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