[Mangle] Add flag to asm labels to disable '\01' prefixing

LLDB synthesizes decls using asm labels. These decls cannot have a mangle
different than the one specified in the label name. I.e., the '\01' prefix
should not be added.

Fixes an expression evaluation failure in lldb's TestVirtual.py on iOS.

rdar://45827323

Differential Revision: https://reviews.llvm.org/D67774

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@372903 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 7 deletions

diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 42ce5f183a..7274fc96c5 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -2766,7 +2766,7 @@ void Sema::mergeDeclAttributes(NamedDecl *New, Decl *Old,
 
   if (AsmLabelAttr *NewA = New->getAttr<AsmLabelAttr>()) {
     if (AsmLabelAttr *OldA = Old->getAttr<AsmLabelAttr>()) {
-      if (OldA->getLabel() != NewA->getLabel()) {
+      if (!OldA->isEquivalent(NewA)) {
         // This redeclaration changes __asm__ label.
         Diag(New->getLocation(), diag::err_different_asm_label);
         Diag(OldA->getLocation(), diag::note_previous_declaration);
@@ -6983,8 +6983,8 @@ NamedDecl *Sema::ActOnVariableDeclarator(
       }
     }
 
-    NewVD->addAttr(::new (Context)
-                       AsmLabelAttr(Context, SE->getStrTokenLoc(0), Label));
+    NewVD->addAttr(::new (Context) AsmLabelAttr(
+        Context, SE->getStrTokenLoc(0), Label, /*IsLiteralLabel=*/true));
   } else if (!ExtnameUndeclaredIdentifiers.empty()) {
     llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I =
       ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier());
@@ -8882,8 +8882,9 @@ Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC,
   if (Expr *E = (Expr*) D.getAsmLabel()) {
     // The parser guarantees this is a string.
     StringLiteral *SE = cast<StringLiteral>(E);
-    NewFD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getStrTokenLoc(0),
-                                                SE->getString()));
+    NewFD->addAttr(::new (Context)
+                       AsmLabelAttr(Context, SE->getStrTokenLoc(0),
+                                    SE->getString(), /*IsLiteralLabel=*/true));
   } else if (!ExtnameUndeclaredIdentifiers.empty()) {
     llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I =
       ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier());
@@ -17555,8 +17556,8 @@ void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name,
                                          LookupOrdinaryName);
   AttributeCommonInfo Info(AliasName, SourceRange(AliasNameLoc),
                            AttributeCommonInfo::AS_Pragma);
-  AsmLabelAttr *Attr =
-      AsmLabelAttr::CreateImplicit(Context, AliasName->getName(), Info);
+  AsmLabelAttr *Attr = AsmLabelAttr::CreateImplicit(
+      Context, AliasName->getName(), /*LiteralLabel=*/true, Info);
 
   // If a declaration that:
   // 1) declares a function or a variable