| 1 | /* Definitions for dealing with stack frames, for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1996, 1997, |
| 4 | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009 |
| 5 | Free Software Foundation, Inc. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #if !defined (FRAME_H) |
| 23 | #define FRAME_H 1 |
| 24 | |
| 25 | /* The following is the intended naming schema for frame functions. |
| 26 | It isn't 100% consistent, but it is aproaching that. Frame naming |
| 27 | schema: |
| 28 | |
| 29 | Prefixes: |
| 30 | |
| 31 | get_frame_WHAT...(): Get WHAT from the THIS frame (functionaly |
| 32 | equivalent to THIS->next->unwind->what) |
| 33 | |
| 34 | frame_unwind_WHAT...(): Unwind THIS frame's WHAT from the NEXT |
| 35 | frame. |
| 36 | |
| 37 | put_frame_WHAT...(): Put a value into this frame (unsafe, need to |
| 38 | invalidate the frame / regcache afterwards) (better name more |
| 39 | strongly hinting at its unsafeness) |
| 40 | |
| 41 | safe_....(): Safer version of various functions, doesn't throw an |
| 42 | error (leave this for later?). Returns non-zero / non-NULL if the |
| 43 | request succeeds, zero / NULL otherwize. |
| 44 | |
| 45 | Suffixes: |
| 46 | |
| 47 | void /frame/_WHAT(): Read WHAT's value into the buffer parameter. |
| 48 | |
| 49 | ULONGEST /frame/_WHAT_unsigned(): Return an unsigned value (the |
| 50 | alternative is *frame_unsigned_WHAT). |
| 51 | |
| 52 | LONGEST /frame/_WHAT_signed(): Return WHAT signed value. |
| 53 | |
| 54 | What: |
| 55 | |
| 56 | /frame/_memory* (frame, coreaddr, len [, buf]): Extract/return |
| 57 | *memory. |
| 58 | |
| 59 | /frame/_register* (frame, regnum [, buf]): extract/return register. |
| 60 | |
| 61 | CORE_ADDR /frame/_{pc,sp,...} (frame): Resume address, innner most |
| 62 | stack *address, ... |
| 63 | |
| 64 | */ |
| 65 | |
| 66 | struct symtab_and_line; |
| 67 | struct frame_unwind; |
| 68 | struct frame_base; |
| 69 | struct block; |
| 70 | struct gdbarch; |
| 71 | struct ui_file; |
| 72 | |
| 73 | /* The frame object. */ |
| 74 | |
| 75 | struct frame_info; |
| 76 | |
| 77 | /* The frame object's ID. This provides a per-frame unique identifier |
| 78 | that can be used to relocate a `struct frame_info' after a target |
| 79 | resume or a frame cache destruct. It of course assumes that the |
| 80 | inferior hasn't unwound the stack past that frame. */ |
| 81 | |
| 82 | struct frame_id |
| 83 | { |
| 84 | /* The frame's stack address. This shall be constant through out |
| 85 | the lifetime of a frame. Note that this requirement applies to |
| 86 | not just the function body, but also the prologue and (in theory |
| 87 | at least) the epilogue. Since that value needs to fall either on |
| 88 | the boundary, or within the frame's address range, the frame's |
| 89 | outer-most address (the inner-most address of the previous frame) |
| 90 | is used. Watch out for all the legacy targets that still use the |
| 91 | function pointer register or stack pointer register. They are |
| 92 | wrong. |
| 93 | |
| 94 | This field is valid only if stack_addr_p is true. Otherwise, this |
| 95 | frame represents the null frame. */ |
| 96 | CORE_ADDR stack_addr; |
| 97 | |
| 98 | /* The frame's code address. This shall be constant through out the |
| 99 | lifetime of the frame. While the PC (a.k.a. resume address) |
| 100 | changes as the function is executed, this code address cannot. |
| 101 | Typically, it is set to the address of the entry point of the |
| 102 | frame's function (as returned by get_frame_func). |
| 103 | |
| 104 | This field is valid only if code_addr_p is true. Otherwise, this |
| 105 | frame is considered to have a wildcard code address, i.e. one that |
| 106 | matches every address value in frame comparisons. */ |
| 107 | CORE_ADDR code_addr; |
| 108 | |
| 109 | /* The frame's special address. This shall be constant through out the |
| 110 | lifetime of the frame. This is used for architectures that may have |
| 111 | frames that do not change the stack but are still distinct and have |
| 112 | some form of distinct identifier (e.g. the ia64 which uses a 2nd |
| 113 | stack for registers). This field is treated as unordered - i.e. will |
| 114 | not be used in frame ordering comparisons. |
| 115 | |
| 116 | This field is valid only if special_addr_p is true. Otherwise, this |
| 117 | frame is considered to have a wildcard special address, i.e. one that |
| 118 | matches every address value in frame comparisons. */ |
| 119 | CORE_ADDR special_addr; |
| 120 | |
| 121 | /* Flags to indicate the above fields have valid contents. */ |
| 122 | unsigned int stack_addr_p : 1; |
| 123 | unsigned int code_addr_p : 1; |
| 124 | unsigned int special_addr_p : 1; |
| 125 | }; |
| 126 | |
| 127 | /* Methods for constructing and comparing Frame IDs. */ |
| 128 | |
| 129 | /* For convenience. All fields are zero. */ |
| 130 | extern const struct frame_id null_frame_id; |
| 131 | |
| 132 | /* Flag to control debugging. */ |
| 133 | |
| 134 | extern int frame_debug; |
| 135 | |
| 136 | /* Construct a frame ID. The first parameter is the frame's constant |
| 137 | stack address (typically the outer-bound), and the second the |
| 138 | frame's constant code address (typically the entry point). |
| 139 | The special identifier address is set to indicate a wild card. */ |
| 140 | extern struct frame_id frame_id_build (CORE_ADDR stack_addr, |
| 141 | CORE_ADDR code_addr); |
| 142 | |
| 143 | /* Construct a special frame ID. The first parameter is the frame's constant |
| 144 | stack address (typically the outer-bound), the second is the |
| 145 | frame's constant code address (typically the entry point), |
| 146 | and the third parameter is the frame's special identifier address. */ |
| 147 | extern struct frame_id frame_id_build_special (CORE_ADDR stack_addr, |
| 148 | CORE_ADDR code_addr, |
| 149 | CORE_ADDR special_addr); |
| 150 | |
| 151 | /* Construct a wild card frame ID. The parameter is the frame's constant |
| 152 | stack address (typically the outer-bound). The code address as well |
| 153 | as the special identifier address are set to indicate wild cards. */ |
| 154 | extern struct frame_id frame_id_build_wild (CORE_ADDR stack_addr); |
| 155 | |
| 156 | /* Returns non-zero when L is a valid frame (a valid frame has a |
| 157 | non-zero .base). */ |
| 158 | extern int frame_id_p (struct frame_id l); |
| 159 | |
| 160 | /* Returns non-zero when L and R identify the same frame, or, if |
| 161 | either L or R have a zero .func, then the same frame base. */ |
| 162 | extern int frame_id_eq (struct frame_id l, struct frame_id r); |
| 163 | |
| 164 | /* Write the internal representation of a frame ID on the specified |
| 165 | stream. */ |
| 166 | extern void fprint_frame_id (struct ui_file *file, struct frame_id id); |
| 167 | |
| 168 | |
| 169 | /* Frame types. Some are real, some are signal trampolines, and some |
| 170 | are completely artificial (dummy). */ |
| 171 | |
| 172 | enum frame_type |
| 173 | { |
| 174 | /* A true stack frame, created by the target program during normal |
| 175 | execution. */ |
| 176 | NORMAL_FRAME, |
| 177 | /* A fake frame, created by GDB when performing an inferior function |
| 178 | call. */ |
| 179 | DUMMY_FRAME, |
| 180 | /* In a signal handler, various OSs handle this in various ways. |
| 181 | The main thing is that the frame may be far from normal. */ |
| 182 | SIGTRAMP_FRAME, |
| 183 | /* Sentinel or registers frame. This frame obtains register values |
| 184 | direct from the inferior's registers. */ |
| 185 | SENTINEL_FRAME |
| 186 | }; |
| 187 | |
| 188 | /* For every stopped thread, GDB tracks two frames: current and |
| 189 | selected. Current frame is the inner most frame of the selected |
| 190 | thread. Selected frame is the one being examined by the the GDB |
| 191 | CLI (selected using `up', `down', ...). The frames are created |
| 192 | on-demand (via get_prev_frame()) and then held in a frame cache. */ |
| 193 | /* FIXME: cagney/2002-11-28: Er, there is a lie here. If you do the |
| 194 | sequence: `thread 1; up; thread 2; thread 1' you lose thread 1's |
| 195 | selected frame. At present GDB only tracks the selected frame of |
| 196 | the current thread. But be warned, that might change. */ |
| 197 | /* FIXME: cagney/2002-11-14: At any time, only one thread's selected |
| 198 | and current frame can be active. Switching threads causes gdb to |
| 199 | discard all that cached frame information. Ulgh! Instead, current |
| 200 | and selected frame should be bound to a thread. */ |
| 201 | |
| 202 | /* On demand, create the inner most frame using information found in |
| 203 | the inferior. If the inner most frame can't be created, throw an |
| 204 | error. */ |
| 205 | extern struct frame_info *get_current_frame (void); |
| 206 | |
| 207 | /* Does the current target interface have enough state to be able to |
| 208 | query the current inferior for frame info, and is the inferior in a |
| 209 | state where that is possible? */ |
| 210 | extern int has_stack_frames (void); |
| 211 | |
| 212 | /* Invalidates the frame cache (this function should have been called |
| 213 | invalidate_cached_frames). |
| 214 | |
| 215 | FIXME: cagney/2002-11-28: There should be two methods: one that |
| 216 | reverts the thread's selected frame back to current frame (for when |
| 217 | the inferior resumes) and one that does not (for when the user |
| 218 | modifies the target invalidating the frame cache). */ |
| 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 prints then throws |
| 223 | an error. When MESSAGE is non-NULL, use it for the error message, |
| 224 | otherwize use a generic error message. */ |
| 225 | /* FIXME: cagney/2002-11-28: At present, when there is no selected |
| 226 | frame, this function always returns the current (inner most) frame. |
| 227 | It should instead, when a thread has previously had its frame |
| 228 | selected (but not resumed) and the frame cache invalidated, find |
| 229 | and then return that thread's previously selected frame. */ |
| 230 | extern struct frame_info *get_selected_frame (const char *message); |
| 231 | |
| 232 | /* Select a specific frame. NULL, apparently implies re-select the |
| 233 | inner most frame. */ |
| 234 | extern void select_frame (struct frame_info *); |
| 235 | |
| 236 | /* Given a FRAME, return the next (more inner, younger) or previous |
| 237 | (more outer, older) frame. */ |
| 238 | extern struct frame_info *get_prev_frame (struct frame_info *); |
| 239 | extern struct frame_info *get_next_frame (struct frame_info *); |
| 240 | |
| 241 | /* Given a frame's ID, relocate the frame. Returns NULL if the frame |
| 242 | is not found. */ |
| 243 | extern struct frame_info *frame_find_by_id (struct frame_id id); |
| 244 | |
| 245 | /* Base attributes of a frame: */ |
| 246 | |
| 247 | /* The frame's `resume' address. Where the program will resume in |
| 248 | this frame. |
| 249 | |
| 250 | This replaced: frame->pc; */ |
| 251 | extern CORE_ADDR get_frame_pc (struct frame_info *); |
| 252 | |
| 253 | /* An address (not necessarily aligned to an instruction boundary) |
| 254 | that falls within THIS frame's code block. |
| 255 | |
| 256 | When a function call is the last statement in a block, the return |
| 257 | address for the call may land at the start of the next block. |
| 258 | Similarly, if a no-return function call is the last statement in |
| 259 | the function, the return address may end up pointing beyond the |
| 260 | function, and possibly at the start of the next function. |
| 261 | |
| 262 | These methods make an allowance for this. For call frames, this |
| 263 | function returns the frame's PC-1 which "should" be an address in |
| 264 | the frame's block. */ |
| 265 | |
| 266 | extern CORE_ADDR get_frame_address_in_block (struct frame_info *this_frame); |
| 267 | |
| 268 | /* The frame's inner-most bound. AKA the stack-pointer. Confusingly |
| 269 | known as top-of-stack. */ |
| 270 | |
| 271 | extern CORE_ADDR get_frame_sp (struct frame_info *); |
| 272 | |
| 273 | /* Following on from the `resume' address. Return the entry point |
| 274 | address of the function containing that resume address, or zero if |
| 275 | that function isn't known. */ |
| 276 | extern CORE_ADDR get_frame_func (struct frame_info *fi); |
| 277 | |
| 278 | /* Closely related to the resume address, various symbol table |
| 279 | attributes that are determined by the PC. Note that for a normal |
| 280 | frame, the PC refers to the resume address after the return, and |
| 281 | not the call instruction. In such a case, the address is adjusted |
| 282 | so that it (approximately) identifies the call site (and not the |
| 283 | return site). |
| 284 | |
| 285 | NOTE: cagney/2002-11-28: The frame cache could be used to cache the |
| 286 | computed value. Working on the assumption that the bottle-neck is |
| 287 | in the single step code, and that code causes the frame cache to be |
| 288 | constantly flushed, caching things in a frame is probably of little |
| 289 | benefit. As they say `show us the numbers'. |
| 290 | |
| 291 | NOTE: cagney/2002-11-28: Plenty more where this one came from: |
| 292 | find_frame_block(), find_frame_partial_function(), |
| 293 | find_frame_symtab(), find_frame_function(). Each will need to be |
| 294 | carefully considered to determine if the real intent was for it to |
| 295 | apply to the PC or the adjusted PC. */ |
| 296 | extern void find_frame_sal (struct frame_info *frame, |
| 297 | struct symtab_and_line *sal); |
| 298 | |
| 299 | /* Set the current source and line to the location given by frame |
| 300 | FRAME, if possible. When CENTER is true, adjust so the relevant |
| 301 | line is in the center of the next 'list'. */ |
| 302 | |
| 303 | void set_current_sal_from_frame (struct frame_info *, int); |
| 304 | |
| 305 | /* Return the frame base (what ever that is) (DEPRECATED). |
| 306 | |
| 307 | Old code was trying to use this single method for two conflicting |
| 308 | purposes. Such code needs to be updated to use either of: |
| 309 | |
| 310 | get_frame_id: A low level frame unique identifier, that consists of |
| 311 | both a stack and a function address, that can be used to uniquely |
| 312 | identify a frame. This value is determined by the frame's |
| 313 | low-level unwinder, the stack part [typically] being the |
| 314 | top-of-stack of the previous frame, and the function part being the |
| 315 | function's start address. Since the correct identification of a |
| 316 | frameless function requires both the a stack and function address, |
| 317 | the old get_frame_base method was not sufficient. |
| 318 | |
| 319 | get_frame_base_address: get_frame_locals_address: |
| 320 | get_frame_args_address: A set of high-level debug-info dependant |
| 321 | addresses that fall within the frame. These addresses almost |
| 322 | certainly will not match the stack address part of a frame ID (as |
| 323 | returned by get_frame_base). |
| 324 | |
| 325 | This replaced: frame->frame; */ |
| 326 | |
| 327 | extern CORE_ADDR get_frame_base (struct frame_info *); |
| 328 | |
| 329 | /* Return the per-frame unique identifer. Can be used to relocate a |
| 330 | frame after a frame cache flush (and other similar operations). If |
| 331 | FI is NULL, return the null_frame_id. |
| 332 | |
| 333 | NOTE: kettenis/20040508: These functions return a structure. On |
| 334 | platforms where structures are returned in static storage (vax, |
| 335 | m68k), this may trigger compiler bugs in code like: |
| 336 | |
| 337 | if (frame_id_eq (get_frame_id (l), get_frame_id (r))) |
| 338 | |
| 339 | where the return value from the first get_frame_id (l) gets |
| 340 | overwritten by the second get_frame_id (r). Please avoid writing |
| 341 | code like this. Use code like: |
| 342 | |
| 343 | struct frame_id id = get_frame_id (l); |
| 344 | if (frame_id_eq (id, get_frame_id (r))) |
| 345 | |
| 346 | instead, since that avoids the bug. */ |
| 347 | extern struct frame_id get_frame_id (struct frame_info *fi); |
| 348 | extern struct frame_id frame_unwind_id (struct frame_info *next_frame); |
| 349 | |
| 350 | /* Assuming that a frame is `normal', return its base-address, or 0 if |
| 351 | the information isn't available. NOTE: This address is really only |
| 352 | meaningful to the frame's high-level debug info. */ |
| 353 | extern CORE_ADDR get_frame_base_address (struct frame_info *); |
| 354 | |
| 355 | /* Assuming that a frame is `normal', return the base-address of the |
| 356 | local variables, or 0 if the information isn't available. NOTE: |
| 357 | This address is really only meaningful to the frame's high-level |
| 358 | debug info. Typically, the argument and locals share a single |
| 359 | base-address. */ |
| 360 | extern CORE_ADDR get_frame_locals_address (struct frame_info *); |
| 361 | |
| 362 | /* Assuming that a frame is `normal', return the base-address of the |
| 363 | parameter list, or 0 if that information isn't available. NOTE: |
| 364 | This address is really only meaningful to the frame's high-level |
| 365 | debug info. Typically, the argument and locals share a single |
| 366 | base-address. */ |
| 367 | extern CORE_ADDR get_frame_args_address (struct frame_info *); |
| 368 | |
| 369 | /* The frame's level: 0 for innermost, 1 for its caller, ...; or -1 |
| 370 | for an invalid frame). */ |
| 371 | extern int frame_relative_level (struct frame_info *fi); |
| 372 | |
| 373 | /* Return the frame's type. */ |
| 374 | |
| 375 | extern enum frame_type get_frame_type (struct frame_info *); |
| 376 | |
| 377 | /* For frames where we can not unwind further, describe why. */ |
| 378 | |
| 379 | enum unwind_stop_reason |
| 380 | { |
| 381 | /* No particular reason; either we haven't tried unwinding yet, |
| 382 | or we didn't fail. */ |
| 383 | UNWIND_NO_REASON, |
| 384 | |
| 385 | /* The previous frame's analyzer returns an invalid result |
| 386 | from this_id. |
| 387 | |
| 388 | FIXME drow/2006-08-16: This is how GDB used to indicate end of |
| 389 | stack. We should migrate to a model where frames always have a |
| 390 | valid ID, and this becomes not just an error but an internal |
| 391 | error. But that's a project for another day. */ |
| 392 | UNWIND_NULL_ID, |
| 393 | |
| 394 | /* All the conditions after this point are considered errors; |
| 395 | abnormal stack termination. If a backtrace stops for one |
| 396 | of these reasons, we'll let the user know. This marker |
| 397 | is not a valid stop reason. */ |
| 398 | UNWIND_FIRST_ERROR, |
| 399 | |
| 400 | /* This frame ID looks like it ought to belong to a NEXT frame, |
| 401 | but we got it for a PREV frame. Normally, this is a sign of |
| 402 | unwinder failure. It could also indicate stack corruption. */ |
| 403 | UNWIND_INNER_ID, |
| 404 | |
| 405 | /* This frame has the same ID as the previous one. That means |
| 406 | that unwinding further would almost certainly give us another |
| 407 | frame with exactly the same ID, so break the chain. Normally, |
| 408 | this is a sign of unwinder failure. It could also indicate |
| 409 | stack corruption. */ |
| 410 | UNWIND_SAME_ID, |
| 411 | |
| 412 | /* The frame unwinder didn't find any saved PC, but we needed |
| 413 | one to unwind further. */ |
| 414 | UNWIND_NO_SAVED_PC, |
| 415 | }; |
| 416 | |
| 417 | /* Return the reason why we can't unwind past this frame. */ |
| 418 | |
| 419 | enum unwind_stop_reason get_frame_unwind_stop_reason (struct frame_info *); |
| 420 | |
| 421 | /* Translate a reason code to an informative string. */ |
| 422 | |
| 423 | const char *frame_stop_reason_string (enum unwind_stop_reason); |
| 424 | |
| 425 | /* Unwind the stack frame so that the value of REGNUM, in the previous |
| 426 | (up, older) frame is returned. If VALUEP is NULL, don't |
| 427 | fetch/compute the value. Instead just return the location of the |
| 428 | value. */ |
| 429 | extern void frame_register_unwind (struct frame_info *frame, int regnum, |
| 430 | int *optimizedp, enum lval_type *lvalp, |
| 431 | CORE_ADDR *addrp, int *realnump, |
| 432 | gdb_byte *valuep); |
| 433 | |
| 434 | /* Fetch a register from this, or unwind a register from the next |
| 435 | frame. Note that the get_frame methods are wrappers to |
| 436 | frame->next->unwind. They all [potentially] throw an error if the |
| 437 | fetch fails. The value methods never return NULL, but usually |
| 438 | do return a lazy value. */ |
| 439 | |
| 440 | extern void frame_unwind_register (struct frame_info *frame, |
| 441 | int regnum, gdb_byte *buf); |
| 442 | extern void get_frame_register (struct frame_info *frame, |
| 443 | int regnum, gdb_byte *buf); |
| 444 | |
| 445 | struct value *frame_unwind_register_value (struct frame_info *frame, |
| 446 | int regnum); |
| 447 | struct value *get_frame_register_value (struct frame_info *frame, |
| 448 | int regnum); |
| 449 | |
| 450 | extern LONGEST frame_unwind_register_signed (struct frame_info *frame, |
| 451 | int regnum); |
| 452 | extern LONGEST get_frame_register_signed (struct frame_info *frame, |
| 453 | int regnum); |
| 454 | extern ULONGEST frame_unwind_register_unsigned (struct frame_info *frame, |
| 455 | int regnum); |
| 456 | extern ULONGEST get_frame_register_unsigned (struct frame_info *frame, |
| 457 | int regnum); |
| 458 | |
| 459 | |
| 460 | /* Get the value of the register that belongs to this FRAME. This |
| 461 | function is a wrapper to the call sequence ``frame_register_unwind |
| 462 | (get_next_frame (FRAME))''. As per frame_register_unwind(), if |
| 463 | VALUEP is NULL, the registers value is not fetched/computed. */ |
| 464 | |
| 465 | extern void frame_register (struct frame_info *frame, int regnum, |
| 466 | int *optimizedp, enum lval_type *lvalp, |
| 467 | CORE_ADDR *addrp, int *realnump, |
| 468 | gdb_byte *valuep); |
| 469 | |
| 470 | /* The reverse. Store a register value relative to the specified |
| 471 | frame. Note: this call makes the frame's state undefined. The |
| 472 | register and frame caches must be flushed. */ |
| 473 | extern void put_frame_register (struct frame_info *frame, int regnum, |
| 474 | const gdb_byte *buf); |
| 475 | |
| 476 | /* Read LEN bytes from one or multiple registers starting with REGNUM |
| 477 | in frame FRAME, starting at OFFSET, into BUF. */ |
| 478 | extern int get_frame_register_bytes (struct frame_info *frame, int regnum, |
| 479 | CORE_ADDR offset, int len, |
| 480 | gdb_byte *myaddr); |
| 481 | |
| 482 | /* Write LEN bytes to one or multiple registers starting with REGNUM |
| 483 | in frame FRAME, starting at OFFSET, into BUF. */ |
| 484 | extern void put_frame_register_bytes (struct frame_info *frame, int regnum, |
| 485 | CORE_ADDR offset, int len, |
| 486 | const gdb_byte *myaddr); |
| 487 | |
| 488 | /* Unwind the PC. Strictly speaking return the resume address of the |
| 489 | calling frame. For GDB, `pc' is the resume address and not a |
| 490 | specific register. */ |
| 491 | |
| 492 | extern CORE_ADDR frame_pc_unwind (struct frame_info *frame); |
| 493 | |
| 494 | /* Discard the specified frame. Restoring the registers to the state |
| 495 | of the caller. */ |
| 496 | extern void frame_pop (struct frame_info *frame); |
| 497 | |
| 498 | /* Return memory from the specified frame. A frame knows its thread / |
| 499 | LWP and hence can find its way down to a target. The assumption |
| 500 | here is that the current and previous frame share a common address |
| 501 | space. |
| 502 | |
| 503 | If the memory read fails, these methods throw an error. |
| 504 | |
| 505 | NOTE: cagney/2003-06-03: Should there be unwind versions of these |
| 506 | methods? That isn't clear. Can code, for instance, assume that |
| 507 | this and the previous frame's memory or architecture are identical? |
| 508 | If architecture / memory changes are always separated by special |
| 509 | adaptor frames this should be ok. */ |
| 510 | |
| 511 | extern void get_frame_memory (struct frame_info *this_frame, CORE_ADDR addr, |
| 512 | gdb_byte *buf, int len); |
| 513 | extern LONGEST get_frame_memory_signed (struct frame_info *this_frame, |
| 514 | CORE_ADDR memaddr, int len); |
| 515 | extern ULONGEST get_frame_memory_unsigned (struct frame_info *this_frame, |
| 516 | CORE_ADDR memaddr, int len); |
| 517 | |
| 518 | /* Same as above, but return non-zero when the entire memory read |
| 519 | succeeds, zero otherwize. */ |
| 520 | extern int safe_frame_unwind_memory (struct frame_info *this_frame, |
| 521 | CORE_ADDR addr, gdb_byte *buf, int len); |
| 522 | |
| 523 | /* Return this frame's architecture. */ |
| 524 | |
| 525 | extern struct gdbarch *get_frame_arch (struct frame_info *this_frame); |
| 526 | |
| 527 | |
| 528 | /* Values for the source flag to be used in print_frame_info_base(). */ |
| 529 | enum print_what |
| 530 | { |
| 531 | /* Print only the source line, like in stepi. */ |
| 532 | SRC_LINE = -1, |
| 533 | /* Print only the location, i.e. level, address (sometimes) |
| 534 | function, args, file, line, line num. */ |
| 535 | LOCATION, |
| 536 | /* Print both of the above. */ |
| 537 | SRC_AND_LOC, |
| 538 | /* Print location only, but always include the address. */ |
| 539 | LOC_AND_ADDRESS |
| 540 | }; |
| 541 | |
| 542 | /* Allocate zero initialized memory from the frame cache obstack. |
| 543 | Appendices to the frame info (such as the unwind cache) should |
| 544 | allocate memory using this method. */ |
| 545 | |
| 546 | extern void *frame_obstack_zalloc (unsigned long size); |
| 547 | #define FRAME_OBSTACK_ZALLOC(TYPE) ((TYPE *) frame_obstack_zalloc (sizeof (TYPE))) |
| 548 | #define FRAME_OBSTACK_CALLOC(NUMBER,TYPE) ((TYPE *) frame_obstack_zalloc ((NUMBER) * sizeof (TYPE))) |
| 549 | |
| 550 | /* Create a regcache, and copy the frame's registers into it. */ |
| 551 | struct regcache *frame_save_as_regcache (struct frame_info *this_frame); |
| 552 | |
| 553 | extern struct block *get_frame_block (struct frame_info *, |
| 554 | CORE_ADDR *addr_in_block); |
| 555 | |
| 556 | /* Return the `struct block' that belongs to the selected thread's |
| 557 | selected frame. If the inferior has no state, return NULL. |
| 558 | |
| 559 | NOTE: cagney/2002-11-29: |
| 560 | |
| 561 | No state? Does the inferior have any execution state (a core file |
| 562 | does, an executable does not). At present the code tests |
| 563 | `target_has_stack' but I'm left wondering if it should test |
| 564 | `target_has_registers' or, even, a merged target_has_state. |
| 565 | |
| 566 | Should it look at the most recently specified SAL? If the target |
| 567 | has no state, should this function try to extract a block from the |
| 568 | most recently selected SAL? That way `list foo' would give it some |
| 569 | sort of reference point. Then again, perhaps that would confuse |
| 570 | things. |
| 571 | |
| 572 | Calls to this function can be broken down into two categories: Code |
| 573 | that uses the selected block as an additional, but optional, data |
| 574 | point; Code that uses the selected block as a prop, when it should |
| 575 | have the relevant frame/block/pc explicitly passed in. |
| 576 | |
| 577 | The latter can be eliminated by correctly parameterizing the code, |
| 578 | the former though is more interesting. Per the "address" command, |
| 579 | it occurs in the CLI code and makes it possible for commands to |
| 580 | work, even when the inferior has no state. */ |
| 581 | |
| 582 | extern struct block *get_selected_block (CORE_ADDR *addr_in_block); |
| 583 | |
| 584 | extern struct symbol *get_frame_function (struct frame_info *); |
| 585 | |
| 586 | extern CORE_ADDR get_pc_function_start (CORE_ADDR); |
| 587 | |
| 588 | extern struct frame_info *find_relative_frame (struct frame_info *, int *); |
| 589 | |
| 590 | extern void show_and_print_stack_frame (struct frame_info *fi, int print_level, |
| 591 | enum print_what print_what); |
| 592 | |
| 593 | extern void print_stack_frame (struct frame_info *, int print_level, |
| 594 | enum print_what print_what); |
| 595 | |
| 596 | extern void print_frame_info (struct frame_info *, int print_level, |
| 597 | enum print_what print_what, int args); |
| 598 | |
| 599 | extern struct frame_info *block_innermost_frame (struct block *); |
| 600 | |
| 601 | extern int deprecated_pc_in_call_dummy (CORE_ADDR pc); |
| 602 | |
| 603 | /* FIXME: cagney/2003-02-02: Should be deprecated or replaced with a |
| 604 | function called get_frame_register_p(). This slightly weird (and |
| 605 | older) variant of get_frame_register() returns zero (indicating the |
| 606 | register is unavailable) if either: the register isn't cached; or |
| 607 | the register has been optimized out. Problem is, neither check is |
| 608 | exactly correct. A register can't be optimized out (it may not |
| 609 | have been saved as part of a function call); The fact that a |
| 610 | register isn't in the register cache doesn't mean that the register |
| 611 | isn't available (it could have been fetched from memory). */ |
| 612 | |
| 613 | extern int frame_register_read (struct frame_info *frame, int regnum, |
| 614 | gdb_byte *buf); |
| 615 | |
| 616 | /* From stack.c. */ |
| 617 | extern void args_info (char *, int); |
| 618 | |
| 619 | extern void locals_info (char *, int); |
| 620 | |
| 621 | extern void (*deprecated_selected_frame_level_changed_hook) (int); |
| 622 | |
| 623 | extern void return_command (char *, int); |
| 624 | |
| 625 | /* Set FRAME's unwinder temporarily, so that we can call a sniffer. |
| 626 | Return a cleanup which should be called if unwinding fails, and |
| 627 | discarded if it succeeds. */ |
| 628 | |
| 629 | struct cleanup *frame_prepare_for_sniffer (struct frame_info *frame, |
| 630 | const struct frame_unwind *unwind); |
| 631 | |
| 632 | /* Notes (cagney/2002-11-27, drow/2003-09-06): |
| 633 | |
| 634 | You might think that calls to this function can simply be replaced by a |
| 635 | call to get_selected_frame(). |
| 636 | |
| 637 | Unfortunately, it isn't that easy. |
| 638 | |
| 639 | The relevant code needs to be audited to determine if it is |
| 640 | possible (or practical) to instead pass the applicable frame in as a |
| 641 | parameter. For instance, DEPRECATED_DO_REGISTERS_INFO() relied on |
| 642 | the deprecated_selected_frame global, while its replacement, |
| 643 | PRINT_REGISTERS_INFO(), is parameterized with the selected frame. |
| 644 | The only real exceptions occur at the edge (in the CLI code) where |
| 645 | user commands need to pick up the selected frame before proceeding. |
| 646 | |
| 647 | There are also some functions called with a NULL frame meaning either "the |
| 648 | program is not running" or "use the selected frame". |
| 649 | |
| 650 | This is important. GDB is trying to stamp out the hack: |
| 651 | |
| 652 | saved_frame = deprecated_safe_get_selected_frame (); |
| 653 | select_frame (...); |
| 654 | hack_using_global_selected_frame (); |
| 655 | select_frame (saved_frame); |
| 656 | |
| 657 | Take care! |
| 658 | |
| 659 | This function calls get_selected_frame if the inferior should have a |
| 660 | frame, or returns NULL otherwise. */ |
| 661 | |
| 662 | extern struct frame_info *deprecated_safe_get_selected_frame (void); |
| 663 | |
| 664 | /* Create a frame using the specified BASE and PC. */ |
| 665 | |
| 666 | extern struct frame_info *create_new_frame (CORE_ADDR base, CORE_ADDR pc); |
| 667 | |
| 668 | #endif /* !defined (FRAME_H) */ |