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import gdb
import os
import re
import sys
import traceback
# testlibdir is set on the GDB command line, via --eval-command python testlibdir=...
sys.path[0:0] = [testlibdir]
# 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='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')
# 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) == 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=...
exec(open(testscript).read())
except AssertionError as err:
sys.stderr.write('\nAssertion traceback:\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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