[HIP][Clang][CodeGen] Handle hip bin symbols properly. (llvm#107458)

Remove '_' in fatbin and gpubin symbol suffixes when missing TU hash ID.
Internalize gpubin symbol so that it is not unresolved at link-time when
symbol is not relocatable.

Change-Id: Ide44c894eea086e66f67826a08d79151157273d7

Author: jofrn

clang/lib/CodeGen/CGCUDANV.cpp

@@ -775,8 +775,10 @@ llvm::Function *CGNVCUDARuntime::makeModuleCtorFunction() {
       FatBinStr = new llvm::GlobalVariable(
           CGM.getModule(), CGM.Int8Ty,
           /*isConstant=*/true, llvm::GlobalValue::ExternalLinkage, nullptr,
-          "__hip_fatbin_" + CGM.getContext().getCUIDHash(), nullptr,
-          llvm::GlobalVariable::NotThreadLocal);
+          "__hip_fatbin" + (CGM.getLangOpts().CUID.empty()
+                                ? ""
+                                : "_" + CGM.getContext().getCUIDHash()),
+          nullptr, llvm::GlobalVariable::NotThreadLocal);
       cast<llvm::GlobalVariable>(FatBinStr)->setSection(FatbinConstantName);
     }
 
@@ -829,8 +831,8 @@ llvm::Function *CGNVCUDARuntime::makeModuleCtorFunction() {
   // thread safety of the loaded program. Therefore we can assume sequential
   // execution of constructor functions here.
   if (IsHIP) {
-    auto Linkage = CudaGpuBinary ? llvm::GlobalValue::InternalLinkage
-                                 : llvm::GlobalValue::ExternalLinkage;
+    auto Linkage = RelocatableDeviceCode ? llvm::GlobalValue::ExternalLinkage
+                                         : llvm::GlobalValue::InternalLinkage;
     llvm::BasicBlock *IfBlock =
         llvm::BasicBlock::Create(Context, "if", ModuleCtorFunc);
     llvm::BasicBlock *ExitBlock =
@@ -840,10 +842,11 @@ llvm::Function *CGNVCUDARuntime::makeModuleCtorFunction() {
     GpuBinaryHandle = new llvm::GlobalVariable(
         TheModule, PtrTy, /*isConstant=*/false, Linkage,
         /*Initializer=*/
-        CudaGpuBinary ? llvm::ConstantPointerNull::get(PtrTy) : nullptr,
-        CudaGpuBinary
-            ? "__hip_gpubin_handle"
-            : "__hip_gpubin_handle_" + CGM.getContext().getCUIDHash());
+        !RelocatableDeviceCode ? llvm::ConstantPointerNull::get(PtrTy)
+                               : nullptr,
+        "__hip_gpubin_handle" + (CGM.getLangOpts().CUID.empty()
+                                     ? ""
+                                     : "_" + CGM.getContext().getCUIDHash()));
     GpuBinaryHandle->setAlignment(CGM.getPointerAlign().getAsAlign());
     // Prevent the weak symbol in different shared libraries being merged.
     if (Linkage != llvm::GlobalValue::InternalLinkage)

clang/test/CodeGenCUDA/device-stub.cu

@@ -175,7 +175,7 @@ __device__ void device_use() {
 // HIP-SAME: section ".hipFatBinSegment"
 // * variable to save GPU binary handle after initialization
 // CUDANORDC: @__[[PREFIX]]_gpubin_handle = internal global ptr null
-// HIPNEF: @__[[PREFIX]]_gpubin_handle_{{[0-9a-f]+}} = external hidden global ptr, align 8
+// HIPNEF: @__[[PREFIX]]_gpubin_handle_{{[0-9a-f]+}} = internal global ptr null, align 8
 // * constant unnamed string with NVModuleID
 // CUDARDC: [[MODULE_ID_GLOBAL:@.*]] = private constant
 // CUDARDC-SAME: c"[[MODULE_ID:.+]]\00", section "__nv_module_id", align 32