--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/runtime/javaFrameAnchor.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,87 @@
+/*
+ * Copyright 2002-2005 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.
+ *
+ */
+//
+// An object for encapsulating the machine/os dependent part of a JavaThread frame state
+//
+class JavaThread;
+
+class JavaFrameAnchor VALUE_OBJ_CLASS_SPEC {
+// Too many friends...
+friend class CallNativeDirectNode;
+friend class OptoRuntime;
+friend class Runtime1;
+friend class StubAssembler;
+friend class CallRuntimeDirectNode;
+friend class MacroAssembler;
+friend class InterpreterGenerator;
+friend class LIR_Assembler;
+friend class GraphKit;
+friend class StubGenerator;
+friend class JavaThread;
+friend class frame;
+friend class VMStructs;
+friend class BytecodeInterpreter;
+friend class JavaCallWrapper;
+
+ private:
+ //
+ // Whenever _last_Java_sp != NULL other anchor fields MUST be valid!
+ // The stack may not be walkable [check with walkable() ] but the values must be valid.
+ // The profiler apparently depends on this.
+ //
+ intptr_t* volatile _last_Java_sp;
+
+ // Whenever we call from Java to native we can not be assured that the return
+ // address that composes the last_Java_frame will be in an accessible location
+ // so calls from Java to native store that pc (or one good enough to locate
+ // the oopmap) in the frame anchor. Since the frames that call from Java to
+ // native are never deoptimized we never need to patch the pc and so this
+ // is acceptable.
+ volatile address _last_Java_pc;
+
+ // tells whether the last Java frame is set
+ // It is important that when last_Java_sp != NULL that the rest of the frame
+ // anchor (including platform specific) all be valid.
+
+ bool has_last_Java_frame() const { return _last_Java_sp != NULL; }
+ // This is very dangerous unless sp == NULL
+ // Invalidate the anchor so that has_last_frame is false
+ // and no one should look at the other fields.
+ void zap(void) { _last_Java_sp = NULL; }
+
+#include "incls/_javaFrameAnchor_pd.hpp.incl"
+
+public:
+ JavaFrameAnchor() { clear(); }
+ JavaFrameAnchor(JavaFrameAnchor *src) { copy(src); }
+
+ address last_Java_pc(void) { return _last_Java_pc; }
+ void set_last_Java_pc(address pc) { _last_Java_pc = pc; }
+
+ // Assembly stub generation helpers
+
+ static ByteSize last_Java_sp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_sp); }
+ static ByteSize last_Java_pc_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_pc); }
+
+};