Mercurial > vim
annotate src/ex_eval.c @ 18991:847cc7932c42 v8.2.0056
patch 8.2.0056: execution stack is incomplete and inefficient
Commit: https://github.com/vim/vim/commit/1a47ae32cdc19b0fd5a82e19fe5fddf45db1a506
Author: Bram Moolenaar <Bram@vim.org>
Date: Sun Dec 29 23:04:25 2019 +0100
patch 8.2.0056: execution stack is incomplete and inefficient
Problem: Execution stack is incomplete and inefficient.
Solution: Introduce a proper execution stack and use it instead of
sourcing_name/sourcing_lnum. Create a string only when used.
| author | Bram Moolenaar <Bram@vim.org> |
|---|---|
| date | Sun, 29 Dec 2019 23:15:04 +0100 |
| parents | 2bdc2e1f6e1f |
| children | 94eda51ba9ba |
| rev | line source |
|---|---|
|
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1 /* vi:set ts=8 sts=4 sw=4 noet: |
| 7 | 2 * |
| 3 * VIM - Vi IMproved by Bram Moolenaar | |
| 4 * | |
| 5 * Do ":help uganda" in Vim to read copying and usage conditions. | |
| 6 * Do ":help credits" in Vim to see a list of people who contributed. | |
| 7 * See README.txt for an overview of the Vim source code. | |
| 8 */ | |
| 9 | |
| 10 /* | |
| 11 * ex_eval.c: functions for Ex command line for the +eval feature. | |
| 12 */ | |
| 13 | |
| 14 #include "vim.h" | |
| 15 | |
| 16 #if defined(FEAT_EVAL) || defined(PROTO) | |
| 17 | |
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18 static int throw_exception(void *, except_type_T, char_u *); |
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19 static char *get_end_emsg(cstack_T *cstack); |
| 7 | 20 |
| 21 /* | |
| 22 * Exception handling terms: | |
| 23 * | |
| 24 * :try ":try" command \ | |
| 25 * ... try block | | |
| 26 * :catch RE ":catch" command | | |
| 27 * ... catch clause |- try conditional | |
| 28 * :finally ":finally" command | | |
| 29 * ... finally clause | | |
| 30 * :endtry ":endtry" command / | |
| 31 * | |
| 32 * The try conditional may have any number of catch clauses and at most one | |
| 33 * finally clause. A ":throw" command can be inside the try block, a catch | |
| 34 * clause, the finally clause, or in a function called or script sourced from | |
| 35 * there or even outside the try conditional. Try conditionals may be nested. | |
| 36 */ | |
| 37 | |
| 38 /* | |
| 39 * Configuration whether an exception is thrown on error or interrupt. When | |
| 40 * the preprocessor macros below evaluate to FALSE, an error (did_emsg) or | |
| 41 * interrupt (got_int) under an active try conditional terminates the script | |
| 42 * after the non-active finally clauses of all active try conditionals have been | |
| 43 * executed. Otherwise, errors and/or interrupts are converted into catchable | |
| 44 * exceptions (did_throw additionally set), which terminate the script only if | |
| 45 * not caught. For user exceptions, only did_throw is set. (Note: got_int can | |
| 4352 | 46 * be set asynchronously afterwards by a SIGINT, so did_throw && got_int is not |
| 7 | 47 * a reliant test that the exception currently being thrown is an interrupt |
| 48 * exception. Similarly, did_emsg can be set afterwards on an error in an | |
| 49 * (unskipped) conditional command inside an inactive conditional, so did_throw | |
| 50 * && did_emsg is not a reliant test that the exception currently being thrown | |
| 51 * is an error exception.) - The macros can be defined as expressions checking | |
| 52 * for a variable that is allowed to be changed during execution of a script. | |
| 53 */ | |
| 54 #if 0 | |
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55 // Expressions used for testing during the development phase. |
| 7 | 56 # define THROW_ON_ERROR (!eval_to_number("$VIMNOERRTHROW")) |
| 57 # define THROW_ON_INTERRUPT (!eval_to_number("$VIMNOINTTHROW")) | |
| 58 # define THROW_TEST | |
| 59 #else | |
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60 // Values used for the Vim release. |
| 7 | 61 # define THROW_ON_ERROR TRUE |
| 1880 | 62 # define THROW_ON_ERROR_TRUE |
| 7 | 63 # define THROW_ON_INTERRUPT TRUE |
| 1880 | 64 # define THROW_ON_INTERRUPT_TRUE |
| 7 | 65 #endif |
| 66 | |
| 67 /* | |
| 68 * When several errors appear in a row, setting "force_abort" is delayed until | |
| 69 * the failing command returned. "cause_abort" is set to TRUE meanwhile, in | |
| 70 * order to indicate that situation. This is useful when "force_abort" was set | |
| 71 * during execution of a function call from an expression: the aborting of the | |
| 72 * expression evaluation is done without producing any error messages, but all | |
| 73 * error messages on parsing errors during the expression evaluation are given | |
| 74 * (even if a try conditional is active). | |
| 75 */ | |
| 76 static int cause_abort = FALSE; | |
| 77 | |
| 78 /* | |
| 1214 | 79 * Return TRUE when immediately aborting on error, or when an interrupt |
| 7 | 80 * occurred or an exception was thrown but not caught. Use for ":{range}call" |
| 81 * to check whether an aborted function that does not handle a range itself | |
| 82 * should be called again for the next line in the range. Also used for | |
| 83 * cancelling expression evaluation after a function call caused an immediate | |
| 84 * abort. Note that the first emsg() call temporarily resets "force_abort" | |
| 85 * until the throw point for error messages has been reached. That is, during | |
| 86 * cancellation of an expression evaluation after an aborting function call or | |
| 87 * due to a parsing error, aborting() always returns the same value. | |
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88 * "got_int" is also set by calling interrupt(). |
| 7 | 89 */ |
| 90 int | |
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91 aborting(void) |
| 7 | 92 { |
| 93 return (did_emsg && force_abort) || got_int || did_throw; | |
| 94 } | |
| 95 | |
| 96 /* | |
| 97 * The value of "force_abort" is temporarily reset by the first emsg() call | |
| 98 * during an expression evaluation, and "cause_abort" is used instead. It might | |
| 99 * be necessary to restore "force_abort" even before the throw point for the | |
| 100 * error message has been reached. update_force_abort() should be called then. | |
| 101 */ | |
| 102 void | |
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103 update_force_abort(void) |
| 7 | 104 { |
| 105 if (cause_abort) | |
| 106 force_abort = TRUE; | |
| 107 } | |
| 108 | |
| 109 /* | |
| 110 * Return TRUE if a command with a subcommand resulting in "retcode" should | |
| 111 * abort the script processing. Can be used to suppress an autocommand after | |
| 112 * execution of a failing subcommand as long as the error message has not been | |
| 113 * displayed and actually caused the abortion. | |
| 114 */ | |
| 115 int | |
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116 should_abort(int retcode) |
| 7 | 117 { |
| 118 return ((retcode == FAIL && trylevel != 0 && !emsg_silent) || aborting()); | |
| 119 } | |
| 120 | |
| 121 /* | |
| 122 * Return TRUE if a function with the "abort" flag should not be considered | |
| 123 * ended on an error. This means that parsing commands is continued in order | |
| 124 * to find finally clauses to be executed, and that some errors in skipped | |
| 125 * commands are still reported. | |
| 126 */ | |
| 127 int | |
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128 aborted_in_try(void) |
| 7 | 129 { |
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130 // This function is only called after an error. In this case, "force_abort" |
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131 // determines whether searching for finally clauses is necessary. |
| 7 | 132 return force_abort; |
| 133 } | |
| 134 | |
| 135 /* | |
| 136 * cause_errthrow(): Cause a throw of an error exception if appropriate. | |
| 137 * Return TRUE if the error message should not be displayed by emsg(). | |
| 138 * Sets "ignore", if the emsg() call should be ignored completely. | |
| 139 * | |
| 140 * When several messages appear in the same command, the first is usually the | |
| 141 * most specific one and used as the exception value. The "severe" flag can be | |
| 142 * set to TRUE, if a later but severer message should be used instead. | |
| 143 */ | |
| 144 int | |
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145 cause_errthrow( |
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146 char_u *mesg, |
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147 int severe, |
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148 int *ignore) |
| 7 | 149 { |
| 150 struct msglist *elem; | |
| 151 struct msglist **plist; | |
| 152 | |
| 153 /* | |
| 839 | 154 * Do nothing when displaying the interrupt message or reporting an |
| 155 * uncaught exception (which has already been discarded then) at the top | |
| 156 * level. Also when no exception can be thrown. The message will be | |
| 157 * displayed by emsg(). | |
| 7 | 158 */ |
| 159 if (suppress_errthrow) | |
| 160 return FALSE; | |
| 161 | |
| 162 /* | |
| 839 | 163 * If emsg() has not been called previously, temporarily reset |
| 164 * "force_abort" until the throw point for error messages has been | |
| 165 * reached. This ensures that aborting() returns the same value for all | |
| 166 * errors that appear in the same command. This means particularly that | |
| 167 * for parsing errors during expression evaluation emsg() will be called | |
| 168 * multiply, even when the expression is evaluated from a finally clause | |
| 169 * that was activated due to an aborting error, interrupt, or exception. | |
| 7 | 170 */ |
| 171 if (!did_emsg) | |
| 172 { | |
| 173 cause_abort = force_abort; | |
| 174 force_abort = FALSE; | |
| 175 } | |
| 176 | |
| 177 /* | |
| 178 * If no try conditional is active and no exception is being thrown and | |
| 179 * there has not been an error in a try conditional or a throw so far, do | |
| 839 | 180 * nothing (for compatibility of non-EH scripts). The message will then |
| 181 * be displayed by emsg(). When ":silent!" was used and we are not | |
| 182 * currently throwing an exception, do nothing. The message text will | |
| 183 * then be stored to v:errmsg by emsg() without displaying it. | |
| 7 | 184 */ |
| 185 if (((trylevel == 0 && !cause_abort) || emsg_silent) && !did_throw) | |
| 186 return FALSE; | |
| 187 | |
| 188 /* | |
| 189 * Ignore an interrupt message when inside a try conditional or when an | |
| 839 | 190 * exception is being thrown or when an error in a try conditional or |
| 191 * throw has been detected previously. This is important in order that an | |
| 7 | 192 * interrupt exception is catchable by the innermost try conditional and |
| 193 * not replaced by an interrupt message error exception. | |
| 194 */ | |
| 195 if (mesg == (char_u *)_(e_interr)) | |
| 196 { | |
| 197 *ignore = TRUE; | |
| 198 return TRUE; | |
| 199 } | |
| 200 | |
| 201 /* | |
| 202 * Ensure that all commands in nested function calls and sourced files | |
| 203 * are aborted immediately. | |
| 204 */ | |
| 205 cause_abort = TRUE; | |
| 206 | |
| 207 /* | |
| 208 * When an exception is being thrown, some commands (like conditionals) are | |
| 209 * not skipped. Errors in those commands may affect what of the subsequent | |
| 210 * commands are regarded part of catch and finally clauses. Catching the | |
| 211 * exception would then cause execution of commands not intended by the | |
| 212 * user, who wouldn't even get aware of the problem. Therefor, discard the | |
| 213 * exception currently being thrown to prevent it from being caught. Just | |
| 214 * execute finally clauses and terminate. | |
| 215 */ | |
| 216 if (did_throw) | |
| 217 { | |
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218 // When discarding an interrupt exception, reset got_int to prevent the |
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219 // same interrupt being converted to an exception again and discarding |
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220 // the error exception we are about to throw here. |
| 7 | 221 if (current_exception->type == ET_INTERRUPT) |
| 222 got_int = FALSE; | |
| 223 discard_current_exception(); | |
| 224 } | |
| 225 | |
| 226 #ifdef THROW_TEST | |
| 227 if (!THROW_ON_ERROR) | |
| 228 { | |
| 229 /* | |
| 230 * Print error message immediately without searching for a matching | |
| 231 * catch clause; just finally clauses are executed before the script | |
| 232 * is terminated. | |
| 233 */ | |
| 234 return FALSE; | |
| 235 } | |
| 236 else | |
| 237 #endif | |
| 238 { | |
| 239 /* | |
| 240 * Prepare the throw of an error exception, so that everything will | |
| 241 * be aborted (except for executing finally clauses), until the error | |
| 242 * exception is caught; if still uncaught at the top level, the error | |
| 243 * message will be displayed and the script processing terminated | |
| 244 * then. - This function has no access to the conditional stack. | |
| 245 * Thus, the actual throw is made after the failing command has | |
| 246 * returned. - Throw only the first of several errors in a row, except | |
| 247 * a severe error is following. | |
| 248 */ | |
| 249 if (msg_list != NULL) | |
| 250 { | |
| 251 plist = msg_list; | |
| 252 while (*plist != NULL) | |
| 253 plist = &(*plist)->next; | |
| 254 | |
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255 elem = ALLOC_ONE(struct msglist); |
| 7 | 256 if (elem == NULL) |
| 257 { | |
| 258 suppress_errthrow = TRUE; | |
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259 emsg(_(e_outofmem)); |
| 7 | 260 } |
| 261 else | |
| 262 { | |
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263 elem->msg = (char *)vim_strsave(mesg); |
| 7 | 264 if (elem->msg == NULL) |
| 265 { | |
| 266 vim_free(elem); | |
| 267 suppress_errthrow = TRUE; | |
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268 emsg(_(e_outofmem)); |
| 7 | 269 } |
| 270 else | |
| 271 { | |
| 272 elem->next = NULL; | |
| 273 elem->throw_msg = NULL; | |
| 274 *plist = elem; | |
| 275 if (plist == msg_list || severe) | |
| 276 { | |
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277 char *tmsg; |
| 7 | 278 |
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279 // Skip the extra "Vim " prefix for message "E458". |
| 7 | 280 tmsg = elem->msg; |
| 281 if (STRNCMP(tmsg, "Vim E", 5) == 0 | |
| 282 && VIM_ISDIGIT(tmsg[5]) | |
| 283 && VIM_ISDIGIT(tmsg[6]) | |
| 284 && VIM_ISDIGIT(tmsg[7]) | |
| 285 && tmsg[8] == ':' | |
| 286 && tmsg[9] == ' ') | |
| 287 (*msg_list)->throw_msg = &tmsg[4]; | |
| 288 else | |
| 289 (*msg_list)->throw_msg = tmsg; | |
| 290 } | |
| 291 } | |
| 292 } | |
| 293 } | |
| 294 return TRUE; | |
| 295 } | |
| 296 } | |
| 297 | |
| 298 /* | |
| 299 * Free a "msg_list" and the messages it contains. | |
| 300 */ | |
| 301 static void | |
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302 free_msglist(struct msglist *l) |
| 7 | 303 { |
| 304 struct msglist *messages, *next; | |
| 305 | |
| 306 messages = l; | |
| 307 while (messages != NULL) | |
| 308 { | |
| 309 next = messages->next; | |
| 310 vim_free(messages->msg); | |
| 311 vim_free(messages); | |
| 312 messages = next; | |
| 313 } | |
| 314 } | |
| 315 | |
| 316 /* | |
| 5517 | 317 * Free global "*msg_list" and the messages it contains, then set "*msg_list" |
| 318 * to NULL. | |
| 319 */ | |
| 320 void | |
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321 free_global_msglist(void) |
| 5517 | 322 { |
| 323 free_msglist(*msg_list); | |
| 324 *msg_list = NULL; | |
| 325 } | |
| 326 | |
| 327 /* | |
| 7 | 328 * Throw the message specified in the call to cause_errthrow() above as an |
| 329 * error exception. If cstack is NULL, postpone the throw until do_cmdline() | |
| 330 * has returned (see do_one_cmd()). | |
| 331 */ | |
| 332 void | |
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333 do_errthrow(cstack_T *cstack, char_u *cmdname) |
| 7 | 334 { |
| 335 /* | |
| 336 * Ensure that all commands in nested function calls and sourced files | |
| 337 * are aborted immediately. | |
| 338 */ | |
| 339 if (cause_abort) | |
| 340 { | |
| 341 cause_abort = FALSE; | |
| 342 force_abort = TRUE; | |
| 343 } | |
| 344 | |
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345 // If no exception is to be thrown or the conversion should be done after |
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346 // returning to a previous invocation of do_one_cmd(), do nothing. |
| 1046 | 347 if (msg_list == NULL || *msg_list == NULL) |
| 7 | 348 return; |
| 349 | |
| 350 if (throw_exception(*msg_list, ET_ERROR, cmdname) == FAIL) | |
| 351 free_msglist(*msg_list); | |
| 352 else | |
| 353 { | |
| 354 if (cstack != NULL) | |
| 355 do_throw(cstack); | |
| 356 else | |
| 357 need_rethrow = TRUE; | |
| 358 } | |
| 359 *msg_list = NULL; | |
| 360 } | |
| 361 | |
| 362 /* | |
| 363 * do_intthrow(): Replace the current exception by an interrupt or interrupt | |
| 364 * exception if appropriate. Return TRUE if the current exception is discarded, | |
| 365 * FALSE otherwise. | |
| 366 */ | |
| 367 int | |
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368 do_intthrow(cstack_T *cstack) |
| 7 | 369 { |
| 370 /* | |
| 371 * If no interrupt occurred or no try conditional is active and no exception | |
| 372 * is being thrown, do nothing (for compatibility of non-EH scripts). | |
| 373 */ | |
| 374 if (!got_int || (trylevel == 0 && !did_throw)) | |
| 375 return FALSE; | |
| 376 | |
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377 #ifdef THROW_TEST // avoid warning for condition always true |
| 7 | 378 if (!THROW_ON_INTERRUPT) |
| 379 { | |
| 380 /* | |
| 381 * The interrupt aborts everything except for executing finally clauses. | |
| 382 * Discard any user or error or interrupt exception currently being | |
| 383 * thrown. | |
| 384 */ | |
| 385 if (did_throw) | |
| 386 discard_current_exception(); | |
| 387 } | |
| 388 else | |
| 389 #endif | |
| 390 { | |
| 391 /* | |
| 392 * Throw an interrupt exception, so that everything will be aborted | |
| 393 * (except for executing finally clauses), until the interrupt exception | |
| 394 * is caught; if still uncaught at the top level, the script processing | |
| 395 * will be terminated then. - If an interrupt exception is already | |
| 396 * being thrown, do nothing. | |
| 397 * | |
| 398 */ | |
| 399 if (did_throw) | |
| 400 { | |
| 401 if (current_exception->type == ET_INTERRUPT) | |
| 402 return FALSE; | |
| 403 | |
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|
404 // An interrupt exception replaces any user or error exception. |
| 7 | 405 discard_current_exception(); |
| 406 } | |
| 407 if (throw_exception("Vim:Interrupt", ET_INTERRUPT, NULL) != FAIL) | |
| 408 do_throw(cstack); | |
| 409 } | |
| 410 | |
| 411 return TRUE; | |
| 412 } | |
| 413 | |
| 414 /* | |
| 5517 | 415 * Get an exception message that is to be stored in current_exception->value. |
| 7 | 416 */ |
|
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417 char * |
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changeset
|
418 get_exception_string( |
|
f86adafb28d4
commit https://github.com/vim/vim/commit/78c0b7d43e5048fd71d12816659667834170c76d
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|
419 void *value, |
|
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commit https://github.com/vim/vim/commit/8a5883b7488e492419dde7e1637cc72f2d566ba4
Christian Brabandt <cb@256bit.org>
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diff
changeset
|
420 except_type_T type, |
|
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commit https://github.com/vim/vim/commit/78c0b7d43e5048fd71d12816659667834170c76d
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changeset
|
421 char_u *cmdname, |
|
f86adafb28d4
commit https://github.com/vim/vim/commit/78c0b7d43e5048fd71d12816659667834170c76d
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|
422 int *should_free) |
| 7 | 423 { |
|
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424 char *ret; |
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|
425 char *mesg; |
| 7 | 426 int cmdlen; |
|
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|
427 char *p, *val; |
| 7 | 428 |
| 429 if (type == ET_ERROR) | |
| 430 { | |
|
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commit https://github.com/vim/vim/commit/9ef00be261115acb5bae3b3ca45c1d86a19ba2c7
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|
431 *should_free = TRUE; |
| 5517 | 432 mesg = ((struct msglist *)value)->throw_msg; |
| 7 | 433 if (cmdname != NULL && *cmdname != NUL) |
| 434 { | |
| 835 | 435 cmdlen = (int)STRLEN(cmdname); |
|
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|
436 ret = (char *)vim_strnsave((char_u *)"Vim(", |
| 7 | 437 4 + cmdlen + 2 + (int)STRLEN(mesg)); |
| 5517 | 438 if (ret == NULL) |
| 439 return ret; | |
| 440 STRCPY(&ret[4], cmdname); | |
| 441 STRCPY(&ret[4 + cmdlen], "):"); | |
| 442 val = ret + 4 + cmdlen + 2; | |
| 7 | 443 } |
| 444 else | |
| 445 { | |
|
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446 ret = (char *)vim_strnsave((char_u *)"Vim:", 4 + (int)STRLEN(mesg)); |
| 5517 | 447 if (ret == NULL) |
| 448 return ret; | |
| 449 val = ret + 4; | |
| 7 | 450 } |
| 451 | |
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452 // msg_add_fname may have been used to prefix the message with a file |
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453 // name in quotes. In the exception value, put the file name in |
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454 // parentheses and move it to the end. |
| 7 | 455 for (p = mesg; ; p++) |
| 456 { | |
| 457 if (*p == NUL | |
| 458 || (*p == 'E' | |
| 459 && VIM_ISDIGIT(p[1]) | |
| 460 && (p[2] == ':' | |
| 461 || (VIM_ISDIGIT(p[2]) | |
| 462 && (p[3] == ':' | |
| 463 || (VIM_ISDIGIT(p[3]) | |
| 464 && p[4] == ':')))))) | |
| 465 { | |
| 273 | 466 if (*p == NUL || p == mesg) |
|
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467 STRCAT(val, mesg); // 'E123' missing or at beginning |
| 7 | 468 else |
| 469 { | |
|
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470 // '"filename" E123: message text' |
| 7 | 471 if (mesg[0] != '"' || p-2 < &mesg[1] || |
| 472 p[-2] != '"' || p[-1] != ' ') | |
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473 // "E123:" is part of the file name. |
| 7 | 474 continue; |
| 475 | |
| 476 STRCAT(val, p); | |
| 477 p[-2] = NUL; | |
| 478 sprintf((char *)(val + STRLEN(p)), " (%s)", &mesg[1]); | |
| 479 p[-2] = '"'; | |
| 480 } | |
| 481 break; | |
| 482 } | |
| 483 } | |
| 484 } | |
| 485 else | |
| 5517 | 486 { |
| 487 *should_free = FALSE; | |
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488 ret = value; |
| 5517 | 489 } |
| 490 | |
| 491 return ret; | |
| 492 } | |
| 493 | |
| 494 | |
| 495 /* | |
| 496 * Throw a new exception. Return FAIL when out of memory or it was tried to | |
| 497 * throw an illegal user exception. "value" is the exception string for a | |
| 498 * user or interrupt exception, or points to a message list in case of an | |
| 499 * error exception. | |
| 500 */ | |
| 501 static int | |
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502 throw_exception(void *value, except_type_T type, char_u *cmdname) |
| 5517 | 503 { |
| 504 except_T *excp; | |
| 505 int should_free; | |
| 506 | |
| 507 /* | |
| 508 * Disallow faking Interrupt or error exceptions as user exceptions. They | |
| 509 * would be treated differently from real interrupt or error exceptions | |
| 510 * when no active try block is found, see do_cmdline(). | |
| 511 */ | |
| 512 if (type == ET_USER) | |
| 513 { | |
| 514 if (STRNCMP((char_u *)value, "Vim", 3) == 0 | |
| 515 && (((char_u *)value)[3] == NUL || ((char_u *)value)[3] == ':' | |
| 516 || ((char_u *)value)[3] == '(')) | |
| 517 { | |
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518 emsg(_("E608: Cannot :throw exceptions with 'Vim' prefix")); |
| 5517 | 519 goto fail; |
| 520 } | |
| 521 } | |
| 522 | |
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523 excp = ALLOC_ONE(except_T); |
| 5517 | 524 if (excp == NULL) |
| 525 goto nomem; | |
| 526 | |
| 527 if (type == ET_ERROR) | |
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528 // Store the original message and prefix the exception value with |
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529 // "Vim:" or, if a command name is given, "Vim(cmdname):". |
| 5517 | 530 excp->messages = (struct msglist *)value; |
| 531 | |
| 532 excp->value = get_exception_string(value, type, cmdname, &should_free); | |
| 533 if (excp->value == NULL && should_free) | |
| 534 goto nomem; | |
| 7 | 535 |
| 536 excp->type = type; | |
|
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patch 8.2.0056: execution stack is incomplete and inefficient
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537 excp->throw_name = estack_sfile(); |
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patch 8.2.0056: execution stack is incomplete and inefficient
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changeset
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538 if (excp->throw_name == NULL) |
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changeset
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539 excp->throw_name = vim_strsave((char_u *)""); |
| 7 | 540 if (excp->throw_name == NULL) |
| 541 { | |
| 5517 | 542 if (should_free) |
| 7 | 543 vim_free(excp->value); |
| 544 goto nomem; | |
| 545 } | |
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changeset
|
546 excp->throw_lnum = SOURCING_LNUM; |
| 7 | 547 |
| 548 if (p_verbose >= 13 || debug_break_level > 0) | |
| 549 { | |
| 550 int save_msg_silent = msg_silent; | |
| 551 | |
| 552 if (debug_break_level > 0) | |
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changeset
|
553 msg_silent = FALSE; // display messages |
| 293 | 554 else |
| 555 verbose_enter(); | |
| 7 | 556 ++no_wait_return; |
| 293 | 557 if (debug_break_level > 0 || *p_vfile == NUL) |
|
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changeset
|
558 msg_scroll = TRUE; // always scroll up, don't overwrite |
| 293 | 559 |
|
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560 smsg(_("Exception thrown: %s"), excp->value); |
|
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changeset
|
561 msg_puts("\n"); // don't overwrite this either |
| 293 | 562 |
| 563 if (debug_break_level > 0 || *p_vfile == NUL) | |
| 564 cmdline_row = msg_row; | |
| 7 | 565 --no_wait_return; |
| 566 if (debug_break_level > 0) | |
| 567 msg_silent = save_msg_silent; | |
| 293 | 568 else |
| 569 verbose_leave(); | |
| 7 | 570 } |
| 571 | |
| 572 current_exception = excp; | |
| 573 return OK; | |
| 574 | |
| 575 nomem: | |
| 576 vim_free(excp); | |
| 577 suppress_errthrow = TRUE; | |
|
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diff
changeset
|
578 emsg(_(e_outofmem)); |
| 7 | 579 fail: |
| 580 current_exception = NULL; | |
| 581 return FAIL; | |
| 582 } | |
| 583 | |
| 584 /* | |
| 585 * Discard an exception. "was_finished" is set when the exception has been | |
| 586 * caught and the catch clause has been ended normally. | |
| 587 */ | |
| 588 static void | |
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diff
changeset
|
589 discard_exception(except_T *excp, int was_finished) |
| 7 | 590 { |
| 591 char_u *saved_IObuff; | |
| 592 | |
| 593 if (excp == NULL) | |
| 594 { | |
|
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Christian Brabandt <cb@256bit.org>
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diff
changeset
|
595 internal_error("discard_exception()"); |
| 7 | 596 return; |
| 597 } | |
| 598 | |
| 599 if (p_verbose >= 13 || debug_break_level > 0) | |
| 600 { | |
| 601 int save_msg_silent = msg_silent; | |
| 602 | |
| 603 saved_IObuff = vim_strsave(IObuff); | |
| 604 if (debug_break_level > 0) | |
|
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diff
changeset
|
605 msg_silent = FALSE; // display messages |
| 293 | 606 else |
| 607 verbose_enter(); | |
| 7 | 608 ++no_wait_return; |
| 293 | 609 if (debug_break_level > 0 || *p_vfile == NUL) |
|
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changeset
|
610 msg_scroll = TRUE; // always scroll up, don't overwrite |
| 273 | 611 smsg(was_finished |
|
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diff
changeset
|
612 ? _("Exception finished: %s") |
|
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diff
changeset
|
613 : _("Exception discarded: %s"), |
| 7 | 614 excp->value); |
|
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changeset
|
615 msg_puts("\n"); // don't overwrite this either |
| 293 | 616 if (debug_break_level > 0 || *p_vfile == NUL) |
| 617 cmdline_row = msg_row; | |
| 7 | 618 --no_wait_return; |
| 619 if (debug_break_level > 0) | |
| 620 msg_silent = save_msg_silent; | |
| 293 | 621 else |
| 622 verbose_leave(); | |
| 7 | 623 STRCPY(IObuff, saved_IObuff); |
| 624 vim_free(saved_IObuff); | |
| 625 } | |
| 626 if (excp->type != ET_INTERRUPT) | |
| 627 vim_free(excp->value); | |
| 628 if (excp->type == ET_ERROR) | |
| 629 free_msglist(excp->messages); | |
| 630 vim_free(excp->throw_name); | |
| 631 vim_free(excp); | |
| 632 } | |
| 633 | |
| 634 /* | |
| 635 * Discard the exception currently being thrown. | |
| 636 */ | |
| 637 void | |
|
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Christian Brabandt <cb@256bit.org>
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diff
changeset
|
638 discard_current_exception(void) |
| 7 | 639 { |
|
11645
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patch 8.0.0705: crash when there is an error in a timer callback
Christian Brabandt <cb@256bit.org>
parents:
10361
diff
changeset
|
640 if (current_exception != NULL) |
|
50f2a4ad1cfa
patch 8.0.0705: crash when there is an error in a timer callback
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diff
changeset
|
641 { |
|
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patch 8.0.0705: crash when there is an error in a timer callback
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diff
changeset
|
642 discard_exception(current_exception, FALSE); |
|
50f2a4ad1cfa
patch 8.0.0705: crash when there is an error in a timer callback
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diff
changeset
|
643 current_exception = NULL; |
|
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patch 8.0.0705: crash when there is an error in a timer callback
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diff
changeset
|
644 } |
| 7 | 645 did_throw = FALSE; |
| 646 need_rethrow = FALSE; | |
| 647 } | |
| 648 | |
| 649 /* | |
| 650 * Put an exception on the caught stack. | |
| 651 */ | |
| 652 static void | |
|
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Christian Brabandt <cb@256bit.org>
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diff
changeset
|
653 catch_exception(except_T *excp) |
| 7 | 654 { |
| 655 excp->caught = caught_stack; | |
| 656 caught_stack = excp; | |
|
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changeset
|
657 set_vim_var_string(VV_EXCEPTION, (char_u *)excp->value, -1); |
| 7 | 658 if (*excp->throw_name != NUL) |
| 659 { | |
| 660 if (excp->throw_lnum != 0) | |
| 273 | 661 vim_snprintf((char *)IObuff, IOSIZE, _("%s, line %ld"), |
| 662 excp->throw_name, (long)excp->throw_lnum); | |
| 7 | 663 else |
| 273 | 664 vim_snprintf((char *)IObuff, IOSIZE, "%s", excp->throw_name); |
| 7 | 665 set_vim_var_string(VV_THROWPOINT, IObuff, -1); |
| 666 } | |
| 667 else | |
|
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diff
changeset
|
668 // throw_name not set on an exception from a command that was typed. |
| 7 | 669 set_vim_var_string(VV_THROWPOINT, NULL, -1); |
| 670 | |
| 671 if (p_verbose >= 13 || debug_break_level > 0) | |
| 672 { | |
| 673 int save_msg_silent = msg_silent; | |
| 674 | |
| 675 if (debug_break_level > 0) | |
|
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changeset
|
676 msg_silent = FALSE; // display messages |
| 293 | 677 else |
| 678 verbose_enter(); | |
| 7 | 679 ++no_wait_return; |
| 293 | 680 if (debug_break_level > 0 || *p_vfile == NUL) |
|
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changeset
|
681 msg_scroll = TRUE; // always scroll up, don't overwrite |
| 293 | 682 |
|
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changeset
|
683 smsg(_("Exception caught: %s"), excp->value); |
|
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changeset
|
684 msg_puts("\n"); // don't overwrite this either |
| 293 | 685 |
| 686 if (debug_break_level > 0 || *p_vfile == NUL) | |
| 687 cmdline_row = msg_row; | |
| 7 | 688 --no_wait_return; |
| 689 if (debug_break_level > 0) | |
| 690 msg_silent = save_msg_silent; | |
| 293 | 691 else |
| 692 verbose_leave(); | |
| 7 | 693 } |
| 694 } | |
| 695 | |
| 696 /* | |
| 697 * Remove an exception from the caught stack. | |
| 698 */ | |
| 699 static void | |
|
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Christian Brabandt <cb@256bit.org>
parents:
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diff
changeset
|
700 finish_exception(except_T *excp) |
| 7 | 701 { |
| 702 if (excp != caught_stack) | |
|
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commit https://github.com/vim/vim/commit/95f096030ed1a8afea028f2ea295d6f6a70f466f
Christian Brabandt <cb@256bit.org>
parents:
10042
diff
changeset
|
703 internal_error("finish_exception()"); |
| 7 | 704 caught_stack = caught_stack->caught; |
| 705 if (caught_stack != NULL) | |
| 706 { | |
|
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changeset
|
707 set_vim_var_string(VV_EXCEPTION, (char_u *)caught_stack->value, -1); |
| 7 | 708 if (*caught_stack->throw_name != NUL) |
| 709 { | |
| 710 if (caught_stack->throw_lnum != 0) | |
| 273 | 711 vim_snprintf((char *)IObuff, IOSIZE, |
| 7 | 712 _("%s, line %ld"), caught_stack->throw_name, |
| 713 (long)caught_stack->throw_lnum); | |
| 714 else | |
| 273 | 715 vim_snprintf((char *)IObuff, IOSIZE, "%s", |
| 716 caught_stack->throw_name); | |
| 7 | 717 set_vim_var_string(VV_THROWPOINT, IObuff, -1); |
| 718 } | |
| 719 else | |
|
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720 // throw_name not set on an exception from a command that was |
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721 // typed. |
| 7 | 722 set_vim_var_string(VV_THROWPOINT, NULL, -1); |
| 723 } | |
| 724 else | |
| 725 { | |
| 726 set_vim_var_string(VV_EXCEPTION, NULL, -1); | |
| 727 set_vim_var_string(VV_THROWPOINT, NULL, -1); | |
| 728 } | |
| 729 | |
|
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730 // Discard the exception, but use the finish message for 'verbose'. |
| 7 | 731 discard_exception(excp, TRUE); |
| 732 } | |
| 733 | |
| 734 /* | |
| 735 * Flags specifying the message displayed by report_pending. | |
| 736 */ | |
| 737 #define RP_MAKE 0 | |
| 738 #define RP_RESUME 1 | |
| 739 #define RP_DISCARD 2 | |
| 740 | |
| 741 /* | |
| 742 * Report information about something pending in a finally clause if required by | |
| 743 * the 'verbose' option or when debugging. "action" tells whether something is | |
| 744 * made pending or something pending is resumed or discarded. "pending" tells | |
| 745 * what is pending. "value" specifies the return value for a pending ":return" | |
| 746 * or the exception value for a pending exception. | |
| 747 */ | |
| 748 static void | |
|
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749 report_pending(int action, int pending, void *value) |
| 7 | 750 { |
|
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751 char *mesg; |
| 7 | 752 char *s; |
| 753 int save_msg_silent; | |
| 754 | |
| 755 | |
| 756 switch (action) | |
| 757 { | |
| 758 case RP_MAKE: | |
|
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759 mesg = _("%s made pending"); |
| 7 | 760 break; |
| 761 case RP_RESUME: | |
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762 mesg = _("%s resumed"); |
| 7 | 763 break; |
|
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764 // case RP_DISCARD: |
| 7 | 765 default: |
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766 mesg = _("%s discarded"); |
| 7 | 767 break; |
| 768 } | |
| 769 | |
| 770 switch (pending) | |
| 771 { | |
| 772 case CSTP_NONE: | |
| 773 return; | |
| 774 | |
| 775 case CSTP_CONTINUE: | |
| 776 s = ":continue"; | |
| 777 break; | |
| 778 case CSTP_BREAK: | |
| 779 s = ":break"; | |
| 780 break; | |
| 781 case CSTP_FINISH: | |
| 782 s = ":finish"; | |
| 783 break; | |
| 784 case CSTP_RETURN: | |
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785 // ":return" command producing value, allocated |
| 7 | 786 s = (char *)get_return_cmd(value); |
| 787 break; | |
| 788 | |
| 789 default: | |
| 790 if (pending & CSTP_THROW) | |
| 791 { | |
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792 vim_snprintf((char *)IObuff, IOSIZE, mesg, _("Exception")); |
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793 mesg = (char *)vim_strnsave(IObuff, (int)STRLEN(IObuff) + 4); |
| 7 | 794 STRCAT(mesg, ": %s"); |
| 795 s = (char *)((except_T *)value)->value; | |
| 796 } | |
| 797 else if ((pending & CSTP_ERROR) && (pending & CSTP_INTERRUPT)) | |
| 798 s = _("Error and interrupt"); | |
| 799 else if (pending & CSTP_ERROR) | |
| 800 s = _("Error"); | |
|
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801 else // if (pending & CSTP_INTERRUPT) |
| 7 | 802 s = _("Interrupt"); |
| 803 } | |
| 804 | |
| 805 save_msg_silent = msg_silent; | |
| 806 if (debug_break_level > 0) | |
|
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807 msg_silent = FALSE; // display messages |
| 7 | 808 ++no_wait_return; |
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809 msg_scroll = TRUE; // always scroll up, don't overwrite |
|
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810 smsg(mesg, s); |
|
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811 msg_puts("\n"); // don't overwrite this either |
| 7 | 812 cmdline_row = msg_row; |
| 813 --no_wait_return; | |
| 814 if (debug_break_level > 0) | |
| 815 msg_silent = save_msg_silent; | |
| 816 | |
| 817 if (pending == CSTP_RETURN) | |
| 818 vim_free(s); | |
| 819 else if (pending & CSTP_THROW) | |
| 820 vim_free(mesg); | |
| 821 } | |
| 822 | |
| 823 /* | |
| 824 * If something is made pending in a finally clause, report it if required by | |
| 825 * the 'verbose' option or when debugging. | |
| 826 */ | |
| 827 void | |
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828 report_make_pending(int pending, void *value) |
| 7 | 829 { |
| 830 if (p_verbose >= 14 || debug_break_level > 0) | |
| 293 | 831 { |
| 832 if (debug_break_level <= 0) | |
| 833 verbose_enter(); | |
| 7 | 834 report_pending(RP_MAKE, pending, value); |
| 293 | 835 if (debug_break_level <= 0) |
| 836 verbose_leave(); | |
| 837 } | |
| 7 | 838 } |
| 839 | |
| 840 /* | |
| 841 * If something pending in a finally clause is resumed at the ":endtry", report | |
| 842 * it if required by the 'verbose' option or when debugging. | |
| 843 */ | |
|
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844 static void |
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845 report_resume_pending(int pending, void *value) |
| 7 | 846 { |
| 847 if (p_verbose >= 14 || debug_break_level > 0) | |
| 293 | 848 { |
| 849 if (debug_break_level <= 0) | |
| 850 verbose_enter(); | |
| 7 | 851 report_pending(RP_RESUME, pending, value); |
| 293 | 852 if (debug_break_level <= 0) |
| 853 verbose_leave(); | |
| 854 } | |
| 7 | 855 } |
| 856 | |
| 857 /* | |
| 858 * If something pending in a finally clause is discarded, report it if required | |
| 859 * by the 'verbose' option or when debugging. | |
| 860 */ | |
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861 static void |
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862 report_discard_pending(int pending, void *value) |
| 7 | 863 { |
| 864 if (p_verbose >= 14 || debug_break_level > 0) | |
| 293 | 865 { |
| 866 if (debug_break_level <= 0) | |
| 867 verbose_enter(); | |
| 7 | 868 report_pending(RP_DISCARD, pending, value); |
| 293 | 869 if (debug_break_level <= 0) |
| 870 verbose_leave(); | |
| 871 } | |
| 7 | 872 } |
| 873 | |
| 874 | |
| 875 /* | |
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876 * ":eval". |
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877 */ |
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878 void |
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879 ex_eval(exarg_T *eap) |
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880 { |
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881 typval_T tv; |
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882 |
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883 if (eval0(eap->arg, &tv, &eap->nextcmd, !eap->skip) == OK) |
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884 clear_tv(&tv); |
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885 } |
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886 |
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887 /* |
| 7 | 888 * ":if". |
| 889 */ | |
| 890 void | |
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891 ex_if(exarg_T *eap) |
| 7 | 892 { |
| 893 int error; | |
| 894 int skip; | |
| 895 int result; | |
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896 cstack_T *cstack = eap->cstack; |
| 7 | 897 |
| 898 if (cstack->cs_idx == CSTACK_LEN - 1) | |
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899 eap->errmsg = N_("E579: :if nesting too deep"); |
| 7 | 900 else |
| 901 { | |
| 902 ++cstack->cs_idx; | |
| 903 cstack->cs_flags[cstack->cs_idx] = 0; | |
| 904 | |
| 905 /* | |
| 906 * Don't do something after an error, interrupt, or throw, or when there | |
| 907 * is a surrounding conditional and it was not active. | |
| 908 */ | |
| 909 skip = did_emsg || got_int || did_throw || (cstack->cs_idx > 0 | |
| 910 && !(cstack->cs_flags[cstack->cs_idx - 1] & CSF_ACTIVE)); | |
| 911 | |
| 912 result = eval_to_bool(eap->arg, &error, &eap->nextcmd, skip); | |
| 913 | |
| 914 if (!skip && !error) | |
| 915 { | |
| 916 if (result) | |
| 917 cstack->cs_flags[cstack->cs_idx] = CSF_ACTIVE | CSF_TRUE; | |
| 918 } | |
| 919 else | |
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920 // set TRUE, so this conditional will never get active |
| 7 | 921 cstack->cs_flags[cstack->cs_idx] = CSF_TRUE; |
| 922 } | |
| 923 } | |
| 924 | |
| 925 /* | |
| 926 * ":endif". | |
| 927 */ | |
| 928 void | |
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929 ex_endif(exarg_T *eap) |
| 7 | 930 { |
| 931 did_endif = TRUE; | |
| 932 if (eap->cstack->cs_idx < 0 | |
| 79 | 933 || (eap->cstack->cs_flags[eap->cstack->cs_idx] |
| 934 & (CSF_WHILE | CSF_FOR | CSF_TRY))) | |
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935 eap->errmsg = N_("E580: :endif without :if"); |
| 7 | 936 else |
| 937 { | |
| 938 /* | |
| 939 * When debugging or a breakpoint was encountered, display the debug | |
| 940 * prompt (if not already done). This shows the user that an ":endif" | |
| 941 * is executed when the ":if" or a previous ":elseif" was not TRUE. | |
| 942 * Handle a ">quit" debug command as if an interrupt had occurred before | |
| 943 * the ":endif". That is, throw an interrupt exception if appropriate. | |
| 944 * Doing this here prevents an exception for a parsing error being | |
| 945 * discarded by throwing the interrupt exception later on. | |
| 946 */ | |
| 359 | 947 if (!(eap->cstack->cs_flags[eap->cstack->cs_idx] & CSF_TRUE) |
| 948 && dbg_check_skipped(eap)) | |
| 7 | 949 (void)do_intthrow(eap->cstack); |
| 950 | |
| 951 --eap->cstack->cs_idx; | |
| 952 } | |
| 953 } | |
| 954 | |
| 955 /* | |
| 956 * ":else" and ":elseif". | |
| 957 */ | |
| 958 void | |
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959 ex_else(exarg_T *eap) |
| 7 | 960 { |
| 961 int error; | |
| 962 int skip; | |
| 963 int result; | |
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964 cstack_T *cstack = eap->cstack; |
| 7 | 965 |
| 966 /* | |
| 967 * Don't do something after an error, interrupt, or throw, or when there is | |
| 968 * a surrounding conditional and it was not active. | |
| 969 */ | |
| 970 skip = did_emsg || got_int || did_throw || (cstack->cs_idx > 0 | |
| 971 && !(cstack->cs_flags[cstack->cs_idx - 1] & CSF_ACTIVE)); | |
| 972 | |
| 973 if (cstack->cs_idx < 0 | |
| 75 | 974 || (cstack->cs_flags[cstack->cs_idx] |
| 975 & (CSF_WHILE | CSF_FOR | CSF_TRY))) | |
| 7 | 976 { |
| 977 if (eap->cmdidx == CMD_else) | |
| 978 { | |
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979 eap->errmsg = N_("E581: :else without :if"); |
| 7 | 980 return; |
| 981 } | |
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982 eap->errmsg = N_("E582: :elseif without :if"); |
| 7 | 983 skip = TRUE; |
| 984 } | |
| 985 else if (cstack->cs_flags[cstack->cs_idx] & CSF_ELSE) | |
| 986 { | |
| 987 if (eap->cmdidx == CMD_else) | |
| 988 { | |
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989 eap->errmsg = N_("E583: multiple :else"); |
| 7 | 990 return; |
| 991 } | |
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992 eap->errmsg = N_("E584: :elseif after :else"); |
| 7 | 993 skip = TRUE; |
| 994 } | |
| 995 | |
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996 // if skipping or the ":if" was TRUE, reset ACTIVE, otherwise set it |
| 7 | 997 if (skip || cstack->cs_flags[cstack->cs_idx] & CSF_TRUE) |
| 998 { | |
| 999 if (eap->errmsg == NULL) | |
| 1000 cstack->cs_flags[cstack->cs_idx] = CSF_TRUE; | |
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1001 skip = TRUE; // don't evaluate an ":elseif" |
| 7 | 1002 } |
| 1003 else | |
| 1004 cstack->cs_flags[cstack->cs_idx] = CSF_ACTIVE; | |
| 1005 | |
| 1006 /* | |
| 1007 * When debugging or a breakpoint was encountered, display the debug prompt | |
| 1008 * (if not already done). This shows the user that an ":else" or ":elseif" | |
| 1009 * is executed when the ":if" or previous ":elseif" was not TRUE. Handle | |
| 1010 * a ">quit" debug command as if an interrupt had occurred before the | |
| 1011 * ":else" or ":elseif". That is, set "skip" and throw an interrupt | |
| 1012 * exception if appropriate. Doing this here prevents that an exception | |
| 1013 * for a parsing errors is discarded when throwing the interrupt exception | |
| 1014 * later on. | |
| 1015 */ | |
| 1016 if (!skip && dbg_check_skipped(eap) && got_int) | |
| 1017 { | |
| 1018 (void)do_intthrow(cstack); | |
| 1019 skip = TRUE; | |
| 1020 } | |
| 1021 | |
| 1022 if (eap->cmdidx == CMD_elseif) | |
| 1023 { | |
| 1024 result = eval_to_bool(eap->arg, &error, &eap->nextcmd, skip); | |
|
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1025 // When throwing error exceptions, we want to throw always the first |
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1026 // of several errors in a row. This is what actually happens when |
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1027 // a conditional error was detected above and there is another failure |
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1028 // when parsing the expression. Since the skip flag is set in this |
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1029 // case, the parsing error will be ignored by emsg(). |
| 7 | 1030 |
| 1031 if (!skip && !error) | |
| 1032 { | |
| 1033 if (result) | |
| 1034 cstack->cs_flags[cstack->cs_idx] = CSF_ACTIVE | CSF_TRUE; | |
| 1035 else | |
| 1036 cstack->cs_flags[cstack->cs_idx] = 0; | |
| 1037 } | |
| 1038 else if (eap->errmsg == NULL) | |
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1039 // set TRUE, so this conditional will never get active |
| 7 | 1040 cstack->cs_flags[cstack->cs_idx] = CSF_TRUE; |
| 1041 } | |
| 1042 else | |
| 1043 cstack->cs_flags[cstack->cs_idx] |= CSF_ELSE; | |
| 1044 } | |
| 1045 | |
| 1046 /* | |
| 75 | 1047 * Handle ":while" and ":for". |
| 7 | 1048 */ |
| 1049 void | |
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1050 ex_while(exarg_T *eap) |
| 7 | 1051 { |
| 1052 int error; | |
| 1053 int skip; | |
| 1054 int result; | |
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1055 cstack_T *cstack = eap->cstack; |
| 7 | 1056 |
| 1057 if (cstack->cs_idx == CSTACK_LEN - 1) | |
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1058 eap->errmsg = N_("E585: :while/:for nesting too deep"); |
| 7 | 1059 else |
| 1060 { | |
| 1061 /* | |
| 75 | 1062 * The loop flag is set when we have jumped back from the matching |
| 1063 * ":endwhile" or ":endfor". When not set, need to initialise this | |
| 1064 * cstack entry. | |
| 7 | 1065 */ |
| 75 | 1066 if ((cstack->cs_lflags & CSL_HAD_LOOP) == 0) |
| 7 | 1067 { |
| 1068 ++cstack->cs_idx; | |
| 75 | 1069 ++cstack->cs_looplevel; |
| 7 | 1070 cstack->cs_line[cstack->cs_idx] = -1; |
| 1071 } | |
| 75 | 1072 cstack->cs_flags[cstack->cs_idx] = |
| 1073 eap->cmdidx == CMD_while ? CSF_WHILE : CSF_FOR; | |
| 7 | 1074 |
| 1075 /* | |
| 75 | 1076 * Don't do something after an error, interrupt, or throw, or when |
| 1077 * there is a surrounding conditional and it was not active. | |
| 7 | 1078 */ |
| 1079 skip = did_emsg || got_int || did_throw || (cstack->cs_idx > 0 | |
| 1080 && !(cstack->cs_flags[cstack->cs_idx - 1] & CSF_ACTIVE)); | |
| 75 | 1081 if (eap->cmdidx == CMD_while) |
| 1082 { | |
| 1083 /* | |
| 1084 * ":while bool-expr" | |
| 1085 */ | |
| 1086 result = eval_to_bool(eap->arg, &error, &eap->nextcmd, skip); | |
| 1087 } | |
| 1088 else | |
| 1089 { | |
| 1090 void *fi; | |
| 1091 | |
| 1092 /* | |
| 1093 * ":for var in list-expr" | |
| 1094 */ | |
| 1095 if ((cstack->cs_lflags & CSL_HAD_LOOP) != 0) | |
| 1096 { | |
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1097 // Jumping here from a ":continue" or ":endfor": use the |
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1098 // previously evaluated list. |
| 79 | 1099 fi = cstack->cs_forinfo[cstack->cs_idx]; |
| 75 | 1100 error = FALSE; |
| 1101 } | |
| 1102 else | |
| 1103 { | |
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1104 // Evaluate the argument and get the info in a structure. |
| 75 | 1105 fi = eval_for_line(eap->arg, &error, &eap->nextcmd, skip); |
| 79 | 1106 cstack->cs_forinfo[cstack->cs_idx] = fi; |
| 75 | 1107 } |
| 1108 | |
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1109 // use the element at the start of the list and advance |
| 75 | 1110 if (!error && fi != NULL && !skip) |
| 1111 result = next_for_item(fi, eap->arg); | |
| 1112 else | |
| 1113 result = FALSE; | |
| 1114 | |
| 1115 if (!result) | |
| 1116 { | |
| 1117 free_for_info(fi); | |
| 79 | 1118 cstack->cs_forinfo[cstack->cs_idx] = NULL; |
| 75 | 1119 } |
| 1120 } | |
| 7 | 1121 |
| 1122 /* | |
| 75 | 1123 * If this cstack entry was just initialised and is active, set the |
| 1124 * loop flag, so do_cmdline() will set the line number in cs_line[]. | |
| 1125 * If executing the command a second time, clear the loop flag. | |
| 7 | 1126 */ |
| 1127 if (!skip && !error && result) | |
| 1128 { | |
| 75 | 1129 cstack->cs_flags[cstack->cs_idx] |= (CSF_ACTIVE | CSF_TRUE); |
| 1130 cstack->cs_lflags ^= CSL_HAD_LOOP; | |
| 7 | 1131 } |
| 1132 else | |
| 1133 { | |
| 75 | 1134 cstack->cs_lflags &= ~CSL_HAD_LOOP; |
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1135 // If the ":while" evaluates to FALSE or ":for" is past the end of |
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1136 // the list, show the debug prompt at the ":endwhile"/":endfor" as |
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1137 // if there was a ":break" in a ":while"/":for" evaluating to |
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1138 // TRUE. |
| 7 | 1139 if (!skip && !error) |
| 1140 cstack->cs_flags[cstack->cs_idx] |= CSF_TRUE; | |
| 1141 } | |
| 1142 } | |
| 1143 } | |
| 1144 | |
| 1145 /* | |
| 1146 * ":continue" | |
| 1147 */ | |
| 1148 void | |
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1149 ex_continue(exarg_T *eap) |
| 7 | 1150 { |
| 1151 int idx; | |
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1152 cstack_T *cstack = eap->cstack; |
| 7 | 1153 |
| 75 | 1154 if (cstack->cs_looplevel <= 0 || cstack->cs_idx < 0) |
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1155 eap->errmsg = N_("E586: :continue without :while or :for"); |
| 7 | 1156 else |
| 1157 { | |
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1158 // Try to find the matching ":while". This might stop at a try |
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1159 // conditional not in its finally clause (which is then to be executed |
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1160 // next). Therefor, inactivate all conditionals except the ":while" |
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1161 // itself (if reached). |
| 75 | 1162 idx = cleanup_conditionals(cstack, CSF_WHILE | CSF_FOR, FALSE); |
| 840 | 1163 if (idx >= 0 && (cstack->cs_flags[idx] & (CSF_WHILE | CSF_FOR))) |
| 7 | 1164 { |
| 79 | 1165 rewind_conditionals(cstack, idx, CSF_TRY, &cstack->cs_trylevel); |
| 7 | 1166 |
| 1167 /* | |
| 75 | 1168 * Set CSL_HAD_CONT, so do_cmdline() will jump back to the |
| 7 | 1169 * matching ":while". |
| 1170 */ | |
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1171 cstack->cs_lflags |= CSL_HAD_CONT; // let do_cmdline() handle it |
| 7 | 1172 } |
| 1173 else | |
| 1174 { | |
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1175 // If a try conditional not in its finally clause is reached first, |
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1176 // make the ":continue" pending for execution at the ":endtry". |
| 7 | 1177 cstack->cs_pending[idx] = CSTP_CONTINUE; |
| 1178 report_make_pending(CSTP_CONTINUE, NULL); | |
| 1179 } | |
| 1180 } | |
| 1181 } | |
| 1182 | |
| 1183 /* | |
| 1184 * ":break" | |
| 1185 */ | |
| 1186 void | |
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1187 ex_break(exarg_T *eap) |
| 7 | 1188 { |
| 1189 int idx; | |
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1190 cstack_T *cstack = eap->cstack; |
| 7 | 1191 |
| 75 | 1192 if (cstack->cs_looplevel <= 0 || cstack->cs_idx < 0) |
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1193 eap->errmsg = N_("E587: :break without :while or :for"); |
| 7 | 1194 else |
| 1195 { | |
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1196 // Inactivate conditionals until the matching ":while" or a try |
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1197 // conditional not in its finally clause (which is then to be |
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1198 // executed next) is found. In the latter case, make the ":break" |
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1199 // pending for execution at the ":endtry". |
| 75 | 1200 idx = cleanup_conditionals(cstack, CSF_WHILE | CSF_FOR, TRUE); |
| 840 | 1201 if (idx >= 0 && !(cstack->cs_flags[idx] & (CSF_WHILE | CSF_FOR))) |
| 7 | 1202 { |
| 1203 cstack->cs_pending[idx] = CSTP_BREAK; | |
| 1204 report_make_pending(CSTP_BREAK, NULL); | |
| 1205 } | |
| 1206 } | |
| 1207 } | |
| 1208 | |
| 1209 /* | |
| 75 | 1210 * ":endwhile" and ":endfor" |
| 7 | 1211 */ |
| 1212 void | |
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1213 ex_endwhile(exarg_T *eap) |
| 7 | 1214 { |
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1215 cstack_T *cstack = eap->cstack; |
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1216 int idx; |
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1217 char *err; |
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1218 int csf; |
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1219 int fl; |
| 7 | 1220 |
| 75 | 1221 if (eap->cmdidx == CMD_endwhile) |
| 1222 { | |
| 1223 err = e_while; | |
| 1224 csf = CSF_WHILE; | |
| 1225 } | |
| 1226 else | |
| 1227 { | |
| 1228 err = e_for; | |
| 1229 csf = CSF_FOR; | |
| 1230 } | |
| 1231 | |
| 1232 if (cstack->cs_looplevel <= 0 || cstack->cs_idx < 0) | |
| 1233 eap->errmsg = err; | |
| 7 | 1234 else |
| 1235 { | |
| 75 | 1236 fl = cstack->cs_flags[cstack->cs_idx]; |
| 1237 if (!(fl & csf)) | |
| 7 | 1238 { |
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1239 // If we are in a ":while" or ":for" but used the wrong endloop |
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1240 // command, do not rewind to the next enclosing ":for"/":while". |
| 75 | 1241 if (fl & CSF_WHILE) |
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1242 eap->errmsg = _("E732: Using :endfor with :while"); |
| 75 | 1243 else if (fl & CSF_FOR) |
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1244 eap->errmsg = _("E733: Using :endwhile with :for"); |
| 114 | 1245 } |
| 1246 if (!(fl & (CSF_WHILE | CSF_FOR))) | |
| 1247 { | |
| 1248 if (!(fl & CSF_TRY)) | |
| 75 | 1249 eap->errmsg = e_endif; |
| 1250 else if (fl & CSF_FINALLY) | |
| 1251 eap->errmsg = e_endtry; | |
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1252 // Try to find the matching ":while" and report what's missing. |
| 7 | 1253 for (idx = cstack->cs_idx; idx > 0; --idx) |
| 1254 { | |
| 75 | 1255 fl = cstack->cs_flags[idx]; |
| 1256 if ((fl & CSF_TRY) && !(fl & CSF_FINALLY)) | |
| 7 | 1257 { |
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1258 // Give up at a try conditional not in its finally clause. |
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1259 // Ignore the ":endwhile"/":endfor". |
| 75 | 1260 eap->errmsg = err; |
| 7 | 1261 return; |
| 1262 } | |
| 75 | 1263 if (fl & csf) |
| 7 | 1264 break; |
| 1265 } | |
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1266 // Cleanup and rewind all contained (and unclosed) conditionals. |
| 75 | 1267 (void)cleanup_conditionals(cstack, CSF_WHILE | CSF_FOR, FALSE); |
| 7 | 1268 rewind_conditionals(cstack, idx, CSF_TRY, &cstack->cs_trylevel); |
| 1269 } | |
| 1270 | |
| 1271 /* | |
| 1272 * When debugging or a breakpoint was encountered, display the debug | |
| 1273 * prompt (if not already done). This shows the user that an | |
| 75 | 1274 * ":endwhile"/":endfor" is executed when the ":while" was not TRUE or |
| 1275 * after a ":break". Handle a ">quit" debug command as if an | |
| 1276 * interrupt had occurred before the ":endwhile"/":endfor". That is, | |
| 1277 * throw an interrupt exception if appropriate. Doing this here | |
| 1278 * prevents that an exception for a parsing error is discarded when | |
| 1279 * throwing the interrupt exception later on. | |
| 7 | 1280 */ |
| 1281 else if (cstack->cs_flags[cstack->cs_idx] & CSF_TRUE | |
| 1282 && !(cstack->cs_flags[cstack->cs_idx] & CSF_ACTIVE) | |
| 1283 && dbg_check_skipped(eap)) | |
| 1284 (void)do_intthrow(cstack); | |
| 1285 | |
| 1286 /* | |
| 75 | 1287 * Set loop flag, so do_cmdline() will jump back to the matching |
| 1288 * ":while" or ":for". | |
| 7 | 1289 */ |
| 75 | 1290 cstack->cs_lflags |= CSL_HAD_ENDLOOP; |
| 7 | 1291 } |
| 1292 } | |
| 1293 | |
| 1294 | |
| 1295 /* | |
| 1296 * ":throw expr" | |
| 1297 */ | |
| 1298 void | |
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1299 ex_throw(exarg_T *eap) |
| 7 | 1300 { |
| 1301 char_u *arg = eap->arg; | |
| 1302 char_u *value; | |
| 1303 | |
| 1304 if (*arg != NUL && *arg != '|' && *arg != '\n') | |
| 1305 value = eval_to_string_skip(arg, &eap->nextcmd, eap->skip); | |
| 1306 else | |
| 1307 { | |
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1308 emsg(_(e_argreq)); |
| 7 | 1309 value = NULL; |
| 1310 } | |
| 1311 | |
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1312 // On error or when an exception is thrown during argument evaluation, do |
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1313 // not throw. |
| 7 | 1314 if (!eap->skip && value != NULL) |
| 1315 { | |
| 1316 if (throw_exception(value, ET_USER, NULL) == FAIL) | |
| 1317 vim_free(value); | |
| 1318 else | |
| 1319 do_throw(eap->cstack); | |
| 1320 } | |
| 1321 } | |
| 1322 | |
| 1323 /* | |
| 21 | 1324 * Throw the current exception through the specified cstack. Common routine |
| 1325 * for ":throw" (user exception) and error and interrupt exceptions. Also | |
| 1326 * used for rethrowing an uncaught exception. | |
| 7 | 1327 */ |
| 1328 void | |
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1329 do_throw(cstack_T *cstack) |
| 7 | 1330 { |
| 1331 int idx; | |
| 1332 int inactivate_try = FALSE; | |
| 1333 | |
| 1334 /* | |
| 1335 * Cleanup and inactivate up to the next surrounding try conditional that | |
| 1336 * is not in its finally clause. Normally, do not inactivate the try | |
| 1337 * conditional itself, so that its ACTIVE flag can be tested below. But | |
| 1338 * if a previous error or interrupt has not been converted to an exception, | |
| 1339 * inactivate the try conditional, too, as if the conversion had been done, | |
| 21 | 1340 * and reset the did_emsg or got_int flag, so this won't happen again at |
| 1341 * the next surrounding try conditional. | |
| 7 | 1342 */ |
| 1880 | 1343 #ifndef THROW_ON_ERROR_TRUE |
| 7 | 1344 if (did_emsg && !THROW_ON_ERROR) |
| 1345 { | |
| 1346 inactivate_try = TRUE; | |
| 1347 did_emsg = FALSE; | |
| 1348 } | |
| 1880 | 1349 #endif |
| 1350 #ifndef THROW_ON_INTERRUPT_TRUE | |
| 7 | 1351 if (got_int && !THROW_ON_INTERRUPT) |
| 1352 { | |
| 1353 inactivate_try = TRUE; | |
| 1354 got_int = FALSE; | |
| 1355 } | |
| 1880 | 1356 #endif |
| 7 | 1357 idx = cleanup_conditionals(cstack, 0, inactivate_try); |
| 1358 if (idx >= 0) | |
| 1359 { | |
| 1360 /* | |
| 1361 * If this try conditional is active and we are before its first | |
| 21 | 1362 * ":catch", set THROWN so that the ":catch" commands will check |
| 1363 * whether the exception matches. When the exception came from any of | |
| 1364 * the catch clauses, it will be made pending at the ":finally" (if | |
| 1365 * present) and rethrown at the ":endtry". This will also happen if | |
| 1366 * the try conditional is inactive. This is the case when we are | |
| 1367 * throwing an exception due to an error or interrupt on the way from | |
| 1368 * a preceding ":continue", ":break", ":return", ":finish", error or | |
| 1369 * interrupt (not converted to an exception) to the finally clause or | |
| 1370 * from a preceding throw of a user or error or interrupt exception to | |
| 1371 * the matching catch clause or the finally clause. | |
| 7 | 1372 */ |
| 1373 if (!(cstack->cs_flags[idx] & CSF_CAUGHT)) | |
| 1374 { | |
| 1375 if (cstack->cs_flags[idx] & CSF_ACTIVE) | |
| 1376 cstack->cs_flags[idx] |= CSF_THROWN; | |
| 1377 else | |
|
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1378 // THROWN may have already been set for a catchable exception |
|
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1379 // that has been discarded. Ensure it is reset for the new |
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|
1380 // exception. |
| 7 | 1381 cstack->cs_flags[idx] &= ~CSF_THROWN; |
| 1382 } | |
| 1383 cstack->cs_flags[idx] &= ~CSF_ACTIVE; | |
| 1384 cstack->cs_exception[idx] = current_exception; | |
| 1385 } | |
| 1386 #if 0 | |
|
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1387 // TODO: Add optimization below. Not yet done because of interface |
|
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|
1388 // problems to eval.c and ex_cmds2.c. (Servatius) |
| 7 | 1389 else |
| 1390 { | |
| 1391 /* | |
| 1392 * There are no catch clauses to check or finally clauses to execute. | |
| 1393 * End the current script or function. The exception will be rethrown | |
| 1394 * in the caller. | |
| 1395 */ | |
| 1396 if (getline_equal(eap->getline, eap->cookie, get_func_line)) | |
| 1397 current_funccal->returned = TRUE; | |
| 1398 elseif (eap->get_func_line == getsourceline) | |
| 1399 ((struct source_cookie *)eap->cookie)->finished = TRUE; | |
| 1400 } | |
| 1401 #endif | |
| 1402 | |
| 1403 did_throw = TRUE; | |
| 1404 } | |
| 1405 | |
| 1406 /* | |
| 1407 * ":try" | |
| 1408 */ | |
| 1409 void | |
|
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|
1410 ex_try(exarg_T *eap) |
| 7 | 1411 { |
| 1412 int skip; | |
|
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1413 cstack_T *cstack = eap->cstack; |
| 7 | 1414 |
| 1415 if (cstack->cs_idx == CSTACK_LEN - 1) | |
|
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1416 eap->errmsg = N_("E601: :try nesting too deep"); |
| 7 | 1417 else |
| 1418 { | |
| 1419 ++cstack->cs_idx; | |
| 1420 ++cstack->cs_trylevel; | |
| 1421 cstack->cs_flags[cstack->cs_idx] = CSF_TRY; | |
| 1422 cstack->cs_pending[cstack->cs_idx] = CSTP_NONE; | |
| 1423 | |
| 1424 /* | |
| 1425 * Don't do something after an error, interrupt, or throw, or when there | |
| 1426 * is a surrounding conditional and it was not active. | |
| 1427 */ | |
| 1428 skip = did_emsg || got_int || did_throw || (cstack->cs_idx > 0 | |
| 1429 && !(cstack->cs_flags[cstack->cs_idx - 1] & CSF_ACTIVE)); | |
| 1430 | |
| 1431 if (!skip) | |
| 1432 { | |
|
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1433 // Set ACTIVE and TRUE. TRUE means that the corresponding ":catch" |
|
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1434 // commands should check for a match if an exception is thrown and |
|
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|
1435 // that the finally clause needs to be executed. |
| 7 | 1436 cstack->cs_flags[cstack->cs_idx] |= CSF_ACTIVE | CSF_TRUE; |
| 1437 | |
| 1438 /* | |
| 1439 * ":silent!", even when used in a try conditional, disables | |
| 1440 * displaying of error messages and conversion of errors to | |
| 1441 * exceptions. When the silent commands again open a try | |
| 1442 * conditional, save "emsg_silent" and reset it so that errors are | |
| 1443 * again converted to exceptions. The value is restored when that | |
| 1444 * try conditional is left. If it is left normally, the commands | |
| 1445 * following the ":endtry" are again silent. If it is left by | |
| 1446 * a ":continue", ":break", ":return", or ":finish", the commands | |
| 1447 * executed next are again silent. If it is left due to an | |
| 1448 * aborting error, an interrupt, or an exception, restoring | |
| 1449 * "emsg_silent" does not matter since we are already in the | |
| 1450 * aborting state and/or the exception has already been thrown. | |
| 1451 * The effect is then just freeing the memory that was allocated | |
| 1452 * to save the value. | |
| 1453 */ | |
| 1454 if (emsg_silent) | |
| 1455 { | |
| 1456 eslist_T *elem; | |
| 1457 | |
|
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1458 elem = ALLOC_ONE(struct eslist_elem); |
| 7 | 1459 if (elem == NULL) |
|
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1460 emsg(_(e_outofmem)); |
| 7 | 1461 else |
| 1462 { | |
| 1463 elem->saved_emsg_silent = emsg_silent; | |
| 1464 elem->next = cstack->cs_emsg_silent_list; | |
| 1465 cstack->cs_emsg_silent_list = elem; | |
| 1466 cstack->cs_flags[cstack->cs_idx] |= CSF_SILENT; | |
| 1467 emsg_silent = 0; | |
| 1468 } | |
| 1469 } | |
| 1470 } | |
| 1471 | |
| 1472 } | |
| 1473 } | |
| 1474 | |
| 1475 /* | |
| 1476 * ":catch /{pattern}/" and ":catch" | |
| 1477 */ | |
| 1478 void | |
|
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|
1479 ex_catch(exarg_T *eap) |
| 7 | 1480 { |
| 1481 int idx = 0; | |
| 1482 int give_up = FALSE; | |
| 1483 int skip = FALSE; | |
| 1484 int caught = FALSE; | |
| 1485 char_u *end; | |
| 1486 int save_char = 0; | |
| 1487 char_u *save_cpo; | |
| 1488 regmatch_T regmatch; | |
| 1489 int prev_got_int; | |
|
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1490 cstack_T *cstack = eap->cstack; |
| 7 | 1491 char_u *pat; |
| 1492 | |
| 1493 if (cstack->cs_trylevel <= 0 || cstack->cs_idx < 0) | |
| 1494 { | |
|
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|
1495 eap->errmsg = N_("E603: :catch without :try"); |
| 7 | 1496 give_up = TRUE; |
| 1497 } | |
| 1498 else | |
| 1499 { | |
| 1500 if (!(cstack->cs_flags[cstack->cs_idx] & CSF_TRY)) | |
| 1501 { | |
|
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1502 // Report what's missing if the matching ":try" is not in its |
|
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|
1503 // finally clause. |
| 75 | 1504 eap->errmsg = get_end_emsg(cstack); |
| 7 | 1505 skip = TRUE; |
| 1506 } | |
| 1507 for (idx = cstack->cs_idx; idx > 0; --idx) | |
| 1508 if (cstack->cs_flags[idx] & CSF_TRY) | |
| 1509 break; | |
| 1510 if (cstack->cs_flags[idx] & CSF_FINALLY) | |
| 1511 { | |
|
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1512 // Give up for a ":catch" after ":finally" and ignore it. |
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1513 // Just parse. |
|
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|
1514 eap->errmsg = N_("E604: :catch after :finally"); |
| 7 | 1515 give_up = TRUE; |
| 1516 } | |
| 79 | 1517 else |
| 75 | 1518 rewind_conditionals(cstack, idx, CSF_WHILE | CSF_FOR, |
| 1519 &cstack->cs_looplevel); | |
| 7 | 1520 } |
| 1521 | |
|
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|
1522 if (ends_excmd(*eap->arg)) // no argument, catch all errors |
| 7 | 1523 { |
| 1524 pat = (char_u *)".*"; | |
| 1525 end = NULL; | |
| 1526 eap->nextcmd = find_nextcmd(eap->arg); | |
| 1527 } | |
| 1528 else | |
| 1529 { | |
| 1530 pat = eap->arg + 1; | |
| 1531 end = skip_regexp(pat, *eap->arg, TRUE, NULL); | |
| 1532 } | |
| 1533 | |
| 1534 if (!give_up) | |
| 1535 { | |
| 1536 /* | |
| 1537 * Don't do something when no exception has been thrown or when the | |
| 1538 * corresponding try block never got active (because of an inactive | |
| 1539 * surrounding conditional or after an error or interrupt or throw). | |
| 1540 */ | |
| 1541 if (!did_throw || !(cstack->cs_flags[idx] & CSF_TRUE)) | |
| 1542 skip = TRUE; | |
| 1543 | |
| 1544 /* | |
| 1545 * Check for a match only if an exception is thrown but not caught by | |
| 1546 * a previous ":catch". An exception that has replaced a discarded | |
| 1547 * exception is not checked (THROWN is not set then). | |
| 1548 */ | |
| 1549 if (!skip && (cstack->cs_flags[idx] & CSF_THROWN) | |
| 1550 && !(cstack->cs_flags[idx] & CSF_CAUGHT)) | |
| 1551 { | |
| 1552 if (end != NULL && *end != NUL && !ends_excmd(*skipwhite(end + 1))) | |
| 1553 { | |
|
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1554 emsg(_(e_trailing)); |
| 7 | 1555 return; |
| 1556 } | |
| 1557 | |
|
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1558 // When debugging or a breakpoint was encountered, display the |
|
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1559 // debug prompt (if not already done) before checking for a match. |
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1560 // This is a helpful hint for the user when the regular expression |
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1561 // matching fails. Handle a ">quit" debug command as if an |
|
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1562 // interrupt had occurred before the ":catch". That is, discard |
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1563 // the original exception, replace it by an interrupt exception, |
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1564 // and don't catch it in this try block. |
| 7 | 1565 if (!dbg_check_skipped(eap) || !do_intthrow(cstack)) |
| 1566 { | |
|
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1567 // Terminate the pattern and avoid the 'l' flag in 'cpoptions' |
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|
1568 // while compiling it. |
| 7 | 1569 if (end != NULL) |
| 1570 { | |
| 1571 save_char = *end; | |
| 1572 *end = NUL; | |
| 1573 } | |
| 1574 save_cpo = p_cpo; | |
| 1575 p_cpo = (char_u *)""; | |
|
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1576 // Disable error messages, it will make current_exception |
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1577 // invalid. |
|
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|
1578 ++emsg_off; |
| 1333 | 1579 regmatch.regprog = vim_regcomp(pat, RE_MAGIC + RE_STRING); |
|
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|
1580 --emsg_off; |
| 7 | 1581 regmatch.rm_ic = FALSE; |
| 1582 if (end != NULL) | |
| 1583 *end = save_char; | |
| 1584 p_cpo = save_cpo; | |
| 1585 if (regmatch.regprog == NULL) | |
|
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1586 semsg(_(e_invarg2), pat); |
| 7 | 1587 else |
| 1588 { | |
| 1589 /* | |
| 1590 * Save the value of got_int and reset it. We don't want | |
| 1591 * a previous interruption cancel matching, only hitting | |
| 1592 * CTRL-C while matching should abort it. | |
| 1593 */ | |
| 1594 prev_got_int = got_int; | |
| 1595 got_int = FALSE; | |
|
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1596 caught = vim_regexec_nl(®match, |
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1597 (char_u *)current_exception->value, (colnr_T)0); |
| 7 | 1598 got_int |= prev_got_int; |
|
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|
1599 vim_regfree(regmatch.regprog); |
| 7 | 1600 } |
| 1601 } | |
| 1602 } | |
| 1603 | |
| 1604 if (caught) | |
| 1605 { | |
|
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1606 // Make this ":catch" clause active and reset did_emsg, got_int, |
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1607 // and did_throw. Put the exception on the caught stack. |
| 7 | 1608 cstack->cs_flags[idx] |= CSF_ACTIVE | CSF_CAUGHT; |
| 1609 did_emsg = got_int = did_throw = FALSE; | |
| 1610 catch_exception((except_T *)cstack->cs_exception[idx]); | |
|
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1611 // It's mandatory that the current exception is stored in the cstack |
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1612 // so that it can be discarded at the next ":catch", ":finally", or |
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1613 // ":endtry" or when the catch clause is left by a ":continue", |
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1614 // ":break", ":return", ":finish", error, interrupt, or another |
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1615 // exception. |
| 7 | 1616 if (cstack->cs_exception[cstack->cs_idx] != current_exception) |
|
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1617 internal_error("ex_catch()"); |
| 7 | 1618 } |
| 1619 else | |
| 1620 { | |
| 1621 /* | |
| 1622 * If there is a preceding catch clause and it caught the exception, | |
| 1623 * finish the exception now. This happens also after errors except | |
| 1624 * when this ":catch" was after the ":finally" or not within | |
| 1625 * a ":try". Make the try conditional inactive so that the | |
| 1626 * following catch clauses are skipped. On an error or interrupt | |
| 1627 * after the preceding try block or catch clause was left by | |
| 1628 * a ":continue", ":break", ":return", or ":finish", discard the | |
| 1629 * pending action. | |
| 1630 */ | |
| 1631 cleanup_conditionals(cstack, CSF_TRY, TRUE); | |
| 1632 } | |
| 1633 } | |
| 1634 | |
| 1635 if (end != NULL) | |
| 1636 eap->nextcmd = find_nextcmd(end); | |
| 1637 } | |
| 1638 | |
| 1639 /* | |
| 1640 * ":finally" | |
| 1641 */ | |
| 1642 void | |
|
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1643 ex_finally(exarg_T *eap) |
| 7 | 1644 { |
| 1645 int idx; | |
| 1646 int skip = FALSE; | |
| 1647 int pending = CSTP_NONE; | |
|
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1648 cstack_T *cstack = eap->cstack; |
| 7 | 1649 |
| 1650 if (cstack->cs_trylevel <= 0 || cstack->cs_idx < 0) | |
|
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1651 eap->errmsg = N_("E606: :finally without :try"); |
| 7 | 1652 else |
| 1653 { | |
| 1654 if (!(cstack->cs_flags[cstack->cs_idx] & CSF_TRY)) | |
| 1655 { | |
| 75 | 1656 eap->errmsg = get_end_emsg(cstack); |
| 7 | 1657 for (idx = cstack->cs_idx - 1; idx > 0; --idx) |
| 1658 if (cstack->cs_flags[idx] & CSF_TRY) | |
| 1659 break; | |
|
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1660 // Make this error pending, so that the commands in the following |
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1661 // finally clause can be executed. This overrules also a pending |
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1662 // ":continue", ":break", ":return", or ":finish". |
| 7 | 1663 pending = CSTP_ERROR; |
| 1664 } | |
| 1665 else | |
| 1666 idx = cstack->cs_idx; | |
| 1667 | |
| 1668 if (cstack->cs_flags[idx] & CSF_FINALLY) | |
| 1669 { | |
|
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1670 // Give up for a multiple ":finally" and ignore it. |
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1671 eap->errmsg = N_("E607: multiple :finally"); |
| 7 | 1672 return; |
| 1673 } | |
| 79 | 1674 rewind_conditionals(cstack, idx, CSF_WHILE | CSF_FOR, |
| 75 | 1675 &cstack->cs_looplevel); |
| 7 | 1676 |
| 1677 /* | |
| 1678 * Don't do something when the corresponding try block never got active | |
| 1679 * (because of an inactive surrounding conditional or after an error or | |
| 1680 * interrupt or throw) or for a ":finally" without ":try" or a multiple | |
| 1681 * ":finally". After every other error (did_emsg or the conditional | |
| 1682 * errors detected above) or after an interrupt (got_int) or an | |
| 1683 * exception (did_throw), the finally clause must be executed. | |
| 1684 */ | |
| 1685 skip = !(cstack->cs_flags[cstack->cs_idx] & CSF_TRUE); | |
| 1686 | |
| 1687 if (!skip) | |
| 1688 { | |
|
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1689 // When debugging or a breakpoint was encountered, display the |
|
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1690 // debug prompt (if not already done). The user then knows that the |
|
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1691 // finally clause is executed. |
| 7 | 1692 if (dbg_check_skipped(eap)) |
| 1693 { | |
|
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1694 // Handle a ">quit" debug command as if an interrupt had |
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1695 // occurred before the ":finally". That is, discard the |
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1696 // original exception and replace it by an interrupt |
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1697 // exception. |
| 7 | 1698 (void)do_intthrow(cstack); |
| 1699 } | |
| 1700 | |
| 1701 /* | |
| 1702 * If there is a preceding catch clause and it caught the exception, | |
| 1703 * finish the exception now. This happens also after errors except | |
| 1704 * when this is a multiple ":finally" or one not within a ":try". | |
| 1705 * After an error or interrupt, this also discards a pending | |
| 1706 * ":continue", ":break", ":finish", or ":return" from the preceding | |
| 1707 * try block or catch clause. | |
| 1708 */ | |
| 1709 cleanup_conditionals(cstack, CSF_TRY, FALSE); | |
| 1710 | |
| 1711 /* | |
| 1712 * Make did_emsg, got_int, did_throw pending. If set, they overrule | |
| 1713 * a pending ":continue", ":break", ":return", or ":finish". Then | |
| 1714 * we have particularly to discard a pending return value (as done | |
| 1715 * by the call to cleanup_conditionals() above when did_emsg or | |
| 1716 * got_int is set). The pending values are restored by the | |
| 1717 * ":endtry", except if there is a new error, interrupt, exception, | |
| 1718 * ":continue", ":break", ":return", or ":finish" in the following | |
| 75 | 1719 * finally clause. A missing ":endwhile", ":endfor" or ":endif" |
| 1720 * detected here is treated as if did_emsg and did_throw had | |
| 1721 * already been set, respectively in case that the error is not | |
| 1722 * converted to an exception, did_throw had already been unset. | |
| 1723 * We must not set did_emsg here since that would suppress the | |
| 1724 * error message. | |
| 7 | 1725 */ |
| 1726 if (pending == CSTP_ERROR || did_emsg || got_int || did_throw) | |
| 1727 { | |
| 1728 if (cstack->cs_pending[cstack->cs_idx] == CSTP_RETURN) | |
| 1729 { | |
| 1730 report_discard_pending(CSTP_RETURN, | |
| 68 | 1731 cstack->cs_rettv[cstack->cs_idx]); |
| 1732 discard_pending_return(cstack->cs_rettv[cstack->cs_idx]); | |
| 7 | 1733 } |
| 1734 if (pending == CSTP_ERROR && !did_emsg) | |
| 1735 pending |= (THROW_ON_ERROR) ? CSTP_THROW : 0; | |
| 1736 else | |
| 1737 pending |= did_throw ? CSTP_THROW : 0; | |
| 1738 pending |= did_emsg ? CSTP_ERROR : 0; | |
| 1739 pending |= got_int ? CSTP_INTERRUPT : 0; | |
| 1740 cstack->cs_pending[cstack->cs_idx] = pending; | |
| 1741 | |
|
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1742 // It's mandatory that the current exception is stored in the |
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1743 // cstack so that it can be rethrown at the ":endtry" or be |
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1744 // discarded if the finally clause is left by a ":continue", |
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1745 // ":break", ":return", ":finish", error, interrupt, or another |
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1746 // exception. When emsg() is called for a missing ":endif" or |
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1747 // a missing ":endwhile"/":endfor" detected here, the |
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1748 // exception will be discarded. |
| 79 | 1749 if (did_throw && cstack->cs_exception[cstack->cs_idx] |
| 1750 != current_exception) | |
|
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1751 internal_error("ex_finally()"); |
| 7 | 1752 } |
| 1753 | |
| 1754 /* | |
| 75 | 1755 * Set CSL_HAD_FINA, so do_cmdline() will reset did_emsg, |
| 22 | 1756 * got_int, and did_throw and make the finally clause active. |
| 1757 * This will happen after emsg() has been called for a missing | |
| 75 | 1758 * ":endif" or a missing ":endwhile"/":endfor" detected here, so |
| 1759 * that the following finally clause will be executed even then. | |
| 7 | 1760 */ |
| 75 | 1761 cstack->cs_lflags |= CSL_HAD_FINA; |
| 7 | 1762 } |
| 1763 } | |
| 1764 } | |
| 1765 | |
| 1766 /* | |
| 1767 * ":endtry" | |
| 1768 */ | |
| 1769 void | |
|
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1770 ex_endtry(exarg_T *eap) |
| 7 | 1771 { |
| 1772 int idx; | |
| 1773 int skip; | |
| 1774 int rethrow = FALSE; | |
| 1775 int pending = CSTP_NONE; | |
| 68 | 1776 void *rettv = NULL; |
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1777 cstack_T *cstack = eap->cstack; |
| 7 | 1778 |
| 1779 if (cstack->cs_trylevel <= 0 || cstack->cs_idx < 0) | |
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1780 eap->errmsg = N_("E602: :endtry without :try"); |
| 7 | 1781 else |
| 1782 { | |
| 1783 /* | |
| 1784 * Don't do something after an error, interrupt or throw in the try | |
| 1785 * block, catch clause, or finally clause preceding this ":endtry" or | |
| 1786 * when an error or interrupt occurred after a ":continue", ":break", | |
| 1787 * ":return", or ":finish" in a try block or catch clause preceding this | |
| 1788 * ":endtry" or when the try block never got active (because of an | |
| 1789 * inactive surrounding conditional or after an error or interrupt or | |
| 1790 * throw) or when there is a surrounding conditional and it has been | |
| 1791 * made inactive by a ":continue", ":break", ":return", or ":finish" in | |
| 1792 * the finally clause. The latter case need not be tested since then | |
| 1793 * anything pending has already been discarded. */ | |
| 1794 skip = did_emsg || got_int || did_throw || | |
| 1795 !(cstack->cs_flags[cstack->cs_idx] & CSF_TRUE); | |
| 1796 | |
| 1797 if (!(cstack->cs_flags[cstack->cs_idx] & CSF_TRY)) | |
| 1798 { | |
| 75 | 1799 eap->errmsg = get_end_emsg(cstack); |
|
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1800 // Find the matching ":try" and report what's missing. |
| 7 | 1801 idx = cstack->cs_idx; |
| 1802 do | |
| 1803 --idx; | |
| 1804 while (idx > 0 && !(cstack->cs_flags[idx] & CSF_TRY)); | |
| 75 | 1805 rewind_conditionals(cstack, idx, CSF_WHILE | CSF_FOR, |
| 1806 &cstack->cs_looplevel); | |
| 7 | 1807 skip = TRUE; |
| 1808 | |
| 1809 /* | |
| 1810 * If an exception is being thrown, discard it to prevent it from | |
| 1811 * being rethrown at the end of this function. It would be | |
| 1812 * discarded by the error message, anyway. Resets did_throw. | |
| 1813 * This does not affect the script termination due to the error | |
| 1814 * since "trylevel" is decremented after emsg() has been called. | |
| 1815 */ | |
| 1816 if (did_throw) | |
| 1817 discard_current_exception(); | |
| 1818 } | |
| 1819 else | |
| 1820 { | |
| 1821 idx = cstack->cs_idx; | |
| 1822 | |
| 1823 /* | |
| 1824 * If we stopped with the exception currently being thrown at this | |
| 1825 * try conditional since we didn't know that it doesn't have | |
| 1826 * a finally clause, we need to rethrow it after closing the try | |
| 1827 * conditional. | |
| 1828 */ | |
| 1829 if (did_throw && (cstack->cs_flags[idx] & CSF_TRUE) | |
| 1830 && !(cstack->cs_flags[idx] & CSF_FINALLY)) | |
| 1831 rethrow = TRUE; | |
| 1832 } | |
| 1833 | |
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1834 // If there was no finally clause, show the user when debugging or |
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1835 // a breakpoint was encountered that the end of the try conditional has |
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1836 // been reached: display the debug prompt (if not already done). Do |
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1837 // this on normal control flow or when an exception was thrown, but not |
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1838 // on an interrupt or error not converted to an exception or when |
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1839 // a ":break", ":continue", ":return", or ":finish" is pending. These |
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1840 // actions are carried out immediately. |
| 7 | 1841 if ((rethrow || (!skip |
| 1842 && !(cstack->cs_flags[idx] & CSF_FINALLY) | |
| 1843 && !cstack->cs_pending[idx])) | |
| 1844 && dbg_check_skipped(eap)) | |
| 1845 { | |
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1846 // Handle a ">quit" debug command as if an interrupt had occurred |
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1847 // before the ":endtry". That is, throw an interrupt exception and |
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1848 // set "skip" and "rethrow". |
| 7 | 1849 if (got_int) |
| 1850 { | |
| 1851 skip = TRUE; | |
| 1852 (void)do_intthrow(cstack); | |
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1853 // The do_intthrow() call may have reset did_throw or |
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1854 // cstack->cs_pending[idx]. |
| 7 | 1855 rethrow = FALSE; |
| 1856 if (did_throw && !(cstack->cs_flags[idx] & CSF_FINALLY)) | |
| 1857 rethrow = TRUE; | |
| 1858 } | |
| 1859 } | |
| 1860 | |
| 1861 /* | |
| 1862 * If a ":return" is pending, we need to resume it after closing the | |
| 1863 * try conditional; remember the return value. If there was a finally | |
| 1864 * clause making an exception pending, we need to rethrow it. Make it | |
| 1865 * the exception currently being thrown. | |
| 1866 */ | |
| 1867 if (!skip) | |
| 1868 { | |
| 1869 pending = cstack->cs_pending[idx]; | |
| 1870 cstack->cs_pending[idx] = CSTP_NONE; | |
| 1871 if (pending == CSTP_RETURN) | |
| 68 | 1872 rettv = cstack->cs_rettv[idx]; |
| 7 | 1873 else if (pending & CSTP_THROW) |
| 1874 current_exception = cstack->cs_exception[idx]; | |
| 1875 } | |
| 1876 | |
| 1877 /* | |
| 1878 * Discard anything pending on an error, interrupt, or throw in the | |
| 1879 * finally clause. If there was no ":finally", discard a pending | |
| 1880 * ":continue", ":break", ":return", or ":finish" if an error or | |
| 1881 * interrupt occurred afterwards, but before the ":endtry" was reached. | |
| 1882 * If an exception was caught by the last of the catch clauses and there | |
| 1883 * was no finally clause, finish the exception now. This happens also | |
| 1884 * after errors except when this ":endtry" is not within a ":try". | |
| 1885 * Restore "emsg_silent" if it has been reset by this try conditional. | |
| 1886 */ | |
| 840 | 1887 (void)cleanup_conditionals(cstack, CSF_TRY | CSF_SILENT, TRUE); |
| 7 | 1888 |
| 1889 --cstack->cs_idx; | |
| 1890 --cstack->cs_trylevel; | |
| 1891 | |
| 1892 if (!skip) | |
| 1893 { | |
| 1894 report_resume_pending(pending, | |
| 68 | 1895 (pending == CSTP_RETURN) ? rettv : |
| 7 | 1896 (pending & CSTP_THROW) ? (void *)current_exception : NULL); |
| 1897 switch (pending) | |
| 1898 { | |
| 1899 case CSTP_NONE: | |
| 1900 break; | |
| 1901 | |
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1902 // Reactivate a pending ":continue", ":break", ":return", |
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1903 // ":finish" from the try block or a catch clause of this try |
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1904 // conditional. This is skipped, if there was an error in an |
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1905 // (unskipped) conditional command or an interrupt afterwards |
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1906 // or if the finally clause is present and executed a new error, |
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1907 // interrupt, throw, ":continue", ":break", ":return", or |
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1908 // ":finish". |
| 7 | 1909 case CSTP_CONTINUE: |
| 1910 ex_continue(eap); | |
| 1911 break; | |
| 1912 case CSTP_BREAK: | |
| 1913 ex_break(eap); | |
| 1914 break; | |
| 1915 case CSTP_RETURN: | |
| 68 | 1916 do_return(eap, FALSE, FALSE, rettv); |
| 7 | 1917 break; |
| 1918 case CSTP_FINISH: | |
| 1919 do_finish(eap, FALSE); | |
| 1920 break; | |
| 1921 | |
|
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1922 // When the finally clause was entered due to an error, |
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1923 // interrupt or throw (as opposed to a ":continue", ":break", |
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1924 // ":return", or ":finish"), restore the pending values of |
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1925 // did_emsg, got_int, and did_throw. This is skipped, if there |
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1926 // was a new error, interrupt, throw, ":continue", ":break", |
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1927 // ":return", or ":finish". in the finally clause. |
| 7 | 1928 default: |
| 1929 if (pending & CSTP_ERROR) | |
| 1930 did_emsg = TRUE; | |
| 1931 if (pending & CSTP_INTERRUPT) | |
| 1932 got_int = TRUE; | |
| 1933 if (pending & CSTP_THROW) | |
| 1934 rethrow = TRUE; | |
| 1935 break; | |
| 1936 } | |
| 1937 } | |
| 1938 | |
| 1939 if (rethrow) | |
|
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1940 // Rethrow the current exception (within this cstack). |
| 7 | 1941 do_throw(cstack); |
| 1942 } | |
| 1943 } | |
| 1944 | |
| 1945 /* | |
| 36 | 1946 * enter_cleanup() and leave_cleanup() |
| 1947 * | |
| 1948 * Functions to be called before/after invoking a sequence of autocommands for | |
| 1949 * cleanup for a failed command. (Failure means here that a call to emsg() | |
| 1950 * has been made, an interrupt occurred, or there is an uncaught exception | |
| 1951 * from a previous autocommand execution of the same command.) | |
| 24 | 1952 * |
| 36 | 1953 * Call enter_cleanup() with a pointer to a cleanup_T and pass the same |
| 1954 * pointer to leave_cleanup(). The cleanup_T structure stores the pending | |
| 1955 * error/interrupt/exception state. | |
| 1956 */ | |
| 1957 | |
| 1958 /* | |
| 1959 * This function works a bit like ex_finally() except that there was not | |
| 1960 * actually an extra try block around the part that failed and an error or | |
| 1961 * interrupt has not (yet) been converted to an exception. This function | |
| 1962 * saves the error/interrupt/ exception state and prepares for the call to | |
| 1963 * do_cmdline() that is going to be made for the cleanup autocommand | |
| 1964 * execution. | |
| 24 | 1965 */ |
| 1966 void | |
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1967 enter_cleanup(cleanup_T *csp) |
| 24 | 1968 { |
| 1969 int pending = CSTP_NONE; | |
| 1970 | |
| 1971 /* | |
| 1972 * Postpone did_emsg, got_int, did_throw. The pending values will be | |
| 1973 * restored by leave_cleanup() except if there was an aborting error, | |
| 1974 * interrupt, or uncaught exception after this function ends. | |
| 1975 */ | |
| 1976 if (did_emsg || got_int || did_throw || need_rethrow) | |
| 1977 { | |
| 1978 csp->pending = (did_emsg ? CSTP_ERROR : 0) | |
| 1979 | (got_int ? CSTP_INTERRUPT : 0) | |
| 1980 | (did_throw ? CSTP_THROW : 0) | |
| 1981 | (need_rethrow ? CSTP_THROW : 0); | |
| 1982 | |
|
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1983 // If we are currently throwing an exception (did_throw), save it as |
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1984 // well. On an error not yet converted to an exception, update |
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1985 // "force_abort" and reset "cause_abort" (as do_errthrow() would do). |
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1986 // This is needed for the do_cmdline() call that is going to be made |
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1987 // for autocommand execution. We need not save *msg_list because |
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1988 // there is an extra instance for every call of do_cmdline(), anyway. |
| 24 | 1989 if (did_throw || need_rethrow) |
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1990 { |
| 24 | 1991 csp->exception = current_exception; |
|
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1992 current_exception = NULL; |
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1993 } |
| 24 | 1994 else |
| 1995 { | |
| 1996 csp->exception = NULL; | |
| 1997 if (did_emsg) | |
| 1998 { | |
| 1999 force_abort |= cause_abort; | |
| 2000 cause_abort = FALSE; | |
| 2001 } | |
| 2002 } | |
| 2003 did_emsg = got_int = did_throw = need_rethrow = FALSE; | |
| 2004 | |
|
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2005 // Report if required by the 'verbose' option or when debugging. |
| 24 | 2006 report_make_pending(pending, csp->exception); |
| 2007 } | |
| 2008 else | |
| 2009 { | |
| 2010 csp->pending = CSTP_NONE; | |
| 2011 csp->exception = NULL; | |
| 2012 } | |
| 2013 } | |
| 2014 | |
| 2015 /* | |
| 36 | 2016 * See comment above enter_cleanup() for how this function is used. |
| 2017 * | |
| 2018 * This function is a bit like ex_endtry() except that there was not actually | |
| 2019 * an extra try block around the part that failed and an error or interrupt | |
| 2020 * had not (yet) been converted to an exception when the cleanup autocommand | |
| 2021 * sequence was invoked. | |
| 2022 * | |
| 2023 * This function has to be called with the address of the cleanup_T structure | |
| 2024 * filled by enter_cleanup() as an argument; it restores the error/interrupt/ | |
| 2025 * exception state saved by that function - except there was an aborting | |
| 2026 * error, an interrupt or an uncaught exception during execution of the | |
| 2027 * cleanup autocommands. In the latter case, the saved error/interrupt/ | |
| 2028 * exception state is discarded. | |
| 24 | 2029 */ |
| 2030 void | |
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2031 leave_cleanup(cleanup_T *csp) |
| 24 | 2032 { |
| 2033 int pending = csp->pending; | |
| 2034 | |
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2035 if (pending == CSTP_NONE) // nothing to do |
| 24 | 2036 return; |
| 2037 | |
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2038 // If there was an aborting error, an interrupt, or an uncaught exception |
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2039 // after the corresponding call to enter_cleanup(), discard what has been |
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2040 // made pending by it. Report this to the user if required by the |
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2041 // 'verbose' option or when debugging. |
| 24 | 2042 if (aborting() || need_rethrow) |
| 2043 { | |
| 2044 if (pending & CSTP_THROW) | |
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2045 // Cancel the pending exception (includes report). |
| 24 | 2046 discard_exception((except_T *)csp->exception, FALSE); |
| 2047 else | |
| 2048 report_discard_pending(pending, NULL); | |
| 2049 | |
|
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2050 // If an error was about to be converted to an exception when |
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2051 // enter_cleanup() was called, free the message list. |
| 1046 | 2052 if (msg_list != NULL) |
| 5517 | 2053 free_global_msglist(); |
| 24 | 2054 } |
| 2055 | |
| 2056 /* | |
| 2057 * If there was no new error, interrupt, or throw between the calls | |
| 2058 * to enter_cleanup() and leave_cleanup(), restore the pending | |
| 2059 * error/interrupt/exception state. | |
| 2060 */ | |
| 2061 else | |
| 2062 { | |
| 2063 /* | |
| 2064 * If there was an exception being thrown when enter_cleanup() was | |
| 2065 * called, we need to rethrow it. Make it the exception currently | |
| 2066 * being thrown. | |
| 2067 */ | |
| 2068 if (pending & CSTP_THROW) | |
| 2069 current_exception = csp->exception; | |
| 2070 | |
| 2071 /* | |
| 2072 * If an error was about to be converted to an exception when | |
| 2073 * enter_cleanup() was called, let "cause_abort" take the part of | |
| 2074 * "force_abort" (as done by cause_errthrow()). | |
| 2075 */ | |
| 2076 else if (pending & CSTP_ERROR) | |
| 2077 { | |
| 2078 cause_abort = force_abort; | |
| 2079 force_abort = FALSE; | |
| 2080 } | |
| 2081 | |
| 2082 /* | |
| 2083 * Restore the pending values of did_emsg, got_int, and did_throw. | |
| 2084 */ | |
| 2085 if (pending & CSTP_ERROR) | |
| 2086 did_emsg = TRUE; | |
| 2087 if (pending & CSTP_INTERRUPT) | |
| 2088 got_int = TRUE; | |
| 2089 if (pending & CSTP_THROW) | |
|
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2090 need_rethrow = TRUE; // did_throw will be set by do_one_cmd() |
| 24 | 2091 |
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2092 // Report if required by the 'verbose' option or when debugging. |
| 24 | 2093 report_resume_pending(pending, |
| 36 | 2094 (pending & CSTP_THROW) ? (void *)current_exception : NULL); |
| 24 | 2095 } |
| 2096 } | |
| 2097 | |
| 2098 | |
| 2099 /* | |
| 7 | 2100 * Make conditionals inactive and discard what's pending in finally clauses |
| 2101 * until the conditional type searched for or a try conditional not in its | |
| 79 | 2102 * finally clause is reached. If this is in an active catch clause, finish |
| 2103 * the caught exception. | |
| 2104 * Return the cstack index where the search stopped. | |
| 75 | 2105 * Values used for "searched_cond" are (CSF_WHILE | CSF_FOR) or CSF_TRY or 0, |
| 2106 * the latter meaning the innermost try conditional not in its finally clause. | |
| 2107 * "inclusive" tells whether the conditional searched for should be made | |
| 4352 | 2108 * inactive itself (a try conditional not in its finally clause possibly find |
| 75 | 2109 * before is always made inactive). If "inclusive" is TRUE and |
| 2110 * "searched_cond" is CSF_TRY|CSF_SILENT, the saved former value of | |
| 2111 * "emsg_silent", if reset when the try conditional finally reached was | |
| 4352 | 2112 * entered, is restored (used by ex_endtry()). This is normally done only |
| 75 | 2113 * when such a try conditional is left. |
| 7 | 2114 */ |
| 2115 int | |
|
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2116 cleanup_conditionals( |
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2117 cstack_T *cstack, |
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2118 int searched_cond, |
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2119 int inclusive) |
| 7 | 2120 { |
| 2121 int idx; | |
| 2122 int stop = FALSE; | |
| 2123 | |
| 2124 for (idx = cstack->cs_idx; idx >= 0; --idx) | |
| 2125 { | |
| 2126 if (cstack->cs_flags[idx] & CSF_TRY) | |
| 2127 { | |
| 2128 /* | |
| 2129 * Discard anything pending in a finally clause and continue the | |
| 2130 * search. There may also be a pending ":continue", ":break", | |
| 2131 * ":return", or ":finish" before the finally clause. We must not | |
| 2132 * discard it, unless an error or interrupt occurred afterwards. | |
| 2133 */ | |
| 359 | 2134 if (did_emsg || got_int || (cstack->cs_flags[idx] & CSF_FINALLY)) |
| 7 | 2135 { |
| 2136 switch (cstack->cs_pending[idx]) | |
| 2137 { | |
| 2138 case CSTP_NONE: | |
| 2139 break; | |
| 2140 | |
| 2141 case CSTP_CONTINUE: | |
| 2142 case CSTP_BREAK: | |
| 2143 case CSTP_FINISH: | |
| 2144 report_discard_pending(cstack->cs_pending[idx], NULL); | |
| 2145 cstack->cs_pending[idx] = CSTP_NONE; | |
| 2146 break; | |
| 2147 | |
| 2148 case CSTP_RETURN: | |
| 2149 report_discard_pending(CSTP_RETURN, | |
| 68 | 2150 cstack->cs_rettv[idx]); |
| 2151 discard_pending_return(cstack->cs_rettv[idx]); | |
| 7 | 2152 cstack->cs_pending[idx] = CSTP_NONE; |
| 2153 break; | |
| 2154 | |
| 2155 default: | |
| 2156 if (cstack->cs_flags[idx] & CSF_FINALLY) | |
| 2157 { | |
| 2158 if (cstack->cs_pending[idx] & CSTP_THROW) | |
| 2159 { | |
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2160 // Cancel the pending exception. This is in the |
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2161 // finally clause, so that the stack of the |
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2162 // caught exceptions is not involved. |
| 7 | 2163 discard_exception((except_T *) |
| 2164 cstack->cs_exception[idx], | |
| 2165 FALSE); | |
| 2166 } | |
| 2167 else | |
| 2168 report_discard_pending(cstack->cs_pending[idx], | |
| 2169 NULL); | |
| 2170 cstack->cs_pending[idx] = CSTP_NONE; | |
| 2171 } | |
| 2172 break; | |
| 2173 } | |
| 2174 } | |
| 2175 | |
| 2176 /* | |
| 2177 * Stop at a try conditional not in its finally clause. If this try | |
| 2178 * conditional is in an active catch clause, finish the caught | |
| 2179 * exception. | |
| 2180 */ | |
| 2181 if (!(cstack->cs_flags[idx] & CSF_FINALLY)) | |
| 2182 { | |
| 2183 if ((cstack->cs_flags[idx] & CSF_ACTIVE) | |
| 2184 && (cstack->cs_flags[idx] & CSF_CAUGHT)) | |
| 2185 finish_exception((except_T *)cstack->cs_exception[idx]); | |
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2186 // Stop at this try conditional - except the try block never |
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2187 // got active (because of an inactive surrounding conditional |
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2188 // or when the ":try" appeared after an error or interrupt or |
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2189 // throw). |
| 7 | 2190 if (cstack->cs_flags[idx] & CSF_TRUE) |
| 2191 { | |
| 2192 if (searched_cond == 0 && !inclusive) | |
| 2193 break; | |
| 2194 stop = TRUE; | |
| 2195 } | |
| 2196 } | |
| 2197 } | |
| 2198 | |
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2199 // Stop on the searched conditional type (even when the surrounding |
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2200 // conditional is not active or something has been made pending). |
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2201 // If "inclusive" is TRUE and "searched_cond" is CSF_TRY|CSF_SILENT, |
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2202 // check first whether "emsg_silent" needs to be restored. |
| 7 | 2203 if (cstack->cs_flags[idx] & searched_cond) |
| 2204 { | |
| 2205 if (!inclusive) | |
| 2206 break; | |
| 2207 stop = TRUE; | |
| 2208 } | |
| 2209 cstack->cs_flags[idx] &= ~CSF_ACTIVE; | |
| 2210 if (stop && searched_cond != (CSF_TRY | CSF_SILENT)) | |
| 2211 break; | |
| 2212 | |
| 2213 /* | |
| 1214 | 2214 * When leaving a try conditional that reset "emsg_silent" on its |
| 2215 * entry after saving the original value, restore that value here and | |
| 2216 * free the memory used to store it. | |
| 7 | 2217 */ |
| 2218 if ((cstack->cs_flags[idx] & CSF_TRY) | |
| 359 | 2219 && (cstack->cs_flags[idx] & CSF_SILENT)) |
| 7 | 2220 { |
| 2221 eslist_T *elem; | |
| 2222 | |
| 2223 elem = cstack->cs_emsg_silent_list; | |
| 2224 cstack->cs_emsg_silent_list = elem->next; | |
| 2225 emsg_silent = elem->saved_emsg_silent; | |
| 2226 vim_free(elem); | |
| 2227 cstack->cs_flags[idx] &= ~CSF_SILENT; | |
| 2228 } | |
| 2229 if (stop) | |
| 2230 break; | |
| 2231 } | |
| 2232 return idx; | |
| 2233 } | |
| 2234 | |
| 2235 /* | |
| 75 | 2236 * Return an appropriate error message for a missing endwhile/endfor/endif. |
| 2237 */ | |
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2238 static char * |
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2239 get_end_emsg(cstack_T *cstack) |
| 75 | 2240 { |
| 2241 if (cstack->cs_flags[cstack->cs_idx] & CSF_WHILE) | |
| 2242 return e_endwhile; | |
| 2243 if (cstack->cs_flags[cstack->cs_idx] & CSF_FOR) | |
| 2244 return e_endfor; | |
| 2245 return e_endif; | |
| 2246 } | |
| 2247 | |
| 2248 | |
| 2249 /* | |
| 7 | 2250 * Rewind conditionals until index "idx" is reached. "cond_type" and |
| 2251 * "cond_level" specify a conditional type and the address of a level variable | |
| 2252 * which is to be decremented with each skipped conditional of the specified | |
| 2253 * type. | |
| 79 | 2254 * Also free "for info" structures where needed. |
| 7 | 2255 */ |
| 79 | 2256 void |
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2257 rewind_conditionals( |
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2258 cstack_T *cstack, |
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2259 int idx, |
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2260 int cond_type, |
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2261 int *cond_level) |
| 7 | 2262 { |
| 2263 while (cstack->cs_idx > idx) | |
| 2264 { | |
| 2265 if (cstack->cs_flags[cstack->cs_idx] & cond_type) | |
| 2266 --*cond_level; | |
| 79 | 2267 if (cstack->cs_flags[cstack->cs_idx] & CSF_FOR) |
| 2268 free_for_info(cstack->cs_forinfo[cstack->cs_idx]); | |
| 7 | 2269 --cstack->cs_idx; |
| 2270 } | |
| 2271 } | |
| 2272 | |
| 2273 /* | |
| 2274 * ":endfunction" when not after a ":function" | |
| 2275 */ | |
| 2276 void | |
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2277 ex_endfunction(exarg_T *eap UNUSED) |
| 7 | 2278 { |
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2279 emsg(_("E193: :endfunction not inside a function")); |
| 7 | 2280 } |
| 2281 | |
| 2282 /* | |
| 75 | 2283 * Return TRUE if the string "p" looks like a ":while" or ":for" command. |
| 7 | 2284 */ |
| 2285 int | |
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2286 has_loop_cmd(char_u *p) |
| 7 | 2287 { |
| 1447 | 2288 int len; |
| 2289 | |
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2290 // skip modifiers, white space and ':' |
| 1447 | 2291 for (;;) |
| 2292 { | |
| 2293 while (*p == ' ' || *p == '\t' || *p == ':') | |
| 2294 ++p; | |
| 2295 len = modifier_len(p); | |
| 2296 if (len == 0) | |
| 2297 break; | |
| 2298 p += len; | |
| 2299 } | |
| 75 | 2300 if ((p[0] == 'w' && p[1] == 'h') |
| 2301 || (p[0] == 'f' && p[1] == 'o' && p[2] == 'r')) | |
| 7 | 2302 return TRUE; |
| 2303 return FALSE; | |
| 2304 } | |
| 2305 | |
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2306 #endif // FEAT_EVAL |