Importing netbsd clang -- pristine

Change-Id: Ia40e9ffdf29b5dab2f122f673ff6802a58bc690f

external/bsd/llvm/dist/clang/lib/Serialization/GeneratePCH.cpp

@@ -0,0 +1,73 @@
+//===--- 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/AST/ASTConsumer.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Sema/SemaConsumer.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, bool AllowASTWithErrors)
+  : PP(PP), OutputFile(OutputFile), Module(Module), 
+    isysroot(isysroot.str()), Out(OS), 
+    SemaPtr(0), Stream(Buffer), Writer(Stream),
+    AllowASTWithErrors(AllowASTWithErrors),
+    HasEmittedPCH(false) {
+}
+
+PCHGenerator::~PCHGenerator() {
+}
+
+void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) {
+  // Don't create a PCH if there were fatal failures during module loading.
+  if (PP.getModuleLoader().HadFatalFailure)
+    return;
+
+  bool hasErrors = PP.getDiagnostics().hasErrorOccurred();
+  if (hasErrors && !AllowASTWithErrors)
+    return;
+  
+  // Emit the PCH file
+  assert(SemaPtr && "No Sema?");
+  Writer.WriteAST(*SemaPtr, OutputFile, Module, isysroot, hasErrors);
+
+  // 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();
+
+  HasEmittedPCH = true;
+}
+
+ASTMutationListener *PCHGenerator::GetASTMutationListener() {
+  return &Writer;
+}
+
+ASTDeserializationListener *PCHGenerator::GetASTDeserializationListener() {
+  return &Writer;
+}