1 files changed, 33 insertions, 0 deletions
diff --git a/opcode.c b/opcode.c
new file mode 100644
index 00000000..bc259c22
--- /dev/null
+++ b/opcode.c
@@ -0,0 +1,33 @@
+#include "opcode.h"
+
+// flags, length
+#define NONE 0, 1
+#define CONSTANT OP_HAS_CONSTANT, 2
+#define VARIABLE (OP_HAS_VARIABLE | OP_HAS_BINDING), 3
+#define BRANCH OP_HAS_BRANCH, 2
+#define CFUNC (OP_HAS_SYMBOL | OP_HAS_CFUNC | OP_HAS_VARIABLE_LENGTH_ARGLIST), 2
+#define UFUNC (OP_HAS_UFUNC | OP_HAS_VARIABLE_LENGTH_ARGLIST), 2
+#define CLOSURE_PARAM_IMM (OP_IS_CALL_PSEUDO | OP_HAS_BINDING), 0
+#define CLOSURE_CREATE_IMM (OP_HAS_BLOCK | OP_IS_CALL_PSEUDO | OP_HAS_BINDING), 0
+#define CLOSURE_CREATE_C_IMM (OP_IS_CALL_PSEUDO | OP_HAS_BINDING), 0
+#define CLOSURE_REF_IMM (OP_IS_CALL_PSEUDO | OP_HAS_BINDING), 2
+
+#define OP(name, imm, in, out) \
+  {name, #name, imm, in, out},
+
+static const struct opcode_description opcode_descriptions[] = {
+#include "opcode_list.h"
+};
+
+static const struct opcode_description invalid_opcode_description = {
+  -1, "#INVALID", 0, 0, 0, 0
+};
+
+
+const struct opcode_description* opcode_describe(opcode op) {
+  if ((int)op >= 0 && (int)op < NUM_OPCODES) {
+    return &opcode_descriptions[op];
+  } else {
+    return &invalid_opcode_description;
+  }
+}