From: Fahad Arshad <fahadaliarshad@gmail.com>
Date: Wed, 26 Feb 2014 14:41:05 +0000 (-0500)
Subject: PR16472: Add a thread_indent_depth() tapset function
X-Git-Tag: release-2.5~245
X-Git-Url: https://sourceware.org/git/?a=commitdiff_plain;h=cecdb2dddae55b510814dc8a6d7510e5fa5e0d9f;p=systemtap.git

PR16472: Add a thread_indent_depth() tapset function
---

diff --git a/tapset/indent.stp b/tapset/indent.stp
index bc608461b..33bb98d1f 100644
--- a/tapset/indent.stp
+++ b/tapset/indent.stp
@@ -36,6 +36,30 @@ function thread_indent:string (delta:long)
   return _generic_indent (tid(), sprintf("%s(%d)", execname(), tid()), delta)
 }
 
+function _generic_indent_depth:long (idx, delta) 
+{
+  # pre-increment for positive delta and post-decrement for negative delta
+  x = _indent_counters[idx] + (delta > 0 ? delta : 0)
+  _indent_counters[idx] += delta
+
+  return (x>0 ? x-1 : 0)
+}
+
+/**
+ * sfunction thread_indent_depth - returns an integer corresponding to the nested-depth in the current task information
+ *
+ * @delta: the amount of increment added/removed for each call
+ *
+ * Description: This function returns an integer equal to the nested function-call depth starting 
+ * from the outermost initial level. This function is useful for saving space (consumed by whitespace)
+ * in traces with long nested function calls. Use this function in a similar fashion to thread_indent(), i.e.,
+ * in call-probe, use thread_indent_depth(1) and in return-probe, use thread_indent_depth(-1)
+ */
+function thread_indent_depth:long (delta:long)
+{
+  return _generic_indent_depth (tid(), delta)
+}
+
 /**
  * sfunction indent - returns an amount of space to indent
  *