libsanitizer/ubsan/ubsan_handlers_cxx.cc

   1 //===-- ubsan_handlers_cxx.cc ---------------------------------------------===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // Error logging entry points for the UBSan runtime, which are only used for C++
   9 // compilations. This file is permitted to use language features which require
  10 // linking against a C++ ABI library.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "ubsan_handlers_cxx.h"
  15 #include "ubsan_diag.h"
  16 #include "ubsan_type_hash.h"
  17
  18 #include "sanitizer_common/sanitizer_common.h"
  19
  20 using namespace __sanitizer;
  21 using namespace __ubsan;
  22
  23 namespace __ubsan {
  24   extern const char *TypeCheckKinds[];
  25 }
  26
  27 static void HandleDynamicTypeCacheMiss(
  28     DynamicTypeCacheMissData *Data, ValueHandle Pointer, ValueHandle Hash,
  29     bool Abort) {
  30   if (checkDynamicType((void*)Pointer, Data->TypeInfo, Hash))
  31     // Just a cache miss. The type matches after all.
  32     return;
  33
  34   SourceLocation Loc = Data->Loc.acquire();
  35   if (Loc.isDisabled())
  36     return;
  37
  38   Diag(Loc, DL_Error,
  39        "%0 address %1 which does not point to an object of type %2")
  40     << TypeCheckKinds[Data->TypeCheckKind] << (void*)Pointer << Data->Type;
  41
  42   // If possible, say what type it actually points to.
  43   DynamicTypeInfo DTI = getDynamicTypeInfo((void*)Pointer);
  44   if (!DTI.isValid())
  45     Diag(Pointer, DL_Note, "object has invalid vptr")
  46       << MangledName(DTI.getMostDerivedTypeName())
  47       << Range(Pointer, Pointer + sizeof(uptr), "invalid vptr");
  48   else if (!DTI.getOffset())
  49     Diag(Pointer, DL_Note, "object is of type %0")
  50       << MangledName(DTI.getMostDerivedTypeName())
  51       << Range(Pointer, Pointer + sizeof(uptr), "vptr for %0");
  52   else
  53     // FIXME: Find the type at the specified offset, and include that
  54     //        in the note.
  55     Diag(Pointer - DTI.getOffset(), DL_Note,
  56          "object is base class subobject at offset %0 within object of type %1")
  57       << DTI.getOffset() << MangledName(DTI.getMostDerivedTypeName())
  58       << MangledName(DTI.getSubobjectTypeName())
  59       << Range(Pointer, Pointer + sizeof(uptr), "vptr for %2 base class of %1");
  60
  61   if (Abort)
  62     Die();
  63 }
  64
  65 void __ubsan::__ubsan_handle_dynamic_type_cache_miss(
  66     DynamicTypeCacheMissData *Data, ValueHandle Pointer, ValueHandle Hash) {
  67   HandleDynamicTypeCacheMiss(Data, Pointer, Hash, false);
  68 }
  69 void __ubsan::__ubsan_handle_dynamic_type_cache_miss_abort(
  70     DynamicTypeCacheMissData *Data, ValueHandle Pointer, ValueHandle Hash) {
  71   HandleDynamicTypeCacheMiss(Data, Pointer, Hash, true);
  72 }