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src/hotspot/cpu/s390/gc/g1/g1BarrierSetAssembler_s390.cpp
BarrierSetC1
*/
#include "precompiled.hpp"
#include "asm/macroAssembler.inline.hpp"
#include "registerSaver_s390.hpp"
+ #include "c1/c1_LIRAssembler.hpp"
+ #include "c1/c1_MacroAssembler.hpp"
+ #include "gc/g1/c1/g1BarrierSetC1.hpp"
#include "gc/g1/g1CardTable.hpp"
#include "gc/g1/g1BarrierSet.hpp"
#include "gc/g1/g1BarrierSetAssembler.hpp"
#include "gc/g1/g1ThreadLocalData.hpp"
#include "gc/g1/heapRegion.hpp"
***************
__ verify_oop(value);
__ bind(Ldone);
}
#undef __
+ #define __ ce->masm()->
+
+ void G1BarrierSetAssembler::gen_g1_pre_barrier_stub(LIR_Assembler* ce, G1PreBarrierStub* stub) {
+ G1BarrierSetC1* bs = (G1BarrierSetC1*)BarrierSet::barrier_set()->barrier_set_c1();
+ // At this point we know that marking is in progress.
+ // If do_load() is true then we have to emit the
+ // load of the previous value; otherwise it has already
+ // been loaded into _pre_val.
+ __ bind(*stub->entry());
+ ce->check_reserved_argument_area(16); // RT stub needs 2 spill slots.
+ assert(stub->pre_val()->is_register(), "Precondition.");
+
+ Register pre_val_reg = stub->pre_val()->as_register();
+
+ if (stub->do_load()) {
+ ce->mem2reg(stub->addr(), stub->pre_val(), T_OBJECT, stub->patch_code(), stub->info(), false /*wide*/, false /*unaligned*/);
+ }
+
+ __ z_ltgr(Z_R1_scratch, pre_val_reg); // Pass oop in Z_R1_scratch to Runtime1::g1_pre_barrier_slow_id.
+ __ branch_optimized(Assembler::bcondZero, *stub->continuation());
+ ce->emit_call_c(bs->pre_barrier_c1_runtime_code_blob()->code_begin());
+ __ branch_optimized(Assembler::bcondAlways, *stub->continuation());
+ }
+
+ void G1BarrierSetAssembler::gen_g1_post_barrier_stub(LIR_Assembler* ce, G1PostBarrierStub* stub) {
+ G1BarrierSetC1* bs = (G1BarrierSetC1*)BarrierSet::barrier_set()->barrier_set_c1();
+ __ bind(*stub->entry());
+ ce->check_reserved_argument_area(16); // RT stub needs 2 spill slots.
+ assert(stub->addr()->is_register(), "Precondition.");
+ assert(stub->new_val()->is_register(), "Precondition.");
+ Register new_val_reg = stub->new_val()->as_register();
+ __ z_ltgr(new_val_reg, new_val_reg);
+ __ branch_optimized(Assembler::bcondZero, *stub->continuation());
+ __ z_lgr(Z_R1_scratch, stub->addr()->as_pointer_register());
+ ce->emit_call_c(bs->post_barrier_c1_runtime_code_blob()->code_begin());
+ __ branch_optimized(Assembler::bcondAlways, *stub->continuation());
+ }
+
+ #undef __
+
+ #define __ sasm->
+
+ static OopMap* save_volatile_registers(StubAssembler* sasm, Register return_pc = Z_R14) {
+ __ block_comment("save_volatile_registers");
+ RegisterSaver::RegisterSet reg_set = RegisterSaver::all_volatile_registers;
+ int frame_size_in_slots = RegisterSaver::live_reg_frame_size(reg_set) / VMRegImpl::stack_slot_size;
+ sasm->set_frame_size(frame_size_in_slots / VMRegImpl::slots_per_word);
+ return RegisterSaver::save_live_registers(sasm, reg_set, return_pc);
+ }
+
+ static void restore_volatile_registers(StubAssembler* sasm) {
+ __ block_comment("restore_volatile_registers");
+ RegisterSaver::RegisterSet reg_set = RegisterSaver::all_volatile_registers;
+ RegisterSaver::restore_live_registers(sasm, reg_set);
+ }
+
+ void G1BarrierSetAssembler::generate_c1_pre_barrier_runtime_stub(StubAssembler* sasm) {
+ // Z_R1_scratch: previous value of memory
+
+ BarrierSet* bs = BarrierSet::barrier_set();
+ __ set_info("g1_pre_barrier_slow_id", false);
+
+ Register pre_val = Z_R1_scratch;
+ Register tmp = Z_R6; // Must be non-volatile because it is used to save pre_val.
+ Register tmp2 = Z_R7;
+
+ Label refill, restart, marking_not_active;
+ int satb_q_active_byte_offset = in_bytes(G1ThreadLocalData::satb_mark_queue_active_offset());
+ int satb_q_index_byte_offset = in_bytes(G1ThreadLocalData::satb_mark_queue_index_offset());
+ int satb_q_buf_byte_offset = in_bytes(G1ThreadLocalData::satb_mark_queue_buffer_offset());
+
+ // Save tmp registers (see assertion in G1PreBarrierStub::emit_code()).
+ __ z_stg(tmp, 0*BytesPerWord + FrameMap::first_available_sp_in_frame, Z_SP);
+ __ z_stg(tmp2, 1*BytesPerWord + FrameMap::first_available_sp_in_frame, Z_SP);
+
+ // Is marking still active?
+ if (in_bytes(SATBMarkQueue::byte_width_of_active()) == 4) {
+ __ load_and_test_int(tmp, Address(Z_thread, satb_q_active_byte_offset));
+ } else {
+ assert(in_bytes(SATBMarkQueue::byte_width_of_active()) == 1, "Assumption");
+ __ load_and_test_byte(tmp, Address(Z_thread, satb_q_active_byte_offset));
+ }
+ __ z_bre(marking_not_active); // Activity indicator is zero, so there is no marking going on currently.
+
+ __ bind(restart);
+ // Load the index into the SATB buffer. SATBMarkQueue::_index is a
+ // size_t so ld_ptr is appropriate.
+ __ z_ltg(tmp, satb_q_index_byte_offset, Z_R0, Z_thread);
+
+ // index == 0?
+ __ z_brz(refill);
+
+ __ z_lg(tmp2, satb_q_buf_byte_offset, Z_thread);
+ __ add2reg(tmp, -oopSize);
+
+ __ z_stg(pre_val, 0, tmp, tmp2); // [_buf + index] := <address_of_card>
+ __ z_stg(tmp, satb_q_index_byte_offset, Z_thread);
+
+ __ bind(marking_not_active);
+ // Restore tmp registers (see assertion in G1PreBarrierStub::emit_code()).
+ __ z_lg(tmp, 0*BytesPerWord + FrameMap::first_available_sp_in_frame, Z_SP);
+ __ z_lg(tmp2, 1*BytesPerWord + FrameMap::first_available_sp_in_frame, Z_SP);
+ __ z_br(Z_R14);
+
+ __ bind(refill);
+ save_volatile_registers(sasm);
+ __ z_lgr(tmp, pre_val); // save pre_val
+ __ call_VM_leaf(CAST_FROM_FN_PTR(address, SATBMarkQueueSet::handle_zero_index_for_thread),
+ Z_thread);
+ __ z_lgr(pre_val, tmp); // restore pre_val
+ restore_volatile_registers(sasm);
+ __ z_bru(restart);
+ }
+
+ void G1BarrierSetAssembler::generate_c1_post_barrier_runtime_stub(StubAssembler* sasm) {
+ // Z_R1_scratch: oop address, address of updated memory slot
+
+ BarrierSet* bs = BarrierSet::barrier_set();
+ __ set_info("g1_post_barrier_slow_id", false);
+
+ Register addr_oop = Z_R1_scratch;
+ Register addr_card = Z_R1_scratch;
+ Register r1 = Z_R6; // Must be saved/restored.
+ Register r2 = Z_R7; // Must be saved/restored.
+ Register cardtable = r1; // Must be non-volatile, because it is used to save addr_card.
+ CardTableBarrierSet* ctbs = barrier_set_cast<CardTableBarrierSet>(bs);
+ CardTable* ct = ctbs->card_table();
+ jbyte* byte_map_base = ct->byte_map_base();
+
+ // Save registers used below (see assertion in G1PreBarrierStub::emit_code()).
+ __ z_stg(r1, 0*BytesPerWord + FrameMap::first_available_sp_in_frame, Z_SP);
+
+ Label not_already_dirty, restart, refill, young_card;
+
+ // Calculate address of card corresponding to the updated oop slot.
+ AddressLiteral rs(byte_map_base);
+ __ z_srlg(addr_card, addr_oop, CardTable::card_shift);
+ addr_oop = noreg; // dead now
+ __ load_const_optimized(cardtable, rs); // cardtable := <card table base>
+ __ z_agr(addr_card, cardtable); // addr_card := addr_oop>>card_shift + cardtable
+
+ __ z_cli(0, addr_card, (int)G1CardTable::g1_young_card_val());
+ __ z_bre(young_card);
+
+ __ z_sync(); // Required to support concurrent cleaning.
+
+ __ z_cli(0, addr_card, (int)CardTable::dirty_card_val());
+ __ z_brne(not_already_dirty);
+
+ __ bind(young_card);
+ // We didn't take the branch, so we're already dirty: restore
+ // used registers and return.
+ __ z_lg(r1, 0*BytesPerWord + FrameMap::first_available_sp_in_frame, Z_SP);
+ __ z_br(Z_R14);
+
+ // Not dirty.
+ __ bind(not_already_dirty);
+
+ // First, dirty it: [addr_card] := 0
+ __ z_mvi(0, addr_card, CardTable::dirty_card_val());
+
+ Register idx = cardtable; // Must be non-volatile, because it is used to save addr_card.
+ Register buf = r2;
+ cardtable = noreg; // now dead
+
+ // Save registers used below (see assertion in G1PreBarrierStub::emit_code()).
+ __ z_stg(r2, 1*BytesPerWord + FrameMap::first_available_sp_in_frame, Z_SP);
+
+ ByteSize dirty_card_q_index_byte_offset = G1ThreadLocalData::dirty_card_queue_index_offset();
+ ByteSize dirty_card_q_buf_byte_offset = G1ThreadLocalData::dirty_card_queue_buffer_offset();
+
+ __ bind(restart);
+
+ // Get the index into the update buffer. DirtyCardQueue::_index is
+ // a size_t so z_ltg is appropriate here.
+ __ z_ltg(idx, Address(Z_thread, dirty_card_q_index_byte_offset));
+
+ // index == 0?
+ __ z_brz(refill);
+
+ __ z_lg(buf, Address(Z_thread, dirty_card_q_buf_byte_offset));
+ __ add2reg(idx, -oopSize);
+
+ __ z_stg(addr_card, 0, idx, buf); // [_buf + index] := <address_of_card>
+ __ z_stg(idx, Address(Z_thread, dirty_card_q_index_byte_offset));
+ // Restore killed registers and return.
+ __ z_lg(r1, 0*BytesPerWord + FrameMap::first_available_sp_in_frame, Z_SP);
+ __ z_lg(r2, 1*BytesPerWord + FrameMap::first_available_sp_in_frame, Z_SP);
+ __ z_br(Z_R14);
+
+ __ bind(refill);
+ save_volatile_registers(sasm);
+ __ z_lgr(idx, addr_card); // Save addr_card, tmp3 must be non-volatile.
+ __ call_VM_leaf(CAST_FROM_FN_PTR(address, DirtyCardQueueSet::handle_zero_index_for_thread),
+ Z_thread);
+ __ z_lgr(addr_card, idx);
+ restore_volatile_registers(sasm); // Restore addr_card.
+ __ z_bru(restart);
+ }
+
+ #undef __
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