WebKit之binding分析案例（testInterface.idl）

## TestInterface.idl

// This IDL file is for testing the bindings code generator and for tracking
// changes in its ouput.
module test {
    interface [
        Conditional=Condition1|Condition2,
        CanBeConstructed,
        CallWith=ScriptExecutionContext
    ] TestInterface {
    };
}

## JSTestInterface.idl

#ifndef JSTestInterface_h
#define JSTestInterface_h

#if ENABLE(Condition1) || ENABLE(Condition2)

#include "JSDOMBinding.h"
#include <runtime/JSGlobalObject.h>
#include <runtime/JSObjectWithGlobalObject.h>
#include <runtime/ObjectPrototype.h>

namespace WebCore {

class TestInterface;

class JSTestInterface : public DOMObjectWithGlobalPointer {
    typedef DOMObjectWithGlobalPointer Base;
public:
    JSTestInterface(NonNullPassRefPtr<JSC::Structure>, JSDOMGlobalObject*, PassRefPtr<TestInterface>);
    static JSC::JSObject* createPrototype(JSC::ExecState*, JSC::JSGlobalObject*);
    virtual bool getOwnPropertySlot(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::PropertySlot&);
    virtual bool getOwnPropertyDescriptor(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::PropertyDescriptor&);
    static const JSC::ClassInfo s_info;

    static PassRefPtr<JSC::Structure> createStructure(JSC::JSGlobalData& globalData, JSC::JSValue prototype)
    {
        return JSC::Structure::create(globalData, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), AnonymousSlotCount, &s_info);
    }

    static JSC::JSValue getConstructor(JSC::ExecState*, JSC::JSGlobalObject*);
    TestInterface* impl() const { return m_impl.get(); }

private:
    RefPtr<TestInterface> m_impl;
protected:
    static const unsigned StructureFlags = JSC::OverridesGetOwnPropertySlot | Base::StructureFlags;
};

JSC::JSValue toJS(JSC::ExecState*, JSDOMGlobalObject*, TestInterface*);
TestInterface* toTestInterface(JSC::JSValue);

class JSTestInterfacePrototype : public JSC::JSObjectWithGlobalObject {
    typedef JSC::JSObjectWithGlobalObject Base;
public:
    static JSC::JSObject* self(JSC::ExecState*, JSC::JSGlobalObject*);
    static const JSC::ClassInfo s_info;
    static PassRefPtr<JSC::Structure> createStructure(JSC::JSGlobalData& globalData, JSC::JSValue prototype)
    {
        return JSC::Structure::create(globalData, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), AnonymousSlotCount, &s_info);
    }
    JSTestInterfacePrototype(JSC::JSGlobalObject* globalObject, NonNullPassRefPtr<JSC::Structure> structure) : JSC::JSObjectWithGlobalObject(globalObject, structure) { }
protected:
    static const unsigned StructureFlags = Base::StructureFlags;
};

// Attributes

JSC::JSValue jsTestInterfaceConstructor(JSC::ExecState*, JSC::JSValue, const JSC::Identifier&);

} // namespace WebCore

#endif // ENABLE(Condition1) || ENABLE(Condition2)

#endif

## JSTestInterface.cpp

#include "config.h"

#if ENABLE(Condition1) || ENABLE(Condition2)

#include "JSTestInterface.h"

#include "TestInterface.h"
#include <wtf/GetPtr.h>

using namespace JSC;

namespace WebCore {

ASSERT_CLASS_FITS_IN_CELL(JSTestInterface);

/* Hash table */
#if ENABLE(JIT)
#define THUNK_GENERATOR(generator) , generator
#else
#define THUNK_GENERATOR(generator)
#endif

static const HashTableValue JSTestInterfaceTableValues[2] =
{
    { "constructor", DontEnum | ReadOnly, (intptr_t)static_cast<PropertySlot::GetValueFunc>(jsTestInterfaceConstructor), (intptr_t)0 THUNK_GENERATOR(0) },
    { 0, 0, 0, 0 THUNK_GENERATOR(0) }
};

#undef THUNK_GENERATOR
static JSC_CONST_HASHTABLE HashTable JSTestInterfaceTable = { 2, 1, JSTestInterfaceTableValues, 0 };
/* Hash table for constructor */
#if ENABLE(JIT)
#define THUNK_GENERATOR(generator) , generator
#else
#define THUNK_GENERATOR(generator)
#endif

static const HashTableValue JSTestInterfaceConstructorTableValues[1] =
{
    { 0, 0, 0, 0 THUNK_GENERATOR(0) }
};

#undef THUNK_GENERATOR
static JSC_CONST_HASHTABLE HashTable JSTestInterfaceConstructorTable = { 1, 0, JSTestInterfaceConstructorTableValues, 0 };
class JSTestInterfaceConstructor : public DOMConstructorObject {
public:
    JSTestInterfaceConstructor(JSC::ExecState*, JSDOMGlobalObject*);

    virtual bool getOwnPropertySlot(JSC::ExecState*, const JSC::Identifier&, JSC::PropertySlot&);
    virtual bool getOwnPropertyDescriptor(JSC::ExecState*, const JSC::Identifier&, JSC::PropertyDescriptor&);
    static const JSC::ClassInfo s_info;
    static PassRefPtr<JSC::Structure> createStructure(JSC::JSGlobalData& globalData, JSC::JSValue prototype)
    {
        return JSC::Structure::create(globalData, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), AnonymousSlotCount, &s_info);
    }
protected:
    static const unsigned StructureFlags = JSC::OverridesGetOwnPropertySlot | JSC::ImplementsHasInstance | DOMConstructorObject::StructureFlags;
    static JSC::EncodedJSValue JSC_HOST_CALL constructJSTestInterface(JSC::ExecState*);
    virtual JSC::ConstructType getConstructData(JSC::ConstructData&);
};

const ClassInfo JSTestInterfaceConstructor::s_info = { "TestInterfaceConstructor", &DOMConstructorObject::s_info, &JSTestInterfaceConstructorTable, 0 };

JSTestInterfaceConstructor::JSTestInterfaceConstructor(ExecState* exec, JSDOMGlobalObject* globalObject)
    : DOMConstructorObject(JSTestInterfaceConstructor::createStructure(globalObject->globalData(), globalObject->objectPrototype()), globalObject)
{
    ASSERT(inherits(&s_info));
    putDirect(exec->globalData(), exec->propertyNames().prototype, JSTestInterfacePrototype::self(exec, globalObject), DontDelete | ReadOnly);
}

bool JSTestInterfaceConstructor::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
{
    return getStaticValueSlot<JSTestInterfaceConstructor, DOMObject>(exec, &JSTestInterfaceConstructorTable, this, propertyName, slot);
}

bool JSTestInterfaceConstructor::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
{
    return getStaticValueDescriptor<JSTestInterfaceConstructor, DOMObject>(exec, &JSTestInterfaceConstructorTable, this, propertyName, descriptor);
}

EncodedJSValue JSC_HOST_CALL JSTestInterfaceConstructor::constructJSTestInterface(ExecState* exec)
{
    ScriptExecutionContext* context = static_cast<JSTestInterfaceConstructor*>(exec->callee())->scriptExecutionContext();
    if (!context)
        return throwVMError(exec, createReferenceError(exec, "Reference error"));
    return JSValue::encode(asObject(toJS(exec, static_cast<JSTestInterfaceConstructor*>(exec->callee())->globalObject(), TestInterface::create(context))));
}

ConstructType JSTestInterfaceConstructor::getConstructData(ConstructData& constructData)
{
    constructData.native.function = constructJSTestInterface;
    return ConstructTypeHost;
}

/* Hash table for prototype */
#if ENABLE(JIT)
#define THUNK_GENERATOR(generator) , generator
#else
#define THUNK_GENERATOR(generator)
#endif

static const HashTableValue JSTestInterfacePrototypeTableValues[1] =
{
    { 0, 0, 0, 0 THUNK_GENERATOR(0) }
};

#undef THUNK_GENERATOR
static JSC_CONST_HASHTABLE HashTable JSTestInterfacePrototypeTable = { 1, 0, JSTestInterfacePrototypeTableValues, 0 };
const ClassInfo JSTestInterfacePrototype::s_info = { "TestInterfacePrototype", &JSC::JSObjectWithGlobalObject::s_info, &JSTestInterfacePrototypeTable, 0 };

JSObject* JSTestInterfacePrototype::self(ExecState* exec, JSGlobalObject* globalObject)
{
    return getDOMPrototype<JSTestInterface>(exec, globalObject);
}

const ClassInfo JSTestInterface::s_info = { "TestInterface", &DOMObjectWithGlobalPointer::s_info, &JSTestInterfaceTable, 0 };

JSTestInterface::JSTestInterface(NonNullPassRefPtr<Structure> structure, JSDOMGlobalObject* globalObject, PassRefPtr<TestInterface> impl)
    : DOMObjectWithGlobalPointer(structure, globalObject)
    , m_impl(impl)
{
    ASSERT(inherits(&s_info));
}

JSObject* JSTestInterface::createPrototype(ExecState* exec, JSGlobalObject* globalObject)
{
    return new (exec) JSTestInterfacePrototype(globalObject, JSTestInterfacePrototype::createStructure(globalObject->globalData(), globalObject->objectPrototype()));
}

bool JSTestInterface::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
{
    return getStaticValueSlot<JSTestInterface, Base>(exec, &JSTestInterfaceTable, this, propertyName, slot);
}

bool JSTestInterface::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
{
    return getStaticValueDescriptor<JSTestInterface, Base>(exec, &JSTestInterfaceTable, this, propertyName, descriptor);
}

JSValue jsTestInterfaceConstructor(ExecState* exec, JSValue slotBase, const Identifier&)
{
    JSTestInterface* domObject = static_cast<JSTestInterface*>(asObject(slotBase));
    return JSTestInterface::getConstructor(exec, domObject->globalObject());
}

JSValue JSTestInterface::getConstructor(ExecState* exec, JSGlobalObject* globalObject)
{
    return getDOMConstructor<JSTestInterfaceConstructor>(exec, static_cast<JSDOMGlobalObject*>(globalObject));
}

JSC::JSValue toJS(JSC::ExecState* exec, JSDOMGlobalObject* globalObject, TestInterface* object)
{
    return getDOMObjectWrapper<JSTestInterface>(exec, globalObject, object);
}
TestInterface* toTestInterface(JSC::JSValue value)
{
    return value.inherits(&JSTestInterface::s_info) ? static_cast<JSTestInterface*>(asObject(value))->impl() : 0;
}

}

#endif // ENABLE(Condition1) || ENABLE(Condition2)