compiler-rt/lib/sanitizer_common/sanitizer_win.cpp

   1 //===-- sanitizer_win.cpp -------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file is shared between AddressSanitizer and ThreadSanitizer
  10 // run-time libraries and implements windows-specific functions from
  11 // sanitizer_libc.h.
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "sanitizer_platform.h"
  15 #if SANITIZER_WINDOWS
  16
  17 #define WIN32_LEAN_AND_MEAN
  18 #define NOGDI
  19 #include <windows.h>
  20 #include <io.h>
  21 #include <psapi.h>
  22 #include <stdlib.h>
  23
  24 #include "sanitizer_common.h"
  25 #include "sanitizer_file.h"
  26 #include "sanitizer_libc.h"
  27 #include "sanitizer_mutex.h"
  28 #include "sanitizer_placement_new.h"
  29 #include "sanitizer_win_defs.h"
  30
  31 #if defined(PSAPI_VERSION) && PSAPI_VERSION == 1
  32 #pragma comment(lib, "psapi")
  33 #endif
  34 #if SANITIZER_WIN_TRACE
  35 #include <traceloggingprovider.h>
  36 //  Windows trace logging provider init
  37 #pragma comment(lib, "advapi32.lib")
  38 TRACELOGGING_DECLARE_PROVIDER(g_asan_provider);
  39 // GUID must be the same in utils/AddressSanitizerLoggingProvider.wprp
  40 TRACELOGGING_DEFINE_PROVIDER(g_asan_provider, "AddressSanitizerLoggingProvider",
  41                              (0x6c6c766d, 0x3846, 0x4e6a, 0xa4, 0xfb, 0x5b,
  42                               0x53, 0x0b, 0xd0, 0xf3, 0xfa));
  43 #else
  44 #define TraceLoggingUnregister(x)
  45 #endif
  46
  47 // For WaitOnAddress
  48 #  pragma comment(lib, "synchronization.lib")
  49
  50 // A macro to tell the compiler that this part of the code cannot be reached,
  51 // if the compiler supports this feature. Since we're using this in
  52 // code that is called when terminating the process, the expansion of the
  53 // macro should not terminate the process to avoid infinite recursion.
  54 #if defined(__clang__)
  55 # define BUILTIN_UNREACHABLE() __builtin_unreachable()
  56 #elif defined(__GNUC__) && \
  57     (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5))
  58 # define BUILTIN_UNREACHABLE() __builtin_unreachable()
  59 #elif defined(_MSC_VER)
  60 # define BUILTIN_UNREACHABLE() __assume(0)
  61 #else
  62 # define BUILTIN_UNREACHABLE()
  63 #endif
  64
  65 namespace __sanitizer {
  66
  67 #include "sanitizer_syscall_generic.inc"
  68
  69 // --------------------- sanitizer_common.h
  70 uptr GetPageSize() {
  71   SYSTEM_INFO si;
  72   GetSystemInfo(&si);
  73   return si.dwPageSize;
  74 }
  75
  76 uptr GetMmapGranularity() {
  77   SYSTEM_INFO si;
  78   GetSystemInfo(&si);
  79   return si.dwAllocationGranularity;
  80 }
  81
  82 uptr GetMaxUserVirtualAddress() {
  83   SYSTEM_INFO si;
  84   GetSystemInfo(&si);
  85   return (uptr)si.lpMaximumApplicationAddress;
  86 }
  87
  88 uptr GetMaxVirtualAddress() {
  89   return GetMaxUserVirtualAddress();
  90 }
  91
  92 bool FileExists(const char *filename) {
  93   return ::GetFileAttributesA(filename) != INVALID_FILE_ATTRIBUTES;
  94 }
  95
  96 bool DirExists(const char *path) {
  97   auto attr = ::GetFileAttributesA(path);
  98   return (attr != INVALID_FILE_ATTRIBUTES) && (attr & FILE_ATTRIBUTE_DIRECTORY);
  99 }
 100
 101 uptr internal_getpid() {
 102   return GetProcessId(GetCurrentProcess());
 103 }
 104
 105 int internal_dlinfo(void *handle, int request, void *p) {
 106   UNIMPLEMENTED();
 107 }
 108
 109 // In contrast to POSIX, on Windows GetCurrentThreadId()
 110 // returns a system-unique identifier.
 111 tid_t GetTid() {
 112   return GetCurrentThreadId();
 113 }
 114
 115 uptr GetThreadSelf() {
 116   return GetTid();
 117 }
 118
 119 #if !SANITIZER_GO
 120 void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top,
 121                                 uptr *stack_bottom) {
 122   CHECK(stack_top);
 123   CHECK(stack_bottom);
 124   MEMORY_BASIC_INFORMATION mbi;
 125   CHECK_NE(VirtualQuery(&mbi /* on stack */, &mbi, sizeof(mbi)), 0);
 126   // FIXME: is it possible for the stack to not be a single allocation?
 127   // Are these values what ASan expects to get (reserved, not committed;
 128   // including stack guard page) ?
 129   *stack_top = (uptr)mbi.BaseAddress + mbi.RegionSize;
 130   *stack_bottom = (uptr)mbi.AllocationBase;
 131 }
 132 #endif  // #if !SANITIZER_GO
 133
 134 bool ErrorIsOOM(error_t err) {
 135   // TODO: This should check which `err`s correspond to OOM.
 136   return false;
 137 }
 138
 139 void *MmapOrDie(uptr size, const char *mem_type, bool raw_report) {
 140   void *rv = VirtualAlloc(0, size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
 141   if (rv == 0)
 142     ReportMmapFailureAndDie(size, mem_type, "allocate",
 143                             GetLastError(), raw_report);
 144   return rv;
 145 }
 146
 147 void UnmapOrDie(void *addr, uptr size) {
 148   if (!size || !addr)
 149     return;
 150
 151   MEMORY_BASIC_INFORMATION mbi;
 152   CHECK(VirtualQuery(addr, &mbi, sizeof(mbi)));
 153
 154   // MEM_RELEASE can only be used to unmap whole regions previously mapped with
 155   // VirtualAlloc. So we first try MEM_RELEASE since it is better, and if that
 156   // fails try MEM_DECOMMIT.
 157   if (VirtualFree(addr, 0, MEM_RELEASE) == 0) {
 158     if (VirtualFree(addr, size, MEM_DECOMMIT) == 0) {
 159       Report("ERROR: %s failed to "
 160              "deallocate 0x%zx (%zd) bytes at address %p (error code: %d)\n",
 161              SanitizerToolName, size, size, addr, GetLastError());
 162       CHECK("unable to unmap" && 0);
 163     }
 164   }
 165 }
 166
 167 static void *ReturnNullptrOnOOMOrDie(uptr size, const char *mem_type,
 168                                      const char *mmap_type) {
 169   error_t last_error = GetLastError();
 170   if (last_error == ERROR_NOT_ENOUGH_MEMORY)
 171     return nullptr;
 172   ReportMmapFailureAndDie(size, mem_type, mmap_type, last_error);
 173 }
 174
 175 void *MmapOrDieOnFatalError(uptr size, const char *mem_type) {
 176   void *rv = VirtualAlloc(0, size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
 177   if (rv == 0)
 178     return ReturnNullptrOnOOMOrDie(size, mem_type, "allocate");
 179   return rv;
 180 }
 181
 182 // We want to map a chunk of address space aligned to 'alignment'.
 183 void *MmapAlignedOrDieOnFatalError(uptr size, uptr alignment,
 184                                    const char *mem_type) {
 185   CHECK(IsPowerOfTwo(size));
 186   CHECK(IsPowerOfTwo(alignment));
 187
 188   // Windows will align our allocations to at least 64K.
 189   alignment = Max(alignment, GetMmapGranularity());
 190
 191   uptr mapped_addr =
 192       (uptr)VirtualAlloc(0, size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
 193   if (!mapped_addr)
 194     return ReturnNullptrOnOOMOrDie(size, mem_type, "allocate aligned");
 195
 196   // If we got it right on the first try, return. Otherwise, unmap it and go to
 197   // the slow path.
 198   if (IsAligned(mapped_addr, alignment))
 199     return (void*)mapped_addr;
 200   if (VirtualFree((void *)mapped_addr, 0, MEM_RELEASE) == 0)
 201     ReportMmapFailureAndDie(size, mem_type, "deallocate", GetLastError());
 202
 203   // If we didn't get an aligned address, overallocate, find an aligned address,
 204   // unmap, and try to allocate at that aligned address.
 205   int retries = 0;
 206   const int kMaxRetries = 10;
 207   for (; retries < kMaxRetries &&
 208          (mapped_addr == 0 || !IsAligned(mapped_addr, alignment));
 209        retries++) {
 210     // Overallocate size + alignment bytes.
 211     mapped_addr =
 212         (uptr)VirtualAlloc(0, size + alignment, MEM_RESERVE, PAGE_NOACCESS);
 213     if (!mapped_addr)
 214       return ReturnNullptrOnOOMOrDie(size, mem_type, "allocate aligned");
 215
 216     // Find the aligned address.
 217     uptr aligned_addr = RoundUpTo(mapped_addr, alignment);
 218
 219     // Free the overallocation.
 220     if (VirtualFree((void *)mapped_addr, 0, MEM_RELEASE) == 0)
 221       ReportMmapFailureAndDie(size, mem_type, "deallocate", GetLastError());
 222
 223     // Attempt to allocate exactly the number of bytes we need at the aligned
 224     // address. This may fail for a number of reasons, in which case we continue
 225     // the loop.
 226     mapped_addr = (uptr)VirtualAlloc((void *)aligned_addr, size,
 227                                      MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
 228   }
 229
 230   // Fail if we can't make this work quickly.
 231   if (retries == kMaxRetries && mapped_addr == 0)
 232     return ReturnNullptrOnOOMOrDie(size, mem_type, "allocate aligned");
 233
 234   return (void *)mapped_addr;
 235 }
 236
 237 // ZeroMmapFixedRegion zero's out a region of memory previously returned from a
 238 // call to one of the MmapFixed* helpers. On non-windows systems this would be
 239 // done with another mmap, but on windows remapping is not an option.
 240 // VirtualFree(DECOMMIT)+VirtualAlloc(RECOMMIT) would also be a way to zero the
 241 // memory, but we can't do this atomically, so instead we fall back to using
 242 // internal_memset.
 243 bool ZeroMmapFixedRegion(uptr fixed_addr, uptr size) {
 244   internal_memset((void*) fixed_addr, 0, size);
 245   return true;
 246 }
 247
 248 bool MmapFixedNoReserve(uptr fixed_addr, uptr size, const char *name) {
 249   // FIXME: is this really "NoReserve"? On Win32 this does not matter much,
 250   // but on Win64 it does.
 251   (void)name;  // unsupported
 252 #if !SANITIZER_GO && SANITIZER_WINDOWS64
 253   // On asan/Windows64, use MEM_COMMIT would result in error
 254   // 1455:ERROR_COMMITMENT_LIMIT.
 255   // Asan uses exception handler to commit page on demand.
 256   void *p = VirtualAlloc((LPVOID)fixed_addr, size, MEM_RESERVE, PAGE_READWRITE);
 257 #else
 258   void *p = VirtualAlloc((LPVOID)fixed_addr, size, MEM_RESERVE | MEM_COMMIT,
 259                          PAGE_READWRITE);
 260 #endif
 261   if (p == 0) {
 262     Report("ERROR: %s failed to "
 263            "allocate %p (%zd) bytes at %p (error code: %d)\n",
 264            SanitizerToolName, size, size, fixed_addr, GetLastError());
 265     return false;
 266   }
 267   return true;
 268 }
 269
 270 bool MmapFixedSuperNoReserve(uptr fixed_addr, uptr size, const char *name) {
 271   // FIXME: Windows support large pages too. Might be worth checking
 272   return MmapFixedNoReserve(fixed_addr, size, name);
 273 }
 274
 275 // Memory space mapped by 'MmapFixedOrDie' must have been reserved by
 276 // 'MmapFixedNoAccess'.
 277 void *MmapFixedOrDie(uptr fixed_addr, uptr size, const char *name) {
 278   void *p = VirtualAlloc((LPVOID)fixed_addr, size,
 279       MEM_COMMIT, PAGE_READWRITE);
 280   if (p == 0) {
 281     char mem_type[30];
 282     internal_snprintf(mem_type, sizeof(mem_type), "memory at address 0x%zx",
 283                       fixed_addr);
 284     ReportMmapFailureAndDie(size, mem_type, "allocate", GetLastError());
 285   }
 286   return p;
 287 }
 288
 289 // Uses fixed_addr for now.
 290 // Will use offset instead once we've implemented this function for real.
 291 uptr ReservedAddressRange::Map(uptr fixed_addr, uptr size, const char *name) {
 292   return reinterpret_cast<uptr>(MmapFixedOrDieOnFatalError(fixed_addr, size));
 293 }
 294
 295 uptr ReservedAddressRange::MapOrDie(uptr fixed_addr, uptr size,
 296                                     const char *name) {
 297   return reinterpret_cast<uptr>(MmapFixedOrDie(fixed_addr, size));
 298 }
 299
 300 void ReservedAddressRange::Unmap(uptr addr, uptr size) {
 301   // Only unmap if it covers the entire range.
 302   CHECK((addr == reinterpret_cast<uptr>(base_)) && (size == size_));
 303   // We unmap the whole range, just null out the base.
 304   base_ = nullptr;
 305   size_ = 0;
 306   UnmapOrDie(reinterpret_cast<void*>(addr), size);
 307 }
 308
 309 void *MmapFixedOrDieOnFatalError(uptr fixed_addr, uptr size, const char *name) {
 310   void *p = VirtualAlloc((LPVOID)fixed_addr, size,
 311       MEM_COMMIT, PAGE_READWRITE);
 312   if (p == 0) {
 313     char mem_type[30];
 314     internal_snprintf(mem_type, sizeof(mem_type), "memory at address 0x%zx",
 315                       fixed_addr);
 316     return ReturnNullptrOnOOMOrDie(size, mem_type, "allocate");
 317   }
 318   return p;
 319 }
 320
 321 void *MmapNoReserveOrDie(uptr size, const char *mem_type) {
 322   // FIXME: make this really NoReserve?
 323   return MmapOrDie(size, mem_type);
 324 }
 325
 326 uptr ReservedAddressRange::Init(uptr size, const char *name, uptr fixed_addr) {
 327   base_ = fixed_addr ? MmapFixedNoAccess(fixed_addr, size) : MmapNoAccess(size);
 328   size_ = size;
 329   name_ = name;
 330   (void)os_handle_;  // unsupported
 331   return reinterpret_cast<uptr>(base_);
 332 }
 333
 334
 335 void *MmapFixedNoAccess(uptr fixed_addr, uptr size, const char *name) {
 336   (void)name; // unsupported
 337   void *res = VirtualAlloc((LPVOID)fixed_addr, size,
 338                            MEM_RESERVE, PAGE_NOACCESS);
 339   if (res == 0)
 340     Report("WARNING: %s failed to "
 341            "mprotect %p (%zd) bytes at %p (error code: %d)\n",
 342            SanitizerToolName, size, size, fixed_addr, GetLastError());
 343   return res;
 344 }
 345
 346 void *MmapNoAccess(uptr size) {
 347   void *res = VirtualAlloc(nullptr, size, MEM_RESERVE, PAGE_NOACCESS);
 348   if (res == 0)
 349     Report("WARNING: %s failed to "
 350            "mprotect %p (%zd) bytes (error code: %d)\n",
 351            SanitizerToolName, size, size, GetLastError());
 352   return res;
 353 }
 354
 355 bool MprotectNoAccess(uptr addr, uptr size) {
 356   DWORD old_protection;
 357   return VirtualProtect((LPVOID)addr, size, PAGE_NOACCESS, &old_protection);
 358 }
 359
 360 bool MprotectReadOnly(uptr addr, uptr size) {
 361   DWORD old_protection;
 362   return VirtualProtect((LPVOID)addr, size, PAGE_READONLY, &old_protection);
 363 }
 364
 365 bool MprotectReadWrite(uptr addr, uptr size) {
 366   DWORD old_protection;
 367   return VirtualProtect((LPVOID)addr, size, PAGE_READWRITE, &old_protection);
 368 }
 369
 370 void ReleaseMemoryPagesToOS(uptr beg, uptr end) {
 371   uptr beg_aligned = RoundDownTo(beg, GetPageSizeCached()),
 372        end_aligned = RoundDownTo(end, GetPageSizeCached());
 373   CHECK(beg < end);                // make sure the region is sane
 374   if (beg_aligned == end_aligned)  // make sure we're freeing at least 1 page;
 375     return;
 376   UnmapOrDie((void *)beg, end_aligned - beg_aligned);
 377 }
 378
 379 void SetShadowRegionHugePageMode(uptr addr, uptr size) {
 380   // FIXME: probably similar to ReleaseMemoryToOS.
 381 }
 382
 383 bool DontDumpShadowMemory(uptr addr, uptr length) {
 384   // This is almost useless on 32-bits.
 385   // FIXME: add madvise-analog when we move to 64-bits.
 386   return true;
 387 }
 388
 389 uptr MapDynamicShadow(uptr shadow_size_bytes, uptr shadow_scale,
 390                       uptr min_shadow_base_alignment,
 391                       UNUSED uptr &high_mem_end) {
 392   const uptr granularity = GetMmapGranularity();
 393   const uptr alignment =
 394       Max<uptr>(granularity << shadow_scale, 1ULL << min_shadow_base_alignment);
 395   const uptr left_padding =
 396       Max<uptr>(granularity, 1ULL << min_shadow_base_alignment);
 397   uptr space_size = shadow_size_bytes + left_padding;
 398   uptr shadow_start = FindAvailableMemoryRange(space_size, alignment,
 399                                                granularity, nullptr, nullptr);
 400   CHECK_NE((uptr)0, shadow_start);
 401   CHECK(IsAligned(shadow_start, alignment));
 402   return shadow_start;
 403 }
 404
 405 uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding,
 406                               uptr *largest_gap_found,
 407                               uptr *max_occupied_addr) {
 408   uptr address = 0;
 409   while (true) {
 410     MEMORY_BASIC_INFORMATION info;
 411     if (!::VirtualQuery((void*)address, &info, sizeof(info)))
 412       return 0;
 413
 414     if (info.State == MEM_FREE) {
 415       uptr shadow_address = RoundUpTo((uptr)info.BaseAddress + left_padding,
 416                                       alignment);
 417       if (shadow_address + size < (uptr)info.BaseAddress + info.RegionSize)
 418         return shadow_address;
 419     }
 420
 421     // Move to the next region.
 422     address = (uptr)info.BaseAddress + info.RegionSize;
 423   }
 424   return 0;
 425 }
 426
 427 uptr MapDynamicShadowAndAliases(uptr shadow_size, uptr alias_size,
 428                                 uptr num_aliases, uptr ring_buffer_size) {
 429   CHECK(false && "HWASan aliasing is unimplemented on Windows");
 430   return 0;
 431 }
 432
 433 bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
 434   MEMORY_BASIC_INFORMATION mbi;
 435   CHECK(VirtualQuery((void *)range_start, &mbi, sizeof(mbi)));
 436   return mbi.Protect == PAGE_NOACCESS &&
 437          (uptr)mbi.BaseAddress + mbi.RegionSize >= range_end;
 438 }
 439
 440 void *MapFileToMemory(const char *file_name, uptr *buff_size) {
 441   UNIMPLEMENTED();
 442 }
 443
 444 void *MapWritableFileToMemory(void *addr, uptr size, fd_t fd, OFF_T offset) {
 445   UNIMPLEMENTED();
 446 }
 447
 448 static const int kMaxEnvNameLength = 128;
 449 static const DWORD kMaxEnvValueLength = 32767;
 450
 451 namespace {
 452
 453 struct EnvVariable {
 454   char name[kMaxEnvNameLength];
 455   char value[kMaxEnvValueLength];
 456 };
 457
 458 }  // namespace
 459
 460 static const int kEnvVariables = 5;
 461 static EnvVariable env_vars[kEnvVariables];
 462 static int num_env_vars;
 463
 464 const char *GetEnv(const char *name) {
 465   // Note: this implementation caches the values of the environment variables
 466   // and limits their quantity.
 467   for (int i = 0; i < num_env_vars; i++) {
 468     if (0 == internal_strcmp(name, env_vars[i].name))
 469       return env_vars[i].value;
 470   }
 471   CHECK_LT(num_env_vars, kEnvVariables);
 472   DWORD rv = GetEnvironmentVariableA(name, env_vars[num_env_vars].value,
 473                                      kMaxEnvValueLength);
 474   if (rv > 0 && rv < kMaxEnvValueLength) {
 475     CHECK_LT(internal_strlen(name), kMaxEnvNameLength);
 476     internal_strncpy(env_vars[num_env_vars].name, name, kMaxEnvNameLength);
 477     num_env_vars++;
 478     return env_vars[num_env_vars - 1].value;
 479   }
 480   return 0;
 481 }
 482
 483 const char *GetPwd() {
 484   UNIMPLEMENTED();
 485 }
 486
 487 u32 GetUid() {
 488   UNIMPLEMENTED();
 489 }
 490
 491 namespace {
 492 struct ModuleInfo {
 493   const char *filepath;
 494   uptr base_address;
 495   uptr end_address;
 496 };
 497
 498 #if !SANITIZER_GO
 499 int CompareModulesBase(const void *pl, const void *pr) {
 500   const ModuleInfo *l = (const ModuleInfo *)pl, *r = (const ModuleInfo *)pr;
 501   if (l->base_address < r->base_address)
 502     return -1;
 503   return l->base_address > r->base_address;
 504 }
 505 #endif
 506 }  // namespace
 507
 508 #if !SANITIZER_GO
 509 void DumpProcessMap() {
 510   Report("Dumping process modules:\n");
 511   ListOfModules modules;
 512   modules.init();
 513   uptr num_modules = modules.size();
 514
 515   InternalMmapVector<ModuleInfo> module_infos(num_modules);
 516   for (size_t i = 0; i < num_modules; ++i) {
 517     module_infos[i].filepath = modules[i].full_name();
 518     module_infos[i].base_address = modules[i].ranges().front()->beg;
 519     module_infos[i].end_address = modules[i].ranges().back()->end;
 520   }
 521   qsort(module_infos.data(), num_modules, sizeof(ModuleInfo),
 522         CompareModulesBase);
 523
 524   for (size_t i = 0; i < num_modules; ++i) {
 525     const ModuleInfo &mi = module_infos[i];
 526     if (mi.end_address != 0) {
 527       Printf("\t%p-%p %s\n", mi.base_address, mi.end_address,
 528              mi.filepath[0] ? mi.filepath : "[no name]");
 529     } else if (mi.filepath[0]) {
 530       Printf("\t??\?-??? %s\n", mi.filepath);
 531     } else {
 532       Printf("\t???\n");
 533     }
 534   }
 535 }
 536 #endif
 537
 538 void DisableCoreDumperIfNecessary() {
 539   // Do nothing.
 540 }
 541
 542 void ReExec() {
 543   UNIMPLEMENTED();
 544 }
 545
 546 void PlatformPrepareForSandboxing(void *args) {}
 547
 548 bool StackSizeIsUnlimited() {
 549   UNIMPLEMENTED();
 550 }
 551
 552 void SetStackSizeLimitInBytes(uptr limit) {
 553   UNIMPLEMENTED();
 554 }
 555
 556 bool AddressSpaceIsUnlimited() {
 557   UNIMPLEMENTED();
 558 }
 559
 560 void SetAddressSpaceUnlimited() {
 561   UNIMPLEMENTED();
 562 }
 563
 564 bool IsPathSeparator(const char c) {
 565   return c == '\\' || c == '/';
 566 }
 567
 568 static bool IsAlpha(char c) {
 569   c = ToLower(c);
 570   return c >= 'a' && c <= 'z';
 571 }
 572
 573 bool IsAbsolutePath(const char *path) {
 574   return path != nullptr && IsAlpha(path[0]) && path[1] == ':' &&
 575          IsPathSeparator(path[2]);
 576 }
 577
 578 void internal_usleep(u64 useconds) { Sleep(useconds / 1000); }
 579
 580 u64 NanoTime() {
 581   static LARGE_INTEGER frequency = {};
 582   LARGE_INTEGER counter;
 583   if (UNLIKELY(frequency.QuadPart == 0)) {
 584     QueryPerformanceFrequency(&frequency);
 585     CHECK_NE(frequency.QuadPart, 0);
 586   }
 587   QueryPerformanceCounter(&counter);
 588   counter.QuadPart *= 1000ULL * 1000000ULL;
 589   counter.QuadPart /= frequency.QuadPart;
 590   return counter.QuadPart;
 591 }
 592
 593 u64 MonotonicNanoTime() { return NanoTime(); }
 594
 595 void Abort() {
 596   internal__exit(3);
 597 }
 598
 599 bool CreateDir(const char *pathname) {
 600   return CreateDirectoryA(pathname, nullptr) != 0;
 601 }
 602
 603 #if !SANITIZER_GO
 604 // Read the file to extract the ImageBase field from the PE header. If ASLR is
 605 // disabled and this virtual address is available, the loader will typically
 606 // load the image at this address. Therefore, we call it the preferred base. Any
 607 // addresses in the DWARF typically assume that the object has been loaded at
 608 // this address.
 609 static uptr GetPreferredBase(const char *modname, char *buf, size_t buf_size) {
 610   fd_t fd = OpenFile(modname, RdOnly, nullptr);
 611   if (fd == kInvalidFd)
 612     return 0;
 613   FileCloser closer(fd);
 614
 615   // Read just the DOS header.
 616   IMAGE_DOS_HEADER dos_header;
 617   uptr bytes_read;
 618   if (!ReadFromFile(fd, &dos_header, sizeof(dos_header), &bytes_read) ||
 619       bytes_read != sizeof(dos_header))
 620     return 0;
 621
 622   // The file should start with the right signature.
 623   if (dos_header.e_magic != IMAGE_DOS_SIGNATURE)
 624     return 0;
 625
 626   // The layout at e_lfanew is:
 627   // "PE\0\0"
 628   // IMAGE_FILE_HEADER
 629   // IMAGE_OPTIONAL_HEADER
 630   // Seek to e_lfanew and read all that data.
 631   if (::SetFilePointer(fd, dos_header.e_lfanew, nullptr, FILE_BEGIN) ==
 632       INVALID_SET_FILE_POINTER)
 633     return 0;
 634   if (!ReadFromFile(fd, buf, buf_size, &bytes_read) || bytes_read != buf_size)
 635     return 0;
 636
 637   // Check for "PE\0\0" before the PE header.
 638   char *pe_sig = &buf[0];
 639   if (internal_memcmp(pe_sig, "PE\0\0", 4) != 0)
 640     return 0;
 641
 642   // Skip over IMAGE_FILE_HEADER. We could do more validation here if we wanted.
 643   IMAGE_OPTIONAL_HEADER *pe_header =
 644       (IMAGE_OPTIONAL_HEADER *)(pe_sig + 4 + sizeof(IMAGE_FILE_HEADER));
 645
 646   // Check for more magic in the PE header.
 647   if (pe_header->Magic != IMAGE_NT_OPTIONAL_HDR_MAGIC)
 648     return 0;
 649
 650   // Finally, return the ImageBase.
 651   return (uptr)pe_header->ImageBase;
 652 }
 653
 654 void ListOfModules::init() {
 655   clearOrInit();
 656   HANDLE cur_process = GetCurrentProcess();
 657
 658   // Query the list of modules.  Start by assuming there are no more than 256
 659   // modules and retry if that's not sufficient.
 660   HMODULE *hmodules = 0;
 661   uptr modules_buffer_size = sizeof(HMODULE) * 256;
 662   DWORD bytes_required;
 663   while (!hmodules) {
 664     hmodules = (HMODULE *)MmapOrDie(modules_buffer_size, __FUNCTION__);
 665     CHECK(EnumProcessModules(cur_process, hmodules, modules_buffer_size,
 666                              &bytes_required));
 667     if (bytes_required > modules_buffer_size) {
 668       // Either there turned out to be more than 256 hmodules, or new hmodules
 669       // could have loaded since the last try.  Retry.
 670       UnmapOrDie(hmodules, modules_buffer_size);
 671       hmodules = 0;
 672       modules_buffer_size = bytes_required;
 673     }
 674   }
 675
 676   InternalMmapVector<char> buf(4 + sizeof(IMAGE_FILE_HEADER) +
 677                                sizeof(IMAGE_OPTIONAL_HEADER));
 678   InternalMmapVector<wchar_t> modname_utf16(kMaxPathLength);
 679   InternalMmapVector<char> module_name(kMaxPathLength);
 680   // |num_modules| is the number of modules actually present,
 681   size_t num_modules = bytes_required / sizeof(HMODULE);
 682   for (size_t i = 0; i < num_modules; ++i) {
 683     HMODULE handle = hmodules[i];
 684     MODULEINFO mi;
 685     if (!GetModuleInformation(cur_process, handle, &mi, sizeof(mi)))
 686       continue;
 687
 688     // Get the UTF-16 path and convert to UTF-8.
 689     int modname_utf16_len =
 690         GetModuleFileNameW(handle, &modname_utf16[0], kMaxPathLength);
 691     if (modname_utf16_len == 0)
 692       modname_utf16[0] = '\0';
 693     int module_name_len = ::WideCharToMultiByte(
 694         CP_UTF8, 0, &modname_utf16[0], modname_utf16_len + 1, &module_name[0],
 695         kMaxPathLength, NULL, NULL);
 696     module_name[module_name_len] = '\0';
 697
 698     uptr base_address = (uptr)mi.lpBaseOfDll;
 699     uptr end_address = (uptr)mi.lpBaseOfDll + mi.SizeOfImage;
 700
 701     // Adjust the base address of the module so that we get a VA instead of an
 702     // RVA when computing the module offset. This helps llvm-symbolizer find the
 703     // right DWARF CU. In the common case that the image is loaded at it's
 704     // preferred address, we will now print normal virtual addresses.
 705     uptr preferred_base =
 706         GetPreferredBase(&module_name[0], &buf[0], buf.size());
 707     uptr adjusted_base = base_address - preferred_base;
 708
 709     modules_.push_back(LoadedModule());
 710     LoadedModule &cur_module = modules_.back();
 711     cur_module.set(&module_name[0], adjusted_base);
 712     // We add the whole module as one single address range.
 713     cur_module.addAddressRange(base_address, end_address, /*executable*/ true,
 714                                /*writable*/ true);
 715   }
 716   UnmapOrDie(hmodules, modules_buffer_size);
 717 }
 718
 719 void ListOfModules::fallbackInit() { clear(); }
 720
 721 // We can't use atexit() directly at __asan_init time as the CRT is not fully
 722 // initialized at this point.  Place the functions into a vector and use
 723 // atexit() as soon as it is ready for use (i.e. after .CRT$XIC initializers).
 724 InternalMmapVectorNoCtor<void (*)(void)> atexit_functions;
 725
 726 static int queueAtexit(void (*function)(void)) {
 727   atexit_functions.push_back(function);
 728   return 0;
 729 }
 730
 731 // If Atexit() is being called after RunAtexit() has already been run, it needs
 732 // to be able to call atexit() directly. Here we use a function ponter to
 733 // switch out its behaviour.
 734 // An example of where this is needed is the asan_dynamic runtime on MinGW-w64.
 735 // On this environment, __asan_init is called during global constructor phase,
 736 // way after calling the .CRT$XID initializer.
 737 static int (*volatile queueOrCallAtExit)(void (*)(void)) = &queueAtexit;
 738
 739 int Atexit(void (*function)(void)) { return queueOrCallAtExit(function); }
 740
 741 static int RunAtexit() {
 742   TraceLoggingUnregister(g_asan_provider);
 743   queueOrCallAtExit = &atexit;
 744   int ret = 0;
 745   for (uptr i = 0; i < atexit_functions.size(); ++i) {
 746     ret |= atexit(atexit_functions[i]);
 747   }
 748   return ret;
 749 }
 750
 751 #pragma section(".CRT$XID", long, read)
 752 __declspec(allocate(".CRT$XID")) int (*__run_atexit)() = RunAtexit;
 753 #endif
 754
 755 // ------------------ sanitizer_libc.h
 756 fd_t OpenFile(const char *filename, FileAccessMode mode, error_t *last_error) {
 757   // FIXME: Use the wide variants to handle Unicode filenames.
 758   fd_t res;
 759   if (mode == RdOnly) {
 760     res = CreateFileA(filename, GENERIC_READ,
 761                       FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
 762                       nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
 763   } else if (mode == WrOnly) {
 764     res = CreateFileA(filename, GENERIC_WRITE, 0, nullptr, CREATE_ALWAYS,
 765                       FILE_ATTRIBUTE_NORMAL, nullptr);
 766   } else {
 767     UNIMPLEMENTED();
 768   }
 769   CHECK(res != kStdoutFd || kStdoutFd == kInvalidFd);
 770   CHECK(res != kStderrFd || kStderrFd == kInvalidFd);
 771   if (res == kInvalidFd && last_error)
 772     *last_error = GetLastError();
 773   return res;
 774 }
 775
 776 void CloseFile(fd_t fd) {
 777   CloseHandle(fd);
 778 }
 779
 780 bool ReadFromFile(fd_t fd, void *buff, uptr buff_size, uptr *bytes_read,
 781                   error_t *error_p) {
 782   CHECK(fd != kInvalidFd);
 783
 784   // bytes_read can't be passed directly to ReadFile:
 785   // uptr is unsigned long long on 64-bit Windows.
 786   unsigned long num_read_long;
 787
 788   bool success = ::ReadFile(fd, buff, buff_size, &num_read_long, nullptr);
 789   if (!success && error_p)
 790     *error_p = GetLastError();
 791   if (bytes_read)
 792     *bytes_read = num_read_long;
 793   return success;
 794 }
 795
 796 bool SupportsColoredOutput(fd_t fd) {
 797   // FIXME: support colored output.
 798   return false;
 799 }
 800
 801 bool WriteToFile(fd_t fd, const void *buff, uptr buff_size, uptr *bytes_written,
 802                  error_t *error_p) {
 803   CHECK(fd != kInvalidFd);
 804
 805   // Handle null optional parameters.
 806   error_t dummy_error;
 807   error_p = error_p ? error_p : &dummy_error;
 808   uptr dummy_bytes_written;
 809   bytes_written = bytes_written ? bytes_written : &dummy_bytes_written;
 810
 811   // Initialize output parameters in case we fail.
 812   *error_p = 0;
 813   *bytes_written = 0;
 814
 815   // Map the conventional Unix fds 1 and 2 to Windows handles. They might be
 816   // closed, in which case this will fail.
 817   if (fd == kStdoutFd || fd == kStderrFd) {
 818     fd = GetStdHandle(fd == kStdoutFd ? STD_OUTPUT_HANDLE : STD_ERROR_HANDLE);
 819     if (fd == 0) {
 820       *error_p = ERROR_INVALID_HANDLE;
 821       return false;
 822     }
 823   }
 824
 825   DWORD bytes_written_32;
 826   if (!WriteFile(fd, buff, buff_size, &bytes_written_32, 0)) {
 827     *error_p = GetLastError();
 828     return false;
 829   } else {
 830     *bytes_written = bytes_written_32;
 831     return true;
 832   }
 833 }
 834
 835 uptr internal_sched_yield() {
 836   Sleep(0);
 837   return 0;
 838 }
 839
 840 void internal__exit(int exitcode) {
 841   TraceLoggingUnregister(g_asan_provider);
 842   // ExitProcess runs some finalizers, so use TerminateProcess to avoid that.
 843   // The debugger doesn't stop on TerminateProcess like it does on ExitProcess,
 844   // so add our own breakpoint here.
 845   if (::IsDebuggerPresent())
 846     __debugbreak();
 847   TerminateProcess(GetCurrentProcess(), exitcode);
 848   BUILTIN_UNREACHABLE();
 849 }
 850
 851 uptr internal_ftruncate(fd_t fd, uptr size) {
 852   UNIMPLEMENTED();
 853 }
 854
 855 uptr GetRSS() {
 856   PROCESS_MEMORY_COUNTERS counters;
 857   if (!GetProcessMemoryInfo(GetCurrentProcess(), &counters, sizeof(counters)))
 858     return 0;
 859   return counters.WorkingSetSize;
 860 }
 861
 862 void *internal_start_thread(void *(*func)(void *arg), void *arg) { return 0; }
 863 void internal_join_thread(void *th) { }
 864
 865 void FutexWait(atomic_uint32_t *p, u32 cmp) {
 866   WaitOnAddress(p, &cmp, sizeof(cmp), INFINITE);
 867 }
 868
 869 void FutexWake(atomic_uint32_t *p, u32 count) {
 870   if (count == 1)
 871     WakeByAddressSingle(p);
 872   else
 873     WakeByAddressAll(p);
 874 }
 875
 876 uptr GetTlsSize() {
 877   return 0;
 878 }
 879
 880 void InitTlsSize() {
 881 }
 882
 883 void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size,
 884                           uptr *tls_addr, uptr *tls_size) {
 885 #if SANITIZER_GO
 886   *stk_addr = 0;
 887   *stk_size = 0;
 888   *tls_addr = 0;
 889   *tls_size = 0;
 890 #else
 891   uptr stack_top, stack_bottom;
 892   GetThreadStackTopAndBottom(main, &stack_top, &stack_bottom);
 893   *stk_addr = stack_bottom;
 894   *stk_size = stack_top - stack_bottom;
 895   *tls_addr = 0;
 896   *tls_size = 0;
 897 #endif
 898 }
 899
 900 void ReportFile::Write(const char *buffer, uptr length) {
 901   SpinMutexLock l(mu);
 902   ReopenIfNecessary();
 903   if (!WriteToFile(fd, buffer, length)) {
 904     // stderr may be closed, but we may be able to print to the debugger
 905     // instead.  This is the case when launching a program from Visual Studio,
 906     // and the following routine should write to its console.
 907     OutputDebugStringA(buffer);
 908   }
 909 }
 910
 911 void SetAlternateSignalStack() {
 912   // FIXME: Decide what to do on Windows.
 913 }
 914
 915 void UnsetAlternateSignalStack() {
 916   // FIXME: Decide what to do on Windows.
 917 }
 918
 919 void InstallDeadlySignalHandlers(SignalHandlerType handler) {
 920   (void)handler;
 921   // FIXME: Decide what to do on Windows.
 922 }
 923
 924 HandleSignalMode GetHandleSignalMode(int signum) {
 925   // FIXME: Decide what to do on Windows.
 926   return kHandleSignalNo;
 927 }
 928
 929 // Check based on flags if we should handle this exception.
 930 bool IsHandledDeadlyException(DWORD exceptionCode) {
 931   switch (exceptionCode) {
 932     case EXCEPTION_ACCESS_VIOLATION:
 933     case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
 934     case EXCEPTION_STACK_OVERFLOW:
 935     case EXCEPTION_DATATYPE_MISALIGNMENT:
 936     case EXCEPTION_IN_PAGE_ERROR:
 937       return common_flags()->handle_segv;
 938     case EXCEPTION_ILLEGAL_INSTRUCTION:
 939     case EXCEPTION_PRIV_INSTRUCTION:
 940     case EXCEPTION_BREAKPOINT:
 941       return common_flags()->handle_sigill;
 942     case EXCEPTION_FLT_DENORMAL_OPERAND:
 943     case EXCEPTION_FLT_DIVIDE_BY_ZERO:
 944     case EXCEPTION_FLT_INEXACT_RESULT:
 945     case EXCEPTION_FLT_INVALID_OPERATION:
 946     case EXCEPTION_FLT_OVERFLOW:
 947     case EXCEPTION_FLT_STACK_CHECK:
 948     case EXCEPTION_FLT_UNDERFLOW:
 949     case EXCEPTION_INT_DIVIDE_BY_ZERO:
 950     case EXCEPTION_INT_OVERFLOW:
 951       return common_flags()->handle_sigfpe;
 952   }
 953   return false;
 954 }
 955
 956 bool IsAccessibleMemoryRange(uptr beg, uptr size) {
 957   SYSTEM_INFO si;
 958   GetNativeSystemInfo(&si);
 959   uptr page_size = si.dwPageSize;
 960   uptr page_mask = ~(page_size - 1);
 961
 962   for (uptr page = beg & page_mask, end = (beg + size - 1) & page_mask;
 963        page <= end;) {
 964     MEMORY_BASIC_INFORMATION info;
 965     if (VirtualQuery((LPCVOID)page, &info, sizeof(info)) != sizeof(info))
 966       return false;
 967
 968     if (info.Protect == 0 || info.Protect == PAGE_NOACCESS ||
 969         info.Protect == PAGE_EXECUTE)
 970       return false;
 971
 972     if (info.RegionSize == 0)
 973       return false;
 974
 975     page += info.RegionSize;
 976   }
 977
 978   return true;
 979 }
 980
 981 bool SignalContext::IsStackOverflow() const {
 982   return (DWORD)GetType() == EXCEPTION_STACK_OVERFLOW;
 983 }
 984
 985 void SignalContext::InitPcSpBp() {
 986   EXCEPTION_RECORD *exception_record = (EXCEPTION_RECORD *)siginfo;
 987   CONTEXT *context_record = (CONTEXT *)context;
 988
 989   pc = (uptr)exception_record->ExceptionAddress;
 990 #  if SANITIZER_WINDOWS64
 991 #    if SANITIZER_ARM64
 992   bp = (uptr)context_record->Fp;
 993   sp = (uptr)context_record->Sp;
 994 #    else
 995   bp = (uptr)context_record->Rbp;
 996   sp = (uptr)context_record->Rsp;
 997 #    endif
 998 #  else
 999   bp = (uptr)context_record->Ebp;
1000   sp = (uptr)context_record->Esp;
1001 #  endif
1002 }
1003
1004 uptr SignalContext::GetAddress() const {
1005   EXCEPTION_RECORD *exception_record = (EXCEPTION_RECORD *)siginfo;
1006   if (exception_record->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
1007     return exception_record->ExceptionInformation[1];
1008   return (uptr)exception_record->ExceptionAddress;
1009 }
1010
1011 bool SignalContext::IsMemoryAccess() const {
1012   return ((EXCEPTION_RECORD *)siginfo)->ExceptionCode ==
1013          EXCEPTION_ACCESS_VIOLATION;
1014 }
1015
1016 bool SignalContext::IsTrueFaultingAddress() const { return true; }
1017
1018 SignalContext::WriteFlag SignalContext::GetWriteFlag() const {
1019   EXCEPTION_RECORD *exception_record = (EXCEPTION_RECORD *)siginfo;
1020
1021   // The write flag is only available for access violation exceptions.
1022   if (exception_record->ExceptionCode != EXCEPTION_ACCESS_VIOLATION)
1023     return SignalContext::Unknown;
1024
1025   // The contents of this array are documented at
1026   // https://docs.microsoft.com/en-us/windows/win32/api/winnt/ns-winnt-exception_record
1027   // The first element indicates read as 0, write as 1, or execute as 8.  The
1028   // second element is the faulting address.
1029   switch (exception_record->ExceptionInformation[0]) {
1030     case 0:
1031       return SignalContext::Read;
1032     case 1:
1033       return SignalContext::Write;
1034     case 8:
1035       return SignalContext::Unknown;
1036   }
1037   return SignalContext::Unknown;
1038 }
1039
1040 void SignalContext::DumpAllRegisters(void *context) {
1041   // FIXME: Implement this.
1042 }
1043
1044 int SignalContext::GetType() const {
1045   return static_cast<const EXCEPTION_RECORD *>(siginfo)->ExceptionCode;
1046 }
1047
1048 const char *SignalContext::Describe() const {
1049   unsigned code = GetType();
1050   // Get the string description of the exception if this is a known deadly
1051   // exception.
1052   switch (code) {
1053     case EXCEPTION_ACCESS_VIOLATION:
1054       return "access-violation";
1055     case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
1056       return "array-bounds-exceeded";
1057     case EXCEPTION_STACK_OVERFLOW:
1058       return "stack-overflow";
1059     case EXCEPTION_DATATYPE_MISALIGNMENT:
1060       return "datatype-misalignment";
1061     case EXCEPTION_IN_PAGE_ERROR:
1062       return "in-page-error";
1063     case EXCEPTION_ILLEGAL_INSTRUCTION:
1064       return "illegal-instruction";
1065     case EXCEPTION_PRIV_INSTRUCTION:
1066       return "priv-instruction";
1067     case EXCEPTION_BREAKPOINT:
1068       return "breakpoint";
1069     case EXCEPTION_FLT_DENORMAL_OPERAND:
1070       return "flt-denormal-operand";
1071     case EXCEPTION_FLT_DIVIDE_BY_ZERO:
1072       return "flt-divide-by-zero";
1073     case EXCEPTION_FLT_INEXACT_RESULT:
1074       return "flt-inexact-result";
1075     case EXCEPTION_FLT_INVALID_OPERATION:
1076       return "flt-invalid-operation";
1077     case EXCEPTION_FLT_OVERFLOW:
1078       return "flt-overflow";
1079     case EXCEPTION_FLT_STACK_CHECK:
1080       return "flt-stack-check";
1081     case EXCEPTION_FLT_UNDERFLOW:
1082       return "flt-underflow";
1083     case EXCEPTION_INT_DIVIDE_BY_ZERO:
1084       return "int-divide-by-zero";
1085     case EXCEPTION_INT_OVERFLOW:
1086       return "int-overflow";
1087   }
1088   return "unknown exception";
1089 }
1090
1091 uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) {
1092   if (buf_len == 0)
1093     return 0;
1094
1095   // Get the UTF-16 path and convert to UTF-8.
1096   InternalMmapVector<wchar_t> binname_utf16(kMaxPathLength);
1097   int binname_utf16_len =
1098       GetModuleFileNameW(NULL, &binname_utf16[0], kMaxPathLength);
1099   if (binname_utf16_len == 0) {
1100     buf[0] = '\0';
1101     return 0;
1102   }
1103   int binary_name_len =
1104       ::WideCharToMultiByte(CP_UTF8, 0, &binname_utf16[0], binname_utf16_len,
1105                             buf, buf_len, NULL, NULL);
1106   if ((unsigned)binary_name_len == buf_len)
1107     --binary_name_len;
1108   buf[binary_name_len] = '\0';
1109   return binary_name_len;
1110 }
1111
1112 uptr ReadLongProcessName(/*out*/char *buf, uptr buf_len) {
1113   return ReadBinaryName(buf, buf_len);
1114 }
1115
1116 void CheckVMASize() {
1117   // Do nothing.
1118 }
1119
1120 void InitializePlatformEarly() {
1121   // Do nothing.
1122 }
1123
1124 void CheckASLR() {
1125   // Do nothing
1126 }
1127
1128 void CheckMPROTECT() {
1129   // Do nothing
1130 }
1131
1132 char **GetArgv() {
1133   // FIXME: Actually implement this function.
1134   return 0;
1135 }
1136
1137 char **GetEnviron() {
1138   // FIXME: Actually implement this function.
1139   return 0;
1140 }
1141
1142 pid_t StartSubprocess(const char *program, const char *const argv[],
1143                       const char *const envp[], fd_t stdin_fd, fd_t stdout_fd,
1144                       fd_t stderr_fd) {
1145   // FIXME: implement on this platform
1146   // Should be implemented based on
1147   // SymbolizerProcess::StarAtSymbolizerSubprocess
1148   // from lib/sanitizer_common/sanitizer_symbolizer_win.cpp.
1149   return -1;
1150 }
1151
1152 bool IsProcessRunning(pid_t pid) {
1153   // FIXME: implement on this platform.
1154   return false;
1155 }
1156
1157 int WaitForProcess(pid_t pid) { return -1; }
1158
1159 // FIXME implement on this platform.
1160 void GetMemoryProfile(fill_profile_f cb, uptr *stats) {}
1161
1162 void CheckNoDeepBind(const char *filename, int flag) {
1163   // Do nothing.
1164 }
1165
1166 // FIXME: implement on this platform.
1167 bool GetRandom(void *buffer, uptr length, bool blocking) {
1168   UNIMPLEMENTED();
1169 }
1170
1171 u32 GetNumberOfCPUs() {
1172   SYSTEM_INFO sysinfo = {};
1173   GetNativeSystemInfo(&sysinfo);
1174   return sysinfo.dwNumberOfProcessors;
1175 }
1176
1177 #if SANITIZER_WIN_TRACE
1178 // TODO(mcgov): Rename this project-wide to PlatformLogInit
1179 void AndroidLogInit(void) {
1180   HRESULT hr = TraceLoggingRegister(g_asan_provider);
1181   if (!SUCCEEDED(hr))
1182     return;
1183 }
1184
1185 void SetAbortMessage(const char *) {}
1186
1187 void LogFullErrorReport(const char *buffer) {
1188   if (common_flags()->log_to_syslog) {
1189     InternalMmapVector<wchar_t> filename;
1190     DWORD filename_length = 0;
1191     do {
1192       filename.resize(filename.size() + 0x100);
1193       filename_length =
1194           GetModuleFileNameW(NULL, filename.begin(), filename.size());
1195     } while (filename_length >= filename.size());
1196     TraceLoggingWrite(g_asan_provider, "AsanReportEvent",
1197                       TraceLoggingValue(filename.begin(), "ExecutableName"),
1198                       TraceLoggingValue(buffer, "AsanReportContents"));
1199   }
1200 }
1201 #endif // SANITIZER_WIN_TRACE
1202
1203 void InitializePlatformCommonFlags(CommonFlags *cf) {}
1204
1205 }  // namespace __sanitizer
1206
1207 #endif  // _WIN32