forked from abneptis/GoJVM
/
globals.c.go
176 lines (164 loc) · 5.19 KB
/
globals.c.go
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package gojvm
//#include "helpers.h"
import "C"
import (
"errors"
"github.com/timob/gojvm/types"
"reflect"
"sync"
"unsafe"
)
var debug = false
// due to the design of the JNI callback method, in order to support
// callbacks (safely), we need to be able to map from C.JVM and C.JNIEnv
// into their local types.
// the AllVMs & AllEnvs structures handles this via a go (RW)mutex.
type vmPtrMap struct {
jvms map[uintptr]*JVM
maplock *sync.RWMutex
}
type envPtrMap struct {
envs map[uintptr]*Environment
maplock *sync.RWMutex
}
var AllVMs = &vmPtrMap{map[uintptr]*JVM{}, &sync.RWMutex{}}
var AllEnvs = &envPtrMap{map[uintptr]*Environment{}, &sync.RWMutex{}}
func (self *vmPtrMap) Find(ptr uintptr) *JVM {
self.maplock.RLock()
defer self.maplock.RUnlock()
return self.jvms[ptr]
}
func (self *vmPtrMap) Add(vm *JVM) {
self.maplock.Lock()
defer self.maplock.Unlock()
self.jvms[uintptr(unsafe.Pointer(vm.jvm))] = vm
}
func (self *envPtrMap) Find(ptr uintptr) *Environment {
self.maplock.RLock()
defer self.maplock.RUnlock()
return self.envs[ptr]
}
func (self *envPtrMap) Add(env *Environment) {
self.maplock.Lock()
defer self.maplock.Unlock()
self.envs[uintptr(unsafe.Pointer(env.env))] = env
}
//export goCallbackNArgs
func goCallbackNArgs(envp, obj uintptr, fId int) int {
env := AllEnvs.Find(envp)
if env == nil {
return -1
}
if env.jvm == nil {
return -1
}
var cd callbackDescriptor
var ok bool
if cd, ok = env.jvm.registered[fId]; !ok {
return -1
}
return len(cd.Signature.Params)
}
// 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")
}