Only assume Stacked Borrows if -Zunsound-mir-opts is given
This commit is contained in:
Jannis Christopher Köhl
parent
111324e17c
commit
3c0f3b04b5
@ -1320,6 +1320,15 @@ impl PlaceContext {
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)
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}
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/// Returns `true` if this place context represents an address-of.
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pub fn is_address_of(&self) -> bool {
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matches!(
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self,
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PlaceContext::NonMutatingUse(NonMutatingUseContext::AddressOf)
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| PlaceContext::MutatingUse(MutatingUseContext::AddressOf)
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)
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}
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/// Returns `true` if this place context represents a storage live or storage dead marker.
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#[inline]
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pub fn is_storage_marker(&self) -> bool {
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@ -70,6 +70,7 @@ use std::fmt::{Debug, Formatter};
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use rustc_data_structures::fx::FxHashMap;
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use rustc_index::vec::IndexVec;
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use rustc_middle::mir::tcx::PlaceTy;
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use rustc_middle::mir::visit::{PlaceContext, Visitor};
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use rustc_middle::mir::*;
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use rustc_middle::ty::{self, Ty, TyCtxt};
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use rustc_span::DUMMY_SP;
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@ -567,7 +568,17 @@ impl Map {
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filter: impl FnMut(Ty<'tcx>) -> bool,
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) -> Self {
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let mut map = Self::new();
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map.register_with_filter(tcx, body, 3, filter);
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// If `-Zunsound-mir-opts` is given, tracking through references, and tracking of places
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// that have their reference taken is allowed. This would be "unsound" in the sense that
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// the correctness relies on an aliasing model similar to Stacked Borrows (which is
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// not yet guaranteed).
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if tcx.sess.opts.unstable_opts.unsound_mir_opts {
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map.register_with_filter(tcx, body, 3, filter, &[]);
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} else {
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map.register_with_filter(tcx, body, 0, filter, &escaped_places(body));
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}
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map
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}
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@ -577,6 +588,7 @@ impl Map {
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body: &Body<'tcx>,
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max_derefs: u32,
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mut filter: impl FnMut(Ty<'tcx>) -> bool,
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exclude: &[Place<'tcx>],
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) {
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let param_env = tcx.param_env_reveal_all_normalized(body.source.def_id());
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let mut projection = Vec::new();
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@ -589,6 +601,7 @@ impl Map {
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decl.ty,
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&mut filter,
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param_env,
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exclude,
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);
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}
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}
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@ -602,11 +615,18 @@ impl Map {
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ty: Ty<'tcx>,
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filter: &mut impl FnMut(Ty<'tcx>) -> bool,
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param_env: ty::ParamEnv<'tcx>,
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exclude: &[Place<'tcx>],
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) {
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// This check could be improved.
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if exclude.contains(&Place { local, projection: tcx.intern_place_elems(projection) }) {
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return;
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}
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if filter(ty) {
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// This might fail if `ty` is not scalar.
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let _ = self.register_with_ty(local, projection, ty);
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}
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if max_derefs > 0 {
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if let Some(ty::TypeAndMut { ty: deref_ty, .. }) = ty.builtin_deref(false) {
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// References can only be tracked if the target is `!Freeze`.
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@ -620,6 +640,7 @@ impl Map {
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deref_ty,
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filter,
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param_env,
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exclude,
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);
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projection.pop();
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}
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@ -632,7 +653,7 @@ impl Map {
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}
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projection.push(PlaceElem::Field(field, ty));
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self.register_with_filter_rec(
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tcx, max_derefs, local, projection, ty, filter, param_env,
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tcx, max_derefs, local, projection, ty, filter, param_env, exclude,
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);
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projection.pop();
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});
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@ -751,6 +772,25 @@ impl PlaceInfo {
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}
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}
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/// Returns all places, that have their reference or address taken.
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fn escaped_places<'tcx>(body: &Body<'tcx>) -> Vec<Place<'tcx>> {
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struct Collector<'tcx> {
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result: Vec<Place<'tcx>>,
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}
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impl<'tcx> Visitor<'tcx> for Collector<'tcx> {
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fn visit_place(&mut self, place: &Place<'tcx>, context: PlaceContext, _location: Location) {
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if context.is_borrow() || context.is_address_of() {
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self.result.push(*place);
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}
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}
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}
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let mut collector = Collector { result: Vec::new() };
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collector.visit_body(body);
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collector.result
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}
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struct Children<'a> {
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map: &'a Map,
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next: Option<PlaceIndex>,
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@ -1,4 +1,5 @@
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// unit-test: DataflowConstProp
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// compile-flags: -Zunsound-mir-opts
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// EMIT_MIR cast.main.DataflowConstProp.diff
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fn main() {
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@ -3,30 +3,30 @@
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fn main() -> () {
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let mut _0: (); // return place in scope 0 at $DIR/if.rs:+0:11: +0:11
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let _1: i32; // in scope 0 at $DIR/if.rs:+2:9: +2:10
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let mut _3: bool; // in scope 0 at $DIR/if.rs:+3:16: +3:24
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let mut _4: i32; // in scope 0 at $DIR/if.rs:+3:16: +3:19
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let mut _5: &i32; // in scope 0 at $DIR/if.rs:+3:17: +3:19
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let mut _7: i32; // in scope 0 at $DIR/if.rs:+4:13: +4:14
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let mut _9: bool; // in scope 0 at $DIR/if.rs:+6:16: +6:24
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let mut _10: i32; // in scope 0 at $DIR/if.rs:+6:16: +6:19
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let mut _11: &i32; // in scope 0 at $DIR/if.rs:+6:17: +6:19
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let mut _12: i32; // in scope 0 at $DIR/if.rs:+6:38: +6:39
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let mut _14: i32; // in scope 0 at $DIR/if.rs:+7:13: +7:14
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let _1: i32; // in scope 0 at $DIR/if.rs:+1:9: +1:10
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let mut _3: bool; // in scope 0 at $DIR/if.rs:+2:16: +2:24
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let mut _4: i32; // in scope 0 at $DIR/if.rs:+2:16: +2:19
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let mut _5: &i32; // in scope 0 at $DIR/if.rs:+2:17: +2:19
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let mut _7: i32; // in scope 0 at $DIR/if.rs:+3:13: +3:14
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let mut _9: bool; // in scope 0 at $DIR/if.rs:+5:16: +5:24
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let mut _10: i32; // in scope 0 at $DIR/if.rs:+5:16: +5:19
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let mut _11: &i32; // in scope 0 at $DIR/if.rs:+5:17: +5:19
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let mut _12: i32; // in scope 0 at $DIR/if.rs:+5:38: +5:39
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let mut _14: i32; // in scope 0 at $DIR/if.rs:+6:13: +6:14
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scope 1 {
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debug a => _1; // in scope 1 at $DIR/if.rs:+2:9: +2:10
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let _2: i32; // in scope 1 at $DIR/if.rs:+3:9: +3:10
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debug a => _1; // in scope 1 at $DIR/if.rs:+1:9: +1:10
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let _2: i32; // in scope 1 at $DIR/if.rs:+2:9: +2:10
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scope 2 {
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debug b => _2; // in scope 2 at $DIR/if.rs:+3:9: +3:10
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let _6: i32; // in scope 2 at $DIR/if.rs:+4:9: +4:10
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debug b => _2; // in scope 2 at $DIR/if.rs:+2:9: +2:10
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let _6: i32; // in scope 2 at $DIR/if.rs:+3:9: +3:10
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scope 3 {
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debug c => _6; // in scope 3 at $DIR/if.rs:+4:9: +4:10
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let _8: i32; // in scope 3 at $DIR/if.rs:+6:9: +6:10
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debug c => _6; // in scope 3 at $DIR/if.rs:+3:9: +3:10
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let _8: i32; // in scope 3 at $DIR/if.rs:+5:9: +5:10
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scope 4 {
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debug d => _8; // in scope 4 at $DIR/if.rs:+6:9: +6:10
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let _13: i32; // in scope 4 at $DIR/if.rs:+7:9: +7:10
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debug d => _8; // in scope 4 at $DIR/if.rs:+5:9: +5:10
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let _13: i32; // in scope 4 at $DIR/if.rs:+6:9: +6:10
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scope 5 {
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debug e => _13; // in scope 5 at $DIR/if.rs:+7:9: +7:10
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debug e => _13; // in scope 5 at $DIR/if.rs:+6:9: +6:10
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}
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}
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}
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@ -34,87 +34,87 @@
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}
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bb0: {
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StorageLive(_1); // scope 0 at $DIR/if.rs:+2:9: +2:10
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_1 = const 1_i32; // scope 0 at $DIR/if.rs:+2:13: +2:14
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StorageLive(_2); // scope 1 at $DIR/if.rs:+3:9: +3:10
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StorageLive(_3); // scope 1 at $DIR/if.rs:+3:16: +3:24
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StorageLive(_4); // scope 1 at $DIR/if.rs:+3:16: +3:19
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StorageLive(_5); // scope 1 at $DIR/if.rs:+3:17: +3:19
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_5 = &_1; // scope 1 at $DIR/if.rs:+3:17: +3:19
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- _4 = (*_5); // scope 1 at $DIR/if.rs:+3:16: +3:19
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- _3 = Eq(move _4, const 1_i32); // scope 1 at $DIR/if.rs:+3:16: +3:24
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+ _4 = const 1_i32; // scope 1 at $DIR/if.rs:+3:16: +3:19
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+ _3 = const true; // scope 1 at $DIR/if.rs:+3:16: +3:24
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StorageDead(_5); // scope 1 at $DIR/if.rs:+3:23: +3:24
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StorageDead(_4); // scope 1 at $DIR/if.rs:+3:23: +3:24
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- switchInt(move _3) -> [false: bb2, otherwise: bb1]; // scope 1 at $DIR/if.rs:+3:16: +3:24
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+ switchInt(const true) -> [false: bb2, otherwise: bb1]; // scope 1 at $DIR/if.rs:+3:16: +3:24
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StorageLive(_1); // scope 0 at $DIR/if.rs:+1:9: +1:10
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_1 = const 1_i32; // scope 0 at $DIR/if.rs:+1:13: +1:14
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StorageLive(_2); // scope 1 at $DIR/if.rs:+2:9: +2:10
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StorageLive(_3); // scope 1 at $DIR/if.rs:+2:16: +2:24
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StorageLive(_4); // scope 1 at $DIR/if.rs:+2:16: +2:19
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StorageLive(_5); // scope 1 at $DIR/if.rs:+2:17: +2:19
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_5 = &_1; // scope 1 at $DIR/if.rs:+2:17: +2:19
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- _4 = (*_5); // scope 1 at $DIR/if.rs:+2:16: +2:19
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- _3 = Eq(move _4, const 1_i32); // scope 1 at $DIR/if.rs:+2:16: +2:24
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+ _4 = const 1_i32; // scope 1 at $DIR/if.rs:+2:16: +2:19
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+ _3 = const true; // scope 1 at $DIR/if.rs:+2:16: +2:24
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StorageDead(_5); // scope 1 at $DIR/if.rs:+2:23: +2:24
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StorageDead(_4); // scope 1 at $DIR/if.rs:+2:23: +2:24
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- switchInt(move _3) -> [false: bb2, otherwise: bb1]; // scope 1 at $DIR/if.rs:+2:16: +2:24
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+ switchInt(const true) -> [false: bb2, otherwise: bb1]; // scope 1 at $DIR/if.rs:+2:16: +2:24
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}
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bb1: {
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_2 = const 2_i32; // scope 1 at $DIR/if.rs:+3:27: +3:28
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goto -> bb3; // scope 1 at $DIR/if.rs:+3:13: +3:41
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_2 = const 2_i32; // scope 1 at $DIR/if.rs:+2:27: +2:28
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goto -> bb3; // scope 1 at $DIR/if.rs:+2:13: +2:41
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}
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bb2: {
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_2 = const 3_i32; // scope 1 at $DIR/if.rs:+3:38: +3:39
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goto -> bb3; // scope 1 at $DIR/if.rs:+3:13: +3:41
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_2 = const 3_i32; // scope 1 at $DIR/if.rs:+2:38: +2:39
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goto -> bb3; // scope 1 at $DIR/if.rs:+2:13: +2:41
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}
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bb3: {
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StorageDead(_3); // scope 1 at $DIR/if.rs:+3:40: +3:41
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StorageLive(_6); // scope 2 at $DIR/if.rs:+4:9: +4:10
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StorageLive(_7); // scope 2 at $DIR/if.rs:+4:13: +4:14
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- _7 = _2; // scope 2 at $DIR/if.rs:+4:13: +4:14
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- _6 = Add(move _7, const 1_i32); // scope 2 at $DIR/if.rs:+4:13: +4:18
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+ _7 = const 2_i32; // scope 2 at $DIR/if.rs:+4:13: +4:14
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+ _6 = const 3_i32; // scope 2 at $DIR/if.rs:+4:13: +4:18
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StorageDead(_7); // scope 2 at $DIR/if.rs:+4:17: +4:18
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StorageLive(_8); // scope 3 at $DIR/if.rs:+6:9: +6:10
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StorageLive(_9); // scope 3 at $DIR/if.rs:+6:16: +6:24
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StorageLive(_10); // scope 3 at $DIR/if.rs:+6:16: +6:19
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StorageLive(_11); // scope 3 at $DIR/if.rs:+6:17: +6:19
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_11 = &_1; // scope 3 at $DIR/if.rs:+6:17: +6:19
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- _10 = (*_11); // scope 3 at $DIR/if.rs:+6:16: +6:19
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- _9 = Eq(move _10, const 1_i32); // scope 3 at $DIR/if.rs:+6:16: +6:24
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+ _10 = const 1_i32; // scope 3 at $DIR/if.rs:+6:16: +6:19
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+ _9 = const true; // scope 3 at $DIR/if.rs:+6:16: +6:24
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StorageDead(_11); // scope 3 at $DIR/if.rs:+6:23: +6:24
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StorageDead(_10); // scope 3 at $DIR/if.rs:+6:23: +6:24
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- switchInt(move _9) -> [false: bb5, otherwise: bb4]; // scope 3 at $DIR/if.rs:+6:16: +6:24
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+ switchInt(const true) -> [false: bb5, otherwise: bb4]; // scope 3 at $DIR/if.rs:+6:16: +6:24
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StorageDead(_3); // scope 1 at $DIR/if.rs:+2:40: +2:41
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StorageLive(_6); // scope 2 at $DIR/if.rs:+3:9: +3:10
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StorageLive(_7); // scope 2 at $DIR/if.rs:+3:13: +3:14
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- _7 = _2; // scope 2 at $DIR/if.rs:+3:13: +3:14
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- _6 = Add(move _7, const 1_i32); // scope 2 at $DIR/if.rs:+3:13: +3:18
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+ _7 = const 2_i32; // scope 2 at $DIR/if.rs:+3:13: +3:14
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+ _6 = const 3_i32; // scope 2 at $DIR/if.rs:+3:13: +3:18
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StorageDead(_7); // scope 2 at $DIR/if.rs:+3:17: +3:18
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StorageLive(_8); // scope 3 at $DIR/if.rs:+5:9: +5:10
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StorageLive(_9); // scope 3 at $DIR/if.rs:+5:16: +5:24
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StorageLive(_10); // scope 3 at $DIR/if.rs:+5:16: +5:19
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StorageLive(_11); // scope 3 at $DIR/if.rs:+5:17: +5:19
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_11 = &_1; // scope 3 at $DIR/if.rs:+5:17: +5:19
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- _10 = (*_11); // scope 3 at $DIR/if.rs:+5:16: +5:19
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- _9 = Eq(move _10, const 1_i32); // scope 3 at $DIR/if.rs:+5:16: +5:24
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+ _10 = const 1_i32; // scope 3 at $DIR/if.rs:+5:16: +5:19
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+ _9 = const true; // scope 3 at $DIR/if.rs:+5:16: +5:24
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StorageDead(_11); // scope 3 at $DIR/if.rs:+5:23: +5:24
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StorageDead(_10); // scope 3 at $DIR/if.rs:+5:23: +5:24
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- switchInt(move _9) -> [false: bb5, otherwise: bb4]; // scope 3 at $DIR/if.rs:+5:16: +5:24
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+ switchInt(const true) -> [false: bb5, otherwise: bb4]; // scope 3 at $DIR/if.rs:+5:16: +5:24
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}
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bb4: {
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- _8 = _1; // scope 3 at $DIR/if.rs:+6:27: +6:28
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+ _8 = const 1_i32; // scope 3 at $DIR/if.rs:+6:27: +6:28
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goto -> bb6; // scope 3 at $DIR/if.rs:+6:13: +6:45
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- _8 = _1; // scope 3 at $DIR/if.rs:+5:27: +5:28
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+ _8 = const 1_i32; // scope 3 at $DIR/if.rs:+5:27: +5:28
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goto -> bb6; // scope 3 at $DIR/if.rs:+5:13: +5:45
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}
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bb5: {
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StorageLive(_12); // scope 3 at $DIR/if.rs:+6:38: +6:39
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_12 = _1; // scope 3 at $DIR/if.rs:+6:38: +6:39
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_8 = Add(move _12, const 1_i32); // scope 3 at $DIR/if.rs:+6:38: +6:43
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StorageDead(_12); // scope 3 at $DIR/if.rs:+6:42: +6:43
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goto -> bb6; // scope 3 at $DIR/if.rs:+6:13: +6:45
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StorageLive(_12); // scope 3 at $DIR/if.rs:+5:38: +5:39
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_12 = _1; // scope 3 at $DIR/if.rs:+5:38: +5:39
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_8 = Add(move _12, const 1_i32); // scope 3 at $DIR/if.rs:+5:38: +5:43
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StorageDead(_12); // scope 3 at $DIR/if.rs:+5:42: +5:43
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goto -> bb6; // scope 3 at $DIR/if.rs:+5:13: +5:45
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}
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bb6: {
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StorageDead(_9); // scope 3 at $DIR/if.rs:+6:44: +6:45
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StorageLive(_13); // scope 4 at $DIR/if.rs:+7:9: +7:10
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StorageLive(_14); // scope 4 at $DIR/if.rs:+7:13: +7:14
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- _14 = _8; // scope 4 at $DIR/if.rs:+7:13: +7:14
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- _13 = Add(move _14, const 1_i32); // scope 4 at $DIR/if.rs:+7:13: +7:18
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+ _14 = const 1_i32; // scope 4 at $DIR/if.rs:+7:13: +7:14
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+ _13 = const 2_i32; // scope 4 at $DIR/if.rs:+7:13: +7:18
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StorageDead(_14); // scope 4 at $DIR/if.rs:+7:17: +7:18
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_0 = const (); // scope 0 at $DIR/if.rs:+0:11: +8:2
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StorageDead(_13); // scope 4 at $DIR/if.rs:+8:1: +8:2
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StorageDead(_8); // scope 3 at $DIR/if.rs:+8:1: +8:2
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StorageDead(_6); // scope 2 at $DIR/if.rs:+8:1: +8:2
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StorageDead(_2); // scope 1 at $DIR/if.rs:+8:1: +8:2
|
||||
StorageDead(_1); // scope 0 at $DIR/if.rs:+8:1: +8:2
|
||||
return; // scope 0 at $DIR/if.rs:+8:2: +8:2
|
||||
StorageDead(_9); // scope 3 at $DIR/if.rs:+5:44: +5:45
|
||||
StorageLive(_13); // scope 4 at $DIR/if.rs:+6:9: +6:10
|
||||
StorageLive(_14); // scope 4 at $DIR/if.rs:+6:13: +6:14
|
||||
- _14 = _8; // scope 4 at $DIR/if.rs:+6:13: +6:14
|
||||
- _13 = Add(move _14, const 1_i32); // scope 4 at $DIR/if.rs:+6:13: +6:18
|
||||
+ _14 = const 1_i32; // scope 4 at $DIR/if.rs:+6:13: +6:14
|
||||
+ _13 = const 2_i32; // scope 4 at $DIR/if.rs:+6:13: +6:18
|
||||
StorageDead(_14); // scope 4 at $DIR/if.rs:+6:17: +6:18
|
||||
_0 = const (); // scope 0 at $DIR/if.rs:+0:11: +7:2
|
||||
StorageDead(_13); // scope 4 at $DIR/if.rs:+7:1: +7:2
|
||||
StorageDead(_8); // scope 3 at $DIR/if.rs:+7:1: +7:2
|
||||
StorageDead(_6); // scope 2 at $DIR/if.rs:+7:1: +7:2
|
||||
StorageDead(_2); // scope 1 at $DIR/if.rs:+7:1: +7:2
|
||||
StorageDead(_1); // scope 0 at $DIR/if.rs:+7:1: +7:2
|
||||
return; // scope 0 at $DIR/if.rs:+7:2: +7:2
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
@ -1,8 +1,8 @@
|
||||
// unit-test: DataflowConstProp
|
||||
// compile-flags: -Zunsound-mir-opts
|
||||
|
||||
// EMIT_MIR if.main.DataflowConstProp.diff
|
||||
fn main() {
|
||||
// This does not work (yet). Needs perhaps additional state to track unreachability.
|
||||
let a = 1;
|
||||
let b = if *&a == 1 { 2 } else { 3 };
|
||||
let c = b + 1;
|
||||
|
||||
@ -37,7 +37,7 @@
|
||||
StorageLive(_6); // scope 2 at $DIR/ref.rs:+3:16: +3:34
|
||||
_6 = id() -> bb1; // scope 2 at $DIR/ref.rs:+3:16: +3:34
|
||||
// mir::Constant
|
||||
// + span: $DIR/ref.rs:7:16: 7:32
|
||||
// + span: $DIR/ref.rs:8:16: 8:32
|
||||
// + literal: Const { ty: fn() -> u32 {id}, val: Value(<ZST>) }
|
||||
}
|
||||
|
||||
|
||||
@ -1,4 +1,5 @@
|
||||
// unit-test: DataflowConstProp
|
||||
// compile-flags: -Zunsound-mir-opts
|
||||
|
||||
// EMIT_MIR ref.main.DataflowConstProp.diff
|
||||
fn main() {
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user