Implement libclang API functions for retrieving the lexical and
semantic parents of the given cursor.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@114587 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CIndex.cpp b/tools/libclang/CIndex.cpp
index c0cecff..6d6938a 100644
--- a/tools/libclang/CIndex.cpp
+++ b/tools/libclang/CIndex.cpp
@@ -4018,6 +4018,36 @@
 
   return CXLanguage_Invalid;
 }
+  
+CXCursor clang_getCursorSemanticParent(CXCursor cursor) {
+  if (clang_isDeclaration(cursor.kind)) {
+    if (Decl *D = getCursorDecl(cursor)) {
+      DeclContext *DC = D->getDeclContext();
+      return MakeCXCursor(cast<Decl>(DC), getCursorASTUnit(cursor));
+    }
+  }
+  
+  if (clang_isStatement(cursor.kind) || clang_isExpression(cursor.kind)) {
+    if (Decl *D = getCursorDecl(cursor))
+      return MakeCXCursor(D, getCursorASTUnit(cursor));
+  }
+  
+  return clang_getNullCursor();
+}
+
+CXCursor clang_getCursorLexicalParent(CXCursor cursor) {
+  if (clang_isDeclaration(cursor.kind)) {
+    if (Decl *D = getCursorDecl(cursor)) {
+      DeclContext *DC = D->getLexicalDeclContext();
+      return MakeCXCursor(cast<Decl>(DC), getCursorASTUnit(cursor));
+    }
+  }
+
+  // FIXME: Note that we can't easily compute the lexical context of a 
+  // statement or expression, so we return nothing.
+  return clang_getNullCursor();
+}
+
 } // end: extern "C"
 
 
diff --git a/tools/libclang/libclang.darwin.exports b/tools/libclang/libclang.darwin.exports
index 6b30da4..da1a6ee 100644
--- a/tools/libclang/libclang.darwin.exports
+++ b/tools/libclang/libclang.darwin.exports
@@ -45,10 +45,12 @@
 _clang_getCursorKind
 _clang_getCursorKindSpelling
 _clang_getCursorLanguage
+_clang_getCursorLexicalParent
 _clang_getCursorLinkage
 _clang_getCursorLocation
 _clang_getCursorReferenced
 _clang_getCursorResultType
+_clang_getCursorSemanticParent
 _clang_getCursorSpelling
 _clang_getCursorType
 _clang_getCursorUSR
diff --git a/tools/libclang/libclang.exports b/tools/libclang/libclang.exports
index 798ec32..511c85d 100644
--- a/tools/libclang/libclang.exports
+++ b/tools/libclang/libclang.exports
@@ -45,10 +45,12 @@
 clang_getCursorKind
 clang_getCursorKindSpelling
 clang_getCursorLanguage
+clang_getCursorLexicalParent
 clang_getCursorLinkage
 clang_getCursorLocation
 clang_getCursorReferenced
 clang_getCursorResultType
+clang_getCursorSemanticParent
 clang_getCursorSpelling
 clang_getCursorType
 clang_getCursorUSR