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src/hotspot/cpu/aarch64/c1_CodeStubs_aarch64.cpp

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236 
237 
238 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
239   __ bind(_entry);
240   if (_compute_lock) {
241     // lock_reg was destroyed by fast unlocking attempt => recompute it
242     ce->monitor_address(_monitor_ix, _lock_reg);
243   }
244   ce->store_parameter(_lock_reg->as_register(), 0);
245   // note: non-blocking leaf routine => no call info needed
246   Runtime1::StubID exit_id;
247   if (ce->compilation()->has_fpu_code()) {
248     exit_id = Runtime1::monitorexit_id;
249   } else {
250     exit_id = Runtime1::monitorexit_nofpu_id;
251   }
252   __ adr(lr, _continuation);
253   __ far_jump(RuntimeAddress(Runtime1::entry_for(exit_id)));
254 }
255 

























256 
257 // Implementation of patching:
258 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)
259 // - Replace original code with a call to the stub
260 // At Runtime:
261 // - call to stub, jump to runtime
262 // - in runtime: preserve all registers (rspecially objects, i.e., source and destination object)
263 // - in runtime: after initializing class, restore original code, reexecute instruction
264 
265 int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;
266 
267 void PatchingStub::align_patch_site(MacroAssembler* masm) {
268 }
269 
270 void PatchingStub::emit_code(LIR_Assembler* ce) {
271   assert(false, "AArch64 should not use C1 runtime patching");
272 }
273 
274 
275 void DeoptimizeStub::emit_code(LIR_Assembler* ce) {

236 
237 
238 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
239   __ bind(_entry);
240   if (_compute_lock) {
241     // lock_reg was destroyed by fast unlocking attempt => recompute it
242     ce->monitor_address(_monitor_ix, _lock_reg);
243   }
244   ce->store_parameter(_lock_reg->as_register(), 0);
245   // note: non-blocking leaf routine => no call info needed
246   Runtime1::StubID exit_id;
247   if (ce->compilation()->has_fpu_code()) {
248     exit_id = Runtime1::monitorexit_id;
249   } else {
250     exit_id = Runtime1::monitorexit_nofpu_id;
251   }
252   __ adr(lr, _continuation);
253   __ far_jump(RuntimeAddress(Runtime1::entry_for(exit_id)));
254 }
255 
256 void LoadKlassStub::emit_code(LIR_Assembler* ce) {
257   __ bind(_entry);
258   Register res = _result->as_register();
259   ce->store_parameter(_obj->as_register(), 0);
260   if (res != r0) {
261     // Note: we cannot push/pop r0 around the call, because that
262     // would mess with the stack pointer sp, and we need that to
263     // remain intact for store_paramater/load_argument to work correctly.
264     // We swap r0 and res instead, which preserves current r0 in res.
265     // The preserved value is later saved and restored around the
266     // call in Runtime1::load_klass_id.
267     __ mov(rscratch1, r0);
268     __ mov(r0, res);
269     __ mov(res, rscratch1);
270   }
271   __ far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::load_klass_id)));
272   if (res != r0) {
273     // Swap back r0 and res. This brings the call return value
274     // from r0 into res, and the preserved value in res back into r0.
275     __ mov(rscratch1, r0);
276     __ mov(r0, res);
277     __ mov(res, rscratch1);
278   }
279   __ b(_continuation);
280 }
281 
282 // Implementation of patching:
283 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)
284 // - Replace original code with a call to the stub
285 // At Runtime:
286 // - call to stub, jump to runtime
287 // - in runtime: preserve all registers (rspecially objects, i.e., source and destination object)
288 // - in runtime: after initializing class, restore original code, reexecute instruction
289 
290 int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;
291 
292 void PatchingStub::align_patch_site(MacroAssembler* masm) {
293 }
294 
295 void PatchingStub::emit_code(LIR_Assembler* ce) {
296   assert(false, "AArch64 should not use C1 runtime patching");
297 }
298 
299 
300 void DeoptimizeStub::emit_code(LIR_Assembler* ce) {
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