Add support for comdats with names larger than 256 characters.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226012 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Bitcode/Writer/BitcodeWriter.cpp

@@ -549,11 +549,13 @@ static unsigned getEncodedComdatSelectionKind(const Comdat &C) {
 }
 
 static void writeComdats(const ValueEnumerator &VE, BitstreamWriter &Stream) {
-  SmallVector<uint8_t, 64> Vals;
+  SmallVector<uint16_t, 64> Vals;
   for (const Comdat *C : VE.getComdats()) {
     // COMDAT: [selection_kind, name]
     Vals.push_back(getEncodedComdatSelectionKind(*C));
-    Vals.push_back(C->getName().size());
+    size_t Size = C->getName().size();
+    assert(isUInt<16>(Size));
+    Vals.push_back(Size);
     for (char Chr : C->getName())
       Vals.push_back((unsigned char)Chr);
     Stream.EmitRecord(bitc::MODULE_CODE_COMDAT, Vals, /*AbbrevToUse=*/0);

test/Assembler/large-comdat.ll

@@ -0,0 +1,9 @@
+; RUN: llvm-as < %s | llvm-dis | FileCheck %s
+
+$_ZSt9make_pairIN4llvm16DenseMapIteratorINS0_14PointerIntPairIPKNS0_5ValueELj1ENS0_21PointerLikeTypeTraitsIS5_EEEENS0_19NonLocalPointerInfoENS0_12DenseMapInfoIS8_EENS0_12DenseMapPairIS9_EEEEbESt4pairINSt17__decay_and_stripIT_E6__typeENSG_IT0_E6__typeEESH_SK_ = comdat any
+
+; CHECK: $_ZSt9make_pairIN4llvm16DenseMapIteratorINS0_14PointerIntPairIPKNS0_5ValueELj1ENS0_21PointerLikeTypeTraitsIS5_EEEENS0_19NonLocalPointerInfoENS0_12DenseMapInfoIS8_EENS0_12DenseMapPairIS9_EEEEbESt4pairINSt17__decay_and_stripIT_E6__typeENSG_IT0_E6__typeEESH_SK_ = comdat any
+
+define void @_ZSt9make_pairIN4llvm16DenseMapIteratorINS0_14PointerIntPairIPKNS0_5ValueELj1ENS0_21PointerLikeTypeTraitsIS5_EEEENS0_19NonLocalPointerInfoENS0_12DenseMapInfoIS8_EENS0_12DenseMapPairIS9_EEEEbESt4pairINSt17__decay_and_stripIT_E6__typeENSG_IT0_E6__typeEESH_SK_() comdat {
+  ret void
+}