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Treat drop_in_place as nounwind with -Z panic-in-drop=abort

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The AbortUnwindCalls MIR pass will eliminate any unnecessary cleanups
and will prevent any unwinds from leaking out by forcing an abort.
This commit is contained in:
Amanieu d'Antras 2021-09-06 12:59:52 +02:00
parent c1bcf5c548
commit 8c7a05a23f
2 changed files with 14 additions and 5 deletions
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10
compiler/rustc_mir_transform/src/abort_unwinding_calls.rs
View File

@ -5,6 +5,7 @@ use rustc_middle::mir::*;
use rustc_middle::ty::layout;
use rustc_middle::ty::{self, TyCtxt};
use rustc_target::spec::abi::Abi;
use rustc_target::spec::PanicStrategy;
/// A pass that runs which is targeted at ensuring that codegen guarantees about
/// unwinding are upheld for compilations of panic=abort programs.
@ -82,10 +83,11 @@ impl<'tcx> MirPass<'tcx> for AbortUnwindingCalls {
};
layout::fn_can_unwind(tcx, flags, sig.abi())
}
TerminatorKind::Drop { .. }
| TerminatorKind::DropAndReplace { .. }
| TerminatorKind::Assert { .. }
| TerminatorKind::FalseUnwind { .. } => {
TerminatorKind::Drop { .. } | TerminatorKind::DropAndReplace { .. } => {
tcx.sess.opts.debugging_opts.panic_in_drop == PanicStrategy::Unwind
&& layout::fn_can_unwind(tcx, CodegenFnAttrFlags::empty(), Abi::Rust)
}
TerminatorKind::Assert { .. } | TerminatorKind::FalseUnwind { .. } => {
layout::fn_can_unwind(tcx, CodegenFnAttrFlags::empty(), Abi::Rust)
}
_ => continue,

9
compiler/rustc_typeck/src/collect.rs
View File

@ -46,7 +46,7 @@ use rustc_session::lint;
use rustc_session::parse::feature_err;
use rustc_span::symbol::{kw, sym, Ident, Symbol};
use rustc_span::{Span, DUMMY_SP};
use rustc_target::spec::{abi, SanitizerSet};
use rustc_target::spec::{abi, PanicStrategy, SanitizerSet};
use rustc_trait_selection::traits::error_reporting::suggestions::NextTypeParamName;
use std::iter;
@ -2683,6 +2683,13 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, id: DefId) -> CodegenFnAttrs {
codegen_fn_attrs.flags |= CodegenFnAttrFlags::TRACK_CALLER;
}
// With -Z panic-in-drop=abort, drop_in_place never unwinds.
if tcx.sess.opts.debugging_opts.panic_in_drop == PanicStrategy::Abort {
if Some(id) == tcx.lang_items().drop_in_place_fn() {
codegen_fn_attrs.flags |= CodegenFnAttrFlags::NEVER_UNWIND;
}
}
let supported_target_features = tcx.supported_target_features(LOCAL_CRATE);
let mut inline_span = None;