From 222e2a7620e6520ffaf4fc4e69d79c18da31542e Mon Sep 17 00:00:00 2001
From: "Zancanaro; Carlo" <czan8762@plang3.cs.usyd.edu.au>
Date: Mon, 24 Sep 2012 09:58:17 +1000
Subject: Add the clang library to the repo (with some of my changes, too).

---
 clang/lib/Serialization/GeneratePCH.cpp | 69 +++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 clang/lib/Serialization/GeneratePCH.cpp

(limited to 'clang/lib/Serialization/GeneratePCH.cpp')

diff --git a/clang/lib/Serialization/GeneratePCH.cpp b/clang/lib/Serialization/GeneratePCH.cpp
new file mode 100644
index 0000000..02aed10
--- /dev/null
+++ b/clang/lib/Serialization/GeneratePCH.cpp
@@ -0,0 +1,69 @@
+//===--- GeneratePCH.cpp - Sema 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 PCHGenerator, which as a SemaConsumer that generates
+//  a PCH file.
+//
+//===----------------------------------------------------------------------===//
+
+#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 "clang/Basic/FileSystemStatCache.h"
+#include "llvm/Bitcode/BitstreamWriter.h"
+#include "llvm/Support/raw_ostream.h"
+#include <string>
+
+using namespace clang;
+
+PCHGenerator::PCHGenerator(const Preprocessor &PP,
+                           StringRef OutputFile,
+                           clang::Module *Module,
+                           StringRef isysroot,
+                           raw_ostream *OS)
+  : PP(PP), OutputFile(OutputFile), Module(Module), 
+    isysroot(isysroot.str()), 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();
+  PP.getFileManager().addStatCache(StatCalls, /*AtBeginning=*/false);
+}
+
+PCHGenerator::~PCHGenerator() {
+}
+
+void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) {
+  if (PP.getDiagnostics().hasErrorOccurred())
+    return;
+  
+  // Emit the PCH file
+  assert(SemaPtr && "No Sema?");
+  Writer.WriteAST(*SemaPtr, StatCalls, OutputFile, Module, 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();
+}
+
+ASTMutationListener *PCHGenerator::GetASTMutationListener() {
+  return &Writer;
+}
+
+ASTDeserializationListener *PCHGenerator::GetASTDeserializationListener() {
+  return &Writer;
+}
-- 
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