1 /*
   2  * Copyright (c) 1999, 2013, 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_CI_CIINSTANCEKLASS_HPP
  26 #define SHARE_VM_CI_CIINSTANCEKLASS_HPP
  27 
  28 #include "ci/ciConstantPoolCache.hpp"
  29 #include "ci/ciFlags.hpp"
  30 #include "ci/ciKlass.hpp"
  31 #include "ci/ciSymbol.hpp"
  32 
  33 // ciInstanceKlass
  34 //
  35 // This class represents a Klass* in the HotSpot virtual machine
  36 // whose Klass part is an InstanceKlass.  It may or may not
  37 // be loaded.
  38 class ciInstanceKlass : public ciKlass {
  39   CI_PACKAGE_ACCESS
  40   friend class ciBytecodeStream;
  41   friend class ciEnv;
  42   friend class ciExceptionHandler;
  43   friend class ciMethod;
  44   friend class ciField;
  45 
  46 private:
  47   jobject                _loader;
  48   jobject                _protection_domain;
  49 
  50   InstanceKlass::ClassState _init_state;           // state of class
  51   bool                   _is_shared;
  52   bool                   _has_finalizer;
  53   bool                   _has_subklass;
  54   bool                   _has_nonstatic_fields;
  55   bool                   _has_default_methods;

  56 
  57   ciFlags                _flags;
  58   jint                   _nonstatic_field_size;
  59   jint                   _nonstatic_oop_map_size;
  60 
  61   // Lazy fields get filled in only upon request.
  62   ciInstanceKlass*       _super;
  63   ciInstance*            _java_mirror;
  64 
  65   ciConstantPoolCache*   _field_cache;  // cached map index->field
  66   GrowableArray<ciField*>* _nonstatic_fields;
  67   int                    _has_injected_fields; // any non static injected fields? lazily initialized.
  68 
  69   // The possible values of the _implementor fall into following three cases:
  70   //   NULL: no implementor.
  71   //   A ciInstanceKlass that's not itself: one implementor.
  72   //   Itsef: more than one implementors.
  73   ciInstanceKlass*       _implementor;
  74 
  75   void compute_injected_fields();
  76   bool compute_injected_fields_helper();
  77 
  78 protected:
  79   ciInstanceKlass(KlassHandle h_k);
  80   ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain);
  81 
  82   InstanceKlass* get_instanceKlass() const {
  83     return (InstanceKlass*)get_Klass();
  84   }
  85 
  86   oop loader();
  87   jobject loader_handle();
  88 
  89   oop protection_domain();
  90   jobject protection_domain_handle();
  91 
  92   const char* type_string() { return "ciInstanceKlass"; }
  93 
  94   bool is_in_package_impl(const char* packagename, int len);
  95 
  96   void print_impl(outputStream* st);
  97 
  98   ciConstantPoolCache* field_cache();
  99 
 100   bool is_shared() { return _is_shared; }
 101 
 102   void compute_shared_init_state();
 103   bool compute_shared_has_subklass();
 104   int  compute_nonstatic_fields();
 105   GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields);
 106 
 107   // Update the init_state for shared klasses
 108   void update_if_shared(InstanceKlass::ClassState expected) {
 109     if (_is_shared && _init_state != expected) {
 110       if (is_loaded()) compute_shared_init_state();
 111     }
 112   }
 113 
 114 public:
 115   // Has this klass been initialized?
 116   bool                   is_initialized() {
 117     update_if_shared(InstanceKlass::fully_initialized);
 118     return _init_state == InstanceKlass::fully_initialized;
 119   }
 120   // Is this klass being initialized?
 121   bool                   is_being_initialized() {
 122     update_if_shared(InstanceKlass::being_initialized);
 123     return _init_state == InstanceKlass::being_initialized;
 124   }
 125   // Has this klass been linked?
 126   bool                   is_linked() {
 127     update_if_shared(InstanceKlass::linked);
 128     return _init_state >= InstanceKlass::linked;
 129   }
 130 
 131   // General klass information.
 132   ciFlags                flags()          {
 133     assert(is_loaded(), "must be loaded");
 134     return _flags;
 135   }
 136   bool                   has_finalizer()  {
 137     assert(is_loaded(), "must be loaded");
 138     return _has_finalizer; }
 139   bool                   has_subklass()   {
 140     assert(is_loaded(), "must be loaded");
 141     if (_is_shared && !_has_subklass) {
 142       if (flags().is_final()) {
 143         return false;
 144       } else {
 145         return compute_shared_has_subklass();
 146       }
 147     }
 148     return _has_subklass;
 149   }
 150   jint                   size_helper()  {
 151     return (Klass::layout_helper_size_in_bytes(layout_helper())
 152             >> LogHeapWordSize);
 153   }
 154   jint                   nonstatic_field_size()  {
 155     assert(is_loaded(), "must be loaded");
 156     return _nonstatic_field_size; }
 157   jint                   has_nonstatic_fields()  {
 158     assert(is_loaded(), "must be loaded");
 159     return _has_nonstatic_fields; }
 160   jint                   nonstatic_oop_map_size()  {
 161     assert(is_loaded(), "must be loaded");
 162     return _nonstatic_oop_map_size; }
 163   ciInstanceKlass*       super();
 164   jint                   nof_implementors() {
 165     ciInstanceKlass* impl;
 166     assert(is_loaded(), "must be loaded");
 167     impl = implementor();
 168     if (impl == NULL) {
 169       return 0;
 170     } else if (impl != this) {
 171       return 1;
 172     } else {
 173       return 2;
 174     }
 175   }
 176 
 177   bool has_default_methods()  {
 178     assert(is_loaded(), "must be loaded");
 179     return _has_default_methods;
 180   }
 181 




 182   ciInstanceKlass* get_canonical_holder(int offset);
 183   ciField* get_field_by_offset(int field_offset, bool is_static);
 184   ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
 185 
 186   // total number of nonstatic fields (including inherited):
 187   int nof_nonstatic_fields() {
 188     if (_nonstatic_fields == NULL)
 189       return compute_nonstatic_fields();
 190     else
 191       return _nonstatic_fields->length();
 192   }
 193 
 194   bool has_injected_fields() {
 195     if (_has_injected_fields == -1) {
 196       compute_injected_fields();
 197     }
 198     return _has_injected_fields > 0 ? true : false;
 199   }
 200 
 201   // nth nonstatic field (presented by ascending address)
 202   ciField* nonstatic_field_at(int i) {
 203     assert(_nonstatic_fields != NULL, "");
 204     return _nonstatic_fields->at(i);
 205   }
 206 
 207   ciInstanceKlass* unique_concrete_subklass();
 208   bool has_finalizable_subclass();
 209 
 210   bool contains_field_offset(int offset) {
 211     return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
 212   }
 213 
 214   // Get the instance of java.lang.Class corresponding to
 215   // this klass.  This instance is used for locking of
 216   // synchronized static methods of this klass.
 217   ciInstance*            java_mirror();
 218 
 219   // Java access flags
 220   bool is_public      () { return flags().is_public(); }
 221   bool is_final       () { return flags().is_final(); }
 222   bool is_super       () { return flags().is_super(); }
 223   bool is_interface   () { return flags().is_interface(); }
 224   bool is_abstract    () { return flags().is_abstract(); }
 225 
 226   ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
 227   // Note:  To find a method from name and type strings, use ciSymbol::make,
 228   // but consider adding to vmSymbols.hpp instead.
 229 
 230   bool is_leaf_type();
 231   ciInstanceKlass* implementor();
 232 
 233   // Is the defining class loader of this class the default loader?
 234   bool uses_default_loader() const;
 235 
 236   bool is_java_lang_Object() const;
 237 
 238   BasicType box_klass_type() const;
 239   bool is_box_klass() const;
 240   bool is_boxed_value_offset(int offset) const;
 241 
 242   // Is this klass in the given package?
 243   bool is_in_package(const char* packagename) {
 244     return is_in_package(packagename, (int) strlen(packagename));
 245   }
 246   bool is_in_package(const char* packagename, int len);
 247 
 248   // What kind of ciObject is this?
 249   bool is_instance_klass() const { return true; }
 250   bool is_java_klass() const     { return true; }
 251 
 252   virtual ciKlass* exact_klass() {
 253     if (is_loaded() && is_final() && !is_interface()) {
 254       return this;
 255     }
 256     return NULL;
 257   }
 258 
 259   // Dump the current state of this klass for compilation replay.
 260   virtual void dump_replay_data(outputStream* out);
 261 };
 262 
 263 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP
--- EOF ---