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a09ea700d3
Fix `-Wgnu-zero-variadic-macro-arguments` in GMock Passing zero arguments to the variadic part of a macro is a GNU extension and triggers warnings when build projects using GMock with `-pedantic`. - Fix uses of `GMOCK_PP_INTERNAL_16TH` to always receive at least 17 arguments. (this was triggered when `GMOCK_PP_NARG` or `GMOCK_PP_HAS_COMMA` were used with an argument containing no commas). - Fix `GMOCK_PP_HEAD` to append a dummy unused argument so that `GMOCK_PP_INTERNAL_HEAD` always has two arguments. PiperOrigin-RevId: 310414611
280 lines
13 KiB
C
280 lines
13 KiB
C
#ifndef THIRD_PARTY_GOOGLETEST_GOOGLEMOCK_INCLUDE_GMOCK_PP_H_
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#define THIRD_PARTY_GOOGLETEST_GOOGLEMOCK_INCLUDE_GMOCK_PP_H_
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// Expands and concatenates the arguments. Constructed macros reevaluate.
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#define GMOCK_PP_CAT(_1, _2) GMOCK_PP_INTERNAL_CAT(_1, _2)
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// Expands and stringifies the only argument.
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#define GMOCK_PP_STRINGIZE(...) GMOCK_PP_INTERNAL_STRINGIZE(__VA_ARGS__)
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// Returns empty. Given a variadic number of arguments.
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#define GMOCK_PP_EMPTY(...)
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// Returns a comma. Given a variadic number of arguments.
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#define GMOCK_PP_COMMA(...) ,
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// Returns the only argument.
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#define GMOCK_PP_IDENTITY(_1) _1
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// Evaluates to the number of arguments after expansion.
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//
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// #define PAIR x, y
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//
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// GMOCK_PP_NARG() => 1
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// GMOCK_PP_NARG(x) => 1
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// GMOCK_PP_NARG(x, y) => 2
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// GMOCK_PP_NARG(PAIR) => 2
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//
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// Requires: the number of arguments after expansion is at most 15.
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#define GMOCK_PP_NARG(...) \
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GMOCK_PP_INTERNAL_16TH( \
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(__VA_ARGS__, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0))
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// Returns 1 if the expansion of arguments has an unprotected comma. Otherwise
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// returns 0. Requires no more than 15 unprotected commas.
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#define GMOCK_PP_HAS_COMMA(...) \
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GMOCK_PP_INTERNAL_16TH( \
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(__VA_ARGS__, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0))
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// Returns the first argument.
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#define GMOCK_PP_HEAD(...) GMOCK_PP_INTERNAL_HEAD((__VA_ARGS__, unusedArg))
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// Returns the tail. A variadic list of all arguments minus the first. Requires
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// at least one argument.
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#define GMOCK_PP_TAIL(...) GMOCK_PP_INTERNAL_TAIL((__VA_ARGS__))
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// Calls CAT(_Macro, NARG(__VA_ARGS__))(__VA_ARGS__)
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#define GMOCK_PP_VARIADIC_CALL(_Macro, ...) \
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GMOCK_PP_IDENTITY( \
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GMOCK_PP_CAT(_Macro, GMOCK_PP_NARG(__VA_ARGS__))(__VA_ARGS__))
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// If the arguments after expansion have no tokens, evaluates to `1`. Otherwise
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// evaluates to `0`.
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//
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// Requires: * the number of arguments after expansion is at most 15.
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// * If the argument is a macro, it must be able to be called with one
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// argument.
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//
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// Implementation details:
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//
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// There is one case when it generates a compile error: if the argument is macro
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// that cannot be called with one argument.
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//
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// #define M(a, b) // it doesn't matter what it expands to
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//
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// // Expected: expands to `0`.
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// // Actual: compile error.
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// GMOCK_PP_IS_EMPTY(M)
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//
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// There are 4 cases tested:
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//
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// * __VA_ARGS__ possible expansion has no unparen'd commas. Expected 0.
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// * __VA_ARGS__ possible expansion is not enclosed in parenthesis. Expected 0.
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// * __VA_ARGS__ possible expansion is not a macro that ()-evaluates to a comma.
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// Expected 0
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// * __VA_ARGS__ is empty, or has unparen'd commas, or is enclosed in
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// parenthesis, or is a macro that ()-evaluates to comma. Expected 1.
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//
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// We trigger detection on '0001', i.e. on empty.
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#define GMOCK_PP_IS_EMPTY(...) \
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GMOCK_PP_INTERNAL_IS_EMPTY(GMOCK_PP_HAS_COMMA(__VA_ARGS__), \
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GMOCK_PP_HAS_COMMA(GMOCK_PP_COMMA __VA_ARGS__), \
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GMOCK_PP_HAS_COMMA(__VA_ARGS__()), \
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GMOCK_PP_HAS_COMMA(GMOCK_PP_COMMA __VA_ARGS__()))
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// Evaluates to _Then if _Cond is 1 and _Else if _Cond is 0.
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#define GMOCK_PP_IF(_Cond, _Then, _Else) \
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GMOCK_PP_CAT(GMOCK_PP_INTERNAL_IF_, _Cond)(_Then, _Else)
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// Similar to GMOCK_PP_IF but takes _Then and _Else in parentheses.
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//
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// GMOCK_PP_GENERIC_IF(1, (a, b, c), (d, e, f)) => a, b, c
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// GMOCK_PP_GENERIC_IF(0, (a, b, c), (d, e, f)) => d, e, f
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//
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#define GMOCK_PP_GENERIC_IF(_Cond, _Then, _Else) \
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GMOCK_PP_REMOVE_PARENS(GMOCK_PP_IF(_Cond, _Then, _Else))
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// Evaluates to the number of arguments after expansion. Identifies 'empty' as
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// 0.
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//
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// #define PAIR x, y
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//
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// GMOCK_PP_NARG0() => 0
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// GMOCK_PP_NARG0(x) => 1
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// GMOCK_PP_NARG0(x, y) => 2
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// GMOCK_PP_NARG0(PAIR) => 2
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//
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// Requires: * the number of arguments after expansion is at most 15.
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// * If the argument is a macro, it must be able to be called with one
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// argument.
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#define GMOCK_PP_NARG0(...) \
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GMOCK_PP_IF(GMOCK_PP_IS_EMPTY(__VA_ARGS__), 0, GMOCK_PP_NARG(__VA_ARGS__))
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// Expands to 1 if the first argument starts with something in parentheses,
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// otherwise to 0.
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#define GMOCK_PP_IS_BEGIN_PARENS(...) \
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GMOCK_PP_HEAD(GMOCK_PP_CAT(GMOCK_PP_INTERNAL_IBP_IS_VARIADIC_R_, \
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GMOCK_PP_INTERNAL_IBP_IS_VARIADIC_C __VA_ARGS__))
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// Expands to 1 is there is only one argument and it is enclosed in parentheses.
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#define GMOCK_PP_IS_ENCLOSED_PARENS(...) \
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GMOCK_PP_IF(GMOCK_PP_IS_BEGIN_PARENS(__VA_ARGS__), \
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GMOCK_PP_IS_EMPTY(GMOCK_PP_EMPTY __VA_ARGS__), 0)
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// Remove the parens, requires GMOCK_PP_IS_ENCLOSED_PARENS(args) => 1.
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#define GMOCK_PP_REMOVE_PARENS(...) GMOCK_PP_INTERNAL_REMOVE_PARENS __VA_ARGS__
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// Expands to _Macro(0, _Data, e1) _Macro(1, _Data, e2) ... _Macro(K -1, _Data,
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// eK) as many of GMOCK_INTERNAL_NARG0 _Tuple.
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// Requires: * |_Macro| can be called with 3 arguments.
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// * |_Tuple| expansion has no more than 15 elements.
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#define GMOCK_PP_FOR_EACH(_Macro, _Data, _Tuple) \
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GMOCK_PP_CAT(GMOCK_PP_INTERNAL_FOR_EACH_IMPL_, GMOCK_PP_NARG0 _Tuple) \
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(0, _Macro, _Data, _Tuple)
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// Expands to _Macro(0, _Data, ) _Macro(1, _Data, ) ... _Macro(K - 1, _Data, )
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// Empty if _K = 0.
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// Requires: * |_Macro| can be called with 3 arguments.
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// * |_K| literal between 0 and 15
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#define GMOCK_PP_REPEAT(_Macro, _Data, _N) \
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GMOCK_PP_CAT(GMOCK_PP_INTERNAL_FOR_EACH_IMPL_, _N) \
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(0, _Macro, _Data, GMOCK_PP_INTENRAL_EMPTY_TUPLE)
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// Increments the argument, requires the argument to be between 0 and 15.
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#define GMOCK_PP_INC(_i) GMOCK_PP_CAT(GMOCK_PP_INTERNAL_INC_, _i)
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// Returns comma if _i != 0. Requires _i to be between 0 and 15.
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#define GMOCK_PP_COMMA_IF(_i) GMOCK_PP_CAT(GMOCK_PP_INTERNAL_COMMA_IF_, _i)
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// Internal details follow. Do not use any of these symbols outside of this
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// file or we will break your code.
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#define GMOCK_PP_INTENRAL_EMPTY_TUPLE (, , , , , , , , , , , , , , , )
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#define GMOCK_PP_INTERNAL_CAT(_1, _2) _1##_2
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#define GMOCK_PP_INTERNAL_STRINGIZE(...) #__VA_ARGS__
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#define GMOCK_PP_INTERNAL_CAT_5(_1, _2, _3, _4, _5) _1##_2##_3##_4##_5
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#define GMOCK_PP_INTERNAL_IS_EMPTY(_1, _2, _3, _4) \
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GMOCK_PP_HAS_COMMA(GMOCK_PP_INTERNAL_CAT_5(GMOCK_PP_INTERNAL_IS_EMPTY_CASE_, \
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_1, _2, _3, _4))
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#define GMOCK_PP_INTERNAL_IS_EMPTY_CASE_0001 ,
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#define GMOCK_PP_INTERNAL_IF_1(_Then, _Else) _Then
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#define GMOCK_PP_INTERNAL_IF_0(_Then, _Else) _Else
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// Because of MSVC treating a token with a comma in it as a single token when
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// passed to another macro, we need to force it to evaluate it as multiple
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// tokens. We do that by using a "IDENTITY(MACRO PARENTHESIZED_ARGS)" macro. We
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// define one per possible macro that relies on this behavior. Note "_Args" must
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// be parenthesized.
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#define GMOCK_PP_INTERNAL_INTERNAL_16TH(_1, _2, _3, _4, _5, _6, _7, _8, _9, \
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_10, _11, _12, _13, _14, _15, _16, \
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...) \
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_16
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#define GMOCK_PP_INTERNAL_16TH(_Args) \
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GMOCK_PP_IDENTITY(GMOCK_PP_INTERNAL_INTERNAL_16TH _Args)
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#define GMOCK_PP_INTERNAL_INTERNAL_HEAD(_1, ...) _1
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#define GMOCK_PP_INTERNAL_HEAD(_Args) \
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GMOCK_PP_IDENTITY(GMOCK_PP_INTERNAL_INTERNAL_HEAD _Args)
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#define GMOCK_PP_INTERNAL_INTERNAL_TAIL(_1, ...) __VA_ARGS__
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#define GMOCK_PP_INTERNAL_TAIL(_Args) \
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GMOCK_PP_IDENTITY(GMOCK_PP_INTERNAL_INTERNAL_TAIL _Args)
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#define GMOCK_PP_INTERNAL_IBP_IS_VARIADIC_C(...) 1 _
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#define GMOCK_PP_INTERNAL_IBP_IS_VARIADIC_R_1 1,
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#define GMOCK_PP_INTERNAL_IBP_IS_VARIADIC_R_GMOCK_PP_INTERNAL_IBP_IS_VARIADIC_C \
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0,
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#define GMOCK_PP_INTERNAL_REMOVE_PARENS(...) __VA_ARGS__
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#define GMOCK_PP_INTERNAL_INC_0 1
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#define GMOCK_PP_INTERNAL_INC_1 2
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#define GMOCK_PP_INTERNAL_INC_2 3
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#define GMOCK_PP_INTERNAL_INC_3 4
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#define GMOCK_PP_INTERNAL_INC_4 5
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#define GMOCK_PP_INTERNAL_INC_5 6
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#define GMOCK_PP_INTERNAL_INC_6 7
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#define GMOCK_PP_INTERNAL_INC_7 8
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#define GMOCK_PP_INTERNAL_INC_8 9
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#define GMOCK_PP_INTERNAL_INC_9 10
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#define GMOCK_PP_INTERNAL_INC_10 11
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#define GMOCK_PP_INTERNAL_INC_11 12
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#define GMOCK_PP_INTERNAL_INC_12 13
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#define GMOCK_PP_INTERNAL_INC_13 14
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#define GMOCK_PP_INTERNAL_INC_14 15
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#define GMOCK_PP_INTERNAL_INC_15 16
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#define GMOCK_PP_INTERNAL_COMMA_IF_0
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#define GMOCK_PP_INTERNAL_COMMA_IF_1 ,
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#define GMOCK_PP_INTERNAL_COMMA_IF_2 ,
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#define GMOCK_PP_INTERNAL_COMMA_IF_3 ,
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#define GMOCK_PP_INTERNAL_COMMA_IF_4 ,
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#define GMOCK_PP_INTERNAL_COMMA_IF_5 ,
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#define GMOCK_PP_INTERNAL_COMMA_IF_6 ,
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#define GMOCK_PP_INTERNAL_COMMA_IF_7 ,
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#define GMOCK_PP_INTERNAL_COMMA_IF_8 ,
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#define GMOCK_PP_INTERNAL_COMMA_IF_9 ,
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#define GMOCK_PP_INTERNAL_COMMA_IF_10 ,
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#define GMOCK_PP_INTERNAL_COMMA_IF_11 ,
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#define GMOCK_PP_INTERNAL_COMMA_IF_12 ,
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#define GMOCK_PP_INTERNAL_COMMA_IF_13 ,
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#define GMOCK_PP_INTERNAL_COMMA_IF_14 ,
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#define GMOCK_PP_INTERNAL_COMMA_IF_15 ,
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#define GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, _element) \
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_Macro(_i, _Data, _element)
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#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_0(_i, _Macro, _Data, _Tuple)
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#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_1(_i, _Macro, _Data, _Tuple) \
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GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple)
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#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_2(_i, _Macro, _Data, _Tuple) \
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GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
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GMOCK_PP_INTERNAL_FOR_EACH_IMPL_1(GMOCK_PP_INC(_i), _Macro, _Data, \
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(GMOCK_PP_TAIL _Tuple))
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#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_3(_i, _Macro, _Data, _Tuple) \
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GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
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GMOCK_PP_INTERNAL_FOR_EACH_IMPL_2(GMOCK_PP_INC(_i), _Macro, _Data, \
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(GMOCK_PP_TAIL _Tuple))
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#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_4(_i, _Macro, _Data, _Tuple) \
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GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
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GMOCK_PP_INTERNAL_FOR_EACH_IMPL_3(GMOCK_PP_INC(_i), _Macro, _Data, \
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(GMOCK_PP_TAIL _Tuple))
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#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_5(_i, _Macro, _Data, _Tuple) \
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GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
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GMOCK_PP_INTERNAL_FOR_EACH_IMPL_4(GMOCK_PP_INC(_i), _Macro, _Data, \
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(GMOCK_PP_TAIL _Tuple))
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#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_6(_i, _Macro, _Data, _Tuple) \
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GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
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GMOCK_PP_INTERNAL_FOR_EACH_IMPL_5(GMOCK_PP_INC(_i), _Macro, _Data, \
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(GMOCK_PP_TAIL _Tuple))
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#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_7(_i, _Macro, _Data, _Tuple) \
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GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
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GMOCK_PP_INTERNAL_FOR_EACH_IMPL_6(GMOCK_PP_INC(_i), _Macro, _Data, \
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(GMOCK_PP_TAIL _Tuple))
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#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_8(_i, _Macro, _Data, _Tuple) \
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GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
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GMOCK_PP_INTERNAL_FOR_EACH_IMPL_7(GMOCK_PP_INC(_i), _Macro, _Data, \
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(GMOCK_PP_TAIL _Tuple))
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#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_9(_i, _Macro, _Data, _Tuple) \
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GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
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GMOCK_PP_INTERNAL_FOR_EACH_IMPL_8(GMOCK_PP_INC(_i), _Macro, _Data, \
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(GMOCK_PP_TAIL _Tuple))
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#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_10(_i, _Macro, _Data, _Tuple) \
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GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
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GMOCK_PP_INTERNAL_FOR_EACH_IMPL_9(GMOCK_PP_INC(_i), _Macro, _Data, \
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(GMOCK_PP_TAIL _Tuple))
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#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_11(_i, _Macro, _Data, _Tuple) \
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GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
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GMOCK_PP_INTERNAL_FOR_EACH_IMPL_10(GMOCK_PP_INC(_i), _Macro, _Data, \
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(GMOCK_PP_TAIL _Tuple))
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#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_12(_i, _Macro, _Data, _Tuple) \
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GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
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GMOCK_PP_INTERNAL_FOR_EACH_IMPL_11(GMOCK_PP_INC(_i), _Macro, _Data, \
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(GMOCK_PP_TAIL _Tuple))
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#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_13(_i, _Macro, _Data, _Tuple) \
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GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
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GMOCK_PP_INTERNAL_FOR_EACH_IMPL_12(GMOCK_PP_INC(_i), _Macro, _Data, \
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(GMOCK_PP_TAIL _Tuple))
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#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_14(_i, _Macro, _Data, _Tuple) \
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GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
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GMOCK_PP_INTERNAL_FOR_EACH_IMPL_13(GMOCK_PP_INC(_i), _Macro, _Data, \
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(GMOCK_PP_TAIL _Tuple))
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#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_15(_i, _Macro, _Data, _Tuple) \
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GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
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GMOCK_PP_INTERNAL_FOR_EACH_IMPL_14(GMOCK_PP_INC(_i), _Macro, _Data, \
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(GMOCK_PP_TAIL _Tuple))
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#endif // THIRD_PARTY_GOOGLETEST_GOOGLEMOCK_INCLUDE_GMOCK_INTERNAL_GMOCK_PP_H_
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