Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | // Platform specific code for Solaris 10 goes here. For the POSIX comaptible |
| 29 | // parts the implementation is in platform-posix.cc. |
| 30 | |
| 31 | #ifdef __sparc |
| 32 | # error "V8 does not support the SPARC CPU architecture." |
| 33 | #endif |
| 34 | |
| 35 | #include <sys/stack.h> // for stack alignment |
| 36 | #include <unistd.h> // getpagesize(), usleep() |
| 37 | #include <sys/mman.h> // mmap() |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 38 | #include <ucontext.h> // walkstack(), getcontext() |
| 39 | #include <dlfcn.h> // dladdr |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 40 | #include <pthread.h> |
| 41 | #include <sched.h> // for sched_yield |
| 42 | #include <semaphore.h> |
| 43 | #include <time.h> |
| 44 | #include <sys/time.h> // gettimeofday(), timeradd() |
| 45 | #include <errno.h> |
| 46 | #include <ieeefp.h> // finite() |
| 47 | #include <signal.h> // sigemptyset(), etc |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 48 | #include <sys/regset.h> |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 49 | |
| 50 | |
| 51 | #undef MAP_TYPE |
| 52 | |
| 53 | #include "v8.h" |
| 54 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 55 | #include "platform-posix.h" |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 56 | #include "platform.h" |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 57 | #include "v8threads.h" |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 58 | #include "vm-state-inl.h" |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 59 | |
| 60 | |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 61 | // It seems there is a bug in some Solaris distributions (experienced in |
| 62 | // SunOS 5.10 Generic_141445-09) which make it difficult or impossible to |
| 63 | // access signbit() despite the availability of other C99 math functions. |
| 64 | #ifndef signbit |
| 65 | // Test sign - usually defined in math.h |
| 66 | int signbit(double x) { |
| 67 | // We need to take care of the special case of both positive and negative |
| 68 | // versions of zero. |
| 69 | if (x == 0) { |
| 70 | return fpclass(x) & FP_NZERO; |
| 71 | } else { |
| 72 | // This won't detect negative NaN but that should be okay since we don't |
| 73 | // assume that behavior. |
| 74 | return x < 0; |
| 75 | } |
| 76 | } |
| 77 | #endif // signbit |
| 78 | |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 79 | namespace v8 { |
| 80 | namespace internal { |
| 81 | |
| 82 | |
| 83 | // 0 is never a valid thread id on Solaris since the main thread is 1 and |
| 84 | // subsequent have their ids incremented from there |
| 85 | static const pthread_t kNoThread = (pthread_t) 0; |
| 86 | |
| 87 | |
| 88 | double ceiling(double x) { |
| 89 | return ceil(x); |
| 90 | } |
| 91 | |
| 92 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 93 | static Mutex* limit_mutex = NULL; |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 94 | void OS::SetUp() { |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 95 | // Seed the random number generator. |
| 96 | // Convert the current time to a 64-bit integer first, before converting it |
| 97 | // to an unsigned. Going directly will cause an overflow and the seed to be |
| 98 | // set to all ones. The seed will be identical for different instances that |
| 99 | // call this setup code within the same millisecond. |
| 100 | uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis()); |
| 101 | srandom(static_cast<unsigned int>(seed)); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 102 | limit_mutex = CreateMutex(); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 103 | } |
| 104 | |
| 105 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 106 | void OS::PostSetUp() { |
| 107 | // Math functions depend on CPU features therefore they are initialized after |
| 108 | // CPU. |
| 109 | MathSetup(); |
| 110 | } |
| 111 | |
| 112 | |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 113 | uint64_t OS::CpuFeaturesImpliedByPlatform() { |
| 114 | return 0; // Solaris runs on a lot of things. |
| 115 | } |
| 116 | |
| 117 | |
| 118 | int OS::ActivationFrameAlignment() { |
Ben Murdoch | 7d3e7fc | 2011-07-12 16:37:06 +0100 | [diff] [blame] | 119 | // GCC generates code that requires 16 byte alignment such as movdqa. |
| 120 | return Max(STACK_ALIGN, 16); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 121 | } |
| 122 | |
| 123 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 124 | void OS::ReleaseStore(volatile AtomicWord* ptr, AtomicWord value) { |
| 125 | __asm__ __volatile__("" : : : "memory"); |
| 126 | *ptr = value; |
| 127 | } |
| 128 | |
| 129 | |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 130 | const char* OS::LocalTimezone(double time) { |
| 131 | if (isnan(time)) return ""; |
| 132 | time_t tv = static_cast<time_t>(floor(time/msPerSecond)); |
| 133 | struct tm* t = localtime(&tv); |
| 134 | if (NULL == t) return ""; |
| 135 | return tzname[0]; // The location of the timezone string on Solaris. |
| 136 | } |
| 137 | |
| 138 | |
| 139 | double OS::LocalTimeOffset() { |
| 140 | // On Solaris, struct tm does not contain a tm_gmtoff field. |
| 141 | time_t utc = time(NULL); |
| 142 | ASSERT(utc != -1); |
| 143 | struct tm* loc = localtime(&utc); |
| 144 | ASSERT(loc != NULL); |
| 145 | return static_cast<double>((mktime(loc) - utc) * msPerSecond); |
| 146 | } |
| 147 | |
| 148 | |
| 149 | // We keep the lowest and highest addresses mapped as a quick way of |
| 150 | // determining that pointers are outside the heap (used mostly in assertions |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 151 | // and verification). The estimate is conservative, i.e., not all addresses in |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 152 | // 'allocated' space are actually allocated to our heap. The range is |
| 153 | // [lowest, highest), inclusive on the low and and exclusive on the high end. |
| 154 | static void* lowest_ever_allocated = reinterpret_cast<void*>(-1); |
| 155 | static void* highest_ever_allocated = reinterpret_cast<void*>(0); |
| 156 | |
| 157 | |
| 158 | static void UpdateAllocatedSpaceLimits(void* address, int size) { |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 159 | ASSERT(limit_mutex != NULL); |
| 160 | ScopedLock lock(limit_mutex); |
| 161 | |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 162 | lowest_ever_allocated = Min(lowest_ever_allocated, address); |
| 163 | highest_ever_allocated = |
| 164 | Max(highest_ever_allocated, |
| 165 | reinterpret_cast<void*>(reinterpret_cast<char*>(address) + size)); |
| 166 | } |
| 167 | |
| 168 | |
| 169 | bool OS::IsOutsideAllocatedSpace(void* address) { |
| 170 | return address < lowest_ever_allocated || address >= highest_ever_allocated; |
| 171 | } |
| 172 | |
| 173 | |
| 174 | size_t OS::AllocateAlignment() { |
| 175 | return static_cast<size_t>(getpagesize()); |
| 176 | } |
| 177 | |
| 178 | |
| 179 | void* OS::Allocate(const size_t requested, |
| 180 | size_t* allocated, |
| 181 | bool is_executable) { |
| 182 | const size_t msize = RoundUp(requested, getpagesize()); |
| 183 | int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); |
| 184 | void* mbase = mmap(NULL, msize, prot, MAP_PRIVATE | MAP_ANON, -1, 0); |
| 185 | |
| 186 | if (mbase == MAP_FAILED) { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 187 | LOG(ISOLATE, StringEvent("OS::Allocate", "mmap failed")); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 188 | return NULL; |
| 189 | } |
| 190 | *allocated = msize; |
| 191 | UpdateAllocatedSpaceLimits(mbase, msize); |
| 192 | return mbase; |
| 193 | } |
| 194 | |
| 195 | |
| 196 | void OS::Free(void* address, const size_t size) { |
| 197 | // TODO(1240712): munmap has a return value which is ignored here. |
| 198 | int result = munmap(address, size); |
| 199 | USE(result); |
| 200 | ASSERT(result == 0); |
| 201 | } |
| 202 | |
| 203 | |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 204 | void OS::Sleep(int milliseconds) { |
| 205 | useconds_t ms = static_cast<useconds_t>(milliseconds); |
| 206 | usleep(1000 * ms); |
| 207 | } |
| 208 | |
| 209 | |
| 210 | void OS::Abort() { |
| 211 | // Redirect to std abort to signal abnormal program termination. |
| 212 | abort(); |
| 213 | } |
| 214 | |
| 215 | |
| 216 | void OS::DebugBreak() { |
| 217 | asm("int $3"); |
| 218 | } |
| 219 | |
| 220 | |
| 221 | class PosixMemoryMappedFile : public OS::MemoryMappedFile { |
| 222 | public: |
| 223 | PosixMemoryMappedFile(FILE* file, void* memory, int size) |
| 224 | : file_(file), memory_(memory), size_(size) { } |
| 225 | virtual ~PosixMemoryMappedFile(); |
| 226 | virtual void* memory() { return memory_; } |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 227 | virtual int size() { return size_; } |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 228 | private: |
| 229 | FILE* file_; |
| 230 | void* memory_; |
| 231 | int size_; |
| 232 | }; |
| 233 | |
| 234 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 235 | OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name) { |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 236 | FILE* file = fopen(name, "r+"); |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 237 | if (file == NULL) return NULL; |
| 238 | |
| 239 | fseek(file, 0, SEEK_END); |
| 240 | int size = ftell(file); |
| 241 | |
| 242 | void* memory = |
| 243 | mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0); |
| 244 | return new PosixMemoryMappedFile(file, memory, size); |
| 245 | } |
| 246 | |
| 247 | |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 248 | OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size, |
| 249 | void* initial) { |
| 250 | FILE* file = fopen(name, "w+"); |
| 251 | if (file == NULL) return NULL; |
| 252 | int result = fwrite(initial, size, 1, file); |
| 253 | if (result < 1) { |
| 254 | fclose(file); |
| 255 | return NULL; |
| 256 | } |
| 257 | void* memory = |
| 258 | mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0); |
| 259 | return new PosixMemoryMappedFile(file, memory, size); |
| 260 | } |
| 261 | |
| 262 | |
| 263 | PosixMemoryMappedFile::~PosixMemoryMappedFile() { |
| 264 | if (memory_) munmap(memory_, size_); |
| 265 | fclose(file_); |
| 266 | } |
| 267 | |
| 268 | |
| 269 | void OS::LogSharedLibraryAddresses() { |
| 270 | } |
| 271 | |
| 272 | |
Ben Murdoch | f87a203 | 2010-10-22 12:50:53 +0100 | [diff] [blame] | 273 | void OS::SignalCodeMovingGC() { |
| 274 | } |
| 275 | |
| 276 | |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 277 | struct StackWalker { |
| 278 | Vector<OS::StackFrame>& frames; |
| 279 | int index; |
| 280 | }; |
| 281 | |
| 282 | |
| 283 | static int StackWalkCallback(uintptr_t pc, int signo, void* data) { |
| 284 | struct StackWalker* walker = static_cast<struct StackWalker*>(data); |
| 285 | Dl_info info; |
| 286 | |
| 287 | int i = walker->index; |
| 288 | |
| 289 | walker->frames[i].address = reinterpret_cast<void*>(pc); |
| 290 | |
| 291 | // Make sure line termination is in place. |
| 292 | walker->frames[i].text[OS::kStackWalkMaxTextLen - 1] = '\0'; |
| 293 | |
| 294 | Vector<char> text = MutableCStrVector(walker->frames[i].text, |
| 295 | OS::kStackWalkMaxTextLen); |
| 296 | |
| 297 | if (dladdr(reinterpret_cast<void*>(pc), &info) == 0) { |
| 298 | OS::SNPrintF(text, "[0x%p]", pc); |
| 299 | } else if ((info.dli_fname != NULL && info.dli_sname != NULL)) { |
| 300 | // We have symbol info. |
| 301 | OS::SNPrintF(text, "%s'%s+0x%x", info.dli_fname, info.dli_sname, pc); |
| 302 | } else { |
| 303 | // No local symbol info. |
| 304 | OS::SNPrintF(text, |
| 305 | "%s'0x%p [0x%p]", |
| 306 | info.dli_fname, |
| 307 | pc - reinterpret_cast<uintptr_t>(info.dli_fbase), |
| 308 | pc); |
| 309 | } |
| 310 | walker->index++; |
| 311 | return 0; |
| 312 | } |
| 313 | |
| 314 | |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 315 | int OS::StackWalk(Vector<OS::StackFrame> frames) { |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 316 | ucontext_t ctx; |
| 317 | struct StackWalker walker = { frames, 0 }; |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 318 | |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 319 | if (getcontext(&ctx) < 0) return kStackWalkError; |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 320 | |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 321 | if (!walkcontext(&ctx, StackWalkCallback, &walker)) { |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 322 | return kStackWalkError; |
| 323 | } |
| 324 | |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 325 | return walker.index; |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 326 | } |
| 327 | |
| 328 | |
| 329 | // Constants used for mmap. |
| 330 | static const int kMmapFd = -1; |
| 331 | static const int kMmapFdOffset = 0; |
| 332 | |
| 333 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 334 | VirtualMemory::VirtualMemory() : address_(NULL), size_(0) { } |
| 335 | |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 336 | VirtualMemory::VirtualMemory(size_t size) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 337 | address_ = ReserveRegion(size); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 338 | size_ = size; |
| 339 | } |
| 340 | |
| 341 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 342 | VirtualMemory::VirtualMemory(size_t size, size_t alignment) |
| 343 | : address_(NULL), size_(0) { |
| 344 | ASSERT(IsAligned(alignment, static_cast<intptr_t>(OS::AllocateAlignment()))); |
| 345 | size_t request_size = RoundUp(size + alignment, |
| 346 | static_cast<intptr_t>(OS::AllocateAlignment())); |
| 347 | void* reservation = mmap(OS::GetRandomMmapAddr(), |
| 348 | request_size, |
| 349 | PROT_NONE, |
| 350 | MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, |
| 351 | kMmapFd, |
| 352 | kMmapFdOffset); |
| 353 | if (reservation == MAP_FAILED) return; |
| 354 | |
| 355 | Address base = static_cast<Address>(reservation); |
| 356 | Address aligned_base = RoundUp(base, alignment); |
| 357 | ASSERT_LE(base, aligned_base); |
| 358 | |
| 359 | // Unmap extra memory reserved before and after the desired block. |
| 360 | if (aligned_base != base) { |
| 361 | size_t prefix_size = static_cast<size_t>(aligned_base - base); |
| 362 | OS::Free(base, prefix_size); |
| 363 | request_size -= prefix_size; |
| 364 | } |
| 365 | |
| 366 | size_t aligned_size = RoundUp(size, OS::AllocateAlignment()); |
| 367 | ASSERT_LE(aligned_size, request_size); |
| 368 | |
| 369 | if (aligned_size != request_size) { |
| 370 | size_t suffix_size = request_size - aligned_size; |
| 371 | OS::Free(aligned_base + aligned_size, suffix_size); |
| 372 | request_size -= suffix_size; |
| 373 | } |
| 374 | |
| 375 | ASSERT(aligned_size == request_size); |
| 376 | |
| 377 | address_ = static_cast<void*>(aligned_base); |
| 378 | size_ = aligned_size; |
| 379 | } |
| 380 | |
| 381 | |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 382 | VirtualMemory::~VirtualMemory() { |
| 383 | if (IsReserved()) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 384 | bool result = ReleaseRegion(address(), size()); |
| 385 | ASSERT(result); |
| 386 | USE(result); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 387 | } |
| 388 | } |
| 389 | |
| 390 | |
| 391 | bool VirtualMemory::IsReserved() { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 392 | return address_ != NULL; |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 393 | } |
| 394 | |
| 395 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 396 | void VirtualMemory::Reset() { |
| 397 | address_ = NULL; |
| 398 | size_ = 0; |
| 399 | } |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 400 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 401 | |
| 402 | bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) { |
| 403 | return CommitRegion(address, size, is_executable); |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 404 | } |
| 405 | |
| 406 | |
| 407 | bool VirtualMemory::Uncommit(void* address, size_t size) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 408 | return UncommitRegion(address, size); |
| 409 | } |
| 410 | |
| 411 | |
| 412 | bool VirtualMemory::Guard(void* address) { |
| 413 | OS::Guard(address, OS::CommitPageSize()); |
| 414 | return true; |
| 415 | } |
| 416 | |
| 417 | |
| 418 | void* VirtualMemory::ReserveRegion(size_t size) { |
| 419 | void* result = mmap(OS::GetRandomMmapAddr(), |
| 420 | size, |
| 421 | PROT_NONE, |
| 422 | MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, |
| 423 | kMmapFd, |
| 424 | kMmapFdOffset); |
| 425 | |
| 426 | if (result == MAP_FAILED) return NULL; |
| 427 | |
| 428 | return result; |
| 429 | } |
| 430 | |
| 431 | |
| 432 | bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) { |
| 433 | int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); |
| 434 | if (MAP_FAILED == mmap(base, |
| 435 | size, |
| 436 | prot, |
| 437 | MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, |
| 438 | kMmapFd, |
| 439 | kMmapFdOffset)) { |
| 440 | return false; |
| 441 | } |
| 442 | |
| 443 | UpdateAllocatedSpaceLimits(base, size); |
| 444 | return true; |
| 445 | } |
| 446 | |
| 447 | |
| 448 | bool VirtualMemory::UncommitRegion(void* base, size_t size) { |
| 449 | return mmap(base, |
| 450 | size, |
| 451 | PROT_NONE, |
| 452 | MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE | MAP_FIXED, |
| 453 | kMmapFd, |
| 454 | kMmapFdOffset) != MAP_FAILED; |
| 455 | } |
| 456 | |
| 457 | |
| 458 | bool VirtualMemory::ReleaseRegion(void* base, size_t size) { |
| 459 | return munmap(base, size) == 0; |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 460 | } |
| 461 | |
| 462 | |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 463 | class Thread::PlatformData : public Malloced { |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 464 | public: |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 465 | PlatformData() : thread_(kNoThread) { } |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 466 | |
| 467 | pthread_t thread_; // Thread handle for pthread. |
| 468 | }; |
| 469 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 470 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 471 | Thread::Thread(const Options& options) |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 472 | : data_(new PlatformData()), |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 473 | stack_size_(options.stack_size()) { |
| 474 | set_name(options.name()); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 475 | } |
| 476 | |
| 477 | |
| 478 | Thread::~Thread() { |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 479 | delete data_; |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 480 | } |
| 481 | |
| 482 | |
| 483 | static void* ThreadEntry(void* arg) { |
| 484 | Thread* thread = reinterpret_cast<Thread*>(arg); |
| 485 | // This is also initialized by the first argument to pthread_create() but we |
| 486 | // don't know which thread will run first (the original thread or the new |
| 487 | // one) so we initialize it here too. |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 488 | thread->data()->thread_ = pthread_self(); |
| 489 | ASSERT(thread->data()->thread_ != kNoThread); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 490 | thread->Run(); |
| 491 | return NULL; |
| 492 | } |
| 493 | |
| 494 | |
Steve Block | 9fac840 | 2011-05-12 15:51:54 +0100 | [diff] [blame] | 495 | void Thread::set_name(const char* name) { |
| 496 | strncpy(name_, name, sizeof(name_)); |
| 497 | name_[sizeof(name_) - 1] = '\0'; |
| 498 | } |
| 499 | |
| 500 | |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 501 | void Thread::Start() { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 502 | pthread_attr_t* attr_ptr = NULL; |
| 503 | pthread_attr_t attr; |
| 504 | if (stack_size_ > 0) { |
| 505 | pthread_attr_init(&attr); |
| 506 | pthread_attr_setstacksize(&attr, static_cast<size_t>(stack_size_)); |
| 507 | attr_ptr = &attr; |
| 508 | } |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 509 | pthread_create(&data_->thread_, NULL, ThreadEntry, this); |
| 510 | ASSERT(data_->thread_ != kNoThread); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 511 | } |
| 512 | |
| 513 | |
| 514 | void Thread::Join() { |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 515 | pthread_join(data_->thread_, NULL); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 516 | } |
| 517 | |
| 518 | |
| 519 | Thread::LocalStorageKey Thread::CreateThreadLocalKey() { |
| 520 | pthread_key_t key; |
| 521 | int result = pthread_key_create(&key, NULL); |
| 522 | USE(result); |
| 523 | ASSERT(result == 0); |
| 524 | return static_cast<LocalStorageKey>(key); |
| 525 | } |
| 526 | |
| 527 | |
| 528 | void Thread::DeleteThreadLocalKey(LocalStorageKey key) { |
| 529 | pthread_key_t pthread_key = static_cast<pthread_key_t>(key); |
| 530 | int result = pthread_key_delete(pthread_key); |
| 531 | USE(result); |
| 532 | ASSERT(result == 0); |
| 533 | } |
| 534 | |
| 535 | |
| 536 | void* Thread::GetThreadLocal(LocalStorageKey key) { |
| 537 | pthread_key_t pthread_key = static_cast<pthread_key_t>(key); |
| 538 | return pthread_getspecific(pthread_key); |
| 539 | } |
| 540 | |
| 541 | |
| 542 | void Thread::SetThreadLocal(LocalStorageKey key, void* value) { |
| 543 | pthread_key_t pthread_key = static_cast<pthread_key_t>(key); |
| 544 | pthread_setspecific(pthread_key, value); |
| 545 | } |
| 546 | |
| 547 | |
| 548 | void Thread::YieldCPU() { |
| 549 | sched_yield(); |
| 550 | } |
| 551 | |
| 552 | |
| 553 | class SolarisMutex : public Mutex { |
| 554 | public: |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 555 | SolarisMutex() { |
| 556 | pthread_mutexattr_t attr; |
| 557 | pthread_mutexattr_init(&attr); |
| 558 | pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); |
| 559 | pthread_mutex_init(&mutex_, &attr); |
| 560 | } |
| 561 | |
| 562 | ~SolarisMutex() { pthread_mutex_destroy(&mutex_); } |
| 563 | |
| 564 | int Lock() { return pthread_mutex_lock(&mutex_); } |
| 565 | |
| 566 | int Unlock() { return pthread_mutex_unlock(&mutex_); } |
| 567 | |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 568 | virtual bool TryLock() { |
| 569 | int result = pthread_mutex_trylock(&mutex_); |
| 570 | // Return false if the lock is busy and locking failed. |
| 571 | if (result == EBUSY) { |
| 572 | return false; |
| 573 | } |
| 574 | ASSERT(result == 0); // Verify no other errors. |
| 575 | return true; |
| 576 | } |
| 577 | |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 578 | private: |
| 579 | pthread_mutex_t mutex_; |
| 580 | }; |
| 581 | |
| 582 | |
| 583 | Mutex* OS::CreateMutex() { |
| 584 | return new SolarisMutex(); |
| 585 | } |
| 586 | |
| 587 | |
| 588 | class SolarisSemaphore : public Semaphore { |
| 589 | public: |
| 590 | explicit SolarisSemaphore(int count) { sem_init(&sem_, 0, count); } |
| 591 | virtual ~SolarisSemaphore() { sem_destroy(&sem_); } |
| 592 | |
| 593 | virtual void Wait(); |
| 594 | virtual bool Wait(int timeout); |
| 595 | virtual void Signal() { sem_post(&sem_); } |
| 596 | private: |
| 597 | sem_t sem_; |
| 598 | }; |
| 599 | |
| 600 | |
| 601 | void SolarisSemaphore::Wait() { |
| 602 | while (true) { |
| 603 | int result = sem_wait(&sem_); |
| 604 | if (result == 0) return; // Successfully got semaphore. |
| 605 | CHECK(result == -1 && errno == EINTR); // Signal caused spurious wakeup. |
| 606 | } |
| 607 | } |
| 608 | |
| 609 | |
| 610 | #ifndef TIMEVAL_TO_TIMESPEC |
| 611 | #define TIMEVAL_TO_TIMESPEC(tv, ts) do { \ |
| 612 | (ts)->tv_sec = (tv)->tv_sec; \ |
| 613 | (ts)->tv_nsec = (tv)->tv_usec * 1000; \ |
| 614 | } while (false) |
| 615 | #endif |
| 616 | |
| 617 | |
| 618 | #ifndef timeradd |
| 619 | #define timeradd(a, b, result) \ |
| 620 | do { \ |
| 621 | (result)->tv_sec = (a)->tv_sec + (b)->tv_sec; \ |
| 622 | (result)->tv_usec = (a)->tv_usec + (b)->tv_usec; \ |
| 623 | if ((result)->tv_usec >= 1000000) { \ |
| 624 | ++(result)->tv_sec; \ |
| 625 | (result)->tv_usec -= 1000000; \ |
| 626 | } \ |
| 627 | } while (0) |
| 628 | #endif |
| 629 | |
| 630 | |
| 631 | bool SolarisSemaphore::Wait(int timeout) { |
| 632 | const long kOneSecondMicros = 1000000; // NOLINT |
| 633 | |
| 634 | // Split timeout into second and nanosecond parts. |
| 635 | struct timeval delta; |
| 636 | delta.tv_usec = timeout % kOneSecondMicros; |
| 637 | delta.tv_sec = timeout / kOneSecondMicros; |
| 638 | |
| 639 | struct timeval current_time; |
| 640 | // Get the current time. |
| 641 | if (gettimeofday(¤t_time, NULL) == -1) { |
| 642 | return false; |
| 643 | } |
| 644 | |
| 645 | // Calculate time for end of timeout. |
| 646 | struct timeval end_time; |
| 647 | timeradd(¤t_time, &delta, &end_time); |
| 648 | |
| 649 | struct timespec ts; |
| 650 | TIMEVAL_TO_TIMESPEC(&end_time, &ts); |
| 651 | // Wait for semaphore signalled or timeout. |
| 652 | while (true) { |
| 653 | int result = sem_timedwait(&sem_, &ts); |
| 654 | if (result == 0) return true; // Successfully got semaphore. |
| 655 | if (result == -1 && errno == ETIMEDOUT) return false; // Timeout. |
| 656 | CHECK(result == -1 && errno == EINTR); // Signal caused spurious wakeup. |
| 657 | } |
| 658 | } |
| 659 | |
| 660 | |
| 661 | Semaphore* OS::CreateSemaphore(int count) { |
| 662 | return new SolarisSemaphore(count); |
| 663 | } |
| 664 | |
| 665 | |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 666 | static pthread_t GetThreadID() { |
| 667 | return pthread_self(); |
| 668 | } |
| 669 | |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 670 | static void ProfilerSignalHandler(int signal, siginfo_t* info, void* context) { |
| 671 | USE(info); |
| 672 | if (signal != SIGPROF) return; |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 673 | Isolate* isolate = Isolate::UncheckedCurrent(); |
| 674 | if (isolate == NULL || !isolate->IsInitialized() || !isolate->IsInUse()) { |
| 675 | // We require a fully initialized and entered isolate. |
| 676 | return; |
| 677 | } |
| 678 | if (v8::Locker::IsActive() && |
| 679 | !isolate->thread_manager()->IsLockedByCurrentThread()) { |
| 680 | return; |
| 681 | } |
| 682 | |
| 683 | Sampler* sampler = isolate->logger()->sampler(); |
| 684 | if (sampler == NULL || !sampler->IsActive()) return; |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 685 | |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 686 | TickSample sample_obj; |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 687 | TickSample* sample = CpuProfiler::TickSampleEvent(isolate); |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 688 | if (sample == NULL) sample = &sample_obj; |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 689 | |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 690 | // Extracting the sample from the context is extremely machine dependent. |
| 691 | ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(context); |
| 692 | mcontext_t& mcontext = ucontext->uc_mcontext; |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 693 | sample->state = isolate->current_vm_state(); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 694 | |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 695 | sample->pc = reinterpret_cast<Address>(mcontext.gregs[REG_PC]); |
| 696 | sample->sp = reinterpret_cast<Address>(mcontext.gregs[REG_SP]); |
| 697 | sample->fp = reinterpret_cast<Address>(mcontext.gregs[REG_FP]); |
| 698 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 699 | sampler->SampleStack(sample); |
| 700 | sampler->Tick(sample); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 701 | } |
| 702 | |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 703 | class Sampler::PlatformData : public Malloced { |
| 704 | public: |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 705 | PlatformData() : vm_tid_(GetThreadID()) {} |
| 706 | |
| 707 | pthread_t vm_tid() const { return vm_tid_; } |
| 708 | |
| 709 | private: |
| 710 | pthread_t vm_tid_; |
| 711 | }; |
| 712 | |
| 713 | |
| 714 | class SignalSender : public Thread { |
| 715 | public: |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 716 | enum SleepInterval { |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 717 | HALF_INTERVAL, |
| 718 | FULL_INTERVAL |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 719 | }; |
| 720 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 721 | static const int kSignalSenderStackSize = 64 * KB; |
| 722 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 723 | explicit SignalSender(int interval) |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 724 | : Thread(Thread::Options("SignalSender", kSignalSenderStackSize)), |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 725 | interval_(interval) {} |
| 726 | |
| 727 | static void InstallSignalHandler() { |
| 728 | struct sigaction sa; |
| 729 | sa.sa_sigaction = ProfilerSignalHandler; |
| 730 | sigemptyset(&sa.sa_mask); |
| 731 | sa.sa_flags = SA_RESTART | SA_SIGINFO; |
| 732 | signal_handler_installed_ = |
| 733 | (sigaction(SIGPROF, &sa, &old_signal_handler_) == 0); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 734 | } |
| 735 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 736 | static void RestoreSignalHandler() { |
| 737 | if (signal_handler_installed_) { |
| 738 | sigaction(SIGPROF, &old_signal_handler_, 0); |
| 739 | signal_handler_installed_ = false; |
| 740 | } |
| 741 | } |
| 742 | |
| 743 | static void AddActiveSampler(Sampler* sampler) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 744 | ScopedLock lock(mutex_.Pointer()); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 745 | SamplerRegistry::AddActiveSampler(sampler); |
| 746 | if (instance_ == NULL) { |
| 747 | // Start a thread that will send SIGPROF signal to VM threads, |
| 748 | // when CPU profiling will be enabled. |
| 749 | instance_ = new SignalSender(sampler->interval()); |
| 750 | instance_->Start(); |
| 751 | } else { |
| 752 | ASSERT(instance_->interval_ == sampler->interval()); |
| 753 | } |
| 754 | } |
| 755 | |
| 756 | static void RemoveActiveSampler(Sampler* sampler) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 757 | ScopedLock lock(mutex_.Pointer()); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 758 | SamplerRegistry::RemoveActiveSampler(sampler); |
| 759 | if (SamplerRegistry::GetState() == SamplerRegistry::HAS_NO_SAMPLERS) { |
| 760 | RuntimeProfiler::StopRuntimeProfilerThreadBeforeShutdown(instance_); |
| 761 | delete instance_; |
| 762 | instance_ = NULL; |
| 763 | RestoreSignalHandler(); |
| 764 | } |
| 765 | } |
| 766 | |
| 767 | // Implement Thread::Run(). |
| 768 | virtual void Run() { |
| 769 | SamplerRegistry::State state; |
| 770 | while ((state = SamplerRegistry::GetState()) != |
| 771 | SamplerRegistry::HAS_NO_SAMPLERS) { |
| 772 | bool cpu_profiling_enabled = |
| 773 | (state == SamplerRegistry::HAS_CPU_PROFILING_SAMPLERS); |
| 774 | bool runtime_profiler_enabled = RuntimeProfiler::IsEnabled(); |
| 775 | if (cpu_profiling_enabled && !signal_handler_installed_) { |
| 776 | InstallSignalHandler(); |
| 777 | } else if (!cpu_profiling_enabled && signal_handler_installed_) { |
| 778 | RestoreSignalHandler(); |
| 779 | } |
| 780 | |
| 781 | // When CPU profiling is enabled both JavaScript and C++ code is |
| 782 | // profiled. We must not suspend. |
| 783 | if (!cpu_profiling_enabled) { |
| 784 | if (rate_limiter_.SuspendIfNecessary()) continue; |
| 785 | } |
| 786 | if (cpu_profiling_enabled && runtime_profiler_enabled) { |
| 787 | if (!SamplerRegistry::IterateActiveSamplers(&DoCpuProfile, this)) { |
| 788 | return; |
| 789 | } |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 790 | Sleep(HALF_INTERVAL); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 791 | if (!SamplerRegistry::IterateActiveSamplers(&DoRuntimeProfile, NULL)) { |
| 792 | return; |
| 793 | } |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 794 | Sleep(HALF_INTERVAL); |
| 795 | } else { |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 796 | if (cpu_profiling_enabled) { |
| 797 | if (!SamplerRegistry::IterateActiveSamplers(&DoCpuProfile, |
| 798 | this)) { |
| 799 | return; |
| 800 | } |
| 801 | } |
| 802 | if (runtime_profiler_enabled) { |
| 803 | if (!SamplerRegistry::IterateActiveSamplers(&DoRuntimeProfile, |
| 804 | NULL)) { |
| 805 | return; |
| 806 | } |
| 807 | } |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 808 | Sleep(FULL_INTERVAL); |
| 809 | } |
| 810 | } |
| 811 | } |
| 812 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 813 | static void DoCpuProfile(Sampler* sampler, void* raw_sender) { |
| 814 | if (!sampler->IsProfiling()) return; |
| 815 | SignalSender* sender = reinterpret_cast<SignalSender*>(raw_sender); |
| 816 | sender->SendProfilingSignal(sampler->platform_data()->vm_tid()); |
| 817 | } |
| 818 | |
| 819 | static void DoRuntimeProfile(Sampler* sampler, void* ignored) { |
| 820 | if (!sampler->isolate()->IsInitialized()) return; |
| 821 | sampler->isolate()->runtime_profiler()->NotifyTick(); |
| 822 | } |
| 823 | |
| 824 | void SendProfilingSignal(pthread_t tid) { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 825 | if (!signal_handler_installed_) return; |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 826 | pthread_kill(tid, SIGPROF); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 827 | } |
| 828 | |
| 829 | void Sleep(SleepInterval full_or_half) { |
| 830 | // Convert ms to us and subtract 100 us to compensate delays |
| 831 | // occuring during signal delivery. |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 832 | useconds_t interval = interval_ * 1000 - 100; |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 833 | if (full_or_half == HALF_INTERVAL) interval /= 2; |
| 834 | int result = usleep(interval); |
| 835 | #ifdef DEBUG |
| 836 | if (result != 0 && errno != EINTR) { |
| 837 | fprintf(stderr, |
| 838 | "SignalSender usleep error; interval = %u, errno = %d\n", |
| 839 | interval, |
| 840 | errno); |
| 841 | ASSERT(result == 0 || errno == EINTR); |
| 842 | } |
| 843 | #endif |
| 844 | USE(result); |
| 845 | } |
| 846 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 847 | const int interval_; |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 848 | RuntimeProfilerRateLimiter rate_limiter_; |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 849 | |
| 850 | // Protects the process wide state below. |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 851 | static LazyMutex mutex_; |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 852 | static SignalSender* instance_; |
| 853 | static bool signal_handler_installed_; |
| 854 | static struct sigaction old_signal_handler_; |
| 855 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 856 | private: |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 857 | DISALLOW_COPY_AND_ASSIGN(SignalSender); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 858 | }; |
| 859 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 860 | LazyMutex SignalSender::mutex_ = LAZY_MUTEX_INITIALIZER; |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 861 | SignalSender* SignalSender::instance_ = NULL; |
| 862 | struct sigaction SignalSender::old_signal_handler_; |
| 863 | bool SignalSender::signal_handler_installed_ = false; |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 864 | |
| 865 | |
| 866 | Sampler::Sampler(Isolate* isolate, int interval) |
| 867 | : isolate_(isolate), |
| 868 | interval_(interval), |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 869 | profiling_(false), |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 870 | active_(false), |
| 871 | samples_taken_(0) { |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 872 | data_ = new PlatformData; |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 873 | } |
| 874 | |
| 875 | |
| 876 | Sampler::~Sampler() { |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 877 | ASSERT(!IsActive()); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 878 | delete data_; |
| 879 | } |
| 880 | |
| 881 | |
| 882 | void Sampler::Start() { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 883 | ASSERT(!IsActive()); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 884 | SetActive(true); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 885 | SignalSender::AddActiveSampler(this); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 886 | } |
| 887 | |
| 888 | |
| 889 | void Sampler::Stop() { |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 890 | ASSERT(IsActive()); |
| 891 | SignalSender::RemoveActiveSampler(this); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 892 | SetActive(false); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 893 | } |
| 894 | |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 895 | } } // namespace v8::internal |