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Java example source code file (sharkInvariants.hpp)

This example Java source code file (sharkInvariants.hpp) 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

debuginformationrecorder, dependencies, null, resourceobj, share_vm_shark_sharkinvariants_hpp, sharkbuilder, sharkcodebuffer, sharkcompileinvariants, sharktargetinvariants

The sharkInvariants.hpp 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.
 *
 */

#ifndef SHARE_VM_SHARK_SHARKINVARIANTS_HPP
#define SHARE_VM_SHARK_SHARKINVARIANTS_HPP

#include "ci/ciEnv.hpp"
#include "ci/ciInstanceKlass.hpp"
#include "ci/ciMethod.hpp"
#include "ci/ciTypeFlow.hpp"
#include "code/debugInfoRec.hpp"
#include "code/dependencies.hpp"
#include "memory/allocation.hpp"
#include "shark/llvmHeaders.hpp"
#include "shark/sharkBuilder.hpp"

// Base classes used to track various values through the compilation.
// SharkCompileInvariants is used to track values which remain the
// same for the top-level method and any inlined methods it may have
// (ie for the whole compilation).  SharkTargetInvariants is used to
// track values which differ between methods.

class SharkCompileInvariants : public ResourceObj {
 protected:
  SharkCompileInvariants(ciEnv* env, SharkBuilder* builder)
    : _env(env),
      _builder(builder),
      _thread(NULL) {}

  SharkCompileInvariants(const SharkCompileInvariants* parent)
    : _env(parent->_env),
      _builder(parent->_builder),
      _thread(parent->_thread) {}

 private:
  ciEnv*        _env;
  SharkBuilder* _builder;
  llvm::Value*  _thread;

  // Top-level broker for HotSpot's Compiler Interface.
  //
  // Its main purpose is to allow the various CI classes to access
  // oops in the VM without having to worry about safepointing.  In
  // addition to this it acts as a holder for various recorders and
  // memory allocators.
  //
  // Accessing this directly is kind of ugly, so it's private.  Add
  // new accessors below if you need something from it.
 protected:
  ciEnv* env() const {
    assert(_env != NULL, "env not available");
    return _env;
  }

  // The SharkBuilder that is used to build LLVM IR.
 protected:
  SharkBuilder* builder() const {
    return _builder;
  }

  // Pointer to this thread's JavaThread object.  This is not
  // available until a short way into SharkFunction creation
  // so a setter is required.  Assertions are used to enforce
  // invariance.
 protected:
  llvm::Value* thread() const {
    assert(_thread != NULL, "thread not available");
    return _thread;
  }
  void set_thread(llvm::Value* thread) {
    assert(_thread == NULL, "thread already set");
    _thread = thread;
  }

  // Objects that handle various aspects of the compilation.
 protected:
  DebugInformationRecorder* debug_info() const {
    return env()->debug_info();
  }
  SharkCodeBuffer* code_buffer() const {
    return builder()->code_buffer();
  }

 public:
  Dependencies* dependencies() const {
    return env()->dependencies();
  }

  // Commonly used classes
 protected:
  ciInstanceKlass* java_lang_Object_klass() const {
    return env()->Object_klass();
  }
  ciInstanceKlass* java_lang_Throwable_klass() const {
    return env()->Throwable_klass();
  }
};

class SharkTargetInvariants : public SharkCompileInvariants {
 protected:
  SharkTargetInvariants(ciEnv* env, SharkBuilder* builder, ciTypeFlow* flow)
    : SharkCompileInvariants(env, builder),
      _target(flow->method()),
      _flow(flow),
      _max_monitors(count_monitors()) {}

  SharkTargetInvariants(const SharkCompileInvariants* parent, ciMethod* target)
    : SharkCompileInvariants(parent),
      _target(target),
      _flow(NULL),
      _max_monitors(count_monitors()) {}

  SharkTargetInvariants(const SharkTargetInvariants* parent)
    : SharkCompileInvariants(parent),
      _target(parent->_target),
      _flow(parent->_flow),
      _max_monitors(parent->_max_monitors) {}

 private:
  int count_monitors();

 private:
  ciMethod*   _target;
  ciTypeFlow* _flow;
  int         _max_monitors;

  // The method being compiled.
 protected:
  ciMethod* target() const {
    return _target;
  }

  // Typeflow analysis of the method being compiled.
 protected:
  ciTypeFlow* flow() const {
    assert(_flow != NULL, "typeflow not available");
    return _flow;
  }

  // Properties of the method.
 protected:
  int max_locals() const {
    return target()->max_locals();
  }
  int max_stack() const {
    return target()->max_stack();
  }
  int max_monitors() const {
    return _max_monitors;
  }
  int arg_size() const {
    return target()->arg_size();
  }
  bool is_static() const {
    return target()->is_static();
  }
  bool is_synchronized() const {
    return target()->is_synchronized();
  }
};

#endif // SHARE_VM_SHARK_SHARKINVARIANTS_HPP

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