Added rudimentary C++0x attribute support.

The following attributes are currently supported in C++0x attribute
lists (and in GNU ones as well):
 - align() - semantics believed to be conformant to n3000, except for
   redeclarations and what entities it may apply to
 - final - semantics believed to be conformant to CWG issue 817's proposed
   wording, except for redeclarations
 - noreturn - semantics believed to be conformant to n3000, except for
   redeclarations
 - carries_dependency - currently ignored (this is an optimization hint)

llvm-svn: 89543

1 files changed, 6 insertions, 2 deletions

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 1fbd3b92735..b8027d8314d 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -353,8 +353,12 @@ void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
   else if (Features.getStackProtectorMode() == LangOptions::SSPReq)
     F->addFnAttr(llvm::Attribute::StackProtectReq);
   
-  if (const AlignedAttr *AA = D->getAttr<AlignedAttr>())
-    F->setAlignment(AA->getAlignment()/8);
+  if (const AlignedAttr *AA = D->getAttr<AlignedAttr>()) {
+    unsigned width = Context.Target.getCharWidth();
+    F->setAlignment(AA->getAlignment() / width);
+    while ((AA = AA->getNext<AlignedAttr>()))
+      F->setAlignment(std::max(F->getAlignment(), AA->getAlignment() / width));
+  }
   // C++ ABI requires 2-byte alignment for member functions.
   if (F->getAlignment() < 2 && isa<CXXMethodDecl>(D))
     F->setAlignment(2);