jdk8-mips64-public/hotspot: src/share/vm/oops/cpCacheOop.cpp@a61af66fc99e (annotated)

src/share/vm/oops/cpCacheOop.cpp@a61af66fc99e (annotated)

src/share/vm/oops/cpCacheOop.cpp

Sat, 01 Dec 2007 00:00:00 +0000

author: duke
date: Sat, 01 Dec 2007 00:00:00 +0000
changeset 435: a61af66fc99e
child 548: ba764ed4b6f2
permissions: -rw-r--r--

Initial load

 /*
  * Copyright 1998-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 #include "incls/_precompiled.incl"
 #include "incls/_cpCacheOop.cpp.incl"
 // Implememtation of ConstantPoolCacheEntry
 void ConstantPoolCacheEntry::set_initial_state(int index) {
   assert(0 <= index && index < 0x10000, "sanity check");
   _indices = index;
 }
 int ConstantPoolCacheEntry::as_flags(TosState state, bool is_final,
                     bool is_vfinal, bool is_volatile,
                     bool is_method_interface, bool is_method) {
   int f = state;
   assert( state < number_of_states, "Invalid state in as_flags");
   f <<= 1;
   if (is_final) f |= 1;
   f <<= 1;
   if (is_vfinal) f |= 1;
   f <<= 1;
   if (is_volatile) f |= 1;
   f <<= 1;
   if (is_method_interface) f |= 1;
   f <<= 1;
   if (is_method) f |= 1;
   f <<= ConstantPoolCacheEntry::hotSwapBit;
   // Preserve existing flag bit values
 #ifdef ASSERT
   int old_state = ((_flags >> tosBits) & 0x0F);
   assert(old_state == 0 || old_state == state,
          "inconsistent cpCache flags state");
 #endif
   return (_flags | f) ;
 }
 void ConstantPoolCacheEntry::set_bytecode_1(Bytecodes::Code code) {
 #ifdef ASSERT
   // Read once.
   volatile Bytecodes::Code c = bytecode_1();
   assert(c == 0 || c == code || code == 0, "update must be consistent");
 #endif
   // Need to flush pending stores here before bytecode is written.
   OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << 16));
 }
 void ConstantPoolCacheEntry::set_bytecode_2(Bytecodes::Code code) {
 #ifdef ASSERT
   // Read once.
   volatile Bytecodes::Code c = bytecode_2();
   assert(c == 0 || c == code || code == 0, "update must be consistent");
 #endif
   // Need to flush pending stores here before bytecode is written.
   OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << 24));
 }
 #ifdef ASSERT
 // It is possible to have two different dummy methodOops created
 // when the resolve code for invoke interface executes concurrently
 // Hence the assertion below is weakened a bit for the invokeinterface
 // case.
 bool ConstantPoolCacheEntry::same_methodOop(oop cur_f1, oop f1) {
   return (cur_f1 == f1 || ((methodOop)cur_f1)->name() ==
          ((methodOop)f1)->name() || ((methodOop)cur_f1)->signature() ==
          ((methodOop)f1)->signature());
 }
 #endif
 // Note that concurrent update of both bytecodes can leave one of them
 // reset to zero.  This is harmless; the interpreter will simply re-resolve
 // the damaged entry.  More seriously, the memory synchronization is needed
 // to flush other fields (f1, f2) completely to memory before the bytecodes
 // are updated, lest other processors see a non-zero bytecode but zero f1/f2.
 void ConstantPoolCacheEntry::set_field(Bytecodes::Code get_code,
                                        Bytecodes::Code put_code,
                                        KlassHandle field_holder,
                                        int orig_field_index,
                                        int field_offset,
                                        TosState field_type,
                                        bool is_final,
                                        bool is_volatile) {
   set_f1(field_holder());
   set_f2(field_offset);
   // The field index is used by jvm/ti and is the index into fields() array
   // in holder instanceKlass.  This is scaled by instanceKlass::next_offset.
   assert((orig_field_index % instanceKlass::next_offset) == 0, "wierd index");
   const int field_index = orig_field_index / instanceKlass::next_offset;
   assert(field_index <= field_index_mask,
          "field index does not fit in low flag bits");
   set_flags(as_flags(field_type, is_final, false, is_volatile, false, false) |
             (field_index & field_index_mask));
   set_bytecode_1(get_code);
   set_bytecode_2(put_code);
   NOT_PRODUCT(verify(tty));
 }
 int  ConstantPoolCacheEntry::field_index() const {
   return (_flags & field_index_mask) * instanceKlass::next_offset;
 }
 void ConstantPoolCacheEntry::set_method(Bytecodes::Code invoke_code,
                                         methodHandle method,
                                         int vtable_index) {
   assert(method->interpreter_entry() != NULL, "should have been set at this point");
   assert(!method->is_obsolete(),  "attempt to write obsolete method to cpCache");
   bool change_to_virtual = (invoke_code == Bytecodes::_invokeinterface);
   int byte_no = -1;
   bool needs_vfinal_flag = false;
   switch (invoke_code) {
     case Bytecodes::_invokevirtual:
     case Bytecodes::_invokeinterface: {
         if (method->can_be_statically_bound()) {
           set_f2((intptr_t)method());
           needs_vfinal_flag = true;
         } else {
           assert(vtable_index >= 0, "valid index");
           set_f2(vtable_index);
         }
         byte_no = 2;
         break;
     }
     case Bytecodes::_invokespecial:
       // Preserve the value of the vfinal flag on invokevirtual bytecode
       // which may be shared with this constant pool cache entry.
       needs_vfinal_flag = is_resolved(Bytecodes::_invokevirtual) && is_vfinal();
       // fall through
     case Bytecodes::_invokestatic:
       set_f1(method());
       byte_no = 1;
       break;
     default:
       ShouldNotReachHere();
       break;
   }
   set_flags(as_flags(as_TosState(method->result_type()),
                      method->is_final_method(),
                      needs_vfinal_flag,
                      false,
                      change_to_virtual,
                      true)|
             method()->size_of_parameters());
   // Note:  byte_no also appears in TemplateTable::resolve.
   if (byte_no == 1) {
     set_bytecode_1(invoke_code);
   } else if (byte_no == 2)  {
     if (change_to_virtual) {
       // NOTE: THIS IS A HACK - BE VERY CAREFUL!!!
       //
       // Workaround for the case where we encounter an invokeinterface, but we
       // should really have an _invokevirtual since the resolved method is a
       // virtual method in java.lang.Object. This is a corner case in the spec
       // but is presumably legal. javac does not generate this code.
       //
       // We set bytecode_1() to _invokeinterface, because that is the
       // bytecode # used by the interpreter to see if it is resolved.
       // We set bytecode_2() to _invokevirtual.
       // See also interpreterRuntime.cpp. (8/25/2000)
       // Only set resolved for the invokeinterface case if method is public.
       // Otherwise, the method needs to be reresolved with caller for each
       // interface call.
       if (method->is_public()) set_bytecode_1(invoke_code);
       set_bytecode_2(Bytecodes::_invokevirtual);
     } else {
       set_bytecode_2(invoke_code);
     }
   } else {
     ShouldNotReachHere();
   }
   NOT_PRODUCT(verify(tty));
 }
 void ConstantPoolCacheEntry::set_interface_call(methodHandle method, int index) {
   klassOop interf = method->method_holder();
   assert(instanceKlass::cast(interf)->is_interface(), "must be an interface");
   set_f1(interf);
   set_f2(index);
   set_flags(as_flags(as_TosState(method->result_type()), method->is_final_method(), false, false, false, true) | method()->size_of_parameters());
   set_bytecode_1(Bytecodes::_invokeinterface);
 }
 class LocalOopClosure: public OopClosure {
  private:
   void (*_f)(oop*);
  public:
   LocalOopClosure(void f(oop*))        { _f = f; }
   virtual void do_oop(oop* o)          { _f(o); }
 };
 void ConstantPoolCacheEntry::oops_do(void f(oop*)) {
   LocalOopClosure blk(f);
   oop_iterate(&blk);
 }
 void ConstantPoolCacheEntry::oop_iterate(OopClosure* blk) {
   assert(in_words(size()) == 4, "check code below - may need adjustment");
   // field[1] is always oop or NULL
   blk->do_oop((oop*)&_f1);
   if (is_vfinal()) {
     blk->do_oop((oop*)&_f2);
   }
 }
 void ConstantPoolCacheEntry::oop_iterate_m(OopClosure* blk, MemRegion mr) {
   assert(in_words(size()) == 4, "check code below - may need adjustment");
   // field[1] is always oop or NULL
   if (mr.contains((oop *)&_f1)) blk->do_oop((oop*)&_f1);
   if (is_vfinal()) {
     if (mr.contains((oop *)&_f2)) blk->do_oop((oop*)&_f2);
   }
 }
 void ConstantPoolCacheEntry::follow_contents() {
   assert(in_words(size()) == 4, "check code below - may need adjustment");
   // field[1] is always oop or NULL
   MarkSweep::mark_and_push((oop*)&_f1);
   if (is_vfinal()) {
     MarkSweep::mark_and_push((oop*)&_f2);
   }
 }
 #ifndef SERIALGC
 void ConstantPoolCacheEntry::follow_contents(ParCompactionManager* cm) {
   assert(in_words(size()) == 4, "check code below - may need adjustment");
   // field[1] is always oop or NULL
   PSParallelCompact::mark_and_push(cm, (oop*)&_f1);
   if (is_vfinal()) {
     PSParallelCompact::mark_and_push(cm, (oop*)&_f2);
   }
 }
 #endif // SERIALGC
 void ConstantPoolCacheEntry::adjust_pointers() {
   assert(in_words(size()) == 4, "check code below - may need adjustment");
   // field[1] is always oop or NULL
   MarkSweep::adjust_pointer((oop*)&_f1);
   if (is_vfinal()) {
     MarkSweep::adjust_pointer((oop*)&_f2);
   }
 }
 #ifndef SERIALGC
 void ConstantPoolCacheEntry::update_pointers() {
   assert(in_words(size()) == 4, "check code below - may need adjustment");
   // field[1] is always oop or NULL
   PSParallelCompact::adjust_pointer((oop*)&_f1);
   if (is_vfinal()) {
     PSParallelCompact::adjust_pointer((oop*)&_f2);
   }
 }
 void ConstantPoolCacheEntry::update_pointers(HeapWord* beg_addr,
                                              HeapWord* end_addr) {
   assert(in_words(size()) == 4, "check code below - may need adjustment");
   // field[1] is always oop or NULL
   PSParallelCompact::adjust_pointer((oop*)&_f1, beg_addr, end_addr);
   if (is_vfinal()) {
     PSParallelCompact::adjust_pointer((oop*)&_f2, beg_addr, end_addr);
   }
 }
 #endif // SERIALGC
 // RedefineClasses() API support:
 // If this constantPoolCacheEntry refers to old_method then update it
 // to refer to new_method.
 bool ConstantPoolCacheEntry::adjust_method_entry(methodOop old_method,
        methodOop new_method, bool * trace_name_printed) {
   if (is_vfinal()) {
     // virtual and final so f2() contains method ptr instead of vtable index
     if (f2() == (intptr_t)old_method) {
       // match old_method so need an update
       _f2 = (intptr_t)new_method;
       if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
         if (!(*trace_name_printed)) {
           // RC_TRACE_MESG macro has an embedded ResourceMark
           RC_TRACE_MESG(("adjust: name=%s",
             Klass::cast(old_method->method_holder())->external_name()));
           *trace_name_printed = true;
         }
         // RC_TRACE macro has an embedded ResourceMark
         RC_TRACE(0x00400000, ("cpc vf-entry update: %s(%s)",
           new_method->name()->as_C_string(),
           new_method->signature()->as_C_string()));
       }
       return true;
     }
     // f1() is not used with virtual entries so bail out
     return false;
   }
   if ((oop)_f1 == NULL) {
     // NULL f1() means this is a virtual entry so bail out
     // We are assuming that the vtable index does not need change.
     return false;
   }
   if ((oop)_f1 == old_method) {
     _f1 = new_method;
     if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
       if (!(*trace_name_printed)) {
         // RC_TRACE_MESG macro has an embedded ResourceMark
         RC_TRACE_MESG(("adjust: name=%s",
           Klass::cast(old_method->method_holder())->external_name()));
         *trace_name_printed = true;
       }
       // RC_TRACE macro has an embedded ResourceMark
       RC_TRACE(0x00400000, ("cpc entry update: %s(%s)",
         new_method->name()->as_C_string(),
         new_method->signature()->as_C_string()));
     }
     return true;
   }
   return false;
 }
 bool ConstantPoolCacheEntry::is_interesting_method_entry(klassOop k) {
   if (!is_method_entry()) {
     // not a method entry so not interesting by default
     return false;
   }
   methodOop m = NULL;
   if (is_vfinal()) {
     // virtual and final so _f2 contains method ptr instead of vtable index
     m = (methodOop)_f2;
   } else if ((oop)_f1 == NULL) {
     // NULL _f1 means this is a virtual entry so also not interesting
     return false;
   } else {
     if (!((oop)_f1)->is_method()) {
       // _f1 can also contain a klassOop for an interface
       return false;
     }
     m = (methodOop)_f1;
   }
   assert(m != NULL && m->is_method(), "sanity check");
   if (m == NULL || !m->is_method() || m->method_holder() != k) {
     // robustness for above sanity checks or method is not in
     // the interesting class
     return false;
   }
   // the method is in the interesting class so the entry is interesting
   return true;
 }
 void ConstantPoolCacheEntry::print(outputStream* st, int index) const {
   // print separator
   if (index == 0) tty->print_cr("                 -------------");
   // print entry
   tty->print_cr("%3d  (%08x)  [%02x|%02x|%5d]", index, this, bytecode_2(), bytecode_1(), constant_pool_index());
   tty->print_cr("                 [   %08x]", (address)(oop)_f1);
   tty->print_cr("                 [   %08x]", _f2);
   tty->print_cr("                 [   %08x]", _flags);
   tty->print_cr("                 -------------");
 }
 void ConstantPoolCacheEntry::verify(outputStream* st) const {
   // not implemented yet
 }
 // Implementation of ConstantPoolCache
 void constantPoolCacheOopDesc::initialize(intArray& inverse_index_map) {
   assert(inverse_index_map.length() == length(), "inverse index map must have same length as cache");
   for (int i = 0; i < length(); i++) entry_at(i)->set_initial_state(inverse_index_map[i]);
 }
 // RedefineClasses() API support:
 // If any entry of this constantPoolCache points to any of
 // old_methods, replace it with the corresponding new_method.
 void constantPoolCacheOopDesc::adjust_method_entries(methodOop* old_methods, methodOop* new_methods,
                                                      int methods_length, bool * trace_name_printed) {
   if (methods_length == 0) {
     // nothing to do if there are no methods
     return;
   }
   // get shorthand for the interesting class
   klassOop old_holder = old_methods[0]->method_holder();
   for (int i = 0; i < length(); i++) {
     if (!entry_at(i)->is_interesting_method_entry(old_holder)) {
       // skip uninteresting methods
       continue;
     }
     // The constantPoolCache contains entries for several different
     // things, but we only care about methods. In fact, we only care
     // about methods in the same class as the one that contains the
     // old_methods. At this point, we have an interesting entry.
     for (int j = 0; j < methods_length; j++) {
       methodOop old_method = old_methods[j];
       methodOop new_method = new_methods[j];
       if (entry_at(i)->adjust_method_entry(old_method, new_method,
           trace_name_printed)) {
         // current old_method matched this entry and we updated it so
         // break out and get to the next interesting entry if there one
         break;
       }
     }
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/cpCacheOop.cpp@a61af66fc99e (annotated)

src/share/vm/oops/cpCacheOop.cpp