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 /*

  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.

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

  *

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

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

  * published by the Free Software Foundation.

  *

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

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

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

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

  * accompanied this code).

  *

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

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

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

  *

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

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

  * questions.

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  */

 #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, mtCompiler) 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();

     Method* 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;

     MonitorInfo* info = new MonitorInfo(

         fr.get_native_receiver(), fr.get_native_monitor(), false, false);

     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");

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

       assert(java_lang_Class::is_instance(k()), "must be");

       result->push(new MonitorInfo(k(), 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());

 }

 Method* 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(Method* 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, mtCompiler) 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) {

   // The Method* is on the stack so a live activation keeps it alive

   // either by mirror in interpreter or code in compiled code.

   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