/*

 * 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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 */

#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 Types

// Used in the CodeCache to assign CodeBlobs to different CodeHeaps

struct CodeBlobType {

  enum {

    MethodNonProfiled   = 0,    // Execution level 1 and 4 (non-profiled) nmethods (including native nmethods)

    MethodProfiled      = 1,    // Execution level 2 and 3 (profiled) nmethods

    NonNMethod          = 2,    // Non-nmethods like Buffers, Adapters and Runtime Stubs

    All                 = 3,    // All types (No code cache segmentation)

    Pregenerated        = 4,    // Special blobs, managed by CodeCacheExtensions

    NumTypes            = 5     // Number of CodeBlobTypes

  };

};

// CodeBlob - superclass for all entries in the CodeCache.

//

//

//

// Layout:

//   - header

//   - relocation

//   - content space

//     - instruction space

//   - data space

class CodeBlob VALUE_OBJ_CLASS_SPEC {

  friend class VMStructs;

  friend class JVMCIVMStructs;

  friend class CodeCacheDumper;

  const char* _name;

  int        _size;                              // total size of CodeBlob in bytes

  int        _header_size;                       // size of header (depends on subclass)

  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

  ImmutableOopMapSet* _oop_maps;                 // OopMap for this CodeBlob

  // Returns the space needed for CodeBlob

  static unsigned int allocation_size(CodeBuffer* cb, int header_size);

  static unsigned int align_code_offset(int offset);

  // Deletion

  // Typing

  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; }

  virtual bool is_compiled_by_jvmci() const      { return false; }

  // Casting

  // Boundaries

  // 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();       }

  // Containment

  bool blob_contains(address addr) const         { return header_begin()       <= addr && addr < data_end();       }

  bool code_contains(address addr) const         { return code_begin()         <= addr && addr < code_end();       }

  // 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

  ImmutableOopMapSet* oop_maps() const           { return _oop_maps; }

  void set_oop_maps(OopMapSet* p);

  const ImmutableOopMap* oop_map_for_return_address(address return_address);

  // 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

  // Naming

  const char* name() const                       { return _name; }

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

  // Debugging

  virtual void print_on(outputStream* st) const;

  virtual void print_value_on(outputStream* st) const;

  void print_code();

  // 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);

  }

  static ByteSize name_field_offset() {

    return byte_offset_of(CodeBlob, _name);

  }

  static ByteSize oop_maps_field_offset() {

    return byte_offset_of(CodeBlob, _oop_maps);

  }

};

class WhiteBox;

//----------------------------------------------------------------------------------------------------

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

  friend class VMStructs;

  friend class AdapterBlob;

  friend class MethodHandlesAdapterBlob;

  friend class WhiteBox;

 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) 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

  friend class VMStructs;

 private:

  // 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/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.

  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

   )

  {};

  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;

  friend class JVMCIVMStructs;

 private:

  int _unpack_offset;

  int _unpack_with_exception;

  int _unpack_with_reexecution;

  int _unpack_with_exception_in_tls;

#if INCLUDE_JVMCI

  // Offsets when JVMCI calls uncommon_trap.

  int _uncommon_trap_offset;