1 files changed, 71 insertions, 0 deletions
diff --git a/lib/IRReader/IRReader.cpp b/lib/IRReader/IRReader.cpp
new file mode 100644
index 0000000000..fe74a9ae51
--- /dev/null
+++ b/lib/IRReader/IRReader.cpp
@@ -0,0 +1,71 @@
+//===- IRReader.cpp - NaCl aware IR readers. ------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/OwningPtr.h"
+#include "llvm/Assembly/Parser.h"
+#include "llvm/Bitcode/NaCl/NaClReaderWriter.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/IRReader/IRReader.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/system_error.h"
+
+using namespace llvm;
+
+// Note: Code below based on ParseIR and ParseIRFile in llvm/Support/IRReader.h
+
+Module *llvm::NaClParseIR(MemoryBuffer *Buffer,
+                          NaClFileFormat Format,
+                          SMDiagnostic &Err,
+                          LLVMContext &Context) {
+  if ((Format == PNaClFormat) &&
+      isNaClBitcode((const unsigned char *)Buffer->getBufferStart(),
+                    (const unsigned char *)Buffer->getBufferEnd())) {
+    std::string ErrMsg;
+    Module *M = NaClParseBitcodeFile(Buffer, Context, &ErrMsg);
+    if (M == 0)
+      Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
+                         ErrMsg);
+    // ParseBitcodeFile does not take ownership of the Buffer.
+    delete Buffer;
+    return M;
+  } else if (Format == LLVMFormat) {
+    if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
+                  (const unsigned char *)Buffer->getBufferEnd())) {
+      std::string ErrMsg;
+      Module *M = ParseBitcodeFile(Buffer, Context, &ErrMsg);
+      if (M == 0)
+        Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
+                           ErrMsg);
+      // ParseBitcodeFile does not take ownership of the Buffer.
+      delete Buffer;
+      return M;
+    }
+
+    return ParseAssembly(Buffer, 0, Err, Context);
+  } else {
+    Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
+                       "Did not specify correct format for file");
+    return 0;
+  }
+}
+
+Module *llvm::NaClParseIRFile(const std::string &Filename,
+                              NaClFileFormat Format,
+                              SMDiagnostic &Err,
+                              LLVMContext &Context) {
+  OwningPtr<MemoryBuffer> File;
+  if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename.c_str(), File)) {
+    Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
+                       "Could not open input file: " + ec.message());
+    return 0;
+  }
+
+  return NaClParseIR(File.take(), Format, Err, Context);
+}