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[dev.typeparams] cmd/compile: start translating type params in noder2

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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>
This commit is contained in:
Dan Scales 2021-01-28 17:43:18 -08:00
parent a59cb5109d
commit 0aafd69124
5 changed files with 59 additions and 8 deletions
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16
src/cmd/compile/internal/noder/types.go
View File

@ -100,6 +100,12 @@ func (g *irgen) typ0(typ types2.Type) *types.Type {
return types.NewInterface(g.tpkg(typ), append(embeddeds, methods...))
case *types2.TypeParam:
tp := types.NewTypeParam(g.tpkg(typ), g.typ(typ.Bound()))
// Save the name of the type parameter in the sym of the type.
tp.SetSym(g.sym(typ.Obj()))
return tp
default:
base.FatalfAt(src.NoXPos, "unhandled type: %v (%T)", typ, typ)
panic("unreachable")
@ -107,6 +113,13 @@ func (g *irgen) typ0(typ types2.Type) *types.Type {
}
func (g *irgen) signature(recv *types.Field, sig *types2.Signature) *types.Type {
tparams2 := sig.TParams()
tparams := make([]*types.Field, len(tparams2))
for i := range tparams {
tp := tparams2[i]
tparams[i] = types.NewField(g.pos(tp), g.sym(tp), g.typ(tp.Type()))
}
do := func(typ *types2.Tuple) []*types.Field {
fields := make([]*types.Field, typ.Len())
for i := range fields {
@ -114,14 +127,13 @@ func (g *irgen) signature(recv *types.Field, sig *types2.Signature) *types.Type
}
return fields
}
params := do(sig.Params())
results := do(sig.Results())
if sig.Variadic() {
params[len(params)-1].SetIsDDD(true)
}
return types.NewSignature(g.tpkg(sig), recv, nil, params, results)
return types.NewSignature(g.tpkg(sig), recv, tparams, params, results)
}
func (g *irgen) param(v *types2.Var) *types.Field {

22
src/cmd/compile/internal/types/fmt.go
View File

@ -318,7 +318,7 @@ func tconv2(b *bytes.Buffer, t *Type, verb rune, mode fmtMode, visited map[*Type
}
// Unless the 'L' flag was specified, if the type has a name, just print that name.
if verb != 'L' && t.Sym() != nil && t != Types[t.Kind()] {
if verb != 'L' && t.Sym() != nil && t != Types[t.Kind()] && t.Kind() != TTYPEPARAM {
switch mode {
case fmtTypeID, fmtTypeIDName:
if verb == 'S' {
@ -478,6 +478,9 @@ func tconv2(b *bytes.Buffer, t *Type, verb rune, mode fmtMode, visited map[*Type
}
b.WriteString("func")
}
if t.NumTParams() > 0 {
tconv2(b, t.TParams(), 0, mode, visited)
}
tconv2(b, t.Params(), 0, mode, visited)
switch t.NumResults() {
@ -515,7 +518,11 @@ func tconv2(b *bytes.Buffer, t *Type, verb rune, mode fmtMode, visited map[*Type
}
if funarg := t.StructType().Funarg; funarg != FunargNone {
b.WriteByte('(')
open, close := '(', ')'
if funarg == FunargTparams {
open, close = '[', ']'
}
b.WriteByte(byte(open))
fieldVerb := 'v'
switch mode {
case fmtTypeID, fmtTypeIDName, fmtGo:
@ -528,7 +535,7 @@ func tconv2(b *bytes.Buffer, t *Type, verb rune, mode fmtMode, visited map[*Type
}
fldconv(b, f, fieldVerb, mode, visited, funarg)
}
b.WriteByte(')')
b.WriteByte(byte(close))
} else {
b.WriteString("struct {")
for i, f := range t.Fields().Slice() {
@ -554,6 +561,15 @@ func tconv2(b *bytes.Buffer, t *Type, verb rune, mode fmtMode, visited map[*Type
case TUNSAFEPTR:
b.WriteString("unsafe.Pointer")
case TTYPEPARAM:
if t.Sym() != nil {
sconv2(b, t.Sym(), 'v', mode)
} else {
b.WriteString("tp")
// Print out the pointer value for now to disambiguate type params
b.WriteString(fmt.Sprintf("%p", t))
}
case Txxx:
b.WriteString("Txxx")

5
src/cmd/compile/internal/types/size.go
View File

@ -499,6 +499,11 @@ func CalcSize(t *Type) {
base.Warn("bad type %v %d\n", t1, w)
}
t.Align = 1
case TTYPEPARAM:
// TODO(danscales) - remove when we eliminate the need
// to do CalcSize in noder2 (which shouldn't be needed in the noder)
w = int64(PtrSize)
}
if PtrSize == 4 && w != int64(int32(w)) {

20
src/cmd/compile/internal/types/type.go
View File

@ -204,7 +204,8 @@ func (t *Type) SetRecur(b bool) { t.flags.set(typeRecur, b) }
func (t *Type) Kind() Kind { return t.kind }
// Sym returns the name of type t.
func (t *Type) Sym() *Sym { return t.sym }
func (t *Type) Sym() *Sym { return t.sym }
func (t *Type) SetSym(sym *Sym) { t.sym = sym }
// Underlying returns the underlying type of type t.
func (t *Type) Underlying() *Type { return t.underlying }
@ -285,7 +286,7 @@ type Func struct {
Receiver *Type // function receiver
Results *Type // function results
Params *Type // function params
Tparams *Type // type params of receiver (if method) or function
TParams *Type // type params of receiver (if method) or function
pkg *Pkg
@ -512,6 +513,8 @@ func New(et Kind) *Type {
t.Extra = new(Tuple)
case TRESULTS:
t.Extra = new(Results)
case TTYPEPARAM:
t.Extra = new(Interface)
}
return t
}
@ -769,10 +772,12 @@ func (t *Type) wantEtype(et Kind) {
}
func (t *Type) Recvs() *Type { return t.FuncType().Receiver }
func (t *Type) TParams() *Type { return t.FuncType().TParams }
func (t *Type) Params() *Type { return t.FuncType().Params }
func (t *Type) Results() *Type { return t.FuncType().Results }
func (t *Type) NumRecvs() int { return t.FuncType().Receiver.NumFields() }
func (t *Type) NumTParams() int { return t.FuncType().TParams.NumFields() }
func (t *Type) NumParams() int { return t.FuncType().Params.NumFields() }
func (t *Type) NumResults() int { return t.FuncType().Results.NumFields() }
@ -1648,6 +1653,15 @@ func NewInterface(pkg *Pkg, methods []*Field) *Type {
return t
}
// NewTypeParam returns a new type param with the given constraint (which may
// not really be needed except for the type checker).
func NewTypeParam(pkg *Pkg, constraint *Type) *Type {
t := New(TTYPEPARAM)
t.methods = constraint.methods
t.Extra.(*Interface).pkg = pkg
return t
}
// NewSignature returns a new function type for the given receiver,
// parametes, results, and type parameters, any of which may be nil.
func NewSignature(pkg *Pkg, recv *Field, tparams, params, results []*Field) *Type {
@ -1669,7 +1683,7 @@ func NewSignature(pkg *Pkg, recv *Field, tparams, params, results []*Field) *Typ
}
ft.Receiver = funargs(recvs, FunargRcvr)
ft.Tparams = funargs(tparams, FunargTparams)
ft.TParams = funargs(tparams, FunargTparams)
ft.Params = funargs(params, FunargParams)
ft.Results = funargs(results, FunargResults)
ft.pkg = pkg

4
src/cmd/compile/internal/types2/type.go
View File

@ -837,6 +837,10 @@ type TypeParam struct {
aType
}
func (t *TypeParam) Obj() *TypeName {
return t.obj
}
// NewTypeParam returns a new TypeParam.
func (check *Checker) NewTypeParam(obj *TypeName, index int, bound Type) *TypeParam {
assert(bound != nil)