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Java example source code file (sharkMemoryManager.hpp)

This example Java source code file (sharkMemoryManager.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

abortonfailure, actualsize, alignment, frameregister, functionend, functionstart, sectionid, share_vm_shark_sharkmemorymanager_hpp, sharkentry, size, stubsize, tableend

The sharkMemoryManager.hpp Java example source code

/*
 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 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_SHARKMEMORYMANAGER_HPP
#define SHARE_VM_SHARK_SHARKMEMORYMANAGER_HPP

#include "shark/llvmHeaders.hpp"
#include "shark/sharkEntry.hpp"

// SharkMemoryManager wraps the LLVM JIT Memory Manager.  We could use
// this to run our own memory allocation policies, but for now all we
// use it for is figuring out where the resulting native code ended up.

class SharkMemoryManager : public llvm::JITMemoryManager {
 public:
  SharkMemoryManager()
    : _mm(llvm::JITMemoryManager::CreateDefaultMemManager()) {}

 private:
  llvm::JITMemoryManager* _mm;

 private:
  llvm::JITMemoryManager* mm() const {
    return _mm;
  }

 private:
  std::map<const llvm::Function*, SharkEntry*> _entry_map;

 public:
  void set_entry_for_function(const llvm::Function* function,
                              SharkEntry*           entry) {
    _entry_map[function] = entry;
  }
  SharkEntry* get_entry_for_function(const llvm::Function* function) {
    return _entry_map[function];
  }

 public:
  void AllocateGOT();
  unsigned char* getGOTBase() const;
  unsigned char* allocateStub(const llvm::GlobalValue* F,
                              unsigned StubSize,
                              unsigned Alignment);
  unsigned char* startFunctionBody(const llvm::Function* F,
                                   uintptr_t& ActualSize);
  void endFunctionBody(const llvm::Function* F,
                       unsigned char* FunctionStart,
                       unsigned char* FunctionEnd);
  unsigned char* startExceptionTable(const llvm::Function* F,
                                     uintptr_t& ActualSize);
  void endExceptionTable(const llvm::Function* F,
                         unsigned char* TableStart,
                         unsigned char* TableEnd,
                         unsigned char* FrameRegister);
  void *getPointerToNamedFunction(const std::string &Name, bool AbortOnFailure = true);
  uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment, unsigned SectionID);
  uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment, unsigned SectionID);
  void setPoisonMemory(bool);
  uint8_t* allocateGlobal(uintptr_t, unsigned int);
  void setMemoryWritable();
  void setMemoryExecutable();
  void deallocateExceptionTable(void *ptr);
  void deallocateFunctionBody(void *ptr);
  unsigned char *allocateSpace(intptr_t Size,
                               unsigned int Alignment);
};

#endif // SHARE_VM_SHARK_SHARKMEMORYMANAGER_HPP

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