Add regression and unit tests

sulong/projects/com.oracle.truffle.llvm.runtime/src/com/oracle/truffle/llvm/runtime/LLVMIVarBitSmall.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, 2019, Oracle and/or its affiliates.
+ * Copyright (c) 2016, 2021, Oracle and/or its affiliates.
  *
  * All rights reserved.
  *
@@ -49,14 +49,14 @@ public final class LLVMIVarBitSmall extends LLVMIVarBit {
     private final int bits;
     private final long value;
 
-    LLVMIVarBitSmall(int bits, long value) {
+    public LLVMIVarBitSmall(int bits, long value) {
         this.bits = bits;
         this.value = value;
 
         assert bits <= MAX_SIZE;
     }
 
-    LLVMIVarBitSmall(int bits, byte[] arr, int arrBits, boolean signExtend) {
+    public LLVMIVarBitSmall(int bits, byte[] arr, int arrBits, boolean signExtend) {
         this.bits = bits;
 
         long v = 0;

sulong/tests/com.oracle.truffle.llvm.tests.sulong.native/c/struct/packed/packed-signed-int.c

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2017, 2021, Oracle and/or its affiliates.
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors may be used to
+ * endorse or promote products derived from this software without specific prior written
+ * permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#pragma pack(1)
+struct {
+    int v : 30;
+    int : 4;
+} c = { -1 };
+
+int main() {
+    return c.v != -1;
+}

sulong/tests/com.oracle.truffle.llvm.tests/src/com/oracle/truffle/llvm/tests/runtime/LLVMIVarBitSmallTest.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2017, 2021, Oracle and/or its affiliates.
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors may be used to
+ * endorse or promote products derived from this software without specific prior written
+ * permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.oracle.truffle.llvm.tests.runtime;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+import com.oracle.truffle.llvm.runtime.LLVMIVarBitSmall;
+
+public class LLVMIVarBitSmallTest {
+    @Test
+    public void unpackUnsignedLong() {
+        LLVMIVarBitSmall v = new LLVMIVarBitSmall(40, 0x00FF_FFFF_FF00L);
+        assertEquals(0x00FF_FFFF_FF00L, v.getZeroExtendedLongValue());
+    }
+
+    @Test
+    public void unpackSignedLong() {
+        LLVMIVarBitSmall v = new LLVMIVarBitSmall(40, 0x00FF_FFFF_FF00L);
+
+        assertTrue("v.getLongValue() is negative", v.getLongValue() < 0);
+        assertEquals(0xFFFF_FFFF_FFFF_FF00L, v.getLongValue());
+    }
+
+    @Test
+    public void arithMeticShiftRight() {
+        LLVMIVarBitSmall v = new LLVMIVarBitSmall(40, 0x00FF_FFFF_FC00L).arithmeticRightShift(new LLVMIVarBitSmall(32, 10));
+        assertEquals(-1L, v.getLongValue());
+    }
+}