qbit/go
1
0
Fork 0
mirror of https://github.com/golang/go synced 2024-11-22 20:24:47 -07:00
Code Releases Activity

[dev.typeparams] cmd/compile: refactor import logic

Browse Source 
This CL refactors noder's package import logic so it's easier to reuse
with types2 and gcimports. In particular, this allows the types2
integration to now support vendored packages.

Change-Id: I1fd98ad612b4683d2e1ac640839e64de1fa7324b
Reviewed-on: https://go-review.googlesource.com/c/go/+/282919
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Robert Griesemer <gri@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Matthew Dempsky 2021-01-08 23:44:31 -08:00
parent 106aa941df
commit 099599662d
5 changed files with 142 additions and 166 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

266
src/cmd/compile/internal/noder/import.go
View File

@ -5,20 +5,25 @@
package noder
import (
"errors"
"fmt"
"go/constant"
"io"
"os"
"path"
pathpkg "path"
"runtime"
"sort"
"strconv"
"strings"
"unicode"
"unicode/utf8"
"cmd/compile/internal/base"
"cmd/compile/internal/importer"
"cmd/compile/internal/ir"
"cmd/compile/internal/syntax"
"cmd/compile/internal/typecheck"
"cmd/compile/internal/types"
"cmd/compile/internal/types2"
"cmd/internal/archive"
"cmd/internal/bio"
"cmd/internal/goobj"
@ -26,6 +31,29 @@ import (
"cmd/internal/src"
)
// Temporary import helper to get type2-based type-checking going.
type gcimports struct {
packages map[string]*types2.Package
}
func (m *gcimports) Import(path string) (*types2.Package, error) {
return m.ImportFrom(path, "" /* no vendoring */, 0)
}
func (m *gcimports) ImportFrom(path, srcDir string, mode types2.ImportMode) (*types2.Package, error) {
if mode != 0 {
panic("mode must be 0")
}
path, err := resolveImportPath(path)
if err != nil {
return nil, err
}
lookup := func(path string) (io.ReadCloser, error) { return openPackage(path) }
return importer.Import(m.packages, path, srcDir, lookup)
}
func isDriveLetter(b byte) bool {
return 'a' <= b && b <= 'z' || 'A' <= b && b <= 'Z'
}
@ -38,160 +66,152 @@ func islocalname(name string) bool {
strings.HasPrefix(name, "../") || name == ".."
}
func findpkg(name string) (file string, ok bool) {
if islocalname(name) {
func openPackage(path string) (*os.File, error) {
if islocalname(path) {
if base.Flag.NoLocalImports {
return "", false
return nil, errors.New("local imports disallowed")
}
if base.Flag.Cfg.PackageFile != nil {
file, ok = base.Flag.Cfg.PackageFile[name]
return file, ok
return os.Open(base.Flag.Cfg.PackageFile[path])
}
// try .a before .6. important for building libraries:
// if there is an array.6 in the array.a library,
// want to find all of array.a, not just array.6.
file = fmt.Sprintf("%s.a", name)
if _, err := os.Stat(file); err == nil {
return file, true
// try .a before .o. important for building libraries:
// if there is an array.o in the array.a library,
// want to find all of array.a, not just array.o.
if file, err := os.Open(fmt.Sprintf("%s.a", path)); err == nil {
return file, nil
}
file = fmt.Sprintf("%s.o", name)
if _, err := os.Stat(file); err == nil {
return file, true
if file, err := os.Open(fmt.Sprintf("%s.o", path)); err == nil {
return file, nil
}
return "", false
return nil, errors.New("file not found")
}
// local imports should be canonicalized already.
// don't want to see "encoding/../encoding/base64"
// as different from "encoding/base64".
if q := path.Clean(name); q != name {
base.Errorf("non-canonical import path %q (should be %q)", name, q)
return "", false
if q := pathpkg.Clean(path); q != path {
return nil, fmt.Errorf("non-canonical import path %q (should be %q)", path, q)
}
if base.Flag.Cfg.PackageFile != nil {
file, ok = base.Flag.Cfg.PackageFile[name]
return file, ok
return os.Open(base.Flag.Cfg.PackageFile[path])
}
for _, dir := range base.Flag.Cfg.ImportDirs {
file = fmt.Sprintf("%s/%s.a", dir, name)
if _, err := os.Stat(file); err == nil {
return file, true
if file, err := os.Open(fmt.Sprintf("%s/%s.a", dir, path)); err == nil {
return file, nil
}
file = fmt.Sprintf("%s/%s.o", dir, name)
if _, err := os.Stat(file); err == nil {
return file, true
if file, err := os.Open(fmt.Sprintf("%s/%s.o", dir, path)); err == nil {
return file, nil
}
}
if objabi.GOROOT != "" {
suffix := ""
suffixsep := ""
if base.Flag.InstallSuffix != "" {
suffixsep = "_"
suffix = base.Flag.InstallSuffix
suffix = "_" + base.Flag.InstallSuffix
} else if base.Flag.Race {
suffixsep = "_"
suffix = "race"
suffix = "_race"
} else if base.Flag.MSan {
suffixsep = "_"
suffix = "msan"
suffix = "_msan"
}
file = fmt.Sprintf("%s/pkg/%s_%s%s%s/%s.a", objabi.GOROOT, objabi.GOOS, objabi.GOARCH, suffixsep, suffix, name)
if _, err := os.Stat(file); err == nil {
return file, true
if file, err := os.Open(fmt.Sprintf("%s/pkg/%s_%s%s/%s.a", objabi.GOROOT, objabi.GOOS, objabi.GOARCH, suffix, path)); err == nil {
return file, nil
}
file = fmt.Sprintf("%s/pkg/%s_%s%s%s/%s.o", objabi.GOROOT, objabi.GOOS, objabi.GOARCH, suffixsep, suffix, name)
if _, err := os.Stat(file); err == nil {
return file, true
if file, err := os.Open(fmt.Sprintf("%s/pkg/%s_%s%s/%s.o", objabi.GOROOT, objabi.GOOS, objabi.GOARCH, suffix, path)); err == nil {
return file, nil
}
}
return "", false
return nil, errors.New("file not found")
}
// myheight tracks the local package's height based on packages
// imported so far.
var myheight int
func importfile(f constant.Value) *types.Pkg {
if f.Kind() != constant.String {
base.Errorf("import path must be a string")
return nil
}
path_ := constant.StringVal(f)
if len(path_) == 0 {
base.Errorf("import path is empty")
return nil
}
if isbadimport(path_, false) {
return nil
}
// resolveImportPath resolves an import path as it appears in a Go
// source file to the package's full path.
func resolveImportPath(path string) (string, error) {
// The package name main is no longer reserved,
// but we reserve the import path "main" to identify
// the main package, just as we reserve the import
// path "math" to identify the standard math package.
if path_ == "main" {
base.Errorf("cannot import \"main\"")
base.ErrorExit()
if path == "main" {
return "", errors.New("cannot import \"main\"")
}
if base.Ctxt.Pkgpath != "" && path_ == base.Ctxt.Pkgpath {
base.Errorf("import %q while compiling that package (import cycle)", path_)
base.ErrorExit()
if base.Ctxt.Pkgpath != "" && path == base.Ctxt.Pkgpath {
return "", fmt.Errorf("import %q while compiling that package (import cycle)", path)
}
if mapped, ok := base.Flag.Cfg.ImportMap[path_]; ok {
path_ = mapped
if mapped, ok := base.Flag.Cfg.ImportMap[path]; ok {
path = mapped
}
if path_ == "unsafe" {
return ir.Pkgs.Unsafe
if islocalname(path) {
if path[0] == '/' {
return "", errors.New("import path cannot be absolute path")
}
if islocalname(path_) {
if path_[0] == '/' {
base.Errorf("import path cannot be absolute path")
return nil
prefix := base.Flag.D
if prefix == "" {
// Questionable, but when -D isn't specified, historically we
// resolve local import paths relative to the directory the
// compiler's current directory, not the respective source
// file's directory.
prefix = base.Ctxt.Pathname
}
path = pathpkg.Join(prefix, path)
prefix := base.Ctxt.Pathname
if base.Flag.D != "" {
prefix = base.Flag.D
}
path_ = path.Join(prefix, path_)
if isbadimport(path_, true) {
return nil
if err := checkImportPath(path, true); err != nil {
return "", err
}
}
file, found := findpkg(path_)
if !found {
base.Errorf("can't find import: %q", path_)
base.ErrorExit()
return path, nil
}
importpkg := types.NewPkg(path_, "")
if importpkg.Imported {
return importpkg
}
importpkg.Imported = true
imp, err := bio.Open(file)
// TODO(mdempsky): Return an error instead.
func importfile(decl *syntax.ImportDecl) *types.Pkg {
path, err := strconv.Unquote(decl.Path.Value)
if err != nil {
base.Errorf("can't open import: %q: %v", path_, err)
base.Errorf("import path must be a string")
return nil
}
if err := checkImportPath(path, false); err != nil {
base.Errorf("%s", err.Error())
return nil
}
path, err = resolveImportPath(path)
if err != nil {
base.Errorf("%s", err)
return nil
}
importpkg := types.NewPkg(path, "")
if importpkg.Direct {
return importpkg // already fully loaded
}
importpkg.Direct = true
typecheck.Target.Imports = append(typecheck.Target.Imports, importpkg)
if path == "unsafe" {
return importpkg // initialized with universe
}
f, err := openPackage(path)
if err != nil {
base.Errorf("could not import %q: %v", path, err)
base.ErrorExit()
}
imp := bio.NewReader(f)
defer imp.Close()
file := f.Name()
// check object header
p, err := imp.ReadString('\n')
@ -261,12 +281,12 @@ func importfile(f constant.Value) *types.Pkg {
var fingerprint goobj.FingerprintType
switch c {
case '\n':
base.Errorf("cannot import %s: old export format no longer supported (recompile library)", path_)
base.Errorf("cannot import %s: old export format no longer supported (recompile library)", path)
return nil
case 'B':
if base.Debug.Export != 0 {
fmt.Printf("importing %s (%s)\n", path_, file)
fmt.Printf("importing %s (%s)\n", path, file)
}
imp.ReadByte() // skip \n after $$B
@ -285,17 +305,17 @@ func importfile(f constant.Value) *types.Pkg {
fingerprint = typecheck.ReadImports(importpkg, imp)
default:
base.Errorf("no import in %q", path_)
base.Errorf("no import in %q", path)
base.ErrorExit()
}
// assume files move (get installed) so don't record the full path
if base.Flag.Cfg.PackageFile != nil {
// If using a packageFile map, assume path_ can be recorded directly.
base.Ctxt.AddImport(path_, fingerprint)
base.Ctxt.AddImport(path, fingerprint)
} else {
// For file "/Users/foo/go/pkg/darwin_amd64/math.a" record "math.a".
base.Ctxt.AddImport(file[len(file)-len(path_)-len(".a"):], fingerprint)
base.Ctxt.AddImport(file[len(file)-len(path)-len(".a"):], fingerprint)
}
if importpkg.Height >= myheight {
@ -315,47 +335,37 @@ var reservedimports = []string{
"type",
}
func isbadimport(path string, allowSpace bool) bool {
func checkImportPath(path string, allowSpace bool) error {
if path == "" {
return errors.New("import path is empty")
}
if strings.Contains(path, "\x00") {
base.Errorf("import path contains NUL")
return true
return errors.New("import path contains NUL")
}
for _, ri := range reservedimports {
if path == ri {
base.Errorf("import path %q is reserved and cannot be used", path)
return true
return fmt.Errorf("import path %q is reserved and cannot be used", path)
}
}
for _, r := range path {
if r == utf8.RuneError {
base.Errorf("import path contains invalid UTF-8 sequence: %q", path)
return true
}
if r < 0x20 || r == 0x7f {
base.Errorf("import path contains control character: %q", path)
return true
}
if r == '\\' {
base.Errorf("import path contains backslash; use slash: %q", path)
return true
}
if !allowSpace && unicode.IsSpace(r) {
base.Errorf("import path contains space character: %q", path)
return true
}
if strings.ContainsRune("!\"#$%&'()*,:;<=>?[]^`{|}", r) {
base.Errorf("import path contains invalid character '%c': %q", r, path)
return true
switch {
case r == utf8.RuneError:
return fmt.Errorf("import path contains invalid UTF-8 sequence: %q", path)
case r < 0x20 || r == 0x7f:
return fmt.Errorf("import path contains control character: %q", path)
case r == '\\':
return fmt.Errorf("import path contains backslash; use slash: %q", path)
case !allowSpace && unicode.IsSpace(r):
return fmt.Errorf("import path contains space character: %q", path)
case strings.ContainsRune("!\"#$%&'()*,:;<=>?[]^`{|}", r):
return fmt.Errorf("import path contains invalid character '%c': %q", r, path)
}
}
return false
return nil
}
func pkgnotused(lineno src.XPos, path string, name string) {

33
src/cmd/compile/internal/noder/noder.go
View File

@ -9,7 +9,6 @@ import (
"fmt"
"go/constant"
"go/token"
"io"
"os"
"path/filepath"
"runtime"
@ -20,7 +19,6 @@ import (
"cmd/compile/internal/base"
"cmd/compile/internal/dwarfgen"
"cmd/compile/internal/importer"
"cmd/compile/internal/ir"
"cmd/compile/internal/syntax"
"cmd/compile/internal/typecheck"
@ -126,13 +124,6 @@ func ParseFiles(filenames []string) (lines uint) {
},
Importer: &gcimports{
packages: make(map[string]*types2.Package),
lookup: func(path string) (io.ReadCloser, error) {
file, ok := findpkg(path)
if !ok {
return nil, fmt.Errorf("can't find import: %q", path)
}
return os.Open(file)
},
},
Sizes: &gcSizes{},
}
@ -255,23 +246,6 @@ func Package() {
}
// Temporary import helper to get type2-based type-checking going.
type gcimports struct {
packages map[string]*types2.Package
lookup func(path string) (io.ReadCloser, error)
}
func (m *gcimports) Import(path string) (*types2.Package, error) {
return m.ImportFrom(path, "" /* no vendoring */, 0)
}
func (m *gcimports) ImportFrom(path, srcDir string, mode types2.ImportMode) (*types2.Package, error) {
if mode != 0 {
panic("mode must be 0")
}
return importer.Import(m.packages, path, srcDir, m.lookup)
}
func (p *noder) errorAt(pos syntax.Pos, format string, args ...interface{}) {
base.ErrorfAt(p.makeXPos(pos), format, args...)
}
@ -483,7 +457,7 @@ func (p *noder) importDecl(imp *syntax.ImportDecl) {
p.checkUnused(pragma)
}
ipkg := importfile(p.basicLit(imp.Path))
ipkg := importfile(imp)
if ipkg == nil {
if base.Errors() == 0 {
base.Fatalf("phase error in import")
@ -498,11 +472,6 @@ func (p *noder) importDecl(imp *syntax.ImportDecl) {
p.importedEmbed = true
}
if !ipkg.Direct {
typecheck.Target.Imports = append(typecheck.Target.Imports, ipkg)
}
ipkg.Direct = true
var my *types.Sym
if imp.LocalPkgName != nil {
my = p.name(imp.LocalPkgName)

1
src/cmd/compile/internal/types/pkg.go
View File

@ -31,7 +31,6 @@ type Pkg struct {
// height of their imported packages.
Height int
Imported bool // export data of this package was parsed
Direct bool // imported directly
}

3
test/fixedbugs/issue11362.go
View File

@ -8,8 +8,7 @@
package main
import _ "unicode//utf8" // GC_ERROR "non-canonical import path .unicode//utf8. \(should be .unicode/utf8.\)" "can't find import: .unicode//utf8."
import _ "unicode//utf8" // GC_ERROR "non-canonical import path .unicode//utf8. \(should be .unicode/utf8.\)"
func main() {
}

1
test/run.go
View File

@ -1954,7 +1954,6 @@ var excluded = map[string]bool{
"fixedbugs/bug388.go": true, // types2 not run due to syntax errors
"fixedbugs/bug412.go": true, // types2 produces a follow-on error
"fixedbugs/issue11362.go": true, // types2 import path handling
"fixedbugs/issue11590.go": true, // types2 doesn't report a follow-on error (pref: types2)
"fixedbugs/issue11610.go": true, // types2 not run after syntax errors
"fixedbugs/issue11614.go": true, // types2 reports an extra error