func (g *goGen) genFunc(o *types.Func) {
sig := o.Type().(*types.Signature)
params := "(" + g.tupleString(sig.Params()) + ")"
ret := g.tupleString(sig.Results())
if sig.Results().Len() > 1 {
ret = "(" + ret + ") "
} else {
ret += " "
}
//funcName := o.Name()
g.Printf(`
//export GoPy_%[1]s
// GoPy_%[1]s wraps %[2]s
func GoPy_%[1]s%[3]v%[4]v{
`,
o.Name(), o.FullName(),
params,
ret,
)
g.Indent()
g.genFuncBody(o)
g.Outdent()
g.Printf("}\n\n")
}
// interfaceMethod returns a function and receiver pointer for the specified
// interface and method pair.
func (fr *frame) interfaceMethod(lliface llvm.Value, ifacety types.Type, method *types.Func) (fn, recv *govalue) {
llitab := fr.builder.CreateExtractValue(lliface, 0, "")
recv = newValue(fr.builder.CreateExtractValue(lliface, 1, ""), types.Typ[types.UnsafePointer])
methodset := fr.types.MethodSet(ifacety)
// TODO(axw) cache ordered method index
index := -1
for i, m := range orderedMethodSet(methodset) {
if m.Obj() == method {
index = i
break
}
}
if index == -1 {
panic("could not find method index")
}
llitab = fr.builder.CreateBitCast(llitab, llvm.PointerType(llvm.PointerType(llvm.Int8Type(), 0), 0), "")
// Skip runtime type pointer.
llifnptr := fr.builder.CreateGEP(llitab, []llvm.Value{
llvm.ConstInt(llvm.Int32Type(), uint64(index+1), false),
}, "")
llifn := fr.builder.CreateLoad(llifnptr, "")
// Replace receiver type with unsafe.Pointer.
recvparam := types.NewParam(0, nil, "", types.Typ[types.UnsafePointer])
sig := method.Type().(*types.Signature)
sig = types.NewSignature(nil, recvparam, sig.Params(), sig.Results(), sig.Variadic())
fn = newValue(llifn, sig)
return
}
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)
t := seqType(p.Type())
if t == "Ref" {
name := p.Type().(*types.Named).Obj().Name()
g.Printf("var param_%s %s.%s\n", p.Name(), g.pkg.Name(), name)
g.Printf("param_%s_ref := in.ReadRef()\n", p.Name())
g.Printf("if param_%s_ref.Num < 0 {\n", p.Name())
g.Printf(" param_%s = param_%s_ref.Get().(%s.%s)\n", p.Name(), p.Name(), g.pkg.Name(), name)
g.Printf("} else {\n")
g.Printf(" param_%s = (*proxy%s)(param_%s_ref)\n", p.Name(), name, p.Name())
g.Printf("}\n")
} else {
g.Printf("param_%s := in.Read%s()\n", p.Name(), t)
}
}
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", params.At(i).Name())
}
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())
}
}
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) 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 = new go.Seq();\n")
g.Printf("go.Seq _out = new go.Seq();\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 {
t := g.javaType(resultType)
g.Printf("%s _result;\n", t)
}
if method {
g.Printf("_in.writeRef(ref);\n")
}
params := sig.Params()
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) {
throw new Exception(_err);
}
`)
}
if resultType != nil {
g.Printf("return _result;\n")
}
g.Outdent()
g.Printf("}\n\n")
}
// check if function is a test function for the testing package
// we don't unexport those
func (e *Export) checkFunction(from *types.Func, to string) {
if !strings.HasPrefix(from.Name(), "Test") {
return
}
sig := from.Type().(*types.Signature)
if sig.Params().Len() != 1 {
return
}
if sig.Params().At(0).Type().String() == "*testing.T" {
e.Conflicting = true
return
}
}
func (g *goGen) genFuncBody(o *types.Func) {
sig := o.Type().(*types.Signature)
results := newVars(sig.Results())
for i := range results {
if i > 0 {
g.Printf(", ")
}
g.Printf("_gopy_%03d", i)
}
if len(results) > 0 {
g.Printf(" := ")
}
g.Printf("%s.%s(", g.pkg.Name(), o.Name())
args := sig.Params()
for i := 0; i < args.Len(); i++ {
arg := args.At(i)
tail := ""
if i+1 < args.Len() {
tail = ", "
}
g.Printf("%s%s", arg.Name(), tail)
}
g.Printf(")\n")
if len(results) <= 0 {
return
}
g.Printf("return ")
for i, res := range results {
if i > 0 {
g.Printf(", ")
}
// if needWrap(res.GoType()) {
// g.Printf("")
// }
if res.needWrap() {
g.Printf("%s(unsafe.Pointer(&", res.dtype.cgotype)
}
g.Printf("_gopy_%03d /* %#v %v */", i, res, res.GoType().Underlying())
if res.needWrap() {
g.Printf("))")
}
}
g.Printf("\n")
}
func (g *javaGen) funcSignature(o *types.Func, static bool) error {
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()) {
return fmt.Errorf("second result value must be of type error: %s", o)
}
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:
return fmt.Errorf("too many result values: %s", o)
}
g.Printf("public ")
if static {
g.Printf("static ")
}
g.Printf("%s %s(", ret, o.Name())
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")
}
return nil
}
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())
}
}
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
}
func (p *Processor) tryMatchNewFunc(models []*Model, fun *types.Func) {
modelName := fun.Name()[len("new"):]
for _, m := range models {
if m.Name != modelName {
continue
}
sig := fun.Type().(*types.Signature)
if sig.Recv() != nil {
continue
}
res := sig.Results()
for i := 0; i < res.Len(); i++ {
if isTypeOrPtrTo(res.At(i).Type(), m.CheckedNode) {
m.NewFunc = fun
return
}
}
}
}
// recv returns the method's receiver.
func recv(meth *types.Func) *types.Var {
return meth.Type().(*types.Signature).Recv()
}
func (g *objcGen) funcSummary(obj *types.Func) *funcSummary {
s := &funcSummary{name: obj.Name()}
sig := obj.Type().(*types.Signature)
params := sig.Params()
for i := 0; i < params.Len(); i++ {
p := params.At(i)
v := paramInfo{
typ: p.Type(),
name: paramName(params, i),
}
s.params = append(s.params, v)
}
res := sig.Results()
switch res.Len() {
case 0:
s.ret = "void"
case 1:
p := res.At(0)
if isErrorType(p.Type()) {
s.retParams = append(s.retParams, paramInfo{
typ: p.Type(),
name: "error",
})
s.ret = "BOOL"
} else {
name := p.Name()
if name == "" || paramRE.MatchString(name) {
name = "ret0_"
}
typ := p.Type()
s.retParams = append(s.retParams, paramInfo{typ: typ, name: name})
s.ret = g.objcType(typ)
}
case 2:
name := res.At(0).Name()
if name == "" || paramRE.MatchString(name) {
name = "ret0_"
}
s.retParams = append(s.retParams, paramInfo{
typ: res.At(0).Type(),
name: name,
})
if !isErrorType(res.At(1).Type()) {
g.errorf("second result value must be of type error: %s", obj)
return nil
}
s.retParams = append(s.retParams, paramInfo{
typ: res.At(1).Type(),
name: "error", // TODO(hyangah): name collision check.
})
s.ret = "BOOL"
default:
// TODO(hyangah): relax the constraint on multiple return params.
g.errorf("too many result values: %s", obj)
return nil
}
return s
}
// recvType returns the receiver type of method obj.
func recvType(obj *types.Func) types.Type {
return obj.Type().(*types.Signature).Recv().Type()
}
// checkMethod performs safety checks for renaming a method.
// There are three hazards:
// - declaration conflicts
// - selection ambiguity/changes
// - entailed renamings of assignable concrete/interface types (for now, just reject)
func (r *renamer) checkMethod(from *types.Func) {
// e.g. error.Error
if from.Pkg() == nil {
r.errorf(from.Pos(), "you cannot rename built-in method %s", from)
return
}
// As always, having to support concrete methods with pointer
// and non-pointer receivers, and named vs unnamed types with
// methods, makes tooling fun.
// ASSIGNABILITY
//
// For now, if any method renaming breaks a required
// assignability to another type, we reject it.
//
// TODO(adonovan): probably we should compute the entailed
// renamings so that an interface method renaming causes
// concrete methods to change too. But which ones?
//
// There is no correct answer, only heuristics, because Go's
// "duck typing" doesn't distinguish intentional from contingent
// assignability. There are two obvious approaches:
//
// (1) Update the minimum set of types to preserve the
// assignability of types all syntactic assignments
// (incl. implicit ones in calls, returns, sends, etc).
// The satisfy.Finder enumerates these.
// This is likely to be an underapproximation.
//
// (2) Update all types that are assignable to/from the changed
// type. This requires computing the "implements" relation
// for all pairs of types (as godoc and oracle do).
// This is likely to be an overapproximation.
//
// If a concrete type is renamed, we probably do not want to
// rename corresponding interfaces; interface renamings should
// probably be initiated at the interface. (But what if a
// concrete type implements multiple interfaces with the same
// method? Then the user is stuck.)
//
// We need some experience before we decide how to implement this.
// Check for conflict at point of declaration.
// Check to ensure preservation of assignability requirements.
recv := from.Type().(*types.Signature).Recv().Type()
if isInterface(recv) {
// Abstract method
// declaration
prev, _, _ := types.LookupFieldOrMethod(recv, false, from.Pkg(), r.to)
if prev != nil {
r.errorf(from.Pos(), "renaming this interface method %q to %q",
from.Name(), r.to)
r.errorf(prev.Pos(), "\twould conflict with this method")
return
}
// Check all interfaces that embed this one for
// declaration conflicts too.
for _, info := range r.packages {
// Start with named interface types (better errors)
for _, obj := range info.Defs {
if obj, ok := obj.(*types.TypeName); ok && isInterface(obj.Type()) {
f, _, _ := types.LookupFieldOrMethod(
obj.Type(), false, from.Pkg(), from.Name())
if f == nil {
continue
}
t, _, _ := types.LookupFieldOrMethod(
obj.Type(), false, from.Pkg(), r.to)
if t == nil {
continue
}
r.errorf(from.Pos(), "renaming this interface method %q to %q",
from.Name(), r.to)
r.errorf(t.Pos(), "\twould conflict with this method")
r.errorf(obj.Pos(), "\tin named interface type %q", obj.Name())
}
}
// Now look at all literal interface types (includes named ones again).
for e, tv := range info.Types {
if e, ok := e.(*ast.InterfaceType); ok {
_ = e
_ = tv.Type.(*types.Interface)
// TODO(adonovan): implement same check as above.
}
}
}
// assignability
for T := range r.findAssignments(recv) {
if obj, _, _ := types.LookupFieldOrMethod(T, false, from.Pkg(), from.Name()); obj == nil {
continue
}
r.errorf(from.Pos(), "renaming this method %q to %q",
from.Name(), r.to)
var pos token.Pos
var other string
if named, ok := T.(*types.Named); ok {
pos = named.Obj().Pos()
other = named.Obj().Name()
} else {
pos = from.Pos()
other = T.String()
}
r.errorf(pos, "\twould make %s no longer assignable to it", other)
return
}
} else {
// Concrete method
// declaration
prev, indices, _ := types.LookupFieldOrMethod(recv, true, from.Pkg(), r.to)
if prev != nil && len(indices) == 1 {
r.errorf(from.Pos(), "renaming this method %q to %q",
from.Name(), r.to)
r.errorf(prev.Pos(), "\twould conflict with this %s",
objectKind(prev))
return
}
// assignability (of both T and *T)
recvBase := deref(recv)
for _, R := range []types.Type{recvBase, types.NewPointer(recvBase)} {
for I := range r.findAssignments(R) {
if obj, _, _ := types.LookupFieldOrMethod(I, true, from.Pkg(), from.Name()); obj == nil {
continue
}
r.errorf(from.Pos(), "renaming this method %q to %q",
from.Name(), r.to)
var pos token.Pos
var iface string
if named, ok := I.(*types.Named); ok {
pos = named.Obj().Pos()
iface = "interface " + named.Obj().Name()
} else {
pos = from.Pos()
iface = I.String()
}
r.errorf(pos, "\twould make it no longer assignable to %s", iface)
return // one is enough
}
}
}
// Check integrity of existing (field and method) selections.
// We skip this if there were errors above, to avoid redundant errors.
r.checkSelections(from)
}
func (g *cpyGen) genFuncBody(o *types.Func) {
funcArgs := []string{}
sig := o.Type().(*types.Signature)
res := newVars(sig.Results())
args := newVars(sig.Params())
for _, arg := range args {
arg.genDecl(g.impl)
funcArgs = append(funcArgs, arg.getFuncArg())
}
// FIXME(sbinet) pythonize (turn errors into python exceptions)
if len(res) > 0 {
switch len(res) {
case 1:
ret := res[0]
ret.genRetDecl(g.impl)
default:
g.impl.Printf("struct %[1]s_return c_gopy_ret;\n", o.Name())
/*
for i := 0; i < res.Len(); i++ {
ret := res.At(i)
n := ret.Name()
if n == "" {
n = "gopy_" + strconv.Itoa(i)
}
g.impl.Printf("%[1]s c_%[2]s;\n", ctypeName(ret.Type()), n)
}
*/
}
}
g.impl.Printf("\n")
if len(args) > 0 {
g.impl.Printf("if (!PyArg_ParseTuple(args, ")
format := []string{}
pyaddrs := []string{}
for _, arg := range args {
pyfmt, addr := arg.getArgParse()
format = append(format, pyfmt)
pyaddrs = append(pyaddrs, addr)
}
g.impl.Printf("%q, %s)) {\n", strings.Join(format, ""), strings.Join(pyaddrs, ", "))
g.impl.Indent()
g.impl.Printf("return NULL;\n")
g.impl.Outdent()
g.impl.Printf("}\n\n")
}
if len(args) > 0 {
for _, arg := range args {
arg.genFuncPreamble(g.impl)
}
g.impl.Printf("\n")
}
if len(res) > 0 {
g.impl.Printf("c_gopy_ret = ")
}
g.impl.Printf("GoPy_%[1]s(%[2]s);\n", o.Name(), strings.Join(funcArgs, ", "))
g.impl.Printf("\n")
if len(res) <= 0 {
g.impl.Printf("Py_INCREF(Py_None);\nreturn Py_None;\n")
return
}
format := []string{}
funcArgs = []string{}
switch len(res) {
case 1:
ret := res[0]
pyfmt, _ := ret.getArgParse()
format = append(format, pyfmt)
funcArgs = append(funcArgs, "c_gopy_ret")
default:
for _, ret := range res {
pyfmt, _ := ret.getArgParse()
format = append(format, pyfmt)
funcArgs = append(funcArgs, ret.getFuncArg())
}
}
g.impl.Printf("return Py_BuildValue(%q, %s);\n",
strings.Join(format, ""),
strings.Join(funcArgs, ", "),
)
//g.impl.Printf("return NULL;\n")
}