jni_runtime.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2003 Apple Computer, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 "config.h"
#include <jni_runtime.h>

#if ENABLE(MAC_JAVA_BRIDGE)

#include <jni_utility.h>

#include "runtime_array.h"
#include "runtime_object.h"
#include "runtime_root.h"
#include <runtime/Error.h>
#include <runtime/JSLock.h>

#ifdef NDEBUG
#define JS_LOG(formatAndArgs...) ((void)0)
#else
#define JS_LOG(formatAndArgs...) { \
    fprintf (stderr, "%s:%d -- %s:  ", __FILE__, __LINE__, __FUNCTION__); \
    fprintf(stderr, formatAndArgs); \
}
#endif

using namespace JSC;
using namespace JSC::Bindings;


JavaParameter::JavaParameter (JNIEnv *env, jstring type)
{
    _type = JavaString (env, type);
    _JNIType = JNITypeFromClassName (_type.UTF8String());
}

JavaField::JavaField (JNIEnv *env, jobject aField)
{
    // Get field type
    jobject fieldType = callJNIMethod<jobject>(aField, "getType", "()Ljava/lang/Class;");
    jstring fieldTypeName = (jstring)callJNIMethod<jobject>(fieldType, "getName", "()Ljava/lang/String;");
    _type = JavaString(env, fieldTypeName);
    _JNIType = JNITypeFromClassName (_type.UTF8String());

    // Get field name
    jstring fieldName = (jstring)callJNIMethod<jobject>(aField, "getName", "()Ljava/lang/String;");
    _name = JavaString(env, fieldName);

    _field = new JObjectWrapper(aField);
}

JSValuePtr JavaArray::convertJObjectToArray(ExecState* exec, jobject anObject, const char* type, PassRefPtr<RootObject> rootObject)
{
    if (type[0] != '[')
        return jsUndefined();

    return new (exec) RuntimeArray(exec, new JavaArray((jobject)anObject, type, rootObject));
}

jvalue JavaField::dispatchValueFromInstance(ExecState *exec, const JavaInstance *instance, const char *name, const char *sig, JNIType returnType) const
{
    jobject jinstance = instance->javaInstance();
    jobject fieldJInstance = _field->_instance;
    JNIEnv *env = getJNIEnv();
    jvalue result;

    bzero (&result, sizeof(jvalue));
    jclass cls = env->GetObjectClass(fieldJInstance);
    if ( cls != NULL ) {
        jmethodID mid = env->GetMethodID(cls, name, sig);
        if ( mid != NULL )
        {
            RootObject* rootObject = instance->rootObject();
            if (rootObject && rootObject->nativeHandle()) {
                JSValuePtr exceptionDescription = noValue();
                jvalue args[1];
                
                args[0].l = jinstance;
                dispatchJNICall(exec, rootObject->nativeHandle(), fieldJInstance, false, returnType, mid, args, result, 0, exceptionDescription);
                if (exceptionDescription)
                    throwError(exec, GeneralError, exceptionDescription.toString(exec));
            }
        }
    }
    return result;
}

JSValuePtr JavaField::valueFromInstance(ExecState* exec, const Instance* i) const 
{
    const JavaInstance *instance = static_cast<const JavaInstance *>(i);

    JSValuePtr jsresult = jsUndefined();
    
    switch (_JNIType) {
        case array_type:
        case object_type: {
            jvalue result = dispatchValueFromInstance (exec, instance, "get", "(Ljava/lang/Object;)Ljava/lang/Object;", object_type);
            jobject anObject = result.l;

            const char *arrayType = type();
            if (arrayType[0] == '[') {
                jsresult = JavaArray::convertJObjectToArray(exec, anObject, arrayType, instance->rootObject());
            }
            else if (anObject != 0){
                jsresult = JavaInstance::create(anObject, instance->rootObject())->createRuntimeObject(exec);
            }
        }
        break;
            
        case boolean_type:
            jsresult = jsBoolean(dispatchValueFromInstance(exec, instance, "getBoolean", "(Ljava/lang/Object;)Z", boolean_type).z);
            break;
            
        case byte_type:
        case char_type:
        case short_type:
        
        case int_type: {
            jint value;
            jvalue result = dispatchValueFromInstance (exec, instance, "getInt", "(Ljava/lang/Object;)I", int_type);
            value = result.i;
            jsresult = jsNumber(exec, (int)value);
        }
        break;

        case long_type:
        case float_type:
        case double_type: {
            jdouble value;
            jvalue result = dispatchValueFromInstance (exec, instance, "getDouble", "(Ljava/lang/Object;)D", double_type);
            value = result.i;
            jsresult = jsNumber(exec, (double)value);
        }
        break;
        default:
        break;
    }

    JS_LOG ("getting %s = %s\n", UString(name()).UTF8String().c_str(), jsresult.toString(exec).ascii());
    
    return jsresult;
}

void JavaField::dispatchSetValueToInstance(ExecState *exec, const JavaInstance *instance, jvalue javaValue, const char *name, const char *sig) const
{
    jobject jinstance = instance->javaInstance();
    jobject fieldJInstance = _field->_instance;
    JNIEnv *env = getJNIEnv();

    jclass cls = env->GetObjectClass(fieldJInstance);
    if ( cls != NULL ) {
        jmethodID mid = env->GetMethodID(cls, name, sig);
        if ( mid != NULL )
        {
            RootObject* rootObject = instance->rootObject();
            if (rootObject && rootObject->nativeHandle()) {
                JSValuePtr exceptionDescription = noValue();
                jvalue args[2];
                jvalue result;
                
                args[0].l = jinstance;
                args[1] = javaValue;
                dispatchJNICall(exec, rootObject->nativeHandle(), fieldJInstance, false, void_type, mid, args, result, 0, exceptionDescription);
                if (exceptionDescription)
                    throwError(exec, GeneralError, exceptionDescription.toString(exec));
            }
        }
    }
}

void JavaField::setValueToInstance(ExecState* exec, const Instance* i, JSValuePtr aValue) const
{
    const JavaInstance *instance = static_cast<const JavaInstance *>(i);
    jvalue javaValue = convertValueToJValue (exec, aValue, _JNIType, type());

    JS_LOG ("setting value %s to %s\n", UString(name()).UTF8String().c_str(), aValue.toString(exec).ascii());

    switch (_JNIType) {
        case array_type:
        case object_type: {
            dispatchSetValueToInstance (exec, instance, javaValue, "set", "(Ljava/lang/Object;Ljava/lang/Object;)V");
        }
        break;
            
        case boolean_type: {
            dispatchSetValueToInstance (exec, instance, javaValue, "setBoolean", "(Ljava/lang/Object;Z)V");
        }
        break;
            
        case byte_type: {
            dispatchSetValueToInstance (exec, instance, javaValue, "setByte", "(Ljava/lang/Object;B)V");
        }
        break;

        case char_type: {
            dispatchSetValueToInstance (exec, instance, javaValue, "setChar", "(Ljava/lang/Object;C)V");
        }
        break;

        case short_type: {
            dispatchSetValueToInstance (exec, instance, javaValue, "setShort", "(Ljava/lang/Object;S)V");
        }
        break;

        case int_type: {
            dispatchSetValueToInstance (exec, instance, javaValue, "setInt", "(Ljava/lang/Object;I)V");
        }
        break;

        case long_type: {
            dispatchSetValueToInstance (exec, instance, javaValue, "setLong", "(Ljava/lang/Object;J)V");
        }
        break;

        case float_type: {
            dispatchSetValueToInstance (exec, instance, javaValue, "setFloat", "(Ljava/lang/Object;F)V");
        }
        break;

        case double_type: {
            dispatchSetValueToInstance (exec, instance, javaValue, "setDouble", "(Ljava/lang/Object;D)V");
        }
        break;
        default:
        break;
    }
}

JavaMethod::JavaMethod (JNIEnv *env, jobject aMethod)
{
    // Get return type
    jobject returnType = callJNIMethod<jobject>(aMethod, "getReturnType", "()Ljava/lang/Class;");
    jstring returnTypeName = (jstring)callJNIMethod<jobject>(returnType, "getName", "()Ljava/lang/String;");
    _returnType =JavaString (env, returnTypeName);
    _JNIReturnType = JNITypeFromClassName (_returnType.UTF8String());
    env->DeleteLocalRef (returnType);
    env->DeleteLocalRef (returnTypeName);

    // Get method name
    jstring methodName = (jstring)callJNIMethod<jobject>(aMethod, "getName", "()Ljava/lang/String;");
    _name = JavaString (env, methodName);
    env->DeleteLocalRef (methodName);

    // Get parameters
    jarray jparameters = (jarray)callJNIMethod<jobject>(aMethod, "getParameterTypes", "()[Ljava/lang/Class;");
    _numParameters = env->GetArrayLength (jparameters);
    _parameters = new JavaParameter[_numParameters];
    
    int i;
    for (i = 0; i < _numParameters; i++) {
        jobject aParameter = env->GetObjectArrayElement ((jobjectArray)jparameters, i);
        jstring parameterName = (jstring)callJNIMethod<jobject>(aParameter, "getName", "()Ljava/lang/String;");
        _parameters[i] = JavaParameter(env, parameterName);