From 5345d1e115fdf3fca7ea3e8330f1a23ad19257c8 Mon Sep 17 00:00:00 2001
From: "Brad Payne (Vir Linden)" <vir@lindenlab.com>
Date: Tue, 26 Jan 2016 08:23:40 -0500
Subject: SL-315 WIP - added a call stack extractor for windows to help with
 tracing joint issues (of course, could be used for other things as well).

---
 indra/llcommon/llcallstack.cpp | 93 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 indra/llcommon/llcallstack.cpp

(limited to 'indra/llcommon/llcallstack.cpp')

diff --git a/indra/llcommon/llcallstack.cpp b/indra/llcommon/llcallstack.cpp
new file mode 100644
index 0000000000..87eb37de16
--- /dev/null
+++ b/indra/llcommon/llcallstack.cpp
@@ -0,0 +1,93 @@
+/** 
+ * @file llcallstack.cpp
+ * @brief run-time extraction of the current callstack
+ *
+ * $LicenseInfo:firstyear=2016&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2016, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#include "llcommon.h"
+#include "llcallstack.h"
+#include "StackWalker.h"
+
+#if LL_WINDOWS
+class LLCallStackImpl: public StackWalker
+{
+public:
+    LLCallStackImpl():
+        StackWalker(false,0) // non-verbose, options = 0
+    {
+    }
+    ~LLCallStackImpl()
+    {
+    }
+    void getStack(std::vector<std::string>& stack)
+    {
+        m_stack.clear();
+        ShowCallstack();
+        // Skip the first 2 lines because they're just bookkeeping for LLCallStack.
+        for (S32 i=3; i<m_stack.size(); ++i)
+        {
+            stack.push_back(m_stack[i]);
+        }
+    }
+protected:
+    virtual void OnOutput(LPCSTR szText)
+    {
+        m_stack.push_back(szText);
+    }
+    std::vector<std::string> m_stack;
+};
+#else
+// Stub - not implemented currently on other platforms.
+class LLCallStackImpl
+{
+public:
+    LLCallStackImpl() {}
+    ~LLCallStackImpl() {}
+    void getStack(std::vector<std::string>& stack)
+    {
+        stack.clear();
+    }
+};
+#endif
+
+LLCallStackImpl *LLCallStack::s_impl = NULL;
+
+LLCallStack::LLCallStack()
+{
+    if (!s_impl)
+    {
+        s_impl = new LLCallStackImpl;
+    }
+    LLTimer t;
+    s_impl->getStack(m_strings);
+}
+
+std::ostream& operator<<(std::ostream& s, const LLCallStack& call_stack)
+{
+    std::vector<std::string>::const_iterator it;
+    for (it=call_stack.m_strings.begin(); it!=call_stack.m_strings.end(); ++it)
+    {
+        s << *it;
+    }
+    return s;
+}
-- 
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