jdk8-mips64-public/hotspot: src/share/vm/oops/cpCache.cpp@da91efe96a93 (annotated)

src/share/vm/oops/cpCache.cpp@da91efe96a93 (annotated)

src/share/vm/oops/cpCache.cpp

Sat, 01 Sep 2012 13:25:18 -0400

author: coleenp
date: Sat, 01 Sep 2012 13:25:18 -0400
changeset 4037: da91efe96a93
parent 3969: src/share/vm/oops/cpCacheOop.cpp@1d7922586cf6
child 4049: 4bfe8b33cf66
permissions: -rw-r--r--

6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>

 /*
  * Copyright (c) 1998, 2012, 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.
  *
  */
 #include "precompiled.hpp"
 #include "gc_implementation/shared/markSweep.inline.hpp"
 #include "interpreter/interpreter.hpp"
 #include "interpreter/rewriter.hpp"
 #include "memory/universe.inline.hpp"
 #include "oops/cpCache.hpp"
 #include "oops/objArrayOop.hpp"
 #include "oops/oop.inline.hpp"
 #include "prims/jvmtiRedefineClassesTrace.hpp"
 #include "prims/methodHandles.hpp"
 #include "runtime/handles.inline.hpp"
 #ifndef SERIALGC
 # include "gc_implementation/parallelScavenge/psPromotionManager.hpp"
 #endif
 // Implememtation of ConstantPoolCacheEntry
 void ConstantPoolCacheEntry::initialize_entry(int index) {
   assert(0 < index && index < 0x10000, "sanity check");
   _indices = index;
   assert(constant_pool_index() == index, "");
 }
 int ConstantPoolCacheEntry::make_flags(TosState state,
                                        int option_bits,
                                        int field_index_or_method_params) {
   assert(state < number_of_states, "Invalid state in make_flags");
   int f = ((int)state << tos_state_shift) | option_bits | field_index_or_method_params;
   // Preserve existing flag bit values
   // The low bits are a field offset, or else the method parameter size.
 #ifdef ASSERT
   TosState old_state = flag_state();
   assert(old_state == (TosState)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 << bytecode_1_shift));
 }
 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 << bytecode_2_shift));
 }
 // Sets f1, ordering with previous writes.
 void ConstantPoolCacheEntry::release_set_f1(Metadata* f1) {
   assert(f1 != NULL, "");
   OrderAccess::release_store_ptr((HeapWord*) &_f1, f1);
 }
 // Sets flags, but only if the value was previously zero.
 bool ConstantPoolCacheEntry::init_flags_atomic(intptr_t flags) {
   intptr_t result = Atomic::cmpxchg_ptr(flags, &_flags, 0);
   return (result == 0);
 }
 // 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 field_index,
                                        int field_offset,
                                        TosState field_type,
                                        bool is_final,
                                        bool is_volatile,
                                        Klass* root_klass) {
   set_f1(field_holder());
   set_f2(field_offset);
   assert((field_index & field_index_mask) == field_index,
          "field index does not fit in low flag bits");
   set_field_flags(field_type,
                   ((is_volatile ? 1 : 0) << is_volatile_shift) |
                   ((is_final    ? 1 : 0) << is_final_shift),
                   field_index);
   set_bytecode_1(get_code);
   set_bytecode_2(put_code);
   NOT_PRODUCT(verify(tty));
 }
 void ConstantPoolCacheEntry::set_parameter_size(int value) {
   // This routine is called only in corner cases where the CPCE is not yet initialized.
   // See AbstractInterpreter::deopt_continue_after_entry.
   assert(_flags == 0 || parameter_size() == 0 || parameter_size() == value,
          err_msg("size must not change: parameter_size=%d, value=%d", parameter_size(), value));
   // Setting the parameter size by itself is only safe if the
   // current value of _flags is 0, otherwise another thread may have
   // updated it and we don't want to overwrite that value.  Don't
   // bother trying to update it once it's nonzero but always make
   // sure that the final parameter size agrees with what was passed.
   if (_flags == 0) {
     Atomic::cmpxchg_ptr((value & parameter_size_mask), &_flags, 0);
   }
   guarantee(parameter_size() == value,
             err_msg("size must not change: parameter_size=%d, value=%d", parameter_size(), value));
 }
 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");
   int byte_no = -1;
   bool change_to_virtual = false;
   switch (invoke_code) {
     case Bytecodes::_invokeinterface:
       // We get here from InterpreterRuntime::resolve_invoke when an invokeinterface
       // instruction somehow links to a non-interface method (in Object).
       // In that case, the method has no itable index and must be invoked as a virtual.
       // Set a flag to keep track of this corner case.
       change_to_virtual = true;
       // ...and fall through as if we were handling invokevirtual:
     case Bytecodes::_invokevirtual:
       {
         if (method->can_be_statically_bound()) {
           // set_f2_as_vfinal_method checks if is_vfinal flag is true.
           set_method_flags(as_TosState(method->result_type()),
                            (                             1      << is_vfinal_shift) |
                            ((method->is_final_method() ? 1 : 0) << is_final_shift)  |
                            ((change_to_virtual         ? 1 : 0) << is_forced_virtual_shift),
                            method()->size_of_parameters());
           set_f2_as_vfinal_method(method());
         } else {
           assert(vtable_index >= 0, "valid index");
           assert(!method->is_final_method(), "sanity");
           set_method_flags(as_TosState(method->result_type()),
                            ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift),
                            method()->size_of_parameters());
           set_f2(vtable_index);
         }
         byte_no = 2;
         break;
       }
     case Bytecodes::_invokespecial:
     case Bytecodes::_invokestatic:
       // Note:  Read and preserve the value of the is_vfinal flag on any
       // invokevirtual bytecode shared with this constant pool cache entry.
       // It is cheap and safe to consult is_vfinal() at all times.
       // Once is_vfinal is set, it must stay that way, lest we get a dangling oop.
       set_method_flags(as_TosState(method->result_type()),
                        ((is_vfinal()               ? 1 : 0) << is_vfinal_shift) |
                        ((method->is_final_method() ? 1 : 0) << is_final_shift),
                        method()->size_of_parameters());
       set_f1(method());
       byte_no = 1;
       break;
     default:
       ShouldNotReachHere();
       break;
   }
   // Note:  byte_no also appears in TemplateTable::resolve.
   if (byte_no == 1) {
     assert(invoke_code != Bytecodes::_invokevirtual &&
            invoke_code != Bytecodes::_invokeinterface, "");
     set_bytecode_1(invoke_code);
   } else if (byte_no == 2)  {
     if (change_to_virtual) {
       assert(invoke_code == Bytecodes::_invokeinterface, "");
       // 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);
     } else {
       assert(invoke_code == Bytecodes::_invokevirtual, "");
     }
     // set up for invokevirtual, even if linking for invokeinterface also:
     set_bytecode_2(Bytecodes::_invokevirtual);
   } else {
     ShouldNotReachHere();
   }
   NOT_PRODUCT(verify(tty));
 }
 void ConstantPoolCacheEntry::set_interface_call(methodHandle method, int index) {
   Klass* interf = method->method_holder();
   assert(InstanceKlass::cast(interf)->is_interface(), "must be an interface");
   assert(!method->is_final_method(), "interfaces do not have final methods; cannot link to one here");
   set_f1(interf);
   set_f2(index);
   set_method_flags(as_TosState(method->result_type()),
 ,  // no option bits
                    method()->size_of_parameters());
   set_bytecode_1(Bytecodes::_invokeinterface);
 }
 void ConstantPoolCacheEntry::set_method_handle(methodHandle adapter, Handle appendix,
                                                objArrayHandle resolved_references) {
   set_method_handle_common(Bytecodes::_invokehandle, adapter, appendix, resolved_references);
 }
 void ConstantPoolCacheEntry::set_dynamic_call(methodHandle adapter, Handle appendix,
                                               objArrayHandle resolved_references) {
   set_method_handle_common(Bytecodes::_invokedynamic, adapter, appendix, resolved_references);
 }
 void ConstantPoolCacheEntry::set_method_handle_common(Bytecodes::Code invoke_code,
                                                       methodHandle adapter,
                                                       Handle appendix,
                                                       objArrayHandle resolved_references) {
   // NOTE: This CPCE can be the subject of data races.
   // There are three words to update: flags, refs[f2], f1 (in that order).
   // Writers must store all other values before f1.
   // Readers must test f1 first for non-null before reading other fields.
   // Competing writers must acquire exclusive access on the first
   // write, to flags, using a compare/exchange.
   // A losing writer to flags must spin until the winner writes f1,
   // so that when he returns, he can use the linked cache entry.
   bool has_appendix = appendix.not_null();
   // Write the flags.
   bool owner =
     init_method_flags_atomic(as_TosState(adapter->result_type()),
                    ((has_appendix ?  1 : 0) << has_appendix_shift) |
                    (                 1      << is_final_shift),
                    adapter->size_of_parameters());
   if (!owner) {
     // Somebody else is working on the same CPCE.  Let them proceed.
     while (is_f1_null()) {
       // Pause momentarily on a low-level lock, to allow racing thread to win.
       MutexLockerEx mu(Patching_lock, Mutex::_no_safepoint_check_flag);
       os::yield();
     }
     return;
   }
   if (TraceInvokeDynamic) {
     tty->print_cr("set_method_handle bc=%d appendix="PTR_FORMAT"%s method="PTR_FORMAT" ",
                   invoke_code,
                   (intptr_t)appendix(), (has_appendix ? "" : " (unused)"),
                   (intptr_t)adapter());
     adapter->print();
     if (has_appendix)  appendix()->print();
   }
   // Method handle invokes and invokedynamic sites use both cp cache words.
   // refs[f2], if not null, contains a value passed as a trailing argument to the adapter.
   // In the general case, this could be the call site's MethodType,
   // for use with java.lang.Invokers.checkExactType, or else a CallSite object.
   // f1 contains the adapter method which manages the actual call.
   // In the general case, this is a compiled LambdaForm.
   // (The Java code is free to optimize these calls by binding other
   // sorts of methods and appendices to call sites.)
   // JVM-level linking is via f1, as if for invokespecial, and signatures are erased.
   // The appendix argument (if any) is added to the signature, and is counted in the parameter_size bits.
   // Even with the appendix, the method will never take more than 255 parameter slots.
   //
   // This means that given a call site like (List)mh.invoke("foo"),
   // the f1 method has signature '(Ljl/Object;Ljl/invoke/MethodType;)Ljl/Object;',
   // not '(Ljava/lang/String;)Ljava/util/List;'.
   // The fact that String and List are involved is encoded in the MethodType in refs[f2].
   // This allows us to create fewer method oops, while keeping type safety.
   //
   if (has_appendix) {
     int ref_index = f2_as_index();
     assert(ref_index >= 0 && ref_index < resolved_references->length(), "oob");
     assert(resolved_references->obj_at(ref_index) == NULL, "init just once");
     resolved_references->obj_at_put(ref_index, appendix());
   }
   release_set_f1(adapter());  // This must be the last one to set (see NOTE above)!
     // The interpreter assembly code does not check byte_2,
     // but it is used by is_resolved, method_if_resolved, etc.
   set_bytecode_1(invoke_code);
   NOT_PRODUCT(verify(tty));
   if (TraceInvokeDynamic) {
     this->print(tty, 0);
   }
 }
 Method* ConstantPoolCacheEntry::method_if_resolved(constantPoolHandle cpool) {
   // Decode the action of set_method and set_interface_call
   Bytecodes::Code invoke_code = bytecode_1();
   if (invoke_code != (Bytecodes::Code)0) {
     Metadata* f1 = (Metadata*)_f1;
     if (f1 != NULL) {
       switch (invoke_code) {
       case Bytecodes::_invokeinterface:
         assert(f1->is_klass(), "");
         return klassItable::method_for_itable_index((Klass*)f1, f2_as_index());
       case Bytecodes::_invokestatic:
       case Bytecodes::_invokespecial:
         assert(!has_appendix(), "");
       case Bytecodes::_invokehandle:
       case Bytecodes::_invokedynamic:
         assert(f1->is_method(), "");
         return (Method*)f1;
       }
     }
   }
   invoke_code = bytecode_2();
   if (invoke_code != (Bytecodes::Code)0) {
     switch (invoke_code) {
     case Bytecodes::_invokevirtual:
       if (is_vfinal()) {
         // invokevirtual
         Method* m = f2_as_vfinal_method();
         assert(m->is_method(), "");
         return m;
       } else {
         int holder_index = cpool->uncached_klass_ref_index_at(constant_pool_index());
         if (cpool->tag_at(holder_index).is_klass()) {
           Klass* klass = cpool->resolved_klass_at(holder_index);
           if (!Klass::cast(klass)->oop_is_instance())
             klass = SystemDictionary::Object_klass();
           return InstanceKlass::cast(klass)->method_at_vtable(f2_as_index());
         }
       }
       break;
     }
   }
   return NULL;
 }
 oop ConstantPoolCacheEntry::appendix_if_resolved(constantPoolHandle cpool) {
   if (is_f1_null() || !has_appendix())
     return NULL;
   int ref_index = f2_as_index();
   objArrayOop resolved_references = cpool->resolved_references();
   return resolved_references->obj_at(ref_index);
 }
 // RedefineClasses() API support:
 // If this constantPoolCacheEntry refers to old_method then update it
 // to refer to new_method.
 bool ConstantPoolCacheEntry::adjust_method_entry(Method* old_method,
        Method* new_method, bool * trace_name_printed) {
   if (is_vfinal()) {
     // virtual and final so _f2 contains method ptr instead of vtable index
     if (f2_as_vfinal_method() == old_method) {
       // match old_method so need an update
       // NOTE: can't use set_f2_as_vfinal_method as it asserts on different values
       _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 (_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 (_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;
 }
 #ifndef PRODUCT
 bool ConstantPoolCacheEntry::check_no_old_entries() {
   if (is_vfinal()) {
     Metadata* f2 = (Metadata*)_f2;
     return (f2->is_valid() && f2->is_method() && !((Method*)f2)->is_old());
   } else {
     return (_f1 == NULL || (_f1->is_valid() && _f1->is_method() && !((Method*)_f1)->is_old()));
   }
 }
 #endif
 bool ConstantPoolCacheEntry::is_interesting_method_entry(Klass* k) {
   if (!is_method_entry()) {
     // not a method entry so not interesting by default
     return false;
   }
   Method* m = NULL;
   if (is_vfinal()) {
     // virtual and final so _f2 contains method ptr instead of vtable index
     m = f2_as_vfinal_method();
   } else if (is_f1_null()) {
     // NULL _f1 means this is a virtual entry so also not interesting
     return false;
   } else {
     if (!(_f1->is_method())) {
       // _f1 can also contain a Klass* for an interface
       return false;
     }
     m = f1_as_method();
   }
   assert(m != NULL && m->is_method(), "sanity check");
   if (m == NULL || !m->is_method() || (k != NULL && 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) st->print_cr("                 -------------");
   // print entry
   st->print("%3d  ("PTR_FORMAT")  ", index, (intptr_t)this);
     st->print_cr("[%02x|%02x|%5d]", bytecode_2(), bytecode_1(), constant_pool_index());
   st->print_cr("                 [   "PTR_FORMAT"]", (intptr_t)_f1);
   st->print_cr("                 [   "PTR_FORMAT"]", (intptr_t)_f2);
   st->print_cr("                 [   "PTR_FORMAT"]", (intptr_t)_flags);
   st->print_cr("                 -------------");
 }
 void ConstantPoolCacheEntry::verify(outputStream* st) const {
   // not implemented yet
 }
 // Implementation of ConstantPoolCache
 ConstantPoolCache* ConstantPoolCache::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
   int size = ConstantPoolCache::size(length);
   return new (loader_data, size, false, THREAD) ConstantPoolCache(length);
 }
 void ConstantPoolCache::initialize(intArray& inverse_index_map, intArray& invokedynamic_references_map) {
   assert(inverse_index_map.length() == length(), "inverse index map must have same length as cache");
   for (int i = 0; i < length(); i++) {
     ConstantPoolCacheEntry* e = entry_at(i);
     int original_index = inverse_index_map[i];
       e->initialize_entry(original_index);
     assert(entry_at(i) == e, "sanity");
     }
   for (int ref = 0; ref < invokedynamic_references_map.length(); ref++) {
     int cpci = invokedynamic_references_map[ref];
     if (cpci >= 0)
       entry_at(cpci)->initialize_resolved_reference_index(ref);
   }
 }
 // RedefineClasses() API support:
 // If any entry of this constantPoolCache points to any of
 // old_methods, replace it with the corresponding new_method.
 void ConstantPoolCache::adjust_method_entries(Method** old_methods, Method** 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
   Klass* 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++) {
       Method* old_method = old_methods[j];
       Method* 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;
       }
     }
   }
 }
 #ifndef PRODUCT
 bool ConstantPoolCache::check_no_old_entries() {
   for (int i = 1; i < length(); i++) {
     if (entry_at(i)->is_interesting_method_entry(NULL) &&
        !entry_at(i)->check_no_old_entries()) {
       return false;
     }
   }
   return true;
 }
 #endif // PRODUCT
 // Printing
 void ConstantPoolCache::print_on(outputStream* st) const {
   assert(is_constantPoolCache(), "obj must be constant pool cache");
   st->print_cr(internal_name());
   // print constant pool cache entries
   for (int i = 0; i < length(); i++) entry_at(i)->print(st, i);
 }
 void ConstantPoolCache::print_value_on(outputStream* st) const {
   assert(is_constantPoolCache(), "obj must be constant pool cache");
   st->print("cache [%d]", length());
   print_address_on(st);
   st->print(" for ");
   constant_pool()->print_value_on(st);
 }
 // Verification
 void ConstantPoolCache::verify_on(outputStream* st) {
   guarantee(is_constantPoolCache(), "obj must be constant pool cache");
   // print constant pool cache entries
   for (int i = 0; i < length(); i++) entry_at(i)->verify(st);
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/cpCache.cpp@da91efe96a93 (annotated)

src/share/vm/oops/cpCache.cpp