CodeGen: Fix address space of indirect function argument

The indirect function argument is in alloca address space in LLVM IR. However,
during Clang codegen for C++, the address space of indirect function argument
should match its address space in the source code, i.e., default addr space, even
for indirect argument. This is because destructor of the indirect argument may
be called in the caller function, and address of the indirect argument may be
taken, in either case the indirect function argument is expected to be in default
addr space, not the alloca address space.

Therefore, the indirect function argument should be mapped to the temp var
casted to default address space. The caller will cast it to alloca addr space
when passing it to the callee. In the callee, the argument is also casted to the
default address space and used.

CallArg is refactored to facilitate this fix.

Differential Revision: https://reviews.llvm.org/D34367

llvm-svn: 326946

1 files changed, 2 insertions, 2 deletions

diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index 19deb9b..fa65b1d 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -3899,10 +3899,10 @@ private:
   void ExpandTypeFromArgs(QualType Ty, LValue Dst,
                           SmallVectorImpl<llvm::Value *>::iterator &AI);
 
-  /// ExpandTypeToArgs - Expand an RValue \arg RV, with the LLVM type for \arg
+  /// ExpandTypeToArgs - Expand an CallArg \arg Arg, with the LLVM type for \arg
   /// Ty, into individual arguments on the provided vector \arg IRCallArgs,
   /// starting at index \arg IRCallArgPos. See ABIArgInfo::Expand.
-  void ExpandTypeToArgs(QualType Ty, RValue RV, llvm::FunctionType *IRFuncTy,
+  void ExpandTypeToArgs(QualType Ty, CallArg Arg, llvm::FunctionType *IRFuncTy,
                         SmallVectorImpl<llvm::Value *> &IRCallArgs,
                         unsigned &IRCallArgPos);