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New function null_stream

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This patch adds a new function null_stream, which returns a null
stream.  The null stream can be used in multiple places.  It is
used in gdb_insn_length, and the following patches will use it too.

gdb:

2017-01-26  Yao Qi  <yao.qi@linaro.org>

	* disasm.c (do_ui_file_delete): Delete.
	(gdb_insn_length): Move code creating stream to ...
	* utils.c (null_stream): ... here.  New function.
	* utils.h (null_stream): Declare.
This commit is contained in:
Yao Qi
2017-01-26 14:29:19 +00:00
parent 8e87a59348
commit 80d758749a
4 changed files with 26 additions and 16 deletions
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15
gdb/utils.c
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@@ -199,6 +199,21 @@ make_cleanup_ui_file_delete (struct ui_file *arg)
return make_cleanup (do_ui_file_delete, arg);
}
struct ui_file *
null_stream (void)
{
/* A simple implementation of singleton pattern. */
static struct ui_file *stream = NULL;
if (stream == NULL)
{
stream = ui_file_new ();
/* Delete it on gdb exit. */
make_final_cleanup (do_ui_file_delete, stream);
}
return stream;
}
/* Helper function for make_cleanup_ui_out_redirect_pop. */
static void