mirror of
https://github.com/golang/go
synced 2024-11-26 04:07:59 -07:00
[dev.typeparams] go/types: move interface checking into separate file
This is a port of CL 321549 to go/types. Specifically, the same checker methods were moved. Change-Id: I491a8c5a985d71ebb23e4b34541a557da0af0cfc Reviewed-on: https://go-review.googlesource.com/c/go/+/324752 Trust: Robert Findley <rfindley@google.com> Run-TryBot: Robert Findley <rfindley@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Rob Findley
Robert Findley
parent
090a17c998
commit
ffc74ad5d3
321
src/go/types/interface.go
Normal file
321
src/go/types/interface.go
Normal file
@ -0,0 +1,321 @@
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// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package types
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import (
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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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var tlist *ast.Ident // "type" name of first entry in a type list declaration
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var types []ast.Expr
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for _, f := range iface.Methods.List {
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if len(f.Names) > 0 {
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// We have a method with name f.Names[0], or a type
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// of a type list (name.Name == "type").
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// (The parser ensures that there's only one method
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// and we don't care if a constructed AST has more.)
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name := f.Names[0]
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if name.Name == "_" {
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check.errorf(name, _BlankIfaceMethod, "invalid method name _")
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continue // ignore
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}
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if name.Name == "type" {
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// Always collect all type list entries, even from
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// different type lists, under the assumption that
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// the author intended to include all types.
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types = append(types, f.Type)
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if tlist != nil && tlist != name {
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check.errorf(name, _Todo, "cannot have multiple type lists in an interface")
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}
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tlist = name
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continue
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}
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typ := check.typ(f.Type)
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sig, _ := typ.(*Signature)
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if sig == nil {
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if typ != Typ[Invalid] {
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check.invalidAST(f.Type, "%s is not a method signature", typ)
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}
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continue // ignore
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}
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// Always type-check method type parameters but complain if they are not enabled.
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// (This extra check is needed here because interface method signatures don't have
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// a receiver specification.)
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if sig.tparams != nil {
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var at positioner = f.Type
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if tparams := typeparams.Get(f.Type); tparams != nil {
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at = tparams
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}
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check.errorf(at, _Todo, "methods cannot have type parameters")
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}
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// use named receiver type if available (for better error messages)
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var recvTyp Type = ityp
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if def != nil {
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recvTyp = def
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}
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sig.recv = NewVar(name.Pos(), check.pkg, "", recvTyp)
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m := NewFunc(name.Pos(), check.pkg, name.Name, sig)
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check.recordDef(name, m)
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ityp.methods = append(ityp.methods, m)
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} else {
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// We have an embedded type. completeInterface will
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// eventually verify that we have an interface.
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ityp.embeddeds = append(ityp.embeddeds, check.typ(f.Type))
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check.posMap[ityp] = append(check.posMap[ityp], f.Type.Pos())
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}
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}
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// type constraints
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ityp.types = _NewSum(check.collectTypeConstraints(iface.Pos(), types))
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if len(ityp.methods) == 0 && ityp.types == nil && len(ityp.embeddeds) == 0 {
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// empty interface
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ityp.allMethods = markComplete
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return
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}
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// sort for API stability
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sortMethods(ityp.methods)
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sortTypes(ityp.embeddeds)
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check.later(func() { check.completeInterface(iface.Pos(), ityp) })
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}
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func (check *Checker) collectTypeConstraints(pos token.Pos, types []ast.Expr) []Type {
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list := make([]Type, 0, len(types)) // assume all types are correct
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for _, texpr := range types {
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if texpr == nil {
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check.invalidAST(atPos(pos), "missing type constraint")
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continue
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}
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list = append(list, check.varType(texpr))
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}
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// Ensure that each type is only present once in the type list. Types may be
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// interfaces, which may not be complete yet. It's ok to do this check at the
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// end because it's not a requirement for correctness of the code.
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// Note: This is a quadratic algorithm, but type lists tend to be short.
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check.later(func() {
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for i, t := range list {
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if t := asInterface(t); t != nil {
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check.completeInterface(types[i].Pos(), t)
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}
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if includes(list[:i], t) {
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check.softErrorf(types[i], _Todo, "duplicate type %s in type list", t)
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}
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}
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})
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return list
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}
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// includes reports whether typ is in list.
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func includes(list []Type, typ Type) bool {
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for _, e := range list {
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if Identical(typ, e) {
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return true
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}
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}
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return false
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}
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func (check *Checker) completeInterface(pos token.Pos, ityp *Interface) {
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if ityp.allMethods != nil {
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return
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}
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// completeInterface may be called via the LookupFieldOrMethod,
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// MissingMethod, Identical, or IdenticalIgnoreTags external API
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// in which case check will be nil. In this case, type-checking
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// must be finished and all interfaces should have been completed.
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if check == nil {
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panic("internal error: incomplete interface")
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}
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if 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, "complete %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 (methods = %v, types = %v)", ityp, ityp.allMethods, ityp.allTypes)
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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.allMethods = markComplete
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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 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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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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check.later(func() {
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if !check.allowVersion(m.pkg, 1, 14) || !check.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 types
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allTypes := ityp.types
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posList := check.posMap[ityp]
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for i, typ := range ityp.embeddeds {
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pos := posList[i] // embedding position
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utyp := under(typ)
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etyp := asInterface(utyp)
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if etyp == nil {
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if utyp != Typ[Invalid] {
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var format string
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if _, ok := utyp.(*_TypeParam); ok {
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format = "%s is a type parameter, not an interface"
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} else {
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format = "%s is not an interface"
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}
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// TODO: correct error code.
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check.errorf(atPos(pos), _InvalidIfaceEmbed, format, typ)
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}
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continue
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}
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check.completeInterface(pos, etyp)
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for _, m := range etyp.allMethods {
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addMethod(pos, m, false) // use embedding position pos rather than m.pos
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}
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allTypes = intersect(allTypes, etyp.allTypes)
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}
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if methods != nil {
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sort.Sort(byUniqueMethodName(methods))
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ityp.allMethods = methods
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}
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ityp.allTypes = allTypes
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}
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// intersect computes the intersection of the types x and y.
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// Note: A incomming nil type stands for the top type. A top
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// type result is returned as nil.
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func intersect(x, y Type) (r Type) {
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defer func() {
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if r == theTop {
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r = nil
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}
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}()
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switch {
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case x == theBottom || y == theBottom:
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return theBottom
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case x == nil || x == theTop:
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return y
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case y == nil || x == theTop:
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return x
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}
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xtypes := unpackType(x)
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ytypes := unpackType(y)
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// Compute the list rtypes which includes only
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// types that are in both xtypes and ytypes.
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// Quadratic algorithm, but good enough for now.
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// TODO(gri) fix this
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var rtypes []Type
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for _, x := range xtypes {
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if includes(ytypes, x) {
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rtypes = append(rtypes, x)
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}
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}
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if rtypes == nil {
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return theBottom
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}
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return _NewSum(rtypes)
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}
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func sortTypes(list []Type) {
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sort.Stable(byUniqueTypeName(list))
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}
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// byUniqueTypeName named type lists can be sorted by their unique type names.
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type byUniqueTypeName []Type
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func (a byUniqueTypeName) Len() int { return len(a) }
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func (a byUniqueTypeName) Less(i, j int) bool { return sortName(a[i]) < sortName(a[j]) }
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func (a byUniqueTypeName) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
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func sortName(t Type) string {
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if named := asNamed(t); named != nil {
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return named.obj.Id()
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}
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return ""
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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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@ -12,7 +12,6 @@ import (
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"go/constant"
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"go/internal/typeparams"
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"go/token"
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"sort"
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"strconv"
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"strings"
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)
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@ -758,277 +757,6 @@ func (check *Checker) declareInSet(oset *objset, pos token.Pos, obj Object) bool
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return true
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}
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func (check *Checker) interfaceType(ityp *Interface, iface *ast.InterfaceType, def *Named) {
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var tlist *ast.Ident // "type" name of first entry in a type list declaration
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var types []ast.Expr
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for _, f := range iface.Methods.List {
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if len(f.Names) > 0 {
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// We have a method with name f.Names[0], or a type
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// of a type list (name.Name == "type").
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// (The parser ensures that there's only one method
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// and we don't care if a constructed AST has more.)
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name := f.Names[0]
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if name.Name == "_" {
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check.errorf(name, _BlankIfaceMethod, "invalid method name _")
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continue // ignore
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}
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if name.Name == "type" {
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// Always collect all type list entries, even from
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// different type lists, under the assumption that
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// the author intended to include all types.
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types = append(types, f.Type)
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if tlist != nil && tlist != name {
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check.errorf(name, _Todo, "cannot have multiple type lists in an interface")
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}
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tlist = name
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continue
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}
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typ := check.typ(f.Type)
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sig, _ := typ.(*Signature)
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if sig == nil {
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if typ != Typ[Invalid] {
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check.invalidAST(f.Type, "%s is not a method signature", typ)
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}
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continue // ignore
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}
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// Always type-check method type parameters but complain if they are not enabled.
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// (This extra check is needed here because interface method signatures don't have
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// a receiver specification.)
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if sig.tparams != nil {
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var at positioner = f.Type
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if tparams := typeparams.Get(f.Type); tparams != nil {
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at = tparams
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}
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check.errorf(at, _Todo, "methods cannot have type parameters")
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}
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// use named receiver type if available (for better error messages)
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var recvTyp Type = ityp
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if def != nil {
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recvTyp = def
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}
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sig.recv = NewVar(name.Pos(), check.pkg, "", recvTyp)
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m := NewFunc(name.Pos(), check.pkg, name.Name, sig)
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check.recordDef(name, m)
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ityp.methods = append(ityp.methods, m)
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} else {
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// We have an embedded type. completeInterface will
|
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// eventually verify that we have an interface.
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ityp.embeddeds = append(ityp.embeddeds, check.typ(f.Type))
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check.posMap[ityp] = append(check.posMap[ityp], f.Type.Pos())
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}
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}
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// type constraints
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ityp.types = _NewSum(check.collectTypeConstraints(iface.Pos(), types))
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|
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if len(ityp.methods) == 0 && ityp.types == nil && len(ityp.embeddeds) == 0 {
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// empty interface
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ityp.allMethods = markComplete
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return
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}
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// sort for API stability
|
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sortMethods(ityp.methods)
|
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sortTypes(ityp.embeddeds)
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check.later(func() { check.completeInterface(iface.Pos(), ityp) })
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}
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|
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func (check *Checker) completeInterface(pos token.Pos, ityp *Interface) {
|
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if ityp.allMethods != nil {
|
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return
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}
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|
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// completeInterface may be called via the LookupFieldOrMethod,
|
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// MissingMethod, Identical, or IdenticalIgnoreTags external API
|
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// in which case check will be nil. In this case, type-checking
|
||||
// must be finished and all interfaces should have been completed.
|
||||
if check == nil {
|
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panic("internal error: incomplete interface")
|
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}
|
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|
||||
if 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, "complete %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 (methods = %v, types = %v)", ityp, ityp.allMethods, ityp.allTypes)
|
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}()
|
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}
|
||||
|
||||
// An infinitely expanding interface (due to a cycle) is detected
|
||||
// elsewhere (Checker.validType), so here we simply assume we only
|
||||
// have valid interfaces. Mark the interface as complete to avoid
|
||||
// infinite recursion if the validType check occurs later for some
|
||||
// reason.
|
||||
ityp.allMethods = markComplete
|
||||
|
||||
// Methods of embedded interfaces are collected unchanged; i.e., the identity
|
||||
// of a method I.m's Func Object of an interface I is the same as that of
|
||||
// the method m in an interface that embeds interface I. On the other hand,
|
||||
// if a method is embedded via multiple overlapping embedded interfaces, we
|
||||
// don't provide a guarantee which "original m" got chosen for the embedding
|
||||
// interface. See also issue #34421.
|
||||
//
|
||||
// If we don't care to provide this identity guarantee anymore, instead of
|
||||
// reusing the original method in embeddings, we can clone the method's Func
|
||||
// Object and give it the position of a corresponding embedded interface. Then
|
||||
// we can get rid of the mpos map below and simply use the cloned method's
|
||||
// position.
|
||||
|
||||
var seen objset
|
||||
var methods []*Func
|
||||
mpos := make(map[*Func]token.Pos) // method specification or method embedding position, for good error messages
|
||||
addMethod := func(pos token.Pos, m *Func, explicit bool) {
|
||||
switch other := seen.insert(m); {
|
||||
case other == nil:
|
||||
methods = append(methods, m)
|
||||
mpos[m] = pos
|
||||
case explicit:
|
||||
check.errorf(atPos(pos), _DuplicateDecl, "duplicate method %s", m.name)
|
||||
check.errorf(atPos(mpos[other.(*Func)]), _DuplicateDecl, "\tother declaration of %s", m.name) // secondary error, \t indented
|
||||
default:
|
||||
// We have a duplicate method name in an embedded (not explicitly declared) method.
|
||||
// Check method signatures after all types are computed (issue #33656).
|
||||
// If we're pre-go1.14 (overlapping embeddings are not permitted), report that
|
||||
// error here as well (even though we could do it eagerly) because it's the same
|
||||
// error message.
|
||||
check.later(func() {
|
||||
if !check.allowVersion(m.pkg, 1, 14) || !check.identical(m.typ, other.Type()) {
|
||||
check.errorf(atPos(pos), _DuplicateDecl, "duplicate method %s", m.name)
|
||||
check.errorf(atPos(mpos[other.(*Func)]), _DuplicateDecl, "\tother declaration of %s", m.name) // secondary error, \t indented
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
for _, m := range ityp.methods {
|
||||
addMethod(m.pos, m, true)
|
||||
}
|
||||
|
||||
// collect types
|
||||
allTypes := ityp.types
|
||||
|
||||
posList := check.posMap[ityp]
|
||||
for i, typ := range ityp.embeddeds {
|
||||
pos := posList[i] // embedding position
|
||||
utyp := under(typ)
|
||||
etyp := asInterface(utyp)
|
||||
if etyp == nil {
|
||||
if utyp != Typ[Invalid] {
|
||||
var format string
|
||||
if _, ok := utyp.(*_TypeParam); ok {
|
||||
format = "%s is a type parameter, not an interface"
|
||||
} else {
|
||||
format = "%s is not an interface"
|
||||
}
|
||||
// TODO: correct error code.
|
||||
check.errorf(atPos(pos), _InvalidIfaceEmbed, format, typ)
|
||||
}
|
||||
continue
|
||||
}
|
||||
check.completeInterface(pos, etyp)
|
||||
for _, m := range etyp.allMethods {
|
||||
addMethod(pos, m, false) // use embedding position pos rather than m.pos
|
||||
}
|
||||
allTypes = intersect(allTypes, etyp.allTypes)
|
||||
}
|
||||
|
||||
if methods != nil {
|
||||
sort.Sort(byUniqueMethodName(methods))
|
||||
ityp.allMethods = methods
|
||||
}
|
||||
ityp.allTypes = allTypes
|
||||
}
|
||||
|
||||
// intersect computes the intersection of the types x and y.
|
||||
// Note: A incomming nil type stands for the top type. A top
|
||||
// type result is returned as nil.
|
||||
func intersect(x, y Type) (r Type) {
|
||||
defer func() {
|
||||
if r == theTop {
|
||||
r = nil
|
||||
}
|
||||
}()
|
||||
|
||||
switch {
|
||||
case x == theBottom || y == theBottom:
|
||||
return theBottom
|
||||
case x == nil || x == theTop:
|
||||
return y
|
||||
case y == nil || x == theTop:
|
||||
return x
|
||||
}
|
||||
|
||||
xtypes := unpackType(x)
|
||||
ytypes := unpackType(y)
|
||||
// Compute the list rtypes which includes only
|
||||
// types that are in both xtypes and ytypes.
|
||||
// Quadratic algorithm, but good enough for now.
|
||||
// TODO(gri) fix this
|
||||
var rtypes []Type
|
||||
for _, x := range xtypes {
|
||||
if includes(ytypes, x) {
|
||||
rtypes = append(rtypes, x)
|
||||
}
|
||||
}
|
||||
|
||||
if rtypes == nil {
|
||||
return theBottom
|
||||
}
|
||||
return _NewSum(rtypes)
|
||||
}
|
||||
|
||||
func sortTypes(list []Type) {
|
||||
sort.Stable(byUniqueTypeName(list))
|
||||
}
|
||||
|
||||
// byUniqueTypeName named type lists can be sorted by their unique type names.
|
||||
type byUniqueTypeName []Type
|
||||
|
||||
func (a byUniqueTypeName) Len() int { return len(a) }
|
||||
func (a byUniqueTypeName) Less(i, j int) bool { return sortName(a[i]) < sortName(a[j]) }
|
||||
func (a byUniqueTypeName) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
|
||||
|
||||
func sortName(t Type) string {
|
||||
if named := asNamed(t); named != nil {
|
||||
return named.obj.Id()
|
||||
}
|
||||
return ""
|
||||
}
|
||||
|
||||
func sortMethods(list []*Func) {
|
||||
sort.Sort(byUniqueMethodName(list))
|
||||
}
|
||||
|
||||
func assertSortedMethods(list []*Func) {
|
||||
if !debug {
|
||||
panic("internal error: assertSortedMethods called outside debug mode")
|
||||
}
|
||||
if !sort.IsSorted(byUniqueMethodName(list)) {
|
||||
panic("internal error: methods not sorted")
|
||||
}
|
||||
}
|
||||
|
||||
// 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] }
|
||||
|
||||
func (check *Checker) tag(t *ast.BasicLit) string {
|
||||
if t != nil {
|
||||
if t.Kind == token.STRING {
|
||||
@ -1162,41 +890,3 @@ func embeddedFieldIdent(e ast.Expr) *ast.Ident {
|
||||
}
|
||||
return nil // invalid embedded field
|
||||
}
|
||||
|
||||
func (check *Checker) collectTypeConstraints(pos token.Pos, types []ast.Expr) []Type {
|
||||
list := make([]Type, 0, len(types)) // assume all types are correct
|
||||
for _, texpr := range types {
|
||||
if texpr == nil {
|
||||
check.invalidAST(atPos(pos), "missing type constraint")
|
||||
continue
|
||||
}
|
||||
list = append(list, check.varType(texpr))
|
||||
}
|
||||
|
||||
// Ensure that each type is only present once in the type list. Types may be
|
||||
// interfaces, which may not be complete yet. It's ok to do this check at the
|
||||
// end because it's not a requirement for correctness of the code.
|
||||
// Note: This is a quadratic algorithm, but type lists tend to be short.
|
||||
check.later(func() {
|
||||
for i, t := range list {
|
||||
if t := asInterface(t); t != nil {
|
||||
check.completeInterface(types[i].Pos(), t)
|
||||
}
|
||||
if includes(list[:i], t) {
|
||||
check.softErrorf(types[i], _Todo, "duplicate type %s in type list", t)
|
||||
}
|
||||
}
|
||||
})
|
||||
|
||||
return list
|
||||
}
|
||||
|
||||
// includes reports whether typ is in list.
|
||||
func includes(list []Type, typ Type) bool {
|
||||
for _, e := range list {
|
||||
if Identical(typ, e) {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user