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116 lines
4.0 KiB
Python
116 lines
4.0 KiB
Python
#===----------------------------------------------------------------------===##
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#
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# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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# See https://llvm.org/LICENSE.txt for license information.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#
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#===----------------------------------------------------------------------===##
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"""Commands used to automate testing gdb pretty printers.
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This script is part of a larger framework to test gdb pretty printers. It
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runs the program, detects test cases, checks them, and prints results.
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See gdb_pretty_printer_test.sh.cpp on how to write a test case.
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"""
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from __future__ import print_function
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import re
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import gdb
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import sys
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test_failures = 0
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class CheckResult(gdb.Command):
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def __init__(self):
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super(CheckResult, self).__init__(
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"print_and_compare", gdb.COMMAND_DATA)
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def invoke(self, arg, from_tty):
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try:
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# Stack frame is:
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# 0. StopForDebugger
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# 1. ComparePrettyPrintToChars or ComparePrettyPrintToRegex
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# 2. TestCase
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compare_frame = gdb.newest_frame().older()
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testcase_frame = compare_frame.older()
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test_loc = testcase_frame.find_sal()
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# Use interactive commands in the correct context to get the pretty
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# printed version
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value_str = self._get_value_string(compare_frame, testcase_frame)
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# Ignore the convenience variable name and newline
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value = value_str[value_str.find("= ") + 2:-1]
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gdb.newest_frame().select()
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expectation_val = compare_frame.read_var("expectation")
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check_literal = expectation_val.string(encoding="utf-8")
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if "PrettyPrintToRegex" in compare_frame.name():
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test_fails = not re.match(check_literal, value)
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else:
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test_fails = value != check_literal
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if test_fails:
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global test_failures
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print("FAIL: " + test_loc.symtab.filename +
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":" + str(test_loc.line))
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print("GDB printed:")
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print(" " + repr(value))
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print("Value should match:")
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print(" " + repr(check_literal))
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test_failures += 1
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else:
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print("PASS: " + test_loc.symtab.filename +
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":" + str(test_loc.line))
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except RuntimeError as e:
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# At this point, lots of different things could be wrong, so don't try to
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# recover or figure it out. Don't exit either, because then it's
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# impossible debug the framework itself.
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print("FAIL: Something is wrong in the test framework.")
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print(str(e))
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test_failures += 1
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def _get_value_string(self, compare_frame, testcase_frame):
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compare_frame.select()
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if "ComparePrettyPrint" in compare_frame.name():
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s = gdb.execute("p value", to_string=True)
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else:
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value_str = str(compare_frame.read_var("value"))
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clean_expression_str = value_str.strip("'\"")
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testcase_frame.select()
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s = gdb.execute("p " + clean_expression_str, to_string=True)
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if sys.version_info.major == 2:
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return s.decode("utf-8")
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return s
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def exit_handler(event=None):
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global test_failures
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if test_failures:
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print("FAILED %d cases" % test_failures)
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exit(test_failures)
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# Start code executed at load time
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# Disable terminal paging
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gdb.execute("set height 0")
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gdb.execute("set python print-stack full")
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test_failures = 0
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CheckResult()
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test_bp = gdb.Breakpoint("StopForDebugger")
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test_bp.enabled = True
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test_bp.silent = True
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test_bp.commands = "print_and_compare\ncontinue"
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# "run" won't return if the program exits; ensure the script regains control.
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gdb.events.exited.connect(exit_handler)
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gdb.execute("run")
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# If the program didn't exit, something went wrong, but we don't
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# know what. Fail on exit.
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test_failures += 1
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exit_handler(None)
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