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// Copyright 2014 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 static computes the call graph of a Go program containing
// only static call edges.
package static // import "golang.org/x/tools/go/callgraph/static"
// TODO(zpavlinovic): update static for how it handles generic function bodies.
import (
"golang.org/x/tools/go/callgraph"
"golang.org/x/tools/go/ssa"
"golang.org/x/tools/go/ssa/ssautil"
)
// CallGraph computes the call graph of the specified program
// considering only static calls.
func CallGraph(prog *ssa.Program) *callgraph.Graph {
cg := callgraph.New(nil) // TODO(adonovan) eliminate concept of rooted callgraph
// TODO(adonovan): opt: use only a single pass over the ssa.Program.
// TODO(adonovan): opt: this is slower than RTA (perhaps because
// the lower precision means so many edges are allocated)!
for f := range ssautil.AllFunctions(prog) {
fnode := cg.CreateNode(f)
for _, b := range f.Blocks {
for _, instr := range b.Instrs {
if site, ok := instr.(ssa.CallInstruction); ok {
if g := site.Common().StaticCallee(); g != nil {
gnode := cg.CreateNode(g)
callgraph.AddEdge(fnode, site, gnode)
}
}
}
}
}
return cg
}
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