PR17525 - breakpoint commands not executed when program run from -x script

Executing a gdb script that runs the inferior (from the command line
with -x), and has it hit breakpoints with breakpoint commands that
themselves run the target, is currently broken on async targets
(Linux, remote).

While we're executing a command list or a script, we force the
interpreter to be sync, which results in some functions nesting an
event loop and waiting for the target to stop, instead of returning
immediately and having the top level event loop handle the stop.

The issue with this bug is simply that bpstat_do_actions misses
checking whether the interpreter is sync.  When we get here, in the
case of executing a script (or, when the interpreter is sync), the
program has already advanced to the next breakpoint, through
maybe_wait_sync_command_done.  We need to process its breakpoints
immediately, just like with a sync target.

Tested on x86_64 Fedora 20.

gdb/
2015-01-14  Pedro Alves  <palves@redhat.com>

	PR gdb/17525
	* breakpoint.c: Include "interps.h".
	(bpstat_do_actions_1): Also check whether the interpreter is
	async.

gdb/testsuite/
2015-01-14  Pedro Alves  <palves@redhat.com>
	    Joel Brobecker  <brobecker@adacore.com>

	PR gdb/17525
	* gdb.base/bp-cmds-execution-x-script.c: New file.
	* gdb.base/bp-cmds-execution-x-script.exp: New file.
	* gdb.base/bp-cmds-execution-x-script.gdb: New file.

gdb/ChangeLog

@@ -1,3 +1,10 @@
+2015-01-14  Pedro Alves  <palves@redhat.com>
+
+	PR gdb/17525
+	* breakpoint.c: Include "interps.h".
+	(bpstat_do_actions_1): Also check whether the interpreter is
+	async.
+
 2015-01-14  Pedro Alves  <palves@redhat.com>
 
 	PR cli/17828

gdb/breakpoint.c

@@ -66,7 +66,7 @@
 #include "skip.h"
 #include "ax-gdb.h"
 #include "dummy-frame.h"
-
+#include "interps.h"
 #include "format.h"
 
 /* readline include files */
@@ -4635,7 +4635,7 @@ bpstat_do_actions_1 (bpstat *bsp)
 
       if (breakpoint_proceeded)
 	{
-	  if (target_can_async_p ())
+	  if (interpreter_async && target_can_async_p ())
 	    /* If we are in async mode, then the target might be still
 	       running, not stopped at any breakpoint, so nothing for
 	       us to do here -- just return to the event loop.  */

gdb/testsuite/ChangeLog

@@ -1,3 +1,11 @@
+2015-01-14  Pedro Alves  <palves@redhat.com>
+	    Joel Brobecker  <brobecker@adacore.com>
+
+	PR gdb/17525
+	* gdb.base/bp-cmds-execution-x-script.c: New file.
+	* gdb.base/bp-cmds-execution-x-script.exp: New file.
+	* gdb.base/bp-cmds-execution-x-script.gdb: New file.
+
 2015-01-14  Pedro Alves  <palves@redhat.com>
 
 	PR cli/17828

gdb/testsuite/gdb.base/bp-cmds-execution-x-script.c

@@ -0,0 +1,35 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2015 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/>.  */
+
+int
+increment (int i)
+{
+  return i + 1;
+}
+
+#define N_INCR 20
+
+int
+main (void)
+{
+  int val = 1;
+  int j;
+
+  for (j = 0; j < N_INCR; j++)
+    val = increment (val);
+  return val == N_INCR;
+}

gdb/testsuite/gdb.base/bp-cmds-execution-x-script.exp

@@ -0,0 +1,75 @@
+# Copyright 2015 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/>.  */
+
+# Test that GDB isn't silent if it fails to remove a breakpoint from
+# the main program, independently of whether the program was loaded
+# with "file PROGRAM" or directly from the command line with "gdb
+# PROGRAM".
+
+# Test that execution commands in a GDB script file run through -x
+# work as expected.  Specifically, the scripts creates a breakpoint
+# that has "continue" in its command list, and then does "run".
+
+standard_testfile
+
+if {[build_executable "failed to prepare" $testfile $srcfile debug]} {
+    return -1
+}
+
+set x_file ${srcdir}/${subdir}/$testfile.gdb
+
+global GDBFLAGS
+set saved_gdbflags $GDBFLAGS
+
+# Run the test proper.
+
+proc test {} {
+    global inferior_exited_re
+    global binfile
+    global gdb_prompt
+    global saved_gdbflags GDBFLAGS
+    global x_file
+
+    gdb_exit
+
+    set GDBFLAGS "$GDBFLAGS -x $x_file $binfile"
+
+    set GDBFLAGS $saved_gdbflags
+    append GDBFLAGS " -ex \"set height unlimited\""
+    append GDBFLAGS " -x \"$x_file\""
+    append GDBFLAGS " --args \"$binfile\""
+
+    set test "run to end"
+
+    gdb_exit
+    set res [gdb_spawn]
+    if { $res != 0} {
+	fail $test
+	return -1
+    }
+
+    gdb_test_multiple "" $test {
+	-re "$inferior_exited_re normally.*$gdb_prompt $" {
+	    pass $test
+	}
+	-re "Don't know how to run.*$gdb_prompt $" {
+	    unsupported $test
+	}
+    }
+}
+
+test
+
+set GDBFLAGS $saved_gdbflags

gdb/testsuite/gdb.base/bp-cmds-execution-x-script.gdb

@@ -0,0 +1,20 @@
+# Copyright 2015 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/>.  */
+
+break increment
+commands
+   cont
+end
+run