From 78745551c077bf54151202138c2629f288769561 Mon Sep 17 00:00:00 2001
From: Determinant <tederminant@gmail.com>
Date: Tue, 15 Sep 2020 23:55:34 -0400
Subject: WIP: geth-tavum

---
 core/vm/eips.go | 82 ++++++++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 63 insertions(+), 19 deletions(-)

(limited to 'core/vm/eips.go')

diff --git a/core/vm/eips.go b/core/vm/eips.go
index 75e5fb1..5ec7587 100644
--- a/core/vm/eips.go
+++ b/core/vm/eips.go
@@ -18,27 +18,44 @@ package vm
 
 import (
 	"fmt"
+	"sort"
 
 	"github.com/ava-labs/coreth/params"
+	"github.com/holiman/uint256"
 )
 
+var activators = map[int]func(*JumpTable){
+	2200: enable2200,
+	1884: enable1884,
+	1344: enable1344,
+	2315: enable2315,
+}
+
 // EnableEIP enables the given EIP on the config.
 // This operation writes in-place, and callers need to ensure that the globally
 // defined jump tables are not polluted.
 func EnableEIP(eipNum int, jt *JumpTable) error {
-	switch eipNum {
-	case 2200:
-		enable2200(jt)
-	case 1884:
-		enable1884(jt)
-	case 1344:
-		enable1344(jt)
-	default:
+	enablerFn, ok := activators[eipNum]
+	if !ok {
 		return fmt.Errorf("undefined eip %d", eipNum)
 	}
+	enablerFn(jt)
 	return nil
 }
 
+func ValidEip(eipNum int) bool {
+	_, ok := activators[eipNum]
+	return ok
+}
+func ActivateableEips() []string {
+	var nums []string
+	for k := range activators {
+		nums = append(nums, fmt.Sprintf("%d", k))
+	}
+	sort.Strings(nums)
+	return nums
+}
+
 // enable1884 applies EIP-1884 to the given jump table:
 // - Increase cost of BALANCE to 700
 // - Increase cost of EXTCODEHASH to 700
@@ -46,23 +63,22 @@ func EnableEIP(eipNum int, jt *JumpTable) error {
 // - Define SELFBALANCE, with cost GasFastStep (5)
 func enable1884(jt *JumpTable) {
 	// Gas cost changes
+	jt[SLOAD].constantGas = params.SloadGasEIP1884
 	jt[BALANCE].constantGas = params.BalanceGasEIP1884
 	jt[EXTCODEHASH].constantGas = params.ExtcodeHashGasEIP1884
-	jt[SLOAD].constantGas = params.SloadGasEIP1884
 
 	// New opcode
-	jt[SELFBALANCE] = operation{
+	jt[SELFBALANCE] = &operation{
 		execute:     opSelfBalance,
 		constantGas: GasFastStep,
 		minStack:    minStack(0, 1),
 		maxStack:    maxStack(0, 1),
-		valid:       true,
 	}
 }
 
-func opSelfBalance(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
-	balance := interpreter.intPool.get().Set(interpreter.evm.StateDB.GetBalance(contract.Address()))
-	stack.push(balance)
+func opSelfBalance(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx) ([]byte, error) {
+	balance, _ := uint256.FromBig(interpreter.evm.StateDB.GetBalance(callContext.contract.Address()))
+	callContext.stack.push(balance)
 	return nil, nil
 }
 
@@ -70,23 +86,51 @@ func opSelfBalance(pc *uint64, interpreter *EVMInterpreter, contract *Contract,
 // - Adds an opcode that returns the current chain’s EIP-155 unique identifier
 func enable1344(jt *JumpTable) {
 	// New opcode
-	jt[CHAINID] = operation{
+	jt[CHAINID] = &operation{
 		execute:     opChainID,
 		constantGas: GasQuickStep,
 		minStack:    minStack(0, 1),
 		maxStack:    maxStack(0, 1),
-		valid:       true,
 	}
 }
 
 // opChainID implements CHAINID opcode
-func opChainID(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
-	chainId := interpreter.intPool.get().Set(interpreter.evm.chainConfig.ChainID)
-	stack.push(chainId)
+func opChainID(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx) ([]byte, error) {
+	chainId, _ := uint256.FromBig(interpreter.evm.chainConfig.ChainID)
+	callContext.stack.push(chainId)
 	return nil, nil
 }
 
 // enable2200 applies EIP-2200 (Rebalance net-metered SSTORE)
 func enable2200(jt *JumpTable) {
+	jt[SLOAD].constantGas = params.SloadGasEIP2200
 	jt[SSTORE].dynamicGas = gasSStoreEIP2200
 }
+
+// enable2315 applies EIP-2315 (Simple Subroutines)
+// - Adds opcodes that jump to and return from subroutines
+func enable2315(jt *JumpTable) {
+	// New opcode
+	jt[BEGINSUB] = &operation{
+		execute:     opBeginSub,
+		constantGas: GasQuickStep,
+		minStack:    minStack(0, 0),
+		maxStack:    maxStack(0, 0),
+	}
+	// New opcode
+	jt[JUMPSUB] = &operation{
+		execute:     opJumpSub,
+		constantGas: GasSlowStep,
+		minStack:    minStack(1, 0),
+		maxStack:    maxStack(1, 0),
+		jumps:       true,
+	}
+	// New opcode
+	jt[RETURNSUB] = &operation{
+		execute:     opReturnSub,
+		constantGas: GasFastStep,
+		minStack:    minStack(0, 0),
+		maxStack:    maxStack(0, 0),
+		jumps:       true,
+	}
+}
-- 
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