ms-inline-asm: Scope inline asm labels to functions

Summary:
This fixes PR20023.  In order to implement this scoping rule, we piggy
back on the existing LabelDecl machinery, by creating LabelDecl's that
will carry the "internal" name of the inline assembly label, which we
will rewrite the asm label to.

Reviewers: rnk

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D4589

llvm-svn: 218230

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/lib/AST/Decl.cpp b/clang/lib/AST/Decl.cpp
index cc7c11ca6ef..aec7059490c 100644
--- a/clang/lib/AST/Decl.cpp
+++ b/clang/lib/AST/Decl.cpp
@@ -3709,6 +3709,13 @@ LabelDecl *LabelDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
                                SourceLocation());
 }
 
+void LabelDecl::setMSAsmLabel(StringRef Name) {
+  char *Buffer = new (getASTContext(), 1) char[Name.size() + 1];
+  memcpy(Buffer, Name.data(), Name.size());
+  Buffer[Name.size()] = '\0';
+  MSAsmName = Buffer;
+}
+
 void ValueDecl::anchor() { }
 
 bool ValueDecl::isWeak() const {