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src/hotspot/cpu/aarch64/c1_MacroAssembler_aarch64.cpp

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 44 {
 45   Label done;
 46   if (is_float) {
 47     fcmps(f0, f1);
 48   } else {
 49     fcmpd(f0, f1);
 50   }
 51   if (unordered_result < 0) {
 52     // we want -1 for unordered or less than, 0 for equal and 1 for
 53     // greater than.
 54     cset(result, NE);  // Not equal or unordered
 55     cneg(result, result, LT);  // Less than or unordered
 56   } else {
 57     // we want -1 for less than, 0 for equal and 1 for unordered or
 58     // greater than.
 59     cset(result, NE);  // Not equal or unordered
 60     cneg(result, result, LO);  // Less than
 61   }
 62 }
 63 
 64 int C1_MacroAssembler::lock_object(Register hdr, Register obj, Register disp_hdr, Register scratch, Label& slow_case) {
 65   const int aligned_mask = BytesPerWord -1;
 66   const int hdr_offset = oopDesc::mark_offset_in_bytes();
 67   assert(hdr != obj && hdr != disp_hdr && obj != disp_hdr, "registers must be different");
 68   Label done;
 69   int null_check_offset = -1;
 70 
 71   verify_oop(obj);
 72 
 73   // save object being locked into the BasicObjectLock
 74   str(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()));
 75 
 76   null_check_offset = offset();
 77 
 78   if (DiagnoseSyncOnValueBasedClasses != 0) {
 79     load_klass(hdr, obj);
 80     ldrw(hdr, Address(hdr, Klass::access_flags_offset()));
 81     tstw(hdr, JVM_ACC_IS_VALUE_BASED_CLASS);
 82     br(Assembler::NE, slow_case);
 83   }
 84 
 85   if (UseBiasedLocking) {
 86     assert(scratch != noreg, "should have scratch register at this point");
 87     biased_locking_enter(disp_hdr, obj, hdr, scratch, false, done, &slow_case);
 88   }
 89 
 90   // Load object header
 91   ldr(hdr, Address(obj, hdr_offset));
 92   // and mark it as unlocked
 93   orr(hdr, hdr, markWord::unlocked_value);
 94   // save unlocked object header into the displaced header location on the stack
 95   str(hdr, Address(disp_hdr, 0));
 96   // test if object header is still the same (i.e. unlocked), and if so, store the
 97   // displaced header address in the object header - if it is not the same, get the
 98   // object header instead
 99   lea(rscratch2, Address(obj, hdr_offset));
100   cmpxchgptr(hdr, disp_hdr, rscratch2, rscratch1, done, /*fallthough*/NULL);
101   // if the object header was the same, we're done
102   // if the object header was not the same, it is now in the hdr register
103   // => test if it is a stack pointer into the same stack (recursive locking), i.e.:
104   //
105   // 1) (hdr & aligned_mask) == 0
106   // 2) sp <= hdr
107   // 3) hdr <= sp + page_size
108   //
109   // these 3 tests can be done by evaluating the following expression:
110   //
111   // (hdr - sp) & (aligned_mask - page_size)
112   //
113   // assuming both the stack pointer and page_size have their least
114   // significant 2 bits cleared and page_size is a power of 2
115   mov(rscratch1, sp);
116   sub(hdr, hdr, rscratch1);
117   ands(hdr, hdr, aligned_mask - os::vm_page_size());
118   // for recursive locking, the result is zero => save it in the displaced header
119   // location (NULL in the displaced hdr location indicates recursive locking)
120   str(hdr, Address(disp_hdr, 0));
121   // otherwise we don't care about the result and handle locking via runtime call
122   cbnz(hdr, slow_case);
123   // done
124   bind(done);




125   if (PrintBiasedLockingStatistics) {
126     lea(rscratch2, ExternalAddress((address)BiasedLocking::fast_path_entry_count_addr()));
127     addmw(Address(rscratch2, 0), 1, rscratch1);
128   }
129   return null_check_offset;
130 }
131 
132 
133 void C1_MacroAssembler::unlock_object(Register hdr, Register obj, Register disp_hdr, Label& slow_case) {
134   const int aligned_mask = BytesPerWord -1;
135   const int hdr_offset = oopDesc::mark_offset_in_bytes();
136   assert(hdr != obj && hdr != disp_hdr && obj != disp_hdr, "registers must be different");
137   Label done;
138 
139   if (UseBiasedLocking) {
140     // load object
141     ldr(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()));
142     biased_locking_exit(obj, hdr, done);
143   }
144 
145   // load displaced header
146   ldr(hdr, Address(disp_hdr, 0));
147   // if the loaded hdr is NULL we had recursive locking
148   // if we had recursive locking, we are done
149   cbz(hdr, done);



150   if (!UseBiasedLocking) {
151     // load object
152     ldr(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()));
153   }
154   verify_oop(obj);
155   // test if object header is pointing to the displaced header, and if so, restore
156   // the displaced header in the object - if the object header is not pointing to
157   // the displaced header, get the object header instead
158   // if the object header was not pointing to the displaced header,
159   // we do unlocking via runtime call
160   if (hdr_offset) {
161     lea(rscratch1, Address(obj, hdr_offset));
162     cmpxchgptr(disp_hdr, hdr, rscratch1, rscratch2, done, &slow_case);
163   } else {
164     cmpxchgptr(disp_hdr, hdr, obj, rscratch2, done, &slow_case);












165   }
166   // done
167   bind(done);
168 }
169 
170 
171 // Defines obj, preserves var_size_in_bytes
172 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) {
173   if (UseTLAB) {
174     tlab_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
175   } else {
176     eden_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, slow_case);
177   }
178 }
179 
180 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
181   assert_different_registers(obj, klass, len);
182   if (UseBiasedLocking && !len->is_valid()) {
183     assert_different_registers(obj, klass, len, t1, t2);
184     ldr(t1, Address(klass, Klass::prototype_header_offset()));
185   } else {
186     // This assumes that all prototype bits fit in an int32_t
187     mov(t1, (int32_t)(intptr_t)markWord::prototype().value());
188   }
189   str(t1, Address(obj, oopDesc::mark_offset_in_bytes()));
190 
191   if (UseCompressedClassPointers) { // Take care not to kill klass
192     encode_klass_not_null(t1, klass);
193     strw(t1, Address(obj, oopDesc::klass_offset_in_bytes()));
194   } else {
195     str(klass, Address(obj, oopDesc::klass_offset_in_bytes()));


196   }
197 
198   if (len->is_valid()) {
199     strw(len, Address(obj, arrayOopDesc::length_offset_in_bytes()));
200   } else if (UseCompressedClassPointers) {
201     store_klass_gap(obj, zr);
202   }
203 }
204 
205 // preserves obj, destroys len_in_bytes
206 //
207 // Scratch registers: t1 = r10, t2 = r11
208 //
209 void C1_MacroAssembler::initialize_body(Register obj, Register len_in_bytes, int hdr_size_in_bytes, Register t1, Register t2) {
210   assert(hdr_size_in_bytes >= 0, "header size must be positive or 0");
211   assert(t1 == r10 && t2 == r11, "must be");
212 
213   Label done;
214 
215   // len_in_bytes is positive and ptr sized
216   subs(len_in_bytes, len_in_bytes, hdr_size_in_bytes);
217   br(Assembler::EQ, done);
218 






219   // zero_words() takes ptr in r10 and count in words in r11
220   mov(rscratch1, len_in_bytes);
221   lea(t1, Address(obj, hdr_size_in_bytes));
222   lsr(t2, rscratch1, LogBytesPerWord);
223   zero_words(t1, t2);
224 
225   bind(done);
226 }
227 
228 
229 void C1_MacroAssembler::allocate_object(Register obj, Register t1, Register t2, int header_size, int object_size, Register klass, Label& slow_case) {
230   assert_different_registers(obj, t1, t2); // XXX really?
231   assert(header_size >= 0 && object_size >= header_size, "illegal sizes");
232 
233   try_allocate(obj, noreg, object_size * BytesPerWord, t1, t2, slow_case);
234 
235   initialize_object(obj, klass, noreg, object_size * HeapWordSize, t1, t2, UseTLAB);
236 }
237 
238 // Scratch registers: t1 = r10, t2 = r11

248      const Register index = t2;
249      if (var_size_in_bytes != noreg) {
250        mov(index, var_size_in_bytes);
251        initialize_body(obj, index, hdr_size_in_bytes, t1, t2);
252      } else if (con_size_in_bytes > hdr_size_in_bytes) {
253        con_size_in_bytes -= hdr_size_in_bytes;
254        lea(t1, Address(obj, hdr_size_in_bytes));
255        zero_words(t1, con_size_in_bytes / BytesPerWord);
256      }
257   }
258 
259   membar(StoreStore);
260 
261   if (CURRENT_ENV->dtrace_alloc_probes()) {
262     assert(obj == r0, "must be");
263     far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
264   }
265 
266   verify_oop(obj);
267 }
268 void C1_MacroAssembler::allocate_array(Register obj, Register len, Register t1, Register t2, int header_size, int f, Register klass, Label& slow_case) {
269   assert_different_registers(obj, len, t1, t2, klass);
270 
271   // determine alignment mask
272   assert(!(BytesPerWord & 1), "must be a multiple of 2 for masking code to work");
273 
274   // check for negative or excessive length
275   mov(rscratch1, (int32_t)max_array_allocation_length);
276   cmp(len, rscratch1);
277   br(Assembler::HS, slow_case);
278 
279   const Register arr_size = t2; // okay to be the same
280   // align object end
281   mov(arr_size, (int32_t)header_size * BytesPerWord + MinObjAlignmentInBytesMask);
282   add(arr_size, arr_size, len, ext::uxtw, f);
283   andr(arr_size, arr_size, ~MinObjAlignmentInBytesMask);
284 
285   try_allocate(obj, arr_size, 0, t1, t2, slow_case);
286 
287   initialize_header(obj, klass, len, t1, t2);
288 
289   // clear rest of allocated space
290   initialize_body(obj, arr_size, header_size * BytesPerWord, t1, t2);
291 
292   membar(StoreStore);
293 
294   if (CURRENT_ENV->dtrace_alloc_probes()) {
295     assert(obj == r0, "must be");
296     far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
297   }
298 
299   verify_oop(obj);
300 }
301 
302 
303 void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) {
304   verify_oop(receiver);
305   // explicit NULL check not needed since load from [klass_offset] causes a trap
306   // check against inline cache
307   assert(!MacroAssembler::needs_explicit_null_check(oopDesc::klass_offset_in_bytes()), "must add explicit null check");
308 



309   cmp_klass(receiver, iCache, rscratch1);
310 }
311 
312 
313 void C1_MacroAssembler::build_frame(int framesize, int bang_size_in_bytes) {
314   assert(bang_size_in_bytes >= framesize, "stack bang size incorrect");
315   // Make sure there is enough stack space for this method's activation.
316   // Note that we do this before creating a frame.
317   generate_stack_overflow_check(bang_size_in_bytes);
318   MacroAssembler::build_frame(framesize);
319 
320   // Insert nmethod entry barrier into frame.
321   BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
322   bs->nmethod_entry_barrier(this);
323 }
324 
325 void C1_MacroAssembler::remove_frame(int framesize) {
326   MacroAssembler::remove_frame(framesize);
327 }
328 

 44 {
 45   Label done;
 46   if (is_float) {
 47     fcmps(f0, f1);
 48   } else {
 49     fcmpd(f0, f1);
 50   }
 51   if (unordered_result < 0) {
 52     // we want -1 for unordered or less than, 0 for equal and 1 for
 53     // greater than.
 54     cset(result, NE);  // Not equal or unordered
 55     cneg(result, result, LT);  // Less than or unordered
 56   } else {
 57     // we want -1 for less than, 0 for equal and 1 for unordered or
 58     // greater than.
 59     cset(result, NE);  // Not equal or unordered
 60     cneg(result, result, LO);  // Less than
 61   }
 62 }
 63 
 64 int C1_MacroAssembler::lock_object(Register hdr, Register obj, Register disp_hdr, Register temp, Label& slow_case) {
 65   const int aligned_mask = BytesPerWord -1;
 66   const int hdr_offset = oopDesc::mark_offset_in_bytes();
 67   assert_different_registers(hdr, obj, disp_hdr, temp, rscratch2);
 68   Label done;
 69   int null_check_offset = -1;
 70 
 71   verify_oop(obj);
 72 
 73   // save object being locked into the BasicObjectLock
 74   str(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()));
 75 
 76   null_check_offset = offset();
 77 
 78   if (DiagnoseSyncOnValueBasedClasses != 0) {
 79     load_klass(hdr, obj);
 80     ldrw(hdr, Address(hdr, Klass::access_flags_offset()));
 81     tstw(hdr, JVM_ACC_IS_VALUE_BASED_CLASS);
 82     br(Assembler::NE, slow_case);
 83   }
 84 
 85   if (UseBiasedLocking) {
 86     assert(temp != noreg, "should have temp register at this point");
 87     biased_locking_enter(disp_hdr, obj, hdr, temp, false, done, &slow_case);
 88   }
 89 
 90   // Load object header
 91   ldr(hdr, Address(obj, hdr_offset));
 92   if (LockingMode == LM_LIGHTWEIGHT) {
 93     lightweight_lock(obj, hdr, temp, rscratch2, slow_case);
 94   } else {
 95     // and mark it as unlocked
 96     orr(hdr, hdr, markWord::unlocked_value);
 97     // save unlocked object header into the displaced header location on the stack
 98     str(hdr, Address(disp_hdr, 0));
 99     // test if object header is still the same (i.e. unlocked), and if so, store the
100     // displaced header address in the object header - if it is not the same, get the
101     // object header instead
102     lea(rscratch2, Address(obj, hdr_offset));
103     cmpxchgptr(hdr, disp_hdr, rscratch2, rscratch1, done, /*fallthough*/NULL);
104     // if the object header was the same, we're done
105     // if the object header was not the same, it is now in the hdr register
106     // => test if it is a stack pointer into the same stack (recursive locking), i.e.:
107     //
108     // 1) (hdr & aligned_mask) == 0
109     // 2) sp <= hdr
110     // 3) hdr <= sp + page_size
111     //
112     // these 3 tests can be done by evaluating the following expression:
113     //
114     // (hdr - sp) & (aligned_mask - page_size)
115     //
116     // assuming both the stack pointer and page_size have their least
117     // significant 2 bits cleared and page_size is a power of 2
118     mov(rscratch1, sp);
119     sub(hdr, hdr, rscratch1);
120     ands(hdr, hdr, aligned_mask - os::vm_page_size());
121     // for recursive locking, the result is zero => save it in the displaced header
122     // location (NULL in the displaced hdr location indicates recursive locking)
123     str(hdr, Address(disp_hdr, 0));
124     // otherwise we don't care about the result and handle locking via runtime call
125     cbnz(hdr, slow_case);
126     // done
127     bind(done);
128   }
129   if (PrintBiasedLockingStatistics) {
130     lea(rscratch2, ExternalAddress((address)BiasedLocking::fast_path_entry_count_addr()));
131     addmw(Address(rscratch2, 0), 1, rscratch1);
132   }
133   return null_check_offset;
134 }
135 
136 
137 void C1_MacroAssembler::unlock_object(Register hdr, Register obj, Register disp_hdr, Register temp, Label& slow_case) {
138   const int aligned_mask = BytesPerWord -1;
139   const int hdr_offset = oopDesc::mark_offset_in_bytes();
140   assert_different_registers(hdr, obj, disp_hdr, temp, rscratch2);
141   Label done;
142 
143   if (UseBiasedLocking) {
144     // load object
145     ldr(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()));
146     biased_locking_exit(obj, hdr, done);
147   }
148 
149   if (LockingMode != LM_LIGHTWEIGHT) {
150     // load displaced header
151     ldr(hdr, Address(disp_hdr, 0));
152     // if the loaded hdr is null we had recursive locking
153     // if we had recursive locking, we are done
154     cbz(hdr, done);
155   }
156 
157   if (!UseBiasedLocking) {
158     // load object
159     ldr(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()));
160   }
161   verify_oop(obj);
162 
163   if (LockingMode == LM_LIGHTWEIGHT) {
164     ldr(hdr, Address(obj, oopDesc::mark_offset_in_bytes()));
165     // We cannot use tbnz here, the target might be too far away and cannot
166     // be encoded.
167     tst(hdr, markWord::monitor_value);
168     br(Assembler::NE, slow_case);
169     lightweight_unlock(obj, hdr, temp, rscratch2, slow_case);
170   } else {
171     // test if object header is pointing to the displaced header, and if so, restore
172     // the displaced header in the object - if the object header is not pointing to
173     // the displaced header, get the object header instead
174     // if the object header was not pointing to the displaced header,
175     // we do unlocking via runtime call
176     if (hdr_offset) {
177       lea(rscratch1, Address(obj, hdr_offset));
178       cmpxchgptr(disp_hdr, hdr, rscratch1, rscratch2, done, &slow_case);
179     } else {
180       cmpxchgptr(disp_hdr, hdr, obj, rscratch2, done, &slow_case);
181     }
182     // done
183     bind(done);
184   }


185 }
186 
187 
188 // Defines obj, preserves var_size_in_bytes
189 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) {
190   if (UseTLAB) {
191     tlab_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
192   } else {
193     eden_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, slow_case);
194   }
195 }
196 
197 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
198   assert_different_registers(obj, klass, len);
199   if (UseCompactObjectHeaders || (UseBiasedLocking && !len->is_valid())) {
200     assert_different_registers(obj, klass, len, t1, t2);
201     ldr(t1, Address(klass, Klass::prototype_header_offset()));
202   } else {
203     // This assumes that all prototype bits fit in an int32_t
204     mov(t1, (int32_t)(intptr_t)markWord::prototype().value());
205   }
206   str(t1, Address(obj, oopDesc::mark_offset_in_bytes()));
207 
208   if (!UseCompactObjectHeaders) {
209     if (UseCompressedClassPointers) { // Take care not to kill klass
210       encode_klass_not_null(t1, klass);
211       strw(t1, Address(obj, oopDesc::klass_offset_in_bytes()));
212     } else {
213       str(klass, Address(obj, oopDesc::klass_offset_in_bytes()));
214     }
215   }
216 
217   if (len->is_valid()) {
218     strw(len, Address(obj, arrayOopDesc::length_offset_in_bytes()));
219   } else if (UseCompressedClassPointers && !UseCompactObjectHeaders) {
220     store_klass_gap(obj, zr);
221   }
222 }
223 
224 // preserves obj, destroys len_in_bytes
225 //
226 // Scratch registers: t1 = r10, t2 = r11
227 //
228 void C1_MacroAssembler::initialize_body(Register obj, Register len_in_bytes, int hdr_size_in_bytes, Register t1, Register t2) {
229   assert(hdr_size_in_bytes >= 0, "header size must be positive or 0");
230   assert(t1 == r10 && t2 == r11, "must be");
231 
232   Label done;
233 
234   // len_in_bytes is positive and ptr sized
235   subs(len_in_bytes, len_in_bytes, hdr_size_in_bytes);
236   br(Assembler::EQ, done);
237 
238   // Zero first 4 bytes, if start offset is not word aligned.
239   if (!is_aligned(hdr_size_in_bytes, BytesPerWord)) {
240     strw(zr, Address(obj, hdr_size_in_bytes));
241     hdr_size_in_bytes += BytesPerInt;
242   }
243 
244   // zero_words() takes ptr in r10 and count in words in r11
245   mov(rscratch1, len_in_bytes);
246   lea(t1, Address(obj, hdr_size_in_bytes));
247   lsr(t2, rscratch1, LogBytesPerWord);
248   zero_words(t1, t2);
249 
250   bind(done);
251 }
252 
253 
254 void C1_MacroAssembler::allocate_object(Register obj, Register t1, Register t2, int header_size, int object_size, Register klass, Label& slow_case) {
255   assert_different_registers(obj, t1, t2); // XXX really?
256   assert(header_size >= 0 && object_size >= header_size, "illegal sizes");
257 
258   try_allocate(obj, noreg, object_size * BytesPerWord, t1, t2, slow_case);
259 
260   initialize_object(obj, klass, noreg, object_size * HeapWordSize, t1, t2, UseTLAB);
261 }
262 
263 // Scratch registers: t1 = r10, t2 = r11

273      const Register index = t2;
274      if (var_size_in_bytes != noreg) {
275        mov(index, var_size_in_bytes);
276        initialize_body(obj, index, hdr_size_in_bytes, t1, t2);
277      } else if (con_size_in_bytes > hdr_size_in_bytes) {
278        con_size_in_bytes -= hdr_size_in_bytes;
279        lea(t1, Address(obj, hdr_size_in_bytes));
280        zero_words(t1, con_size_in_bytes / BytesPerWord);
281      }
282   }
283 
284   membar(StoreStore);
285 
286   if (CURRENT_ENV->dtrace_alloc_probes()) {
287     assert(obj == r0, "must be");
288     far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
289   }
290 
291   verify_oop(obj);
292 }
293 void C1_MacroAssembler::allocate_array(Register obj, Register len, Register t1, Register t2, int base_offset_in_bytes, int f, Register klass, Label& slow_case) {
294   assert_different_registers(obj, len, t1, t2, klass);
295 
296   // determine alignment mask
297   assert(!(BytesPerWord & 1), "must be a multiple of 2 for masking code to work");
298 
299   // check for negative or excessive length
300   mov(rscratch1, (int32_t)max_array_allocation_length);
301   cmp(len, rscratch1);
302   br(Assembler::HS, slow_case);
303 
304   const Register arr_size = t2; // okay to be the same
305   // align object end
306   mov(arr_size, (int32_t)base_offset_in_bytes + MinObjAlignmentInBytesMask);
307   add(arr_size, arr_size, len, ext::uxtw, f);
308   andr(arr_size, arr_size, ~MinObjAlignmentInBytesMask);
309 
310   try_allocate(obj, arr_size, 0, t1, t2, slow_case);
311 
312   initialize_header(obj, klass, len, t1, t2);
313 
314   // clear rest of allocated space
315   initialize_body(obj, arr_size, base_offset_in_bytes, t1, t2);
316 
317   membar(StoreStore);
318 
319   if (CURRENT_ENV->dtrace_alloc_probes()) {
320     assert(obj == r0, "must be");
321     far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
322   }
323 
324   verify_oop(obj);
325 }
326 
327 
328 void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) {
329   verify_oop(receiver);
330   // explicit NULL check not needed since load from [klass_offset] causes a trap
331   // check against inline cache
332   if (UseCompactObjectHeaders) {
333     assert(!MacroAssembler::needs_explicit_null_check(oopDesc::mark_offset_in_bytes()), "must add explicit null check");
334   } else {
335     assert(!MacroAssembler::needs_explicit_null_check(oopDesc::klass_offset_in_bytes()), "must add explicit null check");
336   }
337   cmp_klass(receiver, iCache, rscratch1);
338 }
339 
340 
341 void C1_MacroAssembler::build_frame(int framesize, int bang_size_in_bytes) {
342   assert(bang_size_in_bytes >= framesize, "stack bang size incorrect");
343   // Make sure there is enough stack space for this method's activation.
344   // Note that we do this before creating a frame.
345   generate_stack_overflow_check(bang_size_in_bytes);
346   MacroAssembler::build_frame(framesize);
347 
348   // Insert nmethod entry barrier into frame.
349   BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
350   bs->nmethod_entry_barrier(this);
351 }
352 
353 void C1_MacroAssembler::remove_frame(int framesize) {
354   MacroAssembler::remove_frame(framesize);
355 }
356 
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