From d707c37072195e1e05edd8765b3f4bd79955b154 Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Tue, 9 Jan 2018 22:48:37 +0000
Subject: Use a MCExpr for the size of MCFillFragment.

This allows the size to be found during ralaxation. This fixes
pr35858.

llvm-svn: 322131
---
 llvm/lib/MC/WasmObjectWriter.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'llvm/lib/MC/WasmObjectWriter.cpp')

diff --git a/llvm/lib/MC/WasmObjectWriter.cpp b/llvm/lib/MC/WasmObjectWriter.cpp
index 782479e2651..37b12c63be4 100644
--- a/llvm/lib/MC/WasmObjectWriter.cpp
+++ b/llvm/lib/MC/WasmObjectWriter.cpp
@@ -528,7 +528,10 @@ static void addData(SmallVectorImpl<char> &DataBytes,
                                              Align->getMaxBytesToEmit());
       DataBytes.resize(Size, Value);
     } else if (auto *Fill = dyn_cast<MCFillFragment>(&Frag)) {
-      DataBytes.insert(DataBytes.end(), Fill->getSize(), Fill->getValue());
+      int64_t Size;
+      if (!Fill->getSize().evaluateAsAbsolute(Size))
+        llvm_unreachable("The fill should be an assembler constant");
+      DataBytes.insert(DataBytes.end(), Size, Fill->getValue());
     } else {
       const auto &DataFrag = cast<MCDataFragment>(Frag);
       const SmallVectorImpl<char> &Contents = DataFrag.getContents();
-- 
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