Updated PACKED to alignas for DexCachePair and TLS data structures

Some members are non-POD and not usable with PACKED
(packed-non-pod warning).

Bug: 324278047
Test: art/test/testrunner/testrunner.py --host --64 --optimizing -b
Change-Id: I09b44e0300fa9b354e3e5bbd3a40d50658ea7260

3 files changed, 6 insertions, 6 deletions

diff --git a/runtime/mirror/class.h b/runtime/mirror/class.h
index 642d675808..b69086c971 100644
--- a/runtime/mirror/class.h
+++ b/runtime/mirror/class.h
@@ -76,7 +76,7 @@ class DexCache;
 class Field;
 class IfTable;
 class Method;
-template <typename T> struct PACKED(8) DexCachePair;
+template <typename T> struct alignas(8) DexCachePair;
 
 // C++ mirror of java.lang.Class
 class EXPORT MANAGED Class final : public Object {
diff --git a/runtime/mirror/dex_cache.h b/runtime/mirror/dex_cache.h
index 921d8028e7..d93464759f 100644
--- a/runtime/mirror/dex_cache.h
+++ b/runtime/mirror/dex_cache.h
@@ -53,7 +53,7 @@ class DexCache;
 class MethodType;
 class String;
 
-template <typename T> struct PACKED(8) DexCachePair {
+template <typename T> struct alignas(8) DexCachePair {
   GcRoot<T> object;
   uint32_t index;
   // The array is initially [ {0,0}, {0,0}, {0,0} ... ]
@@ -90,7 +90,7 @@ template <typename T> struct PACKED(8) DexCachePair {
   T* GetObjectForIndex(uint32_t idx) REQUIRES_SHARED(Locks::mutator_lock_);
 };
 
-template <typename T> struct PACKED(2 * __SIZEOF_POINTER__) NativeDexCachePair {
+template <typename T> struct alignas(2 * __SIZEOF_POINTER__) NativeDexCachePair {
   T* object;
   size_t index;
   // This is similar to DexCachePair except that we're storing a native pointer
diff --git a/runtime/thread.h b/runtime/thread.h
index 5a9c55aa14..b1afac1345 100644
--- a/runtime/thread.h
+++ b/runtime/thread.h
@@ -1946,7 +1946,7 @@ class EXPORT Thread {
   // first if possible.
   /***********************************************************************************************/
 
-  struct PACKED(4) tls_32bit_sized_values {
+  struct alignas(4) tls_32bit_sized_values {
     // We have no control over the size of 'bool', but want our boolean fields
     // to be 4-byte quantities.
     using bool32_t = uint32_t;
@@ -2074,7 +2074,7 @@ class EXPORT Thread {
     uint32_t shared_method_hotness;
   } tls32_;
 
-  struct PACKED(8) tls_64bit_sized_values {
+  struct alignas(8) tls_64bit_sized_values {
     tls_64bit_sized_values() : trace_clock_base(0) {
     }
 
@@ -2084,7 +2084,7 @@ class EXPORT Thread {
     RuntimeStats stats;
   } tls64_;
 
-  struct PACKED(sizeof(void*)) tls_ptr_sized_values {
+  struct alignas(sizeof(void*)) tls_ptr_sized_values {
       tls_ptr_sized_values() : card_table(nullptr),
                                exception(nullptr),
                                stack_end(nullptr),