1 files changed, 19 insertions, 0 deletions
diff --git a/tvix/eval/src/opcode.rs b/tvix/eval/src/opcode.rs
new file mode 100644
index 000000000000..b43f75efaa8f
--- /dev/null
+++ b/tvix/eval/src/opcode.rs
@@ -0,0 +1,19 @@
+//! This module implements the instruction set running on the abstract
+//! machine implemented by tvix.
+
+#[derive(Clone, Copy, Debug)]
+pub struct ConstantIdx(pub usize);
+
+#[derive(Clone, Copy, Debug)]
+pub struct CodeIdx(pub usize);
+
+#[derive(Clone, Copy, Debug)]
+pub enum OpCode {
+    // Push a constant onto the stack.
+    OpConstant(ConstantIdx),
+
+    // Push a literal value.
+    OpNull,
+    OpTrue,
+    OpFalse,
+}