ExpressionList.cpp

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/******************************************************************************/
/* REXX Translator                                                            */
/*                                                                            */
/* Primitive logical list evaluator                                           */
/*                                                                            */
/******************************************************************************/
#include "RexxCore.h"
#include "ExpressionList.hpp"
#include "QueueClass.hpp"
#include "RexxActivation.hpp"
#include "ArrayClass.hpp"
#include "RexxInstruction.hpp"
 
 
/**
 * Create a new expression list object.
 *
 * @param size   The size of the class object.
 * @param count  The count of logical expressions.  Used to adjust the
 *               allocated size to the requirements.
 *
 * @return A new RexxExpressionLogical object.
 */
void *RexxExpressionList::operator new(size_t size, size_t  count)
{
    return new_object(size + (count - 1) * sizeof(RexxObject *), T_ListTerm);
}
 
 
/**
 * Constructor for a RexxExpressionList object.
 *
 * @param count  The number of expressions in the list.
 * @param list   The accumulated list of expressions.
 */
RexxExpressionList::RexxExpressionList(size_t count, RexxQueue *list)
{
    expressionCount = count;
 
    // now copy the expressions from the sub term stack
    // NOTE:  The expressionss are in last-to-first order on the stack.
    initializeObjectArray(count, expressions, RexxInternalObject, list);
}
 
 
/**
 * The runtime, non-debug live marking routine.
 */
void RexxExpressionList::live(size_t liveMark)
{
    memory_mark_array(expressionCount, expressions);
}
 
 
/**
 * The generalized live marking routine used for non-performance
 * critical marking operations.
 */
void RexxExpressionList::liveGeneral(int reason)
{
    memory_mark_general_array(expressionCount, expressions);
}
 
 
/**
 * The flattening routine, used for serializing object trees.
 *
 * @param envelope The envelope were's flattening into.
 */
void RexxExpressionList::flatten(RexxEnvelope *envelope)
{
    setUpFlatten(RexxExpressionList)
 
    flattenArrayRefs(expressionCount, expressions);
 
    cleanUpFlatten
}
 
/**
 * Evaluate an expression list.
 *
 * @param context The execution context.
 * @param stack   The evaluation stack.
 *
 * @return An array
 */
RexxObject *RexxExpressionList::evaluate(RexxActivation *context, RexxExpressionStack *stack)
{
    // loop through the expression list evaulating and then testing for the
    // logical value
    size_t count = expressionCount;
 
    // save the top of the stack for popping values off later.
    size_t stacktop = stack->location();
 
    // create a result array with a matching size
    RexxArray *result = new_array(expressionCount);
    ProtectedObject resultP(result);
 
    for (size_t i = 0; i < count; i++)
    {
        // evaluate and trace
        RexxInternalObject *expr = expressions[i];
        // if this is a real expression (omitted expressions are permitted)
        if (expr != OREF_NULL)
        {
            RexxObject *value = expr->evaluate(context, stack);
            // trace this as an argument value
            // context->traceArgument(value);
            context->traceIntermediate(value, TRACE_PREFIX_ARGUMENT);
 
            // add this to the created array
            result->put(value, i + 1);
        }
    }
 
    // remove the arguments from the stack and push our result
    stack->setTop(stacktop);
    stack->push(result);
 
    // TODO:  Need to reassess how this final result is traced.
    // trace the array result and return it
    context->traceResult(result);
    return result;
}