Add staticcheck tool

vendor/honnef.co/go/tools/staticcheck/sa3000/sa3000.go

@@ -0,0 +1,118 @@
+package sa3000
+
+import (
+	"go/ast"
+	"go/types"
+	"go/version"
+
+	"honnef.co/go/tools/analysis/code"
+	"honnef.co/go/tools/analysis/lint"
+	"honnef.co/go/tools/analysis/report"
+
+	"golang.org/x/tools/go/analysis"
+	"golang.org/x/tools/go/analysis/passes/inspect"
+	"golang.org/x/tools/go/ast/inspector"
+)
+
+var SCAnalyzer = lint.InitializeAnalyzer(&lint.Analyzer{
+	Analyzer: &analysis.Analyzer{
+		Name:     "SA3000",
+		Run:      run,
+		Requires: []*analysis.Analyzer{inspect.Analyzer},
+	},
+	Doc: &lint.RawDocumentation{
+		Title: `\'TestMain\' doesn't call \'os.Exit\', hiding test failures`,
+		Text: `Test executables (and in turn \"go test\") exit with a non-zero status
+code if any tests failed. When specifying your own \'TestMain\' function,
+it is your responsibility to arrange for this, by calling \'os.Exit\' with
+the correct code. The correct code is returned by \'(*testing.M).Run\', so
+the usual way of implementing \'TestMain\' is to end it with
+\'os.Exit(m.Run())\'.`,
+		Since:    "2017.1",
+		Severity: lint.SeverityWarning,
+		MergeIf:  lint.MergeIfAny,
+	},
+})
+
+var Analyzer = SCAnalyzer.Analyzer
+
+func run(pass *analysis.Pass) (any, error) {
+	var (
+		fnmain    ast.Node
+		callsExit bool
+		callsRun  bool
+		arg       types.Object
+	)
+	fn := func(node ast.Node, push bool) bool {
+		if !push {
+			if fnmain != nil && node == fnmain {
+				if !callsExit && callsRun {
+					report.Report(pass, fnmain, "TestMain should call os.Exit to set exit code")
+				}
+				fnmain = nil
+				callsExit = false
+				callsRun = false
+				arg = nil
+			}
+			return true
+		}
+
+		switch node := node.(type) {
+		case *ast.FuncDecl:
+			if fnmain != nil {
+				return true
+			}
+			if !isTestMain(pass, node) {
+				return false
+			}
+			if version.Compare(code.StdlibVersion(pass, node), "go1.15") >= 0 {
+				// Beginning with Go 1.15, the test framework will call
+				// os.Exit for us.
+				return false
+			}
+			fnmain = node
+			arg = pass.TypesInfo.ObjectOf(node.Type.Params.List[0].Names[0])
+			return true
+		case *ast.CallExpr:
+			if code.IsCallTo(pass, node, "os.Exit") {
+				callsExit = true
+				return false
+			}
+			sel, ok := node.Fun.(*ast.SelectorExpr)
+			if !ok {
+				return true
+			}
+			ident, ok := sel.X.(*ast.Ident)
+			if !ok {
+				return true
+			}
+			if arg != pass.TypesInfo.ObjectOf(ident) {
+				return true
+			}
+			if sel.Sel.Name == "Run" {
+				callsRun = true
+				return false
+			}
+			return true
+		default:
+			lint.ExhaustiveTypeSwitch(node)
+			return true
+		}
+	}
+	pass.ResultOf[inspect.Analyzer].(*inspector.Inspector).Nodes([]ast.Node{(*ast.FuncDecl)(nil), (*ast.CallExpr)(nil)}, fn)
+	return nil, nil
+}
+
+func isTestMain(pass *analysis.Pass, decl *ast.FuncDecl) bool {
+	if decl.Name.Name != "TestMain" {
+		return false
+	}
+	if len(decl.Type.Params.List) != 1 {
+		return false
+	}
+	arg := decl.Type.Params.List[0]
+	if len(arg.Names) != 1 {
+		return false
+	}
+	return code.IsOfPointerToTypeWithName(pass, arg.Type, "testing.M")
+}