func (g *goGen) genWrite(valName, seqName string, T types.Type) {
if isErrorType(T) {
g.Printf("if %s == nil {\n", valName)
g.Printf(" %s.WriteString(\"\");\n", seqName)
g.Printf("} else {\n")
g.Printf(" %s.WriteString(%s.Error());\n", seqName, valName)
g.Printf("}\n")
return
}
switch T := T.(type) {
case *types.Pointer:
// TODO(crawshaw): test *int
// TODO(crawshaw): test **Generator
switch T := T.Elem().(type) {
case *types.Named:
obj := T.Obj()
if obj.Pkg() != g.pkg {
g.errorf("type %s not defined in package %s", T, g.pkg)
return
}
g.Printf("%s.WriteGoRef(%s)\n", seqName, valName)
default:
g.errorf("unsupported type %s", T)
}
case *types.Named:
switch u := T.Underlying().(type) {
case *types.Interface, *types.Pointer:
g.Printf("%s.WriteGoRef(%s)\n", seqName, valName)
default:
g.errorf("unsupported, direct named type %s: %s", T, u)
}
default:
g.Printf("%s.Write%s(%s);\n", seqName, seqType(T), valName)
}
}
func (g *javaGen) genRead(resName, seqName string, T types.Type) {
switch T := T.(type) {
case *types.Pointer:
// TODO(crawshaw): test *int
// TODO(crawshaw): test **Generator
switch T := T.Elem().(type) {
case *types.Named:
o := T.Obj()
if o.Pkg() != g.pkg {
g.errorf("type %s not defined in %s", T, g.pkg)
return
}
g.Printf("%s = new %s(%s.readRef());\n", resName, o.Name(), seqName)
default:
g.errorf("unsupported type %s", T)
}
case *types.Named:
switch T.Underlying().(type) {
case *types.Interface, *types.Pointer:
o := T.Obj()
if o.Pkg() != g.pkg {
g.errorf("type %s not defined in %s", T, g.pkg)
return
}
g.Printf("%s = new %s.Proxy(%s.readRef());\n", resName, o.Name(), seqName)
default:
g.errorf("unsupported, direct named type %s", T)
}
default:
g.Printf("%s = %s.read%s();\n", resName, seqName, seqType(T))
}
}
// isSupported returns whether the generators can handle the type.
func (g *generator) isSupported(t types.Type) bool {
if isErrorType(t) {
return true
}
switch t := t.(type) {
case *types.Basic:
return true
case *types.Slice:
switch e := t.Elem().(type) {
case *types.Basic:
return e.Kind() == types.Uint8
}
case *types.Pointer:
switch t := t.Elem().(type) {
case *types.Named:
return g.validPkg(t.Obj().Pkg())
}
case *types.Named:
switch t.Underlying().(type) {
case *types.Interface, *types.Pointer:
return g.validPkg(t.Obj().Pkg())
}
}
return false
}
// CanHaveDynamicTypes reports whether the type T can "hold" dynamic types,
// i.e. is an interface (incl. reflect.Type) or a reflect.Value.
//
func CanHaveDynamicTypes(T types.Type) bool {
switch T := T.(type) {
case *types.Named:
if obj := T.Obj(); obj.Name() == "Value" && obj.Pkg().Path() == "reflect" {
return true // reflect.Value
}
return CanHaveDynamicTypes(T.Underlying())
case *types.Interface:
return true
}
return false
}
// 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"
}
}
// CanPoint reports whether the type T is pointerlike,
// for the purposes of this analysis.
func CanPoint(T types.Type) bool {
switch T := T.(type) {
case *types.Named:
if obj := T.Obj(); obj.Name() == "Value" && obj.Pkg().Path() == "reflect" {
return true // treat reflect.Value like interface{}
}
return CanPoint(T.Underlying())
case *types.Pointer, *types.Interface, *types.Map, *types.Chan, *types.Signature, *types.Slice:
return true
}
return false // array struct tuple builtin basic
}
func isExported(t types.Type) bool {
if isErrorType(t) {
return true
}
switch t := t.(type) {
case *types.Basic:
return true
case *types.Named:
return t.Obj().Exported()
case *types.Pointer:
return isExported(t.Elem())
default:
return true
}
}
func describeType(qpos *queryPos, path []ast.Node) (*describeTypeResult, error) {
var description string
var t types.Type
switch n := path[0].(type) {
case *ast.Ident:
t = qpos.info.TypeOf(n)
switch t := t.(type) {
case *types.Basic:
description = "reference to built-in "
case *types.Named:
isDef := t.Obj().Pos() == n.Pos() // see caveats at isDef above
if isDef {
description = "definition of "
} else if _, ok := qpos.info.ObjectOf(n).(*types.Alias); ok {
description = "alias of "
} else {
description = "reference to "
}
}
case ast.Expr:
t = qpos.info.TypeOf(n)
default:
// Unreachable?
return nil, fmt.Errorf("unexpected AST for type: %T", n)
}
description = description + "type " + qpos.typeString(t)
// Show sizes for structs and named types (it's fairly obvious for others).
switch t.(type) {
case *types.Named, *types.Struct:
szs := types.StdSizes{WordSize: 8, MaxAlign: 8} // assume amd64
description = fmt.Sprintf("%s (size %d, align %d)", description,
szs.Sizeof(t), szs.Alignof(t))
}
return &describeTypeResult{
qpos: qpos,
node: path[0],
description: description,
typ: t,
methods: accessibleMethods(t, qpos.info.Pkg),
fields: accessibleFields(t, qpos.info.Pkg),
}, nil
}
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)
}
}
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 (g *objcGen) refTypeBase(typ types.Type) string {
switch typ := typ.(type) {
case *types.Pointer:
if _, ok := typ.Elem().(*types.Named); ok {
return g.objcType(typ.Elem())
}
case *types.Named:
n := typ.Obj()
if n.Pkg() == g.pkg {
switch typ.Underlying().(type) {
case *types.Interface, *types.Struct:
return g.namePrefix + n.Name()
}
}
}
// fallback to whatever objcType returns. This must not happen.
return g.objcType(typ)
}
func (g *ObjcGen) refTypeBase(typ types.Type) string {
switch typ := typ.(type) {
case *types.Pointer:
if _, ok := typ.Elem().(*types.Named); ok {
return g.objcType(typ.Elem())
}
case *types.Named:
n := typ.Obj()
if isObjcType(typ) {
return g.wrapMap[n.Name()].Name
}
if isErrorType(typ) || g.validPkg(n.Pkg()) {
switch typ.Underlying().(type) {
case *types.Interface, *types.Struct:
return g.namePrefixOf(n.Pkg()) + n.Name()
}
}
}
// fallback to whatever objcType returns. This must not happen.
return g.objcType(typ)
}
// javaType returns a string that can be used as a Java type.
func (g *JavaGen) javaType(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 "java.lang.Exception"
} else if isJavaType(T) {
return classNameFor(T)
}
switch T := T.(type) {
case *types.Basic:
return g.javaBasicType(T)
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())
}
g.errorf("unsupported pointer to type: %s", T)
case *types.Named:
n := T.Obj()
nPkg := n.Pkg()
if !isErrorType(T) && !g.validPkg(nPkg) {
g.errorf("type %s is in %s, which is not bound", n.Name(), nPkg)
break
}
// TODO(crawshaw): more checking here
if nPkg != g.Pkg {
return fmt.Sprintf("%s.%s", g.javaPkgName(nPkg), n.Name())
} else {
return n.Name()
}
default:
g.errorf("unsupported javaType: %#+v, %s\n", T, T)
}
return "TODO"
}
func (g *objcGen) objcType(typ types.Type) string {
if isErrorType(typ) {
return "NSError*"
}
switch typ := typ.(type) {
case *types.Basic:
switch typ.Kind() {
case types.Bool:
return "BOOL"
case types.Int:
return "int"
case types.Int8:
return "int8_t"
case types.Int16:
return "int16_t"
case types.Int32:
return "int32_t"
case types.Int64:
return "int64_t"
case types.Uint8:
// byte is an alias of uint8, and the alias is lost.
return "byte"
case types.Uint16:
return "uint16_t"
case types.Uint32:
return "uint32_t"
case types.Uint64:
return "uint64_t"
case types.Float32:
return "float"
case types.Float64:
return "double"
case types.String:
return "NSString*"
default:
g.errorf("unsupported type: %s", typ)
return "TODO"
}
case *types.Slice:
elem := g.objcType(typ.Elem())
// Special case: NSData seems to be a better option for byte slice.
if elem == "byte" {
return "NSData*"
}
// TODO(hyangah): support other slice types: NSArray or CFArrayRef.
// Investigate the performance implication.
g.errorf("unsupported type: %s", typ)
return "TODO"
case *types.Pointer:
if _, ok := typ.Elem().(*types.Named); ok {
return g.objcType(typ.Elem()) + "*"
}
g.errorf("unsupported pointer to type: %s", typ)
return "TODO"
case *types.Named:
n := typ.Obj()
if n.Pkg() != g.pkg {
g.errorf("type %s is in package %s; only types defined in package %s is supported", n.Name(), n.Pkg().Name(), g.pkg.Name())
return "TODO"
}
switch typ.Underlying().(type) {
case *types.Interface:
return "id<" + g.namePrefix + n.Name() + ">"
case *types.Struct:
return g.namePrefix + n.Name()
}
g.errorf("unsupported, named type %s", typ)
return "TODO"
default:
g.errorf("unsupported type: %#+v, %s", typ, typ)
return "TODO"
}
}
func (p *exporter) typ(t types.Type) {
if t == nil {
log.Fatalf("gcimporter: nil type")
}
// Possible optimization: Anonymous pointer types *T where
// T is a named type are common. We could canonicalize all
// such types *T to a single type PT = *T. This would lead
// to at most one *T entry in typIndex, and all future *T's
// would be encoded as the respective index directly. Would
// save 1 byte (pointerTag) per *T and reduce the typIndex
// size (at the cost of a canonicalization map). We can do
// this later, without encoding format change.
// if we saw the type before, write its index (>= 0)
if i, ok := p.typIndex[t]; ok {
p.index('T', i)
return
}
// otherwise, remember the type, write the type tag (< 0) and type data
if trackAllTypes {
if trace {
p.tracef("T%d = {>\n", len(p.typIndex))
defer p.tracef("<\n} ")
}
p.typIndex[t] = len(p.typIndex)
}
switch t := t.(type) {
case *types.Named:
if !trackAllTypes {
// if we don't track all types, track named types now
p.typIndex[t] = len(p.typIndex)
}
p.tag(namedTag)
p.pos(t.Obj())
p.qualifiedName(t.Obj())
p.typ(t.Underlying())
if !types.IsInterface(t) {
p.assocMethods(t)
}
case *types.Array:
p.tag(arrayTag)
p.int64(t.Len())
p.typ(t.Elem())
case *types.Slice:
p.tag(sliceTag)
p.typ(t.Elem())
case *dddSlice:
p.tag(dddTag)
p.typ(t.elem)
case *types.Struct:
p.tag(structTag)
p.fieldList(t)
case *types.Pointer:
p.tag(pointerTag)
p.typ(t.Elem())
case *types.Signature:
p.tag(signatureTag)
p.paramList(t.Params(), t.Variadic())
p.paramList(t.Results(), false)
case *types.Interface:
p.tag(interfaceTag)
p.iface(t)
case *types.Map:
p.tag(mapTag)
p.typ(t.Key())
p.typ(t.Elem())
case *types.Chan:
p.tag(chanTag)
p.int(int(3 - t.Dir())) // hack
p.typ(t.Elem())
default:
log.Fatalf("gcimporter: unexpected type %T: %s", t, t)
}
}
func (g *ObjcGen) objcType(typ types.Type) string {
if isErrorType(typ) {
return "NSError*"
}
switch typ := typ.(type) {
case *types.Basic:
switch typ.Kind() {
case types.Bool, types.UntypedBool:
return "BOOL"
case types.Int:
return "long"
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:
// byte is an alias of uint8, and the alias is lost.
return "byte"
case types.Uint16:
return "uint16_t"
case types.Uint32:
return "uint32_t"
case types.Uint64:
return "uint64_t"
case types.Float32:
return "float"
case types.Float64, types.UntypedFloat:
return "double"
case types.String, types.UntypedString:
return "NSString*"
default:
g.errorf("unsupported type: %s", typ)
return "TODO"
}
case *types.Slice:
elem := g.objcType(typ.Elem())
// Special case: NSData seems to be a better option for byte slice.
if elem == "byte" {
return "NSData*"
}
// TODO(hyangah): support other slice types: NSArray or CFArrayRef.
// Investigate the performance implication.
g.errorf("unsupported type: %s", typ)
return "TODO"
case *types.Pointer:
if _, ok := typ.Elem().(*types.Named); ok {
return g.objcType(typ.Elem()) + "*"
}
g.errorf("unsupported pointer to type: %s", typ)
return "TODO"
case *types.Named:
n := typ.Obj()
if isObjcType(typ) {
w := g.wrapMap[n.Name()]
return w.ObjcType()
}
if !isErrorType(typ) && !g.validPkg(n.Pkg()) {
g.errorf("type %s is in package %s, which is not bound", n.Name(), n.Pkg().Name())
return "TODO"
}
switch t := typ.Underlying().(type) {
case *types.Interface:
if makeIfaceSummary(t).implementable {
return "id<" + g.namePrefixOf(n.Pkg()) + n.Name() + ">"
} else {
return g.namePrefixOf(n.Pkg()) + n.Name() + "*"
}
case *types.Struct:
return g.namePrefixOf(n.Pkg()) + n.Name()
}
g.errorf("unsupported, named type %s", typ)
return "TODO"
default:
g.errorf("unsupported type: %#+v, %s", typ, typ)
return "TODO"
}
}
// javaType returns a string that can be used as a Java type.
func (g *javaGen) javaType(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 "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:
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.Uint8: // types.Byte
// 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, types.UntypedFloat:
return "double"
case types.String, types.UntypedString:
return "String"
default:
g.errorf("unsupported basic 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("unsupported pointer to type: %s", T))
case *types.Named:
n := T.Obj()
if n.Pkg() != g.pkg {
nPkgName := "<nilpkg>"
if nPkg := n.Pkg(); nPkg != nil {
nPkgName = nPkg.Name()
}
panic(fmt.Sprintf("type %s is in package %s, must be defined in package %s", n.Name(), nPkgName, g.pkg.Name()))
}
// TODO(crawshaw): more checking here
return n.Name()
default:
g.errorf("unsupported javaType: %#+v, %s\n", T, T)
return "TODO"
}
}
func (w *Walker) writeType(buf *bytes.Buffer, typ types.Type) {
switch typ := typ.(type) {
case *types.Basic:
s := typ.Name()
switch typ.Kind() {
case types.UnsafePointer:
s = "unsafe.Pointer"
case types.UntypedBool:
s = "ideal-bool"
case types.UntypedInt:
s = "ideal-int"
case types.UntypedRune:
// "ideal-char" for compatibility with old tool
// TODO(gri) change to "ideal-rune"
s = "ideal-char"
case types.UntypedFloat:
s = "ideal-float"
case types.UntypedComplex:
s = "ideal-complex"
case types.UntypedString:
s = "ideal-string"
case types.UntypedNil:
panic("should never see untyped nil type")
default:
switch s {
case "byte":
s = "uint8"
case "rune":
s = "int32"
}
}
buf.WriteString(s)
case *types.Array:
fmt.Fprintf(buf, "[%d]", typ.Len())
w.writeType(buf, typ.Elem())
case *types.Slice:
buf.WriteString("[]")
w.writeType(buf, typ.Elem())
case *types.Struct:
buf.WriteString("struct")
case *types.Pointer:
buf.WriteByte('*')
w.writeType(buf, typ.Elem())
case *types.Tuple:
panic("should never see a tuple type")
case *types.Signature:
buf.WriteString("func")
w.writeSignature(buf, typ)
case *types.Interface:
buf.WriteString("interface{")
if typ.NumMethods() > 0 {
buf.WriteByte(' ')
buf.WriteString(strings.Join(sortedMethodNames(typ), ", "))
buf.WriteByte(' ')
}
buf.WriteString("}")
case *types.Map:
buf.WriteString("map[")
w.writeType(buf, typ.Key())
buf.WriteByte(']')
w.writeType(buf, typ.Elem())
case *types.Chan:
var s string
switch typ.Dir() {
case types.SendOnly:
s = "chan<- "
case types.RecvOnly:
s = "<-chan "
case types.SendRecv:
s = "chan "
default:
panic("unreachable")
}
buf.WriteString(s)
w.writeType(buf, typ.Elem())
case *types.Named:
obj := typ.Obj()
pkg := obj.Pkg()
if pkg != nil && pkg != w.current {
buf.WriteString(pkg.Name())
buf.WriteByte('.')
}
buf.WriteString(typ.Obj().Name())
default:
panic(fmt.Sprintf("unknown type %T", typ))
}
}
// hashFor computes the hash of t.
func (h Hasher) hashFor(t types.Type) uint32 {
// See Identical for rationale.
switch t := t.(type) {
case *types.Basic:
return uint32(t.Kind())
case *types.Array:
return 9043 + 2*uint32(t.Len()) + 3*h.Hash(t.Elem())
case *types.Slice:
return 9049 + 2*h.Hash(t.Elem())
case *types.Struct:
var hash uint32 = 9059
for i, n := 0, t.NumFields(); i < n; i++ {
f := t.Field(i)
if f.Anonymous() {
hash += 8861
}
hash += hashString(t.Tag(i))
hash += hashString(f.Name()) // (ignore f.Pkg)
hash += h.Hash(f.Type())
}
return hash
case *types.Pointer:
return 9067 + 2*h.Hash(t.Elem())
case *types.Signature:
var hash uint32 = 9091
if t.Variadic() {
hash *= 8863
}
return hash + 3*h.hashTuple(t.Params()) + 5*h.hashTuple(t.Results())
case *types.Interface:
var hash uint32 = 9103
for i, n := 0, t.NumMethods(); i < n; i++ {
// See go/types.identicalMethods for rationale.
// Method order is not significant.
// Ignore m.Pkg().
m := t.Method(i)
hash += 3*hashString(m.Name()) + 5*h.Hash(m.Type())
}
return hash
case *types.Map:
return 9109 + 2*h.Hash(t.Key()) + 3*h.Hash(t.Elem())
case *types.Chan:
return 9127 + 2*uint32(t.Dir()) + 3*h.Hash(t.Elem())
case *types.Named:
// Not safe with a copying GC; objects may move.
return uint32(reflect.ValueOf(t.Obj()).Pointer())
case *types.Tuple:
return h.hashTuple(t)
}
panic(t)
}