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Diffstat (limited to 'gdb/top.c')
| -rw-r--r-- | gdb/top.c | 3677 |
1 files changed, 3677 insertions, 0 deletions
diff --git a/gdb/top.c b/gdb/top.c new file mode 100644 index 00000000000..189e3c395ef --- /dev/null +++ b/gdb/top.c @@ -0,0 +1,3677 @@ +/* Top level stuff for GDB, the GNU debugger. + Copyright 1986, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 1998 + Free Software Foundation, 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 2 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, write to the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#include "defs.h" +#include "gdbcmd.h" +#include "call-cmds.h" +#include "symtab.h" +#include "inferior.h" +#include "signals.h" +#include "target.h" +#include "breakpoint.h" +#include "gdbtypes.h" +#include "expression.h" +#include "value.h" +#include "language.h" +#include "terminal.h" /* For job_control. */ +#include "annotate.h" +#include <setjmp.h> +#include "top.h" + +/* readline include files */ +#include <readline/readline.h> +#include <readline/history.h> + +/* readline defines this. */ +#undef savestring + +#include <sys/types.h> +#ifdef HAVE_UNISTD_H +#include <unistd.h> +#endif + +#include "gdb_string.h" +#include "gdb_stat.h" +#include <ctype.h> + +extern void initialize_utils PARAMS ((void)); + +/* Prototypes for local functions */ + +static void dont_repeat_command PARAMS ((char *, int)); + +static void source_cleanup_lines PARAMS ((PTR)); + +static void user_defined_command PARAMS ((char *, int)); + +static void init_signals PARAMS ((void)); + +#ifdef STOP_SIGNAL +static void stop_sig PARAMS ((int)); +#endif + +static char * line_completion_function PARAMS ((char *, int, char *, int)); + +static char * readline_line_completion_function PARAMS ((char *, int)); + +static void command_loop_marker PARAMS ((int)); + +static void while_command PARAMS ((char *, int)); + +static void if_command PARAMS ((char *, int)); + +static struct command_line * +build_command_line PARAMS ((enum command_control_type, char *)); + +static struct command_line * +get_command_line PARAMS ((enum command_control_type, char *)); + +static void realloc_body_list PARAMS ((struct command_line *, int)); + +static enum misc_command_type read_next_line PARAMS ((struct command_line **)); + +static enum command_control_type +recurse_read_control_structure PARAMS ((struct command_line *)); + +static struct cleanup * setup_user_args PARAMS ((char *)); + +static char * locate_arg PARAMS ((char *)); + +static char * insert_args PARAMS ((char *)); + +static void arg_cleanup PARAMS ((void)); + +static void init_main PARAMS ((void)); + +static void init_cmd_lists PARAMS ((void)); + +static void float_handler PARAMS ((int)); + +static void init_signals PARAMS ((void)); + +static void set_verbose PARAMS ((char *, int, struct cmd_list_element *)); + +static void show_history PARAMS ((char *, int)); + +static void set_history PARAMS ((char *, int)); + +static void set_history_size_command PARAMS ((char *, int, + struct cmd_list_element *)); + +static void show_commands PARAMS ((char *, int)); + +static void echo_command PARAMS ((char *, int)); + +static void pwd_command PARAMS ((char *, int)); + +static void show_version PARAMS ((char *, int)); + +static void document_command PARAMS ((char *, int)); + +static void define_command PARAMS ((char *, int)); + +static void validate_comname PARAMS ((char *)); + +static void help_command PARAMS ((char *, int)); + +static void show_command PARAMS ((char *, int)); + +static void info_command PARAMS ((char *, int)); + +static void complete_command PARAMS ((char *, int)); + +static void do_nothing PARAMS ((int)); + +#ifdef SIGHUP +static int quit_cover PARAMS ((PTR)); + +static void disconnect PARAMS ((int)); +#endif + +static void source_cleanup PARAMS ((FILE *)); + +/* If this definition isn't overridden by the header files, assume + that isatty and fileno exist on this system. */ +#ifndef ISATTY +#define ISATTY(FP) (isatty (fileno (FP))) +#endif + +/* Initialization file name for gdb. This is overridden in some configs. */ + +#ifndef GDBINIT_FILENAME +#define GDBINIT_FILENAME ".gdbinit" +#endif +char gdbinit[] = GDBINIT_FILENAME; + +int inhibit_gdbinit = 0; + +/* If nonzero, and GDB has been configured to be able to use windows, + attempt to open them upon startup. */ + +int use_windows = 1; + +/* Version number of GDB, as a string. */ + +extern char *version; + +/* Canonical host name as a string. */ + +extern char *host_name; + +/* Canonical target name as a string. */ + +extern char *target_name; + +extern char lang_frame_mismatch_warn[]; /* language.c */ + +/* Flag for whether we want all the "from_tty" gubbish printed. */ + +int caution = 1; /* Default is yes, sigh. */ + +/* Define all cmd_list_elements. */ + +/* Chain containing all defined commands. */ + +struct cmd_list_element *cmdlist; + +/* Chain containing all defined info subcommands. */ + +struct cmd_list_element *infolist; + +/* Chain containing all defined enable subcommands. */ + +struct cmd_list_element *enablelist; + +/* Chain containing all defined disable subcommands. */ + +struct cmd_list_element *disablelist; + +/* Chain containing all defined toggle subcommands. */ + +struct cmd_list_element *togglelist; + +/* Chain containing all defined stop subcommands. */ + +struct cmd_list_element *stoplist; + +/* Chain containing all defined delete subcommands. */ + +struct cmd_list_element *deletelist; + +/* Chain containing all defined "enable breakpoint" subcommands. */ + +struct cmd_list_element *enablebreaklist; + +/* Chain containing all defined set subcommands */ + +struct cmd_list_element *setlist; + +/* Chain containing all defined unset subcommands */ + +struct cmd_list_element *unsetlist; + +/* Chain containing all defined show subcommands. */ + +struct cmd_list_element *showlist; + +/* Chain containing all defined \"set history\". */ + +struct cmd_list_element *sethistlist; + +/* Chain containing all defined \"show history\". */ + +struct cmd_list_element *showhistlist; + +/* Chain containing all defined \"unset history\". */ + +struct cmd_list_element *unsethistlist; + +/* Chain containing all defined maintenance subcommands. */ + +#if MAINTENANCE_CMDS +struct cmd_list_element *maintenancelist; +#endif + +/* Chain containing all defined "maintenance info" subcommands. */ + +#if MAINTENANCE_CMDS +struct cmd_list_element *maintenanceinfolist; +#endif + +/* Chain containing all defined "maintenance print" subcommands. */ + +#if MAINTENANCE_CMDS +struct cmd_list_element *maintenanceprintlist; +#endif + +struct cmd_list_element *setprintlist; + +struct cmd_list_element *showprintlist; + +struct cmd_list_element *setchecklist; + +struct cmd_list_element *showchecklist; + +/* stdio stream that command input is being read from. Set to stdin normally. + Set by source_command to the file we are sourcing. Set to NULL if we are + executing a user-defined command or interacting via a GUI. */ + +FILE *instream; + +/* Current working directory. */ + +char *current_directory; + +/* The directory name is actually stored here (usually). */ +char gdb_dirbuf[1024]; + +/* Function to call before reading a command, if nonzero. + The function receives two args: an input stream, + and a prompt string. */ + +void (*window_hook) PARAMS ((FILE *, char *)); + +int epoch_interface; +int xgdb_verbose; + +/* gdb prints this when reading a command interactively */ +static char *prompt; + +/* Buffer used for reading command lines, and the size + allocated for it so far. */ + +char *line; +int linesize = 100; + +/* Nonzero if the current command is modified by "server ". This + affects things like recording into the command history, comamnds + repeating on RETURN, etc. This is so a user interface (emacs, GUI, + whatever) can issue its own commands and also send along commands + from the user, and have the user not notice that the user interface + is issuing commands too. */ +int server_command; + +/* Baud rate specified for talking to serial target systems. Default + is left as -1, so targets can choose their own defaults. */ +/* FIXME: This means that "show remotebaud" and gr_files_info can print -1 + or (unsigned int)-1. This is a Bad User Interface. */ + +int baud_rate = -1; + +/* Timeout limit for response from target. */ + +int remote_timeout = 20; /* Set default to 20 */ + +/* Non-zero tells remote* modules to output debugging info. */ + +int remote_debug = 0; + +/* Level of control structure. */ +static int control_level; + +/* Structure for arguments to user defined functions. */ +#define MAXUSERARGS 10 +struct user_args +{ + struct user_args *next; + struct + { + char *arg; + int len; + } a[MAXUSERARGS]; + int count; +} *user_args; + +/* Signal to catch ^Z typed while reading a command: SIGTSTP or SIGCONT. */ + +#ifndef STOP_SIGNAL +#ifdef SIGTSTP +#define STOP_SIGNAL SIGTSTP +static void stop_sig PARAMS ((int)); +#endif +#endif + +/* Some System V have job control but not sigsetmask(). */ +#if !defined (HAVE_SIGSETMASK) +#if !defined (USG) +#define HAVE_SIGSETMASK 1 +#else +#define HAVE_SIGSETMASK 0 +#endif +#endif + +#if 0 == (HAVE_SIGSETMASK) +#define sigsetmask(n) +#endif + +/* Hooks for alternate command interfaces. */ + +/* Called after most modules have been initialized, but before taking users + command file. */ + +void (*init_ui_hook) PARAMS ((char *argv0)); +#ifdef __CYGWIN32__ +void (*ui_loop_hook) PARAMS ((int)); +#endif + +/* Called instead of command_loop at top level. Can be invoked via + return_to_top_level. */ + +void (*command_loop_hook) PARAMS ((void)); + + +/* Called instead of fputs for all output. */ + +void (*fputs_unfiltered_hook) PARAMS ((const char *linebuffer, GDB_FILE *stream)); + +/* Called when the target says something to the host, which may + want to appear in a different window. */ + +void (*target_output_hook) PARAMS ((char *)); + +/* Called from print_frame_info to list the line we stopped in. */ + +void (*print_frame_info_listing_hook) PARAMS ((struct symtab *s, int line, + int stopline, int noerror)); +/* Replaces most of query. */ + +int (*query_hook) PARAMS ((const char *, va_list)); + +/* Replaces most of warning. */ + +void (*warning_hook) PARAMS ((const char *, va_list)); + +/* Called from gdb_flush to flush output. */ + +void (*flush_hook) PARAMS ((GDB_FILE *stream)); + +/* These three functions support getting lines of text from the user. They + are used in sequence. First readline_begin_hook is called with a text + string that might be (for example) a message for the user to type in a + sequence of commands to be executed at a breakpoint. If this function + calls back to a GUI, it might take this opportunity to pop up a text + interaction window with this message. Next, readline_hook is called + with a prompt that is emitted prior to collecting the user input. + It can be called multiple times. Finally, readline_end_hook is called + to notify the GUI that we are done with the interaction window and it + can close it. */ + +void (*readline_begin_hook) PARAMS ((char *, ...)); +char * (*readline_hook) PARAMS ((char *)); +void (*readline_end_hook) PARAMS ((void)); + +/* Called as appropriate to notify the interface of the specified breakpoint + conditions. */ + +void (*create_breakpoint_hook) PARAMS ((struct breakpoint *bpt)); +void (*delete_breakpoint_hook) PARAMS ((struct breakpoint *bpt)); +void (*modify_breakpoint_hook) PARAMS ((struct breakpoint *bpt)); + +/* Called during long calculations to allow GUI to repair window damage, and to + check for stop buttons, etc... */ + +void (*interactive_hook) PARAMS ((void)); + +/* Called when the registers have changed, as a hint to a GUI + to minimize window update. */ + +void (*registers_changed_hook) PARAMS ((void)); + +/* Tell the GUI someone changed the register REGNO. -1 means + that the caller does not know which register changed or + that several registers have changed (see value_assign).*/ +void (*register_changed_hook) PARAMS ((int regno)); + +/* Tell the GUI someone changed LEN bytes of memory at ADDR */ +void (*memory_changed_hook) PARAMS ((CORE_ADDR addr, int len)); + +/* Called when going to wait for the target. Usually allows the GUI to run + while waiting for target events. */ + +int (*target_wait_hook) PARAMS ((int pid, struct target_waitstatus *status)); + +/* Used by UI as a wrapper around command execution. May do various things + like enabling/disabling buttons, etc... */ + +void (*call_command_hook) PARAMS ((struct cmd_list_element *c, char *cmd, + int from_tty)); + +/* Called when the current thread changes. Argument is thread id. */ + +void (*context_hook) PARAMS ((int id)); + +/* Takes control from error (). Typically used to prevent longjmps out of the + middle of the GUI. Usually used in conjunction with a catch routine. */ + +NORETURN void (*error_hook) PARAMS ((void)) ATTR_NORETURN; + + +/* Where to go for return_to_top_level (RETURN_ERROR). */ +SIGJMP_BUF error_return; +/* Where to go for return_to_top_level (RETURN_QUIT). */ +SIGJMP_BUF quit_return; + +/* Return for reason REASON. This generally gets back to the command + loop, but can be caught via catch_errors. */ + +NORETURN void +return_to_top_level (reason) + enum return_reason reason; +{ + quit_flag = 0; + immediate_quit = 0; + + /* Perhaps it would be cleaner to do this via the cleanup chain (not sure + I can think of a reason why that is vital, though). */ + bpstat_clear_actions(stop_bpstat); /* Clear queued breakpoint commands */ + + disable_current_display (); + do_cleanups (ALL_CLEANUPS); + + if (annotation_level > 1) + switch (reason) + { + case RETURN_QUIT: + annotate_quit (); + break; + case RETURN_ERROR: + annotate_error (); + break; + } + + (NORETURN void) SIGLONGJMP + (reason == RETURN_ERROR ? error_return : quit_return, 1); +} + +/* Call FUNC with arg ARGS, catching any errors. If there is no + error, return the value returned by FUNC. If there is an error, + print ERRSTRING, print the specific error message, then return + zero. + + Must not be called with immediate_quit in effect (bad things might + happen, say we got a signal in the middle of a memcpy to quit_return). + This is an OK restriction; with very few exceptions immediate_quit can + be replaced by judicious use of QUIT. + + MASK specifies what to catch; it is normally set to + RETURN_MASK_ALL, if for no other reason than that the code which + calls catch_errors might not be set up to deal with a quit which + isn't caught. But if the code can deal with it, it generally + should be RETURN_MASK_ERROR, unless for some reason it is more + useful to abort only the portion of the operation inside the + catch_errors. Note that quit should return to the command line + fairly quickly, even if some further processing is being done. */ + +int +catch_errors (func, args, errstring, mask) + catch_errors_ftype *func; + PTR args; + char *errstring; + return_mask mask; +{ + SIGJMP_BUF saved_error; + SIGJMP_BUF saved_quit; + SIGJMP_BUF tmp_jmp; + int val; + struct cleanup *saved_cleanup_chain; + char *saved_error_pre_print; + char *saved_quit_pre_print; + + saved_cleanup_chain = save_cleanups (); + saved_error_pre_print = error_pre_print; + saved_quit_pre_print = quit_pre_print; + + if (mask & RETURN_MASK_ERROR) + { + memcpy ((char *)saved_error, (char *)error_return, sizeof (SIGJMP_BUF)); + error_pre_print = errstring; + } + if (mask & RETURN_MASK_QUIT) + { + memcpy (saved_quit, quit_return, sizeof (SIGJMP_BUF)); + quit_pre_print = errstring; + } + + if (SIGSETJMP (tmp_jmp) == 0) + { + if (mask & RETURN_MASK_ERROR) + memcpy (error_return, tmp_jmp, sizeof (SIGJMP_BUF)); + if (mask & RETURN_MASK_QUIT) + memcpy (quit_return, tmp_jmp, sizeof (SIGJMP_BUF)); + val = (*func) (args); + } + else + val = 0; + + restore_cleanups (saved_cleanup_chain); + + if (mask & RETURN_MASK_ERROR) + { + memcpy (error_return, saved_error, sizeof (SIGJMP_BUF)); + error_pre_print = saved_error_pre_print; + } + if (mask & RETURN_MASK_QUIT) + { + memcpy (quit_return, saved_quit, sizeof (SIGJMP_BUF)); + quit_pre_print = saved_quit_pre_print; + } + return val; +} + +/* Handler for SIGHUP. */ + +#ifdef SIGHUP +static void +disconnect (signo) +int signo; +{ + catch_errors (quit_cover, NULL, + "Could not kill the program being debugged", RETURN_MASK_ALL); + signal (SIGHUP, SIG_DFL); + kill (getpid (), SIGHUP); +} + +/* Just a little helper function for disconnect(). */ + +static int +quit_cover (s) + PTR s; +{ + caution = 0; /* Throw caution to the wind -- we're exiting. + This prevents asking the user dumb questions. */ + quit_command((char *)0, 0); + return 0; +} +#endif /* defined SIGHUP */ + +/* Line number we are currently in in a file which is being sourced. */ +static int source_line_number; + +/* Name of the file we are sourcing. */ +static char *source_file_name; + +/* Buffer containing the error_pre_print used by the source stuff. + Malloc'd. */ +static char *source_error; +static int source_error_allocated; + +/* Something to glom on to the start of error_pre_print if source_file_name + is set. */ +static char *source_pre_error; + +/* Clean up on error during a "source" command (or execution of a + user-defined command). */ + +static void +source_cleanup (stream) + FILE *stream; +{ + /* Restore the previous input stream. */ + instream = stream; +} + +/* Read commands from STREAM. */ +void +read_command_file (stream) + FILE *stream; +{ + struct cleanup *cleanups; + + cleanups = make_cleanup ((make_cleanup_func) source_cleanup, instream); + instream = stream; + command_loop (); + do_cleanups (cleanups); +} + +extern void init_proc PARAMS ((void)); + +void (*pre_init_ui_hook) PARAMS ((void)); + +void +gdb_init (argv0) + char *argv0; +{ + if (pre_init_ui_hook) + pre_init_ui_hook (); + + /* Run the init function of each source file */ + + getcwd (gdb_dirbuf, sizeof (gdb_dirbuf)); + current_directory = gdb_dirbuf; + + init_cmd_lists (); /* This needs to be done first */ + initialize_targets (); /* Setup target_terminal macros for utils.c */ + initialize_utils (); /* Make errors and warnings possible */ + initialize_all_files (); + init_main (); /* But that omits this file! Do it now */ + init_signals (); + + init_proc (); + + /* We need a default language for parsing expressions, so simple things like + "set width 0" won't fail if no language is explicitly set in a config file + or implicitly set by reading an executable during startup. */ + set_language (language_c); + expected_language = current_language; /* don't warn about the change. */ + + if (init_ui_hook) + init_ui_hook (argv0); +} + +/* Allocate, initialize a new command line structure for one of the + control commands (if/while). */ + +static struct command_line * +build_command_line (type, args) + enum command_control_type type; + char *args; +{ + struct command_line *cmd; + + if (args == NULL) + error ("if/while commands require arguments.\n"); + + cmd = (struct command_line *)xmalloc (sizeof (struct command_line)); + cmd->next = NULL; + cmd->control_type = type; + + cmd->body_count = 1; + cmd->body_list + = (struct command_line **)xmalloc (sizeof (struct command_line *) + * cmd->body_count); + memset (cmd->body_list, 0, sizeof (struct command_line *) * cmd->body_count); + cmd->line = savestring (args, strlen (args)); + return cmd; +} + +/* Build and return a new command structure for the control commands + such as "if" and "while". */ + +static struct command_line * +get_command_line (type, arg) + enum command_control_type type; + char *arg; +{ + struct command_line *cmd; + struct cleanup *old_chain = NULL; + + /* Allocate and build a new command line structure. */ + cmd = build_command_line (type, arg); + + old_chain = make_cleanup ((make_cleanup_func) free_command_lines, &cmd); + + /* Read in the body of this command. */ + if (recurse_read_control_structure (cmd) == invalid_control) + { + warning ("error reading in control structure\n"); + do_cleanups (old_chain); + return NULL; + } + + discard_cleanups (old_chain); + return cmd; +} + +/* Recursively print a command (including full control structures). */ +void +print_command_line (cmd, depth) + struct command_line *cmd; + unsigned int depth; +{ + unsigned int i; + + if (depth) + { + for (i = 0; i < depth; i++) + fputs_filtered (" ", gdb_stdout); + } + + /* A simple command, print it and return. */ + if (cmd->control_type == simple_control) + { + fputs_filtered (cmd->line, gdb_stdout); + fputs_filtered ("\n", gdb_stdout); + return; + } + + /* loop_continue to jump to the start of a while loop, print it + and return. */ + if (cmd->control_type == continue_control) + { + fputs_filtered ("loop_continue\n", gdb_stdout); + return; + } + + /* loop_break to break out of a while loop, print it and return. */ + if (cmd->control_type == break_control) + { + fputs_filtered ("loop_break\n", gdb_stdout); + return; + } + + /* A while command. Recursively print its subcommands before returning. */ + if (cmd->control_type == while_control) + { + struct command_line *list; + fputs_filtered ("while ", gdb_stdout); + fputs_filtered (cmd->line, gdb_stdout); + fputs_filtered ("\n", gdb_stdout); + list = *cmd->body_list; + while (list) + { + print_command_line (list, depth + 1); + list = list->next; + } + } + + /* An if command. Recursively print both arms before returning. */ + if (cmd->control_type == if_control) + { + fputs_filtered ("if ", gdb_stdout); + fputs_filtered (cmd->line, gdb_stdout); + fputs_filtered ("\n", gdb_stdout); + /* The true arm. */ + print_command_line (cmd->body_list[0], depth + 1); + + /* Show the false arm if it exists. */ + if (cmd->body_count == 2) + { + if (depth) + { + for (i = 0; i < depth; i++) + fputs_filtered (" ", gdb_stdout); + } + fputs_filtered ("else\n", gdb_stdout); + print_command_line (cmd->body_list[1], depth + 1); + } + if (depth) + { + for (i = 0; i < depth; i++) + fputs_filtered (" ", gdb_stdout); + } + fputs_filtered ("end\n", gdb_stdout); + } +} + +/* Execute the command in CMD. */ + +enum command_control_type +execute_control_command (cmd) + struct command_line *cmd; +{ + struct expression *expr; + struct command_line *current; + struct cleanup *old_chain = 0; + value_ptr val; + value_ptr val_mark; + int loop; + enum command_control_type ret; + char *new_line; + + switch (cmd->control_type) + { + case simple_control: + /* A simple command, execute it and return. */ + new_line = insert_args (cmd->line); + if (!new_line) + return invalid_control; + old_chain = make_cleanup ((make_cleanup_func) free_current_contents, + &new_line); + execute_command (new_line, 0); + ret = cmd->control_type; + break; + + case continue_control: + case break_control: + /* Return for "continue", and "break" so we can either + continue the loop at the top, or break out. */ + ret = cmd->control_type; + break; + + case while_control: + { + /* Parse the loop control expression for the while statement. */ + new_line = insert_args (cmd->line); + if (!new_line) + return invalid_control; + old_chain = make_cleanup ((make_cleanup_func) free_current_contents, + &new_line); + expr = parse_expression (new_line); + make_cleanup ((make_cleanup_func) free_current_contents, &expr); + + ret = simple_control; + loop = 1; + + /* Keep iterating so long as the expression is true. */ + while (loop == 1) + { + int cond_result; + + QUIT; + + /* Evaluate the expression. */ + val_mark = value_mark (); + val = evaluate_expression (expr); + cond_result = value_true (val); + value_free_to_mark (val_mark); + + /* If the value is false, then break out of the loop. */ + if (!cond_result) + break; + + /* Execute the body of the while statement. */ + current = *cmd->body_list; + while (current) + { + ret = execute_control_command (current); + + /* If we got an error, or a "break" command, then stop + looping. */ + if (ret == invalid_control || ret == break_control) + { + loop = 0; + break; + } + + /* If we got a "continue" command, then restart the loop + at this point. */ + if (ret == continue_control) + break; + + /* Get the next statement. */ + current = current->next; + } + } + + /* Reset RET so that we don't recurse the break all the way down. */ + if (ret == break_control) + ret = simple_control; + + break; + } + + case if_control: + { + new_line = insert_args (cmd->line); + if (!new_line) + return invalid_control; + old_chain = make_cleanup ((make_cleanup_func) free_current_contents, + &new_line); + /* Parse the conditional for the if statement. */ + expr = parse_expression (new_line); + make_cleanup ((make_cleanup_func) free_current_contents, &expr); + + current = NULL; + ret = simple_control; + + /* Evaluate the conditional. */ + val_mark = value_mark (); + val = evaluate_expression (expr); + + /* Choose which arm to take commands from based on the value of the + conditional expression. */ + if (value_true (val)) + current = *cmd->body_list; + else if (cmd->body_count == 2) + current = *(cmd->body_list + 1); + value_free_to_mark (val_mark); + + /* Execute commands in the given arm. */ + while (current) + { + ret = execute_control_command (current); + + /* If we got an error, get out. */ + if (ret != simple_control) + break; + + /* Get the next statement in the body. */ + current = current->next; + } + + break; + } + + default: + warning ("Invalid control type in command structure."); + return invalid_control; + } + + if (old_chain) + do_cleanups (old_chain); + + return ret; +} + +/* "while" command support. Executes a body of statements while the + loop condition is nonzero. */ + +static void +while_command (arg, from_tty) + char *arg; + int from_tty; +{ + struct command_line *command = NULL; + + control_level = 1; + command = get_command_line (while_control, arg); + + if (command == NULL) + return; + + execute_control_command (command); + free_command_lines (&command); +} + +/* "if" command support. Execute either the true or false arm depending + on the value of the if conditional. */ + +static void +if_command (arg, from_tty) + char *arg; + int from_tty; +{ + struct command_line *command = NULL; + + control_level = 1; + command = get_command_line (if_control, arg); + + if (command == NULL) + return; + + execute_control_command (command); + free_command_lines (&command); +} + +/* Cleanup */ +static void +arg_cleanup () +{ + struct user_args *oargs = user_args; + if (!user_args) + fatal ("Internal error, arg_cleanup called with no user args.\n"); + + user_args = user_args->next; + free (oargs); +} + +/* Bind the incomming arguments for a user defined command to + $arg0, $arg1 ... $argMAXUSERARGS. */ + +static struct cleanup * +setup_user_args (p) + char *p; +{ + struct user_args *args; + struct cleanup *old_chain; + unsigned int arg_count = 0; + + args = (struct user_args *)xmalloc (sizeof (struct user_args)); + memset (args, 0, sizeof (struct user_args)); + + args->next = user_args; + user_args = args; + + old_chain = make_cleanup ((make_cleanup_func) arg_cleanup, 0); + + if (p == NULL) + return old_chain; + + while (*p) + { + char *start_arg; + int squote = 0; + int dquote = 0; + int bsquote = 0; + + if (arg_count >= MAXUSERARGS) + { + error ("user defined function may only have %d arguments.\n", + MAXUSERARGS); + return old_chain; + } + + /* Strip whitespace. */ + while (*p == ' ' || *p == '\t') + p++; + + /* P now points to an argument. */ + start_arg = p; + user_args->a[arg_count].arg = p; + + /* Get to the end of this argument. */ + while (*p) + { + if (((*p == ' ' || *p == '\t')) && !squote && !dquote && !bsquote) + break; + else + { + if (bsquote) + bsquote = 0; + else if (*p == '\\') + bsquote = 1; + else if (squote) + { + if (*p == '\'') + squote = 0; + } + else if (dquote) + { + if (*p == '"') + dquote = 0; + } + else + { + if (*p == '\'') + squote = 1; + else if (*p == '"') + dquote = 1; + } + p++; + } + } + + user_args->a[arg_count].len = p - start_arg; + arg_count++; + user_args->count++; + } + return old_chain; +} + +/* Given character string P, return a point to the first argument ($arg), + or NULL if P contains no arguments. */ + +static char * +locate_arg (p) + char *p; +{ + while ((p = strchr (p, '$'))) + { + if (strncmp (p, "$arg", 4) == 0 && isdigit (p[4])) + return p; + p++; + } + return NULL; +} + +/* Insert the user defined arguments stored in user_arg into the $arg + arguments found in line, with the updated copy being placed into nline. */ + +static char * +insert_args (line) + char *line; +{ + char *p, *save_line, *new_line; + unsigned len, i; + + /* First we need to know how much memory to allocate for the new line. */ + save_line = line; + len = 0; + while ((p = locate_arg (line))) + { + len += p - line; + i = p[4] - '0'; + + if (i >= user_args->count) + { + error ("Missing argument %d in user function.\n", i); + return NULL; + } + len += user_args->a[i].len; + line = p + 5; + } + + /* Don't forget the tail. */ + len += strlen (line); + + /* Allocate space for the new line and fill it in. */ + new_line = (char *)xmalloc (len + 1); + if (new_line == NULL) + return NULL; + + /* Restore pointer to beginning of old line. */ + line = save_line; + + /* Save pointer to beginning of new line. */ + save_line = new_line; + + while ((p = locate_arg (line))) + { + int i, len; + + memcpy (new_line, line, p - line); + new_line += p - line; + i = p[4] - '0'; + + len = user_args->a[i].len; + if (len) + { + memcpy (new_line, user_args->a[i].arg, len); + new_line += len; + } + line = p + 5; + } + /* Don't forget the tail. */ + strcpy (new_line, line); + + /* Return a pointer to the beginning of the new line. */ + return save_line; +} + +void +execute_user_command (c, args) + struct cmd_list_element *c; + char *args; +{ + register struct command_line *cmdlines; + struct cleanup *old_chain; + enum command_control_type ret; + + old_chain = setup_user_args (args); + + cmdlines = c->user_commands; + if (cmdlines == 0) + /* Null command */ + return; + + /* Set the instream to 0, indicating execution of a + user-defined function. */ + old_chain = make_cleanup ((make_cleanup_func) source_cleanup, instream); + instream = (FILE *) 0; + while (cmdlines) + { + ret = execute_control_command (cmdlines); + if (ret != simple_control && ret != break_control) + { + warning ("Error in control structure.\n"); + break; + } + cmdlines = cmdlines->next; + } + do_cleanups (old_chain); +} + +/* Execute the line P as a command. + Pass FROM_TTY as second argument to the defining function. */ + +void +execute_command (p, from_tty) + char *p; + int from_tty; +{ + register struct cmd_list_element *c; + register enum language flang; + static int warned = 0; + /* FIXME: These should really be in an appropriate header file */ + extern void serial_log_command PARAMS ((const char *)); + + free_all_values (); + + /* Force cleanup of any alloca areas if using C alloca instead of + a builtin alloca. */ + alloca (0); + + /* This can happen when command_line_input hits end of file. */ + if (p == NULL) + return; + + serial_log_command (p); + + while (*p == ' ' || *p == '\t') p++; + if (*p) + { + char *arg; + + c = lookup_cmd (&p, cmdlist, "", 0, 1); + /* Pass null arg rather than an empty one. */ + arg = *p ? p : 0; + + /* Clear off trailing whitespace, except for set and complete command. */ + if (arg && c->type != set_cmd && c->function.cfunc != complete_command) + { + p = arg + strlen (arg) - 1; + while (p >= arg && (*p == ' ' || *p == '\t')) + p--; + *(p + 1) = '\0'; + } + + /* If this command has been hooked, run the hook first. */ + if (c->hook) + execute_user_command (c->hook, (char *)0); + + if (c->class == class_user) + execute_user_command (c, arg); + else if (c->type == set_cmd || c->type == show_cmd) + do_setshow_command (arg, from_tty & caution, c); + else if (c->function.cfunc == NO_FUNCTION) + error ("That is not a command, just a help topic."); + else if (call_command_hook) + call_command_hook (c, arg, from_tty & caution); + else + (*c->function.cfunc) (arg, from_tty & caution); + } + + /* Tell the user if the language has changed (except first time). */ + if (current_language != expected_language) + { + if (language_mode == language_mode_auto) { + language_info (1); /* Print what changed. */ + } + warned = 0; + } + + /* Warn the user if the working language does not match the + language of the current frame. Only warn the user if we are + actually running the program, i.e. there is a stack. */ + /* FIXME: This should be cacheing the frame and only running when + the frame changes. */ + + if (target_has_stack) + { + flang = get_frame_language (); + if (!warned + && flang != language_unknown + && flang != current_language->la_language) + { + printf_filtered ("%s\n", lang_frame_mismatch_warn); + warned = 1; + } + } +} + +/* ARGSUSED */ +static void +command_loop_marker (foo) + int foo; +{ +} + +/* Read commands from `instream' and execute them + until end of file or error reading instream. */ + +void +command_loop () +{ + struct cleanup *old_chain; + char *command; + int stdin_is_tty = ISATTY (stdin); + long time_at_cmd_start; +#ifdef HAVE_SBRK + long space_at_cmd_start = 0; +#endif + extern int display_time; + extern int display_space; + + while (instream && !feof (instream)) + { +#if defined(TUI) + extern int insert_mode; +#endif + if (window_hook && instream == stdin) + (*window_hook) (instream, prompt); + + quit_flag = 0; + if (instream == stdin && stdin_is_tty) + reinitialize_more_filter (); + old_chain = make_cleanup ((make_cleanup_func) command_loop_marker, 0); + +#if defined(TUI) + /* A bit of paranoia: I want to make sure the "insert_mode" global + * is clear except when it is being used for command-line editing + * (see tuiIO.c, utils.c); otherwise normal output will + * get messed up in the TUI. So clear it before/after + * the command-line-input call. - RT + */ + insert_mode = 0; +#endif + /* Get a command-line. This calls the readline package. */ + command = command_line_input (instream == stdin ? prompt : (char *) NULL, + instream == stdin, "prompt"); +#if defined(TUI) + insert_mode = 0; +#endif + if (command == 0) + return; + + time_at_cmd_start = get_run_time (); + + if (display_space) + { +#ifdef HAVE_SBRK + extern char **environ; + char *lim = (char *) sbrk (0); + + space_at_cmd_start = (long) (lim - (char *) &environ); +#endif + } + + execute_command (command, instream == stdin); + /* Do any commands attached to breakpoint we stopped at. */ + bpstat_do_actions (&stop_bpstat); + do_cleanups (old_chain); + + if (display_time) + { + long cmd_time = get_run_time () - time_at_cmd_start; + + printf_unfiltered ("Command execution time: %ld.%06ld\n", + cmd_time / 1000000, cmd_time % 1000000); + } + + if (display_space) + { +#ifdef HAVE_SBRK + extern char **environ; + char *lim = (char *) sbrk (0); + long space_now = lim - (char *) &environ; + long space_diff = space_now - space_at_cmd_start; + + printf_unfiltered ("Space used: %ld (%c%ld for this command)\n", + space_now, + (space_diff >= 0 ? '+' : '-'), + space_diff); +#endif + } + } +} + +/* Commands call this if they do not want to be repeated by null lines. */ + +void +dont_repeat () +{ + if (server_command) + return; + + /* If we aren't reading from standard input, we are saving the last + thing read from stdin in line and don't want to delete it. Null lines + won't repeat here in any case. */ + if (instream == stdin) + *line = 0; +} + +/* Read a line from the stream "instream" without command line editing. + + It prints PRROMPT once at the start. + Action is compatible with "readline", e.g. space for the result is + malloc'd and should be freed by the caller. + + A NULL return means end of file. */ +char * +gdb_readline (prrompt) + char *prrompt; +{ + int c; + char *result; + int input_index = 0; + int result_size = 80; + + if (prrompt) + { + /* Don't use a _filtered function here. It causes the assumed + character position to be off, since the newline we read from + the user is not accounted for. */ + fputs_unfiltered (prrompt, gdb_stdout); +#ifdef MPW + /* Move to a new line so the entered line doesn't have a prompt + on the front of it. */ + fputs_unfiltered ("\n", gdb_stdout); +#endif /* MPW */ + gdb_flush (gdb_stdout); + } + + result = (char *) xmalloc (result_size); + + while (1) + { + /* Read from stdin if we are executing a user defined command. + This is the right thing for prompt_for_continue, at least. */ + c = fgetc (instream ? instream : stdin); + + if (c == EOF) + { + if (input_index > 0) + /* The last line does not end with a newline. Return it, and + if we are called again fgetc will still return EOF and + we'll return NULL then. */ + break; + free (result); + return NULL; + } + + if (c == '\n') +#ifndef CRLF_SOURCE_FILES + break; +#else + { + if (input_index > 0 && result[input_index - 1] == '\r') + input_index--; + break; + } +#endif + + result[input_index++] = c; + while (input_index >= result_size) + { + result_size *= 2; + result = (char *) xrealloc (result, result_size); + } + } + + result[input_index++] = '\0'; + return result; +} + +/* Variables which control command line editing and history + substitution. These variables are given default values at the end + of this file. */ +static int command_editing_p; +static int history_expansion_p; +static int write_history_p; +static int history_size; +static char *history_filename; + +/* readline uses the word breaks for two things: + (1) In figuring out where to point the TEXT parameter to the + rl_completion_entry_function. Since we don't use TEXT for much, + it doesn't matter a lot what the word breaks are for this purpose, but + it does affect how much stuff M-? lists. + (2) If one of the matches contains a word break character, readline + will quote it. That's why we switch between + gdb_completer_word_break_characters and + gdb_completer_command_word_break_characters. I'm not sure when + we need this behavior (perhaps for funky characters in C++ symbols?). */ + +/* Variables which are necessary for fancy command line editing. */ +char *gdb_completer_word_break_characters = + " \t\n!@#$%^&*()+=|~`}{[]\"';:?/>.<,-"; + +/* When completing on command names, we remove '-' from the list of + word break characters, since we use it in command names. If the + readline library sees one in any of the current completion strings, + it thinks that the string needs to be quoted and automatically supplies + a leading quote. */ +char *gdb_completer_command_word_break_characters = + " \t\n!@#$%^&*()+=|~`}{[]\"';:?/>.<,"; + +/* Characters that can be used to quote completion strings. Note that we + can't include '"' because the gdb C parser treats such quoted sequences + as strings. */ +char *gdb_completer_quote_characters = + "'"; + +/* Functions that are used as part of the fancy command line editing. */ + +/* This can be used for functions which don't want to complete on symbols + but don't want to complete on anything else either. */ +/* ARGSUSED */ +char ** +noop_completer (text, prefix) + char *text; + char *prefix; +{ + return NULL; +} + +/* Complete on filenames. */ +char ** +filename_completer (text, word) + char *text; + char *word; +{ + /* From readline. */ + extern char *filename_completion_function PARAMS ((char *, int)); + int subsequent_name; + char **return_val; + int return_val_used; + int return_val_alloced; + + return_val_used = 0; + /* Small for testing. */ + return_val_alloced = 1; + return_val = (char **) xmalloc (return_val_alloced * sizeof (char *)); + + subsequent_name = 0; + while (1) + { + char *p; + p = filename_completion_function (text, subsequent_name); + if (return_val_used >= return_val_alloced) + { + return_val_alloced *= 2; + return_val = + (char **) xrealloc (return_val, + return_val_alloced * sizeof (char *)); + } + if (p == NULL) + { + return_val[return_val_used++] = p; + break; + } + /* Like emacs, don't complete on old versions. Especially useful + in the "source" command. */ + if (p[strlen (p) - 1] == '~') + continue; + + { + char *q; + if (word == text) + /* Return exactly p. */ + return_val[return_val_used++] = p; + else if (word > text) + { + /* Return some portion of p. */ + q = xmalloc (strlen (p) + 5); + strcpy (q, p + (word - text)); + return_val[return_val_used++] = q; + free (p); + } + else + { + /* Return some of TEXT plus p. */ + q = xmalloc (strlen (p) + (text - word) + 5); + strncpy (q, word, text - word); + q[text - word] = '\0'; + strcat (q, p); + return_val[return_val_used++] = q; + free (p); + } + } + subsequent_name = 1; + } +#if 0 + /* There is no way to do this just long enough to affect quote inserting + without also affecting the next completion. This should be fixed in + readline. FIXME. */ + /* Insure that readline does the right thing + with respect to inserting quotes. */ + rl_completer_word_break_characters = ""; +#endif + return return_val; +} + +/* Here are some useful test cases for completion. FIXME: These should + be put in the test suite. They should be tested with both M-? and TAB. + + "show output-" "radix" + "show output" "-radix" + "p" ambiguous (commands starting with p--path, print, printf, etc.) + "p " ambiguous (all symbols) + "info t foo" no completions + "info t " no completions + "info t" ambiguous ("info target", "info terminal", etc.) + "info ajksdlfk" no completions + "info ajksdlfk " no completions + "info" " " + "info " ambiguous (all info commands) + "p \"a" no completions (string constant) + "p 'a" ambiguous (all symbols starting with a) + "p b-a" ambiguous (all symbols starting with a) + "p b-" ambiguous (all symbols) + "file Make" "file" (word break hard to screw up here) + "file ../gdb.stabs/we" "ird" (needs to not break word at slash) + */ + +/* Generate completions one by one for the completer. Each time we are + called return another potential completion to the caller. + line_completion just completes on commands or passes the buck to the + command's completer function, the stuff specific to symbol completion + is in make_symbol_completion_list. + + TEXT is the caller's idea of the "word" we are looking at. + + MATCHES is the number of matches that have currently been collected from + calling this completion function. When zero, then we need to initialize, + otherwise the initialization has already taken place and we can just + return the next potential completion string. + + LINE_BUFFER is available to be looked at; it contains the entire text + of the line. POINT is the offset in that line of the cursor. You + should pretend that the line ends at POINT. + + Returns NULL if there are no more completions, else a pointer to a string + which is a possible completion, it is the caller's responsibility to + free the string. */ + +static char * +line_completion_function (text, matches, line_buffer, point) + char *text; + int matches; + char *line_buffer; + int point; +{ + static char **list = (char **)NULL; /* Cache of completions */ + static int index; /* Next cached completion */ + char *output = NULL; + char *tmp_command, *p; + /* Pointer within tmp_command which corresponds to text. */ + char *word; + struct cmd_list_element *c, *result_list; + + if (matches == 0) + { + /* The caller is beginning to accumulate a new set of completions, so + we need to find all of them now, and cache them for returning one at + a time on future calls. */ + + if (list) + { + /* Free the storage used by LIST, but not by the strings inside. + This is because rl_complete_internal () frees the strings. */ + free ((PTR)list); + } + list = 0; + index = 0; + + /* Choose the default set of word break characters to break completions. + If we later find out that we are doing completions on command strings + (as opposed to strings supplied by the individual command completer + functions, which can be any string) then we will switch to the + special word break set for command strings, which leaves out the + '-' character used in some commands. */ + + rl_completer_word_break_characters = + gdb_completer_word_break_characters; + + /* Decide whether to complete on a list of gdb commands or on symbols. */ + tmp_command = (char *) alloca (point + 1); + p = tmp_command; + + strncpy (tmp_command, line_buffer, point); + tmp_command[point] = '\0'; + /* Since text always contains some number of characters leading up + to point, we can find the equivalent position in tmp_command + by subtracting that many characters from the end of tmp_command. */ + word = tmp_command + point - strlen (text); + + if (point == 0) + { + /* An empty line we want to consider ambiguous; that is, it + could be any command. */ + c = (struct cmd_list_element *) -1; + result_list = 0; + } + else + { + c = lookup_cmd_1 (&p, cmdlist, &result_list, 1); + } + + /* Move p up to the next interesting thing. */ + while (*p == ' ' || *p == '\t') + { + p++; + } + + if (!c) + { + /* It is an unrecognized command. So there are no + possible completions. */ + list = NULL; + } + else if (c == (struct cmd_list_element *) -1) + { + char *q; + + /* lookup_cmd_1 advances p up to the first ambiguous thing, but + doesn't advance over that thing itself. Do so now. */ + q = p; + while (*q && (isalnum (*q) || *q == '-' || *q == '_')) + ++q; + if (q != tmp_command + point) + { + /* There is something beyond the ambiguous + command, so there are no possible completions. For + example, "info t " or "info t foo" does not complete + to anything, because "info t" can be "info target" or + "info terminal". */ + list = NULL; + } + else + { + /* We're trying to complete on the command which was ambiguous. + This we can deal with. */ + if (result_list) + { + list = complete_on_cmdlist (*result_list->prefixlist, p, + word); + } + else + { + list = complete_on_cmdlist (cmdlist, p, word); + } + /* Insure that readline does the right thing with respect to + inserting quotes. */ + rl_completer_word_break_characters = + gdb_completer_command_word_break_characters; + } + } + else + { + /* We've recognized a full command. */ + + if (p == tmp_command + point) + { + /* There is no non-whitespace in the line beyond the command. */ + + if (p[-1] == ' ' || p[-1] == '\t') + { + /* The command is followed by whitespace; we need to complete + on whatever comes after command. */ + if (c->prefixlist) + { + /* It is a prefix command; what comes after it is + a subcommand (e.g. "info "). */ + list = complete_on_cmdlist (*c->prefixlist, p, word); + + /* Insure that readline does the right thing + with respect to inserting quotes. */ + rl_completer_word_break_characters = + gdb_completer_command_word_break_characters; + } + else if (c->enums) + { + list = complete_on_enum (c->enums, p, word); + rl_completer_word_break_characters = + gdb_completer_command_word_break_characters; + } + else + { + /* It is a normal command; what comes after it is + completed by the command's completer function. */ + list = (*c->completer) (p, word); + } + } + else + { + /* The command is not followed by whitespace; we need to + complete on the command itself. e.g. "p" which is a + command itself but also can complete to "print", "ptype" + etc. */ + char *q; + + /* Find the command we are completing on. */ + q = p; + while (q > tmp_command) + { + if (isalnum (q[-1]) || q[-1] == '-' || q[-1] == '_') + --q; + else + break; + } + + list = complete_on_cmdlist (result_list, q, word); + + /* Insure that readline does the right thing + with respect to inserting quotes. */ + rl_completer_word_break_characters = + gdb_completer_command_word_break_characters; + } + } + else + { + /* There is non-whitespace beyond the command. */ + + if (c->prefixlist && !c->allow_unknown) + { + /* It is an unrecognized subcommand of a prefix command, + e.g. "info adsfkdj". */ + list = NULL; + } + else if (c->enums) + { + list = complete_on_enum (c->enums, p, word); + } + else + { + /* It is a normal command. */ + list = (*c->completer) (p, word); + } + } + } + } + + /* If we found a list of potential completions during initialization then + dole them out one at a time. The vector of completions is NULL + terminated, so after returning the last one, return NULL (and continue + to do so) each time we are called after that, until a new list is + available. */ + + if (list) + { + output = list[index]; + if (output) + { + index++; + } + } + +#if 0 + /* Can't do this because readline hasn't yet checked the word breaks + for figuring out whether to insert a quote. */ + if (output == NULL) + /* Make sure the word break characters are set back to normal for the + next time that readline tries to complete something. */ + rl_completer_word_break_characters = + gdb_completer_word_break_characters; +#endif + + return (output); +} + +/* Line completion interface function for readline. */ + +static char * +readline_line_completion_function (text, matches) + char *text; + int matches; +{ + return line_completion_function (text, matches, rl_line_buffer, rl_point); +} + +/* Skip over a possibly quoted word (as defined by the quote characters + and word break characters the completer uses). Returns pointer to the + location after the "word". */ + +char * +skip_quoted (str) + char *str; +{ + char quote_char = '\0'; + char *scan; + + for (scan = str; *scan != '\0'; scan++) + { + if (quote_char != '\0') + { + /* Ignore everything until the matching close quote char */ + if (*scan == quote_char) + { + /* Found matching close quote. */ + scan++; + break; + } + } + else if (strchr (gdb_completer_quote_characters, *scan)) + { + /* Found start of a quoted string. */ + quote_char = *scan; + } + else if (strchr (gdb_completer_word_break_characters, *scan)) + { + break; + } + } + return (scan); +} + + +#ifdef STOP_SIGNAL +static void +stop_sig (signo) +int signo; +{ +#if STOP_SIGNAL == SIGTSTP + signal (SIGTSTP, SIG_DFL); + sigsetmask (0); + kill (getpid (), SIGTSTP); + signal (SIGTSTP, stop_sig); +#else + signal (STOP_SIGNAL, stop_sig); +#endif + printf_unfiltered ("%s", prompt); + gdb_flush (gdb_stdout); + + /* Forget about any previous command -- null line now will do nothing. */ + dont_repeat (); +} +#endif /* STOP_SIGNAL */ + +/* Initialize signal handlers. */ +static void +do_nothing (signo) +int signo; +{ + /* Under System V the default disposition of a signal is reinstated after + the signal is caught and delivered to an application process. On such + systems one must restore the replacement signal handler if one wishes + to continue handling the signal in one's program. On BSD systems this + is not needed but it is harmless, and it simplifies the code to just do + it unconditionally. */ + signal (signo, do_nothing); +} + +static void +init_signals () +{ + signal (SIGINT, request_quit); + + /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed + to the inferior and breakpoints will be ignored. */ +#ifdef SIGTRAP + signal (SIGTRAP, SIG_DFL); +#endif + + /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get + passed to the inferior, which we don't want. It would be + possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but + on BSD4.3 systems using vfork, that can affect the + GDB process as well as the inferior (the signal handling tables + might be in memory, shared between the two). Since we establish + a handler for SIGQUIT, when we call exec it will set the signal + to SIG_DFL for us. */ + signal (SIGQUIT, do_nothing); +#ifdef SIGHUP + if (signal (SIGHUP, do_nothing) != SIG_IGN) + signal (SIGHUP, disconnect); +#endif + signal (SIGFPE, float_handler); + +#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) + signal (SIGWINCH, SIGWINCH_HANDLER); +#endif +} + +/* Read one line from the command input stream `instream' + into the local static buffer `linebuffer' (whose current length + is `linelength'). + The buffer is made bigger as necessary. + Returns the address of the start of the line. + + NULL is returned for end of file. + + *If* the instream == stdin & stdin is a terminal, the line read + is copied into the file line saver (global var char *line, + length linesize) so that it can be duplicated. + + This routine either uses fancy command line editing or + simple input as the user has requested. */ + +char * +command_line_input (prrompt, repeat, annotation_suffix) + char *prrompt; + int repeat; + char *annotation_suffix; +{ + static char *linebuffer = 0; + static unsigned linelength = 0; + register char *p; + char *p1; + char *rl; + char *local_prompt = prrompt; + char *nline; + char got_eof = 0; + + /* The annotation suffix must be non-NULL. */ + if (annotation_suffix == NULL) + annotation_suffix = ""; + + if (annotation_level > 1 && instream == stdin) + { + local_prompt = alloca ((prrompt == NULL ? 0 : strlen (prrompt)) + + strlen (annotation_suffix) + 40); + if (prrompt == NULL) + local_prompt[0] = '\0'; + else + strcpy (local_prompt, prrompt); + strcat (local_prompt, "\n\032\032"); + strcat (local_prompt, annotation_suffix); + strcat (local_prompt, "\n"); + } + + if (linebuffer == 0) + { + linelength = 80; + linebuffer = (char *) xmalloc (linelength); + } + + p = linebuffer; + + /* Control-C quits instantly if typed while in this loop + since it should not wait until the user types a newline. */ + immediate_quit++; +#ifdef STOP_SIGNAL + if (job_control) + signal (STOP_SIGNAL, stop_sig); +#endif + + while (1) + { + /* Make sure that all output has been output. Some machines may let + you get away with leaving out some of the gdb_flush, but not all. */ + wrap_here (""); + gdb_flush (gdb_stdout); + gdb_flush (gdb_stderr); + + if (source_file_name != NULL) + { + ++source_line_number; + sprintf (source_error, + "%s%s:%d: Error in sourced command file:\n", + source_pre_error, + source_file_name, + source_line_number); + error_pre_print = source_error; + } + + if (annotation_level > 1 && instream == stdin) + { + printf_unfiltered ("\n\032\032pre-"); + printf_unfiltered (annotation_suffix); + printf_unfiltered ("\n"); + } + + /* Don't use fancy stuff if not talking to stdin. */ + if (readline_hook && instream == NULL) + { + rl = (*readline_hook) (local_prompt); + } + else if (command_editing_p && instream == stdin && ISATTY (instream)) + { + rl = readline (local_prompt); + } + else + { + rl = gdb_readline (local_prompt); + } + + if (annotation_level > 1 && instream == stdin) + { + printf_unfiltered ("\n\032\032post-"); + printf_unfiltered (annotation_suffix); + printf_unfiltered ("\n"); + } + + if (!rl || rl == (char *) EOF) + { + got_eof = 1; + break; + } + if (strlen(rl) + 1 + (p - linebuffer) > linelength) + { + linelength = strlen(rl) + 1 + (p - linebuffer); + nline = (char *) xrealloc (linebuffer, linelength); + p += nline - linebuffer; + linebuffer = nline; + } + p1 = rl; + /* Copy line. Don't copy null at end. (Leaves line alone + if this was just a newline) */ + while (*p1) + *p++ = *p1++; + + free (rl); /* Allocated in readline. */ + + if (p == linebuffer || *(p - 1) != '\\') + break; + + p--; /* Put on top of '\'. */ + local_prompt = (char *) 0; + } + +#ifdef STOP_SIGNAL + if (job_control) + signal (STOP_SIGNAL, SIG_DFL); +#endif + immediate_quit--; + + if (got_eof) + return NULL; + +#define SERVER_COMMAND_LENGTH 7 + server_command = + (p - linebuffer > SERVER_COMMAND_LENGTH) + && STREQN (linebuffer, "server ", SERVER_COMMAND_LENGTH); + if (server_command) + { + /* Note that we don't set `line'. Between this and the check in + dont_repeat, this insures that repeating will still do the + right thing. */ + *p = '\0'; + return linebuffer + SERVER_COMMAND_LENGTH; + } + + /* Do history expansion if that is wished. */ + if (history_expansion_p && instream == stdin + && ISATTY (instream)) + { + char *history_value; + int expanded; + + *p = '\0'; /* Insert null now. */ + expanded = history_expand (linebuffer, &history_value); + if (expanded) + { + /* Print the changes. */ + printf_unfiltered ("%s\n", history_value); + + /* If there was an error, call this function again. */ + if (expanded < 0) + { + free (history_value); + return command_line_input (prrompt, repeat, annotation_suffix); + } + if (strlen (history_value) > linelength) + { + linelength = strlen (history_value) + 1; + linebuffer = (char *) xrealloc (linebuffer, linelength); + } + strcpy (linebuffer, history_value); + p = linebuffer + strlen(linebuffer); + free (history_value); + } + } + + /* If we just got an empty line, and that is supposed + to repeat the previous command, return the value in the + global buffer. */ + if (repeat && p == linebuffer) + return line; + for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++) ; + if (repeat && !*p1) + return line; + + *p = 0; + + /* Add line to history if appropriate. */ + if (instream == stdin + && ISATTY (stdin) && *linebuffer) + add_history (linebuffer); + + /* Note: lines consisting solely of comments are added to the command + history. This is useful when you type a command, and then + realize you don't want to execute it quite yet. You can comment + out the command and then later fetch it from the value history + and remove the '#'. The kill ring is probably better, but some + people are in the habit of commenting things out. */ + if (*p1 == '#') + *p1 = '\0'; /* Found a comment. */ + + /* Save into global buffer if appropriate. */ + if (repeat) + { + if (linelength > linesize) + { + line = xrealloc (line, linelength); + linesize = linelength; + } + strcpy (line, linebuffer); + return line; + } + + return linebuffer; +} + + +/* Expand the body_list of COMMAND so that it can hold NEW_LENGTH + code bodies. This is typically used when we encounter an "else" + clause for an "if" command. */ + +static void +realloc_body_list (command, new_length) + struct command_line *command; + int new_length; +{ + int n; + struct command_line **body_list; + + n = command->body_count; + + /* Nothing to do? */ + if (new_length <= n) + return; + + body_list = (struct command_line **) + xmalloc (sizeof (struct command_line *) * new_length); + + memcpy (body_list, command->body_list, sizeof (struct command_line *) * n); + + free (command->body_list); + command->body_list = body_list; + command->body_count = new_length; +} + +/* Read one line from the input stream. If the command is an "else" or + "end", return such an indication to the caller. */ + +static enum misc_command_type +read_next_line (command) + struct command_line **command; +{ + char *p, *p1, *prompt_ptr, control_prompt[256]; + int i = 0; + + if (control_level >= 254) + error ("Control nesting too deep!\n"); + + /* Set a prompt based on the nesting of the control commands. */ + if (instream == stdin || (instream == 0 && readline_hook != NULL)) + { + for (i = 0; i < control_level; i++) + control_prompt[i] = ' '; + control_prompt[i] = '>'; + control_prompt[i+1] = '\0'; + prompt_ptr = (char *)&control_prompt[0]; + } + else + prompt_ptr = NULL; + + p = command_line_input (prompt_ptr, instream == stdin, "commands"); + + /* Not sure what to do here. */ + if (p == NULL) + return end_command; + + /* Strip leading and trailing whitespace. */ + while (*p == ' ' || *p == '\t') + p++; + + p1 = p + strlen (p); + while (p1 != p && (p1[-1] == ' ' || p1[-1] == '\t')) + p1--; + + /* Blanks and comments don't really do anything, but we need to + distinguish them from else, end and other commands which can be + executed. */ + if (p1 == p || p[0] == '#') + return nop_command; + + /* Is this the end of a simple, while, or if control structure? */ + if (p1 - p == 3 && !strncmp (p, "end", 3)) + return end_command; + + /* Is the else clause of an if control structure? */ + if (p1 - p == 4 && !strncmp (p, "else", 4)) + return else_command; + + /* Check for while, if, break, continue, etc and build a new command + line structure for them. */ + if (p1 - p > 5 && !strncmp (p, "while", 5)) + *command = build_command_line (while_control, p + 6); + else if (p1 - p > 2 && !strncmp (p, "if", 2)) + *command = build_command_line (if_control, p + 3); + else if (p1 - p == 10 && !strncmp (p, "loop_break", 10)) + { + *command = (struct command_line *) + xmalloc (sizeof (struct command_line)); + (*command)->next = NULL; + (*command)->line = NULL; + (*command)->control_type = break_control; + (*command)->body_count = 0; + (*command)->body_list = NULL; + } + else if (p1 - p == 13 && !strncmp (p, "loop_continue", 13)) + { + *command = (struct command_line *) + xmalloc (sizeof (struct command_line)); + (*command)->next = NULL; + (*command)->line = NULL; + (*command)->control_type = continue_control; + (*command)->body_count = 0; + (*command)->body_list = NULL; + } + else + { + /* A normal command. */ + *command = (struct command_line *) + xmalloc (sizeof (struct command_line)); + (*command)->next = NULL; + (*command)->line = savestring (p, p1 - p); + (*command)->control_type = simple_control; + (*command)->body_count = 0; + (*command)->body_list = NULL; + } + + /* Nothing special. */ + return ok_command; +} + +/* Recursively read in the control structures and create a command_line + structure from them. + + The parent_control parameter is the control structure in which the + following commands are nested. */ + +static enum command_control_type +recurse_read_control_structure (current_cmd) + struct command_line *current_cmd; +{ + int current_body, i; + enum misc_command_type val; + enum command_control_type ret; + struct command_line **body_ptr, *child_tail, *next; + + child_tail = NULL; + current_body = 1; + + /* Sanity checks. */ + if (current_cmd->control_type == simple_control) + { + error ("Recursed on a simple control type\n"); + return invalid_control; + } + + if (current_body > current_cmd->body_count) + { + error ("Allocated body is smaller than this command type needs\n"); + return invalid_control; + } + + /* Read lines from the input stream and build control structures. */ + while (1) + { + dont_repeat (); + + next = NULL; + val = read_next_line (&next); + + /* Just skip blanks and comments. */ + if (val == nop_command) + continue; + + if (val == end_command) + { + if (current_cmd->control_type == while_control + || current_cmd->control_type == if_control) + { + /* Success reading an entire control structure. */ + ret = simple_control; + break; + } + else + { + ret = invalid_control; + break; + } + } + + /* Not the end of a control structure. */ + if (val == else_command) + { + if (current_cmd->control_type == if_control + && current_body == 1) + { + realloc_body_list (current_cmd, 2); + current_body = 2; + child_tail = NULL; + continue; + } + else + { + ret = invalid_control; + break; + } + } + + if (child_tail) + { + child_tail->next = next; + } + else + { + body_ptr = current_cmd->body_list; + for (i = 1; i < current_body; i++) + body_ptr++; + + *body_ptr = next; + + } + + child_tail = next; + + /* If the latest line is another control structure, then recurse + on it. */ + if (next->control_type == while_control + || next->control_type == if_control) + { + control_level++; + ret = recurse_read_control_structure (next); + control_level--; + + if (ret != simple_control) + break; + } + } + + dont_repeat (); + + return ret; +} + +/* Read lines from the input stream and accumulate them in a chain of + struct command_line's, which is then returned. For input from a + terminal, the special command "end" is used to mark the end of the + input, and is not included in the returned chain of commands. */ + +#define END_MESSAGE "End with a line saying just \"end\"." + +struct command_line * +read_command_lines (prompt, from_tty) +char *prompt; +int from_tty; +{ + struct command_line *head, *tail, *next; + struct cleanup *old_chain; + enum command_control_type ret; + enum misc_command_type val; + + if (readline_begin_hook) + { + /* Note - intentional to merge messages with no newline */ + (*readline_begin_hook) ("%s %s\n", prompt, END_MESSAGE); + } + else if (from_tty && input_from_terminal_p ()) + { + printf_unfiltered ("%s\n%s\n", prompt, END_MESSAGE); + gdb_flush (gdb_stdout); + } + + head = tail = NULL; + old_chain = NULL; + + while (1) + { + val = read_next_line (&next); + + /* Ignore blank lines or comments. */ + if (val == nop_command) + continue; + + if (val == end_command) + { + ret = simple_control; + break; + } + + if (val != ok_command) + { + ret = invalid_control; + break; + } + + if (next->control_type == while_control + || next->control_type == if_control) + { + control_level++; + ret = recurse_read_control_structure (next); + control_level--; + + if (ret == invalid_control) + break; + } + + if (tail) + { + tail->next = next; + } + else + { + head = next; + old_chain = make_cleanup ((make_cleanup_func) free_command_lines, + &head); + } + tail = next; + } + + dont_repeat (); + + if (head) + { + if (ret != invalid_control) + { + discard_cleanups (old_chain); + } + else + do_cleanups (old_chain); + } + + if (readline_end_hook) + { + (*readline_end_hook) (); + } + return (head); +} + +/* Free a chain of struct command_line's. */ + +void +free_command_lines (lptr) + struct command_line **lptr; +{ + register struct command_line *l = *lptr; + register struct command_line *next; + struct command_line **blist; + int i; + + while (l) + { + if (l->body_count > 0) + { + blist = l->body_list; + for (i = 0; i < l->body_count; i++, blist++) + free_command_lines (blist); + } + next = l->next; + free (l->line); + free ((PTR)l); + l = next; + } +} + +/* Add an element to the list of info subcommands. */ + +void +add_info (name, fun, doc) + char *name; + void (*fun) PARAMS ((char *, int)); + char *doc; +{ + add_cmd (name, no_class, fun, doc, &infolist); +} + +/* Add an alias to the list of info subcommands. */ + +void +add_info_alias (name, oldname, abbrev_flag) + char *name; + char *oldname; + int abbrev_flag; +{ + add_alias_cmd (name, oldname, 0, abbrev_flag, &infolist); +} + +/* The "info" command is defined as a prefix, with allow_unknown = 0. + Therefore, its own definition is called only for "info" with no args. */ + +/* ARGSUSED */ +static void +info_command (arg, from_tty) + char *arg; + int from_tty; +{ + printf_unfiltered ("\"info\" must be followed by the name of an info command.\n"); + help_list (infolist, "info ", -1, gdb_stdout); +} + +/* The "complete" command is used by Emacs to implement completion. */ + +/* ARGSUSED */ +static void +complete_command (arg, from_tty) + char *arg; + int from_tty; +{ + int i; + int argpoint; + char *completion; + + dont_repeat (); + + if (arg == NULL) + arg = ""; + argpoint = strlen (arg); + + for (completion = line_completion_function (arg, i = 0, arg, argpoint); + completion; + completion = line_completion_function (arg, ++i, arg, argpoint)) + { + printf_unfiltered ("%s\n", completion); + free (completion); + } +} + +/* The "show" command with no arguments shows all the settings. */ + +/* ARGSUSED */ +static void +show_command (arg, from_tty) + char *arg; + int from_tty; +{ + cmd_show_list (showlist, from_tty, ""); +} + +/* Add an element to the list of commands. */ + +void +add_com (name, class, fun, doc) + char *name; + enum command_class class; + void (*fun) PARAMS ((char *, int)); + char *doc; +{ + add_cmd (name, class, fun, doc, &cmdlist); +} + +/* Add an alias or abbreviation command to the list of commands. */ + +void +add_com_alias (name, oldname, class, abbrev_flag) + char *name; + char *oldname; + enum command_class class; + int abbrev_flag; +{ + add_alias_cmd (name, oldname, class, abbrev_flag, &cmdlist); +} + +void +error_no_arg (why) + char *why; +{ + error ("Argument required (%s).", why); +} + +/* ARGSUSED */ +static void +help_command (command, from_tty) + char *command; + int from_tty; /* Ignored */ +{ + help_cmd (command, gdb_stdout); +} + +static void +validate_comname (comname) + char *comname; +{ + register char *p; + + if (comname == 0) + error_no_arg ("name of command to define"); + + p = comname; + while (*p) + { + if (!isalnum(*p) && *p != '-' && *p != '_') + error ("Junk in argument list: \"%s\"", p); + p++; + } +} + +/* This is just a placeholder in the command data structures. */ +static void +user_defined_command (ignore, from_tty) + char *ignore; + int from_tty; +{ +} + +static void +define_command (comname, from_tty) + char *comname; + int from_tty; +{ + register struct command_line *cmds; + register struct cmd_list_element *c, *newc, *hookc = 0; + char *tem = comname; + char tmpbuf[128]; +#define HOOK_STRING "hook-" +#define HOOK_LEN 5 + + validate_comname (comname); + + /* Look it up, and verify that we got an exact match. */ + c = lookup_cmd (&tem, cmdlist, "", -1, 1); + if (c && !STREQ (comname, c->name)) + c = 0; + + if (c) + { + if (c->class == class_user || c->class == class_alias) + tem = "Redefine command \"%s\"? "; + else + tem = "Really redefine built-in command \"%s\"? "; + if (!query (tem, c->name)) + error ("Command \"%s\" not redefined.", c->name); + } + + /* If this new command is a hook, then mark the command which it + is hooking. Note that we allow hooking `help' commands, so that + we can hook the `stop' pseudo-command. */ + + if (!strncmp (comname, HOOK_STRING, HOOK_LEN)) + { + /* Look up cmd it hooks, and verify that we got an exact match. */ + tem = comname+HOOK_LEN; + hookc = lookup_cmd (&tem, cmdlist, "", -1, 0); + if (hookc && !STREQ (comname+HOOK_LEN, hookc->name)) + hookc = 0; + if (!hookc) + { + warning ("Your new `%s' command does not hook any existing command.", + comname); + if (!query ("Proceed? ")) + error ("Not confirmed."); + } + } + + comname = savestring (comname, strlen (comname)); + + /* If the rest of the commands will be case insensitive, this one + should behave in the same manner. */ + for (tem = comname; *tem; tem++) + if (isupper(*tem)) *tem = tolower(*tem); + + control_level = 0; + sprintf (tmpbuf, "Type commands for definition of \"%s\".", comname); + cmds = read_command_lines (tmpbuf, from_tty); + + if (c && c->class == class_user) + free_command_lines (&c->user_commands); + + newc = add_cmd (comname, class_user, user_defined_command, + (c && c->class == class_user) + ? c->doc : savestring ("User-defined.", 13), &cmdlist); + newc->user_commands = cmds; + + /* If this new command is a hook, then mark both commands as being + tied. */ + if (hookc) + { + hookc->hook = newc; /* Target gets hooked. */ + newc->hookee = hookc; /* We are marked as hooking target cmd. */ + } +} + +static void +document_command (comname, from_tty) + char *comname; + int from_tty; +{ + struct command_line *doclines; + register struct cmd_list_element *c; + char *tem = comname; + char tmpbuf[128]; + + validate_comname (comname); + + c = lookup_cmd (&tem, cmdlist, "", 0, 1); + + if (c->class != class_user) + error ("Command \"%s\" is built-in.", comname); + + sprintf (tmpbuf, "Type documentation for \"%s\".", comname); + doclines = read_command_lines (tmpbuf, from_tty); + + if (c->doc) free (c->doc); + + { + register struct command_line *cl1; + register int len = 0; + + for (cl1 = doclines; cl1; cl1 = cl1->next) + len += strlen (cl1->line) + 1; + + c->doc = (char *) xmalloc (len + 1); + *c->doc = 0; + + for (cl1 = doclines; cl1; cl1 = cl1->next) + { + strcat (c->doc, cl1->line); + if (cl1->next) + strcat (c->doc, "\n"); + } + } + + free_command_lines (&doclines); +} + +/* Print the GDB banner. */ +void +print_gdb_version (stream) + GDB_FILE *stream; +{ + /* From GNU coding standards, first line is meant to be easy for a + program to parse, and is just canonical program name and version + number, which starts after last space. */ + + fprintf_filtered (stream, "GNU gdb %s\n", version); + + /* Second line is a copyright notice. */ + + fprintf_filtered (stream, "Copyright 1998 Free Software Foundation, Inc.\n"); + + /* Following the copyright is a brief statement that the program is + free software, that users are free to copy and change it on + certain conditions, that it is covered by the GNU GPL, and that + there is no warranty. */ + + fprintf_filtered (stream, "\ +GDB is free software, covered by the GNU General Public License, and you are\n\ +welcome to change it and/or distribute copies of it under certain conditions.\n\ +Type \"show copying\" to see the conditions.\n\ +There is absolutely no warranty for GDB. Type \"show warranty\" for details.\n"); + + /* After the required info we print the configuration information. */ + + fprintf_filtered (stream, "This GDB was configured as \""); + if (!STREQ (host_name, target_name)) + { + fprintf_filtered (stream, "--host=%s --target=%s", host_name, target_name); + } + else + { + fprintf_filtered (stream, "%s", host_name); + } + fprintf_filtered (stream, "\"."); +} + +/* ARGSUSED */ +static void +show_version (args, from_tty) + char *args; + int from_tty; +{ + immediate_quit++; + print_gdb_version (gdb_stdout); + printf_filtered ("\n"); + immediate_quit--; +} + +/* xgdb calls this to reprint the usual GDB prompt. Obsolete now that xgdb + is obsolete. */ + +void +print_prompt () +{ + printf_unfiltered ("%s", prompt); + gdb_flush (gdb_stdout); +} + +/* This replaces the above for the frontends: it returns a pointer + to the prompt. */ +char * +get_prompt () +{ + return prompt; +} + +void +set_prompt (s) + char *s; +{ +/* ??rehrauer: I don't know why this fails, since it looks as though + assignments to prompt are wrapped in calls to savestring... + if (prompt != NULL) + free (prompt); +*/ + prompt = savestring (s, strlen (s)); +} + + +/* If necessary, make the user confirm that we should quit. Return + non-zero if we should quit, zero if we shouldn't. */ + +int +quit_confirm () +{ + if (inferior_pid != 0 && target_has_execution) + { + char *s; + + /* This is something of a hack. But there's no reliable way to + see if a GUI is running. The `use_windows' variable doesn't + cut it. */ + if (init_ui_hook) + s = "A debugging session is active.\nDo you still want to close the debugger?"; + else if (attach_flag) + s = "The program is running. Quit anyway (and detach it)? "; + else + s = "The program is running. Exit anyway? "; + + if (! query (s)) + return 0; + } + + return 1; +} + +/* Quit without asking for confirmation. */ + +void +quit_force (args, from_tty) + char *args; + int from_tty; +{ + int exit_code = 0; + + /* An optional expression may be used to cause gdb to terminate with the + value of that expression. */ + if (args) + { + value_ptr val = parse_and_eval (args); + + exit_code = (int) value_as_long (val); + } + + if (inferior_pid != 0 && target_has_execution) + { + if (attach_flag) + target_detach (args, from_tty); + else + target_kill (); + } + + /* UDI wants this, to kill the TIP. */ + target_close (1); + + /* Save the history information if it is appropriate to do so. */ + if (write_history_p && history_filename) + write_history (history_filename); + + do_final_cleanups(ALL_CLEANUPS); /* Do any final cleanups before exiting */ + +#if defined(TUI) + /* tuiDo((TuiOpaqueFuncPtr)tuiCleanUp); */ + /* The above does not need to be inside a tuiDo(), since + * it is not manipulating the curses screen, but rather, + * it is tearing it down. + */ + if (tui_version) + tuiCleanUp(); +#endif + + exit (exit_code); +} + +/* Handle the quit command. */ + +void +quit_command (args, from_tty) + char *args; + int from_tty; +{ + if (! quit_confirm ()) + error ("Not confirmed."); + quit_force (args, from_tty); +} + +/* Returns whether GDB is running on a terminal and whether the user + desires that questions be asked of them on that terminal. */ + +int +input_from_terminal_p () +{ + return gdb_has_a_terminal () && (instream == stdin) & caution; +} + +/* ARGSUSED */ +static void +pwd_command (args, from_tty) + char *args; + int from_tty; +{ + if (args) error ("The \"pwd\" command does not take an argument: %s", args); + getcwd (gdb_dirbuf, sizeof (gdb_dirbuf)); + + if (!STREQ (gdb_dirbuf, current_directory)) + printf_unfiltered ("Working directory %s\n (canonically %s).\n", + current_directory, gdb_dirbuf); + else + printf_unfiltered ("Working directory %s.\n", current_directory); +} + +void +cd_command (dir, from_tty) + char *dir; + int from_tty; +{ + int len; + /* Found something other than leading repetitions of "/..". */ + int found_real_path; + char *p; + + /* If the new directory is absolute, repeat is a no-op; if relative, + repeat might be useful but is more likely to be a mistake. */ + dont_repeat (); + + if (dir == 0) + error_no_arg ("new working directory"); + + dir = tilde_expand (dir); + make_cleanup (free, dir); + + if (chdir (dir) < 0) + perror_with_name (dir); + + len = strlen (dir); + dir = savestring (dir, len - (len > 1 && SLASH_P(dir[len-1]))); + if (ROOTED_P(dir)) + current_directory = dir; + else + { + if (SLASH_P (current_directory[0]) && current_directory[1] == '\0') + current_directory = concat (current_directory, dir, NULL); + else + current_directory = concat (current_directory, SLASH_STRING, dir, NULL); + free (dir); + } + + /* Now simplify any occurrences of `.' and `..' in the pathname. */ + + found_real_path = 0; + for (p = current_directory; *p;) + { + if (SLASH_P (p[0]) && p[1] == '.' && (p[2] == 0 || SLASH_P (p[2]))) + strcpy (p, p + 2); + else if (SLASH_P (p[0]) && p[1] == '.' && p[2] == '.' + && (p[3] == 0 || SLASH_P (p[3]))) + { + if (found_real_path) + { + /* Search backwards for the directory just before the "/.." + and obliterate it and the "/..". */ + char *q = p; + while (q != current_directory && ! SLASH_P (q[-1])) + --q; + + if (q == current_directory) + /* current_directory is + a relative pathname ("can't happen"--leave it alone). */ + ++p; + else + { + strcpy (q - 1, p + 3); + p = q - 1; + } + } + else + /* We are dealing with leading repetitions of "/..", for example + "/../..", which is the Mach super-root. */ + p += 3; + } + else + { + found_real_path = 1; + ++p; + } + } + + forget_cached_source_info (); + + if (from_tty) + pwd_command ((char *) 0, 1); +} + +struct source_cleanup_lines_args { + int old_line; + char *old_file; + char *old_pre_error; + char *old_error_pre_print; +}; + +static void +source_cleanup_lines (args) + PTR args; +{ + struct source_cleanup_lines_args *p = + (struct source_cleanup_lines_args *)args; + source_line_number = p->old_line; + source_file_name = p->old_file; + source_pre_error = p->old_pre_error; + error_pre_print = p->old_error_pre_print; +} + +/* ARGSUSED */ +void +source_command (args, from_tty) + char *args; + int from_tty; +{ + FILE *stream; + struct cleanup *old_cleanups; + char *file = args; + struct source_cleanup_lines_args old_lines; + int needed_length; + + if (file == NULL) + { + error ("source command requires pathname of file to source."); + } + + file = tilde_expand (file); + old_cleanups = make_cleanup (free, file); + + stream = fopen (file, FOPEN_RT); + if (!stream) + if (from_tty) + perror_with_name (file); + else + return; + + make_cleanup ((make_cleanup_func) fclose, stream); + + old_lines.old_line = source_line_number; + old_lines.old_file = source_file_name; + old_lines.old_pre_error = source_pre_error; + old_lines.old_error_pre_print = error_pre_print; + make_cleanup (source_cleanup_lines, &old_lines); + source_line_number = 0; + source_file_name = file; + source_pre_error = error_pre_print == NULL ? "" : error_pre_print; + source_pre_error = savestring (source_pre_error, strlen (source_pre_error)); + make_cleanup (free, source_pre_error); + /* This will get set every time we read a line. So it won't stay "" for + long. */ + error_pre_print = ""; + + needed_length = strlen (source_file_name) + strlen (source_pre_error) + 80; + if (source_error_allocated < needed_length) + { + source_error_allocated *= 2; + if (source_error_allocated < needed_length) + source_error_allocated = needed_length; + if (source_error == NULL) + source_error = xmalloc (source_error_allocated); + else + source_error = xrealloc (source_error, source_error_allocated); + } + + read_command_file (stream); + + do_cleanups (old_cleanups); +} + +/* ARGSUSED */ +static void +echo_command (text, from_tty) + char *text; + int from_tty; +{ + char *p = text; + register int c; + + if (text) + while ((c = *p++) != '\0') + { + if (c == '\\') + { + /* \ at end of argument is used after spaces + so they won't be lost. */ + if (*p == 0) + return; + + c = parse_escape (&p); + if (c >= 0) + printf_filtered ("%c", c); + } + else + printf_filtered ("%c", c); + } + + /* Force this output to appear now. */ + wrap_here (""); + gdb_flush (gdb_stdout); +} + +/* ARGSUSED */ +static void +dont_repeat_command (ignored, from_tty) + char *ignored; + int from_tty; +{ + *line = 0; /* Can't call dont_repeat here because we're not + necessarily reading from stdin. */ +} + +/* Functions to manipulate command line editing control variables. */ + +/* Number of commands to print in each call to show_commands. */ +#define Hist_print 10 +static void +show_commands (args, from_tty) + char *args; + int from_tty; +{ + /* Index for history commands. Relative to history_base. */ + int offset; + + /* Number of the history entry which we are planning to display next. + Relative to history_base. */ + static int num = 0; + + /* The first command in the history which doesn't exist (i.e. one more + than the number of the last command). Relative to history_base. */ + int hist_len; + + extern HIST_ENTRY *history_get PARAMS ((int)); + + /* Print out some of the commands from the command history. */ + /* First determine the length of the history list. */ + hist_len = history_size; + for (offset = 0; offset < history_size; offset++) + { + if (!history_get (history_base + offset)) + { + hist_len = offset; + break; + } + } + + if (args) + { + if (args[0] == '+' && args[1] == '\0') + /* "info editing +" should print from the stored position. */ + ; + else + /* "info editing <exp>" should print around command number <exp>. */ + num = (parse_and_eval_address (args) - history_base) - Hist_print / 2; + } + /* "show commands" means print the last Hist_print commands. */ + else + { + num = hist_len - Hist_print; + } + + if (num < 0) + num = 0; + + /* If there are at least Hist_print commands, we want to display the last + Hist_print rather than, say, the last 6. */ + if (hist_len - num < Hist_print) + { + num = hist_len - Hist_print; + if (num < 0) + num = 0; + } + + for (offset = num; offset < num + Hist_print && offset < hist_len; offset++) + { + printf_filtered ("%5d %s\n", history_base + offset, + (history_get (history_base + offset))->line); + } + + /* The next command we want to display is the next one that we haven't + displayed yet. */ + num += Hist_print; + + /* If the user repeats this command with return, it should do what + "show commands +" does. This is unnecessary if arg is null, + because "show commands +" is not useful after "show commands". */ + if (from_tty && args) + { + args[0] = '+'; + args[1] = '\0'; + } +} + +/* Called by do_setshow_command. */ +/* ARGSUSED */ +static void +set_history_size_command (args, from_tty, c) + char *args; + int from_tty; + struct cmd_list_element *c; +{ + if (history_size == INT_MAX) + unstifle_history (); + else if (history_size >= 0) + stifle_history (history_size); + else + { + history_size = INT_MAX; + error ("History size must be non-negative"); + } +} + +/* ARGSUSED */ +static void +set_history (args, from_tty) + char *args; + int from_tty; +{ + printf_unfiltered ("\"set history\" must be followed by the name of a history subcommand.\n"); + help_list (sethistlist, "set history ", -1, gdb_stdout); +} + +/* ARGSUSED */ +static void +show_history (args, from_tty) + char *args; + int from_tty; +{ + cmd_show_list (showhistlist, from_tty, ""); +} + +int info_verbose = 0; /* Default verbose msgs off */ + +/* Called by do_setshow_command. An elaborate joke. */ +/* ARGSUSED */ +static void +set_verbose (args, from_tty, c) + char *args; + int from_tty; + struct cmd_list_element *c; +{ + char *cmdname = "verbose"; + struct cmd_list_element *showcmd; + + showcmd = lookup_cmd_1 (&cmdname, showlist, NULL, 1); + + if (info_verbose) + { + c->doc = "Set verbose printing of informational messages."; + showcmd->doc = "Show verbose printing of informational messages."; + } + else + { + c->doc = "Set verbosity."; + showcmd->doc = "Show verbosity."; + } +} + +static void +float_handler (signo) +int signo; +{ + /* This message is based on ANSI C, section 4.7. Note that integer + divide by zero causes this, so "float" is a misnomer. */ + signal (SIGFPE, float_handler); + error ("Erroneous arithmetic operation."); +} + + +static void +init_cmd_lists () +{ + cmdlist = NULL; + infolist = NULL; + enablelist = NULL; + disablelist = NULL; + togglelist = NULL; + stoplist = NULL; + deletelist = NULL; + enablebreaklist = NULL; + setlist = NULL; + unsetlist = NULL; + showlist = NULL; + sethistlist = NULL; + showhistlist = NULL; + unsethistlist = NULL; +#if MAINTENANCE_CMDS + maintenancelist = NULL; + maintenanceinfolist = NULL; + maintenanceprintlist = NULL; +#endif + setprintlist = NULL; + showprintlist = NULL; + setchecklist = NULL; + showchecklist = NULL; +} + +/* Init the history buffer. Note that we are called after the init file(s) + * have been read so that the user can change the history file via his + * .gdbinit file (for instance). The GDBHISTFILE environment variable + * overrides all of this. + */ + +void +init_history() +{ + char *tmpenv; + + tmpenv = getenv ("HISTSIZE"); + if (tmpenv) + history_size = atoi (tmpenv); + else if (!history_size) + history_size = 256; + + stifle_history (history_size); + + tmpenv = getenv ("GDBHISTFILE"); + if (tmpenv) + history_filename = savestring (tmpenv, strlen(tmpenv)); + else if (!history_filename) { + /* We include the current directory so that if the user changes + directories the file written will be the same as the one + that was read. */ + history_filename = concat (current_directory, "/.gdb_history", NULL); + } + read_history (history_filename); +} + +static void +init_main () +{ + struct cmd_list_element *c; + +#ifdef DEFAULT_PROMPT + prompt = savestring (DEFAULT_PROMPT, strlen(DEFAULT_PROMPT)); +#else + prompt = savestring ("(gdb) ", 6); +#endif + + /* Set the important stuff up for command editing. */ + command_editing_p = 1; + history_expansion_p = 0; + write_history_p = 0; + + /* Setup important stuff for command line editing. */ + rl_completion_entry_function = (int (*)()) readline_line_completion_function; + rl_completer_word_break_characters = gdb_completer_word_break_characters; + rl_completer_quote_characters = gdb_completer_quote_characters; + rl_readline_name = "gdb"; + + /* Define the classes of commands. + They will appear in the help list in the reverse of this order. */ + + add_cmd ("internals", class_maintenance, NO_FUNCTION, + "Maintenance commands.\n\ +Some gdb commands are provided just for use by gdb maintainers.\n\ +These commands are subject to frequent change, and may not be as\n\ +well documented as user commands.", + &cmdlist); + add_cmd ("obscure", class_obscure, NO_FUNCTION, "Obscure features.", &cmdlist); + add_cmd ("aliases", class_alias, NO_FUNCTION, "Aliases of other commands.", &cmdlist); + add_cmd ("user-defined", class_user, NO_FUNCTION, "User-defined commands.\n\ +The commands in this class are those defined by the user.\n\ +Use the \"define\" command to define a command.", &cmdlist); + add_cmd ("support", class_support, NO_FUNCTION, "Support facilities.", &cmdlist); + if (!dbx_commands) + add_cmd ("status", class_info, NO_FUNCTION, "Status inquiries.", &cmdlist); + add_cmd ("files", class_files, NO_FUNCTION, "Specifying and examining files.", &cmdlist); + add_cmd ("breakpoints", class_breakpoint, NO_FUNCTION, "Making program stop at certain points.", &cmdlist); + add_cmd ("data", class_vars, NO_FUNCTION, "Examining data.", &cmdlist); + add_cmd ("stack", class_stack, NO_FUNCTION, "Examining the stack.\n\ +The stack is made up of stack frames. Gdb assigns numbers to stack frames\n\ +counting from zero for the innermost (currently executing) frame.\n\n\ +At any time gdb identifies one frame as the \"selected\" frame.\n\ +Variable lookups are done with respect to the selected frame.\n\ +When the program being debugged stops, gdb selects the innermost frame.\n\ +The commands below can be used to select other frames by number or address.", + &cmdlist); + add_cmd ("running", class_run, NO_FUNCTION, "Running the program.", &cmdlist); + + add_com ("pwd", class_files, pwd_command, + "Print working directory. This is used for your program as well."); + c = add_cmd ("cd", class_files, cd_command, + "Set working directory to DIR for debugger and program being debugged.\n\ +The change does not take effect for the program being debugged\n\ +until the next time it is started.", &cmdlist); + c->completer = filename_completer; + + add_show_from_set + (add_set_cmd ("prompt", class_support, var_string, (char *)&prompt, + "Set gdb's prompt", + &setlist), + &showlist); + + add_com ("echo", class_support, echo_command, + "Print a constant string. Give string as argument.\n\ +C escape sequences may be used in the argument.\n\ +No newline is added at the end of the argument;\n\ +use \"\\n\" if you want a newline to be printed.\n\ +Since leading and trailing whitespace are ignored in command arguments,\n\ +if you want to print some you must use \"\\\" before leading whitespace\n\ +to be printed or after trailing whitespace."); + add_com ("document", class_support, document_command, + "Document a user-defined command.\n\ +Give command name as argument. Give documentation on following lines.\n\ +End with a line of just \"end\"."); + add_com ("define", class_support, define_command, + "Define a new command name. Command name is argument.\n\ +Definition appears on following lines, one command per line.\n\ +End with a line of just \"end\".\n\ +Use the \"document\" command to give documentation for the new command.\n\ +Commands defined in this way may have up to ten arguments."); + +#ifdef __STDC__ + c = add_cmd ("source", class_support, source_command, + "Read commands from a file named FILE.\n\ +Note that the file \"" GDBINIT_FILENAME "\" is read automatically in this way\n\ +when gdb is started.", &cmdlist); +#else + /* Punt file name, we can't help it easily. */ + c = add_cmd ("source", class_support, source_command, + "Read commands from a file named FILE.\n\ +Note that the file \".gdbinit\" is read automatically in this way\n\ +when gdb is started.", &cmdlist); +#endif + c->completer = filename_completer; + + add_com ("quit", class_support, quit_command, "Exit gdb."); + add_com ("help", class_support, help_command, "Print list of commands."); + add_com_alias ("q", "quit", class_support, 1); + add_com_alias ("h", "help", class_support, 1); + + add_com ("dont-repeat", class_support, dont_repeat_command, "Don't repeat this command.\n\ +Primarily used inside of user-defined commands that should not be repeated when\n\ +hitting return."); + + c = add_set_cmd ("verbose", class_support, var_boolean, (char *)&info_verbose, + "Set ", + &setlist), + add_show_from_set (c, &showlist); + c->function.sfunc = set_verbose; + set_verbose (NULL, 0, c); + + add_show_from_set + (add_set_cmd ("editing", class_support, var_boolean, (char *)&command_editing_p, + "Set editing of command lines as they are typed.\n\ +Use \"on\" to enable the editing, and \"off\" to disable it.\n\ +Without an argument, command line editing is enabled. To edit, use\n\ +EMACS-like or VI-like commands like control-P or ESC.", &setlist), + &showlist); + + add_prefix_cmd ("history", class_support, set_history, + "Generic command for setting command history parameters.", + &sethistlist, "set history ", 0, &setlist); + add_prefix_cmd ("history", class_support, show_history, + "Generic command for showing command history parameters.", + &showhistlist, "show history ", 0, &showlist); + + add_show_from_set + (add_set_cmd ("expansion", no_class, var_boolean, (char *)&history_expansion_p, + "Set history expansion on command input.\n\ +Without an argument, history expansion is enabled.", &sethistlist), + &showhistlist); + + add_show_from_set + (add_set_cmd ("save", no_class, var_boolean, (char *)&write_history_p, + "Set saving of the history record on exit.\n\ +Use \"on\" to enable the saving, and \"off\" to disable it.\n\ +Without an argument, saving is enabled.", &sethistlist), + &showhistlist); + + c = add_set_cmd ("size", no_class, var_integer, (char *)&history_size, + "Set the size of the command history, \n\ +ie. the number of previous commands to keep a record of.", &sethistlist); + add_show_from_set (c, &showhistlist); + c->function.sfunc = set_history_size_command; + + add_show_from_set + (add_set_cmd ("filename", no_class, var_filename, (char *)&history_filename, + "Set the filename in which to record the command history\n\ + (the list of previous commands of which a record is kept).", &sethistlist), + &showhistlist); + + add_show_from_set + (add_set_cmd ("confirm", class_support, var_boolean, + (char *)&caution, + "Set whether to confirm potentially dangerous operations.", + &setlist), + &showlist); + + add_prefix_cmd ("info", class_info, info_command, + "Generic command for showing things about the program being debugged.", + &infolist, "info ", 0, &cmdlist); + add_com_alias ("i", "info", class_info, 1); + + add_com ("complete", class_obscure, complete_command, + "List the completions for the rest of the line as a command."); + + add_prefix_cmd ("show", class_info, show_command, + "Generic command for showing things about the debugger.", + &showlist, "show ", 0, &cmdlist); + /* Another way to get at the same thing. */ + add_info ("set", show_command, "Show all GDB settings."); + + add_cmd ("commands", no_class, show_commands, + "Show the history of commands you typed.\n\ +You can supply a command number to start with, or a `+' to start after\n\ +the previous command number shown.", + &showlist); + + add_cmd ("version", no_class, show_version, + "Show what version of GDB this is.", &showlist); + + add_com ("while", class_support, while_command, +"Execute nested commands WHILE the conditional expression is non zero.\n\ +The conditional expression must follow the word `while' and must in turn be\n\ +followed by a new line. The nested commands must be entered one per line,\n\ +and should be terminated by the word `end'."); + + add_com ("if", class_support, if_command, +"Execute nested commands once IF the conditional expression is non zero.\n\ +The conditional expression must follow the word `if' and must in turn be\n\ +followed by a new line. The nested commands must be entered one per line,\n\ +and should be terminated by the word 'else' or `end'. If an else clause\n\ +is used, the same rules apply to its nested commands as to the first ones."); + + /* If target is open when baud changes, it doesn't take effect until the + next open (I think, not sure). */ + add_show_from_set (add_set_cmd ("remotebaud", no_class, + var_zinteger, (char *)&baud_rate, + "Set baud rate for remote serial I/O.\n\ +This value is used to set the speed of the serial port when debugging\n\ +using remote targets.", &setlist), + &showlist); + + add_show_from_set ( + add_set_cmd ("remotedebug", no_class, var_zinteger, (char *)&remote_debug, + "Set debugging of remote protocol.\n\ +When enabled, each packet sent or received with the remote target\n\ +is displayed.", &setlist), + &showlist); + + add_show_from_set ( + add_set_cmd ("remotetimeout", no_class, var_integer, (char *)&remote_timeout, + "Set timeout limit to wait for target to respond.\n\ +This value is used to set the time limit for gdb to wait for a response\n\ +from the target.", &setlist), + &showlist); + + c = add_set_cmd ("annotate", class_obscure, var_zinteger, + (char *)&annotation_level, "Set annotation_level.\n\ +0 == normal; 1 == fullname (for use when running under emacs)\n\ +2 == output annotated suitably for use by programs that control GDB.", + &setlist); + c = add_show_from_set (c, &showlist); +} |