feat(optimizer): add initial IR optimization module with placeholder function

Author: Arnaud Riess

crates/herkos/src/lib.rs

@@ -6,6 +6,7 @@
 pub mod backend;
 pub mod codegen;
 pub mod ir;
+pub mod optimizer;
 pub mod parser;
 
 // Re-export key types for convenience
@@ -14,6 +15,7 @@ use backend::SafeBackend;
 use codegen::CodeGenerator;
 use ir::builder::build_module_info;
 use ir::ModuleInfo;
+use optimizer::optimize_ir;
 use parser::parse_wasm;
 
 /// Configuration options for transpilation
@@ -63,6 +65,9 @@ pub fn transpile(wasm_bytes: &[u8], options: &TranspileOptions) -> Result<String
     let module_info =
         build_module_info(&parsed, options).context("failed to build module metadata")?;
 
+    // Optimize the IR
+    let module_info = optimize_ir(module_info)?;
+
     // Generate Rust source code
     let rust_code = generate_rust_code(&module_info)?;
 

crates/herkos/src/optimizer.rs

@@ -0,0 +1,16 @@
+//! IR optimization passes.
+//!
+//! This module implements optimizations on the intermediate representation (IR)
+//! to improve code generation quality and runtime performance.
+
+use crate::ir::ModuleInfo;
+use anyhow::Result;
+
+/// Optimizes the IR representation.
+///
+/// Currently a no-op placeholder. Will implement IR-level optimizations
+/// such as constant folding, dead code elimination, etc.
+pub fn optimize_ir(module_info: ModuleInfo) -> Result<ModuleInfo> {
+    // TODO: implement IR optimizations
+    Ok(module_info)
+}