--- /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.impl.*;
+import net.sourceforge.phpdt.internal.compiler.codegen.*;
+import net.sourceforge.phpdt.internal.compiler.flow.*;
+import net.sourceforge.phpdt.internal.compiler.lookup.*;
+
+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))
+ || scope.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);
+ }
+}
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