src/share/vm/prims/unsafe.cpp
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*** old/src/share/vm/prims/unsafe.cpp	Fri Feb  5 13:28:06 2016
--- new/src/share/vm/prims/unsafe.cpp	Fri Feb  5 13:28:06 2016

*** 662,731 **** --- 662,697 ---- // This function is a leaf since if the source and destination are both in native memory // the copy may potentially be very large, and we don't want to disable GC if we can avoid it. // If either source or destination (or both) are on the heap, the function will enter VM using // JVM_ENTRY_FROM_LEAF ! JVM_LEAF(void, Unsafe_CopySwapMemory0(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size, jlong elemSize)) { ! UnsafeWrapper("Unsafe_CopySwapMemory0"); if (size == 0) { return; } size_t sz = (size_t)size; if (sz != (julong)size || size < 0) { JVM_ENTRY_FROM_LEAF(env, void, Unsafe_CopySwapMemory) { THROW(vmSymbols::java_lang_IllegalArgumentException()); } JVM_END } size_t esz = (size_t)elemSize; if (esz != 2 && esz != 4 && esz != 8) { JVM_ENTRY_FROM_LEAF(env, void, Unsafe_CopySwapMemory) { THROW(vmSymbols::java_lang_IllegalArgumentException()); } JVM_END } if (!is_size_aligned(sz, esz)) { JVM_ENTRY_FROM_LEAF(env, void, Unsafe_CopySwapMemory) { THROW(vmSymbols::java_lang_IllegalArgumentException()); } JVM_END } if (srcObj == NULL && dstObj == NULL) { // Both src & dst are in native memory address src = (address)srcOffset; address dst = (address)dstOffset; if (src == NULL || dst == NULL) { JVM_ENTRY_FROM_LEAF(env, void, Unsafe_CopySwapMemory) { THROW(vmSymbols::java_lang_NullPointerException()); } JVM_END } Copy::conjoint_swap(src, dst, sz, esz); } else { // At least one of src/dst are on heap, transition to VM to access raw pointers ! JVM_ENTRY_FROM_LEAF(env, void, Unsafe_CopySwapMemory0) { oop srcp = JNIHandles::resolve(srcObj); oop dstp = JNIHandles::resolve(dstObj); if (dstp != NULL && !dstp->is_typeArray()) { // NYI: This works only for non-oop arrays at present. // Generalizing it would be reasonable, but requires card marking. // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad. THROW(vmSymbols::java_lang_IllegalArgumentException()); } address src = (address)index_oop_from_field_offset_long(srcp, srcOffset); address dst = (address)index_oop_from_field_offset_long(dstp, dstOffset); Copy::conjoint_swap(src, dst, sz, esz); } JVM_END } ! } JVM_END ////// Random queries // See comment at file start about UNSAFE_LEAF //UNSAFE_LEAF(jint, Unsafe_AddressSize())
*** 1425,1435 **** --- 1391,1401 ---- {CC "unpark", CC "(" OBJ ")V", FN_PTR(Unsafe_Unpark)}, {CC "getLoadAverage", CC "([DI)I", FN_PTR(Unsafe_Loadavg)}, {CC "copyMemory", CC "(" OBJ "J" OBJ "JJ)V", FN_PTR(Unsafe_CopyMemory)}, ! {CC "copySwapMemory", CC "(" OBJ "J" OBJ "JJJ)V", FN_PTR(Unsafe_CopySwapMemory)}, ! {CC "copySwapMemory0", CC "(" OBJ "J" OBJ "JJJ)V", FN_PTR(Unsafe_CopySwapMemory0)}, {CC "setMemory", CC "(" OBJ "JJB)V", FN_PTR(Unsafe_SetMemory)}, {CC "defineAnonymousClass", CC "(" DAC_Args ")" CLS, FN_PTR(Unsafe_DefineAnonymousClass)}, {CC "shouldBeInitialized",CC "(" CLS ")Z", FN_PTR(Unsafe_ShouldBeInitialized)},

src/share/vm/prims/unsafe.cpp
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