Add riscv64 support

Signed-off-by: Kai Zhang <zhangkai@iscas.ac.cn>

src/main/java/jnr/ffi/Platform.java

@@ -130,6 +130,9 @@ public enum CPU {
         /** 64 bit LOONGARCH */
         LOONGARCH64,
 
+        /** 64 bit RISC-V */
+        RISCV64,
+
         /**
          * Unknown CPU architecture.  A best effort will be made to infer architecture
          * specific values such as address and long size.
@@ -246,6 +249,8 @@ private static CPU determineCPU() {
             return CPU.MIPS64EL;
         } else if (equalsIgnoreCase("loongarch64", archString)) {
            return CPU.LOONGARCH64;
+        } else if (equalsIgnoreCase("riscv64", archString)) {
+           return CPU.RISCV64;
         }
 
         // Try to find by lookup up in the CPU list
@@ -308,6 +313,7 @@ private static int calculateAddressSize(CPU cpu) {
                 case AARCH64:
 		case MIPS64EL:
 		case LOONGARCH64:
+        case RISCV64:
                     dataModel = 64;
                     break;
                 default:

src/main/java/jnr/ffi/provider/jffi/platform/riscv64/linux/TypeAliases.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2016 Wayne Meissner
+ *
+ * This file is part of the JNR project.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jnr.ffi.provider.jffi.platform.riscv64.linux;
+
+import jnr.ffi.NativeType;
+import jnr.ffi.TypeAlias;
+
+import java.util.EnumMap;
+import java.util.Map;
+
+public final class TypeAliases {
+    public static final Map<TypeAlias, jnr.ffi.NativeType> ALIASES = buildTypeMap();
+    private static Map<TypeAlias, jnr.ffi.NativeType> buildTypeMap() {
+        Map<TypeAlias, jnr.ffi.NativeType> m = new EnumMap<TypeAlias, jnr.ffi.NativeType>(TypeAlias.class);
+        m.put(TypeAlias.int8_t, NativeType.SCHAR);
+        m.put(TypeAlias.u_int8_t, NativeType.UCHAR);
+        m.put(TypeAlias.int16_t, NativeType.SSHORT);
+        m.put(TypeAlias.u_int16_t, NativeType.USHORT);
+        m.put(TypeAlias.int32_t, NativeType.SINT);
+        m.put(TypeAlias.u_int32_t, NativeType.UINT);
+        m.put(TypeAlias.int64_t, NativeType.SLONG);
+        m.put(TypeAlias.u_int64_t, NativeType.ULONG);
+        m.put(TypeAlias.intptr_t, NativeType.SLONG);
+        m.put(TypeAlias.uintptr_t, NativeType.ULONG);
+        m.put(TypeAlias.caddr_t, NativeType.ADDRESS);
+        m.put(TypeAlias.dev_t, NativeType.ULONG);
+        m.put(TypeAlias.blkcnt_t, NativeType.SLONG);
+        m.put(TypeAlias.blksize_t, NativeType.SINT);
+        m.put(TypeAlias.gid_t, NativeType.UINT);
+        m.put(TypeAlias.in_addr_t, NativeType.UINT);
+        m.put(TypeAlias.in_port_t, NativeType.USHORT);
+        m.put(TypeAlias.ino_t, NativeType.ULONG);
+        m.put(TypeAlias.ino64_t, NativeType.ULONG);
+        m.put(TypeAlias.key_t, NativeType.SINT);
+        m.put(TypeAlias.mode_t, NativeType.UINT);
+        m.put(TypeAlias.nlink_t, NativeType.UINT);
+        m.put(TypeAlias.id_t, NativeType.UINT);
+        m.put(TypeAlias.pid_t, NativeType.SINT);
+        m.put(TypeAlias.off_t, NativeType.SLONG);
+        m.put(TypeAlias.swblk_t, NativeType.SLONG);
+        m.put(TypeAlias.uid_t, NativeType.UINT);
+        m.put(TypeAlias.clock_t, NativeType.SLONG);
+        m.put(TypeAlias.size_t, NativeType.ULONG);
+        m.put(TypeAlias.ssize_t, NativeType.SLONG);
+        m.put(TypeAlias.time_t, NativeType.SLONG);
+        m.put(TypeAlias.fsblkcnt_t, NativeType.ULONG);
+        m.put(TypeAlias.fsfilcnt_t, NativeType.ULONG);
+        m.put(TypeAlias.sa_family_t, NativeType.USHORT);
+        m.put(TypeAlias.socklen_t, NativeType.UINT);
+        m.put(TypeAlias.rlim_t, NativeType.ULONG);
+        m.put(TypeAlias.cc_t, NativeType.UCHAR);
+        m.put(TypeAlias.speed_t, NativeType.UINT);
+        m.put(TypeAlias.tcflag_t, NativeType.UINT);
+        return m;
+    }
+}