From bd89dda25c821c5dedf62907371f1ca39fae049a Mon Sep 17 00:00:00 2001
From: jeffreylin0723 <qwertzxc1478963@gmail.com>
Date: Tue, 8 Aug 2023 01:08:02 +0800
Subject: [PATCH 1/4] add opcode opInferCall signature

---
 core/vm/instructions.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/core/vm/instructions.go b/core/vm/instructions.go
index 2105201fce42..59027b78b111 100644
--- a/core/vm/instructions.go
+++ b/core/vm/instructions.go
@@ -845,6 +845,11 @@ func opSelfdestruct6780(pc *uint64, interpreter *EVMInterpreter, scope *ScopeCon
 	return nil, errStopToken
 }
 
+func opInferCall(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]byte, error) {
+	ret := 5
+	return []byte{byte(ret)}, nil
+}
+
 // following functions are used by the instruction jump  table
 
 // make log instruction function

From e5e5e04a6cbc890cf100f0c57ac0e39064eeb84b Mon Sep 17 00:00:00 2001
From: jeffreylin0723 <qwertzxc1478963@gmail.com>
Date: Tue, 8 Aug 2023 01:31:59 +0800
Subject: [PATCH 2/4] add opcode to be 0xb0

---
 core/vm/opcodes.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/core/vm/opcodes.go b/core/vm/opcodes.go
index 2929b8ce920c..cb4cad51da92 100644
--- a/core/vm/opcodes.go
+++ b/core/vm/opcodes.go
@@ -208,6 +208,11 @@ const (
 	LOG4
 )
 
+// 0xb0 range - infercall ops
+const (
+	INFERCALL OpCode = 0xb0
+)
+
 // 0xf0 range - closures.
 const (
 	CREATE       OpCode = 0xf0

From af5bec11e2c8d324b3955c6cf341365ff40ec53b Mon Sep 17 00:00:00 2001
From: jeffreylin0723 <qwertzxc1478963@gmail.com>
Date: Tue, 8 Aug 2023 01:32:47 +0800
Subject: [PATCH 3/4] add jump table with dynamic gas and min&max stack same
 with CALL

---
 core/vm/jump_table.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/core/vm/jump_table.go b/core/vm/jump_table.go
index 702b18661545..495912d13351 100644
--- a/core/vm/jump_table.go
+++ b/core/vm/jump_table.go
@@ -216,6 +216,7 @@ func newByzantiumInstructionSet() JumpTable {
 func newSpuriousDragonInstructionSet() JumpTable {
 	instructionSet := newTangerineWhistleInstructionSet()
 	instructionSet[EXP].dynamicGas = gasExpEIP158
+
 	return validate(instructionSet)
 }
 
@@ -1051,6 +1052,13 @@ func newFrontierInstructionSet() JumpTable {
 			minStack:   minStack(1, 0),
 			maxStack:   maxStack(1, 0),
 		},
+		// make infercall min max stack equal to call for now.
+		INFERCALL: {
+			execute:    opInferCall,
+			dynamicGas: gasInferCall,
+			minStack:   minStack(7, 1),
+			maxStack:   maxStack(7, 1),
+		},
 	}
 
 	// Fill all unassigned slots with opUndefined.

From d95ea841329173ac3ca087c4e5daff50a9545149 Mon Sep 17 00:00:00 2001
From: jeffreylin0723 <qwertzxc1478963@gmail.com>
Date: Tue, 8 Aug 2023 01:33:10 +0800
Subject: [PATCH 4/4] add dynamic gas function

---
 core/vm/gas_table.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/core/vm/gas_table.go b/core/vm/gas_table.go
index 5153c8b7a3de..d171cbaa7ecc 100644
--- a/core/vm/gas_table.go
+++ b/core/vm/gas_table.go
@@ -477,3 +477,10 @@ func gasSelfdestruct(evm *EVM, contract *Contract, stack *Stack, mem *Memory, me
 	}
 	return gas, nil
 }
+
+// add gas function for inferCall
+func gasInferCall(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
+	//return constant gas
+	var gas uint64 = 20
+	return gas, nil
+}