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Don't rely on inferior_ptid in record_full_wait 

The multi-target patch sets inferior_ptid to null_ptid before handling
a target event, and thus before calling target_wait, in order to catch
places in target_ops::wait implementations that are incorrectly
relying on inferior_ptid (which could otherwise be a ptid of a
different target, for example).  That caught this instance in
record-full.c.

Fix it by saving the last resumed ptid, and then using it in
record_full_wait_1, just like how the last "step" argument passed to
record_full_target::resume is handled too.

gdb/ChangeLog:
2020-01-10  Pedro Alves  <palves@redhat.com>

	* record-full.c (record_full_resume_ptid): New global.
	(record_full_target::resume): Set it.
	(record_full_wait_1): Use record_full_resume_ptid instead of
	inferior_ptid.
This commit is contained in:
Pedro Alves 2020-01-10 20:05:41 +00:00
parent 873657b9e8
commit ec506636cc
3 changed files with 20 additions and 1 deletions
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7
gdb/ChangeLog
View File

@ -1,3 +1,10 @@
2020-01-10 Pedro Alves <palves@redhat.com>
* record-full.c (record_full_resume_ptid): New global.
(record_full_target::resume): Set it.
(record_full_wait_1): Use record_full_resume_ptid instead of
inferior_ptid.
2020-01-10 Pedro Alves <palves@redhat.com>
* gdbthread.h (scoped_restore_current_thread)

7
gdb/record-full.c
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@ -1036,6 +1036,9 @@ record_full_base_target::async (int enable)
beneath ()->async (enable);
}
/* The PTID and STEP arguments last passed to
record_full_target::resume. */
static ptid_t record_full_resume_ptid = null_ptid;
static int record_full_resume_step = 0;
/* True if we've been resumed, and so each record_full_wait call should
@ -1064,6 +1067,7 @@ static enum exec_direction_kind record_full_execution_dir = EXEC_FORWARD;
void
record_full_target::resume (ptid_t ptid, int step, enum gdb_signal signal)
{
record_full_resume_ptid = inferior_ptid;
record_full_resume_step = step;
record_full_resumed = 1;
record_full_execution_dir = ::execution_direction;
@ -1190,7 +1194,8 @@ record_full_wait_1 (struct target_ops *ops,
/* This is not a single step. */
ptid_t ret;
CORE_ADDR tmp_pc;
struct gdbarch *gdbarch = target_thread_architecture (inferior_ptid);
struct gdbarch *gdbarch
= target_thread_architecture (record_full_resume_ptid);
while (1)
{

7
gdb/target.h
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@ -478,6 +478,13 @@ struct target_ops
TARGET_DEFAULT_NORETURN (noprocess ());
virtual void commit_resume ()
TARGET_DEFAULT_IGNORE ();
/* See target_wait's description. Note that implementations of
this method must not assume that inferior_ptid on entry is
pointing at the thread or inferior that ends up reporting an
event. The reported event could be for some other thread in
the current inferior or even for a different process of the
current target. inferior_ptid may also be null_ptid on
entry. */
virtual ptid_t wait (ptid_t, struct target_waitstatus *,
int TARGET_DEBUG_PRINTER (target_debug_print_options))
TARGET_DEFAULT_FUNC (default_target_wait);