Import Clang, at r72732.

1 files changed, 78 insertions, 0 deletions

diff --git a/lib/Frontend/GeneratePCH.cpp b/lib/Frontend/GeneratePCH.cpp
new file mode 100644
index 0000000..8be88ce
--- /dev/null
+++ b/lib/Frontend/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/ASTConsumers.h"
+#include "clang/Frontend/PCHWriter.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/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 SemaConsumer {
+    const Preprocessor &PP;
+    llvm::raw_ostream *Out;
+    Sema *SemaPtr;
+    MemorizeStatCalls *StatCalls; // owned by the FileManager
+
+  public:
+    explicit PCHGenerator(const Preprocessor &PP, llvm::raw_ostream *Out);
+    virtual void InitializeSema(Sema &S) { SemaPtr = &S; }
+    virtual void HandleTranslationUnit(ASTContext &Ctx);
+  };
+}
+
+PCHGenerator::PCHGenerator(const Preprocessor &PP, llvm::raw_ostream *OS)
+  : PP(PP), Out(OS), SemaPtr(0), StatCalls(0) { 
+
+  // Install a stat() listener to keep track of all of the stat()
+  // calls.
+  StatCalls = new MemorizeStatCalls;
+  PP.getFileManager().setStatCache(StatCalls);
+}
+
+void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) {
+  if (PP.getDiagnostics().hasErrorOccurred())
+    return;
+
+ // Write the PCH contents into a buffer
+  std::vector<unsigned char> Buffer;
+  BitstreamWriter Stream(Buffer);
+  PCHWriter Writer(Stream);
+
+  // Emit the PCH file
+  assert(SemaPtr && "No Sema?");
+  Writer.WritePCH(*SemaPtr, StatCalls);
+
+  // Write the generated bitstream to "Out".
+  Out->write((char *)&Buffer.front(), Buffer.size());
+
+  // Make sure it hits disk now.
+  Out->flush();
+}
+
+ASTConsumer *clang::CreatePCHGenerator(const Preprocessor &PP,
+                                       llvm::raw_ostream *OS) {
+  return new PCHGenerator(PP, OS);
+}