Add inspection of arguments for optimized frames

src/deoptimizer.h

Index: src/deoptimizer.h
diff --git a/src/deoptimizer.h b/src/deoptimizer.h
index 8f368b44ad687c8440825c4c34e06375ac27a289..27ff8ddcce51679f070cce934d820f9e79775dca 100644
--- a/src/deoptimizer.h
+++ b/src/deoptimizer.h
@@ -400,6 +400,12 @@ class FrameDescription {
   void SetKind(Code::Kind kind) { kind_ = kind; }
 #endif
 
+  // Get the incoming arguments count.
+  int ComputeParametersCount();
+
+  // Get a parameter value for an unoptimized frame.
+  Object* GetParameter(Deoptimizer* deoptimizer, int index);
+
   // Get the expression stack height for a unoptimized frame.
   unsigned GetExpressionCount(Deoptimizer* deoptimizer);
 
@@ -662,6 +668,9 @@ class DeoptimizedFrameInfo : public Malloced {
   // GC support.
   void Iterate(ObjectVisitor* v);
 
+  // Return the number of incoming arguments.
+  int parameters_count() { return parameters_count_; }
+
   // Return the height of the expression stack.
   int expression_count() { return expression_count_; }
 
@@ -670,6 +679,12 @@ class DeoptimizedFrameInfo : public Malloced {
     return function_;
   }
 
+  // Get an incoming argument.
+  Object* GetParameter(int index) {
+    ASSERT(0 <= index && index < parameters_count());
+    return parameters_[index];
+  }
+
   // Get an expression from the expression stack.
   Object* GetExpression(int index) {
     ASSERT(0 <= index && index < expression_count());
@@ -682,6 +697,12 @@ class DeoptimizedFrameInfo : public Malloced {
     function_ = function;
   }
 
+  // Set an incoming argument.
+  void SetParameter(int index, Object* obj) {
+    ASSERT(0 <= index && index < parameters_count());
+    parameters_[index] = obj;
+  }
+
   // Set an expression on the expression stack.
   void SetExpression(int index, Object* obj) {
     ASSERT(0 <= index && index < expression_count());
@@ -689,7 +710,9 @@ class DeoptimizedFrameInfo : public Malloced {
   }
 
   JSFunction* function_;
+  int parameters_count_;
   int expression_count_;
+  Object** parameters_;
   Object** expression_stack_;
 
   friend class Deoptimizer;