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) 1995-2021 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 #if TARGET_64BIT_DEFAULT || defined (HAVE_GAS_PE_SECREL32_RELOC) 23 #define DWARF2_DEBUGGING_INFO 1 24 #endif 25 26 #undef PREFERRED_DEBUGGING_TYPE 27 #if (DWARF2_DEBUGGING_INFO) 28 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG 29 #else 30 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG 31 #endif 32 33 #undef TARGET_SEH 34 #define TARGET_SEH (TARGET_64BIT_MS_ABI && flag_unwind_tables) 35 36 /* Win64 with SEH cannot represent DRAP stack frames. Disable its use. 37 Force the use of different mechanisms to allocate aligned local data. */ 38 #undef MAX_STACK_ALIGNMENT 39 #define MAX_STACK_ALIGNMENT (TARGET_SEH ? 128 : MAX_OFILE_ALIGNMENT) 40 41 /* 32-bit Windows aligns the stack on a 4-byte boundary but SSE instructions 42 may require 16-byte alignment. */ 43 #undef STACK_REALIGN_DEFAULT 44 #define STACK_REALIGN_DEFAULT TARGET_SSE 45 46 /* Support hooks for SEH. */ 47 #undef TARGET_ASM_UNWIND_EMIT 48 #define TARGET_ASM_UNWIND_EMIT i386_pe_seh_unwind_emit 49 #undef TARGET_ASM_UNWIND_EMIT_BEFORE_INSN 50 #define TARGET_ASM_UNWIND_EMIT_BEFORE_INSN false 51 #undef TARGET_ASM_FUNCTION_END_PROLOGUE 52 #define TARGET_ASM_FUNCTION_END_PROLOGUE i386_pe_seh_end_prologue 53 #undef TARGET_ASM_EMIT_EXCEPT_PERSONALITY 54 #define TARGET_ASM_EMIT_EXCEPT_PERSONALITY i386_pe_seh_emit_except_personality 55 #undef TARGET_ASM_INIT_SECTIONS 56 #define TARGET_ASM_INIT_SECTIONS i386_pe_seh_init_sections 57 #define SUBTARGET_ASM_UNWIND_INIT i386_pe_seh_init 58 59 #undef DEFAULT_ABI 60 #define DEFAULT_ABI (TARGET_64BIT ? MS_ABI : SYSV_ABI) 61 62 #undef TARGET_PECOFF 63 #define TARGET_PECOFF 1 64 65 #if ! defined (USE_MINGW64_LEADING_UNDERSCORES) 66 #undef USER_LABEL_PREFIX 67 #define USER_LABEL_PREFIX (TARGET_64BIT ? "" : "_") 68 69 #undef LOCAL_LABEL_PREFIX 70 #define LOCAL_LABEL_PREFIX (TARGET_64BIT ? "." : "") 71 72 #undef ASM_GENERATE_INTERNAL_LABEL 73 #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER) \ 74 sprintf ((BUF), "*%s%s%ld", LOCAL_LABEL_PREFIX, \ 75 (PREFIX), (long)(NUMBER)) 76 77 #undef LPREFIX 78 #define LPREFIX (TARGET_64BIT ? ".L" : "L") 79 80 #endif 81 82 #undef DBX_REGISTER_NUMBER 83 #define DBX_REGISTER_NUMBER(n) \ 84 (TARGET_64BIT ? dbx64_register_map[n] \ 85 : (write_symbols == DWARF2_DEBUG \ 86 ? svr4_dbx_register_map[n] : dbx_register_map[n])) 87 88 /* Map gcc register number to DWARF 2 CFA column number. For 32 bit 89 target, always use the svr4_dbx_register_map for DWARF .eh_frame 90 even if we don't use DWARF .debug_frame. */ 91 #undef DWARF_FRAME_REGNUM 92 #define DWARF_FRAME_REGNUM(n) \ 93 (TARGET_64BIT ? dbx64_register_map[(n)] \ 94 : svr4_dbx_register_map[(n)]) 95 96 /* The 64-bit MS_ABI changes the set of call-used registers. */ 97 #undef DWARF_FRAME_REGISTERS 98 #define DWARF_FRAME_REGISTERS (TARGET_64BIT ? 33 : 17) 99 100 #ifdef HAVE_GAS_PE_SECREL32_RELOC 101 /* Use section relative relocations for debugging offsets. Unlike 102 other targets that fake this by putting the section VMA at 0, PE 103 won't allow it. */ 104 #define ASM_OUTPUT_DWARF_OFFSET(FILE, SIZE, LABEL, OFFSET, SECTION) \ 105 do { \ 106 switch (SIZE) \ 107 { \ 108 case 4: \ 109 fputs ("\t.secrel32\t", FILE); \ 110 assemble_name (FILE, LABEL); \ 111 if ((OFFSET) != 0) \ 112 fprintf (FILE, "+" HOST_WIDE_INT_PRINT_DEC, \ 113 (HOST_WIDE_INT) (OFFSET)); \ 114 break; \ 115 case 8: \ 116 /* This is a hack. There is no 64-bit section relative \ 117 relocation. However, the COFF format also does not \ 118 support 64-bit file offsets; 64-bit applications are \ 119 limited to 32-bits of code+data in any one module. \ 120 Fake the 64-bit offset by zero-extending it. */ \ 121 fputs ("\t.secrel32\t", FILE); \ 122 assemble_name (FILE, LABEL); \ 123 if ((OFFSET) != 0) \ 124 fprintf (FILE, "+" HOST_WIDE_INT_PRINT_DEC, \ 125 (HOST_WIDE_INT) (OFFSET)); \ 126 fputs ("\n\t.long\t0", FILE); \ 127 break; \ 128 default: \ 129 gcc_unreachable (); \ 130 } \ 131 } while (0) 132 #endif 133 134 #define TARGET_EXECUTABLE_SUFFIX ".exe" 135 136 #define TARGET_OS_CPP_BUILTINS() \ 137 do \ 138 { \ 139 if (!TARGET_64BIT) \ 140 builtin_define ("_X86_=1"); \ 141 if (TARGET_SEH) \ 142 builtin_define ("__SEH__"); \ 143 builtin_assert ("system=winnt"); \ 144 builtin_define ("__stdcall=__attribute__((__stdcall__))"); \ 145 builtin_define ("__fastcall=__attribute__((__fastcall__))"); \ 146 builtin_define ("__thiscall=__attribute__((__thiscall__))"); \ 147 builtin_define ("__cdecl=__attribute__((__cdecl__))"); \ 148 if (!flag_iso) \ 149 { \ 150 builtin_define ("_stdcall=__attribute__((__stdcall__))"); \ 151 builtin_define ("_fastcall=__attribute__((__fastcall__))"); \ 152 builtin_define ("_thiscall=__attribute__((__thiscall__))"); \ 153 builtin_define ("_cdecl=__attribute__((__cdecl__))"); \ 154 } \ 155 /* Even though linkonce works with static libs, this is needed \ 156 to compare typeinfo symbols across dll boundaries. */ \ 157 builtin_define ("__GXX_MERGED_TYPEINFO_NAMES=0"); \ 158 builtin_define ("__GXX_TYPEINFO_EQUALITY_INLINE=0"); \ 159 EXTRA_OS_CPP_BUILTINS (); \ 160 } \ 161 while (0) 162 163 /* Get tree.c to declare a target-specific specialization of 164 merge_decl_attributes. */ 165 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 1 166 167 /* This macro defines names of additional specifications to put in the specs 168 that can be used in various specifications like CC1_SPEC. Its definition 169 is an initializer with a subgrouping for each command option. 170 171 Each subgrouping contains a string constant, that defines the 172 specification name, and a string constant that used by the GCC driver 173 program. 174 175 Do not define this macro if it does not need to do anything. */ 176 177 #undef SUBTARGET_EXTRA_SPECS 178 #define SUBTARGET_EXTRA_SPECS \ 179 { "mingw_include_path", DEFAULT_TARGET_MACHINE } 180 181 #undef MATH_LIBRARY 182 #define MATH_LIBRARY "" 183 184 #undef TARGET_LIBC_HAS_FUNCTION 185 #define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function 186 187 #define SIZE_TYPE (TARGET_64BIT ? "long long unsigned int" : "unsigned int") 188 #define PTRDIFF_TYPE (TARGET_64BIT ? "long long int" : "int") 189 190 #define WCHAR_TYPE_SIZE 16 191 #define WCHAR_TYPE "short unsigned int" 192 193 /* Windows64 continues to use a 32-bit long type. */ 194 #undef LONG_TYPE_SIZE 195 #define LONG_TYPE_SIZE 32 196 197 #define drectve_section() \ 198 (fprintf (asm_out_file, "\t.section .drectve\n"), \ 199 in_section = NULL) 200 201 /* Older versions of gas don't handle 'r' as data. 202 Explicitly set data flag with 'd'. */ 203 #define READONLY_DATA_SECTION_ASM_OP "\t.section .rdata,\"dr\"" 204 205 /* Don't allow flag_pic to propagate since gas may produce invalid code 206 otherwise. */ 207 208 #undef SUBTARGET_OVERRIDE_OPTIONS 209 #define SUBTARGET_OVERRIDE_OPTIONS \ 210 do { \ 211 flag_pic = TARGET_64BIT ? 1 : 0; \ 212 } while (0) 213 214 /* Define this macro if references to a symbol must be treated 215 differently depending on something about the variable or 216 function named by the symbol (such as what section it is in). 217 218 On i386 running Windows NT, modify the assembler name with a suffix 219 consisting of an atsign (@) followed by string of digits that represents 220 the number of bytes of arguments passed to the function, if it has the 221 attribute STDCALL. 222 223 In addition, we must mark dll symbols specially. Definitions of 224 dllexport'd objects install some info in the .drectve section. 225 References to dllimport'd objects are fetched indirectly via 226 _imp__. If both are declared, dllexport overrides. This is also 227 needed to implement one-only vtables: they go into their own 228 section and we need to set DECL_SECTION_NAME so we do that here. 229 Note that we can be called twice on the same decl. */ 230 231 #define SUBTARGET_ENCODE_SECTION_INFO i386_pe_encode_section_info 232 233 /* Local and global relocs can be placed always into readonly memory 234 for PE-COFF targets. */ 235 #undef TARGET_ASM_RELOC_RW_MASK 236 #define TARGET_ASM_RELOC_RW_MASK i386_pe_reloc_rw_mask 237 238 /* Output a common block. */ 239 #undef ASM_OUTPUT_ALIGNED_DECL_COMMON 240 #define ASM_OUTPUT_ALIGNED_DECL_COMMON \ 241 i386_pe_asm_output_aligned_decl_common 242 243 /* Output the label for an initialized variable. */ 244 #undef ASM_DECLARE_OBJECT_NAME 245 #define ASM_DECLARE_OBJECT_NAME(STREAM, NAME, DECL) \ 246 do { \ 247 i386_pe_maybe_record_exported_symbol (DECL, NAME, 1); \ 248 ASM_OUTPUT_LABEL ((STREAM), (NAME)); \ 249 } while (0) 250 251 /* Output a reference to a label. Fastcall function symbols 252 keep their '@' prefix, while other symbols are prefixed 253 with user_label_prefix. */ 254 #undef ASM_OUTPUT_LABELREF 255 #define ASM_OUTPUT_LABELREF(STREAM, NAME) \ 256 do { \ 257 if ((NAME)[0] != FASTCALL_PREFIX) \ 258 fputs (user_label_prefix, (STREAM)); \ 259 fputs ((NAME), (STREAM)); \ 260 } while (0) 261 262 /* This does much the same in memory rather than to a stream. */ 263 #undef TARGET_MANGLE_ASSEMBLER_NAME 264 #define TARGET_MANGLE_ASSEMBLER_NAME i386_pe_mangle_assembler_name 265 266 267 /* Emit code to check the stack when allocating more than 4000 268 bytes in one go. */ 269 #define CHECK_STACK_LIMIT 4000 270 271 /* By default, target has a 80387, uses IEEE compatible arithmetic, 272 returns float values in the 387 and needs stack probes. 273 We also align doubles to 64-bits for MSVC default compatibility. */ 274 275 #undef TARGET_SUBTARGET_DEFAULT 276 #define TARGET_SUBTARGET_DEFAULT \ 277 (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS \ 278 | MASK_STACK_PROBE | MASK_ALIGN_DOUBLE) 279 280 #undef TARGET_SUBTARGET64_DEFAULT 281 #define TARGET_SUBTARGET64_DEFAULT \ 282 MASK_128BIT_LONG_DOUBLE 283 284 /* This is how to output an assembler line 285 that says to advance the location counter 286 to a multiple of 2**LOG bytes. */ 287 288 #undef ASM_OUTPUT_ALIGN 289 #define ASM_OUTPUT_ALIGN(FILE,LOG) \ 290 if ((LOG) != 0) fprintf ((FILE), "\t.align %d\n", 1 << (LOG)) 291 292 /* Windows uses explicit import from shared libraries. */ 293 #define MULTIPLE_SYMBOL_SPACES 1 294 295 #define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section 296 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section 297 298 #define SUPPORTS_ONE_ONLY 1 299 300 /* Switch into a generic section. */ 301 #define TARGET_ASM_NAMED_SECTION i386_pe_asm_named_section 302 303 /* Select attributes for named sections. */ 304 #define TARGET_SECTION_TYPE_FLAGS i386_pe_section_type_flags 305 306 /* Write the extra assembler code needed to declare a function 307 properly. */ 308 #undef ASM_DECLARE_FUNCTION_NAME 309 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \ 310 i386_pe_start_function (FILE, NAME, DECL) 311 312 /* Write the extra assembler code needed to declare the name of a 313 cold function partition properly. */ 314 315 #undef ASM_DECLARE_COLD_FUNCTION_NAME 316 #define ASM_DECLARE_COLD_FUNCTION_NAME(FILE, NAME, DECL) \ 317 do \ 318 { \ 319 i386_pe_declare_function_type (FILE, NAME, 0); \ 320 i386_pe_seh_cold_init (FILE, NAME); \ 321 ASM_OUTPUT_LABEL (FILE, NAME); \ 322 } \ 323 while (0) 324 325 #undef ASM_DECLARE_FUNCTION_SIZE 326 #define ASM_DECLARE_FUNCTION_SIZE(FILE,NAME,DECL) \ 327 i386_pe_end_function (FILE, NAME, DECL) 328 329 #undef ASM_DECLARE_COLD_FUNCTION_SIZE 330 #define ASM_DECLARE_COLD_FUNCTION_SIZE(FILE,NAME,DECL) \ 331 i386_pe_end_cold_function (FILE, NAME, DECL) 332 333 /* Add an external function to the list of functions to be declared at 334 the end of the file. */ 335 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \ 336 do \ 337 { \ 338 if (TREE_CODE (DECL) == FUNCTION_DECL) \ 339 i386_pe_record_external_function ((DECL), (NAME)); \ 340 } \ 341 while (0) 342 343 /* Declare the type properly for any external libcall. */ 344 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \ 345 i386_pe_declare_function_type (FILE, XSTR (FUN, 0), 1) 346 347 /* This says out to put a global symbol in the BSS section. */ 348 #undef ASM_OUTPUT_ALIGNED_BSS 349 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ 350 asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN)) 351 352 /* Output function declarations at the end of the file. */ 353 #undef TARGET_ASM_FILE_END 354 #define TARGET_ASM_FILE_END i386_pe_file_end 355 356 /* Kludge because of missing PE-COFF support for early LTO debug. */ 357 #undef TARGET_ASM_LTO_START 358 #define TARGET_ASM_LTO_START i386_pe_asm_lto_start 359 #undef TARGET_ASM_LTO_END 360 #define TARGET_ASM_LTO_END i386_pe_asm_lto_end 361 362 #undef ASM_COMMENT_START 363 #define ASM_COMMENT_START " #" 364 365 #ifndef DWARF2_UNWIND_INFO 366 /* If configured with --disable-sjlj-exceptions, use DWARF2 for 32-bit 367 mode else default to SJLJ. 64-bit code uses SEH unless you request 368 SJLJ. */ 369 #if (defined (CONFIG_SJLJ_EXCEPTIONS) && !CONFIG_SJLJ_EXCEPTIONS) 370 /* The logic of this #if must be kept synchronised with the logic 371 for selecting the tmake_eh_file fragment in libgcc/config.host. */ 372 #define DWARF2_UNWIND_INFO 1 373 #else 374 #define DWARF2_UNWIND_INFO 0 375 #endif 376 #endif 377 378 #undef PROFILE_HOOK 379 #define PROFILE_HOOK(LABEL) \ 380 if (MAIN_NAME_P (DECL_NAME (current_function_decl))) \ 381 { \ 382 emit_call_insn (gen_rtx_CALL (VOIDmode, \ 383 gen_rtx_MEM (FUNCTION_MODE, \ 384 gen_rtx_SYMBOL_REF (Pmode, "_monstartup")), \ 385 const0_rtx)); \ 386 } 387 388 /* For Win32 ABI compatibility */ 389 #undef DEFAULT_PCC_STRUCT_RETURN 390 #define DEFAULT_PCC_STRUCT_RETURN 0 391 392 /* MSVC returns aggregate types of up to 8 bytes via registers. 393 See i386.c:ix86_return_in_memory. */ 394 #undef MS_AGGREGATE_RETURN 395 #define MS_AGGREGATE_RETURN 1 396 397 /* Biggest alignment supported by the object file format of this 398 machine. Use this macro to limit the alignment which can be 399 specified using the `__attribute__ ((aligned (N)))' construct. If 400 not defined, the default value is `BIGGEST_ALIGNMENT'. */ 401 /* IMAGE_SCN_ALIGN_8192BYTES is the largest section alignment flag 402 specified in the PECOFF60 spec. Native MS compiler also limits 403 user-specified alignment to 8192 bytes. */ 404 #undef MAX_OFILE_ALIGNMENT 405 #define MAX_OFILE_ALIGNMENT (8192 * 8) 406 407 /* BIGGEST_FIELD_ALIGNMENT macro is used directly by libobjc, There, we 408 align internal doubles in structures on dword boundaries. Otherwise, 409 support vector modes using ADJUST_FIELD_ALIGN, defined in i386.h. */ 410 #ifdef IN_TARGET_LIBS 411 #undef BIGGEST_FIELD_ALIGNMENT 412 #define BIGGEST_FIELD_ALIGNMENT 64 413 #endif 414 415 /* Enable alias attribute support. */ 416 #ifndef SET_ASM_OP 417 #define SET_ASM_OP "\t.set\t" 418 #endif 419 420 /* This implements the `alias' attribute, keeping any stdcall or 421 fastcall decoration. */ 422 #undef ASM_OUTPUT_DEF_FROM_DECLS 423 #define ASM_OUTPUT_DEF_FROM_DECLS(STREAM, DECL, TARGET) \ 424 do \ 425 { \ 426 const char *alias \ 427 = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL)); \ 428 i386_pe_maybe_record_exported_symbol (DECL, alias, 0); \ 429 if (TREE_CODE (DECL) == FUNCTION_DECL) \ 430 i386_pe_declare_function_type (STREAM, alias, \ 431 TREE_PUBLIC (DECL)); \ 432 ASM_OUTPUT_DEF (STREAM, alias, IDENTIFIER_POINTER (TARGET)); \ 433 } while (0) 434 435 /* GNU as supports weak symbols on PECOFF. */ 436 #ifdef HAVE_GAS_WEAK 437 #define ASM_WEAKEN_LABEL(FILE, NAME) \ 438 do \ 439 { \ 440 fputs ("\t.weak\t", (FILE)); \ 441 assemble_name ((FILE), (NAME)); \ 442 fputc ('\n', (FILE)); \ 443 } \ 444 while (0) 445 446 #endif /* HAVE_GAS_WEAK */ 447 448 /* Decide whether it is safe to use a local alias for a virtual function 449 when constructing thunks. */ 450 #undef TARGET_USE_LOCAL_THUNK_ALIAS_P 451 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) (!DECL_ONE_ONLY (DECL)) 452 453 #define SUBTARGET_ATTRIBUTE_TABLE \ 454 { "selectany", 0, 0, true, false, false, false, \ 455 ix86_handle_selectany_attribute, NULL } 456 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, 457 affects_type_identity, handler, exclude } */ 458 459 /* mcount() does not need a counter variable. */ 460 #undef NO_PROFILE_COUNTERS 461 #define NO_PROFILE_COUNTERS 1 462 463 #define TARGET_VALID_DLLIMPORT_ATTRIBUTE_P i386_pe_valid_dllimport_attribute_p 464 #define TARGET_CXX_ADJUST_CLASS_AT_DEFINITION i386_pe_adjust_class_at_definition 465 #define SUBTARGET_MANGLE_DECL_ASSEMBLER_NAME i386_pe_mangle_decl_assembler_name 466 467 #undef TARGET_ASM_ASSEMBLE_VISIBILITY 468 #define TARGET_ASM_ASSEMBLE_VISIBILITY i386_pe_assemble_visibility 469 470 #undef SUB_TARGET_RECORD_STUB 471 #define SUB_TARGET_RECORD_STUB i386_pe_record_stub 472 473 /* Static stack checking is supported by means of probes. */ 474 #define STACK_CHECK_STATIC_BUILTIN 1 475 476 #ifndef HAVE_GAS_ALIGNED_COMM 477 # define HAVE_GAS_ALIGNED_COMM 0 478 #endif 479