From e2fa55a48f352e8fdb3ec84aa80e6f49baeb7878 Mon Sep 17 00:00:00 2001
From: Andrei Maiboroda <andrei@ethereum.org>
Date: Mon, 29 Nov 2021 13:18:27 +0100
Subject: [PATCH] core/vm: Define an operation for INVALID(0xfe)

It is required to distinguish INVALID in the jump table from undefined opcodes.
---
 core/vm/instructions.go | 4 ++++
 core/vm/jump_table.go   | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/core/vm/instructions.go b/core/vm/instructions.go
index cb31970454d9..3de9d51dbc4f 100644
--- a/core/vm/instructions.go
+++ b/core/vm/instructions.go
@@ -819,6 +819,10 @@ func opStop(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]byt
 	return nil, errStopToken
 }
 
+func opInvalid(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]byte, error) {
+	return nil, &ErrInvalidOpCode{opcode: INVALID}
+}
+
 func opSelfdestruct(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]byte, error) {
 	if interpreter.readOnly {
 		return nil, ErrWriteProtection
diff --git a/core/vm/jump_table.go b/core/vm/jump_table.go
index 25024c17aef9..5e55f18e2d0d 100644
--- a/core/vm/jump_table.go
+++ b/core/vm/jump_table.go
@@ -1028,6 +1028,12 @@ func newFrontierInstructionSet() JumpTable {
 			maxStack:   maxStack(2, 0),
 			memorySize: memoryReturn,
 		},
+		INVALID: {
+			execute:     opInvalid,
+			constantGas: 0,
+			minStack:    minStack(0, 0),
+			maxStack:    maxStack(0, 0),
+		},
 		SELFDESTRUCT: {
 			execute:    opSelfdestruct,
 			dynamicGas: gasSelfdestruct,