libclang: Add a function to libclang for retrieving the bit width value

Patch by Jyun-Yan You.

llvm-svn: 169276

2 files changed, 16 insertions, 0 deletions

diff --git a/clang/tools/libclang/CXType.cpp b/clang/tools/libclang/CXType.cpp
index c4b8a09a547..e2fbc0be82e 100644
--- a/clang/tools/libclang/CXType.cpp
+++ b/clang/tools/libclang/CXType.cpp
@@ -265,6 +265,21 @@ unsigned long long clang_getEnumConstantDeclUnsignedValue(CXCursor C) {
   return ULLONG_MAX;
 }
 
+int clang_getFieldDeclBitWidth(CXCursor C) {
+  using namespace cxcursor;
+
+  if (clang_isDeclaration(C.kind)) {
+    Decl *D = getCursorDecl(C);
+
+    if (FieldDecl *FD = dyn_cast_or_null<FieldDecl>(D)) {
+      if (FD->isBitField())
+        return FD->getBitWidthValue(getCursorContext(C));
+    }
+  }
+
+  return -1;
+}
+
 CXType clang_getCanonicalType(CXType CT) {
   if (CT.kind == CXType_Invalid)
     return CT;
diff --git a/clang/tools/libclang/libclang.exports b/clang/tools/libclang/libclang.exports
index ee34edcbb2d..68bfb71f18f 100644
--- a/clang/tools/libclang/libclang.exports
+++ b/clang/tools/libclang/libclang.exports
@@ -160,6 +160,7 @@ clang_getElementType
 clang_getEnumConstantDeclUnsignedValue
 clang_getEnumConstantDeclValue
 clang_getEnumDeclIntegerType
+clang_getFieldDeclBitWidth
 clang_getExpansionLocation
 clang_getFile
 clang_getFileName