/******************************************************************************* | |
* Copyright (c) 2000, 2004 IBM Corporation and others. | |
* All rights reserved. This program and the accompanying materials | |
* are made available under the terms of the Common Public License v1.0 | |
* which accompanies this distribution, and is available at | |
* http://www.eclipse.org/legal/cpl-v10.html | |
* | |
* Contributors: | |
* IBM Corporation - initial API and implementation | |
*******************************************************************************/ | |
package org.eclipse.wst.jsdt.internal.compiler.ast; | |
import org.eclipse.wst.jsdt.internal.compiler.ASTVisitor; | |
import org.eclipse.wst.jsdt.internal.compiler.impl.*; | |
import org.eclipse.wst.jsdt.internal.compiler.codegen.*; | |
import org.eclipse.wst.jsdt.internal.compiler.lookup.*; | |
public class LongLiteral extends NumberLiteral { | |
long value; | |
static final Constant FORMAT_ERROR = new DoubleConstant(1.0/0.0); // NaN; | |
public LongLiteral(char[] token, int s,int e) { | |
super(token, s,e); | |
} | |
public LongLiteral(char[] token, int s,int e, long value) { | |
this(token, s,e); | |
this.value = value; | |
} | |
public void computeConstant() { | |
//the overflow (when radix=10) is tested using the fact that | |
//the value should always grow during its computation | |
int length = source.length - 1; //minus one because the last char is 'l' or 'L' | |
long computedValue ; | |
if (source[0] == '0') | |
{ if (length == 1) { constant = Constant.fromValue(0L); return; } | |
final int shift,radix; | |
int j ; | |
if ( (source[1] == 'x') || (source[1] == 'X') ) | |
{ shift = 4 ; j = 2; radix = 16;} | |
else | |
{ shift = 3 ; j = 1; radix = 8;} | |
int nbDigit = 0; | |
while (source[j]=='0') | |
{ j++; //jump over redondant zero | |
if ( j == length) | |
{ //watch for 0000000000000L | |
constant = Constant.fromValue(value = 0L); | |
return ;}} | |
int digitValue ; | |
if ((digitValue = Character.digit(source[j++],radix)) < 0 ) | |
{ constant = FORMAT_ERROR; return ;} | |
if (digitValue >= 8) nbDigit = 4; | |
else if (digitValue >= 4) nbDigit = 3; | |
else if (digitValue >= 2) nbDigit = 2; | |
else nbDigit = 1; //digitValue is not 0 | |
computedValue = digitValue ; | |
while (j<length) | |
{ if ((digitValue = Character.digit(source[j++],radix)) < 0 ) | |
{ constant = FORMAT_ERROR; return ;} | |
if ((nbDigit += shift) > 64) return /*constant stays null*/ ; | |
computedValue = (computedValue<<shift) | digitValue ;}} | |
else | |
{ //-----------case radix=10----------------- | |
long previous = computedValue = 0; | |
for (int i = 0 ; i < length; i++) | |
{ int digitValue ; | |
if ((digitValue = Character.digit(source[i], 10)) < 0 ) return /*constant stays null*/ ; | |
previous = computedValue; | |
computedValue = 10 * computedValue + digitValue ; | |
if (previous > computedValue) return /*constant stays null*/;}} | |
constant = Constant.fromValue(value = computedValue); | |
} | |
/** | |
* Code generation for long literal | |
* | |
* @param currentScope org.eclipse.wst.jsdt.internal.compiler.lookup.BlockScope | |
* @param codeStream org.eclipse.wst.jsdt.internal.compiler.codegen.CodeStream | |
* @param valueRequired boolean | |
*/ | |
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) { | |
int pc = codeStream.position; | |
if (valueRequired) | |
if ((implicitConversion >> 4) == T_long) | |
codeStream.generateInlinedValue(value); | |
else | |
codeStream.generateConstant(constant, implicitConversion); | |
codeStream.recordPositionsFrom(pc, this.sourceStart); | |
} | |
public TypeBinding literalType(BlockScope scope) { | |
return LongBinding; | |
} | |
public final boolean mayRepresentMIN_VALUE(){ | |
//a special autorized int literral is 9223372036854775808L | |
//which is ONE over the limit. This special case | |
//only is used in combinaison with - to denote | |
//the minimal value of int -9223372036854775808L | |
return ((source.length == 20) && | |
(source[0] == '9') && | |
(source[1] == '2') && | |
(source[2] == '2') && | |
(source[3] == '3') && | |
(source[4] == '3') && | |
(source[5] == '7') && | |
(source[6] == '2') && | |
(source[7] == '0') && | |
(source[8] == '3') && | |
(source[9] == '6') && | |
(source[10] == '8') && | |
(source[11] == '5') && | |
(source[12] == '4') && | |
(source[13] == '7') && | |
(source[14] == '7') && | |
(source[15] == '5') && | |
(source[16] == '8') && | |
(source[17] == '0') && | |
(source[18] == '8'));} | |
public TypeBinding resolveType(BlockScope scope) { | |
// the format may be incorrect while the scanner could detect | |
// such error only on painfull tests...easier and faster here | |
TypeBinding tb = super.resolveType(scope); | |
if (constant == FORMAT_ERROR) { | |
constant = NotAConstant; | |
scope.problemReporter().constantOutOfFormat(this); | |
this.resolvedType = null; | |
return null; | |
} | |
return tb; | |
} | |
public void traverse(ASTVisitor visitor, BlockScope scope) { | |
visitor.visit(this, scope); | |
visitor.endVisit(this, scope); | |
} | |
} |