First step in letting Crankshaft inline functions with a different context.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index bd51dd15651cc10fb53e2454fca2cfe1c6ea1451..876b1cf4f26cee9e0246e8096ad55208749cbe11 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -322,6 +322,7 @@ class HEnvironment: public ZoneObject {
     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_; }
   int pop_count() const { return pop_count_; }
@@ -331,6 +332,9 @@ class HEnvironment: public ZoneObject {
   void set_ast_id(int id) { ast_id_ = id; }
 
   int length() const { return values_.length(); }
+  bool is_special_index(int i) const {
+    return i >= parameter_count() && i < parameter_count() + specials_count();
+  }
 
   void Bind(Variable* variable, HValue* value) {
     Bind(IndexFor(variable), value);
@@ -348,6 +352,11 @@ class HEnvironment: public ZoneObject {
     return result;
   }
 
+  HValue* LookupContext() const {

[Kevin Millikin (Chromium), 2011/05/06 12:29:45]

Probably should have a BindContext function too, so this class is the only place
that has to know the context's environment index.

+    // Return first special.
+    return Lookup(parameter_count());
+  }
+
   void Push(HValue* value) {
     ASSERT(value != NULL);
     ++push_count_;
@@ -423,15 +432,18 @@ class HEnvironment: public ZoneObject {
   int IndexFor(Variable* variable) const {
     Slot* slot = variable->AsSlot();
     ASSERT(slot != NULL && slot->IsStackAllocated());
-    int shift = (slot->type() == Slot::PARAMETER) ? 1 : parameter_count_;
+    int shift = (slot->type() == Slot::PARAMETER)
+        ? 1
+        : parameter_count_ + specials_count_;
     return slot->index() + shift;
   }
 
   Handle<JSFunction> closure_;
-  // Value array [parameters] [locals] [temporaries].
+  // 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_;