cmd/evm: make evm t8n handle post-merge transitions (ethereum#24546)

This adds the ability to run --state.fork=Merged, and have post-merge rules apply. When doing so, it also requires the input env to contain currentRandom, and enforces the currentDifficulty to be omitted or zero.

cmd/evm/internal/t8ntool/flags.go

@@ -152,7 +152,7 @@ var (
 			"\n\tSyntax <forkname>(+ExtraEip)",
 			strings.Join(tests.AvailableForks(), "\n\t    "),
 			strings.Join(vm.ActivateableEips(), ", ")),
-		Value: "Istanbul",
+		Value: "ArrowGlacier",
 	}
 	VerbosityFlag = cli.IntFlag{
 		Name:  "verbosity",

cmd/evm/internal/t8ntool/transition.go

@@ -252,11 +252,21 @@ func Transition(ctx *cli.Context) error {
 			return NewError(ErrorConfig, errors.New("EIP-1559 config but missing 'currentBaseFee' in env section"))
 		}
 	}
-	// Sanity check, to not `panic` in state_transition
-	if prestate.Env.Random != nil && !chainConfig.IsLondon(big.NewInt(int64(prestate.Env.Number))) {
-		return NewError(ErrorConfig, errors.New("can only apply RANDOM on top of London chainrules"))
-	}
-	if env := prestate.Env; env.Difficulty == nil {
+	isMerged := chainConfig.TerminalTotalDifficulty != nil && chainConfig.TerminalTotalDifficulty.BitLen() == 0
+	env := prestate.Env
+	if isMerged {
+		// post-merge:
+		// - random must be supplied
+		// - difficulty must be zero
+		switch {
+		case env.Random == nil:
+			return NewError(ErrorConfig, errors.New("post-merge requires currentRandom to be defined in env"))
+		case env.Difficulty != nil && env.Difficulty.BitLen() != 0:
+			return NewError(ErrorConfig, errors.New("post-merge difficulty must be zero (or omitted) in env"))
+		}
+		prestate.Env.Difficulty = nil
+	} else if env.Difficulty == nil {
+		// pre-merge:
 		// If difficulty was not provided by caller, we need to calculate it.
 		switch {
 		case env.ParentDifficulty == nil:

cmd/evm/t8n_test.go

@@ -203,6 +203,22 @@ func TestT8n(t *testing.T) {
 			output: t8nOutput{result: true},
 			expOut: "exp.json",
 		},
+		{ // Test post-merge transition
+			base: "./testdata/24",
+			input: t8nInput{
+				"alloc.json", "txs.json", "env.json", "Merged", "",
+			},
+			output: t8nOutput{alloc: true, result: true},
+			expOut: "exp.json",
+		},
+		{ // Test post-merge transition where input is missing random
+			base: "./testdata/24",
+			input: t8nInput{
+				"alloc.json", "txs.json", "env-missingrandom.json", "Merged", "",
+			},
+			output:      t8nOutput{alloc: false, result: false},
+			expExitCode: 3,
+		},
 	} {
 
 		args := []string{"t8n"}

cmd/evm/testdata/24/alloc.json

@@ -0,0 +1,14 @@
+{
+  "a94f5374fce5edbc8e2a8697c15331677e6ebf0b": {
+    "balance": "0x5ffd4878be161d74",
+    "code": "0x",
+    "nonce": "0xac",
+    "storage": {}
+  },
+  "0x8a8eafb1cf62bfbeb1741769dae1a9dd47996192":{
+    "balance": "0xfeedbead",
+    "nonce" : "0x00",
+    "code" : "0x44600055",
+    "_comment": "The code is 'sstore(0, random)'"
+  }
+}

cmd/evm/testdata/24/env-missingrandom.json

@@ -0,0 +1,9 @@
+{
+  "currentCoinbase": "0xc94f5374fce5edbc8e2a8697c15331677e6ebf0b",
+  "currentDifficulty": null,
+  "currentRandom": null,
+  "currentGasLimit": "0x750a163df65e8a",
+  "currentBaseFee": "0x500",
+  "currentNumber": "1",
+  "currentTimestamp": "1000"
+}

cmd/evm/testdata/24/env.json

@@ -0,0 +1,9 @@
+{
+  "currentCoinbase": "0xc94f5374fce5edbc8e2a8697c15331677e6ebf0b",
+  "currentDifficulty": null,
+  "currentRandom": "0xdeadc0de",
+  "currentGasLimit": "0x750a163df65e8a",
+  "currentBaseFee": "0x500",
+  "currentNumber": "1",
+  "currentTimestamp": "1000"
+}

cmd/evm/testdata/24/exp.json

@@ -0,0 +1,53 @@
+{
+  "alloc": {
+    "0x8a8eafb1cf62bfbeb1741769dae1a9dd47996192": {
+      "code": "0x44600055",
+      "storage": {
+        "0x0000000000000000000000000000000000000000000000000000000000000000": "0x00000000000000000000000000000000000000000000000000000000deadc0de"
+      },
+      "balance": "0xfeedbeaf"
+    },
+    "0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b": {
+      "balance": "0x5ffd4878b803f972",
+      "nonce": "0xae"
+    },
+    "0xc94f5374fce5edbc8e2a8697c15331677e6ebf0b": {
+      "balance": "0x1030600"
+    }
+  },
+  "result": {
+    "stateRoot": "0x9e4224c6bba343d5b0fdbe9200cc66a7ef2068240d901ae516e634c45a043c15",
+    "txRoot": "0x16cd3a7daa6686ceebadf53b7af2bc6919eccb730907f0e74a95a4423c209593",
+    "receiptsRoot": "0x22b85cda738345a9880260b2a71e144aab1ca9485f5db4fd251008350fc124c8",
+    "logsHash": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
+    "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+    "receipts": [
+      {
+        "root": "0x",
+        "status": "0x1",
+        "cumulativeGasUsed": "0xa861",
+        "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+        "logs": null,
+        "transactionHash": "0x92ea4a28224d033afb20e0cc2b290d4c7c2d61f6a4800a680e4e19ac962ee941",
+        "contractAddress": "0x0000000000000000000000000000000000000000",
+        "gasUsed": "0xa861",
+        "blockHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
+        "transactionIndex": "0x0"
+      },
+      {
+        "root": "0x",
+        "status": "0x1",
+        "cumulativeGasUsed": "0x10306",
+        "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+        "logs": null,
+        "transactionHash": "0x16b1d912f1d664f3f60f4e1b5f296f3c82a64a1a253117b4851d18bc03c4f1da",
+        "contractAddress": "0x0000000000000000000000000000000000000000",
+        "gasUsed": "0x5aa5",
+        "blockHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
+        "transactionIndex": "0x1"
+      }
+    ],
+    "currentDifficulty": null,
+    "gasUsed": "0x10306"
+  }
+}

cmd/evm/testdata/24/txs.json

@@ -0,0 +1,28 @@
+[
+  {
+    "gas": "0x186a0",
+    "gasPrice": "0x600",
+    "hash": "0x0557bacce3375c98d806609b8d5043072f0b6a8bae45ae5a67a00d3a1a18d673",
+    "input": "0x",
+    "nonce": "0xac",
+    "to": "0x8a8eafb1cf62bfbeb1741769dae1a9dd47996192",
+    "value": "0x1",
+    "v" : "0x0",
+    "r" : "0x0",
+    "s" : "0x0",
+    "secretKey" : "0x45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8"
+  },
+  {
+    "gas": "0x186a0",
+    "gasPrice": "0x600",
+    "hash": "0x0557bacce3375c98d806609b8d5043072f0b6a8bae45ae5a67a00d3a1a18d673",
+    "input": "0x",
+    "nonce": "0xad",
+    "to": "0x8a8eafb1cf62bfbeb1741769dae1a9dd47996192",
+    "value": "0x1",
+    "v" : "0x0",
+    "r" : "0x0",
+    "s" : "0x0",
+    "secretKey" : "0x45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8"
+  }
+]

tests/init.go

@@ -197,6 +197,23 @@ var Forks = map[string]*params.ChainConfig{
 		LondonBlock:         big.NewInt(0),
 		ArrowGlacierBlock:   big.NewInt(0),
 	},
+	"Merged": {
+		ChainID:                 big.NewInt(1),
+		HomesteadBlock:          big.NewInt(0),
+		EIP150Block:             big.NewInt(0),
+		EIP155Block:             big.NewInt(0),
+		EIP158Block:             big.NewInt(0),
+		ByzantiumBlock:          big.NewInt(0),
+		ConstantinopleBlock:     big.NewInt(0),
+		PetersburgBlock:         big.NewInt(0),
+		IstanbulBlock:           big.NewInt(0),
+		MuirGlacierBlock:        big.NewInt(0),
+		BerlinBlock:             big.NewInt(0),
+		LondonBlock:             big.NewInt(0),
+		ArrowGlacierBlock:       big.NewInt(0),
+		MergeForkBlock:          big.NewInt(0),
+		TerminalTotalDifficulty: big.NewInt(0),
+	},
 }
 
 // Returns the set of defined fork names