1 files changed, 97 insertions, 0 deletions
diff --git a/lib/scudo/standalone/secondary.h b/lib/scudo/standalone/secondary.h
new file mode 100644
index 000000000..016928cc6
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+++ b/lib/scudo/standalone/secondary.h
@@ -0,0 +1,97 @@
+//===-- secondary.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_SECONDARY_H_
+#define SCUDO_SECONDARY_H_
+
+#include "common.h"
+#include "mutex.h"
+#include "stats.h"
+
+namespace scudo {
+
+// This allocator wraps the platform allocation primitives, and as such is on
+// the slower side and should preferably be used for larger sized allocations.
+// Blocks allocated will be preceded and followed by a guard page, and hold
+// their own header that is not checksummed: the guard pages and the Combined
+// header should be enough for our purpose.
+
+namespace LargeBlock {
+
+struct Header {
+  LargeBlock::Header *Prev;
+  LargeBlock::Header *Next;
+  uptr BlockEnd;
+  uptr MapBase;
+  uptr MapSize;
+  MapPlatformData Data;
+};
+
+constexpr uptr getHeaderSize() {
+  return roundUpTo(sizeof(Header), 1U << SCUDO_MIN_ALIGNMENT_LOG);
+}
+
+static Header *getHeader(uptr Ptr) {
+  return reinterpret_cast<Header *>(Ptr - getHeaderSize());
+}
+
+static Header *getHeader(const void *Ptr) {
+  return getHeader(reinterpret_cast<uptr>(Ptr));
+}
+
+} // namespace LargeBlock
+
+class MapAllocator {
+public:
+  void initLinkerInitialized(GlobalStats *S) {
+    Stats.initLinkerInitialized();
+    if (S)
+      S->link(&Stats);
+  }
+  void init(GlobalStats *S) {
+    memset(this, 0, sizeof(*this));
+    initLinkerInitialized(S);
+  }
+
+  void *allocate(uptr Size, uptr AlignmentHint = 0, uptr *BlockEnd = nullptr);
+
+  void deallocate(void *Ptr);
+
+  static uptr getBlockEnd(void *Ptr) {
+    return LargeBlock::getHeader(Ptr)->BlockEnd;
+  }
+
+  static uptr getBlockSize(void *Ptr) {
+    return getBlockEnd(Ptr) - reinterpret_cast<uptr>(Ptr);
+  }
+
+  void printStats() const;
+
+  void disable() { Mutex.lock(); }
+
+  void enable() { Mutex.unlock(); }
+
+  template <typename F> void iterateOverBlocks(F Callback) const {
+    for (LargeBlock::Header *H = Tail; H != nullptr; H = H->Prev)
+      Callback(reinterpret_cast<uptr>(H) + LargeBlock::getHeaderSize());
+  }
+
+private:
+  StaticSpinMutex Mutex;
+  LargeBlock::Header *Tail;
+  uptr AllocatedBytes;
+  uptr FreedBytes;
+  uptr LargestSize;
+  u32 NumberOfAllocs;
+  u32 NumberOfFrees;
+  LocalStats Stats;
+};
+
+} // namespace scudo
+
+#endif // SCUDO_SECONDARY_H_