Merge pull request #23529 from alexrp/2879-groundwork

Introduce libzigc for libc function implementations in Zig

1 files changed, 55 insertions, 0 deletions

diff --git a/lib/libtsan/interception/interception_linux.h b/lib/libtsan/interception/interception_linux.h
new file mode 100644
index 0000000000..2e01ff4457
--- /dev/null
+++ b/lib/libtsan/interception/interception_linux.h
@@ -0,0 +1,55 @@
+//===-- interception_linux.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 AddressSanitizer, an address sanity checker.
+//
+// Linux-specific interception methods.
+//===----------------------------------------------------------------------===//
+
+#if SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD || \
+    SANITIZER_SOLARIS
+
+#if !defined(INCLUDED_FROM_INTERCEPTION_LIB)
+# error interception_linux.h should be included from interception library only
+#endif
+
+#ifndef INTERCEPTION_LINUX_H
+#define INTERCEPTION_LINUX_H
+
+namespace __interception {
+bool InterceptFunction(const char *name, uptr *ptr_to_real, uptr func,
+                       uptr trampoline);
+bool InterceptFunction(const char *name, const char *ver, uptr *ptr_to_real,
+                       uptr func, uptr trampoline);
+}  // namespace __interception
+
+// Cast func to type of REAL(func) before casting to uptr in case it is an
+// overloaded function, which is the case for some glibc functions when
+// _FORTIFY_SOURCE is used. This disambiguates which overload to use.
+#define INTERCEPT_FUNCTION_LINUX_OR_FREEBSD(func)            \
+  ::__interception::InterceptFunction(                       \
+      #func, (::__interception::uptr *)&REAL(func),          \
+      (::__interception::uptr)(decltype(REAL(func)))&(func), \
+      (::__interception::uptr) &TRAMPOLINE(func))
+
+// dlvsym is a GNU extension supported by some other platforms.
+#if SANITIZER_GLIBC || SANITIZER_FREEBSD || SANITIZER_NETBSD
+#define INTERCEPT_FUNCTION_VER_LINUX_OR_FREEBSD(func, symver) \
+  ::__interception::InterceptFunction(                        \
+      #func, symver,                                          \
+      (::__interception::uptr *)&REAL(func),                  \
+      (::__interception::uptr)(decltype(REAL(func)))&(func),  \
+      (::__interception::uptr)&TRAMPOLINE(func))
+#else
+#define INTERCEPT_FUNCTION_VER_LINUX_OR_FREEBSD(func, symver) \
+  INTERCEPT_FUNCTION_LINUX_OR_FREEBSD(func)
+#endif  // SANITIZER_GLIBC || SANITIZER_FREEBSD || SANITIZER_NETBSD
+
+#endif  // INTERCEPTION_LINUX_H
+#endif  // SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD ||
+        // SANITIZER_SOLARIS