From 0dab8853d60e2e61a749b93056faae35e7ec6ce6 Mon Sep 17 00:00:00 2001
From: Alon Zakai <azakai@google.com>
Date: Mon, 6 Jan 2020 16:01:38 -0800
Subject: DCE at the end of wasm2js (#2574)

By doing so we ensure that our calls to convert wasm
types to JS types never try to convert an unreachable.

Fixes #2558
---
 src/wasm2js.h | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src')

diff --git a/src/wasm2js.h b/src/wasm2js.h
index 1adde23b8..398b81f43 100644
--- a/src/wasm2js.h
+++ b/src/wasm2js.h
@@ -329,6 +329,9 @@ Ref Wasm2JSBuilder::processWasm(Module* wasm, Name funcName) {
     runner.add("reorder-locals");
     runner.add("vacuum");
     runner.add("remove-unused-module-elements");
+    // DCE at the end to make sure all IR nodes have valid types for conversion
+    // to JS, and not unreachable.
+    runner.add("dce");
     runner.setDebug(flags.debug);
     runner.run();
   }
-- 
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