X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Forg%2Feclipse%2Fjdt%2Finternal%2Fcompiler%2Fast%2FReturnStatement.java;fp=src%2Forg%2Feclipse%2Fjdt%2Finternal%2Fcompiler%2Fast%2FReturnStatement.java;h=0000000000000000000000000000000000000000;hb=6f0cd02d46e011bd5599e1b7fefc6159cb811135;hp=ca74dae3647dfd6dc66df759c7d77c72b402b5eb;hpb=622d0e5a4b1b35b6918a516a79a0cc22272a919e;p=org.ibex.tool.git diff --git a/src/org/eclipse/jdt/internal/compiler/ast/ReturnStatement.java b/src/org/eclipse/jdt/internal/compiler/ast/ReturnStatement.java deleted file mode 100644 index ca74dae..0000000 --- a/src/org/eclipse/jdt/internal/compiler/ast/ReturnStatement.java +++ /dev/null @@ -1,238 +0,0 @@ -/******************************************************************************* - * Copyright (c) 2000, 2004 IBM Corporation and others. - * All rights reserved. This program and the accompanying materials - * are made available under the terms of the Common Public License v1.0 - * which accompanies this distribution, and is available at - * http://www.eclipse.org/legal/cpl-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.codegen.*; -import org.eclipse.jdt.internal.compiler.flow.*; -import org.eclipse.jdt.internal.compiler.lookup.*; - -public class ReturnStatement extends Statement { - - public Expression expression; - public TypeBinding expressionType; - public boolean isSynchronized; - public SubRoutineStatement[] subroutines; - public boolean isAnySubRoutineEscaping = false; - public LocalVariableBinding saveValueVariable; - - public ReturnStatement(Expression expr, int s, int e ) { - sourceStart = s; - sourceEnd = e; - expression = expr ; - } - public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) { // here requires to generate a sequence of finally blocks invocations depending corresponding - // to each of the traversed try statements, so that execution will terminate properly. - - // lookup the label, this should answer the returnContext - - if (expression != null) { - flowInfo = expression.analyseCode(currentScope, flowContext, flowInfo); - } - // compute the return sequence (running the finally blocks) - FlowContext traversedContext = flowContext; - int subIndex = 0, maxSub = 5; - boolean saveValueNeeded = false; - boolean hasValueToSave = expression != null && expression.constant == NotAConstant; - do { - SubRoutineStatement sub; - if ((sub = traversedContext.subRoutine()) != null) { - if (this.subroutines == null){ - this.subroutines = new SubRoutineStatement[maxSub]; - } - if (subIndex == maxSub) { - System.arraycopy(this.subroutines, 0, (this.subroutines = new SubRoutineStatement[maxSub *= 2]), 0, subIndex); // grow - } - this.subroutines[subIndex++] = sub; - if (sub.isSubRoutineEscaping()) { - saveValueNeeded = false; - isAnySubRoutineEscaping = true; - break; - } - } - traversedContext.recordReturnFrom(flowInfo.unconditionalInits()); - - ASTNode node; - if ((node = traversedContext.associatedNode) instanceof SynchronizedStatement) { - isSynchronized = true; - - } else if (node instanceof TryStatement) { - TryStatement tryStatement = (TryStatement) node; - flowInfo.addInitializationsFrom(tryStatement.subRoutineInits); // collect inits - if (hasValueToSave) { - if (this.saveValueVariable == null){ // closest subroutine secret variable is used - prepareSaveValueLocation(tryStatement); - } - saveValueNeeded = true; - } - - } else if (traversedContext instanceof InitializationFlowContext) { - currentScope.problemReporter().cannotReturnInInitializer(this); - return FlowInfo.DEAD_END; - } - } while ((traversedContext = traversedContext.parent) != null); - - // resize subroutines - if ((subroutines != null) && (subIndex != maxSub)) { - System.arraycopy(subroutines, 0, (subroutines = new SubRoutineStatement[subIndex]), 0, subIndex); - } - - // secret local variable for return value (note that this can only occur in a real method) - if (saveValueNeeded) { - if (this.saveValueVariable != null) { - this.saveValueVariable.useFlag = LocalVariableBinding.USED; - } - } else { - this.saveValueVariable = null; - if ((!isSynchronized) && (expressionType == BooleanBinding)) { - this.expression.bits |= ValueForReturnMASK; - } - } - return FlowInfo.DEAD_END; - } - - /** - * Retrun statement code generation - * - * generate the finallyInvocationSequence. - * - * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope - * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream - */ - public void generateCode(BlockScope currentScope, CodeStream codeStream) { - if ((bits & IsReachableMASK) == 0) { - return; - } - int pc = codeStream.position; - // generate the expression - if ((expression != null) && (expression.constant == NotAConstant)) { - expression.generateCode(currentScope, codeStream, needValue()); // no value needed if non-returning subroutine - generateStoreSaveValueIfNecessary(codeStream); - } - - // generation of code responsible for invoking the finally blocks in sequence - if (subroutines != null) { - for (int i = 0, max = subroutines.length; i < max; i++) { - SubRoutineStatement sub = subroutines[i]; - sub.generateSubRoutineInvocation(currentScope, codeStream); - if (sub.isSubRoutineEscaping()) { - codeStream.recordPositionsFrom(pc, this.sourceStart); - SubRoutineStatement.reenterExceptionHandlers(subroutines, i, codeStream); - return; - } - sub.exitAnyExceptionHandler(); - } - } - if (saveValueVariable != null) codeStream.load(saveValueVariable); - - if ((expression != null) && (expression.constant != NotAConstant)) { - codeStream.generateConstant(expression.constant, expression.implicitConversion); - generateStoreSaveValueIfNecessary(codeStream); - } - // output the suitable return bytecode or wrap the value inside a descriptor for doits - this.generateReturnBytecode(codeStream); - codeStream.recordPositionsFrom(pc, this.sourceStart); - SubRoutineStatement.reenterExceptionHandlers(subroutines, -1, codeStream); - } - /** - * Dump the suitable return bytecode for a return statement - * - */ - public void generateReturnBytecode(CodeStream codeStream) { - - if (expression == null) { - codeStream.return_(); - } else { - switch (expression.implicitConversion >> 4) { - case T_boolean : - case T_int : - codeStream.ireturn(); - break; - case T_float : - codeStream.freturn(); - break; - case T_long : - codeStream.lreturn(); - break; - case T_double : - codeStream.dreturn(); - break; - default : - codeStream.areturn(); - } - } - } - public void generateStoreSaveValueIfNecessary(CodeStream codeStream){ - if (saveValueVariable != null) codeStream.store(saveValueVariable, false); - } - public boolean needValue(){ - return (subroutines == null) || (saveValueVariable != null) || isSynchronized; - } - public void prepareSaveValueLocation(TryStatement targetTryStatement){ - - this.saveValueVariable = targetTryStatement.secretReturnValue; - } - public StringBuffer printStatement(int tab, StringBuffer output){ - - printIndent(tab, output).append("return "); //$NON-NLS-1$ - if (expression != null ) - expression.printExpression(0, output) ; - return output.append(';'); - } - public void resolve(BlockScope scope) { - MethodScope methodScope = scope.methodScope(); - MethodBinding methodBinding; - TypeBinding methodType = - (methodScope.referenceContext instanceof AbstractMethodDeclaration) - ? ((methodBinding = ((AbstractMethodDeclaration) methodScope.referenceContext).binding) == null - ? null - : methodBinding.returnType) - : VoidBinding; - if (methodType == VoidBinding) { - // the expression should be null - if (expression == null) - return; - if ((expressionType = expression.resolveType(scope)) != null) - scope.problemReporter().attemptToReturnNonVoidExpression(this, expressionType); - return; - } - if (expression == null) { - if (methodType != null) scope.problemReporter().shouldReturn(methodType, this); - return; - } - if ((expressionType = expression.resolveType(scope)) == null) - return; - - if (methodType != null && expression.isConstantValueOfTypeAssignableToType(expressionType, methodType)) { - // dealing with constant - expression.implicitWidening(methodType, expressionType); - return; - } - if (expressionType == VoidBinding) { - scope.problemReporter().attemptToReturnVoidValue(this); - return; - } - if (methodType != null && expressionType.isCompatibleWith(methodType)) { - expression.implicitWidening(methodType, expressionType); - return; - } - if (methodType != null){ - scope.problemReporter().typeMismatchErrorActualTypeExpectedType(expression, expressionType, methodType); - } - } - public void traverse(ASTVisitor visitor, BlockScope scope) { - if (visitor.visit(this, scope)) { - if (expression != null) - expression.traverse(visitor, scope); - } - visitor.endVisit(this, scope); - } -}