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::time::Instant;
10 use rand::rngs::StdRng;
11 use rand::SeedableRng;
13 use rustc_ast::ast::Mutability;
14 use rustc_data_structures::fx::FxHashMap;
16 use rustc_data_structures::static_assert_size;
21 layout::{LayoutCx, LayoutError, LayoutOf, TyAndLayout},
22 Instance, TyCtxt, TypeAndMut,
25 use rustc_span::def_id::{CrateNum, DefId};
26 use rustc_span::Symbol;
27 use rustc_target::abi::Size;
28 use rustc_target::spec::abi::Abi;
31 concurrency::{data_race, weak_memory},
32 shims::unix::FileHandler,
36 // Some global facts about the emulated machine.
37 pub const PAGE_SIZE: u64 = 4 * 1024; // FIXME: adjust to target architecture
38 pub const STACK_ADDR: u64 = 32 * PAGE_SIZE; // not really about the "stack", but where we start assigning integer addresses to allocations
39 pub const STACK_SIZE: u64 = 16 * PAGE_SIZE; // whatever
40 pub const NUM_CPUS: u64 = 1;
42 /// Extra data stored with each stack frame
43 pub struct FrameData<'tcx> {
44 /// Extra data for Stacked Borrows.
45 pub stacked_borrows: Option<stacked_borrows::FrameExtra>,
47 /// If this is Some(), then this is a special "catch unwind" frame (the frame of `try_fn`
48 /// called by `try`). When this frame is popped during unwinding a panic,
49 /// we stop unwinding, use the `CatchUnwindData` to handle catching.
50 pub catch_unwind: Option<CatchUnwindData<'tcx>>,
52 /// If `measureme` profiling is enabled, holds timing information
53 /// for the start of this frame. When we finish executing this frame,
54 /// we use this to register a completed event with `measureme`.
55 pub timing: Option<measureme::DetachedTiming>,
58 impl<'tcx> std::fmt::Debug for FrameData<'tcx> {
59 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
60 // Omitting `timing`, it does not support `Debug`.
61 let FrameData { stacked_borrows, catch_unwind, timing: _ } = self;
62 f.debug_struct("FrameData")
63 .field("stacked_borrows", stacked_borrows)
64 .field("catch_unwind", catch_unwind)
69 /// Extra memory kinds
70 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
71 pub enum MiriMemoryKind {
72 /// `__rust_alloc` memory.
76 /// Windows `HeapAlloc` memory.
78 /// Memory for args, errno, and other parts of the machine-managed environment.
79 /// This memory may leak.
81 /// Memory allocated by the runtime (e.g. env vars). Separate from `Machine`
82 /// because we clean it up and leak-check it.
84 /// Globals copied from `tcx`.
85 /// This memory may leak.
87 /// Memory for extern statics.
88 /// This memory may leak.
90 /// Memory for thread-local statics.
91 /// This memory may leak.
95 impl From<MiriMemoryKind> for MemoryKind<MiriMemoryKind> {
97 fn from(kind: MiriMemoryKind) -> MemoryKind<MiriMemoryKind> {
98 MemoryKind::Machine(kind)
102 impl MayLeak for MiriMemoryKind {
104 fn may_leak(self) -> bool {
105 use self::MiriMemoryKind::*;
107 Rust | C | WinHeap | Runtime => false,
108 Machine | Global | ExternStatic | Tls => true,
113 impl fmt::Display for MiriMemoryKind {
114 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
115 use self::MiriMemoryKind::*;
117 Rust => write!(f, "Rust heap"),
118 C => write!(f, "C heap"),
119 WinHeap => write!(f, "Windows heap"),
120 Machine => write!(f, "machine-managed memory"),
121 Runtime => write!(f, "language runtime memory"),
122 Global => write!(f, "global (static or const)"),
123 ExternStatic => write!(f, "extern static"),
124 Tls => write!(f, "thread-local static"),
129 /// Pointer provenance (tag).
130 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
134 /// Stacked Borrows tag.
140 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
141 static_assert_size!(Pointer<Tag>, 24);
142 // FIXME: this would with in 24bytes but layout optimizations are not smart enough
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, "{:#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,
337 /// If `Some`, we will report the current stack every N basic blocks.
338 pub(crate) report_progress: Option<u32>,
339 /// The number of blocks that passed since the last progress report.
340 pub(crate) since_progress_report: u32,
343 impl<'mir, 'tcx> Evaluator<'mir, 'tcx> {
344 pub(crate) fn new(config: &MiriConfig, layout_cx: LayoutCx<'tcx, TyCtxt<'tcx>>) -> Self {
345 let local_crates = helpers::get_local_crates(layout_cx.tcx);
347 PrimitiveLayouts::new(layout_cx).expect("Couldn't get layouts of primitive types");
348 let profiler = config.measureme_out.as_ref().map(|out| {
349 measureme::Profiler::new(out).expect("Couldn't create `measureme` profiler")
351 let rng = StdRng::seed_from_u64(config.seed.unwrap_or(0));
352 let stacked_borrows = if config.stacked_borrows {
353 Some(RefCell::new(stacked_borrows::GlobalStateInner::new(
354 config.tracked_pointer_tags.clone(),
355 config.tracked_call_ids.clone(),
362 if config.data_race_detector { Some(data_race::GlobalState::new()) } else { None };
366 intptrcast: RefCell::new(intptrcast::GlobalStateInner::new(config)),
367 // `env_vars` depends on a full interpreter so we cannot properly initialize it yet.
368 env_vars: EnvVars::default(),
372 tls: TlsData::default(),
373 isolated_op: config.isolated_op,
374 validate: config.validate,
375 allow_uninit_numbers: config.allow_uninit_numbers,
376 allow_ptr_int_transmute: config.allow_ptr_int_transmute,
377 enforce_abi: config.check_abi,
378 file_handler: FileHandler::new(config.mute_stdout_stderr),
379 dir_handler: Default::default(),
380 time_anchor: Instant::now(),
382 threads: ThreadManager::default(),
383 static_roots: Vec::new(),
385 string_cache: Default::default(),
386 exported_symbols_cache: FxHashMap::default(),
387 panic_on_unsupported: config.panic_on_unsupported,
388 backtrace_style: config.backtrace_style,
390 extern_statics: FxHashMap::default(),
391 rng: RefCell::new(rng),
392 tracked_alloc_ids: config.tracked_alloc_ids.clone(),
393 check_alignment: config.check_alignment,
394 cmpxchg_weak_failure_rate: config.cmpxchg_weak_failure_rate,
395 mute_stdout_stderr: config.mute_stdout_stderr,
396 weak_memory: config.weak_memory_emulation,
397 preemption_rate: config.preemption_rate,
398 report_progress: config.report_progress,
399 since_progress_report: 0,
403 pub(crate) fn late_init(
404 this: &mut MiriEvalContext<'mir, 'tcx>,
406 ) -> InterpResult<'tcx> {
407 EnvVars::init(this, config)?;
408 Evaluator::init_extern_statics(this)?;
412 fn add_extern_static(
413 this: &mut MiriEvalContext<'mir, 'tcx>,
415 ptr: Pointer<Option<Tag>>,
417 // This got just allocated, so there definitely is a pointer here.
418 let ptr = ptr.into_pointer_or_addr().unwrap();
419 this.machine.extern_statics.try_insert(Symbol::intern(name), ptr).unwrap();
422 /// Sets up the "extern statics" for this machine.
423 fn init_extern_statics(this: &mut MiriEvalContext<'mir, 'tcx>) -> InterpResult<'tcx> {
424 match this.tcx.sess.target.os.as_ref() {
427 Self::add_extern_static(
430 this.machine.env_vars.environ.unwrap().ptr,
432 // A couple zero-initialized pointer-sized extern statics.
433 // Most of them are for weak symbols, which we all set to null (indicating that the
434 // symbol is not supported, and triggering fallback code which ends up calling a
435 // syscall that we do support).
436 for name in &["__cxa_thread_atexit_impl", "getrandom", "statx", "__clock_gettime64"]
438 let layout = this.machine.layouts.usize;
439 let place = this.allocate(layout, MiriMemoryKind::ExternStatic.into())?;
440 this.write_scalar(Scalar::from_machine_usize(0, this), &place.into())?;
441 Self::add_extern_static(this, name, place.ptr);
446 Self::add_extern_static(
449 this.machine.env_vars.environ.unwrap().ptr,
454 // This is some obscure hack that is part of the Windows TLS story. It's a `u8`.
455 let layout = this.machine.layouts.u8;
456 let place = this.allocate(layout, MiriMemoryKind::ExternStatic.into())?;
457 this.write_scalar(Scalar::from_u8(0), &place.into())?;
458 Self::add_extern_static(this, "_tls_used", place.ptr);
460 _ => {} // No "extern statics" supported on this target
465 pub(crate) fn communicate(&self) -> bool {
466 self.isolated_op == IsolatedOp::Allow
469 /// Check whether the stack frame that this `FrameInfo` refers to is part of a local crate.
470 pub(crate) fn is_local(&self, frame: &FrameInfo<'_>) -> bool {
471 let def_id = frame.instance.def_id();
472 def_id.is_local() || self.local_crates.contains(&def_id.krate)
476 /// A rustc InterpCx for Miri.
477 pub type MiriEvalContext<'mir, 'tcx> = InterpCx<'mir, 'tcx, Evaluator<'mir, 'tcx>>;
479 /// A little trait that's useful to be inherited by extension traits.
480 pub trait MiriEvalContextExt<'mir, 'tcx> {
481 fn eval_context_ref<'a>(&'a self) -> &'a MiriEvalContext<'mir, 'tcx>;
482 fn eval_context_mut<'a>(&'a mut self) -> &'a mut MiriEvalContext<'mir, 'tcx>;
484 impl<'mir, 'tcx> MiriEvalContextExt<'mir, 'tcx> for MiriEvalContext<'mir, 'tcx> {
486 fn eval_context_ref(&self) -> &MiriEvalContext<'mir, 'tcx> {
490 fn eval_context_mut(&mut self) -> &mut MiriEvalContext<'mir, 'tcx> {
495 /// Machine hook implementations.
496 impl<'mir, 'tcx> Machine<'mir, 'tcx> for Evaluator<'mir, 'tcx> {
497 type MemoryKind = MiriMemoryKind;
498 type ExtraFnVal = Dlsym;
500 type FrameExtra = FrameData<'tcx>;
501 type AllocExtra = AllocExtra;
503 type PointerTag = Tag;
504 type TagExtra = SbTagExtra;
507 MonoHashMap<AllocId, (MemoryKind<MiriMemoryKind>, Allocation<Tag, Self::AllocExtra>)>;
509 const GLOBAL_KIND: Option<MiriMemoryKind> = Some(MiriMemoryKind::Global);
511 const PANIC_ON_ALLOC_FAIL: bool = false;
514 fn enforce_alignment(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
515 ecx.machine.check_alignment != AlignmentCheck::None
519 fn force_int_for_alignment_check(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
520 ecx.machine.check_alignment == AlignmentCheck::Int
524 fn enforce_validity(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
529 fn enforce_number_init(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
530 !ecx.machine.allow_uninit_numbers
534 fn enforce_number_no_provenance(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
535 !ecx.machine.allow_ptr_int_transmute
539 fn enforce_abi(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
540 ecx.machine.enforce_abi
544 fn checked_binop_checks_overflow(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
545 ecx.tcx.sess.overflow_checks()
549 fn find_mir_or_eval_fn(
550 ecx: &mut MiriEvalContext<'mir, 'tcx>,
551 instance: ty::Instance<'tcx>,
553 args: &[OpTy<'tcx, Tag>],
554 dest: &PlaceTy<'tcx, Tag>,
555 ret: Option<mir::BasicBlock>,
556 unwind: StackPopUnwind,
557 ) -> InterpResult<'tcx, Option<(&'mir mir::Body<'tcx>, ty::Instance<'tcx>)>> {
558 ecx.find_mir_or_eval_fn(instance, abi, args, dest, ret, unwind)
563 ecx: &mut MiriEvalContext<'mir, '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_dlsym(fn_val, abi, args, dest, ret)
576 ecx: &mut MiriEvalContext<'mir, 'tcx>,
577 instance: ty::Instance<'tcx>,
578 args: &[OpTy<'tcx, Tag>],
579 dest: &PlaceTy<'tcx, Tag>,
580 ret: Option<mir::BasicBlock>,
581 unwind: StackPopUnwind,
582 ) -> InterpResult<'tcx> {
583 ecx.call_intrinsic(instance, args, dest, ret, unwind)
588 ecx: &mut MiriEvalContext<'mir, 'tcx>,
589 msg: &mir::AssertMessage<'tcx>,
590 unwind: Option<mir::BasicBlock>,
591 ) -> InterpResult<'tcx> {
592 ecx.assert_panic(msg, unwind)
596 fn abort(_ecx: &mut MiriEvalContext<'mir, 'tcx>, msg: String) -> InterpResult<'tcx, !> {
597 throw_machine_stop!(TerminationInfo::Abort(msg))
602 ecx: &MiriEvalContext<'mir, 'tcx>,
604 left: &ImmTy<'tcx, Tag>,
605 right: &ImmTy<'tcx, Tag>,
606 ) -> InterpResult<'tcx, (Scalar<Tag>, bool, ty::Ty<'tcx>)> {
607 ecx.binary_ptr_op(bin_op, left, right)
610 fn thread_local_static_base_pointer(
611 ecx: &mut MiriEvalContext<'mir, 'tcx>,
613 ) -> InterpResult<'tcx, Pointer<Tag>> {
614 ecx.get_or_create_thread_local_alloc(def_id)
617 fn extern_static_base_pointer(
618 ecx: &MiriEvalContext<'mir, 'tcx>,
620 ) -> InterpResult<'tcx, Pointer<Tag>> {
621 let link_name = ecx.item_link_name(def_id);
622 if let Some(&ptr) = ecx.machine.extern_statics.get(&link_name) {
626 "`extern` static `{}` from crate `{}` is not supported by Miri",
627 ecx.tcx.def_path_str(def_id),
628 ecx.tcx.crate_name(def_id.krate),
633 fn init_allocation_extra<'b>(
634 ecx: &MiriEvalContext<'mir, 'tcx>,
636 alloc: Cow<'b, Allocation>,
637 kind: Option<MemoryKind<Self::MemoryKind>>,
638 ) -> InterpResult<'tcx, Cow<'b, Allocation<Self::PointerTag, Self::AllocExtra>>> {
639 let kind = kind.expect("we set our STATIC_KIND so this cannot be None");
640 if ecx.machine.tracked_alloc_ids.contains(&id) {
641 register_diagnostic(NonHaltingDiagnostic::CreatedAlloc(
649 let alloc = alloc.into_owned();
650 let stacks = if let Some(stacked_borrows) = &ecx.machine.stacked_borrows {
651 Some(Stacks::new_allocation(
656 ecx.machine.current_span(),
661 let race_alloc = if let Some(data_race) = &ecx.machine.data_race {
662 Some(data_race::AllocExtra::new_allocation(
664 &ecx.machine.threads,
671 let buffer_alloc = if ecx.machine.weak_memory {
672 Some(weak_memory::AllocExtra::new_allocation())
676 let alloc: Allocation<Tag, Self::AllocExtra> = alloc.convert_tag_add_extra(
679 stacked_borrows: stacks.map(RefCell::new),
680 data_race: race_alloc,
681 weak_memory: buffer_alloc,
683 |ptr| ecx.global_base_pointer(ptr),
685 Ok(Cow::Owned(alloc))
688 fn tag_alloc_base_pointer(
689 ecx: &MiriEvalContext<'mir, 'tcx>,
690 ptr: Pointer<AllocId>,
692 if cfg!(debug_assertions) {
693 // The machine promises to never call us on thread-local or extern statics.
694 let alloc_id = ptr.provenance;
695 match ecx.tcx.get_global_alloc(alloc_id) {
696 Some(GlobalAlloc::Static(def_id)) if ecx.tcx.is_thread_local_static(def_id) => {
697 panic!("tag_alloc_base_pointer called on thread-local static")
699 Some(GlobalAlloc::Static(def_id)) if ecx.tcx.is_foreign_item(def_id) => {
700 panic!("tag_alloc_base_pointer called on extern static")
705 let absolute_addr = intptrcast::GlobalStateInner::rel_ptr_to_addr(ecx, ptr);
706 let sb_tag = if let Some(stacked_borrows) = &ecx.machine.stacked_borrows {
707 stacked_borrows.borrow_mut().base_ptr_tag(ptr.provenance)
709 // Value does not matter, SB is disabled
713 Tag::Concrete { alloc_id: ptr.provenance, sb: sb_tag },
714 Size::from_bytes(absolute_addr),
719 fn ptr_from_addr_cast(
720 ecx: &MiriEvalContext<'mir, 'tcx>,
722 ) -> InterpResult<'tcx, Pointer<Option<Self::PointerTag>>> {
723 intptrcast::GlobalStateInner::ptr_from_addr_cast(ecx, addr)
727 fn ptr_from_addr_transmute(
728 ecx: &MiriEvalContext<'mir, 'tcx>,
730 ) -> Pointer<Option<Self::PointerTag>> {
731 intptrcast::GlobalStateInner::ptr_from_addr_transmute(ecx, addr)
735 ecx: &mut InterpCx<'mir, 'tcx, Self>,
736 ptr: Pointer<Self::PointerTag>,
737 ) -> InterpResult<'tcx> {
738 match ptr.provenance {
739 Tag::Concrete { alloc_id, sb } => {
740 intptrcast::GlobalStateInner::expose_ptr(ecx, alloc_id, sb);
743 // No need to do anything for wildcard pointers as
744 // their provenances have already been previously exposed.
750 /// Convert a pointer with provenance into an allocation-offset pair,
751 /// or a `None` with an absolute address if that conversion is not possible.
753 ecx: &MiriEvalContext<'mir, 'tcx>,
754 ptr: Pointer<Self::PointerTag>,
755 ) -> Option<(AllocId, Size, Self::TagExtra)> {
756 let rel = intptrcast::GlobalStateInner::abs_ptr_to_rel(ecx, ptr);
758 rel.map(|(alloc_id, size)| {
759 let sb = match ptr.provenance {
760 Tag::Concrete { sb, .. } => SbTagExtra::Concrete(sb),
761 Tag::Wildcard => SbTagExtra::Wildcard,
771 alloc_extra: &AllocExtra,
772 (alloc_id, tag): (AllocId, Self::TagExtra),
774 ) -> InterpResult<'tcx> {
775 if let Some(data_race) = &alloc_extra.data_race {
779 machine.data_race.as_ref().unwrap(),
783 if let Some(stacked_borrows) = &alloc_extra.stacked_borrows {
784 stacked_borrows.borrow_mut().memory_read(
788 machine.stacked_borrows.as_ref().unwrap(),
789 machine.current_span(),
793 if let Some(weak_memory) = &alloc_extra.weak_memory {
794 weak_memory.memory_accessed(range, machine.data_race.as_ref().unwrap());
803 alloc_extra: &mut AllocExtra,
804 (alloc_id, tag): (AllocId, Self::TagExtra),
806 ) -> InterpResult<'tcx> {
807 if let Some(data_race) = &mut alloc_extra.data_race {
811 machine.data_race.as_mut().unwrap(),
815 if let Some(stacked_borrows) = &mut alloc_extra.stacked_borrows {
816 stacked_borrows.get_mut().memory_written(
820 machine.stacked_borrows.as_ref().unwrap(),
821 machine.current_span(),
825 if let Some(weak_memory) = &alloc_extra.weak_memory {
826 weak_memory.memory_accessed(range, machine.data_race.as_ref().unwrap());
832 fn memory_deallocated(
835 alloc_extra: &mut AllocExtra,
836 (alloc_id, tag): (AllocId, Self::TagExtra),
838 ) -> InterpResult<'tcx> {
839 if machine.tracked_alloc_ids.contains(&alloc_id) {
840 register_diagnostic(NonHaltingDiagnostic::FreedAlloc(alloc_id));
842 if let Some(data_race) = &mut alloc_extra.data_race {
843 data_race.deallocate(
846 machine.data_race.as_mut().unwrap(),
850 if let Some(stacked_borrows) = &mut alloc_extra.stacked_borrows {
851 stacked_borrows.get_mut().memory_deallocated(
855 machine.stacked_borrows.as_ref().unwrap(),
865 ecx: &mut InterpCx<'mir, 'tcx, Self>,
866 kind: mir::RetagKind,
867 place: &PlaceTy<'tcx, Tag>,
868 ) -> InterpResult<'tcx> {
869 if ecx.machine.stacked_borrows.is_some() { ecx.retag(kind, place) } else { Ok(()) }
874 ecx: &mut InterpCx<'mir, 'tcx, Self>,
875 frame: Frame<'mir, 'tcx, Tag>,
876 ) -> InterpResult<'tcx, Frame<'mir, 'tcx, Tag, FrameData<'tcx>>> {
877 // Start recording our event before doing anything else
878 let timing = if let Some(profiler) = ecx.machine.profiler.as_ref() {
879 let fn_name = frame.instance.to_string();
880 let entry = ecx.machine.string_cache.entry(fn_name.clone());
881 let name = entry.or_insert_with(|| profiler.alloc_string(&*fn_name));
883 Some(profiler.start_recording_interval_event_detached(
885 measureme::EventId::from_label(*name),
886 ecx.get_active_thread().to_u32(),
892 let stacked_borrows = ecx.machine.stacked_borrows.as_ref();
894 let extra = FrameData {
895 stacked_borrows: stacked_borrows.map(|sb| sb.borrow_mut().new_frame()),
899 Ok(frame.with_extra(extra))
903 ecx: &'a InterpCx<'mir, 'tcx, Self>,
904 ) -> &'a [Frame<'mir, 'tcx, Self::PointerTag, Self::FrameExtra>] {
905 ecx.active_thread_stack()
909 ecx: &'a mut InterpCx<'mir, 'tcx, Self>,
910 ) -> &'a mut Vec<Frame<'mir, 'tcx, Self::PointerTag, Self::FrameExtra>> {
911 ecx.active_thread_stack_mut()
914 fn before_terminator(ecx: &mut InterpCx<'mir, 'tcx, Self>) -> InterpResult<'tcx> {
915 // Possibly report our progress.
916 if let Some(report_progress) = ecx.machine.report_progress {
917 if ecx.machine.since_progress_report >= report_progress {
918 register_diagnostic(NonHaltingDiagnostic::ProgressReport);
919 ecx.machine.since_progress_report = 0;
921 // Cannot overflow, since it is strictly less than `report_progress`.
922 ecx.machine.since_progress_report += 1;
924 // These are our preemption points.
925 ecx.maybe_preempt_active_thread();
930 fn after_stack_push(ecx: &mut InterpCx<'mir, 'tcx, Self>) -> InterpResult<'tcx> {
931 if ecx.machine.stacked_borrows.is_some() { ecx.retag_return_place() } else { Ok(()) }
936 ecx: &mut InterpCx<'mir, 'tcx, Self>,
937 mut frame: Frame<'mir, 'tcx, Tag, FrameData<'tcx>>,
939 ) -> InterpResult<'tcx, StackPopJump> {
940 let timing = frame.extra.timing.take();
941 if let Some(stacked_borrows) = &ecx.machine.stacked_borrows {
942 stacked_borrows.borrow_mut().end_call(&frame.extra);
944 let res = ecx.handle_stack_pop_unwind(frame.extra, unwinding);
945 if let Some(profiler) = ecx.machine.profiler.as_ref() {
946 profiler.finish_recording_interval_event(timing.unwrap());