[memory] Move "Local\\" prefix to win impl

CreateFileMappingHandle now takes shared memory name without a prefix.
The doc of shm_open recommends not using slashes and prefixing with "/".
The prefixing has been moved to the os implementation layer.
Invocations of CreateFileMappingHandle were all using "Local\\" so these
prefixes were removed.

src/xenia/base/memory_posix.cc

@@ -88,7 +88,8 @@ FileMappingHandle CreateFileMappingHandle(const std::filesystem::path& path,
   }
 
   oflag |= O_CREAT;
-  int ret = shm_open(path.c_str(), oflag, 0777);
+  auto full_path = "/" / path;
+  int ret = shm_open(full_path.c_str(), oflag, 0777);
   if (ret > 0) {
     ftruncate64(ret, length);
   }

src/xenia/base/memory_win.cc

@@ -147,9 +147,10 @@ FileMappingHandle CreateFileMappingHandle(const std::filesystem::path& path,
                                           bool commit) {
   DWORD protect =
       ToWin32ProtectFlags(access) | (commit ? SEC_COMMIT : SEC_RESERVE);
+  auto full_path = "Local" / path;
   return CreateFileMappingW(INVALID_HANDLE_VALUE, NULL, protect,
                             static_cast<DWORD>(length >> 32),
-                            static_cast<DWORD>(length), path.c_str());
+                            static_cast<DWORD>(length), full_path.c_str());
 }
 
 void CloseFileMappingHandle(FileMappingHandle handle) { CloseHandle(handle); }

src/xenia/base/testing/memory_test.cc

@@ -418,7 +418,7 @@ TEST_CASE("copy_and_swap_16_in_32_unaligned", "Copy and Swap") {
 }
 
 TEST_CASE("create_and_close_file_mapping", "Virtual Memory Mapping") {
-  auto path = fmt::format("Local\\xenia_test_{}", Clock::QueryHostTickCount());
+  auto path = fmt::format("xenia_test_{}", Clock::QueryHostTickCount());
   auto memory = xe::memory::CreateFileMappingHandle(
       path, 0x100, xe::memory::PageAccess::kReadWrite, true);
   REQUIRE(memory);
@@ -426,7 +426,7 @@ TEST_CASE("create_and_close_file_mapping", "Virtual Memory Mapping") {
 }
 
 TEST_CASE("map_view", "Virtual Memory Mapping") {
-  auto path = fmt::format("Local\\xenia_test_{}", Clock::QueryHostTickCount());
+  auto path = fmt::format("xenia_test_{}", Clock::QueryHostTickCount());
   const size_t length = 0x100;
   auto memory = xe::memory::CreateFileMappingHandle(
       path, length, xe::memory::PageAccess::kReadWrite, true);
@@ -444,7 +444,7 @@ TEST_CASE("map_view", "Virtual Memory Mapping") {
 
 TEST_CASE("read_write_view", "Virtual Memory Mapping") {
   const size_t length = 0x100;
-  auto path = fmt::format("Local\\xenia_test_{}", Clock::QueryHostTickCount());
+  auto path = fmt::format("xenia_test_{}", Clock::QueryHostTickCount());
   auto memory = xe::memory::CreateFileMappingHandle(
       path, length, xe::memory::PageAccess::kReadWrite, true);
   REQUIRE(memory);

src/xenia/cpu/backend/x64/x64_code_cache.cc

@@ -63,8 +63,7 @@ bool X64CodeCache::Initialize() {
   }
 
   // Create mmap file. This allows us to share the code cache with the debugger.
-  file_name_ =
-      fmt::format("Local\\xenia_code_cache_{}", Clock::QueryHostTickCount());
+  file_name_ = fmt::format("xenia_code_cache_{}", Clock::QueryHostTickCount());
   mapping_ = xe::memory::CreateFileMappingHandle(
       file_name_, kGeneratedCodeSize, xe::memory::PageAccess::kExecuteReadWrite,
       false);

src/xenia/memory.cc

@@ -125,8 +125,7 @@ Memory::~Memory() {
 }
 
 bool Memory::Initialize() {
-  file_name_ =
-      fmt::format("Local\\xenia_memory_{}", Clock::QueryHostTickCount());
+  file_name_ = fmt::format("xenia_memory_{}", Clock::QueryHostTickCount());
 
   // Create main page file-backed mapping. This is all reserved but
   // uncommitted (so it shouldn't expand page file).