Optimize functions on a second thread.

src/optimizing-compiler-thread.cc

+// Copyright 2012 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "optimizing-compiler-thread.h"
+
+#include "v8.h"
+
+#include "hydrogen.h"
+#include "isolate.h"
+#include "v8threads.h"
+
+namespace v8 {
+namespace internal {
+
+
+void OptimizingCompilerThread::Run() {
+#ifdef DEBUG
+  thread_id_ = ThreadId::Current().ToInteger();
+#endif
+  Isolate::SetIsolateThreadLocals(isolate_, NULL);
+
+  while (true) {
+    input_queue_semaphore_->Wait();
+    if (Acquire_Load(&stop_thread_)) {
+      stop_semaphore_->Signal();
+      return;
+    }
+
+    Heap::RelocationLock relocation_lock(isolate_->heap());
+    OptimizingCompiler* optimizing_compiler = NULL;
+    input_queue_.Dequeue(&optimizing_compiler);
+    Barrier_AtomicIncrement(&queue_length_, static_cast<Atomic32>(-1));
+
+    ASSERT(!optimizing_compiler->info()->closure()->IsOptimized());
+
+    OptimizingCompiler::Status status = optimizing_compiler->OptimizeGraph();
+    ASSERT(status != OptimizingCompiler::FAILED);
+    (void) status;
+
+    output_queue_.Enqueue(optimizing_compiler);
+    isolate_->stack_guard()->RequestCodeReadyEvent();
+  }
+}
+
+
+void OptimizingCompilerThread::Stop() {
+  Release_Store(&stop_thread_, static_cast<AtomicWord>(true));
+  input_queue_semaphore_->Signal();
+  stop_semaphore_->Wait();
+}
+
+
+void OptimizingCompilerThread::InstallOptimizedFunctions() {
+  HandleScope handle_scope(isolate_);
+  int functions_installed = 0;
+  while (!output_queue_.IsEmpty()) {
+    OptimizingCompiler* compiler = NULL;

[Yang, 2012/07/19 12:47:30]

Maybe OptimizingCompileTask would be a better name than OptimizingCompiler.

[sanjoy, 2012/07/19 15:06:09]

I'm not sure about this -- MakeCrankshaftCode uses OptimizingCompiler just like
a compiler, for instance.  It really does have all the state and the code needed
to fully optimize a function.

+    output_queue_.Dequeue(&compiler);
+    Compiler::InstallOptimizedCode(compiler);
+    functions_installed++;
+  }
+  if (FLAG_trace_parallel_recompilation && functions_installed != 0) {
+    PrintF("  ** Installed %d function(s).\n", functions_installed);
+  }
+}
+
+
+void OptimizingCompilerThread::QueueForOptimization(
+    OptimizingCompiler* optimizing_compiler) {
+  input_queue_.Enqueue(optimizing_compiler);
+  input_queue_semaphore_->Signal();
+}
+
+#ifdef DEBUG
+bool OptimizingCompilerThread::IsOptimizerThread() {
+  return ThreadId::Current().ToInteger() == thread_id_;
+}
+#endif
+
+
+} }  // namespace v8::internal