--- /dev/null
+/*
+ * Copyright 2018 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * GULOriginalIMPConvenienceMacros.h
+ *
+ * This header contains convenience macros for invoking the original IMP of a swizzled method.
+ */
+
+/**
+ * Invokes original IMP when the original selector takes no arguments.
+ *
+ * @param __receivingObject The object on which the IMP is invoked.
+ * @param __swizzledSEL The selector used for swizzling.
+ * @param __returnType The return type of the original implementation.
+ * @param __originalIMP The original IMP.
+ */
+#define GUL_INVOKE_ORIGINAL_IMP0(__receivingObject, __swizzledSEL, __returnType, __originalIMP) \
+ ((__returnType(*)(id, SEL))__originalIMP)(__receivingObject, __swizzledSEL)
+
+/**
+ * Invokes original IMP when the original selector takes 1 argument.
+ *
+ * @param __receivingObject The object on which the IMP is invoked.
+ * @param __swizzledSEL The selector used for swizzling.
+ * @param __returnType The return type of the original implementation.
+ * @param __originalIMP The original IMP.
+ * @param __arg1 The first argument.
+ */
+#define GUL_INVOKE_ORIGINAL_IMP1(__receivingObject, __swizzledSEL, __returnType, __originalIMP, \
+ __arg1) \
+ ((__returnType(*)(id, SEL, __typeof__(__arg1)))__originalIMP)(__receivingObject, __swizzledSEL, \
+ __arg1)
+
+/**
+ * Invokes original IMP when the original selector takes 2 arguments.
+ *
+ * @param __receivingObject The object on which the IMP is invoked.
+ * @param __swizzledSEL The selector used for swizzling.
+ * @param __returnType The return type of the original implementation.
+ * @param __originalIMP The original IMP.
+ * @param __arg1 The first argument.
+ * @param __arg2 The second argument.
+ */
+#define GUL_INVOKE_ORIGINAL_IMP2(__receivingObject, __swizzledSEL, __returnType, __originalIMP, \
+ __arg1, __arg2) \
+ ((__returnType(*)(id, SEL, __typeof__(__arg1), __typeof__(__arg2)))__originalIMP)( \
+ __receivingObject, __swizzledSEL, __arg1, __arg2)
+
+/**
+ * Invokes original IMP when the original selector takes 3 arguments.
+ *
+ * @param __receivingObject The object on which the IMP is invoked.
+ * @param __swizzledSEL The selector used for swizzling.
+ * @param __returnType The return type of the original implementation.
+ * @param __originalIMP The original IMP.
+ * @param __arg1 The first argument.
+ * @param __arg2 The second argument.
+ * @param __arg3 The third argument.
+ */
+#define GUL_INVOKE_ORIGINAL_IMP3(__receivingObject, __swizzledSEL, __returnType, __originalIMP, \
+ __arg1, __arg2, __arg3) \
+ ((__returnType(*)(id, SEL, __typeof__(__arg1), __typeof__(__arg2), \
+ __typeof__(__arg3)))__originalIMP)(__receivingObject, __swizzledSEL, __arg1, \
+ __arg2, __arg3)
+
+/**
+ * Invokes original IMP when the original selector takes 4 arguments.
+ *
+ * @param __receivingObject The object on which the IMP is invoked.
+ * @param __swizzledSEL The selector used for swizzling.
+ * @param __returnType The return type of the original implementation.
+ * @param __originalIMP The original IMP.
+ * @param __arg1 The first argument.
+ * @param __arg2 The second argument.
+ * @param __arg3 The third argument.
+ * @param __arg4 The fourth argument.
+ */
+#define GUL_INVOKE_ORIGINAL_IMP4(__receivingObject, __swizzledSEL, __returnType, __originalIMP, \
+ __arg1, __arg2, __arg3, __arg4) \
+ ((__returnType(*)(id, SEL, __typeof__(__arg1), __typeof__(__arg2), __typeof__(__arg3), \
+ __typeof__(__arg4)))__originalIMP)(__receivingObject, __swizzledSEL, __arg1, \
+ __arg2, __arg3, __arg4)
+
+/**
+ * Invokes original IMP when the original selector takes 5 arguments.
+ *
+ * @param __receivingObject The object on which the IMP is invoked.
+ * @param __swizzledSEL The selector used for swizzling.
+ * @param __returnType The return type of the original implementation.
+ * @param __originalIMP The original IMP.
+ * @param __arg1 The first argument.
+ * @param __arg2 The second argument.
+ * @param __arg3 The third argument.
+ * @param __arg4 The fourth argument.
+ * @param __arg5 The fifth argument.
+ */
+#define GUL_INVOKE_ORIGINAL_IMP5(__receivingObject, __swizzledSEL, __returnType, __originalIMP, \
+ __arg1, __arg2, __arg3, __arg4, __arg5) \
+ ((__returnType(*)(id, SEL, __typeof__(__arg1), __typeof__(__arg2), __typeof__(__arg3), \
+ __typeof__(__arg4), __typeof__(__arg5)))__originalIMP)( \
+ __receivingObject, __swizzledSEL, __arg1, __arg2, __arg3, __arg4, __arg5)
+
+/**
+ * Invokes original IMP when the original selector takes 6 arguments.
+ *
+ * @param __receivingObject The object on which the IMP is invoked.
+ * @param __swizzledSEL The selector used for swizzling.
+ * @param __returnType The return type of the original implementation.
+ * @param __originalIMP The original IMP.
+ * @param __arg1 The first argument.
+ * @param __arg2 The second argument.
+ * @param __arg3 The third argument.
+ * @param __arg4 The fourth argument.
+ * @param __arg5 The fifth argument.
+ * @param __arg6 The sixth argument.
+ */
+#define GUL_INVOKE_ORIGINAL_IMP6(__receivingObject, __swizzledSEL, __returnType, __originalIMP, \
+ __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \
+ ((__returnType(*)(id, SEL, __typeof__(__arg1), __typeof__(__arg2), __typeof__(__arg3), \
+ __typeof__(__arg4), __typeof__(__arg5), __typeof__(__arg6)))__originalIMP)( \
+ __receivingObject, __swizzledSEL, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6)
+
+/**
+ * Invokes original IMP when the original selector takes 7 arguments.
+ *
+ * @param __receivingObject The object on which the IMP is invoked.
+ * @param __swizzledSEL The selector used for swizzling.
+ * @param __returnType The return type of the original implementation.
+ * @param __originalIMP The original IMP.
+ * @param __arg1 The first argument.
+ * @param __arg2 The second argument.
+ * @param __arg3 The third argument.
+ * @param __arg4 The fourth argument.
+ * @param __arg5 The fifth argument.
+ * @param __arg6 The sixth argument.
+ * @param __arg7 The seventh argument.
+ */
+#define GUL_INVOKE_ORIGINAL_IMP7(__receivingObject, __swizzledSEL, __returnType, __originalIMP, \
+ __arg1, __arg2, __arg3, __arg4, __arg5, __arg6, __arg7) \
+ ((__returnType(*)(id, SEL, __typeof__(__arg1), __typeof__(__arg2), __typeof__(__arg3), \
+ __typeof__(__arg4), __typeof__(__arg5), __typeof__(__arg6), \
+ __typeof__(__arg7)))__originalIMP)( \
+ __receivingObject, __swizzledSEL, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6, __arg7)
+
+/**
+ * Invokes original IMP when the original selector takes 8 arguments.
+ *
+ * @param __receivingObject The object on which the IMP is invoked.
+ * @param __swizzledSEL The selector used for swizzling.
+ * @param __returnType The return type of the original implementation.
+ * @param __originalIMP The original IMP.
+ * @param __arg1 The first argument.
+ * @param __arg2 The second argument.
+ * @param __arg3 The third argument.
+ * @param __arg4 The fourth argument.
+ * @param __arg5 The fifth argument.
+ * @param __arg6 The sixth argument.
+ * @param __arg7 The seventh argument.
+ * @param __arg8 The eighth argument.
+ */
+#define GUL_INVOKE_ORIGINAL_IMP8(__receivingObject, __swizzledSEL, __returnType, __originalIMP, \
+ __arg1, __arg2, __arg3, __arg4, __arg5, __arg6, __arg7, __arg8) \
+ ((__returnType(*)(id, SEL, __typeof__(__arg1), __typeof__(__arg2), __typeof__(__arg3), \
+ __typeof__(__arg4), __typeof__(__arg5), __typeof__(__arg6), \
+ __typeof__(__arg7), __typeof__(__arg8)))__originalIMP)( \
+ __receivingObject, __swizzledSEL, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6, __arg7, \
+ __arg8)
+
+/**
+ * Invokes original IMP when the original selector takes 9 arguments.
+ *
+ * @param __receivingObject The object on which the IMP is invoked.
+ * @param __swizzledSEL The selector used for swizzling.
+ * @param __returnType The return type of the original implementation.
+ * @param __originalIMP The original IMP.
+ * @param __arg1 The first argument.
+ * @param __arg2 The second argument.
+ * @param __arg3 The third argument.
+ * @param __arg4 The fourth argument.
+ * @param __arg5 The fifth argument.
+ * @param __arg6 The sixth argument.
+ * @param __arg7 The seventh argument.
+ * @param __arg8 The eighth argument.
+ * @param __arg9 The ninth argument.
+ */
+#define GUL_INVOKE_ORIGINAL_IMP9(__receivingObject, __swizzledSEL, __returnType, __originalIMP, \
+ __arg1, __arg2, __arg3, __arg4, __arg5, __arg6, __arg7, __arg8, \
+ __arg9) \
+ ((__returnType(*)(id, SEL, __typeof__(__arg1), __typeof__(__arg2), __typeof__(__arg3), \
+ __typeof__(__arg4), __typeof__(__arg5), __typeof__(__arg6), \
+ __typeof__(__arg7), __typeof__(__arg8), __typeof__(__arg9)))__originalIMP)( \
+ __receivingObject, __swizzledSEL, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6, __arg7, \
+ __arg8, __arg9)