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;
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;
checkUnreachable = true;
}
- public FlowInfo analyseCode(
- BlockScope currentScope,
- FlowContext flowContext,
- FlowInfo flowInfo) {
+ 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;
-
+ boolean isConditionOptimizedTrue = cst != NotAConstant
+ && cst.booleanValue() == true;
+ boolean isConditionOptimizedFalse = cst != NotAConstant
+ && cst.booleanValue() == false;
+
// process the THEN part
FlowInfo thenFlowInfo = flowInfo.initsWhenTrue().copy();
if (isConditionOptimizedFalse) {
- thenFlowInfo.setReachMode(FlowInfo.UNREACHABLE);
+ thenFlowInfo.setReachMode(FlowInfo.UNREACHABLE);
}
if (this.thenStatement != null) {
// Save info for code gen
- thenInitStateIndex =
- currentScope.methodScope().recordInitializationStates(thenFlowInfo);
- if (!thenFlowInfo.complainIfUnreachable(thenStatement, currentScope, false)) {
- 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
this.thenExit = !thenFlowInfo.isReachable();
// process the ELSE part
FlowInfo elseFlowInfo = flowInfo.initsWhenFalse().copy();
if (isConditionOptimizedTrue) {
- elseFlowInfo.setReachMode(FlowInfo.UNREACHABLE);
+ elseFlowInfo.setReachMode(FlowInfo.UNREACHABLE);
}
if (this.elseStatement != null) {
// Save info for code gen
- elseInitStateIndex =
- currentScope.methodScope().recordInitializationStates(elseFlowInfo);
- if (!elseFlowInfo.complainIfUnreachable(elseStatement, currentScope, false)) {
- 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 (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 (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);
+ mergedInfo = thenFlowInfo
+ .addPotentialInitializationsFrom(elseFlowInfo);
} else {
mergedInfo = elseFlowInfo.setReachMode(FlowInfo.UNREACHABLE);
}
} else if (isConditionOptimizedFalse) {
if (!elseExit) {
- mergedInfo = elseFlowInfo.addPotentialInitializationsFrom(thenFlowInfo);
+ 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 net.sourceforge.phpdt.internal.compiler.lookup.BlockScope
- * @param codeStream net.sourceforge.phpdt.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 ((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 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) {
printIndent(indent, output).append("if ("); //$NON-NLS-1$
- condition.printExpression(0, output).append(")\n"); //$NON-NLS-1$
+ condition.printExpression(0, output).append(")\n"); //$NON-NLS-1$
thenStatement.printStatement(indent + 2, output);
if (elseStatement != null) {
output.append('\n');
}
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(
- ASTVisitor visitor,
- BlockScope blockScope) {
+ public void traverse(ASTVisitor visitor, BlockScope blockScope) {
if (visitor.visit(this, blockScope)) {
condition.traverse(visitor, blockScope);
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