From 5c761256265b1ec48d02c462212d1238ddc0d6e2 Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Fri, 19 Jun 2015 03:25:18 +0300
Subject: add call stacks to errors

---
 cxx/include/aesnixx/debug.hpp | 123 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 cxx/include/aesnixx/debug.hpp

(limited to 'cxx/include/aesnixx/debug.hpp')

diff --git a/cxx/include/aesnixx/debug.hpp b/cxx/include/aesnixx/debug.hpp
new file mode 100644
index 0000000..f87942d
--- /dev/null
+++ b/cxx/include/aesnixx/debug.hpp
@@ -0,0 +1,123 @@
+/**
+ * \file
+ * \author Egor Tensin <Egor.Tensin@gmail.com>
+ * \date 2015
+ * \copyright This file is licensed under the terms of the MIT License.
+ *            See LICENSE.txt for details.
+ */
+
+#pragma once
+
+#ifdef WIN32
+#include <Windows.h>
+#include <DbgHelp.h>
+#pragma comment(lib, "dbghelp.lib")
+#endif
+
+#include <cstddef>
+
+#include <sstream>
+#include <string>
+
+namespace aesni
+{
+    namespace aux
+    {
+        class CallStackFormatter
+        {
+        public:
+            CallStackFormatter()
+            {
+                #ifdef WIN32
+                m_valid = SymInitialize(GetCurrentProcess(), NULL, TRUE) ? true : false;
+                #endif
+            }
+
+            std::string format(void* addr) const
+            {
+                #ifdef WIN32
+                if (!m_valid)
+                    return format_fallback(addr);
+
+                DWORD64 symbol_info_buf[sizeof(SYMBOL_INFO) + MAX_SYM_NAME];
+                PSYMBOL_INFO symbol_info = (PSYMBOL_INFO) symbol_info_buf;
+                symbol_info->SizeOfStruct = sizeof(SYMBOL_INFO);
+                symbol_info->MaxNameLen = MAX_SYM_NAME;
+
+                IMAGEHLP_MODULE64 module_info;
+                module_info.SizeOfStruct = sizeof(IMAGEHLP_MODULE64);
+
+                DWORD64 displacement_within_symbol;
+
+                if (!SymFromAddr(GetCurrentProcess(), reinterpret_cast<DWORD64>(addr), &displacement_within_symbol, symbol_info))
+                {
+                    if (!SymGetModuleInfo64(GetCurrentProcess(), reinterpret_cast<DWORD64>(addr), &module_info))
+                        return format_fallback(addr);
+
+                    void* const displacement_within_module = reinterpret_cast<char*>(addr) - module_info.BaseOfImage;
+                    return format_with_module(module_info.ModuleName, displacement_within_module);
+                }
+
+                if (!SymGetModuleInfo64(GetCurrentProcess(), symbol_info->ModBase, &module_info))
+                    return format_with_symbol(symbol_info->Name, addr);
+
+                return format_with_symbol_and_module(symbol_info->Name, module_info.ModuleName, reinterpret_cast<void*>(displacement_within_symbol));
+                #else
+                return format_fallback(addr);
+                #endif
+            }
+
+            ~CallStackFormatter()
+            {
+                #ifdef WIN32
+                if (m_valid)
+                    SymCleanup(GetCurrentProcess());
+                #endif
+            }
+
+        private:
+            template <typename T>
+            static std::string put_between_brackets(const T& x)
+            {
+                std::ostringstream oss;
+                oss << "[" << x << "]";
+                return oss.str();
+            }
+
+            template <typename T>
+            static std::string stringify(const T& x)
+            {
+                std::ostringstream oss;
+                oss << x;
+                return oss.str();
+            }
+
+            std::string format_fallback(void* addr) const
+            {
+                return put_between_brackets(addr);
+            }
+
+            std::string format_with_module(const std::string& module_name, void* displacement) const
+            {
+                if (displacement == NULL)
+                    return put_between_brackets(module_name);
+                else
+                    return put_between_brackets(module_name + "+" + stringify(displacement));
+            }
+
+            std::string format_with_symbol(const std::string& symbol_name, void* displacement) const
+            {
+                return format_with_module(symbol_name, displacement);
+            }
+
+            std::string format_with_symbol_and_module(const std::string& symbol_name, const std::string& module_name, void* displacement) const
+            {
+                return format_with_symbol(module_name + "!" + symbol_name, displacement);
+            }
+
+            #ifdef WIN32
+            bool m_valid = false;
+            #endif
+        };
+    }
+}
-- 
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