[Bitcode] Move Bitstream to a separate library

This moves Bitcode/Bitstream*, Bitcode/BitCodes.h to Bitstream/.

This is needed to avoid a circular dependency when using the bitstream
code for parsing optimization remarks.

Since Bitcode uses Core for the IR part:

libLLVMRemarks -> Bitcode -> Core

and Core uses libLLVMRemarks to generate remarks (see
IR/RemarkStreamer.cpp):

Core -> libLLVMRemarks

we need to separate the Bitstream and Bitcode part.

For clang-doc, it seems that it doesn't need the whole bitcode layer, so
I updated the CMake to only use the bitstream part.

Differential Revision: https://reviews.llvm.org/D63899

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@365091 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Bitcode/BitcodeReader.h

@@ -15,7 +15,7 @@
 
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/StringRef.h"
-#include "llvm/Bitcode/BitCodes.h"
+#include "llvm/Bitstream/BitCodes.h"
 #include "llvm/IR/ModuleSummaryIndex.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/Error.h"

include/llvm/Bitcode/LLVMBitCodes.h

@@ -17,7 +17,7 @@
 #ifndef LLVM_BITCODE_LLVMBITCODES_H
 #define LLVM_BITCODE_LLVMBITCODES_H
 
-#include "llvm/Bitcode/BitCodes.h"
+#include "llvm/Bitstream/BitCodes.h"
 
 namespace llvm {
 namespace bitc {

include/llvm/Bitstream/BitCodes.h

@@ -1,4 +1,4 @@
-//===- BitCodes.h - Enum values for the bitcode format ----------*- C++ -*-===//
+//===- BitCodes.h - Enum values for the bitstream format --------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This header Bitcode enum values.
+// This header defines bitstream 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
@@ -14,8 +14,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_BITCODE_BITCODES_H
-#define LLVM_BITCODE_BITCODES_H
+#ifndef LLVM_BITSTREAM_BITCODES_H
+#define LLVM_BITSTREAM_BITCODES_H
 
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Support/DataTypes.h"
@@ -23,7 +23,7 @@
 #include <cassert>
 
 namespace llvm {
-/// Offsets of the 32-bit fields of bitcode wrapper header.
+/// Offsets of the 32-bit fields of bitstream wrapper header.
 static const unsigned BWH_MagicField = 0 * 4;
 static const unsigned BWH_VersionField = 1 * 4;
 static const unsigned BWH_OffsetField = 2 * 4;

include/llvm/Bitstream/BitstreamReader.h

@@ -11,12 +11,12 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_BITCODE_BITSTREAMREADER_H
-#define LLVM_BITCODE_BITSTREAMREADER_H
+#ifndef LLVM_BITSTREAM_BITSTREAMREADER_H
+#define LLVM_BITSTREAM_BITSTREAMREADER_H
 
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/SmallVector.h"
-#include "llvm/Bitcode/BitCodes.h"
+#include "llvm/Bitstream/BitCodes.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/MathExtras.h"
@@ -550,4 +550,4 @@ public:
 
 } // end llvm namespace
 
-#endif // LLVM_BITCODE_BITSTREAMREADER_H
+#endif // LLVM_BITSTREAM_BITSTREAMREADER_H

include/llvm/Bitstream/BitstreamWriter.h

@@ -11,14 +11,14 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_BITCODE_BITSTREAMWRITER_H
-#define LLVM_BITCODE_BITSTREAMWRITER_H
+#ifndef LLVM_BITSTREAM_BITSTREAMWRITER_H
+#define LLVM_BITSTREAM_BITSTREAMWRITER_H
 
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
-#include "llvm/Bitcode/BitCodes.h"
+#include "llvm/Bitstream/BitCodes.h"
 #include "llvm/Support/Endian.h"
 #include <vector>
 

include/llvm/Support/JSON.h

@@ -39,7 +39,7 @@
 ///
 /// - LLVM bitstream is a space- and CPU- efficient binary format. Typically it
 ///   encodes LLVM IR ("bitcode"), but it can be a container for other data.
-///   Low-level reader/writer libraries are in Bitcode/Bitstream*.h
+///   Low-level reader/writer libraries are in Bitstream/Bitstream*.h
 ///
 //===---------------------------------------------------------------------===//
 

lib/Bitcode/Reader/BitcodeReader.cpp

@@ -20,7 +20,7 @@
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/ADT/Twine.h"
-#include "llvm/Bitcode/BitstreamReader.h"
+#include "llvm/Bitstream/BitstreamReader.h"
 #include "llvm/Bitcode/LLVMBitCodes.h"
 #include "llvm/Config/llvm-config.h"
 #include "llvm/IR/Argument.h"

lib/Bitcode/Reader/CMakeLists.txt

@@ -1,7 +1,6 @@
 add_llvm_library(LLVMBitReader
   BitReader.cpp
   BitcodeReader.cpp
-  BitstreamReader.cpp
   MetadataLoader.cpp
   ValueList.cpp
 

lib/Bitcode/Reader/LLVMBuild.txt

@@ -18,4 +18,4 @@
 type = Library
 name = BitReader
 parent = Bitcode
-required_libraries = Core Support
+required_libraries = BitstreamReader Core Support

lib/Bitcode/Reader/MetadataLoader.cpp

@@ -22,7 +22,7 @@
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Bitcode/BitcodeReader.h"
-#include "llvm/Bitcode/BitstreamReader.h"
+#include "llvm/Bitstream/BitstreamReader.h"
 #include "llvm/Bitcode/LLVMBitCodes.h"
 #include "llvm/IR/Argument.h"
 #include "llvm/IR/Attributes.h"

lib/Bitcode/Writer/BitcodeWriter.cpp

@@ -24,8 +24,8 @@
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/Triple.h"
-#include "llvm/Bitcode/BitCodes.h"
-#include "llvm/Bitcode/BitstreamWriter.h"
+#include "llvm/Bitstream/BitCodes.h"
+#include "llvm/Bitstream/BitstreamWriter.h"
 #include "llvm/Bitcode/LLVMBitCodes.h"
 #include "llvm/Config/llvm-config.h"
 #include "llvm/IR/Attributes.h"

lib/Bitstream/CMakeLists.txt

@@ -0,0 +1,2 @@
+add_subdirectory(Reader)
+# The writer is header-only.

lib/Bitstream/LLVMBuild.txt

@@ -0,0 +1,23 @@
+;===- ./lib/Bitstream/LLVMBuild.txt ----------------------------*- Conf -*--===;
+;
+; Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+; See https://llvm.org/LICENSE.txt for license information.
+; SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+;
+;===------------------------------------------------------------------------===;
+;
+; 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
+;
+;===------------------------------------------------------------------------===;
+
+[common]
+subdirectories = Reader
+
+[component_0]
+type = Group
+name = Bitstream
+parent = Libraries

lib/Bitstream/Reader/BitstreamReader.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Bitcode/BitstreamReader.h"
+#include "llvm/Bitstream/BitstreamReader.h"
 #include "llvm/ADT/StringRef.h"
 #include <cassert>
 #include <string>

lib/Bitstream/Reader/CMakeLists.txt

@@ -0,0 +1,7 @@
+add_llvm_library(LLVMBitstreamReader
+  BitstreamReader.cpp
+
+  ADDITIONAL_HEADER_DIRS
+  ${LLVM_MAIN_INCLUDE_DIR}/llvm/Bitcode
+  ${LLVM_MAIN_INCLUDE_DIR}/llvm/Bitstream
+  )

lib/Bitstream/Reader/LLVMBuild.txt

@@ -0,0 +1,21 @@
+;===- ./lib/Bitstream/Reader/LLVMBuild.txt ---------------------*- Conf -*--===;
+;
+; Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+; See https://llvm.org/LICENSE.txt for license information.
+; SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+;
+;===------------------------------------------------------------------------===;
+;
+; 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 = BitstreamReader
+parent = Bitstream
+required_libraries = Support

lib/CMakeLists.txt

@@ -7,6 +7,7 @@ add_subdirectory(IRReader)
 add_subdirectory(CodeGen)
 add_subdirectory(BinaryFormat)
 add_subdirectory(Bitcode)
+add_subdirectory(Bitstream)
 add_subdirectory(Transforms)
 add_subdirectory(Linker)
 add_subdirectory(Analysis)

lib/LLVMBuild.txt

@@ -19,6 +19,7 @@ subdirectories =
  Analysis
  AsmParser
  Bitcode
+ Bitstream
  CodeGen
  DebugInfo
  Demangle

tools/llvm-bcanalyzer/CMakeLists.txt

@@ -1,5 +1,6 @@
 set(LLVM_LINK_COMPONENTS
   BitReader
+  BitstreamReader
   Support
   )
 

tools/llvm-bcanalyzer/LLVMBuild.txt

@@ -18,4 +18,4 @@
 type = Tool
 name = llvm-bcanalyzer
 parent = Tools
-required_libraries = BitReader
+required_libraries = BitReader BitstreamReader Support

tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp

@@ -28,7 +28,7 @@
 
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Bitcode/BitcodeReader.h"
-#include "llvm/Bitcode/BitstreamReader.h"
+#include "llvm/Bitstream/BitstreamReader.h"
 #include "llvm/Bitcode/LLVMBitCodes.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Format.h"

unittests/Bitcode/CMakeLists.txt

@@ -8,6 +8,4 @@ set(LLVM_LINK_COMPONENTS
 
 add_llvm_unittest(BitcodeTests
   BitReaderTest.cpp
-  BitstreamReaderTest.cpp
-  BitstreamWriterTest.cpp
   )

unittests/Bitstream/BitstreamReaderTest.cpp

@@ -6,9 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Bitcode/BitstreamReader.h"
+#include "llvm/Bitstream/BitstreamReader.h"
 #include "llvm/ADT/STLExtras.h"
-#include "llvm/Bitcode/BitstreamWriter.h"
+#include "llvm/Bitstream/BitstreamWriter.h"
 #include "gtest/gtest.h"
 
 using namespace llvm;

unittests/Bitstream/BitstreamWriterTest.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Bitcode/BitstreamWriter.h"
+#include "llvm/Bitstream/BitstreamWriter.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallString.h"
 #include "gtest/gtest.h"

unittests/Bitstream/CMakeLists.txt

@@ -0,0 +1,8 @@
+set(LLVM_LINK_COMPONENTS
+  BitstreamReader
+  )
+
+add_llvm_unittest(BitstreamTests
+  BitstreamReaderTest.cpp
+  BitstreamWriterTest.cpp
+  )

unittests/CMakeLists.txt

@@ -13,6 +13,7 @@ add_subdirectory(Analysis)
 add_subdirectory(AsmParser)
 add_subdirectory(BinaryFormat)
 add_subdirectory(Bitcode)
+add_subdirectory(Bitstream)
 add_subdirectory(CodeGen)
 add_subdirectory(DebugInfo)
 add_subdirectory(Demangle)

utils/GenLibDeps.pl

@@ -96,6 +96,8 @@ if ($PEROBJ) {
     $libpath =~ s/^AsmPrinter/CodeGen\/AsmPrinter/;
     $libpath =~ s/^BitReader/Bitcode\/Reader/;
     $libpath =~ s/^BitWriter/Bitcode\/Writer/;
+    $libpath =~ s/^BitstreamReader/Bitstream\/Reader/;
+    $libpath =~ s/^BitstreamWriter/Bitstream\/Writer/;
     $libpath =~ s/^MSIL/Target\/MSIL/;
     $libpath =~ s/^Core/IR/;
     $libpath =~ s/^Instrumentation/Transforms\/Instrumentation/;
@@ -136,6 +138,8 @@ if ($PEROBJ) {
     $libpath =~ s/^AsmPrinter/CodeGen\/AsmPrinter/;
     $libpath =~ s/^BitReader/Bitcode\/Reader/;
     $libpath =~ s/^BitWriter/Bitcode\/Writer/;
+    $libpath =~ s/^BitstreamReader/Bitstream\/Reader/;
+    $libpath =~ s/^BitstreamWriter/Bitstream\/Writer/;
     $libpath =~ s/^MSIL/Target\/MSIL/;
     $libpath =~ s/^Core/VMCore/;
     $libpath =~ s/^Instrumentation/Transforms\/Instrumentation/;