1 files changed, 48 insertions, 0 deletions
diff --git a/opcode.h b/opcode.h
new file mode 100644
index 00000000..73948cd5
--- /dev/null
+++ b/opcode.h
@@ -0,0 +1,48 @@
+#ifndef OPCODE_H
+#define OPCODE_H
+#include <assert.h>
+
+typedef enum {
+#define OP(name, imm, in, out) name,
+#include "opcode_list.h"
+#undef OP
+} opcode;
+
+enum {
+  NUM_OPCODES = 
+#define OP(name, imm, in, out) +1
+#include "opcode_list.h"
+#undef OP
+};
+
+enum {
+  OP_HAS_CONSTANT = 2,
+  OP_HAS_VARIABLE = 4,
+  OP_HAS_BRANCH = 8,
+  OP_HAS_SYMBOL = 16,
+  OP_HAS_CFUNC = 32,
+  OP_HAS_UFUNC = 64,
+  OP_IS_CALL_PSEUDO = 128,
+  OP_HAS_VARIABLE_LENGTH_ARGLIST = 256,
+  OP_HAS_BLOCK = 512,
+  OP_HAS_BINDING = 1024,
+};
+struct opcode_description {
+  opcode op;
+  const char* name;
+
+  int flags;
+
+  // length in 16-bit units
+  int length;
+
+  int stack_in, stack_out;
+};
+
+const struct opcode_description* opcode_describe(opcode op);
+
+static inline int opcode_length(opcode op) {
+  return opcode_describe(op)->length;
+}
+
+#endif