compiler/rustc_mir_transform/src/elaborate_drops.rs

   1 use crate::deref_separator::deref_finder;
   2 use crate::MirPass;
   3 use rustc_data_structures::fx::FxHashMap;
   4 use rustc_index::bit_set::BitSet;
   5 use rustc_middle::mir::patch::MirPatch;
   6 use rustc_middle::mir::*;
   7 use rustc_middle::ty::{self, TyCtxt};
   8 use rustc_mir_dataflow::elaborate_drops::{elaborate_drop, DropFlagState, Unwind};
   9 use rustc_mir_dataflow::elaborate_drops::{DropElaborator, DropFlagMode, DropStyle};
  10 use rustc_mir_dataflow::impls::{MaybeInitializedPlaces, MaybeUninitializedPlaces};
  11 use rustc_mir_dataflow::move_paths::{LookupResult, MoveData, MovePathIndex};
  12 use rustc_mir_dataflow::on_lookup_result_bits;
  13 use rustc_mir_dataflow::un_derefer::UnDerefer;
  14 use rustc_mir_dataflow::MoveDataParamEnv;
  15 use rustc_mir_dataflow::{on_all_children_bits, on_all_drop_children_bits};
  16 use rustc_mir_dataflow::{Analysis, ResultsCursor};
  17 use rustc_span::Span;
  18 use rustc_target::abi::VariantIdx;
  19 use std::fmt;
  20
  21 pub struct ElaborateDrops;
  22
  23 impl<'tcx> MirPass<'tcx> for ElaborateDrops {
  24     fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
  25         debug!("elaborate_drops({:?} @ {:?})", body.source, body.span);
  26
  27         let def_id = body.source.def_id();
  28         let param_env = tcx.param_env_reveal_all_normalized(def_id);
  29         let (side_table, move_data) = match MoveData::gather_moves(body, tcx, param_env) {
  30             Ok(move_data) => move_data,
  31             Err((move_data, _)) => {
  32                 tcx.sess.delay_span_bug(
  33                     body.span,
  34                     "No `move_errors` should be allowed in MIR borrowck",
  35                 );
  36                 (Default::default(), move_data)
  37             }
  38         };
  39         let un_derefer = UnDerefer { tcx: tcx, derefer_sidetable: side_table };
  40         let elaborate_patch = {
  41             let body = &*body;
  42             let env = MoveDataParamEnv { move_data, param_env };
  43             let dead_unwinds = find_dead_unwinds(tcx, body, &env, &un_derefer);
  44
  45             let inits = MaybeInitializedPlaces::new(tcx, body, &env)
  46                 .into_engine(tcx, body)
  47                 .dead_unwinds(&dead_unwinds)
  48                 .pass_name("elaborate_drops")
  49                 .iterate_to_fixpoint()
  50                 .into_results_cursor(body);
  51
  52             let uninits = MaybeUninitializedPlaces::new(tcx, body, &env)
  53                 .mark_inactive_variants_as_uninit()
  54                 .into_engine(tcx, body)
  55                 .dead_unwinds(&dead_unwinds)
  56                 .pass_name("elaborate_drops")
  57                 .iterate_to_fixpoint()
  58                 .into_results_cursor(body);
  59
  60             ElaborateDropsCtxt {
  61                 tcx,
  62                 body,
  63                 env: &env,
  64                 init_data: InitializationData { inits, uninits },
  65                 drop_flags: Default::default(),
  66                 patch: MirPatch::new(body),
  67                 un_derefer: un_derefer,
  68             }
  69             .elaborate()
  70         };
  71         elaborate_patch.apply(body);
  72         deref_finder(tcx, body);
  73     }
  74 }
  75
  76 /// Returns the set of basic blocks whose unwind edges are known
  77 /// to not be reachable, because they are `drop` terminators
  78 /// that can't drop anything.
  79 fn find_dead_unwinds<'tcx>(
  80     tcx: TyCtxt<'tcx>,
  81     body: &Body<'tcx>,
  82     env: &MoveDataParamEnv<'tcx>,
  83     und: &UnDerefer<'tcx>,
  84 ) -> BitSet<BasicBlock> {
  85     debug!("find_dead_unwinds({:?})", body.span);
  86     // We only need to do this pass once, because unwind edges can only
  87     // reach cleanup blocks, which can't have unwind edges themselves.
  88     let mut dead_unwinds = BitSet::new_empty(body.basic_blocks.len());
  89     let mut flow_inits = MaybeInitializedPlaces::new(tcx, body, &env)
  90         .into_engine(tcx, body)
  91         .pass_name("find_dead_unwinds")
  92         .iterate_to_fixpoint()
  93         .into_results_cursor(body);
  94     for (bb, bb_data) in body.basic_blocks.iter_enumerated() {
  95         let place = match bb_data.terminator().kind {
  96             TerminatorKind::Drop { ref place, unwind: Some(_), .. }
  97             | TerminatorKind::DropAndReplace { ref place, unwind: Some(_), .. } => {
  98                 und.derefer(place.as_ref(), body).unwrap_or(*place)
  99             }
 100             _ => continue,
 101         };
 102
 103         debug!("find_dead_unwinds @ {:?}: {:?}", bb, bb_data);
 104
 105         let LookupResult::Exact(path) = env.move_data.rev_lookup.find(place.as_ref()) else {
 106             debug!("find_dead_unwinds: has parent; skipping");
 107             continue;
 108         };
 109
 110         flow_inits.seek_before_primary_effect(body.terminator_loc(bb));
 111         debug!(
 112             "find_dead_unwinds @ {:?}: path({:?})={:?}; init_data={:?}",
 113             bb,
 114             place,
 115             path,
 116             flow_inits.get()
 117         );
 118
 119         let mut maybe_live = false;
 120         on_all_drop_children_bits(tcx, body, &env, path, |child| {
 121             maybe_live |= flow_inits.contains(child);
 122         });
 123
 124         debug!("find_dead_unwinds @ {:?}: maybe_live={}", bb, maybe_live);
 125         if !maybe_live {
 126             dead_unwinds.insert(bb);
 127         }
 128     }
 129
 130     dead_unwinds
 131 }
 132
 133 struct InitializationData<'mir, 'tcx> {
 134     inits: ResultsCursor<'mir, 'tcx, MaybeInitializedPlaces<'mir, 'tcx>>,
 135     uninits: ResultsCursor<'mir, 'tcx, MaybeUninitializedPlaces<'mir, 'tcx>>,
 136 }
 137
 138 impl InitializationData<'_, '_> {
 139     fn seek_before(&mut self, loc: Location) {
 140         self.inits.seek_before_primary_effect(loc);
 141         self.uninits.seek_before_primary_effect(loc);
 142     }
 143
 144     fn maybe_live_dead(&self, path: MovePathIndex) -> (bool, bool) {
 145         (self.inits.contains(path), self.uninits.contains(path))
 146     }
 147 }
 148
 149 struct Elaborator<'a, 'b, 'tcx> {
 150     ctxt: &'a mut ElaborateDropsCtxt<'b, 'tcx>,
 151 }
 152
 153 impl fmt::Debug for Elaborator<'_, '_, '_> {
 154     fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
 155         Ok(())
 156     }
 157 }
 158
 159 impl<'a, 'tcx> DropElaborator<'a, 'tcx> for Elaborator<'a, '_, 'tcx> {
 160     type Path = MovePathIndex;
 161
 162     fn patch(&mut self) -> &mut MirPatch<'tcx> {
 163         &mut self.ctxt.patch
 164     }
 165
 166     fn body(&self) -> &'a Body<'tcx> {
 167         self.ctxt.body
 168     }
 169
 170     fn tcx(&self) -> TyCtxt<'tcx> {
 171         self.ctxt.tcx
 172     }
 173
 174     fn param_env(&self) -> ty::ParamEnv<'tcx> {
 175         self.ctxt.param_env()
 176     }
 177
 178     fn drop_style(&self, path: Self::Path, mode: DropFlagMode) -> DropStyle {
 179         let ((maybe_live, maybe_dead), multipart) = match mode {
 180             DropFlagMode::Shallow => (self.ctxt.init_data.maybe_live_dead(path), false),
 181             DropFlagMode::Deep => {
 182                 let mut some_live = false;
 183                 let mut some_dead = false;
 184                 let mut children_count = 0;
 185                 on_all_drop_children_bits(self.tcx(), self.body(), self.ctxt.env, path, |child| {
 186                     let (live, dead) = self.ctxt.init_data.maybe_live_dead(child);
 187                     debug!("elaborate_drop: state({:?}) = {:?}", child, (live, dead));
 188                     some_live |= live;
 189                     some_dead |= dead;
 190                     children_count += 1;
 191                 });
 192                 ((some_live, some_dead), children_count != 1)
 193             }
 194         };
 195         match (maybe_live, maybe_dead, multipart) {
 196             (false, _, _) => DropStyle::Dead,
 197             (true, false, _) => DropStyle::Static,
 198             (true, true, false) => DropStyle::Conditional,
 199             (true, true, true) => DropStyle::Open,
 200         }
 201     }
 202
 203     fn clear_drop_flag(&mut self, loc: Location, path: Self::Path, mode: DropFlagMode) {
 204         match mode {
 205             DropFlagMode::Shallow => {
 206                 self.ctxt.set_drop_flag(loc, path, DropFlagState::Absent);
 207             }
 208             DropFlagMode::Deep => {
 209                 on_all_children_bits(
 210                     self.tcx(),
 211                     self.body(),
 212                     self.ctxt.move_data(),
 213                     path,
 214                     |child| self.ctxt.set_drop_flag(loc, child, DropFlagState::Absent),
 215                 );
 216             }
 217         }
 218     }
 219
 220     fn field_subpath(&self, path: Self::Path, field: Field) -> Option<Self::Path> {
 221         rustc_mir_dataflow::move_path_children_matching(self.ctxt.move_data(), path, |e| match e {
 222             ProjectionElem::Field(idx, _) => idx == field,
 223             _ => false,
 224         })
 225     }
 226
 227     fn array_subpath(&self, path: Self::Path, index: u64, size: u64) -> Option<Self::Path> {
 228         rustc_mir_dataflow::move_path_children_matching(self.ctxt.move_data(), path, |e| match e {
 229             ProjectionElem::ConstantIndex { offset, min_length, from_end } => {
 230                 debug_assert!(size == min_length, "min_length should be exact for arrays");
 231                 assert!(!from_end, "from_end should not be used for array element ConstantIndex");
 232                 offset == index
 233             }
 234             _ => false,
 235         })
 236     }
 237
 238     fn deref_subpath(&self, path: Self::Path) -> Option<Self::Path> {
 239         rustc_mir_dataflow::move_path_children_matching(self.ctxt.move_data(), path, |e| {
 240             e == ProjectionElem::Deref
 241         })
 242     }
 243
 244     fn downcast_subpath(&self, path: Self::Path, variant: VariantIdx) -> Option<Self::Path> {
 245         rustc_mir_dataflow::move_path_children_matching(self.ctxt.move_data(), path, |e| match e {
 246             ProjectionElem::Downcast(_, idx) => idx == variant,
 247             _ => false,
 248         })
 249     }
 250
 251     fn get_drop_flag(&mut self, path: Self::Path) -> Option<Operand<'tcx>> {
 252         self.ctxt.drop_flag(path).map(Operand::Copy)
 253     }
 254 }
 255
 256 struct ElaborateDropsCtxt<'a, 'tcx> {
 257     tcx: TyCtxt<'tcx>,
 258     body: &'a Body<'tcx>,
 259     env: &'a MoveDataParamEnv<'tcx>,
 260     init_data: InitializationData<'a, 'tcx>,
 261     drop_flags: FxHashMap<MovePathIndex, Local>,
 262     patch: MirPatch<'tcx>,
 263     un_derefer: UnDerefer<'tcx>,
 264 }
 265
 266 impl<'b, 'tcx> ElaborateDropsCtxt<'b, 'tcx> {
 267     fn move_data(&self) -> &'b MoveData<'tcx> {
 268         &self.env.move_data
 269     }
 270
 271     fn param_env(&self) -> ty::ParamEnv<'tcx> {
 272         self.env.param_env
 273     }
 274
 275     fn create_drop_flag(&mut self, index: MovePathIndex, span: Span) {
 276         let tcx = self.tcx;
 277         let patch = &mut self.patch;
 278         debug!("create_drop_flag({:?})", self.body.span);
 279         self.drop_flags.entry(index).or_insert_with(|| patch.new_internal(tcx.types.bool, span));
 280     }
 281
 282     fn drop_flag(&mut self, index: MovePathIndex) -> Option<Place<'tcx>> {
 283         self.drop_flags.get(&index).map(|t| Place::from(*t))
 284     }
 285
 286     /// create a patch that elaborates all drops in the input
 287     /// MIR.
 288     fn elaborate(mut self) -> MirPatch<'tcx> {
 289         self.collect_drop_flags();
 290
 291         self.elaborate_drops();
 292
 293         self.drop_flags_on_init();
 294         self.drop_flags_for_fn_rets();
 295         self.drop_flags_for_args();
 296         self.drop_flags_for_locs();
 297
 298         self.patch
 299     }
 300
 301     fn collect_drop_flags(&mut self) {
 302         for (bb, data) in self.body.basic_blocks.iter_enumerated() {
 303             let terminator = data.terminator();
 304             let place = match terminator.kind {
 305                 TerminatorKind::Drop { ref place, .. }
 306                 | TerminatorKind::DropAndReplace { ref place, .. } => {
 307                     self.un_derefer.derefer(place.as_ref(), self.body).unwrap_or(*place)
 308                 }
 309                 _ => continue,
 310             };
 311
 312             self.init_data.seek_before(self.body.terminator_loc(bb));
 313
 314             let path = self.move_data().rev_lookup.find(place.as_ref());
 315             debug!("collect_drop_flags: {:?}, place {:?} ({:?})", bb, place, path);
 316
 317             let path = match path {
 318                 LookupResult::Exact(e) => e,
 319                 LookupResult::Parent(None) => continue,
 320                 LookupResult::Parent(Some(parent)) => {
 321                     let (_maybe_live, maybe_dead) = self.init_data.maybe_live_dead(parent);
 322
 323                     if self.body.local_decls[place.local].is_deref_temp() {
 324                         continue;
 325                     }
 326
 327                     if maybe_dead {
 328                         self.tcx.sess.delay_span_bug(
 329                             terminator.source_info.span,
 330                             &format!(
 331                                 "drop of untracked, uninitialized value {:?}, place {:?} ({:?})",
 332                                 bb, place, path
 333                             ),
 334                         );
 335                     }
 336                     continue;
 337                 }
 338             };
 339
 340             on_all_drop_children_bits(self.tcx, self.body, self.env, path, |child| {
 341                 let (maybe_live, maybe_dead) = self.init_data.maybe_live_dead(child);
 342                 debug!(
 343                     "collect_drop_flags: collecting {:?} from {:?}@{:?} - {:?}",
 344                     child,
 345                     place,
 346                     path,
 347                     (maybe_live, maybe_dead)
 348                 );
 349                 if maybe_live && maybe_dead {
 350                     self.create_drop_flag(child, terminator.source_info.span)
 351                 }
 352             });
 353         }
 354     }
 355
 356     fn elaborate_drops(&mut self) {
 357         for (bb, data) in self.body.basic_blocks.iter_enumerated() {
 358             let loc = Location { block: bb, statement_index: data.statements.len() };
 359             let terminator = data.terminator();
 360
 361             let resume_block = self.patch.resume_block();
 362             match terminator.kind {
 363                 TerminatorKind::Drop { mut place, target, unwind } => {
 364                     if let Some(new_place) = self.un_derefer.derefer(place.as_ref(), self.body) {
 365                         place = new_place;
 366                     }
 367
 368                     self.init_data.seek_before(loc);
 369                     match self.move_data().rev_lookup.find(place.as_ref()) {
 370                         LookupResult::Exact(path) => elaborate_drop(
 371                             &mut Elaborator { ctxt: self },
 372                             terminator.source_info,
 373                             place,
 374                             path,
 375                             target,
 376                             if data.is_cleanup {
 377                                 Unwind::InCleanup
 378                             } else {
 379                                 Unwind::To(Option::unwrap_or(unwind, resume_block))
 380                             },
 381                             bb,
 382                         ),
 383                         LookupResult::Parent(..) => {
 384                             self.tcx.sess.delay_span_bug(
 385                                 terminator.source_info.span,
 386                                 &format!("drop of untracked value {:?}", bb),
 387                             );
 388                         }
 389                     }
 390                 }
 391                 TerminatorKind::DropAndReplace { mut place, ref value, target, unwind } => {
 392                     assert!(!data.is_cleanup);
 393
 394                     if let Some(new_place) = self.un_derefer.derefer(place.as_ref(), self.body) {
 395                         place = new_place;
 396                     }
 397                     self.elaborate_replace(loc, place, value, target, unwind);
 398                 }
 399                 _ => continue,
 400             }
 401         }
 402     }
 403
 404     /// Elaborate a MIR `replace` terminator. This instruction
 405     /// is not directly handled by codegen, and therefore
 406     /// must be desugared.
 407     ///
 408     /// The desugaring drops the location if needed, and then writes
 409     /// the value (including setting the drop flag) over it in *both* arms.
 410     ///
 411     /// The `replace` terminator can also be called on places that
 412     /// are not tracked by elaboration (for example,
 413     /// `replace x[i] <- tmp0`). The borrow checker requires that
 414     /// these locations are initialized before the assignment,
 415     /// so we just generate an unconditional drop.
 416     fn elaborate_replace(
 417         &mut self,
 418         loc: Location,
 419         place: Place<'tcx>,
 420         value: &Operand<'tcx>,
 421         target: BasicBlock,
 422         unwind: Option<BasicBlock>,
 423     ) {
 424         let bb = loc.block;
 425         let data = &self.body[bb];
 426         let terminator = data.terminator();
 427         assert!(!data.is_cleanup, "DropAndReplace in unwind path not supported");
 428
 429         let assign = Statement {
 430             kind: StatementKind::Assign(Box::new((place, Rvalue::Use(value.clone())))),
 431             source_info: terminator.source_info,
 432         };
 433
 434         let unwind = unwind.unwrap_or_else(|| self.patch.resume_block());
 435         let unwind = self.patch.new_block(BasicBlockData {
 436             statements: vec![assign.clone()],
 437             terminator: Some(Terminator {
 438                 kind: TerminatorKind::Goto { target: unwind },
 439                 ..*terminator
 440             }),
 441             is_cleanup: true,
 442         });
 443
 444         let target = self.patch.new_block(BasicBlockData {
 445             statements: vec![assign],
 446             terminator: Some(Terminator { kind: TerminatorKind::Goto { target }, ..*terminator }),
 447             is_cleanup: false,
 448         });
 449
 450         match self.move_data().rev_lookup.find(place.as_ref()) {
 451             LookupResult::Exact(path) => {
 452                 debug!("elaborate_drop_and_replace({:?}) - tracked {:?}", terminator, path);
 453                 self.init_data.seek_before(loc);
 454                 elaborate_drop(
 455                     &mut Elaborator { ctxt: self },
 456                     terminator.source_info,
 457                     place,
 458                     path,
 459                     target,
 460                     Unwind::To(unwind),
 461                     bb,
 462                 );
 463                 on_all_children_bits(self.tcx, self.body, self.move_data(), path, |child| {
 464                     self.set_drop_flag(
 465                         Location { block: target, statement_index: 0 },
 466                         child,
 467                         DropFlagState::Present,
 468                     );
 469                     self.set_drop_flag(
 470                         Location { block: unwind, statement_index: 0 },
 471                         child,
 472                         DropFlagState::Present,
 473                     );
 474                 });
 475             }
 476             LookupResult::Parent(parent) => {
 477                 // drop and replace behind a pointer/array/whatever. The location
 478                 // must be initialized.
 479                 debug!("elaborate_drop_and_replace({:?}) - untracked {:?}", terminator, parent);
 480                 self.patch.patch_terminator(
 481                     bb,
 482                     TerminatorKind::Drop { place, target, unwind: Some(unwind) },
 483                 );
 484             }
 485         }
 486     }
 487
 488     fn constant_bool(&self, span: Span, val: bool) -> Rvalue<'tcx> {
 489         Rvalue::Use(Operand::Constant(Box::new(Constant {
 490             span,
 491             user_ty: None,
 492             literal: ConstantKind::from_bool(self.tcx, val),
 493         })))
 494     }
 495
 496     fn set_drop_flag(&mut self, loc: Location, path: MovePathIndex, val: DropFlagState) {
 497         if let Some(&flag) = self.drop_flags.get(&path) {
 498             let span = self.patch.source_info_for_location(self.body, loc).span;
 499             let val = self.constant_bool(span, val.value());
 500             self.patch.add_assign(loc, Place::from(flag), val);
 501         }
 502     }
 503
 504     fn drop_flags_on_init(&mut self) {
 505         let loc = Location::START;
 506         let span = self.patch.source_info_for_location(self.body, loc).span;
 507         let false_ = self.constant_bool(span, false);
 508         for flag in self.drop_flags.values() {
 509             self.patch.add_assign(loc, Place::from(*flag), false_.clone());
 510         }
 511     }
 512
 513     fn drop_flags_for_fn_rets(&mut self) {
 514         for (bb, data) in self.body.basic_blocks.iter_enumerated() {
 515             if let TerminatorKind::Call {
 516                 destination, target: Some(tgt), cleanup: Some(_), ..
 517             } = data.terminator().kind
 518             {
 519                 assert!(!self.patch.is_patched(bb));
 520
 521                 let loc = Location { block: tgt, statement_index: 0 };
 522                 let path = self.move_data().rev_lookup.find(destination.as_ref());
 523                 on_lookup_result_bits(self.tcx, self.body, self.move_data(), path, |child| {
 524                     self.set_drop_flag(loc, child, DropFlagState::Present)
 525                 });
 526             }
 527         }
 528     }
 529
 530     fn drop_flags_for_args(&mut self) {
 531         let loc = Location::START;
 532         rustc_mir_dataflow::drop_flag_effects_for_function_entry(
 533             self.tcx,
 534             self.body,
 535             self.env,
 536             |path, ds| {
 537                 self.set_drop_flag(loc, path, ds);
 538             },
 539         )
 540     }
 541
 542     fn drop_flags_for_locs(&mut self) {
 543         // We intentionally iterate only over the *old* basic blocks.
 544         //
 545         // Basic blocks created by drop elaboration update their
 546         // drop flags by themselves, to avoid the drop flags being
 547         // clobbered before they are read.
 548
 549         for (bb, data) in self.body.basic_blocks.iter_enumerated() {
 550             debug!("drop_flags_for_locs({:?})", data);
 551             for i in 0..(data.statements.len() + 1) {
 552                 debug!("drop_flag_for_locs: stmt {}", i);
 553                 let mut allow_initializations = true;
 554                 if i == data.statements.len() {
 555                     match data.terminator().kind {
 556                         TerminatorKind::Drop { .. } => {
 557                             // drop elaboration should handle that by itself
 558                             continue;
 559                         }
 560                         TerminatorKind::DropAndReplace { .. } => {
 561                             // this contains the move of the source and
 562                             // the initialization of the destination. We
 563                             // only want the former - the latter is handled
 564                             // by the elaboration code and must be done
 565                             // *after* the destination is dropped.
 566                             assert!(self.patch.is_patched(bb));
 567                             allow_initializations = false;
 568                         }
 569                         TerminatorKind::Resume => {
 570                             // It is possible for `Resume` to be patched
 571                             // (in particular it can be patched to be replaced with
 572                             // a Goto; see `MirPatch::new`).
 573                         }
 574                         _ => {
 575                             assert!(!self.patch.is_patched(bb));
 576                         }
 577                     }
 578                 }
 579                 let loc = Location { block: bb, statement_index: i };
 580                 rustc_mir_dataflow::drop_flag_effects_for_location(
 581                     self.tcx,
 582                     self.body,
 583                     self.env,
 584                     loc,
 585                     |path, ds| {
 586                         if ds == DropFlagState::Absent || allow_initializations {
 587                             self.set_drop_flag(loc, path, ds)
 588                         }
 589                     },
 590                 )
 591             }
 592
 593             // There may be a critical edge after this call,
 594             // so mark the return as initialized *before* the
 595             // call.
 596             if let TerminatorKind::Call { destination, target: Some(_), cleanup: None, .. } =
 597                 data.terminator().kind
 598             {
 599                 assert!(!self.patch.is_patched(bb));
 600
 601                 let loc = Location { block: bb, statement_index: data.statements.len() };
 602                 let path = self.move_data().rev_lookup.find(destination.as_ref());
 603                 on_lookup_result_bits(self.tcx, self.body, self.move_data(), path, |child| {
 604                     self.set_drop_flag(loc, child, DropFlagState::Present)
 605                 });
 606             }
 607         }
 608     }
 609 }