org.springsource.loaded.SystemClassReflectionRewriter Maven / Gradle / Ivy
/*
* Copyright 2010-2014 Pivotal Software, Inc. and contributors
*
* 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.springsource.loaded;
import java.lang.reflect.Method;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* This is a special rewriter that should be used on system classes that are using reflection. These classes are loader above the
* agent code and so cannot use the agent code directly (they can't see the classes). In these situations we will do some rewriting
* that will only use other system types. How can that work? Well the affected types are modified to expose a static field (per
* reflective API used), these static fields are set by springloaded during later startup and then are available for access from the
* rewritten system class code.
*
* There is a null check in the injected method for cases where everything runs even sooner than can be plugged by SpringLoaded.
*
* The following are implemented so far:
*
*
* Due to ReflectionNavigator:
*
* - getDeclaredFields
*
- getDeclaredField
*
- getField
*
- getModifiers
*
- getDeclaredConstructor
*
- getDeclaredMethods
*
- getDeclaredMethod
*
*
* Due to ProxyGenerator
*
* - getMethods
*
* Due to ObjectStream (added in SL 1.2.0)
*
* - Class.getDeclaredConstructors
*
- Field.get
*
- Field.getLong
*
- Method.invoke
*
* The method hasStaticInitializer(Class) in ObjectStream needs special handling.
*
*
* This class modifies the calls to the reflective APIs, adds the fields and helper methods. The wiring of the SpringLoaded
* reflectiveinterceptor into types affected by this rewriter is currently done in SpringLoadedPreProcessor.
*
* @author Andy Clement
* @since 0.7.3
*/
public class SystemClassReflectionRewriter {
private static Logger log = Logger.getLogger(SystemClassReflectionRewriter.class.getName());
public static RewriteResult rewrite(String slashedClassName, byte[] bytes) {
if (GlobalConfiguration.isRuntimeLogging && log.isLoggable(Level.INFO)) {
log.info("SystemClassReflectionRewriter running for " + slashedClassName);
}
ClassReader fileReader = new ClassReader(bytes);
boolean is_jlObjectStream = slashedClassName.equals("java/io/ObjectStreamClass");
RewriteClassAdaptor classAdaptor = new RewriteClassAdaptor(is_jlObjectStream);
// TODO always skip frames? or just for javassist things?
fileReader.accept(classAdaptor, ClassReader.SKIP_FRAMES);
return new RewriteResult(classAdaptor.getBytes(), classAdaptor.getBits());
}
public static class RewriteResult implements Constants {
public final byte[] bytes;
// These bits describe which kinds of reflective things were done in the
// type - and so which fields (of the __sl variety) need filling in. For example,
// if the JLC_GETDECLAREDFIELDS bit is set, the field __sljlcgdfs must be set
public final int bits;
public RewriteResult(byte[] bytes, int bits) {
this.bytes = bytes;
this.bits = bits;
}
public String summarize() {
StringBuilder s = new StringBuilder();
s.append((bits & JLC_GETDECLAREDCONSTRUCTORS) != 0 ? "Class.getDeclaredConstructors()":"");
s.append((bits & JLC_GETDECLAREDCONSTRUCTOR) != 0 ? "Class.getDeclaredConstructor()" : "");
s.append((bits & JLC_GETCONSTRUCTOR) != 0 ? "Class.getConstructor()" : "");
s.append((bits & JLC_GETMODIFIERS) != 0 ? "Class.getModifiers()" : "");
s.append((bits & JLC_GETDECLAREDFIELDS) != 0 ? "Class.getDeclaredFields() " : "");
s.append((bits & JLC_GETDECLAREDFIELD) != 0 ? "Class.getDeclaredField() " : "");
s.append((bits & JLC_GETFIELD) != 0 ? "Class.getField() " : "");
s.append((bits & JLC_GETDECLAREDMETHODS) != 0 ? "Class.getDeclaredMethods() " : "");
s.append((bits & JLC_GETDECLAREDMETHOD) != 0 ? "Class.getDeclaredMethod() " : "");
s.append((bits & JLC_GETMETHOD) != 0 ? "Class.getMethod() " : "");
s.append((bits & JLC_GETMETHODS) != 0 ? "Class.getMethods() " : "");
s.append((bits & JLRM_INVOKE) != 0 ? "Method.invoke() " : "");
s.append((bits & JLRF_GET) != 0 ? "Field.get() " : "");
s.append((bits & JLRF_GETLONG) != 0 ? "Field.getLong() " : "");
s.append((bits & JLOS_HASSTATICINITIALIZER) != 0 ? "jlObjectStream.hasStaticInitializer() " : "");
return s.toString().trim();
}
}
static class RewriteClassAdaptor extends ClassVisitor implements Constants {
private ClassWriter cw;
int bits = 0x0000;
private String classname;
private boolean is_jlObjectStream;
// enum SpecialRewrite { NotSpecial, java_io_ObjectStreamClass_2 };
// private SpecialRewrite special = SpecialRewrite.NotSpecial;
// TODO [perf] lookup like this really the fastest way?
private static boolean isInterceptable(String owner, String methodName) {
String s = new StringBuilder(owner).append(".").append(methodName).toString();
return MethodInvokerRewriter.RewriteClassAdaptor.intercepted.contains(s);
}
public RewriteClassAdaptor(boolean is_jlObjectStream) {
super(ASM5,new ClassWriter(ClassWriter.COMPUTE_MAXS));
cw = (ClassWriter) cv;
this.is_jlObjectStream = is_jlObjectStream;
if (this.is_jlObjectStream) {
bits |= JLOS_HASSTATICINITIALIZER;
}
}
public byte[] getBytes() {
byte[] bytes = cw.toByteArray();
return bytes;
}
public int getBits() {
return bits;
}
@Override
public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
super.visit(version, access, name, signature, superName, interfaces);
this.classname = name;
// if (classname.equals("java/io/ObjectStreamClass$2")) {
// special = SpecialRewrite.java_io_ObjectStreamClass_2;
// }
}
static Method m = null;
@Override
public MethodVisitor visitMethod(int flags, String name, String descriptor, String signature, String[] exceptions) {
// if (is_jlObjectStream) {
// // TODO [serialization] clear those caches in the JVMPlugin
// // TODO [serialization] deal with FieldReflectors and changing formats? Maybe leave that for now and assume all the real fields are 'first'?
// // TODO [serialization] because not all classes to be serialized are reloadable ones, we'll need to change what we do here, generate the existing native method but an additional one that can delegate to it or call our SL layer
// if (name.equals("hasStaticInitializer")) {
// bits |= JLOS_HASSTATICINITIALIZER;
// SystemClassReflectionGenerator.generateJLObjectStream_hasStaticInitializer(cw, classname);
// return null;
// }
// }
MethodVisitor mv = super.visitMethod(flags, name, descriptor, signature, exceptions);
return new RewritingMethodAdapter(mv);
}
@Override
public void visitEnd() {
addExtraMethodsAndFields();
super.visitEnd();
}
private void addExtraMethodsAndFields() {
if ((bits & JLC_GETDECLAREDFIELDS) != 0) {
SystemClassReflectionGenerator.generateJLCGDFS(cw, classname);
}
if ((bits & JLC_GETDECLAREDFIELD) != 0) {
SystemClassReflectionGenerator.generateJLC(cw, classname, "getDeclaredField");
}
if ((bits & JLC_GETFIELD) != 0) {
SystemClassReflectionGenerator.generateJLC(cw, classname, "getField");
}
if ((bits & JLC_GETDECLAREDMETHODS) != 0) {
SystemClassReflectionGenerator.generateJLCGetXXXMethods(cw, classname, "getDeclaredMethods");
}
if ((bits & JLC_GETDECLAREDMETHOD) != 0) {
SystemClassReflectionGenerator.generateJLCMethod(cw, classname, "getDeclaredMethod");
}
if ((bits & JLC_GETMETHOD) != 0) {
SystemClassReflectionGenerator.generateJLCMethod(cw, classname, "getMethod");
}
if ((bits & JLC_GETMODIFIERS) != 0) {
SystemClassReflectionGenerator.generateJLCGMODS(cw, classname);
}
if ((bits & JLC_GETDECLAREDCONSTRUCTOR) != 0) {
SystemClassReflectionGenerator.generateJLCGDC(cw, classname);
}
if ((bits & JLC_GETDECLAREDCONSTRUCTORS) != 0) {
SystemClassReflectionGenerator.generateJLC_GetDeclaredConstructors(cw, classname);
}
if ((bits & JLC_GETMETHODS) != 0) {
SystemClassReflectionGenerator.generateJLCGetXXXMethods(cw, classname, "getMethods");
}
if ((bits & JLC_GETCONSTRUCTOR) != 0) {
SystemClassReflectionGenerator.generateJLCGC(cw, classname);
}
if ((bits & JLRM_INVOKE) != 0) {
SystemClassReflectionGenerator.generateJLRM_Invoke(cw, classname);
}
if ((bits & JLRF_GET) != 0) {
SystemClassReflectionGenerator.generateJLRF_Get(cw, classname);
}
if ((bits & JLRF_GETLONG) != 0) {
SystemClassReflectionGenerator.generateJLRF_GetLong(cw, classname);
}
if (this.is_jlObjectStream) {
SystemClassReflectionGenerator.generateJLObjectStream_hasStaticInitializer(cw, classname);
}
}
class RewritingMethodAdapter extends MethodVisitor implements Opcodes, Constants {
public RewritingMethodAdapter(MethodVisitor mv) {
super(ASM5,mv);
}
/**
* The big method for intercepting reflection. It is passed what the original code is trying to do (which method it is
* calling) and decides:
*
* - whether to rewrite it
*
- what method should be called instead
*
*
* @return true if the call was modified/intercepted
*/
private boolean interceptReflection(String owner, String name, String desc) {
if (isInterceptable(owner, name)) {
return callReflectiveInterceptor(owner, name, desc, mv);
}
return false;
}
int unitializedObjectsCount = 0;
@Override
public void visitTypeInsn(final int opcode, final String type) {
if (opcode == NEW) {
unitializedObjectsCount++;
}
super.visitTypeInsn(opcode, type);
}
@Override
public void visitMethodInsn(final int opcode, final String owner, final String name, final String desc, final boolean itf) {
if (!GlobalConfiguration.interceptReflection || rewriteReflectiveCall(opcode, owner, name, desc)) {
return;
}
if (opcode == INVOKESPECIAL) {
unitializedObjectsCount--;
}
// if (special!=SpecialRewrite.NotSpecial) {
// // Special cases:
// if (special==SpecialRewrite.java_io_ObjectStreamClass_2) {
// // The class java.io.ObjectStreamClass is loaded too early for us to modify and yet it uses reflection.
// // That means we need to modify calls to that class instead.
//
// // The anonymous inner type $2 makes a call to
// // 66: invokestatic #10; //Method java/io/ObjectStreamClass.access$700:(Ljava/lang/Class;)Ljava/lang/Long;
// // which is the accessor method for the private method 'Long getDeclaredSUID()' in ObjectStreamClass. Redirect this
// // method to a helper that can retrieve the suid and be rewritten.
// // TODO skip descriptor check, surely name is enough?
//// if (owner.equals("java/io/ObjectStreamClass") && name.equals("access$700") && desc.equals("(Ljava/lang/Class;)Ljava/lang/Long;")) {
//// // 1. retrieve the serialVersionUID field
//// mv.visitLdcInsn("serialVersionUID");
//// bits|=JLC_GETDECLAREDFIELD;
//// mv.visitMethodInsn(INVOKESTATIC,classname, jlcgdf, jlcgdfDescriptor);
////
////
//// }
////// private static Long getDeclaredSUID(Class cl) {
////// try {
////// Field f = cl.getDeclaredField("serialVersionUID");
////// int mask = Modifier.STATIC | Modifier.FINAL;
////// if ((f.getModifiers() & mask) == mask) {
////// f.setAccessible(true);
////// return Long.valueOf(f.getLong(null));
////// }
////// } catch (Exception ex) {
////// }
////// return null;
////// }
// }
// }
super.visitMethodInsn(opcode, owner, name, desc, itf);
}
/**
* Determine if a method call is a reflective call and an attempt should be made to rewrite it.
*
* @return true if the call was rewritten
*/
private boolean rewriteReflectiveCall(int opcode, String owner, String name, String desc) {
if (owner.length() > 10 && owner.charAt(8) == 'g'
&& (owner.startsWith("java/lang/reflect/") || owner.equals("java/lang/Class"))) {
boolean rewritten = interceptReflection(owner, name, desc);
if (rewritten) {
return true;
}
}
else if (is_jlObjectStream && owner.equals(classname) && name.equals("hasStaticInitializer")) {
// Call our interception method generated into this type
mv.visitMethodInsn(INVOKESTATIC,classname,jloObjectStream_hasInitializerMethod,desc);
return true;
}
return false;
}
private boolean callReflectiveInterceptor(String owner, String name, String desc, MethodVisitor mv) {
if (owner.equals("java/lang/Class")) {
if (name.equals("getDeclaredFields")) {
// stack on arrival:
bits |= JLC_GETDECLAREDFIELDS;
mv.visitMethodInsn(INVOKESTATIC, classname, jlcgdfs, jlcgdfsDescriptor, false);
return true;
} else if (name.equals("getDeclaredField")) {
// stack on arrival:
bits |= JLC_GETDECLAREDFIELD;
mv.visitMethodInsn(INVOKESTATIC, classname, jlcgdf, jlcgdfDescriptor, false);
return true;
} else if (name.equals("getField")) {
// stack on arrival:
bits |= JLC_GETFIELD;
mv.visitMethodInsn(INVOKESTATIC, classname, jlcgf, jlcgfDescriptor, false);
return true;
} else if (name.equals("getDeclaredMethods")) {
// stack on arrival:
bits |= JLC_GETDECLAREDMETHODS;
mv.visitMethodInsn(INVOKESTATIC, classname, jlcgdms, jlcgdmsDescriptor, false);
return true;
} else if (name.equals("getDeclaredMethod")) {
// stack on arrival:
bits |= JLC_GETDECLAREDMETHOD;
mv.visitMethodInsn(INVOKESTATIC, classname, jlcgdm, jlcgdmDescriptor, false);
return true;
} else if (name.equals("getMethod")) {
// stack on arrival:
bits |= JLC_GETMETHOD;
mv.visitMethodInsn(INVOKESTATIC, classname, jlcgm, jlcgmDescriptor, false);
return true;
} else if (name.equals("getDeclaredConstructor")) {
// stack on arrival:
bits |= JLC_GETDECLAREDCONSTRUCTOR;
mv.visitMethodInsn(INVOKESTATIC, classname, jlcgdc, jlcgdcDescriptor, false);
return true;
} else if (name.equals("getDeclaredConstructors")) {
// stack on arrival:
bits |= JLC_GETDECLAREDCONSTRUCTORS;
mv.visitMethodInsn(INVOKESTATIC, classname, jlcGetDeclaredConstructorsMember,jlcGetDeclaredConstructorsDescriptor, false);
return true;
} else if (name.equals("getConstructor")) {
// stack on arrival:
bits |= JLC_GETCONSTRUCTOR;
mv.visitMethodInsn(INVOKESTATIC, classname, jlcgc, jlcgcDescriptor, false);
return true;
} else if (name.equals("getModifiers")) {
// stack on arrival:
bits |= JLC_GETMODIFIERS;
mv.visitMethodInsn(INVOKESTATIC, classname, jlcgmods, jlcgmodsDescriptor, false);
return true;
} else if (name.equals("getMethods")) {
// stack on arrival:
bits |= JLC_GETMETHODS;
mv.visitMethodInsn(INVOKESTATIC, classname, jlcgms, jlcgmsDescriptor, false);
return true;
} else if (name.equals("newInstance")) {
// TODO determine if this actually needs rewriting? Just catching in this if clause to avoid the message
return false;
}
} else if (owner.equals("java/lang/reflect/Constructor")) {
if (name.equals("newInstance")) {
// catching to avoid message
// seen: in Proxy Constructor.newInstance() is used on the newly created proxy class - we don't need to intercept that
return false;
}
} else if (owner.equals("java/lang/reflect/Method")) {
if (name.equals("invoke")) {
bits |= JLRM_INVOKE;
// stack on arrival:
mv.visitMethodInsn(INVOKESTATIC, classname, jlrmInvokeMember, jlrmInvokeDescriptor);
return true;
}
} else if (owner.equals("java/lang/reflect/Field")) {
if (name.equals("get")) {
bits |= JLRF_GET;
// stack on arrival:
mv.visitMethodInsn(INVOKESTATIC, classname, jlrfGetMember, jlrfGetDescriptor);
return true;
} else if (name.equals("getLong")) {
bits |= JLRF_GETLONG;
// stack on arrival:
mv.visitMethodInsn(INVOKESTATIC, classname, jlrfGetLongMember, jlrfGetLongDescriptor);
return true;
}
}
System.err.println("!!! SystemClassReflectionRewriter: nyi for " + owner + "." + name);
return false;
}
}
}
}
/**
* This helper class will generate the fields/methods in the system classes that are being rewritten.
*/
class SystemClassReflectionGenerator implements Constants {
// public static Method __sljlcgdfs;
// @SuppressWarnings("unused")
// private static Field[] __sljlcgdfs(Class clazz) {
// if (__sljlcgdfs == null) {
// return clazz.getDeclaredFields();
// }
// try {
// return (Field[]) __sljlcgdfs.invoke(null, clazz);
// } catch (Exception e) {
// return null;
// }
// }
// public static Method __sljlcgdms;
// @SuppressWarnings("unused")
// private static Method[] __sljlcgdms(Class clazz) {
// if (__sljlcgdms == null) {
// return clazz.getDeclaredMethods();
// }
// try {
// return (Method[]) __sljlcgdms.invoke(null, clazz);
// } catch (Exception e) {
// return null;
// }
// }
// public static Method __sljlcgdf;
// @SuppressWarnings("unused")
// private static Field __sljlcgdf(Class clazz, String fieldname) throws NoSuchFieldException {
// if (__sljlcgdf == null) {
// return clazz.getDeclaredField(fieldname);
// }
// try {
// return (Field) __sljlcgdf.invoke(null, clazz, fieldname);
// } catch (InvocationTargetException ite) {
// if (ite.getCause() instanceof NoSuchFieldException) {
// throw (NoSuchFieldException) ite.getCause();
// }
// } catch (Exception e) {
// }
// return null;
// }
// public static Method __sljlcgdm;
//
// @SuppressWarnings("unused")
// private static Method __sljlcgdm(Class clazz, String methodname, Class... parameterTypes) throws NoSuchMethodException {
// if (__sljlcgdm == null) {
// return clazz.getDeclaredMethod(methodname, parameterTypes);
// }
// try {
// // if (parameterTypes == null) {
// return (Method) __sljlcgdm.invoke(null, clazz, methodname, parameterTypes);
// // } else {
// // Object[] params = new Object[2 + parameterTypes.length];
// // System.arraycopy(parameterTypes, 0, params, 2, parameterTypes.length);
// // params[0] = clazz;
// // params[1] = methodname;
// // return (Method) __sljlcgdm.invoke(null, clazz, methodname, parameterTypes);
// // }
// } catch (InvocationTargetException ite) {
// ite.printStackTrace();
// if (ite.getCause() instanceof NoSuchMethodException) {
// throw (NoSuchMethodException) ite.getCause();
// }
// } catch (Exception e) {
// e.printStackTrace();
// }
// return null;
// }
// public static Method __sljlcgdc;
//
// @SuppressWarnings("unused")
// private static Constructor __sljlcgdc(Class clazz, Class... parameterTypes) throws NoSuchMethodException {
// if (__sljlcgdc == null) {
// return clazz.getDeclaredConstructor(parameterTypes);
// }
// try {
// return (Constructor) __sljlcgdc.invoke(null, clazz, parameterTypes);
// } catch (InvocationTargetException ite) {
// ite.printStackTrace();
// if (ite.getCause() instanceof NoSuchMethodException) {
// throw (NoSuchMethodException) ite.getCause();
// }
// } catch (Exception e) {
// e.printStackTrace();
// }
// return null;
// }
// public static Method __sljlcgmods;
//
// @SuppressWarnings("unused")
// private static int __sljlcgmods(Class clazz) {
// if (__sljlcgmods == null) {
// return clazz.getModifiers();
// }
// try {
// return (Integer) __sljlcgmods.invoke(null, clazz);
// } catch (Exception e) {
// e.printStackTrace();
// return 0;
// }
// }
// public static Method __sljlcgdcs;
// private static Constructor[] __sljlcgdcs(Class clazz) {
// if (__sljlcgdcs == null) {
// return clazz.getDeclaredConstructors();
// }
// try {
// return (Constructor[])__sljlcgdcs.invoke(null,clazz);
// } catch (Exception e) {
// return null;
// }
// }
// public static Method __sljlrmi;
// private static Object __sljlrmi(Method method, Object instance, Object[] args) throws InvocationTargetException, IllegalAccessException {
// if (__sljlrmi == null) {
// return method.invoke(instance,args);
// }
// try {
// return __sljlrmi.invoke(null, method, instance, args);
// } catch (Exception e) {
// return null;
// }
// }
// public static Method __sljlrfg;
// private static Object __sljlrfg(Field field, Object instance) throws IllegalArgumentException, IllegalAccessException {
// if (__sljlrfg == null) {
// return field.get(instance);
// }
// try {
// return __sljlrfg.invoke(null, field,instance);
// } catch (Exception e) {
// return null;
// }
// }
// public static Method __sljlrfgl;
// private static long __sljlrfgl(Field field, Object instance) throws IllegalArgumentException, IllegalAccessException {
// if (__sljlrfgl == null) {
// return field.getLong(instance);
// }
// try {
// return (Long)__sljlrfgl.invoke(null, field, instance);
// } catch (Exception e) {
// return 0;
// }
// }
public static void generateJLRF_GetLong(ClassWriter cw, String classname) {
FieldVisitor fv = cw.visitField(ACC_PUBLIC + ACC_STATIC, jlrfGetLongMember, "Ljava/lang/reflect/Method;", null, null);
fv.visitEnd();
MethodVisitor mv = cw.visitMethod(ACC_PRIVATE + ACC_STATIC, jlrfGetLongMember, jlrfGetLongDescriptor,
null, new String[]{"java/lang/IllegalAccessException","java/lang/IllegalArgumentException"});
mv.visitCode();
Label l0 = new Label();
Label l1 = new Label();
Label l2 = new Label();
mv.visitTryCatchBlock(l0, l1, l2, "java/lang/Exception");
Label l3 = new Label();
mv.visitLabel(l3);
mv.visitFieldInsn(GETSTATIC, classname, jlrfGetLongMember, "Ljava/lang/reflect/Method;");
mv.visitJumpInsn(IFNONNULL, l0);
Label l4 = new Label();
mv.visitLabel(l4);
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Field", "getLong", "(Ljava/lang/Object;)J");
mv.visitInsn(LRETURN);
mv.visitLabel(l0);
mv.visitFieldInsn(GETSTATIC, classname, jlrfGetLongMember, "Ljava/lang/reflect/Method;");
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ICONST_2);
mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
mv.visitInsn(DUP);
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ALOAD, 0); // target field
mv.visitInsn(AASTORE);
mv.visitInsn(DUP);
mv.visitInsn(ICONST_1);
mv.visitVarInsn(ALOAD, 1); // instance on which to get the field
mv.visitInsn(AASTORE);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "invoke",
"(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;");
mv.visitLabel(l1);
mv.visitTypeInsn(CHECKCAST, "java/lang/Long");
mv.visitMethodInsn(INVOKEVIRTUAL,"java/lang/Long","longValue","()J");
mv.visitInsn(LRETURN);
mv.visitLabel(l2);
mv.visitVarInsn(ASTORE, 2);
Label l5 = new Label();
mv.visitLabel(l5);
Label l6 = new Label();
mv.visitLabel(l6);
mv.visitLdcInsn(0L);
mv.visitInsn(LRETURN);
Label l7 = new Label();
mv.visitLabel(l7);
mv.visitMaxs(8, 4);
mv.visitEnd();
}
/**
* Create a method that can be used to intercept the calls to hasStaticInitializer made in the ObjectStreamClass.
* The method will ask SpringLoaded whether the type has a static initializer. SpringLoaded will be able to answer
* if it is a reloadable type. If it is not a reloadable type then springloaded will throw an exception which will
* be caught here and the 'regular' call to hasStaticInitializer will be made.
*
* @param cw the classwriter to create the method in
* @param classname the name of the class being visited
*/
public static void generateJLObjectStream_hasStaticInitializer(
ClassWriter cw, String classname) {
FieldVisitor fv = cw.visitField(ACC_PUBLIC + ACC_STATIC, jloObjectStream_hasInitializerMethod, "Ljava/lang/reflect/Method;", null, null);
fv.visitEnd();
MethodVisitor mv = cw.visitMethod(ACC_PRIVATE + ACC_STATIC, jloObjectStream_hasInitializerMethod, "(Ljava/lang/Class;)Z", null, null);
mv.visitCode();
Label l0 = new Label();
Label l1 = new Label();
Label l2 = new Label();
mv.visitTryCatchBlock(l0, l1, l2, "java/lang/Exception");
mv.visitLabel(l0);
mv.visitFieldInsn(GETSTATIC, classname, jloObjectStream_hasInitializerMethod, "Ljava/lang/reflect/Method;");
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ICONST_1);
mv.visitTypeInsn(ANEWARRAY,"java/lang/Object");
mv.visitInsn(DUP);
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ALOAD, 0);
mv.visitInsn(AASTORE);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "invoke",
"(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", false);
mv.visitTypeInsn(CHECKCAST, "java/lang/Boolean");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Boolean", "booleanValue", "()Z", false);
mv.visitLabel(l1);
mv.visitInsn(IRETURN);
mv.visitLabel(l2);
// If not a reloadable type, we'll end up here (the method we called threw IllegalStateException), just make that native method call
mv.visitVarInsn(ASTORE, 1);
mv.visitVarInsn(ALOAD,0);
mv.visitMethodInsn(INVOKESTATIC, classname, "hasStaticInitializer","(Ljava/lang/Class;)Z");
mv.visitInsn(IRETURN);
mv.visitMaxs(3, 1);
mv.visitEnd();
}
public static void generateJLRF_Get(ClassWriter cw, String classname) {
FieldVisitor fv = cw.visitField(ACC_PUBLIC + ACC_STATIC, jlrfGetMember, "Ljava/lang/reflect/Method;", null, null);
fv.visitEnd();
MethodVisitor mv = cw.visitMethod(ACC_PRIVATE + ACC_STATIC, jlrfGetMember, jlrfGetDescriptor,
null, new String[]{"java/lang/IllegalAccessException","java/lang/IllegalArgumentException"});
mv.visitCode();
Label l0 = new Label();
Label l1 = new Label();
Label l2 = new Label();
mv.visitTryCatchBlock(l0, l1, l2, "java/lang/Exception");
Label l3 = new Label();
mv.visitLabel(l3);
mv.visitFieldInsn(GETSTATIC, classname, jlrfGetMember, "Ljava/lang/reflect/Method;");
mv.visitJumpInsn(IFNONNULL, l0);
Label l4 = new Label();
mv.visitLabel(l4);
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Field", "get", "(Ljava/lang/Object;)Ljava/lang/Object;", false);
mv.visitInsn(ARETURN);
mv.visitLabel(l0);
mv.visitFieldInsn(GETSTATIC, classname, jlrfGetMember, "Ljava/lang/reflect/Method;");
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ICONST_2);
mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
mv.visitInsn(DUP);
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ALOAD, 0); // target field
mv.visitInsn(AASTORE);
mv.visitInsn(DUP);
mv.visitInsn(ICONST_1);
mv.visitVarInsn(ALOAD, 1); // instance on which to get the field
mv.visitInsn(AASTORE);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "invoke",
"(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", false);
mv.visitLabel(l1);
mv.visitInsn(ARETURN);
mv.visitLabel(l2);
mv.visitVarInsn(ASTORE, 2);
Label l5 = new Label();
mv.visitLabel(l5);
Label l6 = new Label();
mv.visitLabel(l6);
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ARETURN);
Label l7 = new Label();
mv.visitLabel(l7);
mv.visitMaxs(8, 4);
mv.visitEnd();
}
public static void generateJLRM_Invoke(ClassWriter cw, String classname) {
FieldVisitor fv = cw.visitField(ACC_PUBLIC + ACC_STATIC, jlrmInvokeMember, "Ljava/lang/reflect/Method;", null, null);
fv.visitEnd();
MethodVisitor mv = cw.visitMethod(ACC_PRIVATE + ACC_STATIC, jlrmInvokeMember, jlrmInvokeDescriptor,
null, new String[]{"java/lang/IllegalAccessException","java/lang/reflect/InvocationTargetException"});
mv.visitCode();
Label l0 = new Label();
Label l1 = new Label();
Label l2 = new Label();
mv.visitTryCatchBlock(l0, l1, l2, "java/lang/Exception");
Label l3 = new Label();
mv.visitLabel(l3);
mv.visitFieldInsn(GETSTATIC, classname, jlrmInvokeMember, "Ljava/lang/reflect/Method;");
mv.visitJumpInsn(IFNONNULL, l0);
Label l4 = new Label();
mv.visitLabel(l4);
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitVarInsn(ALOAD, 2);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "invoke", "(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", false);
mv.visitInsn(ARETURN);
mv.visitLabel(l0);
mv.visitFieldInsn(GETSTATIC, classname, jlrmInvokeMember, "Ljava/lang/reflect/Method;");
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ICONST_3);
mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
mv.visitInsn(DUP);
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ALOAD, 0); // target method
mv.visitInsn(AASTORE);
mv.visitInsn(DUP);
mv.visitInsn(ICONST_1);
mv.visitVarInsn(ALOAD, 1); // instance on which to call the method
mv.visitInsn(AASTORE);
mv.visitInsn(DUP);
mv.visitInsn(ICONST_2);
mv.visitVarInsn(ALOAD, 2); // arguments to method call
mv.visitInsn(AASTORE);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "invoke",
"(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", false);
mv.visitLabel(l1);
mv.visitInsn(ARETURN);
mv.visitLabel(l2);
mv.visitVarInsn(ASTORE, 3);
Label l5 = new Label();
mv.visitLabel(l5);
Label l6 = new Label();
mv.visitLabel(l6);
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ARETURN);
Label l7 = new Label();
mv.visitLabel(l7);
mv.visitMaxs(8, 4);
mv.visitEnd();
}
public static void generateJLC_GetDeclaredConstructors(ClassWriter cw, String classname) {
FieldVisitor fv = cw.visitField(ACC_PUBLIC + ACC_STATIC, jlcGetDeclaredConstructorsMember, "Ljava/lang/reflect/Method;", null, null);
fv.visitEnd();
MethodVisitor mv = cw.visitMethod(ACC_PRIVATE + ACC_STATIC, jlcGetDeclaredConstructorsMember, jlcGetDeclaredConstructorsDescriptor,
null, null);
mv.visitCode();
Label l0 = new Label();
Label l1 = new Label();
Label l2 = new Label();
mv.visitTryCatchBlock(l0, l1, l2, "java/lang/Exception");
Label l3 = new Label();
mv.visitLabel(l3);
mv.visitFieldInsn(GETSTATIC, classname, jlcGetDeclaredConstructorsMember, "Ljava/lang/reflect/Method;");
mv.visitJumpInsn(IFNONNULL, l0);
Label l4 = new Label();
mv.visitLabel(l4);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", "getDeclaredConstructors", "()[Ljava/lang/reflect/Constructor;", false);
mv.visitInsn(ARETURN);
mv.visitLabel(l0);
mv.visitFieldInsn(GETSTATIC, classname, jlcGetDeclaredConstructorsMember, "Ljava/lang/reflect/Method;");
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ICONST_1);
mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
mv.visitInsn(DUP);
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ALOAD, 0);
mv.visitInsn(AASTORE);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "invoke",
"(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", false);
mv.visitTypeInsn(CHECKCAST, "[Ljava/lang/reflect/Constructor;");
mv.visitLabel(l1);
mv.visitInsn(ARETURN);
mv.visitLabel(l2);
mv.visitVarInsn(ASTORE, 1);
Label l5 = new Label();
mv.visitLabel(l5);
Label l6 = new Label();
mv.visitLabel(l6);
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ARETURN);
Label l7 = new Label();
mv.visitLabel(l7);
// mv.visitLocalVariable("clazz", "Ljava/lang/Class;", "Ljava/lang/Class<*>;", l3, l7, 0);
// mv.visitLocalVariable("e", "Ljava/lang/Exception;", null, l5, l7, 1);
mv.visitMaxs(6, 2);
mv.visitEnd();
}
public static void generateJLCGMODS(ClassWriter cw, String classname) {
FieldVisitor fv = cw.visitField(ACC_PUBLIC + ACC_STATIC, "__sljlcgmods", "Ljava/lang/reflect/Method;", null, null);
fv.visitEnd();
MethodVisitor mv = cw.visitMethod(ACC_PRIVATE + ACC_STATIC, "__sljlcgmods", "(Ljava/lang/Class;)I",
"(Ljava/lang/Class<*>;)I", null);
mv.visitCode();
Label l0 = new Label();
Label l1 = new Label();
Label l2 = new Label();
mv.visitTryCatchBlock(l0, l1, l2, "java/lang/Exception");
Label l3 = new Label();
mv.visitLabel(l3);
mv.visitFieldInsn(GETSTATIC, classname, "__sljlcgmods", "Ljava/lang/reflect/Method;");
mv.visitJumpInsn(IFNONNULL, l0);
Label l4 = new Label();
mv.visitLabel(l4);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", "getModifiers", "()I", false);
mv.visitInsn(IRETURN);
mv.visitLabel(l0);
mv.visitFieldInsn(GETSTATIC, classname, "__sljlcgmods", "Ljava/lang/reflect/Method;");
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ICONST_1);
mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
mv.visitInsn(DUP);
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ALOAD, 0);
mv.visitInsn(AASTORE);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "invoke",
"(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", false);
mv.visitTypeInsn(CHECKCAST, "java/lang/Integer");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Integer", "intValue", "()I", false);
mv.visitLabel(l1);
mv.visitInsn(IRETURN);
mv.visitLabel(l2);
mv.visitVarInsn(ASTORE, 1);
Label l5 = new Label();
mv.visitLabel(l5);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Exception", "printStackTrace", "()V", false);
Label l6 = new Label();
mv.visitLabel(l6);
mv.visitInsn(ICONST_0);
mv.visitInsn(IRETURN);
Label l7 = new Label();
mv.visitLabel(l7);
// mv.visitLocalVariable("clazz", "Ljava/lang/Class;", "Ljava/lang/Class<*>;", l3, l7, 0);
// mv.visitLocalVariable("e", "Ljava/lang/Exception;", null, l5, l7, 1);
mv.visitMaxs(6, 2);
mv.visitEnd();
}
public static void generateJLCGDC(ClassWriter cw, String classname) {
FieldVisitor fv = cw.visitField(ACC_PUBLIC + ACC_STATIC, "__sljlcgdc", "Ljava/lang/reflect/Method;", null, null);
fv.visitEnd();
MethodVisitor mv = cw.visitMethod(ACC_PRIVATE + ACC_STATIC + ACC_VARARGS, "__sljlcgdc",
"(Ljava/lang/Class;[Ljava/lang/Class;)Ljava/lang/reflect/Constructor;", null,
new String[] { "java/lang/NoSuchMethodException" });
mv.visitCode();
Label l0 = new Label();
Label l1 = new Label();
Label l2 = new Label();
mv.visitTryCatchBlock(l0, l1, l2, "java/lang/reflect/InvocationTargetException");
Label l3 = new Label();
mv.visitTryCatchBlock(l0, l1, l3, "java/lang/Exception");
Label l4 = new Label();
mv.visitLabel(l4);
mv.visitFieldInsn(GETSTATIC, classname, "__sljlcgdc", "Ljava/lang/reflect/Method;");
mv.visitJumpInsn(IFNONNULL, l0);
Label l5 = new Label();
mv.visitLabel(l5);
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", "getDeclaredConstructor",
"([Ljava/lang/Class;)Ljava/lang/reflect/Constructor;", false);
mv.visitInsn(ARETURN);
mv.visitLabel(l0);
mv.visitFieldInsn(GETSTATIC, classname, "__sljlcgdc", "Ljava/lang/reflect/Method;");
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ICONST_2);
mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
mv.visitInsn(DUP);
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ALOAD, 0);
mv.visitInsn(AASTORE);
mv.visitInsn(DUP);
mv.visitInsn(ICONST_1);
mv.visitVarInsn(ALOAD, 1);
mv.visitInsn(AASTORE);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "invoke",
"(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", false);
mv.visitTypeInsn(CHECKCAST, "java/lang/reflect/Constructor");
mv.visitLabel(l1);
mv.visitInsn(ARETURN);
mv.visitLabel(l2);
mv.visitVarInsn(ASTORE, 2);
Label l6 = new Label();
mv.visitLabel(l6);
mv.visitVarInsn(ALOAD, 2);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "printStackTrace", "()V", false);
Label l7 = new Label();
mv.visitLabel(l7);
mv.visitVarInsn(ALOAD, 2);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "getCause", "()Ljava/lang/Throwable;", false);
mv.visitTypeInsn(INSTANCEOF, "java/lang/NoSuchMethodException");
Label l8 = new Label();
mv.visitJumpInsn(IFEQ, l8);
Label l9 = new Label();
mv.visitLabel(l9);
mv.visitVarInsn(ALOAD, 2);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "getCause", "()Ljava/lang/Throwable;", false);
mv.visitTypeInsn(CHECKCAST, "java/lang/NoSuchMethodException");
mv.visitInsn(ATHROW);
mv.visitLabel(l3);
mv.visitVarInsn(ASTORE, 2);
Label l10 = new Label();
mv.visitLabel(l10);
// mv.visitVarInsn(ALOAD, 2);
// mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Exception", "printStackTrace", "()V");
mv.visitLabel(l8);
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ARETURN);
Label l11 = new Label();
mv.visitLabel(l11);
// mv.visitLocalVariable("clazz", "Ljava/lang/Class;", "Ljava/lang/Class<*>;", l4, l11, 0);
// mv.visitLocalVariable("parameterTypes", "[Ljava/lang/Class;", null, l4, l11, 1);
// mv.visitLocalVariable("ite", "Ljava/lang/reflect/InvocationTargetException;", null, l6, l3, 2);
// mv.visitLocalVariable("e", "Ljava/lang/Exception;", null, l10, l8, 2);
mv.visitMaxs(6, 3);
mv.visitEnd();
}
public static void generateJLCGC(ClassWriter cw, String classname) {
FieldVisitor fv = cw.visitField(ACC_PUBLIC + ACC_STATIC, "__sljlcgc", "Ljava/lang/reflect/Method;", null, null);
fv.visitEnd();
MethodVisitor mv = cw.visitMethod(ACC_PRIVATE + ACC_STATIC + ACC_VARARGS, "__sljlcgc",
"(Ljava/lang/Class;[Ljava/lang/Class;)Ljava/lang/reflect/Constructor;", null,
new String[] { "java/lang/NoSuchMethodException" });
mv.visitCode();
Label l0 = new Label();
Label l1 = new Label();
Label l2 = new Label();
mv.visitTryCatchBlock(l0, l1, l2, "java/lang/reflect/InvocationTargetException");
Label l3 = new Label();
mv.visitTryCatchBlock(l0, l1, l3, "java/lang/Exception");
Label l4 = new Label();
mv.visitLabel(l4);
mv.visitFieldInsn(GETSTATIC, classname, "__sljlcgc", "Ljava/lang/reflect/Method;");
mv.visitJumpInsn(IFNONNULL, l0);
Label l5 = new Label();
mv.visitLabel(l5);
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", "getConstructor",
"([Ljava/lang/Class;)Ljava/lang/reflect/Constructor;", false);
mv.visitInsn(ARETURN);
mv.visitLabel(l0);
mv.visitFieldInsn(GETSTATIC, classname, "__sljlcgc", "Ljava/lang/reflect/Method;");
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ICONST_2);
mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
mv.visitInsn(DUP);
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ALOAD, 0);
mv.visitInsn(AASTORE);
mv.visitInsn(DUP);
mv.visitInsn(ICONST_1);
mv.visitVarInsn(ALOAD, 1);
mv.visitInsn(AASTORE);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "invoke",
"(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", false);
mv.visitTypeInsn(CHECKCAST, "java/lang/reflect/Constructor");
mv.visitLabel(l1);
mv.visitInsn(ARETURN);
mv.visitLabel(l2);
mv.visitVarInsn(ASTORE, 2);
Label l6 = new Label();
mv.visitLabel(l6);
mv.visitVarInsn(ALOAD, 2);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "printStackTrace", "()V", false);
Label l7 = new Label();
mv.visitLabel(l7);
mv.visitVarInsn(ALOAD, 2);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "getCause", "()Ljava/lang/Throwable;", false);
mv.visitTypeInsn(INSTANCEOF, "java/lang/NoSuchMethodException");
Label l8 = new Label();
mv.visitJumpInsn(IFEQ, l8);
Label l9 = new Label();
mv.visitLabel(l9);
mv.visitVarInsn(ALOAD, 2);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "getCause", "()Ljava/lang/Throwable;", false);
mv.visitTypeInsn(CHECKCAST, "java/lang/NoSuchMethodException");
mv.visitInsn(ATHROW);
mv.visitLabel(l3);
mv.visitVarInsn(ASTORE, 2);
Label l10 = new Label();
mv.visitLabel(l10);
// mv.visitVarInsn(ALOAD, 2);
// mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Exception", "printStackTrace", "()V");
mv.visitLabel(l8);
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ARETURN);
Label l11 = new Label();
mv.visitLabel(l11);
// mv.visitLocalVariable("clazz", "Ljava/lang/Class;", "Ljava/lang/Class<*>;", l4, l11, 0);
// mv.visitLocalVariable("parameterTypes", "[Ljava/lang/Class;", null, l4, l11, 1);
// mv.visitLocalVariable("ite", "Ljava/lang/reflect/InvocationTargetException;", null, l6, l3, 2);
// mv.visitLocalVariable("e", "Ljava/lang/Exception;", null, l10, l8, 2);
mv.visitMaxs(6, 3);
mv.visitEnd();
}
public static void generateJLCMethod(ClassWriter cw, String classname, String membername, String methodname) {
FieldVisitor fv = cw.visitField(ACC_PUBLIC + ACC_STATIC, membername, "Ljava/lang/reflect/Method;", null, null);
fv.visitEnd();
MethodVisitor mv = cw.visitMethod(ACC_PRIVATE + ACC_STATIC + ACC_VARARGS, membername,
"(Ljava/lang/Class;Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;", null,
new String[] { "java/lang/NoSuchMethodException" });
mv.visitCode();
Label l0 = new Label();
Label l1 = new Label();
Label l2 = new Label();
mv.visitTryCatchBlock(l0, l1, l2, "java/lang/reflect/InvocationTargetException");
Label l3 = new Label();
mv.visitTryCatchBlock(l0, l1, l3, "java/lang/Exception");
Label l4 = new Label();
mv.visitLabel(l4);
mv.visitFieldInsn(GETSTATIC, classname, membername, "Ljava/lang/reflect/Method;");
mv.visitJumpInsn(IFNONNULL, l0);
Label l5 = new Label();
mv.visitLabel(l5);
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitVarInsn(ALOAD, 2);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", methodname,
"(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;", false);
mv.visitInsn(ARETURN);
mv.visitLabel(l0);
mv.visitFieldInsn(GETSTATIC, classname, membername, "Ljava/lang/reflect/Method;");
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ICONST_3);
mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
mv.visitInsn(DUP);
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ALOAD, 0);
mv.visitInsn(AASTORE);
mv.visitInsn(DUP);
mv.visitInsn(ICONST_1);
mv.visitVarInsn(ALOAD, 1);
mv.visitInsn(AASTORE);
mv.visitInsn(DUP);
mv.visitInsn(ICONST_2);
mv.visitVarInsn(ALOAD, 2);
mv.visitInsn(AASTORE);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "invoke",
"(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", false);
mv.visitTypeInsn(CHECKCAST, "java/lang/reflect/Method");
mv.visitLabel(l1);
mv.visitInsn(ARETURN);
mv.visitLabel(l2);
mv.visitVarInsn(ASTORE, 3);
Label l6 = new Label();
mv.visitLabel(l6);
// Don't print the exception if just unwrapping it
// mv.visitVarInsn(ALOAD, 3);
// mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "printStackTrace", "()V");
Label l7 = new Label();
mv.visitLabel(l7);
mv.visitVarInsn(ALOAD, 3);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "getCause", "()Ljava/lang/Throwable;", false);
mv.visitTypeInsn(INSTANCEOF, "java/lang/NoSuchMethodException");
Label l8 = new Label();
mv.visitJumpInsn(IFEQ, l8);
Label l9 = new Label();
mv.visitLabel(l9);
mv.visitVarInsn(ALOAD, 3);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "getCause", "()Ljava/lang/Throwable;", false);
mv.visitTypeInsn(CHECKCAST, "java/lang/NoSuchMethodException");
mv.visitInsn(ATHROW);
mv.visitLabel(l3);
mv.visitVarInsn(ASTORE, 3);
Label l10 = new Label();
mv.visitLabel(l10);
mv.visitVarInsn(ALOAD, 3);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Exception", "printStackTrace", "()V", false);
mv.visitLabel(l8);
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ARETURN);
Label l11 = new Label();
mv.visitLabel(l11);
// mv.visitLocalVariable("clazz", "Ljava/lang/Class;", "Ljava/lang/Class<*>;", l4, l11, 0);
// mv.visitLocalVariable("methodname", "Ljava/lang/String;", null, l4, l11, 1);
// mv.visitLocalVariable("parameterTypes", "[Ljava/lang/Class;", null, l4, l11, 2);
// mv.visitLocalVariable("ite", "Ljava/lang/reflect/InvocationTargetException;", null, l6, l3, 3);
// mv.visitLocalVariable("e", "Ljava/lang/Exception;", null, l10, l8, 3);
mv.visitMaxs(6, 4);
mv.visitEnd();
}
public static void generateJLCMethod(ClassWriter cw, String classname, String operation) {
if (operation.equals("getDeclaredMethod")) {
generateJLCMethod(cw, classname, "__sljlcgdm", "getDeclaredMethod");
} else if (operation.equals("getMethod")) {
generateJLCMethod(cw, classname, "__sljlcgm", "getMethod");
} else {
throw new IllegalStateException("nyi:" + operation);
}
}
public static void generateJLC(ClassWriter cw, String classname, String operation) {
if (operation.equals("getDeclaredField")) {
generateJLCGDF(cw, classname, "__sljlcgdf", "getDeclaredField");
} else if (operation.equals("getField")) {
generateJLCGDF(cw, classname, "__sljlcgf", "getField");
} else {
throw new IllegalStateException("nyi:" + operation);
}
}
public static void generateJLCGDF(ClassWriter cw, String classname, String fieldname, String methodname) {
FieldVisitor fv = cw.visitField(ACC_PUBLIC_STATIC, fieldname, "Ljava/lang/reflect/Method;", null, null);
fv.visitEnd();
MethodVisitor mv = cw.visitMethod(ACC_PRIVATE + ACC_STATIC, fieldname,
"(Ljava/lang/Class;Ljava/lang/String;)Ljava/lang/reflect/Field;", null,
new String[] { "java/lang/NoSuchFieldException" });
mv.visitCode();
Label l0 = new Label();
Label l1 = new Label();
Label l2 = new Label();
mv.visitTryCatchBlock(l0, l1, l2, "java/lang/reflect/InvocationTargetException");
Label l3 = new Label();
mv.visitTryCatchBlock(l0, l1, l3, "java/lang/Exception");
Label l4 = new Label();
mv.visitLabel(l4);
mv.visitFieldInsn(GETSTATIC, classname, fieldname, "Ljava/lang/reflect/Method;");
mv.visitJumpInsn(IFNONNULL, l0);
Label l5 = new Label();
mv.visitLabel(l5);
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", methodname, "(Ljava/lang/String;)Ljava/lang/reflect/Field;", false);
mv.visitInsn(ARETURN);
mv.visitLabel(l0);
mv.visitFieldInsn(GETSTATIC, classname, fieldname, "Ljava/lang/reflect/Method;");
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ICONST_2);
mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
mv.visitInsn(DUP);
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ALOAD, 0);
mv.visitInsn(AASTORE);
mv.visitInsn(DUP);
mv.visitInsn(ICONST_1);
mv.visitVarInsn(ALOAD, 1);
mv.visitInsn(AASTORE);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "invoke",
"(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", false);
mv.visitTypeInsn(CHECKCAST, "java/lang/reflect/Field");
mv.visitLabel(l1);
mv.visitInsn(ARETURN);
mv.visitLabel(l2);
mv.visitVarInsn(ASTORE, 2);
Label l6 = new Label();
mv.visitLabel(l6);
mv.visitVarInsn(ALOAD, 2);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "getCause", "()Ljava/lang/Throwable;", false);
mv.visitTypeInsn(INSTANCEOF, "java/lang/NoSuchFieldException");
Label l7 = new Label();
mv.visitJumpInsn(IFEQ, l7);
Label l8 = new Label();
mv.visitLabel(l8);
mv.visitVarInsn(ALOAD, 2);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "getCause", "()Ljava/lang/Throwable;", false);
mv.visitTypeInsn(CHECKCAST, "java/lang/NoSuchFieldException");
mv.visitInsn(ATHROW);
mv.visitLabel(l3);
mv.visitVarInsn(ASTORE, 2);
mv.visitLabel(l7);
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ARETURN);
Label l9 = new Label();
mv.visitLabel(l9);
// mv.visitLocalVariable("clazz", "Ljava/lang/Class;", "Ljava/lang/Class<*>;", l4, l9, 0);
// mv.visitLocalVariable("fieldname", "Ljava/lang/String;", null, l4, l9, 1);
// mv.visitLocalVariable("ite", "Ljava/lang/reflect/InvocationTargetException;", null, l6, l3, 2);
mv.visitMaxs(6, 3);
mv.visitEnd();
}
public static void generateJLCGetXXXMethods(ClassWriter cw, String classname, String variant) {
if (variant.equals("getDeclaredMethods")) {
generateJLCGDMS(cw, classname, "__sljlcgdms", "getDeclaredMethods");
} else if (variant.equals("getMethods")) {
generateJLCGDMS(cw, classname, "__sljlcgms", "getMethods");
} else {
throw new IllegalStateException(variant);
}
}
// TODO remove extraneous visits to things like lvar names
public static void generateJLCGDMS(ClassWriter cw, String classname, String field, String methodname) {
FieldVisitor fv = cw.visitField(ACC_PUBLIC + ACC_STATIC, field, "Ljava/lang/reflect/Method;", null, null);
fv.visitEnd();
MethodVisitor mv = cw.visitMethod(ACC_PRIVATE + ACC_STATIC, field, "(Ljava/lang/Class;)[Ljava/lang/reflect/Method;", null,
null);
mv.visitCode();
Label l0 = new Label();
Label l1 = new Label();
Label l2 = new Label();
mv.visitTryCatchBlock(l0, l1, l2, "java/lang/Exception");
Label l3 = new Label();
mv.visitLabel(l3);
mv.visitFieldInsn(GETSTATIC, classname, field, "Ljava/lang/reflect/Method;");
mv.visitJumpInsn(IFNONNULL, l0);
Label l4 = new Label();
mv.visitLabel(l4);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", methodname, "()[Ljava/lang/reflect/Method;", false);
mv.visitInsn(ARETURN);
mv.visitLabel(l0);
mv.visitFieldInsn(GETSTATIC, classname, field, "Ljava/lang/reflect/Method;");
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ICONST_1);
mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
mv.visitInsn(DUP);
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ALOAD, 0);
mv.visitInsn(AASTORE);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "invoke",
"(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", false);
mv.visitTypeInsn(CHECKCAST, "[Ljava/lang/reflect/Method;");
mv.visitLabel(l1);
mv.visitInsn(ARETURN);
mv.visitLabel(l2);
mv.visitVarInsn(ASTORE, 1);
Label l5 = new Label();
mv.visitLabel(l5);
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ARETURN);
Label l6 = new Label();
mv.visitLabel(l6);
// mv.visitLocalVariable("clazz", "Ljava/lang/Class;", "Ljava/lang/Class<*>;", l3, l6, 0);
// mv.visitLocalVariable("e", "Ljava/lang/Exception;", null, l5, l6, 1);
mv.visitMaxs(6, 2);
mv.visitEnd();
}
public static void generateJLCGDFS(ClassWriter cw, String classname) {
FieldVisitor fv = cw.visitField(ACC_PUBLIC_STATIC, "__sljlcgdfs", "Ljava/lang/reflect/Method;", null, null);
fv.visitEnd();
MethodVisitor mv = cw.visitMethod(ACC_PRIVATE + ACC_STATIC, "__sljlcgdfs", "(Ljava/lang/Class;)[Ljava/lang/reflect/Field;",
null, null);
mv.visitCode();
Label l0 = new Label();
Label l1 = new Label();
Label l2 = new Label();
mv.visitTryCatchBlock(l0, l1, l2, "java/lang/Exception");
Label l3 = new Label();
mv.visitLabel(l3);
mv.visitFieldInsn(GETSTATIC, classname, "__sljlcgdfs", "Ljava/lang/reflect/Method;");
mv.visitJumpInsn(IFNONNULL, l0);
Label l4 = new Label();
mv.visitLabel(l4);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", "getDeclaredFields", "()[Ljava/lang/reflect/Field;", false);
mv.visitInsn(ARETURN);
mv.visitLabel(l0);
mv.visitFieldInsn(GETSTATIC, classname, "__sljlcgdfs", "Ljava/lang/reflect/Method;");
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ICONST_1);
mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
mv.visitInsn(DUP);
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ALOAD, 0);
mv.visitInsn(AASTORE);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "invoke",
"(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", false);
mv.visitTypeInsn(CHECKCAST, "[Ljava/lang/reflect/Field;");
mv.visitLabel(l1);
mv.visitInsn(ARETURN);
mv.visitLabel(l2);
mv.visitVarInsn(ASTORE, 1);
Label l5 = new Label();
mv.visitLabel(l5);
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ARETURN);
Label l6 = new Label();
mv.visitLabel(l6);
// mv.visitLocalVariable("clazz", "Ljava/lang/Class;", "Ljava/lang/Class<*>;", l3, l6, 0);
// mv.visitLocalVariable("e", "Ljava/lang/Exception;", null, l5, l6, 1);
mv.visitMaxs(6, 2);
mv.visitEnd();
}
// Can be useful for debugging, insert printlns
// private static void insertPrintln(MethodVisitor mv, String message) {
// mv.visitFieldInsn(GETSTATIC, "java/lang/System", "err", "Ljava/io/PrintStream;");
// mv.visitLdcInsn(message);
// mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V");
// }
}