func (g *javaGen) genMethodInterfaceProxy(oName string, m *types.Func) {
if !g.isSigSupported(m.Type()) {
g.Printf("// skipped method %s with unsupported parameter or return types\n\n", oName)
return
}
sig := m.Type().(*types.Signature)
params := sig.Params()
res := sig.Results()
g.genInterfaceMethodSignature(m, oName, false)
g.Indent()
// Push a JNI reference frame with a conservative capacity of two for each per parameter (Seq.Ref and Seq.Object),
// plus extra space for the receiver, the return value, and exception (if any).
g.Printf("JNIEnv *env = go_seq_push_local_frame(%d);\n", 2*params.Len()+10)
g.Printf("jobject o = go_seq_from_refnum(env, refnum, proxy_class_%s_%s, proxy_class_%s_%s_cons);\n", g.pkgPrefix, oName, g.pkgPrefix, oName)
for i := 0; i < params.Len(); i++ {
pn := paramName(params, i)
g.genCToJava("_"+pn, pn, params.At(i).Type(), modeTransient)
}
if res.Len() > 0 && !isErrorType(res.At(0).Type()) {
t := res.At(0).Type()
g.Printf("%s res = (*env)->Call%sMethod(env, o, ", g.jniType(t), g.jniCallType(t))
} else {
g.Printf("(*env)->CallVoidMethod(env, o, ")
}
g.Printf("mid_%s_%s", oName, m.Name())
for i := 0; i < params.Len(); i++ {
g.Printf(", _%s", paramName(params, i))
}
g.Printf(");\n")
var retName string
if res.Len() > 0 {
var rets []string
t := res.At(0).Type()
if !isErrorType(t) {
g.genJavaToC("res", t, modeRetained)
retName = "_res"
rets = append(rets, retName)
}
if res.Len() == 2 || isErrorType(t) {
g.Printf("jstring exc = go_seq_get_exception_message(env);\n")
st := types.Typ[types.String]
g.genJavaToC("exc", st, modeRetained)
retName = "_exc"
rets = append(rets, "_exc")
}
if res.Len() > 1 {
g.Printf("cproxy%s_%s_%s_return sres = {\n", g.pkgPrefix, oName, m.Name())
g.Printf(" %s\n", strings.Join(rets, ", "))
g.Printf("};\n")
retName = "sres"
}
}
g.Printf("go_seq_pop_local_frame(env);\n")
if retName != "" {
g.Printf("return %s;\n", retName)
}
g.Outdent()
g.Printf("}\n\n")
}
func (g *goGen) genFuncSignature(o *types.Func, objName string) {
g.Printf("//export proxy%s_%s_%s\n", g.pkgPrefix, objName, o.Name())
g.Printf("func proxy%s_%s_%s(", g.pkgPrefix, objName, o.Name())
if objName != "" {
g.Printf("refnum C.int32_t")
}
sig := o.Type().(*types.Signature)
params := sig.Params()
for i := 0; i < params.Len(); i++ {
if objName != "" || i > 0 {
g.Printf(", ")
}
p := params.At(i)
g.Printf("param_%s C.%s", g.paramName(params, i), g.cgoType(p.Type()))
}
g.Printf(") ")
res := sig.Results()
if res.Len() > 0 {
g.Printf("(")
for i := 0; i < res.Len(); i++ {
if i > 0 {
g.Printf(", ")
}
g.Printf("C.%s", g.cgoType(res.At(i).Type()))
}
g.Printf(") ")
}
g.Printf("{\n")
}
func (w *Walker) emitFunc(f *types.Func) {
sig := f.Type().(*types.Signature)
if sig.Recv() != nil {
panic("method considered a regular function: " + f.String())
}
w.emitf("func %s%s", f.Name(), w.signatureString(sig))
}
func (g *JavaGen) genConstructor(f *types.Func, n string, jcls bool) {
g.Printf("public %s(", n)
g.genFuncArgs(f, nil, false)
g.Printf(") {\n")
g.Indent()
sig := f.Type().(*types.Signature)
params := sig.Params()
if jcls {
g.Printf("super(")
for i := 0; i < params.Len(); i++ {
if i > 0 {
g.Printf(", ")
}
g.Printf(g.paramName(params, i))
}
g.Printf(");\n")
}
g.Printf("this.ref = ")
g.Printf("__%s(", f.Name())
for i := 0; i < params.Len(); i++ {
if i > 0 {
g.Printf(", ")
}
g.Printf(g.paramName(params, i))
}
g.Printf(");\n")
g.Outdent()
g.Printf("}\n\n")
g.Printf("private static native Seq.Ref __%s(", f.Name())
g.genFuncArgs(f, nil, false)
g.Printf(");\n\n")
}
// identicalSansNames compares two functions to check if their types are identical
// according to the names. e.g.
// - It does not care if the names of the parameters or return values differ
// - It does not care if the implementations of the types differ
func identicalSansNames(fa, fb *types.Func) bool {
// must always succeed
sigA := fa.Type().(*types.Signature)
sigB := fb.Type().(*types.Signature)
var (
lenParams = sigA.Params().Len()
lenResults = sigA.Results().Len()
)
if sigB.Params().Len() != lenParams {
return false
}
if sigB.Results().Len() != lenResults {
return false
}
for i := 0; i < lenParams; i++ {
if types.TypeString(sigA.Params().At(i).Type(), nil) != types.TypeString(sigB.Params().At(i).Type(), nil) {
return false
}
}
for i := 0; i < lenResults; i++ {
if types.TypeString(sigA.Results().At(i).Type(), nil) != types.TypeString(sigB.Results().At(i).Type(), nil) {
return false
}
}
return true
}
func (g *javaGen) genFunc(o *types.Func, method bool) {
if err := g.funcSignature(o, !method); err != nil {
g.errorf("%v", err)
return
}
sig := o.Type().(*types.Signature)
res := sig.Results()
g.Printf(" {\n")
g.Indent()
g.Printf("go.Seq _in = null;\n")
g.Printf("go.Seq _out = null;\n")
returnsError := false
var resultType types.Type
if res.Len() > 0 {
if !isErrorType(res.At(0).Type()) {
resultType = res.At(0).Type()
}
if res.Len() > 1 || isErrorType(res.At(0).Type()) {
returnsError = true
}
}
if resultType != nil || returnsError {
g.Printf("_out = new go.Seq();\n")
}
if resultType != nil {
t := g.javaType(resultType)
g.Printf("%s _result;\n", t)
}
params := sig.Params()
if method || params.Len() > 0 {
g.Printf("_in = new go.Seq();\n")
}
if method {
g.Printf("_in.writeRef(ref);\n")
}
for i := 0; i < params.Len(); i++ {
p := params.At(i)
g.Printf("_in.write%s;\n", seqWrite(p.Type(), paramName(params, i)))
}
g.Printf("Seq.send(DESCRIPTOR, CALL_%s, _in, _out);\n", o.Name())
if resultType != nil {
g.genRead("_result", "_out", resultType)
}
if returnsError {
g.Printf(`String _err = _out.readString();
if (_err != null && !_err.isEmpty()) {
throw new Exception(_err);
}
`)
}
if resultType != nil {
g.Printf("return _result;\n")
}
g.Outdent()
g.Printf("}\n\n")
}
func GoProto(fn *types.Func) (string, string, string) {
pkgname := "package " + fn.Pkg().Name() + "\n"
imports := ""
signature := fn.Type().(*types.Signature)
sig := strings.TrimPrefix(signature.String(), "func(")
fnproto := "func " + fn.Name() + "(" + sig + "\n"
return pkgname, imports, fnproto
}
func isCallable(t *types.Func) bool {
// TODO(crawshaw): functions that are not implementable from
// another language may still be callable (for example, a
// returned value with an unexported type can be treated as
// an opaque value by the caller). This restriction could be
// lifted.
return isImplementable(t.Type().(*types.Signature))
}
func (g *JavaGen) genMethodInterfaceProxy(oName string, m *types.Func) {
if !g.isSigSupported(m.Type()) {
g.Printf("// skipped method %s with unsupported parameter or return types\n\n", oName)
return
}
sig := m.Type().(*types.Signature)
params := sig.Params()
res := sig.Results()
g.genInterfaceMethodSignature(m, oName, false, g.paramName)
g.Indent()
g.Printf("JNIEnv *env = go_seq_push_local_frame(%d);\n", params.Len())
g.Printf("jobject o = go_seq_from_refnum(env, refnum, proxy_class_%s_%s, proxy_class_%s_%s_cons);\n", g.pkgPrefix, oName, g.pkgPrefix, oName)
for i := 0; i < params.Len(); i++ {
pn := g.paramName(params, i)
g.genCToJava("_"+pn, pn, params.At(i).Type(), modeTransient)
}
if res.Len() > 0 && !isErrorType(res.At(0).Type()) {
t := res.At(0).Type()
g.Printf("%s res = (*env)->Call%sMethod(env, o, ", g.jniType(t), g.jniCallType(t))
} else {
g.Printf("(*env)->CallVoidMethod(env, o, ")
}
g.Printf("mid_%s_%s", oName, m.Name())
for i := 0; i < params.Len(); i++ {
g.Printf(", _%s", g.paramName(params, i))
}
g.Printf(");\n")
var retName string
if res.Len() > 0 {
var rets []string
t := res.At(0).Type()
if !isErrorType(t) {
g.genJavaToC("res", t, modeRetained)
retName = "_res"
rets = append(rets, retName)
}
if res.Len() == 2 || isErrorType(t) {
g.Printf("jobject exc = go_seq_get_exception(env);\n")
errType := types.Universe.Lookup("error").Type()
g.genJavaToC("exc", errType, modeRetained)
retName = "_exc"
rets = append(rets, "_exc")
}
if res.Len() > 1 {
g.Printf("cproxy%s_%s_%s_return sres = {\n", g.pkgPrefix, oName, m.Name())
g.Printf(" %s\n", strings.Join(rets, ", "))
g.Printf("};\n")
retName = "sres"
}
}
g.Printf("go_seq_pop_local_frame(env);\n")
if retName != "" {
g.Printf("return %s;\n", retName)
}
g.Outdent()
g.Printf("}\n\n")
}
func (g *ObjcGen) genFuncH(obj *types.Func) {
if !g.isSigSupported(obj.Type()) {
g.Printf("// skipped function %s with unsupported parameter or return types\n\n", obj.Name())
return
}
if s := g.funcSummary(nil, obj); s != nil {
g.Printf("FOUNDATION_EXPORT %s;\n", s.asFunc(g))
}
}
func (g *JavaGen) genJNIFuncBody(o *types.Func, sName string, jm *java.Func, isjava bool) {
sig := o.Type().(*types.Signature)
res := sig.Results()
if sName != "" {
g.Printf("int32_t o = go_seq_to_refnum_go(env, __this__);\n")
}
params := sig.Params()
first := 0
if isjava && params.Len() > 0 && params.At(0).Name() == "this" {
// Start after the implicit this argument.
first = 1
g.Printf("int32_t _%s = go_seq_to_refnum(env, __this__);\n", g.paramName(params, 0))
}
for i := first; i < params.Len(); i++ {
name := g.paramName(params, i)
g.genJavaToC(name, params.At(i).Type(), modeTransient)
}
resPrefix := ""
if res.Len() > 0 {
if res.Len() == 1 {
g.Printf("%s r0 = ", g.cgoType(res.At(0).Type()))
} else {
resPrefix = "res."
g.Printf("struct proxy%s_%s_%s_return res = ", g.pkgPrefix, sName, o.Name())
}
}
g.Printf("proxy%s_%s_%s(", g.pkgPrefix, sName, o.Name())
if sName != "" {
g.Printf("o")
}
// Pass all arguments, including the implicit this argument.
for i := 0; i < params.Len(); i++ {
if i > 0 || sName != "" {
g.Printf(", ")
}
g.Printf("_%s", g.paramName(params, i))
}
g.Printf(");\n")
for i := first; i < params.Len(); i++ {
g.genRelease(g.paramName(params, i), params.At(i).Type(), modeTransient)
}
for i := 0; i < res.Len(); i++ {
tn := fmt.Sprintf("_r%d", i)
t := res.At(i).Type()
g.genCToJava(tn, fmt.Sprintf("%sr%d", resPrefix, i), t, modeRetained)
}
// Go backwards so that any exception is thrown before
// the return.
for i := res.Len() - 1; i >= 0; i-- {
t := res.At(i).Type()
if !isErrorType(t) {
g.Printf("return _r%d;\n", i)
} else {
g.Printf("go_seq_maybe_throw_exception(env, _r%d);\n", i)
}
}
}
func (b *Builder) addFunction(u types.Universe, useName *types.Name, in *tc.Func) *types.Type {
name := tcFuncNameToName(in.String())
if useName != nil {
name = *useName
}
out := u.Function(name)
out.Kind = types.DeclarationOf
out.Underlying = b.walkType(u, nil, in.Type())
return out
}
func (g *goGen) genFunc(o *types.Func) {
if !g.isSigSupported(o.Type()) {
g.Printf("// skipped function %s with unsupported parameter or result types\n", o.Name())
return
}
g.genFuncSignature(o, "")
g.Indent()
g.genFuncBody(o, g.pkgName(g.Pkg))
g.Outdent()
g.Printf("}\n\n")
}
func (p *printer) printFunc(recvType types.Type, obj *types.Func) {
p.print("func ")
sig := obj.Type().(*types.Signature)
if recvType != nil {
p.print("(")
p.writeType(p.pkg, recvType)
p.print(") ")
}
p.print(obj.Name())
p.writeSignature(p.pkg, sig)
}
func (g *javaGen) genFuncSignature(o *types.Func, static, header bool) {
sig := o.Type().(*types.Signature)
res := sig.Results()
var returnsError bool
var ret string
switch res.Len() {
case 2:
if !isErrorType(res.At(1).Type()) {
g.errorf("second result value must be of type error: %s", o)
return
}
returnsError = true
ret = g.javaType(res.At(0).Type())
case 1:
if isErrorType(res.At(0).Type()) {
returnsError = true
ret = "void"
} else {
ret = g.javaType(res.At(0).Type())
}
case 0:
ret = "void"
default:
g.errorf("too many result values: %s", o)
return
}
g.Printf("public ")
if static {
g.Printf("static ")
}
if !header {
g.Printf("native ")
}
oName := o.Name()
g.Printf("%s %s(", ret, oName)
params := sig.Params()
for i := 0; i < params.Len(); i++ {
if i > 0 {
g.Printf(", ")
}
v := sig.Params().At(i)
name := paramName(params, i)
jt := g.javaType(v.Type())
g.Printf("%s %s", jt, name)
}
g.Printf(")")
if returnsError {
g.Printf(" throws Exception")
}
g.Printf(";\n")
}
func getParameters(ctx Ctx, fn *types.Func) []*ssaParam {
signature := fn.Type().(*types.Signature)
if signature.Recv() != nil {
panic("methods unsupported (only functions are supported)")
}
var params []*ssaParam
for i := 0; i < signature.Params().Len(); i++ {
param := signature.Params().At(i)
n := ssaParam{v: param, ctx: ctx}
params = append(params, &n)
}
return params
}
func getReturnVar(ctx Ctx, fn *types.Func) []*ssaRetVar {
signature := fn.Type().(*types.Signature)
if signature.Recv() != nil {
panic("methods unsupported (only functions are supported)")
}
var results []*ssaRetVar
for i := 0; i < signature.Results().Len(); i++ {
ret := signature.Results().At(i)
n := ssaRetVar{v: ret, ctx: ctx}
results = append(results, &n)
}
return results
}
func (g *JavaGen) genFuncSignature(o *types.Func, jm *java.Func, hasThis bool) {
sig := o.Type().(*types.Signature)
res := sig.Results()
var returnsError bool
var ret string
switch res.Len() {
case 2:
if !isErrorType(res.At(1).Type()) {
g.errorf("second result value must be of type error: %s", o)
return
}
returnsError = true
ret = g.javaType(res.At(0).Type())
case 1:
if isErrorType(res.At(0).Type()) {
returnsError = true
ret = "void"
} else {
ret = g.javaType(res.At(0).Type())
}
case 0:
ret = "void"
default:
g.errorf("too many result values: %s", o)
return
}
g.Printf("%s ", ret)
if jm != nil {
g.Printf(jm.Name)
} else {
g.Printf(javaNameReplacer(lowerFirst(o.Name())))
}
g.Printf("(")
g.genFuncArgs(o, jm, hasThis)
g.Printf(")")
if returnsError {
if jm != nil {
if jm.Throws == "" {
g.errorf("%s declares an error return value but the overriden method does not throw", o)
return
}
g.Printf(" throws %s", jm.Throws)
} else {
g.Printf(" throws Exception")
}
}
g.Printf(";\n")
}
func (g *goGen) genFuncBody(o *types.Func, selectorLHS string) {
sig := o.Type().(*types.Signature)
params := sig.Params()
for i := 0; i < params.Len(); i++ {
p := params.At(i)
pn := "param_" + g.paramName(params, i)
g.genRead("_"+pn, pn, p.Type(), modeTransient)
}
res := sig.Results()
if res.Len() > 2 || res.Len() == 2 && !isErrorType(res.At(1).Type()) {
g.errorf("functions and methods must return either zero or one values, and optionally an error")
return
}
if res.Len() > 0 {
for i := 0; i < res.Len(); i++ {
if i > 0 {
g.Printf(", ")
}
g.Printf("res_%d", i)
}
g.Printf(" := ")
}
g.Printf("%s%s(", selectorLHS, o.Name())
for i := 0; i < params.Len(); i++ {
if i > 0 {
g.Printf(", ")
}
g.Printf("_param_%s", g.paramName(params, i))
}
g.Printf(")\n")
for i := 0; i < res.Len(); i++ {
pn := fmt.Sprintf("res_%d", i)
g.genWrite("_"+pn, pn, res.At(i).Type(), modeRetained)
}
if res.Len() > 0 {
g.Printf("return ")
for i := 0; i < res.Len(); i++ {
if i > 0 {
g.Printf(", ")
}
g.Printf("_res_%d", i)
}
g.Printf("\n")
}
}
func (g *JavaGen) genJNIConstructor(f *types.Func, sName string) {
if !g.isSigSupported(f.Type()) {
return
}
sig := f.Type().(*types.Signature)
res := sig.Results()
g.Printf("JNIEXPORT jobject JNICALL\n")
g.Printf("Java_%s_%s_%s(JNIEnv *env, jclass clazz", g.jniPkgName(), sName, java.JNIMangle("__"+f.Name()))
params := sig.Params()
for i := 0; i < params.Len(); i++ {
v := params.At(i)
jt := g.jniType(v.Type())
g.Printf(", %s %s", jt, g.paramName(params, i))
}
g.Printf(") {\n")
g.Indent()
for i := 0; i < params.Len(); i++ {
name := g.paramName(params, i)
g.genJavaToC(name, params.At(i).Type(), modeTransient)
}
// Constructors always return a mandatory *T and an optional error
if res.Len() == 1 {
g.Printf("int32_t refnum = proxy%s__%s(", g.pkgPrefix, f.Name())
} else {
g.Printf("struct proxy%s__%s_return res = proxy%s__%s(", g.pkgPrefix, f.Name(), g.pkgPrefix, f.Name())
}
for i := 0; i < params.Len(); i++ {
if i > 0 {
g.Printf(", ")
}
g.Printf("_%s", g.paramName(params, i))
}
g.Printf(");\n")
for i := 0; i < params.Len(); i++ {
g.genRelease(g.paramName(params, i), params.At(i).Type(), modeTransient)
}
// Extract multi returns and handle errors
if res.Len() == 2 {
g.Printf("int32_t refnum = res.r0;\n")
g.genCToJava("_err", "res.r1", res.At(1).Type(), modeRetained)
g.Printf("go_seq_maybe_throw_exception(env, _err);\n")
}
// Pass no proxy class so that the Seq.Ref is returned instead.
g.Printf("return go_seq_from_refnum(env, refnum, NULL, NULL);\n")
g.Outdent()
g.Printf("}\n\n")
}
func (p *exporter) method(m *types.Func) {
sig := m.Type().(*types.Signature)
if sig.Recv() == nil {
log.Fatalf("gcimporter: method expected")
}
p.pos(m)
p.string(m.Name())
if m.Name() != "_" && !ast.IsExported(m.Name()) {
p.pkg(m.Pkg(), false)
}
// interface method; no need to encode receiver.
p.paramList(sig.Params(), sig.Variadic())
p.paramList(sig.Results(), false)
}
func (c *converter) convertFunc(v *gotypes.Func) *types.Func {
if v == nil {
return nil
}
if v, ok := c.converted[v]; ok {
return v.(*types.Func)
}
ret := types.NewFunc(
token.Pos(v.Pos()),
c.ret,
v.Name(),
c.convertSignature(v.Type().(*gotypes.Signature)),
)
c.converted[v] = ret
return ret
}
func (g *javaGen) genJNIFuncSignature(o *types.Func, sName string, proxy bool) {
sig := o.Type().(*types.Signature)
res := sig.Results()
var ret string
switch res.Len() {
case 2:
ret = g.jniType(res.At(0).Type())
case 1:
if isErrorType(res.At(0).Type()) {
ret = "void"
} else {
ret = g.jniType(res.At(0).Type())
}
case 0:
ret = "void"
default:
g.errorf("too many result values: %s", o)
return
}
g.Printf("JNIEXPORT %s JNICALL\n", ret)
g.Printf("Java_%s_%s", g.jniPkgName(), g.className())
if sName != "" {
// 0024 is the mangled form of $, for naming inner classes.
g.Printf("_00024")
if proxy {
g.Printf("proxy")
}
g.Printf("%s", sName)
}
g.Printf("_%s(JNIEnv* env, ", o.Name())
if sName != "" {
g.Printf("jobject this")
} else {
g.Printf("jclass clazz")
}
params := sig.Params()
for i := 0; i < params.Len(); i++ {
g.Printf(", ")
v := sig.Params().At(i)
name := paramName(params, i)
jt := g.jniType(v.Type())
g.Printf("%s %s", jt, name)
}
g.Printf(")")
}
func (g *JavaGen) genJNIFunc(o *types.Func, sName string, jm *java.Func, proxy, isjava bool) {
if !g.isSigSupported(o.Type()) {
n := o.Name()
if sName != "" {
n = sName + "." + n
}
g.Printf("// skipped function %s with unsupported parameter or return types\n\n", n)
return
}
g.genJNIFuncSignature(o, sName, jm, proxy, isjava)
g.Printf(" {\n")
g.Indent()
g.genJNIFuncBody(o, sName, jm, isjava)
g.Outdent()
g.Printf("}\n\n")
}
func (g *goGen) genFuncBody(o *types.Func, selectorLHS string) {
sig := o.Type().(*types.Signature)
params := sig.Params()
for i := 0; i < params.Len(); i++ {
p := params.At(i)
g.genRead("param_"+paramName(params, i), "in", p.Type())
}
res := sig.Results()
if res.Len() > 2 || res.Len() == 2 && !isErrorType(res.At(1).Type()) {
g.errorf("functions and methods must return either zero or one values, and optionally an error")
return
}
returnsValue := false
returnsError := false
if res.Len() == 1 {
if isErrorType(res.At(0).Type()) {
returnsError = true
g.Printf("err := ")
} else {
returnsValue = true
g.Printf("res := ")
}
} else if res.Len() == 2 {
returnsValue = true
returnsError = true
g.Printf("res, err := ")
}
g.Printf("%s.%s(", selectorLHS, o.Name())
for i := 0; i < params.Len(); i++ {
if i > 0 {
g.Printf(", ")
}
g.Printf("param_%s", paramName(params, i))
}
g.Printf(")\n")
if returnsValue {
g.genWrite("res", "out", res.At(0).Type())
}
if returnsError {
g.genWrite("err", "out", res.At(res.Len()-1).Type())
}
}
// genFuncArgs generated Java function arguments declaration for the function f.
// If the supplied overridden java function is supplied, genFuncArgs omits the implicit
// this argument.
func (g *JavaGen) genFuncArgs(f *types.Func, jm *java.Func, hasThis bool) {
sig := f.Type().(*types.Signature)
params := sig.Params()
first := 0
if hasThis {
// Skip the implicit this argument to the Go method
first = 1
}
for i := first; i < params.Len(); i++ {
if i > first {
g.Printf(", ")
}
v := params.At(i)
name := g.paramName(params, i)
jt := g.javaType(v.Type())
g.Printf("%s %s", jt, name)
}
}
func checkFuncValue(t *testing.T, prog *ssa.Program, obj *types.Func) {
fn := prog.FuncValue(obj)
// fmt.Printf("FuncValue(%s) = %s\n", obj, fn) // debugging
if fn == nil {
if obj.Name() != "interfaceMethod" {
t.Errorf("FuncValue(%s) == nil", obj)
}
return
}
if fnobj := fn.Object(); fnobj != obj {
t.Errorf("FuncValue(%s).Object() == %s; value was %s",
obj, fnobj, fn.Name())
return
}
if !types.Identical(fn.Type(), obj.Type()) {
t.Errorf("FuncValue(%s).Type() == %s", obj, fn.Type())
return
}
}
// makeBound returns a bound method wrapper (or "bound"), a synthetic
// function that delegates to a concrete or interface method denoted
// by obj. The resulting function has no receiver, but has one free
// variable which will be used as the method's receiver in the
// tail-call.
//
// Use MakeClosure with such a wrapper to construct a bound method
// closure. e.g.:
//
// type T int or: type T interface { meth() }
// func (t T) meth()
// var t T
// f := t.meth
// f() // calls t.meth()
//
// f is a closure of a synthetic wrapper defined as if by:
//
// f := func() { return t.meth() }
//
// Unlike makeWrapper, makeBound need perform no indirection or field
// selections because that can be done before the closure is
// constructed.
//
// EXCLUSIVE_LOCKS_ACQUIRED(meth.Prog.methodsMu)
//
func makeBound(prog *Program, obj *types.Func) *Function {
prog.methodsMu.Lock()
defer prog.methodsMu.Unlock()
fn, ok := prog.bounds[obj]
if !ok {
description := fmt.Sprintf("bound method wrapper for %s", obj)
if prog.mode&LogSource != 0 {
defer logStack("%s", description)()
}
fn = &Function{
name: obj.Name() + "$bound",
object: obj,
Signature: changeRecv(obj.Type().(*types.Signature), nil), // drop receiver
Synthetic: description,
Prog: prog,
pos: obj.Pos(),
}
fv := &FreeVar{name: "recv", typ: recvType(obj), parent: fn}
fn.FreeVars = []*FreeVar{fv}
fn.startBody()
createParams(fn, 0)
var c Call
if !isInterface(recvType(obj)) { // concrete
c.Call.Value = prog.declaredFunc(obj)
c.Call.Args = []Value{fv}
} else {
c.Call.Value = fv
c.Call.Method = obj
}
for _, arg := range fn.Params {
c.Call.Args = append(c.Call.Args, arg)
}
emitTailCall(fn, &c)
fn.finishBody()
prog.bounds[obj] = fn
}
return fn
}
// constructorType returns the type T for a function of the forms:
//
// func NewT...(...) *T
// func NewT...(...) (*T, error)
func (g *Generator) constructorType(f *types.Func) *types.TypeName {
sig := f.Type().(*types.Signature)
res := sig.Results()
if res.Len() != 1 && !(res.Len() == 2 && isErrorType(res.At(1).Type())) {
return nil
}
rt := res.At(0).Type()
pt, ok := rt.(*types.Pointer)
if !ok {
return nil
}
nt, ok := pt.Elem().(*types.Named)
if !ok {
return nil
}
obj := nt.Obj()
if !strings.HasPrefix(f.Name(), "New"+obj.Name()) {
return nil
}
return obj
}
func (g *generator) genInterfaceMethodSignature(m *types.Func, iName string, header bool) {
sig := m.Type().(*types.Signature)
params := sig.Params()
res := sig.Results()
if res.Len() == 0 {
g.Printf("void ")
} else {
if res.Len() == 1 {
g.Printf("%s ", g.cgoType(res.At(0).Type()))
} else {
if header {
g.Printf("typedef struct cproxy%s_%s_%s_return {\n", g.pkgPrefix, iName, m.Name())
g.Indent()
for i := 0; i < res.Len(); i++ {
t := res.At(i).Type()
g.Printf("%s r%d;\n", g.cgoType(t), i)
}
g.Outdent()
g.Printf("} cproxy%s_%s_%s_return;\n", g.pkgPrefix, iName, m.Name())
}
g.Printf("struct cproxy%s_%s_%s_return ", g.pkgPrefix, iName, m.Name())
}
}
g.Printf("cproxy%s_%s_%s(int32_t refnum", g.pkgPrefix, iName, m.Name())
for i := 0; i < params.Len(); i++ {
t := params.At(i).Type()
g.Printf(", %s %s", g.cgoType(t), paramName(params, i))
}
g.Printf(")")
if header {
g.Printf(";\n")
} else {
g.Printf(" {\n")
}
}