Support evaluation of expressions in context of a stack frame

runtime/vm/object.h

Index: runtime/vm/object.h
===================================================================
--- runtime/vm/object.h	(revision 35336)
+++ runtime/vm/object.h	(working copy)
@@ -1050,8 +1050,12 @@
 
   // Evaluate the given expression as if it appeared in a static
   // method of this class and return the resulting value, or an
-  // error object if evaluating the expression fails.
-  RawObject* Evaluate(const String& expr) const;
+  // error object if evaluating the expression fails. The method has
+  // the formal parameters given in param_names, and is invoked with
+  // the argument values given in param_values.
+  RawObject* Evaluate(const String& expr,
+                      const Array& param_names,
+                      const Array& param_values) const;
 
   RawError* EnsureIsFinalized(Isolate* isolate) const;
 
@@ -2542,7 +2546,14 @@
 
   static RawLibrary* New(const String& url);
 
-  RawObject* Evaluate(const String& expr) const;
+  // Evaluate the given expression as if it appeared in an top-level
+  // method of this library and return the resulting value, or an
+  // error object if evaluating the expression fails. The method has
+  // the formal parameters given in param_names, and is invoked with
+  // the argument values given in param_values.
+  RawObject* Evaluate(const String& expr,
+                      const Array& param_names,
+                      const Array& param_values) const;
 
   // Library scope name dictionary.
   //
@@ -4062,8 +4073,12 @@
 
   // Evaluate the given expression as if it appeared in an instance
   // method of this instance and return the resulting value, or an
-  // error object if evaluating the expression fails.
-  RawObject* Evaluate(const String& expr) const;
+  // error object if evaluating the expression fails. The method has
+  // the formal parameters given in param_names, and is invoked with
+  // the argument values given in param_values.
+  RawObject* Evaluate(const String& expr,
+                      const Array& param_names,
+                      const Array& param_values) const;
 
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawInstance));