feat(core): internal changes to exception types

See comments.

GitOrigin-RevId: ecd3c22faaf425d0e5f11661c2cd9250029f21f6

src/core/impl/exception.cpp

@@ -35,15 +35,14 @@ namespace {
     MegDNNErrorHandler MegDNNErrorHandler::inst;
 }
 
-MegBrainError::MegBrainError(const std::string &msg):
-    m_msg(msg)
+void MegBrainError::init()
 {
     m_msg.append("\n");
 #if MGB_ENABLE_DEBUG_UTIL
     debug::backtrace(2).fmt_to_str(m_msg);
     static bool print_exc = MGB_GETENV("MGB_PRINT_EXC");
     if (print_exc) {
-        fprintf(stderr, "mgb: exception occurred: %s\n", msg.c_str());
+        fprintf(stderr, "mgb: exception occurred: %s\n", m_msg.c_str());
     }
 #endif
 }

src/core/include/megbrain/exception.h

@@ -90,7 +90,7 @@ class MegBrainError: public std::exception {
                 virtual ~ExtraInfo() = default;
         };
 
-        MegBrainError(const std::string &msg);
+        MegBrainError(const std::string& msg) : m_msg(msg) { init(); }
 
         const char *what() const noexcept override {
             return m_msg.c_str();
@@ -116,6 +116,7 @@ class MegBrainError: public std::exception {
 
     private:
         std::shared_ptr<ExtraInfo> m_extra_info;
+        void init();
 };
 
 //! base class for system error: error caused by uncontrollable environment
@@ -188,8 +189,14 @@ class TimeoutError final: public MegBrainError {
         using MegBrainError::MegBrainError;
 };
 
+
+}  // namespace mgb
+
+namespace mgb {
+
 bool has_uncaught_exception();
 
 }  // namespace mgb
 
+
 // vim: syntax=cpp.doxygen foldmethod=marker foldmarker=f{{{,f}}}