libsanitizer/asan/asan_stack.h

   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   UNINITIALIZED 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)                                                    \
  43         stack.trace_buffer[1] = GET_CALLER_PC();                           \
  44     }                                                                      \
  45   } else {                                                                 \
  46     stack.Unwind(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME(), nullptr, \
  47                  fast, max_size);                                          \
  48   }
  49
  50 #define GET_STACK_TRACE_FATAL(pc, bp)     \
  51   UNINITIALIZED BufferedStackTrace stack; \
  52   stack.Unwind(pc, bp, nullptr, 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