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authorSimon Marchi <simon.marchi@efficios.com>2019-04-09 12:32:26 -0400
committerSimon Marchi <simon.marchi@efficios.com>2019-04-09 12:32:26 -0400
commite242fd1249ae85a97f08f95d5c61f4cbe3b906e0 (patch)
tree79a3a53a561e442ee6dec6277b524292ddbe57bc /gdb
parent7e96e219a4fc703282ea5b0cc8845a96c01ca030 (diff)
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Use -qualified flag when setting temporary breakpoint in start command
When using the "start" command, GDB puts a temporary breakpoint on the "main" symbol (we literally invoke the tbreak command). However, since it does wild matching by default, it also puts a breakpoint on any C++ method or "main" function in a namespace. For example, when debugging GDB, it creates a total of 24 locations: (gdb) start Temporary breakpoint 1 at 0x198c1e9: main. (24 locations) as there are a bunch of methods called main in the selftests, such as selftests::string_view::capacity_1::main() If such method was called in the constructor of a global object, or a function marked with the attribute "constructor", then we would stop at the wrong place. Also, this causes a few extra symtabs (those that contain the "wrong" mains) to be expanded for nothing. The dummiest, most straightforward solution is to add -qualified when invoking tbreak. With this patch, "start" creates a single-location breakpoint, as expected. I copied the start.exp test to start-cpp.exp and made it use a C++ test file, which contains two main functions. The new test verifies that the output of "start" is the output we get when we set a single-location breakpoint. gdb/ChangeLog: * infcmd.c (run_command_1): Pass -qualified to tbreak when usind the "start" command. gdb/testsuite/ChangeLog: * gdb.base/start-cpp.exp: New file. * gdb.base/start-cpp.cc: New file.
Diffstat (limited to 'gdb')
-rw-r--r--gdb/ChangeLog5
-rw-r--r--gdb/infcmd.c5
-rw-r--r--gdb/testsuite/ChangeLog5
-rw-r--r--gdb/testsuite/gdb.base/start-cpp.cc33
-rw-r--r--gdb/testsuite/gdb.base/start-cpp.exp37
5 files changed, 84 insertions, 1 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index e1d20fd..7af9b90 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2019-04-09 Simon Marchi <simon.marchi@efficios.com>
+
+ * infcmd.c (run_command_1): Pass -qualified to tbreak when usind
+ the "start" command.
+
2019-04-08 Kevin Buettner <kevinb@redhat.com>
* python/py-inferior.c (infpy_thread_from_thread_handle):
diff --git a/gdb/infcmd.c b/gdb/infcmd.c
index 3b26fd4..178f89e 100644
--- a/gdb/infcmd.c
+++ b/gdb/infcmd.c
@@ -604,7 +604,10 @@ run_command_1 (const char *args, int from_tty, enum run_how run_how)
/* Insert temporary breakpoint in main function if requested. */
if (run_how == RUN_STOP_AT_MAIN)
- tbreak_command (main_name (), 0);
+ {
+ std::string arg = string_printf ("-qualified %s", main_name ());
+ tbreak_command (arg.c_str (), 0);
+ }
exec_file = get_exec_file (0);
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 5f1ce3c..5c7cadf 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2019-04-09 Simon Marchi <simon.marchi@efficios.com>
+
+ * gdb.base/start-cpp.exp: New file.
+ * gdb.base/start-cpp.cc: New file.
+
2019-04-08 Kevin Buettner <kevinb@redhat.com>
* gdb.python/py-thrhandle.exp: Adjust tests to call
diff --git a/gdb/testsuite/gdb.base/start-cpp.cc b/gdb/testsuite/gdb.base/start-cpp.cc
new file mode 100644
index 0000000..1d0fd7d
--- /dev/null
+++ b/gdb/testsuite/gdb.base/start-cpp.cc
@@ -0,0 +1,33 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2019 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/>. */
+
+namespace foo
+{
+
+int
+main ()
+{
+ return 1;
+}
+
+} /* namespace foo */
+
+int
+main ()
+{
+ return foo::main ();
+}
diff --git a/gdb/testsuite/gdb.base/start-cpp.exp b/gdb/testsuite/gdb.base/start-cpp.exp
new file mode 100644
index 0000000..5f98b92
--- /dev/null
+++ b/gdb/testsuite/gdb.base/start-cpp.exp
@@ -0,0 +1,37 @@
+# Copyright 2005-2019 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/>.
+
+standard_testfile .cc
+
+if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} {
+ return -1
+}
+
+# This is a testcase specifically for the `start' GDB command. For regular
+# stop-in-main goal in the testcases consider using `runto_main' instead.
+
+# In this C++ version of the test (as opposed to start.exp), we specifically
+# test that the temporary breakpoint created by the start command has a single
+# location, even if we have a function named "main" in a non-root namespace.
+
+# For C++ programs, "start" should stop in main().
+if { [gdb_start_cmd] < 0 } {
+ untested start
+ return -1
+}
+
+gdb_test "" \
+ "Temporary breakpoint $decimal at $hex: file.*main \\(\\) at .*start-cpp.cc:.*" \
+ "start"