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  1. JDK
  2. JDK-8221118

Avoid eagerly creating JCDiagnostic for CompletionFailures

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    • b15

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      When javac resolves a file with many yet-to-be generated types, a CompletionFailure is created while trying to resolve each one. In order to create those objects, a new JCDiagnostic is also created. In profiles of large compilations with annotation processing, I've seen the JCDiagnostic creation continually show up as taking anywhere from 700ms - 3s depending on the compilation/structure of the generated code. In the case of annotation processing, these diagnostics may never be reported to the messager if a later round generates the types.

      I propose that instead of taking a JCDiagnostic, we change CompletionFailure to take a Supplier<JCDiagnostic>, similar to the approach taken in JDK-8215368.

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            ronsh Ron Shapiro
            ronsh Ron Shapiro
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