42 using namespace std::string_literals;
79     std::string arch_visibility_str;  in calculateRequiredGuard()
84         arch_visibility_str += std::to_string(arch_visibility[arch]);  in calculateRequiredGuard()
112 static std::deque<std::string> readFileLines(const std::string& path) {  in readFileLines()
113   std::ifstream is(path.c_str());  in readFileLines()
114   std::deque<std::string> result;  in readFileLines()
115   std::string line;  in readFileLines()
117   while (std::getline(is, line)) {  in readFileLines()
118     result.push_back(std::move(line));  in readFileLines()
124 static void writeFileLines(const std::string& path, const std::deque<std::string>& lines) {  in writeFileLines()
129   std::ofstream os(path.c_str(), std::ios_base::out | std::ios_base::trunc);  in writeFileLines()
131   for (const std::string& line : lines) {  in writeFileLines()
136 using GuardMap = std::map<Location, DeclarationAvailability>;
138 static std::string generateGuardCondition(const DeclarationAvailability& avail) {  in generateGuardCondition()
140   std::vector<std::string> expressions;  in generateGuardCondition()
141   static const std::vector<std::pair<std::string, std::set<Arch>>> arch_sets = {  in generateGuardCondition()
146   std::map<Arch, std::string> individual_archs = {  in generateGuardCondition()
153   auto generate_guard = [](const std::string& arch_expr, int min_version) {  in generateGuardCondition()
157     return arch_expr + " && __ANDROID_API__ >= " + std::to_string(min_version);  in generateGuardCondition()
179     return "__ANDROID_API__ >= "s + std::to_string(avail.global_availability.introduced);  in generateGuardCondition()
183     const std::string& arch_expr = it.first;  in generateGuardCondition()
184     const std::set<Arch>& archs = it.second;  in generateGuardCondition()
222     const std::string& arch_expr = it.second;  in generateGuardCondition()
241 static FileLocation findNextSemicolon(const std::deque<std::string>& lines, FileLocation start) {  in findNextSemicolon()
247     if (result != std::string::npos) {  in findNextSemicolon()
264 static void mergeGuards(std::deque<std::string>& file_lines, GuardMap& guard_map) {  in mergeGuards()
304       const std::string& line = file_lines[current_location.line - 1];  in mergeGuards()
309         if (pos == std::string::npos) {  in mergeGuards()
322         if (pos == std::string::npos) {  in mergeGuards()
377     std::tie(current, unused) = guard_map.insert(std::make_pair(merged, avail));  in mergeGuards()
383 static void rewriteFile(const std::string& output_path, std::deque<std::string>& file_lines,  in rewriteFile()
389     std::string condition = generateGuardCondition(avail);  in rewriteFile()
394     std::string prologue = "\n#if "s + condition + "\n";  in rewriteFile()
395     std::string epilogue = "\n#endif /* " + condition + " */\n";  in rewriteFile()
407 bool preprocessHeaders(const std::string& dst_dir, const std::string& src_dir,  in preprocessHeaders()
409   std::unordered_map<std::string, GuardMap> guards;  in preprocessHeaders()
410   std::unordered_map<std::string, std::deque<std::string>> file_lines;  in preprocessHeaders()
433   std::unique_ptr<FTS, decltype(&fts_close)> fts(fts_open(fts_paths, FTS_LOGICAL, nullptr),  in preprocessHeaders()
449     std::string rel_path = path.substr(src_dir.length() + 1).str();  in preprocessHeaders()
450     std::string dst_path = dst_dir + "/" + rel_path;  in preprocessHeaders()
488     std::string output_path = (llvm::Twine(dst_dir) + rel_path).str();  in preprocessHeaders()