Re: [PATCH 3/3] Perf test case: skip-prologue

Yao Qi
2013-12-03T07:34:20Z

On 11/29/2013 10:24 PM, Yao Qi wrote:
> This patch add a perf test case on skip-prologue by inserting
> breakpoints on two functions many times, in order to exercise
> skip-prologue.
>
> gdb/testsuite:
>
> 2013-11-29 Yao Qi<yao@codesourcery.com>
>
> * gdb.perf/skip-prologue.c: New.
> * gdb.perf/skip-prologue.exp: New.
> * gdb.perf/skip-prologue.py: New.

I update this test case to allow setting the number of iterations by

make check-perf RUNTESTFLAGS='skip-prologue.exp SKIP_PROLOGUE_COUNT=500'

--
Yao (é½å°§)

gdb/testsuite:

2013-12-03 Yao Qi <yao@codesourcery.com>

* gdb.perf/skip-prologue.c: New.
* gdb.perf/skip-prologue.exp: New.
* gdb.perf/skip-prologue.py: New.
---
gdb/testsuite/gdb.perf/skip-prologue.c | 48 +++++++++++++++++++++
gdb/testsuite/gdb.perf/skip-prologue.exp | 69 ++++++++++++++++++++++++++++++
gdb/testsuite/gdb.perf/skip-prologue.py | 40 +++++++++++++++++
3 files changed, 157 insertions(+), 0 deletions(-)
create mode 100644 gdb/testsuite/gdb.perf/skip-prologue.c
create mode 100644 gdb/testsuite/gdb.perf/skip-prologue.exp
create mode 100644 gdb/testsuite/gdb.perf/skip-prologue.py

diff --git a/gdb/testsuite/gdb.perf/skip-prologue.c b/gdb/testsuite/gdb.perf/skip-prologue.c
new file mode 100644
index 0000000..a195f55
--- /dev/null
+++ b/gdb/testsuite/gdb.perf/skip-prologue.c
@@ -0,0 +1,48 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright (C) 2013 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* GDB will analyze the prologue of functions f1 and f2. */
+
+struct foo
+{
+ int a[32];
+};
+
+static int
+f1 (void)
+{
+ return 0;
+}
+
+static double
+f2 (int a, long long b, double c, struct foo f)
+{
+ f.a[0] = a + (int) b + c;
+
+ return c + 0.2;
+}
+
+int
+main (void)
+{
+ struct foo f;
+
+ f1 ();
+ f2 (0, 0, 0.1, f);
+
+ return 0;
+}
diff --git a/gdb/testsuite/gdb.perf/skip-prologue.exp b/gdb/testsuite/gdb.perf/skip-prologue.exp
new file mode 100644
index 0000000..53ada49
--- /dev/null
+++ b/gdb/testsuite/gdb.perf/skip-prologue.exp
@@ -0,0 +1,69 @@
+# Copyright (C) 2013 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+# This test case is to test the performance of GDB when it analyzes the
+# function prologue.
+# There is one parameter in this test:
+# - SKIP_PROLOGUE_COUNT is the number that GDB inserts breakpoints on
+# function f1 and f2 and removes them.
+
+load_lib perftest.exp
+
+if [skip_perf_tests] {
+ return 0
+}
+
+standard_testfile .c
+set executable $testfile
+set expfile $testfile.exp
+
+# make check-perf RUNTESTFLAGS='skip-prologue.exp SKIP_PROLOGUE_COUNT=500'
+if ![info exists SKIP_PROLOGUE_COUNT] {
+ set SKIP_PROLOGUE_COUNT 500
+}
+
+PerfTest::assemble {
+ global srcdir subdir srcfile binfile
+
+ if { [gdb_compile "$srcdir/$subdir/$srcfile" ${binfile} executable {debug}] != "" } {
+ return -1
+ }
+
+ return 0
+} {
+ global binfile
+ global gdb_prompt
+
+ clean_restart $binfile
+
+ if ![runto_main] {
+ fail "Can't run to main"
+ return -1
+ }
+} {
+ global SKIP_PROLOGUE_COUNT
+
+ set test "run"
+ gdb_test_multiple "python SkipPrologue\($SKIP_PROLOGUE_COUNT\).run()" $test {
+ -re "Breakpoint $decimal at \[^\n\]*\n" {
+ # GDB prints some messages on breakpoint creation.
+ # Consume the output to avoid internal buffer full.
+ exp_continue
+ }
+ -re ".*$gdb_prompt $" {
+ pass $test
+ }
+ }
+}
diff --git a/gdb/testsuite/gdb.perf/skip-prologue.py b/gdb/testsuite/gdb.perf/skip-prologue.py
new file mode 100644
index 0000000..a1c5e11
--- /dev/null
+++ b/gdb/testsuite/gdb.perf/skip-prologue.py
@@ -0,0 +1,40 @@
+# Copyright (C) 2013 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+# This test case is to test the speed of GDB when it is analyzing the
+# function prologue.
+
+from perftest import perftest
+
+class SkipPrologue(perftest.TestCaseWithBasicMeasurements):
+ def __init__(self, count):
+ super(SkipPrologue, self).__init__("skip-prologue")
+ self.count = count
+
+ def _test(self):
+ for i in range(1, self.count):
+ # Insert breakpoints on function f1 and f2.
+ bp1 = gdb.Breakpoint("f1")
+ bp2 = gdb.Breakpoint("f2")
+ # Remove them.
+ bp1.delete()
+ bp2.delete()
+
+ def warm_up(self):
+ self._test()
+
+ def execute_test(self):
+ for i in range(1, 4):
+ self.measure.measure(self._test, i)
--
1.7.7.6