123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278 |
- /* *******************************************************************
- * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved.
- * This program and the accompanying materials are made available
- * under the terms of the Common Public License v1.0
- * which accompanies this distribution and is available at
- * http://www.eclipse.org/legal/cpl-v10.html
- *
- * Contributors:
- * PARC initial implementation
- * ******************************************************************/
-
-
- package org.aspectj.weaver.patterns;
-
- import java.io.DataInputStream;
- import java.io.DataOutputStream;
- import java.io.IOException;
- import java.lang.reflect.Modifier;
- import java.util.ArrayList;
- import java.util.Collection;
- import java.util.Hashtable;
- import java.util.List;
-
- import org.aspectj.bridge.IMessage;
- import org.aspectj.util.FileUtil;
- import org.aspectj.util.FuzzyBoolean;
- import org.aspectj.weaver.Advice;
- import org.aspectj.weaver.CrosscuttingMembers;
- import org.aspectj.weaver.ISourceContext;
- import org.aspectj.weaver.IntMap;
- import org.aspectj.weaver.Member;
- import org.aspectj.weaver.NameMangler;
- import org.aspectj.weaver.ResolvedMember;
- import org.aspectj.weaver.ResolvedPointcutDefinition;
- import org.aspectj.weaver.ResolvedTypeX;
- import org.aspectj.weaver.Shadow;
- import org.aspectj.weaver.TypeX;
- import org.aspectj.weaver.WeaverMessages;
- import org.aspectj.weaver.World;
- import org.aspectj.weaver.ast.Test;
-
-
- public class CflowPointcut extends Pointcut {
- private Pointcut entry; // The pointcut inside the cflow() that represents the 'entry' point
- private boolean isBelow;// Is this cflowbelow?
- private int[] freeVars;
-
- private static Hashtable cflowFields = new Hashtable();
- private static Hashtable cflowBelowFields = new Hashtable();
-
- /**
- * Used to indicate that we're in the context of a cflow when concretizing if's
- *
- * Will be removed or replaced with something better when we handle this
- * as a non-error
- */
- public static final ResolvedPointcutDefinition CFLOW_MARKER =
- new ResolvedPointcutDefinition(null, 0, null, TypeX.NONE, Pointcut.makeMatchesNothing(Pointcut.RESOLVED));
-
-
- public CflowPointcut(Pointcut entry, boolean isBelow, int[] freeVars) {
- // System.err.println("Building cflow pointcut "+entry.toString());
- this.entry = entry;
- this.isBelow = isBelow;
- this.freeVars = freeVars;
- }
-
- public FuzzyBoolean fastMatch(FastMatchInfo type) {
- return FuzzyBoolean.MAYBE;
- }
-
- public FuzzyBoolean match(Shadow shadow) {
- //??? this is not maximally efficient
- return FuzzyBoolean.MAYBE;
- }
-
- public void write(DataOutputStream s) throws IOException {
- s.writeByte(Pointcut.CFLOW);
- entry.write(s);
- s.writeBoolean(isBelow);
- FileUtil.writeIntArray(freeVars, s);
- writeLocation(s);
- }
- public static Pointcut read(DataInputStream s, ISourceContext context) throws IOException {
-
- CflowPointcut ret = new CflowPointcut(Pointcut.read(s, context), s.readBoolean(), FileUtil.readIntArray(s));
- ret.readLocation(context, s);
- return ret;
- }
-
- public void resolveBindings(IScope scope, Bindings bindings) {
- if (bindings == null) {
- entry.resolveBindings(scope, null);
- entry.state = RESOLVED;
- freeVars = new int[0];
- } else {
- //??? for if's sake we might need to be more careful here
- Bindings entryBindings = new Bindings(bindings.size());
-
- entry.resolveBindings(scope, entryBindings);
- entry.state = RESOLVED;
-
- freeVars = entryBindings.getUsedFormals();
-
- bindings.mergeIn(entryBindings, scope);
- }
- }
-
- public void resolveBindingsFromRTTI() {
- if (entry.state != RESOLVED) {
- entry.resolveBindingsFromRTTI();
- }
- }
-
- public boolean equals(Object other) {
- if (!(other instanceof CflowPointcut)) return false;
- CflowPointcut o = (CflowPointcut)other;
- return o.entry.equals(this.entry) && o.isBelow == this.isBelow;
- }
- public int hashCode() {
- int result = 17;
- result = 37*result + entry.hashCode();
- result = 37*result + (isBelow ? 0 : 1);
- return result;
- }
- public String toString() {
- return "cflow" + (isBelow ? "below" : "") + "(" + entry + ")";
- }
-
- public Test findResidue(Shadow shadow, ExposedState state) {
- throw new RuntimeException("unimplemented");
- }
-
- public Pointcut concretize1(ResolvedTypeX inAspect, IntMap bindings) {
-
- // Enforce rule about which designators are supported in declare
- if (isDeclare(bindings.getEnclosingAdvice())) {
- inAspect.getWorld().showMessage(IMessage.ERROR,
- WeaverMessages.format(WeaverMessages.CFLOW_IN_DECLARE,isBelow?"below":""),
- bindings.getEnclosingAdvice().getSourceLocation(), null);
- return Pointcut.makeMatchesNothing(Pointcut.CONCRETE);
- }
-
- //make this remap from formal positions to arrayIndices
- IntMap entryBindings = new IntMap();
- for (int i=0, len=freeVars.length; i < len; i++) {
- int freeVar = freeVars[i];
- //int formalIndex = bindings.get(freeVar);
- entryBindings.put(freeVar, i);
- }
- entryBindings.copyContext(bindings);
- //System.out.println(this + " bindings: " + entryBindings);
-
- World world = inAspect.getWorld();
-
- Pointcut concreteEntry;
-
- ResolvedTypeX concreteAspect = bindings.getConcreteAspect();
-
- CrosscuttingMembers xcut = concreteAspect.crosscuttingMembers;
- Collection previousCflowEntries = xcut.getCflowEntries();
-
-
- entryBindings.pushEnclosingDefinition(CFLOW_MARKER);
- // This block concretizes the pointcut within the cflow pointcut
- try {
- concreteEntry = entry.concretize(inAspect, entryBindings);
- } finally {
- entryBindings.popEnclosingDefinitition();
- }
-
- List innerCflowEntries = new ArrayList(xcut.getCflowEntries());
- innerCflowEntries.removeAll(previousCflowEntries);
-
-
- Object field = getCflowfield(concreteEntry);
-
- // Four routes of interest through this code (did I hear someone say refactor??)
- // 1) no state in the cflow - we can use a counter *and* we have seen this pointcut
- // before - so use the same counter as before.
- // 2) no state in the cflow - we can use a counter, but this is the first time
- // we have seen this pointcut, so build the infrastructure.
- // 3) state in the cflow - we need to use a stack *and* we have seen this pointcut
- // before - so share the stack.
- // 4) state in the cflow - we need to use a stack, but this is the first time
- // we have seen this pointcut, so build the infrastructure.
-
- if (freeVars.length == 0) { // No state, so don't use a stack, use a counter.
- ResolvedMember localCflowField = null;
-
- // Check if we have already got a counter for this cflow pointcut
- if (field != null) {
- localCflowField = (ResolvedMember)field; // Use the one we already have
-
- } else {
-
- // Create a counter field in the aspect
- localCflowField = new ResolvedMember(Member.FIELD,concreteAspect,Modifier.STATIC | Modifier.PUBLIC | Modifier.FINAL,
- NameMangler.cflowCounter(xcut),TypeX.forName(NameMangler.CFLOW_COUNTER_TYPE).getSignature());
-
- // Create type munger to add field to the aspect
- concreteAspect.crosscuttingMembers.addTypeMunger(world.makeCflowCounterFieldAdder(localCflowField));
-
- // Create shadow munger to push stuff onto the stack
- concreteAspect.crosscuttingMembers.addConcreteShadowMunger(
- Advice.makeCflowEntry(world,concreteEntry,isBelow,localCflowField,freeVars.length,innerCflowEntries,inAspect));
-
- putCflowfield(concreteEntry,localCflowField); // Remember it
- }
- return new ConcreteCflowPointcut(localCflowField, null,true);
- } else {
-
- List slots = new ArrayList();
-
- for (int i=0, len=freeVars.length; i < len; i++) {
- int freeVar = freeVars[i];
-
- // we don't need to keep state that isn't actually exposed to advice
- //??? this means that we will store some state that we won't actually use, optimize this later
- if (!bindings.hasKey(freeVar)) continue;
-
- int formalIndex = bindings.get(freeVar);
- ResolvedTypeX formalType =
- bindings.getAdviceSignature().getParameterTypes()[formalIndex].resolve(world);
-
- ConcreteCflowPointcut.Slot slot =
- new ConcreteCflowPointcut.Slot(formalIndex, formalType, i);
- slots.add(slot);
- }
- ResolvedMember localCflowField = null;
- if (field != null) {
- localCflowField = (ResolvedMember)field;
- } else {
-
- localCflowField = new ResolvedMember(
- Member.FIELD, concreteAspect, Modifier.STATIC | Modifier.PUBLIC | Modifier.FINAL,
- NameMangler.cflowStack(xcut),
- TypeX.forName(NameMangler.CFLOW_STACK_TYPE).getSignature());
- //System.out.println("adding field to: " + inAspect + " field " + cflowField);
-
- // add field and initializer to inAspect
- //XXX and then that info above needs to be mapped down here to help with
- //XXX getting the exposed state right
- concreteAspect.crosscuttingMembers.addConcreteShadowMunger(
- Advice.makeCflowEntry(world, concreteEntry, isBelow, localCflowField, freeVars.length, innerCflowEntries,inAspect));
-
- concreteAspect.crosscuttingMembers.addTypeMunger(
- world.makeCflowStackFieldAdder(localCflowField));
- putCflowfield(concreteEntry,localCflowField);
- }
- return new ConcreteCflowPointcut(localCflowField, slots,false);
- }
-
- }
-
- public static void clearCaches() {
- cflowFields.clear();
- cflowBelowFields.clear();
- }
-
- private Object getCflowfield(Pointcut pcutkey) {
- if (isBelow) {
- return cflowBelowFields.get(pcutkey);
- } else {
- return cflowFields.get(pcutkey);
- }
- }
-
- private void putCflowfield(Pointcut pcutkey,Object o) {
- if (isBelow) {
- cflowBelowFields.put(pcutkey,o);
- } else {
- cflowFields.put(pcutkey,o);
- }
- }
-
- }
|