Emit retags in codegen to support BorrowSanitizer (part 4)#158100
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icmccorm wants to merge 3 commits into
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Emit retags in codegen to support BorrowSanitizer (part 4)#158100icmccorm wants to merge 3 commits into
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saethlin
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Jun 21, 2026
| ) -> Option<RetagPlan<Bx::Value>> { | ||
| None | ||
| let tcx = bx.tcx(); | ||
| let opts = tcx.sess.opts.unstable_opts.codegen_emit_retag.unwrap_or_default(); |
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Isn't opts unused?
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Oh, you've allowed the lint for this module because the plumbing was incomplete. I suspect now is probably a good time to remove the allow?
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Tracking issue: #154760
Zulip Thread
This is one of several PRs that add experimental support for emitting retags as function calls in codegen.
This PR emits our retag intrinsics based on the structure of a
RetagPlan. The feature works end-to-end now! But, it has two limitations:We do not track interior mutable or pinned ranges precisely. This will come in the next PR, which should be the last one that we need to complete this feature (excluding documentation and compile tests).
We recurse into
repr(simd)types when building aRetagPlan, but we do not emit retags for their fields. We would needBuilderMethods::insert_element, which isn't available. I'm not sure what the best workaround would be for this.Related: #157825, #156210, #156208
Cc: @RalfJung
r? @saethlin