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 #include "sanitizer_common/sanitizer_suppressions.h"
  20
  21 using namespace __sanitizer;
  22 using namespace __ubsan;
  23
  24 namespace __ubsan {
  25   extern const char *TypeCheckKinds[];
  26 }
  27
  28 static void HandleDynamicTypeCacheMiss(
  29     DynamicTypeCacheMissData *Data, ValueHandle Pointer, ValueHandle Hash,
  30     ReportOptions Opts) {
  31   if (checkDynamicType((void*)Pointer, Data->TypeInfo, Hash))
  32     // Just a cache miss. The type matches after all.
  33     return;
  34
  35   // Check if error report should be suppressed.
  36   DynamicTypeInfo DTI = getDynamicTypeInfo((void*)Pointer);
  37   if (DTI.isValid() &&
  38       MatchSuppression(DTI.getMostDerivedTypeName(), SuppressionVptrCheck))
  39     return;
  40
  41   SourceLocation Loc = Data->Loc.acquire();
  42   if (Loc.isDisabled())
  43     return;
  44
  45   ScopedReport R(Opts, Loc);
  46
  47   Diag(Loc, DL_Error,
  48        "%0 address %1 which does not point to an object of type %2")
  49     << TypeCheckKinds[Data->TypeCheckKind] << (void*)Pointer << Data->Type;
  50
  51   // If possible, say what type it actually points to.
  52   if (!DTI.isValid())
  53     Diag(Pointer, DL_Note, "object has invalid vptr")
  54         << MangledName(DTI.getMostDerivedTypeName())
  55         << Range(Pointer, Pointer + sizeof(uptr), "invalid vptr");
  56   else if (!DTI.getOffset())
  57     Diag(Pointer, DL_Note, "object is of type %0")
  58         << MangledName(DTI.getMostDerivedTypeName())
  59         << Range(Pointer, Pointer + sizeof(uptr), "vptr for %0");
  60   else
  61     // FIXME: Find the type at the specified offset, and include that
  62     //        in the note.
  63     Diag(Pointer - DTI.getOffset(), DL_Note,
  64          "object is base class subobject at offset %0 within object of type %1")
  65         << DTI.getOffset() << MangledName(DTI.getMostDerivedTypeName())
  66         << MangledName(DTI.getSubobjectTypeName())
  67         << Range(Pointer, Pointer + sizeof(uptr),
  68                  "vptr for %2 base class of %1");
  69 }
  70
  71 void __ubsan::__ubsan_handle_dynamic_type_cache_miss(
  72     DynamicTypeCacheMissData *Data, ValueHandle Pointer, ValueHandle Hash) {
  73   GET_REPORT_OPTIONS(false);
  74   HandleDynamicTypeCacheMiss(Data, Pointer, Hash, Opts);
  75 }
  76 void __ubsan::__ubsan_handle_dynamic_type_cache_miss_abort(
  77     DynamicTypeCacheMissData *Data, ValueHandle Pointer, ValueHandle Hash) {
  78   GET_REPORT_OPTIONS(true);
  79   HandleDynamicTypeCacheMiss(Data, Pointer, Hash, Opts);
  80 }