Revert r198819 - "Remove dead code."

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198854 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/IR/Module.h

@@ -142,6 +142,12 @@ public:
   /// The named metadata constant interators.
   typedef NamedMDListType::const_iterator const_named_metadata_iterator;
 
+  /// An enumeration for describing the endianess of the target machine.
+  enum Endianness { LittleEndian, BigEndian };
+
+  /// An enumeration for describing the size of a pointer on the target machine.
+  enum PointerSize { Pointer32, Pointer64 };
+
   /// This enumeration defines the supported behaviors of module flags.
   enum ModFlagBehavior {
     /// Emits an error if two values disagree, otherwise the resulting value is
@@ -230,6 +236,14 @@ public:
   /// @returns a string containing the target triple.
   const std::string &getTargetTriple() const { return TargetTriple; }
 
+  /// Get the target endian information.
+  /// @returns Endianess - an enumeration for the endianess of the target
+  Endianness getEndianness() const;
+
+  /// Get the target pointer size.
+  /// @returns PointerSize - an enumeration for the size of the target's pointer
+  PointerSize getPointerSize() const;
+
   /// Get the global data context.
   /// @returns LLVMContext - a container for LLVM's global information
   LLVMContext &getContext() const { return Context; }

lib/IR/Module.cpp

@@ -60,6 +60,51 @@ Module::~Module() {
   delete static_cast<StringMap<NamedMDNode *> *>(NamedMDSymTab);
 }
 
+/// Target endian information.
+Module::Endianness Module::getEndianness() const {
+  StringRef temp = DataLayout;
+  Module::Endianness ret = BigEndian;
+
+  while (!temp.empty()) {
+    std::pair<StringRef, StringRef> P = getToken(temp, "-");
+
+    StringRef token = P.first;
+    temp = P.second;
+
+    if (token[0] == 'e') {
+      ret = LittleEndian;
+    } else if (token[0] == 'E') {
+      ret = BigEndian;
+    }
+  }
+
+  return ret;
+}
+
+/// Target Pointer Size information.
+Module::PointerSize Module::getPointerSize() const {
+  StringRef temp = DataLayout;
+  Module::PointerSize ret = Pointer64;
+
+  while (!temp.empty()) {
+    std::pair<StringRef, StringRef> TmpP = getToken(temp, "-");
+    temp = TmpP.second;
+    TmpP = getToken(TmpP.first, ":");
+    StringRef token = TmpP.second, signalToken = TmpP.first;
+
+    if (signalToken[0] == 'p') {
+      int size = 0;
+      getToken(token, ":").first.getAsInteger(10, size);
+      if (size == 32)
+        ret = Pointer32;
+      else if (size == 64)
+        ret = Pointer64;
+    }
+  }
+
+  return ret;
+}
+
 /// getNamedValue - Return the first global value in the module with
 /// the specified name, of arbitrary type.  This method returns null
 /// if a global with the specified name is not found.