Remove StringAccess

Author: Christian Wimmer

substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/ProgressReporter.java

@@ -26,6 +26,8 @@
 
 import java.io.File;
 import java.io.PrintWriter;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.VarHandle;
 import java.lang.management.GarbageCollectorMXBean;
 import java.lang.management.ManagementFactory;
 import java.lang.management.OperatingSystemMXBean;
@@ -441,14 +443,28 @@ private static Map<String, Long> calculateCodeBreakdown(Collection<CompileTask>
         return classNameToCodeSize;
     }
 
+    private static final VarHandle STRING_VALUE;
+    static {
+        try {
+            MethodHandles.Lookup privateLookup = MethodHandles.privateLookupIn(String.class, MethodHandles.lookup());
+            STRING_VALUE = privateLookup.unreflectVarHandle(String.class.getDeclaredField("value"));
+        } catch (ReflectiveOperationException e) {
+            throw new ExceptionInInitializerError(e);
+        }
+    }
+
+    private static int getInternalByteArrayLength(String string) {
+        return ((byte[]) STRING_VALUE.get(string)).length;
+    }
+
     private Map<String, Long> calculateHeapBreakdown(Collection<ObjectInfo> heapObjects) {
         Map<String, Long> classNameToSize = new HashMap<>();
         long stringByteLength = 0;
         for (ObjectInfo o : heapObjects) {
             classNameToSize.merge(o.getClazz().toJavaName(true), o.getSize(), Long::sum);
             Object javaObject = o.getObject();
             if (javaObject instanceof String) {
-                stringByteLength += StringAccess.getInternalByteArrayLength((String) javaObject);
+                stringByteLength += getInternalByteArrayLength((String) javaObject);
             }
         }