mirror of
https://github.com/golang/go
synced 2024-11-19 00:44:40 -07:00
e08d89f3ed
+ Tests. + Emacs integration. + Emacs integration test. + very rudimentary Vim integration. Needs some love from a Vim user. TODO (in follow-ups): - More tests would be good. We'll need to make the output order deterministic in more places. - Documentation. R=gri, crawshaw, dominik.honnef CC=golang-dev https://golang.org/cl/9502043
74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
package oracle
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import (
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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 []callersCall
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o.config.Call = func(site pointer.CallSite, caller, callee pointer.CallGraphNode) {
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if callee.Func() == target {
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calls = append(calls, callersCall{site, caller})
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}
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}
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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 []callersCall
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}
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type callersCall struct {
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site pointer.CallSite
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caller pointer.CallGraphNode
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}
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func (r *callersResult) display(o *oracle) {
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if r.calls == nil {
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o.printf(r.target, "%s is not reachable in this program.", r.target)
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} else {
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o.printf(r.target, "%s is called from these %d sites:", r.target, len(r.calls))
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// TODO(adonovan): sort, to ensure test determinism.
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for _, call := range r.calls {
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if call.caller == r.root {
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o.printf(r.target, "the root of the call graph")
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} else {
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o.printf(call.site, "\t%s from %s",
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call.site.Description(), call.caller.Func())
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}
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}
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}
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}
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