/*******************************************************************************
- * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
+ * 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 v0.5
+ * 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-v05.html
+ * http://www.eclipse.org/legal/cpl-v10.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.*;
+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.impl.Constant;
+import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
+import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
public class IfStatement extends Statement {
-
- //this class represents the case of only one statement in
- //either else and/or then branches.
+
+ // this class represents the case of only one statement in
+ // either else and/or then branches.
public Expression condition;
+
public Statement thenStatement;
+
public Statement elseStatement;
+ public Expression[] elseifConditions;
+
+ public Statement[] elseifStatements;
+
+ public boolean checkUnreachable;
+
boolean thenExit;
// for local variables table attributes
int thenInitStateIndex = -1;
+
int elseInitStateIndex = -1;
+
int mergedInitStateIndex = -1;
- public IfStatement(
- Expression condition,
- Statement thenStatement,
- int s,
- int e) {
+ public IfStatement(Expression condition, Statement thenStatement, int s,
+ int e) {
this.condition = condition;
this.thenStatement = thenStatement;
sourceStart = s;
sourceEnd = e;
+ checkUnreachable = true;
}
- public IfStatement(
- Expression condition,
- Statement thenStatement,
- Statement elseStatement,
- int s,
- int e) {
+ public IfStatement(Expression condition, Statement thenStatement,
+ Statement elseStatement, int s, int e) {
this.condition = condition;
this.thenStatement = thenStatement;
this.elseStatement = elseStatement;
sourceEnd = e;
sourceStart = s;
+ checkUnreachable = true;
}
- public FlowInfo analyseCode(
- BlockScope currentScope,
- FlowContext flowContext,
- FlowInfo flowInfo) {
-
- FlowInfo thenFlowInfo, elseFlowInfo;
+ public FlowInfo analyseCode(BlockScope currentScope,
+ FlowContext flowContext, FlowInfo flowInfo) {
// process the condition
flowInfo = condition.analyseCode(currentScope, flowContext, flowInfo);
+ Constant cst = this.condition.optimizedBooleanConstant();
+ boolean isConditionOptimizedTrue = cst != NotAConstant
+ && cst.booleanValue() == true;
+ boolean isConditionOptimizedFalse = cst != NotAConstant
+ && cst.booleanValue() == false;
+
// process the THEN part
- if (thenStatement == null) {
- thenFlowInfo = flowInfo.initsWhenTrue();
- } else {
- Constant cst;
- thenFlowInfo =
- ((((cst = condition.constant) != NotAConstant)
- && (cst.booleanValue() == false))
- || (((cst = condition.conditionalConstant()) != NotAConstant)
- && (cst.booleanValue() == false)))
- ? (flowInfo.initsWhenTrue().copy().markAsFakeReachable(true))
- : flowInfo.initsWhenTrue().copy();
+ FlowInfo thenFlowInfo = flowInfo.initsWhenTrue().copy();
+ if (isConditionOptimizedFalse) {
+ thenFlowInfo.setReachMode(FlowInfo.UNREACHABLE);
+ }
+ if (this.thenStatement != null) {
// Save info for code gen
- thenInitStateIndex =
- currentScope.methodScope().recordInitializationStates(thenFlowInfo);
- if (!thenFlowInfo.complainIfUnreachable(thenStatement, currentScope)) {
- thenFlowInfo =
- thenStatement.analyseCode(currentScope, flowContext, thenFlowInfo);
+ thenInitStateIndex = currentScope.methodScope()
+ .recordInitializationStates(thenFlowInfo);
+ if (!thenFlowInfo.complainIfUnreachable(thenStatement,
+ currentScope, false)) {
+ thenFlowInfo = thenStatement.analyseCode(currentScope,
+ flowContext, thenFlowInfo);
}
- };
+ }
+ ;
// optimizing the jump around the ELSE part
- thenExit = (thenFlowInfo == FlowInfo.DeadEnd) || thenFlowInfo.isFakeReachable();
+ this.thenExit = !thenFlowInfo.isReachable();
// process the ELSE part
- if (elseStatement == null) {
- elseFlowInfo = flowInfo.initsWhenFalse();
- } else {
- Constant cst;
- elseFlowInfo =
- ((((cst = condition.constant) != NotAConstant) && (cst.booleanValue() == true))
- || (((cst = condition.conditionalConstant()) != NotAConstant)
- && (cst.booleanValue() == true)))
- ? (flowInfo.initsWhenFalse().copy().markAsFakeReachable(true))
- : flowInfo.initsWhenFalse().copy();
+ FlowInfo elseFlowInfo = flowInfo.initsWhenFalse().copy();
+ if (isConditionOptimizedTrue) {
+ elseFlowInfo.setReachMode(FlowInfo.UNREACHABLE);
+ }
+ if (this.elseStatement != null) {
// Save info for code gen
- elseInitStateIndex =
- currentScope.methodScope().recordInitializationStates(elseFlowInfo);
- if (!elseFlowInfo.complainIfUnreachable(elseStatement, currentScope)) {
- elseFlowInfo =
- elseStatement.analyseCode(currentScope, flowContext, elseFlowInfo);
+ elseInitStateIndex = currentScope.methodScope()
+ .recordInitializationStates(elseFlowInfo);
+ if (!elseFlowInfo.complainIfUnreachable(elseStatement,
+ currentScope, false)) {
+ elseFlowInfo = elseStatement.analyseCode(currentScope,
+ flowContext, elseFlowInfo);
}
}
+ boolean elseExit = !elseFlowInfo.isReachable();
+
// merge THEN & ELSE initializations
FlowInfo mergedInfo;
- if ((condition.constant != NotAConstant)
- && (condition.constant.booleanValue() == true)) {
- // IF (TRUE)
- if (thenExit) {
- mergedInfo = elseFlowInfo.markAsFakeReachable(true);
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(mergedInfo);
- return mergedInfo;
+ // if (isConditionOptimizedTrue){
+ // if (!this.thenExit) {
+ // mergedInfo = thenFlowInfo;
+ // } else {
+ // mergedInfo = elseFlowInfo.setReachMode(FlowInfo.UNREACHABLE);
+ // }
+ //
+ // } else if (isConditionOptimizedFalse) {
+ // if (!elseExit) {
+ // mergedInfo = elseFlowInfo;
+ // } else {
+ // mergedInfo = thenFlowInfo.setReachMode(FlowInfo.UNREACHABLE);
+ // }
+ //
+ // } else {
+ // mergedInfo =
+ // thenFlowInfo.mergedWith(elseFlowInfo.unconditionalInits());
+ // }
+ if (isConditionOptimizedTrue) {
+ if (!this.thenExit) {
+ mergedInfo = thenFlowInfo
+ .addPotentialInitializationsFrom(elseFlowInfo);
} else {
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(thenFlowInfo);
- return thenFlowInfo;
+ mergedInfo = elseFlowInfo.setReachMode(FlowInfo.UNREACHABLE);
}
- } else {
- // IF (FALSE)
- if ((condition.constant != NotAConstant)
- && (condition.constant.booleanValue() == false)) {
- if (elseFlowInfo.isDeadEnd()) {
- mergedInfo = thenFlowInfo.markAsFakeReachable(true);
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(mergedInfo);
- return mergedInfo;
- } else {
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(elseFlowInfo);
- return elseFlowInfo;
- }
+
+ } else if (isConditionOptimizedFalse) {
+ if (!elseExit) {
+ mergedInfo = elseFlowInfo
+ .addPotentialInitializationsFrom(thenFlowInfo);
+ } else {
+ mergedInfo = thenFlowInfo.setReachMode(FlowInfo.UNREACHABLE);
}
+
+ } else {
+ mergedInfo = thenFlowInfo.mergedWith(elseFlowInfo
+ .unconditionalInits());
}
- mergedInfo = thenFlowInfo.mergedWith(elseFlowInfo.unconditionalInits());
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(mergedInfo);
+
+ mergedInitStateIndex = currentScope.methodScope()
+ .recordInitializationStates(mergedInfo);
return mergedInfo;
}
/**
* If code generation
- *
- * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
- * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
+ *
+ * @param currentScope
+ * net.sourceforge.phpdt.internal.compiler.lookup.BlockScope
+ * @param codeStream
+ * net.sourceforge.phpdt.internal.compiler.codegen.CodeStream
*/
- public void generateCode(BlockScope currentScope, CodeStream codeStream) {
+ // public void generateCode(BlockScope currentScope, CodeStream codeStream)
+ // {
+ //
+ // if ((this.bits & IsReachableMASK) == 0) {
+ // return;
+ // }
+ // int pc = codeStream.position;
+ // Label endifLabel = new Label(codeStream);
+ //
+ // // optimizing the then/else part code gen
+ // Constant cst;
+ // boolean hasThenPart =
+ // !(((cst = this.condition.optimizedBooleanConstant()) != NotAConstant
+ // && cst.booleanValue() == false)
+ // || this.thenStatement == null
+ // || this.thenStatement.isEmptyBlock());
+ // boolean hasElsePart =
+ // !((cst != NotAConstant && cst.booleanValue() == true)
+ // || this.elseStatement == null
+ // || this.elseStatement.isEmptyBlock());
+ //
+ // if (hasThenPart) {
+ // Label falseLabel;
+ // // generate boolean condition
+ // this.condition.generateOptimizedBoolean(
+ // currentScope,
+ // codeStream,
+ // null,
+ // (falseLabel = new Label(codeStream)),
+ // true);
+ // // May loose some local variable initializations : affecting the local
+ // variable attributes
+ // if (thenInitStateIndex != -1) {
+ // codeStream.removeNotDefinitelyAssignedVariables(
+ // currentScope,
+ // thenInitStateIndex);
+ // codeStream.addDefinitelyAssignedVariables(currentScope,
+ // thenInitStateIndex);
+ // }
+ // // generate then statement
+ // this.thenStatement.generateCode(currentScope, codeStream);
+ // // jump around the else statement
+ // if (hasElsePart && !thenExit) {
+ // this.thenStatement.branchChainTo(endifLabel);
+ // int position = codeStream.position;
+ // codeStream.goto_(endifLabel);
+ // codeStream.updateLastRecordedEndPC(position);
+ // //goto is tagged as part of the thenAction block
+ // }
+ // falseLabel.place();
+ // } else {
+ // if (hasElsePart) {
+ // // generate boolean condition
+ // this.condition.generateOptimizedBoolean(
+ // currentScope,
+ // codeStream,
+ // endifLabel,
+ // null,
+ // true);
+ // } else {
+ // // generate condition side-effects
+ // this.condition.generateCode(currentScope, codeStream, false);
+ // codeStream.recordPositionsFrom(pc, this.sourceStart);
+ // }
+ // }
+ // // generate else statement
+ // if (hasElsePart) {
+ // // May loose some local variable initializations : affecting the local
+ // variable attributes
+ // if (elseInitStateIndex != -1) {
+ // codeStream.removeNotDefinitelyAssignedVariables(
+ // currentScope,
+ // elseInitStateIndex);
+ // codeStream.addDefinitelyAssignedVariables(currentScope,
+ // elseInitStateIndex);
+ // }
+ // this.elseStatement.generateCode(currentScope, codeStream);
+ // }
+ // endifLabel.place();
+ // // May loose some local variable initializations : affecting the local
+ // variable attributes
+ // if (mergedInitStateIndex != -1) {
+ // codeStream.removeNotDefinitelyAssignedVariables(
+ // currentScope,
+ // mergedInitStateIndex);
+ // }
+ // codeStream.recordPositionsFrom(pc, this.sourceStart);
+ // }
+ public StringBuffer printStatement(int indent, StringBuffer output) {
- if ((bits & IsReachableMASK) == 0) {
- return;
- }
- int pc = codeStream.position;
- Label endifLabel = new Label(codeStream);
-
- // optimizing the then/else part code gen
- Constant cst, condCst;
- boolean hasThenPart =
- !((((cst = condition.constant) != NotAConstant)
- && (cst.booleanValue() == false))
- || (thenStatement == null)
- || (thenStatement.isEmptyBlock())
- || (((condCst = condition.conditionalConstant()) != NotAConstant)
- && (condCst.booleanValue() == false)));
- boolean hasElsePart =
- !(((cst != NotAConstant) && (cst.booleanValue() == true))
- || (elseStatement == null)
- || (elseStatement.isEmptyBlock())
- || (((condCst = condition.conditionalConstant()) != NotAConstant)
- && (condCst.booleanValue() == true)));
-
- if (hasThenPart) {
- Label falseLabel;
- // generate boolean condition
- condition.generateOptimizedBoolean(
- currentScope,
- codeStream,
- null,
- (falseLabel = new Label(codeStream)),
- true);
- // May loose some local variable initializations : affecting the local variable attributes
- if (thenInitStateIndex != -1) {
- codeStream.removeNotDefinitelyAssignedVariables(
- currentScope,
- thenInitStateIndex);
- codeStream.addDefinitelyAssignedVariables(currentScope, thenInitStateIndex);
- }
- // generate then statement
- thenStatement.generateCode(currentScope, codeStream);
- // jump around the else statement
- if (hasElsePart && !thenExit) {
- thenStatement.branchChainTo(endifLabel);
- int position = codeStream.position;
- codeStream.goto_(endifLabel);
- codeStream.updateLastRecordedEndPC(position);
- //goto is tagged as part of the thenAction block
- }
- falseLabel.place();
- } else {
- if (hasElsePart) {
- // generate boolean condition
- condition.generateOptimizedBoolean(
- currentScope,
- codeStream,
- endifLabel,
- null,
- true);
- } else {
- // generate condition side-effects
- condition.generateCode(currentScope, codeStream, false);
- codeStream.recordPositionsFrom(pc, this.sourceStart);
- }
- }
- // generate else statement
- if (hasElsePart) {
- // May loose some local variable initializations : affecting the local variable attributes
- if (elseInitStateIndex != -1) {
- codeStream.removeNotDefinitelyAssignedVariables(
- currentScope,
- elseInitStateIndex);
- codeStream.addDefinitelyAssignedVariables(currentScope, elseInitStateIndex);
- }
- elseStatement.generateCode(currentScope, codeStream);
- }
- endifLabel.place();
- // May loose some local variable initializations : affecting the local variable attributes
- if (mergedInitStateIndex != -1) {
- codeStream.removeNotDefinitelyAssignedVariables(
- currentScope,
- mergedInitStateIndex);
+ printIndent(indent, output).append("if ("); //$NON-NLS-1$
+ condition.printExpression(0, output).append(")\n"); //$NON-NLS-1$
+ thenStatement.printStatement(indent + 2, output);
+ if (elseStatement != null) {
+ output.append('\n');
+ printIndent(indent, output);
+ output.append("else\n"); //$NON-NLS-1$
+ elseStatement.printStatement(indent + 2, output);
}
- codeStream.recordPositionsFrom(pc, this.sourceStart);
+ return output;
}
public void resolve(BlockScope scope) {
- TypeBinding type = condition.resolveTypeExpecting(scope, BooleanBinding);
+ TypeBinding type = condition
+ .resolveTypeExpecting(scope, BooleanBinding);
condition.implicitWidening(type, type);
if (thenStatement != null)
thenStatement.resolve(scope);
String inFront, s = tabString(tab);
inFront = s;
- s = s + "if (" + condition.toStringExpression() + ") \n"; //$NON-NLS-1$ //$NON-NLS-2$
+ s = s + "if (" + condition.toStringExpression() + ") \n"; //$NON-NLS-1$ //$NON-NLS-2$
s = s + thenStatement.toString(tab + 2) + ";"; //$NON-NLS-1$
if (elseStatement != null)
- s = s + "\n" + inFront + "else\n" + elseStatement.toString(tab + 2) + ";"; //$NON-NLS-2$ //$NON-NLS-1$ //$NON-NLS-3$
+ s = s
+ + "\n" + inFront + "else\n" + elseStatement.toString(tab + 2) + ";"; //$NON-NLS-2$ //$NON-NLS-1$ //$NON-NLS-3$
return s;
}
- public void traverse(
- IAbstractSyntaxTreeVisitor visitor,
- BlockScope blockScope) {
+ public void traverse(ASTVisitor visitor, BlockScope blockScope) {
if (visitor.visit(this, blockScope)) {
condition.traverse(visitor, blockScope);
}
visitor.endVisit(this, blockScope);
}
-}
\ No newline at end of file
+}
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