[WebAssembly] Use the correct size for MCFillFragment

sbc100 · sbc100 · commit b03c2b4b0984 · 2017-07-10T18:36:34.000Z
Summary: When implementing MCFillFragment, use the size of the fragment, rather than the size of the section. Patch by Dan Gohman Differential Revision: https://reviews.llvm.org/D35090 llvm-svn: 307565
diff --git a/llvm/lib/MC/WasmObjectWriter.cpp b/llvm/lib/MC/WasmObjectWriter.cpp
@@ -1197,7 +1197,7 @@ void WasmObjectWriter::writeObject(MCAssembler &Asm,
                                                  Align->getMaxBytesToEmit());
           DataBytes.resize(Size, Value);
         } else if (auto *Fill = dyn_cast<MCFillFragment>(&Frag)) {
-          DataBytes.insert(DataBytes.end(), Size, Fill->getValue());
+          DataBytes.insert(DataBytes.end(), Fill->getSize(), Fill->getValue());
         } else {
           const auto &DataFrag = cast<MCDataFragment>(Frag);
           const SmallVectorImpl<char> &Contents = DataFrag.getContents();
diff --git a/llvm/test/MC/WebAssembly/array-fill.ll b/llvm/test/MC/WebAssembly/array-fill.ll
@@ -0,0 +1,14 @@
+; RUN: llc -filetype=obj %s -o - | obj2yaml | FileCheck %s
+; PR33624
+
+source_filename = "ws.c"
+target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
+target triple = "wasm32-unknown-unknown-wasm"
+
+%struct.bd = type { i8 }
+
+@gBd = hidden global [2 x %struct.bd] [%struct.bd { i8 1 }, %struct.bd { i8 2 }], align 1
+
+; CHECK:  - Type:            DATA
+; CHECK:        Content:         '0102'
+; CHECK:    DataSize:        2
