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hotspot/src/share/vm/code/oopRecorder.cpp

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+/*
+ * Copyright 1998-2007 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/_oopRecorder.cpp.incl"
+
+#ifdef ASSERT
+int OopRecorder::_find_index_calls = 0;
+int OopRecorder::_hit_indexes      = 0;
+int OopRecorder::_missed_indexes   = 0;
+#endif //ASSERT
+
+
+OopRecorder::OopRecorder(Arena* arena) {
+  _handles  = NULL;
+  _indexes  = NULL;
+  _arena    = arena;
+  _complete = false;
+}
+
+OopRecorder::IndexCache::IndexCache() {
+  assert(first_index > 0, "initial zero state of cache must be invalid index");
+  Copy::zero_to_bytes(&_cache[0], sizeof(_cache));
+}
+
+int OopRecorder::oop_size() {
+  _complete = true;
+  if (_handles == NULL)  return 0;
+  return _handles->length() * sizeof(oop);
+}
+
+void OopRecorder::copy_to(CodeBlob* code) {
+  assert(_complete, "must be frozen");
+  maybe_initialize();  // get non-null handles, even if we have no oops
+  code->copy_oops(_handles);
+}
+
+void OopRecorder::maybe_initialize() {
+  if (_handles == NULL) {
+    if (_arena != NULL) {
+      _handles  = new(_arena) GrowableArray<jobject>(_arena, 10, 0, 0);
+      _no_finds = new(_arena) GrowableArray<int>(    _arena, 10, 0, 0);
+    } else {
+      _handles  = new GrowableArray<jobject>(10, 0, 0);
+      _no_finds = new GrowableArray<int>(    10, 0, 0);
+    }
+  }
+}
+
+
+jobject OopRecorder::handle_at(int index) {
+  // there is always a NULL virtually present as first object
+  if (index == null_index)  return NULL;
+  return _handles->at(index - first_index);
+}
+
+
+// Local definition.  Used only in this module.
+inline bool OopRecorder::is_real_jobject(jobject h) {
+  return h != NULL && h != (jobject)Universe::non_oop_word();
+}
+
+
+int OopRecorder::add_handle(jobject h, bool make_findable) {
+  assert(!_complete, "cannot allocate more elements after size query");
+  maybe_initialize();
+  // indexing uses 1 as an origin--0 means null
+  int index = _handles->length() + first_index;
+  _handles->append(h);
+
+  // Support correct operation of find_index().
+  assert(!(make_findable && !is_real_jobject(h)), "nulls are not findable");
+  if (make_findable) {
+    // This index may be returned from find_index().
+    if (_indexes != NULL) {
+      int* cloc = _indexes->cache_location(h);
+      _indexes->set_cache_location_index(cloc, index);
+    } else if (index == index_cache_threshold && _arena != NULL) {
+      _indexes = new(_arena) IndexCache();
+      for (int i = 0; i < _handles->length(); i++) {
+        // Load the cache with pre-existing elements.
+        int index0 = i + first_index;
+        if (_no_finds->contains(index0))  continue;
+        int* cloc = _indexes->cache_location(_handles->at(i));
+        _indexes->set_cache_location_index(cloc, index0);
+      }
+    }
+  } else if (is_real_jobject(h)) {
+    // Remember that this index is not to be returned from find_index().
+    // This case is rare, because most or all uses of allocate_index pass
+    // a jobject argument of NULL or Universe::non_oop_word.
+    // Thus, the expected length of _no_finds is zero.
+    _no_finds->append(index);
+  }
+
+  return index;
+}
+
+
+int OopRecorder::maybe_find_index(jobject h) {
+  debug_only(_find_index_calls++);
+  assert(!_complete, "cannot allocate more elements after size query");
+  maybe_initialize();
+  if (h == NULL)  return null_index;
+  assert(is_real_jobject(h), "must be valid jobject");
+  int* cloc = (_indexes == NULL)? NULL: _indexes->cache_location(h);
+  if (cloc != NULL) {
+    int cindex = _indexes->cache_location_index(cloc);
+    if (cindex == 0) {
+      return -1;   // We know this handle is completely new.
+    }
+    if (cindex >= first_index && _handles->at(cindex - first_index) == h) {
+      debug_only(_hit_indexes++);
+      return cindex;
+    }
+    if (!_indexes->cache_location_collision(cloc)) {
+      return -1;   // We know the current cache occupant is unique to that cloc.
+    }
+  }
+
+  // Not found in cache, due to a cache collision.  (Or, no cache at all.)
+  // Do a linear search, most recent to oldest.
+  for (int i = _handles->length() - 1; i >= 0; i--) {
+    if (_handles->at(i) == h) {
+      int findex = i + first_index;
+      if (_no_finds->contains(findex))  continue;  // oops; skip this one
+      if (cloc != NULL) {
+        _indexes->set_cache_location_index(cloc, findex);
+      }
+      debug_only(_missed_indexes++);
+      return findex;
+    }
+  }
+  return -1;
+}