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/*
* JBoss, Home of Professional Open Source.
*
* Copyright 2012 Red Hat, Inc.
*
* Licensed 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.jboss.classfilewriter.code;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.jboss.classfilewriter.ClassMethod;
import org.jboss.classfilewriter.InvalidBytecodeException;
import org.jboss.classfilewriter.attributes.Attribute;
import org.jboss.classfilewriter.attributes.StackMapTableAttribute;
import org.jboss.classfilewriter.constpool.ConstPool;
import org.jboss.classfilewriter.util.ByteArrayDataOutputStream;
import org.jboss.classfilewriter.util.DescriptorUtils;
import org.jboss.classfilewriter.util.LazySize;
public class CodeAttribute extends Attribute {
public static final String NAME = "Code";
private final ClassMethod method;
private final ConstPool constPool;
private final ByteArrayOutputStream finalDataBytes;
private final DataOutputStream data;
private int maxLocals = 0;
private int maxStackDepth = 0;
private final LinkedHashMap stackFrames = new LinkedHashMap();
/**
* maps bytecode offsets to jump locations. As these jump locations where not known when the instruction was written they
* need to be overwritten when the final bytecode is written out
*/
private final Map jumpLocations = new HashMap();
/**
* maps bytecode offsets to jump locations. As these jump locations where not known when the instruction was written they
* need to be overwritten when the final bytecode is written out
*
* These jump locations are 32 bit offsets,
*/
private final Map jumpLocations32 = new HashMap();
private StackFrame currentFrame;
private int currentOffset;
private final List attributes = new ArrayList();
//disable for now, as this has some issues
private boolean stackMapAttributeValid = false;
private final StackMapTableAttribute stackMapTableAttribute;
private final List exceptionTable = new ArrayList();
public CodeAttribute(ClassMethod method, ConstPool constPool) {
super(NAME, constPool);
this.method = method;
this.constPool = constPool;
this.finalDataBytes = new ByteArrayOutputStream();
this.data = new DataOutputStream(finalDataBytes);
if (!Modifier.isStatic(method.getAccessFlags())) {
maxLocals++;
}
for (String param : method.getParameters()) {
if (DescriptorUtils.isWide(param)) {
maxLocals += 2;
} else {
maxLocals++;
}
}
// creates a new initial stack frame
currentFrame = new StackFrame(method);
stackFrames.put(0, currentFrame);
currentOffset = 0;
stackMapTableAttribute = new StackMapTableAttribute(method, constPool);
}
@Override
public void writeData(ByteArrayDataOutputStream stream) throws IOException {
if (stackMapAttributeValid) {
// add the stack map table
attributes.add(stackMapTableAttribute);
}
if (finalDataBytes.size() == 0) {
throw new RuntimeException("Code attribute is empty for method " + method.getName() + " " + method.getDescriptor());
}
byte[] bytecode = finalDataBytes.toByteArray();
for (Entry e : jumpLocations.entrySet()) {
overwriteShort(bytecode, e.getKey(), e.getValue());
}
for (Entry e : jumpLocations32.entrySet()) {
overwriteInt(bytecode, e.getKey(), e.getValue());
}
LazySize size = stream.writeSize();
stream.writeShort(maxStackDepth);
stream.writeShort(maxLocals);
stream.writeInt(bytecode.length);
stream.write(bytecode);
stream.writeShort(exceptionTable.size()); // exception table length
for (ExceptionHandler exception : exceptionTable) {
stream.writeShort(exception.getStart());
stream.writeShort(exception.getEnd());
stream.writeShort(exception.getHandler());
stream.writeShort(exception.getExceptionIndex());
}
stream.writeShort(attributes.size()); // attributes count
for (Attribute attribute : attributes) {
attribute.write(stream);
}
size.markEnd();
;
}
// -------------------------------------------
// Instruction methods, in alphabetical order
public void aaload() {
assertTypeOnStack(StackEntryType.INT, "aaload requires int on top of stack");
if (!getStack().top_1().getDescriptor().startsWith("[")) {
throw new InvalidBytecodeException("aaload needs an array in position 2 on the stack");
}
writeByte(Opcode.AALOAD);
currentOffset++;
advanceFrame(currentFrame.pop2push1("Ljava/lang/Object;"));
}
public void aastore() {
assertTypeOnStack(StackEntryType.OBJECT, "aastore requires reference type on top of stack");
assertTypeOnStack(1, StackEntryType.INT, "aastore requires an int on position 2 stack");
if (!getStack().top_2().getDescriptor().startsWith("[")) {
throw new InvalidBytecodeException("aaload needs an array in position 3 on the stack");
}
writeByte(Opcode.AASTORE);
currentOffset++;
advanceFrame(currentFrame.pop3());
}
public void aconstNull() {
writeByte(Opcode.ACONST_NULL);
currentOffset++;
advanceFrame(currentFrame.aconstNull());
}
public void aload(int no) {
LocalVariableState locals = getLocalVars();
if (locals.size() <= no) {
throw new InvalidBytecodeException("Cannot load variable at " + no + ". Local Variables: " + locals.toString());
}
StackEntry entry = locals.get(no);
if (entry.getType() != StackEntryType.OBJECT && entry.getType() != StackEntryType.NULL
&& entry.getType() != StackEntryType.UNINITIALIZED_THIS
&& entry.getType() != StackEntryType.UNITITIALIZED_OBJECT) {
throw new InvalidBytecodeException("Invalid local variable at location " + no + " Local Variables "
+ locals.toString());
}
if (no > 0xFF) {
// wide version
writeByte(Opcode.WIDE);
writeByte(Opcode.ALOAD);
writeShort(no);
currentOffset += 4;
} else if (no >= 0 && no < 4) {
writeByte(Opcode.ALOAD_0 + no);
currentOffset++;
} else {
writeByte(Opcode.ALOAD);
writeByte(no);
currentOffset += 2;
}
advanceFrame(currentFrame.push(entry));
}
public void anewarray(String arrayType) {
assertTypeOnStack(StackEntryType.INT, "anewarray requires int on stack");
int index = constPool.addClassEntry(arrayType);
writeByte(Opcode.ANEWARRAY);
writeShort(index);
currentOffset += 3;
if (arrayType.startsWith("[")) {
advanceFrame(currentFrame.replace("[" + arrayType));
} else {
advanceFrame(currentFrame.replace("[L" + arrayType + ";"));
}
}
public void arraylength() {
assertTypeOnStack(StackEntryType.OBJECT, "arraylength requires array on stack");
writeByte(Opcode.ARRAYLENGTH);
currentOffset++;
advanceFrame(currentFrame.replace("I"));
}
public void astore(int no) {
assertTypeOnStack(StackEntryType.OBJECT, "aastore requires reference type on stack");
if (no > 0xFF) {
// wide version
writeByte(Opcode.WIDE);
writeByte(Opcode.ASTORE);
writeShort(no);
currentOffset += 4;
} else if (no >= 0 && no < 4) {
writeByte(Opcode.ASTORE_0 + no);
currentOffset++;
} else {
writeByte(Opcode.ASTORE);
writeByte(no);
currentOffset += 2;
}
advanceFrame(currentFrame.store(no));
}
public void athrow() {
assertTypeOnStack(StackEntryType.OBJECT, "athrow requires an object on the stack");
writeByte(Opcode.ATHROW);
currentOffset++;
currentFrame = null;
}
public void baload() {
assertTypeOnStack(StackEntryType.INT, "baload requires an int on top of the stack");
assertTypeOnStack(1, StackEntryType.OBJECT, "baload requires an array in position 2 on the stack");
writeByte(Opcode.BALOAD);
currentOffset++;
advanceFrame(currentFrame.pop2push1("I"));
}
public void bastore() {
assertTypeOnStack(StackEntryType.INT, "bastore requires an int on top of the stack");
assertTypeOnStack(1, StackEntryType.INT, "bastore requires an int in position 2 on the stack");
assertTypeOnStack(2, StackEntryType.OBJECT, "bastore requires an array reference in position 3 on the stack");
writeByte(Opcode.BASTORE);
currentOffset++;
advanceFrame(currentFrame.pop3());
}
public void caload() {
assertTypeOnStack(StackEntryType.INT, "caload requires an int on top of the stack");
assertTypeOnStack(1, StackEntryType.OBJECT, "caload requires an array in position 2 on the stack");
writeByte(Opcode.CALOAD);
currentOffset++;
advanceFrame(currentFrame.pop2push1("I"));
}
public void castore() {
assertTypeOnStack(StackEntryType.INT, "castore requires an int on top of the stack");
assertTypeOnStack(1, StackEntryType.INT, "castore requires an int in position 2 on the stack");
assertTypeOnStack(2, StackEntryType.OBJECT, "castore requires an array reference in position 3 on the stack");
writeByte(Opcode.CASTORE);
currentOffset++;
advanceFrame(currentFrame.pop3());
}
public void bipush(byte value) {
writeByte(Opcode.BIPUSH);
writeByte(value);
currentOffset += 2;
advanceFrame(currentFrame.push("B"));
}
/**
* marks the end of a branch. The current stack frame is checked for compatibility with the stack frame at the branch start
*/
public void branchEnd(BranchEnd end) {
mergeStackFrames(end.getStackFrame());
final int jump = currentOffset - end.getOffsetLocation();
if (end.isJump32Bit()) {
jumpLocations32.put(end.getBranchLocation(), jump);
} else {
if(jump > Short.MAX_VALUE) {
throw new RuntimeException(jump + " is to big to be written as a 16 bit value");
}
jumpLocations.put(end.getBranchLocation(), jump);
}
}
/**
* Do not use Descriptor format (e.g. Ljava/lang/Object;), the correct form is just java/lang/Object or java.lang.Object
*/
public void checkcast(String className) {
assertTypeOnStack(StackEntryType.OBJECT, "checkcast requires reference type on stack");
int classIndex = constPool.addClassEntry(className);
writeByte(Opcode.CHECKCAST);
writeShort(classIndex);
currentOffset += 3;
advanceFrame(currentFrame.replace(className));
}
public void checkcast(Class clazz) {
checkcast(clazz.getName());
}
public void d2f() {
assertTypeOnStack(StackEntryType.DOUBLE, "d2f requires double on stack");
writeByte(Opcode.D2F);
currentOffset++;
advanceFrame(currentFrame.pop2push1("F"));
}
public void d2i() {
assertTypeOnStack(StackEntryType.DOUBLE, "d2i requires double on stack");
writeByte(Opcode.D2I);
currentOffset++;
advanceFrame(currentFrame.pop2push1("I"));
}
public void d2l() {
assertTypeOnStack(StackEntryType.DOUBLE, "d2l requires double on stack");
writeByte(Opcode.D2L);
currentOffset++;
advanceFrame(currentFrame.pop2push1("J"));
}
public void dadd() {
assertTypeOnStack(StackEntryType.DOUBLE, "dadd requires double on stack");
assertTypeOnStack(2, StackEntryType.DOUBLE, "dadd requires double on stack");
writeByte(Opcode.DADD);
currentOffset++;
advanceFrame(currentFrame.pop2());
}
public void daload() {
assertTypeOnStack(StackEntryType.INT, "daload requires an int on top of the stack");
assertTypeOnStack(1, StackEntryType.OBJECT, "daload requires an array in position 2 on the stack");
writeByte(Opcode.DALOAD);
currentOffset++;
advanceFrame(currentFrame.pop2push1("D"));
}
public void dastore() {
assertTypeOnStack(StackEntryType.DOUBLE, "dastore requires an int on top of the stack");
assertTypeOnStack(2, StackEntryType.INT, "dastore requires an int in position 2 on the stack");
assertTypeOnStack(3, StackEntryType.OBJECT, "dastore requires an array reference in position 3 on the stack");
writeByte(Opcode.DASTORE);
currentOffset++;
advanceFrame(currentFrame.pop4());
}
public void dcmpg() {
assertTypeOnStack(StackEntryType.DOUBLE, "dcmpg requires double on stack");
assertTypeOnStack(2, StackEntryType.DOUBLE, "dcmpg requires double on stack");
writeByte(Opcode.DCMPG);
currentOffset++;
advanceFrame(currentFrame.pop4push1("I"));
}
public void dcmpl() {
assertTypeOnStack(StackEntryType.DOUBLE, "dcmpl requires double on stack");
assertTypeOnStack(2, StackEntryType.DOUBLE, "dcmpl requires double in position 3 on stack");
writeByte(Opcode.DCMPL);
currentOffset++;
advanceFrame(currentFrame.pop4push1("I"));
}
/**
* Adds the appropriate dconst instruction.
*
* note, if the value is not 0 or 1 then ldc is used instead
*/
public void dconst(double value) {
if (value == 0.0) {
writeByte(Opcode.DCONST_0);
} else if (value == 1.0) {
writeByte(Opcode.DCONST_1);
} else {
ldc2(value);
return;
}
currentOffset++;
advanceFrame(currentFrame.push("D"));
}
public void ddiv() {
assertTypeOnStack(StackEntryType.DOUBLE, "ddiv requires double on stack");
assertTypeOnStack(2, StackEntryType.DOUBLE, "ddiv requires double in position 3 on stack");
writeByte(Opcode.DDIV);
currentOffset++;
advanceFrame(currentFrame.pop2());
}
public void dload(int no) {
LocalVariableState locals = getLocalVars();
if (locals.size() <= no) {
throw new InvalidBytecodeException("Cannot load variable at " + no + ". Local Variables: " + locals.toString());
}
StackEntry entry = locals.get(no);
if (entry.getType() != StackEntryType.DOUBLE) {
throw new InvalidBytecodeException("Invalid local variable at location " + no + " Local Variables "
+ locals.toString());
}
if (no > 0xFF) {
// wide version
writeByte(Opcode.WIDE);
writeByte(Opcode.DLOAD);
writeShort(no);
currentOffset += 4;
} else if (no >= 0 && no < 4) {
writeByte(Opcode.DLOAD_0 + no);
currentOffset++;
} else {
writeByte(Opcode.DLOAD);
writeByte(no);
currentOffset += 2;
}
advanceFrame(currentFrame.push(entry));
}
public void dmul() {
assertTypeOnStack(StackEntryType.DOUBLE, "dmul requires double on stack");
assertTypeOnStack(2, StackEntryType.DOUBLE, "dmul requires double in position 3 on stack");
writeByte(Opcode.DMUL);
currentOffset++;
advanceFrame(currentFrame.pop2());
}
public void dneg() {
assertTypeOnStack(StackEntryType.DOUBLE, "dneg requires double on stack");
writeByte(Opcode.DNEG);
currentOffset++;
duplicateFrame();
}
public void drem() {
assertTypeOnStack(StackEntryType.DOUBLE, "drem requires double on stack");
assertTypeOnStack(2, StackEntryType.DOUBLE, "drem requires double in position 3 on stack");
writeByte(Opcode.DREM);
currentOffset++;
advanceFrame(currentFrame.pop2());
}
public void dstore(int no) {
assertTypeOnStack(StackEntryType.DOUBLE, "dastore requires double on stack");
if (no > 0xFF) {
// wide version
writeByte(Opcode.WIDE);
writeByte(Opcode.DSTORE);
writeShort(no);
currentOffset += 4;
} else if (no >= 0 && no < 4) {
writeByte(Opcode.DSTORE_0 + no);
currentOffset++;
} else {
writeByte(Opcode.DSTORE);
writeByte(no);
currentOffset += 2;
}
advanceFrame(currentFrame.store(no));
}
public void dsub() {
assertTypeOnStack(StackEntryType.DOUBLE, "dsub requires double on stack");
assertTypeOnStack(2, StackEntryType.DOUBLE, "dsub requires double in position 3 on stack");
writeByte(Opcode.DSUB);
currentOffset++;
advanceFrame(currentFrame.pop2());
}
public void dup() {
assertNotWideOnStack("dup acnnot be used if double or long is on top of the stack");
writeByte(Opcode.DUP);
currentOffset++;
advanceFrame(currentFrame.dup());
}
public void dupX1() {
assertNotWideOnStack("dup_x1 cannot be used if double or long is on top of the stack");
assertNotWideOnStack(1, "dup_x1 cannot be used if double or long is in position 2 on the stack");
writeByte(Opcode.DUP_X1);
currentOffset++;
advanceFrame(currentFrame.dupX1());
}
public void dupX2() {
assertNotWideOnStack("dup_x2 acnnot be used if double or long is on top of the stack");
writeByte(Opcode.DUP_X2);
currentOffset++;
advanceFrame(currentFrame.dupX2());
}
public void dup2() {
writeByte(Opcode.DUP2);
currentOffset++;
advanceFrame(currentFrame.dup2());
}
public void dup2X1() {
assertNotWideOnStack(2, "dup2_x1 cannot be used if double or long is in position 3 on the stack");
writeByte(Opcode.DUP2_X1);
currentOffset++;
advanceFrame(currentFrame.dup2X1());
}
public void dup2X2() {
assertNotWideOnStack(3, "dup2_x2 cannot be used if double or long is in position 4 on the stack");
writeByte(Opcode.DUP2_X2);
currentOffset++;
advanceFrame(currentFrame.dup2X2());
}
/**
* Begin writing an exception handler block. The handler is not actually persisted until exceptionHandler is called.
*/
public ExceptionHandler exceptionBlockStart(String exceptionType) {
ExceptionHandler handler = new ExceptionHandler(currentOffset, constPool.addClassEntry(exceptionType), exceptionType,
currentFrame);
return handler;
}
/**
* Mark the end of an exception handler block. The last instruction that was written will be the last instruction covered by
* the handler
*/
public void exceptionBlockEnd(ExceptionHandler handler) {
handler.setEnd(currentOffset);
}
/**
* Marks the current code location as the exception handler and adds the handler to the exception handler table;
*/
public void exceptionHandlerStart(ExceptionHandler handler) {
if (handler.getEnd() == 0) {
throw new InvalidBytecodeException(
"handler end location must be initialised via exceptionHandlerEnd before calling exceptionHandlerAdd");
}
handler.setHandler(currentOffset);
exceptionTable.add(handler);
mergeStackFrames(new StackFrame(new StackState(handler.getExceptionType(), constPool), handler.getFrame()
.getLocalVariableState(), StackFrameType.FULL_FRAME));
}
public void f2d() {
assertTypeOnStack(StackEntryType.FLOAT, "f2s requires float on stack");
writeByte(Opcode.F2D);
currentOffset++;
advanceFrame(currentFrame.replace("D"));
}
public void f2i() {
assertTypeOnStack(StackEntryType.FLOAT, "f2i requires float on stack");
writeByte(Opcode.F2I);
currentOffset++;
advanceFrame(currentFrame.replace("I"));
}
public void f2l() {
assertTypeOnStack(StackEntryType.FLOAT, "f2l requires float on stack");
writeByte(Opcode.F2L);
currentOffset++;
advanceFrame(currentFrame.replace("J"));
}
public void fadd() {
assertTypeOnStack(StackEntryType.FLOAT, "fadd requires float on stack");
assertTypeOnStack(1, StackEntryType.FLOAT, "fadd requires float on stack");
writeByte(Opcode.FADD);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void faload() {
assertTypeOnStack(StackEntryType.INT, "faload requires an int on top of the stack");
assertTypeOnStack(1, StackEntryType.OBJECT, "faload requires an array in position 2 on the stack");
writeByte(Opcode.FALOAD);
currentOffset++;
advanceFrame(currentFrame.pop2push1("F"));
}
public void fastore() {
assertTypeOnStack(StackEntryType.FLOAT, "fastore requires an int on top of the stack");
assertTypeOnStack(1, StackEntryType.INT, "fastore requires an int in position 2 on the stack");
assertTypeOnStack(2, StackEntryType.OBJECT, "fastore requires an array reference in position 3 on the stack");
writeByte(Opcode.FASTORE);
currentOffset++;
advanceFrame(currentFrame.pop3());
}
public void fcmpg() {
assertTypeOnStack(StackEntryType.FLOAT, "fcmpg requires float on stack");
assertTypeOnStack(1, StackEntryType.FLOAT, "fcmpg requires float on stack");
writeByte(Opcode.FCMPG);
currentOffset++;
advanceFrame(currentFrame.pop2push1("I"));
}
public void fcmpl() {
assertTypeOnStack(StackEntryType.FLOAT, "fcmpl requires float on stack");
assertTypeOnStack(1, StackEntryType.FLOAT, "fcmpl requires float in position 2 on stack");
writeByte(Opcode.FCMPL);
currentOffset++;
advanceFrame(currentFrame.pop2push1("I"));
}
/**
* Adds the appropriate fconst instruction.
*
* note, if the value is not 0, 1, 2 then ldc is used instead
*/
public void fconst(float value) {
if (value == 0) {
writeByte(Opcode.FCONST_0);
} else if (value == 1) {
writeByte(Opcode.FCONST_1);
} else if (value == 2) {
writeByte(Opcode.FCONST_2);
} else {
ldc(value);
return;
}
currentOffset++;
advanceFrame(currentFrame.push("F"));
}
public void fdiv() {
assertTypeOnStack(StackEntryType.FLOAT, "fdiv requires float on stack");
assertTypeOnStack(1, StackEntryType.FLOAT, "fdiv requires float in position 2 on stack");
writeByte(Opcode.FDIV);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void fload(int no) {
LocalVariableState locals = getLocalVars();
if (locals.size() <= no) {
throw new InvalidBytecodeException("Cannot load variable at " + no + ". Local Variables: " + locals.toString());
}
StackEntry entry = locals.get(no);
if (entry.getType() != StackEntryType.FLOAT) {
throw new InvalidBytecodeException("Invalid local variable at location " + no + " Local Variables "
+ locals.toString());
}
if (no > 0xFF) {
// wide version
writeByte(Opcode.WIDE);
writeByte(Opcode.FLOAD);
writeShort(no);
currentOffset += 4;
} else if (no >= 0 && no < 4) {
writeByte(Opcode.FLOAD_0 + no);
currentOffset++;
} else {
writeByte(Opcode.FLOAD);
writeByte(no);
currentOffset += 2;
}
advanceFrame(currentFrame.push(entry));
}
public void fmul() {
assertTypeOnStack(StackEntryType.FLOAT, "fmul requires float on stack");
assertTypeOnStack(1, StackEntryType.FLOAT, "fmul requires float in position 2 on stack");
writeByte(Opcode.FMUL);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void fneg() {
assertTypeOnStack(StackEntryType.FLOAT, "fneg requires float on stack");
writeByte(Opcode.FNEG);
currentOffset++;
duplicateFrame();
}
public void frem() {
assertTypeOnStack(StackEntryType.FLOAT, "frem requires float on stack");
assertTypeOnStack(1, StackEntryType.FLOAT, "frem requires float in position 2 on stack");
writeByte(Opcode.FREM);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void fstore(int no) {
assertTypeOnStack(StackEntryType.FLOAT, "fstore requires float on stack");
if (no > 0xFF) {
// wide version
writeByte(Opcode.WIDE);
writeByte(Opcode.FSTORE);
writeShort(no);
currentOffset += 4;
} else if (no >= 0 && no < 4) {
writeByte(Opcode.FSTORE_0 + no);
currentOffset++;
} else {
writeByte(Opcode.FSTORE);
writeByte(no);
currentOffset += 2;
}
advanceFrame(currentFrame.store(no));
}
public void fsub() {
assertTypeOnStack(StackEntryType.FLOAT, "fsub requires float on stack");
assertTypeOnStack(1, StackEntryType.FLOAT, "fsub requires float in position 2 on stack");
writeByte(Opcode.FSUB);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void getfield(String className, String field, Class fieldType) {
getfield(className, field, DescriptorUtils.makeDescriptor(fieldType));
}
public void getfield(String className, String field, String descriptor) {
assertTypeOnStack(StackEntryType.OBJECT, "getfield requires object on stack");
int index = constPool.addFieldEntry(className, field, descriptor);
writeByte(Opcode.GETFIELD);
writeShort(index);
currentOffset += 3;
advanceFrame(currentFrame.replace(descriptor));
}
public void getstatic(String className, String field, Class fieldType) {
getstatic(className, field, DescriptorUtils.makeDescriptor(fieldType));
}
public void getstatic(String className, String field, String descriptor) {
int index = constPool.addFieldEntry(className, field, descriptor);
writeByte(Opcode.GETSTATIC);
writeShort(index);
currentOffset += 3;
advanceFrame(currentFrame.push(descriptor));
}
/**
* writes a goto instruction.
*
* TODO: implemented goto_w
*/
public void gotoInstruction(CodeLocation location) {
writeByte(Opcode.GOTO);
writeShort(location.getLocation() - currentOffset);
mergeStackFrames(location.getStackFrame());
currentOffset += 3;
currentFrame = null;
}
/**
* writes a goto instruction.
*
* TODO: implemented goto_w
*/
public BranchEnd gotoInstruction() {
writeByte(Opcode.GOTO);
writeShort(0);
currentOffset += 3;
BranchEnd ret = new BranchEnd(currentOffset - 2, currentFrame, currentOffset - 3);
currentFrame = null;
return ret;
}
public void i2b() {
assertTypeOnStack(StackEntryType.INT, "i2b requires int on stack");
writeByte(Opcode.I2B);
currentOffset++;
advanceFrame(currentFrame.replace("B"));
}
public void i2c() {
assertTypeOnStack(StackEntryType.INT, "i2c requires int on stack");
writeByte(Opcode.I2C);
currentOffset++;
advanceFrame(currentFrame.replace("C"));
}
public void i2d() {
assertTypeOnStack(StackEntryType.INT, "i2d requires int on stack");
writeByte(Opcode.I2D);
currentOffset++;
advanceFrame(currentFrame.replace("D"));
}
public void i2f() {
assertTypeOnStack(StackEntryType.INT, "i2f requires int on stack");
writeByte(Opcode.I2F);
currentOffset++;
advanceFrame(currentFrame.replace("F"));
}
public void i2l() {
assertTypeOnStack(StackEntryType.INT, "i2l requires int on stack");
writeByte(Opcode.I2L);
currentOffset++;
advanceFrame(currentFrame.replace("J"));
}
public void i2s() {
assertTypeOnStack(StackEntryType.INT, "i2s requires int on stack");
writeByte(Opcode.I2S);
currentOffset++;
advanceFrame(currentFrame.replace("S"));
}
public void iadd() {
assertTypeOnStack(StackEntryType.INT, "iadd requires int on stack");
assertTypeOnStack(1, StackEntryType.INT, "iadd requires int on stack");
writeByte(Opcode.IADD);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void iaload() {
assertTypeOnStack(StackEntryType.INT, "iaload requires an int on top of the stack");
assertTypeOnStack(1, StackEntryType.OBJECT, "iaload requires an array in position 2 on the stack");
writeByte(Opcode.IALOAD);
currentOffset++;
advanceFrame(currentFrame.pop2push1("I"));
}
public void iand() {
assertTypeOnStack(StackEntryType.INT, "iand requires int on stack");
assertTypeOnStack(1, StackEntryType.INT, "iand requires int on stack");
writeByte(Opcode.IAND);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void iastore() {
assertTypeOnStack(StackEntryType.INT, "iastore requires an int on top of the stack");
assertTypeOnStack(1, StackEntryType.INT, "iastore requires an int in position 2 on the stack");
assertTypeOnStack(2, StackEntryType.OBJECT, "iastore requires an array reference in position 3 on the stack");
writeByte(Opcode.IASTORE);
currentOffset++;
advanceFrame(currentFrame.pop3());
}
/**
* Adds the appropriate iconst instruction.
*
* note, if the value is not in the range -1 to 5 ldc is written instead
*
* @param value
*/
public void iconst(int value) {
if (value < -1 || value > 5) {
if(value < -128 || value > 127) {
ldc(value);
} else {
writeByte(Opcode.BIPUSH);
writeByte(value);
currentOffset+=2;
advanceFrame(currentFrame.push("I"));
}
return;
}
writeByte(Opcode.ICONST_0 + value);
currentOffset++;
advanceFrame(currentFrame.push("I"));
}
public void idiv() {
assertTypeOnStack(StackEntryType.INT, "idiv requires int on stack");
assertTypeOnStack(1, StackEntryType.INT, "idiv requires int in position 2 on stack");
writeByte(Opcode.IDIV);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void ifAcmpeq(CodeLocation location) {
assertTypeOnStack(StackEntryType.OBJECT, "ifAcmpeq requires reference type on stack");
assertTypeOnStack(1, StackEntryType.OBJECT, "ifAcmpeq requires reference type in position 2 on stack");
writeByte(Opcode.IF_ACMPEQ);
writeShort(location.getLocation() - currentOffset);
mergeStackFrames(location.getStackFrame());
currentOffset += 3;
advanceFrame(currentFrame.pop2());
}
public BranchEnd ifAcmpeq() {
assertTypeOnStack(StackEntryType.OBJECT, "ifAcmpeq requires reference type on stack");
assertTypeOnStack(1, StackEntryType.OBJECT, "ifAcmpeq requires reference type int position 2 on stack");
writeByte(Opcode.IF_ACMPEQ);
writeShort(0);
currentOffset += 3;
advanceFrame(currentFrame.pop2());
BranchEnd ret = new BranchEnd(currentOffset - 2, currentFrame, currentOffset - 3);
return ret;
}
public void ifAcmpne(CodeLocation location) {
assertTypeOnStack(StackEntryType.OBJECT, "ifAcmpne requires reference type on stack");
assertTypeOnStack(1, StackEntryType.OBJECT, "ifAcmpne requires reference type in position 2 on stack");
writeByte(Opcode.IF_ACMPNE);
writeShort(location.getLocation() - currentOffset);
mergeStackFrames(location.getStackFrame());
currentOffset += 3;
advanceFrame(currentFrame.pop2());
}
public BranchEnd ifAcmpne() {
assertTypeOnStack(StackEntryType.OBJECT, "ifAcmpne requires reference type on stack");
assertTypeOnStack(1, StackEntryType.OBJECT, "ifAcmpne requires reference type int position 2 on stack");
writeByte(Opcode.IF_ACMPNE);
writeShort(0);
currentOffset += 3;
advanceFrame(currentFrame.pop2());
BranchEnd ret = new BranchEnd(currentOffset - 2, currentFrame, currentOffset - 3);
return ret;
}
public void ifIcmpeq(CodeLocation location) {
addIfIcmp(location, Opcode.IF_ICMPEQ, "ifIcmpeq");
}
public BranchEnd ifIcmpeq() {
return addIfIcmp(Opcode.IF_ICMPEQ, "ifIcmpeq");
}
public void ifIcmpne(CodeLocation location) {
addIfIcmp(location, Opcode.IF_ICMPNE, "ifIcmpne");
}
public BranchEnd ifIcmpne() {
return addIfIcmp(Opcode.IF_ICMPNE, "ifIcmpne");
}
public void ifIcmplt(CodeLocation location) {
addIfIcmp(location, Opcode.IF_ICMPLT, "ifIcmplt");
}
public BranchEnd ifIcmplt() {
return addIfIcmp(Opcode.IF_ICMPLT, "ifIcmplt");
}
public void ifIcmple(CodeLocation location) {
addIfIcmp(location, Opcode.IF_ICMPLE, "ifIcmple");
}
public BranchEnd ifIcmple() {
return addIfIcmp(Opcode.IF_ICMPLE, "ifIcmple");
}
public void ifIcmpgt(CodeLocation location) {
addIfIcmp(location, Opcode.IF_ICMPGT, "ifIcmpgt");
}
public BranchEnd ifIcmpgt() {
return addIfIcmp(Opcode.IF_ICMPGT, "ifIcmpgt");
}
public void ifIcmpge(CodeLocation location) {
addIfIcmp(location, Opcode.IF_ICMPGE, "ifIcmpge");
}
public BranchEnd ifIcmpge() {
return addIfIcmp(Opcode.IF_ICMPGE, "ifIcmpge");
}
public void ifEq(CodeLocation location) {
addIf(location, Opcode.IFEQ, "ifeq");
}
public BranchEnd ifeq() {
return addIf(Opcode.IFEQ, "ifeq");
}
public void ifne(CodeLocation location) {
addIf(location, Opcode.IFNE, "ifne");
}
public BranchEnd ifne() {
return addIf(Opcode.IFNE, "ifne");
}
public void iflt(CodeLocation location) {
addIf(location, Opcode.IFLT, "iflt");
}
public BranchEnd iflt() {
return addIf(Opcode.IFLT, "iflt");
}
public void ifle(CodeLocation location) {
addIf(location, Opcode.IFLE, "ifle");
}
public BranchEnd ifle() {
return addIf(Opcode.IFLE, "ifle");
}
public void ifgt(CodeLocation location) {
addIf(location, Opcode.IFGT, "ifgt");
}
public BranchEnd ifgt() {
return addIf(Opcode.IFGT, "ifgt");
}
public void ifge(CodeLocation location) {
addIf(location, Opcode.IFGE, "ifge");
}
public BranchEnd ifge() {
return addIf(Opcode.IFGE, "ifge");
}
public void ifnotnull(CodeLocation location) {
addNullComparison(location, Opcode.IFNONNULL, "ifnotnull");
}
public BranchEnd ifnotnull() {
return addNullComparison(Opcode.IFNONNULL, "ifnotnull");
}
/**
* Jump to the given location if the reference type on the top of the stack is null
*/
public void ifnull(CodeLocation location) {
addNullComparison(location, Opcode.IFNULL, "ifnull");
}
/**
* Jump to the given location if the reference type on the top of the stack is null.
*
* The {@link BranchEnd} returned from this method is used to set the end point to a future point in the bytecode stream
*/
public BranchEnd ifnull() {
return addNullComparison(Opcode.IFNULL, "ifnull");
}
public void iinc(int local, int amount) {
if (getLocalVars().get(local).getType() != StackEntryType.INT) {
throw new InvalidBytecodeException("iinc requires int at local variable position " + local + " "
+ getLocalVars().toString());
}
if (local > 0xFF || amount > 0xFF) {
writeByte(Opcode.WIDE);
writeByte(Opcode.IINC);
writeShort(local);
writeShort(amount);
currentOffset += 6;
} else {
writeByte(Opcode.IINC);
writeByte(local);
writeByte(amount);
currentOffset += 3;
}
duplicateFrame();
}
public void iload(int no) {
LocalVariableState locals = getLocalVars();
if (locals.size() <= no) {
throw new InvalidBytecodeException("Cannot load variable at " + no + ". Local Variables: " + locals.toString());
}
StackEntry entry = locals.get(no);
if (entry.getType() != StackEntryType.INT) {
throw new InvalidBytecodeException("Invalid local variable at location " + no + " Local Variables "
+ locals.toString());
}
if (no > 0xFF) {
// wide version
writeByte(Opcode.WIDE);
writeByte(Opcode.ILOAD);
writeShort(no);
currentOffset += 4;
} else if (no >= 0 && no < 4) {
writeByte(Opcode.ILOAD_0 + no);
currentOffset++;
} else {
writeByte(Opcode.ILOAD);
writeByte(no);
currentOffset += 2;
}
advanceFrame(currentFrame.push(entry));
}
public void imul() {
assertTypeOnStack(StackEntryType.INT, "imul requires int on stack");
assertTypeOnStack(1, StackEntryType.INT, "imul requires int in position 2 on stack");
writeByte(Opcode.IMUL);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void ineg() {
assertTypeOnStack(StackEntryType.INT, "ineg requires int on stack");
writeByte(Opcode.INEG);
currentOffset++;
duplicateFrame();
}
public void instanceofInstruction(String className) {
assertTypeOnStack(StackEntryType.OBJECT, "instanceof requires an object reference on the stack");
int classIndex = constPool.addClassEntry(className);
writeByte(Opcode.INSTANCEOF);
writeShort(classIndex);
currentOffset += 3;
advanceFrame(currentFrame.replace("I"));
}
public void invokespecial(String className, String methodName, String descriptor) {
String[] params = DescriptorUtils.parameterDescriptors(descriptor);
String returnType = DescriptorUtils.returnType(descriptor);
invokespecial(className, methodName, descriptor, returnType, params);
}
public void invokespecial(String className, String methodName, String returnType, String[] parameterTypes) {
String descriptor = DescriptorUtils.methodDescriptor(parameterTypes, returnType);
invokespecial(className, methodName, descriptor, returnType, parameterTypes);
}
public void invokespecial(Constructor constructor) {
invokespecial(constructor.getDeclaringClass().getName(), "", DescriptorUtils
.makeDescriptor(constructor), "V", DescriptorUtils.parameterDescriptors(constructor.getParameterTypes()));
}
public void invokespecial(Method method) {
if (Modifier.isStatic(method.getModifiers())) {
throw new InvalidBytecodeException("Cannot use invokespacial to invoke a static method");
}
invokespecial(method.getDeclaringClass().getName(), method.getName(), DescriptorUtils.methodDescriptor(method),
DescriptorUtils.makeDescriptor(method.getReturnType()), DescriptorUtils.parameterDescriptors(method
.getParameterTypes()));
}
private void invokespecial(String className, String methodName, String descriptor, String returnType,
String[] parameterTypes) {
// TODO: validate stack
int method = constPool.addMethodEntry(className, methodName, descriptor);
writeByte(Opcode.INVOKESPECIAL);
writeShort(method);
currentOffset += 3;
int pop = 1 + parameterTypes.length;
for (String argument : parameterTypes) {
if (argument.equals("D") || argument.equals("J")) {
pop++;
}
}
if (methodName.equals("")) {
advanceFrame(currentFrame.constructorCall(pop - 1));
} else if (returnType.equals("V")) {
advanceFrame(currentFrame.pop(pop));
} else {
advanceFrame(currentFrame.pop(pop).push(returnType));
}
}
public void invokestatic(String className, String methodName, String descriptor) {
String[] params = DescriptorUtils.parameterDescriptors(descriptor);
String returnType = DescriptorUtils.returnType(descriptor);
invokestatic(className, methodName, descriptor, returnType, params);
}
public void invokestatic(String className, String methodName, String returnType, String[] parameterTypes) {
String descriptor = DescriptorUtils.methodDescriptor(parameterTypes, returnType);
invokestatic(className, methodName, descriptor, returnType, parameterTypes);
}
public void invokestatic(Method method) {
if (!Modifier.isStatic(method.getModifiers())) {
throw new InvalidBytecodeException("Cannot use invokestatic to invoke a non static method");
}
invokestatic(method.getDeclaringClass().getName(), method.getName(), DescriptorUtils.methodDescriptor(method),
DescriptorUtils.makeDescriptor(method.getReturnType()), DescriptorUtils.parameterDescriptors(method
.getParameterTypes()));
}
private void invokestatic(String className, String methodName, String descriptor, String returnType, String[] parameterTypes) {
// TODO: validate stack
int method = constPool.addMethodEntry(className, methodName, descriptor);
writeByte(Opcode.INVOKESTATIC);
writeShort(method);
currentOffset += 3;
int pop = parameterTypes.length;
for (String argument : parameterTypes) {
if (argument.equals("D") || argument.equals("J")) {
pop++;
}
}
if (returnType.equals("V")) {
advanceFrame(currentFrame.pop(pop));
} else {
advanceFrame(currentFrame.pop(pop).push(returnType));
}
}
public void invokevirtual(String className, String methodName, String descriptor) {
String[] params = DescriptorUtils.parameterDescriptors(descriptor);
String returnType = DescriptorUtils.returnType(descriptor);
invokevirtual(className, methodName, descriptor, returnType, params);
}
public void invokevirtual(String className, String methodName, String returnType, String[] parameterTypes) {
String descriptor = DescriptorUtils.methodDescriptor(parameterTypes, returnType);
invokevirtual(className, methodName, descriptor, returnType, parameterTypes);
}
public void invokevirtual(Method method) {
if (Modifier.isStatic(method.getModifiers())) {
throw new InvalidBytecodeException("Cannot use invokevirtual to invoke a static method");
} else if (Modifier.isPrivate(method.getModifiers())) {
throw new InvalidBytecodeException("Cannot use invokevirtual to invoke a private method");
} else if (method.getDeclaringClass().isInterface()) {
throw new InvalidBytecodeException("Cannot use invokevirtual to invoke an interface method");
}
invokevirtual(method.getDeclaringClass().getName(), method.getName(), DescriptorUtils.methodDescriptor(method),
DescriptorUtils.makeDescriptor(method.getReturnType()), DescriptorUtils.parameterDescriptors(method
.getParameterTypes()));
}
private void invokevirtual(String className, String methodName, String descriptor, String returnType,
String[] parameterTypes) {
// TODO: validate stack
int method = constPool.addMethodEntry(className, methodName, descriptor);
writeByte(Opcode.INVOKEVIRTUAL);
writeShort(method);
currentOffset += 3;
int pop = 1 + parameterTypes.length;
for (String argument : parameterTypes) {
if (argument.equals("D") || argument.equals("J")) {
pop++;
}
}
if (returnType.equals("V")) {
advanceFrame(currentFrame.pop(pop));
} else {
advanceFrame(currentFrame.pop(pop).push(returnType));
}
}
public void invokeinterface(String className, String methodName, String descriptor) {
String[] params = DescriptorUtils.parameterDescriptors(descriptor);
String returnType = DescriptorUtils.returnType(descriptor);
invokeinterface(className, methodName, descriptor, returnType, params);
}
public void invokeinterface(String className, String methodName, String returnType, String[] parameterTypes) {
String descriptor = DescriptorUtils.methodDescriptor(parameterTypes, returnType);
invokeinterface(className, methodName, descriptor, returnType, parameterTypes);
}
public void invokeinterface(Method method) {
if (Modifier.isStatic(method.getModifiers())) {
throw new InvalidBytecodeException("Cannot use invokeinterface to invoke a static method");
} else if (Modifier.isPrivate(method.getModifiers())) {
throw new InvalidBytecodeException("Cannot use invokeinterface to invoke a private method");
} else if (!method.getDeclaringClass().isInterface()) {
throw new InvalidBytecodeException("Cannot use invokeinterface to invoke a non interface method");
}
invokeinterface(method.getDeclaringClass().getName(), method.getName(), DescriptorUtils.methodDescriptor(method),
DescriptorUtils.makeDescriptor(method.getReturnType()), DescriptorUtils.parameterDescriptors(method
.getParameterTypes()));
}
private void invokeinterface(String className, String methodName, String descriptor, String returnType,
String[] parameterTypes) {
// TODO: validate stack
int pop = 1 + parameterTypes.length;
for (String argument : parameterTypes) {
if (argument.equals("D") || argument.equals("J")) {
pop++;
}
}
int method = constPool.addInterfaceMethodEntry(className, methodName, descriptor);
writeByte(Opcode.INVOKEINTERFACE);
writeShort(method);
writeByte(pop);
writeByte(0);
currentOffset += 5;
if (returnType.equals("V")) {
advanceFrame(currentFrame.pop(pop));
} else {
advanceFrame(currentFrame.pop(pop).push(returnType));
}
}
public void ior() {
assertTypeOnStack(StackEntryType.INT, "ior requires int on stack");
assertTypeOnStack(1, StackEntryType.INT, "ior requires int on stack");
writeByte(Opcode.IOR);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void irem() {
assertTypeOnStack(StackEntryType.INT, "irem requires int on stack");
assertTypeOnStack(1, StackEntryType.INT, "irem requires int on stack");
writeByte(Opcode.IREM);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void ishl() {
assertTypeOnStack(StackEntryType.INT, "ishl requires int on stack");
assertTypeOnStack(1, StackEntryType.INT, "ishl requires int on stack");
writeByte(Opcode.ISHL);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void ishr() {
assertTypeOnStack(StackEntryType.INT, "ishr requires int on stack");
assertTypeOnStack(1, StackEntryType.INT, "ishr requires int on stack");
writeByte(Opcode.ISHR);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void istore(int no) {
assertTypeOnStack(StackEntryType.INT, "istore requires int on stack");
if (no > 0xFF) {
// wide version
writeByte(Opcode.WIDE);
writeByte(Opcode.ISTORE);
writeShort(no);
currentOffset += 4;
} else if (no >= 0 && no < 4) {
writeByte(Opcode.ISTORE_0 + no);
currentOffset++;
} else {
writeByte(Opcode.ISTORE);
writeByte(no);
currentOffset += 2;
}
advanceFrame(currentFrame.store(no));
}
public void isub() {
assertTypeOnStack(StackEntryType.INT, "isub requires int on stack");
assertTypeOnStack(1, StackEntryType.INT, "isub requires int on stack");
writeByte(Opcode.ISUB);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void iushr() {
assertTypeOnStack(StackEntryType.INT, "iushr requires int on stack");
assertTypeOnStack(1, StackEntryType.INT, "iushr requires int on stack");
writeByte(Opcode.IUSHR);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void ixor() {
assertTypeOnStack(StackEntryType.INT, "ixor requires int on stack");
assertTypeOnStack(1, StackEntryType.INT, "ixor requires int on stack");
writeByte(Opcode.IXOR);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void l2d() {
assertTypeOnStack(StackEntryType.LONG, "l2d requires long on stack");
writeByte(Opcode.L2D);
currentOffset++;
advanceFrame(currentFrame.pop2push1("D"));
}
public void l2f() {
assertTypeOnStack(StackEntryType.LONG, "l2f requires long on stack");
writeByte(Opcode.L2F);
currentOffset++;
advanceFrame(currentFrame.pop2push1("F"));
}
public void l2i() {
assertTypeOnStack(StackEntryType.LONG, "l2i requires long on stack");
writeByte(Opcode.L2I);
currentOffset++;
advanceFrame(currentFrame.pop2push1("I"));
}
public void ladd() {
assertTypeOnStack(StackEntryType.LONG, "ladd requires long on stack");
assertTypeOnStack(2, StackEntryType.LONG, "ladd requires long on stack");
writeByte(Opcode.LADD);
currentOffset++;
advanceFrame(currentFrame.pop2());
}
public void laload() {
assertTypeOnStack(StackEntryType.INT, "laload requires an int on top of the stack");
assertTypeOnStack(1, StackEntryType.OBJECT, "laload requires an array in position 2 on the stack");
writeByte(Opcode.LALOAD);
currentOffset++;
advanceFrame(currentFrame.pop2push1("J"));
}
public void land() {
assertTypeOnStack(StackEntryType.LONG, "land requires long on stack");
assertTypeOnStack(2, StackEntryType.LONG, "land requires long on stack");
writeByte(Opcode.LAND);
currentOffset++;
advanceFrame(currentFrame.pop2());
}
public void lastore() {
assertTypeOnStack(StackEntryType.LONG, "lastore requires an long on top of the stack");
assertTypeOnStack(2, StackEntryType.INT, "lastore requires an int in position 2 on the stack");
assertTypeOnStack(3, StackEntryType.OBJECT, "lastore requires an array reference in position 3 on the stack");
writeByte(Opcode.LASTORE);
currentOffset++;
advanceFrame(currentFrame.pop4());
}
public void lcmp() {
assertTypeOnStack(StackEntryType.LONG, "lcmp requires long on stack");
assertTypeOnStack(2, StackEntryType.LONG, "lcmp requires long on stack");
writeByte(Opcode.LCMP);
currentOffset++;
advanceFrame(currentFrame.pop4push1("I"));
}
/**
* Adds the appropriate lconst instruction.
*
* note, if the value is not 0 or 1 then ldc is used instead
*/
public void lconst(long value) {
if (value == 0) {
writeByte(Opcode.LCONST_0);
} else if (value == 1) {
writeByte(Opcode.LCONST_1);
} else {
ldc2(value);
return;
}
currentOffset++;
advanceFrame(currentFrame.push("J"));
}
/**
* Adds an ldc instruction for an int.
*
* @param value
*/
public void ldc(int value) {
if (value > -2 && value < 6) {
iconst(value);
return;
}
int index = constPool.addIntegerEntry(value);
ldcInternal(index);
advanceFrame(currentFrame.push("I"));
}
/**
* Adds an ldc instruction for float
*/
public void ldc(float value) {
int index = constPool.addFloatEntry(value);
ldcInternal(index);
advanceFrame(currentFrame.push("F"));
}
/**
* Adds an ldc instruction for a String
*
* To load a class literal using ldc use the @{link #loadType(String)} method.
*/
public void ldc(String value) {
int index = constPool.addStringEntry(value);
ldcInternal(index);
advanceFrame(currentFrame.push("Ljava/lang/String;"));
}
/**
* Adds an ldc instruction for an int.
*/
private void ldcInternal(int index) {
if (index > 0xFF) {
writeByte(Opcode.LDC_W);
writeShort(index);
currentOffset += 3;
} else {
writeByte(Opcode.LDC);
writeByte(index);
currentOffset += 2;
}
}
/**
* Adds an ldc2_w instruction for double
*/
public void ldc2(double value) {
int index = constPool.addDoubleEntry(value);
writeByte(Opcode.LDC2_W);
writeShort(index);
currentOffset += 3;
advanceFrame(currentFrame.push("D"));
}
/**
* Adds an ldc2_w instruction for long
*/
public void ldc2(long value) {
int index = constPool.addLongEntry(value);
writeByte(Opcode.LDC2_W);
writeShort(index);
currentOffset += 3;
advanceFrame(currentFrame.push("J"));
}
public void ldiv() {
assertTypeOnStack(StackEntryType.LONG, "ldiv requires long on stack");
assertTypeOnStack(2, StackEntryType.LONG, "ldiv requires long in position 3 on stack");
writeByte(Opcode.LDIV);
currentOffset++;
advanceFrame(currentFrame.pop2());
}
public void lload(int no) {
LocalVariableState locals = getLocalVars();
if (locals.size() <= no) {
throw new InvalidBytecodeException("Cannot load variable at " + no + ". Local Variables: " + locals.toString());
}
StackEntry entry = locals.get(no);
if (entry.getType() != StackEntryType.LONG) {
throw new InvalidBytecodeException("Invalid local variable at location " + no + " Local Variables "
+ locals.toString());
}
if (no > 0xFF) {
// wide version
writeByte(Opcode.WIDE);
writeByte(Opcode.LLOAD);
writeShort(no);
currentOffset += 4;
} else if (no >= 0 && no < 4) {
writeByte(Opcode.LLOAD_0 + no);
currentOffset++;
} else {
writeByte(Opcode.LLOAD);
writeByte(no);
currentOffset += 2;
}
advanceFrame(currentFrame.push(entry));
}
public void lmul() {
assertTypeOnStack(StackEntryType.LONG, "lmul requires long on stack");
assertTypeOnStack(2, StackEntryType.LONG, "lmul requires long in position 3 on stack");
writeByte(Opcode.LMUL);
currentOffset++;
advanceFrame(currentFrame.pop2());
}
public void lneg() {
assertTypeOnStack(StackEntryType.LONG, "lneg requires long on stack");
writeByte(Opcode.LNEG);
currentOffset++;
duplicateFrame();
}
/**
* Generates the apprpriate load instruction for the given type
*
* @param type The type of variable
* @param no local variable number
*/
public void load(Class type, int no) {
load(DescriptorUtils.makeDescriptor(type), no);
}
/**
* Generates the apprpriate load instruction for the given type
*
* @param descriptor The descriptor of the variable
* @param no local variable number
*/
public void load(String descriptor, int no) {
if (descriptor.length() != 1) {
aload(no);
} else {
char type = descriptor.charAt(0);
switch (type) {
case 'F':
fload(no);
break;
case 'J':
lload(no);
break;
case 'D':
dload(no);
break;
case 'I':
case 'S':
case 'B':
case 'C':
case 'Z':
iload(no);
break;
default:
throw new InvalidBytecodeException("Could not load primitive type: " + type);
}
}
}
public void loadClass(String className) {
int index = constPool.addClassEntry(className);
ldcInternal(index);
advanceFrame(currentFrame.push("Ljava/lang/Class;"));
}
/**
* Loads a java.lang.Class for the given descriptor into the stack.
*/
public void loadType(String descriptor) {
if (descriptor.length() != 1) {
if (descriptor.startsWith("L") && descriptor.endsWith(";")) {
descriptor = descriptor.substring(1, descriptor.length() - 1);
}
loadClass(descriptor);
} else {
char type = descriptor.charAt(0);
switch (type) {
case 'I':
getstatic(Integer.class.getName(), "TYPE", "Ljava/lang/Class;");
break;
case 'J':
getstatic(Long.class.getName(), "TYPE", "Ljava/lang/Class;");
break;
case 'S':
getstatic(Short.class.getName(), "TYPE", "Ljava/lang/Class;");
break;
case 'F':
getstatic(Float.class.getName(), "TYPE", "Ljava/lang/Class;");
break;
case 'D':
getstatic(Double.class.getName(), "TYPE", "Ljava/lang/Class;");
break;
case 'B':
getstatic(Byte.class.getName(), "TYPE", "Ljava/lang/Class;");
break;
case 'C':
getstatic(Character.class.getName(), "TYPE", "Ljava/lang/Class;");
break;
case 'Z':
getstatic(Boolean.class.getName(), "TYPE", "Ljava/lang/Class;");
break;
case 'V':
getstatic(Void.class.getName(), "TYPE", "Ljava/lang/Class;");
break;
default:
throw new InvalidBytecodeException("Unkown primitive type: " + type);
}
}
}
/**
* Adds a lookup switch statement
*
* @param lookupSwitchBuilder
* @return
*/
public void lookupswitch(final LookupSwitchBuilder lookupSwitchBuilder) {
assertTypeOnStack(StackEntryType.INT, "lookupswitch requires an int on the stack");
writeByte(Opcode.LOOKUPSWITCH);
final int startOffset = currentOffset;
currentOffset++;
while (currentOffset % 4 != 0) {
writeByte(0);
currentOffset++;
}
StackFrame frame = currentFrame.pop();
final List values = new ArrayList(lookupSwitchBuilder.getValues());
if (lookupSwitchBuilder.getDefaultLocation() != null) {
writeInt(lookupSwitchBuilder.getDefaultLocation().getLocation() - currentOffset);
} else {
writeInt(0);
final BranchEnd ret = new BranchEnd(currentOffset, frame, true, startOffset);
lookupSwitchBuilder.getDefaultBranchEnd().set(ret);
}
writeInt(values.size());
currentOffset += 8;
Collections.sort(values);
for (final LookupSwitchBuilder.ValuePair value : values) {
writeInt(value.getValue());
currentOffset += 4;
if (value.getLocation() != null) {
writeInt(value.getLocation().getLocation());
currentOffset += 4;
} else {
writeInt(0);
final BranchEnd ret = new BranchEnd(currentOffset, frame, true, startOffset);
value.getBranchEnd().set(ret);
currentOffset += 4;
}
}
currentFrame = null;
}
public void lor() {
assertTypeOnStack(StackEntryType.LONG, "lor requires long on stack");
assertTypeOnStack(2, StackEntryType.LONG, "lor requires long in position 3 on stack");
writeByte(Opcode.LOR);
currentOffset++;
advanceFrame(currentFrame.pop2());
}
public void lrem() {
assertTypeOnStack(StackEntryType.LONG, "lrem requires long on stack");
assertTypeOnStack(2, StackEntryType.LONG, "lrem requires long in position 3 on stack");
writeByte(Opcode.LREM);
currentOffset++;
advanceFrame(currentFrame.pop2());
}
public void lshl() {
assertTypeOnStack(StackEntryType.INT, "lshl requires int on stack");
assertTypeOnStack(1, StackEntryType.LONG, "lshl requires long in position 2 on stack");
writeByte(Opcode.LSHL);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void lshr() {
assertTypeOnStack(StackEntryType.INT, "lshr requires int on stack");
assertTypeOnStack(1, StackEntryType.LONG, "lshr requires long in position 2 on stack");
writeByte(Opcode.LSHR);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void lstore(int no) {
assertTypeOnStack(StackEntryType.LONG, "lstore requires long on stack");
if (no > 0xFF) {
// wide version
writeByte(Opcode.WIDE);
writeByte(Opcode.LSTORE);
writeShort(no);
currentOffset += 4;
} else if (no >= 0 && no < 4) {
writeByte(Opcode.LSTORE_0 + no);
currentOffset++;
} else {
writeByte(Opcode.LSTORE);
writeByte(no);
currentOffset += 2;
}
advanceFrame(currentFrame.store(no));
}
public void lsub() {
assertTypeOnStack(StackEntryType.LONG, "lsub requires long on stack");
assertTypeOnStack(2, StackEntryType.LONG, "lsub requires long in position 3 on stack");
writeByte(Opcode.LSUB);
currentOffset++;
advanceFrame(currentFrame.pop2());
}
public void lushr() {
assertTypeOnStack(StackEntryType.INT, "lushr requires int on stack");
assertTypeOnStack(1, StackEntryType.LONG, "lushr requires long in position 2 on stack");
writeByte(Opcode.LUSHR);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void lxor() {
assertTypeOnStack(StackEntryType.LONG, "lxor requires long on stack");
assertTypeOnStack(2, StackEntryType.LONG, "lxor requires long in position 3 on stack");
writeByte(Opcode.LXOR);
currentOffset++;
advanceFrame(currentFrame.pop2());
}
/**
* Gets the location object for the current location in the bytecode. Jumps to this location will begin executing the next
* instruction that is written to the bytecode stream
*/
public CodeLocation mark() {
return new CodeLocation(currentOffset, currentFrame);
}
public void monitorenter() {
assertTypeOnStack(StackEntryType.OBJECT, "monitorenter requires object reference on stack");
writeByte(Opcode.MONITORENTER);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void monitorexit() {
assertTypeOnStack(StackEntryType.OBJECT, "monitorexit requires object reference on stack");
writeByte(Opcode.MONITOREXIT);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void multianewarray(String arrayType, int dimensions) {
StringBuilder newType = new StringBuilder();
for (int i = 0; i < dimensions; ++i) {
assertTypeOnStack(i, StackEntryType.INT, "multianewarray requires int on stack in position " + i);
newType.append('[');
}
if (!arrayType.startsWith("[")) {
newType.append('L');
newType.append(arrayType);
newType.append(";");
} else {
newType.append(arrayType);
}
int classIndex = constPool.addClassEntry(newType.toString());
writeByte(Opcode.MULTIANEWARRAY);
writeShort(classIndex);
writeByte(dimensions);
currentOffset += 4;
advanceFrame(currentFrame.pop(dimensions).push(newType.toString()));
}
public void newInstruction(String classname) {
int classIndex = constPool.addClassEntry(classname);
writeByte(Opcode.NEW);
writeShort(classIndex);
StackEntry entry = new StackEntry(StackEntryType.UNITITIALIZED_OBJECT, classname, currentOffset);
currentOffset += 3;
advanceFrame(currentFrame.push(entry));
}
public void newInstruction(Class clazz) {
newInstruction(clazz.getName());
}
/**
* arrayType must be a {@link Class} object that represents a primitive type
*/
public void newarray(Class arrayType) {
assertTypeOnStack(StackEntryType.INT, "newarray requires int on stack");
int type = 0;
String desc;
if (arrayType == boolean.class) {
type = Opcode.T_BOOLEAN;
desc = "[Z";
} else if (arrayType == char.class) {
type = Opcode.T_CHAR;
desc = "[C";
} else if (arrayType == float.class) {
type = Opcode.T_FLOAT;
desc = "[F";
} else if (arrayType == double.class) {
type = Opcode.T_DOUBLE;
desc = "[D";
} else if (arrayType == byte.class) {
type = Opcode.T_BYTE;
desc = "[B";
} else if (arrayType == short.class) {
type = Opcode.T_SHORT;
desc = "[S";
} else if (arrayType == int.class) {
type = Opcode.T_INT;
desc = "[I";
} else if (arrayType == long.class) {
type = Opcode.T_LONG;
desc = "[J";
} else {
throw new InvalidBytecodeException("Class " + arrayType + " is not a primitive type");
}
writeByte(Opcode.NEWARRAY);
writeByte(type);
currentOffset += 2;
advanceFrame(currentFrame.replace(desc));
}
public void nop() {
writeByte(Opcode.NOP);
currentOffset++;
duplicateFrame();
}
public void pop() {
writeByte(Opcode.POP);
currentOffset++;
advanceFrame(currentFrame.pop());
}
public void pop2() {
writeByte(Opcode.POP2);
currentOffset++;
advanceFrame(currentFrame.pop2());
}
public void putfield(String className, String field, Class fieldType) {
putfield(className, field, DescriptorUtils.makeDescriptor(fieldType));
}
public void putfield(String className, String field, String descriptor) {
if (!getStack().isOnTop(descriptor)) {
throw new InvalidBytecodeException("Attempting to put wrong type into field. Field:" + className + "."
+ field + " (" + descriptor + "). Stack State: " + getStack().toString());
}
if (getStack().top_1().getType() != StackEntryType.UNINITIALIZED_THIS) {
assertTypeOnStack(1, StackEntryType.OBJECT, "expected object in position 2 on stack");
}
int index = constPool.addFieldEntry(className, field, descriptor);
writeByte(Opcode.PUTFIELD);
writeShort(index);
currentOffset += 3;
advanceFrame(currentFrame.pop2());
}
public void putstatic(String className, String field, Class fieldType) {
putstatic(className, field, DescriptorUtils.makeDescriptor(fieldType));
}
public void putstatic(String className, String field, String descriptor) {
if (!getStack().isOnTop(descriptor)) {
throw new InvalidBytecodeException("Attempting to put wrong type into static field. Field:" + className + "."
+ field + " (" + descriptor + "). Stack State: " + getStack().toString());
}
int index = constPool.addFieldEntry(className, field, descriptor);
writeByte(Opcode.PUTSTATIC);
writeShort(index);
currentOffset += 3;
advanceFrame(currentFrame.pop());
}
/**
* Adds the appropriate return instruction for the methods return type.
*/
public void returnInstruction() {
String returnType = method.getReturnType();
if (!returnType.equals("V")) {
if (!getStack().isOnTop(returnType)) {
throw new InvalidBytecodeException(returnType + " is not on top of stack. " + getStack().toString());
}
}
// all these instructions are one byte
currentOffset++;
// return instructions do not create stack map entries
if (returnType.length() > 1) {
writeByte(Opcode.ARETURN);
} else {
char ret = method.getReturnType().charAt(0);
switch (ret) {
case 'V':
writeByte(Opcode.RETURN);
break;
case 'I':
case 'Z':
case 'S':
case 'B':
case 'C':
writeByte(Opcode.IRETURN);
break;
case 'F':
writeByte(Opcode.FRETURN);
break;
case 'D':
writeByte(Opcode.DRETURN);
break;
case 'J':
writeByte(Opcode.LRETURN);
}
}
currentFrame = null;
}
public void saload() {
assertTypeOnStack(StackEntryType.INT, "saload requires an int on top of the stack");
assertTypeOnStack(1, StackEntryType.OBJECT, "saload requires an array in position 2 on the stack");
writeByte(Opcode.SALOAD);
currentOffset++;
advanceFrame(currentFrame.pop2push1("I"));
}
public void sastore() {
assertTypeOnStack(StackEntryType.INT, "sastore requires an int on top of the stack");
assertTypeOnStack(1, StackEntryType.INT, "sastore requires an int in position 2 on the stack");
assertTypeOnStack(2, StackEntryType.OBJECT, "sastore requires an array reference in position 3 on the stack");
writeByte(Opcode.SASTORE);
currentOffset++;
advanceFrame(currentFrame.pop3());
}
public void sipush(short value) {
writeByte(Opcode.SIPUSH);
writeShort(value);
currentOffset += 3;
advanceFrame(currentFrame.push("S"));
}
public void swap() {
assertNotWideOnStack("swap cannot be used when wide type is on top of stack");
assertNotWideOnStack(1, "swap cannot be used when wide type is on position 1 of the stack");
writeByte(Opcode.SWAP);
currentOffset++;
advanceFrame(currentFrame.swap());
}
public void tableswitch(final TableSwitchBuilder builder) {
assertTypeOnStack(StackEntryType.INT, "lookupswitch requires an int on the stack");
writeByte(Opcode.TABLESWITCH);
final int startOffset = currentOffset;
currentOffset++;
while (currentOffset % 4 != 0) {
writeByte(0);
currentOffset++;
}
if(builder.getHigh() - builder.getLow() + 1 != builder.getValues().size()) {
throw new RuntimeException("high - low + 1 != the number of values in the table");
}
StackFrame frame = currentFrame.pop();
if (builder.getDefaultLocation() != null) {
writeInt(builder.getDefaultLocation().getLocation() - currentOffset);
} else {
writeInt(0);
final BranchEnd ret = new BranchEnd(currentOffset, frame, true, startOffset);
builder.getDefaultBranchEnd().set(ret);
}
writeInt(builder.getLow());
writeInt(builder.getHigh());
currentOffset += 12;
for (final TableSwitchBuilder.ValuePair value : builder.getValues()) {
if (value.getLocation() != null) {
writeInt(value.getLocation().getLocation());
currentOffset += 4;
} else {
writeInt(0);
final BranchEnd ret = new BranchEnd(currentOffset, frame, true, startOffset);
value.getBranchEnd().set(ret);
currentOffset += 4;
}
}
currentFrame = null;
}
/**
* loads all parameters onto the stack.
*
* If this method is non-static then the parameter at location 0 (i.e. this object) is not pushed.
*/
public void loadMethodParameters() {
int index = method.isStatic() ? 0 : 1;
for (String type : method.getParameters()) {
if (type.length() > 1) {
// object or array
aload(index);
} else if (type.equals("D")) {
dload(index);
index++;
} else if (type.equals("J")) {
lload(index);
index++;
} else if (type.equals("F")) {
fload(index);
} else {
iload(index);
}
index++;
}
}
private void writeByte(int n) {
try {
data.writeByte(n);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
private void writeShort(int n) {
try {
if(n > Short.MAX_VALUE) {
throw new RuntimeException(n + " is to big to be written as a 16 bit value");
}
data.writeShort(n);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
private void writeInt(int n) {
try {
data.writeInt(n);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
/**
* overwrites a 16 bit value in the already written bytecode data
*/
private void overwriteShort(byte[] bytecode, int offset, int value) {
bytecode[offset] = (byte) (value >> 8);
bytecode[offset + 1] = (byte) (value);
}
/**
* overwrites a 32 bit value in the already written bytecode data
*/
private void overwriteInt(byte[] bytecode, int offset, int value) {
bytecode[offset] = (byte) (value >> 24);
bytecode[offset + 1] = (byte) (value >> 16);
bytecode[offset + 2] = (byte) (value >> 8);
bytecode[offset + 3] = (byte) (value);
}
public LinkedHashMap getStackFrames() {
return new LinkedHashMap(stackFrames);
}
public void setupFrame(String ... types) {
final LocalVariableState localVariableState = new LocalVariableState(constPool, types);
final StackFrame f = new StackFrame(new StackState(constPool), localVariableState, StackFrameType.FULL_FRAME);
mergeStackFrames(f);
}
public ConstPool getConstPool() {
return constPool;
}
/**
* Adds a duplicate of the current frame to the current position.
*
* currently this just puts the same frame into a different position
*/
private void duplicateFrame() {
stackFrames.put(currentOffset, currentFrame);
updateMaxValues();
}
private void advanceFrame(StackFrame frame) {
stackFrames.put(currentOffset, frame);
currentFrame = frame;
updateMaxValues();
}
private void updateMaxValues() {
if (getStack().getContents().size() > maxStackDepth) {
maxStackDepth = getStack().getContents().size();
}
if (getLocalVars().getContents().size() > maxLocals) {
maxLocals = getLocalVars().getContents().size();
}
}
private LocalVariableState getLocalVars() {
if(currentFrame == null) {
throw new RuntimeException("No local variable information available, call setupFrame first");
}
return currentFrame.getLocalVariableState();
}
private StackState getStack() {
return currentFrame.getStackState();
}
public void assertTypeOnStack(int position, StackEntryType type, String message) {
if (getStack().size() <= position) {
throw new InvalidBytecodeException(message + " Stack State: " + getStack().toString());
}
int index = getStack().getContents().size() - 1 - position;
if (type == StackEntryType.DOUBLE || type == StackEntryType.LONG) {
index -= 1;
}
StackEntryType stype = getStack().getContents().get(index).getType();
if (stype != type) {
if (!(type == StackEntryType.OBJECT && stype == StackEntryType.NULL)) {
throw new InvalidBytecodeException(message + " Stack State: " + getStack().toString());
}
}
}
public void assertTypeOnStack(StackEntryType type, String message) {
assertTypeOnStack(0, type, message);
}
public void assertNotWideOnStack(int position, String message) {
if (getStack().size() <= position) {
throw new InvalidBytecodeException(message + " Stack State: " + getStack().toString());
}
int index = getStack().getContents().size() - 1 - position;
StackEntryType stype = getStack().getContents().get(index).getType();
if (stype == StackEntryType.TOP) {
throw new InvalidBytecodeException(message + " Stack State: " + getStack().toString());
}
}
public void assertNotWideOnStack(String message) {
assertNotWideOnStack(0, message);
}
/**
* Merge the stack frames.
*
* If the frames are incompatible then an {@link InvalidBytecodeException} is thrown. If the frames cannot be properly
* merged then the stack map is marked as invalid
*/
private void mergeStackFrames(StackFrame stackFrame) {
if (currentFrame == null) {
currentFrame = stackFrame;
stackFrames.put(currentOffset, currentFrame);
return;
}
StackState currentStackState = getStack();
StackState mergeStackState = stackFrame.getStackState();
if (currentStackState.size() != mergeStackState.size()) {
throw new InvalidBytecodeException("Cannot merge stack frames, different stack sizes");
}
for (int i = 0; i < mergeStackState.size(); ++i) {
StackEntry currentEntry = currentStackState.getContents().get(i);
StackEntry mergeEntry = mergeStackState.getContents().get(i);
if (mergeEntry.getType() == currentEntry.getType()) {
if (mergeEntry.getType() == StackEntryType.OBJECT) {
if (!mergeEntry.getDescriptor().equals(currentEntry.getDescriptor())) {
if (!mergeEntry.equals("Ljava/lang/Object;")) {
// we cannot reliably determine if closes common superclass at this point
// so we will just mark the stack map attribute as invalid
stackMapAttributeValid = false;
}
}
}
} else if (!((mergeEntry.getType() == StackEntryType.NULL && currentEntry.getType() == StackEntryType.OBJECT) || (mergeEntry
.getType() == StackEntryType.OBJECT && currentEntry.getType() == StackEntryType.NULL))) {
throw new InvalidBytecodeException("Cannot merge stack frame " + currentStackState + " with frame "
+ mergeStackState + " stack entry " + i + " is invalid");
}
}
LocalVariableState currentLocalVariableState = getLocalVars();
LocalVariableState mergeLocalVariableState = getLocalVars();
if (currentLocalVariableState.size() < mergeLocalVariableState.size()) {
throw new InvalidBytecodeException(
"Cannot merge stack frames, merge location has less locals than current location");
}
for (int i = 0; i < mergeLocalVariableState.size(); ++i) {
StackEntry currentEntry = currentLocalVariableState.getContents().get(i);
StackEntry mergeEntry = mergeLocalVariableState.getContents().get(i);
if (mergeEntry.getType() == currentEntry.getType()) {
if (mergeEntry.getType() == StackEntryType.OBJECT) {
if (!mergeEntry.getDescriptor().equals(currentEntry.getDescriptor())) {
if (!mergeEntry.equals("Ljava/lang/Object;")) {
// we cannot reliably determine if closes common superclass at this point
// so we will just mark the stack map attribute as invalid
stackMapAttributeValid = false;
}
}
}
} else if (!((mergeEntry.getType() == StackEntryType.NULL && currentEntry.getType() == StackEntryType.OBJECT) || (mergeEntry
.getType() == StackEntryType.OBJECT && currentEntry.getType() == StackEntryType.NULL))) {
throw new InvalidBytecodeException("Cannot merge stack frame " + currentLocalVariableState + " with frame "
+ currentLocalVariableState + " local variable entry " + i + " is invalid");
}
}
}
private void addIfIcmp(CodeLocation location, int opcode, String name) {
assertTypeOnStack(StackEntryType.INT, name + " requires int on stack");
assertTypeOnStack(1, StackEntryType.INT, name + " requires int in position 2 on stack");
writeByte(opcode);
writeShort(location.getLocation() - currentOffset);
currentOffset += 3;
advanceFrame(currentFrame.pop2());
mergeStackFrames(location.getStackFrame());
}
private BranchEnd addIfIcmp(int opcode, String name) {
assertTypeOnStack(StackEntryType.INT, name + " requires int on stack");
assertTypeOnStack(1, StackEntryType.INT, name + " requires int int position 2 on stack");
writeByte(opcode);
writeShort(0);
currentOffset += 3;
advanceFrame(currentFrame.pop2());
BranchEnd ret = new BranchEnd(currentOffset - 2, currentFrame, currentOffset - 3);
return ret;
}
private void addIf(CodeLocation location, int opcode, String name) {
assertTypeOnStack(StackEntryType.INT, name + " requires int on stack");
writeByte(opcode);
writeShort(location.getLocation() - currentOffset);
currentOffset += 3;
advanceFrame(currentFrame.pop());
mergeStackFrames(location.getStackFrame());
}
private BranchEnd addIf(int opcode, String name) {
assertTypeOnStack(StackEntryType.INT, name + " requires int on stack");
writeByte(opcode);
writeShort(0);
currentOffset += 3;
advanceFrame(currentFrame.pop());
BranchEnd ret = new BranchEnd(currentOffset - 2, currentFrame, currentOffset - 3);
return ret;
}
private void addNullComparison(CodeLocation location, int opcode, String name) {
assertTypeOnStack(StackEntryType.OBJECT, name + " requires reference type on stack");
writeByte(opcode);
writeShort(location.getLocation() - currentOffset);
currentOffset += 3;
advanceFrame(currentFrame.pop());
mergeStackFrames(location.getStackFrame());
}
private BranchEnd addNullComparison(int opcode, String name) {
assertTypeOnStack(StackEntryType.OBJECT, name + " requires reference type on stack");
writeByte(opcode);
writeShort(0);
currentOffset += 3;
advanceFrame(currentFrame.pop());
BranchEnd ret = new BranchEnd(currentOffset - 2, currentFrame, currentOffset - 3);
return ret;
}
}
