diff options
Diffstat (limited to 'src/internal/pkgbits/decoder.go')
| -rw-r--r-- | src/internal/pkgbits/decoder.go | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/src/internal/pkgbits/decoder.go b/src/internal/pkgbits/decoder.go index 0b5fd9705c..5e233b8770 100644 --- a/src/internal/pkgbits/decoder.go +++ b/src/internal/pkgbits/decoder.go @@ -18,6 +18,12 @@ import ( // A PkgDecoder provides methods for decoding a package's Unified IR // export data. type PkgDecoder struct { + // version is the file format version. + version uint32 + + // sync indicates whether the file uses sync markers. + sync bool + // pkgPath is the package path for the package to be decoded. // // TODO(mdempsky): Remove; unneeded since CL 391014. @@ -52,6 +58,9 @@ type PkgDecoder struct { // TODO(mdempsky): Remove; unneeded since CL 391014. func (pr *PkgDecoder) PkgPath() string { return pr.pkgPath } +// SyncMarkers reports whether pr uses sync markers. +func (pr *PkgDecoder) SyncMarkers() bool { return pr.sync } + // NewPkgDecoder returns a PkgDecoder initialized to read the Unified // IR export data from input. pkgPath is the package path for the // compilation unit that produced the export data. @@ -67,9 +76,18 @@ func NewPkgDecoder(pkgPath, input string) PkgDecoder { r := strings.NewReader(input) - var version uint32 - assert(binary.Read(r, binary.LittleEndian, &version) == nil) - assert(version == 0) + assert(binary.Read(r, binary.LittleEndian, &pr.version) == nil) + + switch pr.version { + default: + panic(fmt.Errorf("unsupported version: %v", pr.version)) + case 0: + // no flags + case 1: + var flags uint32 + assert(binary.Read(r, binary.LittleEndian, &flags) == nil) + pr.sync = flags&flagSyncMarkers != 0 + } assert(binary.Read(r, binary.LittleEndian, pr.elemEndsEnds[:]) == nil) @@ -215,7 +233,7 @@ func (r *Decoder) rawReloc(k RelocKind, idx int) Index { // // If EnableSync is false, then Sync is a no-op. func (r *Decoder) Sync(mWant SyncMarker) { - if !EnableSync { + if !r.common.sync { return } |