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//:: Some helpers for debugging.
//: Load the 'map' file generated during 'subx --debug translate' when running
//: 'subx --debug --trace run'.
//: (It'll only affect the trace.)
:(before "End Globals")
map</*address*/uint32_t, string> Symbol_name; // used only by 'subx run'
map</*address*/uint32_t, string> Source_line; // used only by 'subx run'
:(before "End --debug Settings")
load_labels();
load_source_lines();
:(code)
void load_labels() {
ifstream fin("labels");
fin >> std::hex;
while (has_data(fin)) {
uint32_t addr = 0;
fin >> addr;
string name;
fin >> name;
put(Symbol_name, addr, name);
}
}
void load_source_lines() {
ifstream fin("source_lines");
fin >> std::hex;
while (has_data(fin)) {
uint32_t addr = 0;
fin >> addr;
string line;
getline(fin, line);
put(Source_line, addr, hacky_squeeze_out_whitespace(line));
}
}
:(after "Run One Instruction")
if (contains_key(Symbol_name, EIP))
trace(Callstack_depth, "run") << "== label " << get(Symbol_name, EIP) << end();
if (contains_key(Source_line, EIP))
trace(Callstack_depth, "run") << "0x" << HEXWORD << EIP << ": " << get(Source_line, EIP) << end();
else
// no source line info; do what you can
trace(Callstack_depth, "run") << "0x" << HEXWORD << EIP << ": " << debug_info(EIP) << end();
:(code)
string debug_info(uint32_t inst_address) {
uint8_t op = read_mem_u8(inst_address);
if (op != 0xe8) {
ostringstream out;
out << HEXBYTE << NUM(op);
return out.str();
}
int32_t offset = read_mem_i32(inst_address+/*skip op*/1);
uint32_t next_eip = inst_address+/*inst length*/5+offset;
if (contains_key(Symbol_name, next_eip))
return "e8/call "+get(Symbol_name, next_eip);
ostringstream out;
out << "e8/call 0x" << HEXWORD << next_eip;
return out.str();
}
//: If a label starts with '$watch-', make a note of the effective address
//: computed by the next instruction. Start dumping out its contents to the
//: trace after every subsequent instruction.
:(after "Run One Instruction")
dump_watch_points();
:(before "End Globals")
map<string, uint32_t> Watch_points;
:(before "End Reset")
Watch_points.clear();
:(code)
void dump_watch_points() {
if (Watch_points.empty()) return;
trace(Callstack_depth, "dbg") << "watch points:" << end();
for (map<string, uint32_t>::iterator p = Watch_points.begin(); p != Watch_points.end(); ++p)
trace(Callstack_depth, "dbg") << " " << p->first << ": " << HEXWORD << p->second << " -> " << HEXWORD << read_mem_u32(p->second) << end();
}
:(before "End Globals")
string Watch_this_effective_address;
:(after "Run One Instruction")
Watch_this_effective_address = "";
if (contains_key(Symbol_name, EIP) && starts_with(get(Symbol_name, EIP), "$watch-"))
Watch_this_effective_address = get(Symbol_name, EIP);
:(after "Found effective_address(addr)")
if (!Watch_this_effective_address.empty()) {
dbg << "now watching " << HEXWORD << addr << " for " << Watch_this_effective_address << end();
put(Watch_points, Watch_this_effective_address, addr);
}
//: Special label that dumps regions of memory.
//: Not a general mechanism; by the time you get here you're willing to hack
//: on the emulator.
:(after "Run One Instruction")
if (contains_key(Symbol_name, EIP) && get(Symbol_name, EIP) == "$dump-stream-at-EAX")
dump_stream_at(Reg[EAX].u);
:(code)
void dump_stream_at(uint32_t stream_start) {
int32_t stream_length = read_mem_i32(stream_start + 8);
dbg << "stream length: " << std::dec << stream_length << end();
for (int i = 0; i < stream_length + 12; ++i)
dbg << "0x" << HEXWORD << (stream_start+i) << ": " << HEXBYTE << NUM(read_mem_u8(stream_start+i)) << end();
}
//: helpers
:(code)
string hacky_squeeze_out_whitespace(const string& s) {
// strip whitespace at start
string::const_iterator first = s.begin();
while (first != s.end() && isspace(*first))
++first;
if (first == s.end()) return "";
// strip whitespace at end
string::const_iterator last = --s.end();
while (last != s.begin() && isspace(*last))
--last;
++last;
// replace runs of spaces/dots with single space until comment or string
// TODO:
// leave alone dots not surrounded by whitespace
// leave alone '#' within word
// leave alone '"' within word
// squeeze spaces after end of string
ostringstream out;
bool previous_was_space = false;
bool in_comment_or_string = false;
for (string::const_iterator curr = first; curr != last; ++curr) {
if (in_comment_or_string)
out << *curr;
else if (isspace(*curr) || *curr == '.')
previous_was_space = true;
else {
if (previous_was_space)
out << ' ';
out << *curr;
previous_was_space = false;
if (*curr == '#' || *curr == '"') in_comment_or_string = true;
}
}
return out.str();
}
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