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Java example source code file (sharkContext.cpp)

This example Java source code file (sharkContext.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

arraytype::get, functiontype\:\:get, null, pointertype::getunqual, sharkcontext\:\:pop_from_free_queue, sharkcontext\:\:push_to_free_queue, sharkfreequeueitem, t_address, t_array, t_char, t_conflict, t_double, t_float, t_long

The sharkContext.cpp Java example source code

/*
 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2009, 2010 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 "oops/arrayOop.hpp"
#include "oops/oop.hpp"
#include "shark/llvmHeaders.hpp"
#include "shark/sharkContext.hpp"
#include "utilities/globalDefinitions.hpp"
#include "memory/allocation.hpp"

using namespace llvm;

SharkContext::SharkContext(const char* name)
  : LLVMContext(),
    _free_queue(NULL) {
  // Create a module to build our functions into
  _module = new Module(name, *this);

  // Create basic types
  _void_type    = Type::getVoidTy(*this);
  _bit_type     = Type::getInt1Ty(*this);
  _jbyte_type   = Type::getInt8Ty(*this);
  _jshort_type  = Type::getInt16Ty(*this);
  _jint_type    = Type::getInt32Ty(*this);
  _jlong_type   = Type::getInt64Ty(*this);
  _jfloat_type  = Type::getFloatTy(*this);
  _jdouble_type = Type::getDoubleTy(*this);

  // Create compound types
  _itableOffsetEntry_type = PointerType::getUnqual(
    ArrayType::get(jbyte_type(), itableOffsetEntry::size() * wordSize));

  _Metadata_type = PointerType::getUnqual(
    ArrayType::get(jbyte_type(), sizeof(Metadata)));

  _klass_type = PointerType::getUnqual(
    ArrayType::get(jbyte_type(), sizeof(Klass)));

  _jniEnv_type = PointerType::getUnqual(
    ArrayType::get(jbyte_type(), sizeof(JNIEnv)));

  _jniHandleBlock_type = PointerType::getUnqual(
    ArrayType::get(jbyte_type(), sizeof(JNIHandleBlock)));

  _Method_type = PointerType::getUnqual(
    ArrayType::get(jbyte_type(), sizeof(Method)));

  _monitor_type = ArrayType::get(
    jbyte_type(), frame::interpreter_frame_monitor_size() * wordSize);

  _oop_type = PointerType::getUnqual(
    ArrayType::get(jbyte_type(), sizeof(oopDesc)));

  _thread_type = PointerType::getUnqual(
    ArrayType::get(jbyte_type(), sizeof(JavaThread)));

  _zeroStack_type = PointerType::getUnqual(
    ArrayType::get(jbyte_type(), sizeof(ZeroStack)));

  std::vector<Type*> params;
  params.push_back(Method_type());
  params.push_back(intptr_type());
  params.push_back(thread_type());
  _entry_point_type = FunctionType::get(jint_type(), params, false);

  params.clear();
  params.push_back(Method_type());
  params.push_back(PointerType::getUnqual(jbyte_type()));
  params.push_back(intptr_type());
  params.push_back(thread_type());
  _osr_entry_point_type = FunctionType::get(jint_type(), params, false);

  // Create mappings
  for (int i = 0; i < T_CONFLICT; i++) {
    switch (i) {
    case T_BOOLEAN:
      _to_stackType[i] = jint_type();
      _to_arrayType[i] = jbyte_type();
      break;

    case T_BYTE:
      _to_stackType[i] = jint_type();
      _to_arrayType[i] = jbyte_type();
      break;

    case T_CHAR:
      _to_stackType[i] = jint_type();
      _to_arrayType[i] = jshort_type();
      break;

    case T_SHORT:
      _to_stackType[i] = jint_type();
      _to_arrayType[i] = jshort_type();
      break;

    case T_INT:
      _to_stackType[i] = jint_type();
      _to_arrayType[i] = jint_type();
      break;

    case T_LONG:
      _to_stackType[i] = jlong_type();
      _to_arrayType[i] = jlong_type();
      break;

    case T_FLOAT:
      _to_stackType[i] = jfloat_type();
      _to_arrayType[i] = jfloat_type();
      break;

    case T_DOUBLE:
      _to_stackType[i] = jdouble_type();
      _to_arrayType[i] = jdouble_type();
      break;

    case T_OBJECT:
    case T_ARRAY:
      _to_stackType[i] = oop_type();
      _to_arrayType[i] = oop_type();
      break;

    case T_ADDRESS:
      _to_stackType[i] = intptr_type();
      _to_arrayType[i] = NULL;
      break;

    default:
      _to_stackType[i] = NULL;
      _to_arrayType[i] = NULL;
    }
  }
}

class SharkFreeQueueItem : public CHeapObj<mtNone> {
 public:
  SharkFreeQueueItem(llvm::Function* function, SharkFreeQueueItem *next)
    : _function(function), _next(next) {}

 private:
  llvm::Function*     _function;
  SharkFreeQueueItem* _next;

 public:
  llvm::Function* function() const {
    return _function;
  }
  SharkFreeQueueItem* next() const {
    return _next;
  }
};

void SharkContext::push_to_free_queue(Function* function) {
  _free_queue = new SharkFreeQueueItem(function, _free_queue);
}

Function* SharkContext::pop_from_free_queue() {
  if (_free_queue == NULL)
    return NULL;

  SharkFreeQueueItem *item = _free_queue;
  Function *function = item->function();
  _free_queue = item->next();
  delete item;
  return function;
}

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