1 //! Global machine state as well as implementation of the interpreter engine
5 use std::cell::RefCell;
6 use std::collections::HashSet;
8 use std::num::NonZeroU64;
9 use std::time::Instant;
11 use rand::rngs::StdRng;
12 use rand::SeedableRng;
14 use rustc_ast::ast::Mutability;
15 use rustc_data_structures::fx::FxHashMap;
17 use rustc_data_structures::static_assert_size;
22 layout::{LayoutCx, LayoutError, LayoutOf, TyAndLayout},
23 Instance, TyCtxt, TypeAndMut,
26 use rustc_span::def_id::{CrateNum, DefId};
27 use rustc_span::Symbol;
28 use rustc_target::abi::Size;
29 use rustc_target::spec::abi::Abi;
31 use crate::{shims::posix::FileHandler, *};
33 // Some global facts about the emulated machine.
34 pub const PAGE_SIZE: u64 = 4 * 1024; // FIXME: adjust to target architecture
35 pub const STACK_ADDR: u64 = 32 * PAGE_SIZE; // not really about the "stack", but where we start assigning integer addresses to allocations
36 pub const STACK_SIZE: u64 = 16 * PAGE_SIZE; // whatever
37 pub const NUM_CPUS: u64 = 1;
39 /// Extra data stored with each stack frame
40 pub struct FrameData<'tcx> {
41 /// Extra data for Stacked Borrows.
42 pub call_id: stacked_borrows::CallId,
44 /// If this is Some(), then this is a special "catch unwind" frame (the frame of `try_fn`
45 /// called by `try`). When this frame is popped during unwinding a panic,
46 /// we stop unwinding, use the `CatchUnwindData` to handle catching.
47 pub catch_unwind: Option<CatchUnwindData<'tcx>>,
49 /// If `measureme` profiling is enabled, holds timing information
50 /// for the start of this frame. When we finish executing this frame,
51 /// we use this to register a completed event with `measureme`.
52 pub timing: Option<measureme::DetachedTiming>,
55 impl<'tcx> std::fmt::Debug for FrameData<'tcx> {
56 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
57 // Omitting `timing`, it does not support `Debug`.
58 let FrameData { call_id, catch_unwind, timing: _ } = self;
59 f.debug_struct("FrameData")
60 .field("call_id", call_id)
61 .field("catch_unwind", catch_unwind)
66 /// Extra memory kinds
67 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
68 pub enum MiriMemoryKind {
69 /// `__rust_alloc` memory.
73 /// Windows `HeapAlloc` memory.
75 /// Memory for args, errno, and other parts of the machine-managed environment.
76 /// This memory may leak.
78 /// Memory allocated by the runtime (e.g. env vars). Separate from `Machine`
79 /// because we clean it up and leak-check it.
81 /// Globals copied from `tcx`.
82 /// This memory may leak.
84 /// Memory for extern statics.
85 /// This memory may leak.
87 /// Memory for thread-local statics.
88 /// This memory may leak.
92 impl Into<MemoryKind<MiriMemoryKind>> for MiriMemoryKind {
94 fn into(self) -> MemoryKind<MiriMemoryKind> {
95 MemoryKind::Machine(self)
99 impl MayLeak for MiriMemoryKind {
101 fn may_leak(self) -> bool {
102 use self::MiriMemoryKind::*;
104 Rust | C | WinHeap | Runtime => false,
105 Machine | Global | ExternStatic | Tls => true,
110 impl fmt::Display for MiriMemoryKind {
111 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
112 use self::MiriMemoryKind::*;
114 Rust => write!(f, "Rust heap"),
115 C => write!(f, "C heap"),
116 WinHeap => write!(f, "Windows heap"),
117 Machine => write!(f, "machine-managed memory"),
118 Runtime => write!(f, "language runtime memory"),
119 Global => write!(f, "global (static or const)"),
120 ExternStatic => write!(f, "extern static"),
121 Tls => write!(f, "thread-local static"),
126 /// Pointer provenance (tag).
127 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
129 Concrete(ConcreteTag),
133 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
134 pub struct ConcreteTag {
135 pub alloc_id: AllocId,
136 /// Stacked Borrows tag.
140 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
141 static_assert_size!(Pointer<Tag>, 24);
142 // #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
143 // static_assert_size!(Pointer<Option<Tag>>, 24);
144 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
145 static_assert_size!(ScalarMaybeUninit<Tag>, 32);
147 impl Provenance for Tag {
148 /// We use absolute addresses in the `offset` of a `Pointer<Tag>`.
149 const OFFSET_IS_ADDR: bool = true;
151 /// We cannot err on partial overwrites, it happens too often in practice (due to unions).
152 const ERR_ON_PARTIAL_PTR_OVERWRITE: bool = false;
154 fn fmt(ptr: &Pointer<Self>, f: &mut fmt::Formatter<'_>) -> fmt::Result {
155 let (tag, addr) = ptr.into_parts(); // address is absolute
156 write!(f, "0x{:x}", addr.bytes())?;
159 Tag::Concrete(tag) => {
160 // Forward `alternate` flag to `alloc_id` printing.
162 write!(f, "[{:#?}]", tag.alloc_id)?;
164 write!(f, "[{:?}]", tag.alloc_id)?;
166 // Print Stacked Borrows tag.
167 write!(f, "{:?}", tag.sb)?;
170 write!(f, "[Wildcard]")?;
177 fn get_alloc_id(self) -> Option<AllocId> {
179 Tag::Concrete(concrete) => Some(concrete.alloc_id),
180 Tag::Wildcard => None,
185 /// Extra per-allocation data
186 #[derive(Debug, Clone)]
187 pub struct AllocExtra {
188 /// Stacked Borrows state is only added if it is enabled.
189 pub stacked_borrows: Option<stacked_borrows::AllocExtra>,
190 /// Data race detection via the use of a vector-clock,
191 /// this is only added if it is enabled.
192 pub data_race: Option<data_race::AllocExtra>,
195 /// Precomputed layouts of primitive types
196 pub struct PrimitiveLayouts<'tcx> {
197 pub unit: TyAndLayout<'tcx>,
198 pub i8: TyAndLayout<'tcx>,
199 pub i16: TyAndLayout<'tcx>,
200 pub i32: TyAndLayout<'tcx>,
201 pub isize: TyAndLayout<'tcx>,
202 pub u8: TyAndLayout<'tcx>,
203 pub u16: TyAndLayout<'tcx>,
204 pub u32: TyAndLayout<'tcx>,
205 pub usize: TyAndLayout<'tcx>,
206 pub bool: TyAndLayout<'tcx>,
207 pub mut_raw_ptr: TyAndLayout<'tcx>,
210 impl<'mir, 'tcx: 'mir> PrimitiveLayouts<'tcx> {
211 fn new(layout_cx: LayoutCx<'tcx, TyCtxt<'tcx>>) -> Result<Self, LayoutError<'tcx>> {
212 let tcx = layout_cx.tcx;
213 let mut_raw_ptr = tcx.mk_ptr(TypeAndMut { ty: tcx.types.unit, mutbl: Mutability::Mut });
215 unit: layout_cx.layout_of(tcx.mk_unit())?,
216 i8: layout_cx.layout_of(tcx.types.i8)?,
217 i16: layout_cx.layout_of(tcx.types.i16)?,
218 i32: layout_cx.layout_of(tcx.types.i32)?,
219 isize: layout_cx.layout_of(tcx.types.isize)?,
220 u8: layout_cx.layout_of(tcx.types.u8)?,
221 u16: layout_cx.layout_of(tcx.types.u16)?,
222 u32: layout_cx.layout_of(tcx.types.u32)?,
223 usize: layout_cx.layout_of(tcx.types.usize)?,
224 bool: layout_cx.layout_of(tcx.types.bool)?,
225 mut_raw_ptr: layout_cx.layout_of(mut_raw_ptr)?,
230 /// The machine itself.
231 pub struct Evaluator<'mir, 'tcx> {
232 pub stacked_borrows: Option<stacked_borrows::GlobalState>,
233 pub data_race: Option<data_race::GlobalState>,
234 pub intptrcast: intptrcast::GlobalState,
236 /// Environment variables set by `setenv`.
237 /// Miri does not expose env vars from the host to the emulated program.
238 pub(crate) env_vars: EnvVars<'tcx>,
240 /// Program arguments (`Option` because we can only initialize them after creating the ecx).
241 /// These are *pointers* to argc/argv because macOS.
242 /// We also need the full command line as one string because of Windows.
243 pub(crate) argc: Option<MemPlace<Tag>>,
244 pub(crate) argv: Option<MemPlace<Tag>>,
245 pub(crate) cmd_line: Option<MemPlace<Tag>>,
248 pub(crate) tls: TlsData<'tcx>,
250 /// What should Miri do when an op requires communicating with the host,
251 /// such as accessing host env vars, random number generation, and
252 /// file system access.
253 pub(crate) isolated_op: IsolatedOp,
255 /// Whether to enforce the validity invariant.
256 pub(crate) validate: bool,
258 /// Whether to enforce validity (e.g., initialization) of integers and floats.
259 pub(crate) enforce_number_validity: bool,
261 /// Whether to enforce [ABI](Abi) of function calls.
262 pub(crate) enforce_abi: bool,
264 pub(crate) file_handler: shims::posix::FileHandler,
265 pub(crate) dir_handler: shims::posix::DirHandler,
267 /// The "time anchor" for this machine's monotone clock (for `Instant` simulation).
268 pub(crate) time_anchor: Instant,
270 /// The set of threads.
271 pub(crate) threads: ThreadManager<'mir, 'tcx>,
273 /// Precomputed `TyLayout`s for primitive data types that are commonly used inside Miri.
274 pub(crate) layouts: PrimitiveLayouts<'tcx>,
276 /// Allocations that are considered roots of static memory (that may leak).
277 pub(crate) static_roots: Vec<AllocId>,
279 /// The `measureme` profiler used to record timing information about
280 /// the emulated program.
281 profiler: Option<measureme::Profiler>,
282 /// Used with `profiler` to cache the `StringId`s for event names
283 /// uesd with `measureme`.
284 string_cache: FxHashMap<String, measureme::StringId>,
286 /// Cache of `Instance` exported under the given `Symbol` name.
287 /// `None` means no `Instance` exported under the given name is found.
288 pub(crate) exported_symbols_cache: FxHashMap<Symbol, Option<Instance<'tcx>>>,
290 /// Whether to raise a panic in the context of the evaluated process when unsupported
291 /// functionality is encountered. If `false`, an error is propagated in the Miri application context
292 /// instead (default behavior)
293 pub(crate) panic_on_unsupported: bool,
295 /// Equivalent setting as RUST_BACKTRACE on encountering an error.
296 pub(crate) backtrace_style: BacktraceStyle,
298 /// Crates which are considered local for the purposes of error reporting.
299 pub(crate) local_crates: Vec<CrateNum>,
301 /// Mapping extern static names to their base pointer.
302 extern_statics: FxHashMap<Symbol, Pointer<Tag>>,
304 /// The random number generator used for resolving non-determinism.
305 /// Needs to be queried by ptr_to_int, hence needs interior mutability.
306 pub(crate) rng: RefCell<StdRng>,
308 /// The allocation IDs to report when they are being allocated
309 /// (helps for debugging memory leaks and use after free bugs).
310 tracked_alloc_ids: HashSet<AllocId>,
312 /// Controls whether alignment of memory accesses is being checked.
313 pub(crate) check_alignment: AlignmentCheck,
315 /// Failure rate of compare_exchange_weak, between 0.0 and 1.0
316 pub(crate) cmpxchg_weak_failure_rate: f64,
318 /// Corresponds to -Zmiri-mute-stdout-stderr and doesn't write the output but acts as if it succeeded.
319 pub(crate) mute_stdout_stderr: bool,
322 impl<'mir, 'tcx> Evaluator<'mir, 'tcx> {
323 pub(crate) fn new(config: &MiriConfig, layout_cx: LayoutCx<'tcx, TyCtxt<'tcx>>) -> Self {
324 let local_crates = helpers::get_local_crates(&layout_cx.tcx);
326 PrimitiveLayouts::new(layout_cx).expect("Couldn't get layouts of primitive types");
327 let profiler = config.measureme_out.as_ref().map(|out| {
328 measureme::Profiler::new(out).expect("Couldn't create `measureme` profiler")
330 let rng = StdRng::seed_from_u64(config.seed.unwrap_or(0));
331 let stacked_borrows = if config.stacked_borrows {
332 Some(RefCell::new(stacked_borrows::GlobalStateInner::new(
333 config.tracked_pointer_tags.clone(),
334 config.tracked_call_ids.clone(),
341 if config.data_race_detector { Some(data_race::GlobalState::new()) } else { None };
345 intptrcast: RefCell::new(intptrcast::GlobalStateInner::new(config)),
346 // `env_vars` depends on a full interpreter so we cannot properly initialize it yet.
347 env_vars: EnvVars::default(),
351 tls: TlsData::default(),
352 isolated_op: config.isolated_op,
353 validate: config.validate,
354 enforce_number_validity: config.check_number_validity,
355 enforce_abi: config.check_abi,
356 file_handler: FileHandler::new(config.mute_stdout_stderr),
357 dir_handler: Default::default(),
358 time_anchor: Instant::now(),
360 threads: ThreadManager::default(),
361 static_roots: Vec::new(),
363 string_cache: Default::default(),
364 exported_symbols_cache: FxHashMap::default(),
365 panic_on_unsupported: config.panic_on_unsupported,
366 backtrace_style: config.backtrace_style,
368 extern_statics: FxHashMap::default(),
369 rng: RefCell::new(rng),
370 tracked_alloc_ids: config.tracked_alloc_ids.clone(),
371 check_alignment: config.check_alignment,
372 cmpxchg_weak_failure_rate: config.cmpxchg_weak_failure_rate,
373 mute_stdout_stderr: config.mute_stdout_stderr,
377 pub(crate) fn late_init(
378 this: &mut MiriEvalContext<'mir, 'tcx>,
380 ) -> InterpResult<'tcx> {
381 EnvVars::init(this, config)?;
382 Evaluator::init_extern_statics(this)?;
386 fn add_extern_static(
387 this: &mut MiriEvalContext<'mir, 'tcx>,
389 ptr: Pointer<Option<Tag>>,
391 // This got just allocated, so there definitely is a pointer here.
392 let ptr = ptr.into_pointer_or_addr().unwrap();
393 this.machine.extern_statics.try_insert(Symbol::intern(name), ptr).unwrap();
396 /// Sets up the "extern statics" for this machine.
397 fn init_extern_statics(this: &mut MiriEvalContext<'mir, 'tcx>) -> InterpResult<'tcx> {
398 match this.tcx.sess.target.os.as_ref() {
401 Self::add_extern_static(
404 this.machine.env_vars.environ.unwrap().ptr,
406 // A couple zero-initialized pointer-sized extern statics.
407 // Most of them are for weak symbols, which we all set to null (indicating that the
408 // symbol is not supported, and triggering fallback code which ends up calling a
409 // syscall that we do support).
410 for name in &["__cxa_thread_atexit_impl", "getrandom", "statx", "__clock_gettime64"]
412 let layout = this.machine.layouts.usize;
413 let place = this.allocate(layout, MiriMemoryKind::ExternStatic.into())?;
414 this.write_scalar(Scalar::from_machine_usize(0, this), &place.into())?;
415 Self::add_extern_static(this, name, place.ptr);
420 // This is some obscure hack that is part of the Windows TLS story. It's a `u8`.
421 let layout = this.machine.layouts.u8;
422 let place = this.allocate(layout, MiriMemoryKind::ExternStatic.into())?;
423 this.write_scalar(Scalar::from_u8(0), &place.into())?;
424 Self::add_extern_static(this, "_tls_used", place.ptr);
426 _ => {} // No "extern statics" supported on this target
431 pub(crate) fn communicate(&self) -> bool {
432 self.isolated_op == IsolatedOp::Allow
435 /// Check whether the stack frame that this `FrameInfo` refers to is part of a local crate.
436 pub(crate) fn is_local(&self, frame: &FrameInfo<'_>) -> bool {
437 let def_id = frame.instance.def_id();
438 def_id.is_local() || self.local_crates.contains(&def_id.krate)
442 /// A rustc InterpCx for Miri.
443 pub type MiriEvalContext<'mir, 'tcx> = InterpCx<'mir, 'tcx, Evaluator<'mir, 'tcx>>;
445 /// A little trait that's useful to be inherited by extension traits.
446 pub trait MiriEvalContextExt<'mir, 'tcx> {
447 fn eval_context_ref<'a>(&'a self) -> &'a MiriEvalContext<'mir, 'tcx>;
448 fn eval_context_mut<'a>(&'a mut self) -> &'a mut MiriEvalContext<'mir, 'tcx>;
450 impl<'mir, 'tcx> MiriEvalContextExt<'mir, 'tcx> for MiriEvalContext<'mir, 'tcx> {
452 fn eval_context_ref(&self) -> &MiriEvalContext<'mir, 'tcx> {
456 fn eval_context_mut(&mut self) -> &mut MiriEvalContext<'mir, 'tcx> {
461 /// Machine hook implementations.
462 impl<'mir, 'tcx> Machine<'mir, 'tcx> for Evaluator<'mir, 'tcx> {
463 type MemoryKind = MiriMemoryKind;
464 type ExtraFnVal = Dlsym;
466 type FrameExtra = FrameData<'tcx>;
467 type AllocExtra = AllocExtra;
469 type PointerTag = Tag;
470 type TagExtra = SbTag;
473 MonoHashMap<AllocId, (MemoryKind<MiriMemoryKind>, Allocation<Tag, Self::AllocExtra>)>;
475 const GLOBAL_KIND: Option<MiriMemoryKind> = Some(MiriMemoryKind::Global);
477 const PANIC_ON_ALLOC_FAIL: bool = false;
480 fn enforce_alignment(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
481 ecx.machine.check_alignment != AlignmentCheck::None
485 fn force_int_for_alignment_check(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
486 ecx.machine.check_alignment == AlignmentCheck::Int
490 fn enforce_validity(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
495 fn enforce_number_init(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
496 ecx.machine.enforce_number_validity
500 fn enforce_number_no_provenance(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
501 ecx.machine.enforce_number_validity
505 fn enforce_abi(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
506 ecx.machine.enforce_abi
510 fn find_mir_or_eval_fn(
511 ecx: &mut MiriEvalContext<'mir, 'tcx>,
512 instance: ty::Instance<'tcx>,
514 args: &[OpTy<'tcx, Tag>],
515 ret: Option<(&PlaceTy<'tcx, Tag>, mir::BasicBlock)>,
516 unwind: StackPopUnwind,
517 ) -> InterpResult<'tcx, Option<(&'mir mir::Body<'tcx>, ty::Instance<'tcx>)>> {
518 ecx.find_mir_or_eval_fn(instance, abi, args, ret, unwind)
523 ecx: &mut MiriEvalContext<'mir, 'tcx>,
526 args: &[OpTy<'tcx, Tag>],
527 ret: Option<(&PlaceTy<'tcx, Tag>, mir::BasicBlock)>,
528 _unwind: StackPopUnwind,
529 ) -> InterpResult<'tcx> {
530 ecx.call_dlsym(fn_val, abi, args, ret)
535 ecx: &mut MiriEvalContext<'mir, 'tcx>,
536 instance: ty::Instance<'tcx>,
537 args: &[OpTy<'tcx, Tag>],
538 ret: Option<(&PlaceTy<'tcx, Tag>, mir::BasicBlock)>,
539 unwind: StackPopUnwind,
540 ) -> InterpResult<'tcx> {
541 ecx.call_intrinsic(instance, args, ret, unwind)
546 ecx: &mut MiriEvalContext<'mir, 'tcx>,
547 msg: &mir::AssertMessage<'tcx>,
548 unwind: Option<mir::BasicBlock>,
549 ) -> InterpResult<'tcx> {
550 ecx.assert_panic(msg, unwind)
554 fn abort(_ecx: &mut MiriEvalContext<'mir, 'tcx>, msg: String) -> InterpResult<'tcx, !> {
555 throw_machine_stop!(TerminationInfo::Abort(msg))
560 ecx: &MiriEvalContext<'mir, 'tcx>,
562 left: &ImmTy<'tcx, Tag>,
563 right: &ImmTy<'tcx, Tag>,
564 ) -> InterpResult<'tcx, (Scalar<Tag>, bool, ty::Ty<'tcx>)> {
565 ecx.binary_ptr_op(bin_op, left, right)
568 fn thread_local_static_base_pointer(
569 ecx: &mut MiriEvalContext<'mir, 'tcx>,
571 ) -> InterpResult<'tcx, Pointer<Tag>> {
572 ecx.get_or_create_thread_local_alloc(def_id)
575 fn extern_static_base_pointer(
576 ecx: &MiriEvalContext<'mir, 'tcx>,
578 ) -> InterpResult<'tcx, Pointer<Tag>> {
579 let link_name = ecx.item_link_name(def_id);
580 if let Some(&ptr) = ecx.machine.extern_statics.get(&link_name) {
583 throw_unsup_format!("`extern` static {:?} is not supported by Miri", def_id)
587 fn init_allocation_extra<'b>(
588 ecx: &MiriEvalContext<'mir, 'tcx>,
590 alloc: Cow<'b, Allocation>,
591 kind: Option<MemoryKind<Self::MemoryKind>>,
592 ) -> Cow<'b, Allocation<Self::PointerTag, Self::AllocExtra>> {
593 if ecx.machine.tracked_alloc_ids.contains(&id) {
594 register_diagnostic(NonHaltingDiagnostic::CreatedAlloc(id));
597 let kind = kind.expect("we set our STATIC_KIND so this cannot be None");
598 let alloc = alloc.into_owned();
599 let stacks = if let Some(stacked_borrows) = &ecx.machine.stacked_borrows {
600 Some(Stacks::new_allocation(
605 ecx.machine.current_span(),
610 let race_alloc = if let Some(data_race) = &ecx.machine.data_race {
611 Some(data_race::AllocExtra::new_allocation(data_race, alloc.size(), kind))
615 let alloc: Allocation<Tag, Self::AllocExtra> = alloc.convert_tag_add_extra(
617 AllocExtra { stacked_borrows: stacks, data_race: race_alloc },
618 |ptr| Evaluator::tag_alloc_base_pointer(ecx, ptr),
623 fn tag_alloc_base_pointer(
624 ecx: &MiriEvalContext<'mir, 'tcx>,
625 ptr: Pointer<AllocId>,
627 let absolute_addr = intptrcast::GlobalStateInner::rel_ptr_to_addr(ecx, ptr);
628 let sb_tag = if let Some(stacked_borrows) = &ecx.machine.stacked_borrows {
629 stacked_borrows.borrow_mut().base_tag(ptr.provenance)
634 Tag::Concrete(ConcreteTag { alloc_id: ptr.provenance, sb: sb_tag }),
635 Size::from_bytes(absolute_addr),
640 fn ptr_from_addr_cast(
641 ecx: &MiriEvalContext<'mir, 'tcx>,
643 ) -> Pointer<Option<Self::PointerTag>> {
644 intptrcast::GlobalStateInner::ptr_from_addr_cast(ecx, addr)
648 fn ptr_from_addr_transmute(
649 ecx: &MiriEvalContext<'mir, 'tcx>,
651 ) -> Pointer<Option<Self::PointerTag>> {
652 intptrcast::GlobalStateInner::ptr_from_addr_transmute(ecx, addr)
656 ecx: &mut InterpCx<'mir, 'tcx, Self>,
657 ptr: Pointer<Self::PointerTag>,
658 ) -> InterpResult<'tcx> {
659 match ptr.provenance {
660 Tag::Concrete(concrete) =>
661 intptrcast::GlobalStateInner::expose_addr(ecx, concrete.alloc_id),
663 // No need to do anything for wildcard pointers as
664 // their provenances have already been previously exposed.
670 /// Convert a pointer with provenance into an allocation-offset pair,
671 /// or a `None` with an absolute address if that conversion is not possible.
673 ecx: &MiriEvalContext<'mir, 'tcx>,
674 ptr: Pointer<Self::PointerTag>,
675 ) -> Option<(AllocId, Size, Self::TagExtra)> {
676 let rel = intptrcast::GlobalStateInner::abs_ptr_to_rel(ecx, ptr);
678 rel.map(|(alloc_id, size)| {
679 let sb = match ptr.provenance {
680 Tag::Concrete(ConcreteTag { sb, .. }) => sb,
681 Tag::Wildcard => SbTag::Untagged,
691 alloc_extra: &AllocExtra,
692 (alloc_id, tag): (AllocId, Self::TagExtra),
694 ) -> InterpResult<'tcx> {
695 if let Some(data_race) = &alloc_extra.data_race {
696 data_race.read(alloc_id, range, machine.data_race.as_ref().unwrap())?;
698 if let Some(stacked_borrows) = &alloc_extra.stacked_borrows {
699 stacked_borrows.memory_read(
703 machine.stacked_borrows.as_ref().unwrap(),
704 machine.current_span(),
715 alloc_extra: &mut AllocExtra,
716 (alloc_id, tag): (AllocId, Self::TagExtra),
718 ) -> InterpResult<'tcx> {
719 if let Some(data_race) = &mut alloc_extra.data_race {
720 data_race.write(alloc_id, range, machine.data_race.as_mut().unwrap())?;
722 if let Some(stacked_borrows) = &mut alloc_extra.stacked_borrows {
723 stacked_borrows.memory_written(
727 machine.stacked_borrows.as_ref().unwrap(),
728 machine.current_span(),
736 fn memory_deallocated(
739 alloc_extra: &mut AllocExtra,
740 (alloc_id, tag): (AllocId, Self::TagExtra),
742 ) -> InterpResult<'tcx> {
743 if machine.tracked_alloc_ids.contains(&alloc_id) {
744 register_diagnostic(NonHaltingDiagnostic::FreedAlloc(alloc_id));
746 if let Some(data_race) = &mut alloc_extra.data_race {
747 data_race.deallocate(alloc_id, range, machine.data_race.as_mut().unwrap())?;
749 if let Some(stacked_borrows) = &mut alloc_extra.stacked_borrows {
750 stacked_borrows.memory_deallocated(
754 machine.stacked_borrows.as_ref().unwrap(),
763 ecx: &mut InterpCx<'mir, 'tcx, Self>,
764 kind: mir::RetagKind,
765 place: &PlaceTy<'tcx, Tag>,
766 ) -> InterpResult<'tcx> {
767 if ecx.machine.stacked_borrows.is_some() { ecx.retag(kind, place) } else { Ok(()) }
772 ecx: &mut InterpCx<'mir, 'tcx, Self>,
773 frame: Frame<'mir, 'tcx, Tag>,
774 ) -> InterpResult<'tcx, Frame<'mir, 'tcx, Tag, FrameData<'tcx>>> {
775 // Start recording our event before doing anything else
776 let timing = if let Some(profiler) = ecx.machine.profiler.as_ref() {
777 let fn_name = frame.instance.to_string();
778 let entry = ecx.machine.string_cache.entry(fn_name.clone());
779 let name = entry.or_insert_with(|| profiler.alloc_string(&*fn_name));
781 Some(profiler.start_recording_interval_event_detached(
783 measureme::EventId::from_label(*name),
784 ecx.get_active_thread().to_u32(),
790 let stacked_borrows = ecx.machine.stacked_borrows.as_ref();
791 let call_id = stacked_borrows.map_or(NonZeroU64::new(1).unwrap(), |stacked_borrows| {
792 stacked_borrows.borrow_mut().new_call()
795 let extra = FrameData { call_id, catch_unwind: None, timing };
796 Ok(frame.with_extra(extra))
800 ecx: &'a InterpCx<'mir, 'tcx, Self>,
801 ) -> &'a [Frame<'mir, 'tcx, Self::PointerTag, Self::FrameExtra>] {
802 ecx.active_thread_stack()
806 ecx: &'a mut InterpCx<'mir, 'tcx, Self>,
807 ) -> &'a mut Vec<Frame<'mir, 'tcx, Self::PointerTag, Self::FrameExtra>> {
808 ecx.active_thread_stack_mut()
812 fn after_stack_push(ecx: &mut InterpCx<'mir, 'tcx, Self>) -> InterpResult<'tcx> {
813 if ecx.machine.stacked_borrows.is_some() { ecx.retag_return_place() } else { Ok(()) }
818 ecx: &mut InterpCx<'mir, 'tcx, Self>,
819 mut frame: Frame<'mir, 'tcx, Tag, FrameData<'tcx>>,
821 ) -> InterpResult<'tcx, StackPopJump> {
822 let timing = frame.extra.timing.take();
823 let res = ecx.handle_stack_pop(frame.extra, unwinding);
824 if let Some(profiler) = ecx.machine.profiler.as_ref() {
825 profiler.finish_recording_interval_event(timing.unwrap());