Add #pragma clang attribute

This is a recommit of r300539 that was reverted in r300543 due to test failures.
The original commit message is displayed below:

The new '#pragma clang attribute' directive can be used to apply attributes to
multiple declarations. An attribute must satisfy the following conditions to
be supported by the pragma:
- It must have a subject list that's defined in the TableGen file.
- It must be documented.
- It must not be late parsed.
- It must have a GNU/C++11 spelling.

Differential Revision: https://reviews.llvm.org/D30009

llvm-svn: 300556

1 files changed, 11 insertions, 0 deletions

diff --git a/clang/lib/Basic/Attributes.cpp b/clang/lib/Basic/Attributes.cpp
index c215366fc39..b7570d03c85 100644
--- a/clang/lib/Basic/Attributes.cpp
+++ b/clang/lib/Basic/Attributes.cpp
@@ -1,4 +1,5 @@
 #include "clang/Basic/Attributes.h"
+#include "clang/Basic/AttrSubjectMatchRules.h"
 #include "clang/Basic/IdentifierTable.h"
 #include "llvm/ADT/StringSwitch.h"
 using namespace clang;
@@ -15,3 +16,13 @@ int clang::hasAttribute(AttrSyntax Syntax, const IdentifierInfo *Scope,
 
   return 0;
 }
+
+const char *attr::getSubjectMatchRuleSpelling(attr::SubjectMatchRule Rule) {
+  switch (Rule) {
+#define ATTR_MATCH_RULE(NAME, SPELLING, IsAbstract)                            \
+  case attr::NAME:                                                             \
+    return SPELLING;
+#include "clang/Basic/AttrSubMatchRulesList.inc"
+  }
+  llvm_unreachable("Invalid subject match rule");
+}