view lwasm/insn_inh.c @ 473:8181ddd707f1

Add "nooutput" pragma Add the "nooutput" pragma which causes assembly to proceed as normal for code with the exception that no output is generated for any instructions under this pragma. The current address is increased as usual and the symbol table is still constructed. However, no actual output is generated for lines operating under this pragma.
author William Astle <lost@l-w.ca>
date Thu, 01 Nov 2018 23:07:03 -0600
parents 4fd16faa4d93
children
line wrap: on
line source

/*
insn_inh.c
Copyright © 2010 William Astle

This file is part of LWASM.

LWASM is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.

You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.

*/

#include "lwasm.h"
#include "instab.h"

PARSEFUNC(insn_parse_inh)
{
	l -> len = OPLEN(instab[l -> insn].ops[0]);
	skip_operand(p);
}

EMITFUNC(insn_emit_inh)
{
	lwasm_emitop(l, instab[l -> insn].ops[0]);
}

PARSEFUNC(insn_parse_inh6800)
{
	// there may be two operations here so check for both
	l -> len = OPLEN(instab[l -> insn].ops[0]);
	if (instab[l -> insn].ops[1] >= 0)
		l -> len += OPLEN(instab[l -> insn].ops[1]);
	skip_operand(p);
}

EMITFUNC(insn_emit_inh6800)
{
	// there may be two operations here so check for both
	lwasm_emitop(l, instab[l -> insn].ops[0]);
	if (instab[l -> insn].ops[1] >= 0)
		lwasm_emitop(l, instab[l -> insn].ops[1]);
	l -> cycle_base = instab[l -> insn].ops[3];
}

int negq_ops[] = { 0x10, 0x43, 0x10, 0x53, 0x10, 0x31, 0xc6, 0x10, 0x31, 0xc0 };
#define negq_size (sizeof(negq_ops)/sizeof(int))

PARSEFUNC(insn_parse_conv)
{
	int i;
	l -> len = 0;
	for (i = 0; i <= 2; i++)
	{
		if (instab[l -> insn].ops[i] >= 0)
			l -> len += OPLEN(instab[l -> insn].ops[i]);
	}

	/* negq */
	if (instab[l -> insn].ops[0] == -1)
		l -> len = negq_size;
	skip_operand(p);
}

EMITFUNC(insn_emit_conv)
{
	int i;
	for (i = 0; i <= 2; i++)
	{
		if (instab[l -> insn].ops[i] >= 0)
			lwasm_emitop(l, instab[l -> insn].ops[i]);
	}

	/* special case for negq */
	if (instab[l -> insn].ops[0] == -1)
	{
		// 1043   (2)  comd
		// 1053   (2)  comw
		// 1031C6 (4)  adcr 0,w
		// 1031C0 (4)  adcr 0,d

		for (i = 0; i < negq_size; i++)
			lwasm_emitop(l, negq_ops[i]);
	}

	l->cycle_base = instab[l -> insn].ops[3];
}