added a basic heap inspection utility to the debugger and modified the impl of the buffer object

src/runtime/runtime.c

@@ -6,8 +6,8 @@
 #define MAX_FRAME_STACK 16
 #define MAX_FRAMES 16
 
-typedef struct Frame Frame;
-struct Frame {
+typedef struct xFrame Frame;
+struct xFrame {
 	Frame  *prev;
 	Object *locals;
 	Object *closure;
@@ -25,6 +25,39 @@ struct xRuntime {
 	Heap  *heap;
 };
 
+CallStackScanner *CallStackScanner_New(Runtime *runtime)
+{
+	return runtime->frame;
+}
+
+_Bool CallStackScanner_Next(CallStackScanner **scanner, Object **locals, Object **closure, Executable **exe, int *index)
+{
+	assert(scanner != NULL);
+
+	if(*scanner == NULL)
+		return 0;
+		
+	{
+		Frame *frame = *scanner;
+
+		if(exe) 
+			*exe = frame->exe;
+		
+		if(index) 
+			*index = frame->index;
+
+		if(locals) 
+			*locals = frame->locals;
+		
+		if(closure) 
+			*closure = frame->closure;
+	}
+
+	(*scanner) = ((Frame*) (*scanner))->prev;
+	return 1;
+}
+
+
 Stack *Runtime_GetStack(Runtime *runtime)
 {
 	return Stack_Copy(runtime->stack, 1);