diff --git a/tools/aidl/AST.h b/tools/aidl/AST.h
index ead5e7ae3439c..d7bfccb7a6ce4 100644
--- a/tools/aidl/AST.h
+++ b/tools/aidl/AST.h
@@ -1,5 +1,5 @@
-#ifndef AIDL_AST_H
-#define AIDL_AST_H
+#ifndef AIDL_AST_H_
+#define AIDL_AST_H_
 
 #include <string>
 #include <vector>
@@ -368,4 +368,4 @@ struct Document
     virtual void Write(FILE* to);
 };
 
-#endif // AIDL_AST_H
+#endif // AIDL_AST_H_
diff --git a/tools/aidl/Android.mk b/tools/aidl/Android.mk
index 9554e4291d416..1f32f21b80d41 100644
--- a/tools/aidl/Android.mk
+++ b/tools/aidl/Android.mk
@@ -20,17 +20,18 @@ LOCAL_CFLAGS += -Wno-deprecated-register
 LOCAL_CFLAGS += -Wno-writable-strings
 
 LOCAL_SRC_FILES := \
-	aidl_language_l.l \
-	aidl_language_y.y \
-	aidl.cpp \
-	aidl_language.cpp \
-	options.cpp \
-	search_path.cpp \
-	AST.cpp \
-	Type.cpp \
-	generate_java.cpp \
-	generate_java_binder.cpp \
-	generate_java_rpc.cpp
+    AST.cpp \
+    Type.cpp \
+    aidl.cpp \
+    aidl_language.cpp \
+    aidl_language_l.l \
+    aidl_language_y.y \
+    generate_java.cpp \
+    generate_java_binder.cpp \
+    generate_java_rpc.cpp \
+    main.cpp \
+    options.cpp \
+    search_path.cpp \
 
 LOCAL_MODULE := aidl
 
diff --git a/tools/aidl/Type.h b/tools/aidl/Type.h
index ae12720142e88..d799fca1b7529 100644
--- a/tools/aidl/Type.h
+++ b/tools/aidl/Type.h
@@ -1,5 +1,5 @@
-#ifndef AIDL_TYPE_H
-#define AIDL_TYPE_H
+#ifndef AIDL_TYPE_H_
+#define AIDL_TYPE_H_
 
 #include "AST.h"
 #include <string>
@@ -539,4 +539,4 @@ extern Expression* FALSE_VALUE;
 
 void register_base_types();
 
-#endif // AIDL_TYPE_H
+#endif // AIDL_TYPE_H_
diff --git a/tools/aidl/aidl.cpp b/tools/aidl/aidl.cpp
index 991c5b8497d76..a4ecb758046e9 100644
--- a/tools/aidl/aidl.cpp
+++ b/tools/aidl/aidl.cpp
@@ -933,7 +933,7 @@ check_and_assign_method_ids(const char * filename, interface_item_type* first_it
 }
 
 // ==========================================================
-static int
+int
 compile_aidl(Options& options)
 {
     int err = 0, N;
@@ -1063,7 +1063,7 @@ compile_aidl(Options& options)
     return err;
 }
 
-static int
+int
 preprocess_aidl(const Options& options)
 {
     vector<string> lines;
@@ -1135,24 +1135,3 @@ preprocess_aidl(const Options& options)
     close(fd);
     return 0;
 }
-
-// ==========================================================
-int
-main(int argc, const char **argv)
-{
-    Options options;
-    int result = parse_options(argc, argv, &options);
-    if (result) {
-        return result;
-    }
-
-    switch (options.task)
-    {
-        case COMPILE_AIDL:
-            return compile_aidl(options);
-        case PREPROCESS_AIDL:
-            return preprocess_aidl(options);
-    }
-    fprintf(stderr, "aidl: internal error\n");
-    return 1;
-}
diff --git a/tools/aidl/aidl.h b/tools/aidl/aidl.h
new file mode 100644
index 0000000000000..98b15f36c21af
--- /dev/null
+++ b/tools/aidl/aidl.h
@@ -0,0 +1,9 @@
+#ifndef AIDL_AIDL_H_
+#define AIDL_AIDL_H_
+
+#include "options.h"
+
+int compile_aidl(Options& options);
+int preprocess_aidl(const Options& options);
+
+#endif  // AIDL_AIDL_H_
diff --git a/tools/aidl/aidl_language.h b/tools/aidl/aidl_language.h
index de1370c086f53..1be5a9bbeb6d1 100644
--- a/tools/aidl/aidl_language.h
+++ b/tools/aidl/aidl_language.h
@@ -1,5 +1,5 @@
-#ifndef DEVICE_TOOLS_AIDL_AIDL_LANGUAGE_H
-#define DEVICE_TOOLS_AIDL_AIDL_LANGUAGE_H
+#ifndef AIDL_AIDL_LANGUAGE_H_
+#define AIDL_AIDL_LANGUAGE_H_
 
 
 typedef enum {
@@ -169,4 +169,4 @@ void init_buffer_type(buffer_type* buf, int lineno);
 #endif
 
 
-#endif // DEVICE_TOOLS_AIDL_AIDL_LANGUAGE_H
+#endif // AIDL_AIDL_LANGUAGE_H_
diff --git a/tools/aidl/generate_java.h b/tools/aidl/generate_java.h
index 4bfcfeba07c86..ae7983fcffe75 100644
--- a/tools/aidl/generate_java.h
+++ b/tools/aidl/generate_java.h
@@ -1,5 +1,5 @@
-#ifndef GENERATE_JAVA_H
-#define GENERATE_JAVA_H
+#ifndef AIDL_GENERATE_JAVA_H_
+#define AIDL_GENERATE_JAVA_H_
 
 #include "aidl_language.h"
 #include "AST.h"
@@ -29,5 +29,5 @@ private:
     int m_index;
 };
 
-#endif // GENERATE_JAVA_H
+#endif // AIDL_GENERATE_JAVA_H_
 
diff --git a/tools/aidl/main.cpp b/tools/aidl/main.cpp
new file mode 100644
index 0000000000000..7cc2198bb5dfb
--- /dev/null
+++ b/tools/aidl/main.cpp
@@ -0,0 +1,23 @@
+#include "aidl.h"
+#include "options.h"
+
+#include <stdio.h>
+
+int
+main(int argc, const char **argv)
+{
+    Options options;
+    int result = parse_options(argc, argv, &options);
+    if (result) {
+        return result;
+    }
+
+    switch (options.task) {
+        case COMPILE_AIDL:
+            return compile_aidl(options);
+        case PREPROCESS_AIDL:
+            return preprocess_aidl(options);
+    }
+    fprintf(stderr, "aidl: internal error\n");
+    return 1;
+}
diff --git a/tools/aidl/options.h b/tools/aidl/options.h
index 387e37d087322..6a7d6a704859d 100644
--- a/tools/aidl/options.h
+++ b/tools/aidl/options.h
@@ -1,5 +1,5 @@
-#ifndef DEVICE_TOOLS_AIDL_H
-#define DEVICE_TOOLS_AIDL_H
+#ifndef AIDL_OPTIONS_H_
+#define AIDL_OPTIONS_H_
 
 #include <string.h>
 #include <string>
@@ -33,4 +33,4 @@ struct Options
 // It also prints the usage statement on failure.
 int parse_options(int argc, const char* const* argv, Options *options);
 
-#endif // DEVICE_TOOLS_AIDL_H
+#endif // AIDL_OPTIONS_H_
diff --git a/tools/aidl/os.h b/tools/aidl/os.h
index 79d2c35eea3d2..752ed4777b0c6 100644
--- a/tools/aidl/os.h
+++ b/tools/aidl/os.h
@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-#ifndef _FRAMEWORKS_BASE_TOOLS_AIDL_OS_SEP_H_
-#define _FRAMEWORKS_BASE_TOOLS_AIDL_OS_SEP_H_
+#ifndef AIDL_OS_H_
+#define AIDL_OS_H_
 
 #if defined(_WIN32)
 #define OS_PATH_SEPARATOR '\\'
@@ -23,4 +23,4 @@
 #define OS_PATH_SEPARATOR '/'
 #endif
 
-#endif
+#endif  // AIDL_OS_H_
diff --git a/tools/aidl/search_path.h b/tools/aidl/search_path.h
index 2bf94b12bbf10..4fec257557de4 100644
--- a/tools/aidl/search_path.h
+++ b/tools/aidl/search_path.h
@@ -1,5 +1,5 @@
-#ifndef DEVICE_TOOLS_AIDL_SEARCH_PATH_H
-#define DEVICE_TOOLS_AIDL_SEARCH_PATH_H
+#ifndef AIDL_SEARCH_PATH_H_
+#define AIDL_SEARCH_PATH_H_
 
 #include <stdio.h>
 
@@ -19,5 +19,4 @@ char* find_import_file(const char* given);
 void set_import_paths(const vector<string>& importPaths);
 #endif
 
-#endif // DEVICE_TOOLS_AIDL_SEARCH_PATH_H
-
+#endif // AIDL_SEARCH_PATH_H_