1 files changed, 26 insertions, 2 deletions
diff --git a/js/src/frontend/ParseNode.h b/js/src/frontend/ParseNode.h
index 61c009c6e4..a6747897d6 100644
--- a/js/src/frontend/ParseNode.h
+++ b/js/src/frontend/ParseNode.h
@@ -75,6 +75,7 @@ class FunctionBox;
   F(PostDecrementExpr, UnaryNode)                                \
   F(PropertyNameExpr, NameNode)                                  \
   F(DotExpr, PropertyAccess)                                     \
+  F(ArgumentsLength, ArgumentsLength)                            \
   F(ElemExpr, PropertyByValue)                                   \
   F(PrivateMemberExpr, PrivateMemberAccess)                      \
   F(OptionalDotExpr, OptionalPropertyAccess)                     \
@@ -616,6 +617,7 @@ inline bool IsTypeofKind(ParseNodeKind kind) {
   MACRO(ClassNames)                        \
   MACRO(ForNode)                           \
   MACRO(PropertyAccess)                    \
+  MACRO(ArgumentsLength)                   \
   MACRO(OptionalPropertyAccess)            \
   MACRO(PropertyByValue)                   \
   MACRO(OptionalPropertyByValue)           \
@@ -2014,7 +2016,8 @@ class PropertyAccessBase : public BinaryNode {
 
   static bool test(const ParseNode& node) {
     bool match = node.isKind(ParseNodeKind::DotExpr) ||
-                 node.isKind(ParseNodeKind::OptionalDotExpr);
+                 node.isKind(ParseNodeKind::OptionalDotExpr) ||
+                 node.isKind(ParseNodeKind::ArgumentsLength);
     MOZ_ASSERT_IF(match, node.is<BinaryNode>());
     MOZ_ASSERT_IF(match, node.as<BinaryNode>().right()->isKind(
                              ParseNodeKind::PropertyNameExpr));
@@ -2042,7 +2045,8 @@ class PropertyAccess : public PropertyAccessBase {
   }
 
   static bool test(const ParseNode& node) {
-    bool match = node.isKind(ParseNodeKind::DotExpr);
+    bool match = node.isKind(ParseNodeKind::DotExpr) ||
+                 node.isKind(ParseNodeKind::ArgumentsLength);
     MOZ_ASSERT_IF(match, node.is<PropertyAccessBase>());
     return match;
   }
@@ -2051,6 +2055,26 @@ class PropertyAccess : public PropertyAccessBase {
     // ParseNodeKind::SuperBase cannot result from any expression syntax.
     return expression().isKind(ParseNodeKind::SuperBase);
   }
+
+ protected:
+  using PropertyAccessBase::PropertyAccessBase;
+};
+
+class ArgumentsLength : public PropertyAccess {
+ public:
+  ArgumentsLength(ParseNode* lhs, NameNode* name, uint32_t begin, uint32_t end)
+      : PropertyAccess(ParseNodeKind::ArgumentsLength, lhs, name, begin, end) {
+    MOZ_ASSERT(lhs);
+    MOZ_ASSERT(name);
+  }
+
+  static bool test(const ParseNode& node) {
+    bool match = node.isKind(ParseNodeKind::ArgumentsLength);
+    MOZ_ASSERT_IF(match, node.is<PropertyAccessBase>());
+    return match;
+  }
+
+  bool isSuper() const { return false; }
 };
 
 class OptionalPropertyAccess : public PropertyAccessBase {