llvm-cov: Split entry blocks in GCNOProfiling.cpp.

gcov expects every function to contain an entry block that
unconditionally branches into the next block. clang does not implement
basic blocks in this manner, so gcov did not output correct branch info
if the entry block branched to multiple blocks.

This change splits every function's entry block into an empty block and
a block with the rest of the instructions. The instrumentation code will
take care of the rest.

llvm-svn: 195513

1 files changed, 3 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp b/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
index 13472f038d5..fb5bee2ede2 100644
--- a/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
+++ b/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
@@ -467,6 +467,9 @@ void GCOVProfiler::emitProfileNotes() {
 
       Function *F = SP.getFunction();
       if (!F) continue;
+      BasicBlock &EntryBlock = F->getEntryBlock();
+      EntryBlock.splitBasicBlock(EntryBlock.begin());
+
       GCOVFunction *Func =
         new GCOVFunction(SP, &out, i, Options.UseCfgChecksum);
       Funcs.push_back(Func);