Fix usage of literal cloning for large double arrays.

src/code-stubs.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.
 
 #ifndef V8_CODE_STUBS_H_
 #define V8_CODE_STUBS_H_
 
 #include "src/allocation.h"
 #include "src/assembler.h"
 #include "src/codegen.h"
 #include "src/globals.h"
 #include "src/ic/ic-state.h"
 #include "src/interface-descriptors.h"
 #include "src/macro-assembler.h"
 #include "src/ostreams.h"
 #include "src/type-hints.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 class CodeStubAssembler;
-class ObjectLiteral;
 namespace compiler {
 class CodeAssemblerLabel;
 class CodeAssemblerState;
 class Node;
 }
 
 // List of code stubs used on all platforms.
 #define CODE_STUB_LIST_ALL_PLATFORMS(V)       \
   /* --- PlatformCodeStubs --- */             \
   V(ArrayConstructor)                         \
@@ skipping 882 matching lines @@
                                   compiler::Node* flags,
                                   compiler::Node* context);
 
  private:
   DEFINE_CALL_INTERFACE_DESCRIPTOR(FastCloneRegExp);
   DEFINE_TURBOFAN_CODE_STUB(FastCloneRegExp, TurboFanCodeStub);
 };
 
 class FastCloneShallowArrayStub : public TurboFanCodeStub {
  public:
+  // Maximum number of elements in copied array (chosen so that even an array
+  // backed by a double backing store will fit into new-space).
+  static const int kMaximumClonedElements =
+      JSArray::kInitialMaxFastElementArray * kPointerSize / kDoubleSize;
+
   FastCloneShallowArrayStub(Isolate* isolate,
                             AllocationSiteMode allocation_site_mode)
       : TurboFanCodeStub(isolate) {
     minor_key_ = AllocationSiteModeBits::encode(allocation_site_mode);
   }
 
   static compiler::Node* Generate(CodeStubAssembler* assembler,
                                   compiler::Node* closure,
                                   compiler::Node* literal_index,
                                   compiler::Node* context,
@@ skipping 21 matching lines @@
     DCHECK_GE(length, 0);
     DCHECK_LE(length, kMaximumClonedProperties);
     minor_key_ = LengthBits::encode(LengthBits::encode(length));
   }
 
   static compiler::Node* GenerateFastPath(
       CodeStubAssembler* assembler, compiler::CodeAssemblerLabel* call_runtime,
       compiler::Node* closure, compiler::Node* literals_index,
       compiler::Node* properties_count);
 
-  static bool IsSupported(ObjectLiteral* expr);
   static int PropertiesCount(int literal_length);
 
   int length() const { return LengthBits::decode(minor_key_); }
 
  private:
   class LengthBits : public BitField<int, 0, 4> {};
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(FastCloneShallowObject);
   DEFINE_TURBOFAN_CODE_STUB(FastCloneShallowObject, TurboFanCodeStub);
 };
@@ skipping 1665 matching lines @@
 #undef DEFINE_PLATFORM_CODE_STUB
 #undef DEFINE_HANDLER_CODE_STUB
 #undef DEFINE_HYDROGEN_CODE_STUB
 #undef DEFINE_CODE_STUB
 #undef DEFINE_CODE_STUB_BASE
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODE_STUBS_H_