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 package %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 package %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))
}
}
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)
}
}
// 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 describeType(o *Oracle, 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 {
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:
// TODO(adonovan): use o.imp.Config().TypeChecker.Sizes when
// we add the Config() method (needs some thought).
szs := types.StdSizes{8, 8}
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),
}, nil
}
func (g *goGen) qualifiedType(typ types.Type) string {
switch typ := typ.(type) {
case *types.Basic:
return typ.Name()
case *types.Named:
obj := typ.Obj()
//return obj.Pkg().Name() + "." + obj.Name()
return "GoPy_" + obj.Name()
switch typ := typ.Underlying().(type) {
case *types.Struct:
return typ.String()
default:
return "GoPy_ooops_" + obj.Name()
}
}
return fmt.Sprintf("%#T", typ)
}
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 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"
}
}
// 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)
}