diff options
Diffstat (limited to 'src/cmd/compile/internal/noder/sync.go')
| -rw-r--r-- | src/cmd/compile/internal/noder/sync.go | 33 |
1 files changed, 32 insertions, 1 deletions
diff --git a/src/cmd/compile/internal/noder/sync.go b/src/cmd/compile/internal/noder/sync.go index 7326a6edbe..aef98dbd78 100644 --- a/src/cmd/compile/internal/noder/sync.go +++ b/src/cmd/compile/internal/noder/sync.go @@ -6,8 +6,39 @@ package noder -const debug = true +import ( + "fmt" + "strings" +) + +// enableSync controls whether sync markers are written into unified +// IR's export data format and also whether they're expected when +// reading them back in. They're inessential to the correct +// functioning of unified IR, but are helpful during development to +// detect mistakes. +// +// When sync is enabled, writer stack frames will also be included in +// the export data. Currently, a fixed number of frames are included, +// controlled by -d=syncframes (default 0). +const enableSync = true + +// fmtFrames formats a backtrace for reporting reader/writer desyncs. +func fmtFrames(pcs ...uintptr) []string { + res := make([]string, 0, len(pcs)) + walkFrames(pcs, func(file string, line int, name string, offset uintptr) { + // Trim package from function name. It's just redundant noise. + name = strings.TrimPrefix(name, "cmd/compile/internal/noder.") + + res = append(res, fmt.Sprintf("%s:%v: %s +0x%v", file, line, name, offset)) + }) + return res +} + +type frameVisitor func(file string, line int, name string, offset uintptr) +// syncMarker is an enum type that represents markers that may be +// written to export data to ensure the reader and writer stay +// synchronized. type syncMarker int //go:generate stringer -type=syncMarker -trimprefix=sync |