From 4190465c531005f9423b4ac936f6cd3ba81d1585 Mon Sep 17 00:00:00 2001
From: Daniel Liu <liudaniel@qq.com>
Date: Wed, 5 Feb 2025 13:12:36 +0800
Subject: [PATCH] core/vm: expose jumptable constructors (#26880)

---
 core/vm/jump_table_export.go | 74 ++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 core/vm/jump_table_export.go

diff --git a/core/vm/jump_table_export.go b/core/vm/jump_table_export.go
new file mode 100644
index 0000000000..60a1340985
--- /dev/null
+++ b/core/vm/jump_table_export.go
@@ -0,0 +1,74 @@
+// Copyright 2023 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package vm
+
+import (
+	"errors"
+
+	"github.com/XinFinOrg/XDPoSChain/params"
+)
+
+// LookupInstructionSet returns the instructionset for the fork configured by
+// the rules.
+func LookupInstructionSet(rules params.Rules) (JumpTable, error) {
+	switch {
+	case rules.IsCancun:
+		return newEip1559InstructionSet(), errors.New("cancun-fork not defined yet")
+	case rules.IsEIP1559:
+		return newEip1559InstructionSet(), nil
+	case rules.IsShanghai:
+		return newShanghaiInstructionSet(), nil
+	case rules.IsMerge:
+		return newMergeInstructionSet(), nil
+	case rules.IsLondon:
+		return newLondonInstructionSet(), nil
+	case rules.IsBerlin:
+		return newBerlinInstructionSet(), nil
+	case rules.IsIstanbul:
+		return newIstanbulInstructionSet(), nil
+	case rules.IsConstantinople:
+		return newConstantinopleInstructionSet(), nil
+	case rules.IsByzantium:
+		return newByzantiumInstructionSet(), nil
+	case rules.IsEIP158:
+		return newSpuriousDragonInstructionSet(), nil
+	case rules.IsEIP150:
+		return newTangerineWhistleInstructionSet(), nil
+	case rules.IsHomestead:
+		return newHomesteadInstructionSet(), nil
+	}
+	return newFrontierInstructionSet(), nil
+}
+
+// Stack returns the mininum and maximum stack requirements.
+func (op *operation) Stack() (int, int) {
+	return op.minStack, op.maxStack
+}
+
+// HasCost returns true if the opcode has a cost. Opcodes which do _not_ have
+// a cost assigned are one of two things:
+// - undefined, a.k.a invalid opcodes,
+// - the STOP opcode.
+// This method can thus be used to check if an opcode is "Invalid (or STOP)".
+func (op *operation) HasCost() bool {
+	// Ideally, we'd check this:
+	//	return op.execute == opUndefined
+	// However, go-lang does now allow that. So we'll just check some other
+	// 'indicators' that this is an invalid op. Alas, STOP is impossible to
+	// filter out
+	return op.dynamicGas != nil || op.constantGas != 0
+}