Add explicit EOF to top-level parser rule

* Fixes #1154 * Generally helps catch trailing syntax errors * Performance-neutral relative to previous grammar * Recommended by antlr4 devs, can help performance in some cases * See antlr/antlr4#1540
chipsalliance · Oct 29, 2019 · 39010b7 · 39010b7
1 parent 7b18778
commit 39010b7
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/main/antlr4/FIRRTL.g4 b/src/main/antlr4/FIRRTL.g4
@@ -29,7 +29,7 @@ import firrtl.LexerHelper;
 
 // Does there have to be at least one module?
 circuit
-  : 'circuit' id ':' info? INDENT module* DEDENT
+  : 'circuit' id ':' info? INDENT module* DEDENT EOF
   ;
 
 module