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comparison src/cpu/x86/vm/assembler_x86_64.cpp @ 167:feeb96a45707

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6696264: assert("narrow oop can never be zero") for GCBasher & ParNewGC Summary: decouple set_klass() with zeroing the gap when compressed. Reviewed-by: kvn, ysr, jrose
author coleenp
date Wed, 28 May 2008 21:06:24 -0700
parents c436414a719e
children 1f809e010142 44abbb0d4c18
comparison
equal deleted inserted replaced
166:aaa1137c5ef4 167:feeb96a45707
4933 addq(t1, (int)ThreadLocalAllocBuffer::alignment_reserve()); 4933 addq(t1, (int)ThreadLocalAllocBuffer::alignment_reserve());
4934 shlq(t1, log2_intptr(HeapWordSize / sizeof(jint))); 4934 shlq(t1, log2_intptr(HeapWordSize / sizeof(jint)));
4935 movq(Address(top, arrayOopDesc::length_offset_in_bytes()), t1); 4935 movq(Address(top, arrayOopDesc::length_offset_in_bytes()), t1);
4936 // set klass to intArrayKlass 4936 // set klass to intArrayKlass
4937 movptr(t1, ExternalAddress((address) Universe::intArrayKlassObj_addr())); 4937 movptr(t1, ExternalAddress((address) Universe::intArrayKlassObj_addr()));
4938 // store klass last. concurrent gcs assumes klass length is valid if
4939 // klass field is not null.
4938 store_klass(top, t1); 4940 store_klass(top, t1);
4939 4941
4940 // refill the tlab with an eden allocation 4942 // refill the tlab with an eden allocation
4941 bind(do_refill); 4943 bind(do_refill);
4942 movq(t1, Address(thread_reg, in_bytes(JavaThread::tlab_size_offset()))); 4944 movq(t1, Address(thread_reg, in_bytes(JavaThread::tlab_size_offset())));
5157 } 5159 }
5158 5160
5159 void MacroAssembler::store_klass(Register dst, Register src) { 5161 void MacroAssembler::store_klass(Register dst, Register src) {
5160 if (UseCompressedOops) { 5162 if (UseCompressedOops) {
5161 encode_heap_oop_not_null(src); 5163 encode_heap_oop_not_null(src);
5162 // Store to the wide klass field to zero the gap. 5164 movl(Address(dst, oopDesc::klass_offset_in_bytes()), src);
5163 } 5165 } else {
5164 movq(Address(dst, oopDesc::klass_offset_in_bytes()), src); 5166 movq(Address(dst, oopDesc::klass_offset_in_bytes()), src);
5167 }
5168 }
5169
5170 void MacroAssembler::store_klass_gap(Register dst, Register src) {
5171 if (UseCompressedOops) {
5172 // Store to klass gap in destination
5173 movl(Address(dst, oopDesc::klass_gap_offset_in_bytes()), src);
5174 }
5165 } 5175 }
5166 5176
5167 void MacroAssembler::load_heap_oop(Register dst, Address src) { 5177 void MacroAssembler::load_heap_oop(Register dst, Address src) {
5168 if (UseCompressedOops) { 5178 if (UseCompressedOops) {
5169 movl(dst, src); 5179 movl(dst, src);