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/***
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000-2011 INRIA, France Telecom
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.snapscript.asm.optimizer;
import java.util.HashMap;
import org.snapscript.asm.Handle;
import org.snapscript.asm.Opcodes;
import org.snapscript.asm.Type;
/**
* A constant pool.
*
* @author Eric Bruneton
*/
public class ConstantPool extends HashMap {
private static final long serialVersionUID = 1L;
private final Constant key1 = new Constant();
private final Constant key2 = new Constant();
private final Constant key3 = new Constant();
private final Constant key4 = new Constant();
private final Constant key5 = new Constant();
public Constant newInteger(final int value) {
key1.set(value);
Constant result = get(key1);
if (result == null) {
result = new Constant(key1);
put(result);
}
return result;
}
public Constant newFloat(final float value) {
key1.set(value);
Constant result = get(key1);
if (result == null) {
result = new Constant(key1);
put(result);
}
return result;
}
public Constant newLong(final long value) {
key1.set(value);
Constant result = get(key1);
if (result == null) {
result = new Constant(key1);
put(result);
}
return result;
}
public Constant newDouble(final double value) {
key1.set(value);
Constant result = get(key1);
if (result == null) {
result = new Constant(key1);
put(result);
}
return result;
}
public Constant newUTF8(final String value) {
key1.set('s', value, null, null);
Constant result = get(key1);
if (result == null) {
result = new Constant(key1);
put(result);
}
return result;
}
private Constant newString(final String value) {
key2.set('S', value, null, null);
Constant result = get(key2);
if (result == null) {
newUTF8(value);
result = new Constant(key2);
put(result);
}
return result;
}
public Constant newClass(final String value) {
key2.set('C', value, null, null);
Constant result = get(key2);
if (result == null) {
newUTF8(value);
result = new Constant(key2);
put(result);
}
return result;
}
public Constant newMethodType(final String methodDescriptor) {
key2.set('t', methodDescriptor, null, null);
Constant result = get(key2);
if (result == null) {
newUTF8(methodDescriptor);
result = new Constant(key2);
put(result);
}
return result;
}
public Constant newHandle(final int tag, final String owner,
final String name, final String desc, final boolean itf) {
key4.set((char) ('h' + tag - 1 + (itf && tag != Opcodes.H_INVOKEINTERFACE? 4: 0)), owner, name, desc);
Constant result = get(key4);
if (result == null) {
if (tag <= Opcodes.H_PUTSTATIC) {
newField(owner, name, desc);
} else {
newMethod(owner, name, desc, itf);
}
result = new Constant(key4);
put(result);
}
return result;
}
public Constant newConst(final Object cst) {
if (cst instanceof Integer) {
int val = ((Integer) cst).intValue();
return newInteger(val);
} else if (cst instanceof Float) {
float val = ((Float) cst).floatValue();
return newFloat(val);
} else if (cst instanceof Long) {
long val = ((Long) cst).longValue();
return newLong(val);
} else if (cst instanceof Double) {
double val = ((Double) cst).doubleValue();
return newDouble(val);
} else if (cst instanceof String) {
return newString((String) cst);
} else if (cst instanceof Type) {
Type t = (Type) cst;
int s = t.getSort();
if (s == Type.OBJECT) {
return newClass(t.getInternalName());
} else if (s == Type.METHOD) {
return newMethodType(t.getDescriptor());
} else { // s == primitive type or array
return newClass(t.getDescriptor());
}
} else if (cst instanceof Handle) {
Handle h = (Handle) cst;
return newHandle(h.getTag(), h.getOwner(), h.getName(), h.getDesc(), h.isInterface());
} else {
throw new IllegalArgumentException("value " + cst);
}
}
public Constant newField(final String owner, final String name,
final String desc) {
key3.set('G', owner, name, desc);
Constant result = get(key3);
if (result == null) {
newClass(owner);
newNameType(name, desc);
result = new Constant(key3);
put(result);
}
return result;
}
public Constant newMethod(final String owner, final String name,
final String desc, final boolean itf) {
key3.set(itf ? 'N' : 'M', owner, name, desc);
Constant result = get(key3);
if (result == null) {
newClass(owner);
newNameType(name, desc);
result = new Constant(key3);
put(result);
}
return result;
}
public Constant newInvokeDynamic(String name, String desc, Handle bsm,
Object... bsmArgs) {
key5.set(name, desc, bsm, bsmArgs);
Constant result = get(key5);
if (result == null) {
newNameType(name, desc);
newHandle(bsm.getTag(), bsm.getOwner(), bsm.getName(),
bsm.getDesc(), bsm.isInterface());
for (int i = 0; i < bsmArgs.length; i++) {
newConst(bsmArgs[i]);
}
result = new Constant(key5);
put(result);
}
return result;
}
public Constant newNameType(final String name, final String desc) {
key2.set('T', name, desc, null);
Constant result = get(key2);
if (result == null) {
newUTF8(name);
newUTF8(desc);
result = new Constant(key2);
put(result);
}
return result;
}
private Constant get(final Constant key) {
return get((Object) key);
}
private void put(final Constant cst) {
put(cst, cst);
}
}
