Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright 1997-2009 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/_methodOop.cpp.incl"

 // Implementation of methodOopDesc

 address methodOopDesc::get_i2c_entry() {

   assert(_adapter != NULL, "must have");

   return _adapter->get_i2c_entry();

 }

 address methodOopDesc::get_c2i_entry() {

   assert(_adapter != NULL, "must have");

   return _adapter->get_c2i_entry();

 }

 address methodOopDesc::get_c2i_unverified_entry() {

   assert(_adapter != NULL, "must have");

   return _adapter->get_c2i_unverified_entry();

 }

 char* methodOopDesc::name_and_sig_as_C_string() {

   return name_and_sig_as_C_string(Klass::cast(constants()->pool_holder()), name(), signature());

 }

 char* methodOopDesc::name_and_sig_as_C_string(char* buf, int size) {

   return name_and_sig_as_C_string(Klass::cast(constants()->pool_holder()), name(), signature(), buf, size);

 }

 char* methodOopDesc::name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature) {

   const char* klass_name = klass->external_name();

   int klass_name_len  = (int)strlen(klass_name);

   int method_name_len = method_name->utf8_length();

   int len             = klass_name_len + 1 + method_name_len + signature->utf8_length();

   char* dest          = NEW_RESOURCE_ARRAY(char, len + 1);

   strcpy(dest, klass_name);

   dest[klass_name_len] = '.';

   strcpy(&dest[klass_name_len + 1], method_name->as_C_string());

   strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());

   dest[len] = 0;

   return dest;

 }

 char* methodOopDesc::name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature, char* buf, int size) {

   symbolOop klass_name = klass->name();

   klass_name->as_klass_external_name(buf, size);

   int len = (int)strlen(buf);

   if (len < size - 1) {

     buf[len++] = '.';

     method_name->as_C_string(&(buf[len]), size - len);

     len = (int)strlen(buf);

     signature->as_C_string(&(buf[len]), size - len);

   }

   return buf;

 }

 int  methodOopDesc::fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS) {

   // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)

   const int beg_bci_offset     = 0;

   const int end_bci_offset     = 1;

   const int handler_bci_offset = 2;

   const int klass_index_offset = 3;

   const int entry_size         = 4;

   // access exception table

   typeArrayHandle table (THREAD, constMethod()->exception_table());

   int length = table->length();

   assert(length % entry_size == 0, "exception table format has changed");

   // iterate through all entries sequentially

   constantPoolHandle pool(THREAD, constants());

   for (int i = 0; i < length; i += entry_size) {

     int beg_bci = table->int_at(i + beg_bci_offset);

     int end_bci = table->int_at(i + end_bci_offset);

     assert(beg_bci <= end_bci, "inconsistent exception table");

     if (beg_bci <= throw_bci && throw_bci < end_bci) {

       // exception handler bci range covers throw_bci => investigate further

       int handler_bci = table->int_at(i + handler_bci_offset);

       int klass_index = table->int_at(i + klass_index_offset);

       if (klass_index == 0) {

         return handler_bci;

       } else if (ex_klass.is_null()) {

         return handler_bci;

       } else {

         // we know the exception class => get the constraint class

         // this may require loading of the constraint class; if verification

         // fails or some other exception occurs, return handler_bci

         klassOop k = pool->klass_at(klass_index, CHECK_(handler_bci));

         KlassHandle klass = KlassHandle(THREAD, k);

         assert(klass.not_null(), "klass not loaded");

         if (ex_klass->is_subtype_of(klass())) {

           return handler_bci;

         }

       }

     }

   }

   return -1;

 }

 methodOop methodOopDesc::method_from_bcp(address bcp) {

   debug_only(static int count = 0; count++);

   assert(Universe::heap()->is_in_permanent(bcp), "bcp not in perm_gen");

   // TO DO: this may be unsafe in some configurations

   HeapWord* p = Universe::heap()->block_start(bcp);

   assert(Universe::heap()->block_is_obj(p), "must be obj");

   assert(oop(p)->is_constMethod(), "not a method");

   return constMethodOop(p)->method();

 }

 void methodOopDesc::mask_for(int bci, InterpreterOopMap* mask) {

   Thread* myThread    = Thread::current();

   methodHandle h_this(myThread, this);

 #ifdef ASSERT

   bool has_capability = myThread->is_VM_thread() ||

                         myThread->is_ConcurrentGC_thread() ||

                         myThread->is_GC_task_thread();

   if (!has_capability) {

     if (!VerifyStack && !VerifyLastFrame) {

       // verify stack calls this outside VM thread

       warning("oopmap should only be accessed by the "

               "VM, GC task or CMS threads (or during debugging)");

       InterpreterOopMap local_mask;

       instanceKlass::cast(method_holder())->mask_for(h_this, bci, &local_mask);

       local_mask.print();

     }

   }

 #endif

   instanceKlass::cast(method_holder())->mask_for(h_this, bci, mask);

   return;

 }

 int methodOopDesc::bci_from(address bcp) const {

   assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), "bcp doesn't belong to this method");

   return bcp - code_base();

 }

 // Return (int)bcx if it appears to be a valid BCI.

 // Return bci_from((address)bcx) if it appears to be a valid BCP.

 // Return -1 otherwise.

 // Used by profiling code, when invalid data is a possibility.

 // The caller is responsible for validating the methodOop itself.

 int methodOopDesc::validate_bci_from_bcx(intptr_t bcx) const {

   // keep bci as -1 if not a valid bci

   int bci = -1;

   if (bcx == 0 || (address)bcx == code_base()) {

     // code_size() may return 0 and we allow 0 here

     // the method may be native

     bci = 0;

   } else if (frame::is_bci(bcx)) {

     if (bcx < code_size()) {

       bci = (int)bcx;

     }

   } else if (contains((address)bcx)) {

     bci = (address)bcx - code_base();

   }

   // Assert that if we have dodged any asserts, bci is negative.

   assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");

   return bci;

 }

 address methodOopDesc::bcp_from(int bci) const {

   assert((is_native() && bci == 0)  || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci");

   address bcp = code_base() + bci;

   assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");

   return bcp;

 }

 int methodOopDesc::object_size(bool is_native) {

   // If native, then include pointers for native_function and signature_handler

   int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;

   int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;

   return align_object_size(header_size() + extra_words);

 }

 symbolOop methodOopDesc::klass_name() const {

   klassOop k = method_holder();

   assert(k->is_klass(), "must be klass");

   instanceKlass* ik = (instanceKlass*) k->klass_part();

   return ik->name();

 }

 void methodOopDesc::set_interpreter_kind() {

   int kind = Interpreter::method_kind(methodOop(this));

   assert(kind != Interpreter::invalid,

          "interpreter entry must be valid");

   set_interpreter_kind(kind);

 }

 // Attempt to return method oop to original state.  Clear any pointers

 // (to objects outside the shared spaces).  We won't be able to predict

 // where they should point in a new JVM.  Further initialize some

 // entries now in order allow them to be write protected later.

 void methodOopDesc::remove_unshareable_info() {

   unlink_method();

   set_interpreter_kind();

 }

 bool methodOopDesc::was_executed_more_than(int n) const {

   // Invocation counter is reset when the methodOop is compiled.

   // If the method has compiled code we therefore assume it has

   // be excuted more than n times.

   if (is_accessor() || is_empty_method() || (code() != NULL)) {

     // interpreter doesn't bump invocation counter of trivial methods

     // compiler does not bump invocation counter of compiled methods

     return true;

   } else if (_invocation_counter.carry()) {

     // The carry bit is set when the counter overflows and causes

     // a compilation to occur.  We don't know how many times

     // the counter has been reset, so we simply assume it has

     // been executed more than n times.

     return true;

   } else {

     return invocation_count() > n;

   }

 }

 #ifndef PRODUCT

 void methodOopDesc::print_invocation_count() const {

   if (is_static()) tty->print("static ");

   if (is_final()) tty->print("final ");

   if (is_synchronized()) tty->print("synchronized ");

   if (is_native()) tty->print("native ");

   method_holder()->klass_part()->name()->print_symbol_on(tty);

   tty->print(".");

   name()->print_symbol_on(tty);

   signature()->print_symbol_on(tty);

   if (WizardMode) {

     // dump the size of the byte codes

     tty->print(" {%d}", code_size());

   }

   tty->cr();

   tty->print_cr ("  interpreter_invocation_count: %8d ", interpreter_invocation_count());

   tty->print_cr ("  invocation_counter:           %8d ", invocation_count());

   tty->print_cr ("  backedge_counter:             %8d ", backedge_count());

   if (CountCompiledCalls) {

     tty->print_cr ("  compiled_invocation_count: %8d ", compiled_invocation_count());

   }

 }

 #endif

 // Build a methodDataOop object to hold information about this method

 // collected in the interpreter.

 void methodOopDesc::build_interpreter_method_data(methodHandle method, TRAPS) {

   // Grab a lock here to prevent multiple

   // methodDataOops from being created.

   MutexLocker ml(MethodData_lock, THREAD);

   if (method->method_data() == NULL) {

     methodDataOop method_data = oopFactory::new_methodData(method, CHECK);

     method->set_method_data(method_data);

     if (PrintMethodData && (Verbose || WizardMode)) {

       ResourceMark rm(THREAD);

       tty->print("build_interpreter_method_data for ");

       method->print_name(tty);

       tty->cr();

       // At the end of the run, the MDO, full of data, will be dumped.

     }

   }

 }

 void methodOopDesc::cleanup_inline_caches() {

   // The current system doesn't use inline caches in the interpreter

   // => nothing to do (keep this method around for future use)

 }

 int methodOopDesc::extra_stack_words() {

   // not an inline function, to avoid a header dependency on Interpreter

   return extra_stack_entries() * Interpreter::stackElementSize();

 }

 void methodOopDesc::compute_size_of_parameters(Thread *thread) {

   symbolHandle h_signature(thread, signature());

   ArgumentSizeComputer asc(h_signature);

   set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));

 }

 #ifdef CC_INTERP

 void methodOopDesc::set_result_index(BasicType type)          {

   _result_index = Interpreter::BasicType_as_index(type);

 }

 #endif

 BasicType methodOopDesc::result_type() const {

   ResultTypeFinder rtf(signature());

   return rtf.type();

 }

 bool methodOopDesc::is_empty_method() const {

   return  code_size() == 1

       && *code_base() == Bytecodes::_return;

 }

 bool methodOopDesc::is_vanilla_constructor() const {

   // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method

   // which only calls the superclass vanilla constructor and possibly does stores of

   // zero constants to local fields:

   //

   //   aload_0

   //   invokespecial

   //   indexbyte1

   //   indexbyte2

   //

   // followed by an (optional) sequence of:

   //

   //   aload_0

   //   aconst_null / iconst_0 / fconst_0 / dconst_0

   //   putfield

   //   indexbyte1

   //   indexbyte2

   //

   // followed by:

   //

   //   return

   assert(name() == vmSymbols::object_initializer_name(),    "Should only be called for default constructors");

   assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");

   int size = code_size();

   // Check if size match

   if (size == 0 || size % 5 != 0) return false;

   address cb = code_base();

   int last = size - 1;

   if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {

     // Does not call superclass default constructor

     return false;

   }

   // Check optional sequence

   for (int i = 4; i < last; i += 5) {

     if (cb[i] != Bytecodes::_aload_0) return false;

     if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;

     if (cb[i+2] != Bytecodes::_putfield) return false;

   }

   return true;

 }

 bool methodOopDesc::compute_has_loops_flag() {

   BytecodeStream bcs(methodOop(this));

   Bytecodes::Code bc;

   while ((bc = bcs.next()) >= 0) {

     switch( bc ) {

       case Bytecodes::_ifeq:

       case Bytecodes::_ifnull:

       case Bytecodes::_iflt:

       case Bytecodes::_ifle:

       case Bytecodes::_ifne:

       case Bytecodes::_ifnonnull:

       case Bytecodes::_ifgt:

       case Bytecodes::_ifge:

       case Bytecodes::_if_icmpeq:

       case Bytecodes::_if_icmpne:

       case Bytecodes::_if_icmplt:

       case Bytecodes::_if_icmpgt:

       case Bytecodes::_if_icmple:

       case Bytecodes::_if_icmpge:

       case Bytecodes::_if_acmpeq:

       case Bytecodes::_if_acmpne:

       case Bytecodes::_goto:

       case Bytecodes::_jsr:

         if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();

         break;

       case Bytecodes::_goto_w:

       case Bytecodes::_jsr_w:

         if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();

         break;

     }

   }

   _access_flags.set_loops_flag_init();

   return _access_flags.has_loops();

 }

 bool methodOopDesc::is_final_method() const {

   // %%% Should return true for private methods also,

   // since there is no way to override them.

   return is_final() || Klass::cast(method_holder())->is_final();

 }

 bool methodOopDesc::is_strict_method() const {

   return is_strict();

 }

 bool methodOopDesc::can_be_statically_bound() const {

   if (is_final_method())  return true;

   return vtable_index() == nonvirtual_vtable_index;

 }

 bool methodOopDesc::is_accessor() const {

   if (code_size() != 5) return false;

   if (size_of_parameters() != 1) return false;

   methodOop m = (methodOop)this;  // pass to code_at() to avoid method_from_bcp

   if (Bytecodes::java_code_at(code_base()+0, m) != Bytecodes::_aload_0 ) return false;

   if (Bytecodes::java_code_at(code_base()+1, m) != Bytecodes::_getfield) return false;

   if (Bytecodes::java_code_at(code_base()+4, m) != Bytecodes::_areturn &&

       Bytecodes::java_code_at(code_base()+4, m) != Bytecodes::_ireturn ) return false;

   return true;

 }

 bool methodOopDesc::is_initializer() const {

   return name() == vmSymbols::object_initializer_name() || name() == vmSymbols::class_initializer_name();

 }

 objArrayHandle methodOopDesc::resolved_checked_exceptions_impl(methodOop this_oop, TRAPS) {

   int length = this_oop->checked_exceptions_length();

   if (length == 0) {  // common case

     return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());

   } else {

     methodHandle h_this(THREAD, this_oop);

     objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));

     objArrayHandle mirrors (THREAD, m_oop);

     for (int i = 0; i < length; i++) {

       CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe

       klassOop k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));

       assert(Klass::cast(k)->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");

       mirrors->obj_at_put(i, Klass::cast(k)->java_mirror());

     }

     return mirrors;

   }

 };

 int methodOopDesc::line_number_from_bci(int bci) const {

   if (bci == SynchronizationEntryBCI) bci = 0;

   assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");

   int best_bci  =  0;

   int best_line = -1;

   if (has_linenumber_table()) {

     // The line numbers are a short array of 2-tuples [start_pc, line_number].

     // Not necessarily sorted and not necessarily one-to-one.

     CompressedLineNumberReadStream stream(compressed_linenumber_table());

     while (stream.read_pair()) {

       if (stream.bci() == bci) {

         // perfect match

         return stream.line();

       } else {

         // update best_bci/line

         if (stream.bci() < bci && stream.bci() >= best_bci) {

           best_bci  = stream.bci();

           best_line = stream.line();

         }

       }

     }

   }

   return best_line;

 }

 bool methodOopDesc::is_klass_loaded_by_klass_index(int klass_index) const {

   if( _constants->tag_at(klass_index).is_unresolved_klass() ) {

     Thread *thread = Thread::current();

     symbolHandle klass_name(thread, _constants->klass_name_at(klass_index));

     Handle loader(thread, instanceKlass::cast(method_holder())->class_loader());

     Handle prot  (thread, Klass::cast(method_holder())->protection_domain());

     return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;

   } else {

     return true;

   }

 }

 bool methodOopDesc::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {

   int klass_index = _constants->klass_ref_index_at(refinfo_index);

   if (must_be_resolved) {

     // Make sure klass is resolved in constantpool.

     if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;

   }

   return is_klass_loaded_by_klass_index(klass_index);

 }

 void methodOopDesc::set_native_function(address function, bool post_event_flag) {

   assert(function != NULL, "use clear_native_function to unregister natives");

   address* native_function = native_function_addr();

   // We can see racers trying to place the same native function into place. Once

   // is plenty.

   address current = *native_function;

   if (current == function) return;

   if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&

       function != NULL) {

     // native_method_throw_unsatisfied_link_error_entry() should only

     // be passed when post_event_flag is false.

     assert(function !=

       SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),

       "post_event_flag mis-match");

     // post the bind event, and possible change the bind function

     JvmtiExport::post_native_method_bind(this, &function);

   }

   *native_function = function;

   // This function can be called more than once. We must make sure that we always

   // use the latest registered method -> check if a stub already has been generated.

   // If so, we have to make it not_entrant.

   nmethod* nm = code(); // Put it into local variable to guard against concurrent updates

   if (nm != NULL) {

     nm->make_not_entrant();

   }

 }

 bool methodOopDesc::has_native_function() const {

   address func = native_function();

   return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());

 }

 void methodOopDesc::clear_native_function() {

   set_native_function(

     SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),

     !native_bind_event_is_interesting);

   clear_code();

 }

 void methodOopDesc::set_signature_handler(address handler) {

   address* signature_handler =  signature_handler_addr();

   *signature_handler = handler;

 }

 bool methodOopDesc::is_not_compilable(int comp_level) const {

   if (is_method_handle_invoke()) {

     // compilers must recognize this method specially, or not at all

     return true;

   }

   methodDataOop mdo = method_data();

   if (mdo != NULL

       && (uint)mdo->decompile_count() > (uint)PerMethodRecompilationCutoff) {

     // Since (uint)-1 is large, -1 really means 'no cutoff'.

     return true;

   }

 #ifdef COMPILER2

   if (is_tier1_compile(comp_level)) {

     if (is_not_tier1_compilable()) {

       return true;

     }

   }

 #endif // COMPILER2

   return (_invocation_counter.state() == InvocationCounter::wait_for_nothing)

           || (number_of_breakpoints() > 0);

 }

 // call this when compiler finds that this method is not compilable

 void methodOopDesc::set_not_compilable(int comp_level) {

   if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {

     ttyLocker ttyl;

     xtty->begin_elem("make_not_compilable thread='%d'", (int) os::current_thread_id());

     xtty->method(methodOop(this));

     xtty->stamp();

     xtty->end_elem();

   }

 #ifdef COMPILER2

   if (is_tier1_compile(comp_level)) {

     set_not_tier1_compilable();

     return;

   }

 #endif /* COMPILER2 */

   assert(comp_level == CompLevel_highest_tier, "unexpected compilation level");

   invocation_counter()->set_state(InvocationCounter::wait_for_nothing);

   backedge_counter()->set_state(InvocationCounter::wait_for_nothing);

 }

 // Revert to using the interpreter and clear out the nmethod

 void methodOopDesc::clear_code() {

   // this may be NULL if c2i adapters have not been made yet

   // Only should happen at allocate time.

   if (_adapter == NULL) {

     _from_compiled_entry    = NULL;

   } else {

     _from_compiled_entry    = _adapter->get_c2i_entry();

   }

   OrderAccess::storestore();

   _from_interpreted_entry = _i2i_entry;

   OrderAccess::storestore();

   _code = NULL;

 }

 // Called by class data sharing to remove any entry points (which are not shared)

 void methodOopDesc::unlink_method() {

   _code = NULL;

   _i2i_entry = NULL;

   _from_interpreted_entry = NULL;

   if (is_native()) {

     *native_function_addr() = NULL;

     set_signature_handler(NULL);

   }

   NOT_PRODUCT(set_compiled_invocation_count(0);)

   invocation_counter()->reset();

   backedge_counter()->reset();

   _adapter = NULL;

   _from_compiled_entry = NULL;

   assert(_method_data == NULL, "unexpected method data?");

   set_method_data(NULL);

   set_interpreter_throwout_count(0);

   set_interpreter_invocation_count(0);

   _highest_tier_compile = CompLevel_none;

 }

 // Called when the method_holder is getting linked. Setup entrypoints so the method

 // is ready to be called from interpreter, compiler, and vtables.

 void methodOopDesc::link_method(methodHandle h_method, TRAPS) {

   assert(_i2i_entry == NULL, "should only be called once");

   assert(_adapter == NULL, "init'd to NULL" );

   assert( _code == NULL, "nothing compiled yet" );

   // Setup interpreter entrypoint

   assert(this == h_method(), "wrong h_method()" );

   address entry = Interpreter::entry_for_method(h_method);

   assert(entry != NULL, "interpreter entry must be non-null");

   // Sets both _i2i_entry and _from_interpreted_entry

   set_interpreter_entry(entry);

   if (is_native() && !is_method_handle_invoke()) {

     set_native_function(

       SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),

       !native_bind_event_is_interesting);

   }

   // Setup compiler entrypoint.  This is made eagerly, so we do not need

   // special handling of vtables.  An alternative is to make adapters more

   // lazily by calling make_adapter() from from_compiled_entry() for the

   // normal calls.  For vtable calls life gets more complicated.  When a

   // call-site goes mega-morphic we need adapters in all methods which can be

   // called from the vtable.  We need adapters on such methods that get loaded

   // later.  Ditto for mega-morphic itable calls.  If this proves to be a

   // problem we'll make these lazily later.

   (void) make_adapters(h_method, CHECK);

   // ONLY USE the h_method now as make_adapter may have blocked

 }

 address methodOopDesc::make_adapters(methodHandle mh, TRAPS) {

   // Adapters for compiled code are made eagerly here.  They are fairly

   // small (generally < 100 bytes) and quick to make (and cached and shared)

   // so making them eagerly shouldn't be too expensive.

   AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);

   if (adapter == NULL ) {

     THROW_0(vmSymbols::java_lang_OutOfMemoryError());

   }

   mh->set_adapter_entry(adapter);

   mh->_from_compiled_entry = adapter->get_c2i_entry();

   return adapter->get_c2i_entry();

 }

 // The verified_code_entry() must be called when a invoke is resolved

 // on this method.

 // It returns the compiled code entry point, after asserting not null.

 // This function is called after potential safepoints so that nmethod

 // or adapter that it points to is still live and valid.

 // This function must not hit a safepoint!

 address methodOopDesc::verified_code_entry() {

   debug_only(No_Safepoint_Verifier nsv;)

   assert(_from_compiled_entry != NULL, "must be set");

   return _from_compiled_entry;

 }

 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all

 // (could be racing a deopt).

 // Not inline to avoid circular ref.

 bool methodOopDesc::check_code() const {

   // cached in a register or local.  There's a race on the value of the field.

   nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);

   return code == NULL || (code->method() == NULL) || (code->method() == (methodOop)this && !code->is_osr_method());

 }

 // Install compiled code.  Instantly it can execute.

 void methodOopDesc::set_code(methodHandle mh, nmethod *code) {

   assert( code, "use clear_code to remove code" );

   assert( mh->check_code(), "" );

   guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");

   // These writes must happen in this order, because the interpreter will

   // directly jump to from_interpreted_entry which jumps to an i2c adapter

   // which jumps to _from_compiled_entry.

   mh->_code = code;             // Assign before allowing compiled code to exec

   int comp_level = code->comp_level();

   // In theory there could be a race here. In practice it is unlikely

   // and not worth worrying about.

   if (comp_level > highest_tier_compile()) {

     set_highest_tier_compile(comp_level);

   }

   OrderAccess::storestore();

   mh->_from_compiled_entry = code->verified_entry_point();

   OrderAccess::storestore();

   // Instantly compiled code can execute.

   mh->_from_interpreted_entry = mh->get_i2c_entry();

 }

 bool methodOopDesc::is_overridden_in(klassOop k) const {

   instanceKlass* ik = instanceKlass::cast(k);

   if (ik->is_interface()) return false;

   // If method is an interface, we skip it - except if it

   // is a miranda method

   if (instanceKlass::cast(method_holder())->is_interface()) {

     // Check that method is not a miranda method

     if (ik->lookup_method(name(), signature()) == NULL) {

       // No implementation exist - so miranda method

       return false;

     }

     return true;

   }

   assert(ik->is_subclass_of(method_holder()), "should be subklass");

   assert(ik->vtable() != NULL, "vtable should exist");

   if (vtable_index() == nonvirtual_vtable_index) {

     return false;

   } else {

     methodOop vt_m = ik->method_at_vtable(vtable_index());

     return vt_m != methodOop(this);

   }

 }

 // give advice about whether this methodOop should be cached or not

 bool methodOopDesc::should_not_be_cached() const {

   if (is_old()) {

     // This method has been redefined. It is either EMCP or obsolete

     // and we don't want to cache it because that would pin the method

     // down and prevent it from being collectible if and when it

     // finishes executing.

     return true;

   }

   if (mark()->should_not_be_cached()) {

     // It is either not safe or not a good idea to cache this

     // method at this time because of the state of the embedded

     // markOop. See markOop.cpp for the gory details.

     return true;

   }

   // caching this method should be just fine

   return false;

 }

 // Constant pool structure for invoke methods:

 enum {

   _imcp_invoke_name = 1,        // utf8: 'invoke'

   _imcp_invoke_signature,       // utf8: (variable symbolOop)

   _imcp_method_type_value,      // string: (variable java/dyn/MethodType, sic)

   _imcp_limit

 };

 oop methodOopDesc::method_handle_type() const {

   if (!is_method_handle_invoke()) { assert(false, "caller resp."); return NULL; }

   oop mt = constants()->resolved_string_at(_imcp_method_type_value);

   assert(mt->klass() == SystemDictionary::MethodType_klass(), "");

   return mt;

 }

 jint* methodOopDesc::method_type_offsets_chain() {

   static jint pchase[] = { -1, -1, -1 };

   if (pchase[0] == -1) {

     jint step0 = in_bytes(constants_offset());

     jint step1 = (constantPoolOopDesc::header_size() + _imcp_method_type_value) * HeapWordSize;

     // do this in reverse to avoid races:

     OrderAccess::release_store(&pchase[1], step1);

     OrderAccess::release_store(&pchase[0], step0);

   }

   return pchase;

 }

 methodHandle methodOopDesc::make_invoke_method(KlassHandle holder,

                                                symbolHandle signature,

                                                Handle method_type, TRAPS) {

   methodHandle empty;

   assert(holder() == SystemDictionary::MethodHandle_klass(),

          "must be a JSR 292 magic type");

   if (TraceMethodHandles) {

     tty->print("Creating invoke method for ");

     signature->print_value();

     tty->cr();

   }

   constantPoolHandle cp;

   {

     constantPoolOop cp_oop = oopFactory::new_constantPool(_imcp_limit, IsSafeConc, CHECK_(empty));

     cp = constantPoolHandle(THREAD, cp_oop);

   }

   cp->symbol_at_put(_imcp_invoke_name,       vmSymbols::invoke_name());

   cp->symbol_at_put(_imcp_invoke_signature,  signature());

   cp->string_at_put(_imcp_method_type_value, vmSymbols::void_signature());

   cp->set_pool_holder(holder());

   // set up the fancy stuff:

   cp->pseudo_string_at_put(_imcp_method_type_value, method_type());

   methodHandle m;

   {

     int flags_bits = (JVM_MH_INVOKE_BITS | JVM_ACC_PUBLIC | JVM_ACC_FINAL);

     methodOop m_oop = oopFactory::new_method(0, accessFlags_from(flags_bits),

                                              0, 0, 0, IsSafeConc, CHECK_(empty));

     m = methodHandle(THREAD, m_oop);

   }

   m->set_constants(cp());

   m->set_name_index(_imcp_invoke_name);

   m->set_signature_index(_imcp_invoke_signature);

   assert(m->name() == vmSymbols::invoke_name(), "");

   assert(m->signature() == signature(), "");

 #ifdef CC_INTERP

   ResultTypeFinder rtf(signature());

   m->set_result_index(rtf.type());

 #endif

   m->compute_size_of_parameters(THREAD);

   m->set_exception_table(Universe::the_empty_int_array());

   // Finally, set up its entry points.

   assert(m->method_handle_type() == method_type(), "");

   assert(m->can_be_statically_bound(), "");

   m->set_vtable_index(methodOopDesc::nonvirtual_vtable_index);

   m->link_method(m, CHECK_(empty));

 #ifdef ASSERT

   // Make sure the pointer chase works.

   address p = (address) m();

   for (jint* pchase = method_type_offsets_chain(); (*pchase) != -1; pchase++) {

     p = *(address*)(p + (*pchase));

   }

   assert((oop)p == method_type(), "pointer chase is correct");

 #endif

   if (TraceMethodHandles && (Verbose || WizardMode))

     m->print_on(tty);

   return m;

 }

 methodHandle methodOopDesc:: clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,

                                                 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {

   // Code below does not work for native methods - they should never get rewritten anyway

   assert(!m->is_native(), "cannot rewrite native methods");

   // Allocate new methodOop

   AccessFlags flags = m->access_flags();

   int checked_exceptions_len = m->checked_exceptions_length();

   int localvariable_len = m->localvariable_table_length();

   // Allocate newm_oop with the is_conc_safe parameter set

   // to IsUnsafeConc to indicate that newm_oop is not yet

   // safe for concurrent processing by a GC.

   methodOop newm_oop = oopFactory::new_method(new_code_length,

                                               flags,

                                               new_compressed_linenumber_size,

                                               localvariable_len,

                                               checked_exceptions_len,

                                               IsUnsafeConc,

                                               CHECK_(methodHandle()));

   methodHandle newm (THREAD, newm_oop);

   int new_method_size = newm->method_size();

   // Create a shallow copy of methodOopDesc part, but be careful to preserve the new constMethodOop

   constMethodOop newcm = newm->constMethod();

   int new_const_method_size = newm->constMethod()->object_size();

   memcpy(newm(), m(), sizeof(methodOopDesc));

   // Create shallow copy of constMethodOopDesc, but be careful to preserve the methodOop

   // is_conc_safe is set to false because that is the value of

   // is_conc_safe initialzied into newcm and the copy should

   // not overwrite that value.  During the window during which it is

   // tagged as unsafe, some extra work could be needed during precleaning

   // or concurrent marking but those phases will be correct.  Setting and

   // resetting is done in preference to a careful copying into newcm to

   // avoid having to know the precise layout of a constMethodOop.

   m->constMethod()->set_is_conc_safe(false);

   memcpy(newcm, m->constMethod(), sizeof(constMethodOopDesc));

   m->constMethod()->set_is_conc_safe(true);

   // Reset correct method/const method, method size, and parameter info

   newcm->set_method(newm());

   newm->set_constMethod(newcm);

   assert(newcm->method() == newm(), "check");

   newm->constMethod()->set_code_size(new_code_length);

   newm->constMethod()->set_constMethod_size(new_const_method_size);

   newm->set_method_size(new_method_size);

   assert(newm->code_size() == new_code_length, "check");

   assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");

   assert(newm->localvariable_table_length() == localvariable_len, "check");

   // Copy new byte codes

   memcpy(newm->code_base(), new_code, new_code_length);

   // Copy line number table

   if (new_compressed_linenumber_size > 0) {

     memcpy(newm->compressed_linenumber_table(),

            new_compressed_linenumber_table,

            new_compressed_linenumber_size);

   }

   // Copy checked_exceptions

   if (checked_exceptions_len > 0) {

     memcpy(newm->checked_exceptions_start(),

            m->checked_exceptions_start(),

            checked_exceptions_len * sizeof(CheckedExceptionElement));

   }

   // Copy local variable number table

   if (localvariable_len > 0) {

     memcpy(newm->localvariable_table_start(),

            m->localvariable_table_start(),

            localvariable_len * sizeof(LocalVariableTableElement));

   }

   // Only set is_conc_safe to true when changes to newcm are

   // complete.

   newcm->set_is_conc_safe(true);

   return newm;

 }

 vmSymbols::SID methodOopDesc::klass_id_for_intrinsics(klassOop holder) {

   // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics

   // because we are not loading from core libraries

   if (instanceKlass::cast(holder)->class_loader() != NULL)

     return vmSymbols::NO_SID;   // regardless of name, no intrinsics here

   // see if the klass name is well-known:

   symbolOop klass_name = instanceKlass::cast(holder)->name();

   return vmSymbols::find_sid(klass_name);

 }

 void methodOopDesc::init_intrinsic_id() {

   assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");

   const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));

   assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");

   // the klass name is well-known:

   vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());

   assert(klass_id != vmSymbols::NO_SID, "caller responsibility");

   // ditto for method and signature:

   vmSymbols::SID  name_id = vmSymbols::find_sid(name());

   if (name_id  == vmSymbols::NO_SID)  return;

   vmSymbols::SID   sig_id = vmSymbols::find_sid(signature());

   if (sig_id   == vmSymbols::NO_SID)  return;

   jshort flags = access_flags().as_short();

   vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);

   if (id != vmIntrinsics::_none) {

     set_intrinsic_id(id);

     return;

   }

   // A few slightly irregular cases:

   switch (klass_id) {

   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):

     // Second chance: check in regular Math.

     switch (name_id) {

     case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):

     case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):

     case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):

       // pretend it is the corresponding method in the non-strict class:

       klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);

       id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);

       break;

     }

   }

   if (id != vmIntrinsics::_none) {

     // Set up its iid.  It is an alias method.

     set_intrinsic_id(id);

     return;

   }

 }

 // These two methods are static since a GC may move the methodOopDesc

 bool methodOopDesc::load_signature_classes(methodHandle m, TRAPS) {

   bool sig_is_loaded = true;

   Handle class_loader(THREAD, instanceKlass::cast(m->method_holder())->class_loader());

   Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain());

   symbolHandle signature(THREAD, m->signature());

   for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {

     if (ss.is_object()) {

       symbolOop sym = ss.as_symbol(CHECK_(false));

       symbolHandle name (THREAD, sym);

       klassOop klass = SystemDictionary::resolve_or_null(name, class_loader,

                                              protection_domain, THREAD);

       // We are loading classes eagerly. If a ClassNotFoundException or

       // a LinkageError was generated, be sure to ignore it.

       if (HAS_PENDING_EXCEPTION) {

         if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||

             PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {

           CLEAR_PENDING_EXCEPTION;

         } else {

           return false;

         }

       }

       if( klass == NULL) { sig_is_loaded = false; }

     }

   }

   return sig_is_loaded;

 }

 bool methodOopDesc::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {

   Handle class_loader(THREAD, instanceKlass::cast(m->method_holder())->class_loader());

   Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain());

   symbolHandle signature(THREAD, m->signature());

   for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {

     if (ss.type() == T_OBJECT) {

       symbolHandle name(THREAD, ss.as_symbol_or_null());

       if (name() == NULL) return true;

       klassOop klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);

       if (klass == NULL) return true;

     }

   }

   return false;

 }

 // Exposed so field engineers can debug VM

 void methodOopDesc::print_short_name(outputStream* st) {

   ResourceMark rm;

 #ifdef PRODUCT

   st->print(" %s::", method_holder()->klass_part()->external_name());

 #else

   st->print(" %s::", method_holder()->klass_part()->internal_name());

 #endif

   name()->print_symbol_on(st);

   if (WizardMode) signature()->print_symbol_on(st);

 }

 extern "C" {

   static int method_compare(methodOop* a, methodOop* b) {

     return (*a)->name()->fast_compare((*b)->name());

   }

   // Prevent qsort from reordering a previous valid sort by

   // considering the address of the methodOops if two methods

   // would otherwise compare as equal.  Required to preserve

   // optimal access order in the shared archive.  Slower than

   // method_compare, only used for shared archive creation.

   static int method_compare_idempotent(methodOop* a, methodOop* b) {

     int i = method_compare(a, b);

     if (i != 0) return i;

     return ( a < b ? -1 : (a == b ? 0 : 1));

   }

   typedef int (*compareFn)(const void*, const void*);

 }

 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array

 static void reorder_based_on_method_index(objArrayOop methods,

                                           objArrayOop annotations,

                                           GrowableArray<oop>* temp_array) {

   if (annotations == NULL) {

     return;

   }

   int length = methods->length();

   int i;

   // Copy to temp array

   temp_array->clear();

   for (i = 0; i < length; i++) {

     temp_array->append(annotations->obj_at(i));

   }

   // Copy back using old method indices

   for (i = 0; i < length; i++) {

     methodOop m = (methodOop) methods->obj_at(i);

     annotations->obj_at_put(i, temp_array->at(m->method_idnum()));

   }

 }

 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array

 void methodOopDesc::sort_methods(objArrayOop methods,

                                  objArrayOop methods_annotations,

                                  objArrayOop methods_parameter_annotations,

                                  objArrayOop methods_default_annotations,

                                  bool idempotent) {

   int length = methods->length();

   if (length > 1) {

     bool do_annotations = false;

     if (methods_annotations != NULL ||

         methods_parameter_annotations != NULL ||

         methods_default_annotations != NULL) {

       do_annotations = true;

     }

     if (do_annotations) {

       // Remember current method ordering so we can reorder annotations

       for (int i = 0; i < length; i++) {

         methodOop m = (methodOop) methods->obj_at(i);

         m->set_method_idnum(i);

       }

     }

     // Use a simple bubble sort for small number of methods since

     // qsort requires a functional pointer call for each comparison.

     if (UseCompressedOops || length < 8) {

       bool sorted = true;

       for (int i=length-1; i>0; i--) {

         for (int j=0; j<i; j++) {

           methodOop m1 = (methodOop)methods->obj_at(j);

           methodOop m2 = (methodOop)methods->obj_at(j+1);

           if ((uintptr_t)m1->name() > (uintptr_t)m2->name()) {

             methods->obj_at_put(j, m2);

             methods->obj_at_put(j+1, m1);

             sorted = false;

           }

         }

         if (sorted) break;

           sorted = true;

       }

     } else {

       // XXX This doesn't work for UseCompressedOops because the compare fn

       // will have to decode the methodOop anyway making it not much faster

       // than above.

       compareFn compare = (compareFn) (idempotent ? method_compare_idempotent : method_compare);

       qsort(methods->base(), length, heapOopSize, compare);

     }

     // Sort annotations if necessary

     assert(methods_annotations == NULL           || methods_annotations->length() == methods->length(), "");

     assert(methods_parameter_annotations == NULL || methods_parameter_annotations->length() == methods->length(), "");

     assert(methods_default_annotations == NULL   || methods_default_annotations->length() == methods->length(), "");

     if (do_annotations) {

       ResourceMark rm;

       // Allocate temporary storage

       GrowableArray<oop>* temp_array = new GrowableArray<oop>(length);

       reorder_based_on_method_index(methods, methods_annotations, temp_array);

       reorder_based_on_method_index(methods, methods_parameter_annotations, temp_array);

       reorder_based_on_method_index(methods, methods_default_annotations, temp_array);

     }

     // Reset method ordering

     for (int i = 0; i < length; i++) {

       methodOop m = (methodOop) methods->obj_at(i);

       m->set_method_idnum(i);

     }

   }

 }

 //-----------------------------------------------------------------------------------

 // Non-product code

 #ifndef PRODUCT

 class SignatureTypePrinter : public SignatureTypeNames {

  private:

   outputStream* _st;

   bool _use_separator;

   void type_name(const char* name) {

     if (_use_separator) _st->print(", ");

     _st->print(name);

     _use_separator = true;

   }

  public:

   SignatureTypePrinter(symbolHandle signature, outputStream* st) : SignatureTypeNames(signature) {

     _st = st;

     _use_separator = false;

   }

   void print_parameters()              { _use_separator = false; iterate_parameters(); }

   void print_returntype()              { _use_separator = false; iterate_returntype(); }

 };

 void methodOopDesc::print_name(outputStream* st) {

   Thread *thread = Thread::current();

   ResourceMark rm(thread);

   SignatureTypePrinter sig(signature(), st);

   st->print("%s ", is_static() ? "static" : "virtual");

   sig.print_returntype();

   st->print(" %s.", method_holder()->klass_part()->internal_name());

   name()->print_symbol_on(st);

   st->print("(");

   sig.print_parameters();

   st->print(")");

 }

 void methodOopDesc::print_codes_on(outputStream* st) const {

   print_codes_on(0, code_size(), st);

 }

 void methodOopDesc::print_codes_on(int from, int to, outputStream* st) const {

   Thread *thread = Thread::current();

   ResourceMark rm(thread);

   methodHandle mh (thread, (methodOop)this);

   BytecodeStream s(mh);

   s.set_interval(from, to);

   BytecodeTracer::set_closure(BytecodeTracer::std_closure());

   while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);

 }

 #endif // not PRODUCT

 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas

 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)

 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used

 // as end-of-stream terminator.

 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {

   // bci and line number does not compress into single byte.

   // Write out escape character and use regular compression for bci and line number.

   write_byte((jubyte)0xFF);

   write_signed_int(bci_delta);

   write_signed_int(line_delta);

 }

 // See comment in methodOop.hpp which explains why this exists.

 #if defined(_M_AMD64) && MSC_VER >= 1400

 #pragma optimize("", off)

 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {

   write_pair_inline(bci, line);

 }

 #pragma optimize("", on)

 #endif

 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {

   _bci = 0;

   _line = 0;

 };

 bool CompressedLineNumberReadStream::read_pair() {

   jubyte next = read_byte();

   // Check for terminator

   if (next == 0) return false;

   if (next == 0xFF) {

     // Escape character, regular compression used

     _bci  += read_signed_int();

     _line += read_signed_int();

   } else {

     // Single byte compression used

     _bci  += next >> 3;

     _line += next & 0x7;

   }

   return true;

 }

 Bytecodes::Code methodOopDesc::orig_bytecode_at(int bci) {

   BreakpointInfo* bp = instanceKlass::cast(method_holder())->breakpoints();

   for (; bp != NULL; bp = bp->next()) {

     if (bp->match(this, bci)) {

       return bp->orig_bytecode();

     }

   }

   ShouldNotReachHere();

   return Bytecodes::_shouldnotreachhere;

 }

 void methodOopDesc::set_orig_bytecode_at(int bci, Bytecodes::Code code) {

   assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");

   BreakpointInfo* bp = instanceKlass::cast(method_holder())->breakpoints();

   for (; bp != NULL; bp = bp->next()) {

     if (bp->match(this, bci)) {

       bp->set_orig_bytecode(code);

       // and continue, in case there is more than one

     }

   }

 }

 void methodOopDesc::set_breakpoint(int bci) {

   instanceKlass* ik = instanceKlass::cast(method_holder());

   BreakpointInfo *bp = new BreakpointInfo(this, bci);

   bp->set_next(ik->breakpoints());

   ik->set_breakpoints(bp);

   // do this last:

   bp->set(this);

 }

 static void clear_matches(methodOop m, int bci) {

   instanceKlass* ik = instanceKlass::cast(m->method_holder());

   BreakpointInfo* prev_bp = NULL;

   BreakpointInfo* next_bp;

   for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {

     next_bp = bp->next();

     // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).

     if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {

       // do this first:

       bp->clear(m);

       // unhook it

       if (prev_bp != NULL)

         prev_bp->set_next(next_bp);

       else

         ik->set_breakpoints(next_bp);

       delete bp;

       // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods

       // at same location. So we have multiple matching (method_index and bci)

       // BreakpointInfo nodes in BreakpointInfo list. We should just delete one

       // breakpoint for clear_breakpoint request and keep all other method versions

       // BreakpointInfo for future clear_breakpoint request.

       // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)

       // which is being called when class is unloaded. We delete all the Breakpoint

       // information for all versions of method. We may not correctly restore the original

       // bytecode in all method versions, but that is ok. Because the class is being unloaded

       // so these methods won't be used anymore.

       if (bci >= 0) {

         break;

       }

     } else {

       // This one is a keeper.

       prev_bp = bp;

     }

   }

 }

 void methodOopDesc::clear_breakpoint(int bci) {

   assert(bci >= 0, "");

   clear_matches(this, bci);

 }

 void methodOopDesc::clear_all_breakpoints() {

   clear_matches(this, -1);

 }

 BreakpointInfo::BreakpointInfo(methodOop m, int bci) {

   _bci = bci;

   _name_index = m->name_index();

   _signature_index = m->signature_index();

   _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);

   if (_orig_bytecode == Bytecodes::_breakpoint)

     _orig_bytecode = m->orig_bytecode_at(_bci);

   _next = NULL;

 }

 void BreakpointInfo::set(methodOop method) {

 #ifdef ASSERT

   {

     Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);

     if (code == Bytecodes::_breakpoint)

       code = method->orig_bytecode_at(_bci);

     assert(orig_bytecode() == code, "original bytecode must be the same");

   }

 #endif

   *method->bcp_from(_bci) = Bytecodes::_breakpoint;

   method->incr_number_of_breakpoints();

   SystemDictionary::notice_modification();

   {

     // Deoptimize all dependents on this method

     Thread *thread = Thread::current();

     HandleMark hm(thread);

     methodHandle mh(thread, method);

     Universe::flush_dependents_on_method(mh);

   }

 }

 void BreakpointInfo::clear(methodOop method) {

   *method->bcp_from(_bci) = orig_bytecode();

   assert(method->number_of_breakpoints() > 0, "must not go negative");

   method->decr_number_of_breakpoints();

 }