Optimize frame printing

include/boost/stacktrace/detail/backend.hpp

@@ -71,6 +71,7 @@ public:
     BOOST_STACKTRACE_FUNCTION static std::string get_name(const void* addr);
     BOOST_STACKTRACE_FUNCTION static std::string get_source_file(const void* addr);
     BOOST_STACKTRACE_FUNCTION static std::size_t get_source_line(const void* addr);
+    BOOST_STACKTRACE_FUNCTION static std::string to_string(const void* addr);
 };
 
 }}} // namespace boost::stacktrace::detail

include/boost/stacktrace/detail/backend_noop.hpp

@@ -31,6 +31,10 @@ std::size_t backend::get_source_line(const void* /*addr*/) {
     return 0;
 }
 
+std::string backend::to_string(const void* /*addr*/) {
+    return std::string();
+}
+
 }}} // namespace boost::stacktrace::detail
 
 #endif // BOOST_STACKTRACE_DETAIL_BACKEND_LIBUNWIND_HPP

include/boost/stacktrace/detail/backend_posix.hpp

@@ -239,6 +239,11 @@ std::size_t backend::get_source_line(const void* addr) {
     return line_num;
 }
 
+std::string backend::to_string(const void* addr) {
+    return get_name(addr) + " at " + addr2line("-Cpe", addr);
+    //return addr2line("-Cfipe", addr); // Does not seem to work in all cases
+}
+
 }}} // namespace boost::stacktrace::detail
 
 #endif // BOOST_STACKTRACE_DETAIL_BACKEND_POSIX_HPP

include/boost/stacktrace/detail/backend_windows.hpp

@@ -13,6 +13,7 @@
 #endif
 
 #include <boost/core/noncopyable.hpp>
+#include <boost/lexical_cast.hpp>
 #include <windows.h>
 #include "Dbgeng.h"
 
@@ -228,6 +229,24 @@ std::size_t backend::get_source_line(const void* addr) {
 }
 
 
+std::string backend::to_string(const void* addr) {
+    com_global_initer com_guard;
+    com_holder<IDebugSymbols> idebug(com_guard);
+    if (!boost::stacktrace::detail::try_init_com(idebug, com_guard)) {
+        return std::string();
+    }
+
+    std::pair<std::string, std::size_t> file_line
+        = boost::stacktrace::detail::get_source_file_line_impl(idebug, addr);
+
+    return boost::stacktrace::detail::get_name_impl(idebug, addr)
+        + " at "
+        + file_line.first
+        + ':'
+        + boost::lexical_cast<std::string>(file_line.second)
+    ;
+}
+
 }}} // namespace boost::stacktrace::detail
 
 #endif // BOOST_STACKTRACE_DETAIL_BACKEND_LINUX_HPP

include/boost/stacktrace/frame.hpp

@@ -137,19 +137,7 @@ inline std::size_t hash_value(const frame& f) BOOST_NOEXCEPT {
 /// Outputs stacktrace::frame in a human readable format to output stream; unsafe to use in async handlers.
 template <class CharT, class TraitsT>
 std::basic_ostream<CharT, TraitsT>& operator<<(std::basic_ostream<CharT, TraitsT>& os, const frame& f) {
-    std::string name = f.name();
-    if (!name.empty()) {
-        os << name;
-    } else {
-        os << f.address();
-    }
-
-    const std::size_t source_line = f.source_line();
-    if (source_line) {
-        os << " at " << f.source_file() << ':' << source_line;
-    }
-
-    return os;
+    return os << boost::stacktrace::detail::backend::to_string(f.address());
 }
 
 }} // namespace boost::stacktrace