gdb/frame.h

   1 /* Definitions for dealing with stack frames, for GDB, the GNU debugger.
   2
   3    Copyright 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1996,
   4    1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #if !defined (FRAME_H)
  24 #define FRAME_H 1
  25
  26 struct symtab_and_line;
  27 struct frame_unwind;
  28 struct block;
  29
  30 /* A legacy unwinder to prop up architectures using the old style
  31    saved regs array.  */
  32 extern const struct frame_unwind *legacy_saved_regs_unwind;
  33
  34 /* The frame object.  */
  35
  36 struct frame_info;
  37
  38 /* The frame object's ID.  This provides a per-frame unique identifier
  39    that can be used to relocate a `struct frame_info' after a target
  40    resume or a frame cache destruct.  It of course assumes that the
  41    inferior hasn't unwound the stack past that frame.  */
  42
  43 struct frame_id
  44 {
  45   /* The frame's address.  This should be constant through out the
  46      lifetime of a frame.  */
  47   /* NOTE: cagney/2002-11-16: The ia64 has two stacks and hence two
  48      frame bases.  This will need to be expanded to accomodate that.  */
  49   CORE_ADDR base;
  50   /* The frame's current PC.  While the PC within the function may
  51      change, the function that contains the PC does not.  Should this
  52      instead be the frame's function?  */
  53   CORE_ADDR pc;
  54 };
  55
  56 /* Methods for constructing and comparing Frame IDs.
  57
  58    NOTE: Given frameless functions A and B, where A calls B (and hence
  59    B is inner-to A).  The relationships: !eq(A,B); !eq(B,A);
  60    !inner(A,B); !inner(B,A); all hold.  This is because, while B is
  61    inner to A, B is not strictly inner to A (being frameless, they
  62    have the same .base value).  */
  63
  64 /* For convenience.  All fields are zero.  */
  65 extern const struct frame_id null_frame_id;
  66
  67 /* Construct a frame ID.  The second parameter isn't yet well defined.
  68    It might be the containing function, or the resume PC (see comment
  69    above in `struct frame_id')?  A func/pc of zero indicates a
  70    wildcard (i.e., do not use func in frame ID comparisons).  */
  71 extern struct frame_id frame_id_build (CORE_ADDR base,
  72                                        CORE_ADDR func_or_pc);
  73
  74 /* Returns non-zero when L is a valid frame (a valid frame has a
  75    non-zero .base).  */
  76 extern int frame_id_p (struct frame_id l);
  77
  78 /* Returns non-zero when L and R identify the same frame, or, if
  79    either L or R have a zero .func, then the same frame base.  */
  80 extern int frame_id_eq (struct frame_id l, struct frame_id r);
  81
  82 /* Returns non-zero when L is strictly inner-than R (they have
  83    different frame .bases).  Neither L, nor R can be `null'.  See note
  84    above about frameless functions.  */
  85 extern int frame_id_inner (struct frame_id l, struct frame_id r);
  86
  87
  88 /* For every stopped thread, GDB tracks two frames: current and
  89    selected.  Current frame is the inner most frame of the selected
  90    thread.  Selected frame is the one being examined by the the GDB
  91    CLI (selected using `up', `down', ...).  The frames are created
  92    on-demand (via get_prev_frame()) and then held in a frame cache.  */
  93 /* FIXME: cagney/2002-11-28: Er, there is a lie here.  If you do the
  94    sequence: `thread 1; up; thread 2; thread 1' you loose thread 1's
  95    selected frame.  At present GDB only tracks the selected frame of
  96    the current thread.  But be warned, that might change.  */
  97 /* FIXME: cagney/2002-11-14: At any time, only one thread's selected
  98    and current frame can be active.  Switching threads causes gdb to
  99    discard all that cached frame information.  Ulgh!  Instead, current
 100    and selected frame should be bound to a thread.  */
 101
 102 /* On demand, create the inner most frame using information found in
 103    the inferior.  If the inner most frame can't be created, throw an
 104    error.  */
 105 extern struct frame_info *get_current_frame (void);
 106
 107 /* Invalidates the frame cache (this function should have been called
 108    invalidate_cached_frames).
 109
 110    FIXME: cagney/2002-11-28: The only difference between
 111    flush_cached_frames() and reinit_frame_cache() is that the latter
 112    explicitly sets the selected frame back to the current frame there
 113    isn't any real difference (except that one delays the selection of
 114    a new frame).  Code can instead simply rely on get_selected_frame()
 115    to reinit's the selected frame as needed.  As for invalidating the
 116    cache, there should be two methods one that reverts the thread's
 117    selected frame back to current frame (for when the inferior
 118    resumes) and one that does not (for when the user modifies the
 119    target invalidating the frame cache).  */
 120 extern void flush_cached_frames (void);
 121 extern void reinit_frame_cache (void);
 122
 123 /* On demand, create the selected frame and then return it.  If the
 124    selected frame can not be created, this function throws an error.  */
 125 /* FIXME: cagney/2002-11-28: At present, when there is no selected
 126    frame, this function always returns the current (inner most) frame.
 127    It should instead, when a thread has previously had its frame
 128    selected (but not resumed) and the frame cache invalidated, find
 129    and then return that thread's previously selected frame.  */
 130 extern struct frame_info *get_selected_frame (void);
 131
 132 /* Select a specific frame.  NULL, apparently implies re-select the
 133    inner most frame.  */
 134 extern void select_frame (struct frame_info *);
 135
 136 /* Given a FRAME, return the next (more inner, younger) or previous
 137    (more outer, older) frame.  */
 138 extern struct frame_info *get_prev_frame (struct frame_info *);
 139 extern struct frame_info *get_next_frame (struct frame_info *);
 140
 141 /* Given a frame's ID, relocate the frame.  Returns NULL if the frame
 142    is not found.  */
 143 extern struct frame_info *frame_find_by_id (struct frame_id id);
 144
 145 /* Base attributes of a frame: */
 146
 147 /* The frame's `resume' address.  Where the program will resume in
 148    this frame.  */
 149 extern CORE_ADDR get_frame_pc (struct frame_info *);
 150
 151 /* Closely related to the resume address, various symbol table
 152    attributes that are determined by the PC.  Note that for a normal
 153    frame, the PC refers to the resume address after the return, and
 154    not the call instruction.  In such a case, the address is adjusted
 155    so that it (approximatly) identifies the call site (and not return
 156    site).
 157
 158    NOTE: cagney/2002-11-28: The frame cache could be used to cache the
 159    computed value.  Working on the assumption that the bottle-neck is
 160    in the single step code, and that code causes the frame cache to be
 161    constantly flushed, caching things in a frame is probably of little
 162    benefit.  As they say `show us the numbers'.
 163
 164    NOTE: cagney/2002-11-28: Plenty more where this one came from:
 165    find_frame_block(), find_frame_partial_function(),
 166    find_frame_symtab(), find_frame_function().  Each will need to be
 167    carefully considered to determine if the real intent was for it to
 168    apply to the PC or the adjusted PC.  */
 169 extern void find_frame_sal (struct frame_info *frame,
 170                             struct symtab_and_line *sal);
 171
 172 /* Return the frame address from FI.  Except in the machine-dependent
 173    *FRAME* macros, a frame address has no defined meaning other than
 174    as a magic cookie which identifies a frame over calls to the
 175    inferior (um, SEE NOTE BELOW).  The only known exception is
 176    inferior.h (DEPRECATED_PC_IN_CALL_DUMMY) [ON_STACK]; see comments
 177    there.  You cannot assume that a frame address contains enough
 178    information to reconstruct the frame; if you want more than just to
 179    identify the frame (e.g. be able to fetch variables relative to
 180    that frame), then save the whole struct frame_info (and the next
 181    struct frame_info, since the latter is used for fetching variables
 182    on some machines) (um, again SEE NOTE BELOW).
 183
 184    NOTE: cagney/2002-11-18: Actually, the frame address isn't
 185    sufficient for identifying a frame, and the counter examples are
 186    wrong!
 187
 188    Code that needs to (re)identify a frame must use get_frame_id() and
 189    frame_find_by_id() (and in the future, a frame_compare() function
 190    instead of INNER_THAN()).  Two reasons: an architecture (e.g.,
 191    ia64) can have more than one frame address (due to multiple stack
 192    pointers) (frame ID is going to be expanded to accomodate this);
 193    successive frameless function calls can only be differientated by
 194    comparing both the frame's base and the frame's enclosing function
 195    (frame_find_by_id() is going to be modified to perform this test).
 196
 197    The generic dummy frame version of DEPRECATED_PC_IN_CALL_DUMMY() is
 198    able to identify a dummy frame using only the PC value.  So the
 199    frame address is not needed.  In fact, most
 200    DEPRECATED_PC_IN_CALL_DUMMY() calls now pass zero as the frame/sp
 201    values as the caller knows that those values won't be used.  Once
 202    all architectures are using generic dummy frames,
 203    DEPRECATED_PC_IN_CALL_DUMMY() can drop the sp/frame parameters.
 204    When it comes to finding a dummy frame, the next frame's frame ID
 205    (with out duing an unwind) can be used (ok, could if it wasn't for
 206    the need to change the way the PPC defined frame base in a strange
 207    way).
 208
 209    Modern architectures should be using something like dwarf2's
 210    location expression to describe where a variable lives.  Such
 211    expressions specify their own debug info centric frame address.
 212    Consequently, a generic frame address is pretty meaningless.  */
 213
 214 extern CORE_ADDR get_frame_base (struct frame_info *);
 215
 216 /* Return the per-frame unique identifer.  Can be used to relocate a
 217    frame after a frame cache flush (and other similar operations).  If
 218    FI is NULL, return the null_frame_id.  */
 219 extern struct frame_id get_frame_id (struct frame_info *fi);
 220
 221 /* The frame's level: 0 for innermost, 1 for its caller, ...; or -1
 222    for an invalid frame).  */
 223 extern int frame_relative_level (struct frame_info *fi);
 224
 225 /* Return the frame's type.  Some are real, some are signal
 226    trampolines, and some are completly artificial (dummy).  */
 227
 228 enum frame_type
 229 {
 230   /* A true stack frame, created by the target program during normal
 231      execution.  */
 232   NORMAL_FRAME,
 233   /* A fake frame, created by GDB when performing an inferior function
 234      call.  */
 235   DUMMY_FRAME,
 236   /* In a signal handler, various OSs handle this in various ways.
 237      The main thing is that the frame may be far from normal.  */
 238   SIGTRAMP_FRAME
 239 };
 240 extern enum frame_type get_frame_type (struct frame_info *);
 241
 242 /* FIXME: cagney/2002-11-10: Some targets want to directly mark a
 243    frame as being of a specific type.  This shouldn't be necessary.
 244    PC_IN_SIGTRAMP() indicates a SIGTRAMP_FRAME and
 245    DEPRECATED_PC_IN_CALL_DUMMY() indicates a DUMMY_FRAME.  I suspect
 246    the real problem here is that get_prev_frame() only sets
 247    initialized after DEPRECATED_INIT_EXTRA_FRAME_INFO as been called.
 248    Consequently, some targets found that the frame's type was wrong
 249    and tried to fix it.  The correct fix is to modify get_prev_frame()
 250    so that it initializes the frame's type before calling any other
 251    functions.  */
 252 extern void deprecated_set_frame_type (struct frame_info *,
 253                                        enum frame_type type);
 254
 255 /* Unwind the stack frame so that the value of REGNUM, in the previous
 256    (up, older) frame is returned.  If VALUEP is NULL, don't
 257    fetch/compute the value.  Instead just return the location of the
 258    value.  */
 259 extern void frame_register_unwind (struct frame_info *frame, int regnum,
 260                                    int *optimizedp, enum lval_type *lvalp,
 261                                    CORE_ADDR *addrp, int *realnump,
 262                                    void *valuep);
 263
 264 /* More convenient interface to frame_register_unwind().  */
 265 /* NOTE: cagney/2002-09-13: Return void as one day these functions may
 266    be changed to return an indication that the read succeeded.  */
 267
 268 extern void frame_unwind_register (struct frame_info *frame,
 269                                    int regnum, void *buf);
 270
 271 extern void frame_unwind_signed_register (struct frame_info *frame,
 272                                           int regnum, LONGEST *val);
 273
 274 extern void frame_unwind_unsigned_register (struct frame_info *frame,
 275                                             int regnum, ULONGEST *val);
 276
 277 /* Get the value of the register that belongs to this FRAME.  This
 278    function is a wrapper to the call sequence ``frame_unwind_register
 279    (get_next_frame (FRAME))''.  As per frame_register_unwind(), if
 280    VALUEP is NULL, the registers value is not fetched/computed.  */
 281
 282 extern void frame_register (struct frame_info *frame, int regnum,
 283                             int *optimizedp, enum lval_type *lvalp,
 284                             CORE_ADDR *addrp, int *realnump,
 285                             void *valuep);
 286
 287 /* More convenient interface to frame_register().  */
 288 /* NOTE: cagney/2002-09-13: Return void as one day these functions may
 289    be changed to return an indication that the read succeeded.  */
 290
 291 extern void frame_read_register (struct frame_info *frame, int regnum,
 292                                  void *buf);
 293
 294 extern void frame_read_signed_register (struct frame_info *frame,
 295                                         int regnum, LONGEST *val);
 296
 297 extern void frame_read_unsigned_register (struct frame_info *frame,
 298                                           int regnum, ULONGEST *val);
 299
 300 /* Map between a frame register number and its name.  A frame register
 301    space is a superset of the cooked register space --- it also
 302    includes builtin registers.  If NAMELEN is negative, use the NAME's
 303    length when doing the comparison.  */
 304
 305 extern int frame_map_name_to_regnum (const char *name, int namelen);
 306 extern const char *frame_map_regnum_to_name (int regnum);
 307
 308 /* Unwind the PC.  Strictly speaking return the resume address of the
 309    calling frame.  For GDB, `pc' is the resume address and not a
 310    specific register.  */
 311
 312 extern CORE_ADDR frame_pc_unwind (struct frame_info *frame);
 313
 314 /* Discard the specified frame.  Restoring the registers to the state
 315    of the caller.  */
 316 extern void frame_pop (struct frame_info *frame);
 317
 318 /* Describe the saved registers of a frame.  */
 319
 320 #if defined (EXTRA_FRAME_INFO) || defined (FRAME_FIND_SAVED_REGS)
 321 /* XXXX - deprecated */
 322 struct frame_saved_regs
 323   {
 324     /* For each register R (except the SP), regs[R] is the address at
 325        which it was saved on entry to the frame, or zero if it was not
 326        saved on entry to this frame.  This includes special registers
 327        such as pc and fp saved in special ways in the stack frame.
 328
 329        regs[SP_REGNUM] is different.  It holds the actual SP, not the
 330        address at which it was saved.  */
 331
 332     CORE_ADDR regs[NUM_REGS];
 333   };
 334 #endif
 335
 336 /* We keep a cache of stack frames, each of which is a "struct
 337    frame_info".  The innermost one gets allocated (in
 338    wait_for_inferior) each time the inferior stops; current_frame
 339    points to it.  Additional frames get allocated (in
 340    get_prev_frame) as needed, and are chained through the next
 341    and prev fields.  Any time that the frame cache becomes invalid
 342    (most notably when we execute something, but also if we change how
 343    we interpret the frames (e.g. "set heuristic-fence-post" in
 344    mips-tdep.c, or anything which reads new symbols)), we should call
 345    reinit_frame_cache.  */
 346
 347 struct frame_info
 348   {
 349     /* Nominal address of the frame described.  See comments at
 350        get_frame_base() about what this means outside the *FRAME*
 351        macros; in the *FRAME* macros, it can mean whatever makes most
 352        sense for this machine.  */
 353     CORE_ADDR frame;
 354
 355     /* Address at which execution is occurring in this frame.
 356        For the innermost frame, it's the current pc.
 357        For other frames, it is a pc saved in the next frame.  */
 358     CORE_ADDR pc;
 359
 360     /* Level of this frame.  The inner-most (youngest) frame is at
 361        level 0.  As you move towards the outer-most (oldest) frame,
 362        the level increases.  This is a cached value.  It could just as
 363        easily be computed by counting back from the selected frame to
 364        the inner most frame.  */
 365     /* NOTE: cagney/2002-04-05: Perhaphs a level of ``-1'' should be
 366        reserved to indicate a bogus frame - one that has been created
 367        just to keep GDB happy (GDB always needs a frame).  For the
 368        moment leave this as speculation.  */
 369     int level;
 370
 371     /* The frame's type.  */
 372     enum frame_type type;
 373
 374     /* For each register, address of where it was saved on entry to
 375        the frame, or zero if it was not saved on entry to this frame.
 376        This includes special registers such as pc and fp saved in
 377        special ways in the stack frame.  The SP_REGNUM is even more
 378        special, the address here is the sp for the previous frame, not
 379        the address where the sp was saved.  */
 380     /* Allocated by frame_saved_regs_zalloc () which is called /
 381        initialized by DEPRECATED_FRAME_INIT_SAVED_REGS(). */
 382     CORE_ADDR *saved_regs;      /*NUM_REGS + NUM_PSEUDO_REGS*/
 383
 384 #ifdef EXTRA_FRAME_INFO
 385     /* XXXX - deprecated */
 386     /* Anything extra for this structure that may have been defined
 387        in the machine dependent files. */
 388       EXTRA_FRAME_INFO
 389 #endif
 390
 391     /* Anything extra for this structure that may have been defined
 392        in the machine dependent files. */
 393     /* Allocated by frame_extra_info_zalloc () which is called /
 394        initialized by DEPRECATED_INIT_EXTRA_FRAME_INFO */
 395     struct frame_extra_info *extra_info;
 396
 397     /* If dwarf2 unwind frame informations is used, this structure holds all
 398        related unwind data.  */
 399     struct context *context;
 400
 401     /* Prologue cache shared between the unwind functions.  See
 402        "frame-unwind.h" for more information.  */
 403     void *prologue_cache;
 404
 405     /* The frame's unwinder.  */
 406     const struct frame_unwind *unwind;
 407
 408     /* Cached copy of the previous frame's resume address.  */
 409     int pc_unwind_cache_p;
 410     CORE_ADDR pc_unwind_cache;
 411
 412     /* This frame's ID.  Note that the frame's ID, base and PC contain
 413        redundant information.  */
 414     struct frame_id id;
 415
 416     /* Pointers to the next (down, inner, younger) and previous (up,
 417        outer, older) frame_info's in the frame cache.  */
 418     struct frame_info *next; /* down, inner, younger */
 419     int prev_p;
 420     struct frame_info *prev; /* up, outer, older */
 421   };
 422
 423 /* Values for the source flag to be used in print_frame_info_base(). */
 424 enum print_what
 425   {
 426     /* Print only the source line, like in stepi. */
 427     SRC_LINE = -1,
 428     /* Print only the location, i.e. level, address (sometimes)
 429        function, args, file, line, line num. */
 430     LOCATION,
 431     /* Print both of the above. */
 432     SRC_AND_LOC,
 433     /* Print location only, but always include the address. */
 434     LOC_AND_ADDRESS
 435   };
 436
 437 /* Allocate additional space for appendices to a struct frame_info.
 438    NOTE: Much of GDB's code works on the assumption that the allocated
 439    saved_regs[] array is the size specified below.  If you try to make
 440    that array smaller, GDB will happily walk off its end. */
 441
 442 #ifdef SIZEOF_FRAME_SAVED_REGS
 443 #error "SIZEOF_FRAME_SAVED_REGS can not be re-defined"
 444 #endif
 445 #define SIZEOF_FRAME_SAVED_REGS \
 446         (sizeof (CORE_ADDR) * (NUM_REGS+NUM_PSEUDO_REGS))
 447
 448 /* Allocate zero initialized memory from the frame cache obstack.
 449    Appendices to the frame info (such as the unwind cache) should
 450    allocate memory using this method.  */
 451
 452 extern void *frame_obstack_zalloc (unsigned long size);
 453 #define FRAME_OBSTACK_ZALLOC(TYPE) ((TYPE *) frame_obstack_zalloc (sizeof (TYPE)))
 454
 455 /* If FRAME_CHAIN_VALID returns zero it means that the given frame
 456    is the outermost one and has no caller.  */
 457
 458 extern int frame_chain_valid (CORE_ADDR, struct frame_info *);
 459
 460 extern void generic_save_dummy_frame_tos (CORE_ADDR sp);
 461
 462
 463 #ifdef FRAME_FIND_SAVED_REGS
 464 /* XXX - deprecated */
 465 #define DEPRECATED_FRAME_INIT_SAVED_REGS(FI) deprecated_get_frame_saved_regs (FI, NULL)
 466 extern void deprecated_get_frame_saved_regs (struct frame_info *,
 467                                              struct frame_saved_regs *);
 468 #endif
 469
 470 extern struct block *get_frame_block (struct frame_info *,
 471                                       CORE_ADDR *addr_in_block);
 472
 473 /* Return the `struct block' that belongs to the selected thread's
 474    selected frame.  If the inferior has no state, return NULL.
 475
 476    NOTE: cagney/2002-11-29:
 477
 478    No state?  Does the inferior have any execution state (a core file
 479    does, an executable does not).  At present the code tests
 480    `target_has_stack' but I'm left wondering if it should test
 481    `target_has_registers' or, even, a merged target_has_state.
 482
 483    Should it look at the most recently specified SAL?  If the target
 484    has no state, should this function try to extract a block from the
 485    most recently selected SAL?  That way `list foo' would give it some
 486    sort of reference point.  Then again, perhaphs that would confuse
 487    things.
 488
 489    Calls to this function can be broken down into two categories: Code
 490    that uses the selected block as an additional, but optional, data
 491    point; Code that uses the selected block as a prop, when it should
 492    have the relevant frame/block/pc explicitly passed in.
 493
 494    The latter can be eliminated by correctly parameterizing the code,
 495    the former though is more interesting.  Per the "address" command,
 496    it occures in the CLI code and makes it possible for commands to
 497    work, even when the inferior has no state.  */
 498
 499 extern struct block *get_selected_block (CORE_ADDR *addr_in_block);
 500
 501 extern struct symbol *get_frame_function (struct frame_info *);
 502
 503 extern CORE_ADDR frame_address_in_block (struct frame_info *);
 504
 505 extern CORE_ADDR get_pc_function_start (CORE_ADDR);
 506
 507 extern int frameless_look_for_prologue (struct frame_info *);
 508
 509 extern void print_frame_args (struct symbol *, struct frame_info *,
 510                               int, struct ui_file *);
 511
 512 extern struct frame_info *find_relative_frame (struct frame_info *, int *);
 513
 514 extern void show_and_print_stack_frame (struct frame_info *fi, int level,
 515                                         int source);
 516
 517 extern void print_stack_frame (struct frame_info *, int, int);
 518
 519 extern void show_stack_frame (struct frame_info *);
 520
 521 extern void print_frame_info (struct frame_info *, int, int, int);
 522
 523 extern void show_frame_info (struct frame_info *, int, int, int);
 524
 525 extern struct frame_info *block_innermost_frame (struct block *);
 526
 527 /* NOTE: cagney/2002-09-13: There is no need for this function.
 528    Instead either of frame_unwind_signed_register() or
 529    frame_unwind_unsigned_register() can be used.  */
 530 extern CORE_ADDR deprecated_read_register_dummy (CORE_ADDR pc,
 531                                                  CORE_ADDR fp, int);
 532 extern void generic_push_dummy_frame (void);
 533 extern void generic_pop_current_frame (void (*)(struct frame_info *));
 534 extern void generic_pop_dummy_frame (void);
 535
 536 extern int generic_pc_in_call_dummy (CORE_ADDR pc,
 537                                      CORE_ADDR sp, CORE_ADDR fp);
 538
 539 /* NOTE: cagney/2002-06-26: Targets should no longer use this
 540    function.  Instead, the contents of a dummy frames registers can be
 541    obtained by applying: frame_register_unwind to the dummy frame; or
 542    frame_register_unwind() to the next outer frame.  */
 543
 544 extern char *deprecated_generic_find_dummy_frame (CORE_ADDR pc, CORE_ADDR fp);
 545
 546 extern void generic_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun,
 547                                     int nargs, struct value **args,
 548                                     struct type *type, int gcc_p);
 549
 550 void generic_unwind_get_saved_register (char *raw_buffer,
 551                                         int *optimizedp,
 552                                         CORE_ADDR *addrp,
 553                                         struct frame_info *frame,
 554                                         int regnum,
 555                                         enum lval_type *lvalp);
 556
 557 /* The function generic_get_saved_register() has been made obsolete.
 558    DEPRECATED_GET_SAVED_REGISTER now defaults to the recursive
 559    equivalent - generic_unwind_get_saved_register() - so there is no
 560    need to even set DEPRECATED_GET_SAVED_REGISTER.  Architectures that
 561    need to override the register unwind mechanism should modify
 562    frame->unwind().  */
 563 extern void deprecated_generic_get_saved_register (char *, int *, CORE_ADDR *,
 564                                                    struct frame_info *, int,
 565                                                    enum lval_type *);
 566
 567 extern void generic_save_call_dummy_addr (CORE_ADDR lo, CORE_ADDR hi);
 568
 569 /* FIXME: cagney/2003-02-02: Should be deprecated or replaced with a
 570    function called frame_read_register_p().  This slightly weird (and
 571    older) variant of frame_read_register() returns zero (indicating
 572    the register is unavailable) if either: the register isn't cached;
 573    or the register has been optimized out.  Problem is, neither check
 574    is exactly correct.  A register can't be optimized out (it may not
 575    have been saved as part of a function call); The fact that a
 576    register isn't in the register cache doesn't mean that the register
 577    isn't available (it could have been fetched from memory).  */
 578
 579 extern int frame_register_read (struct frame_info *frame, int regnum,
 580                                 void *buf);
 581
 582 /* From stack.c.  */
 583 extern void args_info (char *, int);
 584
 585 extern void locals_info (char *, int);
 586
 587 extern void (*selected_frame_level_changed_hook) (int);
 588
 589 extern void return_command (char *, int);
 590
 591
 592 /* NOTE: cagney/2002-11-27:
 593
 594    You might think that the below global can simply be replaced by a
 595    call to either get_selected_frame() or select_frame().
 596
 597    Unfortunatly, it isn't that easy.
 598
 599    The relevant code needs to be audited to determine if it is
 600    possible (or pratical) to instead pass the applicable frame in as a
 601    parameter.  For instance, DEPRECATED_DO_REGISTERS_INFO() relied on
 602    the deprecated_selected_frame global, while its replacement,
 603    PRINT_REGISTERS_INFO(), is parameterized with the selected frame.
 604    The only real exceptions occure at the edge (in the CLI code) where
 605    user commands need to pick up the selected frame before proceeding.
 606
 607    This is important.  GDB is trying to stamp out the hack:
 608
 609    saved_frame = deprecated_selected_frame;
 610    deprecated_selected_frame = ...;
 611    hack_using_global_selected_frame ();
 612    deprecated_selected_frame = saved_frame;
 613
 614    Take care!  */
 615
 616 extern struct frame_info *deprecated_selected_frame;
 617
 618
 619 /* Create a frame using the specified BASE and PC.  */
 620
 621 extern struct frame_info *create_new_frame (CORE_ADDR base, CORE_ADDR pc);
 622
 623
 624 /* Create/access the frame's `extra info'.  The extra info is used by
 625    older code to store information such as the analyzed prologue.  The
 626    zalloc() should only be called by the INIT_EXTRA_INFO method.  */
 627
 628 extern struct frame_extra_info *frame_extra_info_zalloc (struct frame_info *fi,
 629                                                          long size);
 630 extern struct frame_extra_info *get_frame_extra_info (struct frame_info *fi);
 631
 632 /* Create/access the frame's `saved_regs'.  The saved regs are used by
 633    older code to store the address of each register (except for
 634    SP_REGNUM where the value of the register in the previous frame is
 635    stored).  */
 636 extern CORE_ADDR *frame_saved_regs_zalloc (struct frame_info *);
 637 extern CORE_ADDR *get_frame_saved_regs (struct frame_info *);
 638
 639 /* FIXME: cagney/2002-12-06: Has the PC in the current frame changed?
 640    "infrun.c", Thanks to DECR_PC_AFTER_BREAK, can change the PC after
 641    the initial frame create.  This puts things back in sync.  */
 642 extern void deprecated_update_frame_pc_hack (struct frame_info *frame,
 643                                              CORE_ADDR pc);
 644
 645 /* FIXME: cagney/2002-12-18: Has the frame's base changed?  Or to be
 646    more exact, whas that initial guess at the frame's base as returned
 647    by read_fp() wrong.  If it was, fix it.  This shouldn't be
 648    necessary since the code should be getting the frame's base correct
 649    from the outset.  */
 650 extern void deprecated_update_frame_base_hack (struct frame_info *frame,
 651                                                CORE_ADDR base);
 652
 653 /* FIXME: cagney/2003-01-04: Explicitly set the frame's saved_regs
 654    and/or extra_info.  Target code is allocating a fake frame and than
 655    initializing that to get around the problem of, when creating the
 656    inner most frame, there is no where to cache information such as
 657    the prologue analysis.  This is fixed by the new unwind mechanism -
 658    even the inner most frame has somewhere to store things like the
 659    prolog analysis (or at least will once the frame overhaul is
 660    finished).  */
 661 extern void deprecated_set_frame_saved_regs_hack (struct frame_info *frame,
 662                                                   CORE_ADDR *saved_regs);
 663 extern void deprecated_set_frame_extra_info_hack (struct frame_info *frame,
 664                                                   struct frame_extra_info *extra_info);
 665
 666 /* FIXME: cagney/2003-01-04: Allocate a frame from the heap (rather
 667    than the frame obstack).  Targets do this as a way of saving the
 668    prologue analysis from the inner most frame before that frame has
 669    been created.  By always creating a frame, this problem goes away.  */
 670 extern struct frame_info *deprecated_frame_xmalloc (void);
 671
 672 /* FIXME: cagney/2003-01-05: Allocate a frame, along with the
 673    saved_regs and extra_info.  Set up cleanups for all three.  Same as
 674    for deprecated_frame_xmalloc, targets are calling this when
 675    creating a scratch `struct frame_info'.  The frame overhaul makes
 676    this unnecessary since all frame queries are parameterized with a
 677    common cache parameter and a frame.  */
 678 extern struct frame_info *deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs,
 679                                                                  long sizeof_extra_info);
 680
 681 /* FIXME: cagney/2003-01-07: These are just nasty.  Code shouldn't be
 682    doing this.  I suspect it dates back to the days when every field
 683    of an allocated structure was explicitly initialized.  */
 684 extern void deprecated_set_frame_next_hack (struct frame_info *fi,
 685                                             struct frame_info *next);
 686 extern void deprecated_set_frame_prev_hack (struct frame_info *fi,
 687                                             struct frame_info *prev);
 688
 689 /* FIXME: cagney/2003-01-07: Instead of the dwarf2cfi having its own
 690    dedicated `struct frame_info . context' field, the code should use
 691    the per frame `unwind_cache' that is passed to the
 692    frame_pc_unwind(), frame_register_unwind() and frame_id_unwind()
 693    methods.
 694
 695    See "dummy-frame.c" for an example of how a cfi-frame object can be
 696    implemented using this.  */
 697 extern struct context *deprecated_get_frame_context (struct frame_info *fi);
 698 extern void deprecated_set_frame_context (struct frame_info *fi,
 699                                           struct context *context);
 700
 701 /* Return non-zero if the architecture is relying on legacy frame
 702    code.  */
 703 extern int legacy_frame_p (struct gdbarch *gdbarch);
 704
 705 #endif /* !defined (FRAME_H)  */