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/* parce.c -- Architecture independent load and parsing of assembly
   Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
 
This file is part of OpenRISC 1000 Architectural Simulator.
 
This program 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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
 
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
 
#include "parse.h"
#include "abstract.h"
 
#define MAXLINE_LEN	18000
 
/* Unused mem memory marker. It is used when allocating program and data memory
   during parsing */
unsigned int freemem;
 
int nonempty(char *line)
{
	int i;
 
	for(i = 0; i < strlen(line); i++)
		if (!isspace(line[i]))
			return(1);
	return(0);
}
 
int nondigit(char *line)
{
	int i;
 
	for(i = 0; i < strlen(line); i++)
		if (!isdigit(line[i]))
			return(1);
	return(0);
}
 
char *strtoken(char *in, char *out, int which)
{
	char	*super;
	char	*sub;
	char	*newline;
 
	super = strdup(in);
	sub = strtok(super, " \t");
	while (sub && --which)
		sub = strtok(NULL, " \t");
	if (sub && !which) {
		if ((newline = strchr(sub, '\n')))
			newline[0] = '\0';
		strcpy(out, sub);
	} else
		out[0] = '\0';
	free(super);
	if ((newline = strchr(out, '\r')))	/* get rid of CR */
		newline[0] = '\0';
	return(out);
}
 
void adddatastr(char *str)
{
	if (str)
		str++;
	else
		return;
 
	for(; *str && *str != '\"'; str++, freemem++)
		if (*str == '\\')
			switch (*++str) {
				case 'n': mem[freemem].data = '\n';
					break;
				case 't': mem[freemem].data = '\t';
					break;
				case 'r': mem[freemem].data = '\r';
					break;
				case '0': mem[freemem].data = '\0';
					break;
				default: break;
			}
		else
			mem[freemem].data = *str;
}
 
void adddataword(char *num)
{
	mem[freemem].data = (char) (atol(num) >> 24);
	mem[freemem + 1].data = (char) (atol(num) >> 16);
	mem[freemem + 2].data = (char) (atol(num) >> 8);
	mem[freemem + 3].data = (char) (atol(num));
 
	freemem += 4;
}
 
void adddatahalf(char *num)
{
	mem[freemem].data = (char) (atol(num) >> 8);
	mem[freemem + 1].data = (char) (atol(num));
 
	freemem += 2;
}
 
void adddatabyte(char *num)
{
	mem[freemem].data = (char) (atol(num));
 
	freemem++;
}
 
void adddataspace(char *num)
{
	freemem += atol(num);
}
 
void addlabel(char *label)
{
	if (strstr(label, LABELEND_CHAR)) {
		*strstr(label, LABELEND_CHAR) = '\0';
	       	strcpy(mem[freemem].label, label);
	}
 
        return;
}
 
void addprogram(char *insn, char *operands)
{
 
        strcpy(mem[freemem].insn, insn);
 
	/* op1 */
	if (*operands)
	        strcpy(mem[freemem].op1, operands);
	if (strstr(mem[freemem].op1, OPERAND_DELIM)) {
		operands = strstr(mem[freemem].op1, OPERAND_DELIM);
		*operands = '\0';
		operands++;
	} else {
		freemem += 4;
		return;
	}
 
	/* op2 */
	if (*operands)
	        strcpy(mem[freemem].op2, operands);
	if (strstr(mem[freemem].op2, OPERAND_DELIM)) {
		operands = strstr(mem[freemem].op2, OPERAND_DELIM);
		*operands = '\0';
		operands++;
	} else {
		freemem += 4;
		return;
	}
 
	/* op3 */
	if (*operands)
	        strcpy(mem[freemem].op3, operands);
	if (strstr(mem[freemem].op3, OPERAND_DELIM)) {
		operands = strstr(mem[freemem].op3, OPERAND_DELIM);
		*operands = '\0';
		operands++;
	} else {
		freemem += 4;
		return;
	}
 
	/* op4 */
	if (*operands)
	        strcpy(mem[freemem].op4, operands);
	if (strstr(mem[freemem].op4, OPERAND_DELIM)) {
		operands = strstr(mem[freemem].op4, OPERAND_DELIM);
		*operands = '\0';
		operands++;
	}
 
	freemem += 4;
        return;
}
 
/* Non-architecture dependent parsing: stripping comments, filling
   abstract memory */
 
void parseline(char *inputline)
{
	char item[MAXLINE_LEN];
	char item2[MAXLINE_LEN];
	int  i = 0;
 
	/* Strip comments: simply terminate line where
	   the first comment character appears. */
 
	debug("PARSING: %s", inputline);
	while (inputline[i] != '\0')
		if (inputline[i] == COMMENT_CHAR) {
			inputline[i] = '\0';
			break;
		} else
			i++;
 
	/* Get the first item from this line */
	strtoken(inputline, item, 1);
	strtoken(inputline, item2, 2);
 
	/* Is this item empty? Nothing to process, so return. */
	if (strlen(item) == 0)
		return;
 
	/* Is this item a label? If yes, add it to the label
	   table and return immediately. */
	if (strstr(item, LABELEND_CHAR)) {
		addlabel(item);
		return;
	}
 
	/* Is this item a .directive? If yes, check for some supported
	   and then return (even if unsupported found). */
	if (item[0] == DIRECTIVE_CHAR) {
		if ((strcmp(item, ".align") == 0) && (freemem % 4)) {
			freemem &= -4;	/* e.g. 0xfffffffc */
			freemem += 4;	/* always align to word */
			return;
		} else 
		if (strcmp(item, ".ascii") == 0) {
			adddatastr(strstr(inputline, "\""));
			return;
		} else 
		if (strcmp(item, ".word") == 0) {
			adddataword(item2);
			return;
		} else 
		if (strcmp(item, ".half") == 0) {
			adddatahalf(item2);
			return;
		} else 
		if (strcmp(item, ".byte") == 0) {
			adddatabyte(item2);
			return;
		} else 
		if (strcmp(item, ".space") == 0) {
			adddataspace(item2);
			return;
		} else	/* .directive but not one of the supported */
			return;
	}
 
	/* This item can only be an instruction. Get all operands
	   and add everything to mem array but as a program. */
	addprogram(item, item2);
 
	/* Also do static, single stats. */
	addsstats(item, 0, 1);
 
	return;
 
}
 
/* Load file and hand over every line to parse routine. */
 
void readfile(char *filename)
{
	FILE *inputfs;
	char  inputbuf[MAXLINE_LEN];
	char  *status;
 
	if ((inputfs = fopen(filename, "r"))) {
		while ((status = fgets(inputbuf, sizeof(inputbuf), inputfs))) {
			if (nonempty(inputbuf))
				parseline(inputbuf);
		}
		fclose(inputfs);
	}
	else
		perror("readfile");
 
	return;
}
 
 
void loadcode(char *filename)
{
	freemem = 0;
	memset(mem, 0, sizeof(mem));
	readfile(filename);
	return;
}