[PATCH] D95704: [CodeGen] Introduce DWARF tag for SwiftTail and emit it in CodeGen.

[Varun Gandhi via Phabricator via llvm-commits]

varungandhi-apple created this revision.
varungandhi-apple added a reviewer: aprantl.
varungandhi-apple requested review of this revision.
Herald added projects: clang, LLVM.
Herald added subscribers: llvm-commits, cfe-commits.

swifttailcc is a new calling convention in LLVM introduced
in https://reviews.llvm.org/D95443. We add a new DWARF tag to capture
this in debuginfo.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D95704

Files:
  clang/lib/CodeGen/CGDebugInfo.cpp
  clang/test/CodeGen/debug-info-cc.c
  llvm/include/llvm/BinaryFormat/Dwarf.def


Index: llvm/include/llvm/BinaryFormat/Dwarf.def
===================================================================
--- llvm/include/llvm/BinaryFormat/Dwarf.def
+++ llvm/include/llvm/BinaryFormat/Dwarf.def
@@ -788,6 +788,7 @@
 HANDLE_DW_CC(0xc9, LLVM_PreserveMost)
 HANDLE_DW_CC(0xca, LLVM_PreserveAll)
 HANDLE_DW_CC(0xcb, LLVM_X86RegCall)
+HANDLE_DW_CC(0xcc, LLVM_SwiftTail)
 // From GCC source code (include/dwarf2.h): This DW_CC_ value is not currently
 // generated by any toolchain.  It is used internally to GDB to indicate OpenCL C
 // functions that have been compiled with the IBM XL C for OpenCL compiler and use
Index: clang/test/CodeGen/debug-info-cc.c
===================================================================
--- clang/test/CodeGen/debug-info-cc.c
+++ clang/test/CodeGen/debug-info-cc.c
@@ -57,9 +57,8 @@
   return a+b;
 }
 
-// [FIXME: swiftasynccc] Update debuginfo tag to SwiftAsync once LLVM support lands.
 // LINUX: !DISubprogram({{.*}}"add_swiftasynccall", {{.*}}type: ![[FTY:[0-9]+]]
-// LINUX: ![[FTY]] = !DISubroutineType({{.*}}cc: DW_CC_LLVM_Swift,
+// LINUX: ![[FTY]] = !DISubroutineType({{.*}}cc: DW_CC_LLVM_SwiftTail,
 __attribute__((swiftasynccall)) int add_swiftasynccall(int a, int b) {
   return a+b;
 }
Index: clang/lib/CodeGen/CGDebugInfo.cpp
===================================================================
--- clang/lib/CodeGen/CGDebugInfo.cpp
+++ clang/lib/CodeGen/CGDebugInfo.cpp
@@ -1249,8 +1249,7 @@
   case CC_Swift:
     return llvm::dwarf::DW_CC_LLVM_Swift;
   case CC_SwiftAsync:
-    // [FIXME: swiftasynccc] Update to SwiftAsync once LLVM support lands.
-    return llvm::dwarf::DW_CC_LLVM_Swift;
+    return llvm::dwarf::DW_CC_LLVM_SwiftTail;
   case CC_PreserveMost:
     return llvm::dwarf::DW_CC_LLVM_PreserveMost;
   case CC_PreserveAll:


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