feat(backend): Add backend

src/ir/types.rs

@@ -43,6 +43,15 @@ pub enum IRType {
     I1,
     Void,
 }
+impl IRType {
+    pub fn size_in_bytes(&self) -> usize {
+        match self {
+            IRType::I32 => 4,
+            IRType::I1 => 1,
+            IRType::Void => 0,
+        }
+    }
+}
 impl Display for IRType {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
@@ -72,7 +81,7 @@ impl Display for MoveRValue {
         }
     }
 }
-#[derive(Clone, Copy)]
+#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
 pub enum VariableType {
     Global,
     ParamTemp,
@@ -86,6 +95,28 @@ pub struct Variable {
     pub var_type: VariableType,
     pub data_type: IRType,
 }
+impl PartialEq for Variable {
+    fn eq(&self, other: &Self) -> bool {
+        self.index == other.index && self.var_type == other.var_type
+    }
+}
+impl Eq for Variable {}
+impl PartialOrd for Variable {
+    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+        Some(match self.index.cmp(&other.index) {
+            std::cmp::Ordering::Equal => self.var_type.cmp(&other.var_type),
+            ord => ord,
+        })
+    }
+}
+impl Ord for Variable {
+    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+        match self.index.cmp(&other.index) {
+            std::cmp::Ordering::Equal => self.var_type.cmp(&other.var_type),
+            ord => ord,
+        }
+    }
+}
 impl Display for Variable {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         let prefix = match self.var_type {