/*******************************************************************************
* Copyright (c) 2000, 2013 IBM Corporation and others.
* 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://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Nick Teryaev - fix for bug (https://bugs.eclipse.org/bugs/show_bug.cgi?id=40752)
* Stephan Herrmann - Contributions for
* bug 319201 - [null] no warning when unboxing SingleNameReference causes NPE
* bug 349326 - [1.7] new warning for missing try-with-resources
* bug 186342 - [compiler][null] Using annotations for null checking
* bug 358903 - Filter practically unimportant resource leak warnings
* bug 370639 - [compiler][resource] restore the default for resource leak warnings
* bug 345305 - [compiler][null] Compiler misidentifies a case of "variable can only be null"
* bug 388996 - [compiler][resource] Incorrect 'potential resource leak'
* bug 379784 - [compiler] "Method can be static" is not getting reported
* bug 379834 - Wrong "method can be static" in presence of qualified super and different staticness of nested super class.
* bug 388281 - [compiler][null] inheritance of null annotations as an option
* bug 394768 - [compiler][resource] Incorrect resource leak warning when creating stream in conditional
* bug 381445 - [compiler][resource] Can the resource leak check be made aware of Closeables.closeQuietly?
* bug 331649 - [compiler][null] consider null annotations for fields
* bug 383368 - [compiler][null] syntactic null analysis for field references
* bug 382069 - [null] Make the null analysis consider JUnit's assertNotNull similarly to assertions
* bug 403086 - [compiler][null] include the effect of 'assert' in syntactic null analysis for fields
* bug 403147 - [compiler][null] FUP of bug 400761: consolidate interaction between unboxing, NPE, and deferred checking
* Jesper S Moller - Contributions for
* Bug 378674 - "The method can be declared as static" is wrong
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;
import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.eclipse.jdt.internal.compiler.codegen.CodeStream;
import org.eclipse.jdt.internal.compiler.codegen.Opcodes;
import org.eclipse.jdt.internal.compiler.flow.FlowContext;
import org.eclipse.jdt.internal.compiler.flow.FlowInfo;
import org.eclipse.jdt.internal.compiler.flow.UnconditionalFlowInfo;
import org.eclipse.jdt.internal.compiler.impl.CompilerOptions;
import org.eclipse.jdt.internal.compiler.impl.Constant;
import org.eclipse.jdt.internal.compiler.impl.ReferenceContext;
import org.eclipse.jdt.internal.compiler.lookup.Binding;
import org.eclipse.jdt.internal.compiler.lookup.BlockScope;
import org.eclipse.jdt.internal.compiler.lookup.ExtraCompilerModifiers;
import org.eclipse.jdt.internal.compiler.lookup.FieldBinding;
import org.eclipse.jdt.internal.compiler.lookup.InvocationSite;
import org.eclipse.jdt.internal.compiler.lookup.LocalVariableBinding;
import org.eclipse.jdt.internal.compiler.lookup.MethodBinding;
import org.eclipse.jdt.internal.compiler.lookup.MissingTypeBinding;
import org.eclipse.jdt.internal.compiler.lookup.ImplicitNullAnnotationVerifier;
import org.eclipse.jdt.internal.compiler.lookup.PolymorphicMethodBinding;
import org.eclipse.jdt.internal.compiler.lookup.ProblemMethodBinding;
import org.eclipse.jdt.internal.compiler.lookup.ProblemReasons;
import org.eclipse.jdt.internal.compiler.lookup.ProblemReferenceBinding;
import org.eclipse.jdt.internal.compiler.lookup.RawTypeBinding;
import org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding;
import org.eclipse.jdt.internal.compiler.lookup.Scope;
import org.eclipse.jdt.internal.compiler.lookup.SourceTypeBinding;
import org.eclipse.jdt.internal.compiler.lookup.TagBits;
import org.eclipse.jdt.internal.compiler.lookup.TypeBinding;
import org.eclipse.jdt.internal.compiler.lookup.TypeConstants;
import org.eclipse.jdt.internal.compiler.lookup.TypeIds;
import org.eclipse.jdt.internal.compiler.problem.ProblemSeverities;
public class MessageSend extends Expression implements InvocationSite {
public Expression receiver;
public char[] selector;
public Expression[] arguments;
public MethodBinding binding; // exact binding resulting from lookup
public MethodBinding syntheticAccessor; // synthetic accessor for inner-emulation
public TypeBinding expectedType; // for generic method invocation (return type inference)
public long nameSourcePosition ; //(start<<32)+end
public TypeBinding actualReceiverType;
public TypeBinding valueCast; // extra reference type cast to perform on method returned value
public TypeReference[] typeArguments;
public TypeBinding[] genericTypeArguments;
public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
boolean nonStatic = !this.binding.isStatic();
boolean wasInsideAssert = ((flowContext.tagBits & FlowContext.HIDE_NULL_COMPARISON_WARNING) != 0);
flowInfo = this.receiver.analyseCode(currentScope, flowContext, flowInfo, nonStatic).unconditionalInits();
// recording the closing of AutoCloseable resources:
boolean analyseResources = currentScope.compilerOptions().analyseResourceLeaks;
if (analyseResources) {
Expression closeTarget = null;
if (nonStatic) {
// closeable.close()
if (CharOperation.equals(TypeConstants.CLOSE, this.selector)) {
closeTarget = this.receiver;
}
} else if (this.arguments != null && this.arguments.length > 0 && FakedTrackingVariable.isAnyCloseable(this.arguments[0].resolvedType)) {
// Helper.closeMethod(closeable, ..)
for (int i=0; i<TypeConstants.closeMethods.length; i++) {
CloseMethodRecord record = TypeConstants.closeMethods[i];
if (CharOperation.equals(record.selector, this.selector)
&& CharOperation.equals(record.typeName, this.binding.declaringClass.compoundName))
{
closeTarget = this.arguments[0];
break;
}
}
}
if (closeTarget != null) {
FakedTrackingVariable trackingVariable = FakedTrackingVariable.getCloseTrackingVariable(closeTarget, flowInfo, flowContext);
if (trackingVariable != null) { // null happens if target is not a local variable or not an AutoCloseable
if (trackingVariable.methodScope == currentScope.methodScope()) {
trackingVariable.markClose(flowInfo, flowContext);
} else {
trackingVariable.markClosedInNestedMethod();
}
}
}
}
if (nonStatic) {
this.receiver.checkNPE(currentScope, flowContext, flowInfo);
}
if (this.arguments != null) {
int length = this.arguments.length;
for (int i = 0; i < length; i++) {
Expression argument = this.arguments[i];
argument.checkNPEbyUnboxing(currentScope, flowContext, flowInfo);
switch (detectAssertionUtility(i)) {
case TRUE_ASSERTION:
flowInfo = analyseBooleanAssertion(currentScope, argument, flowContext, flowInfo, wasInsideAssert, true);
break;
case FALSE_ASSERTION:
flowInfo = analyseBooleanAssertion(currentScope, argument, flowContext, flowInfo, wasInsideAssert, false);
break;
case NONNULL_ASSERTION:
flowInfo = analyseNullAssertion(currentScope, argument, flowContext, flowInfo, false);
break;
case NULL_ASSERTION:
flowInfo = analyseNullAssertion(currentScope, argument, flowContext, flowInfo, true);
break;
default:
flowInfo = argument.analyseCode(currentScope, flowContext, flowInfo).unconditionalInits();
}
if (analyseResources) {
// if argument is an AutoCloseable insert info that it *may* be closed (by the target method, i.e.)
flowInfo = FakedTrackingVariable.markPassedToOutside(currentScope, argument, flowInfo, flowContext, false);
}
}
analyseArguments(currentScope, flowContext, flowInfo, this.binding, this.arguments);
}
ReferenceBinding[] thrownExceptions;
if ((thrownExceptions = this.binding.thrownExceptions) != Binding.NO_EXCEPTIONS) {
if ((this.bits & ASTNode.Unchecked) != 0 && this.genericTypeArguments == null) {
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=277643, align with javac on JLS 15.12.2.6
thrownExceptions = currentScope.environment().convertToRawTypes(this.binding.thrownExceptions, true, true);
}
// must verify that exceptions potentially thrown by this expression are caught in the method
flowContext.checkExceptionHandlers(thrownExceptions, this, flowInfo.copy(), currentScope);
// TODO (maxime) the copy above is needed because of a side effect into
// checkExceptionHandlers; consider protecting there instead of here;
// NullReferenceTest#test0510
}
manageSyntheticAccessIfNecessary(currentScope, flowInfo);
// account for pot. exceptions thrown by method execution
flowContext.recordAbruptExit();
flowContext.expireNullCheckedFieldInfo(); // no longer trust this info after any message send
return flowInfo;
}
// classification of well-known assertion utilities:
private static final int TRUE_ASSERTION = 1;
private static final int FALSE_ASSERTION = 2;
private static final int NULL_ASSERTION = 3;
private static final int NONNULL_ASSERTION = 4;
// is the argument at the given position being checked by a well-known assertion utility?
// if so answer what kind of assertion we are facing.
private int detectAssertionUtility(int argumentIdx) {
TypeBinding[] parameters = this.binding.original().parameters;
if (argumentIdx < parameters.length) {
TypeBinding parameterType = parameters[argumentIdx];
if (this.actualReceiverType != null && parameterType != null) {
switch (this.actualReceiverType.id) {
case TypeIds.T_OrgEclipseCoreRuntimeAssert:
if (parameterType.id == TypeIds.T_boolean)
return TRUE_ASSERTION;
if (parameterType.id == TypeIds.T_JavaLangObject && CharOperation.equals(TypeConstants.IS_NOTNULL, this.selector))
return NONNULL_ASSERTION;
break;
case TypeIds.T_JunitFrameworkAssert:
case TypeIds.T_OrgJunitAssert:
if (parameterType.id == TypeIds.T_boolean) {
if (CharOperation.equals(TypeConstants.ASSERT_TRUE, this.selector))
return TRUE_ASSERTION;
if (CharOperation.equals(TypeConstants.ASSERT_FALSE, this.selector))
return FALSE_ASSERTION;
} else if (parameterType.id == TypeIds.T_JavaLangObject) {
if (CharOperation.equals(TypeConstants.ASSERT_NOTNULL, this.selector))
return NONNULL_ASSERTION;
if (CharOperation.equals(TypeConstants.ASSERT_NULL, this.selector))
return NULL_ASSERTION;
}
break;
case TypeIds.T_OrgApacheCommonsLangValidate:
if (parameterType.id == TypeIds.T_boolean) {
if (CharOperation.equals(TypeConstants.IS_TRUE, this.selector))
return TRUE_ASSERTION;
} else if (parameterType.id == TypeIds.T_JavaLangObject) {
if (CharOperation.equals(TypeConstants.NOT_NULL, this.selector))
return NONNULL_ASSERTION;
}
break;
case TypeIds.T_OrgApacheCommonsLang3Validate:
if (parameterType.id == TypeIds.T_boolean) {
if (CharOperation.equals(TypeConstants.IS_TRUE, this.selector))
return TRUE_ASSERTION;
} else if (parameterType.isTypeVariable()) {
if (CharOperation.equals(TypeConstants.NOT_NULL, this.selector))
return NONNULL_ASSERTION;
}
break;
case TypeIds.T_ComGoogleCommonBasePreconditions:
if (parameterType.id == TypeIds.T_boolean) {
if (CharOperation.equals(TypeConstants.CHECK_ARGUMENT, this.selector)
|| CharOperation.equals(TypeConstants.CHECK_STATE, this.selector))
return TRUE_ASSERTION;
} else if (parameterType.isTypeVariable()) {
if (CharOperation.equals(TypeConstants.CHECK_NOT_NULL, this.selector))
return NONNULL_ASSERTION;
}
break;
case TypeIds.T_JavaUtilObjects:
if (parameterType.isTypeVariable()) {
if (CharOperation.equals(TypeConstants.REQUIRE_NON_NULL, this.selector))
return NONNULL_ASSERTION;
}
break;
}
}
}
return 0;
}
private FlowInfo analyseBooleanAssertion(BlockScope currentScope, Expression argument,
FlowContext flowContext, FlowInfo flowInfo, boolean wasInsideAssert, boolean passOnTrue)
{
Constant cst = argument.optimizedBooleanConstant();
boolean isOptimizedTrueAssertion = cst != Constant.NotAConstant && cst.booleanValue() == true;
boolean isOptimizedFalseAssertion = cst != Constant.NotAConstant && cst.booleanValue() == false;
int tagBitsSave = flowContext.tagBits;
flowContext.tagBits |= FlowContext.HIDE_NULL_COMPARISON_WARNING;
if (!passOnTrue)
flowContext.tagBits |= FlowContext.INSIDE_NEGATION; // this affects syntactic analysis for fields in EqualExpression
FlowInfo conditionFlowInfo = argument.analyseCode(currentScope, flowContext, flowInfo.copy());
flowContext.extendTimeToLiveForNullCheckedField(2); // survive this assert as a MessageSend and as a Statement
flowContext.tagBits = tagBitsSave;
UnconditionalFlowInfo assertWhenPassInfo;
FlowInfo assertWhenFailInfo;
boolean isOptimizedPassing;
boolean isOptimizedFailing;
if (passOnTrue) {
assertWhenPassInfo = conditionFlowInfo.initsWhenTrue().unconditionalInits();
assertWhenFailInfo = conditionFlowInfo.initsWhenFalse();
isOptimizedPassing = isOptimizedTrueAssertion;
isOptimizedFailing = isOptimizedFalseAssertion;
} else {
assertWhenPassInfo = conditionFlowInfo.initsWhenFalse().unconditionalInits();
assertWhenFailInfo = conditionFlowInfo.initsWhenTrue();
isOptimizedPassing = isOptimizedFalseAssertion;
isOptimizedFailing = isOptimizedTrueAssertion;
}
if (isOptimizedPassing) {
assertWhenFailInfo.setReachMode(FlowInfo.UNREACHABLE_OR_DEAD);
}
if (!isOptimizedFailing) {
// if assertion is not failing for sure, only then it makes sense to carry the flow info ahead.
// if the code does reach ahead, it means the assert didn't cause an exit, and so
// the expression inside it shouldn't change the prior flowinfo
// viz. org.eclipse.core.runtime.Assert.isLegal(false && o != null)
// keep the merge from the initial code for the definite assignment
// analysis, tweak the null part to influence nulls downstream
flowInfo = flowInfo.mergedWith(assertWhenFailInfo.nullInfoLessUnconditionalCopy()).
addInitializationsFrom(assertWhenPassInfo.discardInitializationInfo());
}
return flowInfo;
}
private FlowInfo analyseNullAssertion(BlockScope currentScope, Expression argument,
FlowContext flowContext, FlowInfo flowInfo, boolean expectingNull)
{
int nullStatus = argument.nullStatus(flowInfo, flowContext);
boolean willFail = (nullStatus == (expectingNull ? FlowInfo.NON_NULL : FlowInfo.NULL));
flowInfo = argument.analyseCode(currentScope, flowContext, flowInfo).unconditionalInits();
LocalVariableBinding local = argument.localVariableBinding();
if (local != null) {// beyond this point the argument can only be null/nonnull
if (expectingNull)
flowInfo.markAsDefinitelyNull(local);
else
flowInfo.markAsDefinitelyNonNull(local);
} else {
if (!expectingNull
&& argument instanceof Reference
&& currentScope.compilerOptions().enableSyntacticNullAnalysisForFields)
{
FieldBinding field = ((Reference)argument).lastFieldBinding();
if (field != null && (field.type.tagBits & TagBits.IsBaseType) == 0) {
flowContext.recordNullCheckedFieldReference((Reference) argument, 3); // survive this assert as a MessageSend and as a Statement
}
}
}
if (willFail)
flowInfo.setReachMode(FlowInfo.UNREACHABLE_BY_NULLANALYSIS);
return flowInfo;
}
public boolean checkNPE(BlockScope scope, FlowContext flowContext, FlowInfo flowInfo) {
// message send as a receiver
if ((nullStatus(flowInfo, flowContext) & FlowInfo.POTENTIALLY_NULL) != 0)
scope.problemReporter().messageSendPotentialNullReference(this.binding, this);
return true; // done all possible checking
}
/**
* @see org.eclipse.jdt.internal.compiler.ast.Expression#computeConversion(org.eclipse.jdt.internal.compiler.lookup.Scope, org.eclipse.jdt.internal.compiler.lookup.TypeBinding, org.eclipse.jdt.internal.compiler.lookup.TypeBinding)
*/
public void computeConversion(Scope scope, TypeBinding runtimeTimeType, TypeBinding compileTimeType) {
if (runtimeTimeType == null || compileTimeType == null)
return;
// set the generic cast after the fact, once the type expectation is fully known (no need for strict cast)
if (this.binding != null && this.binding.isValidBinding()) {
MethodBinding originalBinding = this.binding.original();
TypeBinding originalType = originalBinding.returnType;
// extra cast needed if method return type is type variable
if (originalType.leafComponentType().isTypeVariable()) {
TypeBinding targetType = (!compileTimeType.isBaseType() && runtimeTimeType.isBaseType())
? compileTimeType // unboxing: checkcast before conversion
: runtimeTimeType;
this.valueCast = originalType.genericCast(targetType);
} else if (this.binding == scope.environment().arrayClone
&& runtimeTimeType.id != TypeIds.T_JavaLangObject
&& scope.compilerOptions().sourceLevel >= ClassFileConstants.JDK1_5) {
// from 1.5 source level on, array#clone() resolves to array type, but codegen to #clone()Object - thus require extra inserted cast
this.valueCast = runtimeTimeType;
}
if (this.valueCast instanceof ReferenceBinding) {
ReferenceBinding referenceCast = (ReferenceBinding) this.valueCast;
if (!referenceCast.canBeSeenBy(scope)) {
scope.problemReporter().invalidType(this,
new ProblemReferenceBinding(
CharOperation.splitOn('.', referenceCast.shortReadableName()),
referenceCast,
ProblemReasons.NotVisible));
}
}
}
super.computeConversion(scope, runtimeTimeType, compileTimeType);
}
/**
* MessageSend code generation
*
* @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
* @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
* @param valueRequired boolean
*/
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
int pc = codeStream.position;
// generate receiver/enclosing instance access
MethodBinding codegenBinding = this.binding instanceof PolymorphicMethodBinding ? this.binding : this.binding.original();
boolean isStatic = codegenBinding.isStatic();
if (isStatic) {
this.receiver.generateCode(currentScope, codeStream, false);
} else if ((this.bits & ASTNode.DepthMASK) != 0 && this.receiver.isImplicitThis()) { // outer access ?
// outer method can be reached through emulation if implicit access
ReferenceBinding targetType = currentScope.enclosingSourceType().enclosingTypeAt((this.bits & ASTNode.DepthMASK) >> ASTNode.DepthSHIFT);
Object[] path = currentScope.getEmulationPath(targetType, true /*only exact match*/, false/*consider enclosing arg*/);
codeStream.generateOuterAccess(path, this, targetType, currentScope);
} else {
this.receiver.generateCode(currentScope, codeStream, true);
if ((this.bits & NeedReceiverGenericCast) != 0) {
codeStream.checkcast(this.actualReceiverType);
}
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
// generate arguments
generateArguments(this.binding, this.arguments, currentScope, codeStream);
pc = codeStream.position;
// actual message invocation
if (this.syntheticAccessor == null){
TypeBinding constantPoolDeclaringClass = CodeStream.getConstantPoolDeclaringClass(currentScope, codegenBinding, this.actualReceiverType, this.receiver.isImplicitThis());
if (isStatic){
codeStream.invoke(Opcodes.OPC_invokestatic, codegenBinding, constantPoolDeclaringClass);
} else if((this.receiver.isSuper()) || codegenBinding.isPrivate()){
codeStream.invoke(Opcodes.OPC_invokespecial, codegenBinding, constantPoolDeclaringClass);
} else if (constantPoolDeclaringClass.isInterface()) { // interface or annotation type
codeStream.invoke(Opcodes.OPC_invokeinterface, codegenBinding, constantPoolDeclaringClass);
} else {
codeStream.invoke(Opcodes.OPC_invokevirtual, codegenBinding, constantPoolDeclaringClass);
}
} else {
codeStream.invoke(Opcodes.OPC_invokestatic, this.syntheticAccessor, null /* default declaringClass */);
}
// required cast must occur even if no value is required
if (this.valueCast != null) codeStream.checkcast(this.valueCast);
if (valueRequired){
// implicit conversion if necessary
codeStream.generateImplicitConversion(this.implicitConversion);
} else {
boolean isUnboxing = (this.implicitConversion & TypeIds.UNBOXING) != 0;
// conversion only generated if unboxing
if (isUnboxing) codeStream.generateImplicitConversion(this.implicitConversion);
switch (isUnboxing ? postConversionType(currentScope).id : codegenBinding.returnType.id) {
case T_long :
case T_double :
codeStream.pop2();
break;
case T_void :
break;
default :
codeStream.pop();
}
}
codeStream.recordPositionsFrom(pc, (int)(this.nameSourcePosition >>> 32)); // highlight selector
}
/**
* @see org.eclipse.jdt.internal.compiler.lookup.InvocationSite#genericTypeArguments()
*/
public TypeBinding[] genericTypeArguments() {
return this.genericTypeArguments;
}
public boolean isSuperAccess() {
return this.receiver.isSuper();
}
public boolean isTypeAccess() {
return this.receiver != null && this.receiver.isTypeReference();
}
public void manageSyntheticAccessIfNecessary(BlockScope currentScope, FlowInfo flowInfo){
if ((flowInfo.tagBits & FlowInfo.UNREACHABLE_OR_DEAD) != 0) return;
// if method from parameterized type got found, use the original method at codegen time
MethodBinding codegenBinding = this.binding.original();
if (this.binding.isPrivate()){
// depth is set for both implicit and explicit access (see MethodBinding#canBeSeenBy)
if (currentScope.enclosingSourceType() != codegenBinding.declaringClass){
this.syntheticAccessor = ((SourceTypeBinding)codegenBinding.declaringClass).addSyntheticMethod(codegenBinding, false /* not super access there */);
currentScope.problemReporter().needToEmulateMethodAccess(codegenBinding, this);
return;
}
} else if (this.receiver instanceof QualifiedSuperReference){ // qualified super
// qualified super need emulation always
SourceTypeBinding destinationType = (SourceTypeBinding)(((QualifiedSuperReference)this.receiver).currentCompatibleType);
this.syntheticAccessor = destinationType.addSyntheticMethod(codegenBinding, isSuperAccess());
currentScope.problemReporter().needToEmulateMethodAccess(codegenBinding, this);
return;
} else if (this.binding.isProtected()){
SourceTypeBinding enclosingSourceType;
if (((this.bits & ASTNode.DepthMASK) != 0)
&& codegenBinding.declaringClass.getPackage()
!= (enclosingSourceType = currentScope.enclosingSourceType()).getPackage()){
SourceTypeBinding currentCompatibleType = (SourceTypeBinding)enclosingSourceType.enclosingTypeAt((this.bits & ASTNode.DepthMASK) >> ASTNode.DepthSHIFT);
this.syntheticAccessor = currentCompatibleType.addSyntheticMethod(codegenBinding, isSuperAccess());
currentScope.problemReporter().needToEmulateMethodAccess(codegenBinding, this);
return;
}
}
}
public int nullStatus(FlowInfo flowInfo, FlowContext flowContext) {
if (this.binding.isValidBinding()) {
// try to retrieve null status of this message send from an annotation of the called method:
long tagBits = this.binding.tagBits;
if ((tagBits & TagBits.AnnotationNonNull) != 0)
return FlowInfo.NON_NULL;
if ((tagBits & TagBits.AnnotationNullable) != 0)
return FlowInfo.POTENTIALLY_NULL | FlowInfo.POTENTIALLY_NON_NULL;
}
return FlowInfo.UNKNOWN;
}
/**
* @see org.eclipse.jdt.internal.compiler.ast.Expression#postConversionType(Scope)
*/
public TypeBinding postConversionType(Scope scope) {
TypeBinding convertedType = this.resolvedType;
if (this.valueCast != null)
convertedType = this.valueCast;
int runtimeType = (this.implicitConversion & TypeIds.IMPLICIT_CONVERSION_MASK) >> 4;
switch (runtimeType) {
case T_boolean :
convertedType = TypeBinding.BOOLEAN;
break;
case T_byte :
convertedType = TypeBinding.BYTE;
break;
case T_short :
convertedType = TypeBinding.SHORT;
break;
case T_char :
convertedType = TypeBinding.CHAR;
break;
case T_int :
convertedType = TypeBinding.INT;
break;
case T_float :
convertedType = TypeBinding.FLOAT;
break;
case T_long :
convertedType = TypeBinding.LONG;
break;
case T_double :
convertedType = TypeBinding.DOUBLE;
break;
default :
}
if ((this.implicitConversion & TypeIds.BOXING) != 0) {
convertedType = scope.environment().computeBoxingType(convertedType);
}
return convertedType;
}
public StringBuffer printExpression(int indent, StringBuffer output){
if (!this.receiver.isImplicitThis()) this.receiver.printExpression(0, output).append('.');
if (this.typeArguments != null) {
output.append('<');
int max = this.typeArguments.length - 1;
for (int j = 0; j < max; j++) {
this.typeArguments[j].print(0, output);
output.append(", ");//$NON-NLS-1$
}
this.typeArguments[max].print(0, output);
output.append('>');
}
output.append(this.selector).append('(') ;
if (this.arguments != null) {
for (int i = 0; i < this.arguments.length ; i ++) {
if (i > 0) output.append(", "); //$NON-NLS-1$
this.arguments[i].printExpression(0, output);
}
}
return output.append(')');
}
public TypeBinding resolveType(BlockScope scope) {
// Answer the signature return type
// Base type promotion
this.constant = Constant.NotAConstant;
boolean receiverCast = false, argsContainCast = false;
if (this.receiver instanceof CastExpression) {
this.receiver.bits |= ASTNode.DisableUnnecessaryCastCheck; // will check later on
receiverCast = true;
}
this.actualReceiverType = this.receiver.resolveType(scope);
boolean receiverIsType = this.receiver instanceof NameReference && (((NameReference) this.receiver).bits & Binding.TYPE) != 0;
if (receiverCast && this.actualReceiverType != null) {
// due to change of declaring class with receiver type, only identity cast should be notified
if (((CastExpression)this.receiver).expression.resolvedType == this.actualReceiverType) {
scope.problemReporter().unnecessaryCast((CastExpression)this.receiver);
}
}
// resolve type arguments (for generic constructor call)
if (this.typeArguments != null) {
int length = this.typeArguments.length;
boolean argHasError = scope.compilerOptions().sourceLevel < ClassFileConstants.JDK1_5; // typeChecks all arguments
this.genericTypeArguments = new TypeBinding[length];
for (int i = 0; i < length; i++) {
TypeReference typeReference = this.typeArguments[i];
if ((this.genericTypeArguments[i] = typeReference.resolveType(scope, true /* check bounds*/)) == null) {
argHasError = true;
}
if (argHasError && typeReference instanceof Wildcard) {
scope.problemReporter().illegalUsageOfWildcard(typeReference);
}
}
if (argHasError) {
if (this.arguments != null) { // still attempt to resolve arguments
for (int i = 0, max = this.arguments.length; i < max; i++) {
this.arguments[i].resolveType(scope);
}
}
return null;
}
}
// will check for null after args are resolved
TypeBinding[] argumentTypes = Binding.NO_PARAMETERS;
if (this.arguments != null) {
boolean argHasError = false; // typeChecks all arguments
int length = this.arguments.length;
argumentTypes = new TypeBinding[length];
for (int i = 0; i < length; i++){
Expression argument = this.arguments[i];
if (argument instanceof CastExpression) {
argument.bits |= ASTNode.DisableUnnecessaryCastCheck; // will check later on
argsContainCast = true;
}
if ((argumentTypes[i] = argument.resolveType(scope)) == null){
argHasError = true;
}
}
if (argHasError) {
if (this.actualReceiverType instanceof ReferenceBinding) {
// record a best guess, for clients who need hint about possible method match
TypeBinding[] pseudoArgs = new TypeBinding[length];
for (int i = length; --i >= 0;)
pseudoArgs[i] = argumentTypes[i] == null ? TypeBinding.NULL : argumentTypes[i]; // replace args with errors with null type
this.binding =
this.receiver.isImplicitThis()
? scope.getImplicitMethod(this.selector, pseudoArgs, this)
: scope.findMethod((ReferenceBinding) this.actualReceiverType, this.selector, pseudoArgs, this);
if (this.binding != null && !this.binding.isValidBinding()) {
MethodBinding closestMatch = ((ProblemMethodBinding)this.binding).closestMatch;
// record the closest match, for clients who may still need hint about possible method match
if (closestMatch != null) {
if (closestMatch.original().typeVariables != Binding.NO_TYPE_VARIABLES) { // generic method
// shouldn't return generic method outside its context, rather convert it to raw method (175409)
closestMatch = scope.environment().createParameterizedGenericMethod(closestMatch.original(), (RawTypeBinding)null);
}
this.binding = closestMatch;
MethodBinding closestMatchOriginal = closestMatch.original();
if (closestMatchOriginal.isOrEnclosedByPrivateType() && !scope.isDefinedInMethod(closestMatchOriginal)) {
// ignore cases where method is used from within inside itself (e.g. direct recursions)
closestMatchOriginal.modifiers |= ExtraCompilerModifiers.AccLocallyUsed;
}
}
}
}
return null;
}
}
if (this.actualReceiverType == null) {
return null;
}
// base type cannot receive any message
if (this.actualReceiverType.isBaseType()) {
scope.problemReporter().errorNoMethodFor(this, this.actualReceiverType, argumentTypes);
return null;
}
this.binding = this.receiver.isImplicitThis()
? scope.getImplicitMethod(this.selector, argumentTypes, this)
: scope.getMethod(this.actualReceiverType, this.selector, argumentTypes, this);
if (!this.binding.isValidBinding()) {
if (this.binding.declaringClass == null) {
if (this.actualReceiverType instanceof ReferenceBinding) {
this.binding.declaringClass = (ReferenceBinding) this.actualReceiverType;
} else {
scope.problemReporter().errorNoMethodFor(this, this.actualReceiverType, argumentTypes);
return null;
}
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=245007 avoid secondary errors in case of
// missing super type for anonymous classes ...
ReferenceBinding declaringClass = this.binding.declaringClass;
boolean avoidSecondary = declaringClass != null &&
declaringClass.isAnonymousType() &&
declaringClass.superclass() instanceof MissingTypeBinding;
if (!avoidSecondary)
scope.problemReporter().invalidMethod(this, this.binding);
MethodBinding closestMatch = ((ProblemMethodBinding)this.binding).closestMatch;
switch (this.binding.problemId()) {
case ProblemReasons.Ambiguous :
break; // no resilience on ambiguous
case ProblemReasons.NotVisible :
case ProblemReasons.NonStaticReferenceInConstructorInvocation :
case ProblemReasons.NonStaticReferenceInStaticContext :
case ProblemReasons.ReceiverTypeNotVisible :
case ProblemReasons.ParameterBoundMismatch :
// only steal returnType in cases listed above
if (closestMatch != null) this.resolvedType = closestMatch.returnType;
break;
}
// record the closest match, for clients who may still need hint about possible method match
if (closestMatch != null) {
this.binding = closestMatch;
MethodBinding closestMatchOriginal = closestMatch.original();
if (closestMatchOriginal.isOrEnclosedByPrivateType() && !scope.isDefinedInMethod(closestMatchOriginal)) {
// ignore cases where method is used from within inside itself (e.g. direct recursions)
closestMatchOriginal.modifiers |= ExtraCompilerModifiers.AccLocallyUsed;
}
}
return (this.resolvedType != null && (this.resolvedType.tagBits & TagBits.HasMissingType) == 0)
? this.resolvedType
: null;
}
final CompilerOptions compilerOptions = scope.compilerOptions();
if (compilerOptions.complianceLevel <= ClassFileConstants.JDK1_6
&& this.binding.isPolymorphic()) {
scope.problemReporter().polymorphicMethodNotBelow17(this);
return null;
}
if (compilerOptions.isAnnotationBasedNullAnalysisEnabled && (this.binding.tagBits & TagBits.IsNullnessKnown) == 0) {
// not interested in reporting problems against this.binding:
new ImplicitNullAnnotationVerifier(compilerOptions.inheritNullAnnotations)
.checkImplicitNullAnnotations(this.binding, null/*srcMethod*/, false, scope);
}
if (((this.bits & ASTNode.InsideExpressionStatement) != 0)
&& this.binding.isPolymorphic()) {
// we only set the return type to be void if this method invocation is used inside an expression statement
this.binding = scope.environment().updatePolymorphicMethodReturnType((PolymorphicMethodBinding) this.binding, TypeBinding.VOID);
}
if ((this.binding.tagBits & TagBits.HasMissingType) != 0) {
scope.problemReporter().missingTypeInMethod(this, this.binding);
}
if (!this.binding.isStatic()) {
// the "receiver" must not be a type
if (receiverIsType) {
scope.problemReporter().mustUseAStaticMethod(this, this.binding);
if (this.actualReceiverType.isRawType()
&& (this.receiver.bits & ASTNode.IgnoreRawTypeCheck) == 0
&& compilerOptions.getSeverity(CompilerOptions.RawTypeReference) != ProblemSeverities.Ignore) {
scope.problemReporter().rawTypeReference(this.receiver, this.actualReceiverType);
}
} else {
// handle indirect inheritance thru variable secondary bound
// receiver may receive generic cast, as part of implicit conversion
TypeBinding oldReceiverType = this.actualReceiverType;
this.actualReceiverType = this.actualReceiverType.getErasureCompatibleType(this.binding.declaringClass);
this.receiver.computeConversion(scope, this.actualReceiverType, this.actualReceiverType);
if (this.actualReceiverType != oldReceiverType && this.receiver.postConversionType(scope) != this.actualReceiverType) { // record need for explicit cast at codegen since receiver could not handle it
this.bits |= NeedReceiverGenericCast;
}
}
} else {
// static message invoked through receiver? legal but unoptimal (optional warning).
if (!(this.receiver.isImplicitThis() || this.receiver.isSuper() || receiverIsType)) {
scope.problemReporter().nonStaticAccessToStaticMethod(this, this.binding);
}
if (!this.receiver.isImplicitThis() && this.binding.declaringClass != this.actualReceiverType) {
scope.problemReporter().indirectAccessToStaticMethod(this, this.binding);
}
}
if (checkInvocationArguments(scope, this.receiver, this.actualReceiverType, this.binding, this.arguments, argumentTypes, argsContainCast, this)) {
this.bits |= ASTNode.Unchecked;
}
//-------message send that are known to fail at compile time-----------
if (this.binding.isAbstract()) {
if (this.receiver.isSuper()) {
scope.problemReporter().cannotDireclyInvokeAbstractMethod(this, this.binding);
}
// abstract private methods cannot occur nor abstract static............
}
if (isMethodUseDeprecated(this.binding, scope, true))
scope.problemReporter().deprecatedMethod(this.binding, this);
// from 1.5 source level on, array#clone() returns the array type (but binding still shows Object)
if (this.binding == scope.environment().arrayClone && compilerOptions.sourceLevel >= ClassFileConstants.JDK1_5) {
this.resolvedType = this.actualReceiverType;
} else {
TypeBinding returnType;
if ((this.bits & ASTNode.Unchecked) != 0 && this.genericTypeArguments == null) {
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=277643, align with javac on JLS 15.12.2.6
returnType = this.binding.returnType;
if (returnType != null) {
returnType = scope.environment().convertToRawType(returnType.erasure(), true);
}
} else {
returnType = this.binding.returnType;
if (returnType != null) {
returnType = returnType.capture(scope, this.sourceEnd);
}
}
this.resolvedType = returnType;
}
if (this.receiver.isSuper() && compilerOptions.getSeverity(CompilerOptions.OverridingMethodWithoutSuperInvocation) != ProblemSeverities.Ignore) {
final ReferenceContext referenceContext = scope.methodScope().referenceContext;
if (referenceContext instanceof AbstractMethodDeclaration) {
final AbstractMethodDeclaration abstractMethodDeclaration = (AbstractMethodDeclaration) referenceContext;
MethodBinding enclosingMethodBinding = abstractMethodDeclaration.binding;
if (enclosingMethodBinding.isOverriding()
&& CharOperation.equals(this.binding.selector, enclosingMethodBinding.selector)
&& this.binding.areParametersEqual(enclosingMethodBinding)) {
abstractMethodDeclaration.bits |= ASTNode.OverridingMethodWithSupercall;
}
}
}
if (this.typeArguments != null && this.binding.original().typeVariables == Binding.NO_TYPE_VARIABLES) {
scope.problemReporter().unnecessaryTypeArgumentsForMethodInvocation(this.binding, this.genericTypeArguments, this.typeArguments);
}
return (this.resolvedType.tagBits & TagBits.HasMissingType) == 0
? this.resolvedType
: null;
}
public void setActualReceiverType(ReferenceBinding receiverType) {
if (receiverType == null) return; // error scenario only
this.actualReceiverType = receiverType;
}
public void setDepth(int depth) {
this.bits &= ~ASTNode.DepthMASK; // flush previous depth if any
if (depth > 0) {
this.bits |= (depth & 0xFF) << ASTNode.DepthSHIFT; // encoded on 8 bits
}
}
/**
* @see org.eclipse.jdt.internal.compiler.ast.Expression#setExpectedType(org.eclipse.jdt.internal.compiler.lookup.TypeBinding)
*/
public void setExpectedType(TypeBinding expectedType) {
this.expectedType = expectedType;
}
public void setFieldIndex(int depth) {
// ignore for here
}
public TypeBinding expectedType() {
return this.expectedType;
}
public void traverse(ASTVisitor visitor, BlockScope blockScope) {
if (visitor.visit(this, blockScope)) {
this.receiver.traverse(visitor, blockScope);
if (this.typeArguments != null) {
for (int i = 0, typeArgumentsLength = this.typeArguments.length; i < typeArgumentsLength; i++) {
this.typeArguments[i].traverse(visitor, blockScope);
}
}
if (this.arguments != null) {
int argumentsLength = this.arguments.length;
for (int i = 0; i < argumentsLength; i++)
this.arguments[i].traverse(visitor, blockScope);
}
}
visitor.endVisit(this, blockScope);
}
}