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https://github.com/golang/go
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0725e5a5b3
+ test. Also: - provide non-nil map to Importer.doImport0() to avoid a crash. - reorganize oracle "needs" bits. - reduce "needs" of 'freevars' and 'implements' queries by avoiding ssa.Packages when types.Package suffices. R=crawshaw CC=golang-dev https://golang.org/cl/13421046
91 lines
2.3 KiB
Go
91 lines
2.3 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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"go/token"
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"code.google.com/p/go.tools/oracle/json"
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"code.google.com/p/go.tools/pointer"
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"code.google.com/p/go.tools/ssa"
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)
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// Callers reports the possible callers of the function
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// immediately enclosing the specified source location.
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//
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// TODO(adonovan): if a caller is a wrapper, show the caller's caller.
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//
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func callers(o *oracle) (queryResult, error) {
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pkg := o.prog.Package(o.queryPkgInfo.Pkg)
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if pkg == nil {
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return nil, o.errorf(o.queryPath[0], "no SSA package")
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}
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if !ssa.HasEnclosingFunction(pkg, o.queryPath) {
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return nil, o.errorf(o.queryPath[0], "this position is not inside a function")
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}
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buildSSA(o)
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target := ssa.EnclosingFunction(pkg, o.queryPath)
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if target == nil {
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return nil, o.errorf(o.queryPath[0], "no SSA function built for this location (dead code?)")
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}
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// Run the pointer analysis, recording each
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// call found to originate from target.
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var calls []pointer.CallSite
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o.config.Call = func(site pointer.CallSite, callee pointer.CallGraphNode) {
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if callee.Func() == target {
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calls = append(calls, site)
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}
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}
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// TODO(adonovan): sort calls, to ensure test determinism.
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root := ptrAnalysis(o)
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return &callersResult{
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target: target,
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root: root,
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calls: calls,
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}, nil
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}
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type callersResult struct {
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target *ssa.Function
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root pointer.CallGraphNode
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calls []pointer.CallSite
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}
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func (r *callersResult) display(printf printfFunc) {
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if r.calls == nil {
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printf(r.target, "%s is not reachable in this program.", r.target)
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} else {
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printf(r.target, "%s is called from these %d sites:", r.target, len(r.calls))
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for _, site := range r.calls {
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if site.Caller() == r.root {
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printf(r.target, "the root of the call graph")
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} else {
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printf(site, "\t%s from %s", site.Description(), site.Caller().Func())
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}
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}
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}
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}
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func (r *callersResult) toJSON(res *json.Result, fset *token.FileSet) {
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var callers []json.Caller
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for _, site := range r.calls {
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var c json.Caller
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c.Caller = site.Caller().Func().String()
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if site.Caller() == r.root {
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c.Desc = "synthetic call"
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} else {
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c.Pos = fset.Position(site.Pos()).String()
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c.Desc = site.Description()
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}
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callers = append(callers, c)
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}
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res.Callers = callers
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}
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