binutils-gdb/gdb/tracepoint.h

/* Data structures associated with tracepoints in GDB.
   Copyright (C) 1997, 1998, 1999, 2000, 2007, 2008, 2009, 2010, 2011
   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 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#if !defined (TRACEPOINT_H)
#define TRACEPOINT_H 1

#include "breakpoint.h"
#include "target.h"
#include "memrange.h"

/* A trace state variable is a value managed by a target being
   traced.  A trace state variable (or tsv for short) can be accessed
   and assigned to by tracepoint actions and conditionals, but is not
   part of the program being traced, and it doesn't have to be
   collected.  Effectively the variables are scratch space for
   tracepoints.  */

struct trace_state_variable
  {
    /* The variable's name.  The user has to prefix with a dollar sign,
       but we don't store that internally.  */
    const char *name;

    /* An id number assigned by GDB, and transmitted to targets.  */
    int number;

    /* The initial value of a variable is a 64-bit signed integer.  */
    LONGEST initial_value;

    /* 1 if the value is known, else 0.  The value is known during a
       trace run, or in tfind mode if the variable was collected into
       the current trace frame.  */
    int value_known;

    /* The value of a variable is a 64-bit signed integer.  */
    LONGEST value;

    /* This is true for variables that are predefined and built into
       the target.  */
    int builtin;
   };

/* The trace status encompasses various info about the general state
   of the tracing run.  */

enum trace_stop_reason
  {
    trace_stop_reason_unknown,
    trace_never_run,
    tstop_command,
    trace_buffer_full,
    trace_disconnected,
    tracepoint_passcount,
    tracepoint_error
  };

struct trace_status
{
  /* This is true if the status is coming from a file rather
     than a live target.  */
  int from_file;

  /* This is true if the value of the running field is known.  */
  int running_known;

  int running;

  enum trace_stop_reason stop_reason;

  /* If stop_reason is tracepoint_passcount or tracepoint_error, this
     is the (on-target) number of the tracepoint which caused the
     stop.  */
  int stopping_tracepoint;

  /* If stop_reason is tracepoint_error, this is a human-readable
     string that describes the error that happened on the target.  */
  char *error_desc;

  /* Number of traceframes currently in the buffer.  */

  int traceframe_count;

  /* Number of traceframes created since start of run.  */

  int traceframes_created;

  /* Total size of the target's trace buffer.  */

  int buffer_size;

  /* Unused bytes left in the target's trace buffer.  */

  int buffer_free;

  /* 1 if the target will continue tracing after disconnection, else
     0.  If the target does not report a value, assume 0.  */

  int disconnected_tracing;

  /* 1 if the target is using a circular trace buffer, else 0.  If the
     target does not report a value, assume 0.  */

  int circular_buffer;
};

struct trace_status *current_trace_status (void);

extern char *default_collect;

/* Struct to collect random info about tracepoints on the target.  */

DEF_VEC_P (char_ptr);

struct uploaded_tp
{
  int number;
  enum bptype type;
  ULONGEST addr;
  int enabled;
  int step;
  int pass;
  int orig_size;

  /* String that is the encoded form of the tracepoint's condition.  */
  char *cond;

  /* Vectors of strings that are the encoded forms of a tracepoint's
     actions.  */
  VEC(char_ptr) *actions;
  VEC(char_ptr) *step_actions;

  /* The original string defining the location of the tracepoint.  */
  char *at_string;

  /* The original string defining the tracepoint's condition.  */
  char *cond_string;

  /* List of original strings defining the tracepoint's actions.  */
  VEC(char_ptr) *cmd_strings;

  struct uploaded_tp *next;
};

/* Struct recording info about trace state variables on the target.  */

struct uploaded_tsv
{
  const char *name;
  int number;
  LONGEST initial_value;
  int builtin;
  struct uploaded_tsv *next;
};

/* Struct recording info about a target static tracepoint marker.  */

struct static_tracepoint_marker
{
  struct gdbarch *gdbarch;
  CORE_ADDR address;

  /* The string ID of the marker.  */
  char *str_id;

  /* Extra target reported info associated with the marker.  */
  char *extra;
};

extern void parse_static_tracepoint_marker_definition
  (char *line, char **pp,
   struct static_tracepoint_marker *marker);
extern void release_static_tracepoint_marker (struct static_tracepoint_marker *);

/* A hook used to notify the UI of tracepoint operations.  */

extern void (*deprecated_trace_find_hook) (char *arg, int from_tty);
extern void (*deprecated_trace_start_stop_hook) (int start, int from_tty);

/* Returns the current traceframe number.  */
extern int get_traceframe_number (void);

/* Make the traceframe NUM be the current GDB trace frame number, and
   do nothing more.  In particular, this does not flush the
   register/frame caches or notify the target about the trace frame
   change, so that is can be used when we need to momentarily access
   live memory.  Targets lazily switch their current traceframe to
   match GDB's traceframe number, at the appropriate times.  */
extern void set_traceframe_number (int);

/* Make the traceframe NUM be the current trace frame, all the way to
   the target, and flushes all global state (register/frame caches,
   etc.).  */
extern void set_current_traceframe (int num);

struct cleanup *make_cleanup_restore_current_traceframe (void);
struct cleanup *make_cleanup_restore_traceframe_number (void);

void free_actions (struct breakpoint *);

extern char *decode_agent_options (char *exp);

extern void validate_actionline (char **, struct breakpoint *);

extern void end_actions_pseudocommand (char *args, int from_tty);
extern void while_stepping_pseudocommand (char *args, int from_tty);

extern struct trace_state_variable *find_trace_state_variable (const char *name);
extern struct trace_state_variable *create_trace_state_variable (const char *name);

extern int encode_source_string (int num, ULONGEST addr,
				 char *srctype, char *src,
				 char *buf, int buf_size);

extern void parse_trace_status (char *line, struct trace_status *ts);

extern void parse_tracepoint_definition (char *line,
					 struct uploaded_tp **utpp);
extern void parse_tsv_definition (char *line, struct uploaded_tsv **utsvp);

extern struct uploaded_tp *get_uploaded_tp (int num, ULONGEST addr,
					    struct uploaded_tp **utpp);
extern struct tracepoint *create_tracepoint_from_upload (struct uploaded_tp *utp);
extern void merge_uploaded_tracepoints (struct uploaded_tp **utpp);
extern void merge_uploaded_trace_state_variables (struct uploaded_tsv **utsvp);

extern void disconnect_tracing (int from_tty);

extern void start_tracing (void);
extern void stop_tracing (void);

extern void trace_status_mi (int on_stop);

extern void tvariables_info_1 (void);
extern void save_trace_state_variables (struct ui_file *fp);

extern void tfind_1 (enum trace_find_type type, int num,
		     ULONGEST addr1, ULONGEST addr2,
		     int from_tty);

extern void trace_save (const char *filename, int target_does_save);

extern struct traceframe_info *parse_traceframe_info (const char *tframe_info);

extern int traceframe_available_memory (VEC(mem_range_s) **result,
					CORE_ADDR memaddr, ULONGEST len);

#endif	/* TRACEPOINT_H */