95 lines
2.6 KiB
Go
95 lines
2.6 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/go/callgraph"
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"code.google.com/p/go.tools/go/ssa"
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"code.google.com/p/go.tools/oracle/serial"
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)
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// doCallgraph displays the entire callgraph of the current program.
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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 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 doCallgraph(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.ptaConfig.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 *callgraph.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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printed := make(map[*callgraph.Node]int)
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var print func(caller *callgraph.Node, indent int)
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print = func(caller *callgraph.Node, 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 callgraph.CalleesOf(caller) {
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funcs = append(funcs, callee.Func)
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}
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sort.Sort(funcs)
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printf(caller.Func, "%d\t%*s%s", num, 4*indent, "", caller.Func)
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for _, callee := range funcs {
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print(r.callgraph.Nodes[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.Func, num)
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}
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}
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print(r.callgraph.Root, 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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cg := make([]serial.CallGraph, len(r.callgraph.Nodes))
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for _, n := range r.callgraph.Nodes {
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j := &cg[n.ID]
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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 callgraph.CalleesOf(n) {
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j.Children = append(j.Children, callee.ID)
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}
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sort.Ints(j.Children)
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}
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res.Callgraph = cg
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}
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