Implement argument definition test in the vm.

runtime/vm/ast.h

 // 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.
 
 #ifndef VM_AST_H_
 #define VM_AST_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
@@ skipping 14 matching lines @@
   V(UnaryOpNode, "unaryop")                                                    \
   V(ConditionalExprNode, "?:")                                                 \
   V(IfNode, "if")                                                              \
   V(SwitchNode, "switch")                                                      \
   V(CaseNode, "case")                                                          \
   V(WhileNode, "while")                                                        \
   V(DoWhileNode, "dowhile")                                                    \
   V(ForNode, "for")                                                            \
   V(JumpNode, "jump")                                                          \
   V(ArgumentListNode, "args")                                                  \
+  V(ArgumentDefinitionTestNode, "defined")                                     \
   V(ArrayNode, "array")                                                        \
   V(ClosureNode, "closure")                                                    \
   V(InstanceCallNode, "instance call")                                         \
   V(StaticCallNode, "static call")                                             \
   V(ClosureCallNode, "closure call")                                           \
   V(CloneContextNode, "clone context")                                         \
   V(ConstructorCallNode, "constructor call")                                   \
   V(InstanceGetterNode, "instance getter call")                                \
   V(InstanceSetterNode, "instance setter call")                                \
   V(StaticGetterNode, "static getter")                                         \
@@ skipping 192 matching lines @@
   DECLARE_COMMON_NODE_FUNCTIONS(ArgumentListNode);
 
  private:
   GrowableArray<AstNode*> nodes_;
   Array& names_;
 
   DISALLOW_COPY_AND_ASSIGN(ArgumentListNode);
 };
 
 
+class ArgumentDefinitionTestNode : public AstNode {
+ public:
+  ArgumentDefinitionTestNode(intptr_t token_pos,
+                             intptr_t formal_parameter_index,
+                             const String& formal_parameter_name,
+                             LocalVariable* saved_arguments_descriptor)
+     : AstNode(token_pos),
+       formal_parameter_index_(formal_parameter_index),
+       formal_parameter_name_(formal_parameter_name),
+       saved_arguments_descriptor_(*saved_arguments_descriptor) {
+    ASSERT(formal_parameter_index_ >= 0);
+    ASSERT(formal_parameter_name_.IsZoneHandle());
+    ASSERT(formal_parameter_name_.IsSymbol());
+    ASSERT(saved_arguments_descriptor != NULL);
+  }
+
+  virtual void VisitChildren(AstNodeVisitor* visitor) const { }
+
+  intptr_t formal_parameter_index() const { return formal_parameter_index_; }
+  const String& formal_parameter_name() const { return formal_parameter_name_; }
+  const LocalVariable& saved_arguments_descriptor() const {
+    return saved_arguments_descriptor_;
+  }
+
+  DECLARE_COMMON_NODE_FUNCTIONS(ArgumentDefinitionTestNode);
+
+ private:
+  const intptr_t formal_parameter_index_;
+  const String& formal_parameter_name_;
+  const LocalVariable& saved_arguments_descriptor_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArgumentDefinitionTestNode);
+};
+
+
 class ArrayNode : public AstNode {
  public:
   ArrayNode(intptr_t token_pos, const AbstractType& type)
       : AstNode(token_pos),
         type_(type),
         elements_() {
     ASSERT(type_.IsZoneHandle());
     ASSERT(!type_.IsNull());
     ASSERT(type_.IsFinalized());
   }
@@ skipping 1394 matching lines @@
   const LocalVariable& context_var_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(InlinedFinallyNode);
 };
 
 }  // namespace dart
 
 #undef DECLARE_COMMON_NODE_FUNCTIONS
 
 #endif  // VM_AST_H_