ce99a5e5d8
Assert that the feature strings are NUL terminated, so that they will be well-formed as C strings. This is a safety check to ease the maintaninace and update of the feature lists.
63 lines
2.0 KiB
Rust
63 lines
2.0 KiB
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution and at
|
|
// http://rust-lang.org/COPYRIGHT.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
use syntax::{ast, attr};
|
|
use llvm::LLVMRustHasFeature;
|
|
use rustc::session::Session;
|
|
use rustc_trans::back::write::create_target_machine;
|
|
use syntax::parse::token::InternedString;
|
|
use syntax::parse::token::intern_and_get_ident as intern;
|
|
use libc::c_char;
|
|
|
|
// WARNING: the features must be known to LLVM or the feature
|
|
// detection code will walk past the end of the feature array,
|
|
// leading to crashes.
|
|
|
|
const ARM_WHITELIST: &'static [&'static str] = &[
|
|
"neon\0",
|
|
"vfp2\0",
|
|
"vfp3\0",
|
|
"vfp4\0",
|
|
];
|
|
|
|
const X86_WHITELIST: &'static [&'static str] = &[
|
|
"avx\0",
|
|
"avx2\0",
|
|
"sse\0",
|
|
"sse2\0",
|
|
"sse3\0",
|
|
"sse4.1\0",
|
|
"sse4.2\0",
|
|
"ssse3\0",
|
|
];
|
|
|
|
/// Add `target_feature = "..."` cfgs for a variety of platform
|
|
/// specific features (SSE, NEON etc.).
|
|
///
|
|
/// This is performed by checking whether a whitelisted set of
|
|
/// features is available on the target machine, by querying LLVM.
|
|
pub fn add_configuration(cfg: &mut ast::CrateConfig, sess: &Session) {
|
|
let target_machine = create_target_machine(sess);
|
|
|
|
let whitelist = match &*sess.target.target.arch {
|
|
"arm" => ARM_WHITELIST,
|
|
"x86" | "x86_64" => X86_WHITELIST,
|
|
_ => &[],
|
|
};
|
|
|
|
let tf = InternedString::new("target_feature");
|
|
for feat in whitelist {
|
|
assert_eq!(feat.chars().last(), Some('\0'));
|
|
if unsafe { LLVMRustHasFeature(target_machine, feat.as_ptr() as *const c_char) } {
|
|
cfg.push(attr::mk_name_value_item_str(tf.clone(), intern(&feat[..feat.len()-1])))
|
|
}
|
|
}
|
|
}
|