cmd/evm: Add --vm.evm flag to support EVMC (#18457)

cmd/evm/main.go

@@ -110,6 +110,11 @@ var (
 		Name:  "nostack",
 		Usage: "disable stack output",
 	}
+	EVMInterpreterFlag = cli.StringFlag{
+		Name:  "vm.evm",
+		Usage: "External EVM configuration (default = built-in interpreter)",
+		Value: "",
+	}
 )
 
 func init() {
@@ -133,6 +138,7 @@ func init() {
 		ReceiverFlag,
 		DisableMemoryFlag,
 		DisableStackFlag,
+		EVMInterpreterFlag,
 	}
 	app.Commands = []cli.Command{
 		compileCommand,

cmd/evm/runner.go

@@ -171,8 +171,9 @@ func runCmd(ctx *cli.Context) error {
 		Coinbase:    genesisConfig.Coinbase,
 		BlockNumber: new(big.Int).SetUint64(genesisConfig.Number),
 		EVMConfig: vm.Config{
-			Tracer: tracer,
-			Debug:  ctx.GlobalBool(DebugFlag.Name) || ctx.GlobalBool(MachineFlag.Name),
+			Tracer:         tracer,
+			Debug:          ctx.GlobalBool(DebugFlag.Name) || ctx.GlobalBool(MachineFlag.Name),
+			EVMInterpreter: ctx.GlobalString(EVMInterpreterFlag.Name),
 		},
 	}