Remove support for 'argument definitions test' from dart2js.

sdk/lib/_internal/compiler/implementation/ssa/builder.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of ssa;
 
 /**
  * A special element for the extra parameter taken by intercepted
  * methods. We need to override [Element.computeType] because our
  * optimizers may look at its declared type.
@@ skipping 1383 matching lines @@
         constructor = constructor.targetConstructor;
       }
       elements =
           compiler.enqueuer.resolution.getCachedElements(constructor);
       ClosureClassMap oldClosureData = localsHandler.closureData;
       Node node = constructor.parseNode(compiler);
       ClosureClassMap newClosureData =
           compiler.closureToClassMapper.computeClosureToClassMapping(
               constructor, node, elements);
       localsHandler.closureData = newClosureData;
-
-      params.orderedForEachParameter((Element parameterElement) {
-        if (elements.isParameterChecked(parameterElement)) {
-          addParameterCheckInstruction(parameterElement);
-        }
-      });
       localsHandler.enterScope(node, constructor);
       buildInitializers(constructor, constructors, fieldValues);
       localsHandler.closureData = oldClosureData;
       elements = oldElements;
     });
   }
 
   /**
    * Run through the initializers and inline all field initializers. Recursively
    * inlines super initializers.
@@ skipping 196 matching lines @@
       FunctionSignature functionSignature = body.computeSignature(compiler);
       // Provide the parameters to the generative constructor body.
       functionSignature.orderedForEachParameter((parameter) {
         // If [parameter] is boxed, it will be a field in the box passed as the
         // last parameter. So no need to directly pass it.
         if (!localsHandler.isBoxed(parameter)) {
           bodyCallInputs.add(localsHandler.readLocal(parameter));
         }
       });
 
-      // Provide the parameter checks to the generative constructor
-      // body.
-      functionSignature.orderedForEachParameter((parameter) {
-        // If [parameter] is checked, we pass the already computed
-        // boolean to the constructor body.
-        if (elements.isParameterChecked(parameter)) {
-          Element fieldCheck =
-              parameterClosureData.parametersWithSentinel[parameter];
-          bodyCallInputs.add(localsHandler.readLocal(fieldCheck));
-        }
-      });
-
       ClassElement currentClass = constructor.getEnclosingClass();
       if (backend.classNeedsRti(currentClass)) {
         // If [currentClass] needs RTI, we add the type variables as
         // parameters of the generative constructor body.
         currentClass.typeVariables.forEach((DartType argument) {
           bodyCallInputs.add(localsHandler.readLocal(argument.element));
         });
       }
 
       // If there are locals that escape (ie mutated in closures), we
@@ skipping 15 matching lines @@
     }
     if (inliningStack.isEmpty) {
       closeAndGotoExit(new HReturn(newObject));
       return closeFunction();
     } else {
       localsHandler.updateLocal(returnElement, newObject);
       return null;
     }
   }
 
-  void addParameterCheckInstruction(Element element) {
-    HInstruction check;
-    Element checkResultElement =
-        localsHandler.closureData.parametersWithSentinel[element];
-    if (currentElement.isGenerativeConstructorBody()) {
-      // A generative constructor body receives extra parameters that
-      // indicate if a parameter was passed to the factory.
-      check = addParameter(checkResultElement);
-    } else {
-      // This is the code we emit for a parameter that is being checked
-      // on whether it was given at value at the call site:
-      //
-      // foo([a = 42]) {
-      //   if (?a) print('parameter passed $a');
-      // }
-      //
-      // foo([a = 42]) {
-      //   var t1 = identical(a, sentinel);
-      //   if (t1) a = 42;
-      //   if (!t1) print('parameter passed ' + a);
-      // }
-
-      // Fetch the original default value of [element];
-      Constant constant = compileVariable(element);
-      HConstant defaultValue = constant == null
-          ? graph.addConstantNull(compiler)
-          : graph.addConstant(constant, compiler);
-
-      // Emit the equality check with the sentinel.
-      HConstant sentinel =
-          graph.addConstant(SentinelConstant.SENTINEL, compiler);
-      HInstruction operand = parameters[element];
-      check = new HIdentity(sentinel, operand);
-      add(check);
-
-      // If the check succeeds, we must update the parameter with the
-      // default value.
-      handleIf(element.parseNode(compiler),
-               () => stack.add(check),
-               () => localsHandler.updateLocal(element, defaultValue),
-               null);
-
-      // Create the instruction that parameter checks will use.
-      check = new HNot(check);
-      add(check);
-    }
-
-    localsHandler.updateLocal(checkResultElement, check);
-  }
-
   /**
    * Documentation wanted -- johnniwinther
    *
    * Invariant: [functionElement] must be the implementation element.
    */
   void openFunction(Element element, Expression node) {
     assert(invariant(element, element.isImplementation));
     HBasicBlock block = graph.addNewBlock();
     open(graph.entry);
 
@@ skipping 10 matching lines @@
         && backend.classNeedsRti(enclosing)) {
       enclosing.typeVariables.forEach((TypeVariableType typeVariable) {
         HParameterValue param = addParameter(typeVariable.element);
         localsHandler.directLocals[typeVariable.element] = param;
       });
     }
 
     if (element is FunctionElement) {
       FunctionElement functionElement = element;
       FunctionSignature signature = functionElement.computeSignature(compiler);
-      signature.orderedForEachParameter((Element parameterElement) {
-        if (elements.isParameterChecked(parameterElement)) {
-          addParameterCheckInstruction(parameterElement);
-        }
-      });
 
       // Put the type checks in the first successor of the entry,
       // because that is where the type guards will also be inserted.
       // This way we ensure that a type guard will dominate the type
       // check.
       signature.orderedForEachParameter((Element parameterElement) {
         if (element.isGenerativeConstructorBody()) {
           ClosureScope scopeData =
               localsHandler.closureData.capturingScopes[node];
           if (scopeData != null
@@ skipping 757 matching lines @@
   }
 
   void visitLogicalNot(Send node) {
     assert(node.argumentsNode is Prefix);
     visit(node.receiver);
     HNot not = new HNot(popBoolified());
     pushWithPosition(not, node);
   }
 
   void visitUnary(Send node, Operator op) {
-    if (node.isParameterCheck) {
-      Element element = elements[node.receiver];
-      Node function = element.enclosingElement.parseNode(compiler);
-      ClosureClassMap parameterClosureData =
-          compiler.closureToClassMapper.getMappingForNestedFunction(function);
-      Element fieldCheck =
-          parameterClosureData.parametersWithSentinel[element];
-      stack.add(localsHandler.readLocal(fieldCheck));
-      return;
-    }
     assert(node.argumentsNode is Prefix);
     visit(node.receiver);
     assert(!identical(op.token.kind, PLUS_TOKEN));
     HInstruction operand = pop();
 
     // See if we can constant-fold right away. This avoids rewrites later on.
     if (operand is HConstant) {
       UnaryOperation operation = constantSystem.lookupUnary(op.source);
       HConstant constant = operand;
       Constant folded = operation.fold(constant.constant);
@@ skipping 380 matching lines @@
       // of instructions, in an order that can be shared with
       // selectors with the same named arguments.
       List<SourceString> orderedNames = selector.getOrderedNamedArguments();
       for (SourceString name in orderedNames) {
         list.add(instructions[name]);
       }
     }
   }
 
   HInstruction handleConstantForOptionalParameter(Element parameter) {
-    Constant constant;
-    Element element = parameter.enclosingElement;
-    TreeElements calleeElements =
-        compiler.enqueuer.resolution.getCachedElements(element);
-    if (calleeElements.isParameterChecked(parameter)) {
-      constant = SentinelConstant.SENTINEL;
-    } else {
-      constant = compileConstant(parameter);
-    }
+    Constant constant = compileConstant(parameter);
     return graph.addConstant(constant, compiler);
   }
 
   /**
    * Returns true if the arguments were compatible with the function signature.
    *
    * Invariant: [element] must be an implementation element.
    */
   bool addStaticSendArgumentsToList(Selector selector,
                                     Link<Node> arguments,
@@ skipping 2260 matching lines @@
     tooDifficult = true;
   }
 
   void visitFunctionDeclaration(Node node) {
     if (!registerNode()) return;
     tooDifficult = true;
   }
 
   void visitSend(Send node) {
     if (!registerNode()) return;
-    if (node.isParameterCheck) {
-      tooDifficult = true;
-      return;
-    }
     node.visitChildren(this);
   }
 
   visitLoop(Node node) {
     // It's actually not difficult to inline a method with a loop, but
     // our measurements show that it's currently better to not inline a
     // method that contains a loop.
     tooDifficult = true;
   }
 
@@ skipping 278 matching lines @@
           new HSubGraphBlockInformation(elseBranch.graph));
 
     HBasicBlock conditionStartBlock = conditionBranch.block;
     conditionStartBlock.setBlockFlow(info, joinBlock);
     SubGraph conditionGraph = conditionBranch.graph;
     HIf branch = conditionGraph.end.last;
     assert(branch is HIf);
     branch.blockInformation = conditionStartBlock.blockFlow;
   }
 }