/*******************************************************************************
* Copyright (c) 2005 Contributors.
* All rights reserved.
* This program and the accompanying materials are made available
* under the terms of the Eclipse Public License v1.0
* which accompanies this distribution and is available at
* http://eclipse.org/legal/epl-v10.html
*
* Contributors:
* initial implementation Alexandre Vasseur
*******************************************************************************/
package org.aspectj.weaver.bcel;
import org.aspectj.apache.bcel.Constants;
import org.aspectj.apache.bcel.generic.ATHROW;
import org.aspectj.apache.bcel.generic.BranchInstruction;
import org.aspectj.apache.bcel.generic.InstructionConstants;
import org.aspectj.apache.bcel.generic.InstructionFactory;
import org.aspectj.apache.bcel.generic.InstructionHandle;
import org.aspectj.apache.bcel.generic.InstructionList;
import org.aspectj.apache.bcel.generic.NOP;
import org.aspectj.apache.bcel.generic.ObjectType;
import org.aspectj.apache.bcel.generic.POP;
import org.aspectj.apache.bcel.generic.PUSH;
import org.aspectj.apache.bcel.generic.ReferenceType;
import org.aspectj.apache.bcel.generic.Type;
import org.aspectj.weaver.AjAttribute;
import org.aspectj.weaver.AjcMemberMaker;
import org.aspectj.weaver.Member;
import org.aspectj.weaver.NameMangler;
import org.aspectj.weaver.ResolvedMember;
import org.aspectj.weaver.ResolvedType;
import org.aspectj.weaver.UnresolvedType;
import org.aspectj.weaver.patterns.PerClause;
/**
* Adds aspectOf, hasAspect etc to the annotation defined aspects
*
* @author <a href="mailto:alex AT gnilux DOT com">Alexandre Vasseur</a>
*/
public class BcelPerClauseAspectAdder extends BcelTypeMunger {
private PerClause.Kind kind;
private boolean hasGeneratedInner = false;
public BcelPerClauseAspectAdder(ResolvedType aspect, PerClause.Kind kind) {
super(null,aspect);
this.kind = kind;
if (kind == PerClause.SINGLETON || kind == PerClause.PERTYPEWITHIN || kind == PerClause.PERCFLOW) {
// no inner needed
hasGeneratedInner = true;
}
}
public boolean munge(BcelClassWeaver weaver) {
LazyClassGen gen = weaver.getLazyClassGen();
doAggressiveInner(gen);
// Only munge the aspect type
if (!gen.getType().equals(aspectType)) {
return false;
}
return doMunge(gen, true);
}
public boolean forceMunge(LazyClassGen gen, boolean checkAlreadyThere) {
doAggressiveInner(gen);
return doMunge(gen, checkAlreadyThere);
}
private void doAggressiveInner(LazyClassGen gen) {
// agressively generate the inner interface if any
// Note: we do so because of the bug #75442 that leads to have this interface implemented by all classes and not
// only those matched by the per clause, which fails under LTW since the very first class
// gets weaved and impl this interface that is still not defined.
if (!hasGeneratedInner) {
if (kind == PerClause.PEROBJECT) {//redundant test - see constructor, but safer
//inner class
UnresolvedType interfaceTypeX = AjcMemberMaker.perObjectInterfaceType(aspectType);
LazyClassGen interfaceGen = new LazyClassGen(
interfaceTypeX.getName(),
"java.lang.Object",
null,
Constants.ACC_INTERFACE + Constants.ACC_PUBLIC + Constants.ACC_ABSTRACT,
new String[0],
getWorld()
);
interfaceGen.addMethodGen(makeMethodGen(interfaceGen, AjcMemberMaker.perObjectInterfaceGet(aspectType)));
interfaceGen.addMethodGen(makeMethodGen(interfaceGen, AjcMemberMaker.perObjectInterfaceSet(aspectType)));
//not really an inner class of it but that does not matter, we pass back to the LTW
gen.addGeneratedInner(interfaceGen);
}
hasGeneratedInner = true;
}
}
private boolean doMunge(LazyClassGen gen, boolean checkAlreadyThere) {
if (checkAlreadyThere && hasPerClauseMembersAlready(gen)) {
return false;
}
generatePerClauseMembers(gen);
if (kind == PerClause.SINGLETON) {
generatePerSingletonAspectOfMethod(gen);
generatePerSingletonHasAspectMethod(gen);
generatePerSingletonAjcClinitMethod(gen);
} else if (kind == PerClause.PEROBJECT) {
generatePerObjectAspectOfMethod(gen);
generatePerObjectHasAspectMethod(gen);
generatePerObjectBindMethod(gen);
generatePerObjectGetSetMethods(gen);
} else if (kind == PerClause.PERCFLOW) {
generatePerCflowAspectOfMethod(gen);
generatePerCflowHasAspectMethod(gen);
generatePerCflowPushMethod(gen);
generatePerCflowAjcClinitMethod(gen);
} else if (kind == PerClause.PERTYPEWITHIN) {
generatePerTWAspectOfMethod(gen);
generatePerTWHasAspectMethod(gen);
generatePerTWGetInstanceMethod(gen);
generatePerTWCreateAspectInstanceMethod(gen);
} else {
throw new Error("should not happen - not such kind " + kind.getName());
}
return true;
}
public ResolvedMember getMatchingSyntheticMember(Member member) {
return null;
}
public ResolvedMember getSignature() {
return null;
}
public boolean matches(ResolvedType onType) {
//we cannot return onType.equals(aspectType)
//since we need to eagerly create the nested ajcMighHaveAspect interface on LTW
return true;
//return aspectType.equals(onType);
}
private boolean hasPerClauseMembersAlready(LazyClassGen classGen) {
ResolvedMember[] methods = classGen.getBcelObjectType().getDeclaredMethods();
for (int i = 0; i < methods.length; i++) {
ResolvedMember method = methods[i];
if ("aspectOf".equals(method.getName())) {
if ("()".equals(method.getParameterSignature()) && (kind == PerClause.SINGLETON || kind == PerClause.PERCFLOW)) {
return true;
} else if ("(Ljava/lang/Object;)".equals(method.getParameterSignature()) && kind == PerClause.PEROBJECT) {
return true;
} else if ("(Ljava/lang/Class;)".equals(method.getParameterSignature()) && kind == PerClause.PERTYPEWITHIN) {
return true;
}
}
}
return false;
}
private void generatePerClauseMembers(LazyClassGen classGen) {
//FIXME Alex handle when field already there - or handle it with / similar to isAnnotationDefinedAspect()
// for that use aspectType and iterate on the fields.
//FIXME Alex percflowX is not using this one but AJ code style does generate it so..
ResolvedMember failureFieldInfo = AjcMemberMaker.initFailureCauseField(aspectType);
classGen.addField(makeFieldGen(classGen, failureFieldInfo).getField(), null);
if (kind == PerClause.SINGLETON) {
ResolvedMember perSingletonFieldInfo = AjcMemberMaker.perSingletonField(aspectType);
classGen.addField(makeFieldGen(classGen, perSingletonFieldInfo).getField(), null);
} else if (kind == PerClause.PEROBJECT) {
ResolvedMember perObjectFieldInfo = AjcMemberMaker.perObjectField(aspectType, aspectType);
classGen.addField(makeFieldGen(classGen, perObjectFieldInfo).getField(), null);
// if lazy generation of the inner interface MayHaveAspect works on LTW (see previous note)
// it should be done here.
} else if (kind == PerClause.PERCFLOW) {
ResolvedMember perCflowFieldInfo = AjcMemberMaker.perCflowField(aspectType);
classGen.addField(makeFieldGen(classGen, perCflowFieldInfo).getField(), null);
} else if (kind == PerClause.PERTYPEWITHIN) {
ResolvedMember perTypeWithinForField = AjcMemberMaker.perTypeWithinWithinTypeField(aspectType, aspectType);
classGen.addField(makeFieldGen(classGen, perTypeWithinForField).getField(), null);
} else {
throw new Error("Should not happen - no such kind " + kind.toString());
}
}
private void generatePerSingletonAspectOfMethod(LazyClassGen classGen) {
InstructionFactory factory = classGen.getFactory();
LazyMethodGen method = makeMethodGen(classGen, AjcMemberMaker.perSingletonAspectOfMethod(aspectType));
flagAsSynthetic(method, false);
classGen.addMethodGen(method);
InstructionList il = method.getBody();
il.append(Utility.createGet(factory, AjcMemberMaker.perSingletonField(aspectType)));
BranchInstruction ifNotNull = InstructionFactory.createBranchInstruction(Constants.IFNONNULL, null);
il.append(ifNotNull);
il.append(factory.createNew(AjcMemberMaker.NO_ASPECT_BOUND_EXCEPTION.getName()));
il.append(InstructionConstants.DUP);
il.append(new PUSH(classGen.getConstantPoolGen(), aspectType.getName()));
il.append(Utility.createGet(factory, AjcMemberMaker.initFailureCauseField(aspectType)));
il.append(factory.createInvoke(AjcMemberMaker.NO_ASPECT_BOUND_EXCEPTION.getName(), "<init>", Type.VOID, new Type[] { Type.STRING, new ObjectType("java.lang.Throwable") }, Constants.INVOKESPECIAL));
il.append(InstructionConstants.ATHROW);
InstructionHandle ifElse = il.append(Utility.createGet(factory, AjcMemberMaker.perSingletonField(aspectType)));
il.append(InstructionFactory.createReturn(Type.OBJECT));
ifNotNull.setTarget(ifElse);
}
private void generatePerSingletonHasAspectMethod(LazyClassGen classGen) {
InstructionFactory factory = classGen.getFactory();
LazyMethodGen method = makeMethodGen(classGen, AjcMemberMaker.perSingletonHasAspectMethod(aspectType));
flagAsSynthetic(method, false);
classGen.addMethodGen(method);
InstructionList il = method.getBody();
il.append(Utility.createGet(factory, AjcMemberMaker.perSingletonField(aspectType)));
BranchInstruction ifNull = InstructionFactory.createBranchInstruction(Constants.IFNULL, null);
il.append(ifNull);
il.append(new PUSH(classGen.getConstantPoolGen(), true));
il.append(InstructionFactory.createReturn(Type.INT));
InstructionHandle ifElse = il.append(new PUSH(classGen.getConstantPoolGen(), false));
il.append(InstructionFactory.createReturn(Type.INT));
ifNull.setTarget(ifElse);
}
private void generatePerSingletonAjcClinitMethod(LazyClassGen classGen) {
InstructionFactory factory = classGen.getFactory();
LazyMethodGen method = makeMethodGen(classGen, AjcMemberMaker.ajcPostClinitMethod(aspectType));
flagAsSynthetic(method, true);
classGen.addMethodGen(method);
InstructionList il = method.getBody();
il.append(factory.createNew(aspectType.getName()));
il.append(InstructionConstants.DUP);
il.append(factory.createInvoke(aspectType.getName(), "<init>", Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL));
il.append(Utility.createSet(factory, AjcMemberMaker.perSingletonField(aspectType)));
il.append(InstructionFactory.createReturn(Type.VOID));
// patch <clinit> to delegate to ajc$postClinit at the end
LazyMethodGen clinit = classGen.getStaticInitializer();
il = new InstructionList();
InstructionHandle tryStart = il.append(factory.createInvoke(aspectType.getName(), NameMangler.AJC_POST_CLINIT_NAME, Type.VOID, Type.NO_ARGS, Constants.INVOKESTATIC));
BranchInstruction tryEnd = InstructionFactory.createBranchInstruction(Constants.GOTO, null);
il.append(tryEnd);
InstructionHandle handler = il.append(InstructionConstants.ASTORE_0);
il.append(InstructionConstants.ALOAD_0);
il.append(Utility.createSet(factory, AjcMemberMaker.initFailureCauseField(aspectType)));
il.append(InstructionFactory.createReturn(Type.VOID));
tryEnd.setTarget(il.getEnd());
// replace the original "return" with a "nop"
//TODO AV - a bit odd, looks like Bcel alters bytecode and has a IMPDEP1 in its representation
if (clinit.getBody().getEnd().getInstruction().getOpcode() == Constants.IMPDEP1) {
clinit.getBody().getEnd().getPrev().setInstruction(new NOP());
}
clinit.getBody().getEnd().setInstruction(new NOP());
clinit.getBody().append(il);
clinit.addExceptionHandler(
tryStart, handler, handler, new ObjectType("java.lang.Throwable"), false
);
}
private void generatePerObjectAspectOfMethod(LazyClassGen classGen) {
InstructionFactory factory = classGen.getFactory();
ReferenceType interfaceType = (ReferenceType) BcelWorld.makeBcelType(AjcMemberMaker.perObjectInterfaceType(aspectType));
LazyMethodGen method = makeMethodGen(classGen, AjcMemberMaker.perObjectAspectOfMethod(aspectType));
flagAsSynthetic(method, false);
classGen.addMethodGen(method);
InstructionList il = method.getBody();
il.append(InstructionConstants.ALOAD_0);
il.append(factory.createInstanceOf(interfaceType));
BranchInstruction ifEq = InstructionFactory.createBranchInstruction(Constants.IFEQ, null);
il.append(ifEq);
il.append(InstructionConstants.ALOAD_0);
il.append(factory.createCheckCast(interfaceType));
il.append(Utility.createInvoke(factory, Constants.INVOKEINTERFACE, AjcMemberMaker.perObjectInterfaceGet(aspectType)));
il.append(InstructionConstants.DUP);
BranchInstruction ifNull = InstructionFactory.createBranchInstruction(Constants.IFNULL, null);
il.append(ifNull);
il.append(InstructionFactory.createReturn(BcelWorld.makeBcelType(aspectType)));
InstructionHandle ifNullElse = il.append(new POP());
ifNull.setTarget(ifNullElse);
InstructionHandle ifEqElse = il.append(factory.createNew(AjcMemberMaker.NO_ASPECT_BOUND_EXCEPTION.getName()));
ifEq.setTarget(ifEqElse);
il.append(InstructionConstants.DUP);
il.append(factory.createInvoke(AjcMemberMaker.NO_ASPECT_BOUND_EXCEPTION.getName(), "<init>", Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL));
il.append(new ATHROW());
}
private void generatePerObjectHasAspectMethod(LazyClassGen classGen) {
InstructionFactory factory = classGen.getFactory();
ReferenceType interfaceType = (ReferenceType) BcelWorld.makeBcelType(AjcMemberMaker.perObjectInterfaceType(aspectType));
LazyMethodGen method = makeMethodGen(classGen, AjcMemberMaker.perObjectHasAspectMethod(aspectType));
flagAsSynthetic(method, false);
classGen.addMethodGen(method);
InstructionList il = method.getBody();
il.append(InstructionConstants.ALOAD_0);
il.append(factory.createInstanceOf(interfaceType));
BranchInstruction ifEq = InstructionFactory.createBranchInstruction(Constants.IFEQ, null);
il.append(ifEq);
il.append(InstructionConstants.ALOAD_0);
il.append(factory.createCheckCast(interfaceType));
il.append(Utility.createInvoke(factory, Constants.INVOKEINTERFACE, AjcMemberMaker.perObjectInterfaceGet(aspectType)));
BranchInstruction ifNull = InstructionFactory.createBranchInstruction(Constants.IFNULL, null);
il.append(ifNull);
il.append(InstructionConstants.ICONST_1);
il.append(InstructionFactory.createReturn(Type.INT));
InstructionHandle ifEqElse = il.append(InstructionConstants.ICONST_0);
ifEq.setTarget(ifEqElse);
ifNull.setTarget(ifEqElse);
il.append(InstructionFactory.createReturn(Type.INT));
}
private void generatePerObjectBindMethod(LazyClassGen classGen) {
InstructionFactory factory = classGen.getFactory();
ReferenceType interfaceType = (ReferenceType) BcelWorld.makeBcelType(AjcMemberMaker.perObjectInterfaceType(aspectType));
LazyMethodGen method = makeMethodGen(classGen, AjcMemberMaker.perObjectBind(aspectType));
flagAsSynthetic(method, true);
classGen.addMethodGen(method);
InstructionList il = method.getBody();
il.append(InstructionConstants.ALOAD_0);
il.append(factory.createInstanceOf(interfaceType));
BranchInstruction ifEq = InstructionFactory.createBranchInstruction(Constants.IFEQ, null);
il.append(ifEq);
il.append(InstructionConstants.ALOAD_0);
il.append(factory.createCheckCast(interfaceType));
il.append(Utility.createInvoke(factory, Constants.INVOKEINTERFACE, AjcMemberMaker.perObjectInterfaceGet(aspectType)));
BranchInstruction ifNonNull = InstructionFactory.createBranchInstruction(Constants.IFNONNULL, null);
il.append(ifNonNull);
il.append(InstructionConstants.ALOAD_0);
il.append(factory.createCheckCast(interfaceType));
il.append(factory.createNew(aspectType.getName()));
il.append(InstructionConstants.DUP);
il.append(factory.createInvoke(aspectType.getName(), "<init>", Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL));
il.append(Utility.createInvoke(factory, Constants.INVOKEINTERFACE, AjcMemberMaker.perObjectInterfaceSet(aspectType)));
InstructionHandle end = il.append(InstructionFactory.createReturn(Type.VOID));
ifEq.setTarget(end);
ifNonNull.setTarget(end);
}
private void generatePerObjectGetSetMethods(LazyClassGen classGen) {
InstructionFactory factory = classGen.getFactory();
LazyMethodGen methodGet = makeMethodGen(classGen, AjcMemberMaker.perObjectInterfaceGet(aspectType));
flagAsSynthetic(methodGet, true);
classGen.addMethodGen(methodGet);
InstructionList ilGet = methodGet.getBody();
ilGet = new InstructionList();
ilGet.append(InstructionConstants.ALOAD_0);
ilGet.append(Utility.createGet(factory, AjcMemberMaker.perObjectField(aspectType, aspectType)));
ilGet.append(InstructionFactory.createReturn(Type.OBJECT));
LazyMethodGen methodSet = makeMethodGen(classGen, AjcMemberMaker.perObjectInterfaceSet(aspectType));
flagAsSynthetic(methodSet, true);
classGen.addMethodGen(methodSet);
InstructionList ilSet = methodSet.getBody();
ilSet = new InstructionList();
ilSet.append(InstructionConstants.ALOAD_0);
ilSet.append(InstructionConstants.ALOAD_1);
ilSet.append(Utility.createSet(factory, AjcMemberMaker.perObjectField(aspectType, aspectType)));
ilSet.append(InstructionFactory.createReturn(Type.VOID));
}
private void generatePerCflowAspectOfMethod(LazyClassGen classGen) {
InstructionFactory factory = classGen.getFactory();
LazyMethodGen method = makeMethodGen(classGen, AjcMemberMaker.perCflowAspectOfMethod(aspectType));
flagAsSynthetic(method, false);
classGen.addMethodGen(method);
InstructionList il = method.getBody();
il.append(Utility.createGet(factory, AjcMemberMaker.perCflowField(aspectType)));
il.append(Utility.createInvoke(factory, Constants.INVOKEVIRTUAL, AjcMemberMaker.cflowStackPeekInstance()));
il.append(factory.createCheckCast((ReferenceType)BcelWorld.makeBcelType(aspectType)));
il.append(InstructionFactory.createReturn(Type.OBJECT));
}
private void generatePerCflowHasAspectMethod(LazyClassGen classGen) {
InstructionFactory factory = classGen.getFactory();
LazyMethodGen method = makeMethodGen(classGen, AjcMemberMaker.perCflowHasAspectMethod(aspectType));
flagAsSynthetic(method, false);
classGen.addMethodGen(method);
InstructionList il = method.getBody();
il.append(Utility.createGet(factory, AjcMemberMaker.perCflowField(aspectType)));
il.append(Utility.createInvoke(factory, Constants.INVOKEVIRTUAL, AjcMemberMaker.cflowStackIsValid()));
il.append(InstructionFactory.createReturn(Type.INT));
}
private void generatePerCflowPushMethod(LazyClassGen classGen) {
InstructionFactory factory = classGen.getFactory();
LazyMethodGen method = makeMethodGen(classGen, AjcMemberMaker.perCflowPush(aspectType));
flagAsSynthetic(method, true);
classGen.addMethodGen(method);
InstructionList il = method.getBody();
il.append(Utility.createGet(factory, AjcMemberMaker.perCflowField(aspectType)));
il.append(factory.createNew(aspectType.getName()));
il.append(InstructionConstants.DUP);
il.append(factory.createInvoke(aspectType.getName(), "<init>", Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL));
il.append(Utility.createInvoke(factory, Constants.INVOKEVIRTUAL, AjcMemberMaker.cflowStackPushInstance()));
il.append(InstructionFactory.createReturn(Type.VOID));
}
private void generatePerCflowAjcClinitMethod(LazyClassGen classGen) {
InstructionFactory factory = classGen.getFactory();
LazyMethodGen method = makeMethodGen(classGen, AjcMemberMaker.ajcPreClinitMethod(aspectType));
flagAsSynthetic(method, true);
classGen.addMethodGen(method);
InstructionList il = method.getBody();
il.append(factory.createNew(AjcMemberMaker.CFLOW_STACK_TYPE.getName()));
il.append(InstructionConstants.DUP);
il.append(factory.createInvoke(AjcMemberMaker.CFLOW_STACK_TYPE.getName(), "<init>", Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL));
il.append(Utility.createSet(factory, AjcMemberMaker.perCflowField(aspectType)));
il.append(InstructionFactory.createReturn(Type.VOID));
// patch <clinit> to delegate to ajc$preClinit at the beginning
LazyMethodGen clinit = classGen.getStaticInitializer();
il = new InstructionList();
il.append(factory.createInvoke(aspectType.getName(), NameMangler.AJC_PRE_CLINIT_NAME, Type.VOID, Type.NO_ARGS, Constants.INVOKESTATIC));
clinit.getBody().insert(il);
}
private void generatePerTWAspectOfMethod(LazyClassGen classGen) {
InstructionFactory factory = classGen.getFactory();
LazyMethodGen method = makeMethodGen(classGen, AjcMemberMaker.perTypeWithinAspectOfMethod(aspectType,classGen.getWorld().isInJava5Mode()));
flagAsSynthetic(method, false);
classGen.addMethodGen(method);
InstructionList il = method.getBody();
InstructionHandle tryStart = il.append(InstructionConstants.ALOAD_0);
il.append(Utility.createInvoke(
factory,
Constants.INVOKESTATIC,
AjcMemberMaker.perTypeWithinGetInstance(aspectType)
));
il.append(InstructionConstants.ASTORE_1);
il.append(InstructionConstants.ALOAD_1);
BranchInstruction ifNonNull = InstructionFactory.createBranchInstruction(Constants.IFNONNULL, null);
il.append(ifNonNull);
il.append(factory.createNew(AjcMemberMaker.NO_ASPECT_BOUND_EXCEPTION.getName()));
il.append(InstructionConstants.DUP);
il.append(new PUSH(classGen.getConstantPoolGen(), aspectType.getName()));
il.append(InstructionConstants.ACONST_NULL);
il.append(factory.createInvoke(AjcMemberMaker.NO_ASPECT_BOUND_EXCEPTION.getName(), "<init>", Type.VOID, new Type[] { Type.STRING, new ObjectType("java.lang.Throwable") }, Constants.INVOKESPECIAL));
il.append(InstructionConstants.ATHROW);
InstructionHandle ifElse = il.append(InstructionConstants.ALOAD_1);
ifNonNull.setTarget(ifElse);
il.append(InstructionFactory.createReturn(Type.OBJECT));
InstructionHandle handler = il.append(InstructionConstants.ASTORE_1);
il.append(factory.createNew(AjcMemberMaker.NO_ASPECT_BOUND_EXCEPTION.getName()));
il.append(InstructionConstants.DUP);
il.append(factory.createInvoke(AjcMemberMaker.NO_ASPECT_BOUND_EXCEPTION.getName(), "<init>", Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL));
il.append(InstructionConstants.ATHROW);
method.addExceptionHandler(
tryStart, handler.getPrev(), handler, new ObjectType("java.lang.Exception"), false
);
}
private void generatePerTWHasAspectMethod(LazyClassGen classGen) {
InstructionFactory factory = classGen.getFactory();
LazyMethodGen method = makeMethodGen(classGen, AjcMemberMaker.perTypeWithinHasAspectMethod(aspectType,classGen.getWorld().isInJava5Mode()));
flagAsSynthetic(method, false);
classGen.addMethodGen(method);
InstructionList il = method.getBody();
InstructionHandle tryStart = il.append(InstructionConstants.ALOAD_0);
il.append(Utility.createInvoke(
factory,
Constants.INVOKESTATIC,
AjcMemberMaker.perTypeWithinGetInstance(aspectType)
));
BranchInstruction ifNull = InstructionFactory.createBranchInstruction(Constants.IFNULL, null);
il.append(ifNull);
il.append(InstructionConstants.ICONST_1);
il.append(InstructionConstants.IRETURN);
InstructionHandle ifElse = il.append(InstructionConstants.ICONST_0);
ifNull.setTarget(ifElse);
il.append(InstructionConstants.IRETURN);
InstructionHandle handler = il.append(InstructionConstants.ASTORE_1);
il.append(InstructionConstants.ICONST_0);
il.append(InstructionConstants.IRETURN);
method.addExceptionHandler(
tryStart, handler.getPrev(), handler, new ObjectType("java.lang.Exception"), false
);
}
private void generatePerTWGetInstanceMethod(LazyClassGen classGen) {
InstructionFactory factory = classGen.getFactory();
LazyMethodGen method = makeMethodGen(classGen, AjcMemberMaker.perTypeWithinGetInstance(aspectType));
flagAsSynthetic(method, true);
classGen.addMethodGen(method);
InstructionList il = method.getBody();
InstructionHandle tryStart = il.append(InstructionConstants.ALOAD_0);
il.append(new PUSH(factory.getConstantPool(), NameMangler.perTypeWithinLocalAspectOf(aspectType)));
il.append(InstructionConstants.ACONST_NULL);//Class[] for "getDeclaredMethod"
il.append(factory.createInvoke(
"java/lang/Class",
"getDeclaredMethod",
Type.getType("Ljava/lang/reflect/Method;"),
new Type[]{Type.getType("Ljava/lang/String;"), Type.getType("[Ljava/lang/Class;")},
Constants.INVOKEVIRTUAL
));
il.append(InstructionConstants.ACONST_NULL);//Object for "invoke", static method
il.append(InstructionConstants.ACONST_NULL);//Object[] for "invoke", no arg
il.append(factory.createInvoke(
"java/lang/reflect/Method",
"invoke",
Type.OBJECT,
new Type[]{Type.getType("Ljava/lang/Object;"), Type.getType("[Ljava/lang/Object;")},
Constants.INVOKEVIRTUAL
));
il.append(factory.createCheckCast((ReferenceType) BcelWorld.makeBcelType(aspectType)));
il.append(InstructionConstants.ARETURN);
InstructionHandle handler = il.append(InstructionConstants.ASTORE_1);
il.append(InstructionConstants.ACONST_NULL);
il.append(InstructionConstants.ARETURN);
method.addExceptionHandler(
tryStart, handler.getPrev(), handler, new ObjectType("java.lang.Exception"), false
);
}
private void generatePerTWCreateAspectInstanceMethod(LazyClassGen classGen) {
InstructionFactory factory = classGen.getFactory();
LazyMethodGen method = makeMethodGen(classGen, AjcMemberMaker.perTypeWithinCreateAspectInstance(aspectType));
flagAsSynthetic(method, true);
classGen.addMethodGen(method);
InstructionList il = method.getBody();
il.append(factory.createNew(aspectType.getName()));
il.append(InstructionConstants.DUP);
il.append(factory.createInvoke(
aspectType.getName(), "<init>", Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL
));
il.append(InstructionConstants.ASTORE_1);
il.append(InstructionConstants.ALOAD_1);
il.append(InstructionConstants.ALOAD_0);
il.append(Utility.createSet(
factory,
AjcMemberMaker.perTypeWithinWithinTypeField(aspectType, aspectType)
));
il.append(InstructionConstants.ALOAD_1);
il.append(InstructionConstants.ARETURN);
}
/**
* Add standard Synthetic (if wished) and AjSynthetic (always) attributes
* @param methodGen
* @param makeJavaSynthetic true if standard Synthetic attribute must be set as well (invisible to user)
*/
private static void flagAsSynthetic(LazyMethodGen methodGen, boolean makeJavaSynthetic) {
if (makeJavaSynthetic) {
methodGen.makeSynthetic();
}
methodGen.addAttribute(
BcelAttributes.bcelAttribute(
new AjAttribute.AjSynthetic(),
methodGen.getEnclosingClass().getConstantPoolGen()
)
);
}
}