| /******************************************************************************* |
| * 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.codegen.*; |
| import org.eclipse.jdt.internal.compiler.flow.*; |
| import org.eclipse.jdt.internal.compiler.impl.Constant; |
| import org.eclipse.jdt.internal.compiler.lookup.*; |
| |
| public abstract class Statement extends ASTNode { |
| |
| public abstract FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo); |
| |
| /** |
| * INTERNAL USE ONLY. |
| * This is used to redirect inter-statements jumps. |
| */ |
| public void branchChainTo(Label label) { |
| // do nothing by default |
| } |
| |
| // Report an error if necessary |
| public boolean complainIfUnreachable(FlowInfo flowInfo, BlockScope scope, boolean didAlreadyComplain) { |
| |
| if ((flowInfo.reachMode() & FlowInfo.UNREACHABLE) != 0) { |
| this.bits &= ~ASTNode.IsReachableMASK; |
| boolean reported = flowInfo == FlowInfo.DEAD_END; |
| if (!didAlreadyComplain && reported) { |
| scope.problemReporter().unreachableCode(this); |
| } |
| return reported; // keep going for fake reachable |
| } |
| return false; |
| } |
| |
| /** |
| * Generate invocation arguments, considering varargs methods |
| */ |
| public void generateArguments(MethodBinding binding, Expression[] arguments, BlockScope currentScope, CodeStream codeStream) { |
| |
| if (binding.isVarargs()) { |
| // 5 possibilities exist for a call to the vararg method foo(int i, int ... value) : |
| // foo(1), foo(1, null), foo(1, 2), foo(1, 2, 3, 4) & foo(1, new int[] {1, 2}) |
| TypeBinding[] params = binding.parameters; |
| int paramLength = params.length; |
| int varArgIndex = paramLength - 1; |
| for (int i = 0; i < varArgIndex; i++) { |
| arguments[i].generateCode(currentScope, codeStream, true); |
| } |
| |
| ArrayBinding varArgsType = (ArrayBinding) params[varArgIndex]; // parameterType has to be an array type |
| int elementsTypeID = varArgsType.elementsType().id; |
| int argLength = arguments == null ? 0 : arguments.length; |
| |
| if (argLength > paramLength) { |
| // right number but not directly compatible or too many arguments - wrap extra into array |
| // called with (argLength - lastIndex) elements : foo(1, 2) or foo(1, 2, 3, 4) |
| // need to gen elements into an array, then gen each remaining element into created array |
| codeStream.generateInlinedValue(argLength - varArgIndex); |
| codeStream.newArray(varArgsType); // create a mono-dimensional array |
| for (int i = varArgIndex; i < argLength; i++) { |
| codeStream.dup(); |
| codeStream.generateInlinedValue(i - varArgIndex); |
| arguments[i].generateCode(currentScope, codeStream, true); |
| codeStream.arrayAtPut(elementsTypeID, false); |
| } |
| } else if (argLength == paramLength) { |
| // right number of arguments - could be inexact - pass argument as is |
| TypeBinding lastType = arguments[varArgIndex].resolvedType; |
| if (lastType == NullBinding |
| || (varArgsType.dimensions() == lastType.dimensions() |
| && lastType.isCompatibleWith(varArgsType))) { |
| // foo(1, new int[]{2, 3}) or foo(1, null) --> last arg is passed as-is |
| arguments[varArgIndex].generateCode(currentScope, codeStream, true); |
| } else { |
| // right number but not directly compatible or too many arguments - wrap extra into array |
| // need to gen elements into an array, then gen each remaining element into created array |
| codeStream.generateInlinedValue(1); |
| codeStream.newArray(varArgsType); // create a mono-dimensional array |
| codeStream.dup(); |
| codeStream.generateInlinedValue(0); |
| arguments[varArgIndex].generateCode(currentScope, codeStream, true); |
| codeStream.arrayAtPut(elementsTypeID, false); |
| } |
| } else { // not enough arguments - pass extra empty array |
| // scenario: foo(1) --> foo(1, new int[0]) |
| // generate code for an empty array of parameterType |
| codeStream.generateInlinedValue(0); |
| codeStream.newArray(varArgsType); // create a mono-dimensional array |
| } |
| } else if (arguments != null) { // standard generation for method arguments |
| for (int i = 0, max = arguments.length; i < max; i++) |
| arguments[i].generateCode(currentScope, codeStream, true); |
| } |
| } |
| |
| public abstract void generateCode(BlockScope currentScope, CodeStream codeStream); |
| |
| public boolean isEmptyBlock() { |
| return false; |
| } |
| |
| public boolean isValidJavaStatement() { |
| //the use of this method should be avoid in most cases |
| //and is here mostly for documentation purpose..... |
| //while the parser is responsable for creating |
| //welled formed expression statement, which results |
| //in the fact that java-non-semantic-expression-used-as-statement |
| //should not be parsable...thus not being built. |
| //It sounds like the java grammar as help the compiler job in removing |
| //-by construction- some statement that would have no effect.... |
| //(for example all expression that may do side-effects are valid statement |
| // -this is an appromative idea.....-) |
| |
| return true; |
| } |
| |
| public StringBuffer print(int indent, StringBuffer output) { |
| return printStatement(indent, output); |
| } |
| public abstract StringBuffer printStatement(int indent, StringBuffer output); |
| |
| public abstract void resolve(BlockScope scope); |
| |
| /** |
| * Returns case constant associated to this statement (NotAConstant if none) |
| */ |
| public Constant resolveCase(BlockScope scope, TypeBinding testType, SwitchStatement switchStatement) { |
| // statement within a switch that are not case are treated as normal statement.... |
| |
| resolve(scope); |
| return NotAConstant; |
| } |
| |
| } |