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v8/test/cctest/test-decls.cc
rossberg@chromium.org ccc827a6f8 Allocate block-scoped global bindings to global context. 
- The global object has a reference to the current global scope chain.
  Running a script adds to the chain if it contains global lexical declarations.
- Scripts are executed relative to a global, not a native context.
- Harmony let and const bindings are allocated to the innermost global context;
  var and function still live on the global object.
  (Lexical bindings are not reflected on the global object at all,
  but that will probably change later using accessors, as for modules.)
- Compilation of scripts now needs a (global) context (previously only eval did).
- The global scope chain represents one logical scope, so collision tests take
  the chain into account.

R=svenpanne@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/10872084

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12398 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2012-08-28 11:25:08 +00:00

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// Copyright 2007-2008 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
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// 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
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <stdlib.h>
#include "v8.h"
#include "heap.h"
#include "cctest.h"
using namespace v8;
enum Expectations {
EXPECT_RESULT,
EXPECT_EXCEPTION,
EXPECT_ERROR
};
// 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 query_count() const { return query_count_; }
protected:
virtual v8::Handle<Value> Get(Local<String> key);
virtual v8::Handle<Value> Set(Local<String> key, Local<Value> value);
virtual v8::Handle<Integer> Query(Local<String> key);
void InitializeIfNeeded();
// Perform optional initialization steps on the context after it has
// been created. Defaults to none but may be overwritten.
virtual void PostInitializeContext(Handle<Context> context) {}
// 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<Integer> HandleQuery(Local<String> key,
const AccessorInfo& info);
private:
bool is_initialized_;
Persistent<Context> context_;
int get_count_;
int set_count_;
int query_count_;
static DeclarationContext* GetInstance(const AccessorInfo& info);
};
DeclarationContext::DeclarationContext()
: is_initialized_(false), get_count_(0), set_count_(0), query_count_(0) {
// Do nothing.
}
void DeclarationContext::InitializeIfNeeded() {
if (is_initialized_) return;
HandleScope scope;
Local<FunctionTemplate> function = FunctionTemplate::New();
Local<Value> data = External::New(this);
GetHolder(function)->SetNamedPropertyHandler(&HandleGet,
&HandleSet,
&HandleQuery,
0, 0,
data);
context_ = Context::New(0, function->InstanceTemplate(), Local<Value>());
context_->Enter();
is_initialized_ = true;
PostInitializeContext(context_);
}
void DeclarationContext::Check(const char* source,
int get, int set, int query,
Expectations expectations,
v8::Handle<Value> value) {
InitializeIfNeeded();
// A retry after a GC may pollute the counts, so perform gc now
// to avoid that.
HEAP->CollectGarbage(v8::internal::NEW_SPACE);
HandleScope scope;
TryCatch catcher;
catcher.SetVerbose(true);
Local<Script> script = Script::Compile(String::New(source));
if (expectations == EXPECT_ERROR) {
CHECK(script.IsEmpty());
return;
}
CHECK(!script.IsEmpty());
Local<Value> result = script->Run();
CHECK_EQ(get, get_count());
CHECK_EQ(set, set_count());
CHECK_EQ(query, query_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<Integer> DeclarationContext::HandleQuery(Local<String> key,
const AccessorInfo& info) {
DeclarationContext* context = GetInstance(info);
context->query_count_++;
return context->Query(key);
}
DeclarationContext* DeclarationContext::GetInstance(const AccessorInfo& info) {
return static_cast<DeclarationContext*>(External::Unwrap(info.Data()));
}
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<Integer> DeclarationContext::Query(Local<String> key) {
return v8::Handle<Integer>();
}
// 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
0,
0,
EXPECT_RESULT);
}
{ DeclarationContext context;
context.Check("const x; x",
1, // access
2, // declaration + initialization
1, // declaration
EXPECT_RESULT, Undefined());
}
{ DeclarationContext context;
context.Check("const x = 0; x",
1, // access
2, // declaration + initialization
1, // declaration
EXPECT_RESULT, Undefined()); // SB 0 - BUG 1213579
}
}
class PresentPropertyContext: public DeclarationContext {
protected:
virtual v8::Handle<Integer> Query(Local<String> key) {
return Integer::New(v8::None);
}
};
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
0,
0,
EXPECT_RESULT);
}
{ PresentPropertyContext context;
context.Check("const x; x",
1, // access
1, // initialization
1, // (re-)declaration
EXPECT_RESULT, Undefined());
}
{ PresentPropertyContext context;
context.Check("const x = 0; x",
1, // access
1, // initialization
1, // (re-)declaration
EXPECT_RESULT, Number::New(0));
}
}
class AbsentPropertyContext: public DeclarationContext {
protected:
virtual v8::Handle<Integer> Query(Local<String> key) {
return v8::Handle<Integer>();
}
};
TEST(Absent) {
HandleScope scope;
{ AbsentPropertyContext context;
context.Check("var x; x",
1, // access
1, // declaration
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
0,
0,
EXPECT_RESULT);
}
{ AbsentPropertyContext context;
context.Check("const x; x",
1, // access
2, // declaration + initialization
1, // declaration
EXPECT_RESULT, Undefined());
}
{ AbsentPropertyContext context;
context.Check("const x = 0; x",
1, // access
2, // declaration + initialization
1, // declaration
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<Integer> Query(Local<String> key) {
switch (state_) {
case DECLARE:
// Force declaration by returning that the
// property is absent.
state_ = INITIALIZE_IF_ASSIGN;
return Handle<Integer>();
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 Integer::New(v8::None);
default:
CHECK(state_ == UNKNOWN);
break;
}
// Do the lookup in the object.
return v8::Handle<Integer>();
}
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
0,
0,
EXPECT_RESULT);
}
{ AppearingPropertyContext context;
context.Check("const x; x",
1, // access
2, // declaration + initialization
1, // declaration
EXPECT_RESULT, Undefined());
}
{ AppearingPropertyContext context;
context.Check("const x = 0; x",
1, // access
2, // declaration + initialization
1, // declaration
EXPECT_RESULT, Undefined());
// Result is undefined because declaration succeeded but
// initialization to 0 failed (due to context behavior).
}
}
class ReappearingPropertyContext: public DeclarationContext {
public:
enum State {
DECLARE,
DONT_DECLARE,
INITIALIZE,
UNKNOWN
};
ReappearingPropertyContext() : state_(DECLARE) { }
protected:
virtual v8::Handle<Integer> Query(Local<String> key) {
switch (state_) {
case DECLARE:
// Force the first declaration by returning that
// the property is absent.
state_ = DONT_DECLARE;
return Handle<Integer>();
case DONT_DECLARE:
// Ignore the second declaration by returning
// that the property is already there.
state_ = INITIALIZE;
return Integer::New(v8::None);
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 Handle<Integer>();
default:
CHECK(state_ == UNKNOWN);
break;
}
// Do the lookup in the object.
return Handle<Integer>();
}
private:
State state_;
};
TEST(Reappearing) {
HandleScope scope;
{ ReappearingPropertyContext context;
context.Check("const x; var x = 0",
0,
3, // const declaration+initialization, var initialization
3, // 2 x declaration + var initialization
EXPECT_RESULT, Undefined());
}
}
class ExistsInPrototypeContext: public DeclarationContext {
protected:
virtual v8::Handle<Integer> Query(Local<String> key) {
// Let it seem that the property exists in the prototype object.
return Integer::New(v8::None);
}
// Use the prototype as the holder for the interceptors.
virtual Local<ObjectTemplate> GetHolder(Local<FunctionTemplate> function) {
return function->PrototypeTemplate();
}
};
TEST(ExistsInPrototype) {
i::FLAG_es52_globals = true;
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,
0,
EXPECT_RESULT, Undefined());
}
{ ExistsInPrototypeContext context;
context.Check("var x = 0; x",
0,
0,
0,
EXPECT_RESULT, Number::New(0));
}
{ ExistsInPrototypeContext context;
context.Check("const x; x",
0,
0,
0,
EXPECT_RESULT, Undefined());
}
{ ExistsInPrototypeContext context;
context.Check("const x = 0; x",
0,
0,
0,
EXPECT_RESULT, Number::New(0));
}
}
class AbsentInPrototypeContext: public DeclarationContext {
protected:
virtual v8::Handle<Integer> Query(Local<String> key) {
// Let it seem that the property is absent in the prototype object.
return Handle<Integer>();
}
// Use the prototype as the holder for the interceptors.
virtual Local<ObjectTemplate> GetHolder(Local<FunctionTemplate> function) {
return function->PrototypeTemplate();
}
};
TEST(AbsentInPrototype) {
i::FLAG_es52_globals = true;
HandleScope scope;
{ AbsentInPrototypeContext context;
context.Check("if (false) { var x = 0; }; x",
0,
0,
0,
EXPECT_RESULT, Undefined());
}
}
class ExistsInHiddenPrototypeContext: public DeclarationContext {
public:
ExistsInHiddenPrototypeContext() {
hidden_proto_ = FunctionTemplate::New();
hidden_proto_->SetHiddenPrototype(true);
}
protected:
virtual v8::Handle<Integer> Query(Local<String> key) {
// Let it seem that the property exists in the hidden prototype object.
return Integer::New(v8::None);
}
// Install the hidden prototype after the global object has been created.
virtual void PostInitializeContext(Handle<Context> context) {
Local<Object> global_object = context->Global();
Local<Object> hidden_proto = hidden_proto_->GetFunction()->NewInstance();
context->DetachGlobal();
context->Global()->SetPrototype(hidden_proto);
context->ReattachGlobal(global_object);
}
// Use the hidden prototype as the holder for the interceptors.
virtual Local<ObjectTemplate> GetHolder(Local<FunctionTemplate> function) {
return hidden_proto_->InstanceTemplate();
}
private:
Local<FunctionTemplate> hidden_proto_;
};
TEST(ExistsInHiddenPrototype) {
i::FLAG_es52_globals = true;
HandleScope scope;
{ ExistsInHiddenPrototypeContext context;
context.Check("var x; x",
1, // access
0,
2, // declaration + initialization
EXPECT_EXCEPTION); // x is not defined!
}
{ ExistsInHiddenPrototypeContext context;
context.Check("var x = 0; x",
1, // access
1, // initialization
2, // declaration + initialization
EXPECT_RESULT, Number::New(0));
}
{ ExistsInHiddenPrototypeContext context;
context.Check("function x() { }; x",
0,
0,
0,
EXPECT_RESULT);
}
// TODO(mstarzinger): The semantics of global const is vague.
{ ExistsInHiddenPrototypeContext context;
context.Check("const x; x",
0,
0,
1, // (re-)declaration
EXPECT_RESULT, Undefined());
}
// TODO(mstarzinger): The semantics of global const is vague.
{ ExistsInHiddenPrototypeContext context;
context.Check("const x = 0; x",
0,
0,
1, // (re-)declaration
EXPECT_RESULT, Number::New(0));
}
}
class SimpleContext {
public:
SimpleContext() {
context_ = Context::New(0);
context_->Enter();
}
virtual ~SimpleContext() {
context_->Exit();
context_.Dispose();
}
void Check(const char* source,
Expectations expectations,
v8::Handle<Value> value = Local<Value>()) {
HandleScope scope;
TryCatch catcher;
catcher.SetVerbose(true);
Local<Script> script = Script::Compile(String::New(source));
if (expectations == EXPECT_ERROR) {
CHECK(script.IsEmpty());
return;
}
CHECK(!script.IsEmpty());
Local<Value> result = script->Run();
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());
}
}
}
private:
Persistent<Context> context_;
};
TEST(MultiScriptConflicts) {
HandleScope scope;
{ SimpleContext context;
context.Check("var x = 1; x",
EXPECT_RESULT, Number::New(1));
context.Check("var x = 2; x",
EXPECT_RESULT, Number::New(2));
context.Check("const x = 3; x",
EXPECT_RESULT, Number::New(3));
context.Check("const x = 4; x",
EXPECT_RESULT, Number::New(4));
context.Check("x = 5; x",
EXPECT_RESULT, Number::New(5));
context.Check("var x = 6; x",
EXPECT_RESULT, Number::New(6));
context.Check("this.x",
EXPECT_RESULT, Number::New(6));
context.Check("function x() { return 7 }; x()",
EXPECT_RESULT, Number::New(7));
}
{ SimpleContext context;
context.Check("const x = 1; x",
EXPECT_RESULT, Number::New(1));
context.Check("var x = 2; x", // assignment ignored
EXPECT_RESULT, Number::New(1));
context.Check("const x = 3; x",
EXPECT_RESULT, Number::New(1));
context.Check("x = 4; x", // assignment ignored
EXPECT_RESULT, Number::New(1));
context.Check("var x = 5; x", // assignment ignored
EXPECT_RESULT, Number::New(1));
context.Check("this.x",
EXPECT_RESULT, Number::New(1));
context.Check("function x() { return 7 }; x",
EXPECT_EXCEPTION);
}
i::FLAG_use_strict = true;
i::FLAG_harmony_scoping = true;
{ SimpleContext context;
context.Check("var x = 1; x",
EXPECT_RESULT, Number::New(1));
context.Check("x",
EXPECT_RESULT, Number::New(1));
context.Check("this.x",
EXPECT_RESULT, Number::New(1));
}
{ SimpleContext context;
context.Check("function x() { return 4 }; x()",
EXPECT_RESULT, Number::New(4));
context.Check("x()",
EXPECT_RESULT, Number::New(4));
context.Check("this.x()",
EXPECT_RESULT, Number::New(4));
}
{ SimpleContext context;
context.Check("let x = 2; x",
EXPECT_RESULT, Number::New(2));
context.Check("x",
EXPECT_RESULT, Number::New(2));
// TODO(rossberg): The current ES6 draft spec does not reflect lexical
// bindings on the global object. However, this will probably change, in
// which case we reactivate the following test.
// context.Check("this.x",
// EXPECT_RESULT, Number::New(2));
}
{ SimpleContext context;
context.Check("const x = 3; x",
EXPECT_RESULT, Number::New(3));
context.Check("x",
EXPECT_RESULT, Number::New(3));
// TODO(rossberg): The current ES6 draft spec does not reflect lexical
// bindings on the global object. However, this will probably change, in
// which case we reactivate the following test.
// context.Check("this.x",
// EXPECT_RESULT, Number::New(3));
}
// TODO(rossberg): All of the below should actually be errors in Harmony.
{ SimpleContext context;
context.Check("var x = 1; x",
EXPECT_RESULT, Number::New(1));
context.Check("let x = 2; x",
EXPECT_RESULT, Number::New(2));
}
{ SimpleContext context;
context.Check("var x = 1; x",
EXPECT_RESULT, Number::New(1));
context.Check("const x = 2; x",
EXPECT_RESULT, Number::New(2));
}
{ SimpleContext context;
context.Check("function x() { return 1 }; x()",
EXPECT_RESULT, Number::New(1));
context.Check("let x = 2; x",
EXPECT_RESULT, Number::New(2));
}
{ SimpleContext context;
context.Check("function x() { return 1 }; x()",
EXPECT_RESULT, Number::New(1));
context.Check("const x = 2; x",
EXPECT_RESULT, Number::New(2));
}
{ SimpleContext context;
context.Check("let x = 1; x",
EXPECT_RESULT, Number::New(1));
context.Check("var x = 2; x",
EXPECT_ERROR);
}
{ SimpleContext context;
context.Check("let x = 1; x",
EXPECT_RESULT, Number::New(1));
context.Check("let x = 2; x",
EXPECT_ERROR);
}
{ SimpleContext context;
context.Check("let x = 1; x",
EXPECT_RESULT, Number::New(1));
context.Check("const x = 2; x",
EXPECT_ERROR);
}
{ SimpleContext context;
context.Check("let x = 1; x",
EXPECT_RESULT, Number::New(1));
context.Check("function x() { return 2 }; x()",
EXPECT_ERROR);
}
{ SimpleContext context;
context.Check("const x = 1; x",
EXPECT_RESULT, Number::New(1));
context.Check("var x = 2; x",
EXPECT_ERROR);
}
{ SimpleContext context;
context.Check("const x = 1; x",
EXPECT_RESULT, Number::New(1));
context.Check("let x = 2; x",
EXPECT_ERROR);
}
{ SimpleContext context;
context.Check("const x = 1; x",
EXPECT_RESULT, Number::New(1));
context.Check("const x = 2; x",
EXPECT_ERROR);
}
{ SimpleContext context;
context.Check("const x = 1; x",
EXPECT_RESULT, Number::New(1));
context.Check("function x() { return 2 }; x()",
EXPECT_ERROR);
}
}
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