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- /* *******************************************************************
- * 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 Eclipse Public License v 2.0
- * which accompanies this distribution and is available at
- * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
- *
- * Contributors:
- * PARC initial implementation
- * ******************************************************************/
-
-
- package org.aspectj.ajdt.internal.compiler.ast;
-
- import org.aspectj.weaver.Advice;
- import org.aspectj.org.eclipse.jdt.internal.compiler.ASTVisitor;
- import org.aspectj.org.eclipse.jdt.internal.compiler.ast.AbstractMethodDeclaration;
- import org.aspectj.org.eclipse.jdt.internal.compiler.ast.Expression;
- import org.aspectj.org.eclipse.jdt.internal.compiler.ast.MessageSend;
- import org.aspectj.org.eclipse.jdt.internal.compiler.ast.NameReference;
- import org.aspectj.org.eclipse.jdt.internal.compiler.ast.SingleNameReference;
- import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.Binding;
- import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.BlockScope;
- import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.ClassScope;
- import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.LocalVariableBinding;
- import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.MethodBinding;
- import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding;
- import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.TypeBinding;
-
- /**
- * Takes a method that already has the three extra parameters
- * thisJoinPointStaticPart, thisJoinPoint and thisEnclosingJoinPointStaticPart
- */
-
- public class ProceedVisitor extends ASTVisitor {
- boolean needsDynamic = false;
- boolean needsStatic = false;
- boolean needsStaticEnclosing = false;
- boolean hasEffectivelyStaticRef = false;
-
- LocalVariableBinding thisJoinPointDec;
- LocalVariableBinding thisJoinPointStaticPartDec;
- LocalVariableBinding thisEnclosingJoinPointStaticPartDec;
-
- LocalVariableBinding thisJoinPointDecLocal;
- LocalVariableBinding thisJoinPointStaticPartDecLocal;
- LocalVariableBinding thisEnclosingJoinPointStaticPartDecLocal;
-
- boolean replaceEffectivelyStaticRefs = false;
-
- AbstractMethodDeclaration method;
-
- ProceedVisitor(AbstractMethodDeclaration method) {
- this.method = method;
- int index = method.arguments.length - 3;
-
- thisJoinPointStaticPartDecLocal = method.scope.locals[index];
- thisJoinPointStaticPartDec = method.arguments[index++].binding;
- thisJoinPointDecLocal = method.scope.locals[index];
- thisJoinPointDec = method.arguments[index++].binding;
- thisEnclosingJoinPointStaticPartDecLocal = method.scope.locals[index];
- thisEnclosingJoinPointStaticPartDec = method.arguments[index++].binding;
- }
-
- public void computeJoinPointParams() {
- // walk my body to see what is needed
- method.traverse(this, (ClassScope) null);
-
- //??? add support for option to disable this optimization
- //System.err.println("check: "+ hasEffectivelyStaticRef + ", " + needsDynamic);
- if (hasEffectivelyStaticRef && !needsDynamic) {
- // replace effectively static refs with thisJoinPointStaticPart
- replaceEffectivelyStaticRefs = true;
- needsStatic = true;
- method.traverse(this, (ClassScope) null);
- }
- }
-
- boolean isRef(NameReference ref, Binding binding) {
- return ref.binding == binding;
- }
-
- boolean isRef(Expression expr, Binding binding) {
- //System.err.println("isRef: " + expr + ", " + binding);
- return expr instanceof NameReference
- && isRef((NameReference)expr, binding);
- }
-
- public void endVisit(SingleNameReference ref, BlockScope scope) {
- if (isRef(ref, thisJoinPointDec))
- needsDynamic = true;
- else if (isRef(ref, thisJoinPointStaticPartDec))
- needsStatic = true;
- else if (isRef(ref, thisEnclosingJoinPointStaticPartDec))
- needsStaticEnclosing = true;
- }
-
- // public void checkAndFix(ASTObject body) {
- // this.process(body);
- // if (needsFakeStatic && !needsDynamic) {
- // if (!this.getCompiler().getOptions().noMetaJoinPointOptimization) {
- // makeFakeStatics = true;
- // needsStatic = true;
- // this.process(body);
- // } else {
- // needsDynamic = true;
- // }
- // }
- // }
-
- boolean canTreatAsStatic(String id) {
- return id.equals("toString")
- || id.equals("toShortString")
- || id.equals("toLongString")
- || id.equals("getKind")
- || id.equals("getSignature")
- || id.equals("getSourceLocation")
- || id.equals("getStaticPart");
- }
-
- // boolean canTreatAsStatic(VarExpr varExpr) {
- // ASTObject parent = varExpr.getParent();
- // if (parent instanceof CallExpr) {
- // Method calledMethod = ((CallExpr)parent).getMethod();
- // return canTreatAsStatic(calledMethod);
- //
- // //??? should add a case here to catch
- // //??? tjp.getEnclosingExecutionJoinPoint().STATIC_METHOD()
- // } else if (parent instanceof BinopExpr) {
- // BinopExpr binop = (BinopExpr)parent;
- // if (binop.getType().isEquivalent(this.getTypeManager().getStringType())) {
- // return true;
- // } else {
- // return false;
- // }
- // } else {
- // return false;
- // }
- // }
-
- boolean inBlockThatCantRun = false;
-
- public boolean visit(MessageSend call, BlockScope scope) {
- Expression receiver = call.receiver;
- if (isRef(receiver, thisJoinPointDec)) {
- if (canTreatAsStatic(new String(call.selector))) {
- if (replaceEffectivelyStaticRefs) {
- replaceEffectivelyStaticRef(call);
- } else {
- //System.err.println("has static reg");
- hasEffectivelyStaticRef = true;
- if (call.arguments != null) {
- int argumentsLength = call.arguments.length;
- for (int i = 0; i < argumentsLength; i++)
- call.arguments[i].traverse(this, scope);
- }
- return false;
- }
- }
- }
-
- return super.visit(call, scope);
- }
-
- private void replaceEffectivelyStaticRef(MessageSend call) {
- //System.err.println("replace static ref");
- NameReference receiver = (NameReference) call.receiver;
- receiver.binding = thisJoinPointStaticPartDecLocal; //thisJoinPointStaticPartDec;
- // receiver.codegenBinding = thisJoinPointStaticPartDecLocal;
-
- call.binding.declaringClass =
- (ReferenceBinding) thisJoinPointStaticPartDec.type;
- }
-
- public int removeUnusedExtraArguments() {
- int extraArgumentFlags = 0;
-
- this.computeJoinPointParams();
- MethodBinding binding = method.binding;
-
-
- int index = binding.parameters.length - 3;
- if (needsStaticEnclosing) {
- extraArgumentFlags |= Advice.ThisEnclosingJoinPointStaticPart;
- } else {
- removeParameter(index+2);
- }
-
- if (needsDynamic) {
- extraArgumentFlags |= Advice.ThisJoinPoint;
- } else {
- removeParameter(index+1);
- }
-
- if (needsStatic) {
- extraArgumentFlags |= Advice.ThisJoinPointStaticPart;
- } else {
- removeParameter(index+0);
- }
-
- return extraArgumentFlags;
- }
-
- private void removeParameter(int indexToRemove) {
- // TypeBinding[] parameters = method.binding.parameters;
- method.scope.locals = removeLocalBinding(indexToRemove, method.scope.locals);
- method.binding.parameters = removeParameter(indexToRemove, method.binding.parameters);
- }
-
-
- private static TypeBinding[] removeParameter(int index, TypeBinding[] bindings) {
- int len = bindings.length;
- TypeBinding[] ret = new TypeBinding[len-1];
- System.arraycopy(bindings, 0, ret, 0, index);
- System.arraycopy(bindings, index+1, ret, index, len-index-1);
- return ret;
- }
-
- private static LocalVariableBinding[] removeLocalBinding(int index, LocalVariableBinding[] bindings) {
- int len = bindings.length;
- //??? for performance we should do this in-place
- LocalVariableBinding[] ret = new LocalVariableBinding[len-1];
- System.arraycopy(bindings, 0, ret, 0, index);
- System.arraycopy(bindings, index+1, ret, index, len-index-1);
- return ret;
- }
-
-
- }
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