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| 1 | +//! The only difference between this and cg_clif.rs is that this binary defaults to using cg_llvm |
| 2 | +//! instead of cg_clif and requires `--clif` to use cg_clif and that this binary doesn't have JIT |
| 3 | +//! support. |
| 4 | +//! This is necessary as with Cargo `RUSTC` applies to both target crates and host crates. The host |
| 5 | +//! crates must be built with cg_llvm as we are currently building a sysroot for cg_clif. |
| 6 | +//! `RUSTFLAGS` however is only applied to target crates, so `--clif` would only be passed to the |
| 7 | +//! target crates. |
| 8 | +
|
| 9 | +#![feature(rustc_private)] |
| 10 | + |
| 11 | +extern crate rustc_data_structures; |
| 12 | +extern crate rustc_driver; |
| 13 | +extern crate rustc_interface; |
| 14 | +extern crate rustc_session; |
| 15 | +extern crate rustc_target; |
| 16 | + |
| 17 | +use std::path::PathBuf; |
| 18 | + |
| 19 | +use rustc_interface::interface; |
| 20 | +use rustc_session::config::ErrorOutputType; |
| 21 | +use rustc_session::early_error; |
| 22 | +use rustc_target::spec::PanicStrategy; |
| 23 | + |
| 24 | +fn find_sysroot() -> String { |
| 25 | + // Taken from https://github.com/Manishearth/rust-clippy/pull/911. |
| 26 | + let home = option_env!("RUSTUP_HOME").or(option_env!("MULTIRUST_HOME")); |
| 27 | + let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN")); |
| 28 | + match (home, toolchain) { |
| 29 | + (Some(home), Some(toolchain)) => format!("{}/toolchains/{}", home, toolchain), |
| 30 | + _ => option_env!("RUST_SYSROOT") |
| 31 | + .expect("need to specify RUST_SYSROOT env var or use rustup or multirust") |
| 32 | + .to_owned(), |
| 33 | + } |
| 34 | +} |
| 35 | + |
| 36 | +pub struct CraneliftPassesCallbacks { |
| 37 | + use_clif: bool, |
| 38 | +} |
| 39 | + |
| 40 | +impl rustc_driver::Callbacks for CraneliftPassesCallbacks { |
| 41 | + fn config(&mut self, config: &mut interface::Config) { |
| 42 | + if !self.use_clif { |
| 43 | + config.opts.maybe_sysroot = Some(PathBuf::from(find_sysroot())); |
| 44 | + return; |
| 45 | + } |
| 46 | + |
| 47 | + // FIXME workaround for an ICE |
| 48 | + config.opts.debugging_opts.trim_diagnostic_paths = false; |
| 49 | + |
| 50 | + config.opts.cg.panic = Some(PanicStrategy::Abort); |
| 51 | + config.opts.debugging_opts.panic_abort_tests = true; |
| 52 | + config.opts.maybe_sysroot = Some( |
| 53 | + std::env::current_exe() |
| 54 | + .unwrap() |
| 55 | + .parent() |
| 56 | + .unwrap() |
| 57 | + .parent() |
| 58 | + .unwrap() |
| 59 | + .parent() |
| 60 | + .unwrap() |
| 61 | + .join("build_sysroot") |
| 62 | + .join("sysroot"), |
| 63 | + ); |
| 64 | + } |
| 65 | +} |
| 66 | + |
| 67 | +fn main() { |
| 68 | + rustc_driver::init_rustc_env_logger(); |
| 69 | + rustc_driver::install_ice_hook(); |
| 70 | + let exit_code = rustc_driver::catch_with_exit_code(|| { |
| 71 | + let mut use_clif = false; |
| 72 | + |
| 73 | + let args = std::env::args_os() |
| 74 | + .enumerate() |
| 75 | + .map(|(i, arg)| { |
| 76 | + arg.into_string().unwrap_or_else(|arg| { |
| 77 | + early_error( |
| 78 | + ErrorOutputType::default(), |
| 79 | + &format!("Argument {} is not valid Unicode: {:?}", i, arg), |
| 80 | + ) |
| 81 | + }) |
| 82 | + }) |
| 83 | + .filter(|arg| { |
| 84 | + if arg == "--clif" { |
| 85 | + use_clif = true; |
| 86 | + false |
| 87 | + } else { |
| 88 | + true |
| 89 | + } |
| 90 | + }) |
| 91 | + .collect::<Vec<_>>(); |
| 92 | + |
| 93 | + let mut callbacks = CraneliftPassesCallbacks { use_clif }; |
| 94 | + |
| 95 | + rustc_driver::run_compiler( |
| 96 | + &args, |
| 97 | + &mut callbacks, |
| 98 | + None, |
| 99 | + None, |
| 100 | + if use_clif { |
| 101 | + Some(Box::new(move |_| { |
| 102 | + Box::new(rustc_codegen_cranelift::CraneliftCodegenBackend { |
| 103 | + config: rustc_codegen_cranelift::BackendConfig { use_jit: false }, |
| 104 | + }) |
| 105 | + })) |
| 106 | + } else { |
| 107 | + None |
| 108 | + }, |
| 109 | + ) |
| 110 | + }); |
| 111 | + std::process::exit(exit_code) |
| 112 | +} |
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