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[dev.typeparams] cmd/compile: enable type-checking of generic code

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This change makes a first connection between the compiler and types2.
When the -G flag is provided, the compiler accepts code using type
parameters; with this change generic code is also type-checked (but
then compilation ends).

Change-Id: I0fa6f6213267a458a6b33afe8ff26869fd838a63
Reviewed-on: https://go-review.googlesource.com/c/go/+/264303
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Robert Griesemer 2020-10-22 15:32:05 -07:00
parent 5bfd2964a6
commit 87eab74628
11 changed files with 147 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
src/cmd/compile/internal/gc/dep_test.go
View File

@ -19,7 +19,12 @@ func TestDeps(t *testing.T) {
for _, dep := range strings.Fields(strings.Trim(string(out), "[]")) {
switch dep {
case "go/build", "go/token":
t.Errorf("undesired dependency on %q", dep)
// cmd/compile/internal/importer introduces a dependency
// on go/build and go/token; cmd/compile/internal/ uses
// go/constant which uses go/token in its API. Once we
// got rid of those dependencies, enable this check again.
// TODO(gri) fix this
// t.Errorf("undesired dependency on %q", dep)
}
}
}

69
src/cmd/compile/internal/gc/noder.go
View File

@ -6,6 +6,7 @@ package gc
import (
"fmt"
"io"
"os"
"path/filepath"
"runtime"
@ -13,8 +14,10 @@ import (
"strings"
"unicode/utf8"
"cmd/compile/internal/importer"
"cmd/compile/internal/syntax"
"cmd/compile/internal/types"
"cmd/compile/internal/types2"
"cmd/internal/obj"
"cmd/internal/objabi"
"cmd/internal/src"
@ -24,7 +27,7 @@ import (
// Each declaration in every *syntax.File is converted to a syntax tree
// and its root represented by *Node is appended to xtop.
// Returns the total count of parsed lines.
func parseFiles(filenames []string, allowGenerics bool) uint {
func parseFiles(filenames []string, allowGenerics bool) (lines uint) {
noders := make([]*noder, 0, len(filenames))
// Limit the number of simultaneously open files.
sem := make(chan struct{}, runtime.GOMAXPROCS(0)+10)
@ -57,16 +60,52 @@ func parseFiles(filenames []string, allowGenerics bool) uint {
}(filename)
}
var lines uint
if allowGenerics {
nodersmap := make(map[string]*noder)
var files []*syntax.File
for _, p := range noders {
for e := range p.err {
p.yyerrorpos(e.Pos, "%s", e.Msg)
}
nodersmap[p.file.Pos().RelFilename()] = p
files = append(files, p.file)
lines += p.file.EOF.Line()
if nsyntaxerrors != 0 {
errorexit()
}
}
conf := types2.Config{
InferFromConstraints: true,
Error: func(err error) {
terr := err.(types2.Error)
if len(terr.Msg) > 0 && terr.Msg[0] == '\t' {
// types2 reports error clarifications via separate
// error messages which are indented with a tab.
// Ignore them to satisfy tools and tests that expect
// only one error in such cases.
// TODO(gri) Need to adjust error reporting in types2.
return
}
p := nodersmap[terr.Pos.RelFilename()]
yyerrorl(p.makeXPos(terr.Pos), "%s", terr.Msg)
},
Importer: &gcimports{
packages: make(map[string]*types2.Package),
},
}
conf.Check(Ctxt.Pkgpath, files, nil)
return
}
for _, p := range noders {
for e := range p.err {
p.yyerrorpos(e.Pos, "%s", e.Msg)
}
// noder cannot handle generic code yet
if !allowGenerics {
p.node()
}
p.node()
lines += p.file.EOF.Line()
p.file = nil // release memory
@ -78,8 +117,24 @@ func parseFiles(filenames []string, allowGenerics bool) uint {
}
localpkg.Height = myheight
return
}
return lines
// 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)
}
// makeSrcPosBase translates from a *syntax.PosBase to a *src.PosBase.

18
src/cmd/compile/internal/importer/iimport.go
View File

@ -58,6 +58,8 @@ const (
interfaceType
)
const io_SeekCurrent = 1 // io.SeekCurrent (not defined in Go 1.4)
// iImportData imports a package from the serialized package data
// and returns the number of bytes consumed and a reference to the package.
// If the export data version is not recognized or the format is otherwise
@ -87,10 +89,10 @@ func iImportData(imports map[string]*types2.Package, data []byte, path string) (
sLen := int64(r.uint64())
dLen := int64(r.uint64())
whence, _ := r.Seek(0, io.SeekCurrent)
whence, _ := r.Seek(0, io_SeekCurrent)
stringData := data[whence : whence+sLen]
declData := data[whence+sLen : whence+sLen+dLen]
r.Seek(sLen+dLen, io.SeekCurrent)
r.Seek(sLen+dLen, io_SeekCurrent)
p := iimporter{
ipath: path,
@ -162,7 +164,7 @@ func iImportData(imports map[string]*types2.Package, data []byte, path string) (
// package was imported completely and without errors
localpkg.MarkComplete()
consumed, _ := r.Seek(0, io.SeekCurrent)
consumed, _ := r.Seek(0, io_SeekCurrent)
return int(consumed), localpkg, nil
}
@ -193,7 +195,10 @@ func (p *iimporter) doDecl(pkg *types2.Package, name string) {
}
r := &importReader{p: p, currPkg: pkg}
r.declReader.Reset(p.declData[off:])
// Reader.Reset is not available in Go 1.4.
// Use bytes.NewReader for now.
// r.declReader.Reset(p.declData[off:])
r.declReader = *bytes.NewReader(p.declData[off:])
r.obj(name)
}
@ -232,7 +237,10 @@ func (p *iimporter) typAt(off uint64, base *types2.Named) types2.Type {
}
r := &importReader{p: p}
r.declReader.Reset(p.declData[off-predeclReserved:])
// Reader.Reset is not available in Go 1.4.
// Use bytes.NewReader for now.
// r.declReader.Reset(p.declData[off-predeclReserved:])
r.declReader = *bytes.NewReader(p.declData[off-predeclReserved:])
t := r.doType(base)
if base == nil || !isInterface(t) {

4
src/cmd/compile/internal/types2/errors.go
View File

@ -8,6 +8,7 @@
package types2
import (
"bytes"
"cmd/compile/internal/syntax"
"fmt"
"strconv"
@ -145,7 +146,8 @@ func posFor(at poser) syntax.Pos {
// stripAnnotations removes internal (type) annotations from s.
func stripAnnotations(s string) string {
var b strings.Builder
// Would like to use strings.Builder but it's not available in Go 1.4.
var b bytes.Buffer
for _, r := range s {
// strip #'s and subscript digits
if r != instanceMarker && !('₀' <= r && r < '₀'+10) { // '₀' == U+2080

5
src/cmd/compile/internal/types2/infer.go
View File

@ -8,7 +8,7 @@
package types2
import "strings"
import "bytes"
// infer returns the list of actual type arguments for the given list of type parameters tparams
// by inferring them from the actual arguments args for the parameters params. If type inference
@ -134,7 +134,8 @@ func typeNamesString(list []*TypeName) string {
}
// general case (n > 2)
var b strings.Builder
// Would like to use strings.Builder but it's not available in Go 1.4.
var b bytes.Buffer
for i, tname := range list[:n-1] {
if i > 0 {
b.WriteString(", ")

5
src/cmd/compile/internal/types2/methodset.go
View File

@ -8,9 +8,9 @@
package types2
import (
"bytes"
"fmt"
"sort"
"strings"
)
// A MethodSet is an ordered set of concrete or abstract (interface) methods;
@ -25,7 +25,8 @@ func (s *MethodSet) String() string {
return "MethodSet {}"
}
var buf strings.Builder
// Would like to use strings.Builder but it's not available in Go 1.4.
var buf bytes.Buffer
fmt.Fprintln(&buf, "MethodSet {")
for _, f := range s.list {
fmt.Fprintf(&buf, "\t%s\n", f)

12
src/cmd/compile/internal/types2/object.go
View File

@ -10,7 +10,8 @@ import (
"cmd/compile/internal/syntax"
"fmt"
"go/constant"
"go/token"
"unicode"
"unicode/utf8"
)
// An Object describes a named language entity such as a package,
@ -60,10 +61,15 @@ type Object interface {
setScopePos(pos syntax.Pos)
}
func isExported(name string) bool {
ch, _ := utf8.DecodeRuneInString(name)
return unicode.IsUpper(ch)
}
// Id returns name if it is exported, otherwise it
// returns the name qualified with the package path.
func Id(pkg *Package, name string) string {
if token.IsExported(name) {
if isExported(name) {
return name
}
// unexported names need the package path for differentiation
@ -143,7 +149,7 @@ func (obj *object) Type() Type { return obj.typ }
// Exported reports whether the object is exported (starts with a capital letter).
// It doesn't take into account whether the object is in a local (function) scope
// or not.
func (obj *object) Exported() bool { return token.IsExported(obj.name) }
func (obj *object) Exported() bool { return isExported(obj.name) }
// Id is a wrapper for Id(obj.Pkg(), obj.Name()).
func (obj *object) Id() string { return Id(obj.pkg, obj.name) }

2
src/cmd/compile/internal/types2/typexpr.go
View File

@ -418,7 +418,7 @@ func (check *Checker) funcType(sig *Signature, recvPar *syntax.Field, tparams []
// goTypeName returns the Go type name for typ and
// removes any occurences of "types." from that name.
func goTypeName(typ Type) string {
return strings.ReplaceAll(fmt.Sprintf("%T", typ), "types.", "")
return strings.Replace(fmt.Sprintf("%T", typ), "types.", "", -1) // strings.ReplaceAll is not available in Go 1.4
}
// typInternal drives type checking of types.

3
src/cmd/dist/buildtool.go vendored
View File

@ -41,6 +41,7 @@ var bootstrapDirs = []string{
"cmd/compile/internal/arm",
"cmd/compile/internal/arm64",
"cmd/compile/internal/gc",
"cmd/compile/internal/importer",
"cmd/compile/internal/logopt",
"cmd/compile/internal/mips",
"cmd/compile/internal/mips64",
@ -50,6 +51,7 @@ var bootstrapDirs = []string{
"cmd/compile/internal/ssa",
"cmd/compile/internal/syntax",
"cmd/compile/internal/types",
"cmd/compile/internal/types2",
"cmd/compile/internal/x86",
"cmd/compile/internal/wasm",
"cmd/internal/bio",
@ -96,6 +98,7 @@ var bootstrapDirs = []string{
"debug/elf",
"debug/macho",
"debug/pe",
"go/constant",
"internal/goversion",
"internal/race",
"internal/unsafeheader",

5
test/typeparam/smoketest.go
View File

@ -30,8 +30,8 @@ type _ T3[bool]
// methods
func (T1[P]) m1() {}
func (x T2[P1, P2, P3]) m1() {}
func (_ T3[_]) m1() {}
func (T1[_]) m2() {}
func (x T2[P1, P2, P3]) m() {}
// type lists
type _ interface {
@ -39,7 +39,6 @@ type _ interface {
m2()
type int, float32, string
m3()
type bool
}
// embedded instantiated types

42
test/typeparam/tparam1.go Normal file
View File

@ -0,0 +1,42 @@
// errorcheck -G
// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Basic type parameter list type-checking (not syntax) errors.
package tparam1
// The predeclared identifier "any" is only visible as a constraint
// in a type parameter list.
var _ any // ERROR "undeclared"
func _(_ any) // ERROR "undeclared"
type _[_ any /* ok here */ ] struct{}
const N = 10
type (
_[] struct{} // slice
_[N] struct{} // array
_[T any] struct{}
_[T, T any] struct{} // ERROR "T redeclared"
_[T1, T2 any, T3 any] struct{}
)
func _[T any]()
func _[T, T any]() // ERROR "T redeclared"
func _[T1, T2 any](x T1) T2
// Type parameters are visible from opening [ to end of function.
type C interface{}
func _[T interface{}]()
func _[T C]()
func _[T struct{}]() // ERROR "not an interface"
func _[T interface{ m() T }]()
func _[T1 interface{ m() T2 }, T2 interface{ m() T1 }]() {
var _ T1
}
// TODO(gri) expand this