regcache::cooked_read unit test

This patch adds a unit test to regcache::cooked_read.  This unit test is a
little different from normal unit test, it is more about conformance test
or interaction test.  This test pass both raw register number and pseudo
register number to regcache::cooked_read, in order to inspect 1) return
value of cooked_read, 2) how are target_ops to_xfer_partial,
to_{fetch,store}_registers called (because regcache is updated by means of
these three target_ops methods).  With this test here, we have a clear
picture about how each port of GDB get cooked registers.

This patch also shares some code on mock target.

gdb:

2017-11-24  Yao Qi  <yao.qi@linaro.org>

	* gdbarch-selftests.c (test_target_has_registers): Move it to
	target.c.
	(test_target_has_stack): Likewise.
	(test_target_has_memory): Likewise.
	(test_target_prepare_to_store): Likewise.
	(test_target_store_registers): Likewise.
	(test_target_ops): Likewise.
	* regcache.c: Include selftest-arch.h and gdbthread.h.
	(target_ops_no_register): New class.
	(test_target_fetch_registers): New.
	(test_target_store_registers): New.
	(test_target_xfer_partial): New.
	(readwrite_regcache): New.
	(cooked_read_test): New.
	(_initialize_regcache): Register the test.
	* target.c: (test_target_has_registers): Moved from
	gdbarch-selftests.c.
	(test_target_has_stack): Likewise.
	(test_target_has_memory): Likewise.
	(test_target_prepare_to_store): Likewise.
	(test_target_store_registers): Likewise.
	* target.h (test_target_ops): New class.

1 files changed, 47 insertions, 0 deletions

diff --git a/gdb/target.c b/gdb/target.c
index 2e02a77..3bfc8b5 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -4018,6 +4018,53 @@ set_write_memory_permission (const char *args, int from_tty,
   update_observer_mode ();
 }
 
+#if GDB_SELF_TEST
+namespace selftests {
+
+static int
+test_target_has_registers (target_ops *self)
+{
+  return 1;
+}
+
+static int
+test_target_has_stack (target_ops *self)
+{
+  return 1;
+}
+
+static int
+test_target_has_memory (target_ops *self)
+{
+  return 1;
+}
+
+static void
+test_target_prepare_to_store (target_ops *self, regcache *regs)
+{
+}
+
+static void
+test_target_store_registers (target_ops *self, regcache *regs, int regno)
+{
+}
+
+test_target_ops::test_target_ops ()
+  : target_ops {}
+{
+  to_magic = OPS_MAGIC;
+  to_stratum = process_stratum;
+  to_has_memory = test_target_has_memory;
+  to_has_stack = test_target_has_stack;
+  to_has_registers = test_target_has_registers;
+  to_prepare_to_store = test_target_prepare_to_store;
+  to_store_registers = test_target_store_registers;
+
+  complete_target_initialization (this);
+}
+
+} // namespace selftests
+#endif /* GDB_SELF_TEST */
 
 void
 initialize_targets (void)