Added prototype implementation of the DeclGroup, DeclGroupRef, and DeclGroupOwningRef classes.

Documentation and testing are pending.

llvm-svn: 56611

1 files changed, 59 insertions, 0 deletions

diff --git a/clang/lib/AST/DeclGroup.cpp b/clang/lib/AST/DeclGroup.cpp
new file mode 100644
index 00000000000..5987d5a7012
--- /dev/null
+++ b/clang/lib/AST/DeclGroup.cpp
@@ -0,0 +1,59 @@
+//===--- DeclGroup.cpp - Classes for representing groups of Decls -*- C++ -*-==//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines the DeclGroup, DeclGroupRef, and OwningDeclGroup classes.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/AST/DeclGroup.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/ASTContext.h"
+#include "llvm/Support/Allocator.h"
+
+using namespace clang;
+
+DeclGroup* DeclGroup::Create(ASTContext& C, unsigned numdecls, Decl** decls) {
+  unsigned size = sizeof(DeclGroup) + sizeof(Decl*) * numdecls;
+  unsigned alignment = llvm::AlignOf<DeclGroup>::Alignment;  
+  void* mem = C.getAllocator().Allocate(size, alignment);                                                   
+  new (mem) DeclGroup(numdecls, decls);
+  return static_cast<DeclGroup*>(mem);
+}
+
+DeclGroup::DeclGroup(unsigned numdecls, Decl** decls) {
+  assert (numdecls > 0);
+  assert (decls);
+  memcpy(this+1, decls, numdecls * sizeof(*decls));
+}
+
+void DeclGroup::Destroy(ASTContext& C) {
+  Decl** Decls = (Decl**) this + 1;
+  
+  for (unsigned i = 0; i < NumDecls; ++i)
+    Decls[i]->Destroy(C);
+  
+  this->~DeclGroup();
+  C.getAllocator().Deallocate((void*) this);
+}
+
+DeclGroupOwningRef::~DeclGroupOwningRef() {
+  assert (ThePtr == 0 && "Destroy method not called.");
+}
+
+void DeclGroupOwningRef::Destroy(ASTContext& C) {
+  if (!ThePtr)
+    return;
+  
+  if (getKind() == DeclKind)
+    reinterpret_cast<Decl*>(ThePtr)->Destroy(C);
+  else
+    reinterpret_cast<DeclGroup*>(ThePtr & ~Mask)->Destroy(C);
+  
+  ThePtr = 0;
+}