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sync.go
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// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package pkgbits
import (
"fmt"
"runtime"
"strings"
)
// 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)
// walkFrames calls visit for each call frame represented by pcs.
//
// pcs should be a slice of PCs, as returned by runtime.Callers.
func walkFrames(pcs []uintptr, visit frameVisitor) {
if len(pcs) == 0 {
return
}
frames := runtime.CallersFrames(pcs)
for {
frame, more := frames.Next()
visit(frame.File, frame.Line, frame.Function, frame.PC-frame.Entry)
if !more {
return
}
}
}
// 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
const (
_ SyncMarker = iota
// Public markers (known to go/types importers).
// Low-level coding markers.
SyncEOF
SyncBool
SyncInt64
SyncUint64
SyncString
SyncValue
SyncVal
SyncRelocs
SyncReloc
SyncUseReloc
// Higher-level object and type markers.
SyncPublic
SyncPos
SyncPosBase
SyncObject
SyncObject1
SyncPkg
SyncPkgDef
SyncMethod
SyncType
SyncTypeIdx
SyncTypeParamNames
SyncSignature
SyncParams
SyncParam
SyncCodeObj
SyncSym
SyncLocalIdent
SyncSelector
// Private markers (only known to cmd/compile).
SyncPrivate
SyncFuncExt
SyncVarExt
SyncTypeExt
SyncPragma
SyncExprList
SyncExprs
SyncExpr
SyncExprType
SyncAssign
SyncOp
SyncFuncLit
SyncCompLit
SyncDecl
SyncFuncBody
SyncOpenScope
SyncCloseScope
SyncCloseAnotherScope
SyncDeclNames
SyncDeclName
SyncStmts
SyncBlockStmt
SyncIfStmt
SyncForStmt
SyncSwitchStmt
SyncRangeStmt
SyncCaseClause
SyncCommClause
SyncSelectStmt
SyncDecls
SyncLabeledStmt
SyncUseObjLocal
SyncAddLocal
SyncLinkname
SyncStmt1
SyncStmtsEnd
SyncLabel
SyncOptLabel
SyncMultiExpr
SyncRType
SyncConvRTTI
)