112       // so we make more room by moving sp down by argsize
113       int argsize = FKind::stack_argsize(f);
114       sp -= argsize;
115     }
116     caller.set_sp(sp + fsize);
117 
118     assert(_cont.tail()->is_in_chunk(sp), "");
119 
120     return frame(sp, sp, fp, f.pc(), nullptr, nullptr, true /* on_heap */);
121   }
122 }
123 
124 void FreezeBase::adjust_interpreted_frame_unextended_sp(frame& f) {
125   assert((f.at(frame::interpreter_frame_last_sp_offset) != 0) || (f.unextended_sp() == f.sp()), "");
126   intptr_t* real_unextended_sp = (intptr_t*)f.at_relative_or_null(frame::interpreter_frame_last_sp_offset);
127   if (real_unextended_sp != nullptr) {
128     f.set_unextended_sp(real_unextended_sp); // can be null at a safepoint
129   }
130 }
131 






132 inline void FreezeBase::relativize_interpreted_frame_metadata(const frame& f, const frame& hf) {
133   assert(hf.fp() == hf.unextended_sp() + (f.fp() - f.unextended_sp()), "");
134   assert((f.at(frame::interpreter_frame_last_sp_offset) != 0)
135     || (f.unextended_sp() == f.sp()), "");
136   assert(f.fp() > (intptr_t*)f.at_relative(frame::interpreter_frame_initial_sp_offset), "");
137 
138   // on AARCH64, we may insert padding between the locals and the rest of the frame
139   // (see TemplateInterpreterGenerator::generate_normal_entry, and AbstractInterpreter::layout_activation)
140   // because we freeze the padding word (see recurse_freeze_interpreted_frame) in order to keep the same relativized
141   // locals value, we don't need to change the locals value here.
142 
143   // Make sure that last_sp is already relativized.
144   assert((intptr_t*)hf.at_relative(frame::interpreter_frame_last_sp_offset) == hf.unextended_sp(), "");
145 
146   // Make sure that monitor_block_top is already relativized.
147   assert(hf.at_absolute(frame::interpreter_frame_monitor_block_top_offset) <= frame::interpreter_frame_initial_sp_offset, "");
148 
149   // extended_sp is already relativized by TemplateInterpreterGenerator::generate_normal_entry or
150   // AbstractInterpreter::layout_activation
151 

218     intptr_t* fp = frame_sp + (hf.fp() - heap_sp);
219     if ((intptr_t)fp % frame::frame_alignment != 0) {
220       fp--;
221       frame_sp--;
222       log_develop_trace(continuations)("Adding internal interpreted frame alignment");
223     }
224     DEBUG_ONLY(intptr_t* unextended_sp = fp + *hf.addr_at(frame::interpreter_frame_last_sp_offset);)
225     assert(frame_sp == unextended_sp, "");
226     caller.set_sp(fp + frame::sender_sp_offset);
227     frame f(frame_sp, frame_sp, fp, hf.pc());
228     // we need to set the locals so that the caller of new_stack_frame() can call
229     // ContinuationHelper::InterpretedFrame::frame_bottom
230     // copy relativized locals from the heap frame
231     *f.addr_at(frame::interpreter_frame_locals_offset) = *hf.addr_at(frame::interpreter_frame_locals_offset);
232     assert((intptr_t)f.fp() % frame::frame_alignment == 0, "");
233     return f;
234   } else {
235     int fsize = FKind::size(hf);
236     intptr_t* frame_sp = caller.unextended_sp() - fsize;
237     if (bottom || caller.is_interpreted_frame()) {
238       int argsize = hf.compiled_frame_stack_argsize();
239 
240       fsize += argsize;
241       frame_sp   -= argsize;
242       caller.set_sp(caller.sp() - argsize);
243       assert(caller.sp() == frame_sp + (fsize-argsize), "");
244 
245       frame_sp = align(hf, frame_sp, caller, bottom);
246     }
247 
248     assert(hf.cb() != nullptr, "");
249     assert(hf.oop_map() != nullptr, "");
250     intptr_t* fp;
251     if (PreserveFramePointer) {
252       // we need to recreate a "real" frame pointer, pointing into the stack
253       fp = frame_sp + FKind::size(hf) - frame::sender_sp_offset;
254     } else {
255       fp = FKind::stub
256         ? frame_sp + fsize - frame::sender_sp_offset // on AArch64, this value is used for the safepoint stub
257         : *(intptr_t**)(hf.sp() - frame::sender_sp_offset); // we need to re-read fp because it may be an oop and we might have fixed the frame.
258     }
259     return frame(frame_sp, frame_sp, fp, hf.pc(), hf.cb(), hf.oop_map(), false); // TODO PERF : this computes deopt state; is it necessary?
260   }
261 }
262 
263 inline intptr_t* ThawBase::align(const frame& hf, intptr_t* frame_sp, frame& caller, bool bottom) {
264 #ifdef _LP64
265   if (((intptr_t)frame_sp & 0xf) != 0) {
266     assert(caller.is_interpreted_frame() || (bottom && hf.compiled_frame_stack_argsize() % 2 != 0), "");
267     frame_sp--;
268     caller.set_sp(caller.sp() - 1);
269   }
270   assert(is_aligned(frame_sp, frame::frame_alignment), "");
271 #endif
272 
273   return frame_sp;
274 }
275 
276 inline void ThawBase::patch_pd(frame& f, const frame& caller) {
277   patch_callee_link(caller, caller.fp());
278 }
279 


























































280 inline void ThawBase::derelativize_interpreted_frame_metadata(const frame& hf, const frame& f) {
281   // Make sure that last_sp is kept relativized.
282   assert((intptr_t*)f.at_relative(frame::interpreter_frame_last_sp_offset) == f.unextended_sp(), "");
283 
284   // Make sure that monitor_block_top is still relativized.
285   assert(f.at_absolute(frame::interpreter_frame_monitor_block_top_offset) <= frame::interpreter_frame_initial_sp_offset, "");
286 
287   // Make sure that extended_sp is kept relativized.
288   assert((intptr_t*)f.at_relative(frame::interpreter_frame_extended_sp_offset) < f.unextended_sp(), "");
289 }
290 
291 #endif // CPU_AARCH64_CONTINUATIONFREEZETHAW_AARCH64_INLINE_HPP

112       // so we make more room by moving sp down by argsize
113       int argsize = FKind::stack_argsize(f);
114       sp -= argsize;
115     }
116     caller.set_sp(sp + fsize);
117 
118     assert(_cont.tail()->is_in_chunk(sp), "");
119 
120     return frame(sp, sp, fp, f.pc(), nullptr, nullptr, true /* on_heap */);
121   }
122 }
123 
124 void FreezeBase::adjust_interpreted_frame_unextended_sp(frame& f) {
125   assert((f.at(frame::interpreter_frame_last_sp_offset) != 0) || (f.unextended_sp() == f.sp()), "");
126   intptr_t* real_unextended_sp = (intptr_t*)f.at_relative_or_null(frame::interpreter_frame_last_sp_offset);
127   if (real_unextended_sp != nullptr) {
128     f.set_unextended_sp(real_unextended_sp); // can be null at a safepoint
129   }
130 }
131 
132 inline void FreezeBase::prepare_freeze_interpreted_top_frame(const frame& f) {
133   assert(*f.addr_at(frame::interpreter_frame_last_sp_offset) == 0, "should be null for top frame");
134   intptr_t* lspp = f.addr_at(frame::interpreter_frame_last_sp_offset);
135   *lspp = f.unextended_sp() - f.fp();
136 }
137 
138 inline void FreezeBase::relativize_interpreted_frame_metadata(const frame& f, const frame& hf) {
139   assert(hf.fp() == hf.unextended_sp() + (f.fp() - f.unextended_sp()), "");
140   assert((f.at(frame::interpreter_frame_last_sp_offset) != 0)
141     || (f.unextended_sp() == f.sp()), "");
142   assert(f.fp() > (intptr_t*)f.at_relative(frame::interpreter_frame_initial_sp_offset), "");
143 
144   // on AARCH64, we may insert padding between the locals and the rest of the frame
145   // (see TemplateInterpreterGenerator::generate_normal_entry, and AbstractInterpreter::layout_activation)
146   // because we freeze the padding word (see recurse_freeze_interpreted_frame) in order to keep the same relativized
147   // locals value, we don't need to change the locals value here.
148 
149   // Make sure that last_sp is already relativized.
150   assert((intptr_t*)hf.at_relative(frame::interpreter_frame_last_sp_offset) == hf.unextended_sp(), "");
151 
152   // Make sure that monitor_block_top is already relativized.
153   assert(hf.at_absolute(frame::interpreter_frame_monitor_block_top_offset) <= frame::interpreter_frame_initial_sp_offset, "");
154 
155   // extended_sp is already relativized by TemplateInterpreterGenerator::generate_normal_entry or
156   // AbstractInterpreter::layout_activation
157 

224     intptr_t* fp = frame_sp + (hf.fp() - heap_sp);
225     if ((intptr_t)fp % frame::frame_alignment != 0) {
226       fp--;
227       frame_sp--;
228       log_develop_trace(continuations)("Adding internal interpreted frame alignment");
229     }
230     DEBUG_ONLY(intptr_t* unextended_sp = fp + *hf.addr_at(frame::interpreter_frame_last_sp_offset);)
231     assert(frame_sp == unextended_sp, "");
232     caller.set_sp(fp + frame::sender_sp_offset);
233     frame f(frame_sp, frame_sp, fp, hf.pc());
234     // we need to set the locals so that the caller of new_stack_frame() can call
235     // ContinuationHelper::InterpretedFrame::frame_bottom
236     // copy relativized locals from the heap frame
237     *f.addr_at(frame::interpreter_frame_locals_offset) = *hf.addr_at(frame::interpreter_frame_locals_offset);
238     assert((intptr_t)f.fp() % frame::frame_alignment == 0, "");
239     return f;
240   } else {
241     int fsize = FKind::size(hf);
242     intptr_t* frame_sp = caller.unextended_sp() - fsize;
243     if (bottom || caller.is_interpreted_frame()) {
244       int argsize = FKind::stack_argsize(hf);
245 
246       fsize += argsize;
247       frame_sp   -= argsize;
248       caller.set_sp(caller.sp() - argsize);
249       assert(caller.sp() == frame_sp + (fsize-argsize), "");
250 
251       frame_sp = align(hf, frame_sp, caller, bottom);
252     }
253 
254     assert(hf.cb() != nullptr, "");
255     assert(hf.oop_map() != nullptr, "");
256     intptr_t* fp;
257     if (PreserveFramePointer) {
258       // we need to recreate a "real" frame pointer, pointing into the stack
259       fp = frame_sp + FKind::size(hf) - frame::sender_sp_offset;
260     } else {
261       fp = FKind::stub
262         ? frame_sp + fsize - frame::sender_sp_offset // fp always points to the address below the pushed return pc. We need correct address.
263         : *(intptr_t**)(hf.sp() - frame::sender_sp_offset); // we need to re-read fp because it may be an oop and we might have fixed the frame.
264     }
265     return frame(frame_sp, frame_sp, fp, hf.pc(), hf.cb(), hf.oop_map(), false); // TODO PERF : this computes deopt state; is it necessary?
266   }
267 }
268 
269 inline intptr_t* ThawBase::align(const frame& hf, intptr_t* frame_sp, frame& caller, bool bottom) {
270 #ifdef _LP64
271   if (((intptr_t)frame_sp & 0xf) != 0) {
272     assert(caller.is_interpreted_frame() || (bottom && hf.compiled_frame_stack_argsize() % 2 != 0), "");
273     frame_sp--;
274     caller.set_sp(caller.sp() - 1);
275   }
276   assert(is_aligned(frame_sp, frame::frame_alignment), "");
277 #endif
278 
279   return frame_sp;
280 }
281 
282 inline void ThawBase::patch_pd(frame& f, const frame& caller) {
283   patch_callee_link(caller, caller.fp());
284 }
285 
286 inline void ThawBase::patch_pd(frame& f, intptr_t* caller_sp) {
287   Unimplemented();
288 }
289 
290 inline intptr_t* ThawBase::push_preempt_rerun_adapter(frame top, bool is_interpreted_frame) {
291   intptr_t* sp = top.sp();
292   CodeBlob* cb = top.cb();
293   if (!is_interpreted_frame && cb->frame_size() == 2) {
294     // C2 runtime stub case. For aarch64 the real size of the c2 runtime stub is 2 words bigger
295     // than what we think, i.e. size is 4. This is because the _last_Java_sp is not set to the
296     // sp right before making the call to the VM, but rather it is artificially set 2 words above
297     // this real sp so that we can store the return address at last_Java_sp[-1], and keep this
298     // property where we can retrieve the last_Java_pc from the last_Java_sp. But that means that
299     // once we return to the runtime stub, the code will adjust sp according to this real size.
300     // So we must adjust the frame size back here. We just copy lr/rfp again. These 2 top words
301     // will be the ones popped in generate_cont_preempt_rerun_compiler_adapter(). The other 2 words
302     // will just be discarded once back in the runtime stub (add sp, sp, #0x10).
303     sp -= 2;
304     sp[-2] = sp[0];
305     sp[-1] = sp[1];
306   }
307 
308   intptr_t* fp = sp - frame::sender_sp_offset;
309   address pc = is_interpreted_frame ? Interpreter::cont_preempt_rerun_interpreter_adapter()
310                                     : StubRoutines::cont_preempt_rerun_compiler_adapter();
311 
312   sp -= frame::metadata_words;
313   *(address*)(sp - frame::sender_sp_ret_address_offset()) = pc;
314   *(intptr_t**)(sp - frame::sender_sp_offset) = fp;
315 
316   log_develop_trace(continuations, preempt)("push_preempt_rerun_%s_adapter() initial sp: " INTPTR_FORMAT " final sp: " INTPTR_FORMAT " fp: " INTPTR_FORMAT,
317     is_interpreted_frame ? "interpreter" : "safepointblob", p2i(sp + frame::metadata_words), p2i(sp), p2i(fp));
318   return sp;
319 }
320 
321 inline intptr_t* ThawBase::push_preempt_monitorenter_redo(stackChunkOop chunk) {
322 
323   // fprintf(stderr, "push_preempt_monitorenter_redo\n");
324   frame enterSpecial = new_entry_frame();
325   intptr_t* sp = enterSpecial.sp();
326 
327   // First push the return barrier frame
328   sp -= frame::metadata_words;
329   sp[1] = (intptr_t)StubRoutines::cont_returnBarrier();
330   sp[0] = (intptr_t)enterSpecial.fp();
331 
332   // Now push the ObjectMonitor*
333   sp -= frame::metadata_words;
334   sp[1] = (intptr_t)chunk->objectMonitor(); // alignment
335   sp[0] = (intptr_t)chunk->objectMonitor();
336 
337   // Finally arrange to return to the monitorenter_redo stub
338   sp[-1] = (intptr_t)StubRoutines::cont_preempt_monitorenter_redo();
339   sp[-2] = (intptr_t)enterSpecial.fp();
340   log_develop_trace(continuations, preempt)("push_preempt_monitorenter_redo initial sp: " INTPTR_FORMAT " final sp: " INTPTR_FORMAT, p2i(sp + 2 * frame::metadata_words), p2i(sp));
341   return sp;
342 }
343 
344 inline void ThawBase::derelativize_interpreted_frame_metadata(const frame& hf, const frame& f) {
345   // Make sure that last_sp is kept relativized.
346   assert((intptr_t*)f.at_relative(frame::interpreter_frame_last_sp_offset) == f.unextended_sp(), "");
347 
348   // Make sure that monitor_block_top is still relativized.
349   assert(f.at_absolute(frame::interpreter_frame_monitor_block_top_offset) <= frame::interpreter_frame_initial_sp_offset, "");
350 
351   // Make sure that extended_sp is kept relativized.
352   assert((intptr_t*)f.at_relative(frame::interpreter_frame_extended_sp_offset) < f.unextended_sp(), "");
353 }
354 
355 #endif // CPU_AARCH64_CONTINUATIONFREEZETHAW_AARCH64_INLINE_HPP