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comparison src/share/vm/oops/typeArrayKlass.cpp @ 3961:a92cdbac8b9e

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7081933: Use zeroing elimination optimization for large array Summary: Don't zero new typeArray during runtime call if the allocation is followed by arraycopy into it. Reviewed-by: twisti
author kvn
date Mon, 26 Sep 2011 10:24:05 -0700
parents c9ca3f51cf41
children a735aec54ea4
comparison
equal deleted inserted replaced
3960:f08d439fab8c 3961:a92cdbac8b9e
74 complete_create_array_klass(k, super, CHECK_NULL); 74 complete_create_array_klass(k, super, CHECK_NULL);
75 75
76 return k(); 76 return k();
77 } 77 }
78 78
79 typeArrayOop typeArrayKlass::allocate(int length, TRAPS) { 79 typeArrayOop typeArrayKlass::allocate_common(int length, bool do_zero, TRAPS) {
80 assert(log2_element_size() >= 0, "bad scale"); 80 assert(log2_element_size() >= 0, "bad scale");
81 if (length >= 0) { 81 if (length >= 0) {
82 if (length <= max_length()) { 82 if (length <= max_length()) {
83 size_t size = typeArrayOopDesc::object_size(layout_helper(), length); 83 size_t size = typeArrayOopDesc::object_size(layout_helper(), length);
84 KlassHandle h_k(THREAD, as_klassOop()); 84 KlassHandle h_k(THREAD, as_klassOop());
85 typeArrayOop t; 85 typeArrayOop t;
86 CollectedHeap* ch = Universe::heap(); 86 CollectedHeap* ch = Universe::heap();
87 t = (typeArrayOop)CollectedHeap::array_allocate(h_k, (int)size, length, CHECK_NULL); 87 if (do_zero) {
88 t = (typeArrayOop)CollectedHeap::array_allocate(h_k, (int)size, length, CHECK_NULL);
89 } else {
90 t = (typeArrayOop)CollectedHeap::array_allocate_nozero(h_k, (int)size, length, CHECK_NULL);
91 }
88 assert(t->is_parsable(), "Don't publish unless parsable"); 92 assert(t->is_parsable(), "Don't publish unless parsable");
89 return t; 93 return t;
90 } else { 94 } else {
91 report_java_out_of_memory("Requested array size exceeds VM limit"); 95 report_java_out_of_memory("Requested array size exceeds VM limit");
92 THROW_OOP_0(Universe::out_of_memory_error_array_size()); 96 THROW_OOP_0(Universe::out_of_memory_error_array_size());