Provide a convenience array buffer allocator

tools/parser-shell.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 27 matching lines @@
 #include "src/compiler.h"
 #include "src/parsing/scanner-character-streams.h"
 #include "src/parsing/parser.h"
 #include "src/parsing/preparse-data-format.h"
 #include "src/parsing/preparse-data.h"
 #include "src/parsing/preparser.h"
 #include "tools/shell-utils.h"
 
 using namespace v8::internal;
 
-class ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
- public:
-  virtual void* Allocate(size_t length) {
-    void* data = AllocateUninitialized(length);
-    return data == NULL ? data : memset(data, 0, length);
-  }
-  virtual void* AllocateUninitialized(size_t length) { return malloc(length); }
-  virtual void Free(void* data, size_t) { free(data); }
-};
-
 class StringResource8 : public v8::String::ExternalOneByteStringResource {
  public:
   StringResource8(const char* data, int length)
       : data_(data), length_(length) { }
   virtual size_t length() const { return length_; }
   virtual const char* data() const { return data_; }
 
  private:
   const char* data_;
   int length_;
@@ skipping 93 matching lines @@
       encoding = UTF16;
     } else if (strncmp(argv[i], "--benchmark=", 12) == 0) {
       benchmark = std::string(argv[i]).substr(12);
     } else if (strncmp(argv[i], "--repeat=", 9) == 0) {
       std::string repeat_str = std::string(argv[i]).substr(9);
       repeat = atoi(repeat_str.c_str());
     } else if (i > 0 && argv[i][0] != '-') {
       fnames.push_back(std::string(argv[i]));
     }
   }
-  ArrayBufferAllocator array_buffer_allocator;
   v8::Isolate::CreateParams create_params;
-  create_params.array_buffer_allocator = &array_buffer_allocator;
+  create_params.array_buffer_allocator =
+      v8::ArrayBuffer::Allocator::NewDefaultAllocator();
   v8::Isolate* isolate = v8::Isolate::New(create_params);
   {
     v8::Isolate::Scope isolate_scope(isolate);
     v8::HandleScope handle_scope(isolate);
     v8::Local<v8::ObjectTemplate> global = v8::ObjectTemplate::New(isolate);
     v8::Local<v8::Context> context = v8::Context::New(isolate, NULL, global);
     DCHECK(!context.IsEmpty());
     {
       v8::Context::Scope scope(context);
       double first_parse_total = 0;
       double second_parse_total = 0;
       for (size_t i = 0; i < fnames.size(); i++) {
         std::pair<v8::base::TimeDelta, v8::base::TimeDelta> time =
             RunBaselineParser(fnames[i].c_str(), encoding, repeat, isolate,
                               context);
         first_parse_total += time.first.InMillisecondsF();
         second_parse_total += time.second.InMillisecondsF();
       }
       if (benchmark.empty()) benchmark = "Baseline";
       printf("%s(FirstParseRunTime): %.f ms\n", benchmark.c_str(),
              first_parse_total);
       printf("%s(SecondParseRunTime): %.f ms\n", benchmark.c_str(),
              second_parse_total);
     }
   }
   v8::V8::Dispose();
   v8::V8::ShutdownPlatform();
   delete platform;
+  delete create_params.array_buffer_allocator;
   return 0;
 }