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Support an "unlimited" number of user-defined arguments
New in v2:
- A few adjustments / simplifications were possible now that we
require C++11:
. Use std::unique_ptr to make the user_args_stack std::vector own
its elements:
static std::vector<std::unique_ptr<user_args>> user_args_stack;
. use vector::emplace_back to construct elements directly in the
corresponding vectors.
. use std::to_string instead of adding a gdb::to_string
replacement.
- Now includes a test.
Docs/NEWS are unchanged from v1 and have already been approved.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I recently wrote a user-defined command that could benefit from
supporting an unlimited number of arguments:
http://palves.net/list-active-signal-handlers-with-gdb/
E.g., 'info signal-dispositions 1 2 3 4 5 6 7 8 9 10 11'
However, we currently only support up to 10 arguments passed to
user-defined commands ($arg0..$arg9).
I can't find a good reason for that, other than "old code with hard
coded limits". This patch removes that limit and modernizes the code
along the way:
- Makes the user_args struct a real C++ class that uses std::vector
for storage.
- Removes the "next" pointer from within user_args and uses a
std::vector to maintain a stack instead.
- Adds a new RAII-based scoped_user_args_level class to help
push/pop user args in the stack instead of using a cleanup.
gdb/ChangeLog:
2016-12-02 Pedro Alves <palves@redhat.com>
* NEWS: Mention that user commands now accept an unlimited number
of arguments.
* cli/cli-script.c: Include <vector>.
(struct string_view): New type.
(MAXUSERARGS): Delete.
(struct user_args): Now a C++ class.
(user_args_stack): New.
(struct scoped_user_args_level): New type.
(execute_user_command): Use scoped_user_args_level.
(arg_cleanup): Delete.
(setup_user_args): Deleted, and refactored as ...
(user_args::user_args): ... this new constructor. Limit of number
of arguments removed.
(insert_user_defined_cmd_args): Defer to user_args_stack.
(user_args::insert_args): New, bits based on old
insert_user_defined_cmd_args with limit of number of arguments
eliminated.
gdb/doc/ChangeLog:
2016-12-02 Pedro Alves <palves@redhat.com>
* gdb.texinfo (User-defined Commands): Limit on number of
arguments passed to user-defined commands removed; update.
gdb/testsuite/ChangeLog:
2016-12-02 Pedro Alves <palves@redhat.com>
* gdb.base/commands.exp (user_defined_command_manyargs_test): New
procedure.
(top level): Call it.
This commit is contained in:
Pedro Alves
@ -33,6 +33,8 @@
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#include "interps.h"
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#include "compile/compile.h"
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#include <vector>
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/* Prototypes for local functions. */
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static enum command_control_type
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@ -41,8 +43,6 @@ recurse_read_control_structure (char * (*read_next_line_func) (void),
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void (*validator)(char *, void *),
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void *closure);
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static struct cleanup * setup_user_args (char *p);
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static char *read_next_line (void);
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/* Level of control structure when reading. */
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@ -54,24 +54,68 @@ static int command_nest_depth = 1;
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/* This is to prevent certain commands being printed twice. */
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static int suppress_next_print_command_trace = 0;
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/* A non-owning slice of a string. */
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struct string_view
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{
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string_view (const char *str_, size_t len_)
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: str (str_), len (len_)
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{}
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const char *str;
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size_t len;
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};
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/* Structure for arguments to user defined functions. */
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#define MAXUSERARGS 10
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struct user_args
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class user_args
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{
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public:
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/* Save the command line and store the locations of arguments passed
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to the user defined function. */
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explicit user_args (const char *line);
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/* Insert the stored user defined arguments into the $arg arguments
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found in LINE. */
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std::string insert_args (const char *line) const;
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private:
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/* Disable copy/assignment. (Since the elements of A point inside
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COMMAND, copying would need to reconstruct the A vector in the
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new copy.) */
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user_args (const user_args &) =delete;
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user_args &operator= (const user_args &) =delete;
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/* It is necessary to store a copy of the command line to ensure
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that the arguments are not overwritten before they are used. */
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std::string m_command_line;
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/* The arguments. Each element points inside M_COMMAND_LINE. */
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std::vector<string_view> m_args;
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};
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/* The stack of arguments passed to user defined functions. We need a
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stack because user-defined functions can call other user-defined
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functions. */
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static std::vector<std::unique_ptr<user_args>> user_args_stack;
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/* An RAII-base class used to push/pop args on the user args
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stack. */
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struct scoped_user_args_level
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{
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/* Parse the command line and push the arguments in the user args
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stack. */
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explicit scoped_user_args_level (const char *line)
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{
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struct user_args *next;
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/* It is necessary to store a malloced copy of the command line to
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ensure that the arguments are not overwritten before they are
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used. */
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char *command;
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struct
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{
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char *arg;
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int len;
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}
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a[MAXUSERARGS];
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int count;
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user_args_stack.emplace_back (new user_args (line));
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}
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*user_args;
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/* Pop the current user arguments from the stack. */
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~scoped_user_args_level ()
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{
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user_args_stack.pop_back ();
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}
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};
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/* Return non-zero if TYPE is a multi-line command (i.e., is terminated
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@ -362,12 +406,12 @@ execute_user_command (struct cmd_list_element *c, char *args)
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/* Null command */
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return;
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old_chain = setup_user_args (args);
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scoped_user_args_level push_user_args (args);
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if (++user_call_depth > max_user_call_depth)
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error (_("Max user call depth exceeded -- command aborted."));
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make_cleanup (do_restore_user_call_depth, &user_call_depth);
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old_chain = make_cleanup (do_restore_user_call_depth, &user_call_depth);
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/* Set the instream to 0, indicating execution of a
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user-defined function. */
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@ -668,62 +712,32 @@ if_command (char *arg, int from_tty)
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free_command_lines (&command);
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}
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/* Cleanup */
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static void
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arg_cleanup (void *ignore)
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/* Bind the incoming arguments for a user defined command to $arg0,
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$arg1 ... $argN. */
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user_args::user_args (const char *command_line)
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{
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struct user_args *oargs = user_args;
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const char *p;
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if (!user_args)
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internal_error (__FILE__, __LINE__,
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_("arg_cleanup called with no user args.\n"));
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if (command_line == NULL)
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return;
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user_args = user_args->next;
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xfree (oargs->command);
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xfree (oargs);
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}
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/* Bind the incomming arguments for a user defined command to
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$arg0, $arg1 ... $argMAXUSERARGS. */
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static struct cleanup *
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setup_user_args (char *p)
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{
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struct user_args *args;
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struct cleanup *old_chain;
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unsigned int arg_count = 0;
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args = XNEW (struct user_args);
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memset (args, 0, sizeof (struct user_args));
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args->next = user_args;
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user_args = args;
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old_chain = make_cleanup (arg_cleanup, 0/*ignored*/);
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if (p == NULL)
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return old_chain;
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user_args->command = p = xstrdup (p);
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m_command_line = command_line;
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p = m_command_line.c_str ();
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while (*p)
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{
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char *start_arg;
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const char *start_arg;
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int squote = 0;
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int dquote = 0;
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int bsquote = 0;
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if (arg_count >= MAXUSERARGS)
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error (_("user defined function may only have %d arguments."),
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MAXUSERARGS);
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/* Strip whitespace. */
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while (*p == ' ' || *p == '\t')
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p++;
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/* P now points to an argument. */
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start_arg = p;
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user_args->a[arg_count].arg = p;
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/* Get to the end of this argument. */
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while (*p)
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@ -757,11 +771,8 @@ setup_user_args (char *p)
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}
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}
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user_args->a[arg_count].len = p - start_arg;
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arg_count++;
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user_args->count++;
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m_args.emplace_back (start_arg, p - start_arg);
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}
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return old_chain;
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}
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/* Given character string P, return a point to the first argument
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@ -787,40 +798,48 @@ insert_user_defined_cmd_args (const char *line)
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{
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/* If we are not in a user-defined command, treat $argc, $arg0, et
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cetera as normal convenience variables. */
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if (user_args == NULL)
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if (user_args_stack.empty ())
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return line;
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const std::unique_ptr<user_args> &args = user_args_stack.back ();
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return args->insert_args (line);
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}
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/* Insert the user defined arguments stored in user_args into the $arg
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arguments found in line. */
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std::string
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user_args::insert_args (const char *line) const
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{
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std::string new_line;
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const char *p;
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while ((p = locate_arg (line)))
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{
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int i, len;
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new_line.append (line, p - line);
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if (p[4] == 'c')
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{
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gdb_assert (user_args->count >= 0 && user_args->count <= 10);
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if (user_args->count == 10)
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{
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new_line += '1';
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new_line += '0';
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}
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else
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new_line += user_args->count + '0';
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new_line += std::to_string (m_args.size ());
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line = p + 5;
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}
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else
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{
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i = p[4] - '0';
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if (i >= user_args->count)
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error (_("Missing argument %d in user function."), i);
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char *tmp;
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unsigned long i;
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len = user_args->a[i].len;
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if (len > 0)
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new_line.append (user_args->a[i].arg, len);
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errno = 0;
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i = strtoul (p + 4, &tmp, 10);
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if ((i == 0 && tmp == p + 4) || errno != 0)
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line = p + 4;
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else if (i >= m_args.size ())
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error (_("Missing argument %ld in user function."), i);
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else
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{
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new_line.append (m_args[i].str, m_args[i].len);
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line = tmp;
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}
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}
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line = p + 5;
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}
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/* Don't forget the tail. */
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new_line.append (line);
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