jruby/src/org/jruby/RubyBignum.java at parallel_boot · MSNexploder/jruby · GitHub

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/***** BEGIN LICENSE BLOCK *****

* Version: EPL 1.0/GPL 2.0/LGPL 2.1

* The contents of this file are subject to the Eclipse Public

* License Version 1.0 (the "License"); you may not use this file

* except in compliance with the License. You may obtain a copy of

* the License at http://www.eclipse.org/legal/epl-v10.html

* Software distributed under the License is distributed on an "AS

* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or

* implied. See the License for the specific language governing

* rights and limitations under the License.

* Alternatively, the contents of this file may be used under the terms of

* either of the GNU General Public License Version 2 or later (the "GPL"),

* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),

* in which case the provisions of the GPL or the LGPL are applicable instead

* of those above. If you wish to allow use of your version of this file only

* under the terms of either the GPL or the LGPL, and not to allow others to

* use your version of this file under the terms of the EPL, indicate your

* decision by deleting the provisions above and replace them with the notice

* and other provisions required by the GPL or the LGPL. If you do not delete

* the provisions above, a recipient may use your version of this file under

* the terms of any one of the EPL, the GPL or the LGPL.

***** END LICENSE BLOCK *****/

package org.jruby;

import java.io.IOException;

import java.math.BigDecimal;

import java.math.BigInteger;

import org.jruby.anno.JRubyClass;

import org.jruby.anno.JRubyMethod;

import org.jruby.common.IRubyWarnings.ID;

import org.jruby.runtime.ClassIndex;

import org.jruby.runtime.ObjectAllocator;

import org.jruby.runtime.ThreadContext;

import org.jruby.runtime.builtin.IRubyObject;

import org.jruby.runtime.marshal.MarshalStream;

import org.jruby.runtime.marshal.UnmarshalStream;

import static org.jruby.CompatVersion.*;

/**

* @author jpetersen

@JRubyClass(name="Bignum", parent="Integer")

public class RubyBignum extends RubyInteger {

public static RubyClass createBignumClass(Ruby runtime) {

RubyClass bignum = runtime.defineClass("Bignum", runtime.getInteger(),

ObjectAllocator.NOT_ALLOCATABLE_ALLOCATOR);

runtime.setBignum(bignum);

bignum.index = ClassIndex.BIGNUM;

bignum.setReifiedClass(RubyBignum.class);

bignum.defineAnnotatedMethods(RubyBignum.class);

return bignum;

}

private static final int BIT_SIZE = 64;

private static final long MAX = (1L << (BIT_SIZE - 1)) - 1;

public static final BigInteger LONG_MAX = BigInteger.valueOf(MAX);

public static final BigInteger LONG_MIN = BigInteger.valueOf(-MAX - 1);

public static final BigInteger ULONG_MAX = BigInteger.valueOf(1).shiftLeft(BIT_SIZE).subtract(BigInteger.valueOf(1));

private final BigInteger value;

public RubyBignum(Ruby runtime, BigInteger value) {

super(runtime, runtime.getBignum());

this.value = value;

}

@Override

public int getNativeTypeIndex() {

return ClassIndex.BIGNUM;

}

@Override

public Class<?> getJavaClass() {

return BigInteger.class;

}

public static RubyBignum newBignum(Ruby runtime, long value) {

return newBignum(runtime, BigInteger.valueOf(value));

}

public static RubyBignum newBignum(Ruby runtime, double value) {

return newBignum(runtime, new BigDecimal(value).toBigInteger());

}

public static RubyBignum newBignum(Ruby runtime, BigInteger value) {

return new RubyBignum(runtime, value);

}

public static RubyBignum newBignum(Ruby runtime, String value) {

return new RubyBignum(runtime, new BigInteger(value));

}

@Override

public double getDoubleValue() {

return big2dbl(this);

}

@Override

public long getLongValue() {

return big2long(this);

}

@Override

public BigInteger getBigIntegerValue() {

return value;

}

/** Getter for property value.

* @return Value of property value.

public BigInteger getValue() {

return value;

}

/* ================

* Utility Methods

* ================

/* If the value will fit in a Fixnum, return one of those. */

/** rb_big_norm

public static RubyInteger bignorm(Ruby runtime, BigInteger bi) {

if (bi.compareTo(LONG_MIN) < 0 || bi.compareTo(LONG_MAX) > 0) {

return newBignum(runtime, bi);

}

return runtime.newFixnum(bi.longValue());

}

/** rb_big2long

public static long big2long(RubyBignum value) {

BigInteger big = value.getValue();

if (big.compareTo(LONG_MIN) < 0 || big.compareTo(LONG_MAX) > 0) {

throw value.getRuntime().newRangeError("bignum too big to convert into `long'");

}

return big.longValue();

}

/** rb_big2ulong

* This is here because for C extensions ulong can hold different values without throwing a RangeError

public static long big2ulong(RubyBignum value) {

BigInteger big = value.getValue();

if (big.compareTo(LONG_MIN) <= 0 || big.compareTo(ULONG_MAX) > 0) {

throw value.getRuntime().newRangeError("bignum too big to convert into `ulong'");

}

return value.getValue().longValue();

}

/** rb_big2dbl

public static double big2dbl(RubyBignum value) {

BigInteger big = value.getValue();

double dbl = convertToDouble(big);

if (dbl == Double.NEGATIVE_INFINITY || dbl == Double.POSITIVE_INFINITY) {

value.getRuntime().getWarnings().warn(ID.BIGNUM_FROM_FLOAT_RANGE, "Bignum out of Float range");

}

return dbl;

}

private IRubyObject checkShiftDown(RubyBignum other) {

if (other.value.signum() == 0) return RubyFixnum.zero(getRuntime());

if (value.compareTo(LONG_MIN) < 0 || value.compareTo(LONG_MAX) > 0) {

return other.value.signum() >= 0 ? RubyFixnum.zero(getRuntime()) : RubyFixnum.minus_one(getRuntime());

}

return getRuntime().getNil();

}

/**

* BigInteger#doubleValue is _really_ slow currently.

* This is faster, and mostly correct (?)

static double convertToDouble(BigInteger bigint) {

long signum = (bigint.signum() == -1) ? 1l << 63 : 0;

bigint = bigint.abs();

int len = bigint.bitLength();

if (len == 0) return 0d;

long exp = len + 1022; // 1023 (bias) - 1 (sign)

long frac = 0;

if (exp > 0x7ff) exp = 0x7ff; // inf, frac = 0;

else {

// Deep breath...

// Shift bigint to get 52 significant bits, adjusting for sign bit

// (-52 -1), but * 2, add 1, then / 2 to round correctly

frac = ((bigint.shiftRight(len - 54).longValue() + 1l) >> 1);

if (frac == 0x20000000000000l) { // corner case: rounding overflowed

exp += 1l;

if (exp > 0x7ff) exp = 0x7ff;

}

return Double.longBitsToDouble(signum | (exp << 52) | frac & 0xfffffffffffffl);

}

/** rb_int2big

public static BigInteger fix2big(RubyFixnum arg) {

return long2big(arg.getLongValue());

}

public static BigInteger long2big(long arg) {

return BigInteger.valueOf(arg);

}

/* ================

* Instance Methods

* ================

/** rb_big_to_s

public IRubyObject to_s(IRubyObject[] args) {

switch (args.length) {

case 0:

return to_s();

case 1:

return to_s(args[0]);

default:

throw getRuntime().newArgumentError(args.length, 1);

}

@JRubyMethod(name = "to_s")

@Override

public IRubyObject to_s() {

int base = 10;

return getRuntime().newString(getValue().toString(base));

}

@JRubyMethod(name = "to_s")

public IRubyObject to_s(IRubyObject arg0) {

int base = num2int(arg0);

if (base < 2 || base > 36) {

throw getRuntime().newArgumentError("illegal radix " + base);

}

return getRuntime().newString(getValue().toString(base));

}

/** rb_big_coerce

@JRubyMethod(name = "coerce", required = 1)

@Override

public IRubyObject coerce(IRubyObject other) {

if (other instanceof RubyFixnum) {

return getRuntime().newArray(newBignum(getRuntime(), ((RubyFixnum) other).getLongValue()), this);

} else if (other instanceof RubyBignum) {

return getRuntime().newArray(newBignum(getRuntime(), ((RubyBignum) other).getValue()), this);

}

throw getRuntime().newTypeError("Can't coerce " + other.getMetaClass().getName() + " to Bignum");

}

/** rb_big_uminus

@JRubyMethod(name = "-@")

public IRubyObject op_uminus() {

return bignorm(getRuntime(), value.negate());

}

/** rb_big_plus

@JRubyMethod(name = "+", required = 1)

public IRubyObject op_plus(ThreadContext context, IRubyObject other) {

if (other instanceof RubyFixnum) {

return addFixnum(((RubyFixnum)other).getLongValue());

} else if (other instanceof RubyBignum) {

return addBignum(((RubyBignum)other).value);

} else if (other instanceof RubyFloat) {

return addFloat((RubyFloat)other);

}

return addOther(context, other);

}

public IRubyObject op_plus(ThreadContext context, long other) {

return addFixnum(other);

}

private IRubyObject addFixnum(long other) {

BigInteger result = value.add(BigInteger.valueOf(other));

if (other > 0 && value.signum() > 0) return new RubyBignum(getRuntime(), result);

return bignorm(getRuntime(), result);

}

private IRubyObject addBignum(BigInteger other) {

BigInteger result = value.add(other);

if (value.signum() > 0 && other.signum() > 0) return new RubyBignum(getRuntime(), result);

return bignorm(getRuntime(), result);

}

private IRubyObject addFloat(RubyFloat other) {

return RubyFloat.newFloat(getRuntime(), big2dbl(this) + other.getDoubleValue());

}

private IRubyObject addOther(ThreadContext context, IRubyObject other) {

return coerceBin(context, "+", other);

}

/** rb_big_minus

@JRubyMethod(name = "-", required = 1)

public IRubyObject op_minus(ThreadContext context, IRubyObject other) {

if (other instanceof RubyFixnum) {

return subtractFixnum(((RubyFixnum)other).getLongValue());

} else if (other instanceof RubyBignum) {

return subtractBignum(((RubyBignum)other).value);

} else if (other instanceof RubyFloat) {

return subtractFloat((RubyFloat)other);

}

return subtractOther(context, other);

}

public IRubyObject op_minus(ThreadContext context, long other) {

return subtractFixnum(other);

}

private IRubyObject subtractFixnum(long other) {

BigInteger result = value.subtract(BigInteger.valueOf(other));

if (value.signum() < 0 && other > 0) return new RubyBignum(getRuntime(), result);

return bignorm(getRuntime(), result);

}

private IRubyObject subtractBignum(BigInteger other) {

BigInteger result = value.subtract(other);

if (value.signum() < 0 && other.signum() > 0) return new RubyBignum(getRuntime(), result);

return bignorm(getRuntime(), result);

}

private IRubyObject subtractFloat(RubyFloat other) {

return RubyFloat.newFloat(getRuntime(), big2dbl(this) - other.getDoubleValue());

}

private IRubyObject subtractOther(ThreadContext context, IRubyObject other) {

return coerceBin(context, "-", other);

}

/** rb_big_mul

@JRubyMethod(name = "*", required = 1)

public IRubyObject op_mul(ThreadContext context, IRubyObject other) {

Ruby runtime = context.runtime;

if (other instanceof RubyFixnum) {

BigInteger result = value.multiply(fix2big(((RubyFixnum) other)));

return result.signum() == 0 ? RubyFixnum.zero(runtime) : new RubyBignum(runtime, result);

}

if (other instanceof RubyBignum) {

BigInteger result = value.multiply(((RubyBignum)other).value);

return result.signum() == 0 ? RubyFixnum.zero(runtime) : new RubyBignum(runtime, result);

} else return opMulOther(context, other);

}

@JRubyMethod(name = "*", required = 1, compat = RUBY1_9)

public IRubyObject op_mul19(ThreadContext context, IRubyObject other) {

Ruby runtime = context.runtime;

BigInteger result;

if (other instanceof RubyFixnum) {

return bignorm(runtime, value.multiply(fix2big(((RubyFixnum) other))));

} else if (other instanceof RubyBignum) {

return bignorm(runtime, value.multiply(((RubyBignum)other).value));

} else return opMulOther(context, other);

}

public IRubyObject op_mul(ThreadContext context, long other) {

Ruby runtime = context.runtime;

BigInteger result = value.multiply(long2big(other));

return result.signum() == 0 ? RubyFixnum.zero(runtime) : new RubyBignum(runtime, result);

}

public IRubyObject opMulOther(ThreadContext context, IRubyObject other) {

if (other instanceof RubyFloat) {

return RubyFloat.newFloat(getRuntime(), big2dbl(this) * ((RubyFloat) other).getDoubleValue());

}

return coerceBin(context, "*", other);

}

/**

* rb_big_divide. Shared part for both "/" and "div" operations.

private IRubyObject op_divide(ThreadContext context, IRubyObject other, boolean slash) {

Ruby runtime = context.runtime;

final BigInteger otherValue;

if (other instanceof RubyFixnum) {

otherValue = fix2big((RubyFixnum) other);

} else if (other instanceof RubyBignum) {

otherValue = ((RubyBignum) other).value;

} else if (other instanceof RubyFloat) {

double otherFloatValue = ((RubyFloat) other).getDoubleValue();

if (runtime.is2_0()) {

if (otherFloatValue == 0.0) throw runtime.newZeroDivisionError();

}

double div = big2dbl(this) / otherFloatValue;

if (slash) {

return RubyFloat.newFloat(runtime, div);

} else {

return RubyNumeric.dbl2num(runtime, div);

}

} else {

return coerceBin(context, slash ? "/" : "div", other);

}

if (otherValue.signum() == 0) throw runtime.newZeroDivisionError();

final BigInteger result;

if (value.signum() * otherValue.signum() == -1) {

BigInteger[] results = value.divideAndRemainder(otherValue);

result = results[1].signum() != 0 ? results[0].subtract(BigInteger.ONE) : results[0];

} else {

result = value.divide(otherValue);

}

return bignorm(getRuntime(), result);

}

/** rb_big_div

@JRubyMethod(name = {"/"}, required = 1)

public IRubyObject op_div(ThreadContext context, IRubyObject other) {

return op_divide(context, other, true);

}

/** rb_big_idiv

@JRubyMethod(name = {"div"}, required = 1)

public IRubyObject op_idiv(ThreadContext context, IRubyObject other) {

return op_divide(context, other, false);

}

/** rb_big_divmod

@JRubyMethod(name = "divmod", required = 1, compat = RUBY1_8)

@Override

public IRubyObject divmod(ThreadContext context, IRubyObject other) {

Ruby runtime = context.runtime;

final BigInteger otherValue;

if (other instanceof RubyFixnum) {

otherValue = fix2big((RubyFixnum) other);

} else if (other instanceof RubyBignum) {

otherValue = ((RubyBignum) other).value;

} else {

return coerceBin(context, "divmod", other);

}

if (otherValue.signum() == 0) throw runtime.newZeroDivisionError();

BigInteger[] results = value.divideAndRemainder(otherValue);

if ((value.signum() * otherValue.signum()) == -1 && results[1].signum() != 0) {

results[0] = results[0].subtract(BigInteger.ONE);

results[1] = otherValue.add(results[1]);

}

return RubyArray.newArray(runtime, bignorm(runtime, results[0]), bignorm(runtime, results[1]));

}

@JRubyMethod(name = "divmod", required = 1, compat = RUBY1_9)

public IRubyObject divmod19(ThreadContext context, IRubyObject other) {

if (!other.isNil() && other instanceof RubyFloat

&& ((RubyFloat)other).getDoubleValue() == 0) {

throw context.runtime.newZeroDivisionError();

}

return divmod(context, other);

}

/** rb_big_modulo

@JRubyMethod(name = {"%", "modulo"}, required = 1, compat = RUBY1_8)

public IRubyObject op_mod(ThreadContext context, IRubyObject other) {

final BigInteger otherValue;

if (other instanceof RubyFixnum) {

otherValue = fix2big((RubyFixnum) other);

} else if (other instanceof RubyBignum) {

otherValue = ((RubyBignum) other).value;

} else {

return coerceBin(context, "%", other);

}

Ruby runtime = context.runtime;

if (otherValue.signum() == 0) throw runtime.newZeroDivisionError();

BigInteger result = value.mod(otherValue.abs());

if (otherValue.signum() == -1 && result.signum() != 0) result = otherValue.add(result);

return bignorm(runtime, result);

}

/** rb_big_modulo

@JRubyMethod(name = {"%", "modulo"}, required = 1, compat = RUBY1_9)

public IRubyObject op_mod19(ThreadContext context, IRubyObject other) {

if (!other.isNil() && other instanceof RubyFloat

&& ((RubyFloat)other).getDoubleValue() == 0) {

throw context.runtime.newZeroDivisionError();

}

return op_mod(context, other);

}

/** rb_big_remainder

@JRubyMethod(name = "remainder", required = 1, compat = RUBY1_8)

@Override

public IRubyObject remainder(ThreadContext context, IRubyObject other) {

final BigInteger otherValue;

if (other instanceof RubyFixnum) {

otherValue = fix2big(((RubyFixnum) other));

} else if (other instanceof RubyBignum) {

otherValue = ((RubyBignum) other).value;

} else {

return coerceBin(context, "remainder", other);

}

Ruby runtime = context.runtime;

if (otherValue.signum() == 0) throw runtime.newZeroDivisionError();

return bignorm(runtime, value.remainder(otherValue));

}

@JRubyMethod(name = "remainder", required = 1, compat = RUBY1_9)

public IRubyObject remainder19(ThreadContext context, IRubyObject other) {

if (other instanceof RubyFloat && ((RubyFloat) other).getDoubleValue() == 0) {

throw context.runtime.newZeroDivisionError();

}

return remainder(context, other);

}

/** rb_big_quo

@JRubyMethod(name = "quo", required = 1, compat = RUBY1_8)

@Override

public IRubyObject quo(ThreadContext context, IRubyObject other) {

if (other instanceof RubyNumeric) {

return RubyFloat.newFloat(getRuntime(), big2dbl(this) / ((RubyNumeric) other).getDoubleValue());

} else {

return coerceBin(context, "quo", other);

}

@JRubyMethod(name = "quo", required = 1, compat = RUBY1_9)

public IRubyObject quo19(ThreadContext context, IRubyObject other) {

if (other instanceof RubyInteger && ((RubyInteger) other).getDoubleValue() == 0) {

throw context.runtime.newZeroDivisionError();

}

return quo(context, other);

}

/** rb_big_pow

@JRubyMethod(name = {"**", "power"}, required = 1)

public IRubyObject op_pow(ThreadContext context, IRubyObject other) {

double d;

if (other instanceof RubyFixnum) {

RubyFixnum fix = (RubyFixnum) other;

long fixValue = fix.getLongValue();

return op_pow(context, fixValue);

} else if (other instanceof RubyBignum) {

d = ((RubyBignum) other).getDoubleValue();

getRuntime().getWarnings().warn(ID.MAY_BE_TOO_BIG, "in a**b, b may be too big");

} else if (other instanceof RubyFloat) {

d = ((RubyFloat) other).getDoubleValue();

} else {

return coerceBin(context, "**", other);

}

return RubyFloat.newFloat(getRuntime(), Math.pow(big2dbl(this), d));

}

public IRubyObject op_pow(ThreadContext context, long other) {

// MRI issuses warning here on (RBIGNUM(x)->len * SIZEOF_BDIGITS * yy > 1024*1024)

if (((value.bitLength() + 7) / 8) * 4 * Math.abs(other) > 1024 * 1024) {

getRuntime().getWarnings().warn(ID.MAY_BE_TOO_BIG, "in a**b, b may be too big");

}

if (other >= 0) {

return bignorm(getRuntime(), value.pow((int) other)); // num2int is also implemented

} else {

return RubyFloat.newFloat(getRuntime(), Math.pow(big2dbl(this), (double)other));

}

/** rb_big_pow

@JRubyMethod(name = {"**", "power"}, required = 1, compat = RUBY1_9)

public IRubyObject op_pow19(ThreadContext context, IRubyObject other) {

Ruby runtime = context.runtime;

if (other == RubyFixnum.zero(runtime)) return RubyFixnum.one(runtime);

double d;

if (other instanceof RubyFixnum) {

RubyFixnum fix = (RubyFixnum) other;

long fixValue = fix.getLongValue();

if (fixValue < 0) {

return RubyRational.newRationalRaw(runtime, this).callMethod(context, "**", other);

}

// MRI issuses warning here on (RBIGNUM(x)->len * SIZEOF_BDIGITS * yy > 1024*1024)

if (((value.bitLength() + 7) / 8) * 4 * Math.abs(fixValue) > 1024 * 1024) {

getRuntime().getWarnings().warn(ID.MAY_BE_TOO_BIG, "in a**b, b may be too big");

}

if (fixValue >= 0) {

return bignorm(runtime, value.pow((int) fixValue)); // num2int is also implemented

} else {

return RubyFloat.newFloat(runtime, Math.pow(big2dbl(this), (double)fixValue));

}

} else if (other instanceof RubyBignum) {

d = ((RubyBignum) other).getDoubleValue();

getRuntime().getWarnings().warn(ID.MAY_BE_TOO_BIG, "in a**b, b may be too big");

} else if (other instanceof RubyFloat) {

d = ((RubyFloat) other).getDoubleValue();

if (this.compareTo(RubyFixnum.zero(runtime)) == -1

&& d != Math.round(d)) {

return RubyComplex.newComplexRaw(getRuntime(), this).callMethod(context, "**", other);

}

} else {

return coerceBin(context, "**", other);

}

double pow = Math.pow(big2dbl(this), d);

if (Double.isInfinite(pow)) {

return RubyFloat.newFloat(runtime, pow);

}

return RubyNumeric.dbl2num(runtime, pow);

}

/** rb_big_and

@JRubyMethod(name = "&", required = 1, compat = RUBY1_8)

public IRubyObject op_and(ThreadContext context, IRubyObject other) {

other = other.convertToInteger();

if (other instanceof RubyBignum) {

return bignorm(getRuntime(), value.and(((RubyBignum) other).value));

} else if (other instanceof RubyFixnum) {

return bignorm(getRuntime(), value.and(fix2big((RubyFixnum)other)));

}

return coerceBin(context, "&", other);

}

@JRubyMethod(name = "&", required = 1, compat = RUBY1_9)

public IRubyObject op_and19(ThreadContext context, IRubyObject other) {

return op_and(context, convertToInteger(context, other));

}

/** rb_big_or

@JRubyMethod(name = "|", required = 1, compat = RUBY1_8)

public IRubyObject op_or(ThreadContext context, IRubyObject other) {

other = other.convertToInteger();

if (other instanceof RubyBignum) {

return bignorm(getRuntime(), value.or(((RubyBignum) other).value));

}

if (other instanceof RubyFixnum) { // no bignorm here needed

return bignorm(getRuntime(), value.or(fix2big((RubyFixnum)other)));

}

return coerceBin(context, "|", other);

}

@JRubyMethod(name = "|", required = 1, compat = RUBY1_9)

public IRubyObject op_or19(ThreadContext context, IRubyObject other) {

return op_or(context, convertToInteger(context, other));

}

/** rb_big_xor

@JRubyMethod(name = "^", required = 1, compat = RUBY1_8)

public IRubyObject op_xor(ThreadContext context, IRubyObject other) {

other = other.convertToInteger();

if (other instanceof RubyBignum) {

return bignorm(getRuntime(), value.xor(((RubyBignum) other).value));

}

if (other instanceof RubyFixnum) {

return bignorm(getRuntime(), value.xor(BigInteger.valueOf(((RubyFixnum) other).getLongValue())));

}

return coerceBin(context, "^", other);

}

@JRubyMethod(name = "^", required = 1, compat = RUBY1_9)

public IRubyObject op_xor19(ThreadContext context, IRubyObject other) {

return op_xor(context, convertToInteger(context, other));

}

private IRubyObject convertToInteger(ThreadContext context, IRubyObject other) {

if (other instanceof RubyFloat) {

throw context.runtime.newTypeError("can't convert Float into Integer");

}

return other.convertToInteger();

}

/** rb_big_neg

@JRubyMethod(name = "~")

public IRubyObject op_neg() {

return RubyBignum.newBignum(getRuntime(), value.not());

}

/** rb_big_lshift

@JRubyMethod(name = "<<", required = 1)

public IRubyObject op_lshift(IRubyObject other) {

long shift;

boolean neg = false;

for (;;) {

if (other instanceof RubyFixnum) {

shift = ((RubyFixnum)other).getLongValue();

if (shift < 0) {

neg = true;

shift = -shift;

}

break;

} else if (other instanceof RubyBignum) {

RubyBignum otherBignum = (RubyBignum)other;

if (otherBignum.value.signum() < 0) {

IRubyObject tmp = otherBignum.checkShiftDown(this);

if (!tmp.isNil()) return tmp;

neg = true;

}

shift = big2long(otherBignum);

break;

}

other = other.convertToInteger();

}

return bignorm(getRuntime(), neg ? value.shiftRight((int)shift) : value.shiftLeft((int)shift));

}

/** rb_big_rshift

@JRubyMethod(name = ">>", required = 1)

public IRubyObject op_rshift(IRubyObject other) {

long shift;

boolean neg = false;

for (;;) {

if (other instanceof RubyFixnum) {

shift = ((RubyFixnum)other).getLongValue();

if (shift < 0) {

neg = true;

shift = -shift;

}

break;

} else if (other instanceof RubyBignum) {

RubyBignum otherBignum = (RubyBignum)other;

if (otherBignum.value.signum() >= 0) {

IRubyObject tmp = otherBignum.checkShiftDown(this);

if (!tmp.isNil()) return tmp;

} else {

neg = true;

}

shift = big2long(otherBignum);

break;

}

other = other.convertToInteger();

}

return bignorm(getRuntime(), neg ? value.shiftLeft((int)shift) : value.shiftRight((int)shift));

}

/** rb_big_aref

@JRubyMethod(name = "[]", required = 1)

public RubyFixnum op_aref(IRubyObject other) {

if (other instanceof RubyBignum) {

// Need to normalize first

other = bignorm(getRuntime(), ((RubyBignum) other).value);

if (other instanceof RubyBignum) {

// '!=' for negative value

if ((((RubyBignum) other).value.signum() >= 0) != (value.signum() == -1)) {

return RubyFixnum.zero(getRuntime());

}

return RubyFixnum.one(getRuntime());

}

long position = num2long(other);

if (position < 0 || position > Integer.MAX_VALUE) {

return RubyFixnum.zero(getRuntime());

}

return value.testBit((int)position) ? RubyFixnum.one(getRuntime()) : RubyFixnum.zero(getRuntime());

}

@Override

public final int compareTo(IRubyObject other) {

if (other instanceof RubyBignum) {

return value.compareTo(((RubyBignum)other).value);

}

return (int)coerceCmp(getRuntime().getCurrentContext(), "<=>", other).convertToInteger().getLongValue();

}

/** rb_big_cmp

@JRubyMethod(name = "<=>", required = 1)

public IRubyObject op_cmp(ThreadContext context, IRubyObject other) {

final BigInteger otherValue;

if (other instanceof RubyFixnum) {

otherValue = fix2big((RubyFixnum) other);

} else if (other instanceof RubyBignum) {

otherValue = ((RubyBignum) other).value;

} else if (other instanceof RubyFloat) {

RubyFloat flt = (RubyFloat)other;

if (flt.infinite_p().isTrue()) {

if (flt.getDoubleValue() > 0.0) return RubyFixnum.minus_one(getRuntime());

return RubyFixnum.one(getRuntime());

}

return dbl_cmp(getRuntime(), big2dbl(this), flt.getDoubleValue());

} else {

return coerceCmp(context, "<=>", other);

}

// wow, the only time we can use the java protocol ;)

return RubyFixnum.newFixnum(getRuntime(), value.compareTo(otherValue));

}

/** rb_big_eq

@JRubyMethod(name = "==", required = 1)

public IRubyObject op_equal(IRubyObject other) {

final BigInteger otherValue;

if (other instanceof RubyFixnum) {

otherValue = fix2big((RubyFixnum) other);

} else if (other instanceof RubyBignum) {

otherValue = ((RubyBignum) other).value;

} else if (other instanceof RubyFloat) {

double a = ((RubyFloat) other).getDoubleValue();

if (Double.isNaN(a)) {

return getRuntime().getFalse();

}

return RubyBoolean.newBoolean(getRuntime(), a == big2dbl(this));

} else {

return other.op_eqq(getRuntime().getCurrentContext(), this);

}

return RubyBoolean.newBoolean(getRuntime(), value.compareTo(otherValue) == 0);

}

/** rb_big_eql

@JRubyMethod(name = {"eql?", "==="}, required = 1)

@Override

public IRubyObject eql_p(IRubyObject other) {

if (other instanceof RubyBignum) {

return value.compareTo(((RubyBignum)other).value) == 0 ? getRuntime().getTrue() : getRuntime().getFalse();

}

return getRuntime().getFalse();

}

/** rb_big_hash

@JRubyMethod(name = "hash")

@Override

public RubyFixnum hash() {

return getRuntime().newFixnum(value.hashCode());

}

/** rb_big_to_f

@JRubyMethod(name = "to_f")

public IRubyObject to_f() {

return RubyFloat.newFloat(getRuntime(), getDoubleValue());

}

/** rb_big_abs

@JRubyMethod(name = "abs")

public IRubyObject abs() {

return RubyBignum.newBignum(getRuntime(), value.abs());

}

/** rb_big_size

@JRubyMethod(name = "size")

public IRubyObject size() {

return getRuntime().newFixnum((value.bitLength() + 7) / 8);

}

public static void marshalTo(RubyBignum bignum, MarshalStream output) throws IOException {

output.registerLinkTarget(bignum);

output.write(bignum.value.signum() >= 0 ? '+' : '-');

BigInteger absValue = bignum.value.abs();

byte[] digits = absValue.toByteArray();

boolean oddLengthNonzeroStart = (digits.length % 2 != 0 && digits[0] != 0);

int shortLength = digits.length / 2;

if (oddLengthNonzeroStart) {

shortLength++;

}

output.writeInt(shortLength);

for (int i = 1; i <= shortLength * 2 && i <= digits.length; i++) {

output.write(digits[digits.length - i]);

}

if (oddLengthNonzeroStart) {

// Pad with a 0

output.write(0);

}

public static RubyNumeric unmarshalFrom(UnmarshalStream input) throws IOException {

boolean positive = input.readUnsignedByte() == '+';

int shortLength = input.unmarshalInt();

// BigInteger required a sign byte in incoming array

byte[] digits = new byte[shortLength * 2 + 1];

for (int i = digits.length - 1; i >= 1; i--) {

digits[i] = input.readSignedByte();

}

BigInteger value = new BigInteger(digits);

if (!positive) {

value = value.negate();

}

RubyNumeric result = bignorm(input.getRuntime(), value);

input.registerLinkTarget(result);

return result;

}

jruby/src/org/jruby/RubyBignum.java at parallel_boot · MSNexploder/jruby · GitHub

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