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exceptionhandler.pmc
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exceptionhandler.pmc
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/*
Copyright (C) 2001-2011, Parrot Foundation.
=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"
#include "pmc/pmc_exception.h"
/* HEADERIZER HFILE: none */
/* HEADERIZER BEGIN: static */
/* HEADERIZER END: static */
pmclass ExceptionHandler extends Continuation provides invokable auto_attrs {
ATTR PMC *handled_types;
ATTR PMC *handled_types_except;
ATTR INTVAL min_severity;
ATTR INTVAL max_severity;
/*
=item C<void init()>
Initializes the exception handler.
=cut
*/
VTABLE void init() {
SUPER();
/* 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 init_int(INTVAL)>
Initializes the exception handler with one handled type.
=cut
*/
VTABLE void init_int(INTVAL handledtype) {
Parrot_ExceptionHandler_attributes * const attrs = PARROT_EXCEPTIONHANDLER(SELF);
SELF.init();
attrs->handled_types = Parrot_pmc_new_init_int(INTERP, enum_class_FixedIntegerArray, 1);
VTABLE_set_integer_keyed_int(INTERP, attrs->handled_types, 0, handledtype);
}
/*
=item C<void init_pmc(PMC)>
Initializes the exception handler with one handled type. If the argument
is a key, intitialize it with the key contents.
=cut
*/
VTABLE void init_pmc(PMC *handledtype) {
Parrot_ExceptionHandler_attributes * const attrs = PARROT_EXCEPTIONHANDLER(SELF);
SELF.init();
if (handledtype->vtable->base_type == enum_class_Key) {
PMC *key;
/* check if the key only consists of integers */
for (key = handledtype; key; key = Parrot_key_next(INTERP, key))
if ((PObj_get_FLAGS(key) & KEY_type_FLAGS) != KEY_integer_FLAG)
break;
if (!key) {
/* yes, directly use the key */
attrs->handled_types = handledtype;
return;
}
/* no, create a RPA from the key */
attrs->handled_types = Parrot_pmc_new(interp, enum_class_ResizablePMCArray);
for (key = handledtype; key; key = Parrot_key_next(INTERP, key))
VTABLE_push_integer(interp, attrs->handled_types, Parrot_key_integer(INTERP, key));
}
else {
INTVAL type = VTABLE_get_integer(INTERP, handledtype);
attrs->handled_types = Parrot_pmc_new_init_int(INTERP, enum_class_FixedIntegerArray, 1);
VTABLE_set_integer_keyed_int(INTERP, attrs->handled_types, 0, type);
}
}
/*
=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_types);
Parrot_gc_mark_PMC_alive(INTERP, attrs->handled_types_except);
SUPER();
}
/*
=item C<PMC * get_attr_str(STRING *attr)>
Get the value of an attribute by name
=cut
*/
VTABLE PMC * get_attr_str(STRING *attr) {
PMC * val = PMCNULL;
INTVAL ival;
/*if (STRING_equal(INTERP, attr, CONST_STRING(INTERP, "seg")))
GET_ATTR_seg(INTERP, SELF, val);*/
if (STRING_equal(INTERP, attr, CONST_STRING(INTERP, "to_ctx")))
GET_ATTR_to_ctx(INTERP, SELF, val);
else if (STRING_equal(INTERP, attr, CONST_STRING(INTERP, "to_call_object")))
GET_ATTR_to_call_object(INTERP, SELF, val);
else if (STRING_equal(INTERP, attr, CONST_STRING(INTERP, "from_ctx")))
GET_ATTR_from_ctx(INTERP, SELF, val);
else if (STRING_equal(INTERP, attr, CONST_STRING(INTERP, "runloop_id"))) {
GET_ATTR_runloop_id(INTERP, SELF, ival);
val = Parrot_pmc_box_integer(INTERP, ival);
}
else if (STRING_equal(INTERP, attr, CONST_STRING(INTERP, "invoked"))) {
GET_ATTR_invoked(INTERP, SELF, ival);
val = Parrot_pmc_box_integer(INTERP, ival);
}
else
val = SUPER(attr);
return val;
}
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_sub_continuation_check(INTERP, SELF);
Parrot_sub_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 ex_str = CONST_STRING(INTERP, "Exception");
/* We handle Exception and anything that claims to implement that role
here. Include the base_type check as a sort of optimization */
if (exception->vtable->base_type == enum_class_Exception
|| VTABLE_isa(INTERP, exception, ex_str)) {
INTVAL severity;
PMC *handled_types;
PMC *handled_types_except;
INTVAL min_severity, max_severity;
GET_ATTR_max_severity(INTERP, SELF, max_severity);
GET_ATTR_min_severity(INTERP, SELF, min_severity);
if (exception->vtable->base_type == enum_class_Exception)
GETATTR_Exception_severity(INTERP, exception, severity);
else {
STRING * const severity_str = CONST_STRING(INTERP, "severity");
severity = VTABLE_get_integer_keyed_str(INTERP, exception, severity_str);
}
if (severity < min_severity) {
RETURN(INTVAL 0);
}
if (max_severity > 0 && severity > max_severity) {
RETURN(INTVAL 0);
}
GET_ATTR_handled_types(INTERP, SELF, handled_types);
if (! PMC_IS_NULL(handled_types)) {
INTVAL type;
if (exception->vtable->base_type == enum_class_Exception)
GETATTR_Exception_type(INTERP, exception, type);
else {
STRING * const type_str = CONST_STRING(INTERP, "type");
type = VTABLE_get_integer_keyed_str(INTERP, exception, type_str);
}
if (handled_types->vtable->base_type == enum_class_Key) {
PMC *key = handled_types;
for (; key; key = Parrot_key_next(INTERP, key)) {
const INTVAL handled_type = Parrot_key_integer(INTERP, key);
if (handled_type == type ||
handled_type == (type | EXCEPTION_TYPE_ALL_MASK))
RETURN(INTVAL 1);
}
}
else {
const INTVAL elems = VTABLE_elements(INTERP, handled_types);
INTVAL i;
for (i = 0; i < elems; ++i) {
const INTVAL handled_type =
VTABLE_get_integer_keyed_int(INTERP, handled_types, i);
if (handled_type == type ||
handled_type == (type | EXCEPTION_TYPE_ALL_MASK))
RETURN(INTVAL 1);
}
}
RETURN(INTVAL 0);
}
GET_ATTR_handled_types_except(INTERP, SELF, handled_types_except);
if (! PMC_IS_NULL(handled_types_except)) {
const INTVAL elems = VTABLE_elements(INTERP, handled_types_except);
INTVAL i, type;
if (exception->vtable->base_type == enum_class_Exception)
GETATTR_Exception_type(INTERP, exception, type);
else {
STRING * const type_str = CONST_STRING(INTERP, "type");
type = VTABLE_get_integer_keyed_str(INTERP, exception, type_str);
}
for (i = 0; i < elems; ++i) {
const INTVAL handled_type = VTABLE_get_integer_keyed_int(INTERP,
handled_types_except, i);
if (handled_type == type || handled_type == (type | EXCEPTION_TYPE_ALL_MASK))
RETURN(INTVAL 0);
}
}
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_types =
VTABLE_elements(INTERP, types) > 0
? types
: PMCNULL;
}
/*
=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_types_except =
VTABLE_elements(INTERP, types) > 0
? types
: PMCNULL;
}
}
/*
=back
=cut
*/
/*
* Local variables:
* c-file-style: "parrot"
* End:
* vim: expandtab shiftwidth=4 cinoptions='\:2=2' :
*/