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