Merge pull request #27 from ChengJin01/jep424_implement_valist_power_…

…jdk19 [JEP424] Implement VaList on Power (Linux & AIX) in JDK19
ibmruntimes · Oct 2, 2022 · b9e3daf · b9e3daf
2 parents 05db377 + aad123f
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diff --git a/src/java.base/share/classes/jdk/internal/foreign/abi/ppc64/TypeClass.java b/src/java.base/share/classes/jdk/internal/foreign/abi/ppc64/TypeClass.java
@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) 2020, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ *
+ */
+
+/*
+ * ===========================================================================
+ * (c) Copyright IBM Corp. 2022, 2022 All Rights Reserved
+ * ===========================================================================
+ */
+
+package jdk.internal.foreign.abi.ppc64;
+
+import java.lang.foreign.GroupLayout;
+import java.lang.foreign.MemoryAddress;
+import java.lang.foreign.MemoryLayout;
+import java.lang.foreign.ValueLayout;
+import static java.lang.foreign.ValueLayout.*;
+import java.lang.invoke.VarHandle;
+
+/**
+ * This class enumerates three argument types for Linux/ppc64le against the implementation
+ * of TypeClass on x64/windows as the template.
+ */
+public enum TypeClass {
+	PRIMITIVE, /* Intended for all primitive types */
+	POINTER,
+	STRUCT;
+
+	public static VarHandle classifyVarHandle(ValueLayout layout) {
+		VarHandle argHandle = null;
+		Class<?> carrier = layout.carrier();
+
+		/* According to the API Spec, all non-long integral types are promoted to long
+		 * while a float is promoted to double.
+		 */
+		if ((carrier == boolean.class)
+			|| (carrier == byte.class)
+			|| (carrier == char.class)
+			|| (carrier == short.class)
+			|| (carrier == int.class)
+		) {
+			argHandle = JAVA_LONG.varHandle();
+		} else if (carrier == float.class) {
+			argHandle = JAVA_DOUBLE.varHandle();
+		} else if ((carrier == long.class)
+			|| (carrier == double.class)
+			|| (carrier == MemoryAddress.class)
+		) {
+			argHandle = layout.varHandle();
+		} else {
+			throw new IllegalStateException("Unspported carrier: " + carrier.getName());
+		}
+
+		return argHandle;
+	}
+
+	public static TypeClass classifyLayout(MemoryLayout layout) {
+		TypeClass layoutType = null;
+
+		if (layout instanceof ValueLayout) {
+			layoutType = classifyValueType((ValueLayout)layout);
+		} else if (layout instanceof GroupLayout) {
+			layoutType = STRUCT;
+		} else {
+			throw new IllegalArgumentException("Unsupported layout: " + layout);
+		}
+
+		return layoutType;
+	}
+
+	private static TypeClass classifyValueType(ValueLayout layout) {
+		TypeClass layoutType = null;
+		Class<?> carrier = layout.carrier();
+
+		if ((carrier == boolean.class)
+			|| (carrier == byte.class)
+			|| (carrier == char.class)
+			|| (carrier == short.class)
+			|| (carrier == int.class)
+			|| (carrier == long.class)
+			|| (carrier == float.class)
+			|| (carrier == double.class)
+		) {
+			layoutType = PRIMITIVE;
+		} else if (carrier == MemoryAddress.class) {
+			layoutType = POINTER;
+		} else {
+			throw new IllegalStateException("Unspported carrier: " + carrier.getName());
+		}
+
+		return layoutType;
+	}
+}