src/hotspot/cpu/x86/relocInfo_x86.hpp
author goetz
Thu, 21 Dec 2017 09:05:32 +0100
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child 53244 9807daeb47c4
permissions -rw-r--r--
8193927: Optimize scanning code for oops. Reviewed-by: simonis, mdoerr, aph
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/*
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 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. 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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#ifndef CPU_X86_VM_RELOCINFO_X86_HPP
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#define CPU_X86_VM_RELOCINFO_X86_HPP
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  // machine-dependent parts of class relocInfo
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 private:
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  enum {
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    // Intel instructions are byte-aligned.
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    offset_unit        =  1,
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    // Encodes Assembler::disp32_operand vs. Assembler::imm32_operand.
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#ifndef AMD64
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    format_width       =  1
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#else
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    // vs Assembler::narrow_oop_operand.
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    format_width       =  2
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#endif
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  };
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 public:
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  // Instruct loadConP of x86_64.ad places oops in code that are not also
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  // listed in the oop section.
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  static bool mustIterateImmediateOopsInCode() { return true; }
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#endif // CPU_X86_VM_RELOCINFO_X86_HPP