292 lines
9.2 KiB
C++
292 lines
9.2 KiB
C++
/* Data structures and API for event locations in GDB.
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Copyright (C) 2013-2020 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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#ifndef LOCATION_H
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#define LOCATION_H
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#include "symtab.h"
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struct language_defn;
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struct event_location;
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/* An enumeration of possible signs for a line offset. */
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enum offset_relative_sign
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{
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/* No sign */
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LINE_OFFSET_NONE,
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/* A plus sign ("+") */
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LINE_OFFSET_PLUS,
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/* A minus sign ("-") */
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LINE_OFFSET_MINUS,
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/* A special "sign" for unspecified offset. */
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LINE_OFFSET_UNKNOWN
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};
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/* A line offset in a location. */
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struct line_offset
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{
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/* Line offset and any specified sign. */
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int offset;
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enum offset_relative_sign sign;
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};
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/* An enumeration of the various ways to specify a stop event
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location (used with create_breakpoint). */
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enum event_location_type
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{
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/* A traditional linespec. */
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LINESPEC_LOCATION,
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/* An address in the inferior. */
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ADDRESS_LOCATION,
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/* An explicit location. */
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EXPLICIT_LOCATION,
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/* A probe location. */
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PROBE_LOCATION
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};
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/* A traditional linespec. */
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struct linespec_location
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{
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/* Whether the function name is fully-qualified or not. */
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symbol_name_match_type match_type;
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/* The linespec. */
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char *spec_string;
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};
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/* An explicit location. This structure is used to bypass the
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parsing done on linespecs. It still has the same requirements
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as linespecs, though. For example, source_filename requires
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at least one other field. */
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struct explicit_location
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{
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/* The source filename. Malloc'd. */
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char *source_filename;
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/* The function name. Malloc'd. */
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char *function_name;
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/* Whether the function name is fully-qualified or not. */
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symbol_name_match_type func_name_match_type;
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/* The name of a label. Malloc'd. */
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char *label_name;
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/* A line offset relative to the start of the symbol
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identified by the above fields or the current symtab
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if the other fields are NULL. */
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struct line_offset line_offset;
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};
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/* Return the type of the given event location. */
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extern enum event_location_type
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event_location_type (const struct event_location *);
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/* Return a malloc'd explicit string representation of the given
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explicit location. The location must already be canonicalized/valid. */
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extern char *
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explicit_location_to_string (const struct explicit_location *explicit_loc);
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/* Return a malloc'd linespec string representation of the given
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explicit location. The location must already be canonicalized/valid. */
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extern char *
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explicit_location_to_linespec (const struct explicit_location *explicit_loc);
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/* Return a string representation of the LOCATION.
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This function may return NULL for unspecified linespecs,
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e.g, LINESPEC_LOCATION and spec_string is NULL.
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The result is cached in LOCATION. */
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extern const char *
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event_location_to_string (struct event_location *location);
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/* A deleter for a struct event_location. */
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struct event_location_deleter
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{
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void operator() (event_location *location) const;
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};
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/* A unique pointer for event_location. */
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typedef std::unique_ptr<event_location, event_location_deleter>
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event_location_up;
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/* Create a new linespec location. */
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extern event_location_up new_linespec_location
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(const char **linespec, symbol_name_match_type match_type);
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/* Return the linespec location of the given event_location (which
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must be of type LINESPEC_LOCATION). */
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extern const linespec_location *
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get_linespec_location (const struct event_location *location);
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/* Create a new address location.
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ADDR is the address corresponding to this event_location.
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ADDR_STRING, a string of ADDR_STRING_LEN characters, is
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the expression that was parsed to determine the address ADDR. */
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extern event_location_up new_address_location (CORE_ADDR addr,
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const char *addr_string,
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int addr_string_len);
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/* Return the address location (a CORE_ADDR) of the given event_location
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(which must be of type ADDRESS_LOCATION). */
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extern CORE_ADDR
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get_address_location (const struct event_location *location);
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/* Return the expression (a string) that was used to compute the address
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of the given event_location (which must be of type ADDRESS_LOCATION). */
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extern const char *
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get_address_string_location (const struct event_location *location);
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/* Create a new probe location. */
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extern event_location_up new_probe_location (const char *probe);
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/* Return the probe location (a string) of the given event_location
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(which must be of type PROBE_LOCATION). */
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extern const char *
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get_probe_location (const struct event_location *location);
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/* Initialize the given explicit location. */
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extern void
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initialize_explicit_location (struct explicit_location *explicit_loc);
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/* Create a new explicit location. If not NULL, EXPLICIT is checked for
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validity. If invalid, an exception is thrown. */
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extern event_location_up
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new_explicit_location (const struct explicit_location *explicit_loc);
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/* Return the explicit location of the given event_location
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(which must be of type EXPLICIT_LOCATION). */
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extern struct explicit_location *
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get_explicit_location (struct event_location *location);
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/* A const version of the above. */
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extern const struct explicit_location *
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get_explicit_location_const (const struct event_location *location);
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/* Return a copy of the given SRC location. */
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extern event_location_up
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copy_event_location (const struct event_location *src);
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/* Attempt to convert the input string in *ARGP into an event_location.
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ARGP is advanced past any processed input. Returns an event_location
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(malloc'd) if an event location was successfully found in *ARGP,
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NULL otherwise.
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This function may call error() if *ARGP looks like properly formed,
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but invalid, input, e.g., if it is called with missing argument parameters
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or invalid options.
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This function is intended to be used by CLI commands and will parse
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explicit locations in a CLI-centric way. Other interfaces should use
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string_to_event_location_basic if they want to maintain support for
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legacy specifications of probe, address, and linespec locations.
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MATCH_TYPE should be either WILD or FULL. If -q/--qualified is specified
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in the input string, it will take precedence over this parameter. */
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extern event_location_up string_to_event_location
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(const char **argp, const struct language_defn *language,
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symbol_name_match_type match_type = symbol_name_match_type::WILD);
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/* Like string_to_event_location, but does not attempt to parse
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explicit locations. MATCH_TYPE indicates how function names should
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be matched. */
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extern event_location_up
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string_to_event_location_basic (const char **argp,
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const struct language_defn *language,
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symbol_name_match_type match_type);
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/* Structure filled in by string_to_explicit_location to aid the
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completer. */
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struct explicit_completion_info
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{
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/* Pointer to the last option found. E.g., in "b -sou src.c -fun
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func", LAST_OPTION is left pointing at "-fun func". */
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const char *last_option = NULL;
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/* These point to the start and end of a quoted argument, iff the
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last argument was quoted. If parsing finds an incomplete quoted
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string (e.g., "break -function 'fun"), then QUOTED_ARG_START is
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set to point to the opening \', and QUOTED_ARG_END is left NULL.
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If the last option is not quoted, then both are set to NULL. */
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const char *quoted_arg_start = NULL;
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const char *quoted_arg_end = NULL;
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/* True if we saw an explicit location option, as opposed to only
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flags that affect both explicit locations and linespecs, like
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"-qualified". */
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bool saw_explicit_location_option = false;
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};
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/* Attempt to convert the input string in *ARGP into an explicit location.
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ARGP is advanced past any processed input. Returns an event_location
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(malloc'd) if an explicit location was successfully found in *ARGP,
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NULL otherwise.
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If COMPLETION_INFO is NULL, this function may call error() if *ARGP
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looks like improperly formed input, e.g., if it is called with
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missing argument parameters or invalid options. If COMPLETION_INFO
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is not NULL, this function will not throw any exceptions. */
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extern event_location_up
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string_to_explicit_location (const char **argp,
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const struct language_defn *language,
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explicit_completion_info *completion_info);
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/* A convenience function for testing for unset locations. */
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extern int event_location_empty_p (const struct event_location *location);
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/* Set the location's string representation. If STRING is NULL, clear
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the string representation. */
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extern void
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set_event_location_string (struct event_location *location,
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const char *string);
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#endif /* LOCATION_H */
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