Add a bytecode interpreter.

I wrote it in C because I actually like programming in C. Turns out
setting up a Makefile is really easy too.

1 files changed, 42 insertions, 0 deletions

diff --git a/bytecode/value.c b/bytecode/value.c
new file mode 100644
index 0000000..2a15b44
--- /dev/null
+++ b/bytecode/value.c
@@ -0,0 +1,42 @@
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "panic.h"
+
+#include "value.h"
+
+bool is_int(value v)
+{
+	return v & 0x1;
+}
+
+int64_t to_int(value v)
+{
+	if (!is_int(v)) {
+		panicf("value %lx is not an int!\n", v);
+	}
+	return (int64_t) v >> 1;
+}
+
+value from_int(int64_t i)
+{
+	return i << 1 | 0x1;
+}
+
+bool is_pointer(value v)
+{
+	return v && !(v & 0x7);
+}
+
+value *to_pointer(value v)
+{
+	if (!is_pointer(v)) {
+		panicf("value %lx is not a pointer!\n", v);
+	}
+	return (value *) v;
+}
+
+value from_pointer(value *p)
+{
+	return (value) p;
+}