mirror of
https://github.com/golang/go
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133 lines
3.5 KiB
Go
133 lines
3.5 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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"sort"
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"code.google.com/p/go.tools/call"
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"code.google.com/p/go.tools/oracle/serial"
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"code.google.com/p/go.tools/ssa"
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)
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// callgraph displays the entire callgraph of the current program.
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//
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// Nodes may be seem to appear multiple times due to (limited)
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// context sensitivity.
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//
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// TODO(adonovan): add options for restricting the display to a region
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// of interest: function, package, subgraph, dirtree, goroutine, etc.
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//
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// TODO(adonovan): add an option to project away context sensitivity.
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// The callgraph API should provide this feature.
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//
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// TODO(adonovan): add an option to partition edges by call site.
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//
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// TODO(adonovan): elide nodes for synthetic functions?
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//
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func callgraph(o *Oracle, _ *QueryPos) (queryResult, error) {
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buildSSA(o)
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// Run the pointer analysis and build the complete callgraph.
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o.config.BuildCallGraph = true
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ptares := ptrAnalysis(o)
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return &callgraphResult{
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callgraph: ptares.CallGraph,
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}, nil
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}
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type callgraphResult struct {
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callgraph call.Graph
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}
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func (r *callgraphResult) display(printf printfFunc) {
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printf(nil, `
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Below is a call graph of the entire program.
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The numbered nodes form a spanning tree.
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Non-numbered nodes indicate back- or cross-edges to the node whose
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number follows in parentheses.
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`)
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root := r.callgraph.Root()
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// context-insensitive (CI) call graph.
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ci := make(map[*ssa.Function]map[*ssa.Function]bool)
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// 1. Visit the CS call graph and build the CI call graph.
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visited := make(map[call.GraphNode]bool)
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var visit func(caller call.GraphNode)
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visit = func(caller call.GraphNode) {
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if !visited[caller] {
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visited[caller] = true
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cicallees := ci[caller.Func()]
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if cicallees == nil {
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cicallees = make(map[*ssa.Function]bool)
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ci[caller.Func()] = cicallees
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}
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for _, e := range caller.Edges() {
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cicallees[e.Callee.Func()] = true
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visit(e.Callee)
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}
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}
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}
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visit(root)
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// 2. Print the CI callgraph.
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printed := make(map[*ssa.Function]int)
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var print func(caller *ssa.Function, indent int)
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print = func(caller *ssa.Function, indent int) {
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if num, ok := printed[caller]; !ok {
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num = len(printed)
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printed[caller] = num
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// Sort the children into name order for deterministic* output.
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// (*mostly: anon funcs' names are not globally unique.)
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var funcs funcsByName
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for callee := range ci[caller] {
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funcs = append(funcs, callee)
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}
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sort.Sort(funcs)
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printf(caller, "%d\t%*s%s", num, 4*indent, "", caller)
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for _, callee := range funcs {
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print(callee, indent+1)
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}
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} else {
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printf(caller, "\t%*s%s (%d)", 4*indent, "", caller, num)
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}
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}
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print(root.Func(), 0)
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}
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type funcsByName []*ssa.Function
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func (s funcsByName) Len() int { return len(s) }
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func (s funcsByName) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
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func (s funcsByName) Less(i, j int) bool { return s[i].String() < s[j].String() }
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func (r *callgraphResult) toSerial(res *serial.Result, fset *token.FileSet) {
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nodes := r.callgraph.Nodes()
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numbering := make(map[call.GraphNode]int)
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for i, n := range nodes {
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numbering[n] = i
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}
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cg := make([]serial.CallGraph, len(nodes))
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for i, n := range nodes {
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j := &cg[i]
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fn := n.Func()
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j.Name = fn.String()
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j.Pos = fset.Position(fn.Pos()).String()
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for callee := range call.CalleesOf(n) {
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j.Children = append(j.Children, numbering[callee])
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}
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}
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res.Callgraph = cg
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}
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