Start of a Sema implementation for #pragma weak. This isn't really the
right approach, but I'm still not sure what the best way to go about this is.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72912 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/Basic/DiagnosticSemaKinds.td b/include/clang/Basic/DiagnosticSemaKinds.td
index 41e73c1..4b9b703 100644
--- a/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/include/clang/Basic/DiagnosticSemaKinds.td
@@ -131,6 +131,8 @@
def warn_pragma_unused_expected_localvar : Warning<
"only local variables can be arguments to '#pragma unused'">;
+def err_unsupported_pragma_weak : Error<
+ "using '#pragma weak' to refer to an undeclared identifier is not yet supported">;
/// Objective-C parser diagnostics
def err_duplicate_class_def : Error<
diff --git a/lib/Sema/Sema.h b/lib/Sema/Sema.h
index d8cc01e..fef476f 100644
--- a/lib/Sema/Sema.h
+++ b/lib/Sema/Sema.h
@@ -2449,7 +2449,19 @@
SourceLocation PragmaLoc,
SourceLocation LParenLoc,
SourceLocation RParenLoc);
-
+
+ /// ActOnPragmaPack - Called on well formed #pragma weak ident.
+ virtual void ActOnPragmaWeakID(IdentifierInfo* WeakName,
+ SourceLocation PragmaLoc,
+ SourceLocation WeakNameLoc);
+
+ /// ActOnPragmaPack - Called on well formed #pragma weak ident = ident.
+ virtual void ActOnPragmaWeakAlias(IdentifierInfo* WeakName,
+ IdentifierInfo* AliasName,
+ SourceLocation PragmaLoc,
+ SourceLocation WeakNameLoc,
+ SourceLocation AliasNameLoc);
+
/// getPragmaPackAlignment() - Return the current alignment as specified by
/// the current #pragma pack directive, or 0 if none is currently active.
unsigned getPragmaPackAlignment() const;
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index a39ff47..18636a4 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -4414,3 +4414,33 @@
CurContext->addDecl(Context, New);
return DeclPtrTy::make(New);
}
+
+void Sema::ActOnPragmaWeakID(IdentifierInfo* Name,
+ SourceLocation PragmaLoc,
+ SourceLocation NameLoc) {
+ Decl *PrevDecl = LookupName(TUScope, Name, LookupOrdinaryName);
+
+ // FIXME: This implementation is an ugly hack!
+ if (PrevDecl) {
+ PrevDecl->addAttr(::new (Context) WeakAttr());
+ return;
+ }
+ Diag(PragmaLoc, diag::err_unsupported_pragma_weak);
+ return;
+}
+
+void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name,
+ IdentifierInfo* AliasName,
+ SourceLocation PragmaLoc,
+ SourceLocation NameLoc,
+ SourceLocation AliasNameLoc) {
+ Decl *PrevDecl = LookupName(TUScope, Name, LookupOrdinaryName);
+
+ // FIXME: This implementation is an ugly hack!
+ if (PrevDecl) {
+ PrevDecl->addAttr(::new (Context) AliasAttr(AliasName->getName()));
+ return;
+ }
+ Diag(PragmaLoc, diag::err_unsupported_pragma_weak);
+ return;
+}