mirror of
https://github.com/golang/go
synced 2024-11-19 02:14:43 -07:00
37f76edde8
This CL is mostly a renaming s/json/serial/, abstracting the oracle package away from any particular data syntax. (The encoding/* machinery is very clean; clearly I should have structured it this way from the outset.) Supporting XML then becomes a one-liner in cmd/oracle/main.go. Also: call MarshalIndent(), not Marshall() then Indent(). R=crawshaw CC=golang-dev https://golang.org/cl/13858046
116 lines
3.0 KiB
Go
116 lines
3.0 KiB
Go
// Copyright 2013 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package oracle
|
|
|
|
import (
|
|
"go/token"
|
|
|
|
"code.google.com/p/go.tools/oracle/serial"
|
|
"code.google.com/p/go.tools/pointer"
|
|
"code.google.com/p/go.tools/ssa"
|
|
)
|
|
|
|
// Callstack displays an arbitrary path from a root of the callgraph
|
|
// to the function at the current position.
|
|
//
|
|
// The information may be misleading in a context-insensitive
|
|
// analysis. e.g. the call path X->Y->Z might be infeasible if Y never
|
|
// calls Z when it is called from X. TODO(adonovan): think about UI.
|
|
//
|
|
// TODO(adonovan): permit user to specify a starting point other than
|
|
// the analysis root.
|
|
//
|
|
func callstack(o *Oracle, qpos *QueryPos) (queryResult, error) {
|
|
pkg := o.prog.Package(qpos.info.Pkg)
|
|
if pkg == nil {
|
|
return nil, o.errorf(qpos.path[0], "no SSA package")
|
|
}
|
|
|
|
if !ssa.HasEnclosingFunction(pkg, qpos.path) {
|
|
return nil, o.errorf(qpos.path[0], "this position is not inside a function")
|
|
}
|
|
|
|
buildSSA(o)
|
|
|
|
target := ssa.EnclosingFunction(pkg, qpos.path)
|
|
if target == nil {
|
|
return nil, o.errorf(qpos.path[0],
|
|
"no SSA function built for this location (dead code?)")
|
|
}
|
|
|
|
// Run the pointer analysis and build the complete call graph.
|
|
callgraph := make(pointer.CallGraph)
|
|
o.config.Call = callgraph.AddEdge
|
|
root := ptrAnalysis(o)
|
|
|
|
seen := make(map[pointer.CallGraphNode]bool)
|
|
var callstack []pointer.CallSite
|
|
|
|
// Use depth-first search to find an arbitrary path from a
|
|
// root to the target function.
|
|
var search func(cgn pointer.CallGraphNode) bool
|
|
search = func(cgn pointer.CallGraphNode) bool {
|
|
if !seen[cgn] {
|
|
seen[cgn] = true
|
|
if cgn.Func() == target {
|
|
return true
|
|
}
|
|
for callee, site := range callgraph[cgn] {
|
|
if search(callee) {
|
|
callstack = append(callstack, site)
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
for toplevel := range callgraph[root] {
|
|
if search(toplevel) {
|
|
break
|
|
}
|
|
}
|
|
|
|
return &callstackResult{
|
|
qpos: qpos,
|
|
target: target,
|
|
callstack: callstack,
|
|
}, nil
|
|
}
|
|
|
|
type callstackResult struct {
|
|
qpos *QueryPos
|
|
target *ssa.Function
|
|
callstack []pointer.CallSite
|
|
}
|
|
|
|
func (r *callstackResult) display(printf printfFunc) {
|
|
if r.callstack != nil {
|
|
printf(r.qpos, "Found a call path from root to %s", r.target)
|
|
printf(r.target, "%s", r.target)
|
|
for _, site := range r.callstack {
|
|
printf(site, "%s from %s", site.Description(), site.Caller().Func())
|
|
}
|
|
} else {
|
|
printf(r.target, "%s is unreachable in this analysis scope", r.target)
|
|
}
|
|
}
|
|
|
|
func (r *callstackResult) toSerial(res *serial.Result, fset *token.FileSet) {
|
|
var callers []serial.Caller
|
|
for _, site := range r.callstack {
|
|
callers = append(callers, serial.Caller{
|
|
Pos: fset.Position(site.Pos()).String(),
|
|
Caller: site.Caller().Func().String(),
|
|
Desc: site.Description(),
|
|
})
|
|
}
|
|
res.Callstack = &serial.CallStack{
|
|
Pos: fset.Position(r.target.Pos()).String(),
|
|
Target: r.target.String(),
|
|
Callers: callers,
|
|
}
|
|
}
|