update boost on linux

linx64/include/boost/stacktrace/detail/libbacktrace_impls.hpp

@@ -0,0 +1,236 @@
+// Copyright Antony Polukhin, 2016-2019.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_STACKTRACE_DETAIL_LIBBACKTRACE_IMPLS_HPP
+#define BOOST_STACKTRACE_DETAIL_LIBBACKTRACE_IMPLS_HPP
+
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+#include <boost/stacktrace/detail/to_hex_array.hpp>
+#include <boost/stacktrace/detail/to_dec_array.hpp>
+#include <boost/stacktrace/detail/location_from_symbol.hpp>
+#include <boost/core/demangle.hpp>
+
+#ifdef BOOST_STACKTRACE_BACKTRACE_INCLUDE_FILE
+#   include BOOST_STACKTRACE_BACKTRACE_INCLUDE_FILE
+#else
+#   include <backtrace.h>
+#endif
+
+namespace boost { namespace stacktrace { namespace detail {
+
+
+struct pc_data {
+    std::string* function;
+    std::string* filename;
+    std::size_t line;
+};
+
+inline void libbacktrace_syminfo_callback(void *data, uintptr_t /*pc*/, const char *symname, uintptr_t /*symval*/, uintptr_t /*symsize*/) {
+    pc_data& d = *static_cast<pc_data*>(data);
+    if (d.function && symname) {
+        *d.function = symname;
+    }
+}
+
+// Old versions of libbacktrace have different signature for the callback
+inline void libbacktrace_syminfo_callback(void *data, uintptr_t pc, const char *symname, uintptr_t symval) {
+    boost::stacktrace::detail::libbacktrace_syminfo_callback(data, pc, symname, symval, 0);
+}
+
+inline int libbacktrace_full_callback(void *data, uintptr_t /*pc*/, const char *filename, int lineno, const char *function) {
+    pc_data& d = *static_cast<pc_data*>(data);
+    if (d.filename && filename) {
+        *d.filename = filename;
+    }
+    if (d.function && function) {
+        *d.function = function;
+    }
+    d.line = lineno;
+    return 0;
+}
+
+inline void libbacktrace_error_callback(void* /*data*/, const char* /*msg*/, int /*errnum*/) BOOST_NOEXCEPT {
+    // Do nothing, just return.
+}
+
+// Not async-signal-safe, so this method is not called from async-safe functions.
+//
+// This function is not async signal safe because:
+// * Dynamic initialization of a block-scope variable with static storage duration could lock a mutex
+// * No guarantees on `backtrace_create_state` function.
+//
+// Currently `backtrace_create_state` can not detect file name on Windows https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82543
+// That's why we provide a `prog_location` here.
+BOOST_SYMBOL_VISIBLE inline ::backtrace_state* construct_state(const program_location& prog_location) BOOST_NOEXCEPT {
+    // [dcl.inline]: A static local variable in an inline function with external linkage always refers to the same object.
+
+    // TODO: The most obvious solution:
+    //
+    //static ::backtrace_state* state = ::backtrace_create_state(
+    //    prog_location.name(),
+    //    1, // allow safe concurrent usage of the same state
+    //    boost::stacktrace::detail::libbacktrace_error_callback,
+    //    0 // pointer to data that will be passed to callback
+    //);
+    //
+    //
+    // Unfortunately, that solution segfaults when `construct_state()` function is in .so file
+    // and multiple threads concurrently work with state.
+
+
+#ifndef BOOST_HAS_THREADS
+    static
+#else
+
+    // Result of `construct_state()` invocation is not stored by the callers, so `thread_local`
+    // gives a single `state` per thread and that state is not shared between threads in any way.
+
+#   ifndef BOOST_NO_CXX11_THREAD_LOCAL
+    thread_local
+#   elif defined(__GNUC__)
+    static __thread
+#   else
+    /* just a local variable */
+#   endif
+
+#endif
+      ::backtrace_state* state = ::backtrace_create_state(
+        prog_location.name(),
+        0,
+        boost::stacktrace::detail::libbacktrace_error_callback,
+        0
+    );
+    return state;
+}
+
+struct to_string_using_backtrace {
+    std::string res;
+    boost::stacktrace::detail::program_location prog_location;
+    ::backtrace_state* state;
+    std::string filename;
+    std::size_t line;
+
+    void prepare_function_name(const void* addr) {
+        boost::stacktrace::detail::pc_data data = {&res, &filename, 0};
+        if (state) {
+            ::backtrace_pcinfo(
+                state,
+                reinterpret_cast<uintptr_t>(addr),
+                boost::stacktrace::detail::libbacktrace_full_callback,
+                boost::stacktrace::detail::libbacktrace_error_callback,
+                &data
+            ) 
+            ||
+            ::backtrace_syminfo(
+                state,
+                reinterpret_cast<uintptr_t>(addr),
+                boost::stacktrace::detail::libbacktrace_syminfo_callback,
+                boost::stacktrace::detail::libbacktrace_error_callback,
+                &data
+            );
+        }
+        line = data.line;
+    }
+
+    bool prepare_source_location(const void* /*addr*/) {
+        if (filename.empty() || !line) {
+            return false;
+        }
+
+        res += " at ";
+        res += filename;
+        res += ':';
+        res += boost::stacktrace::detail::to_dec_array(line).data();
+        return true;
+    }
+
+    to_string_using_backtrace() BOOST_NOEXCEPT {
+        state = boost::stacktrace::detail::construct_state(prog_location);
+    }
+};
+
+template <class Base> class to_string_impl_base;
+typedef to_string_impl_base<to_string_using_backtrace> to_string_impl;
+
+inline std::string name_impl(const void* addr) {
+    std::string res;
+
+    boost::stacktrace::detail::program_location prog_location;
+    ::backtrace_state* state = boost::stacktrace::detail::construct_state(prog_location);
+
+    boost::stacktrace::detail::pc_data data = {&res, 0, 0};
+    if (state) {
+        ::backtrace_pcinfo(
+            state,
+            reinterpret_cast<uintptr_t>(addr),
+            boost::stacktrace::detail::libbacktrace_full_callback,
+            boost::stacktrace::detail::libbacktrace_error_callback,
+            &data
+        )
+        ||
+        ::backtrace_syminfo(
+            state,
+            reinterpret_cast<uintptr_t>(addr),
+            boost::stacktrace::detail::libbacktrace_syminfo_callback,
+            boost::stacktrace::detail::libbacktrace_error_callback,
+            &data
+        );
+    }
+    if (!res.empty()) {
+        res = boost::core::demangle(res.c_str());
+    }
+
+    return res;
+}
+
+} // namespace detail
+
+std::string frame::source_file() const {
+    std::string res;
+
+    boost::stacktrace::detail::program_location prog_location;
+    ::backtrace_state* state = boost::stacktrace::detail::construct_state(prog_location);
+
+    boost::stacktrace::detail::pc_data data = {0, &res, 0};
+    if (state) {
+        ::backtrace_pcinfo(
+            state,
+            reinterpret_cast<uintptr_t>(addr_),
+            boost::stacktrace::detail::libbacktrace_full_callback,
+            boost::stacktrace::detail::libbacktrace_error_callback,
+            &data
+        );
+    }
+
+    return res;
+}
+
+std::size_t frame::source_line() const {
+    boost::stacktrace::detail::program_location prog_location;
+    ::backtrace_state* state = boost::stacktrace::detail::construct_state(prog_location);
+
+    boost::stacktrace::detail::pc_data data = {0, 0, 0};
+    if (state) {
+        ::backtrace_pcinfo(
+            state,
+            reinterpret_cast<uintptr_t>(addr_),
+            boost::stacktrace::detail::libbacktrace_full_callback,
+            boost::stacktrace::detail::libbacktrace_error_callback,
+            &data
+        );
+    }
+
+    return data.line;
+}
+
+
+}} // namespace boost::stacktrace
+
+#endif // BOOST_STACKTRACE_DETAIL_LIBBACKTRACE_IMPLS_HPP