+/*******************************************************************************
+ * Copyright (c) 2000, 2003 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 net.sourceforge.phpdt.internal.compiler.ast;
-/**
- * A ConditionalExpression is like that : booleanExpression ? trueValue : falseValue;
- * @author Matthieu Casanova
- */
+import net.sourceforge.phpdt.internal.compiler.ASTVisitor;
+import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
+import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
+import net.sourceforge.phpdt.internal.compiler.flow.UnconditionalFlowInfo;
+import net.sourceforge.phpdt.internal.compiler.impl.Constant;
+import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
+
public class ConditionalExpression extends OperatorExpression {
- public Expression condition, valueIfTrue, valueIfFalse;
-
- public ConditionalExpression(Expression condition,
- Expression valueIfTrue,
- Expression valueIfFalse) {
- super(-1, condition.sourceStart, valueIfFalse.sourceEnd);
- this.condition = condition;
- this.valueIfTrue = valueIfTrue;
- this.valueIfFalse = valueIfFalse;
- }
-
- public String toStringExpression() {
- final StringBuffer buff = new StringBuffer("(");
- buff.append(condition.toStringExpression());
- buff.append(") ? ");
- buff.append(valueIfTrue.toStringExpression());
- buff.append(" : ");
- buff.append(valueIfFalse.toStringExpression());
- return buff.toString();
- }
+ public Expression condition, valueIfTrue, valueIfFalse;
+ public Constant optimizedBooleanConstant;
+ public Constant optimizedIfTrueConstant;
+ public Constant optimizedIfFalseConstant;
+
+ private int returnTypeSlotSize = 1;
+
+ // for local variables table attributes
+ int trueInitStateIndex = -1;
+ int falseInitStateIndex = -1;
+ int mergedInitStateIndex = -1;
+
+ public ConditionalExpression(
+ Expression condition,
+ Expression valueIfTrue,
+ Expression valueIfFalse) {
+ this.condition = condition;
+ this.valueIfTrue = valueIfTrue;
+ this.valueIfFalse = valueIfFalse;
+ sourceStart = condition.sourceStart;
+ sourceEnd = valueIfFalse.sourceEnd;
+ }
+
+ public FlowInfo analyseCode(
+ BlockScope currentScope,
+ FlowContext flowContext,
+ FlowInfo flowInfo) {
+
+ Constant cst = this.condition.optimizedBooleanConstant();
+ boolean isConditionOptimizedTrue = cst != NotAConstant && cst.booleanValue() == true;
+ boolean isConditionOptimizedFalse = cst != NotAConstant && cst.booleanValue() == false;
+
+ int mode = flowInfo.reachMode();
+ flowInfo = condition.analyseCode(currentScope, flowContext, flowInfo, cst == NotAConstant);
+
+ // process the if-true part
+ FlowInfo trueFlowInfo = flowInfo.initsWhenTrue().copy();
+ if (isConditionOptimizedFalse) {
+ trueFlowInfo.setReachMode(FlowInfo.UNREACHABLE);
+ }
+ trueInitStateIndex = currentScope.methodScope().recordInitializationStates(trueFlowInfo);
+ trueFlowInfo = valueIfTrue.analyseCode(currentScope, flowContext, trueFlowInfo);
+
+ // process the if-false part
+ FlowInfo falseFlowInfo = flowInfo.initsWhenFalse().copy();
+ if (isConditionOptimizedTrue) {
+ falseFlowInfo.setReachMode(FlowInfo.UNREACHABLE);
+ }
+ falseInitStateIndex = currentScope.methodScope().recordInitializationStates(falseFlowInfo);
+ falseFlowInfo = valueIfFalse.analyseCode(currentScope, flowContext, falseFlowInfo);
+
+ // merge if-true & if-false initializations
+ FlowInfo mergedInfo;
+ if (isConditionOptimizedTrue){
+ mergedInfo = trueFlowInfo.addPotentialInitializationsFrom(falseFlowInfo);
+ } else if (isConditionOptimizedFalse) {
+ mergedInfo = falseFlowInfo.addPotentialInitializationsFrom(trueFlowInfo);
+ } else {
+ // merge using a conditional info - 1GK2BLM
+ // if ((t && (v = t)) ? t : t && (v = f)) r = v; -- ok
+ cst = this.optimizedIfTrueConstant;
+ boolean isValueIfTrueOptimizedTrue = cst != null && cst != NotAConstant && cst.booleanValue() == true;
+ boolean isValueIfTrueOptimizedFalse = cst != null && cst != NotAConstant && cst.booleanValue() == false;
+
+ cst = this.optimizedIfFalseConstant;
+ boolean isValueIfFalseOptimizedTrue = cst != null && cst != NotAConstant && cst.booleanValue() == true;
+ boolean isValueIfFalseOptimizedFalse = cst != null && cst != NotAConstant && cst.booleanValue() == false;
+
+ UnconditionalFlowInfo trueInfoWhenTrue = trueFlowInfo.initsWhenTrue().copy().unconditionalInits();
+ if (isValueIfTrueOptimizedFalse) trueInfoWhenTrue.setReachMode(FlowInfo.UNREACHABLE);
+
+ UnconditionalFlowInfo falseInfoWhenTrue = falseFlowInfo.initsWhenTrue().copy().unconditionalInits();
+ if (isValueIfFalseOptimizedFalse) falseInfoWhenTrue.setReachMode(FlowInfo.UNREACHABLE);
+
+ UnconditionalFlowInfo trueInfoWhenFalse = trueFlowInfo.initsWhenFalse().copy().unconditionalInits();
+ if (isValueIfTrueOptimizedTrue) trueInfoWhenFalse.setReachMode(FlowInfo.UNREACHABLE);
+
+ UnconditionalFlowInfo falseInfoWhenFalse = falseFlowInfo.initsWhenFalse().copy().unconditionalInits();
+ if (isValueIfFalseOptimizedTrue) falseInfoWhenFalse.setReachMode(FlowInfo.UNREACHABLE);
+
+ mergedInfo =
+ FlowInfo.conditional(
+ trueInfoWhenTrue.mergedWith(falseInfoWhenTrue),
+ trueInfoWhenFalse.mergedWith(falseInfoWhenFalse));
+ }
+ mergedInitStateIndex =
+ currentScope.methodScope().recordInitializationStates(mergedInfo);
+ mergedInfo.setReachMode(mode);
+ return mergedInfo;
+ }
+
+ /**
+ * Code generation for the conditional operator ?:
+ *
+ * @param currentScope net.sourceforge.phpdt.internal.compiler.lookup.BlockScope
+ * @param codeStream net.sourceforge.phpdt.internal.compiler.codegen.CodeStream
+ * @param valueRequired boolean
+ */
+// public void generateCode(
+// BlockScope currentScope,
+// CodeStream codeStream,
+// boolean valueRequired) {
+//
+// int pc = codeStream.position;
+// Label endifLabel, falseLabel;
+// if (constant != NotAConstant) {
+// if (valueRequired)
+// codeStream.generateConstant(constant, implicitConversion);
+// codeStream.recordPositionsFrom(pc, this.sourceStart);
+// return;
+// }
+// Constant cst = condition.constant;
+// Constant condCst = condition.optimizedBooleanConstant();
+// boolean needTruePart =
+// !(((cst != NotAConstant) && (cst.booleanValue() == false))
+// || ((condCst != NotAConstant) && (condCst.booleanValue() == false)));
+// boolean needFalsePart =
+// !(((cst != NotAConstant) && (cst.booleanValue() == true))
+// || ((condCst != NotAConstant) && (condCst.booleanValue() == true)));
+// endifLabel = new Label(codeStream);
+//
+// // Generate code for the condition
+// boolean needConditionValue = (cst == NotAConstant) && (condCst == NotAConstant);
+// condition.generateOptimizedBoolean(
+// currentScope,
+// codeStream,
+// null,
+// (falseLabel = new Label(codeStream)),
+// needConditionValue);
+//
+// if (trueInitStateIndex != -1) {
+// codeStream.removeNotDefinitelyAssignedVariables(
+// currentScope,
+// trueInitStateIndex);
+// codeStream.addDefinitelyAssignedVariables(currentScope, trueInitStateIndex);
+// }
+// // Then code generation
+// if (needTruePart) {
+// valueIfTrue.generateCode(currentScope, codeStream, valueRequired);
+// if (needFalsePart) {
+// // Jump over the else part
+// int position = codeStream.position;
+// codeStream.goto_(endifLabel);
+// codeStream.updateLastRecordedEndPC(position);
+// // Tune codestream stack size
+// if (valueRequired) {
+// codeStream.decrStackSize(returnTypeSlotSize);
+// }
+// }
+// }
+// if (needFalsePart) {
+// falseLabel.place();
+// if (falseInitStateIndex != -1) {
+// codeStream.removeNotDefinitelyAssignedVariables(
+// currentScope,
+// falseInitStateIndex);
+// codeStream.addDefinitelyAssignedVariables(currentScope, falseInitStateIndex);
+// }
+// valueIfFalse.generateCode(currentScope, codeStream, valueRequired);
+// // End of if statement
+// endifLabel.place();
+// }
+// // May loose some local variable initializations : affecting the local variable attributes
+// if (mergedInitStateIndex != -1) {
+// codeStream.removeNotDefinitelyAssignedVariables(
+// currentScope,
+// mergedInitStateIndex);
+// }
+// // implicit conversion
+// if (valueRequired)
+// codeStream.generateImplicitConversion(implicitConversion);
+// codeStream.recordPositionsFrom(pc, this.sourceStart);
+// }
+//
+// /**
+// * Optimized boolean code generation for the conditional operator ?:
+// */
+// public void generateOptimizedBoolean(
+// BlockScope currentScope,
+// CodeStream codeStream,
+// Label trueLabel,
+// Label falseLabel,
+// boolean valueRequired) {
+//
+// if ((constant != Constant.NotAConstant) && (constant.typeID() == T_boolean) // constant
+// || (valueIfTrue.implicitConversion >> 4) != T_boolean) { // non boolean values
+// super.generateOptimizedBoolean(currentScope, codeStream, trueLabel, falseLabel, valueRequired);
+// return;
+// }
+// Constant cst = condition.constant;
+// Constant condCst = condition.optimizedBooleanConstant();
+// boolean needTruePart =
+// !(((cst != NotAConstant) && (cst.booleanValue() == false))
+// || ((condCst != NotAConstant) && (condCst.booleanValue() == false)));
+// boolean needFalsePart =
+// !(((cst != NotAConstant) && (cst.booleanValue() == true))
+// || ((condCst != NotAConstant) && (condCst.booleanValue() == true)));
+//
+// Label internalFalseLabel, endifLabel = new Label(codeStream);
+//
+// // Generate code for the condition
+// boolean needConditionValue = (cst == NotAConstant) && (condCst == NotAConstant);
+// condition.generateOptimizedBoolean(
+// currentScope,
+// codeStream,
+// null,
+// internalFalseLabel = new Label(codeStream),
+// needConditionValue);
+//
+// if (trueInitStateIndex != -1) {
+// codeStream.removeNotDefinitelyAssignedVariables(
+// currentScope,
+// trueInitStateIndex);
+// codeStream.addDefinitelyAssignedVariables(currentScope, trueInitStateIndex);
+// }
+// // Then code generation
+// if (needTruePart) {
+// valueIfTrue.generateOptimizedBoolean(currentScope, codeStream, trueLabel, falseLabel, valueRequired);
+//
+// if (needFalsePart) {
+// // Jump over the else part
+// int position = codeStream.position;
+// codeStream.goto_(endifLabel);
+// codeStream.updateLastRecordedEndPC(position);
+// // No need to decrement codestream stack size
+// // since valueIfTrue was already consumed by branch bytecode
+// }
+// }
+// if (needFalsePart) {
+// internalFalseLabel.place();
+// if (falseInitStateIndex != -1) {
+// codeStream.removeNotDefinitelyAssignedVariables(
+// currentScope,
+// falseInitStateIndex);
+// codeStream.addDefinitelyAssignedVariables(currentScope, falseInitStateIndex);
+// }
+// valueIfFalse.generateOptimizedBoolean(currentScope, codeStream, trueLabel, falseLabel, valueRequired);
+//
+// // End of if statement
+// endifLabel.place();
+// }
+// // May loose some local variable initializations : affecting the local variable attributes
+// if (mergedInitStateIndex != -1) {
+// codeStream.removeNotDefinitelyAssignedVariables(
+// currentScope,
+// mergedInitStateIndex);
+// }
+// // no implicit conversion for boolean values
+// codeStream.updateLastRecordedEndPC(codeStream.position);
+// }
+//
+// public Constant optimizedBooleanConstant() {
+//
+// return this.optimizedBooleanConstant == null ? this.constant : this.optimizedBooleanConstant;
+// }
+//
+// public TypeBinding resolveType(BlockScope scope) {
+// // specs p.368
+// constant = NotAConstant;
+// TypeBinding conditionType = condition.resolveTypeExpecting(scope, BooleanBinding);
+// TypeBinding valueIfTrueType = valueIfTrue.resolveType(scope);
+// TypeBinding valueIfFalseType = valueIfFalse.resolveType(scope);
+// if (conditionType == null || valueIfTrueType == null || valueIfFalseType == null)
+// return null;
+//
+// // Propagate the constant value from the valueIfTrue and valueIFFalse expression if it is possible
+// Constant condConstant, trueConstant, falseConstant;
+// if ((condConstant = condition.constant) != NotAConstant
+// && (trueConstant = valueIfTrue.constant) != NotAConstant
+// && (falseConstant = valueIfFalse.constant) != NotAConstant) {
+// // all terms are constant expression so we can propagate the constant
+// // from valueIFTrue or valueIfFalse to teh receiver constant
+// constant = condConstant.booleanValue() ? trueConstant : falseConstant;
+// }
+// if (valueIfTrueType == valueIfFalseType) { // harmed the implicit conversion
+// valueIfTrue.implicitWidening(valueIfTrueType, valueIfTrueType);
+// valueIfFalse.implicitConversion = valueIfTrue.implicitConversion;
+// if (valueIfTrueType == LongBinding || valueIfTrueType == DoubleBinding) {
+// returnTypeSlotSize = 2;
+// }
+//
+// if (valueIfTrueType == BooleanBinding) {
+// this.optimizedIfTrueConstant = valueIfTrue.optimizedBooleanConstant();
+// this.optimizedIfFalseConstant = valueIfFalse.optimizedBooleanConstant();
+//
+// // Propagate the optimized boolean constant if possible
+// if ((condConstant = condition.optimizedBooleanConstant()) != NotAConstant) {
+//
+// this.optimizedBooleanConstant = condConstant.booleanValue()
+// ? optimizedIfTrueConstant
+// : optimizedIfFalseConstant;
+// }
+// }
+// return this.resolvedType = valueIfTrueType;
+// }
+// // Determine the return type depending on argument types
+// // Numeric types
+// if (valueIfTrueType.isNumericType() && valueIfFalseType.isNumericType()) {
+// // (Short x Byte) or (Byte x Short)"
+// if ((valueIfTrueType == ByteBinding && valueIfFalseType == ShortBinding)
+// || (valueIfTrueType == ShortBinding && valueIfFalseType == ByteBinding)) {
+// valueIfTrue.implicitWidening(ShortBinding, valueIfTrueType);
+// valueIfFalse.implicitWidening(ShortBinding, valueIfFalseType);
+// this.resolvedType = ShortBinding;
+// return ShortBinding;
+// }
+// // <Byte|Short|Char> x constant(Int) ---> <Byte|Short|Char> and reciprocally
+// if ((valueIfTrueType == ByteBinding || valueIfTrueType == ShortBinding || valueIfTrueType == CharBinding)
+// && (valueIfFalseType == IntBinding
+// && valueIfFalse.isConstantValueOfTypeAssignableToType(valueIfFalseType, valueIfTrueType))) {
+// valueIfTrue.implicitWidening(valueIfTrueType, valueIfTrueType);
+// valueIfFalse.implicitWidening(valueIfTrueType, valueIfFalseType);
+// this.resolvedType = valueIfTrueType;
+// return valueIfTrueType;
+// }
+// if ((valueIfFalseType == ByteBinding
+// || valueIfFalseType == ShortBinding
+// || valueIfFalseType == CharBinding)
+// && (valueIfTrueType == IntBinding
+// && valueIfTrue.isConstantValueOfTypeAssignableToType(valueIfTrueType, valueIfFalseType))) {
+// valueIfTrue.implicitWidening(valueIfFalseType, valueIfTrueType);
+// valueIfFalse.implicitWidening(valueIfFalseType, valueIfFalseType);
+// this.resolvedType = valueIfFalseType;
+// return valueIfFalseType;
+// }
+// // Manual binary numeric promotion
+// // int
+// if (BaseTypeBinding.isNarrowing(valueIfTrueType.id, T_int)
+// && BaseTypeBinding.isNarrowing(valueIfFalseType.id, T_int)) {
+// valueIfTrue.implicitWidening(IntBinding, valueIfTrueType);
+// valueIfFalse.implicitWidening(IntBinding, valueIfFalseType);
+// this.resolvedType = IntBinding;
+// return IntBinding;
+// }
+// // long
+// if (BaseTypeBinding.isNarrowing(valueIfTrueType.id, T_long)
+// && BaseTypeBinding.isNarrowing(valueIfFalseType.id, T_long)) {
+// valueIfTrue.implicitWidening(LongBinding, valueIfTrueType);
+// valueIfFalse.implicitWidening(LongBinding, valueIfFalseType);
+// returnTypeSlotSize = 2;
+// this.resolvedType = LongBinding;
+// return LongBinding;
+// }
+// // float
+// if (BaseTypeBinding.isNarrowing(valueIfTrueType.id, T_float)
+// && BaseTypeBinding.isNarrowing(valueIfFalseType.id, T_float)) {
+// valueIfTrue.implicitWidening(FloatBinding, valueIfTrueType);
+// valueIfFalse.implicitWidening(FloatBinding, valueIfFalseType);
+// this.resolvedType = FloatBinding;
+// return FloatBinding;
+// }
+// // double
+// valueIfTrue.implicitWidening(DoubleBinding, valueIfTrueType);
+// valueIfFalse.implicitWidening(DoubleBinding, valueIfFalseType);
+// returnTypeSlotSize = 2;
+// this.resolvedType = DoubleBinding;
+// return DoubleBinding;
+// }
+// // Type references (null null is already tested)
+// if ((valueIfTrueType.isBaseType() && valueIfTrueType != NullBinding)
+// || (valueIfFalseType.isBaseType() && valueIfFalseType != NullBinding)) {
+// scope.problemReporter().conditionalArgumentsIncompatibleTypes(
+// this,
+// valueIfTrueType,
+// valueIfFalseType);
+// return null;
+// }
+// if (valueIfFalseType.isCompatibleWith(valueIfTrueType)) {
+// valueIfTrue.implicitWidening(valueIfTrueType, valueIfTrueType);
+// valueIfFalse.implicitWidening(valueIfTrueType, valueIfFalseType);
+// this.resolvedType = valueIfTrueType;
+// return valueIfTrueType;
+// }
+// if (valueIfTrueType.isCompatibleWith(valueIfFalseType)) {
+// valueIfTrue.implicitWidening(valueIfFalseType, valueIfTrueType);
+// valueIfFalse.implicitWidening(valueIfFalseType, valueIfFalseType);
+// this.resolvedType = valueIfFalseType;
+// return valueIfFalseType;
+// }
+// scope.problemReporter().conditionalArgumentsIncompatibleTypes(
+// this,
+// valueIfTrueType,
+// valueIfFalseType);
+// return null;
+// }
+ public StringBuffer printExpressionNoParenthesis(int indent, StringBuffer output) {
+
+ condition.printExpression(indent, output).append(" ? "); //$NON-NLS-1$
+ valueIfTrue.printExpression(0, output).append(" : "); //$NON-NLS-1$
+ return valueIfFalse.printExpression(0, output);
+ }
+ public String toStringExpressionNoParenthesis() {
+ return condition.toStringExpression() + " ? " + //$NON-NLS-1$
+ valueIfTrue.toStringExpression() + " : " + //$NON-NLS-1$
+ valueIfFalse.toStringExpression();
+ }
+
+ public void traverse(ASTVisitor visitor, BlockScope scope) {
+ if (visitor.visit(this, scope)) {
+ condition.traverse(visitor, scope);
+ valueIfTrue.traverse(visitor, scope);
+ valueIfFalse.traverse(visitor, scope);
+ }
+ visitor.endVisit(this, scope);
+ }
}
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