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, 2004
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2, or (at your option)
  11 any later version.
  12
  13 GCC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING.  If not, write to
  20 the Free Software Foundation, 59 Temple Place - Suite 330,
  21 Boston, MA 02111-1307, USA.  */
  22
  23 #define DBX_DEBUGGING_INFO 1
  24 #define SDB_DEBUGGING_INFO 1
  25 #undef PREFERRED_DEBUGGING_TYPE
  26 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
  27
  28 #ifdef HAVE_GAS_PE_SECREL32_RELOC
  29 #define DWARF2_DEBUGGING_INFO 1
  30
  31 #undef DBX_REGISTER_NUMBER
  32 #define DBX_REGISTER_NUMBER(n) (write_symbols == DWARF2_DEBUG   \
  33                                 ? svr4_dbx_register_map[n]      \
  34                                 : dbx_register_map[n])
  35
  36 /* Use section relative relocations for debugging offsets.  Unlike
  37    other targets that fake this by putting the section VMA at 0, PE
  38    won't allow it.  */
  39 #define ASM_OUTPUT_DWARF_OFFSET(FILE, SIZE, LABEL)    \
  40   do {                                                \
  41     if (SIZE != 4)                                    \
  42       abort ();                                       \
  43                                                       \
  44     fputs ("\t.secrel32\t", FILE);                    \
  45     assemble_name (FILE, LABEL);                      \
  46   } while (0)
  47 #endif
  48
  49 #define TARGET_EXECUTABLE_SUFFIX ".exe"
  50
  51 #include <stdio.h>
  52
  53 /* Masks for subtarget switches used by other files.  */
  54 #define MASK_NOP_FUN_DLLIMPORT 0x08000000 /* Ignore dllimport for functions */
  55
  56 /* Used in winnt.c.  */
  57 #define TARGET_NOP_FUN_DLLIMPORT (target_flags & MASK_NOP_FUN_DLLIMPORT)
  58
  59 #undef  SUBTARGET_SWITCHES
  60 #define SUBTARGET_SWITCHES \
  61 { "cygwin",               0, N_("Use the Cygwin interface") },  \
  62 { "no-cygwin",            0, N_("Use the Mingw32 interface") }, \
  63 { "windows",              0, N_("Create GUI application") },    \
  64 { "no-win32",             0, N_("Don't set Windows defines") }, \
  65 { "win32",                0, N_("Set Windows defines") },       \
  66 { "console",              0, N_("Create console application") },\
  67 { "dll",                  0, N_("Generate code for a DLL") },   \
  68 { "nop-fun-dllimport",    MASK_NOP_FUN_DLLIMPORT,               \
  69   N_("Ignore dllimport for functions") },                       \
  70 { "no-nop-fun-dllimport", -MASK_NOP_FUN_DLLIMPORT, "" },        \
  71 { "threads",              0, N_("Use Mingw-specific thread support") },
  72
  73 #define MAYBE_UWIN_CPP_BUILTINS() /* Nothing.  */
  74
  75 /* Support the __declspec keyword by turning them into attributes.
  76    We currently only support: dllimport and dllexport.
  77    Note that the current way we do this may result in a collision with
  78    predefined attributes later on.  This can be solved by using one attribute,
  79    say __declspec__, and passing args to it.  The problem with that approach
  80    is that args are not accumulated: each new appearance would clobber any
  81    existing args.  */
  82
  83 #define TARGET_OS_CPP_BUILTINS()                                        \
  84   do                                                                    \
  85     {                                                                   \
  86         builtin_define ("_X86_=1");                                     \
  87         builtin_assert ("system=winnt");                                \
  88         builtin_define ("__stdcall=__attribute__((__stdcall__))");      \
  89         builtin_define ("__fastcall=__attribute__((__fastcall__))");    \
  90         builtin_define ("__cdecl=__attribute__((__cdecl__))");          \
  91         builtin_define ("__declspec(x)=__attribute__((x))");            \
  92         if (!flag_iso)                                                  \
  93           {                                                             \
  94             builtin_define ("_stdcall=__attribute__((__stdcall__))");   \
  95             builtin_define ("_fastcall=__attribute__((__fastcall__))"); \
  96             builtin_define ("_cdecl=__attribute__((__cdecl__))");       \
  97           }                                                             \
  98         MAYBE_UWIN_CPP_BUILTINS ();                                     \
  99         EXTRA_OS_CPP_BUILTINS ();                                       \
 100   }                                                                     \
 101   while (0)
 102
 103 /* Get tree.c to declare a target-specific specialization of
 104    merge_decl_attributes.  */
 105 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES
 106
 107 /* This macro defines names of additional specifications to put in the specs
 108    that can be used in various specifications like CC1_SPEC.  Its definition
 109    is an initializer with a subgrouping for each command option.
 110
 111    Each subgrouping contains a string constant, that defines the
 112    specification name, and a string constant that used by the GCC driver
 113    program.
 114
 115    Do not define this macro if it does not need to do anything.  */
 116
 117 #undef  SUBTARGET_EXTRA_SPECS
 118 #define SUBTARGET_EXTRA_SPECS                                           \
 119   { "mingw_include_path", DEFAULT_TARGET_MACHINE }
 120
 121 #undef MATH_LIBRARY
 122 #define MATH_LIBRARY ""
 123
 124 #define SIZE_TYPE "unsigned int"
 125 #define PTRDIFF_TYPE "int"
 126 #define WCHAR_TYPE_SIZE 16
 127 #define WCHAR_TYPE "short unsigned int"
 128
 129 \f
 130 /* Enable parsing of #pragma pack(push,<n>) and #pragma pack(pop).  */
 131 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
 132
 133 union tree_node;
 134 #define TREE union tree_node *
 135 \f
 136 #undef EXTRA_SECTIONS
 137 #define EXTRA_SECTIONS in_drectve
 138
 139 #undef EXTRA_SECTION_FUNCTIONS
 140 #define EXTRA_SECTION_FUNCTIONS                                 \
 141   DRECTVE_SECTION_FUNCTION                                      \
 142   SWITCH_TO_SECTION_FUNCTION
 143
 144 #define DRECTVE_SECTION_FUNCTION \
 145 void                                                                    \
 146 drectve_section (void)                                                  \
 147 {                                                                       \
 148   if (in_section != in_drectve)                                         \
 149     {                                                                   \
 150       fprintf (asm_out_file, "%s\n", "\t.section .drectve\n");          \
 151       in_section = in_drectve;                                          \
 152     }                                                                   \
 153 }
 154 void drectve_section (void);
 155
 156 /* Older versions of gas don't handle 'r' as data.
 157    Explicitly set data flag with 'd'.  */
 158 #define READONLY_DATA_SECTION_ASM_OP "\t.section .rdata,\"dr\""
 159
 160 /* Switch to SECTION (an `enum in_section').
 161
 162    ??? This facility should be provided by GCC proper.
 163    The problem is that we want to temporarily switch sections in
 164    ASM_DECLARE_OBJECT_NAME and then switch back to the original section
 165    afterwards.  */
 166 #define SWITCH_TO_SECTION_FUNCTION                              \
 167 void switch_to_section (enum in_section, tree);                 \
 168 void                                                            \
 169 switch_to_section (enum in_section section, tree decl)          \
 170 {                                                               \
 171   switch (section)                                              \
 172     {                                                           \
 173       case in_text: text_section (); break;                     \
 174       case in_data: data_section (); break;                     \
 175       case in_readonly_data: readonly_data_section (); break;   \
 176       case in_named: named_section (decl, NULL, 0); break;      \
 177       case in_drectve: drectve_section (); break;               \
 178       default: abort (); break;                         \
 179     }                                                           \
 180 }
 181
 182 /* Don't allow flag_pic to propagate since gas may produce invalid code
 183    otherwise.  */
 184
 185 #undef  SUBTARGET_OVERRIDE_OPTIONS
 186 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 187 do {                                                                    \
 188   if (flag_pic)                                                         \
 189     {                                                                   \
 190       warning ("-f%s ignored for target (all code is position independent)",\
 191                (flag_pic > 1) ? "PIC" : "pic");                         \
 192       flag_pic = 0;                                                     \
 193     }                                                                   \
 194 } while (0)                                                             \
 195
 196 /* Define this macro if references to a symbol must be treated
 197    differently depending on something about the variable or
 198    function named by the symbol (such as what section it is in).
 199
 200    On i386 running Windows NT, modify the assembler name with a suffix
 201    consisting of an atsign (@) followed by string of digits that represents
 202    the number of bytes of arguments passed to the function, if it has the
 203    attribute STDCALL.
 204
 205    In addition, we must mark dll symbols specially. Definitions of
 206    dllexport'd objects install some info in the .drectve section.
 207    References to dllimport'd objects are fetched indirectly via
 208    _imp__.  If both are declared, dllexport overrides.  This is also
 209    needed to implement one-only vtables: they go into their own
 210    section and we need to set DECL_SECTION_NAME so we do that here.
 211    Note that we can be called twice on the same decl.  */
 212
 213 #undef TARGET_ENCODE_SECTION_INFO
 214 #define TARGET_ENCODE_SECTION_INFO  i386_pe_encode_section_info
 215 #undef  TARGET_STRIP_NAME_ENCODING
 216 #define TARGET_STRIP_NAME_ENCODING  i386_pe_strip_name_encoding_full
 217 \f
 218 /* Output a reference to a label.  */
 219 #undef ASM_OUTPUT_LABELREF
 220 #define ASM_OUTPUT_LABELREF  i386_pe_output_labelref
 221
 222 /* Output a common block.  */
 223 #undef ASM_OUTPUT_COMMON
 224 #define ASM_OUTPUT_COMMON(STREAM, NAME, SIZE, ROUNDED)  \
 225 do {                                                    \
 226   if (i386_pe_dllexport_name_p (NAME))                  \
 227     i386_pe_record_exported_symbol (NAME, 1);           \
 228   if (! i386_pe_dllimport_name_p (NAME))                \
 229     {                                                   \
 230       fprintf ((STREAM), "\t.comm\t");                  \
 231       assemble_name ((STREAM), (NAME));                 \
 232       fprintf ((STREAM), ", %d\t%s %d\n",               \
 233                (int)(ROUNDED), ASM_COMMENT_START, (int)(SIZE)); \
 234     }                                                   \
 235 } while (0)
 236
 237 /* Output the label for an initialized variable.  */
 238 #undef ASM_DECLARE_OBJECT_NAME
 239 #define ASM_DECLARE_OBJECT_NAME(STREAM, NAME, DECL)     \
 240 do {                                                    \
 241   if (i386_pe_dllexport_name_p (NAME))                  \
 242     i386_pe_record_exported_symbol (NAME, 1);           \
 243   ASM_OUTPUT_LABEL ((STREAM), (NAME));                  \
 244 } while (0)
 245
 246 \f
 247 /* Emit code to check the stack when allocating more that 4000
 248    bytes in one go.  */
 249
 250 #define CHECK_STACK_LIMIT 4000
 251
 252 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 253    returns float values in the 387 and needs stack probes.
 254    We also align doubles to 64-bits for MSVC default compatibility.  */
 255
 256 #undef TARGET_SUBTARGET_DEFAULT
 257 #define TARGET_SUBTARGET_DEFAULT \
 258    (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_STACK_PROBE \
 259     | MASK_ALIGN_DOUBLE)
 260
 261 /* This is how to output an assembler line
 262    that says to advance the location counter
 263    to a multiple of 2**LOG bytes.  */
 264
 265 #undef ASM_OUTPUT_ALIGN
 266 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 267     if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
 268
 269 /* Define this macro if in some cases global symbols from one translation
 270    unit may not be bound to undefined symbols in another translation unit
 271    without user intervention.  For instance, under Microsoft Windows
 272    symbols must be explicitly imported from shared libraries (DLLs).  */
 273 #define MULTIPLE_SYMBOL_SPACES
 274
 275 extern void i386_pe_unique_section (TREE, int);
 276 #define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section
 277
 278 #define SUPPORTS_ONE_ONLY 1
 279
 280 /* Switch into a generic section.  */
 281 #define TARGET_ASM_NAMED_SECTION  i386_pe_asm_named_section
 282
 283 /* Select attributes for named sections.  */
 284 #define TARGET_SECTION_TYPE_FLAGS  i386_pe_section_type_flags
 285
 286 /* Write the extra assembler code needed to declare a function
 287    properly.  If we are generating SDB debugging information, this
 288    will happen automatically, so we only need to handle other cases.  */
 289 #undef ASM_DECLARE_FUNCTION_NAME
 290 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 291   do                                                                    \
 292     {                                                                   \
 293       if (i386_pe_dllexport_name_p (NAME))                              \
 294         i386_pe_record_exported_symbol (NAME, 0);                       \
 295       if (write_symbols != SDB_DEBUG)                                   \
 296         i386_pe_declare_function_type (FILE, NAME, TREE_PUBLIC (DECL)); \
 297       ASM_OUTPUT_LABEL (FILE, NAME);                                    \
 298     }                                                                   \
 299   while (0)
 300
 301 /* Add an external function to the list of functions to be declared at
 302    the end of the file.  */
 303 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 304   do                                                                    \
 305     {                                                                   \
 306       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 307         i386_pe_record_external_function (NAME);                        \
 308     }                                                                   \
 309   while (0)
 310
 311 /* Declare the type properly for any external libcall.  */
 312 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
 313   i386_pe_declare_function_type (FILE, XSTR (FUN, 0), 1)
 314
 315 /* This says out to put a global symbol in the BSS section.  */
 316 #undef ASM_OUTPUT_ALIGNED_BSS
 317 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 318   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 319
 320 /* Output function declarations at the end of the file.  */
 321 #undef TARGET_ASM_FILE_END
 322 #define TARGET_ASM_FILE_END i386_pe_file_end
 323
 324 #undef ASM_COMMENT_START
 325 #define ASM_COMMENT_START " #"
 326
 327 /* DWARF2 Unwinding doesn't work with exception handling yet.  To make
 328    it work, we need to build a libgcc_s.dll, and dcrt0.o should be
 329    changed to call __register_frame_info/__deregister_frame_info.  */
 330 #define DWARF2_UNWIND_INFO 0
 331
 332 /* Don't assume anything about the header files.  */
 333 #define NO_IMPLICIT_EXTERN_C
 334
 335 #undef PROFILE_HOOK
 336 #define PROFILE_HOOK(LABEL)                                             \
 337   if (MAIN_NAME_P (DECL_NAME (current_function_decl)))                  \
 338     {                                                                   \
 339       emit_call_insn (gen_rtx_CALL (VOIDmode,                           \
 340         gen_rtx_MEM (FUNCTION_MODE,                                     \
 341                      gen_rtx_SYMBOL_REF (Pmode, "_monstartup")),        \
 342         const0_rtx));                                                   \
 343     }
 344
 345 /* Java Native Interface (JNI) methods on Win32 are invoked using the
 346    stdcall calling convention.  */
 347 #undef MODIFY_JNI_METHOD_CALL
 348 #define MODIFY_JNI_METHOD_CALL(MDECL)                                         \
 349   build_type_attribute_variant ((MDECL),                                      \
 350                                build_tree_list (get_identifier ("stdcall"),   \
 351                                                 NULL))
 352
 353 /* External function declarations.  */
 354
 355 extern void i386_pe_record_external_function (const char *);
 356 extern void i386_pe_declare_function_type (FILE *, const char *, int);
 357 extern void i386_pe_record_exported_symbol (const char *, int);
 358 extern void i386_pe_file_end (void);
 359 extern int i386_pe_dllexport_name_p (const char *);
 360 extern int i386_pe_dllimport_name_p (const char *);
 361
 362 /* For Win32 ABI compatibility */
 363 #undef DEFAULT_PCC_STRUCT_RETURN
 364 #define DEFAULT_PCC_STRUCT_RETURN 0
 365
 366 /* MSVC returns aggregate types of up to 8 bytes via registers.
 367    See i386.c:ix86_return_in_memory.  */
 368 #undef MS_AGGREGATE_RETURN
 369 #define MS_AGGREGATE_RETURN 1
 370
 371 /* No data type wants to be aligned rounder than this.  */
 372 #undef  BIGGEST_ALIGNMENT
 373 #define BIGGEST_ALIGNMENT 128
 374
 375 /* Native complier aligns internal doubles in structures on dword boundaries.  */
 376 #undef  BIGGEST_FIELD_ALIGNMENT
 377 #define BIGGEST_FIELD_ALIGNMENT 64
 378
 379 /* A bit-field declared as `int' forces `int' alignment for the struct.  */
 380 #undef PCC_BITFIELD_TYPE_MATTERS
 381 #define PCC_BITFIELD_TYPE_MATTERS 1
 382 #define GROUP_BITFIELDS_BY_ALIGN TYPE_NATIVE(rec)
 383
 384 /* Enable alias attribute support.  */
 385 #ifndef SET_ASM_OP
 386 #define SET_ASM_OP "\t.set\t"
 387 #endif
 388 /* This implements the `alias' attribute, keeping any stdcall or
 389    fastcall decoration.  */
 390 #undef  ASM_OUTPUT_DEF_FROM_DECLS
 391 #define ASM_OUTPUT_DEF_FROM_DECLS(STREAM, DECL, TARGET)                 \
 392   do                                                                    \
 393     {                                                                   \
 394       const char *alias;                                                \
 395       rtx rtlname = XEXP (DECL_RTL (DECL), 0);                          \
 396       if (GET_CODE (rtlname) == SYMBOL_REF)                             \
 397         alias = XSTR (rtlname, 0);                                      \
 398       else                                                              \
 399         abort ();                                                       \
 400       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 401         i386_pe_declare_function_type (STREAM, alias,                   \
 402                                        TREE_PUBLIC (DECL));             \
 403       ASM_OUTPUT_DEF (STREAM, alias, IDENTIFIER_POINTER (TARGET));      \
 404     } while (0)
 405
 406 /* Decide whether it is safe to use a local alias for a virtual function
 407    when constructing thunks.  */
 408 #undef TARGET_USE_LOCAL_THUNK_ALIAS_P
 409 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) (!DECL_ONE_ONLY (DECL))
 410
 411 #undef TREE
 412
 413 #ifndef BUFSIZ
 414 # undef FILE
 415 #endif