golang.org/x/tools@v0.21.0/go/analysis/passes/defers/defers.go (about) 1 // Copyright 2023 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 defers 6 7 import ( 8 _ "embed" 9 "go/ast" 10 11 "golang.org/x/tools/go/analysis" 12 "golang.org/x/tools/go/analysis/passes/inspect" 13 "golang.org/x/tools/go/analysis/passes/internal/analysisutil" 14 "golang.org/x/tools/go/ast/inspector" 15 "golang.org/x/tools/go/types/typeutil" 16 ) 17 18 //go:embed doc.go 19 var doc string 20 21 // Analyzer is the defers analyzer. 22 var Analyzer = &analysis.Analyzer{ 23 Name: "defers", 24 Requires: []*analysis.Analyzer{inspect.Analyzer}, 25 URL: "https://pkg.go.dev/golang.org/x/tools/go/analysis/passes/defers", 26 Doc: analysisutil.MustExtractDoc(doc, "defers"), 27 Run: run, 28 } 29 30 func run(pass *analysis.Pass) (interface{}, error) { 31 if !analysisutil.Imports(pass.Pkg, "time") { 32 return nil, nil 33 } 34 35 checkDeferCall := func(node ast.Node) bool { 36 switch v := node.(type) { 37 case *ast.CallExpr: 38 if analysisutil.IsFunctionNamed(typeutil.StaticCallee(pass.TypesInfo, v), "time", "Since") { 39 pass.Reportf(v.Pos(), "call to time.Since is not deferred") 40 } 41 case *ast.FuncLit: 42 return false // prune 43 } 44 return true 45 } 46 47 inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector) 48 49 nodeFilter := []ast.Node{ 50 (*ast.DeferStmt)(nil), 51 } 52 53 inspect.Preorder(nodeFilter, func(n ast.Node) { 54 d := n.(*ast.DeferStmt) 55 ast.Inspect(d.Call, checkDeferCall) 56 }) 57 58 return nil, nil 59 }