1 /*
   2  * Copyright (c) 1999, 2016, 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   bool                   _is_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 
  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   GrowableArray<ciField*>* _non_static_fields;
  76 
  77 protected:
  78   ciInstanceKlass(KlassHandle h_k);
  79   ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain);
  80 
  81   InstanceKlass* get_instanceKlass() const {
  82     return (InstanceKlass*)get_Klass();
  83   }
  84 
  85   oop loader();
  86   jobject loader_handle();
  87 
  88   oop protection_domain();
  89   jobject protection_domain_handle();
  90 
  91   const char* type_string() { return "ciInstanceKlass"; }
  92 
  93   bool is_in_package_impl(const char* packagename, int len);
  94 
  95   void print_impl(outputStream* st);
  96 
  97   ciConstantPoolCache* field_cache();
  98 
  99   bool is_shared() { return _is_shared; }
 100 
 101   void compute_shared_init_state();
 102   bool compute_shared_has_subklass();
 103   int  compute_nonstatic_fields();
 104   GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields);
 105 
 106   // Update the init_state for shared klasses
 107   void update_if_shared(InstanceKlass::ClassState expected) {
 108     if (_is_shared && _init_state != expected) {
 109       if (is_loaded()) compute_shared_init_state();
 110     }
 111   }
 112 
 113 public:
 114   // Has this klass been initialized?
 115   bool                   is_initialized() {
 116     update_if_shared(InstanceKlass::fully_initialized);
 117     return _init_state == InstanceKlass::fully_initialized;
 118   }
 119   // Is this klass being initialized?
 120   bool                   is_being_initialized() {
 121     update_if_shared(InstanceKlass::being_initialized);
 122     return _init_state == InstanceKlass::being_initialized;
 123   }
 124   // Has this klass been linked?
 125   bool                   is_linked() {
 126     update_if_shared(InstanceKlass::linked);
 127     return _init_state >= InstanceKlass::linked;
 128   }
 129 
 130   // General klass information.
 131   ciFlags                flags()          {
 132     assert(is_loaded(), "must be loaded");
 133     return _flags;
 134   }
 135   bool                   has_finalizer()  {
 136     assert(is_loaded(), "must be loaded");
 137     return _has_finalizer; }
 138   bool                   has_subklass()   {
 139     assert(is_loaded(), "must be loaded");
 140     if (_is_shared && !_has_subklass) {
 141       if (flags().is_final()) {
 142         return false;
 143       } else {
 144         return compute_shared_has_subklass();
 145       }
 146     }
 147     return _has_subklass;
 148   }
 149   jint                   size_helper()  {
 150     return (Klass::layout_helper_size_in_bytes(layout_helper())
 151             >> LogHeapWordSize);
 152   }
 153   jint                   nonstatic_field_size()  {
 154     assert(is_loaded(), "must be loaded");
 155     return _nonstatic_field_size; }
 156   jint                   has_nonstatic_fields()  {
 157     assert(is_loaded(), "must be loaded");
 158     return _has_nonstatic_fields; }
 159   jint                   nonstatic_oop_map_size()  {
 160     assert(is_loaded(), "must be loaded");
 161     return _nonstatic_oop_map_size; }
 162   ciInstanceKlass*       super();
 163   jint                   nof_implementors() {
 164     ciInstanceKlass* impl;
 165     assert(is_loaded(), "must be loaded");
 166     impl = implementor();
 167     if (impl == NULL) {
 168       return 0;
 169     } else if (impl != this) {
 170       return 1;
 171     } else {
 172       return 2;
 173     }
 174   }
 175 
 176   bool has_default_methods()  {
 177     assert(is_loaded(), "must be loaded");
 178     return _has_default_methods;
 179   }
 180 
 181   bool is_anonymous() {
 182     return _is_anonymous;
 183   }
 184 
 185   ciInstanceKlass* get_canonical_holder(int offset);
 186   ciField* get_field_by_offset(int field_offset, bool is_static);
 187   ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
 188 
 189   GrowableArray<ciField*>* non_static_fields();
 190 
 191   // total number of nonstatic fields (including inherited):
 192   int nof_nonstatic_fields() {
 193     if (_nonstatic_fields == NULL)
 194       return compute_nonstatic_fields();
 195     else
 196       return _nonstatic_fields->length();
 197   }
 198   // nth nonstatic field (presented by ascending address)
 199   ciField* nonstatic_field_at(int i) {
 200     assert(_nonstatic_fields != NULL, "");
 201     return _nonstatic_fields->at(i);
 202   }
 203 
 204   ciInstanceKlass* unique_concrete_subklass();
 205   bool has_finalizable_subclass();
 206 
 207   bool contains_field_offset(int offset) {
 208     return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
 209   }
 210 
 211   // Get the instance of java.lang.Class corresponding to
 212   // this klass.  This instance is used for locking of
 213   // synchronized static methods of this klass.
 214   ciInstance*            java_mirror();
 215 
 216   // Java access flags
 217   bool is_public      () { return flags().is_public(); }
 218   bool is_final       () { return flags().is_final(); }
 219   bool is_super       () { return flags().is_super(); }
 220   bool is_interface   () { return flags().is_interface(); }
 221   bool is_abstract    () { return flags().is_abstract(); }
 222 
 223   ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
 224   // Note:  To find a method from name and type strings, use ciSymbol::make,
 225   // but consider adding to vmSymbols.hpp instead.
 226 
 227   bool is_leaf_type();
 228   ciInstanceKlass* implementor();
 229 
 230   // Is the defining class loader of this class the default loader?
 231   bool uses_default_loader() const;
 232 
 233   bool is_java_lang_Object() const;
 234 
 235   BasicType box_klass_type() const;
 236   bool is_box_klass() const;
 237   bool is_boxed_value_offset(int offset) const;
 238 
 239   // Is this klass in the given package?
 240   bool is_in_package(const char* packagename) {
 241     return is_in_package(packagename, (int) strlen(packagename));
 242   }
 243   bool is_in_package(const char* packagename, int len);
 244 
 245   // What kind of ciObject is this?
 246   bool is_instance_klass() const { return true; }
 247   bool is_java_klass() const     { return true; }
 248 
 249   virtual ciKlass* exact_klass() {
 250     if (is_loaded() && is_final() && !is_interface()) {
 251       return this;
 252     }
 253     return NULL;
 254   }
 255 
 256   ciInstanceKlass* host_klass();
 257 
 258   // Dump the current state of this klass for compilation replay.
 259   virtual void dump_replay_data(outputStream* out);
 260 };
 261 
 262 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP