Struct rustc_const_eval::interpret::InterpCx

pub struct InterpCx<'mir, 'tcx, M: Machine<'mir, 'tcx>> {
    pub machine: M,
    pub tcx: TyCtxtAt<'tcx>,
    pub(crate) param_env: ParamEnv<'tcx>,
    pub memory: Memory<'mir, 'tcx, M>,
    pub recursion_limit: Limit,
}

Fields

machine: M

Stores the Machine instance.

Note: the stack is provided by the machine.

tcx: TyCtxtAt<'tcx>

The results of the type checker, from rustc. The span in this is the “root” of the evaluation, i.e., the const we are evaluating (if this is CTFE).

param_env: ParamEnv<'tcx>

Bounds in scope for polymorphic evaluations.

memory: Memory<'mir, 'tcx, M>

The virtual memory system.

recursion_limit: Limit

The recursion limit (cached from tcx.recursion_limit(()))

Implementations

impl<'mir, 'tcx: 'mir> InterpCx<'mir, 'tcx, CompileTimeInterpreter<'mir, 'tcx>>

fn hook_special_const_fn( &mut self, instance: Instance<'tcx>, args: &[FnArg<'tcx>], dest: &PlaceTy<'tcx>, ret: Option<BasicBlock> ) -> InterpResult<'tcx, Option<Instance<'tcx>>>

“Intercept” a function call, because we have something special to do for it. All #[rustc_do_not_const_check] functions should be hooked here. If this returns Some function, which may be instance or a different function with compatible arguments, then evaluation should continue with that function. If this returns None, the function call has been handled and the function has returned.

fn align_offset( &mut self, instance: Instance<'tcx>, args: &[OpTy<'tcx>], dest: &PlaceTy<'tcx>, ret: Option<BasicBlock> ) -> InterpResult<'tcx, ControlFlow<()>>

align_offset(ptr, target_align) needs special handling in const eval, because the pointer may not have an address.

If ptr does have a known address, then we return Continue(()) and the function call should proceed as normal.

If ptr doesn’t have an address, but its underlying allocation’s alignment is at most target_align, then we call the function again with an dummy address relative to the allocation.

If ptr doesn’t have an address and target_align is stricter than the underlying allocation’s alignment, then we return usize::MAX immediately.

fn guaranteed_cmp(&mut self, a: Scalar, b: Scalar) -> InterpResult<'tcx, u8>

See documentation on the ptr_guaranteed_cmp intrinsic.

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M>

pub fn cast( &mut self, src: &OpTy<'tcx, M::Provenance>, cast_kind: CastKind, cast_ty: Ty<'tcx>, dest: &PlaceTy<'tcx, M::Provenance> ) -> InterpResult<'tcx>

pub fn int_to_int_or_float( &self, src: &ImmTy<'tcx, M::Provenance>, cast_to: TyAndLayout<'tcx> ) -> InterpResult<'tcx, ImmTy<'tcx, M::Provenance>>

Handles ‘IntToInt’ and ‘IntToFloat’ casts.

pub fn float_to_float_or_int( &self, src: &ImmTy<'tcx, M::Provenance>, cast_to: TyAndLayout<'tcx> ) -> InterpResult<'tcx, ImmTy<'tcx, M::Provenance>>

Handles ‘FloatToFloat’ and ‘FloatToInt’ casts.

pub fn ptr_to_ptr( &self, src: &ImmTy<'tcx, M::Provenance>, cast_to: TyAndLayout<'tcx> ) -> InterpResult<'tcx, ImmTy<'tcx, M::Provenance>>

Handles ‘FnPtrToPtr’ and ‘PtrToPtr’ casts.

pub fn pointer_expose_address_cast( &mut self, src: &ImmTy<'tcx, M::Provenance>, cast_to: TyAndLayout<'tcx> ) -> InterpResult<'tcx, ImmTy<'tcx, M::Provenance>>

pub fn pointer_from_exposed_address_cast( &self, src: &ImmTy<'tcx, M::Provenance>, cast_to: TyAndLayout<'tcx> ) -> InterpResult<'tcx, ImmTy<'tcx, M::Provenance>>

fn cast_from_int_like( &self, scalar: Scalar<M::Provenance>, src_layout: TyAndLayout<'tcx>, cast_ty: Ty<'tcx> ) -> InterpResult<'tcx, Scalar<M::Provenance>>

Low-level cast helper function. This works directly on scalars and can take ‘int-like’ input type (basically everything with a scalar layout) to int/float/char types.

fn cast_from_float<F>(&self, f: F, dest_ty: Ty<'tcx>) -> Scalar<M::Provenance>where F: Float + Into<Scalar<M::Provenance>> + FloatConvert<Single> + FloatConvert<Double>,

Low-level cast helper function. Converts an apfloat f into int or float types.

fn unsize_into_ptr( &mut self, src: &OpTy<'tcx, M::Provenance>, dest: &PlaceTy<'tcx, M::Provenance>, source_ty: Ty<'tcx>, cast_ty: Ty<'tcx> ) -> InterpResult<'tcx>

src is a pointer to a source_ty, and in dest we should store a pointer to th same data at type cast_ty.

fn unsize_into( &mut self, src: &OpTy<'tcx, M::Provenance>, cast_ty: TyAndLayout<'tcx>, dest: &PlaceTy<'tcx, M::Provenance> ) -> InterpResult<'tcx>

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M>

pub fn write_discriminant( &mut self, variant_index: VariantIdx, dest: &impl Writeable<'tcx, M::Provenance> ) -> InterpResult<'tcx>

Writes the discriminant of the given variant.

pub fn read_discriminant( &self, op: &impl Readable<'tcx, M::Provenance> ) -> InterpResult<'tcx, VariantIdx>

Read discriminant, return the runtime value as well as the variant index. Can also legally be called on non-enums (e.g. through the discriminant_value intrinsic)!

pub fn discriminant_for_variant( &self, layout: TyAndLayout<'tcx>, variant: VariantIdx ) -> InterpResult<'tcx, ImmTy<'tcx, M::Provenance>>

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M>

pub fn new( tcx: TyCtxt<'tcx>, root_span: Span, param_env: ParamEnv<'tcx>, machine: M ) -> Self

pub fn cur_span(&self) -> Span

pub fn best_lint_scope(&self) -> HirId

Find the first stack frame that is within the current crate, if any, otherwise return the crate’s HirId

pub fn format_error(&self, e: InterpErrorInfo<'tcx>) -> String

Turn the given error into a human-readable string. Expects the string to be printed, so if RUSTC_CTFE_BACKTRACE is set this will show a backtrace of the rustc internals that triggered the error.

This is NOT the preferred way to render an error; use report from const_eval instead. However, this is useful when error messages appear in ICEs.

pub(crate) fn stack(&self) -> &[Frame<'mir, 'tcx, M::Provenance, M::FrameExtra>]

pub(crate) fn stack_mut( &mut self ) -> &mut Vec<Frame<'mir, 'tcx, M::Provenance, M::FrameExtra>>

pub fn frame_idx(&self) -> usize

pub fn frame(&self) -> &Frame<'mir, 'tcx, M::Provenance, M::FrameExtra>

pub fn frame_mut( &mut self ) -> &mut Frame<'mir, 'tcx, M::Provenance, M::FrameExtra>

pub fn body(&self) -> &'mir Body<'tcx>

pub fn sign_extend(&self, value: u128, ty: TyAndLayout<'_>) -> u128

pub fn truncate(&self, value: u128, ty: TyAndLayout<'_>) -> u128

pub fn type_is_freeze(&self, ty: Ty<'tcx>) -> bool

pub fn load_mir( &self, instance: InstanceDef<'tcx>, promoted: Option<Promoted> ) -> InterpResult<'tcx, &'tcx Body<'tcx>>

pub(super) fn subst_from_current_frame_and_normalize_erasing_regions<T: TypeFoldable<TyCtxt<'tcx>>>( &self, value: T ) -> Result<T, ErrorHandled>

Call this on things you got out of the MIR (so it is as generic as the current stack frame), to bring it into the proper environment for this interpreter.

pub(super) fn subst_from_frame_and_normalize_erasing_regions<T: TypeFoldable<TyCtxt<'tcx>>>( &self, frame: &Frame<'mir, 'tcx, M::Provenance, M::FrameExtra>, value: T ) -> Result<T, ErrorHandled>

Call this on things you got out of the MIR (so it is as generic as the provided stack frame), to bring it into the proper environment for this interpreter.

pub(super) fn resolve( &self, def: DefId, args: GenericArgsRef<'tcx> ) -> InterpResult<'tcx, Instance<'tcx>>

The args are assumed to already be in our interpreter “universe” (param_env).

pub fn layout_of_local( &self, frame: &Frame<'mir, 'tcx, M::Provenance, M::FrameExtra>, local: Local, layout: Option<TyAndLayout<'tcx>> ) -> InterpResult<'tcx, TyAndLayout<'tcx>>

pub(super) fn size_and_align_of( &self, metadata: &MemPlaceMeta<M::Provenance>, layout: &TyAndLayout<'tcx> ) -> InterpResult<'tcx, Option<(Size, Align)>>

Returns the actual dynamic size and alignment of the place at the given type. Only the “meta” (metadata) part of the place matters. This can fail to provide an answer for extern types.

pub fn size_and_align_of_mplace( &self, mplace: &MPlaceTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, Option<(Size, Align)>>

pub fn push_stack_frame( &mut self, instance: Instance<'tcx>, body: &'mir Body<'tcx>, return_place: &PlaceTy<'tcx, M::Provenance>, return_to_block: StackPopCleanup ) -> InterpResult<'tcx>

pub fn go_to_block(&mut self, target: BasicBlock)

Jump to the given block.

pub fn return_to_block( &mut self, target: Option<BasicBlock> ) -> InterpResult<'tcx>

Return to the given target basic block. Do not use for unwinding! Use unwind_to_block instead.

If target is None, that indicates the function cannot return, so we raise UB.

pub fn unwind_to_block(&mut self, target: UnwindAction) -> InterpResult<'tcx>

Unwind to the given target basic block. Do not use for returning! Use return_to_block instead.

If target is UnwindAction::Continue, that indicates the function does not need cleanup during unwinding, and we will just keep propagating that upwards.

If target is UnwindAction::Unreachable, that indicates the function does not allow unwinding, and doing so is UB.

pub(super) fn pop_stack_frame(&mut self, unwinding: bool) -> InterpResult<'tcx>

Pops the current frame from the stack, deallocating the memory for allocated locals.

If unwinding is false, then we are performing a normal return from a function. In this case, we jump back into the frame of the caller, and continue execution as normal.

If unwinding is true, then we are in the middle of a panic, and need to unwind this frame. In this case, we jump to the cleanup block for the function, which is responsible for running Drop impls for any locals that have been initialized at this point. The cleanup block ends with a special Resume terminator, which will cause us to continue unwinding.

pub fn storage_live_for_always_live_locals(&mut self) -> InterpResult<'tcx>

In the current stack frame, mark all locals as live that are not arguments and don’t have Storage* annotations (this includes the return place).

pub fn storage_live_dyn( &mut self, local: Local, meta: MemPlaceMeta<M::Provenance> ) -> InterpResult<'tcx>

pub fn storage_live(&mut self, local: Local) -> InterpResult<'tcx>

Mark a storage as live, killing the previous content.

pub fn storage_dead(&mut self, local: Local) -> InterpResult<'tcx>

fn deallocate_local( &mut self, local: LocalValue<M::Provenance> ) -> InterpResult<'tcx>

pub fn ctfe_query<T>( &self, span: Option<Span>, query: impl FnOnce(TyCtxtAt<'tcx>) -> Result<T, ErrorHandled> ) -> Result<T, ErrorHandled>

Call a query that can return ErrorHandled. If span is Some, point to that span when an error occurs.

pub fn eval_global( &self, instance: Instance<'tcx> ) -> InterpResult<'tcx, MPlaceTy<'tcx, M::Provenance>>

pub fn eval_mir_constant( &self, val: &Const<'tcx>, span: Option<Span>, layout: Option<TyAndLayout<'tcx>> ) -> InterpResult<'tcx, OpTy<'tcx, M::Provenance>>

pub fn dump_place( &self, place: &PlaceTy<'tcx, M::Provenance> ) -> PlacePrinter<'_, 'mir, 'tcx, M>

pub fn generate_stacktrace_from_stack( stack: &[Frame<'mir, 'tcx, M::Provenance, M::FrameExtra>] ) -> Vec<FrameInfo<'tcx>>

pub fn generate_stacktrace(&self) -> Vec<FrameInfo<'tcx>>

impl<'mir, 'tcx: 'mir, M: CompileTimeMachine<'mir, 'tcx, !>> InterpCx<'mir, 'tcx, M>

pub fn intern_with_temp_alloc( &mut self, layout: TyAndLayout<'tcx>, f: impl FnOnce(&mut InterpCx<'mir, 'tcx, M>, &PlaceTy<'tcx, M::Provenance>) -> InterpResult<'tcx, ()> ) -> InterpResult<'tcx, AllocId>

A helper function that allocates memory for the layout given and gives you access to mutate it. Once your own mutation code is done, the backing Allocation is removed from the current Memory and interned as read-only into the global memory.

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M>

pub(crate) fn find_closest_untracked_caller_location(&self) -> Span

Walks up the callstack from the intrinsic’s callsite, searching for the first callsite in a frame which is not #[track_caller].

pub(crate) fn alloc_caller_location( &mut self, filename: Symbol, line: u32, col: u32 ) -> MPlaceTy<'tcx, M::Provenance>

Allocate a const core::panic::Location with the provided filename and line/column numbers.

pub(crate) fn location_triple_for_span(&self, span: Span) -> (Symbol, u32, u32)

pub fn alloc_caller_location_for_span( &mut self, span: Span ) -> MPlaceTy<'tcx, M::Provenance>

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M>

pub fn emulate_intrinsic( &mut self, instance: Instance<'tcx>, args: &[OpTy<'tcx, M::Provenance>], dest: &PlaceTy<'tcx, M::Provenance>, ret: Option<BasicBlock> ) -> InterpResult<'tcx, bool>

Returns true if emulation happened. Here we implement the intrinsics that are common to all Miri instances; individual machines can add their own intrinsic handling.

pub(super) fn emulate_nondiverging_intrinsic( &mut self, intrinsic: &NonDivergingIntrinsic<'tcx> ) -> InterpResult<'tcx>

pub fn exact_div( &mut self, a: &ImmTy<'tcx, M::Provenance>, b: &ImmTy<'tcx, M::Provenance>, dest: &PlaceTy<'tcx, M::Provenance> ) -> InterpResult<'tcx>

pub fn saturating_arith( &self, mir_op: BinOp, l: &ImmTy<'tcx, M::Provenance>, r: &ImmTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, Scalar<M::Provenance>>

pub fn ptr_offset_inbounds( &self, ptr: Pointer<Option<M::Provenance>>, pointee_ty: Ty<'tcx>, offset_count: i64 ) -> InterpResult<'tcx, Pointer<Option<M::Provenance>>>

Offsets a pointer by some multiple of its type, returning an error if the pointer leaves its allocation. For integer pointers, we consider each of them their own tiny allocation of size 0, so offset-by-0 (and only 0) is okay – except that null cannot be offset by any value.

pub(crate) fn copy_intrinsic( &mut self, src: &OpTy<'tcx, <M as Machine<'mir, 'tcx>>::Provenance>, dst: &OpTy<'tcx, <M as Machine<'mir, 'tcx>>::Provenance>, count: &OpTy<'tcx, <M as Machine<'mir, 'tcx>>::Provenance>, nonoverlapping: bool ) -> InterpResult<'tcx>

Copy count*size_of::<T>() many bytes from *src to *dst.

pub(crate) fn write_bytes_intrinsic( &mut self, dst: &OpTy<'tcx, <M as Machine<'mir, 'tcx>>::Provenance>, byte: &OpTy<'tcx, <M as Machine<'mir, 'tcx>>::Provenance>, count: &OpTy<'tcx, <M as Machine<'mir, 'tcx>>::Provenance> ) -> InterpResult<'tcx>

pub(crate) fn compare_bytes_intrinsic( &mut self, left: &OpTy<'tcx, <M as Machine<'mir, 'tcx>>::Provenance>, right: &OpTy<'tcx, <M as Machine<'mir, 'tcx>>::Provenance>, byte_count: &OpTy<'tcx, <M as Machine<'mir, 'tcx>>::Provenance> ) -> InterpResult<'tcx, Scalar<M::Provenance>>

pub(crate) fn raw_eq_intrinsic( &mut self, lhs: &OpTy<'tcx, <M as Machine<'mir, 'tcx>>::Provenance>, rhs: &OpTy<'tcx, <M as Machine<'mir, 'tcx>>::Provenance> ) -> InterpResult<'tcx, Scalar<M::Provenance>>

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M>

pub fn global_base_pointer( &self, ptr: Pointer<AllocId> ) -> InterpResult<'tcx, Pointer<M::Provenance>>

Call this to turn untagged “global” pointers (obtained via tcx) into the machine pointer to the allocation. Must never be used for any other pointers, nor for TLS statics.

Using the resulting pointer represents a direct access to that memory (e.g. by directly using a static), as opposed to access through a pointer that was created by the program.

This function can fail only if ptr points to an extern static.

pub fn fn_ptr( &mut self, fn_val: FnVal<'tcx, M::ExtraFnVal> ) -> Pointer<M::Provenance>

pub fn allocate_ptr( &mut self, size: Size, align: Align, kind: MemoryKind<M::MemoryKind> ) -> InterpResult<'tcx, Pointer<M::Provenance>>

pub fn allocate_bytes_ptr( &mut self, bytes: &[u8], align: Align, kind: MemoryKind<M::MemoryKind>, mutability: Mutability ) -> InterpResult<'tcx, Pointer<M::Provenance>>

pub fn allocate_raw_ptr( &mut self, alloc: Allocation, kind: MemoryKind<M::MemoryKind> ) -> InterpResult<'tcx, Pointer<M::Provenance>>

This can fail only if alloc contains provenance.

pub fn reallocate_ptr( &mut self, ptr: Pointer<Option<M::Provenance>>, old_size_and_align: Option<(Size, Align)>, new_size: Size, new_align: Align, kind: MemoryKind<M::MemoryKind> ) -> InterpResult<'tcx, Pointer<M::Provenance>>

pub fn deallocate_ptr( &mut self, ptr: Pointer<Option<M::Provenance>>, old_size_and_align: Option<(Size, Align)>, kind: MemoryKind<M::MemoryKind> ) -> InterpResult<'tcx>

fn get_ptr_access( &self, ptr: Pointer<Option<M::Provenance>>, size: Size, align: Align ) -> InterpResult<'tcx, Option<(AllocId, Size, M::ProvenanceExtra)>>

Internal helper function to determine the allocation and offset of a pointer (if any).

pub fn check_ptr_access_align( &self, ptr: Pointer<Option<M::Provenance>>, size: Size, align: Align, msg: CheckInAllocMsg ) -> InterpResult<'tcx>

Check if the given pointer points to live memory of given size and align (ignoring M::enforce_alignment). The caller can control the error message for the out-of-bounds case.

fn check_and_deref_ptr<T>( &self, ptr: Pointer<Option<M::Provenance>>, size: Size, align: Align, check: CheckAlignment, msg: CheckInAllocMsg, alloc_size: impl FnOnce(AllocId, Size, M::ProvenanceExtra) -> InterpResult<'tcx, (Size, Align, T)> ) -> InterpResult<'tcx, Option<T>>

Low-level helper function to check if a ptr is in-bounds and potentially return a reference to the allocation it points to. Supports both shared and mutable references, as the actual checking is offloaded to a helper closure. align defines whether and which alignment check is done.

If this returns None, the size is 0; it can however return Some even for size 0.

fn check_offset_align( &self, offset: u64, align: Align, check: CheckAlignment ) -> InterpResult<'tcx>

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M>

Allocation accessors

fn get_global_alloc( &self, id: AllocId, is_write: bool ) -> InterpResult<'tcx, Cow<'tcx, Allocation<M::Provenance, M::AllocExtra, M::Bytes>>>

Helper function to obtain a global (tcx) allocation. This attempts to return a reference to an existing allocation if one can be found in tcx. That, however, is only possible if tcx and this machine use the same pointer provenance, so it is indirected through M::adjust_allocation.

pub fn alloc_base_addr(&self, id: AllocId) -> InterpResult<'tcx, *const u8>

Get the base address for the bytes in an Allocation specified by the AllocID passed in; error if no such allocation exists.

It is up to the caller to take sufficient care when using this address: there could be provenance or uninit memory in there, and other memory accesses could invalidate the exposed pointer.

fn get_alloc_raw( &self, id: AllocId ) -> InterpResult<'tcx, &Allocation<M::Provenance, M::AllocExtra, M::Bytes>>

Gives raw access to the Allocation, without bounds or alignment checks. The caller is responsible for calling the access hooks!

You almost certainly want to use get_ptr_alloc/get_ptr_alloc_mut instead.

pub fn get_ptr_alloc<'a>( &'a self, ptr: Pointer<Option<M::Provenance>>, size: Size, align: Align ) -> InterpResult<'tcx, Option<AllocRef<'a, 'tcx, M::Provenance, M::AllocExtra, M::Bytes>>>

“Safe” (bounds and align-checked) allocation access.

pub fn get_alloc_extra<'a>( &'a self, id: AllocId ) -> InterpResult<'tcx, &'a M::AllocExtra>

Return the extra field of the given allocation.

pub fn get_alloc_mutability<'a>( &'a self, id: AllocId ) -> InterpResult<'tcx, Mutability>

Return the mutability field of the given allocation.

fn get_alloc_raw_mut( &mut self, id: AllocId ) -> InterpResult<'tcx, (&mut Allocation<M::Provenance, M::AllocExtra, M::Bytes>, &mut M)>

Gives raw mutable access to the Allocation, without bounds or alignment checks. The caller is responsible for calling the access hooks!

Also returns a ptr to self.extra so that the caller can use it in parallel with the allocation.

pub fn get_ptr_alloc_mut<'a>( &'a mut self, ptr: Pointer<Option<M::Provenance>>, size: Size, align: Align ) -> InterpResult<'tcx, Option<AllocRefMut<'a, 'tcx, M::Provenance, M::AllocExtra, M::Bytes>>>

“Safe” (bounds and align-checked) allocation access.

pub fn get_alloc_extra_mut<'a>( &'a mut self, id: AllocId ) -> InterpResult<'tcx, (&'a mut M::AllocExtra, &'a mut M)>

Return the extra field of the given allocation.

pub fn get_alloc_info(&self, id: AllocId) -> (Size, Align, AllocKind)

Obtain the size and alignment of an allocation, even if that allocation has been deallocated.

fn get_live_alloc_size_and_align( &self, id: AllocId, msg: CheckInAllocMsg ) -> InterpResult<'tcx, (Size, Align)>

Obtain the size and alignment of a live allocation.

fn get_fn_alloc(&self, id: AllocId) -> Option<FnVal<'tcx, M::ExtraFnVal>>

pub fn get_ptr_fn( &self, ptr: Pointer<Option<M::Provenance>> ) -> InterpResult<'tcx, FnVal<'tcx, M::ExtraFnVal>>

pub fn get_ptr_vtable( &self, ptr: Pointer<Option<M::Provenance>> ) -> InterpResult<'tcx, (Ty<'tcx>, Option<PolyExistentialTraitRef<'tcx>>)>

pub fn alloc_mark_immutable(&mut self, id: AllocId) -> InterpResult<'tcx>

pub fn dump_alloc<'a>(&'a self, id: AllocId) -> DumpAllocs<'a, 'mir, 'tcx, M>

Create a lazy debug printer that prints the given allocation and all allocations it points to, recursively.

pub fn dump_allocs<'a>( &'a self, allocs: Vec<AllocId> ) -> DumpAllocs<'a, 'mir, 'tcx, M>

Create a lazy debug printer for a list of allocations and all allocations they point to, recursively.

pub fn find_leaked_allocations( &self, static_roots: &[AllocId] ) -> Vec<(AllocId, MemoryKind<M::MemoryKind>, Allocation<M::Provenance, M::AllocExtra, M::Bytes>)>

Find leaked allocations. Allocations reachable from static_roots or a Global allocation are not considered leaked, as well as leaks whose kind’s may_leak() returns true.

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M>

pub fn read_bytes_ptr_strip_provenance( &self, ptr: Pointer<Option<M::Provenance>>, size: Size ) -> InterpResult<'tcx, &[u8]>

Reads the given number of bytes from memory, and strips their provenance if possible. Returns them as a slice.

Performs appropriate bounds checks.

pub fn write_bytes_ptr( &mut self, ptr: Pointer<Option<M::Provenance>>, src: impl IntoIterator<Item = u8> ) -> InterpResult<'tcx>

Writes the given stream of bytes into memory.

Performs appropriate bounds checks.

pub fn mem_copy( &mut self, src: Pointer<Option<M::Provenance>>, src_align: Align, dest: Pointer<Option<M::Provenance>>, dest_align: Align, size: Size, nonoverlapping: bool ) -> InterpResult<'tcx>

pub fn mem_copy_repeatedly( &mut self, src: Pointer<Option<M::Provenance>>, src_align: Align, dest: Pointer<Option<M::Provenance>>, dest_align: Align, size: Size, num_copies: u64, nonoverlapping: bool ) -> InterpResult<'tcx>

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M>

Machine pointer introspection.

pub fn scalar_may_be_null( &self, scalar: Scalar<M::Provenance> ) -> InterpResult<'tcx, bool>

Test if this value might be null. If the machine does not support ptr-to-int casts, this is conservative.

pub fn ptr_try_get_alloc_id( &self, ptr: Pointer<Option<M::Provenance>> ) -> Result<(AllocId, Size, M::ProvenanceExtra), u64>

Turning a “maybe pointer” into a proper pointer (and some information about where it points), or an absolute address.

pub fn ptr_get_alloc_id( &self, ptr: Pointer<Option<M::Provenance>> ) -> InterpResult<'tcx, (AllocId, Size, M::ProvenanceExtra)>

Turning a “maybe pointer” into a proper pointer (and some information about where it points).

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M>

fn read_immediate_from_mplace_raw( &self, mplace: &MPlaceTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, Option<ImmTy<'tcx, M::Provenance>>>

Try reading an immediate in memory; this is interesting particularly for ScalarPair. Returns None if the layout does not permit loading this as a value.

This is an internal function; call read_immediate instead.

pub fn read_immediate_raw( &self, src: &impl Readable<'tcx, M::Provenance> ) -> InterpResult<'tcx, Either<MPlaceTy<'tcx, M::Provenance>, ImmTy<'tcx, M::Provenance>>>

Try returning an immediate for the operand. If the layout does not permit loading this as an immediate, return where in memory we can find the data. Note that for a given layout, this operation will either always return Left or Right! succeed! Whether it returns Left depends on whether the layout can be represented in an Immediate, not on which data is stored there currently.

This is an internal function that should not usually be used; call read_immediate instead. ConstProp needs it, though.

pub fn read_immediate( &self, op: &impl Readable<'tcx, M::Provenance> ) -> InterpResult<'tcx, ImmTy<'tcx, M::Provenance>>

Read an immediate from a place, asserting that that is possible with the given layout.

If this succeeds, the ImmTy is never Uninit.

pub fn read_scalar( &self, op: &impl Readable<'tcx, M::Provenance> ) -> InterpResult<'tcx, Scalar<M::Provenance>>

Read a scalar from a place

pub fn read_pointer( &self, op: &impl Readable<'tcx, M::Provenance> ) -> InterpResult<'tcx, Pointer<Option<M::Provenance>>>

Read a pointer from a place.

pub fn read_target_usize( &self, op: &impl Readable<'tcx, M::Provenance> ) -> InterpResult<'tcx, u64>

Read a pointer-sized unsigned integer from a place.

pub fn read_target_isize( &self, op: &impl Readable<'tcx, M::Provenance> ) -> InterpResult<'tcx, i64>

Read a pointer-sized signed integer from a place.

pub fn read_str( &self, mplace: &MPlaceTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, &str>

Turn the wide MPlace into a string (must already be dereferenced!)

pub fn operand_to_simd( &self, op: &OpTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, (MPlaceTy<'tcx, M::Provenance>, u64)>

Converts a repr(simd) operand into an operand where place_index accesses the SIMD elements. Also returns the number of elements.

Can (but does not always) trigger UB if op is uninitialized.

pub fn local_to_op( &self, frame: &Frame<'mir, 'tcx, M::Provenance, M::FrameExtra>, local: Local, layout: Option<TyAndLayout<'tcx>> ) -> InterpResult<'tcx, OpTy<'tcx, M::Provenance>>

Read from a local. Will not access memory, instead an indirect Operand is returned.

This is public because it is used by priroda to get an OpTy from a local.

pub fn place_to_op( &self, place: &PlaceTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, OpTy<'tcx, M::Provenance>>

Every place can be read from, so we can turn them into an operand. This will definitely return Indirect if the place is a Ptr, i.e., this will never actually read from memory.

pub fn eval_place_to_op( &self, mir_place: Place<'tcx>, layout: Option<TyAndLayout<'tcx>> ) -> InterpResult<'tcx, OpTy<'tcx, M::Provenance>>

Evaluate a place with the goal of reading from it. This lets us sometimes avoid allocations.

pub fn eval_operand( &self, mir_op: &Operand<'tcx>, layout: Option<TyAndLayout<'tcx>> ) -> InterpResult<'tcx, OpTy<'tcx, M::Provenance>>

Evaluate the operand, returning a place where you can then find the data. If you already know the layout, you can save two table lookups by passing it in here.

pub(crate) fn const_val_to_op( &self, val_val: ConstValue<'tcx>, ty: Ty<'tcx>, layout: Option<TyAndLayout<'tcx>> ) -> InterpResult<'tcx, OpTy<'tcx, M::Provenance>>

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M>

pub fn binop_with_overflow( &mut self, op: BinOp, left: &ImmTy<'tcx, M::Provenance>, right: &ImmTy<'tcx, M::Provenance>, dest: &PlaceTy<'tcx, M::Provenance> ) -> InterpResult<'tcx>

Applies the binary operation op to the two operands and writes a tuple of the result and a boolean signifying the potential overflow to the destination.

pub fn binop_ignore_overflow( &mut self, op: BinOp, left: &ImmTy<'tcx, M::Provenance>, right: &ImmTy<'tcx, M::Provenance>, dest: &PlaceTy<'tcx, M::Provenance> ) -> InterpResult<'tcx>

Applies the binary operation op to the arguments and writes the result to the destination.

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M>

fn binary_char_op( &self, bin_op: BinOp, l: char, r: char ) -> (ImmTy<'tcx, M::Provenance>, bool)

fn binary_bool_op( &self, bin_op: BinOp, l: bool, r: bool ) -> (ImmTy<'tcx, M::Provenance>, bool)

fn binary_float_op<F: Float + Into<Scalar<M::Provenance>>>( &self, bin_op: BinOp, layout: TyAndLayout<'tcx>, l: F, r: F ) -> (ImmTy<'tcx, M::Provenance>, bool)

fn binary_int_op( &self, bin_op: BinOp, l: u128, left_layout: TyAndLayout<'tcx>, r: u128, right_layout: TyAndLayout<'tcx> ) -> InterpResult<'tcx, (ImmTy<'tcx, M::Provenance>, bool)>

fn binary_ptr_op( &self, bin_op: BinOp, left: &ImmTy<'tcx, M::Provenance>, right: &ImmTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, (ImmTy<'tcx, M::Provenance>, bool)>

pub fn overflowing_binary_op( &self, bin_op: BinOp, left: &ImmTy<'tcx, M::Provenance>, right: &ImmTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, (ImmTy<'tcx, M::Provenance>, bool)>

Returns the result of the specified operation, and whether it overflowed.

pub fn wrapping_binary_op( &self, bin_op: BinOp, left: &ImmTy<'tcx, M::Provenance>, right: &ImmTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, ImmTy<'tcx, M::Provenance>>

pub fn overflowing_unary_op( &self, un_op: UnOp, val: &ImmTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, (ImmTy<'tcx, M::Provenance>, bool)>

Returns the result of the specified operation, whether it overflowed, and the result type.

pub fn wrapping_unary_op( &self, un_op: UnOp, val: &ImmTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, ImmTy<'tcx, M::Provenance>>

impl<'mir, 'tcx: 'mir, Prov, M> InterpCx<'mir, 'tcx, M>where Prov: Provenance, M: Machine<'mir, 'tcx, Provenance = Prov>,

pub fn ref_to_mplace( &self, val: &ImmTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, MPlaceTy<'tcx, M::Provenance>>

Take a value, which represents a (thin or wide) reference, and make it a place. Alignment is just based on the type. This is the inverse of mplace_to_ref().

Only call this if you are sure the place is “valid” (aligned and inbounds), or do not want to ever use the place for memory access! Generally prefer deref_pointer.

pub fn mplace_to_ref( &self, mplace: &MPlaceTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, ImmTy<'tcx, M::Provenance>>

Turn a mplace into a (thin or wide) mutable raw pointer, pointing to the same space. align information is lost! This is the inverse of ref_to_mplace.

pub fn deref_pointer( &self, src: &impl Readable<'tcx, M::Provenance> ) -> InterpResult<'tcx, MPlaceTy<'tcx, M::Provenance>>

Take an operand, representing a pointer, and dereference it to a place. Corresponds to the * operator in Rust.

pub(super) fn get_place_alloc( &self, mplace: &MPlaceTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, Option<AllocRef<'_, 'tcx, M::Provenance, M::AllocExtra, M::Bytes>>>

pub(super) fn get_place_alloc_mut( &mut self, mplace: &MPlaceTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, Option<AllocRefMut<'_, 'tcx, M::Provenance, M::AllocExtra, M::Bytes>>>

pub fn check_mplace( &self, mplace: &MPlaceTy<'tcx, M::Provenance> ) -> InterpResult<'tcx>

Check if this mplace is dereferenceable and sufficiently aligned.

pub fn mplace_to_simd( &self, mplace: &MPlaceTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, (MPlaceTy<'tcx, M::Provenance>, u64)>

Converts a repr(simd) place into a place where place_index accesses the SIMD elements. Also returns the number of elements.

pub fn place_to_simd( &mut self, place: &PlaceTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, (MPlaceTy<'tcx, M::Provenance>, u64)>

Converts a repr(simd) place into a place where place_index accesses the SIMD elements. Also returns the number of elements.

pub fn local_to_place( &self, frame: usize, local: Local ) -> InterpResult<'tcx, PlaceTy<'tcx, M::Provenance>>

pub fn eval_place( &self, mir_place: Place<'tcx> ) -> InterpResult<'tcx, PlaceTy<'tcx, M::Provenance>>

Computes a place. You should only use this if you intend to write into this place; for reading, a more efficient alternative is eval_place_to_op.

pub fn write_immediate( &mut self, src: Immediate<M::Provenance>, dest: &impl Writeable<'tcx, M::Provenance> ) -> InterpResult<'tcx>

Write an immediate to a place

pub fn write_scalar( &mut self, val: impl Into<Scalar<M::Provenance>>, dest: &impl Writeable<'tcx, M::Provenance> ) -> InterpResult<'tcx>

Write a scalar to a place

pub fn write_pointer( &mut self, ptr: impl Into<Pointer<Option<M::Provenance>>>, dest: &impl Writeable<'tcx, M::Provenance> ) -> InterpResult<'tcx>

Write a pointer to a place

fn write_immediate_no_validate( &mut self, src: Immediate<M::Provenance>, dest: &impl Writeable<'tcx, M::Provenance> ) -> InterpResult<'tcx>

Write an immediate to a place. If you use this you are responsible for validating that things got copied at the right type.

fn write_immediate_to_mplace_no_validate( &mut self, value: Immediate<M::Provenance>, layout: TyAndLayout<'tcx>, align: Align, dest: MemPlace<M::Provenance> ) -> InterpResult<'tcx>

Write an immediate to memory. If you use this you are responsible for validating that things got copied at the right layout.

pub fn write_uninit( &mut self, dest: &impl Writeable<'tcx, M::Provenance> ) -> InterpResult<'tcx>

pub fn copy_op( &mut self, src: &impl Readable<'tcx, M::Provenance>, dest: &impl Writeable<'tcx, M::Provenance>, allow_transmute: bool ) -> InterpResult<'tcx>

Copies the data from an operand to a place. allow_transmute indicates whether the layouts may disagree.

fn copy_op_no_validate( &mut self, src: &impl Readable<'tcx, M::Provenance>, dest: &impl Writeable<'tcx, M::Provenance>, allow_transmute: bool ) -> InterpResult<'tcx>

Copies the data from an operand to a place. allow_transmute indicates whether the layouts may disagree. Also, if you use this you are responsible for validating that things get copied at the right type.

pub fn force_allocation( &mut self, place: &PlaceTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, MPlaceTy<'tcx, M::Provenance>>

Ensures that a place is in memory, and returns where it is. If the place currently refers to a local that doesn’t yet have a matching allocation, create such an allocation. This is essentially force_to_memplace.

pub fn allocate_dyn( &mut self, layout: TyAndLayout<'tcx>, kind: MemoryKind<M::MemoryKind>, meta: MemPlaceMeta<M::Provenance> ) -> InterpResult<'tcx, MPlaceTy<'tcx, M::Provenance>>

pub fn allocate( &mut self, layout: TyAndLayout<'tcx>, kind: MemoryKind<M::MemoryKind> ) -> InterpResult<'tcx, MPlaceTy<'tcx, M::Provenance>>

pub fn allocate_str( &mut self, str: &str, kind: MemoryKind<M::MemoryKind>, mutbl: Mutability ) -> InterpResult<'tcx, MPlaceTy<'tcx, M::Provenance>>

Returns a wide MPlace of type &'static [mut] str to a new 1-aligned allocation.

pub fn write_aggregate( &mut self, kind: &AggregateKind<'tcx>, operands: &IndexSlice<FieldIdx, Operand<'tcx>>, dest: &PlaceTy<'tcx, M::Provenance> ) -> InterpResult<'tcx>

Writes the aggregate to the destination.

pub fn raw_const_to_mplace( &self, raw: ConstAlloc<'tcx> ) -> InterpResult<'tcx, MPlaceTy<'tcx, M::Provenance>>

pub(super) fn unpack_dyn_trait( &self, mplace: &MPlaceTy<'tcx, M::Provenance> ) -> InterpResult<'tcx, (MPlaceTy<'tcx, M::Provenance>, Pointer<Option<M::Provenance>>)>

Turn a place with a dyn Trait type into a place with the actual dynamic type. Aso returns the vtable.

pub(super) fn unpack_dyn_star<P: Projectable<'tcx, M::Provenance>>( &self, val: &P ) -> InterpResult<'tcx, (P, Pointer<Option<M::Provenance>>)>

Turn a dyn* Trait type into an value with the actual dynamic type. Also returns the vtable.

impl<'mir, 'tcx: 'mir, Prov, M> InterpCx<'mir, 'tcx, M>where Prov: Provenance, M: Machine<'mir, 'tcx, Provenance = Prov>,

pub fn project_field<P: Projectable<'tcx, M::Provenance>>( &self, base: &P, field: usize ) -> InterpResult<'tcx, P>

Offset a pointer to project to a field of a struct/union. Unlike place_field, this is always possible without allocating, so it can take &self. Also return the field’s layout. This supports both struct and array fields, but not slices!

This also works for arrays, but then the usize index type is restricting. For indexing into arrays, use mplace_index.

pub fn project_downcast<P: Projectable<'tcx, M::Provenance>>( &self, base: &P, variant: VariantIdx ) -> InterpResult<'tcx, P>

Downcasting to an enum variant.

pub fn project_index<P: Projectable<'tcx, M::Provenance>>( &self, base: &P, index: u64 ) -> InterpResult<'tcx, P>

Compute the offset and field layout for accessing the given index.

fn project_constant_index<P: Projectable<'tcx, M::Provenance>>( &self, base: &P, offset: u64, min_length: u64, from_end: bool ) -> InterpResult<'tcx, P>

pub fn project_array_fields<'a, P: Projectable<'tcx, M::Provenance>>( &self, base: &'a P ) -> InterpResult<'tcx, ArrayIterator<'tcx, 'a, M::Provenance, P>>

Iterates over all fields of an array. Much more efficient than doing the same by repeatedly calling operand_index.

fn project_subslice<P: Projectable<'tcx, M::Provenance>>( &self, base: &P, from: u64, to: u64, from_end: bool ) -> InterpResult<'tcx, P>

Subslicing

pub fn project<P>( &self, base: &P, proj_elem: PlaceElem<'tcx> ) -> InterpResult<'tcx, P>where P: Projectable<'tcx, M::Provenance> + From<MPlaceTy<'tcx, M::Provenance>> + Debug,

Applying a general projection

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M>

pub fn step(&mut self) -> InterpResult<'tcx, bool>

Returns true as long as there are more things to do.

This is used by priroda

This is marked #inline(always) to work around adversarial codegen when opt-level = 3

pub fn statement(&mut self, stmt: &Statement<'tcx>) -> InterpResult<'tcx>

Runs the interpretation logic for the given mir::Statement at the current frame and statement counter.

This does NOT move the statement counter forward, the caller has to do that!

pub fn eval_rvalue_into_place( &mut self, rvalue: &Rvalue<'tcx>, place: Place<'tcx> ) -> InterpResult<'tcx>

Evaluate an assignment statement.

There is no separate eval_rvalue function. Instead, the code for handling each rvalue type writes its results directly into the memory specified by the place.

fn terminator(&mut self, terminator: &Terminator<'tcx>) -> InterpResult<'tcx>

Evaluate the given terminator. Will also adjust the stack frame and statement position accordingly.

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M>

pub fn copy_fn_arg( &self, arg: &FnArg<'tcx, M::Provenance> ) -> InterpResult<'tcx, OpTy<'tcx, M::Provenance>>

Make a copy of the given fn_arg. Any InPlace are degenerated to copies, no protection of the original memory occurs.

pub fn copy_fn_args( &self, args: &[FnArg<'tcx, M::Provenance>] ) -> InterpResult<'tcx, Vec<OpTy<'tcx, M::Provenance>>>

Make a copy of the given fn_args. Any InPlace are degenerated to copies, no protection of the original memory occurs.

pub fn fn_arg_field( &self, arg: &FnArg<'tcx, M::Provenance>, field: usize ) -> InterpResult<'tcx, FnArg<'tcx, M::Provenance>>

pub(super) fn eval_terminator( &mut self, terminator: &Terminator<'tcx> ) -> InterpResult<'tcx>

pub(super) fn eval_fn_call_arguments( &self, ops: &[Operand<'tcx>] ) -> InterpResult<'tcx, Vec<FnArg<'tcx, M::Provenance>>>

Evaluate the arguments of a function call

fn unfold_transparent( &self, layout: TyAndLayout<'tcx>, may_unfold: impl Fn(AdtDef<'tcx>) -> bool ) -> TyAndLayout<'tcx>

Find the wrapped inner type of a transparent wrapper. Must not be called on 1-ZST (as they don’t have a uniquely defined “wrapped field”).

We work with TyAndLayout here since that makes it much easier to iterate over all fields.

fn unfold_npo( &self, layout: TyAndLayout<'tcx> ) -> InterpResult<'tcx, TyAndLayout<'tcx>>

Unwrap types that are guaranteed a null-pointer-optimization

fn layout_compat( &self, caller: TyAndLayout<'tcx>, callee: TyAndLayout<'tcx> ) -> InterpResult<'tcx, bool>

Check if these two layouts look like they are fn-ABI-compatible. (We also compare the PassMode, so this doesn’t have to check everything. But it turns out that only checking the PassMode is insufficient.)

fn check_argument_compat( &self, caller_abi: &ArgAbi<'tcx, Ty<'tcx>>, callee_abi: &ArgAbi<'tcx, Ty<'tcx>> ) -> InterpResult<'tcx, bool>

fn pass_argument<'x, 'y>( &mut self, caller_args: &mut impl Iterator<Item = (&'x FnArg<'tcx, M::Provenance>, &'y ArgAbi<'tcx, Ty<'tcx>>)>, callee_abi: &ArgAbi<'tcx, Ty<'tcx>>, callee_arg: &Place<'tcx>, callee_ty: Ty<'tcx>, already_live: bool ) -> InterpResult<'tcx>where 'tcx: 'x + 'y,

Initialize a single callee argument, checking the types for compatibility.

pub(crate) fn eval_fn_call( &mut self, fn_val: FnVal<'tcx, M::ExtraFnVal>, (caller_abi, caller_fn_abi): (Abi, &FnAbi<'tcx, Ty<'tcx>>), args: &[FnArg<'tcx, M::Provenance>], with_caller_location: bool, destination: &PlaceTy<'tcx, M::Provenance>, target: Option<BasicBlock>, unwind: UnwindAction ) -> InterpResult<'tcx>

Call this function – pushing the stack frame and initializing the arguments.

caller_fn_abi is used to determine if all the arguments are passed the proper way. However, we also need caller_abi to determine if we need to do untupling of arguments.

with_caller_location indicates whether the caller passed a caller location. Miri implements caller locations without argument passing, but to match FnAbi we need to know when those arguments are present.

fn check_fn_target_features( &self, instance: Instance<'tcx> ) -> InterpResult<'tcx, ()>

fn drop_in_place( &mut self, place: &PlaceTy<'tcx, M::Provenance>, instance: Instance<'tcx>, target: BasicBlock, unwind: UnwindAction ) -> InterpResult<'tcx>

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M>

pub fn get_vtable_ptr( &self, ty: Ty<'tcx>, poly_trait_ref: Option<PolyExistentialTraitRef<'tcx>> ) -> InterpResult<'tcx, Pointer<Option<M::Provenance>>>

Creates a dynamic vtable for the given type and vtable origin. This is used only for objects.

The trait_ref encodes the erased self type. Hence, if we are making an object Foo<Trait> from a value of type Foo<T>, then trait_ref would map T: Trait. None here means that this is an auto trait without any methods, so we only need the basic vtable (drop, size, align).

pub fn get_vtable_entries( &self, vtable: Pointer<Option<M::Provenance>> ) -> InterpResult<'tcx, &'tcx [VtblEntry<'tcx>]>

Returns a high-level representation of the entries of the given vtable.

pub fn get_vtable_size_and_align( &self, vtable: Pointer<Option<M::Provenance>> ) -> InterpResult<'tcx, (Size, Align)>

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M>

fn validate_operand_internal( &self, op: &OpTy<'tcx, M::Provenance>, path: Vec<PathElem>, ref_tracking: Option<&mut RefTracking<MPlaceTy<'tcx, M::Provenance>, Vec<PathElem>>>, ctfe_mode: Option<CtfeValidationMode> ) -> InterpResult<'tcx>

pub fn const_validate_operand( &self, op: &OpTy<'tcx, M::Provenance>, path: Vec<PathElem>, ref_tracking: &mut RefTracking<MPlaceTy<'tcx, M::Provenance>, Vec<PathElem>>, ctfe_mode: CtfeValidationMode ) -> InterpResult<'tcx>

This function checks the data at op to be const-valid. op is assumed to cover valid memory if it is an indirect operand. It will error if the bits at the destination do not match the ones described by the layout.

ref_tracking is used to record references that we encounter so that they can be checked recursively by an outside driving loop.

constant controls whether this must satisfy the rules for constants:

• no pointers to statics.
• no UnsafeCell or non-ZST &mut.

pub fn validate_operand( &self, op: &OpTy<'tcx, M::Provenance> ) -> InterpResult<'tcx>

This function checks the data at op to be runtime-valid. op is assumed to cover valid memory if it is an indirect operand. It will error if the bits at the destination do not match the ones described by the layout.

Trait Implementations

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> FnAbiOfHelpers<'tcx> for InterpCx<'mir, 'tcx, M>

type FnAbiOfResult = Result<&'tcx FnAbi<'tcx, Ty<'tcx>>, InterpErrorInfo<'tcx>>

The &FnAbi-wrapping type (or &FnAbi itself), which will be returned from fn_abi_of_* (see also handle_fn_abi_err).

fn handle_fn_abi_err( &self, err: FnAbiError<'tcx>, _span: Span, _fn_abi_request: FnAbiRequest<'tcx> ) -> InterpErrorInfo<'tcx>

Helper used for fn_abi_of_*, to adapt tcx.fn_abi_of_*(...) into a Self::FnAbiOfResult (which does not need to be a Result<...>).

impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> HasDataLayout for InterpCx<'mir, 'tcx, M>

fn data_layout(&self) -> &TargetDataLayout

impl<'mir, 'tcx, M> HasParamEnv<'tcx> for InterpCx<'mir, 'tcx, M>where M: Machine<'mir, 'tcx>,

fn param_env(&self) -> ParamEnv<'tcx>

impl<'mir, 'tcx, M> HasTyCtxt<'tcx> for InterpCx<'mir, 'tcx, M>where M: Machine<'mir, 'tcx>,

fn tcx(&self) -> TyCtxt<'tcx>

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> LayoutOfHelpers<'tcx> for InterpCx<'mir, 'tcx, M>

type LayoutOfResult = Result<TyAndLayout<'tcx, Ty<'tcx>>, InterpErrorInfo<'tcx>>

The TyAndLayout-wrapping type (or TyAndLayout itself), which will be returned from layout_of (see also handle_layout_err).

fn layout_tcx_at_span(&self) -> Span

Span to use for tcx.at(span), from layout_of.

fn handle_layout_err( &self, err: LayoutError<'tcx>, _: Span, _: Ty<'tcx> ) -> InterpErrorInfo<'tcx>

Helper used for layout_of, to adapt tcx.layout_of(...) into a Self::LayoutOfResult (which does not need to be a Result<...>).

Layout

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.