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134 lines
4.0 KiB
C++
134 lines
4.0 KiB
C++
/*
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* Copyright (c) 2020, 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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#ifndef SHARE_RUNTIME_STACKWATERMARK_INLINE_HPP
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#define SHARE_RUNTIME_STACKWATERMARK_INLINE_HPP
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#include "runtime/stackWatermark.hpp"
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#include "code/nmethod.hpp"
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#include "runtime/frame.inline.hpp"
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#include "runtime/javaThread.hpp"
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#include "runtime/registerMap.hpp"
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static inline bool is_above_watermark(uintptr_t sp, uintptr_t watermark) {
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if (watermark == 0) {
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return false;
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}
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return sp > watermark;
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}
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// Returns true for frames where stack watermark barriers have been inserted.
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// This function may return false negatives, but may never return true if a
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// frame has no barrier.
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inline bool StackWatermark::has_barrier(const frame& f) {
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if (f.is_interpreted_frame()) {
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return true;
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}
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if (f.is_compiled_frame()) {
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nmethod* nm = f.cb()->as_nmethod();
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if (nm->is_compiled_by_c1() || nm->is_compiled_by_c2()) {
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return true;
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}
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if (nm->is_native_method()) {
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return true;
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}
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}
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return false;
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}
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inline bool StackWatermark::processing_started(uint32_t state) const {
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return StackWatermarkState::epoch(state) == epoch_id();
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}
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inline bool StackWatermark::processing_completed(uint32_t state) const {
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assert(processing_started(state), "Check is only valid if processing has been started");
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return StackWatermarkState::is_done(state);
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}
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inline void StackWatermark::ensure_safe(const frame& f) {
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assert(processing_started(), "Processing should already have started");
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if (processing_completed_acquire()) {
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return;
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}
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uintptr_t f_fp = reinterpret_cast<uintptr_t>(f.real_fp());
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if (is_above_watermark(f_fp, watermark())) {
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process_one();
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}
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assert_is_frame_safe(f);
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}
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inline void StackWatermark::before_unwind() {
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frame f = _jt->last_frame();
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// Skip any stub frames etc up until the frame that triggered before_unwind().
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RegisterMap map(_jt,
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RegisterMap::UpdateMap::skip,
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RegisterMap::ProcessFrames::skip,
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RegisterMap::WalkContinuation::skip);
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if (f.is_safepoint_blob_frame() || f.is_runtime_frame()) {
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f = f.sender(&map);
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}
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assert_is_frame_safe(f);
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assert(!f.is_runtime_frame(), "should have skipped all runtime stubs");
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// before_unwind() potentially exposes a new frame. The new exposed frame is
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// always the caller of the top frame.
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if (!f.is_first_frame()) {
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f = f.sender(&map);
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ensure_safe(f);
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}
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}
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inline void StackWatermark::after_unwind() {
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frame f = _jt->last_frame();
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if (f.is_safepoint_blob_frame() || f.is_runtime_frame()) {
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// Skip safepoint blob.
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RegisterMap map(_jt,
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RegisterMap::UpdateMap::skip,
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RegisterMap::ProcessFrames::skip,
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RegisterMap::WalkContinuation::skip);
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f = f.sender(&map);
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}
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assert(!f.is_runtime_frame(), "should have skipped all runtime stubs");
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// after_unwind() potentially exposes the top frame.
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ensure_safe(f);
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}
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inline void StackWatermark::on_iteration(const frame& f) {
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if (process_on_iteration()) {
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ensure_safe(f);
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}
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}
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#endif // SHARE_RUNTIME_STACKWATERMARK_INLINE_HPP
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