gdb/tracepoint.h

   1 /* Data structures associated with tracepoints in GDB.
   2    Copyright (C) 1997-2018 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #if !defined (TRACEPOINT_H)
  20 #define TRACEPOINT_H 1
  21
  22 #include "breakpoint.h"
  23 #include "memrange.h"
  24 #include "gdb_vecs.h"
  25
  26 #include <vector>
  27 #include <string>
  28
  29 /* An object describing the contents of a traceframe.  */
  30
  31 struct traceframe_info
  32 {
  33   /* Collected memory.  */
  34   std::vector<mem_range> memory;
  35
  36   /* Collected trace state variables.  */
  37   std::vector<int> tvars;
  38 };
  39
  40 typedef std::unique_ptr<traceframe_info> traceframe_info_up;
  41
  42 /* A trace state variable is a value managed by a target being
  43    traced.  A trace state variable (or tsv for short) can be accessed
  44    and assigned to by tracepoint actions and conditionals, but is not
  45    part of the program being traced, and it doesn't have to be
  46    collected.  Effectively the variables are scratch space for
  47    tracepoints.  */
  48
  49 struct trace_state_variable
  50 {
  51   trace_state_variable (std::string &&name_, int number_)
  52   : name (name_), number (number_)
  53   {}
  54
  55   /* The variable's name.  The user has to prefix with a dollar sign,
  56      but we don't store that internally.  */
  57   std::string name;
  58
  59   /* An id number assigned by GDB, and transmitted to targets.  */
  60   int number = 0;
  61
  62   /* The initial value of a variable is a 64-bit signed integer.  */
  63   LONGEST initial_value = 0;
  64
  65   /* 1 if the value is known, else 0.  The value is known during a
  66      trace run, or in tfind mode if the variable was collected into
  67      the current trace frame.  */
  68   int value_known = 0;
  69
  70   /* The value of a variable is a 64-bit signed integer.  */
  71   LONGEST value = 0;
  72
  73   /* This is true for variables that are predefined and built into
  74      the target.  */
  75   int builtin = 0;
  76  };
  77
  78 /* The trace status encompasses various info about the general state
  79    of the tracing run.  */
  80
  81 enum trace_stop_reason
  82   {
  83     trace_stop_reason_unknown,
  84     trace_never_run,
  85     trace_stop_command,
  86     trace_buffer_full,
  87     trace_disconnected,
  88     tracepoint_passcount,
  89     tracepoint_error
  90   };
  91
  92 struct trace_status
  93 {
  94   /* If the status is coming from a file rather than a live target,
  95      this points at the file's filename.  Otherwise, this is NULL.  */
  96   const char *filename;
  97
  98   /* This is true if the value of the running field is known.  */
  99   int running_known;
 100
 101   /* This is true when the trace experiment is actually running.  */
 102   int running;
 103
 104   enum trace_stop_reason stop_reason;
 105
 106   /* If stop_reason is tracepoint_passcount or tracepoint_error, this
 107      is the (on-target) number of the tracepoint which caused the
 108      stop.  */
 109   int stopping_tracepoint;
 110
 111   /* If stop_reason is tstop_command or tracepoint_error, this is an
 112      arbitrary string that may describe the reason for the stop in
 113      more detail.  */
 114
 115   char *stop_desc;
 116
 117   /* Number of traceframes currently in the buffer.  */
 118
 119   int traceframe_count;
 120
 121   /* Number of traceframes created since start of run.  */
 122
 123   int traceframes_created;
 124
 125   /* Total size of the target's trace buffer.  */
 126
 127   int buffer_size;
 128
 129   /* Unused bytes left in the target's trace buffer.  */
 130
 131   int buffer_free;
 132
 133   /* 1 if the target will continue tracing after disconnection, else
 134      0.  If the target does not report a value, assume 0.  */
 135
 136   int disconnected_tracing;
 137
 138   /* 1 if the target is using a circular trace buffer, else 0.  If the
 139      target does not report a value, assume 0.  */
 140
 141   int circular_buffer;
 142
 143   /* The "name" of the person running the trace.  This is an
 144      arbitrary string.  */
 145
 146   char *user_name;
 147
 148   /* "Notes" about the trace.  This is an arbitrary string not
 149      interpreted by GDBserver in any special way.  */
 150
 151   char *notes;
 152
 153   /* The calendar times at which the trace run started and stopped,
 154      both expressed in microseconds of Unix time.  */
 155
 156   LONGEST start_time;
 157   LONGEST stop_time;
 158 };
 159
 160 struct trace_status *current_trace_status (void);
 161
 162 extern char *default_collect;
 163
 164 extern int trace_regblock_size;
 165
 166 extern const char *stop_reason_names[];
 167
 168 /* Struct to collect random info about tracepoints on the target.  */
 169
 170 struct uploaded_tp
 171 {
 172   int number = 0;
 173   enum bptype type = bp_none;
 174   ULONGEST addr = 0;
 175   int enabled = 0;
 176   int step = 0;
 177   int pass = 0;
 178   int orig_size = 0;
 179
 180   /* String that is the encoded form of the tracepoint's condition.  */
 181   char *cond = nullptr;
 182
 183   /* Vectors of strings that are the encoded forms of a tracepoint's
 184      actions.  */
 185   std::vector<char *> actions;
 186   std::vector<char *> step_actions;
 187
 188   /* The original string defining the location of the tracepoint.  */
 189   char *at_string = nullptr;
 190
 191   /* The original string defining the tracepoint's condition.  */
 192   char *cond_string = nullptr;
 193
 194   /* List of original strings defining the tracepoint's actions.  */
 195   std::vector<char *> cmd_strings;
 196
 197   /* The tracepoint's current hit count.  */
 198   int hit_count = 0;
 199
 200   /* The tracepoint's current traceframe usage.  */
 201   ULONGEST traceframe_usage = 0;
 202
 203   struct uploaded_tp *next = nullptr;
 204 };
 205
 206 /* Struct recording info about trace state variables on the target.  */
 207
 208 struct uploaded_tsv
 209 {
 210   const char *name;
 211   int number;
 212   LONGEST initial_value;
 213   int builtin;
 214   struct uploaded_tsv *next;
 215 };
 216
 217 /* Struct recording info about a target static tracepoint marker.  */
 218
 219 struct static_tracepoint_marker
 220 {
 221   DISABLE_COPY_AND_ASSIGN (static_tracepoint_marker);
 222
 223   static_tracepoint_marker () = default;
 224   static_tracepoint_marker (static_tracepoint_marker &&) = default;
 225   static_tracepoint_marker &operator= (static_tracepoint_marker &&) = default;
 226
 227   struct gdbarch *gdbarch = NULL;
 228   CORE_ADDR address = 0;
 229
 230   /* The string ID of the marker.  */
 231   std::string str_id;
 232
 233   /* Extra target reported info associated with the marker.  */
 234   std::string extra;
 235 };
 236
 237 struct memrange
 238 {
 239   memrange (int type_, bfd_signed_vma start_, bfd_signed_vma end_)
 240     : type (type_), start (start_), end (end_)
 241   {}
 242
 243   memrange ()
 244   {}
 245
 246   /* memrange_absolute for absolute memory range, else basereg
 247      number.  */
 248   int type;
 249   bfd_signed_vma start;
 250   bfd_signed_vma end;
 251 };
 252
 253 class collection_list
 254 {
 255 public:
 256   collection_list ();
 257
 258   void add_wholly_collected (const char *print_name);
 259
 260   void append_exp (struct expression *exp);
 261
 262   /* Add AEXPR to the list, taking ownership.  */
 263   void add_aexpr (agent_expr_up aexpr);
 264
 265   void add_register (unsigned int regno);
 266   void add_memrange (struct gdbarch *gdbarch,
 267                      int type, bfd_signed_vma base,
 268                      unsigned long len);
 269   void collect_symbol (struct symbol *sym,
 270                        struct gdbarch *gdbarch,
 271                        long frame_regno, long frame_offset,
 272                        CORE_ADDR scope,
 273                        int trace_string);
 274
 275   void add_local_symbols (struct gdbarch *gdbarch, CORE_ADDR pc,
 276                           long frame_regno, long frame_offset, int type,
 277                           int trace_string);
 278   void add_static_trace_data ();
 279
 280   void finish ();
 281
 282   std::vector<std::string> stringify ();
 283
 284   const std::vector<std::string> &wholly_collected ()
 285   { return m_wholly_collected; }
 286
 287   const std::vector<std::string> &computed ()
 288   { return m_computed; }
 289
 290 private:
 291   /* room for up to 256 regs */
 292   unsigned char m_regs_mask[32];
 293
 294   std::vector<memrange> m_memranges;
 295
 296   std::vector<agent_expr_up> m_aexprs;
 297
 298   /* True is the user requested a collection of "$_sdata", "static
 299      tracepoint data".  */
 300   bool m_strace_data;
 301
 302   /* A set of names of wholly collected objects.  */
 303   std::vector<std::string> m_wholly_collected;
 304   /* A set of computed expressions.  */
 305   std::vector<std::string> m_computed;
 306 };
 307
 308 extern void
 309   parse_static_tracepoint_marker_definition (const char *line, const char **pp,
 310                                              static_tracepoint_marker *marker);
 311
 312 /* A hook used to notify the UI of tracepoint operations.  */
 313
 314 extern void (*deprecated_trace_find_hook) (char *arg, int from_tty);
 315 extern void (*deprecated_trace_start_stop_hook) (int start, int from_tty);
 316
 317 /* Returns the current traceframe number.  */
 318 extern int get_traceframe_number (void);
 319
 320 /* Returns the tracepoint number for current traceframe.  */
 321 extern int get_tracepoint_number (void);
 322
 323 /* Make the traceframe NUM be the current trace frame, all the way to
 324    the target, and flushes all global state (register/frame caches,
 325    etc.).  */
 326 extern void set_current_traceframe (int num);
 327
 328 struct scoped_restore_current_traceframe
 329 {
 330   scoped_restore_current_traceframe ();
 331
 332   ~scoped_restore_current_traceframe ()
 333   {
 334     set_current_traceframe (m_traceframe_number);
 335   }
 336
 337   DISABLE_COPY_AND_ASSIGN (scoped_restore_current_traceframe);
 338
 339 private:
 340
 341   /* The traceframe we were inspecting.  */
 342   int m_traceframe_number;
 343 };
 344
 345 void free_actions (struct breakpoint *);
 346
 347 extern const char *decode_agent_options (const char *exp, int *trace_string);
 348
 349 extern void encode_actions (struct bp_location *tloc,
 350                             struct collection_list *tracepoint_list,
 351                             struct collection_list *stepping_list);
 352
 353 extern void encode_actions_rsp (struct bp_location *tloc,
 354                                 std::vector<std::string> *tdp_actions,
 355                                 std::vector<std::string> *stepping_actions);
 356
 357 extern void validate_actionline (const char *, struct breakpoint *);
 358 extern void validate_trace_state_variable_name (const char *name);
 359
 360 extern struct trace_state_variable *find_trace_state_variable (const char *name);
 361 extern struct trace_state_variable *
 362   find_trace_state_variable_by_number (int number);
 363
 364 extern struct trace_state_variable *create_trace_state_variable (const char *name);
 365
 366 extern int encode_source_string (int num, ULONGEST addr,
 367                                  const char *srctype, const char *src,
 368                                  char *buf, int buf_size);
 369
 370 extern void parse_trace_status (const char *line, struct trace_status *ts);
 371
 372 extern void parse_tracepoint_status (const char *p, struct breakpoint *tp,
 373                                      struct uploaded_tp *utp);
 374
 375 extern void parse_tracepoint_definition (const char *line,
 376                                          struct uploaded_tp **utpp);
 377 extern void parse_tsv_definition (const char *line, struct uploaded_tsv **utsvp);
 378
 379 extern struct uploaded_tp *get_uploaded_tp (int num, ULONGEST addr,
 380                                             struct uploaded_tp **utpp);
 381 extern void free_uploaded_tps (struct uploaded_tp **utpp);
 382
 383 extern struct uploaded_tsv *get_uploaded_tsv (int num,
 384                                               struct uploaded_tsv **utsvp);
 385 extern void free_uploaded_tsvs (struct uploaded_tsv **utsvp);
 386 extern struct tracepoint *create_tracepoint_from_upload (struct uploaded_tp *utp);
 387 extern void merge_uploaded_tracepoints (struct uploaded_tp **utpp);
 388 extern void merge_uploaded_trace_state_variables (struct uploaded_tsv **utsvp);
 389
 390 extern void query_if_trace_running (int from_tty);
 391 extern void disconnect_tracing (void);
 392 extern void trace_reset_local_state (void);
 393
 394 extern void check_trace_running (struct trace_status *);
 395
 396 extern void start_tracing (const char *notes);
 397 extern void stop_tracing (const char *notes);
 398
 399 extern void trace_status_mi (int on_stop);
 400
 401 extern void tvariables_info_1 (void);
 402 extern void save_trace_state_variables (struct ui_file *fp);
 403
 404 /* Enumeration of the kinds of traceframe searches that a target may
 405    be able to perform.  */
 406
 407 enum trace_find_type
 408 {
 409   tfind_number,
 410   tfind_pc,
 411   tfind_tp,
 412   tfind_range,
 413   tfind_outside,
 414 };
 415
 416 extern void tfind_1 (enum trace_find_type type, int num,
 417                      CORE_ADDR addr1, CORE_ADDR addr2,
 418                      int from_tty);
 419
 420 extern void trace_save_tfile (const char *filename,
 421                               int target_does_save);
 422 extern void trace_save_ctf (const char *dirname,
 423                             int target_does_save);
 424
 425 extern traceframe_info_up parse_traceframe_info (const char *tframe_info);
 426
 427 extern int traceframe_available_memory (std::vector<mem_range> *result,
 428                                         CORE_ADDR memaddr, ULONGEST len);
 429
 430 extern struct traceframe_info *get_traceframe_info (void);
 431
 432 extern struct bp_location *get_traceframe_location (int *stepping_frame_p);
 433
 434 #endif  /* TRACEPOINT_H */