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[dev.typeparams] cmd/compile/internal/types2: remove unused gcCompatibilityMode flag (cleanup)

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This flag is not needed by types2 (and possibly can also be removed
from go/types). Removed some unnecessary comments along the way.

Updates #46174.

Change-Id: I1a7a99f724205a084d1c9850bce6f6f5d33f83ca
Reviewed-on: https://go-review.googlesource.com/c/go/+/339831
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
This commit is contained in:
Robert Griesemer 2021-08-04 12:12:27 -07:00
parent bb5608dd5d
commit f14908d01b
1 changed files with 13 additions and 85 deletions
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98
src/cmd/compile/internal/types2/typestring.go
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@ -39,27 +39,6 @@ func RelativeTo(pkg *Package) Qualifier {
}
}
// If gcCompatibilityMode is set, printing of types is modified
// to match the representation of some types in the gc compiler:
//
// - byte and rune lose their alias name and simply stand for
// uint8 and int32 respectively
// - embedded interfaces get flattened (the embedding info is lost,
// and certain recursive interface types cannot be printed anymore)
//
// This makes it easier to compare packages computed with the type-
// checker vs packages imported from gc export data.
//
// Caution: This flag affects all uses of WriteType, globally.
// It is only provided for testing in conjunction with
// gc-generated data.
//
// This flag is exported in the x/tools/go/types package. We don't
// need it at the moment in the std repo and so we don't export it
// anymore. We should eventually try to remove it altogether.
// TODO(gri) remove this
var gcCompatibilityMode bool
// TypeString returns the string representation of typ.
// The Qualifier controls the printing of
// package-level objects, and may be nil.
@ -106,16 +85,6 @@ func writeType(buf *bytes.Buffer, typ Type, qf Qualifier, visited []Type) {
break
}
}
if gcCompatibilityMode {
// forget the alias names
switch t.kind {
case Byte:
t = Typ[Uint8]
case Rune:
t = Typ[Int32]
}
}
buf.WriteString(t.name)
case *Array:
@ -174,66 +143,25 @@ func writeType(buf *bytes.Buffer, typ Type, qf Qualifier, visited []Type) {
}
case *Interface:
// We write the source-level methods and embedded types rather
// than the actual method set since resolved method signatures
// may have non-printable cycles if parameters have embedded
// interface types that (directly or indirectly) embed the
// current interface. For instance, consider the result type
// of m:
//
// type T interface{
// m() interface{ T }
// }
//
buf.WriteString("interface{")
empty := true
if gcCompatibilityMode {
// print flattened interface
// (useful to compare against gc-generated interfaces)
tset := t.typeSet()
for i, m := range tset.methods {
if i > 0 {
buf.WriteString("; ")
}
buf.WriteString(m.name)
writeSignature(buf, m.typ.(*Signature), qf, visited)
empty = false
}
if !empty && tset.hasTerms() {
for i, m := range t.methods {
if i > 0 {
buf.WriteString("; ")
}
first := true
tset.is(func(t *term) bool {
if !first {
buf.WriteByte('|')
}
first = false
if t.tilde {
buf.WriteByte('~')
}
writeType(buf, t.typ, qf, visited)
return true
})
} else {
// print explicit interface methods and embedded types
for i, m := range t.methods {
if i > 0 {
buf.WriteString("; ")
}
buf.WriteString(m.name)
writeSignature(buf, m.typ.(*Signature), qf, visited)
empty = false
}
if !empty && len(t.embeddeds) > 0 {
buf.WriteString(m.name)
writeSignature(buf, m.typ.(*Signature), qf, visited)
empty = false
}
if !empty && len(t.embeddeds) > 0 {
buf.WriteString("; ")
}
for i, typ := range t.embeddeds {
if i > 0 {
buf.WriteString("; ")
}
for i, typ := range t.embeddeds {
if i > 0 {
buf.WriteString("; ")
}
writeType(buf, typ, qf, visited)
empty = false
}
writeType(buf, typ, qf, visited)
empty = false
}
// print /* incomplete */ if needed to satisfy existing tests
// TODO(gri) get rid of this eventually