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hotspot/src/share/vm/ci/ciMethodData.cpp

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+/*
+ * Copyright 2001-2007 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/_ciMethodData.cpp.incl"
+
+// 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;
+  _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();
+}
+
+// ------------------------------------------------------------------
+// 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;
+  _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();
+}
+
+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());
+  _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);
+  };
+}
+
+// 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->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();
+  _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);
+  }
+}
+
+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);
+}
+
+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);
+}
+
+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);
+}
+
+// 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);
+  }
+}
+
+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