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g1BarrierSetAssembler_ppc.cpp
600 lines (499 loc) · 22.9 KB
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g1BarrierSetAssembler_ppc.cpp
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/*
* Copyright (c) 2018, 2021, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2018, 2021 SAP SE. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "asm/macroAssembler.inline.hpp"
#include "gc/g1/g1BarrierSet.hpp"
#include "gc/g1/g1BarrierSetAssembler.hpp"
#include "gc/g1/g1BarrierSetRuntime.hpp"
#include "gc/g1/g1CardTable.hpp"
#include "gc/g1/g1DirtyCardQueue.hpp"
#include "gc/g1/g1SATBMarkQueueSet.hpp"
#include "gc/g1/g1ThreadLocalData.hpp"
#include "gc/g1/heapRegion.hpp"
#include "interpreter/interp_masm.hpp"
#include "runtime/jniHandles.hpp"
#include "runtime/sharedRuntime.hpp"
#include "utilities/macros.hpp"
#ifdef COMPILER1
#include "c1/c1_LIRAssembler.hpp"
#include "c1/c1_MacroAssembler.hpp"
#include "gc/g1/c1/g1BarrierSetC1.hpp"
#endif
#define __ masm->
void G1BarrierSetAssembler::gen_write_ref_array_pre_barrier(MacroAssembler* masm, DecoratorSet decorators,
Register from, Register to, Register count,
Register preserve1, Register preserve2) {
bool dest_uninitialized = (decorators & IS_DEST_UNINITIALIZED) != 0;
// With G1, don't generate the call if we statically know that the target in uninitialized
if (!dest_uninitialized) {
int spill_slots = 3;
if (preserve1 != noreg) { spill_slots++; }
if (preserve2 != noreg) { spill_slots++; }
const int frame_size = align_up(frame::abi_reg_args_size + spill_slots * BytesPerWord, frame::alignment_in_bytes);
Label filtered;
// Is marking active?
if (in_bytes(SATBMarkQueue::byte_width_of_active()) == 4) {
__ lwz(R0, in_bytes(G1ThreadLocalData::satb_mark_queue_active_offset()), R16_thread);
} else {
guarantee(in_bytes(SATBMarkQueue::byte_width_of_active()) == 1, "Assumption");
__ lbz(R0, in_bytes(G1ThreadLocalData::satb_mark_queue_active_offset()), R16_thread);
}
__ cmpdi(CCR0, R0, 0);
__ beq(CCR0, filtered);
__ save_LR_CR(R0);
__ push_frame(frame_size, R0);
int slot_nr = 0;
__ std(from, frame_size - (++slot_nr) * wordSize, R1_SP);
__ std(to, frame_size - (++slot_nr) * wordSize, R1_SP);
__ std(count, frame_size - (++slot_nr) * wordSize, R1_SP);
if (preserve1 != noreg) { __ std(preserve1, frame_size - (++slot_nr) * wordSize, R1_SP); }
if (preserve2 != noreg) { __ std(preserve2, frame_size - (++slot_nr) * wordSize, R1_SP); }
if (UseCompressedOops) {
__ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSetRuntime::write_ref_array_pre_narrow_oop_entry), to, count);
} else {
__ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSetRuntime::write_ref_array_pre_oop_entry), to, count);
}
slot_nr = 0;
__ ld(from, frame_size - (++slot_nr) * wordSize, R1_SP);
__ ld(to, frame_size - (++slot_nr) * wordSize, R1_SP);
__ ld(count, frame_size - (++slot_nr) * wordSize, R1_SP);
if (preserve1 != noreg) { __ ld(preserve1, frame_size - (++slot_nr) * wordSize, R1_SP); }
if (preserve2 != noreg) { __ ld(preserve2, frame_size - (++slot_nr) * wordSize, R1_SP); }
__ addi(R1_SP, R1_SP, frame_size); // pop_frame()
__ restore_LR_CR(R0);
__ bind(filtered);
}
}
void G1BarrierSetAssembler::gen_write_ref_array_post_barrier(MacroAssembler* masm, DecoratorSet decorators,
Register addr, Register count, Register preserve) {
int spill_slots = (preserve != noreg) ? 1 : 0;
const int frame_size = align_up(frame::abi_reg_args_size + spill_slots * BytesPerWord, frame::alignment_in_bytes);
__ save_LR_CR(R0);
__ push_frame(frame_size, R0);
if (preserve != noreg) { __ std(preserve, frame_size - 1 * wordSize, R1_SP); }
__ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSetRuntime::write_ref_array_post_entry), addr, count);
if (preserve != noreg) { __ ld(preserve, frame_size - 1 * wordSize, R1_SP); }
__ addi(R1_SP, R1_SP, frame_size); // pop_frame();
__ restore_LR_CR(R0);
}
void G1BarrierSetAssembler::g1_write_barrier_pre(MacroAssembler* masm, DecoratorSet decorators,
Register obj, RegisterOrConstant ind_or_offs, Register pre_val,
Register tmp1, Register tmp2,
MacroAssembler::PreservationLevel preservation_level) {
bool not_null = (decorators & IS_NOT_NULL) != 0,
preloaded = obj == noreg;
Register nv_save = noreg;
if (preloaded) {
// We are not loading the previous value so make
// sure that we don't trash the value in pre_val
// with the code below.
assert_different_registers(pre_val, tmp1, tmp2);
if (pre_val->is_volatile()) {
nv_save = !tmp1->is_volatile() ? tmp1 : tmp2;
assert(!nv_save->is_volatile(), "need one nv temp register if pre_val lives in volatile register");
}
}
Label runtime, filtered;
// Is marking active?
if (in_bytes(SATBMarkQueue::byte_width_of_active()) == 4) {
__ lwz(tmp1, in_bytes(G1ThreadLocalData::satb_mark_queue_active_offset()), R16_thread);
} else {
guarantee(in_bytes(SATBMarkQueue::byte_width_of_active()) == 1, "Assumption");
__ lbz(tmp1, in_bytes(G1ThreadLocalData::satb_mark_queue_active_offset()), R16_thread);
}
__ cmpdi(CCR0, tmp1, 0);
__ beq(CCR0, filtered);
// Do we need to load the previous value?
if (!preloaded) {
// Load the previous value...
if (UseCompressedOops) {
__ lwz(pre_val, ind_or_offs, obj);
} else {
__ ld(pre_val, ind_or_offs, obj);
}
// Previous value has been loaded into Rpre_val.
}
assert(pre_val != noreg, "must have a real register");
// Is the previous value null?
if (preloaded && not_null) {
#ifdef ASSERT
__ cmpdi(CCR0, pre_val, 0);
__ asm_assert_ne("null oop not allowed (G1 pre)"); // Checked by caller.
#endif
} else {
__ cmpdi(CCR0, pre_val, 0);
__ beq(CCR0, filtered);
}
if (!preloaded && UseCompressedOops) {
__ decode_heap_oop_not_null(pre_val);
}
// OK, it's not filtered, so we'll need to call enqueue. In the normal
// case, pre_val will be a scratch G-reg, but there are some cases in
// which it's an O-reg. In the first case, do a normal call. In the
// latter, do a save here and call the frameless version.
// Can we store original value in the thread's buffer?
// Is index == 0?
// (The index field is typed as size_t.)
const Register Rbuffer = tmp1, Rindex = tmp2;
__ ld(Rindex, in_bytes(G1ThreadLocalData::satb_mark_queue_index_offset()), R16_thread);
__ cmpdi(CCR0, Rindex, 0);
__ beq(CCR0, runtime); // If index == 0, goto runtime.
__ ld(Rbuffer, in_bytes(G1ThreadLocalData::satb_mark_queue_buffer_offset()), R16_thread);
__ addi(Rindex, Rindex, -wordSize); // Decrement index.
__ std(Rindex, in_bytes(G1ThreadLocalData::satb_mark_queue_index_offset()), R16_thread);
// Record the previous value.
__ stdx(pre_val, Rbuffer, Rindex);
__ b(filtered);
__ bind(runtime);
// Determine necessary runtime invocation preservation measures
const bool needs_frame = preservation_level >= MacroAssembler::PRESERVATION_FRAME_LR;
const bool preserve_gp_registers = preservation_level >= MacroAssembler::PRESERVATION_FRAME_LR_GP_REGS;
const bool preserve_fp_registers = preservation_level >= MacroAssembler::PRESERVATION_FRAME_LR_GP_FP_REGS;
int nbytes_save = 0;
// May need to preserve LR. Also needed if current frame is not compatible with C calling convention.
if (needs_frame) {
if (preserve_gp_registers) {
nbytes_save = (MacroAssembler::num_volatile_gp_regs
+ (preserve_fp_registers ? MacroAssembler::num_volatile_fp_regs : 0)
) * BytesPerWord;
__ save_volatile_gprs(R1_SP, -nbytes_save, preserve_fp_registers);
}
__ save_LR_CR(tmp1);
__ push_frame_reg_args(nbytes_save, tmp2);
}
if (pre_val->is_volatile() && preloaded && !preserve_gp_registers) {
__ mr(nv_save, pre_val); // Save pre_val across C call if it was preloaded.
}
__ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSetRuntime::write_ref_field_pre_entry), pre_val, R16_thread);
if (pre_val->is_volatile() && preloaded && !preserve_gp_registers) {
__ mr(pre_val, nv_save); // restore
}
if (needs_frame) {
__ pop_frame();
__ restore_LR_CR(tmp1);
if (preserve_gp_registers) {
__ restore_volatile_gprs(R1_SP, -nbytes_save, preserve_fp_registers);
}
}
__ bind(filtered);
}
void G1BarrierSetAssembler::g1_write_barrier_post(MacroAssembler* masm, DecoratorSet decorators,
Register store_addr, Register new_val,
Register tmp1, Register tmp2, Register tmp3,
MacroAssembler::PreservationLevel preservation_level) {
bool not_null = (decorators & IS_NOT_NULL) != 0;
Label runtime, filtered;
assert_different_registers(store_addr, new_val, tmp1, tmp2);
CardTableBarrierSet* ct = barrier_set_cast<CardTableBarrierSet>(BarrierSet::barrier_set());
// Does store cross heap regions?
__ xorr(tmp1, store_addr, new_val);
__ srdi_(tmp1, tmp1, HeapRegion::LogOfHRGrainBytes);
__ beq(CCR0, filtered);
// Crosses regions, storing NULL?
if (not_null) {
#ifdef ASSERT
__ cmpdi(CCR0, new_val, 0);
__ asm_assert_ne("null oop not allowed (G1 post)"); // Checked by caller.
#endif
} else {
__ cmpdi(CCR0, new_val, 0);
__ beq(CCR0, filtered);
}
// Storing region crossing non-NULL, is card already dirty?
const Register Rcard_addr = tmp1;
Register Rbase = tmp2;
__ load_const_optimized(Rbase, (address)(ct->card_table()->byte_map_base()), /*temp*/ tmp3);
__ srdi(Rcard_addr, store_addr, CardTable::card_shift());
// Get the address of the card.
__ lbzx(/*card value*/ tmp3, Rbase, Rcard_addr);
__ cmpwi(CCR0, tmp3, (int)G1CardTable::g1_young_card_val());
__ beq(CCR0, filtered);
__ membar(Assembler::StoreLoad);
__ lbzx(/*card value*/ tmp3, Rbase, Rcard_addr); // Reload after membar.
__ cmpwi(CCR0, tmp3 /* card value */, (int)G1CardTable::dirty_card_val());
__ beq(CCR0, filtered);
// Storing a region crossing, non-NULL oop, card is clean.
// Dirty card and log.
__ li(tmp3, (int)G1CardTable::dirty_card_val());
//release(); // G1: oops are allowed to get visible after dirty marking.
__ stbx(tmp3, Rbase, Rcard_addr);
__ add(Rcard_addr, Rbase, Rcard_addr); // This is the address which needs to get enqueued.
Rbase = noreg; // end of lifetime
const Register Rqueue_index = tmp2,
Rqueue_buf = tmp3;
__ ld(Rqueue_index, in_bytes(G1ThreadLocalData::dirty_card_queue_index_offset()), R16_thread);
__ cmpdi(CCR0, Rqueue_index, 0);
__ beq(CCR0, runtime); // index == 0 then jump to runtime
__ ld(Rqueue_buf, in_bytes(G1ThreadLocalData::dirty_card_queue_buffer_offset()), R16_thread);
__ addi(Rqueue_index, Rqueue_index, -wordSize); // decrement index
__ std(Rqueue_index, in_bytes(G1ThreadLocalData::dirty_card_queue_index_offset()), R16_thread);
__ stdx(Rcard_addr, Rqueue_buf, Rqueue_index); // store card
__ b(filtered);
__ bind(runtime);
assert(preservation_level == MacroAssembler::PRESERVATION_NONE,
"g1_write_barrier_post doesn't support preservation levels higher than PRESERVATION_NONE");
// Save the live input values.
__ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSetRuntime::write_ref_field_post_entry), Rcard_addr, R16_thread);
__ bind(filtered);
}
void G1BarrierSetAssembler::oop_store_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
Register base, RegisterOrConstant ind_or_offs, Register val,
Register tmp1, Register tmp2, Register tmp3,
MacroAssembler::PreservationLevel preservation_level) {
bool is_array = (decorators & IS_ARRAY) != 0;
bool on_anonymous = (decorators & ON_UNKNOWN_OOP_REF) != 0;
bool precise = is_array || on_anonymous;
// Load and record the previous value.
g1_write_barrier_pre(masm, decorators,
base, ind_or_offs,
tmp1, tmp2, tmp3,
preservation_level);
BarrierSetAssembler::store_at(masm, decorators,
type, base, ind_or_offs, val,
tmp1, tmp2, tmp3,
preservation_level);
// No need for post barrier if storing NULL
if (val != noreg) {
if (precise) {
if (ind_or_offs.is_constant()) {
__ add_const_optimized(base, base, ind_or_offs.as_constant(), tmp1);
} else {
__ add(base, ind_or_offs.as_register(), base);
}
}
g1_write_barrier_post(masm, decorators,
base, val,
tmp1, tmp2, tmp3,
preservation_level);
}
}
void G1BarrierSetAssembler::load_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
Register base, RegisterOrConstant ind_or_offs, Register dst,
Register tmp1, Register tmp2,
MacroAssembler::PreservationLevel preservation_level, Label *L_handle_null) {
bool on_oop = is_reference_type(type);
bool on_weak = (decorators & ON_WEAK_OOP_REF) != 0;
bool on_phantom = (decorators & ON_PHANTOM_OOP_REF) != 0;
bool on_reference = on_weak || on_phantom;
Label done;
if (on_oop && on_reference && L_handle_null == NULL) { L_handle_null = &done; }
// Load the value of the referent field.
ModRefBarrierSetAssembler::load_at(masm, decorators, type,
base, ind_or_offs, dst,
tmp1, tmp2,
preservation_level, L_handle_null);
if (on_oop && on_reference) {
// Generate the G1 pre-barrier code to log the value of
// the referent field in an SATB buffer. Note with
// these parameters the pre-barrier does not generate
// the load of the previous value
// We only reach here if value is not null.
g1_write_barrier_pre(masm, decorators | IS_NOT_NULL,
noreg /* obj */, (intptr_t)0, dst /* pre_val */,
tmp1, tmp2,
preservation_level);
}
__ bind(done);
}
void G1BarrierSetAssembler::resolve_jobject(MacroAssembler* masm, Register value,
Register tmp1, Register tmp2,
MacroAssembler::PreservationLevel preservation_level) {
Label done, not_weak;
__ cmpdi(CCR0, value, 0);
__ beq(CCR0, done); // Use NULL as-is.
__ clrrdi(tmp1, value, JNIHandles::weak_tag_size);
__ andi_(tmp2, value, JNIHandles::weak_tag_mask);
__ ld(value, 0, tmp1); // Resolve (untagged) jobject.
__ beq(CCR0, not_weak); // Test for jweak tag.
__ verify_oop(value, FILE_AND_LINE);
g1_write_barrier_pre(masm, IN_NATIVE | ON_PHANTOM_OOP_REF,
noreg, noreg, value,
tmp1, tmp2,
preservation_level);
__ bind(not_weak);
__ verify_oop(value, FILE_AND_LINE);
__ bind(done);
}
#ifdef COMPILER1
#undef __
#define __ ce->masm()->
void G1BarrierSetAssembler::gen_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());
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*/);
}
__ cmpdi(CCR0, pre_val_reg, 0);
__ bc_far_optimized(Assembler::bcondCRbiIs1, __ bi0(CCR0, Assembler::equal), *stub->continuation());
address c_code = bs->pre_barrier_c1_runtime_code_blob()->code_begin();
//__ load_const_optimized(R0, c_code);
__ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(c_code));
__ std(pre_val_reg, -8, R1_SP); // Pass pre_val on stack.
__ mtctr(R0);
__ bctrl();
__ b(*stub->continuation());
}
void G1BarrierSetAssembler::gen_post_barrier_stub(LIR_Assembler* ce, G1PostBarrierStub* stub) {
G1BarrierSetC1* bs = (G1BarrierSetC1*)BarrierSet::barrier_set()->barrier_set_c1();
__ bind(*stub->entry());
assert(stub->addr()->is_register(), "Precondition.");
assert(stub->new_val()->is_register(), "Precondition.");
Register addr_reg = stub->addr()->as_pointer_register();
Register new_val_reg = stub->new_val()->as_register();
__ cmpdi(CCR0, new_val_reg, 0);
__ bc_far_optimized(Assembler::bcondCRbiIs1, __ bi0(CCR0, Assembler::equal), *stub->continuation());
address c_code = bs->post_barrier_c1_runtime_code_blob()->code_begin();
//__ load_const_optimized(R0, c_code);
__ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(c_code));
__ mtctr(R0);
__ mr(R0, addr_reg); // Pass addr in R0.
__ bctrl();
__ b(*stub->continuation());
}
#undef __
#define __ sasm->
void G1BarrierSetAssembler::generate_c1_pre_barrier_runtime_stub(StubAssembler* sasm) {
BarrierSet* bs = BarrierSet::barrier_set();
__ set_info("g1_pre_barrier_slow_id", false);
// Using stack slots: pre_val (pre-pushed), spill tmp, spill tmp2.
const int stack_slots = 3;
Register pre_val = R0; // previous value of memory
Register tmp = R14;
Register tmp2 = R15;
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());
// Spill
__ std(tmp, -16, R1_SP);
__ std(tmp2, -24, R1_SP);
// Is marking still active?
if (in_bytes(SATBMarkQueue::byte_width_of_active()) == 4) {
__ lwz(tmp, satb_q_active_byte_offset, R16_thread);
} else {
assert(in_bytes(SATBMarkQueue::byte_width_of_active()) == 1, "Assumption");
__ lbz(tmp, satb_q_active_byte_offset, R16_thread);
}
__ cmpdi(CCR0, tmp, 0);
__ beq(CCR0, marking_not_active);
__ bind(restart);
// Load the index into the SATB buffer. SATBMarkQueue::_index is a
// size_t so ld_ptr is appropriate.
__ ld(tmp, satb_q_index_byte_offset, R16_thread);
// index == 0?
__ cmpdi(CCR0, tmp, 0);
__ beq(CCR0, refill);
__ ld(tmp2, satb_q_buf_byte_offset, R16_thread);
__ ld(pre_val, -8, R1_SP); // Load from stack.
__ addi(tmp, tmp, -oopSize);
__ std(tmp, satb_q_index_byte_offset, R16_thread);
__ stdx(pre_val, tmp2, tmp); // [_buf + index] := <address_of_card>
__ bind(marking_not_active);
// Restore temp registers and return-from-leaf.
__ ld(tmp2, -24, R1_SP);
__ ld(tmp, -16, R1_SP);
__ blr();
__ bind(refill);
const int nbytes_save = (MacroAssembler::num_volatile_regs + stack_slots) * BytesPerWord;
__ save_volatile_gprs(R1_SP, -nbytes_save); // except R0
__ mflr(R0);
__ std(R0, _abi0(lr), R1_SP);
__ push_frame_reg_args(nbytes_save, R0); // dummy frame for C call
__ call_VM_leaf(CAST_FROM_FN_PTR(address, G1SATBMarkQueueSet::handle_zero_index_for_thread), R16_thread);
__ pop_frame();
__ ld(R0, _abi0(lr), R1_SP);
__ mtlr(R0);
__ restore_volatile_gprs(R1_SP, -nbytes_save); // except R0
__ b(restart);
}
void G1BarrierSetAssembler::generate_c1_post_barrier_runtime_stub(StubAssembler* sasm) {
G1BarrierSet* bs = barrier_set_cast<G1BarrierSet>(BarrierSet::barrier_set());
__ set_info("g1_post_barrier_slow_id", false);
// Using stack slots: spill addr, spill tmp2
const int stack_slots = 2;
Register tmp = R0;
Register addr = R14;
Register tmp2 = R15;
CardTable::CardValue* byte_map_base = bs->card_table()->byte_map_base();
Label restart, refill, ret;
// Spill
__ std(addr, -8, R1_SP);
__ std(tmp2, -16, R1_SP);
__ srdi(addr, R0, CardTable::card_shift()); // Addr is passed in R0.
__ load_const_optimized(/*cardtable*/ tmp2, byte_map_base, tmp);
__ add(addr, tmp2, addr);
__ lbz(tmp, 0, addr); // tmp := [addr + cardtable]
// Return if young card.
__ cmpwi(CCR0, tmp, G1CardTable::g1_young_card_val());
__ beq(CCR0, ret);
// Return if sequential consistent value is already dirty.
__ membar(Assembler::StoreLoad);
__ lbz(tmp, 0, addr); // tmp := [addr + cardtable]
__ cmpwi(CCR0, tmp, G1CardTable::dirty_card_val());
__ beq(CCR0, ret);
// Not dirty.
// First, dirty it.
__ li(tmp, G1CardTable::dirty_card_val());
__ stb(tmp, 0, addr);
int dirty_card_q_index_byte_offset = in_bytes(G1ThreadLocalData::dirty_card_queue_index_offset());
int dirty_card_q_buf_byte_offset = in_bytes(G1ThreadLocalData::dirty_card_queue_buffer_offset());
__ bind(restart);
// Get the index into the update buffer. G1DirtyCardQueue::_index is
// a size_t so ld_ptr is appropriate here.
__ ld(tmp2, dirty_card_q_index_byte_offset, R16_thread);
// index == 0?
__ cmpdi(CCR0, tmp2, 0);
__ beq(CCR0, refill);
__ ld(tmp, dirty_card_q_buf_byte_offset, R16_thread);
__ addi(tmp2, tmp2, -oopSize);
__ std(tmp2, dirty_card_q_index_byte_offset, R16_thread);
__ add(tmp2, tmp, tmp2);
__ std(addr, 0, tmp2); // [_buf + index] := <address_of_card>
// Restore temp registers and return-from-leaf.
__ bind(ret);
__ ld(tmp2, -16, R1_SP);
__ ld(addr, -8, R1_SP);
__ blr();
__ bind(refill);
const int nbytes_save = (MacroAssembler::num_volatile_regs + stack_slots) * BytesPerWord;
__ save_volatile_gprs(R1_SP, -nbytes_save); // except R0
__ mflr(R0);
__ std(R0, _abi0(lr), R1_SP);
__ push_frame_reg_args(nbytes_save, R0); // dummy frame for C call
__ call_VM_leaf(CAST_FROM_FN_PTR(address, G1DirtyCardQueueSet::handle_zero_index_for_thread), R16_thread);
__ pop_frame();
__ ld(R0, _abi0(lr), R1_SP);
__ mtlr(R0);
__ restore_volatile_gprs(R1_SP, -nbytes_save); // except R0
__ b(restart);
}
#undef __
#endif // COMPILER1