Fix many linters ignoring Cgo files

This change fixes a bug caused that many linters ignored all files that are
using Cgo. It was introduced by PR #1065, which assumed that all files
referenced by //line directives are non-Go files, which is not true. In the case
of Cgo they point to the original Go files which are used by Cgo as templates to
generate other Go files.

The fix replaces all calls of Pass.Fset.PositionFor with a function
getFileNames() that first calls Pass.Fset.PositionFor with adjustment, and only
if it results in a non-Go file it calls Pass.Fset.PositionFor again without
adjustment.

Fixes: #2910

Signed-off-by: Sven Anderson <sven@anderson.de>

pkg/golinters/dupl.go

@@ -55,11 +55,7 @@ func NewDupl(settings *config.DuplSettings) *goanalysis.Linter {
 }
 
 func runDupl(pass *analysis.Pass, settings *config.DuplSettings) ([]goanalysis.Issue, error) {
-	var fileNames []string
-	for _, f := range pass.Files {
-		pos := pass.Fset.PositionFor(f.Pos(), false)
-		fileNames = append(fileNames, pos.Filename)
-	}
+	fileNames := getFileNames(pass)
 
 	issues, err := duplAPI.Run(fileNames, settings.Threshold)
 	if err != nil {

pkg/golinters/gci.go

@@ -83,11 +83,7 @@ func NewGci(settings *config.GciSettings) *goanalysis.Linter {
 }
 
 func runGci(pass *analysis.Pass, lintCtx *linter.Context, cfg *gcicfg.Config, lock *sync.Mutex) ([]goanalysis.Issue, error) {
-	var fileNames []string
-	for _, f := range pass.Files {
-		pos := pass.Fset.PositionFor(f.Pos(), false)
-		fileNames = append(fileNames, pos.Filename)
-	}
+	fileNames := getFileNames(pass)
 
 	var diffs []string
 	err := diffFormattedFilesToArray(fileNames, *cfg, &diffs, lock)

pkg/golinters/gofmt.go

@@ -53,11 +53,7 @@ func NewGofmt(settings *config.GoFmtSettings) *goanalysis.Linter {
 }
 
 func runGofmt(lintCtx *linter.Context, pass *analysis.Pass, settings *config.GoFmtSettings) ([]goanalysis.Issue, error) {
-	var fileNames []string
-	for _, f := range pass.Files {
-		pos := pass.Fset.PositionFor(f.Pos(), false)
-		fileNames = append(fileNames, pos.Filename)
-	}
+	fileNames := getFileNames(pass)
 
 	var issues []goanalysis.Issue
 

pkg/golinters/gofumpt.go

@@ -73,11 +73,7 @@ func NewGofumpt(settings *config.GofumptSettings) *goanalysis.Linter {
 }
 
 func runGofumpt(lintCtx *linter.Context, pass *analysis.Pass, diff differ, options format.Options) ([]goanalysis.Issue, error) {
-	var fileNames []string
-	for _, f := range pass.Files {
-		pos := pass.Fset.PositionFor(f.Pos(), false)
-		fileNames = append(fileNames, pos.Filename)
-	}
+	fileNames := getFileNames(pass)
 
 	var issues []goanalysis.Issue
 

pkg/golinters/goimports.go

@@ -55,11 +55,7 @@ func NewGoimports(settings *config.GoImportsSettings) *goanalysis.Linter {
 }
 
 func runGoiImports(lintCtx *linter.Context, pass *analysis.Pass) ([]goanalysis.Issue, error) {
-	var fileNames []string
-	for _, f := range pass.Files {
-		pos := pass.Fset.PositionFor(f.Pos(), false)
-		fileNames = append(fileNames, pos.Filename)
-	}
+	fileNames := getFileNames(pass)
 
 	var issues []goanalysis.Issue
 

pkg/golinters/gomodguard.go

@@ -73,12 +73,7 @@ func NewGomodguard(settings *config.GoModGuardSettings) *goanalysis.Linter {
 		}
 
 		analyzer.Run = func(pass *analysis.Pass) (interface{}, error) {
-			var files []string
-			for _, file := range pass.Files {
-				files = append(files, pass.Fset.PositionFor(file.Pos(), false).Filename)
-			}
-
-			gomodguardIssues := processor.ProcessFiles(files)
+			gomodguardIssues := processor.ProcessFiles(getFileNames(pass))
 
 			mu.Lock()
 			defer mu.Unlock()

pkg/golinters/lll.go

@@ -56,11 +56,7 @@ func NewLLL(settings *config.LllSettings) *goanalysis.Linter {
 }
 
 func runLll(pass *analysis.Pass, settings *config.LllSettings) ([]goanalysis.Issue, error) {
-	var fileNames []string
-	for _, f := range pass.Files {
-		pos := pass.Fset.PositionFor(f.Pos(), false)
-		fileNames = append(fileNames, pos.Filename)
-	}
+	fileNames := getFileNames(pass)
 
 	spaces := strings.Repeat(" ", settings.TabWidth)
 

pkg/golinters/misspell.go

@@ -61,12 +61,7 @@ func NewMisspell(settings *config.MisspellSettings) *goanalysis.Linter {
 }
 
 func runMisspell(lintCtx *linter.Context, pass *analysis.Pass, replacer *misspell.Replacer) ([]goanalysis.Issue, error) {
-	var fileNames []string
-
-	for _, f := range pass.Files {
-		pos := pass.Fset.PositionFor(f.Pos(), false)
-		fileNames = append(fileNames, pos.Filename)
-	}
+	fileNames := getFileNames(pass)
 
 	var issues []goanalysis.Issue
 	for _, filename := range fileNames {

pkg/golinters/revive.go

@@ -75,11 +75,7 @@ func NewRevive(settings *config.ReviveSettings) *goanalysis.Linter {
 }
 
 func runRevive(lintCtx *linter.Context, pass *analysis.Pass, settings *config.ReviveSettings) ([]goanalysis.Issue, error) {
-	var files []string
-	for _, file := range pass.Files {
-		files = append(files, pass.Fset.PositionFor(file.Pos(), false).Filename)
-	}
-	packages := [][]string{files}
+	packages := [][]string{getFileNames(pass)}
 
 	conf, err := getReviveConfig(settings)
 	if err != nil {

pkg/golinters/util.go

@@ -2,8 +2,11 @@ package golinters
 
 import (
 	"fmt"
+	"path/filepath"
 	"strings"
 
+	"golang.org/x/tools/go/analysis"
+
 	"github.com/golangci/golangci-lint/pkg/config"
 )
 
@@ -22,3 +25,17 @@ func formatCodeBlock(code string, _ *config.Config) string {
 
 	return fmt.Sprintf("```\n%s\n```", code)
 }
+
+func getFileNames(pass *analysis.Pass) []string {
+	var fileNames []string
+	for _, f := range pass.Files {
+		fileName := pass.Fset.PositionFor(f.Pos(), true).Filename
+		ext := filepath.Ext(fileName)
+		if ext != "" && ext != ".go" {
+			// position has been adjusted to a non-go file, revert to original file
+			fileName = pass.Fset.PositionFor(f.Pos(), false).Filename
+		}
+		fileNames = append(fileNames, fileName)
+	}
+	return fileNames
+}

pkg/golinters/wsl.go

@@ -67,15 +67,11 @@ func NewWSL(settings *config.WSLSettings) *goanalysis.Linter {
 }
 
 func runWSL(pass *analysis.Pass, conf *wsl.Configuration) []goanalysis.Issue {
-	var files = make([]string, 0, len(pass.Files))
-	for _, file := range pass.Files {
-		files = append(files, pass.Fset.PositionFor(file.Pos(), false).Filename)
-	}
-
 	if conf == nil {
 		return nil
 	}
 
+	files := getFileNames(pass)
 	wslErrors, _ := wsl.NewProcessorWithConfig(*conf).ProcessFiles(files)
 	if len(wslErrors) == 0 {
 		return nil

test/run_test.go

@@ -106,6 +106,8 @@ func TestCgoWithIssues(t *testing.T) {
 		ExpectHasIssue("SA5009: Printf format %t has arg #1 of wrong type")
 	r.Run("--no-config", "--disable-all", "-Egofmt", getTestDataDir("cgo_with_issues")).
 		ExpectHasIssue("File is not `gofmt`-ed with `-s` (gofmt)")
+	r.Run("--no-config", "--disable-all", "-Erevive", getTestDataDir("cgo_with_issues")).
+		ExpectHasIssue("indent-error-flow: if block ends with a return statement")
 }
 
 func TestUnsafeOk(t *testing.T) {
@@ -129,7 +131,7 @@ func TestLineDirectiveProcessedFilesLiteLoading(t *testing.T) {
 }
 
 func TestSortedResults(t *testing.T) {
-	var testCases = []struct {
+	testCases := []struct {
 		opt  string
 		want string
 	}{