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| 1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
| 2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
| 3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
| 4 // met: | 4 // met: |
| 5 // | 5 // |
| 6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
| 7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
| 8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
| 9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
| 10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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| 136 | 136 |
| 137 double ceiling(double x) { | 137 double ceiling(double x) { |
| 138 return ceil(x); | 138 return ceil(x); |
| 139 } | 139 } |
| 140 | 140 |
| 141 | 141 |
| 142 static Mutex* limit_mutex = NULL; | 142 static Mutex* limit_mutex = NULL; |
| 143 | 143 |
| 144 #if defined(V8_TARGET_ARCH_IA32) | 144 #if defined(V8_TARGET_ARCH_IA32) |
| 145 static OS::MemCopyFunction memcopy_function = NULL; | 145 static OS::MemCopyFunction memcopy_function = NULL; |
| 146 static Mutex* memcopy_function_mutex = OS::CreateMutex(); | 146 static LazyMutex memcopy_function_mutex = LAZY_MUTEX_INITIALIZER; |
| 147 // Defined in codegen-ia32.cc. | 147 // Defined in codegen-ia32.cc. |
| 148 OS::MemCopyFunction CreateMemCopyFunction(); | 148 OS::MemCopyFunction CreateMemCopyFunction(); |
| 149 | 149 |
| 150 // Copy memory area to disjoint memory area. | 150 // Copy memory area to disjoint memory area. |
| 151 void OS::MemCopy(void* dest, const void* src, size_t size) { | 151 void OS::MemCopy(void* dest, const void* src, size_t size) { |
| 152 if (memcopy_function == NULL) { | 152 if (memcopy_function == NULL) { |
| 153 ScopedLock lock(memcopy_function_mutex); | 153 ScopedLock lock(memcopy_function_mutex.Pointer()); |
| 154 if (memcopy_function == NULL) { | 154 if (memcopy_function == NULL) { |
| 155 OS::MemCopyFunction temp = CreateMemCopyFunction(); | 155 OS::MemCopyFunction temp = CreateMemCopyFunction(); |
| 156 MemoryBarrier(); | 156 MemoryBarrier(); |
| 157 memcopy_function = temp; | 157 memcopy_function = temp; |
| 158 } | 158 } |
| 159 } | 159 } |
| 160 // Note: here we rely on dependent reads being ordered. This is true | 160 // Note: here we rely on dependent reads being ordered. This is true |
| 161 // on all architectures we currently support. | 161 // on all architectures we currently support. |
| 162 (*memcopy_function)(dest, src, size); | 162 (*memcopy_function)(dest, src, size); |
| 163 #ifdef DEBUG | 163 #ifdef DEBUG |
| 164 CHECK_EQ(0, memcmp(dest, src, size)); | 164 CHECK_EQ(0, memcmp(dest, src, size)); |
| 165 #endif | 165 #endif |
| 166 } | 166 } |
| 167 #endif // V8_TARGET_ARCH_IA32 | 167 #endif // V8_TARGET_ARCH_IA32 |
| 168 | 168 |
| 169 #ifdef _WIN64 | 169 #ifdef _WIN64 |
| 170 typedef double (*ModuloFunction)(double, double); | 170 typedef double (*ModuloFunction)(double, double); |
| 171 static ModuloFunction modulo_function = NULL; | 171 static ModuloFunction modulo_function = NULL; |
| 172 static Mutex* modulo_function_mutex = OS::CreateMutex(); | 172 static LazyMutex modulo_function_mutex = LAZY_MUTEX_INITIALIZER; |
| 173 // Defined in codegen-x64.cc. | 173 // Defined in codegen-x64.cc. |
| 174 ModuloFunction CreateModuloFunction(); | 174 ModuloFunction CreateModuloFunction(); |
| 175 | 175 |
| 176 double modulo(double x, double y) { | 176 double modulo(double x, double y) { |
| 177 if (modulo_function == NULL) { | 177 if (modulo_function == NULL) { |
| 178 ScopedLock lock(modulo_function_mutex); | 178 ScopedLock lock(modulo_function_mutex.Pointer()); |
| 179 if (modulo_function == NULL) { | 179 if (modulo_function == NULL) { |
| 180 ModuloFunction temp = CreateModuloFunction(); | 180 ModuloFunction temp = CreateModuloFunction(); |
| 181 MemoryBarrier(); | 181 MemoryBarrier(); |
| 182 modulo_function = temp; | 182 modulo_function = temp; |
| 183 } | 183 } |
| 184 } | 184 } |
| 185 // Note: here we rely on dependent reads being ordered. This is true | 185 // Note: here we rely on dependent reads being ordered. This is true |
| 186 // on all architectures we currently support. | 186 // on all architectures we currently support. |
| 187 return (*modulo_function)(x, y); | 187 return (*modulo_function)(x, y); |
| 188 } | 188 } |
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| 2026 sampler->SampleStack(sample); | 2026 sampler->SampleStack(sample); |
| 2027 sampler->Tick(sample); | 2027 sampler->Tick(sample); |
| 2028 } | 2028 } |
| 2029 ResumeThread(profiled_thread); | 2029 ResumeThread(profiled_thread); |
| 2030 } | 2030 } |
| 2031 | 2031 |
| 2032 const int interval_; | 2032 const int interval_; |
| 2033 RuntimeProfilerRateLimiter rate_limiter_; | 2033 RuntimeProfilerRateLimiter rate_limiter_; |
| 2034 | 2034 |
| 2035 // Protects the process wide state below. | 2035 // Protects the process wide state below. |
| 2036 static Mutex* mutex_; | 2036 static LazyMutex mutex_; |
| 2037 static SamplerThread* instance_; | 2037 static SamplerThread* instance_; |
| 2038 | 2038 |
| 2039 private: | 2039 private: |
| 2040 DISALLOW_COPY_AND_ASSIGN(SamplerThread); | 2040 DISALLOW_COPY_AND_ASSIGN(SamplerThread); |
| 2041 }; | 2041 }; |
| 2042 | 2042 |
| 2043 | 2043 |
| 2044 Mutex* SamplerThread::mutex_ = OS::CreateMutex(); | 2044 LazyMutex SamplerThread::mutex_ = LAZY_MUTEX_INITIALIZER; |
| 2045 SamplerThread* SamplerThread::instance_ = NULL; | 2045 SamplerThread* SamplerThread::instance_ = NULL; |
| 2046 | 2046 |
| 2047 | 2047 |
| 2048 Sampler::Sampler(Isolate* isolate, int interval) | 2048 Sampler::Sampler(Isolate* isolate, int interval) |
| 2049 : isolate_(isolate), | 2049 : isolate_(isolate), |
| 2050 interval_(interval), | 2050 interval_(interval), |
| 2051 profiling_(false), | 2051 profiling_(false), |
| 2052 active_(false), | 2052 active_(false), |
| 2053 samples_taken_(0) { | 2053 samples_taken_(0) { |
| 2054 data_ = new PlatformData; | 2054 data_ = new PlatformData; |
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| 2069 | 2069 |
| 2070 | 2070 |
| 2071 void Sampler::Stop() { | 2071 void Sampler::Stop() { |
| 2072 ASSERT(IsActive()); | 2072 ASSERT(IsActive()); |
| 2073 SamplerThread::RemoveActiveSampler(this); | 2073 SamplerThread::RemoveActiveSampler(this); |
| 2074 SetActive(false); | 2074 SetActive(false); |
| 2075 } | 2075 } |
| 2076 | 2076 |
| 2077 | 2077 |
| 2078 } } // namespace v8::internal | 2078 } } // namespace v8::internal |
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