(frame, event, arg)
| 49 | pending_line = [None] |
| 50 | |
| 51 | def tracer(frame, event, arg): |
| 52 | if frame.f_code.co_filename != '<demo>': |
| 53 | return tracer |
| 54 | |
| 55 | func_name = frame.f_code.co_name |
| 56 | lineno = frame.f_lineno |
| 57 | |
| 58 | if event == 'line' and not tracing_active[0]: |
| 59 | pending_line[0] = {'type': 'line', 'line': lineno} |
| 60 | return tracer |
| 61 | |
| 62 | # Start tracing only once main() is called |
| 63 | if event == 'call' and func_name == 'main': |
| 64 | tracing_active[0] = True |
| 65 | # Emit the buffered line event (the main() call line) at ts=0 |
| 66 | if pending_line[0]: |
| 67 | pending_line[0]['ts'] = 0 |
| 68 | trace_events.append(pending_line[0]) |
| 69 | pending_line[0] = None |
| 70 | timestamp[0] = timestamp_step |
| 71 | |
| 72 | # Skip events until we've entered main() |
| 73 | if not tracing_active[0]: |
| 74 | return tracer |
| 75 | |
| 76 | if event == 'call': |
| 77 | trace_events.append({ |
| 78 | 'type': 'call', |
| 79 | 'func': func_name, |
| 80 | 'line': lineno, |
| 81 | 'ts': timestamp[0], |
| 82 | }) |
| 83 | elif event == 'line': |
| 84 | trace_events.append({ |
| 85 | 'type': 'line', |
| 86 | 'line': lineno, |
| 87 | 'ts': timestamp[0], |
| 88 | }) |
| 89 | elif event == 'return': |
| 90 | try: |
| 91 | value = arg if arg is None else repr(arg) |
| 92 | except Exception: |
| 93 | value = '<unprintable>' |
| 94 | trace_events.append({ |
| 95 | 'type': 'return', |
| 96 | 'func': func_name, |
| 97 | 'ts': timestamp[0], |
| 98 | 'value': value, |
| 99 | }) |
| 100 | |
| 101 | if func_name == 'main': |
| 102 | tracing_active[0] = False |
| 103 | |
| 104 | timestamp[0] += timestamp_step |
| 105 | return tracer |
| 106 | |
| 107 | # Suppress print output during tracing |
| 108 | old_stdout = sys.stdout |
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