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-rw-r--r--memory/mozalloc/winheap.cpp55
1 files changed, 55 insertions, 0 deletions
diff --git a/memory/mozalloc/winheap.cpp b/memory/mozalloc/winheap.cpp
new file mode 100644
index 0000000000..1d2e1e5599
--- /dev/null
+++ b/memory/mozalloc/winheap.cpp
@@ -0,0 +1,55 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=4 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/mozalloc.h"
+#include <windows.h>
+
+#if !defined(MOZ_MEMORY)
+# include <malloc.h>
+# define malloc_impl malloc
+# define calloc_impl calloc
+# define realloc_impl realloc
+# define free_impl free
+#endif
+
+// Warning: C4273: 'HeapAlloc': inconsistent dll linkage
+// The Windows headers define HeapAlloc as dllimport, but we define it as
+// dllexport, which is a voluntary inconsistency.
+#pragma warning(disable : 4273)
+
+MFBT_API
+LPVOID WINAPI HeapAlloc(_In_ HANDLE hHeap, _In_ DWORD dwFlags,
+ _In_ SIZE_T dwBytes) {
+ if (dwFlags & HEAP_ZERO_MEMORY) {
+ return calloc_impl(1, dwBytes);
+ }
+ return malloc_impl(dwBytes);
+}
+
+MFBT_API
+LPVOID WINAPI HeapReAlloc(_In_ HANDLE hHeap, _In_ DWORD dwFlags,
+ _In_ LPVOID lpMem, _In_ SIZE_T dwBytes) {
+ // The HeapReAlloc contract is that failures preserve the existing
+ // allocation. We can't try to realloc in-place without possibly
+ // freeing the original allocation, breaking the contract.
+ // We also can't guarantee we zero all the memory from the end of
+ // the original allocation to the end of the new one because of the
+ // difference between the originally requested size and what
+ // malloc_usable_size would return us.
+ // So for both cases, just tell the caller we can't do what they
+ // requested.
+ if (dwFlags & (HEAP_REALLOC_IN_PLACE_ONLY | HEAP_ZERO_MEMORY)) {
+ return NULL;
+ }
+ return realloc_impl(lpMem, dwBytes);
+}
+
+MFBT_API
+BOOL WINAPI HeapFree(_In_ HANDLE hHeap, _In_ DWORD dwFlags, _In_ LPVOID lpMem) {
+ free_impl(lpMem);
+ return true;
+}