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Ethereum's Virtual Machine, in all its glory.

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evm lib evm operation push.ex
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lib/evm/operation/push.ex 

defmodule EVM.Operation.Push do

  @doc """

  Place n-byte item on stack



  ## Examples



      iex> EVM.Operation.Push.push_n(1, [], %{machine_state: %EVM.MachineState{stack: [], program_counter: 1}, exec_env: %EVM.ExecEnv{machine_code: <<0x10, 0x11, 0x12, 0x13>>}})

      0x12



      iex> EVM.Operation.Push.push_n(1, [], %{machine_state: %EVM.MachineState{stack: [], program_counter: 2}, exec_env: %EVM.ExecEnv{machine_code: <<0x10, 0x11, 0x12, 0x13>>}})

      0x13



      iex> EVM.Operation.Push.push_n(1, [], %{machine_state: %EVM.MachineState{stack: [], program_counter: 3}, exec_env: %EVM.ExecEnv{machine_code: <<0x10, 0x11, 0x12, 0x13>>}})

      0x00



      iex> EVM.Operation.Push.push_n(1, [], %{machine_state: %EVM.MachineState{stack: [], program_counter: 4}, exec_env: %EVM.ExecEnv{machine_code: <<0x10, 0x11, 0x12, 0x13>>}})

      0x00



      iex> EVM.Operation.Push.push_n(1, [], %{machine_state: %EVM.MachineState{stack: [], program_counter: 100}, exec_env: %EVM.ExecEnv{machine_code: <<0x10, 0x11, 0x12, 0x13>>}})

      0x00



      iex> EVM.Operation.Push.push_n(6, [], %{machine_state: %EVM.MachineState{stack: [], program_counter: 0}, exec_env: %EVM.ExecEnv{machine_code: <<0xFF, 0x10, 0x11, 0x12, 0x13>>}})

      17665503723520



      iex> EVM.Operation.Push.push_n(16, [], %{machine_state: %EVM.MachineState{stack: [], program_counter: 100}, exec_env: %EVM.ExecEnv{machine_code: <<0x10, 0x11, 0x12, 0x13>>}})

      0x00

  """

  @spec push_n(integer(), Operation.stack_args, Operation.vm_map) :: Operation.op_result

  def push_n(n, _args, %{machine_state: machine_state, exec_env: %{machine_code: machine_code}}) do

    EVM.Memory.read_zeroed_memory(machine_code, machine_state.program_counter + 1, n)

      |> :binary.decode_unsigned

  end

end