Implement code stub for object literal creation.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 16826db9e8e819a1be2f9ef41955ec799463ba20..8ee694f25f97799accc726f24816bd7b3e777f89 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -58,6 +58,7 @@ namespace internal {
   V(FastNewContext)                      \
   V(FastNewBlockContext)                 \
   V(FastCloneShallowArray)               \
+  V(FastCloneShallowObject)              \
   V(ToBoolean)                           \
   V(ToNumber)                            \
   V(ArgumentsAccess)                     \
@@ -380,6 +381,26 @@ class FastCloneShallowArrayStub : public CodeStub {
 };
 
 
+class FastCloneShallowObjectStub : public CodeStub {
+ public:
+  // Maximum number of properties in copied object.
+  static const int kMaximumClonedProperties = 6;
+
+  FastCloneShallowObjectStub(int length) : length_(length) {
+    ASSERT(length_ >= 0);

[fschneider, 2011/11/21 12:27:03]

Maybe use ASSERT_GE / ASSERT_LE instead of ASSERT.

[Michael Starzinger, 2011/11/21 13:28:15]

Done.

+    ASSERT(length_ <= kMaximumClonedProperties);
+  }
+
+  void Generate(MacroAssembler* masm);
+
+ private:
+  int length_;
+
+  Major MajorKey() { return FastCloneShallowObject; }
+  int MinorKey() { return length_; }
+};
+
+
 class InstanceofStub: public CodeStub {
  public:
   enum Flags {