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-/* ____ ____ ____ ____ ______ *\
-** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
-** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
-** /_____/\____/\___/\____/____/ **
-\* */
-
-// $Id$
-
-package scalac.atree;
-
-import scalac.util.Debug;
-import scalac.symtab.Symbol;
-
-/** This class represents a constant. */
-public class AConstant {
-
- public static final AConstant[] EMPTY_ARRAY = new AConstant[0];
-
- //########################################################################
- // Public Cases
-
- public case UNIT;
- public case BOOLEAN(boolean value);
- public case BYTE(byte value);
- public case SHORT(short value);
- public case CHAR(char value);
- public case INT(int value);
- public case LONG(long value);
- public case FLOAT(float value);
- public case DOUBLE(double value);
- public case STRING(String value);
- public case SYMBOL_NAME(Symbol value);
- public case NULL;
- public case ZERO;
-
- //########################################################################
- // Public Methods
-
- /** Returns the type kind of this constant. */
- public ATypeKind kind() {
- switch (this) {
- case UNIT:
- return ATypeKind.UNIT;
- case BOOLEAN(_):
- return ATypeKind.BOOL;
- case BYTE(_):
- return ATypeKind.I1;
- case SHORT(_):
- return ATypeKind.I2;
- case CHAR(_):
- return ATypeKind.U2;
- case INT(_):
- return ATypeKind.I4;
- case LONG(_):
- return ATypeKind.I8;
- case FLOAT(_):
- return ATypeKind.R4;
- case DOUBLE(_):
- return ATypeKind.R8;
- case STRING(_):
- case SYMBOL_NAME(_):
- return ATypeKind.STR;
- case NULL:
- return ATypeKind.NULL;
- case ZERO:
- return ATypeKind.ZERO;
- default:
- throw Debug.abort("unknown case", this);
- }
- }
-
-
- /** Converts this constant to a boolean value. */
- public boolean booleanValue() {
- switch (this) {
- case BOOLEAN(boolean value):
- return value;
- default:
- throw Debug.abort("not convertible to boolean", this);
- }
- }
-
- /** Converts this constant to a byte value. */
- public byte byteValue() {
- switch (this) {
- case BYTE(byte value):
- return (byte)value;
- case SHORT(short value):
- return (byte)value;
- case CHAR(char value):
- return (byte)value;
- case INT(int value):
- return (byte)value;
- case LONG(long value):
- return (byte)value;
- case FLOAT(float value):
- return (byte)value;
- case DOUBLE(double value):
- return (byte)value;
- default:
- throw Debug.abort("not convertible to byte", this);
- }
- }
-
- /** Converts this constant to a short value. */
- public short shortValue() {
- switch (this) {
- case BYTE(byte value):
- return (short)value;
- case SHORT(short value):
- return (short)value;
- case CHAR(char value):
- return (short)value;
- case INT(int value):
- return (short)value;
- case LONG(long value):
- return (short)value;
- case FLOAT(float value):
- return (short)value;
- case DOUBLE(double value):
- return (short)value;
- default:
- throw Debug.abort("not convertible to short", this);
- }
- }
-
- /** Converts this constant to a char value. */
- public char charValue() {
- switch (this) {
- case BYTE(byte value):
- return (char)value;
- case SHORT(short value):
- return (char)value;
- case CHAR(char value):
- return (char)value;
- case INT(int value):
- return (char)value;
- case LONG(long value):
- return (char)value;
- case FLOAT(float value):
- return (char)value;
- case DOUBLE(double value):
- return (char)value;
- default:
- throw Debug.abort("not convertible to char", this);
- }
- }
-
- /** Converts this constant to a int value. */
- public int intValue() {
- switch (this) {
- case BYTE(byte value):
- return (int)value;
- case SHORT(short value):
- return (int)value;
- case CHAR(char value):
- return (int)value;
- case INT(int value):
- return (int)value;
- case LONG(long value):
- return (int)value;
- case FLOAT(float value):
- return (int)value;
- case DOUBLE(double value):
- return (int)value;
- default:
- throw Debug.abort("not convertible to int", this);
- }
- }
-
- /** Converts this constant to a long value. */
- public long longValue() {
- switch (this) {
- case BYTE(byte value):
- return (long)value;
- case SHORT(short value):
- return (long)value;
- case CHAR(char value):
- return (long)value;
- case INT(int value):
- return (long)value;
- case LONG(long value):
- return (long)value;
- case FLOAT(float value):
- return (long)value;
- case DOUBLE(double value):
- return (long)value;
- default:
- throw Debug.abort("not convertible to long", this);
- }
- }
-
- /** Converts this constant to a float value. */
- public float floatValue() {
- switch (this) {
- case BYTE(byte value):
- return (float)value;
- case SHORT(short value):
- return (float)value;
- case CHAR(char value):
- return (float)value;
- case INT(int value):
- return (float)value;
- case LONG(long value):
- return (float)value;
- case FLOAT(float value):
- return (float)value;
- case DOUBLE(double value):
- return (float)value;
- default:
- throw Debug.abort("not convertible to float", this);
- }
- }
-
- /** Converts this constant to a double value. */
- public double doubleValue() {
- switch (this) {
- case BYTE(byte value):
- return (double)value;
- case SHORT(short value):
- return (double)value;
- case CHAR(char value):
- return (double)value;
- case INT(int value):
- return (double)value;
- case LONG(long value):
- return (double)value;
- case FLOAT(float value):
- return (double)value;
- case DOUBLE(double value):
- return (double)value;
- default:
- throw Debug.abort("not convertible to double", this);
- }
- }
-
- /** Converts this constant to a String value. */
- public String stringValue() {
- switch (this) {
- case UNIT:
- return "()";
- case BOOLEAN(boolean value):
- return String.valueOf(value);
- case BYTE(byte value):
- return String.valueOf(value);
- case SHORT(short value):
- return String.valueOf(value);
- case CHAR(char value):
- return String.valueOf(value);
- case INT(int value):
- return String.valueOf(value);
- case LONG(long value):
- return String.valueOf(value);
- case FLOAT(float value):
- return String.valueOf(value);
- case DOUBLE(double value):
- return String.valueOf(value);
- case STRING(String value):
- return value;
- case SYMBOL_NAME(Symbol value):
- return value.name.toString();
- case NULL:
- return String.valueOf(null);
- default:
- throw Debug.abort("not convertible to String", this);
- }
- }
-
- /** Tests whether this constant equals given Object. */
- public boolean equals(Object that) {
- if (this == that) return true;
- return (that instanceof AConstant) && this.equals((AConstant)that);
- }
-
- /** Tests whether this constant equals given one. */
- public boolean equals(AConstant that) {
- if (this == that) return true;
- if (null == that) return false;
- switch (this) {
- case UNIT:
- return false;
- case BOOLEAN(boolean ivalue):
- switch (that) {
- case BOOLEAN(boolean avalue):
- return ivalue == avalue;
- default:
- return false;
- }
- case BYTE(byte ivalue):
- switch (that) {
- case BYTE(byte avalue):
- return ivalue == avalue;
- default:
- return false;
- }
- case SHORT(short ivalue):
- switch (that) {
- case SHORT(short avalue):
- return ivalue == avalue;
- default:
- return false;
- }
- case CHAR(char ivalue):
- switch (that) {
- case CHAR(char avalue):
- return ivalue == avalue;
- default:
- return false;
- }
- case INT(int ivalue):
- switch (that) {
- case INT(int avalue):
- return ivalue == avalue;
- default:
- return false;
- }
- case LONG(long ivalue):
- switch (that) {
- case LONG(long avalue):
- return ivalue == avalue;
- default:
- return false;
- }
- case FLOAT(float ivalue):
- switch (that) {
- case FLOAT(float avalue):
- return ivalue == avalue;
- default:
- return false;
- }
- case DOUBLE(double ivalue):
- switch (that) {
- case DOUBLE(double avalue):
- return ivalue == avalue;
- default:
- return false;
- }
- case STRING(String ivalue):
- switch (that) {
- case STRING(String avalue):
- return ivalue.equals(avalue);
- default:
- return false;
- }
- case SYMBOL_NAME(Symbol ivalue):
- switch (that) {
- case SYMBOL_NAME(Symbol avalue):
- return ivalue == avalue;
- default:
- return false;
- }
- case NULL:
- return false;
- case ZERO:
- return false;
- default:
- throw Debug.abort("unknown case", this);
- }
- }
-
- /** Returns the hash code of this constant. */
- public int hashCode() {
- switch (this) {
- case UNIT:
- return 4041;
- case BOOLEAN(boolean value):
- return value ? 1231 : 1237;
- case BYTE(byte value):
- return value;
- case SHORT(short value):
- return value;
- case CHAR(char value):
- return value;
- case INT(int value):
- return value;
- case LONG(long value):
- long bits = value;
- return (int)(bits ^ (bits >>> 32));
- case FLOAT(float value):
- int bits = java.lang.Float.floatToIntBits(value);
- return bits;
- case DOUBLE(double value):
- long bits = java.lang.Double.doubleToLongBits(value);
- return (int)(bits ^ (bits >>> 32));
- case STRING(String value):
- return value.hashCode();
- case SYMBOL_NAME(Symbol value):
- return value.hashCode();
- case NULL:
- return 0;
- case ZERO:
- return 0;
- default:
- throw Debug.abort("unknown case", this);
- }
- }
-
- /** Returns a string representation of this constant. */
- public String toString() {
- return new ATreePrinter().printConstant(this).toString();
- }
-
- //########################################################################
-}
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