+/*******************************************************************************
+ * 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.phpdt.internal.compiler.ast;
-import java.util.List;
-
-/**
- * @author Matthieu Casanova
- */
-public final class SwitchStatement extends Statement {
-
- private final Expression variable;
- private final AbstractCase[] cases;
-
- public SwitchStatement(final Expression variable,
- final AbstractCase[] cases,
- final int sourceStart,
- final int sourceEnd) {
- super(sourceStart, sourceEnd);
- this.variable = variable;
- this.cases = cases;
- }
-
- /**
- * Return the object into String.
- * @param tab how many tabs (not used here
- * @return a String
- */
- public String toString(final int tab) {
- final StringBuffer buff = new StringBuffer(tabString(tab));
- buff.append("switch (").append(variable.toStringExpression()).append(") {\n");
- for (int i = 0; i < cases.length; i++) {
- final AbstractCase cas = cases[i];
- buff.append(cas.toString(tab + 1));
- buff.append('\n');
- }
- buff.append('}');
- return buff.toString();
- }
-
- /**
- * Get the variables from outside (parameters, globals ...)
- *
- * @param list the list where we will put variables
- */
- public void getOutsideVariable(final List list) {
- for (int i = 0; i < cases.length; i++) {
- cases[i].getOutsideVariable(list);
- }
- }
-
- /**
- * get the modified variables.
- *
- * @param list the list where we will put variables
- */
- public void getModifiedVariable(final List list) {
- for (int i = 0; i < cases.length; i++) {
- cases[i].getModifiedVariable(list);
- }
- variable.getModifiedVariable(list);
- }
-
- /**
- * Get the variables used.
- *
- * @param list the list where we will put variables
- */
- public void getUsedVariable(final List list) {
- for (int i = 0; i < cases.length; i++) {
- cases[i].getUsedVariable(list);
- }
- variable.getUsedVariable(list);
- }
+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.SwitchFlowContext;
+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 SwitchStatement extends Statement {
+ public Expression expression;
+
+ public Statement[] statements;
+
+ public BlockScope scope;
+
+ public int explicitDeclarations;
+
+ public Label breakLabel;
+
+ public CaseStatement[] cases;
+
+ public DefaultCase defaultCase;
+
+ public int caseCount = 0;
+
+ // for local variables table attributes
+ int preSwitchInitStateIndex = -1;
+
+ int mergedInitStateIndex = -1;
+
+ /**
+ * SwitchStatement constructor comment.
+ */
+ public SwitchStatement() {
+ super();
+ }
+
+ public FlowInfo analyseCode(BlockScope currentScope,
+ FlowContext flowContext, FlowInfo flowInfo) {
+ flowInfo = expression.analyseCode(currentScope, flowContext, flowInfo);
+ SwitchFlowContext switchContext = new SwitchFlowContext(flowContext,
+ this, (breakLabel = new Label()));
+
+ // analyse the block by considering specially the case/default
+ // statements (need to bind them
+ // to the entry point)
+ FlowInfo caseInits = FlowInfo.DEAD_END;
+ // in case of statements before the first case
+ preSwitchInitStateIndex = currentScope.methodScope()
+ .recordInitializationStates(flowInfo);
+ int caseIndex = 0;
+ if (statements != null) {
+ boolean didAlreadyComplain = false;
+ for (int i = 0, max = statements.length; i < max; i++) {
+ Statement statement = statements[i];
+ if ((caseIndex < caseCount) && (statement == cases[caseIndex])) { // statement
+ // is a
+ // case
+ caseIndex++;
+ caseInits = caseInits.mergedWith(flowInfo.copy()
+ .unconditionalInits());
+ didAlreadyComplain = false; // reset complaint
+ } else if (statement == defaultCase) { // statement is the
+ // default case
+ caseInits = caseInits.mergedWith(flowInfo.copy()
+ .unconditionalInits());
+ didAlreadyComplain = false; // reset complaint
+ }
+ if (!caseInits.complainIfUnreachable(statement, scope,
+ didAlreadyComplain)) {
+ caseInits = statement.analyseCode(scope, switchContext,
+ caseInits);
+ } else {
+ didAlreadyComplain = true;
+ }
+ }
+ }
+
+ // if no default case, then record it may jump over the block directly
+ // to the end
+ if (defaultCase == null) {
+ // only retain the potential initializations
+ flowInfo.addPotentialInitializationsFrom(caseInits
+ .mergedWith(switchContext.initsOnBreak));
+ mergedInitStateIndex = currentScope.methodScope()
+ .recordInitializationStates(flowInfo);
+ return flowInfo;
+ }
+
+ // merge all branches inits
+ FlowInfo mergedInfo = caseInits.mergedWith(switchContext.initsOnBreak);
+ mergedInitStateIndex = currentScope.methodScope()
+ .recordInitializationStates(mergedInfo);
+ return mergedInfo;
+ }
+
+ /**
+ * Switch code generation
+ *
+ * @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)
+ // {
+ // int[] sortedIndexes = new int[caseCount];
+ // int[] localKeysCopy;
+ // if ((bits & IsReachableMASK) == 0) {
+ // return;
+ // }
+ // int pc = codeStream.position;
+ //
+ // // prepare the labels and constants
+ // breakLabel.codeStream = codeStream;
+ // CaseLabel[] caseLabels = new CaseLabel[caseCount];
+ // int[] constants = new int[caseCount];
+ // boolean needSwitch = caseCount != 0;
+ // for (int i = 0; i < caseCount; i++) {
+ // constants[i] = cases[i].constantExpression.constant.intValue();
+ // cases[i].targetLabel = (caseLabels[i] = new CaseLabel(codeStream));
+ // }
+ //
+ // // we sort the keys to be able to generate the code for tableswitch or
+ // lookupswitch
+ // for (int i = 0; i < caseCount; i++) {
+ // sortedIndexes[i] = i;
+ // }
+ // System.arraycopy(
+ // constants,
+ // 0,
+ // (localKeysCopy = new int[caseCount]),
+ // 0,
+ // caseCount);
+ // CodeStream.sort(localKeysCopy, 0, caseCount - 1, sortedIndexes);
+ // CaseLabel defaultLabel = new CaseLabel(codeStream);
+ // if (defaultCase != null) {
+ // defaultCase.targetLabel = defaultLabel;
+ // }
+ // // generate expression testes
+ // testExpression.generateCode(currentScope, codeStream, needSwitch);
+ //
+ // // generate the appropriate switch table/lookup bytecode
+ // if (needSwitch) {
+ // int max = localKeysCopy[caseCount - 1];
+ // int min = localKeysCopy[0];
+ // if ((long) (caseCount * 2.5) > ((long) max - (long) min)) {
+ //
+ // // work-around 1.3 VM bug, if max>0x7FFF0000, must use lookup bytecode
+ // // see http://dev.eclipse.org/bugs/show_bug.cgi?id=21557
+ // if (max > 0x7FFF0000 &&
+ // currentScope.environment().options.complianceLevel <
+ // CompilerOptions.JDK1_4) {
+ // codeStream.lookupswitch(defaultLabel, constants, sortedIndexes,
+ // caseLabels);
+ //
+ // } else {
+ // codeStream.tableswitch(
+ // defaultLabel,
+ // min,
+ // max,
+ // constants,
+ // sortedIndexes,
+ // caseLabels);
+ // }
+ // } else {
+ // codeStream.lookupswitch(defaultLabel, constants, sortedIndexes,
+ // caseLabels);
+ // }
+ // codeStream.updateLastRecordedEndPC(codeStream.position);
+ // }
+ //
+ // // generate the switch block statements
+ // int caseIndex = 0;
+ // if (statements != null) {
+ // for (int i = 0, maxCases = statements.length; i < maxCases; i++) {
+ // Statement statement = statements[i];
+ // if ((caseIndex < caseCount)
+ // && (statement == cases[caseIndex])) { // statements[i] is a case
+ // if (preSwitchInitStateIndex != -1) {
+ // codeStream.removeNotDefinitelyAssignedVariables(
+ // currentScope,
+ // preSwitchInitStateIndex);
+ // caseIndex++;
+ // }
+ // } else {
+ // if (statement == defaultCase) { // statements[i] is a case or a default
+ // case
+ // if (preSwitchInitStateIndex != -1) {
+ // codeStream.removeNotDefinitelyAssignedVariables(
+ // currentScope,
+ // preSwitchInitStateIndex);
+ // }
+ // }
+ // }
+ // statement.generateCode(scope, codeStream);
+ // }
+ // }
+ // // place the trailing labels (for break and default case)
+ // breakLabel.place();
+ // if (defaultCase == null) {
+ // defaultLabel.place();
+ // }
+ // // May loose some local variable initializations : affecting the local
+ // variable attributes
+ // if (mergedInitStateIndex != -1) {
+ // codeStream.removeNotDefinitelyAssignedVariables(
+ // currentScope,
+ // mergedInitStateIndex);
+ // codeStream.addDefinitelyAssignedVariables(currentScope,
+ // mergedInitStateIndex);
+ // }
+ // if (scope != currentScope) {
+ // codeStream.exitUserScope(scope);
+ // }
+ // codeStream.recordPositionsFrom(pc, this.sourceStart);
+ // }
+
+ public void resetStateForCodeGeneration() {
+ if (this.breakLabel != null) {
+ this.breakLabel.resetStateForCodeGeneration();
+ }
+ }
+
+ public StringBuffer printStatement(int indent, StringBuffer output) {
+
+ printIndent(indent, output).append("switch ("); //$NON-NLS-1$
+ expression.printExpression(0, output).append(") {"); //$NON-NLS-1$
+ if (statements != null) {
+ for (int i = 0; i < statements.length; i++) {
+ output.append('\n');
+ if (statements[i] instanceof CaseStatement) {
+ statements[i].printStatement(indent, output);
+ } else {
+ statements[i].printStatement(indent + 2, output);
+ }
+ }
+ }
+ output.append("\n"); //$NON-NLS-1$
+ return printIndent(indent, output).append('}');
+ }
+
+ public void resolve(BlockScope upperScope) {
+
+ TypeBinding testType = expression.resolveType(upperScope);
+ if (testType == null)
+ return;
+ expression.implicitWidening(testType, testType);
+ if (!(expression.isConstantValueOfTypeAssignableToType(testType,
+ IntBinding))) {
+ if (!testType.isCompatibleWith(IntBinding)) {
+ upperScope.problemReporter().incorrectSwitchType(expression,
+ testType);
+ return;
+ }
+ }
+ if (statements != null) {
+ scope = explicitDeclarations == 0 ? upperScope : new BlockScope(
+ upperScope);
+ int length;
+ // collection of cases is too big but we will only iterate until
+ // caseCount
+ cases = new CaseStatement[length = statements.length];
+ int[] casesValues = new int[length];
+ int counter = 0;
+ for (int i = 0; i < length; i++) {
+ Constant cst;
+ if ((cst = statements[i].resolveCase(scope, testType, this)) != null) {
+ // ----check for duplicate case statement------------
+ if (cst != NotAConstant) {
+ int key = cst.intValue();
+ for (int j = 0; j < counter; j++) {
+ if (casesValues[j] == key) {
+ scope.problemReporter().duplicateCase(
+ (CaseStatement) statements[i], cst); // TODO:
+ // (philippe)
+ // could
+ // improve
+ // diagnosis
+ // to
+ // indicate
+ // colliding
+ // case
+ }
+ }
+ casesValues[counter++] = key;
+ }
+ }
+ }
+ }
+ }
+
+ public String toString(int tab) {
+
+ String inFront, s = tabString(tab);
+ inFront = s;
+ s = s + "switch (" + expression.toStringExpression() + ") "; //$NON-NLS-1$ //$NON-NLS-2$
+ if (statements == null) {
+ s = s + "{}"; //$NON-NLS-1$
+ return s;
+ } else
+ s = s + "{"; //$NON-NLS-1$
+ s = s
+ + (explicitDeclarations != 0 ? "// ---scope needed for " //$NON-NLS-1$
+ + String.valueOf(explicitDeclarations)
+ + " locals------------ \n"//$NON-NLS-1$
+ : "// ---NO scope needed------ \n"); //$NON-NLS-1$
+
+ int i = 0;
+ String tabulation = " "; //$NON-NLS-1$
+ try {
+ while (true) {
+ // use instanceof in order not to polluate classes with behavior
+ // only needed for printing purpose.
+ if (statements[i] instanceof Expression)
+ s = s + "\n" + inFront + tabulation; //$NON-NLS-1$
+ if (statements[i] instanceof BreakStatement)
+ s = s + statements[i].toString(0);
+ else
+ s = s + "\n" + statements[i].toString(tab + 2); //$NON-NLS-1$
+ // =============
+ if ((statements[i] instanceof CaseStatement)
+ || (statements[i] instanceof DefaultCase)) {
+ i++;
+ while (!((statements[i] instanceof CaseStatement) || (statements[i] instanceof DefaultCase))) {
+ if ((statements[i] instanceof Expression)
+ || (statements[i] instanceof BreakStatement))
+ s = s + statements[i].toString(0) + " ; "; //$NON-NLS-1$
+ else
+ s = s
+ + "\n" + statements[i].toString(tab + 6) + " ; "; //$NON-NLS-1$ //$NON-NLS-2$
+ i++;
+ }
+ } else {
+ s = s + " ;"; //$NON-NLS-1$
+ i++;
+ }
+ }
+ } catch (IndexOutOfBoundsException e) {
+ }
+ ;
+ s = s + "}"; //$NON-NLS-1$
+ return s;
+ }
+
+ public void traverse(ASTVisitor visitor, BlockScope blockScope) {
+
+ if (visitor.visit(this, blockScope)) {
+ expression.traverse(visitor, scope);
+ if (statements != null) {
+ int statementsLength = statements.length;
+ for (int i = 0; i < statementsLength; i++)
+ statements[i].traverse(visitor, scope);
+ }
+ }
+ visitor.endVisit(this, blockScope);
+ }
+
+ /**
+ * Dispatch the call on its last statement.
+ */
+ public void branchChainTo(Label label) {
+
+ // in order to improve debug attributes for stepping (11431)
+ // we want to inline the jumps to #breakLabel which already got
+ // generated (if any), and have them directly branch to a better
+ // location (the argument label).
+ // we know at this point that the breakLabel already got placed
+ if (this.breakLabel.hasForwardReferences()) {
+ label.appendForwardReferencesFrom(this.breakLabel);
+ }
+ }
}
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