mirror of
https://github.com/golang/go
synced 2024-10-01 05:38:32 -06:00
ced954c167
An identifier X in anonymous struct field struct{X} is both a
definition of a field (*Var) and reference to a type
(*TypeName). Now that we have split the map, we can capture
both of these aspects.
Interestingly, every client but one was going to extra effort
to iterate over just the uses or just the defs; this
simplifies them.
Also, fix two bug related to tagless switches:
- An entry was being recorded in the Object map for a piece of
synthetic syntax.
- The "true" identifier was being looked up in the current scope,
which allowed perverse users to locally redefine it. Now
we use the bool (not untyped boolean) constant true, per the
consequent clarification of the spec (issue 7404).
+ tests.
Fixes golang/go#7276
LGTM=gri
R=gri
CC=golang-codereviews
https://golang.org/cl/68270044
108 lines
2.7 KiB
Go
108 lines
2.7 KiB
Go
// Copyright 2013 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 oracle
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import (
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"fmt"
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"go/ast"
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"go/token"
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"sort"
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"code.google.com/p/go.tools/go/types"
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"code.google.com/p/go.tools/oracle/serial"
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)
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// Referrers reports all identifiers that resolve to the same object
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// as the queried identifier, within any package in the analysis scope.
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//
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func referrers(o *Oracle, qpos *QueryPos) (queryResult, error) {
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id, _ := qpos.path[0].(*ast.Ident)
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if id == nil {
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return nil, fmt.Errorf("no identifier here")
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}
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obj := qpos.info.ObjectOf(id)
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if obj == nil {
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// Happens for y in "switch y := x.(type)", but I think that's all.
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return nil, fmt.Errorf("no object for identifier")
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}
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// Iterate over all go/types' Uses facts for the entire program.
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var refs []*ast.Ident
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for _, info := range o.typeInfo {
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for id2, obj2 := range info.Uses {
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if sameObj(obj, obj2) {
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refs = append(refs, id2)
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}
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}
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}
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sort.Sort(byNamePos(refs))
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return &referrersResult{
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query: id,
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obj: obj,
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refs: refs,
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}, nil
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}
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// same reports whether x and y are identical, or both are PkgNames
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// referring to the same Package.
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//
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func sameObj(x, y types.Object) bool {
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if x == y {
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return true
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}
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if _, ok := x.(*types.PkgName); ok {
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if _, ok := y.(*types.PkgName); ok {
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return x.Pkg() == y.Pkg()
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}
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}
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return false
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}
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// -------- utils --------
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type byNamePos []*ast.Ident
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func (p byNamePos) Len() int { return len(p) }
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func (p byNamePos) Less(i, j int) bool { return p[i].NamePos < p[j].NamePos }
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func (p byNamePos) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
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type referrersResult struct {
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query *ast.Ident // identifer of query
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obj types.Object // object it denotes
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refs []*ast.Ident // set of all other references to it
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}
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func (r *referrersResult) display(printf printfFunc) {
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if r.query.Pos() != r.obj.Pos() {
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printf(r.query, "reference to %s", r.obj.Name())
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}
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// TODO(adonovan): pretty-print object using same logic as
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// (*describeValueResult).display.
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printf(r.obj, "defined here as %s", r.obj)
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for _, ref := range r.refs {
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if r.query != ref {
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printf(ref, "referenced here")
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}
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}
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}
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// TODO(adonovan): encode extent, not just Pos info, in Serial form.
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func (r *referrersResult) toSerial(res *serial.Result, fset *token.FileSet) {
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referrers := &serial.Referrers{
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Pos: fset.Position(r.query.Pos()).String(),
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Desc: r.obj.String(),
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}
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if pos := r.obj.Pos(); pos != token.NoPos { // Package objects have no Pos()
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referrers.ObjPos = fset.Position(pos).String()
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}
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for _, ref := range r.refs {
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referrers.Refs = append(referrers.Refs, fset.Position(ref.NamePos).String())
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}
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res.Referrers = referrers
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}
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