Stream: git-wasmtime

Topic: wasmtime / PR #4887 Cherry-pick #4882 to 1.0.0 release br...

Wasmtime GitHub notifications bot (Sep 08 2022 at 17:12):

cfallin opened PR #4887 from release-1.0.0-pr4882 to release-1.0.0:

This is a cherry-pick of "Cranelift: add a vreg limit check to correctly return an error on too-large inputs. (#4882)"

This is a low-risk PR that provides a clean error on a too-large Wasm input, rather than panicking; this seems like
an important user-experience improvement for the upcoming release.

Previously, Cranelift panicked (via a a panic in regalloc2) when the virtual-register limit of 2M (2^21) was reached. This resulted in a perplexing and unhelpful failure when the user provided a too-large input (such as the Wasm module in #4865).

This PR adds an explicit check when allocating vregs that fails with a "code too large" error when the limit is hit, producing output such as (on the minimized testcase from #4865):

Error: failed to compile wasm function 3785 at offset 0xa3f3

Caused by:
    Compilation error: Code for function is too large

Fixes #4865.

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Wasmtime GitHub notifications bot (Sep 08 2022 at 17:12):

cfallin requested alexcrichton for a review on PR #4887.

Wasmtime GitHub notifications bot (Sep 08 2022 at 17:12):

cfallin requested fitzgen for a review on PR #4887.

Wasmtime GitHub notifications bot (Sep 08 2022 at 17:17):

alexcrichton submitted PR review.

Wasmtime GitHub notifications bot (Sep 08 2022 at 18:07):

cfallin merged PR #4887.

Last updated: Dec 23 2024 at 12:05 UTC