Golang types.Func类代码示例

func (g *goGen) genFunc(o *types.Func) {
	g.Printf("func proxy_%s(out, in *seq.Buffer) {\n", o.Name())
	g.Indent()
	g.genFuncBody(o, g.pkg.Name())
	g.Outdent()
	g.Printf("}\n\n")
}

func findMethod(prog *ssa.Program, meth *types.Func, typ types.Type, infer *TypeInfer) *ssa.Function {
	if meth != nil {
		return prog.LookupMethod(typ, meth.Pkg(), meth.Name())
	}
	infer.Logger.Fatal(ErrMethodNotFound)
	return nil
}

// 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 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 *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 (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 (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 *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 (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 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 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 (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 *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 getLocalDecls(ctx Ctx, fnDecl *ast.FuncDecl, fn *types.Func) []*ssaLocal {
	scope := fn.Scope()
	names := scope.Names()
	var locals []*ssaLocal
	for i := 0; i < len(names); i++ {
		name := names[i]
		obj := scope.Lookup(name)
		if isParam(ctx, fn, obj) {
			continue
		}
		node := ssaLocal{obj: obj, ctx: ctx}
		locals = append(locals, &node)
	}
	return locals
}