gdb/frame.h - gdb

Data types defined

Macros defined

Source code

  1. /* Definitions for dealing with stack frames, for GDB, the GNU debugger.

  3.    Copyright (C) 1986-2015 Free Software Foundation, Inc.

  5.    This file is part of GDB.

  7.    This program is free software; you can redistribute it and/or modify
  8.    it under the terms of the GNU General Public License as published by
  9.    the Free Software Foundation; either version 3 of the License, or
  10.    (at your option) any later version.

  12.    This program is distributed in the hope that it will be useful,
  13.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15.    GNU General Public License for more details.

  17.    You should have received a copy of the GNU General Public License
  18.    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

  20. #if !defined (FRAME_H)
  21. ‌#define FRAME_H 1

  23. /* The following is the intended naming schema for frame functions.
  24.    It isn't 100% consistent, but it is aproaching that.  Frame naming
  25.    schema:

  27.    Prefixes:

  29.    get_frame_WHAT...(): Get WHAT from the THIS frame (functionaly
  30.    equivalent to THIS->next->unwind->what)

  32.    frame_unwind_WHAT...(): Unwind THIS frame's WHAT from the NEXT
  33.    frame.

  35.    frame_unwind_caller_WHAT...(): Unwind WHAT for NEXT stack frame's
  36.    real caller.  Any inlined functions in NEXT's stack frame are
  37.    skipped.  Use these to ignore any potentially inlined functions,
  38.    e.g. inlined into the first instruction of a library trampoline.

  40.    get_stack_frame_WHAT...(): Get WHAT for THIS frame, but if THIS is
  41.    inlined, skip to the containing stack frame.

  43.    put_frame_WHAT...(): Put a value into this frame (unsafe, need to
  44.    invalidate the frame / regcache afterwards) (better name more
  45.    strongly hinting at its unsafeness)

  47.    safe_....(): Safer version of various functions, doesn't throw an
  48.    error (leave this for later?).  Returns non-zero / non-NULL if the
  49.    request succeeds, zero / NULL otherwize.

  51.    Suffixes:

  53.    void /frame/_WHAT(): Read WHAT's value into the buffer parameter.

  55.    ULONGEST /frame/_WHAT_unsigned(): Return an unsigned value (the
  56.    alternative is *frame_unsigned_WHAT).

  58.    LONGEST /frame/_WHAT_signed(): Return WHAT signed value.

  60.    What:

  62.    /frame/_memory* (frame, coreaddr, len [, buf]): Extract/return
  63.    *memory.

  65.    /frame/_register* (frame, regnum [, buf]): extract/return register.

  67.    CORE_ADDR /frame/_{pc,sp,...} (frame): Resume address, innner most
  68.    stack *address, ...

  70.    */

  72. struct symtab_and_line;
  73. struct frame_unwind;
  74. struct frame_base;
  75. struct block;
  76. struct gdbarch;
  77. struct ui_file;

  79. /* Status of a given frame's stack.  */

  81. ‌enum frame_id_stack_status
  82. {
  83.   /* Stack address is invalid.  E.g., this frame is the outermost
  84.      (i.e., _start), and the stack hasn't been setup yet.  */
  85.   FID_STACK_INVALID = 0,

  87.   /* Stack address is valid, and is found in the stack_addr field.  */
  88.   FID_STACK_VALID = 1,

  90.   /* Stack address is unavailable.  I.e., there's a valid stack, but
  91.      we don't know where it is (because memory or registers we'd
  92.      compute it from were not collected).  */
  93.   FID_STACK_UNAVAILABLE = -1
  94. };

  96. /* The frame object.  */

  98. struct frame_info;

  100. /* The frame object's ID.  This provides a per-frame unique identifier
  101.    that can be used to relocate a `struct frame_info' after a target
  102.    resume or a frame cache destruct.  It of course assumes that the
  103.    inferior hasn't unwound the stack past that frame.  */

  105. ‌struct frame_id
  106. {
  107.   /* The frame's stack address.  This shall be constant through out
  108.      the lifetime of a frame.  Note that this requirement applies to
  109.      not just the function body, but also the prologue and (in theory
  110.      at least) the epilogue.  Since that value needs to fall either on
  111.      the boundary, or within the frame's address range, the frame's
  112.      outer-most address (the inner-most address of the previous frame)
  113.      is used.  Watch out for all the legacy targets that still use the
  114.      function pointer register or stack pointer register.  They are
  115.      wrong.

  117.      This field is valid only if frame_id.stack_status is
  118.      FID_STACK_VALID.  It will be 0 for other
  119.      FID_STACK_... statuses.  */
  120.   CORE_ADDR stack_addr;

  122.   /* The frame's code address.  This shall be constant through out the
  123.      lifetime of the frame.  While the PC (a.k.a. resume address)
  124.      changes as the function is executed, this code address cannot.
  125.      Typically, it is set to the address of the entry point of the
  126.      frame's function (as returned by get_frame_func).

  128.      For inlined functions (INLINE_DEPTH != 0), this is the address of
  129.      the first executed instruction in the block corresponding to the
  130.      inlined function.

  132.      This field is valid only if code_addr_p is true.  Otherwise, this
  133.      frame is considered to have a wildcard code address, i.e. one that
  134.      matches every address value in frame comparisons.  */
  135.   CORE_ADDR code_addr;

  137.   /* The frame's special address.  This shall be constant through out the
  138.      lifetime of the frame.  This is used for architectures that may have
  139.      frames that do not change the stack but are still distinct and have
  140.      some form of distinct identifier (e.g. the ia64 which uses a 2nd
  141.      stack for registers).  This field is treated as unordered - i.e. will
  142.      not be used in frame ordering comparisons.

  144.      This field is valid only if special_addr_p is true.  Otherwise, this
  145.      frame is considered to have a wildcard special address, i.e. one that
  146.      matches every address value in frame comparisons.  */
  147.   CORE_ADDR special_addr;

  149.   /* Flags to indicate the above fields have valid contents.  */
  150.   ENUM_BITFIELD(frame_id_stack_status) stack_status : 2;
  151.   unsigned int code_addr_p : 1;
  152.   unsigned int special_addr_p : 1;

  154.   /* It is non-zero for a frame made up by GDB without stack data
  155.      representation in inferior, such as INLINE_FRAME or TAILCALL_FRAME.
  156.      Caller of inlined function will have it zero, each more inner called frame
  157.      will have it increasingly one, two etc.  Similarly for TAILCALL_FRAME.  */
  158.   int artificial_depth;
  159. };

  161. /* Methods for constructing and comparing Frame IDs.  */

  163. /* For convenience.  All fields are zero.  This means "there is no frame".  */
  164. extern const struct frame_id null_frame_id;

  166. /* This means "there is no frame ID, but there is a frame".  It should be
  167.    replaced by best-effort frame IDs for the outermost frame, somehow.
  168.    The implementation is only special_addr_p set.  */
  169. extern const struct frame_id outer_frame_id;

  171. /* Flag to control debugging.  */

  173. extern unsigned int frame_debug;

  175. /* Construct a frame ID.  The first parameter is the frame's constant
  176.    stack address (typically the outer-bound), and the second the
  177.    frame's constant code address (typically the entry point).
  178.    The special identifier address is set to indicate a wild card.  */
  179. extern struct frame_id frame_id_build (CORE_ADDR stack_addr,
  180.                                        CORE_ADDR code_addr);

  182. /* Construct a special frame ID.  The first parameter is the frame's constant
  183.    stack address (typically the outer-bound), the second is the
  184.    frame's constant code address (typically the entry point),
  185.    and the third parameter is the frame's special identifier address.  */
  186. extern struct frame_id frame_id_build_special (CORE_ADDR stack_addr,
  187.                                                CORE_ADDR code_addr,
  188.                                                CORE_ADDR special_addr);

  190. /* Construct a frame ID representing a frame where the stack address
  191.    exists, but is unavailable.  CODE_ADDR is the frame's constant code
  192.    address (typically the entry point).  The special identifier
  193.    address is set to indicate a wild card.  */
  194. extern struct frame_id frame_id_build_unavailable_stack (CORE_ADDR code_addr);

  196. /* Construct a frame ID representing a frame where the stack address
  197.    exists, but is unavailable.  CODE_ADDR is the frame's constant code
  198.    address (typically the entry point).  SPECIAL_ADDR is the special
  199.    identifier address.  */
  200. extern struct frame_id
  201.   frame_id_build_unavailable_stack_special (CORE_ADDR code_addr,
  202.                                             CORE_ADDR special_addr);

  204. /* Construct a wild card frame ID.  The parameter is the frame's constant
  205.    stack address (typically the outer-bound).  The code address as well
  206.    as the special identifier address are set to indicate wild cards.  */
  207. extern struct frame_id frame_id_build_wild (CORE_ADDR stack_addr);

  209. /* Returns non-zero when L is a valid frame (a valid frame has a
  210.    non-zero .base).  The outermost frame is valid even without an
  211.    ID.  */
  212. extern int frame_id_p (struct frame_id l);

  214. /* Returns non-zero when L is a valid frame representing a frame made up by GDB
  215.    without stack data representation in inferior, such as INLINE_FRAME or
  216.    TAILCALL_FRAME.  */
  217. extern int frame_id_artificial_p (struct frame_id l);

  219. /* Returns non-zero when L and R identify the same frame, or, if
  220.    either L or R have a zero .func, then the same frame base.  */
  221. extern int frame_id_eq (struct frame_id l, struct frame_id r);

  223. /* Write the internal representation of a frame ID on the specified
  224.    stream.  */
  225. extern void fprint_frame_id (struct ui_file *file, struct frame_id id);


  228. /* Frame types.  Some are real, some are signal trampolines, and some
  229.    are completely artificial (dummy).  */

  231. ‌enum frame_type
  232. {
  233.   /* A true stack frame, created by the target program during normal
  234.      execution.  */
  235.   NORMAL_FRAME,
  236.   /* A fake frame, created by GDB when performing an inferior function
  237.      call.  */
  238.   DUMMY_FRAME,
  239.   /* A frame representing an inlined function, associated with an
  240.      upcoming (prev, outer, older) NORMAL_FRAME.  */
  241.   INLINE_FRAME,
  242.   /* A virtual frame of a tail call - see dwarf2_tailcall_frame_unwind.  */
  243.   TAILCALL_FRAME,
  244.   /* In a signal handler, various OSs handle this in various ways.
  245.      The main thing is that the frame may be far from normal.  */
  246.   SIGTRAMP_FRAME,
  247.   /* Fake frame representing a cross-architecture call.  */
  248.   ARCH_FRAME,
  249.   /* Sentinel or registers frame.  This frame obtains register values
  250.      direct from the inferior's registers.  */
  251.   SENTINEL_FRAME
  252. };

  254. /* For every stopped thread, GDB tracks two frames: current and
  255.    selected.  Current frame is the inner most frame of the selected
  256.    thread.  Selected frame is the one being examined by the GDB
  257.    CLI (selected using `up', `down', ...).  The frames are created
  258.    on-demand (via get_prev_frame()) and then held in a frame cache.  */
  259. /* FIXME: cagney/2002-11-28: Er, there is a lie here.  If you do the
  260.    sequence: `thread 1; up; thread 2; thread 1' you lose thread 1's
  261.    selected frame.  At present GDB only tracks the selected frame of
  262.    the current thread.  But be warned, that might change.  */
  263. /* FIXME: cagney/2002-11-14: At any time, only one thread's selected
  264.    and current frame can be active.  Switching threads causes gdb to
  265.    discard all that cached frame information.  Ulgh!  Instead, current
  266.    and selected frame should be bound to a thread.  */

  268. /* On demand, create the inner most frame using information found in
  269.    the inferior.  If the inner most frame can't be created, throw an
  270.    error.  */
  271. extern struct frame_info *get_current_frame (void);

  273. /* Does the current target interface have enough state to be able to
  274.    query the current inferior for frame info, and is the inferior in a
  275.    state where that is possible?  */
  276. extern int has_stack_frames (void);

  278. /* Invalidates the frame cache (this function should have been called
  279.    invalidate_cached_frames).

  281.    FIXME: cagney/2002-11-28: There should be two methods: one that
  282.    reverts the thread's selected frame back to current frame (for when
  283.    the inferior resumes) and one that does not (for when the user
  284.    modifies the target invalidating the frame cache).  */
  285. extern void reinit_frame_cache (void);

  287. /* On demand, create the selected frame and then return it.  If the
  288.    selected frame can not be created, this function prints then throws
  289.    an error.  When MESSAGE is non-NULL, use it for the error message,
  290.    otherwize use a generic error message.  */
  291. /* FIXME: cagney/2002-11-28: At present, when there is no selected
  292.    frame, this function always returns the current (inner most) frame.
  293.    It should instead, when a thread has previously had its frame
  294.    selected (but not resumed) and the frame cache invalidated, find
  295.    and then return that thread's previously selected frame.  */
  296. extern struct frame_info *get_selected_frame (const char *message);

  298. /* If there is a selected frame, return it.  Otherwise, return NULL.  */
  299. extern struct frame_info *get_selected_frame_if_set (void);

  301. /* Select a specific frame.  NULL, apparently implies re-select the
  302.    inner most frame.  */
  303. extern void select_frame (struct frame_info *);

  305. /* Given a FRAME, return the next (more inner, younger) or previous
  306.    (more outer, older) frame.  */
  307. extern struct frame_info *get_prev_frame (struct frame_info *);
  308. extern struct frame_info *get_next_frame (struct frame_info *);

  310. /* Return a "struct frame_info" corresponding to the frame that called
  311.    THIS_FRAME.  Returns NULL if there is no such frame.

  313.    Unlike get_prev_frame, this function always tries to unwind the
  314.    frame.  */
  315. extern struct frame_info *get_prev_frame_always (struct frame_info *);

  317. /* Given a frame's ID, relocate the frame.  Returns NULL if the frame
  318.    is not found.  */
  319. extern struct frame_info *frame_find_by_id (struct frame_id id);

  321. /* Base attributes of a frame: */

  323. /* The frame's `resume' address.  Where the program will resume in
  324.    this frame.

  326.    This replaced: frame->pc; */
  327. extern CORE_ADDR get_frame_pc (struct frame_info *);

  329. /* Same as get_frame_pc, but return a boolean indication of whether
  330.    the PC is actually available, instead of throwing an error.  */

  332. extern int get_frame_pc_if_available (struct frame_info *frame,
  333.                                       CORE_ADDR *pc);

  335. /* An address (not necessarily aligned to an instruction boundary)
  336.    that falls within THIS frame's code block.

  338.    When a function call is the last statement in a block, the return
  339.    address for the call may land at the start of the next block.
  340.    Similarly, if a no-return function call is the last statement in
  341.    the function, the return address may end up pointing beyond the
  342.    function, and possibly at the start of the next function.

  344.    These methods make an allowance for this.  For call frames, this
  345.    function returns the frame's PC-1 which "should" be an address in
  346.    the frame's block.  */

  348. extern CORE_ADDR get_frame_address_in_block (struct frame_info *this_frame);

  350. /* Same as get_frame_address_in_block, but returns a boolean
  351.    indication of whether the frame address is determinable (when the
  352.    PC is unavailable, it will not be), instead of possibly throwing an
  353.    error trying to read an unavailable PC.  */

  355. extern int
  356.   get_frame_address_in_block_if_available (struct frame_info *this_frame,
  357.                                            CORE_ADDR *pc);

  359. /* The frame's inner-most bound.  AKA the stack-pointer.  Confusingly
  360.    known as top-of-stack.  */

  362. extern CORE_ADDR get_frame_sp (struct frame_info *);

  364. /* Following on from the `resume' address.  Return the entry point
  365.    address of the function containing that resume address, or zero if
  366.    that function isn't known.  */
  367. extern CORE_ADDR get_frame_func (struct frame_info *fi);

  369. /* Same as get_frame_func, but returns a boolean indication of whether
  370.    the frame function is determinable (when the PC is unavailable, it
  371.    will not be), instead of possibly throwing an error trying to read
  372.    an unavailable PC.  */

  374. extern int get_frame_func_if_available (struct frame_info *fi, CORE_ADDR *);

  376. /* Closely related to the resume address, various symbol table
  377.    attributes that are determined by the PC.  Note that for a normal
  378.    frame, the PC refers to the resume address after the return, and
  379.    not the call instruction.  In such a case, the address is adjusted
  380.    so that it (approximately) identifies the call site (and not the
  381.    return site).

  383.    NOTE: cagney/2002-11-28: The frame cache could be used to cache the
  384.    computed value.  Working on the assumption that the bottle-neck is
  385.    in the single step code, and that code causes the frame cache to be
  386.    constantly flushed, caching things in a frame is probably of little
  387.    benefit.  As they say `show us the numbers'.

  389.    NOTE: cagney/2002-11-28: Plenty more where this one came from:
  390.    find_frame_block(), find_frame_partial_function(),
  391.    find_frame_symtab(), find_frame_function().  Each will need to be
  392.    carefully considered to determine if the real intent was for it to
  393.    apply to the PC or the adjusted PC.  */
  394. extern void find_frame_sal (struct frame_info *frame,
  395.                             struct symtab_and_line *sal);

  397. /* Set the current source and line to the location given by frame
  398.    FRAME, if possible.  */

  400. void set_current_sal_from_frame (struct frame_info *);

  402. /* Return the frame base (what ever that is) (DEPRECATED).

  404.    Old code was trying to use this single method for two conflicting
  405.    purposes.  Such code needs to be updated to use either of:

  407.    get_frame_id: A low level frame unique identifier, that consists of
  408.    both a stack and a function address, that can be used to uniquely
  409.    identify a frame.  This value is determined by the frame's
  410.    low-level unwinder, the stack part [typically] being the
  411.    top-of-stack of the previous frame, and the function part being the
  412.    function's start address.  Since the correct identification of a
  413.    frameless function requires both a stack and function address,
  414.    the old get_frame_base method was not sufficient.

  416.    get_frame_base_address: get_frame_locals_address:
  417.    get_frame_args_address: A set of high-level debug-info dependant
  418.    addresses that fall within the frame.  These addresses almost
  419.    certainly will not match the stack address part of a frame ID (as
  420.    returned by get_frame_base).

  422.    This replaced: frame->frame; */

  424. extern CORE_ADDR get_frame_base (struct frame_info *);

  426. /* Return the per-frame unique identifer.  Can be used to relocate a
  427.    frame after a frame cache flush (and other similar operations).  If
  428.    FI is NULL, return the null_frame_id.

  430.    NOTE: kettenis/20040508: These functions return a structure.  On
  431.    platforms where structures are returned in static storage (vax,
  432.    m68k), this may trigger compiler bugs in code like:

  434.    if (frame_id_eq (get_frame_id (l), get_frame_id (r)))

  436.    where the return value from the first get_frame_id (l) gets
  437.    overwritten by the second get_frame_id (r).  Please avoid writing
  438.    code like this.  Use code like:

  440.    struct frame_id id = get_frame_id (l);
  441.    if (frame_id_eq (id, get_frame_id (r)))

  443.    instead, since that avoids the bug.  */
  444. extern struct frame_id get_frame_id (struct frame_info *fi);
  445. extern struct frame_id get_stack_frame_id (struct frame_info *fi);
  446. extern struct frame_id frame_unwind_caller_id (struct frame_info *next_frame);

  448. /* Assuming that a frame is `normal', return its base-address, or 0 if
  449.    the information isn't available.  NOTE: This address is really only
  450.    meaningful to the frame's high-level debug info.  */
  451. extern CORE_ADDR get_frame_base_address (struct frame_info *);

  453. /* Assuming that a frame is `normal', return the base-address of the
  454.    local variables, or 0 if the information isn't available.  NOTE:
  455.    This address is really only meaningful to the frame's high-level
  456.    debug info.  Typically, the argument and locals share a single
  457.    base-address.  */
  458. extern CORE_ADDR get_frame_locals_address (struct frame_info *);

  460. /* Assuming that a frame is `normal', return the base-address of the
  461.    parameter list, or 0 if that information isn't available.  NOTE:
  462.    This address is really only meaningful to the frame's high-level
  463.    debug info.  Typically, the argument and locals share a single
  464.    base-address.  */
  465. extern CORE_ADDR get_frame_args_address (struct frame_info *);

  467. /* The frame's level: 0 for innermost, 1 for its caller, ...; or -1
  468.    for an invalid frame).  */
  469. extern int frame_relative_level (struct frame_info *fi);

  471. /* Return the frame's type.  */

  473. extern enum frame_type get_frame_type (struct frame_info *);

  475. /* Return the frame's program space.  */
  476. extern struct program_space *get_frame_program_space (struct frame_info *);

  478. /* Unwind THIS frame's program space from the NEXT frame.  */
  479. extern struct program_space *frame_unwind_program_space (struct frame_info *);

  481. /* Return the frame's address space.  */
  482. extern struct address_space *get_frame_address_space (struct frame_info *);

  484. /* For frames where we can not unwind further, describe why.  */

  486. ‌enum unwind_stop_reason
  487.   {
  488. ‌#define SET(name, description) name,
  489. ‌#define FIRST_ENTRY(name) UNWIND_FIRST = name,
  490. ‌#define LAST_ENTRY(name) UNWIND_LAST = name,
  491. ‌#define FIRST_ERROR(name) UNWIND_FIRST_ERROR = name,

  493. #include "unwind_stop_reasons.def"
  494. ‌#undef SET
  495. ‌#undef FIRST_ENTRY
  496. ‌#undef LAST_ENTRY
  497. ‌#undef FIRST_ERROR
  498.   };

  500. /* Return the reason why we can't unwind past this frame.  */

  502. enum unwind_stop_reason get_frame_unwind_stop_reason (struct frame_info *);

  504. /* Translate a reason code to an informative string.  This converts the
  505.    generic stop reason codes into a generic string describing the code.
  506.    For a possibly frame specific string explaining the stop reason, use
  507.    FRAME_STOP_REASON_STRING instead.  */

  509. const char *unwind_stop_reason_to_string (enum unwind_stop_reason);

  511. /* Return a possibly frame specific string explaining why the unwind
  512.    stopped here.  E.g., if unwinding tripped on a memory error, this
  513.    will return the error description string, which includes the address
  514.    that we failed to access.  If there's no specific reason stored for
  515.    a frame then a generic reason string will be returned.

  517.    Should only be called for frames that don't have a previous frame.  */

  519. const char *frame_stop_reason_string (struct frame_info *);

  521. /* Unwind the stack frame so that the value of REGNUM, in the previous
  522.    (up, older) frame is returned.  If VALUEP is NULL, don't
  523.    fetch/compute the value.  Instead just return the location of the
  524.    value.  */
  525. extern void frame_register_unwind (struct frame_info *frame, int regnum,
  526.                                    int *optimizedp, int *unavailablep,
  527.                                    enum lval_type *lvalp,
  528.                                    CORE_ADDR *addrp, int *realnump,
  529.                                    gdb_byte *valuep);

  531. /* Fetch a register from this, or unwind a register from the next
  532.    frame.  Note that the get_frame methods are wrappers to
  533.    frame->next->unwind.  They all [potentially] throw an error if the
  534.    fetch fails.  The value methods never return NULL, but usually
  535.    do return a lazy value.  */

  537. extern void frame_unwind_register (struct frame_info *frame,
  538.                                    int regnum, gdb_byte *buf);
  539. extern void get_frame_register (struct frame_info *frame,
  540.                                 int regnum, gdb_byte *buf);

  542. struct value *frame_unwind_register_value (struct frame_info *frame,
  543.                                            int regnum);
  544. struct value *get_frame_register_value (struct frame_info *frame,
  545.                                         int regnum);

  547. extern LONGEST frame_unwind_register_signed (struct frame_info *frame,
  548.                                              int regnum);
  549. extern LONGEST get_frame_register_signed (struct frame_info *frame,
  550.                                           int regnum);
  551. extern ULONGEST frame_unwind_register_unsigned (struct frame_info *frame,
  552.                                                int regnum);
  553. extern ULONGEST get_frame_register_unsigned (struct frame_info *frame,
  554.                                              int regnum);

  556. /* Read a register from this, or unwind a register from the next
  557.    frame.  Note that the read_frame methods are wrappers to
  558.    get_frame_register_value, that do not throw if the result is
  559.    optimized out or unavailable.  */

  561. extern int read_frame_register_unsigned (struct frame_info *frame,
  562.                                          int regnum, ULONGEST *val);

  564. /* Get the value of the register that belongs to this FRAME.  This
  565.    function is a wrapper to the call sequence ``frame_register_unwind
  566.    (get_next_frame (FRAME))''.  As per frame_register_unwind(), if
  567.    VALUEP is NULL, the registers value is not fetched/computed.  */

  569. extern void frame_register (struct frame_info *frame, int regnum,
  570.                             int *optimizedp, int *unavailablep,
  571.                             enum lval_type *lvalp,
  572.                             CORE_ADDR *addrp, int *realnump,
  573.                             gdb_byte *valuep);

  575. /* The reverse.  Store a register value relative to the specified
  576.    frame.  Note: this call makes the frame's state undefined.  The
  577.    register and frame caches must be flushed.  */
  578. extern void put_frame_register (struct frame_info *frame, int regnum,
  579.                                 const gdb_byte *buf);

  581. /* Read LEN bytes from one or multiple registers starting with REGNUM
  582.    in frame FRAME, starting at OFFSET, into BUF.  If the register
  583.    contents are optimized out or unavailable, set *OPTIMIZEDP,
  584.    *UNAVAILABLEP accordingly.  */
  585. extern int get_frame_register_bytes (struct frame_info *frame, int regnum,
  586.                                      CORE_ADDR offset, int len,
  587.                                      gdb_byte *myaddr,
  588.                                      int *optimizedp, int *unavailablep);

  590. /* Write LEN bytes to one or multiple registers starting with REGNUM
  591.    in frame FRAME, starting at OFFSET, into BUF.  */
  592. extern void put_frame_register_bytes (struct frame_info *frame, int regnum,
  593.                                       CORE_ADDR offset, int len,
  594.                                       const gdb_byte *myaddr);

  596. /* Unwind the PC.  Strictly speaking return the resume address of the
  597.    calling frame.  For GDB, `pc' is the resume address and not a
  598.    specific register.  */

  600. extern CORE_ADDR frame_unwind_caller_pc (struct frame_info *frame);

  602. /* Discard the specified frame.  Restoring the registers to the state
  603.    of the caller.  */
  604. extern void frame_pop (struct frame_info *frame);

  606. /* Return memory from the specified frame.  A frame knows its thread /
  607.    LWP and hence can find its way down to a target.  The assumption
  608.    here is that the current and previous frame share a common address
  609.    space.

  611.    If the memory read fails, these methods throw an error.

  613.    NOTE: cagney/2003-06-03: Should there be unwind versions of these
  614.    methods?  That isn't clear.  Can code, for instance, assume that
  615.    this and the previous frame's memory or architecture are identical?
  616.    If architecture / memory changes are always separated by special
  617.    adaptor frames this should be ok.  */

  619. extern void get_frame_memory (struct frame_info *this_frame, CORE_ADDR addr,
  620.                               gdb_byte *buf, int len);
  621. extern LONGEST get_frame_memory_signed (struct frame_info *this_frame,
  622.                                         CORE_ADDR memaddr, int len);
  623. extern ULONGEST get_frame_memory_unsigned (struct frame_info *this_frame,
  624.                                            CORE_ADDR memaddr, int len);

  626. /* Same as above, but return non-zero when the entire memory read
  627.    succeeds, zero otherwize.  */
  628. extern int safe_frame_unwind_memory (struct frame_info *this_frame,
  629.                                      CORE_ADDR addr, gdb_byte *buf, int len);

  631. /* Return this frame's architecture.  */
  632. extern struct gdbarch *get_frame_arch (struct frame_info *this_frame);

  634. /* Return the previous frame's architecture.  */
  635. extern struct gdbarch *frame_unwind_arch (struct frame_info *frame);

  637. /* Return the previous frame's architecture, skipping inline functions.  */
  638. extern struct gdbarch *frame_unwind_caller_arch (struct frame_info *frame);


  641. /* Values for the source flag to be used in print_frame_info_base().  */
  642. ‌enum print_what
  643.   {
  644.     /* Print only the source line, like in stepi.  */
  645.     SRC_LINE = -1,
  646.     /* Print only the location, i.e. level, address (sometimes)
  647.        function, args, file, line, line num.  */
  648.     LOCATION,
  649.     /* Print both of the above.  */
  650.     SRC_AND_LOC,
  651.     /* Print location only, but always include the address.  */
  652.     LOC_AND_ADDRESS
  653.   };

  655. /* Allocate zero initialized memory from the frame cache obstack.
  656.    Appendices to the frame info (such as the unwind cache) should
  657.    allocate memory using this method.  */

  659. extern void *frame_obstack_zalloc (unsigned long size);
  660. ‌#define FRAME_OBSTACK_ZALLOC(TYPE) \
  661.   ((TYPE *) frame_obstack_zalloc (sizeof (TYPE)))
  662. ‌#define FRAME_OBSTACK_CALLOC(NUMBER,TYPE) \
  663.   ((TYPE *) frame_obstack_zalloc ((NUMBER) * sizeof (TYPE)))

  665. /* Create a regcache, and copy the frame's registers into it.  */
  666. struct regcache *frame_save_as_regcache (struct frame_info *this_frame);

  668. extern const struct block *get_frame_block (struct frame_info *,
  669.                                             CORE_ADDR *addr_in_block);

  671. /* Return the `struct block' that belongs to the selected thread's
  672.    selected frame.  If the inferior has no state, return NULL.

  674.    NOTE: cagney/2002-11-29:

  676.    No state?  Does the inferior have any execution state (a core file
  677.    does, an executable does not).  At present the code tests
  678.    `target_has_stack' but I'm left wondering if it should test
  679.    `target_has_registers' or, even, a merged target_has_state.

  681.    Should it look at the most recently specified SAL?  If the target
  682.    has no state, should this function try to extract a block from the
  683.    most recently selected SAL?  That way `list foo' would give it some
  684.    sort of reference point.  Then again, perhaps that would confuse
  685.    things.

  687.    Calls to this function can be broken down into two categories: Code
  688.    that uses the selected block as an additional, but optional, data
  689.    point; Code that uses the selected block as a prop, when it should
  690.    have the relevant frame/block/pc explicitly passed in.

  692.    The latter can be eliminated by correctly parameterizing the code,
  693.    the former though is more interesting.  Per the "address" command,
  694.    it occurs in the CLI code and makes it possible for commands to
  695.    work, even when the inferior has no state.  */

  697. extern const struct block *get_selected_block (CORE_ADDR *addr_in_block);

  699. extern struct symbol *get_frame_function (struct frame_info *);

  701. extern CORE_ADDR get_pc_function_start (CORE_ADDR);

  703. extern struct frame_info *find_relative_frame (struct frame_info *, int *);

  705. extern void print_stack_frame (struct frame_info *, int print_level,
  706.                                enum print_what print_what,
  707.                                int set_current_sal);

  709. extern void print_frame_info (struct frame_info *, int print_level,
  710.                               enum print_what print_what, int args,
  711.                               int set_current_sal);

  713. extern struct frame_info *block_innermost_frame (const struct block *);

  715. extern int deprecated_frame_register_read (struct frame_info *frame, int regnum,
  716.                                 gdb_byte *buf);

  718. /* From stack.c.  */

  720. extern const char print_entry_values_no[];
  721. extern const char print_entry_values_only[];
  722. extern const char print_entry_values_preferred[];
  723. extern const char print_entry_values_if_needed[];
  724. extern const char print_entry_values_both[];
  725. extern const char print_entry_values_compact[];
  726. extern const char print_entry_values_default[];
  727. extern const char *print_entry_values;

  729. /* Inferior function parameter value read in from a frame.  */

  731. ‌struct frame_arg
  732. {
  733.   /* Symbol for this parameter used for example for its name.  */
  734.   struct symbol *sym;

  736.   /* Value of the parameter.  It is NULL if ERROR is not NULL; if both VAL and
  737.      ERROR are NULL this parameter's value should not be printed.  */
  738.   struct value *val;

  740.   /* String containing the error message, it is more usually NULL indicating no
  741.      error occured reading this parameter.  */
  742.   char *error;

  744.   /* One of the print_entry_values_* entries as appropriate specifically for
  745.      this frame_arg.  It will be different from print_entry_values.  With
  746.      print_entry_values_no this frame_arg should be printed as a normal
  747.      parameter.  print_entry_values_only says it should be printed as entry
  748.      value parameter.  print_entry_values_compact says it should be printed as
  749.      both as a normal parameter and entry values parameter having the same
  750.      value - print_entry_values_compact is not permitted fi ui_out_is_mi_like_p
  751.      (in such case print_entry_values_no and print_entry_values_only is used
  752.      for each parameter kind specifically.  */
  753.   const char *entry_kind;
  754. };

  756. extern void read_frame_arg (struct symbol *sym, struct frame_info *frame,
  757.                             struct frame_arg *argp,
  758.                             struct frame_arg *entryargp);
  759. extern void read_frame_local (struct symbol *sym, struct frame_info *frame,
  760.                               struct frame_arg *argp);

  762. extern void args_info (char *, int);

  764. extern void locals_info (char *, int);

  766. extern void (*deprecated_selected_frame_level_changed_hook) (int);

  768. extern void return_command (char *, int);

  770. /* Set FRAME's unwinder temporarily, so that we can call a sniffer.
  771.    Return a cleanup which should be called if unwinding fails, and
  772.    discarded if it succeeds.  */

  774. struct cleanup *frame_prepare_for_sniffer (struct frame_info *frame,
  775.                                            const struct frame_unwind *unwind);

  777. /* Notes (cagney/2002-11-27, drow/2003-09-06):

  779.    You might think that calls to this function can simply be replaced by a
  780.    call to get_selected_frame().

  782.    Unfortunately, it isn't that easy.

  784.    The relevant code needs to be audited to determine if it is
  785.    possible (or practical) to instead pass the applicable frame in as a
  786.    parameter.  For instance, DEPRECATED_DO_REGISTERS_INFO() relied on
  787.    the deprecated_selected_frame global, while its replacement,
  788.    PRINT_REGISTERS_INFO(), is parameterized with the selected frame.
  789.    The only real exceptions occur at the edge (in the CLI code) where
  790.    user commands need to pick up the selected frame before proceeding.

  792.    There are also some functions called with a NULL frame meaning either "the
  793.    program is not running" or "use the selected frame".

  795.    This is important.  GDB is trying to stamp out the hack:

  797.    saved_frame = deprecated_safe_get_selected_frame ();
  798.    select_frame (...);
  799.    hack_using_global_selected_frame ();
  800.    select_frame (saved_frame);

  802.    Take care!

  804.    This function calls get_selected_frame if the inferior should have a
  805.    frame, or returns NULL otherwise.  */

  807. extern struct frame_info *deprecated_safe_get_selected_frame (void);

  809. /* Create a frame using the specified BASE and PC.  */

  811. extern struct frame_info *create_new_frame (CORE_ADDR base, CORE_ADDR pc);

  813. /* Return true if the frame unwinder for frame FI is UNWINDER; false
  814.    otherwise.  */

  816. extern int frame_unwinder_is (struct frame_info *fi,
  817.                               const struct frame_unwind *unwinder);

  819. #endif /* !defined (FRAME_H)  */