Skip to content
This repository
branch: exceptions_ref…
Fetching contributors…

Cannot retrieve contributors at this time

file 787 lines (563 sloc) 22.134 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787
/*
Copyright (C) 2001-2009, Parrot Foundation.
$Id$

=head1 NAME

src/pmc/exception.pmc - Exception PMC

=head1 DESCRIPTION

This is the exception base class. An exception object has the following
attributes:

=over 4

=item C<message>

Textual representation of the exception.

=item C<severity>

The severity of the exception, (see F<include/parrot/exceptions.h>,
F<except_severity.pasm>).

=item C<type>

The type of the exception.

=item C<exit_code>

The exit code of the exception. (Added temporarily, to be removed.)

=item C<handled>

Whether the exception has been handled. Defaults to 0, 1 for handled, -1 for a
rethrown exception.

=item C<payload>

Additional data for the exception.

=back

When an exception handler is called, the exception object is passed as
as the first argument, the message as the second argument of the call.
These arguments can be retrieved with the C<get_results> opcode.

=cut

*/

#include "parrot/exceptions.h"
#include "pmc/pmc_sub.h"

pmclass Exception auto_attrs {

    ATTR INTVAL id; /* The task ID in the scheduler. */
    ATTR FLOATVAL birthtime; /* The creation time stamp of the exception. */
    ATTR STRING *message; /* The exception message. */
    ATTR PMC *payload; /* The payload for the exception. */
    ATTR PMC *resume; /* Continuation for resuming after handling the exception. */
    ATTR INTVAL severity; /* The severity of the exception. */
    ATTR INTVAL type; /* The type of the exception. */
    ATTR INTVAL exit_code; /* The exit code of the exception. */
    ATTR PMC *backtrace; /* The backtrace of an exception. */
    ATTR INTVAL handled; /* Whether the exception has been handled. */
    ATTR PMC *handler_iter; /* An iterator of handlers (for rethrow). */
    ATTR PMC *handler_ctx; /* A stored context for handler iterator. */
    ATTR PMC *thrower; /* The position we were at when thrown. */

/*

=head2 Vtable Functions

=over 4

=item C<void init()>

Initializes the exception with default values.

=cut

*/

    VTABLE void init() {
        /* Set flags for custom GC mark and destroy. */
        PObj_custom_mark_SET(SELF);

        SET_ATTR_severity(INTERP, SELF, EXCEPT_error);
        SET_ATTR_handled(INTERP, SELF, 0);
        SET_ATTR_message(INTERP, SELF, NULL);
        SET_ATTR_payload(INTERP, SELF, PMCNULL);
        SET_ATTR_resume(INTERP, SELF, PMCNULL);
        SET_ATTR_backtrace(INTERP, SELF, PMCNULL);
        SET_ATTR_handler_iter(INTERP, SELF, PMCNULL);
    }

/*

=item C<void init_pmc()>

Initializes the exception with supplied values.

=cut

*/

    VTABLE void init_pmc(PMC *values) {
        INTVAL severity_val;
        STRING *message_val;

        INTVAL ishash = VTABLE_isa(interp, values, CONST_STRING(interp, 'Hash'));

        if (ishash) {
            STRING * const severity = CONST_STRING(interp, "severity");
            STRING * const message = CONST_STRING(interp, "message");
            severity_val = VTABLE_get_integer_keyed_str(interp, values, severity);
            message_val = VTABLE_get_string_keyed_str(interp, values, message);
        }
        else {
            severity_val = EXCEPT_error;
            message_val = VTABLE_get_string(interp, values);
        }

        /* Set flags for custom GC mark. */
        PObj_custom_mark_SET(SELF);

        /* Set up the core struct and default values for the exception object. */

        SET_ATTR_severity(INTERP, SELF, severity_val);
        SET_ATTR_handled(INTERP, SELF, 0);
        SET_ATTR_message(INTERP, SELF, message_val);
        SET_ATTR_payload(INTERP, SELF, PMCNULL);
        SET_ATTR_resume(INTERP, SELF, PMCNULL);
        SET_ATTR_backtrace(INTERP, SELF, PMCNULL);
        SET_ATTR_handler_iter(INTERP, SELF, PMCNULL);

    }

/*

=item C<void mark()>

Mark any active exception data as live.

=cut

*/

    VTABLE void mark() {
        Parrot_Exception_attributes * const core_struct = PARROT_EXCEPTION(SELF);
        Parrot_gc_mark_STRING_alive(interp, core_struct->message);
        Parrot_gc_mark_PMC_alive(interp, core_struct->payload);
        Parrot_gc_mark_PMC_alive(interp, core_struct->resume);
        Parrot_gc_mark_PMC_alive(interp, core_struct->backtrace);
        Parrot_gc_mark_PMC_alive(interp, core_struct->handler_iter);
        Parrot_gc_mark_PMC_alive(interp, core_struct->handler_ctx);
        Parrot_gc_mark_PMC_alive(interp, core_struct->thrower);
    }

/*

=item C<INTVAL get_bool()>

Return true.

=cut

*/

    VTABLE INTVAL get_bool() {
        return 1;
    }

/*

=item C<STRING *get_string()>

Return the exception message.

=cut

*/

    VTABLE STRING *get_string() {
        STRING *message;
        GET_ATTR_message(interp, SELF, message);
        if (STRING_IS_NULL(message))
            message = CONST_STRING(interp, "");
        return message;
    }

/*

=item C<INTVAL get_integer()>

Returns the id of the exception.

=cut

*/

    VTABLE INTVAL get_integer() {
        Parrot_Exception_attributes * const exception = PARROT_EXCEPTION(SELF);
        return exception->id;
    }

/*

=item C<STRING *get_string_keyed(PMC *key)>

Returns the Parrot string value for C<*key>. The only current recognized
C<key> is "message".

=cut

*/

    VTABLE STRING *get_string_keyed(PMC *key) {
        STRING *name = VTABLE_get_string(INTERP, key);
        STRING *message;

        if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "message"))) {
            message = SELF.get_string();
        }
        else {
            /* If unknown attribute name, throw an exception. */
            Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_ATTRIB_NOT_FOUND,
                "No such string attribute '%S'", name);
        }

        return message;
    }

/*

=item C<INTVAL get_integer_keyed(PMC *key)>

Returns the integer value for C<*key>.

=cut

*/

    VTABLE INTVAL get_integer_keyed(PMC *key) {
        STRING *name = VTABLE_get_string(INTERP, key);
        INTVAL result = 0;

        if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "type"))) {
            GET_ATTR_type(interp, SELF, result);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "severity"))) {
            GET_ATTR_severity(interp, SELF, result);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "exit_code"))) {
            GET_ATTR_exit_code(interp, SELF, result);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "handled"))) {
            GET_ATTR_handled(interp, SELF, result);
        }
        else {
            /* If unknown attribute name, throw an exception. */
            Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_ATTRIB_NOT_FOUND,
                "No such integer attribute '%S'", name);
        }

        return result;
    }

/*

=item C<INTVAL get_integer_keyed_str(STRING *key)>

Returns the integer value for C<*key>.

=cut

*/

    VTABLE INTVAL get_integer_keyed_str(STRING *key) {
        INTVAL result = 0;

        if (Parrot_str_equal(INTERP, key, CONST_STRING(INTERP, "type"))) {
            GET_ATTR_type(interp, SELF, result);
        }
        else if (Parrot_str_equal(INTERP, key, CONST_STRING(INTERP, "severity"))) {
            GET_ATTR_severity(interp, SELF, result);
        }
        else if (Parrot_str_equal(INTERP, key, CONST_STRING(INTERP, "exit_code"))) {
            GET_ATTR_exit_code(interp, SELF, result);
        }
        else if (Parrot_str_equal(INTERP, key, CONST_STRING(INTERP, "handled"))) {
            GET_ATTR_handled(interp, SELF, result);
        }
        else {
            /* If unknown attribute name, throw an exception. */
            Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_ATTRIB_NOT_FOUND,
                "No such integer attribute '%S'", key);
        }

        return result;
    }

/*

=item C<PMC *get_pmc_keyed(PMC *key)>

Returns the PMC value for C<*key>.

=cut

*/

    VTABLE PMC *get_pmc_keyed(PMC *key) {
        STRING *s = VTABLE_get_string(INTERP, key);
        return SELF.get_attr_str(s);
    }


/*

=item C<void set_string_native(STRING *value)>

Sets the C<message> of the Exception.

=cut

*/

    VTABLE void set_string_native(STRING *value) {
        SET_ATTR_message(interp, SELF, value);
    }


/*

=item C<void set_integer_native(INTVAL *value)>

Sets the C<id> of the Exception.

=cut

*/

    VTABLE void set_integer_native(INTVAL value) {
        SET_ATTR_id(interp, SELF, value);
    }

/*

=item C<void set_number_native(FLOATVAL value)>

Sets the birthtime of the exception.

=cut

*/

    VTABLE void set_number_native(FLOATVAL value) {
        SET_ATTR_birthtime(interp, SELF, value);
    }


/*

=item C<void set_string_keyed(PMC *key, STRING *value)>

Sets the Parrot string value for C<*key>.

=cut

*/

    VTABLE void set_string_keyed(PMC *key, STRING *value) {
        STRING *name = VTABLE_get_string(INTERP, key);

        if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "message"))) {
            SELF.set_string_native(value);
        }
        else {
            /* If unknown attribute name, throw an exception. */
            Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_ATTRIB_NOT_FOUND,
                "No such string attribute '%S'", name);
        }
    }

/*

=item C<void set_integer_keyed(PMC *key, INTVAL value)>

Sets the integer value for C<*key>.

=cut

*/

    VTABLE void set_integer_keyed(PMC *key, INTVAL value) {
        STRING *name = VTABLE_get_string(INTERP, key);

        if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "type"))) {
            SET_ATTR_type(interp, SELF, value);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "severity"))) {
            SET_ATTR_severity(interp, SELF, value);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "exit_code"))) {
            SET_ATTR_exit_code(interp, SELF, value);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "handled"))) {
            SET_ATTR_handled(interp, SELF, value);
        }
        else {
            /* If unknown attribute name, throw an exception. */
            Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_ATTRIB_NOT_FOUND,
                "No such integer attribute '%S'", name);
        }
    }

/*

=item C<void set_integer_keyed_str(STRING *key, INTVAL value) >

Sets the integer value for C<*key>.

=cut

*/

    VTABLE void set_integer_keyed_str(STRING *key, INTVAL value) {
        if (Parrot_str_equal(INTERP, key, CONST_STRING(INTERP, "type"))) {
            SET_ATTR_type(interp, SELF, value);
        }
        else if (Parrot_str_equal(INTERP, key, CONST_STRING(INTERP, "severity"))) {
            SET_ATTR_severity(interp, SELF, value);
        }
        else if (Parrot_str_equal(INTERP, key, CONST_STRING(INTERP, "exit_code"))) {
            SET_ATTR_exit_code(interp, SELF, value);
        }
        else if (Parrot_str_equal(INTERP, key, CONST_STRING(INTERP, "handled"))) {
            SET_ATTR_handled(interp, SELF, value);
        }
        else {
            /* If unknown attribute name, throw an exception. */
            Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_ATTRIB_NOT_FOUND,
                "No such integer attribute '%S'", key);
        }
    }

/*

=item C<void set_pmc_keyed(PMC *key, PMC *value)>

Sets the PMC value for C<*key>.

=cut

*/

    VTABLE void set_pmc_keyed(PMC *key, PMC *value) {
        STRING *s = VTABLE_get_string(INTERP, key);
        SELF.set_attr_str(s, value);
    }

/*

=item C<void set_pmc_keyed_str(STRING *key, PMC *value)>

Sets the PMC value for C<*key>.

=cut

*/

    VTABLE void set_pmc_keyed_str(STRING *key, PMC *value) {
        SELF.set_attr_str(key, value);
    }

/*

=item C<void set_pointer(void *context)>

Store a context for the handler iterator.

=cut

*/

    VTABLE void set_pointer(void *context) {
        Parrot_Exception_attributes * const core_struct = PARROT_EXCEPTION(SELF);

        core_struct->handler_ctx = (PMC*)context;
    }

/*

=item C<void *get_pointer()>

Retrieve a context stored for the handler iterator.

=cut

*/

    VTABLE void *get_pointer() {
        Parrot_Exception_attributes * const core_struct = PARROT_EXCEPTION(SELF);
        return core_struct->handler_ctx;
    }

/*

=item C<INTVAL is_equal(PMC *value)>

Compare the passed in Exception with C<SELF>. Returns true if C<SELF> and
C<value> are the same type, and have the same values for type, severity, and
exit_code.

=cut

*/
    VTABLE INTVAL is_equal(PMC *value) {
        STRING * const exception_str = CONST_STRING(INTERP, "Exception");

        if (value->vtable->base_type == SELF->vtable->base_type
        && VTABLE_isa(INTERP, value, exception_str)) {
            INTVAL self_compare, value_compare;
            GET_ATTR_type(interp, SELF, self_compare);
            GET_ATTR_type(interp, value, value_compare);
            if (self_compare == value_compare) {
                GET_ATTR_severity(interp, SELF, self_compare);
                GET_ATTR_severity(interp, value, value_compare);
                if (self_compare == value_compare) {
                    GET_ATTR_exit_code(interp, SELF, self_compare);
                    GET_ATTR_exit_code(interp, value, value_compare);
                    if (self_compare == value_compare)
                        return 1;
                }
            }
        }

        return 0;
    }

/*

=item C<get_attr_str>

Retrieve an attribute value for the exception object.

=cut

*/
    VTABLE PMC *get_attr_str(STRING *name) {
        PMC *value = PMCNULL;

        if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "type"))) {
                INTVAL type;
                GET_ATTR_type(interp, SELF, type);
                value = Parrot_pmc_new(interp, enum_class_Integer);
                VTABLE_set_integer_native(interp, value, type);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "severity"))) {
                INTVAL severity;
                GET_ATTR_severity(interp, SELF, severity);
                value = Parrot_pmc_new(interp, enum_class_Integer);
                VTABLE_set_integer_native(interp, value, severity);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "exit_code"))) {
                INTVAL exit_code;
                GET_ATTR_exit_code(interp, SELF, exit_code);
                value = Parrot_pmc_new(interp, enum_class_Integer);
                VTABLE_set_integer_native(interp, value, exit_code);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "handled"))) {
                INTVAL handled;
                GET_ATTR_handled(interp, SELF, handled);
                value = Parrot_pmc_new(interp, enum_class_Integer);
                VTABLE_set_integer_native(interp, value, handled);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "message"))) {
                STRING *message = SELF.get_string();
                value = Parrot_pmc_new(interp, enum_class_String);
                VTABLE_set_string_native(interp, value, message);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "payload"))) {
                GET_ATTR_payload(interp, SELF, value);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "resume"))) {
                GET_ATTR_resume(interp, SELF, value);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "backtrace"))) {
                GET_ATTR_backtrace(interp, SELF, value);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "handler_iter"))) {
                GET_ATTR_handler_iter(interp, SELF, value);
        }
        else {
            /* If unknown attribute name, throw an exception. */
            Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_ATTRIB_NOT_FOUND,
                "No such attribute '%S'", name);
        }

        return value;
    }

/*

=item C<set_attr_str>

Set an attribute value for the exception object.

=cut

*/
    VTABLE void set_attr_str(STRING *name, PMC *value) {

        if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "type"))) {
            INTVAL type = VTABLE_get_integer(interp, value);
            SET_ATTR_type(interp, SELF, type);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "severity"))) {
            INTVAL severity = VTABLE_get_integer(interp, value);
            SET_ATTR_severity(interp, SELF, severity);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "exit_code"))) {
            INTVAL exit_code = VTABLE_get_integer(interp, value);
            SET_ATTR_exit_code(interp, SELF, exit_code);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "handled"))) {
            INTVAL handled = VTABLE_get_integer(interp, value);
            SET_ATTR_handled(interp, SELF, handled);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "message"))) {
            STRING *message = VTABLE_get_string(interp, value);
            SELF.set_string_native(message);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "payload"))) {
            SET_ATTR_payload(interp, SELF, value);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "resume"))) {
            SET_ATTR_resume(interp, SELF, value);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "backtrace"))) {
            SET_ATTR_backtrace(interp, SELF, value);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "handler_iter"))) {
            SET_ATTR_handler_iter(interp, SELF, value);
        }
        else if (Parrot_str_equal(INTERP, name, CONST_STRING(INTERP, "thrower"))) {
            /* Ensure it's a ret cont, and extract the from_ctx.
             * XXX TT #596 - when we have Context PMCs, just take and set that. */
            if (!PMC_IS_NULL(value) && VTABLE_isa(interp, value, CONST_STRING(interp, "Continuation"))) {
                PMC *ctx = PMC_cont(value)->from_ctx;
                if (!PMC_IS_NULL(ctx))
                    SET_ATTR_thrower(interp, SELF, ctx);
            }
        }
        else {
            /* If unknown attribute name, throw an exception. */
            Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_ATTRIB_NOT_FOUND,
                "No such attribute '%S'", name);
        }

    }

/*

=item C<PMC *share_ro()>

Set this PMC as shared.

=cut

*/

    VTABLE PMC *share_ro() {
        PMC *shared_self;
        Parrot_Exception_attributes *shared_struct;

        if (PObj_is_PMC_shared_TEST(SELF))
            return SELF;

        shared_self = pt_shared_fixup(INTERP, SELF);
        shared_struct = PARROT_EXCEPTION(shared_self);

        if (!PMC_IS_NULL(shared_struct->payload))
            shared_struct->payload = pt_shared_fixup(INTERP, shared_struct->payload);

        if (!PMC_IS_NULL(shared_struct->backtrace))
            shared_struct->backtrace = pt_shared_fixup(INTERP, shared_struct->backtrace);

        if (!PMC_IS_NULL(shared_struct->handler_iter))
            shared_struct->handler_iter = pt_shared_fixup(INTERP, shared_struct->handler_iter);

        return shared_self;
    }


/*

=item C<PMC *annotations>

Gets any bytecode annotations in force at the point where the exception was
thrown. If the optional name of an annotation is specified, gets just that
annotation. If not, returns a Hash of all of them.

=cut

*/

    METHOD annotations(STRING *name :optional, INTVAL have_name :opt_flag) {
        PMC *resume;
        PMC *result = PMCNULL;

        /* Get resume continuation, to find location we failed at. */
        GET_ATTR_resume(interp, SELF, resume);
        if (!PMC_IS_NULL(resume)) {
            Parrot_Continuation_attributes *cont = PARROT_CONTINUATION(resume);
            if (cont->seg != NULL && cont->seg->annotations != NULL)
                result = PackFile_Annotations_lookup(interp, cont->seg->annotations,
                        cont->address - cont->seg->base.data, name);
        }

        /* If we didn't have a key specified and we found no annotations to
         * return, should return an empty hash. */
        if (!have_name && PMC_IS_NULL(result))
            result = Parrot_pmc_new(interp, enum_class_Hash);

        RETURN(PMC *result);
    }


/*

=item C<PMC *backtrace>

Gets a representation of the backtrace at the point that this exception was
thrown. Returns an array of hashes. Each array element represents a caller in
the backtrace, the most recent caller first. The hash has two keys: C<sub>,
which holds the PMC representing the sub, and C<annotations> which is a hash
of the annotations at the point where the exception was thrown for the current
sub, or for the point of the call a level deeper for the rest.

=cut

*/

    METHOD backtrace() {
        PMC *result = PMCNULL;
        PMC *resume;
        PMC *cur_ctx;
        Parrot_Continuation_attributes *cont;

        /* Get starting context, then loop over them. */
        GET_ATTR_resume(interp, SELF, resume);
        if (!PMC_IS_NULL(resume)) {
            /* We have a resume continuation, so we can get the address from
             * that. */
            cont = PARROT_CONTINUATION(resume);
            Parrot_pcc_invoke_method_from_c_args(INTERP, cont->to_ctx, CONST_STRING(interp, "backtrace"), "P->P", resume, &result);
        }
        else {
            /* No return continuation. Assuming we're being called */
            cont = NULL;
            GET_ATTR_thrower(interp, SELF, cur_ctx);
            Parrot_pcc_invoke_method_from_c_args(INTERP, CURRENT_CONTEXT(INTERP), CONST_STRING(interp, "backtrace"), "->P", &result);
        }

        RETURN(PMC *result);
    }


/*

=back

=cut

*/

}

/*
 * Local variables:
 * c-file-style: "parrot"
 * End:
 * vim: expandtab shiftwidth=4:
 */
Something went wrong with that request. Please try again.