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
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.
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
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21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #include "optimizing-compiler-thread.h"
34 #include "v8threads.h"
40 void OptimizingCompilerThread::Run() {
42 thread_id_ = ThreadId::Current().ToInteger();
44 Isolate::SetIsolateThreadLocals(isolate_, NULL);
47 if (FLAG_trace_parallel_recompilation) epoch = OS::Ticks();
50 input_queue_semaphore_->Wait();
51 if (Acquire_Load(&stop_thread_)) {
52 stop_semaphore_->Signal();
53 if (FLAG_trace_parallel_recompilation) {
54 time_spent_total_ = OS::Ticks() - epoch;
59 int64_t compiling_start = 0;
60 if (FLAG_trace_parallel_recompilation) compiling_start = OS::Ticks();
62 Heap::RelocationLock relocation_lock(isolate_->heap());
63 OptimizingCompiler* optimizing_compiler = NULL;
64 input_queue_.Dequeue(&optimizing_compiler);
65 Barrier_AtomicIncrement(&queue_length_, static_cast<Atomic32>(-1));
67 ASSERT(!optimizing_compiler->info()->closure()->IsOptimized());
69 OptimizingCompiler::Status status = optimizing_compiler->OptimizeGraph();
70 ASSERT(status != OptimizingCompiler::FAILED);
71 // Prevent an unused-variable error in release mode.
74 output_queue_.Enqueue(optimizing_compiler);
75 isolate_->stack_guard()->RequestCodeReadyEvent();
77 if (FLAG_trace_parallel_recompilation) {
78 time_spent_compiling_ += OS::Ticks() - compiling_start;
84 void OptimizingCompilerThread::Stop() {
85 Release_Store(&stop_thread_, static_cast<AtomicWord>(true));
86 input_queue_semaphore_->Signal();
87 stop_semaphore_->Wait();
89 if (FLAG_trace_parallel_recompilation) {
90 double compile_time = static_cast<double>(time_spent_compiling_);
91 double total_time = static_cast<double>(time_spent_total_);
92 double percentage = (compile_time * 100) / total_time;
93 PrintF(" ** Compiler thread did %.2f%% useful work\n", percentage);
98 void OptimizingCompilerThread::InstallOptimizedFunctions() {
99 HandleScope handle_scope(isolate_);
100 int functions_installed = 0;
101 while (!output_queue_.IsEmpty()) {
102 OptimizingCompiler* compiler = NULL;
103 output_queue_.Dequeue(&compiler);
104 Compiler::InstallOptimizedCode(compiler);
105 functions_installed++;
107 if (FLAG_trace_parallel_recompilation && functions_installed != 0) {
108 PrintF(" ** Installed %d function(s).\n", functions_installed);
113 void OptimizingCompilerThread::QueueForOptimization(
114 OptimizingCompiler* optimizing_compiler) {
115 input_queue_.Enqueue(optimizing_compiler);
116 input_queue_semaphore_->Signal();
120 bool OptimizingCompilerThread::IsOptimizerThread() {
121 if (!FLAG_parallel_recompilation) return false;
122 return ThreadId::Current().ToInteger() == thread_id_;
127 } } // namespace v8::internal