< prev index next >

src/hotspot/cpu/aarch64/continuationFreezeThaw_aarch64.inline.hpp

Print this page

 50   // copy the spilled fp from the heap to the stack
 51   *(frame_sp - frame::sender_sp_offset) = *(heap_sp - frame::sender_sp_offset);
 52 }
 53 
 54 // Slow path
 55 
 56 template<typename FKind>
 57 inline frame FreezeBase::sender(const frame& f) {
 58   assert(FKind::is_instance(f), "");
 59   if (FKind::interpreted) {
 60     return frame(f.sender_sp(), f.interpreter_frame_sender_sp(), f.link(), f.sender_pc());
 61   }
 62   intptr_t** link_addr = link_address<FKind>(f);
 63 
 64   intptr_t* sender_sp = (intptr_t*)(link_addr + frame::sender_sp_offset); //  f.unextended_sp() + (fsize/wordSize); //
 65   address sender_pc = ContinuationHelper::return_address_at(sender_sp - 1);
 66   assert(sender_sp != f.sp(), "must have changed");
 67 
 68   int slot = 0;
 69   CodeBlob* sender_cb = CodeCache::find_blob_and_oopmap(sender_pc, slot);






 70   return sender_cb != nullptr
 71     ? frame(sender_sp, sender_sp, *link_addr, sender_pc, sender_cb,
 72             slot == -1 ? nullptr : sender_cb->oop_map_for_slot(slot, sender_pc),
 73             false /* on_heap ? */)
 74     : frame(sender_sp, sender_sp, *link_addr, sender_pc);
 75 }
 76 
 77 template<typename FKind>
 78 frame FreezeBase::new_heap_frame(frame& f, frame& caller) {
 79   assert(FKind::is_instance(f), "");
 80   assert(!caller.is_interpreted_frame()
 81     || caller.unextended_sp() == (intptr_t*)caller.at(frame::interpreter_frame_last_sp_offset), "");
 82 
 83   intptr_t *sp, *fp; // sp is really our unextended_sp
 84   if (FKind::interpreted) {
 85     assert((intptr_t*)f.at(frame::interpreter_frame_last_sp_offset) == nullptr
 86       || f.unextended_sp() == (intptr_t*)f.at_relative(frame::interpreter_frame_last_sp_offset), "");
 87     intptr_t locals_offset = *f.addr_at(frame::interpreter_frame_locals_offset);
 88     // If the caller.is_empty(), i.e. we're freezing into an empty chunk, then we set
 89     // the chunk's argsize in finalize_freeze and make room for it above the unextended_sp
 90     bool overlap_caller = caller.is_interpreted_frame() || caller.is_empty();
 91     fp = caller.unextended_sp() - 1 - locals_offset + (overlap_caller ? ContinuationHelper::InterpretedFrame::stack_argsize(f) : 0);
 92     sp = fp - (f.fp() - f.unextended_sp());
 93     assert(sp <= fp, "");
 94     assert(fp <= caller.unextended_sp(), "");
 95     caller.set_sp(fp + frame::sender_sp_offset);
 96 
 97     assert(_cont.tail()->is_in_chunk(sp), "");
 98 
 99     frame hf(sp, sp, fp, f.pc(), nullptr, nullptr, true /* on_heap */);
100     // copy relativized locals from the stack frame
101     *hf.addr_at(frame::interpreter_frame_locals_offset) = locals_offset;
102     return hf;
103   } else {
104     // For a compiled frame we need to re-read fp out of the frame because it may be an
105     // oop and we might have had a safepoint in finalize_freeze, after constructing f.
106     // For stub/native frames the value is not used while frozen, and will be constructed again
107     // when thawing the frame (see ThawBase::new_stack_frame). We use a special bad address to
108     // help with debugging, particularly when inspecting frames and identifying invalid accesses.
109     fp = FKind::compiled ? *(intptr_t**)(f.sp() - frame::sender_sp_offset) : (intptr_t*)badAddressVal;
110 
111     int fsize = FKind::size(f);
112     sp = caller.unextended_sp() - fsize;
113     if (caller.is_interpreted_frame()) {
114       // If the caller is interpreted, our stackargs are not supposed to overlap with it
115       // so we make more room by moving sp down by argsize
116       int argsize = FKind::stack_argsize(f);
117       sp -= argsize;
118     }
119     caller.set_sp(sp + fsize);
120 
121     assert(_cont.tail()->is_in_chunk(sp), "");
122 
123     return frame(sp, sp, fp, f.pc(), nullptr, nullptr, true /* on_heap */);
124   }
125 }
126 
127 void FreezeBase::adjust_interpreted_frame_unextended_sp(frame& f) {
128   assert((f.at(frame::interpreter_frame_last_sp_offset) != 0) || (f.unextended_sp() == f.sp()), "");
129   intptr_t* real_unextended_sp = (intptr_t*)f.at_relative_or_null(frame::interpreter_frame_last_sp_offset);
130   if (real_unextended_sp != nullptr) {
131     f.set_unextended_sp(real_unextended_sp); // can be null at a safepoint
132   }
133 }

166   assert((hf.fp() - hf.unextended_sp()) == (f.fp() - f.unextended_sp()), "");
167   assert(hf.unextended_sp() == (intptr_t*)hf.at(frame::interpreter_frame_last_sp_offset), "");
168   assert(hf.unextended_sp() <= (intptr_t*)hf.at(frame::interpreter_frame_initial_sp_offset), "");
169   assert(hf.unextended_sp() + extra_space >  (intptr_t*)hf.at(frame::interpreter_frame_extended_sp_offset), "");
170   assert(hf.fp()            >  (intptr_t*)hf.at(frame::interpreter_frame_initial_sp_offset), "");
171   assert(hf.fp()            <= (intptr_t*)hf.at(frame::interpreter_frame_locals_offset), "");
172 }
173 
174 inline void FreezeBase::set_top_frame_metadata_pd(const frame& hf) {
175   stackChunkOop chunk = _cont.tail();
176   assert(chunk->is_in_chunk(hf.sp() - 1), "");
177   assert(chunk->is_in_chunk(hf.sp() - frame::sender_sp_offset), "");
178 
179   *(hf.sp() - 1) = (intptr_t)hf.pc();
180 
181   intptr_t* fp_addr = hf.sp() - frame::sender_sp_offset;
182   *fp_addr = hf.is_interpreted_frame() ? (intptr_t)(hf.fp() - fp_addr)
183                                        : (intptr_t)hf.fp();
184 }
185 
186 inline void FreezeBase::patch_pd(frame& hf, const frame& caller) {
187   if (caller.is_interpreted_frame()) {
188     assert(!caller.is_empty(), "");
189     patch_callee_link_relative(caller, caller.fp());
190   } else {

191     // If we're the bottom-most frame frozen in this freeze, the caller might have stayed frozen in the chunk,
192     // and its oop-containing fp fixed. We've now just overwritten it, so we must patch it back to its value
193     // as read from the chunk.
194     patch_callee_link(caller, caller.fp());
195   }
196 }
197 
198 inline void FreezeBase::patch_pd_unused(intptr_t* sp) {
199   intptr_t* fp_addr = sp - frame::sender_sp_offset;
200   *fp_addr = badAddressVal;
201 }
202 
203 //////// Thaw
204 
205 // Fast path
206 
207 inline void ThawBase::prefetch_chunk_pd(void* start, int size) {
208   size <<= LogBytesPerWord;
209   Prefetch::read(start, size);
210   Prefetch::read(start, size - 64);
211 }
212 
213 template <typename ConfigT>
214 inline void Thaw<ConfigT>::patch_caller_links(intptr_t* sp, intptr_t* bottom) {
215   // Fast path depends on !PreserveFramePointer. See can_thaw_fast().
216   assert(!PreserveFramePointer, "Frame pointers need to be fixed");
217 }
218 
219 // Slow path
220 
221 inline frame ThawBase::new_entry_frame() {
222   intptr_t* sp = _cont.entrySP();
223   return frame(sp, sp, _cont.entryFP(), _cont.entryPC()); // TODO PERF: This finds code blob and computes deopt state
224 }
225 
226 template<typename FKind> frame ThawBase::new_stack_frame(const frame& hf, frame& caller, bool bottom) {
227   assert(FKind::is_instance(hf), "");
228   // The values in the returned frame object will be written into the callee's stack in patch.
229 
230   if (FKind::interpreted) {
231     intptr_t* heap_sp = hf.unextended_sp();
232     // If caller is interpreted it already made room for the callee arguments
233     int overlap = caller.is_interpreted_frame() ? ContinuationHelper::InterpretedFrame::stack_argsize(hf) : 0;
234     const int fsize = (int)(ContinuationHelper::InterpretedFrame::frame_bottom(hf) - hf.unextended_sp() - overlap);
235     intptr_t* frame_sp = caller.unextended_sp() - fsize;
236     intptr_t* fp = frame_sp + (hf.fp() - heap_sp);
237     if ((intptr_t)fp % frame::frame_alignment != 0) {
238       fp--;
239       frame_sp--;
240       log_develop_trace(continuations)("Adding internal interpreted frame alignment");
241     }
242     DEBUG_ONLY(intptr_t* unextended_sp = fp + *hf.addr_at(frame::interpreter_frame_last_sp_offset);)
243     assert(frame_sp == unextended_sp, "");
244     caller.set_sp(fp + frame::sender_sp_offset);
245     frame f(frame_sp, frame_sp, fp, hf.pc());
246     // we need to set the locals so that the caller of new_stack_frame() can call
247     // ContinuationHelper::InterpretedFrame::frame_bottom
248     // copy relativized locals from the heap frame
249     *f.addr_at(frame::interpreter_frame_locals_offset) = *hf.addr_at(frame::interpreter_frame_locals_offset);
250     assert((intptr_t)f.fp() % frame::frame_alignment == 0, "");
251     return f;
252   } else {
253     int fsize = FKind::size(hf);
254     intptr_t* frame_sp = caller.unextended_sp() - fsize;
255     if (bottom || caller.is_interpreted_frame()) {
256       int argsize = FKind::stack_argsize(hf);
257 
258       fsize += argsize;
259       frame_sp   -= argsize;
260       caller.set_sp(caller.sp() - argsize);
261       assert(caller.sp() == frame_sp + (fsize-argsize), "");
262 
263       frame_sp = align(hf, frame_sp, caller, bottom);
264     }


265 
266     assert(hf.cb() != nullptr, "");
267     assert(hf.oop_map() != nullptr, "");
268     intptr_t* fp;
269     if (PreserveFramePointer) {
270       // we need to recreate a "real" frame pointer, pointing into the stack
271       fp = frame_sp + FKind::size(hf) - frame::sender_sp_offset;
272     } else {
273       fp = FKind::stub || FKind::native
274         ? frame_sp + fsize - frame::sender_sp_offset // fp always points to the address below the pushed return pc. We need correct address.
275         : *(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.
276     }
277     return frame(frame_sp, frame_sp, fp, hf.pc(), hf.cb(), hf.oop_map(), false); // TODO PERF : this computes deopt state; is it necessary?
278   }
279 }
280 
281 inline intptr_t* ThawBase::align(const frame& hf, intptr_t* frame_sp, frame& caller, bool bottom) {
282 #ifdef _LP64
283   if (((intptr_t)frame_sp & 0xf) != 0) {
284     assert(caller.is_interpreted_frame() || (bottom && hf.compiled_frame_stack_argsize() % 2 != 0), "");
285     frame_sp--;
286     caller.set_sp(caller.sp() - 1);
287   }
288   assert(is_aligned(frame_sp, frame::frame_alignment), "");
289 #endif
290 
291   return frame_sp;
292 }
293 
294 inline void ThawBase::patch_pd(frame& f, const frame& caller) {
295   patch_callee_link(caller, caller.fp());


296 }
297 
298 inline void ThawBase::patch_pd(frame& f, intptr_t* caller_sp) {
299   intptr_t* fp = caller_sp - frame::sender_sp_offset;
300   patch_callee_link(f, fp);
301 }
302 
303 inline intptr_t* ThawBase::push_cleanup_continuation() {
304   frame enterSpecial = new_entry_frame();
305   intptr_t* sp = enterSpecial.sp();
306 
307   sp[-1] = (intptr_t)ContinuationEntry::cleanup_pc();
308   sp[-2] = (intptr_t)enterSpecial.fp();
309 
310   log_develop_trace(continuations, preempt)("push_cleanup_continuation initial sp: " INTPTR_FORMAT " final sp: " INTPTR_FORMAT, p2i(sp + 2 * frame::metadata_words), p2i(sp));
311   return sp;
312 }
313 
314 inline void ThawBase::derelativize_interpreted_frame_metadata(const frame& hf, const frame& f) {
315   // Make sure that last_sp is kept relativized.

 50   // copy the spilled fp from the heap to the stack
 51   *(frame_sp - frame::sender_sp_offset) = *(heap_sp - frame::sender_sp_offset);
 52 }
 53 
 54 // Slow path
 55 
 56 template<typename FKind>
 57 inline frame FreezeBase::sender(const frame& f) {
 58   assert(FKind::is_instance(f), "");
 59   if (FKind::interpreted) {
 60     return frame(f.sender_sp(), f.interpreter_frame_sender_sp(), f.link(), f.sender_pc());
 61   }
 62   intptr_t** link_addr = link_address<FKind>(f);
 63 
 64   intptr_t* sender_sp = (intptr_t*)(link_addr + frame::sender_sp_offset); //  f.unextended_sp() + (fsize/wordSize); //
 65   address sender_pc = ContinuationHelper::return_address_at(sender_sp - 1);
 66   assert(sender_sp != f.sp(), "must have changed");
 67 
 68   int slot = 0;
 69   CodeBlob* sender_cb = CodeCache::find_blob_and_oopmap(sender_pc, slot);
 70 
 71   // Repair the sender sp if the frame has been extended
 72   if (sender_cb->is_nmethod()) {
 73     sender_sp = f.repair_sender_sp(sender_sp, link_addr);
 74   }
 75 
 76   return sender_cb != nullptr
 77     ? frame(sender_sp, sender_sp, *link_addr, sender_pc, sender_cb,
 78             slot == -1 ? nullptr : sender_cb->oop_map_for_slot(slot, sender_pc),
 79             false /* on_heap ? */)
 80     : frame(sender_sp, sender_sp, *link_addr, sender_pc);
 81 }
 82 
 83 template<typename FKind>
 84 frame FreezeBase::new_heap_frame(frame& f, frame& caller, int size_adjust) {
 85   assert(FKind::is_instance(f), "");
 86   assert(!caller.is_interpreted_frame()
 87     || caller.unextended_sp() == (intptr_t*)caller.at(frame::interpreter_frame_last_sp_offset), "");
 88 
 89   intptr_t *sp, *fp; // sp is really our unextended_sp
 90   if (FKind::interpreted) {
 91     assert((intptr_t*)f.at(frame::interpreter_frame_last_sp_offset) == nullptr
 92       || f.unextended_sp() == (intptr_t*)f.at_relative(frame::interpreter_frame_last_sp_offset), "");
 93     intptr_t locals_offset = *f.addr_at(frame::interpreter_frame_locals_offset);
 94     // If the caller.is_empty(), i.e. we're freezing into an empty chunk, then we set
 95     // the chunk's argsize in finalize_freeze and make room for it above the unextended_sp
 96     bool overlap_caller = caller.is_interpreted_frame() || caller.is_empty();
 97     fp = caller.unextended_sp() - 1 - locals_offset + (overlap_caller ? ContinuationHelper::InterpretedFrame::stack_argsize(f) : 0);
 98     sp = fp - (f.fp() - f.unextended_sp());
 99     assert(sp <= fp, "");
100     assert(fp <= caller.unextended_sp(), "");
101     caller.set_sp(fp + frame::sender_sp_offset);
102 
103     assert(_cont.tail()->is_in_chunk(sp), "");
104 
105     frame hf(sp, sp, fp, f.pc(), nullptr, nullptr, true /* on_heap */);
106     // copy relativized locals from the stack frame
107     *hf.addr_at(frame::interpreter_frame_locals_offset) = locals_offset;
108     return hf;
109   } else {
110     // For a compiled frame we need to re-read fp out of the frame because it may be an
111     // oop and we might have had a safepoint in finalize_freeze, after constructing f.
112     // For stub/native frames the value is not used while frozen, and will be constructed again
113     // when thawing the frame (see ThawBase::new_stack_frame). We use a special bad address to
114     // help with debugging, particularly when inspecting frames and identifying invalid accesses.
115     fp = FKind::compiled ? *(intptr_t**)(f.sp() - frame::sender_sp_offset) : (intptr_t*)badAddressVal;
116 
117     int fsize = FKind::size(f);
118     sp = caller.unextended_sp() - fsize - size_adjust;
119     if (caller.is_interpreted_frame() && size_adjust == 0) {
120       // If the caller is interpreted, our stackargs are not supposed to overlap with it
121       // so we make more room by moving sp down by argsize
122       int argsize = FKind::stack_argsize(f);
123       sp -= argsize;
124     }
125     caller.set_sp(sp + fsize);
126 
127     assert(_cont.tail()->is_in_chunk(sp), "");
128 
129     return frame(sp, sp, fp, f.pc(), nullptr, nullptr, true /* on_heap */);
130   }
131 }
132 
133 void FreezeBase::adjust_interpreted_frame_unextended_sp(frame& f) {
134   assert((f.at(frame::interpreter_frame_last_sp_offset) != 0) || (f.unextended_sp() == f.sp()), "");
135   intptr_t* real_unextended_sp = (intptr_t*)f.at_relative_or_null(frame::interpreter_frame_last_sp_offset);
136   if (real_unextended_sp != nullptr) {
137     f.set_unextended_sp(real_unextended_sp); // can be null at a safepoint
138   }
139 }

172   assert((hf.fp() - hf.unextended_sp()) == (f.fp() - f.unextended_sp()), "");
173   assert(hf.unextended_sp() == (intptr_t*)hf.at(frame::interpreter_frame_last_sp_offset), "");
174   assert(hf.unextended_sp() <= (intptr_t*)hf.at(frame::interpreter_frame_initial_sp_offset), "");
175   assert(hf.unextended_sp() + extra_space >  (intptr_t*)hf.at(frame::interpreter_frame_extended_sp_offset), "");
176   assert(hf.fp()            >  (intptr_t*)hf.at(frame::interpreter_frame_initial_sp_offset), "");
177   assert(hf.fp()            <= (intptr_t*)hf.at(frame::interpreter_frame_locals_offset), "");
178 }
179 
180 inline void FreezeBase::set_top_frame_metadata_pd(const frame& hf) {
181   stackChunkOop chunk = _cont.tail();
182   assert(chunk->is_in_chunk(hf.sp() - 1), "");
183   assert(chunk->is_in_chunk(hf.sp() - frame::sender_sp_offset), "");
184 
185   *(hf.sp() - 1) = (intptr_t)hf.pc();
186 
187   intptr_t* fp_addr = hf.sp() - frame::sender_sp_offset;
188   *fp_addr = hf.is_interpreted_frame() ? (intptr_t)(hf.fp() - fp_addr)
189                                        : (intptr_t)hf.fp();
190 }
191 
192 inline void FreezeBase::patch_pd(frame& hf, const frame& caller, bool is_bottom_frame) {
193   if (caller.is_interpreted_frame()) {
194     assert(!caller.is_empty(), "");
195     patch_callee_link_relative(caller, caller.fp());
196   } else if (is_bottom_frame && caller.pc() != nullptr) {
197     assert(caller.is_compiled_frame(), "");
198     // If we're the bottom-most frame frozen in this freeze, the caller might have stayed frozen in the chunk,
199     // and its oop-containing fp fixed. We've now just overwritten it, so we must patch it back to its value
200     // as read from the chunk.
201     patch_callee_link(caller, caller.fp());
202   }
203 }
204 
205 inline void FreezeBase::patch_pd_unused(intptr_t* sp) {
206   intptr_t* fp_addr = sp - frame::sender_sp_offset;
207   *fp_addr = badAddressVal;
208 }
209 
210 //////// Thaw
211 
212 // Fast path
213 
214 inline void ThawBase::prefetch_chunk_pd(void* start, int size) {
215   size <<= LogBytesPerWord;
216   Prefetch::read(start, size);
217   Prefetch::read(start, size - 64);
218 }
219 
220 template <typename ConfigT>
221 inline void Thaw<ConfigT>::patch_caller_links(intptr_t* sp, intptr_t* bottom) {
222   // Fast path depends on !PreserveFramePointer. See can_thaw_fast().
223   assert(!PreserveFramePointer, "Frame pointers need to be fixed");
224 }
225 
226 // Slow path
227 
228 inline frame ThawBase::new_entry_frame() {
229   intptr_t* sp = _cont.entrySP();
230   return frame(sp, sp, _cont.entryFP(), _cont.entryPC()); // TODO PERF: This finds code blob and computes deopt state
231 }
232 
233 template<typename FKind> frame ThawBase::new_stack_frame(const frame& hf, frame& caller, bool bottom, int size_adjust) {
234   assert(FKind::is_instance(hf), "");
235   // The values in the returned frame object will be written into the callee's stack in patch.
236 
237   if (FKind::interpreted) {
238     intptr_t* heap_sp = hf.unextended_sp();
239     // If caller is interpreted it already made room for the callee arguments
240     int overlap = caller.is_interpreted_frame() ? ContinuationHelper::InterpretedFrame::stack_argsize(hf) : 0;
241     const int fsize = (int)(ContinuationHelper::InterpretedFrame::frame_bottom(hf) - hf.unextended_sp() - overlap);
242     intptr_t* frame_sp = caller.unextended_sp() - fsize;
243     intptr_t* fp = frame_sp + (hf.fp() - heap_sp);
244     if ((intptr_t)fp % frame::frame_alignment != 0) {
245       fp--;
246       frame_sp--;
247       log_develop_trace(continuations)("Adding internal interpreted frame alignment");
248     }
249     DEBUG_ONLY(intptr_t* unextended_sp = fp + *hf.addr_at(frame::interpreter_frame_last_sp_offset);)
250     assert(frame_sp == unextended_sp, "");
251     caller.set_sp(fp + frame::sender_sp_offset);
252     frame f(frame_sp, frame_sp, fp, hf.pc());
253     // we need to set the locals so that the caller of new_stack_frame() can call
254     // ContinuationHelper::InterpretedFrame::frame_bottom
255     // copy relativized locals from the heap frame
256     *f.addr_at(frame::interpreter_frame_locals_offset) = *hf.addr_at(frame::interpreter_frame_locals_offset);
257     assert((intptr_t)f.fp() % frame::frame_alignment == 0, "");
258     return f;
259   } else {
260     int fsize = FKind::size(hf);
261     intptr_t* frame_sp = caller.unextended_sp() - fsize - size_adjust;
262     if (bottom || caller.is_interpreted_frame()) {
263       if (size_adjust == 0) {
264         int argsize = FKind::stack_argsize(hf);
265         frame_sp -= argsize;
266       }



267       frame_sp = align(hf, frame_sp, caller, bottom);
268     }
269     caller.set_sp(frame_sp + fsize);
270     assert(is_aligned(frame_sp, frame::frame_alignment), "");
271 
272     assert(hf.cb() != nullptr, "");
273     assert(hf.oop_map() != nullptr, "");
274     intptr_t* fp;
275     if (PreserveFramePointer) {
276       // we need to recreate a "real" frame pointer, pointing into the stack
277       fp = frame_sp + fsize - frame::sender_sp_offset;
278     } else {
279       fp = FKind::stub || FKind::native
280         ? frame_sp + fsize - frame::sender_sp_offset // fp always points to the address below the pushed return pc. We need correct address.
281         : *(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.
282     }
283     return frame(frame_sp, frame_sp, fp, hf.pc(), hf.cb(), hf.oop_map(), false); // TODO PERF : this computes deopt state; is it necessary?
284   }
285 }
286 
287 inline intptr_t* ThawBase::align(const frame& hf, intptr_t* frame_sp, frame& caller, bool bottom) {
288 #ifdef _LP64
289   if (((intptr_t)frame_sp & 0xf) != 0) {
290     assert(caller.is_interpreted_frame() || (bottom && hf.compiled_frame_stack_argsize() % 2 != 0), "");
291     frame_sp--;

292   }
293   assert(is_aligned(frame_sp, frame::frame_alignment), "");
294 #endif

295   return frame_sp;
296 }
297 
298 inline void ThawBase::patch_pd(frame& f, const frame& caller) {
299   if (caller.is_interpreted_frame() || PreserveFramePointer) {
300     patch_callee_link(caller, caller.fp());
301   }
302 }
303 
304 inline void ThawBase::patch_pd(frame& f, intptr_t* caller_sp) {
305   intptr_t* fp = caller_sp - frame::sender_sp_offset;
306   patch_callee_link(f, fp);
307 }
308 
309 inline intptr_t* ThawBase::push_cleanup_continuation() {
310   frame enterSpecial = new_entry_frame();
311   intptr_t* sp = enterSpecial.sp();
312 
313   sp[-1] = (intptr_t)ContinuationEntry::cleanup_pc();
314   sp[-2] = (intptr_t)enterSpecial.fp();
315 
316   log_develop_trace(continuations, preempt)("push_cleanup_continuation initial sp: " INTPTR_FORMAT " final sp: " INTPTR_FORMAT, p2i(sp + 2 * frame::metadata_words), p2i(sp));
317   return sp;
318 }
319 
320 inline void ThawBase::derelativize_interpreted_frame_metadata(const frame& hf, const frame& f) {
321   // Make sure that last_sp is kept relativized.
< prev index next >