1 /*
   2  * Copyright (c) 2005, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_PRIMS_JVMTICLASSFILERECONSTITUTER_HPP
  26 #define SHARE_VM_PRIMS_JVMTICLASSFILERECONSTITUTER_HPP
  27 
  28 #include "jvmtifiles/jvmtiEnv.hpp"
  29 
  30 
  31 class JvmtiConstantPoolReconstituter : public StackObj {
  32  private:
  33   int                  _cpool_size;
  34   SymbolHashMap*       _symmap;
  35   SymbolHashMap*       _classmap;
  36   constantPoolHandle   _cpool;
  37   InstanceKlass*       _ik;
  38   jvmtiError           _err;
  39 
  40  protected:
  41   InstanceKlass*  ik()           { return _ik; };
  42   constantPoolHandle   cpool()   { return _cpool; };
  43 
  44   u2 symbol_to_cpool_index(Symbol* sym) {
  45     return _symmap->symbol_to_value(sym);
  46   }
  47 
  48   u2 class_symbol_to_cpool_index(Symbol* sym) {
  49     return _classmap->symbol_to_value(sym);
  50   }
  51 
  52  public:
  53   // Calls to this constructor must be proceeded by a ResourceMark
  54   // and a HandleMark
  55   JvmtiConstantPoolReconstituter(InstanceKlass* ik){
  56     set_error(JVMTI_ERROR_NONE);
  57     _ik = ik;
  58     _cpool = constantPoolHandle(Thread::current(), ik->constants());
  59     _symmap = new SymbolHashMap();
  60     _classmap = new SymbolHashMap();
  61     _cpool_size = _cpool->hash_entries_to(_symmap, _classmap);
  62     if (_cpool_size == 0) {
  63       set_error(JVMTI_ERROR_OUT_OF_MEMORY);
  64     } else if (_cpool_size < 0) {
  65       set_error(JVMTI_ERROR_INTERNAL);
  66     }
  67   }
  68 
  69   ~JvmtiConstantPoolReconstituter() {
  70     if (_symmap != NULL) {
  71       delete _symmap;
  72       _symmap = NULL;
  73     }
  74     if (_classmap != NULL) {
  75       delete _classmap;
  76       _classmap = NULL;
  77     }
  78   }
  79 
  80 
  81   void       set_error(jvmtiError err)    { _err = err; }
  82   jvmtiError get_error()                  { return _err; }
  83 
  84   int cpool_size()                        { return _cpool_size; }
  85 
  86   void copy_cpool_bytes(unsigned char *cpool_bytes) {
  87     if (cpool_bytes == NULL) {
  88       assert(cpool_bytes != NULL, "cpool_bytes pointer must not be NULL");
  89       return;
  90     }
  91     cpool()->copy_cpool_bytes(cpool_size(), _symmap, cpool_bytes);
  92   }
  93 };
  94 
  95 
  96 class JvmtiClassFileReconstituter : public JvmtiConstantPoolReconstituter {
  97  private:
  98   size_t               _buffer_size;
  99   u1*                  _buffer;
 100   u1*                  _buffer_ptr;
 101   Thread*              _thread;
 102 
 103   enum {
 104     // initial size should be power of two
 105     initial_buffer_size = 1024
 106   };
 107 
 108   inline Thread* thread() { return _thread; }
 109 
 110   void write_class_file_format();
 111   void write_field_infos();
 112   void write_method_infos();
 113   void write_method_info(const methodHandle& method);
 114   void write_code_attribute(const methodHandle& method);
 115   void write_exceptions_attribute(ConstMethod* const_method);
 116   void write_synthetic_attribute();
 117   void write_class_attributes();
 118   void write_source_file_attribute();
 119   void write_source_debug_extension_attribute();
 120   u2 line_number_table_entries(const methodHandle& method);
 121   void write_line_number_table_attribute(const methodHandle& method, u2 num_entries);
 122   void write_local_variable_table_attribute(const methodHandle& method, u2 num_entries);
 123   void write_local_variable_type_table_attribute(const methodHandle& method, u2 num_entries);
 124   void write_stackmap_table_attribute(const methodHandle& method, int stackmap_table_len);
 125   u2 inner_classes_attribute_length();
 126   void write_inner_classes_attribute(int length);
 127   void write_signature_attribute(u2 generic_signaure_index);
 128   void write_attribute_name_index(const char* name);
 129   void write_annotations_attribute(const char* attr_name, AnnotationArray* annos);
 130   void write_bootstrapmethod_attribute();
 131 
 132   address writeable_address(size_t size);
 133   void write_u1(u1 x);
 134   void write_u2(u2 x);
 135   void write_u4(u4 x);
 136   void write_u8(u8 x);
 137 
 138  public:
 139   // Calls to this constructor must be proceeded by a ResourceMark
 140   // and a HandleMark
 141   JvmtiClassFileReconstituter(InstanceKlass* ik) :
 142                                       JvmtiConstantPoolReconstituter(ik) {
 143     _buffer_size = initial_buffer_size;
 144     _buffer = _buffer_ptr = NEW_RESOURCE_ARRAY(u1, _buffer_size);
 145     _thread = Thread::current();
 146     write_class_file_format();
 147   };
 148 
 149   size_t class_file_size()    { return _buffer_ptr - _buffer; }
 150 
 151   u1* class_file_bytes()      { return _buffer; }
 152 
 153   static void copy_bytecodes(const methodHandle& method, unsigned char* bytecodes);
 154 };
 155 
 156 #endif // SHARE_VM_PRIMS_JVMTICLASSFILERECONSTITUTER_HPP
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