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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
}
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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