[clang] [clang][CodeGen] The `eh_typeid_for` intrinsic needs special care too (PR #65699)

[via cfe-commits]

llvmbot wrote:

@llvm/pr-subscribers-clang

<details>
<summary>Changes</summary>

This change is symmetric with the one reviewed in <https://reviews.llvm.org/D157452> and handles the exception handling specific intrinsic, which slipped through the cracks, in the same way, by inserting an address-space cast iff RTTI is in a non-default AS.
--
Full diff: https://github.com/llvm/llvm-project/pull/65699.diff

2 Files Affected:

- (modified) clang/lib/CodeGen/CGException.cpp (+4-1) 
- (added) clang/test/CodeGenCXX/try-catch-with-address-space.cpp (+25) 


<pre>
diff --git a/clang/lib/CodeGen/CGException.cpp b/clang/lib/CodeGen/CGException.cpp
index 3996f2948349cb5..49cf4ec4b84307b 100644
--- a/clang/lib/CodeGen/CGException.cpp
+++ b/clang/lib/CodeGen/CGException.cpp
@@ -1149,7 +1149,10 @@ static void emitCatchDispatchBlock(CodeGenFunction &CGF,
     assert(handler.Type.Flags == 0 &&
            "landingpads do not support catch handler flags");
     assert(typeValue && "fell into catch-all case!");
-    typeValue = CGF.Builder.CreateBitCast(typeValue, CGF.Int8PtrTy);
+    llvm::Type *argTy = llvm_eh_typeid_for->getArg(0)->getType();
+    // With opaque ptrs, only the address space can be a mismatch.
+    if (typeValue->getType() != argTy)
+      typeValue = CGF.Builder.CreateAddrSpaceCast(typeValue, argTy);
 
     // Figure out the next block.
     bool nextIsEnd;
diff --git a/clang/test/CodeGenCXX/try-catch-with-address-space.cpp b/clang/test/CodeGenCXX/try-catch-with-address-space.cpp
new file mode 100644
index 000000000000000..279d29f50fd4101
--- /dev/null
+++ b/clang/test/CodeGenCXX/try-catch-with-address-space.cpp
@@ -0,0 +1,25 @@
+// RUN: %clang_cc1 %s -triple=amdgcn-amd-amdhsa -emit-llvm -o - -fcxx-exceptions -fexceptions | FileCheck %s
+
+struct X { };
+
+const X g();
+
+void f() {
+  try {
+    throw g();
+    // CHECK: ptr addrspace(1) @_ZTI1X
+  } catch (const X x) {
+    // CHECK: catch ptr addrspace(1) @_ZTI1X
+    // CHECK: call i32 @llvm.eh.typeid.for(ptr addrspacecast (ptr addrspace(1) @_ZTI1X to ptr))
+  }
+}
+
+void h() {
+  try {
+    throw "ABC";
+    // CHECK: ptr addrspace(1) @_ZTIPKc
+  } catch (char const(&)[4]) {
+    // CHECK: catch ptr addrspace(1) @_ZTIA4_c
+    // CHECK: call i32 @llvm.eh.typeid.for(ptr addrspacecast (ptr addrspace(1) @_ZTIA4_c to ptr))
+  }
+}
</pre>

</details>

https://github.com/llvm/llvm-project/pull/65699