[SYCL] Error out instead of crash when templated global var used

clang/lib/Sema/Sema.cpp

@@ -1679,6 +1679,15 @@ class DeferredDiagnosticsEmitter
   }
 
   void visitUsedDecl(SourceLocation Loc, Decl *D) {
+    if (S.LangOpts.SYCLIsDevice && ShouldEmitRootNode) {
+      if (auto *VD = dyn_cast<VarDecl>(D)) {
+        if (!S.checkAllowedSYCLInitializer(VD)) {
+          S.Diag(Loc, diag::err_sycl_restrict)
+              << Sema::KernelConstStaticVariable;
+          return;
+        }
+      }
+    }
     if (isa<VarDecl>(D))
       return;
     if (auto *FD = dyn_cast<FunctionDecl>(D)) {

clang/lib/Sema/SemaDecl.cpp

@@ -18725,16 +18725,14 @@ Sema::FunctionEmissionStatus Sema::getEmissionStatus(FunctionDecl *FD,
                                                      bool Final) {
   assert(FD && "Expected non-null FunctionDecl");
 
-  // SYCL functions can be template, so we check if they have appropriate
-  // attribute prior to checking if it is a template.
-  if (LangOpts.SYCLIsDevice &&
-      (FD->hasAttr<SYCLDeviceAttr>() || FD->hasAttr<SYCLKernelAttr>()))
-    return FunctionEmissionStatus::Emitted;
-
   // Templates are emitted when they're instantiated.
   if (FD->isDependentContext())
     return FunctionEmissionStatus::TemplateDiscarded;
 
+  if (LangOpts.SYCLIsDevice &&
+      (FD->hasAttr<SYCLDeviceAttr>() || FD->hasAttr<SYCLKernelAttr>()))
+    return FunctionEmissionStatus::Emitted;
+
   // Check whether this function is an externally visible definition.
   auto IsEmittedForExternalSymbol = [this, FD]() {
     // We have to check the GVA linkage of the function's *definition* -- if we

clang/lib/Sema/SemaExpr.cpp

@@ -246,12 +246,6 @@ bool Sema::DiagnoseUseOfDecl(NamedDecl *D, ArrayRef<SourceLocation> Locs,
         SYCLDiagIfDeviceCode(*Locs.begin(),
                              diag::err_esimd_global_in_sycl_context,
                              Sema::DeviceDiagnosticReason::Sycl);
-      // Disallow const statics and globals that are not zero-initialized
-      // or constant-initialized.
-      else if (IsRuntimeEvaluated && IsConst && VD->hasGlobalStorage() &&
-               !VD->isConstexpr() && !checkAllowedSYCLInitializer(VD))
-        SYCLDiagIfDeviceCode(*Locs.begin(), diag::err_sycl_restrict)
-            << Sema::KernelConstStaticVariable;
     } else if (auto *FDecl = dyn_cast<FunctionDecl>(D)) {
       // SYCL device function cannot be called from an ESIMD context. However,
       // funcitons that start with '__spirv_' or '__sycl_' are exceptions to

clang/lib/Sema/SemaSYCL.cpp

@@ -4111,11 +4111,6 @@ void Sema::finalizeSYCLDelayedAnalysis(const FunctionDecl *Caller,
                                        const FunctionDecl *Callee,
                                        SourceLocation Loc,
                                        DeviceDiagnosticReason Reason) {
-  // Somehow an unspecialized template appears to be in callgraph or list of
-  // device functions. We don't want to emit diagnostic here.
-  if (Callee->getTemplatedKind() == FunctionDecl::TK_FunctionTemplate)
-    return;
-
   Callee = Callee->getMostRecentDecl();
 
   // If the reason for the emission of this diagnostic is not SYCL-specific,

clang/lib/Sema/SemaTemplateInstantiateDecl.cpp

@@ -5678,10 +5678,6 @@ void Sema::InstantiateVariableInitializer(
 
   if (getLangOpts().CUDA)
     checkAllowedCUDAInitializer(Var);
-
-  if (getLangOpts().SYCLIsDevice && !checkAllowedSYCLInitializer(Var))
-    SYCLDiagIfDeviceCode(Var->getLocation(), diag::err_sycl_restrict)
-        << Sema::KernelConstStaticVariable;
 }
 
 /// Instantiate the definition of the given variable from its

clang/test/SemaSYCL/inline-asm.cpp

@@ -22,7 +22,7 @@ static __inline unsigned int
 asm_func_2(unsigned int __leaf, unsigned long __d[]) {
   unsigned int __result;
 #ifdef SPIR_CHECK
-  //expected-error@+2 2{{invalid output constraint '=a' in asm}}
+  // expected-error@+2 {{invalid output constraint '=a' in asm}}
   __asm__("enclu"
           : "=a"(__result), "=b"(__d[0]), "=c"(__d[1]), "=d"(__d[2])
           : "a"(__leaf), "b"(__d[0]), "c"(__d[1]), "d"(__d[2])
@@ -58,7 +58,7 @@ __attribute__((sycl_kernel)) void kernel_single_task(const Func &kernelFunc) {
 #ifdef SPIR_CHECK
   unsigned int i = 3;
   unsigned long d[4];
-  //expected-note@+1 2{{called by 'kernel_single_task}}
+  // expected-note@+1 {{called by 'kernel_single_task}}
   asm_func_2(i, d);
 #endif // SPIR_CHECK
 #else

clang/test/SemaSYCL/sycl-device-const-static.cpp

@@ -22,6 +22,16 @@ template struct U<Base>;
 
 const S s5;
 
+template <typename T>
+class randomType {
+public:
+  randomType() {}
+  T val;
+};
+
+template <typename T>
+const randomType<T> Var;
+
 void usage() {
   // expected-error@+1{{SYCL kernel cannot use a non-const static data variable}}
   static int s1;
@@ -34,11 +44,13 @@ void usage() {
   (void)s5;
   // expected-error@+1{{SYCL kernel cannot use a const static or global variable that is neither zero-initialized nor constant-initialized}}
   (void)s6;
+
+  // expected-error@+1{{SYCL kernel cannot use a const static or global variable that is neither zero-initialized nor constant-initialized}}
+  (void)Var<int>;
 }
 
 template <typename Name, typename Func>
 __attribute__((sycl_kernel)) void kernel_single_task(const Func &kernelFunc) {
-  // expected-error@+1{{SYCL kernel cannot use a non-const static data variable}}
   static int z;
   // expected-note-re@+3{{called by 'kernel_single_task<fake_kernel, (lambda at {{.*}})>}}
   // expected-note-re@+2{{called by 'kernel_single_task<fake_kernel, (lambda at {{.*}})>}}