[stubs] Add a utility class to generate code to access builtin arguments

test/cctest/compiler/code-assembler-tester.h

 // Copyright 2016 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/handles.h"
 #include "src/interface-descriptors.h"
 #include "src/isolate.h"
 #include "test/cctest/compiler/function-tester.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 class ZoneHolder {
  public:
   explicit ZoneHolder(Isolate* isolate)
-      : zone_(isolate->allocator(), ZONE_NAME) {}
-  Zone* zone() { return &zone_; }
+      : held_zone_(isolate->allocator(), ZONE_NAME) {}
+  Zone* held_zone() { return &held_zone_; }
 
  private:
-  Zone zone_;
+  Zone held_zone_;
 };
 
 // Inherit from ZoneHolder in order to create a zone that can be passed to
 // CodeAssembler base class constructor.
 template <typename CodeAssemblerT>
 class CodeAssemblerTesterImpl : private ZoneHolder, public CodeAssemblerT {
  public:
   // Test generating code for a stub.
   CodeAssemblerTesterImpl(Isolate* isolate,
                           const CallInterfaceDescriptor& descriptor)
       : ZoneHolder(isolate),
-        CodeAssemblerT(isolate, ZoneHolder::zone(), descriptor,
+        CodeAssemblerT(isolate, ZoneHolder::held_zone(), descriptor,
                        Code::ComputeFlags(Code::STUB), "test"),
         scope_(isolate) {}
 
   // Test generating code for a JS function (e.g. builtins).
   CodeAssemblerTesterImpl(Isolate* isolate, int parameter_count)
       : ZoneHolder(isolate),
-        CodeAssemblerT(isolate, ZoneHolder::zone(), parameter_count,
+        CodeAssemblerT(isolate, ZoneHolder::held_zone(), parameter_count,
                        Code::ComputeFlags(Code::FUNCTION), "test"),
         scope_(isolate) {}
 
   // This constructor is intended to be used for creating code objects with
   // specific flags.
   CodeAssemblerTesterImpl(Isolate* isolate, Code::Flags flags)
       : ZoneHolder(isolate),
-        CodeAssemblerT(isolate, ZoneHolder::zone(), 0, flags, "test"),
+        CodeAssemblerT(isolate, ZoneHolder::held_zone(), 0, flags, "test"),
         scope_(isolate) {}
 
   Handle<Code> GenerateCodeCloseAndEscape() {
     return scope_.CloseAndEscape(CodeAssemblerT::GenerateCode());
   }
 
  private:
   HandleScope scope_;
   LocalContext context_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8