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305 lines
11 KiB
C
305 lines
11 KiB
C
/* Generic SDT probe support for GDB.
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Copyright (C) 2012-2017 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#if !defined (PROBE_H)
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#define PROBE_H 1
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struct event_location;
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#include "gdb_vecs.h"
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/* Definition of a vector of probes. */
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typedef struct probe *probe_p;
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DEF_VEC_P (probe_p);
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struct linespec_result;
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/* Structure useful for passing the header names in the method
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`gen_ui_out_table_header'. */
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struct info_probe_column
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{
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/* The internal name of the field. This string cannot be capitalized nor
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localized, e.g., "extra_field". */
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const char *field_name;
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/* The field name to be printed in the `info probes' command. This
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string can be capitalized and localized, e.g., _("Extra Field"). */
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const char *print_name;
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};
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typedef struct info_probe_column info_probe_column_s;
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DEF_VEC_O (info_probe_column_s);
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/* Operations associated with a probe. */
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struct probe_ops
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{
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/* Method responsible for verifying if LINESPECP is a valid linespec for
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a probe breakpoint. It should return 1 if it is, or zero if it is not.
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It also should update LINESPECP in order to discard the breakpoint
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option associated with this linespec. For example, if the option is
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`-probe', and the LINESPECP is `-probe abc', the function should
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return 1 and set LINESPECP to `abc'. */
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int (*is_linespec) (const char **linespecp);
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/* Function that should fill PROBES with known probes from OBJFILE. */
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void (*get_probes) (VEC (probe_p) **probes, struct objfile *objfile);
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/* Compute the probe's relocated address. OBJFILE is the objfile
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in which the probe originated. */
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CORE_ADDR (*get_probe_address) (struct probe *probe,
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struct objfile *objfile);
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/* Return the number of arguments of PROBE. This function can
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throw an exception. */
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unsigned (*get_probe_argument_count) (struct probe *probe,
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struct frame_info *frame);
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/* Return 1 if the probe interface can evaluate the arguments of probe
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PROBE, zero otherwise. See the comments on
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sym_probe_fns:can_evaluate_probe_arguments for more details. */
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int (*can_evaluate_probe_arguments) (struct probe *probe);
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/* Evaluate the Nth argument from the PROBE, returning a value
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corresponding to it. The argument number is represented N.
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This function can throw an exception. */
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struct value *(*evaluate_probe_argument) (struct probe *probe,
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unsigned n,
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struct frame_info *frame);
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/* Compile the Nth argument of the PROBE to an agent expression.
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The argument number is represented by N. */
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void (*compile_to_ax) (struct probe *probe, struct agent_expr *aexpr,
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struct axs_value *axs_value, unsigned n);
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/* Set the semaphore associated with the PROBE. This function only makes
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sense if the probe has a concept of semaphore associated to a
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probe, otherwise it can be set to NULL. */
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void (*set_semaphore) (struct probe *probe, struct objfile *objfile,
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struct gdbarch *gdbarch);
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/* Clear the semaphore associated with the PROBE. This function only
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makes sense if the probe has a concept of semaphore associated to
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a probe, otherwise it can be set to NULL. */
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void (*clear_semaphore) (struct probe *probe, struct objfile *objfile,
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struct gdbarch *gdbarch);
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/* Function called to destroy PROBE's specific data. This function
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shall not free PROBE itself. */
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void (*destroy) (struct probe *probe);
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/* Return a pointer to a name identifying the probe type. This is
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the string that will be displayed in the "Type" column of the
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`info probes' command. */
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const char *(*type_name) (struct probe *probe);
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/* Function responsible for providing the extra fields that will be
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printed in the `info probes' command. It should fill HEADS
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with whatever extra fields it needs. If the backend doesn't need
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to print extra fields, it can set this method to NULL. */
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void (*gen_info_probes_table_header) (VEC (info_probe_column_s) **heads);
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/* Function that will fill VALUES with the values of the extra fields
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to be printed for PROBE. If the backend implements the
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`gen_ui_out_table_header' method, then it should implement
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this method as well. The backend should also guarantee that the
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order and the number of values in the vector is exactly the same
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as the order of the extra fields provided in the method
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`gen_ui_out_table_header'. If a certain field is to be skipped
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when printing the information, you can push a NULL value in that
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position in the vector. */
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void (*gen_info_probes_table_values) (struct probe *probe,
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VEC (const_char_ptr) **values);
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/* Enable a probe. The semantics of "enabling" a probe depend on
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the specific backend and the field can be NULL in case enabling
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probes is not supported. This function can throw an
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exception. */
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void (*enable_probe) (struct probe *probe);
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/* Disable a probe. The semantics of "disabling" a probe depend
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on the specific backend and the field can be NULL in case
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disabling probes is not supported. This function can throw an
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exception. */
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void (*disable_probe) (struct probe *probe);
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};
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/* Definition of a vector of probe_ops. */
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typedef const struct probe_ops *probe_ops_cp;
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DEF_VEC_P (probe_ops_cp);
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extern VEC (probe_ops_cp) *all_probe_ops;
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/* The probe_ops associated with the generic probe. */
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extern const struct probe_ops probe_ops_any;
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/* Helper function that, given KEYWORDS, iterate over it trying to match
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each keyword with LINESPECP. If it succeeds, it updates the LINESPECP
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pointer and returns 1. Otherwise, nothing is done to LINESPECP and zero
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is returned. */
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extern int probe_is_linespec_by_keyword (const char **linespecp,
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const char *const *keywords);
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/* Return specific PROBE_OPS * matching *LINESPECP and possibly updating
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*LINESPECP to skip its "-probe-type " prefix. Return &probe_ops_any if
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*LINESPECP matches "-probe ", that is any unspecific probe. Return NULL if
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*LINESPECP is not identified as any known probe type, *LINESPECP is not
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modified in such case. */
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extern const struct probe_ops *probe_linespec_to_ops (const char **linespecp);
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/* The probe itself. The struct contains generic information about the
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probe, and then some specific information which should be stored in
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the `probe_info' field. */
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struct probe
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{
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/* The operations associated with this probe. */
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const struct probe_ops *pops;
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/* The probe's architecture. */
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struct gdbarch *arch;
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/* The name of the probe. */
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const char *name;
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/* The provider of the probe. It generally defaults to the name of
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the objfile which contains the probe. */
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const char *provider;
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/* The address where the probe is inserted, relative to
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SECT_OFF_TEXT. */
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CORE_ADDR address;
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};
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/* A bound probe holds a pointer to a probe and a pointer to the
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probe's defining objfile. This is needed because probes are
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independent of the program space and thus require relocation at
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their point of use. */
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struct bound_probe
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{
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/* The probe. */
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struct probe *probe;
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/* The objfile in which the probe originated. */
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struct objfile *objfile;
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};
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/* A helper for linespec that decodes a probe specification. It returns a
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symtabs_and_lines object and updates LOC or throws an error. */
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extern struct symtabs_and_lines parse_probes (const struct event_location *loc,
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struct program_space *pspace,
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struct linespec_result *canon);
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/* Helper function to register the proper probe_ops to a newly created probe.
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This function is mainly called from `sym_get_probes'. */
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extern void register_probe_ops (struct probe *probe);
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/* Given a PC, find an associated probe. If a probe is found, return
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it. If no probe is found, return a bound probe whose fields are
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both NULL. */
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extern struct bound_probe find_probe_by_pc (CORE_ADDR pc);
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/* Search OBJFILE for a probe with the given PROVIDER, NAME. Return a
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VEC of all probes that were found. If no matching probe is found,
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return NULL. The caller must free the VEC. */
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extern VEC (probe_p) *find_probes_in_objfile (struct objfile *objfile,
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const char *provider,
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const char *name);
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/* Generate a `info probes' command output for probe_ops represented by
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POPS. If POPS is NULL it considers any probes types. It is a helper
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function that can be used by the probe backends to print their
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`info probe TYPE'. */
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extern void info_probes_for_ops (const char *arg, int from_tty,
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const struct probe_ops *pops);
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/* Return the `cmd_list_element' associated with the `info probes' command,
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or create a new one if it doesn't exist. Helper function that serves the
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purpose of avoiding the case of a backend using the `cmd_list_element'
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associated with `info probes', without having it registered yet. */
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extern struct cmd_list_element **info_probes_cmdlist_get (void);
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/* Compute the probe's relocated address. OBJFILE is the objfile in
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which the probe originated. */
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extern CORE_ADDR get_probe_address (struct probe *probe,
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struct objfile *objfile);
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/* Return the argument count of the specified probe.
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This function can throw an exception. */
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extern unsigned get_probe_argument_count (struct probe *probe,
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struct frame_info *frame);
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/* Return 1 if the probe interface associated with PROBE can evaluate
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arguments, zero otherwise. See the comments on the definition of
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sym_probe_fns:can_evaluate_probe_arguments for more details. */
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extern int can_evaluate_probe_arguments (struct probe *probe);
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/* Evaluate argument N of the specified probe. N must be between 0
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inclusive and get_probe_argument_count exclusive.
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This function can throw an exception. */
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extern struct value *evaluate_probe_argument (struct probe *probe,
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unsigned n,
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struct frame_info *frame);
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/* A convenience function that finds a probe at the PC in FRAME and
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evaluates argument N, with 0 <= N < number_of_args. If there is no
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probe at that location, or if the probe does not have enough arguments,
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this returns NULL. */
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extern struct value *probe_safe_evaluate_at_pc (struct frame_info *frame,
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unsigned n);
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#endif /* !defined (PROBE_H) */
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