1# Copyright (C) 2015-2023 Free Software Foundation, Inc.
2
3# This program is free software; you can redistribute it and/or modify
4# it under the terms of the GNU General Public License as published by
5# the Free Software Foundation; either version 3 of the License, or
6# (at your option) any later version.
7#
8# This program is distributed in the hope that it will be useful,
9# but WITHOUT ANY WARRANTY; without even the implied warranty of
10# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11# GNU General Public License for more details.
12#
13# You should have received a copy of the GNU General Public License
14# along with this program.  If not, see <http://www.gnu.org/licenses/>.
15
16# Test printing of std::cerr.
17# libstdc++ is typically near the end of the list of shared libraries,
18# and thus searched last (or near last).
19# Plus llvm had a bug where its pubnames output that gold uses to generate
20# the index caused a massive perf regression (basically it emitted an entry
21# for every CU that used it, whereas we only want the CU with the
22# definition).
23#
24# Note: One difference between this test and gmonster-ptype-string.py
25# is that here we do not pre-expand the symtab: we don't want include
26# GDB's slowness in searching expanded symtabs first to color these results.
27
28from perftest import perftest
29from perftest import measure
30from perftest import utils
31
32
33class PrintCerr(perftest.TestCaseWithBasicMeasurements):
34    def __init__(self, name, run_names, binfile):
35        super(PrintCerr, self).__init__(name)
36        self.run_names = run_names
37        self.binfile = binfile
38
39    def warm_up(self):
40        pass
41
42    def execute_test(self):
43        for run in self.run_names:
44            this_run_binfile = "%s-%s" % (self.binfile, utils.convert_spaces(run))
45            utils.select_file(this_run_binfile)
46            utils.runto_main()
47            iteration = 5
48            while iteration > 0:
49                utils.safe_execute("mt flush symbol-cache")
50                func = lambda: utils.safe_execute("print gm_std::cerr")
51                self.measure.measure(func, run)
52                iteration -= 1
53