Java Code Examples for org.objectweb.asm.MethodVisitor#visitMaxs()
The following examples show how to use
org.objectweb.asm.MethodVisitor#visitMaxs() .
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Example 1
| Source File: ConstructorAssembler.java From spring-boot-netty with MIT License | 6 votes |
|
public static void assembleConstructor(final Type invokerType, final String parentName, final ClassWriter cw) {
final MethodVisitor ctor = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
final Label cs = createLabel();
final Label ce = createLabel();
ctor.visitCode();
ctor.visitLabel(cs);
ctor.visitVarInsn(ALOAD, 0);
ctor.visitMethodInsn(INVOKESPECIAL, parentName, "<init>", "()V", false);
ctor.visitInsn(RETURN);
ctor.visitLabel(ce);
final String cn = invokerType.getDescriptor();
ctor.visitLocalVariable("this", cn, null, cs, ce, 0);
ctor.visitEnd();
ctor.visitMaxs(0, 0);
}
Example 2
| Source File: TileEntityRegistry.java From customstuff4 with GNU General Public License v3.0 | 6 votes |
|
private static byte[] generateClass(Class<? extends TileEntity> baseClass, String className, String contentId)
{
ClassWriter cw = new ClassWriter(0);
cw.visit(V1_7, ACC_PUBLIC + ACC_SUPER, className, null, Type.getInternalName(baseClass), null);
// Constructor
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitVarInsn(ALOAD, 0);
mv.visitLdcInsn(contentId);
mv.visitMethodInsn(INVOKESPECIAL, Type.getInternalName(baseClass), "<init>", "(Ljava/lang/String;)V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(2, 1);
mv.visitEnd();
return cw.toByteArray();
}
Example 3
| Source File: IncludingClassVisitor.java From OpenModsLib with MIT License | 6 votes |
|
public void addMethod(ClassVisitor target, Method method) {
MethodVisitor mv = target.visitMethod(Opcodes.ACC_PUBLIC | Opcodes.ACC_SYNTHETIC,
method.getName(),
method.getDescriptor(),
null, null);
mv.visitVarInsn(Opcodes.ALOAD, 0);
visitInterfaceAccess(mv);
// should have interface reference on stack
// checkcast just to be safe
mv.visitTypeInsn(Opcodes.CHECKCAST, intf.getInternalName());
Type[] args = method.getArgumentTypes();
for (int i = 0; i < args.length; i++)
mv.visitVarInsn(args[i].getOpcode(Opcodes.ILOAD), i + 1);
mv.visitMethodInsn(Opcodes.INVOKEINTERFACE, intf.getInternalName(), method.getName(), method.getDescriptor(), true);
Type returnType = method.getReturnType();
mv.visitInsn(returnType.getOpcode(Opcodes.IRETURN));
mv.visitMaxs(args.length + 1, args.length + 1);
mv.visitEnd();
}
Example 4
| Source File: StringFogClassVisitor.java From StringFog with Apache License 2.0 | 6 votes |
|
@Override
public void visitEnd() {
if (!mIgnoreClass && !isClInitExists && !mStaticFinalFields.isEmpty()) {
MethodVisitor mv = super.visitMethod(Opcodes.ACC_STATIC, "<clinit>", "()V", null, null);
mv.visitCode();
// Here init static final fields.
for (ClassStringField field : mStaticFinalFields) {
if (!canEncrypted(field.value)) {
continue;
}
String originValue = field.value;
String encryptValue = mStringFogImpl.encrypt(originValue, mKey);
mMappingPrinter.output(getJavaClassName(), originValue, encryptValue);
mv.visitLdcInsn(encryptValue);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, mFogClassName, "decrypt", "(Ljava/lang/String;)Ljava/lang/String;", false);
mv.visitFieldInsn(Opcodes.PUTSTATIC, mClassName, field.name, ClassStringField.STRING_DESC);
}
mv.visitInsn(Opcodes.RETURN);
mv.visitMaxs(1, 0);
mv.visitEnd();
}
super.visitEnd();
}
Example 5
| Source File: EventSubclassTransformer.java From patchwork-patcher with GNU Lesser General Public License v3.0 | 6 votes |
|
/**
* Adds a public marker method that returns true.
*
* <p>It appears like so: <pre>
* public boolean name() {
* return true;
* }
* </pre></p>
*
* @param name The name of the generated method
*/
private void visitMarkerMethod(String name) {
MethodVisitor isCancelable = super.visitMethod(Opcodes.ACC_PUBLIC, name, BOOLEAN_DESCRIPTOR, null, null);
if (isCancelable != null) {
AnnotationVisitor override = isCancelable.visitAnnotation("Ljava/lang/Override;", true);
if (override != null) {
override.visitEnd();
}
isCancelable.visitInsn(Opcodes.ICONST_1);
isCancelable.visitInsn(Opcodes.IRETURN);
isCancelable.visitMaxs(2, 1);
isCancelable.visitEnd();
}
}
Example 6
| Source File: AClassWithBadMethodDump.java From openpojo with Apache License 2.0 | 5 votes |
|
public static byte[] dump(String className) throws Exception {
ClassWriter cw = new ClassWriter(0);
FieldVisitor fv;
MethodVisitor mv;
AnnotationVisitor av0;
cw.visit(V1_5, ACC_PUBLIC + ACC_SUPER,
className, null, "java/lang/Object",
null);
{
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
{
mv = cw.visitMethod(ACC_PRIVATE, "badMethod", "()V", null, null);
mv.visitCode();
mv.visitLdcInsn("Should not return on void");
mv.visitInsn(ARETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
cw.visitEnd();
return cw.toByteArray();
}
Example 7
| Source File: ImplHelper.java From panama-layout-prototype with Eclipse Public License 1.0 | 5 votes |
|
static void getLayoutImpl(ClassVisitor cw, MethodVisitor mv, String typeName) {
{
mv = cw.visitMethod(ACC_PUBLIC, "copyFrom", "(Lcom/ibm/layout/Layout;)V", null, null);
mv.visitCode();
mv.visitFieldInsn(GETSTATIC, typeName, "unsafe", "Lsun/misc/Unsafe;");
mv.visitVarInsn(ALOAD, 1);
mv.visitTypeInsn(CHECKCAST, typeName);
mv.visitFieldInsn(GETFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "getData", "()[B", false);
mv.visitVarInsn(ALOAD, 1);
mv.visitTypeInsn(CHECKCAST, typeName);
mv.visitFieldInsn(GETFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "getOffset", "()J", false);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "getData", "()[B", false);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "getOffset", "()J", false);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKEVIRTUAL, typeName, "sizeof", "()J", false);
mv.visitMethodInsn(INVOKEVIRTUAL, "sun/misc/Unsafe", "copyMemory", "(Ljava/lang/Object;JLjava/lang/Object;JJ)V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(9, 2);
mv.visitEnd();
}
}
Example 8
| Source File: InterfaceFieldClassGeneratorTest.java From AVM with MIT License | 5 votes |
|
public static byte[] getNestedInterfaceCalledFIELDSLevelTwo() {
ClassWriter classWriter = new ClassWriter(0);
FieldVisitor fieldVisitor;
MethodVisitor methodVisitor;
classWriter.visit(V10, ACC_PUBLIC | ACC_ABSTRACT | ACC_INTERFACE, "NestedInterfaces$FIELDS$FIELDS", null, "java/lang/Object", null);
classWriter.visitSource("NestedInterfaces.java", null);
classWriter.visitInnerClass("NestedInterfaces$FIELDS", "NestedInterfaces", "FIELDS", ACC_STATIC | ACC_ABSTRACT | ACC_INTERFACE);
classWriter.visitInnerClass("NestedInterfaces$FIELDS$FIELDS", "NestedInterfaces$FIELDS", "FIELDS", ACC_PUBLIC | ACC_STATIC | ACC_ABSTRACT | ACC_INTERFACE);
{
fieldVisitor = classWriter.visitField(ACC_PUBLIC | ACC_FINAL | ACC_STATIC, "b", "I", null, null);
fieldVisitor.visitEnd();
}
{
methodVisitor = classWriter.visitMethod(ACC_STATIC, "<clinit>", "()V", null, null);
methodVisitor.visitCode();
Label label0 = new Label();
methodVisitor.visitLabel(label0);
methodVisitor.visitLineNumber(7, label0);
methodVisitor.visitTypeInsn(NEW, "java/lang/Object");
methodVisitor.visitInsn(DUP);
methodVisitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
methodVisitor.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "hashCode", "()I", false);
methodVisitor.visitFieldInsn(PUTSTATIC, "NestedInterfaces$FIELDS$FIELDS", "b", "I");
methodVisitor.visitInsn(RETURN);
methodVisitor.visitMaxs(2, 0);
methodVisitor.visitEnd();
}
classWriter.visitEnd();
return classWriter.toByteArray();
}
Example 9
| Source File: RegisterObjectHolders.java From patchwork-patcher with GNU Lesser General Public License v3.0 | 5 votes |
|
@Override
public void accept(MethodVisitor method) {
for (Map.Entry<String, ObjectHolder> entry : objectHolderEntries) {
String shimName = entry.getKey();
ObjectHolder holder = entry.getValue();
VanillaRegistry registry = VanillaRegistry.get(holder.getDescriptor());
String registerDescriptor = "(Lnet/minecraft/class_2378;Ljava/lang/String;Ljava/lang/String;Ljava/util/function/Consumer;)V";
method.visitFieldInsn(Opcodes.GETSTATIC, "net/patchworkmc/api/registries/ObjectHolderRegistry", "INSTANCE", "Lnet/patchworkmc/api/registries/ObjectHolderRegistry;");
if (registry == null) {
if (holder.getDescriptor().startsWith("Lnet/minecraft/class_")) {
Patchwork.LOGGER.warn("Don't know what registry the minecraft class " + holder.getDescriptor() + " belongs to, falling back to dynamic!");
}
method.visitLdcInsn(Type.getObjectType(holder.getDescriptor().substring(1, holder.getDescriptor().length() - 1)));
registerDescriptor = "(Ljava/lang/Class;Ljava/lang/String;Ljava/lang/String;Ljava/util/function/Consumer;)V";
} else {
method.visitFieldInsn(Opcodes.GETSTATIC, REGISTRY, registry.getField(), registry.getFieldDescriptor());
}
method.visitLdcInsn(holder.getNamespace());
method.visitLdcInsn(holder.getName());
method.visitTypeInsn(Opcodes.NEW, shimName);
method.visitInsn(Opcodes.DUP);
method.visitMethodInsn(Opcodes.INVOKESPECIAL, shimName, "<init>", "()V", false);
method.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "net/patchworkmc/api/registries/ObjectHolderRegistry", "register", registerDescriptor, false);
}
method.visitInsn(Opcodes.RETURN);
method.visitMaxs(6, 0);
method.visitEnd();
}
Example 10
| Source File: ConstructorGenerator.java From yql-plus with Apache License 2.0 | 5 votes |
|
@Override
public void generate(ClassVisitor cw) {
CodeEmitter out = new CodeEmitter(unit, arguments, createMethod(cw));
MethodVisitor mv = out.getMethodVisitor();
unit.getSuperInit().generate(out);
code.generate(out);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
Example 11
| Source File: ProxyGeneratorAdapter.java From groovy with Apache License 2.0 | 5 votes |
|
/**
* Generate a call to the delegate object.
*/
protected MethodVisitor makeDelegateCall(final String name, final String desc, final String signature, final String[] exceptions, final int accessFlags) {
MethodVisitor mv = super.visitMethod(accessFlags, name, desc, signature, exceptions);
mv.visitVarInsn(ALOAD, 0); // load this
mv.visitFieldInsn(GETFIELD, proxyName, DELEGATE_OBJECT_FIELD, BytecodeHelper.getTypeDescription(delegateClass)); // load delegate
// using InvokerHelper to allow potential intercepted calls
int size;
mv.visitLdcInsn(name); // method name
Type[] args = Type.getArgumentTypes(desc);
BytecodeHelper.pushConstant(mv, args.length);
mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
size = 6;
int idx = 1;
for (int i = 0; i < args.length; i++) {
Type arg = args[i];
mv.visitInsn(DUP);
BytecodeHelper.pushConstant(mv, i);
// primitive types must be boxed
boxPrimitiveType(mv, idx, arg);
size = Math.max(size, 5 + registerLen(arg));
idx += registerLen(arg);
mv.visitInsn(AASTORE); // store value into array
}
mv.visitMethodInsn(INVOKESTATIC, "org/codehaus/groovy/runtime/InvokerHelper", "invokeMethod", "(Ljava/lang/Object;Ljava/lang/String;Ljava/lang/Object;)Ljava/lang/Object;", false);
unwrapResult(mv, desc);
mv.visitMaxs(size, registerLen(args) + 1);
return mv;
}
Example 12
| Source File: MethodAccessorEmitter.java From bazel with Apache License 2.0 | 5 votes |
|
/**
* Emits a synthetic overloaded constructor which delegates the construction logic to the source
* constructor. For example,
*
* <pre><code>
* class Foo {
* private Foo(A a) {...}
*
* // Synthetic overloaded constructor
* Foo(A a, NestCC var) {
* this(a);
* }
* }
* </code></pre>
*/
@Override
public MethodVisitor visitClassConstructor(MethodDeclInfo methodDeclInfo, ClassVisitor cv) {
ClassName nestCompanion = nestDigest.nestCompanion(methodDeclInfo.owner());
MethodDeclInfo constructorBridge = methodDeclInfo.bridgeOfConstructor(nestCompanion);
MethodVisitor mv = constructorBridge.accept(cv);
mv.visitCode();
mv.visitVarInsn(Opcodes.ALOAD, 0);
ImmutableList<Type> constructorBridgeArgTypes = constructorBridge.argumentTypes();
// Exclude last placeholder element loading.
for (int i = 0, slotOffset = 1; i < constructorBridgeArgTypes.size() - 1; i++) {
mv.visitVarInsn(constructorBridgeArgTypes.get(i).getOpcode(Opcodes.ILOAD), slotOffset);
slotOffset += constructorBridgeArgTypes.get(i).getSize();
}
mv.visitMethodInsn(
Opcodes.INVOKESPECIAL,
methodDeclInfo.ownerName(),
methodDeclInfo.name(),
methodDeclInfo.descriptor(),
/* isInterface= */ false);
mv.visitInsn(Opcodes.RETURN);
int slot = 0;
for (Type bridgeConstructorArgType : constructorBridgeArgTypes) {
slot += bridgeConstructorArgType.getSize();
}
mv.visitMaxs(slot, slot);
mv.visitEnd();
return mv;
}
Example 13
| Source File: OffHeapAugmentor.java From Concurnas with MIT License | 5 votes |
|
private void createConstuctorWithDefaultInit(){
//add initUncreatable and boolean[]
{//toBinary
MethodVisitor mv = super.visitMethod(ACC_PUBLIC, "<init>", "(Lcom/concurnas/bootstrap/runtime/InitUncreatable;[Z)V", null, null);
mv.visitCode();
mv.visitLabel(new Label());
mv.visitVarInsn(ALOAD, 0);
if(superclassname.equals("java/lang/Object")){
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
}else if(superclassname.equals("com/concurnas/bootstrap/runtime/cps/CObject")){
mv.visitMethodInsn(INVOKESPECIAL, "com/concurnas/bootstrap/runtime/cps/CObject", "<init>", "()V");
}else{
mv.visitVarInsn(ALOAD, 1);
mv.visitVarInsn(ALOAD, 2);
mv.visitMethodInsn(INVOKESPECIAL, superclassname, "<init>", "(Lcom/concurnas/bootstrap/runtime/InitUncreatable;[Z)V");
}
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitVarInsn(ALOAD, 2);
mv.visitMethodInsn(INVOKESPECIAL, classname, "defaultFieldInit$", "(Lcom/concurnas/bootstrap/runtime/InitUncreatable;[Z)V");
mv.visitInsn(RETURN);
mv.visitMaxs(2, 2);
mv.visitEnd();
}
}
Example 14
| Source File: ModuleFood.java From TFC2 with GNU General Public License v3.0 | 5 votes |
|
private boolean tryAddFieldGetter(ClassNode classNode, String methodName, String fieldName, String fieldDescriptor)
{
String methodDescriptor = ASMHelper.toMethodDescriptor(fieldDescriptor);
if (ASMHelper.findMethodNodeOfClass(classNode, methodName, methodDescriptor) != null)
return false;
MethodVisitor mv = classNode.visitMethod(Opcodes.ACC_PUBLIC, methodName, methodDescriptor, null, null);
mv.visitVarInsn(Opcodes.ALOAD, 0);
mv.visitFieldInsn(Opcodes.GETFIELD, ASMHelper.toInternalClassName(classNode.name), fieldName, fieldDescriptor);
mv.visitInsn(Type.getType(fieldDescriptor).getOpcode(Opcodes.IRETURN));
mv.visitMaxs(0, 0);
return true;
}
Example 15
| Source File: JCasClassConversion.java From uima-uimaj with Apache License 2.0 | 5 votes |
|
void genv3_classInit() {
MethodVisitor mv = cv.visitMethod(ACC_STATIC, "<clinit>", "()V", null, null);
genv3_commonStaticFieldInit(mv);
genv3_registerFeatures(mv);
mv.visitInsn(RETURN);
mv.visitMaxs(1, 0);
mv.visitEnd();
}
Example 16
| Source File: AsmClassAccess.java From jadira with Apache License 2.0 | 4 votes |
|
private static void enhanceForPutValueObject(ClassVisitor cw, String accessClassNm, String clazzNm, Field[] fields) {
int maxStack = 6;
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "putValue", "(Ljava/lang/Object;Ljava/lang/String;Ljava/lang/Object;)V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, accessClassNm, "fieldNames", "[Ljava/lang/String;");
mv.visitVarInsn(ALOAD, 2);
mv.visitMethodInsn(INVOKESTATIC, "java/util/Arrays", "binarySearch", "([Ljava/lang/Object;Ljava/lang/Object;)I");
mv.visitVarInsn(ISTORE, 4);
mv.visitVarInsn(ILOAD, 4);
if (fields.length > 0) {
maxStack = 5;
Label[] labels = constructLabels(fields);
Label defaultLabel = new Label();
mv.visitTableSwitchInsn(0, labels.length - 1, defaultLabel, labels);
for (int i = 0, n = labels.length; i < n; i++) {
Field field = fields[i];
mv.visitLabel(labels[i]);
mv.visitFrame(F_SAME, 0, null, 0, null);
mv.visitVarInsn(ALOAD, 1);
mv.visitTypeInsn(CHECKCAST, clazzNm);
mv.visitVarInsn(ALOAD, 3);
Type fieldType = Type.getType(field.getType());
switch (fieldType.getSort()) {
case Type.BOOLEAN:
mv.visitTypeInsn(CHECKCAST, "java/lang/Boolean");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Boolean", "booleanValue", "()Z");
break;
case Type.BYTE:
mv.visitTypeInsn(CHECKCAST, "java/lang/Byte");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Byte", "byteValue", "()B");
break;
case Type.CHAR:
mv.visitTypeInsn(CHECKCAST, "java/lang/Character");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Character", "charValue", "()C");
break;
case Type.SHORT:
mv.visitTypeInsn(CHECKCAST, "java/lang/Short");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Short", "shortValue", "()S");
break;
case Type.INT:
mv.visitTypeInsn(CHECKCAST, "java/lang/Integer");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Integer", "intValue", "()I");
break;
case Type.FLOAT:
mv.visitTypeInsn(CHECKCAST, "java/lang/Float");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Float", "floatValue", "()F");
break;
case Type.LONG:
mv.visitTypeInsn(CHECKCAST, "java/lang/Long");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Long", "longValue", "()J");
break;
case Type.DOUBLE:
mv.visitTypeInsn(CHECKCAST, "java/lang/Double");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Double", "doubleValue", "()D");
break;
case Type.ARRAY:
mv.visitTypeInsn(CHECKCAST, fieldType.getDescriptor());
break;
case Type.OBJECT:
mv.visitTypeInsn(CHECKCAST, fieldType.getInternalName());
break;
}
mv.visitFieldInsn(PUTFIELD, clazzNm, field.getName(), fieldType.getDescriptor());
mv.visitInsn(RETURN);
}
mv.visitLabel(defaultLabel);
mv.visitFrame(F_SAME, 0, null, 0, null);
} else {
maxStack = 6;
}
enhanceForThrowingException(mv, IllegalArgumentException.class, "Field was not found", "Ljava/lang/Object;", ALOAD, 2);
mv.visitMaxs(maxStack, 5);
mv.visitEnd();
}
Example 17
| Source File: RetroWeaver.java From CodenameOne with GNU General Public License v2.0 | 4 votes |
|
public void visitEnd() {
if (isEnum) {
cv.visitField(ACC_PRIVATE + ACC_STATIC + ACC_FINAL + ACC_SYNTHETIC,
SERIAL_ID_FIELD,
SERIAL_ID_SIGNATURE,
null, new Long(0L));
}
if (!classLiteralCalls.isEmpty()) {
// generate synthetic fields and class$ method
for(String fieldName: classLiteralCalls) {
FieldVisitor fv = visitField(ACC_STATIC + ACC_SYNTHETIC
+ (isInterface?ACC_PUBLIC:ACC_PRIVATE),
fieldName,
CLASS_FIELD_DESC,
null, null);
fv.visitEnd();
}
if (!isInterface) {
// "class$" method
MethodVisitor mv = cv.visitMethod(ACC_STATIC+ACC_SYNTHETIC,
"class$",
"(Ljava/lang/String;)Ljava/lang/Class;",
null, null);
/*mv.visitCode();
Label beginTry = new Label();
Label endTry = new Label();
Label catchBlock = new Label();
Label finished = new Label();
mv.visitTryCatchBlock(beginTry, endTry, catchBlock, "java/lang/Exception");
mv.visitLabel(beginTry);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Class", "forName", "(Ljava/lang/String;)Ljava/lang/Class;");
mv.visitLabel(endTry);
mv.visitJumpInsn(GOTO, finished);
mv.visitLabel(catchBlock);
mv.visitInsn(POP);
mv.visitLabel(finished);
mv.visitInsn(ARETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();*/
mv.visitCode();
Label l0 = new Label();
Label l1 = new Label();
Label l2 = new Label();
mv.visitTryCatchBlock(l0, l1, l2, "java/lang/ClassNotFoundException");
mv.visitLabel(l0);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Class", "forName", "(Ljava/lang/String;)Ljava/lang/Class;");
mv.visitLabel(l1);
mv.visitInsn(ARETURN);
mv.visitLabel(l2);
mv.visitVarInsn(ASTORE, 1);
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ARETURN);
/*mv.visitTypeInsn(NEW, "java/lang/NoClassDefFoundError");
mv.visitInsn(DUP);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/NoClassDefFoundError", "<init>", "()V");
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/NoClassDefFoundError", "initCause", "(Ljava/lang/Throwable;)Ljava/lang/Throwable;");
mv.visitInsn(ATHROW);*/
mv.visitMaxs(2, 2);
mv.visitEnd();
}
}
if (!stripAttributes) {
RetroWeaverAttribute a = new RetroWeaverAttribute(Weaver.getBuildNumber(), originalClassVersion);
cv.visitAttribute(a);
}
cv.visitEnd();
}
Example 18
| Source File: FieldAccess.java From reflectasm with BSD 3-Clause "New" or "Revised" License | 4 votes |
|
static private void insertSetPrimitive (ClassWriter cw, String classNameInternal, ArrayList<Field> fields,
Type primitiveType) {
int maxStack = 6;
int maxLocals = 4; // See correction below for LLOAD and DLOAD
final String setterMethodName;
final String typeNameInternal = primitiveType.getDescriptor();
final int loadValueInstruction;
switch (primitiveType.getSort()) {
case Type.BOOLEAN:
setterMethodName = "setBoolean";
loadValueInstruction = ILOAD;
break;
case Type.BYTE:
setterMethodName = "setByte";
loadValueInstruction = ILOAD;
break;
case Type.CHAR:
setterMethodName = "setChar";
loadValueInstruction = ILOAD;
break;
case Type.SHORT:
setterMethodName = "setShort";
loadValueInstruction = ILOAD;
break;
case Type.INT:
setterMethodName = "setInt";
loadValueInstruction = ILOAD;
break;
case Type.FLOAT:
setterMethodName = "setFloat";
loadValueInstruction = FLOAD;
break;
case Type.LONG:
setterMethodName = "setLong";
loadValueInstruction = LLOAD;
maxLocals++; // (LLOAD and DLOAD actually load two slots)
break;
case Type.DOUBLE:
setterMethodName = "setDouble";
loadValueInstruction = DLOAD;
maxLocals++; // (LLOAD and DLOAD actually load two slots)
break;
default:
setterMethodName = "set";
loadValueInstruction = ALOAD;
break;
}
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, setterMethodName, "(Ljava/lang/Object;I" + typeNameInternal + ")V", null,
null);
mv.visitCode();
mv.visitVarInsn(ILOAD, 2);
if (!fields.isEmpty()) {
maxStack--;
Label[] labels = new Label[fields.size()];
Label labelForInvalidTypes = new Label();
boolean hasAnyBadTypeLabel = false;
for (int i = 0, n = labels.length; i < n; i++) {
if (Type.getType(fields.get(i).getType()).equals(primitiveType))
labels[i] = new Label();
else {
labels[i] = labelForInvalidTypes;
hasAnyBadTypeLabel = true;
}
}
Label defaultLabel = new Label();
mv.visitTableSwitchInsn(0, labels.length - 1, defaultLabel, labels);
for (int i = 0, n = labels.length; i < n; i++) {
if (!labels[i].equals(labelForInvalidTypes)) {
Field field = fields.get(i);
mv.visitLabel(labels[i]);
mv.visitFrame(F_SAME, 0, null, 0, null);
mv.visitVarInsn(ALOAD, 1);
mv.visitTypeInsn(CHECKCAST, classNameInternal);
mv.visitVarInsn(loadValueInstruction, 3);
mv.visitFieldInsn(PUTFIELD, field.getDeclaringClass().getName().replace('.', '/'), field.getName(),
typeNameInternal);
mv.visitInsn(RETURN);
}
}
// Rest of fields: different type
if (hasAnyBadTypeLabel) {
mv.visitLabel(labelForInvalidTypes);
mv.visitFrame(F_SAME, 0, null, 0, null);
insertThrowExceptionForFieldType(mv, primitiveType.getClassName());
}
// Default: field not found
mv.visitLabel(defaultLabel);
mv.visitFrame(F_SAME, 0, null, 0, null);
}
mv = insertThrowExceptionForFieldNotFound(mv);
mv.visitMaxs(maxStack, maxLocals);
mv.visitEnd();
}
Example 19
| Source File: CommonHelpers.java From HttpSessionReplacer with MIT License | 4 votes |
|
static void addLogError(ClassVisitor cw) {
MethodVisitor mv;
mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC + ACC_VARARGS, "$$error", "(Ljava/lang/String;[Ljava/lang/Object;)V",
null, null);
mv.visitCode();
Label l0 = new Label();
mv.visitLabel(l0);
mv.visitLineNumber(433, l0);
mv.visitFieldInsn(GETSTATIC, "java/lang/System", "err", "Ljava/io/PrintStream;");
mv.visitLdcInsn("SessionAgent: [ERROR] %s");
mv.visitInsn(ICONST_1);
mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
mv.visitInsn(DUP);
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKESTATIC, "java/lang/String", "format",
"(Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/String;", false);
mv.visitInsn(AASTORE);
mv.visitMethodInsn(INVOKESTATIC, "java/lang/String", "format",
"(Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/String;", false);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V", false);
Label l1 = new Label();
mv.visitLabel(l1);
mv.visitLineNumber(434, l1);
mv.visitVarInsn(ALOAD, 1);
Label l2 = new Label();
mv.visitJumpInsn(IFNULL, l2);
mv.visitVarInsn(ALOAD, 1);
mv.visitInsn(ARRAYLENGTH);
mv.visitInsn(ICONST_1);
mv.visitJumpInsn(IF_ICMPLE, l2);
mv.visitVarInsn(ALOAD, 1);
mv.visitVarInsn(ALOAD, 1);
mv.visitInsn(ARRAYLENGTH);
mv.visitInsn(ICONST_1);
mv.visitInsn(ISUB);
mv.visitInsn(AALOAD);
mv.visitTypeInsn(INSTANCEOF, "java/lang/Throwable");
mv.visitJumpInsn(IFEQ, l2);
Label l3 = new Label();
mv.visitLabel(l3);
mv.visitLineNumber(435, l3);
mv.visitVarInsn(ALOAD, 1);
mv.visitVarInsn(ALOAD, 1);
mv.visitInsn(ARRAYLENGTH);
mv.visitInsn(ICONST_1);
mv.visitInsn(ISUB);
mv.visitInsn(AALOAD);
mv.visitTypeInsn(CHECKCAST, "java/lang/Throwable");
mv.visitFieldInsn(GETSTATIC, "java/lang/System", "err", "Ljava/io/PrintStream;");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Throwable", "printStackTrace", "(Ljava/io/PrintStream;)V", false);
mv.visitLabel(l2);
mv.visitLineNumber(437, l2);
mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
mv.visitInsn(RETURN);
Label l4 = new Label();
mv.visitLabel(l4);
mv.visitLocalVariable("format", "Ljava/lang/String;", null, l0, l4, 0);
mv.visitLocalVariable("args", "[Ljava/lang/Object;", null, l0, l4, 1);
mv.visitMaxs(7, 2);
mv.visitEnd();
}
Example 20
| Source File: AsmBackedEmptyScriptGenerator.java From pushfish-android with BSD 2-Clause "Simplified" License | 4 votes |
|
private <T extends Script> Class<? extends T> generateEmptyScriptClass(Class<T> type) {
ClassWriter visitor = new ClassWriter(ClassWriter.COMPUTE_MAXS);
String typeName = type.getName() + "_Decorated";
Type generatedType = Type.getType("L" + typeName.replaceAll("\\.", "/") + ";");
Type superclassType = Type.getType(type);
visitor.visit(Opcodes.V1_5, Opcodes.ACC_PUBLIC, generatedType.getInternalName(), null,
superclassType.getInternalName(), new String[0]);
// Constructor
String constructorDescriptor = Type.getMethodDescriptor(Type.VOID_TYPE, new Type[0]);
MethodVisitor methodVisitor = visitor.visitMethod(Opcodes.ACC_PUBLIC, "<init>", constructorDescriptor, null,
new String[0]);
methodVisitor.visitCode();
// super()
methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, superclassType.getInternalName(), "<init>",
constructorDescriptor);
methodVisitor.visitInsn(Opcodes.RETURN);
methodVisitor.visitMaxs(0, 0);
methodVisitor.visitEnd();
// run() method
String runDesciptor = Type.getMethodDescriptor(Type.getType(Object.class), new Type[0]);
methodVisitor = visitor.visitMethod(Opcodes.ACC_PUBLIC, "run", runDesciptor, null, new String[0]);
methodVisitor.visitCode();
// return null
methodVisitor.visitInsn(Opcodes.ACONST_NULL);
methodVisitor.visitInsn(Opcodes.ARETURN);
methodVisitor.visitMaxs(0, 0);
methodVisitor.visitEnd();
visitor.visitEnd();
byte[] bytecode = visitor.toByteArray();
JavaMethod<ClassLoader, Class> method = JavaReflectionUtil.method(ClassLoader.class, Class.class, "defineClass", String.class, byte[].class, int.class, int.class);
@SuppressWarnings("unchecked")
Class<T> clazz = method.invoke(type.getClassLoader(), typeName, bytecode, 0, bytecode.length);
return clazz;
}
