Ensure object literal element boilerplates aren't modified.

src/full-codegen.cc

 // 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.
 
 #include "src/v8.h"
 
 #include "src/ast.h"
 #include "src/ast-numbering.h"
 #include "src/code-factory.h"
 #include "src/codegen.h"
@@ skipping 397 matching lines @@
 
 
 void FullCodeGenerator::PopulateTypeFeedbackInfo(Handle<Code> code) {
   Handle<TypeFeedbackInfo> info = isolate()->factory()->NewTypeFeedbackInfo();
   info->set_ic_total_count(ic_total_count_);
   DCHECK(!isolate()->heap()->InNewSpace(*info));
   code->set_type_feedback_info(*info);
 }
 
 
+bool FullCodeGenerator::MustCreateObjectLiteralWithRuntime(
+    ObjectLiteral* expr) const {
+  return expr->may_store_doubles() || expr->depth() > 1 ||
+         masm()->serializer_enabled() ||
+         expr->ComputeFlags() != ObjectLiteral::kFastElements ||
+         expr->has_elements() ||

[Toon Verwaest, 2015/03/30 08:42:20]

Add a comment that fast-clone-shallow-object doesn't copy elements, and that
object literals don't support cow elements for now.

[mvstanton, 2015/03/30 08:59:38]

Done.

+         expr->properties_count() >
+             FastCloneShallowObjectStub::kMaximumClonedProperties;
+}
+
+
+bool FullCodeGenerator::MustCreateArrayLiteralWithRuntime(
+    ArrayLiteral* expr) const {
+  return expr->depth() > 1 ||
+         expr->values()->length() > JSObject::kInitialMaxFastElementArray;
+}
+
+
 void FullCodeGenerator::Initialize() {
   InitializeAstVisitor(info_->isolate(), info_->zone());
   // The generation of debug code must match between the snapshot code and the
   // code that is generated later.  This is assumed by the debugger when it is
   // calculating PC offsets after generating a debug version of code.  Therefore
   // we disable the production of debug code in the full compiler if we are
   // either generating a snapshot or we booted from a snapshot.
   generate_debug_code_ = FLAG_debug_code && !masm_->serializer_enabled() &&
                          !info_->isolate()->snapshot_available();
   masm_->set_emit_debug_code(generate_debug_code_);
@@ skipping 1395 matching lines @@
   }
   codegen_->PrepareForBailoutForId(exit_id_, NO_REGISTERS);
   codegen_->scope_ = saved_scope_;
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal