lib/ubsan/ubsan_handlers_cxx.cc

   1 //===-- ubsan_handlers_cxx.cc ---------------------------------------------===//
   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 // Error logging entry points for the UBSan runtime, which are only used for C++
  11 // compilations. This file is permitted to use language features which require
  12 // linking against a C++ ABI library.
  13 //
  14 //===----------------------------------------------------------------------===//
  15
  16 #include "ubsan_handlers_cxx.h"
  17 #include "ubsan_diag.h"
  18 #include "ubsan_type_hash.h"
  19
  20 #include "sanitizer_common/sanitizer_common.h"
  21
  22 using namespace __sanitizer;
  23 using namespace __ubsan;
  24
  25 namespace __ubsan {
  26   extern const char *TypeCheckKinds[];
  27 }
  28
  29 static void HandleDynamicTypeCacheMiss(
  30     DynamicTypeCacheMissData *Data, ValueHandle Pointer, ValueHandle Hash,
  31     bool Abort) {
  32   if (checkDynamicType((void*)Pointer, Data->TypeInfo, Hash))
  33     // Just a cache miss. The type matches after all.
  34     return;
  35
  36   SourceLocation Loc = Data->Loc.acquire();
  37   if (Loc.isDisabled())
  38     return;
  39
  40   Diag(Loc, DL_Error,
  41        "%0 address %1 which does not point to an object of type %2")
  42     << TypeCheckKinds[Data->TypeCheckKind] << (void*)Pointer << Data->Type;
  43
  44   // If possible, say what type it actually points to.
  45   DynamicTypeInfo DTI = getDynamicTypeInfo((void*)Pointer);
  46   if (!DTI.isValid())
  47     Diag(Pointer, DL_Note, "object has invalid vptr")
  48       << MangledName(DTI.getMostDerivedTypeName())
  49       << Range(Pointer, Pointer + sizeof(uptr), "invalid vptr");
  50   else if (!DTI.getOffset())
  51     Diag(Pointer, DL_Note, "object is of type %0")
  52       << MangledName(DTI.getMostDerivedTypeName())
  53       << Range(Pointer, Pointer + sizeof(uptr), "vptr for %0");
  54   else
  55     // FIXME: Find the type at the specified offset, and include that
  56     //        in the note.
  57     Diag(Pointer - DTI.getOffset(), DL_Note,
  58          "object is base class subobject at offset %0 within object of type %1")
  59       << DTI.getOffset() << MangledName(DTI.getMostDerivedTypeName())
  60       << MangledName(DTI.getSubobjectTypeName())
  61       << Range(Pointer, Pointer + sizeof(uptr), "vptr for %2 base class of %1");
  62
  63   MAYBE_PRINT_STACK_TRACE();
  64   if (Abort)
  65     Die();
  66 }
  67
  68 void __ubsan::__ubsan_handle_dynamic_type_cache_miss(
  69     DynamicTypeCacheMissData *Data, ValueHandle Pointer, ValueHandle Hash) {
  70   HandleDynamicTypeCacheMiss(Data, Pointer, Hash, false);
  71 }
  72 void __ubsan::__ubsan_handle_dynamic_type_cache_miss_abort(
  73     DynamicTypeCacheMissData *Data, ValueHandle Pointer, ValueHandle Hash) {
  74   HandleDynamicTypeCacheMiss(Data, Pointer, Hash, true);
  75 }