add EOF test case for t8n tool

tools/t8n/t8n_test.nim

@@ -403,7 +403,16 @@ const
       ),
       output: T8nOutput(alloc: true, result: true),
       expOut: "exp.json",
-    )
+    ),
+    TestSpec(
+      name: "Validate pre-allocated EOF code",
+      base: "testdata/26",
+      input: t8nInput(
+        "alloc.json", "txs.json", "env.json", "Cancun", "",
+      ),
+      output: T8nOutput(alloc: true, result: false),
+      expExitCode: 3,
+    ),
   ]
 
 proc main() =

tools/t8n/testdata/26/alloc.json

@@ -0,0 +1,14 @@
+{
+  "a94f5374fce5edbc8e2a8697c15331677e6ebf0b": {
+    "balance": "0x0",
+    "code": "0xef01",
+    "nonce": "0x1",
+    "storage": {}
+  },
+  "a94f5374fce5edbc8e2a8697c15331677e6ebf0c": {
+    "balance": "0x0",
+    "code": "0xef0001010008020002000700020300000000000002020100025959b0000250b101b1",
+    "nonce": "0x1",
+    "storage": {}
+  }
+}

tools/t8n/testdata/26/env.json

@@ -0,0 +1,11 @@
+{
+  "currentCoinbase": "0xc94f5374fce5edbc8e2a8697c15331677e6ebf0b",
+  "currentDifficulty": null,
+  "currentRandom": "0xdeadc0de",
+  "currentGasLimit": "0x750a163df65e8a",
+  "parentBaseFee": "0x500",
+  "parentGasUsed": "0x0",
+  "parentGasLimit": "0x750a163df65e8a",
+  "currentNumber": "1",
+  "currentTimestamp": "1000"
+}

tools/t8n/testdata/26/txs.json

@@ -0,0 +1 @@
+[]

tools/t8n/transition.nim

@@ -11,18 +11,18 @@
 import
   std/[json, strutils, times, tables, os, sets],
   eth/[rlp, trie, eip1559],
-  stint, chronicles, stew/results,
+  stint, chronicles, stew/[results, byteutils],
   "."/[config, types, helpers],
   ../common/state_clearing,
   ../../nimbus/[vm_types, vm_state, transaction],
   ../../nimbus/common/common,
   ../../nimbus/db/accounts_cache,
-  ../../nimbus/utils/utils,
+  ../../nimbus/evm/validate,
+  ../../nimbus/utils/[utils, eof],
   ../../nimbus/core/pow/difficulty,
   ../../nimbus/core/dao,
   ../../nimbus/core/executor/[process_transaction, executor_helpers]
 
-import stew/byteutils
 const
   wrapExceptionEnabled* {.booldefine.} = true
   stdinSelector = "stdin"
@@ -372,6 +372,21 @@ proc transitionAction*(ctx: var TransContext, conf: T8NConf) =
       else:
         raise newError(ErrorConfig, "EIP-1559 config but missing 'currentBaseFee' in env section")
 
+    # Sanity check pre-allocated EOF code to not panic in state transition.
+    if com.forkGTE(HardFork.Cancun):
+      for address, acc in ctx.alloc:
+        if not hasEOFByte(acc.code):
+          continue
+
+        var c: Container
+        var res = c.decode(acc.code)
+        if res.isOk:
+          res = c.validateCode()
+
+        if res.isErr:
+          raise newError(ErrorConfig, "code at $1 considered invalid: $2" %
+            [address.toHex, res.error.toString])
+
     if com.forkGTE(MergeFork):
       if ctx.env.currentRandom.isNone:
         raise newError(ErrorConfig, "post-merge requires currentRandom to be defined in env")