+++ /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.codegen.Label;
-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.BaseTypeBinding;
-import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
-import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
-
-public class ConditionalExpression extends OperatorExpression {
-
- public Expression condition, valueIfTrue, valueIfFalse;
- private int returnTypeSlotSize = 1;
-
- // for local variables table attributes
- int thenInitStateIndex = -1;
- int elseInitStateIndex = -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 conditionConstant = condition.conditionalConstant();
-
- flowInfo = condition.analyseCode(currentScope, flowContext, flowInfo, conditionConstant == NotAConstant);
-
- if (conditionConstant != NotAConstant) {
- if (conditionConstant.booleanValue() == true) {
- // TRUE ? left : right
- FlowInfo resultInfo =
- valueIfTrue.analyseCode(currentScope, flowContext, flowInfo.initsWhenTrue().unconditionalInits());
- // analyse valueIfFalse, but do not take into account any of its infos
- valueIfFalse.analyseCode(
- currentScope,
- flowContext,
- flowInfo.initsWhenFalse().copy().unconditionalInits().markAsFakeReachable(true));
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(resultInfo);
- return resultInfo;
- } else {
- // FALSE ? left : right
- // analyse valueIfTrue, but do not take into account any of its infos
- valueIfTrue.analyseCode(
- currentScope,
- flowContext,
- flowInfo.initsWhenTrue().copy().unconditionalInits().markAsFakeReachable(true));
- FlowInfo mergeInfo =
- valueIfFalse.analyseCode(currentScope, flowContext, flowInfo.initsWhenFalse().unconditionalInits());
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(mergeInfo);
- return mergeInfo;
- }
- }
-
- // store a copy of the merged info, so as to compute the local variable attributes afterwards
- FlowInfo trueInfo = flowInfo.initsWhenTrue();
- thenInitStateIndex =
- currentScope.methodScope().recordInitializationStates(trueInfo);
- FlowInfo falseInfo = flowInfo.initsWhenFalse();
- elseInitStateIndex =
- currentScope.methodScope().recordInitializationStates(falseInfo);
-
- // propagate analysis
- trueInfo = valueIfTrue.analyseCode(currentScope, flowContext, trueInfo.copy());
- falseInfo =
- valueIfFalse.analyseCode(currentScope, flowContext, falseInfo.copy());
-
- // merge back using a conditional info - 1GK2BLM
- // if ((t && (v = t)) ? t : t && (v = f)) r = v; -- ok
- FlowInfo mergedInfo =
- FlowInfo.conditional(
- trueInfo.initsWhenTrue().copy().unconditionalInits().mergedWith( // must copy, since could be shared with trueInfo.initsWhenFalse()...
- falseInfo.initsWhenTrue().copy().unconditionalInits()),
- trueInfo.initsWhenFalse().unconditionalInits().mergedWith(
- falseInfo.initsWhenFalse().unconditionalInits()));
- /*
- FlowInfo mergedInfo = valueIfTrue.analyseCode(
- currentScope,
- flowContext,
- flowInfo.initsWhenTrue().copy()).
- unconditionalInits().
- mergedWith(
- valueIfFalse.analyseCode(
- currentScope,
- flowContext,
- flowInfo.initsWhenFalse().copy()).
- unconditionalInits());
- */
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(mergedInfo);
- return mergedInfo;
- }
-
- /**
- * Code generation for the conditional operator ?:
- *
- * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
- * @param codeStream org.eclipse.jdt.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.conditionalConstant();
- 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 (thenInitStateIndex != -1) {
- codeStream.removeNotDefinitelyAssignedVariables(
- currentScope,
- thenInitStateIndex);
- codeStream.addDefinitelyAssignedVariables(currentScope, thenInitStateIndex);
- }
- // 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 (elseInitStateIndex != -1) {
- codeStream.removeNotDefinitelyAssignedVariables(
- currentScope,
- elseInitStateIndex);
- codeStream.addDefinitelyAssignedVariables(currentScope, elseInitStateIndex);
- }
- 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;
- }
- int pc = codeStream.position;
- Constant cst = condition.constant;
- Constant condCst = condition.conditionalConstant();
- 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 (thenInitStateIndex != -1) {
- codeStream.removeNotDefinitelyAssignedVariables(
- currentScope,
- thenInitStateIndex);
- codeStream.addDefinitelyAssignedVariables(currentScope, thenInitStateIndex);
- }
- // 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);
- // Tune codestream stack size
- //if (valueRequired) {
- // codeStream.decrStackSize(returnTypeSlotSize);
- //}
- }
- }
- if (needFalsePart) {
- internalFalseLabel.place();
- if (elseInitStateIndex != -1) {
- codeStream.removeNotDefinitelyAssignedVariables(
- currentScope,
- elseInitStateIndex);
- codeStream.addDefinitelyAssignedVariables(currentScope, elseInitStateIndex);
- }
- 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.recordPositionsFrom(pc, this.sourceStart);
- }
-
- 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
- if (condition.constant != NotAConstant
- && valueIfTrue.constant != NotAConstant
- && valueIfFalse.constant != NotAConstant) {
- // all terms are constant expression so we can propagate the constant
- // from valueIFTrue or valueIfFalse to teh receiver constant
- constant =
- (condition.constant.booleanValue())
- ? valueIfTrue.constant
- : valueIfFalse.constant;
- }
- if (valueIfTrueType == valueIfFalseType) { // harmed the implicit conversion
- valueIfTrue.implicitWidening(valueIfTrueType, valueIfTrueType);
- valueIfFalse.implicitConversion = valueIfTrue.implicitConversion;
- if (valueIfTrueType == LongBinding || valueIfTrueType == DoubleBinding) {
- returnTypeSlotSize = 2;
- }
- this.typeBinding = valueIfTrueType;
- return 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.typeBinding = 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.typeBinding = 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.typeBinding = 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.typeBinding = 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.typeBinding = 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.typeBinding = FloatBinding;
- return FloatBinding;
- }
- // double
- valueIfTrue.implicitWidening(DoubleBinding, valueIfTrueType);
- valueIfFalse.implicitWidening(DoubleBinding, valueIfFalseType);
- returnTypeSlotSize = 2;
- this.typeBinding = 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 (BlockScope.areTypesCompatible(valueIfFalseType, valueIfTrueType)) {
- valueIfTrue.implicitWidening(valueIfTrueType, valueIfTrueType);
- valueIfFalse.implicitWidening(valueIfTrueType, valueIfFalseType);
- this.typeBinding = valueIfTrueType;
- return valueIfTrueType;
- }
- if (BlockScope.areTypesCompatible(valueIfTrueType, valueIfFalseType)) {
- valueIfTrue.implicitWidening(valueIfFalseType, valueIfTrueType);
- valueIfFalse.implicitWidening(valueIfFalseType, valueIfFalseType);
- this.typeBinding = valueIfFalseType;
- return valueIfFalseType;
- }
- scope.problemReporter().conditionalArgumentsIncompatibleTypes(
- this,
- valueIfTrueType,
- valueIfFalseType);
- return null;
- }
-
- public String toStringExpressionNoParenthesis() {
- return condition.toStringExpression() + " ? " + //$NON-NLS-1$
- valueIfTrue.toStringExpression() + " : " + //$NON-NLS-1$
- valueIfFalse.toStringExpression();
- }
-
- public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
- if (visitor.visit(this, scope)) {
- condition.traverse(visitor, scope);
- valueIfTrue.traverse(visitor, scope);
- valueIfFalse.traverse(visitor, scope);
- }
- visitor.endVisit(this, scope);
- }
-}
\ No newline at end of file
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