ubsan_handlers_cxx.cc revision 45a8124a70fa720756c4c40d741b588172879bb7 
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  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  if (Abort)
64    Die();
65}
66
67void __ubsan::__ubsan_handle_dynamic_type_cache_miss(
68    DynamicTypeCacheMissData *Data, ValueHandle Pointer, ValueHandle Hash) {
69  HandleDynamicTypeCacheMiss(Data, Pointer, Hash, false);
70}
71void __ubsan::__ubsan_handle_dynamic_type_cache_miss_abort(
72    DynamicTypeCacheMissData *Data, ValueHandle Pointer, ValueHandle Hash) {
73  HandleDynamicTypeCacheMiss(Data, Pointer, Hash, true);
74}
75