Address review

cannon/mipsevm/witness.go

@@ -27,6 +27,12 @@ func uint32ToBytes32(v uint32) []byte {
 	return out[:]
 }
 
+func uint64ToBytes32(v uint64) []byte {
+	var out [32]byte
+	binary.BigEndian.PutUint64(out[32-8:], v)
+	return out[:]
+}
+
 func (wit *StepWitness) EncodeStepInput(localContext LocalContext) []byte {
 	abiStateLen := len(wit.State)
 	if abiStateLen%32 != 0 {
@@ -40,7 +46,7 @@ func (wit *StepWitness) EncodeStepInput(localContext LocalContext) []byte {
 	input = append(input, StepBytes4...)
 	input = append(input, uint32ToBytes32(32*3)...)                          // state data offset in bytes
 	input = append(input, uint32ToBytes32(32*3+32+uint32(len(abiState)))...) // proof data offset in bytes
-	input = append(input, uint32ToBytes32(uint32(localContext))...)          // local context in bytes
+	input = append(input, uint64ToBytes32(uint64(localContext))...)          // local context in bytes
 
 	input = append(input, uint32ToBytes32(uint32(len(wit.State)))...) // state data length in bytes
 	input = append(input, abiState[:]...)
@@ -66,7 +72,7 @@ func (wit *StepWitness) EncodePreimageOracleInput(localContext LocalContext) ([]
 		var input []byte
 		input = append(input, LoadLocalDataBytes4...)
 		input = append(input, wit.PreimageKey[:]...)
-		input = append(input, uint32ToBytes32(uint32(localContext))...) // local context in bytes
+		input = append(input, uint64ToBytes32(uint64(localContext))...) // local context in bytes
 
 		preimagePart := wit.PreimageValue[8:]
 		var tmp [32]byte

packages/contracts-bedrock/.gas-snapshot

@@ -659,7 +659,7 @@ SequencerFeeVault_Test:test_withdraw_toL1_succeeds() (gas: 171675)
 SetPrevBaseFee_Test:test_setPrevBaseFee_succeeds() (gas: 11549)
 StandardBridge_Stateless_Test:test_isCorrectTokenPair_succeeds() (gas: 49936)
 StandardBridge_Stateless_Test:test_isOptimismMintableERC20_succeeds() (gas: 33072)
-Storage_Roundtrip_Test:test_setGetAddress_succeeds(bytes32,address) (runs: 64, μ: 31199, ~: 31821)
+Storage_Roundtrip_Test:test_setGetAddress_succeeds(bytes32,address) (runs: 64, μ: 31510, ~: 31821)
 Storage_Roundtrip_Test:test_setGetBytes32_succeeds(bytes32,bytes32) (runs: 64, μ: 31598, ~: 31598)
 Storage_Roundtrip_Test:test_setGetUint_succeeds(bytes32,uint256) (runs: 64, μ: 31042, ~: 31664)
 SystemConfig_Initialize_Test:test_initialize_events_succeeds() (gas: 71972)

packages/contracts-bedrock/semver-lock.json

@@ -20,7 +20,7 @@
   "src/L2/SequencerFeeVault.sol": "0xc2f733c1128d06ad60bf1e1d98c8f684a4825b11875ccdf2376ede33f5aad4e6",
   "src/dispute/BlockOracle.sol": "0x7e724b1ee0116dfd744f556e6237af449c2f40c6426d6f1462ae2a47589283bb",
   "src/dispute/DisputeGameFactory.sol": "0xfdfa141408d7f8de7e230ff4bef088e30d0e4d569ca743d60d292abdd21ff270",
-  "src/dispute/FaultDisputeGame.sol": "0x1f7d912e17f8bef2934cd3e5eee4f6a0e520e514c4ad6fdd7d1a8234494071d1",
+  "src/dispute/FaultDisputeGame.sol": "0x0766707ab32338a6586c2340ddfbfd4e9023eeb9dfa3ef87e4b404fb0260479f",
   "src/legacy/DeployerWhitelist.sol": "0x0a6840074734c9d167321d3299be18ef911a415e4c471fa92af7d6cfaa8336d4",
   "src/legacy/L1BlockNumber.sol": "0x20d83a636c5e2067fca8c0ed505b295174e6eddb25960d8705e6b6fea8e77fa6",
   "src/legacy/LegacyMessagePasser.sol": "0x80f355c9710af586f58cf6a86d1925e0073d1e504d0b3d814284af1bafe4dece",

packages/contracts-bedrock/src/cannon/PreimageKeyLib.sol

@@ -15,12 +15,13 @@ library PreimageKeyLib {
             // the [1, 32) bytes in this value.
             key_ := or(shl(248, 1), and(_ident, not(shl(248, 0xFF))))
         }
+        // Localize the key with the given local context.
         key_ = localize(key_, _localContext);
     }
 
     /// @notice Localizes a given local data key for the caller's context.
     /// @dev The localization operation is defined as:
-    ///      localize(k) = H(k .. sender) & ~(0xFF << 248) | (0x01 << 248)
+    ///      localize(k) = H(k .. sender .. local_context) & ~(0xFF << 248) | (0x01 << 248)
     ///      where H is the Keccak-256 hash function.
     /// @param _key The local data key to localize.
     /// @param _localContext The local context for the key.

packages/contracts-bedrock/src/dispute/FaultDisputeGame.sol

@@ -174,7 +174,7 @@ contract FaultDisputeGame is IFaultDisputeGame, Clone, ISemver {
         // SAFETY:    While the `attack` path does not need an extra check for the post
         //            state's depth in relation to the parent, we don't need another
         //            branch because (n - n) % 2 == 0.
-        // TODO(clabby): Once output bisection is implemented, the local context will no longer
+        // TODO(client-pod#94): Once output bisection is implemented, the local context will no longer
         //                      be constant. We will need to pass it in here based off of the ancestor
         //                      disputed output root's L2 block number.
         bool validStep = VM.step(_stateData, _proof, 0) == Claim.unwrap(postState.claim);