jkummerow@chromium.org | 05ed9dd | 2012-01-23 14:42:48 +0000 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +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 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 28 | // Platform specific code for FreeBSD goes here. For the POSIX comaptible parts |
| 29 | // the implementation is in platform-posix.cc. |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 30 | |
| 31 | #include <pthread.h> |
| 32 | #include <semaphore.h> |
| 33 | #include <signal.h> |
| 34 | #include <sys/time.h> |
| 35 | #include <sys/resource.h> |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 36 | #include <sys/types.h> |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 37 | #include <sys/ucontext.h> |
| 38 | #include <stdlib.h> |
| 39 | |
| 40 | #include <sys/types.h> // mmap & munmap |
| 41 | #include <sys/mman.h> // mmap & munmap |
| 42 | #include <sys/stat.h> // open |
| 43 | #include <sys/fcntl.h> // open |
| 44 | #include <unistd.h> // getpagesize |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 45 | // If you don't have execinfo.h then you need devel/libexecinfo from ports. |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 46 | #include <execinfo.h> // backtrace, backtrace_symbols |
| 47 | #include <strings.h> // index |
| 48 | #include <errno.h> |
| 49 | #include <stdarg.h> |
| 50 | #include <limits.h> |
| 51 | |
| 52 | #undef MAP_TYPE |
| 53 | |
| 54 | #include "v8.h" |
lrn@chromium.org | 1c09276 | 2011-05-09 09:42:16 +0000 | [diff] [blame] | 55 | #include "v8threads.h" |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 56 | |
danno@chromium.org | 8c0a43f | 2012-04-03 08:37:53 +0000 | [diff] [blame] | 57 | #include "platform-posix.h" |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 58 | #include "platform.h" |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 59 | #include "vm-state-inl.h" |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 60 | |
| 61 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 62 | namespace v8 { |
| 63 | namespace internal { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 64 | |
| 65 | // 0 is never a valid thread id on FreeBSD since tids and pids share a |
| 66 | // name space and pid 0 is used to kill the group (see man 2 kill). |
| 67 | static const pthread_t kNoThread = (pthread_t) 0; |
| 68 | |
| 69 | |
| 70 | double ceiling(double x) { |
| 71 | // Correct as on OS X |
| 72 | if (-1.0 < x && x < 0.0) { |
| 73 | return -0.0; |
| 74 | } else { |
| 75 | return ceil(x); |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 80 | static Mutex* limit_mutex = NULL; |
| 81 | |
| 82 | |
danno@chromium.org | 8c0a43f | 2012-04-03 08:37:53 +0000 | [diff] [blame] | 83 | void OS::PostSetUp() { |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 84 | POSIXPostSetUp(); |
danno@chromium.org | 8c0a43f | 2012-04-03 08:37:53 +0000 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 88 | void OS::ReleaseStore(volatile AtomicWord* ptr, AtomicWord value) { |
| 89 | __asm__ __volatile__("" : : : "memory"); |
| 90 | *ptr = value; |
| 91 | } |
| 92 | |
| 93 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 94 | uint64_t OS::CpuFeaturesImpliedByPlatform() { |
| 95 | return 0; // FreeBSD runs on anything. |
| 96 | } |
| 97 | |
| 98 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 99 | int OS::ActivationFrameAlignment() { |
| 100 | // 16 byte alignment on FreeBSD |
| 101 | return 16; |
| 102 | } |
| 103 | |
| 104 | |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 105 | const char* OS::LocalTimezone(double time) { |
| 106 | if (isnan(time)) return ""; |
| 107 | time_t tv = static_cast<time_t>(floor(time/msPerSecond)); |
| 108 | struct tm* t = localtime(&tv); |
| 109 | if (NULL == t) return ""; |
| 110 | return t->tm_zone; |
| 111 | } |
| 112 | |
| 113 | |
| 114 | double OS::LocalTimeOffset() { |
| 115 | time_t tv = time(NULL); |
| 116 | struct tm* t = localtime(&tv); |
| 117 | // tm_gmtoff includes any daylight savings offset, so subtract it. |
| 118 | return static_cast<double>(t->tm_gmtoff * msPerSecond - |
| 119 | (t->tm_isdst > 0 ? 3600 * msPerSecond : 0)); |
| 120 | } |
| 121 | |
| 122 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 123 | // We keep the lowest and highest addresses mapped as a quick way of |
| 124 | // determining that pointers are outside the heap (used mostly in assertions |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 125 | // and verification). The estimate is conservative, i.e., not all addresses in |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 126 | // 'allocated' space are actually allocated to our heap. The range is |
| 127 | // [lowest, highest), inclusive on the low and and exclusive on the high end. |
| 128 | static void* lowest_ever_allocated = reinterpret_cast<void*>(-1); |
| 129 | static void* highest_ever_allocated = reinterpret_cast<void*>(0); |
| 130 | |
| 131 | |
| 132 | static void UpdateAllocatedSpaceLimits(void* address, int size) { |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 133 | ASSERT(limit_mutex != NULL); |
| 134 | ScopedLock lock(limit_mutex); |
| 135 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 136 | lowest_ever_allocated = Min(lowest_ever_allocated, address); |
| 137 | highest_ever_allocated = |
| 138 | Max(highest_ever_allocated, |
| 139 | reinterpret_cast<void*>(reinterpret_cast<char*>(address) + size)); |
| 140 | } |
| 141 | |
| 142 | |
| 143 | bool OS::IsOutsideAllocatedSpace(void* address) { |
| 144 | return address < lowest_ever_allocated || address >= highest_ever_allocated; |
| 145 | } |
| 146 | |
| 147 | |
| 148 | size_t OS::AllocateAlignment() { |
| 149 | return getpagesize(); |
| 150 | } |
| 151 | |
| 152 | |
| 153 | void* OS::Allocate(const size_t requested, |
| 154 | size_t* allocated, |
| 155 | bool executable) { |
| 156 | const size_t msize = RoundUp(requested, getpagesize()); |
| 157 | int prot = PROT_READ | PROT_WRITE | (executable ? PROT_EXEC : 0); |
| 158 | void* mbase = mmap(NULL, msize, prot, MAP_PRIVATE | MAP_ANON, -1, 0); |
| 159 | |
| 160 | if (mbase == MAP_FAILED) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 161 | LOG(ISOLATE, StringEvent("OS::Allocate", "mmap failed")); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 162 | return NULL; |
| 163 | } |
| 164 | *allocated = msize; |
| 165 | UpdateAllocatedSpaceLimits(mbase, msize); |
| 166 | return mbase; |
| 167 | } |
| 168 | |
| 169 | |
| 170 | void OS::Free(void* buf, const size_t length) { |
| 171 | // TODO(1240712): munmap has a return value which is ignored here. |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 172 | int result = munmap(buf, length); |
| 173 | USE(result); |
| 174 | ASSERT(result == 0); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 175 | } |
| 176 | |
| 177 | |
| 178 | void OS::Sleep(int milliseconds) { |
| 179 | unsigned int ms = static_cast<unsigned int>(milliseconds); |
| 180 | usleep(1000 * ms); |
| 181 | } |
| 182 | |
| 183 | |
| 184 | void OS::Abort() { |
| 185 | // Redirect to std abort to signal abnormal program termination. |
| 186 | abort(); |
| 187 | } |
| 188 | |
| 189 | |
| 190 | void OS::DebugBreak() { |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 191 | #if (defined(__arm__) || defined(__thumb__)) |
| 192 | # if defined(CAN_USE_ARMV5_INSTRUCTIONS) |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 193 | asm("bkpt 0"); |
ricow@chromium.org | 0b9f850 | 2010-08-18 07:45:01 +0000 | [diff] [blame] | 194 | # endif |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 195 | #else |
| 196 | asm("int $3"); |
| 197 | #endif |
| 198 | } |
| 199 | |
| 200 | |
| 201 | class PosixMemoryMappedFile : public OS::MemoryMappedFile { |
| 202 | public: |
| 203 | PosixMemoryMappedFile(FILE* file, void* memory, int size) |
| 204 | : file_(file), memory_(memory), size_(size) { } |
| 205 | virtual ~PosixMemoryMappedFile(); |
| 206 | virtual void* memory() { return memory_; } |
vegorov@chromium.org | 0a4e901 | 2011-01-24 12:33:13 +0000 | [diff] [blame] | 207 | virtual int size() { return size_; } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 208 | private: |
| 209 | FILE* file_; |
| 210 | void* memory_; |
| 211 | int size_; |
| 212 | }; |
| 213 | |
| 214 | |
vegorov@chromium.org | 0a4e901 | 2011-01-24 12:33:13 +0000 | [diff] [blame] | 215 | OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name) { |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 216 | FILE* file = fopen(name, "r+"); |
vegorov@chromium.org | 0a4e901 | 2011-01-24 12:33:13 +0000 | [diff] [blame] | 217 | if (file == NULL) return NULL; |
| 218 | |
| 219 | fseek(file, 0, SEEK_END); |
| 220 | int size = ftell(file); |
| 221 | |
| 222 | void* memory = |
| 223 | mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0); |
| 224 | return new PosixMemoryMappedFile(file, memory, size); |
| 225 | } |
| 226 | |
| 227 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 228 | OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size, |
| 229 | void* initial) { |
| 230 | FILE* file = fopen(name, "w+"); |
| 231 | if (file == NULL) return NULL; |
| 232 | int result = fwrite(initial, size, 1, file); |
| 233 | if (result < 1) { |
| 234 | fclose(file); |
| 235 | return NULL; |
| 236 | } |
| 237 | void* memory = |
| 238 | mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0); |
| 239 | return new PosixMemoryMappedFile(file, memory, size); |
| 240 | } |
| 241 | |
| 242 | |
| 243 | PosixMemoryMappedFile::~PosixMemoryMappedFile() { |
| 244 | if (memory_) munmap(memory_, size_); |
| 245 | fclose(file_); |
| 246 | } |
| 247 | |
| 248 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 249 | static unsigned StringToLong(char* buffer) { |
| 250 | return static_cast<unsigned>(strtol(buffer, NULL, 16)); // NOLINT |
| 251 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 252 | |
| 253 | |
| 254 | void OS::LogSharedLibraryAddresses() { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 255 | static const int MAP_LENGTH = 1024; |
| 256 | int fd = open("/proc/self/maps", O_RDONLY); |
| 257 | if (fd < 0) return; |
| 258 | while (true) { |
| 259 | char addr_buffer[11]; |
| 260 | addr_buffer[0] = '0'; |
| 261 | addr_buffer[1] = 'x'; |
| 262 | addr_buffer[10] = 0; |
| 263 | int result = read(fd, addr_buffer + 2, 8); |
| 264 | if (result < 8) break; |
| 265 | unsigned start = StringToLong(addr_buffer); |
| 266 | result = read(fd, addr_buffer + 2, 1); |
| 267 | if (result < 1) break; |
| 268 | if (addr_buffer[2] != '-') break; |
| 269 | result = read(fd, addr_buffer + 2, 8); |
| 270 | if (result < 8) break; |
| 271 | unsigned end = StringToLong(addr_buffer); |
| 272 | char buffer[MAP_LENGTH]; |
| 273 | int bytes_read = -1; |
| 274 | do { |
| 275 | bytes_read++; |
| 276 | if (bytes_read >= MAP_LENGTH - 1) |
| 277 | break; |
| 278 | result = read(fd, buffer + bytes_read, 1); |
| 279 | if (result < 1) break; |
| 280 | } while (buffer[bytes_read] != '\n'); |
| 281 | buffer[bytes_read] = 0; |
| 282 | // Ignore mappings that are not executable. |
| 283 | if (buffer[3] != 'x') continue; |
| 284 | char* start_of_path = index(buffer, '/'); |
| 285 | // There may be no filename in this line. Skip to next. |
| 286 | if (start_of_path == NULL) continue; |
| 287 | buffer[bytes_read] = 0; |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 288 | LOG(i::Isolate::Current(), SharedLibraryEvent(start_of_path, start, end)); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 289 | } |
| 290 | close(fd); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 291 | } |
| 292 | |
| 293 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 294 | void OS::SignalCodeMovingGC() { |
| 295 | } |
| 296 | |
| 297 | |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 298 | int OS::StackWalk(Vector<OS::StackFrame> frames) { |
| 299 | int frames_size = frames.length(); |
sgjesse@chromium.org | 720dc0b | 2010-05-10 09:25:39 +0000 | [diff] [blame] | 300 | ScopedVector<void*> addresses(frames_size); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 301 | |
sgjesse@chromium.org | 720dc0b | 2010-05-10 09:25:39 +0000 | [diff] [blame] | 302 | int frames_count = backtrace(addresses.start(), frames_size); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 303 | |
kmillikin@chromium.org | 9155e25 | 2010-05-26 13:27:57 +0000 | [diff] [blame] | 304 | char** symbols = backtrace_symbols(addresses.start(), frames_count); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 305 | if (symbols == NULL) { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 306 | return kStackWalkError; |
| 307 | } |
| 308 | |
| 309 | for (int i = 0; i < frames_count; i++) { |
| 310 | frames[i].address = addresses[i]; |
| 311 | // Format a text representation of the frame based on the information |
| 312 | // available. |
| 313 | SNPrintF(MutableCStrVector(frames[i].text, kStackWalkMaxTextLen), |
| 314 | "%s", |
| 315 | symbols[i]); |
| 316 | // Make sure line termination is in place. |
| 317 | frames[i].text[kStackWalkMaxTextLen - 1] = '\0'; |
| 318 | } |
| 319 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 320 | free(symbols); |
| 321 | |
| 322 | return frames_count; |
| 323 | } |
| 324 | |
| 325 | |
| 326 | // Constants used for mmap. |
| 327 | static const int kMmapFd = -1; |
| 328 | static const int kMmapFdOffset = 0; |
| 329 | |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 330 | VirtualMemory::VirtualMemory() : address_(NULL), size_(0) { } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 331 | |
| 332 | VirtualMemory::VirtualMemory(size_t size) { |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 333 | address_ = ReserveRegion(size); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 334 | size_ = size; |
| 335 | } |
| 336 | |
| 337 | |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 338 | VirtualMemory::VirtualMemory(size_t size, size_t alignment) |
| 339 | : address_(NULL), size_(0) { |
| 340 | ASSERT(IsAligned(alignment, static_cast<intptr_t>(OS::AllocateAlignment()))); |
| 341 | size_t request_size = RoundUp(size + alignment, |
| 342 | static_cast<intptr_t>(OS::AllocateAlignment())); |
| 343 | void* reservation = mmap(OS::GetRandomMmapAddr(), |
| 344 | request_size, |
| 345 | PROT_NONE, |
| 346 | MAP_PRIVATE | MAP_ANON | MAP_NORESERVE, |
| 347 | kMmapFd, |
| 348 | kMmapFdOffset); |
| 349 | if (reservation == MAP_FAILED) return; |
| 350 | |
| 351 | Address base = static_cast<Address>(reservation); |
| 352 | Address aligned_base = RoundUp(base, alignment); |
| 353 | ASSERT_LE(base, aligned_base); |
| 354 | |
| 355 | // Unmap extra memory reserved before and after the desired block. |
| 356 | if (aligned_base != base) { |
| 357 | size_t prefix_size = static_cast<size_t>(aligned_base - base); |
| 358 | OS::Free(base, prefix_size); |
| 359 | request_size -= prefix_size; |
| 360 | } |
| 361 | |
| 362 | size_t aligned_size = RoundUp(size, OS::AllocateAlignment()); |
| 363 | ASSERT_LE(aligned_size, request_size); |
| 364 | |
| 365 | if (aligned_size != request_size) { |
| 366 | size_t suffix_size = request_size - aligned_size; |
| 367 | OS::Free(aligned_base + aligned_size, suffix_size); |
| 368 | request_size -= suffix_size; |
| 369 | } |
| 370 | |
| 371 | ASSERT(aligned_size == request_size); |
| 372 | |
| 373 | address_ = static_cast<void*>(aligned_base); |
| 374 | size_ = aligned_size; |
| 375 | } |
| 376 | |
| 377 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 378 | VirtualMemory::~VirtualMemory() { |
| 379 | if (IsReserved()) { |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 380 | bool result = ReleaseRegion(address(), size()); |
| 381 | ASSERT(result); |
| 382 | USE(result); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 383 | } |
| 384 | } |
| 385 | |
| 386 | |
| 387 | bool VirtualMemory::IsReserved() { |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 388 | return address_ != NULL; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 389 | } |
| 390 | |
| 391 | |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 392 | void VirtualMemory::Reset() { |
| 393 | address_ = NULL; |
| 394 | size_ = 0; |
| 395 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 396 | |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 397 | |
| 398 | bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) { |
| 399 | return CommitRegion(address, size, is_executable); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 400 | } |
| 401 | |
| 402 | |
| 403 | bool VirtualMemory::Uncommit(void* address, size_t size) { |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 404 | return UncommitRegion(address, size); |
| 405 | } |
| 406 | |
| 407 | |
yangguo@chromium.org | ab30bb8 | 2012-02-24 14:41:46 +0000 | [diff] [blame] | 408 | bool VirtualMemory::Guard(void* address) { |
| 409 | OS::Guard(address, OS::CommitPageSize()); |
| 410 | return true; |
| 411 | } |
| 412 | |
| 413 | |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 414 | void* VirtualMemory::ReserveRegion(size_t size) { |
| 415 | void* result = mmap(OS::GetRandomMmapAddr(), |
| 416 | size, |
| 417 | PROT_NONE, |
| 418 | MAP_PRIVATE | MAP_ANON | MAP_NORESERVE, |
| 419 | kMmapFd, |
| 420 | kMmapFdOffset); |
| 421 | |
| 422 | if (result == MAP_FAILED) return NULL; |
| 423 | |
| 424 | return result; |
| 425 | } |
| 426 | |
| 427 | |
| 428 | bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) { |
| 429 | int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); |
| 430 | if (MAP_FAILED == mmap(base, |
| 431 | size, |
| 432 | prot, |
| 433 | MAP_PRIVATE | MAP_ANON | MAP_FIXED, |
| 434 | kMmapFd, |
| 435 | kMmapFdOffset)) { |
| 436 | return false; |
| 437 | } |
| 438 | |
| 439 | UpdateAllocatedSpaceLimits(base, size); |
| 440 | return true; |
| 441 | } |
| 442 | |
| 443 | |
| 444 | bool VirtualMemory::UncommitRegion(void* base, size_t size) { |
| 445 | return mmap(base, |
| 446 | size, |
| 447 | PROT_NONE, |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 448 | MAP_PRIVATE | MAP_ANON | MAP_NORESERVE | MAP_FIXED, |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 449 | kMmapFd, |
| 450 | kMmapFdOffset) != MAP_FAILED; |
| 451 | } |
| 452 | |
| 453 | |
| 454 | bool VirtualMemory::ReleaseRegion(void* base, size_t size) { |
| 455 | return munmap(base, size) == 0; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 456 | } |
| 457 | |
| 458 | |
ager@chromium.org | a9aa5fa | 2011-04-13 08:46:07 +0000 | [diff] [blame] | 459 | class Thread::PlatformData : public Malloced { |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 460 | public: |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 461 | pthread_t thread_; // Thread handle for pthread. |
| 462 | }; |
| 463 | |
| 464 | |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 465 | Thread::Thread(const Options& options) |
ager@chromium.org | a9aa5fa | 2011-04-13 08:46:07 +0000 | [diff] [blame] | 466 | : data_(new PlatformData), |
yangguo@chromium.org | 659ceec | 2012-01-26 07:37:54 +0000 | [diff] [blame] | 467 | stack_size_(options.stack_size()) { |
| 468 | set_name(options.name()); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 469 | } |
| 470 | |
| 471 | |
| 472 | Thread::~Thread() { |
ager@chromium.org | a9aa5fa | 2011-04-13 08:46:07 +0000 | [diff] [blame] | 473 | delete data_; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 474 | } |
| 475 | |
| 476 | |
| 477 | static void* ThreadEntry(void* arg) { |
| 478 | Thread* thread = reinterpret_cast<Thread*>(arg); |
| 479 | // This is also initialized by the first argument to pthread_create() but we |
| 480 | // don't know which thread will run first (the original thread or the new |
| 481 | // one) so we initialize it here too. |
lrn@chromium.org | 1c09276 | 2011-05-09 09:42:16 +0000 | [diff] [blame] | 482 | thread->data()->thread_ = pthread_self(); |
| 483 | ASSERT(thread->data()->thread_ != kNoThread); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 484 | thread->Run(); |
| 485 | return NULL; |
| 486 | } |
| 487 | |
| 488 | |
lrn@chromium.org | 5d00b60 | 2011-01-05 09:51:43 +0000 | [diff] [blame] | 489 | void Thread::set_name(const char* name) { |
| 490 | strncpy(name_, name, sizeof(name_)); |
| 491 | name_[sizeof(name_) - 1] = '\0'; |
| 492 | } |
| 493 | |
| 494 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 495 | void Thread::Start() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 496 | pthread_attr_t* attr_ptr = NULL; |
| 497 | pthread_attr_t attr; |
| 498 | if (stack_size_ > 0) { |
| 499 | pthread_attr_init(&attr); |
| 500 | pthread_attr_setstacksize(&attr, static_cast<size_t>(stack_size_)); |
| 501 | attr_ptr = &attr; |
| 502 | } |
lrn@chromium.org | 1c09276 | 2011-05-09 09:42:16 +0000 | [diff] [blame] | 503 | pthread_create(&data_->thread_, attr_ptr, ThreadEntry, this); |
| 504 | ASSERT(data_->thread_ != kNoThread); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 505 | } |
| 506 | |
| 507 | |
| 508 | void Thread::Join() { |
lrn@chromium.org | 1c09276 | 2011-05-09 09:42:16 +0000 | [diff] [blame] | 509 | pthread_join(data_->thread_, NULL); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 510 | } |
| 511 | |
| 512 | |
| 513 | Thread::LocalStorageKey Thread::CreateThreadLocalKey() { |
| 514 | pthread_key_t key; |
| 515 | int result = pthread_key_create(&key, NULL); |
| 516 | USE(result); |
| 517 | ASSERT(result == 0); |
| 518 | return static_cast<LocalStorageKey>(key); |
| 519 | } |
| 520 | |
| 521 | |
| 522 | void Thread::DeleteThreadLocalKey(LocalStorageKey key) { |
| 523 | pthread_key_t pthread_key = static_cast<pthread_key_t>(key); |
| 524 | int result = pthread_key_delete(pthread_key); |
| 525 | USE(result); |
| 526 | ASSERT(result == 0); |
| 527 | } |
| 528 | |
| 529 | |
| 530 | void* Thread::GetThreadLocal(LocalStorageKey key) { |
| 531 | pthread_key_t pthread_key = static_cast<pthread_key_t>(key); |
| 532 | return pthread_getspecific(pthread_key); |
| 533 | } |
| 534 | |
| 535 | |
| 536 | void Thread::SetThreadLocal(LocalStorageKey key, void* value) { |
| 537 | pthread_key_t pthread_key = static_cast<pthread_key_t>(key); |
| 538 | pthread_setspecific(pthread_key, value); |
| 539 | } |
| 540 | |
| 541 | |
| 542 | void Thread::YieldCPU() { |
| 543 | sched_yield(); |
| 544 | } |
| 545 | |
| 546 | |
| 547 | class FreeBSDMutex : public Mutex { |
| 548 | public: |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 549 | FreeBSDMutex() { |
| 550 | pthread_mutexattr_t attrs; |
| 551 | int result = pthread_mutexattr_init(&attrs); |
| 552 | ASSERT(result == 0); |
| 553 | result = pthread_mutexattr_settype(&attrs, PTHREAD_MUTEX_RECURSIVE); |
| 554 | ASSERT(result == 0); |
| 555 | result = pthread_mutex_init(&mutex_, &attrs); |
| 556 | ASSERT(result == 0); |
yangguo@chromium.org | cb9affa | 2012-05-15 12:16:38 +0000 | [diff] [blame] | 557 | USE(result); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 558 | } |
| 559 | |
| 560 | virtual ~FreeBSDMutex() { pthread_mutex_destroy(&mutex_); } |
| 561 | |
| 562 | virtual int Lock() { |
| 563 | int result = pthread_mutex_lock(&mutex_); |
| 564 | return result; |
| 565 | } |
| 566 | |
| 567 | virtual int Unlock() { |
| 568 | int result = pthread_mutex_unlock(&mutex_); |
| 569 | return result; |
| 570 | } |
| 571 | |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 572 | virtual bool TryLock() { |
| 573 | int result = pthread_mutex_trylock(&mutex_); |
| 574 | // Return false if the lock is busy and locking failed. |
| 575 | if (result == EBUSY) { |
| 576 | return false; |
| 577 | } |
| 578 | ASSERT(result == 0); // Verify no other errors. |
| 579 | return true; |
| 580 | } |
| 581 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 582 | private: |
| 583 | pthread_mutex_t mutex_; // Pthread mutex for POSIX platforms. |
| 584 | }; |
| 585 | |
| 586 | |
| 587 | Mutex* OS::CreateMutex() { |
| 588 | return new FreeBSDMutex(); |
| 589 | } |
| 590 | |
| 591 | |
| 592 | class FreeBSDSemaphore : public Semaphore { |
| 593 | public: |
| 594 | explicit FreeBSDSemaphore(int count) { sem_init(&sem_, 0, count); } |
| 595 | virtual ~FreeBSDSemaphore() { sem_destroy(&sem_); } |
| 596 | |
| 597 | virtual void Wait(); |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 598 | virtual bool Wait(int timeout); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 599 | virtual void Signal() { sem_post(&sem_); } |
| 600 | private: |
| 601 | sem_t sem_; |
| 602 | }; |
| 603 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 604 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 605 | void FreeBSDSemaphore::Wait() { |
| 606 | while (true) { |
| 607 | int result = sem_wait(&sem_); |
| 608 | if (result == 0) return; // Successfully got semaphore. |
| 609 | CHECK(result == -1 && errno == EINTR); // Signal caused spurious wakeup. |
| 610 | } |
| 611 | } |
| 612 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 613 | |
| 614 | bool FreeBSDSemaphore::Wait(int timeout) { |
| 615 | const long kOneSecondMicros = 1000000; // NOLINT |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 616 | |
| 617 | // Split timeout into second and nanosecond parts. |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 618 | struct timeval delta; |
| 619 | delta.tv_usec = timeout % kOneSecondMicros; |
| 620 | delta.tv_sec = timeout / kOneSecondMicros; |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 621 | |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 622 | struct timeval current_time; |
| 623 | // Get the current time. |
| 624 | if (gettimeofday(¤t_time, NULL) == -1) { |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 625 | return false; |
| 626 | } |
| 627 | |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 628 | // Calculate time for end of timeout. |
| 629 | struct timeval end_time; |
| 630 | timeradd(¤t_time, &delta, &end_time); |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 631 | |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 632 | struct timespec ts; |
| 633 | TIMEVAL_TO_TIMESPEC(&end_time, &ts); |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 634 | while (true) { |
| 635 | int result = sem_timedwait(&sem_, &ts); |
| 636 | if (result == 0) return true; // Successfully got semaphore. |
| 637 | if (result == -1 && errno == ETIMEDOUT) return false; // Timeout. |
| 638 | CHECK(result == -1 && errno == EINTR); // Signal caused spurious wakeup. |
| 639 | } |
| 640 | } |
| 641 | |
| 642 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 643 | Semaphore* OS::CreateSemaphore(int count) { |
| 644 | return new FreeBSDSemaphore(count); |
| 645 | } |
| 646 | |
ager@chromium.org | 381abbb | 2009-02-25 13:23:22 +0000 | [diff] [blame] | 647 | |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 648 | static pthread_t GetThreadID() { |
| 649 | pthread_t thread_id = pthread_self(); |
| 650 | return thread_id; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 651 | } |
| 652 | |
| 653 | |
| 654 | class Sampler::PlatformData : public Malloced { |
| 655 | public: |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 656 | PlatformData() : vm_tid_(GetThreadID()) {} |
| 657 | |
| 658 | pthread_t vm_tid() const { return vm_tid_; } |
| 659 | |
| 660 | private: |
| 661 | pthread_t vm_tid_; |
| 662 | }; |
| 663 | |
| 664 | |
| 665 | static void ProfilerSignalHandler(int signal, siginfo_t* info, void* context) { |
| 666 | USE(info); |
| 667 | if (signal != SIGPROF) return; |
| 668 | Isolate* isolate = Isolate::UncheckedCurrent(); |
| 669 | if (isolate == NULL || !isolate->IsInitialized() || !isolate->IsInUse()) { |
| 670 | // We require a fully initialized and entered isolate. |
| 671 | return; |
| 672 | } |
vitalyr@chromium.org | 0ec56d6 | 2011-04-15 22:22:08 +0000 | [diff] [blame] | 673 | if (v8::Locker::IsActive() && |
| 674 | !isolate->thread_manager()->IsLockedByCurrentThread()) { |
| 675 | return; |
| 676 | } |
| 677 | |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 678 | Sampler* sampler = isolate->logger()->sampler(); |
| 679 | if (sampler == NULL || !sampler->IsActive()) return; |
| 680 | |
| 681 | TickSample sample_obj; |
| 682 | TickSample* sample = CpuProfiler::TickSampleEvent(isolate); |
| 683 | if (sample == NULL) sample = &sample_obj; |
| 684 | |
| 685 | // Extracting the sample from the context is extremely machine dependent. |
| 686 | ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(context); |
| 687 | mcontext_t& mcontext = ucontext->uc_mcontext; |
| 688 | sample->state = isolate->current_vm_state(); |
| 689 | #if V8_HOST_ARCH_IA32 |
| 690 | sample->pc = reinterpret_cast<Address>(mcontext.mc_eip); |
| 691 | sample->sp = reinterpret_cast<Address>(mcontext.mc_esp); |
| 692 | sample->fp = reinterpret_cast<Address>(mcontext.mc_ebp); |
| 693 | #elif V8_HOST_ARCH_X64 |
| 694 | sample->pc = reinterpret_cast<Address>(mcontext.mc_rip); |
| 695 | sample->sp = reinterpret_cast<Address>(mcontext.mc_rsp); |
| 696 | sample->fp = reinterpret_cast<Address>(mcontext.mc_rbp); |
| 697 | #elif V8_HOST_ARCH_ARM |
| 698 | sample->pc = reinterpret_cast<Address>(mcontext.mc_r15); |
| 699 | sample->sp = reinterpret_cast<Address>(mcontext.mc_r13); |
| 700 | sample->fp = reinterpret_cast<Address>(mcontext.mc_r11); |
| 701 | #endif |
| 702 | sampler->SampleStack(sample); |
| 703 | sampler->Tick(sample); |
| 704 | } |
| 705 | |
| 706 | |
| 707 | class SignalSender : public Thread { |
| 708 | public: |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 709 | enum SleepInterval { |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 710 | HALF_INTERVAL, |
| 711 | FULL_INTERVAL |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 712 | }; |
| 713 | |
jkummerow@chromium.org | ab7dad4 | 2012-02-07 12:07:34 +0000 | [diff] [blame] | 714 | static const int kSignalSenderStackSize = 64 * KB; |
yangguo@chromium.org | 659ceec | 2012-01-26 07:37:54 +0000 | [diff] [blame] | 715 | |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 716 | explicit SignalSender(int interval) |
yangguo@chromium.org | 659ceec | 2012-01-26 07:37:54 +0000 | [diff] [blame] | 717 | : Thread(Thread::Options("SignalSender", kSignalSenderStackSize)), |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 718 | interval_(interval) {} |
| 719 | |
erik.corry@gmail.com | ed49e96 | 2012-04-17 11:57:53 +0000 | [diff] [blame] | 720 | static void SetUp() { if (!mutex_) mutex_ = OS::CreateMutex(); } |
| 721 | static void TearDown() { delete mutex_; } |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 722 | |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 723 | static void AddActiveSampler(Sampler* sampler) { |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 724 | ScopedLock lock(mutex_); |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 725 | SamplerRegistry::AddActiveSampler(sampler); |
| 726 | if (instance_ == NULL) { |
| 727 | // Install a signal handler. |
| 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); |
| 734 | |
| 735 | // Start a thread that sends SIGPROF signal to VM threads. |
| 736 | instance_ = new SignalSender(sampler->interval()); |
| 737 | instance_->Start(); |
| 738 | } else { |
| 739 | ASSERT(instance_->interval_ == sampler->interval()); |
| 740 | } |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 741 | } |
| 742 | |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 743 | static void RemoveActiveSampler(Sampler* sampler) { |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 744 | ScopedLock lock(mutex_); |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 745 | SamplerRegistry::RemoveActiveSampler(sampler); |
| 746 | if (SamplerRegistry::GetState() == SamplerRegistry::HAS_NO_SAMPLERS) { |
jkummerow@chromium.org | ddda9e8 | 2011-07-06 11:27:02 +0000 | [diff] [blame] | 747 | RuntimeProfiler::StopRuntimeProfilerThreadBeforeShutdown(instance_); |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 748 | delete instance_; |
| 749 | instance_ = NULL; |
| 750 | |
| 751 | // Restore the old signal handler. |
| 752 | if (signal_handler_installed_) { |
| 753 | sigaction(SIGPROF, &old_signal_handler_, 0); |
| 754 | signal_handler_installed_ = false; |
| 755 | } |
| 756 | } |
| 757 | } |
| 758 | |
| 759 | // Implement Thread::Run(). |
| 760 | virtual void Run() { |
| 761 | SamplerRegistry::State state; |
| 762 | while ((state = SamplerRegistry::GetState()) != |
| 763 | SamplerRegistry::HAS_NO_SAMPLERS) { |
| 764 | bool cpu_profiling_enabled = |
| 765 | (state == SamplerRegistry::HAS_CPU_PROFILING_SAMPLERS); |
| 766 | bool runtime_profiler_enabled = RuntimeProfiler::IsEnabled(); |
| 767 | // When CPU profiling is enabled both JavaScript and C++ code is |
| 768 | // profiled. We must not suspend. |
| 769 | if (!cpu_profiling_enabled) { |
| 770 | if (rate_limiter_.SuspendIfNecessary()) continue; |
| 771 | } |
| 772 | if (cpu_profiling_enabled && runtime_profiler_enabled) { |
| 773 | if (!SamplerRegistry::IterateActiveSamplers(&DoCpuProfile, this)) { |
| 774 | return; |
| 775 | } |
| 776 | Sleep(HALF_INTERVAL); |
| 777 | if (!SamplerRegistry::IterateActiveSamplers(&DoRuntimeProfile, NULL)) { |
| 778 | return; |
| 779 | } |
| 780 | Sleep(HALF_INTERVAL); |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 781 | } else { |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 782 | if (cpu_profiling_enabled) { |
| 783 | if (!SamplerRegistry::IterateActiveSamplers(&DoCpuProfile, |
| 784 | this)) { |
| 785 | return; |
| 786 | } |
| 787 | } |
| 788 | if (runtime_profiler_enabled) { |
| 789 | if (!SamplerRegistry::IterateActiveSamplers(&DoRuntimeProfile, |
| 790 | NULL)) { |
| 791 | return; |
| 792 | } |
| 793 | } |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 794 | Sleep(FULL_INTERVAL); |
| 795 | } |
| 796 | } |
| 797 | } |
| 798 | |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 799 | static void DoCpuProfile(Sampler* sampler, void* raw_sender) { |
| 800 | if (!sampler->IsProfiling()) return; |
| 801 | SignalSender* sender = reinterpret_cast<SignalSender*>(raw_sender); |
| 802 | sender->SendProfilingSignal(sampler->platform_data()->vm_tid()); |
| 803 | } |
| 804 | |
| 805 | static void DoRuntimeProfile(Sampler* sampler, void* ignored) { |
| 806 | if (!sampler->isolate()->IsInitialized()) return; |
| 807 | sampler->isolate()->runtime_profiler()->NotifyTick(); |
| 808 | } |
| 809 | |
| 810 | void SendProfilingSignal(pthread_t tid) { |
| 811 | if (!signal_handler_installed_) return; |
| 812 | pthread_kill(tid, SIGPROF); |
| 813 | } |
| 814 | |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 815 | void Sleep(SleepInterval full_or_half) { |
| 816 | // Convert ms to us and subtract 100 us to compensate delays |
| 817 | // occuring during signal delivery. |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 818 | useconds_t interval = interval_ * 1000 - 100; |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 819 | if (full_or_half == HALF_INTERVAL) interval /= 2; |
| 820 | int result = usleep(interval); |
| 821 | #ifdef DEBUG |
| 822 | if (result != 0 && errno != EINTR) { |
| 823 | fprintf(stderr, |
| 824 | "SignalSender usleep error; interval = %u, errno = %d\n", |
| 825 | interval, |
| 826 | errno); |
| 827 | ASSERT(result == 0 || errno == EINTR); |
| 828 | } |
| 829 | #endif |
| 830 | USE(result); |
| 831 | } |
| 832 | |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 833 | const int interval_; |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 834 | RuntimeProfilerRateLimiter rate_limiter_; |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 835 | |
| 836 | // Protects the process wide state below. |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 837 | static Mutex* mutex_; |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 838 | static SignalSender* instance_; |
| 839 | static bool signal_handler_installed_; |
| 840 | static struct sigaction old_signal_handler_; |
| 841 | |
jkummerow@chromium.org | 05ed9dd | 2012-01-23 14:42:48 +0000 | [diff] [blame] | 842 | private: |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 843 | DISALLOW_COPY_AND_ASSIGN(SignalSender); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 844 | }; |
| 845 | |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 846 | Mutex* SignalSender::mutex_ = NULL; |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 847 | SignalSender* SignalSender::instance_ = NULL; |
| 848 | struct sigaction SignalSender::old_signal_handler_; |
| 849 | bool SignalSender::signal_handler_installed_ = false; |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 850 | |
| 851 | |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 852 | void OS::SetUp() { |
| 853 | // Seed the random number generator. |
| 854 | // Convert the current time to a 64-bit integer first, before converting it |
| 855 | // to an unsigned. Going directly can cause an overflow and the seed to be |
| 856 | // set to all ones. The seed will be identical for different instances that |
| 857 | // call this setup code within the same millisecond. |
| 858 | uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis()); |
| 859 | srandom(static_cast<unsigned int>(seed)); |
| 860 | limit_mutex = CreateMutex(); |
| 861 | SignalSender::SetUp(); |
| 862 | } |
| 863 | |
| 864 | |
erik.corry@gmail.com | ed49e96 | 2012-04-17 11:57:53 +0000 | [diff] [blame] | 865 | void OS::TearDown() { |
| 866 | SignalSender::TearDown(); |
| 867 | delete limit_mutex; |
| 868 | } |
| 869 | |
| 870 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 871 | Sampler::Sampler(Isolate* isolate, int interval) |
| 872 | : isolate_(isolate), |
| 873 | interval_(interval), |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 874 | profiling_(false), |
ager@chromium.org | beb2571 | 2010-11-29 08:02:25 +0000 | [diff] [blame] | 875 | active_(false), |
| 876 | samples_taken_(0) { |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 877 | data_ = new PlatformData; |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 878 | } |
| 879 | |
| 880 | |
| 881 | Sampler::~Sampler() { |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 882 | ASSERT(!IsActive()); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 883 | delete data_; |
| 884 | } |
| 885 | |
| 886 | |
| 887 | void Sampler::Start() { |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 888 | ASSERT(!IsActive()); |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 889 | SetActive(true); |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 890 | SignalSender::AddActiveSampler(this); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 891 | } |
| 892 | |
| 893 | |
| 894 | void Sampler::Stop() { |
lrn@chromium.org | 7516f05 | 2011-03-30 08:52:27 +0000 | [diff] [blame] | 895 | ASSERT(IsActive()); |
| 896 | SignalSender::RemoveActiveSampler(this); |
ricow@chromium.org | badaffc | 2011-03-17 12:15:27 +0000 | [diff] [blame] | 897 | SetActive(false); |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 898 | } |
| 899 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 900 | |
| 901 | } } // namespace v8::internal |