cmd/go: vet: pass non-.go files to vet tool

The "gofiles" cache entry has been renamed "srcfiles", and it includes
non-Go files (.s, .c, .cxx) that belong to the package. It does not
include raw cgo files.

Added regression test.

Fixes #27665

Change-Id: I4884fe9b4f823f50705f8c2d357a04a8e567734f
Reviewed-on: https://go-review.googlesource.com/c/148904
Reviewed-by: Bryan C. Mills <bcmills@google.com>

src/cmd/go/internal/work/exec.go

@@ -377,7 +377,7 @@ func (b *Builder) build(a *Action) (err error) {
 			if b.NeedExport {
 				p.Export = a.built
 			}
-			if need&needCompiledGoFiles != 0 && b.loadCachedGoFiles(a) {
+			if need&needCompiledGoFiles != 0 && b.loadCachedSrcFiles(a) {
 				need &^= needCompiledGoFiles
 			}
 			// Otherwise, we need to write files to a.Objdir (needVet, needCgoHdr).
@@ -575,7 +575,13 @@ func (b *Builder) build(a *Action) (err error) {
 			b.cacheCgoHdr(a)
 		}
 	}
-	b.cacheGofiles(a, gofiles)
+
+	var srcfiles []string // .go and non-.go
+	srcfiles = append(srcfiles, gofiles...)
+	srcfiles = append(srcfiles, sfiles...)
+	srcfiles = append(srcfiles, cfiles...)
+	srcfiles = append(srcfiles, cxxfiles...)
+	b.cacheSrcFiles(a, srcfiles)
 
 	// Running cgo generated the cgo header.
 	need &^= needCgoHdr
@@ -587,11 +593,11 @@ func (b *Builder) build(a *Action) (err error) {
 
 	// Prepare Go vet config if needed.
 	if need&needVet != 0 {
-		buildVetConfig(a, gofiles)
+		buildVetConfig(a, srcfiles)
 		need &^= needVet
 	}
 	if need&needCompiledGoFiles != 0 {
-		if !b.loadCachedGoFiles(a) {
+		if !b.loadCachedSrcFiles(a) {
 			return fmt.Errorf("failed to cache compiled Go files")
 		}
 		need &^= needCompiledGoFiles
@@ -794,13 +800,13 @@ func (b *Builder) loadCachedCgoHdr(a *Action) bool {
 	return err == nil
 }
 
-func (b *Builder) cacheGofiles(a *Action, gofiles []string) {
+func (b *Builder) cacheSrcFiles(a *Action, srcfiles []string) {
 	c := cache.Default()
 	if c == nil {
 		return
 	}
 	var buf bytes.Buffer
-	for _, file := range gofiles {
+	for _, file := range srcfiles {
 		if !strings.HasPrefix(file, a.Objdir) {
 			// not generated
 			buf.WriteString("./")
@@ -815,7 +821,7 @@ func (b *Builder) cacheGofiles(a *Action, gofiles []string) {
 			return
 		}
 	}
-	c.PutBytes(cache.Subkey(a.actionID, "gofiles"), buf.Bytes())
+	c.PutBytes(cache.Subkey(a.actionID, "srcfiles"), buf.Bytes())
 }
 
 func (b *Builder) loadCachedVet(a *Action) bool {
@@ -823,34 +829,34 @@ func (b *Builder) loadCachedVet(a *Action) bool {
 	if c == nil {
 		return false
 	}
-	list, _, err := c.GetBytes(cache.Subkey(a.actionID, "gofiles"))
+	list, _, err := c.GetBytes(cache.Subkey(a.actionID, "srcfiles"))
 	if err != nil {
 		return false
 	}
-	var gofiles []string
+	var srcfiles []string
 	for _, name := range strings.Split(string(list), "\n") {
 		if name == "" { // end of list
 			continue
 		}
 		if strings.HasPrefix(name, "./") {
-			gofiles = append(gofiles, name[2:])
+			srcfiles = append(srcfiles, name[2:])
 			continue
 		}
 		if err := b.loadCachedObjdirFile(a, c, name); err != nil {
 			return false
 		}
-		gofiles = append(gofiles, a.Objdir+name)
+		srcfiles = append(srcfiles, a.Objdir+name)
 	}
-	buildVetConfig(a, gofiles)
+	buildVetConfig(a, srcfiles)
 	return true
 }
 
-func (b *Builder) loadCachedGoFiles(a *Action) bool {
+func (b *Builder) loadCachedSrcFiles(a *Action) bool {
 	c := cache.Default()
 	if c == nil {
 		return false
 	}
-	list, _, err := c.GetBytes(cache.Subkey(a.actionID, "gofiles"))
+	list, _, err := c.GetBytes(cache.Subkey(a.actionID, "srcfiles"))
 	if err != nil {
 		return false
 	}
@@ -879,6 +885,7 @@ type vetConfig struct {
 	Dir        string   // directory containing package
 	ImportPath string   // canonical import path ("package path")
 	GoFiles    []string // absolute paths to package source files
+	NonGoFiles []string // absolute paths to package non-Go files
 
 	ImportMap   map[string]string // map import path in source code to package path
 	PackageFile map[string]string // map package path to .a file with export data
@@ -890,7 +897,18 @@ type vetConfig struct {
 	SucceedOnTypecheckFailure bool // awful hack; see #18395 and below
 }
 
-func buildVetConfig(a *Action, gofiles []string) {
+func buildVetConfig(a *Action, srcfiles []string) {
+	// Classify files based on .go extension.
+	// srcfiles does not include raw cgo files.
+	var gofiles, nongofiles []string
+	for _, name := range srcfiles {
+		if strings.HasSuffix(name, ".go") {
+			gofiles = append(gofiles, name)
+		} else {
+			nongofiles = append(nongofiles, name)
+		}
+	}
+
 	// Pass list of absolute paths to vet,
 	// so that vet's error messages will use absolute paths,
 	// so that we can reformat them relative to the directory
@@ -899,6 +917,7 @@ func buildVetConfig(a *Action, gofiles []string) {
 		Compiler:    cfg.BuildToolchainName,
 		Dir:         a.Package.Dir,
 		GoFiles:     mkAbsFiles(a.Package.Dir, gofiles),
+		NonGoFiles:  mkAbsFiles(a.Package.Dir, nongofiles),
 		ImportPath:  a.Package.ImportPath,
 		ImportMap:   make(map[string]string),
 		PackageFile: make(map[string]string),
@@ -995,6 +1014,8 @@ func (b *Builder) vet(a *Action) error {
 		}
 	}
 
+	// TODO(adonovan): delete this when we use the new vet printf checker.
+	// https://github.com/golang/go/issues/28756
 	if vcfg.ImportMap["fmt"] == "" {
 		a1 := a.Deps[1]
 		vcfg.ImportMap["fmt"] = "fmt"

src/cmd/go/testdata/script/vet_asm.txt

@@ -0,0 +1,15 @@
+# Issue 27665. Verify that "go vet" analyzes non-Go files.
+
+env GOARCH=amd64
+! go vet -asmdecl a
+stderr 'f: invalid MOVW of x'
+
+-- a/a.go --
+package a
+
+func f(x int8)
+
+-- a/asm.s --
+TEXT ·f(SB),0,$0-1
+	MOVW	x+0(FP), AX
+	RET

src/cmd/vet/main.go

@@ -365,6 +365,7 @@ type vetConfig struct {
 	Dir         string
 	ImportPath  string
 	GoFiles     []string
+	NonGoFiles  []string
 	ImportMap   map[string]string
 	PackageFile map[string]string
 	Standard    map[string]bool
@@ -430,7 +431,12 @@ func doPackageCfg(cfgFile string) {
 	stdImporter = &vcfg
 	inittypes()
 	mustTypecheck = true
-	doPackage(vcfg.GoFiles, nil)
+
+	var allFiles []string
+	allFiles = append(allFiles, vcfg.GoFiles...)
+	allFiles = append(allFiles, vcfg.NonGoFiles...)
+
+	doPackage(allFiles, nil)
 	if vcfg.VetxOutput != "" {
 		out := make([]vetxExport, 0, len(exporters))
 		for name, fn := range exporters {