From 39c2feaf8c4dcb9c3a30c68a066fb70e126d7fe6 Mon Sep 17 00:00:00 2001
From: Justin Berger <j.david.berger@gmail.com>
Date: Sat, 22 Jul 2017 18:34:33 -0600
Subject: misc: Added utility method to allow working with stacks

---
 Source/cmListFileCache.cxx | 13 +++++++++++++
 Source/cmListFileCache.h   |  4 ++++
 2 files changed, 17 insertions(+)

diff --git a/Source/cmListFileCache.cxx b/Source/cmListFileCache.cxx
index 8e8a54d..cbcf200 100644
--- a/Source/cmListFileCache.cxx
+++ b/Source/cmListFileCache.cxx
@@ -438,6 +438,19 @@ void cmListFileBacktrace::PrintCallStack(std::ostream& out) const
   }
 }
 
+size_t cmListFileBacktrace::Depth() const
+{
+  size_t depth = 0;
+  if (this->Cur == nullptr) {
+    return 0;
+  }
+
+  for (Entry* i = this->Cur->Up; i; i = i->Up) {
+    depth++;
+  }
+  return depth;
+}
+
 std::ostream& operator<<(std::ostream& os, cmListFileContext const& lfc)
 {
   os << lfc.FilePath;
diff --git a/Source/cmListFileCache.h b/Source/cmListFileCache.h
index 349ddef..1f9e374 100644
--- a/Source/cmListFileCache.h
+++ b/Source/cmListFileCache.h
@@ -6,6 +6,7 @@
 #include "cmConfigure.h" // IWYU pragma: keep
 
 #include <iosfwd>
+#include <stddef.h>
 #include <string>
 #include <vector>
 
@@ -138,6 +139,9 @@ public:
   // Print the call stack below the top of the backtrace.
   void PrintCallStack(std::ostream& out) const;
 
+  // Get the number of 'frames' in this backtrace
+  size_t Depth() const;
+
 private:
   struct Entry;
 
-- 
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