// 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")
}
// GetMainPkg returns main package of a command.
func MainPkg(prog *ssa.Program) *ssa.Package {
pkgs := prog.AllPackages()
for _, pkg := range pkgs {
if pkg.Pkg.Name() == "main" {
return pkg
}
}
return nil // Not found
}
// findVisibleConsts returns a mapping from each package-level constant assignable to type "error", to nil.
func findVisibleConsts(prog *ssa.Program, qpos *queryPos) map[ssa.Const]*ssa.NamedConst {
constants := make(map[ssa.Const]*ssa.NamedConst)
for _, pkg := range prog.AllPackages() {
for _, mem := range pkg.Members {
obj, ok := mem.(*ssa.NamedConst)
if !ok {
continue
}
consttype := obj.Type()
if !types.AssignableTo(consttype, builtinErrorType) {
continue
}
if !isAccessibleFrom(obj.Object(), qpos.info.Pkg) {
continue
}
constants[*obj.Value] = obj
}
}
return constants
}
// findVisibleErrs returns a mapping from each package-level variable of type "error" to nil.
func findVisibleErrs(prog *ssa.Program, qpos *queryPos) map[*ssa.Global]ssa.Value {
globals := make(map[*ssa.Global]ssa.Value)
for _, pkg := range prog.AllPackages() {
for _, mem := range pkg.Members {
gbl, ok := mem.(*ssa.Global)
if !ok {
continue
}
gbltype := gbl.Type()
// globals are always pointers
if !types.Identical(deref(gbltype), builtinErrorType) {
continue
}
if !isAccessibleFrom(gbl.Object(), qpos.info.Pkg) {
continue
}
globals[gbl] = nil
}
}
return globals
}