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
22namespace __asan {
23
24static const u32 kDefaultMallocContextSize = 30;
25
26void SetMallocContextSize(u32 size);
27u32 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