ubsan_handlers_cxx.cc revision 2af552f98f980178db37eed28a609b6bf55f6df8 
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
22using namespace __sanitizer;
23using namespace __ubsan;
24
25namespace __ubsan {
26  extern const char *TypeCheckKinds[];
27}
28
29static 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  // FIXME: Demangle the type names.
46  DynamicTypeInfo DTI = getDynamicTypeInfo((void*)Pointer);
47  if (!DTI.isValid())
48    Diag(Pointer, DL_Note, "object has invalid vptr")
49      << MangledName(DTI.getMostDerivedTypeName())
50      << Range(Pointer, Pointer + sizeof(uptr), "invalid vptr");
51  else if (!DTI.getOffset())
52    Diag(Pointer, DL_Note, "object is of type %0")
53      << MangledName(DTI.getMostDerivedTypeName())
54      << Range(Pointer, Pointer + sizeof(uptr), "vptr for %0");
55  else
56    // FIXME: Find the type at the specified offset, and include that
57    //        in the note.
58    Diag(Pointer - DTI.getOffset(), DL_Note,
59         "object is base class subobject at offset %0 within object of type %1")
60      << DTI.getOffset() << MangledName(DTI.getMostDerivedTypeName())
61      << MangledName(DTI.getSubobjectTypeName())
62      << Range(Pointer, Pointer + sizeof(uptr), "vptr for %2 base class of %1");
63
64  if (Abort)
65    Die();
66}
67
68void __ubsan::__ubsan_handle_dynamic_type_cache_miss(
69    DynamicTypeCacheMissData *Data, ValueHandle Pointer, ValueHandle Hash) {
70  HandleDynamicTypeCacheMiss(Data, Pointer, Hash, false);
71}
72void __ubsan::__ubsan_handle_dynamic_type_cache_miss_abort(
73    DynamicTypeCacheMissData *Data, ValueHandle Pointer, ValueHandle Hash) {
74  HandleDynamicTypeCacheMiss(Data, Pointer, Hash, true);
75}
76