This revision was automatically updated to reflect the committed changes.
Closed by commit rLLDB355463: [ExpressionParser] Test GetClangResourceDir 
(authored by xiaobai, committed by ).
Herald added a project: LLDB.

Changed prior to commit:
  https://reviews.llvm.org/D58748?vs=189392&id=189427#toc

Repository:
  rLLDB LLDB

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D58748/new/

https://reviews.llvm.org/D58748

Files:
  packages/Python/lldbsuite/test/functionalities/paths/TestPaths.py
  source/Plugins/ExpressionParser/Clang/ClangHost.cpp
  source/Plugins/ExpressionParser/Clang/ClangHost.h
  unittests/Expression/ClangParserTest.cpp

Index: packages/Python/lldbsuite/test/functionalities/paths/TestPaths.py
===================================================================
--- packages/Python/lldbsuite/test/functionalities/paths/TestPaths.py
+++ packages/Python/lldbsuite/test/functionalities/paths/TestPaths.py
@@ -32,6 +32,15 @@
             # No directory path types should have the filename set
             self.assertTrue(f.GetFilename() is None)
 
+    # TODO: Merge into test_path when GetClangResourceDir is implemented on
+    # windows
+    @expectedFailureAll(oslist=["windows"])
+    @no_debug_info_test
+    def test_clang_dir_path(self):
+      '''Test to make sure clang dir is set correctly'''
+      clang_dir = lldb.SBHostOS.GetLLDBPath(lldb.ePathTypeClangDir)
+      self.assertFalse(clang_dir.GetDirectory() is None)
+
     @no_debug_info_test
     def test_directory_doesnt_end_with_slash(self):
         current_directory_spec = lldb.SBFileSpec(os.path.curdir)
Index: unittests/Expression/ClangParserTest.cpp
===================================================================
--- unittests/Expression/ClangParserTest.cpp
+++ unittests/Expression/ClangParserTest.cpp
@@ -6,6 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "clang/Basic/Version.h"
+
 #include "Plugins/ExpressionParser/Clang/ClangHost.h"
 #include "TestingSupport/TestUtilities.h"
 #include "lldb/Host/FileSystem.h"
@@ -29,32 +31,44 @@
 };
 } // namespace
 
-#ifdef __APPLE__
-static std::string ComputeClangDir(std::string lldb_shlib_path,
-                                   bool verify = false) {
+#if !defined(_WIN32)
+static std::string ComputeClangResourceDir(std::string lldb_shlib_path,
+                                           bool verify = false) {
   FileSpec clang_dir;
   FileSpec lldb_shlib_spec(lldb_shlib_path);
-  ComputeClangDirectory(lldb_shlib_spec, clang_dir, verify);
+  ComputeClangResourceDirectory(lldb_shlib_spec, clang_dir, verify);
   return clang_dir.GetPath();
 }
 
+TEST_F(ClangHostTest, ComputeClangResourceDirectory) {
+  std::string path_to_liblldb = "/foo/bar/lib/";
+  std::string path_to_clang_dir = "/foo/bar/lib/clang/" CLANG_VERSION_STRING;
+  EXPECT_EQ(ComputeClangResourceDir(path_to_liblldb), path_to_clang_dir);
+
+  // The path doesn't really exist, so setting verify to true should make
+  // ComputeClangResourceDir to not give you path_to_clang_dir.
+  EXPECT_NE(ComputeClangResourceDir(path_to_liblldb, true),
+            ComputeClangResourceDir(path_to_liblldb));
+}
+
+#if defined(__APPLE__)
 TEST_F(ClangHostTest, MacOSX) {
   // This returns whatever the POSIX fallback returns.
   std::string posix = "/usr/lib/liblldb.dylib";
-  EXPECT_FALSE(ComputeClangDir(posix).empty());
+  EXPECT_FALSE(ComputeClangResourceDir(posix).empty());
 
   std::string build =
       "/lldb-macosx-x86_64/Library/Frameworks/LLDB.framework/Versions/A";
   std::string build_clang =
       "/lldb-macosx-x86_64/Library/Frameworks/LLDB.framework/Resources/Clang";
-  EXPECT_EQ(ComputeClangDir(build), build_clang);
+  EXPECT_EQ(ComputeClangResourceDir(build), build_clang);
 
   std::string xcode = "/Applications/Xcode.app/Contents/SharedFrameworks/"
                       "LLDB.framework/Versions/A";
   std::string xcode_clang =
       "/Applications/Xcode.app/Contents/Developer/Toolchains/"
       "XcodeDefault.xctoolchain/usr/lib/swift/clang";
-  EXPECT_EQ(ComputeClangDir(xcode), xcode_clang);
+  EXPECT_EQ(ComputeClangResourceDir(xcode), xcode_clang);
 
   std::string toolchain =
       "/Applications/Xcode.app/Contents/Developer/Toolchains/"
@@ -63,17 +77,18 @@
   std::string toolchain_clang =
       "/Applications/Xcode.app/Contents/Developer/Toolchains/"
       "Swift-4.1-development-snapshot.xctoolchain/usr/lib/swift/clang";
-  EXPECT_EQ(ComputeClangDir(toolchain), toolchain_clang);
+  EXPECT_EQ(ComputeClangResourceDir(toolchain), toolchain_clang);
 
   std::string cltools = "/Library/Developer/CommandLineTools/Library/"
                         "PrivateFrameworks/LLDB.framework";
   std::string cltools_clang =
       "/Library/Developer/CommandLineTools/Library/PrivateFrameworks/"
       "LLDB.framework/Resources/Clang";
-  EXPECT_EQ(ComputeClangDir(cltools), cltools_clang);
+  EXPECT_EQ(ComputeClangResourceDir(cltools), cltools_clang);
 
   // Test that a bogus path is detected.
-  EXPECT_NE(ComputeClangDir(GetInputFilePath(xcode), true),
-            ComputeClangDir(GetInputFilePath(xcode)));
+  EXPECT_NE(ComputeClangResourceDir(GetInputFilePath(xcode), true),
+            ComputeClangResourceDir(GetInputFilePath(xcode)));
 }
-#endif
+#endif // __APPLE__
+#endif // !_WIN32
Index: source/Plugins/ExpressionParser/Clang/ClangHost.h
===================================================================
--- source/Plugins/ExpressionParser/Clang/ClangHost.h
+++ source/Plugins/ExpressionParser/Clang/ClangHost.h
@@ -13,9 +13,9 @@
 
 class FileSpec;
 
-#if defined(__APPLE__)
-bool ComputeClangDirectory(FileSpec &lldb_shlib_spec, FileSpec &file_spec,
-                           bool verify);
+#if !defined(_WIN32)
+bool ComputeClangResourceDirectory(FileSpec &lldb_shlib_spec,
+                                   FileSpec &file_spec, bool verify);
 #endif
 
 FileSpec GetClangResourceDir();
Index: source/Plugins/ExpressionParser/Clang/ClangHost.cpp
===================================================================
--- source/Plugins/ExpressionParser/Clang/ClangHost.cpp
+++ source/Plugins/ExpressionParser/Clang/ClangHost.cpp
@@ -29,17 +29,8 @@
 using namespace lldb_private;
 
 #if defined(_WIN32)
-static bool ComputeClangDirectory(FileSpec &file_spec) { return false; }
+static bool ComputeClangResourceDirectory(FileSpec &file_spec) { return false; }
 #else
-static bool DefaultComputeClangDirectory(FileSpec &file_spec) {
-  return HostInfoPosix::ComputePathRelativeToLibrary(
-      file_spec, (llvm::Twine("/lib") + CLANG_LIBDIR_SUFFIX + "/clang/" +
-                  CLANG_VERSION_STRING)
-                     .str());
-}
-
-#if defined(__APPLE__)
-
 static bool VerifyClangPath(const llvm::Twine &clang_path) {
   if (FileSystem::Instance().IsDirectory(clang_path))
     return true;
@@ -51,9 +42,38 @@
   return false;
 }
 
-bool lldb_private::ComputeClangDirectory(FileSpec &lldb_shlib_spec,
+///
+/// This will compute the clang resource directory assuming that clang was
+/// installed with the same prefix as lldb.
+///
+static bool DefaultComputeClangResourceDirectory(FileSpec &lldb_shlib_spec,
                                          FileSpec &file_spec, bool verify) {
   std::string raw_path = lldb_shlib_spec.GetPath();
+  llvm::StringRef parent_dir = llvm::sys::path::parent_path(raw_path);
+
+  llvm::SmallString<256> clang_dir(parent_dir);
+  llvm::SmallString<32> relative_path;
+  llvm::sys::path::append(relative_path,
+                          llvm::Twine("lib") + CLANG_LIBDIR_SUFFIX, "clang",
+                          CLANG_VERSION_STRING);
+
+  llvm::sys::path::append(clang_dir, relative_path);
+  if (!verify || VerifyClangPath(clang_dir)) {
+    file_spec.GetDirectory().SetString(clang_dir);
+    FileSystem::Instance().Resolve(file_spec);
+    return true;
+  }
+
+  return HostInfoPosix::ComputePathRelativeToLibrary(file_spec, relative_path);
+}
+
+bool lldb_private::ComputeClangResourceDirectory(FileSpec &lldb_shlib_spec,
+                                         FileSpec &file_spec, bool verify) {
+#if !defined(__APPLE__)
+  return DefaultComputeClangResourceDirectory(lldb_shlib_spec, file_spec,
+                                              verify);
+#else
+  std::string raw_path = lldb_shlib_spec.GetPath();
 
   auto rev_it = llvm::sys::path::rbegin(raw_path);
   auto r_end = llvm::sys::path::rend(raw_path);
@@ -65,8 +85,10 @@
     ++rev_it;
   }
 
+  // Posix-style of LLDB detected.
   if (rev_it == r_end)
-    return DefaultComputeClangDirectory(file_spec);
+    return DefaultComputeClangResourceDirectory(lldb_shlib_spec, file_spec,
+                                                verify);
 
   // Inside Xcode and in Xcode toolchains LLDB is always in lockstep
   // with the Swift compiler, so it can reuse its Clang resource
@@ -114,27 +136,17 @@
   file_spec.SetFile(raw_path.c_str(), FileSpec::Style::native);
   FileSystem::Instance().Resolve(file_spec);
   return true;
-}
-
-static bool ComputeClangDirectory(FileSpec &file_spec) {
-  if (FileSpec lldb_file_spec = HostInfo::GetShlibDir())
-    return ComputeClangDirectory(lldb_file_spec, file_spec, true);
-  return false;
-}
-#else  // __APPLE__
-
-// All non-Apple posix systems.
-static bool ComputeClangDirectory(FileSpec &file_spec) {
-  return DefaultComputeClangDirectory(file_spec);
-}
 #endif // __APPLE__
+}
 #endif // _WIN32
 
 FileSpec lldb_private::GetClangResourceDir() {
   static FileSpec g_cached_resource_dir;
   static llvm::once_flag g_once_flag;
   llvm::call_once(g_once_flag, []() {
-    ::ComputeClangDirectory(g_cached_resource_dir);
+    if (FileSpec lldb_file_spec = HostInfo::GetShlibDir())
+      ComputeClangResourceDirectory(lldb_file_spec, g_cached_resource_dir,
+                                    true);
     Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_HOST);
     if (log)
       log->Printf("GetClangResourceDir() => '%s'",
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