graphKit.cpp 152.5 KB
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/*
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 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
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 * 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.
 *
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 * 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.
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 *
 */

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#include "precompiled.hpp"
#include "compiler/compileLog.hpp"
#include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
#include "gc_implementation/g1/heapRegion.hpp"
#include "gc_interface/collectedHeap.hpp"
#include "memory/barrierSet.hpp"
#include "memory/cardTableModRefBS.hpp"
#include "opto/addnode.hpp"
#include "opto/graphKit.hpp"
#include "opto/idealKit.hpp"
#include "opto/locknode.hpp"
#include "opto/machnode.hpp"
#include "opto/parse.hpp"
#include "opto/rootnode.hpp"
#include "opto/runtime.hpp"
#include "runtime/deoptimization.hpp"
#include "runtime/sharedRuntime.hpp"
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//----------------------------GraphKit-----------------------------------------
// Main utility constructor.
GraphKit::GraphKit(JVMState* jvms)
  : Phase(Phase::Parser),
    _env(C->env()),
    _gvn(*C->initial_gvn())
{
  _exceptions = jvms->map()->next_exception();
  if (_exceptions != NULL)  jvms->map()->set_next_exception(NULL);
  set_jvms(jvms);
}

// Private constructor for parser.
GraphKit::GraphKit()
  : Phase(Phase::Parser),
    _env(C->env()),
    _gvn(*C->initial_gvn())
{
  _exceptions = NULL;
  set_map(NULL);
  debug_only(_sp = -99);
  debug_only(set_bci(-99));
}



//---------------------------clean_stack---------------------------------------
// Clear away rubbish from the stack area of the JVM state.
// This destroys any arguments that may be waiting on the stack.
void GraphKit::clean_stack(int from_sp) {
  SafePointNode* map      = this->map();
  JVMState*      jvms     = this->jvms();
  int            stk_size = jvms->stk_size();
  int            stkoff   = jvms->stkoff();
  Node*          top      = this->top();
  for (int i = from_sp; i < stk_size; i++) {
    if (map->in(stkoff + i) != top) {
      map->set_req(stkoff + i, top);
    }
  }
}


//--------------------------------sync_jvms-----------------------------------
// Make sure our current jvms agrees with our parse state.
JVMState* GraphKit::sync_jvms() const {
  JVMState* jvms = this->jvms();
  jvms->set_bci(bci());       // Record the new bci in the JVMState
  jvms->set_sp(sp());         // Record the new sp in the JVMState
  assert(jvms_in_sync(), "jvms is now in sync");
  return jvms;
}

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//--------------------------------sync_jvms_for_reexecute---------------------
// Make sure our current jvms agrees with our parse state.  This version
// uses the reexecute_sp for reexecuting bytecodes.
JVMState* GraphKit::sync_jvms_for_reexecute() {
  JVMState* jvms = this->jvms();
  jvms->set_bci(bci());          // Record the new bci in the JVMState
  jvms->set_sp(reexecute_sp());  // Record the new sp in the JVMState
  return jvms;
}

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#ifdef ASSERT
bool GraphKit::jvms_in_sync() const {
  Parse* parse = is_Parse();
  if (parse == NULL) {
    if (bci() !=      jvms()->bci())          return false;
    if (sp()  != (int)jvms()->sp())           return false;
    return true;
  }
  if (jvms()->method() != parse->method())    return false;
  if (jvms()->bci()    != parse->bci())       return false;
  int jvms_sp = jvms()->sp();
  if (jvms_sp          != parse->sp())        return false;
  int jvms_depth = jvms()->depth();
  if (jvms_depth       != parse->depth())     return false;
  return true;
}

// Local helper checks for special internal merge points
// used to accumulate and merge exception states.
// They are marked by the region's in(0) edge being the map itself.
// Such merge points must never "escape" into the parser at large,
// until they have been handed to gvn.transform.
static bool is_hidden_merge(Node* reg) {
  if (reg == NULL)  return false;
  if (reg->is_Phi()) {
    reg = reg->in(0);
    if (reg == NULL)  return false;
  }
  return reg->is_Region() && reg->in(0) != NULL && reg->in(0)->is_Root();
}

void GraphKit::verify_map() const {
  if (map() == NULL)  return;  // null map is OK
  assert(map()->req() <= jvms()->endoff(), "no extra garbage on map");
  assert(!map()->has_exceptions(),    "call add_exception_states_from 1st");
  assert(!is_hidden_merge(control()), "call use_exception_state, not set_map");
}

void GraphKit::verify_exception_state(SafePointNode* ex_map) {
  assert(ex_map->next_exception() == NULL, "not already part of a chain");
  assert(has_saved_ex_oop(ex_map), "every exception state has an ex_oop");
}
#endif

//---------------------------stop_and_kill_map---------------------------------
// Set _map to NULL, signalling a stop to further bytecode execution.
// First smash the current map's control to a constant, to mark it dead.
void GraphKit::stop_and_kill_map() {
  SafePointNode* dead_map = stop();
  if (dead_map != NULL) {
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    dead_map->disconnect_inputs(NULL, C); // Mark the map as killed.
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    assert(dead_map->is_killed(), "must be so marked");
  }
}


//--------------------------------stopped--------------------------------------
// Tell if _map is NULL, or control is top.
bool GraphKit::stopped() {
  if (map() == NULL)           return true;
  else if (control() == top()) return true;
  else                         return false;
}


//-----------------------------has_ex_handler----------------------------------
// Tell if this method or any caller method has exception handlers.
bool GraphKit::has_ex_handler() {
  for (JVMState* jvmsp = jvms(); jvmsp != NULL; jvmsp = jvmsp->caller()) {
    if (jvmsp->has_method() && jvmsp->method()->has_exception_handlers()) {
      return true;
    }
  }
  return false;
}

//------------------------------save_ex_oop------------------------------------
// Save an exception without blowing stack contents or other JVM state.
void GraphKit::set_saved_ex_oop(SafePointNode* ex_map, Node* ex_oop) {
  assert(!has_saved_ex_oop(ex_map), "clear ex-oop before setting again");
  ex_map->add_req(ex_oop);
  debug_only(verify_exception_state(ex_map));
}

inline static Node* common_saved_ex_oop(SafePointNode* ex_map, bool clear_it) {
  assert(GraphKit::has_saved_ex_oop(ex_map), "ex_oop must be there");
  Node* ex_oop = ex_map->in(ex_map->req()-1);
  if (clear_it)  ex_map->del_req(ex_map->req()-1);
  return ex_oop;
}

//-----------------------------saved_ex_oop------------------------------------
// Recover a saved exception from its map.
Node* GraphKit::saved_ex_oop(SafePointNode* ex_map) {
  return common_saved_ex_oop(ex_map, false);
}

//--------------------------clear_saved_ex_oop---------------------------------
// Erase a previously saved exception from its map.
Node* GraphKit::clear_saved_ex_oop(SafePointNode* ex_map) {
  return common_saved_ex_oop(ex_map, true);
}

#ifdef ASSERT
//---------------------------has_saved_ex_oop----------------------------------
// Erase a previously saved exception from its map.
bool GraphKit::has_saved_ex_oop(SafePointNode* ex_map) {
  return ex_map->req() == ex_map->jvms()->endoff()+1;
}
#endif

//-------------------------make_exception_state--------------------------------
// Turn the current JVM state into an exception state, appending the ex_oop.
SafePointNode* GraphKit::make_exception_state(Node* ex_oop) {
  sync_jvms();
  SafePointNode* ex_map = stop();  // do not manipulate this map any more
  set_saved_ex_oop(ex_map, ex_oop);
  return ex_map;
}


//--------------------------add_exception_state--------------------------------
// Add an exception to my list of exceptions.
void GraphKit::add_exception_state(SafePointNode* ex_map) {
  if (ex_map == NULL || ex_map->control() == top()) {
    return;
  }
#ifdef ASSERT
  verify_exception_state(ex_map);
  if (has_exceptions()) {
    assert(ex_map->jvms()->same_calls_as(_exceptions->jvms()), "all collected exceptions must come from the same place");
  }
#endif

  // If there is already an exception of exactly this type, merge with it.
  // In particular, null-checks and other low-level exceptions common up here.
  Node*       ex_oop  = saved_ex_oop(ex_map);
  const Type* ex_type = _gvn.type(ex_oop);
  if (ex_oop == top()) {
    // No action needed.
    return;
  }
  assert(ex_type->isa_instptr(), "exception must be an instance");
  for (SafePointNode* e2 = _exceptions; e2 != NULL; e2 = e2->next_exception()) {
    const Type* ex_type2 = _gvn.type(saved_ex_oop(e2));
    // We check sp also because call bytecodes can generate exceptions
    // both before and after arguments are popped!
    if (ex_type2 == ex_type
        && e2->_jvms->sp() == ex_map->_jvms->sp()) {
      combine_exception_states(ex_map, e2);
      return;
    }
  }

  // No pre-existing exception of the same type.  Chain it on the list.
  push_exception_state(ex_map);
}

//-----------------------add_exception_states_from-----------------------------
void GraphKit::add_exception_states_from(JVMState* jvms) {
  SafePointNode* ex_map = jvms->map()->next_exception();
  if (ex_map != NULL) {
    jvms->map()->set_next_exception(NULL);
    for (SafePointNode* next_map; ex_map != NULL; ex_map = next_map) {
      next_map = ex_map->next_exception();
      ex_map->set_next_exception(NULL);
      add_exception_state(ex_map);
    }
  }
}

//-----------------------transfer_exceptions_into_jvms-------------------------
JVMState* GraphKit::transfer_exceptions_into_jvms() {
  if (map() == NULL) {
    // We need a JVMS to carry the exceptions, but the map has gone away.
    // Create a scratch JVMS, cloned from any of the exception states...
    if (has_exceptions()) {
      _map = _exceptions;
      _map = clone_map();
      _map->set_next_exception(NULL);
      clear_saved_ex_oop(_map);
      debug_only(verify_map());
    } else {
      // ...or created from scratch
      JVMState* jvms = new (C) JVMState(_method, NULL);
      jvms->set_bci(_bci);
      jvms->set_sp(_sp);
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      jvms->set_map(new (C) SafePointNode(TypeFunc::Parms, jvms));
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      set_jvms(jvms);
      for (uint i = 0; i < map()->req(); i++)  map()->init_req(i, top());
      set_all_memory(top());
      while (map()->req() < jvms->endoff())  map()->add_req(top());
    }
    // (This is a kludge, in case you didn't notice.)
    set_control(top());
  }
  JVMState* jvms = sync_jvms();
  assert(!jvms->map()->has_exceptions(), "no exceptions on this map yet");
  jvms->map()->set_next_exception(_exceptions);
  _exceptions = NULL;   // done with this set of exceptions
  return jvms;
}

static inline void add_n_reqs(Node* dstphi, Node* srcphi) {
  assert(is_hidden_merge(dstphi), "must be a special merge node");
  assert(is_hidden_merge(srcphi), "must be a special merge node");
  uint limit = srcphi->req();
  for (uint i = PhiNode::Input; i < limit; i++) {
    dstphi->add_req(srcphi->in(i));
  }
}
static inline void add_one_req(Node* dstphi, Node* src) {
  assert(is_hidden_merge(dstphi), "must be a special merge node");
  assert(!is_hidden_merge(src), "must not be a special merge node");
  dstphi->add_req(src);
}

//-----------------------combine_exception_states------------------------------
// This helper function combines exception states by building phis on a
// specially marked state-merging region.  These regions and phis are
// untransformed, and can build up gradually.  The region is marked by
// having a control input of its exception map, rather than NULL.  Such
// regions do not appear except in this function, and in use_exception_state.
void GraphKit::combine_exception_states(SafePointNode* ex_map, SafePointNode* phi_map) {
  if (failing())  return;  // dying anyway...
  JVMState* ex_jvms = ex_map->_jvms;
  assert(ex_jvms->same_calls_as(phi_map->_jvms), "consistent call chains");
  assert(ex_jvms->stkoff() == phi_map->_jvms->stkoff(), "matching locals");
  assert(ex_jvms->sp() == phi_map->_jvms->sp(), "matching stack sizes");
  assert(ex_jvms->monoff() == phi_map->_jvms->monoff(), "matching JVMS");
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  assert(ex_jvms->scloff() == phi_map->_jvms->scloff(), "matching scalar replaced objects");
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  assert(ex_map->req() == phi_map->req(), "matching maps");
  uint tos = ex_jvms->stkoff() + ex_jvms->sp();
  Node*         hidden_merge_mark = root();
  Node*         region  = phi_map->control();
  MergeMemNode* phi_mem = phi_map->merged_memory();
  MergeMemNode* ex_mem  = ex_map->merged_memory();
  if (region->in(0) != hidden_merge_mark) {
    // The control input is not (yet) a specially-marked region in phi_map.
    // Make it so, and build some phis.
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    region = new (C) RegionNode(2);
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    _gvn.set_type(region, Type::CONTROL);
    region->set_req(0, hidden_merge_mark);  // marks an internal ex-state
    region->init_req(1, phi_map->control());
    phi_map->set_control(region);
    Node* io_phi = PhiNode::make(region, phi_map->i_o(), Type::ABIO);
    record_for_igvn(io_phi);
    _gvn.set_type(io_phi, Type::ABIO);
    phi_map->set_i_o(io_phi);
    for (MergeMemStream mms(phi_mem); mms.next_non_empty(); ) {
      Node* m = mms.memory();
      Node* m_phi = PhiNode::make(region, m, Type::MEMORY, mms.adr_type(C));
      record_for_igvn(m_phi);
      _gvn.set_type(m_phi, Type::MEMORY);
      mms.set_memory(m_phi);
    }
  }

  // Either or both of phi_map and ex_map might already be converted into phis.
  Node* ex_control = ex_map->control();
  // if there is special marking on ex_map also, we add multiple edges from src
  bool add_multiple = (ex_control->in(0) == hidden_merge_mark);
  // how wide was the destination phi_map, originally?
  uint orig_width = region->req();

  if (add_multiple) {
    add_n_reqs(region, ex_control);
    add_n_reqs(phi_map->i_o(), ex_map->i_o());
  } else {
    // ex_map has no merges, so we just add single edges everywhere
    add_one_req(region, ex_control);
    add_one_req(phi_map->i_o(), ex_map->i_o());
  }
  for (MergeMemStream mms(phi_mem, ex_mem); mms.next_non_empty2(); ) {
    if (mms.is_empty()) {
      // get a copy of the base memory, and patch some inputs into it
      const TypePtr* adr_type = mms.adr_type(C);
      Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type);
      assert(phi->as_Phi()->region() == mms.base_memory()->in(0), "");
      mms.set_memory(phi);
      // Prepare to append interesting stuff onto the newly sliced phi:
      while (phi->req() > orig_width)  phi->del_req(phi->req()-1);
    }
    // Append stuff from ex_map:
    if (add_multiple) {
      add_n_reqs(mms.memory(), mms.memory2());
    } else {
      add_one_req(mms.memory(), mms.memory2());
    }
  }
  uint limit = ex_map->req();
  for (uint i = TypeFunc::Parms; i < limit; i++) {
    // Skip everything in the JVMS after tos.  (The ex_oop follows.)
    if (i == tos)  i = ex_jvms->monoff();
    Node* src = ex_map->in(i);
    Node* dst = phi_map->in(i);
    if (src != dst) {
      PhiNode* phi;
      if (dst->in(0) != region) {
        dst = phi = PhiNode::make(region, dst, _gvn.type(dst));
        record_for_igvn(phi);
        _gvn.set_type(phi, phi->type());
        phi_map->set_req(i, dst);
        // Prepare to append interesting stuff onto the new phi:
        while (dst->req() > orig_width)  dst->del_req(dst->req()-1);
      } else {
        assert(dst->is_Phi(), "nobody else uses a hidden region");
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        phi = dst->as_Phi();
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      }
      if (add_multiple && src->in(0) == ex_control) {
        // Both are phis.
        add_n_reqs(dst, src);
      } else {
        while (dst->req() < region->req())  add_one_req(dst, src);
      }
      const Type* srctype = _gvn.type(src);
      if (phi->type() != srctype) {
        const Type* dsttype = phi->type()->meet(srctype);
        if (phi->type() != dsttype) {
          phi->set_type(dsttype);
          _gvn.set_type(phi, dsttype);
        }
      }
    }
  }
}

//--------------------------use_exception_state--------------------------------
Node* GraphKit::use_exception_state(SafePointNode* phi_map) {
  if (failing()) { stop(); return top(); }
  Node* region = phi_map->control();
  Node* hidden_merge_mark = root();
  assert(phi_map->jvms()->map() == phi_map, "sanity: 1-1 relation");
  Node* ex_oop = clear_saved_ex_oop(phi_map);
  if (region->in(0) == hidden_merge_mark) {
    // Special marking for internal ex-states.  Process the phis now.
    region->set_req(0, region);  // now it's an ordinary region
    set_jvms(phi_map->jvms());   // ...so now we can use it as a map
    // Note: Setting the jvms also sets the bci and sp.
    set_control(_gvn.transform(region));
    uint tos = jvms()->stkoff() + sp();
    for (uint i = 1; i < tos; i++) {
      Node* x = phi_map->in(i);
      if (x->in(0) == region) {
        assert(x->is_Phi(), "expected a special phi");
        phi_map->set_req(i, _gvn.transform(x));
      }
    }
    for (MergeMemStream mms(merged_memory()); mms.next_non_empty(); ) {
      Node* x = mms.memory();
      if (x->in(0) == region) {
        assert(x->is_Phi(), "nobody else uses a hidden region");
        mms.set_memory(_gvn.transform(x));
      }
    }
    if (ex_oop->in(0) == region) {
      assert(ex_oop->is_Phi(), "expected a special phi");
      ex_oop = _gvn.transform(ex_oop);
    }
  } else {
    set_jvms(phi_map->jvms());
  }

  assert(!is_hidden_merge(phi_map->control()), "hidden ex. states cleared");
  assert(!is_hidden_merge(phi_map->i_o()), "hidden ex. states cleared");
  return ex_oop;
}

//---------------------------------java_bc-------------------------------------
Bytecodes::Code GraphKit::java_bc() const {
  ciMethod* method = this->method();
  int       bci    = this->bci();
  if (method != NULL && bci != InvocationEntryBci)
    return method->java_code_at_bci(bci);
  else
    return Bytecodes::_illegal;
}

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void GraphKit::uncommon_trap_if_should_post_on_exceptions(Deoptimization::DeoptReason reason,
                                                          bool must_throw) {
    // if the exception capability is set, then we will generate code
    // to check the JavaThread.should_post_on_exceptions flag to see
    // if we actually need to report exception events (for this
    // thread).  If we don't need to report exception events, we will
    // take the normal fast path provided by add_exception_events.  If
    // exception event reporting is enabled for this thread, we will
    // take the uncommon_trap in the BuildCutout below.

    // first must access the should_post_on_exceptions_flag in this thread's JavaThread
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    Node* jthread = _gvn.transform(new (C) ThreadLocalNode());
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    Node* adr = basic_plus_adr(top(), jthread, in_bytes(JavaThread::should_post_on_exceptions_flag_offset()));
    Node* should_post_flag = make_load(control(), adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw, false);

    // Test the should_post_on_exceptions_flag vs. 0
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    Node* chk = _gvn.transform( new (C) CmpINode(should_post_flag, intcon(0)) );
    Node* tst = _gvn.transform( new (C) BoolNode(chk, BoolTest::eq) );
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    // Branch to slow_path if should_post_on_exceptions_flag was true
    { BuildCutout unless(this, tst, PROB_MAX);
      // Do not try anything fancy if we're notifying the VM on every throw.
      // Cf. case Bytecodes::_athrow in parse2.cpp.
      uncommon_trap(reason, Deoptimization::Action_none,
                    (ciKlass*)NULL, (char*)NULL, must_throw);
    }

}

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//------------------------------builtin_throw----------------------------------
void GraphKit::builtin_throw(Deoptimization::DeoptReason reason, Node* arg) {
  bool must_throw = true;

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  if (env()->jvmti_can_post_on_exceptions()) {
    // check if we must post exception events, take uncommon trap if so
    uncommon_trap_if_should_post_on_exceptions(reason, must_throw);
    // here if should_post_on_exceptions is false
    // continue on with the normal codegen
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  }

  // If this particular condition has not yet happened at this
  // bytecode, then use the uncommon trap mechanism, and allow for
  // a future recompilation if several traps occur here.
  // If the throw is hot, try to use a more complicated inline mechanism
  // which keeps execution inside the compiled code.
  bool treat_throw_as_hot = false;
  ciMethodData* md = method()->method_data();

  if (ProfileTraps) {
    if (too_many_traps(reason)) {
      treat_throw_as_hot = true;
    }
    // (If there is no MDO at all, assume it is early in
    // execution, and that any deopts are part of the
    // startup transient, and don't need to be remembered.)

    // Also, if there is a local exception handler, treat all throws
    // as hot if there has been at least one in this method.
    if (C->trap_count(reason) != 0
        && method()->method_data()->trap_count(reason) != 0
        && has_ex_handler()) {
        treat_throw_as_hot = true;
    }
  }

  // If this throw happens frequently, an uncommon trap might cause
  // a performance pothole.  If there is a local exception handler,
  // and if this particular bytecode appears to be deoptimizing often,
  // let us handle the throw inline, with a preconstructed instance.
  // Note:   If the deopt count has blown up, the uncommon trap
  // runtime is going to flush this nmethod, not matter what.
  if (treat_throw_as_hot
      && (!StackTraceInThrowable || OmitStackTraceInFastThrow)) {
    // If the throw is local, we use a pre-existing instance and
    // punt on the backtrace.  This would lead to a missing backtrace
    // (a repeat of 4292742) if the backtrace object is ever asked
    // for its backtrace.
    // Fixing this remaining case of 4292742 requires some flavor of
    // escape analysis.  Leave that for the future.
    ciInstance* ex_obj = NULL;
    switch (reason) {
    case Deoptimization::Reason_null_check:
      ex_obj = env()->NullPointerException_instance();
      break;
    case Deoptimization::Reason_div0_check:
      ex_obj = env()->ArithmeticException_instance();
      break;
    case Deoptimization::Reason_range_check:
      ex_obj = env()->ArrayIndexOutOfBoundsException_instance();
      break;
    case Deoptimization::Reason_class_check:
      if (java_bc() == Bytecodes::_aastore) {
        ex_obj = env()->ArrayStoreException_instance();
      } else {
        ex_obj = env()->ClassCastException_instance();
      }
      break;
    }
    if (failing()) { stop(); return; }  // exception allocation might fail
    if (ex_obj != NULL) {
      // Cheat with a preallocated exception object.
      if (C->log() != NULL)
        C->log()->elem("hot_throw preallocated='1' reason='%s'",
                       Deoptimization::trap_reason_name(reason));
      const TypeInstPtr* ex_con  = TypeInstPtr::make(ex_obj);
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      Node*              ex_node = _gvn.transform( ConNode::make(C, ex_con) );
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      // Clear the detail message of the preallocated exception object.
      // Weblogic sometimes mutates the detail message of exceptions
      // using reflection.
      int offset = java_lang_Throwable::get_detailMessage_offset();
      const TypePtr* adr_typ = ex_con->add_offset(offset);

      Node *adr = basic_plus_adr(ex_node, ex_node, offset);
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      const TypeOopPtr* val_type = TypeOopPtr::make_from_klass(env()->String_klass());
      Node *store = store_oop_to_object(control(), ex_node, adr, adr_typ, null(), val_type, T_OBJECT);
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      add_exception_state(make_exception_state(ex_node));
      return;
    }
  }

  // %%% Maybe add entry to OptoRuntime which directly throws the exc.?
  // It won't be much cheaper than bailing to the interp., since we'll
  // have to pass up all the debug-info, and the runtime will have to
  // create the stack trace.

  // Usual case:  Bail to interpreter.
  // Reserve the right to recompile if we haven't seen anything yet.

  Deoptimization::DeoptAction action = Deoptimization::Action_maybe_recompile;
  if (treat_throw_as_hot
      && (method()->method_data()->trap_recompiled_at(bci())
          || C->too_many_traps(reason))) {
    // We cannot afford to take more traps here.  Suffer in the interpreter.
    if (C->log() != NULL)
      C->log()->elem("hot_throw preallocated='0' reason='%s' mcount='%d'",
                     Deoptimization::trap_reason_name(reason),
                     C->trap_count(reason));
    action = Deoptimization::Action_none;
  }

  // "must_throw" prunes the JVM state to include only the stack, if there
  // are no local exception handlers.  This should cut down on register
  // allocation time and code size, by drastically reducing the number
  // of in-edges on the call to the uncommon trap.

  uncommon_trap(reason, action, (ciKlass*)NULL, (char*)NULL, must_throw);
}


//----------------------------PreserveJVMState---------------------------------
PreserveJVMState::PreserveJVMState(GraphKit* kit, bool clone_map) {
  debug_only(kit->verify_map());
  _kit    = kit;
  _map    = kit->map();   // preserve the map
  _sp     = kit->sp();
  kit->set_map(clone_map ? kit->clone_map() : NULL);
#ifdef ASSERT
  _bci    = kit->bci();
  Parse* parser = kit->is_Parse();
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  int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo();
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  _block  = block;
#endif
}
PreserveJVMState::~PreserveJVMState() {
  GraphKit* kit = _kit;
#ifdef ASSERT
  assert(kit->bci() == _bci, "bci must not shift");
  Parse* parser = kit->is_Parse();
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  int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo();
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  assert(block == _block,    "block must not shift");
#endif
  kit->set_map(_map);
  kit->set_sp(_sp);
}


//-----------------------------BuildCutout-------------------------------------
BuildCutout::BuildCutout(GraphKit* kit, Node* p, float prob, float cnt)
  : PreserveJVMState(kit)
{
  assert(p->is_Con() || p->is_Bool(), "test must be a bool");
  SafePointNode* outer_map = _map;   // preserved map is caller's
  SafePointNode* inner_map = kit->map();
  IfNode* iff = kit->create_and_map_if(outer_map->control(), p, prob, cnt);
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  outer_map->set_control(kit->gvn().transform( new (kit->C) IfTrueNode(iff) ));
  inner_map->set_control(kit->gvn().transform( new (kit->C) IfFalseNode(iff) ));
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}
BuildCutout::~BuildCutout() {
  GraphKit* kit = _kit;
  assert(kit->stopped(), "cutout code must stop, throw, return, etc.");
}

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//---------------------------PreserveReexecuteState----------------------------
PreserveReexecuteState::PreserveReexecuteState(GraphKit* kit) {
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  assert(!kit->stopped(), "must call stopped() before");
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  _kit    =    kit;
  _sp     =    kit->sp();
  _reexecute = kit->jvms()->_reexecute;
}
PreserveReexecuteState::~PreserveReexecuteState() {
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  if (_kit->stopped()) return;
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  _kit->jvms()->_reexecute = _reexecute;
  _kit->set_sp(_sp);
}
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//------------------------------clone_map--------------------------------------
// Implementation of PreserveJVMState
//
// Only clone_map(...) here. If this function is only used in the
// PreserveJVMState class we may want to get rid of this extra
// function eventually and do it all there.

SafePointNode* GraphKit::clone_map() {
  if (map() == NULL)  return NULL;

  // Clone the memory edge first
  Node* mem = MergeMemNode::make(C, map()->memory());
  gvn().set_type_bottom(mem);

  SafePointNode *clonemap = (SafePointNode*)map()->clone();
  JVMState* jvms = this->jvms();
  JVMState* clonejvms = jvms->clone_shallow(C);
  clonemap->set_memory(mem);
  clonemap->set_jvms(clonejvms);
  clonejvms->set_map(clonemap);
  record_for_igvn(clonemap);
  gvn().set_type_bottom(clonemap);
  return clonemap;
}


//-----------------------------set_map_clone-----------------------------------
void GraphKit::set_map_clone(SafePointNode* m) {
  _map = m;
  _map = clone_map();
  _map->set_next_exception(NULL);
  debug_only(verify_map());
}


//----------------------------kill_dead_locals---------------------------------
// Detect any locals which are known to be dead, and force them to top.
void GraphKit::kill_dead_locals() {
  // Consult the liveness information for the locals.  If any
  // of them are unused, then they can be replaced by top().  This
  // should help register allocation time and cut down on the size
  // of the deoptimization information.

  // This call is made from many of the bytecode handling
  // subroutines called from the Big Switch in do_one_bytecode.
  // Every bytecode which might include a slow path is responsible
  // for killing its dead locals.  The more consistent we
  // are about killing deads, the fewer useless phis will be
  // constructed for them at various merge points.

  // bci can be -1 (InvocationEntryBci).  We return the entry
  // liveness for the method.

  if (method() == NULL || method()->code_size() == 0) {
    // We are building a graph for a call to a native method.
    // All locals are live.
    return;
  }

  ResourceMark rm;

  // Consult the liveness information for the locals.  If any
  // of them are unused, then they can be replaced by top().  This
  // should help register allocation time and cut down on the size
  // of the deoptimization information.
  MethodLivenessResult live_locals = method()->liveness_at_bci(bci());

  int len = (int)live_locals.size();
  assert(len <= jvms()->loc_size(), "too many live locals");
  for (int local = 0; local < len; local++) {
    if (!live_locals.at(local)) {
      set_local(local, top());
    }
  }
}

#ifdef ASSERT
//-------------------------dead_locals_are_killed------------------------------
// Return true if all dead locals are set to top in the map.
// Used to assert "clean" debug info at various points.
bool GraphKit::dead_locals_are_killed() {
  if (method() == NULL || method()->code_size() == 0) {
    // No locals need to be dead, so all is as it should be.
    return true;
  }

  // Make sure somebody called kill_dead_locals upstream.
  ResourceMark rm;
  for (JVMState* jvms = this->jvms(); jvms != NULL; jvms = jvms->caller()) {
    if (jvms->loc_size() == 0)  continue;  // no locals to consult
    SafePointNode* map = jvms->map();
    ciMethod* method = jvms->method();
    int       bci    = jvms->bci();
    if (jvms == this->jvms()) {
      bci = this->bci();  // it might not yet be synched
    }
    MethodLivenessResult live_locals = method->liveness_at_bci(bci);
    int len = (int)live_locals.size();
    if (!live_locals.is_valid() || len == 0)
      // This method is trivial, or is poisoned by a breakpoint.
      return true;
    assert(len == jvms->loc_size(), "live map consistent with locals map");
    for (int local = 0; local < len; local++) {
      if (!live_locals.at(local) && map->local(jvms, local) != top()) {
        if (PrintMiscellaneous && (Verbose || WizardMode)) {
          tty->print_cr("Zombie local %d: ", local);
          jvms->dump();
        }
        return false;
      }
    }
  }
  return true;
}

#endif //ASSERT

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// Helper function for enforcing certain bytecodes to reexecute if
// deoptimization happens
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static bool should_reexecute_implied_by_bytecode(JVMState *jvms, bool is_anewarray) {
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  ciMethod* cur_method = jvms->method();
  int       cur_bci   = jvms->bci();
  if (cur_method != NULL && cur_bci != InvocationEntryBci) {
    Bytecodes::Code code = cur_method->java_code_at_bci(cur_bci);
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    return Interpreter::bytecode_should_reexecute(code) ||
           is_anewarray && code == Bytecodes::_multianewarray;
    // Reexecute _multianewarray bytecode which was replaced with
    // sequence of [a]newarray. See Parse::do_multianewarray().
    //
    // Note: interpreter should not have it set since this optimization
    // is limited by dimensions and guarded by flag so in some cases
    // multianewarray() runtime calls will be generated and
    // the bytecode should not be reexecutes (stack will not be reset).
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  } else
    return false;
}

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// Helper function for adding JVMState and debug information to node
void GraphKit::add_safepoint_edges(SafePointNode* call, bool must_throw) {
  // Add the safepoint edges to the call (or other safepoint).

  // Make sure dead locals are set to top.  This
  // should help register allocation time and cut down on the size
  // of the deoptimization information.
  assert(dead_locals_are_killed(), "garbage in debug info before safepoint");

  // Walk the inline list to fill in the correct set of JVMState's
  // Also fill in the associated edges for each JVMState.

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  // If the bytecode needs to be reexecuted we need to put
  // the arguments back on the stack.
  const bool should_reexecute = jvms()->should_reexecute();
  JVMState* youngest_jvms = should_reexecute ? sync_jvms_for_reexecute() : sync_jvms();

  // NOTE: set_bci (called from sync_jvms) might reset the reexecute bit to
  // undefined if the bci is different.  This is normal for Parse but it
  // should not happen for LibraryCallKit because only one bci is processed.
  assert(!is_LibraryCallKit() || (jvms()->should_reexecute() == should_reexecute),
         "in LibraryCallKit the reexecute bit should not change");
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  // If we are guaranteed to throw, we can prune everything but the
  // input to the current bytecode.
  bool can_prune_locals = false;
  uint stack_slots_not_pruned = 0;
  int inputs = 0, depth = 0;
  if (must_throw) {
    assert(method() == youngest_jvms->method(), "sanity");
    if (compute_stack_effects(inputs, depth)) {
      can_prune_locals = true;
      stack_slots_not_pruned = inputs;
    }
  }

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  if (env()->jvmti_can_access_local_variables()) {
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    // At any safepoint, this method can get breakpointed, which would
    // then require an immediate deoptimization.
    can_prune_locals = false;  // do not prune locals
    stack_slots_not_pruned = 0;
  }

  // do not scribble on the input jvms
  JVMState* out_jvms = youngest_jvms->clone_deep(C);
  call->set_jvms(out_jvms); // Start jvms list for call node

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  // For a known set of bytecodes, the interpreter should reexecute them if
  // deoptimization happens. We set the reexecute state for them here
  if (out_jvms->is_reexecute_undefined() && //don't change if already specified
878
      should_reexecute_implied_by_bytecode(out_jvms, call->is_AllocateArray())) {
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    out_jvms->set_should_reexecute(true); //NOTE: youngest_jvms not changed
  }

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  // Presize the call:
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  DEBUG_ONLY(uint non_debug_edges = call->req());
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  call->add_req_batch(top(), youngest_jvms->debug_depth());
  assert(call->req() == non_debug_edges + youngest_jvms->debug_depth(), "");

  // Set up edges so that the call looks like this:
  //  Call [state:] ctl io mem fptr retadr
  //       [parms:] parm0 ... parmN
  //       [root:]  loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN
  //    [...mid:]   loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN [...]
  //       [young:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN
  // Note that caller debug info precedes callee debug info.

  // Fill pointer walks backwards from "young:" to "root:" in the diagram above:
  uint debug_ptr = call->req();

  // Loop over the map input edges associated with jvms, add them
  // to the call node, & reset all offsets to match call node array.
  for (JVMState* in_jvms = youngest_jvms; in_jvms != NULL; ) {
    uint debug_end   = debug_ptr;
    uint debug_start = debug_ptr - in_jvms->debug_size();
    debug_ptr = debug_start;  // back up the ptr

    uint p = debug_start;  // walks forward in [debug_start, debug_end)
    uint j, k, l;
    SafePointNode* in_map = in_jvms->map();
    out_jvms->set_map(call);

    if (can_prune_locals) {
      assert(in_jvms->method() == out_jvms->method(), "sanity");
      // If the current throw can reach an exception handler in this JVMS,
      // then we must keep everything live that can reach that handler.
      // As a quick and dirty approximation, we look for any handlers at all.
      if (in_jvms->method()->has_exception_handlers()) {
        can_prune_locals = false;
      }
    }

    // Add the Locals
    k = in_jvms->locoff();
    l = in_jvms->loc_size();
    out_jvms->set_locoff(p);
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    if (!can_prune_locals) {
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      for (j = 0; j < l; j++)
        call->set_req(p++, in_map->in(k+j));
    } else {
      p += l;  // already set to top above by add_req_batch
    }

    // Add the Expression Stack
    k = in_jvms->stkoff();
    l = in_jvms->sp();
    out_jvms->set_stkoff(p);
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    if (!can_prune_locals) {
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      for (j = 0; j < l; j++)
        call->set_req(p++, in_map->in(k+j));
    } else if (can_prune_locals && stack_slots_not_pruned != 0) {
      // Divide stack into {S0,...,S1}, where S0 is set to top.
      uint s1 = stack_slots_not_pruned;
      stack_slots_not_pruned = 0;  // for next iteration
      if (s1 > l)  s1 = l;
      uint s0 = l - s1;
      p += s0;  // skip the tops preinstalled by add_req_batch
      for (j = s0; j < l; j++)
        call->set_req(p++, in_map->in(k+j));
    } else {
      p += l;  // already set to top above by add_req_batch
    }

    // Add the Monitors
    k = in_jvms->monoff();
    l = in_jvms->mon_size();
    out_jvms->set_monoff(p);
    for (j = 0; j < l; j++)
      call->set_req(p++, in_map->in(k+j));

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    // Copy any scalar object fields.
    k = in_jvms->scloff();
    l = in_jvms->scl_size();
    out_jvms->set_scloff(p);
    for (j = 0; j < l; j++)
      call->set_req(p++, in_map->in(k+j));

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    // Finish the new jvms.
    out_jvms->set_endoff(p);

    assert(out_jvms->endoff()     == debug_end,             "fill ptr must match");
    assert(out_jvms->depth()      == in_jvms->depth(),      "depth must match");
    assert(out_jvms->loc_size()   == in_jvms->loc_size(),   "size must match");
    assert(out_jvms->mon_size()   == in_jvms->mon_size(),   "size must match");
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    assert(out_jvms->scl_size()   == in_jvms->scl_size(),   "size must match");
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    assert(out_jvms->debug_size() == in_jvms->debug_size(), "size must match");

    // Update the two tail pointers in parallel.
    out_jvms = out_jvms->caller();
    in_jvms  = in_jvms->caller();
  }

  assert(debug_ptr == non_debug_edges, "debug info must fit exactly");

  // Test the correctness of JVMState::debug_xxx accessors:
  assert(call->jvms()->debug_start() == non_debug_edges, "");
  assert(call->jvms()->debug_end()   == call->req(), "");
  assert(call->jvms()->debug_depth() == call->req() - non_debug_edges, "");
}

988
bool GraphKit::compute_stack_effects(int& inputs, int& depth) {
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  Bytecodes::Code code = java_bc();
  if (code == Bytecodes::_wide) {
    code = method()->java_code_at_bci(bci() + 1);
  }

  BasicType rtype = T_ILLEGAL;
  int       rsize = 0;

  if (code != Bytecodes::_illegal) {
    depth = Bytecodes::depth(code); // checkcast=0, athrow=-1
    rtype = Bytecodes::result_type(code); // checkcast=P, athrow=V
    if (rtype < T_CONFLICT)
      rsize = type2size[rtype];
  }

  switch (code) {
  case Bytecodes::_illegal:
    return false;

  case Bytecodes::_ldc:
  case Bytecodes::_ldc_w:
  case Bytecodes::_ldc2_w:
    inputs = 0;
    break;

  case Bytecodes::_dup:         inputs = 1;  break;
  case Bytecodes::_dup_x1:      inputs = 2;  break;
  case Bytecodes::_dup_x2:      inputs = 3;  break;
  case Bytecodes::_dup2:        inputs = 2;  break;
  case Bytecodes::_dup2_x1:     inputs = 3;  break;
  case Bytecodes::_dup2_x2:     inputs = 4;  break;
  case Bytecodes::_swap:        inputs = 2;  break;
  case Bytecodes::_arraylength: inputs = 1;  break;

  case Bytecodes::_getstatic:
  case Bytecodes::_putstatic:
  case Bytecodes::_getfield:
  case Bytecodes::_putfield:
    {
1028
      bool ignored_will_link;
1029
      ciField* field = method()->get_field_at_bci(bci(), ignored_will_link);
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      int      size  = field->type()->size();
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      bool is_get = (depth >= 0), is_static = (depth & 1);
      inputs = (is_static ? 0 : 1);
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      if (is_get) {
        depth = size - inputs;
      } else {
        inputs += size;        // putxxx pops the value from the stack
        depth = - inputs;
      }
    }
    break;

  case Bytecodes::_invokevirtual:
  case Bytecodes::_invokespecial:
  case Bytecodes::_invokestatic:
1045
  case Bytecodes::_invokedynamic:
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  case Bytecodes::_invokeinterface:
    {
1048 1049
      bool ignored_will_link;
      ciSignature* declared_signature = NULL;
1050
      ciMethod* ignored_callee = method()->get_method_at_bci(bci(), ignored_will_link, &declared_signature);
1051
      assert(declared_signature != NULL, "cannot be null");
1052
      inputs   = declared_signature->arg_size_for_bc(code);
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      int size = declared_signature->return_type()->size();
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      depth = size - inputs;
    }
    break;

  case Bytecodes::_multianewarray:
    {
      ciBytecodeStream iter(method());
      iter.reset_to_bci(bci());
      iter.next();
      inputs = iter.get_dimensions();
      assert(rsize == 1, "");
      depth = rsize - inputs;
    }
    break;

  case Bytecodes::_ireturn:
  case Bytecodes::_lreturn:
  case Bytecodes::_freturn:
  case Bytecodes::_dreturn:
  case Bytecodes::_areturn:
    assert(rsize = -depth, "");
    inputs = rsize;
    break;

  case Bytecodes::_jsr:
  case Bytecodes::_jsr_w:
    inputs = 0;
    depth  = 1;                  // S.B. depth=1, not zero
    break;

  default:
    // bytecode produces a typed result
    inputs = rsize - depth;
    assert(inputs >= 0, "");
    break;
  }

#ifdef ASSERT
  // spot check
  int outputs = depth + inputs;
  assert(outputs >= 0, "sanity");
  switch (code) {
  case Bytecodes::_checkcast: assert(inputs == 1 && outputs == 1, ""); break;
  case Bytecodes::_athrow:    assert(inputs == 1 && outputs == 0, ""); break;
  case Bytecodes::_aload_0:   assert(inputs == 0 && outputs == 1, ""); break;
  case Bytecodes::_return:    assert(inputs == 0 && outputs == 0, ""); break;
  case Bytecodes::_drem:      assert(inputs == 4 && outputs == 2, ""); break;
  }
#endif //ASSERT

  return true;
}



//------------------------------basic_plus_adr---------------------------------
Node* GraphKit::basic_plus_adr(Node* base, Node* ptr, Node* offset) {
  // short-circuit a common case
  if (offset == intcon(0))  return ptr;
1113
  return _gvn.transform( new (C) AddPNode(base, ptr, offset) );
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}

Node* GraphKit::ConvI2L(Node* offset) {
  // short-circuit a common case
  jint offset_con = find_int_con(offset, Type::OffsetBot);
  if (offset_con != Type::OffsetBot) {
1120
    return longcon((jlong) offset_con);
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  }
1122
  return _gvn.transform( new (C) ConvI2LNode(offset));
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}
Node* GraphKit::ConvL2I(Node* offset) {
  // short-circuit a common case
  jlong offset_con = find_long_con(offset, (jlong)Type::OffsetBot);
  if (offset_con != (jlong)Type::OffsetBot) {
    return intcon((int) offset_con);
  }
1130
  return _gvn.transform( new (C) ConvL2INode(offset));
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}

//-------------------------load_object_klass-----------------------------------
Node* GraphKit::load_object_klass(Node* obj) {
  // Special-case a fresh allocation to avoid building nodes:
  Node* akls = AllocateNode::Ideal_klass(obj, &_gvn);
  if (akls != NULL)  return akls;
  Node* k_adr = basic_plus_adr(obj, oopDesc::klass_offset_in_bytes());
1139
  return _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), k_adr, TypeInstPtr::KLASS) );
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}

//-------------------------load_array_length-----------------------------------
Node* GraphKit::load_array_length(Node* array) {
  // Special-case a fresh allocation to avoid building nodes:
1145 1146 1147 1148
  AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(array, &_gvn);
  Node *alen;
  if (alloc == NULL) {
    Node *r_adr = basic_plus_adr(array, arrayOopDesc::length_offset_in_bytes());
1149
    alen = _gvn.transform( new (C) LoadRangeNode(0, immutable_memory(), r_adr, TypeInt::POS));
1150 1151
  } else {
    alen = alloc->Ideal_length();
1152
    Node* ccast = alloc->make_ideal_length(_gvn.type(array)->is_oopptr(), &_gvn);
1153 1154 1155 1156 1157
    if (ccast != alen) {
      alen = _gvn.transform(ccast);
    }
  }
  return alen;
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}

//------------------------------do_null_check----------------------------------
// Helper function to do a NULL pointer check.  Returned value is
// the incoming address with NULL casted away.  You are allowed to use the
// not-null value only if you are control dependent on the test.
extern int explicit_null_checks_inserted,
           explicit_null_checks_elided;
Node* GraphKit::null_check_common(Node* value, BasicType type,
                                  // optional arguments for variations:
                                  bool assert_null,
                                  Node* *null_control) {
  assert(!assert_null || null_control == NULL, "not both at once");
  if (stopped())  return top();
  if (!GenerateCompilerNullChecks && !assert_null && null_control == NULL) {
    // For some performance testing, we may wish to suppress null checking.
    value = cast_not_null(value);   // Make it appear to be non-null (4962416).
    return value;
  }
  explicit_null_checks_inserted++;

  // Construct NULL check
  Node *chk = NULL;
  switch(type) {
1182
    case T_LONG   : chk = new (C) CmpLNode(value, _gvn.zerocon(T_LONG)); break;
1183
    case T_INT    : chk = new (C) CmpINode(value, _gvn.intcon(0)); break;
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    case T_ARRAY  : // fall through
      type = T_OBJECT;  // simplify further tests
    case T_OBJECT : {
      const Type *t = _gvn.type( value );

1189
      const TypeOopPtr* tp = t->isa_oopptr();
1190
      if (tp != NULL && tp->klass() != NULL && !tp->klass()->is_loaded()
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          // Only for do_null_check, not any of its siblings:
          && !assert_null && null_control == NULL) {
        // Usually, any field access or invocation on an unloaded oop type
        // will simply fail to link, since the statically linked class is
        // likely also to be unloaded.  However, in -Xcomp mode, sometimes
        // the static class is loaded but the sharper oop type is not.
        // Rather than checking for this obscure case in lots of places,
        // we simply observe that a null check on an unloaded class
        // will always be followed by a nonsense operation, so we
        // can just issue the uncommon trap here.
        // Our access to the unloaded class will only be correct
        // after it has been loaded and initialized, which requires
        // a trip through the interpreter.
#ifndef PRODUCT
        if (WizardMode) { tty->print("Null check of unloaded "); tp->klass()->print(); tty->cr(); }
#endif
        uncommon_trap(Deoptimization::Reason_unloaded,
                      Deoptimization::Action_reinterpret,
                      tp->klass(), "!loaded");
        return top();
      }

      if (assert_null) {
        // See if the type is contained in NULL_PTR.
        // If so, then the value is already null.
        if (t->higher_equal(TypePtr::NULL_PTR)) {
          explicit_null_checks_elided++;
          return value;           // Elided null assert quickly!
        }
      } else {
        // See if mixing in the NULL pointer changes type.
        // If so, then the NULL pointer was not allowed in the original
        // type.  In other words, "value" was not-null.
        if (t->meet(TypePtr::NULL_PTR) != t) {
          // same as: if (!TypePtr::NULL_PTR->higher_equal(t)) ...
          explicit_null_checks_elided++;
          return value;           // Elided null check quickly!
        }
      }
1230
      chk = new (C) CmpPNode( value, null() );
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      break;
    }

1234 1235
    default:
      fatal(err_msg_res("unexpected type: %s", type2name(type)));
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  }
  assert(chk != NULL, "sanity check");
  chk = _gvn.transform(chk);

  BoolTest::mask btest = assert_null ? BoolTest::eq : BoolTest::ne;
1241
  BoolNode *btst = new (C) BoolNode( chk, btest);
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  Node   *tst = _gvn.transform( btst );

  //-----------
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  // if peephole optimizations occurred, a prior test existed.
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  // If a prior test existed, maybe it dominates as we can avoid this test.
  if (tst != btst && type == T_OBJECT) {
    // At this point we want to scan up the CFG to see if we can
    // find an identical test (and so avoid this test altogether).
    Node *cfg = control();
    int depth = 0;
    while( depth < 16 ) {       // Limit search depth for speed
      if( cfg->Opcode() == Op_IfTrue &&
          cfg->in(0)->in(1) == tst ) {
        // Found prior test.  Use "cast_not_null" to construct an identical
        // CastPP (and hence hash to) as already exists for the prior test.
        // Return that casted value.
        if (assert_null) {
          replace_in_map(value, null());
          return null();  // do not issue the redundant test
        }
        Node *oldcontrol = control();
        set_control(cfg);
        Node *res = cast_not_null(value);
        set_control(oldcontrol);
        explicit_null_checks_elided++;
        return res;
      }
      cfg = IfNode::up_one_dom(cfg, /*linear_only=*/ true);
      if (cfg == NULL)  break;  // Quit at region nodes
      depth++;
    }
  }

  //-----------
  // Branch to failure if null
  float ok_prob = PROB_MAX;  // a priori estimate:  nulls never happen
  Deoptimization::DeoptReason reason;
  if (assert_null)
    reason = Deoptimization::Reason_null_assert;
  else if (type == T_OBJECT)
    reason = Deoptimization::Reason_null_check;
  else
    reason = Deoptimization::Reason_div0_check;

1286 1287 1288 1289 1290 1291
  // %%% Since Reason_unhandled is not recorded on a per-bytecode basis,
  // ciMethodData::has_trap_at will return a conservative -1 if any
  // must-be-null assertion has failed.  This could cause performance
  // problems for a method after its first do_null_assert failure.
  // Consider using 'Reason_class_check' instead?

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  // To cause an implicit null check, we set the not-null probability
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  // to the maximum (PROB_MAX).  For an explicit check the probability
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  // is set to a smaller value.
  if (null_control != NULL || too_many_traps(reason)) {
    // probability is less likely
    ok_prob =  PROB_LIKELY_MAG(3);
  } else if (!assert_null &&
             (ImplicitNullCheckThreshold > 0) &&
             method() != NULL &&
             (method()->method_data()->trap_count(reason)
              >= (uint)ImplicitNullCheckThreshold)) {
    ok_prob =  PROB_LIKELY_MAG(3);
  }

  if (null_control != NULL) {
    IfNode* iff = create_and_map_if(control(), tst, ok_prob, COUNT_UNKNOWN);
1308 1309
    Node* null_true = _gvn.transform( new (C) IfFalseNode(iff));
    set_control(      _gvn.transform( new (C) IfTrueNode(iff)));
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    if (null_true == top())
      explicit_null_checks_elided++;
    (*null_control) = null_true;
  } else {
    BuildCutout unless(this, tst, ok_prob);
    // Check for optimizer eliding test at parse time
    if (stopped()) {
      // Failure not possible; do not bother making uncommon trap.
      explicit_null_checks_elided++;
    } else if (assert_null) {
      uncommon_trap(reason,
                    Deoptimization::Action_make_not_entrant,
                    NULL, "assert_null");
    } else {
1324
      replace_in_map(value, zerocon(type));
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      builtin_throw(reason);
    }
  }

  // Must throw exception, fall-thru not possible?
  if (stopped()) {
    return top();               // No result
  }

  if (assert_null) {
    // Cast obj to null on this path.
    replace_in_map(value, zerocon(type));
    return zerocon(type);
  }

  // Cast obj to not-null on this path, if there is no null_control.
  // (If there is a null_control, a non-null value may come back to haunt us.)
  if (type == T_OBJECT) {
    Node* cast = cast_not_null(value, false);
    if (null_control == NULL || (*null_control) == top())
      replace_in_map(value, cast);
    value = cast;
  }

  return value;
}


//------------------------------cast_not_null----------------------------------
// Cast obj to not-null on this path
Node* GraphKit::cast_not_null(Node* obj, bool do_replace_in_map) {
  const Type *t = _gvn.type(obj);
  const Type *t_not_null = t->join(TypePtr::NOTNULL);
  // Object is already not-null?
  if( t == t_not_null ) return obj;

1361
  Node *cast = new (C) CastPPNode(obj,t_not_null);
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  cast->init_req(0, control());
  cast = _gvn.transform( cast );

  // Scan for instances of 'obj' in the current JVM mapping.
  // These instances are known to be not-null after the test.
  if (do_replace_in_map)
    replace_in_map(obj, cast);

  return cast;                  // Return casted value
}


//--------------------------replace_in_map-------------------------------------
void GraphKit::replace_in_map(Node* old, Node* neww) {
  this->map()->replace_edge(old, neww);

  // Note: This operation potentially replaces any edge
  // on the map.  This includes locals, stack, and monitors
  // of the current (innermost) JVM state.

  // We can consider replacing in caller maps.
  // The idea would be that an inlined function's null checks
  // can be shared with the entire inlining tree.
  // The expense of doing this is that the PreserveJVMState class
  // would have to preserve caller states too, with a deep copy.
}


//=============================================================================
//--------------------------------memory---------------------------------------
Node* GraphKit::memory(uint alias_idx) {
  MergeMemNode* mem = merged_memory();
  Node* p = mem->memory_at(alias_idx);
  _gvn.set_type(p, Type::MEMORY);  // must be mapped
  return p;
}

//-----------------------------reset_memory------------------------------------
Node* GraphKit::reset_memory() {
  Node* mem = map()->memory();
  // do not use this node for any more parsing!
  debug_only( map()->set_memory((Node*)NULL) );
  return _gvn.transform( mem );
}

//------------------------------set_all_memory---------------------------------
void GraphKit::set_all_memory(Node* newmem) {
  Node* mergemem = MergeMemNode::make(C, newmem);
  gvn().set_type_bottom(mergemem);
  map()->set_memory(mergemem);
}

//------------------------------set_all_memory_call----------------------------
1415
void GraphKit::set_all_memory_call(Node* call, bool separate_io_proj) {
1416
  Node* newmem = _gvn.transform( new (C) ProjNode(call, TypeFunc::Memory, separate_io_proj) );
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  set_all_memory(newmem);
}

//=============================================================================
//
// parser factory methods for MemNodes
//
// These are layered on top of the factory methods in LoadNode and StoreNode,
// and integrate with the parser's memory state and _gvn engine.
//

// factory methods in "int adr_idx"
Node* GraphKit::make_load(Node* ctl, Node* adr, const Type* t, BasicType bt,
                          int adr_idx,
                          bool require_atomic_access) {
  assert(adr_idx != Compile::AliasIdxTop, "use other make_load factory" );
  const TypePtr* adr_type = NULL; // debug-mode-only argument
  debug_only(adr_type = C->get_adr_type(adr_idx));
  Node* mem = memory(adr_idx);
  Node* ld;
  if (require_atomic_access && bt == T_LONG) {
    ld = LoadLNode::make_atomic(C, ctl, mem, adr, adr_type, t);
  } else {
1440
    ld = LoadNode::make(_gvn, ctl, mem, adr, adr_type, t, bt);
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  }
1442 1443 1444 1445 1446 1447
  ld = _gvn.transform(ld);
  if ((bt == T_OBJECT) && C->do_escape_analysis() || C->eliminate_boxing()) {
    // Improve graph before escape analysis and boxing elimination.
    record_for_igvn(ld);
  }
  return ld;
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}

Node* GraphKit::store_to_memory(Node* ctl, Node* adr, Node *val, BasicType bt,
                                int adr_idx,
                                bool require_atomic_access) {
  assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" );
  const TypePtr* adr_type = NULL;
  debug_only(adr_type = C->get_adr_type(adr_idx));
  Node *mem = memory(adr_idx);
  Node* st;
  if (require_atomic_access && bt == T_LONG) {
    st = StoreLNode::make_atomic(C, ctl, mem, adr, adr_type, val);
  } else {
1461
    st = StoreNode::make(_gvn, ctl, mem, adr, adr_type, val, bt);
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  }
  st = _gvn.transform(st);
  set_memory(st, adr_idx);
  // Back-to-back stores can only remove intermediate store with DU info
  // so push on worklist for optimizer.
  if (mem->req() > MemNode::Address && adr == mem->in(MemNode::Address))
    record_for_igvn(st);

  return st;
}

1473

1474 1475
void GraphKit::pre_barrier(bool do_load,
                           Node* ctl,
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                           Node* obj,
                           Node* adr,
1478 1479
                           uint  adr_idx,
                           Node* val,
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                           const TypeOopPtr* val_type,
1481
                           Node* pre_val,
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                           BasicType bt) {
1483

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  BarrierSet* bs = Universe::heap()->barrier_set();
  set_control(ctl);
  switch (bs->kind()) {
1487 1488
    case BarrierSet::G1SATBCT:
    case BarrierSet::G1SATBCTLogging:
1489
      g1_write_barrier_pre(do_load, obj, adr, adr_idx, val, val_type, pre_val, bt);
1490
      break;
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    case BarrierSet::CardTableModRef:
    case BarrierSet::CardTableExtension:
    case BarrierSet::ModRef:
      break;

    case BarrierSet::Other:
    default      :
      ShouldNotReachHere();

  }
}

1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522
bool GraphKit::can_move_pre_barrier() const {
  BarrierSet* bs = Universe::heap()->barrier_set();
  switch (bs->kind()) {
    case BarrierSet::G1SATBCT:
    case BarrierSet::G1SATBCTLogging:
      return true; // Can move it if no safepoint

    case BarrierSet::CardTableModRef:
    case BarrierSet::CardTableExtension:
    case BarrierSet::ModRef:
      return true; // There is no pre-barrier

    case BarrierSet::Other:
    default      :
      ShouldNotReachHere();
  }
  return false;
}

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void GraphKit::post_barrier(Node* ctl,
                            Node* store,
                            Node* obj,
                            Node* adr,
1527 1528
                            uint  adr_idx,
                            Node* val,
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                            BasicType bt,
                            bool use_precise) {
  BarrierSet* bs = Universe::heap()->barrier_set();
  set_control(ctl);
  switch (bs->kind()) {
1534 1535
    case BarrierSet::G1SATBCT:
    case BarrierSet::G1SATBCTLogging:
1536
      g1_write_barrier_post(store, obj, adr, adr_idx, val, bt, use_precise);
1537
      break;
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    case BarrierSet::CardTableModRef:
    case BarrierSet::CardTableExtension:
1541
      write_barrier_post(store, obj, adr, adr_idx, val, use_precise);
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      break;

    case BarrierSet::ModRef:
      break;

    case BarrierSet::Other:
    default      :
      ShouldNotReachHere();

  }
}

1554 1555 1556 1557 1558 1559 1560 1561
Node* GraphKit::store_oop(Node* ctl,
                          Node* obj,
                          Node* adr,
                          const TypePtr* adr_type,
                          Node* val,
                          const TypeOopPtr* val_type,
                          BasicType bt,
                          bool use_precise) {
1562 1563 1564 1565 1566
  // Transformation of a value which could be NULL pointer (CastPP #NULL)
  // could be delayed during Parse (for example, in adjust_map_after_if()).
  // Execute transformation here to avoid barrier generation in such case.
  if (_gvn.type(val) == TypePtr::NULL_PTR)
    val = _gvn.makecon(TypePtr::NULL_PTR);
1567 1568 1569

  set_control(ctl);
  if (stopped()) return top(); // Dead path ?
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1571 1572
  assert(bt == T_OBJECT, "sanity");
  assert(val != NULL, "not dead path");
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  uint adr_idx = C->get_alias_index(adr_type);
1574 1575
  assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" );

1576 1577 1578 1579 1580
  pre_barrier(true /* do_load */,
              control(), obj, adr, adr_idx, val, val_type,
              NULL /* pre_val */,
              bt);

1581 1582
  Node* store = store_to_memory(control(), adr, val, bt, adr_idx);
  post_barrier(control(), store, obj, adr, adr_idx, val, bt, use_precise);
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  return store;
}

1586
// Could be an array or object we don't know at compile time (unsafe ref.)
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Node* GraphKit::store_oop_to_unknown(Node* ctl,
1588 1589 1590 1591 1592
                             Node* obj,   // containing obj
                             Node* adr,  // actual adress to store val at
                             const TypePtr* adr_type,
                             Node* val,
                             BasicType bt) {
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  Compile::AliasType* at = C->alias_type(adr_type);
  const TypeOopPtr* val_type = NULL;
  if (adr_type->isa_instptr()) {
    if (at->field() != NULL) {
      // known field.  This code is a copy of the do_put_xxx logic.
      ciField* field = at->field();
      if (!field->type()->is_loaded()) {
        val_type = TypeInstPtr::BOTTOM;
      } else {
        val_type = TypeOopPtr::make_from_klass(field->type()->as_klass());
      }
    }
  } else if (adr_type->isa_aryptr()) {
1606
    val_type = adr_type->is_aryptr()->elem()->make_oopptr();
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  }
  if (val_type == NULL) {
    val_type = TypeInstPtr::BOTTOM;
  }
1611
  return store_oop(ctl, obj, adr, adr_type, val, val_type, bt, true);
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}


//-------------------------array_element_address-------------------------
Node* GraphKit::array_element_address(Node* ary, Node* idx, BasicType elembt,
                                      const TypeInt* sizetype) {
1618
  uint shift  = exact_log2(type2aelembytes(elembt));
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  uint header = arrayOopDesc::base_offset_in_bytes(elembt);

  // short-circuit a common case (saves lots of confusing waste motion)
  jint idx_con = find_int_con(idx, -1);
  if (idx_con >= 0) {
    intptr_t offset = header + ((intptr_t)idx_con << shift);
    return basic_plus_adr(ary, offset);
  }

  // must be correct type for alignment purposes
  Node* base  = basic_plus_adr(ary, header);
#ifdef _LP64
  // The scaled index operand to AddP must be a clean 64-bit value.
  // Java allows a 32-bit int to be incremented to a negative
  // value, which appears in a 64-bit register as a large
  // positive number.  Using that large positive number as an
  // operand in pointer arithmetic has bad consequences.
  // On the other hand, 32-bit overflow is rare, and the possibility
  // can often be excluded, if we annotate the ConvI2L node with
  // a type assertion that its value is known to be a small positive
  // number.  (The prior range check has ensured this.)
  // This assertion is used by ConvI2LNode::Ideal.
  int index_max = max_jint - 1;  // array size is max_jint, index is one less
  if (sizetype != NULL)  index_max = sizetype->_hi - 1;
  const TypeLong* lidxtype = TypeLong::make(CONST64(0), index_max, Type::WidenMax);
1644
  idx = _gvn.transform( new (C) ConvI2LNode(idx, lidxtype) );
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#endif
1646
  Node* scale = _gvn.transform( new (C) LShiftXNode(idx, intcon(shift)) );
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  return basic_plus_adr(ary, base, scale);
}

//-------------------------load_array_element-------------------------
Node* GraphKit::load_array_element(Node* ctl, Node* ary, Node* idx, const TypeAryPtr* arytype) {
  const Type* elemtype = arytype->elem();
  BasicType elembt = elemtype->array_element_basic_type();
  Node* adr = array_element_address(ary, idx, elembt, arytype->size());
  Node* ld = make_load(ctl, adr, elemtype, elembt, arytype);
  return ld;
}

//-------------------------set_arguments_for_java_call-------------------------
// Arguments (pre-popped from the stack) are taken from the JVMS.
void GraphKit::set_arguments_for_java_call(CallJavaNode* call) {
  // Add the call arguments:
  uint nargs = call->method()->arg_size();
  for (uint i = 0; i < nargs; i++) {
    Node* arg = argument(i);
    call->init_req(i + TypeFunc::Parms, arg);
  }
}

//---------------------------set_edges_for_java_call---------------------------
// Connect a newly created call into the current JVMS.
// A return value node (if any) is returned from set_edges_for_java_call.
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void GraphKit::set_edges_for_java_call(CallJavaNode* call, bool must_throw, bool separate_io_proj) {
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  // Add the predefined inputs:
  call->init_req( TypeFunc::Control, control() );
  call->init_req( TypeFunc::I_O    , i_o() );
  call->init_req( TypeFunc::Memory , reset_memory() );
  call->init_req( TypeFunc::FramePtr, frameptr() );
  call->init_req( TypeFunc::ReturnAdr, top() );

  add_safepoint_edges(call, must_throw);

  Node* xcall = _gvn.transform(call);

  if (xcall == top()) {
    set_control(top());
    return;
  }
  assert(xcall == call, "call identity is stable");

  // Re-use the current map to produce the result.

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  set_control(_gvn.transform(new (C) ProjNode(call, TypeFunc::Control)));
  set_i_o(    _gvn.transform(new (C) ProjNode(call, TypeFunc::I_O    , separate_io_proj)));
1696
  set_all_memory_call(xcall, separate_io_proj);
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  //return xcall;   // no need, caller already has it
}

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Node* GraphKit::set_results_for_java_call(CallJavaNode* call, bool separate_io_proj) {
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  if (stopped())  return top();  // maybe the call folded up?

  // Capture the return value, if any.
  Node* ret;
  if (call->method() == NULL ||
      call->method()->return_type()->basic_type() == T_VOID)
        ret = top();
1709
  else  ret = _gvn.transform(new (C) ProjNode(call, TypeFunc::Parms));
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  // Note:  Since any out-of-line call can produce an exception,
  // we always insert an I_O projection from the call into the result.

1714
  make_slow_call_ex(call, env()->Throwable_klass(), separate_io_proj);
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  if (separate_io_proj) {
    // The caller requested separate projections be used by the fall
    // through and exceptional paths, so replace the projections for
    // the fall through path.
1720 1721
    set_i_o(_gvn.transform( new (C) ProjNode(call, TypeFunc::I_O) ));
    set_all_memory(_gvn.transform( new (C) ProjNode(call, TypeFunc::Memory) ));
1722
  }
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  return ret;
}

//--------------------set_predefined_input_for_runtime_call--------------------
// Reading and setting the memory state is way conservative here.
// The real problem is that I am not doing real Type analysis on memory,
// so I cannot distinguish card mark stores from other stores.  Across a GC
// point the Store Barrier and the card mark memory has to agree.  I cannot
// have a card mark store and its barrier split across the GC point from
// either above or below.  Here I get that to happen by reading ALL of memory.
// A better answer would be to separate out card marks from other memory.
// For now, return the input memory state, so that it can be reused
// after the call, if this call has restricted memory effects.
Node* GraphKit::set_predefined_input_for_runtime_call(SafePointNode* call) {
  // Set fixed predefined input arguments
  Node* memory = reset_memory();
  call->init_req( TypeFunc::Control,   control()  );
  call->init_req( TypeFunc::I_O,       top()      ); // does no i/o
  call->init_req( TypeFunc::Memory,    memory     ); // may gc ptrs
  call->init_req( TypeFunc::FramePtr,  frameptr() );
  call->init_req( TypeFunc::ReturnAdr, top()      );
  return memory;
}

//-------------------set_predefined_output_for_runtime_call--------------------
// Set control and memory (not i_o) from the call.
// If keep_mem is not NULL, use it for the output state,
// except for the RawPtr output of the call, if hook_mem is TypeRawPtr::BOTTOM.
// If hook_mem is NULL, this call produces no memory effects at all.
// If hook_mem is a Java-visible memory slice (such as arraycopy operands),
// then only that memory slice is taken from the call.
// In the last case, we must put an appropriate memory barrier before
// the call, so as to create the correct anti-dependencies on loads
// preceding the call.
void GraphKit::set_predefined_output_for_runtime_call(Node* call,
                                                      Node* keep_mem,
                                                      const TypePtr* hook_mem) {
  // no i/o
1761
  set_control(_gvn.transform( new (C) ProjNode(call,TypeFunc::Control) ));
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  if (keep_mem) {
    // First clone the existing memory state
    set_all_memory(keep_mem);
    if (hook_mem != NULL) {
      // Make memory for the call
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      Node* mem = _gvn.transform( new (C) ProjNode(call, TypeFunc::Memory) );
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      // Set the RawPtr memory state only.  This covers all the heap top/GC stuff
      // We also use hook_mem to extract specific effects from arraycopy stubs.
      set_memory(mem, hook_mem);
    }
    // ...else the call has NO memory effects.

    // Make sure the call advertises its memory effects precisely.
    // This lets us build accurate anti-dependences in gcm.cpp.
    assert(C->alias_type(call->adr_type()) == C->alias_type(hook_mem),
           "call node must be constructed correctly");
  } else {
    assert(hook_mem == NULL, "");
    // This is not a "slow path" call; all memory comes from the call.
    set_all_memory_call(call);
  }
}

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// Replace the call with the current state of the kit.
void GraphKit::replace_call(CallNode* call, Node* result) {
  JVMState* ejvms = NULL;
  if (has_exceptions()) {
    ejvms = transfer_exceptions_into_jvms();
  }

  SafePointNode* final_state = stop();

  // Find all the needed outputs of this call
  CallProjections callprojs;
  call->extract_projections(&callprojs, true);

1799
  Node* init_mem = call->in(TypeFunc::Memory);
1800
  Node* final_mem = final_state->in(TypeFunc::Memory);
1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813
  Node* final_ctl = final_state->in(TypeFunc::Control);
  Node* final_io = final_state->in(TypeFunc::I_O);

  // Replace all the old call edges with the edges from the inlining result
  if (callprojs.fallthrough_catchproj != NULL) {
    C->gvn_replace_by(callprojs.fallthrough_catchproj, final_ctl);
  }
  if (callprojs.fallthrough_memproj != NULL) {
    C->gvn_replace_by(callprojs.fallthrough_memproj,   final_mem);
  }
  if (callprojs.fallthrough_ioproj != NULL) {
    C->gvn_replace_by(callprojs.fallthrough_ioproj,    final_io);
  }
1814 1815 1816 1817 1818 1819 1820 1821

  // Replace the result with the new result if it exists and is used
  if (callprojs.resproj != NULL && result != NULL) {
    C->gvn_replace_by(callprojs.resproj, result);
  }

  if (ejvms == NULL) {
    // No exception edges to simply kill off those paths
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    if (callprojs.catchall_catchproj != NULL) {
      C->gvn_replace_by(callprojs.catchall_catchproj, C->top());
    }
    if (callprojs.catchall_memproj != NULL) {
      C->gvn_replace_by(callprojs.catchall_memproj,   C->top());
    }
    if (callprojs.catchall_ioproj != NULL) {
      C->gvn_replace_by(callprojs.catchall_ioproj,    C->top());
    }
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    // Replace the old exception object with top
    if (callprojs.exobj != NULL) {
      C->gvn_replace_by(callprojs.exobj, C->top());
    }
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  } else {
    GraphKit ekit(ejvms);

    // Load my combined exception state into the kit, with all phis transformed:
    SafePointNode* ex_map = ekit.combine_and_pop_all_exception_states();

    Node* ex_oop = ekit.use_exception_state(ex_map);
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    if (callprojs.catchall_catchproj != NULL) {
      C->gvn_replace_by(callprojs.catchall_catchproj, ekit.control());
    }
    if (callprojs.catchall_memproj != NULL) {
      C->gvn_replace_by(callprojs.catchall_memproj,   ekit.reset_memory());
    }
    if (callprojs.catchall_ioproj != NULL) {
      C->gvn_replace_by(callprojs.catchall_ioproj,    ekit.i_o());
    }
1851 1852 1853 1854 1855 1856 1857 1858

    // Replace the old exception object with the newly created one
    if (callprojs.exobj != NULL) {
      C->gvn_replace_by(callprojs.exobj, ex_oop);
    }
  }

  // Disconnect the call from the graph
1859
  call->disconnect_inputs(NULL, C);
1860
  C->gvn_replace_by(call, C->top());
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  // Clean up any MergeMems that feed other MergeMems since the
  // optimizer doesn't like that.
  if (final_mem->is_MergeMem()) {
    Node_List wl;
    for (SimpleDUIterator i(final_mem); i.has_next(); i.next()) {
      Node* m = i.get();
      if (m->is_MergeMem() && !wl.contains(m)) {
        wl.push(m);
      }
    }
    while (wl.size()  > 0) {
      _gvn.transform(wl.pop());
    }
  }
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}


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//------------------------------increment_counter------------------------------
// for statistics: increment a VM counter by 1

void GraphKit::increment_counter(address counter_addr) {
  Node* adr1 = makecon(TypeRawPtr::make(counter_addr));
  increment_counter(adr1);
}

void GraphKit::increment_counter(Node* counter_addr) {
  int adr_type = Compile::AliasIdxRaw;
1889 1890
  Node* ctrl = control();
  Node* cnt  = make_load(ctrl, counter_addr, TypeInt::INT, T_INT, adr_type);
1891
  Node* incr = _gvn.transform(new (C) AddINode(cnt, _gvn.intcon(1)));
1892
  store_to_memory( ctrl, counter_addr, incr, T_INT, adr_type );
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}


//------------------------------uncommon_trap----------------------------------
// Bail out to the interpreter in mid-method.  Implemented by calling the
// uncommon_trap blob.  This helper function inserts a runtime call with the
// right debug info.
void GraphKit::uncommon_trap(int trap_request,
                             ciKlass* klass, const char* comment,
                             bool must_throw,
                             bool keep_exact_action) {
  if (failing())  stop();
  if (stopped())  return; // trap reachable?

  // Note:  If ProfileTraps is true, and if a deopt. actually
  // occurs here, the runtime will make sure an MDO exists.  There is
1909
  // no need to call method()->ensure_method_data() at this point.
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  // Set the stack pointer to the right value for reexecution:
  set_sp(reexecute_sp());

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#ifdef ASSERT
  if (!must_throw) {
    // Make sure the stack has at least enough depth to execute
    // the current bytecode.
1918 1919 1920 1921
    int inputs, ignored_depth;
    if (compute_stack_effects(inputs, ignored_depth)) {
      assert(sp() >= inputs, err_msg_res("must have enough JVMS stack to execute %s: sp=%d, inputs=%d",
             Bytecodes::name(java_bc()), sp(), inputs));
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    }
  }
#endif

  Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(trap_request);
  Deoptimization::DeoptAction action = Deoptimization::trap_request_action(trap_request);

  switch (action) {
  case Deoptimization::Action_maybe_recompile:
  case Deoptimization::Action_reinterpret:
    // Temporary fix for 6529811 to allow virtual calls to be sure they
    // get the chance to go from mono->bi->mega
    if (!keep_exact_action &&
        Deoptimization::trap_request_index(trap_request) < 0 &&
        too_many_recompiles(reason)) {
      // This BCI is causing too many recompilations.
      action = Deoptimization::Action_none;
      trap_request = Deoptimization::make_trap_request(reason, action);
    } else {
      C->set_trap_can_recompile(true);
    }
    break;
  case Deoptimization::Action_make_not_entrant:
    C->set_trap_can_recompile(true);
    break;
#ifdef ASSERT
  case Deoptimization::Action_none:
  case Deoptimization::Action_make_not_compilable:
    break;
  default:
1952 1953
    fatal(err_msg_res("unknown action %d: %s", action, Deoptimization::trap_action_name(action)));
    break;
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#endif
  }

  if (TraceOptoParse) {
    char buf[100];
    tty->print_cr("Uncommon trap %s at bci:%d",
                  Deoptimization::format_trap_request(buf, sizeof(buf),
                                                      trap_request), bci());
  }

  CompileLog* log = C->log();
  if (log != NULL) {
    int kid = (klass == NULL)? -1: log->identify(klass);
    log->begin_elem("uncommon_trap bci='%d'", bci());
    char buf[100];
    log->print(" %s", Deoptimization::format_trap_request(buf, sizeof(buf),
                                                          trap_request));
    if (kid >= 0)         log->print(" klass='%d'", kid);
    if (comment != NULL)  log->print(" comment='%s'", comment);
    log->end_elem();
  }

  // Make sure any guarding test views this path as very unlikely
  Node *i0 = control()->in(0);
  if (i0 != NULL && i0->is_If()) {        // Found a guarding if test?
    IfNode *iff = i0->as_If();
    float f = iff->_prob;   // Get prob
    if (control()->Opcode() == Op_IfTrue) {
      if (f > PROB_UNLIKELY_MAG(4))
        iff->_prob = PROB_MIN;
    } else {
      if (f < PROB_LIKELY_MAG(4))
        iff->_prob = PROB_MAX;
    }
  }

  // Clear out dead values from the debug info.
  kill_dead_locals();

  // Now insert the uncommon trap subroutine call
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  address call_addr = SharedRuntime::uncommon_trap_blob()->entry_point();
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  const TypePtr* no_memory_effects = NULL;
  // Pass the index of the class to be loaded
  Node* call = make_runtime_call(RC_NO_LEAF | RC_UNCOMMON |
                                 (must_throw ? RC_MUST_THROW : 0),
                                 OptoRuntime::uncommon_trap_Type(),
                                 call_addr, "uncommon_trap", no_memory_effects,
                                 intcon(trap_request));
  assert(call->as_CallStaticJava()->uncommon_trap_request() == trap_request,
         "must extract request correctly from the graph");
  assert(trap_request != 0, "zero value reserved by uncommon_trap_request");

  call->set_req(TypeFunc::ReturnAdr, returnadr());
  // The debug info is the only real input to this call.

  // Halt-and-catch fire here.  The above call should never return!
2010
  HaltNode* halt = new(C) HaltNode(control(), frameptr());
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  _gvn.set_type_bottom(halt);
  root()->add_req(halt);

  stop_and_kill_map();
}


//--------------------------just_allocated_object------------------------------
// Report the object that was just allocated.
// It must be the case that there are no intervening safepoints.
// We use this to determine if an object is so "fresh" that
// it does not require card marks.
Node* GraphKit::just_allocated_object(Node* current_control) {
  if (C->recent_alloc_ctl() == current_control)
    return C->recent_alloc_obj();
  return NULL;
}


void GraphKit::round_double_arguments(ciMethod* dest_method) {
  // (Note:  TypeFunc::make has a cache that makes this fast.)
  const TypeFunc* tf    = TypeFunc::make(dest_method);
  int             nargs = tf->_domain->_cnt - TypeFunc::Parms;
  for (int j = 0; j < nargs; j++) {
    const Type *targ = tf->_domain->field_at(j + TypeFunc::Parms);
    if( targ->basic_type() == T_DOUBLE ) {
      // If any parameters are doubles, they must be rounded before
      // the call, dstore_rounding does gvn.transform
      Node *arg = argument(j);
      arg = dstore_rounding(arg);
      set_argument(j, arg);
    }
  }
}

void GraphKit::round_double_result(ciMethod* dest_method) {
  // A non-strict method may return a double value which has an extended
  // exponent, but this must not be visible in a caller which is 'strict'
  // If a strict caller invokes a non-strict callee, round a double result

  BasicType result_type = dest_method->return_type()->basic_type();
  assert( method() != NULL, "must have caller context");
  if( result_type == T_DOUBLE && method()->is_strict() && !dest_method->is_strict() ) {
    // Destination method's return value is on top of stack
    // dstore_rounding() does gvn.transform
    Node *result = pop_pair();
    result = dstore_rounding(result);
    push_pair(result);
  }
}

// rounding for strict float precision conformance
Node* GraphKit::precision_rounding(Node* n) {
  return UseStrictFP && _method->flags().is_strict()
    && UseSSE == 0 && Matcher::strict_fp_requires_explicit_rounding
2066
    ? _gvn.transform( new (C) RoundFloatNode(0, n) )
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    : n;
}

// rounding for strict double precision conformance
Node* GraphKit::dprecision_rounding(Node *n) {
  return UseStrictFP && _method->flags().is_strict()
    && UseSSE <= 1 && Matcher::strict_fp_requires_explicit_rounding
2074
    ? _gvn.transform( new (C) RoundDoubleNode(0, n) )
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    : n;
}

// rounding for non-strict double stores
Node* GraphKit::dstore_rounding(Node* n) {
  return Matcher::strict_fp_requires_explicit_rounding
    && UseSSE <= 1
2082
    ? _gvn.transform( new (C) RoundDoubleNode(0, n) )
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    : n;
}

//=============================================================================
// Generate a fast path/slow path idiom.  Graph looks like:
// [foo] indicates that 'foo' is a parameter
//
//              [in]     NULL
//                 \    /
//                  CmpP
//                  Bool ne
//                   If
//                  /  \
//              True    False-<2>
//              / |
//             /  cast_not_null
//           Load  |    |   ^
//        [fast_test]   |   |
// gvn to   opt_test    |   |
//          /    \      |  <1>
//      True     False  |
//        |         \\  |
//   [slow_call]     \[fast_result]
//    Ctl   Val       \      \
//     |               \      \
//    Catch       <1>   \      \
//   /    \        ^     \      \
//  Ex    No_Ex    |      \      \
//  |       \   \  |       \ <2>  \
//  ...      \  [slow_res] |  |    \   [null_result]
//            \         \--+--+---  |  |
//             \           | /    \ | /
//              --------Region     Phi
//
//=============================================================================
// Code is structured as a series of driver functions all called 'do_XXX' that
// call a set of helper functions.  Helper functions first, then drivers.

//------------------------------null_check_oop---------------------------------
// Null check oop.  Set null-path control into Region in slot 3.
// Make a cast-not-nullness use the other not-null control.  Return cast.
Node* GraphKit::null_check_oop(Node* value, Node* *null_control,
2125
                               bool never_see_null, bool safe_for_replace) {
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  // Initial NULL check taken path
  (*null_control) = top();
  Node* cast = null_check_common(value, T_OBJECT, false, null_control);

  // Generate uncommon_trap:
  if (never_see_null && (*null_control) != top()) {
    // If we see an unexpected null at a check-cast we record it and force a
    // recompile; the offending check-cast will be compiled to handle NULLs.
    // If we see more than one offending BCI, then all checkcasts in the
    // method will be compiled to handle NULLs.
    PreserveJVMState pjvms(this);
    set_control(*null_control);
2138
    replace_in_map(value, null());
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    uncommon_trap(Deoptimization::Reason_null_check,
                  Deoptimization::Action_make_not_entrant);
    (*null_control) = top();    // NULL path is dead
  }
2143 2144 2145
  if ((*null_control) == top() && safe_for_replace) {
    replace_in_map(value, cast);
  }
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  // Cast away null-ness on the result
  return cast;
}

//------------------------------opt_iff----------------------------------------
// Optimize the fast-check IfNode.  Set the fast-path region slot 2.
// Return slow-path control.
Node* GraphKit::opt_iff(Node* region, Node* iff) {
  IfNode *opt_iff = _gvn.transform(iff)->as_If();

  // Fast path taken; set region slot 2
2158
  Node *fast_taken = _gvn.transform( new (C) IfFalseNode(opt_iff) );
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  region->init_req(2,fast_taken); // Capture fast-control

  // Fast path not-taken, i.e. slow path
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  Node *slow_taken = _gvn.transform( new (C) IfTrueNode(opt_iff) );
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  return slow_taken;
}

//-----------------------------make_runtime_call-------------------------------
Node* GraphKit::make_runtime_call(int flags,
                                  const TypeFunc* call_type, address call_addr,
                                  const char* call_name,
                                  const TypePtr* adr_type,
                                  // The following parms are all optional.
                                  // The first NULL ends the list.
                                  Node* parm0, Node* parm1,
                                  Node* parm2, Node* parm3,
                                  Node* parm4, Node* parm5,
                                  Node* parm6, Node* parm7) {
  // Slow-path call
  bool is_leaf = !(flags & RC_NO_LEAF);
  bool has_io  = (!is_leaf && !(flags & RC_NO_IO));
  if (call_name == NULL) {
    assert(!is_leaf, "must supply name for leaf");
    call_name = OptoRuntime::stub_name(call_addr);
  }
  CallNode* call;
  if (!is_leaf) {
2186
    call = new(C) CallStaticJavaNode(call_type, call_addr, call_name,
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                                           bci(), adr_type);
  } else if (flags & RC_NO_FP) {
2189
    call = new(C) CallLeafNoFPNode(call_type, call_addr, call_name, adr_type);
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  } else {
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    call = new(C) CallLeafNode(call_type, call_addr, call_name, adr_type);
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  }

  // The following is similar to set_edges_for_java_call,
  // except that the memory effects of the call are restricted to AliasIdxRaw.

  // Slow path call has no side-effects, uses few values
  bool wide_in  = !(flags & RC_NARROW_MEM);
  bool wide_out = (C->get_alias_index(adr_type) == Compile::AliasIdxBot);

  Node* prev_mem = NULL;
  if (wide_in) {
    prev_mem = set_predefined_input_for_runtime_call(call);
  } else {
    assert(!wide_out, "narrow in => narrow out");
    Node* narrow_mem = memory(adr_type);
    prev_mem = reset_memory();
    map()->set_memory(narrow_mem);
    set_predefined_input_for_runtime_call(call);
  }

  // Hook each parm in order.  Stop looking at the first NULL.
  if (parm0 != NULL) { call->init_req(TypeFunc::Parms+0, parm0);
  if (parm1 != NULL) { call->init_req(TypeFunc::Parms+1, parm1);
  if (parm2 != NULL) { call->init_req(TypeFunc::Parms+2, parm2);
  if (parm3 != NULL) { call->init_req(TypeFunc::Parms+3, parm3);
  if (parm4 != NULL) { call->init_req(TypeFunc::Parms+4, parm4);
  if (parm5 != NULL) { call->init_req(TypeFunc::Parms+5, parm5);
  if (parm6 != NULL) { call->init_req(TypeFunc::Parms+6, parm6);
  if (parm7 != NULL) { call->init_req(TypeFunc::Parms+7, parm7);
    /* close each nested if ===> */  } } } } } } } }
  assert(call->in(call->req()-1) != NULL, "must initialize all parms");

  if (!is_leaf) {
    // Non-leaves can block and take safepoints:
    add_safepoint_edges(call, ((flags & RC_MUST_THROW) != 0));
  }
  // Non-leaves can throw exceptions:
  if (has_io) {
    call->set_req(TypeFunc::I_O, i_o());
  }

  if (flags & RC_UNCOMMON) {
    // Set the count to a tiny probability.  Cf. Estimate_Block_Frequency.
    // (An "if" probability corresponds roughly to an unconditional count.
    // Sort of.)
    call->set_cnt(PROB_UNLIKELY_MAG(4));
  }

  Node* c = _gvn.transform(call);
  assert(c == call, "cannot disappear");

  if (wide_out) {
    // Slow path call has full side-effects.
    set_predefined_output_for_runtime_call(call);
  } else {
    // Slow path call has few side-effects, and/or sets few values.
    set_predefined_output_for_runtime_call(call, prev_mem, adr_type);
  }

  if (has_io) {
2252
    set_i_o(_gvn.transform(new (C) ProjNode(call, TypeFunc::I_O)));
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  }
  return call;

}

//------------------------------merge_memory-----------------------------------
// Merge memory from one path into the current memory state.
void GraphKit::merge_memory(Node* new_mem, Node* region, int new_path) {
  for (MergeMemStream mms(merged_memory(), new_mem->as_MergeMem()); mms.next_non_empty2(); ) {
    Node* old_slice = mms.force_memory();
    Node* new_slice = mms.memory2();
    if (old_slice != new_slice) {
      PhiNode* phi;
      if (new_slice->is_Phi() && new_slice->as_Phi()->region() == region) {
        phi = new_slice->as_Phi();
        #ifdef ASSERT
        if (old_slice->is_Phi() && old_slice->as_Phi()->region() == region)
          old_slice = old_slice->in(new_path);
        // Caller is responsible for ensuring that any pre-existing
        // phis are already aware of old memory.
        int old_path = (new_path > 1) ? 1 : 2;  // choose old_path != new_path
        assert(phi->in(old_path) == old_slice, "pre-existing phis OK");
        #endif
        mms.set_memory(phi);
      } else {
        phi = PhiNode::make(region, old_slice, Type::MEMORY, mms.adr_type(C));
        _gvn.set_type(phi, Type::MEMORY);
        phi->set_req(new_path, new_slice);
        mms.set_memory(_gvn.transform(phi));  // assume it is complete
      }
    }
  }
}

//------------------------------make_slow_call_ex------------------------------
// Make the exception handler hookups for the slow call
void GraphKit::make_slow_call_ex(Node* call, ciInstanceKlass* ex_klass, bool separate_io_proj) {
  if (stopped())  return;

  // Make a catch node with just two handlers:  fall-through and catch-all
2293 2294 2295 2296
  Node* i_o  = _gvn.transform( new (C) ProjNode(call, TypeFunc::I_O, separate_io_proj) );
  Node* catc = _gvn.transform( new (C) CatchNode(control(), i_o, 2) );
  Node* norm = _gvn.transform( new (C) CatchProjNode(catc, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci) );
  Node* excp = _gvn.transform( new (C) CatchProjNode(catc, CatchProjNode::catch_all_index,    CatchProjNode::no_handler_bci) );
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  { PreserveJVMState pjvms(this);
    set_control(excp);
    set_i_o(i_o);

    if (excp != top()) {
      // Create an exception state also.
      // Use an exact type if the caller has specified a specific exception.
      const Type* ex_type = TypeOopPtr::make_from_klass_unique(ex_klass)->cast_to_ptr_type(TypePtr::NotNull);
2306
      Node*       ex_oop  = new (C) CreateExNode(ex_type, control(), i_o);
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      add_exception_state(make_exception_state(_gvn.transform(ex_oop)));
    }
  }

  // Get the no-exception control from the CatchNode.
  set_control(norm);
}


//-------------------------------gen_subtype_check-----------------------------
// Generate a subtyping check.  Takes as input the subtype and supertype.
// Returns 2 values: sets the default control() to the true path and returns
// the false path.  Only reads invariant memory; sets no (visible) memory.
// The PartialSubtypeCheckNode sets the hidden 1-word cache in the encoding
// but that's not exposed to the optimizer.  This call also doesn't take in an
// Object; if you wish to check an Object you need to load the Object's class
// prior to coming here.
Node* GraphKit::gen_subtype_check(Node* subklass, Node* superklass) {
  // Fast check for identical types, perhaps identical constants.
  // The types can even be identical non-constants, in cases
  // involving Array.newInstance, Object.clone, etc.
  if (subklass == superklass)
    return top();             // false path is dead; no test needed.

  if (_gvn.type(superklass)->singleton()) {
    ciKlass* superk = _gvn.type(superklass)->is_klassptr()->klass();
    ciKlass* subk   = _gvn.type(subklass)->is_klassptr()->klass();

    // In the common case of an exact superklass, try to fold up the
    // test before generating code.  You may ask, why not just generate
    // the code and then let it fold up?  The answer is that the generated
    // code will necessarily include null checks, which do not always
    // completely fold away.  If they are also needless, then they turn
    // into a performance loss.  Example:
    //    Foo[] fa = blah(); Foo x = fa[0]; fa[1] = x;
    // Here, the type of 'fa' is often exact, so the store check
    // of fa[1]=x will fold up, without testing the nullness of x.
    switch (static_subtype_check(superk, subk)) {
    case SSC_always_false:
      {
        Node* always_fail = control();
        set_control(top());
        return always_fail;
      }
    case SSC_always_true:
      return top();
    case SSC_easy_test:
      {
        // Just do a direct pointer compare and be done.
2356 2357
        Node* cmp = _gvn.transform( new(C) CmpPNode(subklass, superklass) );
        Node* bol = _gvn.transform( new(C) BoolNode(cmp, BoolTest::eq) );
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        IfNode* iff = create_and_xform_if(control(), bol, PROB_STATIC_FREQUENT, COUNT_UNKNOWN);
2359 2360
        set_control( _gvn.transform( new(C) IfTrueNode (iff) ) );
        return       _gvn.transform( new(C) IfFalseNode(iff) );
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      }
    case SSC_full_test:
      break;
    default:
      ShouldNotReachHere();
    }
  }

  // %%% Possible further optimization:  Even if the superklass is not exact,
  // if the subklass is the unique subtype of the superklass, the check
  // will always succeed.  We could leave a dependency behind to ensure this.

  // First load the super-klass's check-offset
2374
  Node *p1 = basic_plus_adr( superklass, superklass, in_bytes(Klass::super_check_offset_offset()) );
2375
  Node *chk_off = _gvn.transform( new (C) LoadINode( NULL, memory(p1), p1, _gvn.type(p1)->is_ptr() ) );
2376
  int cacheoff_con = in_bytes(Klass::secondary_super_cache_offset());
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  bool might_be_cache = (find_int_con(chk_off, cacheoff_con) == cacheoff_con);

  // Load from the sub-klass's super-class display list, or a 1-word cache of
  // the secondary superclass list, or a failing value with a sentinel offset
  // if the super-klass is an interface or exceptionally deep in the Java
  // hierarchy and we have to scan the secondary superclass list the hard way.
  // Worst-case type is a little odd: NULL is allowed as a result (usually
  // klass loads can never produce a NULL).
  Node *chk_off_X = ConvI2X(chk_off);
2386
  Node *p2 = _gvn.transform( new (C) AddPNode(subklass,subklass,chk_off_X) );
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  // For some types like interfaces the following loadKlass is from a 1-word
  // cache which is mutable so can't use immutable memory.  Other
  // types load from the super-class display table which is immutable.
  Node *kmem = might_be_cache ? memory(p2) : immutable_memory();
2391
  Node *nkls = _gvn.transform( LoadKlassNode::make( _gvn, kmem, p2, _gvn.type(p2)->is_ptr(), TypeKlassPtr::OBJECT_OR_NULL ) );
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  // Compile speed common case: ARE a subtype and we canNOT fail
  if( superklass == nkls )
    return top();             // false path is dead; no test needed.

  // See if we get an immediate positive hit.  Happens roughly 83% of the
  // time.  Test to see if the value loaded just previously from the subklass
  // is exactly the superklass.
2400 2401
  Node *cmp1 = _gvn.transform( new (C) CmpPNode( superklass, nkls ) );
  Node *bol1 = _gvn.transform( new (C) BoolNode( cmp1, BoolTest::eq ) );
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  IfNode *iff1 = create_and_xform_if( control(), bol1, PROB_LIKELY(0.83f), COUNT_UNKNOWN );
2403 2404
  Node *iftrue1 = _gvn.transform( new (C) IfTrueNode ( iff1 ) );
  set_control(    _gvn.transform( new (C) IfFalseNode( iff1 ) ) );
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  // Compile speed common case: Check for being deterministic right now.  If
  // chk_off is a constant and not equal to cacheoff then we are NOT a
  // subklass.  In this case we need exactly the 1 test above and we can
  // return those results immediately.
  if (!might_be_cache) {
    Node* not_subtype_ctrl = control();
    set_control(iftrue1); // We need exactly the 1 test above
    return not_subtype_ctrl;
  }

  // Gather the various success & failures here
2417
  RegionNode *r_ok_subtype = new (C) RegionNode(4);
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  record_for_igvn(r_ok_subtype);
2419
  RegionNode *r_not_subtype = new (C) RegionNode(3);
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  record_for_igvn(r_not_subtype);

  r_ok_subtype->init_req(1, iftrue1);

  // Check for immediate negative hit.  Happens roughly 11% of the time (which
  // is roughly 63% of the remaining cases).  Test to see if the loaded
  // check-offset points into the subklass display list or the 1-element
  // cache.  If it points to the display (and NOT the cache) and the display
  // missed then it's not a subtype.
  Node *cacheoff = _gvn.intcon(cacheoff_con);
2430 2431
  Node *cmp2 = _gvn.transform( new (C) CmpINode( chk_off, cacheoff ) );
  Node *bol2 = _gvn.transform( new (C) BoolNode( cmp2, BoolTest::ne ) );
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  IfNode *iff2 = create_and_xform_if( control(), bol2, PROB_LIKELY(0.63f), COUNT_UNKNOWN );
2433 2434
  r_not_subtype->init_req(1, _gvn.transform( new (C) IfTrueNode (iff2) ) );
  set_control(                _gvn.transform( new (C) IfFalseNode(iff2) ) );
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2436
  // Check for self.  Very rare to get here, but it is taken 1/3 the time.
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  // No performance impact (too rare) but allows sharing of secondary arrays
  // which has some footprint reduction.
2439 2440
  Node *cmp3 = _gvn.transform( new (C) CmpPNode( subklass, superklass ) );
  Node *bol3 = _gvn.transform( new (C) BoolNode( cmp3, BoolTest::eq ) );
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  IfNode *iff3 = create_and_xform_if( control(), bol3, PROB_LIKELY(0.36f), COUNT_UNKNOWN );
2442 2443
  r_ok_subtype->init_req(2, _gvn.transform( new (C) IfTrueNode ( iff3 ) ) );
  set_control(               _gvn.transform( new (C) IfFalseNode( iff3 ) ) );
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2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459
  // -- Roads not taken here: --
  // We could also have chosen to perform the self-check at the beginning
  // of this code sequence, as the assembler does.  This would not pay off
  // the same way, since the optimizer, unlike the assembler, can perform
  // static type analysis to fold away many successful self-checks.
  // Non-foldable self checks work better here in second position, because
  // the initial primary superclass check subsumes a self-check for most
  // types.  An exception would be a secondary type like array-of-interface,
  // which does not appear in its own primary supertype display.
  // Finally, we could have chosen to move the self-check into the
  // PartialSubtypeCheckNode, and from there out-of-line in a platform
  // dependent manner.  But it is worthwhile to have the check here,
  // where it can be perhaps be optimized.  The cost in code space is
  // small (register compare, branch).

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  // Now do a linear scan of the secondary super-klass array.  Again, no real
  // performance impact (too rare) but it's gotta be done.
  // Since the code is rarely used, there is no penalty for moving it
2463 2464 2465
  // out of line, and it can only improve I-cache density.
  // The decision to inline or out-of-line this final check is platform
  // dependent, and is found in the AD file definition of PartialSubtypeCheck.
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  Node* psc = _gvn.transform(
2467
    new (C) PartialSubtypeCheckNode(control(), subklass, superklass) );
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  Node *cmp4 = _gvn.transform( new (C) CmpPNode( psc, null() ) );
  Node *bol4 = _gvn.transform( new (C) BoolNode( cmp4, BoolTest::ne ) );
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  IfNode *iff4 = create_and_xform_if( control(), bol4, PROB_FAIR, COUNT_UNKNOWN );
2472 2473
  r_not_subtype->init_req(2, _gvn.transform( new (C) IfTrueNode (iff4) ) );
  r_ok_subtype ->init_req(3, _gvn.transform( new (C) IfFalseNode(iff4) ) );
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  // Return false path; set default control to true path.
  set_control( _gvn.transform(r_ok_subtype) );
  return _gvn.transform(r_not_subtype);
}

//----------------------------static_subtype_check-----------------------------
// Shortcut important common cases when superklass is exact:
// (0) superklass is java.lang.Object (can occur in reflective code)
// (1) subklass is already limited to a subtype of superklass => always ok
// (2) subklass does not overlap with superklass => always fail
// (3) superklass has NO subtypes and we can check with a simple compare.
int GraphKit::static_subtype_check(ciKlass* superk, ciKlass* subk) {
  if (StressReflectiveCode) {
    return SSC_full_test;       // Let caller generate the general case.
  }

  if (superk == env()->Object_klass()) {
    return SSC_always_true;     // (0) this test cannot fail
  }

  ciType* superelem = superk;
  if (superelem->is_array_klass())
    superelem = superelem->as_array_klass()->base_element_type();

  if (!subk->is_interface()) {  // cannot trust static interface types yet
    if (subk->is_subtype_of(superk)) {
      return SSC_always_true;   // (1) false path dead; no dynamic test needed
    }
    if (!(superelem->is_klass() && superelem->as_klass()->is_interface()) &&
        !superk->is_subtype_of(subk)) {
      return SSC_always_false;
    }
  }

  // If casting to an instance klass, it must have no subtypes
  if (superk->is_interface()) {
    // Cannot trust interfaces yet.
    // %%% S.B. superk->nof_implementors() == 1
  } else if (superelem->is_instance_klass()) {
    ciInstanceKlass* ik = superelem->as_instance_klass();
    if (!ik->has_subklass() && !ik->is_interface()) {
      if (!ik->is_final()) {
        // Add a dependency if there is a chance of a later subclass.
        C->dependencies()->assert_leaf_type(ik);
      }
      return SSC_easy_test;     // (3) caller can do a simple ptr comparison
    }
  } else {
    // A primitive array type has no subtypes.
    return SSC_easy_test;       // (3) caller can do a simple ptr comparison
  }

  return SSC_full_test;
}

// Profile-driven exact type check:
Node* GraphKit::type_check_receiver(Node* receiver, ciKlass* klass,
                                    float prob,
                                    Node* *casted_receiver) {
  const TypeKlassPtr* tklass = TypeKlassPtr::make(klass);
  Node* recv_klass = load_object_klass(receiver);
  Node* want_klass = makecon(tklass);
2537 2538
  Node* cmp = _gvn.transform( new(C) CmpPNode(recv_klass, want_klass) );
  Node* bol = _gvn.transform( new(C) BoolNode(cmp, BoolTest::eq) );
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  IfNode* iff = create_and_xform_if(control(), bol, prob, COUNT_UNKNOWN);
2540 2541
  set_control( _gvn.transform( new(C) IfTrueNode (iff) ));
  Node* fail = _gvn.transform( new(C) IfFalseNode(iff) );
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  const TypeOopPtr* recv_xtype = tklass->as_instance_type();
  assert(recv_xtype->klass_is_exact(), "");

  // Subsume downstream occurrences of receiver with a cast to
  // recv_xtype, since now we know what the type will be.
2548
  Node* cast = new(C) CheckCastPPNode(control(), receiver, recv_xtype);
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  (*casted_receiver) = _gvn.transform(cast);
  // (User must make the replace_in_map call.)

  return fail;
}


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//------------------------------seems_never_null-------------------------------
// Use null_seen information if it is available from the profile.
// If we see an unexpected null at a type check we record it and force a
// recompile; the offending check will be recompiled to handle NULLs.
// If we see several offending BCIs, then all checks in the
// method will be recompiled.
bool GraphKit::seems_never_null(Node* obj, ciProfileData* data) {
  if (UncommonNullCast               // Cutout for this technique
      && obj != null()               // And not the -Xcomp stupid case?
      && !too_many_traps(Deoptimization::Reason_null_check)
      ) {
    if (data == NULL)
      // Edge case:  no mature data.  Be optimistic here.
      return true;
    // If the profile has not seen a null, assume it won't happen.
    assert(java_bc() == Bytecodes::_checkcast ||
           java_bc() == Bytecodes::_instanceof ||
           java_bc() == Bytecodes::_aastore, "MDO must collect null_seen bit here");
    return !data->as_BitData()->null_seen();
  }
  return false;
}

//------------------------maybe_cast_profiled_receiver-------------------------
// If the profile has seen exactly one type, narrow to exactly that type.
// Subsequent type checks will always fold up.
Node* GraphKit::maybe_cast_profiled_receiver(Node* not_null_obj,
                                             ciProfileData* data,
                                             ciKlass* require_klass) {
  if (!UseTypeProfile || !TypeProfileCasts) return NULL;
  if (data == NULL)  return NULL;

  // Make sure we haven't already deoptimized from this tactic.
  if (too_many_traps(Deoptimization::Reason_class_check))
    return NULL;

  // (No, this isn't a call, but it's enough like a virtual call
  // to use the same ciMethod accessor to get the profile info...)
  ciCallProfile profile = method()->call_profile_at_bci(bci());
  if (profile.count() >= 0 &&         // no cast failures here
      profile.has_receiver(0) &&
      profile.morphism() == 1) {
    ciKlass* exact_kls = profile.receiver(0);
    if (require_klass == NULL ||
        static_subtype_check(require_klass, exact_kls) == SSC_always_true) {
      // If we narrow the type to match what the type profile sees,
      // we can then remove the rest of the cast.
      // This is a win, even if the exact_kls is very specific,
      // because downstream operations, such as method calls,
      // will often benefit from the sharper type.
      Node* exact_obj = not_null_obj; // will get updated in place...
      Node* slow_ctl  = type_check_receiver(exact_obj, exact_kls, 1.0,
                                            &exact_obj);
      { PreserveJVMState pjvms(this);
        set_control(slow_ctl);
        uncommon_trap(Deoptimization::Reason_class_check,
                      Deoptimization::Action_maybe_recompile);
      }
      replace_in_map(not_null_obj, exact_obj);
      return exact_obj;
    }
    // assert(ssc == SSC_always_true)... except maybe the profile lied to us.
  }

  return NULL;
}


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//-------------------------------gen_instanceof--------------------------------
// Generate an instance-of idiom.  Used by both the instance-of bytecode
// and the reflective instance-of call.
2627 2628
Node* GraphKit::gen_instanceof(Node* obj, Node* superklass) {
  kill_dead_locals();           // Benefit all the uncommon traps
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  assert( !stopped(), "dead parse path should be checked in callers" );
  assert(!TypePtr::NULL_PTR->higher_equal(_gvn.type(superklass)->is_klassptr()),
         "must check for not-null not-dead klass in callers");

  // Make the merge point
  enum { _obj_path = 1, _fail_path, _null_path, PATH_LIMIT };
2635 2636
  RegionNode* region = new(C) RegionNode(PATH_LIMIT);
  Node*       phi    = new(C) PhiNode(region, TypeInt::BOOL);
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  C->set_has_split_ifs(true); // Has chance for split-if optimization

2639
  ciProfileData* data = NULL;
2640
  bool safe_for_replace = false;
2641 2642
  if (java_bc() == Bytecodes::_instanceof) {  // Only for the bytecode
    data = method()->method_data()->bci_to_data(bci());
2643
    safe_for_replace = true;
2644 2645 2646 2647
  }
  bool never_see_null = (ProfileDynamicTypes  // aggressive use of profile
                         && seems_never_null(obj, data));

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  // Null check; get casted pointer; set region slot 3
  Node* null_ctl = top();
2650
  Node* not_null_obj = null_check_oop(obj, &null_ctl, never_see_null, safe_for_replace);
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  // If not_null_obj is dead, only null-path is taken
  if (stopped()) {              // Doing instance-of on a NULL?
    set_control(null_ctl);
    return intcon(0);
  }
  region->init_req(_null_path, null_ctl);
  phi   ->init_req(_null_path, intcon(0)); // Set null path value
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  if (null_ctl == top()) {
    // Do this eagerly, so that pattern matches like is_diamond_phi
    // will work even during parsing.
    assert(_null_path == PATH_LIMIT-1, "delete last");
    region->del_req(_null_path);
    phi   ->del_req(_null_path);
  }

  if (ProfileDynamicTypes && data != NULL) {
    Node* cast_obj = maybe_cast_profiled_receiver(not_null_obj, data, NULL);
    if (stopped()) {            // Profile disagrees with this path.
      set_control(null_ctl);    // Null is the only remaining possibility.
      return intcon(0);
    }
    if (cast_obj != NULL)
      not_null_obj = cast_obj;
  }
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  // Load the object's klass
  Node* obj_klass = load_object_klass(not_null_obj);

  // Generate the subtype check
  Node* not_subtype_ctrl = gen_subtype_check(obj_klass, superklass);

  // Plug in the success path to the general merge in slot 1.
  region->init_req(_obj_path, control());
  phi   ->init_req(_obj_path, intcon(1));

  // Plug in the failing path to the general merge in slot 2.
  region->init_req(_fail_path, not_subtype_ctrl);
  phi   ->init_req(_fail_path, intcon(0));

  // Return final merged results
  set_control( _gvn.transform(region) );
  record_for_igvn(region);
  return _gvn.transform(phi);
}

//-------------------------------gen_checkcast---------------------------------
// Generate a checkcast idiom.  Used by both the checkcast bytecode and the
// array store bytecode.  Stack must be as-if BEFORE doing the bytecode so the
// uncommon-trap paths work.  Adjust stack after this call.
// If failure_control is supplied and not null, it is filled in with
// the control edge for the cast failure.  Otherwise, an appropriate
// uncommon trap or exception is thrown.
Node* GraphKit::gen_checkcast(Node *obj, Node* superklass,
                              Node* *failure_control) {
  kill_dead_locals();           // Benefit all the uncommon traps
  const TypeKlassPtr *tk = _gvn.type(superklass)->is_klassptr();
  const Type *toop = TypeOopPtr::make_from_klass(tk->klass());

  // Fast cutout:  Check the case that the cast is vacuously true.
  // This detects the common cases where the test will short-circuit
  // away completely.  We do this before we perform the null check,
  // because if the test is going to turn into zero code, we don't
  // want a residual null check left around.  (Causes a slowdown,
  // for example, in some objArray manipulations, such as a[i]=a[j].)
  if (tk->singleton()) {
    const TypeOopPtr* objtp = _gvn.type(obj)->isa_oopptr();
    if (objtp != NULL && objtp->klass() != NULL) {
      switch (static_subtype_check(tk->klass(), objtp->klass())) {
      case SSC_always_true:
        return obj;
      case SSC_always_false:
        // It needs a null check because a null will *pass* the cast check.
        // A non-null value will always produce an exception.
2725
        return null_assert(obj);
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      }
    }
  }

  ciProfileData* data = NULL;
2731
  bool safe_for_replace = false;
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  if (failure_control == NULL) {        // use MDO in regular case only
    assert(java_bc() == Bytecodes::_aastore ||
           java_bc() == Bytecodes::_checkcast,
           "interpreter profiles type checks only for these BCs");
    data = method()->method_data()->bci_to_data(bci());
2737
    safe_for_replace = true;
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  }

  // Make the merge point
  enum { _obj_path = 1, _null_path, PATH_LIMIT };
2742 2743
  RegionNode* region = new (C) RegionNode(PATH_LIMIT);
  Node*       phi    = new (C) PhiNode(region, toop);
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  C->set_has_split_ifs(true); // Has chance for split-if optimization

  // Use null-cast information if it is available
2747 2748
  bool never_see_null = ((failure_control == NULL)  // regular case only
                         && seems_never_null(obj, data));
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  // Null check; get casted pointer; set region slot 3
  Node* null_ctl = top();
2752
  Node* not_null_obj = null_check_oop(obj, &null_ctl, never_see_null, safe_for_replace);
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  // If not_null_obj is dead, only null-path is taken
  if (stopped()) {              // Doing instance-of on a NULL?
    set_control(null_ctl);
    return null();
  }
  region->init_req(_null_path, null_ctl);
  phi   ->init_req(_null_path, null());  // Set null path value
2761 2762 2763 2764 2765 2766 2767
  if (null_ctl == top()) {
    // Do this eagerly, so that pattern matches like is_diamond_phi
    // will work even during parsing.
    assert(_null_path == PATH_LIMIT-1, "delete last");
    region->del_req(_null_path);
    phi   ->del_req(_null_path);
  }
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2769 2770
  Node* cast_obj = NULL;
  if (data != NULL &&
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      // Counter has never been decremented (due to cast failure).
      // ...This is a reasonable thing to expect.  It is true of
      // all casts inserted by javac to implement generic types.
2774 2775 2776 2777 2778 2779 2780
      data->as_CounterData()->count() >= 0) {
    cast_obj = maybe_cast_profiled_receiver(not_null_obj, data, tk->klass());
    if (cast_obj != NULL) {
      if (failure_control != NULL) // failure is now impossible
        (*failure_control) = top();
      // adjust the type of the phi to the exact klass:
      phi->raise_bottom_type(_gvn.type(cast_obj)->meet(TypePtr::NULL_PTR));
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    }
  }

  if (cast_obj == NULL) {
    // Load the object's klass
    Node* obj_klass = load_object_klass(not_null_obj);

    // Generate the subtype check
    Node* not_subtype_ctrl = gen_subtype_check( obj_klass, superklass );

    // Plug in success path into the merge
2792
    cast_obj = _gvn.transform(new (C) CheckCastPPNode(control(),
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                                                         not_null_obj, toop));
    // Failure path ends in uncommon trap (or may be dead - failure impossible)
    if (failure_control == NULL) {
      if (not_subtype_ctrl != top()) { // If failure is possible
        PreserveJVMState pjvms(this);
        set_control(not_subtype_ctrl);
        builtin_throw(Deoptimization::Reason_class_check, obj_klass);
      }
    } else {
      (*failure_control) = not_subtype_ctrl;
    }
  }

  region->init_req(_obj_path, control());
  phi   ->init_req(_obj_path, cast_obj);

  // A merge of NULL or Casted-NotNull obj
  Node* res = _gvn.transform(phi);

  // Note I do NOT always 'replace_in_map(obj,result)' here.
  //  if( tk->klass()->can_be_primary_super()  )
    // This means that if I successfully store an Object into an array-of-String
    // I 'forget' that the Object is really now known to be a String.  I have to
    // do this because we don't have true union types for interfaces - if I store
    // a Baz into an array-of-Interface and then tell the optimizer it's an
    // Interface, I forget that it's also a Baz and cannot do Baz-like field
    // references to it.  FIX THIS WHEN UNION TYPES APPEAR!
  //  replace_in_map( obj, res );

  // Return final merged results
  set_control( _gvn.transform(region) );
  record_for_igvn(region);
  return res;
}

//------------------------------next_monitor-----------------------------------
// What number should be given to the next monitor?
int GraphKit::next_monitor() {
  int current = jvms()->monitor_depth()* C->sync_stack_slots();
  int next = current + C->sync_stack_slots();
  // Keep the toplevel high water mark current:
  if (C->fixed_slots() < next)  C->set_fixed_slots(next);
  return current;
}

//------------------------------insert_mem_bar---------------------------------
// Memory barrier to avoid floating things around
// The membar serves as a pinch point between both control and all memory slices.
Node* GraphKit::insert_mem_bar(int opcode, Node* precedent) {
  MemBarNode* mb = MemBarNode::make(C, opcode, Compile::AliasIdxBot, precedent);
  mb->init_req(TypeFunc::Control, control());
  mb->init_req(TypeFunc::Memory,  reset_memory());
  Node* membar = _gvn.transform(mb);
2846
  set_control(_gvn.transform(new (C) ProjNode(membar, TypeFunc::Control)));
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  set_all_memory_call(membar);
  return membar;
}

//-------------------------insert_mem_bar_volatile----------------------------
// Memory barrier to avoid floating things around
// The membar serves as a pinch point between both control and memory(alias_idx).
// If you want to make a pinch point on all memory slices, do not use this
// function (even with AliasIdxBot); use insert_mem_bar() instead.
Node* GraphKit::insert_mem_bar_volatile(int opcode, int alias_idx, Node* precedent) {
  // When Parse::do_put_xxx updates a volatile field, it appends a series
  // of MemBarVolatile nodes, one for *each* volatile field alias category.
  // The first membar is on the same memory slice as the field store opcode.
  // This forces the membar to follow the store.  (Bug 6500685 broke this.)
  // All the other membars (for other volatile slices, including AliasIdxBot,
  // which stands for all unknown volatile slices) are control-dependent
  // on the first membar.  This prevents later volatile loads or stores
  // from sliding up past the just-emitted store.

  MemBarNode* mb = MemBarNode::make(C, opcode, alias_idx, precedent);
  mb->set_req(TypeFunc::Control,control());
  if (alias_idx == Compile::AliasIdxBot) {
    mb->set_req(TypeFunc::Memory, merged_memory()->base_memory());
  } else {
    assert(!(opcode == Op_Initialize && alias_idx != Compile::AliasIdxRaw), "fix caller");
    mb->set_req(TypeFunc::Memory, memory(alias_idx));
  }
  Node* membar = _gvn.transform(mb);
2875
  set_control(_gvn.transform(new (C) ProjNode(membar, TypeFunc::Control)));
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  if (alias_idx == Compile::AliasIdxBot) {
2877
    merged_memory()->set_base_memory(_gvn.transform(new (C) ProjNode(membar, TypeFunc::Memory)));
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  } else {
2879
    set_memory(_gvn.transform(new (C) ProjNode(membar, TypeFunc::Memory)),alias_idx);
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  }
  return membar;
}

//------------------------------shared_lock------------------------------------
// Emit locking code.
FastLockNode* GraphKit::shared_lock(Node* obj) {
  // bci is either a monitorenter bc or InvocationEntryBci
  // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces
  assert(SynchronizationEntryBCI == InvocationEntryBci, "");

  if( !GenerateSynchronizationCode )
    return NULL;                // Not locking things?
  if (stopped())                // Dead monitor?
    return NULL;

  assert(dead_locals_are_killed(), "should kill locals before sync. point");

  // Box the stack location
2899
  Node* box = _gvn.transform(new (C) BoxLockNode(next_monitor()));
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  Node* mem = reset_memory();

2902
  FastLockNode * flock = _gvn.transform(new (C) FastLockNode(0, obj, box) )->as_FastLock();
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  if (PrintPreciseBiasedLockingStatistics) {
    // Create the counters for this fast lock.
    flock->create_lock_counter(sync_jvms()); // sync_jvms used to get current bci
  }
  // Add monitor to debug info for the slow path.  If we block inside the
  // slow path and de-opt, we need the monitor hanging around
  map()->push_monitor( flock );

  const TypeFunc *tf = LockNode::lock_type();
2912
  LockNode *lock = new (C) LockNode(C, tf);
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  lock->init_req( TypeFunc::Control, control() );
  lock->init_req( TypeFunc::Memory , mem );
  lock->init_req( TypeFunc::I_O    , top() )     ;   // does no i/o
  lock->init_req( TypeFunc::FramePtr, frameptr() );
  lock->init_req( TypeFunc::ReturnAdr, top() );

  lock->init_req(TypeFunc::Parms + 0, obj);
  lock->init_req(TypeFunc::Parms + 1, box);
  lock->init_req(TypeFunc::Parms + 2, flock);
  add_safepoint_edges(lock);

  lock = _gvn.transform( lock )->as_Lock();

  // lock has no side-effects, sets few values
  set_predefined_output_for_runtime_call(lock, mem, TypeRawPtr::BOTTOM);

2930
  insert_mem_bar(Op_MemBarAcquireLock);
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  // Add this to the worklist so that the lock can be eliminated
  record_for_igvn(lock);

#ifndef PRODUCT
  if (PrintLockStatistics) {
    // Update the counter for this lock.  Don't bother using an atomic
    // operation since we don't require absolute accuracy.
    lock->create_lock_counter(map()->jvms());
2940
    increment_counter(lock->counter()->addr());
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  }
#endif

  return flock;
}


//------------------------------shared_unlock----------------------------------
// Emit unlocking code.
void GraphKit::shared_unlock(Node* box, Node* obj) {
  // bci is either a monitorenter bc or InvocationEntryBci
  // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces
  assert(SynchronizationEntryBCI == InvocationEntryBci, "");

  if( !GenerateSynchronizationCode )
    return;
  if (stopped()) {               // Dead monitor?
    map()->pop_monitor();        // Kill monitor from debug info
    return;
  }

  // Memory barrier to avoid floating things down past the locked region
2963
  insert_mem_bar(Op_MemBarReleaseLock);
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  const TypeFunc *tf = OptoRuntime::complete_monitor_exit_Type();
2966
  UnlockNode *unlock = new (C) UnlockNode(C, tf);
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  uint raw_idx = Compile::AliasIdxRaw;
  unlock->init_req( TypeFunc::Control, control() );
  unlock->init_req( TypeFunc::Memory , memory(raw_idx) );
  unlock->init_req( TypeFunc::I_O    , top() )     ;   // does no i/o
  unlock->init_req( TypeFunc::FramePtr, frameptr() );
  unlock->init_req( TypeFunc::ReturnAdr, top() );

  unlock->init_req(TypeFunc::Parms + 0, obj);
  unlock->init_req(TypeFunc::Parms + 1, box);
  unlock = _gvn.transform(unlock)->as_Unlock();

  Node* mem = reset_memory();

  // unlock has no side-effects, sets few values
  set_predefined_output_for_runtime_call(unlock, mem, TypeRawPtr::BOTTOM);

  // Kill monitor from debug info
  map()->pop_monitor( );
}

//-------------------------------get_layout_helper-----------------------------
// If the given klass is a constant or known to be an array,
// fetch the constant layout helper value into constant_value
// and return (Node*)NULL.  Otherwise, load the non-constant
// layout helper value, and return the node which represents it.
// This two-faced routine is useful because allocation sites
// almost always feature constant types.
Node* GraphKit::get_layout_helper(Node* klass_node, jint& constant_value) {
  const TypeKlassPtr* inst_klass = _gvn.type(klass_node)->isa_klassptr();
  if (!StressReflectiveCode && inst_klass != NULL) {
    ciKlass* klass = inst_klass->klass();
    bool    xklass = inst_klass->klass_is_exact();
    if (xklass || klass->is_array_klass()) {
      jint lhelper = klass->layout_helper();
      if (lhelper != Klass::_lh_neutral_value) {
        constant_value = lhelper;
        return (Node*) NULL;
      }
    }
  }
  constant_value = Klass::_lh_neutral_value;  // put in a known value
3008
  Node* lhp = basic_plus_adr(klass_node, klass_node, in_bytes(Klass::layout_helper_offset()));
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  return make_load(NULL, lhp, TypeInt::INT, T_INT);
}

// We just put in an allocate/initialize with a big raw-memory effect.
// Hook selected additional alias categories on the initialization.
static void hook_memory_on_init(GraphKit& kit, int alias_idx,
                                MergeMemNode* init_in_merge,
                                Node* init_out_raw) {
  DEBUG_ONLY(Node* init_in_raw = init_in_merge->base_memory());
  assert(init_in_merge->memory_at(alias_idx) == init_in_raw, "");

  Node* prevmem = kit.memory(alias_idx);
  init_in_merge->set_memory_at(alias_idx, prevmem);
  kit.set_memory(init_out_raw, alias_idx);
}

//---------------------------set_output_for_allocation-------------------------
Node* GraphKit::set_output_for_allocation(AllocateNode* alloc,
3027
                                          const TypeOopPtr* oop_type) {
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  int rawidx = Compile::AliasIdxRaw;
  alloc->set_req( TypeFunc::FramePtr, frameptr() );
  add_safepoint_edges(alloc);
  Node* allocx = _gvn.transform(alloc);
3032
  set_control( _gvn.transform(new (C) ProjNode(allocx, TypeFunc::Control) ) );
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  // create memory projection for i_o
3034
  set_memory ( _gvn.transform( new (C) ProjNode(allocx, TypeFunc::Memory, true) ), rawidx );
3035
  make_slow_call_ex(allocx, env()->Throwable_klass(), true);
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  // create a memory projection as for the normal control path
3038
  Node* malloc = _gvn.transform(new (C) ProjNode(allocx, TypeFunc::Memory));
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  set_memory(malloc, rawidx);

  // a normal slow-call doesn't change i_o, but an allocation does
  // we create a separate i_o projection for the normal control path
3043 3044
  set_i_o(_gvn.transform( new (C) ProjNode(allocx, TypeFunc::I_O, false) ) );
  Node* rawoop = _gvn.transform( new (C) ProjNode(allocx, TypeFunc::Parms) );
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  // put in an initialization barrier
  InitializeNode* init = insert_mem_bar_volatile(Op_Initialize, rawidx,
                                                 rawoop)->as_Initialize();
  assert(alloc->initialization() == init,  "2-way macro link must work");
  assert(init ->allocation()     == alloc, "2-way macro link must work");
3051
  {
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    // Extract memory strands which may participate in the new object's
    // initialization, and source them from the new InitializeNode.
    // This will allow us to observe initializations when they occur,
    // and link them properly (as a group) to the InitializeNode.
    assert(init->in(InitializeNode::Memory) == malloc, "");
    MergeMemNode* minit_in = MergeMemNode::make(C, malloc);
    init->set_req(InitializeNode::Memory, minit_in);
    record_for_igvn(minit_in); // fold it up later, if possible
    Node* minit_out = memory(rawidx);
    assert(minit_out->is_Proj() && minit_out->in(0) == init, "");
    if (oop_type->isa_aryptr()) {
      const TypePtr* telemref = oop_type->add_offset(Type::OffsetBot);
      int            elemidx  = C->get_alias_index(telemref);
      hook_memory_on_init(*this, elemidx, minit_in, minit_out);
    } else if (oop_type->isa_instptr()) {
      ciInstanceKlass* ik = oop_type->klass()->as_instance_klass();
      for (int i = 0, len = ik->nof_nonstatic_fields(); i < len; i++) {
        ciField* field = ik->nonstatic_field_at(i);
3070
        if (field->offset() >= TrackedInitializationLimit * HeapWordSize)
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          continue;  // do not bother to track really large numbers of fields
        // Find (or create) the alias category for this field:
        int fieldidx = C->alias_type(field)->index();
        hook_memory_on_init(*this, fieldidx, minit_in, minit_out);
      }
    }
  }

  // Cast raw oop to the real thing...
3080
  Node* javaoop = new (C) CheckCastPPNode(control(), rawoop, oop_type);
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  javaoop = _gvn.transform(javaoop);
  C->set_recent_alloc(control(), javaoop);
  assert(just_allocated_object(control()) == javaoop, "just allocated");

#ifdef ASSERT
3086 3087 3088 3089 3090
  { // Verify that the AllocateNode::Ideal_allocation recognizers work:
    assert(AllocateNode::Ideal_allocation(rawoop, &_gvn) == alloc,
           "Ideal_allocation works");
    assert(AllocateNode::Ideal_allocation(javaoop, &_gvn) == alloc,
           "Ideal_allocation works");
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3091
    if (alloc->is_AllocateArray()) {
3092 3093 3094 3095
      assert(AllocateArrayNode::Ideal_array_allocation(rawoop, &_gvn) == alloc->as_AllocateArray(),
             "Ideal_allocation works");
      assert(AllocateArrayNode::Ideal_array_allocation(javaoop, &_gvn) == alloc->as_AllocateArray(),
             "Ideal_allocation works");
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3096
    } else {
3097
      assert(alloc->in(AllocateNode::ALength)->is_top(), "no length, please");
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3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138
    }
  }
#endif //ASSERT

  return javaoop;
}

//---------------------------new_instance--------------------------------------
// This routine takes a klass_node which may be constant (for a static type)
// or may be non-constant (for reflective code).  It will work equally well
// for either, and the graph will fold nicely if the optimizer later reduces
// the type to a constant.
// The optional arguments are for specialized use by intrinsics:
//  - If 'extra_slow_test' if not null is an extra condition for the slow-path.
//  - If 'return_size_val', report the the total object size to the caller.
Node* GraphKit::new_instance(Node* klass_node,
                             Node* extra_slow_test,
                             Node* *return_size_val) {
  // Compute size in doublewords
  // The size is always an integral number of doublewords, represented
  // as a positive bytewise size stored in the klass's layout_helper.
  // The layout_helper also encodes (in a low bit) the need for a slow path.
  jint  layout_con = Klass::_lh_neutral_value;
  Node* layout_val = get_layout_helper(klass_node, layout_con);
  int   layout_is_con = (layout_val == NULL);

  if (extra_slow_test == NULL)  extra_slow_test = intcon(0);
  // Generate the initial go-slow test.  It's either ALWAYS (return a
  // Node for 1) or NEVER (return a NULL) or perhaps (in the reflective
  // case) a computed value derived from the layout_helper.
  Node* initial_slow_test = NULL;
  if (layout_is_con) {
    assert(!StressReflectiveCode, "stress mode does not use these paths");
    bool must_go_slow = Klass::layout_helper_needs_slow_path(layout_con);
    initial_slow_test = must_go_slow? intcon(1): extra_slow_test;

  } else {   // reflective case
    // This reflective path is used by Unsafe.allocateInstance.
    // (It may be stress-tested by specifying StressReflectiveCode.)
    // Basically, we want to get into the VM is there's an illegal argument.
    Node* bit = intcon(Klass::_lh_instance_slow_path_bit);
3139
    initial_slow_test = _gvn.transform( new (C) AndINode(layout_val, bit) );
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    if (extra_slow_test != intcon(0)) {
3141
      initial_slow_test = _gvn.transform( new (C) OrINode(initial_slow_test, extra_slow_test) );
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    }
    // (Macro-expander will further convert this to a Bool, if necessary.)
  }

  // Find the size in bytes.  This is easy; it's the layout_helper.
  // The size value must be valid even if the slow path is taken.
  Node* size = NULL;
  if (layout_is_con) {
    size = MakeConX(Klass::layout_helper_size_in_bytes(layout_con));
  } else {   // reflective case
    // This reflective path is used by clone and Unsafe.allocateInstance.
    size = ConvI2X(layout_val);

    // Clear the low bits to extract layout_helper_size_in_bytes:
    assert((int)Klass::_lh_instance_slow_path_bit < BytesPerLong, "clear bit");
    Node* mask = MakeConX(~ (intptr_t)right_n_bits(LogBytesPerLong));
3158
    size = _gvn.transform( new (C) AndXNode(size, mask) );
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  }
  if (return_size_val != NULL) {
    (*return_size_val) = size;
  }

  // This is a precise notnull oop of the klass.
  // (Actually, it need not be precise if this is a reflective allocation.)
  // It's what we cast the result to.
  const TypeKlassPtr* tklass = _gvn.type(klass_node)->isa_klassptr();
  if (!tklass)  tklass = TypeKlassPtr::OBJECT;
  const TypeOopPtr* oop_type = tklass->as_instance_type();

  // Now generate allocation code
3172

3173 3174 3175 3176
  // The entire memory state is needed for slow path of the allocation
  // since GC and deoptimization can happened.
  Node *mem = reset_memory();
  set_all_memory(mem); // Create new memory state
3177

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3178
  AllocateNode* alloc
3179
    = new (C) AllocateNode(C, AllocateNode::alloc_type(Type::TOP),
3180 3181 3182
                           control(), mem, i_o(),
                           size, klass_node,
                           initial_slow_test);
D
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3183

3184
  return set_output_for_allocation(alloc, oop_type);
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3185 3186 3187 3188 3189 3190 3191 3192
}

//-------------------------------new_array-------------------------------------
// helper for both newarray and anewarray
// The 'length' parameter is (obviously) the length of the array.
// See comments on new_instance for the meaning of the other arguments.
Node* GraphKit::new_array(Node* klass_node,     // array klass (maybe variable)
                          Node* length,         // number of array elements
3193
                          int   nargs,          // number of arguments to push back for uncommon trap
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                          Node* *return_size_val) {
  jint  layout_con = Klass::_lh_neutral_value;
  Node* layout_val = get_layout_helper(klass_node, layout_con);
  int   layout_is_con = (layout_val == NULL);

  if (!layout_is_con && !StressReflectiveCode &&
      !too_many_traps(Deoptimization::Reason_class_check)) {
    // This is a reflective array creation site.
    // Optimistically assume that it is a subtype of Object[],
    // so that we can fold up all the address arithmetic.
    layout_con = Klass::array_layout_helper(T_OBJECT);
3205 3206
    Node* cmp_lh = _gvn.transform( new(C) CmpINode(layout_val, intcon(layout_con)) );
    Node* bol_lh = _gvn.transform( new(C) BoolNode(cmp_lh, BoolTest::eq) );
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    { BuildCutout unless(this, bol_lh, PROB_MAX);
3208
      inc_sp(nargs);
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3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229
      uncommon_trap(Deoptimization::Reason_class_check,
                    Deoptimization::Action_maybe_recompile);
    }
    layout_val = NULL;
    layout_is_con = true;
  }

  // Generate the initial go-slow test.  Make sure we do not overflow
  // if length is huge (near 2Gig) or negative!  We do not need
  // exact double-words here, just a close approximation of needed
  // double-words.  We can't add any offset or rounding bits, lest we
  // take a size -1 of bytes and make it positive.  Use an unsigned
  // compare, so negative sizes look hugely positive.
  int fast_size_limit = FastAllocateSizeLimit;
  if (layout_is_con) {
    assert(!StressReflectiveCode, "stress mode does not use these paths");
    // Increase the size limit if we have exact knowledge of array type.
    int log2_esize = Klass::layout_helper_log2_element_size(layout_con);
    fast_size_limit <<= (LogBytesPerLong - log2_esize);
  }

3230 3231
  Node* initial_slow_cmp  = _gvn.transform( new (C) CmpUNode( length, intcon( fast_size_limit ) ) );
  Node* initial_slow_test = _gvn.transform( new (C) BoolNode( initial_slow_cmp, BoolTest::gt ) );
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3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258
  if (initial_slow_test->is_Bool()) {
    // Hide it behind a CMoveI, or else PhaseIdealLoop::split_up will get sick.
    initial_slow_test = initial_slow_test->as_Bool()->as_int_value(&_gvn);
  }

  // --- Size Computation ---
  // array_size = round_to_heap(array_header + (length << elem_shift));
  // where round_to_heap(x) == round_to(x, MinObjAlignmentInBytes)
  // and round_to(x, y) == ((x + y-1) & ~(y-1))
  // The rounding mask is strength-reduced, if possible.
  int round_mask = MinObjAlignmentInBytes - 1;
  Node* header_size = NULL;
  int   header_size_min  = arrayOopDesc::base_offset_in_bytes(T_BYTE);
  // (T_BYTE has the weakest alignment and size restrictions...)
  if (layout_is_con) {
    int       hsize  = Klass::layout_helper_header_size(layout_con);
    int       eshift = Klass::layout_helper_log2_element_size(layout_con);
    BasicType etype  = Klass::layout_helper_element_type(layout_con);
    if ((round_mask & ~right_n_bits(eshift)) == 0)
      round_mask = 0;  // strength-reduce it if it goes away completely
    assert((hsize & right_n_bits(eshift)) == 0, "hsize is pre-rounded");
    assert(header_size_min <= hsize, "generic minimum is smallest");
    header_size_min = hsize;
    header_size = intcon(hsize + round_mask);
  } else {
    Node* hss   = intcon(Klass::_lh_header_size_shift);
    Node* hsm   = intcon(Klass::_lh_header_size_mask);
3259 3260
    Node* hsize = _gvn.transform( new(C) URShiftINode(layout_val, hss) );
    hsize       = _gvn.transform( new(C) AndINode(hsize, hsm) );
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    Node* mask  = intcon(round_mask);
3262
    header_size = _gvn.transform( new(C) AddINode(hsize, mask) );
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  }

  Node* elem_shift = NULL;
  if (layout_is_con) {
    int eshift = Klass::layout_helper_log2_element_size(layout_con);
    if (eshift != 0)
      elem_shift = intcon(eshift);
  } else {
    // There is no need to mask or shift this value.
    // The semantics of LShiftINode include an implicit mask to 0x1F.
    assert(Klass::_lh_log2_element_size_shift == 0, "use shift in place");
    elem_shift = layout_val;
  }

  // Transition to native address size for all offset calculations:
  Node* lengthx = ConvI2X(length);
  Node* headerx = ConvI2X(header_size);
#ifdef _LP64
  { const TypeLong* tllen = _gvn.find_long_type(lengthx);
    if (tllen != NULL && tllen->_lo < 0) {
      // Add a manual constraint to a positive range.  Cf. array_element_address.
      jlong size_max = arrayOopDesc::max_array_length(T_BYTE);
      if (size_max > tllen->_hi)  size_max = tllen->_hi;
      const TypeLong* tlcon = TypeLong::make(CONST64(0), size_max, Type::WidenMin);
3287
      lengthx = _gvn.transform( new (C) ConvI2LNode(length, tlcon));
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    }
  }
#endif

  // Combine header size (plus rounding) and body size.  Then round down.
  // This computation cannot overflow, because it is used only in two
  // places, one where the length is sharply limited, and the other
  // after a successful allocation.
  Node* abody = lengthx;
  if (elem_shift != NULL)
3298 3299
    abody     = _gvn.transform( new(C) LShiftXNode(lengthx, elem_shift) );
  Node* size  = _gvn.transform( new(C) AddXNode(headerx, abody) );
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3300 3301
  if (round_mask != 0) {
    Node* mask = MakeConX(~round_mask);
3302
    size       = _gvn.transform( new(C) AndXNode(size, mask) );
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  }
  // else if round_mask == 0, the size computation is self-rounding

  if (return_size_val != NULL) {
    // This is the size
    (*return_size_val) = size;
  }

  // Now generate allocation code
3312

3313 3314 3315 3316
  // The entire memory state is needed for slow path of the allocation
  // since GC and deoptimization can happened.
  Node *mem = reset_memory();
  set_all_memory(mem); // Create new memory state
3317

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3318 3319
  // Create the AllocateArrayNode and its result projections
  AllocateArrayNode* alloc
3320
    = new (C) AllocateArrayNode(C, AllocateArrayNode::alloc_type(TypeInt::INT),
3321 3322 3323 3324
                                control(), mem, i_o(),
                                size, klass_node,
                                initial_slow_test,
                                length);
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3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336

  // Cast to correct type.  Note that the klass_node may be constant or not,
  // and in the latter case the actual array type will be inexact also.
  // (This happens via a non-constant argument to inline_native_newArray.)
  // In any case, the value of klass_node provides the desired array type.
  const TypeInt* length_type = _gvn.find_int_type(length);
  const TypeOopPtr* ary_type = _gvn.type(klass_node)->is_klassptr()->as_instance_type();
  if (ary_type->isa_aryptr() && length_type != NULL) {
    // Try to get a better type than POS for the size
    ary_type = ary_type->is_aryptr()->cast_to_size(length_type);
  }

3337
  Node* javaoop = set_output_for_allocation(alloc, ary_type);
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3338

3339 3340 3341 3342 3343 3344
  // Cast length on remaining path to be as narrow as possible
  if (map()->find_edge(length) >= 0) {
    Node* ccast = alloc->make_ideal_length(ary_type, &_gvn);
    if (ccast != length) {
      _gvn.set_type_bottom(ccast);
      record_for_igvn(ccast);
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3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360
      replace_in_map(length, ccast);
    }
  }

  return javaoop;
}

// The following "Ideal_foo" functions are placed here because they recognize
// the graph shapes created by the functions immediately above.

//---------------------------Ideal_allocation----------------------------------
// Given an oop pointer or raw pointer, see if it feeds from an AllocateNode.
AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase) {
  if (ptr == NULL) {     // reduce dumb test in callers
    return NULL;
  }
3361 3362 3363 3364 3365 3366 3367 3368
  if (ptr->is_CheckCastPP()) { // strip only one raw-to-oop cast
    ptr = ptr->in(1);
    if (ptr == NULL) return NULL;
  }
  // Return NULL for allocations with several casts:
  //   j.l.reflect.Array.newInstance(jobject, jint)
  //   Object.clone()
  // to keep more precise type from last cast.
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3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410
  if (ptr->is_Proj()) {
    Node* allo = ptr->in(0);
    if (allo != NULL && allo->is_Allocate()) {
      return allo->as_Allocate();
    }
  }
  // Report failure to match.
  return NULL;
}

// Fancy version which also strips off an offset (and reports it to caller).
AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase,
                                             intptr_t& offset) {
  Node* base = AddPNode::Ideal_base_and_offset(ptr, phase, offset);
  if (base == NULL)  return NULL;
  return Ideal_allocation(base, phase);
}

// Trace Initialize <- Proj[Parm] <- Allocate
AllocateNode* InitializeNode::allocation() {
  Node* rawoop = in(InitializeNode::RawAddress);
  if (rawoop->is_Proj()) {
    Node* alloc = rawoop->in(0);
    if (alloc->is_Allocate()) {
      return alloc->as_Allocate();
    }
  }
  return NULL;
}

// Trace Allocate -> Proj[Parm] -> Initialize
InitializeNode* AllocateNode::initialization() {
  ProjNode* rawoop = proj_out(AllocateNode::RawAddress);
  if (rawoop == NULL)  return NULL;
  for (DUIterator_Fast imax, i = rawoop->fast_outs(imax); i < imax; i++) {
    Node* init = rawoop->fast_out(i);
    if (init->is_Initialize()) {
      assert(init->as_Initialize()->allocation() == this, "2-way link");
      return init->as_Initialize();
    }
  }
  return NULL;
3411 3412
}

3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433
//----------------------------- loop predicates ---------------------------

//------------------------------add_predicate_impl----------------------------
void GraphKit::add_predicate_impl(Deoptimization::DeoptReason reason, int nargs) {
  // Too many traps seen?
  if (too_many_traps(reason)) {
#ifdef ASSERT
    if (TraceLoopPredicate) {
      int tc = C->trap_count(reason);
      tty->print("too many traps=%s tcount=%d in ",
                    Deoptimization::trap_reason_name(reason), tc);
      method()->print(); // which method has too many predicate traps
      tty->cr();
    }
#endif
    // We cannot afford to take more traps here,
    // do not generate predicate.
    return;
  }

  Node *cont    = _gvn.intcon(1);
3434 3435
  Node* opq     = _gvn.transform(new (C) Opaque1Node(C, cont));
  Node *bol     = _gvn.transform(new (C) Conv2BNode(opq));
3436
  IfNode* iff   = create_and_map_if(control(), bol, PROB_MAX, COUNT_UNKNOWN);
3437
  Node* iffalse = _gvn.transform(new (C) IfFalseNode(iff));
3438 3439 3440 3441
  C->add_predicate_opaq(opq);
  {
    PreserveJVMState pjvms(this);
    set_control(iffalse);
3442
    inc_sp(nargs);
3443 3444
    uncommon_trap(reason, Deoptimization::Action_maybe_recompile);
  }
3445
  Node* iftrue = _gvn.transform(new (C) IfTrueNode(iff));
3446 3447 3448 3449 3450 3451 3452 3453
  set_control(iftrue);
}

//------------------------------add_predicate---------------------------------
void GraphKit::add_predicate(int nargs) {
  if (UseLoopPredicate) {
    add_predicate_impl(Deoptimization::Reason_predicate, nargs);
  }
3454 3455 3456 3457
  // loop's limit check predicate should be near the loop.
  if (LoopLimitCheck) {
    add_predicate_impl(Deoptimization::Reason_loop_limit_check, nargs);
  }
3458 3459
}

3460 3461 3462 3463 3464
//----------------------------- store barriers ----------------------------
#define __ ideal.

void GraphKit::sync_kit(IdealKit& ideal) {
  set_all_memory(__ merged_memory());
3465
  set_i_o(__ i_o());
3466 3467 3468
  set_control(__ ctrl());
}

3469 3470 3471 3472 3473
void GraphKit::final_sync(IdealKit& ideal) {
  // Final sync IdealKit and graphKit.
  sync_kit(ideal);
}

3474 3475 3476 3477 3478 3479
// vanilla/CMS post barrier
// Insert a write-barrier store.  This is to let generational GC work; we have
// to flag all oop-stores before the next GC point.
void GraphKit::write_barrier_post(Node* oop_store,
                                  Node* obj,
                                  Node* adr,
3480
                                  uint  adr_idx,
3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494
                                  Node* val,
                                  bool use_precise) {
  // No store check needed if we're storing a NULL or an old object
  // (latter case is probably a string constant). The concurrent
  // mark sweep garbage collector, however, needs to have all nonNull
  // oop updates flagged via card-marks.
  if (val != NULL && val->is_Con()) {
    // must be either an oop or NULL
    const Type* t = val->bottom_type();
    if (t == TypePtr::NULL_PTR || t == Type::TOP)
      // stores of null never (?) need barriers
      return;
  }

3495 3496 3497
  if (use_ReduceInitialCardMarks()
      && obj == just_allocated_object(control())) {
    // We can skip marks on a freshly-allocated object in Eden.
3498 3499 3500 3501
    // Keep this code in sync with new_store_pre_barrier() in runtime.cpp.
    // That routine informs GC to take appropriate compensating steps,
    // upon a slow-path allocation, so as to make this card-mark
    // elision safe.
3502 3503 3504
    return;
  }

3505 3506 3507 3508 3509 3510 3511
  if (!use_precise) {
    // All card marks for a (non-array) instance are in one place:
    adr = obj;
  }
  // (Else it's an array (or unknown), and we want more precise card marks.)
  assert(adr != NULL, "");

3512
  IdealKit ideal(this, true);
3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526

  // Convert the pointer to an int prior to doing math on it
  Node* cast = __ CastPX(__ ctrl(), adr);

  // Divide by card size
  assert(Universe::heap()->barrier_set()->kind() == BarrierSet::CardTableModRef,
         "Only one we handle so far.");
  Node* card_offset = __ URShiftX( cast, __ ConI(CardTableModRefBS::card_shift) );

  // Combine card table base and card offset
  Node* card_adr = __ AddP(__ top(), byte_map_base_node(), card_offset );

  // Get the alias_index for raw card-mark memory
  int adr_type = Compile::AliasIdxRaw;
3527
  Node*   zero = __ ConI(0); // Dirty card value
3528
  BasicType bt = T_BYTE;
3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542

  if (UseCondCardMark) {
    // The classic GC reference write barrier is typically implemented
    // as a store into the global card mark table.  Unfortunately
    // unconditional stores can result in false sharing and excessive
    // coherence traffic as well as false transactional aborts.
    // UseCondCardMark enables MP "polite" conditional card mark
    // stores.  In theory we could relax the load from ctrl() to
    // no_ctrl, but that doesn't buy much latitude.
    Node* card_val = __ load( __ ctrl(), card_adr, TypeInt::BYTE, bt, adr_type);
    __ if_then(card_val, BoolTest::ne, zero);
  }

  // Smash zero into card
3543 3544 3545 3546
  if( !UseConcMarkSweepGC ) {
    __ store(__ ctrl(), card_adr, zero, bt, adr_type);
  } else {
    // Specialized path for CM store barrier
3547
    __ storeCM(__ ctrl(), card_adr, zero, oop_store, adr_idx, bt, adr_type);
3548 3549
  }

3550 3551 3552 3553
  if (UseCondCardMark) {
    __ end_if();
  }

3554
  // Final sync IdealKit and GraphKit.
3555
  final_sync(ideal);
3556 3557 3558
}

// G1 pre/post barriers
3559 3560
void GraphKit::g1_write_barrier_pre(bool do_load,
                                    Node* obj,
3561 3562 3563
                                    Node* adr,
                                    uint alias_idx,
                                    Node* val,
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                                    const TypeOopPtr* val_type,
3565
                                    Node* pre_val,
3566
                                    BasicType bt) {
3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579

  // Some sanity checks
  // Note: val is unused in this routine.

  if (do_load) {
    // We need to generate the load of the previous value
    assert(obj != NULL, "must have a base");
    assert(adr != NULL, "where are loading from?");
    assert(pre_val == NULL, "loaded already?");
    assert(val_type != NULL, "need a type");
  } else {
    // In this case both val_type and alias_idx are unused.
    assert(pre_val != NULL, "must be loaded already");
3580 3581
    // Nothing to be done if pre_val is null.
    if (pre_val->bottom_type() == TypePtr::NULL_PTR) return;
3582 3583 3584 3585
    assert(pre_val->bottom_type()->basic_type() == T_OBJECT, "or we shouldn't be here");
  }
  assert(bt == T_OBJECT, "or we shouldn't be here");

3586
  IdealKit ideal(this, true);
3587

3588
  Node* tls = __ thread(); // ThreadLocalStorage
3589 3590 3591

  Node* no_ctrl = NULL;
  Node* no_base = __ top();
3592 3593
  Node* zero  = __ ConI(0);
  Node* zeroX = __ ConX(0);
3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608

  float likely  = PROB_LIKELY(0.999);
  float unlikely  = PROB_UNLIKELY(0.999);

  BasicType active_type = in_bytes(PtrQueue::byte_width_of_active()) == 4 ? T_INT : T_BYTE;
  assert(in_bytes(PtrQueue::byte_width_of_active()) == 4 || in_bytes(PtrQueue::byte_width_of_active()) == 1, "flag width");

  // Offsets into the thread
  const int marking_offset = in_bytes(JavaThread::satb_mark_queue_offset() +  // 648
                                          PtrQueue::byte_offset_of_active());
  const int index_offset   = in_bytes(JavaThread::satb_mark_queue_offset() +  // 656
                                          PtrQueue::byte_offset_of_index());
  const int buffer_offset  = in_bytes(JavaThread::satb_mark_queue_offset() +  // 652
                                          PtrQueue::byte_offset_of_buf());

3609
  // Now the actual pointers into the thread
3610 3611 3612
  Node* marking_adr = __ AddP(no_base, tls, __ ConX(marking_offset));
  Node* buffer_adr  = __ AddP(no_base, tls, __ ConX(buffer_offset));
  Node* index_adr   = __ AddP(no_base, tls, __ ConX(index_offset));
3613 3614

  // Now some of the values
3615
  Node* marking = __ load(__ ctrl(), marking_adr, TypeInt::INT, active_type, Compile::AliasIdxRaw);
3616 3617 3618

  // if (!marking)
  __ if_then(marking, BoolTest::ne, zero); {
3619 3620 3621
    BasicType index_bt = TypeX_X->basic_type();
    assert(sizeof(size_t) == type2aelembytes(index_bt), "Loading G1 PtrQueue::_index with wrong size.");
    Node* index   = __ load(__ ctrl(), index_adr, TypeX_X, index_bt, Compile::AliasIdxRaw);
3622

3623
    if (do_load) {
3624 3625
      // load original value
      // alias_idx correct??
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      pre_val = __ load(__ ctrl(), adr, val_type, bt, alias_idx);
3627 3628 3629 3630 3631
    }

    // if (pre_val != NULL)
    __ if_then(pre_val, BoolTest::ne, null()); {
      Node* buffer  = __ load(__ ctrl(), buffer_adr, TypeRawPtr::NOTNULL, T_ADDRESS, Compile::AliasIdxRaw);
3632 3633

      // is the queue for this thread full?
3634
      __ if_then(index, BoolTest::ne, zeroX, likely); {
3635 3636

        // decrement the index
3637
        Node* next_index = _gvn.transform(new (C) SubXNode(index, __ ConX(sizeof(intptr_t))));
3638

3639
        // Now get the buffer location we will log the previous value into and store it
3640
        Node *log_addr = __ AddP(no_base, buffer, next_index);
3641
        __ store(__ ctrl(), log_addr, pre_val, T_OBJECT, Compile::AliasIdxRaw);
3642
        // update the index
3643
        __ store(__ ctrl(), index_adr, next_index, index_bt, Compile::AliasIdxRaw);
3644 3645 3646 3647 3648

      } __ else_(); {

        // logging buffer is full, call the runtime
        const TypeFunc *tf = OptoRuntime::g1_wb_pre_Type();
3649
        __ make_leaf_call(tf, CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), "g1_wb_pre", pre_val, tls);
3650
      } __ end_if();  // (!index)
3651
    } __ end_if();  // (pre_val != NULL)
3652
  } __ end_if();  // (!marking)
3653

3654
  // Final sync IdealKit and GraphKit.
3655
  final_sync(ideal);
3656 3657 3658 3659 3660
}

//
// Update the card table and add card address to the queue
//
3661 3662 3663
void GraphKit::g1_mark_card(IdealKit& ideal,
                            Node* card_adr,
                            Node* oop_store,
3664
                            uint oop_alias_idx,
3665 3666 3667 3668 3669
                            Node* index,
                            Node* index_adr,
                            Node* buffer,
                            const TypeFunc* tf) {

3670 3671
  Node* zero  = __ ConI(0);
  Node* zeroX = __ ConX(0);
3672 3673 3674
  Node* no_base = __ top();
  BasicType card_bt = T_BYTE;
  // Smash zero into card. MUST BE ORDERED WRT TO STORE
3675
  __ storeCM(__ ctrl(), card_adr, zero, oop_store, oop_alias_idx, card_bt, Compile::AliasIdxRaw);
3676 3677

  //  Now do the queue work
3678
  __ if_then(index, BoolTest::ne, zeroX); {
3679

3680 3681
    Node* next_index = _gvn.transform(new (C) SubXNode(index, __ ConX(sizeof(intptr_t))));
    Node* log_addr = __ AddP(no_base, buffer, next_index);
3682 3683

    __ store(__ ctrl(), log_addr, card_adr, T_ADDRESS, Compile::AliasIdxRaw);
3684
    __ store(__ ctrl(), index_adr, next_index, TypeX_X->basic_type(), Compile::AliasIdxRaw);
3685 3686 3687 3688

  } __ else_(); {
    __ make_leaf_call(tf, CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_post), "g1_wb_post", card_adr, __ thread());
  } __ end_if();
3689

3690 3691
}

3692
void GraphKit::g1_write_barrier_post(Node* oop_store,
3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715
                                     Node* obj,
                                     Node* adr,
                                     uint alias_idx,
                                     Node* val,
                                     BasicType bt,
                                     bool use_precise) {
  // If we are writing a NULL then we need no post barrier

  if (val != NULL && val->is_Con() && val->bottom_type() == TypePtr::NULL_PTR) {
    // Must be NULL
    const Type* t = val->bottom_type();
    assert(t == Type::TOP || t == TypePtr::NULL_PTR, "must be NULL");
    // No post barrier if writing NULLx
    return;
  }

  if (!use_precise) {
    // All card marks for a (non-array) instance are in one place:
    adr = obj;
  }
  // (Else it's an array (or unknown), and we want more precise card marks.)
  assert(adr != NULL, "");

3716
  IdealKit ideal(this, true);
3717

3718
  Node* tls = __ thread(); // ThreadLocalStorage
3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738

  Node* no_base = __ top();
  float likely  = PROB_LIKELY(0.999);
  float unlikely  = PROB_UNLIKELY(0.999);
  Node* zero = __ ConI(0);
  Node* zeroX = __ ConX(0);

  // Get the alias_index for raw card-mark memory
  const TypePtr* card_type = TypeRawPtr::BOTTOM;

  const TypeFunc *tf = OptoRuntime::g1_wb_post_Type();

  // Offsets into the thread
  const int index_offset  = in_bytes(JavaThread::dirty_card_queue_offset() +
                                     PtrQueue::byte_offset_of_index());
  const int buffer_offset = in_bytes(JavaThread::dirty_card_queue_offset() +
                                     PtrQueue::byte_offset_of_buf());

  // Pointers into the thread

3739 3740
  Node* buffer_adr = __ AddP(no_base, tls, __ ConX(buffer_offset));
  Node* index_adr =  __ AddP(no_base, tls, __ ConX(index_offset));
3741 3742

  // Now some values
3743 3744
  // Use ctrl to avoid hoisting these values past a safepoint, which could
  // potentially reset these fields in the JavaThread.
3745
  Node* index  = __ load(__ ctrl(), index_adr, TypeX_X, TypeX_X->basic_type(), Compile::AliasIdxRaw);
3746
  Node* buffer = __ load(__ ctrl(), buffer_adr, TypeRawPtr::NOTNULL, T_ADDRESS, Compile::AliasIdxRaw);
3747 3748 3749

  // Convert the store obj pointer to an int prior to doing math on it
  // Must use ctrl to prevent "integerized oop" existing across safepoint
3750
  Node* cast =  __ CastPX(__ ctrl(), adr);
3751 3752 3753 3754 3755

  // Divide pointer by card size
  Node* card_offset = __ URShiftX( cast, __ ConI(CardTableModRefBS::card_shift) );

  // Combine card table base and card offset
3756
  Node* card_adr = __ AddP(no_base, byte_map_base_node(), card_offset );
3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779

  // If we know the value being stored does it cross regions?

  if (val != NULL) {
    // Does the store cause us to cross regions?

    // Should be able to do an unsigned compare of region_size instead of
    // and extra shift. Do we have an unsigned compare??
    // Node* region_size = __ ConI(1 << HeapRegion::LogOfHRGrainBytes);
    Node* xor_res =  __ URShiftX ( __ XorX( cast,  __ CastPX(__ ctrl(), val)), __ ConI(HeapRegion::LogOfHRGrainBytes));

    // if (xor_res == 0) same region so skip
    __ if_then(xor_res, BoolTest::ne, zeroX); {

      // No barrier if we are storing a NULL
      __ if_then(val, BoolTest::ne, null(), unlikely); {

        // Ok must mark the card if not already dirty

        // load the original value of the card
        Node* card_val = __ load(__ ctrl(), card_adr, TypeInt::INT, T_BYTE, Compile::AliasIdxRaw);

        __ if_then(card_val, BoolTest::ne, zero); {
3780
          g1_mark_card(ideal, card_adr, oop_store, alias_idx, index, index_adr, buffer, tf);
3781 3782 3783 3784
        } __ end_if();
      } __ end_if();
    } __ end_if();
  } else {
3785
    // Object.clone() instrinsic uses this path.
3786
    g1_mark_card(ideal, card_adr, oop_store, alias_idx, index, index_adr, buffer, tf);
3787 3788
  }

3789
  // Final sync IdealKit and GraphKit.
3790
  final_sync(ideal);
3791
}
3792
#undef __
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Node* GraphKit::load_String_offset(Node* ctrl, Node* str) {
  if (java_lang_String::has_offset_field()) {
    int offset_offset = java_lang_String::offset_offset_in_bytes();
    const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(),
                                                       false, NULL, 0);
    const TypePtr* offset_field_type = string_type->add_offset(offset_offset);
    int offset_field_idx = C->get_alias_index(offset_field_type);
    return make_load(ctrl,
                     basic_plus_adr(str, str, offset_offset),
                     TypeInt::INT, T_INT, offset_field_idx);
  } else {
    return intcon(0);
  }
}

Node* GraphKit::load_String_length(Node* ctrl, Node* str) {
  if (java_lang_String::has_count_field()) {
    int count_offset = java_lang_String::count_offset_in_bytes();
    const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(),
                                                       false, NULL, 0);
    const TypePtr* count_field_type = string_type->add_offset(count_offset);
    int count_field_idx = C->get_alias_index(count_field_type);
    return make_load(ctrl,
                     basic_plus_adr(str, str, count_offset),
                     TypeInt::INT, T_INT, count_field_idx);
  } else {
    return load_array_length(load_String_value(ctrl, str));
  }
}

Node* GraphKit::load_String_value(Node* ctrl, Node* str) {
  int value_offset = java_lang_String::value_offset_in_bytes();
  const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(),
                                                     false, NULL, 0);
  const TypePtr* value_field_type = string_type->add_offset(value_offset);
  const TypeAryPtr*  value_type = TypeAryPtr::make(TypePtr::NotNull,
                                                   TypeAry::make(TypeInt::CHAR,TypeInt::POS),
                                                   ciTypeArrayKlass::make(T_CHAR), true, 0);
  int value_field_idx = C->get_alias_index(value_field_type);
3835 3836 3837 3838 3839 3840 3841
  Node* load = make_load(ctrl, basic_plus_adr(str, str, value_offset),
                         value_type, T_OBJECT, value_field_idx);
  // String.value field is known to be @Stable.
  if (UseImplicitStableValues) {
    load = cast_array_to_stable(load, value_type);
  }
  return load;
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}

void GraphKit::store_String_offset(Node* ctrl, Node* str, Node* value) {
  int offset_offset = java_lang_String::offset_offset_in_bytes();
  const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(),
                                                     false, NULL, 0);
  const TypePtr* offset_field_type = string_type->add_offset(offset_offset);
  int offset_field_idx = C->get_alias_index(offset_field_type);
  store_to_memory(ctrl, basic_plus_adr(str, offset_offset),
                  value, T_INT, offset_field_idx);
}

void GraphKit::store_String_value(Node* ctrl, Node* str, Node* value) {
  int value_offset = java_lang_String::value_offset_in_bytes();
  const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(),
                                                     false, NULL, 0);
  const TypePtr* value_field_type = string_type->add_offset(value_offset);
3859 3860 3861

  store_oop_to_object(ctrl, str,  basic_plus_adr(str, value_offset), value_field_type,
      value, TypeAryPtr::CHARS, T_OBJECT);
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}

void GraphKit::store_String_length(Node* ctrl, Node* str, Node* value) {
  int count_offset = java_lang_String::count_offset_in_bytes();
  const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(),
                                                     false, NULL, 0);
  const TypePtr* count_field_type = string_type->add_offset(count_offset);
  int count_field_idx = C->get_alias_index(count_field_type);
  store_to_memory(ctrl, basic_plus_adr(str, count_offset),
                  value, T_INT, count_field_idx);
}
3873 3874 3875 3876 3877 3878

Node* GraphKit::cast_array_to_stable(Node* ary, const TypeAryPtr* ary_type) {
  // Reify the property as a CastPP node in Ideal graph to comply with monotonicity
  // assumption of CCP analysis.
  return _gvn.transform(new(C) CastPPNode(ary, ary_type->cast_to_stable(true)));
}