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YJIT: Use raw memory write to update pointers in code

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Because we have set all code memory to writable before the reference
updating phase, we can use raw memory writes directly.
This commit is contained in:
Kunshan Wang 2025-07-19 16:22:46 +08:00 • committed by Alan Wu
parent fd492a45eb
commit 5ef20b3a27
1 changed files with 3 additions and 5 deletions
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8
yjit/src/core.rs
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@ -2091,11 +2091,9 @@ pub extern "C" fn rb_yjit_iseq_update_references(iseq: IseqPtr) {
// Only write when the VALUE moves, to be copy-on-write friendly. // Only write when the VALUE moves, to be copy-on-write friendly.
if new_addr != object { if new_addr != object {
for (byte_idx, &byte) in new_addr.as_u64().to_le_bytes().iter().enumerate() { // SAFETY: Since we already set code memory writable before the compacting phase,
let byte_code_ptr = value_code_ptr.add_bytes(byte_idx); // we can use raw memory accesses directly.
cb.write_mem(byte_code_ptr, byte) unsafe { value_ptr.write_unaligned(new_addr); }
.expect("patching existing code should be within bounds");
}
} }
} }
} }