UnrealEngineUWP/Engine/Source/Developer/Windows/LiveCodingServer/Private/External/LC_LiveModule.h

// Copyright 2011-2019 Molecular Matters GmbH, all rights reserved.

#pragma once

#include "CoreTypes.h"
#include "LC_CoffCache.h"
#include "LC_ModuleCache.h"
#include "LC_Symbols.h"
#include "LC_Process.h"
#include "LC_Commands.h"
#include "LC_Executable.h"
#include "LC_Semaphore.h"
#include "LC_RunMode.h"


class DuplexPipe;
class FileAttributeCache;
class DirectoryCache;
class ModulePatch;
class LiveProcess;

class LiveModule
{
public:
	struct PerProcessData
	{
		LiveProcess* liveProcess;
		void* originalModuleBase;
		std::wstring modulePath;
	};

	struct ErrorType
	{
		enum Enum
		{
			NO_CHANGE,
			COMPILE_ERROR,
			LINK_ERROR,
			LOAD_PATCH_ERROR,
			ACTIVATE_PATCH_ERROR,
			SUCCESS
		};
	};

	struct UpdateType
	{
		enum Enum
		{
			DEFAULT,
			NO_CLIENT_COMMUNICATION
		};
	};

	struct CompileResult
	{
		unsigned int exitCode;
		bool wasCompiled;
	};

	LiveModule(const wchar_t* moduleName, const executable::Header& imageHeader, RunMode::Enum runMode);
	~LiveModule(void);

	void Load(symbols::Provider* provider, symbols::DiaCompilandDB* diaCompilandDb);

	// unloads all patches that have been loaded into all processes so far
	void Unload(void);

	void RegisterProcess(LiveProcess* liveProcess, void* moduleBase, const std::wstring& modulePath);
	void UnregisterProcess(LiveProcess* liveProcess);

	void DisableControlFlowGuard(LiveProcess* liveProcess, void* moduleBase);

	void UpdateDirectoryCache(DirectoryCache* cache);

	// builds a patch for this module according to changed files.
	// in DEFAULT mode, this checks for file modifications, compiles files automatically, builds a patch containing changes, and loads them into the host application.
	// in EXTERNAL_BUILD_SYSTEM mode, this does not compile files but builds a patch containing modified .objs, loading the patch into the host application.
	// optionally, an array of modified or new .objs can be given in this mode, which builds a patch containing these files, not checking for any other modifications.
	ErrorType::Enum Update(FileAttributeCache* fileCache, DirectoryCache* directoryCache, UpdateType::Enum updateType, const std::vector<std::wstring>& modifiedOrNewObjFiles);
	bool InstallCompiledPatches(LiveProcess* liveProcess, void* originalModuleBase);

	const std::wstring& GetModuleName(void) const;
	const executable::Header& GetImageHeader(void) const;

	const symbols::CompilandDB* GetCompilandDatabase(void) const;
	const symbols::LinkerDB* GetLinkerDatabase(void) const;

	bool HasInstalledPatches(void) const;

private:
	void UpdateDirectoryCache(const ImmutableString& path, symbols::Dependency* dependency, DirectoryCache* cache);

	void OnCompiledFile(const symbols::ObjPath& objPath, symbols::Compiland* compiland, const CompileResult& compileResult, double compileTime, bool forceAmalgamationPartsLinkage);

	// actions
	struct LoadPatchInfoAction
	{
		typedef commands::LoadPatchInfo CommandType;
		static bool Execute(CommandType* command, const DuplexPipe* pipe, void* context);
	};

	std::wstring m_moduleName;
	executable::Header m_imageHeader;
	RunMode::Enum m_runMode;
	size_t m_mainModuleToken = 0u;

	// data that stores which processes loaded this module at which address originally
	types::vector<PerProcessData> m_perProcessData;

	// caches
	CoffCache<coff::CoffDB>* m_coffCache = nullptr;
	ModuleCache* m_moduleCache = nullptr;
	types::StringSet m_reconstructedCompilands;

	// main databases
	symbols::SymbolDB* m_symbolDB = nullptr;
	symbols::ContributionDB* m_contributionDB = nullptr;
	symbols::CompilandDB* m_compilandDB = nullptr;
	symbols::LibraryDB* m_libraryDB = nullptr;
	symbols::LinkerDB* m_linkerDB = nullptr;
	symbols::ThunkDB* m_thunkDB = nullptr;
	symbols::ImageSectionDB* m_imageSectionDB = nullptr;
	types::StringMap<types::vector<const symbols::Symbol*>> m_externalSymbolsPerCompilandCache;
	types::StringMap<ImmutableString> m_pchSymbolToCompilandName;
	types::vector<ImmutableString> m_weakSymbolsInLibs;

	// patch data
	types::unordered_map<unsigned int, types::unordered_set<const void*>> m_patchedAddressesPerProcess;
	unsigned int m_patchCounter = 0u;

	// data pertaining to the next patch
	types::StringSet m_modifiedFiles;
	types::StringMap<symbols::Compiland*> m_compiledCompilands;

	// all patches loaded so far along with recorded data how to load them into other processes
	types::vector<ModulePatch*> m_compiledModulePatches;
};