1 files changed, 64 insertions, 0 deletions
diff --git a/lib/Serialization/GeneratePCH.cpp b/lib/Serialization/GeneratePCH.cpp
new file mode 100644
index 000000000000..5329b6cbd4d0
--- /dev/null
+++ b/lib/Serialization/GeneratePCH.cpp
@@ -0,0 +1,64 @@
+//===--- 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
+//  ASTConsumer that generates a PCH file.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/ASTConsumers.h"
+#include "clang/Serialization/ASTWriter.h"
+#include "clang/Sema/SemaConsumer.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/ASTConsumer.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Basic/FileManager.h"
+#include "llvm/Bitcode/BitstreamWriter.h"
+#include "llvm/Support/raw_ostream.h"
+#include <string>
+
+using namespace clang;
+
+PCHGenerator::PCHGenerator(const Preprocessor &PP,
+                           bool Chaining,
+                           const char *isysroot,
+                           llvm::raw_ostream *OS)
+  : PP(PP), isysroot(isysroot), Out(OS), SemaPtr(0),
+    StatCalls(0), Stream(Buffer), Writer(Stream) {
+
+  // Install a stat() listener to keep track of all of the stat()
+  // calls.
+  StatCalls = new MemorizeStatCalls;
+  // If we have a chain, we want new stat calls only, so install the memorizer
+  // *after* the already installed ASTReader's stat cache.
+  PP.getFileManager().addStatCache(StatCalls,
+    /*AtBeginning=*/!Chaining);
+}
+
+void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) {
+  if (PP.getDiagnostics().hasErrorOccurred())
+    return;
+
+  // Emit the PCH file
+  assert(SemaPtr && "No Sema?");
+  Writer.WriteAST(*SemaPtr, StatCalls, isysroot);
+
+  // Write the generated bitstream to "Out".
+  Out->write((char *)&Buffer.front(), Buffer.size());
+
+  // Make sure it hits disk now.
+  Out->flush();
+
+  // Free up some memory, in case the process is kept alive.
+  Buffer.clear();
+}
+
+ASTDeserializationListener *PCHGenerator::GetASTDeserializationListener() {
+  return &Writer;
+}