ExpressionOperator.cpp
Is it possible to catch an exception during the evaluation of operator, and
try something else with the same arguments ?
According to my tests, surrounding by catch/try is not enough.
The evaluation stack is probably in a bad state in the catch{}, I don't
know how to bring it back to a good state.
I tried to do like the catch in RexxActivation::run, but without success
(unwindToFrame and stack.clear).
The "something else" is an alternate way to find a candidate
implementation, where the dispatching is not limited to the first argument.
Thanks.
Jean-Louis
RexxObject *RexxBinaryOperator::evaluate(
RexxActivation *context, /* current activation context
*/
RexxExpressionStack *stack ) /* evaluation stack
*/
/******************************************************************************/
/* Function: Execute a REXX binary
operator */
/******************************************************************************/
{
/* evaluate the target */
RexxObject *left = this->left_term->evaluate(context, stack);
/* evaluate the right term */
RexxObject *right = this->right_term->evaluate(context, stack);
* try
{
* /* evaluate the message */
RexxObject *result = callOperatorMethod(left, this->oper, right);
/* replace top two stack elements */
stack->operatorResult(result); /* with this
one */
/* trace if
necessary */
context->traceOperator(operatorName(), result);
return result; /* return the
result */
* }
catch (RexxActivation *t)
{
// try something else with the same arguments left and right
}
*}
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