Add constructor to `MIPS.sol`

packages/contracts-bedrock/scripts/Deploy.s.sol

@@ -32,6 +32,7 @@ import { Predeploys } from "src/libraries/Predeploys.sol";
 import { Chains } from "./Chains.sol";
 
 import { IBigStepper } from "src/dispute/interfaces/IBigStepper.sol";
+import { IPreimageOracle } from "src/cannon/interfaces/IPreimageOracle.sol";
 import { AlphabetVM } from "../test/FaultDisputeGame.t.sol";
 import "src/libraries/DisputeTypes.sol";
 
@@ -386,7 +387,7 @@ contract Deploy is Deployer {
 
     /// @notice Deploy Mips
     function deployMips() onlyDevnet broadcast() public returns (address) {
-        MIPS mips = new MIPS();
+        MIPS mips = new MIPS(IPreimageOracle(mustGetAddress("PreimageOracle")));
         save("Mips", address(mips));
         console.log("MIPS deployed at %s", address(mips));
 

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

@@ -53,9 +53,14 @@ contract MIPS {
     uint32 constant EBADF = 0x9;
     uint32 constant EINVAL = 0x16;
 
-    /// @notice The pre-image oracle.
+    /// @notice The preimage oracle contract.
     IPreimageOracle public oracle;
 
+    /// @param _oracle The address of the preimage oracle contract.
+    constructor(IPreimageOracle _oracle) {
+        oracle = _oracle;
+    }
+
     /// @notice Extends the value leftwards with its most significant bit (sign extension).
     function SE(uint32 _dat, uint32 _idx) internal pure returns (uint32) {
         unchecked {

packages/contracts-bedrock/test/MIPS.t.sol

@@ -11,7 +11,7 @@ contract MIPS_Test is Test {
 
     function setUp() public {
         oracle = new PreimageOracle();
-        mips = new MIPS();
+        mips = new MIPS(oracle);
         vm.store(address(mips), 0x0, bytes32(abi.encode(address(oracle))));
         vm.label(address(oracle), "PreimageOracle");
         vm.label(address(mips), "MIPS");