mu - Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

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bool Hide_warnings = false; struct trace_stream { vector<pair<string, string> > past_lines; // [(layer label, line)] // accumulator for current line ostringstream* curr_stream; string curr_layer; trace_stream() :curr_stream(NULL) {} ~trace_stream() { if (curr_stream) delete curr_stream; } ostringstream& stream(string layer) { newline(); curr_stream = new ostringstream; curr_layer = layer; return *curr_stream; } // be sure to call this before messing with curr_stream or curr_layer void newline() { if (!curr_stream) return; string curr_contents = curr_stream->str(); curr_contents.erase(curr_contents.find_last_not_of("\r\n")+1); past_lines.push_back(pair<string, string>(curr_layer, curr_contents)); delete curr_stream; curr_stream = NULL; } string readable_contents(string layer) { // missing layer = everything newline(); ostringstream output; for (vector<pair<string, string> >::iterator p = past_lines.begin(); p != past_lines.end(); ++p) if (layer.empty() || layer == p->first) output << p->first << ": " << with_newline(p->second); return output.str(); } string with_newline(string s) { if (s[s.size()-1] != '\n') return s+'\n'; return s; } }; trace_stream* Trace_stream = NULL; // Top-level helper. IMPORTANT: can't nest. #define trace(layer) !Trace_stream ? cerr /*print nothing*/ : Trace_stream->stream(layer) // Warnings should go straight to cerr by default since calls to trace() have // some unfriendly constraints (they delay printing, they can't nest) #define raise ((!Trace_stream || !Hide_warnings) ? cerr /*do print*/ : Trace_stream->stream("warn")) << __FILE__ << ":" << __LINE__ << " " // raise << die exits after printing -- unless Hide_warnings is set. struct die {}; ostream& operator<<(ostream& os, __attribute__((unused)) die) { if (Hide_warnings) return os; os << "dying\n"; exit(1); } #define CLEAR_TRACE delete Trace_stream, Trace_stream = new trace_stream; #define DUMP(layer) cerr << Trace_stream->readable_contents(layer) // Trace_stream is a resource, lease_tracer uses RAII to manage it. struct lease_tracer { lease_tracer() { Trace_stream = new trace_stream; } ~lease_tracer() { delete Trace_stream, Trace_stream = NULL; } }; #define START_TRACING_UNTIL_END_OF_SCOPE lease_tracer leased_tracer; bool check_trace_contents(string FUNCTION, string FILE, int LINE, string layer, string expected) { // empty layer == everything vector<string> expected_lines = split(expected, ""); size_t curr_expected_line = 0; while (curr_expected_line < expected_lines.size() && expected_lines[curr_expected_line].empty()) ++curr_expected_line; if (curr_expected_line == expected_lines.size()) return true; Trace_stream->newline(); ostringstream output; for (vector<pair<string, string> >::iterator p = Trace_stream->past_lines.begin(); p != Trace_stream->past_lines.end(); ++p) { if (!layer.empty() && layer != p->first) continue; if (p->second != expected_lines[curr_expected_line]) continue; ++curr_expected_line; while (curr_expected_line < expected_lines.size() && expected_lines[curr_expected_line].empty()) ++curr_expected_line; if (curr_expected_line == expected_lines.size()) return true; } ++Num_failures; cerr << "\nF " << FUNCTION << "(" << FILE << ":" << LINE << "): missing [" << expected_lines[curr_expected_line] << "] in trace:\n"; DUMP(layer); Passed = false; return false; } #define CHECK_TRACE_CONTENTS(...) check_trace_contents(__FUNCTION__, __FILE__, __LINE__, __VA_ARGS__) int trace_count(string layer, string line) { Trace_stream->newline(); long result = 0; for (vector<pair<string, string> >::iterator p = Trace_stream->past_lines.begin(); p != Trace_stream->past_lines.end(); ++p) { if (layer == p->first) if (line == "" || p->second == line) ++result; } return result; } #define CHECK_TRACE_WARNS() CHECK(trace_count("warn", "") > 0) #define CHECK_TRACE_DOESNT_WARN() \ if (trace_count("warn") > 0) { \ ++Num_failures; \ cerr << "\nF " << __FUNCTION__ << "(" << __FILE__ << ":" << __LINE__ << "): unexpected warnings\n"; \ DUMP("warn"); \ Passed = false; \ return; \ } bool trace_doesnt_contain(string layer, string line) { return trace_count(layer, line) == 0; } #define CHECK_TRACE_DOESNT_CONTAIN(...) CHECK(trace_doesnt_contain(__VA_ARGS__)) vector<string> split(string s, string delim) { vector<string> result; string::size_type begin=0, end=s.find(delim); while (true) { if (end == string::npos) { result.push_back(string(s, begin, string::npos)); break; } result.push_back(string(s, begin, end-begin)); begin = end+delim.size(); end = s.find(delim, begin); } return result; }


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