Ensure TransientStorage cleanups after Tx-level contract creation (#3625)

* evm: fix bug not clearing transient storage on tx-level create

* evm: add tests for tstore cleanup

* make cspell happy

---------

Co-authored-by: acolytec3 <[email protected]>

Author: 2 people

packages/evm/src/evm.ts

@@ -733,6 +733,10 @@ export class EVM implements EVMInterface {
       }
     }
 
+    if (message.depth === 0) {
+      this.postMessageCleanup()
+    }
+
     return {
       createdAddress: message.to,
       execResult: result,

packages/evm/test/transientStorage.spec.ts

@@ -1,6 +1,7 @@
-import { Address } from '@ethereumjs/util'
+import { Address, equalsBytes, hexToBytes, setLengthLeft, unpadBytes } from '@ethereumjs/util'
 import { assert, describe, it } from 'vitest'
 
+import { EVM } from '../src/index.js'
 import { TransientStorage } from '../src/transientStorage.js'
 
 describe('Transient Storage', () => {
@@ -176,4 +177,38 @@ describe('Transient Storage', () => {
     transientStorage.revert()
     assert.deepEqual(transientStorage.get(address, key), value1)
   })
+
+  it('should cleanup after a message create', async () => {
+    const evm = await EVM.create()
+    // PUSH 1 PUSH 1 TSTORE
+    const code = hexToBytes('0x600160015D')
+    const keyBuf = setLengthLeft(new Uint8Array([1]), 32)
+    const result = await evm.runCall({
+      data: code,
+      gasLimit: BigInt(100_000),
+    })
+    const created = result.createdAddress!
+    const stored = evm.transientStorage.get(created, keyBuf)
+    assert.ok(
+      equalsBytes(unpadBytes(stored), new Uint8Array()),
+      'Transient storage has been cleared'
+    )
+  })
+
+  it('should cleanup after a message call', async () => {
+    const evm = await EVM.create()
+    const contractAddress = Address.zero()
+    // PUSH 1 PUSH 1 TSTORE
+    const code = hexToBytes('0x600160015D')
+    await evm.stateManager.putContractCode(contractAddress, code)
+    const keyBuf = setLengthLeft(new Uint8Array([1]), 32)
+    await evm.runCall({
+      gasLimit: BigInt(100_000),
+    })
+    const stored = evm.transientStorage.get(contractAddress, keyBuf)
+    assert.ok(
+      equalsBytes(unpadBytes(stored), new Uint8Array()),
+      'Transient storage has been cleared'
+    )
+  })
 })