Add support for enabling DCHECKs in release mode

src/optimizing-compiler-thread.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_COMPILER_THREAD_H_
 #define V8_OPTIMIZING_COMPILER_THREAD_H_
 
 #include "src/base/atomicops.h"
 #include "src/base/platform/mutex.h"
 #include "src/base/platform/platform.h"
 #include "src/base/platform/time.h"
 #include "src/flags.h"
 #include "src/list.h"
 #include "src/unbound-queue-inl.h"
 
 namespace v8 {
 namespace internal {
 
 class HOptimizedGraphBuilder;
 class OptimizedCompileJob;
 class SharedFunctionInfo;
 
 class OptimizingCompilerThread : public base::Thread {
  public:
   explicit OptimizingCompilerThread(Isolate* isolate)
       : Thread(Options("OptimizingCompilerThread")),
-#ifdef DEBUG
+#if DCHECK_IS_ON
         thread_id_(0),
 #endif
         isolate_(isolate),
         stop_semaphore_(0),
         input_queue_semaphore_(0),
         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),
@@ skipping 35 matching lines @@
     // 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(int max_available) {
     return (FLAG_concurrent_recompilation && max_available > 1);
   }
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   static bool IsOptimizerThread(Isolate* isolate);
   bool IsOptimizerThread();
 #endif
 
  private:
   class CompileTask;
 
   enum StopFlag { CONTINUE, STOP, FLUSH };
 
   void FlushInputQueue(bool restore_function_code);
   void FlushOutputQueue(bool restore_function_code);
   void FlushOsrBuffer(bool restore_function_code);
   void CompileNext();
   OptimizedCompileJob* NextInput();
 
   // 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;
   }
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   int thread_id_;
   base::Mutex thread_id_mutex_;
 #endif
 
   Isolate* isolate_;
   base::Semaphore stop_semaphore_;
   base::Semaphore input_queue_semaphore_;
 
   // Circular queue of incoming recompilation tasks (including OSR).
   OptimizedCompileJob** input_queue_;
@@ skipping 27 matching lines @@
   //
   // Since flags might get modified while the background thread is running, it
   // is not safe to access them directly.
   bool tracing_enabled_;
   bool job_based_recompilation_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OPTIMIZING_COMPILER_THREAD_H_