[libclang] Introduce clang_Cursor_isExternalSymbol that provides info about decls marked with external_source_symbol attribute

llvm-svn: 302677

3 files changed, 43 insertions, 0 deletions

diff --git a/clang/tools/c-index-test/c-index-test.c b/clang/tools/c-index-test/c-index-test.c
index 1179fbf3911..1f5d6044319 100644
--- a/clang/tools/c-index-test/c-index-test.c
+++ b/clang/tools/c-index-test/c-index-test.c
@@ -809,6 +809,19 @@ static void PrintCursor(CXCursor Cursor, const char *CommentSchemaFile) {
     if (clang_Cursor_isObjCOptional(Cursor))
       printf(" (@optional)");
 
+    {
+      CXString language;
+      CXString definedIn;
+      unsigned generated;
+      if (clang_Cursor_isExternalSymbol(Cursor, &language, &definedIn,
+                                        &generated)) {
+        printf(" (external lang: %s, defined: %s, gen: %d)",
+            clang_getCString(language), clang_getCString(definedIn), generated);
+        clang_disposeString(language);
+        clang_disposeString(definedIn);
+      }
+    }
+
     if (Cursor.kind == CXCursor_IBOutletCollectionAttr) {
       CXType T =
         clang_getCanonicalType(clang_getIBOutletCollectionType(Cursor));
diff --git a/clang/tools/libclang/CIndex.cpp b/clang/tools/libclang/CIndex.cpp
index c251d83e209..9c795ae9c5b 100644
--- a/clang/tools/libclang/CIndex.cpp
+++ b/clang/tools/libclang/CIndex.cpp
@@ -7479,6 +7479,35 @@ unsigned clang_Cursor_isVariadic(CXCursor C) {
   return 0;
 }
 
+unsigned clang_Cursor_isExternalSymbol(CXCursor C,
+                                     CXString *language, CXString *definedIn,
+                                     unsigned *isGenerated) {
+  if (!clang_isDeclaration(C.kind))
+    return 0;
+
+  const Decl *D = getCursorDecl(C);
+
+  auto getExternalSymAttr = [](const Decl *D) -> ExternalSourceSymbolAttr* {
+    if (auto *attr = D->getAttr<ExternalSourceSymbolAttr>())
+      return attr;
+    if (auto *dcd = dyn_cast<Decl>(D->getDeclContext())) {
+      if (auto *attr = dcd->getAttr<ExternalSourceSymbolAttr>())
+        return attr;
+    }
+    return nullptr;
+  };
+  if (auto *attr = getExternalSymAttr(D)) {
+    if (language)
+      *language = cxstring::createDup(attr->getLanguage());
+    if (definedIn)
+      *definedIn = cxstring::createDup(attr->getDefinedIn());
+    if (isGenerated)
+      *isGenerated = attr->getGeneratedDeclaration();
+    return 1;
+  }
+  return 0;
+}
+
 CXSourceRange clang_Cursor_getCommentRange(CXCursor C) {
   if (!clang_isDeclaration(C.kind))
     return clang_getNullRange();
diff --git a/clang/tools/libclang/libclang.exports b/clang/tools/libclang/libclang.exports
index 895dd804b00..d9a406e5741 100644
--- a/clang/tools/libclang/libclang.exports
+++ b/clang/tools/libclang/libclang.exports
@@ -35,6 +35,7 @@ clang_Cursor_getReceiverType
 clang_Cursor_isAnonymous
 clang_Cursor_isBitField
 clang_Cursor_isDynamicCall
+clang_Cursor_isExternalSymbol
 clang_Cursor_isNull
 clang_Cursor_isObjCOptional
 clang_Cursor_isVariadic