#include "factor.h"

F_WORD* word(CELL primitive, CELL parameter, CELL plist)
{
	F_WORD* word = allot_object(WORD_TYPE,sizeof(F_WORD));
	word->hashcode = (CELL)word; /* initial address */
	word->xt = primitive_to_xt(primitive);
	word->primitive = primitive;
	word->parameter = parameter;
	word->plist = plist;
	word->call_count = 0;
	word->allot_count = 0;

	return word;
}

/* When a word is executed we jump to the value of the xt field. However this
   value is an unportable function pointer, so in the image we store a primitive
   number that indexes a list of xts. */
void update_xt(F_WORD* word)
{
	word->xt = primitive_to_xt(word->primitive);
}

/* <word> ( primitive parameter plist -- word ) */
void primitive_word(void)
{
	CELL plist, parameter;
	F_FIXNUM primitive;

	maybe_garbage_collection();

	plist = dpop();
	parameter = dpop();
	primitive = to_fixnum(dpop());
	dpush(tag_word(word(primitive,parameter,plist)));
}

void primitive_word_hashcode(void)
{
	drepl(tag_fixnum(untag_word(dpeek())->hashcode));
}

void primitive_word_xt(void)
{
	drepl(tag_cell(untag_word(dpeek())->xt));
}

void primitive_set_word_xt(void)
{
	F_WORD* word = untag_word(dpop());
	word->xt = unbox_integer();
}

void primitive_word_primitive(void)
{
	drepl(tag_fixnum(untag_word(dpeek())->primitive));
}

void primitive_set_word_primitive(void)
{
	F_WORD* word = untag_word(dpop());
	word->primitive = to_fixnum(dpop());
	update_xt(word);
}

void primitive_word_parameter(void)
{
	drepl(untag_word(dpeek())->parameter);
}

void primitive_set_word_parameter(void)
{
	F_WORD* word = untag_word(dpop());
	word->parameter = dpop();
}

void primitive_word_plist(void)
{
	drepl(untag_word(dpeek())->plist);
}

void primitive_set_word_plist(void)
{
	F_WORD* word = untag_word(dpop());
	word->plist = dpop();
}

void primitive_word_call_count(void)
{
	drepl(tag_cell(untag_word(dpeek())->call_count));
}

void primitive_set_word_call_count(void)
{
	F_WORD* word = untag_word(dpop());
	word->call_count = to_fixnum(dpop());
}

void primitive_word_allot_count(void)
{
	drepl(tag_cell(untag_word(dpeek())->allot_count));
}

void primitive_set_word_allot_count(void)
{
	F_WORD* word = untag_word(dpop());
	word->allot_count = to_fixnum(dpop());
}

void primitive_word_compiledp(void)
{
	F_WORD* word = untag_word(dpop());
	box_boolean(word->xt != (CELL)docol && word->xt != (CELL)dosym);
}

void fixup_word(F_WORD* word)
{
	update_xt(word);
	fixup(&word->parameter);
	fixup(&word->plist);
}

void collect_word(F_WORD* word)
{
	copy_object(&word->parameter);
	copy_object(&word->plist);
}