| 1 | /* Perform an inferior function call, for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
| 4 | 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
| 5 | 2008, 2009, 2010, 2011 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 | #include "defs.h" |
| 23 | #include "breakpoint.h" |
| 24 | #include "tracepoint.h" |
| 25 | #include "target.h" |
| 26 | #include "regcache.h" |
| 27 | #include "inferior.h" |
| 28 | #include "gdb_assert.h" |
| 29 | #include "block.h" |
| 30 | #include "gdbcore.h" |
| 31 | #include "language.h" |
| 32 | #include "objfiles.h" |
| 33 | #include "gdbcmd.h" |
| 34 | #include "command.h" |
| 35 | #include "gdb_string.h" |
| 36 | #include "infcall.h" |
| 37 | #include "dummy-frame.h" |
| 38 | #include "ada-lang.h" |
| 39 | #include "gdbthread.h" |
| 40 | #include "exceptions.h" |
| 41 | |
| 42 | /* If we can't find a function's name from its address, |
| 43 | we print this instead. */ |
| 44 | #define RAW_FUNCTION_ADDRESS_FORMAT "at 0x%s" |
| 45 | #define RAW_FUNCTION_ADDRESS_SIZE (sizeof (RAW_FUNCTION_ADDRESS_FORMAT) \ |
| 46 | + 2 * sizeof (CORE_ADDR)) |
| 47 | |
| 48 | /* NOTE: cagney/2003-04-16: What's the future of this code? |
| 49 | |
| 50 | GDB needs an asynchronous expression evaluator, that means an |
| 51 | asynchronous inferior function call implementation, and that in |
| 52 | turn means restructuring the code so that it is event driven. */ |
| 53 | |
| 54 | /* How you should pass arguments to a function depends on whether it |
| 55 | was defined in K&R style or prototype style. If you define a |
| 56 | function using the K&R syntax that takes a `float' argument, then |
| 57 | callers must pass that argument as a `double'. If you define the |
| 58 | function using the prototype syntax, then you must pass the |
| 59 | argument as a `float', with no promotion. |
| 60 | |
| 61 | Unfortunately, on certain older platforms, the debug info doesn't |
| 62 | indicate reliably how each function was defined. A function type's |
| 63 | TYPE_FLAG_PROTOTYPED flag may be clear, even if the function was |
| 64 | defined in prototype style. When calling a function whose |
| 65 | TYPE_FLAG_PROTOTYPED flag is clear, GDB consults this flag to |
| 66 | decide what to do. |
| 67 | |
| 68 | For modern targets, it is proper to assume that, if the prototype |
| 69 | flag is clear, that can be trusted: `float' arguments should be |
| 70 | promoted to `double'. For some older targets, if the prototype |
| 71 | flag is clear, that doesn't tell us anything. The default is to |
| 72 | trust the debug information; the user can override this behavior |
| 73 | with "set coerce-float-to-double 0". */ |
| 74 | |
| 75 | static int coerce_float_to_double_p = 1; |
| 76 | static void |
| 77 | show_coerce_float_to_double_p (struct ui_file *file, int from_tty, |
| 78 | struct cmd_list_element *c, const char *value) |
| 79 | { |
| 80 | fprintf_filtered (file, |
| 81 | _("Coercion of floats to doubles " |
| 82 | "when calling functions is %s.\n"), |
| 83 | value); |
| 84 | } |
| 85 | |
| 86 | /* This boolean tells what gdb should do if a signal is received while |
| 87 | in a function called from gdb (call dummy). If set, gdb unwinds |
| 88 | the stack and restore the context to what as it was before the |
| 89 | call. |
| 90 | |
| 91 | The default is to stop in the frame where the signal was received. */ |
| 92 | |
| 93 | int unwind_on_signal_p = 0; |
| 94 | static void |
| 95 | show_unwind_on_signal_p (struct ui_file *file, int from_tty, |
| 96 | struct cmd_list_element *c, const char *value) |
| 97 | { |
| 98 | fprintf_filtered (file, |
| 99 | _("Unwinding of stack if a signal is " |
| 100 | "received while in a call dummy is %s.\n"), |
| 101 | value); |
| 102 | } |
| 103 | |
| 104 | /* This boolean tells what gdb should do if a std::terminate call is |
| 105 | made while in a function called from gdb (call dummy). |
| 106 | As the confines of a single dummy stack prohibit out-of-frame |
| 107 | handlers from handling a raised exception, and as out-of-frame |
| 108 | handlers are common in C++, this can lead to no handler being found |
| 109 | by the unwinder, and a std::terminate call. This is a false positive. |
| 110 | If set, gdb unwinds the stack and restores the context to what it |
| 111 | was before the call. |
| 112 | |
| 113 | The default is to unwind the frame if a std::terminate call is |
| 114 | made. */ |
| 115 | |
| 116 | static int unwind_on_terminating_exception_p = 1; |
| 117 | |
| 118 | static void |
| 119 | show_unwind_on_terminating_exception_p (struct ui_file *file, int from_tty, |
| 120 | struct cmd_list_element *c, |
| 121 | const char *value) |
| 122 | |
| 123 | { |
| 124 | fprintf_filtered (file, |
| 125 | _("Unwind stack if a C++ exception is " |
| 126 | "unhandled while in a call dummy is %s.\n"), |
| 127 | value); |
| 128 | } |
| 129 | |
| 130 | /* Perform the standard coercions that are specified |
| 131 | for arguments to be passed to C or Ada functions. |
| 132 | |
| 133 | If PARAM_TYPE is non-NULL, it is the expected parameter type. |
| 134 | IS_PROTOTYPED is non-zero if the function declaration is prototyped. |
| 135 | SP is the stack pointer were additional data can be pushed (updating |
| 136 | its value as needed). */ |
| 137 | |
| 138 | static struct value * |
| 139 | value_arg_coerce (struct gdbarch *gdbarch, struct value *arg, |
| 140 | struct type *param_type, int is_prototyped, CORE_ADDR *sp) |
| 141 | { |
| 142 | const struct builtin_type *builtin = builtin_type (gdbarch); |
| 143 | struct type *arg_type = check_typedef (value_type (arg)); |
| 144 | struct type *type |
| 145 | = param_type ? check_typedef (param_type) : arg_type; |
| 146 | |
| 147 | /* Perform any Ada-specific coercion first. */ |
| 148 | if (current_language->la_language == language_ada) |
| 149 | arg = ada_convert_actual (arg, type); |
| 150 | |
| 151 | /* Force the value to the target if we will need its address. At |
| 152 | this point, we could allocate arguments on the stack instead of |
| 153 | calling malloc if we knew that their addresses would not be |
| 154 | saved by the called function. */ |
| 155 | arg = value_coerce_to_target (arg); |
| 156 | |
| 157 | switch (TYPE_CODE (type)) |
| 158 | { |
| 159 | case TYPE_CODE_REF: |
| 160 | { |
| 161 | struct value *new_value; |
| 162 | |
| 163 | if (TYPE_CODE (arg_type) == TYPE_CODE_REF) |
| 164 | return value_cast_pointers (type, arg); |
| 165 | |
| 166 | /* Cast the value to the reference's target type, and then |
| 167 | convert it back to a reference. This will issue an error |
| 168 | if the value was not previously in memory - in some cases |
| 169 | we should clearly be allowing this, but how? */ |
| 170 | new_value = value_cast (TYPE_TARGET_TYPE (type), arg); |
| 171 | new_value = value_ref (new_value); |
| 172 | return new_value; |
| 173 | } |
| 174 | case TYPE_CODE_INT: |
| 175 | case TYPE_CODE_CHAR: |
| 176 | case TYPE_CODE_BOOL: |
| 177 | case TYPE_CODE_ENUM: |
| 178 | /* If we don't have a prototype, coerce to integer type if necessary. */ |
| 179 | if (!is_prototyped) |
| 180 | { |
| 181 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int)) |
| 182 | type = builtin->builtin_int; |
| 183 | } |
| 184 | /* Currently all target ABIs require at least the width of an integer |
| 185 | type for an argument. We may have to conditionalize the following |
| 186 | type coercion for future targets. */ |
| 187 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int)) |
| 188 | type = builtin->builtin_int; |
| 189 | break; |
| 190 | case TYPE_CODE_FLT: |
| 191 | if (!is_prototyped && coerce_float_to_double_p) |
| 192 | { |
| 193 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_double)) |
| 194 | type = builtin->builtin_double; |
| 195 | else if (TYPE_LENGTH (type) > TYPE_LENGTH (builtin->builtin_double)) |
| 196 | type = builtin->builtin_long_double; |
| 197 | } |
| 198 | break; |
| 199 | case TYPE_CODE_FUNC: |
| 200 | type = lookup_pointer_type (type); |
| 201 | break; |
| 202 | case TYPE_CODE_ARRAY: |
| 203 | /* Arrays are coerced to pointers to their first element, unless |
| 204 | they are vectors, in which case we want to leave them alone, |
| 205 | because they are passed by value. */ |
| 206 | if (current_language->c_style_arrays) |
| 207 | if (!TYPE_VECTOR (type)) |
| 208 | type = lookup_pointer_type (TYPE_TARGET_TYPE (type)); |
| 209 | break; |
| 210 | case TYPE_CODE_UNDEF: |
| 211 | case TYPE_CODE_PTR: |
| 212 | case TYPE_CODE_STRUCT: |
| 213 | case TYPE_CODE_UNION: |
| 214 | case TYPE_CODE_VOID: |
| 215 | case TYPE_CODE_SET: |
| 216 | case TYPE_CODE_RANGE: |
| 217 | case TYPE_CODE_STRING: |
| 218 | case TYPE_CODE_BITSTRING: |
| 219 | case TYPE_CODE_ERROR: |
| 220 | case TYPE_CODE_MEMBERPTR: |
| 221 | case TYPE_CODE_METHODPTR: |
| 222 | case TYPE_CODE_METHOD: |
| 223 | case TYPE_CODE_COMPLEX: |
| 224 | default: |
| 225 | break; |
| 226 | } |
| 227 | |
| 228 | return value_cast (type, arg); |
| 229 | } |
| 230 | |
| 231 | /* Return the return type of a function with its first instruction exactly at |
| 232 | the PC address. Return NULL otherwise. */ |
| 233 | |
| 234 | static struct type * |
| 235 | find_function_return_type (CORE_ADDR pc) |
| 236 | { |
| 237 | struct symbol *sym = find_pc_function (pc); |
| 238 | |
| 239 | if (sym != NULL && BLOCK_START (SYMBOL_BLOCK_VALUE (sym)) == pc |
| 240 | && SYMBOL_TYPE (sym) != NULL) |
| 241 | return TYPE_TARGET_TYPE (SYMBOL_TYPE (sym)); |
| 242 | |
| 243 | return NULL; |
| 244 | } |
| 245 | |
| 246 | /* Determine a function's address and its return type from its value. |
| 247 | Calls error() if the function is not valid for calling. */ |
| 248 | |
| 249 | CORE_ADDR |
| 250 | find_function_addr (struct value *function, struct type **retval_type) |
| 251 | { |
| 252 | struct type *ftype = check_typedef (value_type (function)); |
| 253 | struct gdbarch *gdbarch = get_type_arch (ftype); |
| 254 | struct type *value_type = NULL; |
| 255 | /* Initialize it just to avoid a GCC false warning. */ |
| 256 | CORE_ADDR funaddr = 0; |
| 257 | |
| 258 | /* If it's a member function, just look at the function |
| 259 | part of it. */ |
| 260 | |
| 261 | /* Determine address to call. */ |
| 262 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC |
| 263 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) |
| 264 | funaddr = value_address (function); |
| 265 | else if (TYPE_CODE (ftype) == TYPE_CODE_PTR) |
| 266 | { |
| 267 | funaddr = value_as_address (function); |
| 268 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); |
| 269 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC |
| 270 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) |
| 271 | funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr, |
| 272 | ¤t_target); |
| 273 | } |
| 274 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC |
| 275 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) |
| 276 | { |
| 277 | value_type = TYPE_TARGET_TYPE (ftype); |
| 278 | |
| 279 | if (TYPE_GNU_IFUNC (ftype)) |
| 280 | { |
| 281 | funaddr = gnu_ifunc_resolve_addr (gdbarch, funaddr); |
| 282 | |
| 283 | /* Skip querying the function symbol if no RETVAL_TYPE has been |
| 284 | asked for. */ |
| 285 | if (retval_type) |
| 286 | value_type = find_function_return_type (funaddr); |
| 287 | } |
| 288 | } |
| 289 | else if (TYPE_CODE (ftype) == TYPE_CODE_INT) |
| 290 | { |
| 291 | /* Handle the case of functions lacking debugging info. |
| 292 | Their values are characters since their addresses are char. */ |
| 293 | if (TYPE_LENGTH (ftype) == 1) |
| 294 | funaddr = value_as_address (value_addr (function)); |
| 295 | else |
| 296 | { |
| 297 | /* Handle function descriptors lacking debug info. */ |
| 298 | int found_descriptor = 0; |
| 299 | |
| 300 | funaddr = 0; /* pacify "gcc -Werror" */ |
| 301 | if (VALUE_LVAL (function) == lval_memory) |
| 302 | { |
| 303 | CORE_ADDR nfunaddr; |
| 304 | |
| 305 | funaddr = value_as_address (value_addr (function)); |
| 306 | nfunaddr = funaddr; |
| 307 | funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr, |
| 308 | ¤t_target); |
| 309 | if (funaddr != nfunaddr) |
| 310 | found_descriptor = 1; |
| 311 | } |
| 312 | if (!found_descriptor) |
| 313 | /* Handle integer used as address of a function. */ |
| 314 | funaddr = (CORE_ADDR) value_as_long (function); |
| 315 | } |
| 316 | } |
| 317 | else |
| 318 | error (_("Invalid data type for function to be called.")); |
| 319 | |
| 320 | if (retval_type != NULL) |
| 321 | *retval_type = value_type; |
| 322 | return funaddr + gdbarch_deprecated_function_start_offset (gdbarch); |
| 323 | } |
| 324 | |
| 325 | /* For CALL_DUMMY_ON_STACK, push a breakpoint sequence that the called |
| 326 | function returns to. */ |
| 327 | |
| 328 | static CORE_ADDR |
| 329 | push_dummy_code (struct gdbarch *gdbarch, |
| 330 | CORE_ADDR sp, CORE_ADDR funaddr, |
| 331 | struct value **args, int nargs, |
| 332 | struct type *value_type, |
| 333 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr, |
| 334 | struct regcache *regcache) |
| 335 | { |
| 336 | gdb_assert (gdbarch_push_dummy_code_p (gdbarch)); |
| 337 | |
| 338 | return gdbarch_push_dummy_code (gdbarch, sp, funaddr, |
| 339 | args, nargs, value_type, real_pc, bp_addr, |
| 340 | regcache); |
| 341 | } |
| 342 | |
| 343 | /* Fetch the name of the function at FUNADDR. |
| 344 | This is used in printing an error message for call_function_by_hand. |
| 345 | BUF is used to print FUNADDR in hex if the function name cannot be |
| 346 | determined. It must be large enough to hold formatted result of |
| 347 | RAW_FUNCTION_ADDRESS_FORMAT. */ |
| 348 | |
| 349 | static const char * |
| 350 | get_function_name (CORE_ADDR funaddr, char *buf, int buf_size) |
| 351 | { |
| 352 | { |
| 353 | struct symbol *symbol = find_pc_function (funaddr); |
| 354 | |
| 355 | if (symbol) |
| 356 | return SYMBOL_PRINT_NAME (symbol); |
| 357 | } |
| 358 | |
| 359 | { |
| 360 | /* Try the minimal symbols. */ |
| 361 | struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (funaddr); |
| 362 | |
| 363 | if (msymbol) |
| 364 | return SYMBOL_PRINT_NAME (msymbol); |
| 365 | } |
| 366 | |
| 367 | { |
| 368 | char *tmp = xstrprintf (_(RAW_FUNCTION_ADDRESS_FORMAT), |
| 369 | hex_string (funaddr)); |
| 370 | |
| 371 | gdb_assert (strlen (tmp) + 1 <= buf_size); |
| 372 | strcpy (buf, tmp); |
| 373 | xfree (tmp); |
| 374 | return buf; |
| 375 | } |
| 376 | } |
| 377 | |
| 378 | /* Subroutine of call_function_by_hand to simplify it. |
| 379 | Start up the inferior and wait for it to stop. |
| 380 | Return the exception if there's an error, or an exception with |
| 381 | reason >= 0 if there's no error. |
| 382 | |
| 383 | This is done inside a TRY_CATCH so the caller needn't worry about |
| 384 | thrown errors. The caller should rethrow if there's an error. */ |
| 385 | |
| 386 | static struct gdb_exception |
| 387 | run_inferior_call (struct thread_info *call_thread, CORE_ADDR real_pc) |
| 388 | { |
| 389 | volatile struct gdb_exception e; |
| 390 | int saved_async = 0; |
| 391 | int saved_in_infcall = call_thread->control.in_infcall; |
| 392 | ptid_t call_thread_ptid = call_thread->ptid; |
| 393 | char *saved_target_shortname = xstrdup (target_shortname); |
| 394 | |
| 395 | call_thread->control.in_infcall = 1; |
| 396 | |
| 397 | clear_proceed_status (); |
| 398 | |
| 399 | disable_watchpoints_before_interactive_call_start (); |
| 400 | |
| 401 | /* We want stop_registers, please... */ |
| 402 | call_thread->control.proceed_to_finish = 1; |
| 403 | |
| 404 | if (target_can_async_p ()) |
| 405 | saved_async = target_async_mask (0); |
| 406 | |
| 407 | TRY_CATCH (e, RETURN_MASK_ALL) |
| 408 | proceed (real_pc, TARGET_SIGNAL_0, 0); |
| 409 | |
| 410 | /* At this point the current thread may have changed. Refresh |
| 411 | CALL_THREAD as it could be invalid if its thread has exited. */ |
| 412 | call_thread = find_thread_ptid (call_thread_ptid); |
| 413 | |
| 414 | /* Don't restore the async mask if the target has changed, |
| 415 | saved_async is for the original target. */ |
| 416 | if (saved_async |
| 417 | && strcmp (saved_target_shortname, target_shortname) == 0) |
| 418 | target_async_mask (saved_async); |
| 419 | |
| 420 | enable_watchpoints_after_interactive_call_stop (); |
| 421 | |
| 422 | /* Call breakpoint_auto_delete on the current contents of the bpstat |
| 423 | of inferior call thread. |
| 424 | If all error()s out of proceed ended up calling normal_stop |
| 425 | (and perhaps they should; it already does in the special case |
| 426 | of error out of resume()), then we wouldn't need this. */ |
| 427 | if (e.reason < 0) |
| 428 | { |
| 429 | if (call_thread != NULL) |
| 430 | breakpoint_auto_delete (call_thread->control.stop_bpstat); |
| 431 | } |
| 432 | |
| 433 | if (call_thread != NULL) |
| 434 | call_thread->control.in_infcall = saved_in_infcall; |
| 435 | |
| 436 | xfree (saved_target_shortname); |
| 437 | |
| 438 | return e; |
| 439 | } |
| 440 | |
| 441 | /* A cleanup function that calls delete_std_terminate_breakpoint. */ |
| 442 | static void |
| 443 | cleanup_delete_std_terminate_breakpoint (void *ignore) |
| 444 | { |
| 445 | delete_std_terminate_breakpoint (); |
| 446 | } |
| 447 | |
| 448 | /* All this stuff with a dummy frame may seem unnecessarily complicated |
| 449 | (why not just save registers in GDB?). The purpose of pushing a dummy |
| 450 | frame which looks just like a real frame is so that if you call a |
| 451 | function and then hit a breakpoint (get a signal, etc), "backtrace" |
| 452 | will look right. Whether the backtrace needs to actually show the |
| 453 | stack at the time the inferior function was called is debatable, but |
| 454 | it certainly needs to not display garbage. So if you are contemplating |
| 455 | making dummy frames be different from normal frames, consider that. */ |
| 456 | |
| 457 | /* Perform a function call in the inferior. |
| 458 | ARGS is a vector of values of arguments (NARGS of them). |
| 459 | FUNCTION is a value, the function to be called. |
| 460 | Returns a value representing what the function returned. |
| 461 | May fail to return, if a breakpoint or signal is hit |
| 462 | during the execution of the function. |
| 463 | |
| 464 | ARGS is modified to contain coerced values. */ |
| 465 | |
| 466 | struct value * |
| 467 | call_function_by_hand (struct value *function, int nargs, struct value **args) |
| 468 | { |
| 469 | CORE_ADDR sp; |
| 470 | struct type *values_type, *target_values_type; |
| 471 | unsigned char struct_return = 0, lang_struct_return = 0; |
| 472 | CORE_ADDR struct_addr = 0; |
| 473 | struct infcall_control_state *inf_status; |
| 474 | struct cleanup *inf_status_cleanup; |
| 475 | struct infcall_suspend_state *caller_state; |
| 476 | CORE_ADDR funaddr; |
| 477 | CORE_ADDR real_pc; |
| 478 | struct type *ftype = check_typedef (value_type (function)); |
| 479 | CORE_ADDR bp_addr; |
| 480 | struct frame_id dummy_id; |
| 481 | struct cleanup *args_cleanup; |
| 482 | struct frame_info *frame; |
| 483 | struct gdbarch *gdbarch; |
| 484 | struct cleanup *terminate_bp_cleanup; |
| 485 | ptid_t call_thread_ptid; |
| 486 | struct gdb_exception e; |
| 487 | char name_buf[RAW_FUNCTION_ADDRESS_SIZE]; |
| 488 | |
| 489 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) |
| 490 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); |
| 491 | |
| 492 | if (!target_has_execution) |
| 493 | noprocess (); |
| 494 | |
| 495 | if (get_traceframe_number () >= 0) |
| 496 | error (_("May not call functions while looking at trace frames.")); |
| 497 | |
| 498 | frame = get_current_frame (); |
| 499 | gdbarch = get_frame_arch (frame); |
| 500 | |
| 501 | if (!gdbarch_push_dummy_call_p (gdbarch)) |
| 502 | error (_("This target does not support function calls.")); |
| 503 | |
| 504 | /* A cleanup for the inferior status. |
| 505 | This is only needed while we're preparing the inferior function call. */ |
| 506 | inf_status = save_infcall_control_state (); |
| 507 | inf_status_cleanup |
| 508 | = make_cleanup_restore_infcall_control_state (inf_status); |
| 509 | |
| 510 | /* Save the caller's registers and other state associated with the |
| 511 | inferior itself so that they can be restored once the |
| 512 | callee returns. To allow nested calls the registers are (further |
| 513 | down) pushed onto a dummy frame stack. Include a cleanup (which |
| 514 | is tossed once the regcache has been pushed). */ |
| 515 | caller_state = save_infcall_suspend_state (); |
| 516 | make_cleanup_restore_infcall_suspend_state (caller_state); |
| 517 | |
| 518 | /* Ensure that the initial SP is correctly aligned. */ |
| 519 | { |
| 520 | CORE_ADDR old_sp = get_frame_sp (frame); |
| 521 | |
| 522 | if (gdbarch_frame_align_p (gdbarch)) |
| 523 | { |
| 524 | sp = gdbarch_frame_align (gdbarch, old_sp); |
| 525 | /* NOTE: cagney/2003-08-13: Skip the "red zone". For some |
| 526 | ABIs, a function can use memory beyond the inner most stack |
| 527 | address. AMD64 called that region the "red zone". Skip at |
| 528 | least the "red zone" size before allocating any space on |
| 529 | the stack. */ |
| 530 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
| 531 | sp -= gdbarch_frame_red_zone_size (gdbarch); |
| 532 | else |
| 533 | sp += gdbarch_frame_red_zone_size (gdbarch); |
| 534 | /* Still aligned? */ |
| 535 | gdb_assert (sp == gdbarch_frame_align (gdbarch, sp)); |
| 536 | /* NOTE: cagney/2002-09-18: |
| 537 | |
| 538 | On a RISC architecture, a void parameterless generic dummy |
| 539 | frame (i.e., no parameters, no result) typically does not |
| 540 | need to push anything the stack and hence can leave SP and |
| 541 | FP. Similarly, a frameless (possibly leaf) function does |
| 542 | not push anything on the stack and, hence, that too can |
| 543 | leave FP and SP unchanged. As a consequence, a sequence of |
| 544 | void parameterless generic dummy frame calls to frameless |
| 545 | functions will create a sequence of effectively identical |
| 546 | frames (SP, FP and TOS and PC the same). This, not |
| 547 | suprisingly, results in what appears to be a stack in an |
| 548 | infinite loop --- when GDB tries to find a generic dummy |
| 549 | frame on the internal dummy frame stack, it will always |
| 550 | find the first one. |
| 551 | |
| 552 | To avoid this problem, the code below always grows the |
| 553 | stack. That way, two dummy frames can never be identical. |
| 554 | It does burn a few bytes of stack but that is a small price |
| 555 | to pay :-). */ |
| 556 | if (sp == old_sp) |
| 557 | { |
| 558 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
| 559 | /* Stack grows down. */ |
| 560 | sp = gdbarch_frame_align (gdbarch, old_sp - 1); |
| 561 | else |
| 562 | /* Stack grows up. */ |
| 563 | sp = gdbarch_frame_align (gdbarch, old_sp + 1); |
| 564 | } |
| 565 | /* SP may have underflown address zero here from OLD_SP. Memory access |
| 566 | functions will probably fail in such case but that is a target's |
| 567 | problem. */ |
| 568 | } |
| 569 | else |
| 570 | /* FIXME: cagney/2002-09-18: Hey, you loose! |
| 571 | |
| 572 | Who knows how badly aligned the SP is! |
| 573 | |
| 574 | If the generic dummy frame ends up empty (because nothing is |
| 575 | pushed) GDB won't be able to correctly perform back traces. |
| 576 | If a target is having trouble with backtraces, first thing to |
| 577 | do is add FRAME_ALIGN() to the architecture vector. If that |
| 578 | fails, try dummy_id(). |
| 579 | |
| 580 | If the ABI specifies a "Red Zone" (see the doco) the code |
| 581 | below will quietly trash it. */ |
| 582 | sp = old_sp; |
| 583 | } |
| 584 | |
| 585 | funaddr = find_function_addr (function, &values_type); |
| 586 | if (!values_type) |
| 587 | values_type = builtin_type (gdbarch)->builtin_int; |
| 588 | |
| 589 | CHECK_TYPEDEF (values_type); |
| 590 | |
| 591 | /* Are we returning a value using a structure return (passing a |
| 592 | hidden argument pointing to storage) or a normal value return? |
| 593 | There are two cases: language-mandated structure return and |
| 594 | target ABI structure return. The variable STRUCT_RETURN only |
| 595 | describes the latter. The language version is handled by passing |
| 596 | the return location as the first parameter to the function, |
| 597 | even preceding "this". This is different from the target |
| 598 | ABI version, which is target-specific; for instance, on ia64 |
| 599 | the first argument is passed in out0 but the hidden structure |
| 600 | return pointer would normally be passed in r8. */ |
| 601 | |
| 602 | if (language_pass_by_reference (values_type)) |
| 603 | { |
| 604 | lang_struct_return = 1; |
| 605 | |
| 606 | /* Tell the target specific argument pushing routine not to |
| 607 | expect a value. */ |
| 608 | target_values_type = builtin_type (gdbarch)->builtin_void; |
| 609 | } |
| 610 | else |
| 611 | { |
| 612 | struct_return = using_struct_return (gdbarch, |
| 613 | value_type (function), values_type); |
| 614 | target_values_type = values_type; |
| 615 | } |
| 616 | |
| 617 | /* Determine the location of the breakpoint (and possibly other |
| 618 | stuff) that the called function will return to. The SPARC, for a |
| 619 | function returning a structure or union, needs to make space for |
| 620 | not just the breakpoint but also an extra word containing the |
| 621 | size (?) of the structure being passed. */ |
| 622 | |
| 623 | /* The actual breakpoint (at BP_ADDR) is inserted separatly so there |
| 624 | is no need to write that out. */ |
| 625 | |
| 626 | switch (gdbarch_call_dummy_location (gdbarch)) |
| 627 | { |
| 628 | case ON_STACK: |
| 629 | sp = push_dummy_code (gdbarch, sp, funaddr, |
| 630 | args, nargs, target_values_type, |
| 631 | &real_pc, &bp_addr, get_current_regcache ()); |
| 632 | break; |
| 633 | case AT_ENTRY_POINT: |
| 634 | { |
| 635 | CORE_ADDR dummy_addr; |
| 636 | |
| 637 | real_pc = funaddr; |
| 638 | dummy_addr = entry_point_address (); |
| 639 | /* A call dummy always consists of just a single breakpoint, so |
| 640 | its address is the same as the address of the dummy. */ |
| 641 | bp_addr = dummy_addr; |
| 642 | break; |
| 643 | } |
| 644 | case AT_SYMBOL: |
| 645 | /* Some executables define a symbol __CALL_DUMMY_ADDRESS whose |
| 646 | address is the location where the breakpoint should be |
| 647 | placed. Once all targets are using the overhauled frame code |
| 648 | this can be deleted - ON_STACK is a better option. */ |
| 649 | { |
| 650 | struct minimal_symbol *sym; |
| 651 | CORE_ADDR dummy_addr; |
| 652 | |
| 653 | sym = lookup_minimal_symbol ("__CALL_DUMMY_ADDRESS", NULL, NULL); |
| 654 | real_pc = funaddr; |
| 655 | if (sym) |
| 656 | { |
| 657 | dummy_addr = SYMBOL_VALUE_ADDRESS (sym); |
| 658 | /* Make certain that the address points at real code, and not |
| 659 | a function descriptor. */ |
| 660 | dummy_addr = gdbarch_convert_from_func_ptr_addr (gdbarch, |
| 661 | dummy_addr, |
| 662 | ¤t_target); |
| 663 | } |
| 664 | else |
| 665 | dummy_addr = entry_point_address (); |
| 666 | /* A call dummy always consists of just a single breakpoint, |
| 667 | so it's address is the same as the address of the dummy. */ |
| 668 | bp_addr = dummy_addr; |
| 669 | break; |
| 670 | } |
| 671 | default: |
| 672 | internal_error (__FILE__, __LINE__, _("bad switch")); |
| 673 | } |
| 674 | |
| 675 | if (nargs < TYPE_NFIELDS (ftype)) |
| 676 | error (_("Too few arguments in function call.")); |
| 677 | |
| 678 | { |
| 679 | int i; |
| 680 | |
| 681 | for (i = nargs - 1; i >= 0; i--) |
| 682 | { |
| 683 | int prototyped; |
| 684 | struct type *param_type; |
| 685 | |
| 686 | /* FIXME drow/2002-05-31: Should just always mark methods as |
| 687 | prototyped. Can we respect TYPE_VARARGS? Probably not. */ |
| 688 | if (TYPE_CODE (ftype) == TYPE_CODE_METHOD) |
| 689 | prototyped = 1; |
| 690 | else if (i < TYPE_NFIELDS (ftype)) |
| 691 | prototyped = TYPE_PROTOTYPED (ftype); |
| 692 | else |
| 693 | prototyped = 0; |
| 694 | |
| 695 | if (i < TYPE_NFIELDS (ftype)) |
| 696 | param_type = TYPE_FIELD_TYPE (ftype, i); |
| 697 | else |
| 698 | param_type = NULL; |
| 699 | |
| 700 | args[i] = value_arg_coerce (gdbarch, args[i], |
| 701 | param_type, prototyped, &sp); |
| 702 | |
| 703 | if (param_type != NULL && language_pass_by_reference (param_type)) |
| 704 | args[i] = value_addr (args[i]); |
| 705 | } |
| 706 | } |
| 707 | |
| 708 | /* Reserve space for the return structure to be written on the |
| 709 | stack, if necessary. Make certain that the value is correctly |
| 710 | aligned. */ |
| 711 | |
| 712 | if (struct_return || lang_struct_return) |
| 713 | { |
| 714 | int len = TYPE_LENGTH (values_type); |
| 715 | |
| 716 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
| 717 | { |
| 718 | /* Stack grows downward. Align STRUCT_ADDR and SP after |
| 719 | making space for the return value. */ |
| 720 | sp -= len; |
| 721 | if (gdbarch_frame_align_p (gdbarch)) |
| 722 | sp = gdbarch_frame_align (gdbarch, sp); |
| 723 | struct_addr = sp; |
| 724 | } |
| 725 | else |
| 726 | { |
| 727 | /* Stack grows upward. Align the frame, allocate space, and |
| 728 | then again, re-align the frame??? */ |
| 729 | if (gdbarch_frame_align_p (gdbarch)) |
| 730 | sp = gdbarch_frame_align (gdbarch, sp); |
| 731 | struct_addr = sp; |
| 732 | sp += len; |
| 733 | if (gdbarch_frame_align_p (gdbarch)) |
| 734 | sp = gdbarch_frame_align (gdbarch, sp); |
| 735 | } |
| 736 | } |
| 737 | |
| 738 | if (lang_struct_return) |
| 739 | { |
| 740 | struct value **new_args; |
| 741 | |
| 742 | /* Add the new argument to the front of the argument list. */ |
| 743 | new_args = xmalloc (sizeof (struct value *) * (nargs + 1)); |
| 744 | new_args[0] = value_from_pointer (lookup_pointer_type (values_type), |
| 745 | struct_addr); |
| 746 | memcpy (&new_args[1], &args[0], sizeof (struct value *) * nargs); |
| 747 | args = new_args; |
| 748 | nargs++; |
| 749 | args_cleanup = make_cleanup (xfree, args); |
| 750 | } |
| 751 | else |
| 752 | args_cleanup = make_cleanup (null_cleanup, NULL); |
| 753 | |
| 754 | /* Create the dummy stack frame. Pass in the call dummy address as, |
| 755 | presumably, the ABI code knows where, in the call dummy, the |
| 756 | return address should be pointed. */ |
| 757 | sp = gdbarch_push_dummy_call (gdbarch, function, get_current_regcache (), |
| 758 | bp_addr, nargs, args, |
| 759 | sp, struct_return, struct_addr); |
| 760 | |
| 761 | do_cleanups (args_cleanup); |
| 762 | |
| 763 | /* Set up a frame ID for the dummy frame so we can pass it to |
| 764 | set_momentary_breakpoint. We need to give the breakpoint a frame |
| 765 | ID so that the breakpoint code can correctly re-identify the |
| 766 | dummy breakpoint. */ |
| 767 | /* Sanity. The exact same SP value is returned by PUSH_DUMMY_CALL, |
| 768 | saved as the dummy-frame TOS, and used by dummy_id to form |
| 769 | the frame ID's stack address. */ |
| 770 | dummy_id = frame_id_build (sp, bp_addr); |
| 771 | |
| 772 | /* Create a momentary breakpoint at the return address of the |
| 773 | inferior. That way it breaks when it returns. */ |
| 774 | |
| 775 | { |
| 776 | struct breakpoint *bpt; |
| 777 | struct symtab_and_line sal; |
| 778 | |
| 779 | init_sal (&sal); /* initialize to zeroes */ |
| 780 | sal.pspace = current_program_space; |
| 781 | sal.pc = bp_addr; |
| 782 | sal.section = find_pc_overlay (sal.pc); |
| 783 | /* Sanity. The exact same SP value is returned by |
| 784 | PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by |
| 785 | dummy_id to form the frame ID's stack address. */ |
| 786 | bpt = set_momentary_breakpoint (gdbarch, sal, dummy_id, bp_call_dummy); |
| 787 | bpt->disposition = disp_del; |
| 788 | } |
| 789 | |
| 790 | /* Create a breakpoint in std::terminate. |
| 791 | If a C++ exception is raised in the dummy-frame, and the |
| 792 | exception handler is (normally, and expected to be) out-of-frame, |
| 793 | the default C++ handler will (wrongly) be called in an inferior |
| 794 | function call. This is wrong, as an exception can be normally |
| 795 | and legally handled out-of-frame. The confines of the dummy frame |
| 796 | prevent the unwinder from finding the correct handler (or any |
| 797 | handler, unless it is in-frame). The default handler calls |
| 798 | std::terminate. This will kill the inferior. Assert that |
| 799 | terminate should never be called in an inferior function |
| 800 | call. Place a momentary breakpoint in the std::terminate function |
| 801 | and if triggered in the call, rewind. */ |
| 802 | if (unwind_on_terminating_exception_p) |
| 803 | set_std_terminate_breakpoint (); |
| 804 | |
| 805 | /* Everything's ready, push all the info needed to restore the |
| 806 | caller (and identify the dummy-frame) onto the dummy-frame |
| 807 | stack. */ |
| 808 | dummy_frame_push (caller_state, &dummy_id); |
| 809 | |
| 810 | /* Discard both inf_status and caller_state cleanups. |
| 811 | From this point on we explicitly restore the associated state |
| 812 | or discard it. */ |
| 813 | discard_cleanups (inf_status_cleanup); |
| 814 | |
| 815 | /* Register a clean-up for unwind_on_terminating_exception_breakpoint. */ |
| 816 | terminate_bp_cleanup = make_cleanup (cleanup_delete_std_terminate_breakpoint, |
| 817 | NULL); |
| 818 | |
| 819 | /* - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - |
| 820 | If you're looking to implement asynchronous dummy-frames, then |
| 821 | just below is the place to chop this function in two.. */ |
| 822 | |
| 823 | /* TP is invalid after run_inferior_call returns, so enclose this |
| 824 | in a block so that it's only in scope during the time it's valid. */ |
| 825 | { |
| 826 | struct thread_info *tp = inferior_thread (); |
| 827 | |
| 828 | /* Save this thread's ptid, we need it later but the thread |
| 829 | may have exited. */ |
| 830 | call_thread_ptid = tp->ptid; |
| 831 | |
| 832 | /* Run the inferior until it stops. */ |
| 833 | |
| 834 | e = run_inferior_call (tp, real_pc); |
| 835 | } |
| 836 | |
| 837 | /* Rethrow an error if we got one trying to run the inferior. */ |
| 838 | |
| 839 | if (e.reason < 0) |
| 840 | { |
| 841 | const char *name = get_function_name (funaddr, |
| 842 | name_buf, sizeof (name_buf)); |
| 843 | |
| 844 | discard_infcall_control_state (inf_status); |
| 845 | |
| 846 | /* We could discard the dummy frame here if the program exited, |
| 847 | but it will get garbage collected the next time the program is |
| 848 | run anyway. */ |
| 849 | |
| 850 | switch (e.reason) |
| 851 | { |
| 852 | case RETURN_ERROR: |
| 853 | throw_error (e.error, _("%s\n\ |
| 854 | An error occurred while in a function called from GDB.\n\ |
| 855 | Evaluation of the expression containing the function\n\ |
| 856 | (%s) will be abandoned.\n\ |
| 857 | When the function is done executing, GDB will silently stop."), |
| 858 | e.message, name); |
| 859 | case RETURN_QUIT: |
| 860 | default: |
| 861 | throw_exception (e); |
| 862 | } |
| 863 | } |
| 864 | |
| 865 | /* If the program has exited, or we stopped at a different thread, |
| 866 | exit and inform the user. */ |
| 867 | |
| 868 | if (! target_has_execution) |
| 869 | { |
| 870 | const char *name = get_function_name (funaddr, |
| 871 | name_buf, sizeof (name_buf)); |
| 872 | |
| 873 | /* If we try to restore the inferior status, |
| 874 | we'll crash as the inferior is no longer running. */ |
| 875 | discard_infcall_control_state (inf_status); |
| 876 | |
| 877 | /* We could discard the dummy frame here given that the program exited, |
| 878 | but it will get garbage collected the next time the program is |
| 879 | run anyway. */ |
| 880 | |
| 881 | error (_("The program being debugged exited while in a function " |
| 882 | "called from GDB.\n" |
| 883 | "Evaluation of the expression containing the function\n" |
| 884 | "(%s) will be abandoned."), |
| 885 | name); |
| 886 | } |
| 887 | |
| 888 | if (! ptid_equal (call_thread_ptid, inferior_ptid)) |
| 889 | { |
| 890 | const char *name = get_function_name (funaddr, |
| 891 | name_buf, sizeof (name_buf)); |
| 892 | |
| 893 | /* We've switched threads. This can happen if another thread gets a |
| 894 | signal or breakpoint while our thread was running. |
| 895 | There's no point in restoring the inferior status, |
| 896 | we're in a different thread. */ |
| 897 | discard_infcall_control_state (inf_status); |
| 898 | /* Keep the dummy frame record, if the user switches back to the |
| 899 | thread with the hand-call, we'll need it. */ |
| 900 | if (stopped_by_random_signal) |
| 901 | error (_("\ |
| 902 | The program received a signal in another thread while\n\ |
| 903 | making a function call from GDB.\n\ |
| 904 | Evaluation of the expression containing the function\n\ |
| 905 | (%s) will be abandoned.\n\ |
| 906 | When the function is done executing, GDB will silently stop."), |
| 907 | name); |
| 908 | else |
| 909 | error (_("\ |
| 910 | The program stopped in another thread while making a function call from GDB.\n\ |
| 911 | Evaluation of the expression containing the function\n\ |
| 912 | (%s) will be abandoned.\n\ |
| 913 | When the function is done executing, GDB will silently stop."), |
| 914 | name); |
| 915 | } |
| 916 | |
| 917 | if (stopped_by_random_signal || stop_stack_dummy != STOP_STACK_DUMMY) |
| 918 | { |
| 919 | const char *name = get_function_name (funaddr, |
| 920 | name_buf, sizeof (name_buf)); |
| 921 | |
| 922 | if (stopped_by_random_signal) |
| 923 | { |
| 924 | /* We stopped inside the FUNCTION because of a random |
| 925 | signal. Further execution of the FUNCTION is not |
| 926 | allowed. */ |
| 927 | |
| 928 | if (unwind_on_signal_p) |
| 929 | { |
| 930 | /* The user wants the context restored. */ |
| 931 | |
| 932 | /* We must get back to the frame we were before the |
| 933 | dummy call. */ |
| 934 | dummy_frame_pop (dummy_id); |
| 935 | |
| 936 | /* We also need to restore inferior status to that before the |
| 937 | dummy call. */ |
| 938 | restore_infcall_control_state (inf_status); |
| 939 | |
| 940 | /* FIXME: Insert a bunch of wrap_here; name can be very |
| 941 | long if it's a C++ name with arguments and stuff. */ |
| 942 | error (_("\ |
| 943 | The program being debugged was signaled while in a function called from GDB.\n\ |
| 944 | GDB has restored the context to what it was before the call.\n\ |
| 945 | To change this behavior use \"set unwindonsignal off\".\n\ |
| 946 | Evaluation of the expression containing the function\n\ |
| 947 | (%s) will be abandoned."), |
| 948 | name); |
| 949 | } |
| 950 | else |
| 951 | { |
| 952 | /* The user wants to stay in the frame where we stopped |
| 953 | (default). |
| 954 | Discard inferior status, we're not at the same point |
| 955 | we started at. */ |
| 956 | discard_infcall_control_state (inf_status); |
| 957 | |
| 958 | /* FIXME: Insert a bunch of wrap_here; name can be very |
| 959 | long if it's a C++ name with arguments and stuff. */ |
| 960 | error (_("\ |
| 961 | The program being debugged was signaled while in a function called from GDB.\n\ |
| 962 | GDB remains in the frame where the signal was received.\n\ |
| 963 | To change this behavior use \"set unwindonsignal on\".\n\ |
| 964 | Evaluation of the expression containing the function\n\ |
| 965 | (%s) will be abandoned.\n\ |
| 966 | When the function is done executing, GDB will silently stop."), |
| 967 | name); |
| 968 | } |
| 969 | } |
| 970 | |
| 971 | if (stop_stack_dummy == STOP_STD_TERMINATE) |
| 972 | { |
| 973 | /* We must get back to the frame we were before the dummy |
| 974 | call. */ |
| 975 | dummy_frame_pop (dummy_id); |
| 976 | |
| 977 | /* We also need to restore inferior status to that before |
| 978 | the dummy call. */ |
| 979 | restore_infcall_control_state (inf_status); |
| 980 | |
| 981 | error (_("\ |
| 982 | The program being debugged entered a std::terminate call, most likely\n\ |
| 983 | caused by an unhandled C++ exception. GDB blocked this call in order\n\ |
| 984 | to prevent the program from being terminated, and has restored the\n\ |
| 985 | context to its original state before the call.\n\ |
| 986 | To change this behaviour use \"set unwind-on-terminating-exception off\".\n\ |
| 987 | Evaluation of the expression containing the function (%s)\n\ |
| 988 | will be abandoned."), |
| 989 | name); |
| 990 | } |
| 991 | else if (stop_stack_dummy == STOP_NONE) |
| 992 | { |
| 993 | |
| 994 | /* We hit a breakpoint inside the FUNCTION. |
| 995 | Keep the dummy frame, the user may want to examine its state. |
| 996 | Discard inferior status, we're not at the same point |
| 997 | we started at. */ |
| 998 | discard_infcall_control_state (inf_status); |
| 999 | |
| 1000 | /* The following error message used to say "The expression |
| 1001 | which contained the function call has been discarded." |
| 1002 | It is a hard concept to explain in a few words. Ideally, |
| 1003 | GDB would be able to resume evaluation of the expression |
| 1004 | when the function finally is done executing. Perhaps |
| 1005 | someday this will be implemented (it would not be easy). */ |
| 1006 | /* FIXME: Insert a bunch of wrap_here; name can be very long if it's |
| 1007 | a C++ name with arguments and stuff. */ |
| 1008 | error (_("\ |
| 1009 | The program being debugged stopped while in a function called from GDB.\n\ |
| 1010 | Evaluation of the expression containing the function\n\ |
| 1011 | (%s) will be abandoned.\n\ |
| 1012 | When the function is done executing, GDB will silently stop."), |
| 1013 | name); |
| 1014 | } |
| 1015 | |
| 1016 | /* The above code errors out, so ... */ |
| 1017 | internal_error (__FILE__, __LINE__, _("... should not be here")); |
| 1018 | } |
| 1019 | |
| 1020 | do_cleanups (terminate_bp_cleanup); |
| 1021 | |
| 1022 | /* If we get here the called FUNCTION ran to completion, |
| 1023 | and the dummy frame has already been popped. */ |
| 1024 | |
| 1025 | { |
| 1026 | struct address_space *aspace = get_regcache_aspace (stop_registers); |
| 1027 | struct regcache *retbuf = regcache_xmalloc (gdbarch, aspace); |
| 1028 | struct cleanup *retbuf_cleanup = make_cleanup_regcache_xfree (retbuf); |
| 1029 | struct value *retval = NULL; |
| 1030 | |
| 1031 | regcache_cpy_no_passthrough (retbuf, stop_registers); |
| 1032 | |
| 1033 | /* Inferior call is successful. Restore the inferior status. |
| 1034 | At this stage, leave the RETBUF alone. */ |
| 1035 | restore_infcall_control_state (inf_status); |
| 1036 | |
| 1037 | /* Figure out the value returned by the function. */ |
| 1038 | retval = allocate_value (values_type); |
| 1039 | |
| 1040 | if (lang_struct_return) |
| 1041 | read_value_memory (retval, 0, 1, struct_addr, |
| 1042 | value_contents_raw (retval), |
| 1043 | TYPE_LENGTH (values_type)); |
| 1044 | else if (TYPE_CODE (target_values_type) != TYPE_CODE_VOID) |
| 1045 | { |
| 1046 | /* If the function returns void, don't bother fetching the |
| 1047 | return value. */ |
| 1048 | switch (gdbarch_return_value (gdbarch, value_type (function), |
| 1049 | target_values_type, NULL, NULL, NULL)) |
| 1050 | { |
| 1051 | case RETURN_VALUE_REGISTER_CONVENTION: |
| 1052 | case RETURN_VALUE_ABI_RETURNS_ADDRESS: |
| 1053 | case RETURN_VALUE_ABI_PRESERVES_ADDRESS: |
| 1054 | gdbarch_return_value (gdbarch, value_type (function), values_type, |
| 1055 | retbuf, value_contents_raw (retval), NULL); |
| 1056 | break; |
| 1057 | case RETURN_VALUE_STRUCT_CONVENTION: |
| 1058 | read_value_memory (retval, 0, 1, struct_addr, |
| 1059 | value_contents_raw (retval), |
| 1060 | TYPE_LENGTH (values_type)); |
| 1061 | break; |
| 1062 | } |
| 1063 | } |
| 1064 | |
| 1065 | do_cleanups (retbuf_cleanup); |
| 1066 | |
| 1067 | gdb_assert (retval); |
| 1068 | return retval; |
| 1069 | } |
| 1070 | } |
| 1071 | \f |
| 1072 | |
| 1073 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 1074 | void _initialize_infcall (void); |
| 1075 | |
| 1076 | void |
| 1077 | _initialize_infcall (void) |
| 1078 | { |
| 1079 | add_setshow_boolean_cmd ("coerce-float-to-double", class_obscure, |
| 1080 | &coerce_float_to_double_p, _("\ |
| 1081 | Set coercion of floats to doubles when calling functions."), _("\ |
| 1082 | Show coercion of floats to doubles when calling functions"), _("\ |
| 1083 | Variables of type float should generally be converted to doubles before\n\ |
| 1084 | calling an unprototyped function, and left alone when calling a prototyped\n\ |
| 1085 | function. However, some older debug info formats do not provide enough\n\ |
| 1086 | information to determine that a function is prototyped. If this flag is\n\ |
| 1087 | set, GDB will perform the conversion for a function it considers\n\ |
| 1088 | unprototyped.\n\ |
| 1089 | The default is to perform the conversion.\n"), |
| 1090 | NULL, |
| 1091 | show_coerce_float_to_double_p, |
| 1092 | &setlist, &showlist); |
| 1093 | |
| 1094 | add_setshow_boolean_cmd ("unwindonsignal", no_class, |
| 1095 | &unwind_on_signal_p, _("\ |
| 1096 | Set unwinding of stack if a signal is received while in a call dummy."), _("\ |
| 1097 | Show unwinding of stack if a signal is received while in a call dummy."), _("\ |
| 1098 | The unwindonsignal lets the user determine what gdb should do if a signal\n\ |
| 1099 | is received while in a function called from gdb (call dummy). If set, gdb\n\ |
| 1100 | unwinds the stack and restore the context to what as it was before the call.\n\ |
| 1101 | The default is to stop in the frame where the signal was received."), |
| 1102 | NULL, |
| 1103 | show_unwind_on_signal_p, |
| 1104 | &setlist, &showlist); |
| 1105 | |
| 1106 | add_setshow_boolean_cmd ("unwind-on-terminating-exception", no_class, |
| 1107 | &unwind_on_terminating_exception_p, _("\ |
| 1108 | Set unwinding of stack if std::terminate is called while in call dummy."), _("\ |
| 1109 | Show unwinding of stack if std::terminate() is called while in a call dummy."), |
| 1110 | _("\ |
| 1111 | The unwind on terminating exception flag lets the user determine\n\ |
| 1112 | what gdb should do if a std::terminate() call is made from the\n\ |
| 1113 | default exception handler. If set, gdb unwinds the stack and restores\n\ |
| 1114 | the context to what it was before the call. If unset, gdb allows the\n\ |
| 1115 | std::terminate call to proceed.\n\ |
| 1116 | The default is to unwind the frame."), |
| 1117 | NULL, |
| 1118 | show_unwind_on_terminating_exception_p, |
| 1119 | &setlist, &showlist); |
| 1120 | |
| 1121 | } |