feat: Add LLVM backend

lib/Cargo.toml

@@ -26,11 +26,14 @@ smallmap = "*"
 log = "*"
 indexmap = "*"
 uuid = { version = "*", features = ["v4", "fast-rng", "macro-diagnostics", "serde"] }
+inkwell = { version = "*", optional = true, features = ["llvm16-0-no-llvm-linking"] }
 
 [build-dependencies]
 cbindgen = "*"
 lalrpop = { version = "*", optional = true }
+llvm-sys = { version = "160", optional = true, features = ["prefer-dynamic"] }
 
 [features]
-default = ["use_lalrpop"]
-use_lalrpop = ["lalrpop", "lalrpop-util"]
+default = ["use_lalrpop", "llvm_backend"]
+use_lalrpop = ["lalrpop", "lalrpop-util"]
+llvm_backend = ["inkwell", "llvm-sys"]

lib/src/backend/llvm/mod.rs

@@ -0,0 +1,37 @@
+use crate::backend::*;
+use crate::prelude::*;
+use inkwell::builder::Builder;
+use inkwell::context::Context;
+use inkwell::module::Module;
+
+struct LLVMBackendImpl<'ctx> {
+    ctx: &'ctx Context,
+    module: Module<'ctx>,
+    builder: Builder<'ctx>,
+}
+
+pub struct LLVMBackend {}
+
+impl CodeGenBackend for LLVMBackend {
+    type Label = ();
+
+    fn new(mgr: UnitsManager, app: ModuleContext) -> Self {
+        todo!()
+    }
+
+    fn gen_function(self, func: usize) -> Result<Box<dyn TargetCode>, CodeGenError> {
+        todo!()
+    }
+
+    fn define_label<S: AsRef<str>>(&mut self, label: Option<S>) -> Self::Label {
+        todo!()
+    }
+
+    fn gen_variable_load(&mut self, variable: &mut Variable) {
+        todo!()
+    }
+
+    fn gen_operator(&mut self, operator: &mut OperatorExpression) {
+        todo!()
+    }
+}

lib/src/backend/mod.rs

@@ -1,4 +1,7 @@
+#[cfg(feature = "llvm_backend")]
+mod llvm;
 mod lua;
+
 pub use lua::LuaBackend;
 
 use crate::ast::{OperatorExpression, Variable};

viewer/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
-stc-rs = { path = "../lib" }
+stc-rs = { path = "../lib", features = ["llvm_backend", "use_lalrpop"] }
 pretty_env_logger = "*"
 log = "*"
 gtk4 = "*"