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 /*

  * Copyright (c) 2005, 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_PRIMS_JVMTICLASSFILERECONSTITUTER_HPP

 #define SHARE_VM_PRIMS_JVMTICLASSFILERECONSTITUTER_HPP

 #include "jvmtifiles/jvmtiEnv.hpp"

 class JvmtiConstantPoolReconstituter : public StackObj {

  private:

   int                  _cpool_size;

   SymbolHashMap*       _symmap;

   SymbolHashMap*       _classmap;

   constantPoolHandle   _cpool;

   instanceKlassHandle  _ikh;

   jvmtiError           _err;

  protected:

   instanceKlassHandle  ikh()     { return _ikh; };

   constantPoolHandle   cpool()   { return _cpool; };

   u2 symbol_to_cpool_index(Symbol* sym) {

     return _symmap->symbol_to_value(sym);

   }

   u2 class_symbol_to_cpool_index(Symbol* sym) {

     return _classmap->symbol_to_value(sym);

   }

  public:

   // Calls to this constructor must be proceeded by a ResourceMark

   // and a HandleMark

   JvmtiConstantPoolReconstituter(instanceKlassHandle ikh){

     set_error(JVMTI_ERROR_NONE);

     _ikh = ikh;

     _cpool = constantPoolHandle(Thread::current(), ikh->constants());

     _symmap = new SymbolHashMap();

     _classmap = new SymbolHashMap();

     _cpool_size = _cpool->hash_entries_to(_symmap, _classmap);

     if (_cpool_size == 0) {

       set_error(JVMTI_ERROR_OUT_OF_MEMORY);

     } else if (_cpool_size < 0) {

       set_error(JVMTI_ERROR_INTERNAL);

     }

   }

   ~JvmtiConstantPoolReconstituter() {

     if (_symmap != NULL) {

       os::free(_symmap, mtClass);

       _symmap = NULL;

     }

     if (_classmap != NULL) {

       os::free(_classmap, mtClass);

       _classmap = NULL;

     }

   }

   void       set_error(jvmtiError err)    { _err = err; }

   jvmtiError get_error()                  { return _err; }

   int cpool_size()                        { return _cpool_size; }

   void copy_cpool_bytes(unsigned char *cpool_bytes) {

     if (cpool_bytes == NULL) {

       assert(cpool_bytes != NULL, "cpool_bytes pointer must not be NULL");

       return;

     }

     cpool()->copy_cpool_bytes(cpool_size(), _symmap, cpool_bytes);

   }

 };

 class JvmtiClassFileReconstituter : public JvmtiConstantPoolReconstituter {

  private:

   size_t               _buffer_size;

   u1*                  _buffer;

   u1*                  _buffer_ptr;

   Thread*              _thread;

   enum {

     // initial size should be power of two

     initial_buffer_size = 1024

   };

   inline Thread* thread() { return _thread; }

   void write_class_file_format();

   void write_field_infos();

   void write_method_infos();

   void write_method_info(methodHandle method);

   void write_code_attribute(methodHandle method);

   void write_exceptions_attribute(ConstMethod* const_method);

   void write_synthetic_attribute();

   void write_class_attributes();

   void write_source_file_attribute();

   void write_source_debug_extension_attribute();

   u2 line_number_table_entries(methodHandle method);

   void write_line_number_table_attribute(methodHandle method, u2 num_entries);

   void write_local_variable_table_attribute(methodHandle method, u2 num_entries);

   void write_local_variable_type_table_attribute(methodHandle method, u2 num_entries);

   void write_stackmap_table_attribute(methodHandle method, int stackmap_table_len);

   u2 inner_classes_attribute_length();

   void write_inner_classes_attribute(int length);

   void write_signature_attribute(u2 generic_signaure_index);

   void write_attribute_name_index(const char* name);

   void write_annotations_attribute(const char* attr_name, AnnotationArray* annos);

   void write_bootstrapmethod_attribute();

   address writeable_address(size_t size);

   void write_u1(u1 x);

   void write_u2(u2 x);

   void write_u4(u4 x);

   void write_u8(u8 x);

  public:

   // Calls to this constructor must be proceeded by a ResourceMark

   // and a HandleMark

   JvmtiClassFileReconstituter(instanceKlassHandle ikh) :

                                       JvmtiConstantPoolReconstituter(ikh) {

     _buffer_size = initial_buffer_size;

     _buffer = _buffer_ptr = NEW_RESOURCE_ARRAY(u1, _buffer_size);

     _thread = Thread::current();

     write_class_file_format();

   };

   size_t class_file_size()    { return _buffer_ptr - _buffer; }

   u1* class_file_bytes()      { return _buffer; }

   static void copy_bytecodes(methodHandle method, unsigned char* bytecodes);

 };

 #endif // SHARE_VM_PRIMS_JVMTICLASSFILERECONSTITUTER_HPP