[LLDB] Move Trace-specific classes into separate library

[bulbazord]

Summary

These two classes, TraceSessionFileParser and ThreadPostMortemTrace,
seem to be useful primarily for tracing. Currently it looks like
intel-pt is the sole user of these, but that other tracing plugins could
be written in the future that take advantage of these. Unfortunately
with them in Target, there is a dependency on PluginProcessUtility. I'd
like to sever that dependency, so I moved them into a TraceCommon
plugin.

[wallace]

this looks good to me. Let's wait for Greg's opinion as well

[clayborg]

LGTM!

[bulbazord]

Updating

lldb/include/lldb/lldb-forward.h

 class ThreadPlanStepOverBreakpoint;
 class ThreadPlanStepRange;
 class ThreadPlanStepThrough;
 class ThreadPlanTracer;
 class ThreadSpec;
 class ThreadPostMortemTrace;
 class Trace;
 class TraceCursor;
-class TraceSessionFileParser;
 class Type;
 class TypeAndOrName;
 class TypeCategoryImpl;
 class TypeCategoryMap;
 class TypeEnumMemberImpl;
 class TypeEnumMemberListImpl;
 class TypeFilterImpl;
 class TypeFormatImpl;

lldb/source/Plugins/Trace/CMakeLists.txt

 option(LLDB_BUILD_INTEL_PT "Enable Building of Intel(R) Processor Trace Tool" OFF)
 
+add_subdirectory(common)
+
 if (LLDB_BUILD_INTEL_PT)
   add_subdirectory(intel-pt)
 endif()

lldb/source/Plugins/Trace/common/CMakeLists.txt

+add_lldb_library(lldbPluginTraceCommon
+  ThreadPostMortemTrace.cpp
+  TraceSessionFileParser.cpp
+
+  LINK_LIBS
+    lldbCore
+    lldbTarget
+  )

lldb/source/Plugins/Trace/common/ThreadPostMortemTrace.h

 //===-- ThreadPostMortemTrace.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_TARGET_THREADPOSTMORTEMTRACE_H
 #define LLDB_TARGET_THREADPOSTMORTEMTRACE_H
 
 #include "lldb/Target/Thread.h"
 
 namespace lldb_private {
 
 /// \class ThreadPostMortemTrace ThreadPostMortemTrace.h
 ///
 /// Thread implementation used for representing threads gotten from trace
 /// session files, which are similar to threads from core files.
 ///

lldb/source/Plugins/Trace/common/ThreadPostMortemTrace.cpp

 //===-- ThreadPostMortemTrace.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/Target/ThreadPostMortemTrace.h"
+#include "ThreadPostMortemTrace.h"
 
 #include <memory>
 
 #include "Plugins/Process/Utility/RegisterContextHistory.h"
 #include "lldb/Target/Process.h"
 #include "lldb/Target/RegisterContext.h"
 
 using namespace lldb;

lldb/source/Plugins/Trace/common/TraceSessionFileParser.h

 //===-- TraceSessionFileParser.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_TARGET_TRACESESSIONPARSER_H
 #define LLDB_TARGET_TRACESESSIONPARSER_H
 
 #include "llvm/Support/JSON.h"
 
-#include "lldb/Target/ThreadPostMortemTrace.h"
+#include "ThreadPostMortemTrace.h"
 
 namespace lldb_private {
 
 /// \class TraceSessionFileParser TraceSessionFileParser.h
 ///
 /// Base class for parsing the common information of JSON trace session files.
 /// Contains the basic C++ structs that represent the JSON data, which include
 /// \a JSONTraceSession as the root object.

lldb/source/Plugins/Trace/common/TraceSessionFileParser.cpp

 //===-- TraceSessionFileParser.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/Target/TraceSessionFileParser.h"
+#include "TraceSessionFileParser.h"
+#include "ThreadPostMortemTrace.h"
 
 #include <sstream>
 
 #include "lldb/Core/Debugger.h"
 #include "lldb/Core/Module.h"
 #include "lldb/Target/Process.h"
 #include "lldb/Target/Target.h"
-#include "lldb/Target/ThreadPostMortemTrace.h"
 
 using namespace lldb;
 using namespace lldb_private;
 using namespace llvm;
 
 void TraceSessionFileParser::NormalizePath(lldb_private::FileSpec &file_spec) {
   if (file_spec.IsRelative())
     file_spec.PrependPathComponent(m_session_file_dir);

lldb/source/Plugins/Trace/intel-pt/CMakeLists.txt

add_lldb_library(lldbPluginTraceIntelPT PLUGIN
   IntelPTDecoder.cpp
   TraceIntelPT.cpp
   TraceIntelPTSessionFileParser.cpp
 
   LINK_LIBS
     lldbCore
     lldbSymbol
     lldbTarget
+    lldbPluginTraceCommon
     ${LIBIPT_LIBRARY}
   LINK_COMPONENTS
     Support
   )
 
 
 add_dependencies(lldbPluginTraceIntelPT TraceIntelPTOptionsGen)

lldb/source/Target/CMakeLists.txt

add_lldb_library(lldbTarget
   ThreadPlanStepOverBreakpoint.cpp
   ThreadPlanStepOverRange.cpp
   ThreadPlanStepRange.cpp
   ThreadPlanStepThrough.cpp
   ThreadPlanStepUntil.cpp
   ThreadPlanTracer.cpp
   ThreadPlanStack.cpp
   ThreadSpec.cpp
-  ThreadPostMortemTrace.cpp
   Trace.cpp
   TraceCursor.cpp
-  TraceSessionFileParser.cpp
   UnixSignals.cpp
   UnwindAssembly.cpp
   UnwindLLDB.cpp
 
   LINK_LIBS
     lldbBreakpoint
     lldbCore
     lldbExpression

lldb/source/Target/Trace.cpp

 
 #include "lldb/Core/Module.h"
 #include "lldb/Core/PluginManager.h"
 #include "lldb/Symbol/Function.h"
 #include "lldb/Target/ExecutionContext.h"
 #include "lldb/Target/Process.h"
 #include "lldb/Target/SectionLoadList.h"
 #include "lldb/Target/Thread.h"
-#include "lldb/Target/ThreadPostMortemTrace.h"
 #include "lldb/Utility/Stream.h"
 
 using namespace lldb;
 using namespace lldb_private;
 using namespace llvm;
 
 // Helper structs used to extract the type of a trace session json without
 // having to parse the entire object.