| /******************************************************************************* |
| * Copyright (c) 2000, 2008 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.wst.jsdt.internal.compiler.ast; |
| |
| import org.eclipse.wst.jsdt.core.ast.IASTNode; |
| import org.eclipse.wst.jsdt.core.ast.IUnaryExpression; |
| import org.eclipse.wst.jsdt.internal.compiler.ASTVisitor; |
| import org.eclipse.wst.jsdt.internal.compiler.classfmt.ClassFileConstants; |
| import org.eclipse.wst.jsdt.internal.compiler.flow.FlowContext; |
| import org.eclipse.wst.jsdt.internal.compiler.flow.FlowInfo; |
| import org.eclipse.wst.jsdt.internal.compiler.impl.BooleanConstant; |
| import org.eclipse.wst.jsdt.internal.compiler.impl.Constant; |
| import org.eclipse.wst.jsdt.internal.compiler.lookup.BlockScope; |
| import org.eclipse.wst.jsdt.internal.compiler.lookup.TypeBinding; |
| |
| public class UnaryExpression extends OperatorExpression implements IUnaryExpression { |
| |
| public Expression expression; |
| public Constant optimizedBooleanConstant; |
| |
| public UnaryExpression(Expression expression, int operator) { |
| this.expression = expression; |
| this.bits |= operator << OperatorSHIFT; // encode operator |
| } |
| |
| public FlowInfo analyseCode( |
| BlockScope currentScope, |
| FlowContext flowContext, |
| FlowInfo flowInfo) { |
| this.expression.checkNPE(currentScope, flowContext, flowInfo); |
| if (((bits & OperatorMASK) >> OperatorSHIFT) == NOT) { |
| return this.expression. |
| analyseCode(currentScope, flowContext, flowInfo). |
| asNegatedCondition(); |
| } else { |
| return this.expression. |
| analyseCode(currentScope, flowContext, flowInfo); |
| } |
| } |
| |
| public Constant optimizedBooleanConstant() { |
| |
| return this.optimizedBooleanConstant == null |
| ? this.constant |
| : this.optimizedBooleanConstant; |
| } |
| |
| public StringBuffer printExpressionNoParenthesis(int indent, StringBuffer output) { |
| |
| output.append(operatorToString()).append(' '); |
| return this.expression.printExpression(0, output); |
| } |
| |
| protected final int getOperator() |
| { |
| return (bits & OperatorMASK) >> OperatorSHIFT; |
| } |
| |
| public TypeBinding resolveType(BlockScope scope) { |
| |
| if (this.expression instanceof CastExpression == true) this.expression.bits |= DisableUnnecessaryCastCheck; // will check later on |
| TypeBinding expressionType = null; |
| if (getOperator()==TYPEOF && (this.expression instanceof SingleNameReference)) |
| expressionType=TypeBinding.UNKNOWN; |
| else |
| expressionType = this.expression.resolveType(scope); |
| if (expressionType == null) { |
| this.constant = Constant.NotAConstant; |
| return null; |
| } |
| int expressionTypeID = expressionType.id; |
| // autoboxing support |
| boolean use15specifics = scope.compilerOptions().sourceLevel >= ClassFileConstants.JDK1_5; |
| if (use15specifics) { |
| if (!expressionType.isBaseType()) { |
| expressionTypeID = scope.environment().computeBoxingType(expressionType).id; |
| } |
| } |
| if (expressionTypeID > 15) { |
| this.constant = Constant.NotAConstant; |
| scope.problemReporter().invalidOperator(this, expressionType); |
| return null; |
| } |
| |
| int tableId=-1; |
| int operator = (bits & OperatorMASK) >> OperatorSHIFT; |
| switch (operator) { |
| case NOT : |
| this.resolvedType= TypeBinding.BOOLEAN; |
| break; |
| case TWIDDLE : |
| tableId = LEFT_SHIFT; |
| break; |
| case TYPEOF : |
| this.resolvedType= scope.getJavaLangString(); |
| break; |
| case OperatorIds.VOID : |
| this.resolvedType= TypeBinding.VOID; |
| break; |
| default : |
| tableId = MINUS; |
| } //+ and - cases |
| |
| // the code is an int |
| // (cast) left Op (cast) rigth --> result |
| // 0000 0000 0000 0000 0000 |
| // <<16 <<12 <<8 <<4 <<0 |
| if (tableId>-1) // not already determined |
| { |
| int operatorSignature = OperatorSignatures[tableId][(expressionTypeID << 4) + expressionTypeID]; |
| // this.expression.computeConversion(scope, TypeBinding.wellKnownType(scope, (operatorSignature >>> 16) & 0x0000F), expressionType); |
| this.bits |= operatorSignature & 0xF; |
| switch (operatorSignature & 0xF) { // only switch on possible result type..... |
| case T_boolean : |
| this.resolvedType = TypeBinding.BOOLEAN; |
| break; |
| case T_byte : |
| this.resolvedType = TypeBinding.BYTE; |
| break; |
| case T_char : |
| this.resolvedType = TypeBinding.CHAR; |
| break; |
| case T_double : |
| this.resolvedType = TypeBinding.DOUBLE; |
| break; |
| case T_float : |
| this.resolvedType = TypeBinding.FLOAT; |
| break; |
| case T_int : |
| this.resolvedType = scope.getJavaLangNumber(); |
| break; |
| case T_long : |
| this.resolvedType = TypeBinding.LONG; |
| break; |
| case T_any : |
| this.resolvedType = TypeBinding.UNKNOWN; |
| break; |
| default : //error........ |
| this.constant = Constant.NotAConstant; |
| if (expressionTypeID != T_undefined) |
| scope.problemReporter().invalidOperator(this, expressionType); |
| return null; |
| } |
| } |
| // compute the constant when valid |
| if (this.expression.constant != Constant.NotAConstant) { |
| this.constant = |
| Constant.computeConstantOperation( |
| this.expression.constant, |
| expressionTypeID, |
| operator); |
| } else { |
| this.constant = Constant.NotAConstant; |
| if (operator == NOT) { |
| Constant cst = expression.optimizedBooleanConstant(); |
| if (cst != Constant.NotAConstant) |
| this.optimizedBooleanConstant = BooleanConstant.fromValue(!cst.booleanValue()); |
| } |
| } |
| // if (expressionIsCast) { |
| // // check need for operand cast |
| // CastExpression.checkNeedForArgumentCast(scope, tableId, operatorSignature, this.expression, expressionTypeID); |
| // } |
| return this.resolvedType; |
| } |
| |
| public void traverse( |
| ASTVisitor visitor, |
| BlockScope blockScope) { |
| |
| if (visitor.visit(this, blockScope)) { |
| this.expression.traverse(visitor, blockScope); |
| } |
| visitor.endVisit(this, blockScope); |
| } |
| public int getASTType() { |
| return IASTNode.UNARY_EXPRESSION; |
| |
| } |
| } |