jdk8-mips64-public/hotspot: src/share/vm/oops/methodDataOop.cpp@8b46c4d82093 (annotated)

src/share/vm/oops/methodDataOop.cpp@8b46c4d82093 (annotated)

src/share/vm/oops/methodDataOop.cpp

Wed, 02 Sep 2009 00:04:29 -0700

author: ysr
date: Wed, 02 Sep 2009 00:04:29 -0700
changeset 1376: 8b46c4d82093
parent 1279: bd02caa94611
child 1907: c18cbe5936b8
permissions: -rw-r--r--

4957990: Perm heap bloat in JVM
Summary: Treat ProfileData in MDO's as a source of weak, not strong, roots. Fixes the bug for stop-world collection -- the case of concurrent collection will be fixed separately.
Reviewed-by: jcoomes, jmasa, kvn, never

 /*
  * Copyright 2000-2009 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/_methodDataOop.cpp.incl"
 // ==================================================================
 // 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::follow_weak_refs(BoolObjectClosure* cl) {
   ResourceMark m;
   data_in()->follow_weak_refs(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, methodDataOop 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 (klassOop, count) pairs
 // which are used to store a type profile for the receiver of the check.
 void ReceiverTypeData::follow_contents() {
   // This is a set of weak references that need
   // to be followed at the end of the strong marking
   // phase. Memoize this object so it can be visited
   // in the weak roots processing phase.
   MarkSweep::revisit_mdo(data());
 }
 #ifndef SERIALGC
 void ReceiverTypeData::follow_contents(ParCompactionManager* cm) {
   // This is a set of weak references that need
   // to be followed at the end of the strong marking
   // phase. Memoize this object so it can be visited
   // in the weak roots processing phase.
   PSParallelCompact::revisit_mdo(cm, data());
 }
 #endif // SERIALGC
 void ReceiverTypeData::oop_iterate(OopClosure* blk) {
   if (blk->should_remember_mdo()) {
     // This is a set of weak references that need
     // to be followed at the end of the strong marking
     // phase. Memoize this object so it can be visited
     // in the weak roots processing phase.
     blk->remember_mdo(data());
   } else { // normal scan
     for (uint row = 0; row < row_limit(); row++) {
       if (receiver(row) != NULL) {
         oop* adr = adr_receiver(row);
         blk->do_oop(adr);
       }
     }
   }
 }
 void ReceiverTypeData::oop_iterate_m(OopClosure* blk, MemRegion mr) {
   // Currently, this interface is called only during card-scanning for
   // a young gen gc, in which case this object cannot contribute anything,
   // since it does not contain any references that cross out of
   // the perm gen. However, for future more general use we allow
   // the possibility of calling for instance from more general
   // iterators (for example, a future regionalized perm gen for G1,
   // or the possibility of moving some references out of perm in
   // the case of other collectors). In that case, you will need
   // to relax or remove some of the assertions below.
 #ifdef ASSERT
   // Verify that none of the embedded oop references cross out of
   // this generation.
   for (uint row = 0; row < row_limit(); row++) {
     if (receiver(row) != NULL) {
       oop* adr = adr_receiver(row);
       CollectedHeap* h = Universe::heap();
       assert(h->is_permanent(adr) && h->is_permanent_or_null(*adr), "Not intra-perm");
     }
   }
 #endif // ASSERT
   assert(!blk->should_remember_mdo(), "Not expected to remember MDO");
   return;   // Nothing to do, see comment above
 #if 0
   if (blk->should_remember_mdo()) {
     // This is a set of weak references that need
     // to be followed at the end of the strong marking
     // phase. Memoize this object so it can be visited
     // in the weak roots processing phase.
     blk->remember_mdo(data());
   } else { // normal scan
     for (uint row = 0; row < row_limit(); row++) {
       if (receiver(row) != NULL) {
         oop* adr = adr_receiver(row);
         if (mr.contains(adr)) {
           blk->do_oop(adr);
         } else if ((HeapWord*)adr >= mr.end()) {
           // Test that the current cursor and the two ends of the range
           // that we may have skipped iterating over are monotonically ordered;
           // this is just a paranoid assertion, just in case represetations
           // should change in the future rendering the short-circuit return
           // here invalid.
           assert((row+1 >= row_limit() || adr_receiver(row+1) > adr) &&
                  (row+2 >= row_limit() || adr_receiver(row_limit()-1) > adr_receiver(row+1)), "Reducing?");
           break; // remaining should be outside this mr too
         }
       }
     }
   }
 #endif
 }
 void ReceiverTypeData::adjust_pointers() {
   for (uint row = 0; row < row_limit(); row++) {
     if (receiver(row) != NULL) {
       MarkSweep::adjust_pointer(adr_receiver(row));
     }
   }
 }
 void ReceiverTypeData::follow_weak_refs(BoolObjectClosure* is_alive_cl) {
   for (uint row = 0; row < row_limit(); row++) {
     klassOop p = receiver(row);
     if (p != NULL && !is_alive_cl->do_object_b(p)) {
       clear_row(row);
     }
   }
 }
 #ifndef SERIALGC
 void ReceiverTypeData::update_pointers() {
   for (uint row = 0; row < row_limit(); row++) {
     if (receiver_unchecked(row) != NULL) {
       PSParallelCompact::adjust_pointer(adr_receiver(row));
     }
   }
 }
 void ReceiverTypeData::update_pointers(HeapWord* beg_addr, HeapWord* end_addr) {
   // The loop bounds could be computed based on beg_addr/end_addr and the
   // boundary test hoisted outside the loop (see klassVTable for an example);
   // however, row_limit() is small enough (2) to make that less efficient.
   for (uint row = 0; row < row_limit(); row++) {
     if (receiver_unchecked(row) != NULL) {
       PSParallelCompact::adjust_pointer(adr_receiver(row), beg_addr, end_addr);
     }
   }
 }
 #endif // SERIALGC
 #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);
   for (row = 0; row < row_limit(); row++) {
     if (receiver(row) != NULL) {
       tab(st);
       receiver(row)->print_value_on(st);
       st->print_cr("(%u)", receiver_count(row));
     }
   }
 }
 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, methodDataOop 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, methodDataHandle 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, methodDataOop 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 = Bytecode_tableswitch_at(stream->bcp());
     cell_count = 1 + per_case_cell_count * (1 + sw->length()); // 1 for default
   } else {
     Bytecode_lookupswitch* sw = Bytecode_lookupswitch_at(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,
                                       methodDataOop 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 = Bytecode_tableswitch_at(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 = Bytecode_lookupswitch_at(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
 // ==================================================================
 // methodDataOop
 //
 // A methodDataOop holds information which has been collected about
 // a method.
 int methodDataOopDesc::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 methodDataOopDesc::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 methodDataOopDesc::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 methodDataOop necessary to store
 // profiling information about a given method.  Size is in bytes.
 int methodDataOopDesc::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 methodDataOop necessary to store
 // profiling information about a given method.  Size is in words
 int methodDataOopDesc::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 methodDataOopDesc::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* methodDataOopDesc::data_at(int data_index) {
   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* methodDataOopDesc::next_data(ProfileData* current) {
   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 methodDataOopDesc::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 methodDataOop corresponding to a given method.
 void methodDataOopDesc::initialize(methodHandle method) {
   ResourceMark rm;
   // Set the method back-pointer.
   _method = method();
   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_object_is_parsable(object_size);
 }
 // Get a measure of how much mileage the method has on it.
 int methodDataOopDesc::mileage_of(methodOop method) {
   int mileage = 0;
   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 methodDataOopDesc::is_mature() const {
   uint current = mileage_of(_method);
   uint initial = creation_mileage();
   if (current < initial)
     return true;  // some sort of overflow
   uint target;
   if (ProfileMaturityPercentage <= 0)
     target = (uint) -ProfileMaturityPercentage;  // absolute value
   else
     target = (uint)( (ProfileMaturityPercentage * CompileThreshold) / 100 );
   return (current >= initial + target);
 }
 // Translate a bci to its corresponding data index (di).
 address methodDataOopDesc::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* methodDataOopDesc::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* methodDataOopDesc::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 *methodDataOopDesc::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;
 }
 #ifndef PRODUCT
 void methodDataOopDesc::print_data_on(outputStream* st) {
   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
 void methodDataOopDesc::verify_data_on(outputStream* st) {
   NEEDS_CLEANUP;
   // not yet implemented.
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/methodDataOop.cpp@8b46c4d82093 (annotated)

src/share/vm/oops/methodDataOop.cpp