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[/] [openrisc/] [tags/] [gnu-src/] [gdb-7.2/] [gdb-7.2-or32-1.0rc1/] [gdb/] [interps.c] - Rev 435
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/* Manages interpreters for GDB, the GNU debugger. Copyright (C) 2000, 2002, 2003, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. Written by Jim Ingham <jingham@apple.com> of Apple Computer, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ /* This is just a first cut at separating out the "interpreter" functions of gdb into self-contained modules. There are a couple of open areas that need to be sorted out: 1) The interpreter explicitly contains a UI_OUT, and can insert itself into the event loop, but it doesn't explicitly contain hooks for readline. I did this because it seems to me many interpreters won't want to use the readline command interface, and it is probably simpler to just let them take over the input in their resume proc. */ #include "defs.h" #include "gdbcmd.h" #include "ui-out.h" #include "event-loop.h" #include "event-top.h" #include "interps.h" #include "completer.h" #include "gdb_string.h" #include "gdb_assert.h" #include "top.h" /* For command_loop. */ #include "exceptions.h" struct interp { /* This is the name in "-i=" and set interpreter. */ const char *name; /* Interpreters are stored in a linked list, this is the next one... */ struct interp *next; /* This is a cookie that an instance of the interpreter can use. This is a bit confused right now as the exact initialization sequence for it, and how it relates to the interpreter's uiout object is a bit confused. */ void *data; /* Has the init_proc been run? */ int inited; /* This is the ui_out used to collect results for this interpreter. It can be a formatter for stdout, as is the case for the console & mi outputs, or it might be a result formatter. */ struct ui_out *interpreter_out; const struct interp_procs *procs; int quiet_p; }; /* Functions local to this file. */ static void initialize_interps (void); static char **interpreter_completer (struct cmd_list_element *cmd, char *text, char *word); /* The magic initialization routine for this module. */ void _initialize_interpreter (void); /* Variables local to this file: */ static struct interp *interp_list = NULL; static struct interp *current_interpreter = NULL; static struct interp *top_level_interpreter_ptr = NULL; static int interpreter_initialized = 0; /* interp_new - This allocates space for a new interpreter, fills the fields from the inputs, and returns a pointer to the interpreter. */ struct interp * interp_new (const char *name, void *data, struct ui_out *uiout, const struct interp_procs *procs) { struct interp *new_interp; new_interp = XMALLOC (struct interp); new_interp->name = xstrdup (name); new_interp->data = data; new_interp->interpreter_out = uiout; new_interp->quiet_p = 0; new_interp->procs = procs; new_interp->inited = 0; return new_interp; } /* Add interpreter INTERP to the gdb interpreter list. The interpreter must not have previously been added. */ void interp_add (struct interp *interp) { if (!interpreter_initialized) initialize_interps (); gdb_assert (interp_lookup (interp->name) == NULL); interp->next = interp_list; interp_list = interp; } /* This sets the current interpreter to be INTERP. If INTERP has not been initialized, then this will also run the init proc. If the init proc is successful, return 1, if it fails, set the old interpreter back in place and return 0. If we can't restore the old interpreter, then raise an internal error, since we are in pretty bad shape at this point. The TOP_LEVEL parameter tells if this new interpreter is the top-level one. The top-level is what is requested on the command line, and is responsible for reporting general notification about target state changes. For example, if MI is the top-level interpreter, then it will always report events such as target stops and new thread creation, even if they are caused by CLI commands. */ int interp_set (struct interp *interp, int top_level) { struct interp *old_interp = current_interpreter; int first_time = 0; char buffer[64]; /* If we already have an interpreter, then trying to set top level interpreter is kinda pointless. */ gdb_assert (!top_level || !current_interpreter); gdb_assert (!top_level || !top_level_interpreter_ptr); if (current_interpreter != NULL) { do_all_continuations (); ui_out_flush (uiout); if (current_interpreter->procs->suspend_proc && !current_interpreter->procs->suspend_proc (current_interpreter-> data)) { error (_("Could not suspend interpreter \"%s\"."), current_interpreter->name); } } else { first_time = 1; } current_interpreter = interp; if (top_level) top_level_interpreter_ptr = interp; /* We use interpreter_p for the "set interpreter" variable, so we need to make sure we have a malloc'ed copy for the set command to free. */ if (interpreter_p != NULL && strcmp (current_interpreter->name, interpreter_p) != 0) { xfree (interpreter_p); interpreter_p = xstrdup (current_interpreter->name); } uiout = interp->interpreter_out; /* Run the init proc. If it fails, try to restore the old interp. */ if (!interp->inited) { if (interp->procs->init_proc != NULL) { interp->data = interp->procs->init_proc (top_level); } interp->inited = 1; } /* Clear out any installed interpreter hooks/event handlers. */ clear_interpreter_hooks (); if (interp->procs->resume_proc != NULL && (!interp->procs->resume_proc (interp->data))) { if (old_interp == NULL || !interp_set (old_interp, 0)) internal_error (__FILE__, __LINE__, _("Failed to initialize new interp \"%s\" %s"), interp->name, "and could not restore old interp!\n"); return 0; } /* Finally, put up the new prompt to show that we are indeed here. Also, display_gdb_prompt for the console does some readline magic which is needed for the console interpreter, at least... */ if (!first_time) { if (!interp_quiet_p (interp)) { sprintf (buffer, "Switching to interpreter \"%.24s\".\n", interp->name); ui_out_text (uiout, buffer); } display_gdb_prompt (NULL); } return 1; } /* interp_lookup - Looks up the interpreter for NAME. If no such interpreter exists, return NULL, otherwise return a pointer to the interpreter. */ struct interp * interp_lookup (const char *name) { struct interp *interp; if (name == NULL || strlen (name) == 0) return NULL; for (interp = interp_list; interp != NULL; interp = interp->next) { if (strcmp (interp->name, name) == 0) return interp; } return NULL; } /* Returns the current interpreter. */ struct ui_out * interp_ui_out (struct interp *interp) { if (interp != NULL) return interp->interpreter_out; return current_interpreter->interpreter_out; } /* Returns true if the current interp is the passed in name. */ int current_interp_named_p (const char *interp_name) { if (current_interpreter) return (strcmp (current_interpreter->name, interp_name) == 0); return 0; } /* This is called in display_gdb_prompt. If the proc returns a zero value, display_gdb_prompt will return without displaying the prompt. */ int current_interp_display_prompt_p (void) { if (current_interpreter == NULL || current_interpreter->procs->prompt_proc_p == NULL) return 0; else return current_interpreter->procs->prompt_proc_p (current_interpreter-> data); } /* Run the current command interpreter's main loop. */ void current_interp_command_loop (void) { /* Somewhat messy. For the moment prop up all the old ways of selecting the command loop. `deprecated_command_loop_hook' should be deprecated. */ if (deprecated_command_loop_hook != NULL) deprecated_command_loop_hook (); else if (current_interpreter != NULL && current_interpreter->procs->command_loop_proc != NULL) current_interpreter->procs->command_loop_proc (current_interpreter->data); else cli_command_loop (); } int interp_quiet_p (struct interp *interp) { if (interp != NULL) return interp->quiet_p; else return current_interpreter->quiet_p; } static int interp_set_quiet (struct interp *interp, int quiet) { int old_val = interp->quiet_p; interp->quiet_p = quiet; return old_val; } /* interp_exec - This executes COMMAND_STR in the current interpreter. */ int interp_exec_p (struct interp *interp) { return interp->procs->exec_proc != NULL; } struct gdb_exception interp_exec (struct interp *interp, const char *command_str) { if (interp->procs->exec_proc != NULL) { return interp->procs->exec_proc (interp->data, command_str); } return exception_none; } /* A convenience routine that nulls out all the common command hooks. Use it when removing your interpreter in its suspend proc. */ void clear_interpreter_hooks (void) { deprecated_init_ui_hook = 0; deprecated_print_frame_info_listing_hook = 0; /*print_frame_more_info_hook = 0; */ deprecated_query_hook = 0; deprecated_warning_hook = 0; deprecated_interactive_hook = 0; deprecated_readline_begin_hook = 0; deprecated_readline_hook = 0; deprecated_readline_end_hook = 0; deprecated_register_changed_hook = 0; deprecated_context_hook = 0; deprecated_target_wait_hook = 0; deprecated_call_command_hook = 0; deprecated_error_begin_hook = 0; deprecated_command_loop_hook = 0; } /* This is a lazy init routine, called the first time the interpreter module is used. I put it here just in case, but I haven't thought of a use for it yet. I will probably bag it soon, since I don't think it will be necessary. */ static void initialize_interps (void) { interpreter_initialized = 1; /* Don't know if anything needs to be done here... */ } static void interpreter_exec_cmd (char *args, int from_tty) { struct interp *old_interp, *interp_to_use; char **prules = NULL; char **trule = NULL; unsigned int nrules; unsigned int i; int old_quiet, use_quiet; if (args == NULL) error_no_arg (_("interpreter-exec command")); prules = gdb_buildargv (args); make_cleanup_freeargv (prules); nrules = 0; for (trule = prules; *trule != NULL; trule++) nrules++; if (nrules < 2) error (_("usage: interpreter-exec <interpreter> [ <command> ... ]")); old_interp = current_interpreter; interp_to_use = interp_lookup (prules[0]); if (interp_to_use == NULL) error (_("Could not find interpreter \"%s\"."), prules[0]); /* Temporarily set interpreters quiet */ old_quiet = interp_set_quiet (old_interp, 1); use_quiet = interp_set_quiet (interp_to_use, 1); if (!interp_set (interp_to_use, 0)) error (_("Could not switch to interpreter \"%s\"."), prules[0]); for (i = 1; i < nrules; i++) { struct gdb_exception e = interp_exec (interp_to_use, prules[i]); if (e.reason < 0) { interp_set (old_interp, 0); interp_set_quiet (interp_to_use, use_quiet); interp_set_quiet (old_interp, old_quiet); error (_("error in command: \"%s\"."), prules[i]); } } interp_set (old_interp, 0); interp_set_quiet (interp_to_use, use_quiet); interp_set_quiet (old_interp, old_quiet); } /* List the possible interpreters which could complete the given text. */ static char ** interpreter_completer (struct cmd_list_element *ignore, char *text, char *word) { int alloced = 0; int textlen; int num_matches; char **matches; struct interp *interp; /* We expect only a very limited number of interpreters, so just allocate room for all of them plus one for the last that must be NULL to correctly end the list. */ for (interp = interp_list; interp != NULL; interp = interp->next) ++alloced; matches = (char **) xcalloc (alloced + 1, sizeof (char *)); num_matches = 0; textlen = strlen (text); for (interp = interp_list; interp != NULL; interp = interp->next) { if (strncmp (interp->name, text, textlen) == 0) { matches[num_matches] = (char *) xmalloc (strlen (word) + strlen (interp->name) + 1); if (word == text) strcpy (matches[num_matches], interp->name); else if (word > text) { /* Return some portion of interp->name */ strcpy (matches[num_matches], interp->name + (word - text)); } else { /* Return some of text plus interp->name */ strncpy (matches[num_matches], word, text - word); matches[num_matches][text - word] = '\0'; strcat (matches[num_matches], interp->name); } ++num_matches; } } if (num_matches == 0) { xfree (matches); matches = NULL; } return matches; } struct interp * top_level_interpreter (void) { return top_level_interpreter_ptr; } void * top_level_interpreter_data (void) { gdb_assert (top_level_interpreter_ptr); return top_level_interpreter_ptr->data; } /* This just adds the "interpreter-exec" command. */ void _initialize_interpreter (void) { struct cmd_list_element *c; c = add_cmd ("interpreter-exec", class_support, interpreter_exec_cmd, _("\ Execute a command in an interpreter. It takes two arguments:\n\ The first argument is the name of the interpreter to use.\n\ The second argument is the command to execute.\n"), &cmdlist); set_cmd_completer (c, interpreter_completer); }
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