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[dev.typeparams] cmd/compile: make sure types added to the dictionary are instantiated correctly

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Make sure the instantiating types are the type parameters of the containing
function (or types derived from those).

The one exception is the argument of a OFUNCINST, whose type
parameters are those of the declaration site of the function or method
being instantiated. We skip those types.

Change-Id: I4b3ff22eb8a81a76476930cf8ed2a7dd6489d8b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/336352
Trust: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
This commit is contained in:
Keith Randall 2021-07-21 19:17:20 -07:00
parent 73162a54c2
commit 5cb84f0604
1 changed files with 25 additions and 6 deletions
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31
src/cmd/compile/internal/noder/stencil.go
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@ -22,6 +22,9 @@ import (
"strconv"
)
// Enable extra consistency checks.
const doubleCheck = true
func assert(p bool) {
base.Assert(p)
}
@ -1820,7 +1823,6 @@ func (g *irgen) getGfInfo(gn *ir.Name) *gfInfo {
ir.Visit(n1, visitFunc)
}
}
addType(&info, n, n.Type())
}
@ -1847,9 +1849,17 @@ func addType(info *gfInfo, n ir.Node, t *types.Type) {
if t.IsTypeParam() && t.Underlying() == t {
return
}
if !parameterizedBy(t, info.tparams) {
if t.Kind() == types.TFUNC && n != nil &&
(t.Recv() != nil ||
n.Op() == ir.ONAME && n.Name().Class == ir.PFUNC) {
// Don't use the type of a named generic function or method,
// since that is parameterized by other typeparams.
// (They all come from arguments of a FUNCINST node.)
return
}
if doubleCheck && !parameterizedBy(t, info.tparams) {
base.Fatalf("adding type with invalid parameters %+v", t)
}
if t.Kind() == types.TSTRUCT && t.IsFuncArgStruct() {
// Multiple return values are not a relevant new type (?).
return
@ -1872,13 +1882,25 @@ func parameterizedBy1(t *types.Type, params []*types.Type, visited map[*types.Ty
return true
}
visited[t] = true
if t.Sym() != nil && len(t.RParams()) > 0 {
// This defined type is instantiated. Check the instantiating types.
for _, r := range t.RParams() {
if !parameterizedBy1(r, params, visited) {
return false
}
}
return true
}
switch t.Kind() {
case types.TTYPEPARAM:
// Check if t is one of the allowed parameters in scope.
for _, p := range params {
if p == t {
return true
}
}
// Couldn't find t in the list of allowed parameters.
return false
case types.TARRAY, types.TPTR, types.TSLICE, types.TCHAN:
@ -1888,10 +1910,7 @@ func parameterizedBy1(t *types.Type, params []*types.Type, visited map[*types.Ty
return parameterizedBy1(t.Key(), params, visited) && parameterizedBy1(t.Elem(), params, visited)
case types.TFUNC:
if t.NumTParams() > 0 {
return false
}
return parameterizedBy1(t.Recvs(), params, visited) && parameterizedBy1(t.Params(), params, visited) && parameterizedBy1(t.Results(), params, visited)
return parameterizedBy1(t.TParams(), params, visited) && parameterizedBy1(t.Recvs(), params, visited) && parameterizedBy1(t.Params(), params, visited) && parameterizedBy1(t.Results(), params, visited)
case types.TSTRUCT:
for _, f := range t.Fields().Slice() {