/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.harmony.pack200;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.objectweb.asm.Label;
/**
* Bytecode bands (corresponds to the <code>bc_bands</code> set of bands in the
* pack200 specification)
*/
public class BcBands extends BandSet {
private final CpBands cpBands;
private final Segment segment;
public BcBands(CpBands cpBands, Segment segment, int effort) {
super(effort, segment.getSegmentHeader());
this.cpBands = cpBands;
this.segment = segment;
}
private final IntList bcCodes = new IntList();
private final IntList bcCaseCount = new IntList();
private final IntList bcCaseValue = new IntList();
private final IntList bcByte = new IntList();
private final IntList bcShort = new IntList();
private final IntList bcLocal = new IntList();
private final List bcLabel = new ArrayList();
private final List bcIntref = new ArrayList();
private final List bcFloatRef = new ArrayList();
private final List bcLongRef = new ArrayList();
private final List bcDoubleRef = new ArrayList();
private final List bcStringRef = new ArrayList();
private final List bcClassRef = new ArrayList();
private final List bcFieldRef = new ArrayList();
private final List bcMethodRef = new ArrayList();
private final List bcIMethodRef = new ArrayList();
private List bcThisField = new ArrayList();
private final List bcSuperField = new ArrayList();
private List bcThisMethod = new ArrayList();
private List bcSuperMethod = new ArrayList();
private List bcInitRef = new ArrayList();
private String currentClass;
private String superClass;
private String currentNewClass;
private static final int MULTIANEWARRAY = 197;
private static final int ALOAD_0 = 42;
private static final int WIDE = 196;
private static final int INVOKEINTERFACE = 185;
private static final int TABLESWITCH = 170;
private static final int IINC = 132;
private static final int LOOKUPSWITCH = 171;
private static final int endMarker = 255;
private final IntList bciRenumbering = new IntList();
private final Map labelsToOffsets = new HashMap();
private int byteCodeOffset;
private int renumberedOffset;
private final IntList bcLabelRelativeOffsets = new IntList();
public void setCurrentClass(String name, String superName) {
currentClass = name;
superClass = superName;
}
/**
* All input classes for the segment have now been read in, so this method
* is called so that this class can calculate/complete anything it could not
* do while classes were being read.
*/
public void finaliseBands() {
bcThisField = getIndexInClass(bcThisField);
bcThisMethod = getIndexInClass(bcThisMethod);
bcSuperMethod = getIndexInClass(bcSuperMethod);
bcInitRef = getIndexInClassForConstructor(bcInitRef);
}
public void pack(OutputStream out) throws IOException, Pack200Exception {
PackingUtils.log("Writing byte code bands...");
byte[] encodedBand = encodeBandInt("bcCodes", bcCodes.toArray(),
Codec.BYTE1);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length + " bytes from bcCodes["
+ bcCodes.size() + "]");
encodedBand = encodeBandInt("bcCaseCount", bcCaseCount.toArray(),
Codec.UNSIGNED5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length
+ " bytes from bcCaseCount[" + bcCaseCount.size() + "]");
encodedBand = encodeBandInt("bcCaseValue", bcCaseValue.toArray(),
Codec.DELTA5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length
+ " bytes from bcCaseValue[" + bcCaseValue.size() + "]");
encodedBand = encodeBandInt("bcByte", bcByte.toArray(), Codec.BYTE1);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length + " bytes from bcByte["
+ bcByte.size() + "]");
encodedBand = encodeBandInt("bcShort", bcShort.toArray(), Codec.DELTA5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length + " bytes from bcShort["
+ bcShort.size() + "]");
encodedBand = encodeBandInt("bcLocal", bcLocal.toArray(),
Codec.UNSIGNED5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length + " bytes from bcLocal["
+ bcLocal.size() + "]");
encodedBand = encodeBandInt("bcLabel", integerListToArray(bcLabel),
Codec.BRANCH5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length + " bytes from bcLabel["
+ bcLabel.size() + "]");
encodedBand = encodeBandInt("bcIntref", cpEntryListToArray(bcIntref),
Codec.DELTA5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length
+ " bytes from bcIntref[" + bcIntref.size() + "]");
encodedBand = encodeBandInt("bcFloatRef",
cpEntryListToArray(bcFloatRef), Codec.DELTA5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length
+ " bytes from bcFloatRef[" + bcFloatRef.size() + "]");
encodedBand = encodeBandInt("bcLongRef", cpEntryListToArray(bcLongRef),
Codec.DELTA5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length
+ " bytes from bcLongRef[" + bcLongRef.size() + "]");
encodedBand = encodeBandInt("bcDoubleRef",
cpEntryListToArray(bcDoubleRef), Codec.DELTA5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length
+ " bytes from bcDoubleRef[" + bcDoubleRef.size() + "]");
encodedBand = encodeBandInt("bcStringRef",
cpEntryListToArray(bcStringRef), Codec.DELTA5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length
+ " bytes from bcStringRef[" + bcStringRef.size() + "]");
encodedBand = encodeBandInt("bcClassRef",
cpEntryOrNullListToArray(bcClassRef), Codec.UNSIGNED5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length
+ " bytes from bcClassRef[" + bcClassRef.size() + "]");
encodedBand = encodeBandInt("bcFieldRef",
cpEntryListToArray(bcFieldRef), Codec.DELTA5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length
+ " bytes from bcFieldRef[" + bcFieldRef.size() + "]");
encodedBand = encodeBandInt("bcMethodRef",
cpEntryListToArray(bcMethodRef), Codec.UNSIGNED5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length
+ " bytes from bcMethodRef[" + bcMethodRef.size() + "]");
encodedBand = encodeBandInt("bcIMethodRef",
cpEntryListToArray(bcIMethodRef), Codec.DELTA5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length
+ " bytes from bcIMethodRef[" + bcIMethodRef.size() + "]");
encodedBand = encodeBandInt("bcThisField",
integerListToArray(bcThisField), Codec.UNSIGNED5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length
+ " bytes from bcThisField[" + bcThisField.size() + "]");
encodedBand = encodeBandInt("bcSuperField",
integerListToArray(bcSuperField), Codec.UNSIGNED5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length
+ " bytes from bcSuperField[" + bcSuperField.size() + "]");
encodedBand = encodeBandInt("bcThisMethod",
integerListToArray(bcThisMethod), Codec.UNSIGNED5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length
+ " bytes from bcThisMethod[" + bcThisMethod.size() + "]");
encodedBand = encodeBandInt("bcSuperMethod",
integerListToArray(bcSuperMethod), Codec.UNSIGNED5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length
+ " bytes from bcSuperMethod[" + bcSuperMethod.size() + "]");
encodedBand = encodeBandInt("bcInitRef", integerListToArray(bcInitRef),
Codec.UNSIGNED5);
out.write(encodedBand);
PackingUtils.log("Wrote " + encodedBand.length
+ " bytes from bcInitRef[" + bcInitRef.size() + "]");
// out.write(encodeBandInt(cpEntryintegerListToArray(bcEscRef),
// Codec.UNSIGNED5));
// out.write(encodeBandInt(integerListToArray(bcEscRefSize),
// Codec.UNSIGNED5));
// out.write(encodeBandInt(integerListToArray(bcEscSize),
// Codec.UNSIGNED5));
// out.write(encodeBandInt(integerListToArray(bcEscByte), Codec.BYTE1));
}
private List getIndexInClass(List cPMethodOrFieldList) {
List indices = new ArrayList(cPMethodOrFieldList.size());
for (int i = 0; i < cPMethodOrFieldList.size(); i++) {
CPMethodOrField cpMF = (CPMethodOrField) cPMethodOrFieldList.get(i);
indices.add(new Integer(cpMF.getIndexInClass()));
}
return indices;
}
private List getIndexInClassForConstructor(List cPMethodList) {
List indices = new ArrayList(cPMethodList.size());
for (int i = 0; i < cPMethodList.size(); i++) {
CPMethodOrField cpMF = (CPMethodOrField) cPMethodList.get(i);
indices.add(new Integer(cpMF.getIndexInClassForConstructor()));
}
return indices;
}
public void visitEnd() {
for (int i = 0; i < bciRenumbering.size(); i++) {
if (bciRenumbering.get(i) == -1) {
bciRenumbering.remove(i);
bciRenumbering.add(i, ++renumberedOffset);
}
}
if (renumberedOffset != 0) {
if(renumberedOffset + 1 != bciRenumbering.size()) {
throw new RuntimeException("Mistake made with renumbering");
}
for (int i = bcLabel.size() - 1; i >= 0; i--) {
Object label = bcLabel.get(i);
if (label instanceof Integer) {
break;
} else if (label instanceof Label) {
bcLabel.remove(i);
Integer offset = (Integer) labelsToOffsets.get(label);
int relativeOffset = bcLabelRelativeOffsets.get(i);
bcLabel.add(i, new Integer(bciRenumbering.get(offset.intValue()) - bciRenumbering.get(relativeOffset)));
}
}
bcCodes.add(endMarker);
segment.getClassBands().doBciRenumbering(bciRenumbering,
labelsToOffsets);
bciRenumbering.clear();
labelsToOffsets.clear();
byteCodeOffset = 0;
renumberedOffset = 0;
}
}
public void visitLabel(Label label) {
labelsToOffsets.put(label, new Integer(byteCodeOffset));
}
public void visitFieldInsn(int opcode, String owner, String name,
String desc) {
byteCodeOffset += 3;
updateRenumbering();
boolean aload_0 = false;
if (bcCodes.size() > 0
&& (bcCodes.get(bcCodes.size() - 1)) == ALOAD_0) {
bcCodes.remove(bcCodes.size() - 1);
aload_0 = true;
}
CPMethodOrField cpField = cpBands.getCPField(owner, name, desc);
if (aload_0) {
opcode += 7;
}
if (owner.equals(currentClass)) {
opcode += 24; // change to getstatic_this, putstatic_this etc.
bcThisField.add(cpField);
// } else if (owner.equals(superClass)) {
// opcode += 38; // change to getstatic_super etc.
// bcSuperField.add(cpField);
} else {
if (aload_0) {
opcode -= 7;
bcCodes.add(ALOAD_0); // add aload_0 back in because
// there's no special rewrite in
// this case.
}
bcFieldRef.add(cpField);
}
aload_0 = false;
bcCodes.add(opcode);
}
private void updateRenumbering() {
if(bciRenumbering.isEmpty()) {
bciRenumbering.add(0);
}
renumberedOffset ++;
for (int i = bciRenumbering.size(); i < byteCodeOffset; i++) {
bciRenumbering.add(-1);
}
bciRenumbering.add(renumberedOffset);
}
public void visitIincInsn(int var, int increment) {
if (var > 255 || increment > 255) {
byteCodeOffset += 6;
bcCodes.add(WIDE);
bcCodes.add(IINC);
bcLocal.add(var);
bcShort.add(increment);
} else {
byteCodeOffset += 3;
bcCodes.add(IINC);
bcLocal.add(var);
bcByte.add(increment & 0xFF);
}
updateRenumbering();
}
public void visitInsn(int opcode) {
if (opcode >= 202) {
throw new RuntimeException(
"Non-standard bytecode instructions not supported");
} else {
bcCodes.add(opcode);
byteCodeOffset++;
updateRenumbering();
}
}
public void visitIntInsn(int opcode, int operand) {
switch (opcode) {
case 17: // sipush
bcCodes.add(opcode);
bcShort.add(operand);
byteCodeOffset += 3;
break;
case 16: // bipush
case 188: // newarray
bcCodes.add(opcode);
bcByte.add(operand & 0xFF);
byteCodeOffset += 2;
}
updateRenumbering();
}
public void visitJumpInsn(int opcode, Label label) {
bcCodes.add(opcode);
bcLabel.add(label);
bcLabelRelativeOffsets.add(byteCodeOffset);
byteCodeOffset += 3;
updateRenumbering();
}
public void visitLdcInsn(Object cst) {
CPConstant constant = cpBands.getConstant(cst);
if (segment.lastConstantHadWideIndex() || constant instanceof CPLong
|| constant instanceof CPDouble) {
byteCodeOffset += 3;
if (constant instanceof CPInt) {
bcCodes.add(237); // ildc_w
bcIntref.add(constant);
} else if (constant instanceof CPFloat) {
bcCodes.add(238); // fldc
bcFloatRef.add(constant);
} else if (constant instanceof CPLong) {
bcCodes.add(20); // lldc2_w
bcLongRef.add(constant);
} else if (constant instanceof CPDouble) {
bcCodes.add(239); // dldc2_w
bcDoubleRef.add(constant);
} else if (constant instanceof CPString) {
bcCodes.add(19); // aldc
bcStringRef.add(constant);
} else if (constant instanceof CPClass) {
bcCodes.add(236); // cldc
bcClassRef.add(constant);
} else {
throw new RuntimeException("Constant should not be null");
}
} else {
byteCodeOffset += 2;
if (constant instanceof CPInt) {
bcCodes.add(234); // ildc
bcIntref.add(constant);
} else if (constant instanceof CPFloat) {
bcCodes.add(235); // fldc
bcFloatRef.add(constant);
} else if (constant instanceof CPString) {
bcCodes.add(18); // aldc
bcStringRef.add(constant);
} else if (constant instanceof CPClass) {
bcCodes.add(233); // cldc
bcClassRef.add(constant);
}
}
updateRenumbering();
}
public void visitLookupSwitchInsn(Label dflt, int[] keys, Label[] labels) {
bcCodes.add(LOOKUPSWITCH);
bcLabel.add(dflt);
bcLabelRelativeOffsets.add(byteCodeOffset);
bcCaseCount.add(keys.length);
for (int i = 0; i < labels.length; i++) {
bcCaseValue.add(keys[i]);
bcLabel.add(labels[i]);
bcLabelRelativeOffsets.add(byteCodeOffset);
}
int padding = (byteCodeOffset + 1) % 4 == 0 ? 0 : 4 - ((byteCodeOffset + 1) % 4);
byteCodeOffset += padding + 8 + 8 * keys.length;
updateRenumbering();
}
public void visitMethodInsn(int opcode, String owner, String name,
String desc) {
byteCodeOffset += 3;
updateRenumbering();
switch (opcode) {
case 182: // invokevirtual
case 183: // invokespecial
case 184: // invokestatic
boolean aload_0 = false;
if (bcCodes.size() > 0
&& (bcCodes.get(bcCodes.size() - 1))
== (ALOAD_0)) {
bcCodes.remove(bcCodes.size() - 1);
aload_0 = true;
opcode += 7;
}
if (owner.equals(currentClass)) {
opcode += 24; // change to invokevirtual_this,
// invokespecial_this etc.
if(name.equals("<init>") && opcode == 207) {
opcode = 230; // invokespecial_this_init
bcInitRef.add(cpBands.getCPMethod(owner, name, desc));
} else {
bcThisMethod.add(cpBands.getCPMethod(owner, name, desc));
}
} else if (owner.equals(superClass)) { // TODO
opcode += 38; // change to invokevirtual_super,
// invokespecial_super etc.
if(name.equals("<init>") && opcode == 221) {
opcode = 231; // invokespecial_super_init
bcInitRef.add(cpBands.getCPMethod(owner, name, desc));
} else {
bcSuperMethod.add(cpBands.getCPMethod(owner, name, desc));
}
} else {
if (aload_0) {
opcode -= 7;
bcCodes.add(ALOAD_0); // add aload_0 back in
// because there's no
// special rewrite in this
// case.
}
if(name.equals("<init>") && opcode == 183 && owner.equals(currentNewClass)) {
opcode = 232; // invokespecial_new_init
bcInitRef.add(cpBands.getCPMethod(owner, name, desc));
} else {
bcMethodRef.add(cpBands.getCPMethod(owner, name, desc));
}
}
bcCodes.add(opcode);
break;
case 185: // invokeinterface
CPMethodOrField cpIMethod = cpBands.getCPIMethod(owner, name, desc);
bcIMethodRef.add(cpIMethod);
bcCodes.add(INVOKEINTERFACE);
break;
}
}
public void visitMultiANewArrayInsn(String desc, int dimensions) {
byteCodeOffset += 4;
updateRenumbering();
bcCodes.add(MULTIANEWARRAY);
bcClassRef.add(cpBands.getCPClass(desc));
bcByte.add(dimensions & 0xFF);
}
public void visitTableSwitchInsn(int min, int max, Label dflt,
Label[] labels) {
bcCodes.add(TABLESWITCH);
bcLabel.add(dflt);
bcLabelRelativeOffsets.add(byteCodeOffset);
bcCaseValue.add(min);
int count = labels.length;
bcCaseCount.add(count);
for (int i = 0; i < count; i++) {
bcLabel.add(labels[i]);
bcLabelRelativeOffsets.add(byteCodeOffset);
}
int padding = (byteCodeOffset + 1) % 4 == 0 ? 0 : 4 - ((byteCodeOffset + 1) % 4);
byteCodeOffset+= (padding + 12 + 4 * labels.length);
updateRenumbering();
}
public void visitTypeInsn(int opcode, String type) {
// NEW, ANEWARRAY, CHECKCAST or INSTANCEOF
byteCodeOffset += 3;
updateRenumbering();
bcCodes.add(opcode);
bcClassRef.add(cpBands.getCPClass(type));
if(opcode == 187) { // NEW
currentNewClass = type;
}
}
public void visitVarInsn(int opcode, int var) {
// ILOAD, LLOAD, FLOAD, DLOAD, ALOAD, ISTORE, LSTORE, FSTORE, DSTORE, ASTORE or RET
if (var > 255) {
byteCodeOffset += 4;
bcCodes.add(WIDE);
bcCodes.add(opcode);
bcLocal.add(var);
} else {
if(var > 3 || opcode == 169 /* RET */) {
byteCodeOffset += 2;
bcCodes.add(opcode);
bcLocal.add(var);
} else {
byteCodeOffset +=1;
switch(opcode) {
case 21: // ILOAD
case 54: // ISTORE
bcCodes.add(opcode + 5 + var);
break;
case 22: // LLOAD
case 55: // LSTORE
bcCodes.add(opcode + 8 + var);
break;
case 23: // FLOAD
case 56: // FSTORE
bcCodes.add(opcode + 11 + var);
break;
case 24: // DLOAD
case 57: // DSTORE
bcCodes.add(opcode + 14 + var);
break;
case 25: // A_LOAD
case 58: // A_STORE
bcCodes.add(opcode + 17 + var);
break;
}
}
}
updateRenumbering();
}
}
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