commit b0fe1620dcb4135ac3ab2d66ff93072373911299
author Ben Murdoch <benm@google.com> Thu May 05 13:52:32 2011 +0100
committer Ben Murdoch <benm@google.com> Tue May 10 15:41:47 2011 +0100
tree 3487cdc7e01ec56a6f84ea20f4bae596a0b73986
parent df5bff59602802b769e994b0dc1d8869a27fa40c

Update V8 to r6101 as required by WebKit r74534

Change-Id: I7f84af8dd732f11898fd644b2c2b1538914cb78d

src/utils.h

diff --git a/src/utils.h b/src/utils.h
index 69c062f..62b8726 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -226,6 +226,11 @@
   static T decode(uint32_t value) {
     return static_cast<T>((value & mask()) >> shift);
   }
+
+  // Value for the field with all bits set.
+  static T max() {
+    return decode(mask());
+  }
 };
 
 
@@ -326,7 +331,7 @@
     return start_[index];
   }
 
-  T& at(int i) const { return operator[](i); }
+  const T& at(int index) const { return operator[](index); }
 
   T& first() { return start_[0]; }
 
@@ -387,11 +392,40 @@
 };
 
 
+// A pointer that can only be set once and doesn't allow NULL values.
+template<typename T>
+class SetOncePointer {
+ public:
+  SetOncePointer() : pointer_(NULL) { }
+
+  bool is_set() const { return pointer_ != NULL; }
+
+  T* get() const {
+    ASSERT(pointer_ != NULL);
+    return pointer_;
+  }
+
+  void set(T* value) {
+    ASSERT(pointer_ == NULL && value != NULL);
+    pointer_ = value;
+  }
+
+ private:
+  T* pointer_;
+};
+
+
 template <typename T, int kSize>
 class EmbeddedVector : public Vector<T> {
  public:
   EmbeddedVector() : Vector<T>(buffer_, kSize) { }
 
+  explicit EmbeddedVector(T initial_value) : Vector<T>(buffer_, kSize) {
+    for (int i = 0; i < kSize; ++i) {
+      buffer_[i] = initial_value;
+    }
+  }
+
   // When copying, make underlying Vector to reference our buffer.
   EmbeddedVector(const EmbeddedVector& rhs)
       : Vector<T>(rhs) {