verilog: error on macro invocations with missing argument lists

This would previously complain about an undefined internal macro if the
unapplied macro had not already been used. If it had, it would
incorrectly use the arguments from the previous invocation.

1 files changed, 10 insertions, 1 deletions

diff --git a/frontends/verilog/preproc.cc b/frontends/verilog/preproc.cc
index c451c4c20..de707593f 100644
--- a/frontends/verilog/preproc.cc
+++ b/frontends/verilog/preproc.cc
@@ -477,7 +477,16 @@ static bool try_expand_macro(define_map_t &defines, std::string &tok)
 	std::string name = tok.substr(1);
 	std::string skipped_spaces = skip_spaces();
 	tok = next_token(false);
-	if (tok == "(" && body->has_args) {
+	if (body->has_args) {
+		if (tok != "(") {
+			if (tok.size() == 1 && iscntrl(tok[0])) {
+				char buf[5];
+				snprintf(buf, sizeof(buf), "\\x%02x", tok[0]);
+				tok = buf;
+			}
+			log_error("Expected to find '(' to begin macro arguments for '%s', but instead found '%s'\n",
+				name.c_str(), tok.c_str());
+		}
 		std::vector<std::string> args;
 		bool done = false;
 		while (!done) {