From 20621e073562ee5d423b636fae8b6aa8e38275fa Mon Sep 17 00:00:00 2001
From: stefan <stefan@s00.xyz>
Date: Wed, 24 May 2023 22:29:46 -0400
Subject: readme and cleanup

---
 vm/instructions.go | 162 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 161 insertions(+), 1 deletion(-)

(limited to 'vm/instructions.go')

diff --git a/vm/instructions.go b/vm/instructions.go
index 5a1220b..8b8b2e2 100644
--- a/vm/instructions.go
+++ b/vm/instructions.go
@@ -1,3 +1,163 @@
 package main
 
-type InstructionHandler func (vm *Evm)
+import (
+	 "github.com/holiman/uint256"
+)
+
+type Handler func(vm *Evm)
+
+type Instruction struct {
+	name string
+	n    int // number of params
+	handler Handler  
+}
+
+type Inst Instruction // shorthand
+
+// i miss c macros :(
+var Instructions = [256]Instruction{
+	STOP: {
+        	name: "STOP",
+		n: 0,
+		handler: func(vm *Evm) { vm.stopped = true },
+	} ,
+	ADD: {
+		name: "ADD", 
+		n: 2, 
+		handler: func(vm *Evm) { 
+			o := uint256.NewInt(0)
+			vm.stack.Push(o.Add(vm.stack.Pop(), vm.stack.Pop()))
+		},
+	},
+	MUL: {
+		n: 2, 
+		name: "MUL",
+		handler: func(vm *Evm) {
+			o := uint256.NewInt(0)
+			vm.stack.Push(o.Mul(vm.stack.Pop(), vm.stack.Pop())) 
+		},
+	},
+	SUB: {
+		n: 2, 
+		name: "SUB",
+		handler: func(vm *Evm) {
+			o := uint256.NewInt(0)
+			vm.stack.Push(o.Sub(vm.stack.Pop(), vm.stack.Pop()))
+		},
+	},
+	DIV: {
+		n: 2, 
+		name: "DIV",
+		handler: func(vm *Evm) { 
+			o := uint256.NewInt(0)
+			vm.stack.Push(o.Div(vm.stack.Pop(), vm.stack.Pop()))
+		},	
+	},
+	SDIV: { 
+		n: 2, 
+		name: "SDIV", 
+		handler: func(vm *Evm) {
+			o := uint256.NewInt(0)
+			vm.stack.Push(o.SDiv(vm.stack.Pop(), vm.stack.Pop())) 
+		},
+	},
+	MOD: {
+		n: 2, 
+		name: "MOD",
+		handler: func(vm *Evm) { 
+			o := uint256.NewInt(0)
+			vm.stack.Push(o.Mod(vm.stack.Pop(), vm.stack.Pop())) 
+		},
+	},
+	SMOD: {
+		n: 2, 
+		name: "SMOD", 
+		handler: func(vm *Evm) { 
+			o := uint256.NewInt(0)
+			vm.stack.Push(o.SMod(vm.stack.Pop(), vm.stack.Pop())) 
+		},
+	},
+	ADDMOD: { 
+		n: 3, 
+		name: "ADDMOD",
+		handler: func(vm *Evm) { 
+			o := uint256.NewInt(0)
+			vm.stack.Push(o.AddMod(vm.stack.Pop(), vm.stack.Pop(), vm.stack.Pop())) 
+		},
+	},
+	MULMOD: {
+		n: 3, 
+		name: "MULMOD", 
+		handler: func(vm *Evm) {
+			o := uint256.NewInt(0)
+			vm.stack.Push(o.MulMod(vm.stack.Pop(), vm.stack.Pop(), vm.stack.Pop()))
+		},
+	},
+	POP: { 
+		n: 1, 
+		name: "POP", 
+		handler: func(vm *Evm) { 
+			vm.stack.Pop() 
+		},
+	}, 
+	MLOAD: { 
+		n: 1, 
+		name: "MLOAD",
+	},
+	MSTORE: {
+		n: 2, 
+		name: "MSTORE", 
+		handler: func(vm *Evm) {
+			vm.memory.sw(vm.stack.Pop().Uint64(), vm.stack.Pop())
+		},
+	},
+	MSTORE8: { 
+		n: 2, 
+		name: "MSTORE8",
+		handler: func(vm *Evm) {
+			ost := vm.stack.Pop().Uint64()
+			x := vm.stack.Pop().Bytes()
+			n := x[len(x)-1]
+			vm.memory.sb(ost, n)
+		},
+	},
+	PUSH1:  { name: "PUSH1" },
+	PUSH2:  { name: "PUSH2" },
+	PUSH3:  { name: "PUSH3" },
+	PUSH4:  { name: "PUSH4" },
+	PUSH5:  { name: "PUSH5" },
+	PUSH6:  { name: "PUSH6" },
+	PUSH7:  { name: "PUSH7" },
+	PUSH8:  { name: "PUSH8" },
+	PUSH9:  { name: "PUSH9" },
+	PUSH10: { name: "PUSH0" },
+	PUSH11: { name: "PUSH11" },
+	PUSH12: { name: "PUSH12" },
+	PUSH13: { name: "PUSH13" },
+	PUSH14: { name: "PUSH14" },
+	PUSH15: { name: "PUSH15" },
+	PUSH16: { name: "PUSH16" },
+	PUSH17: { name: "PUSH17" },
+	PUSH18: { name: "PUSH18" },
+	PUSH19: { name: "PUSH19" },
+	PUSH20: { name: "PUSH20" },
+	PUSH21: { name: "PUSH21" },
+	PUSH22: { name: "PUSH22" },
+	PUSH23: { name: "PUSH23" },
+	PUSH24: { name: "PUSH24" },
+	PUSH25: { name: "PUSH25" },
+	PUSH26: { name: "PUSH26" },
+	PUSH27: { name: "PUSH27" },
+	PUSH28: { name: "PUSH28" },
+	PUSH29: { name: "PUSH29" },
+	PUSH30: { name: "PUSH30" },
+	PUSH31: { name: "PUSH31" },
+	PUSH32: { name: "PUSH32" },
+	RETURN: { 
+		n: 2, 
+		name: "RETURN",
+		handler: func(vm *Evm) {
+			vm.returndata = vm.memory.ld(vm.stack.Pop().Uint64(), vm.stack.Pop().Uint64())
+		},
+	},
+}
-- 
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