Implement the flatten attribute.

This is a GNU attribute that causes calls within the attributed function
to be inlined where possible. It is implemented by giving such calls the
alwaysinline attribute.

Differential Revision: http://reviews.llvm.org/D3816

llvm-svn: 209217

1 files changed, 6 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CGCall.cpp b/clang/lib/CodeGen/CGCall.cpp
index e477a54c67e..31665f8851a 100644
--- a/clang/lib/CodeGen/CGCall.cpp
+++ b/clang/lib/CodeGen/CGCall.cpp
@@ -2935,6 +2935,12 @@ RValue CodeGenFunction::EmitCall(const CGFunctionInfo &CallInfo,
   if (callOrInvoke)
     *callOrInvoke = CS.getInstruction();
 
+  if (CurCodeDecl && CurCodeDecl->hasAttr<FlattenAttr>() &&
+      !CS.hasFnAttr(llvm::Attribute::NoInline))
+    Attrs =
+        Attrs.addAttribute(getLLVMContext(), llvm::AttributeSet::FunctionIndex,
+                           llvm::Attribute::AlwaysInline);
+
   CS.setAttributes(Attrs);
   CS.setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));