jdk

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/*
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 * Copyright (c) 2018, 2022, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "classfile/javaClasses.inline.hpp"
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#include "jfr/jfrEvents.hpp"
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#include "jfr/support/jfrThreadId.hpp"
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#include "logging/log.hpp"
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#include "logging/logStream.hpp"
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#include "oops/oopsHierarchy.hpp"
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#include "oops/stackChunkOop.inline.hpp"
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#include "runtime/continuation.hpp"
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#include "runtime/continuationEntry.inline.hpp"
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#include "runtime/continuationHelper.inline.hpp"
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#include "runtime/continuationWrapper.inline.hpp"
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#include "runtime/javaThread.hpp"
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#include "runtime/stackChunkFrameStream.inline.hpp"
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ContinuationWrapper::ContinuationWrapper(const RegisterMap* map)
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  : ContinuationWrapper(map->thread(),
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                        Continuation::get_continuation_entry_for_continuation(map->thread(), map->stack_chunk()->cont()),
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                        map->stack_chunk()->cont()) {
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  assert(_entry == nullptr || _continuation == _entry->cont_oop(map->thread()),
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    "cont: " INTPTR_FORMAT " entry: " INTPTR_FORMAT " entry_sp: " INTPTR_FORMAT,
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    p2i( (oopDesc*)_continuation), p2i((oopDesc*)_entry->cont_oop(map->thread())), p2i(entrySP()));
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}
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const frame ContinuationWrapper::last_frame() {
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  stackChunkOop chunk = last_nonempty_chunk();
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  if (chunk == nullptr) {
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    return frame();
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  }
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  return StackChunkFrameStream<ChunkFrames::Mixed>(chunk).to_frame();
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}
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stackChunkOop ContinuationWrapper::find_chunk_by_address(void* p) const {
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  for (stackChunkOop chunk = tail(); chunk != nullptr; chunk = chunk->parent()) {
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    if (chunk->is_in_chunk(p)) {
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      assert(chunk->is_usable_in_chunk(p), "");
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      return chunk;
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    }
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  }
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  return nullptr;
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}
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#ifndef PRODUCT
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intptr_t ContinuationWrapper::hash() {
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  return Thread::current()->is_Java_thread() ? _continuation->identity_hash() : -1;
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}
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#endif
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#ifdef ASSERT
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bool ContinuationWrapper::is_entry_frame(const frame& f) {
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  return f.sp() == entrySP();
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}
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bool ContinuationWrapper::chunk_invariant() const {
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  // only the topmost chunk can be empty
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  if (_tail == nullptr) {
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    return true;
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  }
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  int i = 1;
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  for (stackChunkOop chunk = _tail->parent(); chunk != nullptr; chunk = chunk->parent()) {
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    if (chunk->is_empty()) {
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      assert(chunk != _tail, "");
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      return false;
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    }
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    i++;
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  }
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  return true;
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}
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#endif // ASSERT
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