Don't emit the extra checksum into the .gcda file if the user hasn't asked for

it. Fortunately, versions of gcov that predate the extra checksum also ignore
any extra data, so this isn't a problem. There will be a matching commit in
compiler-rt.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176745 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Instrumentation/GCOVProfiling.cpp b/lib/Transforms/Instrumentation/GCOVProfiling.cpp
index db1dd41283080bdd14f4ab54a1ea3cdd9957ffee..c448caa15ab8d024ba90b47a304227ec729f5eb5 100644 (file)
--- a/lib/Transforms/Instrumentation/GCOVProfiling.cpp
+++ b/lib/Transforms/Instrumentation/GCOVProfiling.cpp
@@ -601,9 +601,10 @@ Constant *GCOVProfiler::getIncrementIndirectCounterFunc() {
 }
 
 Constant *GCOVProfiler::getEmitFunctionFunc() {
-  Type *Args[2] = {
+  Type *Args[3] = {
     Type::getInt32Ty(*Ctx),    // uint32_t ident
     Type::getInt8PtrTy(*Ctx),  // const char *function_name
+    Type::getInt8Ty(*Ctx),     // uint8_t use_extra_checksum
   };
   FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), Args, false);
   return M->getOrInsertFunction("llvm_gcda_emit_function", FTy);
@@ -668,12 +669,13 @@ void GCOVProfiler::insertCounterWriteout(
              I = CountersBySP.begin(), E = CountersBySP.end();
            I != E; ++I) {
         DISubprogram SP(I->second);
-        Builder.CreateCall2(EmitFunction,
+        Builder.CreateCall3(EmitFunction,
                             Builder.getInt32(i),
                             NoFunctionNamesInData ?
                               Constant::getNullValue(Builder.getInt8PtrTy()) :
-                              Builder.CreateGlobalStringPtr(SP.getName()));
-        
+                              Builder.CreateGlobalStringPtr(SP.getName()),
+                            Builder.getInt8(UseExtraChecksum));
+
         GlobalVariable *GV = I->first;
         unsigned Arcs =
           cast<ArrayType>(GV->getType()->getElementType())->getNumElements();