opcodes.c

/***************************************************************************
 *  NESHLA: The Nintendo Entertainment System High Level Assembler
 *  Copyright (C) 2003,2004,2005 Brian Provinciano, http://www.bripro.com
 *
 *  This program is free software. 
 *	You may use this code for anything you wish.
 *	It comes with no warranty.
 ***************************************************************************/

/******************************************************************************/
#pragma hdrstop
#include "compiler.h"
/******************************************************************************/
#pragma package(smart_init)                            
/******************************************************************************/
U8 opRelSwap[] = {
	opBPL_REL,opBMI_REL,
	opBVC_REL,opBVS_REL,
	opBCC_REL,opBCS_REL,
	opBNE_REL,opBEQ_REL,
};

OPCODE *activeOpcode,*opcodeSta,*opcodeSty,*opcodeStx; // todo add opcode properties instead for check (ie. OP_STORE)
/******************************************************************************/
void OpcodesInit(char *label)
{
	activeOpcode	= NULL;
  	opcodeSta		= &opcodes[IsOpcodeName("STA")];
  	opcodeSty		= &opcodes[IsOpcodeName("STY")];
  	opcodeStx		= &opcodes[IsOpcodeName("STX")];
}
/******************************************************************************/
int 	FASTCALL IsOpcodeName(char *label)
{
	int i;
    OPCODE *o=opcodes;
	for(i=opTOTAL_UNIQUE-1;i>=0;i--)
    	if(!STRCMP((o++)->name,label))
        	return (opTOTAL_UNIQUE-1)-i;
    return -1;
}
/******************************************************************************/
char *	FASTCALL GetOpcodeName(int code)
{
	int i,j;    
    OPCODE *o=opcodes;
	for(i=opTOTAL_UNIQUE-1;i>=0;i--)
    	for(j=0;j<prtTOTAL;j++)
    		if((o++)->codes[j] == code)
        		return ((o-1))->name;
    return "";
}
/******************************************************************************/
int 	FASTCALL RelSwapOp(int opcode)
{
	int i;
	for(i=7;i>=0;i--)
		if(opRelSwap[i]==opcode) {
    		return opRelSwap[i^1];
		}
    return -1;
}
/******************************************************************************/