Update homework 1 and 2

src/opt/simplify_cfg.rs

@@ -0,0 +1,48 @@
+use crate::ir::*;
+use crate::*;
+
+pub type SimplifyCfg = Repeat<(SimplifyCfgConstProp, (SimplifyCfgReach, SimplifyCfgMerge))>;
+
+impl Optimize<TranslationUnit> for SimplifyCfg {
+    fn optimize(&mut self, code: &mut TranslationUnit) -> bool {
+        code.decls.iter_mut().any(|(_, decl)| self.optimize(decl))
+    }
+}
+
+impl Optimize<Declaration> for SimplifyCfg {
+    fn optimize(&mut self, code: &mut Declaration) -> bool {
+        let (_fsig, fdef) = some_or!(code.get_function_mut(), return false);
+        let fdef = some_or!(fdef, return false);
+        self.optimize(fdef)
+    }
+}
+
+/// Simplifies block exits by propagating constants.
+#[derive(Default)]
+pub struct SimplifyCfgConstProp {}
+
+/// Retains only those blocks that are reachable from the init.
+#[derive(Default)]
+pub struct SimplifyCfgReach {}
+
+/// Merges two blocks if a block is pointed to only by another
+#[derive(Default)]
+pub struct SimplifyCfgMerge {}
+
+impl Optimize<FunctionDefinition> for SimplifyCfgConstProp {
+    fn optimize(&mut self, _code: &mut FunctionDefinition) -> bool {
+        todo!("homework 3")
+    }
+}
+
+impl Optimize<FunctionDefinition> for SimplifyCfgReach {
+    fn optimize(&mut self, _code: &mut FunctionDefinition) -> bool {
+        todo!("homework 3")
+    }
+}
+
+impl Optimize<FunctionDefinition> for SimplifyCfgMerge {
+    fn optimize(&mut self, _code: &mut FunctionDefinition) -> bool {
+        todo!("homework 3")
+    }
+}