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cmd/api: internal debugging supprt

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Document that the package cache has
an issue (8425) to speed up future
debugging.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/143980043
This commit is contained in:
Robert Griesemer 2014-09-15 16:40:43 -07:00
parent 7e62316b84
commit 2bb0a5e085
1 changed files with 20 additions and 9 deletions
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11
src/cmd/api/goapi.go
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@ -450,6 +450,11 @@ func contains(list []string, s string) bool {
return false
}
// The package cache doesn't operate correctly in rare (so far artificial)
// circumstances (issue 8425). Disable before debugging non-obvious errors
// from the type-checker.
const usePkgCache = true
var (
pkgCache = map[string]*types.Package{} // map tagKey to package
pkgTags = map[string][]string{} // map import dir to list of relevant tags
@ -511,6 +516,7 @@ func (w *Walker) Import(name string) (pkg *types.Package) {
// If we've already done an import with the same set
// of relevant tags, reuse the result.
var key string
if usePkgCache {
if tags, ok := pkgTags[dir]; ok {
key = tagKey(dir, context, tags)
if pkg := pkgCache[key]; pkg != nil {
@ -518,6 +524,7 @@ func (w *Walker) Import(name string) (pkg *types.Package) {
return pkg
}
}
}
info, err := context.ImportDir(dir, 0)
if err != nil {
@ -528,10 +535,12 @@ func (w *Walker) Import(name string) (pkg *types.Package) {
}
// Save tags list first time we see a directory.
if usePkgCache {
if _, ok := pkgTags[dir]; !ok {
pkgTags[dir] = info.AllTags
key = tagKey(dir, context, info.AllTags)
}
}
filenames := append(append([]string{}, info.GoFiles...), info.CgoFiles...)
@ -583,7 +592,9 @@ func (w *Walker) Import(name string) (pkg *types.Package) {
log.Fatalf("error typechecking package %s: %s (%s)", name, err, ctxt)
}
if usePkgCache {
pkgCache[key] = pkg
}
w.imported[name] = pkg
return