Change 64 bit ArtMethod fields to be pointer sized
Changed the 64 bit entrypoint and gc map fields in ArtMethod to be
pointer sized. This saves a large amount of memory on 32 bit systems.
Reduces ArtMethod size by 16 bytes on 32 bit.
Total number of ArtMethod on low memory mako: 169957
Image size: 49203 methods -> 787248 image size reduction.
Zygote space size: 1070 methods -> 17120 size reduction.
App methods: ~120k -> 2 MB savings.
Savings per app on low memory mako: 125K+ per app
(less active apps -> more image methods per app).
Savings depend on how often the shared methods are on dirty pages vs
shared.
TODO in another CL, delete gc map field from ArtMethod since we
should be able to get it from the Oat method header.
Bug: 17643507
Change-Id: Ie9508f05907a9f693882d4d32a564460bf273ee8
(cherry picked from commit e832e64a7e82d7f72aedbd7d798fb929d458ee8f)
diff --git a/runtime/mirror/object.h b/runtime/mirror/object.h
index 0ce5231..221feca 100644
--- a/runtime/mirror/object.h
+++ b/runtime/mirror/object.h
@@ -392,15 +392,26 @@
VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, typename T>
void SetFieldPtr(MemberOffset field_offset, T new_value)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
-#ifndef __LP64__
- SetField32<kTransactionActive, kCheckTransaction, kVerifyFlags>(
- field_offset, reinterpret_cast<int32_t>(new_value));
-#else
- SetField64<kTransactionActive, kCheckTransaction, kVerifyFlags>(
- field_offset, reinterpret_cast<int64_t>(new_value));
-#endif
+ SetFieldPtrWithSize<kTransactionActive, kCheckTransaction, kVerifyFlags>(
+ field_offset, new_value, sizeof(void*));
}
+ template<bool kTransactionActive, bool kCheckTransaction = true,
+ VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, typename T>
+ ALWAYS_INLINE void SetFieldPtrWithSize(MemberOffset field_offset, T new_value,
+ size_t pointer_size)
+ SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+ DCHECK(pointer_size == 4 || pointer_size == 8) << pointer_size;
+ if (pointer_size == 4) {
+ intptr_t ptr = reinterpret_cast<intptr_t>(new_value);
+ DCHECK_EQ(static_cast<int32_t>(ptr), ptr); // Check that we dont lose any non 0 bits.
+ SetField32<kTransactionActive, kCheckTransaction, kVerifyFlags>(
+ field_offset, static_cast<int32_t>(ptr));
+ } else {
+ SetField64<kTransactionActive, kCheckTransaction, kVerifyFlags>(
+ field_offset, static_cast<int64_t>(reinterpret_cast<intptr_t>(new_value)));
+ }
+ }
// TODO fix thread safety analysis broken by the use of template. This should be
// SHARED_LOCKS_REQUIRED(Locks::mutator_lock_).
template <const bool kVisitClass, VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags,
@@ -413,11 +424,21 @@
template<class T, VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, bool kIsVolatile = false>
T GetFieldPtr(MemberOffset field_offset)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
-#ifndef __LP64__
- return reinterpret_cast<T>(GetField32<kVerifyFlags, kIsVolatile>(field_offset));
-#else
- return reinterpret_cast<T>(GetField64<kVerifyFlags, kIsVolatile>(field_offset));
-#endif
+ return GetFieldPtrWithSize<T, kVerifyFlags, kIsVolatile>(field_offset, sizeof(void*));
+ }
+
+ template<class T, VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, bool kIsVolatile = false>
+ ALWAYS_INLINE T GetFieldPtrWithSize(MemberOffset field_offset, size_t pointer_size)
+ SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+ DCHECK(pointer_size == 4 || pointer_size == 8) << pointer_size;
+ if (pointer_size == 4) {
+ return reinterpret_cast<T>(GetField32<kVerifyFlags, kIsVolatile>(field_offset));
+ } else {
+ int64_t v = GetField64<kVerifyFlags, kIsVolatile>(field_offset);
+ // Check that we dont lose any non 0 bits.
+ DCHECK_EQ(reinterpret_cast<int64_t>(reinterpret_cast<T>(v)), v);
+ return reinterpret_cast<T>(v);
+ }
}
// TODO: Fixme when anotatalysis works with visitors.