jkummerow@chromium.org | 05ed9dd | 2012-01-23 14:42:48 +0000 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +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 | |
rossberg@chromium.org | fab1498 | 2012-01-05 15:02:15 +0000 | [diff] [blame] | 28 | // Platform specific code for OpenBSD and NetBSD goes here. For the POSIX |
| 29 | // comaptible parts the implementation is in platform-posix.cc. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +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> |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 36 | #include <sys/syscall.h> |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 37 | #include <sys/types.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 |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 43 | #include <fcntl.h> // open |
| 44 | #include <unistd.h> // sysconf |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 45 | #include <execinfo.h> // backtrace, backtrace_symbols |
| 46 | #include <strings.h> // index |
| 47 | #include <errno.h> |
| 48 | #include <stdarg.h> |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 49 | |
| 50 | #undef MAP_TYPE |
| 51 | |
| 52 | #include "v8.h" |
| 53 | |
danno@chromium.org | 8c0a43f | 2012-04-03 08:37:53 +0000 | [diff] [blame] | 54 | #include "platform-posix.h" |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 55 | #include "platform.h" |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 56 | #include "v8threads.h" |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 57 | #include "vm-state-inl.h" |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 58 | |
| 59 | |
| 60 | namespace v8 { |
| 61 | namespace internal { |
| 62 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 63 | // 0 is never a valid thread id on Linux and OpenBSD since tids and pids share a |
| 64 | // name space and pid 0 is reserved (see man 2 kill). |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 65 | static const pthread_t kNoThread = (pthread_t) 0; |
| 66 | |
| 67 | |
| 68 | double ceiling(double x) { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 69 | return ceil(x); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 70 | } |
| 71 | |
| 72 | |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 73 | static Mutex* limit_mutex = NULL; |
| 74 | |
| 75 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 76 | static void* GetRandomMmapAddr() { |
| 77 | Isolate* isolate = Isolate::UncheckedCurrent(); |
| 78 | // Note that the current isolate isn't set up in a call path via |
| 79 | // CpuFeatures::Probe. We don't care about randomization in this case because |
| 80 | // the code page is immediately freed. |
| 81 | if (isolate != NULL) { |
| 82 | #ifdef V8_TARGET_ARCH_X64 |
| 83 | uint64_t rnd1 = V8::RandomPrivate(isolate); |
| 84 | uint64_t rnd2 = V8::RandomPrivate(isolate); |
| 85 | uint64_t raw_addr = (rnd1 << 32) ^ rnd2; |
| 86 | // Currently available CPUs have 48 bits of virtual addressing. Truncate |
| 87 | // the hint address to 46 bits to give the kernel a fighting chance of |
| 88 | // fulfilling our placement request. |
| 89 | raw_addr &= V8_UINT64_C(0x3ffffffff000); |
| 90 | #else |
| 91 | uint32_t raw_addr = V8::RandomPrivate(isolate); |
| 92 | // The range 0x20000000 - 0x60000000 is relatively unpopulated across a |
| 93 | // variety of ASLR modes (PAE kernel, NX compat mode, etc). |
| 94 | raw_addr &= 0x3ffff000; |
| 95 | raw_addr += 0x20000000; |
| 96 | #endif |
| 97 | return reinterpret_cast<void*>(raw_addr); |
| 98 | } |
| 99 | return NULL; |
| 100 | } |
| 101 | |
| 102 | |
danno@chromium.org | 8c0a43f | 2012-04-03 08:37:53 +0000 | [diff] [blame] | 103 | void OS::PostSetUp() { |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 104 | POSIXPostSetUp(); |
danno@chromium.org | 8c0a43f | 2012-04-03 08:37:53 +0000 | [diff] [blame] | 105 | } |
| 106 | |
| 107 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 108 | uint64_t OS::CpuFeaturesImpliedByPlatform() { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 109 | return 0; |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 110 | } |
| 111 | |
| 112 | |
| 113 | int OS::ActivationFrameAlignment() { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 114 | // With gcc 4.4 the tree vectorization optimizer can generate code |
| 115 | // that requires 16 byte alignment such as movdqa on x86. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 116 | return 16; |
| 117 | } |
| 118 | |
| 119 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 120 | void OS::ReleaseStore(volatile AtomicWord* ptr, AtomicWord value) { |
| 121 | __asm__ __volatile__("" : : : "memory"); |
| 122 | // An x86 store acts as a release barrier. |
| 123 | *ptr = value; |
| 124 | } |
| 125 | |
| 126 | |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 127 | const char* OS::LocalTimezone(double time) { |
| 128 | if (isnan(time)) return ""; |
| 129 | time_t tv = static_cast<time_t>(floor(time/msPerSecond)); |
| 130 | struct tm* t = localtime(&tv); |
| 131 | if (NULL == t) return ""; |
| 132 | return t->tm_zone; |
| 133 | } |
| 134 | |
| 135 | |
| 136 | double OS::LocalTimeOffset() { |
| 137 | time_t tv = time(NULL); |
| 138 | struct tm* t = localtime(&tv); |
| 139 | // tm_gmtoff includes any daylight savings offset, so subtract it. |
| 140 | return static_cast<double>(t->tm_gmtoff * msPerSecond - |
| 141 | (t->tm_isdst > 0 ? 3600 * msPerSecond : 0)); |
| 142 | } |
| 143 | |
| 144 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 145 | // We keep the lowest and highest addresses mapped as a quick way of |
| 146 | // determining that pointers are outside the heap (used mostly in assertions |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 147 | // and verification). The estimate is conservative, i.e., not all addresses in |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 148 | // 'allocated' space are actually allocated to our heap. The range is |
| 149 | // [lowest, highest), inclusive on the low and and exclusive on the high end. |
| 150 | static void* lowest_ever_allocated = reinterpret_cast<void*>(-1); |
| 151 | static void* highest_ever_allocated = reinterpret_cast<void*>(0); |
| 152 | |
| 153 | |
| 154 | static void UpdateAllocatedSpaceLimits(void* address, int size) { |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 155 | ASSERT(limit_mutex != NULL); |
| 156 | ScopedLock lock(limit_mutex); |
| 157 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 158 | lowest_ever_allocated = Min(lowest_ever_allocated, address); |
| 159 | highest_ever_allocated = |
| 160 | Max(highest_ever_allocated, |
| 161 | reinterpret_cast<void*>(reinterpret_cast<char*>(address) + size)); |
| 162 | } |
| 163 | |
| 164 | |
| 165 | bool OS::IsOutsideAllocatedSpace(void* address) { |
| 166 | return address < lowest_ever_allocated || address >= highest_ever_allocated; |
| 167 | } |
| 168 | |
| 169 | |
| 170 | size_t OS::AllocateAlignment() { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 171 | return sysconf(_SC_PAGESIZE); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 172 | } |
| 173 | |
| 174 | |
| 175 | void* OS::Allocate(const size_t requested, |
| 176 | size_t* allocated, |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 177 | bool is_executable) { |
| 178 | const size_t msize = RoundUp(requested, AllocateAlignment()); |
| 179 | int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); |
| 180 | void* addr = GetRandomMmapAddr(); |
| 181 | void* mbase = mmap(addr, msize, prot, MAP_PRIVATE | MAP_ANON, -1, 0); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 182 | if (mbase == MAP_FAILED) { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 183 | LOG(i::Isolate::Current(), |
| 184 | StringEvent("OS::Allocate", "mmap failed")); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 185 | return NULL; |
| 186 | } |
| 187 | *allocated = msize; |
| 188 | UpdateAllocatedSpaceLimits(mbase, msize); |
| 189 | return mbase; |
| 190 | } |
| 191 | |
| 192 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 193 | void OS::Free(void* address, const size_t size) { |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 194 | // TODO(1240712): munmap has a return value which is ignored here. |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 195 | int result = munmap(address, size); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 196 | USE(result); |
| 197 | ASSERT(result == 0); |
| 198 | } |
| 199 | |
| 200 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 201 | void OS::Sleep(int milliseconds) { |
| 202 | unsigned int ms = static_cast<unsigned int>(milliseconds); |
| 203 | usleep(1000 * ms); |
| 204 | } |
| 205 | |
| 206 | |
| 207 | void OS::Abort() { |
| 208 | // Redirect to std abort to signal abnormal program termination. |
| 209 | abort(); |
| 210 | } |
| 211 | |
| 212 | |
| 213 | void OS::DebugBreak() { |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 214 | asm("int $3"); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 215 | } |
| 216 | |
| 217 | |
| 218 | class PosixMemoryMappedFile : public OS::MemoryMappedFile { |
| 219 | public: |
| 220 | PosixMemoryMappedFile(FILE* file, void* memory, int size) |
| 221 | : file_(file), memory_(memory), size_(size) { } |
| 222 | virtual ~PosixMemoryMappedFile(); |
| 223 | virtual void* memory() { return memory_; } |
vegorov@chromium.org | 0a4e901 | 2011-01-24 12:33:13 +0000 | [diff] [blame] | 224 | virtual int size() { return size_; } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 225 | private: |
| 226 | FILE* file_; |
| 227 | void* memory_; |
| 228 | int size_; |
| 229 | }; |
| 230 | |
| 231 | |
vegorov@chromium.org | 0a4e901 | 2011-01-24 12:33:13 +0000 | [diff] [blame] | 232 | OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name) { |
fschneider@chromium.org | 3a5fd78 | 2011-02-24 10:10:44 +0000 | [diff] [blame] | 233 | FILE* file = fopen(name, "r+"); |
vegorov@chromium.org | 0a4e901 | 2011-01-24 12:33:13 +0000 | [diff] [blame] | 234 | if (file == NULL) return NULL; |
| 235 | |
| 236 | fseek(file, 0, SEEK_END); |
| 237 | int size = ftell(file); |
| 238 | |
| 239 | void* memory = |
| 240 | mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0); |
| 241 | return new PosixMemoryMappedFile(file, memory, size); |
| 242 | } |
| 243 | |
| 244 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 245 | OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size, |
| 246 | void* initial) { |
| 247 | FILE* file = fopen(name, "w+"); |
| 248 | if (file == NULL) return NULL; |
| 249 | int result = fwrite(initial, size, 1, file); |
| 250 | if (result < 1) { |
| 251 | fclose(file); |
| 252 | return NULL; |
| 253 | } |
| 254 | void* memory = |
| 255 | mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0); |
| 256 | return new PosixMemoryMappedFile(file, memory, size); |
| 257 | } |
| 258 | |
| 259 | |
| 260 | PosixMemoryMappedFile::~PosixMemoryMappedFile() { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 261 | if (memory_) OS::Free(memory_, size_); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 262 | fclose(file_); |
| 263 | } |
| 264 | |
| 265 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 266 | void OS::LogSharedLibraryAddresses() { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 267 | // This function assumes that the layout of the file is as follows: |
| 268 | // hex_start_addr-hex_end_addr rwxp <unused data> [binary_file_name] |
| 269 | // If we encounter an unexpected situation we abort scanning further entries. |
| 270 | FILE* fp = fopen("/proc/self/maps", "r"); |
| 271 | if (fp == NULL) return; |
| 272 | |
| 273 | // Allocate enough room to be able to store a full file name. |
| 274 | const int kLibNameLen = FILENAME_MAX + 1; |
| 275 | char* lib_name = reinterpret_cast<char*>(malloc(kLibNameLen)); |
| 276 | |
| 277 | i::Isolate* isolate = ISOLATE; |
| 278 | // This loop will terminate once the scanning hits an EOF. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 279 | while (true) { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 280 | uintptr_t start, end; |
| 281 | char attr_r, attr_w, attr_x, attr_p; |
| 282 | // Parse the addresses and permission bits at the beginning of the line. |
| 283 | if (fscanf(fp, "%" V8PRIxPTR "-%" V8PRIxPTR, &start, &end) != 2) break; |
| 284 | if (fscanf(fp, " %c%c%c%c", &attr_r, &attr_w, &attr_x, &attr_p) != 4) break; |
| 285 | |
| 286 | int c; |
| 287 | if (attr_r == 'r' && attr_w != 'w' && attr_x == 'x') { |
| 288 | // Found a read-only executable entry. Skip characters until we reach |
| 289 | // the beginning of the filename or the end of the line. |
| 290 | do { |
| 291 | c = getc(fp); |
| 292 | } while ((c != EOF) && (c != '\n') && (c != '/')); |
| 293 | if (c == EOF) break; // EOF: Was unexpected, just exit. |
| 294 | |
| 295 | // Process the filename if found. |
| 296 | if (c == '/') { |
| 297 | ungetc(c, fp); // Push the '/' back into the stream to be read below. |
| 298 | |
| 299 | // Read to the end of the line. Exit if the read fails. |
| 300 | if (fgets(lib_name, kLibNameLen, fp) == NULL) break; |
| 301 | |
| 302 | // Drop the newline character read by fgets. We do not need to check |
| 303 | // for a zero-length string because we know that we at least read the |
| 304 | // '/' character. |
| 305 | lib_name[strlen(lib_name) - 1] = '\0'; |
| 306 | } else { |
| 307 | // No library name found, just record the raw address range. |
| 308 | snprintf(lib_name, kLibNameLen, |
| 309 | "%08" V8PRIxPTR "-%08" V8PRIxPTR, start, end); |
| 310 | } |
| 311 | LOG(isolate, SharedLibraryEvent(lib_name, start, end)); |
| 312 | } else { |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 313 | // Entry not describing executable data. Skip to end of line to set up |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 314 | // reading the next entry. |
| 315 | do { |
| 316 | c = getc(fp); |
| 317 | } while ((c != EOF) && (c != '\n')); |
| 318 | if (c == EOF) break; |
| 319 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 320 | } |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 321 | free(lib_name); |
| 322 | fclose(fp); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 323 | } |
| 324 | |
| 325 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 326 | static const char kGCFakeMmap[] = "/tmp/__v8_gc__"; |
| 327 | |
| 328 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 329 | void OS::SignalCodeMovingGC() { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 330 | // Support for ll_prof.py. |
| 331 | // |
| 332 | // The Linux profiler built into the kernel logs all mmap's with |
| 333 | // PROT_EXEC so that analysis tools can properly attribute ticks. We |
| 334 | // do a mmap with a name known by ll_prof.py and immediately munmap |
| 335 | // it. This injects a GC marker into the stream of events generated |
| 336 | // by the kernel and allows us to synchronize V8 code log and the |
| 337 | // kernel log. |
| 338 | int size = sysconf(_SC_PAGESIZE); |
| 339 | FILE* f = fopen(kGCFakeMmap, "w+"); |
| 340 | void* addr = mmap(NULL, size, PROT_READ | PROT_EXEC, MAP_PRIVATE, |
| 341 | fileno(f), 0); |
| 342 | ASSERT(addr != MAP_FAILED); |
| 343 | OS::Free(addr, size); |
| 344 | fclose(f); |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 345 | } |
| 346 | |
| 347 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 348 | int OS::StackWalk(Vector<OS::StackFrame> frames) { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 349 | // backtrace is a glibc extension. |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 350 | int frames_size = frames.length(); |
| 351 | ScopedVector<void*> addresses(frames_size); |
| 352 | |
| 353 | int frames_count = backtrace(addresses.start(), frames_size); |
| 354 | |
| 355 | char** symbols = backtrace_symbols(addresses.start(), frames_count); |
| 356 | if (symbols == NULL) { |
| 357 | return kStackWalkError; |
| 358 | } |
| 359 | |
| 360 | for (int i = 0; i < frames_count; i++) { |
| 361 | frames[i].address = addresses[i]; |
| 362 | // Format a text representation of the frame based on the information |
| 363 | // available. |
| 364 | SNPrintF(MutableCStrVector(frames[i].text, kStackWalkMaxTextLen), |
| 365 | "%s", |
| 366 | symbols[i]); |
| 367 | // Make sure line termination is in place. |
| 368 | frames[i].text[kStackWalkMaxTextLen - 1] = '\0'; |
| 369 | } |
| 370 | |
| 371 | free(symbols); |
| 372 | |
| 373 | return frames_count; |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 374 | } |
| 375 | |
| 376 | |
| 377 | // Constants used for mmap. |
| 378 | static const int kMmapFd = -1; |
| 379 | static const int kMmapFdOffset = 0; |
| 380 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 381 | VirtualMemory::VirtualMemory() : address_(NULL), size_(0) { } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 382 | |
| 383 | VirtualMemory::VirtualMemory(size_t size) { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 384 | address_ = ReserveRegion(size); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 385 | size_ = size; |
| 386 | } |
| 387 | |
| 388 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 389 | VirtualMemory::VirtualMemory(size_t size, size_t alignment) |
| 390 | : address_(NULL), size_(0) { |
| 391 | ASSERT(IsAligned(alignment, static_cast<intptr_t>(OS::AllocateAlignment()))); |
| 392 | size_t request_size = RoundUp(size + alignment, |
| 393 | static_cast<intptr_t>(OS::AllocateAlignment())); |
| 394 | void* reservation = mmap(GetRandomMmapAddr(), |
| 395 | request_size, |
| 396 | PROT_NONE, |
| 397 | MAP_PRIVATE | MAP_ANON | MAP_NORESERVE, |
| 398 | kMmapFd, |
| 399 | kMmapFdOffset); |
| 400 | if (reservation == MAP_FAILED) return; |
| 401 | |
| 402 | Address base = static_cast<Address>(reservation); |
| 403 | Address aligned_base = RoundUp(base, alignment); |
| 404 | ASSERT_LE(base, aligned_base); |
| 405 | |
| 406 | // Unmap extra memory reserved before and after the desired block. |
| 407 | if (aligned_base != base) { |
| 408 | size_t prefix_size = static_cast<size_t>(aligned_base - base); |
| 409 | OS::Free(base, prefix_size); |
| 410 | request_size -= prefix_size; |
| 411 | } |
| 412 | |
| 413 | size_t aligned_size = RoundUp(size, OS::AllocateAlignment()); |
| 414 | ASSERT_LE(aligned_size, request_size); |
| 415 | |
| 416 | if (aligned_size != request_size) { |
| 417 | size_t suffix_size = request_size - aligned_size; |
| 418 | OS::Free(aligned_base + aligned_size, suffix_size); |
| 419 | request_size -= suffix_size; |
| 420 | } |
| 421 | |
| 422 | ASSERT(aligned_size == request_size); |
| 423 | |
| 424 | address_ = static_cast<void*>(aligned_base); |
| 425 | size_ = aligned_size; |
| 426 | } |
| 427 | |
| 428 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 429 | VirtualMemory::~VirtualMemory() { |
| 430 | if (IsReserved()) { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 431 | bool result = ReleaseRegion(address(), size()); |
| 432 | ASSERT(result); |
| 433 | USE(result); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 434 | } |
| 435 | } |
| 436 | |
| 437 | |
| 438 | bool VirtualMemory::IsReserved() { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 439 | return address_ != NULL; |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 440 | } |
| 441 | |
| 442 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 443 | void VirtualMemory::Reset() { |
| 444 | address_ = NULL; |
| 445 | size_ = 0; |
| 446 | } |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 447 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 448 | |
| 449 | bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) { |
| 450 | return CommitRegion(address, size, is_executable); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 451 | } |
| 452 | |
| 453 | |
| 454 | bool VirtualMemory::Uncommit(void* address, size_t size) { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 455 | return UncommitRegion(address, size); |
| 456 | } |
| 457 | |
| 458 | |
yangguo@chromium.org | ab30bb8 | 2012-02-24 14:41:46 +0000 | [diff] [blame] | 459 | bool VirtualMemory::Guard(void* address) { |
| 460 | OS::Guard(address, OS::CommitPageSize()); |
| 461 | return true; |
| 462 | } |
| 463 | |
| 464 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 465 | void* VirtualMemory::ReserveRegion(size_t size) { |
| 466 | void* result = mmap(GetRandomMmapAddr(), |
| 467 | size, |
| 468 | PROT_NONE, |
| 469 | MAP_PRIVATE | MAP_ANON | MAP_NORESERVE, |
| 470 | kMmapFd, |
| 471 | kMmapFdOffset); |
| 472 | |
| 473 | if (result == MAP_FAILED) return NULL; |
| 474 | |
| 475 | return result; |
| 476 | } |
| 477 | |
| 478 | |
| 479 | bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) { |
| 480 | int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); |
| 481 | if (MAP_FAILED == mmap(base, |
| 482 | size, |
| 483 | prot, |
| 484 | MAP_PRIVATE | MAP_ANON | MAP_FIXED, |
| 485 | kMmapFd, |
| 486 | kMmapFdOffset)) { |
| 487 | return false; |
| 488 | } |
| 489 | |
| 490 | UpdateAllocatedSpaceLimits(base, size); |
| 491 | return true; |
| 492 | } |
| 493 | |
| 494 | |
| 495 | bool VirtualMemory::UncommitRegion(void* base, size_t size) { |
| 496 | return mmap(base, |
| 497 | size, |
| 498 | PROT_NONE, |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 499 | MAP_PRIVATE | MAP_ANON | MAP_NORESERVE | MAP_FIXED, |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 500 | kMmapFd, |
| 501 | kMmapFdOffset) != MAP_FAILED; |
| 502 | } |
| 503 | |
| 504 | |
| 505 | bool VirtualMemory::ReleaseRegion(void* base, size_t size) { |
| 506 | return munmap(base, size) == 0; |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 507 | } |
| 508 | |
| 509 | |
ager@chromium.org | a9aa5fa | 2011-04-13 08:46:07 +0000 | [diff] [blame] | 510 | class Thread::PlatformData : public Malloced { |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 511 | public: |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 512 | PlatformData() : thread_(kNoThread) {} |
| 513 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 514 | pthread_t thread_; // Thread handle for pthread. |
| 515 | }; |
| 516 | |
svenpanne@chromium.org | 6d786c9 | 2011-06-15 10:58:27 +0000 | [diff] [blame] | 517 | Thread::Thread(const Options& options) |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 518 | : data_(new PlatformData()), |
yangguo@chromium.org | 659ceec | 2012-01-26 07:37:54 +0000 | [diff] [blame] | 519 | stack_size_(options.stack_size()) { |
| 520 | set_name(options.name()); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 521 | } |
| 522 | |
| 523 | |
| 524 | Thread::~Thread() { |
ager@chromium.org | a9aa5fa | 2011-04-13 08:46:07 +0000 | [diff] [blame] | 525 | delete data_; |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 526 | } |
| 527 | |
| 528 | |
| 529 | static void* ThreadEntry(void* arg) { |
| 530 | Thread* thread = reinterpret_cast<Thread*>(arg); |
| 531 | // This is also initialized by the first argument to pthread_create() but we |
| 532 | // don't know which thread will run first (the original thread or the new |
| 533 | // one) so we initialize it here too. |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 534 | #ifdef PR_SET_NAME |
| 535 | prctl(PR_SET_NAME, |
| 536 | reinterpret_cast<unsigned long>(thread->name()), // NOLINT |
| 537 | 0, 0, 0); |
| 538 | #endif |
ager@chromium.org | a9aa5fa | 2011-04-13 08:46:07 +0000 | [diff] [blame] | 539 | thread->data()->thread_ = pthread_self(); |
| 540 | ASSERT(thread->data()->thread_ != kNoThread); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 541 | thread->Run(); |
| 542 | return NULL; |
| 543 | } |
| 544 | |
| 545 | |
lrn@chromium.org | 5d00b60 | 2011-01-05 09:51:43 +0000 | [diff] [blame] | 546 | void Thread::set_name(const char* name) { |
| 547 | strncpy(name_, name, sizeof(name_)); |
| 548 | name_[sizeof(name_) - 1] = '\0'; |
| 549 | } |
| 550 | |
| 551 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 552 | void Thread::Start() { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 553 | pthread_attr_t* attr_ptr = NULL; |
| 554 | pthread_attr_t attr; |
| 555 | if (stack_size_ > 0) { |
| 556 | pthread_attr_init(&attr); |
| 557 | pthread_attr_setstacksize(&attr, static_cast<size_t>(stack_size_)); |
| 558 | attr_ptr = &attr; |
| 559 | } |
ager@chromium.org | a9aa5fa | 2011-04-13 08:46:07 +0000 | [diff] [blame] | 560 | pthread_create(&data_->thread_, attr_ptr, ThreadEntry, this); |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 561 | ASSERT(data_->thread_ != kNoThread); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 562 | } |
| 563 | |
| 564 | |
| 565 | void Thread::Join() { |
ager@chromium.org | a9aa5fa | 2011-04-13 08:46:07 +0000 | [diff] [blame] | 566 | pthread_join(data_->thread_, NULL); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 567 | } |
| 568 | |
| 569 | |
| 570 | Thread::LocalStorageKey Thread::CreateThreadLocalKey() { |
| 571 | pthread_key_t key; |
| 572 | int result = pthread_key_create(&key, NULL); |
| 573 | USE(result); |
| 574 | ASSERT(result == 0); |
| 575 | return static_cast<LocalStorageKey>(key); |
| 576 | } |
| 577 | |
| 578 | |
| 579 | void Thread::DeleteThreadLocalKey(LocalStorageKey key) { |
| 580 | pthread_key_t pthread_key = static_cast<pthread_key_t>(key); |
| 581 | int result = pthread_key_delete(pthread_key); |
| 582 | USE(result); |
| 583 | ASSERT(result == 0); |
| 584 | } |
| 585 | |
| 586 | |
| 587 | void* Thread::GetThreadLocal(LocalStorageKey key) { |
| 588 | pthread_key_t pthread_key = static_cast<pthread_key_t>(key); |
| 589 | return pthread_getspecific(pthread_key); |
| 590 | } |
| 591 | |
| 592 | |
| 593 | void Thread::SetThreadLocal(LocalStorageKey key, void* value) { |
| 594 | pthread_key_t pthread_key = static_cast<pthread_key_t>(key); |
| 595 | pthread_setspecific(pthread_key, value); |
| 596 | } |
| 597 | |
| 598 | |
| 599 | void Thread::YieldCPU() { |
| 600 | sched_yield(); |
| 601 | } |
| 602 | |
| 603 | |
| 604 | class OpenBSDMutex : public Mutex { |
| 605 | public: |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 606 | OpenBSDMutex() { |
| 607 | pthread_mutexattr_t attrs; |
| 608 | int result = pthread_mutexattr_init(&attrs); |
| 609 | ASSERT(result == 0); |
| 610 | result = pthread_mutexattr_settype(&attrs, PTHREAD_MUTEX_RECURSIVE); |
| 611 | ASSERT(result == 0); |
| 612 | result = pthread_mutex_init(&mutex_, &attrs); |
| 613 | ASSERT(result == 0); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 614 | USE(result); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 615 | } |
| 616 | |
| 617 | virtual ~OpenBSDMutex() { pthread_mutex_destroy(&mutex_); } |
| 618 | |
| 619 | virtual int Lock() { |
| 620 | int result = pthread_mutex_lock(&mutex_); |
| 621 | return result; |
| 622 | } |
| 623 | |
| 624 | virtual int Unlock() { |
| 625 | int result = pthread_mutex_unlock(&mutex_); |
| 626 | return result; |
| 627 | } |
| 628 | |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 629 | virtual bool TryLock() { |
| 630 | int result = pthread_mutex_trylock(&mutex_); |
| 631 | // Return false if the lock is busy and locking failed. |
| 632 | if (result == EBUSY) { |
| 633 | return false; |
| 634 | } |
| 635 | ASSERT(result == 0); // Verify no other errors. |
| 636 | return true; |
| 637 | } |
| 638 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 639 | private: |
| 640 | pthread_mutex_t mutex_; // Pthread mutex for POSIX platforms. |
| 641 | }; |
| 642 | |
| 643 | |
| 644 | Mutex* OS::CreateMutex() { |
| 645 | return new OpenBSDMutex(); |
| 646 | } |
| 647 | |
| 648 | |
| 649 | class OpenBSDSemaphore : public Semaphore { |
| 650 | public: |
| 651 | explicit OpenBSDSemaphore(int count) { sem_init(&sem_, 0, count); } |
| 652 | virtual ~OpenBSDSemaphore() { sem_destroy(&sem_); } |
| 653 | |
| 654 | virtual void Wait(); |
| 655 | virtual bool Wait(int timeout); |
| 656 | virtual void Signal() { sem_post(&sem_); } |
| 657 | private: |
| 658 | sem_t sem_; |
| 659 | }; |
| 660 | |
| 661 | |
| 662 | void OpenBSDSemaphore::Wait() { |
| 663 | while (true) { |
| 664 | int result = sem_wait(&sem_); |
| 665 | if (result == 0) return; // Successfully got semaphore. |
| 666 | CHECK(result == -1 && errno == EINTR); // Signal caused spurious wakeup. |
| 667 | } |
| 668 | } |
| 669 | |
| 670 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 671 | #ifndef TIMEVAL_TO_TIMESPEC |
| 672 | #define TIMEVAL_TO_TIMESPEC(tv, ts) do { \ |
| 673 | (ts)->tv_sec = (tv)->tv_sec; \ |
| 674 | (ts)->tv_nsec = (tv)->tv_usec * 1000; \ |
| 675 | } while (false) |
| 676 | #endif |
| 677 | |
| 678 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 679 | bool OpenBSDSemaphore::Wait(int timeout) { |
| 680 | const long kOneSecondMicros = 1000000; // NOLINT |
| 681 | |
| 682 | // Split timeout into second and nanosecond parts. |
| 683 | struct timeval delta; |
| 684 | delta.tv_usec = timeout % kOneSecondMicros; |
| 685 | delta.tv_sec = timeout / kOneSecondMicros; |
| 686 | |
| 687 | struct timeval current_time; |
| 688 | // Get the current time. |
| 689 | if (gettimeofday(¤t_time, NULL) == -1) { |
| 690 | return false; |
| 691 | } |
| 692 | |
| 693 | // Calculate time for end of timeout. |
| 694 | struct timeval end_time; |
| 695 | timeradd(¤t_time, &delta, &end_time); |
| 696 | |
| 697 | struct timespec ts; |
| 698 | TIMEVAL_TO_TIMESPEC(&end_time, &ts); |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 699 | |
| 700 | int to = ts.tv_sec; |
| 701 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 702 | while (true) { |
| 703 | int result = sem_trywait(&sem_); |
| 704 | if (result == 0) return true; // Successfully got semaphore. |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 705 | if (!to) return false; // Timeout. |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 706 | CHECK(result == -1 && errno == EINTR); // Signal caused spurious wakeup. |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 707 | usleep(ts.tv_nsec / 1000); |
| 708 | to--; |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 709 | } |
| 710 | } |
| 711 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 712 | Semaphore* OS::CreateSemaphore(int count) { |
| 713 | return new OpenBSDSemaphore(count); |
| 714 | } |
| 715 | |
| 716 | |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 717 | static pthread_t GetThreadID() { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 718 | return pthread_self(); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 719 | } |
| 720 | |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 721 | static void ProfilerSignalHandler(int signal, siginfo_t* info, void* context) { |
| 722 | USE(info); |
| 723 | if (signal != SIGPROF) return; |
| 724 | Isolate* isolate = Isolate::UncheckedCurrent(); |
| 725 | if (isolate == NULL || !isolate->IsInitialized() || !isolate->IsInUse()) { |
| 726 | // We require a fully initialized and entered isolate. |
| 727 | return; |
| 728 | } |
| 729 | if (v8::Locker::IsActive() && |
| 730 | !isolate->thread_manager()->IsLockedByCurrentThread()) { |
| 731 | return; |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 732 | } |
| 733 | |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 734 | Sampler* sampler = isolate->logger()->sampler(); |
| 735 | if (sampler == NULL || !sampler->IsActive()) return; |
| 736 | |
| 737 | TickSample sample_obj; |
| 738 | TickSample* sample = CpuProfiler::TickSampleEvent(isolate); |
| 739 | if (sample == NULL) sample = &sample_obj; |
| 740 | |
| 741 | // Extracting the sample from the context is extremely machine dependent. |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 742 | sample->state = isolate->current_vm_state(); |
rossberg@chromium.org | fab1498 | 2012-01-05 15:02:15 +0000 | [diff] [blame] | 743 | ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(context); |
| 744 | #ifdef __NetBSD__ |
| 745 | mcontext_t& mcontext = ucontext->uc_mcontext; |
| 746 | #if V8_HOST_ARCH_IA32 |
| 747 | sample->pc = reinterpret_cast<Address>(mcontext.__gregs[_REG_EIP]); |
| 748 | sample->sp = reinterpret_cast<Address>(mcontext.__gregs[_REG_ESP]); |
| 749 | sample->fp = reinterpret_cast<Address>(mcontext.__gregs[_REG_EBP]); |
| 750 | #elif V8_HOST_ARCH_X64 |
| 751 | sample->pc = reinterpret_cast<Address>(mcontext.__gregs[_REG_RIP]); |
| 752 | sample->sp = reinterpret_cast<Address>(mcontext.__gregs[_REG_RSP]); |
| 753 | sample->fp = reinterpret_cast<Address>(mcontext.__gregs[_REG_RBP]); |
| 754 | #endif // V8_HOST_ARCH |
| 755 | #else // OpenBSD |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 756 | #if V8_HOST_ARCH_IA32 |
| 757 | sample->pc = reinterpret_cast<Address>(ucontext->sc_eip); |
| 758 | sample->sp = reinterpret_cast<Address>(ucontext->sc_esp); |
| 759 | sample->fp = reinterpret_cast<Address>(ucontext->sc_ebp); |
| 760 | #elif V8_HOST_ARCH_X64 |
| 761 | sample->pc = reinterpret_cast<Address>(ucontext->sc_rip); |
| 762 | sample->sp = reinterpret_cast<Address>(ucontext->sc_rsp); |
| 763 | sample->fp = reinterpret_cast<Address>(ucontext->sc_rbp); |
rossberg@chromium.org | fab1498 | 2012-01-05 15:02:15 +0000 | [diff] [blame] | 764 | #endif // V8_HOST_ARCH |
| 765 | #endif // __NetBSD__ |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 766 | sampler->SampleStack(sample); |
| 767 | sampler->Tick(sample); |
| 768 | } |
| 769 | |
| 770 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 771 | class Sampler::PlatformData : public Malloced { |
| 772 | public: |
| 773 | PlatformData() : vm_tid_(GetThreadID()) {} |
| 774 | |
| 775 | pthread_t vm_tid() const { return vm_tid_; } |
| 776 | |
| 777 | private: |
| 778 | pthread_t vm_tid_; |
| 779 | }; |
| 780 | |
| 781 | |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 782 | class SignalSender : public Thread { |
| 783 | public: |
| 784 | enum SleepInterval { |
| 785 | HALF_INTERVAL, |
| 786 | FULL_INTERVAL |
| 787 | }; |
| 788 | |
jkummerow@chromium.org | ab7dad4 | 2012-02-07 12:07:34 +0000 | [diff] [blame] | 789 | static const int kSignalSenderStackSize = 64 * KB; |
yangguo@chromium.org | 659ceec | 2012-01-26 07:37:54 +0000 | [diff] [blame] | 790 | |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 791 | explicit SignalSender(int interval) |
yangguo@chromium.org | 659ceec | 2012-01-26 07:37:54 +0000 | [diff] [blame] | 792 | : Thread(Thread::Options("SignalSender", kSignalSenderStackSize)), |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 793 | vm_tgid_(getpid()), |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 794 | interval_(interval) {} |
| 795 | |
erik.corry@gmail.com | ed49e96 | 2012-04-17 11:57:53 +0000 | [diff] [blame] | 796 | static void SetUp() { if (!mutex_) mutex_ = OS::CreateMutex(); } |
| 797 | static void TearDown() { delete mutex_; } |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 798 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 799 | static void InstallSignalHandler() { |
| 800 | struct sigaction sa; |
| 801 | sa.sa_sigaction = ProfilerSignalHandler; |
| 802 | sigemptyset(&sa.sa_mask); |
| 803 | sa.sa_flags = SA_RESTART | SA_SIGINFO; |
| 804 | signal_handler_installed_ = |
| 805 | (sigaction(SIGPROF, &sa, &old_signal_handler_) == 0); |
| 806 | } |
| 807 | |
| 808 | static void RestoreSignalHandler() { |
| 809 | if (signal_handler_installed_) { |
| 810 | sigaction(SIGPROF, &old_signal_handler_, 0); |
| 811 | signal_handler_installed_ = false; |
| 812 | } |
| 813 | } |
| 814 | |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 815 | static void AddActiveSampler(Sampler* sampler) { |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 816 | ScopedLock lock(mutex_); |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 817 | SamplerRegistry::AddActiveSampler(sampler); |
| 818 | if (instance_ == NULL) { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 819 | // Start a thread that will send SIGPROF signal to VM threads, |
| 820 | // when CPU profiling will be enabled. |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 821 | instance_ = new SignalSender(sampler->interval()); |
| 822 | instance_->Start(); |
| 823 | } else { |
| 824 | ASSERT(instance_->interval_ == sampler->interval()); |
| 825 | } |
| 826 | } |
| 827 | |
| 828 | static void RemoveActiveSampler(Sampler* sampler) { |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 829 | ScopedLock lock(mutex_); |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 830 | SamplerRegistry::RemoveActiveSampler(sampler); |
| 831 | if (SamplerRegistry::GetState() == SamplerRegistry::HAS_NO_SAMPLERS) { |
jkummerow@chromium.org | ddda9e8 | 2011-07-06 11:27:02 +0000 | [diff] [blame] | 832 | RuntimeProfiler::StopRuntimeProfilerThreadBeforeShutdown(instance_); |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 833 | delete instance_; |
| 834 | instance_ = NULL; |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 835 | RestoreSignalHandler(); |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 836 | } |
| 837 | } |
| 838 | |
| 839 | // Implement Thread::Run(). |
| 840 | virtual void Run() { |
| 841 | SamplerRegistry::State state; |
| 842 | while ((state = SamplerRegistry::GetState()) != |
| 843 | SamplerRegistry::HAS_NO_SAMPLERS) { |
| 844 | bool cpu_profiling_enabled = |
| 845 | (state == SamplerRegistry::HAS_CPU_PROFILING_SAMPLERS); |
| 846 | bool runtime_profiler_enabled = RuntimeProfiler::IsEnabled(); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 847 | if (cpu_profiling_enabled && !signal_handler_installed_) { |
| 848 | InstallSignalHandler(); |
| 849 | } else if (!cpu_profiling_enabled && signal_handler_installed_) { |
| 850 | RestoreSignalHandler(); |
| 851 | } |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 852 | // When CPU profiling is enabled both JavaScript and C++ code is |
| 853 | // profiled. We must not suspend. |
| 854 | if (!cpu_profiling_enabled) { |
| 855 | if (rate_limiter_.SuspendIfNecessary()) continue; |
| 856 | } |
| 857 | if (cpu_profiling_enabled && runtime_profiler_enabled) { |
| 858 | if (!SamplerRegistry::IterateActiveSamplers(&DoCpuProfile, this)) { |
| 859 | return; |
| 860 | } |
| 861 | Sleep(HALF_INTERVAL); |
| 862 | if (!SamplerRegistry::IterateActiveSamplers(&DoRuntimeProfile, NULL)) { |
| 863 | return; |
| 864 | } |
| 865 | Sleep(HALF_INTERVAL); |
| 866 | } else { |
| 867 | if (cpu_profiling_enabled) { |
| 868 | if (!SamplerRegistry::IterateActiveSamplers(&DoCpuProfile, |
| 869 | this)) { |
| 870 | return; |
| 871 | } |
| 872 | } |
| 873 | if (runtime_profiler_enabled) { |
| 874 | if (!SamplerRegistry::IterateActiveSamplers(&DoRuntimeProfile, |
| 875 | NULL)) { |
| 876 | return; |
| 877 | } |
| 878 | } |
| 879 | Sleep(FULL_INTERVAL); |
| 880 | } |
| 881 | } |
| 882 | } |
| 883 | |
| 884 | static void DoCpuProfile(Sampler* sampler, void* raw_sender) { |
| 885 | if (!sampler->IsProfiling()) return; |
| 886 | SignalSender* sender = reinterpret_cast<SignalSender*>(raw_sender); |
| 887 | sender->SendProfilingSignal(sampler->platform_data()->vm_tid()); |
| 888 | } |
| 889 | |
| 890 | static void DoRuntimeProfile(Sampler* sampler, void* ignored) { |
| 891 | if (!sampler->isolate()->IsInitialized()) return; |
| 892 | sampler->isolate()->runtime_profiler()->NotifyTick(); |
| 893 | } |
| 894 | |
| 895 | void SendProfilingSignal(pthread_t tid) { |
| 896 | if (!signal_handler_installed_) return; |
| 897 | pthread_kill(tid, SIGPROF); |
| 898 | } |
| 899 | |
| 900 | void Sleep(SleepInterval full_or_half) { |
| 901 | // Convert ms to us and subtract 100 us to compensate delays |
| 902 | // occuring during signal delivery. |
| 903 | useconds_t interval = interval_ * 1000 - 100; |
| 904 | if (full_or_half == HALF_INTERVAL) interval /= 2; |
| 905 | int result = usleep(interval); |
| 906 | #ifdef DEBUG |
| 907 | if (result != 0 && errno != EINTR) { |
| 908 | fprintf(stderr, |
| 909 | "SignalSender usleep error; interval = %u, errno = %d\n", |
| 910 | interval, |
| 911 | errno); |
| 912 | ASSERT(result == 0 || errno == EINTR); |
| 913 | } |
| 914 | #endif |
| 915 | USE(result); |
| 916 | } |
| 917 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 918 | const int vm_tgid_; |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 919 | const int interval_; |
| 920 | RuntimeProfilerRateLimiter rate_limiter_; |
| 921 | |
| 922 | // Protects the process wide state below. |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 923 | static Mutex* mutex_; |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 924 | static SignalSender* instance_; |
| 925 | static bool signal_handler_installed_; |
| 926 | static struct sigaction old_signal_handler_; |
| 927 | |
jkummerow@chromium.org | 05ed9dd | 2012-01-23 14:42:48 +0000 | [diff] [blame] | 928 | private: |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 929 | DISALLOW_COPY_AND_ASSIGN(SignalSender); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 930 | }; |
| 931 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 932 | |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 933 | Mutex* SignalSender::mutex_ = NULL; |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 934 | SignalSender* SignalSender::instance_ = NULL; |
| 935 | struct sigaction SignalSender::old_signal_handler_; |
| 936 | bool SignalSender::signal_handler_installed_ = false; |
| 937 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 938 | |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 939 | void OS::SetUp() { |
| 940 | // Seed the random number generator. We preserve microsecond resolution. |
| 941 | uint64_t seed = Ticks() ^ (getpid() << 16); |
| 942 | srandom(static_cast<unsigned int>(seed)); |
| 943 | limit_mutex = CreateMutex(); |
| 944 | SignalSender::SetUp(); |
| 945 | } |
| 946 | |
| 947 | |
erik.corry@gmail.com | ed49e96 | 2012-04-17 11:57:53 +0000 | [diff] [blame] | 948 | void OS::TearDown() { |
| 949 | SignalSender::TearDown(); |
| 950 | delete limit_mutex; |
| 951 | } |
| 952 | |
| 953 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 954 | Sampler::Sampler(Isolate* isolate, int interval) |
| 955 | : isolate_(isolate), |
| 956 | interval_(interval), |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 957 | profiling_(false), |
ager@chromium.org | beb2571 | 2010-11-29 08:02:25 +0000 | [diff] [blame] | 958 | active_(false), |
| 959 | samples_taken_(0) { |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 960 | data_ = new PlatformData; |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 961 | } |
| 962 | |
| 963 | |
| 964 | Sampler::~Sampler() { |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 965 | ASSERT(!IsActive()); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 966 | delete data_; |
| 967 | } |
| 968 | |
| 969 | |
| 970 | void Sampler::Start() { |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 971 | ASSERT(!IsActive()); |
| 972 | SetActive(true); |
| 973 | SignalSender::AddActiveSampler(this); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 974 | } |
| 975 | |
| 976 | |
| 977 | void Sampler::Stop() { |
erik.corry@gmail.com | d6076d9 | 2011-06-06 09:39:18 +0000 | [diff] [blame] | 978 | ASSERT(IsActive()); |
| 979 | SignalSender::RemoveActiveSampler(this); |
| 980 | SetActive(false); |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 981 | } |
| 982 | |
sgjesse@chromium.org | ac6aa17 | 2009-12-04 12:29:05 +0000 | [diff] [blame] | 983 | |
| 984 | } } // namespace v8::internal |