Struct miri::borrow_tracker::tree_borrows::perms::PermTransition

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pub struct PermTransition {
    from: PermissionPriv,
    to: PermissionPriv,
}
Expand description

Transition from one permission to the next.

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§from: PermissionPriv§to: PermissionPriv

Implementations§

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impl PermTransition

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pub fn summary(&self) -> &'static str

Readable explanation of the consequences of an event. Fits in the sentence “This accessed caused {trans.summary()}”.

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pub(in borrow_tracker::tree_borrows) fn is_relevant( &self, err: TransitionError ) -> bool

Determines whether self is a relevant transition for the error err. self will be a transition that happened to a tag some time before that tag caused the error.

Irrelevant events:

  • modifications of write permissions when the error is related to read permissions (on failed reads and protected Frozen -> Disabled, ignore Reserved -> Active, Reserved(conflicted=false) -> Reserved(conflicted=true), and Active -> Frozen)
  • all transitions for attempts to deallocate strongly protected tags
§Panics

This function assumes that its arguments apply to the same location and that they were obtained during a normal execution. It will panic otherwise.

  • all transitions involved in self and err should be increasing (Reserved < Active < Frozen < Disabled);
  • between self and err the permission should also be increasing, so all permissions inside err should be greater than self.1;
  • Active and Reserved(conflicted=false) cannot cause an error due to insufficient permissions, so err cannot be a ChildAccessForbidden(_) of either of them;
  • err should not be ProtectedDisabled(Disabled), because the protected tag should not have been Disabled in the first place (if this occurs it means we have unprotected tags that become protected)
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pub fn endpoint(&self) -> Permission

Endpoint of a transition. Meant only for diagnostics, use applied in non-diagnostics code, which also checks that the starting point matches the current state.

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impl PermTransition

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fn is_possible(self) -> bool

All transitions created through normal means (using perform_access) should be possible, but the same is not guaranteed by construction of transitions inferred by diagnostics. This checks that a transition reconstructed by diagnostics is indeed one that could happen.

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pub fn from(from: Permission, to: Permission) -> Option<Self>

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pub fn is_noop(self) -> bool

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pub fn applied(self, starting_point: Permission) -> Option<Permission>

Extract result of a transition (checks that the starting point matches).

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pub fn started(self) -> Permission

Extract starting point of a transition

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pub fn produces_disabled(self) -> bool

Determines if this transition would disable the permission.

Trait Implementations§

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impl Clone for PermTransition

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fn clone(&self) -> PermTransition

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for PermTransition

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Display for PermTransition

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl PartialEq for PermTransition

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fn eq(&self, other: &PermTransition) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Copy for PermTransition

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impl Eq for PermTransition

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impl StructuralPartialEq for PermTransition

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Size: 4 bytes