Add wide string literal

test/unicode.c

@@ -64,6 +64,19 @@ int main() {
 
   ASSERT(0, strcmp(STR(U"a"), "U\"a\""));
 
+  ASSERT(4, sizeof(L""));
+  ASSERT(20, sizeof(L"\xffzzz"));
+  ASSERT(0, memcmp(L"", "\0\0\0\0", 4));
+  ASSERT(0, memcmp(L"abc", "a\0\0\0b\0\0\0c\0\0\0\0\0\0\0", 16));
+  ASSERT(0, memcmp(L"日本語", "\345e\0\0,g\0\0\236\212\0\0\0\0\0\0", 16));
+  ASSERT(0, memcmp(L"🍣", "c\363\001\0\0\0\0\0", 8));
+  ASSERT(u'β', L"βb"[0]);
+  ASSERT(u'b', L"βb"[1]);
+  ASSERT(0, L"βb"[2]);
+  ASSERT(-1, L"\xffffffff"[0] >> 31);
+
+  ASSERT(0, strcmp(STR(L"a"), "L\"a\""));
+
   printf("OK\n");
   return 0;
 }

tokenize.c

@@ -544,6 +544,13 @@ Token *tokenize(File *file) {
       continue;
     }
 
+    // Wide string literal
+    if (startswith(p, "L\"")) {
+      cur = cur->next = read_utf32_string_literal(p, p + 1, ty_int);
+      p += cur->len;
+      continue;
+    }
+
     // UTF-32 string literal
     if (startswith(p, "U\"")) {
       cur = cur->next = read_utf32_string_literal(p, p + 1, ty_uint);