Context.cpp

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/*
 *  Context.cxx
 *  ers
 *
 *  Created by Serguei Kolos on 26.11.05.
 *  Copyright 2004 CERN. All rights reserved.
 *
 */
#include <string.h>
#include <cxxabi.h>
#include <sys/types.h>
#include <pwd.h>
#include <unistd.h>
 
#include <iostream>
#include <sstream>
 
#ifndef __rtems__
#include <execinfo.h>
#else
char** backtrace_symbols (void ** , int size) {
    return 0;
}
#endif
 
#include <ers/Context.hpp>
#include <ers/Configuration.hpp>
 
namespace
{
    std::string
    demangle( char * mangled )
    {
        int status;
    char * function_begin = ::strchr( mangled, '(' );
        if ( function_begin ) {
            char * function_end = ::strchr( ++function_begin, '+' );
            if ( function_end && function_end != function_begin)
            {
                std::string fname(function_begin, function_end - function_begin);
                char * name = abi::__cxa_demangle( fname.c_str(), 0, 0, &status );
 
                if (!name) {
                    return std::string( mangled );
                }
 
                std::ostringstream out;
                out << std::string(mangled, function_begin - mangled) << name << function_end;
                free( name );
                return out.str();
            }
        }
    return std::string( mangled );
    }
 
    void
    print_function( std::ostream & out, const char * function, int verbosity )
    {
    if ( verbosity )
        {
        out << function;
            return;
        }
        
        const char * end = strchr( function, '(' );
    if ( end )
    {
        const char * beg = end;
        while ( beg > function ) {
            if ( *(beg-1) == ' ' ) {
                break;
            }
            --beg;
        }
            out.write( beg, end - beg );
            out << "(...)";
    } else {
        out << function;
    }
    }
}
 
std::vector<std::string>
ers::Context::stack( ) const
{
    std::vector<std::string>    stack;
    stack.reserve( stack_size() );
    char ** symbols = backtrace_symbols( (void**)stack_symbols(), stack_size() );
    
    if (symbols) {
        for (int i = 1; i < stack_size(); i++) {
            stack.push_back( demangle(symbols[i]) );
        }
        free(symbols);
    }
 
    return stack;
}
 
std::string
ers::Context::position( int verbosity ) const
{
    std::ostringstream out;
    print_function( out, function_name(), verbosity );
    out << " at ";
    
    const char * file = file_name();
    if (    file[0] == '.'
        &&  file[1] == '.'
        &&  file[2] == '/' ) // file name starts with "../"
    {
    out << package_name() << (file + 2);
    } else {
    out << file;
    }
    out << ":" << line_number();
    return out.str();
}