Retro68/gcc/libjava/java/lang/natVMDouble.cc
Wolfgang Thaller aaf905ce07 add gcc 4.70
2012-03-28 01:13:14 +02:00

216 lines
4.0 KiB
C++

// natVMDouble.cc - Implementation of java.lang.VMDouble native methods.
/* Copyright (C) 1998, 1999, 2000, 2001, 2003, 2005, 2006, 2007
Free Software Foundation
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
#include <config.h>
#include <stdlib.h>
#include <gcj/cni.h>
#include <java/lang/String.h>
#include <java/lang/Double.h>
#include <java/lang/VMDouble.h>
#include <java/lang/Character.h>
#include <java/lang/NumberFormatException.h>
#include <jvm.h>
#include <stdio.h>
#include <string.h>
#include "fdlibm.h"
union u
{
jlong l;
jdouble d;
};
jlong
java::lang::VMDouble::doubleToLongBits(jdouble value)
{
union u u;
u.d = value;
jlong e = u.l & 0x7ff0000000000000LL;
jlong f = u.l & 0x000fffffffffffffLL;
if (e == 0x7ff0000000000000LL && f != 0L)
u.l = 0x7ff8000000000000LL;
return u.l;
}
jlong
java::lang::VMDouble::doubleToRawLongBits(jdouble value)
{
union u u;
u.d = value;
return u.l;
}
jdouble
java::lang::VMDouble::longBitsToDouble(jlong bits)
{
union u u;
u.l = bits;
return u.d;
}
jstring
java::lang::VMDouble::toString(jdouble value, jboolean isFloat)
{
if (Double::isNaN (value))
return JvNewStringLatin1 ("NaN", sizeof ("NaN") - 1);
if (value == Double::POSITIVE_INFINITY)
return JvNewStringLatin1 ("Infinity", sizeof ("Infinity") - 1);
if (value == Double::NEGATIVE_INFINITY)
return JvNewStringLatin1 ("-Infinity", sizeof ("-Infinity") - 1);
char buffer[50], result[50];
int decpt, sign;
_dtoa (value, 0, 20, &decpt, &sign, NULL, buffer, (int)isFloat);
value = fabs (value);
char *s = buffer;
char *d = result;
if (sign)
*d++ = '-';
if ((value >= 1e-3 && value < 1e7) || value == 0)
{
if (decpt <= 0)
*d++ = '0';
else
{
for (int i = 0; i < decpt; i++)
if (*s)
*d++ = *s++;
else
*d++ = '0';
}
*d++ = '.';
if (*s == 0)
{
*d++ = '0';
decpt++;
}
while (decpt++ < 0)
*d++ = '0';
while (*s)
*d++ = *s++;
*d = 0;
return JvNewStringLatin1 (result, strlen (result));
}
*d++ = *s++;
decpt--;
*d++ = '.';
if (*s == 0)
*d++ = '0';
while (*s)
*d++ = *s++;
*d++ = 'E';
if (decpt < 0)
{
*d++ = '-';
decpt = -decpt;
}
{
char exp[4];
char *e = exp + sizeof exp;
*--e = 0;
do
{
*--e = '0' + decpt % 10;
decpt /= 10;
}
while (decpt > 0);
while (*e)
*d++ = *e++;
}
*d = 0;
return JvNewStringLatin1 (result, strlen (result));
}
jdouble
java::lang::VMDouble::parseDouble(jstring str)
{
int length = str->length();
while (length > 0
&& Character::isWhitespace(str->charAt(length - 1)))
length--;
// The String could end with a f/F/d/D which is valid but we don't need.
bool saw_trailer = false;
if (length > 0)
{
jchar last = str->charAt(length-1);
if (last == 'f' || last == 'F' || last == 'd' || last == 'D')
{
length--;
saw_trailer = true;
}
}
jsize start = 0;
while (length > 0
&& Character::isWhitespace(str->charAt(start)))
start++, length--;
if (length > 0)
{
// Note that UTF can expand 3x.
char *data = (char *) __builtin_alloca (3 * length + 1);
jsize blength = _Jv_GetStringUTFRegion (str, start, length, data);
data[blength] = 0;
if (! saw_trailer)
{
if (! strcmp (data, "NaN") || ! strcmp (data, "+NaN")
|| ! strcmp (data, "-NaN"))
return Double::NaN;
else if (! strcmp (data, "Infinity") || ! strcmp (data, "+Infinity"))
return Double::POSITIVE_INFINITY;
else if (! strcmp (data, "-Infinity"))
return Double::NEGATIVE_INFINITY;
}
struct _Jv_reent reent;
memset (&reent, 0, sizeof reent);
char *endptr;
double val = _strtod_r (&reent, data, &endptr);
if (endptr == data + blength)
return val;
}
throw new NumberFormatException(str);
}