src/hotspot/share/gc/shenandoah/shenandoahSharedVariables.hpp
author stefank
Tue, 26 Nov 2019 10:47:46 +0100
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8234748: Clean up atomic and orderAccess includes Reviewed-by: dholmes
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/*
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 * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
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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_GC_SHENANDOAH_SHENANDOAHSHAREDVARIABLES_HPP
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#define SHARE_GC_SHENANDOAH_SHENANDOAHSHAREDVARIABLES_HPP
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#include "memory/allocation.hpp"
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#include "runtime/atomic.hpp"
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typedef jbyte ShenandoahSharedValue;
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// Needed for cooperation with generated code.
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STATIC_ASSERT(sizeof(ShenandoahSharedValue) == 1);
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typedef struct ShenandoahSharedFlag {
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  enum {
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    UNSET = 0,
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    SET = 1
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  };
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  DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile ShenandoahSharedValue));
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  volatile ShenandoahSharedValue value;
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  DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, 0);
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  ShenandoahSharedFlag() {
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    unset();
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  }
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  void set() {
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    Atomic::release_store_fence(&value, (ShenandoahSharedValue)SET);
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  }
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  void unset() {
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    Atomic::release_store_fence(&value, (ShenandoahSharedValue)UNSET);
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  }
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  bool is_set() const {
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    return Atomic::load_acquire(&value) == SET;
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  }
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  bool is_unset() const {
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    return Atomic::load_acquire(&value) == UNSET;
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  }
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  void set_cond(bool val) {
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    if (val) {
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      set();
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    } else {
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      unset();
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    }
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  }
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  bool try_set() {
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    if (is_set()) {
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      return false;
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    }
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    ShenandoahSharedValue old = Atomic::cmpxchg(&value, (ShenandoahSharedValue)UNSET, (ShenandoahSharedValue)SET);
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    return old == UNSET; // success
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  }
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  bool try_unset() {
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    if (!is_set()) {
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      return false;
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    }
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    ShenandoahSharedValue old = Atomic::cmpxchg(&value, (ShenandoahSharedValue)SET, (ShenandoahSharedValue)UNSET);
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    return old == SET; // success
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  }
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  volatile ShenandoahSharedValue* addr_of() {
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    return &value;
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  }
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private:
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  volatile ShenandoahSharedValue* operator&() {
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    fatal("Use addr_of() instead");
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    return NULL;
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  }
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  bool operator==(ShenandoahSharedFlag& other) { fatal("Use is_set() instead"); return false; }
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  bool operator!=(ShenandoahSharedFlag& other) { fatal("Use is_set() instead"); return false; }
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  bool operator> (ShenandoahSharedFlag& other) { fatal("Use is_set() instead"); return false; }
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  bool operator>=(ShenandoahSharedFlag& other) { fatal("Use is_set() instead"); return false; }
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  bool operator< (ShenandoahSharedFlag& other) { fatal("Use is_set() instead"); return false; }
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  bool operator<=(ShenandoahSharedFlag& other) { fatal("Use is_set() instead"); return false; }
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} ShenandoahSharedFlag;
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typedef struct ShenandoahSharedBitmap {
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  DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile ShenandoahSharedValue));
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  volatile ShenandoahSharedValue value;
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  DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, 0);
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  ShenandoahSharedBitmap() {
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    clear();
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  }
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  void set(uint mask) {
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    assert (mask < (sizeof(ShenandoahSharedValue) * CHAR_MAX), "sanity");
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    ShenandoahSharedValue mask_val = (ShenandoahSharedValue) mask;
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    while (true) {
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      ShenandoahSharedValue ov = Atomic::load_acquire(&value);
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      if ((ov & mask_val) != 0) {
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        // already set
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        return;
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      }
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      ShenandoahSharedValue nv = ov | mask_val;
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      if (Atomic::cmpxchg(&value, ov, nv) == ov) {
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        // successfully set
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        return;
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      }
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    }
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  }
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  void unset(uint mask) {
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    assert (mask < (sizeof(ShenandoahSharedValue) * CHAR_MAX), "sanity");
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    ShenandoahSharedValue mask_val = (ShenandoahSharedValue) mask;
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    while (true) {
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      ShenandoahSharedValue ov = Atomic::load_acquire(&value);
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      if ((ov & mask_val) == 0) {
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        // already unset
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        return;
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      }
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      ShenandoahSharedValue nv = ov & ~mask_val;
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      if (Atomic::cmpxchg(&value, ov, nv) == ov) {
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        // successfully unset
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        return;
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      }
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    }
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  }
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  void clear() {
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    Atomic::release_store_fence(&value, (ShenandoahSharedValue)0);
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  }
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  bool is_set(uint mask) const {
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    return !is_unset(mask);
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  }
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  bool is_unset(uint mask) const {
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    assert (mask < (sizeof(ShenandoahSharedValue) * CHAR_MAX), "sanity");
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    return (Atomic::load_acquire(&value) & (ShenandoahSharedValue) mask) == 0;
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  }
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  bool is_clear() const {
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    return (Atomic::load_acquire(&value)) == 0;
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  }
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  void set_cond(uint mask, bool val) {
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    if (val) {
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      set(mask);
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    } else {
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      unset(mask);
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    }
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  }
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  volatile ShenandoahSharedValue* addr_of() {
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    return &value;
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  }
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  ShenandoahSharedValue raw_value() const {
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    return value;
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  }
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private:
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  volatile ShenandoahSharedValue* operator&() {
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    fatal("Use addr_of() instead");
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    return NULL;
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  }
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  bool operator==(ShenandoahSharedFlag& other) { fatal("Use is_set() instead"); return false; }
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  bool operator!=(ShenandoahSharedFlag& other) { fatal("Use is_set() instead"); return false; }
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  bool operator> (ShenandoahSharedFlag& other) { fatal("Use is_set() instead"); return false; }
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  bool operator>=(ShenandoahSharedFlag& other) { fatal("Use is_set() instead"); return false; }
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  bool operator< (ShenandoahSharedFlag& other) { fatal("Use is_set() instead"); return false; }
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  bool operator<=(ShenandoahSharedFlag& other) { fatal("Use is_set() instead"); return false; }
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} ShenandoahSharedBitmap;
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template<class T>
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struct ShenandoahSharedEnumFlag {
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  DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile ShenandoahSharedValue));
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  volatile ShenandoahSharedValue value;
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  DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, 0);
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  ShenandoahSharedEnumFlag() {
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    value = 0;
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  }
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  void set(T v) {
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    assert (v >= 0, "sanity");
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    assert (v < (sizeof(ShenandoahSharedValue) * CHAR_MAX), "sanity");
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    Atomic::release_store_fence(&value, (ShenandoahSharedValue)v);
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  }
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  T get() const {
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    return (T)Atomic::load_acquire(&value);
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  }
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  T cmpxchg(T new_value, T expected) {
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    assert (new_value >= 0, "sanity");
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    assert (new_value < (sizeof(ShenandoahSharedValue) * CHAR_MAX), "sanity");
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    return (T)Atomic::cmpxchg(&value, (ShenandoahSharedValue)expected, (ShenandoahSharedValue)new_value);
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  }
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  volatile ShenandoahSharedValue* addr_of() {
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    return &value;
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  }
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private:
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  volatile T* operator&() {
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    fatal("Use addr_of() instead");
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    return NULL;
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  }
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  bool operator==(ShenandoahSharedEnumFlag& other) { fatal("Use get() instead"); return false; }
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  bool operator!=(ShenandoahSharedEnumFlag& other) { fatal("Use get() instead"); return false; }
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  bool operator> (ShenandoahSharedEnumFlag& other) { fatal("Use get() instead"); return false; }
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  bool operator>=(ShenandoahSharedEnumFlag& other) { fatal("Use get() instead"); return false; }
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  bool operator< (ShenandoahSharedEnumFlag& other) { fatal("Use get() instead"); return false; }
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  bool operator<=(ShenandoahSharedEnumFlag& other) { fatal("Use get() instead"); return false; }
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};
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#endif // SHARE_GC_SHENANDOAH_SHENANDOAHSHAREDVARIABLES_HPP