[libclang] Add clang_File_tryGetRealPathName

Summary:
clang_getFileName() may return a path relative to WorkingDir.
On Arch Linux, during clang_indexTranslationUnit(), clang_getFileName() on
CXIdxIncludedIncludedFileInfo::file may return
"/../lib64/gcc/x86_64-pc-linux-gnu/7.3.0/../../../../include/c++/7.3.0/string",
for `#include <string>`.

I presume WorkingDir is somehow changed to /usr/lib or /usr/include and
clang_getFileName() returns a path relative to WorkingDir.

clang_File_tryGetRealPathName() returns "/usr/include/c++/7.3.0/string"
which is more useful for the indexer in this case.

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D42893

llvm-svn: 329515

1 files changed, 15 insertions, 0 deletions

diff --git a/clang/unittests/libclang/LibclangTest.cpp b/clang/unittests/libclang/LibclangTest.cpp
index c44095d..17a50676 100644
--- a/clang/unittests/libclang/LibclangTest.cpp
+++ b/clang/unittests/libclang/LibclangTest.cpp
@@ -482,6 +482,21 @@ public:
   }
 };
 
+TEST_F(LibclangReparseTest, FileName) {
+  std::string CppName = "main.cpp";
+  WriteFile(CppName, "int main() {}");
+  ClangTU = clang_parseTranslationUnit(Index, CppName.c_str(), nullptr, 0,
+                                       nullptr, 0, TUFlags);
+  CXFile cxf = clang_getFile(ClangTU, CppName.c_str());
+
+  CXString cxname = clang_getFileName(cxf);
+  ASSERT_TRUE(strstr(clang_getCString(cxname), CppName.c_str()));
+  clang_disposeString(cxname);
+
+  cxname = clang_File_tryGetRealPathName(cxf);
+  ASSERT_TRUE(strstr(clang_getCString(cxname), CppName.c_str()));
+  clang_disposeString(cxname);
+}
 
 TEST_F(LibclangReparseTest, Reparse) {
   const char *HeaderTop = "#ifndef H\n#define H\nstruct Foo { int bar;";