jdk8-mips64-public/hotspot: src/share/vm/oops/klassVtable.hpp@624a0741915c (annotated)

src/share/vm/oops/klassVtable.hpp@624a0741915c (annotated)

src/share/vm/oops/klassVtable.hpp

Thu, 04 Apr 2019 17:56:29 +0800

author: aoqi
date: Thu, 04 Apr 2019 17:56:29 +0800
changeset 9572: 624a0741915c
parent 8604: 04d83ba48607
permissions: -rw-r--r--

Merge

 /*
  * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_OOPS_KLASSVTABLE_HPP
 #define SHARE_VM_OOPS_KLASSVTABLE_HPP
 #include "memory/allocation.hpp"
 #include "oops/oopsHierarchy.hpp"
 #include "runtime/handles.hpp"
 #include "utilities/growableArray.hpp"
 // A klassVtable abstracts the variable-length vtable that is embedded in InstanceKlass
 // and ArrayKlass.  klassVtable objects are used just as convenient transient accessors to the vtable,
 // not to actually hold the vtable data.
 // Note: the klassVtable should not be accessed before the class has been verified
 // (until that point, the vtable is uninitialized).
 // Currently a klassVtable contains a direct reference to the vtable data, and is therefore
 // not preserved across GCs.
 class vtableEntry;
 class klassVtable : public ResourceObj {
   KlassHandle  _klass;            // my klass
   int          _tableOffset;      // offset of start of vtable data within klass
   int          _length;           // length of vtable (number of entries)
 #ifndef PRODUCT
   int          _verify_count;     // to make verify faster
 #endif
   // Ordering important, so greater_than (>) can be used as an merge operator.
   enum AccessType {
     acc_private         = 0,
     acc_package_private = 1,
     acc_publicprotected = 2
   };
  public:
   klassVtable(KlassHandle h_klass, void* base, int length) : _klass(h_klass) {
     _tableOffset = (address)base - (address)h_klass(); _length = length;
   }
   // accessors
   vtableEntry* table() const      { return (vtableEntry*)(address(_klass()) + _tableOffset); }
   KlassHandle klass() const       { return _klass;  }
   int length() const              { return _length; }
   inline Method* method_at(int i) const;
   inline Method* unchecked_method_at(int i) const;
   inline Method** adr_method_at(int i) const;
   // searching; all methods return -1 if not found
   int index_of(Method* m) const                         { return index_of(m, _length); }
   int index_of_miranda(Symbol* name, Symbol* signature);
   void initialize_vtable(bool checkconstraints, TRAPS);   // initialize vtable of a new klass
   // CDS/RedefineClasses support - clear vtables so they can be reinitialized
   // at dump time.  Clearing gives us an easy way to tell if the vtable has
   // already been reinitialized at dump time (see dump.cpp).  Vtables can
   // be initialized at run time by RedefineClasses so dumping the right order
   // is necessary.
   void clear_vtable();
   bool is_initialized();
   // computes vtable length (in words) and the number of miranda methods
   static void compute_vtable_size_and_num_mirandas(
       int* vtable_length, int* num_new_mirandas,
       GrowableArray<Method*>* all_mirandas, Klass* super,
       Array<Method*>* methods, AccessFlags class_flags, Handle classloader,
       Symbol* classname, Array<Klass*>* local_interfaces, TRAPS);
 #if INCLUDE_JVMTI
   // RedefineClasses() API support:
   // If any entry of this vtable points to any of old_methods,
   // replace it with the corresponding new_method.
   // trace_name_printed is set to true if the current call has
   // printed the klass name so that other routines in the adjust_*
   // group don't print the klass name.
   bool adjust_default_method(int vtable_index, Method* old_method, Method* new_method);
   void adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed);
   bool check_no_old_or_obsolete_entries();
   void dump_vtable();
 #endif // INCLUDE_JVMTI
   // Debugging code
   void print()                                              PRODUCT_RETURN;
   void verify(outputStream* st, bool force = false);
   static void print_statistics()                            PRODUCT_RETURN;
  protected:
   friend class vtableEntry;
  private:
   enum { VTABLE_TRANSITIVE_OVERRIDE_VERSION = 51 } ;
   void copy_vtable_to(vtableEntry* start);
   int  initialize_from_super(KlassHandle super);
   int  index_of(Method* m, int len) const; // same as index_of, but search only up to len
   void put_method_at(Method* m, int index);
   static bool needs_new_vtable_entry(methodHandle m, Klass* super, Handle classloader, Symbol* classname, AccessFlags access_flags, TRAPS);
   bool update_inherited_vtable(InstanceKlass* klass, methodHandle target_method, int super_vtable_len, int default_index, bool checkconstraints, TRAPS);
  InstanceKlass* find_transitive_override(InstanceKlass* initialsuper, methodHandle target_method, int vtable_index,
                                          Handle target_loader, Symbol* target_classname, Thread* THREAD);
   // support for miranda methods
   bool is_miranda_entry_at(int i);
   int fill_in_mirandas(int initialized);
   static bool is_miranda(Method* m, Array<Method*>* class_methods,
                          Array<Method*>* default_methods, Klass* super);
   static void add_new_mirandas_to_lists(
       GrowableArray<Method*>* new_mirandas,
       GrowableArray<Method*>* all_mirandas,
       Array<Method*>* current_interface_methods,
       Array<Method*>* class_methods,
       Array<Method*>* default_methods,
       Klass* super);
   static void get_mirandas(
       GrowableArray<Method*>* new_mirandas,
       GrowableArray<Method*>* all_mirandas, Klass* super,
       Array<Method*>* class_methods,
       Array<Method*>* default_methods,
       Array<Klass*>* local_interfaces);
   void verify_against(outputStream* st, klassVtable* vt, int index);
   inline InstanceKlass* ik() const;
   // When loading a class from CDS archive at run time, and no class redefintion
   // has happened, it is expected that the class's itable/vtables are
   // laid out exactly the same way as they had been during dump time.
   // Therefore, in klassVtable::initialize_[iv]table, we do not layout the
   // tables again. Instead, we only rerun the process to create/check
   // the class loader constraints. In non-product builds, we add asserts to
   // guarantee that the table's layout would be the same as at dump time.
   //
   // If JVMTI redefines any class, the read-only shared memory are remapped
   // as read-write. A shared class' vtable/itable are re-initialized and
   // might have different layout due to class redefinition of the shared class
   // or its super types.
   bool is_preinitialized_vtable();
 };
 // private helper class for klassVtable
 // description of entry points:
 //    destination is interpreted:
 //      from_compiled_code_entry_point -> c2iadapter
 //      from_interpreter_entry_point   -> interpreter entry point
 //    destination is compiled:
 //      from_compiled_code_entry_point -> nmethod entry point
 //      from_interpreter_entry_point   -> i2cadapter
 class vtableEntry VALUE_OBJ_CLASS_SPEC {
   friend class VMStructs;
  public:
   // size in words
   static int size() {
     return sizeof(vtableEntry) / sizeof(HeapWord);
   }
   static int method_offset_in_bytes() { return offset_of(vtableEntry, _method); }
   Method* method() const    { return _method; }
  private:
   Method* _method;
   void set(Method* method)  { assert(method != NULL, "use clear"); _method = method; }
   void clear()                { _method = NULL; }
   void print()                                        PRODUCT_RETURN;
   void verify(klassVtable* vt, outputStream* st);
   friend class klassVtable;
 };
 inline Method* klassVtable::method_at(int i) const {
   assert(i >= 0 && i < _length, "index out of bounds");
   assert(table()[i].method() != NULL, "should not be null");
   assert(((Metadata*)table()[i].method())->is_method(), "should be method");
   return table()[i].method();
 }
 inline Method* klassVtable::unchecked_method_at(int i) const {
   assert(i >= 0 && i < _length, "index out of bounds");
   return table()[i].method();
 }
 inline Method** klassVtable::adr_method_at(int i) const {
   // Allow one past the last entry to be referenced; useful for loop bounds.
   assert(i >= 0 && i <= _length, "index out of bounds");
   return (Method**)(address(table() + i) + vtableEntry::method_offset_in_bytes());
 }
 // --------------------------------------------------------------------------------
 class klassItable;
 class itableMethodEntry;
 class itableOffsetEntry VALUE_OBJ_CLASS_SPEC {
  private:
   Klass* _interface;
   int      _offset;
  public:
   Klass* interface_klass() const { return _interface; }
   int      offset() const          { return _offset; }
   static itableMethodEntry* method_entry(Klass* k, int offset) { return (itableMethodEntry*)(((address)k) + offset); }
   itableMethodEntry* first_method_entry(Klass* k)              { return method_entry(k, _offset); }
   void initialize(Klass* interf, int offset) { _interface = interf; _offset = offset; }
   // Static size and offset accessors
   static int size()                       { return sizeof(itableOffsetEntry) / HeapWordSize; }    // size in words
   static int interface_offset_in_bytes()  { return offset_of(itableOffsetEntry, _interface); }
   static int offset_offset_in_bytes()     { return offset_of(itableOffsetEntry, _offset); }
   friend class klassItable;
 };
 class itableMethodEntry VALUE_OBJ_CLASS_SPEC {
  private:
   Method* _method;
  public:
   Method* method() const { return _method; }
   void clear()             { _method = NULL; }
   void initialize(Method* method);
   // Static size and offset accessors
   static int size()                         { return sizeof(itableMethodEntry) / HeapWordSize; }  // size in words
   static int method_offset_in_bytes()       { return offset_of(itableMethodEntry, _method); }
   friend class klassItable;
 };
 //
 // Format of an itable
 //
 //    ---- offset table ---
 //    Klass* of interface 1             \
 //    offset to vtable from start of oop  / offset table entry
 //    ...
 //    Klass* of interface n             \
 //    offset to vtable from start of oop  / offset table entry
 //    --- vtable for interface 1 ---
 //    Method*                             \
 //    compiler entry point                / method table entry
 //    ...
 //    Method*                             \
 //    compiler entry point                / method table entry
 //    -- vtable for interface 2 ---
 //    ...
 //
 class klassItable : public ResourceObj {
  private:
   instanceKlassHandle  _klass;             // my klass
   int                  _table_offset;      // offset of start of itable data within klass (in words)
   int                  _size_offset_table; // size of offset table (in itableOffset entries)
   int                  _size_method_table; // size of methodtable (in itableMethodEntry entries)
   void initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS);
  public:
   klassItable(instanceKlassHandle klass);
   itableOffsetEntry* offset_entry(int i) { assert(0 <= i && i <= _size_offset_table, "index out of bounds");
                                            return &((itableOffsetEntry*)vtable_start())[i]; }
   itableMethodEntry* method_entry(int i) { assert(0 <= i && i <= _size_method_table, "index out of bounds");
                                            return &((itableMethodEntry*)method_start())[i]; }
   int size_offset_table()                { return _size_offset_table; }
   // Initialization
   void initialize_itable(bool checkconstraints, TRAPS);
   // Updates
   void initialize_with_method(Method* m);
 #if INCLUDE_JVMTI
   // RedefineClasses() API support:
   // if any entry of this itable points to any of old_methods,
   // replace it with the corresponding new_method.
   // trace_name_printed is set to true if the current call has
   // printed the klass name so that other routines in the adjust_*
   // group don't print the klass name.
   void adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed);
   bool check_no_old_or_obsolete_entries();
   void dump_itable();
 #endif // INCLUDE_JVMTI
   // Setup of itable
   static int assign_itable_indices_for_interface(Klass* klass);
   static int method_count_for_interface(Klass* klass);
   static int compute_itable_size(Array<Klass*>* transitive_interfaces);
   static void setup_itable_offset_table(instanceKlassHandle klass);
   // Resolving of method to index
   static Method* method_for_itable_index(Klass* klass, int itable_index);
   // Debugging/Statistics
   static void print_statistics() PRODUCT_RETURN;
  private:
   intptr_t* vtable_start() const { return ((intptr_t*)_klass()) + _table_offset; }
   intptr_t* method_start() const { return vtable_start() + _size_offset_table * itableOffsetEntry::size(); }
   // Helper methods
   static int  calc_itable_size(int num_interfaces, int num_methods) { return (num_interfaces * itableOffsetEntry::size()) + (num_methods * itableMethodEntry::size()); }
   // Statistics
   NOT_PRODUCT(static int  _total_classes;)   // Total no. of classes with itables
   NOT_PRODUCT(static long _total_size;)      // Total no. of bytes used for itables
   static void update_stats(int size) PRODUCT_RETURN NOT_PRODUCT({ _total_classes++; _total_size += size; })
 };
 #endif // SHARE_VM_OOPS_KLASSVTABLE_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/klassVtable.hpp@624a0741915c (annotated)

src/share/vm/oops/klassVtable.hpp