func (u *Unexporter) isInterfaceMethod(e Export) map[string][]*types.Package {
if _, ok := e.obj.(*types.Func); !ok {
return nil
}
f := e.obj.(*types.Func)
r := f.Type().(*types.Signature).Recv()
if r == nil {
return nil
}
if u.f == nil {
calculateConstraints(u)
}
interfaces := make(map[string][]*types.Package)
for constraint := range u.f {
if constraint.RHS == r.Type() && types.IsInterface(constraint.LHS) {
sure, _, _ := types.LookupFieldOrMethod(constraint.LHS, true, f.Pkg(), f.Name())
if sure != nil {
interfaces[constraint.LHS.String()] = append(interfaces[constraint.LHS.String()], f.Pkg())
}
}
}
return interfaces
}
func isInterface(t types.Type) bool { return types.IsInterface(t) }
func isInterface(T types.Type) bool { return types.IsInterface(T) }
// Callees reports the possible callees of the function call site
// identified by the specified source location.
func callees(q *Query) error {
lconf := loader.Config{Build: q.Build}
if err := setPTAScope(&lconf, q.Scope); err != nil {
return err
}
// Load/parse/type-check the program.
lprog, err := lconf.Load()
if err != nil {
return err
}
q.Fset = lprog.Fset
qpos, err := parseQueryPos(lprog, q.Pos, true) // needs exact pos
if err != nil {
return err
}
// Determine the enclosing call for the specified position.
var e *ast.CallExpr
for _, n := range qpos.path {
if e, _ = n.(*ast.CallExpr); e != nil {
break
}
}
if e == nil {
return fmt.Errorf("there is no function call here")
}
// TODO(adonovan): issue an error if the call is "too far
// away" from the current selection, as this most likely is
// not what the user intended.
// Reject type conversions.
if qpos.info.Types[e.Fun].IsType() {
return fmt.Errorf("this is a type conversion, not a function call")
}
// Deal with obviously static calls before constructing SSA form.
// Some static calls may yet require SSA construction,
// e.g. f := func(){}; f().
switch funexpr := unparen(e.Fun).(type) {
case *ast.Ident:
switch obj := qpos.info.Uses[funexpr].(type) {
case *types.Builtin:
// Reject calls to built-ins.
return fmt.Errorf("this is a call to the built-in '%s' operator", obj.Name())
case *types.Func:
// This is a static function call
q.result = &calleesTypesResult{
site: e,
callee: obj,
}
return nil
}
case *ast.SelectorExpr:
sel := qpos.info.Selections[funexpr]
if sel == nil {
// qualified identifier.
// May refer to top level function variable
// or to top level function.
callee := qpos.info.Uses[funexpr.Sel]
if obj, ok := callee.(*types.Func); ok {
q.result = &calleesTypesResult{
site: e,
callee: obj,
}
return nil
}
} else if sel.Kind() == types.MethodVal {
recvtype := sel.Recv()
if !types.IsInterface(recvtype) {
// static method call
q.result = &calleesTypesResult{
site: e,
callee: sel.Obj().(*types.Func),
}
return nil
}
}
}
prog := ssautil.CreateProgram(lprog, ssa.GlobalDebug)
ptaConfig, err := setupPTA(prog, lprog, q.PTALog, q.Reflection)
if err != nil {
return err
}
pkg := prog.Package(qpos.info.Pkg)
if pkg == nil {
return fmt.Errorf("no SSA package")
}
// Defer SSA construction till after errors are reported.
prog.BuildAll()
// Ascertain calling function and call site.
callerFn := ssa.EnclosingFunction(pkg, qpos.path)
if callerFn == nil {
return fmt.Errorf("no SSA function built for this location (dead code?)")
}
// Find the call site.
site, err := findCallSite(callerFn, e)
if err != nil {
return err
}
funcs, err := findCallees(ptaConfig, site)
if err != nil {
return err
}
q.result = &calleesSSAResult{
site: site,
funcs: funcs,
}
return nil
}