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;
10 use rand::rngs::StdRng;
11 use rand::SeedableRng;
13 use rustc_ast::ast::Mutability;
14 use rustc_data_structures::fx::FxHashMap;
19 layout::{LayoutCx, LayoutError, LayoutOf, TyAndLayout},
20 Instance, TyCtxt, TypeAndMut,
23 use rustc_span::def_id::{CrateNum, DefId};
24 use rustc_span::symbol::{sym, Symbol};
25 use rustc_target::abi::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 let FrameData { call_id, catch_unwind, timing: _ } = self;
56 f.debug_struct("FrameData")
57 .field("call_id", call_id)
58 .field("catch_unwind", catch_unwind)
63 /// Extra memory kinds
64 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
65 pub enum MiriMemoryKind {
66 /// `__rust_alloc` memory.
70 /// Windows `HeapAlloc` memory.
72 /// Memory for args, errno, and other parts of the machine-managed environment.
73 /// This memory may leak.
75 /// Memory allocated by the runtime (e.g. env vars). Separate from `Machine`
76 /// because we clean it up and leak-check it.
78 /// Globals copied from `tcx`.
79 /// This memory may leak.
81 /// Memory for extern statics.
82 /// This memory may leak.
84 /// Memory for thread-local statics.
85 /// This memory may leak.
89 impl Into<MemoryKind<MiriMemoryKind>> for MiriMemoryKind {
91 fn into(self) -> MemoryKind<MiriMemoryKind> {
92 MemoryKind::Machine(self)
96 impl MayLeak for MiriMemoryKind {
98 fn may_leak(self) -> bool {
99 use self::MiriMemoryKind::*;
101 Rust | C | WinHeap | Runtime => false,
102 Machine | Global | ExternStatic | Tls => true,
107 impl fmt::Display for MiriMemoryKind {
108 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
109 use self::MiriMemoryKind::*;
111 Rust => write!(f, "Rust heap"),
112 C => write!(f, "C heap"),
113 WinHeap => write!(f, "Windows heap"),
114 Machine => write!(f, "machine-managed memory"),
115 Runtime => write!(f, "language runtime memory"),
116 Global => write!(f, "global (static or const)"),
117 ExternStatic => write!(f, "extern static"),
118 Tls => write!(f, "thread-local static"),
123 /// Pointer provenance (tag).
124 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
126 pub alloc_id: AllocId,
127 /// Stacked Borrows tag.
131 impl Provenance for Tag {
132 /// We use absolute addresses in the `offset` of a `Pointer<Tag>`.
133 const OFFSET_IS_ADDR: bool = true;
135 /// We cannot err on partial overwrites, it happens too often in practice (due to unions).
136 const ERR_ON_PARTIAL_PTR_OVERWRITE: bool = false;
138 fn fmt(ptr: &Pointer<Self>, f: &mut fmt::Formatter<'_>) -> fmt::Result {
139 let (tag, addr) = ptr.into_parts(); // address is absolute
140 write!(f, "0x{:x}", addr.bytes())?;
141 // Forward `alternate` flag to `alloc_id` printing.
143 write!(f, "[{:#?}]", tag.alloc_id)?;
145 write!(f, "[{:?}]", tag.alloc_id)?;
147 // Print Stacked Borrows tag.
148 write!(f, "{:?}", tag.sb)
151 fn get_alloc_id(self) -> AllocId {
156 /// Extra per-allocation data
157 #[derive(Debug, Clone)]
158 pub struct AllocExtra {
159 /// Stacked Borrows state is only added if it is enabled.
160 pub stacked_borrows: Option<stacked_borrows::AllocExtra>,
161 /// Data race detection via the use of a vector-clock,
162 /// this is only added if it is enabled.
163 pub data_race: Option<data_race::AllocExtra>,
166 /// Precomputed layouts of primitive types
167 pub struct PrimitiveLayouts<'tcx> {
168 pub unit: TyAndLayout<'tcx>,
169 pub i8: TyAndLayout<'tcx>,
170 pub i32: TyAndLayout<'tcx>,
171 pub isize: TyAndLayout<'tcx>,
172 pub u8: TyAndLayout<'tcx>,
173 pub u32: TyAndLayout<'tcx>,
174 pub usize: TyAndLayout<'tcx>,
175 pub bool: TyAndLayout<'tcx>,
176 pub mut_raw_ptr: TyAndLayout<'tcx>,
179 impl<'mir, 'tcx: 'mir> PrimitiveLayouts<'tcx> {
180 fn new(layout_cx: LayoutCx<'tcx, TyCtxt<'tcx>>) -> Result<Self, LayoutError<'tcx>> {
181 let tcx = layout_cx.tcx;
182 let mut_raw_ptr = tcx.mk_ptr(TypeAndMut { ty: tcx.types.unit, mutbl: Mutability::Mut });
184 unit: layout_cx.layout_of(tcx.mk_unit())?,
185 i8: layout_cx.layout_of(tcx.types.i8)?,
186 i32: layout_cx.layout_of(tcx.types.i32)?,
187 isize: layout_cx.layout_of(tcx.types.isize)?,
188 u8: layout_cx.layout_of(tcx.types.u8)?,
189 u32: layout_cx.layout_of(tcx.types.u32)?,
190 usize: layout_cx.layout_of(tcx.types.usize)?,
191 bool: layout_cx.layout_of(tcx.types.bool)?,
192 mut_raw_ptr: layout_cx.layout_of(mut_raw_ptr)?,
197 /// The machine itself.
198 pub struct Evaluator<'mir, 'tcx> {
199 pub stacked_borrows: Option<stacked_borrows::GlobalState>,
200 pub data_race: Option<data_race::GlobalState>,
201 pub intptrcast: intptrcast::GlobalState,
203 /// Environment variables set by `setenv`.
204 /// Miri does not expose env vars from the host to the emulated program.
205 pub(crate) env_vars: EnvVars<'tcx>,
207 /// Program arguments (`Option` because we can only initialize them after creating the ecx).
208 /// These are *pointers* to argc/argv because macOS.
209 /// We also need the full command line as one string because of Windows.
210 pub(crate) argc: Option<MemPlace<Tag>>,
211 pub(crate) argv: Option<MemPlace<Tag>>,
212 pub(crate) cmd_line: Option<MemPlace<Tag>>,
215 pub(crate) tls: TlsData<'tcx>,
217 /// What should Miri do when an op requires communicating with the host,
218 /// such as accessing host env vars, random number generation, and
219 /// file system access.
220 pub(crate) isolated_op: IsolatedOp,
222 /// Whether to enforce the validity invariant.
223 pub(crate) validate: bool,
225 /// Whether to enforce validity (e.g., initialization) of integers and floats.
226 pub(crate) enforce_number_validity: bool,
228 /// Whether to enforce [ABI](Abi) of function calls.
229 pub(crate) enforce_abi: bool,
231 pub(crate) file_handler: shims::posix::FileHandler,
232 pub(crate) dir_handler: shims::posix::DirHandler,
234 /// The "time anchor" for this machine's monotone clock (for `Instant` simulation).
235 pub(crate) time_anchor: Instant,
237 /// The set of threads.
238 pub(crate) threads: ThreadManager<'mir, 'tcx>,
240 /// Precomputed `TyLayout`s for primitive data types that are commonly used inside Miri.
241 pub(crate) layouts: PrimitiveLayouts<'tcx>,
243 /// Allocations that are considered roots of static memory (that may leak).
244 pub(crate) static_roots: Vec<AllocId>,
246 /// The `measureme` profiler used to record timing information about
247 /// the emulated program.
248 profiler: Option<measureme::Profiler>,
249 /// Used with `profiler` to cache the `StringId`s for event names
250 /// uesd with `measureme`.
251 string_cache: FxHashMap<String, measureme::StringId>,
253 /// Cache of `Instance` exported under the given `Symbol` name.
254 /// `None` means no `Instance` exported under the given name is found.
255 pub(crate) exported_symbols_cache: FxHashMap<Symbol, Option<Instance<'tcx>>>,
257 /// Whether to raise a panic in the context of the evaluated process when unsupported
258 /// functionality is encountered. If `false`, an error is propagated in the Miri application context
259 /// instead (default behavior)
260 pub(crate) panic_on_unsupported: bool,
262 /// Equivalent setting as RUST_BACKTRACE on encountering an error.
263 pub(crate) backtrace_style: BacktraceStyle,
265 /// Crates which are considered local for the purposes of error reporting.
266 pub(crate) local_crates: Vec<CrateNum>,
268 /// Mapping extern static names to their base pointer.
269 extern_statics: FxHashMap<Symbol, Pointer<Tag>>,
271 /// The random number generator used for resolving non-determinism.
272 /// Needs to be queried by ptr_to_int, hence needs interior mutability.
273 pub(crate) rng: RefCell<StdRng>,
275 /// An allocation ID to report when it is being allocated
276 /// (helps for debugging memory leaks and use after free bugs).
277 tracked_alloc_id: Option<AllocId>,
279 /// Controls whether alignment of memory accesses is being checked.
280 pub(crate) check_alignment: AlignmentCheck,
282 /// Failure rate of compare_exchange_weak, between 0.0 and 1.0
283 pub(crate) cmpxchg_weak_failure_rate: f64,
286 impl<'mir, 'tcx> Evaluator<'mir, 'tcx> {
287 pub(crate) fn new(config: &MiriConfig, layout_cx: LayoutCx<'tcx, TyCtxt<'tcx>>) -> Self {
288 let local_crates = helpers::get_local_crates(&layout_cx.tcx);
290 PrimitiveLayouts::new(layout_cx).expect("Couldn't get layouts of primitive types");
291 let profiler = config.measureme_out.as_ref().map(|out| {
292 measureme::Profiler::new(out).expect("Couldn't create `measureme` profiler")
294 let rng = StdRng::seed_from_u64(config.seed.unwrap_or(0));
295 let stacked_borrows = if config.stacked_borrows {
296 Some(RefCell::new(stacked_borrows::GlobalStateInner::new(
297 config.tracked_pointer_tag,
298 config.tracked_call_id,
305 if config.data_race_detector { Some(data_race::GlobalState::new()) } else { None };
309 intptrcast: RefCell::new(intptrcast::GlobalStateInner::new(config)),
310 // `env_vars` depends on a full interpreter so we cannot properly initialize it yet.
311 env_vars: EnvVars::default(),
315 tls: TlsData::default(),
316 isolated_op: config.isolated_op,
317 validate: config.validate,
318 enforce_number_validity: config.check_number_validity,
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(),
329 panic_on_unsupported: config.panic_on_unsupported,
330 backtrace_style: config.backtrace_style,
332 extern_statics: FxHashMap::default(),
333 rng: RefCell::new(rng),
334 tracked_alloc_id: config.tracked_alloc_id,
335 check_alignment: config.check_alignment,
336 cmpxchg_weak_failure_rate: config.cmpxchg_weak_failure_rate,
340 pub(crate) fn late_init(
341 this: &mut MiriEvalContext<'mir, 'tcx>,
343 ) -> InterpResult<'tcx> {
344 EnvVars::init(this, config)?;
345 Evaluator::init_extern_statics(this)?;
349 fn add_extern_static(
350 this: &mut MiriEvalContext<'mir, 'tcx>,
352 ptr: Pointer<Option<Tag>>,
354 let ptr = ptr.into_pointer_or_addr().unwrap();
355 this.machine.extern_statics.try_insert(Symbol::intern(name), ptr).unwrap();
358 /// Sets up the "extern statics" for this machine.
359 fn init_extern_statics(this: &mut MiriEvalContext<'mir, 'tcx>) -> InterpResult<'tcx> {
360 match this.tcx.sess.target.os.as_ref() {
363 Self::add_extern_static(
366 this.machine.env_vars.environ.unwrap().ptr,
368 // A couple zero-initialized pointer-sized extern statics.
369 // Most of them are for weak symbols, which we all set to null (indicating that the
370 // symbol is not supported, and triggering fallback code which ends up calling a
371 // syscall that we do support).
372 for name in &["__cxa_thread_atexit_impl", "getrandom", "statx"] {
373 let layout = this.machine.layouts.usize;
374 let place = this.allocate(layout, MiriMemoryKind::ExternStatic.into())?;
375 this.write_scalar(Scalar::from_machine_usize(0, this), &place.into())?;
376 Self::add_extern_static(this, name, place.ptr);
381 // This is some obscure hack that is part of the Windows TLS story. It's a `u8`.
382 let layout = this.machine.layouts.u8;
383 let place = this.allocate(layout, MiriMemoryKind::ExternStatic.into())?;
384 this.write_scalar(Scalar::from_u8(0), &place.into())?;
385 Self::add_extern_static(this, "_tls_used", place.ptr);
387 _ => {} // No "extern statics" supported on this target
392 pub(crate) fn communicate(&self) -> bool {
393 self.isolated_op == IsolatedOp::Allow
396 /// Check whether the stack frame that this `FrameInfo` refers to is part of a local crate.
397 pub(crate) fn is_local(&self, frame: &FrameInfo<'_>) -> bool {
398 let def_id = frame.instance.def_id();
399 def_id.is_local() || self.local_crates.contains(&def_id.krate)
403 /// A rustc InterpCx for Miri.
404 pub type MiriEvalContext<'mir, 'tcx> = InterpCx<'mir, 'tcx, Evaluator<'mir, 'tcx>>;
406 /// A little trait that's useful to be inherited by extension traits.
407 pub trait MiriEvalContextExt<'mir, 'tcx> {
408 fn eval_context_ref<'a>(&'a self) -> &'a MiriEvalContext<'mir, 'tcx>;
409 fn eval_context_mut<'a>(&'a mut self) -> &'a mut MiriEvalContext<'mir, 'tcx>;
411 impl<'mir, 'tcx> MiriEvalContextExt<'mir, 'tcx> for MiriEvalContext<'mir, 'tcx> {
413 fn eval_context_ref(&self) -> &MiriEvalContext<'mir, 'tcx> {
417 fn eval_context_mut(&mut self) -> &mut MiriEvalContext<'mir, 'tcx> {
422 /// Machine hook implementations.
423 impl<'mir, 'tcx> Machine<'mir, 'tcx> for Evaluator<'mir, 'tcx> {
424 type MemoryKind = MiriMemoryKind;
426 type FrameExtra = FrameData<'tcx>;
427 type AllocExtra = AllocExtra;
428 type PointerTag = Tag;
429 type ExtraFnVal = Dlsym;
432 MonoHashMap<AllocId, (MemoryKind<MiriMemoryKind>, Allocation<Tag, Self::AllocExtra>)>;
434 const GLOBAL_KIND: Option<MiriMemoryKind> = Some(MiriMemoryKind::Global);
436 const PANIC_ON_ALLOC_FAIL: bool = false;
439 fn enforce_alignment(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
440 ecx.machine.check_alignment != AlignmentCheck::None
444 fn force_int_for_alignment_check(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
445 ecx.machine.check_alignment == AlignmentCheck::Int
449 fn enforce_validity(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
454 fn enforce_number_validity(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
455 ecx.machine.enforce_number_validity
459 fn enforce_abi(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
460 ecx.machine.enforce_abi
464 fn find_mir_or_eval_fn(
465 ecx: &mut MiriEvalContext<'mir, 'tcx>,
466 instance: ty::Instance<'tcx>,
468 args: &[OpTy<'tcx, Tag>],
469 ret: Option<(&PlaceTy<'tcx, Tag>, mir::BasicBlock)>,
470 unwind: StackPopUnwind,
471 ) -> InterpResult<'tcx, Option<(&'mir mir::Body<'tcx>, ty::Instance<'tcx>)>> {
472 ecx.find_mir_or_eval_fn(instance, abi, args, ret, unwind)
477 ecx: &mut MiriEvalContext<'mir, 'tcx>,
480 args: &[OpTy<'tcx, Tag>],
481 ret: Option<(&PlaceTy<'tcx, Tag>, mir::BasicBlock)>,
482 _unwind: StackPopUnwind,
483 ) -> InterpResult<'tcx> {
484 ecx.call_dlsym(fn_val, abi, args, ret)
489 ecx: &mut MiriEvalContext<'mir, 'tcx>,
490 instance: ty::Instance<'tcx>,
491 args: &[OpTy<'tcx, Tag>],
492 ret: Option<(&PlaceTy<'tcx, Tag>, mir::BasicBlock)>,
493 unwind: StackPopUnwind,
494 ) -> InterpResult<'tcx> {
495 ecx.call_intrinsic(instance, args, ret, unwind)
500 ecx: &mut MiriEvalContext<'mir, 'tcx>,
501 msg: &mir::AssertMessage<'tcx>,
502 unwind: Option<mir::BasicBlock>,
503 ) -> InterpResult<'tcx> {
504 ecx.assert_panic(msg, unwind)
508 fn abort(_ecx: &mut MiriEvalContext<'mir, 'tcx>, msg: String) -> InterpResult<'tcx, !> {
509 throw_machine_stop!(TerminationInfo::Abort(msg))
514 ecx: &MiriEvalContext<'mir, 'tcx>,
516 left: &ImmTy<'tcx, Tag>,
517 right: &ImmTy<'tcx, Tag>,
518 ) -> InterpResult<'tcx, (Scalar<Tag>, bool, ty::Ty<'tcx>)> {
519 ecx.binary_ptr_op(bin_op, left, right)
522 fn thread_local_static_base_pointer(
523 ecx: &mut MiriEvalContext<'mir, 'tcx>,
525 ) -> InterpResult<'tcx, Pointer<Tag>> {
526 ecx.get_or_create_thread_local_alloc(def_id)
529 fn extern_static_base_pointer(
530 ecx: &MiriEvalContext<'mir, 'tcx>,
532 ) -> InterpResult<'tcx, Pointer<Tag>> {
533 let attrs = ecx.tcx.get_attrs(def_id);
534 let link_name = match ecx.tcx.sess.first_attr_value_str_by_name(&attrs, sym::link_name) {
536 None => ecx.tcx.item_name(def_id),
538 if let Some(&ptr) = ecx.machine.extern_statics.get(&link_name) {
541 throw_unsup_format!("`extern` static {:?} is not supported by Miri", def_id)
545 fn init_allocation_extra<'b>(
546 ecx: &MiriEvalContext<'mir, 'tcx>,
548 alloc: Cow<'b, Allocation>,
549 kind: Option<MemoryKind<Self::MemoryKind>>,
550 ) -> Cow<'b, Allocation<Self::PointerTag, Self::AllocExtra>> {
551 if Some(id) == ecx.machine.tracked_alloc_id {
552 register_diagnostic(NonHaltingDiagnostic::CreatedAlloc(id));
555 let kind = kind.expect("we set our STATIC_KIND so this cannot be None");
556 let alloc = alloc.into_owned();
557 let stacks = if let Some(stacked_borrows) = &ecx.machine.stacked_borrows {
558 Some(Stacks::new_allocation(id, alloc.size(), stacked_borrows, kind))
562 let race_alloc = if let Some(data_race) = &ecx.machine.data_race {
563 Some(data_race::AllocExtra::new_allocation(&data_race, alloc.size(), kind))
567 let alloc: Allocation<Tag, Self::AllocExtra> = alloc.convert_tag_add_extra(
569 AllocExtra { stacked_borrows: stacks, data_race: race_alloc },
570 |ptr| Evaluator::tag_alloc_base_pointer(ecx, ptr),
575 fn tag_alloc_base_pointer(
576 ecx: &MiriEvalContext<'mir, 'tcx>,
577 ptr: Pointer<AllocId>,
579 let absolute_addr = intptrcast::GlobalStateInner::rel_ptr_to_addr(ecx, ptr);
580 let sb_tag = if let Some(stacked_borrows) = &ecx.machine.stacked_borrows {
581 stacked_borrows.borrow_mut().base_tag(ptr.provenance)
585 Pointer::new(Tag { alloc_id: ptr.provenance, sb: sb_tag }, Size::from_bytes(absolute_addr))
590 ecx: &MiriEvalContext<'mir, 'tcx>,
592 ) -> Pointer<Option<Self::PointerTag>> {
593 intptrcast::GlobalStateInner::ptr_from_addr(addr, ecx)
596 /// Convert a pointer with provenance into an allocation-offset pair,
597 /// or a `None` with an absolute address if that conversion is not possible.
599 ecx: &MiriEvalContext<'mir, 'tcx>,
600 ptr: Pointer<Self::PointerTag>,
601 ) -> (AllocId, Size) {
602 let rel = intptrcast::GlobalStateInner::abs_ptr_to_rel(ecx, ptr);
603 (ptr.provenance.alloc_id, rel)
610 alloc_extra: &AllocExtra,
613 ) -> InterpResult<'tcx> {
614 if let Some(data_race) = &alloc_extra.data_race {
615 data_race.read(tag.alloc_id, range, machine.data_race.as_ref().unwrap())?;
617 if let Some(stacked_borrows) = &alloc_extra.stacked_borrows {
618 stacked_borrows.memory_read(
622 machine.stacked_borrows.as_ref().unwrap(),
633 alloc_extra: &mut AllocExtra,
636 ) -> InterpResult<'tcx> {
637 if let Some(data_race) = &mut alloc_extra.data_race {
638 data_race.write(tag.alloc_id, range, machine.data_race.as_mut().unwrap())?;
640 if let Some(stacked_borrows) = &mut alloc_extra.stacked_borrows {
641 stacked_borrows.memory_written(
645 machine.stacked_borrows.as_mut().unwrap(),
653 fn memory_deallocated(
656 alloc_extra: &mut AllocExtra,
659 ) -> InterpResult<'tcx> {
660 if Some(tag.alloc_id) == machine.tracked_alloc_id {
661 register_diagnostic(NonHaltingDiagnostic::FreedAlloc(tag.alloc_id));
663 if let Some(data_race) = &mut alloc_extra.data_race {
664 data_race.deallocate(tag.alloc_id, range, machine.data_race.as_mut().unwrap())?;
666 if let Some(stacked_borrows) = &mut alloc_extra.stacked_borrows {
667 stacked_borrows.memory_deallocated(
671 machine.stacked_borrows.as_mut().unwrap(),
680 ecx: &mut InterpCx<'mir, 'tcx, Self>,
681 kind: mir::RetagKind,
682 place: &PlaceTy<'tcx, Tag>,
683 ) -> InterpResult<'tcx> {
684 if ecx.machine.stacked_borrows.is_some() { ecx.retag(kind, place) } else { Ok(()) }
689 ecx: &mut InterpCx<'mir, 'tcx, Self>,
690 frame: Frame<'mir, 'tcx, Tag>,
691 ) -> InterpResult<'tcx, Frame<'mir, 'tcx, Tag, FrameData<'tcx>>> {
692 // Start recording our event before doing anything else
693 let timing = if let Some(profiler) = ecx.machine.profiler.as_ref() {
694 let fn_name = frame.instance.to_string();
695 let entry = ecx.machine.string_cache.entry(fn_name.clone());
696 let name = entry.or_insert_with(|| profiler.alloc_string(&*fn_name));
698 Some(profiler.start_recording_interval_event_detached(
700 measureme::EventId::from_label(*name),
701 ecx.get_active_thread().to_u32(),
707 let stacked_borrows = ecx.machine.stacked_borrows.as_ref();
708 let call_id = stacked_borrows.map_or(NonZeroU64::new(1).unwrap(), |stacked_borrows| {
709 stacked_borrows.borrow_mut().new_call()
712 let extra = FrameData { call_id, catch_unwind: None, timing };
713 Ok(frame.with_extra(extra))
717 ecx: &'a InterpCx<'mir, 'tcx, Self>,
718 ) -> &'a [Frame<'mir, 'tcx, Self::PointerTag, Self::FrameExtra>] {
719 ecx.active_thread_stack()
723 ecx: &'a mut InterpCx<'mir, 'tcx, Self>,
724 ) -> &'a mut Vec<Frame<'mir, 'tcx, Self::PointerTag, Self::FrameExtra>> {
725 ecx.active_thread_stack_mut()
729 fn after_stack_push(ecx: &mut InterpCx<'mir, 'tcx, Self>) -> InterpResult<'tcx> {
730 if ecx.machine.stacked_borrows.is_some() { ecx.retag_return_place() } else { Ok(()) }
735 ecx: &mut InterpCx<'mir, 'tcx, Self>,
736 mut frame: Frame<'mir, 'tcx, Tag, FrameData<'tcx>>,
738 ) -> InterpResult<'tcx, StackPopJump> {
739 let timing = frame.extra.timing.take();
740 let res = ecx.handle_stack_pop(frame.extra, unwinding);
741 if let Some(profiler) = ecx.machine.profiler.as_ref() {
742 profiler.finish_recording_interval_event(timing.unwrap());