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// Copyright 2021 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 vulncheck
import (
"strings"
"golang.org/x/tools/go/ssa"
)
func entryPoints(topPackages []*ssa.Package) []*ssa.Function {
var entries []*ssa.Function
for _, pkg := range topPackages {
if pkg.Pkg.Name() == "main" {
// for "main" packages the only valid entry points are the "main"
// function and any "init#" functions, even if there are other
// exported functions or types. similarly to isEntry it should be
// safe to ignore the validity of the main or init# signatures,
// since the compiler will reject malformed definitions,
// and the init function is synthetic
entries = append(entries, memberFuncs(pkg.Members["main"], pkg.Prog)...)
for name, member := range pkg.Members {
if strings.HasPrefix(name, "init#") || name == "init" {
entries = append(entries, memberFuncs(member, pkg.Prog)...)
}
}
continue
}
for _, member := range pkg.Members {
for _, f := range memberFuncs(member, pkg.Prog) {
if isEntry(f) {
entries = append(entries, f)
}
}
}
}
return entries
}
func isEntry(f *ssa.Function) bool {
// it should be safe to ignore checking that the signature of the "init" function
// is valid, since it is synthetic
if f.Name() == "init" && f.Synthetic == "package initializer" {
return true
}
return f.Synthetic == "" && f.Object() != nil && f.Object().Exported()
}
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