| //===-- ubsan_handlers.cc -------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // Error logging entry points for the UBSan runtime. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "ubsan_handlers.h" |
| #include "ubsan_diag.h" |
| |
| #include "sanitizer_common/sanitizer_common.h" |
| |
| using namespace __sanitizer; |
| using namespace __ubsan; |
| |
| namespace __ubsan { |
| const char *TypeCheckKinds[] = { |
| "load of", "store to", "reference binding to", "member access within", |
| "member call on", "constructor call on", "downcast of", "downcast of" |
| }; |
| } |
| |
| static void handleTypeMismatchImpl(TypeMismatchData *Data, ValueHandle Pointer, |
| Location FallbackLoc) { |
| Location Loc = Data->Loc.acquire(); |
| |
| // Use the SourceLocation from Data to track deduplication, even if 'invalid' |
| if (Loc.getSourceLocation().isDisabled()) |
| return; |
| if (Data->Loc.isInvalid()) |
| Loc = FallbackLoc; |
| |
| if (!Pointer) |
| Diag(Loc, DL_Error, "%0 null pointer of type %1") |
| << TypeCheckKinds[Data->TypeCheckKind] << Data->Type; |
| else if (Data->Alignment && (Pointer & (Data->Alignment - 1))) |
| Diag(Loc, DL_Error, "%0 misaligned address %1 for type %3, " |
| "which requires %2 byte alignment") |
| << TypeCheckKinds[Data->TypeCheckKind] << (void*)Pointer |
| << Data->Alignment << Data->Type; |
| else |
| Diag(Loc, DL_Error, "%0 address %1 with insufficient space " |
| "for an object of type %2") |
| << TypeCheckKinds[Data->TypeCheckKind] << (void*)Pointer << Data->Type; |
| if (Pointer) |
| Diag(Pointer, DL_Note, "pointer points here"); |
| } |
| void __ubsan::__ubsan_handle_type_mismatch(TypeMismatchData *Data, |
| ValueHandle Pointer) { |
| handleTypeMismatchImpl(Data, Pointer, getCallerLocation()); |
| } |
| void __ubsan::__ubsan_handle_type_mismatch_abort(TypeMismatchData *Data, |
| ValueHandle Pointer) { |
| handleTypeMismatchImpl(Data, Pointer, getCallerLocation()); |
| Die(); |
| } |
| |
| /// \brief Common diagnostic emission for various forms of integer overflow. |
| template<typename T> static void HandleIntegerOverflow(OverflowData *Data, |
| ValueHandle LHS, |
| const char *Operator, |
| T RHS) { |
| SourceLocation Loc = Data->Loc.acquire(); |
| if (Loc.isDisabled()) |
| return; |
| |
| Diag(Loc, DL_Error, "%0 integer overflow: " |
| "%1 %2 %3 cannot be represented in type %4") |
| << (Data->Type.isSignedIntegerTy() ? "signed" : "unsigned") |
| << Value(Data->Type, LHS) << Operator << RHS << Data->Type; |
| } |
| |
| void __ubsan::__ubsan_handle_add_overflow(OverflowData *Data, |
| ValueHandle LHS, ValueHandle RHS) { |
| HandleIntegerOverflow(Data, LHS, "+", Value(Data->Type, RHS)); |
| } |
| void __ubsan::__ubsan_handle_add_overflow_abort(OverflowData *Data, |
| ValueHandle LHS, |
| ValueHandle RHS) { |
| __ubsan_handle_add_overflow(Data, LHS, RHS); |
| Die(); |
| } |
| |
| void __ubsan::__ubsan_handle_sub_overflow(OverflowData *Data, |
| ValueHandle LHS, ValueHandle RHS) { |
| HandleIntegerOverflow(Data, LHS, "-", Value(Data->Type, RHS)); |
| } |
| void __ubsan::__ubsan_handle_sub_overflow_abort(OverflowData *Data, |
| ValueHandle LHS, |
| ValueHandle RHS) { |
| __ubsan_handle_sub_overflow(Data, LHS, RHS); |
| Die(); |
| } |
| |
| void __ubsan::__ubsan_handle_mul_overflow(OverflowData *Data, |
| ValueHandle LHS, ValueHandle RHS) { |
| HandleIntegerOverflow(Data, LHS, "*", Value(Data->Type, RHS)); |
| } |
| void __ubsan::__ubsan_handle_mul_overflow_abort(OverflowData *Data, |
| ValueHandle LHS, |
| ValueHandle RHS) { |
| __ubsan_handle_mul_overflow(Data, LHS, RHS); |
| Die(); |
| } |
| |
| void __ubsan::__ubsan_handle_negate_overflow(OverflowData *Data, |
| ValueHandle OldVal) { |
| SourceLocation Loc = Data->Loc.acquire(); |
| if (Loc.isDisabled()) |
| return; |
| |
| if (Data->Type.isSignedIntegerTy()) |
| Diag(Loc, DL_Error, |
| "negation of %0 cannot be represented in type %1; " |
| "cast to an unsigned type to negate this value to itself") |
| << Value(Data->Type, OldVal) << Data->Type; |
| else |
| Diag(Loc, DL_Error, |
| "negation of %0 cannot be represented in type %1") |
| << Value(Data->Type, OldVal) << Data->Type; |
| } |
| void __ubsan::__ubsan_handle_negate_overflow_abort(OverflowData *Data, |
| ValueHandle OldVal) { |
| __ubsan_handle_negate_overflow(Data, OldVal); |
| Die(); |
| } |
| |
| void __ubsan::__ubsan_handle_divrem_overflow(OverflowData *Data, |
| ValueHandle LHS, ValueHandle RHS) { |
| SourceLocation Loc = Data->Loc.acquire(); |
| if (Loc.isDisabled()) |
| return; |
| |
| Value LHSVal(Data->Type, LHS); |
| Value RHSVal(Data->Type, RHS); |
| if (RHSVal.isMinusOne()) |
| Diag(Loc, DL_Error, |
| "division of %0 by -1 cannot be represented in type %1") |
| << LHSVal << Data->Type; |
| else |
| Diag(Loc, DL_Error, "division by zero"); |
| } |
| void __ubsan::__ubsan_handle_divrem_overflow_abort(OverflowData *Data, |
| ValueHandle LHS, |
| ValueHandle RHS) { |
| __ubsan_handle_divrem_overflow(Data, LHS, RHS); |
| Die(); |
| } |
| |
| void __ubsan::__ubsan_handle_shift_out_of_bounds(ShiftOutOfBoundsData *Data, |
| ValueHandle LHS, |
| ValueHandle RHS) { |
| SourceLocation Loc = Data->Loc.acquire(); |
| if (Loc.isDisabled()) |
| return; |
| |
| Value LHSVal(Data->LHSType, LHS); |
| Value RHSVal(Data->RHSType, RHS); |
| if (RHSVal.isNegative()) |
| Diag(Loc, DL_Error, "shift exponent %0 is negative") << RHSVal; |
| else if (RHSVal.getPositiveIntValue() >= Data->LHSType.getIntegerBitWidth()) |
| Diag(Loc, DL_Error, |
| "shift exponent %0 is too large for %1-bit type %2") |
| << RHSVal << Data->LHSType.getIntegerBitWidth() << Data->LHSType; |
| else if (LHSVal.isNegative()) |
| Diag(Loc, DL_Error, "left shift of negative value %0") << LHSVal; |
| else |
| Diag(Loc, DL_Error, |
| "left shift of %0 by %1 places cannot be represented in type %2") |
| << LHSVal << RHSVal << Data->LHSType; |
| } |
| void __ubsan::__ubsan_handle_shift_out_of_bounds_abort( |
| ShiftOutOfBoundsData *Data, |
| ValueHandle LHS, |
| ValueHandle RHS) { |
| __ubsan_handle_shift_out_of_bounds(Data, LHS, RHS); |
| Die(); |
| } |
| |
| void __ubsan::__ubsan_handle_out_of_bounds(OutOfBoundsData *Data, |
| ValueHandle Index) { |
| SourceLocation Loc = Data->Loc.acquire(); |
| if (Loc.isDisabled()) |
| return; |
| |
| Value IndexVal(Data->IndexType, Index); |
| Diag(Loc, DL_Error, "index %0 out of bounds for type %1") |
| << IndexVal << Data->ArrayType; |
| } |
| void __ubsan::__ubsan_handle_out_of_bounds_abort(OutOfBoundsData *Data, |
| ValueHandle Index) { |
| __ubsan_handle_out_of_bounds(Data, Index); |
| Die(); |
| } |
| |
| void __ubsan::__ubsan_handle_builtin_unreachable(UnreachableData *Data) { |
| Diag(Data->Loc, DL_Error, "execution reached a __builtin_unreachable() call"); |
| Die(); |
| } |
| |
| void __ubsan::__ubsan_handle_missing_return(UnreachableData *Data) { |
| Diag(Data->Loc, DL_Error, |
| "execution reached the end of a value-returning function " |
| "without returning a value"); |
| Die(); |
| } |
| |
| void __ubsan::__ubsan_handle_vla_bound_not_positive(VLABoundData *Data, |
| ValueHandle Bound) { |
| SourceLocation Loc = Data->Loc.acquire(); |
| if (Loc.isDisabled()) |
| return; |
| |
| Diag(Loc, DL_Error, "variable length array bound evaluates to " |
| "non-positive value %0") |
| << Value(Data->Type, Bound); |
| } |
| void __ubsan::__ubsan_handle_vla_bound_not_positive_abort(VLABoundData *Data, |
| ValueHandle Bound) { |
| __ubsan_handle_vla_bound_not_positive(Data, Bound); |
| Die(); |
| } |
| |
| |
| void __ubsan::__ubsan_handle_float_cast_overflow(FloatCastOverflowData *Data, |
| ValueHandle From) { |
| // TODO: Add deduplication once a SourceLocation is generated for this check. |
| Diag(getCallerLocation(), DL_Error, |
| "value %0 is outside the range of representable values of type %2") |
| << Value(Data->FromType, From) << Data->FromType << Data->ToType; |
| } |
| void __ubsan::__ubsan_handle_float_cast_overflow_abort( |
| FloatCastOverflowData *Data, |
| ValueHandle From) { |
| Diag(getCallerLocation(), DL_Error, |
| "value %0 is outside the range of representable values of type %2") |
| << Value(Data->FromType, From) << Data->FromType << Data->ToType; |
| Die(); |
| } |
| |
| void __ubsan::__ubsan_handle_load_invalid_value(InvalidValueData *Data, |
| ValueHandle Val) { |
| // TODO: Add deduplication once a SourceLocation is generated for this check. |
| Diag(getCallerLocation(), DL_Error, |
| "load of value %0, which is not a valid value for type %1") |
| << Value(Data->Type, Val) << Data->Type; |
| } |
| void __ubsan::__ubsan_handle_load_invalid_value_abort(InvalidValueData *Data, |
| ValueHandle Val) { |
| Diag(getCallerLocation(), DL_Error, |
| "load of value %0, which is not a valid value for type %1") |
| << Value(Data->Type, Val) << Data->Type; |
| Die(); |
| } |
