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 /*

  * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.

  * Copyright 2008, 2009 Red Hat, Inc.

  * 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 "ci/ciType.hpp"

 #include "ci/ciTypeFlow.hpp"

 #include "memory/allocation.hpp"

 #include "shark/sharkBuilder.hpp"

 #include "shark/sharkCacheDecache.hpp"

 #include "shark/sharkState.hpp"

 #include "shark/sharkTopLevelBlock.hpp"

 #include "shark/sharkType.hpp"

 #include "shark/sharkValue.hpp"

 using namespace llvm;

 void SharkState::initialize(const SharkState *state) {

   _locals = NEW_RESOURCE_ARRAY(SharkValue*, max_locals());

   _stack  = NEW_RESOURCE_ARRAY(SharkValue*, max_stack());

   NOT_PRODUCT(memset(_locals, 23, max_locals() * sizeof(SharkValue *)));

   NOT_PRODUCT(memset(_stack,  23, max_stack()  * sizeof(SharkValue *)));

   _sp = _stack;

   if (state) {

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

       SharkValue *value = state->local(i);

       if (value)

         value = value->clone();

       set_local(i, value);

     }

     for (int i = state->stack_depth() - 1; i >= 0; i--) {

       SharkValue *value = state->stack(i);

       if (value)

         value = value->clone();

       push(value);

     }

   }

   set_num_monitors(state ? state->num_monitors() : 0);

 }

 bool SharkState::equal_to(SharkState *other) {

   if (target() != other->target())

     return false;

   if (method() != other->method())

     return false;

   if (oop_tmp() != other->oop_tmp())

     return false;

   if (max_locals() != other->max_locals())

     return false;

   if (stack_depth() != other->stack_depth())

     return false;

   if (num_monitors() != other->num_monitors())

     return false;

   if (has_safepointed() != other->has_safepointed())

     return false;

   // Local variables

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

     SharkValue *value = local(i);

     SharkValue *other_value = other->local(i);

     if (value == NULL) {

       if (other_value != NULL)

         return false;

     }

     else {

       if (other_value == NULL)

         return false;

       if (!value->equal_to(other_value))

         return false;

     }

   }

   // Expression stack

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

     SharkValue *value = stack(i);

     SharkValue *other_value = other->stack(i);

     if (value == NULL) {

       if (other_value != NULL)

         return false;

     }

     else {

       if (other_value == NULL)

         return false;

       if (!value->equal_to(other_value))

         return false;

     }

   }

   return true;

 }

 void SharkState::merge(SharkState* other,

                        BasicBlock* other_block,

                        BasicBlock* this_block) {

   // Method

   Value *this_method = this->method();

   Value *other_method = other->method();

   if (this_method != other_method) {

     PHINode *phi = builder()->CreatePHI(SharkType::Method_type(), 0, "method");

     phi->addIncoming(this_method, this_block);

     phi->addIncoming(other_method, other_block);

     set_method(phi);

   }

   // Temporary oop slot

   Value *this_oop_tmp = this->oop_tmp();

   Value *other_oop_tmp = other->oop_tmp();

   if (this_oop_tmp != other_oop_tmp) {

     assert(this_oop_tmp && other_oop_tmp, "can't merge NULL with non-NULL");

     PHINode *phi = builder()->CreatePHI(SharkType::oop_type(), 0, "oop_tmp");

     phi->addIncoming(this_oop_tmp, this_block);

     phi->addIncoming(other_oop_tmp, other_block);

     set_oop_tmp(phi);

   }

   // Monitors

   assert(this->num_monitors() == other->num_monitors(), "should be");

   // Local variables

   assert(this->max_locals() == other->max_locals(), "should be");

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

     SharkValue *this_value = this->local(i);

     SharkValue *other_value = other->local(i);

     assert((this_value == NULL) == (other_value == NULL), "should be");

     if (this_value != NULL) {

       char name[18];

       snprintf(name, sizeof(name), "local_%d_", i);

       set_local(i, this_value->merge(

         builder(), other_value, other_block, this_block, name));

     }

   }

   // Expression stack

   assert(this->stack_depth() == other->stack_depth(), "should be");

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

     SharkValue *this_value = this->stack(i);

     SharkValue *other_value = other->stack(i);

     assert((this_value == NULL) == (other_value == NULL), "should be");

     if (this_value != NULL) {

       char name[18];

       snprintf(name, sizeof(name), "stack_%d_", i);

       set_stack(i, this_value->merge(

         builder(), other_value, other_block, this_block, name));

     }

   }

   // Safepointed status

   set_has_safepointed(this->has_safepointed() && other->has_safepointed());

 }

 void SharkState::replace_all(SharkValue* old_value, SharkValue* new_value) {

   // Local variables

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

     if (local(i) == old_value)

       set_local(i, new_value);

   }

   // Expression stack

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

     if (stack(i) == old_value)

       set_stack(i, new_value);

   }

 }

 SharkNormalEntryState::SharkNormalEntryState(SharkTopLevelBlock* block,

                                              Value*              method)

   : SharkState(block) {

   assert(!block->stack_depth_at_entry(), "entry block shouldn't have stack");

   // Local variables

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

     ciType *type = block->local_type_at_entry(i);

     SharkValue *value = NULL;

     switch (type->basic_type()) {

     case T_INT:

     case T_LONG:

     case T_FLOAT:

     case T_DOUBLE:

     case T_OBJECT:

     case T_ARRAY:

       if (i >= arg_size()) {

         ShouldNotReachHere();

       }

       value = SharkValue::create_generic(type, NULL, i == 0 && !is_static());

       break;

     case ciTypeFlow::StateVector::T_NULL:

       value = SharkValue::null();

       break;

     case ciTypeFlow::StateVector::T_BOTTOM:

       break;

     case ciTypeFlow::StateVector::T_LONG2:

     case ciTypeFlow::StateVector::T_DOUBLE2:

       break;

     default:

       ShouldNotReachHere();

     }

     set_local(i, value);

   }

   SharkNormalEntryCacher(block->function(), method).scan(this);

 }

 SharkOSREntryState::SharkOSREntryState(SharkTopLevelBlock* block,

                                        Value*              method,

                                        Value*              osr_buf)

   : SharkState(block) {

   assert(block->stack_depth_at_entry() == 0, "entry block shouldn't have stack");

   set_num_monitors(block->ciblock()->monitor_count());

   // Local variables

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

     ciType *type = block->local_type_at_entry(i);

     SharkValue *value = NULL;

     switch (type->basic_type()) {

     case T_INT:

     case T_LONG:

     case T_FLOAT:

     case T_DOUBLE:

     case T_OBJECT:

     case T_ARRAY:

       value = SharkValue::create_generic(type, NULL, false);

       break;

     case ciTypeFlow::StateVector::T_NULL:

       value = SharkValue::null();

       break;

     case ciTypeFlow::StateVector::T_BOTTOM:

       break;

     case ciTypeFlow::StateVector::T_LONG2:

     case ciTypeFlow::StateVector::T_DOUBLE2:

       break;

     default:

       ShouldNotReachHere();

     }

     set_local(i, value);

   }

   SharkOSREntryCacher(block->function(), method, osr_buf).scan(this);

 }

 SharkPHIState::SharkPHIState(SharkTopLevelBlock* block)

   : SharkState(block), _block(block) {

   BasicBlock *saved_insert_point = builder()->GetInsertBlock();

   builder()->SetInsertPoint(block->entry_block());

   char name[18];

   // Method

   set_method(builder()->CreatePHI(SharkType::Method_type(), 0, "method"));

   // Local variables

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

     ciType *type = block->local_type_at_entry(i);

     if (type->basic_type() == (BasicType) ciTypeFlow::StateVector::T_NULL) {

       // XXX we could do all kinds of clever stuff here

       type = ciType::make(T_OBJECT); // XXX what about T_ARRAY?

     }

     SharkValue *value = NULL;

     switch (type->basic_type()) {

     case T_INT:

     case T_LONG:

     case T_FLOAT:

     case T_DOUBLE:

     case T_OBJECT:

     case T_ARRAY:

       snprintf(name, sizeof(name), "local_%d_", i);

       value = SharkValue::create_phi(

         type, builder()->CreatePHI(SharkType::to_stackType(type), 0, name));

       break;

     case T_ADDRESS:

       value = SharkValue::address_constant(type->as_return_address()->bci());

       break;

     case ciTypeFlow::StateVector::T_BOTTOM:

       break;

     case ciTypeFlow::StateVector::T_LONG2:

     case ciTypeFlow::StateVector::T_DOUBLE2:

       break;

     default:

       ShouldNotReachHere();

     }

     set_local(i, value);

   }

   // Expression stack

   for (int i = 0; i < block->stack_depth_at_entry(); i++) {

     ciType *type = block->stack_type_at_entry(i);

     if (type->basic_type() == (BasicType) ciTypeFlow::StateVector::T_NULL) {

       // XXX we could do all kinds of clever stuff here

       type = ciType::make(T_OBJECT); // XXX what about T_ARRAY?

     }

     SharkValue *value = NULL;

     switch (type->basic_type()) {

     case T_INT:

     case T_LONG:

     case T_FLOAT:

     case T_DOUBLE:

     case T_OBJECT:

     case T_ARRAY:

       snprintf(name, sizeof(name), "stack_%d_", i);

       value = SharkValue::create_phi(

         type, builder()->CreatePHI(SharkType::to_stackType(type), 0, name));

       break;

     case T_ADDRESS:

       value = SharkValue::address_constant(type->as_return_address()->bci());

       break;

     case ciTypeFlow::StateVector::T_LONG2:

     case ciTypeFlow::StateVector::T_DOUBLE2:

       break;

     default:

       ShouldNotReachHere();

     }

     push(value);

   }

   // Monitors

   set_num_monitors(block->ciblock()->monitor_count());

   builder()->SetInsertPoint(saved_insert_point);

 }

 void SharkPHIState::add_incoming(SharkState* incoming_state) {

   BasicBlock *predecessor = builder()->GetInsertBlock();

   // Method

   ((PHINode *) method())->addIncoming(incoming_state->method(), predecessor);

   // Local variables

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

     if (local(i) != NULL)

       local(i)->addIncoming(incoming_state->local(i), predecessor);

   }

   // Expression stack

   int stack_depth = block()->stack_depth_at_entry();

   assert(stack_depth == incoming_state->stack_depth(), "should be");

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

     assert((stack(i) == NULL) == (incoming_state->stack(i) == NULL), "oops");

     if (stack(i))

       stack(i)->addIncoming(incoming_state->stack(i), predecessor);

   }

   // Monitors

   assert(num_monitors() == incoming_state->num_monitors(), "should be");

   // Temporary oop slot

   assert(oop_tmp() == incoming_state->oop_tmp(), "should be");

 }