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

 /*

  * Copyright (c) 2001, 2010, 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 "ci/ciMethodData.hpp"

 #include "ci/ciUtilities.hpp"

 #include "memory/allocation.inline.hpp"

 #include "memory/resourceArea.hpp"

 #include "runtime/deoptimization.hpp"

 #include "utilities/copy.hpp"

 // ciMethodData

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

 // ciMethodData::ciMethodData

 //

 ciMethodData::ciMethodData(methodDataHandle h_md) : ciObject(h_md) {

   assert(h_md() != NULL, "no null method data");

   Copy::zero_to_words((HeapWord*) &_orig, sizeof(_orig) / sizeof(HeapWord));

   _data = NULL;

   _data_size = 0;

   _extra_data_size = 0;

   _current_mileage = 0;

   _invocation_counter = 0;

   _backedge_counter = 0;

   _state = empty_state;

   _saw_free_extra_data = false;

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

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

   _hint_di = first_di();

   // Initialize the escape information (to "don't know.");

   _eflags = _arg_local = _arg_stack = _arg_returned = 0;

 }

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

 // ciMethodData::ciMethodData

 //

 // No methodDataOop.

 ciMethodData::ciMethodData() : ciObject() {

   Copy::zero_to_words((HeapWord*) &_orig, sizeof(_orig) / sizeof(HeapWord));

   _data = NULL;

   _data_size = 0;

   _extra_data_size = 0;

   _current_mileage = 0;

   _invocation_counter = 0;

   _backedge_counter = 0;

   _state = empty_state;

   _saw_free_extra_data = false;

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

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

   _hint_di = first_di();

   // Initialize the escape information (to "don't know.");

   _eflags = _arg_local = _arg_stack = _arg_returned = 0;

 }

 void ciMethodData::load_data() {

   methodDataOop mdo = get_methodDataOop();

   if (mdo == NULL) return;

   // To do: don't copy the data if it is not "ripe" -- require a minimum #

   // of invocations.

   // Snapshot the data -- actually, take an approximate snapshot of

   // the data.  Any concurrently executing threads may be changing the

   // data as we copy it.

   int skip_header = oopDesc::header_size();

   Copy::disjoint_words((HeapWord*) mdo              + skip_header,

                        (HeapWord*) &_orig           + skip_header,

                        sizeof(_orig) / HeapWordSize - skip_header);

   DEBUG_ONLY(*_orig.adr_method() = NULL);  // no dangling oops, please

   Arena* arena = CURRENT_ENV->arena();

   _data_size = mdo->data_size();

   _extra_data_size = mdo->extra_data_size();

   int total_size = _data_size + _extra_data_size;

   _data = (intptr_t *) arena->Amalloc(total_size);

   Copy::disjoint_words((HeapWord*) mdo->data_base(), (HeapWord*) _data, total_size / HeapWordSize);

   // Traverse the profile data, translating any oops into their

   // ci equivalents.

   ResourceMark rm;

   ciProfileData* ci_data = first_data();

   ProfileData* data = mdo->first_data();

   while (is_valid(ci_data)) {

     ci_data->translate_from(data);

     ci_data = next_data(ci_data);

     data = mdo->next_data(data);

   }

   // Note:  Extra data are all BitData, and do not need translation.

   _current_mileage = methodDataOopDesc::mileage_of(mdo->method());

   _invocation_counter = mdo->invocation_count();

   _backedge_counter = mdo->backedge_count();

   _state = mdo->is_mature()? mature_state: immature_state;

   _eflags = mdo->eflags();

   _arg_local = mdo->arg_local();

   _arg_stack = mdo->arg_stack();

   _arg_returned  = mdo->arg_returned();

 }

 void ciReceiverTypeData::translate_receiver_data_from(ProfileData* data) {

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

     klassOop k = data->as_ReceiverTypeData()->receiver(row);

     if (k != NULL) {

       ciKlass* klass = CURRENT_ENV->get_object(k)->as_klass();

       set_receiver(row, klass);

     }

   }

 }

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

 ciProfileData* ciMethodData::data_at(int data_index) {

   if (out_of_bounds(data_index)) {

     return NULL;

   }

   DataLayout* data_layout = data_layout_at(data_index);

   switch (data_layout->tag()) {

   case DataLayout::no_tag:

   default:

     ShouldNotReachHere();

     return NULL;

   case DataLayout::bit_data_tag:

     return new ciBitData(data_layout);

   case DataLayout::counter_data_tag:

     return new ciCounterData(data_layout);

   case DataLayout::jump_data_tag:

     return new ciJumpData(data_layout);

   case DataLayout::receiver_type_data_tag:

     return new ciReceiverTypeData(data_layout);

   case DataLayout::virtual_call_data_tag:

     return new ciVirtualCallData(data_layout);

   case DataLayout::ret_data_tag:

     return new ciRetData(data_layout);

   case DataLayout::branch_data_tag:

     return new ciBranchData(data_layout);

   case DataLayout::multi_branch_data_tag:

     return new ciMultiBranchData(data_layout);

   case DataLayout::arg_info_data_tag:

     return new ciArgInfoData(data_layout);

   };

 }

 // Iteration over data.

 ciProfileData* ciMethodData::next_data(ciProfileData* current) {

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

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

   ciProfileData* next = data_at(next_index);

   return next;

 }

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

 ciProfileData* ciMethodData::bci_to_data(int bci) {

   ciProfileData* 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;

     }

   }

   // bci_to_extra_data(bci) ...

   DataLayout* dp  = data_layout_at(data_size());

   DataLayout* end = data_layout_at(data_size() + extra_data_size());

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

     if (dp->tag() == DataLayout::no_tag) {

       _saw_free_extra_data = true;  // observed an empty slot (common case)

       return NULL;

     }

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

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

     }

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

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

       return new ciBitData(dp);

     }

   }

   return NULL;

 }

 // Conservatively decode the trap_state of a ciProfileData.

 int ciMethodData::has_trap_at(ciProfileData* data, int reason) {

   typedef Deoptimization::DeoptReason DR_t;

   int per_bc_reason

     = Deoptimization::reason_recorded_per_bytecode_if_any((DR_t) reason);

   if (trap_count(reason) == 0) {

     // Impossible for this trap to have occurred, regardless of trap_state.

     // Note:  This happens if the MDO is empty.

     return 0;

   } else if (per_bc_reason == Deoptimization::Reason_none) {

     // We cannot conclude anything; a trap happened somewhere, maybe here.

     return -1;

   } else if (data == NULL) {

     // No profile here, not even an extra_data record allocated on the fly.

     // If there are empty extra_data records, and there had been a trap,

     // there would have been a non-null data pointer.  If there are no

     // free extra_data records, we must return a conservative -1.

     if (_saw_free_extra_data)

       return 0;                 // Q.E.D.

     else

       return -1;                // bail with a conservative answer

   } else {

     return Deoptimization::trap_state_has_reason(data->trap_state(), per_bc_reason);

   }

 }

 int ciMethodData::trap_recompiled_at(ciProfileData* data) {

   if (data == NULL) {

     return (_saw_free_extra_data? 0: -1);  // (see previous method)

   } else {

     return Deoptimization::trap_state_is_recompiled(data->trap_state())? 1: 0;

   }

 }

 void ciMethodData::clear_escape_info() {

   VM_ENTRY_MARK;

   methodDataOop mdo = get_methodDataOop();

   if (mdo != NULL) {

     mdo->clear_escape_info();

     ArgInfoData *aid = arg_info();

     int arg_count = (aid == NULL) ? 0 : aid->number_of_args();

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

       set_arg_modified(i, 0);

     }

   }

   _eflags = _arg_local = _arg_stack = _arg_returned = 0;

 }

 // copy our escape info to the methodDataOop if it exists

 void ciMethodData::update_escape_info() {

   VM_ENTRY_MARK;

   methodDataOop mdo = get_methodDataOop();

   if ( mdo != NULL) {

     mdo->set_eflags(_eflags);

     mdo->set_arg_local(_arg_local);

     mdo->set_arg_stack(_arg_stack);

     mdo->set_arg_returned(_arg_returned);

     int arg_count = mdo->method()->size_of_parameters();

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

       mdo->set_arg_modified(i, arg_modified(i));

     }

   }

 }

 void ciMethodData::set_compilation_stats(short loops, short blocks) {

   VM_ENTRY_MARK;

   methodDataOop mdo = get_methodDataOop();

   if (mdo != NULL) {

     mdo->set_num_loops(loops);

     mdo->set_num_blocks(blocks);

   }

 }

 void ciMethodData::set_would_profile(bool p) {

   VM_ENTRY_MARK;

   methodDataOop mdo = get_methodDataOop();

   if (mdo != NULL) {

     mdo->set_would_profile(p);

   }

 }

 bool ciMethodData::has_escape_info() {

   return eflag_set(methodDataOopDesc::estimated);

 }

 void ciMethodData::set_eflag(methodDataOopDesc::EscapeFlag f) {

   set_bits(_eflags, f);

 }

 void ciMethodData::clear_eflag(methodDataOopDesc::EscapeFlag f) {

   clear_bits(_eflags, f);

 }

 bool ciMethodData::eflag_set(methodDataOopDesc::EscapeFlag f) const {

   return mask_bits(_eflags, f) != 0;

 }

 void ciMethodData::set_arg_local(int i) {

   set_nth_bit(_arg_local, i);

 }

 void ciMethodData::set_arg_stack(int i) {

   set_nth_bit(_arg_stack, i);

 }

 void ciMethodData::set_arg_returned(int i) {

   set_nth_bit(_arg_returned, i);

 }

 void ciMethodData::set_arg_modified(int arg, uint val) {

   ArgInfoData *aid = arg_info();

   if (aid == NULL)

     return;

   assert(arg >= 0 && arg < aid->number_of_args(), "valid argument number");

   aid->set_arg_modified(arg, val);

 }

 bool ciMethodData::is_arg_local(int i) const {

   return is_set_nth_bit(_arg_local, i);

 }

 bool ciMethodData::is_arg_stack(int i) const {

   return is_set_nth_bit(_arg_stack, i);

 }

 bool ciMethodData::is_arg_returned(int i) const {

   return is_set_nth_bit(_arg_returned, i);

 }

 uint ciMethodData::arg_modified(int arg) const {

   ArgInfoData *aid = arg_info();

   if (aid == NULL)

     return 0;

   assert(arg >= 0 && arg < aid->number_of_args(), "valid argument number");

   return aid->arg_modified(arg);

 }

 ByteSize ciMethodData::offset_of_slot(ciProfileData* data, ByteSize slot_offset_in_data) {

   // Get offset within methodDataOop of the data array

   ByteSize data_offset = methodDataOopDesc::data_offset();

   // Get cell offset of the ProfileData within data array

   int cell_offset = dp_to_di(data->dp());

   // Add in counter_offset, the # of bytes into the ProfileData of counter or flag

   int offset = in_bytes(data_offset) + cell_offset + in_bytes(slot_offset_in_data);

   return in_ByteSize(offset);

 }

 ciArgInfoData *ciMethodData::arg_info() const {

   // Should be last, have to skip all traps.

   DataLayout* dp  = data_layout_at(data_size());

   DataLayout* end = data_layout_at(data_size() + extra_data_size());

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

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

       return new ciArgInfoData(dp);

   }

   return NULL;

 }

 // Implementation of the print method.

 void ciMethodData::print_impl(outputStream* st) {

   ciObject::print_impl(st);

 }

 #ifndef PRODUCT

 void ciMethodData::print() {

   print_data_on(tty);

 }

 void ciMethodData::print_data_on(outputStream* st) {

   ResourceMark rm;

   ciProfileData* data;

   for (data = first_data(); 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  = data_layout_at(data_size());

   DataLayout* end = data_layout_at(data_size() + extra_data_size());

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

     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 ciArgInfoData(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);

   }

 }

 void ciReceiverTypeData::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_name_on(st);

       st->print_cr("(%u)", receiver_count(row));

     }

   }

 }

 void ciReceiverTypeData::print_data_on(outputStream* st) {

   print_shared(st, "ciReceiverTypeData");

   print_receiver_data_on(st);

 }

 void ciVirtualCallData::print_data_on(outputStream* st) {

   print_shared(st, "ciVirtualCallData");

   rtd_super()->print_receiver_data_on(st);

 }

 #endif