/*******************************************************************************
- * 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.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.codegen.Label;
+import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
+import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
+import net.sourceforge.phpdt.internal.compiler.flow.LoopingFlowContext;
+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 ForStatement extends Statement {
-
+
public Statement[] initializations;
+
public Expression condition;
+
public Statement[] increments;
+
public Statement action;
- //when there is no local declaration, there is no need of a new scope
- //scope is positionned either to a new scope, or to the "upper"scope (see resolveType)
+ // when there is no local declaration, there is no need of a new scope
+ // scope is positionned either to a new scope, or to the "upper"scope (see
+ // resolveType)
public boolean neededScope;
+
public BlockScope scope;
private Label breakLabel, continueLabel;
// for local variables table attributes
int preCondInitStateIndex = -1;
+
int condIfTrueInitStateIndex = -1;
+
int mergedInitStateIndex = -1;
- public ForStatement(
- Statement[] initializations,
- Expression condition,
- Statement[] increments,
- Statement action,
- boolean neededScope,
- int s,
- int e) {
+ public ForStatement(Statement[] initializations, Expression condition,
+ Statement[] increments, Statement action, boolean neededScope,
+ int s, int e) {
this.sourceStart = s;
this.sourceEnd = e;
this.neededScope = neededScope;
}
- public FlowInfo analyseCode(
- BlockScope currentScope,
- FlowContext flowContext,
- FlowInfo flowInfo) {
-
+ public FlowInfo analyseCode(BlockScope currentScope,
+ FlowContext flowContext, FlowInfo flowInfo) {
+
breakLabel = new Label();
continueLabel = new Label();
if (initializations != null) {
int count = initializations.length, i = 0;
while (i < count) {
- flowInfo = initializations[i++].analyseCode(scope, flowContext, flowInfo);
+ flowInfo = initializations[i++].analyseCode(scope, flowContext,
+ flowInfo);
}
}
- preCondInitStateIndex =
- currentScope.methodScope().recordInitializationStates(flowInfo);
-
- boolean conditionIsInlinedToTrue =
- condition == null || (condition.constant != NotAConstant && condition.constant.booleanValue() == true);
- boolean conditionIsInlinedToFalse =
- ! conditionIsInlinedToTrue && (condition.constant != NotAConstant && condition.constant.booleanValue() == false);
-
+ preCondInitStateIndex = currentScope.methodScope()
+ .recordInitializationStates(flowInfo);
+
+ Constant cst = this.condition == null ? null : this.condition.constant;
+ boolean isConditionTrue = cst == null
+ || (cst != NotAConstant && cst.booleanValue() == true);
+ boolean isConditionFalse = cst != null
+ && (cst != NotAConstant && cst.booleanValue() == false);
+
+ cst = this.condition == null ? null : this.condition
+ .optimizedBooleanConstant();
+ boolean isConditionOptimizedTrue = cst == null
+ || (cst != NotAConstant && cst.booleanValue() == true);
+ boolean isConditionOptimizedFalse = cst != null
+ && (cst != NotAConstant && cst.booleanValue() == false);
+
// process the condition
LoopingFlowContext condLoopContext = null;
if (condition != null) {
- if (!conditionIsInlinedToTrue) {
- flowInfo =
- condition.analyseCode(
- scope,
- (condLoopContext =
- new LoopingFlowContext(flowContext, this, null, null, scope)),
- flowInfo);
+ if (!isConditionTrue) {
+ flowInfo = condition.analyseCode(scope,
+ (condLoopContext = new LoopingFlowContext(flowContext,
+ this, null, null, scope)), flowInfo);
}
}
// process the action
LoopingFlowContext loopingContext;
FlowInfo actionInfo;
- if ((action == null) || action.isEmptyBlock()) {
+ if (action == null) {
+ // || (action.isEmptyBlock() &&
+ // currentScope.environment().options.complianceLevel <=
+ // CompilerOptions.JDK1_3)) {
if (condLoopContext != null)
- condLoopContext.complainOnFinalAssignmentsInLoop(scope, flowInfo);
- if (conditionIsInlinedToTrue) {
- return FlowInfo.DeadEnd;
+ condLoopContext.complainOnFinalAssignmentsInLoop(scope,
+ flowInfo);
+ if (isConditionTrue) {
+ return FlowInfo.DEAD_END;
} else {
- if (conditionIsInlinedToFalse){
+ if (isConditionFalse) {
continueLabel = null; // for(;false;p());
}
actionInfo = flowInfo.initsWhenTrue().copy();
- loopingContext =
- new LoopingFlowContext(flowContext, this, breakLabel, continueLabel, scope);
+ loopingContext = new LoopingFlowContext(flowContext, this,
+ breakLabel, continueLabel, scope);
}
} else {
- loopingContext =
- new LoopingFlowContext(flowContext, this, breakLabel, continueLabel, scope);
+ loopingContext = new LoopingFlowContext(flowContext, this,
+ breakLabel, continueLabel, scope);
FlowInfo initsWhenTrue = flowInfo.initsWhenTrue();
- condIfTrueInitStateIndex =
- currentScope.methodScope().recordInitializationStates(initsWhenTrue);
-
- actionInfo = conditionIsInlinedToFalse
- ? FlowInfo.DeadEnd // unreachable when condition inlined to false
- : initsWhenTrue.copy();
- if (!actionInfo.complainIfUnreachable(action, scope)) {
- actionInfo = action.analyseCode(scope, loopingContext, actionInfo);
+ condIfTrueInitStateIndex = currentScope.methodScope()
+ .recordInitializationStates(initsWhenTrue);
+
+ if (isConditionFalse) {
+ actionInfo = FlowInfo.DEAD_END;
+ } else {
+ actionInfo = initsWhenTrue.copy();
+ if (isConditionOptimizedFalse) {
+ actionInfo.setReachMode(FlowInfo.UNREACHABLE);
+ }
+ }
+ if (!actionInfo.complainIfUnreachable(action, scope, false)) {
+ actionInfo = action.analyseCode(scope, loopingContext,
+ actionInfo);
}
- // code generation can be optimized when no need to continue in the loop
- if (((actionInfo == FlowInfo.DeadEnd) || actionInfo.isFakeReachable())
- && ((loopingContext.initsOnContinue == FlowInfo.DeadEnd)
- || loopingContext.initsOnContinue.isFakeReachable())) {
+ // code generation can be optimized when no need to continue in the
+ // loop
+ if (!actionInfo.isReachable()
+ && !loopingContext.initsOnContinue.isReachable()) {
continueLabel = null;
} else {
if (condLoopContext != null)
- condLoopContext.complainOnFinalAssignmentsInLoop(scope, flowInfo);
- loopingContext.complainOnFinalAssignmentsInLoop(scope, actionInfo);
- actionInfo =
- actionInfo.mergedWith(loopingContext.initsOnContinue.unconditionalInits());
+ condLoopContext.complainOnFinalAssignmentsInLoop(scope,
+ flowInfo);
+ loopingContext.complainOnFinalAssignmentsInLoop(scope,
+ actionInfo);
+ actionInfo = actionInfo
+ .mergedWith(loopingContext.initsOnContinue
+ .unconditionalInits());
// for increments
}
}
if ((continueLabel != null) && (increments != null)) {
- LoopingFlowContext loopContext =
- new LoopingFlowContext(flowContext, this, null, null, scope);
+ LoopingFlowContext loopContext = new LoopingFlowContext(
+ flowContext, this, null, null, scope);
int i = 0, count = increments.length;
while (i < count)
- actionInfo = increments[i++].analyseCode(scope, loopContext, actionInfo);
- loopContext.complainOnFinalAssignmentsInLoop(scope, flowInfo);
+ actionInfo = increments[i++].analyseCode(scope, loopContext,
+ actionInfo);
+ loopContext.complainOnFinalAssignmentsInLoop(scope, actionInfo);
}
// infinite loop
FlowInfo mergedInfo;
- if (conditionIsInlinedToTrue) {
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(
- mergedInfo = loopingContext.initsOnBreak);
+ if (isConditionOptimizedTrue) {
+ mergedInitStateIndex = currentScope.methodScope()
+ .recordInitializationStates(
+ mergedInfo = loopingContext.initsOnBreak);
return mergedInfo;
}
- //end of loop: either condition false or break
- mergedInfo =
- flowInfo.initsWhenFalse().unconditionalInits().mergedWith(
+ // end of loop: either condition false or break
+ mergedInfo = flowInfo.initsWhenFalse().unconditionalInits().mergedWith(
loopingContext.initsOnBreak.unconditionalInits());
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(mergedInfo);
+ if (isConditionOptimizedTrue && continueLabel == null) {
+ mergedInfo.setReachMode(FlowInfo.UNREACHABLE);
+ }
+ mergedInitStateIndex = currentScope.methodScope()
+ .recordInitializationStates(mergedInfo);
return mergedInfo;
}
/**
* For statement 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) {
-
- if ((bits & IsReachableMASK) == 0) {
- return;
- }
- int pc = codeStream.position;
-
- // generate the initializations
- if (initializations != null) {
- for (int i = 0, max = initializations.length; i < max; i++) {
- initializations[i].generateCode(scope, codeStream);
- }
- }
-
- // label management
- Label actionLabel = new Label(codeStream);
- Label conditionLabel = new Label(codeStream);
- breakLabel.codeStream = codeStream;
- if (continueLabel != null) {
- continueLabel.codeStream = codeStream;
- }
- // jump over the actionBlock
- if ((condition != null)
- && (condition.constant == NotAConstant)
- && !((action == null || action.isEmptyBlock()) && (increments == null))) {
- int jumpPC = codeStream.position;
- codeStream.goto_(conditionLabel);
- codeStream.recordPositionsFrom(jumpPC, condition.sourceStart);
- }
- // generate the loop action
- actionLabel.place();
- if (action != null) {
- // Required to fix 1PR0XVS: LFRE:WINNT - Compiler: variable table for method appears incorrect
- if (condIfTrueInitStateIndex != -1) {
- // insert all locals initialized inside the condition into the action generated prior to the condition
- codeStream.addDefinitelyAssignedVariables(
- currentScope,
- condIfTrueInitStateIndex);
- }
- action.generateCode(scope, codeStream);
+ // public void generateCode(BlockScope currentScope, CodeStream codeStream)
+ // {
+ //
+ // if ((bits & IsReachableMASK) == 0) {
+ // return;
+ // }
+ // int pc = codeStream.position;
+ //
+ // // generate the initializations
+ // if (initializations != null) {
+ // for (int i = 0, max = initializations.length; i < max; i++) {
+ // initializations[i].generateCode(scope, codeStream);
+ // }
+ // }
+ //
+ // // label management
+ // Label actionLabel = new Label(codeStream);
+ // Label conditionLabel = new Label(codeStream);
+ // breakLabel.codeStream = codeStream;
+ // if (continueLabel != null) {
+ // continueLabel.codeStream = codeStream;
+ // }
+ // // jump over the actionBlock
+ // if ((condition != null)
+ // && (condition.constant == NotAConstant)
+ // && !((action == null || action.isEmptyBlock()) && (increments == null)))
+ // {
+ // int jumpPC = codeStream.position;
+ // codeStream.goto_(conditionLabel);
+ // codeStream.recordPositionsFrom(jumpPC, condition.sourceStart);
+ // }
+ // // generate the loop action
+ // actionLabel.place();
+ // if (action != null) {
+ // // Required to fix 1PR0XVS: LFRE:WINNT - Compiler: variable table for
+ // method appears incorrect
+ // if (condIfTrueInitStateIndex != -1) {
+ // // insert all locals initialized inside the condition into the action
+ // generated prior to the condition
+ // codeStream.addDefinitelyAssignedVariables(
+ // currentScope,
+ // condIfTrueInitStateIndex);
+ // }
+ // action.generateCode(scope, codeStream);
+ // }
+ // // continuation point
+ // if (continueLabel != null) {
+ // continueLabel.place();
+ // // generate the increments for next iteration
+ // if (increments != null) {
+ // for (int i = 0, max = increments.length; i < max; i++) {
+ // increments[i].generateCode(scope, codeStream);
+ // }
+ // }
+ // }
+ //
+ // // May loose some local variable initializations : affecting the local
+ // variable attributes
+ // if (preCondInitStateIndex != -1) {
+ // codeStream.removeNotDefinitelyAssignedVariables(
+ // currentScope,
+ // preCondInitStateIndex);
+ // }
+ //
+ // // generate the condition
+ // conditionLabel.place();
+ // if ((condition != null) && (condition.constant == NotAConstant)) {
+ // condition.generateOptimizedBoolean(scope, codeStream, actionLabel, null,
+ // true);
+ // } else {
+ // if (continueLabel != null) {
+ // codeStream.goto_(actionLabel);
+ // }
+ // }
+ // breakLabel.place();
+ //
+ // // May loose some local variable initializations : affecting the local
+ // variable attributes
+ // if (neededScope) {
+ // codeStream.exitUserScope(scope);
+ // }
+ // if (mergedInitStateIndex != -1) {
+ // codeStream.removeNotDefinitelyAssignedVariables(
+ // currentScope,
+ // mergedInitStateIndex);
+ // }
+ // codeStream.recordPositionsFrom(pc, this.sourceStart);
+ // }
+ public void resetStateForCodeGeneration() {
+ if (this.breakLabel != null) {
+ this.breakLabel.resetStateForCodeGeneration();
}
- // continuation point
- if (continueLabel != null) {
- continueLabel.place();
- // generate the increments for next iteration
- if (increments != null) {
- for (int i = 0, max = increments.length; i < max; i++) {
- increments[i].generateCode(scope, codeStream);
- }
- }
+ if (this.continueLabel != null) {
+ this.continueLabel.resetStateForCodeGeneration();
}
+ }
- // May loose some local variable initializations : affecting the local variable attributes
- if (preCondInitStateIndex != -1) {
- codeStream.removeNotDefinitelyAssignedVariables(
- currentScope,
- preCondInitStateIndex);
- }
+ public StringBuffer printStatement(int tab, StringBuffer output) {
- // generate the condition
- conditionLabel.place();
- if ((condition != null) && (condition.constant == NotAConstant)) {
- condition.generateOptimizedBoolean(scope, codeStream, actionLabel, null, true);
- } else {
- if (continueLabel != null) {
- codeStream.goto_(actionLabel);
+ printIndent(tab, output).append("for ("); //$NON-NLS-1$
+ // inits
+ if (initializations != null) {
+ for (int i = 0; i < initializations.length; i++) {
+ // nice only with expressions
+ if (i > 0)
+ output.append(", "); //$NON-NLS-1$
+ initializations[i].print(0, output);
}
}
- breakLabel.place();
-
- // May loose some local variable initializations : affecting the local variable attributes
- if (neededScope) {
- codeStream.exitUserScope(scope);
+ output.append("; "); //$NON-NLS-1$
+ // cond
+ if (condition != null)
+ condition.printExpression(0, output);
+ output.append("; "); //$NON-NLS-1$
+ // updates
+ if (increments != null) {
+ for (int i = 0; i < increments.length; i++) {
+ if (i > 0)
+ output.append(", "); //$NON-NLS-1$
+ increments[i].print(0, output);
+ }
}
- if (mergedInitStateIndex != -1) {
- codeStream.removeNotDefinitelyAssignedVariables(
- currentScope,
- mergedInitStateIndex);
+ output.append(") "); //$NON-NLS-1$
+ // block
+ if (action == null)
+ output.append(';');
+ else {
+ output.append('\n');
+ action.printStatement(tab + 1, output); //$NON-NLS-1$
}
- codeStream.recordPositionsFrom(pc, this.sourceStart);
- }
-
- public void resetStateForCodeGeneration() {
-
- this.breakLabel.resetStateForCodeGeneration();
- this.continueLabel.resetStateForCodeGeneration();
+ return output.append(';');
}
public void resolve(BlockScope upperScope) {
for (int i = 0, length = initializations.length; i < length; i++)
initializations[i].resolve(scope);
if (condition != null) {
- TypeBinding type = condition.resolveTypeExpecting(scope, BooleanBinding);
+ TypeBinding type = condition.resolveTypeExpecting(scope,
+ BooleanBinding);
condition.implicitWidening(type, type);
}
if (increments != null)
String s = tabString(tab) + "for ("; //$NON-NLS-1$
if (!neededScope)
- s = s + " //--NO upperscope scope needed\n" + tabString(tab) + " "; //$NON-NLS-2$ //$NON-NLS-1$
- //inits
+ s = s
+ + " //--NO upperscope scope needed\n" + tabString(tab) + " "; //$NON-NLS-2$ //$NON-NLS-1$
+ // inits
if (initializations != null) {
for (int i = 0; i < initializations.length; i++) {
- //nice only with expressions
+ // nice only with expressions
s = s + initializations[i].toString(0);
if (i != (initializations.length - 1))
s = s + " , "; //$NON-NLS-1$
}
- };
+ }
+ ;
s = s + "; "; //$NON-NLS-1$
- //cond
+ // cond
if (condition != null)
s = s + condition.toStringExpression();
s = s + "; "; //$NON-NLS-1$
- //updates
+ // updates
if (increments != null) {
for (int i = 0; i < increments.length; i++) {
- //nice only with expressions
+ // nice only with expressions
s = s + increments[i].toString(0);
if (i != (increments.length - 1))
s = s + " , "; //$NON-NLS-1$
}
- };
+ }
+ ;
s = s + ") "; //$NON-NLS-1$
- //block
+ // block
if (action == null)
s = s + "{}"; //$NON-NLS-1$
else
s = s + "\n" + action.toString(tab + 1); //$NON-NLS-1$
return s;
}
-
- public void traverse(
- IAbstractSyntaxTreeVisitor visitor,
- BlockScope blockScope) {
+
+ public void traverse(ASTVisitor visitor, BlockScope blockScope) {
if (visitor.visit(this, blockScope)) {
if (initializations != null) {
}
visitor.endVisit(this, blockScope);
}
-}
\ No newline at end of file
+}
git://git.phpeclipse.com / phpeclipse.git / blobdiff