--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/oops/compiledICHolder.hpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 1998, 2012, 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.
+ *
+ */
+
+#ifndef SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP
+#define SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP
+
+#include "oops/oop.hpp"
+#include "utilities/macros.hpp"
+
+// A CompiledICHolder* is a helper object for the inline cache implementation.
+// It holds an intermediate value (method+klass pair) used when converting from
+// compiled to an interpreted call.
+//
+// These are always allocated in the C heap and are freed during a
+// safepoint by the ICBuffer logic. It's unsafe to free them earlier
+// since they might be in use.
+//
+
+
+class CompiledICHolder : public CHeapObj<mtCompiler> {
+ friend class VMStructs;
+ private:
+ static volatile int _live_count; // allocated
+ static volatile int _live_not_claimed_count; // allocated but not yet in use so not
+ // reachable by iterating over nmethods
+
+ Method* _holder_method;
+ Klass* _holder_klass; // to avoid name conflict with oopDesc::_klass
+ CompiledICHolder* _next;
+
+ public:
+ // Constructor
+ CompiledICHolder(Method* method, Klass* klass);
+ ~CompiledICHolder() NOT_DEBUG_RETURN;
+
+ static int live_count() { return _live_count; }
+ static int live_not_claimed_count() { return _live_not_claimed_count; }
+
+ // accessors
+ Method* holder_method() const { return _holder_method; }
+ Klass* holder_klass() const { return _holder_klass; }
+
+ void set_holder_method(Method* m) { _holder_method = m; }
+ void set_holder_klass(Klass* k) { _holder_klass = k; }
+
+ // interpreter support (offsets in bytes)
+ static int holder_method_offset() { return offset_of(CompiledICHolder, _holder_method); }
+ static int holder_klass_offset() { return offset_of(CompiledICHolder, _holder_klass); }
+
+ CompiledICHolder* next() { return _next; }
+ void set_next(CompiledICHolder* n) { _next = n; }
+
+ // Verify
+ void verify_on(outputStream* st);
+
+ // Printing
+ void print_on(outputStream* st) const;
+ void print_value_on(outputStream* st) const;
+
+ const char* internal_name() const { return "{compiledICHolder}"; }
+
+ void claim() NOT_DEBUG_RETURN;
+};
+
+#endif // SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP