samples/Main.asm

*** 36,52 ****
  //
  //    java -cp <asmtools.jar> org.openjdk.asmtools.Main jasm Main.asm
  //
  // See also: https://wiki.openjdk.java.net/display/CodeTools/asmtools
  //
! // NOTE: Uses nashorn internals and so *may* break with later nashorn!
  
  super public class Main
          version 52:0
  {
  
  
  public Method "<init>":"()V"
          stack 1 locals 1
  {
                  aload_0;
                  invokespecial   Method java/lang/Object."<init>":"()V";
--- 36,113 ----
  //
  //    java -cp <asmtools.jar> org.openjdk.asmtools.Main jasm Main.asm
  //
  // See also: https://wiki.openjdk.java.net/display/CodeTools/asmtools
  //
! // NOTE: Uses dynalink API defined by JEP-276 (http://openjdk.java.net/jeps/276)
  
  super public class Main
          version 52:0
  {
  
+ private static final Field linker:"Ljdk/dynalink/DynamicLinker;";
  
+ /*
+    static {
+         // create dynalink linker factory
+         final DynamicLinkerFactory factory = new DynamicLinkerFactory();
+ 
+         // create standard linker that can handle Java POJOs
+         linker = factory.createLinker();
+    }
+ */
+ static Method "<clinit>":"()V"
+         stack 2 locals 1
+ {
+     new     class jdk/dynalink/DynamicLinkerFactory;
+     dup;
+     invokespecial   Method jdk/dynalink/DynamicLinkerFactory."<init>":"()V";
+     astore_0;
+     aload_0;
+     invokevirtual   Method jdk/dynalink/DynamicLinkerFactory.createLinker:"()Ljdk/dynalink/DynamicLinker;";
+     putstatic       Field linker:"Ljdk/dynalink/DynamicLinker;";
+     return;
+ }
+ 
+ /*
+     // Bootstrap method used with invokedynamic methods
+ 
+     public static CallSite bootstrap(MethodHandles.Lookup caller, String name, MethodType type) {
+         // use dynalink linker to perform the actual linking
+         return linker.link(
+             new SimpleRelinkableCallSite(
+                 new CallSiteDescriptor(
+                     MethodHandles.publicLookup(), 
+                     new NamedOperation(StandardOperation.GET_PROPERTY, name), type)
+             )
+         );
+     }
+ 
+  */
+ public static Method bootstrap:"(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;"
+         stack 10 locals 3
+ {
+     getstatic       Field linker:"Ljdk/dynalink/DynamicLinker;";
+     new     class jdk/dynalink/support/SimpleRelinkableCallSite;
+     dup;
+     new     class jdk/dynalink/CallSiteDescriptor;
+     dup;
+     invokestatic    Method java/lang/invoke/MethodHandles.publicLookup:"()Ljava/lang/invoke/MethodHandles$Lookup;";
+     new     class jdk/dynalink/NamedOperation;
+     dup;
+     getstatic       Field jdk/dynalink/StandardOperation.GET_PROPERTY:"Ljdk/dynalink/StandardOperation;";
+     aload_1;
+     invokespecial   Method jdk/dynalink/NamedOperation."<init>":"(Ljdk/dynalink/Operation;Ljava/lang/Object;)V";
+     aload_2;
+     invokespecial   Method jdk/dynalink/CallSiteDescriptor."<init>":"(Ljava/lang/invoke/MethodHandles$Lookup;Ljdk/dynalink/Operation;Ljava/lang/invoke/MethodType;)V";
+     invokespecial   Method jdk/dynalink/support/SimpleRelinkableCallSite."<init>":"(Ljdk/dynalink/CallSiteDescriptor;)V";
+     invokevirtual   Method jdk/dynalink/DynamicLinker.link:"(Ljdk/dynalink/RelinkableCallSite;)Ljdk/dynalink/RelinkableCallSite;";
+     checkcast       class java/lang/invoke/CallSite;
+     areturn;
+ }
+ 
+ // default constructor that does nothing!
  public Method "<init>":"()V"
          stack 1 locals 1
  {
      aload_0;
      invokespecial       Method java/lang/Object."<init>":"()V";
*** 88,101 ****
          stack 2 locals 1
  {
                  getstatic       Field java/lang/System.out:"Ljava/io/PrintStream;";
                  aload_0;
  
!                 // Using nashorn embedded dynalink linker with the following invokedynamic
                  // 'length' property on a bean - arrays, lists supported
  
!                 invokedynamic   InvokeDynamic REF_invokeStatic:jdk/nashorn/internal/runtime/linker/Bootstrap.bootstrap:"(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;I)Ljava/lang/invoke/CallSite;":"dyn:getProp|getElem|getMethod:length":"(Ljava/lang/Object;)Ljava/lang/Object;" int 0;
  
                  // print 'length' value
                  invokevirtual   Method java/io/PrintStream.println:"(Ljava/lang/Object;)V";
                  return;
  }
--- 149,163 ----
          stack 2 locals 1
  {
      getstatic   Field java/lang/System.out:"Ljava/io/PrintStream;";
      aload_0;
  
!     // Using bootstrap method in this class with the following invokedynamic
!     // which uses dynalink linker. Dynalink's bean linker handles Java beans.
      // 'length' property on a bean - arrays, lists supported
  
!     invokedynamic   InvokeDynamic REF_invokeStatic:Main.bootstrap:"(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;":"length":"(Ljava/lang/Object;)Ljava/lang/Object;";
  
      // print 'length' value
      invokevirtual       Method java/io/PrintStream.println:"(Ljava/lang/Object;)V";
      return;
  }