src/hotspot/share/prims/jvmtiClassFileReconstituter.hpp
author naoto
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/*
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 * Copyright (c) 2005, 2019, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_PRIMS_JVMTICLASSFILERECONSTITUTER_HPP
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#define SHARE_PRIMS_JVMTICLASSFILERECONSTITUTER_HPP
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#include "jvmtifiles/jvmtiEnv.hpp"
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class JvmtiConstantPoolReconstituter : public StackObj {
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 private:
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  int                  _cpool_size;
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  SymbolHashMap*       _symmap;
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  SymbolHashMap*       _classmap;
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  constantPoolHandle   _cpool;
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  InstanceKlass*       _ik;
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  jvmtiError           _err;
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 protected:
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  InstanceKlass*  ik()           { return _ik; };
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  constantPoolHandle   cpool()   { return _cpool; };
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  u2 symbol_to_cpool_index(Symbol* sym) {
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    return _symmap->symbol_to_value(sym);
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  }
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  u2 class_symbol_to_cpool_index(Symbol* sym) {
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    return _classmap->symbol_to_value(sym);
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  }
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 public:
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  // Calls to this constructor must be proceeded by a ResourceMark
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  // and a HandleMark
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  JvmtiConstantPoolReconstituter(InstanceKlass* ik);
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  ~JvmtiConstantPoolReconstituter() {
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    if (_symmap != NULL) {
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      delete _symmap;
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      _symmap = NULL;
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    }
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    if (_classmap != NULL) {
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      delete _classmap;
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      _classmap = NULL;
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    }
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  }
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  void       set_error(jvmtiError err)    { _err = err; }
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  jvmtiError get_error()                  { return _err; }
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  int cpool_size()                        { return _cpool_size; }
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  void copy_cpool_bytes(unsigned char *cpool_bytes) {
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    if (cpool_bytes == NULL) {
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      assert(cpool_bytes != NULL, "cpool_bytes pointer must not be NULL");
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      return;
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    }
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    cpool()->copy_cpool_bytes(cpool_size(), _symmap, cpool_bytes);
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  }
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};
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class JvmtiClassFileReconstituter : public JvmtiConstantPoolReconstituter {
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 private:
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  size_t               _buffer_size;
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  u1*                  _buffer;
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  u1*                  _buffer_ptr;
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  Thread*              _thread;
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  enum {
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    // initial size should be power of two
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    initial_buffer_size = 1024
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  };
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  inline Thread* thread() { return _thread; }
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  void write_class_file_format();
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  void write_field_infos();
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  void write_method_infos();
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  void write_method_info(const methodHandle& method);
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  void write_code_attribute(const methodHandle& method);
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  void write_exceptions_attribute(ConstMethod* const_method);
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  void write_synthetic_attribute();
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  void write_class_attributes();
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  void write_source_file_attribute();
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  void write_source_debug_extension_attribute();
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  u2 line_number_table_entries(const methodHandle& method);
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  void write_line_number_table_attribute(const methodHandle& method, u2 num_entries);
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  void write_local_variable_table_attribute(const methodHandle& method, u2 num_entries);
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  void write_local_variable_type_table_attribute(const methodHandle& method, u2 num_entries);
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  void write_stackmap_table_attribute(const methodHandle& method, int stackmap_table_len);
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  u2 inner_classes_attribute_length();
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  void write_inner_classes_attribute(int length);
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  void write_signature_attribute(u2 generic_signaure_index);
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  void write_attribute_name_index(const char* name);
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  void write_annotations_attribute(const char* attr_name, AnnotationArray* annos);
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  void write_bootstrapmethod_attribute();
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  void write_nest_host_attribute();
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  void write_nest_members_attribute();
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  address writeable_address(size_t size);
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  void write_u1(u1 x);
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  void write_u2(u2 x);
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  void write_u4(u4 x);
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  void write_u8(u8 x);
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 public:
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  // Calls to this constructor must be proceeded by a ResourceMark
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  // and a HandleMark
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  JvmtiClassFileReconstituter(InstanceKlass* ik) :
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                                      JvmtiConstantPoolReconstituter(ik) {
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    _buffer_size = initial_buffer_size;
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    _buffer = _buffer_ptr = NEW_RESOURCE_ARRAY(u1, _buffer_size);
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    _thread = Thread::current();
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    write_class_file_format();
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  };
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  size_t class_file_size()    { return _buffer_ptr - _buffer; }
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  u1* class_file_bytes()      { return _buffer; }
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  static void copy_bytecodes(const methodHandle& method, unsigned char* bytecodes);
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};
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#endif // SHARE_PRIMS_JVMTICLASSFILERECONSTITUTER_HPP