+++ /dev/null
-/*******************************************************************************
- * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Common Public License v0.5
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/cpl-v05.html
- *
- * Contributors:
- * IBM Corporation - initial API and implementation
- ******************************************************************************/
-package net.sourceforge.phpdt.internal.compiler.ast;
-
-import net.sourceforge.phpdt.internal.compiler.IAbstractSyntaxTreeVisitor;
-import net.sourceforge.phpdt.internal.compiler.codegen.CodeStream;
-import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
-import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
-import net.sourceforge.phpdt.internal.compiler.impl.Constant;
-import net.sourceforge.phpdt.internal.compiler.lookup.ArrayBinding;
-import net.sourceforge.phpdt.internal.compiler.lookup.BaseTypeBinding;
-import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
-import net.sourceforge.phpdt.internal.compiler.lookup.LocalVariableBinding;
-import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
-
-public class LocalDeclaration extends AbstractVariableDeclaration {
-
- public LocalVariableBinding binding;
-
- public LocalDeclaration(
- Expression expr,
- char[] name,
- int sourceStart,
- int sourceEnd) {
-
- initialization = expr;
- this.name = name;
- this.sourceStart = sourceStart;
- this.sourceEnd = sourceEnd;
- if (initialization != null) {
- this.declarationSourceEnd = initialization.sourceEnd;
- } else {
- this.declarationSourceEnd = sourceEnd;
- }
- this.declarationEnd = this.declarationSourceEnd;
- }
-
- public FlowInfo analyseCode(
- BlockScope currentScope,
- FlowContext flowContext,
- FlowInfo flowInfo) {
-
- // record variable initialization if any
- if (!flowInfo.isDeadEnd() && !flowInfo.isFakeReachable()) {
- bits |= IsLocalDeclarationReachableMASK; // only set if actually reached
- }
- if (initialization == null)
- return flowInfo;
- flowInfo =
- initialization
- .analyseCode(currentScope, flowContext, flowInfo)
- .unconditionalInits();
- flowInfo.markAsDefinitelyAssigned(binding);
- return flowInfo;
- }
-
- public void checkModifiers() {
- //only potential valid modifier is <<final>>
-
- if (((modifiers & AccJustFlag) | AccFinal) != AccFinal)
- //AccModifierProblem -> other (non-visibility problem)
- //AccAlternateModifierProblem -> duplicate modifier
- //AccModifierProblem | AccAlternateModifierProblem -> visibility problem"
- // -x-1 returns the bitInvert
-
- modifiers =
- (modifiers & (-AccAlternateModifierProblem - 1)) | 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) {
-
- if ((bits & IsReachableMASK) == 0) {
- return;
- }
- int pc = codeStream.position;
- Constant inlinedValue;
- // something to initialize?
- if (binding.resolvedPosition != -1) {
- codeStream.addVisibleLocalVariable(binding);
- }
- 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) {
- 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);
- }
-
- public String name() {
-
- return String.valueOf(name);
- }
-
- public void resolve(BlockScope scope) {
-
- // create a binding and add it to the scope
- TypeBinding tb = type.resolveType(scope);
-
- checkModifiers();
-
- if (tb != null) {
- if (tb == VoidBinding) {
- scope.problemReporter().variableTypeCannotBeVoid(this);
- return;
- }
- if (tb.isArrayType() && ((ArrayBinding) tb).leafComponentType == VoidBinding) {
- scope.problemReporter().variableTypeCannotBeVoidArray(this);
- return;
- }
- }
-
- // duplicate checks
- if ((binding = scope.duplicateName(name)) != null) {
- // the name already exists... may carry on with the first binding...
- scope.problemReporter().redefineLocal(this);
- } else {
- binding = new LocalVariableBinding(this, tb, modifiers, false);
- scope.addLocalVariable(binding);
- binding.constant = NotAConstant;
- // allow to recursivelly target the binding....
- // the correct constant is harmed if correctly computed at the end of this method
- }
-
- if (tb == 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 initTb = initialization.resolveTypeExpecting(scope, tb);
- if (initTb != null) {
- ((ArrayInitializer) initialization).binding = (ArrayBinding) initTb;
- initialization.implicitWidening(tb, initTb);
- }
- } else {
- TypeBinding initTb = initialization.resolveType(scope);
- if (initTb != null) {
- if (initialization.isConstantValueOfTypeAssignableToType(initTb, tb)
- || (tb.isBaseType() && BaseTypeBinding.isWidening(tb.id, initTb.id))
- || BlockScope.areTypesCompatible(initTb, tb))
- initialization.implicitWidening(tb, initTb);
- else
- scope.problemReporter().typeMismatchError(initTb, tb, 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
- binding.constant =
- binding.isFinal()
- ? initialization.constant.castTo((tb.id << 4) + initialization.constant.typeID())
- : NotAConstant;
- }
- }
-
- public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
-
- if (visitor.visit(this, scope)) {
- type.traverse(visitor, scope);
- if (initialization != null)
- initialization.traverse(visitor, scope);
- }
- visitor.endVisit(this, scope);
- }
-}
\ No newline at end of file
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