javassist.bytecode.Opcode Java Examples
The following examples show how to use
javassist.bytecode.Opcode.
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Example #1
| Source File: BulkAccessorFactory.java From lams with GNU General Public License v2.0 | 6 votes |
|
/**
* Declares a constructor that takes no parameter.
*
* @param classfile The class descriptor
*
* @throws CannotCompileException Indicates trouble with the underlying Javassist calls
*/
private void addDefaultConstructor(ClassFile classfile) throws CannotCompileException {
final ConstPool constPool = classfile.getConstPool();
final String constructorSignature = "()V";
final MethodInfo constructorMethodInfo = new MethodInfo( constPool, MethodInfo.nameInit, constructorSignature );
final Bytecode code = new Bytecode( constPool, 0, 1 );
// aload_0
code.addAload( 0 );
// invokespecial
code.addInvokespecial( BulkAccessor.class.getName(), MethodInfo.nameInit, constructorSignature );
// return
code.addOpcode( Opcode.RETURN );
constructorMethodInfo.setCodeAttribute( code.toCodeAttribute() );
constructorMethodInfo.setAccessFlags( AccessFlag.PUBLIC );
classfile.addMethod( constructorMethodInfo );
}
Example #2
| Source File: BulkAccessorFactory.java From cacheonix-core with GNU Lesser General Public License v2.1 | 6 votes |
|
/**
* Declares a constructor that takes no parameter.
*
* @param classfile
* @throws CannotCompileException
*/
private void addDefaultConstructor(ClassFile classfile) throws CannotCompileException {
ConstPool cp = classfile.getConstPool();
String cons_desc = "()V";
MethodInfo mi = new MethodInfo( cp, MethodInfo.nameInit, cons_desc );
Bytecode code = new Bytecode( cp, 0, 1 );
// aload_0
code.addAload( 0 );
// invokespecial
code.addInvokespecial( BulkAccessor.class.getName(), MethodInfo.nameInit, cons_desc );
// return
code.addOpcode( Opcode.RETURN );
mi.setCodeAttribute( code.toCodeAttribute() );
mi.setAccessFlags( AccessFlag.PUBLIC );
classfile.addMethod( mi );
}
Example #3
| Source File: FieldTransformer.java From cacheonix-core with GNU Lesser General Public License v2.1 | 6 votes |
|
private void addGetFieldHandlerMethod(ClassFile classfile)
throws CannotCompileException {
ConstPool cp = classfile.getConstPool();
int this_class_index = cp.getThisClassInfo();
MethodInfo minfo = new MethodInfo(cp, GETFIELDHANDLER_METHOD_NAME,
GETFIELDHANDLER_METHOD_DESCRIPTOR);
/* local variable | this | */
Bytecode code = new Bytecode(cp, 2, 1);
// aload_0 // load this
code.addAload(0);
// getfield // get field "$JAVASSIST_CALLBACK" defined already
code.addOpcode(Opcode.GETFIELD);
int field_index = cp.addFieldrefInfo(this_class_index,
HANDLER_FIELD_NAME, HANDLER_FIELD_DESCRIPTOR);
code.addIndex(field_index);
// areturn // return the value of the field
code.addOpcode(Opcode.ARETURN);
minfo.setCodeAttribute(code.toCodeAttribute());
minfo.setAccessFlags(AccessFlag.PUBLIC);
classfile.addMethod(minfo);
}
Example #4
| Source File: FieldTransformer.java From cacheonix-core with GNU Lesser General Public License v2.1 | 6 votes |
|
private void addSetFieldHandlerMethod(ClassFile classfile)
throws CannotCompileException {
ConstPool cp = classfile.getConstPool();
int this_class_index = cp.getThisClassInfo();
MethodInfo minfo = new MethodInfo(cp, SETFIELDHANDLER_METHOD_NAME,
SETFIELDHANDLER_METHOD_DESCRIPTOR);
/* local variables | this | callback | */
Bytecode code = new Bytecode(cp, 3, 3);
// aload_0 // load this
code.addAload(0);
// aload_1 // load callback
code.addAload(1);
// putfield // put field "$JAVASSIST_CALLBACK" defined already
code.addOpcode(Opcode.PUTFIELD);
int field_index = cp.addFieldrefInfo(this_class_index,
HANDLER_FIELD_NAME, HANDLER_FIELD_DESCRIPTOR);
code.addIndex(field_index);
// return
code.addOpcode(Opcode.RETURN);
minfo.setCodeAttribute(code.toCodeAttribute());
minfo.setAccessFlags(AccessFlag.PUBLIC);
classfile.addMethod(minfo);
}
Example #5
| Source File: FieldTransformer.java From cacheonix-core with GNU Lesser General Public License v2.1 | 6 votes |
|
private int transformInvokevirtualsIntoGetfields(ClassFile classfile,
CodeIterator iter, int pos) {
ConstPool cp = classfile.getConstPool();
int c = iter.byteAt(pos);
if (c != Opcode.GETFIELD) {
return pos;
}
int index = iter.u16bitAt(pos + 1);
String fieldName = cp.getFieldrefName(index);
String className = cp.getFieldrefClassName(index);
if ((!classfile.getName().equals(className))
|| (!readableFields.containsKey(fieldName))) {
return pos;
}
String desc = "()" + (String) readableFields.get(fieldName);
int read_method_index = cp.addMethodrefInfo(cp.getThisClassInfo(),
EACH_READ_METHOD_PREFIX + fieldName, desc);
iter.writeByte(Opcode.INVOKEVIRTUAL, pos);
iter.write16bit(read_method_index, pos + 1);
return pos;
}
Example #6
| Source File: FieldTransformer.java From cacheonix-core with GNU Lesser General Public License v2.1 | 6 votes |
|
private int transformInvokevirtualsIntoPutfields(ClassFile classfile,
CodeIterator iter, int pos) {
ConstPool cp = classfile.getConstPool();
int c = iter.byteAt(pos);
if (c != Opcode.PUTFIELD) {
return pos;
}
int index = iter.u16bitAt(pos + 1);
String fieldName = cp.getFieldrefName(index);
String className = cp.getFieldrefClassName(index);
if ((!classfile.getName().equals(className))
|| (!writableFields.containsKey(fieldName))) {
return pos;
}
String desc = "(" + (String) writableFields.get(fieldName) + ")V";
int write_method_index = cp.addMethodrefInfo(cp.getThisClassInfo(),
EACH_WRITE_METHOD_PREFIX + fieldName, desc);
iter.writeByte(Opcode.INVOKEVIRTUAL, pos);
iter.write16bit(write_method_index, pos + 1);
return pos;
}
Example #7
| Source File: FieldTransformer.java From cacheonix-core with GNU Lesser General Public License v2.1 | 6 votes |
|
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);
}
}
Example #8
| Source File: JavassistPerfTest.java From annotation-tools with MIT License | 5 votes |
|
byte[] counterAdaptClass(final InputStream is, final String name)
throws Exception
{
CtClass cc = pool.makeClass(is);
if (!cc.isInterface()) {
cc.addField(new CtField(CtClass.intType, "_counter", cc));
}
CtMethod[] ms = cc.getDeclaredMethods();
for (int j = 0; j < ms.length; ++j) {
CtMethod m = ms[j];
int modifiers = m.getModifiers();
if (!Modifier.isStatic(modifiers)
&& !Modifier.isAbstract(modifiers)
&& !Modifier.isNative(modifiers))
{
if (!m.isEmpty()) {
MethodInfo info = m.getMethodInfo();
Bytecode bc = new Bytecode(info.getConstPool(), 1, 0);
bc.addAload(0);
bc.addAload(0);
bc.addGetfield(cc, "_counter", "I");
bc.add(Opcode.ICONST_1);
bc.add(Opcode.IADD);
bc.addPutfield(cc, "_counter", "I");
CodeIterator iter = info.getCodeAttribute().iterator();
iter.begin();
iter.insert(bc.get());
}
}
}
return cc.toBytecode();
}
Example #9
| Source File: JavassistPerfTest.java From annotation-tools with MIT License | 5 votes |
|
byte[] counterAdaptClass(final InputStream is, final String name)
throws Exception
{
CtClass cc = pool.makeClass(is);
if (!cc.isInterface()) {
cc.addField(new CtField(CtClass.intType, "_counter", cc));
}
CtMethod[] ms = cc.getDeclaredMethods();
for (int j = 0; j < ms.length; ++j) {
CtMethod m = ms[j];
int modifiers = m.getModifiers();
if (!Modifier.isStatic(modifiers)
&& !Modifier.isAbstract(modifiers)
&& !Modifier.isNative(modifiers))
{
if (!m.isEmpty()) {
MethodInfo info = m.getMethodInfo();
Bytecode bc = new Bytecode(info.getConstPool(), 1, 0);
bc.addAload(0);
bc.addAload(0);
bc.addGetfield(cc, "_counter", "I");
bc.add(Opcode.ICONST_1);
bc.add(Opcode.IADD);
bc.addPutfield(cc, "_counter", "I");
CodeIterator iter = info.getCodeAttribute().iterator();
iter.begin();
iter.insert(bc.get());
}
}
}
return cc.toBytecode();
}
Example #10
| Source File: LocalvariablesNamesEnhancer.java From restcommander with Apache License 2.0 | 5 votes |
|
/**
* Debug utility. Display a byte code op as plain text.
*/
public static void printOp(int op) {
try {
for (Field f : Opcode.class.getDeclaredFields()) {
if (java.lang.reflect.Modifier.isStatic(f.getModifiers()) && java.lang.reflect.Modifier.isPublic(f.getModifiers()) && f.getInt(null) == op) {
System.out.println(op + " " + f.getName());
}
}
} catch (Exception e) {
}
}
Example #11
| Source File: BulkAccessorFactory.java From lams with GNU General Public License v2.0 | 4 votes |
|
private void addGetter(ClassFile classfile, final Method[] getters) throws CannotCompileException {
final ConstPool constPool = classfile.getConstPool();
final int targetBeanConstPoolIndex = constPool.addClassInfo( this.targetBean.getName() );
final String desc = GET_SETTER_DESC;
final MethodInfo getterMethodInfo = new MethodInfo( constPool, GENERATED_GETTER_NAME, desc );
final Bytecode code = new Bytecode( constPool, 6, 4 );
/* | this | bean | args | raw bean | */
if ( getters.length >= 0 ) {
// aload_1 // load bean
code.addAload( 1 );
// checkcast // cast bean
code.addCheckcast( this.targetBean.getName() );
// astore_3 // store bean
code.addAstore( 3 );
for ( int i = 0; i < getters.length; ++i ) {
if ( getters[i] != null ) {
final Method getter = getters[i];
// aload_2 // args
code.addAload( 2 );
// iconst_i // continue to aastore
// growing stack is 1
code.addIconst( i );
final Class returnType = getter.getReturnType();
int typeIndex = -1;
if ( returnType.isPrimitive() ) {
typeIndex = FactoryHelper.typeIndex( returnType );
// new
code.addNew( FactoryHelper.wrapperTypes[typeIndex] );
// dup
code.addOpcode( Opcode.DUP );
}
// aload_3 // load the raw bean
code.addAload( 3 );
final String getterSignature = RuntimeSupport.makeDescriptor( getter );
final String getterName = getter.getName();
if ( this.targetBean.isInterface() ) {
// invokeinterface
code.addInvokeinterface( targetBeanConstPoolIndex, getterName, getterSignature, 1 );
}
else {
// invokevirtual
code.addInvokevirtual( targetBeanConstPoolIndex, getterName, getterSignature );
}
if ( typeIndex >= 0 ) {
// is a primitive type
// invokespecial
code.addInvokespecial(
FactoryHelper.wrapperTypes[typeIndex],
MethodInfo.nameInit,
FactoryHelper.wrapperDesc[typeIndex]
);
}
// aastore // args
code.add( Opcode.AASTORE );
code.growStack( -3 );
}
}
}
// return
code.addOpcode( Opcode.RETURN );
getterMethodInfo.setCodeAttribute( code.toCodeAttribute() );
getterMethodInfo.setAccessFlags( AccessFlag.PUBLIC );
classfile.addMethod( getterMethodInfo );
}
Example #12
| Source File: BulkAccessorFactory.java From cacheonix-core with GNU Lesser General Public License v2.1 | 4 votes |
|
private void addGetter(ClassFile classfile, final Method[] getters) throws CannotCompileException {
ConstPool cp = classfile.getConstPool();
int target_type_index = cp.addClassInfo( this.targetBean.getName() );
String desc = GET_SETTER_DESC;
MethodInfo mi = new MethodInfo( cp, GENERATED_GETTER_NAME, desc );
Bytecode code = new Bytecode( cp, 6, 4 );
/* | this | bean | args | raw bean | */
if ( getters.length >= 0 ) {
// aload_1 // load bean
code.addAload( 1 );
// checkcast // cast bean
code.addCheckcast( this.targetBean.getName() );
// astore_3 // store bean
code.addAstore( 3 );
for ( int i = 0; i < getters.length; ++i ) {
if ( getters[i] != null ) {
Method getter = getters[i];
// aload_2 // args
code.addAload( 2 );
// iconst_i // continue to aastore
code.addIconst( i ); // growing stack is 1
Class returnType = getter.getReturnType();
int typeIndex = -1;
if ( returnType.isPrimitive() ) {
typeIndex = FactoryHelper.typeIndex( returnType );
// new
code.addNew( FactoryHelper.wrapperTypes[typeIndex] );
// dup
code.addOpcode( Opcode.DUP );
}
// aload_3 // load the raw bean
code.addAload( 3 );
String getter_desc = RuntimeSupport.makeDescriptor( getter );
String getterName = getter.getName();
if ( this.targetBean.isInterface() ) {
// invokeinterface
code.addInvokeinterface( target_type_index, getterName, getter_desc, 1 );
}
else {
// invokevirtual
code.addInvokevirtual( target_type_index, getterName, getter_desc );
}
if ( typeIndex >= 0 ) { // is a primitive type
// invokespecial
code.addInvokespecial(
FactoryHelper.wrapperTypes[typeIndex],
MethodInfo.nameInit,
FactoryHelper.wrapperDesc[typeIndex]
);
}
// aastore // args
code.add( Opcode.AASTORE );
code.growStack( -3 );
}
}
}
// return
code.addOpcode( Opcode.RETURN );
mi.setCodeAttribute( code.toCodeAttribute() );
mi.setAccessFlags( AccessFlag.PUBLIC );
classfile.addMethod( mi );
}
Example #13
| Source File: FieldTransformer.java From cacheonix-core with GNU Lesser General Public License v2.1 | 4 votes |
|
private void addReadMethod(ClassFile classfile, FieldInfo finfo)
throws CannotCompileException {
ConstPool cp = classfile.getConstPool();
int this_class_index = cp.getThisClassInfo();
String desc = "()" + finfo.getDescriptor();
MethodInfo minfo = new MethodInfo(cp, EACH_READ_METHOD_PREFIX
+ finfo.getName(), desc);
/* local variables | target obj | each oldvalue | */
Bytecode code = new Bytecode(cp, 5, 3);
// aload_0
code.addAload(0);
// getfield // get each field
code.addOpcode(Opcode.GETFIELD);
int base_field_index = cp.addFieldrefInfo(this_class_index, finfo
.getName(), finfo.getDescriptor());
code.addIndex(base_field_index);
// aload_0
code.addAload(0);
// invokeinterface // invoke Enabled.getInterceptFieldCallback()
int enabled_class_index = cp.addClassInfo(FIELD_HANDLED_TYPE_NAME);
code.addInvokeinterface(enabled_class_index,
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(enabled_class_index,
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());
minfo.setCodeAttribute(code.toCodeAttribute());
minfo.setAccessFlags(AccessFlag.PUBLIC);
classfile.addMethod(minfo);
}
Example #14
| Source File: FieldTransformer.java From cacheonix-core with GNU Lesser General Public License v2.1 | 4 votes |
|
private void addWriteMethod(ClassFile classfile, FieldInfo finfo)
throws CannotCompileException {
ConstPool cp = classfile.getConstPool();
int this_class_index = cp.getThisClassInfo();
String desc = "(" + finfo.getDescriptor() + ")V";
MethodInfo minfo = new MethodInfo(cp, EACH_WRITE_METHOD_PREFIX
+ finfo.getName(), desc);
/* local variables | target obj | each oldvalue | */
Bytecode code = new Bytecode(cp, 6, 3);
// aload_0
code.addAload(0);
// invokeinterface // enabled.getInterceptFieldCallback()
int enabled_class_index = cp.addClassInfo(FIELD_HANDLED_TYPE_NAME);
code.addInvokeinterface(enabled_class_index,
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);
int base_field_index = cp.addFieldrefInfo(this_class_index, finfo
.getName(), finfo.getDescriptor());
code.addIndex(base_field_index);
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(enabled_class_index,
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(base_field_index);
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(base_field_index);
code.growStack(-Descriptor.dataSize(finfo.getDescriptor()));
// return
code.addOpcode(Opcode.RETURN);
minfo.setCodeAttribute(code.toCodeAttribute());
minfo.setAccessFlags(AccessFlag.PUBLIC);
classfile.addMethod(minfo);
}
