From 76187b4d689a6ce601f2055b3dad5be6a4ab1012 Mon Sep 17 00:00:00 2001
From: Anders Carlsson <andersca@mac.com>
Date: Fri, 13 Feb 2009 06:46:13 +0000
Subject: [PATCH] Add sema support for the nodebug attribute.

llvm-svn: 64441
---
 clang/include/clang/AST/Attr.h            | 13 ++++++++++++-
 clang/include/clang/Parse/AttributeList.h |  1 +
 clang/lib/Parse/AttributeList.cpp         |  1 +
 clang/lib/Sema/SemaDeclAttr.cpp           | 19 ++++++++++++++++++-
 clang/test/Sema/attr-nodebug.c            |  8 ++++++++
 5 files changed, 40 insertions(+), 2 deletions(-)
 create mode 100644 clang/test/Sema/attr-nodebug.c

diff --git a/clang/include/clang/AST/Attr.h b/clang/include/clang/AST/Attr.h
index 60b84f43c3a5..c951ba712e81 100644
--- a/clang/include/clang/AST/Attr.h
+++ b/clang/include/clang/AST/Attr.h
@@ -55,7 +55,8 @@ public:
     Blocks,
     Const,
     Pure,
-    Cleanup
+    Cleanup,
+    Nodebug
   };
     
 private:
@@ -493,6 +494,16 @@ public:
   static bool classof(const CleanupAttr *A) { return true; }
 };
 
+class NodebugAttr : public Attr {
+public:
+  NodebugAttr() : Attr(Nodebug) {}
+    
+  // Implement isa/cast/dyncast/etc.
+    
+  static bool classof(const Attr *A) { return A->getKind() == Nodebug; }
+  static bool classof(const DeprecatedAttr *A) { return true; }
+};
+  
 }  // end namespace clang
 
 #endif
diff --git a/clang/include/clang/Parse/AttributeList.h b/clang/include/clang/Parse/AttributeList.h
index 56f30d38f437..e5384ddbcd10 100644
--- a/clang/include/clang/Parse/AttributeList.h
+++ b/clang/include/clang/Parse/AttributeList.h
@@ -80,6 +80,7 @@ public:
     AT_const,
     AT_nsobject,
     AT_cleanup,
+    AT_nodebug,
     UnknownAttribute
   };
   
diff --git a/clang/lib/Parse/AttributeList.cpp b/clang/lib/Parse/AttributeList.cpp
index c540da74f154..71712b646f84 100644
--- a/clang/lib/Parse/AttributeList.cpp
+++ b/clang/lib/Parse/AttributeList.cpp
@@ -70,6 +70,7 @@ AttributeList::Kind AttributeList::getKind(const IdentifierInfo *Name) {
   case 7:
     if (!memcmp(Str, "aligned", 7)) return AT_aligned;
     if (!memcmp(Str, "cleanup", 7)) return AT_cleanup;
+    if (!memcmp(Str, "nodebug", 7)) return AT_nodebug;
     if (!memcmp(Str, "nonnull", 7)) return AT_nonnull;
     if (!memcmp(Str, "nothrow", 7)) return AT_nothrow;
     if (!memcmp(Str, "objc_gc", 7)) return AT_objc_gc;
diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index c08634c7889d..4bca3d9fc760 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -1304,6 +1304,22 @@ static void HandleModeAttr(Decl *D, const AttributeList &Attr, Sema &S) {
     cast<ValueDecl>(D)->setType(NewTy);
 }
 
+static void HandleNodebugAttr(Decl *d, const AttributeList &Attr, Sema &S) {
+  // check the attribute arguments.
+  if (Attr.getNumArgs() > 0) {
+    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0;
+    return;
+  }
+  FunctionDecl *Fn = dyn_cast<FunctionDecl>(d);
+  if (!Fn) {
+    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
+      << "nodebug" << "function";
+    return;
+  }
+  
+  d->addAttr(new NodebugAttr());
+}
+
 //===----------------------------------------------------------------------===//
 // Top Level Sema Entry Points
 //===----------------------------------------------------------------------===//
@@ -1355,10 +1371,11 @@ static void ProcessDeclAttribute(Decl *D, const AttributeList &Attr, Sema &S) {
   case AttributeList::AT_const:       HandleConstAttr     (D, Attr, S); break;
   case AttributeList::AT_pure:        HandlePureAttr      (D, Attr, S); break;
   case AttributeList::AT_cleanup:     HandleCleanupAttr   (D, Attr, S); break;
+  case AttributeList::AT_nodebug:     HandleNodebugAttr   (D, Attr, S); break;
   default:
 #if 0
     // TODO: when we have the full set of attributes, warn about unknown ones.
-    S.Diag(Attr->getLoc(), diag::warn_attribute_ignored) << Attr->getName();
+    S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
 #endif
     break;
   }
diff --git a/clang/test/Sema/attr-nodebug.c b/clang/test/Sema/attr-nodebug.c
new file mode 100644
index 000000000000..a3b525c4938b
--- /dev/null
+++ b/clang/test/Sema/attr-nodebug.c
@@ -0,0 +1,8 @@
+// RUN: clang %s -verify -fsyntax-only
+
+int a __attribute__((nodebug)); // expected-warning {{'nodebug' attribute only applies to function types}}
+
+void t1() __attribute__((nodebug));
+
+void t2() __attribute__((nodebug(2))); // expected-error {{attribute requires 0 argument(s)}}
+