src/compiler-rt/lib/ubsan/ubsan_handlers.h

   1 //===-- ubsan_handlers.h ----------------------------------------*- C++ -*-===//
   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 // Entry points to the runtime library for Clang's undefined behavior sanitizer.
  11 //
  12 //===----------------------------------------------------------------------===//
  13 #ifndef UBSAN_HANDLERS_H
  14 #define UBSAN_HANDLERS_H
  15
  16 #include "ubsan_value.h"
  17
  18 namespace __ubsan {
  19
  20 struct TypeMismatchData {
  21   SourceLocation Loc;
  22   const TypeDescriptor &Type;
  23   unsigned char LogAlignment;
  24   unsigned char TypeCheckKind;
  25 };
  26
  27 #define UNRECOVERABLE(checkname, ...) \
  28   extern "C" SANITIZER_INTERFACE_ATTRIBUTE NORETURN \
  29     void __ubsan_handle_ ## checkname( __VA_ARGS__ );
  30
  31 #define RECOVERABLE(checkname, ...) \
  32   extern "C" SANITIZER_INTERFACE_ATTRIBUTE \
  33     void __ubsan_handle_ ## checkname( __VA_ARGS__ ); \
  34   extern "C" SANITIZER_INTERFACE_ATTRIBUTE NORETURN \
  35     void __ubsan_handle_ ## checkname ## _abort( __VA_ARGS__ );
  36
  37 /// \brief Handle a runtime type check failure, caused by either a misaligned
  38 /// pointer, a null pointer, or a pointer to insufficient storage for the
  39 /// type.
  40 RECOVERABLE(type_mismatch_v1, TypeMismatchData *Data, ValueHandle Pointer)
  41
  42 struct OverflowData {
  43   SourceLocation Loc;
  44   const TypeDescriptor &Type;
  45 };
  46
  47 /// \brief Handle an integer addition overflow.
  48 RECOVERABLE(add_overflow, OverflowData *Data, ValueHandle LHS, ValueHandle RHS)
  49
  50 /// \brief Handle an integer subtraction overflow.
  51 RECOVERABLE(sub_overflow, OverflowData *Data, ValueHandle LHS, ValueHandle RHS)
  52
  53 /// \brief Handle an integer multiplication overflow.
  54 RECOVERABLE(mul_overflow, OverflowData *Data, ValueHandle LHS, ValueHandle RHS)
  55
  56 /// \brief Handle a signed integer overflow for a unary negate operator.
  57 RECOVERABLE(negate_overflow, OverflowData *Data, ValueHandle OldVal)
  58
  59 /// \brief Handle an INT_MIN/-1 overflow or division by zero.
  60 RECOVERABLE(divrem_overflow, OverflowData *Data,
  61             ValueHandle LHS, ValueHandle RHS)
  62
  63 struct ShiftOutOfBoundsData {
  64   SourceLocation Loc;
  65   const TypeDescriptor &LHSType;
  66   const TypeDescriptor &RHSType;
  67 };
  68
  69 /// \brief Handle a shift where the RHS is out of bounds or a left shift where
  70 /// the LHS is negative or overflows.
  71 RECOVERABLE(shift_out_of_bounds, ShiftOutOfBoundsData *Data,
  72             ValueHandle LHS, ValueHandle RHS)
  73
  74 struct OutOfBoundsData {
  75   SourceLocation Loc;
  76   const TypeDescriptor &ArrayType;
  77   const TypeDescriptor &IndexType;
  78 };
  79
  80 /// \brief Handle an array index out of bounds error.
  81 RECOVERABLE(out_of_bounds, OutOfBoundsData *Data, ValueHandle Index)
  82
  83 struct UnreachableData {
  84   SourceLocation Loc;
  85 };
  86
  87 /// \brief Handle a __builtin_unreachable which is reached.
  88 UNRECOVERABLE(builtin_unreachable, UnreachableData *Data)
  89 /// \brief Handle reaching the end of a value-returning function.
  90 UNRECOVERABLE(missing_return, UnreachableData *Data)
  91
  92 struct VLABoundData {
  93   SourceLocation Loc;
  94   const TypeDescriptor &Type;
  95 };
  96
  97 /// \brief Handle a VLA with a non-positive bound.
  98 RECOVERABLE(vla_bound_not_positive, VLABoundData *Data, ValueHandle Bound)
  99
 100 // Keeping this around for binary compatibility with (sanitized) programs
 101 // compiled with older compilers.
 102 struct FloatCastOverflowData {
 103   const TypeDescriptor &FromType;
 104   const TypeDescriptor &ToType;
 105 };
 106
 107 struct FloatCastOverflowDataV2 {
 108   SourceLocation Loc;
 109   const TypeDescriptor &FromType;
 110   const TypeDescriptor &ToType;
 111 };
 112
 113 /// Handle overflow in a conversion to or from a floating-point type.
 114 /// void *Data is one of FloatCastOverflowData* or FloatCastOverflowDataV2*
 115 RECOVERABLE(float_cast_overflow, void *Data, ValueHandle From)
 116
 117 struct InvalidValueData {
 118   SourceLocation Loc;
 119   const TypeDescriptor &Type;
 120 };
 121
 122 /// \brief Handle a load of an invalid value for the type.
 123 RECOVERABLE(load_invalid_value, InvalidValueData *Data, ValueHandle Val)
 124
 125 struct FunctionTypeMismatchData {
 126   SourceLocation Loc;
 127   const TypeDescriptor &Type;
 128 };
 129
 130 RECOVERABLE(function_type_mismatch,
 131             FunctionTypeMismatchData *Data,
 132             ValueHandle Val)
 133
 134 struct NonNullReturnData {
 135   SourceLocation Loc;
 136   SourceLocation AttrLoc;
 137 };
 138
 139 /// \brief Handle returning null from function with returns_nonnull attribute.
 140 RECOVERABLE(nonnull_return, NonNullReturnData *Data)
 141
 142 struct NonNullArgData {
 143   SourceLocation Loc;
 144   SourceLocation AttrLoc;
 145   int ArgIndex;
 146 };
 147
 148 /// \brief Handle passing null pointer to function with nonnull attribute.
 149 RECOVERABLE(nonnull_arg, NonNullArgData *Data)
 150
 151 /// \brief Known CFI check kinds.
 152 /// Keep in sync with the enum of the same name in CodeGenFunction.h
 153 enum CFITypeCheckKind : unsigned char {
 154   CFITCK_VCall,
 155   CFITCK_NVCall,
 156   CFITCK_DerivedCast,
 157   CFITCK_UnrelatedCast,
 158   CFITCK_ICall,
 159 };
 160
 161 struct CFICheckFailData {
 162   CFITypeCheckKind CheckKind;
 163   SourceLocation Loc;
 164   const TypeDescriptor &Type;
 165 };
 166
 167 /// \brief Handle control flow integrity failures.
 168 RECOVERABLE(cfi_check_fail, CFICheckFailData *Data, ValueHandle Function,
 169             uptr VtableIsValid)
 170 }
 171
 172 #endif // UBSAN_HANDLERS_H