[lldb] Make lldbVersion a full fledged library

Because of its dependency on clang (and potentially other compilers
downstream, such as swift) lldb_private::GetVersion already lives in its
own library called lldbBase. Despite that, its implementation was spread
across unrelated files. This patch improves things by introducing a
Version library with its own directory, header and implementation file.

The benefits of this patch include:

 - We can get rid of the ugly quoting macros.
 - Other parts of LLDB can read the version number from
   lldb/Version/Version.inc.
 - The implementation can be swapped out for tools like lldb-server than
   don't need to depend on clang at all.

Differential revision: https://reviews.llvm.org/D115211

lldb/include/lldb/Version/Version.h

@@ -0,0 +1,23 @@
+//===-- Version.h -----------------------------------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLDB_VERSION_VERSION_H
+#define LLDB_VERSION_VERSION_H
+
+#include <string>
+
+namespace lldb_private {
+
+/// Retrieves a string representing the complete LLDB version, which includes
+/// the lldb version number, as well as embedded compiler versions and the
+/// vendor tag.
+const char *GetVersion();
+
+} // namespace lldb_private
+
+#endif // LLDB_VERSION_VERSION_H

lldb/include/lldb/Version/Version.inc.in

@@ -0,0 +1,6 @@
+#define LLDB_VERSION @LLDB_VERSION@
+#define LLDB_VERSION_STRING "@LLDB_VERSION@"
+#define LLDB_VERSION_MAJOR @LLDB_VERSION_MAJOR@
+#define LLDB_VERSION_MINOR @LLDB_VERSION_MINOR@
+#define LLDB_VERSION_PATCHLEVEL @LLDB_VERSION_PATCHLEVEL@
+#cmakedefine LLDB_FULL_VERSION_STRING "@LLDB_FULL_VERSION_STRING@"

lldb/include/lldb/lldb-private.h

@@ -17,12 +17,6 @@
 #include "lldb/lldb-private-types.h"
 #include "lldb/lldb-public.h"
 
-namespace lldb_private {
-
-const char *GetVersion();
-
-} // namespace lldb_private
-
 #endif // defined(__cplusplus)
 
 #endif // LLDB_LLDB_PRIVATE_H

lldb/source/API/CMakeLists.txt

@@ -94,7 +94,6 @@ add_lldb_library(liblldb SHARED ${option_framework}
   ${lldb_lua_wrapper}
 
   LINK_LIBS
-    lldbBase
     lldbBreakpoint
     lldbCore
     lldbDataFormatters
@@ -105,6 +104,7 @@ add_lldb_library(liblldb SHARED ${option_framework}
     lldbSymbol
     lldbTarget
     lldbUtility
+    lldbVersion
     ${LLDB_ALL_PLUGINS}
   LINK_COMPONENTS
     Support

lldb/source/API/SBDebugger.cpp

@@ -11,8 +11,6 @@
 
 #include "lldb/API/SBDebugger.h"
 
-#include "lldb/lldb-private.h"
-
 #include "lldb/API/SBBroadcaster.h"
 #include "lldb/API/SBCommandInterpreter.h"
 #include "lldb/API/SBCommandInterpreterRunOptions.h"
@@ -52,6 +50,7 @@
 #include "lldb/Target/TargetList.h"
 #include "lldb/Utility/Args.h"
 #include "lldb/Utility/State.h"
+#include "lldb/Version/Version.h"
 
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringRef.h"

lldb/source/API/SBReproducer.cpp

@@ -23,7 +23,7 @@
 #include "lldb/API/SBHostOS.h"
 #include "lldb/API/SBReproducer.h"
 #include "lldb/Host/FileSystem.h"
-#include "lldb/lldb-private.h"
+#include "lldb/Version/Version.h"
 
 using namespace lldb;
 using namespace lldb_private;

lldb/source/CMakeLists.txt

@@ -1,41 +1,5 @@
-include_directories(.)
+include_directories(${CMAKE_CURRENT_SOURCE_DIR})
-
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
-set(lldbBase_SOURCES
-    lldb.cpp
-  )
-
-
-find_first_existing_vc_file("${LLDB_SOURCE_DIR}" lldb_vc)
-
-set(version_inc "${CMAKE_CURRENT_BINARY_DIR}/VCSVersion.inc")
-set(generate_vcs_version_script "${LLVM_CMAKE_DIR}/GenerateVersionFromVCS.cmake")
-
-if(lldb_vc AND LLVM_APPEND_VC_REV)
-  set(lldb_source_dir ${LLDB_SOURCE_DIR})
-endif()
-
-add_custom_command(OUTPUT "${version_inc}"
-  DEPENDS "${lldb_vc}" "${generate_vcs_version_script}"
-  COMMAND ${CMAKE_COMMAND} "-DNAMES=LLDB"
-                           "-DLLDB_SOURCE_DIR=${lldb_source_dir}"
-                           "-DHEADER_FILE=${version_inc}"
-                           -P "${generate_vcs_version_script}")
-
-# Mark the generated header as being generated.
-set_source_files_properties("${version_inc}"
-  PROPERTIES GENERATED TRUE
-             HEADER_FILE_ONLY TRUE)
-
-list(APPEND lldbBase_SOURCES ${version_inc})
-
-if(LLDB_VERSION_STRING)
-  set_property(SOURCE lldb.cpp APPEND PROPERTY
-               COMPILE_DEFINITIONS "LLDB_VERSION_STRING=${LLDB_VERSION_STRING}")
-endif()
-
-add_lldb_library(lldbBase
-  ${lldbBase_SOURCES}
-  )
 
 add_subdirectory(Breakpoint)
 add_subdirectory(Commands)
@@ -49,6 +13,7 @@ add_subdirectory(Plugins)
 add_subdirectory(Symbol)
 add_subdirectory(Target)
 add_subdirectory(Utility)
+add_subdirectory(Version)
 
 # Build API last.  Since liblldb needs to link against every other target, it needs
 # those targets to have already been created.

lldb/source/Commands/CMakeLists.txt

@@ -41,7 +41,6 @@ add_lldb_library(lldbCommands
   CommandOptionsProcessLaunch.cpp
 
   LINK_LIBS
-    lldbBase
     lldbBreakpoint
     lldbCore
     lldbDataFormatters
@@ -51,6 +50,7 @@ add_lldb_library(lldbCommands
     lldbSymbol
     lldbTarget
     lldbUtility
+    lldbVersion
 
   LINK_COMPONENTS
     Support

lldb/source/Commands/CommandObjectVersion.cpp

@@ -9,7 +9,7 @@
 #include "CommandObjectVersion.h"
 
 #include "lldb/Interpreter/CommandReturnObject.h"
-#include "lldb/lldb-private.h"
+#include "lldb/Version/Version.h"
 
 using namespace lldb;
 using namespace lldb_private;

lldb/source/Initialization/SystemInitializerCommon.cpp

@@ -15,7 +15,7 @@
 #include "lldb/Utility/Log.h"
 #include "lldb/Utility/ReproducerProvider.h"
 #include "lldb/Utility/Timer.h"
-#include "lldb/lldb-private.h"
+#include "lldb/Version/Version.h"
 
 #if defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__)
 #include "Plugins/Process/POSIX/ProcessPOSIXLog.h"

lldb/source/Version/CMakeLists.txt

@@ -0,0 +1,42 @@
+if(LLDB_VERSION_STRING)
+  set(LLDB_FULL_VERSION_STRING LLDB_VERSION_STRING)
+endif()
+
+# Configure the VCSVersion.inc file.
+set(vcs_version_inc "${CMAKE_CURRENT_BINARY_DIR}/VCSVersion.inc")
+set(generate_vcs_version_script "${LLVM_CMAKE_DIR}/GenerateVersionFromVCS.cmake")
+
+find_first_existing_vc_file("${LLDB_SOURCE_DIR}" lldb_vc)
+
+if(lldb_vc AND LLVM_APPEND_VC_REV)
+  set(lldb_source_dir ${LLDB_SOURCE_DIR})
+endif()
+
+add_custom_command(OUTPUT "${vcs_version_inc}"
+  DEPENDS "${lldb_vc}" "${generate_vcs_version_script}"
+  COMMAND ${CMAKE_COMMAND} "-DNAMES=LLDB"
+                           "-DLLDB_SOURCE_DIR=${lldb_source_dir}"
+                           "-DHEADER_FILE=${vcs_version_inc}"
+                           -P "${generate_vcs_version_script}")
+
+set_source_files_properties("${vcs_version_inc}"
+  PROPERTIES GENERATED TRUE
+             HEADER_FILE_ONLY TRUE)
+
+# Configure the Version.inc file.
+set(version_inc "${LLDB_BINARY_DIR}/include/lldb/Version/Version.inc")
+
+configure_file(
+  ${LLDB_SOURCE_DIR}/include/lldb/Version/Version.inc.in
+  ${version_inc})
+
+set_source_files_properties("${version_inc}"
+  PROPERTIES GENERATED TRUE
+             HEADER_FILE_ONLY TRUE)
+
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
+
+add_lldb_library(lldbVersion
+  Version.cpp
+  ${vcs_version_inc}
+  ${version_inc})

lldb/source/Version/Version.cpp

@@ -0,0 +1,73 @@
+//===-- Version.cpp -------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Version/Version.h"
+#include "VCSVersion.inc"
+#include "lldb/Version/Version.inc"
+#include "clang/Basic/Version.h"
+
+static const char *GetLLDBVersion() {
+#ifdef LLDB_FULL_VERSION_STRING
+  return LLDB_FULL_VERSION_STRING;
+#else
+  return "lldb version " CLANG_VERSION_STRING;
+#endif
+}
+
+static const char *GetLLDBRevision() {
+#ifdef LLDB_REVISION
+  return LLDB_REVISION;
+#else
+  return nullptr;
+#endif
+}
+
+static const char *GetLLDBRepository() {
+#ifdef LLDB_REPOSITORY
+  return LLDB_REPOSITORY;
+#else
+  return nullptr;
+#endif
+}
+
+const char *lldb_private::GetVersion() {
+  static std::string g_version_str;
+
+  if (g_version_str.empty()) {
+    const char *lldb_version = GetLLDBVersion();
+    const char *lldb_repo = GetLLDBRepository();
+    const char *lldb_rev = GetLLDBRevision();
+    g_version_str += lldb_version;
+    if (lldb_repo || lldb_rev) {
+      g_version_str += " (";
+      if (lldb_repo)
+        g_version_str += lldb_repo;
+      if (lldb_repo && lldb_rev)
+        g_version_str += " ";
+      if (lldb_rev) {
+        g_version_str += "revision ";
+        g_version_str += lldb_rev;
+      }
+      g_version_str += ")";
+    }
+
+    std::string clang_rev(clang::getClangRevision());
+    if (clang_rev.length() > 0) {
+      g_version_str += "\n  clang revision ";
+      g_version_str += clang_rev;
+    }
+
+    std::string llvm_rev(clang::getLLVMRevision());
+    if (llvm_rev.length() > 0) {
+      g_version_str += "\n  llvm revision ";
+      g_version_str += llvm_rev;
+    }
+  }
+
+  return g_version_str.c_str();
+}

lldb/tools/lldb-server/CMakeLists.txt

@@ -46,9 +46,9 @@ add_lldb_tool(lldb-server
     SystemInitializerLLGS.cpp
 
     LINK_LIBS
-      lldbBase
       lldbHost
       lldbInitialization
+      lldbVersion
       ${LLDB_PLUGINS}
       lldbPluginInstructionARM
       lldbPluginInstructionMIPS

lldb/tools/lldb-server/lldb-server.cpp

@@ -8,7 +8,7 @@
 
 #include "SystemInitializerLLGS.h"
 #include "lldb/Initialization/SystemLifetimeManager.h"
-#include "lldb/lldb-private.h"
+#include "lldb/Version/Version.h"
 
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringRef.h"

lldb/tools/lldb-test/CMakeLists.txt

@@ -6,7 +6,6 @@ add_lldb_tool(lldb-test
   SystemInitializerTest.cpp
 
   LINK_LIBS
-    lldbBase
     lldbBreakpoint
     lldbCore
     lldbDataFormatters
@@ -17,6 +16,7 @@ add_lldb_tool(lldb-test
     lldbSymbol
     lldbTarget
     lldbUtility
+    lldbVersion
     ${LLDB_ALL_PLUGINS}
 
   LINK_COMPONENTS