Merge up to 8597 to experimental/gc from the bleeding edge.

src/platform.h

 // Copyright 2011 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
@@ skipping 270 matching lines @@
   static void SignalCodeMovingGC();
 
   // The return value indicates the CPU features we are sure of because of the
   // OS.  For example MacOSX doesn't run on any x86 CPUs that don't have SSE2
   // instructions.
   // This is a little messy because the interpretation is subject to the cross
   // of the CPU and the OS.  The bits in the answer correspond to the bit
   // positions indicated by the members of the CpuFeature enum from globals.h
   static uint64_t CpuFeaturesImpliedByPlatform();
 
+  // Maximum size of the virtual memory.  0 means there is no artificial
+  // limit.
+  static intptr_t MaxVirtualMemory();
+
   // Returns the double constant NAN
   static double nan_value();
 
   // Support runtime detection of VFP3 on ARM CPUs.
   static bool ArmCpuHasFeature(CpuFeature feature);
 
   // Support runtime detection of whether the hard float option of the
   // EABI is used.
   static bool ArmUsingHardFloat();
 
@@ skipping 85 matching lines @@
     LOCAL_STORAGE_KEY_MAX_VALUE = kMaxInt
   };
 
   struct Options {
     Options() : name("v8:<unknown>"), stack_size(0) {}
 
     const char* name;
     int stack_size;
   };
 
-  // Create new thread (with a value for storing in the TLS isolate field).
-  Thread(Isolate* isolate, const Options& options);
-  Thread(Isolate* isolate, const char* name);
+  // Create new thread.
+  explicit Thread(const Options& options);
+  explicit Thread(const char* name);
   virtual ~Thread();
 
   // Start new thread by calling the Run() method in the new thread.
   void Start();
 
   // Wait until thread terminates.
   void Join();
 
   inline const char* name() const {
     return name_;
@@ skipping 26 matching lines @@
   }
 #else
   static inline void* GetExistingThreadLocal(LocalStorageKey key) {
     return GetThreadLocal(key);
   }
 #endif
 
   // A hint to the scheduler to let another thread run.
   static void YieldCPU();
 
-  Isolate* isolate() const { return isolate_; }
 
   // The thread name length is limited to 16 based on Linux's implementation of
   // prctl().
   static const int kMaxThreadNameLength = 16;
 
   class PlatformData;
   PlatformData* data() { return data_; }
 
  private:
   void set_name(const char *name);
 
   PlatformData* data_;
 
-  Isolate* isolate_;
   char name_[kMaxThreadNameLength];
   int stack_size_;
 
   DISALLOW_COPY_AND_ASSIGN(Thread);
 };
 
 
 // ----------------------------------------------------------------------------
 // Mutex
 //
@@ skipping 197 matching lines @@
   int samples_taken_;  // Counts stack samples taken.
   DISALLOW_IMPLICIT_CONSTRUCTORS(Sampler);
 };
 
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_H_