Restore r184205 and associated commits (after commit of r185290)
This allows clang to use the backend parameter attribute 'returned' when generating 'this'-returning constructors and destructors in ARM and MSVC C++ ABIs.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185291 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenModule.cpp b/lib/CodeGen/CodeGenModule.cpp
index efff4b1..3298d5a 100644
--- a/lib/CodeGen/CodeGenModule.cpp
+++ b/lib/CodeGen/CodeGenModule.cpp
@@ -722,6 +722,14 @@
if (!IsIncompleteFunction)
SetLLVMFunctionAttributes(FD, getTypes().arrangeGlobalDeclaration(GD), F);
+ if (getCXXABI().HasThisReturn(GD)) {
+ assert(!F->arg_empty() &&
+ F->arg_begin()->getType()
+ ->canLosslesslyBitCastTo(F->getReturnType()) &&
+ "unexpected this return");
+ F->addAttribute(1, llvm::Attribute::Returned);
+ }
+
// Only a few attributes are set on declarations; these may later be
// overridden by a definition.