src/hotspot/share/runtime/stackValue.hpp
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
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/*
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 * Copyright (c) 1997, 2010, 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_VM_RUNTIME_STACKVALUE_HPP
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#define SHARE_VM_RUNTIME_STACKVALUE_HPP
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#include "code/location.hpp"
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#include "runtime/handles.hpp"
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class StackValue : public ResourceObj {
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 private:
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  BasicType _type;
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  intptr_t  _i; // Blank java stack slot value
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  Handle    _o; // Java stack slot value interpreted as a Handle
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 public:
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  StackValue(intptr_t value) {
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    _type  = T_INT;
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    _i     = value;
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  }
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  StackValue(Handle value, intptr_t scalar_replaced = 0) {
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    _type    = T_OBJECT;
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    _i       = scalar_replaced;
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    _o       = value;
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    assert(_i == 0 || _o.is_null(), "not null object should not be marked as scalar replaced");
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  }
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  StackValue() {
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    _type   = T_CONFLICT;
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    _i      = 0;
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  }
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  // Only used during deopt- preserve object type.
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  StackValue(intptr_t o, BasicType t) {
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    assert(t == T_OBJECT, "should not be used");
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    _type   = t;
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    _i      = o;
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  }
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  Handle get_obj() const {
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    assert(type() == T_OBJECT, "type check");
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    return _o;
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  }
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  bool obj_is_scalar_replaced() const {
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    assert(type() == T_OBJECT, "type check");
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    return _i != 0;
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  }
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  void set_obj(Handle value) {
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    assert(type() == T_OBJECT, "type check");
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    _o = value;
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  }
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  intptr_t get_int() const {
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    assert(type() == T_INT, "type check");
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    return _i;
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  }
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  // For special case in deopt.
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  intptr_t get_int(BasicType t) const {
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    assert(t == T_OBJECT && type() == T_OBJECT, "type check");
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    return _i;
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  }
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  void set_int(intptr_t value) {
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    assert(type() == T_INT, "type check");
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    _i = value;
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  }
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  BasicType type() const { return  _type; }
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  bool equal(StackValue *value) {
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    if (_type != value->_type) return false;
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    if (_type == T_OBJECT)
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      return (_o == value->_o);
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    else {
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      assert(_type == T_INT, "sanity check");
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      // [phh] compare only low addressed portions of intptr_t slots
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      return (*(int *)&_i == *(int *)&value->_i);
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    }
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  }
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  static StackValue* create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv);
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  static BasicLock*  resolve_monitor_lock(const frame* fr, Location location);
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#ifndef PRODUCT
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 public:
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  // Printing
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  void print_on(outputStream* st) const;
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#endif
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};
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#endif // SHARE_VM_RUNTIME_STACKVALUE_HPP