forked from M-Labs/nac3
97 lines
3.0 KiB
Rust
97 lines
3.0 KiB
Rust
use regex::Regex;
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use std::{
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env,
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fs::File,
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io::Write,
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path::Path,
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process::{Command, Stdio},
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};
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fn main() {
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let out_dir = env::var("OUT_DIR").unwrap();
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let out_dir = Path::new(&out_dir);
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let irrt_dir = Path::new("irrt");
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let irrt_cpp_path = irrt_dir.join("irrt.cpp");
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/*
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* HACK: Sadly, clang doesn't let us emit generic LLVM bitcode.
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* Compiling for WASM32 and filtering the output with regex is the closest we can get.
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*/
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let flags: &[&str] = &[
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"--target=wasm32",
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"-x",
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"c++",
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"-std=c++20",
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"-fno-discard-value-names",
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"-fno-exceptions",
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"-fno-rtti",
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match env::var("PROFILE").as_deref() {
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Ok("debug") => "-O0",
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Ok("release") => "-O3",
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flavor => panic!("Unknown or missing build flavor {flavor:?}"),
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},
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"-emit-llvm",
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"-S",
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"-Wall",
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"-Wextra",
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"-o",
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"-",
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irrt_cpp_path.to_str().unwrap(),
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];
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// Tell Cargo to rerun if any file under `irrt_dir` (recursive) changes
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println!("cargo:rerun-if-changed={}", irrt_dir.to_str().unwrap());
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// Compile IRRT and capture the LLVM IR output
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let output = Command::new("clang-irrt")
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.args(flags)
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.output()
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.map(|o| {
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assert!(o.status.success(), "{}", std::str::from_utf8(&o.stderr).unwrap());
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o
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})
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.unwrap();
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// https://github.com/rust-lang/regex/issues/244
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let output = std::str::from_utf8(&output.stdout).unwrap().replace("\r\n", "\n");
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let mut filtered_output = String::with_capacity(output.len());
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// Filter out irrelevant IR
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//
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// Regex:
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// - `(?ms:^define.*?\}$)` captures LLVM `define` blocks
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// - `(?m:^declare.*?$)` captures LLVM `declare` lines
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let regex_filter = Regex::new(r"(?ms:^define.*?\}$)|(?m:^declare.*?$)").unwrap();
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for f in regex_filter.captures_iter(&output) {
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assert_eq!(f.len(), 1);
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filtered_output.push_str(&f[0]);
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filtered_output.push('\n');
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}
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let filtered_output = Regex::new("(#\\d+)|(, *![0-9A-Za-z.]+)|(![0-9A-Za-z.]+)|(!\".*?\")")
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.unwrap()
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.replace_all(&filtered_output, "");
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// For debugging
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// Doing `DEBUG_DUMP_IRRT=1 cargo build -p nac3core` dumps the LLVM IR generated
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const DEBUG_DUMP_IRRT: &str = "DEBUG_DUMP_IRRT";
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println!("cargo:rerun-if-env-changed={DEBUG_DUMP_IRRT}");
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if env::var(DEBUG_DUMP_IRRT).is_ok() {
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let mut file = File::create(out_dir.join("irrt.ll")).unwrap();
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file.write_all(output.as_bytes()).unwrap();
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let mut file = File::create(out_dir.join("irrt-filtered.ll")).unwrap();
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file.write_all(filtered_output.as_bytes()).unwrap();
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}
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let mut llvm_as = Command::new("llvm-as-irrt")
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.stdin(Stdio::piped())
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.arg("-o")
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.arg(out_dir.join("irrt.bc"))
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.spawn()
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.unwrap();
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llvm_as.stdin.as_mut().unwrap().write_all(filtered_output.as_bytes()).unwrap();
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assert!(llvm_as.wait().unwrap().success());
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}
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