[SYCL] Disable RTTI for SYCL device compilation (#11411)

We do not support RTTI in kernel code. Do not emit type info during SYCL
device compilation.
This aligns SYCL with other offloading targets like CUDA.

Author: elizabethandrews

clang/lib/CodeGen/CodeGenModule.h

@@ -954,7 +954,8 @@ class CodeGenModule : public CodeGenTypeCache {
 
   // Return whether RTTI information should be emitted for this target.
   bool shouldEmitRTTI(bool ForEH = false) {
-    return (ForEH || getLangOpts().RTTI) && !getLangOpts().CUDAIsDevice &&
+    return (ForEH || getLangOpts().RTTI) && !getLangOpts().SYCLIsDevice &&
+           !getLangOpts().CUDAIsDevice &&
            !(getLangOpts().OpenMP && getLangOpts().OpenMPIsTargetDevice &&
              getTriple().isNVPTX());
   }

clang/test/CodeGenSYCL/simple-sycl-virtual-function.cpp

@@ -1,16 +1,10 @@
-// This test checks that the FE generates global variables corresponding to the
-// virtual table in the global address space (addrspace(1)) when
-// -fsycl-allow-virtual-functions is passed.
+// Test verifying that RTTI information is not emitted during SYCL device compilation.
 
-// RUN: %clang_cc1 -triple spir64 -fsycl-allow-virtual-functions -fsycl-is-device -emit-llvm %s -o - | FileCheck %s  --check-prefixes CHECK,CHECK-PTR
-// RUN: %clang_cc1 -triple spir64 -fsycl-allow-virtual-functions -fsycl-is-device -fexperimental-relative-c++-abi-vtables -emit-llvm %s -o - | FileCheck %s --check-prefixes CHECK,CHECK-REL
+// RUN: %clang_cc1 -triple spir64 -fsycl-allow-virtual-functions -fsycl-is-device -emit-llvm %s -o - | FileCheck %s --implicit-check-not _ZTI4Base --implicit-check-not _ZTI8Derived1 -check-prefix VTABLE
+// RUN: %clang_cc1 -triple spir64 -fsycl-allow-virtual-functions -fsycl-is-device -fexperimental-relative-c++-abi-vtables -emit-llvm %s -o - | FileCheck %s --implicit-check-not _ZTI4Base --implicit-check-not _ZTI8Derived1
 
-// CHECK: @_ZTVN10__cxxabiv120__si_class_type_infoE = external addrspace(1) global [0 x ptr addrspace(4)]
-// CHECK: @_ZTVN10__cxxabiv117__class_type_infoE = external addrspace(1) global [0 x ptr addrspace(4)]
-// CHECK-PTR: @_ZTI4Base = linkonce_odr constant { ptr addrspace(4), ptr } { ptr addrspace(4) getelementptr inbounds (ptr addrspace(4), ptr addrspace(4) addrspacecast (ptr addrspace(1) @_ZTVN10__cxxabiv117__class_type_infoE to ptr addrspace(4)), i64 2)
-// CHECK-PTR: @_ZTI8Derived1 = linkonce_odr constant { ptr addrspace(4), ptr, ptr } { ptr addrspace(4) getelementptr inbounds (ptr addrspace(4), ptr addrspace(4) addrspacecast (ptr addrspace(1) @_ZTVN10__cxxabiv120__si_class_type_infoE to ptr addrspace(4)), i64 2)
-// CHECK-REL: @_ZTI4Base = linkonce_odr constant { ptr addrspace(4), ptr } { ptr addrspace(4) getelementptr inbounds (i8, ptr addrspace(4) addrspacecast (ptr addrspace(1) @_ZTVN10__cxxabiv117__class_type_infoE to ptr addrspace(4)), i32 8)
-// CHECK-REL: @_ZTI8Derived1 = linkonce_odr constant { ptr addrspace(4), ptr, ptr } { ptr addrspace(4) getelementptr inbounds (i8, ptr addrspace(4) addrspacecast (ptr addrspace(1) @_ZTVN10__cxxabiv120__si_class_type_infoE to ptr addrspace(4)), i32 8)
+// VTABLE: @_ZTV8Derived1 = linkonce_odr unnamed_addr constant { [3 x ptr] } { [3 x ptr] [ptr null, ptr null, ptr @_ZN8Derived17displayEv] }, comdat, align 8
+// VTABLE: @_ZTV4Base = linkonce_odr unnamed_addr constant { [3 x ptr] } { [3 x ptr] [ptr null, ptr null, ptr @_ZN4Base7displayEv] }, comdat, align 8
 
 SYCL_EXTERNAL bool rand();