Reland of Type Feedback Vector lives in the closure

src/objects-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 3372 matching lines @@
 }
 
 
 LiteralsArray* LiteralsArray::cast(Object* object) {
   SLOW_DCHECK(object->IsLiteralsArray());
   return reinterpret_cast<LiteralsArray*>(object);
 }
 
 
 TypeFeedbackVector* LiteralsArray::feedback_vector() const {
+  if (length() == 0) {
+    return TypeFeedbackVector::cast(
+        const_cast<FixedArray*>(FixedArray::cast(this)));
+  }
   return TypeFeedbackVector::cast(get(kVectorIndex));
 }
 
 
 void LiteralsArray::set_feedback_vector(TypeFeedbackVector* vector) {
+  if (length() <= kVectorIndex) {
+    DCHECK(vector->length() == 0);
+    return;
+  }
   set(kVectorIndex, vector);
 }
 
 
 Object* LiteralsArray::literal(int literal_index) const {
   return get(kFirstLiteralIndex + literal_index);
 }
 
 
 void LiteralsArray::set_literal(int literal_index, Object* literal) {
   set(kFirstLiteralIndex + literal_index, literal);
 }
 
+void LiteralsArray::set_literal_undefined(int literal_index) {
+  set_undefined(kFirstLiteralIndex + literal_index);
+}
 
 int LiteralsArray::literals_count() const {
   return length() - kFirstLiteralIndex;
 }
 
 
 void HandlerTable::SetRangeStart(int index, int value) {
   set(index * kRangeEntrySize + kRangeStartIndex, Smi::FromInt(value));
 }
 
@@ skipping 2193 matching lines @@
 
 SMI_ACCESSORS(BreakPointInfo, code_position, kCodePositionIndex)
 SMI_ACCESSORS(BreakPointInfo, source_position, kSourcePositionIndex)
 SMI_ACCESSORS(BreakPointInfo, statement_position, kStatementPositionIndex)
 ACCESSORS(BreakPointInfo, break_point_objects, Object, kBreakPointObjectsIndex)
 
 ACCESSORS(SharedFunctionInfo, name, Object, kNameOffset)
 ACCESSORS(SharedFunctionInfo, optimized_code_map, FixedArray,
           kOptimizedCodeMapOffset)
 ACCESSORS(SharedFunctionInfo, construct_stub, Code, kConstructStubOffset)
-ACCESSORS(SharedFunctionInfo, feedback_vector, TypeFeedbackVector,
-          kFeedbackVectorOffset)
+ACCESSORS(SharedFunctionInfo, feedback_metadata, TypeFeedbackMetadata,
+          kFeedbackMetadataOffset)
 #if TRACE_MAPS
 SMI_ACCESSORS(SharedFunctionInfo, unique_id, kUniqueIdOffset)
 #endif
 ACCESSORS(SharedFunctionInfo, instance_class_name, Object,
           kInstanceClassNameOffset)
 ACCESSORS(SharedFunctionInfo, function_data, Object, kFunctionDataOffset)
 ACCESSORS(SharedFunctionInfo, script, Object, kScriptOffset)
 ACCESSORS(SharedFunctionInfo, debug_info, Object, kDebugInfoOffset)
 ACCESSORS(SharedFunctionInfo, inferred_name, String, kInferredNameOffset)
 
@@ skipping 161 matching lines @@
 }
 
 
 void SharedFunctionInfo::set_kind(FunctionKind kind) {
   DCHECK(IsValidFunctionKind(kind));
   int hints = compiler_hints();
   hints = FunctionKindBits::update(hints, kind);
   set_compiler_hints(hints);
 }
 
+// static
+int SharedFunctionInfo::OffsetToPreviousContext() {
+  return FixedArray::kHeaderSize +
+         kPointerSize * (kContextOffset - kEntryLength);
+}
+
+int SharedFunctionInfo::OffsetToPreviousCachedCode() {
+  return FixedArray::kHeaderSize +
+         kPointerSize * (kCachedCodeOffset - kEntryLength);
+}
+
+int SharedFunctionInfo::OffsetToPreviousLiterals() {
+  return FixedArray::kHeaderSize +
+         kPointerSize * (kLiteralsOffset - kEntryLength);
+}
+
+int SharedFunctionInfo::OffsetToPreviousOsrAstId() {
+  return FixedArray::kHeaderSize +
+         kPointerSize * (kOsrAstIdOffset - kEntryLength);
+}
 
 BOOL_ACCESSORS(SharedFunctionInfo, compiler_hints, needs_home_object,
                kNeedsHomeObject)
 BOOL_ACCESSORS(SharedFunctionInfo, compiler_hints, native, kNative)
 BOOL_ACCESSORS(SharedFunctionInfo, compiler_hints, force_inline, kForceInline)
 BOOL_ACCESSORS(SharedFunctionInfo, compiler_hints,
                name_should_print_as_anonymous,
                kNameShouldPrintAsAnonymous)
 BOOL_ACCESSORS(SharedFunctionInfo, compiler_hints, is_anonymous, kIsAnonymous)
 BOOL_ACCESSORS(SharedFunctionInfo, compiler_hints, is_function, kIsFunction)
@@ skipping 431 matching lines @@
 }
 
 
 bool JSFunction::is_compiled() {
   Builtins* builtins = GetIsolate()->builtins();
   return code() != builtins->builtin(Builtins::kCompileLazy) &&
          code() != builtins->builtin(Builtins::kCompileOptimized) &&
          code() != builtins->builtin(Builtins::kCompileOptimizedConcurrent);
 }
 
-
-int JSFunction::NumberOfLiterals() {
-  return literals()->length();
+TypeFeedbackVector* JSFunction::feedback_vector() {
+  LiteralsArray* array = literals();
+  return array->feedback_vector();
 }
 
+int JSFunction::NumberOfLiterals() { return literals()->literals_count(); }
 
 ACCESSORS(JSProxy, target, JSReceiver, kTargetOffset)
 ACCESSORS(JSProxy, handler, Object, kHandlerOffset)
 ACCESSORS(JSProxy, hash, Object, kHashOffset)
 
 bool JSProxy::IsRevoked() const { return !handler()->IsJSReceiver(); }
 
 ACCESSORS(JSCollection, table, Object, kTableOffset)
 
 
@@ skipping 1545 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_