1 //===-- options.h -----------------------------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef GWP_ASAN_OPTIONS_H_ 10 #define GWP_ASAN_OPTIONS_H_ 11 12 #include <stddef.h> 13 #include <stdint.h> 14 15 namespace gwp_asan { 16 namespace options { 17 // ================================ Requirements =============================== 18 // This function is required to be either implemented by the supporting 19 // allocator, or one of the two provided implementations may be used 20 // (RTGwpAsanBacktraceLibc or RTGwpAsanBacktraceSanitizerCommon). 21 // ================================ Description ================================ 22 // This function shall collect the backtrace for the calling thread and place 23 // the result in `TraceBuffer`. This function should elide itself and all frames 24 // below itself from `TraceBuffer`, i.e. the caller's frame should be in 25 // TraceBuffer[0], and subsequent frames 1..n into TraceBuffer[1..n], where a 26 // maximum of `Size` frames are stored. Returns the number of frames stored into 27 // `TraceBuffer`, and zero on failure. If the return value of this function is 28 // equal to `Size`, it may indicate that the backtrace is truncated. 29 // =================================== Notes =================================== 30 // This function may directly or indirectly call malloc(), as the 31 // GuardedPoolAllocator contains a reentrancy barrier to prevent infinite 32 // recursion. Any allocation made inside this function will be served by the 33 // supporting allocator, and will not have GWP-ASan protections. 34 typedef size_t (*Backtrace_t)(uintptr_t *TraceBuffer, size_t Size); 35 36 struct Options { 37 Backtrace_t Backtrace = nullptr; 38 39 // Read the options from the included definitions file. 40 #define GWP_ASAN_OPTION(Type, Name, DefaultValue, Description) \ 41 Type Name = DefaultValue; 42 #include "gwp_asan/options.inc" 43 #undef GWP_ASAN_OPTION 44 setDefaultsOptions45 void setDefaults() { 46 #define GWP_ASAN_OPTION(Type, Name, DefaultValue, Description) \ 47 Name = DefaultValue; 48 #include "gwp_asan/options.inc" 49 #undef GWP_ASAN_OPTION 50 51 Backtrace = nullptr; 52 } 53 }; 54 } // namespace options 55 } // namespace gwp_asan 56 57 #endif // GWP_ASAN_OPTIONS_H_ 58