Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | // This module contains the platform-specific code. This make the rest of the |
| 6 | // code less dependent on operating system, compilers and runtime libraries. |
| 7 | // This module does specifically not deal with differences between different |
| 8 | // processor architecture. |
| 9 | // The platform classes have the same definition for all platforms. The |
| 10 | // implementation for a particular platform is put in platform_<os>.cc. |
| 11 | // The build system then uses the implementation for the target platform. |
| 12 | // |
| 13 | // This design has been chosen because it is simple and fast. Alternatively, |
| 14 | // the platform dependent classes could have been implemented using abstract |
| 15 | // superclasses with virtual methods and having specializations for each |
| 16 | // platform. This design was rejected because it was more complicated and |
| 17 | // slower. It would require factory methods for selecting the right |
| 18 | // implementation and the overhead of virtual methods for performance |
| 19 | // sensitive like mutex locking/unlocking. |
| 20 | |
| 21 | #ifndef V8_BASE_PLATFORM_PLATFORM_H_ |
| 22 | #define V8_BASE_PLATFORM_PLATFORM_H_ |
| 23 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 24 | #include <cstdarg> |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 25 | #include <string> |
| 26 | #include <vector> |
| 27 | |
| 28 | #include "src/base/build_config.h" |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 29 | #include "src/base/compiler-specific.h" |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 30 | #include "src/base/platform/mutex.h" |
| 31 | #include "src/base/platform/semaphore.h" |
| 32 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 33 | #if V8_OS_QNX |
| 34 | #include "src/base/qnx-math.h" |
| 35 | #endif |
| 36 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 37 | namespace v8 { |
| 38 | namespace base { |
| 39 | |
| 40 | // ---------------------------------------------------------------------------- |
| 41 | // Fast TLS support |
| 42 | |
| 43 | #ifndef V8_NO_FAST_TLS |
| 44 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 45 | #if V8_CC_MSVC && V8_HOST_ARCH_IA32 |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 46 | |
| 47 | #define V8_FAST_TLS_SUPPORTED 1 |
| 48 | |
| 49 | INLINE(intptr_t InternalGetExistingThreadLocal(intptr_t index)); |
| 50 | |
| 51 | inline intptr_t InternalGetExistingThreadLocal(intptr_t index) { |
| 52 | const intptr_t kTibInlineTlsOffset = 0xE10; |
| 53 | const intptr_t kTibExtraTlsOffset = 0xF94; |
| 54 | const intptr_t kMaxInlineSlots = 64; |
| 55 | const intptr_t kMaxSlots = kMaxInlineSlots + 1024; |
| 56 | const intptr_t kPointerSize = sizeof(void*); |
| 57 | DCHECK(0 <= index && index < kMaxSlots); |
| 58 | if (index < kMaxInlineSlots) { |
| 59 | return static_cast<intptr_t>(__readfsdword(kTibInlineTlsOffset + |
| 60 | kPointerSize * index)); |
| 61 | } |
| 62 | intptr_t extra = static_cast<intptr_t>(__readfsdword(kTibExtraTlsOffset)); |
| 63 | DCHECK(extra != 0); |
| 64 | return *reinterpret_cast<intptr_t*>(extra + |
| 65 | kPointerSize * (index - kMaxInlineSlots)); |
| 66 | } |
| 67 | |
| 68 | #elif defined(__APPLE__) && (V8_HOST_ARCH_IA32 || V8_HOST_ARCH_X64) |
| 69 | |
| 70 | #define V8_FAST_TLS_SUPPORTED 1 |
| 71 | |
| 72 | extern intptr_t kMacTlsBaseOffset; |
| 73 | |
| 74 | INLINE(intptr_t InternalGetExistingThreadLocal(intptr_t index)); |
| 75 | |
| 76 | inline intptr_t InternalGetExistingThreadLocal(intptr_t index) { |
| 77 | intptr_t result; |
| 78 | #if V8_HOST_ARCH_IA32 |
| 79 | asm("movl %%gs:(%1,%2,4), %0;" |
| 80 | :"=r"(result) // Output must be a writable register. |
| 81 | :"r"(kMacTlsBaseOffset), "r"(index)); |
| 82 | #else |
| 83 | asm("movq %%gs:(%1,%2,8), %0;" |
| 84 | :"=r"(result) |
| 85 | :"r"(kMacTlsBaseOffset), "r"(index)); |
| 86 | #endif |
| 87 | return result; |
| 88 | } |
| 89 | |
| 90 | #endif |
| 91 | |
| 92 | #endif // V8_NO_FAST_TLS |
| 93 | |
| 94 | |
| 95 | class TimezoneCache; |
| 96 | |
| 97 | |
| 98 | // ---------------------------------------------------------------------------- |
| 99 | // OS |
| 100 | // |
| 101 | // This class has static methods for the different platform specific |
| 102 | // functions. Add methods here to cope with differences between the |
| 103 | // supported platforms. |
| 104 | |
| 105 | class OS { |
| 106 | public: |
| 107 | // Initialize the OS class. |
| 108 | // - random_seed: Used for the GetRandomMmapAddress() if non-zero. |
| 109 | // - hard_abort: If true, OS::Abort() will crash instead of aborting. |
| 110 | // - gc_fake_mmap: Name of the file for fake gc mmap used in ll_prof. |
| 111 | static void Initialize(int64_t random_seed, |
| 112 | bool hard_abort, |
| 113 | const char* const gc_fake_mmap); |
| 114 | |
| 115 | // Returns the accumulated user time for thread. This routine |
| 116 | // can be used for profiling. The implementation should |
| 117 | // strive for high-precision timer resolution, preferable |
| 118 | // micro-second resolution. |
| 119 | static int GetUserTime(uint32_t* secs, uint32_t* usecs); |
| 120 | |
| 121 | // Returns current time as the number of milliseconds since |
| 122 | // 00:00:00 UTC, January 1, 1970. |
| 123 | static double TimeCurrentMillis(); |
| 124 | |
| 125 | static TimezoneCache* CreateTimezoneCache(); |
| 126 | static void DisposeTimezoneCache(TimezoneCache* cache); |
| 127 | static void ClearTimezoneCache(TimezoneCache* cache); |
| 128 | |
| 129 | // Returns a string identifying the current time zone. The |
| 130 | // timestamp is used for determining if DST is in effect. |
| 131 | static const char* LocalTimezone(double time, TimezoneCache* cache); |
| 132 | |
| 133 | // Returns the local time offset in milliseconds east of UTC without |
| 134 | // taking daylight savings time into account. |
| 135 | static double LocalTimeOffset(TimezoneCache* cache); |
| 136 | |
| 137 | // Returns the daylight savings offset for the given time. |
| 138 | static double DaylightSavingsOffset(double time, TimezoneCache* cache); |
| 139 | |
| 140 | // Returns last OS error. |
| 141 | static int GetLastError(); |
| 142 | |
| 143 | static FILE* FOpen(const char* path, const char* mode); |
| 144 | static bool Remove(const char* path); |
| 145 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 146 | static char DirectorySeparator(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 147 | static bool isDirectorySeparator(const char ch); |
| 148 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 149 | // Opens a temporary file, the file is auto removed on close. |
| 150 | static FILE* OpenTemporaryFile(); |
| 151 | |
| 152 | // Log file open mode is platform-dependent due to line ends issues. |
| 153 | static const char* const LogFileOpenMode; |
| 154 | |
| 155 | // Print output to console. This is mostly used for debugging output. |
| 156 | // On platforms that has standard terminal output, the output |
| 157 | // should go to stdout. |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 158 | static PRINTF_FORMAT(1, 2) void Print(const char* format, ...); |
| 159 | static PRINTF_FORMAT(1, 0) void VPrint(const char* format, va_list args); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 160 | |
| 161 | // Print output to a file. This is mostly used for debugging output. |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 162 | static PRINTF_FORMAT(2, 3) void FPrint(FILE* out, const char* format, ...); |
| 163 | static PRINTF_FORMAT(2, 0) void VFPrint(FILE* out, const char* format, |
| 164 | va_list args); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 165 | |
| 166 | // Print error output to console. This is mostly used for error message |
| 167 | // output. On platforms that has standard terminal output, the output |
| 168 | // should go to stderr. |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 169 | static PRINTF_FORMAT(1, 2) void PrintError(const char* format, ...); |
| 170 | static PRINTF_FORMAT(1, 0) void VPrintError(const char* format, va_list args); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 171 | |
| 172 | // Allocate/Free memory used by JS heap. Pages are readable/writable, but |
| 173 | // they are not guaranteed to be executable unless 'executable' is true. |
| 174 | // Returns the address of allocated memory, or NULL if failed. |
| 175 | static void* Allocate(const size_t requested, |
| 176 | size_t* allocated, |
| 177 | bool is_executable); |
| 178 | static void Free(void* address, const size_t size); |
| 179 | |
| 180 | // This is the granularity at which the ProtectCode(...) call can set page |
| 181 | // permissions. |
| 182 | static intptr_t CommitPageSize(); |
| 183 | |
| 184 | // Mark code segments non-writable. |
| 185 | static void ProtectCode(void* address, const size_t size); |
| 186 | |
| 187 | // Assign memory as a guard page so that access will cause an exception. |
| 188 | static void Guard(void* address, const size_t size); |
| 189 | |
| 190 | // Generate a random address to be used for hinting mmap(). |
| 191 | static void* GetRandomMmapAddr(); |
| 192 | |
| 193 | // Get the Alignment guaranteed by Allocate(). |
| 194 | static size_t AllocateAlignment(); |
| 195 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 196 | // Sleep for a specified time interval. |
| 197 | static void Sleep(TimeDelta interval); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 198 | |
| 199 | // Abort the current process. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 200 | V8_NORETURN static void Abort(); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 201 | |
| 202 | // Debug break. |
| 203 | static void DebugBreak(); |
| 204 | |
| 205 | // Walk the stack. |
| 206 | static const int kStackWalkError = -1; |
| 207 | static const int kStackWalkMaxNameLen = 256; |
| 208 | static const int kStackWalkMaxTextLen = 256; |
| 209 | struct StackFrame { |
| 210 | void* address; |
| 211 | char text[kStackWalkMaxTextLen]; |
| 212 | }; |
| 213 | |
| 214 | class MemoryMappedFile { |
| 215 | public: |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 216 | virtual ~MemoryMappedFile() {} |
| 217 | virtual void* memory() const = 0; |
| 218 | virtual size_t size() const = 0; |
| 219 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 220 | static MemoryMappedFile* open(const char* name); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 221 | static MemoryMappedFile* create(const char* name, size_t size, |
| 222 | void* initial); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 223 | }; |
| 224 | |
| 225 | // Safe formatting print. Ensures that str is always null-terminated. |
| 226 | // Returns the number of chars written, or -1 if output was truncated. |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 227 | static PRINTF_FORMAT(3, 4) int SNPrintF(char* str, int length, |
| 228 | const char* format, ...); |
| 229 | static PRINTF_FORMAT(3, 0) int VSNPrintF(char* str, int length, |
| 230 | const char* format, va_list args); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 231 | |
| 232 | static char* StrChr(char* str, int c); |
| 233 | static void StrNCpy(char* dest, int length, const char* src, size_t n); |
| 234 | |
| 235 | // Support for the profiler. Can do nothing, in which case ticks |
| 236 | // occuring in shared libraries will not be properly accounted for. |
| 237 | struct SharedLibraryAddress { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 238 | SharedLibraryAddress(const std::string& library_path, uintptr_t start, |
| 239 | uintptr_t end) |
| 240 | : library_path(library_path), start(start), end(end), aslr_slide(0) {} |
| 241 | SharedLibraryAddress(const std::string& library_path, uintptr_t start, |
| 242 | uintptr_t end, intptr_t aslr_slide) |
| 243 | : library_path(library_path), |
| 244 | start(start), |
| 245 | end(end), |
| 246 | aslr_slide(aslr_slide) {} |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 247 | |
| 248 | std::string library_path; |
| 249 | uintptr_t start; |
| 250 | uintptr_t end; |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 251 | intptr_t aslr_slide; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 252 | }; |
| 253 | |
| 254 | static std::vector<SharedLibraryAddress> GetSharedLibraryAddresses(); |
| 255 | |
| 256 | // Support for the profiler. Notifies the external profiling |
| 257 | // process that a code moving garbage collection starts. Can do |
| 258 | // nothing, in which case the code objects must not move (e.g., by |
| 259 | // using --never-compact) if accurate profiling is desired. |
| 260 | static void SignalCodeMovingGC(); |
| 261 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 262 | // Support runtime detection of whether the hard float option of the |
| 263 | // EABI is used. |
| 264 | static bool ArmUsingHardFloat(); |
| 265 | |
| 266 | // Returns the activation frame alignment constraint or zero if |
| 267 | // the platform doesn't care. Guaranteed to be a power of two. |
| 268 | static int ActivationFrameAlignment(); |
| 269 | |
| 270 | static int GetCurrentProcessId(); |
| 271 | |
| 272 | static int GetCurrentThreadId(); |
| 273 | |
| 274 | private: |
| 275 | static const int msPerSecond = 1000; |
| 276 | |
| 277 | #if V8_OS_POSIX |
| 278 | static const char* GetGCFakeMMapFile(); |
| 279 | #endif |
| 280 | |
| 281 | DISALLOW_IMPLICIT_CONSTRUCTORS(OS); |
| 282 | }; |
| 283 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 284 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 285 | // Represents and controls an area of reserved memory. |
| 286 | // Control of the reserved memory can be assigned to another VirtualMemory |
| 287 | // object by assignment or copy-contructing. This removes the reserved memory |
| 288 | // from the original object. |
| 289 | class VirtualMemory { |
| 290 | public: |
| 291 | // Empty VirtualMemory object, controlling no reserved memory. |
| 292 | VirtualMemory(); |
| 293 | |
| 294 | // Reserves virtual memory with size. |
| 295 | explicit VirtualMemory(size_t size); |
| 296 | |
| 297 | // Reserves virtual memory containing an area of the given size that |
| 298 | // is aligned per alignment. This may not be at the position returned |
| 299 | // by address(). |
| 300 | VirtualMemory(size_t size, size_t alignment); |
| 301 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 302 | // Construct a virtual memory by assigning it some already mapped address |
| 303 | // and size. |
| 304 | VirtualMemory(void* address, size_t size) : address_(address), size_(size) {} |
| 305 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 306 | // Releases the reserved memory, if any, controlled by this VirtualMemory |
| 307 | // object. |
| 308 | ~VirtualMemory(); |
| 309 | |
| 310 | // Returns whether the memory has been reserved. |
| 311 | bool IsReserved(); |
| 312 | |
| 313 | // Initialize or resets an embedded VirtualMemory object. |
| 314 | void Reset(); |
| 315 | |
| 316 | // Returns the start address of the reserved memory. |
| 317 | // If the memory was reserved with an alignment, this address is not |
| 318 | // necessarily aligned. The user might need to round it up to a multiple of |
| 319 | // the alignment to get the start of the aligned block. |
| 320 | void* address() { |
| 321 | DCHECK(IsReserved()); |
| 322 | return address_; |
| 323 | } |
| 324 | |
| 325 | // Returns the size of the reserved memory. The returned value is only |
| 326 | // meaningful when IsReserved() returns true. |
| 327 | // If the memory was reserved with an alignment, this size may be larger |
| 328 | // than the requested size. |
| 329 | size_t size() { return size_; } |
| 330 | |
| 331 | // Commits real memory. Returns whether the operation succeeded. |
| 332 | bool Commit(void* address, size_t size, bool is_executable); |
| 333 | |
| 334 | // Uncommit real memory. Returns whether the operation succeeded. |
| 335 | bool Uncommit(void* address, size_t size); |
| 336 | |
| 337 | // Creates a single guard page at the given address. |
| 338 | bool Guard(void* address); |
| 339 | |
| 340 | void Release() { |
| 341 | DCHECK(IsReserved()); |
| 342 | // Notice: Order is important here. The VirtualMemory object might live |
| 343 | // inside the allocated region. |
| 344 | void* address = address_; |
| 345 | size_t size = size_; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 346 | CHECK(InVM(address, size)); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 347 | Reset(); |
| 348 | bool result = ReleaseRegion(address, size); |
| 349 | USE(result); |
| 350 | DCHECK(result); |
| 351 | } |
| 352 | |
| 353 | // Assign control of the reserved region to a different VirtualMemory object. |
| 354 | // The old object is no longer functional (IsReserved() returns false). |
| 355 | void TakeControl(VirtualMemory* from) { |
| 356 | DCHECK(!IsReserved()); |
| 357 | address_ = from->address_; |
| 358 | size_ = from->size_; |
| 359 | from->Reset(); |
| 360 | } |
| 361 | |
| 362 | static void* ReserveRegion(size_t size); |
| 363 | |
| 364 | static bool CommitRegion(void* base, size_t size, bool is_executable); |
| 365 | |
| 366 | static bool UncommitRegion(void* base, size_t size); |
| 367 | |
| 368 | // Must be called with a base pointer that has been returned by ReserveRegion |
| 369 | // and the same size it was reserved with. |
| 370 | static bool ReleaseRegion(void* base, size_t size); |
| 371 | |
| 372 | // Returns true if OS performs lazy commits, i.e. the memory allocation call |
| 373 | // defers actual physical memory allocation till the first memory access. |
| 374 | // Otherwise returns false. |
| 375 | static bool HasLazyCommits(); |
| 376 | |
| 377 | private: |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 378 | bool InVM(void* address, size_t size) { |
| 379 | return (reinterpret_cast<uintptr_t>(address_) <= |
| 380 | reinterpret_cast<uintptr_t>(address)) && |
| 381 | ((reinterpret_cast<uintptr_t>(address_) + size_) >= |
| 382 | (reinterpret_cast<uintptr_t>(address) + size)); |
| 383 | } |
| 384 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 385 | void* address_; // Start address of the virtual memory. |
| 386 | size_t size_; // Size of the virtual memory. |
| 387 | }; |
| 388 | |
| 389 | |
| 390 | // ---------------------------------------------------------------------------- |
| 391 | // Thread |
| 392 | // |
| 393 | // Thread objects are used for creating and running threads. When the start() |
| 394 | // method is called the new thread starts running the run() method in the new |
| 395 | // thread. The Thread object should not be deallocated before the thread has |
| 396 | // terminated. |
| 397 | |
| 398 | class Thread { |
| 399 | public: |
| 400 | // Opaque data type for thread-local storage keys. |
| 401 | typedef int32_t LocalStorageKey; |
| 402 | |
| 403 | class Options { |
| 404 | public: |
| 405 | Options() : name_("v8:<unknown>"), stack_size_(0) {} |
| 406 | explicit Options(const char* name, int stack_size = 0) |
| 407 | : name_(name), stack_size_(stack_size) {} |
| 408 | |
| 409 | const char* name() const { return name_; } |
| 410 | int stack_size() const { return stack_size_; } |
| 411 | |
| 412 | private: |
| 413 | const char* name_; |
| 414 | int stack_size_; |
| 415 | }; |
| 416 | |
| 417 | // Create new thread. |
| 418 | explicit Thread(const Options& options); |
| 419 | virtual ~Thread(); |
| 420 | |
| 421 | // Start new thread by calling the Run() method on the new thread. |
| 422 | void Start(); |
| 423 | |
| 424 | // Start new thread and wait until Run() method is called on the new thread. |
| 425 | void StartSynchronously() { |
| 426 | start_semaphore_ = new Semaphore(0); |
| 427 | Start(); |
| 428 | start_semaphore_->Wait(); |
| 429 | delete start_semaphore_; |
| 430 | start_semaphore_ = NULL; |
| 431 | } |
| 432 | |
| 433 | // Wait until thread terminates. |
| 434 | void Join(); |
| 435 | |
| 436 | inline const char* name() const { |
| 437 | return name_; |
| 438 | } |
| 439 | |
| 440 | // Abstract method for run handler. |
| 441 | virtual void Run() = 0; |
| 442 | |
| 443 | // Thread-local storage. |
| 444 | static LocalStorageKey CreateThreadLocalKey(); |
| 445 | static void DeleteThreadLocalKey(LocalStorageKey key); |
| 446 | static void* GetThreadLocal(LocalStorageKey key); |
| 447 | static int GetThreadLocalInt(LocalStorageKey key) { |
| 448 | return static_cast<int>(reinterpret_cast<intptr_t>(GetThreadLocal(key))); |
| 449 | } |
| 450 | static void SetThreadLocal(LocalStorageKey key, void* value); |
| 451 | static void SetThreadLocalInt(LocalStorageKey key, int value) { |
| 452 | SetThreadLocal(key, reinterpret_cast<void*>(static_cast<intptr_t>(value))); |
| 453 | } |
| 454 | static bool HasThreadLocal(LocalStorageKey key) { |
| 455 | return GetThreadLocal(key) != NULL; |
| 456 | } |
| 457 | |
| 458 | #ifdef V8_FAST_TLS_SUPPORTED |
| 459 | static inline void* GetExistingThreadLocal(LocalStorageKey key) { |
| 460 | void* result = reinterpret_cast<void*>( |
| 461 | InternalGetExistingThreadLocal(static_cast<intptr_t>(key))); |
| 462 | DCHECK(result == GetThreadLocal(key)); |
| 463 | return result; |
| 464 | } |
| 465 | #else |
| 466 | static inline void* GetExistingThreadLocal(LocalStorageKey key) { |
| 467 | return GetThreadLocal(key); |
| 468 | } |
| 469 | #endif |
| 470 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 471 | // The thread name length is limited to 16 based on Linux's implementation of |
| 472 | // prctl(). |
| 473 | static const int kMaxThreadNameLength = 16; |
| 474 | |
| 475 | class PlatformData; |
| 476 | PlatformData* data() { return data_; } |
| 477 | |
| 478 | void NotifyStartedAndRun() { |
| 479 | if (start_semaphore_) start_semaphore_->Signal(); |
| 480 | Run(); |
| 481 | } |
| 482 | |
| 483 | private: |
| 484 | void set_name(const char* name); |
| 485 | |
| 486 | PlatformData* data_; |
| 487 | |
| 488 | char name_[kMaxThreadNameLength]; |
| 489 | int stack_size_; |
| 490 | Semaphore* start_semaphore_; |
| 491 | |
| 492 | DISALLOW_COPY_AND_ASSIGN(Thread); |
| 493 | }; |
| 494 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 495 | } // namespace base |
| 496 | } // namespace v8 |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 497 | |
| 498 | #endif // V8_BASE_PLATFORM_PLATFORM_H_ |