gdb/tracepoint.h

   1 /* Data structures associated with tracepoints in GDB.
   2    Copyright (C) 1997-2024 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 "gdbsupport/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 std::string 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   gdb::unique_xmalloc_ptr<char[]> cond;
 182
 183   /* Vectors of strings that are the encoded forms of a tracepoint's
 184      actions.  */
 185   std::vector<gdb::unique_xmalloc_ptr<char[]>> actions;
 186   std::vector<gdb::unique_xmalloc_ptr<char[]>> step_actions;
 187
 188   /* The original string defining the location of the tracepoint.  */
 189   gdb::unique_xmalloc_ptr<char[]> at_string;
 190
 191   /* The original string defining the tracepoint's condition.  */
 192   gdb::unique_xmalloc_ptr<char[]> cond_string;
 193
 194   /* List of original strings defining the tracepoint's actions.  */
 195   std::vector<gdb::unique_xmalloc_ptr<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 (std::string &&exp);
 261
 262   /* Add AEXPR to the list, taking ownership.  */
 263   void add_aexpr (agent_expr_up aexpr);
 264
 265   void add_remote_register (unsigned int regno);
 266   void add_ax_registers (struct agent_expr *aexpr);
 267   void add_local_register (struct gdbarch *gdbarch,
 268                            unsigned int regno,
 269                            CORE_ADDR scope);
 270   void add_memrange (struct gdbarch *gdbarch,
 271                      int type, bfd_signed_vma base,
 272                      unsigned long len, CORE_ADDR scope);
 273   void collect_symbol (struct symbol *sym,
 274                        struct gdbarch *gdbarch,
 275                        long frame_regno, long frame_offset,
 276                        CORE_ADDR scope,
 277                        int trace_string);
 278
 279   void add_local_symbols (struct gdbarch *gdbarch, CORE_ADDR pc,
 280                           long frame_regno, long frame_offset, int type,
 281                           int trace_string);
 282   void add_static_trace_data ();
 283
 284   void finish ();
 285
 286   std::vector<std::string> stringify ();
 287
 288   const std::vector<std::string> &wholly_collected ()
 289   { return m_wholly_collected; }
 290
 291   const std::vector<std::string> &computed ()
 292   { return m_computed; }
 293
 294 private:
 295   /* We need the allocator zero-initialize the mask, so we don't use
 296      gdb::byte_vector.  */
 297   std::vector<unsigned char> m_regs_mask;
 298
 299   std::vector<memrange> m_memranges;
 300
 301   std::vector<agent_expr_up> m_aexprs;
 302
 303   /* True is the user requested a collection of "$_sdata", "static
 304      tracepoint data".  */
 305   bool m_strace_data;
 306
 307   /* A set of names of wholly collected objects.  */
 308   std::vector<std::string> m_wholly_collected;
 309   /* A set of computed expressions.  */
 310   std::vector<std::string> m_computed;
 311 };
 312
 313 extern void
 314   parse_static_tracepoint_marker_definition (const char *line, const char **pp,
 315                                              static_tracepoint_marker *marker);
 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 extern const char *decode_agent_options (const char *exp, int *trace_string);
 346
 347 extern void encode_actions (struct bp_location *tloc,
 348                             struct collection_list *tracepoint_list,
 349                             struct collection_list *stepping_list);
 350
 351 extern void encode_actions_rsp (struct bp_location *tloc,
 352                                 std::vector<std::string> *tdp_actions,
 353                                 std::vector<std::string> *stepping_actions);
 354
 355 extern void validate_actionline (const char *, tracepoint *);
 356 extern void validate_trace_state_variable_name (const char *name);
 357
 358 extern struct trace_state_variable *find_trace_state_variable (const char *name);
 359 extern struct trace_state_variable *
 360   find_trace_state_variable_by_number (int number);
 361
 362 extern struct trace_state_variable *create_trace_state_variable (const char *name);
 363
 364 extern int encode_source_string (int num, ULONGEST addr,
 365                                  const char *srctype, const char *src,
 366                                  char *buf, int buf_size);
 367
 368 extern void parse_trace_status (const char *line, struct trace_status *ts);
 369
 370 extern void parse_tracepoint_status (const char *p, tracepoint *tp,
 371                                      struct uploaded_tp *utp);
 372
 373 extern void parse_tracepoint_definition (const char *line,
 374                                          struct uploaded_tp **utpp);
 375 extern void parse_tsv_definition (const char *line, struct uploaded_tsv **utsvp);
 376
 377 extern struct uploaded_tp *get_uploaded_tp (int num, ULONGEST addr,
 378                                             struct uploaded_tp **utpp);
 379 extern void free_uploaded_tps (struct uploaded_tp **utpp);
 380
 381 extern struct uploaded_tsv *get_uploaded_tsv (int num,
 382                                               struct uploaded_tsv **utsvp);
 383 extern void free_uploaded_tsvs (struct uploaded_tsv **utsvp);
 384 extern struct tracepoint *create_tracepoint_from_upload (struct uploaded_tp *utp);
 385 extern void merge_uploaded_tracepoints (struct uploaded_tp **utpp);
 386 extern void merge_uploaded_trace_state_variables (struct uploaded_tsv **utsvp);
 387
 388 extern void query_if_trace_running (int from_tty);
 389 extern void disconnect_tracing (void);
 390 extern void trace_reset_local_state (void);
 391
 392 extern void check_trace_running (struct trace_status *);
 393
 394 extern void start_tracing (const char *notes);
 395 extern void stop_tracing (const char *notes);
 396
 397 extern void trace_status_mi (int on_stop);
 398
 399 extern void tvariables_info_1 (void);
 400 extern void save_trace_state_variables (struct ui_file *fp);
 401
 402 /* Enumeration of the kinds of traceframe searches that a target may
 403    be able to perform.  */
 404
 405 enum trace_find_type
 406 {
 407   tfind_number,
 408   tfind_pc,
 409   tfind_tp,
 410   tfind_range,
 411   tfind_outside,
 412 };
 413
 414 extern void tfind_1 (enum trace_find_type type, int num,
 415                      CORE_ADDR addr1, CORE_ADDR addr2,
 416                      int from_tty);
 417
 418 extern void trace_save_tfile (const char *filename,
 419                               int target_does_save);
 420 extern void trace_save_ctf (const char *dirname,
 421                             int target_does_save);
 422
 423 extern traceframe_info_up parse_traceframe_info (const char *tframe_info);
 424
 425 extern int traceframe_available_memory (std::vector<mem_range> *result,
 426                                         CORE_ADDR memaddr, ULONGEST len);
 427
 428 extern struct traceframe_info *get_traceframe_info (void);
 429
 430 extern struct bp_location *get_traceframe_location (int *stepping_frame_p);
 431
 432 /* Command element for the 'while-stepping' command.  */
 433 extern cmd_list_element *while_stepping_cmd_element;
 434
 435 #endif  /* TRACEPOINT_H */