cmd/vet: adjust vet to use go/types and friends from std repo

- s|"golang.org/x/tools/go/exact"|"go/constant"|
- s|"golang.org/x/tools/go/types"|"go/types"|
- removed import of gcimporter
- import "go/importer" instead
- trivial adjustments to make use of go/importer
- adjusted import paths for whitelist.go

Change-Id: I43488ff44c329cd869c92dcc31193fb31bebfd29
Reviewed-on: https://go-review.googlesource.com/10695Reviewed-by: Rob Pike <r@golang.org>

src/cmd/vet/composite.go

@@ -7,11 +7,10 @@
 package main
 
 import (
+	"cmd/vet/whitelist"
 	"flag"
 	"go/ast"
 	"strings"
-
-	"golang.org/x/tools/cmd/vet/whitelist"
 )
 
 var compositeWhiteList = flag.Bool("compositewhitelist", true, "use composite white list; for testing only")

src/cmd/vet/copylock.go

@@ -11,8 +11,7 @@ import (
 	"fmt"
 	"go/ast"
 	"go/token"
-
-	"golang.org/x/tools/go/types"
+	"go/types"
 )
 
 func init() {

src/cmd/vet/main.go

@@ -15,14 +15,12 @@ import (
 	"go/parser"
 	"go/printer"
 	"go/token"
+	"go/types"
 	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strconv"
 	"strings"
-
-	_ "golang.org/x/tools/go/gcimporter"
-	"golang.org/x/tools/go/types"
 )
 
 var (

src/cmd/vet/nilfunc.go

@@ -12,8 +12,7 @@ package main
 import (
 	"go/ast"
 	"go/token"
-
-	"golang.org/x/tools/go/types"
+	"go/types"
 )
 
 func init() {

src/cmd/vet/print.go

@@ -10,13 +10,12 @@ import (
 	"bytes"
 	"flag"
 	"go/ast"
+	"go/constant"
 	"go/token"
+	"go/types"
 	"strconv"
 	"strings"
 	"unicode/utf8"
-
-	"golang.org/x/tools/go/exact"
-	"golang.org/x/tools/go/types"
 )
 
 var printfuncs = flag.String("printfuncs", "", "comma-separated list of print function names to check")
@@ -160,11 +159,11 @@ func (f *File) checkPrintf(call *ast.CallExpr, name string, formatIndex int) {
 		}
 		return
 	}
-	if lit.Kind() != exact.String {
+	if lit.Kind() != constant.String {
 		f.Badf(call.Pos(), "constant %v not a string in call to %s", lit, name)
 		return
 	}
-	format := exact.StringVal(lit)
+	format := constant.StringVal(lit)
 	firstArg := formatIndex + 1 // Arguments are immediately after format string.
 	if !strings.Contains(format, "%") {
 		if len(call.Args) > firstArg {

src/cmd/vet/shadow.go

@@ -34,8 +34,7 @@ import (
 	"flag"
 	"go/ast"
 	"go/token"
-
-	"golang.org/x/tools/go/types"
+	"go/types"
 )
 
 var strictShadowing = flag.Bool("shadowstrict", false, "whether to be strict about shadowing; can be noisy")

src/cmd/vet/shift.go

@@ -10,10 +10,9 @@ package main
 
 import (
 	"go/ast"
+	"go/constant"
 	"go/token"
-
-	"golang.org/x/tools/go/exact"
-	"golang.org/x/tools/go/types"
+	"go/types"
 )
 
 func init() {
@@ -46,7 +45,7 @@ func checkLongShift(f *File, node ast.Node, x, y ast.Expr) {
 	if v == nil {
 		return
 	}
-	amt, ok := exact.Int64Val(v)
+	amt, ok := constant.Int64Val(v)
 	if !ok {
 		return
 	}

src/cmd/vet/types.go

@@ -8,14 +8,15 @@ package main
 
 import (
 	"go/ast"
+	"go/importer"
 	"go/token"
-
-	"golang.org/x/tools/go/types"
+	"go/types"
 )
 
-// imports is the canonical map of imported packages we need for typechecking.
-// It is created during initialization.
-var imports = make(map[string]*types.Package)
+// stdImporter is the importer we use to import packages.
+// It is created during initialization so that all packages
+// are imported by the same importer.
+var stdImporter = importer.Default()
 
 var (
 	stringerMethodType = types.New("func() string")
@@ -35,7 +36,7 @@ func init() {
 // path.name, and adds the respective package to the imports map
 // as a side effect.
 func importType(path, name string) types.Type {
-	pkg, err := types.DefaultImport(imports, path)
+	pkg, err := stdImporter.Import(path)
 	if err != nil {
 		// This can happen if fmt hasn't been compiled yet.
 		// Since nothing uses formatterType anyway, don't complain.
@@ -56,9 +57,9 @@ func (pkg *Package) check(fs *token.FileSet, astFiles []*ast.File) error {
 	pkg.spans = make(map[types.Object]Span)
 	pkg.types = make(map[ast.Expr]types.TypeAndValue)
 	config := types.Config{
-		// We provide the same packages map for all imports to ensure
-		// that everybody sees identical packages for the given paths.
-		Packages: imports,
+		// We use the same importer for all imports to ensure that
+		// everybody sees identical packages for the given paths.
+		Importer: stdImporter,
 		// By providing a Config with our own error function, it will continue
 		// past the first error. There is no need for that function to do anything.
 		Error: func(error) {},

src/cmd/vet/unsafeptr.go

@@ -9,8 +9,7 @@ package main
 import (
 	"go/ast"
 	"go/token"
-
-	"golang.org/x/tools/go/types"
+	"go/types"
 )
 
 func init() {

src/cmd/vet/unused.go

@@ -11,9 +11,8 @@ import (
 	"flag"
 	"go/ast"
 	"go/token"
+	"go/types"
 	"strings"
-
-	"golang.org/x/tools/go/types"
 )
 
 var unusedFuncsFlag = flag.String("unusedfuncs",

src/cmd/vet/vet_test.go

@@ -87,7 +87,7 @@ func TestTags(t *testing.T) {
 		"-v", // We're going to look at the files it examines.
 		"testdata/tagtest",
 	}
-	cmd = exec.Command(filepath.Join(".", binary), args...)
+	cmd = exec.Command("./"+binary, args...)
 	output, err := cmd.CombinedOutput()
 	if err != nil {
 		t.Fatal(err)

src/cmd/vet/whitelist/whitelist.go

@@ -3,7 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // Package whitelist defines exceptions for the vet tool.
-package whitelist // import "golang.org/x/tools/cmd/vet/whitelist"
+package whitelist // import "cmd/vet/whitelist"
 
 // UnkeyedLiteral are types that are actually slices, but
 // syntactically, we cannot tell whether the Typ in pkg.Typ{1, 2, 3}