c1_CodeStubs_x86.cpp revision 1472:c18cbe5936b8
11541Srgrimes/* 21541Srgrimes * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. 31541Srgrimes * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 41541Srgrimes * 51541Srgrimes * This code is free software; you can redistribute it and/or modify it 61541Srgrimes * under the terms of the GNU General Public License version 2 only, as 71541Srgrimes * published by the Free Software Foundation. 81541Srgrimes * 91541Srgrimes * This code is distributed in the hope that it will be useful, but WITHOUT 101541Srgrimes * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 111541Srgrimes * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 121541Srgrimes * version 2 for more details (a copy is included in the LICENSE file that 131541Srgrimes * accompanied this code). 141541Srgrimes * 151541Srgrimes * You should have received a copy of the GNU General Public License version 161541Srgrimes * 2 along with this work; if not, write to the Free Software Foundation, 171541Srgrimes * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 181541Srgrimes * 191541Srgrimes * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 201541Srgrimes * or visit www.oracle.com if you need additional information or have any 211541Srgrimes * questions. 221541Srgrimes * 231541Srgrimes */ 241541Srgrimes 251541Srgrimes#include "incls/_precompiled.incl" 261541Srgrimes#include "incls/_c1_CodeStubs_x86.cpp.incl" 271541Srgrimes 281541Srgrimes 291541Srgrimes#define __ ce->masm()-> 301541Srgrimes 311541Srgrimesfloat ConversionStub::float_zero = 0.0; 321541Srgrimesdouble ConversionStub::double_zero = 0.0; 331541Srgrimes 341541Srgrimesvoid ConversionStub::emit_code(LIR_Assembler* ce) { 351541Srgrimes __ bind(_entry); 361541Srgrimes assert(bytecode() == Bytecodes::_f2i || bytecode() == Bytecodes::_d2i, "other conversions do not require stub"); 371541Srgrimes 3844510Swollman 3950477Speter if (input()->is_single_xmm()) { 401541Srgrimes __ comiss(input()->as_xmm_float_reg(), 411541Srgrimes ExternalAddress((address)&float_zero)); 421541Srgrimes } else if (input()->is_double_xmm()) { 431541Srgrimes __ comisd(input()->as_xmm_double_reg(), 4433392Sphk ExternalAddress((address)&double_zero)); 451541Srgrimes } else { 4668840Sjhb LP64_ONLY(ShouldNotReachHere()); 471541Srgrimes __ push(rax); 4833392Sphk __ ftst(); 4933392Sphk __ fnstsw_ax(); 5033392Sphk __ sahf(); 5133392Sphk __ pop(rax); 5233392Sphk } 5333392Sphk 5429680Sgibbs Label NaN, do_return; 5529680Sgibbs __ jccb(Assembler::parity, NaN); 5629680Sgibbs __ jccb(Assembler::below, do_return); 5729680Sgibbs 5833392Sphk // input is > 0 -> return maxInt 5968889Sjake // result register already contains 0x80000000, so subtracting 1 gives 0x7fffffff 602112Swollman __ decrement(result()->as_register()); 6129680Sgibbs __ jmpb(do_return); 621541Srgrimes 631541Srgrimes // input is NaN -> return 0 6429680Sgibbs __ bind(NaN); 6529680Sgibbs __ xorptr(result()->as_register(), result()->as_register()); 6629680Sgibbs 6729680Sgibbs __ bind(do_return); 6829680Sgibbs __ jmp(_continuation); 6929680Sgibbs} 7029680Sgibbs 7129680Sgibbs#ifdef TIERED 7229680Sgibbsvoid CounterOverflowStub::emit_code(LIR_Assembler* ce) { 7329680Sgibbs __ bind(_entry); 7432388Sphk ce->store_parameter(_bci, 0); 7529680Sgibbs __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::counter_overflow_id))); 761541Srgrimes ce->add_call_info_here(_info); 771541Srgrimes ce->verify_oop_map(_info); 781541Srgrimes 791541Srgrimes __ jmp(_continuation); 8067551Sjhb} 811541Srgrimes#endif // TIERED 821541Srgrimes 8329805Sgibbs 841541Srgrimes 8529805SgibbsRangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index, 8633392Sphk bool throw_index_out_of_bounds_exception) 871541Srgrimes : _throw_index_out_of_bounds_exception(throw_index_out_of_bounds_exception) 8833392Sphk , _index(index) 8933392Sphk{ 9033392Sphk _info = info == NULL ? NULL : new CodeEmitInfo(info); 9129680Sgibbs} 9229680Sgibbs 931541Srgrimes 9468889Sjakevoid RangeCheckStub::emit_code(LIR_Assembler* ce) { 9529680Sgibbs __ bind(_entry); 9629805Sgibbs // pass the array index on stack because all registers must be preserved 9729805Sgibbs if (_index->is_cpu_register()) { 9829805Sgibbs ce->store_parameter(_index->as_register(), 0); 9929805Sgibbs } else { 10029805Sgibbs ce->store_parameter(_index->as_jint(), 0); 10129805Sgibbs } 10229805Sgibbs Runtime1::StubID stub_id; 10329805Sgibbs if (_throw_index_out_of_bounds_exception) { 10429680Sgibbs stub_id = Runtime1::throw_index_exception_id; 10529805Sgibbs } else { 10629680Sgibbs stub_id = Runtime1::throw_range_check_failed_id; 10729680Sgibbs } 10829680Sgibbs __ call(RuntimeAddress(Runtime1::entry_for(stub_id))); 10929680Sgibbs ce->add_call_info_here(_info); 11029805Sgibbs debug_only(__ should_not_reach_here()); 11168889Sjake} 11229680Sgibbs 11329680Sgibbs 11468889Sjakevoid DivByZeroStub::emit_code(LIR_Assembler* ce) { 11529680Sgibbs if (_offset != -1) { 11629680Sgibbs ce->compilation()->implicit_exception_table()->append(_offset, __ offset()); 11729680Sgibbs } 11829680Sgibbs __ bind(_entry); 11929680Sgibbs __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_div0_exception_id))); 12029680Sgibbs ce->add_call_info_here(_info); 12168889Sjake debug_only(__ should_not_reach_here()); 12229680Sgibbs} 12329680Sgibbs 12429805Sgibbs 12529680Sgibbs// Implementation of NewInstanceStub 12629680Sgibbs 12768889SjakeNewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) { 12829680Sgibbs _result = result; 12944510Swollman _klass = klass; 13044510Swollman _klass_reg = klass_reg; 13144510Swollman _info = new CodeEmitInfo(info); 13244510Swollman assert(stub_id == Runtime1::new_instance_id || 13344510Swollman stub_id == Runtime1::fast_new_instance_id || 13444510Swollman stub_id == Runtime1::fast_new_instance_init_check_id, 13550673Sjlemon "need new_instance id"); 13644510Swollman _stub_id = stub_id; 13768889Sjake} 13868889Sjake 13968889Sjake 14029680Sgibbsvoid NewInstanceStub::emit_code(LIR_Assembler* ce) { 14129680Sgibbs assert(__ rsp_offset() == 0, "frame size should be fixed"); 14229680Sgibbs __ bind(_entry); 14368889Sjake __ movptr(rdx, _klass_reg->as_register()); 14468889Sjake __ call(RuntimeAddress(Runtime1::entry_for(_stub_id))); 14568889Sjake ce->add_call_info_here(_info); 14629680Sgibbs ce->verify_oop_map(_info); 14729680Sgibbs assert(_result->as_register() == rax, "result must in rax,"); 14829680Sgibbs __ jmp(_continuation); 14929680Sgibbs} 1501541Srgrimes 15129680Sgibbs 15268889Sjake// Implementation of NewTypeArrayStub 1531541Srgrimes 1541541SrgrimesNewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) { 1551541Srgrimes _klass_reg = klass_reg; 1561541Srgrimes _length = length; 1571541Srgrimes _result = result; 1581541Srgrimes _info = new CodeEmitInfo(info); 1591541Srgrimes} 1601541Srgrimes 1611541Srgrimes 1621541Srgrimesvoid NewTypeArrayStub::emit_code(LIR_Assembler* ce) { 16329680Sgibbs assert(__ rsp_offset() == 0, "frame size should be fixed"); 16429680Sgibbs __ bind(_entry); 16529680Sgibbs assert(_length->as_register() == rbx, "length must in rbx,"); 1661541Srgrimes assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx"); 16729680Sgibbs __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_type_array_id))); 16829680Sgibbs ce->add_call_info_here(_info); 16929680Sgibbs ce->verify_oop_map(_info); 17029680Sgibbs assert(_result->as_register() == rax, "result must in rax,"); 1711541Srgrimes __ jmp(_continuation); 17229680Sgibbs} 17329680Sgibbs 17433824Sbde 1751541Srgrimes// Implementation of NewObjectArrayStub 17669147Sjlemon 1771541SrgrimesNewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) { 17829680Sgibbs _klass_reg = klass_reg; 17929680Sgibbs _result = result; 18029680Sgibbs _length = length; 1811541Srgrimes _info = new CodeEmitInfo(info); 1821541Srgrimes} 18368889Sjake 1841541Srgrimes 1851541Srgrimesvoid NewObjectArrayStub::emit_code(LIR_Assembler* ce) { 18629680Sgibbs assert(__ rsp_offset() == 0, "frame size should be fixed"); 18729680Sgibbs __ bind(_entry); 18829680Sgibbs assert(_length->as_register() == rbx, "length must in rbx,"); 1891541Srgrimes assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx"); 19029680Sgibbs __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_object_array_id))); 19144510Swollman ce->add_call_info_here(_info); 19244510Swollman ce->verify_oop_map(_info); 1931541Srgrimes assert(_result->as_register() == rax, "result must in rax,"); 19444510Swollman __ jmp(_continuation); 19568889Sjake} 1961541Srgrimes 19729680Sgibbs 1981541Srgrimes// Implementation of MonitorAccessStubs 1991541Srgrimes 2001541SrgrimesMonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info) 20129680Sgibbs: MonitorAccessStub(obj_reg, lock_reg) 20233824Sbde{ 2031541Srgrimes _info = new CodeEmitInfo(info); 20429680Sgibbs} 2051541Srgrimes 2061541Srgrimes 2071541Srgrimesvoid MonitorEnterStub::emit_code(LIR_Assembler* ce) { 20829680Sgibbs assert(__ rsp_offset() == 0, "frame size should be fixed"); 20929680Sgibbs __ bind(_entry); 21029680Sgibbs ce->store_parameter(_obj_reg->as_register(), 1); 21129680Sgibbs ce->store_parameter(_lock_reg->as_register(), 0); 21229680Sgibbs Runtime1::StubID enter_id; 21329680Sgibbs if (ce->compilation()->has_fpu_code()) { 21429680Sgibbs enter_id = Runtime1::monitorenter_id; 21529680Sgibbs } else { 2161541Srgrimes enter_id = Runtime1::monitorenter_nofpu_id; 21768889Sjake } 21844510Swollman __ call(RuntimeAddress(Runtime1::entry_for(enter_id))); 21944510Swollman ce->add_call_info_here(_info); 22068889Sjake ce->verify_oop_map(_info); 2211541Srgrimes __ jmp(_continuation); 2221541Srgrimes} 2231541Srgrimes 22424101Sbde 22529680Sgibbsvoid MonitorExitStub::emit_code(LIR_Assembler* ce) { 22629680Sgibbs __ bind(_entry); 22729680Sgibbs if (_compute_lock) { 22829680Sgibbs // lock_reg was destroyed by fast unlocking attempt => recompute it 22929680Sgibbs ce->monitor_address(_monitor_ix, _lock_reg); 23044510Swollman } 23144510Swollman ce->store_parameter(_lock_reg->as_register(), 0); 23244510Swollman // note: non-blocking leaf routine => no call info needed 23344510Swollman Runtime1::StubID exit_id; 23444510Swollman if (ce->compilation()->has_fpu_code()) { 23544510Swollman exit_id = Runtime1::monitorexit_id; 23644510Swollman } else { 23744510Swollman exit_id = Runtime1::monitorexit_nofpu_id; 23850673Sjlemon } 23944510Swollman __ call(RuntimeAddress(Runtime1::entry_for(exit_id))); 24050673Sjlemon __ jmp(_continuation); 24150673Sjlemon} 24250673Sjlemon 24344510Swollman 24444510Swollman// Implementation of patching: 24569147Sjlemon// - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes) 24644510Swollman// - Replace original code with a call to the stub 24744510Swollman// At Runtime: 24844510Swollman// - call to stub, jump to runtime 24944510Swollman// - in runtime: preserve all registers (rspecially objects, i.e., source and destination object) 25044510Swollman// - in runtime: after initializing class, restore original code, reexecute instruction 25144510Swollman 25244510Swollmanint PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size; 25344510Swollman 25468889Sjakevoid PatchingStub::align_patch_site(MacroAssembler* masm) { 25544510Swollman // We're patching a 5-7 byte instruction on intel and we need to 25644510Swollman // make sure that we don't see a piece of the instruction. It 25744510Swollman // appears mostly impossible on Intel to simply invalidate other 25844510Swollman // processors caches and since they may do aggressive prefetch it's 25944510Swollman // very hard to make a guess about what code might be in the icache. 26044510Swollman // Force the instruction to be double word aligned so that it 26150673Sjlemon // doesn't span a cache line. 26244510Swollman masm->align(round_to(NativeGeneralJump::instruction_size, wordSize)); 26344510Swollman} 26444510Swollman 26544510Swollmanvoid PatchingStub::emit_code(LIR_Assembler* ce) { 26644510Swollman assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF, "not enough room for call"); 26769147Sjlemon 26844510Swollman Label call_patch; 26944510Swollman 27044510Swollman // static field accesses have special semantics while the class 27144510Swollman // initializer is being run so we emit a test which can be used to 27268889Sjake // check that this code is being executed by the initializing 27344510Swollman // thread. 27444510Swollman address being_initialized_entry = __ pc(); 27544510Swollman if (CommentedAssembly) { 27644510Swollman __ block_comment(" patch template"); 27744510Swollman } 27844510Swollman if (_id == load_klass_id) { 27944510Swollman // produce a copy of the load klass instruction for use by the being initialized case 28044510Swollman address start = __ pc(); 28144510Swollman jobject o = NULL; 28244510Swollman __ movoop(_obj, o); 28368889Sjake#ifdef ASSERT 28444510Swollman for (int i = 0; i < _bytes_to_copy; i++) { 28544510Swollman address ptr = (address)(_pc_start + i); 28644510Swollman int a_byte = (*ptr) & 0xFF; 28744510Swollman assert(a_byte == *start++, "should be the same code"); 28850673Sjlemon } 28968889Sjake#endif 29044510Swollman } else { 29144510Swollman // make a copy the code which is going to be patched. 29244510Swollman for ( int i = 0; i < _bytes_to_copy; i++) { 29350673Sjlemon address ptr = (address)(_pc_start + i); 29444510Swollman int a_byte = (*ptr) & 0xFF; 29544510Swollman __ a_byte (a_byte); 29644510Swollman *ptr = 0x90; // make the site look like a nop 29744510Swollman } 29844510Swollman } 29944510Swollman 30044510Swollman address end_of_patch = __ pc(); 30144510Swollman int bytes_to_skip = 0; 30244510Swollman if (_id == load_klass_id) { 30344510Swollman int offset = __ offset(); 30468889Sjake if (CommentedAssembly) { 30544510Swollman __ block_comment(" being_initialized check"); 30644510Swollman } 30744510Swollman assert(_obj != noreg, "must be a valid register"); 30844510Swollman Register tmp = rax; 30969147Sjlemon if (_obj == tmp) tmp = rbx; 31044510Swollman __ push(tmp); 31169147Sjlemon __ get_thread(tmp); 31244510Swollman __ cmpptr(tmp, Address(_obj, instanceKlass::init_thread_offset_in_bytes() + sizeof(klassOopDesc))); 31344527Swollman __ pop(tmp); 31469147Sjlemon __ jcc(Assembler::notEqual, call_patch); 31569147Sjlemon 31644510Swollman // access_field patches may execute the patched code before it's 31744510Swollman // copied back into place so we need to jump back into the main 31831950Snate // code of the nmethod to continue execution. 31931950Snate __ jmp(_patch_site_continuation); 32031950Snate 32131950Snate // make sure this extra code gets skipped 32231950Snate bytes_to_skip += __ offset() - offset; 32331950Snate } 32431950Snate if (CommentedAssembly) { 32531950Snate __ block_comment("patch data encoded as movl"); 32631950Snate } 32731950Snate // Now emit the patch record telling the runtime how to find the 32831950Snate // pieces of the patch. We only need 3 bytes but for readability of 32931950Snate // the disassembly we make the data look like a movl reg, imm32, 33031950Snate // which requires 5 bytes 33131950Snate int sizeof_patch_record = 5; 33231950Snate bytes_to_skip += sizeof_patch_record; 33331950Snate 33431950Snate // emit the offsets needed to find the code to patch 33531950Snate int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record; 33631950Snate 33731950Snate __ a_byte(0xB8); 33831950Snate __ a_byte(0); 33931950Snate __ a_byte(being_initialized_entry_offset); 34031950Snate __ a_byte(bytes_to_skip); 34131950Snate __ a_byte(_bytes_to_copy); 34231950Snate address patch_info_pc = __ pc(); 34331950Snate assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info"); 34436127Sbde 34531950Snate address entry = __ pc(); 34631950Snate NativeGeneralJump::insert_unconditional((address)_pc_start, entry); 34731950Snate address target = NULL; 34831950Snate switch (_id) { 34931950Snate case access_field_id: target = Runtime1::entry_for(Runtime1::access_field_patching_id); break; 35031950Snate case load_klass_id: target = Runtime1::entry_for(Runtime1::load_klass_patching_id); break; 35131950Snate default: ShouldNotReachHere(); 35231950Snate } 35331950Snate __ bind(call_patch); 35431950Snate 35531950Snate if (CommentedAssembly) { 35631950Snate __ block_comment("patch entry point"); 35731950Snate } 35831950Snate __ call(RuntimeAddress(target)); 35931950Snate assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change"); 36031950Snate ce->add_call_info_here(_info); 36131950Snate int jmp_off = __ offset(); 36231950Snate __ jmp(_patch_site_entry); 36331950Snate // Add enough nops so deoptimization can overwrite the jmp above with a call 36431950Snate // and not destroy the world. 36531950Snate for (int j = __ offset() ; j < jmp_off + 5 ; j++ ) { 36631950Snate __ nop(); 36731950Snate } 36831950Snate if (_id == load_klass_id) { 36968889Sjake CodeSection* cs = __ code_section(); 37031950Snate RelocIterator iter(cs, (address)_pc_start, (address)(_pc_start + 1)); 37131950Snate relocInfo::change_reloc_info_for_address(&iter, (address) _pc_start, relocInfo::oop_type, relocInfo::none); 37231950Snate } 37331950Snate} 37431950Snate 37531950Snate 37631950Snatevoid DeoptimizeStub::emit_code(LIR_Assembler* ce) { 37731950Snate __ bind(_entry); 37831950Snate __ call(RuntimeAddress(SharedRuntime::deopt_blob()->unpack_with_reexecution())); 37931950Snate ce->add_call_info_here(_info); 38068889Sjake debug_only(__ should_not_reach_here()); 38131950Snate} 38231950Snate 38331950Snate 38431950Snatevoid ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) { 38531950Snate ce->compilation()->implicit_exception_table()->append(_offset, __ offset()); 386 __ bind(_entry); 387 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id))); 388 ce->add_call_info_here(_info); 389 debug_only(__ should_not_reach_here()); 390} 391 392 393void SimpleExceptionStub::emit_code(LIR_Assembler* ce) { 394 assert(__ rsp_offset() == 0, "frame size should be fixed"); 395 396 __ bind(_entry); 397 // pass the object on stack because all registers must be preserved 398 if (_obj->is_cpu_register()) { 399 ce->store_parameter(_obj->as_register(), 0); 400 } 401 __ call(RuntimeAddress(Runtime1::entry_for(_stub))); 402 ce->add_call_info_here(_info); 403 debug_only(__ should_not_reach_here()); 404} 405 406 407ArrayStoreExceptionStub::ArrayStoreExceptionStub(CodeEmitInfo* info): 408 _info(info) { 409} 410 411 412void ArrayStoreExceptionStub::emit_code(LIR_Assembler* ce) { 413 assert(__ rsp_offset() == 0, "frame size should be fixed"); 414 __ bind(_entry); 415 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_array_store_exception_id))); 416 ce->add_call_info_here(_info); 417 debug_only(__ should_not_reach_here()); 418} 419 420 421void ArrayCopyStub::emit_code(LIR_Assembler* ce) { 422 //---------------slow case: call to native----------------- 423 __ bind(_entry); 424 // Figure out where the args should go 425 // This should really convert the IntrinsicID to the methodOop and signature 426 // but I don't know how to do that. 427 // 428 VMRegPair args[5]; 429 BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT}; 430 SharedRuntime::java_calling_convention(signature, args, 5, true); 431 432 // push parameters 433 // (src, src_pos, dest, destPos, length) 434 Register r[5]; 435 r[0] = src()->as_register(); 436 r[1] = src_pos()->as_register(); 437 r[2] = dst()->as_register(); 438 r[3] = dst_pos()->as_register(); 439 r[4] = length()->as_register(); 440 441 // next registers will get stored on the stack 442 for (int i = 0; i < 5 ; i++ ) { 443 VMReg r_1 = args[i].first(); 444 if (r_1->is_stack()) { 445 int st_off = r_1->reg2stack() * wordSize; 446 __ movptr (Address(rsp, st_off), r[i]); 447 } else { 448 assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg "); 449 } 450 } 451 452 ce->align_call(lir_static_call); 453 454 ce->emit_static_call_stub(); 455 AddressLiteral resolve(SharedRuntime::get_resolve_static_call_stub(), 456 relocInfo::static_call_type); 457 __ call(resolve); 458 ce->add_call_info_here(info()); 459 460#ifndef PRODUCT 461 __ incrementl(ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt)); 462#endif 463 464 __ jmp(_continuation); 465} 466 467///////////////////////////////////////////////////////////////////////////// 468#ifndef SERIALGC 469 470void G1PreBarrierStub::emit_code(LIR_Assembler* ce) { 471 472 // At this point we know that marking is in progress 473 474 __ bind(_entry); 475 assert(pre_val()->is_register(), "Precondition."); 476 477 Register pre_val_reg = pre_val()->as_register(); 478 479 ce->mem2reg(addr(), pre_val(), T_OBJECT, patch_code(), info(), false); 480 481 __ cmpptr(pre_val_reg, (int32_t) NULL_WORD); 482 __ jcc(Assembler::equal, _continuation); 483 ce->store_parameter(pre_val()->as_register(), 0); 484 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_pre_barrier_slow_id))); 485 __ jmp(_continuation); 486 487} 488 489jbyte* G1PostBarrierStub::_byte_map_base = NULL; 490 491jbyte* G1PostBarrierStub::byte_map_base_slow() { 492 BarrierSet* bs = Universe::heap()->barrier_set(); 493 assert(bs->is_a(BarrierSet::G1SATBCTLogging), 494 "Must be if we're using this."); 495 return ((G1SATBCardTableModRefBS*)bs)->byte_map_base; 496} 497 498void G1PostBarrierStub::emit_code(LIR_Assembler* ce) { 499 __ bind(_entry); 500 assert(addr()->is_register(), "Precondition."); 501 assert(new_val()->is_register(), "Precondition."); 502 Register new_val_reg = new_val()->as_register(); 503 __ cmpptr(new_val_reg, (int32_t) NULL_WORD); 504 __ jcc(Assembler::equal, _continuation); 505 ce->store_parameter(addr()->as_register(), 0); 506 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_post_barrier_slow_id))); 507 __ jmp(_continuation); 508} 509 510#endif // SERIALGC 511///////////////////////////////////////////////////////////////////////////// 512 513#undef __ 514