Change Metadata Index emission in the bitcode to use 2x32 bits for the placeholder

The Bitstream reader and writer are limited to handle a "size_t" at
most, which means that we can't backpatch and read back a 64bits
value on 32 bits platform.

llvm-svn: 290693

1 files changed, 6 insertions, 1 deletions

diff --git a/llvm/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp b/llvm/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
index 3220063275b..f97a18448f0 100644
--- a/llvm/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
+++ b/llvm/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
@@ -609,7 +609,12 @@ static bool ParseBlock(BitstreamCursor &Stream, BitstreamBlockInfo &BlockInfo,
       // and validate its forward reference offset was correct!
       if (BlockID == bitc::METADATA_BLOCK_ID) {
         if (Code == bitc::METADATA_INDEX_OFFSET) {
-          MetadataIndexOffset = Stream.GetCurrentBitNo() + Record[0];
+          if (Record.size() != 2)
+            outs() << "(Invalid record)";
+          else {
+            auto Offset = Record[0] + (Record[1] << 32);
+            MetadataIndexOffset = Stream.GetCurrentBitNo() + Offset;
+          }
         }
         if (Code == bitc::METADATA_INDEX) {
           outs() << " (offset ";