[PATCH] D136807: [clang][Sema] Fix a clang crash with btf_type_tag

[Yonghong Song via Phabricator via cfe-commits]

yonghong-song updated this revision to Diff 471216.
yonghong-song added a comment.

- Add the bug fix description in Release Note
- Actually compare debuginfo btf_type_tag output instead of marking 'expected-no-diagnostics'.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D136807/new/

https://reviews.llvm.org/D136807

Files:
  clang/docs/ReleaseNotes.rst
  clang/lib/Sema/SemaType.cpp
  clang/test/CodeGen/attr-btf_type_tag-func-ptr.c


Index: clang/test/CodeGen/attr-btf_type_tag-func-ptr.c
===================================================================
--- /dev/null
+++ clang/test/CodeGen/attr-btf_type_tag-func-ptr.c
@@ -0,0 +1,15 @@
+// RUN: %clang_cc1 -triple %itanium_abi_triple -debug-info-kind=limited -S -emit-llvm -o - %s | FileCheck %s
+
+struct t {
+ int (__attribute__((btf_type_tag("rcu"))) *f)();
+ int a;
+};
+int foo(struct t *arg) {
+  return arg->a;
+}
+
+// CHECK:      !DIDerivedType(tag: DW_TAG_member, name: "f"
+// CHECK-SAME: baseType: ![[L18:[0-9]+]]
+// CHECK:      ![[L18]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: ![[#]], size: [[#]], annotations: ![[L21:[0-9]+]])
+// CHECK:      ![[L21]] = !{![[L22:[0-9]+]]}
+// CHECK:      ![[L22]] = !{!"btf_type_tag", !"rcu"}
Index: clang/lib/Sema/SemaType.cpp
===================================================================
--- clang/lib/Sema/SemaType.cpp
+++ clang/lib/Sema/SemaType.cpp
@@ -6515,6 +6515,9 @@
       CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
     }
 
+    while (BTFTagAttributedTypeLoc TL = CurrTL.getAs<BTFTagAttributedTypeLoc>())
+      CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
+
     while (DependentAddressSpaceTypeLoc TL =
                CurrTL.getAs<DependentAddressSpaceTypeLoc>()) {
       fillDependentAddressSpaceTypeLoc(TL, D.getTypeObject(i).getAttrs());
Index: clang/docs/ReleaseNotes.rst
===================================================================
--- clang/docs/ReleaseNotes.rst
+++ clang/docs/ReleaseNotes.rst
@@ -258,6 +258,8 @@
 - Fix template arguments of pointer and reference not taking the type as
   part of their identity.
   `Issue 47136 <https://github.com/llvm/llvm-project/issues/47136>`_
+- Fix a crash when btf_type_tag attr is applied to the pointee of
+  a function pointer.
 
 Improvements to Clang's diagnostics
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^


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