Introducing try_get_string_by_idx interface for retrieving literal string value by it's identifier.

src/libcoreint/interpreter.h

@@ -16,8 +16,9 @@
 #ifndef INTERPRETER_H
 #define	INTERPRETER_H
 
-#include "opcodes.h"
 #include "ecma-globals.h"
+#include "globals.h"
+#include "opcodes.h"
 
 OPCODE __program[128];
 
@@ -35,5 +36,7 @@ void init_int (void);
 void run_int (void);
 void run_int_from_pos (struct __int_data *);
 
+ssize_t try_get_string_by_idx( T_IDX idx, ecma_Char_t *buffer_p, ssize_t buffer_size);
+
 #endif	/* INTERPRETER_H */