skeleton for codegen

cranelift/isle/src/compile.rs

@@ -3,9 +3,9 @@
 use crate::error::Error;
 use crate::{ast, codegen, sema};
 
-pub fn compile(defs: &ast::Defs) -> Result<codegen::Automata, Error> {
+pub fn compile(defs: &ast::Defs) -> Result<String, Error> {
     let mut typeenv = sema::TypeEnv::from_ast(defs)?;
     let termenv = sema::TermEnv::from_ast(&mut typeenv, defs)?;
-    let automata = codegen::Automata::compile(&typeenv, &termenv)?;
-    Ok(automata)
+    let codegen = codegen::Codegen::compile(&typeenv, &termenv)?;
+    codegen.generate_rust()
 }