/*

 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "code/codeCache.hpp"

#include "code/debugInfoRec.hpp"

#include "code/nmethod.hpp"

#include "code/pcDesc.hpp"

#include "code/scopeDesc.hpp"

#include "interpreter/interpreter.hpp"

#include "interpreter/oopMapCache.hpp"

#include "oops/instanceKlass.hpp"

#include "oops/oop.inline.hpp"

#include "runtime/basicLock.hpp"

#include "runtime/handles.inline.hpp"

#include "runtime/monitorChunk.hpp"

#include "runtime/signature.hpp"

#include "runtime/stubRoutines.hpp"

#include "runtime/vframeArray.hpp"

#include "runtime/vframe_hp.hpp"

#ifdef COMPILER2

#include "opto/matcher.hpp"

#endif

// ------------- compiledVFrame --------------

StackValueCollection* compiledVFrame::locals() const {

  // Natives has no scope

  if (scope() == NULL) return new StackValueCollection(0);

  GrowableArray<ScopeValue*>*  scv_list = scope()->locals();

  if (scv_list == NULL) return new StackValueCollection(0);

  // scv_list is the list of ScopeValues describing the JVM stack state.

  // There is one scv_list entry for every JVM stack state in use.

  int length = scv_list->length();

  StackValueCollection* result = new StackValueCollection(length);

  // In rare instances set_locals may have occurred in which case

  // there are local values that are not described by the ScopeValue anymore

  GrowableArray<jvmtiDeferredLocalVariable*>* deferred = NULL;

  GrowableArray<jvmtiDeferredLocalVariableSet*>* list = thread()->deferred_locals();

  if (list != NULL ) {

    // In real life this never happens or is typically a single element search

    for (int i = 0; i < list->length(); i++) {

      if (list->at(i)->matches((vframe*)this)) {

        deferred = list->at(i)->locals();

        break;

      }

    }

  }

  for( int i = 0; i < length; i++ ) {

    result->add( create_stack_value(scv_list->at(i)) );

  }

  // Replace specified locals with any deferred writes that are present

  if (deferred != NULL) {

    for ( int l = 0;  l < deferred->length() ; l ++) {

      jvmtiDeferredLocalVariable* val = deferred->at(l);

      switch (val->type()) {

      case T_BOOLEAN:

        result->set_int_at(val->index(), val->value().z);

        break;

      case T_CHAR:

        result->set_int_at(val->index(), val->value().c);

        break;

      case T_FLOAT:

        result->set_float_at(val->index(), val->value().f);

        break;

      case T_DOUBLE:

        result->set_double_at(val->index(), val->value().d);

        break;

      case T_BYTE:

        result->set_int_at(val->index(), val->value().b);

        break;

      case T_SHORT:

        result->set_int_at(val->index(), val->value().s);

        break;

      case T_INT:

        result->set_int_at(val->index(), val->value().i);

        break;

      case T_LONG:

        result->set_long_at(val->index(), val->value().j);

        break;

      case T_OBJECT:

        {

          Handle obj((oop)val->value().l);

          result->set_obj_at(val->index(), obj);

        }

        break;

      default:

        ShouldNotReachHere();

      }

    }

  }

  return result;

}

void compiledVFrame::set_locals(StackValueCollection* values) const {

  fatal("Should use update_local for each local update");

}

void compiledVFrame::update_local(BasicType type, int index, jvalue value) {

#ifdef ASSERT

  assert(fr().is_deoptimized_frame(), "frame must be scheduled for deoptimization");

#endif /* ASSERT */

  GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = thread()->deferred_locals();

  if (deferred != NULL ) {

    // See if this vframe has already had locals with deferred writes

    int f;

    for ( f = 0 ; f < deferred->length() ; f++ ) {

      if (deferred->at(f)->matches(this)) {

        // Matching, vframe now see if the local already had deferred write

        GrowableArray<jvmtiDeferredLocalVariable*>* locals = deferred->at(f)->locals();

        int l;

        for (l = 0 ; l < locals->length() ; l++ ) {

          if (locals->at(l)->index() == index) {

            locals->at(l)->set_value(value);

            return;

          }

        }

        // No matching local already present. Push a new value onto the deferred collection

        locals->push(new jvmtiDeferredLocalVariable(index, type, value));

        return;

      }

    }

    // No matching vframe must push a new vframe

  } else {

    // No deferred updates pending for this thread.

    // allocate in C heap

    deferred =  new(ResourceObj::C_HEAP) GrowableArray<jvmtiDeferredLocalVariableSet*> (1, true);

    thread()->set_deferred_locals(deferred);

  }

  deferred->push(new jvmtiDeferredLocalVariableSet(method(), bci(), fr().id()));

  assert(deferred->top()->id() == fr().id(), "Huh? Must match");

  deferred->top()->set_local_at(index, type, value);

}

StackValueCollection* compiledVFrame::expressions() const {

  // Natives has no scope

  if (scope() == NULL) return new StackValueCollection(0);

  GrowableArray<ScopeValue*>*  scv_list = scope()->expressions();

  if (scv_list == NULL) return new StackValueCollection(0);

  // scv_list is the list of ScopeValues describing the JVM stack state.

  // There is one scv_list entry for every JVM stack state in use.

  int length = scv_list->length();

  StackValueCollection* result = new StackValueCollection(length);

  for( int i = 0; i < length; i++ )

    result->add( create_stack_value(scv_list->at(i)) );

  return result;

}

// The implementation of the following two methods was factorized into the

// class StackValue because it is also used from within deoptimization.cpp for

// rematerialization and relocking of non-escaping objects.

StackValue *compiledVFrame::create_stack_value(ScopeValue *sv) const {

  return StackValue::create_stack_value(&_fr, register_map(), sv);

}

BasicLock* compiledVFrame::resolve_monitor_lock(Location location) const {

  return StackValue::resolve_monitor_lock(&_fr, location);

}

GrowableArray<MonitorInfo*>* compiledVFrame::monitors() const {

  // Natives has no scope

  if (scope() == NULL) {

    nmethod* nm = code();

    methodOop method = nm->method();

    assert(method->is_native(), "");

    if (!method->is_synchronized()) {

      return new GrowableArray<MonitorInfo*>(0);

    }

    // This monitor is really only needed for UseBiasedLocking, but

    // return it in all cases for now as it might be useful for stack

    // traces and tools as well

    GrowableArray<MonitorInfo*> *monitors = new GrowableArray<MonitorInfo*>(1);

    // Casting away const

    frame& fr = (frame&) _fr;

    monitors->push(info);

    return monitors;

  }

  GrowableArray<MonitorValue*>* monitors = scope()->monitors();

  if (monitors == NULL) {

    return new GrowableArray<MonitorInfo*>(0);

  }

  GrowableArray<MonitorInfo*>* result = new GrowableArray<MonitorInfo*>(monitors->length());

  for (int index = 0; index < monitors->length(); index++) {

    MonitorValue* mv = monitors->at(index);

    ScopeValue*   ov = mv->owner();

    StackValue *owner_sv = create_stack_value(ov); // it is an oop

    if (ov->is_object() && owner_sv->obj_is_scalar_replaced()) { // The owner object was scalar replaced

      assert(mv->eliminated(), "monitor should be eliminated for scalar replaced object");

      // Put klass for scalar replaced object.

      ScopeValue* kv = ((ObjectValue *)ov)->klass();

      assert(kv->is_constant_oop(), "klass should be oop constant for scalar replaced object");

      KlassHandle k(((ConstantOopReadValue*)kv)->value()());

      result->push(new MonitorInfo(k->as_klassOop(), resolve_monitor_lock(mv->basic_lock()),

                                   mv->eliminated(), true));

    } else {

      result->push(new MonitorInfo(owner_sv->get_obj()(), resolve_monitor_lock(mv->basic_lock()),

                                   mv->eliminated(), false));

    }

  }

  return result;

}

compiledVFrame::compiledVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread, nmethod* nm)

: javaVFrame(fr, reg_map, thread) {

  _scope  = NULL;

  // Compiled method (native stub or Java code)

  // native wrappers have no scope data, it is implied

  if (!nm->is_native_method()) {

    _scope  = nm->scope_desc_at(_fr.pc());

  }

}

compiledVFrame::compiledVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread, ScopeDesc* scope)

: javaVFrame(fr, reg_map, thread) {

  _scope  = scope;

  guarantee(_scope != NULL, "scope must be present");

}

bool compiledVFrame::is_top() const {

  // FIX IT: Remove this when new native stubs are in place

  if (scope() == NULL) return true;

  return scope()->is_top();

}

nmethod* compiledVFrame::code() const {

  return CodeCache::find_nmethod(_fr.pc());

}

methodOop compiledVFrame::method() const {

  if (scope() == NULL) {

    // native nmethods have no scope the method is implied

    nmethod* nm = code();

    assert(nm->is_native_method(), "must be native");

    return nm->method();

  }

  return scope()->method()();

}

int compiledVFrame::bci() const {

  int raw = raw_bci();

  return raw == SynchronizationEntryBCI ? 0 : raw;

}

int compiledVFrame::raw_bci() const {

  if (scope() == NULL) {

    // native nmethods have no scope the method/bci is implied

    nmethod* nm = code();

    assert(nm->is_native_method(), "must be native");

    return 0;

  }

  return scope()->bci();

}

bool compiledVFrame::should_reexecute() const {

  if (scope() == NULL) {

    // native nmethods have no scope the method/bci is implied

    nmethod* nm = code();

    assert(nm->is_native_method(), "must be native");

    return false;

  }

  return scope()->should_reexecute();

}

vframe* compiledVFrame::sender() const {

  const frame f = fr();

  if (scope() == NULL) {

    // native nmethods have no scope the method/bci is implied

    nmethod* nm = code();

    assert(nm->is_native_method(), "must be native");

    return vframe::sender();

  } else {

    return scope()->is_top()

      ? vframe::sender()

      : new compiledVFrame(&f, register_map(), thread(), scope()->sender());

  }

}

jvmtiDeferredLocalVariableSet::jvmtiDeferredLocalVariableSet(methodOop method, int bci, intptr_t* id) {

  _method = method;

  _bci = bci;

  _id = id;

  // Alway will need at least one, must be on C heap

  _locals = new(ResourceObj::C_HEAP) GrowableArray<jvmtiDeferredLocalVariable*> (1, true);

}

jvmtiDeferredLocalVariableSet::~jvmtiDeferredLocalVariableSet() {

  for (int i = 0; i < _locals->length() ; i++ ) {

    delete _locals->at(i);

  }

  // Free growableArray and c heap for elements

  delete _locals;

}

bool jvmtiDeferredLocalVariableSet::matches(vframe* vf) {

  if (!vf->is_compiled_frame()) return false;

  compiledVFrame* cvf = (compiledVFrame*)vf;

  return cvf->fr().id() == id() && cvf->method() == method() && cvf->bci() == bci();

}

void jvmtiDeferredLocalVariableSet::set_local_at(int idx, BasicType type, jvalue val) {

  int i;

  for ( i = 0 ; i < locals()->length() ; i++ ) {

    if ( locals()->at(i)->index() == idx) {

      assert(locals()->at(i)->type() == type, "Wrong type");

      locals()->at(i)->set_value(val);

      return;

    }

  }

  locals()->push(new jvmtiDeferredLocalVariable(idx, type, val));

}

void jvmtiDeferredLocalVariableSet::oops_do(OopClosure* f) {

  f->do_oop((oop*) &_method);

  for ( int i = 0; i < locals()->length(); i++ ) {

    if ( locals()->at(i)->type() == T_OBJECT) {

      f->do_oop(locals()->at(i)->oop_addr());

    }

  }

}

jvmtiDeferredLocalVariable::jvmtiDeferredLocalVariable(int index, BasicType type, jvalue value) {

  _index = index;

  _type = type;

  _value = value;

}

#ifndef PRODUCT

void compiledVFrame::verify() const {

  Unimplemented();

}

#endif // PRODUCT