diff --git a/sys/object_info.h b/sys/object_info.h
new file mode 100644
index 0000000..2578747
--- /dev/null
+++ b/sys/object_info.h
@@ -0,0 +1,70 @@
+#ifndef LPC_OBJECT_INFO_H_
+#define LPC_OBJECT_INFO_H_
+
+/* Definition of argument values for object_info()
+ */
+
+#include "configuration.h"
+
+/* Object flags */
+#define OI_ONCE_INTERACTIVE             -1
+#define OI_RESET_STATE                  -2
+#define OI_WILL_CLEAN_UP                -3
+#define OI_LAMBDA_REFERENCED            -4
+#define OI_REPLACED                     -5
+
+/* Program flags */
+#define OI_NO_INHERIT                   -10
+#define OI_NO_CLONE                     -11
+#define OI_NO_SHADOW                    -12
+#define OI_SHARE_VARIABLES              -13
+
+/* Swapping */
+#define OI_SWAPPED                      -20
+#define OI_PROG_SWAPPED                 -21
+#define OI_VAR_SWAPPED                  -22
+#define OI_SWAP_NUM                     -23
+
+/* Timing */
+#define OI_NEXT_RESET_TIME              -30
+#define OI_NEXT_CLEANUP_TIME            -31
+#define OI_LAST_REF_TIME                -32
+
+/* Object list */
+#define OI_OBJECT_NEXT                  -40
+#define OI_OBJECT_PREV                  -41
+#define OI_OBJECT_POS                   -42
+
+/* Shadows */
+#define OI_SHADOW_NEXT                  -50
+#define OI_SHADOW_PREV                  -51
+#define OI_SHADOW_ALL                   -52
+
+/* Statistics about the object */
+#define OI_OBJECT_REFS                  -60
+#define OI_TICKS                        -61
+#define OI_GIGATICKS                    -62
+#define OI_DATA_SIZE                    -63
+#define OI_DATA_SIZE_TOTAL              -64
+
+/* Statistics about the program */
+#define OI_PROG_REFS                    -70
+
+#define OI_NUM_FUNCTIONS                -71
+#define OI_NUM_VARIABLES                -72
+#define OI_NUM_STRINGS                  -73
+#define OI_NUM_INHERITED                -74
+#define OI_NUM_INCLUDED                 -75
+
+#define OI_SIZE_FUNCTIONS               -76
+#define OI_SIZE_VARIABLES               -77
+#define OI_SIZE_STRINGS                 -78
+#define OI_SIZE_STRINGS_DATA            -79
+#define OI_SIZE_STRINGS_DATA_TOTAL      -80
+#define OI_SIZE_INHERITED               -81
+#define OI_SIZE_INCLUDED                -82
+
+#define OI_PROG_SIZE                    -83
+#define OI_PROG_SIZE_TOTAL              -84
+
+#endif /* LPC_OBJECT_INFO_H_ */