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src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp

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   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #include "asm/assembler.hpp"
  27 #include "asm/assembler.inline.hpp"
  28 #include "ci/ciEnv.hpp"

  29 #include "code/compiledIC.hpp"
  30 #include "compiler/compileTask.hpp"
  31 #include "compiler/disassembler.hpp"
  32 #include "compiler/oopMap.hpp"
  33 #include "gc/shared/barrierSet.hpp"
  34 #include "gc/shared/barrierSetAssembler.hpp"
  35 #include "gc/shared/cardTableBarrierSet.hpp"
  36 #include "gc/shared/cardTable.hpp"
  37 #include "gc/shared/collectedHeap.hpp"
  38 #include "gc/shared/tlab_globals.hpp"
  39 #include "interpreter/bytecodeHistogram.hpp"
  40 #include "interpreter/interpreter.hpp"
  41 #include "interpreter/interpreterRuntime.hpp"
  42 #include "jvm.h"
  43 #include "memory/resourceArea.hpp"
  44 #include "memory/universe.hpp"
  45 #include "nativeInst_aarch64.hpp"
  46 #include "oops/accessDecorators.hpp"
  47 #include "oops/compressedKlass.inline.hpp"
  48 #include "oops/compressedOops.inline.hpp"
  49 #include "oops/klass.inline.hpp"

  50 #include "runtime/continuation.hpp"

  51 #include "runtime/icache.hpp"
  52 #include "runtime/interfaceSupport.inline.hpp"
  53 #include "runtime/javaThread.hpp"
  54 #include "runtime/jniHandles.inline.hpp"
  55 #include "runtime/sharedRuntime.hpp"

  56 #include "runtime/stubRoutines.hpp"
  57 #include "utilities/globalDefinitions.hpp"
  58 #include "utilities/powerOfTwo.hpp"

  59 #ifdef COMPILER1
  60 #include "c1/c1_LIRAssembler.hpp"
  61 #endif
  62 #ifdef COMPILER2
  63 #include "oops/oop.hpp"
  64 #include "opto/compile.hpp"
  65 #include "opto/node.hpp"
  66 #include "opto/output.hpp"
  67 #endif
  68 
  69 #include <sys/types.h>
  70 
  71 #ifdef PRODUCT
  72 #define BLOCK_COMMENT(str) /* nothing */
  73 #else
  74 #define BLOCK_COMMENT(str) block_comment(str)
  75 #endif
  76 #define STOP(str) stop(str);
  77 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
  78 

2049   ldarb(scratch, scratch);
2050   cmp(scratch, InstanceKlass::fully_initialized);
2051   br(Assembler::EQ, *L_fast_path);
2052 
2053   // Fast path check: current thread is initializer thread
2054   ldr(scratch, Address(klass, InstanceKlass::init_thread_offset()));
2055   cmp(rthread, scratch);
2056 
2057   if (L_slow_path == &L_fallthrough) {
2058     br(Assembler::EQ, *L_fast_path);
2059     bind(*L_slow_path);
2060   } else if (L_fast_path == &L_fallthrough) {
2061     br(Assembler::NE, *L_slow_path);
2062     bind(*L_fast_path);
2063   } else {
2064     Unimplemented();
2065   }
2066 }
2067 
2068 void MacroAssembler::_verify_oop(Register reg, const char* s, const char* file, int line) {
2069   if (!VerifyOops) return;




2070 
2071   // Pass register number to verify_oop_subroutine
2072   const char* b = nullptr;
2073   {
2074     ResourceMark rm;
2075     stringStream ss;
2076     ss.print("verify_oop: %s: %s (%s:%d)", reg->name(), s, file, line);
2077     b = code_string(ss.as_string());
2078   }
2079   BLOCK_COMMENT("verify_oop {");
2080 
2081   strip_return_address(); // This might happen within a stack frame.
2082   protect_return_address();
2083   stp(r0, rscratch1, Address(pre(sp, -2 * wordSize)));
2084   stp(rscratch2, lr, Address(pre(sp, -2 * wordSize)));
2085 
2086   mov(r0, reg);
2087   movptr(rscratch1, (uintptr_t)(address)b);
2088 
2089   // call indirectly to solve generation ordering problem
2090   lea(rscratch2, RuntimeAddress(StubRoutines::verify_oop_subroutine_entry_address()));
2091   ldr(rscratch2, Address(rscratch2));
2092   blr(rscratch2);
2093 
2094   ldp(rscratch2, lr, Address(post(sp, 2 * wordSize)));
2095   ldp(r0, rscratch1, Address(post(sp, 2 * wordSize)));
2096   authenticate_return_address();
2097 
2098   BLOCK_COMMENT("} verify_oop");
2099 }
2100 
2101 void MacroAssembler::_verify_oop_addr(Address addr, const char* s, const char* file, int line) {
2102   if (!VerifyOops) return;




2103 
2104   const char* b = nullptr;
2105   {
2106     ResourceMark rm;
2107     stringStream ss;
2108     ss.print("verify_oop_addr: %s (%s:%d)", s, file, line);
2109     b = code_string(ss.as_string());
2110   }
2111   BLOCK_COMMENT("verify_oop_addr {");
2112 
2113   strip_return_address(); // This might happen within a stack frame.
2114   protect_return_address();
2115   stp(r0, rscratch1, Address(pre(sp, -2 * wordSize)));
2116   stp(rscratch2, lr, Address(pre(sp, -2 * wordSize)));
2117 
2118   // addr may contain sp so we will have to adjust it based on the
2119   // pushes that we just did.
2120   if (addr.uses(sp)) {
2121     lea(r0, addr);
2122     ldr(r0, Address(r0, 4 * wordSize));

2180   call_VM_leaf_base(entry_point, 1);
2181 }
2182 
2183 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0, Register arg_1) {
2184   assert_different_registers(arg_1, c_rarg0);
2185   pass_arg0(this, arg_0);
2186   pass_arg1(this, arg_1);
2187   call_VM_leaf_base(entry_point, 2);
2188 }
2189 
2190 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0,
2191                                   Register arg_1, Register arg_2) {
2192   assert_different_registers(arg_1, c_rarg0);
2193   assert_different_registers(arg_2, c_rarg0, c_rarg1);
2194   pass_arg0(this, arg_0);
2195   pass_arg1(this, arg_1);
2196   pass_arg2(this, arg_2);
2197   call_VM_leaf_base(entry_point, 3);
2198 }
2199 




2200 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0) {
2201   pass_arg0(this, arg_0);
2202   MacroAssembler::call_VM_leaf_base(entry_point, 1);
2203 }
2204 
2205 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1) {
2206 
2207   assert_different_registers(arg_0, c_rarg1);
2208   pass_arg1(this, arg_1);
2209   pass_arg0(this, arg_0);
2210   MacroAssembler::call_VM_leaf_base(entry_point, 2);
2211 }
2212 
2213 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2) {
2214   assert_different_registers(arg_0, c_rarg1, c_rarg2);
2215   assert_different_registers(arg_1, c_rarg2);
2216   pass_arg2(this, arg_2);
2217   pass_arg1(this, arg_1);
2218   pass_arg0(this, arg_0);
2219   MacroAssembler::call_VM_leaf_base(entry_point, 3);

2225   assert_different_registers(arg_2, c_rarg3);
2226   pass_arg3(this, arg_3);
2227   pass_arg2(this, arg_2);
2228   pass_arg1(this, arg_1);
2229   pass_arg0(this, arg_0);
2230   MacroAssembler::call_VM_leaf_base(entry_point, 4);
2231 }
2232 
2233 void MacroAssembler::null_check(Register reg, int offset) {
2234   if (needs_explicit_null_check(offset)) {
2235     // provoke OS null exception if reg is null by
2236     // accessing M[reg] w/o changing any registers
2237     // NOTE: this is plenty to provoke a segv
2238     ldr(zr, Address(reg));
2239   } else {
2240     // nothing to do, (later) access of M[reg + offset]
2241     // will provoke OS null exception if reg is null
2242   }
2243 }
2244 
























































































2245 // MacroAssembler protected routines needed to implement
2246 // public methods
2247 
2248 void MacroAssembler::mov(Register r, Address dest) {
2249   code_section()->relocate(pc(), dest.rspec());
2250   uint64_t imm64 = (uint64_t)dest.target();
2251   movptr(r, imm64);
2252 }
2253 
2254 // Move a constant pointer into r.  In AArch64 mode the virtual
2255 // address space is 48 bits in size, so we only need three
2256 // instructions to create a patchable instruction sequence that can
2257 // reach anywhere.
2258 void MacroAssembler::movptr(Register r, uintptr_t imm64) {
2259 #ifndef PRODUCT
2260   {
2261     char buffer[64];
2262     snprintf(buffer, sizeof(buffer), "0x%" PRIX64, (uint64_t)imm64);
2263     block_comment(buffer);
2264   }

5016   adrp(rscratch1, src2, offset);
5017   ldr(rscratch1, Address(rscratch1, offset));
5018   cmp(src1, rscratch1);
5019 }
5020 
5021 void MacroAssembler::cmpoop(Register obj1, Register obj2) {
5022   cmp(obj1, obj2);
5023 }
5024 
5025 void MacroAssembler::load_method_holder_cld(Register rresult, Register rmethod) {
5026   load_method_holder(rresult, rmethod);
5027   ldr(rresult, Address(rresult, InstanceKlass::class_loader_data_offset()));
5028 }
5029 
5030 void MacroAssembler::load_method_holder(Register holder, Register method) {
5031   ldr(holder, Address(method, Method::const_offset()));                      // ConstMethod*
5032   ldr(holder, Address(holder, ConstMethod::constants_offset()));             // ConstantPool*
5033   ldr(holder, Address(holder, ConstantPool::pool_holder_offset()));          // InstanceKlass*
5034 }
5035 










5036 // Loads the obj's Klass* into dst.
5037 // Preserves all registers (incl src, rscratch1 and rscratch2).
5038 // Input:
5039 // src - the oop we want to load the klass from.
5040 // dst - output narrow klass.
5041 void MacroAssembler::load_narrow_klass_compact(Register dst, Register src) {
5042   assert(UseCompactObjectHeaders, "expects UseCompactObjectHeaders");
5043   ldr(dst, Address(src, oopDesc::mark_offset_in_bytes()));
5044   lsr(dst, dst, markWord::klass_shift);
5045 }
5046 
5047 void MacroAssembler::load_klass(Register dst, Register src) {
5048   if (UseCompactObjectHeaders) {
5049     load_narrow_klass_compact(dst, src);
5050     decode_klass_not_null(dst);
5051   } else if (UseCompressedClassPointers) {
5052     ldrw(dst, Address(src, oopDesc::klass_offset_in_bytes()));
5053     decode_klass_not_null(dst);
5054   } else {
5055     ldr(dst, Address(src, oopDesc::klass_offset_in_bytes()));

5126   }
5127   cmp(klass, tmp);
5128 }
5129 
5130 void MacroAssembler::cmp_klasses_from_objects(Register obj1, Register obj2, Register tmp1, Register tmp2) {
5131   if (UseCompactObjectHeaders) {
5132     load_narrow_klass_compact(tmp1, obj1);
5133     load_narrow_klass_compact(tmp2,  obj2);
5134     cmpw(tmp1, tmp2);
5135   } else if (UseCompressedClassPointers) {
5136     ldrw(tmp1, Address(obj1, oopDesc::klass_offset_in_bytes()));
5137     ldrw(tmp2, Address(obj2, oopDesc::klass_offset_in_bytes()));
5138     cmpw(tmp1, tmp2);
5139   } else {
5140     ldr(tmp1, Address(obj1, oopDesc::klass_offset_in_bytes()));
5141     ldr(tmp2, Address(obj2, oopDesc::klass_offset_in_bytes()));
5142     cmp(tmp1, tmp2);
5143   }
5144 }
5145 





5146 void MacroAssembler::store_klass(Register dst, Register src) {
5147   // FIXME: Should this be a store release?  concurrent gcs assumes
5148   // klass length is valid if klass field is not null.
5149   assert(!UseCompactObjectHeaders, "not with compact headers");
5150   if (UseCompressedClassPointers) {
5151     encode_klass_not_null(src);
5152     strw(src, Address(dst, oopDesc::klass_offset_in_bytes()));
5153   } else {
5154     str(src, Address(dst, oopDesc::klass_offset_in_bytes()));
5155   }
5156 }
5157 
5158 void MacroAssembler::store_klass_gap(Register dst, Register src) {
5159   assert(!UseCompactObjectHeaders, "not with compact headers");
5160   if (UseCompressedClassPointers) {
5161     // Store to klass gap in destination
5162     strw(src, Address(dst, oopDesc::klass_gap_offset_in_bytes()));
5163   }
5164 }
5165 

5527   if (as_raw) {
5528     bs->BarrierSetAssembler::load_at(this, decorators, type, dst, src, tmp1, tmp2);
5529   } else {
5530     bs->load_at(this, decorators, type, dst, src, tmp1, tmp2);
5531   }
5532 }
5533 
5534 void MacroAssembler::access_store_at(BasicType type, DecoratorSet decorators,
5535                                      Address dst, Register val,
5536                                      Register tmp1, Register tmp2, Register tmp3) {
5537   BarrierSetAssembler *bs = BarrierSet::barrier_set()->barrier_set_assembler();
5538   decorators = AccessInternal::decorator_fixup(decorators, type);
5539   bool as_raw = (decorators & AS_RAW) != 0;
5540   if (as_raw) {
5541     bs->BarrierSetAssembler::store_at(this, decorators, type, dst, val, tmp1, tmp2, tmp3);
5542   } else {
5543     bs->store_at(this, decorators, type, dst, val, tmp1, tmp2, tmp3);
5544   }
5545 }
5546 








































5547 void MacroAssembler::load_heap_oop(Register dst, Address src, Register tmp1,
5548                                    Register tmp2, DecoratorSet decorators) {
5549   access_load_at(T_OBJECT, IN_HEAP | decorators, dst, src, tmp1, tmp2);
5550 }
5551 
5552 void MacroAssembler::load_heap_oop_not_null(Register dst, Address src, Register tmp1,
5553                                             Register tmp2, DecoratorSet decorators) {
5554   access_load_at(T_OBJECT, IN_HEAP | IS_NOT_NULL | decorators, dst, src, tmp1, tmp2);
5555 }
5556 
5557 void MacroAssembler::store_heap_oop(Address dst, Register val, Register tmp1,
5558                                     Register tmp2, Register tmp3, DecoratorSet decorators) {
5559   access_store_at(T_OBJECT, IN_HEAP | decorators, dst, val, tmp1, tmp2, tmp3);
5560 }
5561 
5562 // Used for storing nulls.
5563 void MacroAssembler::store_heap_oop_null(Address dst) {
5564   access_store_at(T_OBJECT, IN_HEAP, dst, noreg, noreg, noreg, noreg);
5565 }
5566 

5602     oop_index = oop_recorder()->allocate_metadata_index(obj);
5603   } else {
5604     oop_index = oop_recorder()->find_index(obj);
5605   }
5606   RelocationHolder rspec = metadata_Relocation::spec(oop_index);
5607   mov(dst, Address((address)obj, rspec));
5608 }
5609 
5610 Address MacroAssembler::constant_oop_address(jobject obj) {
5611 #ifdef ASSERT
5612   {
5613     ThreadInVMfromUnknown tiv;
5614     assert(oop_recorder() != nullptr, "this assembler needs an OopRecorder");
5615     assert(Universe::heap()->is_in(JNIHandles::resolve(obj)), "not an oop");
5616   }
5617 #endif
5618   int oop_index = oop_recorder()->find_index(obj);
5619   return Address((address)obj, oop_Relocation::spec(oop_index));
5620 }
5621 






































































































5622 // Defines obj, preserves var_size_in_bytes, okay for t2 == var_size_in_bytes.
5623 void MacroAssembler::tlab_allocate(Register obj,
5624                                    Register var_size_in_bytes,
5625                                    int con_size_in_bytes,
5626                                    Register t1,
5627                                    Register t2,
5628                                    Label& slow_case) {
5629   BarrierSetAssembler *bs = BarrierSet::barrier_set()->barrier_set_assembler();
5630   bs->tlab_allocate(this, obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
5631 }
5632 
5633 void MacroAssembler::inc_held_monitor_count(Register tmp) {
5634   Address dst(rthread, JavaThread::held_monitor_count_offset());
5635 #ifdef ASSERT
5636   ldr(tmp, dst);
5637   increment(tmp);
5638   str(tmp, dst);
5639   Label ok;
5640   tbz(tmp, 63, ok);
5641   STOP("assert(held monitor count underflow)");

5673     ldr(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_start_offset())));
5674     cmp(rscratch2, rscratch1);
5675     br(Assembler::HS, next);
5676     STOP("assert(top >= start)");
5677     should_not_reach_here();
5678 
5679     bind(next);
5680     ldr(rscratch2, Address(rthread, in_bytes(JavaThread::tlab_end_offset())));
5681     ldr(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_top_offset())));
5682     cmp(rscratch2, rscratch1);
5683     br(Assembler::HS, ok);
5684     STOP("assert(top <= end)");
5685     should_not_reach_here();
5686 
5687     bind(ok);
5688     ldp(rscratch2, rscratch1, Address(post(sp, 16)));
5689   }
5690 #endif
5691 }
5692 




















5693 // Writes to stack successive pages until offset reached to check for
5694 // stack overflow + shadow pages.  This clobbers tmp.
5695 void MacroAssembler::bang_stack_size(Register size, Register tmp) {
5696   assert_different_registers(tmp, size, rscratch1);
5697   mov(tmp, sp);
5698   // Bang stack for total size given plus shadow page size.
5699   // Bang one page at a time because large size can bang beyond yellow and
5700   // red zones.
5701   Label loop;
5702   mov(rscratch1, (int)os::vm_page_size());
5703   bind(loop);
5704   lea(tmp, Address(tmp, -(int)os::vm_page_size()));
5705   subsw(size, size, rscratch1);
5706   str(size, Address(tmp));
5707   br(Assembler::GT, loop);
5708 
5709   // Bang down shadow pages too.
5710   // At this point, (tmp-0) is the last address touched, so don't
5711   // touch it again.  (It was touched as (tmp-pagesize) but then tmp
5712   // was post-decremented.)  Skip this address by starting at i=1, and

5798 }
5799 
5800 void MacroAssembler::remove_frame(int framesize) {
5801   assert(framesize >= 2 * wordSize, "framesize must include space for FP/LR");
5802   assert(framesize % (2*wordSize) == 0, "must preserve 2*wordSize alignment");
5803   if (framesize < ((1 << 9) + 2 * wordSize)) {
5804     ldp(rfp, lr, Address(sp, framesize - 2 * wordSize));
5805     add(sp, sp, framesize);
5806   } else {
5807     if (framesize < ((1 << 12) + 2 * wordSize))
5808       add(sp, sp, framesize - 2 * wordSize);
5809     else {
5810       mov(rscratch1, framesize - 2 * wordSize);
5811       add(sp, sp, rscratch1);
5812     }
5813     ldp(rfp, lr, Address(post(sp, 2 * wordSize)));
5814   }
5815   authenticate_return_address();
5816 }
5817 






























































5818 
5819 // This method counts leading positive bytes (highest bit not set) in provided byte array
5820 address MacroAssembler::count_positives(Register ary1, Register len, Register result) {
5821     // Simple and most common case of aligned small array which is not at the
5822     // end of memory page is placed here. All other cases are in stub.
5823     Label LOOP, END, STUB, STUB_LONG, SET_RESULT, DONE;
5824     const uint64_t UPPER_BIT_MASK=0x8080808080808080;
5825     assert_different_registers(ary1, len, result);
5826 
5827     mov(result, len);
5828     cmpw(len, 0);
5829     br(LE, DONE);
5830     cmpw(len, 4 * wordSize);
5831     br(GE, STUB_LONG); // size > 32 then go to stub
5832 
5833     int shift = 64 - exact_log2(os::vm_page_size());
5834     lsl(rscratch1, ary1, shift);
5835     mov(rscratch2, (size_t)(4 * wordSize) << shift);
5836     adds(rscratch2, rscratch1, rscratch2);  // At end of page?
5837     br(CS, STUB); // at the end of page then go to stub

6715 // On other systems, the helper is a usual C function.
6716 //
6717 void MacroAssembler::get_thread(Register dst) {
6718   RegSet saved_regs =
6719     LINUX_ONLY(RegSet::range(r0, r1)  + lr - dst)
6720     NOT_LINUX (RegSet::range(r0, r17) + lr - dst);
6721 
6722   protect_return_address();
6723   push(saved_regs, sp);
6724 
6725   mov(lr, ExternalAddress(CAST_FROM_FN_PTR(address, JavaThread::aarch64_get_thread_helper)));
6726   blr(lr);
6727   if (dst != c_rarg0) {
6728     mov(dst, c_rarg0);
6729   }
6730 
6731   pop(saved_regs, sp);
6732   authenticate_return_address();
6733 }
6734 
































































































































































































































































































































































































































































6735 void MacroAssembler::cache_wb(Address line) {
6736   assert(line.getMode() == Address::base_plus_offset, "mode should be base_plus_offset");
6737   assert(line.index() == noreg, "index should be noreg");
6738   assert(line.offset() == 0, "offset should be 0");
6739   // would like to assert this
6740   // assert(line._ext.shift == 0, "shift should be zero");
6741   if (VM_Version::supports_dcpop()) {
6742     // writeback using clear virtual address to point of persistence
6743     dc(Assembler::CVAP, line.base());
6744   } else {
6745     // no need to generate anything as Unsafe.writebackMemory should
6746     // never invoke this stub
6747   }
6748 }
6749 
6750 void MacroAssembler::cache_wbsync(bool is_pre) {
6751   // we only need a barrier post sync
6752   if (!is_pre) {
6753     membar(Assembler::AnyAny);
6754   }

7125   }
7126 
7127   // Check if the lock-stack is full.
7128   ldrw(top, Address(rthread, JavaThread::lock_stack_top_offset()));
7129   cmpw(top, (unsigned)LockStack::end_offset());
7130   br(Assembler::GE, slow);
7131 
7132   // Check for recursion.
7133   subw(t, top, oopSize);
7134   ldr(t, Address(rthread, t));
7135   cmp(obj, t);
7136   br(Assembler::EQ, push);
7137 
7138   // Check header for monitor (0b10).
7139   tst(mark, markWord::monitor_value);
7140   br(Assembler::NE, slow);
7141 
7142   // Try to lock. Transition lock bits 0b01 => 0b00
7143   assert(oopDesc::mark_offset_in_bytes() == 0, "required to avoid lea");
7144   orr(mark, mark, markWord::unlocked_value);




7145   eor(t, mark, markWord::unlocked_value);
7146   cmpxchg(/*addr*/ obj, /*expected*/ mark, /*new*/ t, Assembler::xword,
7147           /*acquire*/ true, /*release*/ false, /*weak*/ false, noreg);
7148   br(Assembler::NE, slow);
7149 
7150   bind(push);
7151   // After successful lock, push object on lock-stack.
7152   str(obj, Address(rthread, top));
7153   addw(top, top, oopSize);
7154   strw(top, Address(rthread, JavaThread::lock_stack_top_offset()));
7155 }
7156 
7157 // Implements lightweight-unlocking.
7158 //
7159 // - obj: the object to be unlocked
7160 // - t1, t2, t3: temporary registers
7161 // - slow: branched to if unlocking fails, absolute offset may larger than 32KB (imm14 encoding).
7162 void MacroAssembler::lightweight_unlock(Register obj, Register t1, Register t2, Register t3, Label& slow) {
7163   // cmpxchg clobbers rscratch1.
7164   assert_different_registers(obj, t1, t2, t3, rscratch1);

   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #include "asm/assembler.hpp"
  27 #include "asm/assembler.inline.hpp"
  28 #include "ci/ciEnv.hpp"
  29 #include "ci/ciInlineKlass.hpp"
  30 #include "code/compiledIC.hpp"
  31 #include "compiler/compileTask.hpp"
  32 #include "compiler/disassembler.hpp"
  33 #include "compiler/oopMap.hpp"
  34 #include "gc/shared/barrierSet.hpp"
  35 #include "gc/shared/barrierSetAssembler.hpp"
  36 #include "gc/shared/cardTableBarrierSet.hpp"
  37 #include "gc/shared/cardTable.hpp"
  38 #include "gc/shared/collectedHeap.hpp"
  39 #include "gc/shared/tlab_globals.hpp"
  40 #include "interpreter/bytecodeHistogram.hpp"
  41 #include "interpreter/interpreter.hpp"
  42 #include "interpreter/interpreterRuntime.hpp"
  43 #include "jvm.h"
  44 #include "memory/resourceArea.hpp"
  45 #include "memory/universe.hpp"
  46 #include "nativeInst_aarch64.hpp"
  47 #include "oops/accessDecorators.hpp"
  48 #include "oops/compressedKlass.inline.hpp"
  49 #include "oops/compressedOops.inline.hpp"
  50 #include "oops/klass.inline.hpp"
  51 #include "oops/resolvedFieldEntry.hpp"
  52 #include "runtime/continuation.hpp"
  53 #include "runtime/globals.hpp"
  54 #include "runtime/icache.hpp"
  55 #include "runtime/interfaceSupport.inline.hpp"
  56 #include "runtime/javaThread.hpp"
  57 #include "runtime/jniHandles.inline.hpp"
  58 #include "runtime/sharedRuntime.hpp"
  59 #include "runtime/signature_cc.hpp"
  60 #include "runtime/stubRoutines.hpp"
  61 #include "utilities/globalDefinitions.hpp"
  62 #include "utilities/powerOfTwo.hpp"
  63 #include "vmreg_aarch64.inline.hpp"
  64 #ifdef COMPILER1
  65 #include "c1/c1_LIRAssembler.hpp"
  66 #endif
  67 #ifdef COMPILER2
  68 #include "oops/oop.hpp"
  69 #include "opto/compile.hpp"
  70 #include "opto/node.hpp"
  71 #include "opto/output.hpp"
  72 #endif
  73 
  74 #include <sys/types.h>
  75 
  76 #ifdef PRODUCT
  77 #define BLOCK_COMMENT(str) /* nothing */
  78 #else
  79 #define BLOCK_COMMENT(str) block_comment(str)
  80 #endif
  81 #define STOP(str) stop(str);
  82 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
  83 

2054   ldarb(scratch, scratch);
2055   cmp(scratch, InstanceKlass::fully_initialized);
2056   br(Assembler::EQ, *L_fast_path);
2057 
2058   // Fast path check: current thread is initializer thread
2059   ldr(scratch, Address(klass, InstanceKlass::init_thread_offset()));
2060   cmp(rthread, scratch);
2061 
2062   if (L_slow_path == &L_fallthrough) {
2063     br(Assembler::EQ, *L_fast_path);
2064     bind(*L_slow_path);
2065   } else if (L_fast_path == &L_fallthrough) {
2066     br(Assembler::NE, *L_slow_path);
2067     bind(*L_fast_path);
2068   } else {
2069     Unimplemented();
2070   }
2071 }
2072 
2073 void MacroAssembler::_verify_oop(Register reg, const char* s, const char* file, int line) {
2074   if (!VerifyOops || VerifyAdapterSharing) {
2075     // Below address of the code string confuses VerifyAdapterSharing
2076     // because it may differ between otherwise equivalent adapters.
2077     return;
2078   }
2079 
2080   // Pass register number to verify_oop_subroutine
2081   const char* b = nullptr;
2082   {
2083     ResourceMark rm;
2084     stringStream ss;
2085     ss.print("verify_oop: %s: %s (%s:%d)", reg->name(), s, file, line);
2086     b = code_string(ss.as_string());
2087   }
2088   BLOCK_COMMENT("verify_oop {");
2089 
2090   strip_return_address(); // This might happen within a stack frame.
2091   protect_return_address();
2092   stp(r0, rscratch1, Address(pre(sp, -2 * wordSize)));
2093   stp(rscratch2, lr, Address(pre(sp, -2 * wordSize)));
2094 
2095   mov(r0, reg);
2096   movptr(rscratch1, (uintptr_t)(address)b);
2097 
2098   // call indirectly to solve generation ordering problem
2099   lea(rscratch2, RuntimeAddress(StubRoutines::verify_oop_subroutine_entry_address()));
2100   ldr(rscratch2, Address(rscratch2));
2101   blr(rscratch2);
2102 
2103   ldp(rscratch2, lr, Address(post(sp, 2 * wordSize)));
2104   ldp(r0, rscratch1, Address(post(sp, 2 * wordSize)));
2105   authenticate_return_address();
2106 
2107   BLOCK_COMMENT("} verify_oop");
2108 }
2109 
2110 void MacroAssembler::_verify_oop_addr(Address addr, const char* s, const char* file, int line) {
2111   if (!VerifyOops || VerifyAdapterSharing) {
2112     // Below address of the code string confuses VerifyAdapterSharing
2113     // because it may differ between otherwise equivalent adapters.
2114     return;
2115   }
2116 
2117   const char* b = nullptr;
2118   {
2119     ResourceMark rm;
2120     stringStream ss;
2121     ss.print("verify_oop_addr: %s (%s:%d)", s, file, line);
2122     b = code_string(ss.as_string());
2123   }
2124   BLOCK_COMMENT("verify_oop_addr {");
2125 
2126   strip_return_address(); // This might happen within a stack frame.
2127   protect_return_address();
2128   stp(r0, rscratch1, Address(pre(sp, -2 * wordSize)));
2129   stp(rscratch2, lr, Address(pre(sp, -2 * wordSize)));
2130 
2131   // addr may contain sp so we will have to adjust it based on the
2132   // pushes that we just did.
2133   if (addr.uses(sp)) {
2134     lea(r0, addr);
2135     ldr(r0, Address(r0, 4 * wordSize));

2193   call_VM_leaf_base(entry_point, 1);
2194 }
2195 
2196 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0, Register arg_1) {
2197   assert_different_registers(arg_1, c_rarg0);
2198   pass_arg0(this, arg_0);
2199   pass_arg1(this, arg_1);
2200   call_VM_leaf_base(entry_point, 2);
2201 }
2202 
2203 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0,
2204                                   Register arg_1, Register arg_2) {
2205   assert_different_registers(arg_1, c_rarg0);
2206   assert_different_registers(arg_2, c_rarg0, c_rarg1);
2207   pass_arg0(this, arg_0);
2208   pass_arg1(this, arg_1);
2209   pass_arg2(this, arg_2);
2210   call_VM_leaf_base(entry_point, 3);
2211 }
2212 
2213 void MacroAssembler::super_call_VM_leaf(address entry_point) {
2214   MacroAssembler::call_VM_leaf_base(entry_point, 1);
2215 }
2216 
2217 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0) {
2218   pass_arg0(this, arg_0);
2219   MacroAssembler::call_VM_leaf_base(entry_point, 1);
2220 }
2221 
2222 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1) {
2223 
2224   assert_different_registers(arg_0, c_rarg1);
2225   pass_arg1(this, arg_1);
2226   pass_arg0(this, arg_0);
2227   MacroAssembler::call_VM_leaf_base(entry_point, 2);
2228 }
2229 
2230 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2) {
2231   assert_different_registers(arg_0, c_rarg1, c_rarg2);
2232   assert_different_registers(arg_1, c_rarg2);
2233   pass_arg2(this, arg_2);
2234   pass_arg1(this, arg_1);
2235   pass_arg0(this, arg_0);
2236   MacroAssembler::call_VM_leaf_base(entry_point, 3);

2242   assert_different_registers(arg_2, c_rarg3);
2243   pass_arg3(this, arg_3);
2244   pass_arg2(this, arg_2);
2245   pass_arg1(this, arg_1);
2246   pass_arg0(this, arg_0);
2247   MacroAssembler::call_VM_leaf_base(entry_point, 4);
2248 }
2249 
2250 void MacroAssembler::null_check(Register reg, int offset) {
2251   if (needs_explicit_null_check(offset)) {
2252     // provoke OS null exception if reg is null by
2253     // accessing M[reg] w/o changing any registers
2254     // NOTE: this is plenty to provoke a segv
2255     ldr(zr, Address(reg));
2256   } else {
2257     // nothing to do, (later) access of M[reg + offset]
2258     // will provoke OS null exception if reg is null
2259   }
2260 }
2261 
2262 void MacroAssembler::test_markword_is_inline_type(Register markword, Label& is_inline_type) {
2263   assert_different_registers(markword, rscratch2);
2264   mov(rscratch2, markWord::inline_type_mask_in_place);
2265   andr(markword, markword, rscratch2);
2266   mov(rscratch2, markWord::inline_type_pattern);
2267   cmp(markword, rscratch2);
2268   br(Assembler::EQ, is_inline_type);
2269 }
2270 
2271 void MacroAssembler::test_oop_is_not_inline_type(Register object, Register tmp, Label& not_inline_type, bool can_be_null) {
2272   assert_different_registers(tmp, rscratch1);
2273   if (can_be_null) {
2274     cbz(object, not_inline_type);
2275   }
2276   const int is_inline_type_mask = markWord::inline_type_pattern;
2277   ldr(tmp, Address(object, oopDesc::mark_offset_in_bytes()));
2278   mov(rscratch1, is_inline_type_mask);
2279   andr(tmp, tmp, rscratch1);
2280   cmp(tmp, rscratch1);
2281   br(Assembler::NE, not_inline_type);
2282 }
2283 
2284 void MacroAssembler::test_field_is_null_free_inline_type(Register flags, Register temp_reg, Label& is_null_free_inline_type) {
2285   assert(temp_reg == noreg, "not needed"); // keep signature uniform with x86
2286   tbnz(flags, ResolvedFieldEntry::is_null_free_inline_type_shift, is_null_free_inline_type);
2287 }
2288 
2289 void MacroAssembler::test_field_is_not_null_free_inline_type(Register flags, Register temp_reg, Label& not_null_free_inline_type) {
2290   assert(temp_reg == noreg, "not needed"); // keep signature uniform with x86
2291   tbz(flags, ResolvedFieldEntry::is_null_free_inline_type_shift, not_null_free_inline_type);
2292 }
2293 
2294 void MacroAssembler::test_field_is_flat(Register flags, Register temp_reg, Label& is_flat) {
2295   assert(temp_reg == noreg, "not needed"); // keep signature uniform with x86
2296   tbnz(flags, ResolvedFieldEntry::is_flat_shift, is_flat);
2297 }
2298 
2299 void MacroAssembler::test_field_has_null_marker(Register flags, Register temp_reg, Label& has_null_marker) {
2300   assert(temp_reg == noreg, "not needed"); // keep signature uniform with x86
2301   tbnz(flags, ResolvedFieldEntry::has_null_marker_shift, has_null_marker);
2302 }
2303 
2304 void MacroAssembler::test_oop_prototype_bit(Register oop, Register temp_reg, int32_t test_bit, bool jmp_set, Label& jmp_label) {
2305   Label test_mark_word;
2306   // load mark word
2307   ldr(temp_reg, Address(oop, oopDesc::mark_offset_in_bytes()));
2308   // check displaced
2309   tst(temp_reg, markWord::unlocked_value);
2310   br(Assembler::NE, test_mark_word);
2311   // slow path use klass prototype
2312   load_prototype_header(temp_reg, oop);
2313 
2314   bind(test_mark_word);
2315   andr(temp_reg, temp_reg, test_bit);
2316   if (jmp_set) {
2317     cbnz(temp_reg, jmp_label);
2318   } else {
2319     cbz(temp_reg, jmp_label);
2320   }
2321 }
2322 
2323 void MacroAssembler::test_flat_array_oop(Register oop, Register temp_reg, Label& is_flat_array) {
2324   test_oop_prototype_bit(oop, temp_reg, markWord::flat_array_bit_in_place, true, is_flat_array);
2325 }
2326 
2327 void MacroAssembler::test_non_flat_array_oop(Register oop, Register temp_reg,
2328                                                   Label&is_non_flat_array) {
2329   test_oop_prototype_bit(oop, temp_reg, markWord::flat_array_bit_in_place, false, is_non_flat_array);
2330 }
2331 
2332 void MacroAssembler::test_null_free_array_oop(Register oop, Register temp_reg, Label& is_null_free_array) {
2333   test_oop_prototype_bit(oop, temp_reg, markWord::null_free_array_bit_in_place, true, is_null_free_array);
2334 }
2335 
2336 void MacroAssembler::test_non_null_free_array_oop(Register oop, Register temp_reg, Label&is_non_null_free_array) {
2337   test_oop_prototype_bit(oop, temp_reg, markWord::null_free_array_bit_in_place, false, is_non_null_free_array);
2338 }
2339 
2340 void MacroAssembler::test_flat_array_layout(Register lh, Label& is_flat_array) {
2341   tst(lh, Klass::_lh_array_tag_flat_value_bit_inplace);
2342   br(Assembler::NE, is_flat_array);
2343 }
2344 
2345 void MacroAssembler::test_non_flat_array_layout(Register lh, Label& is_non_flat_array) {
2346   tst(lh, Klass::_lh_array_tag_flat_value_bit_inplace);
2347   br(Assembler::EQ, is_non_flat_array);
2348 }
2349 
2350 // MacroAssembler protected routines needed to implement
2351 // public methods
2352 
2353 void MacroAssembler::mov(Register r, Address dest) {
2354   code_section()->relocate(pc(), dest.rspec());
2355   uint64_t imm64 = (uint64_t)dest.target();
2356   movptr(r, imm64);
2357 }
2358 
2359 // Move a constant pointer into r.  In AArch64 mode the virtual
2360 // address space is 48 bits in size, so we only need three
2361 // instructions to create a patchable instruction sequence that can
2362 // reach anywhere.
2363 void MacroAssembler::movptr(Register r, uintptr_t imm64) {
2364 #ifndef PRODUCT
2365   {
2366     char buffer[64];
2367     snprintf(buffer, sizeof(buffer), "0x%" PRIX64, (uint64_t)imm64);
2368     block_comment(buffer);
2369   }

5121   adrp(rscratch1, src2, offset);
5122   ldr(rscratch1, Address(rscratch1, offset));
5123   cmp(src1, rscratch1);
5124 }
5125 
5126 void MacroAssembler::cmpoop(Register obj1, Register obj2) {
5127   cmp(obj1, obj2);
5128 }
5129 
5130 void MacroAssembler::load_method_holder_cld(Register rresult, Register rmethod) {
5131   load_method_holder(rresult, rmethod);
5132   ldr(rresult, Address(rresult, InstanceKlass::class_loader_data_offset()));
5133 }
5134 
5135 void MacroAssembler::load_method_holder(Register holder, Register method) {
5136   ldr(holder, Address(method, Method::const_offset()));                      // ConstMethod*
5137   ldr(holder, Address(holder, ConstMethod::constants_offset()));             // ConstantPool*
5138   ldr(holder, Address(holder, ConstantPool::pool_holder_offset()));          // InstanceKlass*
5139 }
5140 
5141 void MacroAssembler::load_metadata(Register dst, Register src) {
5142   if (UseCompactObjectHeaders) {
5143     load_narrow_klass_compact(dst, src);
5144   } else if (UseCompressedClassPointers) {
5145     ldrw(dst, Address(src, oopDesc::klass_offset_in_bytes()));
5146   } else {
5147     ldr(dst, Address(src, oopDesc::klass_offset_in_bytes()));
5148   }
5149 }
5150 
5151 // Loads the obj's Klass* into dst.
5152 // Preserves all registers (incl src, rscratch1 and rscratch2).
5153 // Input:
5154 // src - the oop we want to load the klass from.
5155 // dst - output narrow klass.
5156 void MacroAssembler::load_narrow_klass_compact(Register dst, Register src) {
5157   assert(UseCompactObjectHeaders, "expects UseCompactObjectHeaders");
5158   ldr(dst, Address(src, oopDesc::mark_offset_in_bytes()));
5159   lsr(dst, dst, markWord::klass_shift);
5160 }
5161 
5162 void MacroAssembler::load_klass(Register dst, Register src) {
5163   if (UseCompactObjectHeaders) {
5164     load_narrow_klass_compact(dst, src);
5165     decode_klass_not_null(dst);
5166   } else if (UseCompressedClassPointers) {
5167     ldrw(dst, Address(src, oopDesc::klass_offset_in_bytes()));
5168     decode_klass_not_null(dst);
5169   } else {
5170     ldr(dst, Address(src, oopDesc::klass_offset_in_bytes()));

5241   }
5242   cmp(klass, tmp);
5243 }
5244 
5245 void MacroAssembler::cmp_klasses_from_objects(Register obj1, Register obj2, Register tmp1, Register tmp2) {
5246   if (UseCompactObjectHeaders) {
5247     load_narrow_klass_compact(tmp1, obj1);
5248     load_narrow_klass_compact(tmp2,  obj2);
5249     cmpw(tmp1, tmp2);
5250   } else if (UseCompressedClassPointers) {
5251     ldrw(tmp1, Address(obj1, oopDesc::klass_offset_in_bytes()));
5252     ldrw(tmp2, Address(obj2, oopDesc::klass_offset_in_bytes()));
5253     cmpw(tmp1, tmp2);
5254   } else {
5255     ldr(tmp1, Address(obj1, oopDesc::klass_offset_in_bytes()));
5256     ldr(tmp2, Address(obj2, oopDesc::klass_offset_in_bytes()));
5257     cmp(tmp1, tmp2);
5258   }
5259 }
5260 
5261 void MacroAssembler::load_prototype_header(Register dst, Register src) {
5262   load_klass(dst, src);
5263   ldr(dst, Address(dst, Klass::prototype_header_offset()));
5264 }
5265 
5266 void MacroAssembler::store_klass(Register dst, Register src) {
5267   // FIXME: Should this be a store release?  concurrent gcs assumes
5268   // klass length is valid if klass field is not null.
5269   assert(!UseCompactObjectHeaders, "not with compact headers");
5270   if (UseCompressedClassPointers) {
5271     encode_klass_not_null(src);
5272     strw(src, Address(dst, oopDesc::klass_offset_in_bytes()));
5273   } else {
5274     str(src, Address(dst, oopDesc::klass_offset_in_bytes()));
5275   }
5276 }
5277 
5278 void MacroAssembler::store_klass_gap(Register dst, Register src) {
5279   assert(!UseCompactObjectHeaders, "not with compact headers");
5280   if (UseCompressedClassPointers) {
5281     // Store to klass gap in destination
5282     strw(src, Address(dst, oopDesc::klass_gap_offset_in_bytes()));
5283   }
5284 }
5285 

5647   if (as_raw) {
5648     bs->BarrierSetAssembler::load_at(this, decorators, type, dst, src, tmp1, tmp2);
5649   } else {
5650     bs->load_at(this, decorators, type, dst, src, tmp1, tmp2);
5651   }
5652 }
5653 
5654 void MacroAssembler::access_store_at(BasicType type, DecoratorSet decorators,
5655                                      Address dst, Register val,
5656                                      Register tmp1, Register tmp2, Register tmp3) {
5657   BarrierSetAssembler *bs = BarrierSet::barrier_set()->barrier_set_assembler();
5658   decorators = AccessInternal::decorator_fixup(decorators, type);
5659   bool as_raw = (decorators & AS_RAW) != 0;
5660   if (as_raw) {
5661     bs->BarrierSetAssembler::store_at(this, decorators, type, dst, val, tmp1, tmp2, tmp3);
5662   } else {
5663     bs->store_at(this, decorators, type, dst, val, tmp1, tmp2, tmp3);
5664   }
5665 }
5666 
5667 void MacroAssembler::flat_field_copy(DecoratorSet decorators, Register src, Register dst,
5668                                      Register inline_layout_info) {
5669   BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
5670   bs->flat_field_copy(this, decorators, src, dst, inline_layout_info);
5671 }
5672 
5673 void MacroAssembler::payload_offset(Register inline_klass, Register offset) {
5674   ldr(offset, Address(inline_klass, InstanceKlass::adr_inlineklass_fixed_block_offset()));
5675   ldrw(offset, Address(offset, InlineKlass::payload_offset_offset()));
5676 }
5677 
5678 void MacroAssembler::payload_address(Register oop, Register data, Register inline_klass) {
5679   // ((address) (void*) o) + vk->payload_offset();
5680   Register offset = (data == oop) ? rscratch1 : data;
5681   payload_offset(inline_klass, offset);
5682   if (data == oop) {
5683     add(data, data, offset);
5684   } else {
5685     lea(data, Address(oop, offset));
5686   }
5687 }
5688 
5689 void MacroAssembler::data_for_value_array_index(Register array, Register array_klass,
5690                                                 Register index, Register data) {
5691   assert_different_registers(array, array_klass, index);
5692   assert_different_registers(rscratch1, array, index);
5693 
5694   // array->base() + (index << Klass::layout_helper_log2_element_size(lh));
5695   ldrw(rscratch1, Address(array_klass, Klass::layout_helper_offset()));
5696 
5697   // Klass::layout_helper_log2_element_size(lh)
5698   // (lh >> _lh_log2_element_size_shift) & _lh_log2_element_size_mask;
5699   lsr(rscratch1, rscratch1, Klass::_lh_log2_element_size_shift);
5700   andr(rscratch1, rscratch1, Klass::_lh_log2_element_size_mask);
5701   lslv(index, index, rscratch1);
5702 
5703   add(data, array, index);
5704   add(data, data, arrayOopDesc::base_offset_in_bytes(T_FLAT_ELEMENT));
5705 }
5706 
5707 void MacroAssembler::load_heap_oop(Register dst, Address src, Register tmp1,
5708                                    Register tmp2, DecoratorSet decorators) {
5709   access_load_at(T_OBJECT, IN_HEAP | decorators, dst, src, tmp1, tmp2);
5710 }
5711 
5712 void MacroAssembler::load_heap_oop_not_null(Register dst, Address src, Register tmp1,
5713                                             Register tmp2, DecoratorSet decorators) {
5714   access_load_at(T_OBJECT, IN_HEAP | IS_NOT_NULL | decorators, dst, src, tmp1, tmp2);
5715 }
5716 
5717 void MacroAssembler::store_heap_oop(Address dst, Register val, Register tmp1,
5718                                     Register tmp2, Register tmp3, DecoratorSet decorators) {
5719   access_store_at(T_OBJECT, IN_HEAP | decorators, dst, val, tmp1, tmp2, tmp3);
5720 }
5721 
5722 // Used for storing nulls.
5723 void MacroAssembler::store_heap_oop_null(Address dst) {
5724   access_store_at(T_OBJECT, IN_HEAP, dst, noreg, noreg, noreg, noreg);
5725 }
5726 

5762     oop_index = oop_recorder()->allocate_metadata_index(obj);
5763   } else {
5764     oop_index = oop_recorder()->find_index(obj);
5765   }
5766   RelocationHolder rspec = metadata_Relocation::spec(oop_index);
5767   mov(dst, Address((address)obj, rspec));
5768 }
5769 
5770 Address MacroAssembler::constant_oop_address(jobject obj) {
5771 #ifdef ASSERT
5772   {
5773     ThreadInVMfromUnknown tiv;
5774     assert(oop_recorder() != nullptr, "this assembler needs an OopRecorder");
5775     assert(Universe::heap()->is_in(JNIHandles::resolve(obj)), "not an oop");
5776   }
5777 #endif
5778   int oop_index = oop_recorder()->find_index(obj);
5779   return Address((address)obj, oop_Relocation::spec(oop_index));
5780 }
5781 
5782 // Object / value buffer allocation...
5783 void MacroAssembler::allocate_instance(Register klass, Register new_obj,
5784                                        Register t1, Register t2,
5785                                        bool clear_fields, Label& alloc_failed)
5786 {
5787   Label done, initialize_header, initialize_object, slow_case, slow_case_no_pop;
5788   Register layout_size = t1;
5789   assert(new_obj == r0, "needs to be r0");
5790   assert_different_registers(klass, new_obj, t1, t2);
5791 
5792   // get instance_size in InstanceKlass (scaled to a count of bytes)
5793   ldrw(layout_size, Address(klass, Klass::layout_helper_offset()));
5794   // test to see if it is malformed in some way
5795   tst(layout_size, Klass::_lh_instance_slow_path_bit);
5796   br(Assembler::NE, slow_case_no_pop);
5797 
5798   // Allocate the instance:
5799   //  If TLAB is enabled:
5800   //    Try to allocate in the TLAB.
5801   //    If fails, go to the slow path.
5802   //    Initialize the allocation.
5803   //    Exit.
5804   //
5805   //  Go to slow path.
5806 
5807   if (UseTLAB) {
5808     push(klass);
5809     tlab_allocate(new_obj, layout_size, 0, klass, t2, slow_case);
5810     if (ZeroTLAB || (!clear_fields)) {
5811       // the fields have been already cleared
5812       b(initialize_header);
5813     } else {
5814       // initialize both the header and fields
5815       b(initialize_object);
5816     }
5817 
5818     if (clear_fields) {
5819       // The object is initialized before the header.  If the object size is
5820       // zero, go directly to the header initialization.
5821       bind(initialize_object);
5822       int header_size = oopDesc::header_size() * HeapWordSize;
5823       assert(is_aligned(header_size, BytesPerLong), "oop header size must be 8-byte-aligned");
5824       subs(layout_size, layout_size, header_size);
5825       br(Assembler::EQ, initialize_header);
5826 
5827       // Initialize topmost object field, divide size by 8, check if odd and
5828       // test if zero.
5829 
5830   #ifdef ASSERT
5831       // make sure instance_size was multiple of 8
5832       Label L;
5833       tst(layout_size, 7);
5834       br(Assembler::EQ, L);
5835       stop("object size is not multiple of 8 - adjust this code");
5836       bind(L);
5837       // must be > 0, no extra check needed here
5838   #endif
5839 
5840       lsr(layout_size, layout_size, LogBytesPerLong);
5841 
5842       // initialize remaining object fields: instance_size was a multiple of 8
5843       {
5844         Label loop;
5845         Register base = t2;
5846 
5847         bind(loop);
5848         add(rscratch1, new_obj, layout_size, Assembler::LSL, LogBytesPerLong);
5849         str(zr, Address(rscratch1, header_size - 1*oopSize));
5850         subs(layout_size, layout_size, 1);
5851         br(Assembler::NE, loop);
5852       }
5853     } // clear_fields
5854 
5855     // initialize object header only.
5856     bind(initialize_header);
5857     pop(klass);
5858     Register mark_word = t2;
5859     if (UseCompactObjectHeaders || EnableValhalla) {
5860       ldr(mark_word, Address(klass, Klass::prototype_header_offset()));
5861       str(mark_word, Address(new_obj, oopDesc::mark_offset_in_bytes()));
5862     } else {
5863       mov(mark_word, (intptr_t)markWord::prototype().value());
5864       str(mark_word, Address(new_obj, oopDesc::mark_offset_in_bytes()));
5865     }
5866     if (!UseCompactObjectHeaders) {
5867       store_klass_gap(new_obj, zr);  // zero klass gap for compressed oops
5868       mov(t2, klass);                // preserve klass
5869       store_klass(new_obj, t2);      // src klass reg is potentially compressed
5870     }
5871     b(done);
5872   }
5873 
5874   if (UseTLAB) {
5875     bind(slow_case);
5876     pop(klass);
5877   }
5878   bind(slow_case_no_pop);
5879   b(alloc_failed);
5880 
5881   bind(done);
5882 }
5883 
5884 // Defines obj, preserves var_size_in_bytes, okay for t2 == var_size_in_bytes.
5885 void MacroAssembler::tlab_allocate(Register obj,
5886                                    Register var_size_in_bytes,
5887                                    int con_size_in_bytes,
5888                                    Register t1,
5889                                    Register t2,
5890                                    Label& slow_case) {
5891   BarrierSetAssembler *bs = BarrierSet::barrier_set()->barrier_set_assembler();
5892   bs->tlab_allocate(this, obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
5893 }
5894 
5895 void MacroAssembler::inc_held_monitor_count(Register tmp) {
5896   Address dst(rthread, JavaThread::held_monitor_count_offset());
5897 #ifdef ASSERT
5898   ldr(tmp, dst);
5899   increment(tmp);
5900   str(tmp, dst);
5901   Label ok;
5902   tbz(tmp, 63, ok);
5903   STOP("assert(held monitor count underflow)");

5935     ldr(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_start_offset())));
5936     cmp(rscratch2, rscratch1);
5937     br(Assembler::HS, next);
5938     STOP("assert(top >= start)");
5939     should_not_reach_here();
5940 
5941     bind(next);
5942     ldr(rscratch2, Address(rthread, in_bytes(JavaThread::tlab_end_offset())));
5943     ldr(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_top_offset())));
5944     cmp(rscratch2, rscratch1);
5945     br(Assembler::HS, ok);
5946     STOP("assert(top <= end)");
5947     should_not_reach_here();
5948 
5949     bind(ok);
5950     ldp(rscratch2, rscratch1, Address(post(sp, 16)));
5951   }
5952 #endif
5953 }
5954 
5955 void MacroAssembler::get_inline_type_field_klass(Register holder_klass, Register index, Register inline_klass) {
5956   inline_layout_info(holder_klass, index, inline_klass);
5957   ldr(inline_klass, Address(inline_klass, InlineLayoutInfo::klass_offset()));
5958 }
5959 
5960 void MacroAssembler::inline_layout_info(Register holder_klass, Register index, Register layout_info) {
5961   assert_different_registers(holder_klass, index, layout_info);
5962   InlineLayoutInfo array[2];
5963   int size = (char*)&array[1] - (char*)&array[0]; // computing size of array elements
5964   if (is_power_of_2(size)) {
5965     lsl(index, index, log2i_exact(size)); // Scale index by power of 2
5966   } else {
5967     mov(layout_info, size);
5968     mul(index, index, layout_info); // Scale the index to be the entry index * array_element_size
5969   }
5970   ldr(layout_info, Address(holder_klass, InstanceKlass::inline_layout_info_array_offset()));
5971   add(layout_info, layout_info, Array<InlineLayoutInfo>::base_offset_in_bytes());
5972   lea(layout_info, Address(layout_info, index));
5973 }
5974 
5975 // Writes to stack successive pages until offset reached to check for
5976 // stack overflow + shadow pages.  This clobbers tmp.
5977 void MacroAssembler::bang_stack_size(Register size, Register tmp) {
5978   assert_different_registers(tmp, size, rscratch1);
5979   mov(tmp, sp);
5980   // Bang stack for total size given plus shadow page size.
5981   // Bang one page at a time because large size can bang beyond yellow and
5982   // red zones.
5983   Label loop;
5984   mov(rscratch1, (int)os::vm_page_size());
5985   bind(loop);
5986   lea(tmp, Address(tmp, -(int)os::vm_page_size()));
5987   subsw(size, size, rscratch1);
5988   str(size, Address(tmp));
5989   br(Assembler::GT, loop);
5990 
5991   // Bang down shadow pages too.
5992   // At this point, (tmp-0) is the last address touched, so don't
5993   // touch it again.  (It was touched as (tmp-pagesize) but then tmp
5994   // was post-decremented.)  Skip this address by starting at i=1, and

6080 }
6081 
6082 void MacroAssembler::remove_frame(int framesize) {
6083   assert(framesize >= 2 * wordSize, "framesize must include space for FP/LR");
6084   assert(framesize % (2*wordSize) == 0, "must preserve 2*wordSize alignment");
6085   if (framesize < ((1 << 9) + 2 * wordSize)) {
6086     ldp(rfp, lr, Address(sp, framesize - 2 * wordSize));
6087     add(sp, sp, framesize);
6088   } else {
6089     if (framesize < ((1 << 12) + 2 * wordSize))
6090       add(sp, sp, framesize - 2 * wordSize);
6091     else {
6092       mov(rscratch1, framesize - 2 * wordSize);
6093       add(sp, sp, rscratch1);
6094     }
6095     ldp(rfp, lr, Address(post(sp, 2 * wordSize)));
6096   }
6097   authenticate_return_address();
6098 }
6099 
6100 void MacroAssembler::remove_frame(int initial_framesize, bool needs_stack_repair) {
6101   if (needs_stack_repair) {
6102     // Remove the extension of the caller's frame used for inline type unpacking
6103     //
6104     // Right now the stack looks like this:
6105     //
6106     // | Arguments from caller     |
6107     // |---------------------------|  <-- caller's SP
6108     // | Saved LR #1               |
6109     // | Saved FP #1               |
6110     // |---------------------------|
6111     // | Extension space for       |
6112     // |   inline arg (un)packing  |
6113     // |---------------------------|  <-- start of this method's frame
6114     // | Saved LR #2               |
6115     // | Saved FP #2               |
6116     // |---------------------------|  <-- FP
6117     // | sp_inc                    |
6118     // | method locals             |
6119     // |---------------------------|  <-- SP
6120     //
6121     // There are two copies of FP and LR on the stack. They will be identical at
6122     // first, but that can change.
6123     // If the caller has been deoptimized, LR #1 will be patched to point at the
6124     // deopt blob, and LR #2 will still point into the old method.
6125     // If the saved FP (x29) was not used as the frame pointer, but to store an
6126     // oop, the GC will be aware only of FP #2 as the spilled location of x29 and
6127     // will fix only this one.
6128     //
6129     // When restoring, one must then load FP #2 into x29, and LR #1 into x30,
6130     // while keeping in mind that from the scalarized entry point, there will be
6131     // only one copy of each.
6132     //
6133     // The sp_inc stack slot holds the total size of the frame including the
6134     // extension space minus two words for the saved FP and LR. That is how to
6135     // find LR #1. FP #2 is always located just after sp_inc.
6136 
6137     int sp_inc_offset = initial_framesize - 3 * wordSize;  // Immediately below saved LR and FP
6138 
6139     ldr(rscratch1, Address(sp, sp_inc_offset));
6140     ldr(rfp, Address(sp, sp_inc_offset + wordSize));
6141     add(sp, sp, rscratch1);
6142     ldr(lr, Address(sp, wordSize));
6143     add(sp, sp, 2 * wordSize);
6144   } else {
6145     remove_frame(initial_framesize);
6146   }
6147 }
6148 
6149 void MacroAssembler::save_stack_increment(int sp_inc, int frame_size) {
6150   int real_frame_size = frame_size + sp_inc;
6151   assert(sp_inc == 0 || sp_inc > 2*wordSize, "invalid sp_inc value");
6152   assert(real_frame_size >= 2*wordSize, "frame size must include FP/LR space");
6153   assert((real_frame_size & (StackAlignmentInBytes-1)) == 0, "frame size not aligned");
6154 
6155   int sp_inc_offset = frame_size - 3 * wordSize;  // Immediately below saved LR and FP
6156 
6157   // Subtract two words for the saved FP and LR as these will be popped
6158   // separately. See remove_frame above.
6159   mov(rscratch1, real_frame_size - 2*wordSize);
6160   str(rscratch1, Address(sp, sp_inc_offset));
6161 }
6162 
6163 // This method counts leading positive bytes (highest bit not set) in provided byte array
6164 address MacroAssembler::count_positives(Register ary1, Register len, Register result) {
6165     // Simple and most common case of aligned small array which is not at the
6166     // end of memory page is placed here. All other cases are in stub.
6167     Label LOOP, END, STUB, STUB_LONG, SET_RESULT, DONE;
6168     const uint64_t UPPER_BIT_MASK=0x8080808080808080;
6169     assert_different_registers(ary1, len, result);
6170 
6171     mov(result, len);
6172     cmpw(len, 0);
6173     br(LE, DONE);
6174     cmpw(len, 4 * wordSize);
6175     br(GE, STUB_LONG); // size > 32 then go to stub
6176 
6177     int shift = 64 - exact_log2(os::vm_page_size());
6178     lsl(rscratch1, ary1, shift);
6179     mov(rscratch2, (size_t)(4 * wordSize) << shift);
6180     adds(rscratch2, rscratch1, rscratch2);  // At end of page?
6181     br(CS, STUB); // at the end of page then go to stub

7059 // On other systems, the helper is a usual C function.
7060 //
7061 void MacroAssembler::get_thread(Register dst) {
7062   RegSet saved_regs =
7063     LINUX_ONLY(RegSet::range(r0, r1)  + lr - dst)
7064     NOT_LINUX (RegSet::range(r0, r17) + lr - dst);
7065 
7066   protect_return_address();
7067   push(saved_regs, sp);
7068 
7069   mov(lr, ExternalAddress(CAST_FROM_FN_PTR(address, JavaThread::aarch64_get_thread_helper)));
7070   blr(lr);
7071   if (dst != c_rarg0) {
7072     mov(dst, c_rarg0);
7073   }
7074 
7075   pop(saved_regs, sp);
7076   authenticate_return_address();
7077 }
7078 
7079 #ifdef COMPILER2
7080 // C2 compiled method's prolog code
7081 // Moved here from aarch64.ad to support Valhalla code belows
7082 void MacroAssembler::verified_entry(Compile* C, int sp_inc) {
7083   if (C->clinit_barrier_on_entry()) {
7084     assert(!C->method()->holder()->is_not_initialized(), "initialization should have been started");
7085 
7086     Label L_skip_barrier;
7087 
7088     mov_metadata(rscratch2, C->method()->holder()->constant_encoding());
7089     clinit_barrier(rscratch2, rscratch1, &L_skip_barrier);
7090     far_jump(RuntimeAddress(SharedRuntime::get_handle_wrong_method_stub()));
7091     bind(L_skip_barrier);
7092   }
7093 
7094   if (C->max_vector_size() > 0) {
7095     reinitialize_ptrue();
7096   }
7097 
7098   int bangsize = C->output()->bang_size_in_bytes();
7099   if (C->output()->need_stack_bang(bangsize))
7100     generate_stack_overflow_check(bangsize);
7101 
7102   // n.b. frame size includes space for return pc and rfp
7103   const long framesize = C->output()->frame_size_in_bytes();
7104   build_frame(framesize);
7105 
7106   if (C->needs_stack_repair()) {
7107     save_stack_increment(sp_inc, framesize);
7108   }
7109 
7110   if (VerifyStackAtCalls) {
7111     Unimplemented();
7112   }
7113 }
7114 #endif // COMPILER2
7115 
7116 int MacroAssembler::store_inline_type_fields_to_buf(ciInlineKlass* vk, bool from_interpreter) {
7117   assert(InlineTypeReturnedAsFields, "Inline types should never be returned as fields");
7118   // An inline type might be returned. If fields are in registers we
7119   // need to allocate an inline type instance and initialize it with
7120   // the value of the fields.
7121   Label skip;
7122   // We only need a new buffered inline type if a new one is not returned
7123   tbz(r0, 0, skip);
7124   int call_offset = -1;
7125 
7126   // Be careful not to clobber r1-7 which hold returned fields
7127   // Also do not use callee-saved registers as these may be live in the interpreter
7128   Register tmp1 = r13, tmp2 = r14, klass = r15, r0_preserved = r12;
7129 
7130   // The following code is similar to allocate_instance but has some slight differences,
7131   // e.g. object size is always not zero, sometimes it's constant; storing klass ptr after
7132   // allocating is not necessary if vk != nullptr, etc. allocate_instance is not aware of these.
7133   Label slow_case;
7134   // 1. Try to allocate a new buffered inline instance either from TLAB or eden space
7135   mov(r0_preserved, r0); // save r0 for slow_case since *_allocate may corrupt it when allocation failed
7136 
7137   if (vk != nullptr) {
7138     // Called from C1, where the return type is statically known.
7139     movptr(klass, (intptr_t)vk->get_InlineKlass());
7140     jint lh = vk->layout_helper();
7141     assert(lh != Klass::_lh_neutral_value, "inline class in return type must have been resolved");
7142     if (UseTLAB && !Klass::layout_helper_needs_slow_path(lh)) {
7143       tlab_allocate(r0, noreg, lh, tmp1, tmp2, slow_case);
7144     } else {
7145       b(slow_case);
7146     }
7147   } else {
7148     // Call from interpreter. R0 contains ((the InlineKlass* of the return type) | 0x01)
7149     andr(klass, r0, -2);
7150     if (UseTLAB) {
7151       ldrw(tmp2, Address(klass, Klass::layout_helper_offset()));
7152       tst(tmp2, Klass::_lh_instance_slow_path_bit);
7153       br(Assembler::NE, slow_case);
7154       tlab_allocate(r0, tmp2, 0, tmp1, tmp2, slow_case);
7155     } else {
7156       b(slow_case);
7157     }
7158   }
7159   if (UseTLAB) {
7160     // 2. Initialize buffered inline instance header
7161     Register buffer_obj = r0;
7162     if (UseCompactObjectHeaders) {
7163       ldr(rscratch1, Address(klass, Klass::prototype_header_offset()));
7164       str(rscratch1, Address(buffer_obj, oopDesc::mark_offset_in_bytes()));
7165     } else {
7166       mov(rscratch1, (intptr_t)markWord::inline_type_prototype().value());
7167       str(rscratch1, Address(buffer_obj, oopDesc::mark_offset_in_bytes()));
7168       store_klass_gap(buffer_obj, zr);
7169       if (vk == nullptr) {
7170         // store_klass corrupts klass, so save it for later use (interpreter case only).
7171         mov(tmp1, klass);
7172       }
7173       store_klass(buffer_obj, klass);
7174       klass = tmp1;
7175     }
7176     // 3. Initialize its fields with an inline class specific handler
7177     if (vk != nullptr) {
7178       far_call(RuntimeAddress(vk->pack_handler())); // no need for call info as this will not safepoint.
7179     } else {
7180       ldr(tmp1, Address(klass, InstanceKlass::adr_inlineklass_fixed_block_offset()));
7181       ldr(tmp1, Address(tmp1, InlineKlass::pack_handler_offset()));
7182       blr(tmp1);
7183     }
7184 
7185     membar(Assembler::StoreStore);
7186     b(skip);
7187   } else {
7188     // Must have already branched to slow_case above.
7189     DEBUG_ONLY(should_not_reach_here());
7190   }
7191   bind(slow_case);
7192   // We failed to allocate a new inline type, fall back to a runtime
7193   // call. Some oop field may be live in some registers but we can't
7194   // tell. That runtime call will take care of preserving them
7195   // across a GC if there's one.
7196   mov(r0, r0_preserved);
7197 
7198   if (from_interpreter) {
7199     super_call_VM_leaf(StubRoutines::store_inline_type_fields_to_buf());
7200   } else {
7201     far_call(RuntimeAddress(StubRoutines::store_inline_type_fields_to_buf()));
7202     call_offset = offset();
7203   }
7204   membar(Assembler::StoreStore);
7205 
7206   bind(skip);
7207   return call_offset;
7208 }
7209 
7210 // Move a value between registers/stack slots and update the reg_state
7211 bool MacroAssembler::move_helper(VMReg from, VMReg to, BasicType bt, RegState reg_state[]) {
7212   assert(from->is_valid() && to->is_valid(), "source and destination must be valid");
7213   if (reg_state[to->value()] == reg_written) {
7214     return true; // Already written
7215   }
7216 
7217   if (from != to && bt != T_VOID) {
7218     if (reg_state[to->value()] == reg_readonly) {
7219       return false; // Not yet writable
7220     }
7221     if (from->is_reg()) {
7222       if (to->is_reg()) {
7223         if (from->is_Register() && to->is_Register()) {
7224           mov(to->as_Register(), from->as_Register());
7225         } else if (from->is_FloatRegister() && to->is_FloatRegister()) {
7226           fmovd(to->as_FloatRegister(), from->as_FloatRegister());
7227         } else {
7228           ShouldNotReachHere();
7229         }
7230       } else {
7231         int st_off = to->reg2stack() * VMRegImpl::stack_slot_size;
7232         Address to_addr = Address(sp, st_off);
7233         if (from->is_FloatRegister()) {
7234           if (bt == T_DOUBLE) {
7235              strd(from->as_FloatRegister(), to_addr);
7236           } else {
7237              assert(bt == T_FLOAT, "must be float");
7238              strs(from->as_FloatRegister(), to_addr);
7239           }
7240         } else {
7241           str(from->as_Register(), to_addr);
7242         }
7243       }
7244     } else {
7245       Address from_addr = Address(sp, from->reg2stack() * VMRegImpl::stack_slot_size);
7246       if (to->is_reg()) {
7247         if (to->is_FloatRegister()) {
7248           if (bt == T_DOUBLE) {
7249             ldrd(to->as_FloatRegister(), from_addr);
7250           } else {
7251             assert(bt == T_FLOAT, "must be float");
7252             ldrs(to->as_FloatRegister(), from_addr);
7253           }
7254         } else {
7255           ldr(to->as_Register(), from_addr);
7256         }
7257       } else {
7258         int st_off = to->reg2stack() * VMRegImpl::stack_slot_size;
7259         ldr(rscratch1, from_addr);
7260         str(rscratch1, Address(sp, st_off));
7261       }
7262     }
7263   }
7264 
7265   // Update register states
7266   reg_state[from->value()] = reg_writable;
7267   reg_state[to->value()] = reg_written;
7268   return true;
7269 }
7270 
7271 // Calculate the extra stack space required for packing or unpacking inline
7272 // args and adjust the stack pointer
7273 int MacroAssembler::extend_stack_for_inline_args(int args_on_stack) {
7274   int sp_inc = args_on_stack * VMRegImpl::stack_slot_size;
7275   sp_inc = align_up(sp_inc, StackAlignmentInBytes);
7276   assert(sp_inc > 0, "sanity");
7277 
7278   // Save a copy of the FP and LR here for deoptimization patching and frame walking
7279   stp(rfp, lr, Address(pre(sp, -2 * wordSize)));
7280 
7281   // Adjust the stack pointer. This will be repaired on return by MacroAssembler::remove_frame
7282   if (sp_inc < (1 << 9)) {
7283     sub(sp, sp, sp_inc);   // Fits in an immediate
7284   } else {
7285     mov(rscratch1, sp_inc);
7286     sub(sp, sp, rscratch1);
7287   }
7288 
7289   return sp_inc + 2 * wordSize;  // Account for the FP/LR space
7290 }
7291 
7292 // Read all fields from an inline type oop and store the values in registers/stack slots
7293 bool MacroAssembler::unpack_inline_helper(const GrowableArray<SigEntry>* sig, int& sig_index,
7294                                           VMReg from, int& from_index, VMRegPair* to, int to_count, int& to_index,
7295                                           RegState reg_state[]) {
7296   assert(sig->at(sig_index)._bt == T_VOID, "should be at end delimiter");
7297   assert(from->is_valid(), "source must be valid");
7298   bool progress = false;
7299 #ifdef ASSERT
7300   const int start_offset = offset();
7301 #endif
7302 
7303   Label L_null, L_notNull;
7304   // Don't use r14 as tmp because it's used for spilling (see MacroAssembler::spill_reg_for)
7305   // TODO 8366717 We need to make sure that r14 (and potentially other long-life regs) are kept live in slowpath runtime calls in GC barriers
7306   Register tmp1 = r10;
7307   Register tmp2 = r11;
7308   Register fromReg = noreg;
7309   ScalarizedInlineArgsStream stream(sig, sig_index, to, to_count, to_index, -1);
7310   bool done = true;
7311   bool mark_done = true;
7312   VMReg toReg;
7313   BasicType bt;
7314   // Check if argument requires a null check
7315   bool null_check = false;
7316   VMReg nullCheckReg;
7317   while (stream.next(nullCheckReg, bt)) {
7318     if (sig->at(stream.sig_index())._offset == -1) {
7319       null_check = true;
7320       break;
7321     }
7322   }
7323   stream.reset(sig_index, to_index);
7324   while (stream.next(toReg, bt)) {
7325     assert(toReg->is_valid(), "destination must be valid");
7326     int idx = (int)toReg->value();
7327     if (reg_state[idx] == reg_readonly) {
7328       if (idx != from->value()) {
7329         mark_done = false;
7330       }
7331       done = false;
7332       continue;
7333     } else if (reg_state[idx] == reg_written) {
7334       continue;
7335     }
7336     assert(reg_state[idx] == reg_writable, "must be writable");
7337     reg_state[idx] = reg_written;
7338     progress = true;
7339 
7340     if (fromReg == noreg) {
7341       if (from->is_reg()) {
7342         fromReg = from->as_Register();
7343       } else {
7344         int st_off = from->reg2stack() * VMRegImpl::stack_slot_size;
7345         ldr(tmp1, Address(sp, st_off));
7346         fromReg = tmp1;
7347       }
7348       if (null_check) {
7349         // Nullable inline type argument, emit null check
7350         cbz(fromReg, L_null);
7351       }
7352     }
7353     int off = sig->at(stream.sig_index())._offset;
7354     if (off == -1) {
7355       assert(null_check, "Missing null check at");
7356       if (toReg->is_stack()) {
7357         int st_off = toReg->reg2stack() * VMRegImpl::stack_slot_size;
7358         mov(tmp2, 1);
7359         str(tmp2, Address(sp, st_off));
7360       } else {
7361         mov(toReg->as_Register(), 1);
7362       }
7363       continue;
7364     }
7365     assert(off > 0, "offset in object should be positive");
7366     Address fromAddr = Address(fromReg, off);
7367     if (!toReg->is_FloatRegister()) {
7368       Register dst = toReg->is_stack() ? tmp2 : toReg->as_Register();
7369       if (is_reference_type(bt)) {
7370         load_heap_oop(dst, fromAddr, rscratch1, rscratch2);
7371       } else {
7372         bool is_signed = (bt != T_CHAR) && (bt != T_BOOLEAN);
7373         load_sized_value(dst, fromAddr, type2aelembytes(bt), is_signed);
7374       }
7375       if (toReg->is_stack()) {
7376         int st_off = toReg->reg2stack() * VMRegImpl::stack_slot_size;
7377         str(dst, Address(sp, st_off));
7378       }
7379     } else if (bt == T_DOUBLE) {
7380       ldrd(toReg->as_FloatRegister(), fromAddr);
7381     } else {
7382       assert(bt == T_FLOAT, "must be float");
7383       ldrs(toReg->as_FloatRegister(), fromAddr);
7384     }
7385   }
7386   if (progress && null_check) {
7387     if (done) {
7388       b(L_notNull);
7389       bind(L_null);
7390       // Set null marker to zero to signal that the argument is null.
7391       // Also set all oop fields to zero to make the GC happy.
7392       stream.reset(sig_index, to_index);
7393       while (stream.next(toReg, bt)) {
7394         if (sig->at(stream.sig_index())._offset == -1 ||
7395             bt == T_OBJECT || bt == T_ARRAY) {
7396           if (toReg->is_stack()) {
7397             int st_off = toReg->reg2stack() * VMRegImpl::stack_slot_size;
7398             str(zr, Address(sp, st_off));
7399           } else {
7400             mov(toReg->as_Register(), zr);
7401           }
7402         }
7403       }
7404       bind(L_notNull);
7405     } else {
7406       bind(L_null);
7407     }
7408   }
7409 
7410   // TODO 8366717 This is probably okay but looks fishy because stream is reset in the "Set null marker to zero" case just above. Same on x64.
7411   sig_index = stream.sig_index();
7412   to_index = stream.regs_index();
7413 
7414   if (mark_done && reg_state[from->value()] != reg_written) {
7415     // This is okay because no one else will write to that slot
7416     reg_state[from->value()] = reg_writable;
7417   }
7418   from_index--;
7419   assert(progress || (start_offset == offset()), "should not emit code");
7420   return done;
7421 }
7422 
7423 // Pack fields back into an inline type oop
7424 bool MacroAssembler::pack_inline_helper(const GrowableArray<SigEntry>* sig, int& sig_index, int vtarg_index,
7425                                         VMRegPair* from, int from_count, int& from_index, VMReg to,
7426                                         RegState reg_state[], Register val_array) {
7427   assert(sig->at(sig_index)._bt == T_METADATA, "should be at delimiter");
7428   assert(to->is_valid(), "destination must be valid");
7429 
7430   if (reg_state[to->value()] == reg_written) {
7431     skip_unpacked_fields(sig, sig_index, from, from_count, from_index);
7432     return true; // Already written
7433   }
7434 
7435   // The GC barrier expanded by store_heap_oop below may call into the
7436   // runtime so use callee-saved registers for any values that need to be
7437   // preserved. The GC barrier assembler should take care of saving the
7438   // Java argument registers.
7439   // TODO 8284443 Isn't it an issue if below code uses r14 as tmp when it contains a spilled value?
7440   // Be careful with r14 because it's used for spilling (see MacroAssembler::spill_reg_for).
7441   Register val_obj_tmp = r21;
7442   Register from_reg_tmp = r22;
7443   Register tmp1 = r14;
7444   Register tmp2 = r13;
7445   Register tmp3 = r12;
7446   Register val_obj = to->is_stack() ? val_obj_tmp : to->as_Register();
7447 
7448   assert_different_registers(val_obj_tmp, from_reg_tmp, tmp1, tmp2, tmp3, val_array);
7449 
7450   if (reg_state[to->value()] == reg_readonly) {
7451     if (!is_reg_in_unpacked_fields(sig, sig_index, to, from, from_count, from_index)) {
7452       skip_unpacked_fields(sig, sig_index, from, from_count, from_index);
7453       return false; // Not yet writable
7454     }
7455     val_obj = val_obj_tmp;
7456   }
7457 
7458   int index = arrayOopDesc::base_offset_in_bytes(T_OBJECT) + vtarg_index * type2aelembytes(T_OBJECT);
7459   load_heap_oop(val_obj, Address(val_array, index), tmp1, tmp2);
7460 
7461   ScalarizedInlineArgsStream stream(sig, sig_index, from, from_count, from_index);
7462   VMReg fromReg;
7463   BasicType bt;
7464   Label L_null;
7465   while (stream.next(fromReg, bt)) {
7466     assert(fromReg->is_valid(), "source must be valid");
7467     reg_state[fromReg->value()] = reg_writable;
7468 
7469     int off = sig->at(stream.sig_index())._offset;
7470     if (off == -1) {
7471       // Nullable inline type argument, emit null check
7472       Label L_notNull;
7473       if (fromReg->is_stack()) {
7474         int ld_off = fromReg->reg2stack() * VMRegImpl::stack_slot_size;
7475         ldrb(tmp2, Address(sp, ld_off));
7476         cbnz(tmp2, L_notNull);
7477       } else {
7478         cbnz(fromReg->as_Register(), L_notNull);
7479       }
7480       mov(val_obj, 0);
7481       b(L_null);
7482       bind(L_notNull);
7483       continue;
7484     }
7485 
7486     assert(off > 0, "offset in object should be positive");
7487     size_t size_in_bytes = is_java_primitive(bt) ? type2aelembytes(bt) : wordSize;
7488 
7489     // Pack the scalarized field into the value object.
7490     Address dst(val_obj, off);
7491     if (!fromReg->is_FloatRegister()) {
7492       Register src;
7493       if (fromReg->is_stack()) {
7494         src = from_reg_tmp;
7495         int ld_off = fromReg->reg2stack() * VMRegImpl::stack_slot_size;
7496         load_sized_value(src, Address(sp, ld_off), size_in_bytes, /* is_signed */ false);
7497       } else {
7498         src = fromReg->as_Register();
7499       }
7500       assert_different_registers(dst.base(), src, tmp1, tmp2, tmp3, val_array);
7501       if (is_reference_type(bt)) {
7502         store_heap_oop(dst, src, tmp1, tmp2, tmp3, IN_HEAP | ACCESS_WRITE | IS_DEST_UNINITIALIZED);
7503       } else {
7504         store_sized_value(dst, src, size_in_bytes);
7505       }
7506     } else if (bt == T_DOUBLE) {
7507       strd(fromReg->as_FloatRegister(), dst);
7508     } else {
7509       assert(bt == T_FLOAT, "must be float");
7510       strs(fromReg->as_FloatRegister(), dst);
7511     }
7512   }
7513   bind(L_null);
7514   sig_index = stream.sig_index();
7515   from_index = stream.regs_index();
7516 
7517   assert(reg_state[to->value()] == reg_writable, "must have already been read");
7518   bool success = move_helper(val_obj->as_VMReg(), to, T_OBJECT, reg_state);
7519   assert(success, "to register must be writeable");
7520   return true;
7521 }
7522 
7523 VMReg MacroAssembler::spill_reg_for(VMReg reg) {
7524   return (reg->is_FloatRegister()) ? v8->as_VMReg() : r14->as_VMReg();
7525 }
7526 
7527 void MacroAssembler::cache_wb(Address line) {
7528   assert(line.getMode() == Address::base_plus_offset, "mode should be base_plus_offset");
7529   assert(line.index() == noreg, "index should be noreg");
7530   assert(line.offset() == 0, "offset should be 0");
7531   // would like to assert this
7532   // assert(line._ext.shift == 0, "shift should be zero");
7533   if (VM_Version::supports_dcpop()) {
7534     // writeback using clear virtual address to point of persistence
7535     dc(Assembler::CVAP, line.base());
7536   } else {
7537     // no need to generate anything as Unsafe.writebackMemory should
7538     // never invoke this stub
7539   }
7540 }
7541 
7542 void MacroAssembler::cache_wbsync(bool is_pre) {
7543   // we only need a barrier post sync
7544   if (!is_pre) {
7545     membar(Assembler::AnyAny);
7546   }

7917   }
7918 
7919   // Check if the lock-stack is full.
7920   ldrw(top, Address(rthread, JavaThread::lock_stack_top_offset()));
7921   cmpw(top, (unsigned)LockStack::end_offset());
7922   br(Assembler::GE, slow);
7923 
7924   // Check for recursion.
7925   subw(t, top, oopSize);
7926   ldr(t, Address(rthread, t));
7927   cmp(obj, t);
7928   br(Assembler::EQ, push);
7929 
7930   // Check header for monitor (0b10).
7931   tst(mark, markWord::monitor_value);
7932   br(Assembler::NE, slow);
7933 
7934   // Try to lock. Transition lock bits 0b01 => 0b00
7935   assert(oopDesc::mark_offset_in_bytes() == 0, "required to avoid lea");
7936   orr(mark, mark, markWord::unlocked_value);
7937   if (EnableValhalla) {
7938     // Mask inline_type bit such that we go to the slow path if object is an inline type
7939     andr(mark, mark, ~((int) markWord::inline_type_bit_in_place));
7940   }
7941   eor(t, mark, markWord::unlocked_value);
7942   cmpxchg(/*addr*/ obj, /*expected*/ mark, /*new*/ t, Assembler::xword,
7943           /*acquire*/ true, /*release*/ false, /*weak*/ false, noreg);
7944   br(Assembler::NE, slow);
7945 
7946   bind(push);
7947   // After successful lock, push object on lock-stack.
7948   str(obj, Address(rthread, top));
7949   addw(top, top, oopSize);
7950   strw(top, Address(rthread, JavaThread::lock_stack_top_offset()));
7951 }
7952 
7953 // Implements lightweight-unlocking.
7954 //
7955 // - obj: the object to be unlocked
7956 // - t1, t2, t3: temporary registers
7957 // - slow: branched to if unlocking fails, absolute offset may larger than 32KB (imm14 encoding).
7958 void MacroAssembler::lightweight_unlock(Register obj, Register t1, Register t2, Register t3, Label& slow) {
7959   // cmpxchg clobbers rscratch1.
7960   assert_different_registers(obj, t1, t2, t3, rscratch1);
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