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(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 (f *Finder) call(sig *types.Signature, args []ast.Expr) {
if len(args) == 0 {
return
}
// Ellipsis call? e.g. f(x, y, z...)
if _, ok := args[len(args)-1].(*ast.Ellipsis); ok {
for i, arg := range args {
// The final arg is a slice, and so is the final param.
f.assign(sig.Params().At(i).Type(), f.expr(arg))
}
return
}
var argtypes []types.Type
// Gather the effective actual parameter types.
if tuple, ok := f.info.Types[args[0]].Type.(*types.Tuple); ok {
// f(g()) call where g has multiple results?
f.expr(args[0])
// unpack the tuple
for i := 0; i < tuple.Len(); i++ {
argtypes = append(argtypes, tuple.At(i).Type())
}
} else {
for _, arg := range args {
argtypes = append(argtypes, f.expr(arg))
}
}
// Assign the actuals to the formals.
if !sig.Variadic() {
for i, argtype := range argtypes {
f.assign(sig.Params().At(i).Type(), argtype)
}
} else {
// The first n-1 parameters are assigned normally.
nnormals := sig.Params().Len() - 1
for i, argtype := range argtypes[:nnormals] {
f.assign(sig.Params().At(i).Type(), argtype)
}
// Remaining args are assigned to elements of varargs slice.
tElem := sig.Params().At(nnormals).Type().(*types.Slice).Elem()
for i := nnormals; i < len(argtypes); i++ {
f.assign(tElem, argtypes[i])
}
}
}
func (c *funcContext) translateArgs(sig *types.Signature, args []ast.Expr, ellipsis bool) []string {
params := make([]string, sig.Params().Len())
for i := range params {
if sig.Variadic() && i == len(params)-1 && !ellipsis {
varargType := sig.Params().At(i).Type().(*types.Slice)
varargs := make([]string, len(args)-i)
for j, arg := range args[i:] {
varargs[j] = c.translateImplicitConversionWithCloning(arg, varargType.Elem()).String()
}
params[i] = fmt.Sprintf("new %s([%s])", c.typeName(varargType), strings.Join(varargs, ", "))
break
}
argType := sig.Params().At(i).Type()
params[i] = c.translateImplicitConversionWithCloning(args[i], argType).String()
}
return params
}
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 (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 changeRecv(s *types.Signature, recv *types.Var) *types.Signature {
return types.NewSignature(nil, recv, s.Params(), s.Results(), s.Variadic())
}