inlining of Zeek script functions

src/Frame.h

@@ -98,6 +98,15 @@ public:
 	Val* GetElement(const ID* id) const
 		{ return GetElementByID(id).get(); }
 
+	/**
+	 * Increases the current offset being used for frame accesses.
+	 * This is in support of inlined functions.
+	 *
+	 * @param incr  Amount by which to increase the frame offset.
+	 *              Use a negative value to shrink the offset.
+	 */
+	void IncreaseOffset(int incr)   { current_offset += incr; } 
+
 	/**
 	 * Resets all of the indexes from [*startIdx, frame_size) in
 	 * the Frame.
@@ -316,6 +325,12 @@ private:
 	/** Associates ID's offsets with values. */
 	std::unique_ptr<Element[]> frame;
 
+	/** The offset we're currently using for references into the frame.
+	 * This is how we support inlined functions without having to
+	 * alter the offsets associated with their local variables.
+	 */
+	int current_offset;
+
 	/** The enclosing frame of this frame. */
 	Frame* closure;