Tentative implementation of string slices (hidden under the flag --string-slices).

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 53a3183694cbfdfc87f16524888036e27d434d14..1c0ab9d70eb219bee5697e172bcde746c970836c 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -177,10 +177,14 @@ bool Object::IsSymbol() {
 
 
 bool Object::IsConsString() {
-  if (!this->IsHeapObject()) return false;
-  uint32_t type = HeapObject::cast(this)->map()->instance_type();
-  return (type & (kIsNotStringMask | kStringRepresentationMask)) ==
-         (kStringTag | kConsStringTag);
+  if (!IsString()) return false;
+    return StringShape(String::cast(this)).IsCons();
+}
+
+
+bool Object::IsSlicedString() {
+  if (!IsString()) return false;
+  return StringShape(String::cast(this)).IsSliced();
 }
 
 
@@ -280,6 +284,11 @@ bool StringShape::IsCons() {
 }
 
 
+bool StringShape::IsSliced() {
+  return (type_ & kStringRepresentationMask) == kSlicedStringTag;
+}
+
+
 bool StringShape::IsExternal() {
   return (type_ & kStringRepresentationMask) == kExternalStringTag;
 }
@@ -2041,6 +2050,7 @@ CAST_ACCESSOR(String)
 CAST_ACCESSOR(SeqString)
 CAST_ACCESSOR(SeqAsciiString)
 CAST_ACCESSOR(SeqTwoByteString)
+CAST_ACCESSOR(SlicedString)
 CAST_ACCESSOR(ConsString)
 CAST_ACCESSOR(ExternalString)
 CAST_ACCESSOR(ExternalAsciiString)
@@ -2156,6 +2166,9 @@ uint16_t String::Get(int index) {
       return ExternalAsciiString::cast(this)->ExternalAsciiStringGet(index);
     case kExternalStringTag | kTwoByteStringTag:
       return ExternalTwoByteString::cast(this)->ExternalTwoByteStringGet(index);
+    case kSlicedStringTag | kAsciiStringTag:
+    case kSlicedStringTag | kTwoByteStringTag:
+      return SlicedString::cast(this)->SlicedStringGet(index);
     default:
       break;
   }
@@ -2243,6 +2256,20 @@ int SeqAsciiString::SeqAsciiStringSize(InstanceType instance_type) {
 }
 
 
+String* SlicedString::parent() {
+  return String::cast(READ_FIELD(this, kParentOffset));
+}
+
+
+void SlicedString::set_parent(String* parent) {
+  ASSERT(parent->IsSeqString());
+  WRITE_FIELD(this, kParentOffset, parent);
+}
+
+
+SMI_ACCESSORS(SlicedString, offset, kOffsetOffset)
+
+
 String* ConsString::first() {
   return String::cast(READ_FIELD(this, kFirstOffset));
 }