test-decls.cc.svn-base

Google浏览器V8内核代码

// Copyright 2007-2008 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
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//
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#include <stdlib.h>

#include "v8.h"

#include "heap.h"
#include "cctest.h"

using namespace v8;


enum Expectations {
  EXPECT_RESULT,
  EXPECT_EXCEPTION
};


// A DeclarationContext holds a reference to a v8::Context and keeps
// track of various declaration related counters to make it easier to
// track if global declarations in the presence of interceptors behave
// the right way.
class DeclarationContext {
 public:
  DeclarationContext();

  virtual ~DeclarationContext() {
    if (is_initialized_) {
      context_->Exit();
      context_.Dispose();
    }
  }

  void Check(const char* source,
             int get, int set, int has,
             Expectations expectations,
             v8::Handle<Value> value = Local<Value>());

  int get_count() const { return get_count_; }
  int set_count() const { return set_count_; }
  int has_count() const { return has_count_; }

 protected:
  virtual v8::Handle<Value> Get(Local<String> key);
  virtual v8::Handle<Value> Set(Local<String> key, Local<Value> value);
  virtual v8::Handle<Boolean> Has(Local<String> key);

  void InitializeIfNeeded();

  // Get the holder for the interceptor. Default to the instance template
  // but may be overwritten.
  virtual Local<ObjectTemplate> GetHolder(Local<FunctionTemplate> function) {
    return function->InstanceTemplate();
  }

  // The handlers are called as static functions that forward
  // to the instance specific virtual methods.
  static v8::Handle<Value> HandleGet(Local<String> key,
                                     const AccessorInfo& info);
  static v8::Handle<Value> HandleSet(Local<String> key,
                                     Local<Value> value,
                                     const AccessorInfo& info);
  static v8::Handle<Boolean> HandleHas(Local<String> key,
                                       const AccessorInfo& info);

 private:
  bool is_initialized_;
  Persistent<Context> context_;
  Local<String> property_;

  int get_count_;
  int set_count_;
  int has_count_;

  static DeclarationContext* GetInstance(const AccessorInfo& info);
};


DeclarationContext::DeclarationContext()
    : is_initialized_(false), get_count_(0), set_count_(0), has_count_(0) {
  // Do nothing.
}


void DeclarationContext::InitializeIfNeeded() {
  if (is_initialized_) return;
  HandleScope scope;
  Local<FunctionTemplate> function = FunctionTemplate::New();
  Local<Value> data = Integer::New(reinterpret_cast<intptr_t>(this));
  GetHolder(function)->SetNamedPropertyHandler(&HandleGet,
                                               &HandleSet,
                                               &HandleHas,
                                               0, 0,
                                               data);
  context_ = Context::New(0, function->InstanceTemplate(), Local<Value>());
  context_->Enter();
  is_initialized_ = true;
}


void DeclarationContext::Check(const char* source,
                               int get, int set, int has,
                               Expectations expectations,
                               v8::Handle<Value> value) {
  InitializeIfNeeded();
  // A retry after a GC may pollute the counts, so perform gc now
  // to avoid that.
  v8::internal::Heap::CollectGarbage(0, v8::internal::NEW_SPACE);
  HandleScope scope;
  TryCatch catcher;
  catcher.SetVerbose(true);
  Local<Value> result = Script::Compile(String::New(source))->Run();
  CHECK_EQ(get, get_count());
  CHECK_EQ(set, set_count());
  CHECK_EQ(has, has_count());
  if (expectations == EXPECT_RESULT) {
    CHECK(!catcher.HasCaught());
    if (!value.IsEmpty()) {
      CHECK_EQ(value, result);
    }
  } else {
    CHECK(expectations == EXPECT_EXCEPTION);
    CHECK(catcher.HasCaught());
    if (!value.IsEmpty()) {
      CHECK_EQ(value, catcher.Exception());
    }
  }
}


v8::Handle<Value> DeclarationContext::HandleGet(Local<String> key,
                                                const AccessorInfo& info) {
  DeclarationContext* context = GetInstance(info);
  context->get_count_++;
  return context->Get(key);
}


v8::Handle<Value> DeclarationContext::HandleSet(Local<String> key,
                                                Local<Value> value,
                                                const AccessorInfo& info) {
  DeclarationContext* context = GetInstance(info);
  context->set_count_++;
  return context->Set(key, value);
}


v8::Handle<Boolean> DeclarationContext::HandleHas(Local<String> key,
                                                  const AccessorInfo& info) {
  DeclarationContext* context = GetInstance(info);
  context->has_count_++;
  return context->Has(key);
}


DeclarationContext* DeclarationContext::GetInstance(const AccessorInfo& info) {
  Local<Value> data = info.Data();
  return reinterpret_cast<DeclarationContext*>(Int32::Cast(*data)->Value());
}


v8::Handle<Value> DeclarationContext::Get(Local<String> key) {
  return v8::Handle<Value>();
}


v8::Handle<Value> DeclarationContext::Set(Local<String> key,
                                          Local<Value> value) {
  return v8::Handle<Value>();
}


v8::Handle<Boolean> DeclarationContext::Has(Local<String> key) {
  return v8::Handle<Boolean>();
}


// Test global declaration of a property the interceptor doesn't know
// about and doesn't handle.
TEST(Unknown) {
  HandleScope scope;

  { DeclarationContext context;
    context.Check("var x; x",
                  1,  // access
                  1,  // declaration
                  2,  // declaration + initialization
                  EXPECT_RESULT, Undefined());
  }

  { DeclarationContext context;
    context.Check("var x = 0; x",
                  1,  // access
                  2,  // declaration + initialization
                  2,  // declaration + initialization
                  EXPECT_RESULT, Number::New(0));
  }

  { DeclarationContext context;
    context.Check("function x() { }; x",
                  1,  // access
                  1,  // declaration
                  0,
                  EXPECT_RESULT);
  }

  { DeclarationContext context;
    context.Check("const x; x",
                  1,  // access
                  2,  // declaration + initialization
                  2,  // declaration + initialization
                  EXPECT_RESULT, Undefined());
  }

  { DeclarationContext context;
    context.Check("const x = 0; x",
                  1,  // access
                  2,  // declaration + initialization
                  2,  // declaration + initialization
                  EXPECT_RESULT, Undefined());  // SB 0 - BUG 1213579
  }
}



class PresentPropertyContext: public DeclarationContext {
 protected:
  virtual v8::Handle<Boolean> Has(Local<String> key) {
    return True();
  }
};



TEST(Present) {
  HandleScope scope;

  { PresentPropertyContext context;
    context.Check("var x; x",
                  1,  // access
                  0,
                  2,  // declaration + initialization
                  EXPECT_EXCEPTION);  // x is not defined!
  }

  { PresentPropertyContext context;
    context.Check("var x = 0; x",
                  1,  // access
                  1,  // initialization
                  2,  // declaration + initialization
                  EXPECT_RESULT, Number::New(0));
  }

  { PresentPropertyContext context;
    context.Check("function x() { }; x",
                  1,  // access
                  1,  // declaration
                  0,
                  EXPECT_RESULT);
  }

  { PresentPropertyContext context;
    context.Check("const x; x",
                  0,
                  0,
                  1,  // (re-)declaration
                  EXPECT_EXCEPTION);  // x has already been declared!
  }

  { PresentPropertyContext context;
    context.Check("const x = 0; x",
                  0,
                  0,