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[dev.regabi] cmd/compile: simplify function/interface/struct typechecking

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After the previous CL, the only callers to NewFuncType, tointerface,
or NewStructType are the functions for type-checking the type literal
ASTs. So just inline the code there.

While here, refactor the Field type-checking logic a little bit, to
reduce some duplication.

Passes toolstash -cmp.

Change-Id: Ie12d14b87ef8b6e528ac9dccd609604bd09b98ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/279956
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
This commit is contained in:
Matthew Dempsky 2020-12-23 02:48:57 -08:00
parent addade2cce
commit 31267f82e1
2 changed files with 69 additions and 90 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

87
src/cmd/compile/internal/typecheck/dcl.go
View File

@ -281,72 +281,6 @@ func CheckFuncStack() {
}
}
// turn a parsed function declaration into a type
func NewFuncType(nrecv *ir.Field, nparams, nresults []*ir.Field) *types.Type {
funarg := func(n *ir.Field) *types.Field {
lno := base.Pos
base.Pos = n.Pos
if n.Ntype != nil {
n.Type = typecheckNtype(n.Ntype).Type()
n.Ntype = nil
}
f := types.NewField(n.Pos, n.Sym, n.Type)
f.SetIsDDD(n.IsDDD)
if n.Decl != nil {
n.Decl.SetType(f.Type)
f.Nname = n.Decl
}
base.Pos = lno
return f
}
funargs := func(nn []*ir.Field) []*types.Field {
res := make([]*types.Field, len(nn))
for i, n := range nn {
res[i] = funarg(n)
}
return res
}
var recv *types.Field
if nrecv != nil {
recv = funarg(nrecv)
}
t := types.NewSignature(types.LocalPkg, recv, funargs(nparams), funargs(nresults))
checkdupfields("argument", t.Recvs().FieldSlice(), t.Params().FieldSlice(), t.Results().FieldSlice())
return t
}
// convert a parsed id/type list into
// a type for struct/interface/arglist
func NewStructType(l []*ir.Field) *types.Type {
lno := base.Pos
fields := make([]*types.Field, len(l))
for i, n := range l {
base.Pos = n.Pos
if n.Ntype != nil {
n.Type = typecheckNtype(n.Ntype).Type()
n.Ntype = nil
}
f := types.NewField(n.Pos, n.Sym, n.Type)
if n.Embedded {
checkembeddedtype(n.Type)
f.Embedded = 1
}
f.Note = n.Note
fields[i] = f
}
checkdupfields("field", fields)
base.Pos = lno
return types.NewStruct(types.LocalPkg, fields)
}
// Add a method, declared as a function.
// - msym is the method symbol
// - t is function type (with receiver)
@ -604,27 +538,6 @@ func initname(s string) bool {
return s == "init"
}
func tointerface(nmethods []*ir.Field) *types.Type {
if len(nmethods) == 0 {
return types.Types[types.TINTER]
}
lno := base.Pos
methods := make([]*types.Field, len(nmethods))
for i, n := range nmethods {
base.Pos = n.Pos
if n.Ntype != nil {
n.Type = typecheckNtype(n.Ntype).Type()
n.Ntype = nil
}
methods[i] = types.NewField(n.Pos, n.Sym, n.Type)
}
base.Pos = lno
return types.NewInterface(types.LocalPkg, methods)
}
var vargen int
func Temp(t *types.Type) *ir.Name {

72
src/cmd/compile/internal/typecheck/type.go
View File

@ -73,13 +73,42 @@ func tcChanType(n *ir.ChanType) ir.Node {
// tcFuncType typechecks an OTFUNC node.
func tcFuncType(n *ir.FuncType) ir.Node {
n.SetOTYPE(NewFuncType(n.Recv, n.Params, n.Results))
misc := func(f *types.Field, nf *ir.Field) {
f.SetIsDDD(nf.IsDDD)
if nf.Decl != nil {
nf.Decl.SetType(f.Type)
f.Nname = nf.Decl
}
}
lno := base.Pos
var recv *types.Field
if n.Recv != nil {
recv = tcField(n.Recv, misc)
}
t := types.NewSignature(types.LocalPkg, recv, tcFields(n.Params, misc), tcFields(n.Results, misc))
checkdupfields("argument", t.Recvs().FieldSlice(), t.Params().FieldSlice(), t.Results().FieldSlice())
base.Pos = lno
n.SetOTYPE(t)
return n
}
// tcInterfaceType typechecks an OTINTER node.
func tcInterfaceType(n *ir.InterfaceType) ir.Node {
n.SetOTYPE(tointerface(n.Methods))
if len(n.Methods) == 0 {
n.SetOTYPE(types.Types[types.TINTER])
return n
}
lno := base.Pos
methods := tcFields(n.Methods, nil)
base.Pos = lno
n.SetOTYPE(types.NewInterface(types.LocalPkg, methods))
return n
}
@ -117,6 +146,43 @@ func tcSliceType(n *ir.SliceType) ir.Node {
// tcStructType typechecks an OTSTRUCT node.
func tcStructType(n *ir.StructType) ir.Node {
n.SetOTYPE(NewStructType(n.Fields))
lno := base.Pos
fields := tcFields(n.Fields, func(f *types.Field, nf *ir.Field) {
if nf.Embedded {
checkembeddedtype(f.Type)
f.Embedded = 1
}
f.Note = nf.Note
})
checkdupfields("field", fields)
base.Pos = lno
n.SetOTYPE(types.NewStruct(types.LocalPkg, fields))
return n
}
// tcField typechecks a generic Field.
// misc can be provided to handle specialized typechecking.
func tcField(n *ir.Field, misc func(*types.Field, *ir.Field)) *types.Field {
base.Pos = n.Pos
if n.Ntype != nil {
n.Type = typecheckNtype(n.Ntype).Type()
n.Ntype = nil
}
f := types.NewField(n.Pos, n.Sym, n.Type)
if misc != nil {
misc(f, n)
}
return f
}
// tcFields typechecks a slice of generic Fields.
// misc can be provided to handle specialized typechecking.
func tcFields(l []*ir.Field, misc func(*types.Field, *ir.Field)) []*types.Field {
fields := make([]*types.Field, len(l))
for i, n := range l {
fields[i] = tcField(n, misc)
}
return fields
}