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