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internal/lsp/cache: don't invalidate dependents' metadata

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Rerun of CL 210458. Only invalidate metadata for packages directly
involving the changed file.

Change-Id: Id28647851254a9bdcb3dbe7a762194bb025da913
Reviewed-on: https://go-review.googlesource.com/c/tools/+/211779
Run-TryBot: Heschi Kreinick <heschi@google.com>
Reviewed-by: Rebecca Stambler <rstambler@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Heschi Kreinick 2019-12-17 19:18:48 -05:00
parent 6f9e13bbec
commit bc4a8d3946
1 changed files with 13 additions and 11 deletions
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24
internal/lsp/cache/snapshot.go vendored
View File

@ -464,17 +464,17 @@ func (s *snapshot) clone(ctx context.Context, withoutFile source.File) *snapshot
s.mu.Lock()
defer s.mu.Unlock()
toInvalidate := map[packageID]struct{}{}
directIDs := map[packageID]struct{}{}
// Collect all of the package IDs that correspond to the given file.
// TODO: if the file has moved into a new package, we should invalidate that too.
for _, id := range s.ids[withoutFile.URI()] {
toInvalidate[id] = struct{}{}
directIDs[id] = struct{}{}
}
// If we are invalidating a go.mod file then we should invalidate all of the packages in the module
if withoutFile.Kind() == source.Mod {
for id := range s.workspacePackages {
toInvalidate[id] = struct{}{}
directIDs[id] = struct{}{}
}
}
@ -492,7 +492,7 @@ func (s *snapshot) clone(ctx context.Context, withoutFile source.File) *snapshot
if fdirStat, err := os.Stat(dir(uri.Filename())); err == nil {
if os.SameFile(dirStat, fdirStat) {
for _, id := range s.ids[uri] {
toInvalidate[id] = struct{}{}
directIDs[id] = struct{}{}
}
}
}
@ -502,21 +502,22 @@ func (s *snapshot) clone(ctx context.Context, withoutFile source.File) *snapshot
// If there is no known FileHandle and no known IDs for the given file,
// there is nothing to invalidate.
if len(toInvalidate) == 0 && originalFH == nil {
if len(directIDs) == 0 && originalFH == nil {
// TODO(heschi): clone anyway? Seems like this is just setting us up for trouble.
return s
}
// Invalidate reverse dependencies too.
// TODO(heschi): figure out the locking model and use transitiveReverseDeps?
transitiveIDs := make(map[packageID]struct{})
var addRevDeps func(packageID)
addRevDeps = func(id packageID) {
toInvalidate[id] = struct{}{}
transitiveIDs[id] = struct{}{}
for _, rid := range s.getImportedByLocked(id) {
addRevDeps(rid)
}
}
for id := range toInvalidate {
for id := range directIDs {
addRevDeps(id)
}
@ -544,14 +545,14 @@ func (s *snapshot) clone(ctx context.Context, withoutFile source.File) *snapshot
}
// Copy the package type information.
for k, v := range s.packages {
if _, ok := toInvalidate[k.id]; ok {
if _, ok := transitiveIDs[k.id]; ok {
continue
}
result.packages[k] = v
}
// Copy the package analysis information.
for k, v := range s.actions {
if _, ok := toInvalidate[k.pkg.id]; ok {
if _, ok := transitiveIDs[k.pkg.id]; ok {
continue
}
result.actions[k] = v
@ -568,9 +569,10 @@ func (s *snapshot) clone(ctx context.Context, withoutFile source.File) *snapshot
// and if so, invalidate this file's packages' metadata.
invalidateMetadata := s.view.session.cache.shouldLoad(ctx, s, originalFH, currentFH)
// Copy the package metadata.
// Copy the package metadata. We only need to invalidate packages directly
// containing the affected file, and only if it changed in a relevant way.
for k, v := range s.metadata {
if _, ok := toInvalidate[k]; invalidateMetadata && ok {
if _, ok := directIDs[k]; invalidateMetadata && ok {
continue
}
result.metadata[k] = v