/* Definitions for dealing with stack frames, for GDB, the GNU debugger.
Copyright (C) 1986-2024 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see . */
#ifndef GDB_FRAME_H
#define GDB_FRAME_H
/* The following is the intended naming schema for frame functions.
It isn't 100% consistent, but it is approaching that. Frame naming
schema:
Prefixes:
get_frame_WHAT...(): Get WHAT from the THIS frame (functionally
equivalent to THIS->next->unwind->what)
frame_unwind_WHAT...(): Unwind THIS frame's WHAT from the NEXT
frame.
frame_unwind_caller_WHAT...(): Unwind WHAT for NEXT stack frame's
real caller. Any inlined functions in NEXT's stack frame are
skipped. Use these to ignore any potentially inlined functions,
e.g. inlined into the first instruction of a library trampoline.
get_stack_frame_WHAT...(): Get WHAT for THIS frame, but if THIS is
inlined, skip to the containing stack frame.
put_frame_WHAT...(): Put a value into this frame (unsafe, need to
invalidate the frame / regcache afterwards) (better name more
strongly hinting at its unsafeness)
safe_....(): Safer version of various functions, doesn't throw an
error (leave this for later?). Returns true / non-NULL if the request
succeeds, false / NULL otherwise.
Suffixes:
void /frame/_WHAT(): Read WHAT's value into the buffer parameter.
ULONGEST /frame/_WHAT_unsigned(): Return an unsigned value (the
alternative is *frame_unsigned_WHAT).
LONGEST /frame/_WHAT_signed(): Return WHAT signed value.
What:
/frame/_memory* (frame, coreaddr, len [, buf]): Extract/return
*memory.
/frame/_register* (frame, regnum [, buf]): extract/return register.
CORE_ADDR /frame/_{pc,sp,...} (frame): Resume address, innner most
stack *address, ...
*/
#include "cli/cli-option.h"
#include "frame-id.h"
#include "gdbsupport/common-debug.h"
#include "gdbsupport/intrusive_list.h"
struct symtab_and_line;
struct frame_unwind;
struct frame_base;
struct block;
struct gdbarch;
struct ui_file;
struct ui_out;
struct frame_print_options;
/* The frame object. */
/* Save and restore the currently selected frame. */
class scoped_restore_selected_frame
{
public:
/* Save the currently selected frame. */
scoped_restore_selected_frame ();
/* Restore the currently selected frame. */
~scoped_restore_selected_frame ();
DISABLE_COPY_AND_ASSIGN (scoped_restore_selected_frame);
private:
/* The ID and level of the previously selected frame. */
struct frame_id m_fid;
int m_level;
/* Save/restore the language as well, because selecting a frame
changes the current language to the frame's language if "set
language auto". */
enum language m_lang;
};
/* Flag to control debugging. */
extern bool frame_debug;
/* Print a "frame" debug statement. */
#define frame_debug_printf(fmt, ...) \
debug_prefixed_printf_cond (frame_debug, "frame", fmt, ##__VA_ARGS__)
/* Print "frame" enter/exit debug statements. */
#define FRAME_SCOPED_DEBUG_ENTER_EXIT \
scoped_debug_enter_exit (frame_debug, "frame")
/* Construct a frame ID. The first parameter is the frame's constant
stack address (typically the outer-bound), and the second the
frame's constant code address (typically the entry point).
The special identifier address is set to indicate a wild card. */
extern struct frame_id frame_id_build (CORE_ADDR stack_addr,
CORE_ADDR code_addr);
/* Construct a special frame ID. The first parameter is the frame's constant
stack address (typically the outer-bound), the second is the
frame's constant code address (typically the entry point),
and the third parameter is the frame's special identifier address. */
extern struct frame_id frame_id_build_special (CORE_ADDR stack_addr,
CORE_ADDR code_addr,
CORE_ADDR special_addr);
/* Construct a frame ID representing a frame where the stack address
exists, but is unavailable. CODE_ADDR is the frame's constant code
address (typically the entry point). The special identifier
address is set to indicate a wild card. */
extern struct frame_id frame_id_build_unavailable_stack (CORE_ADDR code_addr);
/* Construct a frame ID representing a frame where the stack address
exists, but is unavailable. CODE_ADDR is the frame's constant code
address (typically the entry point). SPECIAL_ADDR is the special
identifier address. */
extern struct frame_id
frame_id_build_unavailable_stack_special (CORE_ADDR code_addr,
CORE_ADDR special_addr);
/* Construct a wild card frame ID. The parameter is the frame's constant
stack address (typically the outer-bound). The code address as well
as the special identifier address are set to indicate wild cards. */
extern struct frame_id frame_id_build_wild (CORE_ADDR stack_addr);
/* Construct a frame ID for a sentinel frame.
If either STACK_ADDR or CODE_ADDR is not 0, the ID represents a sentinel
frame for a user-created frame. STACK_ADDR and CODE_ADDR are the addresses
used to create the frame.
If STACK_ADDR and CODE_ADDR are both 0, the ID represents a regular sentinel
frame (i.e. the "next" frame of the target's current frame). */
extern frame_id frame_id_build_sentinel (CORE_ADDR stack_addr, CORE_ADDR code_addr);
/* Returns true when L is a valid frame. */
extern bool frame_id_p (frame_id l);
/* Returns true when L is a valid frame representing a frame made up by GDB
without stack data representation in inferior, such as INLINE_FRAME or
TAILCALL_FRAME. */
extern bool frame_id_artificial_p (frame_id l);
/* Frame types. Some are real, some are signal trampolines, and some
are completely artificial (dummy). */
enum frame_type
{
/* A true stack frame, created by the target program during normal
execution. */
NORMAL_FRAME,
/* A fake frame, created by GDB when performing an inferior function
call. */
DUMMY_FRAME,
/* A frame representing an inlined function, associated with an
upcoming (prev, outer, older) NORMAL_FRAME. */
INLINE_FRAME,
/* A virtual frame of a tail call - see dwarf2_tailcall_frame_unwind. */
TAILCALL_FRAME,
/* In a signal handler, various OSs handle this in various ways.
The main thing is that the frame may be far from normal. */
SIGTRAMP_FRAME,
/* Fake frame representing a cross-architecture call. */
ARCH_FRAME,
/* Sentinel or registers frame. This frame obtains register values
direct from the inferior's registers. */
SENTINEL_FRAME
};
/* Return a string representation of TYPE. */
extern const char *frame_type_str (frame_type type);
/* A wrapper for "frame_info *". frame_info objects are invalidated
whenever reinit_frame_cache is called. This class arranges to
invalidate the pointer when appropriate. This is done to help
detect a GDB bug that was relatively common.
A small amount of code must still operate on raw pointers, so a
"get" method is provided. However, you should normally not use
this in new code. */
class frame_info_ptr : public intrusive_list_node
{
public:
/* Create a frame_info_ptr from a raw pointer. */
explicit frame_info_ptr (struct frame_info *ptr);
/* Create a null frame_info_ptr. */
frame_info_ptr ()
{
frame_list.push_back (*this);
}
frame_info_ptr (std::nullptr_t)
{
frame_list.push_back (*this);
}
frame_info_ptr (const frame_info_ptr &other)
: m_ptr (other.m_ptr),
m_cached_id (other.m_cached_id),
m_cached_level (other.m_cached_level)
{
frame_list.push_back (*this);
}
frame_info_ptr (frame_info_ptr &&other)
: m_ptr (other.m_ptr),
m_cached_id (other.m_cached_id),
m_cached_level (other.m_cached_level)
{
other.m_ptr = nullptr;
other.m_cached_id = null_frame_id;
other.m_cached_level = invalid_level;
frame_list.push_back (*this);
}
~frame_info_ptr ()
{
/* If this node has static storage, it should be be deleted before
frame_list. */
frame_list.erase (frame_list.iterator_to (*this));
}
frame_info_ptr &operator= (const frame_info_ptr &other)
{
m_ptr = other.m_ptr;
m_cached_id = other.m_cached_id;
m_cached_level = other.m_cached_level;
return *this;
}
frame_info_ptr &operator= (std::nullptr_t)
{
m_ptr = nullptr;
m_cached_id = null_frame_id;
m_cached_level = invalid_level;
return *this;
}
frame_info_ptr &operator= (frame_info_ptr &&other)
{
m_ptr = other.m_ptr;
m_cached_id = other.m_cached_id;
m_cached_level = other.m_cached_level;
other.m_ptr = nullptr;
other.m_cached_id = null_frame_id;
other.m_cached_level = invalid_level;
return *this;
}
frame_info *operator-> () const
{ return this->reinflate (); }
/* Fetch the underlying pointer. Note that new code should
generally not use this -- avoid it if at all possible. */
frame_info *get () const
{
if (this->is_null ())
return nullptr;
return this->reinflate ();
}
/* Return true if this object is empty (does not wrap a frame_info
object). */
bool is_null () const
{
return m_cached_level == this->invalid_level;
};
/* This exists for compatibility with pre-existing code that checked
a "frame_info *" using "!". */
bool operator! () const
{
return this->is_null ();
}
/* This exists for compatibility with pre-existing code that checked
a "frame_info *" like "if (ptr)". */
explicit operator bool () const
{
return !this->is_null ();
}
/* Invalidate this pointer. */
void invalidate ()
{
m_ptr = nullptr;
}
private:
/* We sometimes need to construct frame_info_ptr objects around the
sentinel_frame, which has level -1. Therefore, make the invalid frame
level value -2. */
static constexpr int invalid_level = -2;
/* Use the cached frame level and id to reinflate the pointer, and return
it. */
frame_info *reinflate () const;
/* The underlying pointer. */
mutable frame_info *m_ptr = nullptr;
/* The frame_id of the underlying pointer.
For the current target frames (frames with level 0, obtained through
get_current_frame), we don't save the frame id, we leave it at
null_frame_id. For user-created frames (also with level 0, but created
with create_new_frame), we do save the id. */
frame_id m_cached_id = null_frame_id;
/* The frame level of the underlying pointer. */
int m_cached_level = invalid_level;
/* All frame_info_ptr objects are kept on an intrusive list.
This keeps their construction and destruction costs
reasonably small. */
static intrusive_list frame_list;
/* A friend so it can invalidate the pointers. */
friend void reinit_frame_cache ();
};
static inline bool
operator== (const frame_info *self, const frame_info_ptr &other)
{
if (self == nullptr || other.is_null ())
return self == nullptr && other.is_null ();
return self == other.get ();
}
static inline bool
operator== (const frame_info_ptr &self, const frame_info_ptr &other)
{
if (self.is_null () || other.is_null ())
return self.is_null () && other.is_null ();
return self.get () == other.get ();
}
static inline bool
operator== (const frame_info_ptr &self, const frame_info *other)
{
if (self.is_null () || other == nullptr)
return self.is_null () && other == nullptr;
return self.get () == other;
}
static inline bool
operator!= (const frame_info *self, const frame_info_ptr &other)
{
return !(self == other);
}
static inline bool
operator!= (const frame_info_ptr &self, const frame_info_ptr &other)
{
return !(self == other);
}
static inline bool
operator!= (const frame_info_ptr &self, const frame_info *other)
{
return !(self == other);
}
/* For every stopped thread, GDB tracks two frames: current and
selected. Current frame is the inner most frame of the selected
thread. Selected frame is the one being examined by the GDB
CLI (selected using `up', `down', ...). The frames are created
on-demand (via get_prev_frame()) and then held in a frame cache. */
/* FIXME: cagney/2002-11-28: Er, there is a lie here. If you do the
sequence: `thread 1; up; thread 2; thread 1' you lose thread 1's
selected frame. At present GDB only tracks the selected frame of
the current thread. But be warned, that might change. */
/* FIXME: cagney/2002-11-14: At any time, only one thread's selected
and current frame can be active. Switching threads causes gdb to
discard all that cached frame information. Ulgh! Instead, current
and selected frame should be bound to a thread. */
/* On demand, create the inner most frame using information found in
the inferior. If the inner most frame can't be created, throw an
error. */
extern frame_info_ptr get_current_frame (void);
/* Does the current target interface have enough state to be able to
query the current inferior for frame info, and is the inferior in a
state where that is possible? */
extern bool has_stack_frames ();
/* Invalidates the frame cache (this function should have been called
invalidate_cached_frames).
FIXME: cagney/2002-11-28: There should be two methods: one that
reverts the thread's selected frame back to current frame (for when
the inferior resumes) and one that does not (for when the user
modifies the target invalidating the frame cache). */
extern void reinit_frame_cache (void);
/* Return the selected frame. Always returns non-NULL. If there
isn't an inferior sufficient for creating a frame, an error is
thrown. When MESSAGE is non-NULL, use it for the error message,
otherwise use a generic error message. */
/* FIXME: cagney/2002-11-28: At present, when there is no selected
frame, this function always returns the current (inner most) frame.
It should instead, when a thread has previously had its frame
selected (but not resumed) and the frame cache invalidated, find
and then return that thread's previously selected frame. */
extern frame_info_ptr get_selected_frame (const char *message = nullptr);
/* Select a specific frame. */
extern void select_frame (const frame_info_ptr &);
/* Save the frame ID and frame level of the selected frame in FRAME_ID
and FRAME_LEVEL, to be restored later with restore_selected_frame.
This is preferred over getting the same info out of
get_selected_frame directly because this function does not create
the selected-frame's frame_info object if it hasn't been created
yet, and thus is more efficient and doesn't throw. */
extern void save_selected_frame (frame_id *frame_id, int *frame_level)
noexcept;
/* Restore selected frame as saved with save_selected_frame.
Does not try to find the corresponding frame_info object. Instead
the next call to get_selected_frame will look it up and cache the
result.
This function does not throw. It is designed to be safe to called
from the destructors of RAII types. */
extern void restore_selected_frame (frame_id frame_id, int frame_level)
noexcept;
/* Given a FRAME, return the next (more inner, younger) or previous
(more outer, older) frame. */
extern frame_info_ptr get_prev_frame (const frame_info_ptr &);
extern frame_info_ptr get_next_frame (const frame_info_ptr &);
/* Like get_next_frame(), but allows return of the sentinel frame. NULL
is never returned. */
extern frame_info_ptr get_next_frame_sentinel_okay (const frame_info_ptr &);
/* Return a "struct frame_info" corresponding to the frame that called
THIS_FRAME. Returns NULL if there is no such frame.
Unlike get_prev_frame, this function always tries to unwind the
frame. */
extern frame_info_ptr get_prev_frame_always (const frame_info_ptr &);
/* Given a frame's ID, relocate the frame. Returns NULL if the frame
is not found. */
extern frame_info_ptr frame_find_by_id (frame_id id);
/* Base attributes of a frame: */
/* The frame's `resume' address. Where the program will resume in
this frame.
This replaced: frame->pc; */
extern CORE_ADDR get_frame_pc (const frame_info_ptr &);
/* Same as get_frame_pc, but return a boolean indication of whether
the PC is actually available, instead of throwing an error. */
extern bool get_frame_pc_if_available (const frame_info_ptr &frame, CORE_ADDR *pc);
/* An address (not necessarily aligned to an instruction boundary)
that falls within THIS frame's code block.
When a function call is the last statement in a block, the return
address for the call may land at the start of the next block.
Similarly, if a no-return function call is the last statement in
the function, the return address may end up pointing beyond the
function, and possibly at the start of the next function.
These methods make an allowance for this. For call frames, this
function returns the frame's PC-1 which "should" be an address in
the frame's block. */
extern CORE_ADDR get_frame_address_in_block (const frame_info_ptr &this_frame);
/* Same as get_frame_address_in_block, but returns a boolean
indication of whether the frame address is determinable (when the
PC is unavailable, it will not be), instead of possibly throwing an
error trying to read an unavailable PC. */
extern bool get_frame_address_in_block_if_available (const frame_info_ptr &this_frame,
CORE_ADDR *pc);
/* The frame's inner-most bound. AKA the stack-pointer. Confusingly
known as top-of-stack. */
extern CORE_ADDR get_frame_sp (const frame_info_ptr &);
/* Following on from the `resume' address. Return the entry point
address of the function containing that resume address, or zero if
that function isn't known. */
extern CORE_ADDR get_frame_func (const frame_info_ptr &fi);
/* Same as get_frame_func, but returns a boolean indication of whether
the frame function is determinable (when the PC is unavailable, it
will not be), instead of possibly throwing an error trying to read
an unavailable PC. */
extern bool get_frame_func_if_available (const frame_info_ptr &fi, CORE_ADDR *);
/* Closely related to the resume address, various symbol table
attributes that are determined by the PC. Note that for a normal
frame, the PC refers to the resume address after the return, and
not the call instruction. In such a case, the address is adjusted
so that it (approximately) identifies the call site (and not the
return site).
NOTE: cagney/2002-11-28: The frame cache could be used to cache the
computed value. Working on the assumption that the bottle-neck is
in the single step code, and that code causes the frame cache to be
constantly flushed, caching things in a frame is probably of little
benefit. As they say `show us the numbers'.
NOTE: cagney/2002-11-28: Plenty more where this one came from:
find_frame_block(), find_frame_partial_function(),
find_frame_symtab(), find_frame_function(). Each will need to be
carefully considered to determine if the real intent was for it to
apply to the PC or the adjusted PC. */
extern symtab_and_line find_frame_sal (const frame_info_ptr &frame);
/* Set the current source and line to the location given by frame
FRAME, if possible. */
void set_current_sal_from_frame (const frame_info_ptr &);
/* Return the frame base (what ever that is) (DEPRECATED).
Old code was trying to use this single method for two conflicting
purposes. Such code needs to be updated to use either of:
get_frame_id: A low level frame unique identifier, that consists of
both a stack and a function address, that can be used to uniquely
identify a frame. This value is determined by the frame's
low-level unwinder, the stack part [typically] being the
top-of-stack of the previous frame, and the function part being the
function's start address. Since the correct identification of a
frameless function requires both a stack and function address,
the old get_frame_base method was not sufficient.
get_frame_base_address: get_frame_locals_address:
get_frame_args_address: A set of high-level debug-info dependant
addresses that fall within the frame. These addresses almost
certainly will not match the stack address part of a frame ID (as
returned by get_frame_base).
This replaced: frame->frame; */
extern CORE_ADDR get_frame_base (const frame_info_ptr &);
/* Return the per-frame unique identifier. Can be used to relocate a
frame after a frame cache flush (and other similar operations). If
FI is NULL, return the null_frame_id. */
extern frame_id get_frame_id (const frame_info_ptr &fi);
extern frame_id get_stack_frame_id (const frame_info_ptr &fi);
extern frame_id frame_unwind_caller_id (const frame_info_ptr &next_frame);
/* Assuming that a frame is `normal', return its base-address, or 0 if
the information isn't available. NOTE: This address is really only
meaningful to the frame's high-level debug info. */
extern CORE_ADDR get_frame_base_address (const frame_info_ptr &);
/* Assuming that a frame is `normal', return the base-address of the
local variables, or 0 if the information isn't available. NOTE:
This address is really only meaningful to the frame's high-level
debug info. Typically, the argument and locals share a single
base-address. */
extern CORE_ADDR get_frame_locals_address (const frame_info_ptr &);
/* Assuming that a frame is `normal', return the base-address of the
parameter list, or 0 if that information isn't available. NOTE:
This address is really only meaningful to the frame's high-level
debug info. Typically, the argument and locals share a single
base-address. */
extern CORE_ADDR get_frame_args_address (const frame_info_ptr &);
/* The frame's level: 0 for innermost, 1 for its caller, ...; or -1
for an invalid frame). */
extern int frame_relative_level (const frame_info_ptr &fi);
/* Return the frame's type. */
extern enum frame_type get_frame_type (const frame_info_ptr &);
/* Return the frame's program space. */
extern struct program_space *get_frame_program_space (const frame_info_ptr &);
/* Unwind THIS frame's program space from the NEXT frame. */
extern struct program_space *frame_unwind_program_space (const frame_info_ptr &);
class address_space;
/* Return the frame's address space. */
extern const address_space *get_frame_address_space (const frame_info_ptr &);
/* A frame may have a "static link". That is, in some languages, a
nested function may have access to variables from the enclosing
block and frame. This function looks for a frame's static link.
If found, returns the corresponding frame; otherwise, returns a
null frame_info_ptr. */
extern frame_info_ptr frame_follow_static_link (const frame_info_ptr &frame);
/* For frames where we can not unwind further, describe why. */
enum unwind_stop_reason
{
#define SET(name, description) name,
#define FIRST_ENTRY(name) UNWIND_FIRST = name,
#define LAST_ENTRY(name) UNWIND_LAST = name,
#define FIRST_ERROR(name) UNWIND_FIRST_ERROR = name,
#include "unwind_stop_reasons.def"
#undef SET
#undef FIRST_ENTRY
#undef LAST_ENTRY
#undef FIRST_ERROR
};
/* Return the reason why we can't unwind past this frame. */
enum unwind_stop_reason get_frame_unwind_stop_reason (const frame_info_ptr &);
/* Translate a reason code to an informative string. This converts the
generic stop reason codes into a generic string describing the code.
For a possibly frame specific string explaining the stop reason, use
FRAME_STOP_REASON_STRING instead. */
const char *unwind_stop_reason_to_string (enum unwind_stop_reason);
/* Return a possibly frame specific string explaining why the unwind
stopped here. E.g., if unwinding tripped on a memory error, this
will return the error description string, which includes the address
that we failed to access. If there's no specific reason stored for
a frame then a generic reason string will be returned.
Should only be called for frames that don't have a previous frame. */
const char *frame_stop_reason_string (const frame_info_ptr &);
/* Unwind the stack frame so that the value of REGNUM, in the previous
(up, older) frame is returned. If VALUEP is NULL, don't
fetch/compute the value. Instead just return the location of the
value. */
extern void frame_register_unwind (const frame_info_ptr &frame, int regnum,
int *optimizedp, int *unavailablep,
enum lval_type *lvalp,
CORE_ADDR *addrp, int *realnump,
gdb_byte *valuep);
/* Fetch a register from this, or unwind a register from the next
frame. Note that the get_frame methods are wrappers to
frame->next->unwind. They all [potentially] throw an error if the
fetch fails. The value methods never return NULL, but usually
do return a lazy value. */
extern void frame_unwind_register (const frame_info_ptr &next_frame,
int regnum, gdb_byte *buf);
extern void get_frame_register (const frame_info_ptr &frame,
int regnum, gdb_byte *buf);
struct value *frame_unwind_register_value (const frame_info_ptr &next_frame,
int regnum);
struct value *get_frame_register_value (const frame_info_ptr &frame,
int regnum);
extern LONGEST frame_unwind_register_signed (const frame_info_ptr &next_frame,
int regnum);
extern LONGEST get_frame_register_signed (const frame_info_ptr &frame,
int regnum);
extern ULONGEST frame_unwind_register_unsigned
(const frame_info_ptr &next_frame, int regnum);
extern ULONGEST get_frame_register_unsigned (const frame_info_ptr &frame,
int regnum);
/* Read a register from this, or unwind a register from the next
frame. Note that the read_frame methods are wrappers to
get_frame_register_value, that do not throw if the result is
optimized out or unavailable. */
extern bool read_frame_register_unsigned (const frame_info_ptr &frame,
int regnum, ULONGEST *val);
/* The reverse. Store a register value relative to NEXT_FRAME's previous frame.
Note: this call makes the frame's state undefined. The register and frame
caches must be flushed. */
extern void put_frame_register (const frame_info_ptr &next_frame, int regnum,
gdb::array_view buf);
/* Read LEN bytes from one or multiple registers starting with REGNUM in
NEXT_FRAME's previous frame, starting at OFFSET, into BUF. If the register
contents are optimized out or unavailable, set *OPTIMIZEDP, *UNAVAILABLEP
accordingly. */
extern bool get_frame_register_bytes (const frame_info_ptr &next_frame,
int regnum, CORE_ADDR offset,
gdb::array_view buffer,
int *optimizedp, int *unavailablep);
/* Write bytes from BUFFER to one or multiple registers starting with REGNUM
in NEXT_FRAME's previous frame, starting at OFFSET. */
extern void put_frame_register_bytes (const frame_info_ptr &next_frame,
int regnum, CORE_ADDR offset,
gdb::array_view buffer);
/* Unwind the PC. Strictly speaking return the resume address of the
calling frame. For GDB, `pc' is the resume address and not a
specific register. */
extern CORE_ADDR frame_unwind_caller_pc (const frame_info_ptr &next_frame);
/* Discard the specified frame. Restoring the registers to the state
of the caller. */
extern void frame_pop (const frame_info_ptr &frame);
/* Return memory from the specified frame. A frame knows its thread /
LWP and hence can find its way down to a target. The assumption
here is that the current and previous frame share a common address
space.
If the memory read fails, these methods throw an error.
NOTE: cagney/2003-06-03: Should there be unwind versions of these
methods? That isn't clear. Can code, for instance, assume that
this and the previous frame's memory or architecture are identical?
If architecture / memory changes are always separated by special
adaptor frames this should be ok. */
extern void get_frame_memory (const frame_info_ptr &this_frame, CORE_ADDR addr,
gdb::array_view buffer);
extern LONGEST get_frame_memory_signed (const frame_info_ptr &this_frame,
CORE_ADDR memaddr, int len);
extern ULONGEST get_frame_memory_unsigned (const frame_info_ptr &this_frame,
CORE_ADDR memaddr, int len);
/* Same as above, but return true zero when the entire memory read
succeeds, false otherwise. */
extern bool safe_frame_unwind_memory (const frame_info_ptr &this_frame, CORE_ADDR addr,
gdb::array_view buffer);
/* Return this frame's architecture. */
extern gdbarch *get_frame_arch (const frame_info_ptr &this_frame);
/* Return the previous frame's architecture. */
extern gdbarch *frame_unwind_arch (const frame_info_ptr &next_frame);
/* Return the previous frame's architecture, skipping inline functions. */
extern gdbarch *frame_unwind_caller_arch (const frame_info_ptr &next_frame);
/* Values for the source flag to be used in print_frame_info ().
For all the cases below, the address is never printed if
'set print address' is off. When 'set print address' is on,
the address is printed if the program counter is not at the
beginning of the source line of the frame
and PRINT_WHAT is != LOC_AND_ADDRESS. */
enum print_what
{
/* Print only the address, source line, like in stepi. */
SRC_LINE = -1,
/* Print only the location, i.e. level, address,
function, args (as controlled by 'set print frame-arguments'),
file, line, line num. */
LOCATION,
/* Print both of the above. */
SRC_AND_LOC,
/* Print location only, print the address even if the program counter
is at the beginning of the source line. */
LOC_AND_ADDRESS,
/* Print only level and function,
i.e. location only, without address, file, line, line num. */
SHORT_LOCATION
};
/* Allocate zero initialized memory from the frame cache obstack.
Appendices to the frame info (such as the unwind cache) should
allocate memory using this method. */
extern void *frame_obstack_zalloc (unsigned long size);
#define FRAME_OBSTACK_ZALLOC(TYPE) \
((TYPE *) frame_obstack_zalloc (sizeof (TYPE)))
#define FRAME_OBSTACK_CALLOC(NUMBER,TYPE) \
((TYPE *) frame_obstack_zalloc ((NUMBER) * sizeof (TYPE)))
class readonly_detached_regcache;
/* Create a regcache, and copy the frame's registers into it. */
std::unique_ptr frame_save_as_regcache
(const frame_info_ptr &this_frame);
extern const struct block *get_frame_block (const frame_info_ptr &,
CORE_ADDR *addr_in_block);
/* Return the `struct block' that belongs to the selected thread's
selected frame. If the inferior has no state, return NULL.
NOTE: cagney/2002-11-29:
No state? Does the inferior have any execution state (a core file
does, an executable does not). At present the code tests
`target_has_stack' but I'm left wondering if it should test
`target_has_registers' or, even, a merged target_has_state.
Should it look at the most recently specified SAL? If the target
has no state, should this function try to extract a block from the
most recently selected SAL? That way `list foo' would give it some
sort of reference point. Then again, perhaps that would confuse
things.
Calls to this function can be broken down into two categories: Code
that uses the selected block as an additional, but optional, data
point; Code that uses the selected block as a prop, when it should
have the relevant frame/block/pc explicitly passed in.
The latter can be eliminated by correctly parameterizing the code,
the former though is more interesting. Per the "address" command,
it occurs in the CLI code and makes it possible for commands to
work, even when the inferior has no state. */
extern const struct block *get_selected_block (CORE_ADDR *addr_in_block);
extern struct symbol *get_frame_function (const frame_info_ptr &);
extern CORE_ADDR get_pc_function_start (CORE_ADDR);
extern frame_info_ptr find_relative_frame (frame_info_ptr, int *);
/* Wrapper over print_stack_frame modifying current_uiout with UIOUT for
the function call. */
extern void print_stack_frame_to_uiout (struct ui_out *uiout,
const frame_info_ptr &, int print_level,
enum print_what print_what,
int set_current_sal);
extern void print_stack_frame (const frame_info_ptr &, int print_level,
enum print_what print_what,
int set_current_sal);
extern void print_frame_info (const frame_print_options &fp_opts,
const frame_info_ptr &, int print_level,
enum print_what print_what, int args,
int set_current_sal);
extern frame_info_ptr block_innermost_frame (const struct block *);
extern bool deprecated_frame_register_read (const frame_info_ptr &frame, int regnum,
gdb_byte *buf);
/* From stack.c. */
/* The possible choices of "set print frame-arguments". */
extern const char print_frame_arguments_all[];
extern const char print_frame_arguments_scalars[];
extern const char print_frame_arguments_none[];
/* The possible choices of "set print frame-info". */
extern const char print_frame_info_auto[];
extern const char print_frame_info_source_line[];
extern const char print_frame_info_location[];
extern const char print_frame_info_source_and_location[];
extern const char print_frame_info_location_and_address[];
extern const char print_frame_info_short_location[];
/* The possible choices of "set print entry-values". */
extern const char print_entry_values_no[];
extern const char print_entry_values_only[];
extern const char print_entry_values_preferred[];
extern const char print_entry_values_if_needed[];
extern const char print_entry_values_both[];
extern const char print_entry_values_compact[];
extern const char print_entry_values_default[];
/* Data for the frame-printing "set print" settings exposed as command
options. */
struct frame_print_options
{
const char *print_frame_arguments = print_frame_arguments_scalars;
const char *print_frame_info = print_frame_info_auto;
const char *print_entry_values = print_entry_values_default;
/* If true, don't invoke pretty-printers for frame
arguments. */
bool print_raw_frame_arguments;
};
/* The values behind the global "set print ..." settings. */
extern frame_print_options user_frame_print_options;
/* Inferior function parameter value read in from a frame. */
struct frame_arg
{
/* Symbol for this parameter used for example for its name. */
struct symbol *sym = nullptr;
/* Value of the parameter. It is NULL if ERROR is not NULL; if both VAL and
ERROR are NULL this parameter's value should not be printed. */
struct value *val = nullptr;
/* String containing the error message, it is more usually NULL indicating no
error occurred reading this parameter. */
gdb::unique_xmalloc_ptr error;
/* One of the print_entry_values_* entries as appropriate specifically for
this frame_arg. It will be different from print_entry_values. With
print_entry_values_no this frame_arg should be printed as a normal
parameter. print_entry_values_only says it should be printed as entry
value parameter. print_entry_values_compact says it should be printed as
both as a normal parameter and entry values parameter having the same
value - print_entry_values_compact is not permitted fi ui_out_is_mi_like_p
(in such case print_entry_values_no and print_entry_values_only is used
for each parameter kind specifically. */
const char *entry_kind = nullptr;
};
extern void read_frame_arg (const frame_print_options &fp_opts,
symbol *sym, const frame_info_ptr &frame,
struct frame_arg *argp,
struct frame_arg *entryargp);
extern void read_frame_local (struct symbol *sym, const frame_info_ptr &frame,
struct frame_arg *argp);
extern void info_args_command (const char *, int);
extern void info_locals_command (const char *, int);
extern void return_command (const char *, int);
/* Set FRAME's unwinder temporarily, so that we can call a sniffer.
If sniffing fails, the caller should be sure to call
frame_cleanup_after_sniffer. */
extern void frame_prepare_for_sniffer (const frame_info_ptr &frame,
const struct frame_unwind *unwind);
/* Clean up after a failed (wrong unwinder) attempt to unwind past
FRAME. */
extern void frame_cleanup_after_sniffer (const frame_info_ptr &frame);
/* Notes (cagney/2002-11-27, drow/2003-09-06):
You might think that calls to this function can simply be replaced by a
call to get_selected_frame().
Unfortunately, it isn't that easy.
The relevant code needs to be audited to determine if it is
possible (or practical) to instead pass the applicable frame in as a
parameter. For instance, DEPRECATED_DO_REGISTERS_INFO() relied on
the deprecated_selected_frame global, while its replacement,
PRINT_REGISTERS_INFO(), is parameterized with the selected frame.
The only real exceptions occur at the edge (in the CLI code) where
user commands need to pick up the selected frame before proceeding.
There are also some functions called with a NULL frame meaning either "the
program is not running" or "use the selected frame".
This is important. GDB is trying to stamp out the hack:
saved_frame = deprecated_safe_get_selected_frame ();
select_frame (...);
hack_using_global_selected_frame ();
select_frame (saved_frame);
Take care!
This function calls get_selected_frame if the inferior should have a
frame, or returns NULL otherwise. */
extern frame_info_ptr deprecated_safe_get_selected_frame (void);
/* Create a frame using the specified BASE and PC. */
extern frame_info_ptr create_new_frame (CORE_ADDR base, CORE_ADDR pc);
/* Return true if the frame unwinder for frame FI is UNWINDER; false
otherwise. */
extern bool frame_unwinder_is (const frame_info_ptr &fi, const frame_unwind *unwinder);
/* Return the language of FRAME. */
extern enum language get_frame_language (const frame_info_ptr &frame);
/* Return the first non-tailcall frame above FRAME or FRAME if it is not a
tailcall frame. Return NULL if FRAME is the start of a tailcall-only
chain. */
extern frame_info_ptr skip_tailcall_frames (const frame_info_ptr &frame);
/* Return the first frame above FRAME or FRAME of which the code is
writable. */
extern frame_info_ptr skip_unwritable_frames (const frame_info_ptr &frame);
/* Data for the "set backtrace" settings. */
struct set_backtrace_options
{
/* Flag to indicate whether backtraces should continue past
main. */
bool backtrace_past_main = false;
/* Flag to indicate whether backtraces should continue past
entry. */
bool backtrace_past_entry = false;
/* Upper bound on the number of backtrace levels. Note this is not
exposed as a command option, because "backtrace" and "frame
apply" already have other means to set a frame count limit. */
unsigned int backtrace_limit = UINT_MAX;
};
/* The corresponding option definitions. */
extern const gdb::option::option_def set_backtrace_option_defs[2];
/* The values behind the global "set backtrace ..." settings. */
extern set_backtrace_options user_set_backtrace_options;
/* Get the number of calls to reinit_frame_cache. */
unsigned int get_frame_cache_generation ();
/* Mark that the PC value is masked for the previous frame. */
extern void set_frame_previous_pc_masked (const frame_info_ptr &frame);
/* Get whether the PC value is masked for the given frame. */
extern bool get_frame_pc_masked (const frame_info_ptr &frame);
#endif /* GDB_FRAME_H */