| 1 | /* Evaluator for GNU Emacs Lisp interpreter. |
| 2 | Copyright (C) 1985, 1986, 1987, 1993 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GNU Emacs. |
| 5 | |
| 6 | GNU Emacs is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 1, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | GNU Emacs is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GNU Emacs; see the file COPYING. If not, write to |
| 18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | |
| 21 | #include <config.h> |
| 22 | #include "lisp.h" |
| 23 | #include "blockinput.h" |
| 24 | |
| 25 | #ifndef standalone |
| 26 | #include "commands.h" |
| 27 | #include "keyboard.h" |
| 28 | #else |
| 29 | #define INTERACTIVE 1 |
| 30 | #endif |
| 31 | |
| 32 | #include <setjmp.h> |
| 33 | |
| 34 | /* This definition is duplicated in alloc.c and keyboard.c */ |
| 35 | /* Putting it in lisp.h makes cc bomb out! */ |
| 36 | |
| 37 | struct backtrace |
| 38 | { |
| 39 | struct backtrace *next; |
| 40 | Lisp_Object *function; |
| 41 | Lisp_Object *args; /* Points to vector of args. */ |
| 42 | int nargs; /* Length of vector. |
| 43 | If nargs is UNEVALLED, args points to slot holding |
| 44 | list of unevalled args */ |
| 45 | char evalargs; |
| 46 | /* Nonzero means call value of debugger when done with this operation. */ |
| 47 | char debug_on_exit; |
| 48 | }; |
| 49 | |
| 50 | struct backtrace *backtrace_list; |
| 51 | |
| 52 | /* This structure helps implement the `catch' and `throw' control |
| 53 | structure. A struct catchtag contains all the information needed |
| 54 | to restore the state of the interpreter after a non-local jump. |
| 55 | |
| 56 | Handlers for error conditions (represented by `struct handler' |
| 57 | structures) just point to a catch tag to do the cleanup required |
| 58 | for their jumps. |
| 59 | |
| 60 | catchtag structures are chained together in the C calling stack; |
| 61 | the `next' member points to the next outer catchtag. |
| 62 | |
| 63 | A call like (throw TAG VAL) searches for a catchtag whose `tag' |
| 64 | member is TAG, and then unbinds to it. The `val' member is used to |
| 65 | hold VAL while the stack is unwound; `val' is returned as the value |
| 66 | of the catch form. |
| 67 | |
| 68 | All the other members are concerned with restoring the interpreter |
| 69 | state. */ |
| 70 | struct catchtag |
| 71 | { |
| 72 | Lisp_Object tag; |
| 73 | Lisp_Object val; |
| 74 | struct catchtag *next; |
| 75 | struct gcpro *gcpro; |
| 76 | jmp_buf jmp; |
| 77 | struct backtrace *backlist; |
| 78 | struct handler *handlerlist; |
| 79 | int lisp_eval_depth; |
| 80 | int pdlcount; |
| 81 | int poll_suppress_count; |
| 82 | }; |
| 83 | |
| 84 | struct catchtag *catchlist; |
| 85 | |
| 86 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun; |
| 87 | Lisp_Object Qinhibit_quit, Vinhibit_quit, Vquit_flag; |
| 88 | Lisp_Object Qmocklisp_arguments, Vmocklisp_arguments, Qmocklisp; |
| 89 | Lisp_Object Qand_rest, Qand_optional; |
| 90 | Lisp_Object Qdebug_on_error; |
| 91 | |
| 92 | Lisp_Object Vrun_hooks; |
| 93 | |
| 94 | /* Non-nil means record all fset's and provide's, to be undone |
| 95 | if the file being autoloaded is not fully loaded. |
| 96 | They are recorded by being consed onto the front of Vautoload_queue: |
| 97 | (FUN . ODEF) for a defun, (OFEATURES . nil) for a provide. */ |
| 98 | |
| 99 | Lisp_Object Vautoload_queue; |
| 100 | |
| 101 | /* Current number of specbindings allocated in specpdl. */ |
| 102 | int specpdl_size; |
| 103 | |
| 104 | /* Pointer to beginning of specpdl. */ |
| 105 | struct specbinding *specpdl; |
| 106 | |
| 107 | /* Pointer to first unused element in specpdl. */ |
| 108 | struct specbinding *specpdl_ptr; |
| 109 | |
| 110 | /* Maximum size allowed for specpdl allocation */ |
| 111 | int max_specpdl_size; |
| 112 | |
| 113 | /* Depth in Lisp evaluations and function calls. */ |
| 114 | int lisp_eval_depth; |
| 115 | |
| 116 | /* Maximum allowed depth in Lisp evaluations and function calls. */ |
| 117 | int max_lisp_eval_depth; |
| 118 | |
| 119 | /* Nonzero means enter debugger before next function call */ |
| 120 | int debug_on_next_call; |
| 121 | |
| 122 | /* List of conditions (non-nil atom means all) which cause a backtrace |
| 123 | if an error is handled by the command loop's error handler. */ |
| 124 | Lisp_Object Vstack_trace_on_error; |
| 125 | |
| 126 | /* List of conditions (non-nil atom means all) which enter the debugger |
| 127 | if an error is handled by the command loop's error handler. */ |
| 128 | Lisp_Object Vdebug_on_error; |
| 129 | |
| 130 | /* Nonzero means enter debugger if a quit signal |
| 131 | is handled by the command loop's error handler. */ |
| 132 | int debug_on_quit; |
| 133 | |
| 134 | /* The value of num_nonmacro_input_chars as of the last time we |
| 135 | started to enter the debugger. If we decide to enter the debugger |
| 136 | again when this is still equal to num_nonmacro_input_chars, then we |
| 137 | know that the debugger itself has an error, and we should just |
| 138 | signal the error instead of entering an infinite loop of debugger |
| 139 | invocations. */ |
| 140 | int when_entered_debugger; |
| 141 | |
| 142 | Lisp_Object Vdebugger; |
| 143 | |
| 144 | void specbind (), record_unwind_protect (); |
| 145 | |
| 146 | Lisp_Object funcall_lambda (); |
| 147 | extern Lisp_Object ml_apply (); /* Apply a mocklisp function to unevaluated argument list */ |
| 148 | |
| 149 | init_eval_once () |
| 150 | { |
| 151 | specpdl_size = 50; |
| 152 | specpdl = (struct specbinding *) malloc (specpdl_size * sizeof (struct specbinding)); |
| 153 | max_specpdl_size = 600; |
| 154 | max_lisp_eval_depth = 200; |
| 155 | } |
| 156 | |
| 157 | init_eval () |
| 158 | { |
| 159 | specpdl_ptr = specpdl; |
| 160 | catchlist = 0; |
| 161 | handlerlist = 0; |
| 162 | backtrace_list = 0; |
| 163 | Vquit_flag = Qnil; |
| 164 | debug_on_next_call = 0; |
| 165 | lisp_eval_depth = 0; |
| 166 | when_entered_debugger = 0; |
| 167 | } |
| 168 | |
| 169 | Lisp_Object |
| 170 | call_debugger (arg) |
| 171 | Lisp_Object arg; |
| 172 | { |
| 173 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) |
| 174 | max_lisp_eval_depth = lisp_eval_depth + 20; |
| 175 | if (specpdl_size + 40 > max_specpdl_size) |
| 176 | max_specpdl_size = specpdl_size + 40; |
| 177 | debug_on_next_call = 0; |
| 178 | when_entered_debugger = num_nonmacro_input_chars; |
| 179 | return apply1 (Vdebugger, arg); |
| 180 | } |
| 181 | |
| 182 | do_debug_on_call (code) |
| 183 | Lisp_Object code; |
| 184 | { |
| 185 | debug_on_next_call = 0; |
| 186 | backtrace_list->debug_on_exit = 1; |
| 187 | call_debugger (Fcons (code, Qnil)); |
| 188 | } |
| 189 | \f |
| 190 | /* NOTE!!! Every function that can call EVAL must protect its args |
| 191 | and temporaries from garbage collection while it needs them. |
| 192 | The definition of `For' shows what you have to do. */ |
| 193 | |
| 194 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, |
| 195 | "Eval args until one of them yields non-nil, then return that value.\n\ |
| 196 | The remaining args are not evalled at all.\n\ |
| 197 | If all args return nil, return nil.") |
| 198 | (args) |
| 199 | Lisp_Object args; |
| 200 | { |
| 201 | register Lisp_Object val; |
| 202 | Lisp_Object args_left; |
| 203 | struct gcpro gcpro1; |
| 204 | |
| 205 | if (NILP(args)) |
| 206 | return Qnil; |
| 207 | |
| 208 | args_left = args; |
| 209 | GCPRO1 (args_left); |
| 210 | |
| 211 | do |
| 212 | { |
| 213 | val = Feval (Fcar (args_left)); |
| 214 | if (!NILP (val)) |
| 215 | break; |
| 216 | args_left = Fcdr (args_left); |
| 217 | } |
| 218 | while (!NILP(args_left)); |
| 219 | |
| 220 | UNGCPRO; |
| 221 | return val; |
| 222 | } |
| 223 | |
| 224 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, |
| 225 | "Eval args until one of them yields nil, then return nil.\n\ |
| 226 | The remaining args are not evalled at all.\n\ |
| 227 | If no arg yields nil, return the last arg's value.") |
| 228 | (args) |
| 229 | Lisp_Object args; |
| 230 | { |
| 231 | register Lisp_Object val; |
| 232 | Lisp_Object args_left; |
| 233 | struct gcpro gcpro1; |
| 234 | |
| 235 | if (NILP(args)) |
| 236 | return Qt; |
| 237 | |
| 238 | args_left = args; |
| 239 | GCPRO1 (args_left); |
| 240 | |
| 241 | do |
| 242 | { |
| 243 | val = Feval (Fcar (args_left)); |
| 244 | if (NILP (val)) |
| 245 | break; |
| 246 | args_left = Fcdr (args_left); |
| 247 | } |
| 248 | while (!NILP(args_left)); |
| 249 | |
| 250 | UNGCPRO; |
| 251 | return val; |
| 252 | } |
| 253 | |
| 254 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, |
| 255 | "(if COND THEN ELSE...): if COND yields non-nil, do THEN, else do ELSE...\n\ |
| 256 | Returns the value of THEN or the value of the last of the ELSE's.\n\ |
| 257 | THEN must be one expression, but ELSE... can be zero or more expressions.\n\ |
| 258 | If COND yields nil, and there are no ELSE's, the value is nil.") |
| 259 | (args) |
| 260 | Lisp_Object args; |
| 261 | { |
| 262 | register Lisp_Object cond; |
| 263 | struct gcpro gcpro1; |
| 264 | |
| 265 | GCPRO1 (args); |
| 266 | cond = Feval (Fcar (args)); |
| 267 | UNGCPRO; |
| 268 | |
| 269 | if (!NILP (cond)) |
| 270 | return Feval (Fcar (Fcdr (args))); |
| 271 | return Fprogn (Fcdr (Fcdr (args))); |
| 272 | } |
| 273 | |
| 274 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, |
| 275 | "(cond CLAUSES...): try each clause until one succeeds.\n\ |
| 276 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated\n\ |
| 277 | and, if the value is non-nil, this clause succeeds:\n\ |
| 278 | then the expressions in BODY are evaluated and the last one's\n\ |
| 279 | value is the value of the cond-form.\n\ |
| 280 | If no clause succeeds, cond returns nil.\n\ |
| 281 | If a clause has one element, as in (CONDITION),\n\ |
| 282 | CONDITION's value if non-nil is returned from the cond-form.") |
| 283 | (args) |
| 284 | Lisp_Object args; |
| 285 | { |
| 286 | register Lisp_Object clause, val; |
| 287 | struct gcpro gcpro1; |
| 288 | |
| 289 | val = Qnil; |
| 290 | GCPRO1 (args); |
| 291 | while (!NILP (args)) |
| 292 | { |
| 293 | clause = Fcar (args); |
| 294 | val = Feval (Fcar (clause)); |
| 295 | if (!NILP (val)) |
| 296 | { |
| 297 | if (!EQ (XCONS (clause)->cdr, Qnil)) |
| 298 | val = Fprogn (XCONS (clause)->cdr); |
| 299 | break; |
| 300 | } |
| 301 | args = XCONS (args)->cdr; |
| 302 | } |
| 303 | UNGCPRO; |
| 304 | |
| 305 | return val; |
| 306 | } |
| 307 | |
| 308 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, |
| 309 | "(progn BODY...): eval BODY forms sequentially and return value of last one.") |
| 310 | (args) |
| 311 | Lisp_Object args; |
| 312 | { |
| 313 | register Lisp_Object val, tem; |
| 314 | Lisp_Object args_left; |
| 315 | struct gcpro gcpro1; |
| 316 | |
| 317 | /* In Mocklisp code, symbols at the front of the progn arglist |
| 318 | are to be bound to zero. */ |
| 319 | if (!EQ (Vmocklisp_arguments, Qt)) |
| 320 | { |
| 321 | val = make_number (0); |
| 322 | while (!NILP (args) && (tem = Fcar (args), XTYPE (tem) == Lisp_Symbol)) |
| 323 | { |
| 324 | QUIT; |
| 325 | specbind (tem, val), args = Fcdr (args); |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | if (NILP(args)) |
| 330 | return Qnil; |
| 331 | |
| 332 | args_left = args; |
| 333 | GCPRO1 (args_left); |
| 334 | |
| 335 | do |
| 336 | { |
| 337 | val = Feval (Fcar (args_left)); |
| 338 | args_left = Fcdr (args_left); |
| 339 | } |
| 340 | while (!NILP(args_left)); |
| 341 | |
| 342 | UNGCPRO; |
| 343 | return val; |
| 344 | } |
| 345 | |
| 346 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, |
| 347 | "(prog1 FIRST BODY...): eval FIRST and BODY sequentially; value from FIRST.\n\ |
| 348 | The value of FIRST is saved during the evaluation of the remaining args,\n\ |
| 349 | whose values are discarded.") |
| 350 | (args) |
| 351 | Lisp_Object args; |
| 352 | { |
| 353 | Lisp_Object val; |
| 354 | register Lisp_Object args_left; |
| 355 | struct gcpro gcpro1, gcpro2; |
| 356 | register int argnum = 0; |
| 357 | |
| 358 | if (NILP(args)) |
| 359 | return Qnil; |
| 360 | |
| 361 | args_left = args; |
| 362 | val = Qnil; |
| 363 | GCPRO2 (args, val); |
| 364 | |
| 365 | do |
| 366 | { |
| 367 | if (!(argnum++)) |
| 368 | val = Feval (Fcar (args_left)); |
| 369 | else |
| 370 | Feval (Fcar (args_left)); |
| 371 | args_left = Fcdr (args_left); |
| 372 | } |
| 373 | while (!NILP(args_left)); |
| 374 | |
| 375 | UNGCPRO; |
| 376 | return val; |
| 377 | } |
| 378 | |
| 379 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, |
| 380 | "(prog1 X Y BODY...): eval X, Y and BODY sequentially; value from Y.\n\ |
| 381 | The value of Y is saved during the evaluation of the remaining args,\n\ |
| 382 | whose values are discarded.") |
| 383 | (args) |
| 384 | Lisp_Object args; |
| 385 | { |
| 386 | Lisp_Object val; |
| 387 | register Lisp_Object args_left; |
| 388 | struct gcpro gcpro1, gcpro2; |
| 389 | register int argnum = -1; |
| 390 | |
| 391 | val = Qnil; |
| 392 | |
| 393 | if (NILP (args)) |
| 394 | return Qnil; |
| 395 | |
| 396 | args_left = args; |
| 397 | val = Qnil; |
| 398 | GCPRO2 (args, val); |
| 399 | |
| 400 | do |
| 401 | { |
| 402 | if (!(argnum++)) |
| 403 | val = Feval (Fcar (args_left)); |
| 404 | else |
| 405 | Feval (Fcar (args_left)); |
| 406 | args_left = Fcdr (args_left); |
| 407 | } |
| 408 | while (!NILP (args_left)); |
| 409 | |
| 410 | UNGCPRO; |
| 411 | return val; |
| 412 | } |
| 413 | |
| 414 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, |
| 415 | "(setq SYM VAL SYM VAL ...): set each SYM to the value of its VAL.\n\ |
| 416 | The SYMs are not evaluated. Thus (setq x y) sets x to the value of y.\n\ |
| 417 | Each SYM is set before the next VAL is computed.\n\ |
| 418 | The return value of the `setq' form is the value of the last VAL.") |
| 419 | (args) |
| 420 | Lisp_Object args; |
| 421 | { |
| 422 | register Lisp_Object args_left; |
| 423 | register Lisp_Object val, sym; |
| 424 | struct gcpro gcpro1; |
| 425 | |
| 426 | if (NILP(args)) |
| 427 | return Qnil; |
| 428 | |
| 429 | args_left = args; |
| 430 | GCPRO1 (args); |
| 431 | |
| 432 | do |
| 433 | { |
| 434 | val = Feval (Fcar (Fcdr (args_left))); |
| 435 | sym = Fcar (args_left); |
| 436 | Fset (sym, val); |
| 437 | args_left = Fcdr (Fcdr (args_left)); |
| 438 | } |
| 439 | while (!NILP(args_left)); |
| 440 | |
| 441 | UNGCPRO; |
| 442 | return val; |
| 443 | } |
| 444 | |
| 445 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, |
| 446 | "Return the argument, without evaluating it. `(quote x)' yields `x'.") |
| 447 | (args) |
| 448 | Lisp_Object args; |
| 449 | { |
| 450 | return Fcar (args); |
| 451 | } |
| 452 | |
| 453 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, |
| 454 | "Like `quote', but preferred for objects which are functions.\n\ |
| 455 | In byte compilation, `function' causes its argument to be compiled.\n\ |
| 456 | `quote' cannot do that.") |
| 457 | (args) |
| 458 | Lisp_Object args; |
| 459 | { |
| 460 | return Fcar (args); |
| 461 | } |
| 462 | |
| 463 | DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0, |
| 464 | "Return t if function in which this appears was called interactively.\n\ |
| 465 | This means that the function was called with call-interactively (which\n\ |
| 466 | includes being called as the binding of a key)\n\ |
| 467 | and input is currently coming from the keyboard (not in keyboard macro).") |
| 468 | () |
| 469 | { |
| 470 | register struct backtrace *btp; |
| 471 | register Lisp_Object fun; |
| 472 | |
| 473 | if (!INTERACTIVE) |
| 474 | return Qnil; |
| 475 | |
| 476 | btp = backtrace_list; |
| 477 | |
| 478 | /* If this isn't a byte-compiled function, there may be a frame at |
| 479 | the top for Finteractive_p itself. If so, skip it. */ |
| 480 | fun = Findirect_function (*btp->function); |
| 481 | if (XTYPE (fun) == Lisp_Subr |
| 482 | && (struct Lisp_Subr *) XPNTR (fun) == &Sinteractive_p) |
| 483 | btp = btp->next; |
| 484 | |
| 485 | /* If we're running an Emacs 18-style byte-compiled function, there |
| 486 | may be a frame for Fbytecode. Now, given the strictest |
| 487 | definition, this function isn't really being called |
| 488 | interactively, but because that's the way Emacs 18 always builds |
| 489 | byte-compiled functions, we'll accept it for now. */ |
| 490 | if (EQ (*btp->function, Qbytecode)) |
| 491 | btp = btp->next; |
| 492 | |
| 493 | /* If this isn't a byte-compiled function, then we may now be |
| 494 | looking at several frames for special forms. Skip past them. */ |
| 495 | while (btp && |
| 496 | btp->nargs == UNEVALLED) |
| 497 | btp = btp->next; |
| 498 | |
| 499 | /* btp now points at the frame of the innermost function that isn't |
| 500 | a special form, ignoring frames for Finteractive_p and/or |
| 501 | Fbytecode at the top. If this frame is for a built-in function |
| 502 | (such as load or eval-region) return nil. */ |
| 503 | fun = Findirect_function (*btp->function); |
| 504 | if (XTYPE (fun) == Lisp_Subr) |
| 505 | return Qnil; |
| 506 | /* btp points to the frame of a Lisp function that called interactive-p. |
| 507 | Return t if that function was called interactively. */ |
| 508 | if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively)) |
| 509 | return Qt; |
| 510 | return Qnil; |
| 511 | } |
| 512 | |
| 513 | DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0, |
| 514 | "(defun NAME ARGLIST [DOCSTRING] BODY...): define NAME as a function.\n\ |
| 515 | The definition is (lambda ARGLIST [DOCSTRING] BODY...).\n\ |
| 516 | See also the function `interactive'.") |
| 517 | (args) |
| 518 | Lisp_Object args; |
| 519 | { |
| 520 | register Lisp_Object fn_name; |
| 521 | register Lisp_Object defn; |
| 522 | |
| 523 | fn_name = Fcar (args); |
| 524 | defn = Fcons (Qlambda, Fcdr (args)); |
| 525 | if (!NILP (Vpurify_flag)) |
| 526 | defn = Fpurecopy (defn); |
| 527 | Ffset (fn_name, defn); |
| 528 | LOADHIST_ATTACH (fn_name); |
| 529 | return fn_name; |
| 530 | } |
| 531 | |
| 532 | DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0, |
| 533 | "(defmacro NAME ARGLIST [DOCSTRING] BODY...): define NAME as a macro.\n\ |
| 534 | The definition is (macro lambda ARGLIST [DOCSTRING] BODY...).\n\ |
| 535 | When the macro is called, as in (NAME ARGS...),\n\ |
| 536 | the function (lambda ARGLIST BODY...) is applied to\n\ |
| 537 | the list ARGS... as it appears in the expression,\n\ |
| 538 | and the result should be a form to be evaluated instead of the original.") |
| 539 | (args) |
| 540 | Lisp_Object args; |
| 541 | { |
| 542 | register Lisp_Object fn_name; |
| 543 | register Lisp_Object defn; |
| 544 | |
| 545 | fn_name = Fcar (args); |
| 546 | defn = Fcons (Qmacro, Fcons (Qlambda, Fcdr (args))); |
| 547 | if (!NILP (Vpurify_flag)) |
| 548 | defn = Fpurecopy (defn); |
| 549 | Ffset (fn_name, defn); |
| 550 | LOADHIST_ATTACH (fn_name); |
| 551 | return fn_name; |
| 552 | } |
| 553 | |
| 554 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, |
| 555 | "(defvar SYMBOL INITVALUE DOCSTRING): define SYMBOL as a variable.\n\ |
| 556 | You are not required to define a variable in order to use it,\n\ |
| 557 | but the definition can supply documentation and an initial value\n\ |
| 558 | in a way that tags can recognize.\n\n\ |
| 559 | INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void.\n\ |
| 560 | If SYMBOL is buffer-local, its default value is what is set;\n\ |
| 561 | buffer-local values are not affected.\n\ |
| 562 | INITVALUE and DOCSTRING are optional.\n\ |
| 563 | If DOCSTRING starts with *, this variable is identified as a user option.\n\ |
| 564 | This means that M-x set-variable and M-x edit-options recognize it.\n\ |
| 565 | If INITVALUE is missing, SYMBOL's value is not set.") |
| 566 | (args) |
| 567 | Lisp_Object args; |
| 568 | { |
| 569 | register Lisp_Object sym, tem; |
| 570 | |
| 571 | sym = Fcar (args); |
| 572 | tem = Fcdr (args); |
| 573 | if (!NILP (tem)) |
| 574 | { |
| 575 | tem = Fdefault_boundp (sym); |
| 576 | if (NILP (tem)) |
| 577 | Fset_default (sym, Feval (Fcar (Fcdr (args)))); |
| 578 | } |
| 579 | tem = Fcar (Fcdr (Fcdr (args))); |
| 580 | if (!NILP (tem)) |
| 581 | { |
| 582 | if (!NILP (Vpurify_flag)) |
| 583 | tem = Fpurecopy (tem); |
| 584 | Fput (sym, Qvariable_documentation, tem); |
| 585 | } |
| 586 | LOADHIST_ATTACH (sym); |
| 587 | return sym; |
| 588 | } |
| 589 | |
| 590 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, |
| 591 | "(defconst SYMBOL INITVALUE DOCSTRING): define SYMBOL as a constant variable.\n\ |
| 592 | The intent is that programs do not change this value, but users may.\n\ |
| 593 | Always sets the value of SYMBOL to the result of evalling INITVALUE.\n\ |
| 594 | If SYMBOL is buffer-local, its default value is what is set;\n\ |
| 595 | buffer-local values are not affected.\n\ |
| 596 | DOCSTRING is optional.\n\ |
| 597 | If DOCSTRING starts with *, this variable is identified as a user option.\n\ |
| 598 | This means that M-x set-variable and M-x edit-options recognize it.\n\n\ |
| 599 | Note: do not use `defconst' for user options in libraries that are not\n\ |
| 600 | normally loaded, since it is useful for users to be able to specify\n\ |
| 601 | their own values for such variables before loading the library.\n\ |
| 602 | Since `defconst' unconditionally assigns the variable,\n\ |
| 603 | it would override the user's choice.") |
| 604 | (args) |
| 605 | Lisp_Object args; |
| 606 | { |
| 607 | register Lisp_Object sym, tem; |
| 608 | |
| 609 | sym = Fcar (args); |
| 610 | Fset_default (sym, Feval (Fcar (Fcdr (args)))); |
| 611 | tem = Fcar (Fcdr (Fcdr (args))); |
| 612 | if (!NILP (tem)) |
| 613 | { |
| 614 | if (!NILP (Vpurify_flag)) |
| 615 | tem = Fpurecopy (tem); |
| 616 | Fput (sym, Qvariable_documentation, tem); |
| 617 | } |
| 618 | LOADHIST_ATTACH (sym); |
| 619 | return sym; |
| 620 | } |
| 621 | |
| 622 | DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0, |
| 623 | "Returns t if VARIABLE is intended to be set and modified by users.\n\ |
| 624 | \(The alternative is a variable used internally in a Lisp program.)\n\ |
| 625 | Determined by whether the first character of the documentation\n\ |
| 626 | for the variable is \"*\"") |
| 627 | (variable) |
| 628 | Lisp_Object variable; |
| 629 | { |
| 630 | Lisp_Object documentation; |
| 631 | |
| 632 | documentation = Fget (variable, Qvariable_documentation); |
| 633 | if (XTYPE (documentation) == Lisp_Int && XINT (documentation) < 0) |
| 634 | return Qt; |
| 635 | if ((XTYPE (documentation) == Lisp_String) && |
| 636 | ((unsigned char) XSTRING (documentation)->data[0] == '*')) |
| 637 | return Qt; |
| 638 | return Qnil; |
| 639 | } |
| 640 | \f |
| 641 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, |
| 642 | "(let* VARLIST BODY...): bind variables according to VARLIST then eval BODY.\n\ |
| 643 | The value of the last form in BODY is returned.\n\ |
| 644 | Each element of VARLIST is a symbol (which is bound to nil)\n\ |
| 645 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).\n\ |
| 646 | Each VALUEFORM can refer to the symbols already bound by this VARLIST.") |
| 647 | (args) |
| 648 | Lisp_Object args; |
| 649 | { |
| 650 | Lisp_Object varlist, val, elt; |
| 651 | int count = specpdl_ptr - specpdl; |
| 652 | struct gcpro gcpro1, gcpro2, gcpro3; |
| 653 | |
| 654 | GCPRO3 (args, elt, varlist); |
| 655 | |
| 656 | varlist = Fcar (args); |
| 657 | while (!NILP (varlist)) |
| 658 | { |
| 659 | QUIT; |
| 660 | elt = Fcar (varlist); |
| 661 | if (XTYPE (elt) == Lisp_Symbol) |
| 662 | specbind (elt, Qnil); |
| 663 | else if (! NILP (Fcdr (Fcdr (elt)))) |
| 664 | Fsignal (Qerror, |
| 665 | Fcons (build_string ("`let' bindings can have only one value-form"), |
| 666 | elt)); |
| 667 | else |
| 668 | { |
| 669 | val = Feval (Fcar (Fcdr (elt))); |
| 670 | specbind (Fcar (elt), val); |
| 671 | } |
| 672 | varlist = Fcdr (varlist); |
| 673 | } |
| 674 | UNGCPRO; |
| 675 | val = Fprogn (Fcdr (args)); |
| 676 | return unbind_to (count, val); |
| 677 | } |
| 678 | |
| 679 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, |
| 680 | "(let VARLIST BODY...): bind variables according to VARLIST then eval BODY.\n\ |
| 681 | The value of the last form in BODY is returned.\n\ |
| 682 | Each element of VARLIST is a symbol (which is bound to nil)\n\ |
| 683 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).\n\ |
| 684 | All the VALUEFORMs are evalled before any symbols are bound.") |
| 685 | (args) |
| 686 | Lisp_Object args; |
| 687 | { |
| 688 | Lisp_Object *temps, tem; |
| 689 | register Lisp_Object elt, varlist; |
| 690 | int count = specpdl_ptr - specpdl; |
| 691 | register int argnum; |
| 692 | struct gcpro gcpro1, gcpro2; |
| 693 | |
| 694 | varlist = Fcar (args); |
| 695 | |
| 696 | /* Make space to hold the values to give the bound variables */ |
| 697 | elt = Flength (varlist); |
| 698 | temps = (Lisp_Object *) alloca (XFASTINT (elt) * sizeof (Lisp_Object)); |
| 699 | |
| 700 | /* Compute the values and store them in `temps' */ |
| 701 | |
| 702 | GCPRO2 (args, *temps); |
| 703 | gcpro2.nvars = 0; |
| 704 | |
| 705 | for (argnum = 0; !NILP (varlist); varlist = Fcdr (varlist)) |
| 706 | { |
| 707 | QUIT; |
| 708 | elt = Fcar (varlist); |
| 709 | if (XTYPE (elt) == Lisp_Symbol) |
| 710 | temps [argnum++] = Qnil; |
| 711 | else if (! NILP (Fcdr (Fcdr (elt)))) |
| 712 | Fsignal (Qerror, |
| 713 | Fcons (build_string ("`let' bindings can have only one value-form"), |
| 714 | elt)); |
| 715 | else |
| 716 | temps [argnum++] = Feval (Fcar (Fcdr (elt))); |
| 717 | gcpro2.nvars = argnum; |
| 718 | } |
| 719 | UNGCPRO; |
| 720 | |
| 721 | varlist = Fcar (args); |
| 722 | for (argnum = 0; !NILP (varlist); varlist = Fcdr (varlist)) |
| 723 | { |
| 724 | elt = Fcar (varlist); |
| 725 | tem = temps[argnum++]; |
| 726 | if (XTYPE (elt) == Lisp_Symbol) |
| 727 | specbind (elt, tem); |
| 728 | else |
| 729 | specbind (Fcar (elt), tem); |
| 730 | } |
| 731 | |
| 732 | elt = Fprogn (Fcdr (args)); |
| 733 | return unbind_to (count, elt); |
| 734 | } |
| 735 | |
| 736 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, |
| 737 | "(while TEST BODY...): if TEST yields non-nil, eval BODY... and repeat.\n\ |
| 738 | The order of execution is thus TEST, BODY, TEST, BODY and so on\n\ |
| 739 | until TEST returns nil.") |
| 740 | (args) |
| 741 | Lisp_Object args; |
| 742 | { |
| 743 | Lisp_Object test, body, tem; |
| 744 | struct gcpro gcpro1, gcpro2; |
| 745 | |
| 746 | GCPRO2 (test, body); |
| 747 | |
| 748 | test = Fcar (args); |
| 749 | body = Fcdr (args); |
| 750 | while (tem = Feval (test), |
| 751 | (!EQ (Vmocklisp_arguments, Qt) ? XINT (tem) : !NILP (tem))) |
| 752 | { |
| 753 | QUIT; |
| 754 | Fprogn (body); |
| 755 | } |
| 756 | |
| 757 | UNGCPRO; |
| 758 | return Qnil; |
| 759 | } |
| 760 | |
| 761 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, |
| 762 | "Return result of expanding macros at top level of FORM.\n\ |
| 763 | If FORM is not a macro call, it is returned unchanged.\n\ |
| 764 | Otherwise, the macro is expanded and the expansion is considered\n\ |
| 765 | in place of FORM. When a non-macro-call results, it is returned.\n\n\ |
| 766 | The second optional arg ENVIRONMENT species an environment of macro\n\ |
| 767 | definitions to shadow the loaded ones for use in file byte-compilation.") |
| 768 | (form, env) |
| 769 | register Lisp_Object form; |
| 770 | Lisp_Object env; |
| 771 | { |
| 772 | /* With cleanups from Hallvard Furuseth. */ |
| 773 | register Lisp_Object expander, sym, def, tem; |
| 774 | |
| 775 | while (1) |
| 776 | { |
| 777 | /* Come back here each time we expand a macro call, |
| 778 | in case it expands into another macro call. */ |
| 779 | if (XTYPE (form) != Lisp_Cons) |
| 780 | break; |
| 781 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
| 782 | def = sym = XCONS (form)->car; |
| 783 | tem = Qnil; |
| 784 | /* Trace symbols aliases to other symbols |
| 785 | until we get a symbol that is not an alias. */ |
| 786 | while (XTYPE (def) == Lisp_Symbol) |
| 787 | { |
| 788 | QUIT; |
| 789 | sym = def; |
| 790 | tem = Fassq (sym, env); |
| 791 | if (NILP (tem)) |
| 792 | { |
| 793 | def = XSYMBOL (sym)->function; |
| 794 | if (!EQ (def, Qunbound)) |
| 795 | continue; |
| 796 | } |
| 797 | break; |
| 798 | } |
| 799 | /* Right now TEM is the result from SYM in ENV, |
| 800 | and if TEM is nil then DEF is SYM's function definition. */ |
| 801 | if (NILP (tem)) |
| 802 | { |
| 803 | /* SYM is not mentioned in ENV. |
| 804 | Look at its function definition. */ |
| 805 | if (EQ (def, Qunbound) |
| 806 | || XTYPE (def) != Lisp_Cons) |
| 807 | /* Not defined or definition not suitable */ |
| 808 | break; |
| 809 | if (EQ (XCONS (def)->car, Qautoload)) |
| 810 | { |
| 811 | /* Autoloading function: will it be a macro when loaded? */ |
| 812 | tem = Fnth (make_number (4), def); |
| 813 | if (EQ (tem, Qt) || EQ (tem, Qmacro)) |
| 814 | /* Yes, load it and try again. */ |
| 815 | { |
| 816 | do_autoload (def, sym); |
| 817 | continue; |
| 818 | } |
| 819 | else |
| 820 | break; |
| 821 | } |
| 822 | else if (!EQ (XCONS (def)->car, Qmacro)) |
| 823 | break; |
| 824 | else expander = XCONS (def)->cdr; |
| 825 | } |
| 826 | else |
| 827 | { |
| 828 | expander = XCONS (tem)->cdr; |
| 829 | if (NILP (expander)) |
| 830 | break; |
| 831 | } |
| 832 | form = apply1 (expander, XCONS (form)->cdr); |
| 833 | } |
| 834 | return form; |
| 835 | } |
| 836 | \f |
| 837 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, |
| 838 | "(catch TAG BODY...): eval BODY allowing nonlocal exits using `throw'.\n\ |
| 839 | TAG is evalled to get the tag to use. Then the BODY is executed.\n\ |
| 840 | Within BODY, (throw TAG) with same tag exits BODY and exits this `catch'.\n\ |
| 841 | If no throw happens, `catch' returns the value of the last BODY form.\n\ |
| 842 | If a throw happens, it specifies the value to return from `catch'.") |
| 843 | (args) |
| 844 | Lisp_Object args; |
| 845 | { |
| 846 | register Lisp_Object tag; |
| 847 | struct gcpro gcpro1; |
| 848 | |
| 849 | GCPRO1 (args); |
| 850 | tag = Feval (Fcar (args)); |
| 851 | UNGCPRO; |
| 852 | return internal_catch (tag, Fprogn, Fcdr (args)); |
| 853 | } |
| 854 | |
| 855 | /* Set up a catch, then call C function FUNC on argument ARG. |
| 856 | FUNC should return a Lisp_Object. |
| 857 | This is how catches are done from within C code. */ |
| 858 | |
| 859 | Lisp_Object |
| 860 | internal_catch (tag, func, arg) |
| 861 | Lisp_Object tag; |
| 862 | Lisp_Object (*func) (); |
| 863 | Lisp_Object arg; |
| 864 | { |
| 865 | /* This structure is made part of the chain `catchlist'. */ |
| 866 | struct catchtag c; |
| 867 | |
| 868 | /* Fill in the components of c, and put it on the list. */ |
| 869 | c.next = catchlist; |
| 870 | c.tag = tag; |
| 871 | c.val = Qnil; |
| 872 | c.backlist = backtrace_list; |
| 873 | c.handlerlist = handlerlist; |
| 874 | c.lisp_eval_depth = lisp_eval_depth; |
| 875 | c.pdlcount = specpdl_ptr - specpdl; |
| 876 | c.poll_suppress_count = poll_suppress_count; |
| 877 | c.gcpro = gcprolist; |
| 878 | catchlist = &c; |
| 879 | |
| 880 | /* Call FUNC. */ |
| 881 | if (! _setjmp (c.jmp)) |
| 882 | c.val = (*func) (arg); |
| 883 | |
| 884 | /* Throw works by a longjmp that comes right here. */ |
| 885 | catchlist = c.next; |
| 886 | return c.val; |
| 887 | } |
| 888 | |
| 889 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
| 890 | jump to that CATCH, returning VALUE as the value of that catch. |
| 891 | |
| 892 | This is the guts Fthrow and Fsignal; they differ only in the way |
| 893 | they choose the catch tag to throw to. A catch tag for a |
| 894 | condition-case form has a TAG of Qnil. |
| 895 | |
| 896 | Before each catch is discarded, unbind all special bindings and |
| 897 | execute all unwind-protect clauses made above that catch. Unwind |
| 898 | the handler stack as we go, so that the proper handlers are in |
| 899 | effect for each unwind-protect clause we run. At the end, restore |
| 900 | some static info saved in CATCH, and longjmp to the location |
| 901 | specified in the |
| 902 | |
| 903 | This is used for correct unwinding in Fthrow and Fsignal. */ |
| 904 | |
| 905 | static void |
| 906 | unwind_to_catch (catch, value) |
| 907 | struct catchtag *catch; |
| 908 | Lisp_Object value; |
| 909 | { |
| 910 | register int last_time; |
| 911 | |
| 912 | /* Save the value in the tag. */ |
| 913 | catch->val = value; |
| 914 | |
| 915 | /* Restore the polling-suppression count. */ |
| 916 | set_poll_suppress_count (catch->poll_suppress_count); |
| 917 | |
| 918 | do |
| 919 | { |
| 920 | last_time = catchlist == catch; |
| 921 | |
| 922 | /* Unwind the specpdl stack, and then restore the proper set of |
| 923 | handlers. */ |
| 924 | unbind_to (catchlist->pdlcount, Qnil); |
| 925 | handlerlist = catchlist->handlerlist; |
| 926 | catchlist = catchlist->next; |
| 927 | } |
| 928 | while (! last_time); |
| 929 | |
| 930 | gcprolist = catch->gcpro; |
| 931 | backtrace_list = catch->backlist; |
| 932 | lisp_eval_depth = catch->lisp_eval_depth; |
| 933 | |
| 934 | _longjmp (catch->jmp, 1); |
| 935 | } |
| 936 | |
| 937 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, |
| 938 | "(throw TAG VALUE): throw to the catch for TAG and return VALUE from it.\n\ |
| 939 | Both TAG and VALUE are evalled.") |
| 940 | (tag, val) |
| 941 | register Lisp_Object tag, val; |
| 942 | { |
| 943 | register struct catchtag *c; |
| 944 | |
| 945 | while (1) |
| 946 | { |
| 947 | if (!NILP (tag)) |
| 948 | for (c = catchlist; c; c = c->next) |
| 949 | { |
| 950 | if (EQ (c->tag, tag)) |
| 951 | unwind_to_catch (c, val); |
| 952 | } |
| 953 | tag = Fsignal (Qno_catch, Fcons (tag, Fcons (val, Qnil))); |
| 954 | } |
| 955 | } |
| 956 | |
| 957 | |
| 958 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, |
| 959 | "Do BODYFORM, protecting with UNWINDFORMS.\n\ |
| 960 | Usage looks like (unwind-protect BODYFORM UNWINDFORMS...).\n\ |
| 961 | If BODYFORM completes normally, its value is returned\n\ |
| 962 | after executing the UNWINDFORMS.\n\ |
| 963 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway.") |
| 964 | (args) |
| 965 | Lisp_Object args; |
| 966 | { |
| 967 | Lisp_Object val; |
| 968 | int count = specpdl_ptr - specpdl; |
| 969 | |
| 970 | record_unwind_protect (0, Fcdr (args)); |
| 971 | val = Feval (Fcar (args)); |
| 972 | return unbind_to (count, val); |
| 973 | } |
| 974 | \f |
| 975 | /* Chain of condition handlers currently in effect. |
| 976 | The elements of this chain are contained in the stack frames |
| 977 | of Fcondition_case and internal_condition_case. |
| 978 | When an error is signaled (by calling Fsignal, below), |
| 979 | this chain is searched for an element that applies. */ |
| 980 | |
| 981 | struct handler *handlerlist; |
| 982 | |
| 983 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, |
| 984 | "Regain control when an error is signaled.\n\ |
| 985 | Usage looks like (condition-case VAR BODYFORM HANDLERS...).\n\ |
| 986 | executes BODYFORM and returns its value if no error happens.\n\ |
| 987 | Each element of HANDLERS looks like (CONDITION-NAME BODY...)\n\ |
| 988 | where the BODY is made of Lisp expressions.\n\n\ |
| 989 | A handler is applicable to an error\n\ |
| 990 | if CONDITION-NAME is one of the error's condition names.\n\ |
| 991 | If an error happens, the first applicable handler is run.\n\ |
| 992 | \n\ |
| 993 | The car of a handler may be a list of condition names\n\ |
| 994 | instead of a single condition name.\n\ |
| 995 | \n\ |
| 996 | When a handler handles an error,\n\ |
| 997 | control returns to the condition-case and the handler BODY... is executed\n\ |
| 998 | with VAR bound to (SIGNALED-CONDITIONS . SIGNAL-DATA).\n\ |
| 999 | VAR may be nil; then you do not get access to the signal information.\n\ |
| 1000 | \n\ |
| 1001 | The value of the last BODY form is returned from the condition-case.\n\ |
| 1002 | See also the function `signal' for more info.") |
| 1003 | (args) |
| 1004 | Lisp_Object args; |
| 1005 | { |
| 1006 | Lisp_Object val; |
| 1007 | struct catchtag c; |
| 1008 | struct handler h; |
| 1009 | register Lisp_Object var, bodyform, handlers; |
| 1010 | |
| 1011 | var = Fcar (args); |
| 1012 | bodyform = Fcar (Fcdr (args)); |
| 1013 | handlers = Fcdr (Fcdr (args)); |
| 1014 | CHECK_SYMBOL (var, 0); |
| 1015 | |
| 1016 | for (val = handlers; ! NILP (val); val = Fcdr (val)) |
| 1017 | { |
| 1018 | Lisp_Object tem; |
| 1019 | tem = Fcar (val); |
| 1020 | if (! (NILP (tem) |
| 1021 | || (CONSP (tem) |
| 1022 | && (SYMBOLP (XCONS (tem)->car) |
| 1023 | || CONSP (XCONS (tem)->car))))) |
| 1024 | error ("Invalid condition handler", tem); |
| 1025 | } |
| 1026 | |
| 1027 | c.tag = Qnil; |
| 1028 | c.val = Qnil; |
| 1029 | c.backlist = backtrace_list; |
| 1030 | c.handlerlist = handlerlist; |
| 1031 | c.lisp_eval_depth = lisp_eval_depth; |
| 1032 | c.pdlcount = specpdl_ptr - specpdl; |
| 1033 | c.poll_suppress_count = poll_suppress_count; |
| 1034 | c.gcpro = gcprolist; |
| 1035 | if (_setjmp (c.jmp)) |
| 1036 | { |
| 1037 | if (!NILP (h.var)) |
| 1038 | specbind (h.var, c.val); |
| 1039 | val = Fprogn (Fcdr (h.chosen_clause)); |
| 1040 | |
| 1041 | /* Note that this just undoes the binding of h.var; whoever |
| 1042 | longjumped to us unwound the stack to c.pdlcount before |
| 1043 | throwing. */ |
| 1044 | unbind_to (c.pdlcount, Qnil); |
| 1045 | return val; |
| 1046 | } |
| 1047 | c.next = catchlist; |
| 1048 | catchlist = &c; |
| 1049 | |
| 1050 | h.var = var; |
| 1051 | h.handler = handlers; |
| 1052 | h.next = handlerlist; |
| 1053 | h.tag = &c; |
| 1054 | handlerlist = &h; |
| 1055 | |
| 1056 | val = Feval (bodyform); |
| 1057 | catchlist = c.next; |
| 1058 | handlerlist = h.next; |
| 1059 | return val; |
| 1060 | } |
| 1061 | |
| 1062 | Lisp_Object |
| 1063 | internal_condition_case (bfun, handlers, hfun) |
| 1064 | Lisp_Object (*bfun) (); |
| 1065 | Lisp_Object handlers; |
| 1066 | Lisp_Object (*hfun) (); |
| 1067 | { |
| 1068 | Lisp_Object val; |
| 1069 | struct catchtag c; |
| 1070 | struct handler h; |
| 1071 | |
| 1072 | c.tag = Qnil; |
| 1073 | c.val = Qnil; |
| 1074 | c.backlist = backtrace_list; |
| 1075 | c.handlerlist = handlerlist; |
| 1076 | c.lisp_eval_depth = lisp_eval_depth; |
| 1077 | c.pdlcount = specpdl_ptr - specpdl; |
| 1078 | c.poll_suppress_count = poll_suppress_count; |
| 1079 | c.gcpro = gcprolist; |
| 1080 | if (_setjmp (c.jmp)) |
| 1081 | { |
| 1082 | return (*hfun) (c.val); |
| 1083 | } |
| 1084 | c.next = catchlist; |
| 1085 | catchlist = &c; |
| 1086 | h.handler = handlers; |
| 1087 | h.var = Qnil; |
| 1088 | h.next = handlerlist; |
| 1089 | h.tag = &c; |
| 1090 | handlerlist = &h; |
| 1091 | |
| 1092 | val = (*bfun) (); |
| 1093 | catchlist = c.next; |
| 1094 | handlerlist = h.next; |
| 1095 | return val; |
| 1096 | } |
| 1097 | |
| 1098 | Lisp_Object |
| 1099 | internal_condition_case_1 (bfun, arg, handlers, hfun) |
| 1100 | Lisp_Object (*bfun) (); |
| 1101 | Lisp_Object arg; |
| 1102 | Lisp_Object handlers; |
| 1103 | Lisp_Object (*hfun) (); |
| 1104 | { |
| 1105 | Lisp_Object val; |
| 1106 | struct catchtag c; |
| 1107 | struct handler h; |
| 1108 | |
| 1109 | c.tag = Qnil; |
| 1110 | c.val = Qnil; |
| 1111 | c.backlist = backtrace_list; |
| 1112 | c.handlerlist = handlerlist; |
| 1113 | c.lisp_eval_depth = lisp_eval_depth; |
| 1114 | c.pdlcount = specpdl_ptr - specpdl; |
| 1115 | c.poll_suppress_count = poll_suppress_count; |
| 1116 | c.gcpro = gcprolist; |
| 1117 | if (_setjmp (c.jmp)) |
| 1118 | { |
| 1119 | return (*hfun) (c.val); |
| 1120 | } |
| 1121 | c.next = catchlist; |
| 1122 | catchlist = &c; |
| 1123 | h.handler = handlers; |
| 1124 | h.var = Qnil; |
| 1125 | h.next = handlerlist; |
| 1126 | h.tag = &c; |
| 1127 | handlerlist = &h; |
| 1128 | |
| 1129 | val = (*bfun) (arg); |
| 1130 | catchlist = c.next; |
| 1131 | handlerlist = h.next; |
| 1132 | return val; |
| 1133 | } |
| 1134 | \f |
| 1135 | static Lisp_Object find_handler_clause (); |
| 1136 | |
| 1137 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, |
| 1138 | "Signal an error. Args are ERROR-SYMBOL and associated DATA.\n\ |
| 1139 | This function does not return.\n\n\ |
| 1140 | An error symbol is a symbol with an `error-conditions' property\n\ |
| 1141 | that is a list of condition names.\n\ |
| 1142 | A handler for any of those names will get to handle this signal.\n\ |
| 1143 | The symbol `error' should normally be one of them.\n\ |
| 1144 | \n\ |
| 1145 | DATA should be a list. Its elements are printed as part of the error message.\n\ |
| 1146 | If the signal is handled, DATA is made available to the handler.\n\ |
| 1147 | See also the function `condition-case'.") |
| 1148 | (error_symbol, data) |
| 1149 | Lisp_Object error_symbol, data; |
| 1150 | { |
| 1151 | register struct handler *allhandlers = handlerlist; |
| 1152 | Lisp_Object conditions; |
| 1153 | extern int gc_in_progress; |
| 1154 | extern int waiting_for_input; |
| 1155 | Lisp_Object debugger_value; |
| 1156 | |
| 1157 | quit_error_check (); |
| 1158 | immediate_quit = 0; |
| 1159 | if (gc_in_progress || waiting_for_input) |
| 1160 | abort (); |
| 1161 | |
| 1162 | #ifdef HAVE_X_WINDOWS |
| 1163 | TOTALLY_UNBLOCK_INPUT; |
| 1164 | #endif |
| 1165 | |
| 1166 | conditions = Fget (error_symbol, Qerror_conditions); |
| 1167 | |
| 1168 | for (; handlerlist; handlerlist = handlerlist->next) |
| 1169 | { |
| 1170 | register Lisp_Object clause; |
| 1171 | clause = find_handler_clause (handlerlist->handler, conditions, |
| 1172 | error_symbol, data, &debugger_value); |
| 1173 | |
| 1174 | #if 0 /* Most callers are not prepared to handle gc if this returns. |
| 1175 | So, since this feature is not very useful, take it out. */ |
| 1176 | /* If have called debugger and user wants to continue, |
| 1177 | just return nil. */ |
| 1178 | if (EQ (clause, Qlambda)) |
| 1179 | return debugger_value; |
| 1180 | #else |
| 1181 | if (EQ (clause, Qlambda)) |
| 1182 | { |
| 1183 | /* We can't return values to code which signalled an error, but we |
| 1184 | can continue code which has signalled a quit. */ |
| 1185 | if (EQ (error_symbol, Qquit)) |
| 1186 | return Qnil; |
| 1187 | else |
| 1188 | error ("Cannot return from the debugger in an error"); |
| 1189 | } |
| 1190 | #endif |
| 1191 | |
| 1192 | if (!NILP (clause)) |
| 1193 | { |
| 1194 | Lisp_Object unwind_data; |
| 1195 | struct handler *h = handlerlist; |
| 1196 | |
| 1197 | handlerlist = allhandlers; |
| 1198 | if (data == memory_signal_data) |
| 1199 | unwind_data = memory_signal_data; |
| 1200 | else |
| 1201 | unwind_data = Fcons (error_symbol, data); |
| 1202 | h->chosen_clause = clause; |
| 1203 | unwind_to_catch (h->tag, unwind_data); |
| 1204 | } |
| 1205 | } |
| 1206 | |
| 1207 | handlerlist = allhandlers; |
| 1208 | /* If no handler is present now, try to run the debugger, |
| 1209 | and if that fails, throw to top level. */ |
| 1210 | find_handler_clause (Qerror, conditions, error_symbol, data, &debugger_value); |
| 1211 | Fthrow (Qtop_level, Qt); |
| 1212 | } |
| 1213 | |
| 1214 | /* Return nonzero iff LIST is a non-nil atom or |
| 1215 | a list containing one of CONDITIONS. */ |
| 1216 | |
| 1217 | static int |
| 1218 | wants_debugger (list, conditions) |
| 1219 | Lisp_Object list, conditions; |
| 1220 | { |
| 1221 | if (NILP (list)) |
| 1222 | return 0; |
| 1223 | if (! CONSP (list)) |
| 1224 | return 1; |
| 1225 | |
| 1226 | while (CONSP (conditions)) |
| 1227 | { |
| 1228 | Lisp_Object this, tail; |
| 1229 | this = XCONS (conditions)->car; |
| 1230 | for (tail = list; CONSP (tail); tail = XCONS (tail)->cdr) |
| 1231 | if (EQ (XCONS (tail)->car, this)) |
| 1232 | return 1; |
| 1233 | conditions = XCONS (conditions)->cdr; |
| 1234 | } |
| 1235 | return 0; |
| 1236 | } |
| 1237 | |
| 1238 | /* Value of Qlambda means we have called debugger and user has continued. |
| 1239 | Store value returned from debugger into *DEBUGGER_VALUE_PTR. */ |
| 1240 | |
| 1241 | static Lisp_Object |
| 1242 | find_handler_clause (handlers, conditions, sig, data, debugger_value_ptr) |
| 1243 | Lisp_Object handlers, conditions, sig, data; |
| 1244 | Lisp_Object *debugger_value_ptr; |
| 1245 | { |
| 1246 | register Lisp_Object h; |
| 1247 | register Lisp_Object tem; |
| 1248 | |
| 1249 | if (EQ (handlers, Qt)) /* t is used by handlers for all conditions, set up by C code. */ |
| 1250 | return Qt; |
| 1251 | if (EQ (handlers, Qerror)) /* error is used similarly, but means display a backtrace too */ |
| 1252 | { |
| 1253 | if (wants_debugger (Vstack_trace_on_error, conditions)) |
| 1254 | internal_with_output_to_temp_buffer ("*Backtrace*", Fbacktrace, Qnil); |
| 1255 | if ((EQ (sig, Qquit) |
| 1256 | ? debug_on_quit |
| 1257 | : wants_debugger (Vdebug_on_error, conditions)) |
| 1258 | && when_entered_debugger < num_nonmacro_input_chars) |
| 1259 | { |
| 1260 | int count = specpdl_ptr - specpdl; |
| 1261 | specbind (Qdebug_on_error, Qnil); |
| 1262 | *debugger_value_ptr = |
| 1263 | call_debugger (Fcons (Qerror, |
| 1264 | Fcons (Fcons (sig, data), |
| 1265 | Qnil))); |
| 1266 | return unbind_to (count, Qlambda); |
| 1267 | } |
| 1268 | return Qt; |
| 1269 | } |
| 1270 | for (h = handlers; CONSP (h); h = Fcdr (h)) |
| 1271 | { |
| 1272 | Lisp_Object handler, condit; |
| 1273 | |
| 1274 | handler = Fcar (h); |
| 1275 | if (!CONSP (handler)) |
| 1276 | continue; |
| 1277 | condit = Fcar (handler); |
| 1278 | /* Handle a single condition name in handler HANDLER. */ |
| 1279 | if (SYMBOLP (condit)) |
| 1280 | { |
| 1281 | tem = Fmemq (Fcar (handler), conditions); |
| 1282 | if (!NILP (tem)) |
| 1283 | return handler; |
| 1284 | } |
| 1285 | /* Handle a list of condition names in handler HANDLER. */ |
| 1286 | else if (CONSP (condit)) |
| 1287 | { |
| 1288 | while (CONSP (condit)) |
| 1289 | { |
| 1290 | tem = Fmemq (Fcar (condit), conditions); |
| 1291 | if (!NILP (tem)) |
| 1292 | return handler; |
| 1293 | condit = XCONS (condit)->cdr; |
| 1294 | } |
| 1295 | } |
| 1296 | } |
| 1297 | return Qnil; |
| 1298 | } |
| 1299 | |
| 1300 | /* dump an error message; called like printf */ |
| 1301 | |
| 1302 | /* VARARGS 1 */ |
| 1303 | void |
| 1304 | error (m, a1, a2, a3) |
| 1305 | char *m; |
| 1306 | char *a1, *a2, *a3; |
| 1307 | { |
| 1308 | char buf[200]; |
| 1309 | int size = 200; |
| 1310 | int mlen; |
| 1311 | char *buffer = buf; |
| 1312 | char *args[3]; |
| 1313 | int allocated = 0; |
| 1314 | Lisp_Object string; |
| 1315 | |
| 1316 | args[0] = a1; |
| 1317 | args[1] = a2; |
| 1318 | args[2] = a3; |
| 1319 | |
| 1320 | mlen = strlen (m); |
| 1321 | |
| 1322 | while (1) |
| 1323 | { |
| 1324 | int used = doprnt (buf, size, m, m + mlen, 3, args); |
| 1325 | if (used < size) |
| 1326 | break; |
| 1327 | size *= 2; |
| 1328 | if (allocated) |
| 1329 | buffer = (char *) xrealloc (buffer, size); |
| 1330 | buffer = (char *) xmalloc (size); |
| 1331 | } |
| 1332 | |
| 1333 | string = build_string (buf); |
| 1334 | if (allocated) |
| 1335 | free (buffer); |
| 1336 | |
| 1337 | Fsignal (Qerror, Fcons (string, Qnil)); |
| 1338 | } |
| 1339 | \f |
| 1340 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 1, 0, |
| 1341 | "T if FUNCTION makes provisions for interactive calling.\n\ |
| 1342 | This means it contains a description for how to read arguments to give it.\n\ |
| 1343 | The value is nil for an invalid function or a symbol with no function\n\ |
| 1344 | definition.\n\ |
| 1345 | \n\ |
| 1346 | Interactively callable functions include strings and vectors (treated\n\ |
| 1347 | as keyboard macros), lambda-expressions that contain a top-level call\n\ |
| 1348 | to `interactive', autoload definitions made by `autoload' with non-nil\n\ |
| 1349 | fourth argument, and some of the built-in functions of Lisp.\n\ |
| 1350 | \n\ |
| 1351 | Also, a symbol satisfies `commandp' if its function definition does so.") |
| 1352 | (function) |
| 1353 | Lisp_Object function; |
| 1354 | { |
| 1355 | register Lisp_Object fun; |
| 1356 | register Lisp_Object funcar; |
| 1357 | register Lisp_Object tem; |
| 1358 | register int i = 0; |
| 1359 | |
| 1360 | fun = function; |
| 1361 | |
| 1362 | fun = indirect_function (fun); |
| 1363 | if (EQ (fun, Qunbound)) |
| 1364 | return Qnil; |
| 1365 | |
| 1366 | /* Emacs primitives are interactive if their DEFUN specifies an |
| 1367 | interactive spec. */ |
| 1368 | if (XTYPE (fun) == Lisp_Subr) |
| 1369 | { |
| 1370 | if (XSUBR (fun)->prompt) |
| 1371 | return Qt; |
| 1372 | else |
| 1373 | return Qnil; |
| 1374 | } |
| 1375 | |
| 1376 | /* Bytecode objects are interactive if they are long enough to |
| 1377 | have an element whose index is COMPILED_INTERACTIVE, which is |
| 1378 | where the interactive spec is stored. */ |
| 1379 | else if (XTYPE (fun) == Lisp_Compiled) |
| 1380 | return (XVECTOR (fun)->size > COMPILED_INTERACTIVE |
| 1381 | ? Qt : Qnil); |
| 1382 | |
| 1383 | /* Strings and vectors are keyboard macros. */ |
| 1384 | if (XTYPE (fun) == Lisp_String |
| 1385 | || XTYPE (fun) == Lisp_Vector) |
| 1386 | return Qt; |
| 1387 | |
| 1388 | /* Lists may represent commands. */ |
| 1389 | if (!CONSP (fun)) |
| 1390 | return Qnil; |
| 1391 | funcar = Fcar (fun); |
| 1392 | if (XTYPE (funcar) != Lisp_Symbol) |
| 1393 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
| 1394 | if (EQ (funcar, Qlambda)) |
| 1395 | return Fassq (Qinteractive, Fcdr (Fcdr (fun))); |
| 1396 | if (EQ (funcar, Qmocklisp)) |
| 1397 | return Qt; /* All mocklisp functions can be called interactively */ |
| 1398 | if (EQ (funcar, Qautoload)) |
| 1399 | return Fcar (Fcdr (Fcdr (Fcdr (fun)))); |
| 1400 | else |
| 1401 | return Qnil; |
| 1402 | } |
| 1403 | |
| 1404 | /* ARGSUSED */ |
| 1405 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, |
| 1406 | "Define FUNCTION to autoload from FILE.\n\ |
| 1407 | FUNCTION is a symbol; FILE is a file name string to pass to `load'.\n\ |
| 1408 | Third arg DOCSTRING is documentation for the function.\n\ |
| 1409 | Fourth arg INTERACTIVE if non-nil says function can be called interactively.\n\ |
| 1410 | Fifth arg TYPE indicates the type of the object:\n\ |
| 1411 | nil or omitted says FUNCTION is a function,\n\ |
| 1412 | `keymap' says FUNCTION is really a keymap, and\n\ |
| 1413 | `macro' or t says FUNCTION is really a macro.\n\ |
| 1414 | Third through fifth args give info about the real definition.\n\ |
| 1415 | They default to nil.\n\ |
| 1416 | If FUNCTION is already defined other than as an autoload,\n\ |
| 1417 | this does nothing and returns nil.") |
| 1418 | (function, file, docstring, interactive, type) |
| 1419 | Lisp_Object function, file, docstring, interactive, type; |
| 1420 | { |
| 1421 | #ifdef NO_ARG_ARRAY |
| 1422 | Lisp_Object args[4]; |
| 1423 | #endif |
| 1424 | |
| 1425 | CHECK_SYMBOL (function, 0); |
| 1426 | CHECK_STRING (file, 1); |
| 1427 | |
| 1428 | /* If function is defined and not as an autoload, don't override */ |
| 1429 | if (!EQ (XSYMBOL (function)->function, Qunbound) |
| 1430 | && !(XTYPE (XSYMBOL (function)->function) == Lisp_Cons |
| 1431 | && EQ (XCONS (XSYMBOL (function)->function)->car, Qautoload))) |
| 1432 | return Qnil; |
| 1433 | |
| 1434 | #ifdef NO_ARG_ARRAY |
| 1435 | args[0] = file; |
| 1436 | args[1] = docstring; |
| 1437 | args[2] = interactive; |
| 1438 | args[3] = type; |
| 1439 | |
| 1440 | return Ffset (function, Fcons (Qautoload, Flist (4, &args[0]))); |
| 1441 | #else /* NO_ARG_ARRAY */ |
| 1442 | return Ffset (function, Fcons (Qautoload, Flist (4, &file))); |
| 1443 | #endif /* not NO_ARG_ARRAY */ |
| 1444 | } |
| 1445 | |
| 1446 | Lisp_Object |
| 1447 | un_autoload (oldqueue) |
| 1448 | Lisp_Object oldqueue; |
| 1449 | { |
| 1450 | register Lisp_Object queue, first, second; |
| 1451 | |
| 1452 | /* Queue to unwind is current value of Vautoload_queue. |
| 1453 | oldqueue is the shadowed value to leave in Vautoload_queue. */ |
| 1454 | queue = Vautoload_queue; |
| 1455 | Vautoload_queue = oldqueue; |
| 1456 | while (CONSP (queue)) |
| 1457 | { |
| 1458 | first = Fcar (queue); |
| 1459 | second = Fcdr (first); |
| 1460 | first = Fcar (first); |
| 1461 | if (EQ (second, Qnil)) |
| 1462 | Vfeatures = first; |
| 1463 | else |
| 1464 | Ffset (first, second); |
| 1465 | queue = Fcdr (queue); |
| 1466 | } |
| 1467 | return Qnil; |
| 1468 | } |
| 1469 | |
| 1470 | do_autoload (fundef, funname) |
| 1471 | Lisp_Object fundef, funname; |
| 1472 | { |
| 1473 | int count = specpdl_ptr - specpdl; |
| 1474 | Lisp_Object fun, val, queue, first, second; |
| 1475 | |
| 1476 | fun = funname; |
| 1477 | CHECK_SYMBOL (funname, 0); |
| 1478 | |
| 1479 | /* Value saved here is to be restored into Vautoload_queue */ |
| 1480 | record_unwind_protect (un_autoload, Vautoload_queue); |
| 1481 | Vautoload_queue = Qt; |
| 1482 | Fload (Fcar (Fcdr (fundef)), Qnil, noninteractive ? Qt : Qnil, Qnil); |
| 1483 | |
| 1484 | /* Save the old autoloads, in case we ever do an unload. */ |
| 1485 | queue = Vautoload_queue; |
| 1486 | while (CONSP (queue)) |
| 1487 | { |
| 1488 | first = Fcar (queue); |
| 1489 | second = Fcdr (first); |
| 1490 | first = Fcar (first); |
| 1491 | |
| 1492 | /* Note: This test is subtle. The cdr of an autoload-queue entry |
| 1493 | may be an atom if the autoload entry was generated by a defalias |
| 1494 | or fset. */ |
| 1495 | if (CONSP (second)) |
| 1496 | Fput (first, Qautoload, (Fcdr (second))); |
| 1497 | |
| 1498 | queue = Fcdr (queue); |
| 1499 | } |
| 1500 | |
| 1501 | /* Once loading finishes, don't undo it. */ |
| 1502 | Vautoload_queue = Qt; |
| 1503 | unbind_to (count, Qnil); |
| 1504 | |
| 1505 | fun = Findirect_function (fun); |
| 1506 | |
| 1507 | if (!NILP (Fequal (fun, fundef))) |
| 1508 | error ("Autoloading failed to define function %s", |
| 1509 | XSYMBOL (funname)->name->data); |
| 1510 | } |
| 1511 | \f |
| 1512 | DEFUN ("eval", Feval, Seval, 1, 1, 0, |
| 1513 | "Evaluate FORM and return its value.") |
| 1514 | (form) |
| 1515 | Lisp_Object form; |
| 1516 | { |
| 1517 | Lisp_Object fun, val, original_fun, original_args; |
| 1518 | Lisp_Object funcar; |
| 1519 | struct backtrace backtrace; |
| 1520 | struct gcpro gcpro1, gcpro2, gcpro3; |
| 1521 | |
| 1522 | if (XTYPE (form) == Lisp_Symbol) |
| 1523 | { |
| 1524 | if (EQ (Vmocklisp_arguments, Qt)) |
| 1525 | return Fsymbol_value (form); |
| 1526 | val = Fsymbol_value (form); |
| 1527 | if (NILP (val)) |
| 1528 | XFASTINT (val) = 0; |
| 1529 | else if (EQ (val, Qt)) |
| 1530 | XFASTINT (val) = 1; |
| 1531 | return val; |
| 1532 | } |
| 1533 | if (!CONSP (form)) |
| 1534 | return form; |
| 1535 | |
| 1536 | QUIT; |
| 1537 | if (consing_since_gc > gc_cons_threshold) |
| 1538 | { |
| 1539 | GCPRO1 (form); |
| 1540 | Fgarbage_collect (); |
| 1541 | UNGCPRO; |
| 1542 | } |
| 1543 | |
| 1544 | if (++lisp_eval_depth > max_lisp_eval_depth) |
| 1545 | { |
| 1546 | if (max_lisp_eval_depth < 100) |
| 1547 | max_lisp_eval_depth = 100; |
| 1548 | if (lisp_eval_depth > max_lisp_eval_depth) |
| 1549 | error ("Lisp nesting exceeds max-lisp-eval-depth"); |
| 1550 | } |
| 1551 | |
| 1552 | original_fun = Fcar (form); |
| 1553 | original_args = Fcdr (form); |
| 1554 | |
| 1555 | backtrace.next = backtrace_list; |
| 1556 | backtrace_list = &backtrace; |
| 1557 | backtrace.function = &original_fun; /* This also protects them from gc */ |
| 1558 | backtrace.args = &original_args; |
| 1559 | backtrace.nargs = UNEVALLED; |
| 1560 | backtrace.evalargs = 1; |
| 1561 | backtrace.debug_on_exit = 0; |
| 1562 | |
| 1563 | if (debug_on_next_call) |
| 1564 | do_debug_on_call (Qt); |
| 1565 | |
| 1566 | /* At this point, only original_fun and original_args |
| 1567 | have values that will be used below */ |
| 1568 | retry: |
| 1569 | fun = Findirect_function (original_fun); |
| 1570 | |
| 1571 | if (XTYPE (fun) == Lisp_Subr) |
| 1572 | { |
| 1573 | Lisp_Object numargs; |
| 1574 | Lisp_Object argvals[7]; |
| 1575 | Lisp_Object args_left; |
| 1576 | register int i, maxargs; |
| 1577 | |
| 1578 | args_left = original_args; |
| 1579 | numargs = Flength (args_left); |
| 1580 | |
| 1581 | if (XINT (numargs) < XSUBR (fun)->min_args || |
| 1582 | (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < XINT (numargs))) |
| 1583 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil))); |
| 1584 | |
| 1585 | if (XSUBR (fun)->max_args == UNEVALLED) |
| 1586 | { |
| 1587 | backtrace.evalargs = 0; |
| 1588 | val = (*XSUBR (fun)->function) (args_left); |
| 1589 | goto done; |
| 1590 | } |
| 1591 | |
| 1592 | if (XSUBR (fun)->max_args == MANY) |
| 1593 | { |
| 1594 | /* Pass a vector of evaluated arguments */ |
| 1595 | Lisp_Object *vals; |
| 1596 | register int argnum = 0; |
| 1597 | |
| 1598 | vals = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); |
| 1599 | |
| 1600 | GCPRO3 (args_left, fun, fun); |
| 1601 | gcpro3.var = vals; |
| 1602 | gcpro3.nvars = 0; |
| 1603 | |
| 1604 | while (!NILP (args_left)) |
| 1605 | { |
| 1606 | vals[argnum++] = Feval (Fcar (args_left)); |
| 1607 | args_left = Fcdr (args_left); |
| 1608 | gcpro3.nvars = argnum; |
| 1609 | } |
| 1610 | |
| 1611 | backtrace.args = vals; |
| 1612 | backtrace.nargs = XINT (numargs); |
| 1613 | |
| 1614 | val = (*XSUBR (fun)->function) (XINT (numargs), vals); |
| 1615 | UNGCPRO; |
| 1616 | goto done; |
| 1617 | } |
| 1618 | |
| 1619 | GCPRO3 (args_left, fun, fun); |
| 1620 | gcpro3.var = argvals; |
| 1621 | gcpro3.nvars = 0; |
| 1622 | |
| 1623 | maxargs = XSUBR (fun)->max_args; |
| 1624 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) |
| 1625 | { |
| 1626 | argvals[i] = Feval (Fcar (args_left)); |
| 1627 | gcpro3.nvars = ++i; |
| 1628 | } |
| 1629 | |
| 1630 | UNGCPRO; |
| 1631 | |
| 1632 | backtrace.args = argvals; |
| 1633 | backtrace.nargs = XINT (numargs); |
| 1634 | |
| 1635 | switch (i) |
| 1636 | { |
| 1637 | case 0: |
| 1638 | val = (*XSUBR (fun)->function) (); |
| 1639 | goto done; |
| 1640 | case 1: |
| 1641 | val = (*XSUBR (fun)->function) (argvals[0]); |
| 1642 | goto done; |
| 1643 | case 2: |
| 1644 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1]); |
| 1645 | goto done; |
| 1646 | case 3: |
| 1647 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], |
| 1648 | argvals[2]); |
| 1649 | goto done; |
| 1650 | case 4: |
| 1651 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], |
| 1652 | argvals[2], argvals[3]); |
| 1653 | goto done; |
| 1654 | case 5: |
| 1655 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], |
| 1656 | argvals[3], argvals[4]); |
| 1657 | goto done; |
| 1658 | case 6: |
| 1659 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], |
| 1660 | argvals[3], argvals[4], argvals[5]); |
| 1661 | goto done; |
| 1662 | case 7: |
| 1663 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], |
| 1664 | argvals[3], argvals[4], argvals[5], |
| 1665 | argvals[6]); |
| 1666 | goto done; |
| 1667 | |
| 1668 | default: |
| 1669 | /* Someone has created a subr that takes more arguments than |
| 1670 | is supported by this code. We need to either rewrite the |
| 1671 | subr to use a different argument protocol, or add more |
| 1672 | cases to this switch. */ |
| 1673 | abort (); |
| 1674 | } |
| 1675 | } |
| 1676 | if (XTYPE (fun) == Lisp_Compiled) |
| 1677 | val = apply_lambda (fun, original_args, 1); |
| 1678 | else |
| 1679 | { |
| 1680 | if (!CONSP (fun)) |
| 1681 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
| 1682 | funcar = Fcar (fun); |
| 1683 | if (XTYPE (funcar) != Lisp_Symbol) |
| 1684 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
| 1685 | if (EQ (funcar, Qautoload)) |
| 1686 | { |
| 1687 | do_autoload (fun, original_fun); |
| 1688 | goto retry; |
| 1689 | } |
| 1690 | if (EQ (funcar, Qmacro)) |
| 1691 | val = Feval (apply1 (Fcdr (fun), original_args)); |
| 1692 | else if (EQ (funcar, Qlambda)) |
| 1693 | val = apply_lambda (fun, original_args, 1); |
| 1694 | else if (EQ (funcar, Qmocklisp)) |
| 1695 | val = ml_apply (fun, original_args); |
| 1696 | else |
| 1697 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
| 1698 | } |
| 1699 | done: |
| 1700 | if (!EQ (Vmocklisp_arguments, Qt)) |
| 1701 | { |
| 1702 | if (NILP (val)) |
| 1703 | XFASTINT (val) = 0; |
| 1704 | else if (EQ (val, Qt)) |
| 1705 | XFASTINT (val) = 1; |
| 1706 | } |
| 1707 | lisp_eval_depth--; |
| 1708 | if (backtrace.debug_on_exit) |
| 1709 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); |
| 1710 | backtrace_list = backtrace.next; |
| 1711 | return val; |
| 1712 | } |
| 1713 | \f |
| 1714 | DEFUN ("apply", Fapply, Sapply, 2, MANY, 0, |
| 1715 | "Call FUNCTION with our remaining args, using our last arg as list of args.\n\ |
| 1716 | Thus, (apply '+ 1 2 '(3 4)) returns 10.") |
| 1717 | (nargs, args) |
| 1718 | int nargs; |
| 1719 | Lisp_Object *args; |
| 1720 | { |
| 1721 | register int i, numargs; |
| 1722 | register Lisp_Object spread_arg; |
| 1723 | register Lisp_Object *funcall_args; |
| 1724 | Lisp_Object fun; |
| 1725 | struct gcpro gcpro1; |
| 1726 | |
| 1727 | fun = args [0]; |
| 1728 | funcall_args = 0; |
| 1729 | spread_arg = args [nargs - 1]; |
| 1730 | CHECK_LIST (spread_arg, nargs); |
| 1731 | |
| 1732 | numargs = XINT (Flength (spread_arg)); |
| 1733 | |
| 1734 | if (numargs == 0) |
| 1735 | return Ffuncall (nargs - 1, args); |
| 1736 | else if (numargs == 1) |
| 1737 | { |
| 1738 | args [nargs - 1] = XCONS (spread_arg)->car; |
| 1739 | return Ffuncall (nargs, args); |
| 1740 | } |
| 1741 | |
| 1742 | numargs += nargs - 2; |
| 1743 | |
| 1744 | fun = indirect_function (fun); |
| 1745 | if (EQ (fun, Qunbound)) |
| 1746 | { |
| 1747 | /* Let funcall get the error */ |
| 1748 | fun = args[0]; |
| 1749 | goto funcall; |
| 1750 | } |
| 1751 | |
| 1752 | if (XTYPE (fun) == Lisp_Subr) |
| 1753 | { |
| 1754 | if (numargs < XSUBR (fun)->min_args |
| 1755 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) |
| 1756 | goto funcall; /* Let funcall get the error */ |
| 1757 | else if (XSUBR (fun)->max_args > numargs) |
| 1758 | { |
| 1759 | /* Avoid making funcall cons up a yet another new vector of arguments |
| 1760 | by explicitly supplying nil's for optional values */ |
| 1761 | funcall_args = (Lisp_Object *) alloca ((1 + XSUBR (fun)->max_args) |
| 1762 | * sizeof (Lisp_Object)); |
| 1763 | for (i = numargs; i < XSUBR (fun)->max_args;) |
| 1764 | funcall_args[++i] = Qnil; |
| 1765 | GCPRO1 (*funcall_args); |
| 1766 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; |
| 1767 | } |
| 1768 | } |
| 1769 | funcall: |
| 1770 | /* We add 1 to numargs because funcall_args includes the |
| 1771 | function itself as well as its arguments. */ |
| 1772 | if (!funcall_args) |
| 1773 | { |
| 1774 | funcall_args = (Lisp_Object *) alloca ((1 + numargs) |
| 1775 | * sizeof (Lisp_Object)); |
| 1776 | GCPRO1 (*funcall_args); |
| 1777 | gcpro1.nvars = 1 + numargs; |
| 1778 | } |
| 1779 | |
| 1780 | bcopy (args, funcall_args, nargs * sizeof (Lisp_Object)); |
| 1781 | /* Spread the last arg we got. Its first element goes in |
| 1782 | the slot that it used to occupy, hence this value of I. */ |
| 1783 | i = nargs - 1; |
| 1784 | while (!NILP (spread_arg)) |
| 1785 | { |
| 1786 | funcall_args [i++] = XCONS (spread_arg)->car; |
| 1787 | spread_arg = XCONS (spread_arg)->cdr; |
| 1788 | } |
| 1789 | |
| 1790 | RETURN_UNGCPRO (Ffuncall (gcpro1.nvars, funcall_args)); |
| 1791 | } |
| 1792 | \f |
| 1793 | /* Apply fn to arg */ |
| 1794 | Lisp_Object |
| 1795 | apply1 (fn, arg) |
| 1796 | Lisp_Object fn, arg; |
| 1797 | { |
| 1798 | struct gcpro gcpro1; |
| 1799 | |
| 1800 | GCPRO1 (fn); |
| 1801 | if (NILP (arg)) |
| 1802 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
| 1803 | gcpro1.nvars = 2; |
| 1804 | #ifdef NO_ARG_ARRAY |
| 1805 | { |
| 1806 | Lisp_Object args[2]; |
| 1807 | args[0] = fn; |
| 1808 | args[1] = arg; |
| 1809 | gcpro1.var = args; |
| 1810 | RETURN_UNGCPRO (Fapply (2, args)); |
| 1811 | } |
| 1812 | #else /* not NO_ARG_ARRAY */ |
| 1813 | RETURN_UNGCPRO (Fapply (2, &fn)); |
| 1814 | #endif /* not NO_ARG_ARRAY */ |
| 1815 | } |
| 1816 | |
| 1817 | /* Call function fn on no arguments */ |
| 1818 | Lisp_Object |
| 1819 | call0 (fn) |
| 1820 | Lisp_Object fn; |
| 1821 | { |
| 1822 | struct gcpro gcpro1; |
| 1823 | |
| 1824 | GCPRO1 (fn); |
| 1825 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
| 1826 | } |
| 1827 | |
| 1828 | /* Call function fn with 1 argument arg1 */ |
| 1829 | /* ARGSUSED */ |
| 1830 | Lisp_Object |
| 1831 | call1 (fn, arg1) |
| 1832 | Lisp_Object fn, arg1; |
| 1833 | { |
| 1834 | struct gcpro gcpro1; |
| 1835 | #ifdef NO_ARG_ARRAY |
| 1836 | Lisp_Object args[2]; |
| 1837 | |
| 1838 | args[0] = fn; |
| 1839 | args[1] = arg1; |
| 1840 | GCPRO1 (args[0]); |
| 1841 | gcpro1.nvars = 2; |
| 1842 | RETURN_UNGCPRO (Ffuncall (2, args)); |
| 1843 | #else /* not NO_ARG_ARRAY */ |
| 1844 | GCPRO1 (fn); |
| 1845 | gcpro1.nvars = 2; |
| 1846 | RETURN_UNGCPRO (Ffuncall (2, &fn)); |
| 1847 | #endif /* not NO_ARG_ARRAY */ |
| 1848 | } |
| 1849 | |
| 1850 | /* Call function fn with 2 arguments arg1, arg2 */ |
| 1851 | /* ARGSUSED */ |
| 1852 | Lisp_Object |
| 1853 | call2 (fn, arg1, arg2) |
| 1854 | Lisp_Object fn, arg1, arg2; |
| 1855 | { |
| 1856 | struct gcpro gcpro1; |
| 1857 | #ifdef NO_ARG_ARRAY |
| 1858 | Lisp_Object args[3]; |
| 1859 | args[0] = fn; |
| 1860 | args[1] = arg1; |
| 1861 | args[2] = arg2; |
| 1862 | GCPRO1 (args[0]); |
| 1863 | gcpro1.nvars = 3; |
| 1864 | RETURN_UNGCPRO (Ffuncall (3, args)); |
| 1865 | #else /* not NO_ARG_ARRAY */ |
| 1866 | GCPRO1 (fn); |
| 1867 | gcpro1.nvars = 3; |
| 1868 | RETURN_UNGCPRO (Ffuncall (3, &fn)); |
| 1869 | #endif /* not NO_ARG_ARRAY */ |
| 1870 | } |
| 1871 | |
| 1872 | /* Call function fn with 3 arguments arg1, arg2, arg3 */ |
| 1873 | /* ARGSUSED */ |
| 1874 | Lisp_Object |
| 1875 | call3 (fn, arg1, arg2, arg3) |
| 1876 | Lisp_Object fn, arg1, arg2, arg3; |
| 1877 | { |
| 1878 | struct gcpro gcpro1; |
| 1879 | #ifdef NO_ARG_ARRAY |
| 1880 | Lisp_Object args[4]; |
| 1881 | args[0] = fn; |
| 1882 | args[1] = arg1; |
| 1883 | args[2] = arg2; |
| 1884 | args[3] = arg3; |
| 1885 | GCPRO1 (args[0]); |
| 1886 | gcpro1.nvars = 4; |
| 1887 | RETURN_UNGCPRO (Ffuncall (4, args)); |
| 1888 | #else /* not NO_ARG_ARRAY */ |
| 1889 | GCPRO1 (fn); |
| 1890 | gcpro1.nvars = 4; |
| 1891 | RETURN_UNGCPRO (Ffuncall (4, &fn)); |
| 1892 | #endif /* not NO_ARG_ARRAY */ |
| 1893 | } |
| 1894 | |
| 1895 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */ |
| 1896 | /* ARGSUSED */ |
| 1897 | Lisp_Object |
| 1898 | call4 (fn, arg1, arg2, arg3, arg4) |
| 1899 | Lisp_Object fn, arg1, arg2, arg3, arg4; |
| 1900 | { |
| 1901 | struct gcpro gcpro1; |
| 1902 | #ifdef NO_ARG_ARRAY |
| 1903 | Lisp_Object args[5]; |
| 1904 | args[0] = fn; |
| 1905 | args[1] = arg1; |
| 1906 | args[2] = arg2; |
| 1907 | args[3] = arg3; |
| 1908 | args[4] = arg4; |
| 1909 | GCPRO1 (args[0]); |
| 1910 | gcpro1.nvars = 5; |
| 1911 | RETURN_UNGCPRO (Ffuncall (5, args)); |
| 1912 | #else /* not NO_ARG_ARRAY */ |
| 1913 | GCPRO1 (fn); |
| 1914 | gcpro1.nvars = 5; |
| 1915 | RETURN_UNGCPRO (Ffuncall (5, &fn)); |
| 1916 | #endif /* not NO_ARG_ARRAY */ |
| 1917 | } |
| 1918 | |
| 1919 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */ |
| 1920 | /* ARGSUSED */ |
| 1921 | Lisp_Object |
| 1922 | call5 (fn, arg1, arg2, arg3, arg4, arg5) |
| 1923 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5; |
| 1924 | { |
| 1925 | struct gcpro gcpro1; |
| 1926 | #ifdef NO_ARG_ARRAY |
| 1927 | Lisp_Object args[6]; |
| 1928 | args[0] = fn; |
| 1929 | args[1] = arg1; |
| 1930 | args[2] = arg2; |
| 1931 | args[3] = arg3; |
| 1932 | args[4] = arg4; |
| 1933 | args[5] = arg5; |
| 1934 | GCPRO1 (args[0]); |
| 1935 | gcpro1.nvars = 6; |
| 1936 | RETURN_UNGCPRO (Ffuncall (6, args)); |
| 1937 | #else /* not NO_ARG_ARRAY */ |
| 1938 | GCPRO1 (fn); |
| 1939 | gcpro1.nvars = 6; |
| 1940 | RETURN_UNGCPRO (Ffuncall (6, &fn)); |
| 1941 | #endif /* not NO_ARG_ARRAY */ |
| 1942 | } |
| 1943 | |
| 1944 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */ |
| 1945 | /* ARGSUSED */ |
| 1946 | Lisp_Object |
| 1947 | call6 (fn, arg1, arg2, arg3, arg4, arg5, arg6) |
| 1948 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5, arg6; |
| 1949 | { |
| 1950 | struct gcpro gcpro1; |
| 1951 | #ifdef NO_ARG_ARRAY |
| 1952 | Lisp_Object args[7]; |
| 1953 | args[0] = fn; |
| 1954 | args[1] = arg1; |
| 1955 | args[2] = arg2; |
| 1956 | args[3] = arg3; |
| 1957 | args[4] = arg4; |
| 1958 | args[5] = arg5; |
| 1959 | args[6] = arg6; |
| 1960 | GCPRO1 (args[0]); |
| 1961 | gcpro1.nvars = 7; |
| 1962 | RETURN_UNGCPRO (Ffuncall (7, args)); |
| 1963 | #else /* not NO_ARG_ARRAY */ |
| 1964 | GCPRO1 (fn); |
| 1965 | gcpro1.nvars = 7; |
| 1966 | RETURN_UNGCPRO (Ffuncall (7, &fn)); |
| 1967 | #endif /* not NO_ARG_ARRAY */ |
| 1968 | } |
| 1969 | |
| 1970 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
| 1971 | "Call first argument as a function, passing remaining arguments to it.\n\ |
| 1972 | Thus, (funcall 'cons 'x 'y) returns (x . y).") |
| 1973 | (nargs, args) |
| 1974 | int nargs; |
| 1975 | Lisp_Object *args; |
| 1976 | { |
| 1977 | Lisp_Object fun; |
| 1978 | Lisp_Object funcar; |
| 1979 | int numargs = nargs - 1; |
| 1980 | Lisp_Object lisp_numargs; |
| 1981 | Lisp_Object val; |
| 1982 | struct backtrace backtrace; |
| 1983 | register Lisp_Object *internal_args; |
| 1984 | register int i; |
| 1985 | |
| 1986 | QUIT; |
| 1987 | if (consing_since_gc > gc_cons_threshold) |
| 1988 | Fgarbage_collect (); |
| 1989 | |
| 1990 | if (++lisp_eval_depth > max_lisp_eval_depth) |
| 1991 | { |
| 1992 | if (max_lisp_eval_depth < 100) |
| 1993 | max_lisp_eval_depth = 100; |
| 1994 | if (lisp_eval_depth > max_lisp_eval_depth) |
| 1995 | error ("Lisp nesting exceeds max-lisp-eval-depth"); |
| 1996 | } |
| 1997 | |
| 1998 | backtrace.next = backtrace_list; |
| 1999 | backtrace_list = &backtrace; |
| 2000 | backtrace.function = &args[0]; |
| 2001 | backtrace.args = &args[1]; |
| 2002 | backtrace.nargs = nargs - 1; |
| 2003 | backtrace.evalargs = 0; |
| 2004 | backtrace.debug_on_exit = 0; |
| 2005 | |
| 2006 | if (debug_on_next_call) |
| 2007 | do_debug_on_call (Qlambda); |
| 2008 | |
| 2009 | retry: |
| 2010 | |
| 2011 | fun = args[0]; |
| 2012 | |
| 2013 | fun = Findirect_function (fun); |
| 2014 | |
| 2015 | if (XTYPE (fun) == Lisp_Subr) |
| 2016 | { |
| 2017 | if (numargs < XSUBR (fun)->min_args |
| 2018 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) |
| 2019 | { |
| 2020 | XFASTINT (lisp_numargs) = numargs; |
| 2021 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (lisp_numargs, Qnil))); |
| 2022 | } |
| 2023 | |
| 2024 | if (XSUBR (fun)->max_args == UNEVALLED) |
| 2025 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
| 2026 | |
| 2027 | if (XSUBR (fun)->max_args == MANY) |
| 2028 | { |
| 2029 | val = (*XSUBR (fun)->function) (numargs, args + 1); |
| 2030 | goto done; |
| 2031 | } |
| 2032 | |
| 2033 | if (XSUBR (fun)->max_args > numargs) |
| 2034 | { |
| 2035 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); |
| 2036 | bcopy (args + 1, internal_args, numargs * sizeof (Lisp_Object)); |
| 2037 | for (i = numargs; i < XSUBR (fun)->max_args; i++) |
| 2038 | internal_args[i] = Qnil; |
| 2039 | } |
| 2040 | else |
| 2041 | internal_args = args + 1; |
| 2042 | switch (XSUBR (fun)->max_args) |
| 2043 | { |
| 2044 | case 0: |
| 2045 | val = (*XSUBR (fun)->function) (); |
| 2046 | goto done; |
| 2047 | case 1: |
| 2048 | val = (*XSUBR (fun)->function) (internal_args[0]); |
| 2049 | goto done; |
| 2050 | case 2: |
| 2051 | val = (*XSUBR (fun)->function) (internal_args[0], |
| 2052 | internal_args[1]); |
| 2053 | goto done; |
| 2054 | case 3: |
| 2055 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], |
| 2056 | internal_args[2]); |
| 2057 | goto done; |
| 2058 | case 4: |
| 2059 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], |
| 2060 | internal_args[2], |
| 2061 | internal_args[3]); |
| 2062 | goto done; |
| 2063 | case 5: |
| 2064 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], |
| 2065 | internal_args[2], internal_args[3], |
| 2066 | internal_args[4]); |
| 2067 | goto done; |
| 2068 | case 6: |
| 2069 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], |
| 2070 | internal_args[2], internal_args[3], |
| 2071 | internal_args[4], internal_args[5]); |
| 2072 | goto done; |
| 2073 | case 7: |
| 2074 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], |
| 2075 | internal_args[2], internal_args[3], |
| 2076 | internal_args[4], internal_args[5], |
| 2077 | internal_args[6]); |
| 2078 | goto done; |
| 2079 | |
| 2080 | default: |
| 2081 | |
| 2082 | /* If a subr takes more than 6 arguments without using MANY |
| 2083 | or UNEVALLED, we need to extend this function to support it. |
| 2084 | Until this is done, there is no way to call the function. */ |
| 2085 | abort (); |
| 2086 | } |
| 2087 | } |
| 2088 | if (XTYPE (fun) == Lisp_Compiled) |
| 2089 | val = funcall_lambda (fun, numargs, args + 1); |
| 2090 | else |
| 2091 | { |
| 2092 | if (!CONSP (fun)) |
| 2093 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
| 2094 | funcar = Fcar (fun); |
| 2095 | if (XTYPE (funcar) != Lisp_Symbol) |
| 2096 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
| 2097 | if (EQ (funcar, Qlambda)) |
| 2098 | val = funcall_lambda (fun, numargs, args + 1); |
| 2099 | else if (EQ (funcar, Qmocklisp)) |
| 2100 | val = ml_apply (fun, Flist (numargs, args + 1)); |
| 2101 | else if (EQ (funcar, Qautoload)) |
| 2102 | { |
| 2103 | do_autoload (fun, args[0]); |
| 2104 | goto retry; |
| 2105 | } |
| 2106 | else |
| 2107 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
| 2108 | } |
| 2109 | done: |
| 2110 | lisp_eval_depth--; |
| 2111 | if (backtrace.debug_on_exit) |
| 2112 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); |
| 2113 | backtrace_list = backtrace.next; |
| 2114 | return val; |
| 2115 | } |
| 2116 | \f |
| 2117 | Lisp_Object |
| 2118 | apply_lambda (fun, args, eval_flag) |
| 2119 | Lisp_Object fun, args; |
| 2120 | int eval_flag; |
| 2121 | { |
| 2122 | Lisp_Object args_left; |
| 2123 | Lisp_Object numargs; |
| 2124 | register Lisp_Object *arg_vector; |
| 2125 | struct gcpro gcpro1, gcpro2, gcpro3; |
| 2126 | register int i; |
| 2127 | register Lisp_Object tem; |
| 2128 | |
| 2129 | numargs = Flength (args); |
| 2130 | arg_vector = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); |
| 2131 | args_left = args; |
| 2132 | |
| 2133 | GCPRO3 (*arg_vector, args_left, fun); |
| 2134 | gcpro1.nvars = 0; |
| 2135 | |
| 2136 | for (i = 0; i < XINT (numargs);) |
| 2137 | { |
| 2138 | tem = Fcar (args_left), args_left = Fcdr (args_left); |
| 2139 | if (eval_flag) tem = Feval (tem); |
| 2140 | arg_vector[i++] = tem; |
| 2141 | gcpro1.nvars = i; |
| 2142 | } |
| 2143 | |
| 2144 | UNGCPRO; |
| 2145 | |
| 2146 | if (eval_flag) |
| 2147 | { |
| 2148 | backtrace_list->args = arg_vector; |
| 2149 | backtrace_list->nargs = i; |
| 2150 | } |
| 2151 | backtrace_list->evalargs = 0; |
| 2152 | tem = funcall_lambda (fun, XINT (numargs), arg_vector); |
| 2153 | |
| 2154 | /* Do the debug-on-exit now, while arg_vector still exists. */ |
| 2155 | if (backtrace_list->debug_on_exit) |
| 2156 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); |
| 2157 | /* Don't do it again when we return to eval. */ |
| 2158 | backtrace_list->debug_on_exit = 0; |
| 2159 | return tem; |
| 2160 | } |
| 2161 | |
| 2162 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR |
| 2163 | and return the result of evaluation. |
| 2164 | FUN must be either a lambda-expression or a compiled-code object. */ |
| 2165 | |
| 2166 | Lisp_Object |
| 2167 | funcall_lambda (fun, nargs, arg_vector) |
| 2168 | Lisp_Object fun; |
| 2169 | int nargs; |
| 2170 | register Lisp_Object *arg_vector; |
| 2171 | { |
| 2172 | Lisp_Object val, tem; |
| 2173 | register Lisp_Object syms_left; |
| 2174 | Lisp_Object numargs; |
| 2175 | register Lisp_Object next; |
| 2176 | int count = specpdl_ptr - specpdl; |
| 2177 | register int i; |
| 2178 | int optional = 0, rest = 0; |
| 2179 | |
| 2180 | specbind (Qmocklisp_arguments, Qt); /* t means NOT mocklisp! */ |
| 2181 | |
| 2182 | XFASTINT (numargs) = nargs; |
| 2183 | |
| 2184 | if (XTYPE (fun) == Lisp_Cons) |
| 2185 | syms_left = Fcar (Fcdr (fun)); |
| 2186 | else if (XTYPE (fun) == Lisp_Compiled) |
| 2187 | syms_left = XVECTOR (fun)->contents[COMPILED_ARGLIST]; |
| 2188 | else abort (); |
| 2189 | |
| 2190 | i = 0; |
| 2191 | for (; !NILP (syms_left); syms_left = Fcdr (syms_left)) |
| 2192 | { |
| 2193 | QUIT; |
| 2194 | next = Fcar (syms_left); |
| 2195 | while (XTYPE (next) != Lisp_Symbol) |
| 2196 | next = Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
| 2197 | if (EQ (next, Qand_rest)) |
| 2198 | rest = 1; |
| 2199 | else if (EQ (next, Qand_optional)) |
| 2200 | optional = 1; |
| 2201 | else if (rest) |
| 2202 | { |
| 2203 | specbind (next, Flist (nargs - i, &arg_vector[i])); |
| 2204 | i = nargs; |
| 2205 | } |
| 2206 | else if (i < nargs) |
| 2207 | { |
| 2208 | tem = arg_vector[i++]; |
| 2209 | specbind (next, tem); |
| 2210 | } |
| 2211 | else if (!optional) |
| 2212 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil))); |
| 2213 | else |
| 2214 | specbind (next, Qnil); |
| 2215 | } |
| 2216 | |
| 2217 | if (i < nargs) |
| 2218 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil))); |
| 2219 | |
| 2220 | if (XTYPE (fun) == Lisp_Cons) |
| 2221 | val = Fprogn (Fcdr (Fcdr (fun))); |
| 2222 | else |
| 2223 | val = Fbyte_code (XVECTOR (fun)->contents[COMPILED_BYTECODE], |
| 2224 | XVECTOR (fun)->contents[COMPILED_CONSTANTS], |
| 2225 | XVECTOR (fun)->contents[COMPILED_STACK_DEPTH]); |
| 2226 | return unbind_to (count, val); |
| 2227 | } |
| 2228 | \f |
| 2229 | void |
| 2230 | grow_specpdl () |
| 2231 | { |
| 2232 | register int count = specpdl_ptr - specpdl; |
| 2233 | if (specpdl_size >= max_specpdl_size) |
| 2234 | { |
| 2235 | if (max_specpdl_size < 400) |
| 2236 | max_specpdl_size = 400; |
| 2237 | if (specpdl_size >= max_specpdl_size) |
| 2238 | { |
| 2239 | if (!NILP (Vdebug_on_error)) |
| 2240 | /* Leave room for some specpdl in the debugger. */ |
| 2241 | max_specpdl_size = specpdl_size + 100; |
| 2242 | Fsignal (Qerror, |
| 2243 | Fcons (build_string ("Variable binding depth exceeds max-specpdl-size"), Qnil)); |
| 2244 | } |
| 2245 | } |
| 2246 | specpdl_size *= 2; |
| 2247 | if (specpdl_size > max_specpdl_size) |
| 2248 | specpdl_size = max_specpdl_size; |
| 2249 | specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof (struct specbinding)); |
| 2250 | specpdl_ptr = specpdl + count; |
| 2251 | } |
| 2252 | |
| 2253 | void |
| 2254 | specbind (symbol, value) |
| 2255 | Lisp_Object symbol, value; |
| 2256 | { |
| 2257 | extern void store_symval_forwarding (); /* in eval.c */ |
| 2258 | Lisp_Object ovalue; |
| 2259 | |
| 2260 | CHECK_SYMBOL (symbol, 0); |
| 2261 | |
| 2262 | if (specpdl_ptr == specpdl + specpdl_size) |
| 2263 | grow_specpdl (); |
| 2264 | specpdl_ptr->symbol = symbol; |
| 2265 | specpdl_ptr->func = 0; |
| 2266 | specpdl_ptr->old_value = ovalue = find_symbol_value (symbol); |
| 2267 | specpdl_ptr++; |
| 2268 | if (XTYPE (ovalue) == Lisp_Buffer_Objfwd) |
| 2269 | store_symval_forwarding (symbol, ovalue, value); |
| 2270 | else |
| 2271 | Fset (symbol, value); |
| 2272 | } |
| 2273 | |
| 2274 | void |
| 2275 | record_unwind_protect (function, arg) |
| 2276 | Lisp_Object (*function)(); |
| 2277 | Lisp_Object arg; |
| 2278 | { |
| 2279 | if (specpdl_ptr == specpdl + specpdl_size) |
| 2280 | grow_specpdl (); |
| 2281 | specpdl_ptr->func = function; |
| 2282 | specpdl_ptr->symbol = Qnil; |
| 2283 | specpdl_ptr->old_value = arg; |
| 2284 | specpdl_ptr++; |
| 2285 | } |
| 2286 | |
| 2287 | Lisp_Object |
| 2288 | unbind_to (count, value) |
| 2289 | int count; |
| 2290 | Lisp_Object value; |
| 2291 | { |
| 2292 | int quitf = !NILP (Vquit_flag); |
| 2293 | struct gcpro gcpro1; |
| 2294 | |
| 2295 | GCPRO1 (value); |
| 2296 | |
| 2297 | Vquit_flag = Qnil; |
| 2298 | |
| 2299 | while (specpdl_ptr != specpdl + count) |
| 2300 | { |
| 2301 | --specpdl_ptr; |
| 2302 | if (specpdl_ptr->func != 0) |
| 2303 | (*specpdl_ptr->func) (specpdl_ptr->old_value); |
| 2304 | /* Note that a "binding" of nil is really an unwind protect, |
| 2305 | so in that case the "old value" is a list of forms to evaluate. */ |
| 2306 | else if (NILP (specpdl_ptr->symbol)) |
| 2307 | Fprogn (specpdl_ptr->old_value); |
| 2308 | else |
| 2309 | Fset (specpdl_ptr->symbol, specpdl_ptr->old_value); |
| 2310 | } |
| 2311 | if (NILP (Vquit_flag) && quitf) Vquit_flag = Qt; |
| 2312 | |
| 2313 | UNGCPRO; |
| 2314 | |
| 2315 | return value; |
| 2316 | } |
| 2317 | \f |
| 2318 | #if 0 |
| 2319 | |
| 2320 | /* Get the value of symbol's global binding, even if that binding |
| 2321 | is not now dynamically visible. */ |
| 2322 | |
| 2323 | Lisp_Object |
| 2324 | top_level_value (symbol) |
| 2325 | Lisp_Object symbol; |
| 2326 | { |
| 2327 | register struct specbinding *ptr = specpdl; |
| 2328 | |
| 2329 | CHECK_SYMBOL (symbol, 0); |
| 2330 | for (; ptr != specpdl_ptr; ptr++) |
| 2331 | { |
| 2332 | if (EQ (ptr->symbol, symbol)) |
| 2333 | return ptr->old_value; |
| 2334 | } |
| 2335 | return Fsymbol_value (symbol); |
| 2336 | } |
| 2337 | |
| 2338 | Lisp_Object |
| 2339 | top_level_set (symbol, newval) |
| 2340 | Lisp_Object symbol, newval; |
| 2341 | { |
| 2342 | register struct specbinding *ptr = specpdl; |
| 2343 | |
| 2344 | CHECK_SYMBOL (symbol, 0); |
| 2345 | for (; ptr != specpdl_ptr; ptr++) |
| 2346 | { |
| 2347 | if (EQ (ptr->symbol, symbol)) |
| 2348 | { |
| 2349 | ptr->old_value = newval; |
| 2350 | return newval; |
| 2351 | } |
| 2352 | } |
| 2353 | return Fset (symbol, newval); |
| 2354 | } |
| 2355 | |
| 2356 | #endif /* 0 */ |
| 2357 | \f |
| 2358 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, |
| 2359 | "Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG.\n\ |
| 2360 | The debugger is entered when that frame exits, if the flag is non-nil.") |
| 2361 | (level, flag) |
| 2362 | Lisp_Object level, flag; |
| 2363 | { |
| 2364 | register struct backtrace *backlist = backtrace_list; |
| 2365 | register int i; |
| 2366 | |
| 2367 | CHECK_NUMBER (level, 0); |
| 2368 | |
| 2369 | for (i = 0; backlist && i < XINT (level); i++) |
| 2370 | { |
| 2371 | backlist = backlist->next; |
| 2372 | } |
| 2373 | |
| 2374 | if (backlist) |
| 2375 | backlist->debug_on_exit = !NILP (flag); |
| 2376 | |
| 2377 | return flag; |
| 2378 | } |
| 2379 | |
| 2380 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", |
| 2381 | "Print a trace of Lisp function calls currently active.\n\ |
| 2382 | Output stream used is value of `standard-output'.") |
| 2383 | () |
| 2384 | { |
| 2385 | register struct backtrace *backlist = backtrace_list; |
| 2386 | register int i; |
| 2387 | Lisp_Object tail; |
| 2388 | Lisp_Object tem; |
| 2389 | extern Lisp_Object Vprint_level; |
| 2390 | struct gcpro gcpro1; |
| 2391 | |
| 2392 | XFASTINT (Vprint_level) = 3; |
| 2393 | |
| 2394 | tail = Qnil; |
| 2395 | GCPRO1 (tail); |
| 2396 | |
| 2397 | while (backlist) |
| 2398 | { |
| 2399 | write_string (backlist->debug_on_exit ? "* " : " ", 2); |
| 2400 | if (backlist->nargs == UNEVALLED) |
| 2401 | { |
| 2402 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); |
| 2403 | } |
| 2404 | else |
| 2405 | { |
| 2406 | tem = *backlist->function; |
| 2407 | Fprin1 (tem, Qnil); /* This can QUIT */ |
| 2408 | write_string ("(", -1); |
| 2409 | if (backlist->nargs == MANY) |
| 2410 | { |
| 2411 | for (tail = *backlist->args, i = 0; |
| 2412 | !NILP (tail); |
| 2413 | tail = Fcdr (tail), i++) |
| 2414 | { |
| 2415 | if (i) write_string (" ", -1); |
| 2416 | Fprin1 (Fcar (tail), Qnil); |
| 2417 | } |
| 2418 | } |
| 2419 | else |
| 2420 | { |
| 2421 | for (i = 0; i < backlist->nargs; i++) |
| 2422 | { |
| 2423 | if (i) write_string (" ", -1); |
| 2424 | Fprin1 (backlist->args[i], Qnil); |
| 2425 | } |
| 2426 | } |
| 2427 | } |
| 2428 | write_string (")\n", -1); |
| 2429 | backlist = backlist->next; |
| 2430 | } |
| 2431 | |
| 2432 | Vprint_level = Qnil; |
| 2433 | UNGCPRO; |
| 2434 | return Qnil; |
| 2435 | } |
| 2436 | |
| 2437 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, "", |
| 2438 | "Return the function and arguments N frames up from current execution point.\n\ |
| 2439 | If that frame has not evaluated the arguments yet (or is a special form),\n\ |
| 2440 | the value is (nil FUNCTION ARG-FORMS...).\n\ |
| 2441 | If that frame has evaluated its arguments and called its function already,\n\ |
| 2442 | the value is (t FUNCTION ARG-VALUES...).\n\ |
| 2443 | A &rest arg is represented as the tail of the list ARG-VALUES.\n\ |
| 2444 | FUNCTION is whatever was supplied as car of evaluated list,\n\ |
| 2445 | or a lambda expression for macro calls.\n\ |
| 2446 | If N is more than the number of frames, the value is nil.") |
| 2447 | (nframes) |
| 2448 | Lisp_Object nframes; |
| 2449 | { |
| 2450 | register struct backtrace *backlist = backtrace_list; |
| 2451 | register int i; |
| 2452 | Lisp_Object tem; |
| 2453 | |
| 2454 | CHECK_NATNUM (nframes, 0); |
| 2455 | |
| 2456 | /* Find the frame requested. */ |
| 2457 | for (i = 0; i < XFASTINT (nframes); i++) |
| 2458 | backlist = backlist->next; |
| 2459 | |
| 2460 | if (!backlist) |
| 2461 | return Qnil; |
| 2462 | if (backlist->nargs == UNEVALLED) |
| 2463 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); |
| 2464 | else |
| 2465 | { |
| 2466 | if (backlist->nargs == MANY) |
| 2467 | tem = *backlist->args; |
| 2468 | else |
| 2469 | tem = Flist (backlist->nargs, backlist->args); |
| 2470 | |
| 2471 | return Fcons (Qt, Fcons (*backlist->function, tem)); |
| 2472 | } |
| 2473 | } |
| 2474 | \f |
| 2475 | syms_of_eval () |
| 2476 | { |
| 2477 | DEFVAR_INT ("max-specpdl-size", &max_specpdl_size, |
| 2478 | "Limit on number of Lisp variable bindings & unwind-protects before error."); |
| 2479 | |
| 2480 | DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth, |
| 2481 | "Limit on depth in `eval', `apply' and `funcall' before error.\n\ |
| 2482 | This limit is to catch infinite recursions for you before they cause\n\ |
| 2483 | actual stack overflow in C, which would be fatal for Emacs.\n\ |
| 2484 | You can safely make it considerably larger than its default value,\n\ |
| 2485 | if that proves inconveniently small."); |
| 2486 | |
| 2487 | DEFVAR_LISP ("quit-flag", &Vquit_flag, |
| 2488 | "Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil.\n\ |
| 2489 | Typing C-G sets `quit-flag' non-nil, regardless of `inhibit-quit'."); |
| 2490 | Vquit_flag = Qnil; |
| 2491 | |
| 2492 | DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit, |
| 2493 | "Non-nil inhibits C-g quitting from happening immediately.\n\ |
| 2494 | Note that `quit-flag' will still be set by typing C-g,\n\ |
| 2495 | so a quit will be signalled as soon as `inhibit-quit' is nil.\n\ |
| 2496 | To prevent this happening, set `quit-flag' to nil\n\ |
| 2497 | before making `inhibit-quit' nil."); |
| 2498 | Vinhibit_quit = Qnil; |
| 2499 | |
| 2500 | Qinhibit_quit = intern ("inhibit-quit"); |
| 2501 | staticpro (&Qinhibit_quit); |
| 2502 | |
| 2503 | Qautoload = intern ("autoload"); |
| 2504 | staticpro (&Qautoload); |
| 2505 | |
| 2506 | Qdebug_on_error = intern ("debug-on-error"); |
| 2507 | staticpro (&Qdebug_on_error); |
| 2508 | |
| 2509 | Qmacro = intern ("macro"); |
| 2510 | staticpro (&Qmacro); |
| 2511 | |
| 2512 | /* Note that the process handling also uses Qexit, but we don't want |
| 2513 | to staticpro it twice, so we just do it here. */ |
| 2514 | Qexit = intern ("exit"); |
| 2515 | staticpro (&Qexit); |
| 2516 | |
| 2517 | Qinteractive = intern ("interactive"); |
| 2518 | staticpro (&Qinteractive); |
| 2519 | |
| 2520 | Qcommandp = intern ("commandp"); |
| 2521 | staticpro (&Qcommandp); |
| 2522 | |
| 2523 | Qdefun = intern ("defun"); |
| 2524 | staticpro (&Qdefun); |
| 2525 | |
| 2526 | Qand_rest = intern ("&rest"); |
| 2527 | staticpro (&Qand_rest); |
| 2528 | |
| 2529 | Qand_optional = intern ("&optional"); |
| 2530 | staticpro (&Qand_optional); |
| 2531 | |
| 2532 | DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error, |
| 2533 | "*Non-nil means automatically display a backtrace buffer\n\ |
| 2534 | after any error that is handled by the editor command loop.\n\ |
| 2535 | If the value is a list, an error only means to display a backtrace\n\ |
| 2536 | if one of its condition symbols appears in the list."); |
| 2537 | Vstack_trace_on_error = Qnil; |
| 2538 | |
| 2539 | DEFVAR_LISP ("debug-on-error", &Vdebug_on_error, |
| 2540 | "*Non-nil means enter debugger if an error is signaled.\n\ |
| 2541 | Does not apply to errors handled by `condition-case'.\n\ |
| 2542 | If the value is a list, an error only means to enter the debugger\n\ |
| 2543 | if one of its condition symbols appears in the list.\n\ |
| 2544 | See also variable `debug-on-quit'."); |
| 2545 | Vdebug_on_error = Qnil; |
| 2546 | |
| 2547 | DEFVAR_BOOL ("debug-on-quit", &debug_on_quit, |
| 2548 | "*Non-nil means enter debugger if quit is signaled (C-G, for example).\n\ |
| 2549 | Does not apply if quit is handled by a `condition-case'."); |
| 2550 | debug_on_quit = 0; |
| 2551 | |
| 2552 | DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call, |
| 2553 | "Non-nil means enter debugger before next `eval', `apply' or `funcall'."); |
| 2554 | |
| 2555 | DEFVAR_LISP ("debugger", &Vdebugger, |
| 2556 | "Function to call to invoke debugger.\n\ |
| 2557 | If due to frame exit, args are `exit' and the value being returned;\n\ |
| 2558 | this function's value will be returned instead of that.\n\ |
| 2559 | If due to error, args are `error' and a list of the args to `signal'.\n\ |
| 2560 | If due to `apply' or `funcall' entry, one arg, `lambda'.\n\ |
| 2561 | If due to `eval' entry, one arg, t."); |
| 2562 | Vdebugger = Qnil; |
| 2563 | |
| 2564 | Qmocklisp_arguments = intern ("mocklisp-arguments"); |
| 2565 | staticpro (&Qmocklisp_arguments); |
| 2566 | DEFVAR_LISP ("mocklisp-arguments", &Vmocklisp_arguments, |
| 2567 | "While in a mocklisp function, the list of its unevaluated args."); |
| 2568 | Vmocklisp_arguments = Qt; |
| 2569 | |
| 2570 | DEFVAR_LISP ("run-hooks", &Vrun_hooks, |
| 2571 | "Set to the function `run-hooks', if that function has been defined.\n\ |
| 2572 | Otherwise, nil (in a bare Emacs without preloaded Lisp code)."); |
| 2573 | Vrun_hooks = Qnil; |
| 2574 | |
| 2575 | staticpro (&Vautoload_queue); |
| 2576 | Vautoload_queue = Qnil; |
| 2577 | |
| 2578 | defsubr (&Sor); |
| 2579 | defsubr (&Sand); |
| 2580 | defsubr (&Sif); |
| 2581 | defsubr (&Scond); |
| 2582 | defsubr (&Sprogn); |
| 2583 | defsubr (&Sprog1); |
| 2584 | defsubr (&Sprog2); |
| 2585 | defsubr (&Ssetq); |
| 2586 | defsubr (&Squote); |
| 2587 | defsubr (&Sfunction); |
| 2588 | defsubr (&Sdefun); |
| 2589 | defsubr (&Sdefmacro); |
| 2590 | defsubr (&Sdefvar); |
| 2591 | defsubr (&Sdefconst); |
| 2592 | defsubr (&Suser_variable_p); |
| 2593 | defsubr (&Slet); |
| 2594 | defsubr (&SletX); |
| 2595 | defsubr (&Swhile); |
| 2596 | defsubr (&Smacroexpand); |
| 2597 | defsubr (&Scatch); |
| 2598 | defsubr (&Sthrow); |
| 2599 | defsubr (&Sunwind_protect); |
| 2600 | defsubr (&Scondition_case); |
| 2601 | defsubr (&Ssignal); |
| 2602 | defsubr (&Sinteractive_p); |
| 2603 | defsubr (&Scommandp); |
| 2604 | defsubr (&Sautoload); |
| 2605 | defsubr (&Seval); |
| 2606 | defsubr (&Sapply); |
| 2607 | defsubr (&Sfuncall); |
| 2608 | defsubr (&Sbacktrace_debug); |
| 2609 | defsubr (&Sbacktrace); |
| 2610 | defsubr (&Sbacktrace_frame); |
| 2611 | } |