/* Data structures associated with breakpoints in GDB.
- Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
- 2002, 2003, 2004, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+ Copyright (C) 1992-2019 Free Software Foundation, Inc.
This file is part of GDB.
#include "frame.h"
#include "value.h"
-#include "vec.h"
+#include "ax.h"
+#include "command.h"
+#include "gdbsupport/break-common.h"
+#include "probe.h"
+#include "location.h"
+#include <vector>
+#include "gdbsupport/array-view.h"
+#include "gdbsupport/function-view.h"
+#include "cli/cli-script.h"
-struct value;
struct block;
+struct gdbpy_breakpoint_object;
+struct gdbscm_breakpoint_object;
+struct number_or_range_parser;
+struct thread_info;
+struct bpstats;
+struct bp_location;
+struct linespec_result;
+struct linespec_sals;
+struct inferior;
+
+/* Enum for exception-handling support in 'catch throw', 'catch rethrow',
+ 'catch catch' and the MI equivalent. */
+
+enum exception_event_kind
+{
+ EX_EVENT_THROW,
+ EX_EVENT_RETHROW,
+ EX_EVENT_CATCH
+};
+
+/* Why are we removing the breakpoint from the target? */
+
+enum remove_bp_reason
+{
+ /* A regular remove. Remove the breakpoint and forget everything
+ about it. */
+ REMOVE_BREAKPOINT,
+
+ /* Detach the breakpoints from a fork child. */
+ DETACH_BREAKPOINT,
+};
-/* This is the maximum number of bytes a breakpoint instruction can take.
- Feel free to increase it. It's just used in a few places to size
- arrays that should be independent of the target architecture. */
+/* This is the maximum number of bytes a breakpoint instruction can
+ take. Feel free to increase it. It's just used in a few places to
+ size arrays that should be independent of the target
+ architecture. */
#define BREAKPOINT_MAX 16
\f
/* Type of breakpoint. */
-/* FIXME In the future, we should fold all other breakpoint-like things into
- here. This includes:
-
- * single-step (for machines where we have to simulate single stepping)
- (probably, though perhaps it is better for it to look as much as
- possible like a single-step to wait_for_inferior). */
enum bptype
{
- bp_none = 0, /* Eventpoint has been deleted. */
+ bp_none = 0, /* Eventpoint has been deleted */
bp_breakpoint, /* Normal breakpoint */
bp_hardware_breakpoint, /* Hardware assisted breakpoint */
+ bp_single_step, /* Software single-step */
bp_until, /* used by until command */
bp_finish, /* used by finish command */
bp_watchpoint, /* Watchpoint */
bp_longjmp, /* secret breakpoint to find longjmp() */
bp_longjmp_resume, /* secret breakpoint to escape longjmp() */
- /* Used by wait_for_inferior for stepping over subroutine calls, for
- stepping over signal handlers, and for skipping prologues. */
+ /* Breakpoint placed to the same location(s) like bp_longjmp but used to
+ protect against stale DUMMY_FRAME. Multiple bp_longjmp_call_dummy and
+ one bp_call_dummy are chained together by related_breakpoint for each
+ DUMMY_FRAME. */
+ bp_longjmp_call_dummy,
+
+ /* An internal breakpoint that is installed on the unwinder's
+ debug hook. */
+ bp_exception,
+ /* An internal breakpoint that is set at the point where an
+ exception will land. */
+ bp_exception_resume,
+
+ /* Used by wait_for_inferior for stepping over subroutine calls,
+ and for skipping prologues. */
bp_step_resume,
+ /* Used by wait_for_inferior for stepping over signal
+ handlers. */
+ bp_hp_step_resume,
+
/* Used to detect when a watchpoint expression has gone out of
scope. These breakpoints are usually not visible to the user.
3) It can never be disabled. */
bp_watchpoint_scope,
- /* The breakpoint at the end of a call dummy. */
- /* FIXME: What if the function we are calling longjmp()s out of the
- call, or the user gets out with the "return" command? We currently
- have no way of cleaning up the breakpoint in these (obscure) situations.
- (Probably can solve this by noticing longjmp, "return", etc., it's
- similar to noticing when a watchpoint on a local variable goes out
- of scope (with hardware support for watchpoints)). */
+ /* The breakpoint at the end of a call dummy. See bp_longjmp_call_dummy it
+ is chained with by related_breakpoint. */
bp_call_dummy,
+ /* A breakpoint set on std::terminate, that is used to catch
+ otherwise uncaught exceptions thrown during an inferior call. */
+ bp_std_terminate,
+
/* Some dynamic linkers (HP, maybe Solaris) can arrange for special
code in the inferior to run when significant events occur in the
dynamic linker (for example a library is loaded or unloaded).
bp_longjmp_master,
+ /* Master copies of std::terminate breakpoints. */
+ bp_std_terminate_master,
+
+ /* Like bp_longjmp_master, but for exceptions. */
+ bp_exception_master,
+
bp_catchpoint,
bp_tracepoint,
bp_fast_tracepoint,
+ bp_static_tracepoint,
+
+ /* A dynamic printf stops at the given location, does a formatted
+ print, then automatically continues. (Although this is sort of
+ like a macro packaging up standard breakpoint functionality,
+ GDB doesn't have a way to construct types of breakpoint from
+ elements of behavior.) */
+ bp_dprintf,
/* Event for JIT compiled code generation or deletion. */
bp_jit_event,
+
+ /* Breakpoint is placed at the STT_GNU_IFUNC resolver. When hit GDB
+ inserts new bp_gnu_ifunc_resolver_return at the caller.
+ bp_gnu_ifunc_resolver is still being kept here as a different thread
+ may still hit it before bp_gnu_ifunc_resolver_return is hit by the
+ original thread. */
+ bp_gnu_ifunc_resolver,
+
+ /* On its hit GDB now know the resolved address of the target
+ STT_GNU_IFUNC function. Associated bp_gnu_ifunc_resolver can be
+ deleted now and the breakpoint moved to the target function entry
+ point. */
+ bp_gnu_ifunc_resolver_return,
};
-/* States of enablement of breakpoint. */
+/* States of enablement of breakpoint. */
enum enable_state
{
- bp_disabled, /* The eventpoint is inactive, and cannot trigger. */
- bp_enabled, /* The eventpoint is active, and can trigger. */
- bp_call_disabled, /* The eventpoint has been disabled while a call
- into the inferior is "in flight", because some
- eventpoints interfere with the implementation of
- a call on some targets. The eventpoint will be
- automatically enabled and reset when the call
- "lands" (either completes, or stops at another
- eventpoint). */
- bp_startup_disabled,/* The eventpoint has been disabled during inferior
- startup. This is necessary on some targets where
- the main executable will get relocated during
- startup, making breakpoint addresses invalid.
- The eventpoint will be automatically enabled and
- reset once inferior startup is complete. */
- bp_permanent /* There is a breakpoint instruction hard-wired into
- the target's code. Don't try to write another
- breakpoint instruction on top of it, or restore
- its value. Step over it using the architecture's
- SKIP_INSN macro. */
+ bp_disabled, /* The eventpoint is inactive, and cannot
+ trigger. */
+ bp_enabled, /* The eventpoint is active, and can
+ trigger. */
+ bp_call_disabled, /* The eventpoint has been disabled while a
+ call into the inferior is "in flight",
+ because some eventpoints interfere with
+ the implementation of a call on some
+ targets. The eventpoint will be
+ automatically enabled and reset when the
+ call "lands" (either completes, or stops
+ at another eventpoint). */
};
-/* Disposition of breakpoint. Ie: what to do after hitting it. */
+/* Disposition of breakpoint. Ie: what to do after hitting it. */
enum bpdisp
{
disp_del, /* Delete it */
- disp_del_at_next_stop, /* Delete at next stop, whether hit or not */
+ disp_del_at_next_stop, /* Delete at next stop,
+ whether hit or not */
disp_disable, /* Disable it */
disp_donttouch /* Leave it alone */
};
-enum target_hw_bp_type
+/* Status of breakpoint conditions used when synchronizing
+ conditions with the target. */
+
+enum condition_status
{
- hw_write = 0, /* Common HW watchpoint */
- hw_read = 1, /* Read HW watchpoint */
- hw_access = 2, /* Access HW watchpoint */
- hw_execute = 3 /* Execute HW breakpoint */
+ condition_unchanged = 0,
+ condition_modified,
+ condition_updated
};
-
/* Information used by targets to insert and remove breakpoints. */
struct bp_target_info
/* Address space at which the breakpoint was placed. */
struct address_space *placed_address_space;
- /* Address at which the breakpoint was placed. This is normally the
- same as ADDRESS from the bp_location, except when adjustment
- happens in gdbarch_breakpoint_from_pc. The most common form of
- adjustment is stripping an alternate ISA marker from the PC which
- is used to determine the type of breakpoint to insert. */
+ /* Address at which the breakpoint was placed. This is normally
+ the same as REQUESTED_ADDRESS, except when adjustment happens in
+ gdbarch_breakpoint_from_pc. The most common form of adjustment
+ is stripping an alternate ISA marker from the PC which is used
+ to determine the type of breakpoint to insert. */
CORE_ADDR placed_address;
+ /* Address at which the breakpoint was requested. */
+ CORE_ADDR reqstd_address;
+
+ /* If this is a ranged breakpoint, then this field contains the
+ length of the range that will be watched for execution. */
+ int length;
+
/* If the breakpoint lives in memory and reading that memory would
give back the breakpoint, instead of the original contents, then
the original contents are cached here. Only SHADOW_LEN bytes of
/* The length of the data cached in SHADOW_CONTENTS. */
int shadow_len;
- /* The size of the placed breakpoint, according to
- gdbarch_breakpoint_from_pc, when the breakpoint was inserted. This is
- generally the same as SHADOW_LEN, unless we did not need
- to read from the target to implement the memory breakpoint
- (e.g. if a remote stub handled the details). We may still
- need the size to remove the breakpoint safely. */
- int placed_size;
+ /* The breakpoint's kind. It is used in 'kind' parameter in Z
+ packets. */
+ int kind;
+
+ /* Conditions the target should evaluate if it supports target-side
+ breakpoint conditions. These are non-owning pointers. */
+ std::vector<agent_expr *> conditions;
+
+ /* Commands the target should evaluate if it supports target-side
+ breakpoint commands. These are non-owning pointers. */
+ std::vector<agent_expr *> tcommands;
+
+ /* Flag that is true if the breakpoint should be left in place even
+ when GDB is not connected. */
+ int persist;
};
/* GDB maintains two types of information about each breakpoint (or
bp_loc_other /* Miscellaneous... */
};
-struct bp_location
+class bp_location
{
+public:
+ bp_location () = default;
+
+ /* Construct a bp_location with the type inferred from OWNER's
+ type. */
+ explicit bp_location (breakpoint *owner);
+
+ /* Construct a bp_location with type TYPE. */
+ bp_location (breakpoint *owner, bp_loc_type type);
+
+ virtual ~bp_location ();
+
/* Chain pointer to the next breakpoint location for
the same parent breakpoint. */
- struct bp_location *next;
+ bp_location *next = NULL;
+
+ /* The reference count. */
+ int refc = 0;
/* Type of this breakpoint location. */
- enum bp_loc_type loc_type;
+ bp_loc_type loc_type {};
/* Each breakpoint location must belong to exactly one higher-level
- breakpoint. This and the DUPLICATE flag are more straightforward
- than reference counting. */
- struct breakpoint *owner;
+ breakpoint. This pointer is NULL iff this bp_location is no
+ longer attached to a breakpoint. For example, when a breakpoint
+ is deleted, its locations may still be found in the
+ moribund_locations list, or if we had stopped for it, in
+ bpstats. */
+ breakpoint *owner = NULL;
/* Conditional. Break only if this expression's value is nonzero.
Unlike string form of condition, which is associated with
different for different locations. Only valid for real
breakpoints; a watchpoint's conditional expression is stored in
the owner breakpoint object. */
- struct expression *cond;
+ expression_up cond;
+
+ /* Conditional expression in agent expression
+ bytecode form. This is used for stub-side breakpoint
+ condition evaluation. */
+ agent_expr_up cond_bytecode;
+
+ /* Signals that the condition has changed since the last time
+ we updated the global location list. This means the condition
+ needs to be sent to the target again. This is used together
+ with target-side breakpoint conditions.
+
+ condition_unchanged: It means there has been no condition changes.
+
+ condition_modified: It means this location had its condition modified.
+
+ condition_updated: It means we already marked all the locations that are
+ duplicates of this location and thus we don't need to call
+ force_breakpoint_reinsertion (...) for this location. */
+
+ condition_status condition_changed {};
+
+ agent_expr_up cmd_bytecode;
+
+ /* Signals that breakpoint conditions and/or commands need to be
+ re-synced with the target. This has no use other than
+ target-side breakpoints. */
+ bool needs_update = false;
/* This location's address is in an unloaded solib, and so this
location should not be inserted. It will be automatically
enabled when that solib is loaded. */
- char shlib_disabled;
+ bool shlib_disabled = false;
/* Is this particular location enabled. */
- char enabled;
+ bool enabled = false;
- /* Nonzero if this breakpoint is now inserted. */
- char inserted;
-
- /* Nonzero if this is not the first breakpoint in the list
- for the given address. */
- char duplicate;
+ /* True if this breakpoint is now inserted. */
+ bool inserted = false;
+
+ /* True if this is a permanent breakpoint. There is a breakpoint
+ instruction hard-wired into the target's code. Don't try to
+ write another breakpoint instruction on top of it, or restore its
+ value. Step over it using the architecture's
+ gdbarch_skip_permanent_breakpoint method. */
+ bool permanent = false;
+
+ /* True if this is not the first breakpoint in the list
+ for the given address. location of tracepoint can _never_
+ be duplicated with other locations of tracepoints and other
+ kinds of breakpoints, because two locations at the same
+ address may have different actions, so both of these locations
+ should be downloaded and so that `tfind N' always works. */
+ bool duplicate = false;
/* If we someday support real thread-specific breakpoints, then
the breakpoint location will need a thread identifier. */
/* Architecture associated with this location's address. May be
different from the breakpoint architecture. */
- struct gdbarch *gdbarch;
+ struct gdbarch *gdbarch = NULL;
/* The program space associated with this breakpoint location
address. Note that an address space may be represented in more
its own program space, but there will only be one address space
for all of them), but we must not insert more than one location
at the same address in the same address space. */
- struct program_space *pspace;
+ program_space *pspace = NULL;
/* Note that zero is a perfectly valid code address on some platforms
(for example, the mn10200 (OBSOLETE) and mn10300 simulators). NULL
is not a special value for this field. Valid for all types except
bp_loc_other. */
- CORE_ADDR address;
+ CORE_ADDR address = 0;
- /* For hardware watchpoints, the size of data ad ADDRESS being watches. */
- int length;
+ /* For hardware watchpoints, the size of the memory region being
+ watched. For hardware ranged breakpoints, the size of the
+ breakpoint range. */
+ int length = 0;
- /* Type of hardware watchpoint. */
- enum target_hw_bp_type watchpoint_type;
+ /* Type of hardware watchpoint. */
+ target_hw_bp_type watchpoint_type {};
/* For any breakpoint type with an address, this is the section
- associated with the address. Used primarily for overlay debugging. */
- struct obj_section *section;
+ associated with the address. Used primarily for overlay
+ debugging. */
+ obj_section *section = NULL;
/* Address at which breakpoint was requested, either by the user or
by GDB for internal breakpoints. This will usually be the same
ADJUST_BREAKPOINT_ADDRESS has computed a different address at
which to place the breakpoint in order to comply with a
processor's architectual constraints. */
- CORE_ADDR requested_address;
+ CORE_ADDR requested_address = 0;
+
+ /* An additional address assigned with this location. This is currently
+ only used by STT_GNU_IFUNC resolver breakpoints to hold the address
+ of the resolver function. */
+ CORE_ADDR related_address = 0;
- char *function_name;
+ /* If the location comes from a probe point, this is the probe associated
+ with it. */
+ bound_probe probe {};
+
+ char *function_name = NULL;
/* Details of the placed breakpoint, when inserted. */
- struct bp_target_info target_info;
+ bp_target_info target_info {};
/* Similarly, for the breakpoint at an overlay's LMA, if necessary. */
- struct bp_target_info overlay_target_info;
+ bp_target_info overlay_target_info {};
/* In a non-stop mode, it's possible that we delete a breakpoint,
but as we do that, some still running thread hits that breakpoint.
breakpoint was deleted, we retire all locations of that breakpoint.
This variable keeps a number of events still to go, when
it becomes 0 this location is retired. */
- int events_till_retirement;
+ int events_till_retirement = 0;
+
+ /* Line number which was used to place this location.
+
+ Breakpoint placed into a comment keeps it's user specified line number
+ despite ADDRESS resolves into a different line number. */
+
+ int line_number = 0;
+
+ /* Symtab which was used to place this location. This is used
+ to find the corresponding source file name. */
+
+ struct symtab *symtab = NULL;
+
+ /* The symbol found by the location parser, if any. This may be used to
+ ascertain when an event location was set at a different location than
+ the one originally selected by parsing, e.g., inlined symbols. */
+ const struct symbol *symbol = NULL;
+
+ /* Similarly, the minimal symbol found by the location parser, if
+ any. This may be used to ascertain if the location was
+ originally set on a GNU ifunc symbol. */
+ const minimal_symbol *msymbol = NULL;
+
+ /* The objfile the symbol or minimal symbol were found in. */
+ const struct objfile *objfile = NULL;
+};
+
+/* The possible return values for print_bpstat, print_it_normal,
+ print_it_done, print_it_noop. */
+enum print_stop_action
+{
+ /* We printed nothing or we need to do some more analysis. */
+ PRINT_UNKNOWN = -1,
+
+ /* We printed something, and we *do* desire that something to be
+ followed by a location. */
+ PRINT_SRC_AND_LOC,
+
+ /* We printed something, and we do *not* desire that something to be
+ followed by a location. */
+ PRINT_SRC_ONLY,
+
+ /* We already printed all we needed to print, don't print anything
+ else. */
+ PRINT_NOTHING
};
/* This structure is a collection of function pointers that, if available,
will be called instead of the performing the default action for this
bptype. */
-struct breakpoint_ops
+struct breakpoint_ops
{
- /* Insert the breakpoint or activate the catchpoint. Should raise
- an exception if the operation failed. */
- void (*insert) (struct breakpoint *);
+ /* Allocate a location for this breakpoint. */
+ struct bp_location * (*allocate_location) (struct breakpoint *);
- /* Remove the breakpoint/catchpoint that was previously inserted
- with the "insert" method above. Return non-zero if the operation
- succeeded. */
- int (*remove) (struct breakpoint *);
+ /* Reevaluate a breakpoint. This is necessary after symbols change
+ (e.g., an executable or DSO was loaded, or the inferior just
+ started). */
+ void (*re_set) (struct breakpoint *self);
+
+ /* Insert the breakpoint or watchpoint or activate the catchpoint.
+ Return 0 for success, 1 if the breakpoint, watchpoint or
+ catchpoint type is not supported, -1 for failure. */
+ int (*insert_location) (struct bp_location *);
- /* Return non-zero if the debugger should tell the user that this
- breakpoint was hit. */
- int (*breakpoint_hit) (struct breakpoint *);
+ /* Remove the breakpoint/catchpoint that was previously inserted
+ with the "insert" method above. Return 0 for success, 1 if the
+ breakpoint, watchpoint or catchpoint type is not supported,
+ -1 for failure. */
+ int (*remove_location) (struct bp_location *, enum remove_bp_reason reason);
+
+ /* Return true if it the target has stopped due to hitting
+ breakpoint location BL. This function does not check if we
+ should stop, only if BL explains the stop. ASPACE is the address
+ space in which the event occurred, BP_ADDR is the address at
+ which the inferior stopped, and WS is the target_waitstatus
+ describing the event. */
+ int (*breakpoint_hit) (const struct bp_location *bl,
+ const address_space *aspace,
+ CORE_ADDR bp_addr,
+ const struct target_waitstatus *ws);
+
+ /* Check internal conditions of the breakpoint referred to by BS.
+ If we should not stop for this breakpoint, set BS->stop to 0. */
+ void (*check_status) (struct bpstats *bs);
+
+ /* Tell how many hardware resources (debug registers) are needed
+ for this breakpoint. If this function is not provided, then
+ the breakpoint or watchpoint needs one debug register. */
+ int (*resources_needed) (const struct bp_location *);
+
+ /* Tell whether we can downgrade from a hardware watchpoint to a software
+ one. If not, the user will not be able to enable the watchpoint when
+ there are not enough hardware resources available. */
+ int (*works_in_software_mode) (const struct breakpoint *);
/* The normal print routine for this breakpoint, called when we
hit it. */
- enum print_stop_action (*print_it) (struct breakpoint *);
+ enum print_stop_action (*print_it) (struct bpstats *bs);
- /* Display information about this breakpoint, for "info breakpoints". */
+ /* Display information about this breakpoint, for "info
+ breakpoints". */
void (*print_one) (struct breakpoint *, struct bp_location **);
- /* Display information about this breakpoint after setting it (roughly
- speaking; this is called from "mention"). */
+ /* Display extra information about this breakpoint, below the normal
+ breakpoint description in "info breakpoints".
+
+ In the example below, the "address range" line was printed
+ by print_one_detail_ranged_breakpoint.
+
+ (gdb) info breakpoints
+ Num Type Disp Enb Address What
+ 2 hw breakpoint keep y in main at test-watch.c:70
+ address range: [0x10000458, 0x100004c7]
+
+ */
+ void (*print_one_detail) (const struct breakpoint *, struct ui_out *);
+
+ /* Display information about this breakpoint after setting it
+ (roughly speaking; this is called from "mention"). */
void (*print_mention) (struct breakpoint *);
+
+ /* Print to FP the CLI command that recreates this breakpoint. */
+ void (*print_recreate) (struct breakpoint *, struct ui_file *fp);
+
+ /* Create SALs from location, storing the result in linespec_result.
+
+ For an explanation about the arguments, see the function
+ `create_sals_from_location_default'.
+
+ This function is called inside `create_breakpoint'. */
+ void (*create_sals_from_location) (const struct event_location *location,
+ struct linespec_result *canonical,
+ enum bptype type_wanted);
+
+ /* This method will be responsible for creating a breakpoint given its SALs.
+ Usually, it just calls `create_breakpoints_sal' (for ordinary
+ breakpoints). However, there may be some special cases where we might
+ need to do some tweaks, e.g., see
+ `strace_marker_create_breakpoints_sal'.
+
+ This function is called inside `create_breakpoint'. */
+ void (*create_breakpoints_sal) (struct gdbarch *,
+ struct linespec_result *,
+ gdb::unique_xmalloc_ptr<char>,
+ gdb::unique_xmalloc_ptr<char>,
+ enum bptype, enum bpdisp, int, int,
+ int, const struct breakpoint_ops *,
+ int, int, int, unsigned);
+
+ /* Given the location (second parameter), this method decodes it and
+ returns the SAL locations related to it. For ordinary
+ breakpoints, it calls `decode_line_full'. If SEARCH_PSPACE is
+ not NULL, symbol search is restricted to just that program space.
+
+ This function is called inside `location_to_sals'. */
+ std::vector<symtab_and_line> (*decode_location)
+ (struct breakpoint *b,
+ const struct event_location *location,
+ struct program_space *search_pspace);
+
+ /* Return true if this breakpoint explains a signal. See
+ bpstat_explains_signal. */
+ int (*explains_signal) (struct breakpoint *, enum gdb_signal);
+
+ /* Called after evaluating the breakpoint's condition,
+ and only if it evaluated true. */
+ void (*after_condition_true) (struct bpstats *bs);
};
+/* Helper for breakpoint_ops->print_recreate implementations. Prints
+ the "thread" or "task" condition of B, and then a newline.
+
+ Necessary because most breakpoint implementations accept
+ thread/task conditions at the end of the spec line, like "break foo
+ thread 1", which needs outputting before any breakpoint-type
+ specific extra command necessary for B's recreation. */
+extern void print_recreate_thread (struct breakpoint *b, struct ui_file *fp);
+
enum watchpoint_triggered
{
/* This watchpoint definitely did not trigger. */
watch_triggered_yes
};
-/* This is used to declare the VEC syscalls_to_be_caught. */
-DEF_VEC_I(int);
-
-typedef struct bp_location *bp_location_p;
-DEF_VEC_P(bp_location_p);
-
-/* A reference-counted struct command_line. This lets multiple
- breakpoints share a single command list. */
-struct counted_command_line
-{
- /* The reference count. */
- int refc;
+/* Some targets (e.g., embedded PowerPC) need two debug registers to set
+ a watchpoint over a memory region. If this flag is true, GDB will use
+ only one register per watchpoint, thus assuming that all accesses that
+ modify a memory location happen at its starting address. */
- /* The command list. */
- struct command_line *commands;
-};
+extern bool target_exact_watchpoints;
/* Note that the ->silent field is not currently used by any commands
(though the code is in there if it was to be, and set_raw_breakpoint
useful for a hack I had to put in; I'm going to leave it in because
I can see how there might be times when it would indeed be useful */
-/* This is for a breakpoint or a watchpoint. */
+/* This is for all kinds of breakpoints. */
struct breakpoint
- {
- struct breakpoint *next;
- /* Type of breakpoint. */
- enum bptype type;
- /* Zero means disabled; remember the info but don't break here. */
- enum enable_state enable_state;
- /* What to do with this breakpoint after we hit it. */
- enum bpdisp disposition;
- /* Number assigned to distinguish breakpoints. */
- int number;
-
- /* Location(s) associated with this high-level breakpoint. */
- struct bp_location *loc;
-
- /* Line number of this address. */
-
- int line_number;
-
- /* Source file name of this address. */
-
- char *source_file;
-
- /* Non-zero means a silent breakpoint (don't print frame info
- if we stop here). */
- unsigned char silent;
- /* Number of stops at this breakpoint that should
- be continued automatically before really stopping. */
- int ignore_count;
- /* Chain of command lines to execute when this breakpoint is hit. */
- struct counted_command_line *commands;
- /* Stack depth (address of frame). If nonzero, break only if fp
- equals this. */
- struct frame_id frame_id;
-
- /* The program space used to set the breakpoint. */
- struct program_space *pspace;
-
- /* String we used to set the breakpoint (malloc'd). */
- char *addr_string;
- /* Architecture we used to set the breakpoint. */
- struct gdbarch *gdbarch;
- /* Language we used to set the breakpoint. */
- enum language language;
- /* Input radix we used to set the breakpoint. */
- int input_radix;
- /* String form of the breakpoint condition (malloc'd), or NULL if there
- is no condition. */
- char *cond_string;
- /* String form of exp (malloc'd), or NULL if none. */
- char *exp_string;
-
- /* The expression we are watching, or NULL if not a watchpoint. */
- struct expression *exp;
- /* The largest block within which it is valid, or NULL if it is
- valid anywhere (e.g. consists just of global symbols). */
- struct block *exp_valid_block;
- /* The conditional expression if any. NULL if not a watchpoint. */
- struct expression *cond_exp;
- /* The largest block within which it is valid, or NULL if it is
- valid anywhere (e.g. consists just of global symbols). */
- struct block *cond_exp_valid_block;
- /* Value of the watchpoint the last time we checked it, or NULL
- when we do not know the value yet or the value was not
- readable. VAL is never lazy. */
- struct value *val;
- /* Nonzero if VAL is valid. If VAL_VALID is set but VAL is NULL,
- then an error occurred reading the value. */
- int val_valid;
-
- /* Holds the address of the related watchpoint_scope breakpoint
- when using watchpoints on local variables (might the concept
- of a related breakpoint be useful elsewhere, if not just call
- it the watchpoint_scope breakpoint or something like that. FIXME). */
- struct breakpoint *related_breakpoint;
-
- /* Holds the frame address which identifies the frame this
- watchpoint should be evaluated in, or `null' if the watchpoint
- should be evaluated on the outermost frame. */
- struct frame_id watchpoint_frame;
-
- /* Holds the thread which identifies the frame this watchpoint
- should be considered in scope for, or `null_ptid' if the
- watchpoint should be evaluated in all threads. */
- ptid_t watchpoint_thread;
-
- /* For hardware watchpoints, the triggered status according to the
- hardware. */
- enum watchpoint_triggered watchpoint_triggered;
-
- /* Thread number for thread-specific breakpoint, or -1 if don't care. */
- int thread;
-
- /* Ada task number for task-specific breakpoint, or 0 if don't care. */
- int task;
-
- /* Count of the number of times this breakpoint was taken, dumped
- with the info, but not used for anything else. Useful for
- seeing how many times you hit a break prior to the program
- aborting, so you can back up to just before the abort. */
- int hit_count;
-
- /* Process id of a child process whose forking triggered this
- catchpoint. This field is only valid immediately after this
- catchpoint has triggered. */
- ptid_t forked_inferior_pid;
-
- /* Filename of a program whose exec triggered this catchpoint.
- This field is only valid immediately after this catchpoint has
- triggered. */
- char *exec_pathname;
-
- /* Syscall numbers used for the 'catch syscall' feature.
- If no syscall has been specified for filtering, its value is NULL.
- Otherwise, it holds a list of all syscalls to be caught.
- The list elements are allocated with xmalloc. */
- VEC(int) *syscalls_to_be_caught;
-
- /* Methods associated with this breakpoint. */
- struct breakpoint_ops *ops;
-
- /* Is breakpoint's condition not yet parsed because we found
- no location initially so had no context to parse
- the condition in. */
- int condition_not_parsed;
-
- /* Number of times this tracepoint should single-step
- and collect additional data. */
- long step_count;
-
- /* Number of times this tracepoint should be hit before
- disabling/ending. */
- int pass_count;
-
- /* The number of the tracepoint on the target. */
- int number_on_target;
- };
+{
+ virtual ~breakpoint ();
+
+ /* Methods associated with this breakpoint. */
+ const breakpoint_ops *ops = NULL;
+
+ breakpoint *next = NULL;
+ /* Type of breakpoint. */
+ bptype type = bp_none;
+ /* Zero means disabled; remember the info but don't break here. */
+ enum enable_state enable_state = bp_enabled;
+ /* What to do with this breakpoint after we hit it. */
+ bpdisp disposition = disp_del;
+ /* Number assigned to distinguish breakpoints. */
+ int number = 0;
+
+ /* Location(s) associated with this high-level breakpoint. */
+ bp_location *loc = NULL;
+
+ /* True means a silent breakpoint (don't print frame info if we stop
+ here). */
+ bool silent = false;
+ /* True means display ADDR_STRING to the user verbatim. */
+ bool display_canonical = false;
+ /* Number of stops at this breakpoint that should be continued
+ automatically before really stopping. */
+ int ignore_count = 0;
+
+ /* Number of stops at this breakpoint before it will be
+ disabled. */
+ int enable_count = 0;
+
+ /* Chain of command lines to execute when this breakpoint is
+ hit. */
+ counted_command_line commands;
+ /* Stack depth (address of frame). If nonzero, break only if fp
+ equals this. */
+ struct frame_id frame_id = null_frame_id;
+
+ /* The program space used to set the breakpoint. This is only set
+ for breakpoints which are specific to a program space; for
+ non-thread-specific ordinary breakpoints this is NULL. */
+ program_space *pspace = NULL;
+
+ /* Location we used to set the breakpoint. */
+ event_location_up location;
+
+ /* The filter that should be passed to decode_line_full when
+ re-setting this breakpoint. This may be NULL. */
+ gdb::unique_xmalloc_ptr<char> filter;
+
+ /* For a ranged breakpoint, the location we used to find the end of
+ the range. */
+ event_location_up location_range_end;
+
+ /* Architecture we used to set the breakpoint. */
+ struct gdbarch *gdbarch = NULL;
+ /* Language we used to set the breakpoint. */
+ enum language language = language_unknown;
+ /* Input radix we used to set the breakpoint. */
+ int input_radix = 0;
+ /* String form of the breakpoint condition (malloc'd), or NULL if
+ there is no condition. */
+ char *cond_string = NULL;
+
+ /* String form of extra parameters, or NULL if there are none.
+ Malloc'd. */
+ char *extra_string = NULL;
+
+ /* Holds the address of the related watchpoint_scope breakpoint when
+ using watchpoints on local variables (might the concept of a
+ related breakpoint be useful elsewhere, if not just call it the
+ watchpoint_scope breakpoint or something like that. FIXME). */
+ breakpoint *related_breakpoint = NULL;
+
+ /* Thread number for thread-specific breakpoint, or -1 if don't
+ care. */
+ int thread = -1;
+
+ /* Ada task number for task-specific breakpoint, or 0 if don't
+ care. */
+ int task = 0;
+
+ /* Count of the number of times this breakpoint was taken, dumped
+ with the info, but not used for anything else. Useful for seeing
+ how many times you hit a break prior to the program aborting, so
+ you can back up to just before the abort. */
+ int hit_count = 0;
+
+ /* Is breakpoint's condition not yet parsed because we found no
+ location initially so had no context to parse the condition
+ in. */
+ int condition_not_parsed = 0;
+
+ /* With a Python scripting enabled GDB, store a reference to the
+ Python object that has been associated with this breakpoint.
+ This is always NULL for a GDB that is not script enabled. It can
+ sometimes be NULL for enabled GDBs as not all breakpoint types
+ are tracked by the scripting language API. */
+ gdbpy_breakpoint_object *py_bp_object = NULL;
+
+ /* Same as py_bp_object, but for Scheme. */
+ gdbscm_breakpoint_object *scm_bp_object = NULL;
+};
+
+/* An instance of this type is used to represent a watchpoint. */
+
+struct watchpoint : public breakpoint
+{
+ ~watchpoint () override;
+
+ /* String form of exp to use for displaying to the user (malloc'd),
+ or NULL if none. */
+ char *exp_string;
+ /* String form to use for reparsing of EXP (malloc'd) or NULL. */
+ char *exp_string_reparse;
+
+ /* The expression we are watching, or NULL if not a watchpoint. */
+ expression_up exp;
+ /* The largest block within which it is valid, or NULL if it is
+ valid anywhere (e.g. consists just of global symbols). */
+ const struct block *exp_valid_block;
+ /* The conditional expression if any. */
+ expression_up cond_exp;
+ /* The largest block within which it is valid, or NULL if it is
+ valid anywhere (e.g. consists just of global symbols). */
+ const struct block *cond_exp_valid_block;
+ /* Value of the watchpoint the last time we checked it, or NULL when
+ we do not know the value yet or the value was not readable. VAL
+ is never lazy. */
+ value_ref_ptr val;
+
+ /* True if VAL is valid. If VAL_VALID is set but VAL is NULL,
+ then an error occurred reading the value. */
+ bool val_valid;
+
+ /* When watching the location of a bitfield, contains the offset and size of
+ the bitfield. Otherwise contains 0. */
+ int val_bitpos;
+ int val_bitsize;
+
+ /* Holds the frame address which identifies the frame this
+ watchpoint should be evaluated in, or `null' if the watchpoint
+ should be evaluated on the outermost frame. */
+ struct frame_id watchpoint_frame;
+
+ /* Holds the thread which identifies the frame this watchpoint
+ should be considered in scope for, or `null_ptid' if the
+ watchpoint should be evaluated in all threads. */
+ ptid_t watchpoint_thread;
+
+ /* For hardware watchpoints, the triggered status according to the
+ hardware. */
+ enum watchpoint_triggered watchpoint_triggered;
+
+ /* Whether this watchpoint is exact (see
+ target_exact_watchpoints). */
+ int exact;
+
+ /* The mask address for a masked hardware watchpoint. */
+ CORE_ADDR hw_wp_mask;
+};
+
+/* Given a function FUNC (struct breakpoint *B, void *DATA) and
+ USER_DATA, call FUNC for every known breakpoint passing USER_DATA
+ as argument.
+
+ If FUNC returns 1, the loop stops and the current
+ 'struct breakpoint' being processed is returned. If FUNC returns
+ zero, the loop continues.
+
+ This function returns either a 'struct breakpoint' pointer or NULL.
+ It was based on BFD's bfd_sections_find_if function. */
+
+extern struct breakpoint *breakpoint_find_if
+ (int (*func) (struct breakpoint *b, void *d), void *user_data);
+
+/* Return true if BPT is either a software breakpoint or a hardware
+ breakpoint. */
+
+extern bool is_breakpoint (const struct breakpoint *bpt);
+
+/* Return true if BPT is of any watchpoint kind, hardware or
+ software. */
+
+extern bool is_watchpoint (const struct breakpoint *bpt);
+
+/* Return true if BPT is a C++ exception catchpoint (catch
+ catch/throw/rethrow). */
+
+extern bool is_exception_catchpoint (breakpoint *bp);
+
+/* An instance of this type is used to represent all kinds of
+ tracepoints. */
+
+struct tracepoint : public breakpoint
+{
+ /* Number of times this tracepoint should single-step and collect
+ additional data. */
+ long step_count;
+
+ /* Number of times this tracepoint should be hit before
+ disabling/ending. */
+ int pass_count;
+
+ /* The number of the tracepoint on the target. */
+ int number_on_target;
+
+ /* The total space taken by all the trace frames for this
+ tracepoint. */
+ ULONGEST traceframe_usage;
+
+ /* The static tracepoint marker id, if known. */
+ std::string static_trace_marker_id;
+
+ /* LTTng/UST allow more than one marker with the same ID string,
+ although it unadvised because it confuses tools. When setting
+ static tracepoints by marker ID, this will record the index in
+ the array of markers we found for the given marker ID for which
+ this static tracepoint corresponds. When resetting breakpoints,
+ we will use this index to try to find the same marker again. */
+ int static_trace_marker_id_idx;
+};
-typedef struct breakpoint *breakpoint_p;
-DEF_VEC_P(breakpoint_p);
\f
/* The following stuff is an abstract data type "bpstat" ("breakpoint
status"). This provides the ability to determine whether we have
typedef struct bpstats *bpstat;
-/* Frees any storage that is part of a bpstat.
- Does not walk the 'next' chain. */
-extern void bpstat_free (bpstat);
-
/* Clears a chain of bpstat, freeing storage
of each. */
extern void bpstat_clear (bpstat *);
is part of the bpstat is copied as well. */
extern bpstat bpstat_copy (bpstat);
-extern bpstat bpstat_stop_status (struct address_space *aspace,
- CORE_ADDR pc, ptid_t ptid);
+/* Build the (raw) bpstat chain for the stop information given by ASPACE,
+ BP_ADDR, and WS. Returns the head of the bpstat chain. */
+
+extern bpstat build_bpstat_chain (const address_space *aspace,
+ CORE_ADDR bp_addr,
+ const struct target_waitstatus *ws);
+
+/* Get a bpstat associated with having just stopped at address
+ BP_ADDR in thread PTID. STOP_CHAIN may be supplied as a previously
+ computed stop chain or NULL, in which case the stop chain will be
+ computed using build_bpstat_chain.
+
+ Determine whether we stopped at a breakpoint, etc, or whether we
+ don't understand this stop. Result is a chain of bpstat's such
+ that:
+
+ if we don't understand the stop, the result is a null pointer.
+
+ if we understand why we stopped, the result is not null.
+
+ Each element of the chain refers to a particular breakpoint or
+ watchpoint at which we have stopped. (We may have stopped for
+ several reasons concurrently.)
+
+ Each element of the chain has valid next, breakpoint_at,
+ commands, FIXME??? fields. */
+
+extern bpstat bpstat_stop_status (const address_space *aspace,
+ CORE_ADDR pc, thread_info *thread,
+ const struct target_waitstatus *ws,
+ bpstat stop_chain = NULL);
\f
/* This bpstat_what stuff tells wait_for_inferior what to do with a
- breakpoint (a challenging task). */
+ breakpoint (a challenging task).
+
+ The enum values order defines priority-like order of the actions.
+ Once you've decided that some action is appropriate, you'll never
+ go back and decide something of a lower priority is better. Each
+ of these actions is mutually exclusive with the others. That
+ means, that if you find yourself adding a new action class here and
+ wanting to tell GDB that you have two simultaneous actions to
+ handle, something is wrong, and you probably don't actually need a
+ new action type.
+
+ Note that a step resume breakpoint overrides another breakpoint of
+ signal handling (see comment in wait_for_inferior at where we set
+ the step_resume breakpoint). */
enum bpstat_what_main_action
{
else). */
BPSTAT_WHAT_KEEP_CHECKING,
- /* Rather than distinguish between noisy and silent stops here, it
- might be cleaner to have bpstat_print make that decision (also
- taking into account stop_print_frame and source_only). But the
- implications are a bit scary (interaction with auto-displays, etc.),
- so I won't try it. */
-
- /* Stop silently. */
- BPSTAT_WHAT_STOP_SILENT,
-
- /* Stop and print. */
- BPSTAT_WHAT_STOP_NOISY,
-
/* Remove breakpoints, single step once, then put them back in and
- go back to what we were doing. It's possible that this should be
- removed from the main_action and put into a separate field, to more
- cleanly handle BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE. */
+ go back to what we were doing. It's possible that this should
+ be removed from the main_action and put into a separate field,
+ to more cleanly handle
+ BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE. */
BPSTAT_WHAT_SINGLE,
/* Set longjmp_resume breakpoint, remove all other breakpoints,
- and continue. The "remove all other breakpoints" part is required
- if we are also stepping over another breakpoint as well as doing
- the longjmp handling. */
+ and continue. The "remove all other breakpoints" part is
+ required if we are also stepping over another breakpoint as
+ well as doing the longjmp handling. */
BPSTAT_WHAT_SET_LONGJMP_RESUME,
/* Clear longjmp_resume breakpoint, then handle as
/* Clear step resume breakpoint, and keep checking. */
BPSTAT_WHAT_STEP_RESUME,
- /* Check the dynamic linker's data structures for new libraries, then
- keep checking. */
- BPSTAT_WHAT_CHECK_SHLIBS,
+ /* Rather than distinguish between noisy and silent stops here, it
+ might be cleaner to have bpstat_print make that decision (also
+ taking into account stop_print_frame and source_only). But the
+ implications are a bit scary (interaction with auto-displays,
+ etc.), so I won't try it. */
+
+ /* Stop silently. */
+ BPSTAT_WHAT_STOP_SILENT,
- /* Check for new JITed code. */
- BPSTAT_WHAT_CHECK_JIT,
+ /* Stop and print. */
+ BPSTAT_WHAT_STOP_NOISY,
- /* This is just used to keep track of how many enums there are. */
- BPSTAT_WHAT_LAST
+ /* Clear step resume breakpoint, and keep checking. High-priority
+ step-resume breakpoints are used when even if there's a user
+ breakpoint at the current PC when we set the step-resume
+ breakpoint, we don't want to re-handle any breakpoint other
+ than the step-resume when it's hit; instead we want to move
+ past the breakpoint. This is used in the case of skipping
+ signal handlers. */
+ BPSTAT_WHAT_HP_STEP_RESUME,
};
-struct bpstat_what
+/* An enum indicating the kind of "stack dummy" stop. This is a bit
+ of a misnomer because only one kind of truly a stack dummy. */
+enum stop_stack_kind
{
- enum bpstat_what_main_action main_action;
+ /* We didn't stop at a stack dummy breakpoint. */
+ STOP_NONE = 0,
+
+ /* Stopped at a stack dummy. */
+ STOP_STACK_DUMMY,
- /* Did we hit a call dummy breakpoint? This only goes with a main_action
- of BPSTAT_WHAT_STOP_SILENT or BPSTAT_WHAT_STOP_NOISY (the concept of
- continuing from a call dummy without popping the frame is not a
- useful one). */
- int call_dummy;
+ /* Stopped at std::terminate. */
+ STOP_STD_TERMINATE
};
-/* The possible return values for print_bpstat, print_it_normal,
- print_it_done, print_it_noop. */
-enum print_stop_action
+struct bpstat_what
{
- PRINT_UNKNOWN = -1,
- PRINT_SRC_AND_LOC,
- PRINT_SRC_ONLY,
- PRINT_NOTHING
+ enum bpstat_what_main_action main_action;
+
+ /* Did we hit a call dummy breakpoint? This only goes with a
+ main_action of BPSTAT_WHAT_STOP_SILENT or
+ BPSTAT_WHAT_STOP_NOISY (the concept of continuing from a call
+ dummy without popping the frame is not a useful one). */
+ enum stop_stack_kind call_dummy;
+
+ /* Used for BPSTAT_WHAT_SET_LONGJMP_RESUME and
+ BPSTAT_WHAT_CLEAR_LONGJMP_RESUME. True if we are handling a
+ longjmp, false if we are handling an exception. */
+ bool is_longjmp;
};
/* Tell what to do about this bpstat. */
struct bpstat_what bpstat_what (bpstat);
-\f
-/* Find the bpstat associated with a breakpoint. NULL otherwise. */
-bpstat bpstat_find_breakpoint (bpstat, struct breakpoint *);
-/* Find a step_resume breakpoint associated with this bpstat.
- (If there are multiple step_resume bp's on the list, this function
- will arbitrarily pick one.)
+/* Run breakpoint event callbacks associated with the breakpoints that
+ triggered. */
+extern void bpstat_run_callbacks (bpstat bs_head);
- It is an error to use this function if BPSTAT doesn't contain a
- step_resume breakpoint.
-
- See wait_for_inferior's use of this function.
- */
-extern struct breakpoint *bpstat_find_step_resume_breakpoint (bpstat);
+/* Find the bpstat associated with a breakpoint. NULL otherwise. */
+bpstat bpstat_find_breakpoint (bpstat, struct breakpoint *);
-/* Nonzero if a signal that we got in wait() was due to circumstances
- explained by the BS. */
-/* Currently that is true if we have hit a breakpoint, or if there is
- a watchpoint enabled. */
-#define bpstat_explains_signal(bs) ((bs) != NULL)
+/* True if a signal that we got in target_wait() was due to
+ circumstances explained by the bpstat; the signal is therefore not
+ random. */
+extern bool bpstat_explains_signal (bpstat, enum gdb_signal);
-/* Nonzero is this bpstat causes a stop. */
-extern int bpstat_causes_stop (bpstat);
+/* True if this bpstat causes a stop. */
+extern bool bpstat_causes_stop (bpstat);
-/* Nonzero if we should step constantly (e.g. watchpoints on machines
+/* True if we should step constantly (e.g. watchpoints on machines
without hardware support). This isn't related to a specific bpstat,
just to things like whether watchpoints are set. */
-extern int bpstat_should_step (void);
+extern bool bpstat_should_step ();
/* Print a message indicating what happened. Returns nonzero to
say that only the source line should be printed after this (zero
return means print the frame as well as the source line). */
-extern enum print_stop_action bpstat_print (bpstat);
+extern enum print_stop_action bpstat_print (bpstat, int);
+
+/* Put in *NUM the breakpoint number of the first breakpoint we are
+ stopped at. *BSP upon return is a bpstat which points to the
+ remaining breakpoints stopped at (but which is not guaranteed to be
+ good for anything but further calls to bpstat_num).
-/* Put in *NUM the breakpoint number of the first breakpoint we are stopped
- at. *BSP upon return is a bpstat which points to the remaining
- breakpoints stopped at (but which is not guaranteed to be good for
- anything but further calls to bpstat_num).
Return 0 if passed a bpstat which does not indicate any breakpoints.
Return -1 if stopped at a breakpoint that has been deleted since
we set it.
command loop). */
extern void bpstat_do_actions (void);
-/* Modify BS so that the actions will not be performed. */
-extern void bpstat_clear_actions (bpstat);
+/* Modify all entries of STOP_BPSTAT of INFERIOR_PTID so that the actions will
+ not be performed. */
+extern void bpstat_clear_actions (void);
/* Implementation: */
-/* Values used to tell the printing routine how to behave for this bpstat. */
+/* Values used to tell the printing routine how to behave for this
+ bpstat. */
enum bp_print_how
{
/* This is used when we want to do a normal printing of the reason
- for stopping. The output will depend on the type of eventpoint
- we are dealing with. This is the default value, most commonly
- used. */
+ for stopping. The output will depend on the type of eventpoint
+ we are dealing with. This is the default value, most commonly
+ used. */
print_it_normal,
- /* This is used when nothing should be printed for this bpstat entry. */
+ /* This is used when nothing should be printed for this bpstat
+ entry. */
print_it_noop,
/* This is used when everything which needs to be printed has
already been printed. But we still want to print the frame. */
struct bpstats
{
- /* Linked list because there can be two breakpoints at the same
- place, and a bpstat reflects the fact that both have been hit. */
+ bpstats ();
+ bpstats (struct bp_location *bl, bpstat **bs_link_pointer);
+ ~bpstats ();
+
+ bpstats (const bpstats &);
+ bpstats &operator= (const bpstats &) = delete;
+
+ /* Linked list because there can be more than one breakpoint at
+ the same place, and a bpstat reflects the fact that all have
+ been hit. */
bpstat next;
- /* Breakpoint that we are at. */
- const struct bp_location *breakpoint_at;
+
+ /* Location that caused the stop. Locations are refcounted, so
+ this will never be NULL. Note that this location may end up
+ detached from a breakpoint, but that does not necessary mean
+ that the struct breakpoint is gone. E.g., consider a
+ watchpoint with a condition that involves an inferior function
+ call. Watchpoint locations are recreated often (on resumes,
+ hence on infcalls too). Between creating the bpstat and after
+ evaluating the watchpoint condition, this location may hence
+ end up detached from its original owner watchpoint, even though
+ the watchpoint is still listed. If it's condition evaluates as
+ true, we still want this location to cause a stop, and we will
+ still need to know which watchpoint it was originally attached.
+ What this means is that we should not (in most cases) follow
+ the `bpstat->bp_location->owner' link, but instead use the
+ `breakpoint_at' field below. */
+ struct bp_location *bp_location_at;
+
+ /* Breakpoint that caused the stop. This is nullified if the
+ breakpoint ends up being deleted. See comments on
+ `bp_location_at' above for why do we need this field instead of
+ following the location's owner. */
+ struct breakpoint *breakpoint_at;
+
/* The associated command list. */
- struct counted_command_line *commands;
- /* Commands left to be done. This points somewhere in
- base_command. */
- struct command_line *commands_left;
+ counted_command_line commands;
+
/* Old value associated with a watchpoint. */
- struct value *old_val;
+ value_ref_ptr old_val;
/* Nonzero if this breakpoint tells us to print the frame. */
char print;
/* Prototypes for breakpoint-related functions. */
-extern enum breakpoint_here breakpoint_here_p (struct address_space *, CORE_ADDR);
+/* Return 1 if there's a program/permanent breakpoint planted in
+ memory at ADDRESS, return 0 otherwise. */
+
+extern int program_breakpoint_here_p (struct gdbarch *gdbarch, CORE_ADDR address);
+
+extern enum breakpoint_here breakpoint_here_p (const address_space *,
+ CORE_ADDR);
+
+/* Return true if an enabled breakpoint exists in the range defined by
+ ADDR and LEN, in ASPACE. */
+extern int breakpoint_in_range_p (const address_space *aspace,
+ CORE_ADDR addr, ULONGEST len);
+
+extern int moribund_breakpoint_here_p (const address_space *, CORE_ADDR);
+
+extern int breakpoint_inserted_here_p (const address_space *,
+ CORE_ADDR);
+
+extern int software_breakpoint_inserted_here_p (const address_space *,
+ CORE_ADDR);
-extern int moribund_breakpoint_here_p (struct address_space *, CORE_ADDR);
+/* Return non-zero iff there is a hardware breakpoint inserted at
+ PC. */
+extern int hardware_breakpoint_inserted_here_p (const address_space *,
+ CORE_ADDR);
-extern int breakpoint_inserted_here_p (struct address_space *, CORE_ADDR);
+/* Check whether any location of BP is inserted at PC. */
-extern int regular_breakpoint_inserted_here_p (struct address_space *, CORE_ADDR);
+extern int breakpoint_has_location_inserted_here (struct breakpoint *bp,
+ const address_space *aspace,
+ CORE_ADDR pc);
-extern int software_breakpoint_inserted_here_p (struct address_space *, CORE_ADDR);
+extern int single_step_breakpoint_inserted_here_p (const address_space *,
+ CORE_ADDR);
/* Returns true if there's a hardware watchpoint or access watchpoint
inserted in the range defined by ADDR and LEN. */
-extern int hardware_watchpoint_inserted_in_range (struct address_space *,
+extern int hardware_watchpoint_inserted_in_range (const address_space *,
CORE_ADDR addr,
ULONGEST len);
-extern int breakpoint_thread_match (struct address_space *, CORE_ADDR, ptid_t);
+/* Returns true if {ASPACE1,ADDR1} and {ASPACE2,ADDR2} represent the
+ same breakpoint location. In most targets, this can only be true
+ if ASPACE1 matches ASPACE2. On targets that have global
+ breakpoints, the address space doesn't really matter. */
-extern void until_break_command (char *, int, int);
+extern int breakpoint_address_match (const address_space *aspace1,
+ CORE_ADDR addr1,
+ const address_space *aspace2,
+ CORE_ADDR addr2);
+
+extern void until_break_command (const char *, int, int);
+
+/* Initialize a struct bp_location. */
+
+extern void update_breakpoint_locations
+ (struct breakpoint *b,
+ struct program_space *filter_pspace,
+ gdb::array_view<const symtab_and_line> sals,
+ gdb::array_view<const symtab_and_line> sals_end);
extern void breakpoint_re_set (void);
extern void breakpoint_re_set_thread (struct breakpoint *);
-extern struct breakpoint *set_momentary_breakpoint
+extern void delete_breakpoint (struct breakpoint *);
+
+struct breakpoint_deleter
+{
+ void operator() (struct breakpoint *b) const
+ {
+ delete_breakpoint (b);
+ }
+};
+
+typedef std::unique_ptr<struct breakpoint, breakpoint_deleter> breakpoint_up;
+
+extern breakpoint_up set_momentary_breakpoint
(struct gdbarch *, struct symtab_and_line, struct frame_id, enum bptype);
-extern struct breakpoint *set_momentary_breakpoint_at_pc
+extern breakpoint_up set_momentary_breakpoint_at_pc
(struct gdbarch *, CORE_ADDR pc, enum bptype type);
extern struct breakpoint *clone_momentary_breakpoint (struct breakpoint *bpkt);
extern void set_ignore_count (int, int, int);
-extern void set_default_breakpoint (int, struct program_space *,
- CORE_ADDR, struct symtab *, int);
-
extern void breakpoint_init_inferior (enum inf_context);
-extern struct cleanup *make_cleanup_delete_breakpoint (struct breakpoint *);
+extern void breakpoint_auto_delete (bpstat);
-extern void delete_breakpoint (struct breakpoint *);
+typedef void (*walk_bp_location_callback) (struct bp_location *, void *);
-extern void breakpoint_auto_delete (bpstat);
+extern void iterate_over_bp_locations (walk_bp_location_callback);
+
+/* Return the chain of command lines to execute when this breakpoint
+ is hit. */
+extern struct command_line *breakpoint_commands (struct breakpoint *b);
+
+/* Return a string image of DISP. The string is static, and thus should
+ NOT be deallocated after use. */
+const char *bpdisp_text (enum bpdisp disp);
+
+extern void break_command (const char *, int);
+
+extern void watch_command_wrapper (const char *, int, int);
+extern void awatch_command_wrapper (const char *, int, int);
+extern void rwatch_command_wrapper (const char *, int, int);
+extern void tbreak_command (const char *, int);
+
+extern struct breakpoint_ops base_breakpoint_ops;
+extern struct breakpoint_ops bkpt_breakpoint_ops;
+extern struct breakpoint_ops tracepoint_breakpoint_ops;
+extern struct breakpoint_ops dprintf_breakpoint_ops;
+
+extern void initialize_breakpoint_ops (void);
+
+/* Arguments to pass as context to some catch command handlers. */
+#define CATCH_PERMANENT ((void *) (uintptr_t) 0)
+#define CATCH_TEMPORARY ((void *) (uintptr_t) 1)
-extern void break_command (char *, int);
+/* Like add_cmd, but add the command to both the "catch" and "tcatch"
+ lists, and pass some additional user data to the command
+ function. */
-extern void hbreak_command_wrapper (char *, int);
-extern void thbreak_command_wrapper (char *, int);
-extern void rbreak_command_wrapper (char *, int);
-extern void watch_command_wrapper (char *, int);
-extern void awatch_command_wrapper (char *, int);
-extern void rwatch_command_wrapper (char *, int);
-extern void tbreak_command (char *, int);
+extern void
+ add_catch_command (const char *name, const char *docstring,
+ cmd_const_sfunc_ftype *sfunc,
+ completer_ftype *completer,
+ void *user_data_catch,
+ void *user_data_tcatch);
-extern int create_breakpoint (struct gdbarch *gdbarch, char *arg,
- char *cond_string, int thread,
- int parse_condition_and_thread,
- int tempflag, int hardwareflag, int traceflag,
+/* Initialize a breakpoint struct for Ada exception catchpoints. */
+
+extern void
+ init_ada_exception_breakpoint (struct breakpoint *b,
+ struct gdbarch *gdbarch,
+ struct symtab_and_line sal,
+ const char *addr_string,
+ const struct breakpoint_ops *ops,
+ int tempflag,
+ int enabled,
+ int from_tty);
+
+extern void init_catchpoint (struct breakpoint *b,
+ struct gdbarch *gdbarch, int tempflag,
+ const char *cond_string,
+ const struct breakpoint_ops *ops);
+
+/* Add breakpoint B on the breakpoint list, and notify the user, the
+ target and breakpoint_created observers of its existence. If
+ INTERNAL is non-zero, the breakpoint number will be allocated from
+ the internal breakpoint count. If UPDATE_GLL is non-zero,
+ update_global_location_list will be called. */
+
+extern void install_breakpoint (int internal, std::unique_ptr<breakpoint> &&b,
+ int update_gll);
+
+/* Returns the breakpoint ops appropriate for use with with LOCATION and
+ according to IS_TRACEPOINT. Use this to ensure, for example, that you pass
+ the correct ops to create_breakpoint for probe locations. If LOCATION is
+ NULL, returns bkpt_breakpoint_ops (or tracepoint_breakpoint_ops, if
+ IS_TRACEPOINT is true). */
+
+extern const struct breakpoint_ops *breakpoint_ops_for_event_location
+ (const struct event_location *location, bool is_tracepoint);
+
+/* Flags that can be passed down to create_breakpoint, etc., to affect
+ breakpoint creation in several ways. */
+
+enum breakpoint_create_flags
+ {
+ /* We're adding a breakpoint to our tables that is already
+ inserted in the target. */
+ CREATE_BREAKPOINT_FLAGS_INSERTED = 1 << 0
+ };
+
+/* Set a breakpoint. This function is shared between CLI and MI functions
+ for setting a breakpoint at LOCATION.
+
+ This function has two major modes of operations, selected by the
+ PARSE_EXTRA parameter.
+
+ If PARSE_EXTRA is zero, LOCATION is just the breakpoint's location,
+ with condition, thread, and extra string specified by the COND_STRING,
+ THREAD, and EXTRA_STRING parameters.
+
+ If PARSE_EXTRA is non-zero, this function will attempt to extract
+ the condition, thread, and extra string from EXTRA_STRING, ignoring
+ the similarly named parameters.
+
+ If INTERNAL is non-zero, the breakpoint number will be allocated
+ from the internal breakpoint count.
+
+ Returns true if any breakpoint was created; false otherwise. */
+
+extern int create_breakpoint (struct gdbarch *gdbarch,
+ const struct event_location *location,
+ const char *cond_string, int thread,
+ const char *extra_string,
+ int parse_extra,
+ int tempflag, enum bptype wanted_type,
int ignore_count,
enum auto_boolean pending_break_support,
- struct breakpoint_ops *ops,
+ const struct breakpoint_ops *ops,
int from_tty,
- int enabled);
+ int enabled,
+ int internal, unsigned flags);
extern void insert_breakpoints (void);
extern int remove_breakpoints (void);
-extern int remove_breakpoints_pid (int pid);
+/* Remove breakpoints of inferior INF. */
-/* This function can be used to physically insert eventpoints from the
- specified traced inferior process, without modifying the breakpoint
- package's state. This can be useful for those targets which support
- following the processes of a fork() or vfork() system call, when both
- of the resulting two processes are to be followed. */
-extern int reattach_breakpoints (int);
+extern void remove_breakpoints_inf (inferior *inf);
/* This function can be used to update the breakpoint package's state
after an exec() system call has been executed.
- A step-resume breakpoint, if any, is explicitly removed from the
breakpoint list.
- All eventpoints without a symbolic address are removed from the
- breakpoint list. */
+ breakpoint list. */
extern void update_breakpoints_after_exec (void);
/* This function can be used to physically remove hardware breakpoints
It is an error to use this function on the process whose id is
inferior_ptid. */
-extern int detach_breakpoints (int);
+extern int detach_breakpoints (ptid_t ptid);
/* This function is called when program space PSPACE is about to be
deleted. It takes care of updating breakpoints to not reference
this PSPACE anymore. */
extern void breakpoint_program_space_exit (struct program_space *pspace);
-extern void set_longjmp_breakpoint (int thread);
+extern void set_longjmp_breakpoint (struct thread_info *tp,
+ struct frame_id frame);
extern void delete_longjmp_breakpoint (int thread);
+/* Mark all longjmp breakpoints from THREAD for later deletion. */
+extern void delete_longjmp_breakpoint_at_next_stop (int thread);
+
+extern struct breakpoint *set_longjmp_breakpoint_for_call_dummy (void);
+extern void check_longjmp_breakpoint_for_call_dummy (struct thread_info *tp);
+
extern void enable_overlay_breakpoints (void);
extern void disable_overlay_breakpoints (void);
+extern void set_std_terminate_breakpoint (void);
+extern void delete_std_terminate_breakpoint (void);
+
/* These functions respectively disable or reenable all currently
enabled watchpoints. When disabled, the watchpoints are marked
- call_disabled. When reenabled, they are marked enabled.
+ call_disabled. When re-enabled, they are marked enabled.
The intended client of these functions is call_function_by_hand.
and that can cause execution control to become very confused.
Note that if a user sets breakpoints in an interactively called
- function, the call_disabled watchpoints will have been reenabled
+ function, the call_disabled watchpoints will have been re-enabled
when the first such breakpoint is reached. However, on targets
that are unable to unwind through the call dummy frame, watches
of stack-based storage may then be deleted, because gdb will
extern void enable_breakpoints_after_startup (void);
/* For script interpreters that need to define breakpoint commands
- after they've already read the commands into a struct command_line. */
+ after they've already read the commands into a struct
+ command_line. */
extern enum command_control_type commands_from_control_command
- (char *arg, struct command_line *cmd);
+ (const char *arg, struct command_line *cmd);
extern void clear_breakpoint_hit_counts (void);
-extern int get_number (char **);
-
-extern int get_number_or_range (char **);
-
extern struct breakpoint *get_breakpoint (int num);
-/* The following are for displays, which aren't really breakpoints, but
- here is as good a place as any for them. */
+/* The following are for displays, which aren't really breakpoints,
+ but here is as good a place as any for them. */
extern void disable_current_display (void);
extern void enable_breakpoint (struct breakpoint *);
extern void breakpoint_set_commands (struct breakpoint *b,
- struct command_line *commands);
+ counted_command_line &&commands);
+
+extern void breakpoint_set_silent (struct breakpoint *b, int silent);
+
+extern void breakpoint_set_thread (struct breakpoint *b, int thread);
+
+extern void breakpoint_set_task (struct breakpoint *b, int task);
/* Clear the "inserted" flag in all breakpoints. */
extern void mark_breakpoints_out (void);
-extern void make_breakpoint_permanent (struct breakpoint *);
-
extern struct breakpoint *create_jit_event_breakpoint (struct gdbarch *,
CORE_ADDR);
extern struct breakpoint *create_solib_event_breakpoint (struct gdbarch *,
CORE_ADDR);
+/* Create an solib event breakpoint at ADDRESS in the current program
+ space, and immediately try to insert it. Returns a pointer to the
+ breakpoint on success. Deletes the new breakpoint and returns NULL
+ if inserting the breakpoint fails. */
+extern struct breakpoint *create_and_insert_solib_event_breakpoint
+ (struct gdbarch *gdbarch, CORE_ADDR address);
+
extern struct breakpoint *create_thread_event_breakpoint (struct gdbarch *,
CORE_ADDR);
+extern void remove_jit_event_breakpoints (void);
+
extern void remove_solib_event_breakpoints (void);
-extern void remove_thread_event_breakpoints (void);
+/* Mark solib event breakpoints of the current program space with
+ delete at next stop disposition. */
+extern void remove_solib_event_breakpoints_at_next_stop (void);
extern void disable_breakpoints_in_shlibs (void);
-/* This function returns TRUE if ep is a catchpoint. */
-extern int ep_is_catchpoint (struct breakpoint *);
+/* This function returns true if B is a catchpoint. */
-/* Enable breakpoints and delete when hit. Called with ARG == NULL
- deletes all breakpoints. */
-extern void delete_command (char *arg, int from_tty);
+extern bool is_catchpoint (struct breakpoint *b);
-/* Pull all H/W watchpoints from the target. Return non-zero if the
- remove fails. */
-extern int remove_hw_watchpoints (void);
+/* Shared helper function (MI and CLI) for creating and installing
+ a shared object event catchpoint. */
+extern void add_solib_catchpoint (const char *arg, int is_load, int is_temp,
+ int enabled);
-/* Manage a software single step breakpoint (or two). Insert may be called
- twice before remove is called. */
+/* Create and insert a new software single step breakpoint for the
+ current thread. May be called multiple times; each time will add a
+ new location to the set of potential addresses the next instruction
+ is at. */
extern void insert_single_step_breakpoint (struct gdbarch *,
- struct address_space *, CORE_ADDR);
-extern void remove_single_step_breakpoints (void);
+ const address_space *,
+ CORE_ADDR);
-/* Manage manual breakpoints, separate from the normal chain of
- breakpoints. These functions are used in murky target-specific
- ways. Please do not add more uses! */
-extern void *deprecated_insert_raw_breakpoint (struct gdbarch *,
- struct address_space *, CORE_ADDR);
-extern int deprecated_remove_raw_breakpoint (struct gdbarch *, void *);
+/* Insert all software single step breakpoints for the current frame.
+ Return true if any software single step breakpoints are inserted,
+ otherwise, return false. */
+extern int insert_single_step_breakpoints (struct gdbarch *);
/* Check if any hardware watchpoints have triggered, according to the
target. */
int watchpoints_triggered (struct target_waitstatus *);
-/* Update BUF, which is LEN bytes read from the target address MEMADDR,
- by replacing any memory breakpoints with their shadowed contents. */
-void breakpoint_restore_shadows (gdb_byte *buf, ULONGEST memaddr,
- LONGEST len);
+/* Helper for transparent breakpoint hiding for memory read and write
+ routines.
-extern int breakpoints_always_inserted_mode (void);
+ Update one of READBUF or WRITEBUF with either the shadows
+ (READBUF), or the breakpoint instructions (WRITEBUF) of inserted
+ breakpoints at the memory range defined by MEMADDR and extending
+ for LEN bytes. If writing, then WRITEBUF is a copy of WRITEBUF_ORG
+ on entry.*/
+extern void breakpoint_xfer_memory (gdb_byte *readbuf, gdb_byte *writebuf,
+ const gdb_byte *writebuf_org,
+ ULONGEST memaddr, LONGEST len);
+
+/* Return true if breakpoints should be inserted now. That'll be the
+ case if either:
+
+ - the target has global breakpoints.
+
+ - "breakpoint always-inserted" is on, and the target has
+ execution.
+
+ - threads are executing.
+*/
+extern int breakpoints_should_be_inserted_now (void);
/* Called each time new event from target is processed.
Retires previously deleted breakpoint locations that
in our opinion won't ever trigger. */
extern void breakpoint_retire_moribund (void);
+/* Set break condition of breakpoint B to EXP. */
+extern void set_breakpoint_condition (struct breakpoint *b, const char *exp,
+ int from_tty);
+
/* Checks if we are catching syscalls or not.
Returns 0 if not, greater than 0 if we are. */
extern int catch_syscall_enabled (void);
Returns 0 if not, greater than 0 if we are. */
extern int catching_syscall_number (int syscall_number);
-/* Tell a breakpoint to be quiet. */
-extern void make_breakpoint_silent (struct breakpoint *);
-
/* Return a tracepoint with the given number if found. */
-extern struct breakpoint *get_tracepoint (int num);
+extern struct tracepoint *get_tracepoint (int num);
-extern struct breakpoint *get_tracepoint_by_number_on_target (int num);
+extern struct tracepoint *get_tracepoint_by_number_on_target (int num);
/* Find a tracepoint by parsing a number in the supplied string. */
-extern struct breakpoint *get_tracepoint_by_number (char **arg, int multi_p,
- int optional_p);
+extern struct tracepoint *
+ get_tracepoint_by_number (const char **arg,
+ number_or_range_parser *parser);
+
+/* Return a vector of all tracepoints currently defined. */
+extern std::vector<breakpoint *> all_tracepoints (void);
+
+/* Return true if B is of tracepoint kind. */
+
+extern bool is_tracepoint (const struct breakpoint *b);
+
+/* Return a vector of all static tracepoints defined at ADDR. */
+extern std::vector<breakpoint *> static_tracepoints_here (CORE_ADDR addr);
+
+/* Create an instance of this to start registering breakpoint numbers
+ for a later "commands" command. */
+
+class scoped_rbreak_breakpoints
+{
+public:
+
+ scoped_rbreak_breakpoints ();
+ ~scoped_rbreak_breakpoints ();
+
+ DISABLE_COPY_AND_ASSIGN (scoped_rbreak_breakpoints);
+};
+
+/* Breakpoint iterator function.
+
+ Calls a callback function once for each breakpoint, so long as the
+ callback function returns false. If the callback function returns
+ true, the iteration will end and the current breakpoint will be
+ returned. This can be useful for implementing a search for a
+ breakpoint with arbitrary attributes, or for applying an operation
+ to every breakpoint. */
+extern struct breakpoint *iterate_over_breakpoints
+ (gdb::function_view<bool (breakpoint *)>);
+
+/* Nonzero if the specified PC cannot be a location where functions
+ have been inlined. */
+
+extern int pc_at_non_inline_function (const address_space *aspace,
+ CORE_ADDR pc,
+ const struct target_waitstatus *ws);
+
+extern int user_breakpoint_p (struct breakpoint *);
+
+/* Return true if this breakpoint is pending, false if not. */
+extern int pending_breakpoint_p (struct breakpoint *);
+
+/* Attempt to determine architecture of location identified by SAL. */
+extern struct gdbarch *get_sal_arch (struct symtab_and_line sal);
+
+extern void breakpoint_free_objfile (struct objfile *objfile);
+
+extern const char *ep_parse_optional_if_clause (const char **arg);
+
+/* Print the "Thread ID hit" part of "Thread ID hit Breakpoint N" to
+ UIOUT iff debugging multiple threads. */
+extern void maybe_print_thread_hit_breakpoint (struct ui_out *uiout);
+
+/* Print the specified breakpoint. */
+extern void print_breakpoint (breakpoint *bp);
+
+/* Command element for the 'commands' command. */
+extern cmd_list_element *commands_cmd_element;
-/* Return a vector of all tracepoints currently defined. The vector
- is newly allocated; the caller should free when done with it. */
-extern VEC(breakpoint_p) *all_tracepoints (void);
+/* Whether to use the fixed output when printing information about a
+ multi-location breakpoint (see PR 9659). */
-extern int breakpoint_is_tracepoint (const struct breakpoint *b);
+extern bool fix_multi_location_breakpoint_output_globally;
-/* Function that can be passed to read_command_line to validate
- that each command is suitable for tracepoint command list. */
-extern void check_tracepoint_command (char *line, void *closure);
+/* Deal with "catch catch", "catch throw", and "catch rethrow" commands and
+ the MI equivalents. Sets up to catch events of type EX_EVENT. When
+ TEMPFLAG is true only the next matching event is caught after which the
+ catch-point is deleted. If REGEX is not NULL then only exceptions whose
+ type name matches REGEX will trigger the event. */
-/* Call at the start and end of an "rbreak" command to register
- breakpoint numbers for a later "commands" command. */
-extern void start_rbreak_breakpoints (void);
-extern void end_rbreak_breakpoints (void);
+extern void catch_exception_event (enum exception_event_kind ex_event,
+ const char *regex, bool tempflag,
+ int from_tty);
#endif /* !defined (BREAKPOINT_H) */
projects / deliverable / binutils-gdb.git / blobdiff