1 files changed, 78 insertions, 0 deletions
diff --git a/clang/tools/clang-cc/GeneratePCH.cpp b/clang/tools/clang-cc/GeneratePCH.cpp
new file mode 100644
index 00000000000..a2333487188
--- /dev/null
+++ b/clang/tools/clang-cc/GeneratePCH.cpp
@@ -0,0 +1,78 @@
+//===--- GeneratePCH.cpp - AST Consumer for PCH Generation ------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines the CreatePCHGenerate function, which creates an
+//  ASTConsume that generates a PCH file.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/PCHWriter.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/ASTConsumer.h"
+#include "llvm/Bitcode/BitstreamWriter.h"
+#include "llvm/System/Path.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/Streams.h"
+#include <string>
+
+using namespace clang;
+using namespace llvm;
+
+namespace {
+  class VISIBILITY_HIDDEN PCHGenerator : public ASTConsumer {
+    Diagnostic &Diags;
+    std::string OutFile;
+
+  public:
+    explicit PCHGenerator(Diagnostic &Diags, const std::string &OutFile)
+      : Diags(Diags), OutFile(OutFile) { }
+
+    virtual void HandleTranslationUnit(ASTContext &Ctx);
+  };
+}
+
+void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) {
+  if (Diags.hasErrorOccurred())
+    return;
+
+ // Write the PCH contents into a buffer
+  std::vector<unsigned char> Buffer;
+  BitstreamWriter Stream(Buffer);
+  PCHWriter Writer(Stream);
+
+  // Emit the PCH file
+  Writer.WritePCH(Ctx);
+
+  // Open up the PCH file.
+  std::string ErrMsg;
+  llvm::raw_fd_ostream Out(OutFile.c_str(), true, ErrMsg);
+  
+  if (!ErrMsg.empty()) {
+    llvm::errs() << "PCH error: " << ErrMsg << "\n";
+    return;
+  }
+
+  // Write the generated bitstream to "Out".
+  Out.write((char *)&Buffer.front(), Buffer.size());
+
+  // Make sure it hits disk now.
+  Out.flush();
+}
+
+namespace clang {
+
+ASTConsumer *CreatePCHGenerator(Diagnostic &Diags,
+                                const LangOptions &Features,
+                                const std::string& InFile,
+                                const std::string& OutFile) {
+  return new PCHGenerator(Diags, OutFile);
+}
+
+}