Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1999, 2013, 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/ciTypeFlow.hpp"

 #include "memory/allocation.hpp"

 #include "shark/llvmHeaders.hpp"

 #include "shark/llvmValue.hpp"

 #include "shark/sharkBuilder.hpp"

 #include "shark/sharkEntry.hpp"

 #include "shark/sharkFunction.hpp"

 #include "shark/sharkState.hpp"

 #include "shark/sharkTopLevelBlock.hpp"

 #include "shark/shark_globals.hpp"

 #include "utilities/debug.hpp"

 using namespace llvm;

 void SharkFunction::initialize(const char *name) {

   // Create the function

   _function = Function::Create(

     entry_point_type(),

     GlobalVariable::InternalLinkage,

     name);

   // Get our arguments

   Function::arg_iterator ai = function()->arg_begin();

   Argument *method = ai++;

   method->setName("method");

   Argument *osr_buf = NULL;

   if (is_osr()) {

     osr_buf = ai++;

     osr_buf->setName("osr_buf");

   }

   Argument *base_pc = ai++;

   base_pc->setName("base_pc");

   code_buffer()->set_base_pc(base_pc);

   Argument *thread = ai++;

   thread->setName("thread");

   set_thread(thread);

   // Create the list of blocks

   set_block_insertion_point(NULL);

   _blocks = NEW_RESOURCE_ARRAY(SharkTopLevelBlock*, block_count());

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

     ciTypeFlow::Block *b = flow()->pre_order_at(i);

     // Work around a bug in pre_order_at() that does not return

     // the correct pre-ordering.  If pre_order_at() were correct

     // this line could simply be:

     // _blocks[i] = new SharkTopLevelBlock(this, b);

     _blocks[b->pre_order()] = new SharkTopLevelBlock(this, b);

   }

   // Walk the tree from the start block to determine which

   // blocks are entered and which blocks require phis

   SharkTopLevelBlock *start_block = block(flow()->start_block_num());

   if (is_osr() && start_block->stack_depth_at_entry() != 0) {

     env()->record_method_not_compilable("can't compile OSR block with incoming stack-depth > 0");

     return;

   }

   assert(start_block->start() == flow()->start_bci(), "blocks out of order");

   start_block->enter();

   // Initialize all entered blocks

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

     if (block(i)->entered())

       block(i)->initialize();

   }

   // Create and push our stack frame

   set_block_insertion_point(&function()->front());

   builder()->SetInsertPoint(CreateBlock());

   _stack = SharkStack::CreateBuildAndPushFrame(this, method);

   // Create the entry state

   SharkState *entry_state;

   if (is_osr()) {

     entry_state = new SharkOSREntryState(start_block, method, osr_buf);

     // Free the OSR buffer

     builder()->CreateCall(builder()->osr_migration_end(), osr_buf);

   }

   else {

     entry_state = new SharkNormalEntryState(start_block, method);

     // Lock if necessary

     if (is_synchronized()) {

       SharkTopLevelBlock *locker =

         new SharkTopLevelBlock(this, start_block->ciblock());

       locker->add_incoming(entry_state);

       set_block_insertion_point(start_block->entry_block());

       locker->acquire_method_lock();

       entry_state = locker->current_state();

     }

   }

   // Transition into the method proper

   start_block->add_incoming(entry_state);

   builder()->CreateBr(start_block->entry_block());

   // Parse the blocks

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

     if (!block(i)->entered())

       continue;

     if (i + 1 < block_count())

       set_block_insertion_point(block(i + 1)->entry_block());

     else

       set_block_insertion_point(NULL);

     block(i)->emit_IR();

   }

   do_deferred_zero_checks();

 }

 class DeferredZeroCheck : public SharkTargetInvariants {

  public:

   DeferredZeroCheck(SharkTopLevelBlock* block, SharkValue* value)

     : SharkTargetInvariants(block),

       _block(block),

       _value(value),

       _bci(block->bci()),

       _state(block->current_state()->copy()),

       _check_block(builder()->GetInsertBlock()),

       _continue_block(function()->CreateBlock("not_zero")) {

     builder()->SetInsertPoint(continue_block());

   }

  private:

   SharkTopLevelBlock* _block;

   SharkValue*         _value;

   int                 _bci;

   SharkState*         _state;

   BasicBlock*         _check_block;

   BasicBlock*         _continue_block;

  public:

   SharkTopLevelBlock* block() const {

     return _block;

   }

   SharkValue* value() const {

     return _value;

   }

   int bci() const {

     return _bci;

   }

   SharkState* state() const {

     return _state;

   }

   BasicBlock* check_block() const {

     return _check_block;

   }

   BasicBlock* continue_block() const {

     return _continue_block;

   }

  public:

   SharkFunction* function() const {

     return block()->function();

   }

  public:

   void process() const {

     builder()->SetInsertPoint(check_block());

     block()->do_deferred_zero_check(value(), bci(), state(), continue_block());

   }

 };

 void SharkFunction::add_deferred_zero_check(SharkTopLevelBlock* block,

                                             SharkValue*         value) {

   deferred_zero_checks()->append(new DeferredZeroCheck(block, value));

 }

 void SharkFunction::do_deferred_zero_checks() {

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

     deferred_zero_checks()->at(i)->process();

 }