[PATCH] D94735: CGDebugInfo: Drop unneeded line number for FlagFwdDecl declarations

[Fangrui Song via Phabricator via cfe-commits]

MaskRay created this revision.
MaskRay added reviewers: debug-info, aprantl, dblaikie.
Herald added a subscriber: pengfei.
MaskRay requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

Tested with stage 2 -DCMAKE_BUILD_TYPE=Debug clang, the only difference of .debug_info appears to be:
DW_AT_decl_line for the Clang synthesized `__va_list_tag` is now dropped.

Depends on D94391 <https://reviews.llvm.org/D94391>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D94735

Files:
  clang/lib/CodeGen/CGDebugInfo.cpp
  clang/test/CodeGen/X86/x86_64-arguments.c


Index: clang/test/CodeGen/X86/x86_64-arguments.c
===================================================================
--- clang/test/CodeGen/X86/x86_64-arguments.c
+++ clang/test/CodeGen/X86/x86_64-arguments.c
@@ -1,8 +1,8 @@
-// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s | \
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -debug-info-kind=limited -o - %s | \
 // RUN:   FileCheck %s -check-prefix=CHECK -check-prefix=SSE -check-prefix=NO-AVX512
-// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s -target-feature +avx | \
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -debug-info-kind=limited -o - %s -target-feature +avx | \
 // RUN:   FileCheck %s -check-prefix=CHECK -check-prefix=AVX -check-prefix=NO-AVX512
-// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s -target-feature +avx512f | \
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -debug-info-kind=limited -o - %s -target-feature +avx512f | \
 // RUN:   FileCheck %s -check-prefix=CHECK -check-prefix=AVX -check-prefix=AVX512
 #include <stdarg.h>
 
@@ -545,3 +545,6 @@
 // AVX: @f65(<8 x float> %{{[^,)]+}})
 void f65(struct t65 a0) {
 }
+
+/// The synthesized __va_list_tag does not have the line field.
+// CHECK: = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "__va_list_tag", file: ![[#FILE:]], size:
Index: clang/lib/CodeGen/CGDebugInfo.cpp
===================================================================
--- clang/lib/CodeGen/CGDebugInfo.cpp
+++ clang/lib/CodeGen/CGDebugInfo.cpp
@@ -3336,8 +3336,7 @@
 
   // Get overall information about the record type for the debug info.
   llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
-  const unsigned Line =
-      getLineNumber(RD->getLocation().isValid() ? RD->getLocation() : CurLoc);
+  const unsigned Line = getLineNumber(RD->getLocation());
   StringRef RDName = getClassName(RD);
 
   llvm::DIScope *RDContext = getDeclContextDescriptor(RD);


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