resolve constants fully, through both multiple aliases and bitcasts

1 files changed, 17 insertions, 3 deletions

diff --git a/lib/Target/JSBackend/JSBackend.cpp b/lib/Target/JSBackend/JSBackend.cpp
index ec33d4cd83..d4fbdad1ee 100644
--- a/lib/Target/JSBackend/JSBackend.cpp
+++ b/lib/Target/JSBackend/JSBackend.cpp
@@ -310,12 +310,26 @@ namespace {
       return getBlockAddress(BA->getFunction(), BA->getBasicBlock());
     }
 
+    const Value *resolveFully(const Value *V) {
+      bool More = true;
+      while (More) {
+        More = false;
+        if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(V)) {
+          V = GA->getAliasee();
+          More = true;
+        }
+        if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
+          V = CE->getOperand(0); // ignore bitcasts
+          More = true;
+        }
+      }
+      return V;
+    }
+
     // Return a constant we are about to write into a global as a numeric offset. If the
     // value is not known at compile time, emit a postSet to that location.
     unsigned getConstAsOffset(const Value *V, unsigned AbsoluteTarget) {
-      if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(V)) {
-        V = GA->getAliasee();
-      }
+      V = resolveFully(V);
       if (const Function *F = dyn_cast<const Function>(V)) {
         return getFunctionIndex(F);
       } else if (const BlockAddress *BA = dyn_cast<const BlockAddress>(V)) {