mirror of
https://github.com/golang/go
synced 2024-11-22 20:50:05 -07:00
[dev.typeparams] go/types: move newTypeSet function into typeset.go
This is a straightforward port of CL 331515 to go/types. Change-Id: I05c687e7dd7a64a8a7815c4483ff7fbb06b37627 Reviewed-on: https://go-review.googlesource.com/c/go/+/335031 Trust: Robert Findley <rfindley@google.com> Run-TryBot: Robert Findley <rfindley@google.com> Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Rob Findley
Robert Findley
parent
fe4f13404d
commit
79955155e9
@ -5,11 +5,9 @@
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package types
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import (
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"fmt"
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"go/ast"
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"go/internal/typeparams"
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"go/token"
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"sort"
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)
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func (check *Checker) interfaceType(ityp *Interface, iface *ast.InterfaceType, def *Named) {
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@ -131,184 +129,3 @@ func flattenUnion(list []ast.Expr, x ast.Expr) []ast.Expr {
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}
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return append(list, x)
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}
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// newTypeSet may be called with check == nil.
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// TODO(gri) move this function into typeset.go eventually
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func newTypeSet(check *Checker, pos token.Pos, ityp *Interface) *TypeSet {
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if ityp.tset != nil {
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return ityp.tset
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}
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// If the interface is not fully set up yet, the type set will
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// not be complete, which may lead to errors when using the the
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// type set (e.g. missing method). Don't compute a partial type
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// set (and don't store it!), so that we still compute the full
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// type set eventually. Instead, return the top type set and
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// let any follow-on errors play out.
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//
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// TODO(gri) Consider recording when this happens and reporting
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// it as an error (but only if there were no other errors so to
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// to not have unnecessary follow-on errors).
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if !ityp.complete {
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return &topTypeSet
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}
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if check != nil && trace {
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// Types don't generally have position information.
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// If we don't have a valid pos provided, try to use
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// one close enough.
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if !pos.IsValid() && len(ityp.methods) > 0 {
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pos = ityp.methods[0].pos
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}
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check.trace(pos, "type set for %s", ityp)
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check.indent++
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defer func() {
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check.indent--
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check.trace(pos, "=> %s ", ityp.typeSet())
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}()
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}
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// An infinitely expanding interface (due to a cycle) is detected
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// elsewhere (Checker.validType), so here we simply assume we only
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// have valid interfaces. Mark the interface as complete to avoid
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// infinite recursion if the validType check occurs later for some
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// reason.
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ityp.tset = new(TypeSet) // TODO(gri) is this sufficient?
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// Methods of embedded interfaces are collected unchanged; i.e., the identity
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// of a method I.m's Func Object of an interface I is the same as that of
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// the method m in an interface that embeds interface I. On the other hand,
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// if a method is embedded via multiple overlapping embedded interfaces, we
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// don't provide a guarantee which "original m" got chosen for the embedding
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// interface. See also issue #34421.
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//
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// If we don't care to provide this identity guarantee anymore, instead of
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// reusing the original method in embeddings, we can clone the method's Func
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// Object and give it the position of a corresponding embedded interface. Then
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// we can get rid of the mpos map below and simply use the cloned method's
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// position.
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var todo []*Func
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var seen objset
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var methods []*Func
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mpos := make(map[*Func]token.Pos) // method specification or method embedding position, for good error messages
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addMethod := func(pos token.Pos, m *Func, explicit bool) {
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switch other := seen.insert(m); {
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case other == nil:
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methods = append(methods, m)
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mpos[m] = pos
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case explicit:
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if check == nil {
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panic(fmt.Sprintf("%v: duplicate method %s", m.pos, m.name))
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}
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// check != nil
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check.errorf(atPos(pos), _DuplicateDecl, "duplicate method %s", m.name)
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check.errorf(atPos(mpos[other.(*Func)]), _DuplicateDecl, "\tother declaration of %s", m.name) // secondary error, \t indented
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default:
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// We have a duplicate method name in an embedded (not explicitly declared) method.
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// Check method signatures after all types are computed (issue #33656).
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// If we're pre-go1.14 (overlapping embeddings are not permitted), report that
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// error here as well (even though we could do it eagerly) because it's the same
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// error message.
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if check == nil {
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// check method signatures after all locally embedded interfaces are computed
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todo = append(todo, m, other.(*Func))
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break
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}
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// check != nil
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check.later(func() {
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if !check.allowVersion(m.pkg, 1, 14) || !Identical(m.typ, other.Type()) {
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check.errorf(atPos(pos), _DuplicateDecl, "duplicate method %s", m.name)
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check.errorf(atPos(mpos[other.(*Func)]), _DuplicateDecl, "\tother declaration of %s", m.name) // secondary error, \t indented
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}
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})
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}
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}
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for _, m := range ityp.methods {
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addMethod(m.pos, m, true)
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}
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// collect embedded elements
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var allTypes Type
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for i, typ := range ityp.embeddeds {
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// The embedding position is nil for imported interfaces
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// and also for interface copies after substitution (but
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// in that case we don't need to report errors again).
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var pos token.Pos // embedding position
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if ityp.embedPos != nil {
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pos = (*ityp.embedPos)[i]
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}
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var types Type
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switch t := under(typ).(type) {
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case *Interface:
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tset := newTypeSet(check, pos, t)
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for _, m := range tset.methods {
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addMethod(pos, m, false) // use embedding position pos rather than m.pos
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}
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types = tset.types
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case *Union:
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// TODO(gri) combine with default case once we have
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// converted all tests to new notation and we
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// can report an error when we don't have an
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// interface before go1.18.
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types = typ
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case *TypeParam:
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if check != nil && !check.allowVersion(check.pkg, 1, 18) {
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check.errorf(atPos(pos), _InvalidIfaceEmbed, "%s is a type parameter, not an interface", typ)
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continue
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}
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types = typ
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default:
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if typ == Typ[Invalid] {
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continue
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}
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if check != nil && !check.allowVersion(check.pkg, 1, 18) {
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check.errorf(atPos(pos), _InvalidIfaceEmbed, "%s is not an interface", typ)
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continue
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}
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types = typ
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}
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allTypes = intersect(allTypes, types)
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}
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ityp.embedPos = nil // not needed anymore (errors have been reported)
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// process todo's (this only happens if check == nil)
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for i := 0; i < len(todo); i += 2 {
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m := todo[i]
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other := todo[i+1]
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if !Identical(m.typ, other.typ) {
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panic(fmt.Sprintf("%v: duplicate method %s", m.pos, m.name))
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}
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}
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if methods != nil {
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sort.Sort(byUniqueMethodName(methods))
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ityp.tset.methods = methods
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}
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ityp.tset.types = allTypes
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return ityp.tset
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}
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func sortMethods(list []*Func) {
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sort.Sort(byUniqueMethodName(list))
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}
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func assertSortedMethods(list []*Func) {
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if !debug {
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panic("internal error: assertSortedMethods called outside debug mode")
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}
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if !sort.IsSorted(byUniqueMethodName(list)) {
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panic("internal error: methods not sorted")
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}
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}
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// byUniqueMethodName method lists can be sorted by their unique method names.
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type byUniqueMethodName []*Func
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func (a byUniqueMethodName) Len() int { return len(a) }
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func (a byUniqueMethodName) Less(i, j int) bool { return a[i].Id() < a[j].Id() }
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func (a byUniqueMethodName) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
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@ -6,10 +6,13 @@ package types
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import (
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"bytes"
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"fmt"
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"go/token"
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"sort"
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)
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// topTypeSet may be used as type set for the empty interface.
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var topTypeSet TypeSet
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// ----------------------------------------------------------------------------
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// API
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// A TypeSet represents the type set of an interface.
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type TypeSet struct {
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@ -18,6 +21,31 @@ type TypeSet struct {
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types Type // typically a *Union; nil means no type restrictions
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}
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// IsTop reports whether type set s is the top type set (corresponding to the empty interface).
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func (s *TypeSet) IsTop() bool { return len(s.methods) == 0 && s.types == nil }
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// IsMethodSet reports whether the type set s is described by a single set of methods.
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func (s *TypeSet) IsMethodSet() bool { return s.types == nil && !s.IsComparable() }
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// IsComparable reports whether each type in the set is comparable.
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func (s *TypeSet) IsComparable() bool {
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_, m := s.LookupMethod(nil, "==")
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return m != nil
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}
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// NumMethods returns the number of methods available.
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func (s *TypeSet) NumMethods() int { return len(s.methods) }
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// Method returns the i'th method of type set s for 0 <= i < s.NumMethods().
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// The methods are ordered by their unique ID.
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func (s *TypeSet) Method(i int) *Func { return s.methods[i] }
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// LookupMethod returns the index of and method with matching package and name, or (-1, nil).
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func (s *TypeSet) LookupMethod(pkg *Package, name string) (int, *Func) {
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// TODO(gri) s.methods is sorted - consider binary search
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return lookupMethod(s.methods, pkg, name)
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}
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func (s *TypeSet) String() string {
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if s.IsTop() {
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return "⊤"
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@ -44,27 +72,188 @@ func (s *TypeSet) String() string {
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return buf.String()
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}
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// IsTop reports whether type set s is the top type set (corresponding to the empty interface).
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func (s *TypeSet) IsTop() bool { return len(s.methods) == 0 && s.types == nil }
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// ----------------------------------------------------------------------------
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// Implementation
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// IsMethodSet reports whether the type set s is described by a single set of methods.
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func (s *TypeSet) IsMethodSet() bool { return s.types == nil && !s.IsComparable() }
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// topTypeSet may be used as type set for the empty interface.
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var topTypeSet TypeSet
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// IsComparable reports whether each type in the set is comparable.
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func (s *TypeSet) IsComparable() bool {
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_, m := s.LookupMethod(nil, "==")
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return m != nil
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// newTypeSet may be called with check == nil.
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func newTypeSet(check *Checker, pos token.Pos, ityp *Interface) *TypeSet {
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if ityp.tset != nil {
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return ityp.tset
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}
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// If the interface is not fully set up yet, the type set will
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// not be complete, which may lead to errors when using the the
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// type set (e.g. missing method). Don't compute a partial type
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// set (and don't store it!), so that we still compute the full
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// type set eventually. Instead, return the top type set and
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// let any follow-on errors play out.
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//
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// TODO(gri) Consider recording when this happens and reporting
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// it as an error (but only if there were no other errors so to
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// to not have unnecessary follow-on errors).
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if !ityp.complete {
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return &topTypeSet
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}
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if check != nil && trace {
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// Types don't generally have position information.
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// If we don't have a valid pos provided, try to use
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// one close enough.
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if !pos.IsValid() && len(ityp.methods) > 0 {
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pos = ityp.methods[0].pos
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}
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check.trace(pos, "type set for %s", ityp)
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check.indent++
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defer func() {
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check.indent--
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check.trace(pos, "=> %s ", ityp.typeSet())
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}()
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}
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// An infinitely expanding interface (due to a cycle) is detected
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// elsewhere (Checker.validType), so here we simply assume we only
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// have valid interfaces. Mark the interface as complete to avoid
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// infinite recursion if the validType check occurs later for some
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// reason.
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ityp.tset = new(TypeSet) // TODO(gri) is this sufficient?
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// Methods of embedded interfaces are collected unchanged; i.e., the identity
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// of a method I.m's Func Object of an interface I is the same as that of
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// the method m in an interface that embeds interface I. On the other hand,
|
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// if a method is embedded via multiple overlapping embedded interfaces, we
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// don't provide a guarantee which "original m" got chosen for the embedding
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// interface. See also issue #34421.
|
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//
|
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// If we don't care to provide this identity guarantee anymore, instead of
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// reusing the original method in embeddings, we can clone the method's Func
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// Object and give it the position of a corresponding embedded interface. Then
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// we can get rid of the mpos map below and simply use the cloned method's
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// position.
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var todo []*Func
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var seen objset
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var methods []*Func
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mpos := make(map[*Func]token.Pos) // method specification or method embedding position, for good error messages
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addMethod := func(pos token.Pos, m *Func, explicit bool) {
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switch other := seen.insert(m); {
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case other == nil:
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methods = append(methods, m)
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mpos[m] = pos
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case explicit:
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if check == nil {
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panic(fmt.Sprintf("%v: duplicate method %s", m.pos, m.name))
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}
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// check != nil
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check.errorf(atPos(pos), _DuplicateDecl, "duplicate method %s", m.name)
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check.errorf(atPos(mpos[other.(*Func)]), _DuplicateDecl, "\tother declaration of %s", m.name) // secondary error, \t indented
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default:
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// We have a duplicate method name in an embedded (not explicitly declared) method.
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// Check method signatures after all types are computed (issue #33656).
|
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// If we're pre-go1.14 (overlapping embeddings are not permitted), report that
|
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// error here as well (even though we could do it eagerly) because it's the same
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// error message.
|
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if check == nil {
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// check method signatures after all locally embedded interfaces are computed
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todo = append(todo, m, other.(*Func))
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break
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}
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// check != nil
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check.later(func() {
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if !check.allowVersion(m.pkg, 1, 14) || !Identical(m.typ, other.Type()) {
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check.errorf(atPos(pos), _DuplicateDecl, "duplicate method %s", m.name)
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check.errorf(atPos(mpos[other.(*Func)]), _DuplicateDecl, "\tother declaration of %s", m.name) // secondary error, \t indented
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}
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})
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}
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}
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for _, m := range ityp.methods {
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addMethod(m.pos, m, true)
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}
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// collect embedded elements
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var allTypes Type
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for i, typ := range ityp.embeddeds {
|
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// The embedding position is nil for imported interfaces
|
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// and also for interface copies after substitution (but
|
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// in that case we don't need to report errors again).
|
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var pos token.Pos // embedding position
|
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if ityp.embedPos != nil {
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pos = (*ityp.embedPos)[i]
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}
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var types Type
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switch t := under(typ).(type) {
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case *Interface:
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tset := newTypeSet(check, pos, t)
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for _, m := range tset.methods {
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addMethod(pos, m, false) // use embedding position pos rather than m.pos
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|
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}
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types = tset.types
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case *Union:
|
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// TODO(gri) combine with default case once we have
|
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// converted all tests to new notation and we
|
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// can report an error when we don't have an
|
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// interface before go1.18.
|
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types = typ
|
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case *TypeParam:
|
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if check != nil && !check.allowVersion(check.pkg, 1, 18) {
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check.errorf(atPos(pos), _InvalidIfaceEmbed, "%s is a type parameter, not an interface", typ)
|
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continue
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}
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types = typ
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default:
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if typ == Typ[Invalid] {
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continue
|
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}
|
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if check != nil && !check.allowVersion(check.pkg, 1, 18) {
|
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check.errorf(atPos(pos), _InvalidIfaceEmbed, "%s is not an interface", typ)
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continue
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}
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types = typ
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}
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allTypes = intersect(allTypes, types)
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}
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ityp.embedPos = nil // not needed anymore (errors have been reported)
|
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|
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// process todo's (this only happens if check == nil)
|
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for i := 0; i < len(todo); i += 2 {
|
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m := todo[i]
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other := todo[i+1]
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if !Identical(m.typ, other.typ) {
|
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panic(fmt.Sprintf("%v: duplicate method %s", m.pos, m.name))
|
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}
|
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}
|
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if methods != nil {
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sort.Sort(byUniqueMethodName(methods))
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ityp.tset.methods = methods
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}
|
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ityp.tset.types = allTypes
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|
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return ityp.tset
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}
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|
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// NumMethods returns the number of methods available.
|
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func (s *TypeSet) NumMethods() int { return len(s.methods) }
|
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|
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// Method returns the i'th method of type set s for 0 <= i < s.NumMethods().
|
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// The methods are ordered by their unique ID.
|
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func (s *TypeSet) Method(i int) *Func { return s.methods[i] }
|
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|
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// LookupMethod returns the index of and method with matching package and name, or (-1, nil).
|
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func (s *TypeSet) LookupMethod(pkg *Package, name string) (int, *Func) {
|
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// TODO(gri) s.methods is sorted - consider binary search
|
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return lookupMethod(s.methods, pkg, name)
|
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func sortMethods(list []*Func) {
|
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sort.Sort(byUniqueMethodName(list))
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}
|
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|
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func assertSortedMethods(list []*Func) {
|
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if !debug {
|
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panic("internal error: assertSortedMethods called outside debug mode")
|
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}
|
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if !sort.IsSorted(byUniqueMethodName(list)) {
|
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panic("internal error: methods not sorted")
|
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}
|
||||
}
|
||||
|
||||
// byUniqueMethodName method lists can be sorted by their unique method names.
|
||||
type byUniqueMethodName []*Func
|
||||
|
||||
func (a byUniqueMethodName) Len() int { return len(a) }
|
||||
func (a byUniqueMethodName) Less(i, j int) bool { return a[i].Id() < a[j].Id() }
|
||||
func (a byUniqueMethodName) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
|
||||
|
||||
Loading…
Reference in New Issue
Block a user