From ba2b9c8a1bb1876b6eb4c9783fde798b19de4418 Mon Sep 17 00:00:00 2001
From: stefan <stefan@s00.xyz>
Date: Wed, 24 May 2023 08:32:08 -0400
Subject: init

---
 vm/vm.go | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 vm/vm.go

(limited to 'vm/vm.go')

diff --git a/vm/vm.go b/vm/vm.go
new file mode 100644
index 0000000..209ab71
--- /dev/null
+++ b/vm/vm.go
@@ -0,0 +1,45 @@
+package main
+
+import (
+	"fmt"
+	"github.com/holiman/uint256"
+)
+
+type Evm struct {
+	code Rom
+	stack Stack
+	memory Memory
+	pc uint64
+	stopped bool
+}
+
+func NewEvm(_code []byte) *Evm {
+	return &Evm{
+		pc: 0,
+		stopped: true,
+		stack : Stack{},
+		code: _code,
+	}
+}
+
+func (vm *Evm) Start() {
+	vm.stopped = false
+	for !(vm.stopped) {
+		op := vm.code.Fetch(&(vm.pc), 1)[0] 
+		fmt.Printf("pc: %d | opcode: %x -> string: %s\n", vm.pc, op, Instructions[op].name)
+		if op >= PUSH1 && op <= PUSH32 {
+			nb := op - PUSH1 + 1
+			fmt.Printf("pushing %d byte value to the stack!\n", vm.pc, nb)
+			b := vm.code.Fetch(&(vm.pc), uint64(nb))
+		        x := uint256.NewInt(0)
+			x = x.SetBytes(b)
+			vm.stack.Push(x)
+		} else {
+			vm.Execute(op)
+		}
+	}
+}
+
+func (vm *Evm) Execute(op byte) { 
+	Instructions[op].handler(vm)
+}
-- 
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