154 import jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor;

  1142                 return false;

  1143             }

  1144 

  1145             @Override

  1146             public boolean enterDELETE(final UnaryNode unaryNode) {

  1147                 loadDELETE(unaryNode);

  3798         }

  3799     }

  3800 

  3801     public void loadDELETE(final UnaryNode unaryNode) {

  3802         final Expression expression = unaryNode.getExpression();

  3803         if (expression instanceof IdentNode) {

  3804             final IdentNode ident = (IdentNode)expression;

  3805             final Symbol symbol = ident.getSymbol();

  3806             final String name = ident.getName();

  3807 

  3808             if (symbol.isThis()) {

  3809                 // Can't delete "this", ignore and return true

  3810                 if (!lc.popDiscardIfCurrent(unaryNode)) {

  3811                     method.load(true);

  3812                 }

  3813             } else if (lc.getCurrentFunction().isStrict()) {

  3814                 // All other scope identifier delete attempts fail for strict mode

  3815                 method.load(name);

  3816                 method.invoke(ScriptRuntime.STRICT_FAIL_DELETE);

  3817             } else if (!symbol.isScope() && (symbol.isParam() || (symbol.isVar() && !symbol.isProgramLevel()))) {

  3818                 // If symbol is a function parameter, or a declared non-global variable, delete is a no-op and returns false.

  3819                 if (!lc.popDiscardIfCurrent(unaryNode)) {

  3820                     method.load(false);

  3821                 }

  3822             } else {

  3823                 method.loadCompilerConstant(SCOPE);

  3824                 method.load(name);

  3825                 if ((symbol.isGlobal() && !symbol.isFunctionDeclaration()) || symbol.isProgramLevel()) {

  3826                     method.invoke(ScriptRuntime.SLOW_DELETE);

  3827                 } else {

  3828                     method.load(false); // never strict here; that was handled with STRICT_FAIL_DELETE above.

  3829                     method.invoke(ScriptObject.DELETE);

  3830                 }

  3831             }

  3832         } else if (expression instanceof BaseNode) {

  3833             loadExpressionAsObject(((BaseNode)expression).getBase());

  3834             if (expression instanceof AccessNode) {

  3835                 final AccessNode accessNode = (AccessNode) expression;

  3836                 method.dynamicRemove(accessNode.getProperty(), getCallSiteFlags(), accessNode.isIndex());

  3837             } else if (expression instanceof IndexNode) {

  3838                 loadExpressionAsObject(((IndexNode) expression).getIndex());

  3839                 method.dynamicRemoveIndex(getCallSiteFlags());

  3840             } else {

  3841                 throw new AssertionError(expression.getClass().getName());

  3842             }

  3843         } else {

  3844             throw new AssertionError(expression.getClass().getName());