diff --git a/include/pocketpy/profiler.h b/include/pocketpy/profiler.h
index 7231c447..c76e4e43 100644
--- a/include/pocketpy/profiler.h
+++ b/include/pocketpy/profiler.h
@@ -6,15 +6,11 @@ namespace pkpy {
 
 struct LineRecord{
     int line;
-    SourceData* src;
-
     i64 hits;
     clock_t time;
 
-    LineRecord(): line(-1), src(nullptr), hits(0), time(0) {}
-
-    std::string_view line_content() const;
-    bool is_valid() const { return src != nullptr; }
+    LineRecord(): line(-1), hits(0), time(0) {}
+    bool is_valid() const { return line != -1; }
 };
 
 struct LineProfiler{
@@ -25,6 +21,8 @@ struct LineProfiler{
     // filename -> records
     std::map<std::string_view, std::vector<LineRecord>> records;
 
+    std::set<FuncDecl*> functions;
+
     void begin();
     void _step(Frame* frame);
     void _step_end();
diff --git a/src/modules.cpp b/src/modules.cpp
index 194b8434..acb08f17 100644
--- a/src/modules.cpp
+++ b/src/modules.cpp
@@ -262,7 +262,10 @@ struct LineProfilerW{
         vm->bind_default_constructor<LineProfilerW>(type);
 
         vm->bind(type, "add_function(self, func)", [](VM* vm, ArgsView args){
-            // ...
+            LineProfilerW& self = PK_OBJ_GET(LineProfilerW, args[0]);
+            vm->check_non_tagged_type(args[1], VM::tp_function);
+            auto decl = PK_OBJ_GET(Function, args[1]).decl.get();
+            self.profiler.functions.insert(decl);
             return vm->None;
         });
 
diff --git a/src/profiler.cpp b/src/profiler.cpp
index 569ee7a1..9eb48e6e 100644
--- a/src/profiler.cpp
+++ b/src/profiler.cpp
@@ -14,11 +14,6 @@ static std::string to_string_1f(f64 x){
     return buf;
 }
 
-std::string_view LineRecord::line_content() const {
-    auto [_0, _1] = src->_get_line(line);
-    return std::string_view(_0, _1-_0);
-}
-
 void LineProfiler::begin(){
     prev_time = 0;
     prev_record = nullptr;
@@ -43,7 +38,6 @@ void LineProfiler::_step(Frame *frame){
         file_records.resize(total_lines + 1);
         for(int i=1; i<=total_lines; i++){
             file_records[i].line = i;
-            file_records[i].src = frame->co->src.get();
         }
     }
     prev_record = &file_records.at(line);
@@ -66,25 +60,33 @@ void LineProfiler::end(){
 
 Str LineProfiler::stats(){
     SStream ss;
-    for(auto& [filename, file_records] : records){
+    for(FuncDecl* decl: functions){
+        int start_line = decl->code->start_line;
+        int end_line = decl->code->end_line;
+        if(start_line == -1 || end_line == -1) continue;
+        std::string_view filename = decl->code->src->filename.sv();
+        std::vector<LineRecord>& file_records = records[filename];
+        if(file_records.empty()) continue;
         clock_t total_time = 0;
-        for(auto& record: file_records){
-            if(record.is_valid()) total_time += record.time;
+        for(int line = start_line; line <= end_line; line++){
+            total_time += file_records.at(line).time;
         }
         ss << "Total time: " << (f64)total_time / CLOCKS_PER_SEC << "s\n";
         ss << "File: " << filename << "\n";
-        // ss << "Function: " << "<?>" << "at line " << -1 << "\n";
+        ss << "Function: " << decl->code->name << " at line " << start_line << "\n";
         ss << "Line #      Hits         Time  Per Hit   % Time  Line Contents\n";
         ss << "==============================================================\n";
-        for(int line = 1; line < file_records.size(); line++){
-            LineRecord& record = file_records[line];
-            if(!record.is_valid() || record.hits == 0) continue;
+        for(int line = start_line; line <= end_line; line++){
+            const LineRecord& record = file_records.at(line);
+            if(!record.is_valid()) continue;
             ss << left_pad(std::to_string(line), 6);
             ss << left_pad(std::to_string(record.hits), 10);
-            ss << left_pad(std::to_string(record.time), 13);
+            ss << left_pad(std::to_string(record.time / CLOCKS_PER_SEC), 13);
             ss << left_pad(std::to_string(record.time / record.hits), 9);
             ss << left_pad(to_string_1f(record.time * (f64)100 / total_time), 9);
-            ss << "  " << record.line_content() << "\n";
+            // line_content
+            auto [_0, _1] = decl->code->src->_get_line(line);
+            ss << "  " << std::string_view(_0, _1-_0) << "\n";
         }
         ss << "\n";
     }