/* Variables that describe the inferior process running under GDB:
Where it is, why it stopped, and how to step it.
- Copyright (C) 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
- 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007
- Free Software Foundation, Inc.
+ Copyright (C) 1986-2018 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
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
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., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#if !defined (INFERIOR_H)
#define INFERIOR_H 1
struct type;
struct gdbarch;
struct regcache;
+struct ui_out;
+struct terminal_info;
+struct target_desc_info;
+struct continuation;
+struct inferior;
+struct thread_info;
/* For bpstat. */
#include "breakpoint.h"
-/* For enum target_signal. */
+/* For enum gdb_signal. */
#include "target.h"
/* For struct frame_id. */
#include "frame.h"
-/* Structure in which to save the status of the inferior. Create/Save
- through "save_inferior_status", restore through
- "restore_inferior_status".
+/* For gdb_environ. */
+#include "environ.h"
- This pair of routines should be called around any transfer of
- control to the inferior which you don't want showing up in your
- control variables. */
+#include "progspace.h"
+#include "registry.h"
-struct inferior_status;
+#include "symfile-add-flags.h"
+#include "common/refcounted-object.h"
-extern struct inferior_status *save_inferior_status (int);
+#include "common-inferior.h"
-extern void restore_inferior_status (struct inferior_status *);
+struct infcall_suspend_state;
+struct infcall_control_state;
-extern struct cleanup *make_cleanup_restore_inferior_status (struct inferior_status *);
+extern void restore_infcall_suspend_state (struct infcall_suspend_state *);
+extern void restore_infcall_control_state (struct infcall_control_state *);
-extern void discard_inferior_status (struct inferior_status *);
-
-extern void write_inferior_status_register (struct inferior_status
- *inf_status, int regno,
- LONGEST val);
-
-/* The -1 ptid, often used to indicate either an error condition
- or a "don't care" condition, i.e, "run all threads." */
-extern ptid_t minus_one_ptid;
-
-/* The null or zero ptid, often used to indicate no process. */
-extern ptid_t null_ptid;
+/* A deleter for infcall_suspend_state that calls
+ restore_infcall_suspend_state. */
+struct infcall_suspend_state_deleter
+{
+ void operator() (struct infcall_suspend_state *state) const
+ {
+ restore_infcall_suspend_state (state);
+ }
+};
-/* Attempt to find and return an existing ptid with the given PID, LWP,
- and TID components. If none exists, create a new one and return
- that. */
-ptid_t ptid_build (int pid, long lwp, long tid);
+/* A unique_ptr specialization for infcall_suspend_state. */
+typedef std::unique_ptr<infcall_suspend_state, infcall_suspend_state_deleter>
+ infcall_suspend_state_up;
-/* Find/Create a ptid from just a pid. */
-ptid_t pid_to_ptid (int pid);
+extern infcall_suspend_state_up save_infcall_suspend_state ();
-/* Fetch the pid (process id) component from a ptid. */
-int ptid_get_pid (ptid_t ptid);
+/* A deleter for infcall_control_state that calls
+ restore_infcall_control_state. */
+struct infcall_control_state_deleter
+{
+ void operator() (struct infcall_control_state *state) const
+ {
+ restore_infcall_control_state (state);
+ }
+};
-/* Fetch the lwp (lightweight process) component from a ptid. */
-long ptid_get_lwp (ptid_t ptid);
+/* A unique_ptr specialization for infcall_control_state. */
+typedef std::unique_ptr<infcall_control_state, infcall_control_state_deleter>
+ infcall_control_state_up;
-/* Fetch the tid (thread id) component from a ptid. */
-long ptid_get_tid (ptid_t ptid);
+extern infcall_control_state_up save_infcall_control_state ();
-/* Compare two ptids to see if they are equal */
-extern int ptid_equal (ptid_t p1, ptid_t p2);
+extern void discard_infcall_suspend_state (struct infcall_suspend_state *);
+extern void discard_infcall_control_state (struct infcall_control_state *);
-/* Save value of inferior_ptid so that it may be restored by
- a later call to do_cleanups(). Returns the struct cleanup
- pointer needed for later doing the cleanup. */
-extern struct cleanup * save_inferior_ptid (void);
+extern readonly_detached_regcache *
+ get_infcall_suspend_state_regcache (struct infcall_suspend_state *);
extern void set_sigint_trap (void);
extern void clear_sigint_trap (void);
-extern void set_sigio_trap (void);
-
-extern void clear_sigio_trap (void);
-
/* Set/get file name for default use for standard in/out in the inferior. */
extern void set_inferior_io_terminal (const char *terminal_name);
extern const char *get_inferior_io_terminal (void);
/* Collected pid, tid, etc. of the debugged inferior. When there's
- no inferior, PIDGET (inferior_ptid) will be 0. */
+ no inferior, inferior_ptid.pid () will be 0. */
extern ptid_t inferior_ptid;
-/* Is the inferior running right now, as a result of a 'run&',
- 'continue&' etc command? This is used in asycn gdb to determine
- whether a command that the user enters while the target is running
- is allowed or not. */
-extern int target_executing;
+extern void generic_mourn_inferior (void);
-/* Are we simulating synchronous execution? This is used in async gdb
- to implement the 'run', 'continue' etc commands, which will not
- redisplay the prompt until the execution is actually over. */
-extern int sync_execution;
+extern CORE_ADDR unsigned_pointer_to_address (struct gdbarch *gdbarch,
+ struct type *type,
+ const gdb_byte *buf);
+extern void unsigned_address_to_pointer (struct gdbarch *gdbarch,
+ struct type *type, gdb_byte *buf,
+ CORE_ADDR addr);
+extern CORE_ADDR signed_pointer_to_address (struct gdbarch *gdbarch,
+ struct type *type,
+ const gdb_byte *buf);
+extern void address_to_signed_pointer (struct gdbarch *gdbarch,
+ struct type *type, gdb_byte *buf,
+ CORE_ADDR addr);
-/* This is only valid when inferior_ptid is non-zero.
+extern void reopen_exec_file (void);
- If this is 0, then exec events should be noticed and responded to
- by the debugger (i.e., be reported to the user).
+/* From misc files */
- If this is > 0, then that many subsequent exec events should be
- ignored (i.e., not be reported to the user).
- */
-extern int inferior_ignoring_startup_exec_events;
+extern void default_print_registers_info (struct gdbarch *gdbarch,
+ struct ui_file *file,
+ struct frame_info *frame,
+ int regnum, int all);
-/* This is only valid when inferior_ignoring_startup_exec_events is
- zero.
+/* Default implementation of gdbarch_print_float_info. Print
+ the values of all floating point registers. */
- Some targets (stupidly) report more than one exec event per actual
- call to an event() system call. If only the last such exec event
- need actually be noticed and responded to by the debugger (i.e.,
- be reported to the user), then this is the number of "leading"
- exec events which should be ignored.
- */
-extern int inferior_ignoring_leading_exec_events;
+extern void default_print_float_info (struct gdbarch *gdbarch,
+ struct ui_file *file,
+ struct frame_info *frame,
+ const char *args);
-/* Inferior environment. */
+extern void child_terminal_info (struct target_ops *self, const char *, int);
-extern struct gdb_environ *inferior_environ;
+extern void info_terminal_command (char *, int);
-extern void clear_proceed_status (void);
+extern void child_terminal_ours (struct target_ops *self);
-extern void proceed (CORE_ADDR, enum target_signal, int);
+extern void child_terminal_ours_for_output (struct target_ops *self);
-/* When set, stop the 'step' command if we enter a function which has
- no line number information. The normal behavior is that we step
- over such function. */
-extern int step_stop_if_no_debug;
+extern void child_terminal_inferior (struct target_ops *self);
-extern void generic_mourn_inferior (void);
+extern void child_terminal_save_inferior (struct target_ops *self);
-extern void terminal_save_ours (void);
+extern void child_terminal_init (struct target_ops *self);
-extern void terminal_ours (void);
+extern void child_terminal_init_with_pgrp (int pgrp);
-extern CORE_ADDR read_pc (void);
+extern void child_pass_ctrlc (struct target_ops *self);
-extern CORE_ADDR read_pc_pid (ptid_t);
+extern void child_interrupt (struct target_ops *self);
-extern void write_pc (CORE_ADDR);
+/* From fork-child.c */
-extern void write_pc_pid (CORE_ADDR, ptid_t);
+/* Helper function to call STARTUP_INFERIOR with PID and NUM_TRAPS.
+ This function already calls set_executing. Return the ptid_t from
+ STARTUP_INFERIOR. */
+extern ptid_t gdb_startup_inferior (pid_t pid, int num_traps);
-extern CORE_ADDR unsigned_pointer_to_address (struct type *type,
- const gdb_byte *buf);
-extern void unsigned_address_to_pointer (struct type *type, gdb_byte *buf,
- CORE_ADDR addr);
-extern CORE_ADDR signed_pointer_to_address (struct type *type,
- const gdb_byte *buf);
-extern void address_to_signed_pointer (struct type *type, gdb_byte *buf,
- CORE_ADDR addr);
+extern char *construct_inferior_arguments (int, char **);
-extern void wait_for_inferior (void);
+/* From infcmd.c */
-extern void fetch_inferior_event (void *);
+/* Initial inferior setup. Determines the exec file is not yet known,
+ takes any necessary post-attaching actions, fetches the target
+ description and syncs the shared library list. */
-extern void init_wait_for_inferior (void);
+extern void setup_inferior (int from_tty);
-extern void close_exec_file (void);
+extern void post_create_inferior (struct target_ops *, int);
-extern void reopen_exec_file (void);
+extern void attach_command (const char *, int);
-/* The `resume' routine should only be called in special circumstances.
- Normally, use `proceed', which handles a lot of bookkeeping. */
+extern const char *get_inferior_args (void);
-extern void resume (int, enum target_signal);
+extern void set_inferior_args (const char *);
-/* From misc files */
+extern void set_inferior_args_vector (int, char **);
-extern void default_print_registers_info (struct gdbarch *gdbarch,
- struct ui_file *file,
- struct frame_info *frame,
- int regnum, int all);
+extern void registers_info (const char *, int);
-extern void child_terminal_info (char *, int);
+extern void continue_1 (int all_threads);
-extern void term_info (char *, int);
+extern void interrupt_target_1 (int all_threads);
-extern void terminal_ours_for_output (void);
+extern void delete_longjmp_breakpoint_cleanup (void *arg);
-extern void terminal_inferior (void);
+extern void detach_command (const char *, int);
-extern void terminal_init_inferior (void);
+extern void notice_new_inferior (struct thread_info *, int, int);
-extern void terminal_init_inferior_with_pgrp (int pgrp);
+extern struct value *get_return_value (struct value *function,
+ struct type *value_type);
-/* From procfs.c */
+/* Prepare for execution command. TARGET is the target that will run
+ the command. BACKGROUND determines whether this is a foreground
+ (synchronous) or background (asynchronous) command. */
-extern int proc_iterate_over_mappings (int (*)(int, CORE_ADDR));
+extern void prepare_execution_command (struct target_ops *target,
+ int background);
-extern ptid_t procfs_first_available (void);
+/* Whether to start up the debuggee under a shell.
-/* From fork-child.c */
+ If startup-with-shell is set, GDB's "run" will attempt to start up
+ the debuggee under a shell.
-extern void fork_inferior (char *, char *, char **,
- void (*)(void),
- void (*)(int), void (*)(void), char *);
+ This is in order for argument-expansion to occur. E.g.,
+ (gdb) run *
-extern void startup_inferior (int);
+ The "*" gets expanded by the shell into a list of files.
-extern char *construct_inferior_arguments (struct gdbarch *, int, char **);
+ While this is a nice feature, it may be handy to bypass the shell
+ in some cases. To disable this feature, do "set startup-with-shell
+ false".
-/* From inflow.c */
+ The catch-exec traps expected during start-up will be one more if
+ the target is started up with a shell. */
+extern int startup_with_shell;
-extern void new_tty_prefork (const char *);
+/* Nonzero if stopped due to completion of a stack dummy routine. */
-extern int gdb_has_a_terminal (void);
+extern enum stop_stack_kind stop_stack_dummy;
-/* From infrun.c */
+/* Nonzero if program stopped due to a random (unexpected) signal in
+ inferior process. */
-extern void start_remote (int from_tty);
+extern int stopped_by_random_signal;
-extern void normal_stop (void);
+/* Print notices on inferior events (attach, detach, etc.), set with
+ `set print inferior-events'. */
+extern int print_inferior_events;
-extern int signal_stop_state (int);
+/* STEP_OVER_ALL means step over all subroutine calls.
+ STEP_OVER_UNDEBUGGABLE means step over calls to undebuggable functions.
+ STEP_OVER_NONE means don't step over any subroutine calls. */
-extern int signal_print_state (int);
+enum step_over_calls_kind
+ {
+ STEP_OVER_NONE,
+ STEP_OVER_ALL,
+ STEP_OVER_UNDEBUGGABLE
+ };
-extern int signal_pass_state (int);
+/* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
+ will handle it themselves. STOP_QUIETLY is used when running in
+ the shell before the child program has been exec'd and when running
+ through shared library loading. STOP_QUIETLY_REMOTE is used when
+ setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
+ except that there is no need to hide a signal. */
-extern int signal_stop_update (int, int);
+/* STOP_QUIETLY_NO_SIGSTOP is used to handle a tricky situation with attach.
+ When doing an attach, the kernel stops the debuggee with a SIGSTOP.
+ On newer GNU/Linux kernels (>= 2.5.61) the handling of SIGSTOP for
+ a ptraced process has changed. Earlier versions of the kernel
+ would ignore these SIGSTOPs, while now SIGSTOP is treated like any
+ other signal, i.e. it is not muffled.
-extern int signal_print_update (int, int);
+ If the gdb user does a 'continue' after the 'attach', gdb passes
+ the global variable stop_signal (which stores the signal from the
+ attach, SIGSTOP) to the ptrace(PTRACE_CONT,...) call. This is
+ problematic, because the kernel doesn't ignore such SIGSTOP
+ now. I.e. it is reported back to gdb, which in turn presents it
+ back to the user.
-extern int signal_pass_update (int, int);
+ To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
+ gdb to clear the value of stop_signal after the attach, so that it
+ is not passed back down to the kernel. */
-extern void get_last_target_status(ptid_t *ptid,
- struct target_waitstatus *status);
+enum stop_kind
+ {
+ NO_STOP_QUIETLY = 0,
+ STOP_QUIETLY,
+ STOP_QUIETLY_REMOTE,
+ STOP_QUIETLY_NO_SIGSTOP
+ };
-extern void follow_inferior_reset_breakpoints (void);
+\f
+/* Possible values for gdbarch_call_dummy_location. */
+#define ON_STACK 1
+#define AT_ENTRY_POINT 4
-/* From infcmd.c */
+/* Base class for target-specific inferior data. */
-extern void tty_command (char *, int);
+struct private_inferior
+{
+ virtual ~private_inferior () = 0;
+};
-extern void post_create_inferior (struct target_ops *, int);
+/* Inferior process specific part of `struct infcall_control_state'.
-extern void attach_command (char *, int);
+ Inferior thread counterpart is `struct thread_control_state'. */
-extern char *get_inferior_args (void);
+struct inferior_control_state
+{
+ inferior_control_state ()
+ : stop_soon (NO_STOP_QUIETLY)
+ {
+ }
-extern char *set_inferior_args (char *);
+ explicit inferior_control_state (enum stop_kind when)
+ : stop_soon (when)
+ {
+ }
+
+ /* See the definition of stop_kind above. */
+ enum stop_kind stop_soon;
+};
+
+/* Return a pointer to the current inferior. */
+extern inferior *current_inferior ();
+
+extern void set_current_inferior (inferior *);
+
+/* GDB represents the state of each program execution with an object
+ called an inferior. An inferior typically corresponds to a process
+ but is more general and applies also to targets that do not have a
+ notion of processes. Each run of an executable creates a new
+ inferior, as does each attachment to an existing process.
+ Inferiors have unique internal identifiers that are different from
+ target process ids. Each inferior may in turn have multiple
+ threads running in it.
+
+ Inferiors are intrusively refcounted objects. Unlike thread
+ objects, being the user-selected inferior is considered a strong
+ reference and is thus accounted for in the inferior object's
+ refcount (see set_current_inferior). When GDB needs to remember
+ the selected inferior to later restore it, GDB temporarily bumps
+ the inferior object's refcount, to prevent something deleting the
+ inferior object before reverting back (e.g., due to a
+ "remove-inferiors" command (see
+ make_cleanup_restore_current_thread). All other inferior
+ references are considered weak references. Inferiors are always
+ listed exactly once in the inferior list, so placing an inferior in
+ the inferior list is an implicit, not counted strong reference. */
+
+class inferior : public refcounted_object
+{
+public:
+ explicit inferior (int pid);
+ ~inferior ();
+
+ /* Returns true if we can delete this inferior. */
+ bool deletable () const { return refcount () == 0; }
+
+ /* Pointer to next inferior in singly-linked list of inferiors. */
+ struct inferior *next = NULL;
+
+ /* Convenient handle (GDB inferior id). Unique across all
+ inferiors. */
+ int num = 0;
+
+ /* Actual target inferior id, usually, a process id. This matches
+ the ptid_t.pid member of threads of this inferior. */
+ int pid = 0;
+ /* True if the PID was actually faked by GDB. */
+ bool fake_pid_p = false;
+
+ /* The highest thread number this inferior ever had. */
+ int highest_thread_num = 0;
+
+ /* State of GDB control of inferior process execution.
+ See `struct inferior_control_state'. */
+ inferior_control_state control;
+
+ /* True if this was an auto-created inferior, e.g. created from
+ following a fork; false, if this inferior was manually added by
+ the user, and we should not attempt to prune it
+ automatically. */
+ bool removable = false;
+
+ /* The address space bound to this inferior. */
+ struct address_space *aspace = NULL;
+
+ /* The program space bound to this inferior. */
+ struct program_space *pspace = NULL;
+
+ /* The arguments string to use when running. */
+ char *args = NULL;
+
+ /* The size of elements in argv. */
+ int argc = 0;
+
+ /* The vector version of arguments. If ARGC is nonzero,
+ then we must compute ARGS from this (via the target).
+ This is always coming from main's argv and therefore
+ should never be freed. */
+ char **argv = NULL;
+
+ /* The current working directory that will be used when starting
+ this inferior. */
+ gdb::unique_xmalloc_ptr<char> cwd;
+
+ /* The name of terminal device to use for I/O. */
+ char *terminal = NULL;
+
+ /* The terminal state as set by the last target_terminal::terminal_*
+ call. */
+ target_terminal_state terminal_state = target_terminal_state::is_ours;
+
+ /* Environment to use for running inferior,
+ in format described in environ.h. */
+ gdb_environ environment;
+
+ /* True if this child process was attached rather than forked. */
+ bool attach_flag = false;
+
+ /* If this inferior is a vfork child, then this is the pointer to
+ its vfork parent, if GDB is still attached to it. */
+ inferior *vfork_parent = NULL;
+
+ /* If this process is a vfork parent, this is the pointer to the
+ child. Since a vfork parent is left frozen by the kernel until
+ the child execs or exits, a process can only have one vfork child
+ at a given time. */
+ inferior *vfork_child = NULL;
+
+ /* True if this inferior should be detached when it's vfork sibling
+ exits or execs. */
+ bool pending_detach = false;
-extern void set_inferior_args_vector (int, char **);
+ /* True if this inferior is a vfork parent waiting for a vfork child
+ not under our control to be done with the shared memory region,
+ either by exiting or execing. */
+ bool waiting_for_vfork_done = false;
+
+ /* True if we're in the process of detaching from this inferior. */
+ bool detaching = false;
-extern void registers_info (char *, int);
+ /* What is left to do for an execution command after any thread of
+ this inferior stops. For continuations associated with a
+ specific thread, see `struct thread_info'. */
+ continuation *continuations = NULL;
-extern void nexti_command (char *, int);
+ /* True if setup_inferior wasn't called for this inferior yet.
+ Until that is done, we must not access inferior memory or
+ registers, as we haven't determined the target
+ architecture/description. */
+ bool needs_setup = false;
-extern void stepi_command (char *, int);
+ /* Private data used by the target vector implementation. */
+ std::unique_ptr<private_inferior> priv;
-extern void continue_command (char *, int);
+ /* HAS_EXIT_CODE is true if the inferior exited with an exit code.
+ In this case, the EXIT_CODE field is also valid. */
+ bool has_exit_code = false;
+ LONGEST exit_code = 0;
-extern void interrupt_target_command (char *args, int from_tty);
+ /* Default flags to pass to the symbol reading functions. These are
+ used whenever a new objfile is created. */
+ symfile_add_flags symfile_flags = 0;
-/* Last signal that the inferior received (why it stopped). */
+ /* Info about an inferior's target description (if it's fetched; the
+ user supplied description's filename, if any; etc.). */
+ target_desc_info *tdesc_info = NULL;
-extern enum target_signal stop_signal;
+ /* The architecture associated with the inferior through the
+ connection to the target.
-/* Address at which inferior stopped. */
+ The architecture vector provides some information that is really
+ a property of the inferior, accessed through a particular target:
+ ptrace operations; the layout of certain RSP packets; the
+ solib_ops vector; etc. To differentiate architecture accesses to
+ per-inferior/target properties from
+ per-thread/per-frame/per-objfile properties, accesses to
+ per-inferior/target properties should be made through
+ this gdbarch. */
+ struct gdbarch *gdbarch = NULL;
-extern CORE_ADDR stop_pc;
+ /* Per inferior data-pointers required by other GDB modules. */
+ REGISTRY_FIELDS;
+};
-/* Chain containing status of breakpoint(s) that we have stopped at. */
+/* Keep a registry of per-inferior data-pointers required by other GDB
+ modules. */
-extern bpstat stop_bpstat;
+DECLARE_REGISTRY (inferior);
-/* Flag indicating that a command has proceeded the inferior past the
- current breakpoint. */
+/* Add an inferior to the inferior list, print a message that a new
+ inferior is found, and return the pointer to the new inferior.
+ Caller may use this pointer to initialize the private inferior
+ data. */
+extern struct inferior *add_inferior (int pid);
-extern int breakpoint_proceeded;
+/* Same as add_inferior, but don't print new inferior notifications to
+ the CLI. */
+extern struct inferior *add_inferior_silent (int pid);
-/* Nonzero if stopped due to a step command. */
+extern void delete_inferior (struct inferior *todel);
-extern int stop_step;
+/* Delete an existing inferior list entry, due to inferior detaching. */
+extern void detach_inferior (inferior *inf);
-/* Nonzero if stopped due to completion of a stack dummy routine. */
+extern void exit_inferior (inferior *inf);
-extern int stop_stack_dummy;
+extern void exit_inferior_silent (inferior *inf);
-/* Nonzero if program stopped due to a random (unexpected) signal in
- inferior process. */
+extern void exit_inferior_num_silent (int num);
-extern int stopped_by_random_signal;
+extern void inferior_appeared (struct inferior *inf, int pid);
-/* Range to single step within.
- If this is nonzero, respond to a single-step signal
- by continuing to step if the pc is in this range.
+/* Get rid of all inferiors. */
+extern void discard_all_inferiors (void);
- If step_range_start and step_range_end are both 1, it means to step for
- a single instruction (FIXME: it might clean up wait_for_inferior in a
- minor way if this were changed to the address of the instruction and
- that address plus one. But maybe not.). */
+/* Search function to lookup an inferior by target 'pid'. */
+extern struct inferior *find_inferior_pid (int pid);
-extern CORE_ADDR step_range_start; /* Inclusive */
-extern CORE_ADDR step_range_end; /* Exclusive */
+/* Search function to lookup an inferior whose pid is equal to 'ptid.pid'. */
+extern struct inferior *find_inferior_ptid (ptid_t ptid);
-/* Stack frame address as of when stepping command was issued.
- This is how we know when we step into a subroutine call,
- and how to set the frame for the breakpoint used to step out. */
+/* Search function to lookup an inferior by GDB 'num'. */
+extern struct inferior *find_inferior_id (int num);
-extern struct frame_id step_frame_id;
+/* Find an inferior bound to PSPACE, giving preference to the current
+ inferior. */
+extern struct inferior *
+ find_inferior_for_program_space (struct program_space *pspace);
-/* 1 means step over all subroutine calls.
- -1 means step over calls to undebuggable functions. */
+/* Inferior iterator function.
-enum step_over_calls_kind
- {
- STEP_OVER_NONE,
- STEP_OVER_ALL,
- STEP_OVER_UNDEBUGGABLE
- };
+ Calls a callback function once for each inferior, so long as the
+ callback function returns false. If the callback function returns
+ true, the iteration will end and the current inferior will be
+ returned. This can be useful for implementing a search for a
+ inferior with arbitrary attributes, or for applying some operation
+ to every inferior.
-extern enum step_over_calls_kind step_over_calls;
+ It is safe to delete the iterated inferior from the callback. */
+extern struct inferior *iterate_over_inferiors (int (*) (struct inferior *,
+ void *),
+ void *);
-/* If stepping, nonzero means step count is > 1
- so don't print frame next time inferior stops
- if it stops due to stepping. */
+/* Returns true if the inferior list is not empty. */
+extern int have_inferiors (void);
-extern int step_multi;
+/* Returns the number of live inferiors (real live processes). */
+extern int number_of_live_inferiors (void);
-/* Nonzero means expecting a trap and caller will handle it
- themselves. It is used when running in the shell before the child
- program has been exec'd; and when running some kinds of remote
- stuff (FIXME?). */
+/* Returns true if there are any live inferiors in the inferior list
+ (not cores, not executables, real live processes). */
+extern int have_live_inferiors (void);
-/* It is also used after attach, due to attaching to a process. This
- is a bit trickier. When doing an attach, the kernel stops the
- debuggee with a SIGSTOP. On newer GNU/Linux kernels (>= 2.5.61)
- the handling of SIGSTOP for a ptraced process has changed. Earlier
- versions of the kernel would ignore these SIGSTOPs, while now
- SIGSTOP is treated like any other signal, i.e. it is not muffled.
-
- If the gdb user does a 'continue' after the 'attach', gdb passes
- the global variable stop_signal (which stores the signal from the
- attach, SIGSTOP) to the ptrace(PTRACE_CONT,...) call. This is
- problematic, because the kernel doesn't ignore such SIGSTOP
- now. I.e. it is reported back to gdb, which in turn presents it
- back to the user.
-
- To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
- gdb to clear the value of stop_signal after the attach, so that it
- is not passed back down to the kernel. */
+/* Save/restore the current inferior. */
-enum stop_kind
- {
- NO_STOP_QUIETLY = 0,
- STOP_QUIETLY,
- STOP_QUIETLY_NO_SIGSTOP
- };
+class scoped_restore_current_inferior
+{
+public:
+ scoped_restore_current_inferior ()
+ : m_saved_inf (current_inferior ())
+ {}
-extern enum stop_kind stop_soon;
+ ~scoped_restore_current_inferior ()
+ { set_current_inferior (m_saved_inf); }
-/* Nonzero if proceed is being used for a "finish" command or a similar
- situation when stop_registers should be saved. */
+ DISABLE_COPY_AND_ASSIGN (scoped_restore_current_inferior);
-extern int proceed_to_finish;
+private:
+ inferior *m_saved_inf;
+};
-/* Save register contents here when about to pop a stack dummy frame,
- if-and-only-if proceed_to_finish is set.
- Thus this contains the return value from the called function (assuming
- values are returned in a register). */
-extern struct regcache *stop_registers;
+/* Traverse all inferiors. */
-/* Nonzero if the child process in inferior_ptid was attached rather
- than forked. */
+#define ALL_INFERIORS(I) \
+ for ((I) = inferior_list; (I); (I) = (I)->next)
-extern int attach_flag;
-\f
-/* Possible values for gdbarch_call_dummy_location. */
-#define ON_STACK 1
-#define AT_ENTRY_POINT 4
-#define AT_SYMBOL 5
+/* Traverse all non-exited inferiors. */
+
+#define ALL_NON_EXITED_INFERIORS(I) \
+ ALL_INFERIORS (I) \
+ if ((I)->pid != 0)
+
+extern struct inferior *inferior_list;
+
+/* Prune away automatically added inferiors that aren't required
+ anymore. */
+extern void prune_inferiors (void);
+
+extern int number_of_inferiors (void);
+
+extern struct inferior *add_inferior_with_spaces (void);
+
+/* Print the current selected inferior. */
+extern void print_selected_inferior (struct ui_out *uiout);
-/* If STARTUP_WITH_SHELL is set, GDB's "run"
- will attempts to start up the debugee under a shell.
- This is in order for argument-expansion to occur. E.g.,
- (gdb) run *
- The "*" gets expanded by the shell into a list of files.
- While this is a nice feature, it turns out to interact badly
- with some of the catch-fork/catch-exec features we have added.
- In particular, if the shell does any fork/exec's before
- the exec of the target program, that can confuse GDB.
- To disable this feature, set STARTUP_WITH_SHELL to 0.
- To enable this feature, set STARTUP_WITH_SHELL to 1.
- The catch-exec traps expected during start-up will
- be 1 if target is not started up with a shell, 2 if it is.
- - RT
- If you disable this, you need to decrement
- START_INFERIOR_TRAPS_EXPECTED in tm.h. */
-#define STARTUP_WITH_SHELL 1
-#if !defined(START_INFERIOR_TRAPS_EXPECTED)
-#define START_INFERIOR_TRAPS_EXPECTED 2
-#endif
#endif /* !defined (INFERIOR_H) */