Optimize out memory and table when possible (#1352)

We can remove the memory/table (itself, or an import if imported) if they are not used. This is pretty minor on a large wasm file, but when reading small wasts it's very noticeable to have an unused memory and table all the time.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/passes/Print.cpp b/src/passes/Print.cpp
index cfdfc09dd..7651414e0 100644
--- a/src/passes/Print.cpp
+++ b/src/passes/Print.cpp
@@ -735,6 +735,7 @@ struct PrintSExpression : public Visitor<PrintSExpression> {
     o << " anyfunc)";
   }
   void visitTable(Table *curr) {
+    if (!curr->exists) return;
     // if table wasn't imported, declare it
     if (!curr->imported) {
       doIndent(o, indent);
@@ -764,6 +765,7 @@ struct PrintSExpression : public Visitor<PrintSExpression> {
     o << ")";
   }
   void visitMemory(Memory* curr) {
+    if (!curr->exists) return;
     // if memory wasn't imported, declare it
     if (!curr->imported) {
       doIndent(o, indent);