move Arena, ThreadCachedArena, and Malloc to memory/

[folly.git] / folly / memory / detail / MallocImpl.cpp

diff --git a/folly/memory/detail/MallocImpl.cpp b/folly/memory/detail/MallocImpl.cpp
new file mode 100644 (file)
index 0000000..3c4f6dd
--- /dev/null
+++ b/folly/memory/detail/MallocImpl.cpp
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2017 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <folly/memory/detail/MallocImpl.h>
+
+extern "C" {
+
+#ifdef _MSC_VER
+// MSVC doesn't have weak symbols, so do some linker magic
+// to emulate them. (the magic is in the header)
+const char* mallocxWeak = nullptr;
+const char* rallocxWeak = nullptr;
+const char* xallocxWeak = nullptr;
+const char* sallocxWeak = nullptr;
+const char* dallocxWeak = nullptr;
+const char* sdallocxWeak = nullptr;
+const char* nallocxWeak = nullptr;
+const char* mallctlWeak = nullptr;
+const char* mallctlnametomibWeak = nullptr;
+const char* mallctlbymibWeak = nullptr;
+#elif !FOLLY_HAVE_WEAK_SYMBOLS
+void* (*mallocx)(size_t, int) = nullptr;
+void* (*rallocx)(void*, size_t, int) = nullptr;
+size_t (*xallocx)(void*, size_t, size_t, int) = nullptr;
+size_t (*sallocx)(const void*, int) = nullptr;
+void (*dallocx)(void*, int) = nullptr;
+void (*sdallocx)(void*, size_t, int) = nullptr;
+size_t (*nallocx)(size_t, int) = nullptr;
+int (*mallctl)(const char*, void*, size_t*, void*, size_t) = nullptr;
+int (*mallctlnametomib)(const char*, size_t*, size_t*) = nullptr;
+int (*mallctlbymib)(const size_t*, size_t, void*, size_t*, void*, size_t) =
+    nullptr;
+#endif
+
+}