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/******************************************************************************/
/* REXX Kernel                                        ConstantDirective.cpp   */
/*                                                                            */
/* Primitive Translator Abstract Directive Code                               */
/*                                                                            */
/******************************************************************************/
#include "RexxCore.h"
#include "ConstantDirective.hpp"
#include "Clause.hpp"
#include "RexxActivation.hpp"
#include "CPPCode.hpp"

/**
 * Construct a ConstantDirective.
 *
 * @param n      The name of the requires target.
 * @param p      The public name of the requires target.
 * @param clause The source file clause containing the directive.
 */
ConstantDirective::ConstantDirective(ConstantGetterCode *c, RexxInternalObject *e, RexxClause *clause) : RexxDirective(clause, KEYWORD_CONSTANT)
{
    constantCode = c;
    expression = e;
}


/**
 * Normal garbage collecting live mark.
 *
 * @param liveMark The current live object mark.
 */
void ConstantDirective::live(size_t liveMark)
{
    // must be first object marked
    memory_mark(nextInstruction);
    memory_mark(constantCode);
    memory_mark(expression);
}


/**
 * The generalized object marking routine.
 *
 * @param reason The processing faze we're running the mark on.
 */
void ConstantDirective::liveGeneral(MarkReason reason)
{
    // must be first one marked (though normally null)
    memory_mark_general(nextInstruction);
    memory_mark_general(constantCode);
    memory_mark_general(expression);
}


/**
 * Flatten the directive instance.
 *
 * @param envelope The envelope we're flattening into.
 */
void ConstantDirective::flatten(Envelope *envelope)
{
    setUpFlatten(ConstantDirective)

    flattenRef(nextInstruction);
    flattenRef(constantCode);
    flattenRef(expression);

    cleanUpFlatten
}


/**
 * Allocate a new constant directive.
 *
 * @param size   The size of the object.
 *
 * @return The memory for the new object.
 */
void *ConstantDirective::operator new(size_t size)
{
    return new_object(size, T_ConstantDirective);
}



/**
 * Execute a dynamic ::CONSTANT directive as if it is a real
 * instruction.
 *
 * @param context The current execution context.
 * @param stack   The current evaluation stack.
 */
void ConstantDirective::execute(RexxActivation *context, ExpressionStack *stack )
{
    context->traceInstruction(this);
    // get the expression value
    RexxObject *result = expression->evaluate(context, stack);
    // trace the result
    context->traceResult(result);
    // complete the method for the constant with the resolved value
    constantCode->setValue(result);
    // do debug pause
    context->pauseInstruction();
}