static OopMap* save_live_registers(StubAssembler* sasm, bool save_fpu_registers = true) {
assert(frame_size_in_bytes == __ total_frame_size_in_bytes(reg_save_size_in_words),
"mismatch in calculation");
__ save_frame_c1(frame_size_in_bytes);
// Record volatile registers as callee-save values in an OopMap so their save locations will be
// propagated to the caller frame's RegisterMap during StackFrameStream construction (needed for
// deoptimization; see compiledVFrame::create_stack_value). The caller's I, L and O registers
// are saved in register windows - I's and L's in the caller's frame and O's in the stub frame
// (as the stub's I's) when the runtime routine called by the stub creates its frame.
// OopMap frame sizes are in c2 stack slot sizes (sizeof(jint))
int i;
for (i = 0; i < FrameMap::nof_cpu_regs; i++) {
Register r = as_Register(i);
if (r == G1 || r == G3 || r == G4 || r == G5) {
int sp_offset = cpu_reg_save_offsets[i];
__ st_ptr(r, SP, (sp_offset * BytesPerWord) + STACK_BIAS);
}
}
if (save_fpu_registers) {
for (i = 0; i < FrameMap::nof_fpu_regs; i++) {
FloatRegister r = as_FloatRegister(i);
int sp_offset = fpu_reg_save_offsets[i];
__ stf(FloatRegisterImpl::S, r, SP, (sp_offset * BytesPerWord) + STACK_BIAS);
}
}
return generate_oop_map(sasm, save_fpu_registers);
}
OopMapSet* Runtime1::generate_handle_exception(StubID id, StubAssembler* sasm) {
__ block_comment("generate_handle_exception");
// Save registers, if required.
OopMapSet* oop_maps = new OopMapSet();
OopMap* oop_map = NULL;
switch (id) {
case forward_exception_id:
// We're handling an exception in the context of a compiled frame.
// The registers have been saved in the standard places. Perform
// an exception lookup in the caller and dispatch to the handler
// if found. Otherwise unwind and dispatch to the callers
// exception handler.
oop_map = generate_oop_map(sasm, true);
// transfer the pending exception to the exception_oop
__ ld_ptr(G2_thread, in_bytes(JavaThread::pending_exception_offset()), Oexception);
__ ld_ptr(Oexception, 0, G0);
__ st_ptr(G0, G2_thread, in_bytes(JavaThread::pending_exception_offset()));
__ add(I7, frame::pc_return_offset, Oissuing_pc);
break;
case handle_exception_id:
// At this point all registers MAY be live.
oop_map = save_live_registers(sasm);
__ mov(Oexception->after_save(), Oexception);
__ mov(Oissuing_pc->after_save(), Oissuing_pc);
break;
case handle_exception_from_callee_id:
// At this point all registers except exception oop (Oexception)
// and exception pc (Oissuing_pc) are dead.
oop_map = new OopMap(frame_size_in_bytes / sizeof(jint), 0);
sasm->set_frame_size(frame_size_in_bytes / BytesPerWord);
__ save_frame_c1(frame_size_in_bytes);
__ mov(Oexception->after_save(), Oexception);
__ mov(Oissuing_pc->after_save(), Oissuing_pc);
break;
default: ShouldNotReachHere();
}
__ verify_not_null_oop(Oexception);
// save the exception and issuing pc in the thread
__ st_ptr(Oexception, G2_thread, in_bytes(JavaThread::exception_oop_offset()));
__ st_ptr(Oissuing_pc, G2_thread, in_bytes(JavaThread::exception_pc_offset()));
// use the throwing pc as the return address to lookup (has bci & oop map)
__ mov(Oissuing_pc, I7);
__ sub(I7, frame::pc_return_offset, I7);
int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc));
oop_maps->add_gc_map(call_offset, oop_map);
// Note: if nmethod has been deoptimized then regardless of
// whether it had a handler or not we will deoptimize
// by entering the deopt blob with a pending exception.
// Restore the registers that were saved at the beginning, remove
// the frame and jump to the exception handler.
switch (id) {
case forward_exception_id:
case handle_exception_id:
restore_live_registers(sasm);
__ jmp(O0, 0);
__ delayed()->restore();
break;
case handle_exception_from_callee_id:
// Restore SP from L7 if the exception PC is a method handle call site.
__ mov(O0, G5); // Save the target address.
__ lduw(Address(G2_thread, JavaThread::is_method_handle_return_offset()), L0);
__ tst(L0); // Condition codes are preserved over the restore.
__ restore();
__ jmp(G5, 0); // jump to the exception handler
__ delayed()->movcc(Assembler::notZero, false, Assembler::icc, L7_mh_SP_save, SP); // Restore SP if required.
break;
default: ShouldNotReachHere();
}
return oop_maps;
}
OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
OopMapSet* oop_maps = NULL;
// for better readability
const bool must_gc_arguments = true;
const bool dont_gc_arguments = false;
// stub code & info for the different stubs
switch (id) {
case forward_exception_id:
{
// we're handling an exception in the context of a compiled
// frame. The registers have been saved in the standard
// places. Perform an exception lookup in the caller and
// dispatch to the handler if found. Otherwise unwind and
// dispatch to the callers exception handler.
oop_maps = new OopMapSet();
OopMap* oop_map = generate_oop_map(sasm, true);
// transfer the pending exception to the exception_oop
__ ld_ptr(G2_thread, in_bytes(JavaThread::pending_exception_offset()), Oexception);
__ ld_ptr(Oexception, 0, G0);
__ st_ptr(G0, G2_thread, in_bytes(JavaThread::pending_exception_offset()));
__ add(I7, frame::pc_return_offset, Oissuing_pc);
generate_handle_exception(sasm, oop_maps, oop_map);
__ should_not_reach_here();
}
break;
case new_instance_id:
case fast_new_instance_id:
case fast_new_instance_init_check_id:
{
Register G5_klass = G5; // Incoming
Register O0_obj = O0; // Outgoing
if (id == new_instance_id) {
__ set_info("new_instance", dont_gc_arguments);
} else if (id == fast_new_instance_id) {
__ set_info("fast new_instance", dont_gc_arguments);
} else {
assert(id == fast_new_instance_init_check_id, "bad StubID");
__ set_info("fast new_instance init check", dont_gc_arguments);
}
if ((id == fast_new_instance_id || id == fast_new_instance_init_check_id) &&
UseTLAB && FastTLABRefill) {
Label slow_path;
Register G1_obj_size = G1;
Register G3_t1 = G3;
Register G4_t2 = G4;
assert_different_registers(G5_klass, G1_obj_size, G3_t1, G4_t2);
// Push a frame since we may do dtrace notification for the
// allocation which requires calling out and we don't want
// to stomp the real return address.
__ save_frame(0);
if (id == fast_new_instance_init_check_id) {
// make sure the klass is initialized
__ ld(G5_klass, instanceKlass::init_state_offset_in_bytes() + sizeof(oopDesc), G3_t1);
__ cmp(G3_t1, instanceKlass::fully_initialized);
__ br(Assembler::notEqual, false, Assembler::pn, slow_path);
__ delayed()->nop();
}
#ifdef ASSERT
// assert object can be fast path allocated
{
Label ok, not_ok;
__ ld(G5_klass, Klass::layout_helper_offset_in_bytes() + sizeof(oopDesc), G1_obj_size);
__ cmp(G1_obj_size, 0); // make sure it's an instance (LH > 0)
__ br(Assembler::lessEqual, false, Assembler::pn, not_ok);
__ delayed()->nop();
__ btst(Klass::_lh_instance_slow_path_bit, G1_obj_size);
__ br(Assembler::zero, false, Assembler::pn, ok);
__ delayed()->nop();
__ bind(not_ok);
__ stop("assert(can be fast path allocated)");
__ should_not_reach_here();
__ bind(ok);
}
#endif // ASSERT
// if we got here then the TLAB allocation failed, so try
// refilling the TLAB or allocating directly from eden.
Label retry_tlab, try_eden;
__ tlab_refill(retry_tlab, try_eden, slow_path); // preserves G5_klass
__ bind(retry_tlab);
// get the instance size
__ ld(G5_klass, klassOopDesc::header_size() * HeapWordSize + Klass::layout_helper_offset_in_bytes(), G1_obj_size);
__ tlab_allocate(O0_obj, G1_obj_size, 0, G3_t1, slow_path);
__ initialize_object(O0_obj, G5_klass, G1_obj_size, 0, G3_t1, G4_t2);
__ verify_oop(O0_obj);
__ mov(O0, I0);
__ ret();
__ delayed()->restore();
__ bind(try_eden);
// get the instance size
__ ld(G5_klass, klassOopDesc::header_size() * HeapWordSize + Klass::layout_helper_offset_in_bytes(), G1_obj_size);
__ eden_allocate(O0_obj, G1_obj_size, 0, G3_t1, G4_t2, slow_path);
__ initialize_object(O0_obj, G5_klass, G1_obj_size, 0, G3_t1, G4_t2);
__ verify_oop(O0_obj);
__ mov(O0, I0);
__ ret();
__ delayed()->restore();
__ bind(slow_path);
// pop this frame so generate_stub_call can push it's own
__ restore();
}
oop_maps = generate_stub_call(sasm, I0, CAST_FROM_FN_PTR(address, new_instance), G5_klass);
// I0->O0: new instance
}
break;
#ifdef TIERED
case counter_overflow_id:
// G4 contains bci
oop_maps = generate_stub_call(sasm, noreg, CAST_FROM_FN_PTR(address, counter_overflow), G4);
break;
#endif // TIERED
case new_type_array_id:
case new_object_array_id:
{
Register G5_klass = G5; // Incoming
Register G4_length = G4; // Incoming
Register O0_obj = O0; // Outgoing
Address klass_lh(G5_klass, ((klassOopDesc::header_size() * HeapWordSize)
+ Klass::layout_helper_offset_in_bytes()));
assert(Klass::_lh_header_size_shift % BitsPerByte == 0, "bytewise");
assert(Klass::_lh_header_size_mask == 0xFF, "bytewise");
// Use this offset to pick out an individual byte of the layout_helper:
const int klass_lh_header_size_offset = ((BytesPerInt - 1) // 3 - 2 selects byte {0,1,0,0}
- Klass::_lh_header_size_shift / BitsPerByte);
if (id == new_type_array_id) {
__ set_info("new_type_array", dont_gc_arguments);
} else {
__ set_info("new_object_array", dont_gc_arguments);
}
#ifdef ASSERT
// assert object type is really an array of the proper kind
{
Label ok;
Register G3_t1 = G3;
__ ld(klass_lh, G3_t1);
__ sra(G3_t1, Klass::_lh_array_tag_shift, G3_t1);
int tag = ((id == new_type_array_id)
? Klass::_lh_array_tag_type_value
: Klass::_lh_array_tag_obj_value);
__ cmp(G3_t1, tag);
__ brx(Assembler::equal, false, Assembler::pt, ok);
__ delayed()->nop();
__ stop("assert(is an array klass)");
__ should_not_reach_here();
__ bind(ok);
}
#endif // ASSERT
if (UseTLAB && FastTLABRefill) {
Label slow_path;
Register G1_arr_size = G1;
Register G3_t1 = G3;
Register O1_t2 = O1;
assert_different_registers(G5_klass, G4_length, G1_arr_size, G3_t1, O1_t2);
// check that array length is small enough for fast path
__ set(C1_MacroAssembler::max_array_allocation_length, G3_t1);
__ cmp(G4_length, G3_t1);
__ br(Assembler::greaterUnsigned, false, Assembler::pn, slow_path);
__ delayed()->nop();
// if we got here then the TLAB allocation failed, so try
// refilling the TLAB or allocating directly from eden.
Label retry_tlab, try_eden;
__ tlab_refill(retry_tlab, try_eden, slow_path); // preserves G4_length and G5_klass
__ bind(retry_tlab);
// get the allocation size: (length << (layout_helper & 0x1F)) + header_size
__ ld(klass_lh, G3_t1);
__ sll(G4_length, G3_t1, G1_arr_size);
__ srl(G3_t1, Klass::_lh_header_size_shift, G3_t1);
__ and3(G3_t1, Klass::_lh_header_size_mask, G3_t1);
__ add(G1_arr_size, G3_t1, G1_arr_size);
__ add(G1_arr_size, MinObjAlignmentInBytesMask, G1_arr_size); // align up
__ and3(G1_arr_size, ~MinObjAlignmentInBytesMask, G1_arr_size);
__ tlab_allocate(O0_obj, G1_arr_size, 0, G3_t1, slow_path); // preserves G1_arr_size
__ initialize_header(O0_obj, G5_klass, G4_length, G3_t1, O1_t2);
__ ldub(klass_lh, G3_t1, klass_lh_header_size_offset);
__ sub(G1_arr_size, G3_t1, O1_t2); // body length
__ add(O0_obj, G3_t1, G3_t1); // body start
__ initialize_body(G3_t1, O1_t2);
__ verify_oop(O0_obj);
__ retl();
__ delayed()->nop();
__ bind(try_eden);
// get the allocation size: (length << (layout_helper & 0x1F)) + header_size
__ ld(klass_lh, G3_t1);
__ sll(G4_length, G3_t1, G1_arr_size);
__ srl(G3_t1, Klass::_lh_header_size_shift, G3_t1);
__ and3(G3_t1, Klass::_lh_header_size_mask, G3_t1);
__ add(G1_arr_size, G3_t1, G1_arr_size);
__ add(G1_arr_size, MinObjAlignmentInBytesMask, G1_arr_size);
__ and3(G1_arr_size, ~MinObjAlignmentInBytesMask, G1_arr_size);
__ eden_allocate(O0_obj, G1_arr_size, 0, G3_t1, O1_t2, slow_path); // preserves G1_arr_size
__ initialize_header(O0_obj, G5_klass, G4_length, G3_t1, O1_t2);
__ ldub(klass_lh, G3_t1, klass_lh_header_size_offset);
__ sub(G1_arr_size, G3_t1, O1_t2); // body length
__ add(O0_obj, G3_t1, G3_t1); // body start
__ initialize_body(G3_t1, O1_t2);
__ verify_oop(O0_obj);
__ retl();
__ delayed()->nop();
__ bind(slow_path);
}
if (id == new_type_array_id) {
oop_maps = generate_stub_call(sasm, I0, CAST_FROM_FN_PTR(address, new_type_array), G5_klass, G4_length);
} else {
oop_maps = generate_stub_call(sasm, I0, CAST_FROM_FN_PTR(address, new_object_array), G5_klass, G4_length);
}
// I0 -> O0: new array
}
break;
case new_multi_array_id:
{ // O0: klass
// O1: rank
// O2: address of 1st dimension
__ set_info("new_multi_array", dont_gc_arguments);
oop_maps = generate_stub_call(sasm, I0, CAST_FROM_FN_PTR(address, new_multi_array), I0, I1, I2);
// I0 -> O0: new multi array
}
break;
case register_finalizer_id:
{
__ set_info("register_finalizer", dont_gc_arguments);
// load the klass and check the has finalizer flag
Label register_finalizer;
Register t = O1;
__ ld_ptr(O0, oopDesc::klass_offset_in_bytes(), t);
__ ld(t, Klass::access_flags_offset_in_bytes() + sizeof(oopDesc), t);
__ set(JVM_ACC_HAS_FINALIZER, G3);
__ andcc(G3, t, G0);
__ br(Assembler::notZero, false, Assembler::pt, register_finalizer);
__ delayed()->nop();
// do a leaf return
__ retl();
__ delayed()->nop();
__ bind(register_finalizer);
OopMap* oop_map = save_live_registers(sasm);
int call_offset = __ call_RT(noreg, noreg,
CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), I0);
oop_maps = new OopMapSet();
oop_maps->add_gc_map(call_offset, oop_map);
// Now restore all the live registers
restore_live_registers(sasm);
__ ret();
__ delayed()->restore();
}
break;
case throw_range_check_failed_id:
{ __ set_info("range_check_failed", dont_gc_arguments); // arguments will be discarded
// G4: index
oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true);
}
break;
case throw_index_exception_id:
{ __ set_info("index_range_check_failed", dont_gc_arguments); // arguments will be discarded
// G4: index
oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true);
}
break;
case throw_div0_exception_id:
{ __ set_info("throw_div0_exception", dont_gc_arguments);
oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false);
}
break;
case throw_null_pointer_exception_id:
{ __ set_info("throw_null_pointer_exception", dont_gc_arguments);
oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false);
}
break;
case handle_exception_id:
{
__ set_info("handle_exception", dont_gc_arguments);
// make a frame and preserve the caller's caller-save registers
oop_maps = new OopMapSet();
OopMap* oop_map = save_live_registers(sasm);
__ mov(Oexception->after_save(), Oexception);
__ mov(Oissuing_pc->after_save(), Oissuing_pc);
generate_handle_exception(sasm, oop_maps, oop_map);
}
break;
case unwind_exception_id:
{
// O0: exception
// I7: address of call to this method
__ set_info("unwind_exception", dont_gc_arguments);
__ mov(Oexception, Oexception->after_save());
__ add(I7, frame::pc_return_offset, Oissuing_pc->after_save());
__ call_VM_leaf(L7_thread_cache, CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address),
Oissuing_pc->after_save());
__ verify_not_null_oop(Oexception->after_save());
__ jmp(O0, 0);
__ delayed()->restore();
}
break;
case throw_array_store_exception_id:
{
__ set_info("throw_array_store_exception", dont_gc_arguments);
oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), false);
}
break;
case throw_class_cast_exception_id:
{
// G4: object
__ set_info("throw_class_cast_exception", dont_gc_arguments);
oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true);
}
break;
case throw_incompatible_class_change_error_id:
{
__ set_info("throw_incompatible_class_cast_exception", dont_gc_arguments);
oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false);
}
break;
case slow_subtype_check_id:
{ // Support for uint StubRoutine::partial_subtype_check( Klass sub, Klass super );
// Arguments :
//
// ret : G3
// sub : G3, argument, destroyed
// super: G1, argument, not changed
// raddr: O7, blown by call
Label miss;
__ save_frame(0); // Blow no registers!
__ check_klass_subtype_slow_path(G3, G1, L0, L1, L2, L4, NULL, &miss);
__ mov(1, G3);
__ ret(); // Result in G5 is 'true'
__ delayed()->restore(); // free copy or add can go here
__ bind(miss);
__ mov(0, G3);
__ ret(); // Result in G5 is 'false'
__ delayed()->restore(); // free copy or add can go here
}
case monitorenter_nofpu_id:
case monitorenter_id:
{ // G4: object
// G5: lock address
__ set_info("monitorenter", dont_gc_arguments);
int save_fpu_registers = (id == monitorenter_id);
// make a frame and preserve the caller's caller-save registers
OopMap* oop_map = save_live_registers(sasm, save_fpu_registers);
int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), G4, G5);
oop_maps = new OopMapSet();
oop_maps->add_gc_map(call_offset, oop_map);
restore_live_registers(sasm, save_fpu_registers);
__ ret();
__ delayed()->restore();
}
break;
case monitorexit_nofpu_id:
case monitorexit_id:
{ // G4: lock address
// note: really a leaf routine but must setup last java sp
// => use call_RT for now (speed can be improved by
// doing last java sp setup manually)
__ set_info("monitorexit", dont_gc_arguments);
int save_fpu_registers = (id == monitorexit_id);
// make a frame and preserve the caller's caller-save registers
OopMap* oop_map = save_live_registers(sasm, save_fpu_registers);
int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), G4);
oop_maps = new OopMapSet();
oop_maps->add_gc_map(call_offset, oop_map);
restore_live_registers(sasm, save_fpu_registers);
__ ret();
__ delayed()->restore();
}
break;
case access_field_patching_id:
{ __ set_info("access_field_patching", dont_gc_arguments);
oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching));
}
break;
case load_klass_patching_id:
{ __ set_info("load_klass_patching", dont_gc_arguments);
oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching));
}
break;
case jvmti_exception_throw_id:
{ // Oexception : exception
__ set_info("jvmti_exception_throw", dont_gc_arguments);
oop_maps = generate_stub_call(sasm, noreg, CAST_FROM_FN_PTR(address, Runtime1::post_jvmti_exception_throw), I0);
}
break;
case dtrace_object_alloc_id:
{ // O0: object
__ set_info("dtrace_object_alloc", dont_gc_arguments);
// we can't gc here so skip the oopmap but make sure that all
// the live registers get saved.
save_live_registers(sasm);
__ save_thread(L7_thread_cache);
__ call(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_object_alloc),
relocInfo::runtime_call_type);
__ delayed()->mov(I0, O0);
__ restore_thread(L7_thread_cache);
restore_live_registers(sasm);
__ ret();
__ delayed()->restore();
}
break;
#ifndef SERIALGC
case g1_pre_barrier_slow_id:
{ // G4: previous value of memory
BarrierSet* bs = Universe::heap()->barrier_set();
if (bs->kind() != BarrierSet::G1SATBCTLogging) {
__ save_frame(0);
__ set((int)id, O1);
__ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), I0);
__ should_not_reach_here();
break;
}
__ set_info("g1_pre_barrier_slow_id", dont_gc_arguments);
Register pre_val = G4;
Register tmp = G1_scratch;
Register tmp2 = G3_scratch;
Label refill, restart;
bool with_frame = false; // I don't know if we can do with-frame.
int satb_q_index_byte_offset =
in_bytes(JavaThread::satb_mark_queue_offset() +
PtrQueue::byte_offset_of_index());
int satb_q_buf_byte_offset =
in_bytes(JavaThread::satb_mark_queue_offset() +
PtrQueue::byte_offset_of_buf());
__ bind(restart);
__ ld_ptr(G2_thread, satb_q_index_byte_offset, tmp);
__ br_on_reg_cond(Assembler::rc_z, /*annul*/false,
Assembler::pn, tmp, refill);
// If the branch is taken, no harm in executing this in the delay slot.
__ delayed()->ld_ptr(G2_thread, satb_q_buf_byte_offset, tmp2);
__ sub(tmp, oopSize, tmp);
__ st_ptr(pre_val, tmp2, tmp); // [_buf + index] := <address_of_card>
// Use return-from-leaf
__ retl();
__ delayed()->st_ptr(tmp, G2_thread, satb_q_index_byte_offset);
__ bind(refill);
__ save_frame(0);
__ mov(pre_val, L0);
__ mov(tmp, L1);
__ mov(tmp2, L2);
__ call_VM_leaf(L7_thread_cache,
CAST_FROM_FN_PTR(address,
SATBMarkQueueSet::handle_zero_index_for_thread),
G2_thread);
__ mov(L0, pre_val);
__ mov(L1, tmp);
__ mov(L2, tmp2);
__ br(Assembler::always, /*annul*/false, Assembler::pt, restart);
__ delayed()->restore();
}
break;
case g1_post_barrier_slow_id:
{
BarrierSet* bs = Universe::heap()->barrier_set();
if (bs->kind() != BarrierSet::G1SATBCTLogging) {
__ save_frame(0);
__ set((int)id, O1);
__ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), I0);
__ should_not_reach_here();
break;
}
__ set_info("g1_post_barrier_slow_id", dont_gc_arguments);
Register addr = G4;
Register cardtable = G5;
Register tmp = G1_scratch;
Register tmp2 = G3_scratch;
jbyte* byte_map_base = ((CardTableModRefBS*)bs)->byte_map_base;
Label not_already_dirty, restart, refill;
#ifdef _LP64
__ srlx(addr, CardTableModRefBS::card_shift, addr);
#else
__ srl(addr, CardTableModRefBS::card_shift, addr);
#endif
AddressLiteral rs(byte_map_base);
__ set(rs, cardtable); // cardtable := <card table base>
__ ldub(addr, cardtable, tmp); // tmp := [addr + cardtable]
__ br_on_reg_cond(Assembler::rc_nz, /*annul*/false, Assembler::pt,
tmp, not_already_dirty);
// Get cardtable + tmp into a reg by itself -- useful in the take-the-branch
// case, harmless if not.
__ delayed()->add(addr, cardtable, tmp2);
// We didn't take the branch, so we're already dirty: return.
// Use return-from-leaf
__ retl();
__ delayed()->nop();
// Not dirty.
__ bind(not_already_dirty);
// First, dirty it.
__ stb(G0, tmp2, 0); // [cardPtr] := 0 (i.e., dirty).
Register tmp3 = cardtable;
Register tmp4 = tmp;
// these registers are now dead
addr = cardtable = tmp = noreg;
int dirty_card_q_index_byte_offset =
in_bytes(JavaThread::dirty_card_queue_offset() +
PtrQueue::byte_offset_of_index());
int dirty_card_q_buf_byte_offset =
in_bytes(JavaThread::dirty_card_queue_offset() +
PtrQueue::byte_offset_of_buf());
__ bind(restart);
__ ld_ptr(G2_thread, dirty_card_q_index_byte_offset, tmp3);
__ br_on_reg_cond(Assembler::rc_z, /*annul*/false, Assembler::pn,
tmp3, refill);
// If the branch is taken, no harm in executing this in the delay slot.
__ delayed()->ld_ptr(G2_thread, dirty_card_q_buf_byte_offset, tmp4);
__ sub(tmp3, oopSize, tmp3);
__ st_ptr(tmp2, tmp4, tmp3); // [_buf + index] := <address_of_card>
// Use return-from-leaf
__ retl();
__ delayed()->st_ptr(tmp3, G2_thread, dirty_card_q_index_byte_offset);
__ bind(refill);
__ save_frame(0);
__ mov(tmp2, L0);
__ mov(tmp3, L1);
__ mov(tmp4, L2);
__ call_VM_leaf(L7_thread_cache,
CAST_FROM_FN_PTR(address,
DirtyCardQueueSet::handle_zero_index_for_thread),
G2_thread);
__ mov(L0, tmp2);
__ mov(L1, tmp3);
__ mov(L2, tmp4);
__ br(Assembler::always, /*annul*/false, Assembler::pt, restart);
__ delayed()->restore();
}
break;
#endif // !SERIALGC
default:
{ __ set_info("unimplemented entry", dont_gc_arguments);
__ save_frame(0);
__ set((int)id, O1);
__ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), O1);
__ should_not_reach_here();
}
break;
}
return oop_maps;
}