forked from abneptis/GoJVM
/
method_sig_helpers.c.go
140 lines (133 loc) · 3.61 KB
/
method_sig_helpers.c.go
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package gojvm
//#cgo CFLAGS:-I../include/
//#cgo LDFLAGS:-ljvm -L/usr/lib/jvm/java-6-sun/jre/lib/amd64/server/
//#include "helpers.h"
import "C"
import (
"errors"
"fmt"
"github.com/timob/gojvm/types"
"reflect"
)
func TypeOf(env *Environment, v interface{}) (k types.Typed, err error) {
if kind, ok := v.(types.Typed); ok {
return kind, nil
}
switch vt := v.(type) {
case C.jstring:
return types.Class{types.JavaLangString}, nil
case types.Typed:
return vt, nil
case *Object:
name, err2 := vt.Name(env)
if err2 != nil {
err = err2
return
}
return types.Class{name}, nil
case *ObjectArray:
return types.Array{types.Class{vt.Name}}, nil
case *CastObject:
return types.Class{vt.Name}, nil
}
k, err = reflectedType(env, v)
return
}
func reflectedType(env *Environment, v interface{}) (k types.Typed, err error) {
vtype := reflect.TypeOf(v)
vkind := vtype.Kind()
switch vkind {
case reflect.Ptr:
k, err = TypeOf(env, reflect.Indirect(reflect.ValueOf(v)).Interface())
case reflect.Bool:
k = types.Basic(types.BoolKind)
case reflect.Uint8, reflect.Int8:
k = types.Basic(types.ByteKind)
case reflect.Int16, reflect.Uint16:
k = types.Basic(types.ShortKind)
case reflect.Int32, reflect.Uint32:
k = types.Basic(types.IntKind)
case reflect.Uint64, reflect.Int64:
k = types.Basic(types.LongKind)
case reflect.Int, reflect.Uint:
k = types.Basic(types.IntKind)
case reflect.Float32:
k = types.Basic(types.FloatKind)
case reflect.Float64:
k = types.Basic(types.DoubleKind)
case reflect.Struct:
k = types.Class{[]string{"golang", vkind.String()}}
case reflect.String:
k = types.Class{types.JavaLangString}
case reflect.Slice, reflect.Array:
sltype := vtype.Elem()
switch sltype.Kind() {
case reflect.Uint8:
k = types.Array{types.Basic(types.ByteKind)}
case reflect.String:
k = types.Array{types.Class{types.JavaLangString}}
default:
err = errors.New("Unhandled slice type " + sltype.String())
}
default:
switch T := v.(type) {
default:
err = errors.New(fmt.Sprintf("Unsure how to TypeOf '%s'/%T", vkind.String(), T))
}
}
return
}
type errInterface interface {
Error() string
}
func ReflectedSignature(ctx *Environment, f interface{}) (sig types.MethodSignature, err error) {
sig.Return = types.Basic(types.UnspecKind)
ftype := reflect.TypeOf(f)
sig.Params = make([]types.Typed, 0)
if ftype.Kind() != reflect.Func {
err = errors.New("ReflectedSignature: f is not a function")
}
if err == nil && ftype.NumIn() < 2 {
err = errors.New("ReflectedSignature: f is not a callback (insufficient args)")
}
if err == nil && ftype.NumOut() > 1 {
err = errors.New("ReflectedSignature: f is not a callback (too many returns)")
}
if err == nil && ftype.In(0) != reflect.TypeOf(&Environment{}) {
err = errors.New("bad first-arg Type: must be *Environment")
}
if err == nil && ftype.In(1) != reflect.TypeOf(&Object{}) {
err = errors.New("bad second-arg Type: must be *Object")
}
if err != nil {
return
}
for i := 2; i < ftype.NumIn(); i++ {
var k types.Typed
if ftype.In(i).Kind() == reflect.Ptr {
if ftype.In(i) == reflect.TypeOf(&Object{}) {
k = types.Class{types.JavaLangObject}
} else {
itype := ftype.In(i).Elem()
pobj := reflect.New(itype).Interface()
k, err = TypeOf(ctx, pobj)
}
} else {
k, err = TypeOf(ctx, reflect.New(ftype.In(i)).Interface())
}
if err != nil {
break
}
sig.Params = append(sig.Params, k)
}
if ftype.NumOut() == 1 {
var k types.Typed
k, err = reflectedType(ctx, reflect.New(ftype.Out(0)).Interface())
if err == nil {
sig.Return = k
}
} else {
sig.Return = types.Basic(types.VoidKind)
}
return
}