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/* NSC -- new scala compiler
* Copyright 2005 LAMP/EPFL
* @author Martin Odersky
*/
// $Id$
package scala.tools.nsc.symtab;
import classfile.PickleFormat._;
[_trait_] abstract class Constants: SymbolTable {
import definitions._;
final val UnitTag = LITERALunit - LITERAL;
final val BooleanTag = LITERALboolean - LITERAL;
final val ByteTag = LITERALbyte - LITERAL;
final val ShortTag = LITERALshort - LITERAL;
final val CharTag = LITERALchar - LITERAL;
final val IntTag = LITERALint - LITERAL;
final val LongTag = LITERALlong - LITERAL;
final val FloatTag = LITERALfloat - LITERAL;
final val DoubleTag = LITERALdouble - LITERAL;
final val StringTag = LITERALstring - LITERAL;
final val NullTag = LITERALnull - LITERAL;
final val ZeroTag = LITERALzero - LITERAL;
case class Constant(value: Any) {
val tag: int =
if (value.isInstanceOf[unit]) UnitTag
else if (value.isInstanceOf[boolean]) BooleanTag
else if (value.isInstanceOf[byte]) ByteTag
else if (value.isInstanceOf[short]) ShortTag
else if (value.isInstanceOf[char]) CharTag
else if (value.isInstanceOf[int]) IntTag
else if (value.isInstanceOf[long]) LongTag
else if (value.isInstanceOf[float]) FloatTag
else if (value.isInstanceOf[double]) DoubleTag
else if (value.isInstanceOf[String]) StringTag
else if (value == null) NullTag
else throw new Error("bad constant value: " + value);
def tpe: Type = tag match {
case UnitTag => UnitClass.tpe
case BooleanTag => BooleanClass.tpe
case ByteTag => ByteClass.tpe
case ShortTag => ShortClass.tpe
case CharTag => CharClass.tpe
case IntTag => IntClass.tpe
case LongTag => LongClass.tpe
case FloatTag => FloatClass.tpe
case DoubleTag => DoubleClass.tpe
case StringTag => StringClass.tpe
case NullTag => AllRefClass.tpe
}
/** We need the equals method to take account of tags as well as values */
override def equals(other: Any): boolean = other match {
case that: Constant => this.value == that.value && this.tag == that.tag
case _ => false
}
def booleanValue: boolean =
if (tag == BooleanTag) value.asInstanceOf$erased[boolean]
else throw new Error("value " + value + " is not a boolean");
def byteValue: byte = tag match {
case ByteTag => value.asInstanceOf$erased[byte]
case ShortTag => value.asInstanceOf$erased[short].asInstanceOf[byte]
case CharTag => value.asInstanceOf$erased[char].asInstanceOf[byte]
case IntTag => value.asInstanceOf$erased[int].asInstanceOf[byte]
case LongTag => value.asInstanceOf$erased[long].asInstanceOf[byte]
case FloatTag => value.asInstanceOf$erased[float].asInstanceOf[byte]
case DoubleTag => value.asInstanceOf$erased[double].asInstanceOf[byte]
case _ => throw new Error("value " + value + " is not a byte")
}
def shortValue: short = tag match {
case ByteTag => value.asInstanceOf$erased[byte].asInstanceOf[short]
case ShortTag => value.asInstanceOf$erased[short]
case CharTag => value.asInstanceOf$erased[char].asInstanceOf[short]
case IntTag => value.asInstanceOf$erased[int].asInstanceOf[short]
case LongTag => value.asInstanceOf$erased[long].asInstanceOf[short]
case FloatTag => value.asInstanceOf$erased[float].asInstanceOf[short]
case DoubleTag => value.asInstanceOf$erased[double].asInstanceOf[short]
case _ => throw new Error("value " + value + " is not a short")
}
def charValue: char = tag match {
case ByteTag => value.asInstanceOf$erased[byte].asInstanceOf[char]
case ShortTag => value.asInstanceOf$erased[short].asInstanceOf[char]
case CharTag => value.asInstanceOf$erased[char]
case IntTag => value.asInstanceOf$erased[int].asInstanceOf[char]
case LongTag => value.asInstanceOf$erased[long].asInstanceOf[char]
case FloatTag => value.asInstanceOf$erased[float].asInstanceOf[char]
case DoubleTag => value.asInstanceOf$erased[double].asInstanceOf[char]
case _ => throw new Error("value " + value + " is not a char")
}
def intValue: int = tag match {
case ByteTag => value.asInstanceOf$erased[byte].asInstanceOf[int]
case ShortTag => value.asInstanceOf$erased[short].asInstanceOf[int]
case CharTag => value.asInstanceOf$erased[char].asInstanceOf[int]
case IntTag => value.asInstanceOf$erased[int]
case LongTag => value.asInstanceOf$erased[long].asInstanceOf[int]
case FloatTag => value.asInstanceOf$erased[float].asInstanceOf[int]
case DoubleTag => value.asInstanceOf$erased[double].asInstanceOf[int]
case _ => throw new Error("value " + value + " is not an int")
}
def longValue: long = tag match {
case ByteTag => value.asInstanceOf$erased[byte].asInstanceOf[long]
case ShortTag => value.asInstanceOf$erased[short].asInstanceOf[long]
case CharTag => value.asInstanceOf$erased[char].asInstanceOf[long]
case IntTag => value.asInstanceOf$erased[int].asInstanceOf[long]
case LongTag => value.asInstanceOf$erased[long]
case FloatTag => value.asInstanceOf$erased[float].asInstanceOf[long]
case DoubleTag => value.asInstanceOf$erased[double].asInstanceOf[long]
case _ => throw new Error("value " + value + " is not a long")
}
def floatValue: float = tag match {
case ByteTag => value.asInstanceOf$erased[byte].asInstanceOf[float]
case ShortTag => value.asInstanceOf$erased[short].asInstanceOf[float]
case CharTag => value.asInstanceOf$erased[char].asInstanceOf[float]
case IntTag => value.asInstanceOf$erased[int].asInstanceOf[float]
case LongTag => value.asInstanceOf$erased[long].asInstanceOf[float]
case FloatTag => value.asInstanceOf$erased[float]
case DoubleTag => value.asInstanceOf$erased[double].asInstanceOf[float]
case _ => throw new Error("value " + value + " is not a float")
}
/*
def doubleValue: double = {
System.out.println("doubleValue " + tag + " " + value);
tag match {
case ByteTag => System.out.println("Byte"); value.asInstanceOf$erased[byte].asInstanceOf[double]
case ShortTag => System.out.println("Short"); value.asInstanceOf$erased[short].asInstanceOf[double]
case CharTag => System.out.println("Char"); value.asInstanceOf$erased[char].asInstanceOf[double]
case IntTag => System.out.println("Int"); value.asInstanceOf$erased[int].asInstanceOf[double]
case LongTag => System.out.println("Long"); value.asInstanceOf$erased[long].asInstanceOf[double]
case FloatTag => System.out.println("Float"); value.asInstanceOf$erased[float].asInstanceOf[double]
case DoubleTag => System.out.println("Double"); value.asInstanceOf$erased[double]
case _ => System.out.println("error"); throw new Error("value " + value + " is not a double")
}
}
*/
def doubleValue: double = tag match {
case ByteTag => value.asInstanceOf$erased[byte].asInstanceOf[double]
case ShortTag => value.asInstanceOf$erased[short].asInstanceOf[double]
case CharTag => value.asInstanceOf$erased[char].asInstanceOf[double]
case IntTag => value.asInstanceOf$erased[int].asInstanceOf[double]
case LongTag => value.asInstanceOf$erased[long].asInstanceOf[double]
case FloatTag => value.asInstanceOf$erased[float].asInstanceOf[double]
case DoubleTag => value.asInstanceOf$erased[double]
case _ => throw new Error("value " + value + " is not a double")
}
/** Convert constant value to conform to given type */
def convertTo(pt: Type): Constant = {
val target = pt.symbol;
if (target == tpe.symbol)
this
else if (target == ByteClass && ByteTag <= tag && tag <= IntTag &&
-128 <= intValue && intValue <= 127)
Constant(byteValue)
else if (target == ShortClass && ByteTag <= tag && tag <= IntTag &&
-32768 <= intValue && intValue <= 32767)
Constant(shortValue)
else if (target == CharClass && ByteTag <= tag && tag <= IntTag &&
0 <= intValue && intValue <= 65635)
Constant(charValue)
else if (target == IntClass && ByteTag <= tag && tag <= IntTag)
Constant(intValue)
else if (target == LongClass && ByteTag <= tag && tag <= LongTag)
Constant(longValue)
else if (target == FloatClass && ByteTag <= tag && tag <= FloatTag)
Constant(floatValue)
else if (target == DoubleClass && ByteTag <= tag && tag <= DoubleTag)
Constant(doubleValue)
else null
}
def stringValue: String =
if (value == null) "null" else value.toString();
override def hashCode(): int =
if (value == null) 0 else value.hashCode() * 41 + 17;
}
}
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