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Merge pull request #155 from ChengJin01/jep389_implement_valist_power_zlinux_jdk17
[JEP389/412]Implement VaList on Power and zLinux in JDK17
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‎src/jdk.incubator.foreign/share/classes/jdk/internal/foreign/abi/ppc64/TypeClass.java‎

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/*
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* Copyright (c) 2020, 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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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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* ===========================================================================
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* (c) Copyright IBM Corp. 2022, 2022 All Rights Reserved
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* ===========================================================================
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*/
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package jdk.internal.foreign.abi.ppc64;
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import java.lang.invoke.VarHandle;
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import jdk.incubator.foreign.CLinker.TypeKind;
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import jdk.incubator.foreign.GroupLayout;
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import jdk.incubator.foreign.MemoryAddress;
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import jdk.incubator.foreign.MemoryLayout;
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import jdk.incubator.foreign.MemorySegment;
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import jdk.incubator.foreign.ValueLayout;
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import jdk.internal.foreign.abi.SharedUtils;
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import static jdk.incubator.foreign.CLinker.*;
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import static jdk.incubator.foreign.CLinker.TypeKind.*;
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/**
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* This class enumerates three argument types for Linux/ppc64le, in which case the code
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* is backported from OpenJDK19 with modifications against the implementation of TypeClass
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* on x64/windows as the template.
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*/
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public enum TypeClass {
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PRIMITIVE, /* Intended for all primitive types */
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POINTER,
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STRUCT;
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private static String osName = System.getProperty("os.name").toLowerCase();
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/* long long is 64 bits on AIX/ppc64, which is the same as Windows */
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private static ValueLayout longLayout = osName.contains("aix") ? C_LONG_LONG : C_LONG;
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public static VarHandle classifyVarHandle(ValueLayout layout) {
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VarHandle argHandle = null;
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Class<?> carrier = classifyCarrier(layout);
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/* According to the API Spec, all non-long integral types are promoted to long
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* while a float is promoted to double.
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*/
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if ((carrier == byte.class)
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|| (carrier == short.class)
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|| (carrier == int.class)
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|| (carrier == long.class)
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) {
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argHandle = SharedUtils.vhPrimitiveOrAddress(long.class, longLayout);
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} else if (carrier == float.class) {
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argHandle = SharedUtils.vhPrimitiveOrAddress(double.class, C_DOUBLE);
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} else if ((carrier == double.class)
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|| (carrier == MemoryAddress.class)
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) {
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argHandle = SharedUtils.vhPrimitiveOrAddress(carrier, layout);
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} else {
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throw new IllegalStateException("Unspported carrier: " + carrier.getName());
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}
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return argHandle;
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}
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public static Class<?> classifyCarrier(MemoryLayout layout) {
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Class<?> carrier = null;
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if (layout instanceof ValueLayout) {
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carrier = classifyValueLayoutCarrier((ValueLayout)layout);
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} else if (layout instanceof GroupLayout) {
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carrier = MemorySegment.class;
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} else {
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throw new IllegalArgumentException("Unsupported layout: " + layout);
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}
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return carrier;
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}
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private static Class<?> classifyValueLayoutCarrier(ValueLayout layout) {
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Class<?> carrier = null;
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/* Extract the kind from the specified layout with the ATTR_NAME "abi/kind".
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* e.g. b32[abi/kind=INT]
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*/
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TypeKind kind = (TypeKind)layout.attribute(TypeKind.ATTR_NAME)
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.orElseThrow(() -> new IllegalArgumentException("The layout's ABI class is empty"));
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switch (kind) {
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case CHAR:
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carrier = byte.class;
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break;
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case SHORT:
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carrier = short.class;
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break;
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case INT:
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carrier = int.class;
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break;
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case LONG: /* Fall through */
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case LONG_LONG:
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carrier = long.class;
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break;
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case FLOAT:
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carrier = float.class;
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break;
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case DOUBLE:
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carrier = double.class;
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break;
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case POINTER:
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carrier = MemoryAddress.class;
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break;
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default:
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throw new IllegalArgumentException("The layout's ABI Class is undefined: layout = " + layout);
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}
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return carrier;
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}
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public static TypeClass classifyLayout(MemoryLayout layout) {
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TypeClass layoutType = PRIMITIVE;
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if (layout instanceof ValueLayout) {
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layoutType = classifyValueType((ValueLayout)layout);
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} else if (layout instanceof GroupLayout) {
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layoutType = STRUCT;
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} else {
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throw new IllegalArgumentException("Unsupported layout: " + layout);
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}
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return layoutType;
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}
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private static TypeClass classifyValueType(ValueLayout layout) {
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TypeClass layoutType = null;
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/* Extract the kind from the specified layout with the ATTR_NAME "abi/kind".
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* e.g. b32[abi/kind=INT]
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*/
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TypeKind kind = (TypeKind)layout.attribute(TypeKind.ATTR_NAME)
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.orElseThrow(() -> new IllegalArgumentException("The layout's ABI class is empty"));
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switch (kind) {
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case CHAR: /* Fall through */
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case SHORT: /* Fall through */
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case INT: /* Fall through */
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case LONG: /* Fall through */
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case LONG_LONG: /* Fall through */
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case FLOAT: /* Fall through */
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case DOUBLE:
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layoutType = PRIMITIVE;
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break;
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case POINTER:
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layoutType = POINTER;
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break;
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default:
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throw new IllegalArgumentException("The layout's ABI Class is undefined: layout = " + layout);
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}
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return layoutType;
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}
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}

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