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4 Commits

Author SHA1 Message Date
Pedro Alves
55b11ddf16 Redesign mock environment for gdbarch selftests 
A following patch will remove this hack from within regcache's
implementation:

  struct regcache *
  get_thread_arch_regcache (ptid_t ptid, struct gdbarch *gdbarch)
  {
    struct address_space *aspace;

    /* For the benefit of "maint print registers" & co when debugging an
       executable, allow dumping the regcache even when there is no
       thread selected (target_thread_address_space internal-errors if
       no address space is found).  Note that normal user commands will
       fail higher up on the call stack due to no
       target_has_registers.  */
    aspace = (ptid_equal (null_ptid, ptid)
	      ? NULL
	      : target_thread_address_space (ptid));

i.e., it'll no longer be possible to try to build a regcache for
null_ptid.  That change alone would regress the gdbarch self tests
though, causing this:

  (gdb) maintenance selftest
  [...]
  Running selftest register_to_value.
  src/gdb/inferior.c:309: internal-error: inferior* find_inferior_pid(int): Assertion `pid != 0' failed.
  A problem internal to GDB has been detected,
  further debugging may prove unreliable.
  Quit this debugging session? (y or n) FAIL: gdb.gdb/unittest.exp: maintenance selftest (GDB internal error)

The problem is that the way the mocking environment for those unit
tests is written is a bit fragile: it creates a special purpose
regcache (and sentinel's frame), using whatever is the current
inferior_ptid (usually null_ptid), and assumes get_current_regcache
will find that in the regcache::current_regcache list.

This commit changes the way the mock environment is created.  It
eliminates the special regcache and frame and instead creates a fuller
mock environment, with a custom mock target_ops, and then a mock
inferior and thread "running" on that target.

If there's already a running target when you type "maint selftest",
then we error out, instead of pushing a new target on top of the
existing one (and thus killing the debug session).  This results in:

  (gdb) maint selftest
  (...)
  Self test failed: arch i386: target already pushed
  Self test failed: arch i386:x86-64: target already pushed
  Self test failed: arch i386:x64-32: target already pushed
  Self test failed: arch i8086: target already pushed
  Self test failed: arch i386:intel: target already pushed
  Self test failed: arch i386:x86-64:intel: target already pushed
  Self test failed: arch i386:x64-32:intel: target already pushed
  Self test failed: arch i386:nacl: target already pushed
  Self test failed: arch i386:x86-64:nacl: target already pushed
  Self test failed: arch i386:x64-32:nacl: target already pushed
  Self test failed: self-test failed at /home/pedro/gdb/mygit/src/gdb/selftest-arch.c:86
  (...)
  Ran 19 unit tests, 1 failed

I think that's OK, because self tests are really meant to be run from
a clean state right after GDB is started.  I'm adding that erroring
out just as safe measure just in case someone types "maint selftest"
on the command line while already debugging something (as I've done
it).

(In my multi-target branch, where this patch originated from, we don't
actually need to error out, because there each inferior has its own
target stack).

Also, note that the current code was doing:

 current_inferior()->gdbarch = gdbarch;

without taking care to restore the previous gdbarch.  This means that
GDB's state was being left inconsistent after running the self tests,
further supporting the point that there's probably not much
expectation that mixing "maint selftests" and regular debugging in the
same GDB invocation really works.  This patch fixes that, regardless.

gdb/ChangeLog:
2017-10-04  Pedro Alves  <palves@redhat.com>

	* frame.c (create_test_frame): Delete.
	* frame.h (create_test_frame): Delete.
	* gdbarch-selftests.c: Include gdbthread.h and target.h.
	(class regcache_test): Delete.
	(test_target_has_registers, test_target_has_stack)
	(test_target_has_memory, test_target_prepare_to_store)
	(test_target_store_registers): New functions.
	(test_target_ops): New class.
	(register_to_value_test): Error out if there's already a
	process_stratum (or higher) target pushed.  Create a fuller mock
	environment, with mock target_ops, inferior, address space, thread
	and inferior_ptid.
	* progspace.c (struct address_space): Move to ...
	* progspace.h (struct address_space): ... here.
	* regcache.h (regcache::~regcache, regcache::raw_write)
	[GDB_SELF_TEST]: No longer virtual.
 2017-10-04 18:21:09 +01:00
Simon Marchi
1526853e34 Add selftests run filtering 
With the growing number of selftests, I think it would be useful to be
able to run only a subset of the tests.  This patch associates a name to
each registered selftest.  It then allows doing something like:

  (gdb) maintenance selftest aarch64
  Running self-tests.
  Running selftest aarch64-analyze-prologue.
  Running selftest aarch64-process-record.
  Ran 2 unit tests, 0 failed

or with gdbserver:

  ./gdbserver --selftest=aarch64

In both cases, only the tests that contain "aarch64" in their name are
ran.  To help validate that the tests you want to run were actually ran,
it also prints a message with the test name before running each test.

Right now, all the arch-dependent tests are registered as a single test
of the selftests.  To be able to filter those too, I made them
"first-class citizen" selftests.  The selftest type is an interface,
with different implementations for "simple selftests" and "arch
selftests".  The run_tests function simply iterates on that an invokes
operator() on each test.

I changed the tests data structure from a vector to a map, because

  - it allows iterating in a stable (alphabetical) order
  - it allows to easily verify if a test with a given name has been
    registered, to avoid duplicates

There's also a new command "maintenance info selftests" that lists the
registered selftests.

gdb/ChangeLog:

	* common/selftest.h (selftest): New struct/interface.
	(register_test): Add name parameter, add new overload.
	(run_tests): Add filter parameter.
	(for_each_selftest_ftype): New typedef.
	(for_each_selftest): New declaration.
	* common/selftest.c (tests): Change type to
	map<string, unique_ptr<selftest>>.
	(simple_selftest): New struct.
	(register_test): New function.
	(register_test): Add name parameter and use it.
	(run_tests): Add filter parameter and use it.  Add prints.
	Adjust to vector -> map change.
	* aarch64-tdep.c (_initialize_aarch64_tdep): Add names when
	registering selftests.
	* arm-tdep.c (_initialize_arm_tdep): Likewise.
	* disasm-selftests.c (_initialize_disasm_selftests): Likewise.
	* dwarf2-frame.c (_initialize_dwarf2_frame): Likewise.
	* dwarf2loc.c (_initialize_dwarf2loc): Likewise.
	* findvar.c (_initialize_findvar): Likewise.
	* gdbarch-selftests.c (_initialize_gdbarch_selftests): Likewise.
	* maint.c (maintenance_selftest): Update call to run_tests.
	(maintenance_info_selftests): New function.
	(_initialize_maint_cmds): Register "maintenance info selftests"
	command.  Update "maintenance selftest" doc.
	* regcache.c (_initialize_regcache): Add names when registering
	selftests.
	* rust-exp.y (_initialize_rust_exp): Likewise.
	* selftest-arch.c (gdbarch_selftest): New struct.
	(gdbarch_tests): Remove.
	(register_test_foreach_arch): Add name parameter.  Call
	register_test.
	(tests_with_arch): Remove, move most content to
	gdbarch_selftest::operator().
	(_initialize_selftests_foreach_arch): Remove.
	* selftest-arch.h (register_test_foreach_arch): Add name
	parameter.
	(run_tests_with_arch): New declaration.
	* utils-selftests.c (_initialize_utils_selftests): Add names
	when registering selftests.
	* utils.c (_initialize_utils): Likewise.
	* unittests/array-view-selftests.c
	(_initialize_array_view_selftests): Likewise.
	* unittests/environ-selftests.c (_initialize_environ_selftests):
	Likewise.
	* unittests/function-view-selftests.c
	(_initialize_function_view_selftests): Likewise.
	* unittests/offset-type-selftests.c
	(_initialize_offset_type_selftests): Likewise.
	* unittests/optional-selftests.c
	(_initialize_optional_selftests): Likewise.
	* unittests/scoped_restore-selftests.c
	(_initialize_scoped_restore_selftests): Likewise.
	* NEWS: Document "maintenance selftest" and "maint info
	selftests".

gdb/gdbserver/ChangeLog:

	* server.c (captured_main): Accept argument for --selftest.
	Update run_tests call.
	* linux-x86-tdesc-selftest.c (initialize_low_tdesc): Add names
	when registering selftests.

gdb/doc/ChangeLog:

	* gdb.texinfo (Maintenance Commands): Document filter parameter
	of "maint selftest".  Document "maint info selftests" command.
 2017-09-16 14:06:03 +02:00
Yao Qi
7649770c8e Put selftests api into selftests namespace 
This patch changes register_self_test to selftests::register_test,
and run_self_tests to selftest::run_tests.

gdb:

2017-08-18  Yao Qi  <yao.qi@linaro.org>

	* selftest.c (register_self_test): Rename it to
	selftests::register_test.
	(run_self_tests): selftest::run_tests.
	* selftest.h: Update declarations.
	* selftest-arch.c (register_self_test_foreach_arch): Rename it to
	selftests::register_test_foreach_arch.
	* selftest-arch.h: Update declaration.
	* aarch64-tdep.c: Update.
	* arm-tdep.c: Likewise.
	* disasm-selftests.c: Likewise.
	* dwarf2loc.c: Likewise.
	* dwarf2-frame.c: Likewise.
	* findvar.c: Likewise.
	* gdbarch-selftests.c: Likewise.
	* maint.c (maintenance_selftest): Likewise.
	* regcache.c: Likewise.
	* rust-exp.y: Likewise.
	* selftest-arch.c: Likewise.
	* unittests/environ-selftests.c: Likewise.
	* unittests/function-view-selftests.c: Likewise.
	* unittests/offset-type-selftests.c: Likewise.
	* unittests/optional-selftests.c: Likewise.
	* unittests/scoped_restore-selftests.c: Likewise.
	* utils-selftests.c: Likewise.
 2017-08-18 09:20:43 +01:00
Yao Qi
b77b02a5ca Add unit test to gdbarch methods register_to_value and value_to_register 
This patch adds one unit test for gdbarch methods register_to_value and
value_to_register.  The test pass different combinations of {regnu, type}
to gdbarch_register_to_value and gdbarch_value_to_register.  In order
to do the test, add a new function create_new_frame to create a fake
frame.  It can be improved after we converted frame_info to class.

In order to isolate regcache (from target_ops operations on writing
registers, like target_store_registers), the sub-class of regcache in the
test override raw_write.  Also, in order to get the right regcache from
get_thread_arch_aspace_regcache, the sub-class of regcache inserts itself
to current_regcache.

Suppose I incorrectly modified the size of buffer as below,

@@ -1228,7 +1228,7 @@ ia64_register_to_value (struct frame_info *frame, int regnum,
                        int *optimizedp, int *unavailablep)
 {
   struct gdbarch *gdbarch = get_frame_arch (frame);
-  gdb_byte in[MAX_REGISTER_SIZE];
+  gdb_byte in[1];

   /* Convert to TYPE.  */
   if (!get_frame_register_bytes (frame, regnum, 0,

build GDB with "-fsanitize=address" and run unittest.exp, asan can detect
such error

==2302==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fff98193870 at pc 0xbd55ea bp 0x7fff981935a0 sp 0x7fff98193598
WRITE of size 16 at 0x7fff98193870 thread T0
    #0 0xbd55e9 in frame_register_unwind(frame_info*, int, int*, int*, lval_type*, unsigned long*, int*, unsigned char*) /home/yao/SourceCode/gnu/gdb/git/gdb/frame.c:1119
    #1 0xbd58c8 in frame_register(frame_info*, int, int*, int*, lval_type*, unsigned long*, int*, unsigned char*) /home/yao/SourceCode/gnu/gdb/git/gdb/frame.c:1147
    #2 0xbd6e25 in get_frame_register_bytes(frame_info*, int, unsigned long, int, unsigned char*, int*, int*) /home/yao/SourceCode/gnu/gdb/git/gdb/frame.c:1427
    #3 0x70080a in ia64_register_to_value /home/yao/SourceCode/gnu/gdb/git/gdb/ia64-tdep.c:1236
    #4 0xbf570e in gdbarch_register_to_value(gdbarch*, frame_info*, int, type*, unsigned char*, int*, int*) /home/yao/SourceCode/gnu/gdb/git/gdb/gdbarch.c:2619
    #5 0xc05975 in register_to_value_test /home/yao/SourceCode/gnu/gdb/git/gdb/gdbarch-selftests.c:131

Or, even if GDB is not built with asan, GDB just crashes.

*** stack smashing detected ***: ./gdb terminated
Aborted (core dumped)

gdb:

2017-05-24  Yao Qi  <yao.qi@linaro.org>

	* Makefile.in (SFILES): Add gdbarch-selftests.c.
	(COMMON_OBS): Add gdbarch-selftests.o.
	* frame.c [GDB_SELF_TESTS] (create_new_frame): New function.
	* frame.h [GDB_SELF_TESTS] (create_new_frame): Declare.
	* gdbarch-selftests.c: New file.
	* regcache.h (regcache) <~regcache>: Mark it virtual if
	GDB_SELF_TEST.
	<raw_write>: Likewise.
 2017-05-24 22:15:23 +01:00