diff src/share/vm/memory/genOopClosures.inline.hpp @ 0:a61af66fc99e

Initial load
author duke
date Sat, 01 Dec 2007 00:00:00 +0000
parents
children ba764ed4b6f2
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/memory/genOopClosures.inline.hpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,119 @@
+/*
+ * 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.
+ *
+ */
+
+inline OopsInGenClosure::OopsInGenClosure(Generation* gen) :
+  OopClosure(gen->ref_processor()), _orig_gen(gen), _rs(NULL) {
+  set_generation(gen);
+}
+
+inline void OopsInGenClosure::set_generation(Generation* gen) {
+  _gen = gen;
+  _gen_boundary = _gen->reserved().start();
+  // Barrier set for the heap, must be set after heap is initialized
+  if (_rs == NULL) {
+    GenRemSet* rs = SharedHeap::heap()->rem_set();
+    assert(rs->rs_kind() == GenRemSet::CardTable, "Wrong rem set kind");
+    _rs = (CardTableRS*)rs;
+  }
+}
+
+inline void OopsInGenClosure::do_barrier(oop* p) {
+  assert(generation()->is_in_reserved(p), "expected ref in generation");
+  oop obj = *p;
+  assert(obj != NULL, "expected non-null object");
+  // If p points to a younger generation, mark the card.
+  if ((HeapWord*)obj < _gen_boundary) {
+    _rs->inline_write_ref_field_gc(p, obj);
+  }
+}
+
+// NOTE! Any changes made here should also be made
+// in FastScanClosure::do_oop();
+inline void ScanClosure::do_oop(oop* p) {
+  oop obj = *p;
+  // Should we copy the obj?
+  if (obj != NULL) {
+    if ((HeapWord*)obj < _boundary) {
+      assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?");
+      if (obj->is_forwarded()) {
+        *p = obj->forwardee();
+      } else {
+        *p = _g->copy_to_survivor_space(obj, p);
+      }
+    }
+    if (_gc_barrier) {
+      // Now call parent closure
+      do_barrier(p);
+    }
+  }
+}
+
+inline void ScanClosure::do_oop_nv(oop* p) {
+  ScanClosure::do_oop(p);
+}
+
+// NOTE! Any changes made here should also be made
+// in ScanClosure::do_oop();
+inline void FastScanClosure::do_oop(oop* p) {
+  oop obj = *p;
+  // Should we copy the obj?
+  if (obj != NULL) {
+    if ((HeapWord*)obj < _boundary) {
+      assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?");
+      if (obj->is_forwarded()) {
+        *p = obj->forwardee();
+      } else {
+        *p = _g->copy_to_survivor_space(obj, p);
+      }
+      if (_gc_barrier) {
+        // Now call parent closure
+        do_barrier(p);
+      }
+    }
+  }
+}
+
+inline void FastScanClosure::do_oop_nv(oop* p) {
+  FastScanClosure::do_oop(p);
+}
+
+// Note similarity to ScanClosure; the difference is that
+// the barrier set is taken care of outside this closure.
+inline void ScanWeakRefClosure::do_oop(oop* p) {
+  oop obj = *p;
+  assert (obj != NULL, "null weak reference?");
+  // weak references are sometimes scanned twice; must check
+  // that to-space doesn't already contain this object
+  if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) {
+    if (obj->is_forwarded()) {
+      *p = obj->forwardee();
+    } else {
+      *p = _g->copy_to_survivor_space(obj, p);
+    }
+  }
+}
+
+inline void ScanWeakRefClosure::do_oop_nv(oop* p) {
+  ScanWeakRefClosure::do_oop(p);
+}