1// Copyright 2012 the V8 project authors. All rights reserved. 2// Redistribution and use in source and binary forms, with or without 3// modification, are permitted provided that the following conditions are 4// met: 5// 6// * Redistributions of source code must retain the above copyright 7// notice, this list of conditions and the following disclaimer. 8// * Redistributions in binary form must reproduce the above 9// copyright notice, this list of conditions and the following 10// disclaimer in the documentation and/or other materials provided 11// with the distribution. 12// * Neither the name of Google Inc. nor the names of its 13// contributors may be used to endorse or promote products derived 14// from this software without specific prior written permission. 15// 16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28#ifndef V8_OPTIMIZING_COMPILER_THREAD_H_ 29#define V8_OPTIMIZING_COMPILER_THREAD_H_ 30 31#include "atomicops.h" 32#include "flags.h" 33#include "platform.h" 34#include "unbound-queue-inl.h" 35 36namespace v8 { 37namespace internal { 38 39class HOptimizedGraphBuilder; 40class OptimizingCompiler; 41class SharedFunctionInfo; 42 43class OptimizingCompilerThread : public Thread { 44 public: 45 explicit OptimizingCompilerThread(Isolate *isolate) : 46 Thread("OptimizingCompilerThread"), 47#ifdef DEBUG 48 thread_id_(0), 49 thread_id_mutex_(OS::CreateMutex()), 50#endif 51 isolate_(isolate), 52 stop_semaphore_(OS::CreateSemaphore(0)), 53 input_queue_semaphore_(OS::CreateSemaphore(0)), 54 install_mutex_(OS::CreateMutex()), 55 time_spent_compiling_(0), 56 time_spent_total_(0) { 57 NoBarrier_Store(&stop_thread_, static_cast<AtomicWord>(CONTINUE)); 58 NoBarrier_Store(&queue_length_, static_cast<AtomicWord>(0)); 59 } 60 61 void Run(); 62 void Stop(); 63 void Flush(); 64 void QueueForOptimization(OptimizingCompiler* optimizing_compiler); 65 void InstallOptimizedFunctions(); 66 67 inline bool IsQueueAvailable() { 68 // We don't need a barrier since we have a data dependency right 69 // after. 70 Atomic32 current_length = NoBarrier_Load(&queue_length_); 71 72 // This can be queried only from the execution thread. 73 ASSERT(!IsOptimizerThread()); 74 // Since only the execution thread increments queue_length_ and 75 // only one thread can run inside an Isolate at one time, a direct 76 // doesn't introduce a race -- queue_length_ may decreased in 77 // meantime, but not increased. 78 return (current_length < FLAG_parallel_recompilation_queue_length); 79 } 80 81#ifdef DEBUG 82 bool IsOptimizerThread(); 83#endif 84 85 ~OptimizingCompilerThread() { 86 delete install_mutex_; 87 delete input_queue_semaphore_; 88 delete stop_semaphore_; 89#ifdef DEBUG 90 delete thread_id_mutex_; 91#endif 92 } 93 94 private: 95 enum StopFlag { CONTINUE, STOP, FLUSH }; 96 97 void FlushInputQueue(bool restore_function_code); 98 void FlushOutputQueue(bool restore_function_code); 99 100 void CompileNext(); 101 102#ifdef DEBUG 103 int thread_id_; 104 Mutex* thread_id_mutex_; 105#endif 106 107 Isolate* isolate_; 108 Semaphore* stop_semaphore_; 109 Semaphore* input_queue_semaphore_; 110 UnboundQueue<OptimizingCompiler*> input_queue_; 111 UnboundQueue<OptimizingCompiler*> output_queue_; 112 Mutex* install_mutex_; 113 volatile AtomicWord stop_thread_; 114 volatile Atomic32 queue_length_; 115 int64_t time_spent_compiling_; 116 int64_t time_spent_total_; 117}; 118 119} } // namespace v8::internal 120 121#endif // V8_OPTIMIZING_COMPILER_THREAD_H_ 122