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, 1 insertions, 49 deletions

diff --git a/gdb/gdbarch-selftests.c b/gdb/gdbarch-selftests.c
index c748fcc6606..49d006f2dc8 100644
--- a/gdb/gdbarch-selftests.c
+++ b/gdb/gdbarch-selftests.c
@@ -25,58 +25,10 @@
 #include "gdbthread.h"
 #include "target.h"
 #include "target-float.h"
+#include "common/def-vector.h"
 
 namespace selftests {
 
-/* A mock process_stratum target_ops that doesn't read/write registers
-   anywhere.  */
-
-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)
-{
-}
-
-class test_target_ops : public target_ops
-{
-public:
-  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);
-  }
-};
-
 /* Test gdbarch methods register_to_value and value_to_register.  */
 
 static void