ro: reduce memory usage by excising (unused) std::malloc

libraries/libstratosphere/Makefile

@@ -122,6 +122,8 @@ $(OFILES)	:	$(GCH_FILES)
 
 $(OFILES_SRC)	: $(HFILES_BIN)
 
+ams_environment_weak.o: CXXFLAGS += -fno-lto
+
 #---------------------------------------------------------------------------------
 %_bin.h %.bin.o	:	%.bin
 #---------------------------------------------------------------------------------

libraries/libstratosphere/include/stratosphere/ams/ams_environment.hpp

@@ -26,4 +26,7 @@ namespace ams {
     void InitializeForBoot();
     void SetInitialRebootPayload(const void *src, size_t src_size);
 
+    void *Malloc(size_t size);
+    void Free(void *ptr);
+
 }

libraries/libstratosphere/source/ams/ams_environment_weak.cpp

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <stratosphere.hpp>
+
+namespace ams {
+
+    WEAK_SYMBOL void *Malloc(size_t size) {
+        return std::malloc(size);
+    }
+
+    WEAK_SYMBOL void Free(void *ptr) {
+        return std::free(ptr);
+    }
+
+}

libraries/libstratosphere/source/fs/fs_memory_management.cpp

@@ -23,16 +23,16 @@ namespace ams::fs {
 
         void *DefaultAllocate(size_t size) {
             g_used_default_allocator = true;
-            return std::malloc(size);
+            return ams::Malloc(size);
         }
 
         void DefaultDeallocate(void *ptr, size_t size) {
-            std::free(ptr);
+            ams::Free(ptr);
         }
 
-        os::Mutex g_lock(false);
+        constinit os::SdkMutex g_lock;
-        AllocateFunction g_allocate_func     = DefaultAllocate;
+        constinit AllocateFunction g_allocate_func     = DefaultAllocate;
-        DeallocateFunction g_deallocate_func = DefaultDeallocate;
+        constinit DeallocateFunction g_deallocate_func = DefaultDeallocate;
 
         constexpr size_t RequiredAlignment = alignof(u64);
 

libraries/libstratosphere/source/os/impl/os_waitable_manager_target_impl.os.horizon.cpp

@@ -37,7 +37,7 @@ namespace ams::os::impl {
         return ResultSuccess();
     }
 
-    Result ReplyAndReceiveN(s32 *out_index, s32 num, Handle arr[], s32 array_size, s64 ns, Handle reply_target) {
+    Result WaitableManagerHorizonImpl::ReplyAndReceiveN(s32 *out_index, s32 num, Handle arr[], s32 array_size, s64 ns, Handle reply_target) {
         /* NOTE: Nintendo does not initialize this value, which seems like it can cause incorrect behavior. */
         s32 index = WaitableManagerImpl::WaitInvalid;
         static_assert(WaitableManagerImpl::WaitInvalid != -1);

stratosphere/ro/source/ro_main.cpp

@@ -170,8 +170,15 @@ void __appExit(void) {
     setsysExit();
 }
 
-namespace {
+namespace ams {
 
+    void *Malloc(size_t size) {
+        AMS_ABORT("ams::Malloc was called");
+    }
+
+    void Free(void *ptr) {
+        AMS_ABORT("ams::Free was called");
+    }
 
 }