src/libcompiler_builtins/compiler-rt/lib/asan/asan_stack.h

   1 //===-- asan_stack.h --------------------------------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file is a part of AddressSanitizer, an address sanity checker.
  11 //
  12 // ASan-private header for asan_stack.cc.
  13 //===----------------------------------------------------------------------===//
  14
  15 #ifndef ASAN_STACK_H
  16 #define ASAN_STACK_H
  17
  18 #include "asan_flags.h"
  19 #include "asan_thread.h"
  20 #include "sanitizer_common/sanitizer_flags.h"
  21 #include "sanitizer_common/sanitizer_stacktrace.h"
  22
  23 namespace __asan {
  24
  25 static const u32 kDefaultMallocContextSize = 30;
  26
  27 void SetMallocContextSize(u32 size);
  28 u32 GetMallocContextSize();
  29
  30 // Get the stack trace with the given pc and bp.
  31 // The pc will be in the position 0 of the resulting stack trace.
  32 // The bp may refer to the current frame or to the caller's frame.
  33 ALWAYS_INLINE
  34 void GetStackTrace(BufferedStackTrace *stack, uptr max_depth, uptr pc, uptr bp,
  35                    void *context, bool fast) {
  36 #if SANITIZER_WINDOWS
  37   stack->Unwind(max_depth, pc, bp, context, 0, 0, fast);
  38 #else
  39   AsanThread *t;
  40   stack->size = 0;
  41   if (LIKELY(asan_inited)) {
  42     if ((t = GetCurrentThread()) && !t->isUnwinding()) {
  43       uptr stack_top = t->stack_top();
  44       uptr stack_bottom = t->stack_bottom();
  45       ScopedUnwinding unwind_scope(t);
  46       if (!SANITIZER_MIPS || IsValidFrame(bp, stack_top, stack_bottom)) {
  47         stack->Unwind(max_depth, pc, bp, context, stack_top, stack_bottom,
  48                       fast);
  49       }
  50     } else if (!t && !fast) {
  51       /* If GetCurrentThread() has failed, try to do slow unwind anyways. */
  52       stack->Unwind(max_depth, pc, bp, context, 0, 0, false);
  53     }
  54   }
  55 #endif // SANITIZER_WINDOWS
  56 }
  57
  58 } // namespace __asan
  59
  60 // NOTE: A Rule of thumb is to retrieve stack trace in the interceptors
  61 // as early as possible (in functions exposed to the user), as we generally
  62 // don't want stack trace to contain functions from ASan internals.
  63
  64 #define GET_STACK_TRACE(max_size, fast)                          \
  65   BufferedStackTrace stack;                                      \
  66   if (max_size <= 2) {                                           \
  67     stack.size = max_size;                                       \
  68     if (max_size > 0) {                                          \
  69       stack.top_frame_bp = GET_CURRENT_FRAME();                  \
  70       stack.trace_buffer[0] = StackTrace::GetCurrentPc();        \
  71       if (max_size > 1) stack.trace_buffer[1] = GET_CALLER_PC(); \
  72     }                                                            \
  73   } else {                                                       \
  74     GetStackTrace(&stack, max_size, StackTrace::GetCurrentPc(),  \
  75                   GET_CURRENT_FRAME(), 0, fast);                 \
  76   }
  77
  78 #define GET_STACK_TRACE_FATAL(pc, bp)              \
  79   BufferedStackTrace stack;                        \
  80   GetStackTrace(&stack, kStackTraceMax, pc, bp, 0, \
  81                 common_flags()->fast_unwind_on_fatal)
  82
  83 #define GET_STACK_TRACE_SIGNAL(sig)                                        \
  84   BufferedStackTrace stack;                                                \
  85   GetStackTrace(&stack, kStackTraceMax, (sig).pc, (sig).bp, (sig).context, \
  86                 common_flags()->fast_unwind_on_fatal)
  87
  88 #define GET_STACK_TRACE_FATAL_HERE                                \
  89   GET_STACK_TRACE(kStackTraceMax, common_flags()->fast_unwind_on_fatal)
  90
  91 #define GET_STACK_TRACE_CHECK_HERE                                \
  92   GET_STACK_TRACE(kStackTraceMax, common_flags()->fast_unwind_on_check)
  93
  94 #define GET_STACK_TRACE_THREAD                                    \
  95   GET_STACK_TRACE(kStackTraceMax, true)
  96
  97 #define GET_STACK_TRACE_MALLOC                                                 \
  98   GET_STACK_TRACE(GetMallocContextSize(), common_flags()->fast_unwind_on_malloc)
  99
 100 #define GET_STACK_TRACE_FREE GET_STACK_TRACE_MALLOC
 101
 102 #define PRINT_CURRENT_STACK()   \
 103   {                             \
 104     GET_STACK_TRACE_FATAL_HERE; \
 105     stack.Print();              \
 106   }
 107
 108 #define PRINT_CURRENT_STACK_CHECK() \
 109   {                                 \
 110     GET_STACK_TRACE_CHECK_HERE;     \
 111     stack.Print();                  \
 112   }
 113
 114 #endif // ASAN_STACK_H