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go/ssa: fix bug causing (manual) go/pointer stdlib test to crash.

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The needMethods cache logic was wrong: it would treat any
previous call as a cache hit, even if 'skip' was true for that
call.  As a result it could fail to generate methods for some
'skip' types, i.e. anonymous structs.

LGTM=gri
R=gri
CC=golang-codereviews
https://golang.org/cl/144750043
This commit is contained in:
Alan Donovan 2014-09-11 18:08:33 -04:00
parent 66176e290c
commit 85a9565822
2 changed files with 7 additions and 3 deletions
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2
go/pointer/stdlib_test.go
View File

@ -54,7 +54,7 @@ func TestStdlib(t *testing.T) {
prog.BuildAll()
numPkgs := len(prog.AllPackages())
if want := 140; numPkgs < want {
if want := 240; numPkgs < want {
t.Errorf("Loaded only %d packages, want at least %d", numPkgs, want)
}

8
go/ssa/builder.go
View File

@ -2307,9 +2307,13 @@ func (p *Package) needMethodsOf(T types.Type) {
// Recursive case: skip => don't call makeMethods(T).
func (p *Package) needMethods(T types.Type, skip bool) {
// Each package maintains its own set of types it has visited.
if p.needRTTI.Set(T, true) != nil {
return // already seen
if prevSkip, ok := p.needRTTI.At(T).(bool); ok {
// needMethods(T) was previously called
if !prevSkip || skip {
return // already seen, with same or false 'skip' value
}
}
p.needRTTI.Set(T, skip)
// Prune the recursion if we find a named or *named type
// belonging to another package.