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Diffstat (limited to 'src/proguard/evaluation/value/Value.java')
| -rw-r--r-- | src/proguard/evaluation/value/Value.java | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/src/proguard/evaluation/value/Value.java b/src/proguard/evaluation/value/Value.java new file mode 100644 index 0000000..e24ece1 --- /dev/null +++ b/src/proguard/evaluation/value/Value.java @@ -0,0 +1,169 @@ +/* + * ProGuard -- shrinking, optimization, obfuscation, and preverification + * of Java bytecode. + * + * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu) + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +package proguard.evaluation.value; + +/** + * This abstract class represents a partially evaluated value. + * + * @author Eric Lafortune + */ +public abstract class Value +{ + public static final int NEVER = -1; + public static final int MAYBE = 0; + public static final int ALWAYS = 1; + + public static final int TYPE_INTEGER = 1; + public static final int TYPE_LONG = 2; + public static final int TYPE_FLOAT = 3; + public static final int TYPE_DOUBLE = 4; + public static final int TYPE_REFERENCE = 5; + public static final int TYPE_INSTRUCTION_OFFSET = 6; + public static final int TYPE_TOP = 7; + + + /** + * Returns this Value as a Category1Value. + */ + public Category1Value category1Value() + { + throw new IllegalArgumentException("Value is not a Category 1 value [" + this.getClass().getName() + "]"); + } + + /** + * Returns this Value as a Category2Value. + */ + public Category2Value category2Value() + { + throw new IllegalArgumentException("Value is not a Category 2 value [" + this.getClass().getName() + "]"); + } + + + /** + * Returns this Value as an IntegerValue. + */ + public IntegerValue integerValue() + { + throw new IllegalArgumentException("Value is not an integer value [" + this.getClass().getName() + "]"); + } + + /** + * Returns this Value as a LongValue. + */ + public LongValue longValue() + { + throw new IllegalArgumentException("Value is not a long value [" + this.getClass().getName() + "]"); + } + + /** + * Returns this Value as a FloatValue. + */ + public FloatValue floatValue() + { + throw new IllegalArgumentException("Value is not a float value [" + this.getClass().getName() + "]"); + } + + /** + * Returns this Value as a DoubleValue. + */ + public DoubleValue doubleValue() + { + throw new IllegalArgumentException("Value is not a double value [" + this.getClass().getName() + "]"); + } + + /** + * Returns this Value as a ReferenceValue. + */ + public ReferenceValue referenceValue() + { + throw new IllegalArgumentException("Value is not a reference value [" + this.getClass().getName() + "]"); + } + + /** + * Returns this Value as an InstructionOffsetValue. + */ + public InstructionOffsetValue instructionOffsetValue() + { + throw new IllegalArgumentException("Value is not an instruction offset value [" + this.getClass().getName() + "]"); + } + + + /** + * Returns whether this Value represents a single specific (but possibly + * unknown) value. + */ + public boolean isSpecific() + { + return false; + } + + + /** + * Returns whether this Value represents a single particular (known) + * value. + */ + public boolean isParticular() + { + return false; + } + + + /** + * Returns the generalization of this Value and the given other Value. + */ + public abstract Value generalize(Value other); + + + /** + * Returns whether the computational type of this Value is a category 2 type. + * This means that it takes up the space of two category 1 types on the + * stack, for instance. + */ + public abstract boolean isCategory2(); + + + /** + * Returns the computational type of this Value. + * @return <code>TYPE_INTEGER</code>, + * <code>TYPE_LONG</code>, + * <code>TYPE_FLOAT</code>, + * <code>TYPE_DOUBLE</code>, + * <code>TYPE_REFERENCE</code>, or + * <code>TYPE_INSTRUCTION_OFFSET</code>. + */ + public abstract int computationalType(); + + + /** + * Returns the internal type of this Value. + * @return <code>ClassConstants.INTERNAL_TYPE_BOOLEAN</code>, + * <code>ClassConstants.INTERNAL_TYPE_BYTE</code>, + * <code>ClassConstants.INTERNAL_TYPE_CHAR</code>, + * <code>ClassConstants.INTERNAL_TYPE_SHORT</code>, + * <code>ClassConstants.INTERNAL_TYPE_INT</code>, + * <code>ClassConstants.INTERNAL_TYPE_LONG</code>, + * <code>ClassConstants.INTERNAL_TYPE_FLOAT</code>, + * <code>ClassConstants.INTERNAL_TYPE_DOUBLE</code>, + * <code>ClassConstants.INTERNAL_TYPE_CLASS_START ... ClassConstants.INTERNAL_TYPE_CLASS_END</code>, or + * an array type containing any of these types (always as String). + */ + public abstract String internalType(); +} |