[compiler-rt] [CompilerRT] Add numerical sanitizer (PR #94322)

[Vitaly Buka via llvm-commits]

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@@ -0,0 +1,224 @@
+//===-- nsan.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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of NumericalStabilitySanitizer.
+//
+// Private NSan header.
+//===----------------------------------------------------------------------===//
+
+#ifndef NSAN_H
+#define NSAN_H
+
+#include "sanitizer_common/sanitizer_internal_defs.h"
+
+using __sanitizer::sptr;
+using __sanitizer::u16;
+using __sanitizer::uptr;
+
+#include "nsan_platform.h"
+
+#include <assert.h>
+#include <float.h>
+#include <limits.h>
+#include <math.h>
+#include <stdio.h>
+
+// Private nsan interface. Used e.g. by interceptors.
+extern "C" {
+
+// This marks the shadow type of the given block of application memory as
+// unknown.
+// printf-free (see comment in nsan_interceptors.cc).
+void __nsan_set_value_unknown(const char *addr, uptr size);
+
+// Copies annotations in the shadow memory for a block of application memory to
+// a new address. This function is used together with memory-copying functions
+// in application memory, e.g. the instrumentation inserts
+// `__nsan_copy_values(dest, src, size)` after builtin calls to
+// `memcpy(dest, src, size)`. Intercepted memcpy calls also call this function.
+// printf-free (see comment in nsan_interceptors.cc).
+void __nsan_copy_values(const char *daddr, const char *saddr, uptr size);
+
+SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE const char *
+__nsan_default_options();
+}
+
+namespace __nsan {
+
+extern bool NsanInitialized;
+extern bool NsanInitIsRunning;
+
+void initializeInterceptors();
+
+// See notes in nsan_platform.
+// printf-free (see comment in nsan_interceptors.cc).
+inline char *getShadowAddrFor(char *Ptr) {
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vitalybuka wrote:

u8* and the rest?

https://github.com/llvm/llvm-project/pull/94322