diff --git a/src/parser/parser.l b/src/parser/parser.l
index 068d828..526bc92 100644
--- a/src/parser/parser.l
+++ b/src/parser/parser.l
@@ -121,6 +121,7 @@ continue            return CONTINUE;
 
 sizeof              return SIZEOF;
 
+__attribute__       return ATTRIBUTE;
 
 L?'[^\\]'           return CHAR_CONST;
 L?'\\.'             return CHAR_CONST;
diff --git a/src/parser/parser.yc b/src/parser/parser.yc
index fde0fcb..1d9e9b5 100644
--- a/src/parser/parser.yc
+++ b/src/parser/parser.yc
@@ -112,6 +112,7 @@ int yylex(YYSTYPE *, YYLTYPE *);
 %token IDENTIFIER;
 
 %token TYPE_NAME;
+%token ATTRIBUTE;
 
 %start translation_unit
 
@@ -303,6 +304,14 @@ declaration_specifiers
         $$ = $2;
         $$->list->push_back($1);
     }
+    | attribute_spec {
+        $$ = new Node(NODE_TYPE_LIST);
+        $$->list->push_back($1);
+    }
+    | attribute_spec declaration_specifiers {
+        $$ = $2;
+        $$->list->push_back($1);
+    }
     ;
 
 init_declarator_list
@@ -404,8 +413,8 @@ type_qualifier
     ;
 
 declarator
-    : pointer direct_declarator { $$ = $2; }
-    | direct_declarator
+    : pointer direct_declarator opt_attribute_spec { $$ = $2; }
+    | direct_declarator opt_attribute_spec
     ;
 
 direct_declarator
@@ -558,10 +567,46 @@ external_declaration
     ;
 
 function_definition
-    : declaration_specifiers declarator declaration_list compound_statement
-    | declaration_specifiers declarator compound_statement
-    | declarator declaration_list compound_statement
-    | declarator compound_statement
+    : declaration_specifiers declarator declaration_list opt_attribute_spec compound_statement
+    | declaration_specifiers declarator opt_attribute_spec compound_statement
+    | declarator declaration_list opt_attribute_spec compound_statement
+    | declarator opt_attribute_spec compound_statement
+    ;
+
+opt_attribute_spec
+    : { $$ = nullptr; }
+    | attribute_spec
+    ;
+
+attribute_spec
+    : ATTRIBUTE LPAREN LPAREN attribute_list RPAREN RPAREN
+    ;
+
+attribute_list
+    : attribute {
+        $$ = new Node(NODE_TYPE_LIST);
+        $$->list->push_back($1);
+    }
+    | attribute_list COMMA attribute {
+        $$ = $1;
+        $$->list->push_back($3);
+    }
+    ;
+
+attribute
+    : IDENTIFIER
+    | IDENTIFIER LPAREN primary_expression_list RPAREN
+    ;
+
+primary_expression_list
+    : primary_expression {
+        $$ = new Node(NODE_TYPE_LIST);
+        $$->list->push_back($1);
+    }
+    | primary_expression_list COMMA primary_expression {
+        $$ = $1;
+        $$->list->push_back($3);
+    }
     ;
 
 %%