1 /*
2 * Copyright (c) 2019, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
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
63 intptr_t** link_addr = link_address<FKind>(f);
64 intptr_t* sender_sp = (intptr_t*)(link_addr + 2); // f.unextended_sp() + (fsize/wordSize); //
65 address sender_pc = (address) *(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> frame FreezeBase::new_heap_frame(frame& f, frame& caller) {
78 assert(FKind::is_instance(f), "");
79 assert(!caller.is_interpreted_frame()
80 || caller.unextended_sp() == (intptr_t*)caller.at(frame::interpreter_frame_last_sp_offset), "");
81
82 intptr_t *sp, *fp; // sp is really our unextended_sp
83 if (FKind::interpreted) {
84 assert((intptr_t*)f.at(frame::interpreter_frame_last_sp_offset) == nullptr
85 || f.unextended_sp() == (intptr_t*)f.at_relative(frame::interpreter_frame_last_sp_offset), "");
86 intptr_t locals_offset = *f.addr_at(frame::interpreter_frame_locals_offset);
87 // If the caller.is_empty(), i.e. we're freezing into an empty chunk, then we set
88 // the chunk's argsize in finalize_freeze and make room for it above the unextended_sp
89 bool overlap_caller = caller.is_interpreted_frame() || caller.is_empty();
90 fp = caller.unextended_sp() - 1 - locals_offset + (overlap_caller ? ContinuationHelper::InterpretedFrame::stack_argsize(f) : 0);
91 sp = fp - (f.fp() - f.unextended_sp());
92 assert(sp <= fp, "");
93 assert(fp <= caller.unextended_sp(), "");
94 caller.set_sp(fp + frame::sender_sp_offset);
95
96 assert(_cont.tail()->is_in_chunk(sp), "");
97
98 frame hf(sp, sp, fp, f.pc(), nullptr, nullptr, true /* on_heap */);
99 *hf.addr_at(frame::interpreter_frame_locals_offset) = locals_offset;
100 return hf;
101 } else {
102 // We need to re-read fp out of the frame because it may be an oop and we might have
103 // had a safepoint in finalize_freeze, after constructing f.
104 fp = *(intptr_t**)(f.sp() - 2);
105
106 int fsize = FKind::size(f);
107 sp = caller.unextended_sp() - fsize;
108 if (caller.is_interpreted_frame()) {
109 // If the caller is interpreted, our stackargs are not supposed to overlap with it
110 // so we make more room by moving sp down by argsize
111 int argsize = FKind::stack_argsize(f);
112 sp -= argsize;
113 }
114 caller.set_sp(sp + fsize);
115
116 assert(_cont.tail()->is_in_chunk(sp), "");
117
118 return frame(sp, sp, fp, f.pc(), nullptr, nullptr, true /* on_heap */);
119 }
120 }
121
122 void FreezeBase::adjust_interpreted_frame_unextended_sp(frame& f) {
123 assert((f.at(frame::interpreter_frame_last_sp_offset) != 0) || (f.unextended_sp() == f.sp()), "");
124 intptr_t* real_unextended_sp = (intptr_t*)f.at_relative_or_null(frame::interpreter_frame_last_sp_offset);
125 if (real_unextended_sp != nullptr) {
126 f.set_unextended_sp(real_unextended_sp); // can be null at a safepoint
127 }
128 }
129
130 inline void FreezeBase::prepare_freeze_interpreted_top_frame(frame& f) {
131 assert(f.interpreter_frame_last_sp() == nullptr, "should be null for top frame");
132 f.interpreter_frame_set_last_sp(f.unextended_sp());
133 }
134
165 assert(hf.fp() > (intptr_t*)hf.at(frame::interpreter_frame_initial_sp_offset), "");
166 #ifdef ASSERT
167 if (f.interpreter_frame_method()->max_locals() > 0) {
168 assert(hf.fp() <= (intptr_t*)hf.at(frame::interpreter_frame_locals_offset), "");
169 }
170 #endif
171 }
172
173 inline void FreezeBase::set_top_frame_metadata_pd(const frame& hf) {
174 stackChunkOop chunk = _cont.tail();
175 assert(chunk->is_in_chunk(hf.sp() - 1), "");
176 assert(chunk->is_in_chunk(hf.sp() - 2), "");
177
178 *(hf.sp() - 1) = (intptr_t)hf.pc();
179
180 intptr_t* fp_addr = hf.sp() - 2;
181 *fp_addr = hf.is_interpreted_frame() ? (intptr_t)(hf.fp() - fp_addr)
182 : (intptr_t)hf.fp();
183 }
184
185 inline void FreezeBase::patch_pd(frame& hf, const frame& caller) {
186 if (caller.is_interpreted_frame()) {
187 assert(!caller.is_empty(), "");
188 patch_callee_link_relative(caller, caller.fp());
189 } else {
190 // If we're the bottom-most frame frozen in this freeze, the caller might have stayed frozen in the chunk,
191 // and its oop-containing fp fixed. We've now just overwritten it, so we must patch it back to its value
192 // as read from the chunk.
193 patch_callee_link(caller, caller.fp());
194 }
195 }
196
197 inline void FreezeBase::patch_pd_unused(intptr_t* sp) {
198 }
199
200 //////// Thaw
201
202 // Fast path
203
204 inline void ThawBase::prefetch_chunk_pd(void* start, int size) {
205 size <<= LogBytesPerWord;
206 Prefetch::read(start, size);
207 Prefetch::read(start, size - 64);
208 }
209
239 if (sp != _last_sp_from_frame) {
240 sp[-1] = (intptr_t)_top_frame.pc();
241 }
242 }
243 }
244
245 template <typename ConfigT>
246 inline void Thaw<ConfigT>::patch_caller_links(intptr_t* sp, intptr_t* bottom) {
247 // Fast path depends on !PreserveFramePointer. See can_thaw_fast().
248 assert(!PreserveFramePointer, "Frame pointers need to be fixed");
249 }
250
251 // Slow path
252
253 inline frame ThawBase::new_entry_frame() {
254 intptr_t* sp = _cont.entrySP();
255 // TODO PERF: This finds code blob and computes deopt state
256 return frame(sp, sp, _cont.entryFP(), _cont.entryPC());
257 }
258
259 template<typename FKind> frame ThawBase::new_stack_frame(const frame& hf, frame& caller, bool bottom) {
260 assert(FKind::is_instance(hf), "");
261 // The values in the returned frame object will be written into the callee's stack in patch.
262
263 if (FKind::interpreted) {
264 intptr_t* heap_sp = hf.unextended_sp();
265 // If caller is interpreted it already made room for the callee arguments
266 int overlap = caller.is_interpreted_frame() ? ContinuationHelper::InterpretedFrame::stack_argsize(hf) : 0;
267 const int fsize = (int)(ContinuationHelper::InterpretedFrame::frame_bottom(hf) - hf.unextended_sp() - overlap);
268 intptr_t* frame_sp = caller.unextended_sp() - fsize;
269 intptr_t* fp = frame_sp + (hf.fp() - heap_sp);
270 if ((intptr_t)fp % frame::frame_alignment != 0) {
271 fp--;
272 frame_sp--;
273 log_develop_trace(continuations)("Adding internal interpreted frame alignment");
274 }
275 DEBUG_ONLY(intptr_t* unextended_sp = fp + *hf.addr_at(frame::interpreter_frame_last_sp_offset);)
276 assert(frame_sp == unextended_sp, "");
277 caller.set_sp(fp + frame::sender_sp_offset);
278 frame f(frame_sp, frame_sp, fp, hf.pc());
279 // we need to set the locals so that the caller of new_stack_frame() can call
280 // ContinuationHelper::InterpretedFrame::frame_bottom
281 // copy relativized locals from the heap frame
282 *f.addr_at(frame::interpreter_frame_locals_offset) = *hf.addr_at(frame::interpreter_frame_locals_offset);
283 assert((intptr_t)f.fp() % frame::frame_alignment == 0, "");
284 return f;
285 } else {
286 int fsize = FKind::size(hf);
287 intptr_t* frame_sp = caller.unextended_sp() - fsize;
288 if (bottom || caller.is_interpreted_frame()) {
289 int argsize = FKind::stack_argsize(hf);
290
291 fsize += argsize;
292 frame_sp -= argsize;
293 caller.set_sp(caller.sp() - argsize);
294 assert(caller.sp() == frame_sp + (fsize-argsize), "");
295
296 frame_sp = align(hf, frame_sp, caller, bottom);
297 }
298
299 assert(hf.cb() != nullptr, "");
300 assert(hf.oop_map() != nullptr, "");
301 intptr_t* fp;
302 if (PreserveFramePointer) {
303 // we need to recreate a "real" frame pointer, pointing into the stack
304 fp = frame_sp + FKind::size(hf) - frame::sender_sp_offset;
305 } else {
306 fp = FKind::stub || FKind::native
307 // fp always points to the address above the pushed return pc. We need correct address.
308 ? frame_sp + fsize - frame::sender_sp_offset
309 // we need to re-read fp because it may be an oop and we might have fixed the frame.
310 : *(intptr_t**)(hf.sp() - 2);
311 }
312 // TODO PERF : this computes deopt state; is it necessary?
313 return frame(frame_sp, frame_sp, fp, hf.pc(), hf.cb(), hf.oop_map(), false);
314 }
315 }
316
317 inline intptr_t* ThawBase::align(const frame& hf, intptr_t* frame_sp, frame& caller, bool bottom) {
318 #ifdef _LP64
319 if (((intptr_t)frame_sp & 0xf) != 0) {
320 assert(caller.is_interpreted_frame() || (bottom && hf.compiled_frame_stack_argsize() % 2 != 0), "");
321 frame_sp--;
322 caller.set_sp(caller.sp() - 1);
323 }
324 assert(is_aligned(frame_sp, frame::frame_alignment), "");
325 #endif
326
327 return frame_sp;
328 }
329
330 inline void ThawBase::patch_pd(frame& f, const frame& caller) {
331 patch_callee_link(caller, caller.fp());
332 }
333
334 inline void ThawBase::patch_pd(frame& f, intptr_t* caller_sp) {
335 intptr_t* fp = caller_sp - frame::sender_sp_offset;
336 patch_callee_link(f, fp);
337 }
338
339 inline intptr_t* ThawBase::push_cleanup_continuation() {
340 frame enterSpecial = new_entry_frame();
341 intptr_t* sp = enterSpecial.sp();
342
343 // We only need to set the return pc. fp will be restored back in gen_continuation_enter().
344 sp[-1] = (intptr_t)ContinuationEntry::cleanup_pc();
345 return sp;
346 }
347
348 inline intptr_t* ThawBase::push_preempt_adapter() {
349 frame enterSpecial = new_entry_frame();
350 intptr_t* sp = enterSpecial.sp();
351
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1 /*
2 * Copyright (c) 2019, 2026, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
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
63 intptr_t** link_addr = link_address<FKind>(f);
64 intptr_t* sender_sp = (intptr_t*)(link_addr + 2); // f.unextended_sp() + (fsize/wordSize); //
65 address sender_pc = (address) *(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, int size_adjust) {
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 *hf.addr_at(frame::interpreter_frame_locals_offset) = locals_offset;
101 return hf;
102 } else {
103 // We need to re-read fp out of the frame because it may be an oop and we might have
104 // had a safepoint in finalize_freeze, after constructing f.
105 fp = *(intptr_t**)(f.sp() - 2);
106
107 int fsize = FKind::size(f);
108 sp = caller.unextended_sp() - fsize - size_adjust;
109 if (caller.is_interpreted_frame() && size_adjust == 0) {
110 // If the caller is interpreted, our stackargs are not supposed to overlap with it
111 // so we make more room by moving sp down by argsize
112 int argsize = FKind::stack_argsize(f);
113 sp -= argsize;
114 caller.set_sp(sp + fsize);
115 }
116
117 assert(_cont.tail()->is_in_chunk(sp), "");
118
119 return frame(sp, sp, fp, f.pc(), nullptr, nullptr, true /* on_heap */);
120 }
121 }
122
123 void FreezeBase::adjust_interpreted_frame_unextended_sp(frame& f) {
124 assert((f.at(frame::interpreter_frame_last_sp_offset) != 0) || (f.unextended_sp() == f.sp()), "");
125 intptr_t* real_unextended_sp = (intptr_t*)f.at_relative_or_null(frame::interpreter_frame_last_sp_offset);
126 if (real_unextended_sp != nullptr) {
127 f.set_unextended_sp(real_unextended_sp); // can be null at a safepoint
128 }
129 }
130
131 inline void FreezeBase::prepare_freeze_interpreted_top_frame(frame& f) {
132 assert(f.interpreter_frame_last_sp() == nullptr, "should be null for top frame");
133 f.interpreter_frame_set_last_sp(f.unextended_sp());
134 }
135
166 assert(hf.fp() > (intptr_t*)hf.at(frame::interpreter_frame_initial_sp_offset), "");
167 #ifdef ASSERT
168 if (f.interpreter_frame_method()->max_locals() > 0) {
169 assert(hf.fp() <= (intptr_t*)hf.at(frame::interpreter_frame_locals_offset), "");
170 }
171 #endif
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() - 2), "");
178
179 *(hf.sp() - 1) = (intptr_t)hf.pc();
180
181 intptr_t* fp_addr = hf.sp() - 2;
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, bool is_bottom_frame) {
187 if (caller.is_interpreted_frame()) {
188 assert(!caller.is_empty(), "");
189 patch_callee_link_relative(caller, caller.fp());
190 } else if (is_bottom_frame && caller.pc() != nullptr) {
191 assert(caller.is_compiled_frame(), "");
192 // If we're the bottom-most frame frozen in this freeze, the caller might have stayed frozen in the chunk,
193 // and its oop-containing fp fixed. We've now just overwritten it, so we must patch it back to its value
194 // as read from the chunk.
195 patch_callee_link(caller, caller.fp());
196 }
197 }
198
199 inline void FreezeBase::patch_pd_unused(intptr_t* sp) {
200 }
201
202 //////// Thaw
203
204 // Fast path
205
206 inline void ThawBase::prefetch_chunk_pd(void* start, int size) {
207 size <<= LogBytesPerWord;
208 Prefetch::read(start, size);
209 Prefetch::read(start, size - 64);
210 }
211
241 if (sp != _last_sp_from_frame) {
242 sp[-1] = (intptr_t)_top_frame.pc();
243 }
244 }
245 }
246
247 template <typename ConfigT>
248 inline void Thaw<ConfigT>::patch_caller_links(intptr_t* sp, intptr_t* bottom) {
249 // Fast path depends on !PreserveFramePointer. See can_thaw_fast().
250 assert(!PreserveFramePointer, "Frame pointers need to be fixed");
251 }
252
253 // Slow path
254
255 inline frame ThawBase::new_entry_frame() {
256 intptr_t* sp = _cont.entrySP();
257 // TODO PERF: This finds code blob and computes deopt state
258 return frame(sp, sp, _cont.entryFP(), _cont.entryPC());
259 }
260
261 template<typename FKind>
262 frame ThawBase::new_stack_frame(const frame& hf, frame& caller, bool bottom, int size_adjust) {
263 assert(FKind::is_instance(hf), "");
264 // The values in the returned frame object will be written into the callee's stack in patch.
265
266 if (FKind::interpreted) {
267 intptr_t* heap_sp = hf.unextended_sp();
268 // If caller is interpreted it already made room for the callee arguments
269 int overlap = caller.is_interpreted_frame() ? ContinuationHelper::InterpretedFrame::stack_argsize(hf) : 0;
270 const int fsize = (int)(ContinuationHelper::InterpretedFrame::frame_bottom(hf) - hf.unextended_sp() - overlap);
271 intptr_t* frame_sp = caller.unextended_sp() - fsize;
272 intptr_t* fp = frame_sp + (hf.fp() - heap_sp);
273 if ((intptr_t)fp % frame::frame_alignment != 0) {
274 fp--;
275 frame_sp--;
276 log_develop_trace(continuations)("Adding internal interpreted frame alignment");
277 }
278 DEBUG_ONLY(intptr_t* unextended_sp = fp + *hf.addr_at(frame::interpreter_frame_last_sp_offset);)
279 assert(frame_sp == unextended_sp, "");
280 caller.set_sp(fp + frame::sender_sp_offset);
281 frame f(frame_sp, frame_sp, fp, hf.pc());
282 // we need to set the locals so that the caller of new_stack_frame() can call
283 // ContinuationHelper::InterpretedFrame::frame_bottom
284 // copy relativized locals from the heap frame
285 *f.addr_at(frame::interpreter_frame_locals_offset) = *hf.addr_at(frame::interpreter_frame_locals_offset);
286 assert((intptr_t)f.fp() % frame::frame_alignment == 0, "");
287 return f;
288 } else {
289 int fsize = FKind::size(hf);
290 intptr_t* frame_sp = caller.unextended_sp() - fsize - size_adjust;
291 if (bottom || caller.is_interpreted_frame()) {
292 if (size_adjust == 0) {
293 int argsize = FKind::stack_argsize(hf);
294 frame_sp -= argsize;
295 }
296 frame_sp = align(hf, frame_sp, caller, bottom);
297 caller.set_sp(frame_sp + fsize + size_adjust);
298 }
299 assert(is_aligned(frame_sp, frame::frame_alignment), "");
300
301 assert(hf.cb() != nullptr, "");
302 assert(hf.oop_map() != nullptr, "");
303 intptr_t* fp;
304 if (PreserveFramePointer) {
305 // we need to recreate a "real" frame pointer, pointing into the stack
306 fp = frame_sp + fsize - frame::sender_sp_offset;
307 } else {
308 fp = FKind::stub || FKind::native
309 // fp always points to the address above the pushed return pc. We need correct address.
310 ? frame_sp + fsize - frame::sender_sp_offset
311 // we need to re-read fp because it may be an oop and we might have fixed the frame.
312 : *(intptr_t**)(hf.sp() - 2);
313 }
314 // TODO PERF : this computes deopt state; is it necessary?
315 return frame(frame_sp, frame_sp, fp, hf.pc(), hf.cb(), hf.oop_map(), false);
316 }
317 }
318
319 inline intptr_t* ThawBase::align(const frame& hf, intptr_t* frame_sp, frame& caller, bool bottom) {
320 #ifdef _LP64
321 if (((intptr_t)frame_sp & 0xf) != 0) {
322 assert(caller.is_interpreted_frame() || (bottom && hf.compiled_frame_stack_argsize() % 2 != 0), "");
323 frame_sp--;
324 }
325 assert(is_aligned(frame_sp, frame::frame_alignment), "");
326 #endif
327 return frame_sp;
328 }
329
330 inline void ThawBase::patch_pd(frame& f, const frame& caller) {
331 if (caller.is_interpreted_frame() || PreserveFramePointer) {
332 patch_callee_link(caller, caller.fp());
333 }
334 }
335
336 inline void ThawBase::patch_pd(frame& f, intptr_t* caller_sp) {
337 intptr_t* fp = caller_sp - frame::sender_sp_offset;
338 patch_callee_link(f, fp);
339 }
340
341 inline intptr_t* ThawBase::push_cleanup_continuation() {
342 frame enterSpecial = new_entry_frame();
343 intptr_t* sp = enterSpecial.sp();
344
345 // We only need to set the return pc. fp will be restored back in gen_continuation_enter().
346 sp[-1] = (intptr_t)ContinuationEntry::cleanup_pc();
347 return sp;
348 }
349
350 inline intptr_t* ThawBase::push_preempt_adapter() {
351 frame enterSpecial = new_entry_frame();
352 intptr_t* sp = enterSpecial.sp();
353
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