5 use syntax::source_map::{self, Span, DUMMY_SP};
6 use rustc::hir::def_id::DefId;
7 use rustc::hir::def::DefKind;
9 use rustc::ty::layout::{
10 self, Size, Align, HasDataLayout, LayoutOf, TyLayout
12 use rustc::ty::subst::{Subst, SubstsRef};
13 use rustc::ty::{self, Ty, TyCtxt, TypeFoldable};
14 use rustc::ty::query::TyCtxtAt;
15 use rustc_data_structures::indexed_vec::IndexVec;
16 use rustc::mir::interpret::{
18 GlobalId, Scalar, Pointer, FrameInfo, AllocId,
19 InterpResult, InterpError,
20 truncate, sign_extend,
22 use rustc_data_structures::fx::FxHashMap;
25 Immediate, Operand, MemPlace, MPlaceTy, Place, PlaceTy, ScalarMaybeUndef,
29 pub struct InterpretCx<'mir, 'tcx, M: Machine<'mir, 'tcx>> {
30 /// Stores the `Machine` instance.
33 /// The results of the type checker, from rustc.
34 pub tcx: TyCtxtAt<'tcx>,
36 /// Bounds in scope for polymorphic evaluations.
37 pub(crate) param_env: ty::ParamEnv<'tcx>,
39 /// The virtual memory system.
40 pub(crate) memory: Memory<'mir, 'tcx, M>,
42 /// The virtual call stack.
43 pub(crate) stack: Vec<Frame<'mir, 'tcx, M::PointerTag, M::FrameExtra>>,
45 /// A cache for deduplicating vtables
47 FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), Pointer<M::PointerTag>>,
52 pub struct Frame<'mir, 'tcx, Tag=(), Extra=()> {
53 ////////////////////////////////////////////////////////////////////////////////
54 // Function and callsite information
55 ////////////////////////////////////////////////////////////////////////////////
56 /// The MIR for the function called on this frame.
57 pub body: &'mir mir::Body<'tcx>,
59 /// The def_id and substs of the current function.
60 pub instance: ty::Instance<'tcx>,
62 /// The span of the call site.
63 pub span: source_map::Span,
65 ////////////////////////////////////////////////////////////////////////////////
66 // Return place and locals
67 ////////////////////////////////////////////////////////////////////////////////
68 /// Work to perform when returning from this function.
69 pub return_to_block: StackPopCleanup,
71 /// The location where the result of the current stack frame should be written to,
72 /// and its layout in the caller.
73 pub return_place: Option<PlaceTy<'tcx, Tag>>,
75 /// The list of locals for this stack frame, stored in order as
76 /// `[return_ptr, arguments..., variables..., temporaries...]`.
77 /// The locals are stored as `Option<Value>`s.
78 /// `None` represents a local that is currently dead, while a live local
79 /// can either directly contain `Scalar` or refer to some part of an `Allocation`.
80 pub locals: IndexVec<mir::Local, LocalState<'tcx, Tag>>,
82 ////////////////////////////////////////////////////////////////////////////////
83 // Current position within the function
84 ////////////////////////////////////////////////////////////////////////////////
85 /// The block that is currently executed (or will be executed after the above call stacks
87 pub block: mir::BasicBlock,
89 /// The index of the currently evaluated statement.
92 /// Extra data for the machine.
96 #[derive(Clone, Debug, Eq, PartialEq, Hash)]
97 pub enum StackPopCleanup {
98 /// Jump to the next block in the caller, or cause UB if None (that's a function
99 /// that may never return). Also store layout of return place so
100 /// we can validate it at that layout.
101 Goto(Option<mir::BasicBlock>),
102 /// Just do nohing: Used by Main and for the box_alloc hook in miri.
103 /// `cleanup` says whether locals are deallocated. Static computation
104 /// wants them leaked to intern what they need (and just throw away
105 /// the entire `ecx` when it is done).
106 None { cleanup: bool },
109 /// State of a local variable including a memoized layout
110 #[derive(Clone, PartialEq, Eq)]
111 pub struct LocalState<'tcx, Tag=(), Id=AllocId> {
112 pub value: LocalValue<Tag, Id>,
113 /// Don't modify if `Some`, this is only used to prevent computing the layout twice
114 pub layout: Cell<Option<TyLayout<'tcx>>>,
117 /// Current value of a local variable
118 #[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
119 pub enum LocalValue<Tag=(), Id=AllocId> {
120 /// This local is not currently alive, and cannot be used at all.
122 /// This local is alive but not yet initialized. It can be written to
123 /// but not read from or its address taken. Locals get initialized on
124 /// first write because for unsized locals, we do not know their size
127 /// A normal, live local.
128 /// Mostly for convenience, we re-use the `Operand` type here.
129 /// This is an optimization over just always having a pointer here;
130 /// we can thus avoid doing an allocation when the local just stores
131 /// immediate values *and* never has its address taken.
132 Live(Operand<Tag, Id>),
135 impl<'tcx, Tag: Copy + 'static> LocalState<'tcx, Tag> {
136 pub fn access(&self) -> InterpResult<'tcx, Operand<Tag>> {
138 LocalValue::Dead => err!(DeadLocal),
139 LocalValue::Uninitialized =>
140 bug!("The type checker should prevent reading from a never-written local"),
141 LocalValue::Live(val) => Ok(val),
145 /// Overwrite the local. If the local can be overwritten in place, return a reference
146 /// to do so; otherwise return the `MemPlace` to consult instead.
149 ) -> InterpResult<'tcx, Result<&mut LocalValue<Tag>, MemPlace<Tag>>> {
151 LocalValue::Dead => err!(DeadLocal),
152 LocalValue::Live(Operand::Indirect(mplace)) => Ok(Err(mplace)),
153 ref mut local @ LocalValue::Live(Operand::Immediate(_)) |
154 ref mut local @ LocalValue::Uninitialized => {
161 impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> HasDataLayout for InterpretCx<'mir, 'tcx, M> {
163 fn data_layout(&self) -> &layout::TargetDataLayout {
164 &self.tcx.data_layout
168 impl<'mir, 'tcx, M> layout::HasTyCtxt<'tcx> for InterpretCx<'mir, 'tcx, M>
170 M: Machine<'mir, 'tcx>,
173 fn tcx(&self) -> TyCtxt<'tcx> {
178 impl<'mir, 'tcx, M> layout::HasParamEnv<'tcx> for InterpretCx<'mir, 'tcx, M>
180 M: Machine<'mir, 'tcx>,
182 fn param_env(&self) -> ty::ParamEnv<'tcx> {
187 impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> LayoutOf for InterpretCx<'mir, 'tcx, M> {
189 type TyLayout = InterpResult<'tcx, TyLayout<'tcx>>;
192 fn layout_of(&self, ty: Ty<'tcx>) -> Self::TyLayout {
193 self.tcx.layout_of(self.param_env.and(ty))
194 .map_err(|layout| InterpError::Layout(layout).into())
198 impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> InterpretCx<'mir, 'tcx, M> {
199 pub fn new(tcx: TyCtxtAt<'tcx>, param_env: ty::ParamEnv<'tcx>, machine: M) -> Self {
204 memory: Memory::new(tcx),
206 vtables: FxHashMap::default(),
211 pub fn memory(&self) -> &Memory<'mir, 'tcx, M> {
216 pub fn memory_mut(&mut self) -> &mut Memory<'mir, 'tcx, M> {
221 pub fn tag_static_base_pointer(&self, ptr: Pointer) -> Pointer<M::PointerTag> {
222 self.memory.tag_static_base_pointer(ptr)
226 pub fn stack(&self) -> &[Frame<'mir, 'tcx, M::PointerTag, M::FrameExtra>] {
231 pub fn cur_frame(&self) -> usize {
232 assert!(self.stack.len() > 0);
237 pub fn frame(&self) -> &Frame<'mir, 'tcx, M::PointerTag, M::FrameExtra> {
238 self.stack.last().expect("no call frames exist")
242 pub fn frame_mut(&mut self) -> &mut Frame<'mir, 'tcx, M::PointerTag, M::FrameExtra> {
243 self.stack.last_mut().expect("no call frames exist")
247 pub(super) fn body(&self) -> &'mir mir::Body<'tcx> {
251 pub(super) fn subst_and_normalize_erasing_regions<T: TypeFoldable<'tcx>>(
254 ) -> InterpResult<'tcx, T> {
255 match self.stack.last() {
256 Some(frame) => Ok(self.tcx.subst_and_normalize_erasing_regions(
257 frame.instance.substs,
261 None => if substs.needs_subst() {
262 err!(TooGeneric).into()
269 pub(super) fn resolve(
272 substs: SubstsRef<'tcx>
273 ) -> InterpResult<'tcx, ty::Instance<'tcx>> {
274 trace!("resolve: {:?}, {:#?}", def_id, substs);
275 trace!("param_env: {:#?}", self.param_env);
276 let substs = self.subst_and_normalize_erasing_regions(substs)?;
277 trace!("substs: {:#?}", substs);
278 ty::Instance::resolve(
283 ).ok_or_else(|| InterpError::TooGeneric.into())
286 pub fn type_is_sized(&self, ty: Ty<'tcx>) -> bool {
287 ty.is_sized(self.tcx, self.param_env)
290 pub fn type_is_freeze(&self, ty: Ty<'tcx>) -> bool {
291 ty.is_freeze(*self.tcx, self.param_env, DUMMY_SP)
296 instance: ty::InstanceDef<'tcx>,
297 ) -> InterpResult<'tcx, &'tcx mir::Body<'tcx>> {
298 // do not continue if typeck errors occurred (can only occur in local crate)
299 let did = instance.def_id();
301 && self.tcx.has_typeck_tables(did)
302 && self.tcx.typeck_tables_of(did).tainted_by_errors
304 return err!(TypeckError);
306 trace!("load mir {:?}", instance);
308 ty::InstanceDef::Item(def_id) => if self.tcx.is_mir_available(did) {
309 Ok(self.tcx.optimized_mir(did))
311 err!(NoMirFor(self.tcx.def_path_str(def_id)))
313 _ => Ok(self.tcx.instance_mir(instance)),
317 pub(super) fn monomorphize<T: TypeFoldable<'tcx> + Subst<'tcx>>(
320 ) -> InterpResult<'tcx, T> {
321 match self.stack.last() {
322 Some(frame) => Ok(self.monomorphize_with_substs(t, frame.instance.substs)?),
323 None => if t.needs_subst() {
324 err!(TooGeneric).into()
331 fn monomorphize_with_substs<T: TypeFoldable<'tcx> + Subst<'tcx>>(
334 substs: SubstsRef<'tcx>
335 ) -> InterpResult<'tcx, T> {
336 // miri doesn't care about lifetimes, and will choke on some crazy ones
337 // let's simply get rid of them
338 let substituted = t.subst(*self.tcx, substs);
340 if substituted.needs_subst() {
341 return err!(TooGeneric);
344 Ok(self.tcx.normalize_erasing_regions(ty::ParamEnv::reveal_all(), substituted))
347 pub fn layout_of_local(
349 frame: &Frame<'mir, 'tcx, M::PointerTag, M::FrameExtra>,
351 layout: Option<TyLayout<'tcx>>,
352 ) -> InterpResult<'tcx, TyLayout<'tcx>> {
353 match frame.locals[local].layout.get() {
355 let layout = crate::interpret::operand::from_known_layout(layout, || {
356 let local_ty = frame.body.local_decls[local].ty;
357 let local_ty = self.monomorphize_with_substs(local_ty, frame.instance.substs)?;
358 self.layout_of(local_ty)
360 // Layouts of locals are requested a lot, so we cache them.
361 frame.locals[local].layout.set(Some(layout));
364 Some(layout) => Ok(layout),
368 /// Returns the actual dynamic size and alignment of the place at the given type.
369 /// Only the "meta" (metadata) part of the place matters.
370 /// This can fail to provide an answer for extern types.
371 pub(super) fn size_and_align_of(
373 metadata: Option<Scalar<M::PointerTag>>,
374 layout: TyLayout<'tcx>,
375 ) -> InterpResult<'tcx, Option<(Size, Align)>> {
376 if !layout.is_unsized() {
377 return Ok(Some((layout.size, layout.align.abi)));
379 match layout.ty.sty {
380 ty::Adt(..) | ty::Tuple(..) => {
381 // First get the size of all statically known fields.
382 // Don't use type_of::sizing_type_of because that expects t to be sized,
383 // and it also rounds up to alignment, which we want to avoid,
384 // as the unsized field's alignment could be smaller.
385 assert!(!layout.ty.is_simd());
386 trace!("DST layout: {:?}", layout);
388 let sized_size = layout.fields.offset(layout.fields.count() - 1);
389 let sized_align = layout.align.abi;
391 "DST {} statically sized prefix size: {:?} align: {:?}",
397 // Recurse to get the size of the dynamically sized field (must be
398 // the last field). Can't have foreign types here, how would we
399 // adjust alignment and size for them?
400 let field = layout.field(self, layout.fields.count() - 1)?;
401 let (unsized_size, unsized_align) = match self.size_and_align_of(metadata, field)? {
402 Some(size_and_align) => size_and_align,
404 // A field with extern type. If this field is at offset 0, we behave
405 // like the underlying extern type.
406 // FIXME: Once we have made decisions for how to handle size and alignment
407 // of `extern type`, this should be adapted. It is just a temporary hack
408 // to get some code to work that probably ought to work.
409 if sized_size == Size::ZERO {
412 bug!("Fields cannot be extern types, unless they are at offset 0")
417 // FIXME (#26403, #27023): We should be adding padding
418 // to `sized_size` (to accommodate the `unsized_align`
419 // required of the unsized field that follows) before
420 // summing it with `sized_size`. (Note that since #26403
421 // is unfixed, we do not yet add the necessary padding
422 // here. But this is where the add would go.)
424 // Return the sum of sizes and max of aligns.
425 let size = sized_size + unsized_size;
427 // Choose max of two known alignments (combined value must
428 // be aligned according to more restrictive of the two).
429 let align = sized_align.max(unsized_align);
431 // Issue #27023: must add any necessary padding to `size`
432 // (to make it a multiple of `align`) before returning it.
434 // Namely, the returned size should be, in C notation:
436 // `size + ((size & (align-1)) ? align : 0)`
438 // emulated via the semi-standard fast bit trick:
440 // `(size + (align-1)) & -align`
442 Ok(Some((size.align_to(align), align)))
445 let vtable = metadata.expect("dyn trait fat ptr must have vtable");
446 // the second entry in the vtable is the dynamic size of the object.
447 Ok(Some(self.read_size_and_align_from_vtable(vtable)?))
450 ty::Slice(_) | ty::Str => {
451 let len = metadata.expect("slice fat ptr must have vtable").to_usize(self)?;
452 let elem = layout.field(self, 0)?;
453 Ok(Some((elem.size * len, elem.align.abi)))
460 _ => bug!("size_and_align_of::<{:?}> not supported", layout.ty),
464 pub fn size_and_align_of_mplace(
466 mplace: MPlaceTy<'tcx, M::PointerTag>
467 ) -> InterpResult<'tcx, Option<(Size, Align)>> {
468 self.size_and_align_of(mplace.meta, mplace.layout)
471 pub fn push_stack_frame(
473 instance: ty::Instance<'tcx>,
474 span: source_map::Span,
475 body: &'mir mir::Body<'tcx>,
476 return_place: Option<PlaceTy<'tcx, M::PointerTag>>,
477 return_to_block: StackPopCleanup,
478 ) -> InterpResult<'tcx> {
479 if self.stack.len() > 0 {
480 info!("PAUSING({}) {}", self.cur_frame(), self.frame().instance);
482 ::log_settings::settings().indentation += 1;
484 // first push a stack frame so we have access to the local substs
485 let extra = M::stack_push(self)?;
486 self.stack.push(Frame {
488 block: mir::START_BLOCK,
491 // empty local array, we fill it in below, after we are inside the stack frame and
492 // all methods actually know about the frame
493 locals: IndexVec::new(),
500 // don't allocate at all for trivial constants
501 if body.local_decls.len() > 1 {
502 // Locals are initially uninitialized.
503 let dummy = LocalState {
504 value: LocalValue::Uninitialized,
505 layout: Cell::new(None),
507 let mut locals = IndexVec::from_elem(dummy, &body.local_decls);
508 // Return place is handled specially by the `eval_place` functions, and the
509 // entry in `locals` should never be used. Make it dead, to be sure.
510 locals[mir::RETURN_PLACE].value = LocalValue::Dead;
511 // Now mark those locals as dead that we do not want to initialize
512 match self.tcx.def_kind(instance.def_id()) {
513 // statics and constants don't have `Storage*` statements, no need to look for them
514 Some(DefKind::Static)
515 | Some(DefKind::Const)
516 | Some(DefKind::AssocConst) => {},
518 trace!("push_stack_frame: {:?}: num_bbs: {}", span, body.basic_blocks().len());
519 for block in body.basic_blocks() {
520 for stmt in block.statements.iter() {
521 use rustc::mir::StatementKind::{StorageDead, StorageLive};
524 StorageDead(local) => {
525 locals[local].value = LocalValue::Dead;
534 self.frame_mut().locals = locals;
537 info!("ENTERING({}) {}", self.cur_frame(), self.frame().instance);
539 if self.stack.len() > self.tcx.sess.const_eval_stack_frame_limit {
540 err!(StackFrameLimitReached)
546 pub(super) fn pop_stack_frame(&mut self) -> InterpResult<'tcx> {
547 info!("LEAVING({}) {}", self.cur_frame(), self.frame().instance);
548 ::log_settings::settings().indentation -= 1;
549 let frame = self.stack.pop().expect(
550 "tried to pop a stack frame, but there were none",
552 M::stack_pop(self, frame.extra)?;
553 // Abort early if we do not want to clean up: We also avoid validation in that case,
554 // because this is CTFE and the final value will be thoroughly validated anyway.
555 match frame.return_to_block {
556 StackPopCleanup::Goto(_) => {},
557 StackPopCleanup::None { cleanup } => {
559 assert!(self.stack.is_empty(), "only the topmost frame should ever be leaked");
560 // Leak the locals, skip validation.
565 // Deallocate all locals that are backed by an allocation.
566 for local in frame.locals {
567 self.deallocate_local(local.value)?;
569 // Validate the return value. Do this after deallocating so that we catch dangling
571 if let Some(return_place) = frame.return_place {
572 if M::enforce_validity(self) {
573 // Data got changed, better make sure it matches the type!
574 // It is still possible that the return place held invalid data while
575 // the function is running, but that's okay because nobody could have
576 // accessed that same data from the "outside" to observe any broken
577 // invariant -- that is, unless a function somehow has a ptr to
578 // its return place... but the way MIR is currently generated, the
579 // return place is always a local and then this cannot happen.
580 self.validate_operand(
581 self.place_to_op(return_place)?,
587 // Uh, that shouldn't happen... the function did not intend to return
588 return err!(Unreachable);
590 // Jump to new block -- *after* validation so that the spans make more sense.
591 match frame.return_to_block {
592 StackPopCleanup::Goto(block) => {
593 self.goto_block(block)?;
595 StackPopCleanup::None { .. } => {}
598 if self.stack.len() > 0 {
599 info!("CONTINUING({}) {}", self.cur_frame(), self.frame().instance);
605 /// Mark a storage as live, killing the previous content and returning it.
606 /// Remember to deallocate that!
610 ) -> InterpResult<'tcx, LocalValue<M::PointerTag>> {
611 assert!(local != mir::RETURN_PLACE, "Cannot make return place live");
612 trace!("{:?} is now live", local);
614 let local_val = LocalValue::Uninitialized;
615 // StorageLive *always* kills the value that's currently stored.
616 // However, we do not error if the variable already is live;
617 // see <https://github.com/rust-lang/rust/issues/42371>.
618 Ok(mem::replace(&mut self.frame_mut().locals[local].value, local_val))
621 /// Returns the old value of the local.
622 /// Remember to deallocate that!
623 pub fn storage_dead(&mut self, local: mir::Local) -> LocalValue<M::PointerTag> {
624 assert!(local != mir::RETURN_PLACE, "Cannot make return place dead");
625 trace!("{:?} is now dead", local);
627 mem::replace(&mut self.frame_mut().locals[local].value, LocalValue::Dead)
630 pub(super) fn deallocate_local(
632 local: LocalValue<M::PointerTag>,
633 ) -> InterpResult<'tcx> {
634 // FIXME: should we tell the user that there was a local which was never written to?
635 if let LocalValue::Live(Operand::Indirect(MemPlace { ptr, .. })) = local {
636 trace!("deallocating local");
637 let ptr = ptr.to_ptr()?;
638 self.memory.dump_alloc(ptr.alloc_id);
639 self.memory.deallocate_local(ptr)?;
644 pub fn const_eval_raw(
647 ) -> InterpResult<'tcx, MPlaceTy<'tcx, M::PointerTag>> {
648 // FIXME(oli-obk): make this check an assertion that it's not a static here
649 // FIXME(RalfJ, oli-obk): document that `Place::Static` can never be anything but a static
650 // and `ConstValue::Unevaluated` can never be a static
651 let param_env = if self.tcx.is_static(gid.instance.def_id()) {
652 ty::ParamEnv::reveal_all()
656 // We use `const_eval_raw` here, and get an unvalidated result. That is okay:
657 // Our result will later be validated anyway, and there seems no good reason
658 // to have to fail early here. This is also more consistent with
659 // `Memory::get_static_alloc` which has to use `const_eval_raw` to avoid cycles.
660 let val = self.tcx.const_eval_raw(param_env.and(gid)).map_err(|err| {
662 ErrorHandled::Reported => InterpError::ReferencedConstant,
663 ErrorHandled::TooGeneric => InterpError::TooGeneric,
666 self.raw_const_to_mplace(val)
669 pub fn dump_place(&self, place: Place<M::PointerTag>) {
671 if !log_enabled!(::log::Level::Trace) {
675 Place::Local { frame, local } => {
676 let mut allocs = Vec::new();
677 let mut msg = format!("{:?}", local);
678 if frame != self.cur_frame() {
679 write!(msg, " ({} frames up)", self.cur_frame() - frame).unwrap();
681 write!(msg, ":").unwrap();
683 match self.stack[frame].locals[local].value {
684 LocalValue::Dead => write!(msg, " is dead").unwrap(),
685 LocalValue::Uninitialized => write!(msg, " is uninitialized").unwrap(),
686 LocalValue::Live(Operand::Indirect(mplace)) => {
688 Scalar::Ptr(ptr) => {
689 write!(msg, " by align({}){} ref:",
690 mplace.align.bytes(),
692 Some(meta) => format!(" meta({:?})", meta),
693 None => String::new()
696 allocs.push(ptr.alloc_id);
698 ptr => write!(msg, " by integral ref: {:?}", ptr).unwrap(),
701 LocalValue::Live(Operand::Immediate(Immediate::Scalar(val))) => {
702 write!(msg, " {:?}", val).unwrap();
703 if let ScalarMaybeUndef::Scalar(Scalar::Ptr(ptr)) = val {
704 allocs.push(ptr.alloc_id);
707 LocalValue::Live(Operand::Immediate(Immediate::ScalarPair(val1, val2))) => {
708 write!(msg, " ({:?}, {:?})", val1, val2).unwrap();
709 if let ScalarMaybeUndef::Scalar(Scalar::Ptr(ptr)) = val1 {
710 allocs.push(ptr.alloc_id);
712 if let ScalarMaybeUndef::Scalar(Scalar::Ptr(ptr)) = val2 {
713 allocs.push(ptr.alloc_id);
719 self.memory.dump_allocs(allocs);
721 Place::Ptr(mplace) => {
723 Scalar::Ptr(ptr) => {
724 trace!("by align({}) ref:", mplace.align.bytes());
725 self.memory.dump_alloc(ptr.alloc_id);
727 ptr => trace!(" integral by ref: {:?}", ptr),
733 pub fn generate_stacktrace(&self, explicit_span: Option<Span>) -> Vec<FrameInfo<'tcx>> {
734 let mut last_span = None;
735 let mut frames = Vec::new();
736 for &Frame { instance, span, body, block, stmt, .. } in self.stack().iter().rev() {
737 // make sure we don't emit frames that are duplicates of the previous
738 if explicit_span == Some(span) {
739 last_span = Some(span);
742 if let Some(last) = last_span {
747 last_span = Some(span);
749 let block = &body.basic_blocks()[block];
750 let source_info = if stmt < block.statements.len() {
751 block.statements[stmt].source_info
753 block.terminator().source_info
755 let lint_root = match body.source_scope_local_data {
756 mir::ClearCrossCrate::Set(ref ivs) => Some(ivs[source_info.scope].lint_root),
757 mir::ClearCrossCrate::Clear => None,
759 frames.push(FrameInfo { call_site: span, instance, lint_root });
761 trace!("generate stacktrace: {:#?}, {:?}", frames, explicit_span);
766 pub fn sign_extend(&self, value: u128, ty: TyLayout<'_>) -> u128 {
767 assert!(ty.abi.is_signed());
768 sign_extend(value, ty.size)
772 pub fn truncate(&self, value: u128, ty: TyLayout<'_>) -> u128 {
773 truncate(value, ty.size)
779 scalar: Scalar<M::PointerTag>,
780 ) -> InterpResult<'tcx, Pointer<M::PointerTag>> {
781 self.memory.force_ptr(scalar)
787 scalar: Scalar<M::PointerTag>,
789 ) -> InterpResult<'tcx, u128> {
790 self.memory.force_bits(scalar, size)