Add support for writing LLVM IR to a specified BitstreamWriter.

Patch by Lukasz Janyst!

llvm-svn: 61251

3 files changed, 25 insertions, 12 deletions

diff --git a/llvm/include/llvm/Bitcode/BitstreamWriter.h b/llvm/include/llvm/Bitcode/BitstreamWriter.h
index f76bb88dee8..7fd23fe4166 100644
--- a/llvm/include/llvm/Bitcode/BitstreamWriter.h
+++ b/llvm/include/llvm/Bitcode/BitstreamWriter.h
@@ -76,6 +76,9 @@ public:
       BlockInfoRecords.pop_back();
     }
   }
+
+  std::vector<unsigned char> &getBuffer() { return Out; }
+
   //===--------------------------------------------------------------------===//
   // Basic Primitives for emitting bits to the stream.
   //===--------------------------------------------------------------------===//
diff --git a/llvm/include/llvm/Bitcode/ReaderWriter.h b/llvm/include/llvm/Bitcode/ReaderWriter.h
index f18b4fc090f..7b1e06f6553 100644
--- a/llvm/include/llvm/Bitcode/ReaderWriter.h
+++ b/llvm/include/llvm/Bitcode/ReaderWriter.h
@@ -22,6 +22,7 @@ namespace llvm {
   class ModuleProvider;
   class MemoryBuffer;
   class ModulePass;
+  class BitstreamWriter;
   class raw_ostream;
   
   /// getBitcodeModuleProvider - Read the header of the specified bitcode buffer
@@ -45,6 +46,10 @@ namespace llvm {
   /// raw output stream.
   void WriteBitcodeToFile(const Module *M, raw_ostream &Out);
 
+  /// WriteBitcodeToStream - Write the specified module to the specified
+  /// raw output stream.
+  void WriteBitcodeToStream(const Module *M, BitstreamWriter &Stream);
+
   /// CreateBitcodeWriterPass - Create and return a pass that writes the module
   /// to the specified ostream.
   ModulePass *CreateBitcodeWriterPass(std::ostream &Str);
diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
index adf49a524a3..b98dab70924 100644
--- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -1355,7 +1355,23 @@ void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out) {
   BitstreamWriter Stream(Buffer);
   
   Buffer.reserve(256*1024);
+
+  WriteBitcodeToStream( M, Stream );
+  
+  // If writing to stdout, set binary mode.
+  if (&llvm::outs() == &Out)
+    sys::Program::ChangeStdoutToBinary();
+
+  // Write the generated bitstream to "Out".
+  Out.write((char*)&Buffer.front(), Buffer.size());
   
+  // Make sure it hits disk now.
+  Out.flush();
+}
+
+/// WriteBitcodeToStream - Write the specified module to the specified output
+/// stream.
+void llvm::WriteBitcodeToStream(const Module *M, BitstreamWriter &Stream) {
   // If this is darwin, emit a file header and trailer if needed.
   bool isDarwin = M->getTargetTriple().find("-darwin") != std::string::npos;
   if (isDarwin)
@@ -1373,16 +1389,5 @@ void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out) {
   WriteModule(M, Stream);
 
   if (isDarwin)
-    EmitDarwinBCTrailer(Stream, Buffer.size());
-
-  
-  // If writing to stdout, set binary mode.
-  if (&llvm::outs() == &Out)
-    sys::Program::ChangeStdoutToBinary();
-
-  // Write the generated bitstream to "Out".
-  Out.write((char*)&Buffer.front(), Buffer.size());
-  
-  // Make sure it hits disk now.
-  Out.flush();
+    EmitDarwinBCTrailer(Stream, Stream.getBuffer().size());
 }