Emerge Yul recompiler (#1)

Provide a modified (and incomplete) version of ZKSync zksolc that can compile the most basic contracts

crates/llvm-context/src/eravm/context/function/yul_data.rs

@@ -0,0 +1,53 @@
+//!
+//! The LLVM function Yul data.
+//!
+
+use std::collections::HashMap;
+
+use num::BigUint;
+
+///
+/// The LLVM function Yul data.
+///
+/// Describes some data that is only relevant to Yul.
+///
+#[derive(Debug)]
+pub struct YulData {
+    /// The constants saved to variables. Used for peculiar cases like call simulation.
+    /// It is a partial implementation of the constant propagation.
+    constants: HashMap<String, BigUint>,
+}
+
+impl Default for YulData {
+    fn default() -> Self {
+        Self {
+            constants: HashMap::with_capacity(Self::CONSTANTS_HASHMAP_INITIAL_CAPACITY),
+        }
+    }
+}
+
+impl YulData {
+    /// The constants hashmap default capacity.
+    const CONSTANTS_HASHMAP_INITIAL_CAPACITY: usize = 16;
+
+    ///
+    /// A shortcut constructor.
+    ///
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    ///
+    /// Returns a constant if it has been saved.
+    ///
+    pub fn get_constant(&self, name: &str) -> Option<BigUint> {
+        self.constants.get(name).cloned()
+    }
+
+    ///
+    /// Saves a constant detected with the partial constant propagation.
+    ///
+    pub fn insert_constant(&mut self, name: String, value: BigUint) {
+        self.constants.insert(name, value);
+    }
+}