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[dev.typeparams] cmd/compile: use old export format if not compiling with generics

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Write out export data with the old export format (iexportVersionPosCol)
if not compiling with generics (-G=0, the default value). This helps
ensure we don't break tests involving x/tools/go/gcexportdata (since we
can't modify that tool yet to use the new format).

Change-Id: I5f9bce44ed1e0696fc65fead6bab9e30de88461d
Reviewed-on: https://go-review.googlesource.com/c/go/+/323189
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Trust: Robert Griesemer <gri@golang.org>
This commit is contained in:
Dan Scales 2021-05-27 11:18:13 -07:00
parent 8c99e5db43
commit c2c1b53b39
1 changed files with 16 additions and 4 deletions
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20
src/cmd/compile/internal/typecheck/iexport.go
View file

@ -306,7 +306,12 @@ func WriteExports(out *bufio.Writer) {
// Assemble header.
var hdr intWriter
hdr.WriteByte('i')
hdr.uint64(iexportVersionCurrent)
if base.Flag.G > 0 {
hdr.uint64(iexportVersionCurrent)
} else {
// Use old export format if doing -G=0 (no generics)
hdr.uint64(iexportVersionPosCol)
}
hdr.uint64(uint64(p.strings.Len()))
hdr.uint64(dataLen)
@ -478,7 +483,9 @@ func (p *iexporter) doDecl(n *ir.Name) {
// referenced via their type offset (via typOff) in all
// other places in the signature and function that they
// are used.
w.tparamList(n.Type().TParams().FieldSlice())
if base.Flag.G > 0 {
w.tparamList(n.Type().TParams().FieldSlice())
}
w.signature(n.Type())
w.funcExt(n)
@ -511,8 +518,10 @@ func (p *iexporter) doDecl(n *ir.Name) {
w.tag('T')
w.pos(n.Pos())
// Export any new typeparams needed for this type
w.typeList(n.Type().RParams())
if base.Flag.G > 0 {
// Export any new typeparams needed for this type
w.typeList(n.Type().RParams())
}
underlying := n.Type().Underlying()
if underlying == types.ErrorType.Underlying() {
// For "type T error", use error as the
@ -826,6 +835,7 @@ func (w *exportWriter) startType(k itag) {
func (w *exportWriter) doTyp(t *types.Type) {
if t.Kind() == types.TTYPEPARAM {
assert(base.Flag.G > 0)
// A typeparam has a name, but doesn't have an underlying type.
// Just write out the details of the type param here. All other
// uses of this typeparam type will be written out as its unique
@ -846,6 +856,7 @@ func (w *exportWriter) doTyp(t *types.Type) {
s := t.Sym()
if s != nil && t.OrigSym != nil {
assert(base.Flag.G > 0)
// This is an instantiated type - could be a re-instantiation like
// Value[T2] or a full instantiation like Value[int].
if strings.Index(s.Name, "[") < 0 {
@ -945,6 +956,7 @@ func (w *exportWriter) doTyp(t *types.Type) {
}
case types.TUNION:
assert(base.Flag.G > 0)
// TODO(danscales): possibly put out the tilde bools in more
// compact form.
w.startType(unionType)