1 //:: Some helpers for debugging.
  2 
  3 //: Load the 'map' file generated during 'bootstrap --debug translate' when running
  4 //: 'bootstrap --trace run'.
  5 //: (It'll only affect the trace.)
  6 
  7 :(before "End Globals")
  8 map</*address*/uint32_t, string> Symbol_name;  // used only by 'bootstrap run'
  9 map</*address*/uint32_t, string> Source_line;  // used only by 'bootstrap run'
 10 :(before "End --trace Settings")
 11 load_labels();
 12 load_source_lines();
 13 :(code)
 14 void load_labels() {
 15   ifstream fin("labels");
 16   if (fin.fail()) return;
 17   fin >> std::hex;
 18   while (has_data(fin)) {
 19     uint32_t addr = 0;
 20     fin >> addr;
 21     string name;
 22     fin >> name;
 23     put(Symbol_name, addr, name);
 24   }
 25 }
 26 
 27 void load_source_lines() {
 28   ifstream fin("source_lines");
 29   if (fin.fail()) return;
 30   fin >> std::hex;
 31   while (has_data(fin)) {
 32     uint32_t addr = 0;
 33     fin >> addr;
 34     string line;
 35     getline(fin, line);
 36     put(Source_line, addr, hacky_squeeze_out_whitespace(line));
 37   }
 38 }
 39 
 40 :(after "Run One Instruction")
 41 if (contains_key(Symbol_name, EIP))
 42   trace(Callstack_depth, "run") << "== label " << get(Symbol_name, EIP) << end();
 43 if (contains_key(Source_line, EIP))
 44   trace(Callstack_depth, "run") << "inst: " << get(Source_line, EIP) << end();
 45 else
 46   // no source line info; do what you can
 47   trace(Callstack_depth, "run") << "inst: " << debug_info(EIP) << end();
 48 
 49 :(code)
 50 string debug_info(uint32_t inst_address) {
 51   uint8_t op = read_mem_u8(inst_address);
 52   if (op != 0xe8) {
 53     ostringstream out;
 54     out << HEXBYTE << NUM(op);
 55     return out.str();
 56   }
 57   int32_t offset = read_mem_i32(inst_address+/*skip op*/1);
 58   uint32_t next_eip = inst_address+/*inst length*/5+offset;
 59   if (contains_key(Symbol_name, next_eip))
 60     return "e8/call "+get(Symbol_name, next_eip);
 61   ostringstream out;
 62   out << "e8/call 0x" << HEXWORD << next_eip;
 63   return out.str();
 64 }
 65 
 66 //: If a label starts with '$watch-', make a note of the effective address
 67 //: computed by the next instruction. Start dumping out its contents to the
 68 //: trace after every subsequent instruction.
 69 
 70 :(after "Run One Instruction")
 71 dump_watch_points();
 72 :(before "End Globals")
 73 map<string, uint32_t> Watch_points;
 74 :(before "End Reset")
 75 Watch_points.clear();
 76 :(code)
 77 void dump_watch_points() {
 78   if (Watch_points.empty()) return;
 79   trace(Callstack_depth, "dbg") << "watch points:" << end();
 80   for (map<string, uint32_t>::iterator p = Watch_points.begin();  p != Watch_points.end();  ++p)
 81     trace(Callstack_depth, "dbg") << "  " << p->first << ": " << HEXWORD << p->second << " -> " << HEXWORD << read_mem_u32(p->