CSE2410 Fall 2014 Bounce

// Copyright 2007-2008 the V8 project authors. All rights reserved.

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// modification, are permitted provided that the following conditions are

// met:

//

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//

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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

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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,

                  1,  // (re-)declaration

                  EXPECT_EXCEPTION);  // x has already been declared!

  }

}

class AbsentPropertyContext: public DeclarationContext {

 protected:

  virtual v8::Handle<Boolean> Has(Local<String> key) {

    return False();

  }

};

TEST(Absent) {

  HandleScope scope;

  { AbsentPropertyContext context;

    context.Check("var x; x",

                  1,  // access

                  2,  // declaration + initialization

                  2,  // declaration + initialization

                  EXPECT_RESULT, Undefined());

  }

  { AbsentPropertyContext context;

    context.Check("var x = 0; x",

                  1,  // access

                  2,  // declaration + initialization

                  2,  // declaration + initialization

                  EXPECT_RESULT, Number::New(0));

  }

  { AbsentPropertyContext context;

    context.Check("function x() { }; x",

                  1,  // access

                  1,  // declaration

                  0,

                  EXPECT_RESULT);

  }

  { AbsentPropertyContext context;

    context.Check("const x; x",

                  1,  // access

                  2,  // declaration + initialization

                  2,  // declaration + initializetion

                  EXPECT_RESULT, Undefined());

  }

  { AbsentPropertyContext context;

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

                  1,  // access

                  2,  // declaration + initialization

                  2,  // declaration + initialization

                  EXPECT_RESULT, Undefined());  // SB 0 - BUG 1213579

  }

  { AbsentPropertyContext context;

    context.Check("if (false) { var x = 0 }; x",

                  1,  // access

                  1,  // declaration

                  1,  // declaration + initialization

                  EXPECT_RESULT, Undefined());

  }

}

class AppearingPropertyContext: public DeclarationContext {

 public:

  enum State {

    DECLARE,

    INITIALIZE_IF_ASSIGN,

    UNKNOWN

  };

  AppearingPropertyContext() : state_(DECLARE) { }

 protected:

  virtual v8::Handle<Boolean> Has(Local<String> key) {

    switch (state_) {

      case DECLARE:

        // Force declaration by returning that the

        // property is absent.

        state_ = INITIALIZE_IF_ASSIGN;

        return False();

      case INITIALIZE_IF_ASSIGN:

        // Return that the property is present so we only get the

        // setter called when initializing with a value.

        state_ = UNKNOWN;

        return True();

      default:

        ASSERT(state_ == UNKNOWN);

        break;

    }

    // Do the lookup in the object.

    return v8::Local<Boolean>();

  }

 private:

  State state_;

};

TEST(Appearing) {

  HandleScope scope;

  { AppearingPropertyContext context;

    context.Check("var x; x",

                  1,  // access

                  1,  // declaration

                  2,  // declaration + initialization

                  EXPECT_RESULT, Undefined());

  }

  { AppearingPropertyContext context;

    context.Check("var x = 0; x",

                  1,  // access

                  2,  // declaration + initialization

                  2,  // declaration + initialization

                  EXPECT_RESULT, Number::New(0));

  }

  { AppearingPropertyContext context;

    context.Check("function x() { }; x",

                  1,  // access

                  1,  // declaration

                  0,

                  EXPECT_RESULT);

  }

  { AppearingPropertyContext context;

    context.Check("const x; x",

                  0,

                  1,  // declaration

                  2,  // declaration + initialization

                  EXPECT_EXCEPTION);  // x has already been declared!

  }

  { AppearingPropertyContext context;

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

                  0,

                  1,  // declaration

                  2,  // declaration + initialization

                  EXPECT_EXCEPTION);  //  x has already been declared!

  }

}

class ReappearingPropertyContext: public DeclarationContext {

 public:

  enum State {

    DECLARE,

    DONT_DECLARE,

    INITIALIZE,

    UNKNOWN

  };

  ReappearingPropertyContext() : state_(DECLARE) { }

 protected:

  virtual v8::Handle<Boolean> Has(Local<String> key) {

    switch (state_) {

      case DECLARE:

        // Force the first declaration by returning that

        // the property is absent.

        state_ = DONT_DECLARE;

        return False();

      case DONT_DECLARE:

        // Ignore the second declaration by returning

        // that the property is already there.

        state_ = INITIALIZE;

        return True();

      case INITIALIZE:

        // Force an initialization by returning that

        // the property is absent. This will make sure

        // that the setter is called and it will not

        // lead to redeclaration conflicts (yet).

        state_ = UNKNOWN;

        return False();

      default:

        ASSERT(state_ == UNKNOWN);

        break;

    }

    // Do the lookup in the object.

    return v8::Local<Boolean>();

  }

 private:

  State state_;

};

TEST(Reappearing) {

  HandleScope scope;

  { ReappearingPropertyContext context;

    context.Check("const x; var x = 0",

                  0,

                  2,  // var declaration + const initialization

                  4,  // 2 x declaration + 2 x initialization

                  EXPECT_EXCEPTION);  // x has already been declared!

  }

}

class ExistsInPrototypeContext: public DeclarationContext {

 protected:

  virtual v8::Handle<Boolean> Has(Local<String> key) {

    // Let it seem that the property exists in the prototype object.

    return True();

  }

  // Use the prototype as the holder for the interceptors.

  virtual Local<ObjectTemplate> GetHolder(Local<FunctionTemplate> function) {

    return function->PrototypeTemplate();

  }

};

TEST(ExistsInPrototype) {

  HandleScope scope;

  // Sanity check to make sure that the holder of the interceptor

  // really is the prototype object.

  { ExistsInPrototypeContext context;

    context.Check("this.x = 87; this.x",

                  0,

                  0,

                  0,

                  EXPECT_RESULT, Number::New(87));

  }

  { ExistsInPrototypeContext context;

    context.Check("var x; x",

                  0,

                  0,

                  1,  // declaration

                  EXPECT_RESULT, Undefined());

  }

  { ExistsInPrototypeContext context;

    context.Check("var x = 0; x",

                  0,

                  0,

                  1,  // declaration

                  EXPECT_RESULT, Number::New(0));

  }

  { ExistsInPrototypeContext context;

    context.Check("const x; x",

                  0,

                  0,

                  1,  // declaration

                  EXPECT_RESULT, Undefined());

  }

  { ExistsInPrototypeContext context;

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

                  0,

                  0,

                  1,  // declaration

                  EXPECT_RESULT, Number::New(0));

  }

}

class AbsentInPrototypeContext: public DeclarationContext {

 protected:

  virtual v8::Handle<Boolean> Has(Local<String> key) {

    // Let it seem that the property is absent in the prototype object.

    return False();

  }

  // Use the prototype as the holder for the interceptors.

  virtual Local<ObjectTemplate> GetHolder(Local<FunctionTemplate> function) {

    return function->PrototypeTemplate();

  }

};

TEST(AbsentInPrototype) {

  HandleScope scope;

  { AbsentInPrototypeContext context;

    context.Check("if (false) { var x = 0; }; x",

                  0,

                  0,

                  1,  // declaration

                  EXPECT_RESULT, Undefined());

  }

}