1 /*
   2  * Copyright (c) 1999, 2012, 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 
  56   ciFlags                _flags;
  57   jint                   _nonstatic_field_size;
  58   jint                   _nonstatic_oop_map_size;
  59 
  60   // Lazy fields get filled in only upon request.
  61   ciInstanceKlass*       _super;
  62   ciInstance*            _java_mirror;
  63 
  64   ciConstantPoolCache*   _field_cache;  // cached map index->field
  65   GrowableArray<ciField*>* _nonstatic_fields;
  66 
  67   // The possible values of the _implementor fall into following three cases:
  68   //   NULL: no implementor.
  69   //   A ciInstanceKlass that's not itself: one implementor.
  70   //   Itsef: more than one implementors.
  71   ciInstanceKlass*       _implementor;
  72 
  73   GrowableArray<ciField*>* _non_static_fields;
  74 
  75 protected:
  76   ciInstanceKlass(KlassHandle h_k);
  77   ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain);
  78 
  79   InstanceKlass* get_instanceKlass() const {
  80     return (InstanceKlass*)get_Klass();
  81   }
  82 
  83   oop loader();
  84   jobject loader_handle();
  85 
  86   oop protection_domain();
  87   jobject protection_domain_handle();
  88 
  89   const char* type_string() { return "ciInstanceKlass"; }
  90 
  91   bool is_in_package_impl(const char* packagename, int len);
  92 
  93   void print_impl(outputStream* st);
  94 
  95   ciConstantPoolCache* field_cache();
  96 
  97   bool is_shared() { return _is_shared; }
  98 
  99   void compute_shared_init_state();
 100   bool compute_shared_has_subklass();
 101   int  compute_nonstatic_fields();
 102   GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields);
 103 
 104   // Update the init_state for shared klasses
 105   void update_if_shared(InstanceKlass::ClassState expected) {
 106     if (_is_shared && _init_state != expected) {
 107       if (is_loaded()) compute_shared_init_state();
 108     }
 109   }
 110 
 111 public:
 112   // Has this klass been initialized?
 113   bool                   is_initialized() {
 114     update_if_shared(InstanceKlass::fully_initialized);
 115     return _init_state == InstanceKlass::fully_initialized;
 116   }
 117   // Is this klass being initialized?
 118   bool                   is_being_initialized() {
 119     update_if_shared(InstanceKlass::being_initialized);
 120     return _init_state == InstanceKlass::being_initialized;
 121   }
 122   // Has this klass been linked?
 123   bool                   is_linked() {
 124     update_if_shared(InstanceKlass::linked);
 125     return _init_state >= InstanceKlass::linked;
 126   }
 127 
 128   // General klass information.
 129   ciFlags                flags()          {
 130     assert(is_loaded(), "must be loaded");
 131     return _flags;
 132   }
 133   bool                   has_finalizer()  {
 134     assert(is_loaded(), "must be loaded");
 135     return _has_finalizer; }
 136   bool                   has_subklass()   {
 137     assert(is_loaded(), "must be loaded");
 138     if (_is_shared && !_has_subklass) {
 139       if (flags().is_final()) {
 140         return false;
 141       } else {
 142         return compute_shared_has_subklass();
 143       }
 144     }
 145     return _has_subklass;
 146   }
 147   jint                   size_helper()  {
 148     return (Klass::layout_helper_size_in_bytes(layout_helper())
 149             >> LogHeapWordSize);
 150   }
 151   jint                   nonstatic_field_size()  {
 152     assert(is_loaded(), "must be loaded");
 153     return _nonstatic_field_size; }
 154   jint                   has_nonstatic_fields()  {
 155     assert(is_loaded(), "must be loaded");
 156     return _has_nonstatic_fields; }
 157   jint                   nonstatic_oop_map_size()  {
 158     assert(is_loaded(), "must be loaded");
 159     return _nonstatic_oop_map_size; }
 160   ciInstanceKlass*       super();
 161   jint                   nof_implementors() {
 162     ciInstanceKlass* impl;
 163     assert(is_loaded(), "must be loaded");
 164     impl = implementor();
 165     if (impl == NULL) {
 166       return 0;
 167     } else if (impl != this) {
 168       return 1;
 169     } else {
 170       return 2;
 171     }
 172   }
 173 
 174   ciInstanceKlass* get_canonical_holder(int offset);
 175   ciField* get_field_by_offset(int field_offset, bool is_static);
 176   ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
 177 
 178   GrowableArray<ciField*>* non_static_fields();
 179 
 180   // total number of nonstatic fields (including inherited):
 181   int nof_nonstatic_fields() {
 182     if (_nonstatic_fields == NULL)
 183       return compute_nonstatic_fields();
 184     else
 185       return _nonstatic_fields->length();
 186   }
 187   // nth nonstatic field (presented by ascending address)
 188   ciField* nonstatic_field_at(int i) {
 189     assert(_nonstatic_fields != NULL, "");
 190     return _nonstatic_fields->at(i);
 191   }
 192 
 193   ciInstanceKlass* unique_concrete_subklass();
 194   bool has_finalizable_subclass();
 195 
 196   bool contains_field_offset(int offset) {
 197     return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
 198   }
 199 
 200   // Get the instance of java.lang.Class corresponding to
 201   // this klass.  This instance is used for locking of
 202   // synchronized static methods of this klass.
 203   ciInstance*            java_mirror();
 204 
 205   // Java access flags
 206   bool is_public      () { return flags().is_public(); }
 207   bool is_final       () { return flags().is_final(); }
 208   bool is_super       () { return flags().is_super(); }
 209   bool is_interface   () { return flags().is_interface(); }
 210   bool is_abstract    () { return flags().is_abstract(); }
 211 
 212   ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
 213   // Note:  To find a method from name and type strings, use ciSymbol::make,
 214   // but consider adding to vmSymbols.hpp instead.
 215 
 216   bool is_leaf_type();
 217   ciInstanceKlass* implementor();
 218 
 219   // Is the defining class loader of this class the default loader?
 220   bool uses_default_loader() const;
 221 
 222   bool is_java_lang_Object() const;
 223 
 224   BasicType box_klass_type() const;
 225   bool is_box_klass() const;
 226   bool is_boxed_value_offset(int offset) const;
 227 
 228   // Is this klass in the given package?
 229   bool is_in_package(const char* packagename) {
 230     return is_in_package(packagename, (int) strlen(packagename));
 231   }
 232   bool is_in_package(const char* packagename, int len);
 233 
 234   // What kind of ciObject is this?
 235   bool is_instance_klass() const { return true; }
 236   bool is_java_klass() const     { return true; }
 237 
 238   // Dump the current state of this klass for compilation replay.
 239   virtual void dump_replay_data(outputStream* out);
 240 };
 241 
 242 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP