Remove obsolete bitcode wrapper code

We are using our own bitcode reader now, and no longer need this.

R=jvoung@chromium.org, kschimpf@google.com
BUG=cleanup

Review URL: https://codereview.chromium.org/32943005

21 files changed, 2 insertions, 1121 deletions

diff --git a/include/llvm/Wrap/BCHeaderField.h b/include/llvm/Wrap/BCHeaderField.h
deleted file mode 100644
index 40a3714c9f..0000000000
--- a/include/llvm/Wrap/BCHeaderField.h
+++ /dev/null
@@ -1,106 +0,0 @@
-/* Copyright 2012 The Native Client Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can
- * be found in the LICENSE file.
- */
-
-#ifndef LLVM_WRAP_BCHEADERFIELD_H
-#define LLVM_WRAP_BCHEADERFIELD_H
-#include <limits>
-#include <stdint.h>
-#include <stdio.h>
-#include <string.h>
-
-// Class representing a variable-size metadata field in the bitcode header.
-// Also contains the list of known Tag IDs.
-// Contains a pointer to the data but does not own the data, so it can be
-// copied with the trivial copy constructor/assignment operator.
-
-// The serialized format has 2 fixed subfields (ID and length) and the
-// variable-length data subfield
-class BCHeaderField {
- public:
-  typedef enum {
-    kInvalid = 0,
-    kBitcodeHash = 1,
-    kAndroidCompilerVersion = 0x4001,
-    kAndroidOptimizationLevel = 0x4002
-  } Tag;
-  typedef uint16_t FixedSubfield;
-
-  BCHeaderField(Tag ID, size_t len, uint8_t* data) :
-      ID_(ID), len_(len), data_(data) {}
-  size_t GetTotalSize() {
-    // Round up to 4 byte alignment
-    return (kTagLenSize + len_ + 3) & ~3;
-  }
-
-  bool Write(uint8_t* buf, size_t buf_len) {
-    size_t fields_len = kTagLenSize + len_;
-    size_t pad_len = (4 - (fields_len & 3)) & 3;
-    // Ensure buffer is large enough and that length can be represented
-    // in 16 bits
-    if (buf_len < fields_len + pad_len ||
-        len_ > std::numeric_limits<FixedSubfield>::max()) return false;
-
-    WriteFixedSubfield(static_cast<FixedSubfield>(ID_), buf);
-    WriteFixedSubfield(static_cast<FixedSubfield>(len_),
-                       buf + sizeof(FixedSubfield));
-    memcpy(buf + kTagLenSize, data_, len_);
-    // Pad out to 4 byte alignment
-    if (pad_len) {
-      memset(buf + fields_len, 0, pad_len);
-    }
-    return true;
-  }
-
-  bool Read(const uint8_t* buf, size_t buf_len) {
-    if (buf_len < kTagLenSize) return false;
-    FixedSubfield field;
-    ReadFixedSubfield(&field, buf);
-    ID_ = static_cast<Tag>(field);
-    ReadFixedSubfield(&field, buf + sizeof(FixedSubfield));
-    len_ = static_cast<size_t>(field);
-    if (buf_len < kTagLenSize + len_) return false;
-    memcpy(data_, buf + kTagLenSize, len_);
-    return true;
-  }
-
-  void Print() {
-    fprintf(stderr, "Field ID: %d, data length %d, total length %d\n",
-            ID_, static_cast<int>(len_), static_cast<int>(GetTotalSize()));
-    fprintf(stderr, "Data: ");
-    for (size_t i = 0; i < len_; i++) fprintf(stderr, "%02x", data_[i]);
-    fprintf(stderr, "\n");
-  }
-
-  // Get the data size from a serialized field to allow allocation
-  static size_t GetDataSizeFromSerialized(const uint8_t* buf) {
-    FixedSubfield len;
-    ReadFixedSubfield(&len, buf + sizeof(FixedSubfield));
-    return len;
-  }
-
-  Tag getID() const {
-    return ID_;
-  }
-
-  size_t getLen() const {
-    return len_;
-  }
-
- private:
- // Combined size of the fixed subfields
- const static size_t kTagLenSize = 2 * sizeof(FixedSubfield);
-  static void WriteFixedSubfield(FixedSubfield value, uint8_t* buf) {
-    buf[0] = value & 0xFF;
-    buf[1] = (value >> 8) & 0xFF;
-  }
-  static void ReadFixedSubfield(FixedSubfield* value, const uint8_t* buf) {
-    *value = buf[0] | buf[1] << 8;
-  }
-  Tag ID_;
-  size_t len_;
-  uint8_t *data_;
-};
-
-#endif
diff --git a/include/llvm/Wrap/bitcode_wrapperer.h b/include/llvm/Wrap/bitcode_wrapperer.h
deleted file mode 100644
index 89f2a4cbcc..0000000000
--- a/include/llvm/Wrap/bitcode_wrapperer.h
+++ /dev/null
@@ -1,192 +0,0 @@
-/* Copyright 2012 The Native Client Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can
- * be found in the LICENSE file.
- */
-
-// Define utility class to wrap/unwrap bitcode files. Does wrapping/unwrapping
-// in such a way that the wrappered bitcode file is still a bitcode file.
-
-#ifndef LLVM_WRAP_BITCODE_WRAPPERER_H__
-#define LLVM_WRAP_BITCODE_WRAPPERER_H__
-
-#include <stdint.h>
-#include <stddef.h>
-#include <vector>
-
-#include "llvm/Support/support_macros.h"
-#include "llvm/Wrap/BCHeaderField.h"
-#include "llvm/Wrap/wrapper_input.h"
-#include "llvm/Wrap/wrapper_output.h"
-
-// The bitcode wrapper header is the following 7 fixed 4-byte fields:
-//      1) 0B17C0DE - The magic number expected by llvm for wrapped bitcodes
-//      2) Version # 0 - The current version of wrapped bitcode files
-//      3) (raw) bitcode offset
-//      4) (raw) bitcode size
-//      5) Android header version
-//      6) Android target API
-//      7) PNaCl Bitcode version
-//      plus 0 or more variable-length fields (consisting of ID, length, data)
-
-// Initial buffer size. It is expanded if needed to hold large variable-size
-// fields.
-static const size_t kBitcodeWrappererBufferSize = 1024;
-
-// Support class for outputting a wrapped bitcode file from a raw bitcode
-// file (and optionally additional header fields), or for outputting a raw
-// bitcode file from a wrapped one.
-class BitcodeWrapperer {
- public:
-  // Create a bitcode wrapperer using the following
-  // input and output files.
-  BitcodeWrapperer(WrapperInput* infile, WrapperOutput* outfile);
-
-  // Returns true if the input file begins with a bitcode
-  // wrapper magic number. As a side effect, _wrapper_ fields are set.
-  bool IsInputBitcodeWrapper();
-
-  // Returns true if the input file begins with a bitcode
-  // file magic number.
-  bool IsInputBitcodeFile();
-
-  // Add a variable-length field to the header. The caller is responsible
-  // for freeing the data pointed to by the BCHeaderField.
-  void AddHeaderField(BCHeaderField* field);
-
-  // Generate a wrapped bitcode file from the input bitcode file
-  // and the current header data. Return true on success.
-  bool GenerateWrappedBitcodeFile();
-
-  // Unwrap the wrapped bitcode file, to the corresponding
-  // outfile. Return true on success.
-  bool GenerateRawBitcodeFile();
-
-  // Print current wrapper header fields to stderr for debugging.
-  void PrintWrapperHeader();
-
-  ~BitcodeWrapperer();
-
- private:
-  DISALLOW_CLASS_COPY_AND_ASSIGN(BitcodeWrapperer);
-
-  // Refills the buffer with more bytes. Does this in a way
-  // such that it is maximally filled.
-  void FillBuffer();
-
-  // Returns the number of bytes in infile.
-  off_t GetInFileSize() {
-    if (infile_ != NULL) {
-      return infile_->Size();
-    } else {
-      return 0;
-    }
-  }
-
-  // Returns the offset of bitcode (i.e. the size of the wrapper header)
-  // if the output file were to be written now.
-  size_t BitcodeOffset();
-
-  // Returns true if we can read a word. If necessary, fills the buffer
-  // with enough characters so that there are at least a 32-bit value
-  // in the buffer. Returns false if there isn't a 32-bit value
-  // to read from the input file.
-  bool CanReadWord();
-
-  // Read a (32-bit) word from the input. Return true
-  // if able to read the word.
-  bool ReadWord(uint32_t& word);
-
-  // Write a (32-bit) word to the output. Return true if successful
-  bool WriteWord(uint32_t word);
-
-  // Write all variable-sized header fields to the output. Return true
-  // if successful.
-  bool WriteVariableFields();
-
-  // Parse the bitcode wrapper header in the infile, if any. Return true
-  // if successful.
-  bool ParseWrapperHeader();
-
-  // Returns the i-th character in front of the cursor in the buffer.
-  uint8_t BufferLookahead(int i) { return buffer_[cursor_ + i]; }
-
-  // Returns how many unread bytes are in the buffer.
-  size_t GetBufferUnreadBytes() { return buffer_size_ - cursor_; }
-
-
-  // Backs up the read cursor to the beginning of the input buffer.
-  void ResetCursor() {
-    cursor_ = 0;
-  }
-
-  // Generates the header sequence for the wrapped bitcode being
-  // generated.
-  bool WriteBitcodeWrapperHeader();
-
-  // Copies size bytes of infile to outfile, using the buffer.
-  bool BufferCopyInToOut(uint32_t size);
-
-  // Discards the old infile and replaces it with the given file.
-  void ReplaceInFile(WrapperInput* new_infile);
-
-  // Discards the old outfile and replaces it with the given file.
-  void ReplaceOutFile(WrapperOutput* new_outfile);
-
-  // Moves to the given position in the input file. Returns false
-  // if unsuccessful.
-  bool Seek(uint32_t pos);
-
-  // Clear the buffer of all contents.
-  void ClearBuffer();
-
-  // The input file being processed. Can be either
-  // a bitcode file, a wrappered bitcode file, or a secondary
-  // file to be wrapped.
-  WrapperInput* infile_;
-
-  // The output file being generated. Can be either
-  // a bitcode file, a wrappered bitcode file, or a secondary
-  // unwrapped file.
-  WrapperOutput* outfile_;
-
-  // A buffer of bytes read from the input file.
-  std::vector<uint8_t> buffer_;
-
-  // The number of bytes that were read from the input file
-  // into the buffer.
-  size_t buffer_size_;
-
-  // The index to the current read point within the buffer.
-  size_t cursor_;
-
-  // True when eof of input is reached.
-  bool infile_at_eof_;
-
-  // The 32-bit value defining the offset of the raw bitcode in the input file.
-  uint32_t infile_bc_offset_;
-
-  // The 32-bit value defining the generated offset of the wrapped bitcode.
-  // This value changes as new fields are added with AddHeaderField
-  uint32_t wrapper_bc_offset_;
-
-  // The 32-bit value defining the size of the raw wrapped bitcode.
-  uint32_t wrapper_bc_size_;
-
-  // Android header version and target API
-  uint32_t android_header_version_;
-  uint32_t android_target_api_;
-
-  // PNaCl bitcode version
-  uint32_t pnacl_bc_version_;
-
-  // Vector of variable header fields
-  std::vector<BCHeaderField> header_fields_;
-  // If any bufferdata from header fields is owned, it is stored here and
-  // freed on destruction.
-  std::vector<uint8_t*> variable_field_data_;
-
-  // True if there was an error condition (e.g. the file is not bitcode)
-  bool error_;
-};
-
-#endif  // LLVM_WRAP_BITCODE_WRAPPERER_H__
diff --git a/include/llvm/Wrap/file_wrapper_input.h b/include/llvm/Wrap/file_wrapper_input.h
deleted file mode 100644
index 9f3de004c4..0000000000
--- a/include/llvm/Wrap/file_wrapper_input.h
+++ /dev/null
@@ -1,48 +0,0 @@
-/* Copyright 2012 The Native Client Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can
- * be found in the LICENSE file.
- */
-
-// Defines utility allowing files for bitcode input wrapping.
-
-#ifndef FILE_WRAPPER_INPUT_H__
-#define FILE_WRAPPER_INPUT_H__
-
-#include "llvm/Support/support_macros.h"
-#include "llvm/Wrap/wrapper_input.h"
-
-#include <stdio.h>
-#include <string>
-
-// Define a class to wrap named files.
-class FileWrapperInput : public WrapperInput {
- public:
-  FileWrapperInput(const std::string& name);
-  ~FileWrapperInput();
-  // Tries to read the requested number of bytes into the buffer. Returns the
-  // actual number of bytes read.
-  virtual size_t Read(uint8_t* buffer, size_t wanted);
-  // Returns true if at end of file. Note: May return false
-  // until Read is called, and returns 0.
-  virtual bool AtEof();
-  // Returns the size of the file (in bytes).
-  virtual off_t Size();
-  // Moves to the given offset within the file. Returns
-  // false if unable to move to that position.
-  virtual bool Seek(uint32_t pos);
- private:
-  // The name of the file.
-  std::string _name;
-  // True once eof has been encountered.
-  bool _at_eof;
-  // True if size has been computed.
-  bool _size_found;
-  // The size of the file.
-  off_t _size;
-  // The corresponding (opened) file.
-  FILE* _file;
- private:
-  DISALLOW_CLASS_COPY_AND_ASSIGN(FileWrapperInput);
-};
-
-#endif // FILE_WRAPPER_INPUT_H__
diff --git a/include/llvm/Wrap/file_wrapper_output.h b/include/llvm/Wrap/file_wrapper_output.h
deleted file mode 100644
index 714bd36a75..0000000000
--- a/include/llvm/Wrap/file_wrapper_output.h
+++ /dev/null
@@ -1,34 +0,0 @@
-/* Copyright 2012 The Native Client Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can
- * be found in the LICENSE file.
- */
-
-// Defines utility allowing files for bitcode output wrapping.
-
-#ifndef FILE_WRAPPER_OUTPUT_H__
-#define FILE_WRAPPER_OUTPUT_H__
-
-#include "llvm/Support/support_macros.h"
-#include "llvm/Wrap/wrapper_output.h"
-#include <stdio.h>
-#include <string>
-
-// Define a class to wrap named files. */
-class FileWrapperOutput : public WrapperOutput {
- public:
-  FileWrapperOutput(const std::string& name);
-  ~FileWrapperOutput();
-  // Writes a single byte, returning false if unable to write.
-  virtual bool Write(uint8_t byte);
-  // Writes the specified number of bytes in the buffer to
-  // output. Returns false if unable to write.
-  virtual bool Write(const uint8_t* buffer, size_t buffer_size);
- private:
-  // The name of the file
-  std::string _name;
-  // The corresponding (opened) file.
-  FILE* _file;
- private:
-  DISALLOW_CLASS_COPY_AND_ASSIGN(FileWrapperOutput);
-};
-#endif  // FILE_WRAPPER_OUTPUT_H__
diff --git a/include/llvm/Wrap/wrapper_input.h b/include/llvm/Wrap/wrapper_input.h
deleted file mode 100644
index cde918083a..0000000000
--- a/include/llvm/Wrap/wrapper_input.h
+++ /dev/null
@@ -1,38 +0,0 @@
-/* Copyright 2012 The Native Client Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can
- * be found in the LICENSE file.
- */
-
-// Define a generic interface to a file/memory region that contains
-// a bitcode file, a wrapped bitcode file, or a data file to wrap.
-
-#ifndef LLVM_WRAP_WRAPPER_INPUT_H__
-#define LLVM_WRAP_WRAPPER_INPUT_H__
-
-#include <stdint.h>
-#include <sys/types.h>
-
-#include "llvm/Support/support_macros.h"
-
-// The following is a generic interface to a file/memory region that contains
-// a bitcode file, a wrapped bitcode file, or data file to wrap.
-class WrapperInput {
- public:
-  WrapperInput() {}
-  virtual ~WrapperInput() {}
-  // Tries to read the requested number of bytes into the buffer. Returns the
-  // actual number of bytes read.
-  virtual size_t Read(uint8_t* buffer, size_t wanted) = 0;
-  // Returns true if at end of input. Note: May return false until
-  // Read is called, and returns 0.
-  virtual bool AtEof() = 0;
-  // Returns the size of the input (in bytes).
-  virtual off_t Size() = 0;
-  // Moves to the given offset within the input region. Returns false
-  // if unable to move to that position.
-  virtual bool Seek(uint32_t pos) = 0;
- private:
-  DISALLOW_CLASS_COPY_AND_ASSIGN(WrapperInput);
-};
-
-#endif  // LLVM_WRAP_WRAPPER_INPUT_H__
diff --git a/include/llvm/Wrap/wrapper_output.h b/include/llvm/Wrap/wrapper_output.h
deleted file mode 100644
index 7045705991..0000000000
--- a/include/llvm/Wrap/wrapper_output.h
+++ /dev/null
@@ -1,34 +0,0 @@
-/* Copyright 2012 The Native Client Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can
- * be found in the LICENSE file.
- */
-
-// Defines a generic interface to a file/memory region that
-// contains a generated wrapped bitcode file, bitcode file,
-// or data file.
-
-#ifndef LLVM_WRAP_WRAPPER_OUTPUT_H__
-#define LLVM_WRAP_WRAPPER_OUTPUT_H__
-
-#include <stdint.h>
-#include <stddef.h>
-
-#include "llvm/Support/support_macros.h"
-
-// The following is a generic interface to a file/memory region
-// that contains a generated bitcode file, wrapped bitcode file,
-// or a data file.
-class WrapperOutput {
- public:
-  WrapperOutput() {}
-  virtual ~WrapperOutput() {}
-  // Writes a single byte, returning false if unable to write.
-  virtual bool Write(uint8_t byte) = 0;
-  // Writes the specified number of bytes in the buffer to
-  // output. Returns false if unable to write.
-  virtual bool Write(const uint8_t* buffer, size_t buffer_size);
- private:
-  DISALLOW_CLASS_COPY_AND_ASSIGN(WrapperOutput);
-};
-
-#endif  // LLVM_WRAP_WRAPPER_OUTPUT_H__
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index e2a5c54756..76ebe9aca9 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -15,4 +15,3 @@ add_subdirectory(ExecutionEngine)
 add_subdirectory(Target)
 add_subdirectory(AsmParser)
 add_subdirectory(Archive)
-add_subdirectory(Wrap)
diff --git a/lib/Makefile b/lib/Makefile
index ac9050db7c..3a699adc8d 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -11,7 +11,7 @@ LEVEL = ..
 include $(LEVEL)/Makefile.config
 
 PARALLEL_DIRS := IR IRReader AsmParser Bitcode Archive Analysis Transforms CodeGen \
-                Target ExecutionEngine Linker MC Object Option Wrap DebugInfo
+                Target ExecutionEngine Linker MC Object Option DebugInfo
 
 ifeq ($(NACL_SANDBOX),1)
   PARALLEL_DIRS := $(filter-out Archive Linker, \
diff --git a/lib/Wrap/CMakeLists.txt b/lib/Wrap/CMakeLists.txt
deleted file mode 100644
index da44a6bb56..0000000000
--- a/lib/Wrap/CMakeLists.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-add_llvm_library(LLVMWrap
-  bitcode_wrapperer.cpp
-  file_wrapper_input.cpp
-  file_wrapper_output.cpp
-  wrapper_output.cpp
-)
\ No newline at end of file
diff --git a/lib/Wrap/LLVMBuild.txt b/lib/Wrap/LLVMBuild.txt
deleted file mode 100644
index 8750711338..0000000000
--- a/lib/Wrap/LLVMBuild.txt
+++ /dev/null
@@ -1,21 +0,0 @@
-;===- ./lib/Wrap/LLVMBuild.txt ------------------------------*- Conf -*--===;
-;
-;                     The LLVM Compiler Infrastructure
-;
-; This file is distributed under the University of Illinois Open Source
-; License. See LICENSE.TXT for details.
-;
-;===------------------------------------------------------------------------===;
-;
-; This is an LLVMBuild description file for the components in this subdirectory.
-;
-; For more information on the LLVMBuild system, please see:
-;
-;   http://llvm.org/docs/LLVMBuild.html
-;
-;===------------------------------------------------------------------------===;
-
-[component_0]
-type = Library
-name = Wrap
-parent = Libraries
diff --git a/lib/Wrap/Makefile b/lib/Wrap/Makefile
deleted file mode 100644
index 79aa2b3531..0000000000
--- a/lib/Wrap/Makefile
+++ /dev/null
@@ -1,14 +0,0 @@
-##===- lib/Linker/Makefile ---------------------------------*- Makefile -*-===##
-#
-#                     The LLVM Compiler Infrastructure
-#
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
-#
-##===----------------------------------------------------------------------===##
-
-LEVEL = ../..
-LIBRARYNAME = LLVMWrap
-BUILD_ARCHIVE := 1
-
-include $(LEVEL)/Makefile.common
diff --git a/lib/Wrap/bitcode_wrapperer.cpp b/lib/Wrap/bitcode_wrapperer.cpp
deleted file mode 100644
index eeb2825793..0000000000
--- a/lib/Wrap/bitcode_wrapperer.cpp
+++ /dev/null
@@ -1,355 +0,0 @@
-/* Copyright 2012 The Native Client Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can
- * be found in the LICENSE file.
- */
-
-#include "llvm/Wrap/bitcode_wrapperer.h"
-
-#include <stdio.h>
-#include <sys/stat.h>
-
-using std::vector;
-
-// The number of bytes in a 32 bit integer.
-static const uint32_t kWordSize = 4;
-
-// Number of LLVM-defined fixed fields in the header.
-static const uint32_t kLLVMFields = 4;
-
-// Total number of fixed fields in the header.
-static const uint32_t kFixedFields = 7;
-
-// The magic number that must exist for bitcode wrappers.
-static const uint32_t kWrapperMagicNumber = 0x0B17C0DE;
-
-// The version number associated with a wrapper file.
-// Note: llvm currently only allows the value 0. When this changes,
-// we should consider making this a command line option.
-static const uint32_t kLLVMVersionNumber = 0;
-
-// Fields defined by Android bitcode header.
-static const uint32_t kAndroidHeaderVersion = 0;
-static const uint32_t kAndroidTargetAPI = 0;
-static const uint32_t kAndroidDefaultCompilerVersion = 0;
-static const uint32_t kAndroidDefaultOptimizationLevel = 3;
-
-// PNaCl bitcode version number.
-static const uint32_t kPnaclBitcodeVersion = 0;
-
-// Max size for variable fields. Currently only used for writing them
-// out to files (the parsing works for arbitrary sizes).
-static const size_t kMaxVariableFieldSize = 256;
-
-BitcodeWrapperer::BitcodeWrapperer(WrapperInput* infile, WrapperOutput* outfile)
-    : infile_(infile),
-      outfile_(outfile),
-      buffer_size_(0),
-      cursor_(0),
-      infile_at_eof_(false),
-      infile_bc_offset_(0),
-      wrapper_bc_offset_(0),
-      wrapper_bc_size_(0),
-      android_header_version_(kAndroidHeaderVersion),
-      android_target_api_(kAndroidTargetAPI),
-      pnacl_bc_version_(0),
-      error_(false) {
-  buffer_.resize(kBitcodeWrappererBufferSize);
-  if (IsInputBitcodeWrapper()) {
-    ParseWrapperHeader();
-  } else if (IsInputBitcodeFile()) {
-    wrapper_bc_offset_ = kWordSize * kFixedFields;
-    wrapper_bc_size_ = GetInFileSize();
-  } else {
-    fprintf(stderr, "Error: input file is not a bitcode file.\n");
-    error_ = true;
-  }
-}
-
-BitcodeWrapperer::~BitcodeWrapperer() {
-  for(size_t i = 0; i < variable_field_data_.size(); i++) {
-    delete [] variable_field_data_[i];
-  }
-}
-
-
-void BitcodeWrapperer::ClearBuffer() {
-  buffer_size_ = 0;
-  cursor_ = 0;
-  infile_at_eof_ = false;
-}
-
-bool BitcodeWrapperer::Seek(uint32_t pos) {
-  if (infile_ != NULL && infile_->Seek(pos)) {
-    ClearBuffer();
-    return true;
-  }
-  return false;
-}
-
-bool BitcodeWrapperer::CanReadWord() {
-  if (GetBufferUnreadBytes() < kWordSize) {
-    FillBuffer();
-    return GetBufferUnreadBytes() >= kWordSize;
-  } else {
-    return true;
-  }
-}
-
-void BitcodeWrapperer::FillBuffer() {
-  if (cursor_ > 0) {
-    // Before filling, move any remaining bytes to the
-    // front of the buffer. This allows us to assume
-    // that after the call to FillBuffer, readable
-    // text is contiguous.
-    if (cursor_ < buffer_size_) {
-      size_t i = 0;
-      while (cursor_ < buffer_size_) {
-        buffer_[i++] = buffer_[cursor_++];
-      }
-      cursor_ = 0;
-      buffer_size_ = i;
-    }
-  } else {
-    // Assume the buffer contents have been used,
-    // and we want to completely refill it.
-    buffer_size_ = 0;
-  }
-
-  // If we don't have an input, we can't refill the buffer at all.
-  if (infile_ == NULL) {
-    return;
-  }
-
-  // Now fill in remaining space.
-  size_t needed = buffer_.size() - buffer_size_;
-
-  while (buffer_.size() > buffer_size_) {
-    int actually_read = infile_->Read(&buffer_[buffer_size_], needed);
-    if (infile_->AtEof()) {
-      infile_at_eof_ = true;
-    }
-    if (actually_read) {
-      buffer_size_ += actually_read;
-      needed -= actually_read;
-    } else if (infile_at_eof_) {
-      break;
-    }
-  }
-}
-
-bool BitcodeWrapperer::ReadWord(uint32_t& word) {
-  if (!CanReadWord()) return false;
-  word = (((uint32_t) BufferLookahead(0)) << 0)
-      | (((uint32_t) BufferLookahead(1)) << 8)
-      | (((uint32_t) BufferLookahead(2)) << 16)
-      | (((uint32_t) BufferLookahead(3)) << 24);
-  cursor_ += kWordSize;
-  return true;
-}
-
-bool BitcodeWrapperer::WriteWord(uint32_t value) {
-  uint8_t buffer[kWordSize];
-  buffer[3] = (value >> 24) & 0xFF;
-  buffer[2] = (value >> 16) & 0xFF;
-  buffer[1] = (value >> 8)  & 0xFF;
-  buffer[0] = (value >> 0)  & 0xFF;
-  return outfile_->Write(buffer, kWordSize);
-}
-
-bool BitcodeWrapperer::WriteVariableFields() {
-  // This buffer may have to be bigger if we start using the fields
-  // for larger things.
-  uint8_t buffer[kMaxVariableFieldSize];
-  for (vector<BCHeaderField>::iterator it = header_fields_.begin();
-       it != header_fields_.end(); ++it) {
-    if (!it->Write(buffer, kMaxVariableFieldSize) ||
-        !outfile_->Write(buffer, it->GetTotalSize())) {
-      return false;
-    }
-  }
-  return true;
-}
-
-bool BitcodeWrapperer::ParseWrapperHeader() {
-  // Make sure LLVM-defined fields have been parsed
-  if (!IsInputBitcodeWrapper()) return false;
-  // Check the android/pnacl fields
-  if (!ReadWord(android_header_version_) ||
-      !ReadWord(android_target_api_) || !ReadWord(pnacl_bc_version_)) {
-    fprintf(stderr, "Error: file not long enough to contain header\n");
-    return false;
-  }
-  if (pnacl_bc_version_ != kPnaclBitcodeVersion) {
-    fprintf(stderr, "Error: bad PNaCl Bitcode version\n");
-    return false;
-  }
-  int field_data_total = wrapper_bc_offset_ - kWordSize * kFixedFields;
-  if (field_data_total > 0) {
-    // Read in the variable fields. We need to allocate space for the data.
-    int field_data_read = 0;
-
-    while (field_data_read < field_data_total) {
-      FillBuffer();
-      size_t buffer_needed = BCHeaderField::GetDataSizeFromSerialized(
-          &buffer_[cursor_]);
-      if (buffer_needed > buffer_.size()) {
-        buffer_.resize(buffer_needed +
-                       sizeof(BCHeaderField::FixedSubfield) * 2);
-        FillBuffer();
-      }
-      variable_field_data_.push_back(new uint8_t[buffer_needed]);
-
-      BCHeaderField field(BCHeaderField::kInvalid, 0,
-                          variable_field_data_.back());
-      field.Read(&buffer_[cursor_], buffer_size_);
-      header_fields_.push_back(field);
-      size_t field_size = field.GetTotalSize();
-      cursor_ += field_size;
-      field_data_read += field_size;
-      if (field_data_read > field_data_total) {
-        // We read too much data, the header is corrupted
-        fprintf(stderr, "Error: raw bitcode offset inconsistent with "
-                "variable field data\n");
-        return false;
-      }
-    }
-    Seek(0);
-  }
-  return true;
-}
-
-bool BitcodeWrapperer::IsInputBitcodeWrapper() {
-  ResetCursor();
-  // First make sure that there are enough words (LLVM header)
-  // to peek at.
-  if (GetBufferUnreadBytes() < kLLVMFields * kWordSize) {
-    FillBuffer();
-    if (GetBufferUnreadBytes() < kLLVMFields * kWordSize) return false;
-  }
-
-  // Now make sure the magic number is right.
-  uint32_t first_word;
-  if ((!ReadWord(first_word)) ||
-      (kWrapperMagicNumber != first_word)) return false;
-
-  // Make sure the version is right.
-  uint32_t second_word;
-  if ((!ReadWord(second_word)) ||
-      (kLLVMVersionNumber != second_word)) return false;
-
-  // Make sure that the offset and size (for llvm) is defined.
-  uint32_t bc_offset;
-  uint32_t bc_size;
-  if (ReadWord(bc_offset) &&
-      ReadWord(bc_size)) {
-    // Before returning, save the extracted values.
-    wrapper_bc_offset_ = bc_offset;
-    infile_bc_offset_ = bc_offset;
-    wrapper_bc_size_ = bc_size;
-    return true;
-  }
-  // If reached, unable to read wrapped header.
-  return false;
-}
-
-bool BitcodeWrapperer::IsInputBitcodeFile() {
-  ResetCursor();
-  // First make sure that there are four bytes to peek at.
-  if (GetBufferUnreadBytes() < kWordSize) {
-    FillBuffer();
-    if (GetBufferUnreadBytes() < kWordSize) return false;
-  }
-  // If reached, Check if first 4 bytes match bitcode
-  // file magic number.
-  return (BufferLookahead(0) == 'B') &&
-      (BufferLookahead(1) == 'C') &&
-      (BufferLookahead(2) == 0xc0) &&
-      (BufferLookahead(3) == 0xde);
-}
-
-bool BitcodeWrapperer::BufferCopyInToOut(uint32_t size) {
-  while (size > 0) {
-    // Be sure buffer is non-empty before writing.
-    if (0 == buffer_size_) {
-      FillBuffer();
-      if (0 == buffer_size_) {
-        return false;
-      }
-    }
-    // copy the buffer to the output file.
-    size_t block = (buffer_size_ < size) ? buffer_size_ : size;
-    if (!outfile_->Write(&buffer_[cursor_], block)) return false;
-    size -= block;
-    buffer_size_ = 0;
-  }
-  // Be sure that there isn't more bytes on the input stream.
-  FillBuffer();
-  return buffer_size_ == 0;
-}
-
-void BitcodeWrapperer::AddHeaderField(BCHeaderField* field) {
-  vector<BCHeaderField>::iterator it = header_fields_.begin();
-  for (; it != header_fields_.end(); ++it) {
-    // If this field is the same as an existing one, overwrite it.
-    if (it->getID() == field->getID()) {
-      wrapper_bc_offset_ += (field->GetTotalSize() - it->GetTotalSize());
-      *it = *field;
-      break;
-    }
-  }
-  if (it == header_fields_.end()) { // there was no match, add a new field
-    header_fields_.push_back(*field);
-    wrapper_bc_offset_ += field->GetTotalSize();
-  }
-}
-
-bool BitcodeWrapperer::WriteBitcodeWrapperHeader() {
-  return
-      // Note: This writes out the 4 word header required by llvm wrapped
-      // bitcode.
-      WriteWord(kWrapperMagicNumber) &&
-      WriteWord(kLLVMVersionNumber) &&
-      WriteWord(wrapper_bc_offset_) &&
-      WriteWord(wrapper_bc_size_) &&
-      // 2 fixed fields defined by Android
-      WriteWord(android_header_version_) &&
-      WriteWord(android_target_api_) &&
-      // PNaClBitcode version
-      WriteWord(kPnaclBitcodeVersion) &&
-      // Common variable-length fields
-      WriteVariableFields();
-}
-
-void BitcodeWrapperer::PrintWrapperHeader() {
-  if (error_) {
-    fprintf(stderr, "Error condition exists: the following"
-            "data may not be reliable\n");
-  }
-  fprintf(stderr, "Wrapper magic:\t\t%x\n", kWrapperMagicNumber);
-  fprintf(stderr, "LLVM Bitcode version:\t%d\n", kLLVMVersionNumber);
-  fprintf(stderr, "Raw bitcode offset:\t%d\n", wrapper_bc_offset_);
-  fprintf(stderr, "Raw bitcode size:\t%d\n", wrapper_bc_size_);
-  fprintf(stderr, "Android header version:\t%d\n", android_header_version_);
-  fprintf(stderr, "Android target API:\t%d\n", android_target_api_);
-  fprintf(stderr, "PNaCl bitcode version:\t%d\n", kPnaclBitcodeVersion);
-  for (size_t i = 0; i < header_fields_.size(