jdk8-mips64-public/hotspot: src/share/vm/opto/locknode.cpp@fd13a567f179 (annotated)

src/share/vm/opto/locknode.cpp@fd13a567f179 (annotated)

src/share/vm/opto/locknode.cpp

Thu, 24 May 2018 19:26:50 +0800

author: aoqi
date: Thu, 24 May 2018 19:26:50 +0800
changeset 8862: fd13a567f179
parent 6876: 710a3c8b516e
permissions: -rw-r--r--

#7046 C2 supports long branch
Contributed-by: fujie

 /*
  * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "opto/locknode.hpp"
 #include "opto/parse.hpp"
 #include "opto/rootnode.hpp"
 #include "opto/runtime.hpp"
 //=============================================================================
 const RegMask &BoxLockNode::in_RegMask(uint i) const {
   return _inmask;
 }
 const RegMask &BoxLockNode::out_RegMask() const {
   return *Matcher::idealreg2regmask[Op_RegP];
 }
 uint BoxLockNode::size_of() const { return sizeof(*this); }
 BoxLockNode::BoxLockNode( int slot ) : Node( Compile::current()->root() ),
                                        _slot(slot), _is_eliminated(false) {
   init_class_id(Class_BoxLock);
   init_flags(Flag_rematerialize);
   OptoReg::Name reg = OptoReg::stack2reg(_slot);
   _inmask.Insert(reg);
 }
 //-----------------------------hash--------------------------------------------
 uint BoxLockNode::hash() const {
   if (EliminateNestedLocks)
     return NO_HASH; // Each locked region has own BoxLock node
   return Node::hash() + _slot + (_is_eliminated ? Compile::current()->fixed_slots() : 0);
 }
 //------------------------------cmp--------------------------------------------
 uint BoxLockNode::cmp( const Node &n ) const {
   if (EliminateNestedLocks)
     return (&n == this); // Always fail except on self
   const BoxLockNode &bn = (const BoxLockNode &)n;
   return bn._slot == _slot && bn._is_eliminated == _is_eliminated;
 }
 BoxLockNode* BoxLockNode::box_node(Node* box) {
   // Chase down the BoxNode after RA which may spill box nodes.
   while (!box->is_BoxLock()) {
     //    if (box_node->is_SpillCopy()) {
     //      Node *m = box_node->in(1);
     //      if (m->is_Mach() && m->as_Mach()->ideal_Opcode() == Op_StoreP) {
     //        box_node = m->in(m->as_Mach()->operand_index(2));
     //        continue;
     //      }
     //    }
     assert(box->is_SpillCopy() || box->is_Phi(), "Bad spill of Lock.");
     // Only BoxLock nodes with the same stack slot are merged.
     // So it is enough to trace one path to find the slot value.
     box = box->in(1);
   }
   return box->as_BoxLock();
 }
 OptoReg::Name BoxLockNode::reg(Node* box) {
   return box_node(box)->in_RegMask(0).find_first_elem();
 }
 // Is BoxLock node used for one simple lock region (same box and obj)?
 bool BoxLockNode::is_simple_lock_region(LockNode** unique_lock, Node* obj) {
   LockNode* lock = NULL;
   bool has_one_lock = false;
   for (uint i = 0; i < this->outcnt(); i++) {
     Node* n = this->raw_out(i);
     assert(!n->is_Phi(), "should not merge BoxLock nodes");
     if (n->is_AbstractLock()) {
       AbstractLockNode* alock = n->as_AbstractLock();
       // Check lock's box since box could be referenced by Lock's debug info.
       if (alock->box_node() == this) {
         if (alock->obj_node()->eqv_uncast(obj)) {
           if ((unique_lock != NULL) && alock->is_Lock()) {
             if (lock == NULL) {
               lock = alock->as_Lock();
               has_one_lock = true;
             } else if (lock != alock->as_Lock()) {
               has_one_lock = false;
             }
           }
         } else {
           return false; // Different objects
         }
       }
     }
   }
 #ifdef ASSERT
   // Verify that FastLock and Safepoint reference only this lock region.
   for (uint i = 0; i < this->outcnt(); i++) {
     Node* n = this->raw_out(i);
     if (n->is_FastLock()) {
       FastLockNode* flock = n->as_FastLock();
       assert((flock->box_node() == this) && flock->obj_node()->eqv_uncast(obj),"");
     }
     // Don't check monitor info in safepoints since the referenced object could
     // be different from the locked object. It could be Phi node of different
     // cast nodes which point to this locked object.
     // We assume that no other objects could be referenced in monitor info
     // associated with this BoxLock node because all associated locks and
     // unlocks are reference only this one object.
   }
 #endif
   if (unique_lock != NULL && has_one_lock) {
     *unique_lock = lock;
   }
   return true;
 }
 //=============================================================================
 //-----------------------------hash--------------------------------------------
 uint FastLockNode::hash() const { return NO_HASH; }
 uint FastLockNode::size_of() const { return sizeof(*this); }
 //------------------------------cmp--------------------------------------------
 uint FastLockNode::cmp( const Node &n ) const {
   return (&n == this);                // Always fail except on self
 }
 //=============================================================================
 //-----------------------------hash--------------------------------------------
 uint FastUnlockNode::hash() const { return NO_HASH; }
 //------------------------------cmp--------------------------------------------
 uint FastUnlockNode::cmp( const Node &n ) const {
   return (&n == this);                // Always fail except on self
 }
 //
 // Create a counter which counts the number of times this lock is acquired
 //
 void FastLockNode::create_lock_counter(JVMState* state) {
   BiasedLockingNamedCounter* blnc = (BiasedLockingNamedCounter*)
            OptoRuntime::new_named_counter(state, NamedCounter::BiasedLockingCounter);
   _counters = blnc->counters();
 }
 void FastLockNode::create_rtm_lock_counter(JVMState* state) {
 #if INCLUDE_RTM_OPT
   Compile* C = Compile::current();
   if (C->profile_rtm() || (PrintPreciseRTMLockingStatistics && C->use_rtm())) {
     RTMLockingNamedCounter* rlnc = (RTMLockingNamedCounter*)
            OptoRuntime::new_named_counter(state, NamedCounter::RTMLockingCounter);
     _rtm_counters = rlnc->counters();
     if (UseRTMForStackLocks) {
       rlnc = (RTMLockingNamedCounter*)
            OptoRuntime::new_named_counter(state, NamedCounter::RTMLockingCounter);
       _stack_rtm_counters = rlnc->counters();
     }
   }
 #endif
 }
 //=============================================================================
 //------------------------------do_monitor_enter-------------------------------
 void Parse::do_monitor_enter() {
   kill_dead_locals();
   // Null check; get casted pointer.
   Node* obj = null_check(peek());
   // Check for locking null object
   if (stopped()) return;
   // the monitor object is not part of debug info expression stack
   pop();
   // Insert a FastLockNode which takes as arguments the current thread pointer,
   // the obj pointer & the address of the stack slot pair used for the lock.
   shared_lock(obj);
 }
 //------------------------------do_monitor_exit--------------------------------
 void Parse::do_monitor_exit() {
   kill_dead_locals();
   pop();                        // Pop oop to unlock
   // Because monitors are guaranteed paired (else we bail out), we know
   // the matching Lock for this Unlock.  Hence we know there is no need
   // for a null check on Unlock.
   shared_unlock(map()->peek_monitor_box(), map()->peek_monitor_obj());
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/opto/locknode.cpp@fd13a567f179 (annotated)

src/share/vm/opto/locknode.cpp