func (p *exporter) signature(sig *types.Signature) {
// We need the receiver information (T vs *T)
// for methods associated with named types.
// We do not record interface receiver types in the
// export data because 1) the importer can derive them
// from the interface type and 2) they create cycles
// in the type graph.
if recv := sig.Recv(); recv != nil {
if _, ok := recv.Type().Underlying().(*types.Interface); !ok {
// 1-element tuple
p.int(1)
p.param(recv)
} else {
// 0-element tuple
p.int(0)
}
} else {
// 0-element tuple
p.int(0)
}
p.tuple(sig.Params())
p.tuple(sig.Results())
if sig.Variadic() {
p.int(1)
} else {
p.int(0)
}
}
func (tm *LLVMTypeMap) funcLLVMType(tstr string, f *types.Signature) llvm.Type {
typ, ok := tm.types[tstr]
if !ok {
// If there's a receiver change the receiver to an
// additional (first) parameter, and take the value of
// the resulting signature instead.
var param_types []llvm.Type
if recv := f.Recv(); recv != nil {
params := f.Params()
paramvars := make([]*types.Var, int(params.Len()+1))
paramvars[0] = recv
for i := 0; i < int(params.Len()); i++ {
paramvars[i+1] = params.At(i)
}
params = types.NewTuple(paramvars...)
f := types.NewSignature(nil, params, f.Results(), f.IsVariadic())
return tm.ToLLVM(f)
}
typ = llvm.GlobalContext().StructCreateNamed("")
tm.types[tstr] = typ
params := f.Params()
nparams := int(params.Len())
for i := 0; i < nparams; i++ {
typ := params.At(i).Type()
if f.IsVariadic() && i == nparams-1 {
typ = types.NewSlice(typ)
}
llvmtyp := tm.ToLLVM(typ)
param_types = append(param_types, llvmtyp)
}
var return_type llvm.Type
results := f.Results()
switch nresults := int(results.Len()); nresults {
case 0:
return_type = llvm.VoidType()
case 1:
return_type = tm.ToLLVM(results.At(0).Type())
default:
elements := make([]llvm.Type, nresults)
for i := range elements {
result := results.At(i)
elements[i] = tm.ToLLVM(result.Type())
}
return_type = llvm.StructType(elements, false)
}
fntyp := llvm.FunctionType(return_type, param_types, false)
fnptrtyp := llvm.PointerType(fntyp, 0)
i8ptr := llvm.PointerType(llvm.Int8Type(), 0)
elements := []llvm.Type{fnptrtyp, i8ptr} // func, closure
typ.StructSetBody(elements, false)
}
return typ
}
// changeRecv returns sig with Recv prepended to Params().
func changeRecv(sig *types.Signature) *types.Signature {
params := sig.Params()
n := params.Len()
p2 := make([]*types.Var, n+1)
p2[0] = sig.Recv()
for i := 0; i < n; i++ {
p2[i+1] = params.At(i)
}
return types.NewSignature(nil, nil, types.NewTuple(p2...), sig.Results(), sig.IsVariadic())
}
func (tm *llvmTypeMap) funcLLVMType(f *types.Signature, name string) llvm.Type {
// If there's a receiver change the receiver to an
// additional (first) parameter, and take the value of
// the resulting signature instead.
if recv := f.Recv(); recv != nil {
params := f.Params()
paramvars := make([]*types.Var, int(params.Len()+1))
paramvars[0] = recv
for i := 0; i < int(params.Len()); i++ {
paramvars[i+1] = params.At(i)
}
params = types.NewTuple(paramvars...)
f := types.NewSignature(nil, nil, params, f.Results(), f.Variadic())
return tm.toLLVM(f, name)
}
if typ, ok := tm.types.At(f).(llvm.Type); ok {
return typ
}
typ := llvm.GlobalContext().StructCreateNamed(name)
tm.types.Set(f, typ)
params := f.Params()
param_types := make([]llvm.Type, params.Len())
for i := range param_types {
llvmtyp := tm.ToLLVM(params.At(i).Type())
param_types[i] = llvmtyp
}
var return_type llvm.Type
results := f.Results()
switch nresults := int(results.Len()); nresults {
case 0:
return_type = llvm.VoidType()
case 1:
return_type = tm.ToLLVM(results.At(0).Type())
default:
elements := make([]llvm.Type, nresults)
for i := range elements {
result := results.At(i)
elements[i] = tm.ToLLVM(result.Type())
}
return_type = llvm.StructType(elements, false)
}
fntyp := llvm.FunctionType(return_type, param_types, false)
fnptrtyp := llvm.PointerType(fntyp, 0)
i8ptr := llvm.PointerType(llvm.Int8Type(), 0)
elements := []llvm.Type{fnptrtyp, i8ptr} // func, closure
typ.StructSetBody(elements, false)
return typ
}
func (w *Walker) writeSignature(buf *bytes.Buffer, sig *types.Signature) {
w.writeParams(buf, sig.Params(), sig.IsVariadic())
switch res := sig.Results(); res.Len() {
case 0:
// nothing to do
case 1:
buf.WriteByte(' ')
w.writeType(buf, res.At(0).Type())
default:
buf.WriteByte(' ')
w.writeParams(buf, res, false)
}
}
func (cdd *CDD) signature(sig *types.Signature, recv bool, pnames int) (res results, params string) {
params = "("
res = cdd.results(sig.Results())
if r := sig.Recv(); r != nil && recv {
typ, dim, acds := cdd.TypeStr(r.Type())
res.acds = append(res.acds, acds...)
var pname string
switch pnames {
case numNames:
pname = "_0"
case orgNames:
pname = cdd.NameStr(r, true)
}
if pname == "" {
params += typ + dimFuncPtr("", dim)
} else {
params += typ + " " + dimFuncPtr(pname, dim)
}
if sig.Params() != nil {
params += ", "
}
}
if p := sig.Params(); p != nil {
for i, n := 0, p.Len(); i < n; i++ {
if i != 0 {
params += ", "
}
v := p.At(i)
typ, dim, acds := cdd.TypeStr(v.Type())
res.acds = append(res.acds, acds...)
var pname string
switch pnames {
case numNames:
pname = "_" + strconv.Itoa(i+1)
case orgNames:
pname = cdd.NameStr(v, true)
if pname == "_$" {
pname = "unused" + cdd.gtc.uniqueId()
}
}
if pname == "" {
params += typ + dimFuncPtr("", dim)
} else {
params += typ + " " + dimFuncPtr(pname, dim)
}
}
}
params += ")"
return
}
func (m *TypeMap) descriptorSignature(t *types.Signature, name string) TypeDebugDescriptor {
// If there's a receiver change the receiver to an
// additional (first) parameter, and take the value of
// the resulting signature instead.
if recv := t.Recv(); recv != nil {
params := t.Params()
paramvars := make([]*types.Var, int(params.Len()+1))
paramvars[0] = recv
for i := 0; i < int(params.Len()); i++ {
paramvars[i+1] = params.At(i)
}
params = types.NewTuple(paramvars...)
t := types.NewSignature(nil, nil, params, t.Results(), t.Variadic())
return m.typeDebugDescriptor(t, name)
}
if dt, ok := m.m.At(t).(TypeDebugDescriptor); ok {
return dt
}
var returnType DebugDescriptor
var paramTypes []DebugDescriptor
if results := t.Results(); results.Len() == 1 {
returnType = m.TypeDebugDescriptor(results.At(0).Type())
} else if results != nil {
fields := make([]DebugDescriptor, results.Len())
for i := range fields {
fields[i] = m.TypeDebugDescriptor(results.At(i).Type())
}
returnType = NewStructCompositeType(fields)
}
if params := t.Params(); params != nil && params.Len() > 0 {
paramTypes = make([]DebugDescriptor, params.Len())
for i := range paramTypes {
paramTypes[i] = m.TypeDebugDescriptor(params.At(i).Type())
}
}
ct := NewStructCompositeType([]DebugDescriptor{
NewSubroutineCompositeType(returnType, paramTypes),
m.TypeDebugDescriptor(types.NewPointer(types.Typ[types.Uint8])),
})
ct.Name = name
m.m.Set(t, ct)
return ct
}
func (p *printer) writeSignatureInternal(this *types.Package, sig *types.Signature, visited []types.Type) {
p.writeTuple(this, sig.Params(), sig.Variadic(), visited)
res := sig.Results()
n := res.Len()
if n == 0 {
// no result
return
}
p.print(" ")
if n == 1 && res.At(0).Name() == "" {
// single unnamed result
p.writeTypeInternal(this, res.At(0).Type(), visited)
return
}
// multiple or named result(s)
p.writeTuple(this, res, false, visited)
}
func (tm *TypeMap) funcRuntimeType(f *types.Signature) (global, ptr llvm.Value) {
rtype := tm.makeRtype(f, reflect.Func)
funcType := llvm.ConstNull(tm.runtime.funcType.llvm)
global, ptr = tm.makeRuntimeTypeGlobal(funcType, typeString(f))
tm.types.Set(f, runtimeTypeInfo{global, ptr})
funcType = llvm.ConstInsertValue(funcType, rtype, []uint32{0})
// dotdotdot
if f.Variadic() {
variadic := llvm.ConstInt(llvm.Int1Type(), 1, false)
funcType = llvm.ConstInsertValue(funcType, variadic, []uint32{1})
}
// in
intypes := tm.rtypeSlice(f.Params())
funcType = llvm.ConstInsertValue(funcType, intypes, []uint32{2})
// out
outtypes := tm.rtypeSlice(f.Results())
funcType = llvm.ConstInsertValue(funcType, outtypes, []uint32{3})
global.SetInitializer(funcType)
return global, ptr
}
func (v funcTypeVisitor) Visit(node ast.Node) ast.Visitor {
var sig *types.Signature
var noderecv *ast.FieldList
var astfunc *ast.FuncType
switch node := node.(type) {
case *ast.FuncDecl:
sig = v.objects[node.Name].Type().(*types.Signature)
astfunc = node.Type
noderecv = node.Recv
case *ast.FuncLit:
sig = v.exprtypes[node].Type.(*types.Signature)
astfunc = node.Type
default:
return v
}
// go/types creates a separate types.Var for
// internal and external usage. We need to
// associate them at the object data level.
paramIdents := fieldlistIdents(astfunc.Params)
resultIdents := fieldlistIdents(astfunc.Results)
if recv := sig.Recv(); recv != nil {
id := fieldlistIdents(noderecv)[0]
if obj, ok := v.objects[id]; ok {
v.objectdata[recv] = v.objectdata[obj]
}
}
for i, id := range paramIdents {
if obj, ok := v.objects[id]; ok {
v.objectdata[sig.Params().At(i)] = v.objectdata[obj]
}
}
for i, id := range resultIdents {
if obj, ok := v.objects[id]; ok {
v.objectdata[sig.Results().At(i)] = v.objectdata[obj]
}
}
return v
}
// writeSignature writes to w the signature sig in declaration syntax.
// Derived from types.Signature.String().
//
func writeSignature(w io.Writer, name string, sig *types.Signature, params []*Parameter) {
io.WriteString(w, "func ")
if recv := sig.Recv(); recv != nil {
io.WriteString(w, "(")
if n := params[0].Name(); n != "" {
io.WriteString(w, n)
io.WriteString(w, " ")
}
io.WriteString(w, params[0].Type().String())
io.WriteString(w, ") ")
params = params[1:]
}
io.WriteString(w, name)
io.WriteString(w, "(")
for i, v := range params {
if i > 0 {
io.WriteString(w, ", ")
}
io.WriteString(w, v.Name())
io.WriteString(w, " ")
if sig.IsVariadic() && i == len(params)-1 {
io.WriteString(w, "...")
io.WriteString(w, v.Type().Underlying().(*types.Slice).Elem().String())
} else {
io.WriteString(w, v.Type().String())
}
}
io.WriteString(w, ")")
if n := sig.Results().Len(); n > 0 {
io.WriteString(w, " ")
r := sig.Results()
if n == 1 && r.At(0).Name() == "" {
io.WriteString(w, r.At(0).Type().String())
} else {
io.WriteString(w, r.String())
}
}
}
func (p *exporter) signature(sig *types.Signature) {
// TODO(gri) We only need to record the receiver type
// for interface methods if we flatten them
// out. If we track embedded types instead,
// the information is already present.
// We do need the receiver information (T vs *T)
// for methods associated with named types.
if recv := sig.Recv(); recv != nil {
// 1-element tuple
p.int(1)
p.param(recv)
} else {
// 0-element tuple
p.int(0)
}
p.tuple(sig.Params())
p.tuple(sig.Results())
if sig.Variadic() {
p.int(1)
} else {
p.int(0)
}
}
func (ts *TypeStringer) writeSignature(buf *bytes.Buffer, sig *types.Signature) {
if recv := sig.Recv(); recv != nil {
ts.writeType(buf, recv.Type())
buf.WriteByte(' ')
}
ts.writeParams(buf, sig.Params(), sig.IsVariadic())
if sig.Results().Len() == 0 {
// no result
return
}
buf.WriteByte(' ')
if sig.Results().Len() == 1 {
// single unnamed result
ts.writeType(buf, sig.Results().At(0).Type())
return
}
// multiple or named result(s)
ts.writeParams(buf, sig.Results(), false)
}
func (ts *TypeStringer) writeSignature(buf *bytes.Buffer, sig *types.Signature, unique bool) {
if recv := sig.Recv(); recv != nil {
if _, ok := recv.Type().Underlying().(*types.Interface); !ok {
ts.writeType(buf, recv.Type(), unique)
buf.WriteByte(' ')
}
}
ts.writeParams(buf, sig.Params(), sig.IsVariadic(), unique)
if sig.Results().Len() == 0 {
// no result
return
}
buf.WriteByte(' ')
if sig.Results().Len() == 1 {
// single unnamed result
ts.writeType(buf, sig.Results().At(0).Type(), unique)
return
}
// multiple or named result(s)
ts.writeParams(buf, sig.Results(), false, unique)
}
func changeRecv(s *types.Signature, recv *types.Var) *types.Signature {
return types.NewSignature(nil, recv, s.Params(), s.Results(), s.Variadic())
}
func (c *PkgContext) translateFunctionBody(stmts []ast.Stmt, sig *types.Signature) {
c.funcVarNames = nil
body := c.CatchOutput(func() {
var resultNames []ast.Expr
if sig != nil && sig.Results().Len() != 0 && sig.Results().At(0).Name() != "" {
resultNames = make([]ast.Expr, sig.Results().Len())
for i := 0; i < sig.Results().Len(); i++ {
result := sig.Results().At(i)
name := result.Name()
if result.Name() == "_" {
name = "result"
}
id := ast.NewIdent(name)
c.info.Types[id] = result.Type()
c.info.Objects[id] = result
c.Printf("%s = %s;", c.translateExpr(id), c.zeroValue(result.Type()))
resultNames[i] = id
}
}
if sig != nil {
s := c.functionSig
defer func() { c.functionSig = s }()
c.functionSig = sig
}
r := c.resultNames
defer func() { c.resultNames = r }()
c.resultNames = resultNames
p := c.postLoopStmt
defer func() { c.postLoopStmt = p }()
c.postLoopStmt = make(map[string]ast.Stmt)
v := HasDeferVisitor{}
ast.Walk(&v, &ast.BlockStmt{List: stmts})
switch v.hasDefer {
case true:
c.Printf("var Go$deferred = [];")
c.Printf("try {")
c.Indent(func() {
c.translateStmtList(stmts)
})
c.Printf("} catch(Go$err) {")
c.Indent(func() {
c.Printf("if (Go$err.constructor !== Go$Panic) { Go$err = Go$wrapJavaScriptError(Go$err); }")
c.Printf("Go$errorStack.push({ frame: Go$getStackDepth(), error: Go$err });")
if sig != nil && sig.Results().Len() != 0 && resultNames == nil {
zeros := make([]string, sig.Results().Len())
for i := range zeros {
zeros[i] = c.zeroValue(sig.Results().At(i).Type())
}
c.Printf("return %s;", strings.Join(zeros, ", "))
}
})
c.Printf("} finally {")
c.Indent(func() {
c.Printf("Go$callDeferred(Go$deferred);")
if resultNames != nil {
c.translateStmt(&ast.ReturnStmt{}, "")
}
})
c.Printf("}")
case false:
c.translateStmtList(stmts)
}
})
if len(c.funcVarNames) != 0 {
c.Printf("var %s;", strings.Join(c.funcVarNames, ", "))
}
c.Write(body)
}