[llvm][support] Move make_absolute from sys::fs to sys::path (#161459)

The `llvm::sys::fs::make_absolute(const Twine &, SmallVectorImpl<char>
&)` functions doesn't perform any FS access - it only modifies the
second parameter via path/string operations. This function should live
in the `llvm::sys::path` namespace for consistency and for making it
easier to spot function calls that perform IO.

bolt/lib/Core/BinaryContext.cpp

@@ -1662,7 +1662,7 @@ void BinaryContext::preprocessDWODebugInfo() {
                "files.\n";
       }
       // Prevent failures when DWOName is already an absolute path.
-      sys::fs::make_absolute(DWOCompDir, AbsolutePath);
+      sys::path::make_absolute(DWOCompDir, AbsolutePath);
       DWARFUnit *DWOCU =
           DwarfUnit->getNonSkeletonUnitDIE(false, AbsolutePath).getDwarfUnit();
       if (!DWOCU->isDWOUnit()) {

bolt/lib/Rewrite/DWARFRewriter.cpp

@@ -1853,7 +1853,7 @@ void DWARFRewriter::writeDWOFiles(
   else if (!sys::fs::exists(CompDir))
     CompDir = ".";
   // Prevent failures when DWOName is already an absolute path.
-  sys::fs::make_absolute(CompDir, AbsolutePath);
+  sys::path::make_absolute(CompDir, AbsolutePath);
 
   std::error_code EC;
   std::unique_ptr<ToolOutputFile> TempOut =

clang-tools-extra/clang-apply-replacements/lib/Tooling/ApplyReplacements.cpp

@@ -142,7 +142,7 @@ groupReplacements(const TUReplacements &TUs, const TUDiagnostics &TUDs,
     // build directories, make them absolute immediately.
     SmallString<128> Path = R.getFilePath();
     if (BuildDir)
-      llvm::sys::fs::make_absolute(*BuildDir, Path);
+      llvm::sys::path::make_absolute(*BuildDir, Path);
     else
       SM.getFileManager().makeAbsolutePath(Path);
 

clang-tools-extra/clang-move/Move.cpp

@@ -75,7 +75,7 @@ std::string MakeAbsolutePath(StringRef CurrentDir, StringRef Path) {
     return "";
   llvm::SmallString<128> InitialDirectory(CurrentDir);
   llvm::SmallString<128> AbsolutePath(Path);
-  llvm::sys::fs::make_absolute(InitialDirectory, AbsolutePath);
+  llvm::sys::path::make_absolute(InitialDirectory, AbsolutePath);
   return CleanPath(std::move(AbsolutePath));
 }
 

clang-tools-extra/clangd/ConfigCompile.cpp

@@ -131,7 +131,7 @@ struct FragmentCompiler {
       return std::nullopt;
     }
     llvm::SmallString<256> AbsPath = llvm::StringRef(*Path);
-    llvm::sys::fs::make_absolute(FragmentDirectory, AbsPath);
+    llvm::sys::path::make_absolute(FragmentDirectory, AbsPath);
     llvm::sys::path::native(AbsPath, Style);
     return AbsPath.str().str();
   }

clang-tools-extra/clangd/SystemIncludeExtractor.cpp

@@ -106,7 +106,7 @@ struct DriverArgs {
     // relative or absolute).
     if (llvm::any_of(Driver,
                      [](char C) { return llvm::sys::path::is_separator(C); })) {
-      llvm::sys::fs::make_absolute(Cmd.Directory, Driver);
+      llvm::sys::path::make_absolute(Cmd.Directory, Driver);
     }
     this->Driver = Driver.str().str();
     for (size_t I = 0, E = Cmd.CommandLine.size(); I < E; ++I) {

clang-tools-extra/clangd/index/SymbolCollector.cpp

@@ -325,7 +325,7 @@ private:
     if (R.second) {
       llvm::SmallString<256> AbsPath = Path;
       if (!llvm::sys::path::is_absolute(AbsPath) && !FallbackDir.empty())
-        llvm::sys::fs::make_absolute(FallbackDir, AbsPath);
+        llvm::sys::path::make_absolute(FallbackDir, AbsPath);
       assert(llvm::sys::path::is_absolute(AbsPath) &&
              "If the VFS can't make paths absolute, a FallbackDir must be "
              "provided");

clang-tools-extra/clangd/tool/ClangdMain.cpp

@@ -578,7 +578,7 @@ public:
     Body = Body.ltrim('/');
     llvm::SmallString<16> Path(Body);
     path::native(Path);
-    fs::make_absolute(TestScheme::TestDir, Path);
+    path::make_absolute(TestScheme::TestDir, Path);
     return std::string(Path);
   }
 

clang-tools-extra/include-cleaner/tool/IncludeCleaner.cpp

@@ -344,7 +344,7 @@ mapInputsToAbsPaths(clang::tooling::CompilationDatabase &CDB,
     }
     for (const auto &Cmd : Cmds) {
       llvm::SmallString<256> CDBPath(Cmd.Filename);
-      llvm::sys::fs::make_absolute(Cmd.Directory, CDBPath);
+      llvm::sys::path::make_absolute(Cmd.Directory, CDBPath);
       CDBToAbsPaths[std::string(CDBPath)] = std::string(AbsPath);
     }
   }

clang/lib/Lex/HeaderSearch.cpp

@@ -2077,7 +2077,7 @@ std::string HeaderSearch::suggestPathToFileForDiagnostics(
 
   llvm::SmallString<32> FilePath = File;
   if (!WorkingDir.empty() && !path::is_absolute(FilePath))
-    fs::make_absolute(WorkingDir, FilePath);
+    path::make_absolute(WorkingDir, FilePath);
   // remove_dots switches to backslashes on windows as a side-effect!
   // We always want to suggest forward slashes for includes.
   // (not remove_dots(..., posix) as that misparses windows paths).
@@ -2091,7 +2091,7 @@ std::string HeaderSearch::suggestPathToFileForDiagnostics(
   // `BestPrefixLength` accordingly.
   auto CheckDir = [&](llvm::SmallString<32> Dir) -> bool {
     if (!WorkingDir.empty() && !path::is_absolute(Dir))
-      fs::make_absolute(WorkingDir, Dir);
+      path::make_absolute(WorkingDir, Dir);
     path::remove_dots(Dir, /*remove_dot_dot=*/true);
     for (auto NI = path::begin(File), NE = path::end(File),
               DI = path::begin(Dir), DE = path::end(Dir);

clang/lib/Tooling/DependencyScanning/DependencyScannerImpl.cpp

@@ -31,7 +31,7 @@ public:
     for (const auto &File : getDependencies()) {
       CanonPath = File;
       llvm::sys::path::remove_dots(CanonPath, /*remove_dot_dot=*/true);
-      llvm::sys::fs::make_absolute(WorkingDirectory, CanonPath);
+      llvm::sys::path::make_absolute(WorkingDirectory, CanonPath);
       C.handleFileDependency(CanonPath);
     }
   }

clang/unittests/Frontend/CompilerInstanceTest.cpp

@@ -33,7 +33,7 @@ TEST(CompilerInstance, DefaultVFSOverlayFromInvocation) {
 
   SmallString<256> CurrentPath;
   sys::fs::current_path(CurrentPath);
-  sys::fs::make_absolute(CurrentPath, FileName);
+  sys::path::make_absolute(CurrentPath, FileName);
 
   // Mount the VFS file itself on the path 'virtual.file'. Makes this test
   // a bit shorter than creating a new dummy file just for this purpose.

llvm/include/llvm/Support/FileSystem.h

@@ -266,18 +266,6 @@ public:
 /// @name Physical Operators
 /// @{
 
-/// Make \a path an absolute path.
-///
-/// Makes \a path absolute using the \a current_directory if it is not already.
-/// An empty \a path will result in the \a current_directory.
-///
-/// /absolute/path   => /absolute/path
-/// relative/../path => <current-directory>/relative/../path
-///
-/// @param path A path that is modified to be an absolute path.
-LLVM_ABI void make_absolute(const Twine &current_directory,
-                            SmallVectorImpl<char> &path);
-
 /// Make \a path an absolute path.
 ///
 /// Makes \a path absolute using the current directory if it is not already. An

llvm/include/llvm/Support/Path.h

@@ -566,6 +566,18 @@ LLVM_ABI bool is_absolute_gnu(const Twine &path, Style style = Style::native);
 /// @result True if the path is relative, false if it is not.
 LLVM_ABI bool is_relative(const Twine &path, Style style = Style::native);
 
+/// Make \a path an absolute path.
+///
+/// Makes \a path absolute using the \a current_directory if it is not already.
+/// An empty \a path will result in the \a current_directory.
+///
+/// /absolute/path   => /absolute/path
+/// relative/../path => <current-directory>/relative/../path
+///
+/// @param path A path that is modified to be an absolute path.
+LLVM_ABI void make_absolute(const Twine &current_directory,
+                            SmallVectorImpl<char> &path);
+
 } // end namespace path
 } // end namespace sys
 } // end namespace llvm

llvm/lib/Support/Path.cpp

@@ -700,6 +700,55 @@ bool is_relative(const Twine &path, Style style) {
   return !is_absolute(path, style);
 }
 
+void make_absolute(const Twine &current_directory,
+                   SmallVectorImpl<char> &path) {
+  StringRef p(path.data(), path.size());
+
+  bool rootDirectory = has_root_directory(p);
+  bool rootName = has_root_name(p);
+
+  // Already absolute.
+  if ((rootName || is_style_posix(Style::native)) && rootDirectory)
+    return;
+
+  // All the following conditions will need the current directory.
+  SmallString<128> current_dir;
+  current_directory.toVector(current_dir);
+
+  // Relative path. Prepend the current directory.
+  if (!rootName && !rootDirectory) {
+    // Append path to the current directory.
+    append(current_dir, p);
+    // Set path to the result.
+    path.swap(current_dir);
+    return;
+  }
+
+  if (!rootName && rootDirectory) {
+    StringRef cdrn = root_name(current_dir);
+    SmallString<128> curDirRootName(cdrn.begin(), cdrn.end());
+    append(curDirRootName, p);
+    // Set path to the result.
+    path.swap(curDirRootName);
+    return;
+  }
+
+  if (rootName && !rootDirectory) {
+    StringRef pRootName = root_name(p);
+    StringRef bRootDirectory = root_directory(current_dir);
+    StringRef bRelativePath = relative_path(current_dir);
+    StringRef pRelativePath = relative_path(p);
+
+    SmallString<128> res;
+    append(res, pRootName, bRootDirectory, bRelativePath, pRelativePath);
+    path.swap(res);
+    return;
+  }
+
+  llvm_unreachable("All rootName and rootDirectory combinations should have "
+                   "occurred above!");
+}
+
 StringRef remove_leading_dotslash(StringRef Path, Style style) {
   // Remove leading "./" (or ".//" or "././" etc.)
   while (Path.size() > 2 && Path[0] == '.' && is_separator(Path[1], style)) {
@@ -903,55 +952,6 @@ getPotentiallyUniqueTempFileName(const Twine &Prefix, StringRef Suffix,
   return createTemporaryFile(Prefix, Suffix, Dummy, ResultPath, FS_Name);
 }
 
-void make_absolute(const Twine &current_directory,
-                   SmallVectorImpl<char> &path) {
-  StringRef p(path.data(), path.size());
-
-  bool rootDirectory = path::has_root_directory(p);
-  bool rootName = path::has_root_name(p);
-
-  // Already absolute.
-  if ((rootName || is_style_posix(Style::native)) && rootDirectory)
-    return;
-
-  // All of the following conditions will need the current directory.
-  SmallString<128> current_dir;
-  current_directory.toVector(current_dir);
-
-  // Relative path. Prepend the current directory.
-  if (!rootName && !rootDirectory) {
-    // Append path to the current directory.
-    path::append(current_dir, p);
-    // Set path to the result.
-    path.swap(current_dir);
-    return;
-  }
-
-  if (!rootName && rootDirectory) {
-    StringRef cdrn = path::root_name(current_dir);
-    SmallString<128> curDirRootName(cdrn.begin(), cdrn.end());
-    path::append(curDirRootName, p);
-    // Set path to the result.
-    path.swap(curDirRootName);
-    return;
-  }
-
-  if (rootName && !rootDirectory) {
-    StringRef pRootName      = path::root_name(p);
-    StringRef bRootDirectory = path::root_directory(current_dir);
-    StringRef bRelativePath  = path::relative_path(current_dir);
-    StringRef pRelativePath  = path::relative_path(p);
-
-    SmallString<128> res;
-    path::append(res, pRootName, bRootDirectory, bRelativePath, pRelativePath);
-    path.swap(res);
-    return;
-  }
-
-  llvm_unreachable("All rootName and rootDirectory combinations should have "
-                   "occurred above!");
-}
-
 std::error_code make_absolute(SmallVectorImpl<char> &path) {
   if (path::is_absolute(path))
     return {};
@@ -960,7 +960,7 @@ std::error_code make_absolute(SmallVectorImpl<char> &path) {
   if (std::error_code ec = current_path(current_dir))
     return ec;
 
-  make_absolute(current_dir, path);
+  path::make_absolute(current_dir, path);
   return {};
 }
 

llvm/lib/Support/VirtualFileSystem.cpp

@@ -133,7 +133,7 @@ std::error_code FileSystem::makeAbsolute(SmallVectorImpl<char> &Path) const {
   if (!WorkingDir)
     return WorkingDir.getError();
 
-  llvm::sys::fs::make_absolute(WorkingDir.get(), Path);
+  sys::path::make_absolute(WorkingDir.get(), Path);
   return {};
 }
 
@@ -300,7 +300,7 @@ private:
     if (!WD || !*WD)
       return Path;
     Path.toVector(Storage);
-    sys::fs::make_absolute(WD->get().Resolved, Storage);
+    sys::path::make_absolute(WD->get().Resolved, Storage);
     return Storage;
   }
 

llvm/tools/llvm-config/llvm-config.cpp

@@ -357,18 +357,18 @@ int main(int argc, char **argv) {
     ActivePrefix = CurrentExecPrefix;
     {
       SmallString<256> Path(LLVM_INSTALL_INCLUDEDIR);
-      sys::fs::make_absolute(ActivePrefix, Path);
+      sys::path::make_absolute(ActivePrefix, Path);
       ActiveIncludeDir = std::string(Path);
     }
     {
       SmallString<256> Path(LLVM_TOOLS_INSTALL_DIR);
-      sys::fs::make_absolute(ActivePrefix, Path);
+      sys::path::make_absolute(ActivePrefix, Path);
       ActiveBinDir = std::string(Path);
     }
     ActiveLibDir = ActivePrefix + "/lib" + LLVM_LIBDIR_SUFFIX;
     {
       SmallString<256> Path(LLVM_INSTALL_PACKAGE_DIR);
-      sys::fs::make_absolute(ActivePrefix, Path);
+      sys::path::make_absolute(ActivePrefix, Path);
       ActiveCMakeDir = std::string(Path);
     }
     ActiveIncludeOption = "-I" + ActiveIncludeDir;

llvm/tools/llvm-dwp/llvm-dwp.cpp

@@ -94,7 +94,7 @@ getDWOFilenames(StringRef ExecFilename) {
         dwarf::toString(Die.find(dwarf::DW_AT_comp_dir), "");
     if (!DWOCompDir.empty()) {
       SmallString<16> DWOPath(DWOName);
-      sys::fs::make_absolute(DWOCompDir, DWOPath);
+      sys::path::make_absolute(DWOCompDir, DWOPath);
       if (!sys::fs::exists(DWOPath) && sys::fs::exists(DWOName))
         DWOPaths.push_back(std::move(DWOName));
       else

llvm/tools/llvm-opt-report/OptReport.cpp

@@ -274,7 +274,7 @@ static bool writeReport(LocationInfoTy &LocationInfo) {
   for (auto &FI : LocationInfo) {
     SmallString<128> FileName(FI.first);
     if (!InputRelDir.empty())
-      sys::fs::make_absolute(InputRelDir, FileName);
+      sys::path::make_absolute(InputRelDir, FileName);
 
     const auto &FileInfo = FI.second;
 

llvm/unittests/Support/Path.cpp

@@ -255,14 +255,14 @@ TEST(Support, Path) {
 
   {
     SmallString<32> Relative("foo.cpp");
-    sys::fs::make_absolute("/root", Relative);
+    path::make_absolute("/root", Relative);
     Relative[5] = '/'; // Fix up windows paths.
     ASSERT_EQ("/root/foo.cpp", Relative);
   }
 
   {
     SmallString<32> Relative("foo.cpp");
-    sys::fs::make_absolute("//root", Relative);
+    path::make_absolute("//root", Relative);
     Relative[6] = '/'; // Fix up windows paths.
     ASSERT_EQ("//root/foo.cpp", Relative);
   }