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//===-- 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();
}
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