[PATCH v2 19/24] Add multi-target tests

Pedro Alves
2019-10-17T22:50:55Z

This adds a testcase exercising multi-target features. It spawns 6
inferiors, like this:

inferior 1 -> native
inferior 2 -> extended-remote 1
inferior 3 -> core
inferior 4 -> native
inferior 5 -> extended-remote 2
inferior 6 -> core

and then tests various details, including:

- running to breakpoints

- interrupting with Ctrl-C and "interrupt -a"

- "next" bouncing between two breakpoints in two threads running in
different targets.

- since we have cores and live inferiors mixed in the same session,
this makes sure that gdb doesn't try to remove a core dump's
threads.

- all-stop and non-stop modes.

This testcase caught a _lot_ of bugs in development.

gdb/testsuite/ChangeLog:
yyyy-mm-dd Pedro Alves <palves@redhat.com>

* gdb.multi/multi-target.c: New file.
* gdb.multi/multi-target.exp: New file.
* lib/gdbserver-support.exp (gdb_target_cmd): Handle "Non-stop
mode requested, but remote does not support non-stop".
---
gdb/testsuite/gdb.multi/multi-target.c | 100 +++++++++
gdb/testsuite/gdb.multi/multi-target.exp | 361 +++++++++++++++++++++++++++++++
gdb/testsuite/lib/gdbserver-support.exp | 4 +
3 files changed, 465 insertions(+)
create mode 100644 gdb/testsuite/gdb.multi/multi-target.c
create mode 100644 gdb/testsuite/gdb.multi/multi-target.exp

diff --git a/gdb/testsuite/gdb.multi/multi-target.c b/gdb/testsuite/gdb.multi/multi-target.c
new file mode 100644
index 0000000000..856226e6b9
--- /dev/null
+++ b/gdb/testsuite/gdb.multi/multi-target.c
@@ -0,0 +1,100 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2017-2019 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/>. */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <limits.h>
+#include <string.h>
+#include <pthread.h>
+
+#define NUM_THREADS 1
+
+static pthread_barrier_t barrier;
+
+static void *
+thread_start (void *arg)
+{
+ pthread_barrier_wait (&barrier);
+
+ while (1)
+ sleep (1);
+ return NULL;
+}
+
+static void
+all_started (void)
+{
+}
+
+int wait_for_gdb;
+
+static void
+function1 (void)
+{
+ while (wait_for_gdb)
+ sleep (1);
+}
+
+static void
+function2 (void)
+{
+ while (wait_for_gdb)
+ sleep (1);
+}
+
+static void
+function3 (void)
+{
+}
+
+static void
+function4 (void)
+{
+}
+
+static void
+function5 (void)
+{
+}
+
+int
+main (int argc, char ** argv)
+{
+ pthread_t thread;
+ int len;
+
+ alarm (360);
+
+ pthread_barrier_init (&barrier, NULL, NUM_THREADS + 1);
+ pthread_create (&thread, NULL, thread_start, NULL);
+
+ pthread_barrier_wait (&barrier);
+ all_started ();
+
+ while (1)
+ {
+ function1 (); /* set break 1 here */
+ function2 (); /* set break 2 here */
+ function3 ();
+ function4 ();
+ function5 ();
+ sleep (1);
+ }
+
+ return 0;
+}
diff --git a/gdb/testsuite/gdb.multi/multi-target.exp b/gdb/testsuite/gdb.multi/multi-target.exp
new file mode 100644
index 0000000000..3b71e7446b
--- /dev/null
+++ b/gdb/testsuite/gdb.multi/multi-target.exp
@@ -0,0 +1,361 @@
+# Copyright 2017-2019 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/>.
+
+# Test multi-target features.
+
+load_lib gdbserver-support.exp
+
+standard_testfile
+
+# The plain remote target can't do multiple inferiors.
+if {[target_info gdb_protocol] != ""} {
+ return
+}
+
+if { [prepare_for_testing "failed to prepare" ${binfile} "${srcfile}" \
+ {debug pthreads}] } {
+ return
+}
+
+proc connect_target_extended_remote {binfile} {
+ set res [gdbserver_start "--multi" ""]
+ set gdbserver_gdbport [lindex $res 1]
+ return [gdb_target_cmd "extended-remote" $gdbserver_gdbport]
+}
+
+# Add and start inferior number NUM. Returns true on success, false
+# otherwise.
+proc add_inferior {num target binfile {gcorefile ""}} {
+ # Start another inferior.
+ gdb_test "add-inferior -no-connection" "Added inferior $num" \
+ "add empty inferior $num"
+ gdb_test "inferior $num" "Switching to inferior $num.*" \
+ "switch to inferior $num"
+ gdb_test "file ${binfile}" ".*" "load file in inferior $num"
+ gdb_test_no_output "set remote exec-file ${binfile}" \
+ "set remote-exec file in inferior $num"
+
+ if {$target == "core"} {
+ gdb_test "core $gcorefile" "Core was generated by.*" \
+ "core [file tail $gcorefile]"
+ return 1
+ }
+
+ if {$target == "extended-remote"} {
+ if {[connect_target_extended_remote $binfile]} {
+ return 0
+ }
+ }
+ if ![runto "all_started"] then {
+ return 0
+ }
+ delete_breakpoints
+
+ return 1
+}
+
+proc prepare_core {} {
+ global gcorefile gcore_created
+ global binfile
+
+ clean_restart ${binfile}
+
+ if ![runto all_started] then {
+ return -1
+ }
+
+ global testfile
+ set gcorefile [standard_output_file $testfile.gcore]
+ set gcore_created [gdb_gcore_cmd $gcorefile "save a core file"]
+}
+
+proc next_live_inferior {inf} {
+ incr inf
+ if {$inf == 3} {
+ # 3 is a core.
+ return 4
+ }
+ if {$inf > 5} {
+ # 6 is a core.
+ return 1
+ }
+
+ return $inf
+}
+
+# Return true on success, false otherwise.
+
+proc setup {non-stop} {
+ global gcorefile gcore_created
+ global binfile
+
+ clean_restart ${binfile}
+
+ # multi-target depends on target running in non-stop mode. Force
+ # it on for remote targets, until this is the default.
+ gdb_test_no_output "maint set target-non-stop on"
+
+ gdb_test_no_output "set non-stop ${non-stop}"
+
+ if ![runto all_started] then {
+ return 0
+ }
+
+ delete_breakpoints
+
+ # inferior 1 -> native
+ # inferior 2 -> extended-remote
+ # inferior 3 -> core
+ # inferior 4 -> native
+ # inferior 5 -> extended-remote
+ # inferior 6 -> core
+ if {![add_inferior 2 "extended-remote" $binfile]} {
+ return 0
+ }
+ if {![add_inferior 3 "core" $binfile $gcorefile]} {
+ return 0
+ }
+ if {![add_inferior 4 "native" $binfile]} {
+ return 0
+ }
+ if {![add_inferior 5 "extended-remote" $binfile]} {
+ return 0
+ }
+ if {![add_inferior 6 "core" $binfile $gcorefile]} {
+ return 0
+ }
+
+ # For debugging.
+ gdb_test "info inferiors" ".*"
+ gdb_test "info threads" ".*"
+
+ # Make "continue" resume all inferiors.
+ if {${non-stop} == "off"} {
+ gdb_test_no_output "set schedule-multiple on"
+ }
+
+ return 1
+}
+
+# Test "continue" to breakpoints in different targets. In non-stop
+# mode, also tests "interrupt -a".
+proc test_continue {non-stop} {
+ if {![setup ${non-stop}]} {
+ untested "setup failed"
+ return
+ }
+
+ proc set_break {inf} {
+ gdb_test "break function${inf} thread ${inf}.1" \
+ "Breakpoint .* function${inf}\\..*"
+ }
+
+ # Select inferior INF, and then run to a breakpoint on inferior
+ # INF+1.
+ proc test_continue_inf {inf} {
+ upvar 1 non-stop non-stop
+
+ global gdb_prompt
+ delete_breakpoints
+
+ set next_inf [next_live_inferior $inf]
+
+ gdb_test "inferior $inf" "Switching to inferior $inf.*"
+ set_break $next_inf
+
+ if {${non-stop} == "off"} {
+ gdb_test "continue" "hit Breakpoint .* function${next_inf}.*"
+ } else {
+ set msg "continue"
+ gdb_test_multiple "continue -a&" $msg {
+ -re "Continuing.*$gdb_prompt " {
+ pass $msg
+ }
+ }
+
+ set msg "hit bp"
+ gdb_test_multiple "" $msg {
+ -re "hit Breakpoint .* function${next_inf}" {
+ pass $msg
+ }
+ }
+
+ set msg "stop all threads"
+ gdb_test_multiple "interrupt -a" $msg {
+ -re "$gdb_prompt " {
+ for {set i 0} {$i < 7} {incr i} {
+ set ok 0
+ gdb_test_multiple "" $msg {
+ -re "Thread\[^\r\n\]*stopped\\." {
+ set ok 1
+ }
+ }
+ if {!$ok} {
+ break
+ }
+ }
+ gdb_assert $ok $msg
+ }
+ }
+ }
+ }
+
+ for {set i 1} {$i <= 5} {incr i} {
+ if {$i == 3} {
+ # This is a core inferior.
+ continue
+ }
+
+ with_test_prefix "inf$i" {
+ test_continue_inf $i
+ }
+ }
+}
+
+# Test interrupting multiple targets with Ctrl-C.
+
+proc test_ctrlc {} {
+ if {![setup "off"]} {
+ untested "setup failed"
+ return
+ }
+
+ delete_breakpoints
+
+ # Select inferior INF, continue all inferiors, and then Ctrl-C.
+ proc test_ctrlc_inf {inf} {
+ global gdb_prompt
+
+ gdb_test "inferior $inf" "Switching to inferior $inf.*"
+
+ set msg "continue"
+ gdb_test_multiple "continue" $msg {
+ -re "Continuing" {
+ pass $msg
+ }
+ }
+
+ after 200 { send_gdb "\003" }
+
+ set msg "send_gdb control C"
+ gdb_test_multiple "" $msg {
+ -re "received signal SIGINT.*$gdb_prompt $" {
+ pass $msg
+ }
+ }
+
+ set msg "all threads stopped"
+ gdb_test_multiple "info threads" "$msg" {
+ -re "\\\(running\\\).*$gdb_prompt $" {
+ fail $msg
+ }
+ -re "$gdb_prompt $" {
+ pass $msg
+ }
+ }
+ }
+
+ for {set i 1} {$i <= 5} {incr i} {
+ if {$i == 3} {
+ # This is a core inferior.
+ continue
+ }
+
+ with_test_prefix "inf$i" {
+ test_ctrlc_inf $i
+ }
+ }
+}
+
+# Test "next" bouncing between two breakpoints in two threads running
+# in different targets.
+proc test_ping_pong_next {} {
+ global srcfile
+
+ if {![setup "off"]} {
+ untested "setup failed"
+ return
+ }
+
+ # block/unblock inferiors 1 and 2 according to INF1 and INF2.
+ proc block {inf1 inf2} {
+ gdb_test "thread apply 1.1 p wait_for_gdb = $inf1" " = $inf1"
+ gdb_test "thread apply 2.1 p wait_for_gdb = $inf2" " = $inf2"
+ }
+
+ # We're use inferiors 1 and 2. Make sure they're really connected
+ # to different targets.
+ gdb_test "thread apply 1.1 maint print target-stack" \
+ "- native.*"
+ gdb_test "thread apply 2.1 maint print target-stack" \
+ "- extended-remote.*"
+
+ # Set two breakpoints, one for each of inferior 1 and 2. Inferior
+ # 1 is running on the native target, and inferior 2 is running on
+ # extended-gdbserver. Run to breakpoint 1 to gets things started.
+ set line1 [gdb_get_line_number "set break 1 here"]
+ set line2 [gdb_get_line_number "set break 2 here"]
+
+ gdb_test "thread 1.1" "Switching to thread 1.1 .*"
+
+ gdb_test "break $srcfile:$line1 thread 1.1" \
+ "Breakpoint .*$srcfile:$line1\\..*"
+
+ gdb_test "continue" "hit Breakpoint .*"
+
+ gdb_test "break $srcfile:$line2 thread 2.1" \
+ "Breakpoint .*$srcfile:$line2\\..*"
+
+ # Now block inferior 1 and issue "next". We should stop at the
+ # breakpoint for inferior 2, given schedlock off.
+ with_test_prefix "next inf 1" {
+ block 1 0
+ gdb_test "next" "Thread 2.1 .*hit Breakpoint .*$srcfile:$line2.*"
+ }
+
+ # Now unblock inferior 2 and block inferior 1. "next" should run
+ # into the breakpoint in inferior 1.
+ with_test_prefix "next inf 2" {
+ block 0 1
+ gdb_test "next" "Thread 1.1 .*hit Breakpoint .*$srcfile:$line1.*"
+ }
+
+ # Try nexting inferior 1 again.
+ with_test_prefix "next inf 1 again" {
+ block 1 0
+ gdb_test "next" "Thread 2.1 .*hit Breakpoint .*$srcfile:$line2.*"
+ }
+}
+
+# Make a core file with two threads upfront. Several tests load the
+# same core file.
+prepare_core
+
+# Some basic "continue" + breakpoints tests.
+with_test_prefix "continue" {
+ foreach_with_prefix non-stop {"off" "on"} {
+ test_continue ${non-stop}
+ }
+}
+
+# Some basic all-stop Ctrl-C tests.
+with_test_prefix "interrupt" {
+ test_ctrlc
+}
+
+# Test ping-ponging between two targets with "next".
+with_test_prefix "ping-pong" {
+ test_ping_pong_next
+}
diff --git a/gdb/testsuite/lib/gdbserver-support.exp b/gdb/testsuite/lib/gdbserver-support.exp
index 00f46c8264..a5d88ec314 100644
--- a/gdb/testsuite/lib/gdbserver-support.exp
+++ b/gdb/testsuite/lib/gdbserver-support.exp
@@ -64,6 +64,10 @@ proc gdb_target_cmd_ext { targetname serialport {additional_text ""} } {
-re "Couldn't establish connection to remote.*$gdb_prompt $" {
verbose "Connection failed"
}
+ -re "Non-stop mode requested, but remote does not support non-stop.*$gdb_prompt $" {
+ verbose "remote does not support non-stop"
+ return 1
+ }
-re "Remote MIPS debugging.*$additional_text.*$gdb_prompt" {
verbose "Set target to $targetname"
return 0
--
2.14.5