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org.hibernate.bytecode.internal.javassist.FieldTransformer Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008-2013, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.bytecode.internal.javassist;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.List;
import javassist.CannotCompileException;
import javassist.ClassPool;
import javassist.bytecode.AccessFlag;
import javassist.bytecode.BadBytecode;
import javassist.bytecode.Bytecode;
import javassist.bytecode.ClassFile;
import javassist.bytecode.CodeAttribute;
import javassist.bytecode.CodeIterator;
import javassist.bytecode.ConstPool;
import javassist.bytecode.Descriptor;
import javassist.bytecode.FieldInfo;
import javassist.bytecode.MethodInfo;
import javassist.bytecode.Opcode;
import javassist.bytecode.StackMapTable;
import javassist.bytecode.stackmap.MapMaker;
/**
* The thing that handles actual class enhancement in regards to
* intercepting field accesses.
*
* @author Muga Nishizawa
* @author Steve Ebersole
* @author Dustin Schultz
*/
public class FieldTransformer {
private static final String EACH_READ_METHOD_PREFIX = "$javassist_read_";
private static final String EACH_WRITE_METHOD_PREFIX = "$javassist_write_";
private static final String FIELD_HANDLED_TYPE_NAME = FieldHandled.class.getName();
private static final String HANDLER_FIELD_NAME = "$JAVASSIST_READ_WRITE_HANDLER";
private static final String FIELD_HANDLER_TYPE_NAME = FieldHandler.class.getName();
private static final String HANDLER_FIELD_DESCRIPTOR = 'L' + FIELD_HANDLER_TYPE_NAME.replace( '.', '/' ) + ';';
private static final String GETFIELDHANDLER_METHOD_NAME = "getFieldHandler";
private static final String SETFIELDHANDLER_METHOD_NAME = "setFieldHandler";
private static final String GETFIELDHANDLER_METHOD_DESCRIPTOR = "()" + HANDLER_FIELD_DESCRIPTOR;
private static final String SETFIELDHANDLER_METHOD_DESCRIPTOR = "(" + HANDLER_FIELD_DESCRIPTOR + ")V";
private final FieldFilter filter;
private final ClassPool classPool;
FieldTransformer(FieldFilter f, ClassPool c) {
filter = f;
classPool = c;
}
/**
* Transform the class contained in the given file, writing the result back to the same file.
*
* @param file The file containing the class to be transformed
*
* @throws Exception Indicates a problem performing the transformation
*/
public void transform(File file) throws Exception {
final DataInputStream in = new DataInputStream( new FileInputStream( file ) );
final ClassFile classfile = new ClassFile( in );
transform( classfile );
final DataOutputStream out = new DataOutputStream( new FileOutputStream( file ) );
try {
classfile.write( out );
}
finally {
out.close();
}
}
/**
* Transform the class defined by the given ClassFile descriptor. The ClassFile descriptor itself is mutated
*
* @param classFile The class file descriptor
*
* @throws Exception Indicates a problem performing the transformation
*/
public void transform(ClassFile classFile) throws Exception {
if ( classFile.isInterface() ) {
return;
}
try {
addFieldHandlerField( classFile );
addGetFieldHandlerMethod( classFile );
addSetFieldHandlerMethod( classFile );
addFieldHandledInterface( classFile );
addReadWriteMethods( classFile );
transformInvokevirtualsIntoPutAndGetfields( classFile );
}
catch (CannotCompileException e) {
throw new RuntimeException( e.getMessage(), e );
}
}
private void addFieldHandlerField(ClassFile classfile) throws CannotCompileException {
final ConstPool constPool = classfile.getConstPool();
final FieldInfo fieldInfo = new FieldInfo( constPool, HANDLER_FIELD_NAME, HANDLER_FIELD_DESCRIPTOR );
fieldInfo.setAccessFlags( AccessFlag.PRIVATE | AccessFlag.TRANSIENT );
classfile.addField( fieldInfo );
}
private void addGetFieldHandlerMethod(ClassFile classfile) throws CannotCompileException, BadBytecode {
final ConstPool constPool = classfile.getConstPool();
final int thisClassInfo = constPool.getThisClassInfo();
final MethodInfo getterMethodInfo = new MethodInfo(
constPool,
GETFIELDHANDLER_METHOD_NAME,
GETFIELDHANDLER_METHOD_DESCRIPTOR
);
/* local variable | this | */
final Bytecode code = new Bytecode( constPool, 2, 1 );
// aload_0 // load this
code.addAload( 0 );
// getfield // get field "$JAVASSIST_CALLBACK" defined already
code.addOpcode( Opcode.GETFIELD );
final int fieldIndex = constPool.addFieldrefInfo( thisClassInfo, HANDLER_FIELD_NAME, HANDLER_FIELD_DESCRIPTOR );
code.addIndex( fieldIndex );
// areturn // return the value of the field
code.addOpcode( Opcode.ARETURN );
getterMethodInfo.setCodeAttribute( code.toCodeAttribute() );
getterMethodInfo.setAccessFlags( AccessFlag.PUBLIC );
final CodeAttribute codeAttribute = getterMethodInfo.getCodeAttribute();
if ( codeAttribute != null ) {
final StackMapTable smt = MapMaker.make( classPool, getterMethodInfo );
codeAttribute.setAttribute( smt );
}
classfile.addMethod( getterMethodInfo );
}
private void addSetFieldHandlerMethod(ClassFile classfile) throws CannotCompileException, BadBytecode {
final ConstPool constPool = classfile.getConstPool();
final int thisClassInfo = constPool.getThisClassInfo();
final MethodInfo methodInfo = new MethodInfo(
constPool,
SETFIELDHANDLER_METHOD_NAME,
SETFIELDHANDLER_METHOD_DESCRIPTOR
);
/* local variables | this | callback | */
final Bytecode code = new Bytecode(constPool, 3, 3);
// aload_0 : load this
code.addAload( 0 );
// aload_1 : load callback
code.addAload( 1 );
// putfield // put field "$JAVASSIST_CALLBACK" defined already
code.addOpcode( Opcode.PUTFIELD );
final int fieldIndex = constPool.addFieldrefInfo( thisClassInfo, HANDLER_FIELD_NAME, HANDLER_FIELD_DESCRIPTOR );
code.addIndex( fieldIndex );
// return
code.addOpcode( Opcode.RETURN );
methodInfo.setCodeAttribute( code.toCodeAttribute() );
methodInfo.setAccessFlags( AccessFlag.PUBLIC );
final CodeAttribute codeAttribute = methodInfo.getCodeAttribute();
if ( codeAttribute != null ) {
final StackMapTable smt = MapMaker.make( classPool, methodInfo );
codeAttribute.setAttribute( smt );
}
classfile.addMethod( methodInfo );
}
private void addFieldHandledInterface(ClassFile classfile) {
final String[] interfaceNames = classfile.getInterfaces();
final String[] newInterfaceNames = new String[interfaceNames.length + 1];
System.arraycopy( interfaceNames, 0, newInterfaceNames, 0, interfaceNames.length );
newInterfaceNames[newInterfaceNames.length - 1] = FIELD_HANDLED_TYPE_NAME;
classfile.setInterfaces( newInterfaceNames );
}
private void addReadWriteMethods(ClassFile classfile) throws CannotCompileException, BadBytecode {
final List fields = classfile.getFields();
for ( Object field : fields ) {
final FieldInfo finfo = (FieldInfo) field;
if ( (finfo.getAccessFlags() & AccessFlag.STATIC) == 0 && (!finfo.getName().equals( HANDLER_FIELD_NAME )) ) {
// case of non-static field
if ( filter.handleRead( finfo.getDescriptor(), finfo.getName() ) ) {
addReadMethod( classfile, finfo );
}
if ( filter.handleWrite( finfo.getDescriptor(), finfo.getName() ) ) {
addWriteMethod( classfile, finfo );
}
}
}
}
private void addReadMethod(ClassFile classfile, FieldInfo finfo) throws CannotCompileException, BadBytecode {
final ConstPool constPool = classfile.getConstPool();
final int thisClassInfo = constPool.getThisClassInfo();
final String readMethodDescriptor = "()" + finfo.getDescriptor();
final MethodInfo readMethodInfo = new MethodInfo(
constPool,
EACH_READ_METHOD_PREFIX + finfo.getName(),
readMethodDescriptor
);
/* local variables | target obj | each oldvalue | */
final Bytecode code = new Bytecode(constPool, 5, 3);
// aload_0
code.addAload( 0 );
// getfield // get each field
code.addOpcode( Opcode.GETFIELD );
final int baseFieldIndex = constPool.addFieldrefInfo( thisClassInfo, finfo.getName(), finfo.getDescriptor() );
code.addIndex( baseFieldIndex );
// aload_0
code.addAload( 0 );
// invokeinterface : invoke Enabled.getInterceptFieldCallback()
final int enabledClassIndex = constPool.addClassInfo( FIELD_HANDLED_TYPE_NAME );
code.addInvokeinterface(
enabledClassIndex,
GETFIELDHANDLER_METHOD_NAME,
GETFIELDHANDLER_METHOD_DESCRIPTOR,
1
);
// ifnonnull
code.addOpcode( Opcode.IFNONNULL );
code.addIndex( 4 );
// *return // each type
addTypeDependDataReturn( code, finfo.getDescriptor() );
// *store_1 // each type
addTypeDependDataStore( code, finfo.getDescriptor(), 1 );
// aload_0
code.addAload( 0 );
// invokeinterface // invoke Enabled.getInterceptFieldCallback()
code.addInvokeinterface(
enabledClassIndex,
GETFIELDHANDLER_METHOD_NAME, GETFIELDHANDLER_METHOD_DESCRIPTOR,
1
);
// aload_0
code.addAload( 0 );
// ldc // name of the field
code.addLdc( finfo.getName() );
// *load_1 // each type
addTypeDependDataLoad( code, finfo.getDescriptor(), 1 );
// invokeinterface // invoke Callback.read*() // each type
addInvokeFieldHandlerMethod(
classfile, code, finfo.getDescriptor(),
true
);
// *return // each type
addTypeDependDataReturn( code, finfo.getDescriptor() );
readMethodInfo.setCodeAttribute( code.toCodeAttribute() );
readMethodInfo.setAccessFlags( AccessFlag.PUBLIC );
final CodeAttribute codeAttribute = readMethodInfo.getCodeAttribute();
if ( codeAttribute != null ) {
final StackMapTable smt = MapMaker.make( classPool, readMethodInfo );
codeAttribute.setAttribute( smt );
}
classfile.addMethod( readMethodInfo );
}
private void addWriteMethod(ClassFile classfile, FieldInfo finfo) throws CannotCompileException, BadBytecode {
final ConstPool constPool = classfile.getConstPool();
final int thisClassInfo = constPool.getThisClassInfo();
final String writeMethodDescriptor = "(" + finfo.getDescriptor() + ")V";
final MethodInfo writeMethodInfo = new MethodInfo(
constPool,
EACH_WRITE_METHOD_PREFIX+ finfo.getName(),
writeMethodDescriptor
);
/* local variables | target obj | each oldvalue | */
final Bytecode code = new Bytecode(constPool, 6, 3);
// aload_0
code.addAload( 0 );
// invokeinterface : enabled.getInterceptFieldCallback()
final int enabledClassIndex = constPool.addClassInfo( FIELD_HANDLED_TYPE_NAME );
code.addInvokeinterface(
enabledClassIndex,
GETFIELDHANDLER_METHOD_NAME, GETFIELDHANDLER_METHOD_DESCRIPTOR,
1
);
// ifnonnull (label1)
code.addOpcode( Opcode.IFNONNULL );
code.addIndex( 9 );
// aload_0
code.addAload( 0 );
// *load_1
addTypeDependDataLoad( code, finfo.getDescriptor(), 1 );
// putfield
code.addOpcode( Opcode.PUTFIELD );
final int baseFieldIndex = constPool.addFieldrefInfo( thisClassInfo, finfo.getName(), finfo.getDescriptor() );
code.addIndex( baseFieldIndex );
code.growStack( -Descriptor.dataSize( finfo.getDescriptor() ) );
// return ;
code.addOpcode( Opcode.RETURN );
// aload_0
code.addAload( 0 );
// dup
code.addOpcode( Opcode.DUP );
// invokeinterface // enabled.getInterceptFieldCallback()
code.addInvokeinterface(
enabledClassIndex,
GETFIELDHANDLER_METHOD_NAME,
GETFIELDHANDLER_METHOD_DESCRIPTOR,
1
);
// aload_0
code.addAload( 0 );
// ldc // field name
code.addLdc( finfo.getName() );
// aload_0
code.addAload( 0 );
// getfield // old value of the field
code.addOpcode( Opcode.GETFIELD );
code.addIndex( baseFieldIndex );
code.growStack( Descriptor.dataSize( finfo.getDescriptor() ) - 1 );
// *load_1
addTypeDependDataLoad( code, finfo.getDescriptor(), 1 );
// invokeinterface // callback.write*(..)
addInvokeFieldHandlerMethod( classfile, code, finfo.getDescriptor(), false );
// putfield // new value of the field
code.addOpcode( Opcode.PUTFIELD );
code.addIndex( baseFieldIndex );
code.growStack( -Descriptor.dataSize( finfo.getDescriptor() ) );
// return
code.addOpcode( Opcode.RETURN );
writeMethodInfo.setCodeAttribute( code.toCodeAttribute() );
writeMethodInfo.setAccessFlags( AccessFlag.PUBLIC );
final CodeAttribute codeAttribute = writeMethodInfo.getCodeAttribute();
if ( codeAttribute != null ) {
final StackMapTable smt = MapMaker.make( classPool, writeMethodInfo );
codeAttribute.setAttribute( smt );
}
classfile.addMethod( writeMethodInfo );
}
private void transformInvokevirtualsIntoPutAndGetfields(ClassFile classfile) throws CannotCompileException, BadBytecode {
for ( Object o : classfile.getMethods() ) {
final MethodInfo methodInfo = (MethodInfo) o;
final String methodName = methodInfo.getName();
if ( methodName.startsWith( EACH_READ_METHOD_PREFIX )
|| methodName.startsWith( EACH_WRITE_METHOD_PREFIX )
|| methodName.equals( GETFIELDHANDLER_METHOD_NAME )
|| methodName.equals( SETFIELDHANDLER_METHOD_NAME ) ) {
continue;
}
final CodeAttribute codeAttr = methodInfo.getCodeAttribute();
if ( codeAttr == null ) {
continue;
}
final CodeIterator iter = codeAttr.iterator();
while ( iter.hasNext() ) {
int pos = iter.next();
pos = transformInvokevirtualsIntoGetfields( classfile, iter, pos );
transformInvokevirtualsIntoPutfields( classfile, iter, pos );
}
final StackMapTable smt = MapMaker.make( classPool, methodInfo );
codeAttr.setAttribute( smt );
}
}
private int transformInvokevirtualsIntoGetfields(ClassFile classfile, CodeIterator iter, int pos) {
final ConstPool constPool = classfile.getConstPool();
final int c = iter.byteAt( pos );
if ( c != Opcode.GETFIELD ) {
return pos;
}
final int index = iter.u16bitAt( pos + 1 );
final String fieldName = constPool.getFieldrefName( index );
final String className = constPool.getFieldrefClassName( index );
if ( !filter.handleReadAccess( className, fieldName ) ) {
return pos;
}
final String fieldReaderMethodDescriptor = "()" + constPool.getFieldrefType( index );
final int fieldReaderMethodIndex = constPool.addMethodrefInfo(
constPool.getThisClassInfo(),
EACH_READ_METHOD_PREFIX + fieldName,
fieldReaderMethodDescriptor
);
iter.writeByte( Opcode.INVOKEVIRTUAL, pos );
iter.write16bit( fieldReaderMethodIndex, pos + 1 );
return pos;
}
private int transformInvokevirtualsIntoPutfields(ClassFile classfile, CodeIterator iter, int pos) {
final ConstPool constPool = classfile.getConstPool();
final int c = iter.byteAt( pos );
if ( c != Opcode.PUTFIELD ) {
return pos;
}
final int index = iter.u16bitAt( pos + 1 );
final String fieldName = constPool.getFieldrefName( index );
final String className = constPool.getFieldrefClassName( index );
if ( !filter.handleWriteAccess( className, fieldName ) ) {
return pos;
}
final String fieldWriterMethodDescriptor = "(" + constPool.getFieldrefType( index ) + ")V";
final int fieldWriterMethodIndex = constPool.addMethodrefInfo(
constPool.getThisClassInfo(),
EACH_WRITE_METHOD_PREFIX + fieldName,
fieldWriterMethodDescriptor
);
iter.writeByte( Opcode.INVOKEVIRTUAL, pos );
iter.write16bit( fieldWriterMethodIndex, pos + 1 );
return pos;
}
private static void addInvokeFieldHandlerMethod(
ClassFile classfile,
Bytecode code,
String typeName,
boolean isReadMethod) {
final ConstPool constPool = classfile.getConstPool();
// invokeinterface
final int callbackTypeIndex = constPool.addClassInfo( FIELD_HANDLER_TYPE_NAME );
if ( ( typeName.charAt( 0 ) == 'L' )
&& ( typeName.charAt( typeName.length() - 1 ) == ';' )
|| ( typeName.charAt( 0 ) == '[' ) ) {
// reference type
final int indexOfL = typeName.indexOf( 'L' );
String type;
if ( indexOfL == 0 ) {
// not array
type = typeName.substring( 1, typeName.length() - 1 );
type = type.replace( '/', '.' );
}
else if ( indexOfL == -1 ) {
// array of primitive type
// do nothing
type = typeName;
}
else {
// array of reference type
type = typeName.replace( '/', '.' );
}
if ( isReadMethod ) {
code.addInvokeinterface(
callbackTypeIndex,
"readObject",
"(Ljava/lang/Object;Ljava/lang/String;Ljava/lang/Object;)Ljava/lang/Object;",
4
);
// checkcast
code.addCheckcast( type );
}
else {
code.addInvokeinterface(
callbackTypeIndex,
"writeObject",
"(Ljava/lang/Object;Ljava/lang/String;Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;",
5
);
// checkcast
code.addCheckcast( type );
}
}
else if ( typeName.equals( "Z" ) ) {
// boolean
if ( isReadMethod ) {
code.addInvokeinterface(
callbackTypeIndex,
"readBoolean",
"(Ljava/lang/Object;Ljava/lang/String;Z)Z",
4
);
}
else {
code.addInvokeinterface(
callbackTypeIndex,
"writeBoolean",
"(Ljava/lang/Object;Ljava/lang/String;ZZ)Z",
5
);
}
}
else if ( typeName.equals( "B" ) ) {
// byte
if ( isReadMethod ) {
code.addInvokeinterface(
callbackTypeIndex,
"readByte",
"(Ljava/lang/Object;Ljava/lang/String;B)B",
4
);
}
else {
code.addInvokeinterface(
callbackTypeIndex,
"writeByte",
"(Ljava/lang/Object;Ljava/lang/String;BB)B",
5
);
}
}
else if ( typeName.equals( "C" ) ) {
// char
if ( isReadMethod ) {
code.addInvokeinterface(
callbackTypeIndex,
"readChar",
"(Ljava/lang/Object;Ljava/lang/String;C)C",
4
);
}
else {
code.addInvokeinterface(
callbackTypeIndex,
"writeChar",
"(Ljava/lang/Object;Ljava/lang/String;CC)C",
5
);
}
}
else if ( typeName.equals( "I" ) ) {
// int
if ( isReadMethod ) {
code.addInvokeinterface(
callbackTypeIndex,
"readInt",
"(Ljava/lang/Object;Ljava/lang/String;I)I",
4
);
}
else {
code.addInvokeinterface(
callbackTypeIndex,
"writeInt",
"(Ljava/lang/Object;Ljava/lang/String;II)I",
5
);
}
}
else if ( typeName.equals( "S" ) ) {
// short
if ( isReadMethod ) {
code.addInvokeinterface(
callbackTypeIndex,
"readShort",
"(Ljava/lang/Object;Ljava/lang/String;S)S",
4
);
}
else {
code.addInvokeinterface(
callbackTypeIndex,
"writeShort",
"(Ljava/lang/Object;Ljava/lang/String;SS)S",
5
);
}
}
else if ( typeName.equals( "D" ) ) {
// double
if ( isReadMethod ) {
code.addInvokeinterface(
callbackTypeIndex,
"readDouble",
"(Ljava/lang/Object;Ljava/lang/String;D)D",
5
);
}
else {
code.addInvokeinterface(
callbackTypeIndex,
"writeDouble",
"(Ljava/lang/Object;Ljava/lang/String;DD)D",
7
);
}
}
else if ( typeName.equals( "F" ) ) {
// float
if ( isReadMethod ) {
code.addInvokeinterface(
callbackTypeIndex,
"readFloat",
"(Ljava/lang/Object;Ljava/lang/String;F)F",
4
);
}
else {
code.addInvokeinterface(
callbackTypeIndex,
"writeFloat",
"(Ljava/lang/Object;Ljava/lang/String;FF)F",
5
);
}
}
else if ( typeName.equals( "J" ) ) {
// long
if ( isReadMethod ) {
code.addInvokeinterface(
callbackTypeIndex,
"readLong",
"(Ljava/lang/Object;Ljava/lang/String;J)J",
5
);
}
else {
code.addInvokeinterface(
callbackTypeIndex,
"writeLong",
"(Ljava/lang/Object;Ljava/lang/String;JJ)J",
7
);
}
}
else {
// bad type
throw new RuntimeException( "bad type: " + typeName );
}
}
private static void addTypeDependDataLoad(Bytecode code, String typeName, int i) {
if ( typeName.charAt( 0 ) == 'L'
&& typeName.charAt( typeName.length() - 1 ) == ';'
|| typeName.charAt( 0 ) == '[' ) {
// reference type
code.addAload( i );
}
else if ( typeName.equals( "Z" )
|| typeName.equals( "B" )
|| typeName.equals( "C" )
|| typeName.equals( "I" )
|| typeName.equals( "S" ) ) {
// boolean, byte, char, int, short
code.addIload( i );
}
else if ( typeName.equals( "D" ) ) {
// double
code.addDload( i );
}
else if ( typeName.equals( "F" ) ) {
// float
code.addFload( i );
}
else if ( typeName.equals( "J" ) ) {
// long
code.addLload( i );
}
else {
// bad type
throw new RuntimeException( "bad type: " + typeName );
}
}
private static void addTypeDependDataStore(Bytecode code, String typeName, int i) {
if ( typeName.charAt( 0 ) == 'L'
&& typeName.charAt( typeName.length() - 1 ) == ';'
|| typeName.charAt( 0 ) == '[' ) {
// reference type
code.addAstore( i );
}
else if ( typeName.equals( "Z" )
|| typeName.equals( "B" )
|| typeName.equals( "C" )
|| typeName.equals( "I" )
|| typeName.equals( "S" ) ) {
// boolean, byte, char, int, short
code.addIstore( i );
}
else if ( typeName.equals( "D" ) ) {
// double
code.addDstore( i );
}
else if ( typeName.equals( "F" ) ) {
// float
code.addFstore( i );
}
else if ( typeName.equals( "J" ) ) {
// long
code.addLstore( i );
}
else {
// bad type
throw new RuntimeException( "bad type: " + typeName );
}
}
private static void addTypeDependDataReturn(Bytecode code, String typeName) {
if ( typeName.charAt( 0 ) == 'L'
&& typeName.charAt( typeName.length() - 1 ) == ';'
|| typeName.charAt( 0 ) == '[') {
// reference type
code.addOpcode( Opcode.ARETURN );
}
else if ( typeName.equals( "Z" )
|| typeName.equals( "B" )
|| typeName.equals( "C" )
|| typeName.equals( "I" )
|| typeName.equals( "S" ) ) {
// boolean, byte, char, int, short
code.addOpcode( Opcode.IRETURN );
}
else if ( typeName.equals( "D" ) ) {
// double
code.addOpcode( Opcode.DRETURN );
}
else if ( typeName.equals( "F" ) ) {
// float
code.addOpcode( Opcode.FRETURN );
}
else if ( typeName.equals( "J" ) ) {
// long
code.addOpcode( Opcode.LRETURN );
}
else {
// bad type
throw new RuntimeException( "bad type: " + typeName );
}
}
}
