AArch64: fix weird edge case in ABI.

It turns out there are some sort-of-but-not-quite empty structs that break all
the rules. For example:

struct SuperEmpty { int arr[0]; };
struct SortOfEmpty { struct SuperEmpty e; };

Both of these have sizeof == 0, even in C++ mode, for GCC compatibility. The
first one also doesn't occupy a register when passed by value in GNU C++ mode,
unlike everything else.

On Darwin, we want to ignore the lot (and especially don't want to try to use
an i0 as we were).

llvm-svn: 302313

1 files changed, 9 insertions, 4 deletions

diff --git a/clang/lib/CodeGen/TargetInfo.cpp b/clang/lib/CodeGen/TargetInfo.cpp
index ecd81d84b1f..4ebbef7dfb5 100644
--- a/clang/lib/CodeGen/TargetInfo.cpp
+++ b/clang/lib/CodeGen/TargetInfo.cpp
@@ -4890,10 +4890,16 @@ ABIArgInfo AArch64ABIInfo::classifyArgumentType(QualType Ty) const {
 
   // Empty records are always ignored on Darwin, but actually passed in C++ mode
   // elsewhere for GNU compatibility.
-  if (isEmptyRecord(getContext(), Ty, true)) {
+  uint64_t Size = getContext().getTypeSize(Ty);
+  bool IsEmpty = isEmptyRecord(getContext(), Ty, true);
+  if (IsEmpty || Size == 0) {
     if (!getContext().getLangOpts().CPlusPlus || isDarwinPCS())
       return ABIArgInfo::getIgnore();
 
+    // GNU C mode. The only argument that gets ignored is an empty one with size
+    // 0.
+    if (IsEmpty && Size == 0)
+      return ABIArgInfo::getIgnore();
     return ABIArgInfo::getDirect(llvm::Type::getInt8Ty(getVMContext()));
   }
 
@@ -4906,7 +4912,6 @@ ABIArgInfo AArch64ABIInfo::classifyArgumentType(QualType Ty) const {
   }
 
   // Aggregates <= 16 bytes are passed directly in registers or on the stack.
-  uint64_t Size = getContext().getTypeSize(Ty);
   if (Size <= 128) {
     // On RenderScript, coerce Aggregates <= 16 bytes to an integer array of
     // same size and alignment.
@@ -4946,7 +4951,8 @@ ABIArgInfo AArch64ABIInfo::classifyReturnType(QualType RetTy) const {
                 : ABIArgInfo::getDirect());
   }
 
-  if (isEmptyRecord(getContext(), RetTy, true))
+  uint64_t Size = getContext().getTypeSize(RetTy);
+  if (isEmptyRecord(getContext(), RetTy, true) || Size == 0)
     return ABIArgInfo::getIgnore();
 
   const Type *Base = nullptr;
@@ -4956,7 +4962,6 @@ ABIArgInfo AArch64ABIInfo::classifyReturnType(QualType RetTy) const {
     return ABIArgInfo::getDirect();
 
   // Aggregates <= 16 bytes are returned directly in registers or on the stack.
-  uint64_t Size = getContext().getTypeSize(RetTy);
   if (Size <= 128) {
     // On RenderScript, coerce Aggregates <= 16 bytes to an integer array of
     // same size and alignment.