add call stacks to errors

1 files changed, 55 insertions, 6 deletions

diff --git a/cxx/include/aesnixx/error.hpp b/cxx/include/aesnixx/error.hpp
index 4c1fc98..013e2ef 100644
--- a/cxx/include/aesnixx/error.hpp
+++ b/cxx/include/aesnixx/error.hpp
@@ -8,16 +8,70 @@
 
 #pragma once
 
+#include "debug.hpp"
+
 #include <aesni/all.h>
 
 #include <cstdlib>
+#include <cstring>
 
+#include <algorithm>
+#include <functional>
+#include <ostream>
 #include <stdexcept>
 #include <string>
 #include <vector>
 
 namespace aesni
 {
+    class Error : public std::runtime_error
+    {
+    public:
+        Error(const AesNI_ErrorDetails& err_details)
+            : std::runtime_error(format_error_message(err_details))
+        {
+            copy_call_stack(err_details);
+        }
+
+        void for_each_in_call_stack(const std::function<void (void*, const std::string&)>& callback) const
+        {
+            aux::CallStackFormatter formatter;
+            std::for_each(m_call_stack, m_call_stack + m_call_stack_size, [&formatter, &callback] (void* addr)
+            {
+                callback(addr, formatter.format(addr));
+            });
+        }
+
+    private:
+        static std::string format_error_message(const AesNI_ErrorDetails& err_details)
+        {
+            std::vector<char> buf;
+            buf.resize(aesni_format_error(&err_details, NULL, 0));
+            aesni_format_error(&err_details, buf.data(), buf.size());
+            return { buf.begin(), buf.end() };
+        }
+
+        void copy_call_stack(const AesNI_ErrorDetails& err_details)
+        {
+            m_call_stack_size = err_details.call_stack_size;
+            std::memcpy(m_call_stack, err_details.call_stack, m_call_stack_size * sizeof(void*));
+        }
+
+        void* m_call_stack[AESNI_MAX_CALL_STACK_LENGTH];
+        std::size_t m_call_stack_size;
+    };
+
+    std::ostream& operator<<(std::ostream& os, const Error& e)
+    {
+        os << "AesNI error: " << e.what() << '\n';
+        os << "Call stack:\n";
+        e.for_each_in_call_stack([&os] (void* addr, const std::string& name)
+        {
+            os << '\t' << addr << ' ' << name << '\n';
+        });
+        return os;
+    }
+
     class ErrorDetailsThrowsInDestructor
     {
     public:
@@ -29,12 +83,7 @@ namespace aesni
         ~ErrorDetailsThrowsInDestructor()
         {
             if (aesni_is_error(aesni_get_error_code(get())))
-            {
-                std::vector<char> msg;
-                msg.resize(aesni_format_error(get(), NULL, 0));
-                aesni_format_error(get(), msg.data(), msg.size());
-                throw std::runtime_error(std::string(msg.begin(), msg.end()));
-            }
+                throw Error(m_impl);
         }
 
         AesNI_ErrorDetails* get() { return &m_impl; }