Minor refactorings and preparations.

compiler/src/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/util/UnsafeArrayTypeWriter.java

@@ -116,6 +116,11 @@ public final ByteBuffer toByteBuffer(ByteBuffer buffer) {
         return buffer;
     }
 
+    public final byte[] toArray() {
+        byte[] result = new byte[TypeConversion.asS4(getBytesWritten())];
+        return toArray(result);
+    }
+
     @Override
     public final void putS1(long value) {
         long offset = writeOffset(Byte.BYTES);

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/StaticFieldsSupport.java

@@ -30,6 +30,7 @@
 import org.graalvm.nativeimage.Platforms;
 
 import com.oracle.svm.core.annotate.AutomaticFeature;
+import com.oracle.svm.core.annotate.Uninterruptible;
 import com.oracle.svm.core.annotate.UnknownObjectField;
 import com.oracle.svm.core.meta.SharedField;
 
@@ -58,12 +59,14 @@ public static void setData(Object[] staticObjectFields, byte[] staticPrimitiveFi
         support.staticPrimitiveFields = staticPrimitiveFields;
     }
 
+    @Uninterruptible(reason = "Called from uninterruptible code.", mayBeInlined = true)
     public static Object[] getStaticObjectFields() {
         Object[] result = ImageSingletons.lookup(StaticFieldsSupport.class).staticObjectFields;
         assert result != null;
         return result;
     }
 
+    @Uninterruptible(reason = "Called from uninterruptible code.", mayBeInlined = true)
     public static byte[] getStaticPrimitiveFields() {
         byte[] result = ImageSingletons.lookup(StaticFieldsSupport.class).staticPrimitiveFields;
         assert result != null;

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/c/NonmovableArrays.java

@@ -346,7 +346,14 @@ public static <T extends WordBase> T getWord(NonmovableArray<T> array, int index
     @Uninterruptible(reason = "Called from uninterruptible code.", mayBeInlined = true)
     public static <T extends PointerBase> T addressOf(NonmovableArray<?> array, int index) {
         assert index >= 0 && index <= lengthOf(array);
-        return (T) ((Pointer) array).add(readArrayBase(array) + (index << readElementShift(array)));
+        return (T) getArrayBase(array).add(index << readElementShift(array));
+    }
+
+    /** Reads the value at the given index in an object array. */
+    @SuppressWarnings("unchecked")
+    @Uninterruptible(reason = "Called from uninterruptible code.", mayBeInlined = true)
+    public static <T extends Pointer> T getArrayBase(NonmovableArray<?> array) {
+        return (T) ((Pointer) array).add(readArrayBase(array));
     }
 
     /** Reads the value at the given index in an object array. */

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/c/Target_org_graalvm_nativeimage_c_function_CEntryPointLiteral.java

@@ -30,13 +30,15 @@
 import com.oracle.svm.core.annotate.Alias;
 import com.oracle.svm.core.annotate.Substitute;
 import com.oracle.svm.core.annotate.TargetClass;
+import com.oracle.svm.core.annotate.Uninterruptible;
 
 @TargetClass(CEntryPointLiteral.class)
 final class Target_org_graalvm_nativeimage_c_function_CEntryPointLiteral {
 
     @Alias protected CFunctionPointer functionPointer;
 
     @Substitute
+    @Uninterruptible(reason = "Called from uninterruptible code.", mayBeInlined = true)
     public CFunctionPointer getFunctionPointer() {
         return functionPointer;
     }

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/hub/DynamicHubSupport.java

@@ -30,6 +30,7 @@
 import org.graalvm.nativeimage.hosted.Feature;
 
 import com.oracle.svm.core.annotate.AutomaticFeature;
+import com.oracle.svm.core.annotate.Uninterruptible;
 import com.oracle.svm.core.annotate.UnknownObjectField;
 import com.oracle.svm.core.c.NonmovableArray;
 import com.oracle.svm.core.c.NonmovableArrays;
@@ -47,6 +48,7 @@ public void setData(NonmovableArray<Byte> referenceMapEncoding) {
         this.referenceMapEncoding = NonmovableArrays.getHostedArray(referenceMapEncoding);
     }
 
+    @Uninterruptible(reason = "Called from uninterruptible code.")
     public static NonmovableArray<Byte> getReferenceMapEncoding() {
         return NonmovableArrays.fromImageHeap(ImageSingletons.lookup(DynamicHubSupport.class).referenceMapEncoding);
     }

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/threadlocal/VMThreadLocalMTSupport.java

@@ -27,8 +27,11 @@
 import org.graalvm.nativeimage.Platform;
 import org.graalvm.nativeimage.Platforms;
 
+import com.oracle.svm.core.annotate.Uninterruptible;
 import com.oracle.svm.core.annotate.UnknownObjectField;
 import com.oracle.svm.core.annotate.UnknownPrimitiveField;
+import com.oracle.svm.core.c.NonmovableArray;
+import com.oracle.svm.core.c.NonmovableArrays;
 
 public class VMThreadLocalMTSupport {
     @UnknownPrimitiveField public int vmThreadSize = -1;
@@ -38,4 +41,18 @@ public class VMThreadLocalMTSupport {
     @Platforms(Platform.HOSTED_ONLY.class)
     public VMThreadLocalMTSupport() {
     }
+
+    @Uninterruptible(reason = "Called from uninterruptible code.", mayBeInlined = true)
+    public NonmovableArray<Byte> getThreadLocalsReferenceMap() {
+        assert vmThreadReferenceMapEncoding != null;
+        return NonmovableArrays.fromImageHeap(vmThreadReferenceMapEncoding);
+    }
+
+    @Uninterruptible(reason = "Called from uninterruptible code.", mayBeInlined = true)
+    public int getThreadLocalsReferenceMapIndex() {
+        long result = vmThreadReferenceMapIndex;
+        assert result >= 0;
+        assert (int) result == result;
+        return (int) result;
+    }
 }

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/util/VMError.java

@@ -90,6 +90,10 @@ public static RuntimeException unimplemented() {
         throw new UnsupportedOperationException("unimplemented");
     }
 
+    public static RuntimeException unimplemented(String msg) {
+        throw new UnsupportedOperationException(msg);
+    }
+
     public static RuntimeException unsupportedFeature(String msg) {
         throw new HostedError("UNSUPPORTED FEATURE: " + msg);
     }