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Code Block
//           macro body starts here -------------------+
//                                                     |
//                                                     v
#define FLAG_LIMIT_DEFINE(      type, name, ...)       ); constconstexpr JVMTypedFlagLimit<type> limit_##name(0
#define FLAG_LIMIT_DEFINE_DUMMY(type, name, ...)       ); constconstexpr DummyLimit nolimit_##name(0
#define FLAG_LIMIT_PTR(         type, name, ...)       ), LimitGetter<type>::get_limit(&limit_##name, 0
#define FLAG_LIMIT_PTR_NONE(    type, name, ...)       ), LimitGetter<type>::no_limit(0
#define APPLY_FLAG_RANGE(...)                          , __VA_ARGS__
#define APPLY_FLAG_CONSTRAINT(func, phase)             , next_two_args_are_constraint, (short)CONSTRAINT_ENUM(func), int(JVMFlagConstraint::phase)

constexpr JVMTypedFlagLimit<int> limit_dummy
(
#ifdef PRODUCT
 ALL_FLAGS(FLAG_LIMIT_DEFINE_DUMMY,
           FLAG_LIMIT_DEFINE_DUMMY,
           FLAG_LIMIT_DEFINE,
           FLAG_LIMIT_DEFINE,
           FLAG_LIMIT_DEFINE_DUMMY,
           APPLY_FLAG_RANGE,
           APPLY_FLAG_CONSTRAINT)
#else
 ALL_FLAGS(FLAG_LIMIT_DEFINE,
           FLAG_LIMIT_DEFINE,
           FLAG_LIMIT_DEFINE,
           FLAG_LIMIT_DEFINE,
           FLAG_LIMIT_DEFINE,
           APPLY_FLAG_RANGE,
           APPLY_FLAG_CONSTRAINT)
#endif
);

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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