Copy LLVM bitcode reader to generate a PNaCl wire format reader.

include/llvm/Bitcode/NaCl/NaClBitstreamReader.h

Index: include/llvm/Bitcode/NaCl/NaClBitstreamReader.h
diff --git a/include/llvm/Bitcode/BitstreamReader.h b/include/llvm/Bitcode/NaCl/NaClBitstreamReader.h
similarity index 83%
copy from include/llvm/Bitcode/BitstreamReader.h
copy to include/llvm/Bitcode/NaCl/NaClBitstreamReader.h
index 2d2976cde13ca867b8a1344c25979a0569203ffa..238ce5275a1668f899cf496ca6718673844c6c82 100644
--- a/include/llvm/Bitcode/BitstreamReader.h
+++ b/include/llvm/Bitcode/NaCl/NaClBitstreamReader.h
@@ -1,4 +1,5 @@
-//===- BitstreamReader.h - Low-level bitstream reader interface -*- C++ -*-===//
+//===- NaClBitstreamReader.h -----------------------------------*- C++ -*-===//
+//     Low-level bitstream reader interface
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -12,11 +13,11 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_BITCODE_BITSTREAMREADER_H
-#define LLVM_BITCODE_BITSTREAMREADER_H
+#ifndef LLVM_BITCODE_NACL_NACLBITSTREAMREADER_H
+#define LLVM_BITCODE_NACL_NACLBITSTREAMREADER_H
 
 #include "llvm/ADT/OwningPtr.h"
-#include "llvm/Bitcode/BitCodes.h"
+#include "llvm/Bitcode/NaCl/NaClLLVMBitCodes.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/StreamableMemoryObject.h"
 #include <climits>
@@ -27,12 +28,12 @@ namespace llvm {
 
   class Deserializer;
 
-/// BitstreamReader - This class is used to read from an LLVM bitcode stream,
-/// maintaining information that is global to decoding the entire file.  While
-/// a file is being read, multiple cursors can be independently advanced or
-/// skipped around within the file.  These are represented by the
-/// BitstreamCursor class.
-class BitstreamReader {
+/// NaClBitstreamReader - This class is used to read from a NaCl
+/// bitcode wire format stream, maintaining information that is global
+/// to decoding the entire file.  While a file is being read, multiple
+/// cursors can be independently advanced or skipped around within the
+/// file.  These are represented by the NaClBitstreamCursor class.
+class NaClBitstreamReader {
 public:
   /// BlockInfo - This contains information emitted to BLOCKINFO_BLOCK blocks.
   /// These describe abbreviations that all blocks of the specified ID inherit.
@@ -53,18 +54,18 @@ private:
   /// uses this.
   bool IgnoreBlockInfoNames;
 
-  BitstreamReader(const BitstreamReader&) LLVM_DELETED_FUNCTION;
-  void operator=(const BitstreamReader&) LLVM_DELETED_FUNCTION;
+  NaClBitstreamReader(const NaClBitstreamReader&) LLVM_DELETED_FUNCTION;
+  void operator=(const NaClBitstreamReader&) LLVM_DELETED_FUNCTION;
 public:
-  BitstreamReader() : IgnoreBlockInfoNames(true) {
+  NaClBitstreamReader() : IgnoreBlockInfoNames(true) {
   }
 
-  BitstreamReader(const unsigned char *Start, const unsigned char *End) {
+  NaClBitstreamReader(const unsigned char *Start, const unsigned char *End) {
     IgnoreBlockInfoNames = true;
     init(Start, End);
   }
 
-  BitstreamReader(StreamableMemoryObject *bytes) {
+  NaClBitstreamReader(StreamableMemoryObject *bytes) {
     BitcodeBytes.reset(bytes);
   }
 
@@ -75,7 +76,7 @@ public:
 
   StreamableMemoryObject &getBitcodeBytes() { return *BitcodeBytes; }
 
-  ~BitstreamReader() {
+  ~NaClBitstreamReader() {
     // Free the BlockInfoRecords.
     while (!BlockInfoRecords.empty()) {
       BlockInfo &Info = BlockInfoRecords.back();
@@ -127,15 +128,15 @@ public:
 };
 
   
-/// BitstreamEntry - When advancing through a bitstream cursor, each advance can
-/// discover a few different kinds of entries:
+/// NaClBitstreamEntry - When advancing through a bitstream cursor,
+/// each advance can discover a few different kinds of entries:
 ///   Error    - Malformed bitcode was found.
 ///   EndBlock - We've reached the end of the current block, (or the end of the
 ///              file, which is treated like a series of EndBlock records.
 ///   SubBlock - This is the start of a new subblock of a specific ID.
 ///   Record   - This is a record with a specific AbbrevID.
 ///
-struct BitstreamEntry {
+struct NaClBitstreamEntry {
   enum {
     Error,
     EndBlock,
@@ -145,29 +146,29 @@ struct BitstreamEntry {
   
   unsigned ID;
 
-  static BitstreamEntry getError() {
-    BitstreamEntry E; E.Kind = Error; return E;
+  static NaClBitstreamEntry getError() {
+    NaClBitstreamEntry E; E.Kind = Error; return E;
   }
-  static BitstreamEntry getEndBlock() {
-    BitstreamEntry E; E.Kind = EndBlock; return E;
+  static NaClBitstreamEntry getEndBlock() {
+    NaClBitstreamEntry E; E.Kind = EndBlock; return E;
   }
-  static BitstreamEntry getSubBlock(unsigned ID) {
-    BitstreamEntry E; E.Kind = SubBlock; E.ID = ID; return E;
+  static NaClBitstreamEntry getSubBlock(unsigned ID) {
+    NaClBitstreamEntry E; E.Kind = SubBlock; E.ID = ID; return E;
   }
-  static BitstreamEntry getRecord(unsigned AbbrevID) {
-    BitstreamEntry E; E.Kind = Record; E.ID = AbbrevID; return E;
+  static NaClBitstreamEntry getRecord(unsigned AbbrevID) {
+    NaClBitstreamEntry E; E.Kind = Record; E.ID = AbbrevID; return E;
   }
 };
 
-/// BitstreamCursor - This represents a position within a bitcode file.  There
-/// may be multiple independent cursors reading within one bitstream, each
-/// maintaining their own local state.
+/// NaClBitstreamCursor - This represents a position within a bitcode
+/// file.  There may be multiple independent cursors reading within
+/// one bitstream, each maintaining their own local state.
 ///
-/// Unlike iterators, BitstreamCursors are heavy-weight objects that should not
-/// be passed by value.
-class BitstreamCursor {
+/// Unlike iterators, NaClBitstreamCursors are heavy-weight objects
+/// that should not be passed by value.
+class NaClBitstreamCursor {
   friend class Deserializer;
-  BitstreamReader *BitStream;
+  NaClBitstreamReader *BitStream;
   size_t NextChar;
 
   
@@ -201,20 +202,21 @@ class BitstreamCursor {
 
   
 public:
-  BitstreamCursor() : BitStream(0), NextChar(0) {
+  NaClBitstreamCursor() : BitStream(0), NextChar(0) {
   }
-  BitstreamCursor(const BitstreamCursor &RHS) : BitStream(0), NextChar(0) {
+  NaClBitstreamCursor(const NaClBitstreamCursor &RHS)
+      : BitStream(0), NextChar(0) {
     operator=(RHS);
   }
 
-  explicit BitstreamCursor(BitstreamReader &R) : BitStream(&R) {
+  explicit NaClBitstreamCursor(NaClBitstreamReader &R) : BitStream(&R) {
     NextChar = 0;
     CurWord = 0;
     BitsInCurWord = 0;
     CurCodeSize = 2;
   }
 
-  void init(BitstreamReader &R) {
+  void init(NaClBitstreamReader &R) {
     freeState();
 
     BitStream = &R;
@@ -224,11 +226,11 @@ public:
     CurCodeSize = 2;
   }
 
-  ~BitstreamCursor() {
+  ~NaClBitstreamCursor() {
     freeState();
   }
 
-  void operator=(const BitstreamCursor &RHS);
+  void operator=(const NaClBitstreamCursor &RHS);
 
   void freeState();
   
@@ -260,10 +262,10 @@ public:
     return NextChar*CHAR_BIT - BitsInCurWord;
   }
 
-  BitstreamReader *getBitStreamReader() {
+  NaClBitstreamReader *getBitStreamReader() {
     return BitStream;
   }
-  const BitstreamReader *getBitStreamReader() const {
+  const NaClBitstreamReader *getBitStreamReader() const {
     return BitStream;
   }
 
@@ -281,18 +283,18 @@ public:
   
   /// advance - Advance the current bitstream, returning the next entry in the
   /// stream.
-  BitstreamEntry advance(unsigned Flags = 0) {
+  NaClBitstreamEntry advance(unsigned Flags = 0) {
     while (1) {
       unsigned Code = ReadCode();
       if (Code == bitc::END_BLOCK) {
         // Pop the end of the block unless Flags tells us not to.
         if (!(Flags & AF_DontPopBlockAtEnd) && ReadBlockEnd())
-          return BitstreamEntry::getError();
-        return BitstreamEntry::getEndBlock();
+          return NaClBitstreamEntry::getError();
+        return NaClBitstreamEntry::getEndBlock();
       }
       
       if (Code == bitc::ENTER_SUBBLOCK)
-        return BitstreamEntry::getSubBlock(ReadSubBlockID());
+        return NaClBitstreamEntry::getSubBlock(ReadSubBlockID());
       
       if (Code == bitc::DEFINE_ABBREV &&
           !(Flags & AF_DontAutoprocessAbbrevs)) {
@@ -302,22 +304,22 @@ public:
         continue;
       }
 
-      return BitstreamEntry::getRecord(Code);
+      return NaClBitstreamEntry::getRecord(Code);
     }
   }
 
   /// advanceSkippingSubblocks - This is a convenience function for clients that
   /// don't expect any subblocks.  This just skips over them automatically.
-  BitstreamEntry advanceSkippingSubblocks(unsigned Flags = 0) {
+  NaClBitstreamEntry advanceSkippingSubblocks(unsigned Flags = 0) {
     while (1) {
       // If we found a normal entry, return it.
-      BitstreamEntry Entry = advance(Flags);
-      if (Entry.Kind != BitstreamEntry::SubBlock)
+      NaClBitstreamEntry Entry = advance(Flags);
+      if (Entry.Kind != NaClBitstreamEntry::SubBlock)
         return Entry;
       
       // If we found a sub-block, just skip over it and check the next entry.
       if (SkipBlock())
-        return BitstreamEntry::getError();
+        return NaClBitstreamEntry::getError();
     }
   }