[dsymutil] Remove support for obfuscated bitcode (#85713)

Remove support for obfuscated bitcode in dsymutil and the DWARF linker.
We no longer support bitcode submissions and the obfuscation support has
been removed from the rest of the compiler.

rdar://123863918

Author: JDevlieghere

llvm/docs/CommandGuide/dsymutil.rst

@@ -140,10 +140,6 @@ OPTIONS
  (in bytes) to the linked dSYM. The table is sorted by the output size listing
  the object files with the largest contribution first.
 
-.. option:: --symbol-map <bcsymbolmap>
-
- Update the existing dSYMs inplace using symbol map specified.
-
 .. option:: -s, --symtab
 
  Dumps the symbol table found in *executable* or object file(s) and exits.

llvm/include/llvm/CodeGen/NonRelocatableStringpool.h

@@ -27,10 +27,7 @@ class NonRelocatableStringpool {
   /// order.
   using MapTy = StringMap<DwarfStringPoolEntry, BumpPtrAllocator>;
 
-  NonRelocatableStringpool(
-      std::function<StringRef(StringRef Input)> Translator = nullptr,
-      bool PutEmptyString = false)
-      : Translator(Translator) {
+  NonRelocatableStringpool(bool PutEmptyString = false) {
     if (PutEmptyString)
       getEntry("");
   }
@@ -59,7 +56,6 @@ class NonRelocatableStringpool {
   MapTy Strings;
   uint64_t CurrentEndOffset = 0;
   unsigned NumEntries = 0;
-  std::function<StringRef(StringRef Input)> Translator;
 };
 
 /// Helper for making strong types.

llvm/include/llvm/DWARFLinker/Classic/DWARFStreamer.h

@@ -45,16 +45,13 @@ class DwarfStreamer : public DwarfEmitter {
 public:
   DwarfStreamer(DWARFLinkerBase::OutputFileType OutFileType,
                 raw_pwrite_stream &OutFile,
-                DWARFLinkerBase::TranslatorFuncTy Translator,
                 DWARFLinkerBase::MessageHandlerTy Warning)
-      : OutFile(OutFile), OutFileType(OutFileType), Translator(Translator),
-        WarningHandler(Warning) {}
+      : OutFile(OutFile), OutFileType(OutFileType), WarningHandler(Warning) {}
   virtual ~DwarfStreamer() = default;
 
   static Expected<std::unique_ptr<DwarfStreamer>> createStreamer(
       const Triple &TheTriple, DWARFLinkerBase::OutputFileType FileType,
-      raw_pwrite_stream &OutFile, DWARFLinkerBase::TranslatorFuncTy Translator,
-      DWARFLinkerBase::MessageHandlerTy Warning);
+      raw_pwrite_stream &OutFile, DWARFLinkerBase::MessageHandlerTy Warning);
 
   Error init(Triple TheTriple, StringRef Swift5ReflectionSegmentName);
 
@@ -295,7 +292,6 @@ class DwarfStreamer : public DwarfEmitter {
   /// The output file we stream the linked Dwarf to.
   raw_pwrite_stream &OutFile;
   DWARFLinker::OutputFileType OutFileType = DWARFLinker::OutputFileType::Object;
-  std::function<StringRef(StringRef Input)> Translator;
 
   uint64_t RangesSectionSize = 0;
   uint64_t RngListsSectionSize = 0;

llvm/include/llvm/DWARFLinker/DWARFLinkerBase.h

@@ -82,7 +82,6 @@ class DWARFLinkerBase {
       std::function<void(const DWARFFile &File, llvm::StringRef Output)>;
   using ObjectPrefixMapTy = std::map<std::string, std::string>;
   using CompileUnitHandlerTy = function_ref<void(const DWARFUnit &Unit)>;
-  using TranslatorFuncTy = std::function<StringRef(StringRef)>;
   using SwiftInterfacesMapTy = std::map<std::string, std::string>;
   /// Type of output file.
   enum class OutputFileType : uint8_t {

llvm/include/llvm/DWARFLinker/Parallel/DWARFLinker.h

@@ -123,8 +123,7 @@ class DWARFLinker : public DWARFLinkerBase {
 
   /// Creates dwarf linker instance.
   static std::unique_ptr<DWARFLinker>
-  createLinker(MessageHandlerTy ErrorHandler, MessageHandlerTy WarningHandler,
-               TranslatorFuncTy StringsTranslator = nullptr);
+  createLinker(MessageHandlerTy ErrorHandler, MessageHandlerTy WarningHandler);
 
   /// Set output DWARF handler. Result of linking DWARF is set of sections
   /// containing final debug info. DWARFLinkerBase::link() pass generated

llvm/lib/CodeGen/NonRelocatableStringpool.cpp

@@ -12,8 +12,6 @@
 namespace llvm {
 
 DwarfStringPoolEntryRef NonRelocatableStringpool::getEntry(StringRef S) {
-  if (Translator)
-    S = Translator(S);
   auto I = Strings.insert({S, DwarfStringPoolEntry()});
   auto &Entry = I.first->second;
   if (I.second || !Entry.isIndexed()) {
@@ -28,9 +26,6 @@ DwarfStringPoolEntryRef NonRelocatableStringpool::getEntry(StringRef S) {
 StringRef NonRelocatableStringpool::internString(StringRef S) {
   DwarfStringPoolEntry Entry{nullptr, 0, DwarfStringPoolEntry::NotIndexed};
 
-  if (Translator)
-    S = Translator(S);
-
   auto InsertResult = Strings.insert({S, Entry});
   return InsertResult.first->getKey();
 }

llvm/lib/DWARFLinker/Classic/DWARFLinker.cpp

@@ -2701,8 +2701,8 @@ Error DWARFLinker::link() {
   // This Dwarf string pool which is used for emission. It must be used
   // serially as the order of calling getStringOffset matters for
   // reproducibility.
-  OffsetsStringPool DebugStrPool(StringsTranslator, true);
-  OffsetsStringPool DebugLineStrPool(StringsTranslator, false);
+  OffsetsStringPool DebugStrPool(true);
+  OffsetsStringPool DebugLineStrPool(false);
   DebugDieValuePool StringOffsetPool;
 
   // ODR Contexts for the optimize.

llvm/lib/DWARFLinker/Classic/DWARFStreamer.cpp

@@ -32,10 +32,9 @@ using namespace dwarf_linker::classic;
 
 Expected<std::unique_ptr<DwarfStreamer>> DwarfStreamer::createStreamer(
     const Triple &TheTriple, DWARFLinkerBase::OutputFileType FileType,
-    raw_pwrite_stream &OutFile, DWARFLinkerBase::TranslatorFuncTy Translator,
-    DWARFLinkerBase::MessageHandlerTy Warning) {
+    raw_pwrite_stream &OutFile, DWARFLinkerBase::MessageHandlerTy Warning) {
   std::unique_ptr<DwarfStreamer> Streamer =
-      std::make_unique<DwarfStreamer>(FileType, OutFile, Translator, Warning);
+      std::make_unique<DwarfStreamer>(FileType, OutFile, Warning);
   if (Error Err = Streamer->init(TheTriple, "__DWARF"))
     return std::move(Err);
 
@@ -977,11 +976,10 @@ void DwarfStreamer::emitLineTableString(const DWARFDebugLine::Prologue &P,
 
   switch (String.getForm()) {
   case dwarf::DW_FORM_string: {
-    StringRef TranslatedString =
-        (Translator) ? Translator(*StringVal) : *StringVal;
-    Asm->OutStreamer->emitBytes(TranslatedString.data());
+    StringRef Str = *StringVal;
+    Asm->OutStreamer->emitBytes(Str.data());
     Asm->emitInt8(0);
-    LineSectionSize += TranslatedString.size() + 1;
+    LineSectionSize += Str.size() + 1;
   } break;
   case dwarf::DW_FORM_strp:
   case dwarf::DW_FORM_line_strp: {

llvm/lib/DWARFLinker/Parallel/DWARFLinker.cpp

@@ -15,8 +15,6 @@ using namespace dwarf_linker::parallel;
 
 std::unique_ptr<DWARFLinker>
 DWARFLinker::createLinker(MessageHandlerTy ErrorHandler,
-                          MessageHandlerTy WarningHandler,
-                          TranslatorFuncTy StringsTranslator) {
-  return std::make_unique<DWARFLinkerImpl>(ErrorHandler, WarningHandler,
-                                           StringsTranslator);
+                          MessageHandlerTy WarningHandler) {
+  return std::make_unique<DWARFLinkerImpl>(ErrorHandler, WarningHandler);
 }

llvm/lib/DWARFLinker/Parallel/DWARFLinkerGlobalData.h

@@ -21,7 +21,6 @@ class DWARFDie;
 namespace dwarf_linker {
 namespace parallel {
 
-using TranslatorFuncTy = std::function<StringRef(StringRef)>;
 using MessageHandlerTy = std::function<void(
     const Twine &Warning, StringRef Context, const DWARFDie *DIE)>;
 
@@ -95,19 +94,6 @@ class LinkingGlobalData {
   /// Returns global string pool.
   StringPool &getStringPool() { return Strings; }
 
-  /// Set translation function.
-  void setTranslator(TranslatorFuncTy Translator) {
-    this->Translator = Translator;
-  }
-
-  /// Translate specified string.
-  StringRef translateString(StringRef String) {
-    if (Translator)
-      return Translator(String);
-
-    return String;
-  }
-
   /// Returns linking options.
   const DWARFLinkerOptions &getOptions() const { return Options; }
 
@@ -161,7 +147,6 @@ class LinkingGlobalData {
 protected:
   llvm::parallel::PerThreadBumpPtrAllocator Allocator;
   StringPool Strings;
-  TranslatorFuncTy Translator;
   DWARFLinkerOptions Options;
   MessageHandlerTy WarningHandler;
   MessageHandlerTy ErrorHandler;

llvm/lib/DWARFLinker/Parallel/DWARFLinkerImpl.cpp

@@ -20,11 +20,9 @@ using namespace dwarf_linker;
 using namespace dwarf_linker::parallel;
 
 DWARFLinkerImpl::DWARFLinkerImpl(MessageHandlerTy ErrorHandler,
-                                 MessageHandlerTy WarningHandler,
-                                 TranslatorFuncTy StringsTranslator)
+                                 MessageHandlerTy WarningHandler)
     : UniqueUnitID(0), DebugStrStrings(GlobalData),
       DebugLineStrStrings(GlobalData), CommonSections(GlobalData) {
-  GlobalData.setTranslator(StringsTranslator);
   GlobalData.setErrorHandler(ErrorHandler);
   GlobalData.setWarningHandler(WarningHandler);
 }

llvm/lib/DWARFLinker/Parallel/DWARFLinkerImpl.h

@@ -26,8 +26,7 @@ namespace parallel {
 class DWARFLinkerImpl : public DWARFLinker {
 public:
   DWARFLinkerImpl(MessageHandlerTy ErrorHandler,
-                  MessageHandlerTy WarningHandler,
-                  TranslatorFuncTy StringsTranslator);
+                  MessageHandlerTy WarningHandler);
 
   /// Add object file to be linked. Pre-load compile unit die. Call
   /// \p OnCUDieLoaded for each compile unit die. If specified \p File

llvm/lib/DWARFLinker/Parallel/OutputSections.h

@@ -253,7 +253,7 @@ struct SectionDescriptor : SectionDescriptorBase {
 
   /// Emit specified inplace string value into the current section contents.
   void emitInplaceString(StringRef String) {
-    OS << GlobalData.translateString(String);
+    OS << String;
     emitIntVal(0, 1);
   }
 

llvm/lib/DWARFLinker/Parallel/StringEntryToDwarfStringPoolEntryMap.h

@@ -33,7 +33,7 @@ class StringEntryToDwarfStringPoolEntryMap {
       DwarfStringPoolEntryWithExtString *DataPtr =
           GlobalData.getAllocator()
               .Allocate<DwarfStringPoolEntryWithExtString>();
-      DataPtr->String = GlobalData.translateString(String->getKey());
+      DataPtr->String = String->getKey();
       DataPtr->Index = DwarfStringPoolEntry::NotIndexed;
       DataPtr->Offset = 0;
       DataPtr->Symbol = nullptr;