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, 2008
+ 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009
Free Software Foundation, Inc.
This file is part of GDB.
struct type;
struct gdbarch;
struct regcache;
+struct ui_out;
+struct terminal_info;
/* For bpstat. */
#include "breakpoint.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".
+#include "progspace.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. */
+/* Two structures are used to record inferior state.
+ inferior_thread_state contains state about the program itself like its
+ registers and any signal it received when it last stopped.
+ This state must be restored regardless of how the inferior function call
+ ends (either successfully, or after it hits a breakpoint or signal)
+ if the program is to properly continue where it left off.
+
+ inferior_status contains state regarding gdb's control of the inferior
+ itself like stepping control. It also contains session state like the
+ user's currently selected frame.
+
+ Call these routines around hand called functions, including function calls
+ in conditional breakpoints for example. */
+
+struct inferior_thread_state;
struct inferior_status;
-extern struct inferior_status *save_inferior_status (int);
+extern struct inferior_thread_state *save_inferior_thread_state (void);
+extern struct inferior_status *save_inferior_status (void);
+extern void restore_inferior_thread_state (struct inferior_thread_state *);
extern void restore_inferior_status (struct inferior_status *);
+extern struct cleanup *make_cleanup_restore_inferior_thread_state (struct inferior_thread_state *);
extern struct cleanup *make_cleanup_restore_inferior_status (struct inferior_status *);
+extern void discard_inferior_thread_state (struct inferior_thread_state *);
extern void discard_inferior_status (struct inferior_status *);
-extern void write_inferior_status_register (struct inferior_status
- *inf_status, int regno,
- LONGEST val);
+extern struct regcache *get_inferior_thread_state_regcache (struct inferior_thread_state *);
/* The -1 ptid, often used to indicate either an error condition
or a "don't care" condition, i.e, "run all threads." */
/* Compare two ptids to see if they are equal */
extern int ptid_equal (ptid_t p1, ptid_t p2);
+/* Return true if PTID represents a process id. */
+extern int ptid_is_pid (ptid_t ptid);
+
/* 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 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);
redisplay the prompt until the execution is actually over. */
extern int sync_execution;
-/* 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;
-
/* Inferior environment. */
extern struct gdb_environ *inferior_environ;
extern void proceed (CORE_ADDR, enum target_signal, int);
-extern ptid_t context_switch_to (ptid_t ptid);
+extern int sched_multi;
/* When set, stop the 'step' command if we enter a function which has
no line number information. The normal behavior is that we step
are kept running freely. */
extern int non_stop;
+/* If set (default), when following a fork, GDB will detach from one
+ the fork branches, child or parent. Exactly which branch is
+ detached depends on 'set follow-fork-mode' setting. */
+extern int detach_fork;
+
extern void generic_mourn_inferior (void);
extern void terminal_save_ours (void);
extern void terminal_ours (void);
-extern CORE_ADDR read_pc (void);
-
-extern void write_pc (CORE_ADDR);
-
-extern CORE_ADDR unsigned_pointer_to_address (struct type *type,
+extern CORE_ADDR unsigned_pointer_to_address (struct gdbarch *gdbarch,
+ struct type *type,
const gdb_byte *buf);
-extern void unsigned_address_to_pointer (struct type *type, 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 type *type,
+extern CORE_ADDR signed_pointer_to_address (struct gdbarch *gdbarch,
+ struct type *type,
const gdb_byte *buf);
-extern void address_to_signed_pointer (struct type *type, gdb_byte *buf,
+extern void address_to_signed_pointer (struct gdbarch *gdbarch,
+ struct type *type, gdb_byte *buf,
CORE_ADDR addr);
extern void wait_for_inferior (int treat_exec_as_sigtrap);
extern void terminal_init_inferior_with_pgrp (int pgrp);
-/* From procfs.c */
-
-extern int proc_iterate_over_mappings (int (*)(int, CORE_ADDR));
-
-extern ptid_t procfs_first_available (void);
-
/* From fork-child.c */
-extern void fork_inferior (char *, char *, char **,
- void (*)(void),
- void (*)(int), void (*)(void), char *);
+extern int fork_inferior (char *, char *, char **,
+ void (*)(void),
+ void (*)(int), void (*)(void), char *);
extern void startup_inferior (int);
-extern char *construct_inferior_arguments (struct gdbarch *, int, char **);
-
-/* From inflow.c */
-
-extern void new_tty_prefork (const char *);
-
-extern int gdb_has_a_terminal (void);
+extern char *construct_inferior_arguments (int, char **);
/* From infrun.c */
/* Calls error_is_running if the current thread is running. */
extern void ensure_not_running (void);
+void set_step_info (struct frame_info *frame, struct symtab_and_line sal);
+
/* From infcmd.c */
extern void tty_command (char *, int);
extern void interrupt_target_1 (int all_threads);
-/* Last signal that the inferior received (why it stopped). */
+extern void detach_command (char *, int);
-extern enum target_signal stop_signal;
+extern void notice_new_inferior (ptid_t, int, int);
/* Address at which inferior stopped. */
extern CORE_ADDR stop_pc;
-/* Flag indicating that a command has proceeded the inferior past the
- current breakpoint. */
-
-extern int breakpoint_proceeded;
-
-/* Nonzero if stopped due to a step command. */
-
-extern int stop_step;
-
/* Nonzero if stopped due to completion of a stack dummy routine. */
extern int stop_stack_dummy;
extern int stopped_by_random_signal;
-/* 1 means step over all subroutine calls.
- -1 means step over calls to undebuggable functions. */
+/* 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. */
enum step_over_calls_kind
{
STEP_OVER_UNDEBUGGABLE
};
-/* If stepping, nonzero means step count is > 1
- so don't print frame next time inferior stops
- if it stops due to stepping. */
-
-extern int step_multi;
-
/* 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
STOP_QUIETLY_NO_SIGSTOP
};
-extern enum stop_kind stop_soon;
-
-/* Nonzero if proceed is being used for a "finish" command or a similar
- situation when stop_registers should be saved. */
+/* Reverse execution. */
+enum exec_direction_kind
+ {
+ EXEC_FORWARD,
+ EXEC_REVERSE,
+ EXEC_ERROR
+ };
-extern int proceed_to_finish;
+extern enum exec_direction_kind execution_direction;
-/* Save register contents here when about to pop a stack dummy frame,
- if-and-only-if proceed_to_finish is set.
+/* Save register contents here when executing a "finish" command or are
+ 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;
-/* Nonzero if the child process in inferior_ptid was attached rather
- than forked. */
-
-extern int attach_flag;
-
/* True if we are debugging displaced stepping. */
extern int debug_displaced;
void displaced_step_dump_bytes (struct ui_file *file,
const gdb_byte *buf, size_t len);
-
-/* When set, normal_stop will not call the normal_stop observer. */
-extern int suppress_stop_observer;
-
-/* When set, no calls to target_resumed observer will be made. */
-extern int suppress_resume_observer;
-
\f
/* Possible values for gdbarch_call_dummy_location. */
#define ON_STACK 1
#if !defined(START_INFERIOR_TRAPS_EXPECTED)
#define START_INFERIOR_TRAPS_EXPECTED 2
#endif
+
+struct private_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. */
+
+struct inferior
+{
+ /* Pointer to next inferior in singly-linked list of inferiors. */
+ struct inferior *next;
+
+ /* Convenient handle (GDB inferior id). Unique across all
+ inferiors. */
+ int num;
+
+ /* Actual target inferior id, usually, a process id. This matches
+ the ptid_t.pid member of threads of this inferior. */
+ int pid;
+
+ /* 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. */
+ int removable;
+
+ /* The address space bound to this inferior. */
+ struct address_space *aspace;
+
+ /* The program space bound to this inferior. */
+ struct program_space *pspace;
+
+ /* See the definition of stop_kind above. */
+ enum stop_kind stop_soon;
+
+ /* Nonzero if this child process was attached rather than
+ forked. */
+ int attach_flag;
+
+ /* If this inferior is a vfork child, then this is the pointer to
+ its vfork parent, if GDB is still attached to it. */
+ struct inferior *vfork_parent;
+
+ /* 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. */
+ struct inferior *vfork_child;
+
+ /* True if this inferior should be detached when it's vfork sibling
+ exits or execs. */
+ int pending_detach;
+
+ /* 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. */
+ int waiting_for_vfork_done;
+
+ /* 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'. */
+ struct continuation *continuations;
+
+ /* Private data used by the target vector implementation. */
+ struct private_inferior *private;
+
+ /* We keep a count of the number of times the user has requested a
+ particular syscall to be tracked, and pass this information to the
+ target. This lets capable targets implement filtering directly. */
+
+ /* Number of times that "any" syscall is requested. */
+ int any_syscall_count;
+
+ /* Count of each system call. */
+ VEC(int) *syscalls_counts;
+
+ /* This counts all syscall catch requests, so we can readily determine
+ if any catching is necessary. */
+ int total_syscalls_count;
+
+ /* Per inferior data-pointers required by other GDB modules. */
+ void **data;
+ unsigned num_data;
+};
+
+/* Keep a registry of per-inferior data-pointers required by other GDB
+ modules. */
+
+extern const struct inferior_data *register_inferior_data (void);
+extern const struct inferior_data *register_inferior_data_with_cleanup
+ (void (*cleanup) (struct inferior *, void *));
+extern void clear_inferior_data (struct inferior *inf);
+extern void set_inferior_data (struct inferior *inf,
+ const struct inferior_data *data, void *value);
+extern void *inferior_data (struct inferior *inf,
+ const struct inferior_data *data);
+
+/* Create an empty inferior list, or empty the existing one. */
+extern void init_inferior_list (void);
+
+/* 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);
+
+/* Same as add_inferior, but don't print new inferior notifications to
+ the CLI. */
+extern struct inferior *add_inferior_silent (int pid);
+
+/* Delete an existing inferior list entry, due to inferior exit. */
+extern void delete_inferior (int pid);
+
+/* Same as delete_inferior, but don't print new inferior notifications
+ to the CLI. */
+extern void delete_inferior_silent (int pid);
+
+/* Delete an existing inferior list entry, due to inferior detaching. */
+extern void detach_inferior (int pid);
+
+extern void exit_inferior (int pid);
+
+extern void exit_inferior_silent (int pid);
+
+extern void exit_inferior_num_silent (int num);
+
+extern void inferior_appeared (struct inferior *inf, int pid);
+
+/* Get rid of all inferiors. */
+extern void discard_all_inferiors (void);
+
+/* Translate the integer inferior id (GDB's homegrown id, not the system's)
+ into a "pid" (which may be overloaded with extra inferior information). */
+extern int gdb_inferior_id_to_pid (int);
+
+/* Translate a target 'pid' into the integer inferior id (GDB's
+ homegrown id, not the system's). */
+extern int pid_to_gdb_inferior_id (int pid);
+
+/* Boolean test for an already-known pid. */
+extern int in_inferior_list (int pid);
+
+/* Boolean test for an already-known inferior id (GDB's homegrown id,
+ not the system's). */
+extern int valid_gdb_inferior_id (int num);
+
+/* Search function to lookup an inferior by target 'pid'. */
+extern struct inferior *find_inferior_pid (int pid);
+
+/* Search function to lookup an inferior by GDB 'num'. */
+extern struct inferior *find_inferior_id (int num);
+
+/* Find an inferior bound to PSPACE. */
+extern struct inferior *
+ find_inferior_for_program_space (struct program_space *pspace);
+
+/* Inferior iterator function.
+
+ 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.
+
+ It is safe to delete the iterated inferior from the callback. */
+extern struct inferior *iterate_over_inferiors (int (*) (struct inferior *,
+ void *),
+ void *);
+
+/* Prints the list of inferiors and their details on UIOUT.
+
+ If REQUESTED_INFERIOR is not -1, it's the GDB id of the inferior
+ that should be printed. Otherwise, all inferiors are printed. */
+extern void print_inferior (struct ui_out *uiout, int requested_inferior);
+
+/* Returns true if the inferior list is not empty. */
+extern int have_inferiors (void);
+
+/* 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);
+
+/* Return a pointer to the current inferior. It is an error to call
+ this if there is no current inferior. */
+extern struct inferior *current_inferior (void);
+
+extern void set_current_inferior (struct inferior *);
+
+extern struct cleanup *save_current_inferior (void);
+
+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);
+
#endif /* !defined (INFERIOR_H) */
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