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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this file,
# You can obtain one at http://mozilla.org/MPL/2.0/.
# flake8: noqa: F821
import gdb
import re
import sys
import traceback
# testlibdir is set on the GDB command line, via --eval-command python testlibdir=...
sys.path[0:0] = [testlibdir]
active_fragment = None
# Run the C++ fragment named |fragment|, stopping on entry to |function|
# ('breakpoint', by default) and then select the calling frame.
def run_fragment(fragment, function="gdb-tests.cpp:breakpoint"):
# Arrange to stop at a reasonable place in the test program.
bp = gdb.Breakpoint(function)
try:
gdb.execute("run %s" % (fragment,))
# Check that we did indeed stop by hitting the breakpoint we set.
assert bp.hit_count == 1
finally:
bp.delete()
gdb.execute("frame 1")
global active_fragment
active_fragment = fragment
# Assert that |actual| is equal to |expected|; if not, complain in a helpful way.
def assert_eq(actual, expected):
if actual != expected:
raise AssertionError(
"""Unexpected result:
expected: %r
actual: %r"""
% (expected, actual)
)
# Assert that |expected| regex matches |actual| result; if not, complain in a helpful way.
def assert_match(actual, expected):
if re.match(expected, actual, re.MULTILINE) is None:
raise AssertionError(
"""Unexpected result:
expected pattern: %r
actual: %r"""
% (expected, actual)
)
# Assert that |value|'s pretty-printed form is |form|. If |value| is a
# string, then evaluate it with gdb.parse_and_eval to produce a value.
def assert_pretty(value, form):
if isinstance(value, str):
value = gdb.parse_and_eval(value)
assert_eq(str(value), form)
# Assert that |value|'s pretty-printed form match the pattern |pattern|. If
# |value| is a string, then evaluate it with gdb.parse_and_eval to produce a
# value.
def assert_regexp_pretty(value, form):
if isinstance(value, str):
value = gdb.parse_and_eval(value)
assert_match(str(value), form)
# Check that the list of registered pretty-printers includes one named
# |printer|, with a subprinter named |subprinter|.
def assert_subprinter_registered(printer, subprinter):
# Match a line containing |printer| followed by a colon, and then a
# series of more-indented lines containing |subprinter|.
names = {"printer": re.escape(printer), "subprinter": re.escape(subprinter)}
pat = r"^( +)%(printer)s *\n(\1 +.*\n)*\1 +%(subprinter)s *\n" % names
output = gdb.execute("info pretty-printer", to_string=True)
if not re.search(pat, output, re.MULTILINE):
raise AssertionError(
"assert_subprinter_registered failed to find pretty-printer:\n"
" %s:%s\n"
"'info pretty-printer' says:\n"
"%s" % (printer, subprinter, output)
)
# Request full stack traces for Python errors.
gdb.execute("set python print-stack full")
# Tell GDB not to ask the user about the things we tell it to do.
gdb.execute("set confirm off", False)
# Some print settings that make testing easier.
gdb.execute("set print static-members off")
gdb.execute("set print address off")
gdb.execute("set print pretty off")
gdb.execute("set width 0")
try:
# testscript is set on the GDB command line, via:
# --eval-command python testscript=...
execfile(testscript, globals(), locals())
except AssertionError as err:
header = "\nAssertion traceback"
if active_fragment:
header += " for " + active_fragment
sys.stderr.write(header + ":\n")
(t, v, tb) = sys.exc_info()
traceback.print_tb(tb)
sys.stderr.write("\nTest assertion failed:\n")
sys.stderr.write(str(err))
sys.exit(1)
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