103 lines
2.8 KiB
Go
103 lines
2.8 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"
|
|
"strings"
|
|
|
|
"code.google.com/p/go.tools/oracle/json"
|
|
"code.google.com/p/go.tools/pointer"
|
|
)
|
|
|
|
// callgraph displays the entire callgraph of the current program.
|
|
//
|
|
// Nodes may be seem to appear multiple times due to (limited)
|
|
// context sensitivity.
|
|
//
|
|
// TODO(adonovan): add options for restricting the display to a region
|
|
// of interest: function, package, subgraph, dirtree, goroutine, etc.
|
|
//
|
|
// TODO(adonovan): add an option to project away context sensitivity.
|
|
// The callgraph API should provide this feature.
|
|
//
|
|
// TODO(adonovan): elide nodes for synthetic functions?
|
|
//
|
|
func callgraph(o *oracle) (queryResult, error) {
|
|
buildSSA(o)
|
|
|
|
// Run the pointer analysis and build the complete callgraph.
|
|
callgraph := make(pointer.CallGraph)
|
|
o.config.Call = callgraph.AddEdge
|
|
root := ptrAnalysis(o)
|
|
|
|
// Assign (preorder) numbers to all the callgraph nodes.
|
|
// TODO(adonovan): the callgraph API should do this for us.
|
|
numbering := make(map[pointer.CallGraphNode]int)
|
|
var number func(cgn pointer.CallGraphNode)
|
|
number = func(cgn pointer.CallGraphNode) {
|
|
if _, ok := numbering[cgn]; !ok {
|
|
numbering[cgn] = len(numbering)
|
|
for callee := range callgraph[cgn] {
|
|
number(callee)
|
|
}
|
|
}
|
|
}
|
|
number(root)
|
|
|
|
return &callgraphResult{
|
|
root: root,
|
|
callgraph: callgraph,
|
|
numbering: numbering,
|
|
}, nil
|
|
}
|
|
|
|
type callgraphResult struct {
|
|
root pointer.CallGraphNode
|
|
callgraph pointer.CallGraph
|
|
numbering map[pointer.CallGraphNode]int
|
|
}
|
|
|
|
func (r *callgraphResult) display(printf printfFunc) {
|
|
printf(nil, `
|
|
Below is a call graph of the entire program.
|
|
The numbered nodes form a spanning tree.
|
|
Non-numbered nodes indicate back- or cross-edges to the node whose
|
|
number follows in parentheses.
|
|
Some nodes may appear multiple times due to context-sensitive
|
|
treatment of some calls.
|
|
`)
|
|
|
|
seen := make(map[pointer.CallGraphNode]bool)
|
|
var print func(cgn pointer.CallGraphNode, indent int)
|
|
print = func(cgn pointer.CallGraphNode, indent int) {
|
|
n := r.numbering[cgn]
|
|
if !seen[cgn] {
|
|
seen[cgn] = true
|
|
printf(cgn.Func(), "%d\t%s%s", n, strings.Repeat(" ", indent), cgn.Func())
|
|
for callee := range r.callgraph[cgn] {
|
|
print(callee, indent+1)
|
|
}
|
|
} else {
|
|
printf(cgn.Func(), "\t%s%s (%d)", strings.Repeat(" ", indent), cgn.Func(), n)
|
|
}
|
|
}
|
|
print(r.root, 0)
|
|
}
|
|
|
|
func (r *callgraphResult) toJSON(res *json.Result, fset *token.FileSet) {
|
|
cg := make([]json.CallGraph, len(r.numbering))
|
|
for n, i := range r.numbering {
|
|
j := &cg[i]
|
|
fn := n.Func()
|
|
j.Name = fn.String()
|
|
j.Pos = fset.Position(fn.Pos()).String()
|
|
for callee := range r.callgraph[n] {
|
|
j.Children = append(j.Children, r.numbering[callee])
|
|
}
|
|
}
|
|
res.Callgraph = cg
|
|
}
|