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To understand how the macros work, it's best to compile jvmFlagLimit.c with gcc -save-temps. and look at the generated jvmFlagLimit.ii with the macros expanded. Here's an example (prettified manually):

Code Block
// code excerpt prettified manually
constexpr JVMTypedFlagLimit<int>  limit_dummy();
constexpr JVMTypedFlagLimit<bool> limit_UseCompressedOops(0);
....
constexpr JVMTypedFlagLimit<intx> limit_ObjectAlignmentInBytes(0, 8, 256,
             next_two_args_are_constraint,
            (short)constraint_enum_ObjectAlignmentInBytesConstraintFunc, int(JVMFlagConstraint::AtParse));
....
constexpr JVMTypedFlagLimit<intx> limit_JVMCIThreads(0, 1, max_jint);

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