/* GDB routines for supporting auto-loaded scripts.
- Copyright (C) 2010, 2011 Free Software Foundation, Inc.
+ Copyright (C) 2010-2018 Free Software Foundation, Inc.
This file is part of GDB.
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
-#include "gdb_string.h"
-#include "gdb_regex.h"
#include "top.h"
-#include "exceptions.h"
-#include "command.h"
#include "gdbcmd.h"
-#include "observer.h"
-#include "progspace.h"
#include "objfiles.h"
#include "python.h"
-#include "cli/cli-cmds.h"
-
-/* Internal-use flag to enable/disable auto-loading.
- This is true if we should auto-load python code when an objfile is opened,
- false otherwise.
-
- Both auto_load_scripts && gdbpy_global_auto_load must be true to enable
- auto-loading.
-
- This flag exists to facilitate deferring auto-loading during start-up
- until after ./.gdbinit has been read; it may augment the search directories
- used to find the scripts. */
-int gdbpy_global_auto_load = 1;
-
-#ifdef HAVE_PYTHON
-
+#include "auto-load.h"
#include "python-internal.h"
-/* NOTE: It's trivial to also support auto-loading normal gdb scripts.
- There has yet to be a need so it's not implemented. */
-
-/* The suffix of per-objfile scripts to auto-load.
- E.g. When the program loads libfoo.so, look for libfoo-gdb.py. */
-#define GDBPY_AUTO_FILE_NAME "-gdb.py"
-
-/* The section to look for scripts (in file formats that support sections).
- Each entry in this section is a byte of value 1, and then the nul-terminated
- name of the script. The script name may include a directory.
- The leading byte is to allow upward compatible extensions. */
-#define GDBPY_AUTO_SECTION_NAME ".debug_gdb_scripts"
-
-/* For scripts specified in .debug_gdb_scripts, multiple objfiles may load
- the same script. There's no point in loading the script multiple times,
- and there can be a lot of objfiles and scripts, so we keep track of scripts
- loaded this way. */
-
-struct auto_load_pspace_info
-{
- /* For each program space we keep track of loaded scripts. */
- struct htab *loaded_scripts;
-};
-
-/* Objects of this type are stored in the loaded script hash table. */
-
-struct loaded_script_entry
-{
- /* Name as provided by the objfile. */
- const char *name;
- /* Full path name or NULL if script wasn't found (or was otherwise
- inaccessible). */
- const char *full_path;
-};
-
-/* User-settable option to enable/disable auto-loading:
- set auto-load-scripts on|off
- This is true if we should auto-load associated scripts when an objfile
- is opened, false otherwise.
- At the moment, this only affects python scripts, but there's no reason
- one couldn't also have other kinds of auto-loaded scripts, and there's
- no reason to have them each controlled by a separate flag.
- So we elide "python" from the name here and in the option.
- The fact that it lives here is just an implementation detail. */
-static int auto_load_scripts = 1;
+/* User-settable option to enable/disable auto-loading of Python scripts:
+ set auto-load python-scripts on|off
+ This is true if we should auto-load associated Python scripts when an
+ objfile is opened, false otherwise. */
+static int auto_load_python_scripts = 1;
-/* Per-program-space data key. */
-static const struct program_space_data *auto_load_pspace_data;
+/* "show" command for the auto_load_python_scripts configuration variable. */
static void
-auto_load_pspace_data_cleanup (struct program_space *pspace, void *arg)
-{
- struct auto_load_pspace_info *info;
-
- info = program_space_data (pspace, auto_load_pspace_data);
- if (info != NULL)
- {
- if (info->loaded_scripts)
- htab_delete (info->loaded_scripts);
- xfree (info);
- }
-}
-
-/* Get the current autoload data. If none is found yet, add it now. This
- function always returns a valid object. */
-
-static struct auto_load_pspace_info *
-get_auto_load_pspace_data (struct program_space *pspace)
-{
- struct auto_load_pspace_info *info;
-
- info = program_space_data (pspace, auto_load_pspace_data);
- if (info == NULL)
- {
- info = XZALLOC (struct auto_load_pspace_info);
- set_program_space_data (pspace, auto_load_pspace_data, info);
- }
-
- return info;
-}
-
-/* Hash function for the loaded script hash. */
-
-static hashval_t
-hash_loaded_script_entry (const void *data)
-{
- const struct loaded_script_entry *e = data;
-
- return htab_hash_string (e->name);
-}
-
-/* Equality function for the loaded script hash. */
-
-static int
-eq_loaded_script_entry (const void *a, const void *b)
+show_auto_load_python_scripts (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
{
- const struct loaded_script_entry *ea = a;
- const struct loaded_script_entry *eb = b;
-
- return strcmp (ea->name, eb->name) == 0;
+ fprintf_filtered (file, _("Auto-loading of Python scripts is %s.\n"), value);
}
-/* Create the hash table used for loaded scripts.
- Each entry is hashed by the full path name. */
+/* Return non-zero if auto-loading Python scripts is enabled.
+ This is the extension_language_script_ops.auto_load_enabled "method". */
-static void
-create_loaded_scripts_hash (struct auto_load_pspace_info *pspace_info)
+int
+gdbpy_auto_load_enabled (const struct extension_language_defn *extlang)
{
- /* Choose 31 as the starting size of the hash table, somewhat arbitrarily.
- Space for each entry is obtained with one malloc so we can free them
- easily. */
-
- pspace_info->loaded_scripts = htab_create (31,
- hash_loaded_script_entry,
- eq_loaded_script_entry,
- xfree);
+ return auto_load_python_scripts;
}
-/* Load scripts specified in OBJFILE.
- START,END delimit a buffer containing a list of nul-terminated
- file names.
- SOURCE_NAME is used in error messages.
-
- Scripts are found per normal "source -s" command processing.
- First the script is looked for in $cwd. If not found there the
- source search path is used.
-
- The section contains a list of path names of files containing
- python code to load. Each path is null-terminated. */
+/* Wrapper for "info auto-load python-scripts". */
static void
-source_section_scripts (struct objfile *objfile, const char *source_name,
- const char *start, const char *end)
+info_auto_load_python_scripts (const char *pattern, int from_tty)
{
- const char *p;
- struct auto_load_pspace_info *pspace_info;
- struct loaded_script_entry **slot, entry;
-
- pspace_info = get_auto_load_pspace_data (current_program_space);
- if (pspace_info->loaded_scripts == NULL)
- create_loaded_scripts_hash (pspace_info);
-
- for (p = start; p < end; ++p)
- {
- const char *file;
- FILE *stream;
- char *full_path;
- int opened, in_hash_table;
-
- if (*p != 1)
- {
- warning (_("Invalid entry in %s section"), GDBPY_AUTO_SECTION_NAME);
- /* We could try various heuristics to find the next valid entry,
- but it's safer to just punt. */
- break;
- }
- file = ++p;
-
- while (p < end && *p != '\0')
- ++p;
- if (p == end)
- {
- char *buf = alloca (p - file + 1);
-
- memcpy (buf, file, p - file);
- buf[p - file] = '\0';
- warning (_("Non-null-terminated path in %s: %s"),
- source_name, buf);
- /* Don't load it. */
- break;
- }
- if (p == file)
- {
- warning (_("Empty path in %s"), source_name);
- continue;
- }
-
- opened = find_and_open_script (file, 1 /*search_path*/,
- &stream, &full_path);
-
- /* If the file is not found, we still record the file in the hash table,
- we only want to print an error message once.
- IWBN if complaints.c were more general-purpose. */
-
- entry.name = file;
- if (opened)
- entry.full_path = full_path;
- else
- entry.full_path = NULL;
- slot = ((struct loaded_script_entry **)
- htab_find_slot (pspace_info->loaded_scripts,
- &entry, INSERT));
- in_hash_table = *slot != NULL;
-
- /* If this file is not in the hash table, add it. */
- if (! in_hash_table)
- {
- char *p;
-
- *slot = xmalloc (sizeof (**slot)
- + strlen (file) + 1
- + (opened ? (strlen (full_path) + 1) : 0));
- p = ((char*) *slot) + sizeof (**slot);
- strcpy (p, file);
- (*slot)->name = p;
- if (opened)
- {
- p += strlen (p) + 1;
- strcpy (p, full_path);
- (*slot)->full_path = p;
- }
- else
- (*slot)->full_path = NULL;
- }
-
- if (opened)
- free (full_path);
-
- if (! opened)
- {
- /* We don't throw an error, the program is still debuggable.
- Check in_hash_table to only print the warning once. */
- if (! in_hash_table)
- warning (_("%s (referenced in %s): %s"),
- file, GDBPY_AUTO_SECTION_NAME, safe_strerror (errno));
- continue;
- }
-
- /* If this file is not currently loaded, load it. */
- if (! in_hash_table)
- source_python_script_for_objfile (objfile, stream, file);
- }
-}
-
-/* Load scripts specified in section SECTION_NAME of OBJFILE. */
-
-static void
-auto_load_section_scripts (struct objfile *objfile, const char *section_name)
-{
- bfd *abfd = objfile->obfd;
- asection *scripts_sect;
- bfd_size_type size;
- char *p;
- struct cleanup *cleanups;
-
- scripts_sect = bfd_get_section_by_name (abfd, section_name);
- if (scripts_sect == NULL)
- return;
-
- size = bfd_get_section_size (scripts_sect);
- p = xmalloc (size);
-
- cleanups = make_cleanup (xfree, p);
-
- if (bfd_get_section_contents (abfd, scripts_sect, p, (file_ptr) 0, size))
- source_section_scripts (objfile, section_name, p, p + size);
- else
- warning (_("Couldn't read %s section of %s"),
- section_name, bfd_get_filename (abfd));
-
- do_cleanups (cleanups);
-}
-
-/* Clear the table of loaded section scripts. */
-
-static void
-clear_section_scripts (void)
-{
- struct program_space *pspace = current_program_space;
- struct auto_load_pspace_info *info;
-
- info = program_space_data (pspace, auto_load_pspace_data);
- if (info != NULL && info->loaded_scripts != NULL)
- {
- htab_delete (info->loaded_scripts);
- info->loaded_scripts = NULL;
- }
-}
-
-/* Look for the auto-load script associated with OBJFILE and load it. */
-
-static void
-auto_load_objfile_script (struct objfile *objfile, const char *suffix)
-{
- char *realname;
- char *filename, *debugfile;
- int len;
- FILE *input;
- struct cleanup *cleanups;
-
- realname = gdb_realpath (objfile->name);
- len = strlen (realname);
- filename = xmalloc (len + strlen (suffix) + 1);
- memcpy (filename, realname, len);
- strcpy (filename + len, suffix);
-
- cleanups = make_cleanup (xfree, filename);
- make_cleanup (xfree, realname);
-
- input = fopen (filename, "r");
- debugfile = filename;
-
- if (!input && debug_file_directory)
- {
- /* Also try the same file in the separate debug info directory. */
- debugfile = xmalloc (strlen (filename)
- + strlen (debug_file_directory) + 1);
- strcpy (debugfile, debug_file_directory);
- /* FILENAME is absolute, so we don't need a "/" here. */
- strcat (debugfile, filename);
-
- make_cleanup (xfree, debugfile);
- input = fopen (debugfile, "r");
- }
-
- if (!input && gdb_datadir)
- {
- /* Also try the same file in a subdirectory of gdb's data
- directory. */
- debugfile = xmalloc (strlen (gdb_datadir) + strlen (filename)
- + strlen ("/auto-load") + 1);
- strcpy (debugfile, gdb_datadir);
- strcat (debugfile, "/auto-load");
- /* FILENAME is absolute, so we don't need a "/" here. */
- strcat (debugfile, filename);
-
- make_cleanup (xfree, debugfile);
- input = fopen (debugfile, "r");
- }
-
- if (input)
- {
- source_python_script_for_objfile (objfile, input, debugfile);
- fclose (input);
- }
-
- do_cleanups (cleanups);
-}
-
-/* This is a new_objfile observer callback to auto-load scripts.
-
- Two flavors of auto-loaded scripts are supported.
- 1) based on the path to the objfile
- 2) from .debug_gdb_scripts section */
-
-static void
-auto_load_new_objfile (struct objfile *objfile)
-{
- if (!objfile)
- {
- /* OBJFILE is NULL when loading a new "main" symbol-file. */
- clear_section_scripts ();
- return;
- }
-
- load_auto_scripts_for_objfile (objfile);
-}
-
-/* Load any auto-loaded scripts for OBJFILE. */
-
-void
-load_auto_scripts_for_objfile (struct objfile *objfile)
-{
- if (auto_load_scripts && gdbpy_global_auto_load)
- {
- auto_load_objfile_script (objfile, GDBPY_AUTO_FILE_NAME);
- auto_load_section_scripts (objfile, GDBPY_AUTO_SECTION_NAME);
- }
+ auto_load_info_scripts (pattern, from_tty, &extension_language_python);
}
\f
-/* Traversal function for htab_traverse.
- Print the entry if specified in the regex. */
-
-static int
-maybe_print_section_script (void **slot, void *info)
-{
- struct loaded_script_entry *entry = *slot;
-
- if (re_exec (entry->name))
- {
- printf_filtered (_("Script name: %s\n"), entry->name);
- printf_filtered (_(" Full name: %s\n"),
- entry->full_path ? entry->full_path : _("unknown"));
- }
-
- return 1;
-}
-
-/* "maint print section-scripts" command. */
-
-static void
-maintenance_print_section_scripts (char *pattern, int from_tty)
-{
- struct auto_load_pspace_info *pspace_info;
-
- dont_repeat ();
-
- if (pattern && *pattern)
- {
- char *re_err = re_comp (pattern);
-
- if (re_err)
- error (_("Invalid regexp: %s"), re_err);
-
- printf_filtered (_("Objfile scripts matching %s:\n"), pattern);
- }
- else
- {
- re_comp ("");
- printf_filtered (_("Objfile scripts:\n"));
- }
-
- pspace_info = get_auto_load_pspace_data (current_program_space);
- if (pspace_info == NULL || pspace_info->loaded_scripts == NULL)
- return;
-
- immediate_quit++;
- htab_traverse_noresize (pspace_info->loaded_scripts,
- maybe_print_section_script, NULL);
- immediate_quit--;
-}
-\f
-void
+int
gdbpy_initialize_auto_load (void)
{
- auto_load_pspace_data
- = register_program_space_data_with_cleanup (auto_load_pspace_data_cleanup);
+ struct cmd_list_element *cmd;
+ const char *cmd_name;
- observer_attach_new_objfile (auto_load_new_objfile);
+ add_setshow_boolean_cmd ("python-scripts", class_support,
+ &auto_load_python_scripts, _("\
+Set the debugger's behaviour regarding auto-loaded Python scripts."), _("\
+Show the debugger's behaviour regarding auto-loaded Python scripts."), _("\
+If enabled, auto-loaded Python scripts are loaded when the debugger reads\n\
+an executable or shared library.\n\
+This options has security implications for untrusted inferiors."),
+ NULL, show_auto_load_python_scripts,
+ auto_load_set_cmdlist_get (),
+ auto_load_show_cmdlist_get ());
add_setshow_boolean_cmd ("auto-load-scripts", class_support,
- &auto_load_scripts, _("\
-Set the debugger's behaviour regarding auto-loaded scripts."), _("\
-Show the debugger's behaviour regarding auto-loaded scripts."), _("\
-If enabled, auto-loaded scripts are loaded when the debugger reads\n\
-an executable or shared library."),
- NULL, NULL,
- &setlist,
- &showlist);
-
- add_cmd ("section-scripts", class_maintenance,
- maintenance_print_section_scripts,
- _("Print dump of auto-loaded section scripts matching REGEXP."),
- &maintenanceprintlist);
-}
-
-#else /* ! HAVE_PYTHON */
-
-void
-load_auto_scripts_for_objfile (struct objfile *objfile)
-{
+ &auto_load_python_scripts, _("\
+Set the debugger's behaviour regarding auto-loaded Python scripts, "
+ "deprecated."),
+ _("\
+Show the debugger's behaviour regarding auto-loaded Python scripts, "
+ "deprecated."),
+ NULL, NULL, show_auto_load_python_scripts,
+ &setlist, &showlist);
+ cmd_name = "auto-load-scripts";
+ cmd = lookup_cmd (&cmd_name, setlist, "", -1, 1);
+ deprecate_cmd (cmd, "set auto-load python-scripts");
+
+ /* It is needed because lookup_cmd updates the CMD_NAME pointer. */
+ cmd_name = "auto-load-scripts";
+ cmd = lookup_cmd (&cmd_name, showlist, "", -1, 1);
+ deprecate_cmd (cmd, "show auto-load python-scripts");
+
+ add_cmd ("python-scripts", class_info, info_auto_load_python_scripts,
+ _("Print the list of automatically loaded Python scripts.\n\
+Usage: info auto-load python-scripts [REGEXP]"),
+ auto_load_info_cmdlist_get ());
+
+ cmd = add_info ("auto-load-scripts", info_auto_load_python_scripts, _("\
+Print the list of automatically loaded Python scripts, deprecated."));
+ deprecate_cmd (cmd, "info auto-load python-scripts");
+
+ return 0;
}
-
-#endif /* ! HAVE_PYTHON */
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