diff --git a/src/lib.rs b/src/lib.rs
index e69de29..76ada1a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -0,0 +1,2 @@
+pub mod parser;
+pub mod runtime;
diff --git a/src/parser/ast.rs b/src/parser/ast.rs
new file mode 100644
index 0000000..2dc1543
--- /dev/null
+++ b/src/parser/ast.rs
@@ -0,0 +1,21 @@
+pub struct Program {
+    pub functions: Vec<Function>,
+}
+
+pub struct Function {
+    pub name: String,
+    pub params: Vec<String>,
+    pub body: Vec<Instruction>,
+}
+
+pub struct Instruction {
+    pub opcode: String,
+    pub operands: Vec<Operand>,
+}
+
+pub enum Operand {
+    Global(String),
+    Local(String),
+    Number(i64),
+    Pointer(Box<Operand>),
+}
\ No newline at end of file
diff --git a/src/grammar.pest b/src/parser/grammar.pest
similarity index 100%
rename from src/grammar.pest
rename to src/parser/grammar.pest
diff --git a/src/parser/mod.rs b/src/parser/mod.rs
new file mode 100644
index 0000000..851c0bc
--- /dev/null
+++ b/src/parser/mod.rs
@@ -0,0 +1 @@
+pub mod ast;
diff --git a/src/runtime.rs b/src/runtime.rs
new file mode 100644
index 0000000..e69de29