1 //===-- asan_stack.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 // This file is a part of AddressSanitizer, an address sanity checker. 10 // 11 // ASan-private header for asan_stack.cpp. 12 //===----------------------------------------------------------------------===// 13 14 #ifndef ASAN_STACK_H 15 #define ASAN_STACK_H 16 17 #include "asan_flags.h" 18 #include "asan_thread.h" 19 #include "sanitizer_common/sanitizer_flags.h" 20 #include "sanitizer_common/sanitizer_stacktrace.h" 21 22 namespace __asan { 23 24 static const u32 kDefaultMallocContextSize = 30; 25 26 void SetMallocContextSize(u32 size); 27 u32 GetMallocContextSize(); 28 29 } // namespace __asan 30 31 // NOTE: A Rule of thumb is to retrieve stack trace in the interceptors 32 // as early as possible (in functions exposed to the user), as we generally 33 // don't want stack trace to contain functions from ASan internals. 34 35 #define GET_STACK_TRACE(max_size, fast) \ 36 BufferedStackTrace stack; \ 37 if (max_size <= 2) { \ 38 stack.size = max_size; \ 39 if (max_size > 0) { \ 40 stack.top_frame_bp = GET_CURRENT_FRAME(); \ 41 stack.trace_buffer[0] = StackTrace::GetCurrentPc(); \ 42 if (max_size > 1) stack.trace_buffer[1] = GET_CALLER_PC(); \ 43 } \ 44 } else { \ 45 stack.Unwind(StackTrace::GetCurrentPc(), \ 46 GET_CURRENT_FRAME(), nullptr, fast, max_size); \ 47 } 48 49 #define GET_STACK_TRACE_FATAL(pc, bp) \ 50 BufferedStackTrace stack; \ 51 stack.Unwind(pc, bp, nullptr, \ 52 common_flags()->fast_unwind_on_fatal) 53 54 #define GET_STACK_TRACE_FATAL_HERE \ 55 GET_STACK_TRACE(kStackTraceMax, common_flags()->fast_unwind_on_fatal) 56 57 #define GET_STACK_TRACE_THREAD \ 58 GET_STACK_TRACE(kStackTraceMax, true) 59 60 #define GET_STACK_TRACE_MALLOC \ 61 GET_STACK_TRACE(GetMallocContextSize(), common_flags()->fast_unwind_on_malloc) 62 63 #define GET_STACK_TRACE_FREE GET_STACK_TRACE_MALLOC 64 65 #define PRINT_CURRENT_STACK() \ 66 { \ 67 GET_STACK_TRACE_FATAL_HERE; \ 68 stack.Print(); \ 69 } 70 71 #endif // ASAN_STACK_H 72