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ast.go
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/*
Copyright 2021 The GoPlus Authors (goplus.org)
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package gogen
import (
"errors"
"fmt"
"go/ast"
"go/constant"
"go/token"
"go/types"
"log"
"math/big"
"reflect"
"strconv"
"strings"
"github.com/goplus/gogen/internal"
"github.com/goplus/gogen/internal/typesutil"
)
var (
errTemplateRecvMethodCallUnexpected = errors.New("matchFuncCall (TemplateRecvMethod) unexpected")
)
// ----------------------------------------------------------------------------
var (
underscore = &ast.Ident{Name: "_"}
)
var (
identTrue = ident("true")
identFalse = ident("false")
identNil = ident("nil")
identAppend = ident("append")
identLen = ident("len")
identCap = ident("cap")
identNew = ident("new")
identMake = ident("make")
identIota = ident("iota")
)
func ident(name string) *ast.Ident {
return &ast.Ident{Name: name}
}
func boolean(v bool) *ast.Ident {
if v {
return identTrue
}
return identFalse
}
func stringLit(val string) *ast.BasicLit {
return &ast.BasicLit{Kind: token.STRING, Value: strconv.Quote(val)}
}
func toRecv(pkg *Package, recv *types.Var) *ast.FieldList {
var names []*ast.Ident
if name := recv.Name(); name != "" {
names = []*ast.Ident{ident(name)}
}
fld := &ast.Field{Names: names, Type: toRecvType(pkg, recv.Type())}
return &ast.FieldList{List: []*ast.Field{fld}}
}
// -----------------------------------------------------------------------------
// function type
func toFieldList(pkg *Package, t *types.Tuple) []*ast.Field {
if t == nil {
return nil
}
n := t.Len()
flds := make([]*ast.Field, n)
for i := 0; i < n; i++ {
item := t.At(i)
var names []*ast.Ident
if name := item.Name(); name != "" {
names = []*ast.Ident{ident(name)}
}
typ := toType(pkg, item.Type())
flds[i] = &ast.Field{Names: names, Type: typ}
}
return flds
}
func toFields(pkg *Package, t *types.Struct) []*ast.Field {
n := t.NumFields()
flds := make([]*ast.Field, n)
for i := 0; i < n; i++ {
item := t.Field(i)
var names []*ast.Ident
if !item.Embedded() {
names = []*ast.Ident{{Name: item.Name()}}
}
typ := toType(pkg, item.Type())
fld := &ast.Field{Names: names, Type: typ}
if tag := t.Tag(i); tag != "" {
fld.Tag = toTag(tag)
}
flds[i] = fld
}
return flds
}
func toTag(tag string) *ast.BasicLit {
var s string
if strings.ContainsAny(tag, "`\r\n") {
s = strconv.Quote(tag)
} else {
s = "`" + tag + "`"
}
return &ast.BasicLit{Kind: token.STRING, Value: s}
}
func toVariadic(fld *ast.Field) {
t, ok := fld.Type.(*ast.ArrayType)
if !ok || t.Len != nil {
panic("TODO: not a slice type")
}
fld.Type = &ast.Ellipsis{Elt: t.Elt}
}
// -----------------------------------------------------------------------------
func toType(pkg *Package, typ types.Type) ast.Expr {
retry:
switch t := typ.(type) {
case *types.Basic: // bool, int, etc
return toBasicType(pkg, t)
case *types.Pointer:
return &ast.StarExpr{X: toType(pkg, t.Elem())}
case *types.Named:
return toNamedType(pkg, t)
case *types.Interface:
return toInterface(pkg, t)
case *types.Slice:
return toSliceType(pkg, t)
case *types.Array:
return toArrayType(pkg, t)
case *types.Map:
return toMapType(pkg, t)
case *types.Struct:
return toStructType(pkg, t)
case *types.Chan:
return toChanType(pkg, t)
case *types.Signature:
return toFuncType(pkg, t)
case *unboundType:
if t.tBound == nil {
panic("unbound type")
}
typ = t.tBound
goto retry
case *TypeParam:
return toObjectExpr(pkg, t.Obj())
case *Union:
return toUnionType(pkg, t)
case *typesutil.Alias:
return toObjectExpr(pkg, t.Obj())
}
log.Panicln("TODO: toType -", reflect.TypeOf(typ))
return nil
}
func toBasicType(pkg *Package, t *types.Basic) ast.Expr {
if t.Kind() == types.UnsafePointer {
return toObjectExpr(pkg, unsafeRef("Pointer"))
}
if (t.Info() & types.IsUntyped) != 0 {
panic("unexpected: untyped type")
}
return &ast.Ident{Name: t.Name()}
}
func isUntyped(pkg *Package, typ types.Type) bool {
switch t := typ.(type) {
case *types.Basic:
return (t.Info() & types.IsUntyped) != 0
case *types.Named:
switch t {
case pkg.utBigInt, pkg.utBigRat, pkg.utBigFlt:
return true
}
}
return false
}
func toChanType(pkg *Package, t *types.Chan) ast.Expr {
return &ast.ChanType{Value: toType(pkg, t.Elem()), Dir: chanDirs[t.Dir()]}
}
var (
chanDirs = [...]ast.ChanDir{
types.SendRecv: ast.SEND | ast.RECV,
types.SendOnly: ast.SEND,
types.RecvOnly: ast.RECV,
}
)
func toStructType(pkg *Package, t *types.Struct) ast.Expr {
list := toFields(pkg, t)
return &ast.StructType{Fields: &ast.FieldList{List: list}}
}
func toArrayType(pkg *Package, t *types.Array) ast.Expr {
var len ast.Expr
if n := t.Len(); n < 0 {
len = &ast.Ellipsis{}
} else {
len = &ast.BasicLit{Kind: token.INT, Value: strconv.FormatInt(t.Len(), 10)}
}
return &ast.ArrayType{Len: len, Elt: toType(pkg, t.Elem())}
}
func toSliceType(pkg *Package, t *types.Slice) ast.Expr {
return &ast.ArrayType{Elt: toType(pkg, t.Elem())}
}
func toMapType(pkg *Package, t *types.Map) ast.Expr {
return &ast.MapType{Key: toType(pkg, t.Key()), Value: toType(pkg, t.Elem())}
}
var (
universeAny = types.Universe.Lookup("any")
)
func toInterface(pkg *Package, t *types.Interface) ast.Expr {
if t == universeAny.Type() {
return ast.NewIdent("any")
} else if interfaceIsImplicit(t) && t.NumEmbeddeds() == 1 {
return toType(pkg, t.EmbeddedType(0))
}
var flds []*ast.Field
for i, n := 0, t.NumEmbeddeds(); i < n; i++ {
typ := toType(pkg, t.EmbeddedType(i))
fld := &ast.Field{Type: typ}
flds = append(flds, fld)
}
for i, n := 0, t.NumExplicitMethods(); i < n; i++ {
fn := t.ExplicitMethod(i)
name := ident(fn.Name())
typ := toFuncType(pkg, fn.Type().(*types.Signature))
fld := &ast.Field{Names: []*ast.Ident{name}, Type: typ}
flds = append(flds, fld)
}
return &ast.InterfaceType{Methods: &ast.FieldList{List: flds}}
}
// -----------------------------------------------------------------------------
// expression
func toExpr(pkg *Package, val interface{}, src ast.Node) *internal.Elem {
if val == nil {
return &internal.Elem{
Val: identNil,
Type: types.Typ[types.UntypedNil],
Src: src,
}
}
switch v := val.(type) {
case *ast.BasicLit:
return &internal.Elem{
Val: v,
Type: types.Typ[toBasicKind(v.Kind)],
CVal: constant.MakeFromLiteral(v.Value, v.Kind, 0),
Src: src,
}
case *types.TypeName:
switch typ := v.Type(); typ.(type) {
case *TyInstruction: // instruction as a type
return toObject(pkg, v, src)
default:
if debugInstr {
log.Printf("Val %v => Typ %v", v, typ)
}
return &internal.Elem{
Val: toType(pkg, typ), Type: NewTypeType(typ), Src: src,
}
}
case *types.Builtin:
name := v.Name()
o := pkg.builtin.TryRef(name)
if o == nil {
o = pkg.unsafe_.Ref(name)
}
return toObject(pkg, o, src)
case types.Object:
if v == iotaObj {
v := pkg.cb.iotav
return &internal.Elem{
Val: identIota,
Type: types.Typ[types.UntypedInt],
CVal: constant.MakeInt64(int64(v)),
Src: src,
}
}
return toObject(pkg, v, src)
case *Element:
return v
case int:
return &internal.Elem{
Val: &ast.BasicLit{Kind: token.INT, Value: strconv.Itoa(v)},
Type: types.Typ[types.UntypedInt],
CVal: constant.MakeInt64(int64(v)),
Src: src,
}
case string:
return &internal.Elem{
Val: &ast.BasicLit{Kind: token.STRING, Value: strconv.Quote(v)},
Type: types.Typ[types.UntypedString],
CVal: constant.MakeString(v),
Src: src,
}
case bool:
return &internal.Elem{
Val: boolean(v),
Type: types.Typ[types.UntypedBool],
CVal: constant.MakeBool(v),
Src: src,
}
case rune:
return &internal.Elem{
Val: &ast.BasicLit{Kind: token.CHAR, Value: strconv.QuoteRune(v)},
Type: types.Typ[types.UntypedRune],
CVal: constant.MakeInt64(int64(v)),
Src: src,
}
case float64:
val := strconv.FormatFloat(v, 'g', -1, 64)
if !strings.ContainsAny(val, ".e") {
val += ".0"
}
return &internal.Elem{
Val: &ast.BasicLit{Kind: token.FLOAT, Value: val},
Type: types.Typ[types.UntypedFloat],
CVal: constant.MakeFloat64(v),
Src: src,
}
}
panic("unexpected: unsupport value type")
}
var (
iotaObj = types.Universe.Lookup("iota")
)
func toBasicKind(tok token.Token) types.BasicKind {
return tok2BasicKinds[tok]
}
var (
tok2BasicKinds = [...]types.BasicKind{
token.INT: types.UntypedInt,
token.STRING: types.UntypedString,
token.CHAR: types.UntypedRune,
token.FLOAT: types.UntypedFloat,
token.IMAG: types.UntypedComplex,
}
)
func chgObject(pkg *Package, v types.Object, old *internal.Elem) *internal.Elem {
ret := toObject(pkg, v, old.Src)
if denoted := getDenoted(old.Val); denoted != nil {
setDenoted(ret.Val, denoted)
}
return ret
}
func toObject(pkg *Package, v types.Object, src ast.Node) *internal.Elem {
var cval constant.Value
if cv, ok := v.(*types.Const); ok {
cval = cv.Val()
}
return &internal.Elem{
Val: toObjectExpr(pkg, v), Type: realType(v.Type()), CVal: cval, Src: src,
}
}
func toObjectExpr(pkg *Package, v types.Object) ast.Expr {
atPkg, name := v.Pkg(), v.Name()
if atPkg == nil || atPkg == pkg.Types { // at universe or at this package
return ident(name)
}
if atPkg == pkg.builtin.Types { // at builtin package
if strings.HasPrefix(name, goxPrefix) {
opName := name[len(goxPrefix):]
if op, ok := nameToOps[opName]; ok {
switch op.Arity {
case 2:
return &ast.BinaryExpr{Op: op.Tok}
case 1:
return &ast.UnaryExpr{Op: op.Tok}
}
}
}
return ident(name)
}
x := pkg.file.newImport(atPkg.Name(), atPkg.Path())
return &ast.SelectorExpr{
X: x,
Sel: ident(v.Name()),
}
}
type operator struct {
Tok token.Token
Arity int
}
var (
nameToOps = map[string]operator{
"Add": {token.ADD, 2},
"Sub": {token.SUB, 2},
"Mul": {token.MUL, 2},
"Quo": {token.QUO, 2},
"Rem": {token.REM, 2},
"Or": {token.OR, 2},
"Xor": {token.XOR, 2},
"And": {token.AND, 2},
"AndNot": {token.AND_NOT, 2},
"LOr": {token.LOR, 2},
"LAnd": {token.LAND, 2},
"Lsh": {token.SHL, 2},
"Rsh": {token.SHR, 2},
"LT": {token.LSS, 2},
"LE": {token.LEQ, 2},
"GT": {token.GTR, 2},
"GE": {token.GEQ, 2},
"EQ": {token.EQL, 2},
"NE": {token.NEQ, 2},
"Neg": {token.SUB, 1},
"Dup": {token.ADD, 1},
"Not": {token.XOR, 1},
"LNot": {token.NOT, 1},
"Recv": {token.ARROW, 1},
"Addr": {token.AND, 1},
}
)
func toFuncCall(pkg *Package, fn *internal.Elem, args []*internal.Elem, flags InstrFlags) *internal.Elem {
ret, err := matchFuncCall(pkg, fn, args, flags)
if err != nil {
panic(err)
}
return ret
}
func unaryOp(pkg *Package, tok token.Token, args []*internal.Elem) constant.Value {
if len(args) == 1 {
if a := args[0].CVal; a != nil {
var prec uint
if isUnsigned(args[0].Type) {
prec = uint(pkg.Sizeof(args[0].Type) * 8)
}
return constant.UnaryOp(tok, a, prec)
}
}
return nil
}
func isUnsigned(typ types.Type) bool {
retry:
switch t := typ.(type) {
case *types.Basic:
return (t.Info() & types.IsUnsigned) != 0
case *types.Named:
typ = t.Underlying()
goto retry
}
return false
}
func binaryOp(cb *CodeBuilder, tok token.Token, args []*internal.Elem) constant.Value {
if len(args) == 2 {
if a, b := args[0].CVal, args[1].CVal; a != nil && b != nil {
if tok == token.QUO && isNormalInt(cb, args[0]) && isNormalInt(cb, args[1]) {
tok = token.QUO_ASSIGN // issue #805
}
return doBinaryOp(a, tok, b)
}
}
return nil
}
func isBool(cb *CodeBuilder, arg *internal.Elem) bool { // is bool
return isBasicKind(cb, arg, types.IsBoolean)
}
func isNormalInt(cb *CodeBuilder, arg *internal.Elem) bool { // is integer but not bigint
return isBasicKind(cb, arg, types.IsInteger)
}
func isBasicKind(cb *CodeBuilder, arg *internal.Elem, kind types.BasicInfo) bool {
argType := arg.Type
retry:
switch t := argType.(type) {
case *types.Basic:
return (t.Info() & kind) != 0
case *types.Named:
argType = cb.getUnderlying(t)
goto retry
}
return false
}
func doBinaryOp(a constant.Value, tok token.Token, b constant.Value) constant.Value {
switch binaryOpKinds[tok] {
case binaryOpNormal:
return constant.BinaryOp(a, tok, b)
case binaryOpCompare:
return constant.MakeBool(constant.Compare(a, tok, b))
default:
a, b = constant.ToInt(a), constant.ToInt(b)
if s, exact := constant.Int64Val(b); exact {
return constant.Shift(a, tok, uint(s))
}
panic("constant value is overflow")
}
}
const (
binaryOpNormal = iota
binaryOpCompare
binaryOpShift
)
var (
binaryOpKinds = [...]int{
token.ADD: 0, // +
token.SUB: 0, // -
token.MUL: 0, // *
token.QUO: 0, // /
token.REM: 0, // %
token.AND: 0, // &
token.OR: 0, // |
token.XOR: 0, // ^
token.AND_NOT: 0, // &^
token.SHL: binaryOpShift, // <<
token.SHR: binaryOpShift, // >>
token.LAND: 0, // &&
token.LOR: 0, // ||
token.LSS: binaryOpCompare,
token.LEQ: binaryOpCompare,
token.GTR: binaryOpCompare,
token.GEQ: binaryOpCompare,
token.EQL: binaryOpCompare,
token.NEQ: binaryOpCompare,
}
)
func getParamLen(sig *types.Signature) int {
n := sig.Params().Len()
if sig.Recv() != nil {
n++
}
return n
}
func getParam(sig *types.Signature, i int) *types.Var {
if sig.Recv() != nil {
i--
}
if i < 0 {
return sig.Recv()
}
return sig.Params().At(i)
}
func getParam1st(sig *types.Signature) int {
if sig.Recv() != nil {
return 1
}
return 0
}
// TODO: check if fn.recv != nil
func matchFuncCall(pkg *Package, fn *internal.Elem, args []*internal.Elem, flags InstrFlags) (ret *internal.Elem, err error) {
fnType := fn.Type
if debugMatch {
ft := fnType
if t, ok := fnType.(*types.Signature); ok {
if ftex, ok := CheckSigFuncEx(t); ok {
ft = ftex
}
}
log.Println("==> MatchFuncCall", ft, "args:", len(args), "flags:", flags)
}
var it *instantiated
var sig *types.Signature
var cval constant.Value
retry:
switch t := fnType.(type) {
case *types.Signature:
if t.TypeParams() != nil {
if (flags & instrFlagGopxFunc) == 0 {
rt, err := InferFunc(pkg, fn, t, nil, args, flags)
if err != nil {
return nil, pkg.cb.newCodeError(getSrcPos(fn.Src), err.Error())
}
sig = rt.(*types.Signature)
if debugMatch {
log.Println("==> InferFunc", sig)
}
} else {
fn, sig, args, err = boundTypeParams(pkg, fn, t, args, flags)
if err != nil {
return
}
flags &= ^instrFlagGopxFunc
}
break
}
if fex, ok := CheckFuncEx(t); ok {
switch ft := fex.(type) {
case *TyOverloadFunc:
backup := backupArgs(args)
for _, o := range ft.Funcs {
if ret, err = matchFuncCall(pkg, chgObject(pkg, o, fn), args, flags); err == nil {
if ret.CVal == nil && isUntyped(pkg, ret.Type) {
ret.CVal = builtinCall(fn, args)
}
if pkg.cb.rec != nil {
pkg.cb.rec.Call(fn.Src, o)
}
return
}
restoreArgs(args, backup)
}
return
case *TyOverloadMethod:
backup := backupArgs(args)
for _, o := range ft.Methods {
mfn := *fn
if (flags & instrFlagBinaryOp) != 0 { // from cb.BinaryOp
mfn.Type = methodToFuncSig(pkg, o, &mfn)
} else {
mfn.Val.(*ast.SelectorExpr).Sel = ident(o.Name())
mfn.Type = methodCallSig(o.Type())
}
if ret, err = matchFuncCall(pkg, &mfn, args, flags); err == nil {
fn.Val, fn.Type = mfn.Val, mfn.Type
if pkg.cb.rec != nil {
pkg.cb.rec.Call(fn.Src, o)
}
return
}
restoreArgs(args, backup)
}
return
case *TyTemplateRecvMethod:
err = errTemplateRecvMethodCallUnexpected
if denoted := getDenoted(fn.Val); denoted != nil {
if recv, ok := denoted.Data.(*Element); ok {
backup := backupArgs(args)
for i := 0; i < 2; i++ {
tfn := toObject(pkg, ft.Func, fn.Src)
targs := make([]*internal.Elem, len(args)+1)
targ0 := *recv
if i == 1 {
targ0.Val = &ast.UnaryExpr{Op: token.AND, X: targ0.Val}
targ0.Type = types.NewPointer(targ0.Type)
}
targs[0] = &targ0
for j, arg := range args {
targs[j+1] = arg
}
if ret, err = matchFuncCall(pkg, tfn, targs, flags|instrFlagGoptFunc); err == nil {
if pkg.cb.rec != nil {
if _, ok := CheckFuncEx(ft.Func.Type().(*types.Signature)); !ok {
pkg.cb.rec.Call(fn.Src, ft.Func)
}
}
return
}
if isPointer(targ0.Type) {
break
}
restoreArgs(args, backup)
}
}
}
return
case *tyTypeAsParams:
return matchFuncCall(pkg, chgObject(pkg, ft.obj, fn), args, flags|instrFlagGopxFunc)
}
} else {
sig = t
}
case *TemplateSignature: // template function
sig, it = t.instantiate()
if t.isUnaryOp() {
cval = unaryOp(pkg, t.tok(), args)
} else if t.isOp() {
cval = binaryOp(&pkg.cb, t.tok(), args)
} else if t.hasApproxType() {
flags |= instrFlagApproxType
}
case *TyInstruction:
return t.instr.Call(pkg, args, flags, fn.Src)
case *TypeType: // type convert
if on, ok := CheckOverloadNamed(t.typ); ok {
return matchOverloadNamedTypeCast(pkg, on.Obj, fn.Src, args, flags)
}
return matchTypeCast(pkg, t.typ, fn, args, flags)
case *types.Named:
fnType = pkg.cb.getUnderlying(t)
goto retry
case *inferFuncType:
sig = t.InstanceWithArgs(args, flags)
if debugMatch {
log.Println("==> InferFunc", sig)
}
default:
src, pos := pkg.cb.loadExpr(fn.Src)
pkg.cb.panicCodeErrorf(pos, "cannot call non-function %s (type %v)", src, fn.Type)
}
if err = matchFuncType(pkg, args, flags, sig, fn); err != nil {
return
}
tyRet := toRetType(sig.Results(), it)
if cval != nil { // untyped bigint/bigrat
if ret, ok := untypeBig(pkg, cval, tyRet); ok {
return ret, nil
}
}
switch t := fn.Val.(type) {
case *ast.BinaryExpr:
t.X, t.Y = checkParenExpr(args[0].Val), checkParenExpr(args[1].Val)
return &internal.Elem{Val: t, Type: tyRet, CVal: cval}, nil
case *ast.UnaryExpr:
t.X = args[0].Val
return &internal.Elem{Val: t, Type: tyRet, CVal: cval}, nil
}
var valArgs []ast.Expr
var recv = getParam1st(sig)
if n := len(args); n > recv { // for method, args[0] is already in fn.Val
valArgs = make([]ast.Expr, n-recv)
for i := recv; i < n; i++ {
valArgs[i-recv] = args[i].Val
}
}
return &internal.Elem{
Type: tyRet, CVal: cval,
Val: &ast.CallExpr{
Fun: fn.Val, Args: valArgs, Ellipsis: token.Pos(flags & InstrFlagEllipsis)},
}, nil
}
func matchOverloadNamedTypeCast(pkg *Package, t *types.TypeName, src ast.Node, args []*internal.Elem, flags InstrFlags) (ret *internal.Elem, err error) {
cast := gopxPrefix + t.Name() + "_Cast"
o := t.Pkg().Scope().Lookup(cast)
if o == nil {
err := pkg.cb.newCodeErrorf(getSrcPos(src), "typecast %v not found", t.Type())
return nil, err
}
fn := toObject(pkg, o, src)
return matchFuncCall(pkg, fn, args, flags|instrFlagGopxFunc)
}
func matchTypeCast(pkg *Package, typ types.Type, fn *internal.Elem, args []*internal.Elem, flags InstrFlags) (ret *internal.Elem, err error) {
fnVal := fn.Val
switch typ.(type) {
case *types.Pointer, *types.Chan:
fnVal = &ast.ParenExpr{X: fnVal}
}
if len(args) == 1 && ConvertibleTo(pkg, args[0].Type, typ) {
if args[0].CVal != nil {
if t, ok := typ.(*types.Named); ok {
o := t.Obj()
if at := o.Pkg(); at != nil {
tname := o.Name()
if checkUntypedOverflows(at.Scope(), tname, args[0]) {
src, pos := pkg.cb.loadExpr(args[0].Src)
err = pkg.cb.newCodeError(pos, fmt.Sprintf("cannot convert %v (untyped int constant %v) to type %v", src, args[0].CVal, tname))
return
}
}
}
}
goto finish
}
switch t := typ.(type) {
case *types.Basic:
if len(args) == 1 {
if ret, ok := CastFromBool(&pkg.cb, typ, args[0]); ok {
return ret, nil
}
}
case *types.Named:
o := t.Obj()
if at := o.Pkg(); at != nil {
tname := o.Name()
scope := at.Scope()
name := tname + "_Cast"
if cast := scope.Lookup(name); cast != nil {
if len(args) == 1 && args[0].CVal != nil {
if checkUntypedOverflows(scope, tname, args[0]) {
src, pos := pkg.cb.loadExpr(args[0].Src)
err = pkg.cb.newCodeError(pos, fmt.Sprintf("cannot convert %v (untyped int constant %v) to type %v", src, args[0].CVal, tname))
return
}
}
castFn := &internal.Elem{Val: toObjectExpr(pkg, cast), Type: cast.Type()}
if ret, err = matchFuncCall(pkg, castFn, args, flags); err == nil {
if ret.CVal == nil && len(args) == 1 && checkUntypedType(scope, tname) {
ret.CVal = args[0].CVal
}
return
}
}
}
}
switch len(args) {
case 1:
arg := args[0]
switch t := arg.Type.(type) {
case *types.Named:
if m := lookupMethod(t, "Gop_Rcast"); m != nil {
switch mt := m.Type().(type) {
case *types.Signature:
if funcs, ok := CheckOverloadMethod(mt); ok {
for _, o := range funcs {
if ret, err = matchRcast(pkg, arg, o, typ, flags); err == nil {
return
}
}
} else if ret, err = matchRcast(pkg, arg, m, typ, flags); err == nil {
return
}
}
}
}
case 0:
// T() means to return zero value of T
return pkg.cb.ZeroLit(typ).stk.Pop(), nil
}
finish:
valArgs := make([]ast.Expr, len(args))
for i, v := range args { // TODO: type check
valArgs[i] = v.Val
}
ret = &internal.Elem{
Val: &ast.CallExpr{Fun: fnVal, Args: valArgs, Ellipsis: token.Pos(flags & InstrFlagEllipsis)},
Type: typ,
}
if len(args) == 1 { // TODO: const value may changed by type-convert
ret.CVal = args[0].CVal
}
return
}
func matchRcast(pkg *Package, fn *internal.Elem, m types.Object, typ types.Type, flags InstrFlags) (ret *internal.Elem, err error) {
sig := m.Type().(*types.Signature)
if sig.Params().Len() != 0 {
log.Panicf("TODO: method %v should haven't no arguments\n", m)
}
n := 1
if (flags & InstrFlagTwoValue) != 0 {
n = 2
}
results := sig.Results()
if results.Len() != n {
return nil, fmt.Errorf("TODO: %v should return %d results", m, n)
}
if types.Identical(results.At(0).Type(), typ) {
return pkg.cb.Val(fn).MemberVal(m.Name()).CallWith(0, flags).stk.Pop(), nil
}
return nil, &MatchError{
Src: fn.Src, Arg: fn.Type, Param: typ, At: "Gop_Rcast",
Fset: pkg.cb.fset, intr: pkg.cb.interp,
}
}
// CastFromBool tries to cast a bool expression into integer. typ must be an integer type.
func CastFromBool(cb *CodeBuilder, typ types.Type, v *Element) (ret *Element, ok bool) {
if ok = isBool(cb, v); ok {
if v.CVal != nil { // untyped bool
var val int
if constant.BoolVal(v.CVal) {
val = 1
}
return toExpr(nil, val, v.Src), true
}
pkg := cb.pkg
results := types.NewTuple(types.NewParam(token.NoPos, pkg.Types, "", typ))
ret = cb.NewClosure(nil, results, false).BodyStart(pkg).
If().Val(v).Then().Val(1).Return(1).
Else().Val(0).Return(1).
End().
End().Call(0).
stk.Pop()
}
return
}
func isPointer(typ types.Type) bool {
_, ok := typ.(*types.Pointer)
return ok
}
func checkParenExpr(x ast.Expr) ast.Expr {
switch v := x.(type) {
case *ast.CompositeLit:
return &ast.ParenExpr{X: x}
case *ast.SelectorExpr:
v.X = checkParenExpr(v.X)
}
return x
}
type backupElem struct {
typ types.Type
val ast.Expr
}
func backupArgs(args []*internal.Elem) []backupElem {
backup := make([]backupElem, len(args))
for i, arg := range args {
backup[i].typ, backup[i].val = arg.Type, arg.Val
}
return backup
}
func restoreArgs(args []*internal.Elem, backup []backupElem) {
for i, arg := range args {
arg.Type, arg.Val = backup[i].typ, backup[i].val
}
}
/*
func copyArgs(args []*internal.Elem) []*internal.Elem {
backup := make([]*internal.Elem, len(args))
copy(backup, args)
return backup
}
*/
func untypeBig(pkg *Package, cval constant.Value, tyRet types.Type) (*internal.Elem, bool) {
switch tyRet {
case pkg.utBigInt:
var val *big.Int
switch v := constant.Val(cval).(type) {
case int64:
val = big.NewInt(v)
case *big.Int:
val = v
case *big.Rat:
return pkg.cb.UntypedBigRat(v).stk.Pop(), true
default:
panic("unexpected constant")
}
return pkg.cb.UntypedBigInt(val).stk.Pop(), true
case pkg.utBigRat:
var val *big.Rat
switch v := constant.Val(cval).(type) {
case int64:
val = big.NewRat(v, 1)
case *big.Rat:
val = v
case *big.Int:
val = new(big.Rat).SetInt(v)
default:
panic("unexpected constant")
}
return pkg.cb.UntypedBigRat(val).stk.Pop(), true
case types.Typ[types.UntypedBool], types.Typ[types.Bool]:
return &internal.Elem{
Val: boolean(constant.BoolVal(cval)), Type: tyRet, CVal: cval,
}, true
}
return nil, false
}
func toRetType(t *types.Tuple, it *instantiated) types.Type {
if t == nil {
return nil