void G1UnsafeGetObjSATBBarrierStub::emit_code(LIR_Assembler* ce) { // At this point we know that offset == referent_offset. // // So we might have to emit: // if (src == null) goto continuation. // // and we definitely have to emit: // if (klass(src).reference_type == REF_NONE) goto continuation // if (!marking_active) goto continuation // if (pre_val == null) goto continuation // call pre_barrier(pre_val) // goto continuation // __ bind(_entry); assert(src()->is_register(), "sanity"); Register src_reg = src()->as_register(); if (gen_src_check()) { // The original src operand was not a constant. // Generate src == null? if (__ is_in_wdisp16_range(_continuation)) { __ br_null(src_reg, /*annul*/false, Assembler::pt, _continuation); } else { __ cmp(src_reg, G0); __ brx(Assembler::equal, false, Assembler::pt, _continuation); } __ delayed()->nop(); } // Generate src->_klass->_reference_type() == REF_NONE)? assert(tmp()->is_register(), "sanity"); Register tmp_reg = tmp()->as_register(); __ load_klass(src_reg, tmp_reg); Address ref_type_adr(tmp_reg, instanceKlass::reference_type_offset()); __ ldub(ref_type_adr, tmp_reg); // _reference_type field is of type ReferenceType (enum) assert(REF_NONE == 0, "check this code"); __ cmp_zero_and_br(Assembler::equal, tmp_reg, _continuation, /*annul*/false, Assembler::pt); __ delayed()->nop(); // Is marking active? assert(thread()->is_register(), "precondition"); Register thread_reg = thread()->as_pointer_register(); Address in_progress(thread_reg, in_bytes(JavaThread::satb_mark_queue_offset() + PtrQueue::byte_offset_of_active())); if (in_bytes(PtrQueue::byte_width_of_active()) == 4) { __ ld(in_progress, tmp_reg); } else { assert(in_bytes(PtrQueue::byte_width_of_active()) == 1, "Assumption"); __ ldsb(in_progress, tmp_reg); } __ cmp_zero_and_br(Assembler::equal, tmp_reg, _continuation, /*annul*/false, Assembler::pt); __ delayed()->nop(); // val == null? assert(val()->is_register(), "Precondition."); Register val_reg = val()->as_register(); if (__ is_in_wdisp16_range(_continuation)) { __ br_null(val_reg, /*annul*/false, Assembler::pt, _continuation); } else { __ cmp(val_reg, G0); __ brx(Assembler::equal, false, Assembler::pt, _continuation); } __ delayed()->nop(); __ call(Runtime1::entry_for(Runtime1::Runtime1::g1_pre_barrier_slow_id)); __ delayed()->mov(val_reg, G4); __ br(Assembler::always, false, Assembler::pt, _continuation); __ delayed()->nop(); }
inline void MacroAssembler::ldsb(Register s1, RegisterOrConstant s2, Register d) { ldsb(Address(s1, s2), d); }
address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) { const char *name; switch (type) { case T_BOOLEAN: name = "jni_fast_GetBooleanField"; break; case T_BYTE: name = "jni_fast_GetByteField"; break; case T_CHAR: name = "jni_fast_GetCharField"; break; case T_SHORT: name = "jni_fast_GetShortField"; break; case T_INT: name = "jni_fast_GetIntField"; break; default: ShouldNotReachHere(); } ResourceMark rm; BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize); CodeBuffer cbuf(blob); MacroAssembler* masm = new MacroAssembler(&cbuf); address fast_entry = __ pc(); Label label1, label2; AddressLiteral cnt_addrlit(SafepointSynchronize::safepoint_counter_addr()); __ sethi (cnt_addrlit, O3); Address cnt_addr(O3, cnt_addrlit.low10()); __ ld (cnt_addr, G4); __ andcc (G4, 1, G0); __ br (Assembler::notZero, false, Assembler::pn, label1); __ delayed()->srl (O2, 2, O4); __ ld_ptr (O1, 0, O5); assert(count < LIST_CAPACITY, "LIST_CAPACITY too small"); speculative_load_pclist[count] = __ pc(); switch (type) { case T_BOOLEAN: __ ldub (O5, O4, G3); break; case T_BYTE: __ ldsb (O5, O4, G3); break; case T_CHAR: __ lduh (O5, O4, G3); break; case T_SHORT: __ ldsh (O5, O4, G3); break; case T_INT: __ ld (O5, O4, G3); break; default: ShouldNotReachHere(); } __ ld (cnt_addr, O5); __ cmp (O5, G4); __ br (Assembler::notEqual, false, Assembler::pn, label2); __ delayed()->mov (O7, G1); __ retl (); __ delayed()->mov (G3, O0); slowcase_entry_pclist[count++] = __ pc(); __ bind (label1); __ mov (O7, G1); address slow_case_addr; switch (type) { case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break; case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break; case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break; case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break; case T_INT: slow_case_addr = jni_GetIntField_addr(); break; default: ShouldNotReachHere(); } __ bind (label2); __ call (slow_case_addr, relocInfo::none); __ delayed()->mov (G1, O7); __ flush (); return fast_entry; }
inline void MacroAssembler::ldsb(const Address& a, Register d, int offset) { if (a.has_index()) { assert(offset == 0, ""); ldsb(a.base(), a.index(), d); } else { ldsb(a.base(), a.disp() + offset, d); } }