commit 4668a2c7a746d01b382f23aa32e163701e3075f8
author ricow@chromium.org <ricow@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00> Mon Aug 29 10:41:00 2011 +0000
committer ricow@chromium.org <ricow@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00> Mon Aug 29 10:41:00 2011 +0000
tree a683b729446ee71f3f59a8fb0708d3b130620d9c
parent ddd545c4c343dcf4331b9d80d2a0bdfa373a4a0f

Version 3.5.9.

Made FromPropertyDescriptor not trigger inherited setters.

Fixed .gyp files to work on the ARM simulator.

Fixed shared library build warnings for MSVS.


git-svn-id: http://v8.googlecode.com/svn/trunk@9041 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects-inl.h

diff --git a/src/objects-inl.h b/src/objects-inl.h
index 098bd7a..b4c6a3a 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -178,10 +178,14 @@
 
 
 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();
 }
 
 
@@ -269,6 +273,38 @@
 }
 
 
+bool String::IsAsciiRepresentationUnderneath() {
+  uint32_t type = map()->instance_type();
+  STATIC_ASSERT(kIsIndirectStringTag != 0);
+  STATIC_ASSERT((kIsIndirectStringMask & kStringEncodingMask) == 0);
+  ASSERT(IsFlat());
+  switch (type & (kIsIndirectStringMask | kStringEncodingMask)) {
+    case kAsciiStringTag:
+      return true;
+    case kTwoByteStringTag:
+      return false;
+    default:  // Cons or sliced string.  Need to go deeper.
+      return GetUnderlying()->IsAsciiRepresentation();
+  }
+}
+
+
+bool String::IsTwoByteRepresentationUnderneath() {
+  uint32_t type = map()->instance_type();
+  STATIC_ASSERT(kIsIndirectStringTag != 0);
+  STATIC_ASSERT((kIsIndirectStringMask & kStringEncodingMask) == 0);
+  ASSERT(IsFlat());
+  switch (type & (kIsIndirectStringMask | kStringEncodingMask)) {
+    case kAsciiStringTag:
+      return false;
+    case kTwoByteStringTag:
+      return true;
+    default:  // Cons or sliced string.  Need to go deeper.
+      return GetUnderlying()->IsTwoByteRepresentation();
+  }
+}
+
+
 bool String::HasOnlyAsciiChars() {
   uint32_t type = map()->instance_type();
   return (type & kStringEncodingMask) == kAsciiStringTag ||
@@ -281,6 +317,16 @@
 }
 
 
+bool StringShape::IsSliced() {
+  return (type_ & kStringRepresentationMask) == kSlicedStringTag;
+}
+
+
+bool StringShape::IsIndirect() {
+  return (type_ & kIsIndirectStringMask) == kIsIndirectStringTag;
+}
+
+
 bool StringShape::IsExternal() {
   return (type_ & kStringRepresentationMask) == kExternalStringTag;
 }
@@ -2075,6 +2121,7 @@
 CAST_ACCESSOR(SeqString)
 CAST_ACCESSOR(SeqAsciiString)
 CAST_ACCESSOR(SeqTwoByteString)
+CAST_ACCESSOR(SlicedString)
 CAST_ACCESSOR(ConsString)
 CAST_ACCESSOR(ExternalString)
 CAST_ACCESSOR(ExternalAsciiString)
@@ -2156,7 +2203,7 @@
 MaybeObject* String::TryFlatten(PretenureFlag pretenure) {
   if (!StringShape(this).IsCons()) return this;
   ConsString* cons = ConsString::cast(this);
-  if (cons->second()->length() == 0) return cons->first();
+  if (cons->IsFlat()) return cons->first();
   return SlowTryFlatten(pretenure);
 }
 
@@ -2164,10 +2211,8 @@
 String* String::TryFlattenGetString(PretenureFlag pretenure) {
   MaybeObject* flat = TryFlatten(pretenure);
   Object* successfully_flattened;
-  if (flat->ToObject(&successfully_flattened)) {
-    return String::cast(successfully_flattened);
-  }
-  return this;
+  if (!flat->ToObject(&successfully_flattened)) return this;
+  return String::cast(successfully_flattened);
 }
 
 
@@ -2185,6 +2230,9 @@
       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;
   }
@@ -2205,15 +2253,19 @@
 
 
 bool String::IsFlat() {
-  switch (StringShape(this).representation_tag()) {
-    case kConsStringTag: {
-      String* second = ConsString::cast(this)->second();
-      // Only flattened strings have second part empty.
-      return second->length() == 0;
-    }
-    default:
-      return true;
-  }
+  if (!StringShape(this).IsCons()) return true;
+  return ConsString::cast(this)->second()->length() == 0;
+}
+
+
+String* String::GetUnderlying() {
+  // Giving direct access to underlying string only makes sense if the
+  // wrapping string is already flattened.
+  ASSERT(this->IsFlat());
+  ASSERT(StringShape(this).IsIndirect());
+  STATIC_ASSERT(ConsString::kFirstOffset == SlicedString::kParentOffset);
+  const int kUnderlyingOffset = SlicedString::kParentOffset;
+  return String::cast(READ_FIELD(this, kUnderlyingOffset));
 }
 
 
@@ -2272,6 +2324,20 @@
 }
 
 
+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));
 }