[compiler] Remove support for concurrent OSR.

src/optimizing-compile-dispatcher.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OPTIMIZING_COMPILE_DISPATCHER_H_
 #define V8_OPTIMIZING_COMPILE_DISPATCHER_H_
 
 #include <queue>
 
 #include "src/base/atomicops.h"
@@ skipping 10 matching lines @@
 class OptimizedCompileJob;
 class SharedFunctionInfo;
 
 class OptimizingCompileDispatcher {
  public:
   explicit OptimizingCompileDispatcher(Isolate* isolate)
       : isolate_(isolate),
         input_queue_capacity_(FLAG_concurrent_recompilation_queue_length),
         input_queue_length_(0),
         input_queue_shift_(0),
-        osr_buffer_capacity_(FLAG_concurrent_recompilation_queue_length + 4),
-        osr_buffer_cursor_(0),
-        osr_hits_(0),
-        osr_attempts_(0),
         blocked_jobs_(0),
         ref_count_(0),
         recompilation_delay_(FLAG_concurrent_recompilation_delay) {
     base::NoBarrier_Store(&mode_, static_cast<base::AtomicWord>(COMPILE));
     input_queue_ = NewArray<OptimizedCompileJob*>(input_queue_capacity_);
-    if (FLAG_concurrent_osr) {
-      // Allocate and mark OSR buffer slots as empty.
-      osr_buffer_ = NewArray<OptimizedCompileJob*>(osr_buffer_capacity_);
-      for (int i = 0; i < osr_buffer_capacity_; i++) osr_buffer_[i] = NULL;
-    }
   }
 
   ~OptimizingCompileDispatcher();
 
   void Run();
   void Stop();
   void Flush();
   void QueueForOptimization(OptimizedCompileJob* optimizing_compiler);
   void Unblock();
   void InstallOptimizedFunctions();
-  OptimizedCompileJob* FindReadyOSRCandidate(Handle<JSFunction> function,
-                                             BailoutId osr_ast_id);
-  bool IsQueuedForOSR(Handle<JSFunction> function, BailoutId osr_ast_id);
-
-  bool IsQueuedForOSR(JSFunction* function);
 
   inline bool IsQueueAvailable() {
     base::LockGuard<base::Mutex> access_input_queue(&input_queue_mutex_);
     return input_queue_length_ < input_queue_capacity_;
   }
 
-  inline void AgeBufferedOsrJobs() {
-    // Advance cursor of the cyclic buffer to next empty slot or stale OSR job.
-    // Dispose said OSR job in the latter case.  Calling this on every GC
-    // should make sure that we do not hold onto stale jobs indefinitely.
-    AddToOsrBuffer(NULL);
-  }
-
   static bool Enabled() { return FLAG_concurrent_recompilation; }
 
  private:
   class CompileTask;
 
   enum ModeFlag { COMPILE, FLUSH };
 
   void FlushOutputQueue(bool restore_function_code);
-  void FlushOsrBuffer(bool restore_function_code);
   void CompileNext(OptimizedCompileJob* job);
   OptimizedCompileJob* NextInput(bool check_if_flushing = false);
 
-  // Add a recompilation task for OSR to the cyclic buffer, awaiting OSR entry.
-  // Tasks evicted from the cyclic buffer are discarded.
-  void AddToOsrBuffer(OptimizedCompileJob* compiler);
-
   inline int InputQueueIndex(int i) {
     int result = (i + input_queue_shift_) % input_queue_capacity_;
     DCHECK_LE(0, result);
     DCHECK_LT(result, input_queue_capacity_);
     return result;
   }
 
   Isolate* isolate_;
 
   // Circular queue of incoming recompilation tasks (including OSR).
   OptimizedCompileJob** input_queue_;
   int input_queue_capacity_;
   int input_queue_length_;
   int input_queue_shift_;
   base::Mutex input_queue_mutex_;
 
   // Queue of recompilation tasks ready to be installed (excluding OSR).
   std::queue<OptimizedCompileJob*> output_queue_;
   // Used for job based recompilation which has multiple producers on
   // different threads.
   base::Mutex output_queue_mutex_;
 
-  // Cyclic buffer of recompilation tasks for OSR.
-  OptimizedCompileJob** osr_buffer_;
-  int osr_buffer_capacity_;
-  int osr_buffer_cursor_;
-
   volatile base::AtomicWord mode_;
 
-  int osr_hits_;
-  int osr_attempts_;
-
   int blocked_jobs_;
 
   int ref_count_;
   base::Mutex ref_count_mutex_;
   base::ConditionVariable ref_count_zero_;
 
   // Copy of FLAG_concurrent_recompilation_delay that will be used from the
   // background thread.
   //
   // Since flags might get modified while the background thread is running, it
   // is not safe to access them directly.
   int recompilation_delay_;
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OPTIMIZING_COMPILE_DISPATCHER_H_