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package main
import (
"fmt"
"github.com/holiman/uint256"
)
type Evm struct {
code Rom
stack Stack
memory Memory
pc uint64
stopped bool
returndata []byte
}
func NewEvm(_code []byte) *Evm {
return &Evm{
pc: 0,
stopped: true,
stack : Stack{},
code: _code,
returndata: nil,
}
}
func (vm *Evm) Run() []byte {
vm.stopped = false
fmt.Printf("code: ", vm.code)
for !(vm.stopped) {
s := vm.code.Fetch(&(vm.pc), 1)
op := Opcode(STOP)
if (s != nil) {
op = Opcode(s[0])
}
fmt.Printf("pc: %d | opcode: 0x%x -> string: %s\n", vm.pc, op, Instructions[op].name)
push := (&op).IsPush()
if (push != 0) {
b := vm.code.Fetch(&(vm.pc), uint64(push))
x := uint256.NewInt(0)
x = x.SetBytes(b)
vm.stack.Push(x)
} else {
vm.Execute(byte(op))
}
if (op == RETURN) {
return vm.returndata
}
}
return nil
}
func (vm *Evm) Execute(op byte) {
Instructions[op].handler(vm)
}
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