// mainPackage returns the main package to analyze.
// The resulting package has a main() function.
func mainPackage(prog *ssa.Program, tests bool) (*ssa.Package, error) {
pkgs := prog.AllPackages()
// TODO(adonovan): allow independent control over tests, mains and libraries.
// TODO(adonovan): put this logic in a library; we keep reinventing it.
if tests {
// If -test, use all packages' tests.
if len(pkgs) > 0 {
if main := prog.CreateTestMainPackage(pkgs...); main != nil {
return main, nil
}
}
return nil, fmt.Errorf("no tests")
}
// Otherwise, use the first package named main.
for _, pkg := range pkgs {
if pkg.Object.Name() == "main" {
if pkg.Func("main") == nil {
return nil, fmt.Errorf("no func main() in main package")
}
return pkg, nil
}
}
return nil, fmt.Errorf("no main package")
}
// Create a pointer.Config whose scope is the initial packages of lprog
// and their dependencies.
func setupPTA(prog *ssa.Program, lprog *loader.Program, ptaLog io.Writer, reflection bool) (*pointer.Config, error) {
// TODO(adonovan): the body of this function is essentially
// duplicated in all go/pointer clients. Refactor.
// For each initial package (specified on the command line),
// if it has a main function, analyze that,
// otherwise analyze its tests, if any.
var testPkgs, mains []*ssa.Package
for _, info := range lprog.InitialPackages() {
initialPkg := prog.Package(info.Pkg)
// Add package to the pointer analysis scope.
if initialPkg.Func("main") != nil {
mains = append(mains, initialPkg)
} else {
testPkgs = append(testPkgs, initialPkg)
}
}
if testPkgs != nil {
if p := prog.CreateTestMainPackage(testPkgs...); p != nil {
mains = append(mains, p)
}
}
if mains == nil {
return nil, fmt.Errorf("analysis scope has no main and no tests")
}
return &pointer.Config{
Log: ptaLog,
Reflection: reflection,
Mains: mains,
}, nil
}
// Create a pointer.Config whose scope is the initial packages of lprog
// and their dependencies.
func setupPTA(prog *ssa.Program, lprog *loader.Program, ptaLog io.Writer, reflection bool) (*pointer.Config, error) {
// For each initial package (specified on the command line),
// if it has a main function, analyze that,
// otherwise analyze its tests, if any.
var mains []*ssa.Package
for _, info := range lprog.InitialPackages() {
p := prog.Package(info.Pkg)
// Add package to the pointer analysis scope.
if p.Pkg.Name() == "main" && p.Func("main") != nil {
mains = append(mains, p)
} else if main := prog.CreateTestMainPackage(p); main != nil {
mains = append(mains, main)
}
}
if mains == nil {
return nil, fmt.Errorf("analysis scope has no main and no tests")
}
return &pointer.Config{
Log: ptaLog,
Reflection: reflection,
Mains: mains,
}, nil
}