95 lines
2.5 KiB
Go
95 lines
2.5 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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"strings"
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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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)
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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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Some nodes may appear multiple times due to context-sensitive
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treatment of some calls.
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`)
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seen := make(map[call.GraphNode]int)
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var print func(cgn call.GraphNode, indent int)
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print = func(cgn call.GraphNode, indent int) {
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fn := cgn.Func()
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if num, ok := seen[cgn]; !ok {
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num = len(seen)
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seen[cgn] = num
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printf(fn, "%d\t%s%s", num, strings.Repeat(" ", indent), fn)
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// Don't use Edges(), which distinguishes callees by call site.
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for callee := range call.CalleesOf(cgn) {
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print(callee, indent+1)
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}
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} else {
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printf(fn, "\t%s%s (%d)", strings.Repeat(" ", indent), fn, 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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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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