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