Merge V8 at 3.9.24.13

Bug: 5688872
Change-Id: Id0aa8d23375030494d3189c31774059c0f5398fc

4 files changed, 157 insertions, 30 deletions

diff --git a/include/v8-debug.h b/include/v8-debug.h
index 504cbfed..9e85dc46 100644..100755
--- a/include/v8-debug.h
+++ b/include/v8-debug.h
@@ -340,6 +340,11 @@ class EXPORT Debug {
                           bool wait_for_connection = false);
 
   /**
+    * Disable the V8 builtin debug agent. The TCP/IP connection will be closed.
+    */
+  static void DisableAgent();
+
+  /**
    * Makes V8 process all pending debug messages.
    *
    * From V8 point of view all debug messages come asynchronously (e.g. from
diff --git a/include/v8-profiler.h b/include/v8-profiler.h
index f67646f5..2499bbf0 100644
--- a/include/v8-profiler.h
+++ b/include/v8-profiler.h
@@ -219,8 +219,9 @@ class V8EXPORT HeapGraphEdge {
                            // (e.g. parts of a ConsString).
     kHidden = 4,           // A link that is needed for proper sizes
                            // calculation, but may be hidden from user.
-    kShortcut = 5          // A link that must not be followed during
+    kShortcut = 5,         // A link that must not be followed during
                            // sizes calculation.
+    kWeak = 6              // A weak reference (ignored by the GC).
   };
 
   /** Returns edge type (see HeapGraphEdge::Type). */
@@ -254,7 +255,9 @@ class V8EXPORT HeapGraphNode {
     kClosure = 5,     // Function closure.
     kRegExp = 6,      // RegExp.
     kHeapNumber = 7,  // Number stored in the heap.
-    kNative = 8       // Native object (not from V8 heap).
+    kNative = 8,      // Native object (not from V8 heap).
+    kSynthetic = 9    // Synthetic object, usualy used for grouping
+                      // snapshot items together.
   };
 
   /** Returns node type (see HeapGraphNode::Type). */
@@ -281,14 +284,8 @@ class V8EXPORT HeapGraphNode {
    * the objects that are reachable only from this object. In other
    * words, the size of memory that will be reclaimed having this node
    * collected.
-   *
-   * Exact retained size calculation has O(N) (number of nodes)
-   * computational complexity, while approximate has O(1). It is
-   * assumed that initially heap profiling tools provide approximate
-   * sizes for all nodes, and then exact sizes are calculated for the
-   * most 'interesting' nodes.
    */
-  int GetRetainedSize(bool exact) const;
+  int GetRetainedSize() const;
 
   /** Returns child nodes count of the node. */
   int GetChildrenCount() const;
@@ -433,6 +430,9 @@ class V8EXPORT HeapProfiler {
    * handle.
    */
   static const uint16_t kPersistentHandleNoClassId = 0;
+
+  /** Returns the number of currently existing persistent handles. */
+  static int GetPersistentHandleCount();
 };
 
 
@@ -475,12 +475,23 @@ class V8EXPORT RetainedObjectInfo {  // NOLINT
   virtual intptr_t GetHash() = 0;
 
   /**
-   * Returns human-readable label. It must be a NUL-terminated UTF-8
+   * Returns human-readable label. It must be a null-terminated UTF-8
    * encoded string. V8 copies its contents during a call to GetLabel.
    */
   virtual const char* GetLabel() = 0;
 
   /**
+   * Returns human-readable group label. It must be a null-terminated UTF-8
+   * encoded string. V8 copies its contents during a call to GetGroupLabel.
+   * Heap snapshot generator will collect all the group names, create
+   * top level entries with these names and attach the objects to the
+   * corresponding top level group objects. There is a default
+   * implementation which is required because embedders don't have their
+   * own implementation yet.
+   */
+  virtual const char* GetGroupLabel() { return GetLabel(); }
+
+  /**
    * Returns element count in case if a global handle retains
    * a subgraph by holding one of its nodes.
    */
diff --git a/include/v8.h b/include/v8.h
index 4b7f6e73..33179f5b 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -1021,6 +1021,14 @@ class String : public Primitive {
   V8EXPORT int Utf8Length() const;
 
   /**
+   * A fast conservative check for non-ASCII characters.  May
+   * return true even for ASCII strings, but if it returns
+   * false you can be sure that all characters are in the range
+   * 0-127.
+   */
+  V8EXPORT bool MayContainNonAscii() const;
+
+  /**
    * Write the contents of the string to an external buffer.
    * If no arguments are given, expects the buffer to be large
    * enough to hold the entire string and NULL terminator. Copies
@@ -1171,7 +1179,8 @@ class String : public Primitive {
    * Get the ExternalAsciiStringResource for an external ASCII string.
    * Returns NULL if IsExternalAscii() doesn't return true.
    */
-  V8EXPORT ExternalAsciiStringResource* GetExternalAsciiStringResource() const;
+  V8EXPORT const ExternalAsciiStringResource* GetExternalAsciiStringResource()
+      const;
 
   static inline String* Cast(v8::Value* obj);
 
@@ -1197,7 +1206,7 @@ class String : public Primitive {
    * passed in as parameters.
    */
   V8EXPORT static Local<String> Concat(Handle<String> left,
-                                       Handle<String>right);
+                                       Handle<String> right);
 
   /**
    * Creates a new external string using the data defined in the given
@@ -1731,13 +1740,28 @@ class Function : public Object {
   V8EXPORT Handle<Value> GetName() const;
 
   /**
+   * Name inferred from variable or property assignment of this function.
+   * Used to facilitate debugging and profiling of JavaScript code written
+   * in an OO style, where many functions are anonymous but are assigned
+   * to object properties.
+   */
+  V8EXPORT Handle<Value> GetInferredName() const;
+
+  /**
    * Returns zero based line number of function body and
    * kLineOffsetNotFound if no information available.
    */
   V8EXPORT int GetScriptLineNumber() const;
+  /**
+   * Returns zero based column number of function body and
+   * kLineOffsetNotFound if no information available.
+   */
+  V8EXPORT int GetScriptColumnNumber() const;
+  V8EXPORT Handle<Value> GetScriptId() const;
   V8EXPORT ScriptOrigin GetScriptOrigin() const;
   static inline Function* Cast(Value* obj);
   V8EXPORT static const int kLineOffsetNotFound;
+
  private:
   V8EXPORT Function();
   V8EXPORT static void CheckCast(Value* obj);
@@ -2451,24 +2475,42 @@ class V8EXPORT TypeSwitch : public Data {
 
 // --- Extensions ---
 
+class V8EXPORT ExternalAsciiStringResourceImpl
+    : public String::ExternalAsciiStringResource {
+ public:
+  ExternalAsciiStringResourceImpl() : data_(0), length_(0) {}
+  ExternalAsciiStringResourceImpl(const char* data, size_t length)
+      : data_(data), length_(length) {}
+  const char* data() const { return data_; }
+  size_t length() const { return length_; }
+
+ private:
+  const char* data_;
+  size_t length_;
+};
 
 /**
  * Ignore
  */
 class V8EXPORT Extension {  // NOLINT
  public:
+  // Note that the strings passed into this constructor must live as long
+  // as the Extension itself.
   Extension(const char* name,
             const char* source = 0,
             int dep_count = 0,
-            const char** deps = 0);
+            const char** deps = 0,
+            int source_length = -1);
   virtual ~Extension() { }
   virtual v8::Handle<v8::FunctionTemplate>
       GetNativeFunction(v8::Handle<v8::String> name) {
     return v8::Handle<v8::FunctionTemplate>();
   }
 
-  const char* name() { return name_; }
-  const char* source() { return source_; }
+  const char* name() const { return name_; }
+  size_t source_length() const { return source_length_; }
+  const String::ExternalAsciiStringResource* source() const {
+    return &source_; }
   int dependency_count() { return dep_count_; }
   const char** dependencies() { return deps_; }
   void set_auto_enable(bool value) { auto_enable_ = value; }
@@ -2476,7 +2518,8 @@ class V8EXPORT Extension {  // NOLINT
 
  private:
   const char* name_;
-  const char* source_;
+  size_t source_length_;  // expected to initialize before source_
+  ExternalAsciiStringResourceImpl source_;
   int dep_count_;
   const char** deps_;
   bool auto_enable_;
@@ -2608,6 +2651,9 @@ typedef void (*MemoryAllocationCallback)(ObjectSpace space,
                                          AllocationAction action,
                                          int size);
 
+// --- Leave Script Callback ---
+typedef void (*CallCompletedCallback)();
+
 // --- Failed Access Check Callback ---
 typedef void (*FailedAccessCheckCallback)(Local<Object> target,
                                           AccessType type,
@@ -2687,7 +2733,7 @@ class RetainedObjectInfo;
  * default isolate is implicitly created and entered.  The embedder
  * can create additional isolates and use them in parallel in multiple
  * threads.  An isolate can be entered by at most one thread at any
- * given time.  The Locker/Unlocker API can be used to synchronize.
+ * given time.  The Locker/Unlocker API must be used to synchronize.
  */
 class V8EXPORT Isolate {
  public:
@@ -2818,6 +2864,31 @@ class V8EXPORT StartupDataDecompressor {  // NOLINT
  */
 typedef bool (*EntropySource)(unsigned char* buffer, size_t length);
 
+
+/**
+ * ReturnAddressLocationResolver is used as a callback function when v8 is
+ * resolving the location of a return address on the stack. Profilers that
+ * change the return address on the stack can use this to resolve the stack
+ * location to whereever the profiler stashed the original return address.
+ * When invoked, return_addr_location will point to a location on stack where
+ * a machine return address resides, this function should return either the
+ * same pointer, or a pointer to the profiler's copy of the original return
+ * address.
+ */
+typedef uintptr_t (*ReturnAddressLocationResolver)(
+    uintptr_t return_addr_location);
+
+
+/**
+ * Interface for iterating though all external resources in the heap.
+ */
+class V8EXPORT ExternalResourceVisitor {  // NOLINT
+ public:
+  virtual ~ExternalResourceVisitor() {}
+  virtual void VisitExternalString(Handle<String> string) {}
+};
+
+
 /**
  * Container class for static utility functions.
  */
@@ -3006,12 +3077,25 @@ class V8EXPORT V8 {
                                           AllocationAction action);
 
   /**
-   * This function removes callback which was installed by
-   * AddMemoryAllocationCallback function.
+   * Removes callback that was installed by AddMemoryAllocationCallback.
    */
   static void RemoveMemoryAllocationCallback(MemoryAllocationCallback callback);
 
   /**
+   * Adds a callback to notify the host application when a script finished
+   * running.  If a script re-enters the runtime during executing, the
+   * CallCompletedCallback is only invoked when the outer-most script
+   * execution ends.  Executing scripts inside the callback do not trigger
+   * further callbacks.
+   */
+  static void AddCallCompletedCallback(CallCompletedCallback callback);
+
+  /**
+   * Removes callback that was installed by AddCallCompletedCallback.
+   */
+  static void RemoveCallCompletedCallback(CallCompletedCallback callback);
+
+  /**
    * Allows the host application to group objects together. If one
    * object in the group is alive, all objects in the group are alive.
    * After each garbage collection, object groups are removed. It is
@@ -3049,6 +3133,13 @@ class V8EXPORT V8 {
   static void SetEntropySource(EntropySource source);
 
   /**
+   * Allows the host application to provide a callback that allows v8 to
+   * cooperate with a profiler that rewrites return addresses on stack.
+   */
+  static void SetReturnAddressLocationResolver(
+      ReturnAddressLocationResolver return_address_resolver);
+
+  /**
    * Adjusts the amount of registered external memory.  Used to give
    * V8 an indication of the amount of externally allocated memory
    * that is kept alive by JavaScript objects.  V8 uses this to decide
@@ -3161,14 +3252,25 @@ class V8EXPORT V8 {
   static void GetHeapStatistics(HeapStatistics* heap_statistics);
 
   /**
+   * Iterates through all external resources referenced from current isolate
+   * heap. This method is not expected to be used except for debugging purposes
+   * and may be quite slow.
+   */
+  static void VisitExternalResources(ExternalResourceVisitor* visitor);
+
+  /**
    * Optional notification that the embedder is idle.
    * V8 uses the notification to reduce memory footprint.
    * This call can be used repeatedly if the embedder remains idle.
    * Returns true if the embedder should stop calling IdleNotification
    * until real work has been done.  This indicates that V8 has done
    * as much cleanup as it will be able to do.
+   *
+   * The hint argument specifies the amount of work to be done in the function
+   * on scale from 1 to 1000. There is no guarantee that the actual work will
+   * match the hint.
    */
-  static bool IdleNotification();
+  static bool IdleNotification(int hint = 1000);
 
   /**
    * Optional notification that the system is running low on memory.
@@ -3466,6 +3568,12 @@ class V8EXPORT Context {
   void AllowCodeGenerationFromStrings(bool allow);
 
   /**
+   * Returns true if code generation from strings is allowed for the context.
+   * For more details see AllowCodeGenerationFromStrings(bool) documentation.
+   */
+  bool IsCodeGenerationFromStringsAllowed();
+
+  /**
    * Stack-allocated class which sets the execution context for all
    * operations executed within a local scope.
    */
@@ -3494,13 +3602,15 @@ class V8EXPORT Context {
  * accessing handles or holding onto object pointers obtained
  * from V8 handles while in the particular V8 isolate.  It is up
  * to the user of V8 to ensure (perhaps with locking) that this
- * constraint is not violated.
+ * constraint is not violated.  In addition to any other synchronization
+ * mechanism that may be used, the v8::Locker and v8::Unlocker classes
+ * must be used to signal thead switches to V8.
  *
  * v8::Locker is a scoped lock object. While it's
  * active (i.e. between its construction and destruction) the current thread is
- * allowed to use the locked isolate. V8 guarantees that an isolate can be locked
- * by at most one thread at any time. In other words, the scope of a v8::Locker is
- * a critical section.
+ * allowed to use the locked isolate. V8 guarantees that an isolate can be
+ * locked by at most one thread at any time. In other words, the scope of a
+ * v8::Locker is a critical section.
  *
  * Sample usage:
 * \code
@@ -3602,8 +3712,8 @@ class V8EXPORT Locker {
   static void StopPreemption();
 
   /**
-   * Returns whether or not the locker for a given isolate, or default isolate if NULL is given,
-   * is locked by the current thread.
+   * Returns whether or not the locker for a given isolate, or default isolate
+   * if NULL is given, is locked by the current thread.
    */
   static bool IsLocked(Isolate* isolate = NULL);
 
@@ -3677,8 +3787,8 @@ class V8EXPORT ActivityControl {  // NOLINT
 
 namespace internal {
 
-static const int kApiPointerSize = sizeof(void*);  // NOLINT
-static const int kApiIntSize = sizeof(int);  // NOLINT
+const int kApiPointerSize = sizeof(void*);  // NOLINT
+const int kApiIntSize = sizeof(int);  // NOLINT
 
 // Tag information for HeapObject.
 const int kHeapObjectTag = 1;
@@ -3769,7 +3879,7 @@ class Internals {
   static const int kFullStringRepresentationMask = 0x07;
   static const int kExternalTwoByteRepresentationTag = 0x02;
 
-  static const int kJSObjectType = 0xa3;
+  static const int kJSObjectType = 0xaa;
   static const int kFirstNonstringType = 0x80;
   static const int kForeignType = 0x85;
 
diff --git a/include/v8stdint.h b/include/v8stdint.h
index 50b4f29a..7c12e1f4 100644
--- a/include/v8stdint.h
+++ b/include/v8stdint.h
@@ -1,4 +1,4 @@
-// Copyright 2010 the V8 project authors. All rights reserved.
+// 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:
@@ -30,6 +30,7 @@
 #ifndef V8STDINT_H_
 #define V8STDINT_H_
 
+#include <stddef.h>
 #include <stdio.h>
 
 #if defined(_WIN32) && !defined(__MINGW32__)