1 /*
   2  * Copyright (c) 1999, 2018, 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_nonstatic_concrete_methods;
  56   bool                   _is_unsafe_anonymous;
  57 
  58   ciFlags                _flags;
  59   jint                   _nonstatic_field_size;
  60   jint                   _nonstatic_oop_map_size;
  61 
  62   // Lazy fields get filled in only upon request.
  63   ciInstanceKlass*       _super;
  64   ciInstance*            _java_mirror;
  65 
  66   ciConstantPoolCache*   _field_cache;  // cached map index->field
  67   GrowableArray<ciField*>* _nonstatic_fields;
  68   int                    _has_injected_fields; // any non static injected fields? lazily initialized.
  69 
  70   // The possible values of the _implementor fall into following three cases:
  71   //   NULL: no implementor.
  72   //   A ciInstanceKlass that's not itself: one implementor.
  73   //   Itsef: more than one implementors.
  74   ciInstanceKlass*       _implementor;
  75 
  76   void compute_injected_fields();
  77   bool compute_injected_fields_helper();
  78 
  79 protected:
  80   ciInstanceKlass(Klass* k);
  81   ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain);
  82 
  83   InstanceKlass* get_instanceKlass() const {
  84     return InstanceKlass::cast(get_Klass());
  85   }
  86 
  87   oop loader();
  88   jobject loader_handle();
  89 
  90   oop protection_domain();
  91   jobject protection_domain_handle();
  92 
  93   const char* type_string() { return "ciInstanceKlass"; }
  94 
  95   bool is_in_package_impl(const char* packagename, int len);
  96 
  97   void print_impl(outputStream* st);
  98 
  99   ciConstantPoolCache* field_cache();
 100 
 101   bool is_shared() { return _is_shared; }
 102 
 103   void compute_shared_init_state();
 104   bool compute_shared_has_subklass();
 105   int  compute_nonstatic_fields();
 106   GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields);
 107 
 108   // Update the init_state for shared klasses
 109   void update_if_shared(InstanceKlass::ClassState expected) {
 110     if (_is_shared && _init_state != expected) {
 111       if (is_loaded()) compute_shared_init_state();
 112     }
 113   }
 114 
 115 public:
 116   // Has this klass been initialized?
 117   bool                   is_initialized() {
 118     update_if_shared(InstanceKlass::fully_initialized);
 119     return _init_state == InstanceKlass::fully_initialized;
 120   }
 121   // Is this klass being initialized?
 122   bool                   is_being_initialized() {
 123     update_if_shared(InstanceKlass::being_initialized);
 124     return _init_state == InstanceKlass::being_initialized;
 125   }
 126   // Has this klass been linked?
 127   bool                   is_linked() {
 128     update_if_shared(InstanceKlass::linked);
 129     return _init_state >= InstanceKlass::linked;
 130   }
 131 
 132   // General klass information.
 133   ciFlags                flags()          {
 134     assert(is_loaded(), "must be loaded");
 135     return _flags;
 136   }
 137   bool                   has_finalizer()  {
 138     assert(is_loaded(), "must be loaded");
 139     return _has_finalizer; }
 140   bool                   has_subklass()   {
 141     assert(is_loaded(), "must be loaded");
 142     if (_is_shared && !_has_subklass) {
 143       if (flags().is_final()) {
 144         return false;
 145       } else {
 146         return compute_shared_has_subklass();
 147       }
 148     }
 149     return _has_subklass;
 150   }
 151   jint                   size_helper()  {
 152     return (Klass::layout_helper_size_in_bytes(layout_helper())
 153             >> LogHeapWordSize);
 154   }
 155   jint                   nonstatic_field_size()  {
 156     assert(is_loaded(), "must be loaded");
 157     return _nonstatic_field_size; }
 158   jint                   has_nonstatic_fields()  {
 159     assert(is_loaded(), "must be loaded");
 160     return _has_nonstatic_fields; }
 161   jint                   nonstatic_oop_map_size()  {
 162     assert(is_loaded(), "must be loaded");
 163     return _nonstatic_oop_map_size; }
 164   ciInstanceKlass*       super();
 165   jint                   nof_implementors() {
 166     ciInstanceKlass* impl;
 167     assert(is_loaded(), "must be loaded");
 168     impl = implementor();
 169     if (impl == NULL) {
 170       return 0;
 171     } else if (impl != this) {
 172       return 1;
 173     } else {
 174       return 2;
 175     }
 176   }
 177   bool has_nonstatic_concrete_methods()  {
 178     assert(is_loaded(), "must be loaded");
 179     return _has_nonstatic_concrete_methods;
 180   }
 181 
 182   bool is_unsafe_anonymous() {
 183     return _is_unsafe_anonymous;
 184   }
 185 
 186   ciInstanceKlass* get_canonical_holder(int offset);
 187   ciField* get_field_by_offset(int field_offset, bool is_static);
 188   ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
 189 
 190   // total number of nonstatic fields (including inherited):
 191   int nof_nonstatic_fields() {
 192     if (_nonstatic_fields == NULL)
 193       return compute_nonstatic_fields();
 194     else
 195       return _nonstatic_fields->length();
 196   }
 197 
 198   bool has_injected_fields() {
 199     if (_has_injected_fields == -1) {
 200       compute_injected_fields();
 201     }
 202     return _has_injected_fields > 0 ? true : false;
 203   }
 204 
 205   bool has_object_fields() const;
 206 
 207   // nth nonstatic field (presented by ascending address)
 208   ciField* nonstatic_field_at(int i) {
 209     assert(_nonstatic_fields != NULL, "");
 210     return _nonstatic_fields->at(i);
 211   }
 212 
 213   ciInstanceKlass* unique_concrete_subklass();
 214   bool has_finalizable_subclass();
 215 
 216   bool contains_field_offset(int offset) {
 217     return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
 218   }
 219 
 220   // Get the instance of java.lang.Class corresponding to
 221   // this klass.  This instance is used for locking of
 222   // synchronized static methods of this klass.
 223   ciInstance*            java_mirror();
 224 
 225   // Java access flags
 226   bool is_public      () { return flags().is_public(); }
 227   bool is_final       () { return flags().is_final(); }
 228   bool is_super       () { return flags().is_super(); }
 229   bool is_interface   () { return flags().is_interface(); }
 230   bool is_abstract    () { return flags().is_abstract(); }
 231 
 232   ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
 233   // Note:  To find a method from name and type strings, use ciSymbol::make,
 234   // but consider adding to vmSymbols.hpp instead.
 235 
 236   bool is_leaf_type();
 237   ciInstanceKlass* implementor();
 238 
 239   // Is the defining class loader of this class the default loader?
 240   bool uses_default_loader() const;
 241 
 242   bool is_java_lang_Object() const;
 243 
 244   BasicType box_klass_type() const;
 245   bool is_box_klass() const;
 246   bool is_boxed_value_offset(int offset) const;
 247 
 248   // Is this klass in the given package?
 249   bool is_in_package(const char* packagename) {
 250     return is_in_package(packagename, (int) strlen(packagename));
 251   }
 252   bool is_in_package(const char* packagename, int len);
 253 
 254   // What kind of ciObject is this?
 255   bool is_instance_klass() const { return true; }
 256   bool is_java_klass() const     { return true; }
 257 
 258   virtual ciKlass* exact_klass() {
 259     if (is_loaded() && is_final() && !is_interface()) {
 260       return this;
 261     }
 262     return NULL;
 263   }
 264 
 265   ciInstanceKlass* unsafe_anonymous_host();
 266 
 267   bool can_be_instantiated() {
 268     assert(is_loaded(), "must be loaded");
 269     return !is_interface() && !is_abstract();
 270   }
 271 
 272   // Dump the current state of this klass for compilation replay.
 273   virtual void dump_replay_data(outputStream* out);
 274 };
 275 
 276 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP
--- EOF ---