Enum rustc_mir::transform::add_call_guards::AddCallGuards

pub enum AddCallGuards {
    AllCallEdges,
    CriticalCallEdges,
}

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

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Variants

AllCallEdges

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

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CriticalCallEdges

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

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Methods

impl AddCallGuards

pub fn add_call_guards(&self, mir: &mut Mir)

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

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Trait Implementations

impl PartialEq for AddCallGuards

fn eq(&self, __arg_0: &AddCallGuards) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl MirPass for AddCallGuards

Breaks outgoing critical edges for call terminators in the MIR.

Critical edges are edges that are neither the only edge leaving a block, nor the only edge entering one.

When you want something to happen "along" an edge, you can either do at the end of the predecessor block, or at the start of the successor block. Critical edges have to be broken in order to prevent "edge actions" from affecting other edges. We need this for calls that are translated to LLVM invoke instructions, because invoke is a block terminator in LLVM so we can't insert any code to handle the call's result into the block that performs the call.

This function will break those edges by inserting new blocks along them.

NOTE: Simplify CFG will happily undo most of the work this pass does.

fn run_pass<'a, 'tcx>(     &self,     _tcx: TyCtxt<'a, 'tcx, 'tcx>,     _src: MirSource,     mir: &mut Mir<'tcx> )

🔬 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?

fn name<'a>(&'a self) -> Cow<'a, str>

🔬 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?