Remove many superfluous SmallString::str() calls.

Now that SmallString is a first-class citizen, most SmallString::str()
calls are not required. This patch removes a whole bunch of them, yet
there are lots more.

There are two use cases where str() is really needed:
1) To use one of StringRef member functions which is not available in
SmallString.
2) To convert to std::string, as StringRef implicitly converts while 
SmallString do not. We may wish to change this, but it may introduce
ambiguity.

llvm-svn: 232622

include/llvm/Support/FileUtilities.h

@@ -51,7 +51,7 @@ namespace llvm {
     ~FileRemover() {
       if (DeleteIt) {
         // Ignore problems deleting the file.
-        sys::fs::remove(Filename.str());
+        sys::fs::remove(Filename);
       }
     }
 
@@ -61,7 +61,7 @@ namespace llvm {
     void setFile(const Twine& filename, bool deleteIt = true) {
       if (DeleteIt) {
         // Ignore problems deleting the file.
-        sys::fs::remove(Filename.str());
+        sys::fs::remove(Filename);
       }
 
       Filename.clear();

lib/MC/MCAsmStreamer.cpp

@@ -267,7 +267,7 @@ void MCAsmStreamer::EmitCommentsAndEOL() {
   }
 
   CommentStream.flush();
-  StringRef Comments = CommentToEmit.str();
+  StringRef Comments = CommentToEmit;
 
   assert(Comments.back() == '\n' &&
          "Comment array not newline terminated");

lib/MC/MCAssembler.cpp

@@ -789,7 +789,7 @@ static void writeFragment(const MCAssembler &Asm, const MCAsmLayout &Layout,
 
   case MCFragment::FT_LEB: {
     const MCLEBFragment &LF = cast<MCLEBFragment>(F);
-    OW->WriteBytes(LF.getContents().str());
+    OW->WriteBytes(LF.getContents());
     break;
   }
 
@@ -805,12 +805,12 @@ static void writeFragment(const MCAssembler &Asm, const MCAsmLayout &Layout,
 
   case MCFragment::FT_Dwarf: {
     const MCDwarfLineAddrFragment &OF = cast<MCDwarfLineAddrFragment>(F);
-    OW->WriteBytes(OF.getContents().str());
+    OW->WriteBytes(OF.getContents());
     break;
   }
   case MCFragment::FT_DwarfFrame: {
     const MCDwarfCallFrameFragment &CF = cast<MCDwarfCallFrameFragment>(F);
-    OW->WriteBytes(CF.getContents().str());
+    OW->WriteBytes(CF.getContents());
     break;
   }
   }

lib/MC/MCDwarf.cpp

@@ -1293,7 +1293,7 @@ const MCSymbol &FrameEmitterImpl::EmitCIE(MCObjectStreamer &streamer,
     Augmentation += "R";
     if (IsSignalFrame)
       Augmentation += "S";
-    streamer.EmitBytes(Augmentation.str());
+    streamer.EmitBytes(Augmentation);
   }
   streamer.EmitIntValue(0, 1);
 

lib/Support/APInt.cpp

@@ -2297,7 +2297,7 @@ void APInt::dump() const {
 void APInt::print(raw_ostream &OS, bool isSigned) const {
   SmallString<40> S;
   this->toString(S, 10, isSigned, /* formatAsCLiteral = */false);
-  OS << S.str();
+  OS << S;
 }
 
 // This implements a variety of operations on a representation of

lib/Support/LockFileManager.cpp

@@ -91,7 +91,7 @@ LockFileManager::LockFileManager(StringRef FileName)
   UniqueLockFileName += "-%%%%%%%%";
   int UniqueLockFileID;
   if (std::error_code EC = sys::fs::createUniqueFile(
-          UniqueLockFileName.str(), UniqueLockFileID, UniqueLockFileName)) {
+          UniqueLockFileName, UniqueLockFileID, UniqueLockFileName)) {
     Error = EC;
     return;
   }
@@ -116,7 +116,7 @@ LockFileManager::LockFileManager(StringRef FileName)
       // We failed to write out PID, so make up an excuse, remove the
       // unique lock file, and fail.
       Error = make_error_code(errc::no_space_on_device);
-      sys::fs::remove(UniqueLockFileName.c_str());
+      sys::fs::remove(UniqueLockFileName);
       return;
     }
   }
@@ -124,7 +124,7 @@ LockFileManager::LockFileManager(StringRef FileName)
   while (1) {
     // Create a link from the lock file name. If this succeeds, we're done.
     std::error_code EC =
-        sys::fs::create_link(UniqueLockFileName.str(), LockFileName.str());
+        sys::fs::create_link(UniqueLockFileName, LockFileName);
     if (!EC)
       return;
 
@@ -137,11 +137,11 @@ LockFileManager::LockFileManager(StringRef FileName)
     // from the lock file.
     if ((Owner = readLockFile(LockFileName))) {
       // Wipe out our unique lock file (it's useless now)
-      sys::fs::remove(UniqueLockFileName.str());
+      sys::fs::remove(UniqueLockFileName);
       return;
     }
 
-    if (!sys::fs::exists(LockFileName.str())) {
+    if (!sys::fs::exists(LockFileName)) {
       // The previous owner released the lock file before we could read it.
       // Try to get ownership again.
       continue;
@@ -149,7 +149,7 @@ LockFileManager::LockFileManager(StringRef FileName)
 
     // There is a lock file that nobody owns; try to clean it up and get
     // ownership.
-    if ((EC = sys::fs::remove(LockFileName.str()))) {
+    if ((EC = sys::fs::remove(LockFileName))) {
       Error = EC;
       return;
     }
@@ -171,8 +171,8 @@ LockFileManager::~LockFileManager() {
     return;
 
   // Since we own the lock, remove the lock file and our own unique lock file.
-  sys::fs::remove(LockFileName.str());
-  sys::fs::remove(UniqueLockFileName.str());
+  sys::fs::remove(LockFileName);
+  sys::fs::remove(UniqueLockFileName);
 }
 
 LockFileManager::WaitForUnlockResult LockFileManager::waitForUnlock() {
@@ -203,7 +203,7 @@ LockFileManager::WaitForUnlockResult LockFileManager::waitForUnlock() {
     if (sys::fs::access(LockFileName.c_str(), sys::fs::AccessMode::Exist) ==
         errc::no_such_file_or_directory) {
       // If the original file wasn't created, somone thought the lock was dead.
-      if (!sys::fs::exists(FileName.str()))
+      if (!sys::fs::exists(FileName))
         return Res_OwnerDied;
       return Res_Success;
     }
@@ -236,5 +236,5 @@ LockFileManager::WaitForUnlockResult LockFileManager::waitForUnlock() {
 }
 
 std::error_code LockFileManager::unsafeRemoveLockFile() {
-  return sys::fs::remove(LockFileName.str());
+  return sys::fs::remove(LockFileName);
 }

lib/Support/Triple.cpp

@@ -850,7 +850,7 @@ void Triple::setArchName(StringRef Str) {
   Triple += getVendorName();
   Triple += "-";
   Triple += getOSAndEnvironmentName();
-  setTriple(Triple.str());
+  setTriple(Triple);
 }
 
 void Triple::setVendorName(StringRef Str) {

lib/Support/Windows/Path.inc

@@ -599,8 +599,8 @@ std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
 
   it.IterationHandle = intptr_t(FindHandle.take());
   SmallString<128> directory_entry_path(path);
-  path::append(directory_entry_path, directory_entry_name_utf8.str());
-  it.CurrentEntry = directory_entry(directory_entry_path.str());
+  path::append(directory_entry_path, directory_entry_name_utf8);
+  it.CurrentEntry = directory_entry(directory_entry_path);
 
   return std::error_code();
 }

utils/TableGen/FixedLenDecoderEmitter.cpp

@@ -1091,7 +1091,7 @@ unsigned FilterChooser::getDecoderIndex(DecoderSet &Decoders,
   // overkill for now, though.
 
   // Make sure the predicate is in the table.
-  Decoders.insert(Decoder.str());
+  Decoders.insert(StringRef(Decoder));
   // Now figure out the index for when we write out the table.
   DecoderSet::const_iterator P = std::find(Decoders.begin(),
                                            Decoders.end(),