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  4. Minimal Value Types and Valhalla value types command line options

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Old Version 2

changes.mady.by.user Paul Sandoz

Saved on Jun 23, 2017

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New Version 3

changes.mady.by.user Maurizio Cimadamore

Saved on Jun 23, 2017

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  • -XDenableValueTypes
    Boolean value, default value is `false`
    Enable direct declaration and compilation of value type classes via the "__ByValue" and other qualifiers.
  • -XDmangleClassInfo
    Boolean value, default value is `false`
    Ensure value type names are distinguishable a reference class names by prepending ";Q" to the value type name.
    Should be used in conjunction with java flag "valhalla.mangleClassInfo".
  • -Xlint:values
    Lint category for warnings associated to bad usage of value capable classes - examples:
    • VCC not final
    • VCC cannot 'extend' another class
    • overrides of 'bad' Object methods (such as wait/notify)
    • illegal modifiers on VCC such as 'synchronized'
    • non-final instance fields in VCC
    • cannot assign 'null' to variable of VCC type

java

  • -Djava.lang.invoke.MethodHandle.DUMP_CLASS_FILES
    Boolean value, default value is `false`
    If true dump class files generated for lambda forms and derived value types into a directory named DUMP_CLASS_FILES under the current directory
  • -Dvalhalla.enableValueLambdaForms
    Boolean value, default value is `true`
    If true then lambda forms with value types in their signature will use the Q type __Value and value-type specific byte code will be generated.
  • -Dvalhalla.enablePoolPatches
    Boolean value, default value is `false`
    If true and if "valhalla.enableValueLambdaForms" is true then lambda forms with value types in their signature will generate byte code with constant pool patching where appropriate
  • -Dvalhalla.mangleClassInfo
    Boolean value, default value is `false`
    Ensure value type names are distinguishable a reference class names by prepending ";Q" to the value type name.
    Should be used in conjunction with javac flag "mangleClassInfo".

...

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