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src/hotspot/cpu/aarch64/c1_MacroAssembler_aarch64.cpp

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 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 "c1/c1_MacroAssembler.hpp"
 27 #include "c1/c1_Runtime1.hpp"
 28 #include "gc/shared/barrierSetAssembler.hpp"
 29 #include "gc/shared/collectedHeap.hpp"


 30 #include "gc/shared/tlab_globals.hpp"
 31 #include "interpreter/interpreter.hpp"
 32 #include "oops/arrayOop.hpp"
 33 #include "oops/markWord.hpp"
 34 #include "runtime/basicLock.hpp"
 35 #include "runtime/os.hpp"
 36 #include "runtime/sharedRuntime.hpp"
 37 #include "runtime/stubRoutines.hpp"
 38 
 39 void C1_MacroAssembler::float_cmp(bool is_float, int unordered_result,
 40                                   FloatRegister f0, FloatRegister f1,
 41                                   Register result)
 42 {
 43   Label done;
 44   if (is_float) {
 45     fcmps(f0, f1);
 46   } else {
 47     fcmpd(f0, f1);
 48   }
 49   if (unordered_result < 0) {

 70   // save object being locked into the BasicObjectLock
 71   str(obj, Address(disp_hdr, BasicObjectLock::obj_offset()));
 72 
 73   null_check_offset = offset();
 74 
 75   if (DiagnoseSyncOnValueBasedClasses != 0) {
 76     load_klass(hdr, obj);
 77     ldrb(hdr, Address(hdr, Klass::misc_flags_offset()));
 78     tst(hdr, KlassFlags::_misc_is_value_based_class);
 79     br(Assembler::NE, slow_case);
 80   }
 81 
 82   if (LockingMode == LM_LIGHTWEIGHT) {
 83     lightweight_lock(disp_hdr, obj, hdr, temp, rscratch2, slow_case);
 84   } else if (LockingMode == LM_LEGACY) {
 85     Label done;
 86     // Load object header
 87     ldr(hdr, Address(obj, hdr_offset));
 88     // and mark it as unlocked
 89     orr(hdr, hdr, markWord::unlocked_value);






 90     // save unlocked object header into the displaced header location on the stack
 91     str(hdr, Address(disp_hdr, 0));
 92     // test if object header is still the same (i.e. unlocked), and if so, store the
 93     // displaced header address in the object header - if it is not the same, get the
 94     // object header instead
 95     lea(rscratch2, Address(obj, hdr_offset));
 96     cmpxchgptr(hdr, disp_hdr, rscratch2, rscratch1, done, /*fallthough*/nullptr);
 97     // if the object header was the same, we're done
 98     // if the object header was not the same, it is now in the hdr register
 99     // => test if it is a stack pointer into the same stack (recursive locking), i.e.:
100     //
101     // 1) (hdr & aligned_mask) == 0
102     // 2) sp <= hdr
103     // 3) hdr <= sp + page_size
104     //
105     // these 3 tests can be done by evaluating the following expression:
106     //
107     // (hdr - sp) & (aligned_mask - page_size)
108     //
109     // assuming both the stack pointer and page_size have their least

158     }
159     // done
160     bind(done);
161     dec_held_monitor_count(rscratch1);
162   }
163 }
164 
165 
166 // Defines obj, preserves var_size_in_bytes
167 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) {
168   if (UseTLAB) {
169     tlab_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
170   } else {
171     b(slow_case);
172   }
173 }
174 
175 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
176   assert_different_registers(obj, klass, len);
177 
178   if (UseCompactObjectHeaders) {
179     ldr(t1, Address(klass, Klass::prototype_header_offset()));
180     str(t1, Address(obj, oopDesc::mark_offset_in_bytes()));
181   } else {
182     mov(t1, checked_cast<int32_t>(markWord::prototype().value()));
183     str(t1, Address(obj, oopDesc::mark_offset_in_bytes()));



184     if (UseCompressedClassPointers) { // Take care not to kill klass
185       encode_klass_not_null(t1, klass);
186       strw(t1, Address(obj, oopDesc::klass_offset_in_bytes()));
187     } else {
188       str(klass, Address(obj, oopDesc::klass_offset_in_bytes()));
189     }
190   }
191 
192   if (len->is_valid()) {
193     strw(len, Address(obj, arrayOopDesc::length_offset_in_bytes()));
194     int base_offset = arrayOopDesc::length_offset_in_bytes() + BytesPerInt;
195     if (!is_aligned(base_offset, BytesPerWord)) {
196       assert(is_aligned(base_offset, BytesPerInt), "must be 4-byte aligned");
197       // Clear gap/first 4 bytes following the length field.
198       strw(zr, Address(obj, base_offset));
199     }
200   } else if (UseCompressedClassPointers && !UseCompactObjectHeaders) {
201     store_klass_gap(obj, zr);
202   }
203 }

300   // following the length field in initialize_header().
301   int base_offset = align_up(base_offset_in_bytes, BytesPerWord);
302   // clear rest of allocated space
303   if (zero_array) {
304     initialize_body(obj, arr_size, base_offset, t1, t2);
305   }
306   if (Compilation::current()->bailed_out()) {
307     return;
308   }
309 
310   membar(StoreStore);
311 
312   if (CURRENT_ENV->dtrace_alloc_probes()) {
313     assert(obj == r0, "must be");
314     far_call(RuntimeAddress(Runtime1::entry_for(C1StubId::dtrace_object_alloc_id)));
315   }
316 
317   verify_oop(obj);
318 }
319 
320 void C1_MacroAssembler::build_frame(int framesize, int bang_size_in_bytes) {
321   assert(bang_size_in_bytes >= framesize, "stack bang size incorrect");











322   // Make sure there is enough stack space for this method's activation.
323   // Note that we do this before creating a frame.

324   generate_stack_overflow_check(bang_size_in_bytes);
325   MacroAssembler::build_frame(framesize);

326 
327   // Insert nmethod entry barrier into frame.
328   BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
329   bs->nmethod_entry_barrier(this, nullptr /* slow_path */, nullptr /* continuation */, nullptr /* guard */);
330 }
331 
332 void C1_MacroAssembler::remove_frame(int framesize) {
333   MacroAssembler::remove_frame(framesize);


334 }
335 
336 
337 void C1_MacroAssembler::verified_entry(bool breakAtEntry) {
338   // If we have to make this method not-entrant we'll overwrite its
339   // first instruction with a jump.  For this action to be legal we
340   // must ensure that this first instruction is a B, BL, NOP, BKPT,
341   // SVC, HVC, or SMC.  Make it a NOP.
342   nop();






























































343 }
344 

345 void C1_MacroAssembler::load_parameter(int offset_in_words, Register reg) {
346   // rfp, + 0: link
347   //     + 1: return address
348   //     + 2: argument with offset 0
349   //     + 3: argument with offset 1
350   //     + 4: ...
351 
352   ldr(reg, Address(rfp, (offset_in_words + 2) * BytesPerWord));
353 }
354 
355 #ifndef PRODUCT
356 
357 void C1_MacroAssembler::verify_stack_oop(int stack_offset) {
358   if (!VerifyOops) return;
359   verify_oop_addr(Address(sp, stack_offset));
360 }
361 
362 void C1_MacroAssembler::verify_not_null_oop(Register r) {
363   if (!VerifyOops) return;
364   Label not_null;

 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 "c1/c1_MacroAssembler.hpp"
 27 #include "c1/c1_Runtime1.hpp"
 28 #include "gc/shared/barrierSetAssembler.hpp"
 29 #include "gc/shared/collectedHeap.hpp"
 30 #include "gc/shared/barrierSet.hpp"
 31 #include "gc/shared/barrierSetAssembler.hpp"
 32 #include "gc/shared/tlab_globals.hpp"
 33 #include "interpreter/interpreter.hpp"
 34 #include "oops/arrayOop.hpp"
 35 #include "oops/markWord.hpp"
 36 #include "runtime/basicLock.hpp"
 37 #include "runtime/os.hpp"
 38 #include "runtime/sharedRuntime.hpp"
 39 #include "runtime/stubRoutines.hpp"
 40 
 41 void C1_MacroAssembler::float_cmp(bool is_float, int unordered_result,
 42                                   FloatRegister f0, FloatRegister f1,
 43                                   Register result)
 44 {
 45   Label done;
 46   if (is_float) {
 47     fcmps(f0, f1);
 48   } else {
 49     fcmpd(f0, f1);
 50   }
 51   if (unordered_result < 0) {

 72   // save object being locked into the BasicObjectLock
 73   str(obj, Address(disp_hdr, BasicObjectLock::obj_offset()));
 74 
 75   null_check_offset = offset();
 76 
 77   if (DiagnoseSyncOnValueBasedClasses != 0) {
 78     load_klass(hdr, obj);
 79     ldrb(hdr, Address(hdr, Klass::misc_flags_offset()));
 80     tst(hdr, KlassFlags::_misc_is_value_based_class);
 81     br(Assembler::NE, slow_case);
 82   }
 83 
 84   if (LockingMode == LM_LIGHTWEIGHT) {
 85     lightweight_lock(disp_hdr, obj, hdr, temp, rscratch2, slow_case);
 86   } else if (LockingMode == LM_LEGACY) {
 87     Label done;
 88     // Load object header
 89     ldr(hdr, Address(obj, hdr_offset));
 90     // and mark it as unlocked
 91     orr(hdr, hdr, markWord::unlocked_value);
 92 
 93     if (EnableValhalla) {
 94       // Mask always_locked bit such that we go to the slow path if object is an inline type
 95       andr(hdr, hdr, ~markWord::inline_type_bit_in_place);
 96     }
 97 
 98     // save unlocked object header into the displaced header location on the stack
 99     str(hdr, Address(disp_hdr, 0));
100     // test if object header is still the same (i.e. unlocked), and if so, store the
101     // displaced header address in the object header - if it is not the same, get the
102     // object header instead
103     lea(rscratch2, Address(obj, hdr_offset));
104     cmpxchgptr(hdr, disp_hdr, rscratch2, rscratch1, done, /*fallthough*/nullptr);
105     // if the object header was the same, we're done
106     // if the object header was not the same, it is now in the hdr register
107     // => test if it is a stack pointer into the same stack (recursive locking), i.e.:
108     //
109     // 1) (hdr & aligned_mask) == 0
110     // 2) sp <= hdr
111     // 3) hdr <= sp + page_size
112     //
113     // these 3 tests can be done by evaluating the following expression:
114     //
115     // (hdr - sp) & (aligned_mask - page_size)
116     //
117     // assuming both the stack pointer and page_size have their least

166     }
167     // done
168     bind(done);
169     dec_held_monitor_count(rscratch1);
170   }
171 }
172 
173 
174 // Defines obj, preserves var_size_in_bytes
175 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) {
176   if (UseTLAB) {
177     tlab_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
178   } else {
179     b(slow_case);
180   }
181 }
182 
183 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
184   assert_different_registers(obj, klass, len);
185 
186   if (UseCompactObjectHeaders || EnableValhalla) {
187     ldr(t1, Address(klass, Klass::prototype_header_offset()));
188     str(t1, Address(obj, oopDesc::mark_offset_in_bytes()));
189   } else {
190     mov(t1, checked_cast<int32_t>(markWord::prototype().value()));
191     str(t1, Address(obj, oopDesc::mark_offset_in_bytes()));
192   }
193 
194   if (!UseCompactObjectHeaders) {
195     if (UseCompressedClassPointers) { // Take care not to kill klass
196       encode_klass_not_null(t1, klass);
197       strw(t1, Address(obj, oopDesc::klass_offset_in_bytes()));
198     } else {
199       str(klass, Address(obj, oopDesc::klass_offset_in_bytes()));
200     }
201   }
202 
203   if (len->is_valid()) {
204     strw(len, Address(obj, arrayOopDesc::length_offset_in_bytes()));
205     int base_offset = arrayOopDesc::length_offset_in_bytes() + BytesPerInt;
206     if (!is_aligned(base_offset, BytesPerWord)) {
207       assert(is_aligned(base_offset, BytesPerInt), "must be 4-byte aligned");
208       // Clear gap/first 4 bytes following the length field.
209       strw(zr, Address(obj, base_offset));
210     }
211   } else if (UseCompressedClassPointers && !UseCompactObjectHeaders) {
212     store_klass_gap(obj, zr);
213   }
214 }

311   // following the length field in initialize_header().
312   int base_offset = align_up(base_offset_in_bytes, BytesPerWord);
313   // clear rest of allocated space
314   if (zero_array) {
315     initialize_body(obj, arr_size, base_offset, t1, t2);
316   }
317   if (Compilation::current()->bailed_out()) {
318     return;
319   }
320 
321   membar(StoreStore);
322 
323   if (CURRENT_ENV->dtrace_alloc_probes()) {
324     assert(obj == r0, "must be");
325     far_call(RuntimeAddress(Runtime1::entry_for(C1StubId::dtrace_object_alloc_id)));
326   }
327 
328   verify_oop(obj);
329 }
330 
331 void C1_MacroAssembler::build_frame_helper(int frame_size_in_bytes, int sp_offset_for_orig_pc, int sp_inc, bool reset_orig_pc, bool needs_stack_repair) {
332   MacroAssembler::build_frame(frame_size_in_bytes);
333 
334   if (needs_stack_repair) {
335     save_stack_increment(sp_inc, frame_size_in_bytes);
336   }
337   if (reset_orig_pc) {
338     // Zero orig_pc to detect deoptimization during buffering in the entry points
339     str(zr, Address(sp, sp_offset_for_orig_pc));
340   }
341 }
342 
343 void C1_MacroAssembler::build_frame(int frame_size_in_bytes, int bang_size_in_bytes, int sp_offset_for_orig_pc, bool needs_stack_repair, bool has_scalarized_args, Label* verified_inline_entry_label) {
344   // Make sure there is enough stack space for this method's activation.
345   // Note that we do this before creating a frame.
346   assert(bang_size_in_bytes >= frame_size_in_bytes, "stack bang size incorrect");
347   generate_stack_overflow_check(bang_size_in_bytes);
348 
349   build_frame_helper(frame_size_in_bytes, sp_offset_for_orig_pc, 0, has_scalarized_args, needs_stack_repair);
350 
351   // Insert nmethod entry barrier into frame.
352   BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
353   bs->nmethod_entry_barrier(this, nullptr /* slow_path */, nullptr /* continuation */, nullptr /* guard */);

354 
355   if (verified_inline_entry_label != nullptr) {
356     // Jump here from the scalarized entry points that already created the frame.
357     bind(*verified_inline_entry_label);
358   }
359 }
360 

361 void C1_MacroAssembler::verified_entry(bool breakAtEntry) {
362   // If we have to make this method not-entrant we'll overwrite its
363   // first instruction with a jump.  For this action to be legal we
364   // must ensure that this first instruction is a B, BL, NOP, BKPT,
365   // SVC, HVC, or SMC.  Make it a NOP.
366   nop();
367   if (C1Breakpoint) brk(1);
368 }
369 
370 int C1_MacroAssembler::scalarized_entry(const CompiledEntrySignature* ces, int frame_size_in_bytes, int bang_size_in_bytes, int sp_offset_for_orig_pc, Label& verified_inline_entry_label, bool is_inline_ro_entry) {
371   assert(InlineTypePassFieldsAsArgs, "sanity");
372   // Make sure there is enough stack space for this method's activation.
373   assert(bang_size_in_bytes >= frame_size_in_bytes, "stack bang size incorrect");
374   generate_stack_overflow_check(bang_size_in_bytes);
375 
376   GrowableArray<SigEntry>* sig    = ces->sig();
377   GrowableArray<SigEntry>* sig_cc = is_inline_ro_entry ? ces->sig_cc_ro() : ces->sig_cc();
378   VMRegPair* regs      = ces->regs();
379   VMRegPair* regs_cc   = is_inline_ro_entry ? ces->regs_cc_ro() : ces->regs_cc();
380   int args_on_stack    = ces->args_on_stack();
381   int args_on_stack_cc = is_inline_ro_entry ? ces->args_on_stack_cc_ro() : ces->args_on_stack_cc();
382 
383   assert(sig->length() <= sig_cc->length(), "Zero-sized inline class not allowed!");
384   BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sig_cc->length());
385   int args_passed = sig->length();
386   int args_passed_cc = SigEntry::fill_sig_bt(sig_cc, sig_bt);
387 
388   // Create a temp frame so we can call into the runtime. It must be properly set up to accommodate GC.
389   build_frame_helper(frame_size_in_bytes, sp_offset_for_orig_pc, 0, true, ces->c1_needs_stack_repair());
390 
391   // The runtime call might safepoint, make sure nmethod entry barrier is executed
392   BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
393   // C1 code is not hot enough to micro optimize the nmethod entry barrier with an out-of-line stub
394   bs->nmethod_entry_barrier(this, nullptr /* slow_path */, nullptr /* continuation */, nullptr /* guard */);
395 
396   // FIXME -- call runtime only if we cannot in-line allocate all the incoming inline type args.
397   mov(r19, (intptr_t) ces->method());
398   if (is_inline_ro_entry) {
399     far_call(RuntimeAddress(Runtime1::entry_for(C1StubId::buffer_inline_args_no_receiver_id)));
400   } else {
401     far_call(RuntimeAddress(Runtime1::entry_for(C1StubId::buffer_inline_args_id)));
402   }
403   int rt_call_offset = offset();
404 
405   // The runtime call returns the new array in r20 instead of the usual r0
406   // because r0 is also j_rarg7 which may be holding a live argument here.
407   Register val_array = r20;
408 
409   // Remove the temp frame
410   MacroAssembler::remove_frame(frame_size_in_bytes);
411 
412   // Check if we need to extend the stack for packing
413   int sp_inc = 0;
414   if (args_on_stack > args_on_stack_cc) {
415     sp_inc = extend_stack_for_inline_args(args_on_stack);
416   }
417 
418   shuffle_inline_args(true, is_inline_ro_entry, sig_cc,
419                       args_passed_cc, args_on_stack_cc, regs_cc, // from
420                       args_passed, args_on_stack, regs,          // to
421                       sp_inc, val_array);
422 
423   // Create the real frame. Below jump will then skip over the stack banging and frame
424   // setup code in the verified_inline_entry (which has a different real_frame_size).
425   build_frame_helper(frame_size_in_bytes, sp_offset_for_orig_pc, sp_inc, false, ces->c1_needs_stack_repair());
426 
427   b(verified_inline_entry_label);
428   return rt_call_offset;
429 }
430 
431 
432 void C1_MacroAssembler::load_parameter(int offset_in_words, Register reg) {
433   // rfp, + 0: link
434   //     + 1: return address
435   //     + 2: argument with offset 0
436   //     + 3: argument with offset 1
437   //     + 4: ...
438 
439   ldr(reg, Address(rfp, (offset_in_words + 2) * BytesPerWord));
440 }
441 
442 #ifndef PRODUCT
443 
444 void C1_MacroAssembler::verify_stack_oop(int stack_offset) {
445   if (!VerifyOops) return;
446   verify_oop_addr(Address(sp, stack_offset));
447 }
448 
449 void C1_MacroAssembler::verify_not_null_oop(Register r) {
450   if (!VerifyOops) return;
451   Label not_null;
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