[PATCH 6/6] gdb.trace: Add a testcase for tdesc in tfile.

["Marcin Kościelnicki" <koriakin@0x04.net>]

This tests whether $ymm15 can be correctly collected and printed from
tfile.  It covers:

- storing tdesc in tfile (without that, $ymm15 doesn't exist)
- ax_pseudo_register_collect for x86 (without that, $ymm15 cannot be
  collected)
- register order in tfile_fetch_registers (without that, $ymm15h is
  fetched from wrong position)
- off-by-one in tfile_fetch_registers (without that, $ymm15h is
  incorrectly considered to be out of bounds)
- using proper tdesc in encoding tracepoint actions (without that,
  internal error happens due to $ymm15h being considered unavailable)

gdb/testsuite/ChangeLog:

	* gdb.trace/tfile-avx.c: New test.
	* gdb.trace/tfile-avx.exp: New test.
---
This test requires https://sourceware.org/ml/gdb-patches/2016-01/msg00115.html
and all the previous 5 patches in this series.

 gdb/testsuite/ChangeLog               |  5 +++
 gdb/testsuite/gdb.trace/tfile-avx.c   | 48 ++++++++++++++++++++
 gdb/testsuite/gdb.trace/tfile-avx.exp | 82 +++++++++++++++++++++++++++++++++++
 3 files changed, 135 insertions(+)
 create mode 100644 gdb/testsuite/gdb.trace/tfile-avx.c
 create mode 100644 gdb/testsuite/gdb.trace/tfile-avx.exp

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 046f112..c9a596c 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2016-02-06  Marcin Kościelnicki  <koriakin@0x04.net>
+
+	* gdb.trace/tfile-avx.c: New test.
+	* gdb.trace/tfile-avx.exp: New test.
+
 2016-02-04  Yao Qi  <yao.qi@linaro.org>
 
 	* gdb.base/foll-exec-mode.c: Include limits.h.
diff --git a/gdb/testsuite/gdb.trace/tfile-avx.c b/gdb/testsuite/gdb.trace/tfile-avx.c
new file mode 100644
index 0000000..71107b8
--- /dev/null
+++ b/gdb/testsuite/gdb.trace/tfile-avx.c
@@ -0,0 +1,48 @@
+/* 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/>.  */
+
+/*
+ * Test program for reading target description from tfile: collects AVX
+ * registers on x86_64.
+ */
+
+#include <immintrin.h>
+
+void
+dummy (void)
+{}
+
+static void
+end (void)
+{}
+
+int main (void)
+{
+  register __v8si a asm("ymm15") = {
+    0x12340001,
+    0x12340002,
+    0x12340003,
+    0x12340004,
+    0x12340005,
+    0x12340006,
+    0x12340007,
+    0x12340008,
+  };
+  asm volatile ("traceme: call dummy" : : "x" (a));
+  end ();
+  return 0;
+}
diff --git a/gdb/testsuite/gdb.trace/tfile-avx.exp b/gdb/testsuite/gdb.trace/tfile-avx.exp
new file mode 100644
index 0000000..1acf4cb
--- /dev/null
+++ b/gdb/testsuite/gdb.trace/tfile-avx.exp
@@ -0,0 +1,82 @@
+# 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/>.
+
+if { ! [istarget "x86_64*-*-*linux*"] } {
+    verbose "Skipping tfile AVX test (target is not x86_64 linux)."
+    return
+}
+
+load_lib "trace-support.exp"
+
+standard_testfile
+
+if {[prepare_for_testing $testfile.exp $testfile $srcfile \
+     [list debug nowarnings additional_flags=-mavx]]} {
+    return -1
+}
+
+if ![runto_main] {
+    fail "Can't run to main to check for trace support"
+    return -1
+}
+
+if ![gdb_target_supports_trace] {
+    unsupported "target does not support trace"
+    return -1
+}
+
+send_gdb "print \$ymm15\n"
+gdb_expect {
+    -re "\\$\[0-9\]+ = void.*$gdb_prompt \$" {
+	verbose "Skipping tfile AVX test (target doesn't support AVX)."
+	return
+    }
+    -re "\\$\[0-9\]+ = \\{.*}.*$gdb_prompt \$" {
+	# All is well.
+    }
+}
+
+gdb_test "trace traceme" ".*"
+
+gdb_trace_setactions "set actions for tracepoint" "" \
+	"collect \$ymm15" "^$"
+
+gdb_breakpoint "end"
+
+gdb_test_no_output "tstart"
+
+gdb_test "continue" ".*Breakpoint \[0-9\]+, end .*"
+
+set tracefile [standard_output_file ${testfile}]
+
+# Save trace frames to tfile.
+gdb_test "tsave ${tracefile}.tf" \
+    "Trace data saved to file '${tracefile}.tf'.*" \
+    "save tfile trace file"
+
+# Change target to tfile.
+set test "change to tfile target"
+gdb_test_multiple "target tfile ${tracefile}.tf" "$test" {
+    -re "A program is being debugged already.  Kill it. .y or n. " {
+	send_gdb "y\n"
+	exp_continue
+    }
+    -re "$gdb_prompt $" {
+	pass "$test"
+    }
+}
+
+gdb_test "tfind 0" "Found trace frame 0, tracepoint .*"
+
+gdb_test "print/x \$ymm15.v8_int32" "\\$\[0-9\]+ = \\{0x12340001, .*, 0x12340008}.*"
-- 
2.7.0