proc: Remove unused code

pkg/proc/proc.go

@@ -220,7 +220,7 @@ func Step(dbp Process) (err error) {
 
 	if err = next(dbp, true); err != nil {
 		switch err.(type) {
-		case ThreadBlockedError, NoReturnAddr: // Noop
+		case ThreadBlockedError: // Noop
 		default:
 			dbp.ClearInternalBreakpoints()
 			return

pkg/proc/proc_test.go

@@ -676,7 +676,7 @@ func returnAddress(thread proc.Thread) (uint64, error) {
 		return 0, err
 	}
 	if len(locations) < 2 {
-		return 0, proc.NoReturnAddr{locations[0].Current.Fn.BaseName()}
+		return 0, fmt.Errorf("no return address for function: %s", locations[0].Current.Fn.BaseName())
 	}
 	return locations[1].Current.PC, nil
 }

pkg/proc/stack.go

@@ -13,16 +13,6 @@ import (
 // This code is partly adaped from runtime.gentraceback in
 // $GOROOT/src/runtime/traceback.go
 
-// NoReturnAddr is returned when return address
-// could not be found during stack trace.
-type NoReturnAddr struct {
-	Fn string
-}
-
-func (nra NoReturnAddr) Error() string {
-	return fmt.Sprintf("could not find return address for %s", nra.Fn)
-}
-
 // Stackframe represents a frame in a system stack.
 type Stackframe struct {
 	// Address the function above this one on the call stack will return to.

pkg/proc/variables.go

@@ -360,12 +360,6 @@ func (scope *EvalScope) PtrSize() int {
 	return scope.BinInfo.Arch.PtrSize()
 }
 
-// ChanRecvBlocked returns whether the goroutine is blocked on
-// a channel read operation.
-func (g *G) ChanRecvBlocked() bool {
-	return (g.Thread == nil) && (g.WaitReason == chanRecv)
-}
-
 // NoGError returned when a G could not be found
 // for a specific thread.
 type NoGError struct {