Introduce a special cursor kind for the translation unit, to serve as

the root of the conceptual cursor hierarchy (just like we do with
declarations). This will be used when we get to unify
clang_loadTranslationUnit() and clang_loadDeclaration() into something
more generally useful.

llvm-svn: 93954

3 files changed, 20 insertions, 0 deletions

diff --git a/clang/tools/CIndex/CIndex.cpp b/clang/tools/CIndex/CIndex.cpp
index 032dd126f69..8dfaa4cbe12 100644
--- a/clang/tools/CIndex/CIndex.cpp
+++ b/clang/tools/CIndex/CIndex.cpp
@@ -565,6 +565,11 @@ CXString clang_getTranslationUnitSpelling(CXTranslationUnit CTUnit) {
                                   true);
 }
 
+CXCursor clang_getTranslationUnitCursor(CXTranslationUnit TU) {
+  CXCursor Result = { CXCursor_TranslationUnit, { TU, 0, 0 } };
+  return Result;
+}
+
 void clang_loadTranslationUnit(CXTranslationUnit CTUnit,
                                CXTranslationUnitIterator callback,
                                CXClientData CData) {
@@ -803,6 +808,9 @@ static Decl *getDeclFromExpr(Stmt *E) {
 extern "C" {
 CXString clang_getCursorSpelling(CXCursor C) {
   assert(getCursorDecl(C) && "CXCursor has null decl");
+  if (clang_isTranslationUnit(C.kind))
+    return clang_getTranslationUnitSpelling(C.data[0]);
+
   if (clang_isReference(C.kind)) {
     switch (C.kind) {
     case CXCursor_ObjCSuperClassRef: {
@@ -867,6 +875,7 @@ const char *clang_getCursorKindSpelling(enum CXCursorKind Kind) {
   case CXCursor_InvalidFile: return "InvalidFile";
   case CXCursor_NoDeclFound: return "NoDeclFound";
   case CXCursor_NotImplemented: return "NotImplemented";
+  case CXCursor_TranslationUnit: return "TranslationUnit";
   }
   
   llvm_unreachable("Unhandled CXCursorKind");
@@ -947,6 +956,10 @@ unsigned clang_isStatement(enum CXCursorKind K) {
   return K >= CXCursor_FirstStmt && K <= CXCursor_LastStmt;
 }
 
+unsigned clang_isTranslationUnit(enum CXCursorKind K) {
+  return K == CXCursor_TranslationUnit;
+}
+
 CXCursorKind clang_getCursorKind(CXCursor C) {
   return C.kind;
 }
diff --git a/clang/tools/CIndex/CIndex.exports b/clang/tools/CIndex/CIndex.exports
index b05c2ccad38..7a70e545b60 100644
--- a/clang/tools/CIndex/CIndex.exports
+++ b/clang/tools/CIndex/CIndex.exports
@@ -39,6 +39,7 @@ _clang_getNullCursor
 _clang_getNumCompletionChunks
 _clang_getRangeEnd
 _clang_getRangeStart
+_clang_getTranslationUnitCursor
 _clang_getTranslationUnitSpelling
 _clang_isCursorDefinition
 _clang_isDeclaration
@@ -46,6 +47,7 @@ _clang_isExpression
 _clang_isInvalid
 _clang_isReference
 _clang_isStatement
+_clang_isTranslationUnit
 _clang_loadDeclaration
 _clang_loadTranslationUnit
 _clang_setUseExternalASTGeneration
diff --git a/clang/tools/CIndex/CXCursor.cpp b/clang/tools/CIndex/CXCursor.cpp
index f13e2eea89f..7dd3ae9cc00 100644
--- a/clang/tools/CIndex/CXCursor.cpp
+++ b/clang/tools/CIndex/CXCursor.cpp
@@ -14,6 +14,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "CXCursor.h"
+#include "clang/Frontend/ASTUnit.h"
 #include "clang/AST/Decl.h"
 #include "clang/AST/DeclObjC.h"
 #include "clang/AST/Expr.h"
@@ -320,6 +321,10 @@ ASTContext &cxcursor::getCursorContext(CXCursor Cursor) {
   case CXCursor_UnexposedStmt:
     return static_cast<Decl *>(Cursor.data[0])->getASTContext();
 
+  case CXCursor_TranslationUnit: {
+    ASTUnit *CXXUnit = static_cast<ASTUnit *>(Cursor.data[0]);
+    return CXXUnit->getASTContext();
+  }
   }
   
   llvm_unreachable("No context available");