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fix(stdlib): decode EthAddress, FunctionSelector and wrapped field structs in AbiDecoder#21926

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benesjan merged 3 commits intomerge-train/fairiesfrom
be/fix-eth-address-decoding
Mar 24, 2026
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fix(stdlib): decode EthAddress, FunctionSelector and wrapped field structs in AbiDecoder#21926
benesjan merged 3 commits intomerge-train/fairiesfrom
be/fix-eth-address-decoding

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@benesjan benesjan commented Mar 24, 2026

Summary

  • Fixes AbiDecoder to properly decode EthAddress, FunctionSelector, and wrapped field structs (single inner: Field) as their corresponding TS types (EthAddress, FunctionSelector, Fr) instead of generic { inner: bigint } objects
  • Extracts FunctionSignatureDecoder into its own file to break a circular dependency between decoder.ts and function_selector.ts
  • Adds e2e tests for decoding EthAddress, FunctionSelector, and wrapped field return values
  • Adds unit tests for EthAddress decoding, wrapped field decoding, and EthAddress nested inside a larger struct
  • Adds return_eth_address, return_function_selector, and return_wrapped_field utility functions to the AbiTypes test contract

Fixes https://linear.app/aztec-labs/issue/F-482/bug-abidecoder-doesnt-decode-ethaddress-properly
Closes #21878

🤖 Generated with Claude Code

The AbiDecoder was decoding EthAddress as a generic struct `{ inner: bigint }`
instead of an EthAddress instance, causing type mismatches with generated
TypeScript types that use EthAddressLike. Also adds decoding for wrapped
field structs (single `inner` field) as Fr.

Closes F-482

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
@benesjan benesjan force-pushed the be/fix-eth-address-decoding branch from 10c872c to 4fff08c Compare March 24, 2026 05:47
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@benesjan benesjan changed the title fix(stdlib): decode EthAddress and wrapped field structs in AbiDecoder fix(stdlib): decode EthAddress, FunctionSelector, and wrapped field structs in AbiDecoder Mar 24, 2026
Comment thread yarn-project/stdlib/src/abi/decoder.ts
Comment thread yarn-project/stdlib/src/abi/function_signature_decoder.ts
Comment thread yarn-project/stdlib/src/abi/decoder.ts
@benesjan benesjan requested a review from Thunkar March 24, 2026 07:49
@benesjan benesjan changed the title fix(stdlib): decode EthAddress, FunctionSelector, and wrapped field structs in AbiDecoder fix(stdlib): decode EthAddress, FunctionSelector and wrapped field structs in AbiDecoder Mar 24, 2026
@benesjan benesjan merged commit 46ede19 into merge-train/fairies Mar 24, 2026
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@benesjan benesjan deleted the be/fix-eth-address-decoding branch March 24, 2026 10:06
AztecBot pushed a commit that referenced this pull request Mar 24, 2026
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✅ Successfully backported to backport-to-v4-next-staging #21899.

AztecBot added a commit that referenced this pull request Mar 25, 2026
BEGIN_COMMIT_OVERRIDE
fix(aztec-up): narrow PATH cleanup regex to avoid removing user PATH
entries (#21828)
fix: consolidate blob source test into single summary log with supernode
detection (#21719)
fix: use anchor block on getL1ToL2MsgWitness (#21872)
fix: make sure queries are not made ahead of the anchor block (#21874)
chore(docs): backport docs infrastructure changes to v4 (#21437)
chore: backport PR #21836 (fix: explicitly handle initial block case for
getBlockHashMembershipWitness) to v4-next (#21891)
chore: backport PR #21813 (fix(aztec-up): strip leading v prefix from
version strings) to v4-next (#21912)
docs: document defi-wonderland immutable macro (#21764)
fix: pin typescript and harden lockfile check in docs examples CI (v4
backport) (#21914)
docs: expand circuit profiling guide and document kernel gate cost
overhead (#21770)
feat: cli-wallet (#21757)
chore: sync backport staging with v4-next HEAD (#21931)
fix: bot gas estimations (backport #21945) (#21947)
refactor(aztec-nr): use logging wrappers in
compute_note_hash_and_nullifier (#21897)
fix: backport v4 next staging (#21934)
fix: make PXE#getSyncedBlockHeader a concurrency=1 job to prevent IDB tx
liveness issues (#21944)
feat: add error page mapping for incompatible oracles (#21943)
fix(aztec-up): validate semver in uninstall to prevent path traversal
(#21892)
chore: merge v4-next into backport staging (fix ancestry) (#21954)
fix(aztec-up): add truncation protection to install scripts (#21896)
fix: noir format in compute_note_hash_and_nullifier.nr (#21956)
fix(stdlib): decode `EthAddress`, `FunctionSelector` and wrapped field
structs in `AbiDecoder` (#21926)
chore: update noir to nightly-2026-02-12-patch.1 (#21960)
fix: ensure empty docs examples does not populate yarn lock backport
(#21963)
fix: docs examples does not build on simple bootstrap backport (#21964)
fix: add rc/testnet version detection to API reference pages (#21966)
docs: document EmbeddedWallet automatic gas estimation and private
authwits (#21790)
fix(pxe): robust error handling in message processing (backport #21093)
(#21981)
chore: manually recreate backport (#21969)
chore: (A-779) load all accounts before calling
LogService.#getSecretsForSenders (#21923)
END_COMMIT_OVERRIDE
github-merge-queue Bot pushed a commit that referenced this pull request Mar 25, 2026
BEGIN_COMMIT_OVERRIDE
fix: interactions clean up (#21933)
fix(stdlib): decode `EthAddress`, `FunctionSelector` and wrapped field
structs in `AbiDecoder` (#21926)
fix: bot gas estimations (#21945)
refactor(aztec-nr): use logging wrappers in
compute_note_hash_and_nullifier (#21897)
feat: add error page mapping for incompatible oracles (#21943)
fix(pxe): robust error handling in message processing (#21093)
fix: make PXE#getSyncedBlockHeader a concurrency=1 job to prevent IDB tx
liveness issues (#21944)
fix(aztec-up): validate semver in uninstall to prevent path traversal
(#21892)
fix(aztec-up): add truncation protection to install scripts (#21896)
feat!: scoped capsules (#21533)
END_COMMIT_OVERRIDE
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