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Eclipse Compiler for Java(TM)
/*******************************************************************************
* Copyright (c) 2000, 2020 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
* Stephan Herrmann - Contributions for
* bug 319201 - [null] no warning when unboxing SingleNameReference causes NPE
* bug 345305 - [compiler][null] Compiler misidentifies a case of "variable can only be null"
* bug 403147 - [compiler][null] FUP of bug 400761: consolidate interaction between unboxing, NPE, and deferred checking
* Bug 417758 - [1.8][null] Null safety compromise during array creation.
* Bug 427163 - [1.8][null] bogus error "Contradictory null specification" on varags
* Andy Clement (GoPivotal, Inc) [email protected] - Contributions for
* Bug 383624 - [1.8][compiler] Revive code generation support for type annotations (from Olivier's work)
* Bug 409247 - [1.8][compiler] Verify error with code allocating multidimensional array
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;
import java.util.List;
import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.impl.*;
import org.eclipse.jdt.internal.compiler.ast.TypeReference.AnnotationCollector;
import org.eclipse.jdt.internal.compiler.codegen.*;
import org.eclipse.jdt.internal.compiler.flow.*;
import org.eclipse.jdt.internal.compiler.lookup.*;
public class ArrayAllocationExpression extends Expression {
public TypeReference type;
//dimensions.length gives the number of dimensions, but the
// last ones may be nulled as in new int[4][5][][]
public Expression[] dimensions;
public Annotation [][] annotationsOnDimensions; // jsr308 style annotations.
public ArrayInitializer initializer;
@Override
public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
for (int i = 0, max = this.dimensions.length; i < max; i++) {
Expression dim;
if ((dim = this.dimensions[i]) != null) {
flowInfo = dim.analyseCode(currentScope, flowContext, flowInfo);
dim.checkNPEbyUnboxing(currentScope, flowContext, flowInfo);
}
}
// account for potential OutOfMemoryError:
flowContext.recordAbruptExit();
if (this.initializer != null) {
return this.initializer.analyseCode(currentScope, flowContext, flowInfo);
}
return flowInfo;
}
/**
* Code generation for a array allocation expression
*/
@Override
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
int pc = codeStream.position;
if (this.initializer != null) {
this.initializer.generateCode(this.type, this, currentScope, codeStream, valueRequired);
return;
}
int explicitDimCount = 0;
for (int i = 0, max = this.dimensions.length; i < max; i++) {
Expression dimExpression;
if ((dimExpression = this.dimensions[i]) == null) break; // implicit dim, no further explict after this point
dimExpression.generateCode(currentScope, codeStream, true);
explicitDimCount++;
}
// array allocation
if (explicitDimCount == 1) {
// Mono-dimensional array
codeStream.newArray(this.type, this, (ArrayBinding)this.resolvedType);
} else {
// Multi-dimensional array
codeStream.multianewarray(this.type, this.resolvedType, explicitDimCount, this);
}
if (valueRequired) {
codeStream.generateImplicitConversion(this.implicitConversion);
} else {
codeStream.pop();
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
}
@Override
public StringBuffer printExpression(int indent, StringBuffer output) {
output.append("new "); //$NON-NLS-1$
this.type.print(0, output);
for (int i = 0; i < this.dimensions.length; i++) {
if (this.annotationsOnDimensions != null && this.annotationsOnDimensions[i] != null) {
output.append(' ');
printAnnotations(this.annotationsOnDimensions[i], output);
output.append(' ');
}
if (this.dimensions[i] == null)
output.append("[]"); //$NON-NLS-1$
else {
output.append('[');
this.dimensions[i].printExpression(0, output);
output.append(']');
}
}
if (this.initializer != null) this.initializer.printExpression(0, output);
return output;
}
@Override
public TypeBinding resolveType(BlockScope scope) {
// Build an array type reference using the current dimensions
// The parser does not check for the fact that dimension may be null
// only at the -end- like new int [4][][]. The parser allows new int[][4][]
// so this must be checked here......(this comes from a reduction to LL1 grammar)
TypeBinding referenceType = this.type.resolveType(scope, true /* check bounds*/);
// will check for null after dimensions are checked
this.constant = Constant.NotAConstant;
if (referenceType == TypeBinding.VOID) {
scope.problemReporter().cannotAllocateVoidArray(this);
referenceType = null;
}
// check the validity of the dimension syntax (and test for all null dimensions)
int explicitDimIndex = -1;
loop: for (int i = this.dimensions.length; --i >= 0;) {
if (this.dimensions[i] != null) {
if (explicitDimIndex < 0) explicitDimIndex = i;
} else if (explicitDimIndex > 0) {
// should not have an empty dimension before an non-empty one
scope.problemReporter().incorrectLocationForNonEmptyDimension(this, explicitDimIndex);
break loop;
}
}
// explicitDimIndex < 0 says if all dimensions are nulled
// when an initializer is given, no dimension must be specified
if (this.initializer == null) {
if (explicitDimIndex < 0) {
scope.problemReporter().mustDefineDimensionsOrInitializer(this);
}
// allow new List[5] - only check for generic array when no initializer, since also checked inside initializer resolution
if (referenceType != null && !referenceType.isReifiable()) {
scope.problemReporter().illegalGenericArray(referenceType, this);
}
} else if (explicitDimIndex >= 0) {
scope.problemReporter().cannotDefineDimensionsAndInitializer(this);
}
// dimensions resolution
for (int i = 0; i <= explicitDimIndex; i++) {
Expression dimExpression;
if ((dimExpression = this.dimensions[i]) != null) {
TypeBinding dimensionType = dimExpression.resolveTypeExpecting(scope, TypeBinding.INT);
if (dimensionType != null) {
this.dimensions[i].computeConversion(scope, TypeBinding.INT, dimensionType);
}
}
}
// building the array binding
if (referenceType != null) {
if (this.dimensions.length > 255) {
scope.problemReporter().tooManyDimensions(this);
}
if (this.type.annotations != null
&& (referenceType.tagBits & TagBits.AnnotationNullMASK) == TagBits.AnnotationNullMASK)
{
scope.problemReporter().contradictoryNullAnnotations(this.type.annotations[this.type.annotations.length-1]);
referenceType = referenceType.withoutToplevelNullAnnotation();
}
this.resolvedType = scope.createArrayType(referenceType, this.dimensions.length);
int lastInitializedDim = -1;
long[] nullTagBitsPerDimension = null;
if (this.annotationsOnDimensions != null) {
this.resolvedType = resolveAnnotations(scope, this.annotationsOnDimensions, this.resolvedType);
nullTagBitsPerDimension = ((ArrayBinding)this.resolvedType).nullTagBitsPerDimension;
if (nullTagBitsPerDimension != null) {
for (int i = 0; i < this.annotationsOnDimensions.length; i++) {
if ((nullTagBitsPerDimension[i] & TagBits.AnnotationNullMASK) == TagBits.AnnotationNullMASK) {
scope.problemReporter().contradictoryNullAnnotations(this.annotationsOnDimensions[i]);
nullTagBitsPerDimension[i] = 0;
}
if (this.dimensions[i] != null) {
lastInitializedDim = i;
}
}
}
}
if (this.initializer != null) {
this.resolvedType = ArrayTypeReference.maybeMarkArrayContentsNonNull(scope, this.resolvedType, this.sourceStart, this.dimensions.length, null);
if ((this.initializer.resolveTypeExpecting(scope, this.resolvedType)) != null)
this.initializer.binding = (ArrayBinding)this.resolvedType;
} else {
// check uninitialized cells declared @NonNull inside the last initialized dimension
if (lastInitializedDim != -1 && nullTagBitsPerDimension != null) {
checkUninitializedNonNullArrayContents(scope, nullTagBitsPerDimension[lastInitializedDim+1], lastInitializedDim);
}
}
if ((referenceType.tagBits & TagBits.HasMissingType) != 0) {
return null;
}
}
return this.resolvedType;
}
protected void checkUninitializedNonNullArrayContents(BlockScope scope, long elementNullTagBits, int lastDim) {
if ((elementNullTagBits & TagBits.AnnotationNonNull) == 0)
return; // next element type admits 'null' entries
if (this.dimensions[lastDim] instanceof IntLiteral) {
Constant intConstant = ((IntLiteral) this.dimensions[lastDim]).constant;
if (intConstant.intValue() == 0)
return; // last dimension [0] implies no 'null' entries
}
TypeBinding elementType = this.resolvedType;
for (int i=0; i allTypeAnnotationContexts) {
AnnotationCollector collector = new AnnotationCollector(this, targetType, info, allTypeAnnotationContexts);
this.type.traverse(collector, (BlockScope) null);
if (this.annotationsOnDimensions != null) {
int dimensionsLength = this.dimensions.length;
for (int i = 0; i < dimensionsLength; i++) {
Annotation [] annotations = this.annotationsOnDimensions[i];
int annotationsLength = annotations == null ? 0 : annotations.length;
for (int j = 0; j < annotationsLength; j++) {
annotations[j].traverse(collector, (BlockScope) null);
}
}
}
}
public Annotation[][] getAnnotationsOnDimensions() {
return this.annotationsOnDimensions;
}
}