add initial support for the gcc "alignof(decl) is the alignment of the decl
not the type" semantics. This can definitely be improved, but is better than
what we had.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@62939 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp
index f3243c2..63e4ccc 100644
--- a/lib/AST/ASTContext.cpp
+++ b/lib/AST/ASTContext.cpp
@@ -260,6 +260,26 @@
}
}
+/// getDeclAlign - Return a conservative estimate of the alignment of the
+/// specified decl. Note that bitfields do not have a valid alignment, so
+/// this method will assert on them.
+unsigned ASTContext::getDeclAlign(const Decl *D) {
+ // FIXME: If attribute(align) is specified on the decl, round up to it.
+
+ if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) {
+ QualType T = VD->getType();
+ // Incomplete or function types default to 1.
+ if (T->isIncompleteType() || T->isFunctionType())
+ return 1;
+
+ while (isa<VariableArrayType>(T) || isa<IncompleteArrayType>(T))
+ T = cast<ArrayType>(T)->getElementType();
+
+ return getTypeAlign(T);
+ }
+
+ return 1;
+}
/// getTypeSize - Return the size of the specified type, in bits. This method
/// does not work on incomplete types.