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1 //===-- sanitizer_win_weak_interception.h ---------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 // This header provide helper macros to delegate calls of weak functions to the
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9 // implementation in the main executable when a strong definition is present.
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10 //===----------------------------------------------------------------------===//
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11 #ifndef SANITIZER_WIN_WEAK_INTERCEPTION_H
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12 #define SANITIZER_WIN_WEAK_INTERCEPTION_H
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13 #include "sanitizer_internal_defs.h"
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14
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15 namespace __sanitizer {
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16 int interceptWhenPossible(uptr dll_function, const char *real_function);
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17 }
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18
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19 // ----------------- Function interception helper macros -------------------- //
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20 // Weak functions, could be redefined in the main executable, but that is not
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21 // necessary, so we shouldn't die if we can not find a reference.
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22 #define INTERCEPT_WEAK(Name) interceptWhenPossible((uptr) Name, #Name);
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23
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24 #define INTERCEPT_SANITIZER_WEAK_FUNCTION(Name) \
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25 static int intercept_##Name() { \
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26 return __sanitizer::interceptWhenPossible((__sanitizer::uptr) Name, #Name);\
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27 } \
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28 __pragma(section(".WEAK$M", long, read)) \
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29 __declspec(allocate(".WEAK$M")) int (*__weak_intercept_##Name)() = \
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30 intercept_##Name;
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31
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32 #endif // SANITIZER_WIN_WEAK_INTERCEPTION_H
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