Support inlining at call-sites with mismatched number of arguments.

src/hydrogen.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 325 matching lines @@
 
 Zone* HBasicBlock::zone() { return graph_->zone(); }
 
 
 class HEnvironment: public ZoneObject {
  public:
   HEnvironment(HEnvironment* outer,
                Scope* scope,
                Handle<JSFunction> closure);
 
+  bool is_arguments_adaptor() const {
+    return arguments_adaptor_;
+  }
+
+  HEnvironment* DiscardInlined(bool drop_extra) {
+    HEnvironment* outer = outer_->is_arguments_adaptor() ?
+        outer_->outer_ : outer_;
+    if (drop_extra) outer->Drop(1);
+    return outer;
+  }
+
   // Simple accessors.
   Handle<JSFunction> closure() const { return closure_; }
   const ZoneList<HValue*>* values() const { return &values_; }
   const ZoneList<int>* assigned_variables() const {
     return &assigned_variables_;
   }
   int parameter_count() const { return parameter_count_; }
   int specials_count() const { return specials_count_; }
   int local_count() const { return local_count_; }
   HEnvironment* outer() const { return outer_; }
@@ skipping 64 matching lines @@
   void SetExpressionStackAt(int index_from_top, HValue* value);
 
   HEnvironment* Copy() const;
   HEnvironment* CopyWithoutHistory() const;
   HEnvironment* CopyAsLoopHeader(HBasicBlock* block) const;
 
   // Create an "inlined version" of this environment, where the original
   // environment is the outer environment but the top expression stack
   // elements are moved to an inner environment as parameters.
   HEnvironment* CopyForInlining(Handle<JSFunction> target,
+                                int arguments,
                                 FunctionLiteral* function,
                                 HConstant* undefined,
                                 CallKind call_kind) const;
 
   void AddIncomingEdge(HBasicBlock* block, HEnvironment* other);
 
   void ClearHistory() {
     pop_count_ = 0;
     push_count_ = 0;
     assigned_variables_.Rewind(0);
   }
 
   void SetValueAt(int index, HValue* value) {
     ASSERT(index < length());
     values_[index] = value;
   }
 
   void PrintTo(StringStream* stream);
   void PrintToStd();
 
  private:
   explicit HEnvironment(const HEnvironment* other);
 
+  // Create an argument adaptor environment.
+  HEnvironment(HEnvironment* outer, Handle<JSFunction> closure, int arguments);
+
+
   // True if index is included in the expression stack part of the environment.
   bool HasExpressionAt(int index) const;
 
   void Initialize(int parameter_count, int local_count, int stack_height);
   void Initialize(const HEnvironment* other);
 
   // Map a variable to an environment index.  Parameter indices are shifted
   // by 1 (receiver is parameter index -1 but environment index 0).
   // Stack-allocated local indices are shifted by the number of parameters.
   int IndexFor(Variable* variable) const {
     ASSERT(variable->IsStackAllocated());
     int shift = variable->IsParameter()
         ? 1
         : parameter_count_ + specials_count_;
     return variable->index() + shift;
   }
 
   Handle<JSFunction> closure_;
   // Value array [parameters] [specials] [locals] [temporaries].
   ZoneList<HValue*> values_;
   ZoneList<int> assigned_variables_;
   int parameter_count_;
   int specials_count_;
   int local_count_;
   HEnvironment* outer_;
   int pop_count_;
   int push_count_;
   int ast_id_;
+  bool arguments_adaptor_;
 };
 
 
 class HGraphBuilder;
 
 enum ArgumentsAllowedFlag {
   ARGUMENTS_NOT_ALLOWED,
   ARGUMENTS_ALLOWED
 };
 
@@ skipping 761 matching lines @@
   const char* filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_