func jBoolValue(v interface{}) (C.jvalue, error) {
val, ok := v.(bool)
if !ok {
return errJValue, fmt.Errorf("%#v isn't bool", v)
}
jBool := C.jboolean(C.JNI_FALSE)
if val {
jBool = C.jboolean(C.JNI_TRUE)
}
return C.jBoolValue(jBool), nil
}
func (self *Environment) ToIntArray(arrayObj *Object) (array []int) {
alen := C.envGetArrayLength(self.env, arrayObj.object)
_false := C.jboolean(C.JNI_FALSE)
ptr := C.envGetIntArrayElements(self.env, arrayObj.object, &_false)
defer C.envReleaseIntArrayElements(self.env, arrayObj.object, ptr, 0)
bytes := C.GoBytes(unsafe.Pointer(ptr), C.int(alen)*4)
array = (*(*[1024 * 1024]int)(unsafe.Pointer(&bytes)))[0:int(alen)]
return
}
func (self *Environment) ToString(strobj *Object) (str string, isNull bool, err error) {
var bytesObj *Object
bytesObj, err = self.CallObjectObj(strobj, false, "getBytes", types.Array{types.Basic(types.ByteKind)}, self.utf8())
if err == nil && bytesObj == nil {
isNull = true
return
}
if err == nil {
defer self.DeleteLocalRef(bytesObj)
alen := C.envGetArrayLength(self.env, bytesObj.object)
_false := C.jboolean(C.JNI_FALSE)
ptr := C.envGetByteArrayElements(self.env, bytesObj.object, &_false)
defer C.envReleaseByteArrayElements(self.env, bytesObj.object, ptr, 0)
str = string(C.GoBytes(unsafe.Pointer(ptr), C.int(alen)))
}
return
}
func (self *Environment) setBoolField(z interface{}, static bool, name string, gval bool) (err error) {
jval, field, err := self.getField(z, static, name, types.Basic(types.BoolKind))
if err != nil {
return
}
val := C.jboolean(C.JNI_FALSE)
if gval {
val = C.JNI_TRUE
}
if static {
C.envSetStaticBooleanField(self.env, C.valObject(jval), field.field, val)
} else {
C.envSetBooleanField(self.env, C.valObject(jval), field.field, val)
}
if self.ExceptionCheck() {
err = self.ExceptionOccurred()
}
return
}
// C callbacks actually start in the 'generifiedX' calls (see the .c files)
// Next, goCallbackNArgs is used to determine the number of variadic paramers to expect (
// java doesn't inform us of this, and we can't force any of the callback parameters.
//
// Finally, goCallback looks up the 'fId' - our internal function reference ID (the X in generified),
// un(re) marshalls all the parameters appropriately, calls our function, and returns
// any underlying value back to generified who will return it to the JVM.
// The initial jbool indicates success, and any failure should check for exceptions.
//
//export goCallback
func goCallback(envp, obj uintptr, fId int, nargs int, argp uintptr) (ok C.jboolean, val interface{}) {
args := C.ArgListPtr(unsafe.Pointer(argp))
env := AllEnvs.Find(envp)
if env == nil {
panic("Got a nil environment")
}
if env.jvm == nil {
panic("Environment pointer has no JVM")
}
var cd callbackDescriptor
var _ok bool
if cd, _ok = env.jvm.registered[fId]; !_ok {
print("Unknown callbackId: \t", fId, "\n")
return
}
// TODO: pack argp somehow...
if nargs != len(cd.Signature.Params) {
panic("callback/signature length mismatch")
}
inCall := []reflect.Value{reflect.ValueOf(env), reflect.ValueOf(newObject(C.jobject(unsafe.Pointer(obj))))}
var err error
for i := 0; i < nargs; i++ {
switch cd.Signature.Params[i].Kind() {
case types.BoolKind:
inCall = append(inCall, reflect.ValueOf(bool(0 != C.valBool(C.getArg(args, C.int(i))))))
case types.LongKind:
inCall = append(inCall, reflect.ValueOf(int64(C.valLong(C.getArg(args, C.int(i))))))
case types.IntKind:
inCall = append(inCall, reflect.ValueOf(int(C.valInt(C.getArg(args, C.int(i))))))
case types.ShortKind:
inCall = append(inCall, reflect.ValueOf(int16(C.valShort(C.getArg(args, C.int(i))))))
case types.FloatKind:
inCall = append(inCall, reflect.ValueOf(float32(C.valFloat(C.getArg(args, C.int(i))))))
case types.DoubleKind:
inCall = append(inCall, reflect.ValueOf(float64(C.valDouble(C.getArg(args, C.int(i))))))
case types.ClassKind:
inCall = append(inCall, reflect.ValueOf(newObject(C.valObject(C.getArg(args, C.int(i))))))
default:
err = errors.New("Couldn't reflect kind " + cd.Signature.Params[i].Kind().TypeString())
}
if err != nil {
break
}
}
if err != nil {
return
}
outCall := reflect.ValueOf(cd.F).Call(inCall)
switch cd.Signature.Return.Kind() {
case types.VoidKind:
return 1, nil
}
switch cd.Signature.Return.Kind() {
case types.BoolKind:
if outCall[0].Interface().(bool) {
return 1, C.jboolean(C.JNI_TRUE)
} else {
return 1, C.jboolean(C.JNI_FALSE)
}
case types.ByteKind:
return 1, C.jbyte(outCall[0].Interface().(byte))
case types.CharKind:
return 1, C.jchar(outCall[0].Interface().(int))
case types.IntKind:
return 1, C.jint(outCall[0].Interface().(int))
case types.ShortKind:
return 1, C.jshort(outCall[0].Interface().(int16))
case types.LongKind:
return 1, C.jint(outCall[0].Interface().(int64))
case types.FloatKind:
return 1, C.jfloat(outCall[0].Interface().(float32))
case types.DoubleKind:
return 1, C.jdouble(outCall[0].Interface().(float64))
case types.ClassKind:
klass := cd.Signature.Return.(types.Class).Klass
if klass.Cmp(types.JavaLangString) == 0 {
var obj *Object
str := outCall[0].Interface().(string)
obj, err = env.NewStringObject(str)
if err == nil {
return 1, C.jstring(obj.object)
} // else, exception occurred
// not needed as callbacks will reap their own refs.
// env.DeleteLocalRef(obj)
print("String Error\t", err.Error())
return 0, nil
}
return 1, C.jobject(outCall[0].Interface().(*Object).object)
default:
panic("array return type not yet supported")
}
panic("not reached")
}
// TODO(refcounting): any constructed objects will be leaked on call return,
// as nothing cleans up proxy objects. I'm also torn on how to differentiate
// the objects made here and those coming in from other references.
//
// Refcounting attempt 1, objects _we_ construct will be returned in the objStack,
// otherwise refcounts of 'pass-through' java natives are untouched by the call to newArgList.
//
// On error, the stack has already been blown (and will be empty).
func newArgList(ctx *Environment, params ...interface{}) (alp argList, objStack []*Object, err error) {
alp = make(argList, 0)
defer func() {
if err != nil {
blowStack(ctx, objStack)
objStack = []*Object{}
}
}()
for i, param := range params {
var ok C.int
switch v := param.(type) {
case int:
alp = append(alp, C.intValue(C.jint(v)))
case int64:
alp = append(alp, C.longValue(C.jlong(v)))
case C.jstring:
alp = append(alp, C.objValue(v))
case C.jboolean:
alp = append(alp, C.boolValue(v))
case C.jint:
alp = append(alp, C.intValue(v))
case C.jobject:
alp = append(alp, C.objValue(v))
case *Object:
alp = append(alp, C.objValue(v.object))
case *Class:
alp = append(alp, C.objValue(v.class))
case C.jvalue:
alp = append(alp, v)
case string:
var str *Object
str, err = ctx.NewStringObject(v)
if err == nil {
objStack = append(objStack, str)
alp = append(alp, C.objValue(str.object))
}
case []string:
var klass *Class
var obj *Object
klass, err = ctx.GetClassStr("java/lang/String")
// classes via this channel are cached and globally referenced by gojvm, not stacked.
if err == nil {
obj, err = ctx.newObjectArray(len(v), klass, nil)
}
if err == nil {
objStack = append(objStack, obj)
for i, s := range v {
var str *Object
str, err = ctx.NewStringObject(s)
if err == nil {
// I'm assuming stuffing the array adds a reference inside the JVM.
defer ctx.DeleteLocalRef(str)
ctx.setObjectArrayElement(obj, i, str)
if ctx.ExceptionCheck() {
err = ctx.ExceptionOccurred()
}
}
if err != nil {
break
}
}
}
if err == nil {
alp = append(alp, C.objValue(obj.object))
}
case []byte:
var obj *Object
obj, err = ctx.newByteObject(v)
if err == nil {
alp = append(alp, C.objValue(obj.object))
}
objStack = append(objStack, obj)
case bool:
val := C.jboolean(C.JNI_FALSE)
if v {
val = C.JNI_TRUE
}
alp = append(alp, C.boolValue(val))
default:
err = errors.New(fmt.Sprintf("Unknown type: %T/%s", v, v))
}
if ok != 0 {
err = errors.New("Couldn't parse arg #" + strconv.Itoa(i+1))
}
if err != nil {
break
}
}
return
}