log all opcodes in Python in realtime

log_opcodes.py

import sys
import gc
from dis import get_instructions

def local_trace(frame, event, arg):
    """
    The 'local' trace function, called for *each* opcode (if f_trace_opcodes=True)
    or line (if f_trace_lines=True).
    """
    # Turn on opcode-level tracing for this frame
    frame.f_trace_opcodes = True

    if event == 'opcode':
        offset = frame.f_lasti
        instrs = get_instructions(frame.f_code)
        for instr in instrs:
            if instr.offset == offset:
                print(instr, end='')
    else:
        sys.stderr.write(f"TRACE: event={event}, line={frame.f_lineno}, arg={arg}\n")

    return local_trace

def global_trace(frame, event, arg):
    """
    The 'global' trace function, called for *function calls* and returns.
    Here we decide to attach our local tracer to every new frame.
    """
    # Return the local trace function for the *new* frame
    return local_trace


N=10000000
gc.disable()

def test():
    for _ in range(N):
        bytes.fromhex('')

# Enable tracing
# sys.settrace(global_trace)
test()
# sys.settrace(None)