diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6dde5c6..6ea7d78 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,6 +2,6 @@ cmake_minimum_required(VERSION 3.10)
 project(asm-parser)
 
 set(CMAKE_CXX_STANDARD 17)
-add_compile_options(-Werror -Wall -Wextra)
+add_compile_options(-Werror -Wall -Wextra -O3 -flto)
 
 add_subdirectory(src)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a415a3c..1a4a593 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -2,4 +2,5 @@
 add_executable(asm-parser
     main.cpp
     types/state.cpp
+    utils/utils.cpp
     objdump/parser.cpp)
diff --git a/src/objdump/parser.cpp b/src/objdump/parser.cpp
index 13766e1..b7c856f 100644
--- a/src/objdump/parser.cpp
+++ b/src/objdump/parser.cpp
@@ -1,27 +1,12 @@
 #include "parser.hpp"
 #include "../types/line.hpp"
+#include "../utils/utils.hpp"
 
 #include <iostream>
 
 AsmParser::ObjDumpParser::ObjDumpParser() {
 }
 
-bool is_whitespace(const char c) {
-    return ((c == 32) || (c == 7));
-}
-
-bool is_hex(const char c) {
-    return (c >= 'a' && c <= 'f') || (c >= '0' && c <= '9');
-}
-
-int8_t hex2int(const char c) {
-    if (c >= '0' && c <= '9') {
-        return c - '0';
-    } else {
-        return 10 + (c - 'a');
-    }
-}
-
 void AsmParser::ObjDumpParser::eol() {
     this->state.currentLine.text = this->state.text;
     lines.push_back(this->state.currentLine);
@@ -31,6 +16,7 @@ void AsmParser::ObjDumpParser::eol() {
 
 void AsmParser::ObjDumpParser::label() {
     this->state.previousLabel = this->state.text;
+    labels.emplace(this->state.previousLabel, lines.size());
     this->state.text.clear();
 }
 
@@ -112,7 +98,7 @@ void AsmParser::ObjDumpParser::fromStream(std::istream &in) {
 }
 
 void AsmParser::ObjDumpParser::outputJson(std::ostream &out) {
-    out << "[";
+    out << "{[";
 
     for (auto line: this->lines) {
         out << "{\n";
@@ -134,7 +120,13 @@ void AsmParser::ObjDumpParser::outputJson(std::ostream &out) {
         out << "},\n";
     }
 
-    out << "]";
+    out << "],";
+
+    out << "\"labels\": [\n";
+    for (auto label: this->labels) {
+        out << "\"" << label.first << "\": " << label.second << ",\n";
+    }
+    out << "]}\n";
 }
 
 void AsmParser::ObjDumpParser::outputText(std::ostream &out) {
diff --git a/src/objdump/parser.hpp b/src/objdump/parser.hpp
index 06c07f9..72c2e61 100644
--- a/src/objdump/parser.hpp
+++ b/src/objdump/parser.hpp
@@ -3,6 +3,7 @@
 #include "../types/line.hpp"
 #include "../types/state.hpp"
 #include <istream>
+#include <unordered_map>
 
 namespace AsmParser {
 
@@ -10,6 +11,7 @@ class ObjDumpParser {
 private:
     ParserState state{};
     std::vector<asm_line> lines;
+    std::unordered_map<std::string, int32_t> labels;
 
     void eol();
     void address();
diff --git a/src/utils/utils.cpp b/src/utils/utils.cpp
new file mode 100644
index 0000000..4d7704b
--- /dev/null
+++ b/src/utils/utils.cpp
@@ -0,0 +1,17 @@
+#include "utils.hpp"
+
+bool AsmParser::is_whitespace(const char c) {
+    return ((c == 32) || (c == 7));
+}
+
+bool AsmParser::is_hex(const char c) {
+    return (c >= 'a' && c <= 'f') || (c >= '0' && c <= '9');
+}
+
+int8_t AsmParser::hex2int(const char c) {
+    if (c >= '0' && c <= '9') {
+        return c - '0';
+    } else {
+        return 10 + (c - 'a');
+    }
+}
diff --git a/src/utils/utils.hpp b/src/utils/utils.hpp
new file mode 100644
index 0000000..1af823e
--- /dev/null
+++ b/src/utils/utils.hpp
@@ -0,0 +1,10 @@
+
+#include <cstdint>
+
+namespace AsmParser {
+
+bool is_whitespace(const char c);
+bool is_hex(const char c);
+int8_t hex2int(const char c);
+
+}