Add "multiple format attributes" support on block.

llvm-svn: 148890

2 files changed, 16 insertions, 6 deletions

diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index dbb0a0efaa4..f5a8b448a17 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -508,11 +508,6 @@ bool Sema::CheckObjCMethodCall(ObjCMethodDecl *Method, SourceLocation lbrac,
 }
 
 bool Sema::CheckBlockCall(NamedDecl *NDecl, CallExpr *TheCall) {
-  // Printf checking.
-  const FormatAttr *Format = NDecl->getAttr<FormatAttr>();
-  if (!Format)
-    return false;
-
   const VarDecl *V = dyn_cast<VarDecl>(NDecl);
   if (!V)
     return false;
@@ -521,7 +516,12 @@ bool Sema::CheckBlockCall(NamedDecl *NDecl, CallExpr *TheCall) {
   if (!Ty->isBlockPointerType())
     return false;
 
-  CheckFormatArguments(Format, TheCall);
+  // format string checking.
+  for (specific_attr_iterator<FormatAttr>
+       i = NDecl->specific_attr_begin<FormatAttr>(),
+       e = NDecl->specific_attr_end<FormatAttr>(); i != e ; ++i) {
+    CheckFormatArguments(*i, TheCall);
+  }
 
   return false;
 }
diff --git a/clang/test/Sema/block-printf-attribute-1.c b/clang/test/Sema/block-printf-attribute-1.c
index 8188ba5b55f..dd678a5439c 100644
--- a/clang/test/Sema/block-printf-attribute-1.c
+++ b/clang/test/Sema/block-printf-attribute-1.c
@@ -1,5 +1,7 @@
 // RUN: %clang_cc1 %s -fsyntax-only -verify -fblocks
 
+#include <stdarg.h>
+
 int main() {
   void (^b) (int arg, const char * format, ...) __attribute__ ((__format__ (__printf__, 1, 3))) =   // expected-error {{format argument not a string type}}
     ^ __attribute__ ((__format__ (__printf__, 1, 3))) (int arg, const char * format, ...) {}; // expected-error {{format argument not a string type}}
@@ -9,3 +11,11 @@ int main() {
   z(1, "%s", 1); // expected-warning{{format specifies type 'char *' but the argument has type 'int'}}
   z(1, "%s", "HELLO"); // no-warning
 }
+
+void multi_attr(va_list ap, int *x, long *y) {
+  // Handle block with multiple format attributes.
+  void (^vprintf_scanf) (const char *, va_list, const char *, ...) __attribute__((__format__(__printf__, 1, 0))) __attribute__((__format__(__scanf__, 3, 4))) =
+  ^ __attribute__((__format__(__printf__, 1, 0))) __attribute__((__format__(__scanf__, 3, 4))) (const char *str, va_list args, const char *fmt, ...) {};
+
+  vprintf_scanf("%", ap, "%d"); // expected-warning {{incomplete format specifier}}, expected-warning {{more '%' conversions than data arguments}}
+}