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;
32 concurrency::{data_race, weak_memory},
33 shims::unix::FileHandler,
37 // Some global facts about the emulated machine.
38 pub const PAGE_SIZE: u64 = 4 * 1024; // FIXME: adjust to target architecture
39 pub const STACK_ADDR: u64 = 32 * PAGE_SIZE; // not really about the "stack", but where we start assigning integer addresses to allocations
40 pub const STACK_SIZE: u64 = 16 * PAGE_SIZE; // whatever
41 pub const NUM_CPUS: u64 = 1;
43 /// Extra data stored with each stack frame
44 pub struct FrameData<'tcx> {
45 /// Extra data for Stacked Borrows.
46 pub call_id: stacked_borrows::CallId,
48 /// If this is Some(), then this is a special "catch unwind" frame (the frame of `try_fn`
49 /// called by `try`). When this frame is popped during unwinding a panic,
50 /// we stop unwinding, use the `CatchUnwindData` to handle catching.
51 pub catch_unwind: Option<CatchUnwindData<'tcx>>,
53 /// If `measureme` profiling is enabled, holds timing information
54 /// for the start of this frame. When we finish executing this frame,
55 /// we use this to register a completed event with `measureme`.
56 pub timing: Option<measureme::DetachedTiming>,
59 impl<'tcx> std::fmt::Debug for FrameData<'tcx> {
60 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
61 // Omitting `timing`, it does not support `Debug`.
62 let FrameData { call_id, catch_unwind, timing: _ } = self;
63 f.debug_struct("FrameData")
64 .field("call_id", call_id)
65 .field("catch_unwind", catch_unwind)
70 /// Extra memory kinds
71 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
72 pub enum MiriMemoryKind {
73 /// `__rust_alloc` memory.
77 /// Windows `HeapAlloc` memory.
79 /// Memory for args, errno, and other parts of the machine-managed environment.
80 /// This memory may leak.
82 /// Memory allocated by the runtime (e.g. env vars). Separate from `Machine`
83 /// because we clean it up and leak-check it.
85 /// Globals copied from `tcx`.
86 /// This memory may leak.
88 /// Memory for extern statics.
89 /// This memory may leak.
91 /// Memory for thread-local statics.
92 /// This memory may leak.
96 impl From<MiriMemoryKind> for MemoryKind<MiriMemoryKind> {
98 fn from(kind: MiriMemoryKind) -> MemoryKind<MiriMemoryKind> {
99 MemoryKind::Machine(kind)
103 impl MayLeak for MiriMemoryKind {
105 fn may_leak(self) -> bool {
106 use self::MiriMemoryKind::*;
108 Rust | C | WinHeap | Runtime => false,
109 Machine | Global | ExternStatic | Tls => true,
114 impl fmt::Display for MiriMemoryKind {
115 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
116 use self::MiriMemoryKind::*;
118 Rust => write!(f, "Rust heap"),
119 C => write!(f, "C heap"),
120 WinHeap => write!(f, "Windows heap"),
121 Machine => write!(f, "machine-managed memory"),
122 Runtime => write!(f, "language runtime memory"),
123 Global => write!(f, "global (static or const)"),
124 ExternStatic => write!(f, "extern static"),
125 Tls => write!(f, "thread-local static"),
130 /// Pointer provenance (tag).
131 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
135 /// Stacked Borrows tag.
141 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
142 static_assert_size!(Pointer<Tag>, 24);
143 // FIXME: this would with in 24bytes but layout optimizations are not smart enough
144 // #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
145 //static_assert_size!(Pointer<Option<Tag>>, 24);
146 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
147 static_assert_size!(ScalarMaybeUninit<Tag>, 32);
149 impl Provenance for Tag {
150 /// We use absolute addresses in the `offset` of a `Pointer<Tag>`.
151 const OFFSET_IS_ADDR: bool = true;
153 /// We cannot err on partial overwrites, it happens too often in practice (due to unions).
154 const ERR_ON_PARTIAL_PTR_OVERWRITE: bool = false;
156 fn fmt(ptr: &Pointer<Self>, f: &mut fmt::Formatter<'_>) -> fmt::Result {
157 let (tag, addr) = ptr.into_parts(); // address is absolute
158 write!(f, "0x{:x}", addr.bytes())?;
161 Tag::Concrete { alloc_id, sb } => {
162 // Forward `alternate` flag to `alloc_id` printing.
164 write!(f, "[{:#?}]", alloc_id)?;
166 write!(f, "[{:?}]", alloc_id)?;
168 // Print Stacked Borrows tag.
169 write!(f, "{:?}", sb)?;
172 write!(f, "[Wildcard]")?;
179 fn get_alloc_id(self) -> Option<AllocId> {
181 Tag::Concrete { alloc_id, .. } => Some(alloc_id),
182 Tag::Wildcard => None,
187 /// Extra per-allocation data
188 #[derive(Debug, Clone)]
189 pub struct AllocExtra {
190 /// Stacked Borrows state is only added if it is enabled.
191 pub stacked_borrows: Option<stacked_borrows::AllocExtra>,
192 /// Data race detection via the use of a vector-clock,
193 /// this is only added if it is enabled.
194 pub data_race: Option<data_race::AllocExtra>,
195 /// Weak memory emulation via the use of store buffers,
196 /// this is only added if it is enabled.
197 pub weak_memory: Option<weak_memory::AllocExtra>,
200 /// Precomputed layouts of primitive types
201 pub struct PrimitiveLayouts<'tcx> {
202 pub unit: TyAndLayout<'tcx>,
203 pub i8: TyAndLayout<'tcx>,
204 pub i16: TyAndLayout<'tcx>,
205 pub i32: TyAndLayout<'tcx>,
206 pub isize: TyAndLayout<'tcx>,
207 pub u8: TyAndLayout<'tcx>,
208 pub u16: TyAndLayout<'tcx>,
209 pub u32: TyAndLayout<'tcx>,
210 pub usize: TyAndLayout<'tcx>,
211 pub bool: TyAndLayout<'tcx>,
212 pub mut_raw_ptr: TyAndLayout<'tcx>,
215 impl<'mir, 'tcx: 'mir> PrimitiveLayouts<'tcx> {
216 fn new(layout_cx: LayoutCx<'tcx, TyCtxt<'tcx>>) -> Result<Self, LayoutError<'tcx>> {
217 let tcx = layout_cx.tcx;
218 let mut_raw_ptr = tcx.mk_ptr(TypeAndMut { ty: tcx.types.unit, mutbl: Mutability::Mut });
220 unit: layout_cx.layout_of(tcx.mk_unit())?,
221 i8: layout_cx.layout_of(tcx.types.i8)?,
222 i16: layout_cx.layout_of(tcx.types.i16)?,
223 i32: layout_cx.layout_of(tcx.types.i32)?,
224 isize: layout_cx.layout_of(tcx.types.isize)?,
225 u8: layout_cx.layout_of(tcx.types.u8)?,
226 u16: layout_cx.layout_of(tcx.types.u16)?,
227 u32: layout_cx.layout_of(tcx.types.u32)?,
228 usize: layout_cx.layout_of(tcx.types.usize)?,
229 bool: layout_cx.layout_of(tcx.types.bool)?,
230 mut_raw_ptr: layout_cx.layout_of(mut_raw_ptr)?,
235 /// The machine itself.
236 pub struct Evaluator<'mir, 'tcx> {
237 pub stacked_borrows: Option<stacked_borrows::GlobalState>,
238 pub data_race: Option<data_race::GlobalState>,
239 pub intptrcast: intptrcast::GlobalState,
241 /// Environment variables set by `setenv`.
242 /// Miri does not expose env vars from the host to the emulated program.
243 pub(crate) env_vars: EnvVars<'tcx>,
245 /// Program arguments (`Option` because we can only initialize them after creating the ecx).
246 /// These are *pointers* to argc/argv because macOS.
247 /// We also need the full command line as one string because of Windows.
248 pub(crate) argc: Option<MemPlace<Tag>>,
249 pub(crate) argv: Option<MemPlace<Tag>>,
250 pub(crate) cmd_line: Option<MemPlace<Tag>>,
253 pub(crate) tls: TlsData<'tcx>,
255 /// What should Miri do when an op requires communicating with the host,
256 /// such as accessing host env vars, random number generation, and
257 /// file system access.
258 pub(crate) isolated_op: IsolatedOp,
260 /// Whether to enforce the validity invariant.
261 pub(crate) validate: bool,
263 /// Whether to allow uninitialized numbers (integers and floats).
264 pub(crate) allow_uninit_numbers: bool,
266 /// Whether to allow ptr2int transmutes, and whether to allow *dereferencing* the result of an
267 /// int2ptr transmute.
268 pub(crate) allow_ptr_int_transmute: bool,
270 /// Whether to enforce [ABI](Abi) of function calls.
271 pub(crate) enforce_abi: bool,
273 /// The table of file descriptors.
274 pub(crate) file_handler: shims::unix::FileHandler,
275 /// The table of directory descriptors.
276 pub(crate) dir_handler: shims::unix::DirHandler,
278 /// The "time anchor" for this machine's monotone clock (for `Instant` simulation).
279 pub(crate) time_anchor: Instant,
281 /// The set of threads.
282 pub(crate) threads: ThreadManager<'mir, 'tcx>,
284 /// Precomputed `TyLayout`s for primitive data types that are commonly used inside Miri.
285 pub(crate) layouts: PrimitiveLayouts<'tcx>,
287 /// Allocations that are considered roots of static memory (that may leak).
288 pub(crate) static_roots: Vec<AllocId>,
290 /// The `measureme` profiler used to record timing information about
291 /// the emulated program.
292 profiler: Option<measureme::Profiler>,
293 /// Used with `profiler` to cache the `StringId`s for event names
294 /// uesd with `measureme`.
295 string_cache: FxHashMap<String, measureme::StringId>,
297 /// Cache of `Instance` exported under the given `Symbol` name.
298 /// `None` means no `Instance` exported under the given name is found.
299 pub(crate) exported_symbols_cache: FxHashMap<Symbol, Option<Instance<'tcx>>>,
301 /// Whether to raise a panic in the context of the evaluated process when unsupported
302 /// functionality is encountered. If `false`, an error is propagated in the Miri application context
303 /// instead (default behavior)
304 pub(crate) panic_on_unsupported: bool,
306 /// Equivalent setting as RUST_BACKTRACE on encountering an error.
307 pub(crate) backtrace_style: BacktraceStyle,
309 /// Crates which are considered local for the purposes of error reporting.
310 pub(crate) local_crates: Vec<CrateNum>,
312 /// Mapping extern static names to their base pointer.
313 extern_statics: FxHashMap<Symbol, Pointer<Tag>>,
315 /// The random number generator used for resolving non-determinism.
316 /// Needs to be queried by ptr_to_int, hence needs interior mutability.
317 pub(crate) rng: RefCell<StdRng>,
319 /// The allocation IDs to report when they are being allocated
320 /// (helps for debugging memory leaks and use after free bugs).
321 tracked_alloc_ids: HashSet<AllocId>,
323 /// Controls whether alignment of memory accesses is being checked.
324 pub(crate) check_alignment: AlignmentCheck,
326 /// Failure rate of compare_exchange_weak, between 0.0 and 1.0
327 pub(crate) cmpxchg_weak_failure_rate: f64,
329 /// Corresponds to -Zmiri-mute-stdout-stderr and doesn't write the output but acts as if it succeeded.
330 pub(crate) mute_stdout_stderr: bool,
332 /// Whether weak memory emulation is enabled
333 pub(crate) weak_memory: bool,
335 /// The probability of the active thread being preempted at the end of each basic block.
336 pub(crate) preemption_rate: f64,
338 /// If `Some`, we will report the current stack every N basic blocks.
339 pub(crate) report_progress: Option<u32>,
340 /// The number of blocks that passed since the last progress report.
341 pub(crate) since_progress_report: u32,
344 impl<'mir, 'tcx> Evaluator<'mir, 'tcx> {
345 pub(crate) fn new(config: &MiriConfig, layout_cx: LayoutCx<'tcx, TyCtxt<'tcx>>) -> Self {
346 let local_crates = helpers::get_local_crates(layout_cx.tcx);
348 PrimitiveLayouts::new(layout_cx).expect("Couldn't get layouts of primitive types");
349 let profiler = config.measureme_out.as_ref().map(|out| {
350 measureme::Profiler::new(out).expect("Couldn't create `measureme` profiler")
352 let rng = StdRng::seed_from_u64(config.seed.unwrap_or(0));
353 let stacked_borrows = if config.stacked_borrows {
354 Some(RefCell::new(stacked_borrows::GlobalStateInner::new(
355 config.tracked_pointer_tags.clone(),
356 config.tracked_call_ids.clone(),
363 if config.data_race_detector { Some(data_race::GlobalState::new()) } else { None };
367 intptrcast: RefCell::new(intptrcast::GlobalStateInner::new(config)),
368 // `env_vars` depends on a full interpreter so we cannot properly initialize it yet.
369 env_vars: EnvVars::default(),
373 tls: TlsData::default(),
374 isolated_op: config.isolated_op,
375 validate: config.validate,
376 allow_uninit_numbers: config.allow_uninit_numbers,
377 allow_ptr_int_transmute: config.allow_ptr_int_transmute,
378 enforce_abi: config.check_abi,
379 file_handler: FileHandler::new(config.mute_stdout_stderr),
380 dir_handler: Default::default(),
381 time_anchor: Instant::now(),
383 threads: ThreadManager::default(),
384 static_roots: Vec::new(),
386 string_cache: Default::default(),
387 exported_symbols_cache: FxHashMap::default(),
388 panic_on_unsupported: config.panic_on_unsupported,
389 backtrace_style: config.backtrace_style,
391 extern_statics: FxHashMap::default(),
392 rng: RefCell::new(rng),
393 tracked_alloc_ids: config.tracked_alloc_ids.clone(),
394 check_alignment: config.check_alignment,
395 cmpxchg_weak_failure_rate: config.cmpxchg_weak_failure_rate,
396 mute_stdout_stderr: config.mute_stdout_stderr,
397 weak_memory: config.weak_memory_emulation,
398 preemption_rate: config.preemption_rate,
399 report_progress: config.report_progress,
400 since_progress_report: 0,
404 pub(crate) fn late_init(
405 this: &mut MiriEvalContext<'mir, 'tcx>,
407 ) -> InterpResult<'tcx> {
408 EnvVars::init(this, config)?;
409 Evaluator::init_extern_statics(this)?;
413 fn add_extern_static(
414 this: &mut MiriEvalContext<'mir, 'tcx>,
416 ptr: Pointer<Option<Tag>>,
418 // This got just allocated, so there definitely is a pointer here.
419 let ptr = ptr.into_pointer_or_addr().unwrap();
420 this.machine.extern_statics.try_insert(Symbol::intern(name), ptr).unwrap();
423 /// Sets up the "extern statics" for this machine.
424 fn init_extern_statics(this: &mut MiriEvalContext<'mir, 'tcx>) -> InterpResult<'tcx> {
425 match this.tcx.sess.target.os.as_ref() {
428 Self::add_extern_static(
431 this.machine.env_vars.environ.unwrap().ptr,
433 // A couple zero-initialized pointer-sized extern statics.
434 // Most of them are for weak symbols, which we all set to null (indicating that the
435 // symbol is not supported, and triggering fallback code which ends up calling a
436 // syscall that we do support).
437 for name in &["__cxa_thread_atexit_impl", "getrandom", "statx", "__clock_gettime64"]
439 let layout = this.machine.layouts.usize;
440 let place = this.allocate(layout, MiriMemoryKind::ExternStatic.into())?;
441 this.write_scalar(Scalar::from_machine_usize(0, this), &place.into())?;
442 Self::add_extern_static(this, name, place.ptr);
447 // This is some obscure hack that is part of the Windows TLS story. It's a `u8`.
448 let layout = this.machine.layouts.u8;
449 let place = this.allocate(layout, MiriMemoryKind::ExternStatic.into())?;
450 this.write_scalar(Scalar::from_u8(0), &place.into())?;
451 Self::add_extern_static(this, "_tls_used", place.ptr);
453 _ => {} // No "extern statics" supported on this target
458 pub(crate) fn communicate(&self) -> bool {
459 self.isolated_op == IsolatedOp::Allow
462 /// Check whether the stack frame that this `FrameInfo` refers to is part of a local crate.
463 pub(crate) fn is_local(&self, frame: &FrameInfo<'_>) -> bool {
464 let def_id = frame.instance.def_id();
465 def_id.is_local() || self.local_crates.contains(&def_id.krate)
469 /// A rustc InterpCx for Miri.
470 pub type MiriEvalContext<'mir, 'tcx> = InterpCx<'mir, 'tcx, Evaluator<'mir, 'tcx>>;
472 /// A little trait that's useful to be inherited by extension traits.
473 pub trait MiriEvalContextExt<'mir, 'tcx> {
474 fn eval_context_ref<'a>(&'a self) -> &'a MiriEvalContext<'mir, 'tcx>;
475 fn eval_context_mut<'a>(&'a mut self) -> &'a mut MiriEvalContext<'mir, 'tcx>;
477 impl<'mir, 'tcx> MiriEvalContextExt<'mir, 'tcx> for MiriEvalContext<'mir, 'tcx> {
479 fn eval_context_ref(&self) -> &MiriEvalContext<'mir, 'tcx> {
483 fn eval_context_mut(&mut self) -> &mut MiriEvalContext<'mir, 'tcx> {
488 /// Machine hook implementations.
489 impl<'mir, 'tcx> Machine<'mir, 'tcx> for Evaluator<'mir, 'tcx> {
490 type MemoryKind = MiriMemoryKind;
491 type ExtraFnVal = Dlsym;
493 type FrameExtra = FrameData<'tcx>;
494 type AllocExtra = AllocExtra;
496 type PointerTag = Tag;
497 type TagExtra = SbTagExtra;
500 MonoHashMap<AllocId, (MemoryKind<MiriMemoryKind>, Allocation<Tag, Self::AllocExtra>)>;
502 const GLOBAL_KIND: Option<MiriMemoryKind> = Some(MiriMemoryKind::Global);
504 const PANIC_ON_ALLOC_FAIL: bool = false;
507 fn enforce_alignment(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
508 ecx.machine.check_alignment != AlignmentCheck::None
512 fn force_int_for_alignment_check(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
513 ecx.machine.check_alignment == AlignmentCheck::Int
517 fn enforce_validity(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
522 fn enforce_number_init(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
523 !ecx.machine.allow_uninit_numbers
527 fn enforce_number_no_provenance(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
528 !ecx.machine.allow_ptr_int_transmute
532 fn enforce_abi(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
533 ecx.machine.enforce_abi
537 fn find_mir_or_eval_fn(
538 ecx: &mut MiriEvalContext<'mir, 'tcx>,
539 instance: ty::Instance<'tcx>,
541 args: &[OpTy<'tcx, Tag>],
542 dest: &PlaceTy<'tcx, Tag>,
543 ret: Option<mir::BasicBlock>,
544 unwind: StackPopUnwind,
545 ) -> InterpResult<'tcx, Option<(&'mir mir::Body<'tcx>, ty::Instance<'tcx>)>> {
546 ecx.find_mir_or_eval_fn(instance, abi, args, dest, ret, unwind)
551 ecx: &mut MiriEvalContext<'mir, 'tcx>,
554 args: &[OpTy<'tcx, Tag>],
555 dest: &PlaceTy<'tcx, Tag>,
556 ret: Option<mir::BasicBlock>,
557 _unwind: StackPopUnwind,
558 ) -> InterpResult<'tcx> {
559 ecx.call_dlsym(fn_val, abi, args, dest, ret)
564 ecx: &mut MiriEvalContext<'mir, 'tcx>,
565 instance: ty::Instance<'tcx>,
566 args: &[OpTy<'tcx, Tag>],
567 dest: &PlaceTy<'tcx, Tag>,
568 ret: Option<mir::BasicBlock>,
569 unwind: StackPopUnwind,
570 ) -> InterpResult<'tcx> {
571 ecx.call_intrinsic(instance, args, dest, ret, unwind)
576 ecx: &mut MiriEvalContext<'mir, 'tcx>,
577 msg: &mir::AssertMessage<'tcx>,
578 unwind: Option<mir::BasicBlock>,
579 ) -> InterpResult<'tcx> {
580 ecx.assert_panic(msg, unwind)
584 fn abort(_ecx: &mut MiriEvalContext<'mir, 'tcx>, msg: String) -> InterpResult<'tcx, !> {
585 throw_machine_stop!(TerminationInfo::Abort(msg))
590 ecx: &MiriEvalContext<'mir, 'tcx>,
592 left: &ImmTy<'tcx, Tag>,
593 right: &ImmTy<'tcx, Tag>,
594 ) -> InterpResult<'tcx, (Scalar<Tag>, bool, ty::Ty<'tcx>)> {
595 ecx.binary_ptr_op(bin_op, left, right)
598 fn thread_local_static_base_pointer(
599 ecx: &mut MiriEvalContext<'mir, 'tcx>,
601 ) -> InterpResult<'tcx, Pointer<Tag>> {
602 ecx.get_or_create_thread_local_alloc(def_id)
605 fn extern_static_base_pointer(
606 ecx: &MiriEvalContext<'mir, 'tcx>,
608 ) -> InterpResult<'tcx, Pointer<Tag>> {
609 let link_name = ecx.item_link_name(def_id);
610 if let Some(&ptr) = ecx.machine.extern_statics.get(&link_name) {
614 "`extern` static `{}` from crate `{}` is not supported by Miri",
615 ecx.tcx.def_path_str(def_id),
616 ecx.tcx.crate_name(def_id.krate),
621 fn init_allocation_extra<'b>(
622 ecx: &MiriEvalContext<'mir, 'tcx>,
624 alloc: Cow<'b, Allocation>,
625 kind: Option<MemoryKind<Self::MemoryKind>>,
626 ) -> InterpResult<'tcx, Cow<'b, Allocation<Self::PointerTag, Self::AllocExtra>>> {
627 let kind = kind.expect("we set our STATIC_KIND so this cannot be None");
628 if ecx.machine.tracked_alloc_ids.contains(&id) {
629 register_diagnostic(NonHaltingDiagnostic::CreatedAlloc(
637 let alloc = alloc.into_owned();
638 let stacks = if let Some(stacked_borrows) = &ecx.machine.stacked_borrows {
639 Some(Stacks::new_allocation(
644 ecx.machine.current_span(),
649 let race_alloc = if let Some(data_race) = &ecx.machine.data_race {
650 Some(data_race::AllocExtra::new_allocation(data_race, alloc.size(), kind))
654 let buffer_alloc = if ecx.machine.weak_memory {
655 Some(weak_memory::AllocExtra::new_allocation())
659 let alloc: Allocation<Tag, Self::AllocExtra> = alloc.convert_tag_add_extra(
662 stacked_borrows: stacks.map(RefCell::new),
663 data_race: race_alloc,
664 weak_memory: buffer_alloc,
666 |ptr| ecx.global_base_pointer(ptr),
668 Ok(Cow::Owned(alloc))
671 fn tag_alloc_base_pointer(
672 ecx: &MiriEvalContext<'mir, 'tcx>,
673 ptr: Pointer<AllocId>,
675 if cfg!(debug_assertions) {
676 // The machine promises to never call us on thread-local or extern statics.
677 let alloc_id = ptr.provenance;
678 match ecx.tcx.get_global_alloc(alloc_id) {
679 Some(GlobalAlloc::Static(def_id)) if ecx.tcx.is_thread_local_static(def_id) => {
680 panic!("tag_alloc_base_pointer called on thread-local static")
682 Some(GlobalAlloc::Static(def_id)) if ecx.tcx.is_foreign_item(def_id) => {
683 panic!("tag_alloc_base_pointer called on extern static")
688 let absolute_addr = intptrcast::GlobalStateInner::rel_ptr_to_addr(ecx, ptr);
689 let sb_tag = if let Some(stacked_borrows) = &ecx.machine.stacked_borrows {
690 stacked_borrows.borrow_mut().base_ptr_tag(ptr.provenance)
692 // Value does not matter, SB is disabled
696 Tag::Concrete { alloc_id: ptr.provenance, sb: sb_tag },
697 Size::from_bytes(absolute_addr),
702 fn ptr_from_addr_cast(
703 ecx: &MiriEvalContext<'mir, 'tcx>,
705 ) -> InterpResult<'tcx, Pointer<Option<Self::PointerTag>>> {
706 intptrcast::GlobalStateInner::ptr_from_addr_cast(ecx, addr)
710 fn ptr_from_addr_transmute(
711 ecx: &MiriEvalContext<'mir, 'tcx>,
713 ) -> Pointer<Option<Self::PointerTag>> {
714 intptrcast::GlobalStateInner::ptr_from_addr_transmute(ecx, addr)
718 ecx: &mut InterpCx<'mir, 'tcx, Self>,
719 ptr: Pointer<Self::PointerTag>,
720 ) -> InterpResult<'tcx> {
721 match ptr.provenance {
722 Tag::Concrete { alloc_id, sb } => {
723 intptrcast::GlobalStateInner::expose_ptr(ecx, alloc_id, sb);
726 // No need to do anything for wildcard pointers as
727 // their provenances have already been previously exposed.
733 /// Convert a pointer with provenance into an allocation-offset pair,
734 /// or a `None` with an absolute address if that conversion is not possible.
736 ecx: &MiriEvalContext<'mir, 'tcx>,
737 ptr: Pointer<Self::PointerTag>,
738 ) -> Option<(AllocId, Size, Self::TagExtra)> {
739 let rel = intptrcast::GlobalStateInner::abs_ptr_to_rel(ecx, ptr);
741 rel.map(|(alloc_id, size)| {
742 let sb = match ptr.provenance {
743 Tag::Concrete { sb, .. } => SbTagExtra::Concrete(sb),
744 Tag::Wildcard => SbTagExtra::Wildcard,
754 alloc_extra: &AllocExtra,
755 (alloc_id, tag): (AllocId, Self::TagExtra),
757 ) -> InterpResult<'tcx> {
758 if let Some(data_race) = &alloc_extra.data_race {
759 data_race.read(alloc_id, range, machine.data_race.as_ref().unwrap())?;
761 if let Some(stacked_borrows) = &alloc_extra.stacked_borrows {
762 stacked_borrows.borrow_mut().memory_read(
766 machine.stacked_borrows.as_ref().unwrap(),
767 machine.current_span(),
770 if let Some(weak_memory) = &alloc_extra.weak_memory {
771 weak_memory.memory_accessed(range, machine.data_race.as_ref().unwrap());
780 alloc_extra: &mut AllocExtra,
781 (alloc_id, tag): (AllocId, Self::TagExtra),
783 ) -> InterpResult<'tcx> {
784 if let Some(data_race) = &mut alloc_extra.data_race {
785 data_race.write(alloc_id, range, machine.data_race.as_mut().unwrap())?;
787 if let Some(stacked_borrows) = &mut alloc_extra.stacked_borrows {
788 stacked_borrows.get_mut().memory_written(
792 machine.stacked_borrows.as_ref().unwrap(),
793 machine.current_span(),
796 if let Some(weak_memory) = &alloc_extra.weak_memory {
797 weak_memory.memory_accessed(range, machine.data_race.as_ref().unwrap());
803 fn memory_deallocated(
806 alloc_extra: &mut AllocExtra,
807 (alloc_id, tag): (AllocId, Self::TagExtra),
809 ) -> InterpResult<'tcx> {
810 if machine.tracked_alloc_ids.contains(&alloc_id) {
811 register_diagnostic(NonHaltingDiagnostic::FreedAlloc(alloc_id));
813 if let Some(data_race) = &mut alloc_extra.data_race {
814 data_race.deallocate(alloc_id, range, machine.data_race.as_mut().unwrap())?;
816 if let Some(stacked_borrows) = &mut alloc_extra.stacked_borrows {
817 stacked_borrows.get_mut().memory_deallocated(
821 machine.stacked_borrows.as_ref().unwrap(),
830 ecx: &mut InterpCx<'mir, 'tcx, Self>,
831 kind: mir::RetagKind,
832 place: &PlaceTy<'tcx, Tag>,
833 ) -> InterpResult<'tcx> {
834 if ecx.machine.stacked_borrows.is_some() { ecx.retag(kind, place) } else { Ok(()) }
839 ecx: &mut InterpCx<'mir, 'tcx, Self>,
840 frame: Frame<'mir, 'tcx, Tag>,
841 ) -> InterpResult<'tcx, Frame<'mir, 'tcx, Tag, FrameData<'tcx>>> {
842 // Start recording our event before doing anything else
843 let timing = if let Some(profiler) = ecx.machine.profiler.as_ref() {
844 let fn_name = frame.instance.to_string();
845 let entry = ecx.machine.string_cache.entry(fn_name.clone());
846 let name = entry.or_insert_with(|| profiler.alloc_string(&*fn_name));
848 Some(profiler.start_recording_interval_event_detached(
850 measureme::EventId::from_label(*name),
851 ecx.get_active_thread().to_u32(),
857 let stacked_borrows = ecx.machine.stacked_borrows.as_ref();
858 let call_id = stacked_borrows.map_or(NonZeroU64::new(1).unwrap(), |stacked_borrows| {
859 stacked_borrows.borrow_mut().new_call()
862 let extra = FrameData { call_id, catch_unwind: None, timing };
863 Ok(frame.with_extra(extra))
867 ecx: &'a InterpCx<'mir, 'tcx, Self>,
868 ) -> &'a [Frame<'mir, 'tcx, Self::PointerTag, Self::FrameExtra>] {
869 ecx.active_thread_stack()
873 ecx: &'a mut InterpCx<'mir, 'tcx, Self>,
874 ) -> &'a mut Vec<Frame<'mir, 'tcx, Self::PointerTag, Self::FrameExtra>> {
875 ecx.active_thread_stack_mut()
878 fn before_terminator(ecx: &mut InterpCx<'mir, 'tcx, Self>) -> InterpResult<'tcx> {
879 // Possibly report our progress.
880 if let Some(report_progress) = ecx.machine.report_progress {
881 if ecx.machine.since_progress_report >= report_progress {
882 register_diagnostic(NonHaltingDiagnostic::ProgressReport);
883 ecx.machine.since_progress_report = 0;
885 // Cannot overflow, since it is strictly less than `report_progress`.
886 ecx.machine.since_progress_report += 1;
888 // These are our preemption points.
889 ecx.maybe_preempt_active_thread();
894 fn after_stack_push(ecx: &mut InterpCx<'mir, 'tcx, Self>) -> InterpResult<'tcx> {
895 if ecx.machine.stacked_borrows.is_some() { ecx.retag_return_place() } else { Ok(()) }
900 ecx: &mut InterpCx<'mir, 'tcx, Self>,
901 mut frame: Frame<'mir, 'tcx, Tag, FrameData<'tcx>>,
903 ) -> InterpResult<'tcx, StackPopJump> {
904 let timing = frame.extra.timing.take();
905 let res = ecx.handle_stack_pop(frame.extra, unwinding);
906 if let Some(profiler) = ecx.machine.profiler.as_ref() {
907 profiler.finish_recording_interval_event(timing.unwrap());