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Java example source code file (codeBlob.hpp)

This example Java source code file (codeBlob.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.

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Java - Java tags/keywords

adapterblob, bufferblob, codeblob, codebuffer, deoptimizationblob, exceptionblob, methodhandlesadapterblob, oopclosure, oopmapset, registermap, share_vm_code_codeblob_hpp, singletonblob, uncommontrapblob, vmstructs

The codeBlob.hpp Java example source code

/*
 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
 * 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_CODE_CODEBLOB_HPP
#define SHARE_VM_CODE_CODEBLOB_HPP

#include "asm/codeBuffer.hpp"
#include "compiler/oopMap.hpp"
#include "runtime/frame.hpp"
#include "runtime/handles.hpp"

// CodeBlob - superclass for all entries in the CodeCache.
//
// Suptypes are:
//   nmethod            : Compiled Java methods (include method that calls to native code)
//   RuntimeStub        : Call to VM runtime methods
//   DeoptimizationBlob : Used for deoptimizatation
//   ExceptionBlob      : Used for stack unrolling
//   SafepointBlob      : Used to handle illegal instruction exceptions
//
//
// Layout:
//   - header
//   - relocation
//   - content space
//     - instruction space
//   - data space
class DeoptimizationBlob;

class CodeBlob VALUE_OBJ_CLASS_SPEC {

  friend class VMStructs;

 private:
  const char* _name;
  int        _size;                              // total size of CodeBlob in bytes
  int        _header_size;                       // size of header (depends on subclass)
  int        _relocation_size;                   // size of relocation
  int        _content_offset;                    // offset to where content region begins (this includes consts, insts, stubs)
  int        _code_offset;                       // offset to where instructions region begins (this includes insts, stubs)
  int        _frame_complete_offset;             // instruction offsets in [0.._frame_complete_offset) have
                                                 // not finished setting up their frame. Beware of pc's in
                                                 // that range. There is a similar range(s) on returns
                                                 // which we don't detect.
  int        _data_offset;                       // offset to where data region begins
  int        _frame_size;                        // size of stack frame
  OopMapSet* _oop_maps;                          // OopMap for this CodeBlob
  CodeStrings _strings;

 public:
  // Returns the space needed for CodeBlob
  static unsigned int allocation_size(CodeBuffer* cb, int header_size);

  // Creation
  // a) simple CodeBlob
  // frame_complete is the offset from the beginning of the instructions
  // to where the frame setup (from stackwalk viewpoint) is complete.
  CodeBlob(const char* name, int header_size, int size, int frame_complete, int locs_size);

  // b) full CodeBlob
  CodeBlob(
    const char* name,
    CodeBuffer* cb,
    int         header_size,
    int         size,
    int         frame_complete,
    int         frame_size,
    OopMapSet*  oop_maps
  );

  // Deletion
  void flush();

  // Typing
  virtual bool is_buffer_blob() const            { return false; }
  virtual bool is_nmethod() const                { return false; }
  virtual bool is_runtime_stub() const           { return false; }
  virtual bool is_deoptimization_stub() const    { return false; }
  virtual bool is_uncommon_trap_stub() const     { return false; }
  virtual bool is_exception_stub() const         { return false; }
  virtual bool is_safepoint_stub() const              { return false; }
  virtual bool is_adapter_blob() const                { return false; }
  virtual bool is_method_handles_adapter_blob() const { return false; }

  virtual bool is_compiled_by_c2() const         { return false; }
  virtual bool is_compiled_by_c1() const         { return false; }

  // Casting
  nmethod* as_nmethod_or_null()                  { return is_nmethod() ? (nmethod*) this : NULL; }

  // Boundaries
  address    header_begin() const                { return (address)    this; }
  address    header_end() const                  { return ((address)   this) + _header_size; };
  relocInfo* relocation_begin() const            { return (relocInfo*) header_end(); };
  relocInfo* relocation_end() const              { return (relocInfo*)(header_end()   + _relocation_size); }
  address    content_begin() const               { return (address)    header_begin() + _content_offset; }
  address    content_end() const                 { return (address)    header_begin() + _data_offset; }
  address    code_begin() const                  { return (address)    header_begin() + _code_offset; }
  address    code_end() const                    { return (address)    header_begin() + _data_offset; }
  address    data_begin() const                  { return (address)    header_begin() + _data_offset; }
  address    data_end() const                    { return (address)    header_begin() + _size; }

  // Offsets
  int relocation_offset() const                  { return _header_size; }
  int content_offset() const                     { return _content_offset; }
  int code_offset() const                        { return _code_offset; }
  int data_offset() const                        { return _data_offset; }

  // Sizes
  int size() const                               { return _size; }
  int header_size() const                        { return _header_size; }
  int relocation_size() const                    { return (address) relocation_end() - (address) relocation_begin(); }
  int content_size() const                       { return           content_end()    -           content_begin();    }
  int code_size() const                          { return           code_end()       -           code_begin();       }
  int data_size() const                          { return           data_end()       -           data_begin();       }

  // Containment
  bool blob_contains(address addr) const         { return header_begin()       <= addr && addr < data_end();       }
  bool relocation_contains(relocInfo* addr) const{ return relocation_begin()   <= addr && addr < relocation_end(); }
  bool content_contains(address addr) const      { return content_begin()      <= addr && addr < content_end();    }
  bool code_contains(address addr) const         { return code_begin()         <= addr && addr < code_end();       }
  bool data_contains(address addr) const         { return data_begin()         <= addr && addr < data_end();       }
  bool contains(address addr) const              { return content_contains(addr); }
  bool is_frame_complete_at(address addr) const  { return code_contains(addr) &&
                                                          addr >= code_begin() + _frame_complete_offset; }

  // CodeCache support: really only used by the nmethods, but in order to get
  // asserts and certain bookkeeping to work in the CodeCache they are defined
  // virtual here.
  virtual bool is_zombie() const                 { return false; }
  virtual bool is_locked_by_vm() const           { return false; }

  virtual bool is_unloaded() const               { return false; }
  virtual bool is_not_entrant() const            { return false; }

  // GC support
  virtual bool is_alive() const                  = 0;

  // OopMap for frame
  OopMapSet* oop_maps() const                    { return _oop_maps; }
  void set_oop_maps(OopMapSet* p);
  OopMap* oop_map_for_return_address(address return_address);
  virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f)  { ShouldNotReachHere(); }

  // Frame support
  int  frame_size() const                        { return _frame_size; }
  void set_frame_size(int size)                  { _frame_size = size; }

  // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
  virtual bool caller_must_gc_arguments(JavaThread* thread) const { return false; }

  // Naming
  const char* name() const                       { return _name; }
  void set_name(const char* name)                { _name = name; }

  // Debugging
  virtual void verify();
  void print() const                             { print_on(tty); }
  virtual void print_on(outputStream* st) const;
  virtual void print_value_on(outputStream* st) const;

  // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
  static void trace_new_stub(CodeBlob* blob, const char* name1, const char* name2 = "");

  // Print the comment associated with offset on stream, if there is one
  virtual void print_block_comment(outputStream* stream, address block_begin) const {
    intptr_t offset = (intptr_t)(block_begin - code_begin());
    _strings.print_block_comment(stream, offset);
  }

  // Transfer ownership of comments to this CodeBlob
  void set_strings(CodeStrings& strings) {
    _strings.assign(strings);
  }
};


//----------------------------------------------------------------------------------------------------
// BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.

class BufferBlob: public CodeBlob {
  friend class VMStructs;
  friend class AdapterBlob;
  friend class MethodHandlesAdapterBlob;

 private:
  // Creation support
  BufferBlob(const char* name, int size);
  BufferBlob(const char* name, int size, CodeBuffer* cb);

  void* operator new(size_t s, unsigned size, bool is_critical = false) throw();

 public:
  // Creation
  static BufferBlob* create(const char* name, int buffer_size);
  static BufferBlob* create(const char* name, CodeBuffer* cb);

  static void free(BufferBlob* buf);

  // Typing
  virtual bool is_buffer_blob() const            { return true; }

  // GC/Verification support
  void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f)  { /* nothing to do */ }
  bool is_alive() const                          { return true; }

  void verify();
  void print_on(outputStream* st) const;
  void print_value_on(outputStream* st) const;
};


//----------------------------------------------------------------------------------------------------
// AdapterBlob: used to hold C2I/I2C adapters

class AdapterBlob: public BufferBlob {
private:
  AdapterBlob(int size, CodeBuffer* cb);

public:
  // Creation
  static AdapterBlob* create(CodeBuffer* cb);

  // Typing
  virtual bool is_adapter_blob() const { return true; }
};


//----------------------------------------------------------------------------------------------------
// MethodHandlesAdapterBlob: used to hold MethodHandles adapters

class MethodHandlesAdapterBlob: public BufferBlob {
private:
  MethodHandlesAdapterBlob(int size)                 : BufferBlob("MethodHandles adapters", size) {}

public:
  // Creation
  static MethodHandlesAdapterBlob* create(int buffer_size);

  // Typing
  virtual bool is_method_handles_adapter_blob() const { return true; }
};


//----------------------------------------------------------------------------------------------------
// RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine

class RuntimeStub: public CodeBlob {
  friend class VMStructs;
 private:
  bool        _caller_must_gc_arguments;

  // Creation support
  RuntimeStub(
    const char* name,
    CodeBuffer* cb,
    int         size,
    int         frame_complete,
    int         frame_size,
    OopMapSet*  oop_maps,
    bool        caller_must_gc_arguments
  );

  void* operator new(size_t s, unsigned size) throw();

 public:
  // Creation
  static RuntimeStub* new_runtime_stub(
    const char* stub_name,
    CodeBuffer* cb,
    int         frame_complete,
    int         frame_size,
    OopMapSet*  oop_maps,
    bool        caller_must_gc_arguments
  );

  // Typing
  bool is_runtime_stub() const                   { return true; }

  // GC support
  bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }

  address entry_point()                          { return code_begin(); }

  // GC/Verification support
  void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f)  { /* nothing to do */ }
  bool is_alive() const                          { return true; }

  void verify();
  void print_on(outputStream* st) const;
  void print_value_on(outputStream* st) const;
};


//----------------------------------------------------------------------------------------------------
// Super-class for all blobs that exist in only one instance. Implements default behaviour.

class SingletonBlob: public CodeBlob {
  friend class VMStructs;

 protected:
  void* operator new(size_t s, unsigned size) throw();

 public:
   SingletonBlob(
     const char* name,
     CodeBuffer* cb,
     int         header_size,
     int         size,
     int         frame_size,
     OopMapSet*  oop_maps
   )
   : CodeBlob(name, cb, header_size, size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
  {};

  address entry_point()                          { return code_begin(); }

  bool is_alive() const                          { return true; }

  void verify(); // does nothing
  void print_on(outputStream* st) const;
  void print_value_on(outputStream* st) const;
};


//----------------------------------------------------------------------------------------------------
// DeoptimizationBlob

class DeoptimizationBlob: public SingletonBlob {
  friend class VMStructs;
 private:
  int _unpack_offset;
  int _unpack_with_exception;
  int _unpack_with_reexecution;

  int _unpack_with_exception_in_tls;

  // Creation support
  DeoptimizationBlob(
    CodeBuffer* cb,
    int         size,
    OopMapSet*  oop_maps,
    int         unpack_offset,
    int         unpack_with_exception_offset,
    int         unpack_with_reexecution_offset,
    int         frame_size
  );

 public:
  // Creation
  static DeoptimizationBlob* create(
    CodeBuffer* cb,
    OopMapSet*  oop_maps,
    int         unpack_offset,
    int         unpack_with_exception_offset,
    int         unpack_with_reexecution_offset,
    int         frame_size
  );

  // Typing
  bool is_deoptimization_stub() const { return true; }
  bool exception_address_is_unpack_entry(address pc) const {
    address unpack_pc = unpack();
    return (pc == unpack_pc || (pc + frame::pc_return_offset) == unpack_pc);
  }




  // GC for args
  void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* Nothing to do */ }

  // Printing
  void print_value_on(outputStream* st) const;

  address unpack() const                         { return code_begin() + _unpack_offset;           }
  address unpack_with_exception() const          { return code_begin() + _unpack_with_exception;   }
  address unpack_with_reexecution() const        { return code_begin() + _unpack_with_reexecution; }

  // Alternate entry point for C1 where the exception and issuing pc
  // are in JavaThread::_exception_oop and JavaThread::_exception_pc
  // instead of being in registers.  This is needed because C1 doesn't
  // model exception paths in a way that keeps these registers free so
  // there may be live values in those registers during deopt.
  void set_unpack_with_exception_in_tls_offset(int offset) {
    _unpack_with_exception_in_tls = offset;
    assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
  }
  address unpack_with_exception_in_tls() const   { return code_begin() + _unpack_with_exception_in_tls; }
};


//----------------------------------------------------------------------------------------------------
// UncommonTrapBlob (currently only used by Compiler 2)

#ifdef COMPILER2

class UncommonTrapBlob: public SingletonBlob {
  friend class VMStructs;
 private:
  // Creation support
  UncommonTrapBlob(
    CodeBuffer* cb,
    int         size,
    OopMapSet*  oop_maps,
    int         frame_size
  );

 public:
  // Creation
  static UncommonTrapBlob* create(
    CodeBuffer* cb,
    OopMapSet*  oop_maps,
    int         frame_size
  );

  // GC for args
  void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f)  { /* nothing to do */ }

  // Typing
  bool is_uncommon_trap_stub() const             { return true; }
};


//----------------------------------------------------------------------------------------------------
// ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)

class ExceptionBlob: public SingletonBlob {
  friend class VMStructs;
 private:
  // Creation support
  ExceptionBlob(
    CodeBuffer* cb,
    int         size,
    OopMapSet*  oop_maps,
    int         frame_size
  );

 public:
  // Creation
  static ExceptionBlob* create(
    CodeBuffer* cb,
    OopMapSet*  oop_maps,
    int         frame_size
  );

  // GC for args
  void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f)  { /* nothing to do */ }

  // Typing
  bool is_exception_stub() const                 { return true; }
};
#endif // COMPILER2


//----------------------------------------------------------------------------------------------------
// SafepointBlob: handles illegal_instruction exceptions during a safepoint

class SafepointBlob: public SingletonBlob {
  friend class VMStructs;
 private:
  // Creation support
  SafepointBlob(
    CodeBuffer* cb,
    int         size,
    OopMapSet*  oop_maps,
    int         frame_size
  );

 public:
  // Creation
  static SafepointBlob* create(
    CodeBuffer* cb,
    OopMapSet*  oop_maps,
    int         frame_size
  );

  // GC for args
  void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f)  { /* nothing to do */ }

  // Typing
  bool is_safepoint_stub() const                 { return true; }
};

#endif // SHARE_VM_CODE_CODEBLOB_HPP

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