From: Nico Weber <nicolasweber@gmx.de>
Date: Tue, 10 Apr 2018 13:36:38 +0000 (+0000)
Subject: Use llvm::sys::fs::real_path() in clang.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=cd5e8f5e55e722b8cf7c957af68f98c6a414094a;p=clang

Use llvm::sys::fs::real_path() in clang.

No expected behavior change.
https://reviews.llvm.org/D45165


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@329698 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Basic/FileManager.cpp b/lib/Basic/FileManager.cpp
index a3e226d6cc..54cd0b0f25 100644
--- a/lib/Basic/FileManager.cpp
+++ b/lib/Basic/FileManager.cpp
@@ -534,23 +534,9 @@ StringRef FileManager::getCanonicalName(const DirectoryEntry *Dir) {
 
   StringRef CanonicalName(Dir->getName());
 
-#ifdef LLVM_ON_UNIX
-  char CanonicalNameBuf[PATH_MAX];
-  if (realpath(Dir->getName().str().c_str(), CanonicalNameBuf))
+  SmallString<PATH_MAX> CanonicalNameBuf;
+  if (!llvm::sys::fs::real_path(Dir->getName(), CanonicalNameBuf))
     CanonicalName = StringRef(CanonicalNameBuf).copy(CanonicalNameStorage);
-#else
-  SmallString<256> CanonicalNameBuf(CanonicalName);
-  llvm::sys::fs::make_absolute(CanonicalNameBuf);
-  llvm::sys::path::native(CanonicalNameBuf);
-  // We've run into needing to remove '..' here in the wild though, so
-  // remove it.
-  // On Windows, symlinks are significantly less prevalent, so removing
-  // '..' is pretty safe.
-  // Ideally we'd have an equivalent of `realpath` and could implement
-  // sys::fs::canonical across all the platforms.
-  llvm::sys::path::remove_dots(CanonicalNameBuf, /* remove_dot_dot */ true);
-  CanonicalName = StringRef(CanonicalNameBuf).copy(CanonicalNameStorage);
-#endif
 
   CanonicalDirNames.insert(std::make_pair(Dir, CanonicalName));
   return CanonicalName;
diff --git a/lib/Frontend/ModuleDependencyCollector.cpp b/lib/Frontend/ModuleDependencyCollector.cpp
index 3546508a89..5fa0e13c77 100644
--- a/lib/Frontend/ModuleDependencyCollector.cpp
+++ b/lib/Frontend/ModuleDependencyCollector.cpp
@@ -97,24 +97,6 @@ struct ModuleDependencyMMCallbacks : public ModuleMapCallbacks {
 
 }
 
-// TODO: move this to Support/Path.h and check for HAVE_REALPATH?
-static bool real_path(StringRef SrcPath, SmallVectorImpl<char> &RealPath) {
-#ifdef LLVM_ON_UNIX
-  char CanonicalPath[PATH_MAX];
-
-  // TODO: emit a warning in case this fails...?
-  if (!realpath(SrcPath.str().c_str(), CanonicalPath))
-    return false;
-
-  SmallString<256> RPath(CanonicalPath);
-  RealPath.swap(RPath);
-  return true;
-#else
-  // FIXME: Add support for systems without realpath.
-  return false;
-#endif
-}
-
 void ModuleDependencyCollector::attachToASTReader(ASTReader &R) {
   R.addListener(llvm::make_unique<ModuleDependencyListener>(*this));
 }
@@ -129,7 +111,7 @@ void ModuleDependencyCollector::attachToPreprocessor(Preprocessor &PP) {
 static bool isCaseSensitivePath(StringRef Path) {
   SmallString<256> TmpDest = Path, UpperDest, RealDest;
   // Remove component traversals, links, etc.
-  if (!real_path(Path, TmpDest))
+  if (llvm::sys::fs::real_path(Path, TmpDest))
     return true; // Current default value in vfs.yaml
   Path = TmpDest;
 
@@ -139,7 +121,7 @@ static bool isCaseSensitivePath(StringRef Path) {
   // already expects when sensitivity isn't setup.
   for (auto &C : Path)
     UpperDest.push_back(toUppercase(C));
-  if (real_path(UpperDest, RealDest) && Path.equals(RealDest))
+  if (!llvm::sys::fs::real_path(UpperDest, RealDest) && Path.equals(RealDest))
     return false;
   return true;
 }
@@ -189,7 +171,7 @@ bool ModuleDependencyCollector::getRealPath(StringRef SrcPath,
   // Computing the real path is expensive, cache the search through the
   // parent path directory.
   if (DirWithSymLink == SymLinkMap.end()) {
-    if (!real_path(Dir, RealPath))
+    if (llvm::sys::fs::real_path(Dir, RealPath))
       return false;
     SymLinkMap[Dir] = RealPath.str();
   } else {