/*******************************************************************************
- * 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.CaseLabel;
-import net.sourceforge.phpdt.internal.compiler.codegen.CodeStream;
+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.lookup.TypeBinding;
public class SwitchStatement extends Statement {
- public Expression testExpression;
+ public Expression expression;
+
public Statement[] statements;
+
public BlockScope scope;
+
public int explicitDeclarations;
+
public Label breakLabel;
- public Case[] cases;
+
+ 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 = testExpression.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
+ 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.DeadEnd;
+ FlowInfo caseInits = FlowInfo.DEAD_END;
// in case of statements before the first case
- preSwitchInitStateIndex =
- currentScope.methodScope().recordInitializationStates(flowInfo);
+ 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])) { // statements[i] is a case or a default case
+ if ((caseIndex < caseCount) && (statement == cases[caseIndex])) { // statement
+ // is a
+ // case
caseIndex++;
- caseInits = caseInits.mergedWith(flowInfo.copy().unconditionalInits());
- } else {
- if (statement == defaultCase) {
- caseInits = caseInits.mergedWith(flowInfo.copy().unconditionalInits());
- }
+ 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)) {
- caseInits = statement.analyseCode(scope, switchContext, caseInits);
+ 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 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);
+ 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);
+ mergedInitStateIndex = currentScope.methodScope()
+ .recordInitializationStates(mergedInfo);
return mergedInfo;
}
+
/**
* Switch 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) {
- int[] sortedIndexes = new int[caseCount];
- int[] localKeysCopy;
- if ((bits & IsReachableMASK) == 0) {
- return;
- }
- int pc = codeStream.position;
+ // 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);
+ // }
- // 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));
+ public void resetStateForCodeGeneration() {
+ if (this.breakLabel != null) {
+ this.breakLabel.resetStateForCodeGeneration();
}
+ }
- // 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);
+ public StringBuffer printStatement(int indent, StringBuffer output) {
- // generate the appropriate switch table
- if (needSwitch) {
- int max = localKeysCopy[caseCount - 1];
- int min = localKeysCopy[0];
- if ((long) (caseCount * 2.5) > ((long) max - (long) min)) {
- 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;
+ printIndent(indent, output).append("switch ("); //$NON-NLS-1$
+ expression.printExpression(0, output).append(") {"); //$NON-NLS-1$
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++;
- }
+ for (int i = 0; i < statements.length; i++) {
+ output.append('\n');
+ if (statements[i] instanceof CaseStatement) {
+ statements[i].printStatement(indent, output);
} else {
- if (statement == defaultCase) { // statements[i] is a case or a default case
- if (preSwitchInitStateIndex != -1) {
- codeStream.removeNotDefinitelyAssignedVariables(
- currentScope,
- preSwitchInitStateIndex);
- }
- }
+ statements[i].printStatement(indent + 2, output);
}
- 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() {
-
- this.breakLabel.resetStateForCodeGeneration();
+ output.append("\n"); //$NON-NLS-1$
+ return printIndent(indent, output).append('}');
}
public void resolve(BlockScope upperScope) {
- TypeBinding testType = testExpression.resolveType(upperScope);
+ TypeBinding testType = expression.resolveType(upperScope);
if (testType == null)
return;
- testExpression.implicitWidening(testType, testType);
- if (!(testExpression
- .isConstantValueOfTypeAssignableToType(testType, IntBinding))) {
- if (!BlockScope.areTypesCompatible(testType, IntBinding)) {
- upperScope.problemReporter().incorrectSwitchType(testExpression, testType);
+ 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);
+ scope = explicitDeclarations == 0 ? upperScope : new BlockScope(
+ upperScope);
int length;
- // collection of cases is too big but we will only iterate until caseCount
- cases = new Case[length = statements.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------------
+ // ----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((Case) statements[i], cst);
+ 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 (" + testExpression.toStringExpression() + ") "; //$NON-NLS-1$ //$NON-NLS-2$
+ 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"); //$NON-NLS-1$
+ 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.
+ // 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 Break)
+ 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 Case)
- || (statements[i] instanceof DefaultCase)) {
+ // =============
+ if ((statements[i] instanceof CaseStatement)
+ || (statements[i] instanceof DefaultCase)) {
i++;
- while (!((statements[i] instanceof Case)
- || (statements[i] instanceof DefaultCase))) {
- if ((statements[i] instanceof Expression) || (statements[i] instanceof Break))
+ 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) + " ; "; //$NON-NLS-1$ //$NON-NLS-2$
+ s = s
+ + "\n" + statements[i].toString(tab + 6) + " ; "; //$NON-NLS-1$ //$NON-NLS-2$
i++;
}
} else {
}
}
} catch (IndexOutOfBoundsException e) {
- };
+ }
+ ;
s = s + "}"; //$NON-NLS-1$
return s;
}
- public void traverse(
- IAbstractSyntaxTreeVisitor visitor,
- BlockScope blockScope) {
+ public void traverse(ASTVisitor visitor, BlockScope blockScope) {
if (visitor.visit(this, blockScope)) {
- testExpression.traverse(visitor, scope);
+ expression.traverse(visitor, scope);
if (statements != null) {
int statementsLength = statements.length;
for (int i = 0; i < statementsLength; i++)
}
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
label.appendForwardReferencesFrom(this.breakLabel);
}
}
-}
\ No newline at end of file
+}
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