         (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS \
 282          | MASK_STACK_PROBE | MASK_ALIGN_DOUBLE)
 283
 284 #undef TARGET_SUBTARGET64_DEFAULT
 285 #define TARGET_SUBTARGET64_DEFAULT \
 286         MASK_128BIT_LONG_DOUBLE
 287
 288 /* This is how to output an assembler line
 289    that says to advance the location counter
 290    to a multiple of 2**LOG bytes.  */
 291
 292 #undef ASM_OUTPUT_ALIGN
 293 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 294     if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
 295
 296 /* Windows uses explicit import from shared libraries.  */
 297 #define MULTIPLE_SYMBOL_SPACES 1
 298
 299 #define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section
 300 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 301
 302 #define SUPPORTS_ONE_ONLY 1
 303
 304 /* Switch into a generic section.  */
 305 #define TARGET_ASM_NAMED_SECTION  i386_pe_asm_named_section
 306
 307 /* Select attributes for named sections.  */
 308 #define TARGET_SECTION_TYPE_FLAGS  i386_pe_section_type_flags
 309
 310 /* Write the extra assembler code needed to declare a function
 311    properly.  If we are generating SDB debugging information, this
 312    will happen automatically, so we only need to handle other cases.  */
 313 #undef ASM_DECLARE_FUNCTION_NAME
 314 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
 315   i386_pe_start_function (FILE, NAME, DECL)
 316
 317 #undef ASM_DECLARE_FUNCTION_SIZE
 318 #define ASM_DECLARE_FUNCTION_SIZE(FILE,NAME,DECL) \
 319   i386_pe_end_function (FILE, NAME, DECL)
 320
 321 /* Add an external function to the list of functions to be declared at
 322    the end of the file.  */
 323 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 324   do                                                                    \
 325     {                                                                   \
 326       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 327         i386_pe_record_external_function ((DECL), (NAME));              \
 328     }                                                                   \
 329   while (0)
 330
 331 /* Declare the type properly for any external libcall.  */
 332 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
 333   i386_pe_declare_function_type (FILE, XSTR (FUN, 0), 1)
 334
 335 /* This says out to put a global symbol in the BSS section.  */
 336 #undef ASM_OUTPUT_ALIGNED_BSS
 337 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 338   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 339
 340 /* Output function declarations at the end of the file.  */
 341 #undef TARGET_ASM_FILE_END
 342 #define TARGET_ASM_FILE_END i386_pe_file_end
 343
 344 #undef ASM_COMMENT_START
 345 #define ASM_COMMENT_START " #"
 346
 347 #ifndef DWARF2_UNWIND_INFO
 348 /* If configured with --disable-sjlj-exceptions, use DWARF2 for 32-bit
 349    mode else default to SJLJ.  64-bit code uses SEH unless you request
 350    SJLJ.  */
 351 #if  (defined (CONFIG_SJLJ_EXCEPTIONS) && !CONFIG_SJLJ_EXCEPTIONS)
 352 /* The logic of this #if must be kept synchronised with the logic
 353    for selecting the tmake_eh_file fragment in libgcc/config.host.  */
 354 #define DWARF2_UNWIND_INFO 1
 355 #else
 356 #define DWARF2_UNWIND_INFO 0
 357 #endif
 358 #endif
 359
 360 /* Don't assume anything about the header files.  */
 361 #define NO_IMPLICIT_EXTERN_C
 362
 363 #undef PROFILE_HOOK
 364 #define PROFILE_HOOK(LABEL)                                             \
 365   if (MAIN_NAME_P (DECL_NAME (current_function_decl)))                  \
 366     {                                                                   \
 367       emit_call_insn (gen_rtx_CALL (VOIDmode,                           \
 368         gen_rtx_MEM (FUNCTION_MODE,                                     \
 369                      gen_rtx_SYMBOL_REF (Pmode, "_monstartup")),        \
 370         const0_rtx));                                                   \
 371     }
 372
 373 /* Java Native Interface (JNI) methods on Win32 are invoked using the
 374    stdcall calling convention.  */
 375 #undef MODIFY_JNI_METHOD_CALL
 376 #define MODIFY_JNI_METHOD_CALL(MDECL)                                         \
 377   build_type_attribute_variant ((MDECL),                                      \
 378                                build_tree_list (get_identifier ("stdcall"),   \
 379                                                 NULL))
 380
 381 /* For Win32 ABI compatibility */
 382 #undef DEFAULT_PCC_STRUCT_RETURN
 383 #define DEFAULT_PCC_STRUCT_RETURN 0
 384
 385 /* MSVC returns aggregate types of up to 8 bytes via registers.
 386    See i386.c:ix86_return_in_memory.  */
 387 #undef MS_AGGREGATE_RETURN
 388 #define MS_AGGREGATE_RETURN 1
 389
 390 /* Biggest alignment supported by the object file format of this
 391    machine.  Use this macro to limit the alignment which can be
 392    specified using the `__attribute__ ((aligned (N)))' construct.  If
 393    not defined, the default value is `BIGGEST_ALIGNMENT'.  */
 394 /* IMAGE_SCN_ALIGN_8192BYTES is the largest section alignment flag
 395    specified in the PECOFF60 spec.  Native MS compiler also limits
 396    user-specified alignment to 8192 bytes.  */
 397 #undef MAX_OFILE_ALIGNMENT
 398 #define MAX_OFILE_ALIGNMENT (8192 * 8)
 399
 400 /* BIGGEST_FIELD_ALIGNMENT macro is used directly by libobjc, There, we
 401    align internal doubles in structures on dword boundaries. Otherwise,
 402    support vector modes using ADJUST_FIELD_ALIGN, defined in i386.h.  */
 403 #ifdef IN_TARGET_LIBS
 404 #undef  BIGGEST_FIELD_ALIGNMENT
 405 #define BIGGEST_FIELD_ALIGNMENT 64
 406 #endif
 407
 408 /* A bit-field declared as `int' forces `int' alignment for the struct.  */
 409 #undef PCC_BITFIELD_TYPE_MATTERS
 410 #define PCC_BITFIELD_TYPE_MATTERS 1
 411 #define GROUP_BITFIELDS_BY_ALIGN TYPE_NATIVE(rec)
 412
 413 /* Enable alias attribute support.  */
 414 #ifndef SET_ASM_OP
 415 #define SET_ASM_OP "\t.set\t"
 416 #endif
 417
 418 /* This implements the `alias' attribute, keeping any stdcall or
 419    fastcall decoration.  */
 420 #undef  ASM_OUTPUT_DEF_FROM_DECLS
 421 #define ASM_OUTPUT_DEF_FROM_DECLS(STREAM, DECL, TARGET)                 \
 422   do                                                                    \
 423     {                                                                   \
 424       const char *alias                                                 \
 425         = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));              \
 426       i386_pe_maybe_record_exported_symbol (DECL, alias, 0);            \
 427       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 428         i386_pe_declare_function_type (STREAM, alias,                   \
 429                                        TREE_PUBLIC (DECL));             \
 430       ASM_OUTPUT_DEF (STREAM, alias, IDENTIFIER_POINTER (TARGET));      \
 431     } while (0)
 432
 433 /* GNU as supports weak symbols on PECOFF. */
 434 #ifdef HAVE_GAS_WEAK
 435 #define ASM_WEAKEN_LABEL(FILE, NAME)  \
 436   do                                  \
 437     {                                 \
 438       fputs ("\t.weak\t", (FILE));    \
 439       assemble_name ((FILE), (NAME)); \
 440       fputc ('\n', (FILE));           \
 441     }                                 \
 442   while (0)
 443
 444 #endif /* HAVE_GAS_WEAK */
 445
 446 /* Decide whether it is safe to use a local alias for a virtual function
 447    when constructing thunks.  */
 448 #undef TARGET_USE_LOCAL_THUNK_ALIAS_P
 449 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) (!DECL_ONE_ONLY (DECL))
 450
 451 #define SUBTARGET_ATTRIBUTE_TABLE \
 452   { "selectany", 0, 0, true, false, false, ix86_handle_selectany_attribute, \
 453     false }
 454   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler,
 455        affects_type_identity } */
 456
 457 /*  mcount() does not need a counter variable.  */
 458 #undef NO_PROFILE_COUNTERS
 459 #define NO_PROFILE_COUNTERS 1
 460
 461 #define TARGET_VALID_DLLIMPORT_ATTRIBUTE_P i386_pe_valid_dllimport_attribute_p
 462 #define TARGET_CXX_ADJUST_CLASS_AT_DEFINITION i386_pe_adjust_class_at_definition
 463 #define SUBTARGET_MANGLE_DECL_ASSEMBLER_NAME i386_pe_mangle_decl_assembler_name
 464
 465 #undef TARGET_ASM_ASSEMBLE_VISIBILITY
 466 #define TARGET_ASM_ASSEMBLE_VISIBILITY i386_pe_assemble_visibility
 467
 468 #undef SUB_TARGET_RECORD_STUB
 469 #define SUB_TARGET_RECORD_STUB i386_pe_record_stub
 470
 471 /* Static stack checking is supported by means of probes.  */
 472 #define STACK_CHECK_STATIC_BUILTIN 1