Golang Type.Kind方法代码示例

func (g *ObjcGen) genWrite(varName string, t types.Type, mode varMode) {
	switch t := t.(type) {
	case *types.Basic:
		switch t.Kind() {
		case types.String:
			g.Printf("nstring _%s = go_seq_from_objc_string(%s);\n", varName, varName)
		default:
			g.Printf("%s _%s = (%s)%s;\n", g.cgoType(t), varName, g.cgoType(t), varName)
		}
	case *types.Slice:
		switch e := t.Elem().(type) {
		case *types.Basic:
			switch e.Kind() {
			case types.Uint8: // Byte.
				g.Printf("nbyteslice _%s = go_seq_from_objc_bytearray(%s, %d);\n", varName, varName, toCFlag(mode == modeRetained))
			default:
				g.errorf("unsupported type: %s", t)
			}
		default:
			g.errorf("unsupported type: %s", t)
		}
	case *types.Named:
		switch u := t.Underlying().(type) {
		case *types.Interface:
			g.genRefWrite(varName)
		default:
			g.errorf("unsupported named type: %s / %T", u, u)
		}
	case *types.Pointer:
		g.genRefWrite(varName)
	default:
		g.Printf("%s _%s = (%s)%s;\n", g.cgoType(t), varName, g.cgoType(t), varName)
	}
}

// zeroConst returns a new "zero" constant of the specified type,
// which must not be an array or struct type: the zero values of
// aggregates are well-defined but cannot be represented by Const.
//
func zeroConst(t types.Type) *Const {
	switch t := t.(type) {
	case *types.Basic:
		switch {
		case t.Info()&types.IsBoolean != 0:
			return NewConst(exact.MakeBool(false), t)
		case t.Info()&types.IsNumeric != 0:
			return NewConst(exact.MakeInt64(0), t)
		case t.Info()&types.IsString != 0:
			return NewConst(exact.MakeString(""), t)
		case t.Kind() == types.UnsafePointer:
			fallthrough
		case t.Kind() == types.UntypedNil:
			return nilConst(t)
		default:
			panic(fmt.Sprint("zeroConst for unexpected type:", t))
		}
	case *types.Pointer, *types.Slice, *types.Interface, *types.Chan, *types.Map, *types.Signature:
		return nilConst(t)
	case *types.Named:
		return NewConst(zeroConst(t.Underlying()).Value, t)
	case *types.Array, *types.Struct, *types.Tuple:
		panic(fmt.Sprint("zeroConst applied to aggregate:", t))
	}
	panic(fmt.Sprint("zeroConst: unexpected ", t))
}

func asmKindForType(t types.Type, size int) asmKind {
	switch t := t.Underlying().(type) {
	case *types.Basic:
		switch t.Kind() {
		case types.String:
			return asmString
		case types.Complex64, types.Complex128:
			return asmComplex
		}
		return asmKind(size)
	case *types.Pointer, *types.Chan, *types.Map, *types.Signature:
		return asmKind(size)
	case *types.Struct:
		return asmStruct
	case *types.Interface:
		if t.Empty() {
			return asmEmptyInterface
		}
		return asmInterface
	case *types.Array:
		return asmArray
	case *types.Slice:
		return asmSlice
	}
	panic("unreachable")
}

// javaTypeDefault returns a string that represents the default value of the mapped java type.
// TODO(hyangah): Combine javaType and javaTypeDefault?
func (g *javaGen) javaTypeDefault(T types.Type) string {
	switch T := T.(type) {
	case *types.Basic:
		switch T.Kind() {
		case types.Bool:
			return "false"
		case types.Int, types.Int8, types.Int16, types.Int32,
			types.Int64, types.Uint8:
			return "0"
		case types.Float32, types.Float64:
			return "0.0"
		case types.String:
			return "null"
		default:
			g.errorf("unsupported return type: %s", T)
			return "TODO"
		}
	case *types.Slice, *types.Pointer, *types.Named:
		return "null"

	default:
		g.errorf("unsupported javaType: %#+v, %s\n", T, T)
		return "TODO"
	}
}

// cgoType returns the name of a Cgo type suitable for converting a value of
// the given type.
func (g *generator) cgoType(t types.Type) string {
	if isErrorType(t) {
		return g.cgoType(types.Typ[types.String])
	}
	switch t := t.(type) {
	case *types.Basic:
		switch t.Kind() {
		case types.Bool, types.UntypedBool:
			return "char"
		case types.Int:
			return "nint"
		case types.Int8:
			return "int8_t"
		case types.Int16:
			return "int16_t"
		case types.Int32, types.UntypedRune: // types.Rune
			return "int32_t"
		case types.Int64, types.UntypedInt:
			return "int64_t"
		case types.Uint8: // types.Byte
			return "uint8_t"
		// TODO(crawshaw): case types.Uint, types.Uint16, types.Uint32, types.Uint64:
		case types.Float32:
			return "float"
		case types.Float64, types.UntypedFloat:
			return "double"
		case types.String:
			return "nstring"
		default:
			g.errorf("unsupported basic type: %s", t)
		}
	case *types.Slice:
		switch e := t.Elem().(type) {
		case *types.Basic:
			switch e.Kind() {
			case types.Uint8: // Byte.
				return "nbyteslice"
			default:
				g.errorf("unsupported slice type: %s", t)
			}
		default:
			g.errorf("unsupported slice type: %s", t)
		}
	case *types.Pointer:
		if _, ok := t.Elem().(*types.Named); ok {
			return g.cgoType(t.Elem())
		}
		g.errorf("unsupported pointer to type: %s", t)
	case *types.Named:
		return "int32_t"
	default:
		g.errorf("unsupported type: %s", t)
	}
	return "TODO"
}

func (g *goGen) genWrite(toVar, fromVar string, t types.Type, mode varMode) {
	if isErrorType(t) {
		g.Printf("var %s_str string\n", toVar)
		g.Printf("if %s == nil {\n", fromVar)
		g.Printf("    %s_str = \"\"\n", toVar)
		g.Printf("} else {\n")
		g.Printf("    %s_str = %s.Error()\n", toVar, fromVar)
		g.Printf("}\n")
		g.genWrite(toVar, toVar+"_str", types.Typ[types.String], mode)
		return
	}
	switch t := t.(type) {
	case *types.Basic:
		switch t.Kind() {
		case types.String:
			g.Printf("%s := encodeString(%s)\n", toVar, fromVar)
		case types.Bool:
			g.Printf("var %s C.%s = 0\n", toVar, g.cgoType(t))
			g.Printf("if %s { %s = 1 }\n", fromVar, toVar)
		default:
			g.Printf("%s := C.%s(%s)\n", toVar, g.cgoType(t), fromVar)
		}
	case *types.Slice:
		switch e := t.Elem().(type) {
		case *types.Basic:
			switch e.Kind() {
			case types.Uint8: // Byte.
				g.Printf("%s := fromSlice(%s, %v)\n", toVar, fromVar, mode == modeRetained)
			default:
				g.errorf("unsupported type: %s", t)
			}
		default:
			g.errorf("unsupported type: %s", t)
		}
	case *types.Pointer:
		// TODO(crawshaw): test *int
		// TODO(crawshaw): test **Generator
		switch t := t.Elem().(type) {
		case *types.Named:
			g.genToRefNum(toVar, fromVar)
		default:
			g.errorf("unsupported type %s", t)
		}
	case *types.Named:
		switch u := t.Underlying().(type) {
		case *types.Interface, *types.Pointer:
			g.genToRefNum(toVar, fromVar)
		default:
			g.errorf("unsupported, direct named type %s: %s", t, u)
		}
	default:
		g.errorf("unsupported type %s", t)
	}
}

// javaType returns a string that can be used as a Java type.
func (g *javaGen) javaType(T types.Type) string {
	switch T := T.(type) {
	case *types.Basic:
		switch T.Kind() {
		case types.Bool:
			return "boolean"
		case types.Int:
			return "long"
		case types.Int8:
			return "byte"
		case types.Int16:
			return "short"
		case types.Int32:
			return "int"
		case types.Int64:
			return "long"
		case types.Uint8:
			// TODO(crawshaw): Java bytes are signed, so this is
			// questionable, but vital.
			return "byte"
		// TODO(crawshaw): case types.Uint, types.Uint16, types.Uint32, types.Uint64:
		case types.Float32:
			return "float"
		case types.Float64:
			return "double"
		case types.String:
			return "String"
		default:
			g.errorf("unsupported return type: %s", T)
			return "TODO"
		}
	case *types.Slice:
		elem := g.javaType(T.Elem())
		return elem + "[]"

	case *types.Pointer:
		if _, ok := T.Elem().(*types.Named); ok {
			return g.javaType(T.Elem())
		}
		panic(fmt.Sprintf("unsupporter pointer to type: %s", T))
	case *types.Named:
		n := T.Obj()
		if n.Pkg() != g.pkg {
			panic(fmt.Sprintf("type %s is in package %s, must be defined in package %s", n.Name(), n.Pkg().Name(), g.pkg.Name()))
		}
		// TODO(crawshaw): more checking here
		return n.Name()
	default:
		g.errorf("unsupported javaType: %#+v, %s\n", T, T)
		return "TODO"
	}
}

// jniType returns a string that can be used as a JNI type.
func (g *javaGen) jniType(T types.Type) string {
	if isErrorType(T) {
		// The error type is usually translated into an exception in
		// Java, however the type can be exposed in other ways, such
		// as an exported field.
		return g.jniType(types.Typ[types.String])
	}
	switch T := T.(type) {
	case *types.Basic:
		switch T.Kind() {
		case types.Bool, types.UntypedBool:
			return "jboolean"
		case types.Int:
			return "jlong"
		case types.Int8:
			return "jbyte"
		case types.Int16:
			return "jshort"
		case types.Int32, types.UntypedRune: // types.Rune
			return "jint"
		case types.Int64, types.UntypedInt:
			return "jlong"
		case types.Uint8: // types.Byte
			// TODO(crawshaw): Java bytes are signed, so this is
			// questionable, but vital.
			return "jbyte"
		// TODO(crawshaw): case types.Uint, types.Uint16, types.Uint32, types.Uint64:
		case types.Float32:
			return "jfloat"
		case types.Float64, types.UntypedFloat:
			return "jdouble"
		case types.String, types.UntypedString:
			return "jstring"
		default:
			g.errorf("unsupported basic type: %s", T)
			return "TODO"
		}
	case *types.Slice:
		return "jbyteArray"

	case *types.Pointer:
		if _, ok := T.Elem().(*types.Named); ok {
			return g.jniType(T.Elem())
		}
		g.errorf("unsupported pointer to type: %s", T)
	case *types.Named:
		return "jobject"
	default:
		g.errorf("unsupported jniType: %#+v, %s\n", T, T)
	}
	return "TODO"
}

func (g *javaGen) genCToJava(toName, fromName string, t types.Type, mode varMode) {
	if isErrorType(t) {
		g.genCToJava(toName, fromName, types.Typ[types.String], mode)
		return
	}
	switch t := t.(type) {
	case *types.Basic:
		switch t.Kind() {
		case types.String:
			g.Printf("jstring %s = go_seq_to_java_string(env, %s);\n", toName, fromName)
		case types.Bool:
			g.Printf("jboolean %s = %s ? JNI_TRUE : JNI_FALSE;\n", toName, fromName)
		default:
			g.Printf("%s %s = (%s)%s;\n", g.jniType(t), toName, g.jniType(t), fromName)
		}
	case *types.Slice:
		switch e := t.Elem().(type) {
		case *types.Basic:
			switch e.Kind() {
			case types.Uint8: // Byte.
				g.Printf("jbyteArray %s = go_seq_to_java_bytearray(env, %s, %d);\n", toName, fromName, g.toCFlag(mode == modeRetained))
			default:
				g.errorf("unsupported type: %s", t)
			}
		default:
			g.errorf("unsupported type: %s", t)
		}
	case *types.Pointer:
		// TODO(crawshaw): test *int
		// TODO(crawshaw): test **Generator
		switch t := t.Elem().(type) {
		case *types.Named:
			g.genFromRefnum(toName, fromName, t, t.Obj())
		default:
			g.errorf("unsupported type %s", t)
		}
	case *types.Named:
		switch t.Underlying().(type) {
		case *types.Interface, *types.Pointer:
			g.genFromRefnum(toName, fromName, t, t.Obj())
		default:
			g.errorf("unsupported, direct named type %s", t)
		}
	default:
		g.Printf("%s %s = (%s)%s;\n", g.jniType(t), toName, g.jniType(t), fromName)
	}
}

// jniType returns a string that can be used as a JNI type.
func (g *JavaGen) jniType(T types.Type) string {
	switch T := T.(type) {
	case *types.Basic:
		switch T.Kind() {
		case types.Bool, types.UntypedBool:
			return "jboolean"
		case types.Int:
			return "jlong"
		case types.Int8:
			return "jbyte"
		case types.Int16:
			return "jshort"
		case types.Int32, types.UntypedRune: // types.Rune
			return "jint"
		case types.Int64, types.UntypedInt:
			return "jlong"
		case types.Uint8: // types.Byte
			// TODO(crawshaw): Java bytes are signed, so this is
			// questionable, but vital.
			return "jbyte"
		// TODO(crawshaw): case types.Uint, types.Uint16, types.Uint32, types.Uint64:
		case types.Float32:
			return "jfloat"
		case types.Float64, types.UntypedFloat:
			return "jdouble"
		case types.String, types.UntypedString:
			return "jstring"
		default:
			g.errorf("unsupported basic type: %s", T)
			return "TODO"
		}
	case *types.Slice:
		return "jbyteArray"

	case *types.Pointer:
		if _, ok := T.Elem().(*types.Named); ok {
			return g.jniType(T.Elem())
		}
		g.errorf("unsupported pointer to type: %s", T)
	case *types.Named:
		return "jobject"
	default:
		g.errorf("unsupported jniType: %#+v, %s\n", T, T)
	}
	return "TODO"
}

func (g *objcGen) genRead(toName, fromName string, t types.Type, mode varMode) {
	if isErrorType(t) {
		g.genRead(toName, fromName, types.Typ[types.String], mode)
		return
	}
	switch t := t.(type) {
	case *types.Basic:
		switch t.Kind() {
		case types.String:
			g.Printf("NSString *%s = go_seq_to_objc_string(%s);\n", toName, fromName)
		case types.Bool:
			g.Printf("BOOL %s = %s ? YES : NO;\n", toName, fromName)
		default:
			g.Printf("%s %s = (%s)%s;\n", g.objcType(t), toName, g.objcType(t), fromName)
		}
	case *types.Slice:
		switch e := t.Elem().(type) {
		case *types.Basic:
			switch e.Kind() {
			case types.Uint8: // Byte.
				g.Printf("NSData *%s = go_seq_to_objc_bytearray(%s, %d);\n", toName, fromName, g.toCFlag(mode == modeRetained))
			default:
				g.errorf("unsupported type: %s", t)
			}
		default:
			g.errorf("unsupported type: %s", t)
		}
	case *types.Pointer:
		switch t := t.Elem().(type) {
		case *types.Named:
			g.genRefRead(toName, fromName, types.NewPointer(t))
		default:
			g.errorf("unsupported type %s", t)
		}
	case *types.Named:
		switch t.Underlying().(type) {
		case *types.Interface, *types.Pointer:
			g.genRefRead(toName, fromName, t)
		default:
			g.errorf("unsupported, direct named type %s", t)
		}
	default:
		g.Printf("%s %s = (%s)%s;\n", g.objcType(t), toName, g.objcType(t), fromName)
	}
}

func (g *javaGen) jniSigType(T types.Type) string {
	if isErrorType(T) {
		return g.jniSigType(types.Typ[types.String])
	}
	switch T := T.(type) {
	case *types.Basic:
		switch T.Kind() {
		case types.Bool, types.UntypedBool:
			return "Z"
		case types.Int:
			return "J"
		case types.Int8:
			return "B"
		case types.Int16:
			return "S"
		case types.Int32, types.UntypedRune: // types.Rune
			return "I"
		case types.Int64, types.UntypedInt:
			return "J"
		case types.Uint8: // types.Byte
			return "B"
		case types.Float32:
			return "F"
		case types.Float64, types.UntypedFloat:
			return "D"
		case types.String, types.UntypedString:
			return "Ljava/lang/String;"
		default:
			g.errorf("unsupported basic type: %s", T)
			return "TODO"
		}
	case *types.Slice:
		return "[" + g.jniSigType(T.Elem())
	case *types.Pointer:
		if _, ok := T.Elem().(*types.Named); ok {
			return g.jniSigType(T.Elem())
		}
		g.errorf("unsupported pointer to type: %s", T)
	case *types.Named:
		return "L" + g.jniClassSigPrefix(T.Obj().Pkg()) + T.Obj().Name() + ";"
	default:
		g.errorf("unsupported jniType: %#+v, %s\n", T, T)
	}
	return "TODO"
}

func (f *File) validResultType(typ types.Type) *Error {
	switch typ.(type) {
	default:
		name := typ.String()
		if named, ok := typ.(*types.Named); ok {
			name = named.Obj().Name()
		}
		return &Error{errors.New(fmt.Sprint("Invalid result type:", name)), 0}
	case *types.Basic:
		typ := typ.(*types.Basic)
		switch typ.Kind() {
		default:

			return &Error{errors.New(fmt.Sprint("Invalid basic type for result type :", typ.Info())), 0}
		case types.Bool:
			return nil
		case types.Int:
			return nil
		case types.Int8:
			return nil
		case types.Int16:
			return nil
		case types.Int32:
			return nil
		case types.Int64:
			return nil
		case types.Uint:
			return nil
		case types.Uint8:
			return nil
		case types.Uint16:
			return nil
		case types.Uint32:
			return nil
		case types.Uint64:
			return nil
		case types.Float32:
			return nil
		case types.Float64:
			return nil
		}
	}
}

func (g *javaGen) jniCallType(t types.Type) string {
	if isErrorType(t) {
		return g.jniCallType(types.Typ[types.String])
	}
	switch t := t.(type) {
	case *types.Basic:
		switch t.Kind() {
		case types.Bool, types.UntypedBool:
			return "Boolean"
		case types.Int:
			return "Long"
		case types.Int8, types.Uint8: // types.Byte
			return "Byte"
		case types.Int16:
			return "Short"
		case types.Int32, types.UntypedRune: // types.Rune
			return "Int"
		case types.Int64, types.UntypedInt:
			return "Long"
		case types.Float32:
			return "Float"
		case types.Float64, types.UntypedFloat:
			return "Double"
		case types.String, types.UntypedString:
			return "Object"
		default:
			g.errorf("unsupported basic type: %s", t)
		}
	case *types.Slice:
		return "Object"
	case *types.Pointer:
		if _, ok := t.Elem().(*types.Named); ok {
			return g.jniCallType(t.Elem())
		}
		g.errorf("unsupported pointer to type: %s", t)
	case *types.Named:
		return "Object"
	default:
		return "Object"
	}
	return "TODO"
}

func (g *javaGen) genJavaToC(varName string, t types.Type, mode varMode) {
	if isErrorType(t) {
		g.genJavaToC(varName, types.Typ[types.String], mode)
		return
	}
	switch t := t.(type) {
	case *types.Basic:
		switch t.Kind() {
		case types.String:
			g.Printf("nstring _%s = go_seq_from_java_string(env, %s);\n", varName, varName)
		default:
			g.Printf("%s _%s = (%s)%s;\n", g.cgoType(t), varName, g.cgoType(t), varName)
		}
	case *types.Slice:
		switch e := t.Elem().(type) {
		case *types.Basic:
			switch e.Kind() {
			case types.Uint8: // Byte.
				g.Printf("nbyteslice _%s = go_seq_from_java_bytearray(env, %s, %d);\n", varName, varName, g.toCFlag(mode == modeRetained))
			default:
				g.errorf("unsupported type: %s", t)
			}
		default:
			g.errorf("unsupported type: %s", t)
		}
	case *types.Named:
		switch u := t.Underlying().(type) {
		case *types.Interface:
			g.Printf("int32_t _%s = go_seq_to_refnum(env, %s);\n", varName, varName)
		default:
			g.errorf("unsupported named type: %s / %T", u, u)
		}
	case *types.Pointer:
		g.Printf("int32_t _%s = go_seq_to_refnum(env, %s);\n", varName, varName)
	default:
		g.Printf("%s _%s = (%s)%s;\n", g.cgoType(t), varName, g.cgoType(t), varName)
	}
}