Implement '#pragma unused'.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67569 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaAttr.cpp b/lib/Sema/SemaAttr.cpp
index 37962ad..a799169 100644
--- a/lib/Sema/SemaAttr.cpp
+++ b/lib/Sema/SemaAttr.cpp
@@ -170,3 +170,41 @@
}
}
+void Sema::ActOnPragmaUnused(ExprTy **Exprs, unsigned NumExprs,
+ SourceLocation PragmaLoc,
+ SourceLocation LParenLoc,
+ SourceLocation RParenLoc) {
+
+ // Verify that all of the expressions are valid before
+ // modifying the attributes of any referenced decl.
+ Expr *ErrorExpr = 0;
+
+ for (unsigned i = 0; i < NumExprs; ++i) {
+ Expr *Ex = (Expr*) Exprs[i];
+ if (!isa<DeclRefExpr>(Ex)) {
+ ErrorExpr = Ex;
+ break;
+ }
+
+ Decl *d = cast<DeclRefExpr>(Ex)->getDecl();;
+
+ if (!isa<VarDecl>(d) || !cast<VarDecl>(d)->hasLocalStorage()) {
+ ErrorExpr = Ex;
+ break;
+ }
+ }
+
+ // Delete the expressions if we encountered any error.
+ if (ErrorExpr) {
+ Diag(ErrorExpr->getLocStart(), diag::warn_pragma_unused_expected_localvar);
+ for (unsigned i = 0; i < NumExprs; ++i)
+ ((Expr*) Exprs[i])->Destroy(Context);
+ return;
+ }
+
+ // Otherwise, add the 'unused' attribute to each referenced declaration.
+ for (unsigned i = 0; i < NumExprs; ++i) {
+ DeclRefExpr *DR = (DeclRefExpr*) Exprs[i];
+ DR->getDecl()->addAttr(::new (Context) UnusedAttr());
+ }
+}