Emerge Yul recompiler (#1)

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

crates/stdlib/src/lib.rs

@@ -0,0 +1,36 @@
+//! This crate vendors EVM related standard library functionality and provides a LLVM module,
+//! exporting the standard library functions.
+//!
+//! The standard library code is inherited and adapted from [0].
+//!
+//! [0]: [https://github.com/matter-labs/era-compiler-llvm/blob/v1.4.1/llvm/lib/Target/EraVM/eravm-stdlib.ll]
+//!
+
+use inkwell::{context::Context, memory_buffer::MemoryBuffer, module::Module, support::LLVMString};
+
+include!(concat!(env!("OUT_DIR"), "/stdlib.rs"));
+
+/// Creates a LLVM module from [BITCODE].
+///
+/// The module exports a bunch of EVM related "stdlib" functions.
+///
+/// Returns `Error` if the bitcode fails to parse, which should never happen.
+pub fn module<'context>(
+    context: &'context Context,
+    module_name: &str,
+) -> Result<Module<'context>, LLVMString> {
+    let buf = MemoryBuffer::create_from_memory_range(BITCODE, module_name);
+    Module::parse_bitcode_from_buffer(&buf, context)
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn it_works() {
+        inkwell::targets::Target::initialize_riscv(&Default::default());
+        let context = inkwell::context::Context::create();
+        let module = crate::module(&context, "stdlib").unwrap();
+
+        assert!(module.get_function("__signextend").is_some());
+    }
+}