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Workaround MSVC VA_ARGS weirdness

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This commit is contained in:
Joshua Cannon 2019-10-11 09:28:25 -05:00
parent 76a560c81c
commit c081ceebfb
1 changed files with 19 additions and 66 deletions
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85
googlemock/include/gmock/internal/gmock-pp.h
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@ -1,19 +1,6 @@
#ifndef THIRD_PARTY_GOOGLETEST_GOOGLEMOCK_INCLUDE_GMOCK_PP_H_
#define THIRD_PARTY_GOOGLETEST_GOOGLEMOCK_INCLUDE_GMOCK_PP_H_
#undef GMOCK_PP_INTERNAL_USE_MSVC
#if defined(__clang__)
#define GMOCK_PP_INTERNAL_USE_MSVC 0
#elif defined(_MSC_VER)
// TODO(iserna): Also verify tradional versus comformant preprocessor.
static_assert(
_MSC_VER >= 1900,
"MSVC version not supported. There is support for MSVC 14.0 and above.");
#define GMOCK_PP_INTERNAL_USE_MSVC 1
#else
#define GMOCK_PP_INTERNAL_USE_MSVC 0
#endif
// Expands and concatenates the arguments. Constructed macros reevaluate.
#define GMOCK_PP_CAT(_1, _2) GMOCK_PP_INTERNAL_CAT(_1, _2)
@ -29,10 +16,6 @@ static_assert(
// Returns the only argument.
#define GMOCK_PP_IDENTITY(_1) _1
// MSVC preprocessor collapses __VA_ARGS__ in a single argument, we use a
// CAT-like directive to force correct evaluation. Each macro has its own.
#if GMOCK_PP_INTERNAL_USE_MSVC
// Evaluates to the number of arguments after expansion.
//
// #define PAIR x, y
@ -43,45 +26,32 @@ static_assert(
// GMOCK_PP_NARG(PAIR) => 2
//
// Requires: the number of arguments after expansion is at most 15.
#define GMOCK_PP_NARG(...) \
GMOCK_PP_INTERNAL_NARG_CAT( \
GMOCK_PP_INTERNAL_INTERNAL_16TH(__VA_ARGS__, 15, 14, 13, 12, 11, 10, 9, \
8, 7, 6, 5, 4, 3, 2, 1), )
#define GMOCK_PP_NARG(...) \
GMOCK_PP_INTERNAL_EXPAND_WITH( \
GMOCK_PP_INTERNAL_INTERNAL_16TH, \
(__VA_ARGS__, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1))
// Returns 1 if the expansion of arguments has an unprotected comma. Otherwise
// returns 0. Requires no more than 15 unprotected commas.
#define GMOCK_PP_HAS_COMMA(...) \
GMOCK_PP_INTERNAL_HAS_COMMA_CAT( \
GMOCK_PP_INTERNAL_INTERNAL_16TH(__VA_ARGS__, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
1, 1, 1, 1, 1, 0), )
#define GMOCK_PP_HAS_COMMA(...) \
GMOCK_PP_INTERNAL_EXPAND_WITH( \
GMOCK_PP_INTERNAL_INTERNAL_16TH, \
(__VA_ARGS__, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0))
// Returns the first argument.
#define GMOCK_PP_HEAD(...) \
GMOCK_PP_INTERNAL_HEAD_CAT(GMOCK_PP_INTERNAL_HEAD(__VA_ARGS__), )
GMOCK_PP_INTERNAL_EXPAND_WITH(GMOCK_PP_INTERNAL_HEAD, (__VA_ARGS__))
// Returns the tail. A variadic list of all arguments minus the first. Requires
// at least one argument.
#define GMOCK_PP_TAIL(...) \
GMOCK_PP_INTERNAL_TAIL_CAT(GMOCK_PP_INTERNAL_TAIL(__VA_ARGS__), )
GMOCK_PP_INTERNAL_EXPAND_WITH(GMOCK_PP_INTERNAL_TAIL, (__VA_ARGS__))
// Calls CAT(_Macro, NARG(__VA_ARGS__))(__VA_ARGS__)
#define GMOCK_PP_VARIADIC_CALL(_Macro, ...) \
GMOCK_PP_INTERNAL_VARIADIC_CALL_CAT( \
GMOCK_PP_CAT(_Macro, GMOCK_PP_NARG(__VA_ARGS__))(__VA_ARGS__), )
#else // GMOCK_PP_INTERNAL_USE_MSVC
#define GMOCK_PP_NARG(...) \
GMOCK_PP_INTERNAL_INTERNAL_16TH(__VA_ARGS__, 15, 14, 13, 12, 11, 10, 9, 8, \
7, 6, 5, 4, 3, 2, 1)
#define GMOCK_PP_HAS_COMMA(...) \
GMOCK_PP_INTERNAL_INTERNAL_16TH(__VA_ARGS__, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
1, 1, 1, 1, 0)
#define GMOCK_PP_HEAD(...) GMOCK_PP_INTERNAL_HEAD(__VA_ARGS__)
#define GMOCK_PP_TAIL(...) GMOCK_PP_INTERNAL_TAIL(__VA_ARGS__)
#define GMOCK_PP_VARIADIC_CALL(_Macro, ...) \
GMOCK_PP_CAT(_Macro, GMOCK_PP_NARG(__VA_ARGS__))(__VA_ARGS__)
#endif // GMOCK_PP_INTERNAL_USE_MSVC
#define GMOCK_PP_VARIADIC_CALL(_Macro, ...) \
GMOCK_PP_INTERNAL_EXPAND_WITH( \
GMOCK_PP_CAT(_Macro, GMOCK_PP_NARG(__VA_ARGS__)), \
(__VA_ARGS__))
// If the arguments after expansion have no tokens, evaluates to `1`. Otherwise
// evaluates to `0`.
@ -192,28 +162,11 @@ static_assert(
#define GMOCK_PP_INTERNAL_IF_0(_Then, _Else) _Else
#define GMOCK_PP_INTERNAL_HEAD(_1, ...) _1
#define GMOCK_PP_INTERNAL_TAIL(_1, ...) __VA_ARGS__
#if GMOCK_PP_INTERNAL_USE_MSVC
#define GMOCK_PP_INTERNAL_NARG_CAT(_1, _2) GMOCK_PP_INTERNAL_NARG_CAT_I(_1, _2)
#define GMOCK_PP_INTERNAL_HEAD_CAT(_1, _2) GMOCK_PP_INTERNAL_HEAD_CAT_I(_1, _2)
#define GMOCK_PP_INTERNAL_HAS_COMMA_CAT(_1, _2) \
GMOCK_PP_INTERNAL_HAS_COMMA_CAT_I(_1, _2)
#define GMOCK_PP_INTERNAL_TAIL_CAT(_1, _2) GMOCK_PP_INTERNAL_TAIL_CAT_I(_1, _2)
#define GMOCK_PP_INTERNAL_VARIADIC_CALL_CAT(_1, _2) \
GMOCK_PP_INTERNAL_VARIADIC_CALL_CAT_I(_1, _2)
#define GMOCK_PP_INTERNAL_NARG_CAT_I(_1, _2) _1##_2
#define GMOCK_PP_INTERNAL_HEAD_CAT_I(_1, _2) _1##_2
#define GMOCK_PP_INTERNAL_HAS_COMMA_CAT_I(_1, _2) _1##_2
#define GMOCK_PP_INTERNAL_TAIL_CAT_I(_1, _2) _1##_2
#define GMOCK_PP_INTERNAL_VARIADIC_CALL_CAT_I(_1, _2) _1##_2
// Workaround MSVC behavior of treating __VA_ARGS__ with commas as one arg
// _Args must be wrapped in parenthesis
#define GMOCK_PP_INTERNAL_EXPAND_WITH(_Macro, _Args) _Macro _Args
#define GMOCK_PP_INTERNAL_ALTERNATE_HEAD(...) \
GMOCK_PP_INTERNAL_ALTERNATE_HEAD_CAT(GMOCK_PP_HEAD(__VA_ARGS__), )
#define GMOCK_PP_INTERNAL_ALTERNATE_HEAD_CAT(_1, _2) \
GMOCK_PP_INTERNAL_ALTERNATE_HEAD_CAT_I(_1, _2)
#define GMOCK_PP_INTERNAL_ALTERNATE_HEAD_CAT_I(_1, _2) _1##_2
#else // GMOCK_PP_INTERNAL_USE_MSVC
#define GMOCK_PP_INTERNAL_ALTERNATE_HEAD(...) GMOCK_PP_HEAD(__VA_ARGS__)
#endif // GMOCK_PP_INTERNAL_USE_MSVC
GMOCK_PP_INTERNAL_EXPAND_WITH(GMOCK_PP_HEAD, (__VA_ARGS__))
#define GMOCK_PP_INTERNAL_IBP_IS_VARIADIC_C(...) 1 _
#define GMOCK_PP_INTERNAL_IBP_IS_VARIADIC_R_1 1,