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NullPointerException in backward analysis. #3447

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xingweitian opened this issue Jul 8, 2020 · 0 comments · Fixed by #3414
Closed

NullPointerException in backward analysis. #3447

xingweitian opened this issue Jul 8, 2020 · 0 comments · Fixed by #3414
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Get NullPointerException when executing backward analysis:

> Task :dataflow:LiveVariablePlayground.main() FAILED
Exception in thread "main" java.lang.NullPointerException
	at org.checkerframework.dataflow.analysis.BackwardAnalysisImpl.performAnalysisBlock(BackwardAnalysisImpl.java:134)
	at org.checkerframework.dataflow.analysis.BackwardAnalysisImpl.performAnalysis(BackwardAnalysisImpl.java:86)
	at org.checkerframework.dataflow.cfg.CFGVisualizeLauncher.generateDOTofCFG(CFGVisualizeLauncher.java:145)
	at org.checkerframework.dataflow.cfg.playground.LiveVariablePlayground.main(LiveVariablePlayground.java:31)

Execution failed for task ':dataflow:LiveVariablePlayground.main()'.
> Process 'command '/opt/jdk/jdk-11/bin/java'' finished with non-zero exit value 1

A minimal test case:

public class Test {
    public void test() throws Exception {
        try {
            int[] myNumbers = {1};
            System.out.println(myNumbers[1]);
        } catch (Exception e) {}
    }
}

This issue will be fixed in #3414.
@xingweitian xingweitian self-assigned this Jul 8, 2020
@xingweitian xingweitian mentioned this issue Jul 8, 2020
Merged
smillst pushed a commit that referenced this issue Jul 23, 2020
@xingweitian
Correct the logic of dataflow framework. (#3414)
bc9a120 
BackwardAnalysis:
1. Add exception block's predecessor exception block to inputs (fix null pointer exception).
2. When running `runAnalysisFor()` with an exception block, pass a copied transfer input to `callTransferFunction()`.

ForwardAnalysis:
1. When running `runAnalysisFor()` with an exception block, pass a copied transfer input to `callTransferFunction()`. In the previous dataflow framework (before #3370), we passed a non-copied transfer input (https://github.com/typetools/checker-framework/pull/3370/files#diff-d4108228a0a5407e00c090c2e97d8b6dL401-L402). This seems a bug existing in the old dataflow framework.

Resolves #3447.
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Correct the logic of dataflow framework. xingweitian/checker-framework
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