pub struct CompileTimeInterpreter<'tcx> {
    pub(super) num_evaluated_steps: usize,
    pub(super) stack: Vec<Frame<'tcx>>,
    pub(super) can_access_mut_global: CanAccessMutGlobal,
    pub(super) check_alignment: CheckAlignment,
    pub(crate) static_root_ids: Option<(AllocId, LocalDefId)>,
}
Expand description

Extra machine state for CTFE, and the Machine instance

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§num_evaluated_steps: usize

The number of terminators that have been evaluated.

This is used to produce lints informing the user that the compiler is not stuck. Set to usize::MAX to never report anything.

§stack: Vec<Frame<'tcx>>

The virtual call stack.

§can_access_mut_global: CanAccessMutGlobal

Pattern matching on consts with references would be unsound if those references could point to anything mutable. Therefore, when evaluating consts and when constructing valtrees, we ensure that only immutable global memory can be accessed.

§check_alignment: CheckAlignment

Whether to check alignment during evaluation.

§static_root_ids: Option<(AllocId, LocalDefId)>

If Some, we are evaluating the initializer of the static with the given LocalDefId, storing the result in the given AllocId. Used to prevent reads from a static’s base allocation, as that may allow for self-initialization loops.

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impl<'tcx> CompileTimeInterpreter<'tcx>

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pub(crate) fn new( can_access_mut_global: CanAccessMutGlobal, check_alignment: CheckAlignment, ) -> Self

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impl HasStaticRootDefId for CompileTimeInterpreter<'_>

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fn static_def_id(&self) -> Option<LocalDefId>

Returns the DefId of the static item that is currently being evaluated. Used for interning to be able to handle nested allocations.
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impl<'tcx> Machine<'tcx> for CompileTimeInterpreter<'tcx>

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type Provenance = CtfeProvenance

Pointers are “tagged” with provenance information; typically the AllocId they belong to.
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type ProvenanceExtra = bool

When getting the AllocId of a pointer, some extra data is also obtained from the provenance that is passed to memory access hooks so they can do things with it.
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type ExtraFnVal = !

Machines can define extra (non-instance) things that represent values of function pointers. For example, Miri uses this to return a function pointer from dlsym that can later be called to execute the right thing.
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type MemoryMap = IndexMap<AllocId, (MemoryKind<MemoryKind>, Allocation), BuildHasherDefault<FxHasher>>

Memory’s allocation map
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const GLOBAL_KIND: Option<Self::MemoryKind> = None

The memory kind to use for copied global memory (held in tcx) – or None if such memory should not be mutated and thus any such attempt will cause a ModifiedStatic error to be raised. Statics are copied under two circumstances: When they are mutated, and when adjust_allocation (see below) returns an owned allocation that is added to the memory so that the work is not done twice.
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type AllocExtra = ()

Extra data stored in every allocation.
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type FrameExtra = ()

Extra data stored in every call frame.
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type Bytes = Box<[u8]>

Type for the bytes of the allocation.
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fn ignore_optional_overflow_checks(_ecx: &InterpCx<'tcx, Self>) -> bool

Whether Assert(OverflowNeg) and Assert(Overflow) MIR terminators should actually check for overflow.
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fn unwind_terminate( _ecx: &mut InterpCx<'tcx, Self>, _reason: UnwindTerminateReason, ) -> InterpResult<'tcx>

Called when unwinding reached a state where execution should be terminated.
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fn call_extra_fn( _ecx: &mut InterpCx<'tcx, Self>, fn_val: !, _abi: CallAbi, _args: &[FnArg<'tcx>], _destination: &MPlaceTy<'tcx, Self::Provenance>, _target: Option<BasicBlock>, _unwind: UnwindAction, ) -> InterpResult<'tcx>

Execute fn_val. It is the hook’s responsibility to advance the instruction pointer as appropriate.
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fn adjust_global_allocation<'b>( _ecx: &InterpCx<'tcx, Self>, _id: AllocId, alloc: &'b Allocation, ) -> InterpResult<'tcx, Cow<'b, Allocation<Self::Provenance>>>

Called to adjust global allocations to the Provenance and AllocExtra of this machine. Read more
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fn init_alloc_extra( _ecx: &InterpCx<'tcx, Self>, _id: AllocId, _kind: MemoryKind<Self::MemoryKind>, _size: Size, _align: Align, ) -> InterpResult<'tcx, Self::AllocExtra>

Initialize the extra state of an allocation. Read more
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fn extern_static_pointer( ecx: &InterpCx<'tcx, Self>, def_id: DefId, ) -> InterpResult<'tcx, Pointer>

Return the AllocId for the given extern static.
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fn adjust_alloc_root_pointer( _ecx: &InterpCx<'tcx, Self>, ptr: Pointer<CtfeProvenance>, _kind: Option<MemoryKind<Self::MemoryKind>>, ) -> InterpResult<'tcx, Pointer<CtfeProvenance>>

Return a “root” pointer for the given allocation: the one that is used for direct accesses to this static/const/fn allocation, or the one returned from the heap allocator. Read more
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fn ptr_from_addr_cast( _ecx: &InterpCx<'tcx, Self>, addr: u64, ) -> InterpResult<'tcx, Pointer<Option<CtfeProvenance>>>

“Int-to-pointer cast”
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fn ptr_get_alloc( _ecx: &InterpCx<'tcx, Self>, ptr: Pointer<CtfeProvenance>, ) -> Option<(AllocId, Size, Self::ProvenanceExtra)>

Convert a pointer with provenance into an allocation-offset pair and extra provenance info. Read more
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type MemoryKind = MemoryKind

Additional memory kinds a machine wishes to distinguish from the builtin ones
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const PANIC_ON_ALLOC_FAIL: bool = false

Should the machine panic on allocation failures?
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fn enforce_alignment(ecx: &InterpCx<'tcx, Self>) -> bool

Whether memory accesses should be alignment-checked.
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fn enforce_validity( ecx: &InterpCx<'tcx, Self>, layout: TyAndLayout<'tcx>, ) -> bool

Whether to enforce the validity invariant for a specific layout.
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fn load_mir( ecx: &InterpCx<'tcx, Self>, instance: InstanceDef<'tcx>, ) -> InterpResult<'tcx, &'tcx Body<'tcx>>

Entry point for obtaining the MIR of anything that should get evaluated. So not just functions and shims, but also const/static initializers, anonymous constants, …
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fn find_mir_or_eval_fn( ecx: &mut InterpCx<'tcx, Self>, orig_instance: Instance<'tcx>, _abi: CallAbi, args: &[FnArg<'tcx>], dest: &MPlaceTy<'tcx>, ret: Option<BasicBlock>, _unwind: UnwindAction, ) -> InterpResult<'tcx, Option<(&'tcx Body<'tcx>, Instance<'tcx>)>>

Entry point to all function calls. Read more
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fn panic_nounwind( ecx: &mut InterpCx<'tcx, Self>, msg: &str, ) -> InterpResult<'tcx>

Called to trigger a non-unwinding panic.
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fn call_intrinsic( ecx: &mut InterpCx<'tcx, Self>, instance: Instance<'tcx>, args: &[OpTy<'tcx>], dest: &MPlaceTy<'tcx, Self::Provenance>, target: Option<BasicBlock>, _unwind: UnwindAction, ) -> InterpResult<'tcx, Option<Instance<'tcx>>>

Directly process an intrinsic without pushing a stack frame. It is the hook’s responsibility to advance the instruction pointer as appropriate. Read more
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fn assert_panic( ecx: &mut InterpCx<'tcx, Self>, msg: &AssertMessage<'tcx>, _unwind: UnwindAction, ) -> InterpResult<'tcx>

Called to evaluate Assert MIR terminators that trigger a panic.
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fn binary_ptr_op( _ecx: &InterpCx<'tcx, Self>, _bin_op: BinOp, _left: &ImmTy<'tcx>, _right: &ImmTy<'tcx>, ) -> InterpResult<'tcx, ImmTy<'tcx>>

Called for all binary operations where the LHS has pointer type. Read more
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fn increment_const_eval_counter( ecx: &mut InterpCx<'tcx, Self>, ) -> InterpResult<'tcx>

Called when the interpreter encounters a StatementKind::ConstEvalCounter instruction. You can use this to detect long or endlessly running programs.
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fn expose_ptr( _ecx: &mut InterpCx<'tcx, Self>, _ptr: Pointer, ) -> InterpResult<'tcx>

Marks a pointer as exposed, allowing it’s provenance to be recovered. “Pointer-to-int cast”
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fn init_frame( ecx: &mut InterpCx<'tcx, Self>, frame: Frame<'tcx>, ) -> InterpResult<'tcx, Frame<'tcx>>

Called immediately before a new stack frame gets pushed.
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fn stack<'a>( ecx: &'a InterpCx<'tcx, Self>, ) -> &'a [Frame<'tcx, Self::Provenance, Self::FrameExtra>]

Borrow the current thread’s stack.
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fn stack_mut<'a>( ecx: &'a mut InterpCx<'tcx, Self>, ) -> &'a mut Vec<Frame<'tcx, Self::Provenance, Self::FrameExtra>>

Mutably borrow the current thread’s stack.
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fn before_access_global( _tcx: TyCtxtAt<'tcx>, machine: &Self, alloc_id: AllocId, alloc: ConstAllocation<'tcx>, _static_def_id: Option<DefId>, is_write: bool, ) -> InterpResult<'tcx>

Called before a global allocation is accessed. def_id is Some if this is the “lazy” allocation of a static.
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fn retag_ptr_value( ecx: &mut InterpCx<'tcx, Self>, _kind: RetagKind, val: &ImmTy<'tcx, CtfeProvenance>, ) -> InterpResult<'tcx, ImmTy<'tcx, CtfeProvenance>>

Executes a retagging operation for a single pointer. Returns the possibly adjusted pointer.
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fn before_memory_write( tcx: TyCtxtAt<'tcx>, machine: &mut Self, _alloc_extra: &mut Self::AllocExtra, (_alloc_id, immutable): (AllocId, bool), range: AllocRange, ) -> InterpResult<'tcx>

Hook for performing extra checks on a memory write access. This is not invoked for ZST accesses, as no write actually happens.
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fn before_alloc_read( ecx: &InterpCx<'tcx, Self>, alloc_id: AllocId, ) -> InterpResult<'tcx>

Hook for performing extra checks on any memory read access, that involves an allocation, even ZST reads. Read more
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const ALL_CONSTS_ARE_PRECHECKED: bool = true

Determines whether eval_mir_constant can never fail because all required consts have already been checked before.
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fn alignment_check( _ecx: &InterpCx<'tcx, Self>, _alloc_id: AllocId, _alloc_align: Align, _alloc_kind: AllocKind, _offset: Size, _align: Align, ) -> Option<Misalignment>

Gives the machine a chance to detect more misalignment than the built-in checks would catch.
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fn enforce_abi(_ecx: &InterpCx<'tcx, Self>) -> bool

Whether function calls should be ABI-checked.
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fn generate_nan<F1: Float + FloatConvert<F2>, F2: Float>( _ecx: &InterpCx<'tcx, Self>, _inputs: &[F1], ) -> F2

Generate the NaN returned by a float operation, given the list of inputs. (This is all inputs, not just NaN inputs!)
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fn before_terminator(_ecx: &mut InterpCx<'tcx, Self>) -> InterpResult<'tcx>

Called before a basic block terminator is executed.
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fn thread_local_static_pointer( _ecx: &mut InterpCx<'tcx, Self>, def_id: DefId, ) -> InterpResult<'tcx, Pointer<Self::Provenance>>

Return the AllocId for the given thread-local static in the current thread.
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fn eval_inline_asm( _ecx: &mut InterpCx<'tcx, Self>, _template: &'tcx [InlineAsmTemplatePiece], _operands: &[InlineAsmOperand<'tcx>], _options: InlineAsmOptions, _targets: &[BasicBlock], ) -> InterpResult<'tcx>

Evaluate the inline assembly. Read more
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fn before_memory_read( _tcx: TyCtxtAt<'tcx>, _machine: &Self, _alloc_extra: &Self::AllocExtra, _prov: (AllocId, Self::ProvenanceExtra), _range: AllocRange, ) -> InterpResult<'tcx>

Hook for performing extra checks on a memory read access. Read more
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fn before_memory_deallocation( _tcx: TyCtxtAt<'tcx>, _machine: &mut Self, _alloc_extra: &mut Self::AllocExtra, _prov: (AllocId, Self::ProvenanceExtra), _size: Size, _align: Align, _kind: MemoryKind<Self::MemoryKind>, ) -> InterpResult<'tcx>

Hook for performing extra operations on a memory deallocation.
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fn retag_place_contents( _ecx: &mut InterpCx<'tcx, Self>, _kind: RetagKind, _place: &PlaceTy<'tcx, Self::Provenance>, ) -> InterpResult<'tcx>

Executes a retagging operation on a compound value. Replaces all pointers stored in the given place.
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fn protect_in_place_function_argument( ecx: &mut InterpCx<'tcx, Self>, mplace: &MPlaceTy<'tcx, Self::Provenance>, ) -> InterpResult<'tcx>

Called on places used for in-place function argument and return value handling. Read more
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fn after_stack_push(_ecx: &mut InterpCx<'tcx, Self>) -> InterpResult<'tcx>

Called immediately after a stack frame got pushed and its locals got initialized.
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fn before_stack_pop( _ecx: &InterpCx<'tcx, Self>, _frame: &Frame<'tcx, Self::Provenance, Self::FrameExtra>, ) -> InterpResult<'tcx>

Called just before the return value is copied to the caller-provided return place.
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fn after_stack_pop( _ecx: &mut InterpCx<'tcx, Self>, _frame: Frame<'tcx, Self::Provenance, Self::FrameExtra>, unwinding: bool, ) -> InterpResult<'tcx, StackPopJump>

Called immediately after a stack frame got popped, but before jumping back to the caller. The locals have already been destroyed!
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fn after_local_allocated( _ecx: &mut InterpCx<'tcx, Self>, _local: Local, _mplace: &MPlaceTy<'tcx, Self::Provenance>, ) -> InterpResult<'tcx>

Called immediately after actual memory was allocated for a local but before the local’s stack frame is updated to point to that memory.
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fn eval_mir_constant<F>( ecx: &InterpCx<'tcx, Self>, val: Const<'tcx>, span: Span, layout: Option<TyAndLayout<'tcx>>, eval: F, ) -> InterpResult<'tcx, OpTy<'tcx, Self::Provenance>>
where F: Fn(&InterpCx<'tcx, Self>, Const<'tcx>, Span, Option<TyAndLayout<'tcx>>) -> InterpResult<'tcx, OpTy<'tcx, Self::Provenance>>,

Evaluate the given constant. The eval function will do all the required evaluation, but this hook has the chance to do some pre/postprocessing.

Auto Trait Implementations§

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impl<'tcx> !DynSend for CompileTimeInterpreter<'tcx>

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impl<'tcx> !DynSync for CompileTimeInterpreter<'tcx>

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impl<'tcx> Freeze for CompileTimeInterpreter<'tcx>

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impl<'tcx> !RefUnwindSafe for CompileTimeInterpreter<'tcx>

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impl<'tcx> !Send for CompileTimeInterpreter<'tcx>

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impl<'tcx> !Sync for CompileTimeInterpreter<'tcx>

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impl<'tcx> Unpin for CompileTimeInterpreter<'tcx>

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impl<'tcx> !UnwindSafe for CompileTimeInterpreter<'tcx>

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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impl<T> Filterable for T

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fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<P> IntoQueryParam<P> for P

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impl<T> MaybeResult<T> for T

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type Error = !

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fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

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fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<I, T, U> Upcast<I, U> for T
where U: UpcastFrom<I, T>,

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fn upcast(self, interner: I) -> U

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impl<I, T> UpcastFrom<I, T> for T

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fn upcast_from(from: T, _tcx: I) -> T

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impl<V, T> VZip<V> for T
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fn vzip(self) -> V

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impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed, ) -> T

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

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impl<T> ErasedDestructor for T
where T: 'static,

Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 56 bytes