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

 /*

  * Copyright (c) 2000, 2014, 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 "classfile/systemDictionary.hpp"

 #include "compiler/compilerOracle.hpp"

 #include "interpreter/bytecode.hpp"

 #include "interpreter/bytecodeStream.hpp"

 #include "interpreter/linkResolver.hpp"

 #include "memory/heapInspection.hpp"

 #include "oops/methodData.hpp"

 #include "prims/jvmtiRedefineClasses.hpp"

 #include "runtime/compilationPolicy.hpp"

 #include "runtime/deoptimization.hpp"

 #include "runtime/handles.inline.hpp"

 #include "runtime/orderAccess.inline.hpp"

 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC

 // ==================================================================

 // DataLayout

 //

 // Overlay for generic profiling data.

 // Some types of data layouts need a length field.

 bool DataLayout::needs_array_len(u1 tag) {

   return (tag == multi_branch_data_tag) || (tag == arg_info_data_tag) || (tag == parameters_type_data_tag);

 }

 // Perform generic initialization of the data.  More specific

 // initialization occurs in overrides of ProfileData::post_initialize.

 void DataLayout::initialize(u1 tag, u2 bci, int cell_count) {

   _header._bits = (intptr_t)0;

   _header._struct._tag = tag;

   _header._struct._bci = bci;

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

     set_cell_at(i, (intptr_t)0);

   }

   if (needs_array_len(tag)) {

     set_cell_at(ArrayData::array_len_off_set, cell_count - 1); // -1 for header.

   }

   if (tag == call_type_data_tag) {

     CallTypeData::initialize(this, cell_count);

   } else if (tag == virtual_call_type_data_tag) {

     VirtualCallTypeData::initialize(this, cell_count);

   }

 }

 void DataLayout::clean_weak_klass_links(BoolObjectClosure* cl) {

   ResourceMark m;

   data_in()->clean_weak_klass_links(cl);

 }

 // ==================================================================

 // ProfileData

 //

 // A ProfileData object is created to refer to a section of profiling

 // data in a structured way.

 // Constructor for invalid ProfileData.

 ProfileData::ProfileData() {

   _data = NULL;

 }

 char* ProfileData::print_data_on_helper(const MethodData* md) const {

   DataLayout* dp  = md->extra_data_base();

   DataLayout* end = md->extra_data_limit();

   stringStream ss;

   for (;; dp = MethodData::next_extra(dp)) {

     assert(dp < end, "moved past end of extra data");

     switch(dp->tag()) {

     case DataLayout::speculative_trap_data_tag:

       if (dp->bci() == bci()) {

         SpeculativeTrapData* data = new SpeculativeTrapData(dp);

         int trap = data->trap_state();

         char buf[100];

         ss.print("trap/");

         data->method()->print_short_name(&ss);

         ss.print("(%s) ", Deoptimization::format_trap_state(buf, sizeof(buf), trap));

       }

       break;

     case DataLayout::bit_data_tag:

       break;

     case DataLayout::no_tag:

     case DataLayout::arg_info_data_tag:

       return ss.as_string();

       break;

     default:

       fatal(err_msg("unexpected tag %d", dp->tag()));

     }

   }

   return NULL;

 }

 void ProfileData::print_data_on(outputStream* st, const MethodData* md) const {

   print_data_on(st, print_data_on_helper(md));

 }

 #ifndef PRODUCT

 void ProfileData::print_shared(outputStream* st, const char* name, const char* extra) const {

   st->print("bci: %d", bci());

   st->fill_to(tab_width_one);

   st->print("%s", name);

   tab(st);

   int trap = trap_state();

   if (trap != 0) {

     char buf[100];

     st->print("trap(%s) ", Deoptimization::format_trap_state(buf, sizeof(buf), trap));

   }

   if (extra != NULL) {

     st->print("%s", extra);

   }

   int flags = data()->flags();

   if (flags != 0) {

     st->print("flags(%d) ", flags);

   }

 }

 void ProfileData::tab(outputStream* st, bool first) const {

   st->fill_to(first ? tab_width_one : tab_width_two);

 }

 #endif // !PRODUCT

 // ==================================================================

 // BitData

 //

 // A BitData corresponds to a one-bit flag.  This is used to indicate

 // whether a checkcast bytecode has seen a null value.

 #ifndef PRODUCT

 void BitData::print_data_on(outputStream* st, const char* extra) const {

   print_shared(st, "BitData", extra);

 }

 #endif // !PRODUCT

 // ==================================================================

 // CounterData

 //

 // A CounterData corresponds to a simple counter.

 #ifndef PRODUCT

 void CounterData::print_data_on(outputStream* st, const char* extra) const {

   print_shared(st, "CounterData", extra);

   st->print_cr("count(%u)", count());

 }

 #endif // !PRODUCT

 // ==================================================================

 // JumpData

 //

 // A JumpData is used to access profiling information for a direct

 // branch.  It is a counter, used for counting the number of branches,

 // plus a data displacement, used for realigning the data pointer to

 // the corresponding target bci.

 void JumpData::post_initialize(BytecodeStream* stream, MethodData* mdo) {

   assert(stream->bci() == bci(), "wrong pos");

   int target;

   Bytecodes::Code c = stream->code();

   if (c == Bytecodes::_goto_w || c == Bytecodes::_jsr_w) {

     target = stream->dest_w();

   } else {

     target = stream->dest();

   }

   int my_di = mdo->dp_to_di(dp());

   int target_di = mdo->bci_to_di(target);

   int offset = target_di - my_di;

   set_displacement(offset);

 }

 #ifndef PRODUCT

 void JumpData::print_data_on(outputStream* st, const char* extra) const {

   print_shared(st, "JumpData", extra);

   st->print_cr("taken(%u) displacement(%d)", taken(), displacement());

 }

 #endif // !PRODUCT

 int TypeStackSlotEntries::compute_cell_count(Symbol* signature, bool include_receiver, int max) {

   // Parameter profiling include the receiver

   int args_count = include_receiver ? 1 : 0;

   ResourceMark rm;

   SignatureStream ss(signature);

   args_count += ss.reference_parameter_count();

   args_count = MIN2(args_count, max);

   return args_count * per_arg_cell_count;

 }

 int TypeEntriesAtCall::compute_cell_count(BytecodeStream* stream) {

   assert(Bytecodes::is_invoke(stream->code()), "should be invoke");

   assert(TypeStackSlotEntries::per_arg_count() > ReturnTypeEntry::static_cell_count(), "code to test for arguments/results broken");

   Bytecode_invoke inv(stream->method(), stream->bci());

   int args_cell = 0;

   if (arguments_profiling_enabled()) {

     args_cell = TypeStackSlotEntries::compute_cell_count(inv.signature(), false, TypeProfileArgsLimit);

   }

   int ret_cell = 0;

   if (return_profiling_enabled() && (inv.result_type() == T_OBJECT || inv.result_type() == T_ARRAY)) {

     ret_cell = ReturnTypeEntry::static_cell_count();

   }

   int header_cell = 0;

   if (args_cell + ret_cell > 0) {

     header_cell = header_cell_count();

   }

   return header_cell + args_cell + ret_cell;

 }

 class ArgumentOffsetComputer : public SignatureInfo {

 private:

   int _max;

   GrowableArray<int> _offsets;

   void set(int size, BasicType type) { _size += size; }

   void do_object(int begin, int end) {

     if (_offsets.length() < _max) {

       _offsets.push(_size);

     }

     SignatureInfo::do_object(begin, end);

   }

   void do_array (int begin, int end) {

     if (_offsets.length() < _max) {

       _offsets.push(_size);

     }

     SignatureInfo::do_array(begin, end);

   }

 public:

   ArgumentOffsetComputer(Symbol* signature, int max)

     : SignatureInfo(signature), _max(max), _offsets(Thread::current(), max) {

   }

   int total() { lazy_iterate_parameters(); return _size; }

   int off_at(int i) const { return _offsets.at(i); }

 };

 void TypeStackSlotEntries::post_initialize(Symbol* signature, bool has_receiver, bool include_receiver) {

   ResourceMark rm;

   int start = 0;

   // Parameter profiling include the receiver

   if (include_receiver && has_receiver) {

     set_stack_slot(0, 0);

     set_type(0, type_none());

     start += 1;

   }

   ArgumentOffsetComputer aos(signature, _number_of_entries-start);

   aos.total();

   for (int i = start; i < _number_of_entries; i++) {

     set_stack_slot(i, aos.off_at(i-start) + (has_receiver ? 1 : 0));

     set_type(i, type_none());

   }

 }

 void CallTypeData::post_initialize(BytecodeStream* stream, MethodData* mdo) {

   assert(Bytecodes::is_invoke(stream->code()), "should be invoke");

   Bytecode_invoke inv(stream->method(), stream->bci());

   SignatureStream ss(inv.signature());

   if (has_arguments()) {

 #ifdef ASSERT

     ResourceMark rm;

     int count = MIN2(ss.reference_parameter_count(), (int)TypeProfileArgsLimit);

     assert(count > 0, "room for args type but none found?");

     check_number_of_arguments(count);

 #endif

     _args.post_initialize(inv.signature(), inv.has_receiver(), false);

   }

   if (has_return()) {

     assert(inv.result_type() == T_OBJECT || inv.result_type() == T_ARRAY, "room for a ret type but doesn't return obj?");

     _ret.post_initialize();

   }

 }

 void VirtualCallTypeData::post_initialize(BytecodeStream* stream, MethodData* mdo) {

   assert(Bytecodes::is_invoke(stream->code()), "should be invoke");

   Bytecode_invoke inv(stream->method(), stream->bci());

   if (has_arguments()) {

 #ifdef ASSERT

     ResourceMark rm;

     SignatureStream ss(inv.signature());

     int count = MIN2(ss.reference_parameter_count(), (int)TypeProfileArgsLimit);

     assert(count > 0, "room for args type but none found?");

     check_number_of_arguments(count);

 #endif

     _args.post_initialize(inv.signature(), inv.has_receiver(), false);

   }

   if (has_return()) {

     assert(inv.result_type() == T_OBJECT || inv.result_type() == T_ARRAY, "room for a ret type but doesn't return obj?");

     _ret.post_initialize();

   }

 }

 bool TypeEntries::is_loader_alive(BoolObjectClosure* is_alive_cl, intptr_t p) {

   Klass* k = (Klass*)klass_part(p);

   return k != NULL && k->is_loader_alive(is_alive_cl);

 }

 void TypeStackSlotEntries::clean_weak_klass_links(BoolObjectClosure* is_alive_cl) {

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

     intptr_t p = type(i);

     if (!is_loader_alive(is_alive_cl, p)) {

       set_type(i, with_status((Klass*)NULL, p));

     }

   }

 }

 void ReturnTypeEntry::clean_weak_klass_links(BoolObjectClosure* is_alive_cl) {

   intptr_t p = type();

   if (!is_loader_alive(is_alive_cl, p)) {

     set_type(with_status((Klass*)NULL, p));

   }

 }

 bool TypeEntriesAtCall::return_profiling_enabled() {

   return MethodData::profile_return();

 }

 bool TypeEntriesAtCall::arguments_profiling_enabled() {

   return MethodData::profile_arguments();

 }

 #ifndef PRODUCT

 void TypeEntries::print_klass(outputStream* st, intptr_t k) {

   if (is_type_none(k)) {

     st->print("none");

   } else if (is_type_unknown(k)) {

     st->print("unknown");

   } else {

     valid_klass(k)->print_value_on(st);

   }

   if (was_null_seen(k)) {

     st->print(" (null seen)");

   }

 }

 void TypeStackSlotEntries::print_data_on(outputStream* st) const {

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

     _pd->tab(st);

     st->print("%d: stack(%u) ", i, stack_slot(i));

     print_klass(st, type(i));

     st->cr();

   }

 }

 void ReturnTypeEntry::print_data_on(outputStream* st) const {

   _pd->tab(st);

   print_klass(st, type());

   st->cr();

 }

 void CallTypeData::print_data_on(outputStream* st, const char* extra) const {

   CounterData::print_data_on(st, extra);

   if (has_arguments()) {

     tab(st, true);

     st->print("argument types");

     _args.print_data_on(st);

   }

   if (has_return()) {

     tab(st, true);

     st->print("return type");

     _ret.print_data_on(st);

   }

 }

 void VirtualCallTypeData::print_data_on(outputStream* st, const char* extra) const {

   VirtualCallData::print_data_on(st, extra);

   if (has_arguments()) {

     tab(st, true);

     st->print("argument types");

     _args.print_data_on(st);

   }

   if (has_return()) {

     tab(st, true);

     st->print("return type");

     _ret.print_data_on(st);

   }

 }

 #endif

 // ==================================================================

 // ReceiverTypeData

 //

 // A ReceiverTypeData is used to access profiling information about a

 // dynamic type check.  It consists of a counter which counts the total times

 // that the check is reached, and a series of (Klass*, count) pairs

 // which are used to store a type profile for the receiver of the check.

 void ReceiverTypeData::clean_weak_klass_links(BoolObjectClosure* is_alive_cl) {

     for (uint row = 0; row < row_limit(); row++) {

     Klass* p = receiver(row);

     if (p != NULL && !p->is_loader_alive(is_alive_cl)) {

       clear_row(row);

     }

   }

 }

 #ifndef PRODUCT

 void ReceiverTypeData::print_receiver_data_on(outputStream* st) const {

   uint row;

   int entries = 0;

   for (row = 0; row < row_limit(); row++) {

     if (receiver(row) != NULL)  entries++;

   }

   st->print_cr("count(%u) entries(%u)", count(), entries);

   int total = count();

   for (row = 0; row < row_limit(); row++) {

     if (receiver(row) != NULL) {

       total += receiver_count(row);

     }

   }

   for (row = 0; row < row_limit(); row++) {

     if (receiver(row) != NULL) {

       tab(st);

       receiver(row)->print_value_on(st);

       st->print_cr("(%u %4.2f)", receiver_count(row), (float) receiver_count(row) / (float) total);

     }

   }

 }

 void ReceiverTypeData::print_data_on(outputStream* st, const char* extra) const {

   print_shared(st, "ReceiverTypeData", extra);

   print_receiver_data_on(st);

 }

 void VirtualCallData::print_data_on(outputStream* st, const char* extra) const {

   print_shared(st, "VirtualCallData", extra);

   print_receiver_data_on(st);

 }

 #endif // !PRODUCT

 // ==================================================================

 // RetData

 //

 // A RetData is used to access profiling information for a ret bytecode.

 // It is composed of a count of the number of times that the ret has

 // been executed, followed by a series of triples of the form

 // (bci, count, di) which count the number of times that some bci was the

 // target of the ret and cache a corresponding displacement.

 void RetData::post_initialize(BytecodeStream* stream, MethodData* mdo) {

   for (uint row = 0; row < row_limit(); row++) {

     set_bci_displacement(row, -1);

     set_bci(row, no_bci);

   }

   // release so other threads see a consistent state.  bci is used as

   // a valid flag for bci_displacement.

   OrderAccess::release();

 }

 // This routine needs to atomically update the RetData structure, so the

 // caller needs to hold the RetData_lock before it gets here.  Since taking

 // the lock can block (and allow GC) and since RetData is a ProfileData is a

 // wrapper around a derived oop, taking the lock in _this_ method will

 // basically cause the 'this' pointer's _data field to contain junk after the

 // lock.  We require the caller to take the lock before making the ProfileData

 // structure.  Currently the only caller is InterpreterRuntime::update_mdp_for_ret

 address RetData::fixup_ret(int return_bci, MethodData* h_mdo) {

   // First find the mdp which corresponds to the return bci.

   address mdp = h_mdo->bci_to_dp(return_bci);

   // Now check to see if any of the cache slots are open.

   for (uint row = 0; row < row_limit(); row++) {

     if (bci(row) == no_bci) {

       set_bci_displacement(row, mdp - dp());

       set_bci_count(row, DataLayout::counter_increment);

       // Barrier to ensure displacement is written before the bci; allows

       // the interpreter to read displacement without fear of race condition.

       release_set_bci(row, return_bci);

       break;

     }

   }

   return mdp;

 }

 #ifdef CC_INTERP

 DataLayout* RetData::advance(MethodData *md, int bci) {

   return (DataLayout*) md->bci_to_dp(bci);

 }

 #endif // CC_INTERP

 #ifndef PRODUCT

 void RetData::print_data_on(outputStream* st, const char* extra) const {

   print_shared(st, "RetData", extra);

   uint row;

   int entries = 0;

   for (row = 0; row < row_limit(); row++) {

     if (bci(row) != no_bci)  entries++;

   }

   st->print_cr("count(%u) entries(%u)", count(), entries);

   for (row = 0; row < row_limit(); row++) {

     if (bci(row) != no_bci) {

       tab(st);

       st->print_cr("bci(%d: count(%u) displacement(%d))",

                    bci(row), bci_count(row), bci_displacement(row));

     }

   }

 }

 #endif // !PRODUCT

 // ==================================================================

 // BranchData

 //

 // A BranchData is used to access profiling data for a two-way branch.

 // It consists of taken and not_taken counts as well as a data displacement

 // for the taken case.

 void BranchData::post_initialize(BytecodeStream* stream, MethodData* mdo) {

   assert(stream->bci() == bci(), "wrong pos");

   int target = stream->dest();

   int my_di = mdo->dp_to_di(dp());

   int target_di = mdo->bci_to_di(target);

   int offset = target_di - my_di;

   set_displacement(offset);

 }

 #ifndef PRODUCT

 void BranchData::print_data_on(outputStream* st, const char* extra) const {

   print_shared(st, "BranchData", extra);

   st->print_cr("taken(%u) displacement(%d)",

                taken(), displacement());

   tab(st);

   st->print_cr("not taken(%u)", not_taken());

 }

 #endif

 // ==================================================================

 // MultiBranchData

 //

 // A MultiBranchData is used to access profiling information for

 // a multi-way branch (*switch bytecodes).  It consists of a series

 // of (count, displacement) pairs, which count the number of times each

 // case was taken and specify the data displacment for each branch target.

 int MultiBranchData::compute_cell_count(BytecodeStream* stream) {

   int cell_count = 0;

   if (stream->code() == Bytecodes::_tableswitch) {

     Bytecode_tableswitch sw(stream->method()(), stream->bcp());

     cell_count = 1 + per_case_cell_count * (1 + sw.length()); // 1 for default

   } else {

     Bytecode_lookupswitch sw(stream->method()(), stream->bcp());

     cell_count = 1 + per_case_cell_count * (sw.number_of_pairs() + 1); // 1 for default

   }

   return cell_count;

 }

 void MultiBranchData::post_initialize(BytecodeStream* stream,

                                       MethodData* mdo) {

   assert(stream->bci() == bci(), "wrong pos");

   int target;

   int my_di;

   int target_di;

   int offset;

   if (stream->code() == Bytecodes::_tableswitch) {

     Bytecode_tableswitch sw(stream->method()(), stream->bcp());

     int len = sw.length();

     assert(array_len() == per_case_cell_count * (len + 1), "wrong len");

     for (int count = 0; count < len; count++) {

       target = sw.dest_offset_at(count) + bci();

       my_di = mdo->dp_to_di(dp());

       target_di = mdo->bci_to_di(target);

       offset = target_di - my_di;

       set_displacement_at(count, offset);

     }

     target = sw.default_offset() + bci();

     my_di = mdo->dp_to_di(dp());

     target_di = mdo->bci_to_di(target);

     offset = target_di - my_di;

     set_default_displacement(offset);

   } else {

     Bytecode_lookupswitch sw(stream->method()(), stream->bcp());

     int npairs = sw.number_of_pairs();

     assert(array_len() == per_case_cell_count * (npairs + 1), "wrong len");

     for (int count = 0; count < npairs; count++) {

       LookupswitchPair pair = sw.pair_at(count);

       target = pair.offset() + bci();

       my_di = mdo->dp_to_di(dp());

       target_di = mdo->bci_to_di(target);

       offset = target_di - my_di;

       set_displacement_at(count, offset);

     }

     target = sw.default_offset() + bci();

     my_di = mdo->dp_to_di(dp());

     target_di = mdo->bci_to_di(target);

     offset = target_di - my_di;

     set_default_displacement(offset);

   }

 }

 #ifndef PRODUCT

 void MultiBranchData::print_data_on(outputStream* st, const char* extra) const {

   print_shared(st, "MultiBranchData", extra);

   st->print_cr("default_count(%u) displacement(%d)",

                default_count(), default_displacement());

   int cases = number_of_cases();

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

     tab(st);

     st->print_cr("count(%u) displacement(%d)",

                  count_at(i), displacement_at(i));

   }

 }

 #endif

 #ifndef PRODUCT

 void ArgInfoData::print_data_on(outputStream* st, const char* extra) const {

   print_shared(st, "ArgInfoData", extra);

   int nargs = number_of_args();

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

     st->print("  0x%x", arg_modified(i));

   }

   st->cr();

 }

 #endif

 int ParametersTypeData::compute_cell_count(Method* m) {

   if (!MethodData::profile_parameters_for_method(m)) {

     return 0;

   }

   int max = TypeProfileParmsLimit == -1 ? INT_MAX : TypeProfileParmsLimit;

   int obj_args = TypeStackSlotEntries::compute_cell_count(m->signature(), !m->is_static(), max);

   if (obj_args > 0) {

     return obj_args + 1; // 1 cell for array len

   }

   return 0;

 }

 void ParametersTypeData::post_initialize(BytecodeStream* stream, MethodData* mdo) {

   _parameters.post_initialize(mdo->method()->signature(), !mdo->method()->is_static(), true);

 }

 bool ParametersTypeData::profiling_enabled() {

   return MethodData::profile_parameters();

 }

 #ifndef PRODUCT

 void ParametersTypeData::print_data_on(outputStream* st, const char* extra) const {

   st->print("parameter types"); // FIXME extra ignored?

   _parameters.print_data_on(st);

 }

 void SpeculativeTrapData::print_data_on(outputStream* st, const char* extra) const {

   print_shared(st, "SpeculativeTrapData", extra);

   tab(st);

   method()->print_short_name(st);

   st->cr();

 }

 #endif

 // ==================================================================

 // MethodData*

 //

 // A MethodData* holds information which has been collected about

 // a method.

 MethodData* MethodData::allocate(ClassLoaderData* loader_data, methodHandle method, TRAPS) {

   int size = MethodData::compute_allocation_size_in_words(method);

   return new (loader_data, size, false, MetaspaceObj::MethodDataType, THREAD)

     MethodData(method(), size, CHECK_NULL);

 }

 int MethodData::bytecode_cell_count(Bytecodes::Code code) {

 #if defined(COMPILER1) && !defined(COMPILER2)

   return no_profile_data;

 #else

   switch (code) {

   case Bytecodes::_checkcast:

   case Bytecodes::_instanceof:

   case Bytecodes::_aastore:

     if (TypeProfileCasts) {

       return ReceiverTypeData::static_cell_count();

     } else {

       return BitData::static_cell_count();

     }

   case Bytecodes::_invokespecial:

   case Bytecodes::_invokestatic:

     if (MethodData::profile_arguments() || MethodData::profile_return()) {

       return variable_cell_count;

     } else {

       return CounterData::static_cell_count();

     }

   case Bytecodes::_goto:

   case Bytecodes::_goto_w:

   case Bytecodes::_jsr:

   case Bytecodes::_jsr_w:

     return JumpData::static_cell_count();

   case Bytecodes::_invokevirtual:

   case Bytecodes::_invokeinterface:

     if (MethodData::profile_arguments() || MethodData::profile_return()) {

       return variable_cell_count;

     } else {

       return VirtualCallData::static_cell_count();

     }

   case Bytecodes::_invokedynamic:

     if (MethodData::profile_arguments() || MethodData::profile_return()) {

       return variable_cell_count;

     } else {

       return CounterData::static_cell_count();

     }

   case Bytecodes::_ret:

     return RetData::static_cell_count();

   case Bytecodes::_ifeq:

   case Bytecodes::_ifne:

   case Bytecodes::_iflt:

   case Bytecodes::_ifge:

   case Bytecodes::_ifgt:

   case Bytecodes::_ifle:

   case Bytecodes::_if_icmpeq:

   case Bytecodes::_if_icmpne:

   case Bytecodes::_if_icmplt:

   case Bytecodes::_if_icmpge:

   case Bytecodes::_if_icmpgt:

   case Bytecodes::_if_icmple:

   case Bytecodes::_if_acmpeq:

   case Bytecodes::_if_acmpne:

   case Bytecodes::_ifnull:

   case Bytecodes::_ifnonnull:

     return BranchData::static_cell_count();

   case Bytecodes::_lookupswitch:

   case Bytecodes::_tableswitch:

     return variable_cell_count;

   }

   return no_profile_data;

 #endif

 }

 // Compute the size of the profiling information corresponding to

 // the current bytecode.

 int MethodData::compute_data_size(BytecodeStream* stream) {

   int cell_count = bytecode_cell_count(stream->code());

   if (cell_count == no_profile_data) {

     return 0;

   }

   if (cell_count == variable_cell_count) {

     switch (stream->code()) {

     case Bytecodes::_lookupswitch:

     case Bytecodes::_tableswitch:

       cell_count = MultiBranchData::compute_cell_count(stream);

       break;

     case Bytecodes::_invokespecial:

     case Bytecodes::_invokestatic:

     case Bytecodes::_invokedynamic:

       assert(MethodData::profile_arguments() || MethodData::profile_return(), "should be collecting args profile");

       if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||

           profile_return_for_invoke(stream->method(), stream->bci())) {

         cell_count = CallTypeData::compute_cell_count(stream);

       } else {

         cell_count = CounterData::static_cell_count();

       }

       break;

     case Bytecodes::_invokevirtual:

     case Bytecodes::_invokeinterface: {

       assert(MethodData::profile_arguments() || MethodData::profile_return(), "should be collecting args profile");

       if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||

           profile_return_for_invoke(stream->method(), stream->bci())) {

         cell_count = VirtualCallTypeData::compute_cell_count(stream);

       } else {

         cell_count = VirtualCallData::static_cell_count();

       }

       break;

     }

     default:

       fatal("unexpected bytecode for var length profile data");

     }

   }

   // Note:  cell_count might be zero, meaning that there is just

   //        a DataLayout header, with no extra cells.

   assert(cell_count >= 0, "sanity");

   return DataLayout::compute_size_in_bytes(cell_count);

 }

 bool MethodData::is_speculative_trap_bytecode(Bytecodes::Code code) {

   // Bytecodes for which we may use speculation

   switch (code) {

   case Bytecodes::_checkcast:

   case Bytecodes::_instanceof:

   case Bytecodes::_aastore:

   case Bytecodes::_invokevirtual:

   case Bytecodes::_invokeinterface:

   case Bytecodes::_if_acmpeq:

   case Bytecodes::_if_acmpne:

   case Bytecodes::_invokestatic:

 #ifdef COMPILER2

     return UseTypeSpeculation;

 #endif

   default:

     return false;

   }

   return false;

 }

 int MethodData::compute_extra_data_count(int data_size, int empty_bc_count, bool needs_speculative_traps) {

   if (ProfileTraps) {

     // Assume that up to 3% of BCIs with no MDP will need to allocate one.

     int extra_data_count = (uint)(empty_bc_count * 3) / 128 + 1;

     // If the method is large, let the extra BCIs grow numerous (to ~1%).

     int one_percent_of_data

       = (uint)data_size / (DataLayout::header_size_in_bytes()*128);

     if (extra_data_count < one_percent_of_data)

       extra_data_count = one_percent_of_data;

     if (extra_data_count > empty_bc_count)

       extra_data_count = empty_bc_count;  // no need for more

     // Make sure we have a minimum number of extra data slots to

     // allocate SpeculativeTrapData entries. We would want to have one

     // entry per compilation that inlines this method and for which

     // some type speculation assumption fails. So the room we need for

     // the SpeculativeTrapData entries doesn't directly depend on the

     // size of the method. Because it's hard to estimate, we reserve

     // space for an arbitrary number of entries.

     int spec_data_count = (needs_speculative_traps ? SpecTrapLimitExtraEntries : 0) *

       (SpeculativeTrapData::static_cell_count() + DataLayout::header_size_in_cells());

     return MAX2(extra_data_count, spec_data_count);

   } else {

     return 0;

   }

 }

 // Compute the size of the MethodData* necessary to store

 // profiling information about a given method.  Size is in bytes.

 int MethodData::compute_allocation_size_in_bytes(methodHandle method) {

   int data_size = 0;

   BytecodeStream stream(method);

   Bytecodes::Code c;

   int empty_bc_count = 0;  // number of bytecodes lacking data

   bool needs_speculative_traps = false;

   while ((c = stream.next()) >= 0) {

     int size_in_bytes = compute_data_size(&stream);

     data_size += size_in_bytes;

     if (size_in_bytes == 0)  empty_bc_count += 1;

     needs_speculative_traps = needs_speculative_traps || is_speculative_trap_bytecode(c);

   }

   int object_size = in_bytes(data_offset()) + data_size;

   // Add some extra DataLayout cells (at least one) to track stray traps.

   int extra_data_count = compute_extra_data_count(data_size, empty_bc_count, needs_speculative_traps);

   object_size += extra_data_count * DataLayout::compute_size_in_bytes(0);

   // Add a cell to record information about modified arguments.

   int arg_size = method->size_of_parameters();

   object_size += DataLayout::compute_size_in_bytes(arg_size+1);

   // Reserve room for an area of the MDO dedicated to profiling of

   // parameters

   int args_cell = ParametersTypeData::compute_cell_count(method());

   if (args_cell > 0) {

     object_size += DataLayout::compute_size_in_bytes(args_cell);

   }

   return object_size;

 }

 // Compute the size of the MethodData* necessary to store

 // profiling information about a given method.  Size is in words

 int MethodData::compute_allocation_size_in_words(methodHandle method) {

   int byte_size = compute_allocation_size_in_bytes(method);

   int word_size = align_size_up(byte_size, BytesPerWord) / BytesPerWord;

   return align_object_size(word_size);

 }

 // Initialize an individual data segment.  Returns the size of

 // the segment in bytes.

 int MethodData::initialize_data(BytecodeStream* stream,

                                        int data_index) {

 #if defined(COMPILER1) && !defined(COMPILER2)

   return 0;

 #else

   int cell_count = -1;

   int tag = DataLayout::no_tag;

   DataLayout* data_layout = data_layout_at(data_index);

   Bytecodes::Code c = stream->code();

   switch (c) {

   case Bytecodes::_checkcast:

   case Bytecodes::_instanceof:

   case Bytecodes::_aastore:

     if (TypeProfileCasts) {

       cell_count = ReceiverTypeData::static_cell_count();

       tag = DataLayout::receiver_type_data_tag;

     } else {

       cell_count = BitData::static_cell_count();

       tag = DataLayout::bit_data_tag;

     }

     break;

   case Bytecodes::_invokespecial:

   case Bytecodes::_invokestatic: {

     int counter_data_cell_count = CounterData::static_cell_count();

     if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||

         profile_return_for_invoke(stream->method(), stream->bci())) {

       cell_count = CallTypeData::compute_cell_count(stream);

     } else {

       cell_count = counter_data_cell_count;

     }

     if (cell_count > counter_data_cell_count) {

       tag = DataLayout::call_type_data_tag;

     } else {

       tag = DataLayout::counter_data_tag;

     }

     break;

   }

   case Bytecodes::_goto:

   case Bytecodes::_goto_w:

   case Bytecodes::_jsr:

   case Bytecodes::_jsr_w:

     cell_count = JumpData::static_cell_count();

     tag = DataLayout::jump_data_tag;

     break;

   case Bytecodes::_invokevirtual:

   case Bytecodes::_invokeinterface: {

     int virtual_call_data_cell_count = VirtualCallData::static_cell_count();

     if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||

         profile_return_for_invoke(stream->method(), stream->bci())) {

       cell_count = VirtualCallTypeData::compute_cell_count(stream);

     } else {

       cell_count = virtual_call_data_cell_count;

     }

     if (cell_count > virtual_call_data_cell_count) {

       tag = DataLayout::virtual_call_type_data_tag;

     } else {

       tag = DataLayout::virtual_call_data_tag;

     }

     break;

   }

   case Bytecodes::_invokedynamic: {

     // %%% should make a type profile for any invokedynamic that takes a ref argument

     int counter_data_cell_count = CounterData::static_cell_count();

     if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||

         profile_return_for_invoke(stream->method(), stream->bci())) {

       cell_count = CallTypeData::compute_cell_count(stream);

     } else {

       cell_count = counter_data_cell_count;

     }

     if (cell_count > counter_data_cell_count) {

       tag = DataLayout::call_type_data_tag;

     } else {

       tag = DataLayout::counter_data_tag;

     }

     break;

   }

   case Bytecodes::_ret:

     cell_count = RetData::static_cell_count();

     tag = DataLayout::ret_data_tag;

     break;

   case Bytecodes::_ifeq:

   case Bytecodes::_ifne:

   case Bytecodes::_iflt:

   case Bytecodes::_ifge:

   case Bytecodes::_ifgt:

   case Bytecodes::_ifle:

   case Bytecodes::_if_icmpeq:

   case Bytecodes::_if_icmpne:

   case Bytecodes::_if_icmplt:

   case Bytecodes::_if_icmpge:

   case Bytecodes::_if_icmpgt:

   case Bytecodes::_if_icmple:

   case Bytecodes::_if_acmpeq:

   case Bytecodes::_if_acmpne:

   case Bytecodes::_ifnull:

   case Bytecodes::_ifnonnull:

     cell_count = BranchData::static_cell_count();

     tag = DataLayout::branch_data_tag;

     break;

   case Bytecodes::_lookupswitch:

   case Bytecodes::_tableswitch:

     cell_count = MultiBranchData::compute_cell_count(stream);

     tag = DataLayout::multi_branch_data_tag;

     break;

   }

   assert(tag == DataLayout::multi_branch_data_tag ||

          ((MethodData::profile_arguments() || MethodData::profile_return()) &&

           (tag == DataLayout::call_type_data_tag ||

            tag == DataLayout::counter_data_tag ||

            tag == DataLayout::virtual_call_type_data_tag ||

            tag == DataLayout::virtual_call_data_tag)) ||

          cell_count == bytecode_cell_count(c), "cell counts must agree");

   if (cell_count >= 0) {

     assert(tag != DataLayout::no_tag, "bad tag");

     assert(bytecode_has_profile(c), "agree w/ BHP");

     data_layout->initialize(tag, stream->bci(), cell_count);

     return DataLayout::compute_size_in_bytes(cell_count);

   } else {

     assert(!bytecode_has_profile(c), "agree w/ !BHP");

     return 0;

   }

 #endif

 }

 // Get the data at an arbitrary (sort of) data index.

 ProfileData* MethodData::data_at(int data_index) const {

   if (out_of_bounds(data_index)) {

     return NULL;

   }

   DataLayout* data_layout = data_layout_at(data_index);

   return data_layout->data_in();

 }

 ProfileData* DataLayout::data_in() {

   switch (tag()) {

   case DataLayout::no_tag:

   default:

     ShouldNotReachHere();

     return NULL;

   case DataLayout::bit_data_tag:

     return new BitData(this);

   case DataLayout::counter_data_tag:

     return new CounterData(this);

   case DataLayout::jump_data_tag:

     return new JumpData(this);

   case DataLayout::receiver_type_data_tag:

     return new ReceiverTypeData(this);

   case DataLayout::virtual_call_data_tag:

     return new VirtualCallData(this);

   case DataLayout::ret_data_tag:

     return new RetData(this);

   case DataLayout::branch_data_tag:

     return new BranchData(this);

   case DataLayout::multi_branch_data_tag:

     return new MultiBranchData(this);

   case DataLayout::arg_info_data_tag:

     return new ArgInfoData(this);

   case DataLayout::call_type_data_tag:

     return new CallTypeData(this);

   case DataLayout::virtual_call_type_data_tag:

     return new VirtualCallTypeData(this);

   case DataLayout::parameters_type_data_tag:

     return new ParametersTypeData(this);

   };

 }

 // Iteration over data.

 ProfileData* MethodData::next_data(ProfileData* current) const {

   int current_index = dp_to_di(current->dp());

   int next_index = current_index + current->size_in_bytes();

   ProfileData* next = data_at(next_index);

   return next;

 }

 // Give each of the data entries a chance to perform specific

 // data initialization.

 void MethodData::post_initialize(BytecodeStream* stream) {

   ResourceMark rm;

   ProfileData* data;

   for (data = first_data(); is_valid(data); data = next_data(data)) {

     stream->set_start(data->bci());

     stream->next();

     data->post_initialize(stream, this);

   }

   if (_parameters_type_data_di != -1) {

     parameters_type_data()->post_initialize(NULL, this);

   }

 }

 // Initialize the MethodData* corresponding to a given method.

 MethodData::MethodData(methodHandle method, int size, TRAPS)

   : _extra_data_lock(Monitor::leaf, "MDO extra data lock") {

   No_Safepoint_Verifier no_safepoint;  // init function atomic wrt GC

   ResourceMark rm;

   // Set the method back-pointer.

   _method = method();

   init();

   set_creation_mileage(mileage_of(method()));

   // Go through the bytecodes and allocate and initialize the

   // corresponding data cells.

   int data_size = 0;

   int empty_bc_count = 0;  // number of bytecodes lacking data

   _data[0] = 0;  // apparently not set below.

   BytecodeStream stream(method);

   Bytecodes::Code c;

   bool needs_speculative_traps = false;

   while ((c = stream.next()) >= 0) {

     int size_in_bytes = initialize_data(&stream, data_size);

     data_size += size_in_bytes;

     if (size_in_bytes == 0)  empty_bc_count += 1;

     needs_speculative_traps = needs_speculative_traps || is_speculative_trap_bytecode(c);

   }

   _data_size = data_size;

   int object_size = in_bytes(data_offset()) + data_size;

   // Add some extra DataLayout cells (at least one) to track stray traps.

   int extra_data_count = compute_extra_data_count(data_size, empty_bc_count, needs_speculative_traps);

   int extra_size = extra_data_count * DataLayout::compute_size_in_bytes(0);

   // Let's zero the space for the extra data

   Copy::zero_to_bytes(((address)_data) + data_size, extra_size);

   // Add a cell to record information about modified arguments.

   // Set up _args_modified array after traps cells so that

   // the code for traps cells works.

   DataLayout *dp = data_layout_at(data_size + extra_size);

   int arg_size = method->size_of_parameters();

   dp->initialize(DataLayout::arg_info_data_tag, 0, arg_size+1);

   int arg_data_size = DataLayout::compute_size_in_bytes(arg_size+1);

   object_size += extra_size + arg_data_size;

   int parms_cell = ParametersTypeData::compute_cell_count(method());

   // If we are profiling parameters, we reserver an area near the end

   // of the MDO after the slots for bytecodes (because there's no bci

   // for method entry so they don't fit with the framework for the

   // profiling of bytecodes). We store the offset within the MDO of

   // this area (or -1 if no parameter is profiled)

   if (parms_cell > 0) {

     object_size += DataLayout::compute_size_in_bytes(parms_cell);

     _parameters_type_data_di = data_size + extra_size + arg_data_size;

     DataLayout *dp = data_layout_at(data_size + extra_size + arg_data_size);

     dp->initialize(DataLayout::parameters_type_data_tag, 0, parms_cell);

   } else {

     _parameters_type_data_di = -1;

   }

   // Set an initial hint. Don't use set_hint_di() because

   // first_di() may be out of bounds if data_size is 0.

   // In that situation, _hint_di is never used, but at

   // least well-defined.

   _hint_di = first_di();

   post_initialize(&stream);

   set_size(object_size);

 }

 void MethodData::init() {

   _invocation_counter.init();

   _backedge_counter.init();

   _invocation_counter_start = 0;

   _backedge_counter_start = 0;

   _num_loops = 0;

   _num_blocks = 0;

   _would_profile = unknown;

 #if INCLUDE_RTM_OPT

   _rtm_state = NoRTM; // No RTM lock eliding by default

   if (UseRTMLocking &&

       !CompilerOracle::has_option_string(_method, "NoRTMLockEliding")) {

     if (CompilerOracle::has_option_string(_method, "UseRTMLockEliding") || !UseRTMDeopt) {

       // Generate RTM lock eliding code without abort ratio calculation code.

       _rtm_state = UseRTM;

     } else if (UseRTMDeopt) {

       // Generate RTM lock eliding code and include abort ratio calculation

       // code if UseRTMDeopt is on.

       _rtm_state = ProfileRTM;

     }

   }

 #endif

   // Initialize flags and trap history.

   _nof_decompiles = 0;

   _nof_overflow_recompiles = 0;

   _nof_overflow_traps = 0;

   clear_escape_info();

   assert(sizeof(_trap_hist) % sizeof(HeapWord) == 0, "align");

   Copy::zero_to_words((HeapWord*) &_trap_hist,

                       sizeof(_trap_hist) / sizeof(HeapWord));

 }

 // Get a measure of how much mileage the method has on it.

 int MethodData::mileage_of(Method* method) {

   int mileage = 0;

   if (TieredCompilation) {

     mileage = MAX2(method->invocation_count(), method->backedge_count());

   } else {

     int iic = method->interpreter_invocation_count();

     if (mileage < iic)  mileage = iic;

     MethodCounters* mcs = method->method_counters();

     if (mcs != NULL) {

       InvocationCounter* ic = mcs->invocation_counter();

       InvocationCounter* bc = mcs->backedge_counter();

       int icval = ic->count();

       if (ic->carry()) icval += CompileThreshold;

       if (mileage < icval)  mileage = icval;

       int bcval = bc->count();

       if (bc->carry()) bcval += CompileThreshold;

       if (mileage < bcval)  mileage = bcval;

     }

   }

   return mileage;

 }

 bool MethodData::is_mature() const {

   return CompilationPolicy::policy()->is_mature(_method);

 }

 // Translate a bci to its corresponding data index (di).

 address MethodData::bci_to_dp(int bci) {

   ResourceMark rm;

   ProfileData* data = data_before(bci);

   ProfileData* prev = NULL;

   for ( ; is_valid(data); data = next_data(data)) {

     if (data->bci() >= bci) {

       if (data->bci() == bci)  set_hint_di(dp_to_di(data->dp()));

       else if (prev != NULL)   set_hint_di(dp_to_di(prev->dp()));

       return data->dp();

     }

     prev = data;

   }

   return (address)limit_data_position();

 }

 // Translate a bci to its corresponding data, or NULL.

 ProfileData* MethodData::bci_to_data(int bci) {

   ProfileData* data = data_before(bci);

   for ( ; is_valid(data); data = next_data(data)) {

     if (data->bci() == bci) {

       set_hint_di(dp_to_di(data->dp()));

       return data;

     } else if (data->bci() > bci) {

       break;

     }

   }

   return bci_to_extra_data(bci, NULL, false);

 }

 DataLayout* MethodData::next_extra(DataLayout* dp) {

   int nb_cells = 0;

   switch(dp->tag()) {

   case DataLayout::bit_data_tag:

   case DataLayout::no_tag:

     nb_cells = BitData::static_cell_count();

     break;

   case DataLayout::speculative_trap_data_tag:

     nb_cells = SpeculativeTrapData::static_cell_count();

     break;

   default:

     fatal(err_msg("unexpected tag %d", dp->tag()));

   }

   return (DataLayout*)((address)dp + DataLayout::compute_size_in_bytes(nb_cells));

 }

 ProfileData* MethodData::bci_to_extra_data_helper(int bci, Method* m, DataLayout*& dp, bool concurrent) {

   DataLayout* end = extra_data_limit();

   for (;; dp = next_extra(dp)) {

     assert(dp < end, "moved past end of extra data");

     // No need for "OrderAccess::load_acquire" ops,

     // since the data structure is monotonic.

     switch(dp->tag()) {

     case DataLayout::no_tag:

       return NULL;

     case DataLayout::arg_info_data_tag:

       dp = end;

       return NULL; // ArgInfoData is at the end of extra data section.

     case DataLayout::bit_data_tag:

       if (m == NULL && dp->bci() == bci) {

         return new BitData(dp);

       }

       break;

     case DataLayout::speculative_trap_data_tag:

       if (m != NULL) {

         SpeculativeTrapData* data = new SpeculativeTrapData(dp);

         // data->method() may be null in case of a concurrent

         // allocation. Maybe it's for the same method. Try to use that

         // entry in that case.

         if (dp->bci() == bci) {

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

             assert(concurrent, "impossible because no concurrent allocation");

             return NULL;

           } else if (data->method() == m) {

             return data;

           }

         }

       }

       break;

     default:

       fatal(err_msg("unexpected tag %d", dp->tag()));

     }

   }

   return NULL;

 }

 // Translate a bci to its corresponding extra data, or NULL.

 ProfileData* MethodData::bci_to_extra_data(int bci, Method* m, bool create_if_missing) {

   // This code assumes an entry for a SpeculativeTrapData is 2 cells

   assert(2*DataLayout::compute_size_in_bytes(BitData::static_cell_count()) ==

          DataLayout::compute_size_in_bytes(SpeculativeTrapData::static_cell_count()),

          "code needs to be adjusted");

   DataLayout* dp  = extra_data_base();

   DataLayout* end = extra_data_limit();

   // Allocation in the extra data space has to be atomic because not

   // all entries have the same size and non atomic concurrent

   // allocation would result in a corrupted extra data space.

   ProfileData* result = bci_to_extra_data_helper(bci, m, dp, true);

   if (result != NULL) {

     return result;

   }

   if (create_if_missing && dp < end) {

     MutexLocker ml(&_extra_data_lock);

     // Check again now that we have the lock. Another thread may

     // have added extra data entries.

     ProfileData* result = bci_to_extra_data_helper(bci, m, dp, false);

     if (result != NULL || dp >= end) {

       return result;

     }

     assert(dp->tag() == DataLayout::no_tag || (dp->tag() == DataLayout::speculative_trap_data_tag && m != NULL), "should be free");

     assert(next_extra(dp)->tag() == DataLayout::no_tag || next_extra(dp)->tag() == DataLayout::arg_info_data_tag, "should be free or arg info");

     u1 tag = m == NULL ? DataLayout::bit_data_tag : DataLayout::speculative_trap_data_tag;

     // SpeculativeTrapData is 2 slots. Make sure we have room.

     if (m != NULL && next_extra(dp)->tag() != DataLayout::no_tag) {

       return NULL;

     }

     DataLayout temp;

     temp.initialize(tag, bci, 0);

     dp->set_header(temp.header());

     assert(dp->tag() == tag, "sane");

     assert(dp->bci() == bci, "no concurrent allocation");

     if (tag == DataLayout::bit_data_tag) {

       return new BitData(dp);

     } else {

       SpeculativeTrapData* data = new SpeculativeTrapData(dp);

       data->set_method(m);

       return data;

     }

   }

   return NULL;

 }

 ArgInfoData *MethodData::arg_info() {

   DataLayout* dp    = extra_data_base();

   DataLayout* end   = extra_data_limit();

   for (; dp < end; dp = next_extra(dp)) {

     if (dp->tag() == DataLayout::arg_info_data_tag)

       return new ArgInfoData(dp);

   }

   return NULL;

 }

 // Printing

 #ifndef PRODUCT

 void MethodData::print_on(outputStream* st) const {

   assert(is_methodData(), "should be method data");

   st->print("method data for ");

   method()->print_value_on(st);

   st->cr();

   print_data_on(st);

 }

 #endif //PRODUCT

 void MethodData::print_value_on(outputStream* st) const {

   assert(is_methodData(), "should be method data");

   st->print("method data for ");

   method()->print_value_on(st);

 }

 #ifndef PRODUCT

 void MethodData::print_data_on(outputStream* st) const {

   ResourceMark rm;

   ProfileData* data = first_data();

   if (_parameters_type_data_di != -1) {

     parameters_type_data()->print_data_on(st);

   }

   for ( ; is_valid(data); data = next_data(data)) {

     st->print("%d", dp_to_di(data->dp()));

     st->fill_to(6);

     data->print_data_on(st, this);

   }

   st->print_cr("--- Extra data:");

   DataLayout* dp    = extra_data_base();

   DataLayout* end   = extra_data_limit();

   for (;; dp = next_extra(dp)) {

     assert(dp < end, "moved past end of extra data");

     // No need for "OrderAccess::load_acquire" ops,

     // since the data structure is monotonic.

     switch(dp->tag()) {

     case DataLayout::no_tag:

       continue;

     case DataLayout::bit_data_tag:

       data = new BitData(dp);

       break;

     case DataLayout::speculative_trap_data_tag:

       data = new SpeculativeTrapData(dp);

       break;

     case DataLayout::arg_info_data_tag:

       data = new ArgInfoData(dp);

       dp = end; // ArgInfoData is at the end of extra data section.

       break;

     default:

       fatal(err_msg("unexpected tag %d", dp->tag()));

     }

     st->print("%d", dp_to_di(data->dp()));

     st->fill_to(6);

     data->print_data_on(st);

     if (dp >= end) return;

   }

 }

 #endif

 #if INCLUDE_SERVICES

 // Size Statistics

 void MethodData::collect_statistics(KlassSizeStats *sz) const {

   int n = sz->count(this);

   sz->_method_data_bytes += n;

   sz->_method_all_bytes += n;

   sz->_rw_bytes += n;

 }

 #endif // INCLUDE_SERVICES

 // Verification

 void MethodData::verify_on(outputStream* st) {

   guarantee(is_methodData(), "object must be method data");

   // guarantee(m->is_perm(), "should be in permspace");

   this->verify_data_on(st);

 }

 void MethodData::verify_data_on(outputStream* st) {

   NEEDS_CLEANUP;

   // not yet implemented.

 }

 bool MethodData::profile_jsr292(methodHandle m, int bci) {

   if (m->is_compiled_lambda_form()) {

     return true;

   }

   Bytecode_invoke inv(m , bci);

   return inv.is_invokedynamic() || inv.is_invokehandle();

 }

 int MethodData::profile_arguments_flag() {

   return TypeProfileLevel % 10;

 }

 bool MethodData::profile_arguments() {

   return profile_arguments_flag() > no_type_profile && profile_arguments_flag() <= type_profile_all;

 }

 bool MethodData::profile_arguments_jsr292_only() {

   return profile_arguments_flag() == type_profile_jsr292;

 }

 bool MethodData::profile_all_arguments() {

   return profile_arguments_flag() == type_profile_all;

 }

 bool MethodData::profile_arguments_for_invoke(methodHandle m, int bci) {

   if (!profile_arguments()) {

     return false;

   }

   if (profile_all_arguments()) {

     return true;

   }

   assert(profile_arguments_jsr292_only(), "inconsistent");

   return profile_jsr292(m, bci);

 }

 int MethodData::profile_return_flag() {

   return (TypeProfileLevel % 100) / 10;

 }

 bool MethodData::profile_return() {

   return profile_return_flag() > no_type_profile && profile_return_flag() <= type_profile_all;

 }

 bool MethodData::profile_return_jsr292_only() {

   return profile_return_flag() == type_profile_jsr292;

 }

 bool MethodData::profile_all_return() {

   return profile_return_flag() == type_profile_all;

 }

 bool MethodData::profile_return_for_invoke(methodHandle m, int bci) {

   if (!profile_return()) {

     return false;

   }

   if (profile_all_return()) {

     return true;

   }

   assert(profile_return_jsr292_only(), "inconsistent");

   return profile_jsr292(m, bci);

 }

 int MethodData::profile_parameters_flag() {

   return TypeProfileLevel / 100;

 }

 bool MethodData::profile_parameters() {

   return profile_parameters_flag() > no_type_profile && profile_parameters_flag() <= type_profile_all;

 }

 bool MethodData::profile_parameters_jsr292_only() {

   return profile_parameters_flag() == type_profile_jsr292;

 }

 bool MethodData::profile_all_parameters() {

   return profile_parameters_flag() == type_profile_all;

 }

 bool MethodData::profile_parameters_for_method(methodHandle m) {

   if (!profile_parameters()) {

     return false;

   }

   if (profile_all_parameters()) {

     return true;

   }

   assert(profile_parameters_jsr292_only(), "inconsistent");

   return m->is_compiled_lambda_form();

 }

 void MethodData::clean_extra_data_helper(DataLayout* dp, int shift, bool reset) {

   if (shift == 0) {

     return;

   }

   if (!reset) {

     // Move all cells of trap entry at dp left by "shift" cells

     intptr_t* start = (intptr_t*)dp;

     intptr_t* end = (intptr_t*)next_extra(dp);

     for (intptr_t* ptr = start; ptr < end; ptr++) {

       *(ptr-shift) = *ptr;

     }

   } else {

     // Reset "shift" cells stopping at dp

     intptr_t* start = ((intptr_t*)dp) - shift;

     intptr_t* end = (intptr_t*)dp;

     for (intptr_t* ptr = start; ptr < end; ptr++) {

       *ptr = 0;

     }

   }

 }

 class CleanExtraDataClosure : public StackObj {

 public:

   virtual bool is_live(Method* m) = 0;

 };

 // Check for entries that reference an unloaded method

 class CleanExtraDataKlassClosure : public CleanExtraDataClosure {

 private:

   BoolObjectClosure* _is_alive;

 public:

   CleanExtraDataKlassClosure(BoolObjectClosure* is_alive) : _is_alive(is_alive) {}

   bool is_live(Method* m) {

     return m->method_holder()->is_loader_alive(_is_alive);

   }

 };

 // Check for entries that reference a redefined method

 class CleanExtraDataMethodClosure : public CleanExtraDataClosure {

 public:

   CleanExtraDataMethodClosure() {}

   bool is_live(Method* m) {

     return m->on_stack();

   }

 };

 // Remove SpeculativeTrapData entries that reference an unloaded or

 // redefined method

 void MethodData::clean_extra_data(CleanExtraDataClosure* cl) {

   DataLayout* dp  = extra_data_base();

   DataLayout* end = extra_data_limit();

   int shift = 0;

   for (; dp < end; dp = next_extra(dp)) {

     switch(dp->tag()) {

     case DataLayout::speculative_trap_data_tag: {

       SpeculativeTrapData* data = new SpeculativeTrapData(dp);

       Method* m = data->method();

       assert(m != NULL, "should have a method");

       if (!cl->is_live(m)) {

         // "shift" accumulates the number of cells for dead

         // SpeculativeTrapData entries that have been seen so

         // far. Following entries must be shifted left by that many

         // cells to remove the dead SpeculativeTrapData entries.

         shift += (int)((intptr_t*)next_extra(dp) - (intptr_t*)dp);

       } else {

         // Shift this entry left if it follows dead

         // SpeculativeTrapData entries

         clean_extra_data_helper(dp, shift);

       }

       break;

     }

     case DataLayout::bit_data_tag:

       // Shift this entry left if it follows dead SpeculativeTrapData

       // entries

       clean_extra_data_helper(dp, shift);

       continue;

     case DataLayout::no_tag:

     case DataLayout::arg_info_data_tag:

       // We are at end of the live trap entries. The previous "shift"

       // cells contain entries that are either dead or were shifted

       // left. They need to be reset to no_tag

       clean_extra_data_helper(dp, shift, true);

       return;

     default:

       fatal(err_msg("unexpected tag %d", dp->tag()));

     }

   }

 }

 // Verify there's no unloaded or redefined method referenced by a

 // SpeculativeTrapData entry

 void MethodData::verify_extra_data_clean(CleanExtraDataClosure* cl) {

 #ifdef ASSERT

   DataLayout* dp  = extra_data_base();

   DataLayout* end = extra_data_limit();

   for (; dp < end; dp = next_extra(dp)) {

     switch(dp->tag()) {

     case DataLayout::speculative_trap_data_tag: {

       SpeculativeTrapData* data = new SpeculativeTrapData(dp);

       Method* m = data->method();

       assert(m != NULL && cl->is_live(m), "Method should exist");

       break;

     }

     case DataLayout::bit_data_tag:

       continue;

     case DataLayout::no_tag:

     case DataLayout::arg_info_data_tag:

       return;

     default:

       fatal(err_msg("unexpected tag %d", dp->tag()));

     }

   }

 #endif

 }

 void MethodData::clean_method_data(BoolObjectClosure* is_alive) {

   for (ProfileData* data = first_data();

        is_valid(data);

        data = next_data(data)) {

     data->clean_weak_klass_links(is_alive);

   }

   ParametersTypeData* parameters = parameters_type_data();

   if (parameters != NULL) {

     parameters->clean_weak_klass_links(is_alive);

   }

   CleanExtraDataKlassClosure cl(is_alive);

   clean_extra_data(&cl);

   verify_extra_data_clean(&cl);

 }

 void MethodData::clean_weak_method_links() {

   for (ProfileData* data = first_data();

        is_valid(data);

        data = next_data(data)) {

     data->clean_weak_method_links();

   }

   CleanExtraDataMethodClosure cl;

   clean_extra_data(&cl);

   verify_extra_data_clean(&cl);

 }