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, 2004 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 /* The following is the intended naming schema for frame functions. 27 It isn't 100% consistent, but it is aproaching that. Frame naming 28 schema: 29 30 Prefixes: 31 32 get_frame_WHAT...(): Get WHAT from the THIS frame (functionaly 33 equivalent to THIS->next->unwind->what) 34 35 frame_unwind_WHAT...(): Unwind THIS frame's WHAT from the NEXT 36 frame. 37 38 put_frame_WHAT...(): Put a value into this frame (unsafe, need to 39 invalidate the frame / regcache afterwards) (better name more 40 strongly hinting at its unsafeness) 41 42 safe_....(): Safer version of various functions, doesn't throw an 43 error (leave this for later?). Returns non-zero / non-NULL if the 44 request succeeds, zero / NULL otherwize. 45 46 Suffixes: 47 48 void /frame/_WHAT(): Read WHAT's value into the buffer parameter. 49 50 ULONGEST /frame/_WHAT_unsigned(): Return an unsigned value (the 51 alternative is *frame_unsigned_WHAT). 52 53 LONGEST /frame/_WHAT_signed(): Return WHAT signed value. 54 55 What: 56 57 /frame/_memory* (frame, coreaddr, len [, buf]): Extract/return 58 *memory. 59 60 /frame/_register* (frame, regnum [, buf]): extract/return register. 61 62 CORE_ADDR /frame/_{pc,sp,...} (frame): Resume address, innner most 63 stack *address, ... 64 65 */ 66 67 struct symtab_and_line; 68 struct frame_unwind; 69 struct frame_base; 70 struct block; 71 struct gdbarch; 72 struct ui_file; 73 74 /* The frame object. */ 75 76 struct frame_info; 77 78 /* The frame object's ID. This provides a per-frame unique identifier 79 that can be used to relocate a `struct frame_info' after a target 80 resume or a frame cache destruct. It of course assumes that the 81 inferior hasn't unwound the stack past that frame. */ 82 83 struct frame_id 84 { 85 /* The frame's stack address. This shall be constant through out 86 the lifetime of a frame. Note that this requirement applies to 87 not just the function body, but also the prologue and (in theory 88 at least) the epilogue. Since that value needs to fall either on 89 the boundary, or within the frame's address range, the frame's 90 outer-most address (the inner-most address of the previous frame) 91 is used. Watch out for all the legacy targets that still use the 92 function pointer register or stack pointer register. They are 93 wrong. 94 95 This field is valid only if stack_addr_p is true. Otherwise, this 96 frame represents the null frame. */ 97 CORE_ADDR stack_addr; 98 99 /* The frame's code address. This shall be constant through out the 100 lifetime of the frame. While the PC (a.k.a. resume address) 101 changes as the function is executed, this code address cannot. 102 Typically, it is set to the address of the entry point of the 103 frame's function (as returned by frame_func_unwind(). 104 105 This field is valid only if code_addr_p is true. Otherwise, this 106 frame is considered to have a wildcard code address, i.e. one that 107 matches every address value in frame comparisons. */ 108 CORE_ADDR code_addr; 109 110 /* The frame's special address. This shall be constant through out the 111 lifetime of the frame. This is used for architectures that may have 112 frames that do not change the stack but are still distinct and have 113 some form of distinct identifier (e.g. the ia64 which uses a 2nd 114 stack for registers). This field is treated as unordered - i.e. will 115 not be used in frame ordering comparisons such as frame_id_inner(). 116 117 This field is valid only if special_addr_p is true. Otherwise, this 118 frame is considered to have a wildcard special address, i.e. one that 119 matches every address value in frame comparisons. */ 120 CORE_ADDR special_addr; 121 122 /* Flags to indicate the above fields have valid contents. */ 123 unsigned int stack_addr_p : 1; 124 unsigned int code_addr_p : 1; 125 unsigned int special_addr_p : 1; 126 }; 127 128 /* Methods for constructing and comparing Frame IDs. 129 130 NOTE: Given stackless functions A and B, where A calls B (and hence 131 B is inner-to A). The relationships: !eq(A,B); !eq(B,A); 132 !inner(A,B); !inner(B,A); all hold. 133 134 This is because, while B is inner-to A, B is not strictly inner-to A. 135 Being stackless, they have an identical .stack_addr value, and differ 136 only by their unordered .code_addr and/or .special_addr values. 137 138 Because frame_id_inner is only used as a safety net (e.g., 139 detect a corrupt stack) the lack of strictness is not a problem. 140 Code needing to determine an exact relationship between two frames 141 must instead use frame_id_eq and frame_id_unwind. For instance, 142 in the above, to determine that A stepped-into B, the equation 143 "A.id != B.id && A.id == id_unwind (B)" can be used. */ 144 145 /* For convenience. All fields are zero. */ 146 extern const struct frame_id null_frame_id; 147 148 /* Construct a frame ID. The first parameter is the frame's constant 149 stack address (typically the outer-bound), and the second the 150 frame's constant code address (typically the entry point). 151 The special identifier address is set to indicate a wild card. */ 152 extern struct frame_id frame_id_build (CORE_ADDR stack_addr, 153 CORE_ADDR code_addr); 154 155 /* Construct a special frame ID. The first parameter is the frame's constant 156 stack address (typically the outer-bound), the second is the 157 frame's constant code address (typically the entry point), 158 and the third parameter is the frame's special identifier address. */ 159 extern struct frame_id frame_id_build_special (CORE_ADDR stack_addr, 160 CORE_ADDR code_addr, 161 CORE_ADDR special_addr); 162 163 /* Construct a wild card frame ID. The parameter is the frame's constant 164 stack address (typically the outer-bound). The code address as well 165 as the special identifier address are set to indicate wild cards. */ 166 extern struct frame_id frame_id_build_wild (CORE_ADDR stack_addr); 167 168 /* Returns non-zero when L is a valid frame (a valid frame has a 169 non-zero .base). */ 170 extern int frame_id_p (struct frame_id l); 171 172 /* Returns non-zero when L and R identify the same frame, or, if 173 either L or R have a zero .func, then the same frame base. */ 174 extern int frame_id_eq (struct frame_id l, struct frame_id r); 175 176 /* Returns non-zero when L is strictly inner-than R (they have 177 different frame .bases). Neither L, nor R can be `null'. See note 178 above about frameless functions. */ 179 extern int frame_id_inner (struct frame_id l, struct frame_id r); 180 181 /* Write the internal representation of a frame ID on the specified 182 stream. */ 183 extern void fprint_frame_id (struct ui_file *file, struct frame_id id); 184 185 186 /* For every stopped thread, GDB tracks two frames: current and 187 selected. Current frame is the inner most frame of the selected 188 thread. Selected frame is the one being examined by the the GDB 189 CLI (selected using `up', `down', ...). The frames are created 190 on-demand (via get_prev_frame()) and then held in a frame cache. */ 191 /* FIXME: cagney/2002-11-28: Er, there is a lie here. If you do the 192 sequence: `thread 1; up; thread 2; thread 1' you lose thread 1's 193 selected frame. At present GDB only tracks the selected frame of 194 the current thread. But be warned, that might change. */ 195 /* FIXME: cagney/2002-11-14: At any time, only one thread's selected 196 and current frame can be active. Switching threads causes gdb to 197 discard all that cached frame information. Ulgh! Instead, current 198 and selected frame should be bound to a thread. */ 199 200 /* On demand, create the inner most frame using information found in 201 the inferior. If the inner most frame can't be created, throw an 202 error. */ 203 extern struct frame_info *get_current_frame (void); 204 205 /* Invalidates the frame cache (this function should have been called 206 invalidate_cached_frames). 207 208 FIXME: cagney/2002-11-28: The only difference between 209 flush_cached_frames() and reinit_frame_cache() is that the latter 210 explicitly sets the selected frame back to the current frame -- there 211 isn't any real difference (except that one delays the selection of 212 a new frame). Code can instead simply rely on get_selected_frame() 213 to reinit the selected frame as needed. As for invalidating the 214 cache, there should be two methods: one that reverts the thread's 215 selected frame back to current frame (for when the inferior 216 resumes) and one that does not (for when the user modifies the 217 target invalidating the frame cache). */ 218 extern void flush_cached_frames (void); 219 extern void reinit_frame_cache (void); 220 221 /* On demand, create the selected frame and then return it. If the 222 selected frame can not be created, this function throws an error. */ 223 /* FIXME: cagney/2002-11-28: At present, when there is no selected 224 frame, this function always returns the current (inner most) frame. 225 It should instead, when a thread has previously had its frame 226 selected (but not resumed) and the frame cache invalidated, find 227 and then return that thread's previously selected frame. */ 228 extern struct frame_info *get_selected_frame (void); 229 230 /* Select a specific frame. NULL, apparently implies re-select the 231 inner most frame. */ 232 extern void select_frame (struct frame_info *); 233 234 /* Given a FRAME, return the next (more inner, younger) or previous 235 (more outer, older) frame. */ 236 extern struct frame_info *get_prev_frame (struct frame_info *); 237 extern struct frame_info *get_next_frame (struct frame_info *); 238 239 /* Given a frame's ID, relocate the frame. Returns NULL if the frame 240 is not found. */ 241 extern struct frame_info *frame_find_by_id (struct frame_id id); 242 243 /* Base attributes of a frame: */ 244 245 /* The frame's `resume' address. Where the program will resume in 246 this frame. 247 248 This replaced: frame->pc; */ 249 extern CORE_ADDR get_frame_pc (struct frame_info *); 250 251 /* An address (not necessarily aligned to an instruction boundary) 252 that falls within THIS frame's code block. 253 254 When a function call is the last statement in a block, the return 255 address for the call may land at the start of the next block. 256 Similarly, if a no-return function call is the last statement in 257 the function, the return address may end up pointing beyond the 258 function, and possibly at the start of the next function. 259 260 These methods make an allowance for this. For call frames, this 261 function returns the frame's PC-1 which "should" be an address in 262 the frame's block. */ 263 264 extern CORE_ADDR get_frame_address_in_block (struct frame_info *this_frame); 265 extern CORE_ADDR frame_unwind_address_in_block (struct frame_info *next_frame); 266 267 /* The frame's inner-most bound. AKA the stack-pointer. Confusingly 268 known as top-of-stack. */ 269 270 extern CORE_ADDR get_frame_sp (struct frame_info *); 271 extern CORE_ADDR frame_sp_unwind (struct frame_info *); 272 273 274 /* Following on from the `resume' address. Return the entry point 275 address of the function containing that resume address, or zero if 276 that function isn't known. */ 277 extern CORE_ADDR frame_func_unwind (struct frame_info *fi); 278 extern CORE_ADDR get_frame_func (struct frame_info *fi); 279 280 /* Closely related to the resume address, various symbol table 281 attributes that are determined by the PC. Note that for a normal 282 frame, the PC refers to the resume address after the return, and 283 not the call instruction. In such a case, the address is adjusted 284 so that it (approximately) identifies the call site (and not the 285 return site). 286 287 NOTE: cagney/2002-11-28: The frame cache could be used to cache the 288 computed value. Working on the assumption that the bottle-neck is 289 in the single step code, and that code causes the frame cache to be 290 constantly flushed, caching things in a frame is probably of little 291 benefit. As they say `show us the numbers'. 292 293 NOTE: cagney/2002-11-28: Plenty more where this one came from: 294 find_frame_block(), find_frame_partial_function(), 295 find_frame_symtab(), find_frame_function(). Each will need to be 296 carefully considered to determine if the real intent was for it to 297 apply to the PC or the adjusted PC. */ 298 extern void find_frame_sal (struct frame_info *frame, 299 struct symtab_and_line *sal); 300 301 /* Return the frame base (what ever that is) (DEPRECATED). 302 303 Old code was trying to use this single method for two conflicting 304 purposes. Such code needs to be updated to use either of: 305 306 get_frame_id: A low level frame unique identifier, that consists of 307 both a stack and a function address, that can be used to uniquely 308 identify a frame. This value is determined by the frame's 309 low-level unwinder, the stack part [typically] being the 310 top-of-stack of the previous frame, and the function part being the 311 function's start address. Since the correct identification of a 312 frameless function requires both the a stack and function address, 313 the old get_frame_base method was not sufficient. 314 315 get_frame_base_address: get_frame_locals_address: 316 get_frame_args_address: A set of high-level debug-info dependant 317 addresses that fall within the frame. These addresses almost 318 certainly will not match the stack address part of a frame ID (as 319 returned by get_frame_base). 320 321 This replaced: frame->frame; */ 322 323 extern CORE_ADDR get_frame_base (struct frame_info *); 324 325 /* Return the per-frame unique identifer. Can be used to relocate a 326 frame after a frame cache flush (and other similar operations). If 327 FI is NULL, return the null_frame_id. 328 329 NOTE: kettenis/20040508: These functions return a structure. On 330 platforms where structures are returned in static storage (vax, 331 m68k), this may trigger compiler bugs in code like: 332 333 if (frame_id_eq (get_frame_id (l), get_frame_id (r))) 334 335 where the return value from the first get_frame_id (l) gets 336 overwritten by the second get_frame_id (r). Please avoid writing 337 code like this. Use code like: 338 339 struct frame_id id = get_frame_id (l); 340 if (frame_id_eq (id, get_frame_id (r))) 341 342 instead, since that avoids the bug. */ 343 extern struct frame_id get_frame_id (struct frame_info *fi); 344 extern struct frame_id frame_unwind_id (struct frame_info *next_frame); 345 346 /* Assuming that a frame is `normal', return its base-address, or 0 if 347 the information isn't available. NOTE: This address is really only 348 meaningful to the frame's high-level debug info. */ 349 extern CORE_ADDR get_frame_base_address (struct frame_info *); 350 351 /* Assuming that a frame is `normal', return the base-address of the 352 local variables, or 0 if the information isn't available. NOTE: 353 This address is really only meaningful to the frame's high-level 354 debug info. Typically, the argument and locals share a single 355 base-address. */ 356 extern CORE_ADDR get_frame_locals_address (struct frame_info *); 357 358 /* Assuming that a frame is `normal', return the base-address of the 359 parameter list, or 0 if that information isn't available. NOTE: 360 This address is really only meaningful to the frame's high-level 361 debug info. Typically, the argument and locals share a single 362 base-address. */ 363 extern CORE_ADDR get_frame_args_address (struct frame_info *); 364 365 /* The frame's level: 0 for innermost, 1 for its caller, ...; or -1 366 for an invalid frame). */ 367 extern int frame_relative_level (struct frame_info *fi); 368 369 /* Return the frame's type. Some are real, some are signal 370 trampolines, and some are completely artificial (dummy). */ 371 372 enum frame_type 373 { 374 /* A true stack frame, created by the target program during normal 375 execution. */ 376 NORMAL_FRAME, 377 /* A fake frame, created by GDB when performing an inferior function 378 call. */ 379 DUMMY_FRAME, 380 /* In a signal handler, various OSs handle this in various ways. 381 The main thing is that the frame may be far from normal. */ 382 SIGTRAMP_FRAME, 383 /* Sentinel or registers frame. This frame obtains register values 384 direct from the inferior's registers. */ 385 SENTINEL_FRAME 386 }; 387 extern enum frame_type get_frame_type (struct frame_info *); 388 389 /* Unwind the stack frame so that the value of REGNUM, in the previous 390 (up, older) frame is returned. If VALUEP is NULL, don't 391 fetch/compute the value. Instead just return the location of the 392 value. */ 393 extern void frame_register_unwind (struct frame_info *frame, int regnum, 394 int *optimizedp, enum lval_type *lvalp, 395 CORE_ADDR *addrp, int *realnump, 396 void *valuep); 397 398 /* Fetch a register from this, or unwind a register from the next 399 frame. Note that the get_frame methods are wrappers to 400 frame->next->unwind. They all [potentially] throw an error if the 401 fetch fails. */ 402 403 extern void frame_unwind_register (struct frame_info *frame, 404 int regnum, void *buf); 405 extern void get_frame_register (struct frame_info *frame, 406 int regnum, void *buf); 407 408 extern LONGEST frame_unwind_register_signed (struct frame_info *frame, 409 int regnum); 410 extern LONGEST get_frame_register_signed (struct frame_info *frame, 411 int regnum); 412 extern ULONGEST frame_unwind_register_unsigned (struct frame_info *frame, 413 int regnum); 414 extern ULONGEST get_frame_register_unsigned (struct frame_info *frame, 415 int regnum); 416 417 418 /* Use frame_unwind_register_signed. */ 419 extern void frame_unwind_unsigned_register (struct frame_info *frame, 420 int regnum, ULONGEST *val); 421 422 /* Get the value of the register that belongs to this FRAME. This 423 function is a wrapper to the call sequence ``frame_register_unwind 424 (get_next_frame (FRAME))''. As per frame_register_unwind(), if 425 VALUEP is NULL, the registers value is not fetched/computed. */ 426 427 extern void frame_register (struct frame_info *frame, int regnum, 428 int *optimizedp, enum lval_type *lvalp, 429 CORE_ADDR *addrp, int *realnump, 430 void *valuep); 431 432 /* The reverse. Store a register value relative to the specified 433 frame. Note: this call makes the frame's state undefined. The 434 register and frame caches must be flushed. */ 435 extern void put_frame_register (struct frame_info *frame, int regnum, 436 const void *buf); 437 438 /* Map between a frame register number and its name. A frame register 439 space is a superset of the cooked register space --- it also 440 includes builtin registers. If NAMELEN is negative, use the NAME's 441 length when doing the comparison. */ 442 443 extern int frame_map_name_to_regnum (struct frame_info *frame, 444 const char *name, int namelen); 445 extern const char *frame_map_regnum_to_name (struct frame_info *frame, 446 int regnum); 447 448 /* Unwind the PC. Strictly speaking return the resume address of the 449 calling frame. For GDB, `pc' is the resume address and not a 450 specific register. */ 451 452 extern CORE_ADDR frame_pc_unwind (struct frame_info *frame); 453 454 /* Discard the specified frame. Restoring the registers to the state 455 of the caller. */ 456 extern void frame_pop (struct frame_info *frame); 457 458 /* Return memory from the specified frame. A frame knows its thread / 459 LWP and hence can find its way down to a target. The assumption 460 here is that the current and previous frame share a common address 461 space. 462 463 If the memory read fails, these methods throw an error. 464 465 NOTE: cagney/2003-06-03: Should there be unwind versions of these 466 methods? That isn't clear. Can code, for instance, assume that 467 this and the previous frame's memory or architecture are identical? 468 If architecture / memory changes are always separated by special 469 adaptor frames this should be ok. */ 470 471 extern void get_frame_memory (struct frame_info *this_frame, CORE_ADDR addr, 472 void *buf, int len); 473 extern LONGEST get_frame_memory_signed (struct frame_info *this_frame, 474 CORE_ADDR memaddr, int len); 475 extern ULONGEST get_frame_memory_unsigned (struct frame_info *this_frame, 476 CORE_ADDR memaddr, int len); 477 478 /* Same as above, but return non-zero when the entire memory read 479 succeeds, zero otherwize. */ 480 extern int safe_frame_unwind_memory (struct frame_info *this_frame, 481 CORE_ADDR addr, void *buf, int len); 482 483 /* Return this frame's architecture. */ 484 485 extern struct gdbarch *get_frame_arch (struct frame_info *this_frame); 486 487 488 /* Values for the source flag to be used in print_frame_info_base(). */ 489 enum print_what 490 { 491 /* Print only the source line, like in stepi. */ 492 SRC_LINE = -1, 493 /* Print only the location, i.e. level, address (sometimes) 494 function, args, file, line, line num. */ 495 LOCATION, 496 /* Print both of the above. */ 497 SRC_AND_LOC, 498 /* Print location only, but always include the address. */ 499 LOC_AND_ADDRESS 500 }; 501 502 /* Allocate additional space for appendices to a struct frame_info. 503 NOTE: Much of GDB's code works on the assumption that the allocated 504 saved_regs[] array is the size specified below. If you try to make 505 that array smaller, GDB will happily walk off its end. */ 506 507 #ifdef SIZEOF_FRAME_SAVED_REGS 508 #error "SIZEOF_FRAME_SAVED_REGS can not be re-defined" 509 #endif 510 #define SIZEOF_FRAME_SAVED_REGS \ 511 (sizeof (CORE_ADDR) * (NUM_REGS+NUM_PSEUDO_REGS)) 512 513 /* Allocate zero initialized memory from the frame cache obstack. 514 Appendices to the frame info (such as the unwind cache) should 515 allocate memory using this method. */ 516 517 extern void *frame_obstack_zalloc (unsigned long size); 518 #define FRAME_OBSTACK_ZALLOC(TYPE) ((TYPE *) frame_obstack_zalloc (sizeof (TYPE))) 519 #define FRAME_OBSTACK_CALLOC(NUMBER,TYPE) ((TYPE *) frame_obstack_zalloc ((NUMBER) * sizeof (TYPE))) 520 521 /* Create a regcache, and copy the frame's registers into it. */ 522 struct regcache *frame_save_as_regcache (struct frame_info *this_frame); 523 524 extern struct block *get_frame_block (struct frame_info *, 525 CORE_ADDR *addr_in_block); 526 527 /* Return the `struct block' that belongs to the selected thread's 528 selected frame. If the inferior has no state, return NULL. 529 530 NOTE: cagney/2002-11-29: 531 532 No state? Does the inferior have any execution state (a core file 533 does, an executable does not). At present the code tests 534 `target_has_stack' but I'm left wondering if it should test 535 `target_has_registers' or, even, a merged target_has_state. 536 537 Should it look at the most recently specified SAL? If the target 538 has no state, should this function try to extract a block from the 539 most recently selected SAL? That way `list foo' would give it some 540 sort of reference point. Then again, perhaps that would confuse 541 things. 542 543 Calls to this function can be broken down into two categories: Code 544 that uses the selected block as an additional, but optional, data 545 point; Code that uses the selected block as a prop, when it should 546 have the relevant frame/block/pc explicitly passed in. 547 548 The latter can be eliminated by correctly parameterizing the code, 549 the former though is more interesting. Per the "address" command, 550 it occurs in the CLI code and makes it possible for commands to 551 work, even when the inferior has no state. */ 552 553 extern struct block *get_selected_block (CORE_ADDR *addr_in_block); 554 555 extern struct symbol *get_frame_function (struct frame_info *); 556 557 extern CORE_ADDR get_pc_function_start (CORE_ADDR); 558 559 extern struct frame_info *find_relative_frame (struct frame_info *, int *); 560 561 extern void show_and_print_stack_frame (struct frame_info *fi, int print_level, 562 enum print_what print_what); 563 564 extern void print_stack_frame (struct frame_info *, int print_level, 565 enum print_what print_what); 566 567 extern void show_stack_frame (struct frame_info *); 568 569 extern void print_frame_info (struct frame_info *, int print_level, 570 enum print_what print_what, int args); 571 572 extern struct frame_info *block_innermost_frame (struct block *); 573 574 extern int deprecated_pc_in_call_dummy (CORE_ADDR pc); 575 576 /* FIXME: cagney/2003-02-02: Should be deprecated or replaced with a 577 function called get_frame_register_p(). This slightly weird (and 578 older) variant of get_frame_register() returns zero (indicating the 579 register is unavailable) if either: the register isn't cached; or 580 the register has been optimized out. Problem is, neither check is 581 exactly correct. A register can't be optimized out (it may not 582 have been saved as part of a function call); The fact that a 583 register isn't in the register cache doesn't mean that the register 584 isn't available (it could have been fetched from memory). */ 585 586 extern int frame_register_read (struct frame_info *frame, int regnum, 587 void *buf); 588 589 /* From stack.c. */ 590 extern void args_info (char *, int); 591 592 extern void locals_info (char *, int); 593 594 extern void (*deprecated_selected_frame_level_changed_hook) (int); 595 596 extern void return_command (char *, int); 597 598 599 /* NOTE: cagney/2002-11-27: 600 601 You might think that the below global can simply be replaced by a 602 call to either get_selected_frame() or select_frame(). 603 604 Unfortunately, it isn't that easy. 605 606 The relevant code needs to be audited to determine if it is 607 possible (or practical) to instead pass the applicable frame in as a 608 parameter. For instance, DEPRECATED_DO_REGISTERS_INFO() relied on 609 the deprecated_selected_frame global, while its replacement, 610 PRINT_REGISTERS_INFO(), is parameterized with the selected frame. 611 The only real exceptions occur at the edge (in the CLI code) where 612 user commands need to pick up the selected frame before proceeding. 613 614 This is important. GDB is trying to stamp out the hack: 615 616 saved_frame = deprecated_selected_frame; 617 deprecated_selected_frame = ...; 618 hack_using_global_selected_frame (); 619 deprecated_selected_frame = saved_frame; 620 621 Take care! */ 622 623 extern struct frame_info *deprecated_selected_frame; 624 625 /* NOTE: drow/2003-09-06: 626 627 This function is "a step sideways" for uses of deprecated_selected_frame. 628 They should be fixed as above, but meanwhile, we needed a solution for 629 cases where functions are called with a NULL frame meaning either "the 630 program is not running" or "use the selected frame". Lazy building of 631 deprecated_selected_frame confuses the situation, because now 632 deprecated_selected_frame can be NULL even when the inferior is running. 633 634 This function calls get_selected_frame if the inferior should have a 635 frame, or returns NULL otherwise. */ 636 637 extern struct frame_info *deprecated_safe_get_selected_frame (void); 638 639 /* Create a frame using the specified BASE and PC. */ 640 641 extern struct frame_info *create_new_frame (CORE_ADDR base, CORE_ADDR pc); 642 643 /* FIXME: cagney/2002-12-06: Has the PC in the current frame changed? 644 "infrun.c", Thanks to DECR_PC_AFTER_BREAK, can change the PC after 645 the initial frame create. This puts things back in sync. 646 647 This replaced: frame->pc = ....; */ 648 extern void deprecated_update_frame_pc_hack (struct frame_info *frame, 649 CORE_ADDR pc); 650 651 /* FIXME: cagney/2002-12-18: Has the frame's base changed? Or to be 652 more exact, was that initial guess at the frame's base as returned 653 by the deleted read_fp() wrong? If it was, fix it. This shouldn't 654 be necessary since the code should be getting the frame's base 655 correct from the outset. 656 657 This replaced: frame->frame = ....; */ 658 extern void deprecated_update_frame_base_hack (struct frame_info *frame, 659 CORE_ADDR base); 660 661 #endif /* !defined (FRAME_H) */ 662