1 files changed, 74 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/scudo/standalone/options.h b/contrib/llvm-project/compiler-rt/lib/scudo/standalone/options.h
new file mode 100644
index 000000000000..b20142a41590
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/scudo/standalone/options.h
@@ -0,0 +1,74 @@
+//===-- options.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_OPTIONS_H_
+#define SCUDO_OPTIONS_H_
+
+#include "atomic_helpers.h"
+#include "common.h"
+#include "memtag.h"
+
+namespace scudo {
+
+enum class OptionBit {
+  MayReturnNull,
+  FillContents0of2,
+  FillContents1of2,
+  DeallocTypeMismatch,
+  DeleteSizeMismatch,
+  TrackAllocationStacks,
+  UseOddEvenTags,
+  UseMemoryTagging,
+  AddLargeAllocationSlack,
+};
+
+struct Options {
+  u32 Val;
+
+  bool get(OptionBit Opt) const { return Val & (1U << static_cast<u32>(Opt)); }
+
+  FillContentsMode getFillContentsMode() const {
+    return static_cast<FillContentsMode>(
+        (Val >> static_cast<u32>(OptionBit::FillContents0of2)) & 3);
+  }
+};
+
+template <typename Config> bool useMemoryTagging(const Options &Options) {
+  return allocatorSupportsMemoryTagging<Config>() &&
+         Options.get(OptionBit::UseMemoryTagging);
+}
+
+struct AtomicOptions {
+  atomic_u32 Val = {};
+
+  Options load() const { return Options{atomic_load_relaxed(&Val)}; }
+
+  void clear(OptionBit Opt) {
+    atomic_fetch_and(&Val, ~(1U << static_cast<u32>(Opt)),
+                     memory_order_relaxed);
+  }
+
+  void set(OptionBit Opt) {
+    atomic_fetch_or(&Val, 1U << static_cast<u32>(Opt), memory_order_relaxed);
+  }
+
+  void setFillContentsMode(FillContentsMode FillContents) {
+    u32 Opts = atomic_load_relaxed(&Val), NewOpts;
+    do {
+      NewOpts = Opts;
+      NewOpts &= ~(3U << static_cast<u32>(OptionBit::FillContents0of2));
+      NewOpts |= static_cast<u32>(FillContents)
+                 << static_cast<u32>(OptionBit::FillContents0of2);
+    } while (!atomic_compare_exchange_strong(&Val, &Opts, NewOpts,
+                                             memory_order_relaxed));
+  }
+};
+
+} // namespace scudo
+
+#endif // SCUDO_OPTIONS_H_