[][src]Struct rustc_mir::interpret::EvalContext

pub struct EvalContext<'a, 'mir, 'tcx: 'a + 'mir, M: Machine<'mir, 'tcx>> {
    pub machine: M,
    pub tcx: TyCtxtAt<'a, 'tcx, 'tcx>,
    pub param_env: ParamEnv<'tcx>,
    pub memory: Memory<'a, 'mir, 'tcx, M>,
    pub(crate) stack: Vec<Frame<'mir, 'tcx>>,
    pub(super) stack_limit: usize,
    pub(super) steps_since_detector_enabled: isize,
    pub(super) loop_detector: InfiniteLoopDetector<'a, 'mir, 'tcx, M>,
}
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Fields

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Stores the Machine instance.

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The results of the type checker, from rustc.

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Bounds in scope for polymorphic evaluations.

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The virtual memory system.

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The virtual call stack.

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The maximum number of stack frames allowed

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When this value is negative, it indicates the number of interpreter steps until the loop detector is enabled. When it is positive, it is the number of steps after the detector has been enabled modulo the loop detector period.

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Extra state to detect loops. FIXME: Move this to the CTFE machine's state, out of the general miri engine.

Methods

impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M>
[src]

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impl<'a, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M>
[src]

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Important traits for &'a [u8]

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Mark a storage as live, killing the previous content and returning it. Remember to deallocate that!

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Returns the old value of the local. Remember to deallocate that!

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Return the actual dynamic size and alignment of the place at the given type. Only the "extra" (metadata) part of the place matters.

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impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M>
[src]

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

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Offset a pointer to project to a field. 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.

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Project into an mplace

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Get the place of a field inside the place, and also the field's type. Just a convenience function, but used quite a bit.

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Project into a place

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Evaluate statics and promoteds to an MPlace. Used to share some code between eval_place and eval_place_to_op.

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

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Write a scalar to a place

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Write a value to a place

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Write a value to memory

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Copy the data from an operand to a place

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Make sure that a place is in memory, and return where it is. This is essentially force_to_memplace.

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Every place can be read from, so we can turm them into an operand

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Turn a place with a dyn Trait type into a place with the actual dynamic type. Also return some more information so drop doesn't have to run the same code twice.

impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M>
[src]

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Try reading a value in memory; this is interesting particularily for ScalarPair. Return None if the layout does not permit loading this as a value.

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

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

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Read a scalar from a place

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Projection functions

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

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Evaluate a bunch of operands at once

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Read discriminant, return the runtime value as well as the variant index.

impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M>
[src]

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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.

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

impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M>
[src]

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Convenience wrapper that's useful when keeping the layout together with the value.

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

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impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M>
[src]

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

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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.

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impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M>
[src]

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Pass a single argument, checking the types for compatibility.

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

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impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M>
[src]

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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.

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Return the drop fn instance as well as the actual dynamic type

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impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M>
[src]

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This function checks the data at op. It will error if the bits at the destination do not match the ones described by the layout. The path may be pushed to, but the part that is present when the function starts must not be changed!

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impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M>
[src]

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Returns whether emulation happened.

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"Intercept" a function call because we have something special to do for it. Returns whether an intercept happened.

Trait Implementations

impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> HasDataLayout for &'a EvalContext<'a, 'mir, 'tcx, M>
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

impl<'a, 'mir, 'tcx, M> HasTyCtxt<'tcx> for &'a EvalContext<'a, 'mir, 'tcx, M> where
    M: Machine<'mir, 'tcx>, 
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> LayoutOf for &'a EvalContext<'a, 'mir, 'tcx, M>
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Auto Trait Implementations

impl<'a, 'mir, 'tcx, M> !Send for EvalContext<'a, 'mir, 'tcx, M>

impl<'a, 'mir, 'tcx, M> !Sync for EvalContext<'a, 'mir, 'tcx, M>

Blanket Implementations

impl<T> From for T
[src]

Performs the conversion.

impl<T, U> Into for T where
    U: From<T>, 
[src]

Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
[src]

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T> Borrow for T where
    T: ?Sized
[src]

Important traits for &'a mut R

Immutably borrows from an owned value. Read more

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
[src]

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T> BorrowMut for T where
    T: ?Sized
[src]

Important traits for &'a mut R

Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
[src]

🔬 This is a nightly-only experimental API. (get_type_id)

this method will likely be replaced by an associated static

Gets the TypeId of self. Read more

impl<E> SpecializationError for E
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S is the encoder/decoder state type, T is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more

impl<T> Erased for T
[src]

impl<T> Send for T where
    T: ?Sized
[src]

impl<T> Sync for T where
    T: ?Sized
[src]

impl<T> Erased for T

impl<T> MaybeResult for T
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

impl<'a, T> Captures for T where
    T: ?Sized
[src]