[libclang] Introduce clang_Location_isInSystemHeader to check if a location resides in a system header.

This is a modified patch provided from Mikołaj Siedlarek!

llvm-svn: 179384

clang/include/clang-c/Index.h

@@ -32,7 +32,7 @@
  * compatible, thus CINDEX_VERSION_MAJOR is expected to remain stable.
  */
 #define CINDEX_VERSION_MAJOR 0
-#define CINDEX_VERSION_MINOR 16
+#define CINDEX_VERSION_MINOR 17
 
 #define CINDEX_VERSION_ENCODE(major, minor) ( \
       ((major) * 10000)                       \
@@ -408,6 +408,11 @@ CINDEX_LINKAGE CXSourceLocation clang_getLocationForOffset(CXTranslationUnit tu,
                                                            CXFile file,
                                                            unsigned offset);
 
+/**
+ * \brief Returns non-zero if the given source location is in a system header.
+ */
+CINDEX_LINKAGE int clang_Location_isInSystemHeader(CXSourceLocation location);
+
 /**
  * \brief Retrieve a NULL (invalid) source range.
  */

clang/tools/libclang/CXSourceLocation.cpp

@@ -198,6 +198,17 @@ static void createNullLocation(CXString *filename, unsigned *line,
 
 extern "C" {
 
+int clang_Location_isInSystemHeader(CXSourceLocation location) {
+  const SourceLocation Loc =
+    SourceLocation::getFromRawEncoding(location.int_data);
+  if (Loc.isInvalid())
+    return 0;
+
+  const SourceManager &SM =
+    *static_cast<const SourceManager*>(location.ptr_data[0]);
+  return SM.isInSystemHeader(Loc);
+}
+
 void clang_getExpansionLocation(CXSourceLocation location,
                                 CXFile *file,
                                 unsigned *line,

clang/tools/libclang/libclang.exports

@@ -248,6 +248,7 @@ clang_isUnexposed
 clang_isVirtualBase
 clang_isVolatileQualifiedType
 clang_loadDiagnostics
+clang_Location_isInSystemHeader
 clang_parseTranslationUnit
 clang_remap_dispose
 clang_remap_getFilenames