Struct cranelift_codegen::PatchRegion

pub struct PatchRegion { /* private fields */ }

A region in the MachBuffer code buffer that can be edited prior to finalization. An example of where you might want to use this is for patching instructions that mention constants that won’t be known until later: MachBuffer::start_patchable can be used to begin the patchable region, instructions can be emitted with placeholder constants, and the PatchRegion token can be produced by MachBuffer::end_patchable. Once the values of those constants are known, the PatchRegion::patch function can be used to get a mutable buffer to the instruction bytes, and the constants uses can be updated directly.

Implementations

impl PatchRegion

pub fn patch<I: VCodeInst>(self, buffer: &mut MachBuffer<I>) -> &mut [u8]

Consume the patch region to yield a mutable slice of the MachBuffer data buffer.