Exemple #1
0
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)
	}
}
Exemple #2
0
func (d *DIBuilder) descriptorSignature(t *types.Signature, name string) llvm.Metadata {
	// 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 d.typeDebugDescriptor(t, name)
	}
	if dt, ok := d.types.At(t).(llvm.Metadata); ok {
		return dt
	}

	var returnType llvm.Metadata
	results := t.Results()
	switch n := results.Len(); n {
	case 0:
		returnType = d.DIType(nil) // void
	case 1:
		returnType = d.DIType(results.At(0).Type())
	default:
		fields := make([]*types.Var, results.Len())
		for i := range fields {
			f := results.At(i)
			// Structs may not have multiple fields
			// with the same name, excepting "_".
			if f.Name() == "" {
				f = types.NewVar(f.Pos(), f.Pkg(), "_", f.Type())
			}
			fields[i] = f
		}
		returnType = d.typeDebugDescriptor(types.NewStruct(fields, nil), "")
	}

	var paramTypes []llvm.Metadata
	params := t.Params()
	if params != nil && params.Len() > 0 {
		paramTypes = make([]llvm.Metadata, params.Len()+1)
		paramTypes[0] = returnType
		for i := range paramTypes[1:] {
			paramTypes[i+1] = d.DIType(params.At(i).Type())
		}
	} else {
		paramTypes = []llvm.Metadata{returnType}
	}

	// TODO(axw) get position of type definition for File field
	return d.builder.CreateSubroutineType(llvm.DISubroutineType{
		Parameters: paramTypes,
	})
}
Exemple #3
0
func changeRecv(s *types.Signature, recv *types.Var) *types.Signature {
	return types.NewSignature(nil, recv, s.Params(), s.Results(), s.Variadic())
}