diff options
Diffstat (limited to 'compiler/rustc_codegen_gcc/src/gcc_util.rs')
| -rw-r--r-- | compiler/rustc_codegen_gcc/src/gcc_util.rs | 123 |
1 files changed, 23 insertions, 100 deletions
diff --git a/compiler/rustc_codegen_gcc/src/gcc_util.rs b/compiler/rustc_codegen_gcc/src/gcc_util.rs index 2e00d5fcb61..42ba40692b7 100644 --- a/compiler/rustc_codegen_gcc/src/gcc_util.rs +++ b/compiler/rustc_codegen_gcc/src/gcc_util.rs @@ -1,20 +1,12 @@ #[cfg(feature = "master")] use gccjit::Context; -use rustc_codegen_ssa::codegen_attrs::check_tied_features; -use rustc_codegen_ssa::errors::TargetFeatureDisableOrEnable; -use rustc_data_structures::fx::FxHashMap; -use rustc_data_structures::unord::UnordSet; +use rustc_codegen_ssa::target_features; use rustc_session::Session; -use rustc_session::features::{StabilityExt, retpoline_features_by_flags}; -use rustc_target::target_features::RUSTC_SPECIFIC_FEATURES; use smallvec::{SmallVec, smallvec}; -use crate::errors::{PossibleFeature, UnknownCTargetFeature, UnknownCTargetFeaturePrefix}; - -fn gcc_features_by_flags(sess: &Session) -> Vec<&str> { - let mut features: Vec<&str> = Vec::new(); - retpoline_features_by_flags(sess, &mut features); - features +fn gcc_features_by_flags(sess: &Session, features: &mut Vec<String>) { + target_features::retpoline_features_by_flags(sess, features); + // FIXME: LLVM also sets +reserve-x18 here under some conditions. } /// The list of GCC features computed from CLI flags (`-Ctarget-cpu`, `-Ctarget-feature`, @@ -44,98 +36,29 @@ pub(crate) fn global_gcc_features(sess: &Session, diagnostics: bool) -> Vec<Stri features.extend(sess.target.features.split(',').filter(|v| !v.is_empty()).map(String::from)); // -Ctarget-features - let known_features = sess.target.rust_target_features(); - let mut featsmap = FxHashMap::default(); - - // Compute implied features - let mut all_rust_features = vec![]; - for feature in sess.opts.cg.target_feature.split(',').chain(gcc_features_by_flags(sess)) { - if let Some(feature) = feature.strip_prefix('+') { - all_rust_features.extend( - UnordSet::from(sess.target.implied_target_features(feature)) - .to_sorted_stable_ord() - .iter() - .map(|&&s| (true, s)), - ) - } else if let Some(feature) = feature.strip_prefix('-') { - // FIXME: Why do we not remove implied features on "-" here? - // We do the equivalent above in `target_config`. - // See <https://github.com/rust-lang/rust/issues/134792>. - all_rust_features.push((false, feature)); - } else if !feature.is_empty() && diagnostics { - sess.dcx().emit_warn(UnknownCTargetFeaturePrefix { feature }); - } - } - // Remove features that are meant for rustc, not codegen. - all_rust_features.retain(|&(_, feature)| { - // Retain if it is not a rustc feature - !RUSTC_SPECIFIC_FEATURES.contains(&feature) - }); - - // Check feature validity. - if diagnostics { - for &(enable, feature) in &all_rust_features { - let feature_state = known_features.iter().find(|&&(v, _, _)| v == feature); - match feature_state { - None => { - let rust_feature = known_features.iter().find_map(|&(rust_feature, _, _)| { - let gcc_features = to_gcc_features(sess, rust_feature); - if gcc_features.contains(&feature) && !gcc_features.contains(&rust_feature) - { - Some(rust_feature) - } else { - None - } - }); - let unknown_feature = if let Some(rust_feature) = rust_feature { - UnknownCTargetFeature { - feature, - rust_feature: PossibleFeature::Some { rust_feature }, - } - } else { - UnknownCTargetFeature { feature, rust_feature: PossibleFeature::None } - }; - sess.dcx().emit_warn(unknown_feature); - } - Some(&(_, stability, _)) => { - stability.verify_feature_enabled_by_flag(sess, enable, feature); - } - } - - // FIXME(nagisa): figure out how to not allocate a full hashset here. - featsmap.insert(feature, enable); - } - } - - // Translate this into GCC features. - let feats = - all_rust_features.iter().flat_map(|&(enable, feature)| { - let enable_disable = if enable { '+' } else { '-' }; + target_features::flag_to_backend_features( + sess, + diagnostics, + |feature| to_gcc_features(sess, feature), + |feature, enable| { // We run through `to_gcc_features` when // passing requests down to GCC. This means that all in-language // features also work on the command line instead of having two // different names when the GCC name and the Rust name differ. - to_gcc_features(sess, feature) - .iter() - .flat_map(|feat| to_gcc_features(sess, feat).into_iter()) - .map(|feature| { - if enable_disable == '-' { - format!("-{}", feature) - } else { - feature.to_string() - } - }) - .collect::<Vec<_>>() - }); - features.extend(feats); - - if diagnostics && let Some(f) = check_tied_features(sess, &featsmap) { - sess.dcx().emit_err(TargetFeatureDisableOrEnable { - features: f, - span: None, - missing_features: None, - }); - } + features.extend( + to_gcc_features(sess, feature) + .iter() + .flat_map(|feat| to_gcc_features(sess, feat).into_iter()) + .map( + |feature| { + if !enable { format!("-{}", feature) } else { feature.to_string() } + }, + ), + ); + }, + ); + + gcc_features_by_flags(sess, &mut features); features } |