sync.go (2475B)
1 // Copyright 2021 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package pkgbits 6 7 import ( 8 "fmt" 9 "runtime" 10 "strings" 11 ) 12 13 // fmtFrames formats a backtrace for reporting reader/writer desyncs. 14 func fmtFrames(pcs ...uintptr) []string { 15 res := make([]string, 0, len(pcs)) 16 walkFrames(pcs, func(file string, line int, name string, offset uintptr) { 17 // Trim package from function name. It's just redundant noise. 18 name = strings.TrimPrefix(name, "cmd/compile/internal/noder.") 19 20 res = append(res, fmt.Sprintf("%s:%v: %s +0x%v", file, line, name, offset)) 21 }) 22 return res 23 } 24 25 type frameVisitor func(file string, line int, name string, offset uintptr) 26 27 // walkFrames calls visit for each call frame represented by pcs. 28 // 29 // pcs should be a slice of PCs, as returned by runtime.Callers. 30 func walkFrames(pcs []uintptr, visit frameVisitor) { 31 if len(pcs) == 0 { 32 return 33 } 34 35 frames := runtime.CallersFrames(pcs) 36 for { 37 frame, more := frames.Next() 38 visit(frame.File, frame.Line, frame.Function, frame.PC-frame.Entry) 39 if !more { 40 return 41 } 42 } 43 } 44 45 // SyncMarker is an enum type that represents markers that may be 46 // written to export data to ensure the reader and writer stay 47 // synchronized. 48 type SyncMarker int 49 50 //go:generate stringer -type=SyncMarker -trimprefix=Sync 51 52 const ( 53 _ SyncMarker = iota 54 55 // Public markers (known to go/types importers). 56 57 // Low-level coding markers. 58 SyncEOF 59 SyncBool 60 SyncInt64 61 SyncUint64 62 SyncString 63 SyncValue 64 SyncVal 65 SyncRelocs 66 SyncReloc 67 SyncUseReloc 68 69 // Higher-level object and type markers. 70 SyncPublic 71 SyncPos 72 SyncPosBase 73 SyncObject 74 SyncObject1 75 SyncPkg 76 SyncPkgDef 77 SyncMethod 78 SyncType 79 SyncTypeIdx 80 SyncTypeParamNames 81 SyncSignature 82 SyncParams 83 SyncParam 84 SyncCodeObj 85 SyncSym 86 SyncLocalIdent 87 SyncSelector 88 89 // Private markers (only known to cmd/compile). 90 SyncPrivate 91 92 SyncFuncExt 93 SyncVarExt 94 SyncTypeExt 95 SyncPragma 96 97 SyncExprList 98 SyncExprs 99 SyncExpr 100 SyncExprType 101 SyncAssign 102 SyncOp 103 SyncFuncLit 104 SyncCompLit 105 106 SyncDecl 107 SyncFuncBody 108 SyncOpenScope 109 SyncCloseScope 110 SyncCloseAnotherScope 111 SyncDeclNames 112 SyncDeclName 113 114 SyncStmts 115 SyncBlockStmt 116 SyncIfStmt 117 SyncForStmt 118 SyncSwitchStmt 119 SyncRangeStmt 120 SyncCaseClause 121 SyncCommClause 122 SyncSelectStmt 123 SyncDecls 124 SyncLabeledStmt 125 SyncUseObjLocal 126 SyncAddLocal 127 SyncLinkname 128 SyncStmt1 129 SyncStmtsEnd 130 SyncLabel 131 SyncOptLabel 132 133 SyncMultiExpr 134 SyncRType 135 SyncConvRTTI 136 )