src/java.base/share/classes/java/lang/invoke/InvokerBytecodeGenerator.java

*** 609,635 ****
          mv.visitVarInsn(Opcodes.ALOAD, localsMap[0]);
          mv.visitMethodInsn(Opcodes.INVOKESTATIC, MHI, "assertSame", LLV_SIG, false);
          return true;
      }
  
      /**
       * Generate an invoker method for the passed {@link LambdaForm}.
       */
      private byte[] generateCustomizedCodeBytes() {
          classFilePrologue();
  
          // Suppress this method in backtraces displayed to the user.
!         mv.visitAnnotation("Ljava/lang/invoke/LambdaForm$Hidden;", true);
  
          // Mark this method as a compiled LambdaForm
!         mv.visitAnnotation("Ljava/lang/invoke/LambdaForm$Compiled;", true);
  
          if (lambdaForm.forceInline) {
              // Force inlining of this invoker method.
!             mv.visitAnnotation("Ljdk/internal/vm/annotation/ForceInline;", true);
          } else {
!             mv.visitAnnotation("Ljdk/internal/vm/annotation/DontInline;", true);
          }
  
          if (lambdaForm.customized != null) {
              // Since LambdaForm is customized for a particular MethodHandle, it's safe to substitute
              // receiver MethodHandle (at slot #0) with an embedded constant and use it instead.
--- 609,660 ----
          mv.visitVarInsn(Opcodes.ALOAD, localsMap[0]);
          mv.visitMethodInsn(Opcodes.INVOKESTATIC, MHI, "assertSame", LLV_SIG, false);
          return true;
      }
      
+     static String className(String cn) {
+         assert checkClassName(cn): "Class not found: " + cn;
+         return cn;
+     }
+    
+     static boolean checkClassName(String cn) {
+         Type tp = Type.getType(cn);
+         // additional sanity so only valid "L;" descriptors work
+         if (tp.getSort() != Type.OBJECT) {
+             return false;
+         } 
+         try {
+             Class<?> c = Class.forName(tp.getClassName(), false, null);
+             return true;
+         } catch (ClassNotFoundException e) {
+             return false;
+         }
+     }
+ 
+     static final String  LF_HIDDEN_SIG = className("Ljava/lang/invoke/LambdaForm$Hidden;");
+     static final String  LF_COMPILED_SIG = className("Ljava/lang/invoke/LambdaForm$Compiled;");
+     static final String  FORCEINLINE_SIG = className("Ljdk/internal/vm/annotation/ForceInline;");
+     static final String  DONTINLINE_SIG = className("Ljdk/internal/vm/annotation/DontInline;");
+     static final String  INJECTEDPROFILE_SIG = className("Ljava/lang/invoke/InjectedProfile;");
+ 
      /**
       * Generate an invoker method for the passed {@link LambdaForm}.
       */
      private byte[] generateCustomizedCodeBytes() {
          classFilePrologue();
  
          // Suppress this method in backtraces displayed to the user.
!         mv.visitAnnotation(LF_HIDDEN_SIG, true);
  
          // Mark this method as a compiled LambdaForm
!         mv.visitAnnotation(LF_COMPILED_SIG, true);
  
          if (lambdaForm.forceInline) {
              // Force inlining of this invoker method.
!             mv.visitAnnotation(FORCEINLINE_SIG, true);
          } else {
!             mv.visitAnnotation(DONTINLINE_SIG, true);
          }
  
          if (lambdaForm.customized != null) {
              // Since LambdaForm is customized for a particular MethodHandle, it's safe to substitute
              // receiver MethodHandle (at slot #0) with an embedded constant and use it instead.
*** 654,664 ****
                  case SELECT_ALTERNATIVE:
                      assert isSelectAlternative(i);
                      if (PROFILE_GWT) {
                          assert(name.arguments[0] instanceof Name &&
                                 nameRefersTo((Name)name.arguments[0], MethodHandleImpl.class, "profileBoolean"));
!                         mv.visitAnnotation("Ljava/lang/invoke/InjectedProfile;", true);
                      }
                      onStack = emitSelectAlternative(name, lambdaForm.names[i+1]);
                      i++;  // skip MH.invokeBasic of the selectAlternative result
                      continue;
                  case GUARD_WITH_CATCH:
--- 679,689 ----
                  case SELECT_ALTERNATIVE:
                      assert isSelectAlternative(i);
                      if (PROFILE_GWT) {
                          assert(name.arguments[0] instanceof Name &&
                                 nameRefersTo((Name)name.arguments[0], MethodHandleImpl.class, "profileBoolean"));
!                         mv.visitAnnotation(INJECTEDPROFILE_SIG, true);
                      }
                      onStack = emitSelectAlternative(name, lambdaForm.names[i+1]);
                      i++;  // skip MH.invokeBasic of the selectAlternative result
                      continue;
                  case GUARD_WITH_CATCH:
*** 1304,1317 ****
  
      private byte[] generateLambdaFormInterpreterEntryPointBytes() {
          classFilePrologue();
  
          // Suppress this method in backtraces displayed to the user.
!         mv.visitAnnotation("Ljava/lang/invoke/LambdaForm$Hidden;", true);
  
          // Don't inline the interpreter entry.
!         mv.visitAnnotation("Ljdk/internal/vm/annotation/DontInline;", true);
  
          // create parameter array
          emitIconstInsn(invokerType.parameterCount());
          mv.visitTypeInsn(Opcodes.ANEWARRAY, "java/lang/Object");
  
--- 1329,1342 ----
  
      private byte[] generateLambdaFormInterpreterEntryPointBytes() {
          classFilePrologue();
  
          // Suppress this method in backtraces displayed to the user.
!         mv.visitAnnotation(LF_HIDDEN_SIG, true);
  
          // Don't inline the interpreter entry.
!         mv.visitAnnotation(DONTINLINE_SIG, true);
  
          // create parameter array
          emitIconstInsn(invokerType.parameterCount());
          mv.visitTypeInsn(Opcodes.ANEWARRAY, "java/lang/Object");
  
*** 1363,1376 ****
      private byte[] generateNamedFunctionInvokerImpl(MethodTypeForm typeForm) {
          MethodType dstType = typeForm.erasedType();
          classFilePrologue();
  
          // Suppress this method in backtraces displayed to the user.
!         mv.visitAnnotation("Ljava/lang/invoke/LambdaForm$Hidden;", true);
  
          // Force inlining of this invoker method.
!         mv.visitAnnotation("Ljdk/internal/vm/annotation/ForceInline;", true);
  
          // Load receiver
          emitAloadInsn(0);
  
          // Load arguments from array
--- 1388,1401 ----
      private byte[] generateNamedFunctionInvokerImpl(MethodTypeForm typeForm) {
          MethodType dstType = typeForm.erasedType();
          classFilePrologue();
  
          // Suppress this method in backtraces displayed to the user.
!         mv.visitAnnotation(LF_HIDDEN_SIG, true);
  
          // Force inlining of this invoker method.
!         mv.visitAnnotation(FORCEINLINE_SIG, true);
  
          // Load receiver
          emitAloadInsn(0);
  
          // Load arguments from array