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 // #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
144 // static_assert_size!(Pointer<Option<Tag>>, 24);
145 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
146 static_assert_size!(ScalarMaybeUninit<Tag>, 32);
148 impl Provenance for Tag {
149 /// We use absolute addresses in the `offset` of a `Pointer<Tag>`.
150 const OFFSET_IS_ADDR: bool = true;
152 /// We cannot err on partial overwrites, it happens too often in practice (due to unions).
153 const ERR_ON_PARTIAL_PTR_OVERWRITE: bool = false;
155 fn fmt(ptr: &Pointer<Self>, f: &mut fmt::Formatter<'_>) -> fmt::Result {
156 let (tag, addr) = ptr.into_parts(); // address is absolute
157 write!(f, "0x{:x}", addr.bytes())?;
160 Tag::Concrete { alloc_id, sb } => {
161 // Forward `alternate` flag to `alloc_id` printing.
163 write!(f, "[{:#?}]", alloc_id)?;
165 write!(f, "[{:?}]", alloc_id)?;
167 // Print Stacked Borrows tag.
168 write!(f, "{:?}", sb)?;
171 write!(f, "[Wildcard]")?;
178 fn get_alloc_id(self) -> Option<AllocId> {
180 Tag::Concrete { alloc_id, .. } => Some(alloc_id),
181 Tag::Wildcard => None,
186 /// Extra per-allocation data
187 #[derive(Debug, Clone)]
188 pub struct AllocExtra {
189 /// Stacked Borrows state is only added if it is enabled.
190 pub stacked_borrows: Option<stacked_borrows::AllocExtra>,
191 /// Data race detection via the use of a vector-clock,
192 /// this is only added if it is enabled.
193 pub data_race: Option<data_race::AllocExtra>,
194 /// Weak memory emulation via the use of store buffers,
195 /// this is only added if it is enabled.
196 pub weak_memory: Option<weak_memory::AllocExtra>,
199 /// Precomputed layouts of primitive types
200 pub struct PrimitiveLayouts<'tcx> {
201 pub unit: TyAndLayout<'tcx>,
202 pub i8: TyAndLayout<'tcx>,
203 pub i16: TyAndLayout<'tcx>,
204 pub i32: TyAndLayout<'tcx>,
205 pub isize: TyAndLayout<'tcx>,
206 pub u8: TyAndLayout<'tcx>,
207 pub u16: TyAndLayout<'tcx>,
208 pub u32: TyAndLayout<'tcx>,
209 pub usize: TyAndLayout<'tcx>,
210 pub bool: TyAndLayout<'tcx>,
211 pub mut_raw_ptr: TyAndLayout<'tcx>,
214 impl<'mir, 'tcx: 'mir> PrimitiveLayouts<'tcx> {
215 fn new(layout_cx: LayoutCx<'tcx, TyCtxt<'tcx>>) -> Result<Self, LayoutError<'tcx>> {
216 let tcx = layout_cx.tcx;
217 let mut_raw_ptr = tcx.mk_ptr(TypeAndMut { ty: tcx.types.unit, mutbl: Mutability::Mut });
219 unit: layout_cx.layout_of(tcx.mk_unit())?,
220 i8: layout_cx.layout_of(tcx.types.i8)?,
221 i16: layout_cx.layout_of(tcx.types.i16)?,
222 i32: layout_cx.layout_of(tcx.types.i32)?,
223 isize: layout_cx.layout_of(tcx.types.isize)?,
224 u8: layout_cx.layout_of(tcx.types.u8)?,
225 u16: layout_cx.layout_of(tcx.types.u16)?,
226 u32: layout_cx.layout_of(tcx.types.u32)?,
227 usize: layout_cx.layout_of(tcx.types.usize)?,
228 bool: layout_cx.layout_of(tcx.types.bool)?,
229 mut_raw_ptr: layout_cx.layout_of(mut_raw_ptr)?,
234 /// The machine itself.
235 pub struct Evaluator<'mir, 'tcx> {
236 pub stacked_borrows: Option<stacked_borrows::GlobalState>,
237 pub data_race: Option<data_race::GlobalState>,
238 pub intptrcast: intptrcast::GlobalState,
240 /// Environment variables set by `setenv`.
241 /// Miri does not expose env vars from the host to the emulated program.
242 pub(crate) env_vars: EnvVars<'tcx>,
244 /// Program arguments (`Option` because we can only initialize them after creating the ecx).
245 /// These are *pointers* to argc/argv because macOS.
246 /// We also need the full command line as one string because of Windows.
247 pub(crate) argc: Option<MemPlace<Tag>>,
248 pub(crate) argv: Option<MemPlace<Tag>>,
249 pub(crate) cmd_line: Option<MemPlace<Tag>>,
252 pub(crate) tls: TlsData<'tcx>,
254 /// What should Miri do when an op requires communicating with the host,
255 /// such as accessing host env vars, random number generation, and
256 /// file system access.
257 pub(crate) isolated_op: IsolatedOp,
259 /// Whether to enforce the validity invariant.
260 pub(crate) validate: bool,
262 /// Whether to allow uninitialized numbers (integers and floats).
263 pub(crate) allow_uninit_numbers: bool,
265 /// Whether to allow ptr2int transmutes, and whether to allow *dereferencing* the result of an
266 /// int2ptr transmute.
267 pub(crate) allow_ptr_int_transmute: bool,
269 /// Whether to enforce [ABI](Abi) of function calls.
270 pub(crate) enforce_abi: bool,
272 /// The table of file descriptors.
273 pub(crate) file_handler: shims::unix::FileHandler,
274 /// The table of directory descriptors.
275 pub(crate) dir_handler: shims::unix::DirHandler,
277 /// The "time anchor" for this machine's monotone clock (for `Instant` simulation).
278 pub(crate) time_anchor: Instant,
280 /// The set of threads.
281 pub(crate) threads: ThreadManager<'mir, 'tcx>,
283 /// Precomputed `TyLayout`s for primitive data types that are commonly used inside Miri.
284 pub(crate) layouts: PrimitiveLayouts<'tcx>,
286 /// Allocations that are considered roots of static memory (that may leak).
287 pub(crate) static_roots: Vec<AllocId>,
289 /// The `measureme` profiler used to record timing information about
290 /// the emulated program.
291 profiler: Option<measureme::Profiler>,
292 /// Used with `profiler` to cache the `StringId`s for event names
293 /// uesd with `measureme`.
294 string_cache: FxHashMap<String, measureme::StringId>,
296 /// Cache of `Instance` exported under the given `Symbol` name.
297 /// `None` means no `Instance` exported under the given name is found.
298 pub(crate) exported_symbols_cache: FxHashMap<Symbol, Option<Instance<'tcx>>>,
300 /// Whether to raise a panic in the context of the evaluated process when unsupported
301 /// functionality is encountered. If `false`, an error is propagated in the Miri application context
302 /// instead (default behavior)
303 pub(crate) panic_on_unsupported: bool,
305 /// Equivalent setting as RUST_BACKTRACE on encountering an error.
306 pub(crate) backtrace_style: BacktraceStyle,
308 /// Crates which are considered local for the purposes of error reporting.
309 pub(crate) local_crates: Vec<CrateNum>,
311 /// Mapping extern static names to their base pointer.
312 extern_statics: FxHashMap<Symbol, Pointer<Tag>>,
314 /// The random number generator used for resolving non-determinism.
315 /// Needs to be queried by ptr_to_int, hence needs interior mutability.
316 pub(crate) rng: RefCell<StdRng>,
318 /// The allocation IDs to report when they are being allocated
319 /// (helps for debugging memory leaks and use after free bugs).
320 tracked_alloc_ids: HashSet<AllocId>,
322 /// Controls whether alignment of memory accesses is being checked.
323 pub(crate) check_alignment: AlignmentCheck,
325 /// Failure rate of compare_exchange_weak, between 0.0 and 1.0
326 pub(crate) cmpxchg_weak_failure_rate: f64,
328 /// Corresponds to -Zmiri-mute-stdout-stderr and doesn't write the output but acts as if it succeeded.
329 pub(crate) mute_stdout_stderr: bool,
331 /// Whether weak memory emulation is enabled
332 pub(crate) weak_memory: bool,
334 /// The probability of the active thread being preempted at the end of each basic block.
335 pub(crate) preemption_rate: f64,
338 impl<'mir, 'tcx> Evaluator<'mir, 'tcx> {
339 pub(crate) fn new(config: &MiriConfig, layout_cx: LayoutCx<'tcx, TyCtxt<'tcx>>) -> Self {
340 let local_crates = helpers::get_local_crates(layout_cx.tcx);
342 PrimitiveLayouts::new(layout_cx).expect("Couldn't get layouts of primitive types");
343 let profiler = config.measureme_out.as_ref().map(|out| {
344 measureme::Profiler::new(out).expect("Couldn't create `measureme` profiler")
346 let rng = StdRng::seed_from_u64(config.seed.unwrap_or(0));
347 let stacked_borrows = if config.stacked_borrows {
348 Some(RefCell::new(stacked_borrows::GlobalStateInner::new(
349 config.tracked_pointer_tags.clone(),
350 config.tracked_call_ids.clone(),
357 if config.data_race_detector { Some(data_race::GlobalState::new()) } else { None };
361 intptrcast: RefCell::new(intptrcast::GlobalStateInner::new(config)),
362 // `env_vars` depends on a full interpreter so we cannot properly initialize it yet.
363 env_vars: EnvVars::default(),
367 tls: TlsData::default(),
368 isolated_op: config.isolated_op,
369 validate: config.validate,
370 allow_uninit_numbers: config.allow_uninit_numbers,
371 allow_ptr_int_transmute: config.allow_ptr_int_transmute,
372 enforce_abi: config.check_abi,
373 file_handler: FileHandler::new(config.mute_stdout_stderr),
374 dir_handler: Default::default(),
375 time_anchor: Instant::now(),
377 threads: ThreadManager::default(),
378 static_roots: Vec::new(),
380 string_cache: Default::default(),
381 exported_symbols_cache: FxHashMap::default(),
382 panic_on_unsupported: config.panic_on_unsupported,
383 backtrace_style: config.backtrace_style,
385 extern_statics: FxHashMap::default(),
386 rng: RefCell::new(rng),
387 tracked_alloc_ids: config.tracked_alloc_ids.clone(),
388 check_alignment: config.check_alignment,
389 cmpxchg_weak_failure_rate: config.cmpxchg_weak_failure_rate,
390 mute_stdout_stderr: config.mute_stdout_stderr,
391 weak_memory: config.weak_memory_emulation,
392 preemption_rate: config.preemption_rate,
396 pub(crate) fn late_init(
397 this: &mut MiriEvalContext<'mir, 'tcx>,
399 ) -> InterpResult<'tcx> {
400 EnvVars::init(this, config)?;
401 Evaluator::init_extern_statics(this)?;
405 fn add_extern_static(
406 this: &mut MiriEvalContext<'mir, 'tcx>,
408 ptr: Pointer<Option<Tag>>,
410 // This got just allocated, so there definitely is a pointer here.
411 let ptr = ptr.into_pointer_or_addr().unwrap();
412 this.machine.extern_statics.try_insert(Symbol::intern(name), ptr).unwrap();
415 /// Sets up the "extern statics" for this machine.
416 fn init_extern_statics(this: &mut MiriEvalContext<'mir, 'tcx>) -> InterpResult<'tcx> {
417 match this.tcx.sess.target.os.as_ref() {
420 Self::add_extern_static(
423 this.machine.env_vars.environ.unwrap().ptr,
425 // A couple zero-initialized pointer-sized extern statics.
426 // Most of them are for weak symbols, which we all set to null (indicating that the
427 // symbol is not supported, and triggering fallback code which ends up calling a
428 // syscall that we do support).
429 for name in &["__cxa_thread_atexit_impl", "getrandom", "statx", "__clock_gettime64"]
431 let layout = this.machine.layouts.usize;
432 let place = this.allocate(layout, MiriMemoryKind::ExternStatic.into())?;
433 this.write_scalar(Scalar::from_machine_usize(0, this), &place.into())?;
434 Self::add_extern_static(this, name, place.ptr);
439 // This is some obscure hack that is part of the Windows TLS story. It's a `u8`.
440 let layout = this.machine.layouts.u8;
441 let place = this.allocate(layout, MiriMemoryKind::ExternStatic.into())?;
442 this.write_scalar(Scalar::from_u8(0), &place.into())?;
443 Self::add_extern_static(this, "_tls_used", place.ptr);
445 _ => {} // No "extern statics" supported on this target
450 pub(crate) fn communicate(&self) -> bool {
451 self.isolated_op == IsolatedOp::Allow
454 /// Check whether the stack frame that this `FrameInfo` refers to is part of a local crate.
455 pub(crate) fn is_local(&self, frame: &FrameInfo<'_>) -> bool {
456 let def_id = frame.instance.def_id();
457 def_id.is_local() || self.local_crates.contains(&def_id.krate)
461 /// A rustc InterpCx for Miri.
462 pub type MiriEvalContext<'mir, 'tcx> = InterpCx<'mir, 'tcx, Evaluator<'mir, 'tcx>>;
464 /// A little trait that's useful to be inherited by extension traits.
465 pub trait MiriEvalContextExt<'mir, 'tcx> {
466 fn eval_context_ref<'a>(&'a self) -> &'a MiriEvalContext<'mir, 'tcx>;
467 fn eval_context_mut<'a>(&'a mut self) -> &'a mut MiriEvalContext<'mir, 'tcx>;
469 impl<'mir, 'tcx> MiriEvalContextExt<'mir, 'tcx> for MiriEvalContext<'mir, 'tcx> {
471 fn eval_context_ref(&self) -> &MiriEvalContext<'mir, 'tcx> {
475 fn eval_context_mut(&mut self) -> &mut MiriEvalContext<'mir, 'tcx> {
480 /// Machine hook implementations.
481 impl<'mir, 'tcx> Machine<'mir, 'tcx> for Evaluator<'mir, 'tcx> {
482 type MemoryKind = MiriMemoryKind;
483 type ExtraFnVal = Dlsym;
485 type FrameExtra = FrameData<'tcx>;
486 type AllocExtra = AllocExtra;
488 type PointerTag = Tag;
489 type TagExtra = SbTagExtra;
492 MonoHashMap<AllocId, (MemoryKind<MiriMemoryKind>, Allocation<Tag, Self::AllocExtra>)>;
494 const GLOBAL_KIND: Option<MiriMemoryKind> = Some(MiriMemoryKind::Global);
496 const PANIC_ON_ALLOC_FAIL: bool = false;
499 fn enforce_alignment(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
500 ecx.machine.check_alignment != AlignmentCheck::None
504 fn force_int_for_alignment_check(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
505 ecx.machine.check_alignment == AlignmentCheck::Int
509 fn enforce_validity(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
514 fn enforce_number_init(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
515 !ecx.machine.allow_uninit_numbers
519 fn enforce_number_no_provenance(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
520 !ecx.machine.allow_ptr_int_transmute
524 fn enforce_abi(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
525 ecx.machine.enforce_abi
529 fn find_mir_or_eval_fn(
530 ecx: &mut MiriEvalContext<'mir, 'tcx>,
531 instance: ty::Instance<'tcx>,
533 args: &[OpTy<'tcx, Tag>],
534 dest: &PlaceTy<'tcx, Tag>,
535 ret: Option<mir::BasicBlock>,
536 unwind: StackPopUnwind,
537 ) -> InterpResult<'tcx, Option<(&'mir mir::Body<'tcx>, ty::Instance<'tcx>)>> {
538 ecx.find_mir_or_eval_fn(instance, abi, args, dest, ret, unwind)
543 ecx: &mut MiriEvalContext<'mir, 'tcx>,
546 args: &[OpTy<'tcx, Tag>],
547 dest: &PlaceTy<'tcx, Tag>,
548 ret: Option<mir::BasicBlock>,
549 _unwind: StackPopUnwind,
550 ) -> InterpResult<'tcx> {
551 ecx.call_dlsym(fn_val, abi, args, dest, ret)
556 ecx: &mut MiriEvalContext<'mir, 'tcx>,
557 instance: ty::Instance<'tcx>,
558 args: &[OpTy<'tcx, Tag>],
559 dest: &PlaceTy<'tcx, Tag>,
560 ret: Option<mir::BasicBlock>,
561 unwind: StackPopUnwind,
562 ) -> InterpResult<'tcx> {
563 ecx.call_intrinsic(instance, args, dest, ret, unwind)
568 ecx: &mut MiriEvalContext<'mir, 'tcx>,
569 msg: &mir::AssertMessage<'tcx>,
570 unwind: Option<mir::BasicBlock>,
571 ) -> InterpResult<'tcx> {
572 ecx.assert_panic(msg, unwind)
576 fn abort(_ecx: &mut MiriEvalContext<'mir, 'tcx>, msg: String) -> InterpResult<'tcx, !> {
577 throw_machine_stop!(TerminationInfo::Abort(msg))
582 ecx: &MiriEvalContext<'mir, 'tcx>,
584 left: &ImmTy<'tcx, Tag>,
585 right: &ImmTy<'tcx, Tag>,
586 ) -> InterpResult<'tcx, (Scalar<Tag>, bool, ty::Ty<'tcx>)> {
587 ecx.binary_ptr_op(bin_op, left, right)
590 fn thread_local_static_base_pointer(
591 ecx: &mut MiriEvalContext<'mir, 'tcx>,
593 ) -> InterpResult<'tcx, Pointer<Tag>> {
594 ecx.get_or_create_thread_local_alloc(def_id)
597 fn extern_static_base_pointer(
598 ecx: &MiriEvalContext<'mir, 'tcx>,
600 ) -> InterpResult<'tcx, Pointer<Tag>> {
601 let link_name = ecx.item_link_name(def_id);
602 if let Some(&ptr) = ecx.machine.extern_statics.get(&link_name) {
606 "`extern` static `{}` from crate `{}` is not supported by Miri",
607 ecx.tcx.def_path_str(def_id),
608 ecx.tcx.crate_name(def_id.krate),
613 fn init_allocation_extra<'b>(
614 ecx: &MiriEvalContext<'mir, 'tcx>,
616 alloc: Cow<'b, Allocation>,
617 kind: Option<MemoryKind<Self::MemoryKind>>,
618 ) -> InterpResult<'tcx, Cow<'b, Allocation<Self::PointerTag, Self::AllocExtra>>> {
619 if ecx.machine.tracked_alloc_ids.contains(&id) {
620 register_diagnostic(NonHaltingDiagnostic::CreatedAlloc(id));
623 let kind = kind.expect("we set our STATIC_KIND so this cannot be None");
624 let alloc = alloc.into_owned();
625 let stacks = if let Some(stacked_borrows) = &ecx.machine.stacked_borrows {
626 Some(Stacks::new_allocation(
631 ecx.machine.current_span(),
636 let race_alloc = if let Some(data_race) = &ecx.machine.data_race {
637 Some(data_race::AllocExtra::new_allocation(data_race, alloc.size(), kind))
641 let buffer_alloc = if ecx.machine.weak_memory {
642 Some(weak_memory::AllocExtra::new_allocation())
646 let alloc: Allocation<Tag, Self::AllocExtra> = alloc.convert_tag_add_extra(
649 stacked_borrows: stacks.map(RefCell::new),
650 data_race: race_alloc,
651 weak_memory: buffer_alloc,
653 |ptr| ecx.global_base_pointer(ptr),
655 Ok(Cow::Owned(alloc))
658 fn tag_alloc_base_pointer(
659 ecx: &MiriEvalContext<'mir, 'tcx>,
660 ptr: Pointer<AllocId>,
662 if cfg!(debug_assertions) {
663 // The machine promises to never call us on thread-local or extern statics.
664 let alloc_id = ptr.provenance;
665 match ecx.tcx.get_global_alloc(alloc_id) {
666 Some(GlobalAlloc::Static(def_id)) if ecx.tcx.is_thread_local_static(def_id) => {
667 panic!("tag_alloc_base_pointer called on thread-local static")
669 Some(GlobalAlloc::Static(def_id)) if ecx.tcx.is_foreign_item(def_id) => {
670 panic!("tag_alloc_base_pointer called on extern static")
675 let absolute_addr = intptrcast::GlobalStateInner::rel_ptr_to_addr(ecx, ptr);
676 let sb_tag = if let Some(stacked_borrows) = &ecx.machine.stacked_borrows {
677 stacked_borrows.borrow_mut().base_tag(ptr.provenance)
682 Tag::Concrete { alloc_id: ptr.provenance, sb: sb_tag },
683 Size::from_bytes(absolute_addr),
688 fn ptr_from_addr_cast(
689 ecx: &MiriEvalContext<'mir, 'tcx>,
691 ) -> InterpResult<'tcx, Pointer<Option<Self::PointerTag>>> {
692 Ok(intptrcast::GlobalStateInner::ptr_from_addr_cast(ecx, addr))
696 fn ptr_from_addr_transmute(
697 ecx: &MiriEvalContext<'mir, 'tcx>,
699 ) -> Pointer<Option<Self::PointerTag>> {
700 intptrcast::GlobalStateInner::ptr_from_addr_transmute(ecx, addr)
704 ecx: &mut InterpCx<'mir, 'tcx, Self>,
705 ptr: Pointer<Self::PointerTag>,
706 ) -> InterpResult<'tcx> {
707 match ptr.provenance {
708 Tag::Concrete { alloc_id, sb } => {
709 intptrcast::GlobalStateInner::expose_ptr(ecx, alloc_id, sb);
712 // No need to do anything for wildcard pointers as
713 // their provenances have already been previously exposed.
719 /// Convert a pointer with provenance into an allocation-offset pair,
720 /// or a `None` with an absolute address if that conversion is not possible.
722 ecx: &MiriEvalContext<'mir, 'tcx>,
723 ptr: Pointer<Self::PointerTag>,
724 ) -> Option<(AllocId, Size, Self::TagExtra)> {
725 let rel = intptrcast::GlobalStateInner::abs_ptr_to_rel(ecx, ptr);
727 rel.map(|(alloc_id, size)| {
728 let sb = match ptr.provenance {
729 Tag::Concrete { sb, .. } => SbTagExtra::Concrete(sb),
730 Tag::Wildcard => SbTagExtra::Wildcard,
740 alloc_extra: &AllocExtra,
741 (alloc_id, tag): (AllocId, Self::TagExtra),
743 ) -> InterpResult<'tcx> {
744 if let Some(data_race) = &alloc_extra.data_race {
745 data_race.read(alloc_id, range, machine.data_race.as_ref().unwrap())?;
747 if let Some(stacked_borrows) = &alloc_extra.stacked_borrows {
748 stacked_borrows.borrow_mut().memory_read(
752 machine.stacked_borrows.as_ref().unwrap(),
753 machine.current_span(),
756 if let Some(weak_memory) = &alloc_extra.weak_memory {
757 weak_memory.memory_accessed(range, machine.data_race.as_ref().unwrap());
766 alloc_extra: &mut AllocExtra,
767 (alloc_id, tag): (AllocId, Self::TagExtra),
769 ) -> InterpResult<'tcx> {
770 if let Some(data_race) = &mut alloc_extra.data_race {
771 data_race.write(alloc_id, range, machine.data_race.as_mut().unwrap())?;
773 if let Some(stacked_borrows) = &mut alloc_extra.stacked_borrows {
774 stacked_borrows.get_mut().memory_written(
778 machine.stacked_borrows.as_ref().unwrap(),
779 machine.current_span(),
782 if let Some(weak_memory) = &alloc_extra.weak_memory {
783 weak_memory.memory_accessed(range, machine.data_race.as_ref().unwrap());
789 fn memory_deallocated(
792 alloc_extra: &mut AllocExtra,
793 (alloc_id, tag): (AllocId, Self::TagExtra),
795 ) -> InterpResult<'tcx> {
796 if machine.tracked_alloc_ids.contains(&alloc_id) {
797 register_diagnostic(NonHaltingDiagnostic::FreedAlloc(alloc_id));
799 if let Some(data_race) = &mut alloc_extra.data_race {
800 data_race.deallocate(alloc_id, range, machine.data_race.as_mut().unwrap())?;
802 if let Some(stacked_borrows) = &mut alloc_extra.stacked_borrows {
803 stacked_borrows.get_mut().memory_deallocated(
807 machine.stacked_borrows.as_ref().unwrap(),
816 ecx: &mut InterpCx<'mir, 'tcx, Self>,
817 kind: mir::RetagKind,
818 place: &PlaceTy<'tcx, Tag>,
819 ) -> InterpResult<'tcx> {
820 if ecx.machine.stacked_borrows.is_some() { ecx.retag(kind, place) } else { Ok(()) }
825 ecx: &mut InterpCx<'mir, 'tcx, Self>,
826 frame: Frame<'mir, 'tcx, Tag>,
827 ) -> InterpResult<'tcx, Frame<'mir, 'tcx, Tag, FrameData<'tcx>>> {
828 // Start recording our event before doing anything else
829 let timing = if let Some(profiler) = ecx.machine.profiler.as_ref() {
830 let fn_name = frame.instance.to_string();
831 let entry = ecx.machine.string_cache.entry(fn_name.clone());
832 let name = entry.or_insert_with(|| profiler.alloc_string(&*fn_name));
834 Some(profiler.start_recording_interval_event_detached(
836 measureme::EventId::from_label(*name),
837 ecx.get_active_thread().to_u32(),
843 let stacked_borrows = ecx.machine.stacked_borrows.as_ref();
844 let call_id = stacked_borrows.map_or(NonZeroU64::new(1).unwrap(), |stacked_borrows| {
845 stacked_borrows.borrow_mut().new_call()
848 let extra = FrameData { call_id, catch_unwind: None, timing };
849 Ok(frame.with_extra(extra))
853 ecx: &'a InterpCx<'mir, 'tcx, Self>,
854 ) -> &'a [Frame<'mir, 'tcx, Self::PointerTag, Self::FrameExtra>] {
855 ecx.active_thread_stack()
859 ecx: &'a mut InterpCx<'mir, 'tcx, Self>,
860 ) -> &'a mut Vec<Frame<'mir, 'tcx, Self::PointerTag, Self::FrameExtra>> {
861 ecx.active_thread_stack_mut()
864 fn before_terminator(ecx: &mut InterpCx<'mir, 'tcx, Self>) -> InterpResult<'tcx> {
865 ecx.maybe_preempt_active_thread();
870 fn after_stack_push(ecx: &mut InterpCx<'mir, 'tcx, Self>) -> InterpResult<'tcx> {
871 if ecx.machine.stacked_borrows.is_some() { ecx.retag_return_place() } else { Ok(()) }
876 ecx: &mut InterpCx<'mir, 'tcx, Self>,
877 mut frame: Frame<'mir, 'tcx, Tag, FrameData<'tcx>>,
879 ) -> InterpResult<'tcx, StackPopJump> {
880 let timing = frame.extra.timing.take();
881 let res = ecx.handle_stack_pop(frame.extra, unwinding);
882 if let Some(profiler) = ecx.machine.profiler.as_ref() {
883 profiler.finish_recording_interval_event(timing.unwrap());