vala, codegen: Add o modifier to regex literal

Use compile flag `G_REGEX_OPTIMIZE` to make use of JIT optimization

codegen/valaccodebasemodule.vala

@@ -4494,6 +4494,9 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 		if (parts[1].contains ("x")) {
 			flags += " | G_REGEX_EXTENDED";
 		}
+		if (parts[1].contains ("o")) {
+			flags += " | G_REGEX_OPTIMIZE";
+		}
 
 		var cdecl = new CCodeDeclaration ("GRegex*");
 

tests/Makefile.am

@@ -963,8 +963,10 @@ TESTS = \
 	scanner/regex-escape-x-digit-length.test \
 	scanner/regex-escape-x-empty.test \
 	scanner/regex-escape-x.vala \
+	scanner/regex-modifier-o.vala \
 	scanner/regex-multiple-i.test \
 	scanner/regex-multiple-m.test \
+	scanner/regex-multiple-o.test \
 	scanner/regex-multiple-s.test \
 	scanner/regex-multiple-x.test \
 	scanner/string-escape-u-digit-length.test \

tests/scanner/regex-modifier-o.c-expected

@@ -0,0 +1,56 @@
+/* scanner_regex_modifier_o.c generated by valac, the Vala compiler
+ * generated from scanner_regex_modifier_o.vala, do not modify */
+
+#include <glib.h>
+
+#if !defined(VALA_STRICT_C)
+#if !defined(__clang__) && defined(__GNUC__) && (__GNUC__ >= 14)
+#pragma GCC diagnostic warning "-Wincompatible-pointer-types"
+#elif defined(__clang__) && (__clang_major__ >= 16)
+#pragma clang diagnostic ignored "-Wincompatible-function-pointer-types"
+#pragma clang diagnostic ignored "-Wincompatible-pointer-types"
+#endif
+#endif
+
+#define _g_regex_unref0(var) ((var == NULL) ? NULL : (var = (g_regex_unref (var), NULL)))
+
+static void _vala_main (void);
+
+static GRegex* _tmp_regex_0 = NULL;
+
+static inline GRegex*
+_thread_safe_regex_init (GRegex** re,
+                         const gchar * pattern,
+                         GRegexCompileFlags compile_flags)
+{
+	if (g_once_init_enter ((volatile gsize*) re)) {
+		GRegex* val = g_regex_new (pattern, compile_flags, 0, NULL);
+		g_once_init_leave ((volatile gsize*) re, (gsize) val);
+	}
+	return *re;
+}
+
+static gpointer
+_g_regex_ref0 (gpointer self)
+{
+	return self ? g_regex_ref (self) : NULL;
+}
+
+static void
+_vala_main (void)
+{
+	GRegex* foo = NULL;
+	GRegex* _tmp0_;
+	_tmp0_ = _g_regex_ref0 (_thread_safe_regex_init (&_tmp_regex_0, "foo(.*)", 0 | G_REGEX_OPTIMIZE));
+	foo = _tmp0_;
+	_g_regex_unref0 (foo);
+}
+
+int
+main (int argc,
+      char ** argv)
+{
+	_vala_main ();
+	return 0;
+}
+

tests/scanner/regex-modifier-o.vala

@@ -0,0 +1,3 @@
+void main () {
+	Regex foo = /foo(.*)/o;
+}

tests/scanner/regex-multiple-o.test

@@ -0,0 +1,5 @@
+Invalid Code
+
+void main () {
+	Regex foo = /foo(.*)/oo;
+}

vala/valascanner.vala

@@ -122,7 +122,8 @@ public class Vala.Scanner {
 				var fl_s = false;
 				var fl_m = false;
 				var fl_x = false;
-				while (current[0] == 'i' || current[0] == 's' || current[0] == 'm' || current[0] == 'x') {
+				var fl_o = false;
+				while (current[0] == 'i' || current[0] == 's' || current[0] == 'm' || current[0] == 'x' || current[0] == 'o') {
 					switch (current[0]) {
 					case 'i':
 						if (fl_i) {
@@ -148,6 +149,12 @@ public class Vala.Scanner {
 						}
 						fl_x = true;
 						break;
+					case 'o':
+						if (fl_o) {
+							Report.error (get_source_reference (token_length_in_chars), "modifier 'o' used more than once");
+						}
+						fl_o = true;
+						break;
 					}
 					current++;
 					token_length_in_chars++;