[v2,5/9] Introduce "static constructor" for mi_parse
Commit Message
Change the mi_parse function to be a static method of mi_parse. This
lets us remove the 'set_args' setter function.
---
gdb/mi/mi-main.c | 2 +-
gdb/mi/mi-parse.c | 6 +++---
gdb/mi/mi-parse.h | 28 +++++++++++++---------------
3 files changed, 17 insertions(+), 19 deletions(-)
Comments
Tom Tromey via Gdb-patches <gdb-patches@sourceware.org> writes:
> Change the mi_parse function to be a static method of mi_parse. This
> lets us remove the 'set_args' setter function.
Hi Tom,
Sorry to respond to such an old thread, but I ran into the
mi_parse::make code today. From your commit message I don't see the
connection for why we need a static mi_parse::make function in order to
get rid of the set_args method.
For reference, I switched the code back to using constructors (but
didn't add back set_args), and I'm not seeing any regressions in
gdb.mi/* and gdb.python/*.
Could you expand on why this change is needed?
Thanks,
Andrew
> ---
> gdb/mi/mi-main.c | 2 +-
> gdb/mi/mi-parse.c | 6 +++---
> gdb/mi/mi-parse.h | 28 +++++++++++++---------------
> 3 files changed, 17 insertions(+), 19 deletions(-)
>
> diff --git a/gdb/mi/mi-main.c b/gdb/mi/mi-main.c
> index aaebce40fac..b430115daea 100644
> --- a/gdb/mi/mi-main.c
> +++ b/gdb/mi/mi-main.c
> @@ -1919,7 +1919,7 @@ mi_execute_command (const char *cmd, int from_tty)
>
> try
> {
> - command = mi_parse (cmd, &token);
> + command = mi_parse::make (cmd, &token);
> }
> catch (const gdb_exception &exception)
> {
> diff --git a/gdb/mi/mi-parse.c b/gdb/mi/mi-parse.c
> index f077eb36a7c..b7c5a8cecdf 100644
> --- a/gdb/mi/mi-parse.c
> +++ b/gdb/mi/mi-parse.c
> @@ -109,7 +109,7 @@ mi_parse_escape (const char **string_ptr)
> void
> mi_parse::parse_argv ()
> {
> - const char *chp = m_args.get ();
> + const char *chp = m_args.c_str ();
> int argc = 0;
> char **argv = XNEWVEC (char *, argc + 1);
>
> @@ -216,7 +216,7 @@ mi_parse::~mi_parse ()
> }
>
> std::unique_ptr<struct mi_parse>
> -mi_parse (const char *cmd, char **token)
> +mi_parse::make (const char *cmd, char **token)
> {
> const char *chp;
>
> @@ -345,7 +345,7 @@ mi_parse (const char *cmd, char **token)
> }
>
> /* Save the rest of the arguments for the command. */
> - parse->set_args (chp);
> + parse->m_args = chp;
>
> /* Fully parsed, flag as an MI command. */
> parse->op = MI_COMMAND;
> diff --git a/gdb/mi/mi-parse.h b/gdb/mi/mi-parse.h
> index edb61547354..6f1da6e6eb5 100644
> --- a/gdb/mi/mi-parse.h
> +++ b/gdb/mi/mi-parse.h
> @@ -41,7 +41,17 @@ enum mi_command_type
>
> struct mi_parse
> {
> - mi_parse () = default;
> + /* Attempts to parse CMD returning a ``struct mi_parse''. If CMD is
> + invalid, an exception is thrown. For an MI_COMMAND COMMAND, ARGS
> + and OP are initialized. Un-initialized fields are zero. *TOKEN is
> + set to the token, even if an exception is thrown. It is allocated
> + with xmalloc; it must either be freed with xfree, or assigned to
> + the TOKEN field of the resultant mi_parse object, to be freed by
> + mi_parse_free. */
> +
> + static std::unique_ptr<struct mi_parse> make (const char *cmd,
> + char **token);
> +
> ~mi_parse ();
>
> DISABLE_COPY_AND_ASSIGN (mi_parse);
> @@ -54,9 +64,6 @@ struct mi_parse
> const char *args () const
> { return m_args.c_str (); }
>
> - void set_args (const char *args)
> - { m_args = args; }
> -
> enum mi_command_type op = MI_COMMAND;
> char *command = nullptr;
> char *token = nullptr;
> @@ -75,20 +82,11 @@ struct mi_parse
>
> private:
>
> + mi_parse () = default;
> +
> std::string m_args;
> };
>
> -/* Attempts to parse CMD returning a ``struct mi_parse''. If CMD is
> - invalid, an exception is thrown. For an MI_COMMAND COMMAND, ARGS
> - and OP are initialized. Un-initialized fields are zero. *TOKEN is
> - set to the token, even if an exception is thrown. It is allocated
> - with xmalloc; it must either be freed with xfree, or assigned to
> - the TOKEN field of the resultant mi_parse object, to be freed by
> - mi_parse_free. */
> -
> -extern std::unique_ptr<struct mi_parse> mi_parse (const char *cmd,
> - char **token);
> -
> /* Parse a string argument into a print_values value. */
>
> enum print_values mi_parse_print_values (const char *name);
>
> --
> 2.40.0
>>>>> "Andrew" == Andrew Burgess <aburgess@redhat.com> writes:
Andrew> Sorry to respond to such an old thread, but I ran into the
Andrew> mi_parse::make code today. From your commit message I don't see the
Andrew> connection for why we need a static mi_parse::make function in order to
Andrew> get rid of the set_args method.
Andrew> For reference, I switched the code back to using constructors (but
Andrew> didn't add back set_args), and I'm not seeing any regressions in
Andrew> gdb.mi/* and gdb.python/*.
Andrew> Could you expand on why this change is needed?
I don't recall what exactly I was thinking when I wrote it. It might
have been a leftover from some other attempt to use unique_ptr to ensure
there isn't a possibility of a leak.
I think it's fine to switch it to constructors if that is convenient for
you.
Tom
Tom Tromey <tromey@adacore.com> writes:
>>>>>> "Andrew" == Andrew Burgess <aburgess@redhat.com> writes:
>
> Andrew> Sorry to respond to such an old thread, but I ran into the
> Andrew> mi_parse::make code today. From your commit message I don't see the
> Andrew> connection for why we need a static mi_parse::make function in order to
> Andrew> get rid of the set_args method.
>
> Andrew> For reference, I switched the code back to using constructors (but
> Andrew> didn't add back set_args), and I'm not seeing any regressions in
> Andrew> gdb.mi/* and gdb.python/*.
>
> Andrew> Could you expand on why this change is needed?
>
> I don't recall what exactly I was thinking when I wrote it. It might
> have been a leftover from some other attempt to use unique_ptr to ensure
> there isn't a possibility of a leak.
>
> I think it's fine to switch it to constructors if that is convenient for
> you.
Thanks. I'll CC you when I post the patch. Just thought I'd ask first,
didn't want to look like I was just trying to revert your work :)
Thanks,
Andrew
@@ -1919,7 +1919,7 @@ mi_execute_command (const char *cmd, int from_tty)
try
{
- command = mi_parse (cmd, &token);
+ command = mi_parse::make (cmd, &token);
}
catch (const gdb_exception &exception)
{
@@ -109,7 +109,7 @@ mi_parse_escape (const char **string_ptr)
void
mi_parse::parse_argv ()
{
- const char *chp = m_args.get ();
+ const char *chp = m_args.c_str ();
int argc = 0;
char **argv = XNEWVEC (char *, argc + 1);
@@ -216,7 +216,7 @@ mi_parse::~mi_parse ()
}
std::unique_ptr<struct mi_parse>
-mi_parse (const char *cmd, char **token)
+mi_parse::make (const char *cmd, char **token)
{
const char *chp;
@@ -345,7 +345,7 @@ mi_parse (const char *cmd, char **token)
}
/* Save the rest of the arguments for the command. */
- parse->set_args (chp);
+ parse->m_args = chp;
/* Fully parsed, flag as an MI command. */
parse->op = MI_COMMAND;
@@ -41,7 +41,17 @@ enum mi_command_type
struct mi_parse
{
- mi_parse () = default;
+ /* Attempts to parse CMD returning a ``struct mi_parse''. If CMD is
+ invalid, an exception is thrown. For an MI_COMMAND COMMAND, ARGS
+ and OP are initialized. Un-initialized fields are zero. *TOKEN is
+ set to the token, even if an exception is thrown. It is allocated
+ with xmalloc; it must either be freed with xfree, or assigned to
+ the TOKEN field of the resultant mi_parse object, to be freed by
+ mi_parse_free. */
+
+ static std::unique_ptr<struct mi_parse> make (const char *cmd,
+ char **token);
+
~mi_parse ();
DISABLE_COPY_AND_ASSIGN (mi_parse);
@@ -54,9 +64,6 @@ struct mi_parse
const char *args () const
{ return m_args.c_str (); }
- void set_args (const char *args)
- { m_args = args; }
-
enum mi_command_type op = MI_COMMAND;
char *command = nullptr;
char *token = nullptr;
@@ -75,20 +82,11 @@ struct mi_parse
private:
+ mi_parse () = default;
+
std::string m_args;
};
-/* Attempts to parse CMD returning a ``struct mi_parse''. If CMD is
- invalid, an exception is thrown. For an MI_COMMAND COMMAND, ARGS
- and OP are initialized. Un-initialized fields are zero. *TOKEN is
- set to the token, even if an exception is thrown. It is allocated
- with xmalloc; it must either be freed with xfree, or assigned to
- the TOKEN field of the resultant mi_parse object, to be freed by
- mi_parse_free. */
-
-extern std::unique_ptr<struct mi_parse> mi_parse (const char *cmd,
- char **token);
-
/* Parse a string argument into a print_values value. */
enum print_values mi_parse_print_values (const char *name);