Merge pull request #23529 from alexrp/2879-groundwork

Introduce libzigc for libc function implementations in Zig

1 files changed, 58 insertions, 0 deletions

diff --git a/lib/libtsan/sanitizer_common/sanitizer_redefine_builtins.h b/lib/libtsan/sanitizer_common/sanitizer_redefine_builtins.h
new file mode 100644
index 0000000000..41e0613d6f
--- /dev/null
+++ b/lib/libtsan/sanitizer_common/sanitizer_redefine_builtins.h
@@ -0,0 +1,58 @@
+//===-- sanitizer_redefine_builtins.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
+//
+//===----------------------------------------------------------------------===//
+//
+// Redefine builtin functions to use internal versions. This is needed where
+// compiler optimizations end up producing unwanted libcalls!
+//
+//===----------------------------------------------------------------------===//
+#ifndef SANITIZER_COMMON_NO_REDEFINE_BUILTINS
+#  ifndef SANITIZER_REDEFINE_BUILTINS_H
+#    define SANITIZER_REDEFINE_BUILTINS_H
+
+// The asm hack only works with GCC and Clang.
+#    if !defined(_WIN32)
+
+asm(R"(
+    .set memcpy, __sanitizer_internal_memcpy
+    .set memmove, __sanitizer_internal_memmove
+    .set memset, __sanitizer_internal_memset
+    )");
+
+#      if defined(__cplusplus) && \
+          !defined(SANITIZER_COMMON_REDEFINE_BUILTINS_IN_STD)
+
+// The builtins should not be redefined in source files that make use of C++
+// standard libraries, in particular where C++STL headers with inline functions
+// are used. The redefinition in such cases would lead to ODR violations.
+//
+// Try to break the build in common cases where builtins shouldn't be redefined.
+namespace std {
+class Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file {
+  Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file(
+      const Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file&) = delete;
+  Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file& operator=(
+      const Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file&) = delete;
+};
+using array = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
+using atomic = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
+using function = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
+using map = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
+using set = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
+using shared_ptr = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
+using string = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
+using unique_ptr = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
+using unordered_map = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
+using unordered_set = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
+using vector = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
+}  // namespace std
+
+#      endif  // __cpluplus
+#    endif    // !_WIN32
+
+#  endif  // SANITIZER_REDEFINE_BUILTINS_H
+#endif    // SANITIZER_COMMON_NO_REDEFINE_BUILTINS