1 //! Global machine state as well as implementation of the interpreter engine
5 use std::cell::RefCell;
7 use std::num::NonZeroU64;
8 use std::time::Instant;
11 use rand::rngs::StdRng;
12 use rand::SeedableRng;
14 use rustc_data_structures::fx::FxHashMap;
19 layout::{LayoutCx, LayoutError, TyAndLayout},
23 use rustc_span::def_id::DefId;
24 use rustc_span::symbol::{sym, Symbol};
25 use rustc_target::abi::{LayoutOf, Size};
26 use rustc_target::spec::abi::Abi;
30 // Some global facts about the emulated machine.
31 pub const PAGE_SIZE: u64 = 4 * 1024; // FIXME: adjust to target architecture
32 pub const STACK_ADDR: u64 = 32 * PAGE_SIZE; // not really about the "stack", but where we start assigning integer addresses to allocations
33 pub const STACK_SIZE: u64 = 16 * PAGE_SIZE; // whatever
34 pub const NUM_CPUS: u64 = 1;
36 /// Extra data stored with each stack frame
37 pub struct FrameData<'tcx> {
38 /// Extra data for Stacked Borrows.
39 pub call_id: stacked_borrows::CallId,
41 /// If this is Some(), then this is a special "catch unwind" frame (the frame of `try_fn`
42 /// called by `try`). When this frame is popped during unwinding a panic,
43 /// we stop unwinding, use the `CatchUnwindData` to handle catching.
44 pub catch_unwind: Option<CatchUnwindData<'tcx>>,
46 /// If `measureme` profiling is enabled, holds timing information
47 /// for the start of this frame. When we finish executing this frame,
48 /// we use this to register a completed event with `measureme`.
49 pub timing: Option<measureme::DetachedTiming>,
52 impl<'tcx> std::fmt::Debug for FrameData<'tcx> {
53 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
54 // Omitting `timing`, it does not support `Debug`.
55 f.debug_struct("FrameData")
56 .field("call_id", &self.call_id)
57 .field("catch_unwind", &self.catch_unwind)
62 /// Extra memory kinds
63 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
64 pub enum MiriMemoryKind {
65 /// `__rust_alloc` memory.
69 /// Windows `HeapAlloc` memory.
71 /// Memory for args, errno, and other parts of the machine-managed environment.
72 /// This memory may leak.
74 /// Memory for env vars. Separate from `Machine` because we clean it up and leak-check it.
76 /// Globals copied from `tcx`.
77 /// This memory may leak.
79 /// Memory for extern statics.
80 /// This memory may leak.
82 /// Memory for thread-local statics.
83 /// This memory may leak.
87 impl Into<MemoryKind<MiriMemoryKind>> for MiriMemoryKind {
89 fn into(self) -> MemoryKind<MiriMemoryKind> {
90 MemoryKind::Machine(self)
94 impl MayLeak for MiriMemoryKind {
96 fn may_leak(self) -> bool {
97 use self::MiriMemoryKind::*;
99 Rust | C | WinHeap | Env => false,
100 Machine | Global | ExternStatic | Tls => true,
105 impl fmt::Display for MiriMemoryKind {
106 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
107 use self::MiriMemoryKind::*;
109 Rust => write!(f, "Rust heap"),
110 C => write!(f, "C heap"),
111 WinHeap => write!(f, "Windows heap"),
112 Machine => write!(f, "machine-managed memory"),
113 Env => write!(f, "environment variable"),
114 Global => write!(f, "global (static or const)"),
115 ExternStatic => write!(f, "extern static"),
116 Tls => write!(f, "thread-local static"),
121 /// Extra per-allocation data
122 #[derive(Debug, Clone)]
123 pub struct AllocExtra {
124 /// Stacked Borrows state is only added if it is enabled.
125 pub stacked_borrows: Option<stacked_borrows::AllocExtra>,
126 /// Data race detection via the use of a vector-clock,
127 /// this is only added if it is enabled.
128 pub data_race: Option<data_race::AllocExtra>,
131 /// Extra global memory data
133 pub struct MemoryExtra {
134 pub stacked_borrows: Option<stacked_borrows::MemoryExtra>,
135 pub data_race: Option<data_race::MemoryExtra>,
136 pub intptrcast: intptrcast::MemoryExtra,
138 /// Mapping extern static names to their canonical allocation.
139 extern_statics: FxHashMap<Symbol, AllocId>,
141 /// The random number generator used for resolving non-determinism.
142 /// Needs to be queried by ptr_to_int, hence needs interior mutability.
143 pub(crate) rng: RefCell<StdRng>,
145 /// An allocation ID to report when it is being allocated
146 /// (helps for debugging memory leaks and use after free bugs).
147 tracked_alloc_id: Option<AllocId>,
149 /// Controls whether alignment of memory accesses is being checked.
150 pub(crate) check_alignment: AlignmentCheck,
152 /// Failure rate of compare_exchange_weak, between 0.0 and 1.0
153 pub(crate) cmpxchg_weak_failure_rate: f64,
157 pub fn new(config: &MiriConfig) -> Self {
158 let rng = StdRng::seed_from_u64(config.seed.unwrap_or(0));
159 let stacked_borrows = if config.stacked_borrows {
160 Some(RefCell::new(stacked_borrows::GlobalState::new(
161 config.tracked_pointer_tag,
162 config.tracked_call_id,
169 if config.data_race_detector { Some(data_race::GlobalState::new()) } else { None };
173 intptrcast: Default::default(),
174 extern_statics: FxHashMap::default(),
175 rng: RefCell::new(rng),
176 tracked_alloc_id: config.tracked_alloc_id,
177 check_alignment: config.check_alignment,
178 cmpxchg_weak_failure_rate: config.cmpxchg_weak_failure_rate,
182 fn add_extern_static<'tcx, 'mir>(
183 this: &mut MiriEvalContext<'mir, 'tcx>,
187 let ptr = ptr.assert_ptr();
188 assert_eq!(ptr.offset, Size::ZERO);
189 this.memory.extra.extern_statics.try_insert(Symbol::intern(name), ptr.alloc_id).unwrap();
192 /// Sets up the "extern statics" for this machine.
193 pub fn init_extern_statics<'tcx, 'mir>(
194 this: &mut MiriEvalContext<'mir, 'tcx>,
195 ) -> InterpResult<'tcx> {
196 match this.tcx.sess.target.os.as_str() {
198 // "__cxa_thread_atexit_impl"
199 // This should be all-zero, pointer-sized.
200 let layout = this.machine.layouts.usize;
201 let place = this.allocate(layout, MiriMemoryKind::ExternStatic.into());
202 this.write_scalar(Scalar::from_machine_usize(0, this), &place.into())?;
203 Self::add_extern_static(this, "__cxa_thread_atexit_impl", place.ptr);
205 Self::add_extern_static(
208 this.machine.env_vars.environ.unwrap().ptr,
213 // This is some obscure hack that is part of the Windows TLS story. It's a `u8`.
214 let layout = this.machine.layouts.u8;
215 let place = this.allocate(layout, MiriMemoryKind::ExternStatic.into());
216 this.write_scalar(Scalar::from_u8(0), &place.into())?;
217 Self::add_extern_static(this, "_tls_used", place.ptr);
219 _ => {} // No "extern statics" supported on this target
225 /// Precomputed layouts of primitive types
226 pub struct PrimitiveLayouts<'tcx> {
227 pub unit: TyAndLayout<'tcx>,
228 pub i8: TyAndLayout<'tcx>,
229 pub i32: TyAndLayout<'tcx>,
230 pub isize: TyAndLayout<'tcx>,
231 pub u8: TyAndLayout<'tcx>,
232 pub u32: TyAndLayout<'tcx>,
233 pub usize: TyAndLayout<'tcx>,
236 impl<'mir, 'tcx: 'mir> PrimitiveLayouts<'tcx> {
237 fn new(layout_cx: LayoutCx<'tcx, TyCtxt<'tcx>>) -> Result<Self, LayoutError<'tcx>> {
239 unit: layout_cx.layout_of(layout_cx.tcx.mk_unit())?,
240 i8: layout_cx.layout_of(layout_cx.tcx.types.i8)?,
241 i32: layout_cx.layout_of(layout_cx.tcx.types.i32)?,
242 isize: layout_cx.layout_of(layout_cx.tcx.types.isize)?,
243 u8: layout_cx.layout_of(layout_cx.tcx.types.u8)?,
244 u32: layout_cx.layout_of(layout_cx.tcx.types.u32)?,
245 usize: layout_cx.layout_of(layout_cx.tcx.types.usize)?,
250 /// The machine itself.
251 pub struct Evaluator<'mir, 'tcx> {
252 /// Environment variables set by `setenv`.
253 /// Miri does not expose env vars from the host to the emulated program.
254 pub(crate) env_vars: EnvVars<'tcx>,
256 /// Program arguments (`Option` because we can only initialize them after creating the ecx).
257 /// These are *pointers* to argc/argv because macOS.
258 /// We also need the full command line as one string because of Windows.
259 pub(crate) argc: Option<Scalar<Tag>>,
260 pub(crate) argv: Option<Scalar<Tag>>,
261 pub(crate) cmd_line: Option<Scalar<Tag>>,
264 pub(crate) tls: TlsData<'tcx>,
266 /// If enabled, the `env_vars` field is populated with the host env vars during initialization
267 /// and random number generation is delegated to the host.
268 pub(crate) communicate: bool,
270 /// Whether to enforce the validity invariant.
271 pub(crate) validate: bool,
273 /// Whether to enforce [ABI](Abi) of function calls.
274 pub(crate) enforce_abi: bool,
276 pub(crate) file_handler: shims::posix::FileHandler,
277 pub(crate) dir_handler: shims::posix::DirHandler,
279 /// The "time anchor" for this machine's monotone clock (for `Instant` simulation).
280 pub(crate) time_anchor: Instant,
282 /// The set of threads.
283 pub(crate) threads: ThreadManager<'mir, 'tcx>,
285 /// Precomputed `TyLayout`s for primitive data types that are commonly used inside Miri.
286 pub(crate) layouts: PrimitiveLayouts<'tcx>,
288 /// Allocations that are considered roots of static memory (that may leak).
289 pub(crate) static_roots: Vec<AllocId>,
291 /// The `measureme` profiler used to record timing information about
292 /// the emulated program.
293 profiler: Option<measureme::Profiler>,
294 /// Used with `profiler` to cache the `StringId`s for event names
295 /// uesd with `measureme`.
296 string_cache: FxHashMap<String, measureme::StringId>,
298 /// Cache of `Instance` exported under the given `Symbol` name.
299 pub(crate) exported_symbols_cache: FxHashMap<Symbol, Instance<'tcx>>,
302 impl<'mir, 'tcx> Evaluator<'mir, 'tcx> {
303 pub(crate) fn new(config: &MiriConfig, layout_cx: LayoutCx<'tcx, TyCtxt<'tcx>>) -> Self {
305 PrimitiveLayouts::new(layout_cx).expect("Couldn't get layouts of primitive types");
306 let profiler = config.measureme_out.as_ref().map(|out| {
307 measureme::Profiler::new(out).expect("Couldn't create `measureme` profiler")
310 // `env_vars` could be initialized properly here if `Memory` were available before
311 // calling this method.
312 env_vars: EnvVars::default(),
316 tls: TlsData::default(),
317 communicate: config.communicate,
318 validate: config.validate,
319 enforce_abi: config.check_abi,
320 file_handler: Default::default(),
321 dir_handler: Default::default(),
322 time_anchor: Instant::now(),
324 threads: ThreadManager::default(),
325 static_roots: Vec::new(),
327 string_cache: Default::default(),
328 exported_symbols_cache: FxHashMap::default(),
333 /// A rustc InterpCx for Miri.
334 pub type MiriEvalContext<'mir, 'tcx> = InterpCx<'mir, 'tcx, Evaluator<'mir, 'tcx>>;
336 /// A little trait that's useful to be inherited by extension traits.
337 pub trait MiriEvalContextExt<'mir, 'tcx> {
338 fn eval_context_ref<'a>(&'a self) -> &'a MiriEvalContext<'mir, 'tcx>;
339 fn eval_context_mut<'a>(&'a mut self) -> &'a mut MiriEvalContext<'mir, 'tcx>;
341 impl<'mir, 'tcx> MiriEvalContextExt<'mir, 'tcx> for MiriEvalContext<'mir, 'tcx> {
343 fn eval_context_ref(&self) -> &MiriEvalContext<'mir, 'tcx> {
347 fn eval_context_mut(&mut self) -> &mut MiriEvalContext<'mir, 'tcx> {
352 /// Machine hook implementations.
353 impl<'mir, 'tcx> Machine<'mir, 'tcx> for Evaluator<'mir, 'tcx> {
354 type MemoryKind = MiriMemoryKind;
356 type FrameExtra = FrameData<'tcx>;
357 type MemoryExtra = MemoryExtra;
358 type AllocExtra = AllocExtra;
359 type PointerTag = Tag;
360 type ExtraFnVal = Dlsym;
363 MonoHashMap<AllocId, (MemoryKind<MiriMemoryKind>, Allocation<Tag, Self::AllocExtra>)>;
365 const GLOBAL_KIND: Option<MiriMemoryKind> = Some(MiriMemoryKind::Global);
368 fn enforce_alignment(memory_extra: &MemoryExtra) -> bool {
369 memory_extra.check_alignment != AlignmentCheck::None
373 fn force_int_for_alignment_check(memory_extra: &Self::MemoryExtra) -> bool {
374 memory_extra.check_alignment == AlignmentCheck::Int
378 fn enforce_validity(ecx: &InterpCx<'mir, 'tcx, Self>) -> bool {
383 fn enforce_abi(ecx: &InterpCx<'mir, 'tcx, Self>) -> bool {
384 ecx.machine.enforce_abi
388 fn find_mir_or_eval_fn(
389 ecx: &mut InterpCx<'mir, 'tcx, Self>,
390 instance: ty::Instance<'tcx>,
392 args: &[OpTy<'tcx, Tag>],
393 ret: Option<(&PlaceTy<'tcx, Tag>, mir::BasicBlock)>,
394 unwind: StackPopUnwind,
395 ) -> InterpResult<'tcx, Option<&'mir mir::Body<'tcx>>> {
396 ecx.find_mir_or_eval_fn(instance, abi, args, ret, unwind)
401 ecx: &mut InterpCx<'mir, 'tcx, Self>,
404 args: &[OpTy<'tcx, Tag>],
405 ret: Option<(&PlaceTy<'tcx, Tag>, mir::BasicBlock)>,
406 _unwind: StackPopUnwind,
407 ) -> InterpResult<'tcx> {
408 ecx.call_dlsym(fn_val, abi, args, ret)
413 ecx: &mut rustc_mir::interpret::InterpCx<'mir, 'tcx, Self>,
414 instance: ty::Instance<'tcx>,
415 args: &[OpTy<'tcx, Tag>],
416 ret: Option<(&PlaceTy<'tcx, Tag>, mir::BasicBlock)>,
417 unwind: StackPopUnwind,
418 ) -> InterpResult<'tcx> {
419 ecx.call_intrinsic(instance, args, ret, unwind)
424 ecx: &mut InterpCx<'mir, 'tcx, Self>,
425 msg: &mir::AssertMessage<'tcx>,
426 unwind: Option<mir::BasicBlock>,
427 ) -> InterpResult<'tcx> {
428 ecx.assert_panic(msg, unwind)
432 fn abort(_ecx: &mut InterpCx<'mir, 'tcx, Self>, msg: String) -> InterpResult<'tcx, !> {
433 throw_machine_stop!(TerminationInfo::Abort(msg))
438 ecx: &rustc_mir::interpret::InterpCx<'mir, 'tcx, Self>,
440 left: &ImmTy<'tcx, Tag>,
441 right: &ImmTy<'tcx, Tag>,
442 ) -> InterpResult<'tcx, (Scalar<Tag>, bool, ty::Ty<'tcx>)> {
443 ecx.binary_ptr_op(bin_op, left, right)
447 ecx: &mut InterpCx<'mir, 'tcx, Self>,
448 dest: &PlaceTy<'tcx, Tag>,
449 ) -> InterpResult<'tcx> {
450 trace!("box_alloc for {:?}", dest.layout.ty);
451 let layout = ecx.layout_of(dest.layout.ty.builtin_deref(false).unwrap().ty)?;
452 // First argument: `size`.
453 // (`0` is allowed here -- this is expected to be handled by the lang item).
454 let size = Scalar::from_machine_usize(layout.size.bytes(), ecx);
456 // Second argument: `align`.
457 let align = Scalar::from_machine_usize(layout.align.abi.bytes(), ecx);
459 // Call the `exchange_malloc` lang item.
460 let malloc = ecx.tcx.lang_items().exchange_malloc_fn().unwrap();
461 let malloc = ty::Instance::mono(ecx.tcx.tcx, malloc);
465 &[size.into(), align.into()],
467 // Don't do anything when we are done. The `statement()` function will increment
468 // the old stack frame's stmt counter to the next statement, which means that when
469 // `exchange_malloc` returns, we go on evaluating exactly where we want to be.
470 StackPopCleanup::None { cleanup: true },
475 fn thread_local_static_alloc_id(
476 ecx: &mut InterpCx<'mir, 'tcx, Self>,
478 ) -> InterpResult<'tcx, AllocId> {
479 ecx.get_or_create_thread_local_alloc_id(def_id)
482 fn extern_static_alloc_id(
483 memory: &Memory<'mir, 'tcx, Self>,
485 ) -> InterpResult<'tcx, AllocId> {
486 let attrs = memory.tcx.get_attrs(def_id);
487 let link_name = match memory.tcx.sess.first_attr_value_str_by_name(&attrs, sym::link_name) {
489 None => memory.tcx.item_name(def_id),
491 if let Some(&id) = memory.extra.extern_statics.get(&link_name) {
494 throw_unsup_format!("`extern` static {:?} is not supported by Miri", def_id)
498 fn init_allocation_extra<'b>(
499 memory_extra: &MemoryExtra,
501 alloc: Cow<'b, Allocation>,
502 kind: Option<MemoryKind<Self::MemoryKind>>,
503 ) -> (Cow<'b, Allocation<Self::PointerTag, Self::AllocExtra>>, Self::PointerTag) {
504 if Some(id) == memory_extra.tracked_alloc_id {
505 register_diagnostic(NonHaltingDiagnostic::CreatedAlloc(id));
508 let kind = kind.expect("we set our STATIC_KIND so this cannot be None");
509 let alloc = alloc.into_owned();
510 let (stacks, base_tag) = if let Some(stacked_borrows) = &memory_extra.stacked_borrows {
511 let (stacks, base_tag) =
512 Stacks::new_allocation(id, alloc.size(), stacked_borrows, kind);
513 (Some(stacks), base_tag)
515 // No stacks, no tag.
516 (None, Tag::Untagged)
518 let race_alloc = if let Some(data_race) = &memory_extra.data_race {
519 Some(data_race::AllocExtra::new_allocation(&data_race, alloc.size(), kind))
523 let mut stacked_borrows = memory_extra.stacked_borrows.as_ref().map(|sb| sb.borrow_mut());
524 let alloc: Allocation<Tag, Self::AllocExtra> = alloc.with_tags_and_extra(
526 if let Some(stacked_borrows) = &mut stacked_borrows {
527 // Only globals may already contain pointers at this point
528 assert_eq!(kind, MiriMemoryKind::Global.into());
529 stacked_borrows.global_base_ptr(alloc)
534 AllocExtra { stacked_borrows: stacks, data_race: race_alloc },
536 (Cow::Owned(alloc), base_tag)
541 memory_extra: &Self::MemoryExtra,
542 alloc_extra: &AllocExtra,
545 ) -> InterpResult<'tcx> {
546 if let Some(data_race) = &alloc_extra.data_race {
547 data_race.read(ptr, size, memory_extra.data_race.as_ref().unwrap())?;
549 if let Some(stacked_borrows) = &alloc_extra.stacked_borrows {
550 stacked_borrows.memory_read(ptr, size, memory_extra.stacked_borrows.as_ref().unwrap())
558 memory_extra: &mut Self::MemoryExtra,
559 alloc_extra: &mut AllocExtra,
562 ) -> InterpResult<'tcx> {
563 if let Some(data_race) = &mut alloc_extra.data_race {
564 data_race.write(ptr, size, memory_extra.data_race.as_mut().unwrap())?;
566 if let Some(stacked_borrows) = &mut alloc_extra.stacked_borrows {
567 stacked_borrows.memory_written(
570 memory_extra.stacked_borrows.as_mut().unwrap(),
578 fn memory_deallocated(
579 memory_extra: &mut Self::MemoryExtra,
580 alloc_extra: &mut AllocExtra,
583 ) -> InterpResult<'tcx> {
584 if Some(ptr.alloc_id) == memory_extra.tracked_alloc_id {
585 register_diagnostic(NonHaltingDiagnostic::FreedAlloc(ptr.alloc_id));
587 if let Some(data_race) = &mut alloc_extra.data_race {
588 data_race.deallocate(ptr, size, memory_extra.data_race.as_mut().unwrap())?;
590 if let Some(stacked_borrows) = &mut alloc_extra.stacked_borrows {
591 stacked_borrows.memory_deallocated(
594 memory_extra.stacked_borrows.as_mut().unwrap(),
601 fn after_static_mem_initialized(
602 ecx: &mut InterpCx<'mir, 'tcx, Self>,
603 ptr: Pointer<Self::PointerTag>,
605 ) -> InterpResult<'tcx> {
606 if ecx.memory.extra.data_race.is_some() {
607 ecx.reset_vector_clocks(ptr, size)?;
613 fn tag_global_base_pointer(memory_extra: &MemoryExtra, id: AllocId) -> Self::PointerTag {
614 if let Some(stacked_borrows) = &memory_extra.stacked_borrows {
615 stacked_borrows.borrow_mut().global_base_ptr(id)
623 ecx: &mut InterpCx<'mir, 'tcx, Self>,
624 kind: mir::RetagKind,
625 place: &PlaceTy<'tcx, Tag>,
626 ) -> InterpResult<'tcx> {
627 if ecx.memory.extra.stacked_borrows.is_some() { ecx.retag(kind, place) } else { Ok(()) }
632 ecx: &mut InterpCx<'mir, 'tcx, Self>,
633 frame: Frame<'mir, 'tcx, Tag>,
634 ) -> InterpResult<'tcx, Frame<'mir, 'tcx, Tag, FrameData<'tcx>>> {
635 // Start recording our event before doing anything else
636 let timing = if let Some(profiler) = ecx.machine.profiler.as_ref() {
637 let fn_name = frame.instance.to_string();
638 let entry = ecx.machine.string_cache.entry(fn_name.clone());
639 let name = entry.or_insert_with(|| profiler.alloc_string(&*fn_name));
641 Some(profiler.start_recording_interval_event_detached(
643 measureme::EventId::from_label(*name),
644 ecx.get_active_thread().to_u32(),
650 let stacked_borrows = ecx.memory.extra.stacked_borrows.as_ref();
651 let call_id = stacked_borrows.map_or(NonZeroU64::new(1).unwrap(), |stacked_borrows| {
652 stacked_borrows.borrow_mut().new_call()
655 let extra = FrameData { call_id, catch_unwind: None, timing };
656 Ok(frame.with_extra(extra))
660 ecx: &'a InterpCx<'mir, 'tcx, Self>,
661 ) -> &'a [Frame<'mir, 'tcx, Self::PointerTag, Self::FrameExtra>] {
662 ecx.active_thread_stack()
666 ecx: &'a mut InterpCx<'mir, 'tcx, Self>,
667 ) -> &'a mut Vec<Frame<'mir, 'tcx, Self::PointerTag, Self::FrameExtra>> {
668 ecx.active_thread_stack_mut()
672 fn after_stack_push(ecx: &mut InterpCx<'mir, 'tcx, Self>) -> InterpResult<'tcx> {
673 if ecx.memory.extra.stacked_borrows.is_some() { ecx.retag_return_place() } else { Ok(()) }
678 ecx: &mut InterpCx<'mir, 'tcx, Self>,
679 mut frame: Frame<'mir, 'tcx, Tag, FrameData<'tcx>>,
681 ) -> InterpResult<'tcx, StackPopJump> {
682 let timing = frame.extra.timing.take();
683 let res = ecx.handle_stack_pop(frame.extra, unwinding);
684 if let Some(profiler) = ecx.machine.profiler.as_ref() {
685 profiler.finish_recording_interval_event(timing.unwrap());
692 memory: &Memory<'mir, 'tcx, Self>,
694 ) -> InterpResult<'tcx, Pointer<Self::PointerTag>> {
695 intptrcast::GlobalState::int_to_ptr(int, memory)
700 memory: &Memory<'mir, 'tcx, Self>,
701 ptr: Pointer<Self::PointerTag>,
702 ) -> InterpResult<'tcx, u64> {
703 intptrcast::GlobalState::ptr_to_int(ptr, memory)