Fix bug : reference invalid (#393)

* fix an fatal error

* fix bug : rerefrence invaild

* implement better exception support

src/debugger/core.c

@@ -114,6 +114,8 @@ void c11_debugger_exception_on_trace(py_Ref exc) {
     debugger.current_excname = name;
     debugger.current_excmessage = message;
     clear_structures();
+    py_assign(py_list_getitem(python_vars, 0), exc);
+    py_clearexc(NULL);
 }
 
 const char* c11_debugger_excinfo(const char** message) {
@@ -178,6 +180,8 @@ bool c11_debugger_path_equal(const char* path1, const char* path2) {
 C11_STOP_REASON c11_debugger_should_pause() {
     if(debugger.current_event == TRACE_EVENT_POP && !debugger.isexceptionmode)
         return C11_DEBUGGER_NOSTOP;
+    if(py_checkexc() && debugger.isexceptionmode == false)
+        return C11_DEBUGGER_NOSTOP;
     C11_STOP_REASON pause_resaon = C11_DEBUGGER_NOSTOP;
     int is_out = debugger.curr_stack_depth <= debugger.pause_allowed_depth;
     int is_new_line = debugger.current_line != debugger.step_line;
@@ -282,8 +286,8 @@ inline static c11_debugger_scope_index append_new_scope(int frameid) {
     py_Frame* requested_frame = c11__getitem(py_Frame*, &debugger.py_frames, frameid);
     int base_index = py_list_len(python_vars);
     py_Ref new_locals = py_list_emplace(python_vars);
-    py_Ref new_globals = py_list_emplace(python_vars);
     py_Frame_newlocals(requested_frame, new_locals);
+    py_Ref new_globals = py_list_emplace(python_vars);
     py_Frame_newglobals(requested_frame, new_globals);
     c11_debugger_scope_index result = {.locals_ref = base_index, .globals_ref = base_index + 1};
     return result;

src/public/internal.c

@@ -260,7 +260,7 @@ bool pk_loadmethod(py_StackRef self, py_Name name) {
                 self[0] = *py_getslot(cls_var, 0);
                 self[1] = ti->self;
                 break;
-            default: c11__unreachable();
+            default: return false;
         }
         return true;
     }

src/public/py_exception.c

@@ -158,12 +158,14 @@ bool py_matchexc(py_Type type) {
 void py_clearexc(py_StackRef p0) {
     VM* vm = pk_current_vm;
     py_newnil(&vm->unhandled_exc);
-    if(p0) vm->stack.sp = p0;
+    if(p0) {
+        c11__rtassert(p0 >= vm->stack.begin && p0 <= vm->stack.sp);
+        vm->stack.sp = p0;
+    }
 }
 
 static void c11_sbuf__write_exc(c11_sbuf* self, py_Ref exc) {
-    if(true) { c11_sbuf__write_cstr(self, "Traceback (most recent call last):\n"); }
-
+    c11_sbuf__write_cstr(self, "Traceback (most recent call last):\n");
     BaseException* ud = py_touserdata(exc);
 
     for(int i = ud->stacktrace.length - 1; i >= 0; i--) {

tests/95_bugs.py

@@ -169,4 +169,14 @@ for x in xs:
     xs.append(x+1)
 
 assert res == list(range(101))
-assert xs == res
+assert xs == res
+
+# call property
+from vmath import vec2
+
+a = vec2(1, 2)
+try:
+    x = a.x()
+    exit(1)
+except TypeError:
+    pass