New test case gdb.base/branch-to-self.exp

gdb/testsuite:

2016-04-25  Yao Qi  <yao.qi@linaro.org>

	* gdb.base/branch-to-self.c: New file.
	* gdb.base/branch-to-self.exp: New file.

gdb/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2016-04-25  Yao Qi  <yao.qi@linaro.org>
+
+	* gdb.base/branch-to-self.c: New file.
+	* gdb.base/branch-to-self.exp: New file.
+
 2016-04-22  Yao Qi  <yao.qi@linaro.org>
 
 	* gdb.trace/unavailable.exp (gdb_collect_globals_test_1): Match

gdb/testsuite/gdb.base/branch-to-self.c

@@ -0,0 +1,40 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2016 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/>.  */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <signal.h>
+
+volatile int counter = 0;
+
+static void
+handler (int sig)
+{
+  counter = 5;
+}
+
+int
+main (void)
+{
+  signal (SIGALRM, handler);
+  alarm (5);
+
+  /* Compiler may generate a single instruction which branches to
+     itself.  */
+  for (;;); /* loop-line */
+  return 0;
+}

gdb/testsuite/gdb.base/branch-to-self.exp

@@ -0,0 +1,69 @@
+# This testcase is part of GDB, the GNU debugger.
+#
+# Copyright 2016 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
+
+if { [build_executable ${testfile}.exp ${testfile} $srcfile {debug}] == -1 } {
+    return -1
+}
+
+with_test_prefix "single-step" {
+    global testfile
+
+    clean_restart ${testfile}
+    if ![runto_main] {
+	return -1
+    }
+    set line_num [gdb_get_line_number "loop-line" ${testfile}.c]
+
+    gdb_test "break ${testfile}.c:${line_num}" "Breakpoint .*" \
+	"set breakpoint"
+    gdb_continue_to_breakpoint "hit breakpoint"
+    gdb_test "si" ".*${testfile}.c:${line_num}.*"
+}
+
+with_test_prefix "break-cond" {
+    global testfile
+
+    foreach_with_prefix side {"host" "target"} {
+
+	clean_restart ${testfile}
+
+	if ![runto_main] {
+	    return -1
+	}
+
+	set test "set breakpoint condition-evaluation $side"
+	gdb_test_multiple $test $test {
+	    -re "warning: Target does not support breakpoint condition evaluation.\r\nUsing host evaluation mode instead.\r\n$gdb_prompt $" {
+		# Target doesn't support breakpoint condition
+		# evaluation on its side.  Skip the test.
+		continue
+	    }
+	    -re "^$test\r\n$gdb_prompt $" {
+	    }
+	}
+
+	set line_num [gdb_get_line_number "loop-line" ${testfile}.c]
+	gdb_test "break ${testfile}.c:${line_num} if counter > 3" \
+	    "Breakpoint .*" "set breakpoint with condition"
+
+	gdb_continue_to_breakpoint "continue to break"
+
+	gdb_test "p counter" ".* = 5"
+    }
+}