Define the content-independent interfaces to read/write bitcode files and

the high-level interface to read/write LLVM IR bitcode files.

This is a work in progress.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36329 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Bitcode/BitCodes.h

@@ -0,0 +1,46 @@
+//===- BitCodes.h - Enum values for the bitcode format ----------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Chris Lattner and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This header Bitcode enum values.
+//
+// The enum values defined in this file should be considered permanent.  If
+// new features are added, they should have values added at the end of the
+// respective lists.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_BITCODE_BITCODES_H
+#define LLVM_BITCODE_BITCODES_H
+
+namespace llvm {
+namespace bitc {
+  enum StandardWidths {
+    BlockIDWidth = 8,  // We use VBR-8 for block IDs.
+    CodeLenWidth = 4,  // Codelen are VBR-4.
+    BlockSizeWidth = 32  // BlockSize up to 2^32 32-bit words = 32GB per block.
+  };
+  
+  // The standard code namespace always has a way to exit a block, enter a
+  // nested block, define abbrevs, and define an unabbreviated record.
+  enum FixedCodes {
+    END_BLOCK = 0,  // Must be zero to guarantee termination for broken bitcode.
+    ENTER_SUBBLOCK = 1,
+    
+    // Two codes are reserved for defining abbrevs and for emitting an
+    // unabbreviated record.
+    DEFINE_ABBREVS = 2,
+    UNABBREV_RECORD = 3,
+    
+    // This is not a code, this is a marker for the first abbrev assignment.
+    FIRST_ABBREV = 4
+  };
+} // End bitc namespace
+} // End llvm namespace
+
+#endif