Compile to LLVM bitcode

.gitignore

@@ -1,14 +1,5 @@
-_build
+result*
-
-
-
-# Added by cargo
-
 /target
 
-
+*.bc
-# Added by cargo
+*.ll
-#
-# already existing elements were commented out
-
-#/target

Cargo.lock

@@ -64,6 +64,12 @@ version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
+[[package]]
+name = "cc"
+version = "1.0.73"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2fff2a6927b3bb87f9595d67196a70493f627687a71d87a0d692242c33f58c11"
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
@@ -139,6 +145,7 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "clap",
+ "inkwell",
  "lalrpop",
  "lalrpop-util",
 ]
@@ -206,6 +213,29 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "inkwell"
+version = "0.1.0"
+source = "git+https://github.com/TheDan64/inkwell?branch=master#36c3b106e61b1b45295a35f94023d93d9328c76f"
+dependencies = [
+ "either",
+ "inkwell_internals",
+ "libc",
+ "llvm-sys",
+ "once_cell",
+ "parking_lot",
+]
+
+[[package]]
+name = "inkwell_internals"
+version = "0.5.0"
+source = "git+https://github.com/TheDan64/inkwell?branch=master#36c3b106e61b1b45295a35f94023d93d9328c76f"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "itertools"
 version = "0.10.3"
@@ -259,6 +289,19 @@ version = "0.2.121"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "efaa7b300f3b5fe8eb6bf21ce3895e1751d9665086af2d64b42f19701015ff4f"
 
+[[package]]
+name = "llvm-sys"
+version = "120.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce76f8393b7a607a906087666db398d872db739622e644e58552c198ccdfdf45"
+dependencies = [
+ "cc",
+ "lazy_static",
+ "libc",
+ "regex",
+ "semver",
+]
+
 [[package]]
 name = "lock_api"
 version = "0.4.7"
@@ -328,6 +371,15 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "pest"
+version = "2.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "10f4872ae94d7b90ae48754df22fd42ad52ce740b8f370b03da4835417403e53"
+dependencies = [
+ "ucd-trie",
+]
+
 [[package]]
 name = "petgraph"
 version = "0.5.1"
@@ -450,6 +502,24 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 
+[[package]]
+name = "semver"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f301af10236f6df4160f7c3f04eec6dbc70ace82d23326abad5edee88801c6b6"
+dependencies = [
+ "semver-parser",
+]
+
+[[package]]
+name = "semver-parser"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "00b0bef5b7f9e0df16536d3961cfb6e84331c065b4066afb39768d0e319411f7"
+dependencies = [
+ "pest",
+]
+
 [[package]]
 name = "siphasher"
 version = "0.3.10"
@@ -547,6 +617,12 @@ dependencies = [
  "crunchy",
 ]
 
+[[package]]
+name = "ucd-trie"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56dee185309b50d1f11bfedef0fe6d036842e3fb77413abef29f8f8d1c5d4c1c"
+
 [[package]]
 name = "unicode-xid"
 version = "0.2.2"

Cargo.toml

@@ -8,5 +8,10 @@ anyhow = "1.0.56"
 clap = { version = "3.1.8", features = ["derive"] }
 lalrpop-util = { version = "0.19.7", features = ["lexer"] }
 
+[dependencies.inkwell]
+git = "https://github.com/TheDan64/inkwell"
+branch = "master"
+features = ["llvm12-0"]
+
 [build-dependencies]
 lalrpop = "0.19.7"

default.nix

@@ -0,0 +1,15 @@
+{ rustPlatform, lib, nix-gitignore, llvmPackages_12 }:
+
+let llvmPkgs = llvmPackages_12;
+
+in with llvmPkgs;
+
+rustPlatform.buildRustPackage {
+  name = "e0";
+  src = nix-gitignore.gitignoreSource [ ./.gitignore ] ./.;
+
+  buildInputs = [ llvmPkgs.llvm.dev ];
+
+  cargoSha256 = lib.fakeSha256;
+  # cargoSha256 = "sha256-rWMnlkb/XoycP69NOOmg7Wd4qPgliuvOKGWaEth/8tg=";
+}

flake.lock

@@ -0,0 +1,41 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1648219316,
+        "narHash": "sha256-Ctij+dOi0ZZIfX5eMhgwugfvB+WZSrvVNAyAuANOsnQ=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "30d3d79b7d3607d56546dd2a6b49e156ba0ec634",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "utils": "utils"
+      }
+    },
+    "utils": {
+      "locked": {
+        "lastModified": 1648297722,
+        "narHash": "sha256-W+qlPsiZd8F3XkzXOzAoR+mpFqzm3ekQkJNa+PIh1BQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "0f8662f1319ad6abf89b3380dd2722369fc51ade",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,16 @@
+{
+  description = "A very basic flake";
+
+  inputs = { utils.url = "github:numtide/flake-utils"; };
+
+  outputs = { self, nixpkgs, utils }:
+    utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+        myPkgs = rec { e0 = pkgs.callPackage ./. { }; };
+
+      in rec {
+        packages = utils.lib.flattenTree myPkgs;
+        defaultPackage = packages.e0;
+      });
+}

src/ast.rs

@@ -1,10 +1,20 @@
 use anyhow::Result;
+use inkwell::{context::Context, module::Module};
 
 #[derive(Debug)]
 pub enum Decl {
     Func(Func),
 }
 
+impl Decl {
+    pub fn unwrap_func(&self) -> Option<&Func> {
+        match self {
+            Decl::Func(func) => Some(func),
+            _ => None,
+        }
+    }
+}
+
 #[derive(Debug)]
 pub struct Func {
     pub name: String,
@@ -27,6 +37,22 @@ pub enum Type {
     Int,
 }
 
-pub fn convert(program: Vec<Decl>) -> Result<String> {
+pub fn convert(context: &mut Context, program: Vec<Decl>) -> Result<Module> {
-    Ok(String::new())
+    let module = context.create_module("program");
+    let builder = context.create_builder();
+
+    for func in program.iter().filter_map(Decl::unwrap_func) {
+        // TODO: hardcoded void -> int function
+        let i64_ty = context.i64_type();
+        let llvm_func_ty = i64_ty.fn_type(&[], false);
+
+        let llvm_func = module.add_function(&func.name, llvm_func_ty, None);
+        let entry_block = context.append_basic_block(llvm_func, "entry");
+
+        builder.position_at_end(entry_block);
+
+        builder.build_return(None);
+    }
+
+    Ok(module)
 }

src/main.rs

@@ -7,17 +7,21 @@ lalrpop_mod!(parser);
 
 mod ast;
 
-use std::fs;
+use std::fs::{self, File};
 use std::path::PathBuf;
 
 use anyhow::Result;
 use clap::Parser;
+use inkwell::context::Context;
 
 use crate::parser::ProgramParser;
 
 #[derive(Debug, Parser)]
 struct Opt {
     path: PathBuf,
+
+    #[clap(short = 'o', long = "out")]
+    out_path: PathBuf,
 }
 
 fn main() -> Result<()> {
@@ -29,5 +33,14 @@ fn main() -> Result<()> {
     let ast = parser.parse(&contents).unwrap();
     println!("AST: {ast:?}");
 
+    let mut context = Context::create();
+    let module = ast::convert(&mut context, ast)?;
+
+    {
+        let file = File::create(&opts.out_path)?;
+        module.write_bitcode_to_file(&file, true, true);
+        println!("Emitted.");
+    }
+
     Ok(())
 }

src/parser.lalrpop

@@ -9,7 +9,8 @@ Decl: Decl = {
 };
 
 Func: Func = {
-    "fn" <name:Ident> "(" ")" "->" <return_ty:Type> "{" <stmts:Stmt*> "}" => Func { name, return_ty, stmts },
+    "fn" <name:Ident> "(" ")" "->" <return_ty:Type> "{" <stmts:Stmt*> "}" =>
+        Func { name, return_ty, stmts },
 };
 
 Stmt: Stmt = {