| /******************************************************************************* |
| * Copyright (c) 2000, 2005 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 |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.compiler.ast; |
| |
| import org.eclipse.jdt.internal.compiler.ASTVisitor; |
| import org.eclipse.jdt.internal.compiler.impl.*; |
| import org.eclipse.jdt.internal.compiler.codegen.*; |
| import org.eclipse.jdt.internal.compiler.flow.*; |
| import org.eclipse.jdt.internal.compiler.lookup.*; |
| |
| public class LocalDeclaration extends AbstractVariableDeclaration { |
| |
| public LocalVariableBinding binding; |
| |
| public LocalDeclaration( |
| char[] name, |
| int sourceStart, |
| int sourceEnd) { |
| |
| this.name = name; |
| this.sourceStart = sourceStart; |
| this.sourceEnd = sourceEnd; |
| this.declarationEnd = sourceEnd; |
| } |
| |
| public FlowInfo analyseCode( |
| BlockScope currentScope, |
| FlowContext flowContext, |
| FlowInfo flowInfo) { |
| |
| // record variable initialization if any |
| if (flowInfo.isReachable()) { |
| bits |= IsLocalDeclarationReachableMASK; // only set if actually reached |
| } |
| if (this.initialization == null) |
| return flowInfo; |
| |
| int nullStatus = this.initialization.nullStatus(flowInfo); |
| flowInfo = |
| this.initialization |
| .analyseCode(currentScope, flowContext, flowInfo) |
| .unconditionalInits(); |
| |
| flowInfo.markAsDefinitelyAssigned(binding); |
| switch(nullStatus) { |
| case FlowInfo.NULL : |
| flowInfo.markAsDefinitelyNull(this.binding); |
| break; |
| case FlowInfo.NON_NULL : |
| flowInfo.markAsDefinitelyNonNull(this.binding); |
| break; |
| } |
| return flowInfo; |
| } |
| |
| public void checkModifiers() { |
| |
| //only potential valid modifier is <<final>> |
| if (((modifiers & AccJustFlag) & ~AccFinal) != 0) |
| //AccModifierProblem -> other (non-visibility problem) |
| //AccAlternateModifierProblem -> duplicate modifier |
| //AccModifierProblem | AccAlternateModifierProblem -> visibility problem" |
| |
| modifiers = (modifiers & ~AccAlternateModifierProblem) | AccModifierProblem; |
| } |
| |
| /** |
| * Code generation for a local declaration: |
| * i.e. normal assignment to a local variable + unused variable handling |
| */ |
| public void generateCode(BlockScope currentScope, CodeStream codeStream) { |
| |
| // even if not reachable, variable must be added to visible if allocated (28298) |
| if (binding.resolvedPosition != -1) { |
| codeStream.addVisibleLocalVariable(binding); |
| } |
| if ((bits & IsReachableMASK) == 0) { |
| return; |
| } |
| int pc = codeStream.position; |
| Constant inlinedValue; |
| |
| // something to initialize? |
| if (initialization != null) { |
| // initialize to constant value? |
| if ((inlinedValue = initialization.constant) != NotAConstant) { |
| // forget initializing unused or final locals set to constant value (final ones are inlined) |
| if (binding.resolvedPosition != -1) { // may need to preserve variable |
| int initPC = codeStream.position; |
| codeStream.generateConstant(inlinedValue, initialization.implicitConversion); |
| codeStream.recordPositionsFrom(initPC, initialization.sourceStart); |
| codeStream.store(binding, false); |
| binding.recordInitializationStartPC(codeStream.position); |
| // codeStream.lastInitStateIndexWhenRemovingInits = -2; // reinitialize remove index |
| // codeStream.lastInitStateIndexWhenAddingInits = -2; // reinitialize add index |
| } |
| } else { // initializing to non-constant value |
| initialization.generateCode(currentScope, codeStream, true); |
| // if binding unused generate then discard the value |
| if (binding.resolvedPosition != -1) { |
| // 26903, need extra cast to store null in array local var |
| if (binding.type.isArrayType() |
| && (initialization.resolvedType == NullBinding // arrayLoc = null |
| || ((initialization instanceof CastExpression) // arrayLoc = (type[])null |
| && (((CastExpression)initialization).innermostCastedExpression().resolvedType == NullBinding)))){ |
| codeStream.checkcast(binding.type); |
| } |
| codeStream.store(binding, false); |
| if (binding.initializationCount == 0) { |
| /* Variable may have been initialized during the code initializing it |
| e.g. int i = (i = 1); |
| */ |
| binding.recordInitializationStartPC(codeStream.position); |
| // codeStream.lastInitStateIndexWhenRemovingInits = -2; // reinitialize remove index |
| // codeStream.lastInitStateIndexWhenAddingInits = -2; // reinitialize add index |
| } |
| } else { |
| if ((binding.type == LongBinding) || (binding.type == DoubleBinding)) { |
| codeStream.pop2(); |
| } else { |
| codeStream.pop(); |
| } |
| } |
| } |
| } |
| codeStream.recordPositionsFrom(pc, this.sourceStart); |
| } |
| |
| /** |
| * @see org.eclipse.jdt.internal.compiler.ast.AbstractVariableDeclaration#getKind() |
| */ |
| public int getKind() { |
| return LOCAL_VARIABLE; |
| } |
| |
| public void resolve(BlockScope scope) { |
| |
| // create a binding and add it to the scope |
| TypeBinding variableType = type.resolveType(scope, true /* check bounds*/); |
| |
| checkModifiers(); |
| if (variableType != null) { |
| if (variableType == VoidBinding) { |
| scope.problemReporter().variableTypeCannotBeVoid(this); |
| return; |
| } |
| if (variableType.isArrayType() && ((ArrayBinding) variableType).leafComponentType == VoidBinding) { |
| scope.problemReporter().variableTypeCannotBeVoidArray(this); |
| return; |
| } |
| } |
| |
| Binding existingVariable = scope.getBinding(name, Binding.VARIABLE, this, false /*do not resolve hidden field*/); |
| boolean shouldInsertInScope = true; |
| if (existingVariable != null && existingVariable.isValidBinding()){ |
| if (existingVariable instanceof LocalVariableBinding && this.hiddenVariableDepth == 0) { |
| shouldInsertInScope = false; |
| scope.problemReporter().redefineLocal(this); |
| } else { |
| scope.problemReporter().localVariableHiding(this, existingVariable, false); |
| } |
| } |
| |
| if (shouldInsertInScope) { |
| if ((modifiers & AccFinal)!= 0 && this.initialization == null) { |
| modifiers |= AccBlankFinal; |
| } |
| this.binding = new LocalVariableBinding(this, variableType, modifiers, false); |
| scope.addLocalVariable(binding); |
| this.binding.setConstant(NotAConstant); |
| // allow to recursivelly target the binding.... |
| // the correct constant is harmed if correctly computed at the end of this method |
| |
| resolveAnnotations(scope, this.annotations, this.binding); |
| } |
| |
| if (variableType == null) { |
| if (initialization != null) |
| initialization.resolveType(scope); // want to report all possible errors |
| return; |
| } |
| |
| // store the constant for final locals |
| if (initialization != null) { |
| if (initialization instanceof ArrayInitializer) { |
| TypeBinding initializationType = initialization.resolveTypeExpecting(scope, variableType); |
| if (initializationType != null) { |
| ((ArrayInitializer) initialization).binding = (ArrayBinding) initializationType; |
| initialization.computeConversion(scope, variableType, initializationType); |
| } |
| } else { |
| this.initialization.setExpectedType(variableType); |
| TypeBinding initializationType = this.initialization.resolveType(scope); |
| if (initializationType != null) { |
| if (variableType != initializationType) // must call before computeConversion() and typeMismatchError() |
| scope.compilationUnitScope().recordTypeConversion(variableType, initializationType); |
| if (initialization.isConstantValueOfTypeAssignableToType(initializationType, variableType) |
| || (variableType.isBaseType() && BaseTypeBinding.isWidening(variableType.id, initializationType.id)) |
| || initializationType.isCompatibleWith(variableType)) { |
| this.initialization.computeConversion(scope, variableType, initializationType); |
| if (initializationType.needsUncheckedConversion(variableType)) { |
| scope.problemReporter().unsafeTypeConversion(this.initialization, initializationType, variableType); |
| } |
| } else if (scope.environment().options.sourceLevel >= JDK1_5 // autoboxing |
| && (scope.isBoxingCompatibleWith(initializationType, variableType) |
| || (initializationType.isBaseType() // narrowing then boxing ? |
| && initializationType != null |
| && !variableType.isBaseType() |
| && initialization.isConstantValueOfTypeAssignableToType(initializationType, scope.environment().computeBoxingType(variableType))))) { |
| this.initialization.computeConversion(scope, variableType, initializationType); |
| } else { |
| scope.problemReporter().typeMismatchError(initializationType, variableType, this); |
| } |
| } |
| } |
| |
| // change the constant in the binding when it is final |
| // (the optimization of the constant propagation will be done later on) |
| // cast from constant actual type to variable type |
| if (binding != null) { |
| binding.setConstant( |
| binding.isFinal() |
| ? initialization.constant.castTo((variableType.id << 4) + initialization.constant.typeID()) |
| : NotAConstant); |
| } |
| } |
| } |
| |
| public void traverse(ASTVisitor visitor, BlockScope scope) { |
| |
| if (visitor.visit(this, scope)) { |
| type.traverse(visitor, scope); |
| if (initialization != null) |
| initialization.traverse(visitor, scope); |
| } |
| visitor.endVisit(this, scope); |
| } |
| } |
