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/*******************************************************************************
* Copyright (c) 2021, 2022 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
*******************************************************************************/
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.BranchLabel;
import org.eclipse.jdt.internal.compiler.codegen.CodeStream;
import org.eclipse.jdt.internal.compiler.flow.FlowContext;
import org.eclipse.jdt.internal.compiler.flow.FlowInfo;
import org.eclipse.jdt.internal.compiler.impl.Constant;
import org.eclipse.jdt.internal.compiler.lookup.BlockScope;
import org.eclipse.jdt.internal.compiler.lookup.ExtraCompilerModifiers;
import org.eclipse.jdt.internal.compiler.lookup.LocalVariableBinding;
import org.eclipse.jdt.internal.compiler.lookup.Scope;
import org.eclipse.jdt.internal.compiler.lookup.TypeBinding;
public class TypePattern extends Pattern {
public LocalDeclaration local;
Expression expression;
public TypePattern(LocalDeclaration local) {
this.local = local;
}
protected TypePattern() {
}
@Override
public TypeReference getType() {
return this.local.type;
}
@Override
public void collectPatternVariablesToScope(LocalVariableBinding[] variables, BlockScope scope) {
if (this.resolvedType == null) {
this.resolveType(scope);
}
if (this.local != null && this.local.binding != null) {
LocalVariableBinding binding = this.local.binding;
if (variables != null) {
for (LocalVariableBinding variable : variables) {
if (variable == binding) continue; // Shouldn't happen
if (CharOperation.equals(binding.name, variable.name)) {
scope.problemReporter().redefineLocal(this.local);
}
}
}
if (this.patternVarsWhenTrue == null) {
this.patternVarsWhenTrue = new LocalVariableBinding[1];
this.patternVarsWhenTrue[0] = binding;
} else {
LocalVariableBinding[] vars = new LocalVariableBinding[1];
vars[0] = binding;
this.addPatternVariablesWhenTrue(vars);
}
}
}
@Override
public boolean checkUnsafeCast(Scope scope, TypeBinding castType, TypeBinding expressionType, TypeBinding match, boolean isNarrowing) {
if (!castType.isReifiable())
return CastExpression.checkUnsafeCast(this, scope, castType, expressionType, match, isNarrowing);
else
return super.checkUnsafeCast(scope, castType, expressionType, match, isNarrowing);
}
@Override
public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
if (this.local != null) {
flowInfo.markAsDefinitelyAssigned(this.local.binding);
if (!this.isTotalTypeNode) {
// non-total type patterns create a nonnull local:
flowInfo.markAsDefinitelyNonNull(this.local.binding);
} else {
// total type patterns inherit the nullness of the value being switched over, unless ...
if (flowContext.associatedNode instanceof SwitchStatement) {
SwitchStatement swStmt = (SwitchStatement) flowContext.associatedNode;
int nullStatus = swStmt.containsNull
? FlowInfo.NON_NULL // ... null is handled in a separate case
: swStmt.expression.nullStatus(flowInfo, flowContext);
flowInfo.markNullStatus(this.local.binding, nullStatus);
}
}
}
super.analyseCode(currentScope, flowContext, flowInfo);
return flowInfo;
}
@Override
public void generateOptimizedBoolean(BlockScope currentScope, CodeStream codeStream, BranchLabel trueLabel, BranchLabel falseLabel) {
if (this.local != null) {
LocalVariableBinding localBinding = this.local.binding;
if (!this.isTotalTypeNode) {
codeStream.checkcast(localBinding.type);
}
this.local.generateCode(currentScope, codeStream);
codeStream.store(localBinding, false);
localBinding.recordInitializationStartPC(codeStream.position);
}
}
public void initializePatternVariables(BlockScope currentScope, CodeStream codeStream) {
codeStream.addVariable(this.secretPatternVariable);
codeStream.store(this.secretPatternVariable, false);
}
@Override
protected void generatePatternVariable(BlockScope currentScope, CodeStream codeStream, BranchLabel trueLabel, BranchLabel falseLabel) {
if (this.local != null) {
codeStream.load(this.secretPatternVariable);
LocalVariableBinding localBinding = this.local.binding;
if (!this.isTotalTypeNode)
codeStream.checkcast(localBinding.type);
this.local.generateCode(currentScope, codeStream);
codeStream.store(localBinding, false);
localBinding.recordInitializationStartPC(codeStream.position);
}
}
@Override
public void wrapupGeneration(CodeStream codeStream) {
codeStream.removeVariable(this.secretPatternVariable);
}
@Override
public LocalDeclaration getPatternVariable() {
return this.local;
}
@Override
public void resolveWithExpression(BlockScope scope, Expression exp) {
this.expression = exp;
}
@Override
public void resolve(BlockScope scope) {
this.resolveType(scope);
}
@Override
public boolean isTotalForType(TypeBinding type) {
if (type == null || this.resolvedType == null)
return false;
return (type.isSubtypeOf(this.resolvedType, false));
}
@Override
protected boolean isPatternTypeCompatible(TypeBinding other, BlockScope scope) {
TypeBinding patternType = this.resolvedType;
if (patternType.isBaseType()) {
if (!TypeBinding.equalsEquals(other, patternType)) {
scope.problemReporter().incompatiblePatternType(this, other, patternType);
return false;
}
} else if (!checkCastTypesCompatibility(scope, other, patternType, this.expression, true)) {
scope.problemReporter().incompatiblePatternType(this, other, patternType);
return false;
}
return true;
}
@Override
public boolean dominates(Pattern p) {
return isTotalForType(p.resolvedType);
}
/*
* A type pattern, p, declaring a pattern variable x of type T, that is total for U,
* is resolved to an any pattern that declares x of type T;
* otherwise it is resolved to p.
*/
@Override
public TypeBinding resolveAtType(BlockScope scope, TypeBinding u) {
if (this.resolvedType == null) {
this.resolvedType = this.local.binding.type;
}
return this.resolvedType;
}
@Override
public TypeBinding resolveType(BlockScope scope, boolean isPatternVariable) {
if (this.resolvedType != null)
return this.resolvedType;
if (this.local != null) {
this.local.modifiers |= ExtraCompilerModifiers.AccPatternVariable;
this.local.resolve(scope, isPatternVariable);
if (this.local.binding != null) {
this.local.binding.modifiers |= ExtraCompilerModifiers.AccPatternVariable;
this.local.binding.useFlag = LocalVariableBinding.USED;
this.resolvedType = this.local.binding.type;
}
initSecretPatternVariable(scope);
}
return this.resolvedType;
}
protected void initSecretPatternVariable(BlockScope scope) {
LocalVariableBinding l =
this.secretPatternVariable =
new LocalVariableBinding(
SECRET_PATTERN_VARIABLE_NAME,
this.resolvedType,
ClassFileConstants.AccDefault,
false);
l.setConstant(Constant.NotAConstant);
l.useFlag = LocalVariableBinding.USED;
scope.addLocalVariable(l);
}
@Override
public void traverse(ASTVisitor visitor, BlockScope scope) {
if (visitor.visit(this, scope)) {
if (this.local != null)
this.local.traverse(visitor, scope);
}
visitor.endVisit(this, scope);
}
@Override
public StringBuffer printExpression(int indent, StringBuffer output) {
return this.local != null ? this.local.printAsExpression(indent, output) : output;
}
}
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