hotspot/src/cpu/ppc/vm/metaspaceShared_ppc.cpp
author mdoerr
Thu, 10 Dec 2015 15:27:16 +0100
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8144847: PPC64: Update Transactional Memory and Atomic::cmpxchg code Reviewed-by: stuefe, goetz
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/*
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 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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 * Copyright 2012, 2013 SAP AG. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "asm/macroAssembler.inline.hpp"
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#include "asm/codeBuffer.hpp"
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#include "memory/metaspaceShared.hpp"
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// Generate the self-patching vtable method:
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//
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// This method will be called (as any other Klass virtual method) with
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// the Klass itself as the first argument.  Example:
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//
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//   oop obj;
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//   int size = obj->klass()->klass_part()->oop_size(this);
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//
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// for which the virtual method call is Klass::oop_size();
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//
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// The dummy method is called with the Klass object as the first
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// operand, and an object as the second argument.
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//
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//=====================================================================
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// All of the dummy methods in the vtable are essentially identical,
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// differing only by an ordinal constant, and they bear no releationship
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// to the original method which the caller intended. Also, there needs
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// to be 'vtbl_list_size' instances of the vtable in order to
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// differentiate between the 'vtable_list_size' original Klass objects.
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#define __ masm->
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void MetaspaceShared::generate_vtable_methods(void** vtbl_list,
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                                              void** vtable,
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                                              char** md_top,
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                                              char* md_end,
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                                              char** mc_top,
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                                              char* mc_end) {
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  intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*);
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  *(intptr_t *)(*md_top) = vtable_bytes;
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  *md_top += sizeof(intptr_t);
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  void** dummy_vtable = (void**)*md_top;
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  *vtable = dummy_vtable;
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  *md_top += vtable_bytes;
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  // Get ready to generate dummy methods.
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  CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top);
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  MacroAssembler* masm = new MacroAssembler(&cb);
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  // There are more general problems with CDS on ppc, so I can not
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  // really test this. But having this instead of Unimplementd() allows
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  // us to pass TestOptionsWithRanges.java.
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  __ unimplemented();
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}
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