[sanitizer] Replace ALIGNED with alignas

C++11 `alignas` is already used extensively. `alignas` must precede
`static`, so adjust the ordering accordingly.

msan.cpp: Clang 15 doesn't allow `__attribute__((visibility("default"))) alignas(16)`.
Use the order `alignas(16) SANITIZER_INTERFACE_ATTRIBUTE`. Tested with Clang 7.

Pull Request: #98958

Author: MaskRay

compiler-rt/lib/asan/asan_globals_win.cpp

@@ -17,10 +17,10 @@ namespace __asan {
 
 #pragma section(".ASAN$GA", read, write)
 #pragma section(".ASAN$GZ", read, write)
-extern "C" __declspec(allocate(".ASAN$GA"))
-    ALIGNED(sizeof(__asan_global)) __asan_global __asan_globals_start = {};
-extern "C" __declspec(allocate(".ASAN$GZ"))
-    ALIGNED(sizeof(__asan_global)) __asan_global __asan_globals_end = {};
+extern "C" alignas(sizeof(__asan_global))
+    __declspec(allocate(".ASAN$GA")) __asan_global __asan_globals_start = {};
+extern "C" alignas(sizeof(__asan_global))
+    __declspec(allocate(".ASAN$GZ")) __asan_global __asan_globals_end = {};
 #pragma comment(linker, "/merge:.ASAN=.data")
 
 static void call_on_globals(void (*hook)(__asan_global *, uptr)) {

compiler-rt/lib/asan/asan_malloc_linux.cpp

@@ -185,11 +185,11 @@ struct MallocDebugL {
   void* (*valloc)(uptr size);
 };
 
-ALIGNED(32) const MallocDebugK asan_malloc_dispatch_k = {
+alignas(32) const MallocDebugK asan_malloc_dispatch_k = {
     WRAP(malloc),  WRAP(free),     WRAP(calloc),
     WRAP(realloc), WRAP(memalign), WRAP(malloc_usable_size)};
 
-ALIGNED(32) const MallocDebugL asan_malloc_dispatch_l = {
+alignas(32) const MallocDebugL asan_malloc_dispatch_l = {
     WRAP(calloc),         WRAP(free),               WRAP(mallinfo),
     WRAP(malloc),         WRAP(malloc_usable_size), WRAP(memalign),
     WRAP(posix_memalign), WRAP(pvalloc),            WRAP(realloc),

compiler-rt/lib/asan/asan_report.cpp

@@ -34,8 +34,8 @@ namespace __asan {
 // -------------------- User-specified callbacks ----------------- {{{1
 static void (*error_report_callback)(const char*);
 using ErrorMessageBuffer = InternalMmapVectorNoCtor<char, true>;
-static ALIGNED(
-    alignof(ErrorMessageBuffer)) char error_message_buffer_placeholder
+alignas(
+    alignof(ErrorMessageBuffer)) static char error_message_buffer_placeholder
     [sizeof(ErrorMessageBuffer)];
 static ErrorMessageBuffer *error_message_buffer = nullptr;
 static Mutex error_message_buf_mutex;

compiler-rt/lib/asan/asan_suppressions.cpp

@@ -20,7 +20,7 @@
 
 namespace __asan {
 
-ALIGNED(64) static char suppression_placeholder[sizeof(SuppressionContext)];
+alignas(64) static char suppression_placeholder[sizeof(SuppressionContext)];
 static SuppressionContext *suppression_ctx = nullptr;
 static const char kInterceptorName[] = "interceptor_name";
 static const char kInterceptorViaFunction[] = "interceptor_via_fun";

compiler-rt/lib/asan/asan_thread.cpp

@@ -67,10 +67,10 @@ static void InitThreads() {
   // thread before all TSD destructors will be called for it.
 
   // MIPS requires aligned address
-  static ALIGNED(alignof(
-      ThreadRegistry)) char thread_registry_placeholder[sizeof(ThreadRegistry)];
-  static ALIGNED(alignof(
-      ThreadArgRetval)) char thread_data_placeholder[sizeof(ThreadArgRetval)];
+  alignas(alignof(ThreadRegistry)) static char
+      thread_registry_placeholder[sizeof(ThreadRegistry)];
+  alignas(alignof(ThreadArgRetval)) static char
+      thread_data_placeholder[sizeof(ThreadArgRetval)];
 
   asan_thread_registry =
       new (thread_registry_placeholder) ThreadRegistry(GetAsanThreadContext);

compiler-rt/lib/dfsan/dfsan_allocator.h

@@ -18,7 +18,7 @@
 namespace __dfsan {
 
 struct DFsanThreadLocalMallocStorage {
-  ALIGNED(8) uptr allocator_cache[96 * (512 * 8 + 16)];  // Opaque.
+  alignas(8) uptr allocator_cache[96 * (512 * 8 + 16)];  // Opaque.
   void CommitBack();
 
  private:

compiler-rt/lib/hwasan/hwasan_allocator.cpp

@@ -44,7 +44,7 @@ enum {
 
 
 // Initialized in HwasanAllocatorInit, an never changed.
-static ALIGNED(16) u8 tail_magic[kShadowAlignment - 1];
+alignas(16) static u8 tail_magic[kShadowAlignment - 1];
 static uptr max_malloc_size;
 
 bool HwasanChunkView::IsAllocated() const {

compiler-rt/lib/hwasan/hwasan_thread_list.cpp

@@ -14,15 +14,15 @@ ThreadArgRetval &hwasanThreadArgRetval() { return *thread_data; }
 void InitThreadList(uptr storage, uptr size) {
   CHECK_EQ(hwasan_thread_list, nullptr);
 
-  static ALIGNED(alignof(
-      HwasanThreadList)) char thread_list_placeholder[sizeof(HwasanThreadList)];
+  alignas(alignof(HwasanThreadList)) static char
+      thread_list_placeholder[sizeof(HwasanThreadList)];
   hwasan_thread_list =
       new (thread_list_placeholder) HwasanThreadList(storage, size);
 
   CHECK_EQ(thread_data, nullptr);
 
-  static ALIGNED(alignof(
-      ThreadArgRetval)) char thread_data_placeholder[sizeof(ThreadArgRetval)];
+  alignas(alignof(ThreadArgRetval)) static char
+      thread_data_placeholder[sizeof(ThreadArgRetval)];
   thread_data = new (thread_data_placeholder) ThreadArgRetval();
 }
 

compiler-rt/lib/lsan/lsan_common.cpp

@@ -108,7 +108,7 @@ class LeakSuppressionContext {
   void PrintMatchedSuppressions();
 };
 
-ALIGNED(64) static char suppression_placeholder[sizeof(LeakSuppressionContext)];
+alignas(64) static char suppression_placeholder[sizeof(LeakSuppressionContext)];
 static LeakSuppressionContext *suppression_ctx = nullptr;
 static const char kSuppressionLeak[] = "leak";
 static const char *kSuppressionTypes[] = {kSuppressionLeak};

compiler-rt/lib/lsan/lsan_common_linux.cpp

@@ -28,7 +28,7 @@ namespace __lsan {
 
 static const char kLinkerName[] = "ld";
 
-static char linker_placeholder[sizeof(LoadedModule)] ALIGNED(64);
+alignas(64) static char linker_placeholder[sizeof(LoadedModule)];
 static LoadedModule *linker = nullptr;
 
 static bool IsLinker(const LoadedModule& module) {