From a1ea4ccc06694c7f4242be84ca54f39503e368da Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Wed, 18 Jun 2014 18:55:41 +0000
Subject: [PATCH] Remove BitcodeReader::setBufferOwned.

We do have use cases for the bitcode reader owning the buffer or not, but we
always know which one we have when we construct it.

It might be possible to simplify this further, but this is a step in the
right direction.

llvm-svn: 211205
---
 llvm/include/llvm/Bitcode/ReaderWriter.h  |  3 ++-
 llvm/lib/Bitcode/Reader/BitcodeReader.cpp | 18 +++++-------------
 llvm/lib/Bitcode/Reader/BitcodeReader.h   | 14 +++++---------
 3 files changed, 12 insertions(+), 23 deletions(-)

diff --git a/llvm/include/llvm/Bitcode/ReaderWriter.h b/llvm/include/llvm/Bitcode/ReaderWriter.h
index 4c194a6..0d0d6a7 100644
--- a/llvm/include/llvm/Bitcode/ReaderWriter.h
+++ b/llvm/include/llvm/Bitcode/ReaderWriter.h
@@ -30,7 +30,8 @@ namespace llvm {
   /// deserialization of function bodies.  If successful, this takes ownership
   /// of 'buffer. On error, this *does not* take ownership of Buffer.
   ErrorOr<Module *> getLazyBitcodeModule(MemoryBuffer *Buffer,
-                                         LLVMContext &Context);
+                                         LLVMContext &Context,
+                                         bool BufferOwned = true);
 
   /// getStreamedBitcodeModule - Read the header of the specified stream
   /// and prepare for lazy deserialization and streaming of function bodies.
diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index c13eba7..04fc18e 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -3374,16 +3374,15 @@ const std::error_category &BitcodeReader::BitcodeErrorCategory() {
 /// getLazyBitcodeModule - lazy function-at-a-time loading from a file.
 ///
 ErrorOr<Module *> llvm::getLazyBitcodeModule(MemoryBuffer *Buffer,
-                                             LLVMContext &Context) {
+                                             LLVMContext &Context,
+                                             bool BufferOwned) {
   Module *M = new Module(Buffer->getBufferIdentifier(), Context);
-  BitcodeReader *R = new BitcodeReader(Buffer, Context);
+  BitcodeReader *R = new BitcodeReader(Buffer, Context, BufferOwned);
   M->setMaterializer(R);
   if (std::error_code EC = R->ParseBitcodeInto(M)) {
     delete M;  // Also deletes R.
     return EC;
   }
-  // Have the BitcodeReader dtor delete 'Buffer'.
-  R->setBufferOwned(true);
 
   R->materializeForwardReferencedFunctions();
 
@@ -3404,21 +3403,16 @@ Module *llvm::getStreamedBitcodeModule(const std::string &name,
     delete M;  // Also deletes R.
     return nullptr;
   }
-  R->setBufferOwned(false); // no buffer to delete
   return M;
 }
 
 ErrorOr<Module *> llvm::parseBitcodeFile(MemoryBuffer *Buffer,
                                          LLVMContext &Context) {
-  ErrorOr<Module *> ModuleOrErr = getLazyBitcodeModule(Buffer, Context);
+  ErrorOr<Module *> ModuleOrErr = getLazyBitcodeModule(Buffer, Context, false);
   if (!ModuleOrErr)
     return ModuleOrErr;
   Module *M = ModuleOrErr.get();
 
-  // Don't let the BitcodeReader dtor delete 'Buffer', regardless of whether
-  // there was an error.
-  static_cast<BitcodeReader*>(M->getMaterializer())->setBufferOwned(false);
-
   // Read in the entire module, and destroy the BitcodeReader.
   if (std::error_code EC = M->materializeAllPermanently()) {
     delete M;
@@ -3434,9 +3428,7 @@ ErrorOr<Module *> llvm::parseBitcodeFile(MemoryBuffer *Buffer,
 std::string llvm::getBitcodeTargetTriple(MemoryBuffer *Buffer,
                                          LLVMContext& Context,
                                          std::string *ErrMsg) {
-  BitcodeReader *R = new BitcodeReader(Buffer, Context);
-  // Don't let the BitcodeReader dtor delete 'Buffer'.
-  R->setBufferOwned(false);
+  BitcodeReader *R = new BitcodeReader(Buffer, Context, /*BufferOwned*/ false);
 
   std::string Triple("");
   if (std::error_code EC = R->ParseTriple(Triple))
diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.h b/llvm/lib/Bitcode/Reader/BitcodeReader.h
index cb0ce32..51a8c6a 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.h
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.h
@@ -223,11 +223,11 @@ public:
     return std::error_code(E, BitcodeErrorCategory());
   }
 
-  explicit BitcodeReader(MemoryBuffer *buffer, LLVMContext &C)
-      : Context(C), TheModule(nullptr), Buffer(buffer), BufferOwned(false),
-        LazyStreamer(nullptr), NextUnreadBit(0), SeenValueSymbolTable(false),
-        ValueList(C), MDValueList(C), SeenFirstFunctionBody(false),
-        UseRelativeIDs(false) {}
+  explicit BitcodeReader(MemoryBuffer *buffer, LLVMContext &C, bool BufferOwned)
+      : Context(C), TheModule(nullptr), Buffer(buffer),
+        BufferOwned(BufferOwned), LazyStreamer(nullptr), NextUnreadBit(0),
+        SeenValueSymbolTable(false), ValueList(C), MDValueList(C),
+        SeenFirstFunctionBody(false), UseRelativeIDs(false) {}
   explicit BitcodeReader(DataStreamer *streamer, LLVMContext &C)
       : Context(C), TheModule(nullptr), Buffer(nullptr), BufferOwned(false),
         LazyStreamer(streamer), NextUnreadBit(0), SeenValueSymbolTable(false),
@@ -239,10 +239,6 @@ public:
 
   void FreeState();
 
-  /// setBufferOwned - If this is true, the reader will destroy the MemoryBuffer
-  /// when the reader is destroyed.
-  void setBufferOwned(bool Owned) { BufferOwned = Owned; }
-
   bool isMaterializable(const GlobalValue *GV) const override;
   bool isDematerializable(const GlobalValue *GV) const override;
   std::error_code Materialize(GlobalValue *GV) override;
-- 
2.7.4