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Java example source code file (sharkFunction.cpp)

This example Java source code file (sharkFunction.cpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

argument, basicblock, deferredzerocheck, function\:\:arg_iterator, function\:\:create, globalvariable\:\:internallinkage, null, osr, sharkfunction\:\:initialize, sharkstack\:\:createbuildandpushframe, sharkstate, sharktargetinvariants, sharktoplevelblock, sharkvalue

The sharkFunction.cpp Java example source code

/*
 * 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();
}

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