Optimize wasm reading (#1202)

* optimize wasm reading: use a set of the breaks we've seen, don't rescan blocks to see if they have breaks to them

1 files changed, 1 insertions, 0 deletions

diff --git a/src/wasm-binary.h b/src/wasm-binary.h
index b7e614fa5..bf1cb14d6 100644
--- a/src/wasm-binary.h
+++ b/src/wasm-binary.h
@@ -863,6 +863,7 @@ public:
     BreakTarget(Name name, int arity) : name(name), arity(arity) {}
   };
   std::vector<BreakTarget> breakStack;
+  std::unordered_set<Name> breakTargetNames;
   bool breaksToReturn; // whether a break is done to the function scope, which is in effect a return
 
   std::vector<Expression*> expressionStack;