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Whitelist pclmulqdq x86 feature flag #48126

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merged 6 commits into from
Feb 15, 2018
Merged

Whitelist pclmulqdq x86 feature flag #48126

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14f488e
Whitelist pclmul x86 feature flag
newpavlov Feb 10, 2018
877272b
typo fix
newpavlov Feb 10, 2018
8be3068
added conversion from Rust feature to LLVM feature
newpavlov Feb 10, 2018
c97aa09
iterator instead loop
newpavlov Feb 10, 2018
7c6adb4
fixed errors
newpavlov Feb 11, 2018
c2a31de
Dangling pointer fix
newpavlov Feb 11, 2018
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5 changes: 3 additions & 2 deletions src/librustc_trans/attributes.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -142,7 +142,7 @@ pub fn provide(providers: &mut Providers) {
assert_eq!(cnum, LOCAL_CRATE);
Rc::new(llvm_util::target_feature_whitelist(tcx.sess)
.iter()
.map(|c| c.to_str().unwrap().to_string())
.map(|c| c.to_string())
.collect())
};

Expand Down Expand Up @@ -212,7 +212,8 @@ fn from_target_feature(
let value = value.as_str();
for feature in value.split(',') {
if whitelist.contains(feature) {
target_features.push(format!("+{}", feature));
let llvm_feature = llvm_util::to_llvm_feature(feature);
target_features.push(format!("+{}", llvm_feature));
continue
}

Expand Down
74 changes: 39 additions & 35 deletions src/librustc_trans/llvm_util.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,7 @@ use llvm;
use rustc::session::Session;
use rustc::session::config::PrintRequest;
use libc::c_int;
use std::ffi::{CStr, CString};
use std::ffi::CString;

use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::Once;
Expand Down Expand Up @@ -79,57 +79,61 @@ unsafe fn configure_llvm(sess: &Session) {
// detection code will walk past the end of the feature array,
// leading to crashes.

const ARM_WHITELIST: &'static [&'static str] = &["neon\0", "v7\0", "vfp2\0", "vfp3\0", "vfp4\0"];
const ARM_WHITELIST: &'static [&'static str] = &["neon", "v7", "vfp2", "vfp3", "vfp4"];

const AARCH64_WHITELIST: &'static [&'static str] = &["neon\0", "v7\0"];
const AARCH64_WHITELIST: &'static [&'static str] = &["neon", "v7"];

const X86_WHITELIST: &'static [&'static str] = &["avx\0", "avx2\0", "bmi\0", "bmi2\0", "sse\0",
"sse2\0", "sse3\0", "sse4.1\0", "sse4.2\0",
"ssse3\0", "tbm\0", "lzcnt\0", "popcnt\0",
"sse4a\0", "rdrnd\0", "rdseed\0", "fma\0",
"xsave\0", "xsaveopt\0", "xsavec\0",
"xsaves\0", "aes\0",
"avx512bw\0", "avx512cd\0",
"avx512dq\0", "avx512er\0",
"avx512f\0", "avx512ifma\0",
"avx512pf\0", "avx512vbmi\0",
"avx512vl\0", "avx512vpopcntdq\0",
"mmx\0", "fxsr\0"];
const X86_WHITELIST: &'static [&'static str] = &["avx", "avx2", "bmi", "bmi2", "sse",
"sse2", "sse3", "sse4.1", "sse4.2",
"ssse3", "tbm", "lzcnt", "popcnt",
"sse4a", "rdrnd", "rdseed", "fma",
"xsave", "xsaveopt", "xsavec",
"xsaves", "aes", "pclmulqdq",
"avx512bw", "avx512cd",
"avx512dq", "avx512er",
"avx512f", "avx512ifma",
"avx512pf", "avx512vbmi",
"avx512vl", "avx512vpopcntdq",
"mmx", "fxsr"];

const HEXAGON_WHITELIST: &'static [&'static str] = &["hvx\0", "hvx-double\0"];
const HEXAGON_WHITELIST: &'static [&'static str] = &["hvx", "hvx-double"];

const POWERPC_WHITELIST: &'static [&'static str] = &["altivec\0",
"power8-altivec\0", "power9-altivec\0",
"power8-vector\0", "power9-vector\0",
"vsx\0"];
const POWERPC_WHITELIST: &'static [&'static str] = &["altivec",
"power8-altivec", "power9-altivec",
"power8-vector", "power9-vector",
"vsx"];

const MIPS_WHITELIST: &'static [&'static str] = &["msa\0"];
const MIPS_WHITELIST: &'static [&'static str] = &["msa"];

pub fn to_llvm_feature(s: &str) -> &str {
match s {
"pclmulqdq" => "pclmul",
s => s,
}
}

pub fn target_features(sess: &Session) -> Vec<Symbol> {
let whitelist = target_feature_whitelist(sess);
let target_machine = create_target_machine(sess);
let mut features = Vec::new();
for feat in whitelist {
if unsafe { llvm::LLVMRustHasFeature(target_machine, feat.as_ptr()) } {
features.push(Symbol::intern(feat.to_str().unwrap()));
}
}
features
target_feature_whitelist(sess)
.iter()
.filter(|feature| {
let llvm_feature = to_llvm_feature(feature);
let ptr = CString::new(llvm_feature).unwrap().as_ptr();
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This is a dangling pointer. See temporary_cstring_as_ptr.

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Yes, thank you for noticing!

unsafe { llvm::LLVMRustHasFeature(target_machine, ptr) }
})
.map(|feature| Symbol::intern(feature)).collect()
}

pub fn target_feature_whitelist(sess: &Session) -> Vec<&CStr> {
let whitelist = match &*sess.target.target.arch {
pub fn target_feature_whitelist(sess: &Session) -> &'static [&'static str] {
match &*sess.target.target.arch {
"arm" => ARM_WHITELIST,
"aarch64" => AARCH64_WHITELIST,
"x86" | "x86_64" => X86_WHITELIST,
"hexagon" => HEXAGON_WHITELIST,
"mips" | "mips64" => MIPS_WHITELIST,
"powerpc" | "powerpc64" => POWERPC_WHITELIST,
_ => &[],
};
whitelist.iter().map(|m| {
CStr::from_bytes_with_nul(m.as_bytes()).unwrap()
}).collect()
}
}

pub fn print_version() {
Expand Down