RFR: 8257740: Compiler crash when compiling type annotation on multicatch inside lambda

Guoxiong Li github.com+13688759+lgxbslgx at openjdk.java.net
Thu Dec 10 14:52:40 UTC 2020

On Thu, 10 Dec 2020 13:58:22 GMT, Joel Borggrén-Franck <jfranck at openjdk.org> wrote:

>> Hi all,
>> When translating a lambda expression to method, the method `LambdaToMethod.LambdaAnalyzerPreprocessor.LambdaTranslationContext.translate(final Symbol sym, LambdaSymbolKind skind)` creates new VarSymbol(s) according to the old VarSymbol(s). But this `translate` method doesn't set the field `data`  of the new VarSymbol. Maybe it is because the field `data` is unused in later phase.
>> Unfortunately, `com.sun.tools.javac.jvm.Code.fillExceptionParameterPositions` and `com.sun.tools.javac.jvm.Code.fillLocalVarPosition` would use the field `data` if the `data` is `ElementKind.EXCEPTION_PARAMETER`.
>> It causes the exception_index won't be set in `fillExceptionParameterPositions`. Later, if the exception_index is used, the compiler will crash with error `java.lang.AssertionError: exception_index is not set`.
>> This patch fixes it and adds corresponding test cases.
>> In my patch, I only set the field ` data`  if  the `data` is `ElementKind.EXCEPTION_PARAMETER`. Because I don't see another situation that the field `data` would be used.
>> Thank your for taking the time to review.
>> Best Regards.
> test/langtools/tools/javac/T8257740/T8257740_2.java line 42:
>> 40:             try {
>> 41:                 System.out.println();
>> 42:             } catch (@T8257740_2_Anno Exception e) { // multi-catch
> This looks like a uni-catch?

Sorry for the mistake. I will fix it later.


PR: https://git.openjdk.java.net/jdk/pull/1648

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