%run 02_stack.ipynb
%run 03_memory.ipynb
%run 04_storage.ipynb
%run 05_opcodes.ipynb
%run 06_stop.ipynb
%run 07_math.ipynb
%run push.ipynb
OSError                                   Traceback (most recent call last)
File ~/python3.8/lib/python3.8/site-packages/IPython/core/magics/execution.py:701, in ExecutionMagics.run(self, parameter_s, runner, file_finder)
    700     fpath = arg_lst[0]
--> 701     filename = file_finder(fpath)
    702 except IndexError as e:

File ~/python3.8/lib/python3.8/site-packages/IPython/utils/path.py:90, in get_py_filename(name)
     89         return py_name
---> 90 raise IOError("File `%r` not found." % name)

OSError: File `'02_stack.ipynb'` not found.

The above exception was the direct cause of the following exception:

Exception                                 Traceback (most recent call last)
Cell In[1], line 1
----> 1 get_ipython().run_line_magic('run', '02_stack.ipynb')
      2 get_ipython().run_line_magic('run', '03_memory.ipynb')
      3 get_ipython().run_line_magic('run', '04_storage.ipynb')

File ~/python3.8/lib/python3.8/site-packages/IPython/core/interactiveshell.py:2417, in InteractiveShell.run_line_magic(self, magic_name, line, _stack_depth)
   2415     kwargs['local_ns'] = self.get_local_scope(stack_depth)
   2416 with self.builtin_trap:
-> 2417     result = fn(*args, **kwargs)
   2419 # The code below prevents the output from being displayed
   2420 # when using magics with decodator @output_can_be_silenced
   2421 # when the last Python token in the expression is a ';'.
   2422 if getattr(fn, magic.MAGIC_OUTPUT_CAN_BE_SILENCED, False):

File ~/python3.8/lib/python3.8/site-packages/IPython/core/magics/execution.py:712, in ExecutionMagics.run(self, parameter_s, runner, file_finder)
    710     if os.name == 'nt' and re.match(r"^'.*'$",fpath):
    711         warn('For Windows, use double quotes to wrap a filename: %run "mypath\\myfile.py"')
--> 712     raise Exception(msg) from e
    713 except TypeError:
    714     if fpath in sys.meta_path:

Exception: File `'02_stack.ipynb'` not found.


Now we are going to put everything together.

Program Counter#

The program counter indexes into the bytecode. It tells the EVM which opcode to execute next

class EVM:
    def __init__(self,
        self.pc      = 0
        self.stack   = Stack()
        self.memory  = Memory()
        self.storage = Storage()
        self.program  = program
        self.gas      = gas
        self.value    = value
        self.calldata = calldata
        self.stop_flag   = False
        self.revert_flag = False
        self.returndata = []
        self.logs       = []
    def peek(self): return self.program[self.pc]
    def gas_dec(self, amount):
        if self.gas - amount < 0: 
            raise Exception("out of gas")
        self.gas -= amount

    def should_execute_next_opcode(self):
        if self.pc > len(self.program)-1: return False
        if self.stop_flag               : return False
        if self.revert_flag             : return False
        return True
    def run(self):
        while self.should_execute_next_opcode():
            op = self.program[self.pc]
            if op == STOP: stop(self)
            if op == ADD: add(self)

            if op == PUSH1: _push(self, 1)
    def reset(self):
        self.pc      = 0
        self.stack   = Stack()
        self.memory  = Memory()
        self.storage = Storage()