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[dev.typeparams] cmd/compile: start translating type params in noder2
Also, make some fmt changes so that the type parameters and the typeparam type are displayed in -W=2. You can now parse a simple generic function (but not generic calls or generic types) and print out the noder IR via 'go tool compile -G=2 -W=2 func.go' Change-Id: I1f070fc4a96174a447763ad37999e61c25905901 Reviewed-on: https://go-review.googlesource.com/c/go/+/287833 Run-TryBot: Dan Scales <danscales@google.com> TryBot-Result: Go Bot <gobot@golang.org> Trust: Dan Scales <danscales@google.com> Trust: Robert Griesemer <gri@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>
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@ -100,6 +100,12 @@ func (g *irgen) typ0(typ types2.Type) *types.Type {
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return types.NewInterface(g.tpkg(typ), append(embeddeds, methods...))
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case *types2.TypeParam:
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tp := types.NewTypeParam(g.tpkg(typ), g.typ(typ.Bound()))
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// Save the name of the type parameter in the sym of the type.
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tp.SetSym(g.sym(typ.Obj()))
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return tp
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default:
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base.FatalfAt(src.NoXPos, "unhandled type: %v (%T)", typ, typ)
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panic("unreachable")
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@ -107,6 +113,13 @@ func (g *irgen) typ0(typ types2.Type) *types.Type {
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}
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func (g *irgen) signature(recv *types.Field, sig *types2.Signature) *types.Type {
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tparams2 := sig.TParams()
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tparams := make([]*types.Field, len(tparams2))
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for i := range tparams {
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tp := tparams2[i]
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tparams[i] = types.NewField(g.pos(tp), g.sym(tp), g.typ(tp.Type()))
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}
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do := func(typ *types2.Tuple) []*types.Field {
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fields := make([]*types.Field, typ.Len())
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for i := range fields {
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@ -114,14 +127,13 @@ func (g *irgen) signature(recv *types.Field, sig *types2.Signature) *types.Type
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}
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return fields
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}
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params := do(sig.Params())
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results := do(sig.Results())
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if sig.Variadic() {
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params[len(params)-1].SetIsDDD(true)
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}
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return types.NewSignature(g.tpkg(sig), recv, nil, params, results)
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return types.NewSignature(g.tpkg(sig), recv, tparams, params, results)
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}
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func (g *irgen) param(v *types2.Var) *types.Field {
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@ -318,7 +318,7 @@ func tconv2(b *bytes.Buffer, t *Type, verb rune, mode fmtMode, visited map[*Type
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}
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// Unless the 'L' flag was specified, if the type has a name, just print that name.
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if verb != 'L' && t.Sym() != nil && t != Types[t.Kind()] {
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if verb != 'L' && t.Sym() != nil && t != Types[t.Kind()] && t.Kind() != TTYPEPARAM {
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switch mode {
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case fmtTypeID, fmtTypeIDName:
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if verb == 'S' {
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@ -478,6 +478,9 @@ func tconv2(b *bytes.Buffer, t *Type, verb rune, mode fmtMode, visited map[*Type
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}
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b.WriteString("func")
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}
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if t.NumTParams() > 0 {
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tconv2(b, t.TParams(), 0, mode, visited)
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}
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tconv2(b, t.Params(), 0, mode, visited)
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switch t.NumResults() {
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@ -515,7 +518,11 @@ func tconv2(b *bytes.Buffer, t *Type, verb rune, mode fmtMode, visited map[*Type
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}
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if funarg := t.StructType().Funarg; funarg != FunargNone {
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b.WriteByte('(')
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open, close := '(', ')'
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if funarg == FunargTparams {
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open, close = '[', ']'
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}
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b.WriteByte(byte(open))
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fieldVerb := 'v'
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switch mode {
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case fmtTypeID, fmtTypeIDName, fmtGo:
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@ -528,7 +535,7 @@ func tconv2(b *bytes.Buffer, t *Type, verb rune, mode fmtMode, visited map[*Type
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}
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fldconv(b, f, fieldVerb, mode, visited, funarg)
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}
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b.WriteByte(')')
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b.WriteByte(byte(close))
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} else {
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b.WriteString("struct {")
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for i, f := range t.Fields().Slice() {
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@ -554,6 +561,15 @@ func tconv2(b *bytes.Buffer, t *Type, verb rune, mode fmtMode, visited map[*Type
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case TUNSAFEPTR:
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b.WriteString("unsafe.Pointer")
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case TTYPEPARAM:
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if t.Sym() != nil {
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sconv2(b, t.Sym(), 'v', mode)
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} else {
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b.WriteString("tp")
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// Print out the pointer value for now to disambiguate type params
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b.WriteString(fmt.Sprintf("%p", t))
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}
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case Txxx:
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b.WriteString("Txxx")
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@ -499,6 +499,11 @@ func CalcSize(t *Type) {
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base.Warn("bad type %v %d\n", t1, w)
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}
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t.Align = 1
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case TTYPEPARAM:
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// TODO(danscales) - remove when we eliminate the need
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// to do CalcSize in noder2 (which shouldn't be needed in the noder)
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w = int64(PtrSize)
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}
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if PtrSize == 4 && w != int64(int32(w)) {
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@ -204,7 +204,8 @@ func (t *Type) SetRecur(b bool) { t.flags.set(typeRecur, b) }
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func (t *Type) Kind() Kind { return t.kind }
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// Sym returns the name of type t.
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func (t *Type) Sym() *Sym { return t.sym }
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func (t *Type) Sym() *Sym { return t.sym }
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func (t *Type) SetSym(sym *Sym) { t.sym = sym }
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// Underlying returns the underlying type of type t.
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func (t *Type) Underlying() *Type { return t.underlying }
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@ -285,7 +286,7 @@ type Func struct {
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Receiver *Type // function receiver
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Results *Type // function results
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Params *Type // function params
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Tparams *Type // type params of receiver (if method) or function
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TParams *Type // type params of receiver (if method) or function
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pkg *Pkg
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@ -512,6 +513,8 @@ func New(et Kind) *Type {
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t.Extra = new(Tuple)
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case TRESULTS:
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t.Extra = new(Results)
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case TTYPEPARAM:
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t.Extra = new(Interface)
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}
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return t
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}
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@ -769,10 +772,12 @@ func (t *Type) wantEtype(et Kind) {
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}
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func (t *Type) Recvs() *Type { return t.FuncType().Receiver }
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func (t *Type) TParams() *Type { return t.FuncType().TParams }
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func (t *Type) Params() *Type { return t.FuncType().Params }
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func (t *Type) Results() *Type { return t.FuncType().Results }
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func (t *Type) NumRecvs() int { return t.FuncType().Receiver.NumFields() }
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func (t *Type) NumTParams() int { return t.FuncType().TParams.NumFields() }
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func (t *Type) NumParams() int { return t.FuncType().Params.NumFields() }
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func (t *Type) NumResults() int { return t.FuncType().Results.NumFields() }
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@ -1648,6 +1653,15 @@ func NewInterface(pkg *Pkg, methods []*Field) *Type {
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return t
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}
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// NewTypeParam returns a new type param with the given constraint (which may
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// not really be needed except for the type checker).
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func NewTypeParam(pkg *Pkg, constraint *Type) *Type {
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t := New(TTYPEPARAM)
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t.methods = constraint.methods
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t.Extra.(*Interface).pkg = pkg
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return t
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}
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// NewSignature returns a new function type for the given receiver,
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// parametes, results, and type parameters, any of which may be nil.
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func NewSignature(pkg *Pkg, recv *Field, tparams, params, results []*Field) *Type {
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@ -1669,7 +1683,7 @@ func NewSignature(pkg *Pkg, recv *Field, tparams, params, results []*Field) *Typ
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}
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ft.Receiver = funargs(recvs, FunargRcvr)
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ft.Tparams = funargs(tparams, FunargTparams)
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ft.TParams = funargs(tparams, FunargTparams)
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ft.Params = funargs(params, FunargParams)
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ft.Results = funargs(results, FunargResults)
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ft.pkg = pkg
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@ -837,6 +837,10 @@ type TypeParam struct {
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aType
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}
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func (t *TypeParam) Obj() *TypeName {
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return t.obj
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}
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// NewTypeParam returns a new TypeParam.
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func (check *Checker) NewTypeParam(obj *TypeName, index int, bound Type) *TypeParam {
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assert(bound != nil)
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