Fix suspensions in debugger source code (replacement for an old, bad fix) (#73)

Author: viuginick1

ext/context.c

@@ -147,13 +147,16 @@ context_create(VALUE thread, VALUE cDebugThread) {
   context->stack_size = 0;
   locations = rb_funcall(thread, rb_intern("backtrace_locations"), 1, INT2FIX(1));
   context->calced_stack_size = locations != Qnil ? RARRAY_LENINT(locations) : 0;
+  context->init_stack_size = -1;
 
   context->stack = NULL;
   context->thnum = ++thnum_current;
   context->thread = thread;
   context->flags = 0;
   context->last_file = NULL;
   context->last_line = -1;
+  context->hit_user_code = 0;
+  context->script_finished = 0;
   context->stop_frame = -1;
   context->thread_pause = 0;
   context->stop_reason = CTX_STOP_NONE;

ext/debase_internals.c

@@ -303,6 +303,8 @@ remove_pause_flag(VALUE thread, VALUE context_object, VALUE ignored)
 static void 
 call_at_line(debug_context_t *context, char *file, int line, VALUE context_object)
 {
+  context->hit_user_code = 1;
+
   rb_hash_foreach(contexts, remove_pause_flag, 0);
   CTX_FL_UNSET(context, CTX_FL_STEPPED);
   CTX_FL_UNSET(context, CTX_FL_FORCE_MOVE);
@@ -331,6 +333,13 @@ process_line_event(VALUE trace_point, void *data)
   tp = TRACE_POINT;
   path = rb_tracearg_path(tp);
 
+  if(context->stack_size <= context->init_stack_size && context->hit_user_code) {
+    context->script_finished = 1;
+  }
+  if(context->script_finished) {
+    return;
+  }
+
   if (is_path_accepted(path)) {
 
     lineno = rb_tracearg_lineno(tp);
@@ -340,6 +349,10 @@ process_line_event(VALUE trace_point, void *data)
     update_stack_size(context);
     print_event(tp, context);
 
+    if(context->init_stack_size == -1) {
+      context->init_stack_size = context->stack_size;
+    }
+
     if (context->thread_pause) {
       context->stop_next = 1;
       context->dest_frame = -1;

ext/debase_internals.h

@@ -60,6 +60,9 @@ typedef struct debug_context {
 
   char *last_file;
   int last_line;
+  int init_stack_size;
+  int script_finished;
+  int hit_user_code;
 } debug_context_t;
 
 typedef struct