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/// Configuration of cg_clif as passed in through `-Cllvm-args` and various env vars.
#[derive(Clone, Debug)]
pub struct BackendConfig {
/// Should the crate be AOT compiled or JIT executed.
///
/// Defaults to AOT compilation. Can be set using `-Cllvm-args=jit-mode`.
pub jit_mode: bool,
/// When JIT mode is enable pass these arguments to the program.
///
/// Defaults to the value of `CG_CLIF_JIT_ARGS`.
pub jit_args: Vec<String>,
}
impl BackendConfig {
/// Parse the configuration passed in using `-Cllvm-args`.
pub fn from_opts(opts: &[String]) -> Result<Self, String> {
let mut config = BackendConfig {
jit_mode: false,
jit_args: match std::env::var("CG_CLIF_JIT_ARGS") {
Ok(args) => args.split(' ').map(|arg| arg.to_string()).collect(),
Err(std::env::VarError::NotPresent) => vec![],
Err(std::env::VarError::NotUnicode(s)) => {
panic!("CG_CLIF_JIT_ARGS not unicode: {:?}", s);
}
},
};
for opt in opts {
if opt.starts_with("-import-instr-limit") {
// Silently ignore -import-instr-limit. It is set by rust's build system even when
// testing cg_clif.
continue;
}
match &**opt {
"jit-mode" => config.jit_mode = true,
_ => return Err(format!("Unknown option `{}`", opt)),
}
}
Ok(config)
}
}
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