feat(evm-simulation): ecrecover precompile override for signature simulation#806
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feat(evm-simulation): ecrecover precompile override for signature simulation#806Foulks-Plb wants to merge 1 commit into
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… simulation Add `SimulateParams.ecrecoverOverride` to simulate signature-gated calls (e.g. EIP-2612 permit) without a real signature. Both backends install an ecrecover shim at 0x…0001 via a `code` state-override so signature recovery resolves to the given address; Tenderly also relocates the genuine precompile via `movePrecompileToAddress`, while the eth_simulateV1 fallback installs the shim only (viem's serializer drops the relocation field). Exports buildEcrecoverShimCode and the precompile/relocation address constants. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Motivation
Simulating a signature-gated call (e.g. an EIP-2612
permit) previously required a real signature or prepending anapprove()authorization. To preview such flows without a signature, theecrecoverprecompile must be overridden so the on-chain signature check resolves to the expected signer.Solution
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SimulateParams.ecrecoverOverridethat installs anecrecovershim at0x…0001on both backends via acodestate-override (PUSH20 <owner>; MSTORE; RETURN), making signature recovery resolve to that address. The Tenderly backend also relocates the genuine precompile viamovePrecompileToAddress; theeth_simulateV1fallback installs the shim only, because viem 2.52's state-override serializer drops the relocation field — behaviourally identical for standard contracts that call0x…0001directly. The param is threaded through the pipeline (including the Tenderly→V1 fallback), validated against malformed/zero addresses, and exported alongsidebuildEcrecoverShimCodeand the precompile/relocation address constants, with full unit coverage and a minor changeset.