Mercurial > hg > truffle
diff src/share/vm/opto/library_call.cpp @ 7425:1e41b0bc58a0
8004318: JEP-171: Support Unsafe fences intrinsics
Summary: Add three memory-ordering intrinsics to the sun.misc.Unsafe class.
Reviewed-by: twisti, kvn
Contributed-by: Aleksey Shipilev <aleksey.shipilev@oracle.com>
author | kvn |
---|---|
date | Tue, 18 Dec 2012 17:37:44 -0800 |
parents | 620e502e3f47 |
children | c52660592f37 |
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--- a/src/share/vm/opto/library_call.cpp Tue Dec 18 10:47:23 2012 -0800 +++ b/src/share/vm/opto/library_call.cpp Tue Dec 18 17:37:44 2012 -0800 @@ -282,6 +282,7 @@ typedef enum { LS_xadd, LS_xchg, LS_cmpxchg } LoadStoreKind; bool inline_unsafe_load_store(BasicType type, LoadStoreKind kind); bool inline_unsafe_ordered_store(BasicType type); + bool inline_unsafe_fence(vmIntrinsics::ID id); bool inline_fp_conversions(vmIntrinsics::ID id); bool inline_number_methods(vmIntrinsics::ID id); bool inline_reference_get(); @@ -334,6 +335,9 @@ case vmIntrinsics::_getAndSetInt: case vmIntrinsics::_getAndSetLong: case vmIntrinsics::_getAndSetObject: + case vmIntrinsics::_loadFence: + case vmIntrinsics::_storeFence: + case vmIntrinsics::_fullFence: break; // InlineNatives does not control String.compareTo case vmIntrinsics::_Reference_get: break; // InlineNatives does not control Reference.get @@ -732,6 +736,10 @@ case vmIntrinsics::_getAndSetLong: return inline_unsafe_load_store(T_LONG, LS_xchg); case vmIntrinsics::_getAndSetObject: return inline_unsafe_load_store(T_OBJECT, LS_xchg); + case vmIntrinsics::_loadFence: + case vmIntrinsics::_storeFence: + case vmIntrinsics::_fullFence: return inline_unsafe_fence(intrinsic_id()); + case vmIntrinsics::_currentThread: return inline_native_currentThread(); case vmIntrinsics::_isInterrupted: return inline_native_isInterrupted(); @@ -2840,6 +2848,26 @@ return true; } +bool LibraryCallKit::inline_unsafe_fence(vmIntrinsics::ID id) { + // Regardless of form, don't allow previous ld/st to move down, + // then issue acquire, release, or volatile mem_bar. + insert_mem_bar(Op_MemBarCPUOrder); + switch(id) { + case vmIntrinsics::_loadFence: + insert_mem_bar(Op_MemBarAcquire); + return true; + case vmIntrinsics::_storeFence: + insert_mem_bar(Op_MemBarRelease); + return true; + case vmIntrinsics::_fullFence: + insert_mem_bar(Op_MemBarVolatile); + return true; + default: + fatal_unexpected_iid(id); + return false; + } +} + //----------------------------inline_unsafe_allocate--------------------------- // public native Object sun.mics.Unsafe.allocateInstance(Class<?> cls); bool LibraryCallKit::inline_unsafe_allocate() {