+++ /dev/null
-/*******************************************************************************
- * 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.phpeclipse.internal.compiler.ast;
-
-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 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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