Symbolizer::Symbolizer(ElfCacheBase* cache, Dwarf::LocationInfoMode mode)
: cache_(cache ? cache : defaultElfCache()), mode_(mode) {
}
Symbolizer::Symbolizer(ElfCacheBase* cache)
: cache_(cache ?: defaultElfCache()) {
}
void Symbolizer::symbolize(const uintptr_t* addresses,
SymbolizedFrame* frames,
size_t addressCount) {
size_t remaining = 0;
for (size_t i = 0; i < addressCount; ++i) {
auto& frame = frames[i];
if (!frame.found) {
++remaining;
frame.clear();
}
}
if (remaining == 0) { // we're done
return;
}
int fd = openNoInt("/proc/self/maps", O_RDONLY);
if (fd == -1) {
return;
}
char buf[PATH_MAX + 100]; // Long enough for any line
LineReader reader(fd, buf, sizeof(buf));
while (remaining != 0) {
StringPiece line;
if (reader.readLine(line) != LineReader::kReading) {
break;
}
// Parse line
uintptr_t from;
uintptr_t to;
StringPiece fileName;
if (!parseProcMapsLine(line, from, to, fileName)) {
continue;
}
bool first = true;
std::shared_ptr<ElfFile> elfFile;
// See if any addresses are here
for (size_t i = 0; i < addressCount; ++i) {
auto& frame = frames[i];
if (frame.found) {
continue;
}
uintptr_t address = addresses[i];
if (from > address || address >= to) {
continue;
}
// Found
frame.found = true;
--remaining;
// Open the file on first use
if (first) {
first = false;
elfFile = cache_->getFile(fileName);
}
if (!elfFile) {
continue;
}
// Undo relocation
frame.set(elfFile, address - from);
}
}
closeNoInt(fd);
}
