jni/mac/gwt-webkit.cpp

/* 
 * Copyright 2007 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
#include "gwt-ll.h"
#include "DispWrapper.h"
#include "FuncWrapper.h"

JNIEnv* gEnv;
jclass gClass;
jclass gDispObjCls;
jclass gDispMethCls;
jmethodID gGetFieldMeth;
jmethodID gSetFieldMeth;
jmethodID gInvokeMeth;
jmethodID gToStringMeth;

using namespace KJS;

/*
 * Print a JSValue in human-readable form.
 * 
 * val JSValue* to print
 * prefix a string to print before the value
 */
void PrintJSValue(JSValue* val, char* prefix) {
  static const char* typeStrings[]={
    "unspecified",
    "number",
    "boolean",
    "undefined",
    "null",
    "string",
    "object",
    "getter/setter",
  };
  char buf[256];
  snprintf(buf, sizeof(buf), "%s{%08x}:", prefix, unsigned(val));
  TRACE(buf);
  JSType type = val->type();
  const char* typeString=typeStrings[type];
  char* p = buf;
  p += snprintf(p, sizeof(buf)-(p-buf), " %s: ", typeString);
  //p += snprintf(p, sizeof(buf)-(p-buf), "%s{%08x} %s: ", prefix, 
  //    unsigned(val), typeString);
  if (val->isNumber()) {
    p += snprintf(p, sizeof(buf)-(p-buf), "%lf", val->getNumber());
  } else if(val->isString()) {
    CString str(val->getString().UTF8String());
    p += snprintf(p, sizeof(buf)-(p-buf), "%.*s", (int)str.size(),
        str.c_str());
  } else if(val->isObject()) {
    const JSObject* obj = val->getObject();
    const ClassInfo* cinfo = obj->classInfo();
    const char* cname = cinfo ? cinfo->className : "js object";
    p += snprintf(p, sizeof(buf)-(p-buf), "%s @ %08x", cname, unsigned(obj));
  } else if(val->isBoolean()) {
    p += snprintf(p, sizeof(buf)-(p-buf), "%s", val->getBoolean() ? "true" : "false");
  }
  TRACE(buf);
}

/*
 * Called for each gcProtect, only if TRACING is enabled.
 * 
 * val JSValue* to be protected
 */
void gcProtectHook(JSValue* val) {
  PrintJSValue(val, "gcProtect: val=");
}

/*
 * Called for each gcUnprotect, only if TRACING is enabled.
 * 
 * val JSValue* to be protected
 * trace string containing trace information for the creation site, or null
 *     if not available
 */
void gcUnprotectHook(JSValue* val, const char* trace) {
  if (trace) {
    TRACE("gcUnprotect - value created at:");
    TRACE(trace);
  }
  PrintJSValue(val, "gcUnprotect: val=");
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    isNull
 * Signature: (I)Z
 */
JNIEXPORT jboolean JNICALL Java_com_google_gwt_dev_shell_mac_LowLevelSaf_isNull
    (JNIEnv *env, jclass, jint jsval)
{
  TRACE("ENTER LowLevelSaf__isNull");

  JSValue* val = (JSValue*)jsval;
  if (!val) {
    return JNI_FALSE;
  }

  TRACE("SUCCESS LowLevelSaf__isNull");
  return val->isNull();
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    isUndefined
 * Signature: (I)Z
 */
extern "C" JNIEXPORT jboolean JNICALL
Java_com_google_gwt_dev_shell_mac_LowLevelSaf_isUndefined
    (JNIEnv *env, jclass, jint jsval)
{
  TRACE("ENTER LowLevelSaf__isUndefined");
  JSValue* val = (JSValue*)jsval;
  if (!val) {
    return JNI_FALSE;
  }

  TRACE("SUCCESS LowLevelSaf__isUndefined");
  return val->isUndefined();
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    jsNull
 * Signature: ()I
 */
extern "C" JNIEXPORT jint JNICALL
Java_com_google_gwt_dev_shell_mac_LowLevelSaf_jsNull
    (JNIEnv *, jclass)
{
  return reinterpret_cast<jint>(jsNull());
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    getTypeString
 * Signature: (I)Ljava/lang/String;
 */
extern "C" JNIEXPORT jstring JNICALL
Java_com_google_gwt_dev_shell_mac_LowLevelSaf_getTypeString
    (JNIEnv *env, jclass, jint jsval)
{
  static const char* typeStrings[]={
    "unspecified",
    "number",
    "boolean",
    "undefined",
    "null",
    "string",
    "object",
    "getter/setter",
  };
  JSValue* val = (JSValue*)jsval;
  if (!val) {
    return 0;
  }
  JSType type = val->type();
  const char* typeString=typeStrings[type];
  if (type == ObjectType) {
    if (val->isObject(&DispWrapper::info)) {
       typeString = "Java object";
     } else {
       typeString = "JS object";
    }
  }
  return env->NewStringUTF(typeString);
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    jsUndefined
 * Signature: ()I
 */
JNIEXPORT jint JNICALL Java_com_google_gwt_dev_shell_mac_LowLevelSaf_jsUndefined
    (JNIEnv *env, jclass)
{
  return reinterpret_cast<jint>(jsUndefined());
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _coerceToBoolean
 * Signature: (II[Z)Z
 */
JNIEXPORT jboolean JNICALL
Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1coerceToBoolean
    (JNIEnv * env, jclass, jint execState, jint jsval, jbooleanArray rval)
{
  TRACE("ENTER LowLevelSaf__1coerceToBoolean");

  if (!execState || !jsval) {
    return JNI_FALSE;
  }

  jboolean result = ((JSValue*)jsval)->toBoolean((ExecState*)execState);
  env->SetBooleanArrayRegion(rval, 0, 1, &result);
  if (env->ExceptionCheck()) {
    return JNI_FALSE;
  }

  TRACE("SUCCESS LowLevelSaf__1coerceToBoolean");
  return JNI_TRUE;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _coerceToDouble
 * Signature: (II[D)Z
 */
JNIEXPORT jboolean JNICALL
Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1coerceToDouble
    (JNIEnv *env, jclass, jint execState, jint jsval, jdoubleArray rval)
{
  TRACE("ENTER LowLevelSaf__1coerceToDouble");

  if (!execState || !jsval) {
    return JNI_FALSE;
  }

  jdouble result = ((JSValue*)jsval)->toNumber((ExecState*)execState);
  env->SetDoubleArrayRegion(rval, 0, 1, &result);
  if (env->ExceptionCheck()) {
    return JNI_FALSE;
  }

  TRACE("SUCCESS LowLevelSaf__1coerceToDouble");
  return JNI_TRUE;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _coerceToString
 * Signature: (II[Ljava/lang/String;)Z
 */
JNIEXPORT jboolean JNICALL
Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1coerceToString
    (JNIEnv *env, jclass, jint execState, jint jsval, jobjectArray rval)
{
  TRACE("ENTER LowLevelSaf__1coerceToString");

  JSValue *val = (JSValue*)jsval;
  if (!execState || !val) {
    return JNI_FALSE;
  }

  /* 
   * Convert all objects to their string representation, EXCEPT
   * null and undefined which will be returned as a true NULL.
   */
  jstring result = NULL;
  if (!val->isNull() && !val->isUndefined()) {
    UString str = val->toString((ExecState*)execState);
    result = env->NewString((const jchar*)str.data(), str.size());
    if (env->ExceptionCheck())
      return JNI_FALSE;
  }

  env->SetObjectArrayElement(rval,0,result);
  if (env->ExceptionCheck()) {
    return JNI_FALSE;
  }

  TRACE("SUCCESS LowLevelSaf__1coerceToString");
  return JNI_TRUE;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _convertBoolean
 * Signature: (IZ[I)Z
 */
JNIEXPORT jboolean JNICALL
Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1convertBoolean
    (JNIEnv *env, jclass, jboolean jval, jintArray rval)
{
  TRACE("ENTER LowLevelSaf__1convertBoolean");
#ifdef ENABLE_TRACING
  char buf[256];
  snprintf(buf, sizeof(buf), " val=%s", jval ? "true" : "false");
  TRACE(buf);
#endif

  JSValue *jsval = (jval == JNI_FALSE) ? jsBoolean(false) : jsBoolean(true);

  /*
   * Since we know this is a boolean primitive, the protect is a no-op, but
   * it is useful to have it for the trace log.
   */
  gwtGCProtect(jsval);
  
  if (!jsval) {
    return JNI_FALSE;
  }

  env->SetIntArrayRegion(rval,0,1,(const jint*)&jsval);
  if (env->ExceptionCheck()) {
    return JNI_FALSE;
  }
  
  TRACE("SUCCESS LowLevelSaf__1convertBoolean");
  return JNI_TRUE;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _convertDouble
 * Signature: (ID[I)Z
 */
JNIEXPORT jboolean JNICALL Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1convertDouble
    (JNIEnv *env, jclass, jdouble jval, jintArray rval)
{
  TRACE("ENTER LowLevelSaf__1convertDouble");
#ifdef ENABLE_TRACING
  char buf[256];
  snprintf(buf, sizeof(buf), " val=%lf", jval);
  TRACE(buf);
#endif

  JSValue *jsval = jsNumber(jval);
  gwtGCProtect(jsval);
  if (!jsval) {
    return JNI_FALSE;
  }

  env->SetIntArrayRegion(rval,0,1,(const jint*)&jsval);
  if (env->ExceptionCheck()) {
    return JNI_FALSE;
  }

  TRACE("SUCCESS LowLevelSaf__1convertDouble");
  return JNI_TRUE;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _convertString
 * Signature: (ILjava/lang/String;[I)Z
 */
JNIEXPORT jboolean JNICALL Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1convertString
    (JNIEnv *env, jclass, jstring jval, jintArray rval)
{
  TRACE("ENTER LowLevelSaf__1convertString");

  JStringWrap jstr(env, jval);
  if (!jstr.jstr()) {
    return JNI_FALSE;
  }
#ifdef ENABLE_TRACING
  char buf[256];
  snprintf(buf, sizeof(buf), " val=%s", jstr.str());
  TRACE(buf);
#endif
  
  JSValue *jsval = jsString(UString((const UChar*)jstr.jstr(), jstr.length()));

  gwtGCProtect(jsval);
  if (!jsval) {
    return JNI_FALSE;
  }

  env->SetIntArrayRegion(rval,0,1,(const jint*)&jsval);
  if (env->ExceptionCheck()) {
    return JNI_FALSE;
  }

  TRACE("SUCCESS LowLevelSaf__1convertString");
  return JNI_TRUE;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _executeScript
 * Signature: (ILjava/lang/String;)Z
 */
JNIEXPORT jboolean JNICALL Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1executeScript
    (JNIEnv* env, jclass, jint execState, jstring code)
{
  TRACE("ENTER LowLevelSaf__1executeScript"); 
  if (!execState || !code) {
    return JNI_FALSE;
  }

  JStringWrap jcode(env, code);
  if (!jcode.jstr()) {
    return JNI_FALSE;
  }

#ifdef ENABLE_TRACING
  char buf[1024];
  snprintf(buf, sizeof(buf), " code=%s", jcode.str());
  TRACE(buf);
#endif
    
  Interpreter* interp = ((ExecState*)execState)->dynamicInterpreter();
  if (!interp) {
    return JNI_FALSE;
  }

  interp->evaluate(UString(), 0, (const UChar*)jcode.jstr(), jcode.length());
    TRACE("SUCCESS LowLevelSaf__1executeScript");
  return JNI_TRUE;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _executeScriptWithInfo
 * Signature: (ILjava/lang/String;Ljava/lang/String;I)Z
 */
JNIEXPORT jboolean JNICALL
Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1executeScriptWithInfo
    (JNIEnv* env, jclass, jint execState, jstring code, jstring file, jint line)
{
  TRACE("ENTER LowLevelSaf__1executeScriptWithInfo");
  if (!execState || !code || !file) {
    return JNI_FALSE;
  }

  JStringWrap jcode(env, code);
  if (!jcode.jstr()) {
    return JNI_FALSE;
  }

  JStringWrap jfile(env, file);
  if (!jcode.jstr()) {
    return JNI_FALSE;
  }

#ifdef ENABLE_TRACING
  char buf[1024];
  snprintf(buf, sizeof(buf), " code=%s, file=%s, line=%d", jcode.str(),
      jfile.str(), static_cast<int>(line));
  TRACE(buf);
#endif
  
  Interpreter* interp = ((ExecState*)execState)->dynamicInterpreter();
  if (!interp) {
    return JNI_FALSE;
  }

  interp->evaluate(UString((const UChar*)jfile.jstr(), jfile.length()), line,
      (const UChar*)jcode.jstr(), jcode.length());
  TRACE("SUCCESS LowLevelSaf__1executeScriptWithInfo");
  return JNI_TRUE;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _gcLock
 * Signature: (I)V
 */
JNIEXPORT void JNICALL Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1gcLock
    (JNIEnv *, jclass, jint jsval)
{
  gwtGCProtect(reinterpret_cast<JSValue*>(jsval));
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _gcUnlock
 * Signature: (ILjava/lang/String;)V
 */
JNIEXPORT void JNICALL Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1gcUnlock
    (JNIEnv* jniEnv, jclass, jint jsval, jstring creationDesc)
{
  JStringWrap creationStr(jniEnv, creationDesc);
  gwtGCUnprotect(reinterpret_cast<JSValue*>(jsval),
      creationDesc ? creationStr.str() : 0);
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _getGlobalExecState
 * Signature: (I[I)Z
 */
JNIEXPORT jboolean JNICALL
Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1getGlobalExecState
    (JNIEnv *env, jclass, jint scriptObject, jintArray rval)
{
  TRACE("ENTER LowLevelSaf__1getGlobalExecState");

  if (!scriptObject || !((JSValue*)scriptObject)->isObject()) {
    return JNI_FALSE;
  }

  Interpreter* interp
      = Interpreter::interpreterWithGlobalObject((JSObject*)scriptObject);
  if (!interp) {
    return JNI_FALSE;
  }

  ExecState* execState = interp->globalExec();
  env->SetIntArrayRegion(rval, 0, 1, (jint*)&execState);
  if (env->ExceptionCheck()) {
    return JNI_FALSE;
  }
  TRACE("SUCCESS LowLevelSaf__1getGlobalExecState");
  return JNI_TRUE;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _initNative
 * Signature: (Ljava/lang/Class;Ljava/lang/Class;)Z
 */
JNIEXPORT jboolean JNICALL
Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1initNative
    (JNIEnv* env, jclass llClass, jclass dispObjCls, jclass dispMethCls)
{
  Interpreter::setShouldPrintExceptions(true);
  gEnv = env;
  gClass =  static_cast<jclass>(env->NewGlobalRef(llClass));
  gDispObjCls = static_cast<jclass>(env->NewGlobalRef(dispObjCls));
  gDispMethCls = static_cast<jclass>(env->NewGlobalRef(dispMethCls));
  if (!gClass || !gDispObjCls || !gDispMethCls || env->ExceptionCheck()) {
    return false;
  }

  gGetFieldMeth
      = env->GetMethodID(gDispObjCls, "getField", "(Ljava/lang/String;)I");
  gSetFieldMeth
      = env->GetMethodID(gDispObjCls, "setField", "(Ljava/lang/String;I)V");
  gInvokeMeth = env->GetMethodID(gDispMethCls, "invoke", "(II[I)I");
  gToStringMeth
      = env->GetMethodID(gDispObjCls, "toString", "()Ljava/lang/String;");
  if (!gGetFieldMeth || !gSetFieldMeth || !gInvokeMeth || !gToStringMeth
      || env->ExceptionCheck())
  {
    return false;
  }

#ifdef FILETRACE
  gout = fopen("/tmp/gwt-ll.log", "w");
  filetrace("LOG STARTED");
#endif // FILETRACE

#ifdef JAVATRACE
  gTraceMethod = env->GetStaticMethodID(gClass, "trace", "(Ljava/lang/String;)V");
  if (!gTraceMethod || env->ExceptionCheck()) {
    return false;
  }
#endif // JAVATRACE

  return true;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _invoke
 * Signature: (IILjava/lang/String;II[I[I)Z
 */
JNIEXPORT jboolean JNICALL
Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1invoke
    (JNIEnv* env, jclass, jint jsexecState, jint jsScriptObject, jstring method,
    jint jsthis, jint argc, jintArray argv, jintArray rval)
{
  TRACE("ENTER LowLevelSaf__1invoke");

  if (!jsexecState || !jsScriptObject || !method || !rval) {
    return JNI_FALSE;
  }
  JStringWrap jmethod(env, method);
#ifdef ENABLE_TRACING
  char buf[256];
  snprintf(buf, sizeof(buf), "scriptObject=%08x, method=%s, argc=%d",
      static_cast<unsigned>(jsScriptObject), jmethod.str(),
      static_cast<unsigned>(argc));
  TRACE(buf);
  PrintJSValue((JSValue*)jsthis, " jsthis=");
#endif
  ExecState* execState = (ExecState*)jsexecState;

  JSObject* scriptObj = (JSObject*)jsScriptObject;
  if (!scriptObj->isObject()) {
    return JNI_FALSE;
  }

  if (!jmethod.jstr()) {
    return JNI_FALSE;
  }

  JSObject* thisObj = (JSObject*)jsthis;
  if (!thisObj || thisObj->isNull() || thisObj->isUndefined()) {
    thisObj = scriptObj;
  }
  if (!thisObj->isObject()) {
    return JNI_FALSE;
  }

  JSValue* maybeFunc = scriptObj->get(execState,
      Identifier((const UChar*)jmethod.jstr(), jmethod.length()));
  if (!maybeFunc || !maybeFunc->isObject()) {
    return JNI_FALSE;
  }
  
  JSObject* func = (JSObject*)maybeFunc;
  if (!func->implementsCall()) {
    return JNI_FALSE;
  }

  List args;
  for (int i = 0; i < argc; ++i) {
    jint argi;
    env->GetIntArrayRegion(argv, i, 1, &argi);
    if (env->ExceptionCheck()) {
      return JNI_FALSE;
    }
#ifdef ENABLE_TRACING
    snprintf(buf, sizeof(buf), " arg[%d]=", i);
    TRACE(buf);
    PrintJSValue((JSValue*)argi, buf);
#endif
    if (argi) {
      args.append((JSValue*)argi);
    } else {
      args.append(jsNull());
    }
  }

  JSValue* result = func->call(execState, thisObj, args);
  gwtGCProtect(result);
  env->SetIntArrayRegion(rval, 0, 1, (jint*)&result);
  if (env->ExceptionCheck()) {
    return JNI_FALSE;
  }

  TRACE("SUCCESS LowLevelSaf__1invoke");
  return JNI_TRUE;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    isBoolean
 * Signature: (I)Z
 */
extern "C" JNIEXPORT jboolean JNICALL
Java_com_google_gwt_dev_shell_mac_LowLevelSaf_isBoolean
    (JNIEnv *, jclass, jint jsval)
{
  if (!jsval) {
    return JNI_FALSE;
  }
  return reinterpret_cast<JSValue*>(jsval)->isBoolean() ? JNI_TRUE : JNI_FALSE;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    isNumber
 * Signature: (I)Z
 */
extern "C" JNIEXPORT jboolean JNICALL
Java_com_google_gwt_dev_shell_mac_LowLevelSaf_isNumber
    (JNIEnv *, jclass, jint jsval)
{
  if (!jsval) {
    return JNI_FALSE;
  }
  return reinterpret_cast<JSValue*>(jsval)->isNumber() ? JNI_TRUE : JNI_FALSE;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _isString
 * Signature: (I)Z
 * 
 * Must return true for JavaScript String objects as well as string primitives.
 */
JNIEXPORT jboolean JNICALL
Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1isString
    (JNIEnv *, jclass, jint jsval)
{
  if (!jsval) {
    return JNI_FALSE;
  }
  JSValue* jsValue = reinterpret_cast<JSValue*>(jsval);
  if(jsValue->isString()) return JNI_TRUE;
  // check for JavaScript String objects
  if(jsValue->isObject()) {
    const JSObject* obj = jsValue->getObject();
    const ClassInfo* cinfo = obj->classInfo();
    if (cinfo && !strcmp(cinfo->className, "String")) {
      return JNI_TRUE;
    }
  }
  return JNI_FALSE;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _isObject
 * Signature: (I)Z
 */
JNIEXPORT jboolean JNICALL Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1isObject
    (JNIEnv *, jclass, jint jsval)
{
  if (!jsval) {
    return JNI_FALSE;
  }
  return reinterpret_cast<JSValue*>(jsval)->isObject() ? JNI_TRUE : JNI_FALSE;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _isWrappedDispatch
 * Signature: (I[Z)Z
 */
JNIEXPORT jboolean JNICALL Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1isWrappedDispatch
    (JNIEnv* env, jclass, jint jsval, jbooleanArray rval)
{
  TRACE("ENTER LowLevelSaf__1isWrappedDispatch");
  if (!jsval) {
    return JNI_FALSE;
  }

  JSValue* val = (JSValue*)jsval;
  jboolean result = val->isObject(&DispWrapper::info) ? JNI_TRUE : JNI_FALSE;

  env->SetBooleanArrayRegion(rval, 0, 1, &result);
  if (env->ExceptionCheck()) {
    return JNI_FALSE;
  }

  TRACE("SUCCESS LowLevelSaf__1isWrappedDispatch");
  return JNI_TRUE;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _jsLock
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1jsLock
    (JNIEnv *, jclass)
{
  JSLock::lock();
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _jsUnlock
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1jsUnlock
    (JNIEnv *, jclass)
{
  JSLock::unlock();
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _raiseJavaScriptException
 * Signature: (II)Z
 */
JNIEXPORT jboolean JNICALL Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1raiseJavaScriptException
    (JNIEnv *env, jclass, jint execState, jint jsval)
{
  TRACE("ENTER LowLevelSaf__1raiseJavaScriptException");

  if (!execState || !jsval) {
    return JNI_FALSE;
  }

  reinterpret_cast<ExecState*>(execState)->setException(
      reinterpret_cast<JSValue*>(jsval));
  TRACE("SUCCESS LowLevelSaf__1raiseJavaScriptException");
  return JNI_TRUE;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _unwrapDispatch
 * Signature: (I[Lcom/google/gwt/dev/shell/mac/LowLevelSaf/DispatchObject;)Z
 */
JNIEXPORT jboolean JNICALL Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1unwrapDispatch
    (JNIEnv* env, jclass, jint jsval, jobjectArray rval)
{
  TRACE("ENTER LowLevelSaf__1unwrapDispatch");
  if (!jsval) {
    return JNI_FALSE;
  }

  JSValue* val = reinterpret_cast<JSValue*>(jsval);
  if (!val->isObject(&DispWrapper::info)) {
    return JNI_FALSE;
  }

  DispWrapper* wrapper = static_cast<DispWrapper*>(val);
  env->SetObjectArrayElement(rval, 0, wrapper->getDispObj());
  if (env->ExceptionCheck()) {
    return JNI_FALSE;
  }

  TRACE("SUCCESS LowLevelSaf__1unwrapDispatch");
  return JNI_TRUE;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _wrapDispatch
 * Signature: (Lcom/google/gwt/dev/shell/mac/LowLevelSaf/DispatchObject;[I)Z
 */
JNIEXPORT jboolean JNICALL
Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1wrapDispatch
    (JNIEnv* env, jclass, jobject dispObj, jintArray rval)
{
  TRACE("ENTER LowLevelSaf__1wrapDispatch");
  jobject dispObjRef = env->NewGlobalRef(dispObj);
  if (!dispObjRef || env->ExceptionCheck()) {
    return JNI_FALSE;
  }
  
  DispWrapper* wrapper = new DispWrapper(dispObjRef);

  gwtGCProtect(wrapper);

  env->SetIntArrayRegion(rval, 0, 1, (jint*)&wrapper);
  if (env->ExceptionCheck()) {
    return JNI_FALSE;
  }

  TRACE("SUCCESS LowLevelSaf__1wrapDispatch");
  return JNI_TRUE;
}

/*
 * Class:     com_google_gwt_dev_shell_mac_LowLevelSaf
 * Method:    _wrapFunction
 * Signature: (Ljava/lang/String;Lcom/google/gwt/dev/shell/mac/LowLevelSaf/DispatchMethod;[I)Z
 */
JNIEXPORT jboolean JNICALL
Java_com_google_gwt_dev_shell_mac_LowLevelSaf__1wrapFunction
    (JNIEnv* env, jclass, jstring name, jobject dispMeth, jintArray rval)
{
  TRACE("ENTER LowLevelSaf__1wrapFunction");

  jobject dispMethRef = env->NewGlobalRef(dispMeth);
  if (!dispMethRef || env->ExceptionCheck()) {
    return JNI_FALSE;
  }
  
  JStringWrap jname(env, name);
  if (!jname.jstr()) {
    return JNI_FALSE;
  }
  
  FuncWrapper* wrapper = new FuncWrapper(UString((const UChar*)jname.jstr(),
      jname.length()), dispMethRef);

  gwtGCProtect(wrapper);
  env->SetIntArrayRegion(rval, 0, 1, (jint*)&wrapper);
  if (env->ExceptionCheck()) {
    return JNI_FALSE;
  }

  TRACE("SUCCESS LowLevelSaf__1wrapFunction");
  return JNI_TRUE;
}

#ifdef FILETRACE
FILE* gout = 0;
void filetrace(const char* s) {
   fprintf(gout, s);
   fprintf(gout, "\n");
   fflush(gout);
}
#endif // FILETRACE

#ifdef JAVATRACE
jmethodID gTraceMethod = 0;
void javatrace(const char* s) {
   if (!gEnv->ExceptionCheck()) {
      jstring out = gEnv->NewStringUTF(s);
      if (!gEnv->ExceptionCheck()) {
        gEnv->CallStaticVoidMethod(gClass, gTraceMethod, out);
      } else {
        gEnv->ExceptionClear();
      }
   }
}
#endif // JAVATRACE