Benjamin Peterson
parent
9bab65c259
commit
e65282114e
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@ -19,7 +19,7 @@ typedef struct _traceback {
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PyAPI_FUNC(int) PyTraceBack_Here(struct _frame *);
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PyAPI_FUNC(int) PyTraceBack_Print(PyObject *, PyObject *);
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PyAPI_FUNC(int) Py_DisplaySourceLine(PyObject *, const char *, int);
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PyAPI_FUNC(int) Py_DisplaySourceLine(PyObject *, const char *, int, int);
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/* Reveal traceback type so we can typecheck traceback objects */
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PyAPI_DATA(PyTypeObject) PyTraceBack_Type;
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@ -278,6 +278,30 @@ class TestContext(unittest.TestCase):
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else:
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self.fail("No exception raised")
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def test_cycle_broken(self):
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# Self-cycles (when re-raising a caught exception) are broken
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try:
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try:
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1/0
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except ZeroDivisionError as e:
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raise e
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except ZeroDivisionError as e:
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self.failUnless(e.__context__ is None, e.__context__)
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def test_reraise_cycle_broken(self):
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# Non-trivial context cycles (through re-raising a previous exception)
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# are broken too.
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try:
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try:
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xyzzy
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except NameError as a:
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try:
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1/0
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except ZeroDivisionError:
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raise a
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except NameError as e:
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self.failUnless(e.__context__.__context__ is None)
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class TestRemovedFunctionality(unittest.TestCase):
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def test_tuples(self):
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@ -1,10 +1,11 @@
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"""Test cases for traceback module"""
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from _testcapi import traceback_print
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from _testcapi import traceback_print, exception_print
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from io import StringIO
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import sys
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import unittest
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from test.support import run_unittest, is_jython, Error
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import re
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from test.support import run_unittest, is_jython, Error, captured_output
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import traceback
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@ -19,7 +20,7 @@ else:
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raise Error("unable to create test traceback string")
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class TracebackCases(unittest.TestCase):
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class SyntaxTracebackCases(unittest.TestCase):
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# For now, a very minimal set of tests. I want to be sure that
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# formatting of SyntaxErrors works based on changes for 2.1.
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@ -99,12 +100,135 @@ class TracebackFormatTests(unittest.TestCase):
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banner, location, source_line = tb_lines
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self.assert_(banner.startswith('Traceback'))
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self.assert_(location.startswith(' File'))
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self.assert_(source_line.startswith('raise'))
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self.assert_(source_line.startswith(' raise'))
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cause_message = (
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"\nThe above exception was the direct cause "
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"of the following exception:\n\n")
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context_message = (
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"\nDuring handling of the above exception, "
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"another exception occurred:\n\n")
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boundaries = re.compile(
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'(%s|%s)' % (re.escape(cause_message), re.escape(context_message)))
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class BaseExceptionReportingTests:
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def get_exception(self, exception_or_callable):
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if isinstance(exception_or_callable, Exception):
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return exception_or_callable
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try:
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exception_or_callable()
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except Exception as e:
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return e
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def zero_div(self):
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1/0 # In zero_div
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def check_zero_div(self, msg):
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lines = msg.splitlines()
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self.assert_(lines[-3].startswith(' File'))
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self.assert_('1/0 # In zero_div' in lines[-2], lines[-2])
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self.assert_(lines[-1].startswith('ZeroDivisionError'), lines[-1])
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def test_simple(self):
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try:
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1/0 # Marker
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except ZeroDivisionError as _:
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e = _
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lines = self.get_report(e).splitlines()
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self.assertEquals(len(lines), 4)
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self.assert_(lines[0].startswith('Traceback'))
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self.assert_(lines[1].startswith(' File'))
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self.assert_('1/0 # Marker' in lines[2])
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self.assert_(lines[3].startswith('ZeroDivisionError'))
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def test_cause(self):
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def inner_raise():
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try:
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self.zero_div()
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except ZeroDivisionError as e:
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raise KeyError from e
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def outer_raise():
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inner_raise() # Marker
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blocks = boundaries.split(self.get_report(outer_raise))
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self.assertEquals(len(blocks), 3)
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self.assertEquals(blocks[1], cause_message)
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self.check_zero_div(blocks[0])
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self.assert_('inner_raise() # Marker' in blocks[2])
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def test_context(self):
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def inner_raise():
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try:
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self.zero_div()
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except ZeroDivisionError:
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raise KeyError
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def outer_raise():
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inner_raise() # Marker
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blocks = boundaries.split(self.get_report(outer_raise))
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self.assertEquals(len(blocks), 3)
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self.assertEquals(blocks[1], context_message)
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self.check_zero_div(blocks[0])
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self.assert_('inner_raise() # Marker' in blocks[2])
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def test_cause_recursive(self):
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def inner_raise():
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try:
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try:
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self.zero_div()
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except ZeroDivisionError as e:
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z = e
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raise KeyError from e
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except KeyError as e:
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raise z from e
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def outer_raise():
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inner_raise() # Marker
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blocks = boundaries.split(self.get_report(outer_raise))
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self.assertEquals(len(blocks), 3)
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self.assertEquals(blocks[1], cause_message)
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# The first block is the KeyError raised from the ZeroDivisionError
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self.assert_('raise KeyError from e' in blocks[0])
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self.assert_('1/0' not in blocks[0])
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# The second block (apart from the boundary) is the ZeroDivisionError
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# re-raised from the KeyError
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self.assert_('inner_raise() # Marker' in blocks[2])
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self.check_zero_div(blocks[2])
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class PyExcReportingTests(BaseExceptionReportingTests, unittest.TestCase):
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#
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# This checks reporting through the 'traceback' module, with both
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# format_exception() and print_exception().
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#
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def get_report(self, e):
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e = self.get_exception(e)
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s = ''.join(
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traceback.format_exception(type(e), e, e.__traceback__))
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with captured_output("stderr") as sio:
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traceback.print_exception(type(e), e, e.__traceback__)
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self.assertEquals(sio.getvalue(), s)
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return s
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class CExcReportingTests(BaseExceptionReportingTests, unittest.TestCase):
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#
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# This checks built-in reporting by the interpreter.
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#
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def get_report(self, e):
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e = self.get_exception(e)
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with captured_output("stderr") as s:
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exception_print(e)
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return s.getvalue()
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def test_main():
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run_unittest(TracebackCases, TracebackFormatTests)
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run_unittest(__name__)
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if __name__ == "__main__":
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test_main()
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@ -3,6 +3,7 @@
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import linecache
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import sys
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import types
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import itertools
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__all__ = ['extract_stack', 'extract_tb', 'format_exception',
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'format_exception_only', 'format_list', 'format_stack',
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@ -107,7 +108,32 @@ def extract_tb(tb, limit = None):
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return list
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def print_exception(etype, value, tb, limit=None, file=None):
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_cause_message = (
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"\nThe above exception was the direct cause "
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"of the following exception:\n")
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_context_message = (
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"\nDuring handling of the above exception, "
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"another exception occurred:\n")
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def _iter_chain(exc, custom_tb=None, seen=None):
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if seen is None:
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seen = set()
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seen.add(exc)
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its = []
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cause = exc.__cause__
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context = exc.__context__
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if cause is not None and cause not in seen:
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its.append(_iter_chain(cause, None, seen))
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its.append([(_cause_message, None)])
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if context is not None and context is not cause and context not in seen:
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its.append(_iter_chain(context, None, seen))
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its.append([(_context_message, None)])
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its.append([(exc, custom_tb or exc.__traceback__)])
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return itertools.chain(*its)
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def print_exception(etype, value, tb, limit=None, file=None, chain=True):
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"""Print exception up to 'limit' stack trace entries from 'tb' to 'file'.
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This differs from print_tb() in the following ways: (1) if
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@ -120,15 +146,23 @@ def print_exception(etype, value, tb, limit=None, file=None):
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"""
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if file is None:
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file = sys.stderr
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if chain:
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values = _iter_chain(value, tb)
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else:
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values = [(value, tb)]
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for value, tb in values:
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if isinstance(value, str):
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_print(file, value)
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continue
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if tb:
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_print(file, 'Traceback (most recent call last):')
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print_tb(tb, limit, file)
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lines = format_exception_only(etype, value)
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lines = format_exception_only(type(value), value)
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for line in lines[:-1]:
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_print(file, line, ' ')
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_print(file, lines[-1], '')
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def format_exception(etype, value, tb, limit = None):
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def format_exception(etype, value, tb, limit=None, chain=True):
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"""Format a stack trace and the exception information.
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The arguments have the same meaning as the corresponding arguments
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@ -137,12 +171,19 @@ def format_exception(etype, value, tb, limit = None):
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these lines are concatenated and printed, exactly the same text is
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printed as does print_exception().
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"""
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if tb:
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list = ['Traceback (most recent call last):\n']
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list = list + format_tb(tb, limit)
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else:
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list = []
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list = list + format_exception_only(etype, value)
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if chain:
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values = _iter_chain(value, tb)
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else:
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values = [(value, tb)]
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for value, tb in values:
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if isinstance(value, str):
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list.append(value + '\n')
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continue
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if tb:
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list.append('Traceback (most recent call last):\n')
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list.extend(format_tb(tb, limit))
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list.extend(format_exception_only(type(value), value))
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return list
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def format_exception_only(etype, value):
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@ -208,33 +249,34 @@ def _some_str(value):
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return '<unprintable %s object>' % type(value).__name__
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def print_exc(limit=None, file=None):
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def print_exc(limit=None, file=None, chain=True):
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"""Shorthand for 'print_exception(*sys.exc_info(), limit, file)'."""
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if file is None:
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file = sys.stderr
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try:
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etype, value, tb = sys.exc_info()
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print_exception(etype, value, tb, limit, file)
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print_exception(etype, value, tb, limit, file, chain)
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finally:
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etype = value = tb = None
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def format_exc(limit=None):
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def format_exc(limit=None, chain=True):
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"""Like print_exc() but return a string."""
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try:
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etype, value, tb = sys.exc_info()
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return ''.join(format_exception(etype, value, tb, limit))
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return ''.join(
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format_exception(etype, value, tb, limit, chain))
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finally:
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etype = value = tb = None
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def print_last(limit=None, file=None):
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def print_last(limit=None, file=None, chain=True):
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"""This is a shorthand for 'print_exception(sys.last_type,
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sys.last_value, sys.last_traceback, limit, file)'."""
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if file is None:
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file = sys.stderr
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print_exception(sys.last_type, sys.last_value, sys.last_traceback,
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limit, file)
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limit, file, chain)
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def print_stack(f=None, limit=None, file=None):
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@ -22,6 +22,8 @@ Core and Builtins
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- Issue #3236: Return small longs from PyLong_FromString.
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- Exception tracebacks now support exception chaining.
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Library
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-------
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@ -35,6 +37,8 @@ Library
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- All the u* variant functions and methods in gettext have been renamed to their
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none u* siblings.
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- The traceback module has been expanded to handle chained exceptions.
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C API
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-----
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@ -951,6 +951,26 @@ traceback_print(PyObject *self, PyObject *args)
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Py_RETURN_NONE;
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}
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/* To test the format of exceptions as printed out. */
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static PyObject *
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exception_print(PyObject *self, PyObject *args)
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{
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PyObject *value;
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PyObject *tb;
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if (!PyArg_ParseTuple(args, "O:exception_print",
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&value))
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return NULL;
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tb = PyException_GetTraceback(value);
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PyErr_Display((PyObject *) Py_TYPE(value), value, tb);
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Py_XDECREF(tb);
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Py_RETURN_NONE;
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}
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static PyMethodDef TestMethods[] = {
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{"raise_exception", raise_exception, METH_VARARGS},
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{"test_config", (PyCFunction)test_config, METH_NOARGS},
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@ -995,6 +1015,7 @@ static PyMethodDef TestMethods[] = {
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{"profile_int", profile_int, METH_NOARGS},
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#endif
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{"traceback_print", traceback_print, METH_VARARGS},
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{"exception_print", exception_print, METH_VARARGS},
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{NULL, NULL} /* sentinel */
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};
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@ -256,7 +256,6 @@ show_warning(PyObject *filename, int lineno, PyObject *text, PyObject
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Py_XDECREF(name);
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/* Print " source_line\n" */
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PyFile_WriteString(" ", f_stderr);
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if (sourceline) {
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char *source_line_str = PyUnicode_AsString(sourceline);
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while (*source_line_str == ' ' || *source_line_str == '\t' ||
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@ -267,7 +266,7 @@ show_warning(PyObject *filename, int lineno, PyObject *text, PyObject
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PyFile_WriteString("\n", f_stderr);
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}
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else
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Py_DisplaySourceLine(f_stderr, PyUnicode_AsString(filename), lineno);
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Py_DisplaySourceLine(f_stderr, PyUnicode_AsString(filename), lineno, 2);
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PyErr_Clear();
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}
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@ -84,9 +84,24 @@ PyErr_SetObject(PyObject *exception, PyObject *value)
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return;
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value = fixed_value;
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}
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/* Avoid reference cycles through the context chain.
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This is O(chain length) but context chains are
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usually very short. Sensitive readers may try
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to inline the call to PyException_GetContext. */
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if (tstate->exc_value != value) {
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PyObject *o = tstate->exc_value, *context;
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while ((context = PyException_GetContext(o))) {
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Py_DECREF(context);
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if (context == value) {
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PyException_SetContext(o, NULL);
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break;
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}
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o = context;
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}
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Py_INCREF(tstate->exc_value);
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PyException_SetContext(value, tstate->exc_value);
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}
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}
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if (value != NULL && PyExceptionInstance_Check(value))
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tb = PyException_GetTraceback(value);
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Py_XINCREF(exception);
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@ -160,6 +175,9 @@ PyErr_ExceptionMatches(PyObject *exc)
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/* Used in many places to normalize a raised exception, including in
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eval_code2(), do_raise(), and PyErr_Print()
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XXX: should PyErr_NormalizeException() also call
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PyException_SetTraceback() with the resulting value and tb?
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*/
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void
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PyErr_NormalizeException(PyObject **exc, PyObject **val, PyObject **tb)
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@ -1242,18 +1242,19 @@ PyErr_PrintEx(int set_sys_last_vars)
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if (exception == NULL)
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return;
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PyErr_NormalizeException(&exception, &v, &tb);
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tb = tb ? tb : Py_None;
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PyException_SetTraceback(v, tb);
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if (exception == NULL)
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return;
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/* Now we know v != NULL too */
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if (set_sys_last_vars) {
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PySys_SetObject("last_type", exception);
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PySys_SetObject("last_value", v);
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PySys_SetObject("last_traceback", tb ? tb : Py_None);
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PySys_SetObject("last_traceback", tb);
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}
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hook = PySys_GetObject("excepthook");
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if (hook) {
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PyObject *args = PyTuple_Pack(3,
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exception, v, tb ? tb : Py_None);
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PyObject *args = PyTuple_Pack(3, exception, v, tb);
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PyObject *result = PyEval_CallObject(hook, args);
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if (result == NULL) {
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PyObject *exception2, *v2, *tb2;
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@ -1293,21 +1294,16 @@ PyErr_PrintEx(int set_sys_last_vars)
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|||
Py_XDECREF(tb);
|
||||
}
|
||||
|
||||
void
|
||||
PyErr_Display(PyObject *exception, PyObject *value, PyObject *tb)
|
||||
static void
|
||||
print_exception(PyObject *f, PyObject *value)
|
||||
{
|
||||
int err = 0;
|
||||
PyObject *f = PySys_GetObject("stderr");
|
||||
PyObject *type, *tb;
|
||||
|
||||
Py_INCREF(value);
|
||||
if (f == Py_None) {
|
||||
/* pass */
|
||||
}
|
||||
else if (f == NULL) {
|
||||
_PyObject_Dump(value);
|
||||
fprintf(stderr, "lost sys.stderr\n");
|
||||
}
|
||||
else {
|
||||
fflush(stdout);
|
||||
type = (PyObject *) Py_TYPE(value);
|
||||
tb = PyException_GetTraceback(value);
|
||||
if (tb && tb != Py_None)
|
||||
err = PyTraceBack_Print(tb, f);
|
||||
if (err == 0 &&
|
||||
|
|
@ -1343,16 +1339,17 @@ PyErr_Display(PyObject *exception, PyObject *value, PyObject *tb)
|
|||
if (err) {
|
||||
/* Don't do anything else */
|
||||
}
|
||||
else if (PyExceptionClass_Check(exception)) {
|
||||
else {
|
||||
assert(PyExceptionClass_Check(type));
|
||||
PyObject* moduleName;
|
||||
char* className = PyExceptionClass_Name(exception);
|
||||
char* className = PyExceptionClass_Name(type);
|
||||
if (className != NULL) {
|
||||
char *dot = strrchr(className, '.');
|
||||
if (dot != NULL)
|
||||
className = dot+1;
|
||||
}
|
||||
|
||||
moduleName = PyObject_GetAttrString(exception, "__module__");
|
||||
moduleName = PyObject_GetAttrString(type, "__module__");
|
||||
if (moduleName == NULL || !PyUnicode_Check(moduleName))
|
||||
{
|
||||
Py_DECREF(moduleName);
|
||||
|
|
@ -1374,8 +1371,6 @@ PyErr_Display(PyObject *exception, PyObject *value, PyObject *tb)
|
|||
err = PyFile_WriteString(className, f);
|
||||
}
|
||||
}
|
||||
else
|
||||
err = PyFile_WriteObject(exception, f, Py_PRINT_RAW);
|
||||
if (err == 0 && (value != Py_None)) {
|
||||
PyObject *s = PyObject_Str(value);
|
||||
/* only print colon if the str() of the
|
||||
|
|
@ -1392,7 +1387,7 @@ PyErr_Display(PyObject *exception, PyObject *value, PyObject *tb)
|
|||
}
|
||||
/* try to write a newline in any case */
|
||||
err += PyFile_WriteString("\n", f);
|
||||
}
|
||||
Py_XDECREF(tb);
|
||||
Py_DECREF(value);
|
||||
/* If an error happened here, don't show it.
|
||||
XXX This is wrong, but too many callers rely on this behavior. */
|
||||
|
|
@ -1400,6 +1395,82 @@ PyErr_Display(PyObject *exception, PyObject *value, PyObject *tb)
|
|||
PyErr_Clear();
|
||||
}
|
||||
|
||||
static const char *cause_message =
|
||||
"\nThe above exception was the direct cause "
|
||||
"of the following exception:\n\n";
|
||||
|
||||
static const char *context_message =
|
||||
"\nDuring handling of the above exception, "
|
||||
"another exception occurred:\n\n";
|
||||
|
||||
static void
|
||||
print_exception_recursive(PyObject *f, PyObject *value, PyObject *seen)
|
||||
{
|
||||
int err = 0, res;
|
||||
PyObject *cause, *context;
|
||||
|
||||
if (seen != NULL) {
|
||||
/* Exception chaining */
|
||||
if (PySet_Add(seen, value) == -1)
|
||||
PyErr_Clear();
|
||||
else if (PyExceptionInstance_Check(value)) {
|
||||
cause = PyException_GetCause(value);
|
||||
context = PyException_GetContext(value);
|
||||
if (cause) {
|
||||
res = PySet_Contains(seen, cause);
|
||||
if (res == -1)
|
||||
PyErr_Clear();
|
||||
if (res == 0) {
|
||||
print_exception_recursive(
|
||||
f, cause, seen);
|
||||
err |= PyFile_WriteString(
|
||||
cause_message, f);
|
||||
}
|
||||
}
|
||||
if (context) {
|
||||
res = PySet_Contains(seen, context);
|
||||
if (res == -1)
|
||||
PyErr_Clear();
|
||||
if (res == 0) {
|
||||
print_exception_recursive(
|
||||
f, context, seen);
|
||||
err |= PyFile_WriteString(
|
||||
context_message, f);
|
||||
}
|
||||
}
|
||||
Py_XDECREF(context);
|
||||
Py_XDECREF(cause);
|
||||
}
|
||||
}
|
||||
print_exception(f, value);
|
||||
if (err != 0)
|
||||
PyErr_Clear();
|
||||
}
|
||||
|
||||
void
|
||||
PyErr_Display(PyObject *exception, PyObject *value, PyObject *tb)
|
||||
{
|
||||
PyObject *seen;
|
||||
PyObject *f = PySys_GetObject("stderr");
|
||||
if (f == Py_None) {
|
||||
/* pass */
|
||||
}
|
||||
else if (f == NULL) {
|
||||
_PyObject_Dump(value);
|
||||
fprintf(stderr, "lost sys.stderr\n");
|
||||
}
|
||||
else {
|
||||
/* We choose to ignore seen being possibly NULL, and report
|
||||
at least the main exception (it could be a MemoryError).
|
||||
*/
|
||||
seen = PySet_New(NULL);
|
||||
if (seen == NULL)
|
||||
PyErr_Clear();
|
||||
print_exception_recursive(f, value, seen);
|
||||
Py_XDECREF(seen);
|
||||
}
|
||||
}
|
||||
|
||||
PyObject *
|
||||
PyRun_StringFlags(const char *str, int start, PyObject *globals,
|
||||
PyObject *locals, PyCompilerFlags *flags)
|
||||
|
|
|
|||
|
|
@ -129,7 +129,7 @@ PyTraceBack_Here(PyFrameObject *frame)
|
|||
}
|
||||
|
||||
int
|
||||
Py_DisplaySourceLine(PyObject *f, const char *filename, int lineno)
|
||||
Py_DisplaySourceLine(PyObject *f, const char *filename, int lineno, int indent)
|
||||
{
|
||||
int err = 0;
|
||||
FILE *xfp = NULL;
|
||||
|
|
@ -139,8 +139,6 @@ Py_DisplaySourceLine(PyObject *f, const char *filename, int lineno)
|
|||
|
||||
if (filename == NULL)
|
||||
return -1;
|
||||
/* This is needed by Emacs' compile command */
|
||||
#define FMT " File \"%.500s\", line %d, in %.500s\n"
|
||||
xfp = fopen(filename, "r" PY_STDIOTEXTMODE);
|
||||
if (xfp == NULL) {
|
||||
/* Search tail of filename in sys.path before giving up */
|
||||
|
|
@ -203,9 +201,24 @@ Py_DisplaySourceLine(PyObject *f, const char *filename, int lineno)
|
|||
} while (*pLastChar != '\0' && *pLastChar != '\n');
|
||||
}
|
||||
if (i == lineno) {
|
||||
char buf[11];
|
||||
char *p = linebuf;
|
||||
while (*p == ' ' || *p == '\t' || *p == '\014')
|
||||
p++;
|
||||
|
||||
/* Write some spaces before the line */
|
||||
strcpy(buf, " ");
|
||||
assert (strlen(buf) == 10);
|
||||
while (indent > 0) {
|
||||
if(indent < 10)
|
||||
buf[indent] = '\0';
|
||||
err = PyFile_WriteString(buf, f);
|
||||
if (err != 0)
|
||||
break;
|
||||
indent -= 10;
|
||||
}
|
||||
|
||||
if (err == 0)
|
||||
err = PyFile_WriteString(p, f);
|
||||
if (err == 0 && strchr(p, '\n') == NULL)
|
||||
err = PyFile_WriteString("\n", f);
|
||||
|
|
@ -228,7 +241,7 @@ tb_displayline(PyObject *f, const char *filename, int lineno, const char *name)
|
|||
err = PyFile_WriteString(linebuf, f);
|
||||
if (err != 0)
|
||||
return err;
|
||||
return Py_DisplaySourceLine(f, filename, lineno);
|
||||
return Py_DisplaySourceLine(f, filename, lineno, 4);
|
||||
}
|
||||
|
||||
static int
|
||||
|
|
|
|||
Loading…
Reference in New Issue