Libsanitizer merge from trunk r368656.

2019-08-14  Martin Liska  <mliska@suse.cz>

	PR sanitizer/89832
	PR sanitizer/91325
	* All source files: Merge from upstream 368656.

From-SVN: r274426

1 files changed, 824 insertions, 0 deletions

diff --git a/libsanitizer/ubsan/ubsan_handlers.cpp b/libsanitizer/ubsan/ubsan_handlers.cpp
new file mode 100644
index 0000000..e832581
--- /dev/null
+++ b/libsanitizer/ubsan/ubsan_handlers.cpp
@@ -0,0 +1,824 @@
+//===-- ubsan_handlers.cpp ------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Error logging entry points for the UBSan runtime.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ubsan_platform.h"
+#if CAN_SANITIZE_UB
+#include "ubsan_handlers.h"
+#include "ubsan_diag.h"
+#include "ubsan_flags.h"
+#include "ubsan_monitor.h"
+
+#include "sanitizer_common/sanitizer_common.h"
+
+using namespace __sanitizer;
+using namespace __ubsan;
+
+namespace __ubsan {
+bool ignoreReport(SourceLocation SLoc, ReportOptions Opts, ErrorType ET) {
+  // We are not allowed to skip error report: if we are in unrecoverable
+  // handler, we have to terminate the program right now, and therefore
+  // have to print some diagnostic.
+  //
+  // Even if source location is disabled, it doesn't mean that we have
+  // already report an error to the user: some concurrently running
+  // thread could have acquired it, but not yet printed the report.
+  if (Opts.FromUnrecoverableHandler)
+    return false;
+  return SLoc.isDisabled() || IsPCSuppressed(ET, Opts.pc, SLoc.getFilename());
+}
+
+const char *TypeCheckKinds[] = {
+    "load of", "store to", "reference binding to", "member access within",
+    "member call on", "constructor call on", "downcast of", "downcast of",
+    "upcast of", "cast to virtual base of", "_Nonnull binding to",
+    "dynamic operation on"};
+}
+
+static void handleTypeMismatchImpl(TypeMismatchData *Data, ValueHandle Pointer,
+                                   ReportOptions Opts) {
+  Location Loc = Data->Loc.acquire();
+
+  uptr Alignment = (uptr)1 << Data->LogAlignment;
+  ErrorType ET;
+  if (!Pointer)
+    ET = ErrorType::NullPointerUse;
+  else if (Pointer & (Alignment - 1))
+    ET = ErrorType::MisalignedPointerUse;
+  else
+    ET = ErrorType::InsufficientObjectSize;
+
+  // Use the SourceLocation from Data to track deduplication, even if it's
+  // invalid.
+  if (ignoreReport(Loc.getSourceLocation(), Opts, ET))
+    return;
+
+  SymbolizedStackHolder FallbackLoc;
+  if (Data->Loc.isInvalid()) {
+    FallbackLoc.reset(getCallerLocation(Opts.pc));
+    Loc = FallbackLoc;
+  }
+
+  ScopedReport R(Opts, Loc, ET);
+
+  switch (ET) {
+  case ErrorType::NullPointerUse:
+    Diag(Loc, DL_Error, ET, "%0 null pointer of type %1")
+        << TypeCheckKinds[Data->TypeCheckKind] << Data->Type;
+    break;
+  case ErrorType::MisalignedPointerUse:
+    Diag(Loc, DL_Error, ET, "%0 misaligned address %1 for type %3, "
+                        "which requires %2 byte alignment")
+        << TypeCheckKinds[Data->TypeCheckKind] << (void *)Pointer << Alignment
+        << Data->Type;
+    break;
+  case ErrorType::InsufficientObjectSize:
+    Diag(Loc, DL_Error, ET, "%0 address %1 with insufficient space "
+                        "for an object of type %2")
+        << TypeCheckKinds[Data->TypeCheckKind] << (void *)Pointer << Data->Type;
+    break;
+  default:
+    UNREACHABLE("unexpected error type!");
+  }
+
+  if (Pointer)
+    Diag(Pointer, DL_Note, ET, "pointer points here");
+}
+
+void __ubsan::__ubsan_handle_type_mismatch_v1(TypeMismatchData *Data,
+                                              ValueHandle Pointer) {
+  GET_REPORT_OPTIONS(false);
+  handleTypeMismatchImpl(Data, Pointer, Opts);
+}
+void __ubsan::__ubsan_handle_type_mismatch_v1_abort(TypeMismatchData *Data,
+                                                    ValueHandle Pointer) {
+  GET_REPORT_OPTIONS(true);
+  handleTypeMismatchImpl(Data, Pointer, Opts);
+  Die();
+}
+
+static void handleAlignmentAssumptionImpl(AlignmentAssumptionData *Data,
+                                          ValueHandle Pointer,
+                                          ValueHandle Alignment,
+                                          ValueHandle Offset,
+                                          ReportOptions Opts) {
+  Location Loc = Data->Loc.acquire();
+  SourceLocation AssumptionLoc = Data->AssumptionLoc.acquire();
+
+  ErrorType ET = ErrorType::AlignmentAssumption;
+
+  if (ignoreReport(Loc.getSourceLocation(), Opts, ET))
+    return;
+
+  ScopedReport R(Opts, Loc, ET);
+
+  uptr RealPointer = Pointer - Offset;
+  uptr LSB = LeastSignificantSetBitIndex(RealPointer);
+  uptr ActualAlignment = uptr(1) << LSB;
+
+  uptr Mask = Alignment - 1;
+  uptr MisAlignmentOffset = RealPointer & Mask;
+
+  if (!Offset) {
+    Diag(Loc, DL_Error, ET,
+         "assumption of %0 byte alignment for pointer of type %1 failed")
+        << Alignment << Data->Type;
+  } else {
+    Diag(Loc, DL_Error, ET,
+         "assumption of %0 byte alignment (with offset of %1 byte) for pointer "
+         "of type %2 failed")
+        << Alignment << Offset << Data->Type;
+  }
+
+  if (!AssumptionLoc.isInvalid())
+    Diag(AssumptionLoc, DL_Note, ET, "alignment assumption was specified here");
+
+  Diag(RealPointer, DL_Note, ET,
+       "%0address is %1 aligned, misalignment offset is %2 bytes")
+      << (Offset ? "offset " : "") << ActualAlignment << MisAlignmentOffset;
+}
+
+void __ubsan::__ubsan_handle_alignment_assumption(AlignmentAssumptionData *Data,
+                                                  ValueHandle Pointer,
+                                                  ValueHandle Alignment,
+                                                  ValueHandle Offset) {
+  GET_REPORT_OPTIONS(false);
+  handleAlignmentAssumptionImpl(Data, Pointer, Alignment, Offset, Opts);
+}
+void __ubsan::__ubsan_handle_alignment_assumption_abort(
+    AlignmentAssumptionData *Data, ValueHandle Pointer, ValueHandle Alignment,
+    ValueHandle Offset) {
+  GET_REPORT_OPTIONS(true);
+  handleAlignmentAssumptionImpl(Data, Pointer, Alignment, Offset, Opts);
+  Die();
+}
+
+/// \brief Common diagnostic emission for various forms of integer overflow.
+template <typename T>
+static void handleIntegerOverflowImpl(OverflowData *Data, ValueHandle LHS,
+                                      const char *Operator, T RHS,
+                                      ReportOptions Opts) {
+  SourceLocation Loc = Data->Loc.acquire();
+  bool IsSigned = Data->Type.isSignedIntegerTy();
+  ErrorType ET = IsSigned ? ErrorType::SignedIntegerOverflow
+                          : ErrorType::UnsignedIntegerOverflow;
+
+  if (ignoreReport(Loc, Opts, ET))
+    return;
+
+  // If this is an unsigned overflow in non-fatal mode, potentially ignore it.
+  if (!IsSigned && !Opts.FromUnrecoverableHandler &&
+      flags()->silence_unsigned_overflow)
+    return;
+
+  ScopedReport R(Opts, Loc, ET);
+
+  Diag(Loc, DL_Error, ET, "%0 integer overflow: "
+                          "%1 %2 %3 cannot be represented in type %4")
+      << (IsSigned ? "signed" : "unsigned") << Value(Data->Type, LHS)
+      << Operator << RHS << Data->Type;
+}
+
+#define UBSAN_OVERFLOW_HANDLER(handler_name, op, unrecoverable)                \
+  void __ubsan::handler_name(OverflowData *Data, ValueHandle LHS,              \
+                             ValueHandle RHS) {                                \
+    GET_REPORT_OPTIONS(unrecoverable);                                         \
+    handleIntegerOverflowImpl(Data, LHS, op, Value(Data->Type, RHS), Opts);    \
+    if (unrecoverable)                                                         \
+      Die();                                                                   \
+  }
+
+UBSAN_OVERFLOW_HANDLER(__ubsan_handle_add_overflow, "+", false)
+UBSAN_OVERFLOW_HANDLER(__ubsan_handle_add_overflow_abort, "+", true)
+UBSAN_OVERFLOW_HANDLER(__ubsan_handle_sub_overflow, "-", false)
+UBSAN_OVERFLOW_HANDLER(__ubsan_handle_sub_overflow_abort, "-", true)
+UBSAN_OVERFLOW_HANDLER(__ubsan_handle_mul_overflow, "*", false)
+UBSAN_OVERFLOW_HANDLER(__ubsan_handle_mul_overflow_abort, "*", true)
+
+static void handleNegateOverflowImpl(OverflowData *Data, ValueHandle OldVal,
+                                     ReportOptions Opts) {
+  SourceLocation Loc = Data->Loc.acquire();
+  bool IsSigned = Data->Type.isSignedIntegerTy();
+  ErrorType ET = IsSigned ? ErrorType::SignedIntegerOverflow
+                          : ErrorType::UnsignedIntegerOverflow;
+
+  if (ignoreReport(Loc, Opts, ET))
+    return;
+
+  if (!IsSigned && flags()->silence_unsigned_overflow)
+    return;
+
+  ScopedReport R(Opts, Loc, ET);
+
+  if (IsSigned)
+    Diag(Loc, DL_Error, ET,
+         "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, ET, "negation of %0 cannot be represented in type %1")
+        << Value(Data->Type, OldVal) << Data->Type;
+}
+
+void __ubsan::__ubsan_handle_negate_overflow(OverflowData *Data,
+                                             ValueHandle OldVal) {
+  GET_REPORT_OPTIONS(false);
+  handleNegateOverflowImpl(Data, OldVal, Opts);
+}
+void __ubsan::__ubsan_handle_negate_overflow_abort(OverflowData *Data,
+                                                    ValueHandle OldVal) {
+  GET_REPORT_OPTIONS(true);
+  handleNegateOverflowImpl(Data, OldVal, Opts);
+  Die();
+}
+
+static void handleDivremOverflowImpl(OverflowData *Data, ValueHandle LHS,
+                                     ValueHandle RHS, ReportOptions Opts) {
+  SourceLocation Loc = Data->Loc.acquire();
+  Value LHSVal(Data->Type, LHS);
+  Value RHSVal(Data->Type, RHS);
+
+  ErrorType ET;
+  if (RHSVal.isMinusOne())
+    ET = ErrorType::SignedIntegerOverflow;
+  else if (Data->Type.isIntegerTy())
+    ET = ErrorType::IntegerDivideByZero;
+  else
+    ET = ErrorType::FloatDivideByZero;
+
+  if (ignoreReport(Loc, Opts, ET))
+    return;
+
+  ScopedReport R(Opts, Loc, ET);
+
+  switch (ET) {
+  case ErrorType::SignedIntegerOverflow:
+    Diag(Loc, DL_Error, ET,
+         "division of %0 by -1 cannot be represented in type %1")
+        << LHSVal << Data->Type;
+    break;
+  default:
+    Diag(Loc, DL_Error, ET, "division by zero");
+    break;
+  }
+}
+
+void __ubsan::__ubsan_handle_divrem_overflow(OverflowData *Data,
+                                             ValueHandle LHS, ValueHandle RHS) {
+  GET_REPORT_OPTIONS(false);
+  handleDivremOverflowImpl(Data, LHS, RHS, Opts);
+}
+void __ubsan::__ubsan_handle_divrem_overflow_abort(OverflowData *Data,
+                                                    ValueHandle LHS,
+                                                    ValueHandle RHS) {
+  GET_REPORT_OPTIONS(true);
+  handleDivremOverflowImpl(Data, LHS, RHS, Opts);
+  Die();
+}
+
+static void handleShiftOutOfBoundsImpl(ShiftOutOfBoundsData *Data,
+                                       ValueHandle LHS, ValueHandle RHS,
+                                       ReportOptions Opts) {
+  SourceLocation Loc = Data->Loc.acquire();
+  Value LHSVal(Data->LHSType, LHS);
+  Value RHSVal(Data->RHSType, RHS);
+
+  ErrorType ET;
+  if (RHSVal.isNegative() ||
+      RHSVal.getPositiveIntValue() >= Data->LHSType.getIntegerBitWidth())
+    ET = ErrorType::InvalidShiftExponent;
+  else
+    ET = ErrorType::InvalidShiftBase;
+
+  if (ignoreReport(Loc, Opts, ET))
+    return;
+
+  ScopedReport R(Opts, Loc, ET);
+
+  if (ET == ErrorType::InvalidShiftExponent) {
+    if (RHSVal.isNegative())
+      Diag(Loc, DL_Error, ET, "shift exponent %0 is negative") << RHSVal;
+    else
+      Diag(Loc, DL_Error, ET,
+           "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, ET, "left shift of negative value %0") << LHSVal;
+    else
+      Diag(Loc, DL_Error, ET,
+           "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(ShiftOutOfBoundsData *Data,
+                                                 ValueHandle LHS,
+                                                 ValueHandle RHS) {
+  GET_REPORT_OPTIONS(false);
+  handleShiftOutOfBoundsImpl(Data, LHS, RHS, Opts);
+}
+void __ubsan::__ubsan_handle_shift_out_of_bounds_abort(
+                                                     ShiftOutOfBoundsData *Data,
+                                                     ValueHandle LHS,
+                                                     ValueHandle RHS) {
+  GET_REPORT_OPTIONS(true);
+  handleShiftOutOfBoundsImpl(Data, LHS, RHS, Opts);
+  Die();
+}
+
+static void handleOutOfBoundsImpl(OutOfBoundsData *Data, ValueHandle Index,
+                                  ReportOptions Opts) {
+  SourceLocation Loc = Data->Loc.acquire();
+  ErrorType ET = ErrorType::OutOfBoundsIndex;
+
+  if (ignoreReport(Loc, Opts, ET))
+    return;
+
+  ScopedReport R(Opts, Loc, ET);
+
+  Value IndexVal(Data->IndexType, Index);
+  Diag(Loc, DL_Error, ET, "index %0 out of bounds for type %1")
+    << IndexVal << Data->ArrayType;
+}
+
+void __ubsan::__ubsan_handle_out_of_bounds(OutOfBoundsData *Data,
+                                           ValueHandle Index) {
+  GET_REPORT_OPTIONS(false);
+  handleOutOfBoundsImpl(Data, Index, Opts);
+}
+void __ubsan::__ubsan_handle_out_of_bounds_abort(OutOfBoundsData *Data,
+                                                 ValueHandle Index) {
+  GET_REPORT_OPTIONS(true);
+  handleOutOfBoundsImpl(Data, Index, Opts);
+  Die();
+}
+
+static void handleBuiltinUnreachableImpl(UnreachableData *Data,
+                                         ReportOptions Opts) {
+  ErrorType ET = ErrorType::UnreachableCall;
+  ScopedReport R(Opts, Data->Loc, ET);
+  Diag(Data->Loc, DL_Error, ET,
+       "execution reached an unreachable program point");
+}
+
+void __ubsan::__ubsan_handle_builtin_unreachable(UnreachableData *Data) {
+  GET_REPORT_OPTIONS(true);
+  handleBuiltinUnreachableImpl(Data, Opts);
+  Die();
+}
+
+static void handleMissingReturnImpl(UnreachableData *Data, ReportOptions Opts) {
+  ErrorType ET = ErrorType::MissingReturn;
+  ScopedReport R(Opts, Data->Loc, ET);
+  Diag(Data->Loc, DL_Error, ET,
+       "execution reached the end of a value-returning function "
+       "without returning a value");
+}
+
+void __ubsan::__ubsan_handle_missing_return(UnreachableData *Data) {
+  GET_REPORT_OPTIONS(true);
+  handleMissingReturnImpl(Data, Opts);
+  Die();
+}
+
+static void handleVLABoundNotPositive(VLABoundData *Data, ValueHandle Bound,
+                                      ReportOptions Opts) {
+  SourceLocation Loc = Data->Loc.acquire();
+  ErrorType ET = ErrorType::NonPositiveVLAIndex;
+
+  if (ignoreReport(Loc, Opts, ET))
+    return;
+
+  ScopedReport R(Opts, Loc, ET);
+
+  Diag(Loc, DL_Error, ET, "variable length array bound evaluates to "
+                          "non-positive value %0")
+      << Value(Data->Type, Bound);
+}
+
+void __ubsan::__ubsan_handle_vla_bound_not_positive(VLABoundData *Data,
+                                                    ValueHandle Bound) {
+  GET_REPORT_OPTIONS(false);
+  handleVLABoundNotPositive(Data, Bound, Opts);
+}
+void __ubsan::__ubsan_handle_vla_bound_not_positive_abort(VLABoundData *Data,
+                                                          ValueHandle Bound) {
+  GET_REPORT_OPTIONS(true);
+  handleVLABoundNotPositive(Data, Bound, Opts);
+  Die();
+}
+
+static bool looksLikeFloatCastOverflowDataV1(void *Data) {
+  // First field is either a pointer to filename or a pointer to a
+  // TypeDescriptor.
+  u8 *FilenameOrTypeDescriptor;
+  internal_memcpy(&FilenameOrTypeDescriptor, Data,
+                  sizeof(FilenameOrTypeDescriptor));
+
+  // Heuristic: For float_cast_overflow, the TypeKind will be either TK_Integer
+  // (0x0), TK_Float (0x1) or TK_Unknown (0xff). If both types are known,
+  // adding both bytes will be 0 or 1 (for BE or LE). If it were a filename,
+  // adding two printable characters will not yield such a value. Otherwise,
+  // if one of them is 0xff, this is most likely TK_Unknown type descriptor.
+  u16 MaybeFromTypeKind =
+      FilenameOrTypeDescriptor[0] + FilenameOrTypeDescriptor[1];
+  return MaybeFromTypeKind < 2 || FilenameOrTypeDescriptor[0] == 0xff ||
+         FilenameOrTypeDescriptor[1] == 0xff;
+}
+
+static void handleFloatCastOverflow(void *DataPtr, ValueHandle From,
+                                    ReportOptions Opts) {
+  SymbolizedStackHolder CallerLoc;
+  Location Loc;
+  const TypeDescriptor *FromType, *ToType;
+  ErrorType ET = ErrorType::FloatCastOverflow;
+
+  if (looksLikeFloatCastOverflowDataV1(DataPtr)) {
+    auto Data = reinterpret_cast<FloatCastOverflowData *>(DataPtr);
+    CallerLoc.reset(getCallerLocation(Opts.pc));
+    Loc = CallerLoc;
+    FromType = &Data->FromType;
+    ToType = &Data->ToType;
+  } else {
+    auto Data = reinterpret_cast<FloatCastOverflowDataV2 *>(DataPtr);
+    SourceLocation SLoc = Data->Loc.acquire();
+    if (ignoreReport(SLoc, Opts, ET))
+      return;
+    Loc = SLoc;
+    FromType = &Data->FromType;
+    ToType = &Data->ToType;
+  }
+
+  ScopedReport R(Opts, Loc, ET);
+
+  Diag(Loc, DL_Error, ET,
+       "%0 is outside the range of representable values of type %2")
+      << Value(*FromType, From) << *FromType << *ToType;
+}
+
+void __ubsan::__ubsan_handle_float_cast_overflow(void *Data, ValueHandle From) {
+  GET_REPORT_OPTIONS(false);
+  handleFloatCastOverflow(Data, From, Opts);
+}
+void __ubsan::__ubsan_handle_float_cast_overflow_abort(void *Data,
+                                                       ValueHandle From) {
+  GET_REPORT_OPTIONS(true);
+  handleFloatCastOverflow(Data, From, Opts);
+  Die();
+}
+
+static void handleLoadInvalidValue(InvalidValueData *Data, ValueHandle Val,
+                                   ReportOptions Opts) {
+  SourceLocation Loc = Data->Loc.acquire();
+  // This check could be more precise if we used different handlers for
+  // -fsanitize=bool and -fsanitize=enum.
+  bool IsBool = (0 == internal_strcmp(Data->Type.getTypeName(), "'bool'")) ||
+                (0 == internal_strncmp(Data->Type.getTypeName(), "'BOOL'", 6));
+  ErrorType ET =
+      IsBool ? ErrorType::InvalidBoolLoad : ErrorType::InvalidEnumLoad;
+
+  if (ignoreReport(Loc, Opts, ET))
+    return;
+
+  ScopedReport R(Opts, Loc, ET);
+
+  Diag(Loc, DL_Error, ET,
+       "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(InvalidValueData *Data,
+                                                ValueHandle Val) {
+  GET_REPORT_OPTIONS(false);
+  handleLoadInvalidValue(Data, Val, Opts);
+}
+void __ubsan::__ubsan_handle_load_invalid_value_abort(InvalidValueData *Data,
+                                                      ValueHandle Val) {
+  GET_REPORT_OPTIONS(true);
+  handleLoadInvalidValue(Data, Val, Opts);
+  Die();
+}
+
+static void handleImplicitConversion(ImplicitConversionData *Data,
+                                     ReportOptions Opts, ValueHandle Src,
+                                     ValueHandle Dst) {
+  SourceLocation Loc = Data->Loc.acquire();
+  ErrorType ET = ErrorType::GenericUB;
+
+  const TypeDescriptor &SrcTy = Data->FromType;
+  const TypeDescriptor &DstTy = Data->ToType;
+
+  bool SrcSigned = SrcTy.isSignedIntegerTy();
+  bool DstSigned = DstTy.isSignedIntegerTy();
+
+  switch (Data->Kind) {
+  case ICCK_IntegerTruncation: { // Legacy, no longer used.
+    // Let's figure out what it should be as per the new types, and upgrade.
+    // If both types are unsigned, then it's an unsigned truncation.
+    // Else, it is a signed truncation.
+    if (!SrcSigned && !DstSigned) {
+      ET = ErrorType::ImplicitUnsignedIntegerTruncation;
+    } else {
+      ET = ErrorType::ImplicitSignedIntegerTruncation;
+    }
+    break;
+  }
+  case ICCK_UnsignedIntegerTruncation:
+    ET = ErrorType::ImplicitUnsignedIntegerTruncation;
+    break;
+  case ICCK_SignedIntegerTruncation:
+    ET = ErrorType::ImplicitSignedIntegerTruncation;
+    break;
+  case ICCK_IntegerSignChange:
+    ET = ErrorType::ImplicitIntegerSignChange;
+    break;
+  case ICCK_SignedIntegerTruncationOrSignChange:
+    ET = ErrorType::ImplicitSignedIntegerTruncationOrSignChange;
+    break;
+  }
+
+  if (ignoreReport(Loc, Opts, ET))
+    return;
+
+  ScopedReport R(Opts, Loc, ET);
+
+  // FIXME: is it possible to dump the values as hex with fixed width?
+
+  Diag(Loc, DL_Error, ET,
+       "implicit conversion from type %0 of value %1 (%2-bit, %3signed) to "
+       "type %4 changed the value to %5 (%6-bit, %7signed)")
+      << SrcTy << Value(SrcTy, Src) << SrcTy.getIntegerBitWidth()
+      << (SrcSigned ? "" : "un") << DstTy << Value(DstTy, Dst)
+      << DstTy.getIntegerBitWidth() << (DstSigned ? "" : "un");
+}
+
+void __ubsan::__ubsan_handle_implicit_conversion(ImplicitConversionData *Data,
+                                                 ValueHandle Src,
+                                                 ValueHandle Dst) {
+  GET_REPORT_OPTIONS(false);
+  handleImplicitConversion(Data, Opts, Src, Dst);
+}
+void __ubsan::__ubsan_handle_implicit_conversion_abort(
+    ImplicitConversionData *Data, ValueHandle Src, ValueHandle Dst) {
+  GET_REPORT_OPTIONS(true);
+  handleImplicitConversion(Data, Opts, Src, Dst);
+  Die();
+}
+
+static void handleInvalidBuiltin(InvalidBuiltinData *Data, ReportOptions Opts) {
+  SourceLocation Loc = Data->Loc.acquire();
+  ErrorType ET = ErrorType::InvalidBuiltin;
+
+  if (ignoreReport(Loc, Opts, ET))
+    return;
+
+  ScopedReport R(Opts, Loc, ET);
+
+  Diag(Loc, DL_Error, ET,
+       "passing zero to %0, which is not a valid argument")
+    << ((Data->Kind == BCK_CTZPassedZero) ? "ctz()" : "clz()");
+}
+
+void __ubsan::__ubsan_handle_invalid_builtin(InvalidBuiltinData *Data) {
+  GET_REPORT_OPTIONS(true);
+  handleInvalidBuiltin(Data, Opts);
+}
+void __ubsan::__ubsan_handle_invalid_builtin_abort(InvalidBuiltinData *Data) {
+  GET_REPORT_OPTIONS(true);
+  handleInvalidBuiltin(Data, Opts);
+  Die();
+}
+
+static void handleNonNullReturn(NonNullReturnData *Data, SourceLocation *LocPtr,
+                                ReportOptions Opts, bool IsAttr) {
+  if (!LocPtr)
+    UNREACHABLE("source location pointer is null!");
+
+  SourceLocation Loc = LocPtr->acquire();
+  ErrorType ET = ErrorType::InvalidNullReturn;
+
+  if (ignoreReport(Loc, Opts, ET))
+    return;
+
+  ScopedReport R(Opts, Loc, ET);
+
+  Diag(Loc, DL_Error, ET,
+       "null pointer returned from function declared to never return null");
+  if (!Data->AttrLoc.isInvalid())
+    Diag(Data->AttrLoc, DL_Note, ET, "%0 specified here")
+        << (IsAttr ? "returns_nonnull attribute"
+                   : "_Nonnull return type annotation");
+}
+
+void __ubsan::__ubsan_handle_nonnull_return_v1(NonNullReturnData *Data,
+                                               SourceLocation *LocPtr) {
+  GET_REPORT_OPTIONS(false);
+  handleNonNullReturn(Data, LocPtr, Opts, true);
+}
+
+void __ubsan::__ubsan_handle_nonnull_return_v1_abort(NonNullReturnData *Data,
+                                                     SourceLocation *LocPtr) {
+  GET_REPORT_OPTIONS(true);
+  handleNonNullReturn(Data, LocPtr, Opts, true);
+  Die();
+}
+
+void __ubsan::__ubsan_handle_nullability_return_v1(NonNullReturnData *Data,
+                                                   SourceLocation *LocPtr) {
+  GET_REPORT_OPTIONS(false);
+  handleNonNullReturn(Data, LocPtr, Opts, false);
+}
+
+void __ubsan::__ubsan_handle_nullability_return_v1_abort(
+    NonNullReturnData *Data, SourceLocation *LocPtr) {
+  GET_REPORT_OPTIONS(true);
+  handleNonNullReturn(Data, LocPtr, Opts, false);
+  Die();
+}
+
+static void handleNonNullArg(NonNullArgData *Data, ReportOptions Opts,
+                             bool IsAttr) {
+  SourceLocation Loc = Data->Loc.acquire();
+  ErrorType ET = ErrorType::InvalidNullArgument;
+
+  if (ignoreReport(Loc, Opts, ET))
+    return;
+
+  ScopedReport R(Opts, Loc, ET);
+
+  Diag(Loc, DL_Error, ET,
+       "null pointer passed as argument %0, which is declared to "
+       "never be null")
+      << Data->ArgIndex;
+  if (!Data->AttrLoc.isInvalid())
+    Diag(Data->AttrLoc, DL_Note, ET, "%0 specified here")
+        << (IsAttr ? "nonnull attribute" : "_Nonnull type annotation");
+}
+
+void __ubsan::__ubsan_handle_nonnull_arg(NonNullArgData *Data) {
+  GET_REPORT_OPTIONS(false);
+  handleNonNullArg(Data, Opts, true);
+}
+
+void __ubsan::__ubsan_handle_nonnull_arg_abort(NonNullArgData *Data) {
+  GET_REPORT_OPTIONS(true);
+  handleNonNullArg(Data, Opts, true);
+  Die();
+}
+
+void __ubsan::__ubsan_handle_nullability_arg(NonNullArgData *Data) {
+  GET_REPORT_OPTIONS(false);
+  handleNonNullArg(Data, Opts, false);
+}
+
+void __ubsan::__ubsan_handle_nullability_arg_abort(NonNullArgData *Data) {
+  GET_REPORT_OPTIONS(true);
+  handleNonNullArg(Data, Opts, false);
+  Die();
+}
+
+static void handlePointerOverflowImpl(PointerOverflowData *Data,
+                                      ValueHandle Base,
+                                      ValueHandle Result,
+                                      ReportOptions Opts) {
+  SourceLocation Loc = Data->Loc.acquire();
+  ErrorType ET = ErrorType::PointerOverflow;
+
+  if (ignoreReport(Loc, Opts, ET))
+    return;
+
+  ScopedReport R(Opts, Loc, ET);
+
+  if ((sptr(Base) >= 0) == (sptr(Result) >= 0)) {
+    if (Base > Result)
+      Diag(Loc, DL_Error, ET,
+           "addition of unsigned offset to %0 overflowed to %1")
+          << (void *)Base << (void *)Result;
+    else
+      Diag(Loc, DL_Error, ET,
+           "subtraction of unsigned offset from %0 overflowed to %1")
+          << (void *)Base << (void *)Result;
+  } else {
+    Diag(Loc, DL_Error, ET,
+         "pointer index expression with base %0 overflowed to %1")
+        << (void *)Base << (void *)Result;
+  }
+}
+
+void __ubsan::__ubsan_handle_pointer_overflow(PointerOverflowData *Data,
+                                              ValueHandle Base,
+                                              ValueHandle Result) {
+  GET_REPORT_OPTIONS(false);
+  handlePointerOverflowImpl(Data, Base, Result, Opts);
+}
+
+void __ubsan::__ubsan_handle_pointer_overflow_abort(PointerOverflowData *Data,
+                                                    ValueHandle Base,
+                                                    ValueHandle Result) {
+  GET_REPORT_OPTIONS(true);
+  handlePointerOverflowImpl(Data, Base, Result, Opts);
+  Die();
+}
+
+static void handleCFIBadIcall(CFICheckFailData *Data, ValueHandle Function,
+                              ReportOptions Opts) {
+  if (Data->CheckKind != CFITCK_ICall && Data->CheckKind != CFITCK_NVMFCall)
+    Die();
+
+  SourceLocation Loc = Data->Loc.acquire();
+  ErrorType ET = ErrorType::CFIBadType;
+
+  if (ignoreReport(Loc, Opts, ET))
+    return;
+
+  ScopedReport R(Opts, Loc, ET);
+
+  const char *CheckKindStr = Data->CheckKind == CFITCK_NVMFCall
+                                 ? "non-virtual pointer to member function call"
+                                 : "indirect function call";
+  Diag(Loc, DL_Error, ET,
+       "control flow integrity check for type %0 failed during %1")
+      << Data->Type << CheckKindStr;
+
+  SymbolizedStackHolder FLoc(getSymbolizedLocation(Function));
+  const char *FName = FLoc.get()->info.function;
+  if (!FName)
+    FName = "(unknown)";
+  Diag(FLoc, DL_Note, ET, "%0 defined here") << FName;
+
+  // If the failure involved different DSOs for the check location and icall
+  // target, report the DSO names.
+  const char *DstModule = FLoc.get()->info.module;
+  if (!DstModule)
+    DstModule = "(unknown)";
+
+  const char *SrcModule = Symbolizer::GetOrInit()->GetModuleNameForPc(Opts.pc);
+  if (!SrcModule)
+    SrcModule = "(unknown)";
+
+  if (internal_strcmp(SrcModule, DstModule))
+    Diag(Loc, DL_Note, ET,
+         "check failed in %0, destination function located in %1")
+        << SrcModule << DstModule;
+}
+
+namespace __ubsan {
+
+#ifdef UBSAN_CAN_USE_CXXABI
+
+#ifdef _WIN32
+
+extern "C" void __ubsan_handle_cfi_bad_type_default(CFICheckFailData *Data,
+                                                    ValueHandle Vtable,
+                                                    bool ValidVtable,
+                                                    ReportOptions Opts) {
+  Die();
+}
+
+WIN_WEAK_ALIAS(__ubsan_handle_cfi_bad_type, __ubsan_handle_cfi_bad_type_default)
+#else
+SANITIZER_WEAK_ATTRIBUTE
+#endif
+void __ubsan_handle_cfi_bad_type(CFICheckFailData *Data, ValueHandle Vtable,
+                                 bool ValidVtable, ReportOptions Opts);
+
+#else
+void __ubsan_handle_cfi_bad_type(CFICheckFailData *Data, ValueHandle Vtable,
+                                 bool ValidVtable, ReportOptions Opts) {
+  Die();
+}
+#endif
+
+}  // namespace __ubsan
+
+void __ubsan::__ubsan_handle_cfi_check_fail(CFICheckFailData *Data,
+                                            ValueHandle Value,
+                                            uptr ValidVtable) {
+  GET_REPORT_OPTIONS(false);
+  if (Data->CheckKind == CFITCK_ICall || Data->CheckKind == CFITCK_NVMFCall)
+    handleCFIBadIcall(Data, Value, Opts);
+  else
+    __ubsan_handle_cfi_bad_type(Data, Value, ValidVtable, Opts);
+}
+
+void __ubsan::__ubsan_handle_cfi_check_fail_abort(CFICheckFailData *Data,
+                                                  ValueHandle Value,
+                                                  uptr ValidVtable) {
+  GET_REPORT_OPTIONS(true);
+  if (Data->CheckKind == CFITCK_ICall || Data->CheckKind == CFITCK_NVMFCall)
+    handleCFIBadIcall(Data, Value, Opts);
+  else
+    __ubsan_handle_cfi_bad_type(Data, Value, ValidVtable, Opts);
+  Die();
+}
+
+#endif  // CAN_SANITIZE_UB