Enum rustc_const_eval::interpret::GlobalAlloc

source · [−]
pub enum GlobalAlloc<'tcx> {
    Function(Instance<'tcx>),
    VTable(Ty<'tcx>, Option<Binder<'tcx, ExistentialTraitRef<'tcx>>>),
    Static(DefId),
    Memory(ConstAllocation<'tcx, AllocId, ()>),
}
Expand description

An allocation in the global (tcx-managed) memory can be either a function pointer, a static, or a “real” allocation with some data in it.

Variants

Function(Instance<'tcx>)

The alloc ID is used as a function pointer.

VTable(Ty<'tcx>, Option<Binder<'tcx, ExistentialTraitRef<'tcx>>>)

This alloc ID points to a symbolic (not-reified) vtable.

Static(DefId)

The alloc ID points to a “lazy” static variable that did not get computed (yet). This is also used to break the cycle in recursive statics.

Memory(ConstAllocation<'tcx, AllocId, ()>)

The alloc ID points to memory.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

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

The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.

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: 40 bytes

Size for each variant:

  • Function: 36 bytes
  • VTable: 36 bytes
  • Static: 8 bytes
  • Memory: 12 bytes