1 /*
2 * Copyright (c) 2019, 2023, 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.
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23 */
24
25 #ifndef CPU_PPC_CONTINUATION_PPC_INLINE_HPP
26 #define CPU_PPC_CONTINUATION_PPC_INLINE_HPP
27
28 #include "oops/stackChunkOop.inline.hpp"
29 #include "runtime/frame.hpp"
30 #include "runtime/frame.inline.hpp"
31
32 inline void patch_callee_link(const frame& f, intptr_t* fp) {
33 *ContinuationHelper::Frame::callee_link_address(f) = fp;
34 }
35
36 inline void patch_callee_link_relative(const frame& f, intptr_t* fp) {
37 intptr_t* la = (intptr_t*)ContinuationHelper::Frame::callee_link_address(f);
38 intptr_t new_value = fp - la;
39 *la = new_value;
40 }
41
42 ////// Freeze
43
44 // Fast path
45
46 inline void FreezeBase::patch_stack_pd(intptr_t* frame_sp, intptr_t* heap_sp) {
47 // Nothing to do. The backchain is reconstructed when thawing (see Thaw<ConfigT>::patch_caller_links())
48 }
49
50 // Slow path
51
52 template<typename FKind>
53 inline frame FreezeBase::sender(const frame& f) {
54 assert(FKind::is_instance(f), "");
55 if (FKind::interpreted) {
56 return frame(f.sender_sp(), f.sender_pc(), f.interpreter_frame_sender_sp());
57 }
58
59 intptr_t* sender_sp = f.sender_sp();
60 address sender_pc = f.sender_pc();
61 assert(sender_sp != f.sp(), "must have changed");
62
63 int slot = 0;
64 CodeBlob* sender_cb = CodeCache::find_blob_and_oopmap(sender_pc, slot);
65 return sender_cb != nullptr
66 ? frame(sender_sp, sender_sp, nullptr, sender_pc, sender_cb, slot == -1 ? nullptr : sender_cb->oop_map_for_slot(slot, sender_pc))
67 : frame(sender_sp, sender_pc, sender_sp);
68 }
69
70 void FreezeBase::adjust_interpreted_frame_unextended_sp(frame& f) {
71 // nothing to do
72 }
73
74 inline void FreezeBase::prepare_freeze_interpreted_top_frame(const frame& f) {
75 Unimplemented();
76 }
77
78 inline void FreezeBase::relativize_interpreted_frame_metadata(const frame& f, const frame& hf) {
79 intptr_t* vfp = f.fp();
80 intptr_t* hfp = hf.fp();
81 assert(f.fp() > (intptr_t*)f.interpreter_frame_esp(), "");
82
83 // There is alignment padding between vfp and f's locals array in the original
84 // frame, because we freeze the padding (see recurse_freeze_interpreted_frame)
85 // in order to keep the same relativized locals pointer, we don't need to change it here.
86
87 // Make sure that monitors is already relativized.
88 assert(hf.at_absolute(ijava_idx(monitors)) <= -(frame::ijava_state_size / wordSize), "");
89
90 // Make sure that esp is already relativized.
91 assert(hf.at_absolute(ijava_idx(esp)) <= hf.at_absolute(ijava_idx(monitors)), "");
92
93 // top_frame_sp is already relativized
94
95 // hfp == hf.sp() + (f.fp() - f.sp()) is not true on ppc because the stack frame has room for
96 // the maximal expression stack and the expression stack in the heap frame is trimmed.
97 assert(hf.fp() == hf.interpreter_frame_esp() + (f.fp() - f.interpreter_frame_esp()), "");
98 assert(hf.fp() <= (intptr_t*)hf.at(ijava_idx(locals)), "");
99 }
100
101 inline void FreezeBase::set_top_frame_metadata_pd(const frame& hf) {
102 stackChunkOop chunk = _cont.tail();
103 assert(chunk->is_in_chunk(hf.sp()), "hf.sp()=" PTR_FORMAT, p2i(hf.sp()));
104
105 hf.own_abi()->lr = (uint64_t)hf.pc();
106 if (hf.is_interpreted_frame()) {
107 patch_callee_link_relative(hf, hf.fp());
108 }
109 #ifdef ASSERT
110 else {
111 // See also FreezeBase::patch_pd()
112 patch_callee_link(hf, (intptr_t*)badAddress);
113 }
114 #endif
115 }
116
117 //
118 // Heap frames differ from stack frames in the following aspects
119 //
120 // - they are just word aligned
121 // - the unextended sp of interpreted frames is set such that
122 // unextended sp + frame::metadata_words_at_top + 1 points to the last call parameter
123 // (the comment at the file end explains the unextended sp for interpreted frames on the stack)
124 //
125 // The difference in respect to the unextended sp is required to comply with shared code.
126 // Furthermore fast frozen and compiled frames have invalid back links (see
127 // Thaw<ConfigT>::patch_caller_links() and FreezeBase::patch_pd())
128 //
129 // === New Interpreted Frame ==========================================================================================
130 //
131 // ### Interpreted Caller: Overlap new frame with Caller
132 //
133 // Caller on entry New frame with resized Caller
134 //
135 // | frame::java_abi | | |
136 // | |<- FP of caller | Caller's SP |<- FP of caller
137 // ========================== ==========================
138 // | ijava_state | | ijava_state |
139 // | | | |
140 // |------------------------| ----- |------------------------|
141 // | P0 | ^ | L0 aka P0 |
142 // | : | | | : : |
143 // | Pn |<- unext. SP | | : Pn |<- unext. SP
144 // |------------------------| + metadata overlap | : | + metadata
145 // | frame::java_abi | | | Lm |
146 // | (metadata_words_at_top)|<- SP == unext. SP v |------------------------|<- unextended SP of caller (1)
147 // ========================== of caller ----- | frame::java_abi |
148 // | (metadata_words_at_top)|<- new SP of caller / FP of new frame
149 // overlap = stack_argsize(f) ========================== ^
150 // + frame::metadata_words_at_top | ijava_state | |
151 // | | |
152 // Where f is the frame to be relocated on the heap. |------------------------| |
153 // See also StackChunkFrameStream::frame_size(). | Expressions | FP - esp of f
154 // | P0 | |
155 // | : | |
156 // | Growth | | Pi | v
157 // v v |------------------------| ---
158 // | frame::java_abi |
159 // | (metadata_words_at_top)|<- unextended SP /
160 // ========================== SP of new frame
161 // ### Compiled Caller: No Overlap
162 //
163 // The caller is resized to accomodate the callee's locals and abi but there is _no_ overlap with
164 // the original caller frame.
165 //
166 // Caller on entry New frame with resized Caller
167 //
168 // | frame::java_abi | | |
169 // | (metadata_words_at_top)|<- FP of caller | Caller's SP |<- FP of caller
170 // ========================== ==========================
171 // | | | |
172 // | | | |
173 // |------------------------| |------------------------|
174 // | frame::java_abi | | frame::java_abi |
175 // | (metadata_words_at_top)|<- SP == unext. SP | (metadata_words_at_top)|<- unext. SP of caller
176 // ========================== of caller |------------------------|
177 // | L0 aka P0 |
178 // | : : |
179 // | : Pn |
180 // overlap = 0 | Lm |
181 // |------------------------|
182 // f is the frame to be relocated on the heap | frame::java_abi |
183 // | (metadata_words_at_top)|<- new SP of caller / FP of new frame
184 // ========================== ^
185 // | ijava_state | |
186 // | Growth | | | |
187 // v v |------------------------| |
188 // | Expressions | FP - esp of f
189 // | P0 | |
190 // | : | |
191 // | Pi | v
192 // |------------------------| ---
193 // | frame::java_abi |
194 // | (metadata_words_at_top)|<- unextended SP /
195 // ========================== SP of new frame
196 //
197 // (1) Caller's unextended SP is preserved in callee's frame::ijava_state::sender_sp
198 // (See ContinuationHelper::InterpretedFrame::patch_sender_sp). This is required
199 // by StackChunkFrameStream<frame_kind>::next_for_interpreter_frame().
200 //
201 // === New Compiled Frame =============================================================================================
202 //
203 // ### Interpreted Caller: No Overlap
204 //
205 // The caller is resized to accomodate the callee's stack arguments and abi but there is _no_ overlap with
206 // the original caller frame.
207 //
208 // Note: a new ABI is added to the caller even if there are no stackargs.
209 // This is necessary to comply with shared code.
210 //
211 // Caller on entry New frame with resized Caller
212 //
213 // | frame::java_abi | | frame::java_abi |
214 // | (metadata_words_at_top)|<- FP of caller | (metadata_words_at_top)|<- FP of caller
215 // ========================== ==========================
216 // | ijava_state | | ijava_state |
217 // | | | |
218 // |------------------------| |------------------------|
219 // | P0 | | P0 |
220 // | : | | : |
221 // | Pn |<- unext. SP | Pn |<- unext. SP
222 // |------------------------| + metadata |------------------------| + metadata
223 // | frame::java_abi | | frame::java_abi |
224 // | (metadata_words_at_top)|<- SP == unext. SP | (metadata_words_at_top)|<- unextended SP of caller (1)
225 // ========================== of caller |------------------------|
226 // | Stack Args |
227 // overlap = 0 | (if any) |
228 // |------------------------|
229 // f is the frame to be relocated on the heap | frame::java_abi |
230 // | (metadata_words_at_top)|<- new SP of caller / FP of new frame
231 // ==========================
232 // | |
233 // | Growth | | |
234 // v v |------------------------|
235 // | frame::java_abi |
236 // | (metadata_words_at_top)|<- SP == unext. SP of new frame
237 // ==========================
238 //
239 // ### Compiled Caller: Stackargs + ABI Overlap
240 //
241 // Caller on entry New frame with resized Caller
242 //
243 // | frame::java_abi | | frame::java_abi |
244 // | (metadata_words_at_top)|<- FP of caller | (metadata_words_at_top)|<- FP of caller
245 // ========================== ==========================
246 // | | | |
247 // | | | |
248 // |------------------------| ----- |------------------------|
249 // | Stack Args | ^ | Stack Args |
250 // | (if any) | | | (if any) |
251 // |------------------------| overlap |------------------------|
252 // | frame::java_abi | | | frame::java_abi |
253 // | (metadata_words_at_top)|<- SP == unext. SP v | (metadata_words_at_top)|<- SP == unext. SP of caller
254 // ========================== of caller ----- ========================== / FP of new frame
255 // | |
256 // overlap = stack_argsize(f) | |
257 // + frame::metadata_words_at_top |------------------------|
258 // | frame::java_abi |
259 // Where f is the frame to be relocated on the heap. | (metadata_words_at_top)|<- SP == unext. SP of new frame
260 // See also StackChunkFrameStream::frame_size(). ==========================
261 //
262 template<typename FKind>
263 frame FreezeBase::new_heap_frame(frame& f, frame& caller) {
264 assert(FKind::is_instance(f), "");
265
266 intptr_t *sp, *fp;
267 if (FKind::interpreted) {
268 intptr_t locals_offset = *f.addr_at(ijava_idx(locals));
269 // If the caller.is_empty(), i.e. we're freezing into an empty chunk, then we set
270 // the chunk's argsize in finalize_freeze and make room for it above the unextended_sp
271 // See also comment on StackChunkFrameStream<frame_kind>::interpreter_frame_size()
272 int overlap =
273 (caller.is_interpreted_frame() || caller.is_empty())
274 ? ContinuationHelper::InterpretedFrame::stack_argsize(f) + frame::metadata_words_at_top
275 : 0;
276 fp = caller.unextended_sp() - 1 - locals_offset + overlap;
277 // esp points one slot below the last argument
278 intptr_t* x86_64_like_unextended_sp = f.interpreter_frame_esp() + 1 - frame::metadata_words_at_top;
279 sp = fp - (f.fp() - x86_64_like_unextended_sp);
280
281 assert (sp <= fp && (fp <= caller.unextended_sp() || caller.is_interpreted_frame()),
282 "sp=" PTR_FORMAT " fp=" PTR_FORMAT " caller.unextended_sp()=" PTR_FORMAT " caller.is_interpreted_frame()=%d",
283 p2i(sp), p2i(fp), p2i(caller.unextended_sp()), caller.is_interpreted_frame());
284 caller.set_sp(fp);
285
286 assert(_cont.tail()->is_in_chunk(sp), "");
287
288 frame hf(sp, sp, fp, f.pc(), nullptr, nullptr, true /* on_heap */);
289 // frame_top() and frame_bottom() read these before relativize_interpreted_frame_metadata() is called
290 *hf.addr_at(ijava_idx(locals)) = locals_offset;
291 *hf.addr_at(ijava_idx(esp)) = f.interpreter_frame_esp() - f.fp();
292 return hf;
293 } else {
294 int fsize = FKind::size(f);
295 sp = caller.unextended_sp() - fsize;
296 if (caller.is_interpreted_frame()) {
297 // If the caller is interpreted, our stackargs are not supposed to overlap with it
298 // so we make more room by moving sp down by argsize
299 int argsize = FKind::stack_argsize(f);
300 sp -= argsize + frame::metadata_words_at_top;
301 }
302 fp = sp + fsize;
303 caller.set_sp(fp);
304
305 assert(_cont.tail()->is_in_chunk(sp), "");
306
307 return frame(sp, sp, fp, f.pc(), nullptr, nullptr, true /* on_heap */);
308 }
309 }
310
311 inline void FreezeBase::patch_pd(frame& hf, const frame& caller) {
312 if (caller.is_interpreted_frame()) {
313 assert(!caller.is_empty(), "");
314 patch_callee_link_relative(caller, caller.fp());
315 }
316 #ifdef ASSERT
317 else {
318 // For compiled frames the back link is actually redundant. It gets computed
319 // as unextended_sp + frame_size.
320
321 // Note the difference on x86_64: the link is not made relative if the caller
322 // is a compiled frame because there rbp is used as a non-volatile register by
323 // c1/c2 so it could be a computed value local to the caller.
324
325 // See also:
326 // - FreezeBase::set_top_frame_metadata_pd
327 // - StackChunkFrameStream<frame_kind>::fp()
328 // - UseContinuationFastPath: compiled frames are copied in a batch w/o patching the back link.
329 // The backlinks are restored when thawing (see Thaw<ConfigT>::patch_caller_links())
330 patch_callee_link(hf, (intptr_t*)badAddress);
331 }
332 #endif
333 }
334
335 //////// Thaw
336
337 // Fast path
338
339 inline void ThawBase::prefetch_chunk_pd(void* start, int size) {
340 size <<= LogBytesPerWord;
341 Prefetch::read(start, size);
342 Prefetch::read(start, size - 64);
343 }
344
345 // Set back chain links of fast thawed frames such that *sp == callers_sp.
346 // See https://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi.html#STACK
347 template <typename ConfigT>
348 inline void Thaw<ConfigT>::patch_caller_links(intptr_t* sp, intptr_t* bottom) {
349 for (intptr_t* callers_sp; sp < bottom; sp = callers_sp) {
350 address pc = (address)((frame::java_abi*) sp)->lr;
351 assert(pc != nullptr, "");
352 // see ThawBase::patch_return() which gets called just before
353 bool is_entry_frame = pc == StubRoutines::cont_returnBarrier() || pc == _cont.entryPC();
354 if (is_entry_frame) {
355 callers_sp = _cont.entryFP();
356 } else {
357 CodeBlob* cb = CodeCache::find_blob_fast(pc);
358 callers_sp = sp + cb->frame_size();
359 }
360 // set the back link
361 ((frame::java_abi*) sp)->callers_sp = (intptr_t) callers_sp;
362 }
363 }
364
365 // Slow path
366
367 inline frame ThawBase::new_entry_frame() {
368 intptr_t* sp = _cont.entrySP();
369 return frame(sp, _cont.entryPC(), sp, _cont.entryFP());
370 }
371
372 // === New Interpreted Frame ================================================================================================================
373 //
374 // ### Non-Interpreted Caller (compiled, enterSpecial): No Overlap
375 //
376 // Heap Frame `hf` `hf` gets copied to stack _without_ overlapping the caller
377 //
378 // | | Non-Interpreted | |
379 // | |<- bottom Caller |----------------------|
380 // |----------------------| ^ | frame::java_abi |<- unextended SP
381 // | L0 aka P0 | | --- ========================
382 // | : : | | ^ | L0 aka P0 |
383 // | : Pn | | | | : : | Parameters do
384 // | : | | | | : Pn | not overlap with
385 // | Lm | | | | : | caller!
386 // |----------------------| `fsize` | | : |
387 // | frame::java_abi | | | : |
388 // ======================== | `fsize` + padding | Lm |
389 // | | | |----------------------|
390 // | ijava_state | | | | Opt. Align. Padding |
391 // | | | | |----------------------|
392 // |----------------------| | | | frame::java_abi |<- new SP of caller
393 // | L0 aka P0 | | | ======================== / FP of new frame
394 // | : : | | | | | (aligned)
395 // | : Pn |<- unext. SP + metadata | | ijava_state |
396 // | : | | | | |
397 // | Lm | | | |----------------------|
398 // |----------------------| v | | P0 |
399 // | frame::java_abi |<- SP / unextended SP | | : |
400 // ======================== | | Pi |<- unextended SP + metadata
401 // | |----------------------|
402 // | Growth | v | frame::java_abi |<- unextended SP / SP of new frame
403 // v v --- ======================== (not yet aligned(1))
404 //
405 //
406 // ### Interpreted Caller: Overlap with Caller
407 //
408 // Caller New frame with resized/aligned Caller
409 //
410 // | | | |
411 // | ijava_state | | ijava_state |
412 // |----------------------| |----------------------|
413 // | non param. expr. | bottom | non param. expr. |
414 // | - - - - - - - - - - | --- ^ | - - - - - - - - - - |
415 // | P0 | ^ | | L0 aka P0 |
416 // | : | | | | : : |
417 // | Pn |<- unextended SP overlap | | : Pn |<- unextended SP
418 // |----------------------| + metadata_words_at_top | | | : | + metadata_words_at_top
419 // | frame::java_abi |<- unextended SP v | | : | (unaligned)
420 // ======================== / SP of new frame --- | | : | of caller
421 // (not yet aligned(1)) | | Lm |
422 // `fsize` |----------------------|
423 // overlap = stack_argsize(hf) + padding| Opt. Align. Padding |
424 // + frame::metadata_words_at_top | |----------------------|
425 // | | frame::java_abi |<- new SP of caller
426 // | ======================== / FP of new frame
427 // | | | (aligned)
428 // | Growth | | | ijava_state |
429 // v v | | |
430 // | |----------------------|
431 // | | P0 |
432 // | | : |
433 // | | Pi |<- unextended SP
434 // | |----------------------| + metadata_words_at_top
435 // v | frame::java_abi |<- unextended SP / SP of new frame
436 // --- ======================== (not yet aligned(1))
437 //
438 //
439 // (1) The SP / unextended SP of the new interpreted frame is not aligned. It
440 // gets aligned when its callee is pushed on stack or in finish_thaw() if
441 // it is the top frame. This allows addressing parameters: unextended SP + metadata_words_at_top
442 //
443 // (2) If caller is interpreted then its ijava_state::top_frame_sp will be used as sender sp
444 // of the new frame (see ContinuationHelper::InterpretedFrame::patch_sender_sp() and diagram at the end of this file)
445 //
446 // (3) The size of alignment padding required when thawing frames is accounted for
447 // in FreezeBase::_align_size.
448 //
449 // === New Compiled Frame ===================================================================================================================
450 //
451 // Compiled Caller Interpreted Caller
452 //
453 // - stackargs+abi overlap with caller - gets resized for stackargs
454 // - no alignment padding - SP gets aligned
455 // - no overlap with orig.
456 // caller
457 // O C
458 // r a | | | |
459 // i l | | | |
460 // g l |----------------------| | |
461 // i e | Stack Args | | |
462 // n r | (if any) | |----------------------|
463 // a |----------------------| | frame::java_abi |
464 // l | frame::java_abi |<- unext. SP / SP | (unused) |<- unal.unext.SP
465 // - - - ======================== - - - - - - - - - - |----------------------|- - - - - - - - - - - - - - - - - - - - - - - - - - - -
466 // N | | | Opt. Align. Padding |
467 // e | | |----------------------|
468 // w |----------------------| | Stack Args |
469 // | frame::java_abi |<- unext. SP / SP | (if any) |
470 // F ======================== |----------------------|
471 // r | frame::java_abi |<- caller's SP
472 // a ======================== / new frame's FP
473 // m | | (aligned)
474 // e | |
475 // |----------------------|
476 // | frame::java_abi |<- unext. SP / SP
477 // ========================
478 //
479 // If the new frame is at the bottom just above the ContinuationEntry frame then the stackargs
480 // don't overlap the caller either even though it is compiled because the size is not
481 // limited/known. In contrast to the interpreted caller case the abi overlaps with the caller
482 // if there are no stackargs. This is to comply with shared code (see e.g. StackChunkFrameStream::frame_size())
483 //
484 template<typename FKind> frame ThawBase::new_stack_frame(const frame& hf, frame& caller, bool bottom) {
485 assert(FKind::is_instance(hf), "");
486
487 assert(is_aligned(caller.fp(), frame::frame_alignment), "");
488 assert(is_aligned(caller.sp(), frame::frame_alignment), "");
489 if (FKind::interpreted) {
490 // Note: we have to overlap with the caller, at least if it is interpreted, to match the
491 // max_thawing_size calculation during freeze. See also comment above.
492 intptr_t* heap_sp = hf.unextended_sp();
493 const int fsize = ContinuationHelper::InterpretedFrame::frame_bottom(hf) - hf.unextended_sp();
494 const int overlap = !caller.is_interpreted_frame() ? 0
495 : ContinuationHelper::InterpretedFrame::stack_argsize(hf) + frame::metadata_words_at_top;
496 intptr_t* frame_sp = caller.unextended_sp() + overlap - fsize;
497 intptr_t* fp = frame_sp + (hf.fp() - heap_sp);
498 // align fp
499 int padding = fp - align_down(fp, frame::frame_alignment);
500 fp -= padding;
501 // alignment of sp is done by callee or in finish_thaw()
502 frame_sp -= padding;
503
504 // On ppc esp points to the next free slot on the expression stack and sp + metadata points to the last parameter
505 DEBUG_ONLY(intptr_t* esp = fp + *hf.addr_at(ijava_idx(esp));)
506 assert(frame_sp + frame::metadata_words_at_top == esp+1, " frame_sp=" PTR_FORMAT " esp=" PTR_FORMAT, p2i(frame_sp), p2i(esp));
507 caller.set_sp(fp);
508 frame f(frame_sp, hf.pc(), frame_sp, fp);
509 // we need to set the locals so that the caller of new_stack_frame() can call
510 // ContinuationHelper::InterpretedFrame::frame_bottom
511 // copy relativized locals from the heap frame
512 *f.addr_at(ijava_idx(locals)) = *hf.addr_at(ijava_idx(locals));
513
514 return f;
515 } else {
516 int fsize = FKind::size(hf);
517 int argsize = hf.compiled_frame_stack_argsize();
518 intptr_t* frame_sp = caller.sp() - fsize;
519
520 if ((bottom && argsize > 0) || caller.is_interpreted_frame()) {
521 frame_sp -= argsize + frame::metadata_words_at_top;
522 frame_sp = align_down(frame_sp, frame::alignment_in_bytes);
523 caller.set_sp(frame_sp + fsize);
524 }
525
526 assert(hf.cb() != nullptr, "");
527 assert(hf.oop_map() != nullptr, "");
528 intptr_t* fp = frame_sp + fsize;
529 return frame(frame_sp, frame_sp, fp, hf.pc(), hf.cb(), hf.oop_map(), false);
530 }
531 }
532
533 inline intptr_t* ThawBase::align(const frame& hf, intptr_t* frame_sp, frame& caller, bool bottom) {
534 // Unused. Alignment is done directly in new_stack_frame() / finish_thaw().
535 return nullptr;
536 }
537
538 inline void ThawBase::derelativize_interpreted_frame_metadata(const frame& hf, const frame& f) {
539 intptr_t* vfp = f.fp();
540
541 // Make sure that monitors is still relativized.
542 assert(f.at_absolute(ijava_idx(monitors)) <= -(frame::ijava_state_size / wordSize), "");
543
544 // Make sure that esp is still relativized.
545 assert(f.at_absolute(ijava_idx(esp)) <= f.at_absolute(ijava_idx(monitors)), "");
546
547 // Keep top_frame_sp relativized.
548 }
549
550 inline intptr_t* ThawBase::push_preempt_rerun_adapter(frame top, bool is_interpreted_frame) {
551 Unimplemented();
552 return nullptr;
553 }
554
555 inline intptr_t* ThawBase::push_preempt_monitorenter_redo(stackChunkOop chunk) {
556 Unimplemented();
557 return nullptr;
558 }
559
560 inline void ThawBase::patch_pd(frame& f, const frame& caller) {
561 patch_callee_link(caller, caller.fp());
562 // Prevent assertion if f gets deoptimized right away before it's fully initialized
563 f.mark_not_fully_initialized();
564 }
565
566 inline void ThawBase::patch_pd(frame& f, intptr_t* caller_sp) {
567 Unimplemented();
568 }
569
570 //
571 // Interpreter Calling Procedure on PPC
572 //
573 // Caller Resized Caller before the Call New Callee Frame
574 //
575 // - SP/FP are 16 byte aligned. - The unused part of the expression stack - The caller's original SP is passed as
576 // Padding is added as necessary. is removed sender SP (in R21_sender_SP) also by
577 // - SP is _not_ used as esp - Slots for the callee's nonparameter locals compiled callers. It is saved in the
578 // (expression stack pointer) are added. ijava_state::sender_sp slot and
579 // - Has reserved slots for the - The large ABI is replaced with a minimal restored when returning.
580 // maximal expression stack ABI. This removes a c2i extension if there
581 // - Has a larger ABI section on - The original SP was saved in is one.
582 // top that is required to call ijava_state::top_frame_sp slot. - ijava_state::sender_sp will be set
583 // C++ code From there it is restored as SP _after_ as the caller's unextended sp when
584 // returning from a call. This reverts the iterating stack frames
585 // resizing described above. It is also (see frame::unextended_sp() and
586 // required to undo potential i2c extensions frame::sender_for_interpreter_frame())
587 // if the calle should be compiled.
588 // - Note that unextended SP < SP
589 // is possible on ppc.
590 //
591 // | | | | | |
592 // | (frame::java_abi) | | (frame::java_abi) | | (frame::java_abi) |
593 // | 4 words | | 4 words | | 4 words |
594 // | Caller's SP |<- FP of caller | Caller's SP |<- FP of caller | Caller's SP |<- FP of caller
595 // ======================== (aligned) ======================== ========================
596 // | frame:: | | frame:: | | frame:: |
597 // | ijava_state | | ijava_state | | ijava_state |
598 // | | | | | |
599 // |----------------------| |----------------------| |----------------------|
600 // | P0 | | L0 aka P0 | | L0 aka P0 |
601 // | | | : | | : |
602 // | Pn | | : Pn | | : Pn |
603 // |----------------------| | : | | : |
604 // | | | Lm | | Lm |
605 // | Reserved Expr. Stack | |----------------------| |----------------------|
606 // | | | Opt. Alignm. Padding | | Opt. Alignm. Padding |
607 // | |<- ConstMethod |----------------------| |----------------------|
608 // |----------------------| ::_max_stack | | | |
609 // | Opt. Alignm. Padding | | (frame::java_abi) | | (frame::java_abi) |
610 // |----------------------| | 4 words | | 4 words |
611 // | Large ABI | | Caller's SP |<- new SP of caller | Caller's SP |<- SP of caller /
612 // | for C++ calls | ======================== (aligned) ======================== FP of callee
613 // | (frame:: | | frame:: | (aligned)
614 // | native_abi_reg_args)| | ijava_state |
615 // | | | |
616 // | | |----------------------|
617 // | | | |
618 // | Caller's SP |<- SP of caller <- unextended SP | Reserved Expr. Stack |<- unextended SP
619 // ======================== (aligned) of caller | | of caller
620 // (aligned) | |
621 // | |
622 // | |
623 // | |
624 // | |<- ConstMethod
625 // |----------------------| ::_max_stack
626 // Resize Caller Push new Callee Frame | Opt. Alignm. Padding |
627 // --------------------> ------------------------> |----------------------|
628 // (ABI, expressions, locals) | Large ABI |
629 // | for C++ calls |
630 // | (frame:: |
631 // | native_abi_reg_args)|
632 // | Growth | | |
633 // v v | |
634 // | |
635 // | Caller's SP |<- SP of callee
636 // ======================== (aligned)
637 //
638 //
639 #endif // CPU_PPC_CONTINUATION_PPC_INLINE_HPP