1 files changed, 70 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/scudo/standalone/wrappers_c_checks.h b/contrib/llvm-project/compiler-rt/lib/scudo/standalone/wrappers_c_checks.h
new file mode 100644
index 000000000000..d0288699cf1b
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/scudo/standalone/wrappers_c_checks.h
@@ -0,0 +1,70 @@
+//===-- wrappers_c_checks.h -------------------------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SCUDO_CHECKS_H_
+#define SCUDO_CHECKS_H_
+
+#include "common.h"
+
+#include <errno.h>
+
+#ifndef __has_builtin
+#define __has_builtin(X) 0
+#endif
+
+namespace scudo {
+
+// A common errno setting logic shared by almost all Scudo C wrappers.
+inline void *setErrnoOnNull(void *Ptr) {
+  if (UNLIKELY(!Ptr))
+    errno = ENOMEM;
+  return Ptr;
+}
+
+// Checks return true on failure.
+
+// Checks aligned_alloc() parameters, verifies that the alignment is a power of
+// two and that the size is a multiple of alignment.
+inline bool checkAlignedAllocAlignmentAndSize(uptr Alignment, uptr Size) {
+  return !isPowerOfTwo(Alignment) || !isAligned(Size, Alignment);
+}
+
+// Checks posix_memalign() parameters, verifies that alignment is a power of two
+// and a multiple of sizeof(void *).
+inline bool checkPosixMemalignAlignment(uptr Alignment) {
+  return !isPowerOfTwo(Alignment) || !isAligned(Alignment, sizeof(void *));
+}
+
+// Returns true if calloc(Size, N) overflows on Size*N calculation. Use a
+// builtin supported by recent clang & GCC if it exists, otherwise fallback to a
+// costly division.
+inline bool checkForCallocOverflow(uptr Size, uptr N, uptr *Product) {
+#if __has_builtin(__builtin_umull_overflow) && (SCUDO_WORDSIZE == 64U)
+  return __builtin_umull_overflow(Size, N,
+                                  reinterpret_cast<unsigned long *>(Product));
+#elif __has_builtin(__builtin_umul_overflow) && (SCUDO_WORDSIZE == 32U)
+  // On, e.g. armv7, uptr/uintptr_t may be defined as unsigned long
+  return __builtin_umul_overflow(Size, N,
+                                 reinterpret_cast<unsigned int *>(Product));
+#else
+  *Product = Size * N;
+  if (!Size)
+    return false;
+  return (*Product / Size) != N;
+#endif
+}
+
+// Returns true if the size passed to pvalloc overflows when rounded to the next
+// multiple of PageSize.
+inline bool checkForPvallocOverflow(uptr Size, uptr PageSize) {
+  return roundUp(Size, PageSize) < Size;
+}
+
+} // namespace scudo
+
+#endif // SCUDO_CHECKS_H_