Bug 1786451 - Part 1: Export MozVirtualAlloc as part of the jemalloc API r=glandium

This will allow this function to be used by the JS engine too.

Differential Revision: https://phabricator.services.mozilla.com/D226462

memory/build/mozjemalloc.cpp

@@ -1665,14 +1665,24 @@ static inline StallSpecs GetStallSpecs() {
 #  endif
 }
 
+}  // namespace MozAllocRetries
+
+namespace mozilla {
+
+StallSpecs GetAllocatorStallSpecs() {
+  return ::MozAllocRetries::GetStallSpecs();
+}
+
 // Drop-in wrapper around VirtualAlloc. When out of memory, may attempt to stall
 // and retry rather than returning immediately, in hopes that the page file is
 // about to be expanded by Windows.
 //
 // Ref:
 // https://docs.microsoft.com/en-us/troubleshoot/windows-client/performance/slow-page-file-growth-memory-allocation-errors
-[[nodiscard]] void* MozVirtualAlloc(LPVOID lpAddress, SIZE_T dwSize,
-                                    DWORD flAllocationType, DWORD flProtect) {
+void* MozVirtualAlloc(LPVOID lpAddress, SIZE_T dwSize, DWORD flAllocationType,
+                      DWORD flProtect) {
+  using namespace MozAllocRetries;
+
   DWORD const lastError = ::GetLastError();
 
   constexpr auto IsOOMError = [] {
@@ -1727,14 +1737,7 @@ static inline StallSpecs GetStallSpecs() {
 
   return ret.value_or(nullptr);
 }
-}  // namespace MozAllocRetries
 
-using MozAllocRetries::MozVirtualAlloc;
-
-namespace mozilla {
-MOZ_JEMALLOC_API StallSpecs GetAllocatorStallSpecs() {
-  return ::MozAllocRetries::GetStallSpecs();
-}
 }  // namespace mozilla
 
 #endif  // XP_WIN

memory/build/mozmemory_utils.h

@@ -11,6 +11,7 @@
 #include <type_traits>
 
 #if defined(MOZ_MEMORY) && defined(XP_WIN)
+#  include <wtypes.h>
 #  include "mozmemory_wrap.h"
 #endif
 
@@ -68,6 +69,10 @@ struct StallSpecs {
 
 #if defined(MOZ_MEMORY) && defined(XP_WIN)
 MOZ_JEMALLOC_API StallSpecs GetAllocatorStallSpecs();
+MOZ_JEMALLOC_API_NODISCARD void* MozVirtualAlloc(LPVOID lpAddress,
+                                                 SIZE_T dwSize,
+                                                 DWORD flAllocationType,
+                                                 DWORD flProtect);
 #endif
 
 }  // namespace mozilla

memory/build/mozmemory_wrap.h

@@ -106,6 +106,7 @@
 
 #ifdef MOZ_MEMORY_IMPL
 #  define MOZ_JEMALLOC_API MOZ_EXTERN_C MFBT_API
+#  define MOZ_JEMALLOC_API_NODISCARD MOZ_EXTERN_C [[nodiscard]] MFBT_API
 #  if defined(XP_WIN)
 #    define mozmem_malloc_impl(a) je_##a
 #  else
@@ -119,6 +120,7 @@
 #if !defined(MOZ_MEMORY_IMPL)
 #  define MOZ_MEMORY_API MOZ_EXTERN_C MFBT_API
 #  define MOZ_JEMALLOC_API MOZ_EXTERN_C MFBT_API
+#  define MOZ_JEMALLOC_API_NODISCARD MOZ_EXTERN_C [[nodiscard]] MFBT_API
 #endif
 
 #ifndef MOZ_MEMORY_API
@@ -126,6 +128,7 @@
 #endif
 #ifndef MOZ_JEMALLOC_API
 #  define MOZ_JEMALLOC_API MOZ_EXTERN_C
+#  define MOZ_JEMALLOC_API_NODISCARD MOZ_EXTERN_C [[nodiscard]]
 #endif
 
 #ifndef mozmem_malloc_impl