/* $Id$ */
/*
 * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
 * See the copyright notice in the ACK home directory, in the file "Copyright".
 */
/* @(#)comm7.c	1.10 */
/*
 * miscellaneous
 */

#include <errno.h>
#include "comm0.h"
#include "comm1.h"
#include "y.tab.h"
#include <stdarg.h>
#include "object.h"

valu_t load(const item_t* ip)
{
#ifdef ASLD
	int typ;

	typ = ip->i_type & S_TYP;
	if ((typ -= S_MIN) < 0) /* S_UND or S_ABS */
		return (ip->i_valu);
	return (ip->i_valu + sect[typ].s_base);
#else
	if ((ip->i_type & S_TYP) == S_UND || (ip->i_type & S_COM))
	{
		if (pass == PASS_3)
		{
			if (relonami != 0)
				serror("relocation error (relonami=%d, type=%08x)", relonami, ip->i_type);
			relonami = ip->i_valu + 1;
		}
		return (0);
	}
	return (ip->i_valu);
#endif
}

int store(item_t* ip, valu_t val)
{
#ifdef ASLD
	int typ;

	typ = ip->i_type & S_TYP;
	if ((typ -= S_MIN) >= 0)
		val -= sect[typ].s_base;
#else
	if ((ip->i_type & S_TYP) == S_UND)
		return (0);
#endif
	assert(pass != PASS_3 || (ip->i_type & S_VAR) || ip->i_valu == val);
	ip->i_valu = val;
	return (1);
}

char* remember(char* s)
{
	char* p;
	int n;
	static int nleft = 0;
	static char* next;

	p = s;
	n = 0;
	do
		n++;
	while (*p++);
	if ((nleft -= n) < 0)
	{
		next = malloc(MEMINCR);
		if (next == 0)
			fatal("out of memory");
		nleft = (MEMINCR / sizeof(char)) - n;
		assert(nleft >= 0);
	}
	p = next;
	while ((*p++ = *s++))
		;
	s = next;
	next = p;
	return (s);
}

int combine(int typ1, int typ2, int op)
{
	switch (op)
	{
		case '+':
			if (typ1 == S_ABS)
				return (typ2);
			if (typ2 == S_ABS)
				return (typ1);
			break;
		case '-':
			if (typ2 == S_ABS)
				return (typ1);
			if ((typ1 & ~S_DOT) == (typ2 & ~S_DOT) && typ1 != S_UND)
				return (S_ABS | S_VAR);
			break;
		case '>':
			if (typ1 == S_ABS && typ2 == S_ABS)
				return (S_ABS);
			if (((typ1 & ~S_DOT) == (typ2 & ~S_DOT) && typ1 != S_UND) || (typ1 == S_ABS)
			    || (typ2 == S_ABS))
				return (S_ABS | S_VAR);
			break;
		default:
			if (typ1 == S_ABS && typ2 == S_ABS)
				return (S_ABS);
			break;
	}
	if (pass != PASS_1)
		serror("illegal operator");
	return (S_UND);
}

#ifdef LISTING
int printx(int ndig, valu_t val)
{
	static char buf[8];
	char* p;
	int c, n;

	p = buf;
	n = ndig;
	do
	{
		*p++ = (int)val & 017;
		val >>= 4;
	} while (--n);
	do
	{
		c = "0123456789ABCDEF"[(unsigned char)*--p];
		putchar(c);
	} while (p > buf);
	return (ndig);
}

void listline(int textline)
{
	int c;

	if ((listflag & 4) && (c = getc(listfile)) != '\n' && textline)
	{
		if (listcolm >= 24)
			printf(" \\\n\t\t\t");
		else
			do
			{
				putchar('\t');
				listcolm += 8;
			} while (listcolm < 24);
		do
		{
			assert(c != EOF);
			putchar(c);
		} while ((c = getc(listfile)) != '\n');
	}
	if (listflag & 7)
	{
		putchar('\n');
		fflush(stdout);
	}
	listeoln = 1;
	listcolm = 0;
	listflag = listtemp;
}
#endif /* LISTING */

/* ---------- code optimization ---------- */

#ifdef THREE_PASS
#define PBITTABSZ 128
static char* pbittab[PBITTABSZ];

int small(int fitsmall, int gain)
{
	int bit;
	char* p;

	if (DOTSCT == NULL)
		nosect();
	if (bflag)
		return (0);
	if (nbits == BITCHUNK)
	{
		bitindex++;
		nbits = 0;
		if (bitindex == PBITTABSZ)
		{
			static int w_given;
			if (pass == PASS_1 && !w_given)
			{
				w_given = 1;
				warning("bit table overflow");
			}
			return (0);
		}
		if (pbittab[bitindex] == 0 && pass == PASS_1)
		{
			if ((pbittab[bitindex] = calloc(MEMINCR, 1)) == 0)
			{
				static int w2_given;

				if (!w2_given)
				{
					w2_given = 1;
					warning("out of space for bit table");
				}
			}
		}
		if (pbittab[bitindex] == 0)
			return (0);
	}
	bit = 1 << (nbits & 7);
	p = pbittab[bitindex] + (nbits >> 3);
	nbits++;
	switch (pass)
	{
		case PASS_1:
			return (0);
		case PASS_2:
			if (fitsmall)
			{
				DOTGAIN += gain;
				*p |= bit;
			}
			return (fitsmall);
		case PASS_3:
			assert(fitsmall || (*p & bit) == 0);
			return (*p & bit);
		default:
			assert(0);
	}
	/*NOTREACHED*/
}
#endif

/* ---------- output ---------- */

void emit1(int arg)
{
	static int olddottyp = -1;
#ifdef LISTING
	if (listeoln)
	{
		if (listflag & 1)
		{
			listcolm += printx(VALWIDTH, (valu_t)DOTVAL);
			listcolm++;
			putchar(' ');
		}
		listeoln = 0;
	}
	if (listflag & 2)
		listcolm += printx(2, (valu_t)arg);
#endif
	switch (pass)
	{
		case PASS_1:
			if (DOTSCT == NULL)
				nosect();
			/* no break */
		case PASS_2:
			DOTSCT->s_zero = 0;
			break;
		case PASS_3:
			if (DOTTYP != olddottyp)
			{
				wr_outsect(DOTTYP - S_MIN);
				olddottyp = DOTTYP;
			}
			while (DOTSCT->s_zero)
			{
				wr_putc(0);
				DOTSCT->s_zero--;
			}
			wr_putc(arg);
			break;
	}
	DOTVAL++;
}

void emit2(int arg)
{
#ifdef BYTES_REVERSED
	emit1((arg >> 8));
	emit1(arg);
#else
	emit1(arg);
	emit1((arg >> 8));
#endif
}

void emit4(long arg)
{
#ifdef WORDS_REVERSED
	emit2((int)(arg >> 16));
	emit2((int)(arg));
#else
	emit2((int)(arg));
	emit2((int)(arg >> 16));
#endif
}

void emitx(valu_t val, int n)
{
	switch (n)
	{
		case RELO1:
			emit1((int)val);
			break;
		case RELO2:
#ifdef BYTES_REVERSED
			emit1(((int)val >> 8));
			emit1((int)val);
#else
			emit1((int)val);
			emit1(((int)val >> 8));
#endif
			break;
		case RELO4:
#ifdef WORDS_REVERSED
			emit2((int)(val >> 16));
			emit2((int)(val));
#else
			emit2((int)(val));
			emit2((int)(val >> 16));
#endif
			break;
		default:
			assert(0);
	}
}

void emitstr(int zero)
{
	int i;
	char* p;

	p = stringbuf;
	i = stringlen;
	while (--i >= 0)
		emit1(*p++);
	if (zero)
		emit1(0);
}

#define CODE_EXPANDER

#if !defined IEEEFLOAT && !defined PDPFLOAT
	#define IEEEFLOAT
#endif

#if defined WORDS_REVERSED
	#define FL_MSL_AT_LOW_ADDRESS 1
	#define FL_MSW_AT_LOW_ADDRESS 1
#else
	#define FL_MSL_AT_LOW_ADDRESS 0
	#define FL_MSW_AT_LOW_ADDRESS 0
#endif

#if defined BYTES_REVERSED
	#define FL_MSB_AT_LOW_ADDRESS 1
#else
	#define FL_MSB_AT_LOW_ADDRESS 0
#endif

#define gen1 emit1
#include "con_float"

void emitf(int size, int negative)
{
	char buffer[40];

	if (stringlen > sizeof(buffer)-1)
		fatal("floating point constant too long");

	if (negative)
	{
		buffer[0] = '-';
		strcpy(buffer+1, stringbuf);
		con_float(buffer, size);
	}
	else
		con_float(stringbuf, size);
}

/* ---------- Error handling ---------- */

/* ARGSUSED */
void yyerror(const char* message)
{
} /* we will do our own error printing */

void nosect(void)
{
	fatal("no sections");
}

void wr_fatal(void)
{
	fatal("write error");
}

static void diag(const char* tail, const char* s, va_list ap)
{
	fflush(stdout);
	if (modulename)
		fprintf(stderr, "\"%s\", line %ld: ", modulename, lineno);
	else
		fprintf(stderr, "%s: ", progname);
	vfprintf(stderr, s, ap);
	fprintf(stderr, "%s", tail);
}

/* VARARGS1 */
void fatal(const char* s, ...)
{
	va_list ap;
	va_start(ap, s);

	nerrors++;
	diag(" (fatal)\n", s, ap);
	stop();

	va_end(ap);
}

/* VARARGS1 */
void serror(const char* s, ...)
{
	va_list ap;
	va_start(ap, s);

	nerrors++;
	diag("\n", s, ap);
	stop();

	va_end(ap);
}

/* VARARGS1 */
void warning(const char* s, ...)
{
	va_list ap;
	va_start(ap, s);

	nerrors++;
	diag(" (warning)\n", s, ap);
	stop();

	va_end(ap);
}

void nofit(void)
{
	if (pass == PASS_3)
		warning("too big");
}