11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "asm/assembler.hpp"
26 #include "asm/assembler.inline.hpp"
27 #include "code/aotCodeCache.hpp"
28 #include "code/compiledIC.hpp"
29 #include "compiler/compiler_globals.hpp"
30 #include "compiler/disassembler.hpp"
31 #include "crc32c.h"
32 #include "gc/shared/barrierSet.hpp"
33 #include "gc/shared/barrierSetAssembler.hpp"
34 #include "gc/shared/collectedHeap.inline.hpp"
35 #include "gc/shared/tlab_globals.hpp"
36 #include "interpreter/bytecodeHistogram.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "interpreter/interpreterRuntime.hpp"
39 #include "jvm.h"
40 #include "memory/resourceArea.hpp"
41 #include "memory/universe.hpp"
42 #include "oops/accessDecorators.hpp"
43 #include "oops/compressedKlass.inline.hpp"
44 #include "oops/compressedOops.inline.hpp"
45 #include "oops/klass.inline.hpp"
46 #include "prims/methodHandles.hpp"
47 #include "runtime/continuation.hpp"
48 #include "runtime/interfaceSupport.inline.hpp"
49 #include "runtime/javaThread.hpp"
50 #include "runtime/jniHandles.hpp"
51 #include "runtime/objectMonitor.hpp"
52 #include "runtime/os.hpp"
53 #include "runtime/safepoint.hpp"
54 #include "runtime/safepointMechanism.hpp"
55 #include "runtime/sharedRuntime.hpp"
56 #include "runtime/stubRoutines.hpp"
57 #include "utilities/checkedCast.hpp"
58 #include "utilities/macros.hpp"
59
60 #ifdef PRODUCT
61 #define BLOCK_COMMENT(str) /* nothing */
62 #define STOP(error) stop(error)
63 #else
64 #define BLOCK_COMMENT(str) block_comment(str)
65 #define STOP(error) block_comment(error); stop(error)
66 #endif
67
68 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
69
70 #ifdef ASSERT
71 bool AbstractAssembler::pd_check_instruction_mark() { return true; }
72 #endif
73
74 static const Assembler::Condition reverse[] = {
75 Assembler::noOverflow /* overflow = 0x0 */ ,
76 Assembler::overflow /* noOverflow = 0x1 */ ,
77 Assembler::aboveEqual /* carrySet = 0x2, below = 0x2 */ ,
78 Assembler::below /* aboveEqual = 0x3, carryClear = 0x3 */ ,
1283 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2) {
1284 assert_different_registers(arg_0, c_rarg1, c_rarg2);
1285 assert_different_registers(arg_1, c_rarg2);
1286 pass_arg2(this, arg_2);
1287 pass_arg1(this, arg_1);
1288 pass_arg0(this, arg_0);
1289 call_VM_leaf(entry_point, 3);
1290 }
1291
1292 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2, Register arg_3) {
1293 assert_different_registers(arg_0, c_rarg1, c_rarg2, c_rarg3);
1294 assert_different_registers(arg_1, c_rarg2, c_rarg3);
1295 assert_different_registers(arg_2, c_rarg3);
1296 pass_arg3(this, arg_3);
1297 pass_arg2(this, arg_2);
1298 pass_arg1(this, arg_1);
1299 pass_arg0(this, arg_0);
1300 call_VM_leaf(entry_point, 3);
1301 }
1302
1303 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0) {
1304 pass_arg0(this, arg_0);
1305 MacroAssembler::call_VM_leaf_base(entry_point, 1);
1306 }
1307
1308 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1) {
1309 assert_different_registers(arg_0, c_rarg1);
1310 pass_arg1(this, arg_1);
1311 pass_arg0(this, arg_0);
1312 MacroAssembler::call_VM_leaf_base(entry_point, 2);
1313 }
1314
1315 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2) {
1316 assert_different_registers(arg_0, c_rarg1, c_rarg2);
1317 assert_different_registers(arg_1, c_rarg2);
1318 pass_arg2(this, arg_2);
1319 pass_arg1(this, arg_1);
1320 pass_arg0(this, arg_0);
1321 MacroAssembler::call_VM_leaf_base(entry_point, 3);
1322 }
2354 lea(rscratch, src);
2355 Assembler::mulss(dst, Address(rscratch, 0));
2356 }
2357 }
2358
2359 void MacroAssembler::null_check(Register reg, int offset) {
2360 if (needs_explicit_null_check(offset)) {
2361 // provoke OS null exception if reg is null by
2362 // accessing M[reg] w/o changing any (non-CC) registers
2363 // NOTE: cmpl is plenty here to provoke a segv
2364 cmpptr(rax, Address(reg, 0));
2365 // Note: should probably use testl(rax, Address(reg, 0));
2366 // may be shorter code (however, this version of
2367 // testl needs to be implemented first)
2368 } else {
2369 // nothing to do, (later) access of M[reg + offset]
2370 // will provoke OS null exception if reg is null
2371 }
2372 }
2373
2374 void MacroAssembler::os_breakpoint() {
2375 // instead of directly emitting a breakpoint, call os:breakpoint for better debugability
2376 // (e.g., MSVC can't call ps() otherwise)
2377 call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint)));
2378 }
2379
2380 void MacroAssembler::unimplemented(const char* what) {
2381 const char* buf = nullptr;
2382 {
2383 ResourceMark rm;
2384 stringStream ss;
2385 ss.print("unimplemented: %s", what);
2386 buf = code_string(ss.as_string());
2387 }
2388 stop(buf);
2389 }
2390
2391 #define XSTATE_BV 0x200
2392
2393 void MacroAssembler::pop_CPU_state() {
3480 }
3481
3482 // C++ bool manipulation
3483 void MacroAssembler::testbool(Register dst) {
3484 if(sizeof(bool) == 1)
3485 testb(dst, 0xff);
3486 else if(sizeof(bool) == 2) {
3487 // testw implementation needed for two byte bools
3488 ShouldNotReachHere();
3489 } else if(sizeof(bool) == 4)
3490 testl(dst, dst);
3491 else
3492 // unsupported
3493 ShouldNotReachHere();
3494 }
3495
3496 void MacroAssembler::testptr(Register dst, Register src) {
3497 testq(dst, src);
3498 }
3499
3500 // Defines obj, preserves var_size_in_bytes, okay for t2 == var_size_in_bytes.
3501 void MacroAssembler::tlab_allocate(Register obj,
3502 Register var_size_in_bytes,
3503 int con_size_in_bytes,
3504 Register t1,
3505 Register t2,
3506 Label& slow_case) {
3507 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
3508 bs->tlab_allocate(this, obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
3509 }
3510
3511 RegSet MacroAssembler::call_clobbered_gp_registers() {
3512 RegSet regs;
3513 regs += RegSet::of(rax, rcx, rdx);
3514 #ifndef _WINDOWS
3515 regs += RegSet::of(rsi, rdi);
3516 #endif
3517 regs += RegSet::range(r8, r11);
3518 if (UseAPX) {
3519 regs += RegSet::range(r16, as_Register(Register::number_of_registers - 1));
3683 xorptr(temp, temp); // use _zero reg to clear memory (shorter code)
3684 if (UseIncDec) {
3685 shrptr(index, 3); // divide by 8/16 and set carry flag if bit 2 was set
3686 } else {
3687 shrptr(index, 2); // use 2 instructions to avoid partial flag stall
3688 shrptr(index, 1);
3689 }
3690
3691 // initialize remaining object fields: index is a multiple of 2 now
3692 {
3693 Label loop;
3694 bind(loop);
3695 movptr(Address(address, index, Address::times_8, offset_in_bytes - 1*BytesPerWord), temp);
3696 decrement(index);
3697 jcc(Assembler::notZero, loop);
3698 }
3699
3700 bind(done);
3701 }
3702
3703 // Look up the method for a megamorphic invokeinterface call.
3704 // The target method is determined by <intf_klass, itable_index>.
3705 // The receiver klass is in recv_klass.
3706 // On success, the result will be in method_result, and execution falls through.
3707 // On failure, execution transfers to the given label.
3708 void MacroAssembler::lookup_interface_method(Register recv_klass,
3709 Register intf_klass,
3710 RegisterOrConstant itable_index,
3711 Register method_result,
3712 Register scan_temp,
3713 Label& L_no_such_interface,
3714 bool return_method) {
3715 assert_different_registers(recv_klass, intf_klass, scan_temp);
3716 assert_different_registers(method_result, intf_klass, scan_temp);
3717 assert(recv_klass != method_result || !return_method,
3718 "recv_klass can be destroyed when method isn't needed");
3719
3720 assert(itable_index.is_constant() || itable_index.as_register() == method_result,
3721 "caller must use same register for non-constant itable index as for method");
3722
4733 } else {
4734 Label L;
4735 jccb(negate_condition(cc), L);
4736 movl(dst, src);
4737 bind(L);
4738 }
4739 }
4740
4741 void MacroAssembler::cmov32(Condition cc, Register dst, Register src) {
4742 if (VM_Version::supports_cmov()) {
4743 cmovl(cc, dst, src);
4744 } else {
4745 Label L;
4746 jccb(negate_condition(cc), L);
4747 movl(dst, src);
4748 bind(L);
4749 }
4750 }
4751
4752 void MacroAssembler::_verify_oop(Register reg, const char* s, const char* file, int line) {
4753 if (!VerifyOops) return;
4754
4755 BLOCK_COMMENT("verify_oop {");
4756 push(rscratch1);
4757 push(rax); // save rax
4758 push(reg); // pass register argument
4759
4760 // Pass register number to verify_oop_subroutine
4761 const char* b = nullptr;
4762 {
4763 ResourceMark rm;
4764 stringStream ss;
4765 ss.print("verify_oop: %s: %s (%s:%d)", reg->name(), s, file, line);
4766 b = code_string(ss.as_string());
4767 }
4768 AddressLiteral buffer((address) b, external_word_Relocation::spec_for_immediate());
4769 pushptr(buffer.addr(), rscratch1);
4770
4771 // call indirectly to solve generation ordering problem
4772 movptr(rax, ExternalAddress(StubRoutines::verify_oop_subroutine_entry_address()));
4773 call(rax);
4989 // or something else. Since this is a slow path, we can optimize for code density,
4990 // and just restart the search from the beginning.
4991 jmpb(L_restart);
4992
4993 // Counter updates:
4994
4995 // Increment polymorphic counter instead of receiver slot.
4996 bind(L_polymorphic);
4997 movptr(offset, poly_count_offset);
4998 jmpb(L_count_update);
4999
5000 // Found a receiver, convert its slot offset to corresponding count offset.
5001 bind(L_found_recv);
5002 addptr(offset, receiver_to_count_step);
5003
5004 bind(L_count_update);
5005 addptr(Address(mdp, offset, Address::times_ptr), DataLayout::counter_increment);
5006 }
5007
5008 void MacroAssembler::_verify_oop_addr(Address addr, const char* s, const char* file, int line) {
5009 if (!VerifyOops) return;
5010
5011 push(rscratch1);
5012 push(rax); // save rax,
5013 // addr may contain rsp so we will have to adjust it based on the push
5014 // we just did (and on 64 bit we do two pushes)
5015 // NOTE: 64bit seemed to have had a bug in that it did movq(addr, rax); which
5016 // stores rax into addr which is backwards of what was intended.
5017 if (addr.uses(rsp)) {
5018 lea(rax, addr);
5019 pushptr(Address(rax, 2 * BytesPerWord));
5020 } else {
5021 pushptr(addr);
5022 }
5023
5024 // Pass register number to verify_oop_subroutine
5025 const char* b = nullptr;
5026 {
5027 ResourceMark rm;
5028 stringStream ss;
5029 ss.print("verify_oop_addr: %s (%s:%d)", s, file, line);
5383
5384 void MacroAssembler::load_mirror(Register mirror, Register method, Register tmp) {
5385 // get mirror
5386 const int mirror_offset = in_bytes(Klass::java_mirror_offset());
5387 load_method_holder(mirror, method);
5388 movptr(mirror, Address(mirror, mirror_offset));
5389 resolve_oop_handle(mirror, tmp);
5390 }
5391
5392 void MacroAssembler::load_method_holder_cld(Register rresult, Register rmethod) {
5393 load_method_holder(rresult, rmethod);
5394 movptr(rresult, Address(rresult, InstanceKlass::class_loader_data_offset()));
5395 }
5396
5397 void MacroAssembler::load_method_holder(Register holder, Register method) {
5398 movptr(holder, Address(method, Method::const_offset())); // ConstMethod*
5399 movptr(holder, Address(holder, ConstMethod::constants_offset())); // ConstantPool*
5400 movptr(holder, Address(holder, ConstantPool::pool_holder_offset())); // InstanceKlass*
5401 }
5402
5403 void MacroAssembler::load_narrow_klass_compact(Register dst, Register src) {
5404 assert(UseCompactObjectHeaders, "expect compact object headers");
5405 movq(dst, Address(src, oopDesc::mark_offset_in_bytes()));
5406 shrq(dst, markWord::klass_shift);
5407 }
5408
5409 void MacroAssembler::load_klass(Register dst, Register src, Register tmp) {
5410 assert_different_registers(src, tmp);
5411 assert_different_registers(dst, tmp);
5412
5413 if (UseCompactObjectHeaders) {
5414 load_narrow_klass_compact(dst, src);
5415 decode_klass_not_null(dst, tmp);
5416 } else {
5417 movl(dst, Address(src, oopDesc::klass_offset_in_bytes()));
5418 decode_klass_not_null(dst, tmp);
5419 }
5420 }
5421
5422 void MacroAssembler::store_klass(Register dst, Register src, Register tmp) {
5423 assert(!UseCompactObjectHeaders, "not with compact headers");
5424 assert_different_registers(src, tmp);
5425 assert_different_registers(dst, tmp);
5426 encode_klass_not_null(src, tmp);
5427 movl(Address(dst, oopDesc::klass_offset_in_bytes()), src);
5428 }
5429
5430 void MacroAssembler::cmp_klass(Register klass, Register obj, Register tmp) {
5431 if (UseCompactObjectHeaders) {
5432 assert(tmp != noreg, "need tmp");
5433 assert_different_registers(klass, obj, tmp);
5434 load_narrow_klass_compact(tmp, obj);
5435 cmpl(klass, tmp);
5436 } else {
5437 cmpl(klass, Address(obj, oopDesc::klass_offset_in_bytes()));
5438 }
5439 }
5440
5441 void MacroAssembler::cmp_klasses_from_objects(Register obj1, Register obj2, Register tmp1, Register tmp2) {
5458 bool as_raw = (decorators & AS_RAW) != 0;
5459 if (as_raw) {
5460 bs->BarrierSetAssembler::load_at(this, decorators, type, dst, src, tmp1);
5461 } else {
5462 bs->load_at(this, decorators, type, dst, src, tmp1);
5463 }
5464 }
5465
5466 void MacroAssembler::access_store_at(BasicType type, DecoratorSet decorators, Address dst, Register val,
5467 Register tmp1, Register tmp2, Register tmp3) {
5468 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
5469 decorators = AccessInternal::decorator_fixup(decorators, type);
5470 bool as_raw = (decorators & AS_RAW) != 0;
5471 if (as_raw) {
5472 bs->BarrierSetAssembler::store_at(this, decorators, type, dst, val, tmp1, tmp2, tmp3);
5473 } else {
5474 bs->store_at(this, decorators, type, dst, val, tmp1, tmp2, tmp3);
5475 }
5476 }
5477
5478 void MacroAssembler::load_heap_oop(Register dst, Address src, Register tmp1, DecoratorSet decorators) {
5479 access_load_at(T_OBJECT, IN_HEAP | decorators, dst, src, tmp1);
5480 }
5481
5482 // Doesn't do verification, generates fixed size code
5483 void MacroAssembler::load_heap_oop_not_null(Register dst, Address src, Register tmp1, DecoratorSet decorators) {
5484 access_load_at(T_OBJECT, IN_HEAP | IS_NOT_NULL | decorators, dst, src, tmp1);
5485 }
5486
5487 void MacroAssembler::store_heap_oop(Address dst, Register val, Register tmp1,
5488 Register tmp2, Register tmp3, DecoratorSet decorators) {
5489 access_store_at(T_OBJECT, IN_HEAP | decorators, dst, val, tmp1, tmp2, tmp3);
5490 }
5491
5492 // Used for storing nulls.
5493 void MacroAssembler::store_heap_oop_null(Address dst) {
5494 access_store_at(T_OBJECT, IN_HEAP, dst, noreg, noreg, noreg, noreg);
5495 }
5496
5497 void MacroAssembler::store_klass_gap(Register dst, Register src) {
5806 assert (oop_recorder() != nullptr, "this assembler needs an OopRecorder");
5807 int klass_index = oop_recorder()->find_index(k);
5808 RelocationHolder rspec = metadata_Relocation::spec(klass_index);
5809 Assembler::cmp_narrow_oop(dst, CompressedKlassPointers::encode(k), rspec);
5810 }
5811
5812 void MacroAssembler::reinit_heapbase() {
5813 if (UseCompressedOops) {
5814 if (Universe::heap() != nullptr) {
5815 if (CompressedOops::base() == nullptr) {
5816 MacroAssembler::xorptr(r12_heapbase, r12_heapbase);
5817 } else {
5818 mov64(r12_heapbase, (int64_t)CompressedOops::base());
5819 }
5820 } else {
5821 movptr(r12_heapbase, ExternalAddress(CompressedOops::base_addr()));
5822 }
5823 }
5824 }
5825
5826 #if COMPILER2_OR_JVMCI
5827
5828 // clear memory of size 'cnt' qwords, starting at 'base' using XMM/YMM/ZMM registers
5829 void MacroAssembler::xmm_clear_mem(Register base, Register cnt, Register rtmp, XMMRegister xtmp, KRegister mask) {
5830 // cnt - number of qwords (8-byte words).
5831 // base - start address, qword aligned.
5832 Label L_zero_64_bytes, L_loop, L_sloop, L_tail, L_end;
5833 bool use64byteVector = (MaxVectorSize == 64) && (CopyAVX3Threshold == 0);
5834 if (use64byteVector) {
5835 vpxor(xtmp, xtmp, xtmp, AVX_512bit);
5836 } else if (MaxVectorSize >= 32) {
5837 vpxor(xtmp, xtmp, xtmp, AVX_256bit);
5838 } else {
5839 pxor(xtmp, xtmp);
5840 }
5841 jmp(L_zero_64_bytes);
5842
5843 BIND(L_loop);
5844 if (MaxVectorSize >= 32) {
5845 fill64(base, 0, xtmp, use64byteVector);
5846 } else {
5847 movdqu(Address(base, 0), xtmp);
5848 movdqu(Address(base, 16), xtmp);
5849 movdqu(Address(base, 32), xtmp);
5850 movdqu(Address(base, 48), xtmp);
5851 }
5852 addptr(base, 64);
5853
5854 BIND(L_zero_64_bytes);
5855 subptr(cnt, 8);
5856 jccb(Assembler::greaterEqual, L_loop);
5857
5858 // Copy trailing 64 bytes
5859 if (use64byteVector) {
5860 addptr(cnt, 8);
5861 jccb(Assembler::equal, L_end);
5862 fill64_masked(3, base, 0, xtmp, mask, cnt, rtmp, true);
5863 jmp(L_end);
5864 } else {
5865 addptr(cnt, 4);
5866 jccb(Assembler::less, L_tail);
5867 if (MaxVectorSize >= 32) {
5868 vmovdqu(Address(base, 0), xtmp);
5869 } else {
5870 movdqu(Address(base, 0), xtmp);
5871 movdqu(Address(base, 16), xtmp);
5872 }
5873 }
5874 addptr(base, 32);
5875 subptr(cnt, 4);
5876
5877 BIND(L_tail);
5878 addptr(cnt, 4);
5879 jccb(Assembler::lessEqual, L_end);
5880 if (UseAVX > 2 && MaxVectorSize >= 32 && VM_Version::supports_avx512vl()) {
5881 fill32_masked(3, base, 0, xtmp, mask, cnt, rtmp);
5882 } else {
5883 decrement(cnt);
5884
5885 BIND(L_sloop);
5886 movq(Address(base, 0), xtmp);
5887 addptr(base, 8);
5888 decrement(cnt);
5889 jccb(Assembler::greaterEqual, L_sloop);
5890 }
5891 BIND(L_end);
5892 }
5893
5894 // Clearing constant sized memory using YMM/ZMM registers.
5895 void MacroAssembler::clear_mem(Register base, int cnt, Register rtmp, XMMRegister xtmp, KRegister mask) {
5896 assert(UseAVX > 2 && VM_Version::supports_avx512vl(), "");
5897 bool use64byteVector = (MaxVectorSize > 32) && (CopyAVX3Threshold == 0);
5898
5899 int vector64_count = (cnt & (~0x7)) >> 3;
5900 cnt = cnt & 0x7;
5901 const int fill64_per_loop = 4;
5963 break;
5964 case 7:
5965 if (use64byteVector) {
5966 movl(rtmp, 0x7F);
5967 kmovwl(mask, rtmp);
5968 evmovdqu(T_LONG, mask, Address(base, disp), xtmp, true, Assembler::AVX_512bit);
5969 } else {
5970 evmovdqu(T_LONG, k0, Address(base, disp), xtmp, false, Assembler::AVX_256bit);
5971 movl(rtmp, 0x7);
5972 kmovwl(mask, rtmp);
5973 evmovdqu(T_LONG, mask, Address(base, disp + 32), xtmp, true, Assembler::AVX_256bit);
5974 }
5975 break;
5976 default:
5977 fatal("Unexpected length : %d\n",cnt);
5978 break;
5979 }
5980 }
5981 }
5982
5983 void MacroAssembler::clear_mem(Register base, Register cnt, Register tmp, XMMRegister xtmp,
5984 bool is_large, KRegister mask) {
5985 // cnt - number of qwords (8-byte words).
5986 // base - start address, qword aligned.
5987 // is_large - if optimizers know cnt is larger than InitArrayShortSize
5988 assert(base==rdi, "base register must be edi for rep stos");
5989 assert(tmp==rax, "tmp register must be eax for rep stos");
5990 assert(cnt==rcx, "cnt register must be ecx for rep stos");
5991 assert(InitArrayShortSize % BytesPerLong == 0,
5992 "InitArrayShortSize should be the multiple of BytesPerLong");
5993
5994 Label DONE;
5995 if (!is_large || !UseXMMForObjInit) {
5996 xorptr(tmp, tmp);
5997 }
5998
5999 if (!is_large) {
6000 Label LOOP, LONG;
6001 cmpptr(cnt, InitArrayShortSize/BytesPerLong);
6002 jccb(Assembler::greater, LONG);
6003
6004 decrement(cnt);
6005 jccb(Assembler::negative, DONE); // Zero length
6006
6007 // Use individual pointer-sized stores for small counts:
6008 BIND(LOOP);
6009 movptr(Address(base, cnt, Address::times_ptr), tmp);
6010 decrement(cnt);
6011 jccb(Assembler::greaterEqual, LOOP);
6012 jmpb(DONE);
6013
6014 BIND(LONG);
6015 }
6016
6017 // Use longer rep-prefixed ops for non-small counts:
6018 if (UseFastStosb) {
6019 shlptr(cnt, 3); // convert to number of bytes
6020 rep_stosb();
6021 } else if (UseXMMForObjInit) {
6022 xmm_clear_mem(base, cnt, tmp, xtmp, mask);
6023 } else {
6024 rep_stos();
6025 }
6026
6027 BIND(DONE);
6028 }
6029
6030 #endif //COMPILER2_OR_JVMCI
6031
6032
6033 void MacroAssembler::generate_fill(BasicType t, bool aligned,
6034 Register to, Register value, Register count,
6035 Register rtmp, XMMRegister xtmp) {
6036 ShortBranchVerifier sbv(this);
6037 assert_different_registers(to, value, count, rtmp);
6038 Label L_exit;
6039 Label L_fill_2_bytes, L_fill_4_bytes;
6040
6041 #if defined(COMPILER2)
6042 if(MaxVectorSize >=32 &&
9921
9922 // Load top.
9923 movl(top, Address(thread, JavaThread::lock_stack_top_offset()));
9924
9925 // Check if the lock-stack is full.
9926 cmpl(top, LockStack::end_offset());
9927 jcc(Assembler::greaterEqual, slow);
9928
9929 // Check for recursion.
9930 cmpptr(obj, Address(thread, top, Address::times_1, -oopSize));
9931 jcc(Assembler::equal, push);
9932
9933 // Check header for monitor (0b10).
9934 testptr(reg_rax, markWord::monitor_value);
9935 jcc(Assembler::notZero, slow);
9936
9937 // Try to lock. Transition lock bits 0b01 => 0b00
9938 movptr(tmp, reg_rax);
9939 andptr(tmp, ~(int32_t)markWord::unlocked_value);
9940 orptr(reg_rax, markWord::unlocked_value);
9941 lock(); cmpxchgptr(tmp, Address(obj, oopDesc::mark_offset_in_bytes()));
9942 jcc(Assembler::notEqual, slow);
9943
9944 // Restore top, CAS clobbers register.
9945 movl(top, Address(thread, JavaThread::lock_stack_top_offset()));
9946
9947 bind(push);
9948 // After successful lock, push object on lock-stack.
9949 movptr(Address(thread, top), obj);
9950 incrementl(top, oopSize);
9951 movl(Address(thread, JavaThread::lock_stack_top_offset()), top);
9952 }
9953
9954 // Implements fast-unlocking.
9955 //
9956 // obj: the object to be unlocked
9957 // reg_rax: rax
9958 // thread: the thread
9959 // tmp: a temporary register
9960 void MacroAssembler::fast_unlock(Register obj, Register reg_rax, Register tmp, Label& slow) {
|
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "asm/assembler.hpp"
26 #include "asm/assembler.inline.hpp"
27 #include "code/aotCodeCache.hpp"
28 #include "code/compiledIC.hpp"
29 #include "compiler/compiler_globals.hpp"
30 #include "compiler/disassembler.hpp"
31 #include "ci/ciInlineKlass.hpp"
32 #include "crc32c.h"
33 #include "gc/shared/barrierSet.hpp"
34 #include "gc/shared/barrierSetAssembler.hpp"
35 #include "gc/shared/collectedHeap.inline.hpp"
36 #include "gc/shared/tlab_globals.hpp"
37 #include "interpreter/bytecodeHistogram.hpp"
38 #include "interpreter/interpreter.hpp"
39 #include "interpreter/interpreterRuntime.hpp"
40 #include "jvm.h"
41 #include "memory/resourceArea.hpp"
42 #include "memory/universe.hpp"
43 #include "oops/accessDecorators.hpp"
44 #include "oops/compressedKlass.inline.hpp"
45 #include "oops/compressedOops.inline.hpp"
46 #include "oops/klass.inline.hpp"
47 #include "oops/resolvedFieldEntry.hpp"
48 #include "prims/methodHandles.hpp"
49 #include "runtime/arguments.hpp"
50 #include "runtime/continuation.hpp"
51 #include "runtime/interfaceSupport.inline.hpp"
52 #include "runtime/javaThread.hpp"
53 #include "runtime/jniHandles.hpp"
54 #include "runtime/objectMonitor.hpp"
55 #include "runtime/os.hpp"
56 #include "runtime/safepoint.hpp"
57 #include "runtime/safepointMechanism.hpp"
58 #include "runtime/sharedRuntime.hpp"
59 #include "runtime/signature_cc.hpp"
60 #include "runtime/stubRoutines.hpp"
61 #include "utilities/checkedCast.hpp"
62 #include "utilities/macros.hpp"
63 #include "vmreg_x86.inline.hpp"
64 #ifdef COMPILER2
65 #include "opto/output.hpp"
66 #endif
67
68 #ifdef PRODUCT
69 #define BLOCK_COMMENT(str) /* nothing */
70 #define STOP(error) stop(error)
71 #else
72 #define BLOCK_COMMENT(str) block_comment(str)
73 #define STOP(error) block_comment(error); stop(error)
74 #endif
75
76 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
77
78 #ifdef ASSERT
79 bool AbstractAssembler::pd_check_instruction_mark() { return true; }
80 #endif
81
82 static const Assembler::Condition reverse[] = {
83 Assembler::noOverflow /* overflow = 0x0 */ ,
84 Assembler::overflow /* noOverflow = 0x1 */ ,
85 Assembler::aboveEqual /* carrySet = 0x2, below = 0x2 */ ,
86 Assembler::below /* aboveEqual = 0x3, carryClear = 0x3 */ ,
1291 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2) {
1292 assert_different_registers(arg_0, c_rarg1, c_rarg2);
1293 assert_different_registers(arg_1, c_rarg2);
1294 pass_arg2(this, arg_2);
1295 pass_arg1(this, arg_1);
1296 pass_arg0(this, arg_0);
1297 call_VM_leaf(entry_point, 3);
1298 }
1299
1300 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2, Register arg_3) {
1301 assert_different_registers(arg_0, c_rarg1, c_rarg2, c_rarg3);
1302 assert_different_registers(arg_1, c_rarg2, c_rarg3);
1303 assert_different_registers(arg_2, c_rarg3);
1304 pass_arg3(this, arg_3);
1305 pass_arg2(this, arg_2);
1306 pass_arg1(this, arg_1);
1307 pass_arg0(this, arg_0);
1308 call_VM_leaf(entry_point, 3);
1309 }
1310
1311 void MacroAssembler::super_call_VM_leaf(address entry_point) {
1312 MacroAssembler::call_VM_leaf_base(entry_point, 1);
1313 }
1314
1315 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0) {
1316 pass_arg0(this, arg_0);
1317 MacroAssembler::call_VM_leaf_base(entry_point, 1);
1318 }
1319
1320 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1) {
1321 assert_different_registers(arg_0, c_rarg1);
1322 pass_arg1(this, arg_1);
1323 pass_arg0(this, arg_0);
1324 MacroAssembler::call_VM_leaf_base(entry_point, 2);
1325 }
1326
1327 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2) {
1328 assert_different_registers(arg_0, c_rarg1, c_rarg2);
1329 assert_different_registers(arg_1, c_rarg2);
1330 pass_arg2(this, arg_2);
1331 pass_arg1(this, arg_1);
1332 pass_arg0(this, arg_0);
1333 MacroAssembler::call_VM_leaf_base(entry_point, 3);
1334 }
2366 lea(rscratch, src);
2367 Assembler::mulss(dst, Address(rscratch, 0));
2368 }
2369 }
2370
2371 void MacroAssembler::null_check(Register reg, int offset) {
2372 if (needs_explicit_null_check(offset)) {
2373 // provoke OS null exception if reg is null by
2374 // accessing M[reg] w/o changing any (non-CC) registers
2375 // NOTE: cmpl is plenty here to provoke a segv
2376 cmpptr(rax, Address(reg, 0));
2377 // Note: should probably use testl(rax, Address(reg, 0));
2378 // may be shorter code (however, this version of
2379 // testl needs to be implemented first)
2380 } else {
2381 // nothing to do, (later) access of M[reg + offset]
2382 // will provoke OS null exception if reg is null
2383 }
2384 }
2385
2386 void MacroAssembler::test_markword_is_inline_type(Register markword, Label& is_inline_type) {
2387 andptr(markword, markWord::inline_type_pattern_mask);
2388 cmpptr(markword, markWord::inline_type_pattern);
2389 jcc(Assembler::equal, is_inline_type);
2390 }
2391
2392 void MacroAssembler::test_oop_is_not_inline_type(Register object, Register tmp, Label& not_inline_type, bool can_be_null) {
2393 if (can_be_null) {
2394 testptr(object, object);
2395 jcc(Assembler::zero, not_inline_type);
2396 }
2397 const int is_inline_type_mask = markWord::inline_type_pattern;
2398 movptr(tmp, Address(object, oopDesc::mark_offset_in_bytes()));
2399 andptr(tmp, is_inline_type_mask);
2400 cmpptr(tmp, is_inline_type_mask);
2401 jcc(Assembler::notEqual, not_inline_type);
2402 }
2403
2404 void MacroAssembler::test_field_is_null_free_inline_type(Register flags, Register temp_reg, Label& is_null_free_inline_type) {
2405 movl(temp_reg, flags);
2406 testl(temp_reg, 1 << ResolvedFieldEntry::is_null_free_inline_type_shift);
2407 jcc(Assembler::notEqual, is_null_free_inline_type);
2408 }
2409
2410 void MacroAssembler::test_field_is_not_null_free_inline_type(Register flags, Register temp_reg, Label& not_null_free_inline_type) {
2411 movl(temp_reg, flags);
2412 testl(temp_reg, 1 << ResolvedFieldEntry::is_null_free_inline_type_shift);
2413 jcc(Assembler::equal, not_null_free_inline_type);
2414 }
2415
2416 void MacroAssembler::test_field_is_flat(Register flags, Register temp_reg, Label& is_flat) {
2417 movl(temp_reg, flags);
2418 testl(temp_reg, 1 << ResolvedFieldEntry::is_flat_shift);
2419 jcc(Assembler::notEqual, is_flat);
2420 }
2421
2422 void MacroAssembler::test_field_has_null_marker(Register flags, Register temp_reg, Label& has_null_marker) {
2423 movl(temp_reg, flags);
2424 testl(temp_reg, 1 << ResolvedFieldEntry::has_null_marker_shift);
2425 jcc(Assembler::notEqual, has_null_marker);
2426 }
2427
2428 void MacroAssembler::test_oop_prototype_bit(Register oop, Register temp_reg, int32_t test_bit, bool jmp_set, Label& jmp_label) {
2429 Label test_mark_word;
2430 // load mark word
2431 movptr(temp_reg, Address(oop, oopDesc::mark_offset_in_bytes()));
2432 // check displaced
2433 testl(temp_reg, markWord::unlocked_value);
2434 jccb(Assembler::notZero, test_mark_word);
2435 // slow path use klass prototype
2436 push(rscratch1);
2437 load_prototype_header(temp_reg, oop, rscratch1);
2438 pop(rscratch1);
2439
2440 bind(test_mark_word);
2441 testl(temp_reg, test_bit);
2442 jcc((jmp_set) ? Assembler::notZero : Assembler::zero, jmp_label);
2443 }
2444
2445 void MacroAssembler::test_flat_array_oop(Register oop, Register temp_reg,
2446 Label& is_flat_array) {
2447 #ifdef _LP64
2448 test_oop_prototype_bit(oop, temp_reg, markWord::flat_array_bit_in_place, true, is_flat_array);
2449 #else
2450 load_klass(temp_reg, oop, noreg);
2451 movl(temp_reg, Address(temp_reg, Klass::layout_helper_offset()));
2452 test_flat_array_layout(temp_reg, is_flat_array);
2453 #endif
2454 }
2455
2456 void MacroAssembler::test_non_flat_array_oop(Register oop, Register temp_reg,
2457 Label& is_non_flat_array) {
2458 #ifdef _LP64
2459 test_oop_prototype_bit(oop, temp_reg, markWord::flat_array_bit_in_place, false, is_non_flat_array);
2460 #else
2461 load_klass(temp_reg, oop, noreg);
2462 movl(temp_reg, Address(temp_reg, Klass::layout_helper_offset()));
2463 test_non_flat_array_layout(temp_reg, is_non_flat_array);
2464 #endif
2465 }
2466
2467 void MacroAssembler::test_null_free_array_oop(Register oop, Register temp_reg, Label&is_null_free_array) {
2468 #ifdef _LP64
2469 test_oop_prototype_bit(oop, temp_reg, markWord::null_free_array_bit_in_place, true, is_null_free_array);
2470 #else
2471 Unimplemented();
2472 #endif
2473 }
2474
2475 void MacroAssembler::test_non_null_free_array_oop(Register oop, Register temp_reg, Label&is_non_null_free_array) {
2476 #ifdef _LP64
2477 test_oop_prototype_bit(oop, temp_reg, markWord::null_free_array_bit_in_place, false, is_non_null_free_array);
2478 #else
2479 Unimplemented();
2480 #endif
2481 }
2482
2483 void MacroAssembler::test_flat_array_layout(Register lh, Label& is_flat_array) {
2484 testl(lh, Klass::_lh_array_tag_flat_value_bit_inplace);
2485 jcc(Assembler::notZero, is_flat_array);
2486 }
2487
2488 void MacroAssembler::test_non_flat_array_layout(Register lh, Label& is_non_flat_array) {
2489 testl(lh, Klass::_lh_array_tag_flat_value_bit_inplace);
2490 jcc(Assembler::zero, is_non_flat_array);
2491 }
2492
2493 void MacroAssembler::os_breakpoint() {
2494 // instead of directly emitting a breakpoint, call os:breakpoint for better debugability
2495 // (e.g., MSVC can't call ps() otherwise)
2496 call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint)));
2497 }
2498
2499 void MacroAssembler::unimplemented(const char* what) {
2500 const char* buf = nullptr;
2501 {
2502 ResourceMark rm;
2503 stringStream ss;
2504 ss.print("unimplemented: %s", what);
2505 buf = code_string(ss.as_string());
2506 }
2507 stop(buf);
2508 }
2509
2510 #define XSTATE_BV 0x200
2511
2512 void MacroAssembler::pop_CPU_state() {
3599 }
3600
3601 // C++ bool manipulation
3602 void MacroAssembler::testbool(Register dst) {
3603 if(sizeof(bool) == 1)
3604 testb(dst, 0xff);
3605 else if(sizeof(bool) == 2) {
3606 // testw implementation needed for two byte bools
3607 ShouldNotReachHere();
3608 } else if(sizeof(bool) == 4)
3609 testl(dst, dst);
3610 else
3611 // unsupported
3612 ShouldNotReachHere();
3613 }
3614
3615 void MacroAssembler::testptr(Register dst, Register src) {
3616 testq(dst, src);
3617 }
3618
3619 // Object / value buffer allocation...
3620 //
3621 // Kills klass and rsi on LP64
3622 void MacroAssembler::allocate_instance(Register klass, Register new_obj,
3623 Register t1, Register t2,
3624 bool clear_fields, Label& alloc_failed)
3625 {
3626 Label done, initialize_header, initialize_object, slow_case, slow_case_no_pop;
3627 Register layout_size = t1;
3628 assert(new_obj == rax, "needs to be rax");
3629 assert_different_registers(klass, new_obj, t1, t2);
3630
3631 // get instance_size in InstanceKlass (scaled to a count of bytes)
3632 movl(layout_size, Address(klass, Klass::layout_helper_offset()));
3633 // test to see if it is malformed in some way
3634 testl(layout_size, Klass::_lh_instance_slow_path_bit);
3635 jcc(Assembler::notZero, slow_case_no_pop);
3636
3637 // Allocate the instance:
3638 // If TLAB is enabled:
3639 // Try to allocate in the TLAB.
3640 // If fails, go to the slow path.
3641 // Else If inline contiguous allocations are enabled:
3642 // Try to allocate in eden.
3643 // If fails due to heap end, go to slow path.
3644 //
3645 // If TLAB is enabled OR inline contiguous is enabled:
3646 // Initialize the allocation.
3647 // Exit.
3648 //
3649 // Go to slow path.
3650
3651 push(klass);
3652 if (UseTLAB) {
3653 tlab_allocate(new_obj, layout_size, 0, klass, t2, slow_case);
3654 if (ZeroTLAB || (!clear_fields)) {
3655 // the fields have been already cleared
3656 jmp(initialize_header);
3657 } else {
3658 // initialize both the header and fields
3659 jmp(initialize_object);
3660 }
3661 } else {
3662 jmp(slow_case);
3663 }
3664
3665 // If UseTLAB is true, the object is created above and there is an initialize need.
3666 // Otherwise, skip and go to the slow path.
3667 if (UseTLAB) {
3668 if (clear_fields) {
3669 // The object is initialized before the header. If the object size is
3670 // zero, go directly to the header initialization.
3671 bind(initialize_object);
3672 if (UseCompactObjectHeaders) {
3673 assert(is_aligned(oopDesc::base_offset_in_bytes(), BytesPerLong), "oop base offset must be 8-byte-aligned");
3674 decrement(layout_size, oopDesc::base_offset_in_bytes());
3675 } else {
3676 decrement(layout_size, sizeof(oopDesc));
3677 }
3678 jcc(Assembler::zero, initialize_header);
3679
3680 // Initialize topmost object field, divide size by 8, check if odd and
3681 // test if zero.
3682 Register zero = klass;
3683 xorl(zero, zero); // use zero reg to clear memory (shorter code)
3684 shrl(layout_size, LogBytesPerLong); // divide by 2*oopSize and set carry flag if odd
3685
3686 #ifdef ASSERT
3687 // make sure instance_size was multiple of 8
3688 Label L;
3689 // Ignore partial flag stall after shrl() since it is debug VM
3690 jcc(Assembler::carryClear, L);
3691 stop("object size is not multiple of 2 - adjust this code");
3692 bind(L);
3693 // must be > 0, no extra check needed here
3694 #endif
3695
3696 // initialize remaining object fields: instance_size was a multiple of 8
3697 {
3698 Label loop;
3699 bind(loop);
3700 int header_size_bytes = oopDesc::header_size() * HeapWordSize;
3701 assert(is_aligned(header_size_bytes, BytesPerLong), "oop header size must be 8-byte-aligned");
3702 movptr(Address(new_obj, layout_size, Address::times_8, header_size_bytes - 1*oopSize), zero);
3703 decrement(layout_size);
3704 jcc(Assembler::notZero, loop);
3705 }
3706 } // clear_fields
3707
3708 // initialize object header only.
3709 bind(initialize_header);
3710 if (UseCompactObjectHeaders || Arguments::is_valhalla_enabled()) {
3711 pop(klass);
3712 Register mark_word = t2;
3713 movptr(mark_word, Address(klass, Klass::prototype_header_offset()));
3714 movptr(Address(new_obj, oopDesc::mark_offset_in_bytes ()), mark_word);
3715 } else {
3716 movptr(Address(new_obj, oopDesc::mark_offset_in_bytes()),
3717 (intptr_t)markWord::prototype().value()); // header
3718 pop(klass); // get saved klass back in the register.
3719 }
3720 if (!UseCompactObjectHeaders) {
3721 xorl(rsi, rsi); // use zero reg to clear memory (shorter code)
3722 store_klass_gap(new_obj, rsi); // zero klass gap for compressed oops
3723 movptr(t2, klass); // preserve klass
3724 store_klass(new_obj, t2, rscratch1); // src klass reg is potentially compressed
3725 }
3726 jmp(done);
3727 }
3728
3729 bind(slow_case);
3730 pop(klass);
3731 bind(slow_case_no_pop);
3732 jmp(alloc_failed);
3733
3734 bind(done);
3735 }
3736
3737 // Defines obj, preserves var_size_in_bytes, okay for t2 == var_size_in_bytes.
3738 void MacroAssembler::tlab_allocate(Register obj,
3739 Register var_size_in_bytes,
3740 int con_size_in_bytes,
3741 Register t1,
3742 Register t2,
3743 Label& slow_case) {
3744 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
3745 bs->tlab_allocate(this, obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
3746 }
3747
3748 RegSet MacroAssembler::call_clobbered_gp_registers() {
3749 RegSet regs;
3750 regs += RegSet::of(rax, rcx, rdx);
3751 #ifndef _WINDOWS
3752 regs += RegSet::of(rsi, rdi);
3753 #endif
3754 regs += RegSet::range(r8, r11);
3755 if (UseAPX) {
3756 regs += RegSet::range(r16, as_Register(Register::number_of_registers - 1));
3920 xorptr(temp, temp); // use _zero reg to clear memory (shorter code)
3921 if (UseIncDec) {
3922 shrptr(index, 3); // divide by 8/16 and set carry flag if bit 2 was set
3923 } else {
3924 shrptr(index, 2); // use 2 instructions to avoid partial flag stall
3925 shrptr(index, 1);
3926 }
3927
3928 // initialize remaining object fields: index is a multiple of 2 now
3929 {
3930 Label loop;
3931 bind(loop);
3932 movptr(Address(address, index, Address::times_8, offset_in_bytes - 1*BytesPerWord), temp);
3933 decrement(index);
3934 jcc(Assembler::notZero, loop);
3935 }
3936
3937 bind(done);
3938 }
3939
3940 void MacroAssembler::inline_layout_info(Register holder_klass, Register index, Register layout_info) {
3941 movptr(layout_info, Address(holder_klass, InstanceKlass::inline_layout_info_array_offset()));
3942 #ifdef ASSERT
3943 {
3944 Label done;
3945 cmpptr(layout_info, 0);
3946 jcc(Assembler::notEqual, done);
3947 stop("inline_layout_info_array is null");
3948 bind(done);
3949 }
3950 #endif
3951
3952 InlineLayoutInfo array[2];
3953 int size = (char*)&array[1] - (char*)&array[0]; // computing size of array elements
3954 if (is_power_of_2(size)) {
3955 shll(index, log2i_exact(size)); // Scale index by power of 2
3956 } else {
3957 imull(index, index, size); // Scale the index to be the entry index * array_element_size
3958 }
3959 lea(layout_info, Address(layout_info, index, Address::times_1, Array<InlineLayoutInfo>::base_offset_in_bytes()));
3960 }
3961
3962 // Look up the method for a megamorphic invokeinterface call.
3963 // The target method is determined by <intf_klass, itable_index>.
3964 // The receiver klass is in recv_klass.
3965 // On success, the result will be in method_result, and execution falls through.
3966 // On failure, execution transfers to the given label.
3967 void MacroAssembler::lookup_interface_method(Register recv_klass,
3968 Register intf_klass,
3969 RegisterOrConstant itable_index,
3970 Register method_result,
3971 Register scan_temp,
3972 Label& L_no_such_interface,
3973 bool return_method) {
3974 assert_different_registers(recv_klass, intf_klass, scan_temp);
3975 assert_different_registers(method_result, intf_klass, scan_temp);
3976 assert(recv_klass != method_result || !return_method,
3977 "recv_klass can be destroyed when method isn't needed");
3978
3979 assert(itable_index.is_constant() || itable_index.as_register() == method_result,
3980 "caller must use same register for non-constant itable index as for method");
3981
4992 } else {
4993 Label L;
4994 jccb(negate_condition(cc), L);
4995 movl(dst, src);
4996 bind(L);
4997 }
4998 }
4999
5000 void MacroAssembler::cmov32(Condition cc, Register dst, Register src) {
5001 if (VM_Version::supports_cmov()) {
5002 cmovl(cc, dst, src);
5003 } else {
5004 Label L;
5005 jccb(negate_condition(cc), L);
5006 movl(dst, src);
5007 bind(L);
5008 }
5009 }
5010
5011 void MacroAssembler::_verify_oop(Register reg, const char* s, const char* file, int line) {
5012 if (!VerifyOops || VerifyAdapterSharing) {
5013 // Below address of the code string confuses VerifyAdapterSharing
5014 // because it may differ between otherwise equivalent adapters.
5015 return;
5016 }
5017
5018 BLOCK_COMMENT("verify_oop {");
5019 push(rscratch1);
5020 push(rax); // save rax
5021 push(reg); // pass register argument
5022
5023 // Pass register number to verify_oop_subroutine
5024 const char* b = nullptr;
5025 {
5026 ResourceMark rm;
5027 stringStream ss;
5028 ss.print("verify_oop: %s: %s (%s:%d)", reg->name(), s, file, line);
5029 b = code_string(ss.as_string());
5030 }
5031 AddressLiteral buffer((address) b, external_word_Relocation::spec_for_immediate());
5032 pushptr(buffer.addr(), rscratch1);
5033
5034 // call indirectly to solve generation ordering problem
5035 movptr(rax, ExternalAddress(StubRoutines::verify_oop_subroutine_entry_address()));
5036 call(rax);
5252 // or something else. Since this is a slow path, we can optimize for code density,
5253 // and just restart the search from the beginning.
5254 jmpb(L_restart);
5255
5256 // Counter updates:
5257
5258 // Increment polymorphic counter instead of receiver slot.
5259 bind(L_polymorphic);
5260 movptr(offset, poly_count_offset);
5261 jmpb(L_count_update);
5262
5263 // Found a receiver, convert its slot offset to corresponding count offset.
5264 bind(L_found_recv);
5265 addptr(offset, receiver_to_count_step);
5266
5267 bind(L_count_update);
5268 addptr(Address(mdp, offset, Address::times_ptr), DataLayout::counter_increment);
5269 }
5270
5271 void MacroAssembler::_verify_oop_addr(Address addr, const char* s, const char* file, int line) {
5272 if (!VerifyOops || VerifyAdapterSharing) {
5273 // Below address of the code string confuses VerifyAdapterSharing
5274 // because it may differ between otherwise equivalent adapters.
5275 return;
5276 }
5277
5278 push(rscratch1);
5279 push(rax); // save rax,
5280 // addr may contain rsp so we will have to adjust it based on the push
5281 // we just did (and on 64 bit we do two pushes)
5282 // NOTE: 64bit seemed to have had a bug in that it did movq(addr, rax); which
5283 // stores rax into addr which is backwards of what was intended.
5284 if (addr.uses(rsp)) {
5285 lea(rax, addr);
5286 pushptr(Address(rax, 2 * BytesPerWord));
5287 } else {
5288 pushptr(addr);
5289 }
5290
5291 // Pass register number to verify_oop_subroutine
5292 const char* b = nullptr;
5293 {
5294 ResourceMark rm;
5295 stringStream ss;
5296 ss.print("verify_oop_addr: %s (%s:%d)", s, file, line);
5650
5651 void MacroAssembler::load_mirror(Register mirror, Register method, Register tmp) {
5652 // get mirror
5653 const int mirror_offset = in_bytes(Klass::java_mirror_offset());
5654 load_method_holder(mirror, method);
5655 movptr(mirror, Address(mirror, mirror_offset));
5656 resolve_oop_handle(mirror, tmp);
5657 }
5658
5659 void MacroAssembler::load_method_holder_cld(Register rresult, Register rmethod) {
5660 load_method_holder(rresult, rmethod);
5661 movptr(rresult, Address(rresult, InstanceKlass::class_loader_data_offset()));
5662 }
5663
5664 void MacroAssembler::load_method_holder(Register holder, Register method) {
5665 movptr(holder, Address(method, Method::const_offset())); // ConstMethod*
5666 movptr(holder, Address(holder, ConstMethod::constants_offset())); // ConstantPool*
5667 movptr(holder, Address(holder, ConstantPool::pool_holder_offset())); // InstanceKlass*
5668 }
5669
5670 void MacroAssembler::load_metadata(Register dst, Register src) {
5671 if (UseCompactObjectHeaders) {
5672 load_narrow_klass_compact(dst, src);
5673 } else {
5674 movl(dst, Address(src, oopDesc::klass_offset_in_bytes()));
5675 }
5676 }
5677
5678 void MacroAssembler::load_narrow_klass_compact(Register dst, Register src) {
5679 assert(UseCompactObjectHeaders, "expect compact object headers");
5680 movq(dst, Address(src, oopDesc::mark_offset_in_bytes()));
5681 shrq(dst, markWord::klass_shift);
5682 }
5683
5684 void MacroAssembler::load_klass(Register dst, Register src, Register tmp) {
5685 assert_different_registers(src, tmp);
5686 assert_different_registers(dst, tmp);
5687
5688 if (UseCompactObjectHeaders) {
5689 load_narrow_klass_compact(dst, src);
5690 decode_klass_not_null(dst, tmp);
5691 } else {
5692 movl(dst, Address(src, oopDesc::klass_offset_in_bytes()));
5693 decode_klass_not_null(dst, tmp);
5694 }
5695 }
5696
5697 void MacroAssembler::load_prototype_header(Register dst, Register src, Register tmp) {
5698 load_klass(dst, src, tmp);
5699 movptr(dst, Address(dst, Klass::prototype_header_offset()));
5700 }
5701
5702 void MacroAssembler::store_klass(Register dst, Register src, Register tmp) {
5703 assert(!UseCompactObjectHeaders, "not with compact headers");
5704 assert_different_registers(src, tmp);
5705 assert_different_registers(dst, tmp);
5706 encode_klass_not_null(src, tmp);
5707 movl(Address(dst, oopDesc::klass_offset_in_bytes()), src);
5708 }
5709
5710 void MacroAssembler::cmp_klass(Register klass, Register obj, Register tmp) {
5711 if (UseCompactObjectHeaders) {
5712 assert(tmp != noreg, "need tmp");
5713 assert_different_registers(klass, obj, tmp);
5714 load_narrow_klass_compact(tmp, obj);
5715 cmpl(klass, tmp);
5716 } else {
5717 cmpl(klass, Address(obj, oopDesc::klass_offset_in_bytes()));
5718 }
5719 }
5720
5721 void MacroAssembler::cmp_klasses_from_objects(Register obj1, Register obj2, Register tmp1, Register tmp2) {
5738 bool as_raw = (decorators & AS_RAW) != 0;
5739 if (as_raw) {
5740 bs->BarrierSetAssembler::load_at(this, decorators, type, dst, src, tmp1);
5741 } else {
5742 bs->load_at(this, decorators, type, dst, src, tmp1);
5743 }
5744 }
5745
5746 void MacroAssembler::access_store_at(BasicType type, DecoratorSet decorators, Address dst, Register val,
5747 Register tmp1, Register tmp2, Register tmp3) {
5748 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
5749 decorators = AccessInternal::decorator_fixup(decorators, type);
5750 bool as_raw = (decorators & AS_RAW) != 0;
5751 if (as_raw) {
5752 bs->BarrierSetAssembler::store_at(this, decorators, type, dst, val, tmp1, tmp2, tmp3);
5753 } else {
5754 bs->store_at(this, decorators, type, dst, val, tmp1, tmp2, tmp3);
5755 }
5756 }
5757
5758 void MacroAssembler::flat_field_copy(DecoratorSet decorators, Register src, Register dst,
5759 Register inline_layout_info) {
5760 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
5761 bs->flat_field_copy(this, decorators, src, dst, inline_layout_info);
5762 }
5763
5764 void MacroAssembler::payload_offset(Register inline_klass, Register offset) {
5765 movptr(offset, Address(inline_klass, InlineKlass::adr_members_offset()));
5766 movl(offset, Address(offset, InlineKlass::payload_offset_offset()));
5767 }
5768
5769 void MacroAssembler::payload_addr(Register oop, Register data, Register inline_klass) {
5770 // ((address) (void*) o) + vk->payload_offset();
5771 Register offset = (data == oop) ? rscratch1 : data;
5772 payload_offset(inline_klass, offset);
5773 if (data == oop) {
5774 addptr(data, offset);
5775 } else {
5776 lea(data, Address(oop, offset));
5777 }
5778 }
5779
5780 void MacroAssembler::data_for_value_array_index(Register array, Register array_klass,
5781 Register index, Register data) {
5782 assert(index != rcx, "index needs to shift by rcx");
5783 assert_different_registers(array, array_klass, index);
5784 assert_different_registers(rcx, array, index);
5785
5786 // array->base() + (index << Klass::layout_helper_log2_element_size(lh));
5787 movl(rcx, Address(array_klass, Klass::layout_helper_offset()));
5788
5789 // Klass::layout_helper_log2_element_size(lh)
5790 // (lh >> _lh_log2_element_size_shift) & _lh_log2_element_size_mask;
5791 shrl(rcx, Klass::_lh_log2_element_size_shift);
5792 andl(rcx, Klass::_lh_log2_element_size_mask);
5793 shlptr(index); // index << rcx
5794
5795 lea(data, Address(array, index, Address::times_1, arrayOopDesc::base_offset_in_bytes(T_FLAT_ELEMENT)));
5796 }
5797
5798 void MacroAssembler::load_heap_oop(Register dst, Address src, Register tmp1, DecoratorSet decorators) {
5799 access_load_at(T_OBJECT, IN_HEAP | decorators, dst, src, tmp1);
5800 }
5801
5802 // Doesn't do verification, generates fixed size code
5803 void MacroAssembler::load_heap_oop_not_null(Register dst, Address src, Register tmp1, DecoratorSet decorators) {
5804 access_load_at(T_OBJECT, IN_HEAP | IS_NOT_NULL | decorators, dst, src, tmp1);
5805 }
5806
5807 void MacroAssembler::store_heap_oop(Address dst, Register val, Register tmp1,
5808 Register tmp2, Register tmp3, DecoratorSet decorators) {
5809 access_store_at(T_OBJECT, IN_HEAP | decorators, dst, val, tmp1, tmp2, tmp3);
5810 }
5811
5812 // Used for storing nulls.
5813 void MacroAssembler::store_heap_oop_null(Address dst) {
5814 access_store_at(T_OBJECT, IN_HEAP, dst, noreg, noreg, noreg, noreg);
5815 }
5816
5817 void MacroAssembler::store_klass_gap(Register dst, Register src) {
6126 assert (oop_recorder() != nullptr, "this assembler needs an OopRecorder");
6127 int klass_index = oop_recorder()->find_index(k);
6128 RelocationHolder rspec = metadata_Relocation::spec(klass_index);
6129 Assembler::cmp_narrow_oop(dst, CompressedKlassPointers::encode(k), rspec);
6130 }
6131
6132 void MacroAssembler::reinit_heapbase() {
6133 if (UseCompressedOops) {
6134 if (Universe::heap() != nullptr) {
6135 if (CompressedOops::base() == nullptr) {
6136 MacroAssembler::xorptr(r12_heapbase, r12_heapbase);
6137 } else {
6138 mov64(r12_heapbase, (int64_t)CompressedOops::base());
6139 }
6140 } else {
6141 movptr(r12_heapbase, ExternalAddress(CompressedOops::base_addr()));
6142 }
6143 }
6144 }
6145
6146 int MacroAssembler::store_inline_type_fields_to_buf(ciInlineKlass* vk, bool from_interpreter) {
6147 assert(InlineTypeReturnedAsFields, "Inline types should never be returned as fields");
6148 // An inline type might be returned. If fields are in registers we
6149 // need to allocate an inline type instance and initialize it with
6150 // the value of the fields.
6151 Label skip;
6152 // We only need a new buffered inline type if a new one is not returned
6153 testptr(rax, 1);
6154 jcc(Assembler::zero, skip);
6155 int call_offset = -1;
6156
6157 #ifdef _LP64
6158 // The following code is similar to allocate_instance but has some slight differences,
6159 // e.g. object size is always not zero, sometimes it's constant; storing klass ptr after
6160 // allocating is not necessary if vk != nullptr, etc. allocate_instance is not aware of these.
6161 Label slow_case;
6162 // 1. Try to allocate a new buffered inline instance either from TLAB or eden space
6163 mov(rscratch1, rax); // save rax for slow_case since *_allocate may corrupt it when allocation failed
6164 if (vk != nullptr) {
6165 // Called from C1, where the return type is statically known.
6166 movptr(rbx, (intptr_t)vk->get_InlineKlass());
6167 jint lh = vk->layout_helper();
6168 assert(lh != Klass::_lh_neutral_value, "inline class in return type must have been resolved");
6169 if (UseTLAB && !Klass::layout_helper_needs_slow_path(lh)) {
6170 tlab_allocate(rax, noreg, lh, r13, r14, slow_case);
6171 } else {
6172 jmp(slow_case);
6173 }
6174 } else {
6175 // Call from interpreter. RAX contains ((the InlineKlass* of the return type) | 0x01)
6176 mov(rbx, rax);
6177 andptr(rbx, -2);
6178 if (UseTLAB) {
6179 movl(r14, Address(rbx, Klass::layout_helper_offset()));
6180 testl(r14, Klass::_lh_instance_slow_path_bit);
6181 jcc(Assembler::notZero, slow_case);
6182 tlab_allocate(rax, r14, 0, r13, r14, slow_case);
6183 } else {
6184 jmp(slow_case);
6185 }
6186 }
6187 if (UseTLAB) {
6188 // 2. Initialize buffered inline instance header
6189 Register buffer_obj = rax;
6190 Register klass = rbx;
6191 if (UseCompactObjectHeaders) {
6192 Register mark_word = r13;
6193 movptr(mark_word, Address(klass, Klass::prototype_header_offset()));
6194 movptr(Address(buffer_obj, oopDesc::mark_offset_in_bytes()), mark_word);
6195 } else {
6196 movptr(Address(buffer_obj, oopDesc::mark_offset_in_bytes()), (intptr_t)markWord::inline_type_prototype().value());
6197 xorl(r13, r13);
6198 store_klass_gap(buffer_obj, r13);
6199 if (vk == nullptr) {
6200 // store_klass corrupts rbx(klass), so save it in r13 for later use (interpreter case only).
6201 mov(r13, klass);
6202 }
6203 store_klass(buffer_obj, klass, rscratch1);
6204 klass = r13;
6205 }
6206 // 3. Initialize its fields with an inline class specific handler
6207 if (vk != nullptr) {
6208 call(RuntimeAddress(vk->pack_handler())); // no need for call info as this will not safepoint.
6209 } else {
6210 movptr(rbx, Address(klass, InlineKlass::adr_members_offset()));
6211 movptr(rbx, Address(rbx, InlineKlass::pack_handler_offset()));
6212 call(rbx);
6213 }
6214 jmp(skip);
6215 }
6216 bind(slow_case);
6217 // We failed to allocate a new inline type, fall back to a runtime
6218 // call. Some oop field may be live in some registers but we can't
6219 // tell. That runtime call will take care of preserving them
6220 // across a GC if there's one.
6221 mov(rax, rscratch1);
6222 #endif
6223
6224 if (from_interpreter) {
6225 super_call_VM_leaf(StubRoutines::store_inline_type_fields_to_buf());
6226 } else {
6227 call(RuntimeAddress(StubRoutines::store_inline_type_fields_to_buf()));
6228 call_offset = offset();
6229 }
6230
6231 bind(skip);
6232 return call_offset;
6233 }
6234
6235 // Move a value between registers/stack slots and update the reg_state
6236 bool MacroAssembler::move_helper(VMReg from, VMReg to, BasicType bt, RegState reg_state[]) {
6237 assert(from->is_valid() && to->is_valid(), "source and destination must be valid");
6238 if (reg_state[to->value()] == reg_written) {
6239 return true; // Already written
6240 }
6241 if (from != to && bt != T_VOID) {
6242 if (reg_state[to->value()] == reg_readonly) {
6243 return false; // Not yet writable
6244 }
6245 if (from->is_reg()) {
6246 if (to->is_reg()) {
6247 if (from->is_XMMRegister()) {
6248 if (bt == T_DOUBLE) {
6249 movdbl(to->as_XMMRegister(), from->as_XMMRegister());
6250 } else {
6251 assert(bt == T_FLOAT, "must be float");
6252 movflt(to->as_XMMRegister(), from->as_XMMRegister());
6253 }
6254 } else {
6255 movq(to->as_Register(), from->as_Register());
6256 }
6257 } else {
6258 int st_off = to->reg2stack() * VMRegImpl::stack_slot_size + wordSize;
6259 Address to_addr = Address(rsp, st_off);
6260 if (from->is_XMMRegister()) {
6261 if (bt == T_DOUBLE) {
6262 movdbl(to_addr, from->as_XMMRegister());
6263 } else {
6264 assert(bt == T_FLOAT, "must be float");
6265 movflt(to_addr, from->as_XMMRegister());
6266 }
6267 } else {
6268 movq(to_addr, from->as_Register());
6269 }
6270 }
6271 } else {
6272 Address from_addr = Address(rsp, from->reg2stack() * VMRegImpl::stack_slot_size + wordSize);
6273 if (to->is_reg()) {
6274 if (to->is_XMMRegister()) {
6275 if (bt == T_DOUBLE) {
6276 movdbl(to->as_XMMRegister(), from_addr);
6277 } else {
6278 assert(bt == T_FLOAT, "must be float");
6279 movflt(to->as_XMMRegister(), from_addr);
6280 }
6281 } else {
6282 movq(to->as_Register(), from_addr);
6283 }
6284 } else {
6285 int st_off = to->reg2stack() * VMRegImpl::stack_slot_size + wordSize;
6286 movq(r13, from_addr);
6287 movq(Address(rsp, st_off), r13);
6288 }
6289 }
6290 }
6291 // Update register states
6292 reg_state[from->value()] = reg_writable;
6293 reg_state[to->value()] = reg_written;
6294 return true;
6295 }
6296
6297 // Calculate the extra stack space required for packing or unpacking inline
6298 // args and adjust the stack pointer (see MacroAssembler::remove_frame).
6299 int MacroAssembler::extend_stack_for_inline_args(int args_on_stack) {
6300 int sp_inc = args_on_stack * VMRegImpl::stack_slot_size;
6301 sp_inc = align_up(sp_inc, StackAlignmentInBytes);
6302 assert(sp_inc > 0, "sanity");
6303 // Two additional slots to account for return address
6304 sp_inc += 2 * VMRegImpl::stack_slot_size;
6305
6306 push(rbp);
6307 subptr(rsp, sp_inc);
6308 #ifdef ASSERT
6309 movl(Address(rsp, 0), badRegWordVal);
6310 movl(Address(rsp, VMRegImpl::stack_slot_size), badRegWordVal);
6311 #endif
6312 return sp_inc + wordSize; // account for rbp space
6313 }
6314
6315 // Read all fields from an inline type buffer and store the field values in registers/stack slots.
6316 bool MacroAssembler::unpack_inline_helper(const GrowableArray<SigEntry>* sig, int& sig_index,
6317 VMReg from, int& from_index, VMRegPair* to, int to_count, int& to_index,
6318 RegState reg_state[]) {
6319 assert(sig->at(sig_index)._bt == T_VOID, "should be at end delimiter");
6320 assert(from->is_valid(), "source must be valid");
6321 bool progress = false;
6322 #ifdef ASSERT
6323 const int start_offset = offset();
6324 #endif
6325
6326 Label L_null, L_notNull;
6327 // Don't use r14 as tmp because it's used for spilling (see MacroAssembler::spill_reg_for)
6328 Register tmp1 = r10;
6329 Register tmp2 = r13;
6330 Register fromReg = noreg;
6331 ScalarizedInlineArgsStream stream(sig, sig_index, to, to_count, to_index, true);
6332 bool done = true;
6333 bool mark_done = true;
6334 VMReg toReg;
6335 BasicType bt;
6336 // Check if argument requires a null check
6337 bool null_check = false;
6338 VMReg nullCheckReg;
6339 while (stream.next(nullCheckReg, bt)) {
6340 if (sig->at(stream.sig_index())._offset == -1) {
6341 null_check = true;
6342 break;
6343 }
6344 }
6345 stream.reset(sig_index, to_index);
6346 while (stream.next(toReg, bt)) {
6347 assert(toReg->is_valid(), "destination must be valid");
6348 int idx = (int)toReg->value();
6349 if (reg_state[idx] == reg_readonly) {
6350 if (idx != from->value()) {
6351 mark_done = false;
6352 }
6353 done = false;
6354 continue;
6355 } else if (reg_state[idx] == reg_written) {
6356 continue;
6357 }
6358 assert(reg_state[idx] == reg_writable, "must be writable");
6359 reg_state[idx] = reg_written;
6360 progress = true;
6361
6362 if (fromReg == noreg) {
6363 if (from->is_reg()) {
6364 fromReg = from->as_Register();
6365 } else {
6366 int st_off = from->reg2stack() * VMRegImpl::stack_slot_size + wordSize;
6367 movq(tmp1, Address(rsp, st_off));
6368 fromReg = tmp1;
6369 }
6370 if (null_check) {
6371 // Nullable inline type argument, emit null check
6372 testptr(fromReg, fromReg);
6373 jcc(Assembler::zero, L_null);
6374 }
6375 }
6376 int off = sig->at(stream.sig_index())._offset;
6377 if (off == -1) {
6378 assert(null_check, "Missing null check at");
6379 if (toReg->is_stack()) {
6380 int st_off = toReg->reg2stack() * VMRegImpl::stack_slot_size + wordSize;
6381 movq(Address(rsp, st_off), 1);
6382 } else {
6383 movq(toReg->as_Register(), 1);
6384 }
6385 continue;
6386 }
6387 if (sig->at(stream.sig_index())._vt_oop) {
6388 if (toReg->is_stack()) {
6389 int st_off = toReg->reg2stack() * VMRegImpl::stack_slot_size + wordSize;
6390 movq(Address(rsp, st_off), fromReg);
6391 } else {
6392 movq(toReg->as_Register(), fromReg);
6393 }
6394 continue;
6395 }
6396 assert(off > 0, "offset in object should be positive");
6397 Address fromAddr = Address(fromReg, off);
6398 if (!toReg->is_XMMRegister()) {
6399 Register dst = toReg->is_stack() ? tmp2 : toReg->as_Register();
6400 if (is_reference_type(bt)) {
6401 load_heap_oop(dst, fromAddr);
6402 } else {
6403 bool is_signed = (bt != T_CHAR) && (bt != T_BOOLEAN);
6404 load_sized_value(dst, fromAddr, type2aelembytes(bt), is_signed);
6405 }
6406 if (toReg->is_stack()) {
6407 int st_off = toReg->reg2stack() * VMRegImpl::stack_slot_size + wordSize;
6408 movq(Address(rsp, st_off), dst);
6409 }
6410 } else if (bt == T_DOUBLE) {
6411 movdbl(toReg->as_XMMRegister(), fromAddr);
6412 } else {
6413 assert(bt == T_FLOAT, "must be float");
6414 movflt(toReg->as_XMMRegister(), fromAddr);
6415 }
6416 }
6417 if (progress && null_check) {
6418 if (done) {
6419 jmp(L_notNull);
6420 bind(L_null);
6421 // Set null marker to zero to signal that the argument is null.
6422 // Also set all fields to zero since the runtime requires a canonical
6423 // representation of a flat null.
6424 stream.reset(sig_index, to_index);
6425 while (stream.next(toReg, bt)) {
6426 if (toReg->is_stack()) {
6427 int st_off = toReg->reg2stack() * VMRegImpl::stack_slot_size + wordSize;
6428 movq(Address(rsp, st_off), 0);
6429 } else if (toReg->is_XMMRegister()) {
6430 xorps(toReg->as_XMMRegister(), toReg->as_XMMRegister());
6431 } else {
6432 xorl(toReg->as_Register(), toReg->as_Register());
6433 }
6434 }
6435 bind(L_notNull);
6436 } else {
6437 bind(L_null);
6438 }
6439 }
6440
6441 sig_index = stream.sig_index();
6442 to_index = stream.regs_index();
6443
6444 if (mark_done && reg_state[from->value()] != reg_written) {
6445 // This is okay because no one else will write to that slot
6446 reg_state[from->value()] = reg_writable;
6447 }
6448 from_index--;
6449 assert(progress || (start_offset == offset()), "should not emit code");
6450 return done;
6451 }
6452
6453 bool MacroAssembler::pack_inline_helper(const GrowableArray<SigEntry>* sig, int& sig_index, int vtarg_index,
6454 VMRegPair* from, int from_count, int& from_index, VMReg to,
6455 RegState reg_state[], Register val_array) {
6456 assert(sig->at(sig_index)._bt == T_METADATA, "should be at delimiter");
6457 assert(to->is_valid(), "destination must be valid");
6458
6459 if (reg_state[to->value()] == reg_written) {
6460 skip_unpacked_fields(sig, sig_index, from, from_count, from_index);
6461 return true; // Already written
6462 }
6463
6464 // TODO 8284443 Isn't it an issue if below code uses r14 as tmp when it contains a spilled value?
6465 // Be careful with r14 because it's used for spilling (see MacroAssembler::spill_reg_for).
6466 Register val_obj_tmp = r11;
6467 Register from_reg_tmp = r14;
6468 Register tmp1 = r10;
6469 Register tmp2 = r13;
6470 Register tmp3 = rbx;
6471 Register val_obj = to->is_stack() ? val_obj_tmp : to->as_Register();
6472
6473 assert_different_registers(val_obj_tmp, from_reg_tmp, tmp1, tmp2, tmp3, val_array);
6474
6475 if (reg_state[to->value()] == reg_readonly) {
6476 if (!is_reg_in_unpacked_fields(sig, sig_index, to, from, from_count, from_index)) {
6477 skip_unpacked_fields(sig, sig_index, from, from_count, from_index);
6478 return false; // Not yet writable
6479 }
6480 val_obj = val_obj_tmp;
6481 }
6482
6483 ScalarizedInlineArgsStream stream(sig, sig_index, from, from_count, from_index);
6484 VMReg fromReg;
6485 BasicType bt;
6486 Label L_null;
6487 while (stream.next(fromReg, bt)) {
6488 assert(fromReg->is_valid(), "source must be valid");
6489 reg_state[fromReg->value()] = reg_writable;
6490
6491 int off = sig->at(stream.sig_index())._offset;
6492 if (off == -1) {
6493 // Nullable inline type argument, emit null check
6494 Label L_notNull;
6495 if (fromReg->is_stack()) {
6496 int ld_off = fromReg->reg2stack() * VMRegImpl::stack_slot_size + wordSize;
6497 testb(Address(rsp, ld_off), 1);
6498 } else {
6499 testb(fromReg->as_Register(), 1);
6500 }
6501 jcc(Assembler::notZero, L_notNull);
6502 movptr(val_obj, 0);
6503 jmp(L_null);
6504 bind(L_notNull);
6505 continue;
6506 }
6507 if (sig->at(stream.sig_index())._vt_oop) {
6508 // buffer argument: use if non null
6509 if (fromReg->is_stack()) {
6510 int ld_off = fromReg->reg2stack() * VMRegImpl::stack_slot_size + wordSize;
6511 movptr(val_obj, Address(rsp, ld_off));
6512 } else {
6513 movptr(val_obj, fromReg->as_Register());
6514 }
6515 testptr(val_obj, val_obj);
6516 jcc(Assembler::notEqual, L_null);
6517 // otherwise get the buffer from the just allocated pool of buffers
6518 int index = arrayOopDesc::base_offset_in_bytes(T_OBJECT) + vtarg_index * type2aelembytes(T_OBJECT);
6519 load_heap_oop(val_obj, Address(val_array, index));
6520 continue;
6521 }
6522
6523 assert(off > 0, "offset in object should be positive");
6524 size_t size_in_bytes = is_java_primitive(bt) ? type2aelembytes(bt) : wordSize;
6525
6526 // Pack the scalarized field into the value object.
6527 Address dst(val_obj, off);
6528 if (!fromReg->is_XMMRegister()) {
6529 Register src;
6530 if (fromReg->is_stack()) {
6531 src = from_reg_tmp;
6532 int ld_off = fromReg->reg2stack() * VMRegImpl::stack_slot_size + wordSize;
6533 load_sized_value(src, Address(rsp, ld_off), size_in_bytes, /* is_signed */ false);
6534 } else {
6535 src = fromReg->as_Register();
6536 }
6537 assert_different_registers(dst.base(), src, tmp1, tmp2, tmp3, val_array);
6538 if (is_reference_type(bt)) {
6539 // store_heap_oop transitively calls oop_store_at which corrupts to.base(). We need to keep val_obj valid.
6540 mov(tmp3, val_obj);
6541 Address dst_with_tmp3(tmp3, off);
6542 store_heap_oop(dst_with_tmp3, src, tmp1, tmp2, tmp3, IN_HEAP | ACCESS_WRITE | IS_DEST_UNINITIALIZED);
6543 } else {
6544 store_sized_value(dst, src, size_in_bytes);
6545 }
6546 } else if (bt == T_DOUBLE) {
6547 movdbl(dst, fromReg->as_XMMRegister());
6548 } else {
6549 assert(bt == T_FLOAT, "must be float");
6550 movflt(dst, fromReg->as_XMMRegister());
6551 }
6552 }
6553 bind(L_null);
6554 sig_index = stream.sig_index();
6555 from_index = stream.regs_index();
6556
6557 assert(reg_state[to->value()] == reg_writable, "must have already been read");
6558 bool success = move_helper(val_obj->as_VMReg(), to, T_OBJECT, reg_state);
6559 assert(success, "to register must be writeable");
6560 return true;
6561 }
6562
6563 VMReg MacroAssembler::spill_reg_for(VMReg reg) {
6564 return reg->is_XMMRegister() ? xmm8->as_VMReg() : r14->as_VMReg();
6565 }
6566
6567 void MacroAssembler::remove_frame(int initial_framesize, bool needs_stack_repair) {
6568 assert((initial_framesize & (StackAlignmentInBytes-1)) == 0, "frame size not aligned");
6569 if (needs_stack_repair) {
6570 // The method has a scalarized entry point (where fields of value object arguments
6571 // are passed through registers and stack), and a non-scalarized entry point (where
6572 // value object arguments are given as oops). The non-scalarized entry point will
6573 // first load each field of value object arguments and store them in registers and on
6574 // the stack in a way compatible with the scalarized entry point. To do so, some extra
6575 // stack space might be reserved (if argument registers are not enough). On leaving the
6576 // method, this space must be freed.
6577 //
6578 // In case we used the non-scalarized entry point the stack looks like this:
6579 //
6580 // | Arguments from caller |
6581 // |---------------------------| <-- caller's SP
6582 // | Return address #1 |
6583 // | Saved RBP #1 |
6584 // |---------------------------|
6585 // | Extension space for |
6586 // | inline arg (un)packing |
6587 // |---------------------------| <-- start of this method's frame
6588 // | Return address #2 |
6589 // | Saved RBP #2 |
6590 // |---------------------------| <-- RBP (with -XX:+PreserveFramePointer)
6591 // | sp_inc |
6592 // | method locals |
6593 // |---------------------------| <-- SP
6594 //
6595 // Space for the return pc and saved rbp is reserved twice. But only the #1 copies
6596 // contain the real values of return pc and saved rbp. The #2 copies are not reliable
6597 // and should not be used. They are mostly needed to add space between the extension
6598 // space and the locals, as there would be between the real arguments and the locals
6599 // if we don't need to do unpacking (from the scalarized entry point).
6600 //
6601 // When leaving, one must load RBP #1 into RBP, and use the copy #1 of the return address,
6602 // while keeping in mind that from the scalarized entry point, there will be only one
6603 // copy. Indeed, in the case we used the scalarized calling convention, the stack looks like this:
6604 //
6605 // | Arguments from caller |
6606 // |---------------------------| <-- caller's SP
6607 // | Return address |
6608 // | Saved RBP |
6609 // |---------------------------| <-- FP (with -XX:+PreserveFramePointer)
6610 // | sp_inc |
6611 // | method locals |
6612 // |---------------------------| <-- SP
6613 //
6614 // The sp_inc stack slot holds the total size of the frame, including the extension
6615 // space and copies #2 of the return address and the saved RBP (but never the copies
6616 // #1 of the return address and saved RBP). That is how to find the copies #1 of the
6617 // return address and saved rbp. This size is expressed in bytes. Be careful when using
6618 // it from C++ in pointer arithmetic you might need to divide it by wordSize.
6619
6620 // The stack increment resides just below the saved rbp
6621 addq(rsp, Address(rsp, initial_framesize - wordSize));
6622 pop(rbp);
6623 } else {
6624 if (initial_framesize > 0) {
6625 addq(rsp, initial_framesize);
6626 }
6627 pop(rbp);
6628 }
6629 }
6630
6631 #if COMPILER2_OR_JVMCI
6632
6633 // clear memory of size 'cnt' qwords, starting at 'base' using XMM/YMM/ZMM registers
6634 void MacroAssembler::xmm_clear_mem(Register base, Register cnt, Register val, XMMRegister xtmp, KRegister mask) {
6635 // cnt - number of qwords (8-byte words).
6636 // base - start address, qword aligned.
6637 Label L_zero_64_bytes, L_loop, L_sloop, L_tail, L_end;
6638 bool use64byteVector = (MaxVectorSize == 64) && (CopyAVX3Threshold == 0);
6639 if (use64byteVector) {
6640 evpbroadcastq(xtmp, val, AVX_512bit);
6641 } else if (MaxVectorSize >= 32) {
6642 movdq(xtmp, val);
6643 punpcklqdq(xtmp, xtmp);
6644 vinserti128_high(xtmp, xtmp);
6645 } else {
6646 movdq(xtmp, val);
6647 punpcklqdq(xtmp, xtmp);
6648 }
6649 jmp(L_zero_64_bytes);
6650
6651 BIND(L_loop);
6652 if (MaxVectorSize >= 32) {
6653 fill64(base, 0, xtmp, use64byteVector);
6654 } else {
6655 movdqu(Address(base, 0), xtmp);
6656 movdqu(Address(base, 16), xtmp);
6657 movdqu(Address(base, 32), xtmp);
6658 movdqu(Address(base, 48), xtmp);
6659 }
6660 addptr(base, 64);
6661
6662 BIND(L_zero_64_bytes);
6663 subptr(cnt, 8);
6664 jccb(Assembler::greaterEqual, L_loop);
6665
6666 // Copy trailing 64 bytes
6667 if (use64byteVector) {
6668 addptr(cnt, 8);
6669 jccb(Assembler::equal, L_end);
6670 fill64_masked(3, base, 0, xtmp, mask, cnt, val, true);
6671 jmp(L_end);
6672 } else {
6673 addptr(cnt, 4);
6674 jccb(Assembler::less, L_tail);
6675 if (MaxVectorSize >= 32) {
6676 vmovdqu(Address(base, 0), xtmp);
6677 } else {
6678 movdqu(Address(base, 0), xtmp);
6679 movdqu(Address(base, 16), xtmp);
6680 }
6681 }
6682 addptr(base, 32);
6683 subptr(cnt, 4);
6684
6685 BIND(L_tail);
6686 addptr(cnt, 4);
6687 jccb(Assembler::lessEqual, L_end);
6688 if (UseAVX > 2 && MaxVectorSize >= 32 && VM_Version::supports_avx512vl()) {
6689 fill32_masked(3, base, 0, xtmp, mask, cnt, val);
6690 } else {
6691 decrement(cnt);
6692
6693 BIND(L_sloop);
6694 movq(Address(base, 0), xtmp);
6695 addptr(base, 8);
6696 decrement(cnt);
6697 jccb(Assembler::greaterEqual, L_sloop);
6698 }
6699 BIND(L_end);
6700 }
6701
6702 // Clearing constant sized memory using YMM/ZMM registers.
6703 void MacroAssembler::clear_mem(Register base, int cnt, Register rtmp, XMMRegister xtmp, KRegister mask) {
6704 assert(UseAVX > 2 && VM_Version::supports_avx512vl(), "");
6705 bool use64byteVector = (MaxVectorSize > 32) && (CopyAVX3Threshold == 0);
6706
6707 int vector64_count = (cnt & (~0x7)) >> 3;
6708 cnt = cnt & 0x7;
6709 const int fill64_per_loop = 4;
6771 break;
6772 case 7:
6773 if (use64byteVector) {
6774 movl(rtmp, 0x7F);
6775 kmovwl(mask, rtmp);
6776 evmovdqu(T_LONG, mask, Address(base, disp), xtmp, true, Assembler::AVX_512bit);
6777 } else {
6778 evmovdqu(T_LONG, k0, Address(base, disp), xtmp, false, Assembler::AVX_256bit);
6779 movl(rtmp, 0x7);
6780 kmovwl(mask, rtmp);
6781 evmovdqu(T_LONG, mask, Address(base, disp + 32), xtmp, true, Assembler::AVX_256bit);
6782 }
6783 break;
6784 default:
6785 fatal("Unexpected length : %d\n",cnt);
6786 break;
6787 }
6788 }
6789 }
6790
6791 void MacroAssembler::clear_mem(Register base, Register cnt, Register val, XMMRegister xtmp,
6792 bool is_large, bool word_copy_only, KRegister mask) {
6793 // cnt - number of qwords (8-byte words).
6794 // base - start address, qword aligned.
6795 // is_large - if optimizers know cnt is larger than InitArrayShortSize
6796 assert(base==rdi, "base register must be edi for rep stos");
6797 assert(val==rax, "val register must be eax for rep stos");
6798 assert(cnt==rcx, "cnt register must be ecx for rep stos");
6799 assert(InitArrayShortSize % BytesPerLong == 0,
6800 "InitArrayShortSize should be the multiple of BytesPerLong");
6801
6802 Label DONE;
6803
6804 if (!is_large) {
6805 Label LOOP, LONG;
6806 cmpptr(cnt, InitArrayShortSize/BytesPerLong);
6807 jccb(Assembler::greater, LONG);
6808
6809 decrement(cnt);
6810 jccb(Assembler::negative, DONE); // Zero length
6811
6812 // Use individual pointer-sized stores for small counts:
6813 BIND(LOOP);
6814 movptr(Address(base, cnt, Address::times_ptr), val);
6815 decrement(cnt);
6816 jccb(Assembler::greaterEqual, LOOP);
6817 jmpb(DONE);
6818
6819 BIND(LONG);
6820 }
6821
6822 // Use longer rep-prefixed ops for non-small counts:
6823 if (UseFastStosb && !word_copy_only) {
6824 shlptr(cnt, 3); // convert to number of bytes
6825 rep_stosb();
6826 } else if (UseXMMForObjInit) {
6827 xmm_clear_mem(base, cnt, val, xtmp, mask);
6828 } else {
6829 rep_stos();
6830 }
6831
6832 BIND(DONE);
6833 }
6834
6835 #endif //COMPILER2_OR_JVMCI
6836
6837
6838 void MacroAssembler::generate_fill(BasicType t, bool aligned,
6839 Register to, Register value, Register count,
6840 Register rtmp, XMMRegister xtmp) {
6841 ShortBranchVerifier sbv(this);
6842 assert_different_registers(to, value, count, rtmp);
6843 Label L_exit;
6844 Label L_fill_2_bytes, L_fill_4_bytes;
6845
6846 #if defined(COMPILER2)
6847 if(MaxVectorSize >=32 &&
10726
10727 // Load top.
10728 movl(top, Address(thread, JavaThread::lock_stack_top_offset()));
10729
10730 // Check if the lock-stack is full.
10731 cmpl(top, LockStack::end_offset());
10732 jcc(Assembler::greaterEqual, slow);
10733
10734 // Check for recursion.
10735 cmpptr(obj, Address(thread, top, Address::times_1, -oopSize));
10736 jcc(Assembler::equal, push);
10737
10738 // Check header for monitor (0b10).
10739 testptr(reg_rax, markWord::monitor_value);
10740 jcc(Assembler::notZero, slow);
10741
10742 // Try to lock. Transition lock bits 0b01 => 0b00
10743 movptr(tmp, reg_rax);
10744 andptr(tmp, ~(int32_t)markWord::unlocked_value);
10745 orptr(reg_rax, markWord::unlocked_value);
10746 // Mask inline_type bit such that we go to the slow path if object is an inline type
10747 andptr(reg_rax, ~((int) markWord::inline_type_bit_in_place));
10748
10749 lock(); cmpxchgptr(tmp, Address(obj, oopDesc::mark_offset_in_bytes()));
10750 jcc(Assembler::notEqual, slow);
10751
10752 // Restore top, CAS clobbers register.
10753 movl(top, Address(thread, JavaThread::lock_stack_top_offset()));
10754
10755 bind(push);
10756 // After successful lock, push object on lock-stack.
10757 movptr(Address(thread, top), obj);
10758 incrementl(top, oopSize);
10759 movl(Address(thread, JavaThread::lock_stack_top_offset()), top);
10760 }
10761
10762 // Implements fast-unlocking.
10763 //
10764 // obj: the object to be unlocked
10765 // reg_rax: rax
10766 // thread: the thread
10767 // tmp: a temporary register
10768 void MacroAssembler::fast_unlock(Register obj, Register reg_rax, Register tmp, Label& slow) {
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