sharkMemoryManager.hpp

/*
 * Copyright (c) 1999, 2007, 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
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// 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);
#if SHARK_LLVM_VERSION < 27
  void* getDlsymTable() const;
  void SetDlsymTable(void *ptr);
#endif
  void setPoisonMemory(bool);
  uint8_t* allocateGlobal(uintptr_t, unsigned int);
  void setMemoryWritable();
  void setMemoryExecutable();
#if SHARK_LLVM_VERSION >= 27
  void deallocateExceptionTable(void *ptr);
  void deallocateFunctionBody(void *ptr);
#else
  void deallocateMemForFunction(const llvm::Function* F);
#endif
  unsigned char *allocateSpace(intptr_t Size,
                               unsigned int Alignment);
};