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

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

src/share/vm/oops/methodData.cpp

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

author: coleenp
date: Sat, 01 Sep 2012 13:25:18 -0400
changeset 4037: da91efe96a93
parent 2571: src/share/vm/oops/methodDataOop.cpp@a97fd181b813
child 4497: 16fb9f942703
permissions: -rw-r--r--

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

 /*
  * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "interpreter/bytecode.hpp"
 #include "interpreter/bytecodeStream.hpp"
 #include "interpreter/linkResolver.hpp"
 #include "oops/methodData.hpp"
 #include "prims/jvmtiRedefineClasses.hpp"
 #include "runtime/compilationPolicy.hpp"
 #include "runtime/deoptimization.hpp"
 #include "runtime/handles.inline.hpp"
 // ==================================================================
 // 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);
 }
 // 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.
   }
 }
 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;
 }
 #ifndef PRODUCT
 void ProfileData::print_shared(outputStream* st, const char* name) {
   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));
   }
   int flags = data()->flags();
   if (flags != 0)
     st->print("flags(%d) ", flags);
 }
 void ProfileData::tab(outputStream* st) {
   st->fill_to(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) {
   print_shared(st, "BitData");
 }
 #endif // !PRODUCT
 // ==================================================================
 // CounterData
 //
 // A CounterData corresponds to a simple counter.
 #ifndef PRODUCT
 void CounterData::print_data_on(outputStream* st) {
   print_shared(st, "CounterData");
   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) {
   print_shared(st, "JumpData");
   st->print_cr("taken(%u) displacement(%d)", taken(), displacement());
 }
 #endif // !PRODUCT
 // ==================================================================
 // 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) {
   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) {
   print_shared(st, "ReceiverTypeData");
   print_receiver_data_on(st);
 }
 void VirtualCallData::print_data_on(outputStream* st) {
   print_shared(st, "VirtualCallData");
   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;
 }
 #ifndef PRODUCT
 void RetData::print_data_on(outputStream* st) {
   print_shared(st, "RetData");
   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) {
   print_shared(st, "BranchData");
   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) {
   print_shared(st, "MultiBranchData");
   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) {
   print_shared(st, "ArgInfoData");
   int nargs = number_of_args();
   for (int i = 0; i < nargs; i++) {
     st->print("  0x%x", arg_modified(i));
   }
   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, THREAD) MethodData(method(), size, CHECK_NULL);
 }
 int MethodData::bytecode_cell_count(Bytecodes::Code code) {
   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:
     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:
     return VirtualCallData::static_cell_count();
   case Bytecodes::_invokedynamic:
     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;
 }
 // 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) {
     cell_count = MultiBranchData::compute_cell_count(stream);
   }
   // 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);
 }
 int MethodData::compute_extra_data_count(int data_size, int empty_bc_count) {
   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
     return extra_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
   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;
   }
   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);
   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);
   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) {
   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:
     cell_count = CounterData::static_cell_count();
     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:
     cell_count = VirtualCallData::static_cell_count();
     tag = DataLayout::virtual_call_data_tag;
     break;
   case Bytecodes::_invokedynamic:
     // %%% should make a type profile for any invokedynamic that takes a ref argument
     cell_count = CounterData::static_cell_count();
     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 ||
          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;
   }
 }
 // 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);
   };
 }
 // 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);
   }
 }
 // Initialize the MethodData* corresponding to a given method.
 MethodData::MethodData(methodHandle method, int size, TRAPS) {
   No_Safepoint_Verifier no_safepoint;  // init function atomic wrt GC
   ResourceMark rm;
   // Set the method back-pointer.
   _method = method();
   if (TieredCompilation) {
     _invocation_counter.init();
     _backedge_counter.init();
     _invocation_counter_start = 0;
     _backedge_counter_start = 0;
     _num_loops = 0;
     _num_blocks = 0;
     _highest_comp_level = 0;
     _highest_osr_comp_level = 0;
     _would_profile = true;
   }
   set_creation_mileage(mileage_of(method()));
   // Initialize flags and trap history.
   _nof_decompiles = 0;
   _nof_overflow_recompiles = 0;
   _nof_overflow_traps = 0;
   assert(sizeof(_trap_hist) % sizeof(HeapWord) == 0, "align");
   Copy::zero_to_words((HeapWord*) &_trap_hist,
                       sizeof(_trap_hist) / sizeof(HeapWord));
   // 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
   BytecodeStream stream(method);
   Bytecodes::Code c;
   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;
   }
   _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);
   int extra_size = extra_data_count * DataLayout::compute_size_in_bytes(0);
   // 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);
   object_size += extra_size + DataLayout::compute_size_in_bytes(arg_size+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);
 }
 // 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;
     InvocationCounter* ic = method->invocation_counter();
     InvocationCounter* bc = method->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, false);
 }
 // Translate a bci to its corresponding extra data, or NULL.
 ProfileData* MethodData::bci_to_extra_data(int bci, bool create_if_missing) {
   DataLayout* dp    = extra_data_base();
   DataLayout* end   = extra_data_limit();
   DataLayout* avail = NULL;
   for (; dp < end; dp = next_extra(dp)) {
     // No need for "OrderAccess::load_acquire" ops,
     // since the data structure is monotonic.
     if (dp->tag() == DataLayout::no_tag)  break;
     if (dp->tag() == DataLayout::arg_info_data_tag) {
       dp = end; // ArgInfoData is at the end of extra data section.
       break;
     }
     if (dp->bci() == bci) {
       assert(dp->tag() == DataLayout::bit_data_tag, "sane");
       return new BitData(dp);
     }
   }
   if (create_if_missing && dp < end) {
     // Allocate this one.  There is no mutual exclusion,
     // so two threads could allocate different BCIs to the
     // same data layout.  This means these extra data
     // records, like most other MDO contents, must not be
     // trusted too much.
     DataLayout temp;
     temp.initialize(DataLayout::bit_data_tag, bci, 0);
     dp->release_set_header(temp.header());
     assert(dp->tag() == DataLayout::bit_data_tag, "sane");
     //NO: assert(dp->bci() == bci, "no concurrent allocation");
     return new BitData(dp);
   }
   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();
   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);
   }
   st->print_cr("--- Extra data:");
   DataLayout* dp    = extra_data_base();
   DataLayout* end   = extra_data_limit();
   for (; dp < end; dp = next_extra(dp)) {
     // No need for "OrderAccess::load_acquire" ops,
     // since the data structure is monotonic.
     if (dp->tag() == DataLayout::no_tag)  continue;
     if (dp->tag() == DataLayout::bit_data_tag) {
       data = new BitData(dp);
     } else {
       assert(dp->tag() == DataLayout::arg_info_data_tag, "must be BitData or ArgInfo");
       data = new ArgInfoData(dp);
       dp = end; // ArgInfoData is at the end of extra data section.
     }
     st->print("%d", dp_to_di(data->dp()));
     st->fill_to(6);
     data->print_data_on(st);
   }
 }
 #endif
 // 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.
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

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

src/share/vm/oops/methodData.cpp