ASC 2.0 - switch statement causes crash with java.lang.NegativeArraySizeException

Question

Compiling the following program using ASC 2.0 (it should be a minimal testcase):
$ ./mxmlc Main.as
package {
    import flash.display.Sprite ;
    public class Main extends Sprite {
        public function Main() {
            var i:int = 0;
            switch {
                case -0x3A073416:
                    return;
                case 0x75B22630:
                    return;
                default:
                    return;
            return;
gives the following crash:
Internal error: java.lang.NegativeArraySizeException
        at com.adobe.flash.compiler.internal.as.codegen.ABCGeneratingReducer.reduce_lookup_switchStm t(ABCGeneratingReducer.java:5773)
        at com.adobe.flash.compiler.internal.as.codegen.ABCGeneratingReducer.reduce_switchStmt(ABCGe neratingReducer.java:5659)
        at com.adobe.flash.compiler.internal.as.codegen.CmcEmitter.action_455(CmcEmitter.java:6411)
        at com.adobe.flash.compiler.internal.as.codegen.CmcEmitter.dispatchAction(CmcEmitter.java:92 14)
        at com.adobe.flash.compiler.internal.as.codegen.CmcEmitter.reduceAntecedent(CmcEmitter.java: 39436)
        at com.adobe.flash.compiler.internal.as.codegen.CmcEmitter.reduce(CmcEmitter.java:39413)
        at com.adobe.flash.compiler.internal.as.codegen.CmcEmitter.reduceSubgoals(CmcEmitter.java:39 464)
        at com.adobe.flash.compiler.internal.as.codegen.CmcEmitter.reduceAntecedent(CmcEmitter.java: 39435)
        at com.adobe.flash.compiler.internal.as.codegen.CmcEmitter.reduce(CmcEmitter.java:39413)
        at com.adobe.flash.compiler.internal.as.codegen.CmcEmitter.reduceSubgoals(CmcEmitter.java:39 455)
        at com.adobe.flash.compiler.internal.as.codegen.CmcEmitter.reduceAntecedent(CmcEmitter.java: 39435)
        at com.adobe.flash.compiler.internal.as.codegen.CmcEmitter.reduce(CmcEmitter.java:39413)
        at com.adobe.flash.compiler.internal.as.codegen.CmcEmitter.burm(CmcEmitter.java:39715)
        at com.adobe.flash.compiler.internal.as.codegen.ABCGenerator.generateInstructions(ABCGenerat or.java:232)
        at com.adobe.flash.compiler.internal.as.codegen.ABCGenerator.generateMethodBodyForFunction(A BCGenerator.java:397)
        at com.adobe.flash.compiler.internal.as.codegen.ABCGenerator.generateMethodBodyForFunction(A BCGenerator.java:351)
        at com.adobe.flash.compiler.internal.as.codegen.ABCGenerator.generateFunction(ABCGenerator.j ava:266)
        at com.adobe.flash.compiler.internal.as.codegen.ClassDirectiveProcessor.finishClassDefinitio n(ClassDirectiveProcessor.java:487)
        at com.adobe.flash.compiler.internal.as.codegen.GlobalDirectiveProcessor.declareClass(Global DirectiveProcessor.java:424)
        at com.adobe.flash.compiler.internal.as.codegen.DirectiveProcessor.processNode(DirectiveProc essor.java:207)
        at com.adobe.flash.compiler.internal.as.codegen.DirectiveProcessor.traverse(DirectiveProcess or.java:189)
        at com.adobe.flash.compiler.internal.as.codegen.GlobalDirectiveProcessor.declarePackage(Glob alDirectiveProcessor.java:449)
        at com.adobe.flash.compiler.internal.as.codegen.DirectiveProcessor.processNode(DirectiveProc essor.java:224)
        at com.adobe.flash.compiler.internal.as.codegen.DirectiveProcessor.traverse(DirectiveProcess or.java:189)
        at com.adobe.flash.compiler.internal.as.codegen.ABCGenerator.generate(ABCGenerator.java:126)
        at com.adobe.flash.compiler.internal.units.ASCompilationUnit.handleABCBytesRequest(ASCompila tionUnit.java:374)
        at com.adobe.flash.compiler.internal.units.CompilationUnitBase.processABCBytesRequest(Compil ationUnitBase.java:866)
        at com.adobe.flash.compiler.internal.units.CompilationUnitBase.access$300(CompilationUnitBas e.java:107)
        at com.adobe.flash.compiler.internal.units.CompilationUnitBase$4$1.call(CompilationUnitBase. java:309)
        at com.adobe.flash.compiler.internal.units.CompilationUnitBase$4$1.call(CompilationUnitBase. java:305)
        at com.adobe.flash.compiler.internal.units.requests.RequestMaker$1.call(RequestMaker.java:22 8)
        at com.adobe.flash.compiler.internal.units.requests.RequestMaker$1.call(RequestMaker.java:22 2)
        at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
                public function Main() {
                ^

Answer 1

Hi,
The range between the min and case case values was causing an overflow, as it was larger than 2^3 -1.  I have just fixed this bug.
Until the next compiler drop, you can work around the problem by making one of the case values non-const (example below), which will cause the compiler to not try and create a lookup switch table and avoid the buggy code path.
var i:int = 0;
var caseValue:int = -0x3A073416;
switch
          case caseValue:
        return;
    case 0x75B22630:
        return;
    default:
        return;