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exceptionhandler.pmc
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exceptionhandler.pmc
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/*
Copyright (C) 2001-2008, Parrot Foundation.
$Id$
=head1 NAME
src/pmc/exceptionhandler.pmc - Exception Handler PMC
=head1 DESCRIPTION
When an exception handler is called, the exception object is passed as
C<REG_PMC(interp, 5)>, the original contents of this register is in the
exception object's C<_P5> attribute.
=head2 Methods
=over 4
=cut
*/
#include "parrot/oplib/ops.h"
pmclass ExceptionHandler extends Continuation auto_attrs {
ATTR PMC *handled_items;
ATTR INTVAL inclusive;
ATTR INTVAL class_based;
ATTR INTVAL min_severity;
ATTR INTVAL max_severity;
/*
=item C<void init()>
Initializes the exception handler.
=cut
*/
VTABLE void init() {
Parrot_ExceptionHandler_attributes * const attrs = PARROT_EXCEPTIONHANDLER(SELF);
SUPER();
attrs->invoked = 0;
attrs->min_severity = 0;
attrs->max_severity = 0;
attrs->inclusive = -1;
attrs->class_based = -1;
attrs->handled_items = PMCNULL;
/* an exception handler has no separate context; it's only a snapshot
* of an "earlier" context, which is contained in the interpreter's
* context - the stacks can only be deeper in the interpreter - so no
* mark of context is needed */
PObj_custom_mark_SET(SELF);
}
/*
=item C<void mark()>
Mark any active exception handler data as live.
=cut
*/
VTABLE void mark() {
Parrot_ExceptionHandler_attributes * const attrs =
PARROT_EXCEPTIONHANDLER(SELF);
Parrot_gc_mark_PMC_alive(interp, attrs->handled_items);
SUPER();
}
VTABLE PMC *clone() {
PMC * const result = SUPER();
/* This looks wrong, why wouldn't we want to mark the clone? */
PObj_custom_mark_CLEAR(result);
return result;
}
/*
=item C<void set_integer_native(INTVAL)>
Mark whether the handler has been invoked.
=cut
*/
VTABLE void set_integer_native(INTVAL value) {
PARROT_CONTINUATION(SELF)->invoked = value;
}
/*
=item C<INTVAL get_integer()>
Check whether the handler has been invoked.
=cut
*/
VTABLE INTVAL get_integer() {
return PARROT_CONTINUATION(SELF)->invoked;
}
/*
=item C<opcode_t *invoke(void *next)>
Set up the environment for the exception handler to be invoked.
=cut
*/
VTABLE opcode_t *invoke(void *next) {
opcode_t * const pc = PARROT_CONTINUATION(SELF)->address;
Parrot_continuation_check(interp, SELF);
Parrot_continuation_rewind_environment(interp, SELF);
/* switch code segment if needed */
if (INTERP->code != PARROT_CONTINUATION(SELF)->seg)
Parrot_switch_to_cs(INTERP, PARROT_CONTINUATION(SELF)->seg, 1);
return pc;
}
/*
=back
=head2 Methods
=over 4
=cut
*/
/*
=item C<METHOD can_handle(PMC *exception)>
Report whether the exception handler can handle a particular type of exception.
=cut
*/
METHOD can_handle(PMC *exception) {
STRING * const sev = CONST_STRING(interp, "severity");
STRING * const ex_str = CONST_STRING(interp, "Exception");
INTVAL severity = VTABLE_get_integer_keyed_str(interp, exception, sev);
if (exception->vtable->base_type == enum_class_Exception
|| VTABLE_isa(INTERP, exception, ex_str)) {
PMC *handled_items;
INTVAL inclusive, min_severity, max_severity;
GET_ATTR_handled_items(INTERP, SELF, handled_items);
GET_ATTR_max_severity(INTERP, SELF, max_severity);
GET_ATTR_min_severity(INTERP, SELF, min_severity);
GET_ATTR_inclusive(INTERP, SELF, inclusive);
if (severity < min_severity) {
RETURN(INTVAL 0);
}
if (max_severity > 0 && severity > max_severity) {
RETURN(INTVAL 0);
}
if (! PMC_IS_NULL(handled_items)) {
const INTVAL elems = VTABLE_elements(interp, handled_items);
const INTVAL type = VTABLE_get_integer_keyed_str(interp, exception, CONST_STRING(interp, "type"));
INTVAL i;
INTVAL match = inclusive ? 1 : 0;
INTVAL not_match = inclusive ? 0 : 1;
for (i = 0; i < elems; i++) {
INTVAL handled_type = VTABLE_get_integer_keyed_int(interp,
handled_items, i);
if (handled_type == type)
RETURN(INTVAL match);
}
RETURN(INTVAL not_match);
}
else if (max_severity > 0 || min_severity > 0) {
RETURN(INTVAL 1);
}
RETURN(INTVAL 1);
}
RETURN(INTVAL 0);
}
/*
=item C<METHOD min_severity(INTVAL severity :optional, INTVAL have_severity :opt_flag)>
Set or get the minimum severity of the exception handler.
=cut
*/
METHOD min_severity(INTVAL severity :optional, INTVAL have_severity :opt_flag) {
Parrot_ExceptionHandler_attributes * const attrs =
PARROT_EXCEPTIONHANDLER(SELF);
if (have_severity)
attrs->min_severity = severity;
else
severity = attrs->min_severity;
RETURN(INTVAL severity);
}
/*
=item C<METHOD max_severity(INTVAL severity :optional, INTVAL have_severity :opt_flag)>
Set or get the maximum severity of the exception handler.
=cut
*/
METHOD max_severity(INTVAL severity :optional, INTVAL have_severity :opt_flag) {
Parrot_ExceptionHandler_attributes * const attrs =
PARROT_EXCEPTIONHANDLER(SELF);
if (have_severity)
attrs->max_severity = severity;
else
severity = attrs->max_severity;
RETURN(INTVAL severity);
}
/*
=item C<METHOD handle_types(PMC *types :slurpy)>
Set the exception types that the ExceptionHandler will handle.
=cut
*/
METHOD handle_types(PMC *types :slurpy) {
Parrot_ExceptionHandler_attributes * const attrs =
PARROT_EXCEPTIONHANDLER(SELF);
attrs->handled_items =
VTABLE_elements(interp, types) > 0
? types
: PMCNULL;
attrs->inclusive = 1;
attrs->class_based = 0;
}
/*
=item C<METHOD handle_types_except(PMC *types :slurpy)>
Set the exception types that the ExceptionHandler will not handle.
=cut
*/
METHOD handle_types_except(PMC *types :slurpy) {
Parrot_ExceptionHandler_attributes * const attrs =
PARROT_EXCEPTIONHANDLER(SELF);
attrs->handled_items =
VTABLE_elements(interp, types) > 0
? types
: PMCNULL;
attrs->inclusive = 0;
attrs->class_based = 0;
}
/*
=item C<METHOD handle_classes(PMC *classes :slurpy)>
Set the exception classes that the ExceptionHandler will handle.
=cut
*/
METHOD handle_classes(PMC *classes :slurpy) {
Parrot_ExceptionHandler_attributes * const attrs =
PARROT_EXCEPTIONHANDLER(SELF);
attrs->handled_items =
VTABLE_elements(interp, classes) > 0
? classes
: PMCNULL;
attrs->inclusive = 1;
attrs->class_based = 1;
}
/*
=item C<METHOD handle_classes_except(PMC *classes :slurpy)>
Set the exception classes that the ExceptionHandler will not handle.
=cut
*/
METHOD handle_classes_except(PMC *classes :slurpy) {
Parrot_ExceptionHandler_attributes * const attrs =
PARROT_EXCEPTIONHANDLER(SELF);
attrs->handled_items =
VTABLE_elements(interp, classes) > 0
? classes
: PMCNULL;
attrs->inclusive = 0;
attrs->class_based = 1;
}
}
/*
=back
=cut
*/
/*
* Local variables:
* c-file-style: "parrot"
* End:
* vim: expandtab shiftwidth=4:
*/