1 /* 2 * Copyright (c) 2022, 2024, 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 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "code/compiledIC.hpp" 27 #include "code/nmethod.hpp" 28 #include "oops/method.inline.hpp" 29 #include "runtime/continuation.hpp" 30 #include "runtime/continuationEntry.inline.hpp" 31 #include "runtime/continuationHelper.inline.hpp" 32 #include "runtime/frame.inline.hpp" 33 #include "runtime/javaThread.hpp" 34 #include "runtime/stackFrameStream.inline.hpp" 35 #include "runtime/stackWatermarkSet.inline.hpp" 36 #include "runtime/stubRoutines.hpp" 37 38 int ContinuationEntry::_return_pc_offset = 0; 39 address ContinuationEntry::_return_pc = nullptr; 40 nmethod* ContinuationEntry::_enter_special = nullptr; 41 int ContinuationEntry::_interpreted_entry_offset = 0; 42 43 void ContinuationEntry::set_enter_code(nmethod* nm, int interpreted_entry_offset) { 44 assert(_return_pc_offset != 0, ""); 45 _return_pc = nm->code_begin() + _return_pc_offset; 46 47 _enter_special = nm; 48 _interpreted_entry_offset = interpreted_entry_offset; 49 assert(_enter_special->code_contains(compiled_entry()), "entry not in enterSpecial"); 50 assert(_enter_special->code_contains(interpreted_entry()), "entry not in enterSpecial"); 51 assert(interpreted_entry() < compiled_entry(), "unexpected code layout"); 52 } 53 54 address ContinuationEntry::compiled_entry() { 55 return _enter_special->verified_entry_point(); 56 } 57 58 address ContinuationEntry::interpreted_entry() { 59 return _enter_special->code_begin() + _interpreted_entry_offset; 60 } 61 62 bool ContinuationEntry::is_interpreted_call(address call_address) { 63 assert(_enter_special->code_contains(call_address), "call not in enterSpecial"); 64 assert(call_address >= interpreted_entry(), "unexpected location"); 65 return call_address < compiled_entry(); 66 } 67 68 ContinuationEntry* ContinuationEntry::from_frame(const frame& f) { 69 assert(Continuation::is_continuation_enterSpecial(f), ""); 70 return (ContinuationEntry*)f.unextended_sp(); 71 } 72 73 NOINLINE static void flush_stack_processing(JavaThread* thread, intptr_t* sp) { 74 log_develop_trace(continuations)("flush_stack_processing"); 75 for (StackFrameStream fst(thread, true, true); fst.current()->sp() <= sp; fst.next()) { 76 ; 77 } 78 } 79 80 inline void maybe_flush_stack_processing(JavaThread* thread, intptr_t* sp) { 81 StackWatermark* sw; 82 uintptr_t watermark; 83 if ((sw = StackWatermarkSet::get(thread, StackWatermarkKind::gc)) != nullptr 84 && (watermark = sw->watermark()) != 0 85 && watermark <= (uintptr_t)sp) { 86 flush_stack_processing(thread, sp); 87 } 88 } 89 90 void ContinuationEntry::flush_stack_processing(JavaThread* thread) const { 91 maybe_flush_stack_processing(thread, (intptr_t*)((uintptr_t)entry_sp() + ContinuationEntry::size())); 92 } 93 94 #ifndef PRODUCT 95 void ContinuationEntry::describe(FrameValues& values, int frame_no) const { 96 address usp = (address)this; 97 values.describe(frame_no, (intptr_t*)(usp + in_bytes(ContinuationEntry::parent_offset())), "parent"); 98 values.describe(frame_no, (intptr_t*)(usp + in_bytes(ContinuationEntry::cont_offset())), "continuation"); 99 values.describe(frame_no, (intptr_t*)(usp + in_bytes(ContinuationEntry::flags_offset())), "flags"); 100 values.describe(frame_no, (intptr_t*)(usp + in_bytes(ContinuationEntry::chunk_offset())), "chunk"); 101 values.describe(frame_no, (intptr_t*)(usp + in_bytes(ContinuationEntry::argsize_offset())), "argsize"); 102 values.describe(frame_no, (intptr_t*)(usp + in_bytes(ContinuationEntry::pin_count_offset())), "pin_count"); 103 values.describe(frame_no, (intptr_t*)(usp + in_bytes(ContinuationEntry::parent_cont_fastpath_offset())), "parent fastpath"); 104 values.describe(frame_no, (intptr_t*)(usp + in_bytes(ContinuationEntry::parent_held_monitor_count_offset())), "parent held monitor count"); 105 } 106 #endif 107 108 #ifdef ASSERT 109 bool ContinuationEntry::assert_entry_frame_laid_out(JavaThread* thread) { 110 assert(thread->has_last_Java_frame(), "Wrong place to use this assertion"); 111 112 ContinuationEntry* entry = thread->last_continuation(); 113 assert(entry != nullptr, ""); 114 115 intptr_t* unextended_sp = entry->entry_sp(); 116 intptr_t* sp; 117 if (entry->argsize() > 0) { 118 sp = entry->bottom_sender_sp(); 119 } else { 120 sp = unextended_sp; 121 bool interpreted_bottom = false; 122 RegisterMap map(thread, 123 RegisterMap::UpdateMap::skip, 124 RegisterMap::ProcessFrames::skip, 125 RegisterMap::WalkContinuation::skip); 126 frame f; 127 for (f = thread->last_frame(); 128 !f.is_first_frame() && f.sp() <= unextended_sp && !Continuation::is_continuation_enterSpecial(f); 129 f = f.sender(&map)) { 130 interpreted_bottom = f.is_interpreted_frame(); 131 } 132 assert(Continuation::is_continuation_enterSpecial(f), ""); 133 sp = interpreted_bottom ? f.sp() : entry->bottom_sender_sp(); 134 } 135 136 assert(sp != nullptr, ""); 137 assert(sp <= entry->entry_sp(), ""); 138 address pc = ContinuationHelper::return_address_at( 139 sp - frame::sender_sp_ret_address_offset()); 140 141 if (pc != StubRoutines::cont_returnBarrier()) { 142 CodeBlob* cb = pc != nullptr ? CodeCache::find_blob(pc) : nullptr; 143 assert(cb != nullptr, "sp: " INTPTR_FORMAT " pc: " INTPTR_FORMAT, p2i(sp), p2i(pc)); 144 assert(cb->as_nmethod()->method()->is_continuation_enter_intrinsic(), ""); 145 } 146 147 return true; 148 } 149 #endif // ASSERT