Initial commit

1 files changed, 38 insertions, 0 deletions

diff --git a/src/value.h b/src/value.h
new file mode 100644
index 0000000..a932514
--- /dev/null
+++ b/src/value.h
@@ -0,0 +1,38 @@
+#ifndef IMB3_VALUE_H
+#define IMB3_VALUE_H
+
+#include <stdint.h>
+
+struct value {
+  uintptr_t bits;
+};
+
+enum value_tag {
+  /**
+   * A big integer or the nil constant.
+   */
+  TAG_BIGINT_OR_NIL = 0b000,
+
+  /**
+   * Fixnums, i.e. integers that are stored directly in the value rather than
+   * being pointed to. This is a two-bit tag rather than a three-bit tag...
+   */
+  VALUE_FIXNUM = 0b01,
+
+  /**
+   * A builtin-object.
+   */
+  TAG_BUILTIN_OBJECT = 0b010,
+
+  /**
+   * A simple-array, i.e. an array of values without a fill-pointer.
+   */
+  TAG_SIMPLE_ARRAY = 0b100,
+
+  /**
+   * A standard-object, effectively a pair of a class and a slot array.
+   */
+  TAG_STANDARD_OBJECT = 0b110,
+};
+
+#endif // IMB3_VALUE_H