[Parser][NFC] Do less work when parsing function types (#6516)

After the initial parsing pass to find the locations of all the module elements
and after the type definitions have been parsed, the next phase of parsing is to
visit all of the module elements and parse their types. This phase does not
require parsing function bodies, but it previously parsed entire functions
anyway for simplicity. To improve performance, skip that useless work.

1 files changed, 5 insertions, 3 deletions

diff --git a/src/parser/parsers.h b/src/parser/parsers.h
index bbb50b664..25078f354 100644
--- a/src/parser/parsers.h
+++ b/src/parser/parsers.h
@@ -3028,11 +3028,13 @@ template<typename Ctx> MaybeResult<> func(Ctx& ctx) {
       CHECK_ERR(l);
       localVars = *l;
     }
-    CHECK_ERR(instrs(ctx));
-    ctx.setSrcLoc(ctx.in.takeAnnotations());
+    if (!ctx.skipFunctionBody()) {
+      CHECK_ERR(instrs(ctx));
+      ctx.setSrcLoc(ctx.in.takeAnnotations());
+    }
   }
 
-  if (!ctx.in.takeRParen()) {
+  if (!ctx.skipFunctionBody() && !ctx.in.takeRParen()) {
     return ctx.in.err("expected end of function");
   }