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remote: Return NULL extra_info/name if they are empty 

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  remote: C++ify thread_item and threads_listing_context
  21fe1c752e

broke the test gdb.threads/names.exp.  The problem is that since we now
use an std::string to hold the extra_info, an empty string is returned
by target_extra_thread_info to print_thread_info_1 when the remote stub
didn't send any extra info, instead of NULL before.  Because of that,
print_thread_info_1 prints the extra info between parentheses, which
results in some spurious empty parentheses.

  Expected: * 1    Thread 22752.22752 "main" all_threads_ready () at ...
  Actual  : * 1    Thread 22752.22752 "main" () all_threads_ready () a ...

Since the bug was introduced by a behavior change in the remote target,
I chose to fix it on the remote target side by making it return NULL
when the extra string is empty.  This will avoid possibly changing the
behavior of the common code and affecting other targets.

The name field has the same problem.  If a remote stub returns no thread
names, remote_thread_name will return an empty string instead of NULL,
so print_thread_info_1 will show empty quotes ("") instead of nothing.

gdb/ChangeLog:

	PR gdb/22556
	* remote.c (remote_thread_name): Return NULL if name is empty.
	(remote_threads_extra_info): Return NULL if extra info is empty.
This commit is contained in:
Simon Marchi 2017-12-11 21:05:30 -05:00 committed by Simon Marchi
parent 4b1c0f7e85
commit a933405894
2 changed files with 14 additions and 2 deletions
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6
gdb/ChangeLog
View File

@ -1,3 +1,9 @@
2017-12-11 Simon Marchi <simon.marchi@ericsson.com>
PR gdb/22556
* remote.c (remote_thread_name): Return NULL if name is empty.
(remote_threads_extra_info): Return NULL if extra info is empty.
2017-12-11 Pedro Alves <palves@redhat.com>
* defs.h (elf_sym_fns_lazy_psyms, elf_sym_fns_gdb_index)

10
gdb/remote.c
View File

@ -2268,7 +2268,10 @@ static const char *
remote_thread_name (struct target_ops *ops, struct thread_info *info)
{
if (info->priv != NULL)
return get_remote_thread_info (info)->name.c_str ();
{
const std::string &name = get_remote_thread_info (info)->name;
return !name.empty () ? name.c_str () : NULL;
}
return NULL;
}
@ -3319,7 +3322,10 @@ remote_threads_extra_info (struct target_ops *self, struct thread_info *tp)
struct thread_info *info = find_thread_ptid (tp->ptid);
if (info != NULL && info->priv != NULL)
return get_remote_thread_info (info)->extra.c_str ();
{
const std::string &extra = get_remote_thread_info (info)->extra;
return !extra.empty () ? extra.c_str () : NULL;
}
else
return NULL;
}