Generate constant variables reference to user defined types

Currently, there is no code generated for following ASN.1 excerpt.
Thus application is not aware of these values.

    ProtocolIE-ID ::= INTEGER (0..65535)

    id-MME-UE-S1AP-ID  ProtocolIE-ID ::= 0
    id-HandoverType    ProtocolIE-ID ::= 1
    id-Cause           ProtocolIE-ID ::= 2
    id-SourceID        ProtocolIE-ID ::= 3
      ...

    ProcedureCode ::= INTEGER (0..255)

    id-HandoverPreparation         ProcedureCode ::= 0
    id-HandoverResourceAllocation  ProcedureCode ::= 1
    id-HandoverNotification        ProcedureCode ::= 2
    id-PathSwitchRequest           ProcedureCode ::= 3
    ...

This commit adds corresponding macro definitions in
ProtocolIE-ID.h and ProcedureCode.h respectively.

    #define ProtocolIE_ID_id_MME_UE_S1AP_ID       ((ProtocolIE_ID_t)0)
    #define ProtocolIE_ID_id_HandoverType ((ProtocolIE_ID_t)1)
    #define ProtocolIE_ID_id_Cause        ((ProtocolIE_ID_t)2)
    #define ProtocolIE_ID_id_SourceID     ((ProtocolIE_ID_t)3)
    ...

    #define ProcedureCode_id_HandoverPreparation ((ProcedureCode_t)0)
    #define ProcedureCode_id_HandoverResourceAllocation    ((ProcedureCode_t)1)
    #define ProcedureCode_id_HandoverNotification ((ProcedureCode_t)2)
    #define ProcedureCode_id_PathSwitchRequest    ((ProcedureCode_t)3)
    ...

Only types of ASN_BASIC_INTEGER and ASN_BASIC_ENUMERATED referenced
by these constant variables are handled.

Other built-in types shall be added in the future.

libasn1compiler/asn1c_C.c

@@ -1213,6 +1213,40 @@ asn1c_lang_C_type_CHOICE_def(arg_t *arg) {
 	return 0;
 } /* _CHOICE_def() */
 
+int
+asn1c_lang_C_type_REFERENCE_Value(arg_t *arg) {
+	arg_t tmp = *arg;
+	asn1p_expr_t *expr, *ref_type;
+	int saved_target;
+
+	expr = arg->expr;
+	ref_type = WITH_MODULE_NAMESPACE(
+			tmp.expr->module, expr_ns,
+			asn1f_lookup_symbol_ex(tmp.asn, expr_ns, tmp.expr,
+			arg->expr->reference));
+	if(!ref_type)
+		return 0;
+
+	if(!ref_type->data)
+		asn1c_attach_streams(ref_type);
+
+	arg->target = ref_type->data;
+	saved_target = arg->target->target;
+	REDIR(OT_FUNC_DECLS);
+
+	if((ref_type->expr_type == ASN_BASIC_INTEGER) ||
+		(ref_type->expr_type == ASN_BASIC_ENUMERATED)) {
+		OUT("#define %s_", MKID(ref_type));
+		OUT("%s\t", MKID(expr));
+		OUT("((%s)", asn1c_type_name(arg, expr, TNF_CTYPE));
+		OUT("%s)\n", asn1p_itoa(expr->value->value.v_integer));
+	}
+
+	REDIR(saved_target);
+	arg->target = tmp.target;
+	return 0;
+}
+
 int
 asn1c_lang_C_type_REFERENCE(arg_t *arg) {
 	asn1p_ref_t *ref;

libasn1compiler/asn1c_C.h

@@ -15,8 +15,11 @@ int asn1c_lang_C_type_common_INTEGER(arg_t *);
 int asn1c_lang_C_type_BIT_STRING(arg_t *);
 int asn1c_lang_C_type_REAL(arg_t *);
 int asn1c_lang_C_type_SIMPLE_TYPE(arg_t *);
+int asn1c_lang_C_type_REFERENCE_Value(arg_t *);
 
 static asn1_language_map_t asn1_lang_C[] __attribute__ ((unused)) = {
+	{ AMT_VALUE, A1TC_REFERENCE,	asn1c_lang_C_type_REFERENCE_Value },
+
 	{ AMT_TYPE, A1TC_REFERENCE,	asn1c_lang_C_type_REFERENCE },
 	{ AMT_TYPEREF, A1TC_REFERENCE,	asn1c_lang_C_type_REFERENCE },
 	{ AMT_TYPE, A1TC_EXTENSIBLE,	asn1c_lang_C_type_EXTENSIBLE },

libasn1compiler/asn1c_save.c

@@ -73,7 +73,8 @@ asn1c__save_library_makefile(arg_t *arg, const asn1c_dep_chainset *deps,
 	TQ_FOR(mod, &(arg->asn->modules), mod_next) {
 		TQ_FOR(arg->expr, &(mod->members), next) {
 			if(asn1_lang_map[arg->expr->meta_type]
-				[arg->expr->expr_type].type_cb) {
+				[arg->expr->expr_type].type_cb &&
+				(arg->expr->meta_type != AMT_VALUE)) {
 				safe_fprintf(mkf, "\t\\\n\t%s%s.c", destdir,
 				asn1c_make_identifier(AMI_MASK_ONLY_SPACES, arg->expr, 0));
 			}
@@ -83,7 +84,8 @@ asn1c__save_library_makefile(arg_t *arg, const asn1c_dep_chainset *deps,
 	TQ_FOR(mod, &(arg->asn->modules), mod_next) {
 		TQ_FOR(arg->expr, &(mod->members), next) {
 			if(asn1_lang_map[arg->expr->meta_type]
-				[arg->expr->expr_type].type_cb) {
+				[arg->expr->expr_type].type_cb &&
+				(arg->expr->meta_type != AMT_VALUE)) {
                 safe_fprintf(
                     mkf, "\t\\\n\t%s%s.h", destdir,
                     asn1c_make_identifier(AMI_MASK_ONLY_SPACES, arg->expr, 0));
@@ -395,7 +397,8 @@ asn1c_save_compiled_output(arg_t *arg, const char *datadir, const char *destdir,
         TQ_FOR(mod, &(arg->asn->modules), mod_next) {
             TQ_FOR(arg->expr, &(mod->members), next) {
                 if(asn1_lang_map[arg->expr->meta_type][arg->expr->expr_type]
-                       .type_cb) {
+                       .type_cb &&
+                   (arg->expr->meta_type != AMT_VALUE)) {
                     ret = asn1c_dump_streams(arg, deps, destdir, optc, argv);
                     if(ret) break;
                 }
@@ -927,7 +930,8 @@ pdu_collection_has_unused_types(arg_t *arg) {
 
 static enum include_type_result
 include_type_to_pdu_collection(arg_t *arg) {
-    if(!asn1_lang_map[arg->expr->meta_type][arg->expr->expr_type].type_cb)
+    if(!asn1_lang_map[arg->expr->meta_type][arg->expr->expr_type].type_cb ||
+        (arg->expr->meta_type == AMT_VALUE))
         return 0;
 
     /* Parameterized types can't serve as PDU's without instantiation. */
@@ -952,6 +956,7 @@ static abuf *
 generate_constant_collection(arg_t *arg) {
     asn1p_module_t *mod;
     abuf *buf = abuf_new();
+    int empty_file = 1;
 
     abuf_printf(buf, "/*\n * Generated by asn1c-" VERSION
                      " (http://lionet.info/asn1c)\n */\n\n");
@@ -968,28 +973,41 @@ generate_constant_collection(arg_t *arg) {
                 abuf_printf(buf, "#define %s (%s)\n",
                             asn1c_make_identifier(0, arg->expr, 0),
                             asn1p_itoa(arg->expr->value->value.v_integer));
+                empty_file = 0;
             }
         }
     }
 
     abuf_printf(buf, "\n\n#ifdef __cplusplus\n}\n#endif\n\n#endif /* _ASN_CONSTANT_H */\n");
+
+    if(empty_file) {
+        abuf_free(buf);
+        return 0;
+    }
     return buf;
 }
 
 static int
 generate_constant_file(arg_t *arg, const char *destdir) {
     abuf *buf = generate_constant_collection(arg);
-    assert(buf);
 
-    FILE *fp = asn1c_open_file(destdir, "asn_constant", ".h", 0);
-    if(fp == NULL) {
-        perror("asn_constant.h");
-        return -1;
-    }
-    safe_fwrite(buf->buffer, buf->length, 1, fp);
-    fclose(fp);
-    abuf_free(buf);
+    if(!buf) return 0;
+
+    if(arg->flags & A1C_PRINT_COMPILED) {
+        printf("\n/*** <<< asn_constant.h >>> ***/\n\n");
+        safe_fwrite(buf->buffer, buf->length, 1, stdout);
+    } else {
 
+        FILE *fp = asn1c_open_file(destdir, "asn_constant", ".h", 0);
+        if(fp == NULL) {
+            perror("asn_constant.h");
+            return -1;
+        }
+        safe_fwrite(buf->buffer, buf->length, 1, fp);
+        fclose(fp);
+    }
     safe_fprintf(stderr, "Generated asn_constant.h\n");
+
+    abuf_free(buf);
     return 0;
 }

libasn1compiler/asn1compiler.c

@@ -7,7 +7,6 @@
 
 static void default_logger_cb(int, const char *fmt, ...);
 static int asn1c_compile_expr(arg_t *arg, const asn1c_ioc_table_and_objset_t *);
-static int asn1c_attach_streams(asn1p_expr_t *expr);
 static int asn1c_detach_streams(asn1p_expr_t *expr);
 
 int
@@ -169,7 +168,7 @@ asn1c_compile_expr(arg_t *arg, const asn1c_ioc_table_and_objset_t *opt_ioc) {
 	return ret;
 }
 
-static int
+int
 asn1c_attach_streams(asn1p_expr_t *expr) {
 	compiler_streams_t *cs;
 	int i;

libasn1compiler/asn1compiler.h

@@ -110,4 +110,6 @@ void asn1c_debug_type_naming(asn1p_t *asn, enum asn1c_flags,
 
 void asn1c__add_pdu_type(const char *typename);
 
+int asn1c_attach_streams(asn1p_expr_t *expr);
+
 #endif	/* ASN1_COMPILER_H */