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jdk/src/hotspot/cpu/ppc/continuationFreezeThaw_ppc.inline.hpp
Sergey Bylokhov a6462d641c 8374316: Update copyright year to 2025 for hotspot in files where it was missed 
Reviewed-by: kbarrett
2025-12-30 12:08:36 +00:00

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/*
* Copyright (c) 2019, 2025, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#ifndef CPU_PPC_CONTINUATION_PPC_INLINE_HPP
#define CPU_PPC_CONTINUATION_PPC_INLINE_HPP
#include "oops/stackChunkOop.inline.hpp"
#include "runtime/frame.hpp"
#include "runtime/frame.inline.hpp"
inline void patch_callee_link(const frame& f, intptr_t* fp) {
*ContinuationHelper::Frame::callee_link_address(f) = fp;
}
inline void patch_callee_link_relative(const frame& f, intptr_t* fp) {
intptr_t* la = (intptr_t*)ContinuationHelper::Frame::callee_link_address(f);
intptr_t new_value = fp - la;
*la = new_value;
}
////// Freeze
// Fast path
inline void FreezeBase::patch_stack_pd(intptr_t* frame_sp, intptr_t* heap_sp) {
// Nothing to do. The backchain is reconstructed when thawing (see Thaw<ConfigT>::patch_caller_links())
}
// Slow path
template<typename FKind>
inline frame FreezeBase::sender(const frame& f) {
assert(FKind::is_instance(f), "");
if (FKind::interpreted) {
return frame(f.sender_sp(), f.sender_pc(), f.interpreter_frame_sender_sp());
}
intptr_t* sender_sp = f.sender_sp();
address sender_pc = f.sender_pc();
assert(sender_sp != f.sp(), "must have changed");
int slot = 0;
CodeBlob* sender_cb = CodeCache::find_blob_and_oopmap(sender_pc, slot);
return sender_cb != nullptr
? frame(sender_sp, sender_sp, nullptr, sender_pc, sender_cb, slot == -1 ? nullptr : sender_cb->oop_map_for_slot(slot, sender_pc))
: frame(sender_sp, sender_pc, sender_sp);
}
void FreezeBase::adjust_interpreted_frame_unextended_sp(frame& f) {
// nothing to do
}
inline void FreezeBase::prepare_freeze_interpreted_top_frame(frame& f) {
// Nothing to do. We don't save a last sp since we cannot use sp as esp.
// Instead the top frame is trimmed when making an i2i call. The original
// top_frame_sp is set when the frame is pushed (see generate_fixed_frame()).
// An interpreter top frame that was just thawed is resized to top_frame_sp by the
// resume adapter (see generate_cont_resume_interpreter_adapter()). So the assertion is
// false, if we freeze again right after thawing as we do when redoing a vm call wasn't
// successful.
assert(_thread->interp_redoing_vm_call() ||
((intptr_t*)f.at_relative(ijava_idx(top_frame_sp)) == f.unextended_sp()),
"top_frame_sp:" PTR_FORMAT " usp:" PTR_FORMAT, f.at_relative(ijava_idx(top_frame_sp)), p2i(f.unextended_sp()));
}
inline void FreezeBase::relativize_interpreted_frame_metadata(const frame& f, const frame& hf) {
intptr_t* vfp = f.fp();
intptr_t* hfp = hf.fp();
assert(f.fp() > (intptr_t*)f.interpreter_frame_esp(), "");
// There is alignment padding between vfp and f's locals array in the original
// frame, because we freeze the padding (see recurse_freeze_interpreted_frame)
// in order to keep the same relativized locals pointer, we don't need to change it here.
// Make sure that monitors is already relativized.
assert(hf.at_absolute(ijava_idx(monitors)) <= -(frame::ijava_state_size / wordSize), "");
// Make sure that esp is already relativized.
assert(hf.at_absolute(ijava_idx(esp)) <= hf.at_absolute(ijava_idx(monitors)), "");
// top_frame_sp is already relativized
// hfp == hf.sp() + (f.fp() - f.sp()) is not true on ppc because the stack frame has room for
// the maximal expression stack and the expression stack in the heap frame is trimmed.
assert(hf.fp() == hf.interpreter_frame_esp() + (f.fp() - f.interpreter_frame_esp()), "");
assert(hf.fp() <= (intptr_t*)hf.at(ijava_idx(locals)), "");
}
inline void FreezeBase::set_top_frame_metadata_pd(const frame& hf) {
stackChunkOop chunk = _cont.tail();
assert(chunk->is_in_chunk(hf.sp()), "hf.sp()=" PTR_FORMAT, p2i(hf.sp()));
hf.own_abi()->lr = (uint64_t)hf.pc();
if (hf.is_interpreted_frame()) {
patch_callee_link_relative(hf, hf.fp());
}
#ifdef ASSERT
else {
// See also FreezeBase::patch_pd()
patch_callee_link(hf, (intptr_t*)badAddress);
}
#endif
}
//
// Heap frames differ from stack frames in the following aspects
//
// - they are just word aligned
// - the unextended sp of interpreted frames is set such that
// unextended sp + frame::metadata_words_at_top + 1 points to the last call parameter
// (the comment at the file end explains the unextended sp for interpreted frames on the stack)
//
// The difference in respect to the unextended sp is required to comply with shared code.
// Furthermore fast frozen and compiled frames have invalid back links (see
// Thaw<ConfigT>::patch_caller_links() and FreezeBase::patch_pd())
//
// === New Interpreted Frame ==========================================================================================
//
// ### Interpreted Caller: Overlap new frame with Caller
//
// Caller on entry New frame with resized Caller
//
// | frame::java_abi | | |
// | |<- FP of caller | Caller's SP |<- FP of caller
// ========================== ==========================
// | ijava_state | | ijava_state |
// | | | |
// |------------------------| ----- |------------------------|
// | P0 | ^ | L0 aka P0 |
// | : | | | : : |
// | Pn |<- unext. SP | | : Pn |<- unext. SP
// |------------------------| + metadata overlap | : | + metadata
// | frame::java_abi | | | Lm |
// | (metadata_words_at_top)|<- SP == unext. SP v |------------------------|<- unextended SP of caller (1)
// ========================== of caller ----- | frame::java_abi |
// | (metadata_words_at_top)|<- new SP of caller / FP of new frame
// overlap = stack_argsize(f) ========================== ^
// + frame::metadata_words_at_top | ijava_state | |
// | | |
// Where f is the frame to be relocated on the heap. |------------------------| |
// See also StackChunkFrameStream::frame_size(). | Expressions | FP - esp of f
// | P0 | |
// | : | |
// | Growth | | Pi | v
// v v |------------------------| ---
// | frame::java_abi |
// | (metadata_words_at_top)|<- unextended SP /
// ========================== SP of new frame
// ### Compiled Caller: No Overlap
//
// The caller is resized to accomodate the callee's locals and abi but there is _no_ overlap with
// the original caller frame.
//
// Caller on entry New frame with resized Caller
//
// | frame::java_abi | | |
// | (metadata_words_at_top)|<- FP of caller | Caller's SP |<- FP of caller
// ========================== ==========================
// | | | |
// | | | |
// |------------------------| |------------------------|
// | frame::java_abi | | frame::java_abi |
// | (metadata_words_at_top)|<- SP == unext. SP | (metadata_words_at_top)|<- unext. SP of caller
// ========================== of caller |------------------------|
// | L0 aka P0 |
// | : : |
// | : Pn |
// overlap = 0 | Lm |
// |------------------------|
// f is the frame to be relocated on the heap | frame::java_abi |
// | (metadata_words_at_top)|<- new SP of caller / FP of new frame
// ========================== ^
// | ijava_state | |
// | Growth | | | |
// v v |------------------------| |
// | Expressions | FP - esp of f
// | P0 | |
// | : | |
// | Pi | v
// |------------------------| ---
// | frame::java_abi |
// | (metadata_words_at_top)|<- unextended SP /
// ========================== SP of new frame
//
// (1) Caller's unextended SP is preserved in callee's frame::ijava_state::sender_sp
// (See ContinuationHelper::InterpretedFrame::patch_sender_sp). This is required
// by StackChunkFrameStream<frame_kind>::next_for_interpreter_frame().
//
// === New Compiled Frame =============================================================================================
//
// ### Interpreted Caller: No Overlap
//
// The caller is resized to accomodate the callee's stack arguments and abi but there is _no_ overlap with
// the original caller frame.
//
// Note: a new ABI is added to the caller even if there are no stackargs.
// This is necessary to comply with shared code.
//
// Caller on entry New frame with resized Caller
//
// | frame::java_abi | | frame::java_abi |
// | (metadata_words_at_top)|<- FP of caller | (metadata_words_at_top)|<- FP of caller
// ========================== ==========================
// | ijava_state | | ijava_state |
// | | | |
// |------------------------| |------------------------|
// | P0 | | P0 |
// | : | | : |
// | Pn |<- unext. SP | Pn |<- unext. SP
// |------------------------| + metadata |------------------------| + metadata
// | frame::java_abi | | frame::java_abi |
// | (metadata_words_at_top)|<- SP == unext. SP | (metadata_words_at_top)|<- unextended SP of caller (1)
// ========================== of caller |------------------------|
// | Stack Args |
// overlap = 0 | (if any) |
// |------------------------|
// f is the frame to be relocated on the heap | frame::java_abi |
// | (metadata_words_at_top)|<- new SP of caller / FP of new frame
// ==========================
// | |
// | Growth | | |
// v v |------------------------|
// | frame::java_abi |
// | (metadata_words_at_top)|<- SP == unext. SP of new frame
// ==========================
//
// ### Compiled Caller: Stackargs + ABI Overlap
//
// Caller on entry New frame with resized Caller
//
// | frame::java_abi | | frame::java_abi |
// | (metadata_words_at_top)|<- FP of caller | (metadata_words_at_top)|<- FP of caller
// ========================== ==========================
// | | | |
// | | | |
// |------------------------| ----- |------------------------|
// | Stack Args | ^ | Stack Args |
// | (if any) | | | (if any) |
// |------------------------| overlap |------------------------|
// | frame::java_abi | | | frame::java_abi |
// | (metadata_words_at_top)|<- SP == unext. SP v | (metadata_words_at_top)|<- SP == unext. SP of caller
// ========================== of caller ----- ========================== / FP of new frame
// | |
// overlap = stack_argsize(f) | |
// + frame::metadata_words_at_top |------------------------|
// | frame::java_abi |
// Where f is the frame to be relocated on the heap. | (metadata_words_at_top)|<- SP == unext. SP of new frame
// See also StackChunkFrameStream::frame_size(). ==========================
//
template<typename FKind>
frame FreezeBase::new_heap_frame(frame& f, frame& caller) {
assert(FKind::is_instance(f), "");
intptr_t *sp, *fp;
if (FKind::interpreted) {
intptr_t locals_offset = *f.addr_at(ijava_idx(locals));
// If the caller.is_empty(), i.e. we're freezing into an empty chunk, then we set
// the chunk's argsize in finalize_freeze and make room for it above the unextended_sp
// See also comment on StackChunkFrameStream<frame_kind>::interpreter_frame_size()
int overlap =
(caller.is_interpreted_frame() || caller.is_empty())
? ContinuationHelper::InterpretedFrame::stack_argsize(f) + frame::metadata_words_at_top
: 0;
fp = caller.unextended_sp() - 1 - locals_offset + overlap;
// esp points one slot below the last argument
intptr_t* x86_64_like_unextended_sp = f.interpreter_frame_esp() + 1 - frame::metadata_words_at_top;
sp = fp - (f.fp() - x86_64_like_unextended_sp);
assert (sp <= fp && (fp <= caller.unextended_sp() || caller.is_interpreted_frame()),
"sp=" PTR_FORMAT " fp=" PTR_FORMAT " caller.unextended_sp()=" PTR_FORMAT " caller.is_interpreted_frame()=%d",
p2i(sp), p2i(fp), p2i(caller.unextended_sp()), caller.is_interpreted_frame());
caller.set_sp(fp);
assert(_cont.tail()->is_in_chunk(sp), "");
frame hf(sp, sp, fp, f.pc(), nullptr, nullptr, true /* on_heap */);
// frame_top() and frame_bottom() read these before relativize_interpreted_frame_metadata() is called
*hf.addr_at(ijava_idx(locals)) = locals_offset;
*hf.addr_at(ijava_idx(esp)) = f.interpreter_frame_esp() - f.fp();
return hf;
} else {
int fsize = FKind::size(f);
sp = caller.unextended_sp() - fsize;
if (caller.is_interpreted_frame()) {
// If the caller is interpreted, our stackargs are not supposed to overlap with it
// so we make more room by moving sp down by argsize
int argsize = FKind::stack_argsize(f);
sp -= argsize + frame::metadata_words_at_top;
}
fp = sp + fsize;
caller.set_sp(fp);
assert(_cont.tail()->is_in_chunk(sp), "");
return frame(sp, sp, fp, f.pc(), nullptr, nullptr, true /* on_heap */);
}
}
inline void FreezeBase::patch_pd(frame& hf, const frame& caller) {
if (caller.is_interpreted_frame()) {
assert(!caller.is_empty(), "");
patch_callee_link_relative(caller, caller.fp());
}
#ifdef ASSERT
else {
// For compiled frames the back link is actually redundant. It gets computed
// as unextended_sp + frame_size.
// Note the difference on x86_64: the link is not made relative if the caller
// is a compiled frame because there rbp is used as a non-volatile register by
// c1/c2 so it could be a computed value local to the caller.
// See also:
// - FreezeBase::set_top_frame_metadata_pd
// - StackChunkFrameStream<frame_kind>::fp()
// - UseContinuationFastPath: compiled frames are copied in a batch w/o patching the back link.
// The backlinks are restored when thawing (see Thaw<ConfigT>::patch_caller_links())
patch_callee_link(hf, (intptr_t*)badAddress);
}
#endif
}
inline void FreezeBase::patch_pd_unused(intptr_t* sp) {
}
inline intptr_t* AnchorMark::anchor_mark_set_pd() {
// Nothing to do on PPC because the interpreter does not use SP as expression stack pointer.
// Instead there is a dedicated register R15_esp which is not affected by VM calls.
return _top_frame.sp();
}
inline void AnchorMark::anchor_mark_clear_pd() {
}
//////// Thaw
// Fast path
inline void ThawBase::prefetch_chunk_pd(void* start, int size) {
size <<= LogBytesPerWord;
Prefetch::read(start, size);
Prefetch::read(start, size - 64);
}
// Set back chain links of fast thawed frames such that *sp == callers_sp.
// See https://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi.html#STACK
template <typename ConfigT>
inline void Thaw<ConfigT>::patch_caller_links(intptr_t* sp, intptr_t* bottom) {
for (intptr_t* callers_sp; sp < bottom; sp = callers_sp) {
address pc = (address)((frame::java_abi*) sp)->lr;
assert(pc != nullptr, "");
// see ThawBase::patch_return() which gets called just before
bool is_entry_frame = pc == StubRoutines::cont_returnBarrier() || pc == _cont.entryPC();
if (is_entry_frame) {
callers_sp = _cont.entryFP();
} else {
assert(!Interpreter::contains(pc), "sp:" PTR_FORMAT " pc:" PTR_FORMAT, p2i(sp), p2i(pc));
CodeBlob* cb = CodeCache::find_blob_fast(pc);
callers_sp = sp + cb->frame_size();
}
// set the back link
((frame::java_abi*) sp)->callers_sp = (intptr_t) callers_sp;
}
}
// Slow path
inline frame ThawBase::new_entry_frame() {
intptr_t* sp = _cont.entrySP();
return frame(sp, _cont.entryPC(), sp, _cont.entryFP());
}
// === New Interpreted Frame ================================================================================================================
//
// ### Non-Interpreted Caller (compiled, enterSpecial): No Overlap
//
// Heap Frame `hf` `hf` gets copied to stack _without_ overlapping the caller
//
// | | Non-Interpreted | |
// | |<- bottom Caller |----------------------|
// |----------------------| ^ | frame::java_abi |<- unextended SP
// | L0 aka P0 | | --- ========================
// | : : | | ^ | L0 aka P0 |
// | : Pn | | | | : : | Parameters do
// | : | | | | : Pn | not overlap with
// | Lm | | | | : | caller!
// |----------------------| `fsize` | | : |
// | frame::java_abi | | | : |
// ======================== | `fsize` + padding | Lm |
// | | | |----------------------|
// | ijava_state | | | | Opt. Align. Padding |
// | | | | |----------------------|
// |----------------------| | | | frame::java_abi |<- new SP of caller
// | L0 aka P0 | | | ======================== / FP of new frame
// | : : | | | | | (aligned)
// | : Pn |<- unext. SP + metadata | | ijava_state |
// | : | | | | |
// | Lm | | | |----------------------|
// |----------------------| v | | P0 |
// | frame::java_abi |<- SP / unextended SP | | : |
// ======================== | | Pi |<- unextended SP + metadata
// | |----------------------|
// | Growth | v | frame::java_abi |<- unextended SP / SP of new frame
// v v --- ======================== (not yet aligned(1))
//
//
// ### Interpreted Caller: Overlap with Caller
//
// Caller New frame with resized/aligned Caller
//
// | | | |
// | ijava_state | | ijava_state |
// |----------------------| |----------------------|
// | non param. expr. | bottom | non param. expr. |
// | - - - - - - - - - - | --- ^ | - - - - - - - - - - |
// | P0 | ^ | | L0 aka P0 |
// | : | | | | : : |
// | Pn |<- unextended SP overlap | | : Pn |<- unextended SP
// |----------------------| + metadata_words_at_top | | | : | + metadata_words_at_top
// | frame::java_abi |<- unextended SP v | | : | (unaligned)
// ======================== / SP of new frame --- | | : | of caller
// (not yet aligned(1)) | | Lm |
// `fsize` |----------------------|
// overlap = stack_argsize(hf) + padding| Opt. Align. Padding |
// + frame::metadata_words_at_top | |----------------------|
// | | frame::java_abi |<- new SP of caller
// | ======================== / FP of new frame
// | | | (aligned)
// | Growth | | | ijava_state |
// v v | | |
// | |----------------------|
// | | P0 |
// | | : |
// | | Pi |<- unextended SP
// | |----------------------| + metadata_words_at_top
// v | frame::java_abi |<- unextended SP / SP of new frame
// --- ======================== (not yet aligned(1))
//
//
// (1) The SP / unextended SP of the new interpreted frame is not aligned. It
// gets aligned when its callee is pushed on stack or in finish_thaw() if
// it is the top frame. This allows addressing parameters: unextended SP + metadata_words_at_top
//
// (2) If caller is interpreted then its ijava_state::top_frame_sp will be used as sender sp
// of the new frame (see ContinuationHelper::InterpretedFrame::patch_sender_sp() and diagram at the end of this file)
//
// (3) The size of alignment padding required when thawing frames is accounted for
// in FreezeBase::_align_size.
//
// === New Compiled Frame ===================================================================================================================
//
// Compiled Caller Interpreted Caller
//
// - stackargs+abi overlap with caller - gets resized for stackargs
// - no alignment padding - SP gets aligned
// - no overlap with orig.
// caller
// O C
// r a | | | |
// i l | | | |
// g l |----------------------| | |
// i e | Stack Args | | |
// n r | (if any) | |----------------------|
// a |----------------------| | frame::java_abi |
// l | frame::java_abi |<- unext. SP / SP | (unused) |<- unal.unext.SP
// - - - ======================== - - - - - - - - - - |----------------------|- - - - - - - - - - - - - - - - - - - - - - - - - - - -
// N | | | Opt. Align. Padding |
// e | | |----------------------|
// w |----------------------| | Stack Args |
// | frame::java_abi |<- unext. SP / SP | (if any) |
// F ======================== |----------------------|
// r | frame::java_abi |<- caller's SP
// a ======================== / new frame's FP
// m | | (aligned)
// e | |
// |----------------------|
// | frame::java_abi |<- unext. SP / SP
// ========================
//
// If the new frame is at the bottom just above the ContinuationEntry frame then the stackargs
// don't overlap the caller either even though it is compiled because the size is not
// limited/known. In contrast to the interpreted caller case the abi overlaps with the caller
// if there are no stackargs. This is to comply with shared code (see e.g. StackChunkFrameStream::frame_size())
//
template<typename FKind> frame ThawBase::new_stack_frame(const frame& hf, frame& caller, bool bottom) {
assert(FKind::is_instance(hf), "");
assert(is_aligned(caller.fp(), frame::frame_alignment), PTR_FORMAT, p2i(caller.fp()));
// caller.sp() can be unaligned. This is fixed below.
if (FKind::interpreted) {
// Note: we have to overlap with the caller, at least if it is interpreted, to match the
// max_thawing_size calculation during freeze. See also comment above.
intptr_t* heap_sp = hf.unextended_sp();
const int fsize = ContinuationHelper::InterpretedFrame::frame_bottom(hf) - hf.unextended_sp();
const int overlap = !caller.is_interpreted_frame() ? 0
: ContinuationHelper::InterpretedFrame::stack_argsize(hf) + frame::metadata_words_at_top;
intptr_t* frame_sp = caller.unextended_sp() + overlap - fsize;
intptr_t* fp = frame_sp + (hf.fp() - heap_sp);
// align fp
int padding = fp - align_down(fp, frame::frame_alignment);
fp -= padding;
// alignment of sp is done by callee or in finish_thaw()
frame_sp -= padding;
// On ppc esp points to the next free slot on the expression stack and sp + metadata points to the last parameter
DEBUG_ONLY(intptr_t* esp = fp + *hf.addr_at(ijava_idx(esp));)
assert(frame_sp + frame::metadata_words_at_top == esp+1, " frame_sp=" PTR_FORMAT " esp=" PTR_FORMAT, p2i(frame_sp), p2i(esp));
caller.set_sp(fp);
frame f(frame_sp, hf.pc(), frame_sp, fp);
// we need to set the locals so that the caller of new_stack_frame() can call
// ContinuationHelper::InterpretedFrame::frame_bottom
// copy relativized locals from the heap frame
*f.addr_at(ijava_idx(locals)) = *hf.addr_at(ijava_idx(locals));
return f;
} else {
int fsize = FKind::size(hf);
int argsize = FKind::stack_argsize(hf);
intptr_t* frame_sp = caller.sp() - fsize;
if ((bottom && argsize > 0) || caller.is_interpreted_frame()) {
frame_sp -= argsize + frame::metadata_words_at_top;
frame_sp = align_down(frame_sp, frame::alignment_in_bytes);
caller.set_sp(frame_sp + fsize);
}
assert(hf.cb() != nullptr, "");
assert(hf.oop_map() != nullptr, "");
intptr_t* fp = frame_sp + fsize;
return frame(frame_sp, frame_sp, fp, hf.pc(), hf.cb(), hf.oop_map(), false);
}
}
inline intptr_t* ThawBase::align(const frame& hf, intptr_t* frame_sp, frame& caller, bool bottom) {
// Unused. Alignment is done directly in new_stack_frame() / finish_thaw().
return nullptr;
}
inline void ThawBase::derelativize_interpreted_frame_metadata(const frame& hf, const frame& f) {
intptr_t* vfp = f.fp();
// Make sure that monitors is still relativized.
assert(f.at_absolute(ijava_idx(monitors)) <= -(frame::ijava_state_size / wordSize), "");
// Make sure that esp is still relativized.
assert(f.at_absolute(ijava_idx(esp)) <= f.at_absolute(ijava_idx(monitors)), "");
// Keep top_frame_sp relativized.
}
inline intptr_t* ThawBase::push_cleanup_continuation() {
frame enterSpecial = new_entry_frame();
frame::common_abi* enterSpecial_abi = (frame::common_abi*)enterSpecial.sp();
enterSpecial_abi->lr = (intptr_t)ContinuationEntry::cleanup_pc();
log_develop_trace(continuations, preempt)("push_cleanup_continuation enterSpecial sp: " INTPTR_FORMAT " cleanup pc: " INTPTR_FORMAT,
p2i(enterSpecial_abi),
p2i(ContinuationEntry::cleanup_pc()));
return enterSpecial.sp();
}
inline intptr_t* ThawBase::push_preempt_adapter() {
frame enterSpecial = new_entry_frame();
frame::common_abi* enterSpecial_abi = (frame::common_abi*)enterSpecial.sp();
enterSpecial_abi->lr = (intptr_t)StubRoutines::cont_preempt_stub();
log_develop_trace(continuations, preempt)("push_preempt_adapter enterSpecial sp: " INTPTR_FORMAT " adapter pc: " INTPTR_FORMAT,
p2i(enterSpecial_abi),
p2i(StubRoutines::cont_preempt_stub()));
return enterSpecial.sp();
}
inline void ThawBase::patch_pd(frame& f, const frame& caller) {
patch_callee_link(caller, caller.fp());
// Prevent assertion if f gets deoptimized right away before it's fully initialized
f.mark_not_fully_initialized();
}
inline void ThawBase::patch_pd(frame& f, intptr_t* caller_sp) {
assert(f.own_abi()->callers_sp == (uint64_t)caller_sp, "should have been fixed by patch_caller_links");
}
//
// Interpreter Calling Procedure on PPC
//
// Caller Resized Caller before the Call New Callee Frame
//
// - SP/FP are 16 byte aligned. - The unused part of the expression stack - The caller's original SP is passed as
// Padding is added as necessary. is removed sender SP (in R21_sender_SP) also by
// - SP is _not_ used as esp - Slots for the callee's nonparameter locals compiled callers. It is saved in the
// (expression stack pointer) are added. ijava_state::sender_sp slot and
// - Has reserved slots for the - The large ABI is replaced with a minimal restored when returning.
// maximal expression stack ABI. This removes a c2i extension if there
// - Has a larger ABI section on - The original SP was saved in is one.
// top that is required to call ijava_state::top_frame_sp slot. - ijava_state::sender_sp will be set
// C++ code From there it is restored as SP _after_ as the caller's unextended sp when
// returning from a call. This reverts the iterating stack frames
// resizing described above. It is also (see frame::unextended_sp() and
// required to undo potential i2c extensions frame::sender_for_interpreter_frame())
// if the calle should be compiled.
// - Note that unextended SP < SP
// is possible on ppc.
//
// | | | | | |
// | (frame::java_abi) | | (frame::java_abi) | | (frame::java_abi) |
// | 4 words | | 4 words | | 4 words |
// | Caller's SP |<- FP of caller | Caller's SP |<- FP of caller | Caller's SP |<- FP of caller
// ======================== (aligned) ======================== ========================
// | frame:: | | frame:: | | frame:: |
// | ijava_state | | ijava_state | | ijava_state |
// | | | | | |
// |----------------------| |----------------------| |----------------------|
// | P0 | | L0 aka P0 | | L0 aka P0 |
// | | | : | | : |
// | Pn | | : Pn | | : Pn |
// |----------------------| | : | | : |
// | | | Lm | | Lm |
// | Reserved Expr. Stack | |----------------------| |----------------------|
// | | | Opt. Alignm. Padding | | Opt. Alignm. Padding |
// | |<- ConstMethod |----------------------| |----------------------|
// |----------------------| ::_max_stack | | | |
// | Opt. Alignm. Padding | | (frame::java_abi) | | (frame::java_abi) |
// |----------------------| | 4 words | | 4 words |
// | Large ABI | | Caller's SP |<- new SP of caller | Caller's SP |<- SP of caller /
// | for C++ calls | ======================== (aligned) ======================== FP of callee
// | (frame:: | | frame:: | (aligned)
// | native_abi_reg_args)| | ijava_state |
// | | | |
// | | |----------------------|
// | | | |
// | Caller's SP |<- SP of caller <- unextended SP | Reserved Expr. Stack |<- unextended SP
// ======================== (aligned) of caller | | of caller
// (aligned) | |
// | |
// | |
// | |
// | |<- ConstMethod
// |----------------------| ::_max_stack
// Resize Caller Push new Callee Frame | Opt. Alignm. Padding |
// --------------------> ------------------------> |----------------------|
// (ABI, expressions, locals) | Large ABI |
// | for C++ calls |
// | (frame:: |
// | native_abi_reg_args)|
// | Growth | | |
// v v | |
// | |
// | Caller's SP |<- SP of callee
// ======================== (aligned)
//
//
#endif // CPU_PPC_CONTINUATION_PPC_INLINE_HPP
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