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538 lines
17 KiB
C++
538 lines
17 KiB
C++
// (C) Copyright Gennadiy Rozental 2005-2008.
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// Use, modification, and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/test for the library home page.
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//
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// File : $RCSfile$
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//
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// Version : $Revision$
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//
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// Description : Facilities to perform exception safety tests
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// ***************************************************************************
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#ifndef BOOST_TEST_EXECUTION_SAFETY_IPP_112005GER
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#define BOOST_TEST_EXECUTION_SAFETY_IPP_112005GER
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// Boost.Test
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#include <boost/test/detail/config.hpp>
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#if BOOST_TEST_SUPPORT_INTERACTION_TESTING
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#include <boost/test/detail/global_typedef.hpp>
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#include <boost/test/detail/unit_test_parameters.hpp>
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#include <boost/test/utils/callback.hpp>
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#include <boost/test/utils/wrap_stringstream.hpp>
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#include <boost/test/utils/iterator/token_iterator.hpp>
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#include <boost/test/interaction_based.hpp>
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#include <boost/test/test_tools.hpp>
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#include <boost/test/unit_test_log.hpp>
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#include <boost/test/framework.hpp>
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#include <boost/test/test_observer.hpp>
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#include <boost/test/debug.hpp>
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#include <boost/test/detail/suppress_warnings.hpp>
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// Boost
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#include <boost/lexical_cast.hpp>
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// STL
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#include <vector>
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#include <cstdlib>
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#include <map>
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#include <iomanip>
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#include <cctype>
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#include <boost/limits.hpp>
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//____________________________________________________________________________//
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namespace boost {
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using namespace ::boost::unit_test;
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namespace itest {
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// ************************************************************************** //
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// ************** execution_path_point ************** //
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// ************************************************************************** //
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enum exec_path_point_type { EPP_SCOPE, EPP_EXCEPT, EPP_DECISION, EPP_ALLOC };
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struct execution_path_point {
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execution_path_point( exec_path_point_type t, const_string file, std::size_t line_num )
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: m_type( t )
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, m_file_name( file )
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, m_line_num( line_num )
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{}
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exec_path_point_type m_type;
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const_string m_file_name;
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std::size_t m_line_num;
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// Execution path point specific
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struct decision_data {
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bool value;
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unsigned forced_exception_point;
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};
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struct scope_data {
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unsigned size;
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char const* name;
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};
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struct except_data {
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char const* description;
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};
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struct alloc_data {
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void* ptr;
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std::size_t size;
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};
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union {
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struct decision_data m_decision;
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struct scope_data m_scope;
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struct except_data m_except;
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struct alloc_data m_alloc;
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};
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};
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// ************************************************************************** //
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// ************** exception safety test implementation ************** //
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// ************************************************************************** //
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struct exception_safety_tester : itest::manager, test_observer {
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// helpers types
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struct unique_exception {};
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// Constructor
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explicit exception_safety_tester( const_string test_name );
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~exception_safety_tester();
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// check last run and prepare for next
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bool next_execution_path();
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// memory tracking
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// manager interface implementation
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virtual void exception_point( const_string file, std::size_t line_num, const_string description );
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virtual bool decision_point( const_string file, std::size_t line_num );
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virtual unsigned enter_scope( const_string file, std::size_t line_num, const_string scope_name );
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virtual void leave_scope( unsigned enter_scope_point );
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virtual void allocated( const_string file, std::size_t line_num, void* p, std::size_t s );
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virtual void freed( void* p );
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// test observer interface
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virtual void assertion_result( bool passed );
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virtual int priority() { return (std::numeric_limits<int>::max)(); } // we want this observer to run the last
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private:
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void failure_point();
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void report_error();
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typedef std::vector<execution_path_point> exec_path;
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typedef std::map<void*,unsigned> registry;
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// Data members
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bool m_internal_activity;
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unsigned m_exception_point_counter;
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unsigned m_forced_exception_point;
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unsigned m_exec_path_point;
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exec_path m_execution_path;
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unsigned m_exec_path_counter;
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unsigned m_break_exec_path;
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bool m_invairant_failed;
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registry m_memory_in_use;
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};
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//____________________________________________________________________________//
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struct activity_guard {
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bool& m_v;
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activity_guard( bool& v ) : m_v( v ) { m_v = true; }
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~activity_guard() { m_v = false; }
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};
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//____________________________________________________________________________//
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exception_safety_tester::exception_safety_tester( const_string test_name )
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: m_internal_activity( true )
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, m_exception_point_counter( 0 )
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, m_forced_exception_point( 1 )
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, m_exec_path_point( 0 )
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, m_exec_path_counter( 1 )
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, m_break_exec_path( static_cast<unsigned>(-1) )
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, m_invairant_failed( false )
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{
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framework::register_observer( *this );
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if( !runtime_config::break_exec_path().is_empty() ) {
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using namespace unit_test;
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string_token_iterator tit( runtime_config::break_exec_path(),
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(dropped_delimeters = ":",kept_delimeters = " ") );
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const_string test_to_break = *tit;
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if( test_to_break == test_name ) {
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++tit;
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m_break_exec_path = lexical_cast<unsigned>( *tit );
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}
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}
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m_internal_activity = false;
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}
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//____________________________________________________________________________//
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exception_safety_tester::~exception_safety_tester()
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{
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m_internal_activity = true;
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framework::deregister_observer( *this );
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}
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//____________________________________________________________________________//
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bool
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exception_safety_tester::next_execution_path()
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{
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activity_guard ag( m_internal_activity );
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// check memory usage
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if( m_execution_path.size() > 0 ) {
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bool errors_detected = m_invairant_failed || (m_memory_in_use.size() != 0);
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framework::assertion_result( !errors_detected );
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if( errors_detected )
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report_error();
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m_memory_in_use.clear();
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}
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m_exec_path_point = 0;
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m_exception_point_counter = 0;
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m_invairant_failed = false;
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++m_exec_path_counter;
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while( m_execution_path.size() > 0 ) {
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switch( m_execution_path.back().m_type ) {
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case EPP_SCOPE:
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case EPP_ALLOC:
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m_execution_path.pop_back();
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break;
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case EPP_DECISION:
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if( !m_execution_path.back().m_decision.value ) {
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m_execution_path.pop_back();
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break;
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}
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m_execution_path.back().m_decision.value = false;
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m_forced_exception_point = m_execution_path.back().m_decision.forced_exception_point;
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return true;
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case EPP_EXCEPT:
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m_execution_path.pop_back();
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++m_forced_exception_point;
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return true;
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}
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}
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BOOST_TEST_MESSAGE( "Total tested " << --m_exec_path_counter << " execution path" );
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return false;
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}
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//____________________________________________________________________________//
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void
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exception_safety_tester::exception_point( const_string file, std::size_t line_num, const_string description )
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{
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activity_guard ag( m_internal_activity );
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if( ++m_exception_point_counter == m_forced_exception_point ) {
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m_execution_path.push_back(
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execution_path_point( EPP_EXCEPT, file, line_num ) );
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m_execution_path.back().m_except.description = description.begin();
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++m_exec_path_point;
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failure_point();
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}
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}
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//____________________________________________________________________________//
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bool
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exception_safety_tester::decision_point( const_string file, std::size_t line_num )
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{
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activity_guard ag( m_internal_activity );
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if( m_exec_path_point < m_execution_path.size() ) {
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BOOST_REQUIRE_MESSAGE( m_execution_path[m_exec_path_point].m_type == EPP_DECISION &&
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m_execution_path[m_exec_path_point].m_file_name == file &&
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m_execution_path[m_exec_path_point].m_line_num == line_num,
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"Function under test exibit non-deterministic behavior" );
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}
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else {
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m_execution_path.push_back(
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execution_path_point( EPP_DECISION, file, line_num ) );
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m_execution_path.back().m_decision.value = true;
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m_execution_path.back().m_decision.forced_exception_point = m_forced_exception_point;
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}
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return m_execution_path[m_exec_path_point++].m_decision.value;
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}
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//____________________________________________________________________________//
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unsigned
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exception_safety_tester::enter_scope( const_string file, std::size_t line_num, const_string scope_name )
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{
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activity_guard ag( m_internal_activity );
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if( m_exec_path_point < m_execution_path.size() ) {
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BOOST_REQUIRE_MESSAGE( m_execution_path[m_exec_path_point].m_type == EPP_SCOPE &&
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m_execution_path[m_exec_path_point].m_file_name == file &&
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m_execution_path[m_exec_path_point].m_line_num == line_num,
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"Function under test exibit non-deterministic behavior" );
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}
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else {
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m_execution_path.push_back(
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execution_path_point( EPP_SCOPE, file, line_num ) );
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}
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m_execution_path[m_exec_path_point].m_scope.size = 0;
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m_execution_path[m_exec_path_point].m_scope.name = scope_name.begin();
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return m_exec_path_point++;
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}
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//____________________________________________________________________________//
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void
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exception_safety_tester::leave_scope( unsigned enter_scope_point )
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{
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activity_guard ag( m_internal_activity );
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BOOST_REQUIRE_MESSAGE( m_execution_path[enter_scope_point].m_type == EPP_SCOPE,
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"Function under test exibit non-deterministic behavior" );
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m_execution_path[enter_scope_point].m_scope.size = m_exec_path_point - enter_scope_point;
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}
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//____________________________________________________________________________//
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void
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exception_safety_tester::allocated( const_string file, std::size_t line_num, void* p, std::size_t s )
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{
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if( m_internal_activity )
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return;
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activity_guard ag( m_internal_activity );
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if( m_exec_path_point < m_execution_path.size() )
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BOOST_REQUIRE_MESSAGE( m_execution_path[m_exec_path_point].m_type == EPP_ALLOC,
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"Function under test exibit non-deterministic behavior" );
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else
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m_execution_path.push_back(
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execution_path_point( EPP_ALLOC, file, line_num ) );
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m_execution_path[m_exec_path_point].m_alloc.ptr = p;
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m_execution_path[m_exec_path_point].m_alloc.size = s;
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m_memory_in_use.insert( std::make_pair( p, m_exec_path_point++ ) );
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}
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//____________________________________________________________________________//
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void
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exception_safety_tester::freed( void* p )
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{
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if( m_internal_activity )
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return;
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activity_guard ag( m_internal_activity );
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registry::iterator it = m_memory_in_use.find( p );
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if( it != m_memory_in_use.end() ) {
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m_execution_path[it->second].m_alloc.ptr = 0;
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m_memory_in_use.erase( it );
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}
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}
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//____________________________________________________________________________//
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void
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exception_safety_tester::assertion_result( bool passed )
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{
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if( !m_internal_activity && !passed ) {
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m_invairant_failed = true;
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failure_point();
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}
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}
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//____________________________________________________________________________//
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void
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exception_safety_tester::failure_point()
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{
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if( m_exec_path_counter == m_break_exec_path )
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debug::debugger_break();
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throw unique_exception();
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}
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//____________________________________________________________________________//
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namespace {
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inline void
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format_location( wrap_stringstream& formatter, execution_path_point const& /*p*/, unsigned indent )
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{
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if( indent )
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formatter << std::left << std::setw( indent ) << "";
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// !! ?? optional if( p.m_file_name )
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// formatter << p.m_file_name << '(' << p.m_line_num << "): ";
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}
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//____________________________________________________________________________//
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template<typename ExecPathIt>
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inline void
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format_execution_path( wrap_stringstream& formatter, ExecPathIt it, ExecPathIt end, unsigned indent = 0 )
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{
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while( it != end ) {
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switch( it->m_type ) {
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case EPP_SCOPE:
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format_location( formatter, *it, indent );
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formatter << "> \"" << it->m_scope.name << "\"\n";
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format_execution_path( formatter, it+1, it + it->m_scope.size, indent + 2 );
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format_location( formatter, *it, indent );
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formatter << "< \"" << it->m_scope.name << "\"\n";
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it += it->m_scope.size;
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break;
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case EPP_DECISION:
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format_location( formatter, *it, indent );
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formatter << "Decision made as " << std::boolalpha << it->m_decision.value << '\n';
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++it;
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break;
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case EPP_EXCEPT:
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format_location( formatter, *it, indent );
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formatter << "Forced failure";
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if( it->m_except.description )
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formatter << ": " << it->m_except.description;
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formatter << "\n";
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++it;
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break;
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case EPP_ALLOC:
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if( it->m_alloc.ptr ) {
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format_location( formatter, *it, indent );
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formatter << "Allocated memory block 0x" << std::uppercase << it->m_alloc.ptr
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<< ", " << it->m_alloc.size << " bytes long: <";
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unsigned i;
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for( i = 0; i < std::min<std::size_t>( it->m_alloc.size, 8 ); i++ ) {
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unsigned char c = static_cast<unsigned char*>(it->m_alloc.ptr)[i];
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if( (std::isprint)( c ) )
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formatter << c;
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else
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formatter << '.';
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}
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formatter << "> ";
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for( i = 0; i < std::min<std::size_t>( it->m_alloc.size, 8 ); i++ ) {
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unsigned c = static_cast<unsigned char*>(it->m_alloc.ptr)[i];
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formatter << std::hex << std::uppercase << c << ' ';
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}
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formatter << "\n";
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}
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++it;
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break;
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}
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}
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}
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//____________________________________________________________________________//
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} // local namespace
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void
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exception_safety_tester::report_error()
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{
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activity_guard ag( m_internal_activity );
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unit_test_log << unit_test::log::begin( m_execution_path.back().m_file_name,
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m_execution_path.back().m_line_num )
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<< log_all_errors;
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wrap_stringstream formatter;
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if( m_invairant_failed )
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formatter << "Failed invariant";
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if( m_memory_in_use.size() != 0 ) {
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if( m_invairant_failed )
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formatter << " and ";
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formatter << static_cast<unsigned int>(m_memory_in_use.size()) << " memory leak";
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if( m_memory_in_use.size() > 1 )
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formatter << 's';
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}
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formatter << " detected in the execution path " << m_exec_path_counter << ":\n";
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format_execution_path( formatter, m_execution_path.begin(), m_execution_path.end() );
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unit_test_log << const_string( formatter.str() ) << unit_test::log::end();
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}
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//____________________________________________________________________________//
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// ************************************************************************** //
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// ************** exception safety test ************** //
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// ************************************************************************** //
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void BOOST_TEST_DECL
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exception_safety( callback0<> const& F, const_string test_name )
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{
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exception_safety_tester est( test_name );
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do {
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try {
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F();
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}
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catch( exception_safety_tester::unique_exception const& ) {}
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} while( est.next_execution_path() );
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}
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//____________________________________________________________________________//
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} // namespace itest
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} // namespace boost
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//____________________________________________________________________________//
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#include <boost/test/detail/enable_warnings.hpp>
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#endif // non-ancient compiler
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#endif // BOOST_TEST_EXECUTION_SAFETY_IPP_112005GER
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